Bicycle gear shifting mechanism

Abstract

The utility model relates to a bicycle gear shifting mechanism, which aims at solving the problem of inconvenience in gear shifting caused by gear shifting vacancy of bicycle control equipment, and comprises a connecting shaft, and a pull wire disc, a driving disc and a gear shifting mechanism which are arranged on the connecting shaft, and the pull wire disc is connected with a variable-speed cable and is used for tensioning the variable-speed cable; the driving disc and the wire pulling disc are fixedly connected and rotate synchronously, the gear entering mechanism comprises a rotating disc and an extending handle which are connected, the rotating disc is connected to the connecting shaft, braking teeth are arranged on the driving disc, a shifting piece is arranged on the rotating disc, and the shifting piece can be matched with the braking teeth so that the rotating disc and the driving disc can generate linkage through the shifting piece; when the rotating disc rotates, the driving disc is driven to rotate in the first direction, and the extending handle extends in the radial direction of the rotating disc and abuts against the forward gear handle. The wire pulling disc, the driving disc and the forward gear mechanism are coaxially arranged, elastic force provided by the spring enables the rotating disc and the extending handle to return, the extending handle and the forward gear handle can abut against each other all the time, and the clearance is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of bicycle accessories, especially relates to a bicycle gear shifting mechanism. BACKGROUND

[0002] At present, the bicycle derailleur on the market, in the operation process, especially when carrying out the operation of advancing, there is a problem called "virtual position" universally. So-called virtual position refers to when trying to switch from low gear to high gear, the derailleur does not respond immediately and lock to the new gear, but needs the rider to continue to move the derailleur handle, so that it moves a larger angle and can form a trigger action, and then completes a gear advance. This phenomenon, although it can be gradually overcome through adaptation for most riders, but for the rider with small hand size or limited strength, it brings additional operation difficulty and inconvenience. Because it needs to exert more force or adjust larger amplitude of hand action to complete the gear advance, this not only affects the fluency and efficiency of riding, but also can cause hand fatigue or discomfort in the long-time riding process.

[0003] For professional riders or leisure enthusiasts who pursue precise control and riding experience, this virtual position problem undoubtedly reduces the overall riding satisfaction. Therefore, there is a continuous demand and expectation in the market for new bicycle derailleur that can reduce virtual position and realize more direct and smooth gear shifting experience. SUMMARY

[0004] In view of the problem that the bicycle control device has gear advance virtual position, the utility model provides a bicycle gear shifting mechanism, which effectively reduces the virtual position by extending the handle and the gear advance handle always being in contact.

[0005] The utility model adopts the technical scheme as follows: a bicycle gear shifting mechanism, including a connecting shaft and the pull line disc, drive disc and gear advance mechanism that are arranged on the connecting shaft, the pull line disc is connected with derailleur cable, is used for tensioning derailleur cable, the drive disc is fixedly connected with the pull line disc and rotates synchronously, the gear advance mechanism includes the rotary disc and the extension handle that are connected, the rotary disc is connected on the connecting shaft, the drive disc is equipped with the brake tooth, the rotary disc is equipped with a paddle, the paddle provides the elastic force through the paddle torsional spring, the paddle can be matched at the brake tooth, so that the rotary disc and drive disc are connected through the paddle, and then the rotary disc rotates and drives the drive disc to rotate along the first direction, the torsional spring is sleeved on the connecting shaft, so that the extension handle and rotary disc reset, the extension handle extends along the radial direction of the rotary disc.

[0006] The pull wire disc, the driving disc and the gear shifting mechanism are coaxially arranged, the elastic force provided by the torsion spring not only enables the rotating disc and the extension handle to return, but also enables the extension handle and the gear shifting handle to always be in contact, and the pawl is always in contact with the brake tooth during the gear shifting process, thereby effectively reducing the idle position. This not only considers the accuracy and stability of mechanical transmission, but also takes into account the ergonomics, so as to ensure that all riders, regardless of hand size, can easily and accurately complete the gear shifting operation.

[0007] Further, the bicycle gear shifting mechanism further comprises a gear back mechanism, the gear back mechanism comprises a gear back pawl, the gear back pawl is in contact with the side of the pawl, when the gear is back shifted, the gear back pawl rotates and pushes the pawl under the action of external force, so that the pawl moves along the brake tooth, so that the driving disc rotates in the second direction, and in turn drives the pull wire disc to rotate in the second direction, wherein the second direction is opposite to the first direction. The gear back pawl in the gear back mechanism is arranged on the side of the pawl, and the gear back shifting is realized by driving the pawl.

