CN216153969U - Speed-changing clutch device for bicycle - Google Patents

Abstract

The utility model discloses a bicycle speed change clutch device, which comprises a clutch mechanism, wherein the clutch mechanism comprises a blocking mechanism, the blocking mechanism comprises a guide part and a blocking part, the guide part can rotate along with a middle shaft, the blocking part can move relative to the guide part, and the blocking part is used for driving a change wheel to be separated from or synchronous with the middle shaft through movement; and the switching mechanism is used for driving the blocking piece to move to the set position. This application simple structure through setting up switching mechanism, only needs through the reversal axis, can make to block that the piece moves to setting for the position to all need through manual operation when avoiding the activity piece of stopping at every turn.

Description

Speed-changing clutch device for bicycle

Technical Field

The utility model belongs to the field of bicycle speed change clutch devices, and particularly relates to a bicycle speed change clutch device.

Background

In the existing speed-changing bicycle, a set of chain wheel set is mostly arranged on a rear wheel shaft and/or a middle shaft, then rear pulling and/or front pulling are added, and one set of finger pulling or two sets of finger pulling are added, so that conversion of different speeds is realized.

In order to solve the problem, in some bicycle speed changing mechanisms, a movable blocking mechanism blocks or yields a speed changing wheel so as to realize the separation or synchronization of the speed changing wheel and a middle shaft, but when the blocking mechanism is driven to move, the blocking mechanism needs to be operated manually and directly, and particularly, the speed changing and gear shifting are inconvenient to carry out when a bicycle runs, and the technical problem which needs to be solved in the field is needed urgently.

SUMMERY OF THE UTILITY MODEL

The present invention provides a bicycle speed-changing clutch device to solve the above technical problems.

The technical scheme for solving the technical problems is as follows: a bicycle speed change clutch device comprises a clutch mechanism, wherein the clutch mechanism comprises a blocking mechanism, the blocking mechanism comprises a guide part and a blocking part, the guide part can rotate along with a middle shaft, the blocking part can move relative to the guide part, and the blocking part is used for driving a speed change wheel to be separated from or synchronous with the middle shaft through the movement; and

the switching mechanism is used for driving the blocking piece to move to a set position when the guide piece rotates along with the middle shaft in the reverse direction.

The utility model discloses bicycle variable speed clutch's beneficial effect is: this application simple structure through setting up switching mechanism, can make to stop to move to setting for the position, all need through manual operation when avoiding the piece is stopped in the activity at every turn, realizes also can operate the piece of stopping at the in-process of riding.

In an alternative embodiment, the blocking member is a sliding fit with the guide member.

In an alternative embodiment, the guide is fixed to the crank, and the blocking element is slidable along the guide in a radial direction of the central axis.

In an alternative embodiment, the switching mechanism is configured to actuate the blocking member to the set position only when the guide member rotates in a direction opposite to the rotation direction of the center shaft.

In an alternative embodiment, the switching mechanism includes a movable pressing component, the pressing component is used for guiding the blocking component to slide along the guiding component when the blocking component rotates reversely with the central shaft, and the blocking component can drive the pressing component to move when the blocking component rotates forwardly with the central shaft.

In an optional embodiment, the extrusion assembly includes a limiting member and a rotatable extrusion member, a rotation shaft of the extrusion member is parallel to the central shaft, a transition surface is disposed on one side of the extrusion member facing the central shaft, the transition surface can gradually extrude the blocking member when the blocking member rotates in the reverse direction along with the central shaft, the limiting member is used for preventing the blocking member from driving the extrusion member to rotate when the blocking member rotates in the reverse direction along with the central shaft, and a space is reserved on the limiting member for the blocking member to pass through when the blocking member rotates in the forward direction along with the central shaft.

In an alternative embodiment, the shaft of the extrusion is disposed above the central axis, and the transition surface is an inclined surface that gradually approaches the blocking member in a direction opposite to the direction of rotation of the central axis.

In an optional embodiment, the clutch mechanism further comprises a positioning component and a reset component, the reset component is used for driving the blocking member to reset, and the positioning component is used for positioning the blocking member to a position capable of driving the change gear to be separated from or synchronized with the middle shaft when the blocking member is reset from the set position.

