TWI548562B - Bicycle rear derailleur - Google Patents

Description

Bicycle rear derailleur

The present invention is generally related to a bicycle rear derailleur. More specifically, the present invention relates to a bicycle rear derailleur having a link set that is moved by a motor unit.

Bicycles typically use a chain drive transmission to transmit a pedaling force to the rear wheel. Chain drive transmissions for bicycles typically use a derailleur to selectively move the chain from one of the plurality of sprockets to the other to change the speed of the bicycle. A typical derailleur has a base member, a movable member that supports the chain guide, and a linkage assembly that is coupled between the base member and the movable member to laterally move the chain guide relative to the base member (eg, moving mechanism). Recently, the derailleur has been equipped with a motor unit to make it easier to shift gears.

In summary, the disclosure herein is directed to various different features of a bicycle derailleur. In one feature, the bicycle rear derailleur is set The assembly includes a linkage and a motor unit that provide a compact or compact configuration.

In view of the state of the art, the present invention provides a bicycle rear derailleur that basically includes a base member, a movable member, a linkage assembly, and a motor unit. The base member is constructed to be mounted to a bicycle. The movable member is movably coupled to the base member. The linkage set includes an outer link pivotally coupled to the base member about a first pivot axis and pivotally coupled to the movable member about a second pivot axis, and pivotally coupled to the base The inner link of the member and the movable member. The motor unit includes an output shaft having an axis of rotation that is parallel to one of the first pivot axis and the second pivot axis. An output shaft of the motor unit drives the outer link to move the moveable member relative to the base member. The inner link moves in response to the movement of the outer link.

Other objects, features, aspects, and advantages of the disclosed bicycle rear derailleur will be apparent to those skilled in the art from the following detailed description of an embodiment of a bicycle rear derailleur. obvious.

Reference is now made to the accompanying drawings which form a part of this original disclosure.

10‧‧‧Bicycle

12‧‧‧ rear derailleur

14‧‧‧Bicycle frame

16‧‧‧Chain

18‧‧‧Base member

20‧‧‧ movable components

22‧‧‧ linkage group

24‧‧‧Motor unit

26‧‧‧Protection agencies

28‧‧‧First bracket member

30‧‧‧Second bracket member

32‧‧‧Bracket shaft unit

34‧‧‧Bolts

36a‧‧‧Low speed shifting section adjustment screw

36b‧‧‧High speed shifting section adjustment screw

38‧‧‧ bolt

40‧‧‧ fixing bolts

42‧‧‧Chain guides

44‧‧‧ shaft parts

46‧‧‧Chain Cage Plate

48‧‧‧Tension pulley

50‧‧‧guide pulley

52‧‧‧ biasing element

54‧‧‧ friction element

56‧‧‧One-way clutch

60‧‧‧First or outer link

62‧‧‧Second or inside link

64‧‧‧ Output shaft

66‧‧‧ pivot

68‧‧‧ pivot

70‧‧‧ pivot

72‧‧‧ biasing members

72a‧‧‧First end

72b‧‧‧second end

74‧‧‧First mounting component

76‧‧‧Second mounting components

80‧‧‧First joint member

80a‧‧‧ first end

80b‧‧‧second end

80c‧‧‧ middle part

82‧‧‧Second joint member

82a‧‧‧ first end

82b‧‧‧second end

84‧‧‧Motor

84a‧‧‧ Output shaft

86‧‧‧ Gear reduction unit

88‧‧‧Shift section position sensor

90‧‧‧Motor housing

94‧‧‧ Output components

94a‧‧‧ gap

94b‧‧‧ cam surface

96‧‧‧ drive linkage

96a‧‧‧Contact part

96b‧‧‧ Output joint

98‧‧‧ biasing element

98a‧‧‧Spiral part

98b‧‧‧First end section

98c‧‧‧second end part

100‧‧‧ pivot

A1‧‧‧First pivot axis

A2‧‧‧second pivot axis

A3‧‧‧ Third pivot axis

A4‧‧‧fourth pivot axis

D1‧‧‧First direction of rotation

D2‧‧‧second direction of rotation

P‧‧‧Chain guide pivot axis

R‧‧‧Rotation axis

S‧‧‧ rear sprocket

X‧‧‧ pivot axis

Figure 1 is a partial side elevational view of the rear of the bicycle with the bicycle rear derailleur in a low speed operating position.

