A shift structure, a transmission system and a bicycle

Abstract

The application relates to the technical field of transmission devices, and particularly discloses a gear shifting structure, a gear shifting system and a bicycle, which comprises a hollow transmission shaft, a plurality of clutch transmission assemblies, a gear shifting rod and a driving assembly; the plurality of clutch transmission assemblies are installed on the transmission shaft and are distributed along the length direction of the transmission shaft; the gear shifting rod is installed in the transmission shaft and can move along the length direction of the transmission shaft; the gear shifting rod is provided with a gear shifting part which can be connected with the clutch transmission assembly; the clutch transmission assembly has a retracted state and a use state; the driving assembly is used for driving the gear shifting rod to move, so that the gear shifting part on the gear shifting rod can be connected with any one of the clutch transmission assemblies; when the gear shifting part is connected with the clutch transmission assembly, the clutch transmission assembly is in the use state; and when the gear shifting part is disconnected from the clutch transmission assembly, the clutch transmission assembly is in the retracted state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission devices, in particular to a gear shifting structure, a gear shifting system and a bicycle. BACKGROUND

[0002] The gear shifting mode of a bicycle generally includes chain gear shifting and axle shifting, and the axle shifting of an existing bicycle is generally achieved by providing a gear shifting box at the axle pedal, wherein the gear shifting box is provided with a gear shifting structure for facilitating user control, and the gear shifting structure is used to control the different meshing of a planetary gear set to achieve gear shifting. However, the gear shifting structure of the existing gear shifting box is complex in structure and occupies a large installation space, which leads to a large volume and weight of the gear shifting box as a whole, and is not conducive to the miniaturization and light weight of the gear shifting box. SUMMARY

[0003] In view of the above, the present application provides a gear shifting structure for solving the technical problems in the background art.

[0004] To achieve one or part or all of the above purposes or other purposes, the present application provides a gear shifting structure, comprising: a transmission shaft which is at least partially hollow, a plurality of clutch transmission assemblies, a gear shifting lever and a driving assembly.

[0005] The plurality of clutch transmission assemblies are installed on the transmission shaft and are spaced apart along the length direction of the transmission shaft.

[0006] The gear shifting lever is installed in the transmission shaft and is movable along the length direction of the transmission shaft, and the gear shifting lever is provided with a gear shifting part which is connectable with the clutch transmission assemblies.

[0007] The clutch transmission assemblies have a retracted state and a use state, and the driving assembly is used to move the gear shifting lever so that the gear shifting part on the gear shifting lever is connectable with any one of the clutch transmission assemblies. When the gear shifting part is connected with the clutch transmission assembly, the clutch transmission assembly is in the use state, and when the gear shifting part is disconnected from the clutch transmission assembly, the clutch transmission assembly is in the retracted state.

[0008] Preferably, the driving assembly comprises a slide rod, a connecting seat, a connecting rod and a first oil cylinder.

[0009] The connecting seat has a through hole which is not smaller than the diameter of the transmission shaft and not larger than the length of the slide rod, the side wall of the through hole has an annular groove which can accommodate the slide rod, and the bottom of the annular groove has a limiting hole which is connected to the outside of the connecting seat.

[0010] The power shaft has a pair of guide holes, one end of the connecting rod is sealingly and slidingly connected with the first oil cylinder, and the other end is connected with one side of the connecting seat; the connecting seat is sleeved on the transmission shaft, the slide rod is inserted into the connecting seat through the limiting hole, connected with the shift lever through one guide hole, and connected with the transmission shaft through the other guide hole, and both ends of the slide rod are located in the annular groove and can rotate with the transmission shaft in the annular groove, and the first oil cylinder can drive the connecting seat to move along the axial direction of the transmission shaft through the connecting rod.

[0011] Preferably, the shift part is a radially convexly extended shift boss, and both ends of the shift boss are provided with inclined transition surfaces.

[0012] Preferably, the clutch transmission assembly comprises a pawl and a spring, and the transmission shaft is provided with a mounting hole for mounting the pawl.

[0013] The pawl is assembled into the mounting hole through the spring, the pawl has a transmission part inside the transmission shaft and a clamping part outside the transmission shaft; the transmission part is used for abutting against the shift boss, when the clutch transmission assembly is in a use state, the transmission part is abutted by the shift boss, the clamping part is outside the mounting hole, when the clutch transmission assembly is in a retracted state, the transmission part is not abutted by the shift boss, and the clamping part is retracted into the mounting hole under the action of the spring.

