Gearbox

Abstract

The invention discloses a gearbox, and relates to the technical field of motorcycle transmission, the gearbox comprises a gearbox body, the gearbox body is internally provided with an input shaft, a first gear, a first sliding assembly, a first shifting fork assembly, a change gear, a transmission gear, a first bevel gear, a second sliding assembly, a second shifting fork assembly, a second bevel gear and an output shaft; the first sliding assembly comprises a first sliding shaft, a sliding gear, a first sliding gear sleeve and a bearing sleeve. One end of the first sliding shaft is fixedly arranged at the output end of the input shaft, the first sliding shaft is sleeved with the sliding gear, the sliding gear synchronously rotates along with the first sliding shaft, the outer surface of the sliding gear is sleeved with the first sliding gear sleeve, and the first sliding gear sleeve can slide left and right relative to the sliding gear. The other end of the first sliding shaft is sleeved with a bearing sleeve, and the bearing sleeve can freely rotate relative to the first sliding shaft. The first gear is arranged at the output end of the input shaft, the first gear can freely rotate relative to the input shaft, the input end of the change gear is connected with the first gear, and the input end of the transmission gear is connected with the output end of the change gear.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycle transmission, and in particular relates to a gearbox. Background Art

[0002] The motorcycle gearbox is a key component of the motorcycle transmission system, which is mainly used to change the speed and torque output by the engine to adapt to different driving conditions and driving requirements.

[0003] From a functional perspective, it mainly plays the role of changing the engine output speed and torque. The engine speed-torque characteristics are relatively fixed, but in actual riding, motorcycles will face a variety of road conditions and driving requirements; for example, when the motorcycle starts or climbs a hill, a larger torque is required to drive the vehicle forward. At this time, the gearbox can convert the engine power into a high-torque, low-speed output; when driving at high speed on a flat road, it can convert the power into a high-speed, relatively low-torque output, allowing the motorcycle to run efficiently.

[0004] Structurally, it includes main parts such as input shaft, output shaft, gear set, and shift mechanism. The input shaft receives power from the engine, just like a power entrance. The gear set is the core of the gearbox, and usually has multiple gears of different sizes. These gears mesh with each other, and their size and combination determine different transmission ratios, thereby realizing the speed shifting function. The shift mechanism is used to control the combination of gear sets. In a manual transmission, the rider operates the shift lever, which drives the shift fork through the mechanical connecting rod to make different gears mesh or disengage, thereby realizing gear switching.

[0005] However, traditional motorcycle gearboxes have obvious limitations when dealing with complex driving conditions. For example, traditional motorcycle gearboxes either have insufficient torque at low speeds, resulting in difficulties in starting and climbing, or have limited transmission efficiency at high speeds, affecting top speed and riding stability.

[0006] In addition, traditional motorcycle high and low speed transmissions often need to be switched to neutral first and then to the desired gear during the gear shifting process. This gear shifting method has many inconveniences. For example, when emergency acceleration or deceleration requires rapid switching between high and low speeds, operating through neutral will increase the gear shifting time, resulting in power interruption, affecting the acceleration performance and riding smoothness of the motorcycle; moreover, frequent operations through neutral may cause gear knocking due to improper operation, damage the gears inside the transmission, and reduce the service life of the transmission; and, for some complex road conditions where frequent switching between high and low speeds is required, this traditional gear shifting method will increase the rider's operating burden and reduce the riding experience. Summary of the invention

[0007] The purpose of the present invention is to provide a gearbox to solve the technical problems mentioned in the background technology.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A gearbox comprises a gearbox body, wherein an input shaft, a first gear, a first sliding assembly, a first shift fork assembly, a speed change gear, a transmission gear, a first bevel gear, a second sliding assembly, a second shift fork assembly, a second bevel gear and an output shaft are arranged in the gearbox body;

[0010] The first sliding assembly includes a first sliding shaft, a sliding gear, a first sliding gear sleeve and a bearing sleeve;

[0011] One end of the first sliding shaft is fixedly arranged at the output end of the input shaft, the sliding gear is sleeved on the first sliding shaft, the sliding gear rotates synchronously with the first sliding shaft, the first sliding gear sleeve is sleeved on the outer surface of the sliding gear, and the first sliding gear sleeve can slide left and right relative to the sliding gear, and the other end of the first sliding shaft is sleeved with a bearing sleeve, and the bearing sleeve can rotate freely relative to the first sliding shaft;

