Front drive axle assembly of hydraulic stepless speed change harvester

Abstract

The utility model belongs to the technical field of agricultural machinery transmission systems, and particularly relates to a front drive axle assembly of a hydraulic stepless speed change harvester, which comprises a gearbox body, a first shaft, a second shaft, a third shaft, a left half shaft and a right half shaft of a differential assembly are rotatably connected in the gearbox body, and the first shaft is in transmission connection with an output end of a hydraulic stepless speed change motor. The first shaft is sleeved with a first shaft gear A, the second shaft is sleeved with a first-stage speed reduction driven gear, the second shaft and the third shaft are in transmission fit through a gear position gear assembly, the third shaft is sleeved with a third shaft gear A, a left half shaft and a right half shaft of the differential mechanism assembly are in transmission connection with the tail end transmission box assembly, and one end of the third shaft extends out of the gearbox body to form a four-wheel drive reserved end. According to the utility model, a transmission mechanism which is driven by the hydraulic stepless variable-speed motor and is provided with multi-gear speed change is adopted, so that the requirements of simple operation and stable and reliable transmission are met, and a four-wheel-drive reserved end which can be in transmission fit with a four-wheel-drive transfer case is reserved, so that the complete machine can be ensured to have enough driving force.

Description

Technical field:

[0001] The utility model belongs to the technical field of agricultural machinery transmission systems, in particular to a front drive axle assembly of a hydraulic stepless speed-changing harvester. Background technology:

[0002] As various agricultural harvesting machines develop towards large-scale, the weight of the whole machine continues to increase. The existing technology uses a large wheat and corn harvester drive axle assembly that uses mechanical clutch input plus gear transmission and is driven only by the front wheel. The operation intensity is high, the clutch friction plate is easy to sinter, and the failure rate is high. The self-propelled harvester driven only by the front wheel has the problem of the drive wheel sinking and slipping when encountering a soft field during harvesting operations. For this reason, there is a need on the market for a front drive axle assembly that meets the conditions of simple operation and stable transmission, and can also reserve a reserved output end that can cooperate with the four-wheel drive transfer assembly according to actual needs to improve the driveability of the whole machine. Summary of the invention:

[0003] The purpose of the utility model is to provide a hydraulic continuously variable speed harvester front drive axle assembly, which is driven by a hydraulic continuously variable speed motor and has a transmission mechanism with multiple gears to meet the requirements of simple operation, stable and reliable transmission, and a four-wheel drive reserved end that can cooperate with the four-wheel drive transfer case transmission is reserved to determine whether to combine with the four-wheel drive according to actual operating requirements, to ensure that the whole machine has sufficient driving force.

[0004] The utility model is achieved in this way:

[0005] A hydraulic continuously variable speed harvester front drive axle assembly includes a gearbox body, in which a first shaft, a second shaft, a third shaft, a left half shaft and a right half shaft of a differential assembly are rotatably connected, one end of the first shaft is transmission-connected to the output end of the hydraulic continuously variable speed motor, a first shaft tooth A is mounted on the first shaft, a primary reduction passive gear meshing with the first shaft tooth A is mounted on the second shaft, the second shaft and the third shaft are transmission-matched via a gear assembly, the third shaft is transmission-matched with the third shaft tooth A meshing with the input teeth of the differential assembly, the left half shaft and the right half shaft of the differential assembly are transmission-connected to the input end of the corresponding side terminal transmission box assembly via a connecting shaft, one end of the three shafts extends out of the gearbox body and is formed with a four-wheel drive reserved end for transmission-matching with the input end of a four-wheel drive transfer case.

[0006] In the above-mentioned hydraulic continuously variable speed harvester front drive axle assembly, the gearbox body is fixedly connected to the hydraulic continuously variable speed motor through a connecting plate, and the output end of the hydraulic continuously variable speed motor and the corresponding end of a shaft are connected through an input spline sleeve.

[0007] In the above-mentioned hydraulic continuously variable speed harvester front drive axle assembly, the gear gear assembly includes a second shaft tooth A, a second shaft tooth B and a third gear driving gear arranged on the second shaft, the third shaft is rotatably sleeved with a first gear passive gear meshing with the second shaft tooth A, and a second gear passive gear meshing with the second shaft tooth B, a second gear hub sleeve is arranged between the first gear passive gear and the second gear passive gear, the first and second gear hub sleeves are engaged with the first gear passive gear or the second gear passive gear to realize the synchronous rotation of the three shafts and the corresponding passive gears, the third gear driving gear is rotatably sleeved on the second shaft and meshed with the third shaft tooth A, the second shaft located on one side of the third gear driving gear is sequentially provided with a third gear hub sleeve and a limit sleeve which cooperates with the third gear driving gear axially to limit the third gear hub sleeve, the third gear hub sleeve is engaged with the third gear driving gear to realize the synchronous rotation of the two shafts and the third gear driving gear.

