CN111717327A - Protective structure of electric derailleur - Google Patents

Abstract

A protective structure of an electric derailleur comprises a driving part and a transmission part, wherein the driving part is connected to a frame and comprises a driving part and a driving shaft, and the driving part drives the driving shaft to rotate; the transmission part comprises a first transmission piece, a second transmission piece and an elastic piece, in a first state, the driving piece drives the driving shaft to rotate so as to drive the first transmission piece to rotate, and the first transmission piece drives the second transmission piece to rotate so as to drive the chain-pulling frame to move; under a second state, the second transmission piece is stressed to generate sliding friction with the first transmission piece, and the second transmission piece and the first transmission piece provide a buffer effect to prevent the transmission piece from being directly impacted and damaged.

Description

Protective structure of electric derailleur

technical field

The present invention relates to an electric derailleur; in particular, it refers to a protection structure for an electric derailleur.

Background technique

The chains of known bicycles usually use derailleurs to guide the chain to the chainrings, and bicycles are usually provided with a plurality of chainrings, each chainring has a different size and number of teeth, by moving the chain from the plurality of teeth. One of the discs is selectively moved to the other to change the speed of the bike, to the effect of changing gears.

Traditional bicycles use mechanical principles to move the chain. In recent years, the industry has gradually upgraded the derailleur to an electric derailleur, that is, the motor is used as the driving force and the gear set is used to transmit the power of the motor to an output shaft. Then, the rotation of the output shaft drives the derailleur frame to move, thereby changing the relative positions of the chain and the plurality of chainrings, so as to switch the chain to different chainrings to achieve the purpose of shifting gears.

Although the electric derailleur is ideal, when the electric derailleur is hit by an external force, the gears of the motor inside the electric derailleur may be worn or broken due to the violent movement of the derailleur frame, which will lead to damage to the motor. Or the electric derailleur shifts inaccurately and loses the shifting function.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a protection structure for an electric derailleur of a bicycle, when the electric derailleur is hit by an external force, it can absorb the external force, so as to protect the motor gears and other parts inside the electric derailleur from being damaged. Damage caused by direct impact.

In order to achieve the above purpose, the present invention provides a protective structure for an electric derailleur of a bicycle, comprising a driving part and a transmission part, the driving part is connected to a frame, and the driving part comprises a driving part and a driving part The drive part drives the drive shaft to rotate; the transmission part includes a first transmission part, a second transmission part and an elastic part, the first transmission part is arranged on the drive shaft and moves synchronously with the drive shaft ; A part of the second transmission part is connected to a derailleur frame, and the other part abuts against the first transmission part; the elastic part provides a push force to make the second transmission part abut against the first transmission part; in a first transmission part In a state, the drive member drives the drive shaft to rotate to drive the first transmission member to rotate, and the first transmission member drives the second transmission member to rotate to drive the derailleur frame to move; in a second state, The second transmission member is under force to generate sliding friction with the first transmission member.

The effect of the present invention is that in the first state, the first transmission member drives the second transmission member to rotate, and drives the derailleur frame to move to switch the chain to different chainrings, so as to achieve the effect of shifting. In the second state, when the second transmission member is collided by an external force, sliding friction will be generated between the second transmission member and the first transmission member to eliminate or slow down the force, so as to avoid the internal parts of the electric derailleur Damaged by direct impact.

Description of drawings

1 is a schematic diagram of a protective structure, a frame and a derailleur frame of an electric derailleur according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of the protective structure and the derailleur frame of the electric derailleur according to the above preferred embodiment.

FIG. 3 is a schematic diagram of the protection structure of the electric derailleur according to the above preferred embodiment.

FIG. 4 is a schematic diagram of the protection structure of the electric derailleur according to the above preferred embodiment.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4 .

FIG. 6 is a schematic diagram of the protection structure of the electric derailleur according to the above preferred embodiment.

FIG. 7 is a schematic diagram of some components of the protective structure of the electric derailleur according to the above preferred embodiment.

Detailed ways

In order to illustrate the present invention more clearly, a preferred embodiment is given and described in detail with the accompanying drawings as follows. Please refer to FIGS. 1 to 2 , which are schematic diagrams of the relationship among the electric derailleur, the frame and the derailleur frame according to a preferred embodiment of the present invention. One end of the electric derailleur 1 is connected to a frame 2 , and the frame 2 A plurality of chainrings 3 are arranged thereon, and the other end of the electric derailleur 1 is connected to a derailleur frame 5 through a linkage rod group 4 to adjust the position of the derailleur frame 5 relative to the chainring 3 .

