Eight-speed power shifting tractor transmission system

Abstract

The utility model provides an eight-speed power gear shifting tractor transmission system, and belongs to the technical field of tractor transmission. The transmission system comprises a main shaft used for transmitting engine power to the interior of the system; the auxiliary shaft I and the auxiliary shaft II are used as supports; the clutch assembly A and the clutch assembly B are fixedly mounted on the countershaft I and the countershaft II respectively; the speed change mechanism assembly is in transmission connection with the main shaft through a rear transmission shaft; the second gear shaft is fixedly installed between the clutch assembly A and the speed change mechanism assembly, and the third gear shaft is fixedly installed between the clutch assembly B and the speed change mechanism assembly; the synchronizing mechanism assembly is jointly mounted on the second gear shaft and the third gear shaft and used for adjusting multiple gears. According to the transmission system, eight-speed power gear shifting can be achieved, the eight power gear shifting gears can completely meet the gear shifting requirements of heavy-load, medium-load and light-load operation, power gear shifting does not need to be interrupted any more, and the working efficiency of the tractor is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of tractor transmission technology, specifically relating to an eight-speed power shift tractor transmission system. Background Technology

[0002] The technological development of tractor shifting systems has evolved from traditional mechanical shifting to power shifting, and then to continuously variable transmissions (CVTs). Despite significant technological advancements, existing systems still have many limitations, especially in complex agricultural scenarios and under high-load operating conditions.

[0003] Modern large-scale agricultural production requires tractors to reduce downtime during processes such as tilling, sowing, and harvesting. Traditional manual shifting requires disengaging the clutch, which interrupts power and reduces operational efficiency. Different soil resistance, slopes, and load changes (such as attaching implements) require tractors to quickly adjust speed and torque.

[0004] The eight-speed power shift technology for tractors is a high-end transmission technology developed to meet the needs of efficient and precise operations in modern agriculture. Its core lies in the coordinated operation of multiple clutches, which eliminates the need to cut off power output during gear shifts, thus ensuring continuous operation and significantly improving efficiency, especially in complex working conditions such as heavy-duty tillage and slope operations. Utility Model Content

[0005] In view of this, this utility model proposes an eight-speed power shift tractor transmission system, which can solve the problems that the existing tractor power transmission system cannot meet the needs of multiple power gears in actual production operations, resulting in low work efficiency and difficulty in operation for drivers.

[0006] The implementation scheme of this utility model is as follows:

[0007] This utility model provides an eight-speed power shift tractor transmission system, wherein the transmission system includes a main shaft for transmitting engine power to the system interior; a first and a second auxiliary shaft for support; a clutch assembly A and a clutch assembly B respectively fixedly mounted on the first and second auxiliary shafts; a transmission mechanism assembly connected to the main shaft via a rear drive shaft; a second gear shaft fixedly mounted between the clutch assembly A and the transmission mechanism assembly; a third gear shaft fixedly mounted between the clutch assembly B and the transmission mechanism assembly; and a synchronization mechanism assembly for adjusting multiple gears, which is jointly mounted on the second and third gear shafts.

[0008] The technical advantages of the eight-speed power shift tractor transmission system provided by this utility model are as follows:

[0009] Within the limited space of the gearbox, a combination of 4 clutches and 8 synchronizers is used to achieve power reversal and 8 power shift gears.

[0010] Based on the above technical solution, the eight-speed power shift tractor transmission system of this utility model can be further improved as follows:

[0011] Furthermore, the clutch assembly A includes a first clutch and a second clutch; both the first clutch and the second clutch are fixedly mounted on the first auxiliary shaft, wherein the second clutch is close to the synchronization mechanism assembly; a #2 gear is fixedly mounted on the first auxiliary shaft on the side of the first clutch away from the second clutch; a #1 gear is fixedly mounted on the first auxiliary shaft on the side of the second gear away from the first clutch.

[0012] Furthermore, the clutch assembly B includes a third clutch and a fourth clutch; both the third clutch and the fourth clutch are fixedly mounted on the second auxiliary shaft, wherein the fourth clutch is close to the synchronization mechanism assembly; a #4 gear is fixedly mounted on the second auxiliary shaft on the side of the third clutch away from the fourth clutch; a #3 gear is fixedly mounted on the second auxiliary shaft on the side of the fourth gear away from the third clutch.

[0013] Furthermore, gears #5, #6, and #7 are sequentially fixedly installed on the main shaft; gears #6 and #7 are a double gear.

[0014] Furthermore, this transmission system also includes a gear shaft, on which an 8# gear is fixedly mounted.