Figure 2 is the rear derailleur shown in Figure 1 in the chain is not engaged A side perspective view of the frame, wherein the rear derailleur is in a low speed operating position.

Figure 3 is a partial side elevational view of the rear portion of the bicycle with the rear derailleur in a low speed operating position with the cover member of the movable member removed.

Figure 4 is a cross-sectional view of the rear of the bicycle with the rear derailleur in a low speed operating position.

Figure 5 is a perspective side view of the selected portion or part of the rear derailleur of Figures 1 and 2 with the rear derailleur in a low speed operating position.

Figure 6 is a perspective side view of a selected portion or part of the rear derailleur of Figures 1 and 2 with the rear derailleur moved from the low speed operating position of Figure 5 to the intermediate operating position.

Figure 7 is a perspective side view of a selected portion or part of the rear derailleur of Figure 6 with the guard mechanism in a first, non-driven transmission position.

Figure 8 is a perspective side view of a selected portion or part of the rear derailleur of Figure 6 with the guard mechanism in a second, non-driven transmission position.

9 is a top plan view of selected portions or parts of the rear derailleur of FIGS. 1 and 2 showing the base member supporting the motor unit and the outer link being operatively coupled to the motor unit via a guard mechanism.

Figure 10 is a top plan view of selected portions or parts of the rear derailleur of Figures 1 and 2 showing the internal components of the motor unit.

Figure 11 is a perspective side view of a selected portion or part of the rear derailleur of Figures 1 and 5 showing the motor unit and being protected via a guard mechanism The outer link is operatively coupled to the motor unit.

Figure 12 is a perspective view of the frame of the motor unit, the outer link, and the guard mechanism of the rear derailleur of Figures 1 and 2, but with the drive link removed.

Figure 13 is a side elevational view of another frame of the motor unit, outer link, and guard mechanism of the rear derailleur of Figures 1 and 2, but wherein the drive link is removed.

Figure 14 is a side view of the frame of the motor unit, outer link, and guard mechanism of the rear derailleur of Figures 1 and 2 of Figure 13, but with the outer link moved to a high speed operating position.

Figure 15 is a side elevational view of the selected portion or part of the rear derailleur of Figure 6 with the guard mechanism in a first, non-driven transmission position.

Figure 16 is a side elevational view of the selected portion or part of the rear derailleur of Figure 6 with the guard mechanism in a second, non-driven transmission position.

Selected embodiments are described below with reference to the drawings. It will be apparent to those skilled in the art that the following description of the embodiments of the invention is intended to be illustrative only and not to limit the invention as defined by the scope of the appended claims.

Referring first to Figure 1, a rear portion of a bicycle 10 including a bicycle rear derailleur 12 and other components in accordance with an illustrative embodiment is shown. The rear derailleur 12 is secured to the rear of the bicycle frame 14 in a conventional manner as discussed below. Rear derailleur 12 is actuated by becoming a shift The device's electrical rear shifter (not shown) is operated. The electric rear shifter operates the rear derailleur 12 between a plurality of shift stage (gear position) positions such that the chain 16 is biased by the rear derailleur 12 in a plurality of rear sprockets in the lateral direction. Move between S. The rear derailleur 12 is shown in the low speed shifting section (gear position) position in FIG. The term "low shift section (gear position)" as used herein refers to the rear derailleur 12 in an operational position corresponding to the chain 16 being guided to the rear sprocket S having the largest number of teeth. The term "top shift position (gear position)" as used herein refers to the rear derailleur 12 in an operational position corresponding to the chain 16 being guided to the rear sprocket S having the smallest number of teeth.

The bicycle rear derailleur 12 basically includes a base member 18, a movable member 20, and a link set 22. Motor unit 24 is operatively coupled to linkage set 22 to move movable member 20 relative to base member 18. Thus, in the illustrated embodiment, the rear derailleur 12 constitutes an electric or motorized rear derailleur. The guard mechanism 26 operatively couples the motor unit 24 to the linkage set 22 to provide protection to the motor unit 24 as discussed below.