[0014] Preferably, the inner wall of the mounting hole is provided with a jack, the side wall of the pawl away from the transmission part is provided with a limiting groove, one end of the spring is bent and folded to form a fixed end, the fixed end of the spring is inserted into the jack, the other end of the spring is embedded in the limiting groove, and the spring is arranged in abutment with the bottom wall of the limiting groove.

[0015] Preferably, the driving assembly comprises a second oil cylinder, the second oil cylinder is coaxially arranged with the transmission shaft, and one end of the shift lever is sealingly and slidingly connected with the second oil cylinder.

[0016] Preferably, the driving assembly comprises a motor, the inner wall of the transmission shaft is provided with a transmission screw hole, the outer wall of the shift lever is provided with a lever wall screw thread connected with the transmission screw hole, and the shift lever is further provided with a coaxial special-shaped hole.

[0017] The motor is fixed in the interior of the transmission shaft, and the output shaft of the motor is keyed connected with the special-shaped hole.

[0018] A shift system comprises the shift structure, the housing, and a plurality of primary driving wheels arranged on the transmission shaft.

[0019] The transmission shaft is rotatably connected with the housing.

[0020] The gear shifting structure can make the clutch transmission assembly in a use state, and the clutch transmission assembly can make any one of the multi-stage driving wheel groups and the transmission shaft in transmission connection.

[0021] The gear shifting lever and the connecting rod are spaced apart from each other by a distance that is less than or greater than the maximum inner diameter of the multi-stage driving wheel groups, and the first oil cylinder is fixed to the housing.

[0022] A gear shifting system includes the gear shifting structure, the housing, and the multi-stage driven wheel groups mounted on the transmission shaft.

[0023] The transmission shaft is rotatably connected to the housing, one end of the transmission shaft is an output end, the second oil cylinders are distributed on the end of the transmission shaft away from the output end, and the second oil cylinders are fixed to the housing.

[0024] The gear shifting structure can make the clutch transmission assembly in a use state, and the clutch transmission assembly can make any one of the multi-stage driven wheel groups and the transmission shaft in transmission connection.

[0025] A bicycle includes the gear shifting system.

[0026] The embodiments of the present application have the following beneficial effects:

[0027] After the above scheme is adopted, the gear shifting structure sets the gear shifting lever inside the transmission shaft, so that the gear shifting lever does not need an additional assembly position, thereby reducing the overall volume of the gear shifting structure, making the gear shifting structure occupy less space when applied to a gear shifting system such as a gear box, and facilitating the miniaturization and light weight of the gear box. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0029] Among them:

[0030] Figure 1 It is a schematic diagram of the overall structure in the embodiment;

[0031] Figure 2 It is an exploded view of the overall structure in the embodiment;

[0032] Figure 3 It is an orthographic projection view of the overall structure in the embodiment;

[0033] Figure 4 It is Figure 3A-A sectional view of the embodiment;

[0034] Figure 5 B-B sectional view of the embodiment; Figure 3

[0035] Figure 6 Structure schematic diagram of the transmission shaft in the embodiment;

[0036] Figure 7 Structure schematic diagram of the pawl in the embodiment;

[0037] Figure 8 Assembly schematic diagram of the driving assembly and the shift lever in the embodiment;

[0038] Figure 9 Structure schematic diagram of the connecting seat in the embodiment;

[0039] Figure 10 Assembly schematic diagram of the driving assembly including the second oil cylinder in the embodiment;

[0040] Figure 11 B-B sectional view of the embodiment; Figure 10

[0041] Figure 12 Sectional view of the shift structure in the embodiment; Figure 10

[0042] Figure 13 Assembly schematic diagram of the driving assembly including the motor in the embodiment;

[0043] Figure 14 Sectional view of the driving assembly including the motor in the embodiment;

[0044] Figure 15 Schematic diagram of the shift structure in the embodiment applied to the transmission system; Figure 1

[0045] Figure 16 Schematic diagram of the shift structure in the embodiment; Figure 15

[0046] Schematic diagram of the shift structure in the embodiment applied to the transmission system. Figure 17 Figure 2

[0047] Reference signs:

[0048] 1, transmission shaft; 10, guide hole; 11, mounting hole; 110, insertion hole; 12, transmission threaded hole;

