Gear shifting structure, speed change system and bicycle

Abstract

The invention relates to the technical field of transmission devices, and particularly discloses a gear shifting structure, a speed change system and a bicycle. The gear shifting structure comprises a transmission shaft which is at least partially hollow, a plurality of clutch transmission assemblies, a gear shifting rod and a driving assembly; the clutch transmission assemblies are installed on the transmission shaft and distributed at intervals in the length direction of the transmission shaft. The gear shifting rod is installed in the transmission shaft and can move in the length direction of the transmission shaft. A gear shifting part which can be connected with the clutch transmission assembly is arranged on the gear shifting rod; the clutch transmission assemblies have a retraction state and a use state, the driving assembly is used for driving the gear shifting rod to move, so that a gear shifting part on the gear shifting rod can be connected with any clutch transmission assembly, when the gear shifting part is connected with the clutch transmission assemblies, the clutch transmission assemblies are in the use state, and when the gear shifting part is disconnected from the clutch transmission assemblies, the gear shifting part is in the use state. And the clutch transmission assembly is in a retraction state.

Description

Technical Field

[0001] The invention relates to the technical field of transmission devices, and in particular to a gear shifting structure, a speed change system and a bicycle. Background Art

[0002] The speed change methods of bicycles generally include chain gear change and middle shaft change. The middle shaft change of existing bicycles is mostly achieved by setting a gearbox at the middle shaft pedal. The gearbox is provided with a shift structure that is easy for users to control. The gear shift is achieved by controlling the different meshing of the planetary gear set through the shift structure. However, the shift mechanism of the existing gearbox has a complex structure and occupies a large installation space, resulting in a large overall size and weight of the gearbox, which is not conducive to miniaturization and lightweighting of the gearbox. Summary of the invention

[0003] In view of this, the present invention provides a gear shifting structure for solving the technical problems in the above-mentioned background technology.

[0004] To achieve one or part or all of the above purposes or other purposes, the present invention provides: a shift structure, comprising: a transmission shaft that is at least partially hollow, a plurality of clutch transmission components, a shift lever and a drive component;

[0005] A plurality of groups of the clutch transmission components are installed on the transmission shaft, and the plurality of groups of the clutch transmission components are spaced apart along the length direction of the transmission shaft;

[0006] The shift lever is installed in the transmission shaft, and the shift lever can move along the length direction of the transmission shaft; the shift lever is provided with a shift part which can be connected with the clutch transmission assembly;

[0007] The clutch transmission assembly has a retracted state and a use state. The drive assembly is used to drive the shift lever to move so that the shift portion on the shift lever can be connected to any group of clutch transmission assemblies. When the shift portion is connected to the clutch transmission assembly, the clutch transmission assembly is in the use state. When the shift portion is disconnected from the clutch transmission assembly, the clutch transmission assembly is in the retracted state.

[0008] Preferably, the driving assembly comprises: a sliding rod, a connecting seat, a connecting rod and a first oil cylinder;

[0009] The connecting seat has a through hole that is not less than the diameter of the transmission shaft and not greater than the length of the sliding rod. The side wall of the through hole has an annular groove that can accommodate the sliding rod. The bottom of the annular groove has a limiting hole that 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 sealed and 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 transmission shaft, the sliding rod is inserted into the connecting seat through the limiting hole and passes through a guide hole to connect to the shift rod and then passes through another guide hole, and both ends of the sliding 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 portion is a radially convexly extending 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 a mounting hole for mounting the pawl is provided on the transmission shaft;

[0013] The pawl is assembled into the mounting hole through a spring sheet, and the pawl has a transmission part located inside the transmission shaft and a clamping part located outside the transmission shaft; the transmission part is used to abut against the shift boss, and when the clutch transmission assembly is in use, the transmission part is abutted by the shift boss, and 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 shrinks into the mounting hole under the action of the spring sheet.

[0014] Preferably, an insertion hole is provided on the inner wall of the mounting hole, a limiting groove is provided on a side wall of the pawl away from the transmission part, one end of the spring sheet is bent in half to form a fixed end, the fixed end of the spring sheet is inserted into the insertion hole, the other end of the spring sheet is embedded in the limiting groove, and the spring sheet is arranged to fit 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 rod is sealingly and slidably connected to the second oil cylinder.

