TWI679150B - Bicycle rear derailleur - Google Patents

Abstract

A bicycle rear derailleur is suitable for being mounted on a frame and adjacent to a wheel, and includes a fixed member, a movable member, a connecting rod assembly, an elastic reset member, and a driving assembly. The fixed member and the movable member are respectively used for fixing to the frame and the combined chain guide member. The link assembly includes a first link and a second link. Both ends of the first link and the second link are pivoted to a fixed member and a movable member, respectively. Two ends of the elastic resetting member are respectively arranged on the movable member or the fixed member and the connecting rod assembly. The driving assembly includes a pushing member, a pushed member and a power source. Both the pushing member and the pushed member are disposed on the movable member or the fixed member, and the pushed member normally abuts against the pushing member. The power source is arranged on the connecting rod assembly. The power source is used to drive the pushing member to rotate, and the movable member is driven toward or away from the wheel by the pushed member.

Description

Bicycle rear derailleur

The invention relates to a bicycle rear derailleur, in particular to a bicycle rear derailleur with a buffer mechanism to avoid damage to the driving motor due to external force impact.

In recent years, the bicycle market has been booming. Whether it is racing high-end bicycles, or popular bicycles as a means of travel and leisure and entertainment, consumers have loved them, prompting manufacturers to pay more attention to the user's demand for bicycle functions. Car body materials and equipment continue to improve and improve. Generally, a bicycle system is provided with a front chainring and a rear flywheel, and a chain is connected to connect the two. The user depresses the pedal to rotate the front chainring, and drives the rear flywheel to rotate through the chain, and simultaneously drives the rear wheel to advance the bicycle. In addition, bicycles are often equipped with a transmission for users to adjust the effort saving of pedaling. Specifically, the bicycle transmission includes a front transmission and a rear transmission, which are respectively used to control the position of the chain on the front chainring and the rear flywheel. The gear ratio of the front gearwheel and the rear flywheel is adjusted by switching gears, so as to achieve the goal of adjusting the effort-saving degree of pedaling.

Later transmissions are taken as an example. In addition to the conventional mechanical rear transmission, many bicycles are gradually adopting electronic rear transmissions. The electronic rear transmission uses a motor as a power source to control the relative pivoting of the four links of the rear transmission, and then drives the rear transmission to shift gears. However, since the rear transmission of the bicycle is exposed outside the vehicle, once the rear transmission is hit, the impact force is 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 transmission is impacted is really one of the problems that researchers in this field need to solve.

The present invention is to provide a bicycle rear transmission, so as to solve the problem that the motor described in the prior art is easily damaged after the rear transmission 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 is combined with a chain guide member. The bicycle rear derailleur includes a fixed member, a movable member, a connecting rod assembly, an elastic reset member, and a driving assembly. The fixing member is used for fixing to the frame, and the movable member is used for combining with the chain guide member. The link assembly includes a first link and a second link. Both ends of the first link are pivoted to the fixed member and the movable member, respectively, and both ends of the second link are pivoted to the fixed member and the movable member, respectively. One end of the elastic reset 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 member is pivoted 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 is normally abutted against the pushing member by the elastic force of the elastic reset 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 by 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 pushed member from the pushed member, so the impact force will not be transmitted through the pushed member and the pushing member. To the power source. Therefore, the probability that the power source is damaged when the bicycle rear transmission is impacted by an external force can be reduced.

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

The bicycle rear derailleur 10 of this embodiment is adapted to be 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 set 40 has a plurality of roulettes of different sizes, and the roulettes are sequentially arranged according to the sizes. Among them, the smallest-sized roulette is closest to the frame 20, and the largest-sized roulette is closest to the wheel 30.

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 view of FIG. 2.

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

The fixing member 100 is used for fixing to the frame 20, and the movable member 200 is used for being combined with a chain guide member 50. The chain guide member 50 has a guide sprocket 51 and a force wheel 52. The guide 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 connection portion 311 and a second pivotal connection portion 312. The first pivotal connection portion 311 is pivoted to the fixing member 100 through the first pivotal post 320, and the second pivotal connection portion 312 passes through the first The two pivot posts 330 are pivotally disposed on the movable member 200. The second link 340 has a third pivoting portion 341 and a fourth pivoting portion 342. The third pivoting portion 341 is pivotally mounted on the fixing member 100 through the third pivoting post 350, and the fourth pivoting portion 342 passes through the first The four pivot joint 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 fixed member 100 is installed 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 closer to or away from the fixed member 100 through the link assembly 300. Wheel 30.