[0012] The first gear is arranged at the output end of the input shaft, the first gear can rotate freely relative to the input shaft, the speed gear input end is connected to the first gear, and the transmission gear input end is connected to the speed gear output end;

[0013] The first sliding gear sleeve is located between the first gear and the input end of the transmission gear, the first shift fork assembly is arranged on the first sliding gear sleeve, and the first shift fork assembly is used to shift the first sliding gear sleeve to connect with the first gear or the transmission gear;

[0014] The second sliding assembly includes a second sliding shaft and a second sliding gear sleeve;

[0015] One end of the second sliding shaft is fixedly arranged at the output end of the transmission gear, the second sliding gear sleeve is sleeved on the second sliding shaft, and the second sliding gear sleeve can slide left and right relative to the second sliding shaft;

[0016] The first bevel gear is arranged at the output end of the transmission gear, the first bevel gear is located between the output end of the transmission gear and the second sliding gear sleeve, and the first bevel gear can rotate freely relative to the output end of the transmission gear;

[0017] A second bevel gear is disposed at the other end of the second sliding shaft, and the second bevel gear can rotate freely relative to the second sliding shaft;

[0018] The first bevel gear and the second bevel gear are meshed with the output shaft;

[0019] The second shift fork assembly is disposed on the second sliding gear sleeve, and the second shift fork assembly is used to shift the second sliding gear sleeve to connect with the first bevel gear or the second bevel gear;

[0020] The tooth profiles of the first bevel gear and the second bevel gear are arranged in opposite ways.

[0021] In a preferred solution, the gearbox body comprises an upper case cover and a lower case cover;

[0022] The input shaft, the first gear, the first sliding assembly, the first shift fork assembly, the speed gear and the transmission gear are arranged in the upper case cover; the input shaft, the speed gear, the transmission gear and the upper case cover are connected via bearings, a bearing is arranged between the first gear and the input shaft, and the first gear can rotate relative to the input shaft via the bearing;

[0023] The first bevel gear, the second sliding assembly, the second fork assembly, the second bevel gear and the output shaft are arranged in the lower case cover; the second sliding shaft of the second sliding assembly is connected to the lower case cover through a bearing; bearings are provided between the first bevel gear, the second bevel gear and the second sliding shaft, and the first bevel gear and the second bevel gear can rotate relative to the second sliding shaft through the bearings.

[0024] In a preferred embodiment, first sliding tooth grooves are respectively provided at both ends of the first sliding tooth sleeve, first connecting teeth matching the first sliding tooth grooves are provided on the outer surface of the first gear, and second connecting teeth matching the first sliding tooth grooves are provided at the input end of the transmission gear;

[0025] The first shift fork assembly is used to shift the first sliding gear sleeve to connect with the first connecting tooth of the first gear or the second connecting tooth of the transmission gear.

[0026] Preferably, third connecting teeth are provided at both ends of the second sliding gear sleeve;

[0027] The first bevel gear and the second bevel gear are provided with a second sliding tooth groove matched with the third connecting tooth;

[0028] The second shift fork assembly is used to shift the third connecting tooth on the second sliding gear sleeve to connect with the first bevel gear or the second bevel gear.

[0029] In a preferred solution, a plurality of first protrusions are provided on the outer surface of the first sliding shaft, and the first protrusions are arranged along the length direction of the first sliding shaft;

[0030] The inner surface of the sliding gear is provided with a first sliding groove matched with the first protrusion;

[0031] A second sliding groove matching the first protrusion is provided on the inner surface of one end of the first sliding gear sleeve;

[0032] The inner surface of the other end of the first sliding gear sleeve is provided with a slot matched with the outer surface of the sliding gear, and the sliding gear is located in the slot.

[0033] In a preferred embodiment, the speed change gear comprises a second gear, a speed change shaft and a third gear;

[0034] The second gear and the third gear are fixedly arranged at two ends of the speed change shaft, the second gear is meshed with the first gear, and the third gear is meshed with the input end of the transmission gear;

[0035] The number of teeth or the radius of the first gear is greater than the number of teeth or the radius of the third gear, and the number of teeth or the radius of the third gear is greater than the number of teeth or the radius of the second gear.

