48F +48R transmission mechanism

Abstract

The invention belongs to the technical field of vehicle driving, and particularly discloses a 48F + 48R transmission mechanism. The reversing assembly is used for adjusting the advancing direction, the main speed change component is used for graded transmission, the auxiliary speed change assembly is used for adjusting the rotating speed, the common gear assembly is suitable for common conditions, the crawling gear assembly is used for crawling working conditions, and the central transmission assembly is used for transmission to a drive axle. The reversing assembly comprises an input shaft, a shuttle-type gear reversing idle wheel, a shuttle-type gear reversing driving gear and a shuttle-type gear reversing driven gear. The shuttle-type gear reversing driving gear is arranged on the input shaft; the main speed change part comprises a first-stage shaft and a second-stage shaft, and the central transmission assembly is in transmission connection with the second-stage shaft through a bevel gear set; the first-stage shaft and the second-stage shaft are provided with gears, synchronizers and mechanical shifting fork gear sleeves to achieve multi-stage speed change, 48 forward gears and 48 reverse gears are achieved, the flexibility and adaptability of a transmission system are improved, the driving requirements under various complex working conditions are met, and the running efficiency of a vehicle is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle driving, and in particular relates to a 48F+48R transmission mechanism. Background Art

[0002] At present, the gear arrangements of the transmission systems of various large and medium-power tractors produced domestically are generally 24F+8R, 24F+24R, 28F+28R, and at most 32F+32R. The speed arrangement cannot meet the user's operating needs very well, and there are shortcomings such as incomplete coverage of operating conditions and low operating efficiency. Summary of the invention

[0003] In view of the problems of the prior art, a 48F+48R transmission mechanism is proposed. The present invention provides the following technical solutions:

[0004] A 48F+48R transmission mechanism, comprising in sequence a reversing assembly for adjusting the forward direction, a main transmission component for graded transmission, an auxiliary transmission component for adjusting the rotation speed, a normal gear component for general use, a crawler gear component for crawling conditions, and a central transmission component for transmitting to a drive axle;

[0005] The reversing assembly includes an input shaft and a shuttle gear reversing idler wheel, a shuttle gear reversing driving gear and a shuttle gear reversing driven gear; the shuttle gear reversing driving gear is arranged on the input shaft; the main speed change component includes a primary shaft and a secondary shaft, and the central transmission assembly is connected to the secondary shaft through a bevel gear set; the primary shaft is provided with a main speed I gear driving gear, a main speed II gear driving gear, a main speed III gear driving gear, a main speed IV gear driving gear, a main speed V gear driving gear, and a main speed VI gear driving gear; the shuttle gear reversing driven gear is arranged at the end of the secondary shaft, and the secondary shaft is provided with a main speed I gear driven gear, a main speed II gear driven gear, a main speed III gear driven gear, a main speed IV gear driven gear, a main speed V gear driven gear, and a main speed VI gear driven gear corresponding to the primary shaft;

[0006] The auxiliary transmission assembly includes an auxiliary transmission A gear driving gear, an auxiliary transmission B gear driving gear, an auxiliary transmission C gear driving gear and an auxiliary transmission D gear driving gear arranged on the primary shaft, and an auxiliary transmission A gear driven gear, an auxiliary transmission B gear driven gear, an auxiliary transmission C gear driven gear and an auxiliary transmission D gear driven gear correspondingly arranged on the secondary shaft;

[0007] The common gear assembly comprises a common gear driving gear arranged on the primary shaft and a common gear driven gear correspondingly arranged on the secondary shaft;

[0008] The crawler gear assembly comprises a crawler gear driving gear arranged on the primary shaft and a crawler gear driven gear correspondingly arranged on the secondary shaft;

[0009] Among them, a forward and reverse clutch is arranged between the shuttle gear reversing driving gear and the speed gear I driven gear; a synchronizer is arranged between the speed gear I driven gear and the main speed gear II driven gear, between the main speed gear III driven gear and the main speed gear IV driven gear, between the main speed gear V driving gear and the main speed gear VI driving gear, between the auxiliary speed gear A driven gear and the auxiliary speed gear B driven gear, between the auxiliary speed gear C driven gear and the auxiliary speed gear D driven gear, and between the ordinary gear driven gear and the creeping gear driven gear.

[0010] Preferably, the main speed II gear driving gear, the main speed I gear driving gear, the main speed IV gear driving gear, the main speed III gear driving gear, the main speed VI gear driving gear, and the main speed V gear driving gear on the primary shaft are arranged in sequence from the input end to the output end; the main speed II gear driven gear, the main speed I gear driven gear, the main speed IV gear driven gear, the main speed III gear driven gear, the main speed VI gear driven gear, and the main speed V gear driven gear on the secondary shaft are arranged in sequence from the input end to the output end.

[0011] Preferably, the central transmission assembly includes a rear axle drive shaft, a brake, a differential, a bevel gear set for connecting the rear axle drive shaft and the secondary shaft, and a planetary gear set for connecting the rear axle, and the brake and the differential are arranged on the rear axle drive shaft.

[0012] Preferably, the bevel gear set includes a central transmission pinion bevel gear and a central transmission large bevel gear, the central transmission pinion bevel gear is connected to the secondary shaft, and the central transmission large bevel gear is connected to the rear axle transmission shaft.