In an optional embodiment, the positioning assembly includes a sliding groove and a positioning groove, and a positioning block disposed on the blocking member, the positioning block is in sliding fit with the sliding groove, and the positioning block can be driven to sequentially switch between the sliding groove and the positioning groove when the blocking member is reset from the set position.

In an optional embodiment, the positioning grooves are disposed in the sliding groove, the sliding groove includes a reset portion and a plurality of guide portions, the reset portion is connected with each positioning groove through a guide portion, the positioning block is hinged to the blocking member through a swing rod, and the blocking member can drive the positioning block to sequentially pass through the guide portions when being reset from the set position.

In an alternative embodiment, the return assembly includes a return spring, and both ends of the return spring are respectively connected with the guide member and the blocking member.

Drawings

FIG. 1 is an exploded view of an embodiment of the present application without a switching mechanism;

FIG. 2 is an assembled view of an embodiment of the present application;

FIG. 3 is a diagram of the position of the blocking member and the pressing member in the case of forward movement of the center shaft according to the embodiment of the present application;

FIG. 4 is a diagram of the position relationship between the blocking member and the pressing member when the central axle is moved in the reverse direction according to the embodiment of the present application;

FIG. 5 is a schematic view of the crank and mid-shaft portions of an embodiment of the present application;

FIG. 6 is a schematic view of a baffle in an embodiment of the present application;

FIG. 7 is a front view of an embodiment of the present application without a switching mechanism;

FIG. 8 is an enlarged view taken at A in FIG. 7 with the gearbox wheel disengaged from the bottom bracket axle;

FIG. 9 is an enlarged view taken at A in FIG. 7 with the change gear synchronized with the bottom bracket;

FIG. 10 is a schematic chain view of each of the change wheels in the embodiment having a plurality of change wheels;

description of reference numerals:

11. a middle shaft; 12. a flywheel; 13. a chain; 14. a crank;

21. a change wheel; 211. a speed change shaft; 22. a fixed wheel;

31. a bump; 32. a guide member; 33. a blocking member; 34. a chute; 341. a reset section; 342. a guide section; 35. positioning a groove; 36. positioning blocks; 37. a swing rod;

41. an extrusion; 411. a transition surface; 42. and a limiting member.

Detailed Description

The principles and features of this application are described below in conjunction with the drawings and the embodiments, which are set forth to illustrate the application and not to limit the scope of the application.

The following discloses many different embodiments or examples for implementing the subject technology described. While specific examples of one or more arrangements of features are described below to simplify the disclosure, the examples should not be construed as limiting the present disclosure, and a first feature described later in the specification in conjunction with a second feature can include embodiments that are directly related, can also include embodiments that form additional features, and further can include embodiments in which one or more additional intervening features are used to indirectly connect or combine the first and second features to each other so that the first and second features may not be directly related.

As seen in fig. 1 to 10, the present application discloses an embodiment of a bicycle shift clutching device that includes a clutching mechanism and a switching mechanism.

The clutch mechanism comprises a blocking mechanism, the blocking mechanism comprises a guide part 32 and a blocking part 33, the guide part 32 can rotate along with the middle shaft 11, the blocking part 33 can move relative to the guide part 32, and the blocking part 33 is used for driving the change gear 21 to be separated from or synchronous with the middle shaft 11 through movement.

For example, an embodiment in which the speed changing wheels 21 are separated or synchronized in a bicycle shifting mechanism including a power input mechanism and a drive pulley will be described with reference to the present application.

Wherein, the power input mechanism comprises a middle shaft 11 for mounting a crank 14, the application defines the direction that the middle shaft 11 can drive the motor vehicle wheels to move when rotating as the positive rotation of the middle shaft, and vice versa, the driving wheel comprises a fixed wheel 22 and a plurality of speed change wheels 21, the speed change wheels 21 are all arranged coaxially with the central shaft 11, wherein the diameter of the fixed wheel 22 is smaller than that of all the speed change wheels 21, i.e. the transmission ratio of the fixed wheel 22 is smaller than that of all the variable wheels 21, the fixed wheel 22 is directly and fixedly connected with the middle shaft 11, so that the fixed wheel 22 can always rotate synchronously with the central shaft 11, the variable wheel 21 can rotate relative to the central shaft 11, for example, a bearing is sleeved in the middle part of the variable-speed wheel 21, the variable-speed wheel 21 can be connected with the middle shaft 11 through the bearing, so that the gear wheel 21 does not rotate with the bottom bracket 11 without applying an external force to the gear wheel 21.

