TW202311109A - Rear derailleur of a bicycle - Google Patents

Abstract

A bicycle rear derailleur, comprising: a first body with a first connecting portion and a first base, the first connecting portion is fixed to a frame; a second body with a second connecting portion and a second base; a link mechanism with a first link, one end of which is movably connected to the first base, and the other end is pivotally connected to the second base; a driving device, connected the link mechanism can drive the link mechanism to move the second body relative to the first body between a first position and a second position; and a chain guide set connected to the second connecting portion, move with the second body.

Description

bicycle rear derailleur

The invention relates to the technical field of bicycles, in particular to a bicycle rear derailleur.

The transmission system of a traditional bicycle includes a chain guide set and a chainring set wound around a rear derailleur. During the riding process, in order to respond to different terrain fluctuations, the user can adjust the transmission and switch the chain to connect to different chainrings to achieve the effect of speed change. When changing gears, a metal wire is operated to pull the rear derailleur to move, thereby changing the positions of the different chainrings where the chain is wound on the flywheel.

Electric rear derailleurs have appeared on the market today, which are mainly driven by motors, and use the combination of gears and racks to make the rear derailleur moveable, thereby driving a chain to change between the different sizes of the bicycle chainrings. The operation mode of the rear derailleur can be wired electrical operation, and can also be controlled by wireless signals. However, because the displacement distance of the rear derailleur is limited by the length of the gear row, a rear derailleur with a combined structure of gears and gear rows needs to have a large volume to meet the displacement distance requirement of the rear derailleur.

In addition, the smoothness of the rear derailleur when shifting gears also has a great impact on the user's riding experience, especially when encountering poor road conditions, the structure of the rear derailleur may affect the chain and chainring due to excessive shaking The degree of meshing, which will lead to the situation of jamming when going up and down the chain, or the failure of the up and down chain, which will have a bad impact on the riding experience, and even need to add additional adjustments to the chain and rear derailleur burden.

Therefore, the object of the present invention is to provide a bicycle rear derailleur, which has the effects of a smooth actuation structure and a small volume.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a bicycle rear derailleur, comprising: a first main body having a first connecting portion and a first base, the first connecting portion is fixed on a vehicle frame; a first Two main bodies have a second connecting portion and a second base; a linkage mechanism has a first connecting rod, one end of which is movably connected to the first base, and the other end is pivotally connected to the first base The second base; the link mechanism has a second link, one end of which is movably connected to the second base, and the other end is pivotally connected to the first base; the first and the second The connecting rods are pivotally connected to each other at the middle position; a driving device is arranged on one of the first main body and the second main body and is connected with the connecting rod mechanism; the driving device drives the connecting rod mechanism to make the second connecting rod mechanism The two main bodies move between a first position and a second position relative to the first main body; when the second main body moves from the first position to the second position, the second main body faces away from the first main body direction; when the second body moves from the second position to the first position, the second body moves towards the direction approaching the first body; and a chain guide group, connected to the second body of the second body The two connecting parts move together with the second body.

In one embodiment, the first base of the first body has a first chute; the second base of the second body has a second chute; one end of the first connecting rod is connected to the first chute, and can move along the first chute; one end of the second connecting rod is connected to the second chute, and can move along the second chute.

In one embodiment, the first base of the first main body has a first accommodating space, and the first sliding groove communicates with the first accommodating space; one end of the first connecting rod enters the first accommodating space After the space, it is connected to the first chute in a movable manner.

In one embodiment, the second base of the second main body has a second accommodating space, and the second chute communicates with the second accommodating space; one end of the second connecting rod enters the second accommodating space After space, it is connected to the second chute in a movable manner.

In one embodiment, the link mechanism further has a pivot and a clutch device; the pivot passes through the first and the second connecting rod, so that the first and the second connecting rod are pivotally connected together The clutch device connects the pivot and the first connecting rod, and when the bicycle rear transmission is hit, the first connecting rod and the second connecting rod are clutched to avoid damage to the driving device.

In one embodiment, the clutch device has a fixed end and a resisting section; the fixed end is connected to the first connecting rod, so that the resisting section presses against the pivot.

In one embodiment, a groove is provided on the first connecting rod, and a slot hole is provided on the bottom surface of the groove; the fixed end of the clutch device is inserted into the slot hole.

In one embodiment, a groove is provided on the pivot shaft, and the resisting section of the clutch device is located in the groove.

