CN101179926B - Manned rice transplanter - Google Patents

Abstract

The present invention provides a man-carrying type rice transplanter capable of performing a reliable operation when a worker operates a traveling body while going down to the ground. An agricultural working machine having a front wheel differential device which can be switched to a differential operation state in which the rotation power of an engine is uniformly distributed to left and right front wheels and a differential lock state in which the left and right front wheels rotate integrally; the agricultural machine is configured such that an upper column (46) and a lower column (45) having a steering wheel at the upper end thereof are caused to flex forward and backward by a tilting mechanism (47), and when the forward-tilted upper column (46) is flexed to an angle equal to or smaller than a predetermined value with respect to the lower column (45), a link mechanism (67) linked with this action operates to bring a front wheel differential device into a differential lock state.

Description

Manned rice transplanter

technical field

The present invention relates to a man-carrying type rice transplanter. The steering column of the man-carrying rice transplanter can be bent in the front and rear directions, so that the steering operation of the front wheels can be selectively performed from the walking body and from the front of the walking body. .

Background technique

In the past, there was such a manned type rice transplanter. When the manned type rice transplanter was performing normal rice transplanting work, the operator could perform a steering operation in the forward direction while the operator was riding on the traveling body. When loading or unloading on a ridge or relative to transportation equipment such as a truck, the operator can operate the traveling body while getting off the traveling body. As such a passenger-carrying rice transplanter, Patent Document 1 discloses a structure in which an engine and a gearbox are mounted on the rear side of a four-wheel-drive traveling body, and are erected at the front of the traveling body. The lower operating shaft of the frame is connected to the upper operating shaft on which the steering wheel for front wheel steering is installed on the upper end through a universal joint with a tilt fulcrum, which can change the front and rear tilt angles.

In Patent Document 1, a plurality of recesses are formed on the upper outer periphery of a fixed cam fixed to the vicinity of the tilt fulcrum at the lower end of a cylinder (column) in which an upper operating shaft is rotatably incorporated. On the other hand, on the inner surface of the hood erected on the front part of the traveling body, an inclined lock lever is rotatably arranged up and down, and the inclined lock lever is biased downward by a spring. The portion can be selectively fitted to one of the plurality of recesses, so that the posture of the cylinder with the forward inclination angle appropriately changed can be maintained. In addition, a long hole extending in the front-rear direction of the traveling body through which the cylinder can pass is formed in the hood. The tilt lock lever protrudes toward the rearward direction approaching the operator riding on the traveling body.

In addition, in Patent Document 1, a main clutch pedal is provided on one side of the hood at the front of the traveling body. The operator sits on the seat of the traveling body at a position rearward from the steering wheel, and when the operator depresses the master clutch pedal, power transmission from the engine to the transmission is cut off. In addition, a configuration is disclosed in which the base of the auxiliary lever is fixed to the arm of the main clutch pedal, and the front end of the auxiliary lever is extended further forward than the traveling body (see FIG. 1 ).

According to this configuration, the operator can perform the steering operation of the steering wheel and the connection and disconnection operation of the main clutch both while riding on the traveling body and when getting down on the ground in front of the traveling body.

Patent Document 1: Japanese Patent No. 2574680 (see FIG. 1 , FIG. 4 and FIG. 5 )

However, according to the structure of Patent Document 1, there is a front-wheel differential device in the transmission mechanism of the front-wheel drive, and the rotary power of the engine is evenly distributed to the left and right front wheels. In this situation, either the left or right side of the front wheel may slip, and the over-ridge operation cannot be carried out smoothly.

Contents of the invention

The present invention is made in order to solve the above-mentioned previous problems, and its purpose is to provide a manned type rice transplanter. For this manned type rice transplanter, the operator can go down to the ground and perform steering operation in front of the walking body. Moreover, the differential lock action is applied to the front wheel differential device to ensure the reliability of ground operation.

In order to achieve the above object, the manned type rice transplanter of the present invention described in technical scheme 1 is equipped with a power part such as an engine at the front part of the traveling body with a pair of left and right front wheels and rear wheels, and is connected in a liftable manner at the rear part of the traveling body. In the rice transplanting device, at the front part of the traveling body, a lower column for steering the front wheels is erected on the front side of the arrangement position of the above-mentioned engine, and is connected so as to be bendable in the front-rear direction of the traveling body with respect to the lower column. An upper column having a steering wheel shaft and a steering wheel, wherein an opening through which the upper column can pass forward is provided on a front hood surrounding at least the above-mentioned engine and the above-mentioned column, and an opening that can move forward and backward integrally with the upper column is provided on the upper column. A movable cover covering at least a part of the U-shaped opening of the front hood from the outside, and a posture holding device for changing and maintaining the bent posture of the upper column is provided at the connection part of the upper and lower columns. mechanism, and the operating member of the above-mentioned posture maintaining mechanism changes the relative angle with respect to the upper column as the angle of rotation of the above-mentioned upper column toward the front becomes larger, and a rotatable auxiliary cover is provided on the above-mentioned movable cover to connect the above-mentioned operating member to the inside of the auxiliary cover.

In the invention described in claim 2, in the manned type rice transplanter described in claim 1, the gearbox provided on the above-mentioned traveling body is provided with a differential lock mechanism for the above-mentioned left and right front wheels, and has a linkage mechanism, the interlocking mechanism operates the differential lock mechanism in conjunction with the bending movement of the upper column toward the front of the traveling body, and when the upper column bends toward the front of the traveling body, the movement of the lower column When the included angle between the axis and the axis of the upper column is less than a predetermined value, the linkage mechanism activates the differential lock mechanism.

