TWI518001B - Electric rear guide - Google Patents

Description

Electric rear chain guide

The present invention relates to a bicycle chain guide, and more particularly to a bicycle electric rear chain guide structure that prevents jamming or transmission failure.

According to the modern bicycle, most of them have a shifting function, which includes a rear chain guide mounted on the rear frame of the bicycle, and the rear chain guide adjusts the bicycle chain to a target chain plate of the rear chain plate. The shifting function, and due to advances in the bicycle industry, the rear chain guide has developed an electronic chain guide system driven by an electric motor. In operation, the electric motor is controlled by a shift controller mounted on the bicycle handle. When the electric motor receives the start signal, the gear set is driven to drive the chain guide to bring the bicycle chain to the preset target sprocket. In order to achieve the function of shifting.

However, since the bicycle is vibrated on various road surfaces, the components of the chain guide are also susceptible to vibration, resulting in misalignment or jamming between the gear sets, especially when the chain guide is impacted, the gear set is not only misaligned or stuck. The death causes the shifting process to be out of alignment, which makes it easier to damage the function of the electric motor and even cause the motor to be damaged and the motor needs to be replaced.

Accordingly, the main object of the present invention is to solve the problem that the conventional electric rear chain guide is subjected to impact, resulting in a shifting jam and a motor damage.

In order to achieve the above object, the present invention discloses an electric rear chain guide, a group The rear frame of the bicycle comprises a fixing portion, a driving component, a transmission unit, a linkage unit and a chain portion. The fixing portion has a first joint and a fixed end. The drive element drives a drive wheel rotation. The transmission unit has a transmission shaft and a transmission block. The transmission shaft is provided with a driven wheel and a threaded segment. The driven wheel is engaged with the driving wheel and is driven to rotate by the driving wheel. The transmission block has a screw hole and a screw hole. a transmission portion, the transmission block is screwed to the threaded portion by the screw hole and is movable back and forth with respect to the transmission shaft. The linkage unit includes a base, a rotating wheel and a gear set, the base has a first end and a second end, the first end is pivotally connected to the first joint and the first joint is The shaft rotates, the wheel is engaged with the transmission portion, the gear set is disposed on the base, the gear set is coupled to and driven by the wheel, and the chain portion has a second joint and is pivotally connected thereto. The second end rotates the dial portion relative to the base, and the gear set is coupled to the first joint and the second joint respectively, so that the first joint and the second joint rotate synchronously, and drives the machine The seat rotates, so that the chain part drives a bicycle chain to move and shifts.

Further, the base further includes a cover and a shaft seat, the axle seat is disposed between the base and the cover, and the cover, the axle seat and the base are connected by a connecting member, The housing has a receiving space, and the gear assembly is disposed in the receiving space, the gear set includes: a main transmission gear, a first gear and a second gear, wherein the main transmission gear is located at the first gear and the The second gears are respectively engaged with the first gear and the second gear, and the main transmission gear is driven to rotate by the transmission block.

Further, the first gear shaft is formed with a first shaft hole, the first shaft hole is pivoted for a first rotating shaft, and the second gear shaft is provided with a second shaft hole, and the second shaft hole is provided for The second shaft is pivoted.

Further, the first rotating shaft is disposed in a first bearing, the first bearing is disposed between the shaft seat and the first rotating shaft, and the first rotating shaft is matched with a first shaft hole of the first gear The second rotating shaft is pivotally disposed on a second bearing, the second bearing is disposed between the second rotating shaft and the shaft seat, and the second rotating shaft and the second gear are The two shaft holes cooperate, and the second gear drives the second shaft to rotate.

Further, the first joint is provided with a first recess communicating with the receiving space, the first gear is provided with a first flange and the first recess, and the second joint is provided with the first recess One second recess is spatially connected, and the second gear is provided with a second flange to be engaged with the second recess.

Further, a ring is protruded from one side of the rotating wheel, and a protruding key is formed on the outer circumference of the ring. The main driving gear is formed with a center hole. The central wall of the center hole is provided with a slot, and the protruding key is engaged with the slot.

Further, one side of the main transmission gear is provided with a main transmission gear flange, and the main transmission gear flange is disposed at a center of a main transmission bearing, and the main transmission gear is provided with a center hole, and the hole wall of the center hole A slot is provided, and a convex key on the outer side of the runner is fitted into the slot.

Further, the chain part is connected to a sprocket seat, the sprocket seat is provided with at least one sprocket for hanging the chain of the bicycle, and a space is formed between the frame and the sprocket for the bicycle The chain passes through.

Further, the driving component further includes an idler gear, the driving wheel fitting the idler gear, and the idler gear is engaged with the driven wheel.

Further, the driving element is an electric motor.