[0013] Preferably, the planetary gear set includes a final drive sun gear, a final drive planetary carrier, a final drive planetary gear and a final drive ring gear, the final drive sun gear is connected to the rear axle drive shaft, the final drive planetary carrier is connected to the rear axle, and the final drive planetary gear is mounted on the final drive planetary carrier and meshes with the final drive sun gear.

[0014] Preferably, it also includes a power take-off assembly, which includes a primary power take-off shaft and a power release clutch for connecting to the primary shaft.

[0015] Preferably, the power take-off assembly also includes a secondary power take-off shaft, on which a PTO driving gear I and a PTO driving gear II are provided, and on which a PT0 driven gear I and a PT0 driven gear II are correspondingly provided, and a synchronizer is provided between the PT0 driven gear I and the PT0 driven gear II.

[0016] Preferably, the power disengagement clutch and the forward and reverse clutch are wet clutches.

[0017] Preferably, it also includes a transfer case transmission assembly, which includes a transfer case four-wheel drive driving gear and a transfer case four-wheel drive driven gear for providing output, and a transfer case intermediate idler gear is connected between the transfer case four-wheel drive gear and the transfer case four-wheel drive driven gear.

[0018] Preferably, it also includes a gear pump transmission assembly, which includes a gear pump driven gear and a gear pump driving gear arranged on the primary shaft, and a gear pump intermediate idler gear is arranged between the gear pump driving gear and the gear pump driven gear.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By setting the reversing assembly, main transmission component, auxiliary transmission assembly, normal gear assembly, crawler gear assembly and central transmission assembly, the front 48-speed and reverse 48-speed shifting functions are realized, which broadens the speed range, improves the flexibility and adaptability of the transmission system, and can meet the driving needs under various complex working conditions;

[0021] 2. By setting forward and reverse clutches and synchronizers, the smoothness and reliability of the gear shifting process are ensured, and the stability and safety of the transmission system are improved;

[0022] 3. By setting up the transfer case transmission assembly and the gear pump transmission assembly, the switching of the four-wheel drive mode and the power transmission of the gear pump are realized, which improves the off-road performance and passability of the vehicle and significantly improves the operating efficiency and performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the transmission structure of the present invention;

[0024] In the attached drawings, 1, shuttle gear reversing driving gear; 2, main speed II gear driving gear; 3, shuttle gear reversing idler; 4, shuttle gear reversing driven gear; 5, main speed II gear driven gear; 6, main speed I gear driving gear; 7, main speed IV gear driving gear; 8, main speed III gear driving gear; 9, main speed VI gear driving gear; 10, main speed V gear driving gear; 11, main speed I gear driven gear; 12, main speed IV gear driven gear; 13, main speed III gear driven gear; 14. Main speed gear VI driven gear; 15. Main speed gear V driven gear; 16. Auxiliary speed gear D driven gear; 17. Auxiliary speed gear D driving gear; 18. Auxiliary speed gear C driving gear; 19. Auxiliary speed gear B driving gear; 20. Auxiliary speed gear A driving gear; 21. Auxiliary speed gear C driven gear; 22. Auxiliary speed gear B driven gear; 23. Auxiliary speed gear A driven gear; 24. Normal gear driven gear; 25. Normal gear driving gear; 26. Creeper gear driving gear; 27. Crawl gear driven gear; 28. Transfer case four-wheel drive driving gear; 29. ​​Transfer case intermediate idler; 30. Transfer case four-wheel drive driven gear; 31. Gear pump driving gear; 32. Gear pump intermediate idler; 33. Gear pump driven gear; 34. Central transmission small bevel gear; 35. Central transmission large bevel gear; 36. Final transmission sun gear; 37. Final transmission planetary gear; 38. Final transmission ring gear; 39. PTO driving gear Ⅰ; 40. PTO driving gear Ⅱ ; 41. PT0 driven gear Ⅰ; 42. PT0 driven gear Ⅱ; 43. Final drive planetary carrier; 44. Forward and reverse clutch; 45. Differential lock clutch; 46. Power disengagement clutch; 47. Input shaft; 48. Primary shaft; 49. Secondary shaft; 50. Rear axle drive shaft; 51. Synchronizer; 52. Differential; 53. Brake; 54. Mechanical shift fork gear sleeve Ⅰ; 55. Mechanical shift fork gear sleeve Ⅱ; 56. Mechanical shift fork gear sleeve Ⅲ; 57. Mechanical shift fork gear sleeve Ⅵ. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. The directional words mentioned in the following embodiments, such as "up", "down", "left" and "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0026] Glossary:

[0027] PTO: Power Take Off (PTO).