[0008] Further, the driving disc is provided with a gear back tooth, the gear back tooth is arranged on the side of the driving disc, a gear back pawl is arranged on the side of the driving disc and cooperates with the gear back tooth, the gear back pawl is coaxially arranged with the gear back pawl and rotates in the opposite direction, so that the gear back shifting and unlocking are simultaneously performed.

[0009] Further, a positioning disc is arranged between the driving disc and the rotating disc, a fixed sheet is arranged on the connecting shaft, the positioning disc is connected with the fixed sheet through a rotating shaft, and the gear back pawl and the gear back pawl are arranged in opposite directions on the rotating shaft.

[0010] Further, the gear back handle comprises a hand holding part and a linkage part connected with each other, the linkage part is arranged close to the gear back pawl, and when the hand holding part is driven by external force, the linkage part drives the gear back pawl to push the pawl away.

[0011] Further, the extension handle and the gear back handle have different moving directions, and the moving directions of the two are preferably perpendicular. This arrangement facilitates the differentiation between the gear shifting and the gear back shifting actions.

[0012] Further, the fixed sheet is provided with a fixed foot to fix the fixed sheet.

[0013] Further, the rotating disc is provided with a recess, the extension handle is sleeved on the connecting shaft and embedded in the recess. The recess can facilitate the preliminary positioning of the extension handle and effectively prevent displacement or disengagement.

[0014] Further, the rotating disc is provided with a cover plate, the cover plate is provided with a through hole, the tab is provided with a protruding part, the protruding part extends out of the through hole and is limited by the through hole. The tab needs a certain swing space when moving, the inner wall of the through hole can limit the swing range of the tab, prevent the swing angle from being too large or too small, the swing angle being too small can cause gear shifting failure, and the swing angle being too large can cause tooth slipping and unable to realize one gear shift at a time.

[0015] The utility model has the beneficial effect that: the application is a bicycle gear shifting mechanism, the pull wire disc, the driving disc and the gear shifting mechanism are coaxially arranged, the elastic force provided by the spring not only makes the rotating disc and the extension handle return, but also makes the extension handle and the gear shifting handle always contact, and the tab always contacts the brake tooth during the gear shifting process, effectively reducing the idle position. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 4 is a structural schematic view of the gear shifting mechanism;

[0017] Figure 2 Fig. 5 is a structural schematic view of the gear shifting mechanism;

[0018] Figure 3 Fig. 6 is an assembly structural schematic view of the bicycle gear shifting mechanism of the application;

[0019] Figure 4 Fig. 7 is an assembly structure of the positioning disc and the fixed sheet;

[0020] Figure 5 Fig. 8 is a structural schematic view of the gear shifting handle;

[0021] In the figure: 1-connection shaft; 2-pull wire disc; 3-driving disc; 31-brake tooth; 32-retaining tooth; 4-rotating disc; 41-tab; 411-protruding part; 42-cavity; 43-cover plate; 431-through hole; 44-tab torsion spring; 5-extension handle; 6-torsion spring; 7-gear shifting pawl; 71-protrusion; 8-retaining pawl; 9-positioning disc; 10-fixed sheet; 101-fixed foot; 11-rotation shaft; 111-return spring; 12-gear shifting handle; 121-hand holding part; 122-linkage part. DETAILED DESCRIPTION

[0022] The technical scheme of the embodiment of the utility model will be explained and described in combination with the drawings of the utility model, but the following embodiment is only the preferred embodiment of the utility model, not all. Based on the embodiment in the embodiment, other embodiments obtained by the person skilled in the art without making creative labor all belong to the protection scope of the utility model.

[0023] A bicycle shifting mechanism, such as Figures 1 to 5 As shown, the device includes a connecting shaft 1 and a cable reel 2, a drive disc 3, and a shifting mechanism mounted on the connecting shaft 1. The cable reel 2 is connected to the gear shift cable and is used to tension the gear shift cable. The drive disc 3 is fixedly connected to the cable reel 2 and rotates synchronously. The shifting mechanism includes a connected turntable 4 and an extension handle 5. The turntable 4 is connected to the connecting shaft 1. The drive disc 3 is provided with a brake tooth 31. The turntable 4 is provided with a paddle 41. The paddle 41 is provided with elastic force through a paddle torsion spring 44. The paddle 41 can engage with the brake tooth 31 so that the turntable 4 and the drive disc 3 are linked through the paddle 41. Thus, when the turntable 4 rotates, it drives the drive disc 3 to rotate in a first direction. A torsion spring 6 is sleeved on the connecting shaft 1 so that the extension handle 5 and the turntable 4 return to their original positions. The extension handle 5 extends radially along the turntable 4.