In the illustrated embodiment, the base member 18 includes a first bracket member 28, a second bracket member 30, and a bracket axle unit 32. The first and second bracket members 28 and 30 are preferably constructed of a rigid rigid material such as a lightweight metal such as an aluminum alloy. The first and second bracket members 28 and 30 are secured together by a pair of bolts 34. The motor unit 24 is supported by the first bracket member 28 with one of the bolts 34 being passed through the motor unit 24 to secure the motor unit 24 to the base member 18. Between the second bracket members 30. As seen in FIG. 2, the first bracket member 28 also includes a low speed shifting segment adjustment screw 36a and a high speed shifting segment adjusting screw 36b for setting the range of movement of the movable member 20 relative to the base member 18. The bracket shaft unit 32 is attached to the first bracket member 28 by bolts 38. The bracket shaft unit 32 includes a fixing bolt 40. The fixing bolt 40 is screwed into the threaded hole of the bicycle frame 14. Therefore, the base member 18 is constructed to be attached to the bicycle 10 by the fixing bolts 40.

As seen in FIGS. 1 through 3, the movable member 20 is movably coupled to the base member 18 by the link set 22. The movable member 20 includes a chain guide 42 that is pivotally coupled to the movable member 20 by a shaft member 44 for pivoting about a chain guide pivot axis P, wherein the chain The guide pivot axis P is sometimes referred to as the P axis of the rear derailleur. The shaft member 44 is made of several components (not shown) to assist in the assembly of the movable member 20 and the attachment of the chain guide 42 to the movable member 20.

As best seen in Figures 2 and 3, the chain guide 42 basically includes a pair of chain cage plates 46 and tension pulleys 48 rotatably disposed between the pair of chain cage plates 46. And guiding pulley 50. In the illustrated embodiment, the guide pulley 50 is rotatably disposed on the shaft member 44, and the chain guide member 42 is non-rotatably mounted to the shaft member 44. As seen in FIG. 4, a biasing member 52 is disposed between the movable member 20 and the chain guide 42 to bias the chain guide 42 about the chain guide pivot axis P in the first rotational direction D1. Therefore, on the non-facing frame side of the movable member 20, along the chain guide pivot axis P In the case of viewing, the first direction of rotation D1 is the clockwise direction of rotation of the chain guide 42 about the pivot axis P of the chain guide. In the illustrated embodiment, the biasing member 52 is a torsion spring having a helical portion disposed about the shaft member 44, a first spring end engaged with the movable member 20, and engaged with the chain guide 42. Second spring end.

In the illustrated embodiment, the movable member 20 is provided with a friction element 54 that is operatively disposed between the movable member 20 and the chain guide 42 to guide the chain guide 42 around the chain. The second direction of rotation D2 of the pivot axis P of the piece provides frictional resistance. Preferably, the friction element 54 can be adjusted to vary the rotational resistance provided by the friction element 54. Basically, the friction element 54 increases the operating energy of the motor unit 24 as the motor unit 24 moves the movable member 20 relative to the base member 18 toward the low speed shifting position. The friction element 54 constitutes a resistance applying element. In the illustrated embodiment, the one-way clutch 56 is disposed between the friction element 54 and the shaft member 44. The friction element 54 exerts a resistance to the rotational movement of the chain guide 42 with respect to the movable member 20 in the second rotational direction D2. In particular, the friction element 54 applies frictional resistance to the rotational movement of the chain guide 42 by applying frictional resistance to the rotation of the one-way clutch 56. Because the resistance applying element and the one-way clutch, similar to the friction element 54 and the one-way clutch 56, are discussed in detail in U.S. Patent Application Publication No. 2012/0083371, the friction element 54 and the single will not be discussed in greater detail herein. To the clutch 56.

Link set 22 operatively couples movable member 20 to base member 18. In the illustrated embodiment, the linkage 22 includes One or outer link 60 and a second or inner link 62. The outer link 60 is pivotally coupled to the base member 18 about the first pivot axis A1 by the output shaft 64 of the motor unit 24. The outer link 60 is pivotally coupled to the movable member 20 about a second pivot axis A2 by a pivot pin 66. The inner link 62 is pivotally coupled to the base member 18 about a third pivot axis A3 by a pivot pin 68 and is pivotally coupled to the fourth pivot axis A4 by a pivot pin 70. The member 20 is moved. The first pivot axis A1, the second pivot axis A2, and the third pivot axis A3 are offset from each other. Accordingly, the outer and inner links 60 and 62 have a first end pivotally coupled to the base member 18 and a second end pivotally coupled to the movable member 20, thereby defining a four-bar linkage Group configuration.