[0016] Preferably, the driving assembly comprises: a motor, the inner wall of the transmission shaft is provided with a transmission threaded hole, the outer wall of the shift rod is provided with a rod wall thread connected to the transmission threaded hole, and the shift rod is further provided with a coaxial special-shaped hole;

[0017] The motor is fixed inside the transmission shaft, and the output shaft of the motor is keyed to the special-shaped hole.

[0018] A speed change system comprises the above-mentioned shifting structure, a housing, and a multi-stage driving wheel set installed on the transmission shaft;

[0019] The transmission shaft is rotatably connected to the housing;

[0020] The shifting structure can put the clutch transmission assembly into use, and any one of the multi-stage driving wheel sets can be connected to the transmission shaft through the clutch transmission assembly;

[0021] The distance between the shift lever and the connecting rod is smaller than or larger than the maximum inner diameter of the multi-stage driving wheel set, and the first oil cylinder is fixed on the housing.

[0022] A speed change system comprises the above-mentioned shifting structure, a housing, and a multi-stage driven wheel set mounted on the transmission shaft;

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

[0024] The shifting structure can be used to put the clutch transmission assembly into use, and any one of the multi-stage driven wheel sets can be connected to the transmission shaft through the clutch transmission assembly.

[0025] A bicycle comprises the above-mentioned speed change system.

[0026] Implementing the embodiments of the present invention will have the following beneficial effects:

[0027] After adopting the above scheme, the shift structure sets the shift lever inside the transmission shaft, so that the shift lever does not need an additional assembly position, thereby reducing the overall volume of the shift structure, so that the shift structure occupies less space when used in a transmission system such as a gearbox, which is conducive to miniaturization and lightweight of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] in:

[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 for Figure 3AA section view;

[0034] Figure 5 for Figure 3 BB cross-sectional view;

[0035] Figure 6 is a schematic structural diagram of a transmission shaft in an embodiment;

[0036] Figure 7 is a schematic structural diagram of a ratchet in an embodiment;

[0037] Figure 8 is a schematic diagram of the assembly of the drive assembly and the shift lever in the embodiment;

[0038] Fig. 9 is a schematic structural diagram of a connecting socket in an embodiment;

[0039] Fig.10 It is a schematic diagram of the assembly of the driving assembly including the second oil cylinder in the embodiment;

[0040] Fig.11 for Fig.10 Exploded diagram of the mid-shift structure;

[0041] Fig.12 for Fig.10 A cross-sectional view of the mid-shift structure;

[0042] Fig.13 An exploded view of a drive assembly including a motor in an embodiment;

[0043] Fig.14 is a cross-sectional view of a drive assembly including a motor in an embodiment;

[0044] Fig.15 Schematic diagram of the gear shifting structure in the embodiment being applied to a speed change system Figure 1 ;

[0045] Fig.16 for Fig.15 Schematic diagram of the shifting structure in FIG.

[0046] Fig.17 Schematic diagram of the gear shifting structure in the embodiment being applied to a speed change system Figure 2 .

[0047] Reference numerals:

[0048] 1. Transmission shaft; 10. Guide hole; 11. Mounting hole; 110. Socket; 12. Transmission threaded hole;

[0049] 2. Clutch transmission assembly; 20. Ratchet; 200. Clamping portion; 201. Transmission portion; 202. Limiting groove; 21. Shrapnel;

[0050] 3. Shift lever; 30. Shift portion; 300. Inclined transition surface; 31. Rod wall thread; 32. Special-shaped hole;

[0051] 4. drive assembly; 40. connection seat; 400. through hole; 401. annular groove; 402. limit hole; 41. slide bar; 42. connecting rod; 43. first oil cylinder; 44. blocking member; 45. motor; 450. output shaft; 46. battery; 47. control board; 48. second oil cylinder

[0052] 5. Shell;

[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 those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0057] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0059] As attached Figure 1-9As shown, an embodiment of the present invention provides a shifting structure, which includes a transmission shaft 1 that is at least partially hollow, multiple clutch transmission assemblies 2, a shifting rod 3 and a driving assembly 4; the multiple clutch transmission assemblies 2 are installed on the transmission shaft 1, and the multiple clutch transmission assemblies 2 are spaced apart along the length direction of the transmission shaft 1; the shifting rod 3 is installed in the transmission shaft 1, and the shifting rod 3 can move along the length direction of the transmission shaft 1; the clutch transmission assembly 2 has a retracted state and a use state, and the shifting rod 3 is provided with a shifting part 30 that can be connected to the clutch transmission assembly 2; the driving assembly 4 is used to drive the shifting rod 3 to move, so that the shifting part 30 on the shifting rod 3 can be connected to any group of clutch transmission assemblies 2, when the shifting part 30 is connected to the clutch transmission assembly 2, the clutch transmission assembly 2 is in the use state, and when the shifting part 30 is disconnected from the clutch transmission assembly 2, the clutch transmission assembly 2 is in the retracted state.