[0008] In the above-mentioned hydraulic continuously variable speed harvester front drive axle assembly, a first and second gear fork shaft and a third gear fork shaft which can slide axially relative to each other are arranged side by side in the gearbox body, a first and second gear fork shaft is fixedly sleeved with a first and second gear fork which cooperates with the first and second gear gear hub sleeve for transmission, a third gear fork shaft is fixedly sleeved with a third gear fork which cooperates with the third gear gear hub sleeve for transmission, an interlocking pin is arranged between the first and second gear fork shaft and the third gear fork shaft, an interlocking groove for inserting the interlocking pin is arranged on the side wall of the first and second gear fork shaft, an interlocking through hole is arranged on the side wall of the third gear fork shaft, a neutral switch transition pin is arranged in the interlocking through hole, a neutral switch assembly is arranged on the gearbox body, the telescopic end of the neutral switch assembly can be inserted into the interlocking through hole and push the neutral switch transition pin against the interlocking pin until the interlocking pin is inserted into the interlocking groove.

[0009] In the above-mentioned hydraulic continuously variable speed harvester front drive axle assembly, the left half-shaft gear of the differential assembly is fixed circumferentially and slides axially relatively on the differential lock spline shaft. The left end of the differential lock spline shaft rotates synchronously with the left half-shaft circumferentially through the differential lock spline sleeve, and the differential lock spline sleeve and the differential lock spline shaft are axially fixed by a connecting pin. The cross shaft of the differential assembly is provided with an internal spline hole for the differential lock spline shaft to be axially inserted and synchronously rotated circumferentially. The gearbox body is provided with a differential lock fork shaft, and the differential lock fork A differential lock fork is axially slidably connected to the shaft, one end of the differential lock fork is fixedly sleeved on the differential lock spline sleeve, and the other end is provided with a hinge matching groove, one end of the differential lock inner rocker arm slides and is hingedly fitted in the hinge matching groove through an axle pin, and the other end rotates synchronously with the inner end of the linkage shaft rotating on the gearbox body, the outer end of the linkage shaft extends out between the gearbox body and is sleeved with a differential lock outer rocker arm, and a return spring is arranged between the differential lock outer rocker arm and the gearbox body, the elastic force of which can push the differential lock spline shaft to connect and separate with the cross shaft.

[0010] In the above-mentioned hydraulic continuously variable speed harvester front drive axle assembly, a brake disc is provided at the input end of the terminal transmission box assembly, and a brake caliper matching the brake disc is provided on the external frame;

[0011] Or a full - disc brake fixed to the gearbox body is provided on the left half - shaft and the right half - shaft.

[0012] In the above - mentioned front drive axle assembly of a hydrostatic continuously variable transmission harvester, the final drive box assembly includes a final drive box body and a final drive box cover. A fully enclosed cavity is formed between the final drive box body and the final drive box cover. A final input shaft and a final output shaft are rotatably and penetratingly fitted in the fully enclosed cavity. A final input gear A is sleeved on the final input shaft, and a final drive large gear meshing with the final input gear is sleeved on the final output shaft.

[0013] In the above - mentioned front drive axle assembly of a hydrostatic continuously variable transmission harvester, a parking brake assembly fixed to the gearbox body is provided at one end of the three - axis, and the four - wheel drive reserved end is the part of the corresponding end of the three - axis extending outwards from the parking brake assembly.

[0014] In the above - mentioned front drive axle assembly of a hydrostatic continuously variable transmission harvester, a number of spherical holes are circumferentially and evenly distributed on the outer circumferential wall of the four - wheel drive reserved end. Steel balls are arranged in the spherical holes. The four - wheel drive transfer case is fixed on the parking brake assembly, and a grooved hole for the axial insertion of the four - wheel drive reserved end and the steel balls is provided on the end face of the input end of the four - wheel drive transfer case.

[0015] The prominent advantages of the present utility model compared with the prior art are:

[0016] 1. The present utility model is driven by a hydrostatic variable - speed motor and has a transmission mechanism with multiple gears to meet the requirements of simple operation and stable and reliable transmission. A four - wheel drive reserved end capable of being in transmission cooperation with the four - wheel drive transfer case is reserved to determine whether to combine with the four - wheel drive according to the actual operation requirements, ensuring that the whole machine can have sufficient driving force.

