Mechanical control mechanism for derailleur and bicycle

Abstract

The application discloses a derailleur mechanical control mechanism and a bicycle with the same, which comprises a shell, a winding reel, a gear structure, a gear-in shifting rod, a gear-in pawl and a positioning pawl. The winding reel can wind a shifting line in a second rotating direction. The gear-in tooth set comprises an initial gear-in surface and a plurality of gear-in teeth. The positioning pawl set comprises an initial positioning surface and a plurality of positioning pawls. Whenever the winding reel rotates in the second rotating direction, the central angle of the circular arc formed between the initial positioning surface and the first positioning pawl or the tooth pitch angle of the adjacent two positioning pawls is consistent with the central angle of the circular arc formed between the gear-in pawl and the nearest gear-in tooth in the first rotating direction. The mechanism ingeniously designs the corresponding relationship between the gear-in tooth set and the positioning pawl set. Even when the tooth pitch angle is small, the gear-in pawl will not jump teeth when resetting. Even if the machining precision is insufficient, the gear-in pawl will not be stuck when resetting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycles, in particular to a mechanical control mechanism of a derailleur and a bicycle. BACKGROUND

[0002] The derailleur is widely used in bicycles, and its control mode can be divided into electronic control and mechanical control. The mechanical control is mainly hand control and finger control. The control core of the hand control or finger control in gear shifting mode is that the positioning ratchet on the positioning gear is constrained by the positioning pawl to prevent retreat, and the shifting ratchet on the shifting gear is shifted by the shifting pawl, so that the shifting gear, the positioning gear and the winding disc rotate at the same time. The winding disc rotates at least the tooth pitch angle of the adjacent two positioning ratchets on the positioning gear each time, and then the shift wire of the derailleur is wound and pulled to realize the chain shift on different freewheel pieces. Since the angle of rotation of the winding disc each time is determined by the specific distance required for the derailleur each time, the tooth pitch angles of any adjacent two positioning ratchets on the positioning gear are different.

[0003] At present, the tooth pitch angles of the first and second shifting ratchets on the shifting gear are designed to be equal to the tooth pitch angles of the first and second positioning ratchets on the positioning gear, and the tooth pitch angles of the N+1th and N+2th shifting ratchets are designed to be equal to the tooth pitch angles of the N+1th and N+2th positioning ratchets. In this way, when the tooth pitch angle is small, the shifting pawl is likely to skip teeth when it is reset, that is, the shifting pawl slides over at least one shifting tooth, so that the tooth pitch angles of the subsequent shifting gear and the positioning gear cannot be matched. If the machining precision is insufficient, the shifting pawl may also be stuck when it is reset, that is, the shifting pawl cannot smoothly slide over the next shifting tooth, affecting the subsequent shifting operation. The above two phenomena will affect the efficiency and accuracy of the speed change, and will make the shifting feel worse. It is extremely disadvantageous for the rider who needs to accurately control the riding speed. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a mechanical control mechanism of a derailleur, which can reduce the phenomenon of skipping teeth or sticking of the shifting pawl during the shifting operation.

[0005] The present application also provides a bicycle with the above-mentioned mechanical control mechanism of a derailleur.

