Multi-gear four-wheel-drive CVT transmission structure and assembling method

Abstract

The invention relates to the technical field of gearboxes, in particular to a multi-gear four-wheel-drive CVT transmission structure and an assembling method, and the multi-gear four-wheel-drive CVT transmission structure comprises an input shaft assembly, a two-shaft assembly, an intermediate shaft assembly and an output shaft assembly; a transmission structure is arranged between the input shaft assembly and the two-shaft assembly; a gear shifting structure is arranged on the two-shaft assembly; the gear shifting structure is connected with the intermediate shaft assembly; the intermediate shaft assembly is connected with the output shaft assembly and is provided with a four-driving-force output structure; the gear shifting structure can achieve the low-gear and high-gear speed ratio, and different output torque requirements of customers can be met; the four-wheel drive power output structure can provide the four-wheel drive function of the vehicle, and the needed space is smaller and the structure is more compact while powerful power is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to a multi-speed four-wheel drive CVT transmission structure and an assembly method. Background Art

[0002] CVT (Continuously Variable Transmission) uses a transmission belt and master and driven wheels with variable working diameters to transmit power, which can achieve continuous change of the transmission ratio, thereby obtaining the best match between the transmission system and the engine operating conditions, so gear shifting is smoother and there is no impact; but due to the characteristics of the steel belt / chain, it cannot withstand a large input torque, so when encountering a large slope or other special road conditions, there is not enough output torque to pass the special road conditions; general gearboxes can only meet the two-wheel drive application of vehicles, and the vehicles are prone to wheel slippage and deep sinking when encountering sandy, icy and snowy roads.

[0003] After searching, the applicant found that the Chinese patent document with publication number 106051129A disclosed a new CVT gearbox on October 26, 2016, including a driving wheel disk, a driving wheel fixed plate, a driven wheel disk, a driven wheel fixed plate and a silent chain, the silent chain including a chain plate, a bent pin and a short pin, the chain plate is provided with a through hole, a group of pins are respectively inserted at both ends of the through hole, each group of pins includes a bent pin and a short pin, the bent pin and the short pin are fitted to each other, and the side surface of the fitted side forms a rolling surface, the inclination angle of the arc surface of the bent end of the bent pin is 17°~23°, the inclination angle of the arc surface of the straight end of the bent pin is 1°~3°, and the curvature radius of the arc surface of the bent end is 100-170mm, and the curvature radius of the arc surface of the straight end is 150-200mm; this device also cannot solve the above technical problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, it is necessary to provide a multi-speed four-wheel drive CVT transmission structure that can realize high and low gear switching and four-wheel drive. Summary of the invention

[0005] The object of the present invention is to provide a multi-speed four-wheel drive CVT transmission structure and an assembly method capable of realizing high and low gear switching and four-wheel drive.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-speed four-wheel drive CVT transmission structure, including an input shaft assembly, a second shaft assembly, an intermediate shaft assembly and an output shaft assembly; a transmission structure is provided between the input shaft assembly and the second shaft assembly; a shift structure is provided on the second shaft assembly; the shift structure is connected to the intermediate shaft assembly; the intermediate shaft assembly is connected to the output shaft assembly, and is provided with a four-drive force output structure.

[0007] The input shaft assembly includes an input shaft front bearing; the input shaft front bearing is connected to a PGS; the PGS is connected to an input shaft rear bearing; the transmission structure includes a driving bevel gear and a driven bevel gear; the driving bevel gear is connected to the PGS; the driven bevel gear is connected to the two-shaft assembly.

[0008] The two-shaft assembly includes a two-shaft front bearing and a two-shaft rear bearing; the two-shaft front bearing and the two-shaft rear bearing are respectively connected to the driven bevel gear; a steel belt is provided between the driving bevel gear and the driven bevel gear.

[0009] The shifting structure comprises a low-speed driving gear and a high-speed driving gear; the driven bevel gear is connected with a shifting assembly; and the shifting assembly is respectively connected with the low-speed driving gear and the high-speed driving gear.

[0010] The intermediate shaft assembly includes an intermediate shaft; the intermediate shaft is respectively provided with a main reduction driving gear, an intermediate shaft front bearing, an intermediate shaft rear bearing, a parking gear, a low-speed driven gear and a high-speed driven gear; the low-speed driven gear is meshed with the low-speed driving gear; the high-speed driven gear is meshed with the high-speed driving gear.