[0036] Preferably, the transmission gear comprises a fourth gear and a transmission shaft;

[0037] The second connecting tooth is arranged on the transmission shaft, and the second connecting tooth is arranged close to one end of the first sliding gear sleeve;

[0038] The transmission shaft is provided with an introduction hole adapted to the bearing sleeve, and the introduction hole is arranged close to one end of the bearing sleeve;

[0039] The fourth gear is fixedly arranged at the input end of the transmission shaft, the fourth gear is meshed with the third gear, and the number of teeth or radius of the fourth gear is smaller than the number of teeth or radius of the third gear.

[0040] Preferably, the first shift fork assembly includes a first shift fork and a first shift fork connecting rod;

[0041] The first shift fork connecting rod is arranged on the upper box cover, the first shift fork is arranged on the first sliding gear sleeve, the first shift fork connecting rod is connected to the first shift fork, and the first sliding gear sleeve is movably connected to the first shift fork;

[0042] The first shift fork connecting rod cooperates with the first shift fork to drive the first sliding gear sleeve to slide left and right on the first sliding shaft.

[0043] In a preferred embodiment, the second shift fork assembly includes a second shift fork and a second shift fork connecting rod;

[0044] The second shift fork connecting rod is arranged on the lower case cover, the second shift fork is arranged on the second sliding gear sleeve, the second shift fork is connected to the second shift fork connecting rod, and the second shift fork is movably connected to the second sliding gear sleeve;

[0045] The second shift fork cooperates with the second shift fork connecting rod to drive the second sliding gear sleeve to slide left and right on the second sliding shaft.

[0046] Preferably, the output shaft includes a third bevel tooth and an output transmission shaft, the third bevel tooth is arranged on the output transmission shaft, the third bevel tooth is arranged close to one end of the first bevel gear and the second bevel gear, and the third bevel tooth is meshed with the first bevel gear and the second bevel gear.

[0047] Beneficial technical effects of the invention: The present invention provides a gearbox, which, compared with the prior art, has the following advantages by effectively improving the overall structure and assembly method of the gearbox body, the input shaft, the first gear, the first sliding assembly, the first fork assembly, the speed change gear, the transmission gear, the first bevel gear, the second sliding assembly, the second fork assembly, the second bevel gear and the output shaft:

[0048] 1. By arranging the first gear at the output end of the input shaft, the first gear can rotate freely relative to the input shaft, the input end of the speed gear is connected to the first gear, and the input end of the transmission gear is connected to the output end of the speed gear. This structural design enables the power transmission to have the ability of multi-stage change. The power of the input shaft is first transmitted to the freely rotatable first gear, and then to the transmission gear through the speed gear. Since the first gear can rotate freely relative to the input shaft, it can flexibly adjust the relative motion relationship with the input shaft according to different connection and transmission conditions; and, through the connection between the first gear and the transmission gear, a variety of possible transmission paths are actually created. Different transmission ratio combinations can be achieved by designing different speed gear parameters, such as the number of teeth, module, etc., to ensure the transmission stability of the gearbox.

[0049] Second, by adopting the first sliding assembly to combine the first sliding shaft, the sliding gear, the first sliding gear sleeve and the bearing sleeve, this combination can realize the change of multiple transmission ratios in a limited space. The first sliding shaft serves as the basic supporting structure, and the sliding gear and the sliding gear sleeve can flexibly move along its axial direction. Compared with some complex independent shifting mechanisms, it occupies less space, and the existence of the sliding gear sleeve makes the adjustment of the transmission ratio more flexible. By moving the gear sleeve to make different sliding gears mesh with other fixed gears, the transmission path and transmission ratio can be quickly changed. This flexible adjustment method can meet the power and speed requirements under different working conditions, so as to ensure that the motorcycle can select a larger transmission ratio to obtain a larger torque when starting and climbing, and switch to a smaller transmission ratio to increase the speed when driving at high speed; at the same time, the bearing sleeve can withstand axial and radial loads, and provide stable support for the entire sliding assembly, which reduces the vibration and deviation of the sliding shaft during high-speed rotation and shifting, and protects the sliding gear and the gear sleeve from abnormal force.