[0006] The mechanical control mechanism of the chain shifter according to the first aspect of the present application has opposite first and second rotation directions, and comprises: a housing provided with a first pivot; a winding reel rotatably connected to the housing via the first pivot, the winding reel being capable of winding a shift wire in the second rotation direction, a first elastic return member being provided between the winding reel and the housing, the first elastic return member being configured to apply a torque to the winding reel in the first rotation direction; a gear structure fixedly installed on the winding reel, the gear structure being provided with a gear-in tooth set and a positioning ratchet set on the outer periphery thereof, the gear-in tooth set comprising an initial gear-in face and a plurality of gear-in teeth arranged in sequence and at intervals in the first rotation direction, the positioning ratchet set comprising an initial positioning face and a plurality of positioning ratchets arranged in sequence and at intervals in the first rotation direction, the tooth pitch angle of the first gear-in tooth and the second gear-in tooth being equal to the central angle of the circular arc formed between the initial positioning face and the first positioning ratchet, the tooth pitch angle of the N+1th gear-in tooth and the N+2th gear-in tooth being equal to the tooth pitch angle of the Nth positioning ratchet and the N+1th positioning ratchet, N being a positive integer; a gear-in lever rotatably connected to the housing via the first pivot, the gear-in lever being capable of being actuated to rotate in the second rotation direction; a gear-in pawl provided on the gear-in lever, the gear-in pawl being configured to be inserted between the initial gear-in face and the first gear-in tooth in an initial state, and the central angle of the circular arc formed between the gear-in pawl and the first gear-in tooth being smaller than the tooth pitch angle of any two adjacent gear-in teeth; a positioning pawl provided on the housing, the positioning pawl being configured to block the initial positioning face and capable of preventing the winding reel from rotating in the first rotation direction in the initial state; whenever the winding reel rotates in the second rotation direction by the central angle of the circular arc corresponding to the initial positioning face and the first positioning ratchet or the tooth pitch angle of any two adjacent positioning ratchets, the central angle of the circular arc formed between the gear-in pawl and the nearest gear-in tooth in the first rotation direction remains consistent.

[0007] The present application has at least the following beneficial effects: the present application ingeniously designs the corresponding relationship between the upshift gear set and the positioning ratchet set, the tooth pitch angle of the first upshift gear and the second upshift gear is designed to be equal to the central angle of the arc corresponding to the initial positioning surface and the first positioning ratchet, the tooth pitch angle of the N+1th upshift gear and the N+2th upshift gear is designed to be equal to the tooth pitch angle of the Nth positioning ratchet and the N+1th positioning ratchet, so that the central angle of the arc corresponding to the upshift pawl and the nearest upshift gear in the first rotation direction is consistent when the spool rotates the central angle of the arc corresponding to the initial positioning surface and the first positioning ratchet or the tooth pitch angle of the adjacent two positioning ratchets in the second rotation direction, and since the constant angle distance, even in the case of encountering a small tooth pitch angle, the upshift pawl will not jump when resetting, preventing the upshift pawl from sliding through the upshift gear, and since the central angle of the arc corresponding to the upshift pawl and the first upshift gear is smaller than the tooth pitch angle of any adjacent two upshift gears, the upshift pawl will not easily jam when resetting, smoothly sliding through the next upshift gear, by designing the central angle of the arc corresponding to the upshift pawl and the first upshift gear to be small, even if there is a lack of machining accuracy, the upshift pawl will not jam when resetting, thereby ensuring the consistency of the upshift pawl cutting into the upshift gear set each time during the upshift operation.

[0008] According to some embodiments of the present application, the maximum angle of the upshift lever actuated in the second rotation direction is greater than the tooth pitch angle of any adjacent two upshift gears.

[0009] According to some embodiments of the present application, at least part of the tooth pitch angles of any adjacent two upshift gears are not equal.

[0010] According to some embodiments of the present application, the tooth pitch angles of any adjacent two upshift gears are not equal.

[0011] According to some embodiments of the present application, the number of upshift gears is consistent with the number of positioning ratchets.

[0012] According to some embodiments of the present application, a second elastic return member is arranged between the shift lever and the housing, and is configured to apply a torque to the shift lever in the first rotation direction, when the shift lever is actuated in the initial position to rotate in the second rotation direction by a preset minimum shift angle, the shift pawl pushes the initial shift surface to rotate the winding disc in the second rotation direction, the positioning pawl slides through the first positioning ratchet and is inserted between the first and second positioning ratchets, when the shift lever is released and rotates in the first rotation direction back to the initial position under the action of the second elastic return member, the winding disc rotates in the first rotation direction under the action of the first elastic return member until the first positioning ratchet is blocked by the positioning pawl, and the shift pawl slides through the first shift tooth in the first rotation direction and is inserted between the first and second shift teeth.

