TW202026199A - Bicycle rear derailleur - Google Patents

Abstract

A bicycle rear derailleur includes a four-link mechanism, a chain guiding assembly, a positioning component, a guiding component and a fixing component. The chain guiding component is pivotably disposed on a movable component of the four-link mechanism. The positioning component is connected to the movable component. The guiding component is disposed on the movable component, and the guiding component is movable between an initial position and a guiding position. The fixing component is rotatably disposed on the chain guiding component. When the guiding component is in the initial position, and the fixing component is moved with the chain guiding component, the fixing component is moved along a first path. The first path is non-overlapping to the positioning component. When the guiding component is in the guiding position, and the fixing component is moved with the chain guiding component, the fixing component is guided by the guiding component to be moved along a second path which is different from the first path so as to be fixed to the positioning component.

Description

Bicycle rear derailleur

The present invention relates to a bicycle rear derailleur, in particular to a bicycle rear derailleur that uses a guide to switch the movement path of a fixed part.

In recent years, the bicycle market has been booming. Whether it is a high-end racing bicycle or a popular bicycle used as a means of transportation and entertainment, it has been favored by consumers, prompting manufacturers to pay more attention to the needs of users for bicycle functions. The body material and equipment function are constantly improving, but the bicycle still needs improvement.

Taking the rear derailleur of a bicycle as an example, a torsion spring is generally arranged between the four-bar linkage structure of the rear derailleur and the chain guide member to make the chain guide member tighten the chain. During disassembly and assembly of the transmission from the frame, the user must first apply force to the chain guide member to resist the torsion force of the torsion spring and allow the chain guide member to pivot, and then insert the fixing pin into the chain guide. The guide member is used to fix the position of the chain guide member and loosen the chain before disassembling the rear derailleur. However, the actions of resisting the torsion and inserting the fixed pin need to be performed by the user at the same time, which reduces the convenience of disassembly and assembly of the rear derailleur. Therefore, how to allow users to easily disassemble and assemble the rear derailleur is actually one of the problems to be solved urgently by researchers in this field.

The present invention is to provide a bicycle rear derailleur, so as to solve the problem that in the process of disassembling and assembling the rear derailleur described in the prior art, the user needs to perform the actions of resisting the torsion force and inserting the fixed pin at the same time, which reduces the convenience of disassembly and assembly of the rear derailleur The problem.

A bicycle rear derailleur disclosed in an embodiment of the present invention is suitable for being fixed to a frame and includes a fixed member, a movable member, a connecting rod assembly, a chain guide member, a positioning member, and a guide member And a fixed part. The fixing member is used for fixing to the frame. The opposite ends of the connecting rod assembly are respectively pivoted on the fixed member and the movable member. The chain guide member is pivoted on the movable member. The positioning piece is connected to the movable member. The guide is arranged on the movable member, and the guide can move between an initial position and a guide position. The fixing part is rotatably arranged on the chain guide member. When the guiding member is located at the initial position and the fixing member is driven by the chain guide member, the fixing member moves along a first moving path, and the first moving path does not overlap the positioning member. When the guide is located at the guiding position and the fixed part is driven by the chain guide member, the fixed part is guided by the guide to move along a second moving path that is different from the first moving path, and is locked in Positioning pieces.

According to the bicycle rear derailleur of the above embodiment, since the guide at the initial position allows the fixed part driven by the chain guide member to move along the first movement path, and the guide at the guide position can be guided by the chain The fixing piece driven by the component moves along the second moving path and is fastened to the fixing piece. Therefore, the user only needs to adjust the guide piece from the initial position to the guiding position to allow the driven fixing piece to be fastened to the positioning piece. To fix the position of the chain guide member to facilitate subsequent removal of the bicycle rear derailleur from the frame.

Please refer to Figure 1 to Figure 3. Fig. 1 is a perspective schematic view of a bicycle rear derailleur according to a first embodiment of the present invention. Fig. 2 is an exploded schematic diagram of Fig. 1. Fig. 3 is a schematic partial cross-sectional view of Fig. 1.

This embodiment discloses a bicycle rear derailleur 1. The bicycle rear derailleur 1 includes a fixed member 10, a link assembly 20, a movable member 30, a chain guide member 40, a pivot post 50, three elastic members 61, 62, 63, a positioning member 70, and a guide The lead 80, a bolt 90, a fixing member 100 and a fixing rod 110.

The fixing member 10 is used for fixing to a frame 2 of the bicycle. The connecting rod assembly 20 includes a first connecting rod 21 and a second connecting rod 22. Two opposite ends of the first link 21 are pivoted to the fixed member 10 and the movable member 30 respectively, and two opposite ends of the second link 22 are pivoted to the fixed member 10 and the movable member 30 respectively. In this embodiment, the fixed member 10, the movable member 30, the first connecting rod 21 and the second connecting rod 22 are four-bar linkage structures. In this embodiment, the movable member 30 has an outer surface 31.