[0049] 2, clutch transmission assembly; 20, pawl; 200, clamping part; 201, transmission part; 202, limiting groove; 21, elastic sheet;

[0050] ​​​​​​3, shift lever; 30, shift part; 300, inclined transition surface; 31, lever wall thread; 32, special-shaped hole;

[0051] 4, drive assembly; 40, connecting seat; 400, through hole; 401, annular groove; 402, limiting hole; 41, sliding rod; 42, connecting rod; 43, first oil cylinder; 44, plugging element; 45, motor; 450, output shaft; 46, battery; 47, control board; 48, second oil cylinder

[0052] 5, housing;

[0053] 6, multi-stage driving wheel set;

[0054] 7, multi-stage driven wheel set;

[0055] 8, output shaft; 80, output end. DETAILED DESCRIPTION

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting upon the application; the description and claims of the application and the above-mentioned accompanying drawings are intended to cover all alternatives, modifications and equivalents of the means for carrying out the application falling within the scope of the application; the terms "comprising", "having", "including" and "containing" and any variations thereof in the description and in the claims herein are intended to cover both the inclusive and exclusive aspects of the terms; the terms "first", "second", and the like in the description and in the claims herein are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

[0057] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are merely examples from a whole class of comparable embodiments which those skilled in the art will readily appreciate. It is further understood that the descriptions and specific examples, while indicating preferred embodiments of the application, are intended to be only exemplary and are not intended to suggest any limitation on the scope of the application.

[0058] In order to make the technical personnel in the art better understand the application scheme, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings.

[0059] As shown in the accompanying drawings Figures 1-9As shown, the embodiment of the present application provides a shift structure, which comprises a hollow transmission shaft 1, a plurality of clutch transmission assemblies 2, a shift lever 3 and a driving assembly 4. The plurality of clutch transmission assemblies 2 are installed on the transmission shaft 1 and are spaced along the length direction of the transmission shaft 1. The shift lever 3 is installed in the transmission shaft 1 and is movable along the length direction of the transmission shaft 1. The clutch transmission assembly 2 has a retracted state and a use state. The shift lever 3 is provided with a shift part 30 connectable with the clutch transmission assembly 2. The driving assembly 4 is used to drive the shift lever 3 to move, so that the shift part 30 on the shift lever 3 is connectable with any one of the clutch transmission assemblies 2. When the shift part 30 is connected with the clutch transmission assembly 2, the clutch transmission assembly 2 is in the use state. When the shift part 30 is disconnected from the clutch transmission assembly 2, the clutch transmission assembly 2 is in the retracted state.

[0060] Specifically, the shift structure can be applied in a gearbox with a plurality of gear sets. The transmission shaft 1 is rotatably installed on a gearbox housing 5 and is used to install the plurality of gear sets. Through the plurality of clutch transmission assemblies 2 corresponding to each gear set of the plurality of gear sets, i.e. through the movement of the shift lever 3, the corresponding clutch transmission assembly 2 is in the use state, so that the corresponding gear is connected with the transmission shaft 1, and the gear rotates with the transmission shaft 1. In this embodiment, the shift lever 3 is arranged inside the transmission shaft 1, so that the shift lever 3 does not need an additional installation position, thereby reducing the overall volume of the shift structure, so that the shift structure occupies less space when applied in a gearbox or other variable speed system, which is beneficial to miniaturization and light weight of the gearbox. The spacing of the plurality of clutch transmission assemblies 2 in this embodiment is the same, which is convenient for adapting to the plurality of gear sets and for controlling the movement distance of the shift lever 3 by the driving assembly 4.

[0061] It should be further noted that the driving assembly 4 can adopt a built-in motor driving mode, such as Figure 13 and Figure 14As shown, the driving assembly includes a motor 45, a battery 46 and a control board 47, and specifically, a transmission screw hole 12 is arranged on the inner wall of the transmission shaft 1, a rod wall screw 31 connected with the transmission screw hole 12 is arranged on the outer wall of the shift lever 3, and the shift lever 3 is further provided with a coaxial special-shaped hole 32; the motor 45 is fixed in the interior of the transmission shaft 1, and the output shaft 450 of the motor 45 is keyed connected with the special-shaped hole 32, wherein the cross section of the output shaft 450 of the motor 45 and the cross section of the special-shaped hole 32 are both hexagonal, and through the key connection of the two, the output shaft 450 of the motor 45 can drive the shift lever 3 to rotate when the output shaft 450 rotates, and since the shift lever 3 is threadedly connected with the transmission shaft 1, the rotation of the shift lever 3 is converted into axial movement, so that the shift part 30 can be switched between different clutch transmission assemblies 2, and the forward rotation and reverse rotation of the motor 45 can also make the shift lever 3 move along the axial direction of the transmission shaft 1, so as to make the shift part 30 connect different clutch transmission assemblies 2; in addition, the motor 45, the battery 46 and the control board 47 are distributed from inside to outside in the interior of the transmission shaft 1, and the control board 47 at the outermost end is conducive to signal transmission and facilitates the user to control the motor 45.