Referring to FIGS. 3 to 5 , the electric derailleur 1 includes a gear box 10 and a protection structure 20 , the gear box 10 has a through hole, the protection structure 20 includes a driving part and a transmission part, the driving part The part includes a drive member and a drive shaft 201, the drive member is disposed in the gear box 10, the drive shaft 201 passes through the through hole of the gear box 10, in this embodiment, the drive member includes a gear set ( Not shown) and connected to a motor (not shown) for transmitting the power of the motor to the drive shaft 201 to drive the drive shaft 201 to rotate.

The transmission part includes a first transmission member 202, a second transmission member 203, and an elastic member 204. The first transmission member 202 is disposed on the drive shaft 201 and moves simultaneously with the drive shaft 201; the second transmission member A part of 203 is connected to a derailleur frame 5 , and the other part abuts against the first transmission member 202 ; the elastic member 204 provides a push force to make the second transmission member 203 abut against the first transmission member 202 . In this embodiment, the transmission part further includes a nut 205, the first transmission member 202 has a first shaft hole 202a, the hole wall of the first shaft hole 202a has a first plane 202b, and the drive shaft 201 has a A second plane 201b is matched with the first plane 202b, the first transmission member 202 is sleeved on the driving shaft 201 by the first shaft hole 202a, and rotates coaxially with the driving shaft 201; the second transmission The member 203 further includes a rocker arm 210 and a cam 211, the rocker arm 210 has a through hole 210a, the hole wall of the through hole 210a has a third plane 210b, the cam 211 has a fourth plane 211a and the third plane 210b Matching, the rocker arm 210 is sleeved on the cam 211 through the through hole 210a, and by the cooperation of the fourth plane 211a and the third plane 210b, the rocker arm 210 and the cam 211 move together, the rocker arm One end of 210 is connected to the derailleur frame 5, the cam 211 has a second shaft hole 211b, the cam 211 is sleeved on the drive shaft 201 by the second shaft hole 211b and abuts against the first transmission member 202, The cam 211 is rotatably disposed on the drive shaft 201 and does not move simultaneously with the drive shaft 201; the cam 211 also includes an accommodating groove 211c, the elastic member 204 has a third shaft hole 204a, the elastic The member 204 is sleeved on the drive shaft 201 by the third shaft hole 204a and is arranged in the accommodating groove 211c, wherein the drive shaft 201 has a thread matching the nut 205, and the nut 205 can move through the thread. Disposed on the drive shaft 201 , one end of the elastic member 204 abuts against the nut 205 , and the other end abuts against the cam 211 of the second transmission member 203 , the elastic member 204 provides a push force to make the second transmission member The cam 211 of 203 is in contact with the first transmission member 202. By moving the position of the nut 205 on the drive shaft 201, the magnitude of the thrust force exerted by the elastic member 204 on the second transmission member 203 can be adjusted. In an embodiment, the elastic member 204 is a plurality of disc springs stacked opposite to each other. In other embodiments, the elastic member 204 can also be a compression spring or other elastic members that can provide a pushing force.

One of the first transmission member 202 and the second transmission member 203 is provided with at least one convex rib, and the other is provided with at least one groove, and the at least one groove is in contact with the at least one convex rib, please refer to FIG. 6 and FIG. 7 , in this embodiment, the first transmission member 202 has the at least one rib 212 and the number of the at least one rib 212 is two, and the cam 211 of the second transmission member 203 has the At least one groove 213 and the number of the at least one groove 213 is two, the groove lengths of the two grooves 213 are not equal, and the lengths of the two protruding ribs 212 are respectively set corresponding to the groove lengths of the two grooves 213 , one of the grooves 213 and one of the ribs 212 is closer to the axis, the other of the grooves 213 and the other of the ribs 212 is farther from the axis, and the two grooves 213 and the two ribs 212 The contour of the rib is in the shape of a crescent moon. It is worth mentioning that first slopes 212a are formed on both sides of the plurality of protruding ribs 212, and corresponding second slopes 213a are formed on both sides of the groove walls of the plurality of grooves 213. , the second slope 213a is matched with the first slope 212a.