The chain guide member 40 includes a frame 41, a guide sprocket 42 and a force wheel 43. The guide sprocket 42 and the tension wheel 43 are both pivoted on the frame body 41, and the frame body 41 is pivoted on the movable member 30 through the pivoting column 50. Two opposite ends of the elastic member 61 are respectively fixed to the movable member 30 and the frame 41 of the chain guide member 40, and the elastic member 61 is used to impart a torque to the chain guide member 40 relative to the movable member 30. When the bicycle rear derailleur 1 is fixed to the frame 2 and the bicycle chain (not shown) is hung on the guide sprocket 42 and the tension wheel 43, the chain guide member 40 will oppose the movable member 30 along the torque direction D1 Pivoting, the tension wheel 43 is allowed to tighten the bicycle chain.

The positioning member 70 includes a first extension portion 71 and a second extension portion 72 connected to each other. The first extension 71 is connected to the outer surface 31 of the movable member 30, and the first extension 71 and the second extension 72 respectively extend along the radial and axial directions of the pivot axis P1 of the chain guide member 40. The second extension portion 72 has an inner side surface 721, an outer side surface 722, a positioning groove 723, a first end edge 724 and a second end edge 725. The inner side surface 721 faces the outer surface 31 of the movable member 30, and the outer side surface 722 faces away from the inner side surface 721. The notch of the positioning groove 723 faces away from the movable member 30, and the positioning groove 723 is located between the first end edge 724 and the second end edge 725. In this embodiment, the first end edge 724 is farther away from the movable member 30 than the second end edge 725.

The guiding member 80 includes an assembly post 81, a handle 82 and a guiding block 83. The handle 82 includes a pulling portion 821, a connecting portion 822 and a protruding portion 823. The assembly post 81 and the pulling portion 821 are respectively connected to two opposite sides of the connecting portion 822, and the guiding block 83 and the connecting portion 822 are respectively connected to two opposite sides of the pulling portion 821. The assembly column 81 is rotatably installed on the movable member 30. The connecting portion 822 has an outer wall surface 8221, and the protruding portion 823 protrudes from the outer wall surface 8221 of the connecting portion. In this embodiment, the guiding block 83 has a first surface 831, a second surface 832, and a third surface 833 facing different directions. The bolt 90 passes through the elastic member 62 and is locked to the movable member 30. One end of the elastic element 62 is fixed to the movable member 30, and the adjacent two sides of the other end of the elastic element 62 abut the outer wall surface 8221 and the protrusion 823.

The fixing member 100 includes a rotating arm 1010 and a fixing block 1020. The fixed rod 110 penetrates one end of the rotating arm 1010 and the elastic member 63 and is fixed to the frame 41 of the chain guiding member 40, and the rotating arm 1010 can rotate relative to the chain guiding member 40. The fixing block 1020 protrudes from the other end of the rotating arm 1010 in a direction parallel to the axis of the fixing rod 110. Two opposite ends of the elastic member 63 are respectively fixed to the rotating arm 1010 and the frame 41 of the chain guide member 40, and the elastic member 63 is used to apply a torque to the rotating arm 1010 to swing toward the movable member 30.

In this embodiment, the guiding member 80 can move between an initial position and a guiding position.

As shown in FIG. 3, when the guide member 80 is in the initial position, the first surface 831 of the guide block 83 faces the outer surface 31 of the movable member 30, and the second extension portion is located between the first surface 831 and the outer surface 31 The inner surface 721 and the outer surface 31 of the 72 jointly form a first movable path A1 that does not overlap with the positioning member 70 (as shown in FIG. 1 ). At this time, the width W of the fixed block 1020 is smaller than the distance L1 between the first surface 831 of the guide block 83 and the outer surface 31 of the movable member 30. In this way, when the bicycle rear derailleur 1 (as shown in FIG. 1) is shifted, the chain guide member 40 swinging under the tension of the bicycle chain will drive the fixed block 1020 to move in the first moving path A1.

Next, please refer to Figures 4 and 5. Fig. 4 is a partial cross-sectional view of the guide member of Fig. 3 at a guiding position. Fig. 5 is a schematic partial cross-sectional view of the fixing block of Fig. 4 in the positioning groove.