[0015] Furthermore, the meshing relationships of the front gears are as follows: Gear #1 meshes with Gear #5; Gear #5 meshes with Gear #8; Gear #8 meshes with Gear #3.

[0016] The meshing relationship of the intermediate gears is as follows: gear #2 meshes with gear #7; gear #6 meshes with gear #4.

[0017] Furthermore, the synchronization mechanism assembly includes synchronizer #1, synchronizer #2, synchronizer #3, and synchronizer #4; synchronizer #1 and synchronizer #2 are fixedly mounted on gear shaft two; synchronizer #3 and synchronizer #4 are fixedly mounted on gear shaft three.

[0018] Furthermore, gears #9 and #10 are hingedly mounted on the gear shafts on both sides of synchronizer #1; gears #11 and #12 are hingedly mounted on the gear shafts on both sides of synchronizer #2; gears #17 and #18 are hingedly mounted on the gear shafts on both sides of synchronizer #3; and gears #19 and #20 are hingedly mounted on the gear shafts on both sides of synchronizer #4.

[0019] Furthermore, gears #13, #14, #15, and #16 are sequentially fixedly installed on the rear drive shaft.

[0020] Furthermore, the meshing relationship of the rear gears is as follows: gear #9 meshes with gear #13, and gear #13 meshes with gear #17.

[0021] The #10 gear meshes with the #14 gear, and the #14 gear meshes with the #18 gear;

[0022] The 11# gear meshes with the 15# gear, and the 15# gear meshes with the 19# gear;

[0023] The 12# gear meshes with the 16# gear, and the 16# gear meshes with the 20# gear.

[0024] Compared with the prior art, the beneficial effects of the eight-speed power shift tractor transmission system provided by this utility model are:

[0025] This transmission system enables power reversal and eight-speed power shifting. The eight power shifting gears can fully meet the shifting needs of heavy, medium, and light load operations without interrupting power shifting, greatly improving the working efficiency of the tractor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the transmission system;

[0027] Figure 2 This is a schematic diagram of the clutch assembly A.

[0028] Figure 3 This is a schematic diagram of the transmission assembly structure and the position of the main shaft;

[0029] Figure 4 This is a schematic diagram of the clutch assembly B.

[0030] Figure 5 This is a schematic diagram of the synchronization mechanism assembly.

[0031] Figure 6 Diagram showing the positions of each shaft and the meshing of the front gear;

[0032] Figure 7 Diagram showing the positions of each shaft and the meshing of the intermediate gear;

[0033] Figure 8 This diagram shows the positions of each shaft and the meshing of the rear gear.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 11. Main shaft; 111. Gear #5; 112. Gear #6; 113. Gear #7;

[0036] 12. Secondary shaft one; 13. Secondary shaft two;

[0037] 14. Gear shaft one; 141. Gear #8;

[0038] 15. Gear shaft 2; 151. Gear #9; 152. Gear #10; 153. Gear #11; 154. Gear #12;

[0039] 16. Gear shaft three; 161, 17# gears; 162, 18# gears; 163, 19# gears; 164, 20# gears;

[0040] 20. Clutch Assembly A; 21. Clutch No. 1; 22. Clutch No. 2; 23. Gear No. 1; 24. Gear No. 2;

[0041] 30. Clutch assembly B; 31. Clutch No. 3; 32. Clutch No. 4; 33. Gear No. 3; 34. Gear No. 4;

[0042] 40. Transmission mechanism assembly; 41. Rear drive shaft; 411. Gear #13; 412. Gear #14; 413. Gear #15; 414. Gear #16;

[0043] 50. Synchronization mechanism assembly; 51. Synchronizer #1; 52. Synchronizer #2; 53. Synchronizer #3; 54. Synchronizer #4. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0045] like Figure 1As shown, this utility model provides an eight-speed power shift tractor transmission system, wherein the transmission system includes a main shaft 11 for transmitting engine power to the system interior; a first auxiliary shaft 12 and a second auxiliary shaft 13 for support; a clutch assembly A20 and a clutch assembly B30 respectively fixedly mounted on the first auxiliary shaft 12 and the second auxiliary shaft 13; a transmission mechanism assembly 40 connected to the main shaft 11 via a rear drive shaft 41; a second gear shaft 15 fixedly mounted between the clutch assembly A20 and the transmission mechanism assembly 40; a third gear shaft 16 fixedly mounted between the clutch assembly B30 and the transmission mechanism assembly 40; and a synchronization mechanism assembly 50 for adjusting multiple gears, which is jointly mounted on the second gear shaft 15 and the third gear shaft 16.