Each speed change wheel 21 is provided with a synchronous structure, and the blocking member 33 in the blocking mechanism disclosed by the application blocks or shifts the synchronous structure to realize the synchronization or separation of the speed change wheel 21 and the central shaft 11.

It will be appreciated that when the above-mentioned number of the transmission wheels 21 is two or more, the transmission ratio of each transmission wheel 21 is different, and the blocking member 33 of the blocking mechanism is movable to block or yield the synchronizing structure on each transmission wheel 21 when rotated, i.e., in some examples, the blocking member 33 is movable to block or yield only any one of the transmission wheels 21.

When the power input mechanism is combined with a bicycle, the power input mechanism can further comprise an input shaft and a plurality of flywheels 12 sleeved on the input shaft, for example, the input shaft can be a wheel shaft of the bicycle itself, or an input shaft which is separately arranged between the wheel shaft and the middle shaft 11 and is connected with the flywheels 12 on the bicycle wheel shaft through a chain 13, wherein the flywheels 12 on the input shaft as the power input mechanism correspond to the fixed wheels 22 and the variable wheels 21 one by one, the fixed wheels 22 and the variable wheels 21 are used for driving the corresponding flywheels 12 to rotate, and for example, the flywheels 12 can be connected with the corresponding fixed wheels 22 or the variable wheels 21 through the chain 13, gears or a self-meshing manner. When one or more speed change wheels 21 rotate along with the central shaft 11, the speed change wheels 21 and the fixed wheels 22 with smaller transmission ratio can drive the corresponding flywheels 12 to idle due to the flywheels 12, so that the speed change wheels 21 with larger transmission ratio can not influence the rotation of the input shaft.

In a more specific example, the middle shaft 11 is connected to the crank 14, wherein the synchronizing structure includes a plurality of protrusions 31 fixed to a side of the gearbox wheel 21 close to the crank 14, and when the gearbox wheel 21 includes a plurality of protrusions 31, as shown in fig. 5 and 6, the guide 32 is provided on the crank 14, the blocking member 33 is slidably engaged with the guide 32, and the blocking member 33 can block or give way the protrusions 31 by sliding, and more specifically, the guide 32 is fixed to the crank 14 in a radial direction of the gearbox wheel 21, the blocking member 33 can slide in a radial direction of the gearbox wheel 21, the blocking member 33 is provided with a synchronizing section and a separating section, and the protrusions 31 can be located on a rotation path of the synchronizing section or the separating section by sliding the blocking member 33, for example, the guide 32 can be a sleeve fixed to the crank 14 and extending in a radial direction of the gearbox wheel 21, the blocking member 33 is a blocking rod slidably sleeved in the sleeve, the blocking rod is provided with a notch as a synchronous area, the notch and the projection 31 can be staggered or opposite to each other through sliding the blocking rod, so as to block or give way the projection 31, in the embodiment with a plurality of speed change wheels 21, the projection 31 on each speed change wheel 21 is arranged from the middle shaft 11 to the outside in the radial direction according to the transmission ratio from small to large, in order to prevent the speed change wheels 21 from interfering with each other, the speed change wheels 21 are provided with speed change shafts 211 projecting towards the crank 14, the speed change shafts 211 are sleeved with each other through bearings, so that the speed change wheels 21 and the speed change shafts 211 can rotate relatively, considering the situation that the size of the speed change wheels 21 with large transmission ratio is large, in a specific example, the blocking member can be sequentially sleeved through the bearings according to the transmission ratio of the speed change wheels 21 from large to small and away from the middle shaft 11, the protrusions 31 are provided on the sides of the shift shafts 211 facing the cranks 14, so that when one of the protrusions 31 is stopped by the stopper 33, the other shift wheels 21 and the chain 13 attached to the shift wheel 21 are not disturbed.

The switching mechanism disclosed in the present application is used to actuate the blocking member 33 to a set position, and the switching mechanism may be a device capable of pushing the blocking member 33 to move, and the set position may be, but is not limited to, a position where the blocking member 33 blocks or yields the bump.

The clutch mechanism further comprises a resetting component and a positioning component, wherein the resetting component is used for driving the blocking piece 33 to reset, and the positioning component is used for positioning the blocking piece 33 to a position which can separate or synchronize the speed changing wheel 21 from the middle shaft 11 when the blocking piece 33 is reset from a set position.