[0050] 3. By respectively providing first sliding tooth grooves at both ends of the first sliding tooth sleeve, providing first connecting teeth matched with the first sliding tooth grooves on the outer surface of the first gear, and providing second connecting teeth matched with the first sliding tooth grooves at the input end of the transmission gear, the design that the first sliding tooth grooves are matched with the first connecting teeth and the second connecting teeth makes the power transmission more accurate. When the first sliding tooth sleeve moves, its tooth grooves mesh with the first connecting teeth of the first gear or the second connecting teeth of the transmission gear, which can ensure the stable and accurate transmission of power between the various components. The precise matching of the tooth grooves and teeth can reduce the energy loss and vibration in the process of power transmission. The first shift fork assembly shifts the first The sliding gear sleeve is connected to the first connecting tooth of the first gear or the second connecting tooth of the transmission gear. The first shift fork assembly can accurately shift the first sliding gear sleeve. The design of the shift fork and the cooperation with the gear sleeve can ensure that the first sliding gear sleeve is accurately connected to the first connecting tooth of the first gear or the second connecting tooth of the transmission gear during the movement. This accuracy avoids power transmission problems caused by incorrect or inadequate connection, making the gear shifting action of the transmission more accurate and reliable; and, through the cooperation between the first shift fork assembly and the first sliding gear sleeve, the required gear can be engaged without switching to neutral during high and low speed shifting.

[0051] Fourth, by adopting the second sliding assembly in the form of a second sliding shaft and a second sliding gear sleeve, one end of the second sliding shaft is fixedly arranged at the output end of the transmission gear, the second sliding gear sleeve is sleeved on the second sliding shaft, and the second sliding gear sleeve can slide left and right relative to the second sliding shaft; the second sliding gear sleeve slides on the second sliding shaft to achieve gear shifting, which helps to improve the smoothness of gear shifting. Compared with some traditional rigid gear shifting mechanisms, the sliding of the gear sleeve can buffer the impact during the gear shifting process to a certain extent.

[0052] 5. The second shift fork connecting rod cooperates with the second shift fork to switch the gearbox to reverse gear. The second shift fork drives the second sliding gear sleeve to slide left and right on the second sliding shaft to ensure that the third connecting tooth on the second sliding gear sleeve is connected to the first bevel gear or the second bevel gear. The design of the second shift fork connecting rod and the second shift fork cooperating with each other to drive the second sliding gear sleeve can realize precise control of the transmission path. In this way, the third connecting tooth on the second sliding gear sleeve can be accurately connected to the first bevel gear or the second bevel gear, so that reverse gear switching can be realized in any gear position of the gearbox.

[0053] 6. By making the number of teeth or radius of the first gear greater than the number of teeth or radius of the third gear and the number of teeth or radius of the third gear greater than the number of teeth or radius of the second gear, and the number of teeth or radius of the fourth gear smaller than the number of teeth or radius of the third gear, the number of teeth or radius of the first gear is greater than the number of teeth or radius of the second gear. According to the principle of gear transmission, in the process of power being transmitted from the first gear to the second gear, the effects of torque amplification and speed reduction can be achieved. When the third gear and the fourth gear are transmitted, the effects of torque amplification and speed reduction can be achieved again. This feature is very advantageous in working conditions requiring larger torque such as starting or climbing a motorcycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 A schematic cross-sectional view of the gearbox body and internal assembly provided by the present invention;

[0056] Figure 2 A schematic diagram of the assembly of the gearbox body, the input shaft, the first gear, the first sliding assembly, the first shift fork assembly, the speed change gear and the transmission gear provided by the present invention;

[0057] Figure 3 An exploded schematic diagram of the assembly of the first gear and the first sliding assembly provided by the present invention;

[0058] Figure 4 This is an enlarged schematic diagram of the transmission of the first gear, the speed change gear and the transmission gear provided by the present invention;

[0059] Figure 5 A schematic side view of the assembly of the fourth gear and the second connecting tooth provided by the present invention;

[0060] Figure 6 This is an enlarged schematic diagram of the assembly of the input shaft and the transmission gear provided by the present invention;

[0061] Figure 7 A schematic side view of the assembly of the sliding gear and the first sliding groove provided by the present invention;

[0062] Figure 8 A schematic diagram of the assembly of the first bevel gear, the second bevel gear and the second sliding assembly provided by the present invention;

[0063] Fig. 9 A schematic diagram of the assembly of the first bevel gear or the second bevel gear and the second sliding tooth groove provided by the present invention;

[0064] Description of reference numerals;