[0011] The four-drive force output structure includes a PTO active bevel gear; the PTO active bevel gear is arranged on the intermediate shaft; the PTO active bevel gear is connected to a PTO driven bevel gear; and the PTO driven bevel gear is connected to a PTO output shaft.

[0012] The output shaft assembly includes a differential; the differential is respectively connected with a main reduction driven gear, a differential front bearing and a differential rear bearing; the main reduction driven gear is meshed with the main reduction driving gear.

[0013] An assembly method of the multi-speed four-wheel drive CVT transmission structure, the assembly method comprising the following steps:

[0014] S1: Connect the input shaft front bearing, input shaft rear bearing and active bevel gear to PGS;

[0015] S2: Connect the front bearings of the second shaft, the rear bearings of the second shaft and the shift assembly to the driven bevel gear; the driven bevel gear is connected to the driving bevel gear through a steel belt; the shift assembly is connected to the low-speed driving gear and the high-speed driving gear respectively according to the gear position;

[0016] S3: Connect the main reduction driving gear, the intermediate shaft front bearing, the intermediate shaft rear bearing, the parking gear, the low-speed driven gear, the high-speed driven gear and the PTO driving bevel gear to the intermediate shaft respectively; the low-speed driven gear is meshed with the low-speed driving gear; the high-speed driven gear is meshed with the high-speed driving gear; the PTO driving bevel gear is meshed with the PTO driven bevel gear;

[0017] S4: Connecting the main reduction driven gear, the differential front bearing and the differential rear bearing to the differential respectively; the main reduction driven gear is meshed with the main reduction driving gear.

[0018] The S1 includes:

[0019] S11: The input shaft front bearing and the input shaft rear bearing are press-fitted on the PGS; the PGS is connected to the driving bevel gear via a spline;

[0020] The S2 includes:

[0021] S21: The front bearings of the second shaft and the rear bearings of the second shaft are press-fitted on the driven bevel gears; the low-speed driving gear and the high-speed driving gear are sleeved on the driven bevel gears; the shift assembly is connected to the driven bevel gears through splines; the shift fork is used to move the shift assembly to connect with the low-speed driving gear and the high-speed driving gear respectively, so as to realize the switching between low gear and high gear.

[0022] The S3 includes:

[0023] S31: The intermediate shaft and the main reduction driving gear are an integrated structure; the intermediate shaft front bearing and the intermediate shaft rear bearing are press-fitted on the intermediate shaft; the parking gear, the low-speed driven gear, the high-speed driven gear and the PTO driving bevel gear are all connected to the intermediate shaft through splines; the parking gear is connected to the parking cable through a parking pawl;

[0024] The S4 includes:

[0025] S41: The main reduction driven gear is bolted to the differential; the differential front bearing and the differential rear bearing are press-fitted onto the differential.

[0026] The beneficial effects of this application are:

[0027] 1. The present application provides a multi-speed four-wheel drive CVT transmission structure and assembly method, which can be applied to passenger cars, logistics vehicles, UTV (Utility Vehicle, farmer's car or all-terrain vehicle), SSV (Sideby Side Vehicle, side-by-side all-terrain vehicle or high-performance all-terrain vehicle) and other models. The present application adopts a steel belt or chain continuously variable transmission mechanism to achieve a smooth gear shifting and impact-free driving experience; the gear shifting structure can achieve low-gear and high-gear speed ratios, which can meet customers' different output torque requirements.

[0028] 2. The present application adds a pair of PTO bevel gears on the intermediate shaft and increases the PTO output shaft to meet the vehicle's four-wheel drive function. While providing strong power, the required space is smaller and the structure is more compact.

[0029] 3. The present application integrates the parking gear on the intermediate shaft, thereby ensuring safe parking of the vehicle in a stationary state. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 This is a simplified structural diagram of the multi-speed four-wheel drive CVT transmission structure.

[0032] Figure 2 This is a schematic diagram of the structure in which the PTO active bevel gear of the multi-speed four-wheel drive CVT transmission structure is arranged on the right side of the intermediate shaft.