As seen in Figure 2, the linkage 22 additionally includes a biasing member 72 disposed between the outer link 60 and the inner link 62 to displace the movable member 20 toward a low speed. The segment position is offset from one of the high speed shift segment positions. In the illustrated embodiment, the biasing member 72 is a coil tension spring that biases the movable member 20 toward the low speed displacement segment position. In particular, the biasing member 72 has a first end that is coupled to the outer link 60 by a first mounting member 74 (eg, a screw, a press-fit pin, or other suitable mounting member as shown). 72a, and is coupled to the second end portion 72b of the inner link 62 by a second mounting member 76 (e.g., a screw, press fit pin, or other suitable mounting member as shown). With this configuration, the biasing member 72 is stretched when the movable member 20 is moved from the low speed shifting position to the high speed shifting position. At the low speed shifting position, the biasing member 72 is preloaded (slightly stretched) such that the outer link 60 is at The tip of the contact low speed shifting segment adjustment screw 36a as seen in Figure 2 is shown.

The biasing member 72 helps to absorb the play or gap between the gears of the motor unit 24 and other manufacturing tolerances when the rear derailleur 12 is manufactured. As a result, if the biasing member 72 is not disposed to bias the movable member 20 in one direction, when the motor unit 24 is operated from the first position to the second position with the first amount of rotation and then the motor unit 24 is subsequently When the two rotation amounts are operated from the second position to the first position, the first and second rotation amounts may become slightly different positions. Therefore, the biasing member 72 enhances the displacement of the rear derailleur 12 or the stability of the shift position.

In the illustrated embodiment, the outer link 60 includes a first coupling member 80 and a second coupling member 82, but the outer link 60 can be made from a single component if desired and/or desired. The first end 80a of the first coupling member 80 is pivotally coupled to the base member 18 about a first pivot axis A1 by a first end of the output shaft 64 of the motor unit 24. Specifically, the first end portion 80a of the first coupling member 80 is not fixed to the output shaft 64, but the output shaft 64 is rotatable relative to the first end portion 80a of the first coupling member 80. The second coupling member 82 is rotatably mounted on the second end of the output shaft 64 of the motor unit 24. When the rear derailleur 12 is assembled, attaching the outer link 60 to the output shaft 64 of the motor unit 24 that becomes the pivot of the outer link 60 is easy because the outer link 60 is constructed of several components. The second end 80b of the first coupling member 80 is pivotally coupled to the movable member 20 about the second pivot axis A2 by a pivot pin 66. The first end portion 82a of the second coupling member 82 is pivotally coupled to the first pivot axis A1 by the output shaft 64 of the motor unit 24 Base member 18. Specifically, the first end portion 82a of the second coupling member 82 is not fixed to the output shaft 64, but the output shaft 64 is rotatable relative to the first end portion 82a of the second coupling member 82. The second end portion 82b of the second joint member 82 is fixedly attached to the intermediate portion 80c of the first joint member 80 by the mounting member 74.

The motor unit 24 will now be discussed in more detail. The motor unit 24 includes a motor 84, a gear reduction unit 86, and a shift segment position sensor 88. The motor 84, the gear reduction unit 86, and the shifting stage position sensor 88 are disposed inside the motor housing 90 supported on the base member 18. Motor 84 is a reversible electric motor. Rotation of the output shaft 64 in one direction moves the movable member 20 and the chain guide 42 relative to the base member 18 toward the low speed displacement segment position, and rotation of the output shaft 64 in the other direction will move the movable member 20 and the chain. The guide 42 moves relative to the base member 18 toward the high speed displacement segment position. The output shaft 64 of the motor unit 24 is coupled to the output shaft 84a of the motor 84 by a gear reduction unit 86. The output shaft 64 of the motor unit 24 is coupled to the outer link 60 by a guard mechanism 26 as discussed below. In the illustrated embodiment, the shift segment position sensor 88 is a digital position sensor that is mounted on the gear reduction unit 86 to detect movement of one of the components of the gear reduction unit 86. More specifically, the shift segment position sensor 88 of the illustrated embodiment is formed by a position sensor shutter wheel and a dual channel photo interrupter, wherein the dual wave The light interruption device has a light source or LED (light emitting diode) disposed on one side of the shutter wheel member, and a photoelectric crystal disposed on the other side of the shutter wheel member (for example Light detector).