When the bicycle is driven to vibrate or impact on various road surfaces, the dialing When the chain portion is subjected to vibration or impact, the impact force path is sequentially the second gear, the main transmission gear, the rotating wheel, the transmission block, the transmission shaft, the driven wheel, the idler, the driving wheel, and finally Is the drive component. When the impact force is transmitted to the rotating wheel, the rotating force of the rotating wheel is transmitted to the transmission portion and causes the transmission block to generate a thrust parallel to the tangential direction of the engaging portion of the rotating portion and the transmission portion, but The transmission block is screwed on the transmission shaft, so the thrust is absorbed by the threaded portion of the transmission shaft and the screw hole of the transmission block so that the thrust does not continue to be transmitted to the driving element. Thereby, the situation that the driving member does not cause the gear to be stuck or malfunction under strong impact can be prevented, thereby solving the problem that the conventional electric rear chain guide is prone to jam and the transmission is not enough when it encounters a strong impact.

a‧‧‧Bicycle

A1‧‧‧ rear frame

A2‧‧‧ sprocket

A3‧‧‧ spacing

A4‧‧‧Chain

A5‧‧‧ sprocket

10‧‧‧Drive components

11‧‧‧Drive wheel

12‧‧‧ Idler

13‧‧‧passive wheel

14‧‧‧Drive shaft

141‧‧ Thread segment

15‧‧‧Transport block

151‧‧‧ screw holes

152‧‧‧Transmission Department

16‧‧‧Runner

161‧‧‧ collar

162‧‧‧ convex keys

20‧‧‧ machine base

201‧‧‧ first end

202‧‧‧ second end

203‧‧‧ Included space

204‧‧‧ first pit

205‧‧‧second pit

21‧‧‧ Fixed Department

211‧‧‧ first joint

212‧‧‧Fixed end

22‧‧‧Dial chain

221‧‧‧second joint

23‧‧‧ Gear Set

2321‧‧‧First shaft hole

2331‧‧‧Second shaft hole

231‧‧‧Main drive gear

232‧‧‧First gear

233‧‧‧second gear

234‧‧‧Main drive gear flange

235‧‧‧ center hole

236‧‧‧ slots

237‧‧‧First flange

238‧‧‧second flange

24‧‧‧ shaft seat

241‧‧‧Main drive bearing

242‧‧‧First bearing

243‧‧‧second bearing

25‧‧‧ Cover

251‧‧‧through holes

252‧‧‧Connecting components

26‧‧‧First shaft

27‧‧‧second shaft

28‧‧‧ mandrel

30‧‧‧Transmission unit

40‧‧‧ linkage unit

FIG. 1 is a schematic view of a bicycle rear frame according to an embodiment of the present invention.

2 is an enlarged view of a bicycle rear frame according to an embodiment of the present invention.

Figure 3 is an exploded perspective view of an embodiment of the present invention.

FIG. 4 is a partial combination diagram 1 of an embodiment of the present invention.

FIG. 5 is a partial combination diagram 2 of an embodiment of the present invention.

Figure 6 is a partial plan view of an embodiment of the present invention.

7A and 7B are motion diagrams of an embodiment of the present invention.

The detailed description of the present invention and the technical description of the present invention are further illustrated by the embodiments, but it should be understood that these embodiments are for illustrative purposes only and are not to be construed as limiting.

Please refer to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 and FIG. 5 . Referring first to FIG. 1 , FIG. 2 and FIG. 3 , FIG. 1 , FIG. 2 and FIG. 3 respectively illustrate a schematic diagram of a bicycle rear frame according to an embodiment of the present invention. The present invention discloses an electric rear chain guide which is assembled on a rear frame a1 of the bicycle a for driving a chain a4 of the bicycle a, and includes a fixing portion 21 and a driving component 10. A transmission unit 30, a linkage unit 40, and a chain portion 22.

The fixing portion 21 has a first joint 211 and a fixed end 212. The fixed end 212 is connected to the rear frame a1, and the first joint 211 is connected to the linking unit 40. The first joint 211 is connected with the linking unit 40. There is a first recess 204.

The drive member 10, which in this embodiment is an electric motor, drives a drive wheel 11 (a gear in this embodiment) to rotate.

The transmission unit 30 has a transmission shaft 14 and a transmission block 15. The transmission shaft 14 is provided with a driven wheel 13 (a gear in this embodiment) and a threaded section 141. The driving wheel 11 is fitted to an idler wheel 12 (this embodiment) In the example, a gear), the idler 12 is fitted to the driven wheel 13, whereby the driving wheel 11 can drive the driven wheel 13 to rotate. The transmission block 15 has a screw hole 151 and a transmission portion 152 having a plurality of fitting teeth. The block 15 is screwed to the threaded section 141 with its screw hole 151 and is movable back and forth with respect to the transmission shaft 14.