[0028] like Figure 1As shown, a 48F+48R transmission mechanism includes, in sequence, a reversing assembly for adjusting the forward direction, a main transmission component for graded transmission, an auxiliary transmission component for adjusting the rotation speed, a normal gear component for ordinary conditions, a crawler gear component for crawling conditions, and a central transmission component for transmitting to the drive axle;

[0029] The reversing assembly includes an input shaft 47 and a shuttle gear reversing idler wheel 3, a shuttle gear reversing driving gear 1 and a shuttle gear reversing driven gear 4; the shuttle gear reversing driving gear 1 is arranged on the input shaft 47; the main speed change component includes a primary shaft 48 and a secondary shaft 49, and the central transmission assembly is connected to the secondary shaft 49 through a bevel gear set; specifically, the primary shaft 48 is coaxially arranged with the transmission shaft, and the secondary shaft 49 is arranged parallel to the primary shaft 48; the primary shaft 48 is provided with a main speed I gear driving gear 6 and a main speed II gear driving gear The secondary shaft 49 is provided with a main speed gear Ⅰ driven gear 11, a main speed gear Ⅱ driven gear 5, a main speed gear Ⅲ driven gear 13, a main speed gear Ⅳ driven gear 12, a main speed gear Ⅴ driven gear 15, and a main speed gear Ⅵ driven gear 14. The shuttle gear reversing driven gear 4 is arranged at the end of the secondary shaft 49. The secondary shaft 49 is provided with a main speed gear Ⅰ driven gear 11, a main speed gear Ⅱ driven gear 5, a main speed gear Ⅲ driven gear 13, a main speed gear Ⅳ driven gear 12, a main speed gear Ⅴ driven gear 15, and a main speed gear Ⅵ driven gear 14 corresponding to the primary shaft 48. Through different gear combinations, a multi-stage speed change function is realized.

[0030] The auxiliary transmission assembly includes an auxiliary transmission A gear driving gear 20, an auxiliary transmission B gear driving gear 19, an auxiliary transmission C gear driving gear 18 and an auxiliary transmission D gear driving gear 17 arranged on the primary shaft 48, and an auxiliary transmission A gear driven gear 23, an auxiliary transmission B gear driven gear 22, an auxiliary transmission C gear driven gear 21 and an auxiliary transmission D gear driven gear 16 correspondingly arranged on the secondary shaft 49, further widening the speed range and improving the flexibility of the transmission system;

[0031] The normal gear assembly includes a normal gear driving gear 25 arranged on the primary shaft 48 and a normal gear driven gear 24 correspondingly arranged on the secondary shaft 49, which is suitable for normal driving conditions and ensures the normal operation of the vehicle;

[0032] The crawler gear assembly includes a crawler gear driving gear 26 arranged on the primary shaft 48 and a crawler gear driven gear 27 correspondingly arranged on the secondary shaft 49, which is suitable for low-speed and high-torque crawling conditions, thereby improving the vehicle's passability;

[0033] Among them, a forward and reverse clutch 44 is arranged between the shuttle gear reversing driving gear 1 and the speed gear I driven gear; a synchronizer 51 is arranged between the speed gear I driven gear and the main speed gear II driven gear 5, between the main speed gear III driven gear 13 and the main speed gear IV driven gear 12, between the main speed gear V driving gear 10 and the main speed gear VI driving gear 9, between the auxiliary speed gear A driven gear 23 and the auxiliary speed gear B driven gear 22, between the auxiliary speed gear C driven gear 21 and the auxiliary speed gear D driven gear 16, and between the normal gear driven gear 24 and the crawling gear driven gear 27, thereby ensuring the stability and reliability of the gear shifting process.

[0034] Specifically, on the primary shaft 48, the main speed II gear driving gear 2, the main speed I gear driving gear 6, the main speed IV gear driving gear 7, the main speed III gear driving gear 8, the main speed VI gear driving gear 9, and the main speed V gear driving gear 10 are arranged in sequence from the input end to the output end; on the secondary shaft 49, the main speed II gear driven gear 5, the main speed I gear driven gear 11, the main speed IV gear driven gear 12, the main speed III gear driven gear 13, the main speed VI gear driven gear 14, and the main speed V gear driven gear 15 are arranged in sequence from the input end to the output end, and the structural layout is reasonable, which is convenient for maintenance.

[0035] Specifically, the central transmission assembly includes a rear axle drive shaft 50, a brake 53, a differential 52, a bevel gear set for connecting the rear axle drive shaft 50 and the secondary shaft 49, and a planetary gear set for connecting the rear axle. The brake 53 and the differential 52 are arranged on the rear axle drive shaft 50, and the differential 52 is provided with a differential lock clutch 45, which improves the driving stability and safety of the vehicle.

[0036] Specifically, the bevel gear set includes a central transmission small bevel gear 34 and a central transmission large bevel gear 35. The central transmission small bevel gear 34 is connected to the secondary shaft 49, and the central transmission large bevel gear 35 is connected to the rear axle transmission shaft 50 to effectively transmit and convert power.

[0037] Specifically, the planetary gear set includes a final drive sun gear 36, a final drive planetary carrier 43, a final drive planetary gear 37 and a final drive ring gear 38. The final drive sun gear 36 is connected to the rear axle drive shaft 50, the final drive planetary carrier 43 is connected to the rear axle, and the final drive planetary gear 37 is installed on the final drive planetary carrier 43 and meshes with the final drive sun gear 36.

[0038] Furthermore, it also includes a power take-off assembly, which includes a primary power take-off shaft and a power release clutch 46 for connecting to the primary shaft 48, so as to conveniently realize power output and conversion.

[0039] Furthermore, the power take-off assembly also includes a secondary power take-off shaft, on which a PTO driving gear I39 and a PTO driving gear II40 are provided, and on which a PT0 driven gear I41 and a PT0 driven gear II42 are correspondingly provided, a synchronizer 51 is provided between the PT0 driven gear I41 and the PT0 driven gear II42, and the engagement or disengagement with the PT0 driven gear I41 or the PT0 driven gear II42 is controlled by a mechanical shift fork gear sleeve VI57, and different power take-off outputs can be selected according to needs, thereby improving the versatility of the transmission system.