[0013] According to some embodiments of the present application, the shift lever is provided with a second pivot, the shift pawl is pivotally connected to the shift lever through the second pivot, and a third elastic return member is arranged between the shift pawl and the shift lever, and is configured to apply an elastic force to the shift pawl towards the shift tooth group.

[0014] According to some embodiments of the present application, the housing is provided with a third pivot, the positioning pawl is pivotally connected to the housing through the third pivot, and a fourth elastic return member is arranged between the positioning pawl and the housing, and is configured to apply an elastic force to the positioning pawl towards the positioning ratchet group.

[0015] According to some embodiments of the present application, the gear structure comprises a shift gear and a positioning gear, the shift tooth group is arranged on the outer periphery of the shift gear, the positioning ratchet group is arranged on the outer periphery of the positioning gear, the winding disc is provided with a winding part capable of winding the shift wire in the second rotation direction, and the positioning gear is closer to the winding part than the shift gear.

[0016] The bicycle according to the second aspect of the present application comprises a handlebar and the mechanical control mechanism of the derailleur according to the first aspect of the present application, and the housing is arranged on the handlebar.

[0017] The present application has at least the following beneficial effects: the bicycle has all the beneficial effects of the mechanical control mechanism of the derailleur, which will not be repeated here.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0020] Figure 1 is a structural schematic diagram of an embodiment of the application;

[0021] Figure 2 is a structural schematic diagram of an embodiment of the application; Figure 1

[0022] Figure 3 is a structural schematic diagram of an embodiment of the application; Figure 2

[0023] Figure 4 is a structural schematic diagram of an embodiment of the application; Figure 3

[0024] Figure 5 is a schematic diagram of cooperation between the forward shifting lever and the forward shifting pawl in an embodiment of the application;

[0025] Figure 6 is a schematic diagram of cooperation between the winding disc and the gear structure in an embodiment of the application;

[0026] Figure 7 is a schematic diagram of an embodiment of the application in an initial state;

[0027] Figure 8 is a schematic diagram of an embodiment of the application when the first positioning ratchet is clamped by the positioning pawl.

[0028] The accompanying drawings are provided to further describe the application, and the specific embodiments are described below in conjunction with the accompanying drawings, in which: shell 1, first pivot 11, third pivot 12, winding disc 2, winding part 21, gear structure 3, forward shifting gear 3a, positioning gear 3b, forward shifting tooth set 31, initial forward shifting surface 311, forward shifting tooth 312, first forward shifting tooth 312a, second forward shifting tooth 312b, positioning ratchet set 32, initial positioning surface 321, positioning ratchet 322, first positioning ratchet 322a, second positioning ratchet 322b, forward shifting lever 4, second pivot 41, forward shifting pawl 5, positioning pawl 6, shifting wire 7, first elastic return member 8, second elastic return member 9, third elastic return member 10, fourth elastic return member 13, clamping ring 14. DETAILED DESCRIPTION

[0029] Embodiments of the application are described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation of the application.

[0030] ​​​In the description of the present application, it should be understood that the orientation description, such as the first rotation direction, the second rotation direction, clockwise, counterclockwise, and the like, indicates the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of the present application, if the first, second, Nth, N+1th, N+2th are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0032] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0033] Referring to Figures 1 to 8 , the present application discloses a mechanical control mechanism of a derailleur, having opposite first and second rotation directions, comprising a housing 1, a winding disc 2, a gear structure 3, a gear-in lever 4, a gear-in pawl 5 and a positioning pawl 6.

[0034] Referring to Figure 2 , the housing 1 is provided with a first pivot 11, and the winding disc 2 is rotatably connected to the housing 1 through the first pivot 11. The winding disc 2 can wind the shift wire 7 in the second rotation direction. It can be understood that the winding disc 2 winds and pulls the shift wire 7 of the derailleur in the second rotation direction, so that the chain is shifted on different freewheel segments, realizing the gear-in operation.