[0046] Optionally, in the above technical solution, the clutch assembly A20 includes a first clutch 21 and a second clutch 22; both the first clutch 21 and the second clutch 22 are fixedly mounted on the auxiliary shaft 12, wherein the second clutch 22 is close to the synchronization mechanism assembly 50; a #2 gear 24 is fixedly mounted on the auxiliary shaft 12 on the side of the first clutch 21 away from the second clutch 22; a #1 gear 23 is hingedly mounted on the auxiliary shaft 12 on the side of the second gear 24 away from the first clutch 21.

[0047] Optionally, in the above technical solution, the clutch assembly B30 includes a third clutch 31 and a fourth clutch 32; both the third clutch 31 and the fourth clutch 32 are fixedly mounted on the second auxiliary shaft 13, with the fourth clutch 32 being closer to the synchronizing mechanism assembly 50; a fourth gear 34 is fixedly mounted on the second auxiliary shaft 13 on the side of the third clutch 31 away from the fourth clutch 32; a third gear 33 is hingedly mounted on the second auxiliary shaft 13 on the side of the fourth gear 34 away from the third clutch 31.

[0048] Optionally, in the above technical solution, a 5# gear 111, a 6# gear 112, and a 7# gear 113 are also sequentially installed on the main shaft 11; wherein, the 5# gear 111 is fixedly installed on the main shaft 11, and the 6# gear 112 and the 7# gear 113 are hingedly installed on the main shaft; in particular, the 6# gear 112 and the 7# gear 113 are double gears.

[0049] Optionally, in the above technical solution, the transmission system also includes a gear shaft 14, on which an 8# gear 141 is fixedly mounted.

[0050] Optionally, in the above technical solution, the meshing relationship of the front gears is as follows: gear 1#23 meshes with gear 5#111; gear 5#111 meshes with gear 8#141; gear 8#141 meshes with gear 3#33.

[0051] The meshing relationships of the intermediate gears are as follows: Gear #24 meshes with Gear #7113; Gear #6112 meshes with Gear #4134.

[0052] Optionally, in the above technical solution, the synchronization mechanism assembly 50 includes synchronizer 1# 51, synchronizer 2# 52, synchronizer 3# 53 and synchronizer 4# 54; synchronizer 1# 51 and synchronizer 2# 52 are fixedly installed on gear shaft 2 15; synchronizer 3# 53 and synchronizer 4# 54 are fixedly installed on gear shaft 3 16.

[0053] Optionally, in the above technical solution, gears 151 and 152 are hingedly mounted on the gear shafts 15 on both sides of synchronizer 51; gears 153 and 154 are hingedly mounted on the gear shafts 15 on both sides of synchronizer 52; gears 161 and 162 are hingedly mounted on the gear shafts 16 on both sides of synchronizer 53; and gears 163 and 164 are hingedly mounted on the gear shafts 16 on both sides of synchronizer 54.

[0054] Optionally, in the above technical solution, gears 411, 412, 413, and 414 are also fixedly installed on the rear drive shaft 41 in sequence.

[0055] Optionally, in the above technical solution, the meshing relationship of the rear gears is as follows: gear #9 151 meshes with gear #13 411, and gear #13 411 meshes with gear #17 161.

[0056] Gear #10 (152) meshes with gear #14 (412), and gear #14 (412) meshes with gear #18 (162).

[0057] Gear #11 (153) meshes with gear #15 (413), and gear #15 (413) meshes with gear #19 (163).

[0058] Gear #12 (154) meshes with gear #16 (414), and gear #16 (414) meshes with gear #20 (164).

[0059] The transmission mechanism assembly 40 is installed at the rear end of the aforementioned transmission system to achieve other gears. It is a conventional mechanical structure and will not be described in detail further.

[0060] The rear drive shaft 41 is inserted into the transmission mechanism assembly 40 to drive the internal gear system to rotate, and finally drive the tractor to move.

[0061] Specifically, the power transmission path for each gear:

[0062] First gear forward, clutch #1 (21) and clutch #4 (32) engage, synchronizer #4 (54) engages gear #20 (164):

[0063] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A 20 → Gear #2 24 → Gear #7 113 → Gear #6 112 → Gear #4 34 → Clutch assembly B 30 → Clutch #4 32 → Gear shaft three 16 → Synchronizer #4 54 → Gear #20 164 → Gear #16 414 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0064] In forward 2nd gear, clutches 1 (21) and 2 (22) engage, and synchronizer 2 (52) engages gear 12 (154).

[0065] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #2 52 → Gear #12 154 → Gear #16 414 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0066] Forward 3rd gear, clutch #1 (21) and clutch #4 (32) are engaged, synchronizer #4 (54) engages gear #19 (163).

