CN103359232B - Electric vehicle - Google Patents

Abstract

The invention provides a kind of electric vehicle that can realize cost cutting and productivity ratio raising with the supporting structure of battery that drives by improvement. Be supported in the electric vehicle of vehicle frame (16) at battery module (77) from electric power to drive motor that supply with, vehicle frame (16) possesses from forming its anterior head tube (21) to the main frame (22) of back lower place extension, the afterframe (24) that is configured in Qie Xiang back upper place, the rear extension of this main frame (22), the front connector member (23) that the leading section of afterframe (24) is connected with the rearward end of main frame (22), is supported with battery module (77) in the left and right of afterframe (24).

Description

electric vehicle

technical field

The present invention relates to an electric vehicle including a body frame that can be transferred between different models, and a battery that supplies electric power to a driving motor is supported on the body frame.

Background technique

In an electric vehicle, especially an electric motorcycle, in order to efficiently arrange a drive battery in a vehicle body, the shape of the frame and the arrangement of the battery are generally changed according to the type of electric motorcycle. As such electric vehicles, for example, electric vehicles disclosed in Patent Document 1 and Patent Document 2 are known.

The electric motorcycle of Patent Document 1 is a model in which the main frame constituting the frame extends rearward and downward from the head pipe, and a power unit is arranged below the main frame (so-called naked type, etc.). A battery frame is mounted via a power unit, and a driving battery is provided on the battery frame.

The electric two-wheeled vehicle of Patent Document 2 is a model (so-called scooter type) that is provided with a floor pedal for the driver to put his feet on. Support cases are provided on the left and right sides of the rear frame arranged under the seat. The case houses the driving batteries, respectively.

【Prior technical literature】

【Patent Literature】

[Patent Document 1] Japanese Patent No. 3152392

[Patent Document 2] Japanese Patent No. 3050422

【Summary of Invention】

【Problems to be solved by the invention】

As shown in Patent Document 1 and Patent Document 2, when the supporting structure of the driving battery is set for each model of electric vehicle, it becomes a dedicated design for each model, and further improvement is required in terms of cost and productivity.

Contents of the invention

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric vehicle capable of achieving cost reduction and productivity improvement by improving a support structure for a driving battery.

【Means used to solve the problem】

In order to solve the above problems, the present invention relates to an electric vehicle in which batteries 77 , 101 , 115 for supplying electric power to drive motors 13 , 134 are supported on frames 16 , 156 . The electric vehicle is characterized in that the frame 16 , 156 includes main frames 22, 182 extending rearward and downward from the head pipes 21, 181 constituting the front portion, a rear frame 24 arranged behind the main frames 22, 182 and extending rearward and upward, and the rear frame Joint members 23 , 183 , whose front ends are connected to rear ends of the main frames 22 , 182 , support the batteries 77 , 101 , 115 on the left and right sides of the rear frame 24 .

According to this configuration, even when the electric vehicle models are different, the combination of the main frame and the rear frame can be changed by changing the joint member, so that various changes can be made, and cost reduction and productivity improvement can be realized.

In the above configuration, the battery 77, 101 may be supported by the rear frame 24 via a battery support member 76 provided with a plurality of fixing parts for supporting the battery 77, 101. The fixing parts 87 and 88 are installed in such a manner that the installation position can be changed with respect to the battery supporting member 76, and the fixing parts 87 and 88 can be connected with the batteries 77, 101 is supported correspondingly. According to this structure, since a plurality of fixing parts are provided, it is possible to support by fixing parts corresponding to a plurality of types of batteries having different shapes, and it is not necessary to prepare battery supporting members corresponding to a plurality of types of batteries, and the number of parts is reduced, thereby Cost reduction and productivity improvement can be realized.

In addition, in the above configuration, the batteries 77 and 101 may be arranged obliquely such that the longitudinal direction thereof becomes lower at the front and higher at the rear. According to this configuration, since the battery is arranged approximately along the rear frame extending rearward and upward, the space on both sides of the rear frame can be efficiently used, the overall length of the battery can be increased, and the battery capacity can be increased in a limited space. .

In addition, in the above configuration, the battery supporting member 76 may support the battery 115 through the bracket 112 attached to the fixing parts 87 and 88 . According to this configuration, by using the bracket, more types of batteries can be supported by the same battery supporting member.

In addition, in the above configuration, the rear frame 24 may also serve as a seat frame for supporting the seats 18 and 158 . Since the rear frame supporting the battery is also used as the seat frame, there is no need to provide a seat frame in particular, and the number of parts is reduced, thereby enabling cost reduction and productivity improvement.

In addition, in the above configuration, the joint member 23, 183 may support the swing arm 31 on which the wheels 14, 154. According to this configuration, since the joint member connecting the main frame and the rear frame also serves as a support member for the swing arm, it is not necessary to provide a support member for the swing arm in particular, and cost reduction and productivity improvement can be achieved.

In addition, in the above structure, the battery 77, 101 may be accommodated in the battery case 32, and the battery case 32 is composed of the battery supporting member 76 mounted on the rear frame 24 and the The side of the battery support member 76 is covered by the cover member 75 . According to this structure, by accommodating the battery in the battery case, the battery can be protected from flying stones, dust, rain, and the like. Furthermore, the battery can be easily maintained by removing the cover member from the battery supporting member.

In addition, a power drive unit 20 for controlling the drive motors 13 , 134 may be disposed below the rear ends of the main frames 22 , 182 and below the joint members 23 , 183 . According to this configuration, the PDU 20 can be arranged in this motorcycle in the space where the engine, the pivot plate supporting the pivot, etc. Wheel space.

In addition, in the above configuration, a power drive unit 188 for controlling the drive motors 13 and 134 may be arranged on the bottom surface of the battery case 32 and above the swing arm 31 . According to this configuration, the power drive unit can be arranged by effectively utilizing the space formed between the battery case and the swing arm. Moreover, by preventing the sand, gravel or muddy water splashed from the road surface through the swing arm, the power drive unit can be protected from contact with the sand, gravel or muddy water splashed from the road surface.

In addition, in the above configuration, the battery case 32 may overlap a part of the wheel 14 in a side view, and the wheel 14 may move up and down between the left and right battery cases 32 . According to this configuration, even if the left and right battery cases are enlarged, there is no interference with the wheels, and thus a large battery can be accommodated in the battery case.