[0033] The marks in the above figure are:

[0034] The markings in the figure are:

[0035] 1. Input shaft front bearing,

[0036] 2. PGS, 201, driving bevel gear, 202, driven bevel gear, 203, steel belt, 204, input shaft,

[0037] 3. Input shaft rear bearing,

[0038] 4. Second shaft front bearing,

[0039] 5. Second shaft rear bearing,

[0040] 6. Low gear driving gear,

[0041] 7. High-grade driving gear,

[0042] 8. Gear shift assembly,

[0043] 9. Main reduction driving gear, 901. Front bearing of intermediate shaft, 902. Rear bearing of intermediate shaft, 903. Low-speed driven gear, 904. High-speed driven gear,

[0044] 10. PTO active bevel gear, 101. PTO driven bevel gear,

[0045] 11. Differential, 111. Main reduction driven gear, 112. Differential front bearing, 113. Differential rear bearing. DETAILED DESCRIPTION

[0046] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0047] Figure 1 The multi-speed four-wheel drive CVT transmission structure shown includes an input shaft assembly, a second shaft assembly, an intermediate shaft assembly and an output shaft assembly; a transmission structure is provided between the input shaft assembly and the second shaft assembly; a shift structure is provided on the second shaft assembly; the shift structure is connected to the intermediate shaft assembly; the intermediate shaft assembly is connected to the output shaft assembly, and a four-wheel drive power output structure is provided.

[0048] The shifting structure can achieve low-speed and high-speed ratios to meet customers' different output torque requirements; the four-wheel drive power output structure can provide the vehicle with four-wheel drive function, which requires less space and has a more compact structure while providing strong power.

[0049] The input shaft assembly includes an input shaft front bearing 1; the input shaft front bearing 1 is connected to PGS2; PGS2 is connected to the input shaft rear bearing 3; the transmission structure includes an active bevel gear 201 and a driven bevel gear 202; the active bevel gear 201 is connected to PGS2; the driven bevel gear 202 is connected to the two-shaft assembly.

[0050] PGS2 is a planetary gear set; it consists of a central gear (sun gear), one or more planetary gears and an outer ring gear (ring gear); PGS2 is used to change the transmission ratio to achieve different speed and torque outputs; the input shaft front bearing 1 and the input shaft rear bearing 3 are press-fitted on PGS2; PGS2 is connected to the active bevel gear 201 through a spline; a clutch is welded on PGS2; PGS2 is connected to the input shaft 204; the engine transmits power to the input shaft 204; the input shaft 204 transmits power to PGS2.

[0051] The two-shaft assembly includes a two-shaft front bearing 4 and a two-shaft rear bearing 5 ; the two-shaft front bearing 4 and the two-shaft rear bearing 5 are respectively connected to the driven bevel gear 202 ; a steel belt 203 is provided between the driving bevel gear 201 and the driven bevel gear 202 .

[0052] The second shaft front bearing 4 and the second shaft rear bearing 5 are interference fit on the driven bevel gear 202; the driving bevel gear 201 is connected to the driven bevel gear 202 through a steel belt 203 or a steel chain; and smooth and impact-free gear shifting can be achieved.

[0053] The shifting structure comprises a low-speed driving gear 6 and a high-speed driving gear 7; a shifting assembly 8 is connected to the driven bevel gear 202; and the shifting assembly 8 is connected to the low-speed driving gear 6 and the high-speed driving gear 7 respectively.

[0054] The low gear driving gear 6 and the high gear driving gear 7 are loosely mounted on the driven bevel gear 202; the shift assembly 8 is connected to the driven bevel gear 202 via a spline; the shift assembly 8 is moved by a shift fork to connect to the low gear driving gear 6 and the high gear driving gear 7 respectively, thereby realizing the switching between the low gear and the high gear; the shift assembly 8 is a synchronizer or a dog clutch.

[0055] The intermediate shaft assembly includes an intermediate shaft; the intermediate shaft is respectively provided with a main reduction driving gear 9, an intermediate shaft front bearing 901, an intermediate shaft rear bearing 902, a parking gear, a low-speed driven gear 903 and a high-speed driven gear 904; the low-speed driven gear 903 is meshed with the low-speed driving gear 6; the high-speed driven gear 904 is meshed with the high-speed driving gear 7.

[0056] The intermediate shaft and the main reduction driving gear 9 are an integrated structure; the intermediate shaft front bearing 901 and the intermediate shaft rear bearing 902 are press-fitted on the intermediate shaft; the parking gear, the low-speed driven gear 903, the high-speed driven gear 904 and the PTO active bevel gear 10 are all connected to the intermediate shaft through splines; the parking gear is connected to the parking cable through the parking pawl, thereby realizing the parking operation.