[0024] The cable reel 2, drive disc 3, and shift mechanism are coaxially arranged. The torsion spring 6 provides elasticity that allows the turntable 4 and extension handle 5 to return to their original positions, while also ensuring that the extension handle 5 and shift handle are always in contact. Furthermore, the paddle shifter remains in contact with the brake teeth during shifting, effectively reducing play. This design not only considers the precision and stability of the mechanical transmission but also takes ergonomics into account, ensuring that all riders, regardless of hand size, can easily and accurately perform shifting operations.

[0025] The bicycle shifting mechanism also includes a de-shifting mechanism, which includes a de-shifting pawl 7 and a de-shifting handle 12. The de-shifting pawl 7 and the de-shifting handle 12 are linked. The de-shifting pawl 7 abuts against the side of the paddle 41. When de-shifting, the de-shifting pawl 7 rotates under external force and pushes the paddle 41, causing the paddle 41 to move along the brake tooth 31. This causes the drive disc 3 to rotate in a second direction, which in turn causes the cable pull disc 2 to rotate in a second direction, where the second direction is opposite to the first direction. The de-shifting pawl 7 in the de-shifting mechanism is located on the side of the paddle 41 and achieves de-shifting by driving the paddle 41.

[0026] The drive disk 3 is provided with anti-reverse teeth 32, which are disposed on the side of the drive disk 3. Anti-reverse claws 8 are disposed on the side of the drive disk 3 and cooperate with the anti-reverse teeth 32. The anti-reverse claws 8 and the retraction claws 7 are coaxially arranged and rotate in opposite directions to achieve simultaneous retraction and unlocking. This reduces retraction resistance and the external force required for retraction, thus preventing damage to the retraction claws 7. The retraction claws 7 are provided with protrusions 71, which surround the side of the anti-reverse claws 8. When the retraction claws 7 are touched, the protrusions 71 push the anti-reverse claws 8 to swing.

[0027] The driving disc 3 and the rotating disc 4 are provided with a positioning disc 9, the connecting shaft 1 is provided with a fixed sheet 10, the positioning disc 9 is connected with the fixed sheet 10 through a rotating shaft 11, the reverse gear pawl 7 and the stop pawl 8 are reversely arranged on the rotating shaft 11, the rotating shaft 11 is provided with a return spring 111, and the reverse gear pawl 7 and the stop pawl 8 are returned through the return spring 111. In the embodiment, the positioning disc 9 is arranged on the outer side of the connecting shaft 1, so that the positioning sheet and the fixed sheet 10 enclose the driving disc 3 and the rotating disc 4 from both sides, and the structure is effectively prevented from being loose.

[0028] The reverse gear handle 12 comprises a hand holding part 121 and a linkage part 122 connected with each other, the linkage part 122 is arranged close to the reverse gear pawl 7, when the hand holding part 121 is driven by external force, the linkage part 122 drives the reverse gear pawl 7 to push away the shifting piece 41. In the embodiment, a positioning shaft and a return member can be arranged at the connection position of the hand holding part 121 and the linkage part 122, so as to return the reverse gear handle 12 and provide continuous elastic force.

[0029] The moving direction of the extension handle 5 is different from that of the reverse gear handle 12, and the moving directions of the two are preferably perpendicular. The arrangement facilitates the differentiation between the actions of gear shifting and gear reversing, and effectively prevents misoperation.

[0030] The fixed sheet 10 is provided with a fixed foot 101, so as to fix the fixed sheet 10. The arrangement facilitates the fixing of the whole mechanism as a whole, for example, the fixing in the inner part of a shell, and the whole mechanism is not easy to shake as a whole.

[0031] The rotating disc 4 is provided with a recess 42, the extension handle 5 is sleeved on the connecting shaft 1 and embedded in the recess 42. The arrangement of the recess 42 facilitates the preliminary positioning of the extension handle 5, and effectively prevents displacement or disengagement.