According to the invention described in claim 3, in the manned rice transplanter described in claim 2, a steering wheel lock mechanism is provided so that when the upper column is bent toward the front of the traveling body, the axis of the lower column and the axis of the upper column If the included angle is below a predetermined value, the steering wheel locking mechanism prevents the steering wheel from turning.

In the invention described in claim 4, in the manned rice transplanter described in claim 1, an opening is provided near the front wheel or the rear wheel of the body cover covering the upper surface of the traveling body, and the opening is configured. , so that an operator located in front of the traveling body can observe the front wheels or the rear wheels through the opening.

In the invention described in claim 5, in the manned type rice transplanter described in claim 4, a partition wall is provided at an opening provided near the rear wheel, and the partition wall is separated from the opening on the traveling body in a side view. The line of sight of the operator at the front is approximately parallel to the above-mentioned rear wheels.

According to the invention described in technical solution 1, when the manned type rice transplanter is climbed over the ridge or climbed up from the road through the inclined board and loaded on the truck, the operator (operator) who got off from the traveling fuselage went around to the walking machine. The front of the body, and then the steering wheel is made to tilt (bend) the upper column forward close to the front of the walking fuselage. And be provided with the posture keeping mechanism that is used to change and keep the bending posture of upper column, the operating member of this posture keeping mechanism changes the relative angle with respect to upper column along with the above-mentioned upper column's turning angle toward the front, so, in operation When the operator goes down to the ground to operate the traveling body, the operation of tilting the upper column with the steering wheel toward the front of the traveling body can be easily implemented. In addition, the operating member of the above-mentioned posture maintaining mechanism is provided in association with the auxiliary cover body opposite to the front part of the above-mentioned movable cover body, so when the operator goes down to the ground to operate the mobile body, when the belt When the upper column of the steering wheel is tilted toward the front of the traveling body, it is not necessary to separately provide an operating member on the movable cover, and the number of parts can be reduced.

According to the invention described in technical solution 2, the differential lock mechanism is activated in conjunction with the bending action of the upper column, and the left and right front wheels rotate integrally, so that only one front wheel slips. It is effective to reliably perform ridge-crossing operations and loading onto trucks. In addition, the differential lock actuation state (and steering wheel lock actuation state) and non-differential lock actuation state (and non-steering wheel lock actuation state) can be selected by the degree of the forward leaning posture of the upper column. When tilting, the above-mentioned differential lock mechanism is actuated, which becomes the differential lock operation of the left and right front wheels. When the included angle is more than a predetermined value, it becomes a non-differential lock state; therefore, the operator can choose the forward leaning posture of the upper column according to the state of the field (whether it is muddy) or the working conditions of the walking body (rice transplanter) , Improve the operability of the rice transplanter.

According to the invention described in claim 3, in the state where the angle between the axis of the lower column and the axis of the upper column when the upper column is bent toward the front of the traveling body is a predetermined value or less, the Hands hold the steering wheel to make it turn, and it is also locked, and the left and right front wheels are fixed (locked) in the straight forward direction. Therefore, the steering wheel does not turn from the wheel side due to the unevenness and slope of the ground, and the straight-forward performance of the rice transplanter can be further improved. At the same time, it is not necessary to firmly fix the steering wheel to prevent the steering wheel from being manipulated.

According to the invention described in claim 4, when the operator operates from the front of the machine body while getting off the machine body, the operator can steer while checking the turning angle, position, and surrounding conditions of the front wheels or rear wheels. Operation has the effect of improving operability.

According to the invention described in claim 5, a partition wall is provided in the opening provided near the rear wheel, and the partition wall is substantially parallel to the line of sight of the rear wheel by an operator positioned in front of the traveling body in a side view. Therefore, the inclination direction of the above-mentioned partition wall becomes the direction intersecting the direction in which the rear wheels splash mud and the like toward the above-mentioned opening, and the partition wall prevents the mud from the rear wheels from passing through the opening, so it is possible to prevent the mud from splashing on the body cover. above. In addition, there is an effect that the operator can easily observe the rear wheels.

Description of drawings

Fig. 1 is a side view of the manned rice transplanter of the present invention.

Fig. 2 is a plan view of the manned rice transplanter.

Fig. 3 is a perspective view of the undercarriage in a state where a body cover and the like are removed.

Fig. 4 is the left side view of the front part of the traveling fuselage such as gearbox, engine, front axle housing, steering part.

Fig. 5 is a side view showing the tilted state of the upper column.

FIG. 6 is a perspective view showing a linkage mechanism of differential lock.

Fig. 7 is a perspective view showing the differential lock device and its linkage mechanism, showing the inside of a part of the transmission in section.

8 is a front view showing an interlocking mechanism of a reclining mechanism, a posture maintaining mechanism, and a differential lock.

Figure 9 is a left side view of the tilt mechanism.

Fig. 10 is a perspective view of a reclining mechanism and a posture maintaining mechanism.

Fig. 11 is an enlarged perspective view showing a reclining mechanism and a posture maintaining mechanism.

Fig. 12 is a perspective view showing the association of the operation member with the auxiliary cover and the like.

Fig. 13 is a plan view showing the internal mechanism of the gearbox.

Figure 14 is a perspective view of the traveling fuselage viewed from above the front.

