TW202009173A - Bicycle rear derailleur - Google Patents

Abstract

A bicycle rear derailleur is adapted to be mounted a bicycle frame and near a wheel. The bicycle rear derailleur includes a fixing component, a movable component, a link assembly, an elastic component and a driving component. The fixing component and the movable component are respectively configured to be fixed to the bicycle frame and assembled with a chain guidance assembly. The link assembly includes a first link and a second link. Two ends of the first link are respectively pivoted to the fixing component and the movable component, and two ends of the second link are respectively pivoted to the fixing component and the movable component. Two opposite ends of the elastic component are respectively disposed on the link assembly and one of the movable component and the fixing component. The driving assembly includes a rotated component, a contact component and a driving source. The rotated component and the contact component are disposed on the movable component or the fixing component, and the contact component is normally in contact with the rotated component. The driving source is disposed on the link assembly and configured to rotate the rotated component so as to move the movable component toward or backward the wheel via the contact component.

Description

Bicycle rear derailleur

The invention relates to a bicycle rear derailleur, in particular to a bicycle rear derailleur with a buffer mechanism to prevent the drive motor from being damaged by external force.

In recent years, the bicycle market has developed vigorously. Whether it is a competitive high-end bicycle or a popular bicycle as a walking tool and leisure entertainment, consumers have loved it, prompting manufacturers to pay more attention to the needs of users for bicycle functions. The body materials and equipment functions are constantly improved. Generally speaking, the bicycle system is provided with a front chainring and a rear flywheel, and a chain is hung to connect the two. The user steps on the pedal to rotate the front chainring, and drives the rear flywheel to rotate through the chain, and drives the rear wheel to advance the bicycle. In addition, bicycles are often equipped with a transmission for the user to adjust the degree of effort for pedaling. Specifically, the bicycle transmission includes a front derailleur and a rear derailleur, which are used to control the position of the chain on the front sprocket and the rear flywheel, respectively. The gear ratio of the front chainring and the rear flywheel is adjusted by shifting gears, so as to achieve the purpose of adjusting the degree of labor saving of pedaling.

In the future, as an example of the transmission, in addition to the conventionally known mechanical rear derailleur, many bicycles also gradually adopt an electronic rear derailleur. The electronic rear derailleur uses the motor as a power source to control the relative pivoting of the four links of the rear derailleur, and then drives the rear derailleur to move to switch gears. However, because the rear derailleur of the bicycle is exposed outside the vehicle body, once the rear derailleur is impacted, the impact force will be transmitted to the motor through the connecting rod, making the motor vulnerable to damage. Therefore, the problem that the motor is easily damaged after the rear derailleur is impacted is indeed one of the problems that R&D personnel in the field need to solve urgently.

The invention is to provide a bicycle rear derailleur, so as to solve the problem that the motor described in the prior art is easily damaged after the rear derailleur is impacted.

A bicycle rear derailleur disclosed in an embodiment of the present invention is suitable for being mounted on a frame and adjacent to a wheel, and combined with a chain guide member. The bicycle rear derailleur includes a fixed member, a movable member, a connecting rod assembly, an elastic return member and a driving assembly. The fixed member is used to be fixed to the vehicle frame, and the movable member is used to combine with the chain guide member. The link assembly includes a first link and a second link. The two ends of the first link are respectively pivoted to the fixed member and the movable member, and the two ends of the second link are respectively pivoted to the fixed member and the movable member. One end of the elastic return member is disposed on the movable member or the fixed member, and the other end of the elastic reset member is disposed on the first link or the second link. The driving component includes a pushing member, a pushed member and a power source. The pushing piece is pivotally arranged on the movable member or the fixed member. The pushed member is fixed to the movable member or the fixed member, and the pushed member receives the elastic force of the elastic reset member and normally abuts against the pushed member. The power source is disposed on the first link or the second link. The power source is used to drive the pushing member to rotate, and the movable member is driven toward or away from the wheel through the pushed member.

According to the bicycle rear derailleur of the above embodiment, when the bicycle rear derailleur is impacted by an external force, the movable member will move toward the wheel to separate the thrust member from the thrust member, so the impact force will not be transmitted through the thrust member and the thrust member To power source. Therefore, the probability of the power source being damaged when the rear derailleur of the bicycle is hit by an external force can be reduced.

