CN218506062U - Bicycle speed variator - Google Patents

Abstract

The application provides a bicycle derailleur, including fixed part, chain guide portion, connecting rod portion, movable part and pivot. The fixing part is suitable for being fixed on a bicycle frame. The chain guide part is suitable for being combined with a bicycle chain. The connecting rod part is connected between the fixing part and the chain guide part. The movable part is pivoted between the connecting rod part and the chain guide part and comprises a packing piece, a base and a wedge clutch. The urging piece is arranged on one side of the movable part far away from the zipper part. The base is connected with the chain guide part. The wedge clutch is disposed between the packing and the base. The pivot shaft is connected to the movable part and the chain guide part and rotatably penetrates through the packing piece, the wedge clutch and the base. The pivot is suitable for driving the guide chain part to rotate relative to the movable part along the first direction or the second direction. The wedge clutch is suitable for stopping the pivot shaft from rotating along the second direction, so that the pivot shaft drives the wedge clutch to rotate when rotating along the second direction. The urging member is adapted to press the wedge clutch toward the base to inhibit the pivot from rotating the chain guide portion in the second direction.

Description

Bicycle speed variator

Technical Field

The present application relates to a derailleur, and more particularly to a bicycle derailleur.

Background

The bicycle sports has the functions of sightseeing, touring and body building, and the exercise intensity can be adjusted along with route selection or the type of the bicycle, so that more and more people are engaged in the bicycle sports in recent years. Most bicycles are equipped with a transmission so that the user can select a proper gear according to different road conditions. Generally, a transmission is provided with a plurality of adjacent pinions, and a chain connecting rear wheels (or front wheels) bypasses one of the pinions. When the user operates the gear shifting, the speed changer can drive the bicycle chain to move, so that the bicycle chain bypasses the other pinion, and simultaneously, the tension of the bicycle chain is maintained.

However, in the process of riding the bicycle, poor road conditions are inevitably encountered, and particularly, when the bicycle is used on off-road roads, the bicycle is often ridden over a plurality of obstacles with large height and fall. In this situation, the bicycle will hit the ground with a large force, causing the derailleur to vibrate violently, thus causing the chain to slacken instantaneously. Thus, unexpected gear shifting or even the bicycle chain falling off is easy to happen, and even riding accidents are caused seriously.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will be solved provides a bicycle derailleur to prevent that the bicycle chain from relaxing in the twinkling of an eye because of external force.

The bicycle derailleur provided by the present application includes a fixed portion, a chain guide portion, a link portion, a movable portion, and a pivot shaft. The fixing part is suitable for being fixed on a bicycle frame. The chain guide part is suitable for being combined with the bicycle chain and guiding the transmission direction of the bicycle chain. The connecting rod part is connected between the fixing part and the chain guide part. The movable part is pivoted between the connecting rod part and the chain guide part and comprises a packing piece, a base and a wedge clutch. The urging piece is arranged on one side of the movable part far away from the zipper part. The base is connected with the chain guide part. The wedge clutch is disposed between the packing and the base. The pivot is connected to the movable part and the chain guide part and rotatably penetrates through the packing piece, the wedge clutch and the base. The pivot is suitable for driving the guide chain part to rotate relative to the movable part along the first direction or the second direction. The wedge clutch is suitable for stopping the pivot shaft from rotating along the second direction, so that the pivot shaft drives the wedge clutch to rotate when rotating along the second direction. The urging member is adapted to press against the wedge clutch toward the base to inhibit the pivot from rotating the chain guide portion in the second direction.

In an embodiment of the application, the movable portion further includes a friction member, for example, and the friction member is abutted between the wedge clutch and the base.

In an embodiment of the present application, the material of the friction member includes, for example, a non-metallic material or a composite material.

In an embodiment of the present application, the wedge clutch may include a clutch body and a clutch housing. The clutch body is arranged in the clutch shell, and the clutch shell is suitable for abutting against the pressing piece and the base. The friction piece is abutted between the clutch shell and the base. The clutch shell is made of stainless steel, carbon fiber or plastic steel, and the base is made of aluminum alloy, carbon fiber or plastic steel.