[0035] Among them, a first elastic return member 8 is arranged between the winding disc 2 and the housing 1. The first elastic return member 8 can be a coil spring, a torsion spring or other spring structure. The first elastic return member 8 is configured to apply a torque in the first rotation direction to the winding disc 2, so that the winding disc 2 has a tendency to rotate in the first rotation direction.

[0036] Referring to Figure 3 , Figure 4 and Figure 6 , the gear structure 3 is fixedly installed on the winding disc 2. The outer periphery of the gear structure 3 is provided with a gear-in tooth group 31 and a positioning ratchet group 32. The gear-in tooth group 31 includes an initial gear-in surface 311 and a plurality of gear-in teeth 312 arranged in sequence and spaced apart in the first rotation direction. The positioning ratchet group 32 includes an initial positioning surface 321 and a plurality of positioning ratchet teeth 322 arranged in sequence and spaced apart in the first rotation direction.

[0037] It should be noted that the initial shifting surface 311 and the initial positioning surface 321 are planar structures, which can be part of the tooth surface or non-tooth surface structure, wherein the initial shifting surface 311 can meet the condition that it will not be separated from the shifting pawl 5 and can drive the spool 2 to rotate with it when the shifting pawl 5 is abutted and pushed in the second rotation direction; the initial positioning surface 321 can block the positioning pawl 6 in the initial state, preventing the spool 2 from rotating in the first rotation direction.

[0038] In the corresponding relationship design of the shifting teeth group 31 and the positioning ratchet group 32, the tooth pitch angle of the first shifting tooth 312a and the second shifting tooth 312b is equal to the central angle of the circular arc corresponding to the initial positioning surface 321 and the first positioning ratchet 322a, and so on. The tooth pitch angle of the N+1th shifting tooth and the N+2th shifting tooth is equal to the tooth pitch angle of the Nth positioning ratchet and the N+1th positioning ratchet, where N is a positive integer. It can be understood that the tooth pitch angle refers to the central angle of the circular arc corresponding to the two teeth, specifically the central angle of the circular arc corresponding to the two teeth on the same side tooth profile, the central angle of the circular arc corresponding to the initial positioning surface 321 and the first positioning ratchet 322a, specifically the central angle of the circular arc corresponding to the side tooth surface of the first positioning ratchet 322a that can block the positioning pawl 6 and the initial positioning surface 321.

[0039] Since the minimum angle of rotation of the spool 2 required for each shifting is determined by the specific distance required for each shifting of the derailleur, in general, at least part of the tooth pitch angles of all adjacent two shifting teeth 312 are not equal, but if the derailleur is designed to have equal distance required for each shifting, then the tooth pitch angles of all adjacent two shifting teeth 312 can also be equal.

[0040] Referring to Figure 5 , the shifting lever 4 is rotationally connected to the housing 1 through the first pivot 11, the shifting lever 4 can be actuated to rotate in the second rotation direction, the shifting pawl 5 is arranged on the shifting lever 4, and the shifting pawl 5 is configured to be inserted between the initial shifting surface 311 and the first shifting tooth 312a in the initial state, and the central angle of the circular arc corresponding to the shifting pawl 5 and the first shifting tooth 312a is less than the tooth pitch angle of any adjacent two shifting teeth 312. It can be understood that the shifting pawl 5 as a pawl structure can slide through the shifting teeth 312 in the first rotation direction relative to the spool 2 when reset.

[0041] Referring to Figure 4The positioning pawl 6 is arranged on the housing 1 and is configured to clamp the initial positioning surface 321 and prevent the winding disc 2 from rotating in the first rotating direction in the initial state. It can be understood that the positioning pawl 6 is a pawl structure and can slide along the first rotating direction relative to the winding disc 2 when reset.

[0042] With reference to Figure 7 and Figure 8 , when the winding disc 2 rotates in the second rotating direction by an angle corresponding to the circular arc formed between the initial positioning surface 321 and the first positioning tooth 322a or the pitch angle of the adjacent two positioning teeth 322, the angle corresponding to the circular arc formed between the advancing pawl 5 and the advancing tooth 312 closest to the first rotating direction is consistent. It should be noted that the circular arc formed between the advancing pawl 5 and the advancing tooth 312 refers to the circular arc formed between the tooth root center line of the advancing tooth 312 and the tip of the advancing pawl 5.