In one embodiment, the driving device has a motor and a drive shaft; the drive shaft pivotally connects the second connecting rod to the first base of the first body; the motor is arranged on the first body and connected to The drive shaft is used to drive the second connecting rod to rotate.

According to the purpose, function and structural configuration of the present invention, the preferred embodiments are listed below and described in detail in conjunction with the drawings.

Please refer to Fig. 1, a preferred embodiment of the present invention discloses a bicycle rear derailleur, comprising: a first main body 10, a second main body 20, a link mechanism 30, a driving device 40 and a guide chain device group 50.

Please refer to FIG. 2 , the first body 10 has a first connecting portion 11 and a first base 12 . The first connecting portion 11 has a substantially circular first column 111 and a connecting plate 113 extending outward from the first column 111 . A frame connecting hole 112 is defined on the first column 111 . The width of the connecting plate 113 gradually increases outward from the first column 111 , and is connected to the first base 12 . The first base 12 is generally rectangular and has a first chute 121 , a first shaft hole 122 and a first accommodating space 123 , the first chute 121 and the first shaft hole 122 are arranged in a straight line, The first accommodating space 123 has an opening and communicates with the first slide slot 121 and the first shaft hole 122 .

The second body 20 has a second connecting portion 21 and a second base 22 . The second connecting portion 21 has a generally circular second column 211 . The second column 211 defines a chain guide connecting hole 212 for connecting with the chain guide set 50 , and the second connecting portion 21 is connected to the second base 22 . The second base 22 is substantially rectangular and has a second chute 221 , a second shaft hole 222 and a second accommodating space 223 , the second chute 221 is aligned with the second shaft hole 222 , The second accommodating space 223 has an opening and communicates with the second slide slot 221 and the second shaft hole 222 .

The link mechanism 30 has a first link 31 , a second link 32 , two movable shafts 33 , a fixed shaft 34 , a pivot 35 and a clutch device 36 . The first connecting rod 31 has a pivot hole 311, two grooves 312, two slot holes 313, a first end 314, and a second end 315. The pivot hole 311 is a long hole in a rounded rectangle. Roughly located at the center of the first connecting rod 31, the two grooves 312 are approximately rectangular, and their long axis is parallel to the long axis of the pivot hole 311, and are located on both sides of the pivot hole 311 respectively. The slots 313 are generally circular holes and are respectively located on the bottom surfaces of the two grooves 312 .

The second connecting rod 32 has a shaft seat hole 321 , a first end 322 and a second end 323 . The shaft seat hole 321 is a circular hole approximately located at the center of the second connecting rod 32 . The two movable shafts 33 pass through the first end 314 of the first connecting rod 31 and the first end 322 of the second connecting rod 32 respectively, and the two movable shafts 33 respectively enter the first sliding groove 121 and the second connecting rod 32 . The sliding slot 221 enables the first end 314 of the first connecting rod 31 and the first end 322 of the second connecting rod 32 to slide in the first sliding slot 121 and the second sliding slot 221 respectively. The fixed shaft 34 passes through the second end 315 of the first connecting rod 31, and the fixed shaft 34 enters the second shaft hole 222, so that the second end 315 of the first connecting rod 31 is fixed in the second shaft hole 222 within.

The pivot 35 has a shaft 351 and a shaft seat 353, the top of the shaft 351 has two grooves 352, the shaft 351 is an elongated cylinder, passes through the pivot hole 311 and the shaft seat 353, and partially enters The shaft seat hole 321 ; the shaft seat 353 is a bearing, which is disposed in the shaft seat hole 321 . The pivot 35 fixes the central position of the first connecting rod 31 and the second connecting rod 32, so that the first connecting rod 31 and the second connecting rod 32 are in a pivoted state, and have a linked motion relationship. The driving device 40 is driven to generate relative displacement, and drives the second body 20 to form a relative relationship between opening and closing with the first body 10 . The clutch device 36 has two elastic bodies 37, and each of the two elastic bodies 37 has two fixed ends 371 with a predetermined distance and a resisting section 372, and the two fixed ends 371 are respectively inserted into the two slots 313, and the resisting The section 372 is generally V-shaped and is located between the two fixed ends 371 and connected to the two fixed ends 371. The abutting sections 372 of the two elastic bodies 37 respectively abut against the two grooves 352 on the shaft 351, When the rear derailleur of the bicycle is hit, the first connecting rod 31 and the second connecting rod 32 are disengaged to prevent the driving device 40 from being damaged, and the pivot 35 is limited to the pivot hole 311 .