[0060] Specifically, the shifting structure can be used in a gearbox with a multi-stage gear set. The transmission shaft 1 is rotatably mounted on the gearbox housing 5, and the transmission shaft 1 is used to install the multi-stage gear set. Through the multi-group clutch transmission assembly 2 corresponding to each stage of the multi-stage gear set, that is, through the movement of the shift lever 3, the corresponding clutch transmission assembly 2 is in use and the corresponding gear can be connected to the transmission shaft 1, so that 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 assembly position, thereby reducing the overall volume of the shifting structure, so that the shifting structure occupies less space when applied to a transmission system such as a transmission, which is conducive to miniaturization and lightness of the transmission. The spacing between the multi-group clutch transmission assemblies 2 in this embodiment is the same. The same spacing is convenient for adapting to the multi-stage gear set and for the drive assembly 4 to control the moving distance of the shift lever 3;

[0061] It should also be noted that the drive assembly 4 can be driven by a motor built-in, such as Fig.13 and Fig.14As shown, the drive assembly includes a motor 45, a battery 46 and a control board 47. Specifically, a transmission threaded hole 12 is provided on the inner wall of the transmission shaft 1, and a rod wall thread 31 connected to the transmission threaded hole 12 is provided on the outer wall of the shift lever 3. The shift lever 3 is also provided with a coaxial special-shaped hole 32; the motor 45 is fixed inside the transmission shaft 1, and the output shaft 450 of the motor 45 is key-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 the key connection between the two allows the output shaft 450 of the motor 45 to drive the shift lever 3 when it rotates. The shift lever 3 and the transmission shaft 1 are threadedly connected, so that the rotation of the shift lever 3 is converted into axial movement, so that the shift part 30 can switch between different clutch transmission components 2. The shift lever 3 can also be moved along the axial direction of the transmission shaft 1 by starting the forward and reverse rotation of the motor 45, so that the shift part 30 is connected to different clutch transmission components 2; in addition, the motor 45, the battery 46 and the control board 47 are distributed inside the transmission shaft 1 from the inside to the outside, and the control board 47 at the outermost end is conducive to signal transmission, which is convenient for the user to control the motor 45.

[0062] See attached Figure 2 and attached Figure 8 The drive assembly 4 can be driven by an external oil cylinder. The drive assembly 4 includes: a slide 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 that is not less than the diameter of the transmission shaft 1 and not greater than the length of the slide rod 41, and the side wall of the through hole 400 has an annular groove 401 that can accommodate the slide rod 41, and the bottom of the annular groove 401 has a limiting hole 402 that is connected to the outside of the connecting seat 40; the power shaft has a pair of guide holes 10, the connecting rod 4 One end of the sliding rod 41 is connected to the first oil cylinder 43, and the other end is connected to 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 a guide hole 10 to connect the shift rod 3 and then passes through another 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 mounted on the transmission shaft 1, and the inner wall of the through hole 400 is provided with an annular groove 401, so that the two ends of the slide rod 41 can be inserted into the annular groove 401, and the slide rod 41 is arranged to pass through the axis of the through hole 400, and the slide rod 41 can be rotated in the annular groove 401 along the circumferential direction of the through hole 400 under force. In this way, after the slide rod 41 is assembled on the transmission shaft 1, when the transmission shaft 1 rotates and drives the slide rod 41 to rotate, the body of the connecting seat 40 will not rotate, avoiding the fixed connection on the connecting seat 40 The connecting rod 42 and the first oil cylinder produce position changes to ensure 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 rod 3, an axially extending guide hole 10 is provided 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 equipped with a sliding rod 41 inside. The sliding rod 41 is limited by the guide hole 10, so that the connecting seat 40 can only move along the axial direction of the transmission shaft 1, thereby driving the shift rod 3 to move axially. In actual installation, one side of the sliding rod 41 The end is inserted into the connecting seat 40 through the limiting hole 402, then passes through a guide hole 10 and radially penetrates the shift rod 3, and finally passes through another guide hole 10 and is inserted into the annular groove 401. At this time, the other end of the slide rod 41 is also placed in the annular groove 401. The slide rod 41 and the shift rod 3 can be connected by a thread, which is convenient for positioning and helps to improve the connection stability between the slide rod 41 and the shift rod 3, ensuring that the axial movement of the connecting seat 40 can stably drive the shift rod 3 to move axially, so that the shift part 30 is connected to the corresponding clutch transmission assembly 2; it should also be noted that the connecting seat 40 is also provided with There is an outer extension portion, and a hole is provided on the outer extension portion for assembling a connecting rod 42. After the connecting rod 42 is connected to the outer extension portion of the connecting seat 40, the connecting rod 42 and the transmission shaft 1 are parallel to each other, 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, and the extension length of the outer extension portion directly determines the distance between the connecting rod 42 and the shift rod 3. In actual application, the distance between the connecting rod 42 and the shift rod 3 can be changed according to the length of the outer extension portion, so that the shift structure can be used in gearboxes of different sizes to adapt to multi-stage gear sets of different specifications.