The interlocking unit 40 includes a base 20, a rotating wheel 16 and a gear set 23. The base 20 has a first end 201, a second end 202, a spindle 28, a receiving space 203 and a cover plate 25. The first end 201 is pivotally connected to the first joint 211 and is rotated by the first joint 211. The gear set 23 is disposed on the base 20. The rotating wheel 16 (in this embodiment, a gear) meshes with the transmission portion 152. The wheel 16 is connected to the mandrel 28, and a ring 161 is disposed on one side of the wheel 16, and a convex key 162 is disposed on the outer circumference of the collar 161. In this embodiment, the driving wheel 11, the idler 12 and the driven wheel 13 are peripherally The embossed cogs mesh.

The dial portion 22 has a second joint 221 and is pivotally connected to the second end 202 such that the dial portion 22 is rotated relative to the base 20 and the second joint 221 is coupled to the second end 202. There is a second pit 205. The chain part 12 is connected to a sprocket a2. As shown in FIG. 6, the sprocket a2 is provided with a chain a4 for the bicycle a. One less sprocket a5, the base 20 and the sprocket a2 form a spacing a3, and the spacing a3 provides the chain a4 to pass through.

Referring to FIG. 5, the gear set 23 is coupled to and driven by the rotating wheel 16, and the gear set 23 includes a main transmission gear 231, a first gear 232, and a second gear 233 installed in the receiving space 203. . The main transmission gear 231 is located between the first gear 232 and the second gear 233 and meshes with each other, whereby the main transmission gear 231 can simultaneously drive the first gear 232 and the second gear 233, and the main transmission gear 231 faces the cover plate 25 A main drive gear flange 234 is disposed on the side, the main drive gear flange 234 is disposed in the center of a main drive bearing 241, the main drive gear 231 is provided with a center hole 235, and the center hole 235 is provided with a slot 236 in the hole wall. The outer convex key 162 is fitted to the groove 236.

Referring to FIG. 3, the detailed configuration of the gear set 23 will now be described. The first gear 232 is formed with a non-circular first shaft hole 2321 for pivoting a first rotating shaft 26, and the first rotating shaft 26 has a One end of the same shape of the first shaft hole 2321 is non-rotatably fitted to the first shaft hole 2321, whereby the first gear 232 can drive the first rotating shaft 26 to rotate, and the shaft seat 24 and the first rotating shaft 26 A first bearing 242 is disposed to reduce the friction between the first rotating shaft 26 and the shaft seat 24. The second shaft 233 is also formed with a second shaft hole 2331 for pivoting a second rotating shaft 27, the first rotating shaft. 26 has one end of the same shape as the first shaft hole 2321 and is non-rotatably fitted to the first shaft hole 2321, the second rotating shaft 27 is pivotally disposed on a second bearing 243, and the second bearing 243 is disposed in the second Between the rotating shaft 27 and the shaft seat 24, the second rotating shaft 27 is disposed through the second gear 233, and the second gear 233 drives the second rotating shaft 27 to rotate.

The cover plate 25 is used to seal the transmission block 15 and is provided with a constant hole 251 for the drive shaft 14 to pass through. The cover plate 25 passes through the shaft base 24 and locks the cover plate 25 by a plurality of connecting elements 252 (bolts in this embodiment). The driving base 10 and the driving wheel 11 are mounted on the cover plate 25, and the driving wheel 11, the idler 12 and the driven wheel 13 are fixed to the base 20. It is exposed on the outside of the cover plate 25. Please refer to Figure 3, Figure 6 and Figure 7A together. 7B, after the driving component 10 is started, the driving wheel 11 is driven to rotate, the driving wheel 11 drives the driven wheel 13 to rotate by the idler 12, and the driven wheel 13 drives the transmission shaft 14 to rotate, and the threaded section 141 of the transmission shaft 14 and the transmission block 15 are driven. The screw hole 151 is screwed to displace the transmission block 15 along the transmission shaft 14, and is further engaged with the tooth portion of the wheel 16 by the transmission portion 152 of the transmission block 15 to drive the wheel 16 to rotate about the spindle 28 The runner 16 further drives the main transmission gear 231 to rotate, because the main transmission gear 231 meshes with the first gear 232 and the second gear 233, and the first flange 237 of the first gear 232 and the first recess of the base 20 The second flange 238 of the second gear 233 cooperates with the second recess 205, whereby the main transmission gear 231 can simultaneously drive the first gear 232 and the second gear 233 to the common drive base 20 to fix the portion 21 For the rotation of the shaft, the chain portion 22 is displaced by the sprocket a2, and the sprocket a5 mounted on the sprocket a2 is displaceable, and the chain a4 attached to the sprocket a5 and passing through the spacing a3 is movable. The chain a3 is hung on a target chain plate of the rear chain plate (not shown) of the bicycle a to achieve the purpose of shifting.