In an embodiment of the present application, the urging member includes a disc spring, for example. The movable part may further include a housing connected to a side of the base adjacent to the link part. The urging member and the wedge clutch are disposed in an inner space formed by the base and the housing. The belleville spring is adapted to bear between the housing and the sprag clutch.

In an embodiment of the application, the movable portion may further include a pressure adjusting member. The housing has opposing top and bottom portions. The bottom is connected with the base, and the disc spring is close to the top. The pressure adjusting piece is arranged on the top in a penetrating mode and is suitable for being pressed against the disc spring through the top. The pressure adjusting member is adapted to move relative to the top portion to vary the pressure with which the top portion is pressed against the belleville spring.

In an embodiment of the present application, the movable portion may further include at least one pad. The pivot shaft is also disposed through the top of the housing and has a distal end extending from the top. The gasket is arranged at the tail end. The pressure adjusting piece is provided with a pressing part and a connecting part which are connected. The connecting part is arranged on the gasket and the tail end in a penetrating mode, and the pressing part is suitable for pressing the top part through the gasket.

In an embodiment of the present application, the pressure adjusting element includes a screw, and the end of the pivot has a screw hole corresponding to the screw.

In an embodiment of the present application, the movable portion may further include a first sealing member and a housing. The housing is disposed on a side of the base adjacent to the link portion, and the packing member and the wedge clutch are disposed in an inner space formed by the base and the housing. The first seal seals between the base and the housing.

In an embodiment of the application, the movable portion may further include a second sealing member and a housing. The shell is arranged outside the shell, and the second sealing piece is sealed between the shell and the shell.

In an embodiment of the present application, the movable portion further includes a shaft seal, for example, and the shaft seal is sealed between the pivot and the base.

In the bicycle transmission of the present application, the movable portion limits the rotational direction of the pivot shaft using the wedge clutch and additionally presses the wedge clutch with the urging member. In particular, the wedge clutch is capable of blocking rotation of the pivot shaft in a second direction, such as a chain slack direction. Therefore, when the pivot rotates along the second direction, the pivot drives the wedge clutch to rotate together, and the wedge clutch is pressed by the pressing piece and cannot rotate along the second direction instantly and rapidly. Based on the aforesaid, the bicycle derailleur of this application can avoid the pivot to drive chain guide portion along the second direction and rotate fast in the twinkling of an eye, and then can prevent that the bicycle chain from relaxing in the twinkling of an eye because of external force.

Other features and embodiments of the present application will be described in detail below with reference to the drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a bicycle shifter in accordance with an embodiment of the present application;

FIG. 2 is a schematic view of another perspective of the bicycle shifter of FIG. 1;

FIG. 3 isbase:Sub>A schematic cross-sectional view taken along section line A-A of FIG. 2;

FIG. 4 is an enlarged schematic view of the movable portion of FIG. 3;

fig. 5 is a schematic sectional view taken along the line B-B of fig. 2.

Description of the symbols

100: the bicycle transmission 110: fixing portion 120: chain guide part

130: link portion 140: the movable portion 141: packing piece

142: base 143: wedge clutch 144: friction element

145: pressure adjusting member 146: spacer 147: first seal member

148: second seal 149: shaft seal 150: pivot shaft

1430: the clutch body 1431: clutch housing 1450: pressing part

1451: a connecting part A: axial direction B: bottom part

C: bicycle chain D1: first direction D2: second direction

And (2) DS: disc spring E: terminals G1, G2: gasket

H: screw IS: inner space S1: shell body

S2: a shell SC: a screw T: top part

TS: a torsion spring W: wedge X, Y, Z: direction of rotation

Detailed Description

The positional relationship described in the following embodiments includes: the top, bottom, left and right, unless otherwise indicated, are based on the orientation of the elements in the drawings.