The output shaft 64 of the motor unit 24 is rotatably mounted within the motor housing 90 to protrude from opposite ends of the motor housing 90 to the outside to pivotally support the outer link 60 on the base member 18. The output shaft 64 of the motor unit 24 has a rotational axis R that is parallel to the first pivot axis A1 and the second pivot axis A2. In this embodiment, the axis of rotation R is also parallel to the third pivot axis A3 and the fourth pivot axis A4. The axis of rotation R of the output shaft 64 is coaxial with the first pivot axis A1 in the illustrated embodiment. The output shaft 64 of the motor unit 24 drives the outer link 60 to move the movable member 20 relative to the base member 18. The inner link 62 moves in response to the movement of the outer link 60. Basically, the moving force of the output shaft 64 of the motor unit 24 is transmitted by the guard mechanism 26 at the intermediate portion 80c between the first pivot axis A1 and the second pivot axis A2 of the outer link 60. To the outer link 60.

The guard mechanism 26 is discussed in more detail below with respect to Figures 12-16. The guard mechanism 26 includes an output member 94, a drive link 96, and a biasing member 98. The guard mechanism 26 basically performs two functions or functions. First, the guard mechanism 26 transmits the driving force of the motor 84 to the outer link 60 in a normal state for moving the movable member 20 relative to the base member 18. Second, the guard mechanism 26 stops the transmission of the driving force of the motor 84 to the outer link 60 so that the motor 84 can continue to operate even if the movable member 20 does not move (eg, jams) relative to the base member 18, or The force with which the movable member 20 moves relative to the base member 18 becomes greater than a prescribed operating force. In this way, the motor 84 or motor unit 24 is borrowed in certain situations. The protection mechanism 26 is protected.

As seen in Figures 15 and 16, the output member 94 is movably operated by the motor 84 of the motor unit 24. In particular, the output member 94 is fixed to the output shaft 64 of the motor unit 24 to rotate together with the output shaft 64. For example, the output member 94 is secured to the output shaft 64 of the motor unit 24 by a splined connection as shown. In this manner, the output member 94 is rotated as the output shaft 64 of the motor unit 24 is rotated by the operation of the motor 84. The moving force (for example, torque) of the output member 94 is at the intermediate portion of the first joint member 80 between the first pivot axis A1 and the second pivot axis A2 of the outer link 60 by the drive link 96. The portion 80c is transferred to the outer link 60. More specifically, the drive link 96 is movably mounted on the outer link 60 so as to connect the driving force of the motor 84 to the drive transmission position of the outer link 60 and the driving force of the motor 84 from the outside. The rod 60 is moved between non-driven transmission positions that are open. A biasing element 98 is disposed between the outer link 60 and the drive link 96 to apply a biasing force on the drive link 96 to bias the drive link 96 into contact with the output member 94. With the drive link 96 in the drive transmission position, the drive link 96 engages the output member 94 to move together. On the other hand, with drive link 96 in the non-drive transfer position, drive link 96 is disengaged from output member 94 to provide relative movement between drive link 96 and output member 94. The drive link 96 is moved from the drive transfer position to the non-drive transfer position when a predetermined resistance against the biasing force of the biasing member 98 on the drive link 96 occurs on the outer link 60.

As seen in Figures 15 and 16, the biasing element 98 is driven A biasing force is applied to the moving link 96 to bias the drive link 96 into engagement with the output member 94. Therefore, the output shaft 64 of the motor unit 24 is coupled to the outer link 60 by the output member 94 and the drive link 96 as a result of the action of the biasing member 98, so that the driving force of the motor 84 is transmitted to the outer link. 60 for moving the movable member 20 relative to the base member 18. The biasing element 98 exerts a biasing force on the drive link 96 that engages the drive link 96 with the output member 94 to maintain the drive link 96 in the drive transmission position. Accordingly, this configuration of the output member 94, the drive link 96, and the biasing member 98 provides an overridable connection between the output shaft 64 of the motor unit 24 and the outer link 60, wherein the output shaft of the motor unit 24 The connection between the 64 and the outer link 60 is switched from the drive transfer position to the non-drive transfer position when the force required to move the movable member 20 relative to the base member 18 becomes greater than a prescribed operating force.