Please refer to Figure 1. 1 is a schematic plan view of a bicycle rear derailleur mounted on a frame according to the first embodiment of the invention.

The bicycle rear derailleur 10 of this embodiment is suitable for being mounted on a frame 20 and adjacent to a wheel 30 of the bicycle. The wheel 30 is, for example, a rear wheel of a bicycle, and a flywheel group 40 is provided between the wheel 30 and the frame 20. The flywheel group 40 has a plurality of wheels with different sizes, and the wheels are arranged in order according to the size. Among them, the smallest-sized wheel is closest to the frame 20, and the largest-sized wheel is closest to the wheel 30.

Next, please refer to FIGS. 1 to 3. FIG. 2 is a schematic perspective view of the bicycle rear derailleur of FIG. 1. FIG. 3 is an exploded schematic diagram of FIG. 2.

The bicycle rear derailleur 10 includes a fixed member 100, a movable member 200, a connecting rod assembly 300, an elastic reset member 400, a driving assembly 500, a battery 600, a control board 700 and a signal receiver 800.

The fixed member 100 is used to be fixed to the frame 20, and the movable member 200 is used to be combined with a chain guide member 50. The chain guide member 50 has a chain sprocket 51 and a force wheel 52. The chain sprocket 51 and the tension wheel 52 are used to guide a bicycle chain (not shown).

The link assembly 300 includes a first link 310, a first pivot post 320, a second pivot post 330, a second link 340, a third pivot post 350 and a fourth pivot post 360 .

The first link 310 has a first pivotal portion 311 and a second pivotal portion 312. The first pivotal portion 311 is pivotally disposed on the fixing member 100 through the first pivotal post 320, and the second pivotal portion 312 is transmitted through the first The second pivot post 330 is pivotally disposed on the movable member 200. The second link 340 has a third pivotal portion 341 and a fourth pivotal portion 342, the third pivotal portion 341 is pivotally disposed on the fixing member 100 through the third pivotal post 350, and the fourth pivotal portion 342 is transmitted through the first The four pivot posts 360 are pivotally disposed on the movable member 200. Thereby, the fixed member 100, the movable member 200, the first link 310 and the second link 340 form a four-link structure. In the case where the fixing member 100 is mounted on the frame 20, the second link 340 is closer to the wheel 30 than the first link 310, and the movable member 200 can swing toward or away from the fixing member 100 through the link assembly 300.轮30。 Wheel 30.

The elastic reset member 400 is, for example, a torsion spring. The elastic reset member 400 includes a coiled portion 410, a first torsion arm portion 420 and a second torsion arm portion 430. The first torsion arm portion 420 and the second torsion arm portion 430 are respectively connected to opposite sides of the winding portion 410. The winding portion 410 is sleeved on the first pivot post 320, and the first torsion arm portion 420 is fixed to the first link 310, and the second torsion arm portion 430 is fixed to the fixing member 100.

The driving assembly 500 includes a pushing member 510, a pushed member 520, and a power source 530. The pushing member 510 includes an assembly portion 511 and a pushing portion 512 connected to each other, and the assembly portion 511 is pivotally disposed between the movable member 200 and between the movable member 200 and the fourth pivot portion 342 of the second link 340. In detail, the assembling portion 511 of the pushing member 510 is fixed to the fourth pivot post 360 and is pivotally mounted on the movable member 200 through the fourth pivot post 360.

The pushed member 520 is, for example, a positioning pin. The pushed member 520 penetrates the movable member 200, and a part of the pushed member 520 is located between the movable member 200 and the fourth pivotal portion 342 of the second link 340. In the case where the fixing member 100 is mounted on the frame 20, the elastic return member 400 will exert a force to swing the movable member 200 away from the wheel 30 via the fixing member 100, the first link 310 and the second link 340, In this way, the pushed member 520 normally abuts the pushing portion 512 of the pushing member 510.

In this embodiment, the first link 310 further has a first accommodating space 313, and the battery 600 is disposed in the first accommodating space 313. The second link 340 includes a first housing 343 and a second housing 344, and the first housing 343 and the second housing 344 together surround a second accommodating space 345. The third pivoting portion 341 and the fourth pivoting portion 342 of the second link 340 are both located in the first housing 343.