[0057] The four-drive power output structure includes a PTO active bevel gear 10 ; the PTO active bevel gear 10 is arranged on an intermediate shaft; the PTO active bevel gear 10 is connected to a PTO driven bevel gear 101 ; and the PTO driven bevel gear 101 is connected to a PTO output shaft.

[0058] PTO (POWE TAKE OFF, power output device); the PTO active bevel gear 10 transmits power to the PTO driven bevel gear 101; the PTO driven bevel gear 101 transmits power to the PTO output shaft, and the power is output from the PTO output shaft; the PTO output shaft and the bevel gear cooperate to realize the output of power to the front wheel / rear wheel, realizing the four-wheel drive of the vehicle; the PTO output shaft can be respectively arranged at the left end or the right end of the intermediate shaft.

[0059] The output shaft assembly includes a differential 11 ; the differential 11 is respectively connected with a main reduction driven gear 111 , a differential front bearing 112 and a differential rear bearing 113 ; the main reduction driven gear 111 is meshed with the main reduction driving gear 9 .

[0060] The main reduction driven gear 111 is bolted to the differential 11; the front differential bearing 112 and the rear differential bearing 113 are press-fitted onto the differential 11; the main reduction driven gear 111 and the main reduction driving gear 9 are meshed to realize power transmission, and then the power output is realized through the two ends of the differential 11.

[0061] A method for assembling a multi-speed four-wheel drive CVT transmission structure, the method comprising the following steps:

[0062] S1: Connect the input shaft front bearing 1, the input shaft rear bearing 3 and the active bevel gear 201 to PGS2;

[0063] S2: Connect the second shaft front bearing 4, the second shaft rear bearing 5 and the shift assembly 8 to the driven bevel gear 202; the driven bevel gear 202 is connected to the driving bevel gear 201 through the steel belt 203; the shift assembly 8 is connected to the low-speed driving gear 6 and the high-speed driving gear 7 according to the gear position;

[0064] S3: The main reduction driving gear 9, the intermediate shaft front bearing 901, the intermediate shaft rear bearing 902, the parking gear, the low gear driven gear 903, the high gear driven gear 904 and the PTO driving bevel gear 10 are connected to the intermediate shaft respectively; the low gear driven gear 903 is meshed with the low gear driving gear 6; the high gear driven gear 904 is meshed with the high gear driving gear 7; the PTO driving bevel gear 10 is meshed with the PTO driven bevel gear 101;

[0065] S4: Connect the main reduction driven gear 111 , the differential front bearing 112 and the differential rear bearing 113 to the differential 11 respectively; the main reduction driven gear 111 is meshed with the main reduction driving gear 9 .

[0066] S1 can realize the assembly of the input shaft assembly; S2 can realize the assembly of the second shaft assembly; S3 can realize the assembly of the intermediate shaft assembly; S4 can realize the assembly of the output shaft assembly; so that the device can realize flexible switching between low-gear and high-gear, and can meet the different output torque requirements of customers; at the same time, the device can provide the vehicle with four-wheel drive function, while providing strong power, the required space is smaller and the structure is more compact.

[0067] S1 includes:

[0068] S11: The input shaft front bearing 1 and the input shaft rear bearing 3 are press-fitted on PGS2; PGS2 is connected to the active bevel gear 201 through a spline;

[0069] S2 includes:

[0070] S21: The second shaft front bearing 4 and the second shaft rear bearing 5 are press-fitted on the driven bevel gear 202; the low gear driving gear 6 and the high gear driving gear 7 are sleeved on the driven bevel gear 202; the shift assembly 8 is connected to the driven bevel gear 202 through a spline; the shift fork is used to move the shift assembly 8 to connect with the low gear driving gear 6 and the high gear driving gear 7 respectively, so as to realize the switching between low gear and high gear.

[0071] In S11, the front bearing 1 of the input shaft and the rear bearing 3 of the input shaft are both interference fit with PGS2 to achieve a fixed connection; PGS2 is fixedly connected to the active bevel gear 201 through a spline; in S21; according to the required gear position, the shift fork is used to move the isopositioner or the dog clutch to select the combined tooth connection with the low-speed active gear 6 or the high-speed active gear 7 to achieve the gear shifting operation.