For the convenience of description, the pressing assembly, the positioning assembly and the returning assembly are respectively described below, and for the convenience of description, the clockwise direction is taken as the direction in which the central shaft 11 rotates in the forward direction, and the counterclockwise direction is taken as the direction in which the central shaft 11 rotates in the reverse direction.

In some specific examples, the switching mechanism is configured to actuate the blocking member 33 to a set position when the guiding member 32 rotates in a direction opposite to the central axis 11, as shown in fig. 2 to 3, the pressing assembly includes a limiting member 42 and a rotatable pressing member 41, a rotation axis of the pressing member 41 is parallel to the central axis 11, a transition surface 411 is disposed on a side of the pressing member 41 facing the central axis 11, the transition surface 411 gradually presses the blocking member 33 when the blocking member 33 rotates counterclockwise around the central axis 11 and passes through the transition surface 411, for example, the transition surface 411 is a slope gradually approaching the blocking member 33 in a counterclockwise direction with the central axis 11 as a center, more specifically, the pressing member 41 is generally triangular, the transition surface 411 is a hypotenuse facing a side of the blocking member 33, and when the blocking member 33 rotates counterclockwise around the central axis 11 and passes through the transition slope, the blocking member 33 moves along the transition slope, forcing it to slide along the guide 32.

The limiting member 42 is used to prevent the blocking member 33 from driving the extrusion member 41 to rotate when rotating reversely along with the central axis 11, for example, the limiting member 42 may be a baffle plate, the extrusion member 41 abuts against one side of the baffle plate, the rotation axis of the extrusion member 41 is used as a circle center, and the baffle plate is located on one side of the extrusion member 41 in the clockwise direction, specifically, as shown in fig. 3, when the blocking member 33 rotates counterclockwise around the central axis 11, the baffle plate abuts against one side of the extrusion member 41 in the clockwise direction, so that the clockwise rotation of the extrusion member 41 can be prevented to play a limiting role.

As shown in fig. 4, the limiting member 42 has a space for the blocking member 33 to pass through when rotating clockwise along with the central axis 11, for example, the transition surface 411 is closer to the central axis 11 than the limiting member 42, when the blocking member 33 rotates clockwise around the central axis 11, the blocking member 33 can pass through the limiting member 42 to approach one side of the central axis 11, and then the extrusion member 41 is driven to rotate,

in some more preferred examples, the shaft of the pressing member 41 is disposed above the central shaft 11, and in this example, the pressing member 41 can be automatically reset under the action of gravity after the blocking member 33 rotates along with the central shaft 11 in the forward direction to drive the pressing member 41 to rotate.

It should be understood that, in some examples, the compression assembly may also be coupled to the bicycle via a sliding member, the slide member may be, but not limited to, a slide rail or the like, and specifically, a slide member formed by disposing the pressing member 41 at a distal end thereof in a counterclockwise direction from the central axis, for example, when the pressing member 41 is disposed above the center shaft 11, the pressing member 41 is located on the left side of the slide member, and when the blocking member 33 is reversed with the center shaft 11, since the pressing member 41 is located at the end portion on the left side of the sliding member, at this time, the pressing member 41 is restricted from sliding, the blocking member 33 is guided by the pressing member 41 to move toward the center axis while passing through the pressing member 41, when the blocking member 33 rotates clockwise with the central shaft 11, the blocking member can push the pressing member 41 to slide out of the rotational radius of the blocking member 33 toward the right side along the sliding member, in this embodiment, a resilient member may also be provided within the slide member to urge the presser 41 to return.

In a more specific example, the positioning assembly includes a sliding slot 34 and a positioning slot 35 formed on the crank 14, wherein a positioning block 36 is mounted on the blocking member 33, the positioning block 36 is slidably engaged in the sliding slot 34, when the blocking member 33 is reset from the set position, the sliding slot 34 can guide the positioning block 36 to the positioning slot 35 or from the positioning slot 35 to the sliding slot 34, the positioning block 36 can move according to the sequence of the positioning slot 35 and the sliding slot 34, and when the positioning block 36 is located in the positioning slot 35, the blocking member 33 is used for blocking the protrusion 31.