In a first state S1, the push force provided by the elastic member 204 causes the cam 211 of the second transmission member 203 to abut on the first transmission member 202 and pass through the two grooves 213 and the two The cooperation of the protruding ribs 212 increases the static friction force between the cam 211 of the second transmission member 203 and the first transmission member 202, whereby when the driving member drives the driving shaft 201 to rotate, the driving shaft 201 drives the The first transmission member 202 rotates, and the second transmission member 203 drives the derailleur frame 5 to move with the rotation of the first transmission member 202 because the second transmission member 203 does not overcome the static friction force with the first transmission member 202 . The effect of shifting is achieved; in a second state S2, the second transmission member 203 is subjected to an external force, which produces sliding friction with the first transmission member 202. For example, when the bicycle is tipped over, the second transmission member 203 is subjected to an impact. , the second transmission member 203 overcomes the static friction force with the first transmission member 202 due to external force, and slides relative to the first transmission member 202. At this time, the first transmission member disposed on the drive shaft 201 The transmission member 202 does not move with the second transmission member 203, so that even if the second transmission member 203 is pivoted by an external force, the first transmission member 202 will not be driven to rotate, and the first transmission member 202 can be protected. The interlocking drive shaft 201 and the transmission parts connected with the drive shaft 201, such as gears, are prevented from being worn or broken, thereby preventing damage to the motor or inaccurate displacement and loss of the electric derailleur 1. Displacement function, etc.

The above are only preferred and feasible embodiments of the present invention, and all equivalent changes made by applying the description of the present invention and the scope of the patent application should be included in the scope of the patent of the present invention.

Description of reference numerals

[this invention]

1 Electric derailleur

10 Gearbox

20 Protective Structure

201 drive shaft 201b second plane

202 The first transmission member 202a The first shaft hole 202b The first plane

203 The second transmission part 204 The elastic part 204a The third shaft hole

205 Nut

210 rocker arm 210a perforated

210b Third plane 211 Cam 211a Fourth plane

211b The second shaft hole 211c Receiving groove 212 Rib

212a first slope 213 groove 213a second slope

2 frame

3 chainrings

4 linkage rod set

5 derailleur bracket

S1 first state

S2 second state

Claims (11)

1. A protective structure for an electric derailleur of a bicycle, comprising:

the driving part is connected to a frame and comprises a driving part and a driving shaft, and the driving part drives the driving shaft to rotate;

the transmission part comprises a first transmission piece, a second transmission piece and an elastic piece, wherein the first transmission piece is arranged on the driving shaft and moves with the driving shaft; one part of the second transmission piece is connected to a chain pulling frame, and the other part of the second transmission piece abuts against the first transmission piece; the elastic piece provides a pushing force to enable the second transmission piece to abut against the first transmission piece;

in a first state, the driving part drives the driving shaft to rotate so as to drive the first driving part to rotate, and the first driving part drives the second driving part to rotate so as to drive the derailleur to move;

in a second state, the second transmission piece is stressed to generate sliding friction with the first transmission piece.

2. The protective structure of an electric derailleur according to claim 1, wherein at least one of said first transmission member and said second transmission member is provided with at least one rib and the other is provided with at least one groove, said at least one groove abutting said at least one rib.

3. The protective structure of an electric derailleur according to claim 2, wherein a side of said at least one rib is formed with a first ramp and a wall of said at least one recess is formed with a second ramp, said second ramp cooperating with said first ramp.

4. The protective structure of an electric derailleur according to claim 2, wherein said at least one recess and said at least one rib are two in number, and wherein the lengths of said two recesses are not equal, and the lengths of said two ribs are respectively arranged to correspond to the lengths of said two recesses.

5. The protective structure of an electric derailleur according to claim 4, wherein said first transmission member has a first axle hole that is received in said drive axle and rotates along an axis of said drive axle; one of the grooves and one of the ribs are closer to the axis, and the other of the grooves and the other of the ribs are farther from the axis.

6. The protective structure of an electric derailleur according to claim 5, wherein said first axial bore wall has a first flat surface and said drive shaft has a second flat surface that mates with said first flat surface.

7. The protective structure of an electric derailleur according to claim 5, wherein said two recesses and said two ribs are crescent shaped in profile.

8. The protective structure of an electric derailleur according to claim 1, wherein said resilient member is a plurality of disc springs.

9. The protective structure of an electric derailleur according to claim 1, wherein said resilient member is a compression spring.

10. The protective structure for an electric derailleur according to claim 1, wherein said second transmission member includes a rocker arm and a cam, said rocker arm being coupled to said derailleur frame, said cam abutting said first transmission member, said rocker arm having a through hole for said cam to pass through, said rocker arm being co-operable with said cam.

11. The protective structure of an electric derailleur according to claim 10, wherein said perforated wall has a third flat surface and said cam has a fourth flat surface that mates with said third flat surface.

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