Fig. 15 is a plan view of the rear portion of the body cover.

Fig. 16 is an enlarged side sectional view of the rear portion of the body cover.

Explanation of symbols

1a main frame

1b subframe

2 gearboxes

3 walking frame

4 front axle housing

5 rear axle housing

7 rice transplanting device

16 body cover

16a Front step

16b rear pedal

16c middle pedal

16e, 16f openings in a substantially U-shape in plan view

16g partition wall

20 steering lower shaft

21 engine

23 steering upper shaft

24 steering wheel

29 travel drive system

30PTO drive system

31 power transmission mechanism

38 gear transmission mechanism

40 output shaft

41 transmission shaft

45 down post

46 up post

47 tilt mechanism

48 posture maintaining mechanism

66 differential lock device

67 linkage mechanism

Detailed ways

The best embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 3 , the traveling body of the four-row planting-type manned rice transplanter of this embodiment has a main frame 1a and a sub-frame 1b. The main frame 1a is formed by connecting a transmission case 2 on which an engine 21 is fixed and a rear axle case 5 on the left and right sides of the transmission case 2 by connecting a metal running frame 3 elongated front and rear. The subframe 1b is configured by arranging and connecting rectangular or cylindrical frame members on the left and right sides of the main frame 1a (see FIGS. 2 and 3 ).

The gearbox 2 is composed of an integral case made of aluminum alloy or the like elongated in the front-rear direction, and internal mechanisms are accommodated therein, and the split case divided toward the left and right of the traveling body is fastened with bolts to be integrated. Front axle cases 4 protrude from left and right side surfaces of the intermediate portion in the front-rear direction of the transmission case 2 , and a rear axle case 5 is attached to the rear end portion of the running frame 3 . Front wheels 4a are attached to the left and right ends of the front axle case 4, and rear wheels 5a are attached to the left and right ends of the rear axle case 5 (see FIGS. 1 and 2). The cross section of the walking frame 3 is formed in an open downward U-shape.

The rear end of the main frame 1a is connected to the rice transplanting device 7 in a liftable manner through a parallel link mechanism 6 composed of upper and lower links. The rice transplanting device 7 is a previously known mechanism, that is, it includes a left and right pair of planting transmission boxes 11, a seedling loading platform 12, a hull 13 and a planting mechanism 14 with seedling claws; 9. The power is transmitted through the universal joint 10. The PTO shaft 9 protrudes backward from the gearbox 2; Below the box 11; the planting mechanism 14 with the seedling claws is installed on the left and right sides of each planting transmission box 11, while lifting up and down between the field surface and the lower end of the seedling-carrying platform 12, from the seedling-carrying platform 12. Seedling pads are divided into one plant and planted one by one. The hydraulic pressure 15 for lifting provided at the rear end of the main frame 1a is installed in association with the parallel link mechanism 6, so that the rice transplanting device 7 can be moved up and down in a wide range.

In addition, a synthetic resin body cover 16 covering the main frame 1a and the sub-frame 1b from above is mainly attached to the sub-frame 1b. On the sub-frame 1b, the seat body 17 is attached to a seat support shaft erected from the sub-frame 1b. In front thereof, a front hood (hood) 19 is fixed to the upper front portion of the vehicle body cover 16 .

In the vehicle body cover 16, at the positions on the left and right outer sides than the front pedals 16a extending along the traveling direction of the traveling body on the left and right sides of the front hood 19, there are provisional seats for placing a plurality of preparatory seedling mats. Seedling platform 18 (with reference to Fig. 1 and Fig. 2). The pillars of each preliminary seedling stand 18 are erected from the sub-frame 1b.

Inside the front hood 19, a lower steering shaft 20, an engine 21, a fuel tank 22, and the like are disposed standing upright from the front end side of the upper surface of the transmission case 2, which will be described later. The upper steering shaft 23 is connected to the lower steering shaft 20 through a universal joint 27, and the upper steering shaft (steering wheel shaft) 23 on which the steering wheel 24 is installed at the upper end can be bent (tilted) toward the front and rear direction of the traveling body. The lower column is erected on the upper front part of the gearbox 2, and surrounds the outer circumference of the lower steering shaft 20, and the upper column 46 surrounds the outer circumference of the upper steering shaft 23, and a tilting mechanism 47 is provided between the upper end of the lower column 45 and the upper column 46. And a posture maintaining mechanism 48 (refer to FIGS. 3 to 6 ) for maintaining the posture of the inclination angle in multiple stages.

In addition, the upper, left, and right central parts of the front hood 19 are formed by cutouts from the upper side to the front end, and are formed in a substantially U-shaped space in plan view. The movable cover 25 is covered by an auxiliary cover 26 connected thereto so as to be rotatable upward.

In the gearbox 2, the steering drive mechanism 28 for steering is built in its front part, and in the middle part to the rear part, a power transmission mechanism 31 (referring to FIG. ). The transmission case 2 has a stepped part in the middle part, and the height of the front part on the upper side of the transmission case 2 is low in side view, and the height increases from the middle part to the rear part. At this stepped portion, a leg portion of a flat engine support member 32 straddling the upper surface of the transmission case 2 in the left-right direction is fixed with bolts. The base portion (crankcase portion) of the engine 21 is fixed to the engine support member 32 , and the piston housing of the engine 21 is arranged to be inclined rearward and upward. The engine 21 may also be fixed upright. At the output shaft 33 of the engine 21 and the input shaft 34 protruding to the side of the middle part of the front-rear direction of the gearbox 2, the previously known belt tension type main clutch mechanism 35a is set as pulleys 33a, 34a and belts of the belt transmission mechanism. 35 , transmit power, and transmit power from the input shaft 34 to the power transmission mechanism 31 in the gearbox 2 .