[0043] For convenience of explanation, taking the first rotation of the winding disc 2 as an example, with reference to Figure 7 and Figure 8 , when the winding disc 2 rotates in the second rotating direction by an angle corresponding to the circular arc formed between the initial positioning surface 321 and the first positioning tooth 322a, since the pitch angle of the first advancing tooth 312a and the second advancing tooth 312b is equal to the angle corresponding to the circular arc formed between the initial positioning surface 321 and the first positioning tooth 322a, it is equivalent to that the winding disc 2 rotates in the second rotating direction by the pitch angle of the first advancing tooth 312a and the second advancing tooth 312b, if taking the housing 1 or the advancing pawl 5 as the reference, that is, the second advancing tooth 312b is in the position originally occupied by the first advancing tooth 312a, so, Figure 8 the angle corresponding to the circular arc formed between the advancing pawl 5 and the second advancing tooth 312b in Figure 7 is consistent with the angle corresponding to the circular arc formed between the advancing pawl 5 and the first advancing tooth 312a in

[0044] The mechanism ingeniously designs the corresponding relationship between the advancing tooth group 31 and the positioning tooth group 32. Since the advancing pawl 5 and the advancing tooth 312 closest to the first rotating direction always maintain a constant angular distance, even in the case of encountering a smaller pitch angle, the advancing pawl 5 will not jump teeth when reset, preventing the advancing pawl 5 from sliding too much through the advancing tooth 312.

[0045] Since the central angle of the circular arc formed between the upshift pawl 5 and the first upshift tooth 312a is smaller than the pitch angle of any two adjacent upshift teeth 312, the upshift pawl 5 is not likely to be stuck when returning, and can smoothly slide over the next upshift tooth 312. By designing the central angle of the circular arc formed between the upshift pawl 5 and the first upshift tooth 312a to be small, even if the machining precision is insufficient, the upshift pawl 5 will not be stuck when returning, thereby ensuring the consistency of the upshift pawl 5 cutting into the upshift tooth set 31 each time during the upshift operation.

[0046] To facilitate the upshift operation of the rider, the rider can push the spool 2 to rotate two or more pitch angles of the upshift teeth 312 at one time during the actuation of the upshift lever 4, thereby achieving single-stage or multi-stage upshift operation. In some embodiments, referring to Figures 6 to 8 To ensure that the rider can at least achieve single-stage upshift each time the upshift lever 4 is actuated, the maximum angle by which the upshift lever 4 can be actuated to rotate in the second rotation direction is greater than the pitch angle of any two adjacent upshift teeth 312.

[0047] In some embodiments, referring to Figure 6 At least some of the pitch angles of the adjacent two upshift teeth 312 are not equal, which is conducive to the design of the derailleur, so that the mechanism can be adapted to different combinations of freewheel pieces. In some embodiments, all the pitch angles of the adjacent two upshift teeth 312 are not equal. Referring to Figure 6 The number of upshift teeth 312 can be consistent with the number of positioning ratchets 322, forming a one-to-one correspondence.

[0048] Referring to Figure 1 , Figure 4 and Figure 5 In some embodiments, a second elastic return member 9 is provided between the upshift lever 4 and the housing 1. The second elastic return member 9 can be a torsion spring, a coil spring or other spring structure. The second elastic return member 9 is configured to apply a torque to the upshift lever 4 in the first rotation direction, so that the upshift lever 4 has a tendency to rotate in the first rotation direction. When the rider releases the actuation of the upshift lever 4, the upshift lever 4 can automatically return to the initial position, so that the rider can perform the next upshift operation.