[0072] S3 includes:

[0073] S31: The intermediate shaft and the main reduction driving gear 9 are an integrated structure; the intermediate shaft front bearing 901 and the intermediate shaft rear bearing 902 are press-fitted on the intermediate shaft; the parking gear, the low-speed driven gear 903, the high-speed driven gear 904 and the PTO driving bevel gear 10 are all connected to the intermediate shaft through splines; the parking gear is connected to the parking cable through the parking pawl;

[0074] S4 includes:

[0075] S41 : the main reduction driven gear 111 is bolted to the differential 11 ; the differential front bearing 112 and the differential rear bearing 113 are press-fitted onto the differential 11 .

[0076] In S31, the PTO active bevel gear 10 is fixedly connected to the intermediate shaft through a spline, so that the intermediate shaft can drive the PTO active bevel gear 10 to rotate; the PTO driven bevel gear 101 is fixedly connected to the PTO output shaft; the PTO driven bevel gear 101 transmits power to the PTO output shaft; the parking gear is fixedly connected to the intermediate shaft through a spline, and the parking gear is connected to the parking cable through a parking pawl, which can ensure the safe parking of the vehicle in a stationary state.

[0077] The specific workflow of the present invention is as follows:

[0078] Low-speed power transmission route (four-wheel drive): the engine outputs power to the input shaft 204, and the power of the input shaft 204 passes through the clutch, PGS2, the driving bevel gear 201, the steel belt 203, the driven bevel gear 202, the shift assembly 8, the low-speed driving gear 6, the low-speed driven gear 903, the PTO driving bevel gear 10, the PTO driven bevel gear 101, and is finally output from the PTO output shaft.

[0079] Low-speed power transmission route (two-wheel drive): the engine outputs power to the input shaft 204, and the power of the input shaft 204 passes through the clutch, PGS2, the driving bevel gear 201, the steel belt 203, the driven bevel gear 202, the shift assembly 8, the low-speed driving gear 6, the low-speed driven gear 903, the main reduction driving gear 9, the main reduction driven gear 111, and is finally output from the differential 11.

[0080] High-speed power transmission route (four-wheel drive): the engine outputs power to the input shaft 204, and the power of the input shaft 204 passes through the clutch, PGS2, the driving bevel gear 201, the steel belt 203, the driven bevel gear 202, the shift assembly 8, the high-speed driving gear 7, the high-speed driven gear 904, the PTO driving bevel gear 10, the PTO driven bevel gear 101, and is finally output from the PTO output shaft.

[0081] High-speed power transmission route (two-wheel drive): the engine outputs power to the input shaft 204, and the power of the input shaft 204 passes through the clutch, PGS2, the driving bevel gear 201, the steel belt 203, the driven bevel gear 202, the shift assembly 8, the high-speed driving gear 7, the high-speed driven gear 904, the main reduction driving gear 9, the main reduction driven gear 111, and is finally output from the differential 11.

[0082] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A multi-speed four-wheel drive CVT transmission structure, characterized in that: It includes an input shaft assembly, a second shaft assembly, an intermediate shaft assembly and an output shaft assembly; a transmission structure is provided between the input shaft assembly and the second shaft assembly; a shift structure is provided on the second shaft assembly; the shift structure is connected to the intermediate shaft assembly; the intermediate shaft assembly is connected to the output shaft assembly and is provided with a four-drive force output structure.

2. A multi-speed four-wheel drive CVT transmission structure according to claim 1, characterized in that: The input shaft assembly comprises an input shaft front bearing (1); the input shaft front bearing (1) is connected to a PGS (2); the PGS (2) is connected to an input shaft rear bearing (3); the transmission structure comprises a driving bevel gear (201) and a driven bevel gear (202); the driving bevel gear (201) is connected to the PGS (2); and the driven bevel gear (202) is connected to the two-shaft assembly.

3. A multi-speed four-wheel drive CVT transmission structure according to claim 2, characterized in that: The two-shaft assembly comprises a two-shaft front bearing (4) and a two-shaft rear bearing (5); the two-shaft front bearing (4) and the two-shaft rear bearing (5) are respectively connected to the driven bevel gear (202); and a steel belt (203) is provided between the driving bevel gear (201) and the driven bevel gear (202).