Since the bicycle is inevitably subjected to vibration or impact on various road surfaces, when the base 20 or the sprocket a2 is subjected to vibration or impact, the impact path of the impact force is sequentially the second gear 233, the main transmission gear 231, the runner 16, and the transmission. Block 15, drive shaft 14, driven wheel 13, idler 12, drive wheel 11, and finally drive element 10. When the impact force is transmitted to the runner 16, the force of rotation of the runner 16 is transmitted to the transmission portion 152 and causes the transmission block 15 to generate a thrust parallel to the tangential direction of the fitting portion of the runner 16 and the transmission portion 152, but The block 15 is screwed on the transmission shaft 14, so that the thrust is absorbed by the threaded section 141 of the transmission shaft 14 and the screw hole 151 of the transmission block 15 so that the thrust does not directly hit the teeth of the idler 12 and the driving wheel 11. And further solving the problem that the concave and convex cogs of the passive wheel 13 and the idler wheel 12 are jammed or offset or even impinge on the driving element 10 to cause damage to the driving element.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

a‧‧‧Bicycle

A1‧‧‧ rear frame

A2‧‧‧ sprocket

A3‧‧‧ spacing

A5‧‧‧ sprocket

10‧‧‧Drive components

11‧‧‧Drive wheel

20‧‧‧ machine base

21‧‧‧ Fixed Department

22‧‧‧Dial chain

Claims (10)

An electric rear chain guide assembled on a rear frame of a bicycle for driving a chain of a bicycle, comprising: a fixing portion having a first joint and a fixed end, the fixed end being connected with the rear frame a driving component that drives a driving wheel to rotate; a transmission unit having a transmission shaft and a transmission block, the transmission shaft is provided with a driven wheel and a threaded segment, and the driven wheel is fitted with the driving wheel and receives the driving wheel Driven and rotated, the transmission block has a screw hole and a transmission portion, the transmission block is screwed to the thread segment and can move forward and backward relative to the transmission shaft; a linkage unit includes a base and a rotation a wheel and a gear set, the base has a first end and a second end, the first end is pivotally connected to the first joint and rotates with the first joint as an axis, and the rotating wheel is engaged with the transmission portion The gear set is disposed on the base, the gear set is coupled to and driven by the rotating wheel, and a chain portion having a second joint and pivoted to the second end to cause the chain The part rotates relative to the base; wherein the gear set is respectively knotted To the first joint and the second joint so that the first joint and the second joint simultaneous rotation of the machine base to rotate and drive the driven portion of the derailleur moves the chain of the bicycle. The electric rear chain guide according to the first aspect of the invention, wherein the base further comprises a cover and a shaft seat, the axle seat is disposed between the base and the cover, and the cover, the cover The shaft base and the base are connected by a connecting member, the base has a receiving space, and the gear is assembled in the receiving space, the gear set comprises: a main transmission gear, a first gear and a second gear The main transmission gear is located between the first gear and the second gear and is respectively engaged with the first gear and the second gear, and the main transmission gear is driven to rotate by the transmission block. The electric rear chain guide according to claim 2, wherein the first gear is The first shaft hole is pivoted for a first shaft, and the second shaft is provided with a second shaft hole for pivoting a second shaft. The electric rear chain guide according to claim 3, wherein the first rotating shaft is disposed through a first bearing, the first bearing is disposed between the shaft seat and the first rotating shaft, and the first The rotating shaft cooperates with a first shaft hole of the first gear to rotate the first rotating shaft, the second rotating shaft is pivotally disposed on a second bearing, and the second bearing is disposed between the second rotating shaft and the shaft seat The second rotating shaft cooperates with a second shaft hole of the second gear, and the second gear drives the second rotating shaft to rotate. The electric rear chain guide according to claim 4, wherein the first joint is provided with a first recess communicating with the receiving space, the first gear is provided with a first flange and the first concave The second joint is provided with a second recess communicating with the receiving space, and the second gear is provided with a second flange and the second recess. The electric rear chain guide according to claim 2, wherein a ring is protruded from one side of the wheel, and a convex key is formed on an outer circumference of the ring, and the main transmission gear is provided with a center hole, and the center hole peripheral wall A slot is provided, and the protruding key is fitted into the slot. The electric rear chain guide according to claim 6, wherein one side of the main transmission gear is provided with a main transmission gear flange, and the main transmission gear flange is disposed at a center of a main transmission bearing. The electric rear chain guide according to claim 1, wherein the chain link portion is connected to a chain tooth holder, and the chain tooth holder is provided with at least one chain gear plate for hanging the chain of the bicycle. A spacing is formed with the chain holder for the chain of the bicycle to pass through. The electric rear chain guide according to claim 1, wherein the driving element further comprises an idler gear, the driving wheel fitting the idler gear, and the idler gear is fitted with the driven wheel. The electric rear chain guide according to claim 1, wherein the driving element is an electric motor.