The power transmission mechanism 31 has a gear-type transmission mechanism 38 that changes the rotational speed from the input shaft 34 . The power is transmitted from the gear type speed change mechanism 38 to the front half shaft 39 with the front wheel differential device (differential mechanism) 39a through the transmission shaft 37 having the travel brake 37a, and the power is transmitted to the output shaft 40 through the bevel gear 37b. The shaft 40 is used to transmit power to the rear wheels (see FIG. 13 ). Therefore, when the service brake 37a is actuated, braking is applied to the front wheel 4a and the rear wheel 5a. The base of the horizontally long cylindrical portion 4b of the front axle case 4 is bolted to the side of the transmission 2, and power is transmitted to the axles of the front wheels 4a from the front half shaft 39 disposed in the horizontally long cylindrical portion 4b. On the other hand, the output shaft 40 protrudes rearward to the right side of the gearbox 2, and is transmitted from the output shaft 40 to the transmission shaft 41 through a universal joint, and the power is transmitted to the traveling drive system that drives the rear wheels. The rear axle housing 5 (refer to Fig. 1 and Fig. 13).

On the other hand, it has the PTO shaft 9 protruding rearward from the rear end of the transmission case 2 via the PTO clutch from the gear type transmission mechanism 38 (refer FIG. 1).

The traveling frame 3 bends the side panels 3b downward from both left and right sides of the upper panel 3a, and has a U-shaped cross section open downward (see FIG. 3 ). Cover the front part of the walking frame 3 from the outside to the rear side of the left and right sides of the gearbox 2, and connect the two side plates 3b of the walking frame 3 to the gear box firmly by connecting bolts 53 from the left and right outer sides in the horizontal direction. side of box 2. In addition, the rear side of the upper panel 3a of the running frame 3 is firmly connected to a pair of bracket parts (Fig. not shown). In addition, the fins 3c on the left and right sides of the traveling frame 3 are fastened to a pair of bracket portions 56 protruding forward from the front portion of the center case portion 5b with fastening bolts (see FIG. 3 ).

The PTO shaft 9 is disposed inside the traveling frame 3, and is supported by a bearing portion (not shown) located at the rear end of the traveling frame 3 and mounted above the central shell portion 5b. The transmission shaft 41 extends along the outer side of the right side of the running frame 3 , and is connected to the shaft at the front of the center housing portion 5 b of the rear axle housing 5 .

A steering link mechanism 44 such as a steering arm, a link, and a tie rod that changes the turning direction of the left and right front wheels 4a is disposed below the steering drive mechanism 28 at the front of the transmission 2 (see FIGS. 3 and 4 ).

Next, the tilting mechanism that can make the upper column 46 bend in the front and rear direction is described, and the tilting mechanism can selectively make the upper column 46 reach the rear position of the steering wheel 24 at the upper end of the upper column 46 close to the seat body 17 that is manipulated and toward the traveling machine. The position where the front side of the body is bent. A fuel tank 22 is fixed to a frame erected from the main frame 1a at a position near the rear inside a front hood (engine hood) 19 made of synthetic resin (or glass fiber reinforced plastic).

A cylindrical lower column 45 is fixedly erected on the front end side of the upper surface of the transmission case 2 located in the front portion within the front hood 19 , and the steering lower shaft 20 erected from the transmission case is arranged inside the lower column 45 . The upper end of the lower steering shaft 20 is flexibly connected with the lower end of the steering wheel shaft 23 through a universal joint 27, and the steering wheel shaft 23 is equipped with a steering wheel 24 for steering at the upper end. The steering wheel shaft 23 is mounted in the upper column 46 so as to be rotatable.

The hook-shaped universal joint 27 is a previously known structure, for example, a pair of opposite parts of the cross-shaped connecting piece 27a and a bifurcated fork at the upper end of the steering lower shaft 20 are rotatably connected by pins. The part 20a, on the other hand, connects the bifurcated fork-shaped part 23a at the lower end of the steering wheel shaft 23 and the other pair of opposing parts of the connecting piece 27a so as to be rotatable through a pin. According to this configuration, when the angle θ1 (refer to FIG. 9 ) between the axis of the lower steering shaft 20 and the axis of the steering wheel shaft 23 is less than a certain angle (for example, approximately 110 degrees or less), the two forks 20a and 23a interfere (contact) , Therefore, the turning force of the steering wheel shaft 23 cannot be transmitted to the lower steering shaft 20, and a so-called steering wheel is locked.

In addition, the upper end of the lower column 45 and the lower end of the cylindrical upper column 46 are connected so as to be tiltable back and forth through a tilting mechanism 47, and a posture maintaining mechanism 48 (refer to FIGS. 6 and 11 ) is provided on the outer periphery of the tilting mechanism 47. The posture is maintained on the inclination angle of the upper column 46 (and thus on the above-mentioned included angle) in multiple stages.

The tilting mechanism 47 can only move the left and right pair of brackets 47a fixed on the upper end of the lower column 45 and the left and right pair of brackets fixed on the lower end of the upper column 46 toward the front and rear directions of the traveling direction of the traveling body through the horizontal pivot 47c. The frame 47b rotates, in other words, the upper column 46 is connected to the lower column 45 so that it can tilt (bend and move) (see FIGS. 6 to 11).