As shown in FIG. 4, the pulling portion 821 can be pulled in the direction D2 to move from the initial position to the guiding position. When the guide member 80 is at the guiding position, the second surface 832 of the guide block 83 faces the outer surface 31 of the movable member 30, and the third surface 833 of the guide block 83 is aligned with the outer side surface 722 of the second extension 72 , So that the third surface 833 and the outer side surface 722 are far away from the movable member 30 to form a second movable path A2. At this time, the width W of the fixed block 1020 is greater than the distance between the second surface 832 of the guide block 83 and the outer surface 31 of the movable member 30 (the second surface 832 is almost close to the outer surface 31). Next, as shown in FIG. 5, the chain guide member 40 is pulled in the direction D3 (that is, the reverse of the direction D1), and the fixed block 1020 is moved along the second moving path A2. Since the width W of the fixed block 1020 (as shown in FIG. 4) is greater than the distance between the second surface 832 of the guide block 83 and the outer surface 31 of the movable member 30, the moving fixed block 1020 will be affected by the second surface of the guide block 83. The three surfaces 833 and the outer side surface 722 of the second extension portion 72 are guided and fixed to the positioning groove 723. In this way, the position of the chain guide member 40 is fixed, and the bicycle chain has been loosened, which facilitates the removal of the bicycle rear derailleur 1 shown in FIG. 1 from the frame 2.

When the fixing block 1020 is locked in the positioning groove 723, the torque applied by the elastic member 61 to the chain guide member 40 will cause the fixing block 1020 to be located on the side of the positioning groove 723 adjacent to the first end edge 724, and the first The end edge 724 hooks the fixing block 1020. In this embodiment, since the first end edge 724 is farther away from the movable member 30 than the second end edge 725, the fixing block 1020 is located on the side of the positioning groove 723 adjacent to the first end edge 724, so that the fixing block 1020 can be more stable and fixed. Fastened to the positioning slot 723.

Next, please refer to Figure 6 and Figure 7. Fig. 6 is a partial cross-sectional view of the fixing block of Fig. 4 located on one side of the positioning groove adjacent to the second end edge. Fig. 7 is a schematic partial cross-sectional view of the fixed block of Fig. 3 in a first moving path.

When the user wants to release the fixed state of the chain guide member 40, first restore the guide member 80 to the initial position, and then pull the chain guide member 40 in the direction D3 to move the fixed block 1020 to the vicinity of the positioning slot 723 On one side of the second end edge 725. Then, the chain guide member 40 that continues to move in the reverse direction of the direction D3 causes the fixed block 1020 to be pressed by the second end edge 725 to escape the positioning groove 723, and the rotating arm 1010 is subjected to the torque provided by the elastic member 63. Let the fixed block 1020 return to the first moving path A1. Then, when the chain guide member 40 is released, the torque exerted by the elastic member 61 will cause the chain guide member 40 to drive the fixed block 1020 to return to the position shown in FIG. 3 along the first moving path A1.

According to the bicycle rear derailleur of the above embodiment, since the guide at the initial position allows the fixed part driven by the chain guide member to move along the first movement path, and the guide at the guide position can be guided by the chain The fixing part driven by the member moves along the second moving path to be clamped to the fixing part. Therefore, the user only needs to adjust the guide part from the initial position to the guiding position, and the fixing part driven by the chain guide member can be clamped. In the positioning part, the position of the chain guide member is fixed and the bicycle chain is loosened, so that the rear derailleur of the bicycle can be removed from the frame.

Although the present invention is disclosed in the foregoing embodiments as above, it is not intended to limit the present invention. Anyone familiar with similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection for inventions shall be determined by the scope of patent applications attached to this specification.

1: Bicycle rear derailleur 2: Frame 10: Fixed components 20: Connecting rod assembly 21: The first link 22: second link 30: Active component 31: Outer surface 40: Chain guide member 41: Frame 42: guide sprocket 43: Tension wheel 50: pivot post 61, 62, 63: elastic parts 70: positioning parts 71: first extension 72: second extension 721: inside 722: outside 723: positioning slot 724: first edge 725: second edge 80: guide 81: Assemble the column 82: handle 821: Flip part 822: Connection 8221: outer wall 823: protruding part 83: guide block 831: first surface 832: second surface 833: third surface 90: Bolt 100: fixed parts 1010: rotating arm 1020: fixed block 110: fixed rod D1, D2, D3: direction P1: axis A1, A2: path W: width L1: distance

Fig. 1 is a perspective schematic view of a bicycle rear derailleur according to a first embodiment of the present invention. Figure 2 is a partial exploded schematic view of Figure 1. Fig. 3 is a schematic partial cross-sectional view of Fig. 1. Fig. 4 is a partial cross-sectional view of the guide member of Fig. 3 at a guiding position. Fig. 5 is a schematic partial cross-sectional view of the fixing block of Fig. 4 located on one side of the positioning groove adjacent to the first end edge. Fig. 6 is a partial cross-sectional view of the fixing block of Fig. 4 located on one side of the positioning groove adjacent to the second end edge. Fig. 7 is a schematic partial cross-sectional view of the fixed block of Fig. 3 in a first moving path.