[0062] Referring to the accompanying drawings Figure 2 and the accompanying drawings Figure 8 , the driving assembly 4 can adopt an external driving mode of an oil cylinder, and the driving assembly 4 includes a sliding rod 41, a connecting seat 40, a connecting rod 42 and a first oil cylinder 43; the connecting seat 40 has a through hole 400 not smaller than the diameter of the transmission shaft 1 and not larger than the length of the sliding rod 41, the side wall of the through hole 400 has an annular groove 401 capable of accommodating the sliding rod 41, and the bottom of the annular groove 401 has a limiting hole 402 communicated to the outside of the connecting seat 40; the power shaft has a pair of guide holes 10, one end of the connecting rod 42 is connected with the first oil cylinder 43, and the other end is connected with the connecting seat 40; the connecting seat 40 is sleeved on the transmission shaft 1, the sliding rod 41 is inserted into the connecting seat 40 through the limiting hole 402 and passes through one guide hole 10 to connect the shift lever 3 and then passes through the other guide hole 10, and both ends of the sliding rod 41 are located in the annular groove 401 and can rotate with the transmission shaft 1 in the annular groove 401, and the first oil cylinder can drive the connecting seat 40 to move along the axial direction of the transmission shaft 1 through the connecting rod 42.

[0063] Specifically, the body of the connecting seat 40 is provided with a through hole 400, through which the connecting seat 40 can be sleeved on the transmission shaft 1. The inner wall of the through hole 400 is provided with an annular groove 401, so that the two ends of the sliding rod 41 can be inserted into the annular groove 401, and the sliding rod 41 is arranged through the axis of the through hole 400. The sliding rod 41 can rotate in the circumferential direction of the through hole 400 under the action of force. This way makes the body of the connecting seat 40 not rotate when the transmission shaft 1 rotates and drives the sliding rod 41 to rotate after the sliding rod 41 is assembled on the transmission shaft 1, avoiding the position change of the connecting rod 42 and the first oil cylinder fixedly connected to the connecting seat 40, and ensuring the stable assembly of the first oil cylinder and the external parts. In order to realize the axial movement driving effect of the connecting seat 40 on the shift lever 3, an axially extending guide hole 10 is arranged on the transmission shaft 1. The guide hole 10 is a waist-shaped hole structure. When the connecting rod 42 drives the connecting seat 40 to move axially under the action of the first oil cylinder, the connecting seat 40 is internally assembled with the sliding rod 41, and the sliding rod 41 is limited by the guide hole 10, so that the connecting seat 40 can only move in the axial direction of the transmission shaft 1, thereby driving the shift lever 3 to move axially. In actual installation, one end of the sliding rod 41 is inserted into the connecting seat 40 through a limiting hole 402, then penetrates the shift lever 3 radially after passing through a guide hole 10, and finally is inserted into the annular groove 401 after passing through another guide hole 10. At this time, the other end of the sliding rod 41 is also arranged in the annular groove 401. The sliding rod 41 and the shift lever 3 can be threadedly connected, which is convenient for positioning and is also conducive to improving the connection stability between the sliding rod 41 and the shift lever 3, ensuring that the axial movement of the connecting seat 40 can stably drive the shift lever 3 to move axially, so that the shift part 30 is connected to the corresponding clutch transmission assembly 2. It should be noted that the connecting seat 40 is also provided with an outer extension part, and the outer extension part is provided with a hole for assembling the connecting rod 42. After the connecting rod 42 is connected to the outer extension part of the connecting seat 40, the connecting rod 42 and the transmission shaft 1 are in parallel relationship, that is, the first oil cylinder can further drive the connecting seat 40 to move by pushing the axial movement of the connecting rod 42. The extension length of the outer extension part directly determines the distance between the connecting rod 42 and the shift lever 3. In actual application, the distance between the connecting rod 42 and the shift lever 3 can be changed according to the length of the outer extension part, so that the shift structure can be applied in different sizes of gearboxes to adapt to different specifications of multi-stage gear sets.