As shown in FIGS. 6 to 11 , the posture maintaining mechanism 48 is recessed in a plurality of positions (in the embodiment) at positions appropriately spaced from the front and rear by the eccentric arc-shaped upper end surface of the side piece of the bracket 47a. The locking grooves 60 (shown by symbols 60a, 60b, and 60c respectively) are rotatably supported on the horizontal shaft 48a of the rear end piece 47d of the above-mentioned upper bracket 47b, and are fixed to the horizontal shaft 48a. The engagement hook 48b at one end is formed by an energizing spring (not shown) that is wound around the horizontal shaft 48a and downward (in the engagement direction of the locking groove 60) to apply force to the engagement hook 48b; when the upper column 46 is changed to When a predetermined backward or forward tilt angle is reached, the engagement hook 48b is selectively engaged with any one of the locking grooves 60 at a plurality of positions, so that the tilting posture of the upper column 46 can be adjusted and maintained.

In the embodiment, as shown in FIG. 5, the upper column 46 can be selected as the first posture I inclined toward the rear of the traveling body (approximately 30 degrees clockwise relative to the vertical line). A second posture II in which the vehicle body is tilted forward approximately 60 degrees in the counterclockwise direction, and a third posture III in which the body is largely tilted forward in the front direction of the vehicle body at approximately 88 degrees in the counterclockwise direction from the first posture I. When the upper column 46 is in the first posture I, the engaging hook 48b is fitted into the rearmost locking groove 60a on the upper surface of the lower bracket 47a. When the upper column 46 is in the second posture II, the engaging hook 48b is engaged with the locking groove 60b at the front and rear central positions, and when the upper column 46 is in the third posture III, the engaging hook 48b is fitted into the front locking groove 60c.

On the other hand, a substantially U-shaped opening 61 in plan view is formed in the left and right central portion of the front hood 19 from the top side to the front end thereof (see FIG. 5 ). The opening 61 is covered by a movable cover 25 that moves back and forth integrally with the upper column 46 , and an auxiliary cover 26 that is rotatably connected to the movable cover 25 . The movable cover 25 and the auxiliary cover 26 are made of synthetic resin or glass fiber reinforced plastic similarly to the front hood 19 . The auxiliary cover 26 is provided so as to be able to turn up and down around the front end side of the movable cover 25 as a center. That is, as shown in FIGS. 3 and 11 , a support pipe 62 is fixedly provided laterally at the front end of the support bracket member 46 a protruding upward from the lower portion of the upper column 46 . On the other hand, a pair of left and right shaft parts 63a of the operating member 63, which is fixed to the back side of the auxiliary cover body 26 and is bent to form a U-shape, and is also used as a reinforcement, is rotatably inserted into both ends of the above-mentioned support pipe 62 (see FIG. 11).

The above-mentioned operation member 63 is associated therewith as an operation unit of the posture maintaining mechanism 48 . That is, as shown in FIGS. 9 to 12 , the link 64 is rotatably connected to a pin 63 b protruding from the shaft portion of the operation member 63 to an eccentric position. The other end of the link 64 is rotatably connected to the front end of the arm 65 . This arm 65 is fixed to the other end of the horizontal shaft 48a which turns integrally with the engaging hook 48b (refer to FIG. 12 ). The auxiliary cover 26 (and further, the lower end side of the operation member 63 ) is brought close to the surface of the front hood 19 by the elastic force of the urging spring.

Therefore, when the auxiliary cover 26 and thus the lower end side of the operation member 63 are rotated upward at a predetermined angle away from the surface of the front hood 19, the engaging hook 48b is moved through the link 64, the arm 65 against the elastic force of the urging spring. The front end portion of the front end part is disengaged from the first locking groove 60a and rotated (unlocked), so thereafter, in the state where the hand is separated from the auxiliary cover body 26 (the inner surface of the lower end side of the auxiliary cover body 26 is in sliding contact with the opening of the front cover 19 In the state of the outer edge of the portion 61), the operator can shift from the first posture I to the second posture II by holding the steering wheel 24. In the second posture II, the front end portion of the engagement hook 48b is engaged with the second engagement groove 60b. In order to move further toward the third posture III, the auxiliary cover 26 (operating member 63) is turned upward again at a predetermined angle, and after unlocking, when the steering wheel 24 is tilted forward, the front end of the engaging hook 48b is engaged with the third latch. Fixed groove 60c. In this way, the upper column 46 can be largely tilted forward toward the front of the traveling body in a stepwise manner.

In this embodiment, from the horizontal pivot 47c serving as the center of inclination (bending action) to the locking grooves at a plurality of positions (three positions in the embodiment) recessed on the outer peripheral surface of the lower bracket 47a The distances between the bottom surfaces of 60a, 60b, and 60c are set to be larger in order, so the downward angle of the auxiliary cover 26 (operating member 63) corresponding to the case where the front end portion of the engaging hook 48b is engaged with the first locking groove 60a is set. Than, when engaged in the second locking groove 60b, the auxiliary cover body 26 (operating member 63) becomes a posture in which the lower end of the auxiliary cover 26 (operating member 63) protrudes further to the front of the traveling body (the posture in which the front hood 19 is separated from the opening 61). When engaged with the third locking groove 60c, the auxiliary cover 26 (operating member 63) becomes a posture in which its lower end protrudes more toward the front of the traveling body (a posture that is far away from the opening 61 of the front hood 19).