Specifically, the positioning slot 35 is offset from the sliding slot 34 by an angle, the positioning block 36 can slide towards the positioning slot 35 when sliding along the sliding slot 34, so as to enter into the positioning slot 35, in order to enable the positioning block 36 to be offset from the sliding slot 34 and enter into the positioning slot 35 when sliding along the sliding slot 34, the positioning block 36 is hinged with the guiding element 32 through the swing link 37, in a more specific example, as shown in fig. 5 and 7, the positioning slot 35 is one or more specific points in the sliding slot 34, the sliding slot 34 includes a reset portion 341 and a guiding portion 342, the reset portion 341 and the positioning slot 35 are connected through a blocking portion, the positioning block 36 is hinged with the blocking element 33 through the swing link 37, the blocking element 33 can drive the positioning block 36 to sequentially pass through the guiding portion 342 each time of being reset from a set position, for example, in a specific example, the sliding slot 34 may be arrow-shaped in an overall structure, with a tip facing away from the central axis 11, the present application defines the arrow tail depression as a positioning slot 35, in which case, each time the blocking member 33 reciprocates along the guide member 32, the swing link 37 can drive the positioning hole to circularly move along the whole annular groove body formed by the sliding groove 34 and the positioning groove 35, and then sequentially enter the positioning groove 35 and the sliding groove 34 to realize the switching of different positions, when a plurality of speed change wheels 21 are provided, the positioning groove 35 can be correspondingly arranged in a plurality, the tail part of the arrow of the sliding chute 34 can be arranged into a plurality of inverted V-shaped structures, the distance from each inverted V-shaped structure to the central axis 11 is different, in positioning, the end points of each inverted V shape can be used as different positioning grooves 35, so that after each reciprocating movement of the blocking member 33, the stoppers 33 are sequentially switched in the respective positioning grooves 35 such that the stoppers 33 block the protrusions 31 of the different transmission wheels 21. When the positioning block 36 is located in different positioning grooves 35, the blocking rod can block different speed change wheels 21.

It should be understood that, in some other embodiments, the positioning component may also be a structure similar to a button portion of a pen, and a specific structure thereof may refer to chinese patent document CN87104631A, which is not described herein in detail.

In some examples, the reset component may be a reset spring sleeved outside the blocking member 33, the reset spring is connected to both the blocking member 33 and the guiding member 32, in the example where the sliding groove 34 is an arrow as a whole, the reset spring is used to drive the blocking member 33 away from the central axis 11, so that when the positioning block 36 is located in the sliding groove 34, the reset component is used to drive the blocking member 33 to give way to the protrusion 31, and when the positioning block 36 is located in the positioning groove 35, the reset component is used to support the blocking member 33.

The working principle of the application is as follows, when riding normally, the blocking piece 33 is at the position of abdicating the convex block 31 on the speed-changing wheel 21, at this time, the speed-changing wheel 21 is separated from the middle shaft 11, the crank 14 drives the middle shaft 11 to rotate, the middle shaft 11 drives the fixed wheel 22 to rotate, and further drives the input shaft to rotate, the bicycle is at the state of low rotating speed and labor saving at this time, when the riding speed needs to be improved, the pedal is treaded reversely, the middle shaft 11 drives the guide piece 32 and the blocking piece 33 to rotate reversely along with the middle shaft 11 and pass through the extrusion piece 41, the blocking piece 33 moves to the set position along the guide piece 32 under the guide of the extrusion piece 41, after passing through the extrusion piece 41, the blocking piece 33 is reset from the set position under the action of the reset mechanism, at this time, due to the existence of the positioning component, the positioning component positions the blocking piece 33 to the position capable of blocking the convex block 31, at this time, the speed-changing wheel 21 rotates along with the middle shaft 11, the flywheel 12 connected with the fixed wheel 22 idles, so that the variable speed wheel 21 and the middle shaft 11 are synchronized, the bicycle is in a laborious high rotating speed state, when the middle shaft 11 is reversed again, the blocking piece 33 reciprocates again under the driving of the extrusion piece 41 and the reset mechanism, at the moment, the blocking piece 33 is guided into the sliding groove 34 by the positioning assembly, so that the variable speed wheel 21 is separated from the middle shaft 11, and in the embodiment with a plurality of variable speed wheels 21, the blocking piece 33 can be guided into the next positioning groove 35 by the positioning assembly, so that the control of different variable speed wheels 21 is realized.