In addition, in the above configuration, the battery case 32 may be covered from the outside in the vehicle width direction by a battery protection frame 33 attached to the rear frame 24, and the battery protection frame 33 also serves as a support seat 18. seat frame. According to this configuration, the battery case and the battery can be protected by covering the battery case and the battery from the side with the battery protection frame, and there is no need to provide a seat frame in particular, and the number of parts can be reduced, thereby achieving cost reduction and productivity improvement. .

In addition, in the above configuration, the joint member 23 , 183 may include a pivot shaft 28 extending in the vehicle width direction, and the swing arm 31 may be vertically swingably supported by the pivot shaft 28 . According to this configuration, the conventional pair of left and right pivot frames for supporting the pivot is unnecessary, and the joint member also serves as the pivot frame. Therefore, the number of components can be reduced, and cost reduction and productivity improvement can be achieved.

【Invention effect】

In the present invention, the vehicle frame includes a main frame extending rearward and downward from a head pipe constituting the front portion, a rear frame disposed behind the main frame and extending rearward and upward, and connecting the front end of the rear frame to the rear of the main frame. The joint members connected at the ends support the batteries on the left and right sides of the rear frame. Therefore, even if the models of the electric vehicles are different, the combination of the main frame and the rear frame can be changed by changing the joint members, so that the combination of the main frame and the rear frame can be changed. Corresponding to various changes, cost reduction and productivity improvement can be realized.

In addition, the battery is supported on the rear frame via a battery supporting member provided with a plurality of fixing parts for supporting the battery, and the fixing parts are attached so as to be able to change the mounting position with respect to the battery supporting member. The part can be supported corresponding to a plurality of types of batteries with different shapes. Therefore, through a plurality of fixing parts, the fixing parts corresponding to a plurality of types of batteries with different shapes can be used to support the battery. Correspondingly, the battery supporting members are prepared separately, and the number of components is reduced, thereby achieving cost reduction and productivity improvement.

In addition, the battery is arranged obliquely so that its longitudinal direction becomes low at the front and high at the rear. Therefore, the battery is arranged approximately along the rear frame extending rearward and upward. Therefore, the space on both sides of the rear frame can be efficiently used, and the The full length of the battery can increase the battery capacity in a limited space.

In addition, since the battery support member supports the battery through the bracket attached to the fixing portion, by using the bracket, it is possible to support more types of batteries by the same battery support member.

In addition, since the rear frame also serves as a seat frame for supporting the seat, there is no need to provide a seat frame in particular, and the number of parts can be reduced, resulting in cost reduction and productivity improvement.

In addition, the joint member supports the swing arm to swing freely up and down, and the wheel driven by the driving motor is mounted on the swing arm. Therefore, the joint member connecting the main frame and the rear frame can also be used as a support member for the swing arm, and no special adjustment is required. The support member of the swing arm can be provided efficiently, so that cost reduction and productivity improvement can be realized.

In addition, the battery is accommodated in a battery case composed of a battery support member attached to the rear frame and a cover member covering the sides of the battery support member, so that the battery can be protected from flying stones, dust, Effects of rain, etc. Furthermore, the battery can be easily maintained by removing the cover member from the battery supporting member.

In addition, the power drive unit for controlling the driving motor is disposed below the rear end of the main frame and below the joint member, so the space below the rear end of the main frame and below the joint member can be effectively used. .

In addition, the power drive unit for controlling the driving motor is disposed above the swing arm on the bottom surface of the battery case, so the power drive unit can be disposed by effectively utilizing the space formed between the battery case and the swing arm. Moreover, by preventing the sand, gravel or muddy water splashed from the road surface through the swing arm, the power drive unit can be protected from contact with the sand, gravel or muddy water splashed from the road surface.

In addition, the battery case overlaps a part of the wheel in a side view, and the wheel moves up and down between the left and right battery cases. Therefore, even if the left and right battery cases are enlarged, they do not interfere with the wheels. A large battery is accommodated in the case.

In addition, the battery case is covered from the outside in the vehicle width direction by a battery protection frame attached to the rear frame. This battery protection frame also serves as a seat frame for supporting the seat, so the battery case can be covered from the side by the battery protection frame. and the battery, the battery case and the battery are protected, and there is no need to provide a seat frame in particular, the number of parts can be reduced, and cost reduction and productivity improvement can be achieved.

In addition, since the joint member has a pivot extending in the vehicle width direction, and the swing arm is vertically supported on the pivot, there is no need for a conventional pair of left and right pivot frames for supporting the pivot. Since the joint member also serves as the pivot frame, the number of parts can be reduced, resulting in cost reduction and productivity improvement.

Description of drawings

FIG. 1 is a perspective view showing a motorcycle to which a first embodiment of the present invention is applied.

Fig. 2 is a left side view showing the motorcycle with the body cover removed.

Fig. 3 is a left side view showing main parts of the motorcycle.

Fig. 4 is a perspective view of main parts of the motorcycle viewed from the lower left.

Fig. 5 is a perspective view showing main parts of the motorcycle.

Fig. 6 is a perspective view showing a state in which the battery protection frame and the battery case are removed from Fig. 5 .

FIG. 7 is an explanatory view showing an assembled state of the battery module.

Fig. 8 is an explanatory diagram showing a base plate attached to the rear frame.

Fig. 9 is a perspective view showing a front joint member.

Fig. 10 is a perspective view showing a rear joint member.

FIG. 11 is an explanatory diagram illustrating a battery module.

Fig. 12 is a side view showing the arrangement of the second embodiment of the battery module.

13 is a perspective view showing a third embodiment of a driving battery and a battery case.

FIG. 14 is an explanatory diagram illustrating a battery case and a driving battery.

Fig. 15 is a side view of main parts showing a fourth embodiment of the motorcycle.

Fig. 16 is a main part side view showing a fifth embodiment of the motorcycle.

Fig. 17 is a perspective view showing a sixth embodiment of the motorcycle.

Fig. 18 is a left side view showing the motorcycle with the body cover removed.

Fig. 19 is a perspective view showing a front joint member.

Fig. 20 is a perspective view showing a seventh embodiment of the motorcycle.

Fig. 21 is a left side view showing main parts of the motorcycle with the body cover removed.

Fig. 22 is a main part left side view showing an eighth embodiment of the motorcycle.