The elastic resetting member 400 is, for example, a torsion spring. The elastic resetting member 400 includes a winding 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 coiled portion 410. The coiled portion 410 is sleeved on the first pivot post 320, 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 assembling portion 511 and a pushing portion 512 connected to each other. The assembling portion 511 is pivoted on the movable member 200 and is located between the movable member 200 and the fourth pivoting 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 pivoted to the movable member 200 through the fourth pivot post 360.

The pushed member 520 is, for example, a positioning pin. The pushed member 520 is inserted through 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 installed on the frame 20, the elastic restoring member 400 applies the force of the movable member 200 to swing 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 against the pushing portion 512 of the pushing member 510.

In this embodiment, the first link 310 also has a first receiving space 313, and the battery 600 is disposed in the first receiving space 313. The second connecting rod 340 includes a first casing 343 and a second casing 344, and the first casing 343 and the second casing 344 collectively surround a second accommodation space 345. The third pivoting portion 341 and the fourth pivoting portion 342 of the second link 340 are both located in the first casing 343.

The first housing 343 of the second link 340 is, for example, a metal material, and the second housing 344 is, for example, a non-metal material. The control motherboard 700 and the signal receiver 800 are disposed in the second accommodation 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 casing 343 and is used to receive a wireless control signal, such as a shift signal. Since the second casing 344 made of non-metal has a signal-passing property, the signal receiver 800 can ensure good signal receiving quality under the setting of the signal receiver 800 adjacent to the second casing 344.

The power source 530 is disposed in the second accommodation space 345. The power source 530 includes a motor 531 and a transmission component 532. The control motherboard 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, which are engaged with each other. In this embodiment, the fourth pivot post 360 is a first housing 343 passing through the second link 340, and a portion of the fourth pivot post 360 is located in the second accommodation space 345. The worm gear 5321 is coaxially fixed to the fourth pivot post 360, the worm 5322 is coaxially fixed to the output shaft 5311 of the motor 531, and a plurality of engaging gears 5323 connect the worm 5322 and the worm wheel 5321. When the control board 700 receives the wireless control signal through the signal receiver 800, the control 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 gears.

For details, please refer to FIG. 1, FIG. 3 and FIG. 4 together. FIG. 4 is an operation schematic diagram of the bicycle rear derailleur of FIG. 2.

When the output shaft 5311 of the motor 531 rotates forward, the motor 531 will drive the fourth pivot post 360 through the worm 5322, the engaging gears 5323 and the worm gear 5321, so that the pushing member 510 rotates in the direction D1 in FIG. 4 to drive The pushed member 520 moves together. At this time, the pushed member 520 not only drives the movable member 200 to rotate in the direction D2 with the axis of the fourth pivot post 360 as the center, but also causes the movable member 200 to 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 group 40 to the small plate 41 of the flywheel group 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 allow space for the push member 520 to pivot in the opposite direction of the direction D2. In this way, the elastic force of the elastic reset member 400 will cause the movable member 200 to swing relative to the fixed member 100 to move the movable member 200 in a direction 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 bicycle rear transmission of FIG. 2 when being impacted.

In this embodiment, when the bicycle is toppled or 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 will swing toward the wheel 30 so that The pushed member 520 is separated from the pushing member 510, so the avoidable surface impact force is transmitted to the transmission assembly 532 and the motor 531 through the pushed member 520 and the pushing member 510 to ensure that the worm gear 5321, the worm 5322, the gear 5323, and the motor 531 It will not be forced to rotate by impact force. Therefore, the probability that the transmission assembly 532 and the motor 531 are damaged when the bicycle rear transmission 10 is impacted by an external force can be reduced.