[0065] 1-gearbox body; 101-upper case cover; 102-lower case cover; 2-input shaft; 3-first gear; 31-first connecting tooth; 4-first sliding assembly; 41-first sliding shaft; 411-first protrusion; 42-sliding gear; 421-first slide groove; 43-first sliding gear sleeve; 431-second slide groove; 432-slot; 44-bearing sleeve; 441-introduction hole; 45-first sliding gear groove; 5-first shift fork assembly; 51-first shift fork; 52-first shift fork connecting rod; 6-speed gear; 61 -second gear; 62-speed shaft; 63-third gear; 7-transmission gear; 71-second connecting tooth; 72-fourth gear; 73-transmission shaft; 8-first bevel gear; 9-second sliding assembly; 91-second sliding shaft; 92-second sliding gear sleeve; 921 third connecting tooth; 922-second sliding tooth groove; 10-second shift fork assembly; 103-second shift fork; 104-second shift fork connecting rod; 11-second bevel gear; 12-output shaft; 121-third bevel tooth; 122-output transmission shaft. DETAILED DESCRIPTION

[0066] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0067] Example 1

[0068] See also Figures 1 to 9 A gearbox comprises a gearbox body 1, in which an input shaft 2, a first gear 3, a first sliding assembly 4, a first shift fork assembly 5, a speed change gear 6, a transmission gear 7, a first bevel gear 8, a second sliding assembly 9, a second shift fork assembly 10, a second bevel gear 11 and an output shaft 12 are arranged;

[0069] The first sliding assembly 4 includes a first sliding shaft 41, a sliding gear 42, a first sliding gear sleeve 43 and a bearing sleeve 44;

[0070] One end of the first sliding shaft 41 is fixedly arranged at the output end of the input shaft 2, the sliding gear 42 is sleeved on the first sliding shaft 41, the sliding gear 42 rotates synchronously with the first sliding shaft 41, the first sliding gear sleeve 43 is sleeved on the outer surface of the sliding gear 42, and the first sliding gear sleeve 43 can slide left and right relative to the sliding gear 42, and the other end of the first sliding shaft 41 is sleeved with a bearing sleeve 44, and the bearing sleeve 44 can rotate freely relative to the first sliding shaft 41;

[0071] The first gear 3 is arranged at the output end of the input shaft 2, and the first gear 3 can rotate freely relative to the input shaft 2. The input end of the speed change gear 6 is connected to the first gear 3, and the input end of the transmission gear 7 is connected to the output end of the speed change gear 6;

[0072] The first sliding gear sleeve 43 is located between the first gear 3 and the input end of the transmission gear 7. The first shift fork assembly 5 is provided on the first sliding gear sleeve 43. The first shift fork assembly 5 is used to shift the first sliding gear sleeve 43 to connect with the first gear 3 or the transmission gear 7.

[0073] The second sliding assembly 9 includes a second sliding shaft 91 and a second sliding gear sleeve 92;

[0074] One end of the second sliding shaft 91 is fixed to the output end of the transmission gear 7, and the second sliding gear sleeve 92 is sleeved on the second sliding shaft 91. The second sliding gear sleeve 92 can slide left and right relative to the second sliding shaft 91;

[0075] The first bevel gear 8 is disposed at the output end of the transmission gear 7. The first bevel gear 8 is located between the output end of the transmission gear 7 and the second sliding gear sleeve 92. The first bevel gear 8 can rotate freely relative to the output end of the transmission gear 7.

[0076] A second bevel gear 11 is disposed at the other end of the second sliding shaft 91, and the second bevel gear 11 can rotate freely relative to the second sliding shaft 91;

[0077] The first bevel gear 8 and the second bevel gear 11 are meshed with the output shaft 12;

[0078] The second shift fork assembly 10 is disposed on the second sliding gear sleeve 92, and the second shift fork assembly 10 is used to shift the second sliding gear sleeve 92 to connect with the first bevel gear 8 or the second bevel gear 11;

[0079] The tooth profiles of the first bevel gear 8 and the second bevel gear 11 are arranged in opposite ways.

[0080] In this embodiment, the gearbox body 1 includes an upper case cover 101 and a lower case cover 102;

[0081] The input shaft 2, the first gear 3, the first sliding assembly 4, the first shift fork assembly 5, the speed gear 6 and the transmission gear 7 are arranged in the upper case cover 101; the input shaft 2, the speed gear 6, the transmission gear 7 and the upper case cover 101 are connected through bearings, and a bearing is arranged between the first gear 3 and the input shaft 2, and the first gear 3 can rotate relative to the input shaft 2 through the bearing;

[0082] The first bevel gear 8, the second sliding assembly 9, the second fork assembly 10, the second bevel gear 11 and the output shaft 12 are arranged in the lower case cover 102; the second sliding shaft 91 of the second sliding assembly 9 is connected to the lower case cover 102 through a bearing; bearings are provided between the first bevel gear 8, the second bevel gear 11 and the second sliding shaft 91, and the first bevel gear 8 and the second bevel gear 11 can rotate relative to the second sliding shaft 91 through the bearings.