【Symbol Description】

10, 130, 140, 150, 190, 200 motorized two-wheel vehicles (electric vehicles)

13. 134 motor (drive motor)

14, 154 rear wheels (wheels)

16, 156, 192 frame

18, 158 seats

20. 188 power drive unit, PDU

21, 181 head tube

22, 182 main frame

23, 183 front joint member (joint member)

24, 196 rear frame

28 pivot

31 swing arm

32 battery case

33 battery protection frame

75 shell cover (cover member)

76, 211 base plate (battery support member)

77, 101 battery module (battery)

87 first nut (fixed part)

88 second nut (fixed part)

112 battery support bracket (bracket)

115 driving battery (battery)

detailed description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that in the description, descriptions of directions such as front, rear, left, right, and up and down are the same as directions relative to the vehicle body, unless otherwise specified. In addition, the symbol FR shown in each drawing represents the front of the vehicle body, the symbol UP represents the upper side of the vehicle body, and the symbol LE represents the left side of the vehicle body.

<First Embodiment>

FIG. 1 is a perspective view showing a motorcycle 10 to which a first embodiment of the present invention is applied.

The motorcycle 10 is an electric vehicle with front wheels 12 steered by handlebars 11 at the front of the vehicle body and rear wheels 14 driven by an electric motor 13 at the rear of the vehicle body. The vehicle frame 16 is covered by a vehicle body cover 17. A seat 18 is mounted on the rear upper part. Reference numeral 20 denotes a power drive unit (hereinafter referred to as “PDU” (PowerDrive Unit)) provided under the vehicle frame 16, which is connected to a drive battery (not shown) to control the drive of the motor 13 .

FIG. 2 is a left side view showing the motorcycle 10 with the body cover removed.

The motorcycle 10 includes a body frame 16 as a skeleton. The frame 16 includes a head pipe 21 provided at the front end thereof, a main frame 22 extending obliquely downward rearward from the head pipe 21 , and a rear frame 24 attached to the rear end of the main frame 22 via a front joint member 23 . .

Specifically, the motorcycle 10 includes: a front fork 26 steerably attached to the head pipe 21; a front wheel 12 attached to the lower end of the front fork 26 via an axle 27; the handlebar 11; the swing arm 31 mounted on the front joint member 23 freely swinging up and down via the pivot 28; the motor 13 mounted on the rear end of the swing arm 31; the rear wheel 14 driven by the motor 13; The battery cases 32, 32 (only the symbol 32 on the front side are shown) are installed on the left and right side parts of the rear frame 24 in order to accommodate the driving battery for supplying electric power to the motor 13; in order to protect the battery case from the side 32,32 inside the drive battery and installed on the rear frame 24 side view is a triangular battery protection frame 33; rear joint member 34 installed in the rear end of the rear frame 24; 34 and a pair of left and right rear buffer units 36, 36 on the rear end of the swing arm 31 (only the symbol 36 on the front side is shown in the figure); the central trunk 37 installed on the top of the rear frame 24; The front trunk 38 provided at the lower part of the front. It should be noted that reference numeral 41 denotes a front fender covering the front wheels 12 from above, 42 denotes an armrest held by a passenger seated at the rear of the seat 18, and 43 denotes a rear fender covering the rear wheels 14 from above. fender.

The electric motor 13 is an in-wheel motor partially inserted into a hub 45 a provided at the center of a wheel 45 constituting the rear wheel 14 so that the electric motor 13 can be arranged compactly.

The front joint member 23 is a member that respectively connects the main frame 22, the rear frame 24, and the swing arm 31 of different bodies. Different main frames, swing arms, and combinations of the main frame, rear frame, and swing arms can be easily changed, thereby increasing the degree of freedom of the vehicle body structure.

The rear frame 24 is a member formed by bending one round pipe.

The rear joint member 34 is a member assembled with the rear end of the rear frame 24 by fitting and joining by welding. The figure shows the symbol 34a) on the front side.

In Fig. 1 and Fig. 2, the seat 18 is installed at the front end of the central trunk 37 so that it can be opened and closed freely, and the rear part of the seat 18 is supported by the battery protection frame 33 in the closed state, and can be installed on the rear frame 24. Locking mechanism on the side.

Fig. 3 is a left side view showing main parts of the motorcycle.

The PDU 20 includes a PDU main body 20A having a control function and a PDU case 20B for accommodating the PDU main body 20A, and is supported by the sub frame 51 , whereby the PDU 20 is arranged below the main frame 22 and the front joint member 23 . Generally, in a motorcycle equipped with an engine, the engine, a pivot plate for supporting the pivot, etc. are arranged below the rear end of the main frame, but in this motorcycle, the engine, the pivot Arranging the PDU 20 in the space of the shaft plate and the like makes it possible to effectively use the space of the motorcycle.

One end of a subframe 51 supporting the PDU 20 is attached to the rear lower portion of the main frame 22 , and the rear end of the subframe 51 is supported by a pivot 28 .

The subframe 51 includes: a pair of left and right L-shaped frames 52, 52 (only the symbol 52 on the front side is shown) formed in an L-shape in side view; Horizontal tubes 53 at respective rear ends of the L-shaped frames 52, 52; a pair of left and right upper extension frames 54, 54 (only symbols on the front side are shown in the figure) extending upward from the horizontal tubes 53 and having their upper ends connected to the pivot shaft 28. 54); a pair of left and right lower extension plates 56, 56 extending downward from the transverse tube 53 (only the symbol 56 on the front side is shown); the support shaft 57 erected on the lower extension plates 56, 56; The PDU 20 is attached to the PDU attachment parts 58, 58 provided on the L-shaped frames 52, 52, respectively.

On the subframe 51 , in addition to the PDU 20 , a driver's footboard 60 , a main stand 61 , a side stand 62 , and a brake pedal 63 used for braking the rear wheels 14 are attached. The main parking frame 61 and the brake pedal 63 are rotatably supported by the support shaft 57, the foot plate 60 is supported by the lower central part of the L-shaped frame 52, and the side parking frame 62 is parked by the bottom central part of the L-shaped frame 52. The frame supporting member 65 is supported so as to be rotatable.

The rear wall 38 a of the front trunk 38 approaches the front of the subframe 51 along the vertical frame portion 52 a of the L-shaped frame 52 of the subframe 51 . In a motorcycle equipped with an engine, the engine is mounted on the lower part of the main frame 22, but in this motorcycle 10 (refer to FIG. 1 ), a large front trunk 38 is arranged by effectively utilizing the vehicle body space where the engine is arranged. .

Fig. 4 is a perspective view of main parts of the motorcycle viewed from the lower left.

The upper ends of a pair of left and right L-shaped frames 52, 52 constituting the sub frame 51 are attached to the lower portion of the main frame 22, and upper extension frames 54, 54 constituting the rear portion of the sub frame 51 are connected to the left and right sides of the pivot shaft 28. , and on the subframe 51 are supported a driver's footboard 60 , a main parking frame 61 , a side parking frame 62 and a brake pedal 63 .