The first housing 343 of the second link 340 is made of metal, for example, and the second housing 344 is made of non-metal material, for example. The control motherboard 700 and the signal receiver 800 are disposed in the second accommodating space 345, and the battery 600 and the signal receiver 800 are electrically connected to the control motherboard 700. In this embodiment, the signal receiver 800 is adjacent to the first housing 343, and is used to receive a wireless control signal, for example, the wireless control signal is, for example, a shift signal. Since the second casing 344 made of non-metal material has the characteristic that the signal can pass through, the signal receiver 800 is arranged adjacent to the second casing 344 to ensure good signal reception quality of the signal receiver 800.

The power source 530 is disposed in the second accommodating space 345, and the power source 530 includes a motor 531 and a transmission component 532. The control board 700 is electrically connected to the motor 531, and the motor 531 has an output shaft 5311. The transmission assembly 532 includes a worm wheel 5321, a worm 5322, and a plurality of engaging gears 5323 that mesh with each other. In this embodiment, the fourth pivot post 360 is the first housing 343 penetrating the second link 340, and part of the fourth pivot post 360 is located in the second accommodating space 345. The worm gear 5321 is coaxially fixed to the fourth pivot post 360, and the worm 5322 is coaxially fixed to the output shaft 5311 of the motor 531, and a plurality of connecting gears 5323 connect the worm 5322 and the worm wheel 5321. When the control main board 700 receives the wireless control signal through the signal receiver 800, the control main board 700 drives the motor 531 to rotate, so that the fourth pivot post 360 rotates to drive the pushing member 510 to rotate, so that the pushed member 520 drives the movable member 200 swings relative to the fixed member 100 to adjust the position of the bicycle chain for shifting and shifting.

In detail, please refer to FIG. 1, FIG. 3 and FIG. 4 together. 4 is a schematic diagram of the operation of the rear derailleur of FIG. 2.

When the output shaft 5311 of the motor 531 rotates forward, the motor 531 drives the fourth pivot post 360 to rotate through the worm 5322, these connecting gears 5323, and the worm gear 5321, so that the pushing member 510 rotates along the direction D1 in FIG. 4 Pushed piece 520 moves in the same direction. At this time, in addition to pushing the pushed member 520, the movable member 200 can rotate in the direction D2 about the axis of the fourth pivot post 360, and the movable member 200 can swing relative to the fixed member 100, so that the movable member 200 moves in the direction of the wheel 30. In this way, the chain guide member 50 combined with the movable member 200 will be relatively close to the wheel 30, so that the bicycle chain is moved from the small plate 41 of the flywheel group 40 to the large plate 42 of the flywheel group 40 to switch gears .

Conversely, if the bicycle chain is to be moved from the large plate 42 of the flywheel set 40 to the small plate 41 of the flywheel set 40, the output shaft 5311 of the motor 531 is reversed, so that the pushing member 510 is reversed in the direction D1 Rotate to give room for the push member 520 to pivot in the reverse direction D2. In this way, the elastic force of the elastic return member 400 will swing the movable member 200 relative to the fixed member 100, so that the movable member 200 moves away from the wheel 30. In addition, the chain guide member 50 is driven by the movable member 200 to move the bicycle chain from the large plate 42 of the flywheel group 40 to the small plate 41 of the flywheel group 40.

Next, please refer to FIG. 1, FIG. 3 and FIG. 5 together. FIG. 5 is a schematic perspective view of the rear derailleur of FIG. 2 when it is impacted.

In this embodiment, when the bicycle falls over or is hit by another vehicle, and the bicycle rear derailleur 10 receives an impact force from the direction D3 (as shown in FIG. 1), the movable member 200 swings toward the wheel 30 and causes The pushing member 520 is separated from the pushing member 510, so that the impact force can be transmitted to the transmission component 532 and the motor 531 through the pushing member 520 and the pushing member 510, so as to ensure the worm wheel 5321, the worm 5322, the connecting gear 5323 and the motor 531 It will not be forced to rotate due to impact force. Therefore, the probability of the transmission assembly 532 and the motor 531 being damaged when the bicycle rear derailleur 10 is hit by an external force can be reduced.

In the above embodiment, the elastic return member 400 is disposed at the position where the first link 310 and the fixing member 100 are pivotally connected, so that the elastic return member 400 is shielded by the first link 310 and the fixing member 100 to make the bicycle rear The aesthetics of the transmission 10 is improved.