[0064] In order to prevent the sliding rod 41 from detaching from the connecting seat 40 during use, the driving assembly 4 also includes: a blocking member 44, which is installed in the limiting hole 402. The blocking member 44 is used to limit the axial movement of the sliding rod 41. Specifically, the blocking member 44 can be a headless stud, and the limiting hole 402 is a threaded hole. When the sliding rod 41 is fully inserted into the connecting seat 40 through the limiting hole 402, the blocking member 44 is threadedly connected in the limiting hole 402. After the blocking member 44 is assembled in the limiting hole 402, the end of the blocking member 44 does not extend into the annular groove 401, so as to prevent the blocking member 44 from interfering with the rotation of the sliding rod 41.

[0065] In this embodiment, the first oil cylinder 43 is provided with an oil chamber 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 gearbox according to assembly requirements.

[0066] The drive assembly 4 can also be driven by a built-in oil cylinder, such as Fig.10 , Fig.11 and Fig.12 As shown, the drive assembly 4 includes a second oil cylinder 48, which is coaxially arranged with the transmission shaft 1, and one end of the shift rod 3 is sealed and slidably connected to the second oil cylinder 48. Specifically, the end of the shift rod 3 away from the shift part 30 forms a structure connected to the oil chamber of the second oil cylinder 48, and the shift rod 3 is directly driven axially to move inside the transmission shaft 1 by the second oil cylinder 48, so as to realize the switching of the shift part 30 between different clutch transmission assemblies 2; it should be noted that this method is mainly used in the case where the transmission shaft 1 is used as the output shaft of the gearbox. In actual application, the second oil cylinder 48 is directly fixed on the case of the gearbox, and the oil chamber part of the second oil cylinder 48 connected to the shift rod 3 is inserted into the interior of the transmission shaft 1 to ensure the stable supply of oil in the second oil cylinder 48 and the driving of the shift rod 3; the specific situation of the application of this method on the gearbox is given in the subsequent embodiments.

[0067] like Figure 4 and Figure 5As shown, the shift portion 30 is a radially convexly extending shift boss, and inclined transition surfaces 300 are provided at both ends of the shift boss. The inclined transition surfaces 300 allow the shift rod 3 to move axially to switch different clutch transmission components 2 more smoothly. The shift boss of this embodiment uses an abutment method to control the clutch transmission component 2 to be in a use state or a retracted state. Based on this, this embodiment sets the clutch transmission component 2 as a pawl 20 structure with elasticity, and a ratchet structure can be provided on the corresponding gear. This embodiment controls the clutch transmission component 2 to be in a use state through the shift boss, that is, the pawl structure of the clutch transmission component 2 is engaged with the ratchet mechanism on the corresponding gear to establish a transmission relationship between the corresponding gear and the transmission shaft 1. Otherwise, the clutch transmission component 2 is in a retracted state, that is, the pawl structure is away from the ratchet mechanism on the corresponding gear. The structural composition of the clutch transmission component 2 will be further described later:

[0068] In this embodiment, the clutch transmission assembly 2 specifically includes: a pawl 20 and a spring piece 21, and a mounting hole 11 for mounting the pawl 20 is provided on the transmission shaft 1; the pawl 20 is assembled into the mounting hole 11 through the spring piece 21, and the pawl 20 has a transmission part 201 located inside the transmission shaft 1 and a clamping part 200 located outside the transmission shaft 1; the transmission part 201 is used to abut against the shift boss, and when the clutch transmission assembly 2 is in use, the transmission part 201 is abutted by the shift boss, and the clamping part 200 is outside the mounting hole 11; when the clutch transmission assembly 2 is in a retracted state, the transmission part 201 is not abutted by the shift boss, and the clamping part 200 shrinks into the mounting hole 11 under the action of the spring piece 21. Specifically, an insertion hole 110 is provided on the inner wall of the mounting hole 11, and a limiting groove 202 is provided on one 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, and the other end of the spring piece 21 is embedded in the limiting groove 202. The spring piece 21 is arranged to fit the bottom wall of the limiting groove 202. The pawl 20 is assembled in the mounting hole 11 through the spring piece 21 to improve the stability of the pawl 20 in the mounting hole 11. When the transmission part 201 is not abutted by the shift boss, when the ratchet wheel connected to the pawl 20 rotates in the opposite direction, the pawl 20 can be retracted in the mounting hole 11 to avoid connection when no connection is 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 the transmission part 201, so that the clamping part 200 of the pawl 20 is outside the mounting hole 11, and the pawl 20 is restricted by the shift boss and cannot retreat. 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, and can also be fixed on the multi-stage gear set in the form of an additional installation. The multi-stage gear set is a transmission gear of the shift structure applied to the gearbox.

[0069] See attached Fig.15 and attached Fig.16 , this embodiment also provides a speed change system, including the above-mentioned shifting structure, a housing 5, and a 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 clutch transmission assembly 2 can be put into use through the shifting structure, and any stage of the multi-stage driving wheel set 6 can be connected to the transmission shaft 1 through the clutch transmission assembly 2; the distance between the shift lever 3 and the connecting rod 42 is smaller 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 outer diameter of the multi-stage driving wheel set 6 of the transmission system is relatively large, and the internal space of the shell is relatively small. In order to avoid the external assembly of the first oil cylinder and the first oil cylinder 43 causing the volume of the shell 5 to be further increased, the distance between the shift lever 3 and the connecting rod 42 is set to be smaller than the maximum inner diameter of the multi-stage driving wheel set 6 in this embodiment. Specifically, an accommodating groove is opened on the gear with the largest diameter of the multi-stage driving wheel set 6, and the connecting seat 40 is distributed in the accommodating groove, while the first oil cylinder 43 is directly fixed on the adjacent shell 5, and the length of the connecting rod 42 is correspondingly reduced.

[0072] See attached Figure 8 , Attachment Fig.17 , this embodiment also provides a speed change system, including the above-mentioned shifting structure, a housing 5, and a 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 clutch transmission assembly 2 can be put into use through the shifting structure, and any one of the multi-stage driving wheel sets 6 can be connected to the transmission shaft 1 through the clutch transmission assembly 2; the distance between the shifting rod 3 and the connecting rod 42 is larger 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. The difference from the above-mentioned speed change system is that the outer diameter of the multi-stage driving wheel set 6 of the present speed change system is smaller, and there is still extra space available in the housing 5. In this case, the present embodiment makes the distance between the shifting rod 3 and the connecting rod 42 larger than the maximum inner diameter of the multi-stage driving wheel set 6, so that the connecting rod 42 can move 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 set on any side of the housing 5 according to actual needs to facilitate the connection of the external oil pipe. It should also be noted that the speed change system also has an output shaft 8 and a multi-stage driven wheel set 7 mounted on the output shaft 8, wherein the output shaft 8 adopts a structure having the following structure: Figure 8The transmission shaft 1 shown in the oil cylinder built-in type is replaced. For the convenience of explanation and distinction, the transmission shaft 1 is subsequently replaced by an output shaft 8: 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 wheel set 7. Accordingly, since the second oil cylinder 48 needs to maintain a continuous supply of oil and does not rotate, the second oil cylinder 48 is fixed to the housing 5 in this embodiment, 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 can achieve the switching of multiple clutch transmission assemblies 2 on the shaft by moving, so that any one-stage gear of the multi-stage driven wheel set 7 establishes a transmission connection with the output shaft 8.

[0074] It should also be noted that the above-mentioned speed change system can also adopt a drive component 4 as a motor built-in drive mode, or a combination of multiple modes such as an external cylinder drive mode and a cylinder built-in drive mode. In actual production, it can be selected according to needs.