In this way, by providing the sub-frame 51, it is possible to directly transfer the existing parts (footboards for the driver, main parking frame, side parking frame, brake pedal, etc.) .

Fig. 5 is a perspective view showing main parts of the motorcycle.

Battery cases 32 , 32 are arranged on the left and right sides of the rear frame 24 . , 32 is mounted on the rear frame 24 in the manner of the front surface.

The battery protection frame 33 includes a left protection frame 67, a right protection frame 68, and a connecting frame 69 that connects the rear ends of the left protection frame 67 and the right protection frame 68. The left protection frame 67 and the right protection frame 68 have triangular The upper pipe 71, the front pipe 72, and the inclined pipe 73 on the three sides of the seat are also used as a seat frame for supporting the seat 18 (see FIG. 1 ) through the battery protection frame 33 .

The front portion of the battery protection frame 33 is attached to a battery protection mounting tube (not shown) provided on the rear frame 24 , and the rear portion is connected to the buffer connecting portion 34 a via a bracket provided on the inclined pipe 73 .

Fig. 6 is a perspective view showing a state in which the battery protection frame and the battery case are removed from Fig. 5 .

When the battery case 32, specifically the case cover 75 constituting the battery case 32, is removed from the rear frame 24 side, the plurality of driving batteries supported by the base plate 76 mounted on the rear frame 24 The battery module 77 is exposed. The battery module 77 is a battery module in which a plurality of battery cells are connected in series and accommodated in a case, and electrodes (positive and negative electrodes) of the battery modules 77 are connected in series by a conductive rod 78 . The aforementioned plurality (four) of battery modules 77 constitutes a battery assembly 77S, and the battery assembly 77S is accommodated in the battery case 32 .

The battery case 32 includes a flat base plate 76 mounted on the rear frame 24 and a case cover 75 mounted on the edge of the base plate 76. The case cover 75 is formed from a bottom wall 75a facing the side of the vehicle body and extending from the bottom wall 75a. The edge part of the bottom wall 75a is comprised by the surrounding wall 75b which stands up integrally.

7 is an explanatory view showing an assembled state of the battery module 77, FIG. 7(A) is a side view showing the vehicle frame 16 and the battery module 77, and FIG.

As shown in FIG. 7(A), the base plate 76 of the battery case 32 is a substantially parallelogram-shaped plate, and the four battery modules 77 are fixed on the rear side so that the respective longitudinal directions become low at the front and high at the rear. base plate 76 . The inclination angle of the battery module 77 with respect to the horizontal coincides with the inclination angle of the upper portion of the front oblique side 76 a of the base plate 76 .

As shown in FIG. 7(B) , the battery module 77 includes: a module case 77a having a substantially parallelogram-shaped outline; and a plurality of battery cells (not shown) built in the module case 77a.

The module case 77a includes: battery-side fixing portions 77b, 77b integrally provided on the module case 77a at both ends in the longitudinal direction for fixing to the base plate 76; The positive terminal 81 and the negative terminal 82 are attached to the vicinity of the battery side fixing parts 77b, 77b.

Bolt insertion holes 77d are opened in the battery-side fixing portion 77b, and the bolt insertion holes 77d allow the bolts to pass when the battery module 77 is attached to the base plate 76. As shown in FIG.

A positive terminal 81 and a negative terminal 82 are respectively connected to the positive and negative electrodes of a plurality of battery cells built in the module case 77a and connected in series, and the positive terminal 81 and the negative terminal 82 of the adjacent battery module 77 pass through the rod. 78, thereby connecting a plurality of battery modules 77 in series, formed by a battery assembly 77S composed of four battery modules 77, or left and right battery assemblies 77S, 77S (only the symbol 77S on the front side is shown). Is the rated voltage of the motor (refer to Figure 1).

FIG. 8 is an explanatory view showing the base plate 76 attached to the rear frame 24, FIG. 8(A) is a perspective view, and FIG. 8(B) is a left side view.

As shown in FIG. 8(A), the rear frame 24 is equipped with a lower tube 84 formed of a round tube extending through the rear frame 24 and extending in the vehicle width direction below the curved portion 24a. An upper pipe 85 formed of a circular pipe is joined to the upper surface of the rear frame 24 and extends in the vehicle width direction. The lower pipe 84 and the upper pipe 85 are components on the front left and right sides of the battery protection frame 33 (see FIG. 4 ).

The left and right base plates 76 , 76 are attached to the side surfaces of the rear frame 24 , the lower pipe 84 , and the upper pipe 85 so as to sandwich the rear frame 24 from the left and right.

As shown in FIG. 8(B), the base plate 76 has a plurality of first nuts 87 and a plurality of second nuts 88 mounted on the outer side.

In FIG. 7(B) and FIG. 8(B), a plurality of first nuts 87 are components for threading bolts passing through the bolt insertion holes 77d, 77d of each battery module 77, and are connected to individual battery modules 77. The number of first nuts 87 corresponding to the number (the amount corresponding to four) is provided on the base plate 76 .

In addition, the second nut 88 is a member for attaching another battery module 101 (see FIG. 12 ), which will be described later, to the base plate 76 .

FIG. 9 is a perspective view showing the front joint member 23 .

The front joint member 23 is an integrally formed piece, including: a cylindrical front fitting portion 23a that fits and joins the rear end portion of the main frame 22 inside; The cylindrical upper fitting part 23b that fits and joins the lower end of the rear frame 24; the rear pipe part 23c into which the pivot 28 supporting the swing arm 31 is inserted; the upper fitting part 23b and the rear fitting part are connected. The rear connecting portion 23d. It should be noted that reference numeral 23f is a front reinforcement part that integrally connects the upper surface of the front fitting part 23a and the front surface of the upper fitting part 23b, and 23g, 23g (only the reference numeral 23g on the front side is shown). It is a pair of left and right side part reinforcement parts which integrally connected the upper part fitting part 23b, the rear part connection part 23d, and the rear part pipe part 23c.

By using such a front joint member 23, the main frame 22 and the rear frame 24 can be connected according to the shape of the vehicle body, the model of the vehicle (so-called cubic type (cub type), naked type (naked type), scooter type, etc.) and the combination of the swing arm 31 can be freely changed to other combinations.

FIG. 10 is a perspective view showing the rear joint member 34 .