[0064] In order to avoid the disconnection of the slide rod 41 from the connecting seat 40 during use, the driving assembly 4 further comprises a blocking piece 44, which is installed in the limiting hole 402 and is used to limit the axial movement of the slide rod 41. Specifically, the blocking piece 44 can be a stud, and the limiting hole 402 is a threaded hole. After the slide rod 41 is completely inserted into the connecting seat 40 through the limiting hole 402, the blocking piece 44 is screwed into the limiting hole 402. After the blocking piece 44 is assembled in the limiting hole 402, the end of the blocking piece 44 does not extend into the annular groove 401, avoiding the interference of the blocking piece 44 with the rotation of the slide rod 41.

[0065] In the present embodiment, the first oil cylinder 43 is provided with an oil cavity for the axial movement of the connecting rod 42. In actual application, the first oil cylinder 43 can be fixed at various positions of the transmission case according to assembly requirements.

[0066] The driving assembly 4 can also adopt an oil cylinder built-in driving mode. As shown in Figure 10 , Figure 11 and Figure 12 , the driving assembly 4 comprises a second oil cylinder 48, which is coaxially arranged with the transmission shaft 1. One end of the shift lever 3 is sealingly and slidingly connected to the second oil cylinder 48. Specifically, the end of the shift lever 3 away from the shift portion 30 is formed with a structure connected to the oil cavity of the second oil cylinder 48. The axial movement of the shift lever 3 inside the transmission shaft 1 is directly driven by the second oil cylinder 48, so as to realize the switching of the shift portion 30 between different clutch transmission assemblies 2. It should be noted that this mode is mainly used when the transmission shaft 1 serves as the output shaft of the transmission case. In actual application, the second oil cylinder 48 is directly fixed on the case of the transmission case, and the part of the second oil cylinder 48 used to connect the oil cavity of the shift lever 3 is inserted into the interior of the transmission shaft 1, so as to ensure the stable supply of the oil of the second oil cylinder 48 and the driving of the shift lever 3. The specific conditions of the application of this mode to the transmission case are given in subsequent embodiments.

[0067] As shown in Figure 4 and Figure 5As shown, the shift part 30 is a radial convex extension shift boss, both ends of the shift boss are provided with inclined transition surfaces 300, which make the shift lever 3 more smooth when switching different clutch transmission assemblies 2 in axial movement, the shift boss of the embodiment is controlled in abutting mode to control the clutch transmission assembly 2 in the use state or the retracted state, based on this, the clutch transmission assembly 2 is provided as a springy pawl 20 structure, and a ratchet structure can be provided on the corresponding gear, the clutch transmission assembly 2 is controlled in the use state by the shift boss, that is, the pawl structure of the clutch transmission assembly 2 is clamped with the ratchet mechanism on the corresponding gear, so as to establish the transmission relationship between the corresponding gear and the transmission shaft 1, on the contrary, the clutch transmission assembly 2 is in the retracted state, that is, the pawl structure is away from the ratchet mechanism on the corresponding gear, the structure composition of the clutch transmission assembly 2 will be further described later:

[0068] In the embodiment, the clutch transmission assembly 2 specifically includes: a pawl 20 and a spring piece 21, the transmission shaft 1 is provided with a mounting hole 11 for mounting the pawl 20; the pawl 20 is assembled into the mounting hole 11 through the spring piece 21, the pawl 20 has a transmission part 201 inside the transmission shaft 1 and a clamping part 200 outside the transmission shaft 1; the transmission part 201 is used for abutting against the shift boss, when the clutch transmission assembly 2 is in the use state, the transmission part 201 is abutted by the shift boss, the clamping part 200 is outside the mounting hole 11, when the clutch transmission assembly 2 is in the retracted state, the transmission part 201 is not abutted by the shift boss, and the clamping part 200 is retracted into the mounting hole 11 under the action of the spring piece 21. Specifically, an insertion hole 110 is arranged on the inner wall of the mounting hole 11, a limiting groove 202 is arranged on the side wall of the pawl 20 away from the transmission part 201, one end of the spring piece 21 is bent and folded to form a fixed end, the fixed end of the spring piece 21 is inserted into the insertion hole 110, the other end of the spring piece 21 is embedded in the limiting groove 202, and the spring piece 21 is arranged on the bottom wall of the limiting groove 202, the pawl 20 is assembled in the mounting hole 11 through the spring piece 21, the stability of the pawl 20 in the mounting hole 11 is improved, when the transmission part 201 is not abutted by the shift boss, the pawl 20 can be retracted into the mounting hole 11 when the ratchet connected with the pawl 20 is reversely rotated, connection is avoided when connection is not needed, on the contrary, Figure 4 As shown, when the transmission shaft 1 needs to rotate and drive the corresponding ratchet to rotate, the shift boss abuts against the transmission part 201, the clamping part 200 of the pawl 20 is outside the mounting hole 11, and the pawl 20 is limited by the shift boss and cannot be retracted, at this time, the ratchet can be driven to rotate, the above-mentioned ratchet can be integrally formed on the assembled multi-stage gear set, or can be fixed on the multi-stage gear set in the form of additional installation, and the multi-stage gear set is a transmission gear of the shift structure applied to the gearbox.

[0069] Referring to the drawings Figure 15 and the drawingsFigure 16 The embodiment also provides a variable speed system, which comprises the shift structure, the housing 5, and the multi-stage driving wheel set 6 installed on the transmission shaft 1.

[0070] The transmission shaft 1 is rotatably connected to the housing 5; the shift structure can make the clutch transmission assembly 2 in a use state, and the clutch transmission assembly 2 can make any stage of the multi-stage driving wheel set 6 in transmission connection with the transmission shaft 1; the distance between the shift lever 3 and the connecting rod 42 is less than the maximum inner diameter of the multi-stage driving wheel set 6, and the first oil cylinder 43 is fixed on the housing 5.

[0071] Specifically, the multi-stage driving wheel set 6 of the variable speed system has a large outer diameter, and the internal space of the housing is small. In order to avoid the external assembly of the first oil cylinder 43 from further increasing the volume of the housing 5, the distance between the shift lever 3 and the connecting rod 42 is set to be less than the maximum inner diameter of the multi-stage driving wheel set 6 in the embodiment, specifically, a containing groove is formed on the gear with the maximum diameter of the multi-stage driving wheel set 6, the connecting seat 40 is distributed in the containing groove, the first oil cylinder 43 is directly fixed on the housing 5, and the length of the connecting rod 42 is correspondingly reduced.

[0072] Referring to FIG. 1, Figure 8 , FIG. 2, Figure 17 The embodiment also provides a variable speed system, which comprises the shift structure, the housing 5, and the multi-stage driving wheel set 6 installed on the transmission shaft 1.

[0073] The transmission shaft 1 is rotatably connected to the housing 5; the shift structure can make the clutch transmission assembly 2 in a use state, and the clutch transmission assembly 2 can make any stage of the multi-stage driving wheel set 6 in transmission connection with the transmission shaft 1; the distance between the shift lever 3 and the connecting rod 42 is less than the maximum inner diameter of the multi-stage driving wheel set 6, and the first oil cylinder 43 is fixed on the housing 5. Different from the above variable speed system, the multi-stage driving wheel set 6 of the variable speed system has a small outer diameter, and the housing 5 still has a surplus space for use. In this case, the distance between the shift lever 3 and the connecting rod 42 is greater than the maximum inner diameter of the multi-stage driving wheel set 6 in the embodiment, so that the connecting rod 42 moves axially outside the multi-stage driving wheel set 6 without affecting the rotation of the multi-stage driving wheel set 6. At this time, the first oil cylinder 43 can be arranged on any side of the housing 5 according to actual requirements, so as to facilitate the connection of the external oil pipe. It should be noted that the variable speed system also has an output shaft 8 and a multi-stage driven wheel set 7 installed on the output shaft 8, wherein the output shaft 8 adopts a structure as shown in FIG. 3. Figure 8The oil cylinder built-in type transmission shaft 1 is replaced by an output shaft 8 for convenience of description and distinction. The output shaft 8 is rotatably connected to the housing 5, and the output shaft 8 is provided with a rotatable output end 80 extending out of the housing 5 and driven by the multi-stage driven gear set 7. Correspondingly, since the second oil cylinder 48 needs to be continuously supplied with oil, no rotation is generated. In this embodiment, the second oil cylinder 48 is fixed to the housing 5, and the oil chamber for driving the shift lever 3 is inserted into the interior of the output shaft 8. Another shift lever 3 arranged in the output shaft 8 is used to realize the switching of the plurality of clutch transmission assemblies 2 on the shaft by moving, so that any one stage gear of the multi-stage driven gear set 7 is in driving connection with the output shaft 8.