Referring initially to FIG. 1, a bicycle shifter is illustrated in accordance with one embodiment of the present application. FIG. 2 is a schematic view of another perspective of the bicycle shifter of FIG. 1. Fig. 3 isbase:Sub>A schematic sectional view taken along the linebase:Sub>A-base:Sub>A of fig. 2. Fig. 4 is an enlarged schematic view of the movable portion of fig. 3. Fig. 5 is a schematic sectional view taken along the line B-B of fig. 2. It should be noted that fig. 1, 2, 3 and 5 show the viewing angle relationship in directions X, Y and Z.

Referring to fig. 1 and 2, the bicycle derailleur 100 includes a fixed portion 110 (shown in fig. 1), a chain guide portion 120, a link portion 130, a movable portion 140 and a pivot 150 (shown in fig. 3). The fixing portion 110 is adapted to be fixed to a bicycle frame (not shown). The chain guide part 120 is adapted to be coupled with a bicycle chain C (shown in fig. 5) and guide a driving direction of the bicycle chain C. The link 130 is connected between the fixing part 110 and the chain guide 120. Referring to fig. 3 and 4, the movable portion 140 is pivotally connected between the link portion 130 and the chain guide portion 120, and includes a clamping member 141, a base 142, and a wedge clutch 143. The urging member 141 is provided on a side of the movable portion 140 away from the link portion 120. The base 142 is connected to the tether portion 120. The wedge clutch 143 is disposed between the packing 141 and the base 142. The pivot 150 is connected to the movable portion 140 and the chain guide portion 120, and rotatably passes through the urging member 141, the wedge clutch 143, and the base 142. Referring to fig. 4 and fig. 5, the pivot 150 is adapted to drive the chain guide portion 120 to rotate along a first direction D1 or a second direction D2 (both shown in fig. 5) relative to the movable portion 140. The wedge clutch 143 is adapted to stop the pivot shaft 150 from rotating in the second direction D2, such that the pivot shaft 150 rotates in the second direction D2 to drive the wedge clutch 143 to rotate. The urging member 141 is adapted to press against the wedge clutch 143 toward the base 142 to inhibit the pivot shaft 150 from rotating the zipper part 120 in the second direction D2.

Referring to fig. 1 again, the fixing portion 110 can be fixed to the bicycle frame by screws (not shown). In the present embodiment, the fixing portion 110 is locked to a lug (deralleur hanger) of the bicycle frame rear fork (chain stay), but other embodiments are not limited thereto.

Referring to fig. 1 and 5, the chain guide 120 of the present embodiment is used for a bicycle chain C to pass through, so as to guide the bicycle chain C to drive a flywheel (not shown) and a large plate (not shown) to rotate.

As shown in fig. 2, opposite ends of the link portion 130 may be pivotally connected to the movable portion 140 and the fixed portion 110. In detail, the link portion 130 drives the chain guide portion 120 to move along the direction Z or a direction opposite to the direction Z relative to the fixing portion 110 after being actuated by the shift operation. Thus, referring to fig. 2 and 5 together, the chain guide 120 can guide the bicycle chain C around different pinions (not shown) to complete the gear shifting. In addition, during the shifting process, the chain guide 120 rotates in the first direction D1 or the second direction D2 to maintain the bicycle chain C in tension. It should be noted that, in the case that the link portion 130 is not actuated by the shifting operation, if the chain guide portion 120 is rotated in the second direction D2 by other external forces, the bicycle chain C may be loosened momentarily, which may cause unexpected shifting or even the bicycle chain C may fall off. Therefore, the movable portion 140 of the present embodiment can prevent the chain guide portion 120 from being instantaneously and rapidly rotated in the second direction D2 by other external forces when the gear is not shifted, as will be described in detail below.

As shown in fig. 3 and 4, the base 142 of the movable portion 140 can be penetrated by the pivot 150, such that the pivot 150 is pivotally connected to the chain guide portion 120. In detail, with continued reference to fig. 4 and with reference to fig. 5, the base 142 includes, for example, a torsion spring TS (labeled in fig. 4) that provides a pre-tensioning force for the pivot shaft 150 to prevent the chain guide 120 from undesirably rotating in the second direction D2 during the shifting process, thereby maintaining the tension of the bicycle chain C.