The rear joint member 34 includes: a cylindrical rear end fitting part 34c fitted and joined to the rear end part of the rear frame 24; and extend downward; the horizontal pipe 34g is installed in such a way that the pair of left and right downward extensions 34e, 34e extend along the vehicle width direction, and the left and right pair of downward extensions 34e, 34e extend downward Provided on the shaft support portion 34d; the transverse shaft 34h, which fits and engages with the hollow portion of the transverse tube 34g, wherein the rear end fitting portion 34c is integrally formed with the shaft support portion 34d.

The portion of the transverse shaft 34h protruding from the transverse tube 34g to the left and right serves as the buffer connecting portions 34a, 34a (only the symbol 34a on the front side is shown) connecting the upper ends 36a, 36a of the rear buffer units 36, 36 .

By providing such a rear joint member 34, the distance between the left and right rear buffer units 36, 36 in the vehicle width direction, the shape of the rear buffer unit 36, or the positional relationship between the rear frame 24 (see FIG. 2 ) and the rear buffer unit 36 can be adjusted. By changing the rear joint member 34, it is easy to correspond to various vehicles.

11 is an explanatory diagram illustrating the battery module 77, FIG. 11(A) is a perspective view showing the battery module 77, FIG. 11(B) is a side view of the battery module 77 viewed from the inside in the vehicle width direction, and FIG. It is a perspective view showing a state where the module case is removed from the battery module 77 .

As shown in FIG. 11(A), the module case 77a includes a case body 77f integrally formed with battery-side fixing portions 77b, 77b, and a case cover 77g that closes the opening of the case body 77f. The case cover 77g is attached to case main body 77f with the several screw 91.

Fig. 11(B) shows the state where the case cover 77g (see Fig. 11(A)) is removed from the case body 77f, and Fig. 11(C) shows the three battery cell assemblies taken out from the case body 77f 93.

In Fig. 11(B) and (C), inside the case main body 77f, a plurality of (here, three) battery cell assemblies 93 having a substantially parallelogram shape are formed so as to be substantially parallel to the case main body 77f. The quadrilateral inner surfaces 77h are closely arranged so as to be in contact with each other. The battery cell assembly 93 includes a plurality of (nine in this case) cylindrical battery cells 95 and a film-shaped covering member 96 covering the outside of the battery cells 95, and the battery cells 95 are arranged adjacent to each other. , the shape of the battery cell assembly 93 is maintained by the covering member 96 .

As shown in FIG. 2 and FIG. 7(A) and (B) above, in the motorcycle 10 as an electric vehicle in which the battery module 77 that supplies electric power to the motor 13 serving as a driving motor is supported by the vehicle frame 16, The vehicle frame 16 is characterized in that the vehicle frame 16 includes a main frame 22 extending rearward and downward from a head pipe 21 constituting its front portion, a rear frame 24 arranged behind the main frame 22 and extending rearward and upward, and a front end of the rear frame 24 The front joint member 23 partially connected to the rear end of the main frame 22 supports battery modules 77 serving as batteries on the left and right sides of the rear frame 24 .

According to this structure, even when the model of the motorcycle 10 is different, the combination of the main frame 22 and the rear frame 24 can be changed by changing the front joint member 23, thereby being able to cope with various changes. Cost reduction and productivity improvement can be achieved by diverting the rear frame 24 that supports the battery module 77 to a plurality of models.

In addition, as shown in FIG. 7(A), (B) and FIG. A plurality of first nuts 87 and second nuts 88 serving as fixing parts for supporting the battery modules 77 and 101 , and the installation positions of the battery modules 77 and 101 with respect to the base plate 76 can be changed by the first nuts 87 and the second nuts 88 The first nut 87 and the second nut 88 can correspond to and support a plurality of types of battery modules 77 and 101 with different shapes. Therefore, by providing a plurality of first nuts 87 and a plurality of second nuts The nut 88 can be supported by the first nut 87 or the second nut 88 corresponding to a plurality of types of battery modules 77 and 101 having different shapes, so that it is not necessary to prepare separately for corresponding to a plurality of types of battery modules 77 and 101 . The base plate 76 can reduce the number of parts and achieve cost reduction and productivity improvement.

In addition, the battery modules 77 and 101 are arranged obliquely so that the longitudinal direction thereof becomes low at the front and high at the rear. Therefore, the battery modules 77 and 101 are arranged approximately along the rear frame 24 extending rearward and upward, thereby enabling efficient use of the rear frame 24. The overall length of the battery modules 77 and 101 is increased by reducing the space on both sides, and the battery capacity can be increased in a limited space.

In addition, as shown in FIG. 13 and FIG. 14 (A) to (C), the base plate 76 supports the battery support bracket 112 as a bracket that is attached to the first nut 87 or the second nut 88 by bolts to support the drive. Therefore, by using the battery support bracket 112 , more types of driving batteries 115 can be supported by the same base plate 76 .

In addition, as shown in FIGS. 1 and 2 , the rear frame 24 also serves as a seat frame for supporting the seat 18 , so that there is no need to provide a seat frame in particular, and the number of parts can be reduced, resulting in cost reduction and productivity improvement.

In addition, the front joint member 23 supports the swing arm 31 to swing freely up and down. The rear wheel 14 as a wheel driven by the motor 13 is attached to the swing arm 31, so that the front joint that connects the main frame 22 and the rear frame 24 can Since the member 23 also serves as a support member for the swing arm 31 , it is not necessary to provide a support member for the swing arm 31 in particular, and cost reduction and productivity improvement can be achieved.

In addition, as shown in FIG. 6 and FIG. 7(A), (B), the battery module 77 is accommodated in a case that is a cover member that covers the base plate 76 attached to the rear frame 24 and the side of the base plate 76. Therefore, the battery module 77 can be protected from flying stones, dust, rain, and the like. Furthermore, maintenance of the battery module 77 can be easily performed by removing the case cover 75 from the base plate 76 .

In addition, as shown in FIGS. 3 and 4 , the PDU 20 for controlling the motor 13 is disposed below the rear end of the main frame 22 and below the front joint member 23 , so the rear end of the main frame 22 can be effectively used. and the space below the front joint member 23.

In addition, as shown in FIG. 2 , the battery case 32 overlaps a part of the rear wheel 14 in a side view, and the rear wheel 14 is between the left and right battery cases 32 , 32 (only the symbol 32 on the front side is shown). Therefore, even if the left and right battery cases 32, 32 are enlarged, there is no interference with the rear wheel 14, and a large battery module 77 (or battery module 101 (see FIG. 12 ) can be accommodated in the battery case 32. ).