[0067] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A 20 → Gear #2 24 → Gear #7 113 → Gear #6 112 → Gear #4 34 → Clutch assembly B 30 → Clutch #4 32 → Gear shaft three 16 → Synchronizer #4 54 → Gear #19 163 → Gear #15 413 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0068] Forward 4th gear, clutch #1 (21), clutch #2 (22), synchronizer #2 (52), gear #11 (153):

[0069] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #2 52 → Gear #11 153 → Gear #15 413 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0070] 5th gear forward, clutch #1 (21) and clutch #4 (32) engage, synchronizer #3 (53) engages gear #18 (162).

[0071] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A 20 → Gear #2 24 → Gear #7 113 → Gear #6 112 → Gear #4 34 → Clutch assembly B 30 → Clutch #4 32 → Gear shaft three 16 → Synchronizer #3 53 → Gear #18 162 → Gear #14 412 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0072] Forward in 6th gear, clutches 1 (21) and 2 (22) are engaged, synchronizer 1 (51) engages gear 10 (152).

[0073] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #1 51 → Gear #10 512 → Gear #14 412 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0074] 7th gear forward, clutch #1 (21) and clutch #4 (32) engaged, synchronizer #3 (53) engaged with gear #17 (161):

[0075] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A 20 → Gear #2 24 → Gear #7 113 → Gear #6 112 → Gear #4 34 → Clutch assembly B 30 → Clutch #4 32 → Gear shaft three 16 → Synchronizer #3 53 → Gear #17 161 → Gear #13 411 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0076] 8th gear forward, clutch 1 (21) and clutch 22 are engaged, synchronizer 1 (51) engages gear 9 (151):

[0077] Engine power → Main shaft 11 → Gear #5 111 → Gear #1 23 → Clutch #1 21 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #1 51 → Gear #9 151 → Gear #13 411 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0078] Reverse in 1st gear, clutches 31 and 42 engage, synchronizer 54 engages gear 164 (20th gear).

[0079] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Clutch #4 32 → Gear shaft 3 16 → Synchronizer #4 54 → Gear #20 164 → Gear #16 414 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0080] Reverse to 2nd gear, clutch 31 and clutch 22 engage, synchronizer 52 engages gear 12 154:

[0081] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Gear #4 34 → Gear #6 112 → Gear #7 113 → Gear #2 24 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #2 52 → Gear #12 154 → Gear #16 414 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0082] Reverse to 3rd gear, clutch 31 and clutch 42 engage, synchronizer 54 engages gear 19 (163).

[0083] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Clutch #4 32 → Gear shaft 3 16 → Synchronizer #4 54 → Gear #19 163 → Gear #15 413 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0084] Reverse to 4th gear, clutch 31 and clutch 22 engage, synchronizer 52 engages gear 11 (153):

[0085] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Gear #4 34 → Gear #6 112 → Gear #7 113 → Gear #2 24 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #2 52 → Gear #11 153 → Gear #15 413 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0086] Reverse to 5th gear, clutches 31 and 42 engage, synchronizer 53 engages gear 162 (18th gear).

[0087] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Clutch #4 32 → Gear shaft 3 16 → Synchronizer #3 53 → Gear #18 162 → Gear #14 412 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0088] Reverse to 6th gear, clutch 31 and clutch 22 engage, synchronizer 1 engages gear 10 152:

[0089] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Gear #4 34 → Gear #6 112 → Gear #7 113 → Gear #2 24 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #1 51 → Gear #10 152 → Gear #14 412 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0090] Reverse in 7th gear, clutches 31 and 42 engage, synchronizer 53 engages gear 161 (17th gear).

[0091] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Clutch #4 32 → Gear shaft 3 16 → Synchronizer #3 53 → Gear #17 161 → Gear #13 411 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0092] Reverse to 8th gear, clutch 31 and clutch 22 engage, synchronizer 1 engages gear 9151:

[0093] Engine power → Main shaft 11 → Gear #5 111 → Gear #8 141 → Gear #3 33 → Clutch #3 31 → Clutch assembly B30 → Gear #4 34 → Gear #6 112 → Gear #7 113 → Gear #2 24 → Clutch assembly A20 → Clutch #2 22 → Gear shaft 2 15 → Synchronizer #1 51 → Gear #9 151 → Gear #13 411 → Rear drive shaft 41 → Transmission mechanism assembly 40.