When the upper column 46 is in the first posture I, the auxiliary cover 26 is in a substantially vertical posture while covering the front end side of the opening 61 of the front hood 19 in close contact as shown by the solid line in FIG. 1 . , in the side view of the manned type rice transplanter, the axis of the upper post 46 is roughly parallel to the back side of the auxiliary cover 26, and the steering wheel 24 of the auxiliary cover 26 lower end is relatively far away from the steering wheel.

In the state of the second posture II (refer to the solid line state in FIG. 5 ), the angle formed by the axis of the upper column 46 and the back surface of the auxiliary cover 26 is narrowed to about 160 degrees, and the auxiliary cover 26 The lower end is closer to the steering wheel 24 than in the state of the first posture I. In other words, the angle between the back surface of the auxiliary cover 26 (operating member 63) and the vertical direction is about 48 degrees, and the lower end of the auxiliary cover 26 (operating member 63) is close to the operator in front of the traveling body. .

In the third posture III (referring to the two-dot dash line state of Fig. 5 ) in which the steering wheel 24 is positioned at the front and tilted more significantly than the front end of the traveling body, the axis of the upper column 46 and the back side of the auxiliary cover 26 constitute a clamping position III. The angle is narrowed to about 110 degrees, and the lower end of the auxiliary cover 26 is closer to the steering wheel 24 than in the state of the second posture II. In other words, the angle between the back side of the auxiliary cover 26 (operating member 63) and the vertical direction is about 90 degrees, and the lower end of the auxiliary cover 26 (operating member 63) protrudes in a substantially horizontal state toward the front of the traveling body. Become closer to the state of the operator.

Therefore, when the operator is on the ground in front of the traveling body and performs the work of lowering the vehicle, the operator's hand can reach the auxiliary cover 26 more easily when performing the work of tilting the upper column 46 forward.

The operation of making the auxiliary cover body 26 tilt forward can only be performed when the operator is on the ground in front of the traveling body. Problems caused by misoperation can ensure the reliability of ground operations.

In addition, the operator can steer the manned rice transplanter while riding on the traveling body, and the operator who gets down from the traveling body to the ground can hold the steering while standing in front of the traveling body The steering wheel 24 enables the manned type rice transplanter to go over the ridge in the field or change the load to the operation of the truck.

In addition, since the auxiliary cover 26 is provided at the front end of the movable cover 25, an operator who has descended to the ground can more easily perform tilt adjustment while being located in front of the traveling body. When the upper column 46 was in the first posture I of the steering seat 17 direction on the walking fuselage, the opening 61 of the front hood 19 was completely covered by the movable cover 25 and the auxiliary cover 26, so when walking Air resistance also can reduce, and rain, dust also can not enter in the front hood 19.

The differential locking device (the said differential locking mechanism in the claim) 66 and the linkage mechanism (device) 67 are described below; The front wheel differential device 39a is differentially locked (differentially limited) in linkage with the front tilting action of the walking fuselage; operation (differential lock operation). In the differential lock device 66, an engagement cam 72 is provided on the back of the differential pinion 71 in the gear case 70 of the front wheel differential device 39a, and only The drive cam 73 slidably fitted on one of the front half shafts 39 slides. When the driving cam 73 is engaged with the engaging cam 72, the left and right front axle shafts 39, 39 can be driven with the same torque (that is, differential lock action). Conversely, when the drive cam 73 is disengaged from the engagement cam 72, the differential action of the front wheel differential 39a can be exerted (see FIGS. 7, 8 and 11).

On the other hand, on the outer surface of one bracket 47 a at the upper end of the lower column 45 , the pivot arm 75 of the link-type linkage mechanism 67 is supported by a horizontal shaft 76 so as to pivot back and forth. On one side piece 75a of the pivot arm 75, at a position more forward than the front end surface of the one bracket 47a, an actuating pin 77 protruding forward from the universal joint 27 (refer to FIGS. Figure 9). The lower end of the rotary arm 75 is connected to the action arm 78 mounted on the upper end of the action pin 74 by a connecting rod 79 . When the upper column 46 is turned forward, if the angle between the axis of the lower column 45 and the axis of the upper column 46 (the included angle in the claim) is below a predetermined value, the lower end of one side of the upper column 46 fixed on the The front of the lower bracket 47b depresses the actuating pin 77 (referring to the two-dot dash line in Fig. 9), like this, the lower end side of the swing arm 75 turns towards the rear side of the traveling fuselage, and the connecting rod 79 moves backward. Thus, the driving cam 73 is engaged to the engagement cam 72 by the action arm 78 rotating the action pin 74 around the axis. In this way, a link-type interlocking mechanism 67 is formed.

According to the above-mentioned structure, when the manned type rice transplanter is climbed over the ridge or climbed up from the road through the inclined board and loaded on the truck, the operator (operator) who got off from the traveling body goes around to the front of the traveling body, Then, the upper column 46 is tilted forward so that the steering wheel 24 is brought close to the front of the traveling body. When the upper column 46 is tilted forward (bent) as shown in FIG. 5 to a posture (third posture III) in which the upper column 46 is tilted forward to the left end side (third posture III), the above-mentioned differential lock device 66 is actuated, and the left and right sides The front wheels 4a, 4a rotate integrally, and no slippage of only one front wheel occurs. Therefore, the overriding operation and the loading operation of the truck can be reliably carried out. At this time, as mentioned above, since the steering wheel can be locked at the position of the universal joint 27, even if the steering wheel 24 is held by hand to turn, it is also locked, and the left and right front wheels 4a, 4a are fixed (locked). ) to the straight-forward direction. Therefore, the straight-forward performance of the rice transplanter can be further improved. Also in the states of the second posture II and the first posture I, the above-mentioned differential lock operation and steering wheel lock operation cannot be realized.