In addition, as shown in FIGS. 1 , 5 and 6 , the battery case 32 is covered from the outside in the vehicle width direction by a battery protection frame 33 mounted on the rear frame 24 , and the battery protection frame 33 doubles as a seat for supporting the seat 18 . Therefore, the battery case 32 and the battery module 77 can be protected from the side by the battery protection frame 33, and the battery case 32 and the battery module 77 can be protected, and there is no need to set a seat frame in particular, and the number of parts can be reduced, thereby enabling Realize cost reduction and productivity improvement.

In addition, as shown in FIGS. 5 and 9 , the front joint member 23 has a pivot 28 extending in the vehicle width direction, and a swing arm 31 that can swing up and down is supported on the pivot 28 . The conventional pair of left and right pivot frames for supporting is also used as a pivot frame by the front joint member 23, so that the number of components can be reduced, and cost reduction and productivity improvement can be realized.

<Second Embodiment>

FIG. 12 is a side view showing the arrangement of the second embodiment of the battery module (battery module 101 ), and the same components as those in the embodiment shown in FIG. 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.

A plurality (two) of battery modules 101 are fixed to the base plate 76 so that the respective longitudinal directions are tilted backward so that the front is low and the rear is high. The inclination angle of the battery module 101 with respect to the horizontal coincides with the inclination angle of the rear oblique side 76 c of the base plate 76 . The battery module 101 includes a module case 101a having a substantially parallelogram-shaped outline and a plurality of battery cells (not shown) built in the module case 101a, and includes: In order to fix to the base plate 76, the battery side fixing parts 101b, 101b are integrally provided on the module case 101a; the positive terminal 81 is installed on the outer surface of the module case 101a and near the battery side fixing parts 101b, 101b And negative terminal 82. The aforementioned plurality (two) of battery modules 101 constitutes a battery assembly 101S, and the battery assembly 101S is housed in the battery case 32 .

Bolt insertion holes are opened in the battery-side fixing portion 101 b through which the bolts 102 pass when the battery module 101 is attached to the base plate 76 . The plurality of bolts 102 are screwed to the second nuts 88 (see FIG. 8(B) ) of the base plate 76 .

A positive terminal 81 and a negative terminal 82 are respectively connected to the positive and negative electrodes of a plurality of serially connected battery cells built in the module case 101a, and the positive terminal 81 and the negative terminal 82 of the adjacent battery module 77 are composed of Conductive rods 103 are connected, thereby connecting a plurality of battery modules 101 in series, so that the battery assembly 101S composed of two battery modules 101, or the left and right battery assemblies 101S, 101S (only the front side is shown in the figure) Symbol 101S) is formed as the rated voltage of the motor 13 (refer FIG. 1).

<Third Embodiment>

FIG. 13 is a perspective view showing a third embodiment of a driving battery and a battery case. The same components as those in the embodiment shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

A battery case 111 accommodating a driving battery that supplies electric power to the motor 13 (see FIG. 1 ) is attached to the base plate 76 at the rear of the vehicle body via a battery support bracket 112 . The battery case 111 includes a battery case main body 111 a supported by a battery support bracket 112 and a battery case cover 111 b closing the opening of the battery case main body 111 a.

14 is an explanatory diagram illustrating the battery case 111 and the driving battery 115. FIG. 14(A) is a perspective view showing the battery case 111. FIG. 14(B) is a perspective view showing the driving battery 115. FIG. 14(C) It is a perspective view showing the battery support bracket 112 .

As shown in FIG. 14(A), the battery case 111 is composed of a battery case main body 111a and a battery case cover 111b, and has an upper and lower upper layer formed by the battery case main body 111a and the battery case cover 111b. Out of the box portion 111c and the lower box portion 111d, the upper box portion 111c is provided at a position shifted toward the rear of the vehicle relative to the lower box portion 111d. The partition wall 111f partitions and accommodates the drive battery 115 inside the upper case part 111c and the lower case part 111d, respectively. The above-mentioned two driving batteries 115 constitute a battery assembly 115S, and the battery assembly 115S is accommodated in the battery case 111 .

As shown in FIG. 14(B) , the box-shaped drive battery 115 is formed by stacking a plurality of plate-shaped battery cells, and is built in series and connected. The upper surface of the driving battery 115 is provided with a positive electrode 116 and a negative electrode 117, and one electrode (such as the negative electrode 117) in the positive electrode 116 and the negative electrode 117 is connected to the other driving battery 115 (not shown) through a lead wire not shown. (shown) electrodes (for example, positive electrode 116 ) are connected in series, and a battery assembly 115S composed of two driving batteries 115 , or left and right battery assemblies 115S, 115S (only the symbol 115 on the front side is shown) forms the motor 13 (Refer to Figure 1) for the rated voltage.

As shown in FIG. 14(C), the battery support bracket 112 includes: an upper support plate 121 formed by bending a sheet; and a lower support 122 attached to the lower portion of the upper support plate 121 by welding.

The upper support plate 121 includes: a flat portion 121b provided with a plurality of bolt insertion holes 121a; an upper curved portion 121c bent from the upper edge of the flat portion 121b and extending upward; Two extended lower curved parts 121d, 121e.

The flat portion 121 b is attached to the base plate 76 by screwing bolts inserted into the plurality of bolt insertion holes 121 a and the first nut 87 and the second nut 88 of the base plate 76 .

The upper curved portion 121c includes an upper first curved portion 121g bent and erected from the flat portion 121b, an upper extension portion 121h extending upward from the edge of the upper first curved portion 121g, and an upper extension portion 121h bent and erected from the upper extension portion 121h. The upper second curved portion 121j is raised, and a plurality of screw insertion holes 121m are opened on the upper second curved portion 121j, and small screws 124 (refer to FIG. 13 ) are inserted into the screw insertion holes 121m and connected with the battery case. The upper surface of the main body 111 a (see FIG. 13 ) is screwed together, thereby supporting the battery case 111 (see FIG. 13 ) on the upper part of the battery support bracket 112 .

In FIG. 14(C), the lower bent portion 121d includes a lower first bent portion 121n bent and raised from the lower edge of the flat portion 121b, and a lower first extended portion 121p extending downward from the lower first bent portion 121n. The lower bent portion 121e includes a lower second bent portion 121q bent and raised from the lower edge of the flat portion 121b, and a lower second extended portion 121r extending obliquely downward and rearward from the lower second bent portion 121q.