However, the installation position of the elastic return member 400 is not intended to limit the present invention. In other embodiments, the elastic return member can be repositioned at the pivotal connection between the first link and the movable member, the pivotal connection between the second link and the fixed member, or the pivotal connection between the second link and the fixed member Office. For example, when the elastic reset member is disposed at the pivotal connection between the first link and the movable member, the winding portion of the elastic reset member is sleeved on the second pivot post, and the first torsion arm portion and the second The torsion arm part is still fixed to the first link and the movable member respectively. However, when the elastic reset member is disposed at the pivotal connection between the second link and the fixing member, the first torsion arm portion and the second The torsion arm part is also fixed to the second link and the fixing member respectively. Similarly, when the elastic reset member is disposed at the pivotal connection between the second link and the movable member, the coiled portion of the elastic reset member is sleeved on the fourth pivot post, the first torsion arm portion and the second torsion arm The part is fixed to the second link and the movable member respectively.

In addition, the pushing member 510 and the pushed member 520 are respectively disposed on the movable member 200, but it is not limited thereto. In other embodiments, the pushing member and the pushed member can be disposed on the fixing member.

In addition, the transmission assembly 532 and the motor 531 of the battery 600 and the power source 530 are respectively disposed on the first link 310 and the second link 340, but it is not limited thereto. In other embodiments, the positions of the transmission components of the battery and the power source and the motor can be reversed.

According to the bicycle rear derailleur of the above embodiment, when the bicycle rear derailleur is impacted by an external force, the movable member moves toward the wheel to separate the thrust member from the thrust member, so the impact force can be transmitted through the thrust member and the thrust member To the transmission component and the motor, to ensure that the worm gear, worm, connecting gear and motor will not be forced to rotate due to the impact force. Therefore, the probability of the transmission component and the motor being damaged when the rear derailleur of the bicycle is hit by an external force can be reduced.

In addition, since the second casing made of non-metallic material has the characteristic that the signal can pass through, under the setting of the signal receiver adjacent to the second casing, the signal reception quality of the signal receiver can be ensured to be good.

In addition, the elastic reset member is disposed at the pivotal joint of the first link and the fixing member, so that the elastic reset member can be hidden, and the aesthetics of the rear derailleur of the bicycle is greatly improved.

Although the present invention is disclosed as above with the foregoing embodiments, it is not intended to limit the present invention. Any person familiar with similar arts can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of patent protection for inventions shall be subject to the scope defined in the patent application scope attached to this specification.

10‧‧‧Bike rear derailleur 20‧‧‧frame 30‧‧‧wheel 40‧‧‧flywheel group 41‧‧‧small plate 42‧‧‧large plate 50‧‧‧Chain guide member 51‧‧‧guide sprocket 52‧‧‧Tension wheel 100‧‧‧Fixed member 200‧‧‧Mobile member 300‧‧‧Link assembly 310‧‧‧First link 311‧‧‧First pivot 312‧‧‧Second pivot Part 313‧‧‧ First accommodating space 320‧‧‧ First pivot post 330‧‧‧ Second pivot post 340‧‧‧ Second link 341‧‧‧ Third pivot part 342‧‧‧ Four pivoting parts 343‧‧‧First housing 344‧‧‧Second housing 350‧‧‧‧Pivot post 360‧‧‧‧Pivot post 400‧‧‧Elastic reset member 410‧‧‧turns Winding part 420‧‧‧First torsion arm part 430‧‧‧Second torsion arm part 500‧‧‧Drive assembly 510‧‧‧ Pushing part 511‧‧‧Assembling part 512‧‧‧ Pushing part 520‧‧‧ Pushed part 530‧‧‧Power source 531‧‧‧Motor 5311‧‧‧ Output shaft 532‧‧‧ Transmission assembly 5321‧‧‧ Worm gear 5322‧‧‧ Worm 5323‧‧‧Coupling gear 600‧‧‧ Battery 700‧‧ ‧Control board 800‧‧‧Signal receiver D1, D2, D3 ‧‧‧ Direction

1 is a schematic plan view of a bicycle rear derailleur mounted on a frame according to the first embodiment of the invention. FIG. 2 is a schematic perspective view of the bicycle rear derailleur of FIG. 1. FIG. 3 is an exploded schematic diagram of FIG. 2. 4 is a schematic diagram of the operation of the rear derailleur of FIG. 2. 5 is a schematic perspective view of the bicycle rear derailleur of FIG. 2 when it is impacted.