The transmission mechanism is simple in structure and low in manufacturing cost, the switching mechanism is arranged, the manual movable blocking piece 33 is not needed, the blocking piece 33 can be driven to move only by reversely driving the crank 14 when the middle shaft 11 rotates reversely, and then the blocking piece 33 controls the transmission wheel 21 to be synchronous with or separate from the middle shaft 11.

In the description of the present specification, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present specification.

In the description of this specification, "plurality" means at least two, such as two, three, etc., and "several" means one and more, such as one, two, etc., unless specifically limited otherwise.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The terms used in the present specification are those general terms currently widely used in the art in consideration of functions related to the present disclosure, but they may be changed according to the intention of a person having ordinary skill in the art, precedent, or new technology in the art. Also, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the specification should not be construed as simple names but based on the meanings of the terms and the overall description of the present disclosure.

Flowcharts or text are used in this specification to illustrate the operational steps performed in accordance with embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order recited. Rather, the various steps may be processed in reverse order or simultaneously, as desired. Meanwhile, other operations may be added to the processes, or a certain step or several steps of operations may be removed from the processes.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A bicycle speed change clutch device is characterized by comprising a clutch mechanism, wherein the clutch mechanism comprises a blocking mechanism, the blocking mechanism comprises a guide part and a blocking part, the guide part can rotate along with a middle shaft, the blocking part can move relative to the guide part, and the blocking part is used for driving a change wheel to be separated from or synchronous with the middle shaft through movement; and

the switching mechanism is used for driving the blocking piece to move to a set position.

2. The bicycle shift clutch device according to claim 1, wherein the blocking member is in sliding engagement with the guide member.

3. The bicycle shift clutch device according to claim 2, wherein the guide member is fixed to the crank, and the blocking member is slidable along the guide member in a radial direction of the bottom bracket axle.

4. The bicycle shift clutch device according to any one of claims 1 to 3, wherein the switching mechanism is configured to actuate the blocking member to the set position only when the guide member rotates in a reverse direction with the bottom bracket axle.

5. The bicycle shift clutch assembly according to claim 4, wherein the switching mechanism includes a movable biasing member for guiding the blocking member to slide along the guide member when the blocking member rotates in a reverse direction with the bottom bracket axle, and for moving the biasing member when the blocking member rotates in a forward direction with the bottom bracket axle.

6. The bicycle shifting clutch apparatus according to claim 5, wherein the pressing member includes a limiting member and a rotatable pressing member, the rotation axis of the pressing member is parallel to the bottom bracket axle, a transition surface is disposed on a side of the pressing member facing the bottom bracket axle, the transition surface can gradually press the blocking member when the blocking member rotates in a reverse direction with the bottom bracket axle, the limiting member is used to prevent the blocking member from driving the pressing member to rotate when the blocking member rotates in a reverse direction with the bottom bracket axle, and a space is left in the limiting member for the blocking member to pass through when the blocking member rotates in a forward direction with the bottom bracket axle.

7. The bicycle shift clutch assembly according to claim 6, wherein the shaft of the pressing member is disposed above the bottom bracket axle, and the transition surface is a sloped surface that gradually approaches the blocking member in a direction opposite to the rotation direction of the bottom bracket axle.

8. The bicycle shift clutch device according to any one of claims 1 to 3, wherein the clutch mechanism further includes a reset assembly for resetting the blocking member and a positioning assembly for positioning the blocking member to a position that can drive the shift wheel to be disengaged from or synchronized with the bottom bracket axle when the blocking member is reset from the set position.

9. The bicycle shift clutch device according to claim 8, wherein the positioning assembly includes a slide slot and a positioning slot, and a positioning block disposed on the blocking member, the positioning block being slidably engaged with the slide slot, the positioning block being movable to sequentially switch between the slide slot and the positioning slot when the blocking member is reset from the set position.

10. The bicycle shift clutch device according to claim 9, wherein the positioning grooves are disposed in the sliding grooves, the sliding grooves include a reset portion and a plurality of guide portions, the reset portion is connected to each of the positioning grooves via the guide portions, the positioning block is hinged to the blocking member via a swing link, and the blocking member can drive the positioning block to sequentially pass through the guide portions when being reset from the set position.

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