[0074] It should be further noted that the above-mentioned transmission system can also adopt a motor built-in driving assembly 4, or a combination of an oil cylinder external driving mode, an oil cylinder built-in driving mode and other modes, which can be selected according to the needs in actual production.

[0075] In other embodiments, a bicycle is also provided, which includes any one of the above-mentioned transmission systems.

[0076] Obviously, the above-described embodiments are only some of the embodiments of the present application, but not all the embodiments. The preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A gear shifting structure, characterized in that, include: At least partially hollow drive shaft, multiple clutch transmission assemblies, shift lever and drive assembly; Multiple sets of the clutch transmission assemblies are mounted on the transmission shaft, and the multiple sets of the clutch transmission assemblies are spaced apart along the length of the transmission shaft; The shift lever is installed inside the drive shaft and can move along the length of the drive shaft; the shift lever is provided with a shifting part that can be connected to the clutch transmission assembly; The clutch transmission assembly has a retracted state and a working state. The drive assembly is used to drive the shift lever to move, so that the shift part on the shift lever can be connected to any set of clutch transmission assemblies. When the shift part is connected to the clutch transmission assembly, the clutch transmission assembly is in the working state. When the shift part is disconnected from the clutch transmission assembly, the clutch transmission assembly is in the retracted state. The drive assembly includes: a slide bar, a connecting seat, a connecting rod, and a first hydraulic cylinder; The connecting seat has a through hole that is not less than the diameter of the drive shaft and not greater than the length of the slide rod. The side wall of the through hole has an annular groove that can accommodate the slide rod. The bottom of the annular groove has a limiting hole that connects to the outside of the connecting seat. The drive shaft has a pair of guide holes. One end of the connecting rod is slidably connected to the first oil cylinder, and the other end is connected to one side of the connecting seat. The connecting seat is sleeved on the drive shaft. The slide rod is inserted into the connecting seat through the limiting hole, passes through one guide hole to connect to the shift lever, and then passes through the other guide hole. Both ends of the slide rod are located in the annular groove and can rotate with the drive shaft in the annular groove. The first oil cylinder can drive the connecting seat to move along the axial direction of the drive shaft through the connecting rod. The shifting part is a radially convex shifting boss, and the two ends of the shifting boss are provided with inclined transition surfaces. The clutch transmission assembly includes a pawl and a spring plate, and the transmission shaft is provided with a mounting hole for mounting the pawl; The pawl is fitted into the mounting hole via a spring clip. The pawl has a transmission part inside the drive shaft and a locking part outside the drive shaft. The transmission part is used to abut against the shift boss. When the clutch transmission assembly is in use, the transmission part is abutted by the shift boss, and the locking part is outside the mounting hole. When the clutch transmission assembly is in the retracted state, the transmission part is not abutted by the shift boss, and the locking part retracts into the mounting hole under the action of the spring clip.

2. The shifting structure according to claim 1, characterized in that, The inner wall of the mounting hole is provided with an insertion hole, and the side wall of the pawl away from the transmission part is provided with a limiting groove. One end of the spring is bent and folded to form a fixed end. The fixed end of the spring is inserted into the insertion hole, and the other end of the spring is embedded in the limiting groove, and the spring is set to fit against the bottom wall of the limiting groove.

3. A transmission system, comprising the shifting structure according to any one of claims 1-2, characterized in that, Also includes: Housing, and a multi-stage drive wheel assembly mounted on the drive shaft; The drive shaft is rotatably connected to the housing; The shifting structure allows the clutch transmission assembly to be in use, and the clutch transmission assembly allows any stage of the multi-stage drive wheel set to be connected to the drive shaft. The distance between the shift lever and the connecting rod is less than or greater than the maximum inner diameter of the multi-stage drive wheel assembly, and the first hydraulic cylinder is fixed on the housing.

4. A bicycle, characterized in that, Includes the transmission system described in claim 3.

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