[0083] In this embodiment, first sliding tooth grooves 45 are respectively provided at both ends of the first sliding tooth sleeve 43, first connecting teeth 31 adapted to the first sliding tooth grooves 45 are provided on the outer surface of the first gear 3, and second connecting teeth 71 adapted to the first sliding tooth grooves 45 are provided at the input end of the transmission gear 7;

[0084] The first shift fork assembly 5 is used to shift the first sliding gear sleeve 43 to connect with the first connecting teeth 31 of the first gear 3 or the second connecting teeth 71 of the transmission gear 7 .

[0085] In this embodiment, third connecting teeth 921 are provided at both ends of the second sliding gear sleeve 92;

[0086] The first bevel gear 8 and the second bevel gear 11 are provided with a second sliding tooth groove 922 adapted to the third connecting tooth 921;

[0087] The second shift fork assembly 10 is used to shift the third connecting tooth 921 on the second sliding gear sleeve 92 to connect with the first bevel gear 8 or the second bevel gear 11 .

[0088] In this embodiment, a plurality of first protrusions 411 are disposed on the outer surface of the first sliding shaft 41 , and the first protrusions 411 are arranged along the length direction of the first sliding shaft 41 ;

[0089] The inner surface of the sliding gear 42 is provided with a first sliding groove 421 adapted to the first protrusion 411;

[0090] A second sliding groove 431 adapted to the first protrusion 411 is provided on the inner surface of one end of the first sliding gear sleeve 43;

[0091] A slot 432 matched with the outer surface of the sliding gear 42 is formed on the inner surface of the other end of the first sliding gear sleeve 43 , and the sliding gear 42 is located in the slot 432 .

[0092] In this embodiment, the speed change gear 6 includes a second gear 61, a speed change shaft 62 and a third gear 63;

[0093] The second gear 61 and the third gear 63 are fixedly arranged at both ends of the speed change shaft 62, the second gear 61 is meshed with the first gear 3, and the third gear 63 is meshed with the input end of the transmission gear 7;

[0094] The number of teeth or radius of the first gear 3 is greater than the number of teeth or radius of the third gear 63 , and the number of teeth or radius of the third gear 63 is greater than the number of teeth or radius of the second gear 61 .

[0095] In this embodiment, the transmission gear 7 includes a fourth gear 72 and a transmission shaft 73;

[0096] The second connecting tooth 71 is disposed on the transmission shaft 73, and the second connecting tooth 71 is disposed close to one end of the first sliding gear sleeve 43;

[0097] The transmission shaft 73 is provided with an introduction hole 441 adapted to the bearing sleeve 44, and the introduction hole 441 is arranged near one end of the bearing sleeve 44;

[0098] The fourth gear 72 is fixed to the input end of the transmission shaft 73 . The fourth gear 71 is meshed with the third gear 63 . The number of teeth or radius of the fourth gear 71 is smaller than that of the third gear 63 .

[0099] In this embodiment, the first shift fork assembly 5 includes a first shift fork 51 and a first shift fork connecting rod 52;

[0100] The first shift fork connecting rod 52 is disposed on the upper case cover 101, the first shift fork 51 is disposed on the first sliding gear sleeve 43, the first shift fork connecting rod 52 is connected to the first shift fork 51, and the first sliding gear sleeve 43 is movably connected to the first shift fork 51;

[0101] The first shift fork connecting rod 52 cooperates with the first shift fork 51 to drive the first sliding gear sleeve 43 to slide left and right on the first sliding shaft 41 .

[0102] In this embodiment, the second shift fork assembly 10 includes a second shift fork 103 and a second shift fork connecting rod 104;

[0103] The second shift fork connecting rod 104 is disposed on the lower case cover 102, the second shift fork 103 is disposed on the second sliding gear sleeve 92, the second shift fork 103 is connected to the second shift fork connecting rod 104, and the second shift fork 103 is movably connected to the second sliding gear sleeve 92;

[0104] The second shift fork 103 cooperates with the second shift fork connecting rod 104 to drive the second sliding gear sleeve 92 to slide left and right on the second sliding shaft 91 .