[0040] Preferably, the power disengagement clutch 46 and the forward and reverse clutch 44 are wet clutches, which have good heat dissipation performance and durability, thereby improving the reliability and service life of the transmission system.

[0041] Furthermore, it also includes a transfer case transmission assembly, which includes a transfer case four-wheel drive driving gear 28 and a transfer case four-wheel drive driven gear 30 for providing output, and a transfer case intermediate idler gear 29 is connected between the transfer case four-wheel drive driving gear 28 and the transfer case four-wheel drive driven gear 30, which can realize the switching of the four-wheel drive mode and improve the off-road performance and passability of the vehicle.

[0042] Furthermore, it also includes a gear pump transmission assembly, which includes a gear pump driven gear 33 and a gear pump driving gear 31 arranged on the primary shaft 48, and a gear pump intermediate idler gear 32 is arranged between the gear pump driving gear 31 and the gear pump driven gear 33.

[0043] It has achieved 48 forward gears and 48 reverse gears, which significantly improves the flexibility and adaptability of the transmission system, can meet the driving needs under a variety of complex working conditions, and improves the vehicle's operating efficiency and performance.

[0044] Specifically, the gears include:

[0045] Forward gear / direct gear:

[0046] (1) Forward gear A1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear A driven gear 23, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0047] (2) Forward gear A2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear A driven gear 23, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0048] (3) Forward gear A3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear A driven gear 23, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0049] (4) Forward gear A4: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 54, mesh with the mechanical shift fork gear sleeve II 55 and the auxiliary speed gear A driven gear 23, and mesh with the mechanical shift fork gear sleeve III 56 and the secondary shaft 49. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0050] (5) Forward gear A5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear A driven gear 23, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0051] (6) Forward gear A6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed A gear driven gear 23, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0052] (7) Forward gear B1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear B driven gear 22, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0053] (8) Forward gear B2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear B driven gear 22, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0054] (9) Forward gear B3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear B driven gear 22, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0055] (10) Forward gear B4: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 54, mesh with the mechanical shift fork gear sleeve II 55 and the auxiliary speed gear B driven gear 22, and mesh with the mechanical shift fork gear sleeve III 56 and the secondary shaft 49. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0056] (11) Forward gear B5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear B driven gear 22, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0057] (12) Forward gear B6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed B gear driven gear 22, and mesh the mechanical shift fork gear sleeve III 56 with the secondary shaft 49. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0058] (13) Forward gear C1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0059] (14) Forward gear C2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0060] (15) Forward gear C3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear III driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0061] (16) Forward gear C4: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear IV driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0062] (17) Forward gear C5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed gear C driven gear 21, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0063] (18) Forward gear C6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0064] (19) Forward gear D1: Operate the shift mechanism to make the synchronizer 51 mesh with the main transmission gear I driven gear 11, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main transmission gear I driving gear 6 → main transmission gear I driven gear 11 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0065] (20) Forward gear D2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0066] (21) Forward gear D3: Operate the shift mechanism to make the synchronizer 51 mesh with the main transmission gear III driven gear 13, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main transmission gear III driving gear 8 → main transmission gear III driven gear 13 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0067] (22) Forward gear D4: Operate the shift mechanism to make the synchronizer 51 mesh with the main transmission gear IV driven gear 12, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main transmission gear IV driving gear 7 → main transmission gear IV driven gear 12 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0068] (23) Forward gear D5: Operate the shift mechanism to make the synchronizer 51 mesh with the main gear V gear driving gear 10, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main gear V gear driving gear 10 → main gear V gear driven gear 15 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0069] (24) Forward gear D6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, and the mechanical shift fork gear sleeve III 56 mesh with the secondary shaft 49. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0070] 2. Forward gear / crawler gear:

[0071] (25) Forward gear A1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, the mechanical shift fork gear sleeve I 54 disengage, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed gear A driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0072] (26) Forward gear A2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear A driven gear 23, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0073] (27) Forward gear A3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the main speed gear III driven gear 13, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary gear D gear driven gear 16 → auxiliary gear D gear driving gear 17 → auxiliary gear A gear driving gear 20 → auxiliary gear A gear driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0074] (28) Forward gear A4: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear A driven gear 23, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the mechanical shift fork gear sleeve III 56 and the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0075] (29) Forward gear A5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear A driven gear 23, mesh with the normal gear driven gear 24, and mesh with the normal gear driving gear 25. The mechanical shift fork gear sleeve III 56 meshes with the crawler gear driven gear 27. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear A driving gear 20 → auxiliary speed gear A driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0076] (30) Forward gear A6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed A gear driven gear 23, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0077] (31) Forward gear B1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, the mechanical shift fork gear sleeve I 54 disengage, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed gear B driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0078] (32) Forward gear B2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed gear B driven gear 22, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the crawler gear driven gear 27. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0079] (33) Forward gear B3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear III driven gear 13, the mechanical shift fork gear sleeve I 54 disengage, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed gear B driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0080] (34) Forward gear B4: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear IV driven gear 12, the mechanical shift fork gear sleeve I 54 disengage, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed gear B driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0081] (35) Forward gear B5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear B driven gear 22, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear B driving gear 19 → auxiliary speed gear B driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0082] (36) Forward gear B6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 54, mesh the mechanical shift fork gear sleeve II 55 with the auxiliary speed B gear driven gear 22, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0083] (37) Forward gear C1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear C driven gear 21, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0084] (38) Forward gear C2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear C driven gear 21, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the mechanical shift fork gear sleeve III 56 and the crawler gear driven gear 27. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0085] (39) Forward gear C3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear III driven gear 13, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear C driven gear 21, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0086] (40) Forward gear C4: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear IV driven gear 12, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear C driven gear 21, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear IV driving gear 7 → main speed gear IV driven gear 12 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0087] (41) Forward gear C5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed gear C driven gear 21, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the mechanical shift fork gear sleeve III 56 and the crawler gear driven gear 27. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → auxiliary speed gear D driven gear 16 → auxiliary speed gear D driving gear 17 → auxiliary speed gear C driving gear 18 → auxiliary speed gear C driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0088] (42) Forward gear C6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, disengage the mechanical shift fork gear sleeve I 54, mesh with the auxiliary speed C gear driven gear 21, mesh with the normal gear driven gear 24 and the normal gear driving gear 25, and mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0089] (43) Forward gear D1: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear I driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear I driving gear 6 → main speed gear I driven gear 11 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0090] (44) Forward gear D2: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear II driven gear 5, the mechanical shift fork gear sleeve I 54 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear II driving gear 2 → main speed gear II driven gear 5 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0091] (45) Forward gear D3: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear III driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear III driving gear 8 → main speed gear III driven gear 13 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0092] (46) Forward gear D4: Operate the shift mechanism to make the synchronizer 51 mesh with the main transmission gear IV driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main transmission gear IV driving gear 7 → main transmission gear IV driven gear 12 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0093] (47) Forward gear D5: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed gear V driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed gear V driving gear 10 → main speed gear V driven gear 15 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0094] (48) Forward gear D6: Operate the shift mechanism to make the synchronizer 51 mesh with the main speed VI gear driving gear 9, the mechanical shift fork gear sleeve I 54 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0095] 3. Reverse gear / direct gear:

[0096] (49) Reverse gear A1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed I gear driving gear 6→main speed I gear driven gear 11→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0097] (50) Reverse gear A2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed A gear driving gear 20 → auxiliary speed A gear driven gear 23 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0098] (51) Reverse gear A3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed III gear driving gear 8→main speed III gear driven gear 13→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0099] (52) Reverse gear A4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23. The transmission route at this time is: the shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed IV gear driving gear 7→main speed IV gear driven gear 12→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0100] (53) Reverse gear A5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23. The transmission route at this time is: the shuttle gear reversing driving gear Wheel 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed V gear driving gear 10→main speed V gear driven gear 15→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0101] (54) Reverse gear A6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23. The transmission route at this time is: the shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed VI gear driving gear 9→main speed VI gear driven gear 14→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0102] (55) Reverse gear B1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed I gear driving gear 6→main speed I gear driven gear 11→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed B gear driving gear 19→auxiliary speed B gear driven gear 22→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0103] (56) Reverse gear B2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed B gear driving gear 19 → auxiliary speed B gear driven gear 22 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0104] (57) Reverse gear B3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed III gear driving gear 8→main speed III gear driven gear 13→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed B gear driving gear 19→auxiliary speed B gear driven gear 22→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0105] (58) Reverse gear B4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed IV gear driving gear 7→main speed IV gear driven gear 12→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed B gear driving gear 19→auxiliary speed B gear driven gear 22→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0106] (59) Reverse gear B5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22. The transmission route at this time is: the shuttle gear reversing driving gear Wheel 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed V gear driving gear 10→main speed V gear driven gear 15→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed B gear driving gear 19→auxiliary speed B gear driven gear 22→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0107] (60) Reverse gear B6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22. The transmission route at this time is: the shuttle gear reversing driving gear Wheel 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed VI gear driving gear 9→main speed VI gear driven gear 14→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed B gear driving gear 19→auxiliary speed B gear driven gear 22→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0108] (61) Reverse gear C1: Operate the shift mechanism to make the shuttle gear shift driving gear 1 mesh with the shuttle gear shift driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: shuttle gear shift driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed I gear driving gear 6→main speed I gear driven gear 11→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed C gear driving gear 18→auxiliary speed C gear driven gear 21→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0109] (62) Reverse gear C2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I54 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → auxiliary speed D gear driven gear 16 → auxiliary speed D gear driving gear 17 → auxiliary speed C gear driving gear 18 → auxiliary speed C gear driven gear 21 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0110] (63) Reverse gear C3: Operate the shift mechanism to make the shuttle gear shift driving gear 1 mesh with the shuttle gear shift driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: shuttle gear shift driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed III gear driving gear 8→main speed III gear driven gear 13→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed C gear driving gear 18→auxiliary speed C gear driven gear 21→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0111] (64) Reverse gear C4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: shuttle gear reversing driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed IV gear driving gear 7→main speed IV gear driven gear 12→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed C gear driving gear 18→auxiliary speed C gear driven gear 21→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0112] (65) Reverse gear C5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: the shuttle gear reversing driving gear Wheel 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed V gear driving gear 10→main speed V gear driven gear 15→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed C gear driving gear 18→auxiliary speed C gear driven gear 21→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0113] (66) Reverse gear C6: Operate the shift mechanism to make the shuttle gear shift driving gear 1 mesh with the shuttle gear shift driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, and the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21. The transmission route at this time is: shuttle gear shift driving gear 1 Gear 1→shuttle gear reversing driven gear 4→main speed II gear driven gear 5→main speed II gear driving gear 2→main speed VI gear driving gear 9→main speed VI gear driven gear 14→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed C gear driving gear 18→auxiliary speed C gear driven gear 21→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0114] (67) Reverse gear D1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed I gear driven gear 11, and the mechanical shift fork gear sleeve I 54 and the mechanical shift fork gear sleeve II 55 mesh with the secondary shaft 49. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed I gear driving gear 6 → main speed I gear driven gear 11 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0115] (68) Reverse gear D2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the synchronizer 51 mesh with the secondary shaft 49, and the mechanical shift fork gear sleeve I 54 and the mechanical shift fork gear sleeve II 55 mesh with the secondary shaft 49. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0116] (69) Reverse gear D3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, and the synchronizer 51 mesh with the main speed III gear driven gear 13. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed III gear driving gear 8 → main speed III gear driven gear 13 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0117] (70) Reverse gear D4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, and the synchronizer 51 mesh with the main speed IV gear driven gear 12. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed IV gear driving gear 7 → main speed IV gear driven gear 12 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0118] (71) Reverse gear D5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, and the synchronizer 51 mesh with the main speed V gear driving gear 10. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed V gear driving gear 10 → main speed V gear driven gear 15 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0119] (72) Reverse gear D6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, and the synchronizer 51 mesh with the main speed VI gear driving gear 9. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43.