[0049] The initial position is as shown in Figure 7As shown, when the shift lever 4 is actuated in the initial position to rotate in the second rotation direction by a preset minimum shift angle, the shift pawl 5 pushes the initial shift surface 311 to rotate the spool 2 in the second rotation direction, the positioning pawl 6 slides through the first positioning ratchet tooth 322a and is inserted between the first positioning ratchet tooth 322a and the second positioning ratchet tooth 322b, and when the shift lever 4 is released and rotated in the first rotation direction back to the initial position under the action of the second elastic return member 9, the spool 2 is rotated in the first rotation direction under the action of the first elastic return member 8 until the first positioning ratchet tooth 322a is blocked by the positioning pawl 6, as shown. Figure 8 As shown, the shift pawl 5 slides through the first shift tooth 312a in the first rotation direction and is inserted between the first shift tooth 312a and the second shift tooth 312b. It can be understood that the preset minimum shift angle refers to a single-stage shift angle.

[0050] Referring to Figure 4 and Figure 5 In some embodiments, the shift lever 4 is provided with a second pivot 41, the shift pawl 5 is rotatably connected to the shift lever 4 through the second pivot 41, and a third elastic return member 10 is arranged between the shift pawl 5 and the shift lever 4. The third elastic return member 10 can be a torsion spring, a compression spring, a tension spring or other spring structure, and is configured to apply a spring force to the shift pawl 5 in the direction of the shift tooth set 31. Not only can it ensure that the shift pawl 5 does not jump out of the shift tooth set 31 when pushing the initial shift surface 311 or the shift tooth 312, but also can ensure that the shift lever 4 is always pressed on the shift tooth set 31 when resetting in the first rotation direction, and can smoothly slide through the shift tooth 312.

[0051] In some embodiments, referring to Figure 2 and Figure 3 The housing 1 is provided with a third pivot 12, the positioning pawl 6 is rotatably connected to the housing 1 through the third pivot 12, and a fourth elastic return member 13 is arranged between the positioning pawl 6 and the housing 1. The fourth elastic return member 13 can be a torsion spring, a compression spring, a tension spring or other spring structure, and is configured to apply a spring force to the positioning pawl 6 in the direction of the positioning ratchet tooth set 32. Not only can it ensure that the positioning pawl 6 does not jump out of the positioning ratchet tooth set 32 when being blocked by the initial positioning surface 321 or the positioning ratchet tooth 322, but also can ensure that the positioning ratchet tooth 322 smoothly slides through the positioning pawl 6 in the second rotation direction.

[0052] The gear structure 3 can be a single gear structure, and a part of the outer periphery of the single gear structure is the upshift gear set 31, and a part is the positioning ratchet set 32. In some embodiments, the gear structure 3 can also be a double gear structure, including an upshift gear 3a and a positioning gear 3b. The upshift gear set 31 is arranged on the outer periphery of the upshift gear 3a, and the positioning ratchet set 32 is arranged on the outer periphery of the positioning gear 3b. The winding drum 2 is provided with a winding part 21, which can wind the shift wire 7 in the second rotation direction. The positioning gear 3b is closer to the winding part 21 than the upshift gear 3a.

[0053] The application also discloses a bicycle comprising a handlebar and the mechanical control mechanism of the derailleur, and the housing 1 is arranged on the handlebar. The bicycle has all the beneficial effects of the mechanical control mechanism of the derailleur, which will not be repeated here.

[0054] In some embodiments, referring to Figure 1 The housing 1 is provided with a clamping ring 14, which can be mounted on the handlebar.