[0105] In this embodiment, the output shaft 12 includes a third bevel tooth 121 and an output transmission shaft 122. The third bevel tooth 121 is arranged on the output transmission shaft 122. The third bevel tooth 121 is arranged near one end of the first bevel gear 8 and the second bevel gear 11. The third bevel tooth 121 is meshed with the first bevel gear 8 and the second bevel gear 11.

[0106] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0107] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention.

[0108] The above are only preferred embodiments of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as protection of the present invention.

Claims

1. A gearbox, comprising a gearbox body (1), characterized in that: The gearbox body (1) is provided with an input shaft (2), a first gear (3), a first sliding assembly (4), a first shift fork assembly (5), a speed change gear (6), a transmission gear (7), a first bevel gear (8), a second sliding assembly (9), a second shift fork assembly (10), a second bevel gear (11) and an output shaft (12); The first sliding assembly (4) comprises a first sliding shaft (41), a sliding gear (42), a first sliding gear sleeve (43) and a bearing sleeve (44); One end of the first sliding shaft (41) is fixedly arranged at the output end of the input shaft (2); the sliding gear (42) is sleeved on the first sliding shaft (41); the sliding gear (42) rotates synchronously with the first sliding shaft (41); the first sliding gear sleeve (43) is sleeved on the outer surface of the sliding gear (42); the first sliding gear sleeve (43) can slide leftward and rightward relative to the sliding gear (42); the other end of the first sliding shaft (41) is sleeved with a bearing sleeve (44); the bearing sleeve (44) can rotate freely relative to the first sliding shaft (41); The first gear (3) is arranged at the output end of the input shaft (2), the first gear (3) can rotate freely relative to the input shaft (2), the input end of the speed change gear (6) is connected to the first gear (3), and the input end of the transmission gear (7) is connected to the output end of the speed change gear (6); The first sliding gear sleeve (43) is located between the first gear (3) and the input end of the transmission gear (7), the first shift fork assembly (5) is arranged on the first sliding gear sleeve (43), and the first shift fork assembly (5) is used to shift the first sliding gear sleeve (43) to connect with the first gear (3) or the transmission gear (7); The second sliding assembly (9) comprises a second sliding shaft (91) and a second sliding gear sleeve (92); One end of the second sliding shaft (91) is fixedly arranged at the output end of the transmission gear (7), and the second sliding gear sleeve (92) is sleeved on the second sliding shaft (91), and the second sliding gear sleeve (92) can slide leftward and rightward relative to the second sliding shaft (91); The first bevel gear (8) is arranged at the output end of the transmission gear (7), the first bevel gear (8) is located between the output end of the transmission gear (7) and the second sliding gear sleeve (92), and the first bevel gear (8) can rotate freely relative to the output end of the transmission gear (7); A second bevel gear (11) is provided at the other end of the second sliding shaft (91), and the second bevel gear (11) is freely rotatable relative to the second sliding shaft (91); The first bevel gear (8) and the second bevel gear (11) are meshed with the output shaft (12); The second shift fork assembly (10) is arranged on the second sliding gear sleeve (92), and the second shift fork assembly (10) is used to shift the second sliding gear sleeve (92) to connect with the first bevel gear (8) or the second bevel gear (11); The tooth profiles of the first bevel gear (8) and the second bevel gear (11) are arranged in opposite ways.

2. A gearbox according to claim 1, characterized in that: The gearbox body (1) comprises an upper case cover (101) and a lower case cover (102); The input shaft (2), the first gear (3), the first sliding assembly (4), the first shift fork assembly (5), the speed gear (6) and the transmission gear (7) are arranged in the upper case cover (101); the input shaft (2), the speed gear (6), the transmission gear (7) and the upper case cover (101) are connected via bearings, a bearing is arranged between the first gear (3) and the input shaft (2), and the first gear (3) can rotate relative to the input shaft (2) via the bearing; The first bevel gear (8), the second sliding assembly (9), the second shift fork assembly (10), the second bevel gear (11) and the output shaft (12) are arranged in the lower case cover (102); the second sliding shaft (91) of the second sliding assembly (9) is connected to the lower case cover (102) via a bearing; a bearing is arranged between the first bevel gear (8), the second bevel gear (11) and the second sliding shaft (91), and the first bevel gear (8) and the second bevel gear (11) are rotatable relative to the second sliding shaft (91) via the bearing.