4. A multi-speed four-wheel drive CVT transmission structure according to claim 3, characterized in that: The shifting structure comprises a low-speed driving gear (6) and a high-speed driving gear (7); a shifting assembly (8) is connected to the driven bevel gear (202); and the shifting assembly (8) is respectively connected to the low-speed driving gear (6) and the high-speed driving gear (7).

5. A multi-speed four-wheel drive CVT transmission structure according to claim 4, characterized in that: The intermediate shaft assembly comprises an intermediate shaft; the intermediate shaft is respectively provided with a main reduction driving gear (9), an intermediate shaft front bearing (901), an intermediate shaft rear bearing (902), a parking gear, a low-speed driven gear (903) and a high-speed driven gear (904); the low-speed driven gear (903) is meshed with the low-speed driving gear (6); the high-speed driven gear (904) is meshed with the high-speed driving gear (7).

6. A multi-speed four-wheel drive CVT transmission structure according to claim 5, characterized in that: The four-drive force output structure comprises a PTO active bevel gear (10); the PTO active bevel gear (10) is arranged on the intermediate shaft; the PTO active bevel gear (10) is connected to a PTO driven bevel gear (101); and the PTO driven bevel gear (101) is connected to a PTO output shaft.

7. A multi-speed four-wheel drive CVT transmission structure according to any one of claims 5 to 6, characterized in that: The output shaft assembly comprises a differential (11); the differential (11) is respectively connected with a main reduction driven gear (111), a differential front bearing (112) and a differential rear bearing (113); the main reduction driven gear (111) is meshed with the main reduction driving gear (9).

8. An assembly method of the multi-speed four-wheel drive CVT transmission structure according to any one of claims 1 to 7, characterized in that: The assembly method comprises the following steps: S1: Connect the input shaft front bearing (1), the input shaft rear bearing (3) and the driving bevel gear (201) to PGS (2); S2: The front bearings (4) of the second shaft, the rear bearings (5) of the second shaft and the shift assembly (8) are all connected to the driven bevel gear (202); the driven bevel gear (202) is connected to the driving bevel gear (201) via a steel belt (203); the shift assembly (8) is respectively connected to the low-speed driving gear (6) and the high-speed driving gear (7) according to the gear position; S3: The main reduction driving gear (9), the intermediate shaft front bearing (901), the intermediate shaft rear bearing (902), the parking gear, the low-speed driven gear (903), the high-speed driven gear (904) and the PTO driving bevel gear (10) are respectively connected to the intermediate shaft; the low-speed driven gear (903) is meshed with the low-speed driving gear (6); the high-speed driven gear (904) is meshed with the high-speed driving gear (7); the PTO driving bevel gear (10) is meshed with the PTO driven bevel gear (101); S4: Connecting the main reduction driven gear (111), the differential front bearing (112) and the differential rear bearing (113) to the differential (11) respectively; the main reduction driven gear (111) is meshed with the main reduction driving gear (9).

9. The assembly method according to claim 8, characterized in that: The S1 includes: S11: the input shaft front bearing (1) and the input shaft rear bearing (3) are interference-fitted on the PGS (2); the PGS (2) is connected to the active bevel gear (201) via a spline; The S2 includes: S21: The two-shaft front bearing (4) and the two-shaft rear bearing (5) are press-fitted onto the driven bevel gear (202); the low-speed driving gear (6) and the high-speed driving gear (7) are sleeved onto the driven bevel gear (202); the shift assembly (8) is connected to the driven bevel gear (202) via a spline; the shift fork is used to move the shift assembly (8) to be connected to the low-speed driving gear (6) and the high-speed driving gear (7) respectively, thereby realizing the switching between the low gear and the high gear.

10. The assembly method according to claim 9, characterized in that: The S3 includes: S31: The intermediate shaft and the main reduction driving gear (9) are an integrated structure; the intermediate shaft front bearing (901) and the intermediate shaft rear bearing (902) are interference fit on the intermediate shaft; the parking gear, the low gear driven gear (903), the high gear driven gear (904) and the PTO driving bevel gear (10) are all connected to the intermediate shaft through splines; the parking gear is connected to the parking cable through a parking pawl; The S4 includes: S41: The main reduction driven gear (111) is bolted to the differential (11); the differential front bearing (112) and the differential rear bearing (113) are press-fitted onto the differential (11).

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