[0075] In other embodiments, a bicycle is provided, comprising any one of the above-mentioned speed change systems.

[0076] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A gear shifting structure, characterized in that: include: an at least partially hollow transmission shaft, multiple clutch transmission assemblies, a shift lever, and a drive assembly; A plurality of groups of the clutch transmission components are installed on the transmission shaft, and the plurality of groups of the clutch transmission components are spaced apart along the length direction of the transmission shaft; The shift lever is installed in the transmission shaft, and the shift lever can move along the length direction of the transmission shaft; the shift lever is provided with a shift part which can be connected with the clutch transmission assembly; The clutch transmission assembly has a retracted state and a use state. The drive assembly is used to drive the shift lever to move so that the shift portion on the shift lever can be connected to any group of clutch transmission assemblies. When the shift portion is connected to the clutch transmission assembly, the clutch transmission assembly is in the use state. When the shift portion is disconnected from the clutch transmission assembly, the clutch transmission assembly is in the retracted state.

2. The shift structure according to claim 1, characterized in that: The driving assembly comprises: a sliding rod, a connecting seat, a connecting rod and a first oil cylinder; The connecting seat has a through hole that is not less than the diameter of the transmission shaft and not greater than the length of the sliding rod. The side wall of the through hole has an annular groove that can accommodate the sliding rod. The bottom of the annular groove has a limiting hole that is connected to the outside of the connecting seat. The power shaft has a pair of guide holes, one end of the connecting rod is sealed and 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 transmission shaft, the sliding rod is inserted into the connecting seat through the limiting hole and passes through a guide hole to connect to the shift rod and then passes through another guide hole, and both ends of the sliding 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.

3. The shift structure according to claim 2, characterized in that: The shifting portion is a radially convexly extending shifting boss, and both ends of the shifting boss are provided with inclined transition surfaces.

4. The shift structure according to claim 3, characterized in that: The clutch transmission assembly comprises: a pawl and a spring, and the transmission shaft is provided with a mounting hole for mounting the pawl; The pawl is assembled into the mounting hole through a spring sheet, and the pawl has a transmission part located inside the transmission shaft and a clamping part located outside the transmission shaft; the transmission part is used to abut against the shift boss, and when the clutch transmission assembly is in use, the transmission part is abutted by the shift boss, and 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 shrinks into the mounting hole under the action of the spring sheet.

5. The shift structure according to claim 4, characterized in that: An insertion hole is provided on the inner wall of the mounting hole, a limiting groove is provided on a side wall of the pawl away from the transmission part, one end of the spring sheet is bent in half to form a fixed end, the fixed end of the spring sheet is inserted into the insertion hole, the other end of the spring sheet is embedded in the limiting groove, and the spring sheet is arranged to fit the bottom wall of the limiting groove.

6. The shift structure according to claim 1, characterized in that: 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 rod is sealingly and slidably connected to the second oil cylinder.

7. The shift structure according to claim 1, characterized in that: The driving assembly comprises: a motor, the inner wall of the transmission shaft is provided with a transmission threaded hole, the outer wall of the shift rod is provided with a rod wall thread connected to the transmission threaded hole, and the shift rod is also provided with a coaxial special-shaped hole; The motor is fixed inside the transmission shaft, and the output shaft of the motor is keyed to the special-shaped hole.

8. A speed change system, comprising the shift structure according to claims 2 to 5, characterized in that: Also includes: A housing, and a multi-stage driving wheel set mounted on the transmission shaft; The transmission shaft is rotatably connected to the housing; The shifting structure can put the clutch transmission assembly into use, and any one of the multi-stage driving wheel sets can be connected to the transmission shaft through the clutch transmission assembly; The distance between the shift lever and the connecting rod is smaller than or larger than the maximum inner diameter of the multi-stage driving wheel set, and the first oil cylinder is fixed on the housing.

9. A speed change system, comprising the shift structure according to claim 6, characterized in that: Also includes: A housing, and a multi-stage driven wheel set mounted on the transmission shaft; The transmission shaft is rotatably connected to the housing, and one end of the transmission shaft is an output end. The second oil cylinder is distributed at an end of the transmission shaft away from the output end, and the second oil cylinder is fixed on the housing. The shifting structure can be used to put the clutch transmission assembly into use, and any one of the multi-stage driven wheel sets can be connected to the transmission shaft through the clutch transmission assembly.

10. A bicycle, characterized in that: A speed change system comprising the speed change system of claim 8 or 9.

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