3. A gearbox according to claim 1, characterized in that: The first sliding tooth sleeve (43) is provided with first sliding tooth grooves (45) at both ends, the outer surface of the first gear (3) is provided with first connecting teeth (31) matched with the first sliding tooth grooves (45), and the input end of the transmission gear (7) is provided with second connecting teeth (71) matched with the first sliding tooth grooves (45); The first shift fork assembly (5) is used to shift the first sliding gear sleeve (43) to connect with the first connecting tooth (31) of the first gear (3) or the second connecting tooth (71) of the transmission gear (7).

4. A gearbox according to claim 1, characterized in that: The second sliding gear sleeve (92) is provided with third connecting teeth (921) at both ends; The first bevel gear (8) and the second bevel gear (11) are provided with a second sliding tooth groove (922) adapted to the third connecting tooth (921); The second shift fork assembly (10) is used to shift the third connecting tooth (921) on the second sliding gear sleeve (92) to connect with the first bevel gear (8) or the second bevel gear (11).

5. A gearbox according to claim 1, characterized in that: The outer surface of the first sliding shaft (41) is provided with a plurality of first protrusions (411), and the first protrusions (411) are arranged along the length direction of the first sliding shaft (41); The inner surface of the sliding gear (42) is provided with a first sliding groove (421) adapted to the first protrusion (411); A second sliding groove (431) adapted to the first protrusion (411) is provided on the inner surface of one end of the first sliding gear sleeve (43); The inner surface of the other end of the first sliding gear sleeve (43) is provided with a slot (432) adapted to the outer surface of the sliding gear (42), and the sliding gear (42) is located in the slot (432).

6. A gearbox according to claim 1, characterized in that: The speed change gear (6) comprises a second gear (61), a speed change shaft (62) and a third gear (63); the second gear (61) and the third gear (63) are fixedly arranged at two ends of the speed change shaft (62); the second gear (61) is meshed with the first gear (3); and the third gear (63) is meshed with the input end of the transmission gear (7); The number of teeth or radius of the first gear (3) is greater than the number of teeth or radius of the third gear (63), and the number of teeth or radius of the third gear (63) is greater than the number of teeth or radius of the second gear (61).

7. A gearbox according to claim 6, characterized in that: The transmission gear (7) comprises a fourth gear (72) and a transmission shaft (73); The second connecting tooth (71) is arranged on the transmission shaft (73), and the second connecting tooth (71) is arranged close to one end of the first sliding tooth sleeve (43); The transmission shaft (73) is provided with an introduction hole (441) adapted to the bearing sleeve (44), and the introduction hole (441) is arranged close to one end of the bearing sleeve (44); The fourth gear (72) is fixedly arranged at the input end of the transmission shaft (73), the fourth gear (71) is meshed with the third gear (63), and the number of teeth or radius of the fourth gear (71) is smaller than the number of teeth or radius of the third gear (63).

8. A gearbox according to claim 2, characterized in that: The first shift fork assembly (5) comprises a first shift fork (51) and a first shift fork connecting rod (52); The first shift fork connecting rod (52) is arranged on the upper box cover (101), the first shift fork (51) is arranged on the first sliding gear sleeve (43), the first shift fork connecting rod (52) is connected to the first shift fork (51), and the first sliding gear sleeve (43) is movably connected to the first shift fork (51); The first shift fork connecting rod (52) cooperates with the first shift fork (51) to shift the first sliding gear sleeve (43) to slide left and right on the first sliding shaft (41).

9. A gearbox according to claim 2, characterized in that: The second shift fork assembly (10) comprises a second shift fork (103) and a second shift fork connecting rod (104); The second shift fork connecting rod (104) is arranged on the lower case cover (102), the second shift fork (103) is arranged on the second sliding gear sleeve (92), the second shift fork (103) is connected to the second shift fork connecting rod (104), and the second shift fork (103) is movably connected to the second sliding gear sleeve (92); The second shift fork (103) cooperates with the second shift fork connecting rod (104) to shift the second sliding gear sleeve (92) to slide left and right on the second sliding shaft (91).

10. A gearbox according to claim 1, characterized in that: The output shaft (12) comprises a third bevel tooth (121) and an output transmission shaft (122); the third bevel tooth (121) is arranged on the output transmission shaft (122), the third bevel tooth (121) is arranged close to one end of the first bevel gear (8) and the second bevel gear (11), and the third bevel tooth (121) is meshed with the first bevel gear (8) and the second bevel gear (11).

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