In this way, the differential lock actuation state (and the steering wheel actuation state) and the non-differential lock actuation state (and the non-steering wheel lock actuation state) can be selected according to the degree of the forward leaning posture of the upper column 46, so the operation The operator can select the forward leaning posture of the upper column 46 according to the state of the field (whether it is muddy), the operating conditions of the walking body (rice transplanter), and improve the operability of the rice transplanter.

On one side of the upper column 46 (the left side of the fuselage when viewed from the operator sitting on the seat body 17 in the embodiment) a compound lever 49 and a main shift lever 50 are arranged; The disengagement of the main clutch and the braking applied to the transmission shaft 37; the main shift lever 50 is used to switch the gear-type transmission mechanism 38 of the gearbox 2 to the second forward gear, the neutral gear and the first backward gear; the upper column 46 The other side (in the implementation form, the right side of the fuselage) is configured with a lifting operating rod 51 (as shown in Figure 3) that drives the hydraulic cylinder 15, and the hydraulic cylinder 15 is used to lift the rice transplanting device 7 . These rods 49 , 50 , 51 are provided in association with the upper column 46 so as to change postures in the front-back direction integrally. That is, the bases of the rods 49 to 51 are attached to brackets or the like provided near the outer periphery of the upper column 46 in side view.

Corresponding rods 49 to 51 are connected to cable operating devices 80 , 81 , and 82 each composed of a flexible outer guide tube and an inner cable (see FIGS. 6 , 8 , and 9 ). The operation part on the gearbox 2 side is omitted from the illustration. The front-end part (operator's grip part) side of each lever 49-51 is located in the outer surface of the movable cover body 25. As shown in FIG.

The linkage mechanism 67 relative to the differential lock device 66 can of course be realized by a cable operating device composed of an outer guide tube and an inner cable.

Next, the configuration of the vehicle body cover 16 will be described with reference to FIGS. 14 to 16 . As shown in FIG. 14, the body cover 16 has left and right front pedals 16a, 16a on the left and right sides of the front hood 19, and has a rear pedal 16b behind the seat of the seat body 17. The front pedals 16a, There is a middle step 16c between 16a and the rear step 16b, and is formed in a substantially rectangular shape in planar view. The rear step 16b is connected to the middle step 16c by a connecting portion 16d raised rearward and upwardly than the middle step 16c. The left and right sides of the connecting portion 16d are formed as fenders facing the left and right rear wheels 5a, 5a. Here, the vehicle body cover 16 is integrally formed of synthetic resin by injection molding, thereby achieving weight reduction, a reduction in the number of parts, and an improvement in workability during assembly.

In the vehicle body cover 16, openings (or notches) 16e, 16e are provided near the left and right front wheels 4a, 4a of the left and right front steps 16a, 16a. Each opening 16e is arranged on the inside of the fuselage more than the front wheel 4a above the front wheel 4a of the front step 16a, and the manipulator (operator, operator) who gets off from the traveling fuselage is positioned at the side of the traveling fuselage. When the steering wheel 24 is rotated to the front position of the front of the fuselage by the tilt mechanism 47 as described above and operated, the rear parts of the left and right front wheels 4a, 4a can be observed through the openings 16e, 16e, and the orientation of the left and right directions can be confirmed. , location and surrounding states, etc. Simultaneously, each opening 16e can observe the front portion of the front wheel 4a when the operator is on the traveling body 2, and can confirm the direction, position and peripheral state thereof in the left-right direction.

Regarding the above-mentioned openings 16e, 16e, in this embodiment, since the outer peripheral portions of the left and right front steps 16a, 16a are located approximately directly above the front wheels 4a, 4a, they become thin-headed from the outside of the fuselage toward the inside. The outer peripheral parts of the front steps 16a, 16a are cut into a substantially V-shape in planar view. In this way, the opening area of the openings 16e, 16e provided at the front of the body cover 16 is set to the necessary minimum limit, so that the function of the front pedals 16a, 16a against the front wheels 4a, 4a, that is, the so-called splash guard function, can be prevented. Mud function is compromised. In addition, even when the front wheels 4a, 4a face to either side of the left and right, the front or rear parts of the left and right front wheels 4a, 4a can be clearly seen through the openings 16e, 16e, so the visibility is improved (refer to FIG. 14 ).

In addition, as shown in FIGS. 14 to 16, openings 16f, 16f are also provided near the left and right rear wheels 5a, 5a of the above-mentioned middle step 16c. The left and right openings 16f, 16f are arranged on the inner side of the fuselage than the rear wheels 5a, 5a in the left-right direction above the rear wheels 5a, 5a of the middle step 16c. The front of the fuselage, when the tilt mechanism 47 is used to rotate the steering wheel 24 toward the front position of the fuselage front as described above, the front parts of the rear wheels 5a, 5a can be observed through the openings 16f, 16f, and the position of the left and right directions can be confirmed. Orientation, location, its surrounding status, etc.