In the above-mentioned embodiment, the elastic restoring member 400 is disposed at a position where the first link 310 and the fixing member 100 pivot, so that the elastic restoring member 400 is shielded by the first link 310 and the fixing member 100, so that the bicycle The aesthetics of the transmission 10 is improved.

However, the installation position of the elastic reset member 400 is not intended to limit the present invention. In other embodiments, the elastic restoring member may be provided 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 resetting member is disposed at the pivotal connection between the first link and the movable member, the coiled portion of the elastic resetting member is sleeved on the second pivoting post, and the first torsion arm portion and the second The torsion arm portion is still fixed to the first link and the movable member, respectively. However, when the elastic resetting member is disposed at the pivotal connection of the second link and the fixing member, except that the coiled portion of the elastic resetting member is sleeved on the third pivoting post, the first torsion arm portion and the second The torsion arm portion is also fixed to the second link and the fixing member, respectively. Similarly, when the elastic restoring member is disposed at the pivotal connection of the second link and the movable member, the coiled portion of the elastic restoring member is sleeved on the fourth pivoting post, and the first torsion arm portion and the second torsion arm The parts are respectively fixed to the second link and the movable member.

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

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 are not limited thereto. In other embodiments, the positions of the battery and the power source transmission assembly 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 and separates the pushed member from the pushed member, so the surface impact force can be transmitted through the pushed member and the pushing member To the transmission assembly and the motor to ensure that the worm gear, worm, engaging gear and motor will not be forced to rotate by the impact force. Therefore, the probability that the transmission assembly and the motor are damaged when the rear transmission of the bicycle is impacted by an external force can be reduced.

In addition, since the second case made of a non-metal material has a characteristic that a signal can pass through, the signal receiving quality of the signal receiver can be ensured under the setting of the signal receiver adjacent to the second case.

In addition, the elastic restoring member is disposed at the pivotal connection of the first link and the fixing member, so that the elastic restoring member can be hidden, which greatly improves the aesthetics of the rear transmission of the bicycle.

Although the present invention is disclosed as above with the foregoing embodiments, it is not intended to limit the present invention. Any person skilled in similar arts can make some changes and retouch without departing from the spirit and scope of the present invention. The scope of patent protection of an invention shall be determined by the scope of patent application attached to this specification.

10‧‧‧ Bicycle rear derailleur

20‧‧‧frame

30‧‧‧ Wheel

40‧‧‧Flywheel Set

41‧‧‧small cap

42‧‧‧big market

50‧‧‧Chain guide member

51‧‧‧Guide Sprocket

52‧‧‧tension wheel

100‧‧‧Fixed components

200‧‧‧Activity component

300‧‧‧ connecting rod assembly

310‧‧‧First Link

311‧‧‧first pivot joint

312‧‧‧Second pivot joint

313‧‧‧First accommodation space

320‧‧‧ first pivot post

330‧‧‧Second pivot post

340‧‧‧Second link

341‧‧‧Third pivot

342‧‧‧Fourth pivot

343‧‧‧First case

344‧‧‧Second Shell

350‧‧‧ third pivot post

360‧‧‧Fourth pivot post

400‧‧‧ Elastic reset

410‧‧‧Circle

420‧‧‧First twist arm

430‧‧‧Second twist arm

500‧‧‧Driver

510‧‧‧Pushing

511‧‧‧Assembly Department

512‧‧‧Pushing Department

520‧‧‧ Pushed

530‧‧‧Power source

531‧‧‧ Motor

5311‧‧‧Output shaft

532‧‧‧drive assembly

5321‧‧‧worm gear

5322‧‧‧worm

5323‧‧‧Joint gear

600‧‧‧ battery

700‧‧‧control motherboard

800‧‧‧ Signal Receiver

D1, D2, D3 ‧‧‧ direction

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

Claims (13)