The wedge clutch 143 of the movable portion 140 may include a clutch body 1430 and a clutch housing 1431, wherein the clutch body 1430 includes, for example, a plurality of wedges W; the pivot 150 penetrates between the wedges W and is stopped by the wedges W to be unable to rotate along the second direction D2. As mentioned above, the pivot shaft 150 can drive the whole wedge clutch 143 to rotate together with the base 142 when rotating in the second direction D2, and the friction force between the wedge clutch 143 and the base 142 can suppress the speed of the rotation of the wedge clutch 143 in the second direction D2, thereby preventing the chain guide 120 from instantly and rapidly rotating in the second direction D2. It can be appreciated that the chain guide 120 may slowly rotate or be stationary in the second direction D2 depending on the amount of static friction between the wedge clutch 143 and the base 142.

Referring to fig. 3 and fig. 4, it should be noted that the movable portion 140 further includes a friction member 144, for example, the friction member 144 is abutted between the wedge clutch 143 and the base 142. Thus, the friction between the wedge clutch 143 and the base 142 is increased, and the pivot 150 is further inhibited from rotating the zipper part 120 along the second direction D2 (shown in fig. 5). Further, the material of the friction member 144 includes, for example, a non-metallic material or a composite material; for example, the non-metallic material may include rubber, silica gel, or other material with a high coefficient of friction, and the composite material may include glass fiber, carbon fiber, or ceramic, but the application is not limited thereto. In addition, the frictional force between the wedge clutch 143 and the base 142 may be affected by the kind of material; for example, in the present embodiment, the clutch body 1430 is disposed in the clutch housing 1431, and the clutch housing 1431 is adapted to abut between the packing 141 and the base 142. The friction member 144 is held between the clutch housing 1431 and the base 142. The material of the clutch housing 1431 may include stainless steel, carbon fiber, or plastic steel, and the material of the base 142 may include aluminum alloy, carbon fiber, or plastic steel (also known as Polyoxymethylene, POM). It will be appreciated that in one embodiment, other materials may be used for the wedge clutch 143 and the base 142 to vary the frictional force, and that in the event that the frictional force is sufficiently high, the friction member 144 may be omitted.

The urging member 141 can adjust the frictional force between the wedge clutch 143 and the base 142. In the present embodiment, the urging member 141 includes a disc spring DS (labeled in fig. 4), for example. The movable portion 140 may further include a housing S1, and the housing S1 is connected to a side of the base 142 near the link portion 130 (shown in fig. 3). The urging member 141 and the wedge clutch 143 are provided in the inner space IS formed by the base 142 and the housing S1. The Belleville spring DS is adapted to be urged between the housing S1 and the sprag clutch 143. In this way, the frictional force between the wedge clutch 143 and the base 142 can be adjusted via the disc spring DS. Specifically, the greater the pressure with which the disc spring DS presses against the wedge clutch 143, the greater the frictional force between the wedge clutch 143 and the base 142; conversely, the less the disc spring DS presses against the wedge clutch 143, the less friction between the wedge clutch 143 and the base 142.

Incidentally, the movable portion 140 may further include a housing S2, and the housing S2 is disposed outside the casing S1. The housing S2 is detachably fixed to the housing S1, for example, so that the housing S2 is detached to adjust the pressing force of the disc spring DS against the wedge clutch 143. However, in an embodiment, the housing S2 may be provided with a pressing member (not shown) connected to the pressing member 141, so that the pressing force of the disc spring DS against the wedge clutch 143 can be adjusted by the pressing member, thereby eliminating the step of disassembling the housing S2.