The driving device 40 includes a motor 41 , a gear set 42 and a driving shaft 43 , and the driving device 40 is connected with the link mechanism 30 . The motor 41 has a worm 411, the worm 411 meshes with the gear set 42, the gear set 42 has a first gear 421 and a second gear 422, the drive shaft 43 has a reduction gear 431 and a drive shaft 432 , the reduction gear 431 meshes with the gear set 42, and the drive shaft 432 is a generally circular long column, connected to the reduction gear 431, and passes through the second end 323 of the second connecting rod 32, so that the The second link 32 can be rotated under the control of the driving device 40, and then drives the link mechanism 30, so that the second main body 20 is in a first position (Fig. 3) and a first position relative to the first main body 10. Move between two positions (Fig. 4).

The motor 41 of the driving device 40 can be realized by a suitable wired control method or a wireless control method. The wireless control method can install a wireless receiver on the driving device 40 and electrically connect the motor 41, and install a wireless transmitter on the handlebar to send a control signal to the wireless receiver, and then control the motor 41 to rotate forward and reverse To drive the link mechanism 30 and the chain guide set 50 . The above-mentioned wireless signal transmitted and received by the wireless transmitter and the wireless receiver includes but is not limited to a Bluetooth signal.

The chain guide set 50 includes a first guide rod 51 , a second guide rod 52 , a first guide wheel 53 and a second guide wheel 54 . The first guide rod 51 and the second guide rod 52 are pivotally connected to each other so that the first guide rod 51 and the second guide rod 52 can rotate relative to each other. The first guide rod 51 includes two opposite first rod bodies 511 , and the first guide wheel 53 is rotatably installed between the two opposite first rod bodies 511 . The second guide rod 52 includes two opposite second rod bodies 521 , and the second guide wheel 54 is rotatably installed between the two opposite second rod bodies 521 .

When the motor 41 rotates in the forward direction, the second main body 20 can be driven from the second position to the first position through the link mechanism 30. At this time, the first end 314 of the first link 31 moves along the The first chute 121 moves away from the second end 323 of the second connecting rod 32; and the first end 322 of the second connecting rod 32 moves away from the first connecting rod 31 along the second chute 221 The movement of the second end 315 makes the second body 20 move toward the direction approaching the first body 10 . When the second body 20 reaches the first position ( FIG. 3 ), the first base 12 of the first body 10 contacts the second base 22 of the second body 20 .

When the motor 41 rotates in reverse, it can drive the second body 20 to move from the first position to the second position. At this time, the first ends 314, 322 of the first and the second connecting rods 31, 32 approach the second and the first connecting rods 32, 31 along the first and the second slide grooves 121, 221 respectively. The direction of the second end 323, 315 moves, causing the second body 20 to move away from the direction of the first body 10 to reach the second position (Fig. 4). At this time, the first and the second The first ends 314, 322 of the connecting rods 31, 32 respectively reach the positions where the first and the second slide grooves 121, 221 are closest to the second ends 323, 315 of the second and the first connecting rods 32, 31.

Please refer to FIG. 5, when the second body 20 is at the first position, the chain guide set 50 is the closest to the first body 10, and at this time, one of the chains 70 of the chain guide set 50 is bypassed. Linked on the smallest chainring of the flywheel 80; please refer to the 6th figure, when the link mechanism 30 is driven by the driving device 40 to make the second body 20 reach the second position, the second body 20 and The first main body 10 reaches the maximum distance that can be opened, and the distance between the chain guide set 50 and the first main body 10 is the farthest. At this time, the chain 70 is connected to the largest chainring of the flywheel 80 . Through the displacement of the second main body 20 between the first position and the second position, the chain 70 can be freely linked with any chainring on the flywheel 80 .

Based on the above contents, it can be known that the combination of the first connecting rod 31 and the second connecting rod 32 can provide a larger displacement distance for the chain guide group 50, or satisfy the displacement distance of the chain guide group 50 Under the requirements, the combination of the first link 31 and the second link 32 can make the link mechanism 30 have a smaller volume, and the first link 31 and the second link 32 are synchronously linked The displacement method can provide the chain guide set 50 to switch between different chainrings smoothly.

The above are the preferred embodiments and design drawings of the present invention, but the preferred embodiments and design drawings are only for illustration and are not used to limit the scope of rights of the technology of the present invention. The implementation of the scope of rights covered by the content of the "application patent scope" does not depart from the scope of the present invention and is the applicant's scope of rights.