More specifically, in the illustrated embodiment, the drive link 96 is pivotally mounted to the second coupling member 82 by a pivot pin 100 that defines a pivot axis X. The pivot axis X is offset from the rotational axis R of the output shaft 64 of the motor unit 24. The drive link 96 includes a contact portion 96a that receives the biasing force of the biasing member 98, and an output engaging portion 96b that engages the output member 94 to establish a drive transmission position. The output engaging portion 96b is located between the contact portion 96a and the pivot axis X where the drive link 96 is pivotally mounted on the second joint member 82. In the illustrated embodiment, the extendable connection between the output shaft 64 of the motor unit 24 and the outer link 60 is such that the output joint portion 96b and the output member 94 are notched and the output joint is provided. The other of the portion 96b and the output member 94 is provided with a projection that cooperates with the notch to establish a drive transmission position And was established. For example, as shown, the output member 94 includes a notch 94a, and the output engagement portion 96b is a protrusion that cooperates with the notch 94a to establish a drive transmission position.

In the illustrated embodiment, the biasing element 98 is a coil spring that is mounted on the mounting element 74 that attaches the second coupling member 82 to the first coupling member 80. In particular, the biasing member 98 has a helical portion 98a disposed on the mounting member 74, a first end portion 98b that contacts the first coupling member 80, and a second end portion that contacts the drive link 96. 98c. As described above, one end of the biasing member 72 is also coupled to the mounting member 74. Thus, mounting component 74 performs several functions or functions to provide a compact or miniaturized configuration with a very small number of components.

7, 8, 15, and 16 show that the movable member 20 does not move relative to the base member 18 (e.g., jams) or the force that moves the movable member 20 relative to the base member 18 becomes larger than for some reason The case of a predetermined operating force determined by the biasing force of the biasing element 98. If the movable member 20 is stuck and the output shaft 64 of the motor unit 24 is driven by the motor 84, the guard mechanism 26 will allow the output shaft 64 of the motor unit 24 to rotate. In particular, the output member 94 acts to move the cam of the drive link 96 against the biasing force of the biasing member 98. This movement of the drive link 96 by the output member 94 against the biasing force of the biasing member 98 causes the output engagement portion 96b (e.g., the projection) of the drive link 96 to be forced away from the notch 94a of the output member 94. To the cam surface 94b of the output member 94. Once the output engaging portion 96b rests on the cam surface 94b, the output shaft 64 of the motor unit 24 can transmit the driving force to the outside. The link 60 rotates. The cam surface 94b of the output member 94 extends from the notch 94a of the output member 94 in two circumferential directions. In this way, the motor 84 is protected in both directions of operation.

The term "connected" or "connected" as used herein, encompasses a configuration in which an element is directly attached to another element by attaching it directly to the other element, by attaching the element to one or a plurality of intermediate members and the one or more intermediate members are attached to the other member to indirectly fasten the member to the configuration of the other member, and one member is integral with the other member, that is, one member The configuration of the unit part of another component. For example, the magnetized component can be fastened directly to the crank arm attachment portion, or can be indirectly fastened to the crank arm attachment portion via one or more intermediate members, or can be attached to the crank arm Part is integrated. This definition also applies to words with similar meanings, such as the terms "attach", "attached", "combined", "combined", "fixed", "fixed", "bonded", "bonded" , "coupled", "coupled" and its derivatives.

While only selected embodiments have been chosen to exemplify the invention, it will be apparent to those skilled in the art that the invention can be practiced without departing from the scope of the invention as defined in the appended claims. Different changes and corrections. For example, the size, shape, location, or orientation of the various components can be varied as desired and/or desired as long as the functionality that it is intended to achieve is not substantially altered. Components that are shown to be directly connected or in contact with one another may have intermediate structures disposed therebetween unless otherwise explicitly stated. The function of a component can be two Elements are implemented, and vice versa, unless explicitly stated otherwise. The structure and function of one embodiment can be employed in another embodiment. All advantageous points need not be presented simultaneously in a particular embodiment. Each distinct feature that is different from the prior art, whether alone or in combination with other features, should also be considered as a separate description of the applicant's additional invention, including structural and/or functional concepts embodied by such features. Therefore, the above description of the embodiments of the present invention is intended to be illustrative only and not to limit the invention as defined by the scope of the appended claims.