In the present embodiment, the movable part 140 may further include a pressure adjusting member 145. The housing S1 has, for example, opposite top T and bottom B. Bottom B is attached to base 142 and belleville spring DS is near top T. Incidentally, the bottom B of the present embodiment has an opening, for example, and the wedge clutch 143 may be closer to the bottom B than the disc spring DS. The pressure adjusting member 145 is disposed through the top portion T and adapted to press against the disc spring DS through the top portion T. The pressure adjuster 145 is adapted to move relative to the top portion T to vary the pressure with which the top portion T is pressed against the disc spring DS, thereby varying the frictional force between the wedge clutch 143 and the base 142. Further, a top portion T and a bottom portion B are located at opposite ends of the pivot shaft 150, such as along the axial direction A of the pivot shaft 150, wherein the top portion T may be located between the disc spring DS and the pressure adjustment member 145. On the other hand, the disc spring DS may penetrate the pivot 150 along the axial direction a and abut between the wedge clutch 143 and the top T; the pressure adjustment member 145 is reciprocally movable in the axial direction a and is capable of pressing against the disc spring DS through the top portion T. Thus, pushing the pressure adjusting member 145 toward the top portion T can increase the pressure of the disc spring DS; conversely, the pressure applied to the disc spring DS can be reduced by moving the pressure adjuster 145 away from the top T.

Referring to fig. 4, furthermore, the movable portion 140 may further include at least one pad 146 (also labeled in fig. 3), and the number of the pads 146 in this embodiment is two. The pivot 150 may also be disposed through the top T of the housing S1, and the pivot 150 has a distal end E extending from the top T. The spacer 146 is disposed at the end E. The pressure adjuster 145 has a pressing portion 1450 and a connecting portion 1451 connected thereto. The connecting portion 1451 penetrates the pad 146 and the end E, and the pressing portion 1450 is adapted to press against the top portion T through the pad 146. In short, the pressure adjusting member 145 presses against the top T of the housing S1 via the spacer 146, so that the pressure of the disc spring DS can be adjusted by changing the pressing force of the pressure adjusting member 145 against the spacer 146. Incidentally, the gasket 146 of the present embodiment includes, for example, two gaskets G1 and G2, and the gaskets G1 and G2 are respectively sleeved on the pivot 150 and the connecting portion 1451 of the pressure adjusting element 145, but the present application does not limit the number of the gaskets. In the present embodiment, the pressure adjusting member 145 includes a screw SC, for example, and the end E of the pivot 150 has a screw hole H corresponding to the screw SC. In detail, the pressing portion 1450 may include a head portion of the screw SC, and the connecting portion 1451 may include a tooth portion of the screw SC. However, other embodiments are not limited as to the specific structure of the pressure adjustment member 145.

The movable portion 140 may also include a first seal 147. The first sealing member 147 seals between the base 142 and the housing S1 to prevent moisture from penetrating into the internal space IS, thereby preventing parts from rusting. For example, the first seal 147 of the present embodiment may prevent the wedge clutch 143 from rusting, but other embodiments are not limited thereto. In addition, in the present embodiment, the movable portion 140 may further include a second sealing member 148, and the second sealing member 148 is sealed between the housing S2 and the casing S1 to prevent parts between the housing S2 and the casing S1 from rusting due to moisture infiltration. For example, the second sealing member 148 of the present embodiment may prevent the pressure adjusting member 145 and the packing member 141 from rusting, but the present application is not limited thereto. Similarly, the movable portion 140 further includes a shaft seal 149, for example, and the shaft seal 149 seals between the pivot 150 and the base 142 to prevent moisture from penetrating into the internal space IS. For example, the shaft seal 149 may prevent the wedge clutch 143 from rusting due to moisture infiltration, but the present application is not limited thereto.

In summary, in the bicycle transmission of the present application, the movable portion employs the wedge clutch to limit the rotation direction of the pivot shaft, and further presses the wedge clutch with the urging member. In particular, the wedge clutch is capable of blocking rotation of the pivot shaft in a second direction, such as a chain slack direction. Therefore, when the pivot rotates along the second direction, the pivot drives the wedge clutch to rotate together, and the wedge clutch is pressed by the pressing piece and cannot rotate along the second direction instantly and rapidly. Based on the above, the bicycle derailleur of this application can avoid pivot to drive chain guide portion along the second direction and rotate fast in the twinkling of an eye, and then can prevent that the bicycle chain from relaxing in the twinkling of an eye because of external force.