[0032] The rotating disc 4 is provided with a cover plate 43, the cover plate 43 is provided with a through hole 431, the shifting piece 41 is provided with a protruding part 411, the protruding part 411 extends out of the through hole 431 and is limited by the through hole 431. The shifting piece 41 needs a certain swing space when moving, the inner wall of the through hole 431 can limit the swing range of the shifting piece 41, so as to prevent the shifting piece 41 from swinging at too large or too small angle, the too small angle may cause gear shifting failure, and the too large angle may cause tooth slipping and failure to realize one-gear shifting at one time.

[0033] In the embodiment, the extension handle 5 can be directly contacted when gear shifting is operated, or the gear shifting is operated through an additionally arranged gear shifting handle. When the gear shifting handle is adopted for operation, the extension handle 5 is in contact with the gear shifting handle.

[0034] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification not deviating from the function and structural principle of the present application will be included in the scope of the claims.

Claims

1. A bicycle shifting mechanism, characterized in that, The bicycle gear shifting mechanism comprises a connecting shaft (1), a cable disc (2), a driving disc (3) and a gear shifting mechanism, the cable disc (2) is connected with a gear shifting cable and used for tensioning the gear shifting cable, the driving disc (3) is fixedly connected with the cable disc (2) and rotates synchronously, the gear shifting mechanism comprises a rotating disc (4) and an extension handle (5), the rotating disc (4) is connected with the connecting shaft (1), the driving disc (3) is provided with a brake tooth (31), the rotating disc (4) is provided with a shifting piece (41), the shifting piece (41) is provided with elastic force by a shifting piece torsion spring (44), the shifting piece (41) is matched with the brake tooth (31) so that the rotating disc (4) and the driving disc (3) are connected by the shifting piece (41) and the rotating disc (4) drives the driving disc (3) to rotate in a first direction.

2. The bicycle shifting mechanism of claim 1, wherein, The bicycle gear shifting mechanism further comprises a gear shifting mechanism, the gear shifting mechanism comprises a gear shifting claw (7), the gear shifting claw (7) is in contact with the side of the shifting piece (41), when the gear shifting claw (7) rotates and pushes the shifting piece (41) under the action of external force, the shifting piece (41) moves along the brake tooth (31) so that the driving disc (3) rotates in a second direction and the cable disc (2) rotates in the second direction, wherein the second direction is opposite to the first direction.

3. The bicycle shifting mechanism of claim 2, wherein, The driving disc (3) is provided with a gear shifting claw (32), the gear shifting claw (32) is arranged on the side of the driving disc (3), a gear shifting claw (8) is arranged on the side of the driving disc (3) and matched with the gear shifting claw (32), the gear shifting claw (8) is coaxially arranged with the gear shifting claw (7) and rotates reversely.

4. The bicycle shifting mechanism of claim 3, wherein, The driving disc (3) and the rotating disc (4) are provided with a positioning disc (9), the connecting shaft (1) is provided with a fixed sheet (10), the positioning disc (9) is connected with the fixed sheet (10) through a rotating shaft (11), the gear shifting claw (7) and the gear shifting claw (8) are reversely arranged on the rotating shaft (11).

5. The bicycle shifting mechanism of claim 4, wherein, The gear shifting mechanism further comprises a gear shifting handle (12), the gear shifting handle (12) comprises a hand holding part (121) and a linkage part (122), the linkage part (122) is arranged close to the gear shifting claw (7), when the hand holding part (121) is driven by external force, the linkage part (122) drives the gear shifting claw (7) to push away the shifting piece (41).

6. The bicycle shifting mechanism of claim 5, wherein, The extension handle (5) and the gear shifting handle (12) have different moving directions.

7. The bicycle shifting mechanism of claim 4, wherein, The fixed sheet (10) is provided with a fixed foot (101).

8. The bicycle shifting mechanism of claim 1, wherein, The rotating disc (4) is provided with a concave cavity (42), the extension handle (5) is sleeved on the connecting shaft (1) and embedded in the concave cavity (42).

9. The bicycle shifting mechanism of claim 1, wherein, The rotating disc (4) is provided with a cover plate (43), the cover plate (43) is provided with a through hole (431), the shifting piece (41) is provided with a protruding part (411), the protruding part (411) extends from the through hole (431) and is limited by the through hole (431).

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