[0120] 4. Reverse gear / crawling gear:

[0121] (73) Reverse gear A1: Operate the shift mechanism to make the shuttle gear shift driving gear 1 mesh with the shuttle gear shift driven gear 4, the main speed gear II driven gear 5 mesh with the main speed gear II driving gear 2, the synchronizer 51 mesh with the main speed gear I driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed gear D driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed gear A driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear shift Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear I driving gear 6→main speed gear I driven gear 11→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear A driving gear 20→auxiliary speed gear A driven gear 23→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0122] (74) Reverse gear A2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0123] (75) Reverse gear A3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear III driving gear 8→main speed gear III driven gear 13→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear A driving gear 20→auxiliary speed gear A driven gear 23→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0124] (76) Reverse gear A4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear IV driving gear 7→main speed gear IV driven gear 12→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear A driving gear 20→auxiliary speed gear A driven gear 23→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0125] (77) Reverse gear A5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Driven gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear V driving gear 10→main speed gear V driven gear 15→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear A driving gear 20→auxiliary speed gear A driven gear 23→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0126] (78) Reverse gear A6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed A gear driven gear 23, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear VI driving gear 9→main speed gear VI driven gear 14→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear A driving gear 20→auxiliary speed gear A driven gear 23→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0127] (79) Reverse gear B1: Operate the shift mechanism to make the shuttle gear shift driving gear 1 mesh with the shuttle gear shift driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear shift Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear I driving gear 6→main speed gear I driven gear 11→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear B driving gear 19→auxiliary speed gear B driven gear 22→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0128] (80) Reverse gear B2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed A gear driving gear 20→auxiliary speed A gear driven gear 23→central transmission small bevel gear 34→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0129] (81) Reverse gear B3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear III driving gear 8→main speed gear III driven gear 13→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear B driving gear 19→auxiliary speed gear B driven gear 22→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0130] (82) Reverse gear B4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear IV driving gear 7→main speed gear IV driven gear 12→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear B driving gear 19→auxiliary speed gear B driven gear 22→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0131] (83) Reverse gear B5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Driven gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear V driving gear 10→main speed gear V driven gear 15→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear B driving gear 19→auxiliary speed gear B driven gear 22→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0132] (84) Reverse gear B6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve II 55 mesh with the auxiliary speed B gear driven gear 22, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Driven gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear VI driving gear 9→main speed gear VI driven gear 14→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear B driving gear 19→auxiliary speed gear B driven gear 22→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0133] (85) Reverse gear C1: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed I gear driven gear 11, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear I driving gear 6→main speed gear I driven gear 11→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear C driving gear 18→auxiliary speed gear C driven gear 21→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0134] (86) Reverse gear C2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the mechanical shift fork gear sleeve I54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I54 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→auxiliary speed D gear driven gear 16→auxiliary speed D gear driving gear 17→auxiliary speed C gear driving gear 18→auxiliary speed C gear driven gear 21→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0135] (87) Reverse gear C3: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed III gear driven gear 13, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear III driving gear 8→main speed gear III driven gear 13→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear C driving gear 18→auxiliary speed gear C driven gear 21→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0136] (88) Reverse gear C4: Operate the shift mechanism to make the shuttle gear shift driving gear 1 mesh with the shuttle gear shift driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear shift Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear IV driving gear 7→main speed gear IV driven gear 12→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear C driving gear 18→auxiliary speed gear C driven gear 21→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0137] (89) Reverse gear C5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 Driven gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear V driving gear 10→main speed gear V driven gear 15→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear C driving gear 18→auxiliary speed gear C driven gear 21→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0138] (90) Reverse gear C6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driven gear 14, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed D gear driven gear 16, the mechanical shift fork gear sleeve I 54 mesh with the auxiliary speed C gear driven gear 21, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing Driving gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear VI driving gear 9→main speed gear VI driven gear 14→auxiliary speed gear D driven gear 16→auxiliary speed gear D driving gear 17→auxiliary speed gear C driving gear 18→auxiliary speed gear C driven gear 21→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→end transmission sun gear 36→end transmission planet carrier 43;