The openings 16f, 16f are thinly formed in a triangular shape in plan view from the rear side of the fuselage toward the front side, have partition walls 16g, 16g extending left and right at predetermined intervals in the front-rear direction, and are configured in a slit shape. . That is, the openings 16f, 16f have a larger opening area as they go to the rear, and the openings expand toward the left and right inside of the fuselage as they go to the rear. Going horizontally downward, you can see the vicinity of the rear wheels 5a, 5a. In addition, the width of the middle step 16c on the outer side of the openings 16f, 16f can be substantially constant to secure strength.

Above-mentioned dividing wall 16g, 16g is integrally formed on middle part pedal 16c by the inclination state of front height and rear low in middle part pedal 16c, makes in side view, and is positioned at the operator who operates steering wheel 24 in front of walking fuselage to rear wheel 5a, The line of sight of 5a (refer to arrow A of FIG. 16) is substantially parallel. Therefore, in the openings 16f, 16f, the inclination direction of the partition walls 16g, 16g is a direction intersecting (substantially perpendicular) to the direction in which the rear wheels 5a, 5a splash mud or the like toward the openings 16f, 16f. 16g prevents mud from the rear wheels 5a, 5a from passing through the openings 16f, 16f, thereby preventing mud from splashing onto the middle step 16c. In addition, the rear wheel 5a is easily seen through the openings 16f, 16f.

In this way, an opening is provided in the vehicle body cover 16, and when the operator (operator, operator) is operating from the front of the vehicle body while getting off the traveling body, the front wheels 4a, 4a or the rear wheels can be observed from the opening. 5a, 5a in the left and right directions, positions, etc., so the steering wheel 24 can be operated while checking the steering angle of the front wheels 4a, 4a or rear wheels 5a, 5a, and the operability is improved. In addition, even when the operator is riding on the traveling body, the steering wheel 24 can be operated while checking the steering angle of the front wheels 4a, 4a, and the operability is improved.

In addition, a plurality of anti-slip members 16h, 16h are provided between the left and right openings 16f, 16f on the upper surface of the middle step 16c. The anti-slip members 16h, 16h are formed in an arc shape in plan view, are located on concentric circles having a center behind the seat of the seat body 17, and are arranged to spread forward from the rear end of the middle step 16c. In this way, the anti-slip members 16h and 16h become anti-slip members when lifting and lowering from the front and side of the pedal, when moving, etc., and when the vehicle seat of the seat body 17 is horizontally rotatable, etc. In the seated state, when kicking and turning left or right around the buttocks, the back of the shoe will not be caught.

The left and right ends of the anti-slip member 16h extend to the vicinity of the openings 16f, 16f or the drain holes 16j, 16j on the left and right rear sides of the middle step 16c, so that rain falling on the middle step 16c, mud, The water flows along the anti-slip member and falls from the openings 16f, 16f or the drain holes 16j, 16j. The same anti-slip members are also provided on the front steps 16a, 16a.

Claims (5)

1. A manned rice transplanter, wherein, The engine and other power parts are arranged in the front part of the traveling body with a pair of left and right front wheels and rear wheels, and the rice transplanting device is connected to the rear part of the traveling body in a liftable manner. At the front part of the traveling body, a lower column for steering the front wheels is erected on the front side more than the arrangement position of the above-mentioned engine, and a steering wheel shaft is connected to the lower column so that it can bend toward the front and rear direction of the traveling body. and the upper column of the steering wheel, characterized in that, In the front hood surrounding at least the above-mentioned engine and the above-mentioned pillar, an opening through which the above-mentioned upper pillar can pass forward is provided, A movable cover that moves forward and backward integrally with the upper column is provided, and the movable cover covers at least a part of the U-shaped opening of the front hood from the outside, A posture holding mechanism for changing and maintaining the bending posture of the above-mentioned upper column is provided at the connecting portion of the above-mentioned upper and lower columns, and the operating member of the above-mentioned posture maintaining mechanism changes the position of the relative upper column as the rotation angle of the above-mentioned upper column becomes larger toward the front. relative angle, A rotatable auxiliary cover is provided on the movable cover, and the operation member is connected to an inner surface of the auxiliary cover. 2. The manned rice transplanter according to claim 1, characterized in that: The gearbox provided on the above-mentioned traveling body is provided with a differential lock mechanism for the above-mentioned left and right front wheels, and has an interlocking mechanism. The above-mentioned differential lock mechanism is operated in conjunction with each other, When the upper column is bent toward the front of the traveling body and the angle between the axis of the lower column and the axis of the upper column is less than a predetermined value, the linkage mechanism activates the differential lock mechanism. 3. The manned rice transplanter according to claim 2, characterized in that: it has a steering wheel locking mechanism, when the above-mentioned upper column is bent toward the front of the above-mentioned traveling body, the clamping between the axis of the lower column and the axis of the upper column If the angle is less than a predetermined value, the steering wheel lock mechanism prevents the steering wheel from turning. 4. The manned rice transplanter according to claim 1, characterized in that: an opening is provided near the front wheel or the rear wheel of the body cover covering the upper surface of the traveling body, and is located on the side of the traveling body. The front operator can observe the front wheel or the rear wheel through the opening. 5. The manned rice transplanter according to claim 4, characterized in that: a partition wall is provided on the opening near the rear wheel, and the partition wall is located in front of the traveling body in a side view. The operator's line of sight to the aforementioned rear wheels is approximately parallel.

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