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 comprises: a fixing member for fixing to the frame; a movable member for To be combined with the chain guide member; a link assembly including a first link and a second link, and two ends of the first link are respectively pivoted to the fixed member and the movable member, and the second Two ends of the connecting rod are respectively pivoted to the fixed member and the movable member; an elastic reset member, one end of the elastic reset 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 member. A link or the second link; and a drive assembly including: a pushing member pivotally disposed on the movable member or the fixed member; a pushed member fixed on the movable member or the fixed member, and the The pushed member is normally abutted against the pushing member by the elastic force of the elastic reset member; and a power source is provided on the first link or the second link, and the power source is used to drive the pushing member to rotate To make the pushed member take The movable member approaches or moves away from the wheel; when an external force acts on the bicycle rear derailleur from the side of the bicycle rear derailleur away from the wheel, the mobile member swings toward the wheel, causing the pushed member to separate from The push pieces. The bicycle rear derailleur according to item 1 of the scope of patent application, wherein the elastic reset member is provided at a pivot joint of the first link and the fixed member, a pivot joint of the first link and the movable member, A pivot joint between the second link and the fixed member or a pivot joint between the second link and the movable member. According to the bicycle rear derailleur described in item 2 of the patent application 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 pivot joint portion and a second pivot joint portion, the first pivot joint portion is pivotally attached to the fixing member through the first pivot joint post, and the second pivot joint portion passes through the second pivot The post is pivoted on the movable member, the second link has a third pivot joint and a fourth pivot joint, and the third pivot joint is pivoted on the fixed member through the third pivot joint. A fourth pivoting portion is pivoted to the movable member through the fourth pivoting post. The elastic restoring member is a torsion spring. The elastic restoring member includes a winding portion, a first torsion arm portion and a second torsion arm portion The first torsion arm portion and the second torsion arm portion are respectively connected to opposite sides of the loop portion, and the loop 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 fixing member Or the active component. The bicycle rear derailleur described in item 1 of the patent application scope further includes a battery, the first link has a first accommodation space, and the battery is installed in the first accommodation space. The bicycle rear derailleur described in item 4 of the patent application scope further includes a control main board, the second link includes a first housing and a second housing, and the first housing and the second housing are common Around the 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 cause the power source to operate. The bicycle rear derailleur according to item 5 of the patent application scope, wherein the control signal is a wireless signal. According to the bicycle rear derailleur described in item 5 of the scope of patent application, the first case is made of metal and the second case is made of non-metal. The bicycle rear derailleur 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. According to the bicycle rear derailleur according to item 1 of the patent application scope, wherein the second link is adjacent to the wheel compared to the first link, and the power source is disposed on the second link. The bicycle rear derailleur according to item 1 of the scope of patent application, wherein the pushing member is pivotally disposed on the movable member, and the pushed member is fixed on the movable member. The bicycle rear derailleur according to item 1 of the patent application scope, wherein the pushed member detachably abuts against the pushed member. 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 comprises: a fixing member for fixing to the frame; a movable member for To be combined with the chain guide member; a link assembly including a first link and a second link, and two ends of the first link are respectively pivoted to the fixed member and the movable member, and the second Two ends of the connecting rod are respectively pivoted to the fixed member and the movable member; an elastic reset member, one end of the elastic reset 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 member. A link or the second link; and a drive assembly including: a pushing member pivotally disposed on the movable member or the fixed member; a pushed member fixed on the movable member or the fixed member, and the The pushed member is normally abutted against the pushing member by the elastic force of the elastic reset member; and a power source is provided on the first link or the second link, and the power source is used to drive the pushing member to rotate To make the pushed member take The movable member close to or away from the wheel toward the wheel; wherein, as compared to the second link of the first link adjacent to the wheel, the power source is disposed on the second link. 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 comprises: a fixing member for fixing to the frame; a movable member for To be combined with the chain guide member; a link assembly including a first link and a second link, and two ends of the first link are respectively pivoted to the fixed member and the movable member, and the second Two ends of the connecting rod are respectively pivoted to the fixed member and the movable member; an elastic reset member, one end of the elastic reset 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 member. A link or the second link; and a drive assembly including: a pushing member pivotally disposed on the movable member or the fixed member; a pushed member fixed on the movable member or the fixed member, and the The pushed member is normally abutted against the pushing member by the elastic force of the elastic reset member; and a power source is provided on the first link or the second link, and the power source is used to drive the pushing member to rotate To make the pushed member take The movable member close to or away from the wheel toward the wheel; wherein the pushing member pivotally connected to the movable member, the receiving member fixed to the movable pushing member.