[0139] (91) Reverse gear D1: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, mesh the main speed II gear driven gear 5 with the main speed II gear driving gear 2, mesh the synchronizer 51 with the main speed I gear driven gear 11, mesh the mechanical shift fork gear sleeve I 54 and the mechanical shift fork gear sleeve II 55 with the secondary shaft 49, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed gear II driven gear 5 → main speed gear II driving gear 2 → main speed gear I driving gear 6 → main speed gear I driven gear 11 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0140] (92) Reverse gear D2: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the synchronizer 51 mesh with the secondary shaft 49, the mechanical shift fork gear sleeve I 54 and the mechanical shift fork gear sleeve II 55 mesh with the secondary shaft 49, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0141] (93) Reverse gear D3: Operate the shift mechanism to mesh the shuttle gear reversing driving gear 1 with the shuttle gear reversing driven gear 4, mesh the main speed II gear driven gear 5 with the main speed II gear driving gear 2, mesh the synchronizer 51 with the main speed III gear driven gear 13, mesh the normal gear driven gear 24 with the normal gear driving gear 25, and mesh the mechanical shift fork gear sleeve III 56 with the crawler gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed III gear driving gear 8 → main speed III gear driven gear 13 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planet carrier 43;

[0142] (94) Reverse gear D4: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed IV gear driven gear 12, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed IV gear driving gear 7 → main speed IV gear driven gear 12 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43;

[0143] (95) Reverse gear D5: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed V gear driving gear 10, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the creeper gear driven gear 27. The transmission route at this time is: shuttle gear reversing main gear Driven gear 1→shuttle gear reversing driven gear 4→main speed gear II driven gear 5→main speed gear II driving gear 2→main speed gear V driving gear 10→main speed gear V driven gear 15→normal gear driven gear 24→normal gear driving gear 25→crawler gear driving gear 26→crawler gear driven gear 27→central transmission small bevel gear 34→central transmission large bevel gear 35→final transmission sun gear 36→final transmission planet carrier 43;

[0144] (96) Reverse gear D6: Operate the shift mechanism to make the shuttle gear reversing driving gear 1 mesh with the shuttle gear reversing driven gear 4, the main speed II gear driven gear 5 mesh with the main speed II gear driving gear 2, the synchronizer 51 mesh with the main speed VI gear driving gear 9, the normal gear driven gear 24 mesh with the normal gear driving gear 25, and the mechanical shift fork gear sleeve III 56 mesh with the crawler gear driven gear 27. The transmission route at this time is: shuttle gear reversing driving gear 1 → shuttle gear reversing driven gear 4 → main speed II gear driven gear 5 → main speed II gear driving gear 2 → main speed VI gear driving gear 9 → main speed VI gear driven gear 14 → normal gear driven gear 24 → normal gear driving gear 25 → crawler gear driving gear 26 → crawler gear driven gear 27 → central transmission small bevel gear 34 → central transmission large bevel gear 35 → final transmission sun gear 36 → final transmission planetary carrier 43.

[0145] The simplified transmission route map is shown in the table below:

[0146]

[0147]

[0148]

[0149]

[0150] The shift control method of this scheme adopts wet clutch power reversing, wet clutch controls four-wheel drive, wet clutch controls differential lock, PTO power output wet clutch power switching, PTO high and low gears are mechanical shift fork sleeve shifting, interval working I-VI gears are synchronizer 51 shifting, and the rest are mechanical shift fork sleeve shifting.