10‧‧‧Bicycle

12‧‧‧ rear derailleur

16‧‧‧Chain

18‧‧‧Base member

20‧‧‧ movable components

22‧‧‧ linkage group

24‧‧‧Motor unit

26‧‧‧Protection agencies

28‧‧‧First bracket member

30‧‧‧Second bracket member

32‧‧‧Bracket shaft unit

34‧‧‧Bolts

38‧‧‧ bolt

40‧‧‧ fixing bolts

42‧‧‧Chain guides

46‧‧‧Chain Cage Plate

48‧‧‧Tension pulley

60‧‧‧First or outer link

62‧‧‧Second or inside link

64‧‧‧ Output shaft

P‧‧‧Chain guide pivot axis

S‧‧‧ rear sprocket

Claims (14)

A bicycle rear derailleur comprising: a base member constructed to be mounted to a bicycle; a movable member movably coupled to the base member; and a link set including a first pivotable shaft a wire pivotally coupled to the base member and pivotally coupled to an outer link of the moveable member about a second pivot axis and pivotally coupled to the base member about a third pivot axis and An inner side link pivotally coupled to the movable member about a fourth pivot axis, the first, second, and third pivot axes being offset from each other; a motor unit including having a first An output shaft of a rotation axis of at least one of a pivot axis and a second pivot axis, the output shaft of the motor unit being configured to pivotally support the outer link, the output shaft of the motor unit driving the An outer link moves the movable member relative to the base member, the inner link moves back in response to movement of the outer link; the drive link is pivotally mounted to the axis of rotation with the output shaft Offset axis; and Pressure element, which is disposed between the outer link and the drive link to apply a biasing force on the drive link. The bicycle rear derailleur according to claim 1, wherein the moving force of the output shaft of the motor unit is between the first pivot axis and the second pivot axis of the outer link. The portion of the outer link is transmitted. The bicycle rear derailleur according to claim 1, wherein the rotation axis of the output shaft is coaxial with the first pivot axis. The bicycle rear derailleur according to claim 1, wherein the output shaft of the motor unit is coupled to the outer link by at least the drive link. The bicycle rear derailleur according to claim 1, wherein the link set includes a biasing member disposed between the inner link and the outer link to bias the movable member to One of the low speed shifting section position and the high speed shifting section position. The bicycle rear derailleur according to claim 1, further comprising: a guard mechanism operatively coupled between the output shaft of the motor unit and the outer link. The bicycle rear derailleur according to claim 6, wherein the outer link includes a first joint member pivotally coupled to the movable member, and is pivotally coupled to the base a member and attached to the second joint member of the first joint member, the guard mechanism including an output member movably operated by the motor unit, the drive link being movably mounted on the outer link Can be a driving force of the motor unit is coupled between a driving transmission position of the outer link and a non-driving transmission position of the driving force of the motor unit from the outer link, and the biasing element is at the driving link A biasing force that engages the drive link with the output member is applied to the rod to retain the drive link in the drive transmission position. The bicycle rear derailleur according to claim 7, wherein the biasing member is mounted on the mounting member that attaches the second coupling member to the first coupling member. The bicycle rear derailleur according to claim 8, further comprising: a biasing member having a first end connected to the mounting member and a second end connected to the inner link . The bicycle rear derailleur according to claim 8, wherein the biasing member is a coil spring having a spiral portion disposed on the mounting member and contacting the first connecting member An end portion and a second end portion contacting the drive link. The bicycle rear derailleur according to claim 7, wherein the drive link is pivotally mounted on the second coupling member. The bicycle rear derailleur according to claim 7 of the patent application, wherein The second coupling member is rotatably mounted on the output shaft of the motor unit. The bicycle rear derailleur according to claim 12, wherein the output member is fixed to the output shaft of the motor unit to rotate together with the output shaft. The bicycle rear derailleur according to claim 1, further comprising: a chain guide pivotally coupled to the movable member about a pivot axis of the chain guide; and a friction member Operatively disposed between the moveable member and the chain guide to frictionally provide rotational resistance to the chain guide about a first rotational direction of the chain guide pivot axis.