The lower support 122 includes: an L-shaped first bracket 126 whose upper end is installed on the lower first extension 121p of the upper support plate 121; the second bracket 127; the bridging plate 128 erected and installed on the lower parts of the first bracket 126 and the second bracket 127 respectively. The bridging plate 128 is provided with a plurality of small screw insertion holes 128a, and small screws (not shown) are inserted into the screw insertion holes 128a and threaded on the lower surface of the battery case main body 111a (refer to FIG. 13 ). Combined, thereby supporting the battery case 111 at the lower portion of the battery supporting bracket 112 (see FIG. 13 below).

<Fourth Embodiment>

Fig. 15 is a main part side view showing a fourth embodiment of the motorcycle, and the same structures as those in the embodiment shown in Fig. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The motorcycle 130 is an electric vehicle in which a power unit 131 is installed at the rear end of the swing arm 31 and a rear wheel 14 is installed on the output shaft 132 of the power unit 131. The power unit 131 includes: an electric motor 134 as a driving source ; the reduction mechanism 136 connected to the rotating shaft 135 of the motor 134 and having the above-mentioned output shaft 132 ; The lower end of the rear buffer unit 36 is swingably connected to the rear end of the power unit 131 .

<Fifth Embodiment>

Fig. 16 is a main part side view showing a fifth embodiment of the motorcycle, and the same structures as those in the embodiment shown in Fig. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The motorcycle 140 is an electric vehicle in which a vertically swingable power unit 141 is attached to a pivot shaft 28 and a rear wheel 14 is attached to an output shaft 142 of the power unit 141 . The power unit 141 is equipped with a motor 144 as a drive source and a speed reduction mechanism (not shown) connected to the motor 144 at the rear of its transmission housing 143, and a pair of motors 144 is disposed at the front of the transmission housing 143. PDU145 for drive control. The lower end of the rear buffer unit 36 is swingably connected to the rear end of the transmission case 143 .

<Sixth Embodiment>

FIG. 17 is a perspective view showing a sixth embodiment of the motorcycle. The same components as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The motorcycle 150 is a scooter-type electric vehicle with a front wheel 152 steered by a handlebar 151 at the front of the vehicle body and a rear wheel 154 driven by an electric motor 13 at the rear of the vehicle body. The vehicle frame 156 is covered by a body cover 157 Covering, a seat 158 is installed at the rear upper part, and the bottom between the handlebar 151 and the seat 158 is provided with a bottom pedal 159 for the driver to put his feet on.

The body cover 157 includes: a front cover 161 covering the front of the vehicle body; a floor board 159; The symbol 162 on the front side); the central cover 163 which is continuous with the rear end of the floor board 159 and covers the lower part of the front part of the seat 158; A pair of left and right body side covers 165, 165 (only the symbol 165 on the front side is shown in the figure) covered under the side ends of the seat 158; Cover 166. In addition, reference numeral 171 is a headlight, 172 is a handlebar cover which covers the center part of the handlebar 151, 173 is a front fender which covers the front wheel 152 from above, 174 is a taillight, 176 is a handlebar cover from above. The rear fender that will cover the rear wheel 154.

Fig. 18 is a left side view showing the motorcycle 150 with the body cover removed.

The motorcycle 150 includes a body frame 156 as a skeleton. The frame 156 includes a head pipe 181 provided at its front end, a main frame 182 extending obliquely downward and rearward from the head pipe 181 , and a rear end attached to the rear end of the main frame 182 via a front joint member 183 . frame 24.

Specifically, the motorcycle 150 includes: a front fork 185 steerably attached to the head pipe 181; a front wheel 152 attached to the lower end of the front fork 185 via an axle 186; The handlebar 151 (refer to FIG. 17 ) installed; the swing arm 31 mounted on the front joint member 183 swingably up and down via the pivot 28; the motor 13 installed at the rear end of the swing arm 31; The rotating shaft (not shown) is the rear wheel 154 driven by the motor 13; the battery case 32, 32 ( Only the symbol 32 on the front side is shown in the figure); in order to protect the driving batteries in the battery cases 32 and 32 from the side, the battery protection frame 33 installed on the rear frame 24; The PDU188 installed at the bottom; the rear joint member 34 connected with the rear end of the rear frame 24; the left and right pair of rear buffer units 187, 187 (only shown in the figure) respectively erected on the rear joint member 34 and the rear end of the swing arm 31 The symbol 187 on the front side is shown); the central trunk 37 installed on the upper part of the rear frame 24 .

That is, compared with the motorcycle 10 shown in FIG. The protection frame 33 , the rear joint member 34 , the electric motor 13 , and the center trunk 37 are the main parts of the electric vehicle, but the PDU 188 , rear wheels 154 , and rear buffer units 187 and 187 are different. The PDU 188 is connected to a driving battery (not shown) to control the driving of the electric motor 13 .

FIG. 19 is a perspective view showing the front joint member 183 .

The front joint member 183 is an integrally formed piece, including: a cylindrical front fitting part 183a that fits and joins the rear end part of the main frame 182 inside; The cylindrical upper fitting part 183b which fits and joins the lower end part of the rear frame 24; Extends from the upper fitting part 183b to both sides and the rear, and extends to the rear part which supports the swing arm 31 via the pivot shaft 28 Section 183c. It should be noted that reference numeral 183f is a front reinforcing part that integrally connects the upper surface of the front fitting part 183a and the front surface of the upper fitting part 183b; The joint part 183b and the rear part extension part 183c are a pair of left and right side part reinforcement parts connected integrally.

The rear extension part 183c has pivot insertion holes 183h and 183h (only the symbol 183h on the front side is shown in the figure) through which the pivot shaft 28 passes are opened on both side surfaces.

As shown in FIG. 18 above, a power drive unit (PDU) 188 for controlling the motor 13 is disposed on the bottom surface of the battery case 32 and above the swing arm 31, so that the battery case 32 and the swing arm 31 can be effectively used. The space formed between to configure the PDU188. Moreover, the sandstone or muddy water splashed from the road surface is prevented by the swing arm 31 , so as to prevent the sandstone or muddy water splashed from the road surface from colliding with the PDU 188 .

<Seventh embodiment>

Fig. 20 is a perspective view showing a seventh embodiment of the motorcycle, and the same structures as those in the embodiment shown in Figs. 2 and 17 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The motorcycle 190 is an electric vehicle. Compared with the motorcycle 150 shown in FIG.

That is, motorcycle 190 includes: swing arm 193 vertically swingably attached to front joint member 183 via pivot shaft 28;

Fig. 21 is a left side view showing main parts of the motorcycle with the body cover removed.