[0055] The technical features of the above-mentioned embodiments can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0056] Of course, the application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A mechanical control mechanism for a derailleur, characterised in that, Having opposite first and second rotation directions, comprising: a housing provided with a first pivot; a winding drum rotatably connected to the housing via the first pivot, the winding drum being capable of winding a shift wire in the second rotation direction, a first elastic return member being provided between the winding drum and the housing, the first elastic return member being configured to apply a torque to the winding drum in the first rotation direction; a gear structure fixedly installed on the winding drum, an outer periphery of the gear structure being provided with a gear-in tooth group and a positioning ratchet group, the gear-in tooth group comprising an initial gear-in face and a plurality of gear-in teeth arranged in sequence and at intervals in the first rotation direction, the positioning ratchet group comprising an initial positioning face and a plurality of positioning ratchets arranged in sequence and at intervals in the first rotation direction, a tooth pitch angle of a first gear-in tooth and a second gear-in tooth being equal to a central angle of a circular arc formed between the initial positioning face and the first positioning ratchet, a tooth pitch angle of an N+1th gear-in tooth and an N+2th gear-in tooth being equal to a tooth pitch angle of an Nth positioning ratchet and an N+1th positioning ratchet, N being a positive integer, at least part of tooth pitch angles of all adjacent two gear-in teeth being unequal; a gear-in lever rotatably connected to the housing via the first pivot, the gear-in lever being capable of being actuated to rotate in the second rotation direction; a gear-in pawl provided on the gear-in lever, the gear-in pawl being configured to be inserted between the initial gear-in face and the first gear-in tooth in an initial state, and a central angle of a circular arc formed between the gear-in pawl and the first gear-in tooth being smaller than a tooth pitch angle of any adjacent two gear-in teeth; a positioning pawl provided on the housing, the positioning pawl being configured to block the initial positioning face and capable of preventing the winding drum from rotating in the first rotation direction in the initial state; whenever the winding drum rotates by a central angle of a circular arc formed between the initial positioning face and the first positioning ratchet or a tooth pitch angle of adjacent two positioning ratchets in the second rotation direction, a central angle of a circular arc formed between the gear-in pawl and the nearest gear-in tooth in the first rotation direction remains consistent.

2. The derailleur mechanical control mechanism according to claim 1, characterized in that, A maximum angle by which the gear-in lever is capable of being actuated to rotate in the second rotation direction is greater than a tooth pitch angle of any adjacent two gear-in teeth.

3. The derailleur mechanical control mechanism according to claim 1, characterized in that, Tooth pitch angles of all adjacent two gear-in teeth are unequal.

4. The derailleur mechanical control mechanism of claim 1, wherein, The number of gear-in teeth is consistent with the number of positioning ratchets.

5. The mechanical control mechanism for a derailleur according to any one of claims 1 to 4, characterized in that, The second elastic reset member is arranged between the shift lever and the housing, and is configured to apply a torque to the shift lever in a first rotation direction. When the shift lever is actuated in the initial position to rotate in a second rotation direction by a preset minimum shift angle, the shift pawl pushes the initial shift surface to rotate the winding disc in the second rotation direction, the positioning pawl slides through the first positioning ratchet and is inserted between the first positioning ratchet and the second positioning ratchet. When the shift lever is de-actuated and rotates in the first rotation direction back to the initial position under the action of the second elastic reset member, the winding disc rotates in the first rotation direction under the action of the first elastic reset member until the first positioning ratchet is blocked by the positioning pawl. The shift pawl slides through the first shift tooth in the first rotation direction and is inserted between the first shift tooth and the second shift tooth.

6. The mechanical control mechanism of the derailleur according to claim 5, characterized in that, The shift lever is provided with a second pivot, and the shift pawl is pivotally connected to the shift lever through the second pivot. A third elastic reset member is arranged between the shift pawl and the shift lever, and is configured to apply an elastic force to the shift pawl towards the shift tooth group.

7. The derailleur mechanical control mechanism of claim 1, wherein, The housing is provided with a third pivot, and the positioning pawl is pivotally connected to the housing through the third pivot. A fourth elastic reset member is arranged between the positioning pawl and the housing, and is configured to apply an elastic force to the positioning pawl towards the positioning ratchet group.

8. The derailleur mechanical control mechanism of claim 1, wherein, The gear structure includes a shift gear and a positioning gear. The shift tooth group is arranged on the outer periphery of the shift gear, and the positioning ratchet group is arranged on the outer periphery of the positioning gear. The winding disc is provided with a winding part capable of winding the shift wire in the second rotation direction. The positioning gear is closer to the winding part than the shift gear.

9. Bicycle, characterized in that The derailleur mechanical control mechanism includes a handlebar, and the housing is arranged on the handlebar.

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