1: Bicycle rear derailleur

2: Frame

10: Fixed components

20: Connecting rod assembly

30: Active component

40: Chain guide member

70: positioning parts

71: first extension

72: second extension

D1: Direction

P1: axis

Claims (8)

A bicycle rear derailleur, suitable for being fixed to a frame, comprising: A fixing member for fixing to the frame; A movable component; A connecting rod assembly, the opposite ends of the connecting rod assembly are respectively pivoted on the fixed member and the movable member; A chain guide member pivoted on the movable member; A positioning piece connected to the movable member; A guiding piece is arranged on the movable member, and the guiding piece is movable between an initial position and a guiding position; and A fixing piece rotatably arranged on the chain guide member; Wherein, when the guide member is located at the initial position and the fixing member is driven by the chain guide member, the fixing member moves along a first moving path, and the first moving path does not overlap the positioning member, when When the guide member is located at the guiding position and the fixing member is driven by the chain guide member, the fixing member is guided by the guide member to move along a second movement path different from the first movement path , And clamped to the positioning piece. For the bicycle rear derailleur described in item 1 of the scope of patent application, the guide member includes an assembly post, a handle, and a guide block. The assembly post and the guide block are respectively connected to two opposite sides of the handle. The assembly column is rotatably installed on the movable member, the positioning member includes a first extension portion and a second extension portion connected to each other, the first extension portion is connected to the movable member, and the first extension portion and the second extension portion The two extensions respectively extend along the radial direction and the axial direction of the pivot axis of the chain guide member. When the guide member is in the initial position, the first moving path is formed between the guide block and the movable member Between the second extension part and the movable member, when the guide member is located at the guiding position, the second movable path is formed at one of the guide block and the positioning member away from the movable member On the other hand, when the guiding member is located at the guiding position and the fixing member is driven by the chain guiding member, the fixing member is guided by the guiding block. The bicycle rear derailleur described in item 2 of the scope of patent application, wherein the movable member has an outer surface, the guide block has a first surface, a second surface, and a third surface facing different directions. The two extension parts have an inner side surface and an outer side surface opposite to each other. The inner side surface faces the movable member. When the guide is in the initial position, the first surface faces the outer surface of the movable member. A path is formed between the first surface and the outer surface, and between the inner side surface and the outer surface. When the guide is at the guiding position, the second surface faces the outer surface of the movable member , The third surface is aligned with the outer side surface of the second extension portion, and the second moving path is formed on a side of both the third surface and the outer side surface away from the movable member, when the guide is located at the When the guiding position and the fixing part are driven by the chain guide member, the fixing part is guided by the third surface and the outer surface. The bicycle rear derailleur described in item 2 of the scope of patent application further includes an elastic member, one end of the elastic member is fixed to the movable member, and the other end of the elastic member abuts against the handle of the guide member. The bicycle rear derailleur described in item 4 of the scope of patent application, wherein the handle includes a pull portion, a connecting portion and a protruding portion, and the assembly column and the pull portion are respectively connected to two opposite sides of the connecting portion , The guiding block and the connecting portion are respectively connected to two opposite sides of the flipping portion, the connecting portion has an outer wall surface, the protruding portion protrudes from the outer wall surface of the connecting portion, and one end of the elastic member The two adjacent sides abut against the outer wall surface and the protruding part. For example, the bicycle rear derailleur described in item 2 of the scope of patent application further includes a fixed rod. The fixed part includes a rotating arm and a fixed block. The fixed rod penetrates one end of the rotating arm and is fixed to the chain guide. Member, the fixed block protrudes from the other end of the rotating arm in a direction parallel to the axis of the fixed rod, the second extension has a positioning groove, when the guide is at the initial position, the width of the fixed block Is smaller than the distance between the guide block and the movable member. When the guide is at the guiding position, the width of the fixed block is greater than the distance between the guide block and the movable member. When the guide When the fixing piece is at the guiding position and the fixing piece is driven by the chain guiding member, the fixing block is guided by the guiding block and the second extension part to be clamped in the positioning groove. According to the bicycle rear derailleur described in claim 6, wherein the second extension portion has a first end edge and a second end edge opposite to each other, and the positioning groove is located at the first end edge and the second end edge In between, the first end edge is farther away from the movable member than the second end edge. When the fixed block is clamped to the positioning groove, the fixed block is located on a side of the positioning groove adjacent to the first end edge. For example, the bicycle rear derailleur described in item 6 of the scope of patent application further includes an elastic member. The opposite ends of the elastic member are respectively fixed to the rotating arm and the chain guide member, and the elastic member is used to apply to the rotating arm A torque that swings toward the movable member.

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