10‧‧‧ Bicycle rear derailleur

50‧‧‧Chain guide member

51‧‧‧Sprocket

52‧‧‧Tension wheel

100‧‧‧Fixed member

200‧‧‧moving component

300‧‧‧Link assembly

310‧‧‧ First connecting rod

340‧‧‧Second Link

400‧‧‧Elastic reset

Claims (11)

A bicycle rear derailleur is suitable for being mounted on a frame and adjacent to a wheel and combined with a chain guide member. The bicycle rear derailleur includes: a fixed member for fixing to the frame; a movable member for Combined with the chain guide member; a link assembly including a first link and a second link, both ends of the first link are pivotally mounted on the fixed member and the movable member, the second Two ends of the connecting rod are respectively pivotally arranged on the fixed member and the movable member; an elastic reset member, one end of the elastic reset member is arranged on the movable member or the fixed member, and the other end of the elastic reset member is arranged on the first A connecting rod or the second connecting rod; and a driving assembly, comprising: a pushing member pivotally mounted on the movable member or the fixed member; a pushed member fixed on the movable member or the fixed member, and the The pushing member receives the elastic force of the elastic reset member and normally abuts the pushing member; and a power source is disposed on the first link or the second link, and the power source is used to drive the pushing member to rotate , So that the pushed member drives the movable member toward or away from the wheel. The bicycle rear derailleur as described in item 1 of the patent application scope, wherein the elastic return member is disposed at the pivotal connection between the first link and the fixed member, the pivotal connection between the first link and the movable member, the The pivotal connection between the second link and the fixed member or the pivotal connection between the second link and the movable member. The bicycle rear derailleur as described in item 2 of the patent scope, wherein the link assembly further includes a first pivot post, a second pivot post, a third pivot post, and a fourth pivot post, the The first link has a first pivotal portion and a second pivotal portion, the first pivotal portion is pivotally arranged on the fixing member through the first pivotal column, and the second pivotal portion passes through the second pivot The post is pivotally arranged on the movable member, the second link has a third pivotal portion and a fourth pivotal portion, the third pivotal portion is pivotally arranged on the fixed member through the third pivotal column, the The fourth pivotal part is pivotally arranged on the movable member through the fourth pivotal column, the elastic return member is a torsion spring, and the elastic return member includes a winding part, a first torsion arm part and a second torsion arm part , The first torsion arm portion and the second torsion arm portion are respectively connected to opposite sides of the winding portion, and the winding portion is sleeved on the first pivot post, the second pivot post, and the third One of the pivot post and the fourth pivot post, the first torsion arm portion is fixed to the first link or the second link, and the second torsion arm portion is fixed to the fixed member or the movable member . The bicycle rear derailleur as described in item 1 of the patent scope further includes a battery, the first connecting rod has a first accommodating space, and the battery is installed in the first accommodating space. The bicycle rear derailleur as described in item 4 of the patent application scope further includes a control main board, and the second link includes a first housing and a second housing, the first housing and the second housing are common Surrounding a second accommodating space, the control main board and the power source are disposed in the second accommodating space. The control main board is electrically connected to the power source for receiving a control signal to activate the power source. The rear derailleur of a bicycle as described in item 5 of the patent scope, wherein the control signal is a wireless signal. The bicycle rear derailleur as described in item 5 of the patent application scope, wherein the first housing is made of metal and the second housing is made of non-metal. The bicycle rear derailleur as described in item 7 of the patent application scope further includes a signal receiver, the signal receiver is disposed in the second accommodating space and is adjacent to the second housing, and the signal receiver is electrically Connect the control board. The bicycle rear derailleur as described in item 1 of the patent scope, wherein the second link is adjacent to the wheel as compared to the first link, and the power source is disposed on the second link. The bicycle rear derailleur as described in item 1 of the scope of patent application, wherein the pushing member is pivotally arranged on the movable member, and the pushed member is fixed to the movable member. The bicycle rear derailleur as described in item 1 of the patent scope, wherein the pushed member detachably abuts against the pushed member.

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