The rear frame 196 constituting the vehicle frame 192 of the motorcycle 190 (see FIG. 20 ) is a member to which a frame side bracket 197 is attached to a bent portion 196a thereof. The frame side bracket 197 supports the upper end portion of the rear buffer unit 191. To swing freely. The rear frame 196 is composed of the rear frame 24 (see FIG. 2 ) and a frame side bracket 197 , and the upper end of the rear buffer unit 191 is swingably supported by the frame side bracket 197 via a support shaft 195 .

The swing arm 193 includes a pair of arms 198, 198 extending left and right in the front-rear direction (only the symbol 198 on the front side is shown in the figure), and the left and right arms 198, 198 are provided with arms extending in the vehicle width direction. The support shaft 199 is supported by the support shaft 199 at which the lower end of the rear buffer unit 191 is swingably supported.

<Eighth Embodiment>

Fig. 22 is a main part left side view showing an eighth embodiment of the motorcycle, and the same structures as those in the embodiment shown in Fig. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The motorcycle 200 includes: a head pipe 202 constituting a front end portion of a vehicle frame 201; a front fork 203 mounted on the head pipe 202 so as to be steerable; and a front wheel 206 mounted on the lower end of the front fork 203 via an axle 204; A main frame 207 (a member constituting the vehicle frame 201 ) extending obliquely downward from the head pipe 202 ; a rear frame 208 extending obliquely rearward from the rear of the main frame 207 ; a plurality of battery modules 77; a power unit 213 mounted on the rear end of the main frame 207 to swing up and down freely via a pivot 212; a rear wheel 214 mounted on an output shaft 213a of the power unit 213; The motor 216 and PDU217 in the unit 213; the rear buffer unit 218 respectively connected with the rear frame 208 and the power unit 213; the helmet box 220 installed at the bottom of the main frame 207.

In a motorcycle equipped with a gasoline-fueled engine, the helmet box 220 is provided with a full-face helmet 221 that can be accommodated in the space below the main frame 207 where the engine is arranged.

A cover 220 a is provided on a side surface of the helmet box 220 , and by opening and closing the cover 220 a, the helmet 221 can be put in or taken out from the helmet box 220 . In addition, reference numeral 223 is a hinge of the cover 220a, and 224 is a handle used when opening and closing the cover 220a.

The above-described embodiment is merely an example of the present invention, and can be modified and applied arbitrarily without departing from the gist of the present invention.

For example, in the above-mentioned embodiment, the main frame 22 shown in FIG. 7(A), the rear frame 24, and the main frame 182 shown in FIG. The shape of the connection of the circular pipes is not limited thereto. The main frame and the rear frame may also be formed into pipes such as square pipes, ovals or ovals, and the front joint members may be formed into square pipes, ovals, etc. The shape of the connection of pipes such as oval or oval.

Moreover, in the sixth embodiment and the seventh embodiment shown in FIGS. 18 and 20 , the subframe 51 may be attached to the main frame 182 similarly to the case shown in FIG. The PDU 20 is supported, and the PDU 20 is arranged below the main frame 182 and below the front joint member 183 .

In addition, the present invention is not limited to the case of being applied to a motorcycle, and may be applied to straddle-mounted vehicles other than the motorcycle. It should be noted that a straddle type vehicle is a vehicle as follows: it includes all vehicles that straddle the vehicle body, including not only motorcycles (including bicycles with prime movers), but also vehicles classified as ATV (uneven vehicles). ground vehicles) three-wheeled or four-wheeled vehicles.

Claims (11)

1. An electric vehicle, wherein a battery (77, 101, 115) that supplies electric power to a drive motor (13, 134) is supported on a vehicle frame (16, 156), the electric vehicle is characterized in that The vehicle frame (16, 156) has a main frame (22, 182) extending rearward and downward from a head pipe (21, 181) constituting its front portion, and is arranged behind the main frame (22, 182) and The rear frame (24) extending upwards, the joint member (23, 183) connecting the front end of the rear frame (24) to the rear end of the main frame (22, 182), in the rear frame The left and right sides of (24) support the batteries (77, 101, 115), The battery (77, 101) is supported on the rear frame (24) via a battery support member (76) provided with a plurality of fixing parts for supporting the battery (77, 101). part (87, 88), the fixing part (87, 88) is installed in such a manner that the installation position can be changed relative to the battery supporting member (76), and the shape of the fixing part (87, 88) can be varied The batteries (77, 101) of each type are supported correspondingly. 2. The electric vehicle of claim 1, wherein: The batteries (77, 101) are arranged obliquely so that the longitudinal direction thereof becomes lower at the front and higher at the rear. 3. The electric vehicle of claim 1, wherein: The battery supporting member (76) supports the battery (115) via a bracket (112) attached to the fixing portion (87, 88). 4. The electric vehicle according to any one of claims 1 to 3, wherein: The rear frame (24) doubles as a seat frame supporting the seat (18, 158). 5. The electric vehicle according to any one of claims 1 to 3, wherein: The joint member (23, 183) vertically supports a swing arm (31) on which a wheel (14, 154) driven by the drive motor (13, 134) is mounted. 6. The electric vehicle of claim 5, wherein: The battery (77, 101) is accommodated in a battery case (32), and the battery case (32) is supported by the battery supporting member (76) mounted on the rear frame (24) and the battery The cover member (75) that covers the side of the member (76) constitutes. 7. The electric vehicle according to any one of claims 1 to 3, wherein: A power drive unit (20) for controlling the driving motor (13, 134) is arranged below the rear end of the main frame (22, 182) and below the joint member (23, 183). . 8. The electric vehicle of claim 5, wherein: The batteries (77, 101) are housed in a battery case (32), and the driving motor (13) is disposed on the bottom surface of the battery case (32) above the swing arm (31). , 134) a power drive unit (188) for controlling. 9. The electric vehicle of claim 6, wherein: The battery case (32) overlaps a part of the wheel (14) in side view, and the wheel (14) moves up and down between the left and right battery cases (32). 10. The electric vehicle of claim 6, wherein: The battery case (32) is covered from the outside in the vehicle width direction by a battery protection frame (33) mounted on the rear frame (24), and the battery protection frame (33) also serves as a seat for supporting the seat (18). chair frame. 11. The electric vehicle of claim 5, wherein: The joint member (23, 183) has a pivot shaft (28) extending in the vehicle width direction, and the swing arm (31) is supported by the pivot shaft (28) so as to be able to swing up and down.