[0094] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An eight-speed power-shift tractor driveline, characterized in that, The transmission system comprises a main shaft (11) for transmitting engine power to the inside of the system; a supporting secondary shaft one (12) and a secondary shaft two (13); a clutch assembly A (20) and a clutch assembly B (30) fixedly installed on the secondary shaft one (12) and the secondary shaft two (13) respectively; a gear shifting mechanism assembly (40) in transmission connection with the main shaft (11) through a rear transmission shaft (41); a gear shaft two (15) fixedly installed between the clutch assembly A (20) and the gear shifting mechanism assembly (40), and a gear shaft three (16) fixedly installed between the clutch assembly B (30) and the gear shifting mechanism assembly (40); and a synchronization mechanism assembly (50) for adjusting multiple gears, which is jointly installed on the gear shaft two (15) and the gear shaft three (16).

2. An eight-speed powershift tractor driveline according to claim 1, characterized in that, The clutch assembly A (20) comprises a first clutch (21) and a second clutch (22), both of which are fixedly installed on the secondary shaft one (12), wherein the second clutch (22) is close to the synchronization mechanism assembly (50); and a 2# gear (24) is fixedly installed on the secondary shaft one (12) away from the second clutch (22) side of the first clutch (21); and a 1# gear (23) is hingedly installed on the secondary shaft one (12) away from the first clutch (21) side of the 2# gear (24).

3. An eight-speed powershift tractor driveline according to claim 2, characterized in that, The clutch assembly B (30) comprises a third clutch (31) and a fourth clutch (32), both of which are fixedly installed on the secondary shaft two (13), wherein the fourth clutch (32) is close to the synchronization mechanism assembly (50); and a 4# gear (34) is fixedly installed on the secondary shaft two (13) away from the fourth clutch (32) side of the third clutch (31); and a 3# gear (33) is hingedly installed on the secondary shaft two (13) away from the third clutch (31) side of the 4# gear (34).

4. An eight-speed powershift tractor driveline according to claim 3, characterized in that, A 5# gear (111), a 6# gear (112) and a 7# gear (113) are sequentially installed on the main shaft (11); the 6# gear (112) and the 7# gear (113) are double gears hingedly installed on the main shaft (11).

5. An eight-speed powershift tractor driveline according to claim 4, characterized in that, The transmission system further comprises a gear shaft one (14) on which an 8# gear (141) is installed.

6. An eight-speed powershift tractor driveline according to claim 5, characterized in that, The front end gear engagement relationship is as follows: the 1# gear (23) and the 5# gear (111) are in engagement with each other; the 5# gear (111) and the 8# gear (141) are in engagement with each other; and the 8# gear (141) and the 3# gear (33) are in engagement with each other. The middle end gear engagement relationship is as follows: the 2# gear (24) and the 7# gear (113) are in engagement with each other; and the 6# gear (112) and the 4# gear (34) are in engagement with each other.

7. An eight-speed powershift tractor driveline according to claim 1, characterized in that, The synchronous mechanism assembly (50) includes a 1# synchronizer (51), a 2# synchronizer (52), a 3# synchronizer (53) and a 4# synchronizer (54); the 1# synchronizer (51) and the 2# synchronizer (52) are fixedly installed on the gear shaft two (15); the 3# synchronizer (53) and the 4# synchronizer (54) are fixedly installed on the gear shaft three (16).

8. An eight-speed powershift tractor driveline according to claim 7, characterized in that, The gear shaft two (15) on the two sides of the 1# synchronizer (51) is hingedly installed with a 9# gear (151) and a 10# gear (152); the gear shaft two (15) on the two sides of the 2# synchronizer (52) is hingedly installed with an 11# gear (153) and a 12# gear (154); the gear shaft three (16) on the two sides of the 3# synchronizer (53) is hingedly installed with a 17# gear (161) and an 18# gear (162); the gear shaft three (16) on the two sides of the 4# synchronizer (54) is hingedly installed with a 19# gear (163) and a 20# gear (164).

9. An eight-speed powershift tractor driveline according to claim 8, characterized in that, The rear transmission shaft (41) is further sequentially fixedly installed with a 13# gear (411), a 14# gear (412), a 15# gear (413) and a 16# gear (414).

10. An eight-speed powershift tractor driveline according to claim 9, characterized in that, The rear end gear engagement relationship is as follows: the 9# gear (151) and the 13# gear (411) are mutually engaged, the 13# gear (411) and the 17# gear (161) are mutually engaged; The 10# gear (152) and the 14# gear (412) are mutually engaged, the 14# gear (412) and the 18# gear (162) are mutually engaged; The 11# gear (153) and the 15# gear (413) are mutually engaged, the 15# gear (413) and the 19# gear (163) are mutually engaged; The 12# gear (154) and the 16# gear (414) are mutually engaged, and the 16# gear (414) and the 20# gear (164) are mutually engaged.

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