The above-described embodiments and/or implementations are only for illustrating the preferred embodiments and/or implementations of the technology of the present application, and are not intended to limit the implementations of the technology of the present application in any way, and those skilled in the art can make modifications or changes to other equivalent embodiments without departing from the scope of the technology disclosed in the present application, but should be construed as technology or implementations substantially the same as the present application.

Claims (11)

1. A bicycle shifter, characterized in that the bicycle shifter comprises:

a fixing part, which is suitable for being fixed on a bicycle frame;

a chain guide portion adapted to be coupled with a bicycle chain and guide a driving direction of the bicycle chain;

a connecting rod part connected between the fixing part and the chain guiding part;

a movable portion pivotally connected between the link portion and the chain guide portion, the movable portion comprising:

the urging piece is arranged on one side of the movable part far away from the chain guide part;

a base connected with the chain guide part; and

a wedge clutch disposed between the packing and the base; and

a pivot connected to the movable part and the chain guide part and rotatably passing through the urging part, the wedge clutch and the base, the pivot being adapted to drive the chain guide part to rotate relative to the movable part along a first direction or a second direction;

the wedge clutch is suitable for stopping the pivot shaft from rotating along the second direction, so that the pivot shaft drives the wedge clutch to rotate when rotating along the second direction, and the urging piece is suitable for pressing the wedge clutch towards the base so as to inhibit the pivot shaft from driving the chain guide part to rotate along the second direction.

2. The bicycle shifter of claim 1, wherein the movable portion further includes a friction member that is disposed between the wedge clutch and the base.

3. The bicycle shifter of claim 2, wherein the material of the friction member comprises a non-metallic material or a composite material.

4. The bicycle shifter of claim 2, wherein the wedge clutch includes a clutch body and a clutch housing, the clutch body is disposed in the clutch housing, the clutch housing is adapted to abut between the urging member and the base, the friction member abuts between the clutch housing and the base, the clutch housing is made of stainless steel, carbon fiber or plastic steel, and the base is made of aluminum alloy, carbon fiber or plastic steel.

5. The bicycle shifter of claim 1, wherein the urging member includes a disc spring, the movable portion further includes a housing coupled to a side of the base adjacent to the link portion, the urging member and the wedge clutch are disposed in an interior space formed by the base and the housing, and the disc spring is adapted to be urged between the housing and the wedge clutch.

6. The bicycle shifter of claim 5, wherein the movable portion further comprises a pressure adjustment member, the housing has a top portion and a bottom portion opposite to each other, the bottom portion is connected to the base, the disc spring is adjacent to the top portion, the pressure adjustment member is disposed through the top portion and adapted to press against the disc spring via the top portion, and the pressure adjustment member is adapted to move relative to the top portion to change a pressure of the top portion against the disc spring.

7. The bicycle shifter of claim 6, wherein the movable portion further comprises at least one spacer, the pivot shaft further extends through the top of the housing and has a distal end extending from the top, the spacer is disposed at the distal end, the pressure adjustment member has a pressing portion and a connecting portion connected to each other, the connecting portion extends through the spacer and the distal end, and the pressing portion is adapted to press against the top through the spacer.

8. The bicycle shifter of claim 7, wherein the pressure adjustment member comprises a screw, and the end of the pivot shaft has a threaded hole corresponding to the screw.

9. The bicycle shifter of claim 1, wherein the movable portion further includes a first seal and a housing, the housing is disposed on a side of the base adjacent to the linkage portion, and the urging member and the wedge clutch are disposed in an interior space formed by the base and the housing, the first seal being sealed between the base and the housing.

10. The bicycle shifter of claim 9, wherein the movable portion further comprises a second seal and a housing, wherein the housing is disposed outside the casing, and the second seal seals between the housing and the casing.

11. The bicycle shifter of claim 1, wherein the movable portion further includes a shaft seal sealed between the pivot shaft and the base.

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