Claims

1. A 48F+48R transmission mechanism, characterized in that: It includes, in sequence, a reversing assembly for adjusting the forward direction, a main transmission component for graded transmission, an auxiliary transmission component for adjusting the rotation speed, a normal gear component for ordinary conditions, a crawler gear component for crawling conditions, and a central transmission component for transmitting to the drive axle; The reversing assembly comprises an input shaft (47), a shuttle gear reversing idler wheel (3), a shuttle gear reversing driving gear (1) and a shuttle gear reversing driven gear (4); the shuttle gear reversing driving gear (1) is arranged on the input shaft (47); the main speed change component comprises a primary shaft (48) and a secondary shaft (49), and the central transmission assembly is connected to the secondary shaft (49) through a bevel gear set; the primary shaft (48) is provided with a main speed I gear driving gear (6), a main speed II gear driving gear (2), a main speed III gear driving gear (3) and a main speed III gear driving gear (4). The secondary shaft (49) is provided with a main speed gear (11), a main speed gear (12), a main speed gear (13), a main speed gear (14), a main speed gear (15), and a main speed gear (16); a shuttle gear reversing driven gear (4) is arranged at the end of the secondary shaft (49); and a main speed gear I driven gear (11), a main speed gear II driven gear (5), a main speed gear III driven gear (13), a main speed gear IV driven gear (12), a main speed gear V driven gear (15), and a main speed gear VI driven gear (14) are arranged on the secondary shaft (49) corresponding to the primary shaft (48); The auxiliary speed change assembly comprises an auxiliary speed change A gear driving gear (20), an auxiliary speed change B gear driving gear (19), an auxiliary speed change C gear driving gear (18) and an auxiliary speed change D gear driving gear (17) arranged on a primary shaft (48), and an auxiliary speed change A gear driven gear (23), an auxiliary speed change B gear driven gear (22), an auxiliary speed change C gear driven gear (21) and an auxiliary speed change D gear driven gear (16) correspondingly arranged on a secondary shaft (49); The common gear assembly comprises a common gear driving gear (25) arranged on a primary shaft (48) and a common gear driven gear (24) correspondingly arranged on a secondary shaft (49); The crawler gear assembly comprises a crawler gear driving gear (26) arranged on a primary shaft (48) and a crawler gear driven gear (27) correspondingly arranged on a secondary shaft (49); A forward and reverse clutch (44) is arranged between the shuttle gear shift driving gear (1) and the speed gear I driven gear; a synchronizer (51) is arranged between the speed gear I driven gear and the main speed gear II driven gear (5), between the main speed gear III driven gear (13) and the main speed gear IV driven gear (12), between the main speed gear V driving gear (10) and the main speed gear VI driving gear (9), between the auxiliary speed gear A driven gear (23) and the auxiliary speed gear B driven gear (22), between the auxiliary speed gear C driven gear (21) and the auxiliary speed gear D driven gear (16), and between the normal gear driven gear (24) and the crawler gear driven gear (27).

2. The 48F+48R transmission mechanism according to claim 1, characterized in that: On the primary shaft (48), a main speed II gear driving gear (2), a main speed I gear driving gear (6), a main speed IV gear driving gear (7), a main speed III gear driving gear (8), a main speed VI gear driving gear (9), and a main speed V gear driving gear (10) are arranged in sequence from the input end to the output end; on the secondary shaft (49), a main speed II gear driven gear (5), a main speed I gear driven gear (11), a main speed IV gear driven gear (12), a main speed III gear driven gear (13), a main speed VI gear driven gear (14), and a main speed V gear driven gear (15) are arranged in sequence from the input end to the output end.

3. The 48F+48R transmission mechanism according to claim 1, characterized in that: The central transmission assembly comprises a rear axle transmission shaft (50), a brake (53), a differential (52), a bevel gear set for connecting the rear axle transmission shaft (50) and a secondary shaft (49), and a planetary gear set for connecting the rear axle, wherein the brake (53) and the differential (52) are arranged on the rear axle transmission shaft (50).

4. The 48F+48R transmission mechanism according to claim 3, characterized in that: The bevel gear set comprises a central transmission small bevel gear (34) and a central transmission large bevel gear (35), wherein the central transmission small bevel gear (34) is connected to a secondary shaft (49), and the central transmission large bevel gear (35) is connected to a rear axle transmission shaft (50).

5. The 48F+48R transmission mechanism according to claim 3, characterized in that: The planetary gear set comprises a final drive sun gear (36), a final drive planetary carrier (43), a final drive planetary gear (37) and a final drive ring gear (38); the final drive sun gear (36) is connected to a rear axle drive shaft (50); the final drive planetary carrier (43) is connected to the rear axle; the final drive planetary gear (37) is mounted on the final drive planetary carrier (43) and meshes with the final drive sun gear (36).

6. The 48F+48R transmission mechanism according to claim 1, characterized in that: Also included is a power take-off assembly, which includes a primary power take-off shaft and a power disconnect clutch (46) for connecting to the primary shaft (48).

7. The 48F+48R transmission mechanism according to claim 6, characterized in that: The power take-off assembly also includes a secondary power take-off shaft, on which a PTO driving gear I (39) and a PTO driving gear II (40) are arranged, and on which a PT0 driven gear I (41) and a PT0 driven gear II (42) are correspondingly arranged, and a synchronizer (51) is arranged between the PT0 driven gear I (41) and the PT0 driven gear II (42).

8. The 48F+48R transmission mechanism according to claim 7, characterized in that: The power disengagement clutch (46) and the forward and reverse clutch (44) are wet clutches.

9. The 48F+48R transmission mechanism according to claim 1, characterized in that: The invention also comprises a transfer case transmission assembly, wherein the transfer case transmission assembly comprises a transfer case four-wheel drive driving gear (28) and a transfer case four-wheel drive driven gear (30) for providing output, and a transfer case intermediate idler gear (29) is connected between the transfer case four-wheel drive driving gear (28) and the transfer case four-wheel drive driven gear (30).

10. The 48F+48R transmission mechanism according to claim 1, characterized in that: The invention also comprises a gear pump transmission assembly, wherein the gear pump transmission assembly comprises a gear pump driven gear (33) and a gear pump driving gear (31) arranged on a primary shaft (48), and a gear pump intermediate idler gear (32) is arranged between the gear pump driving gear (31) and the gear pump driven gear (33).

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