10: The first subject 11: The first connecting part 111: the first column 112: Frame connecting hole 113: Connecting plates 12: The first base 121: The first chute 122: The first shaft hole 123: The first storage space 20: Second subject 21: The second connecting part 211: the second column 212: Chain guide connecting hole 22:Second base 221: Second chute 222: Second shaft hole 223: Second storage space 30: Linkage 31: The first connecting rod 311: pivot hole 312: Groove 313: slot 314: first end 315: second end 32: Second connecting rod 321: Shaft seat hole 322: first end 323: second end 33: Active axis 34: fixed axis 35: Pivot 351: shaft 352: Groove 353: shaft seat 36: clutch device 37:Elastomer 371: fixed end 372: Top Arrival Section 40: drive device 41: motor 411: worm 42: gear set 421: first gear 422: second gear 43: drive shaft 431: reduction gear 432: drive shaft 50:Chain guide set 51: The first guide rod 511: the first rod body 52: Second guide rod 521: second rod body 53: The first guide wheel 54: Second guide wheel 60: frame 70: chain 80: flywheel

Figure 1 is a perspective view of a preferred embodiment of the present invention. Fig. 2 is an exploded view of a preferred embodiment of the present invention. Fig. 3 is a schematic diagram of a preferred embodiment of the present invention, showing that the second body is located at the first position. Fig. 4 is a schematic diagram of a preferred embodiment of the present invention, showing that the second body is located at the second position. Fig. 5 is a schematic diagram of a preferred embodiment of the present invention, showing the position of the chain guide group when the chain is combined with the smallest chainring. Fig. 6 is a schematic diagram of a preferred embodiment of the present invention, showing the position of the chain guide group when the chain is combined with the largest chainring.

10: The first subject

20: Second subject

30: Linkage

40: drive device

50:Chain guide set

Claims (9)

A bicycle rear derailleur comprising: A first main body has a first connecting portion and a first base, and the first connecting portion is fixed on a vehicle frame; A second main body has a second connecting portion and a second base; A link mechanism has a first link, one end of which is movably connected to the first base, and the other end is pivotally connected to the second base; the link mechanism has a second link, One end is movably connected to the second base, and the other end is pivotally connected to the first base; the first and second connecting rods are pivotally connected to each other at the middle position; A driving device is arranged on one of the first main body and the second main body, and is connected to the linkage mechanism; the driving device drives the linkage mechanism so that the second main body is in a Move between a position and a second position; when the second body moves from the first position to the second position, the second body moves away from the first body; when the second body moves from the first position When the second position moves toward the first position, the second body moves towards the direction approaching the first body; and A chain guide group is connected to the second connecting portion of the second body and moves together with the second body. According to the bicycle rear derailleur described in claim 1, wherein the first base of the first main body has a first sliding slot; the second base of the second main body has a second sliding slot; the first connecting rod One end is connected to the first chute and can move along the first chute; one end of the second connecting rod is connected to the second chute and can move along the second chute. According to the bicycle rear derailleur described in claim 2, wherein the first base of the first main body has a first accommodation space, the first sliding groove communicates with the first accommodation space; one end of the first connecting rod After entering the first accommodating space, it is connected to the first chute in a movable manner. According to the bicycle rear derailleur described in claim 2, wherein the second base of the second body has a second accommodating space, the second chute communicates with the second accommodating space; one end of the second connecting rod After entering the second accommodating space, it is connected to the second chute in a movable manner. According to the bicycle rear derailleur described in claim 1, wherein the linkage mechanism further has a pivot and a clutch device; the pivot passes through the first and the second linkage, so that the first and the second linkage The rods are pivotally connected together; the clutch device connects the pivot shaft and the first connecting rod, and when the rear derailleur of the bicycle is impacted, the first connecting rod and the second connecting rod are clutched to prevent the driving device from being damaged. According to the bicycle rear derailleur described in claim 5, wherein the clutch device has a fixed end and an abutting section; the fixed end is connected to the first connecting rod, so that the abutting section presses against the pivot. According to the bicycle rear derailleur described in claim 6, a groove is formed on the first connecting rod, and a slot hole is formed on the bottom surface of the groove; the fixed end of the clutch device is inserted into the slot hole. According to the bicycle transmission described in claim 6, a groove is provided on the pivot shaft, and the abutting section of the clutch device is located in the groove. According to the bicycle transmission described in claim 1, wherein the driving device has a motor and a driving shaft; the driving shaft pivotally connects the second connecting rod to the first base of the first body; the motor is arranged on the second A main body is connected with the driving shaft so as to drive the second connecting rod to rotate.

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