[0017] 2. The gear position gear assembly of the present utility model has three gears, the corresponding driving speeds are reasonable, and there is an interlock and neutral - gear switch assembly during gear shifting. The differential lock and the reserved four - wheel drive output connection can be selected according to actual needs to improve the driving performance of the whole machine. The final drive box assembly has a closed - type structure and a long service life. Brief description of the drawings:

[0018] Figure 1 is the overall structure diagram of the present utility model;

[0019] Figure 2 is the overall transmission schematic diagram of the present utility model;

[0020] Figure 3 is the internal structure sectional view of the gearbox body of the present utility model;

[0021] Figure 4 is the structure diagram of the gear - shifting part of the present utility model;

[0022] Figure 5 is a sectional view showing the structure of the four-wheel drive transfer case of the present utility model;

[0023] Figure 6 is the differential lock structure of the present utility model Figure 1 ;

[0024] Figure 7 is the differential lock structure of the present utility model Figure 2 ;

[0025] Figure 8 is the differential lock structure of the present utility model Figure 3 ;

[0026] Figure 9 is a sectional view showing the structure of the final drive housing assembly of the present utility model;

[0027] Figure 10 is a combined drawing of the full-disc brake solution of the present utility model.

[0028] In the figure: 1. Transmission housing; 2. First shaft; 3. Second shaft; 4. Third shaft; 5. Differential assembly; 6. Left half shaft; 7. Right half shaft; 8. Hydraulic continuously variable motor; 9. First shaft gear A; 10. First stage reduction driven gear; 11. Third shaft gear A; 12. Connecting shaft; 13. Final drive housing assembly; 14. Four-wheel drive transfer case; 15. Connecting plate; 16. Input spline sleeve; 17. Second shaft gear A; 18. Second shaft gear B; 19. Third gear driving gear; 20. First gear driven gear; 21. Second gear driven gear; 22. First and second gear hub sleeve; 23. Third gear hub sleeve; 24. Limiting sleeve; 25. First and second gear fork shaft; 26. Third gear fork shaft; 27. First and second gear shift fork; 28. Third gear shift fork; 29. Interlock pin; 30. Neutral switch transition pin; 31. Neutral switch assembly; 32. Left side gear; 33. Differential lock spline shaft; 34. Differential lock spline sleeve; 35. Connecting pin shaft; 36. Cross shaft; 37. Internal spline hole; 38. Differential lock fork shaft; 39. Differential lock shift fork; 40. Differential lock inner rocker arm; 41. Linkage rotating shaft; 42. Differential lock outer rocker arm; 43. Return spring; 44. Brake disc; 45. Brake caliper; 46. Full-disc brake; 47. Final drive housing body; 48. Final drive housing cover; 49. Final drive input shaft; 50. Final drive output shaft; 51. Final drive input gear A; 52. Final drive large gear; 53. Parking brake assembly; 54. Spherical hole; 55. Grooved hole. Specific embodiments:

[0029] The present utility model will be further described below with specific embodiments. Refer to Figure 1 —10:

[0030] A front drive axle assembly of a hydraulic continuously variable harvester, comprising a gearbox body 1, in which a first shaft 2, a second shaft 3, a third shaft 4, the left half shaft 6 of a differential assembly 5 and the right half shaft 7 are rotatably connected. One end of the first shaft 2 is in transmission connection with the output end of a hydraulic continuously variable motor 8. A first shaft gear A9 is sleeved on the first shaft 2. A first-stage reduction driven gear 10 meshing with the first shaft gear A9 is sleeved on the second shaft 3. The second shaft 3 and the third shaft 4 are in transmission cooperation through a gear shift gear assembly. A third shaft gear A11 meshing with the input gear of the differential assembly 5 is sleeved on the third shaft 4. The left half shaft 6 and the right half shaft 7 of the differential assembly 5 are respectively in transmission connection with the input ends of the corresponding side end transmission box assemblies 13 through connecting shafts 12. One end of the third shaft 4 extends out of the gearbox body 1 and forms a four-wheel drive reserved end for transmission cooperation with the input end of a four-wheel drive transfer case 14.

[0031] The utility model is driven by a hydraulic continuously variable motor 8 and has a transmission mechanism with multiple gear shifts to meet the requirements of simple operation and stable and reliable transmission. A four-wheel drive reserved end capable of transmission cooperation with the four-wheel drive transfer case 14 is reserved to determine whether to combine with the four-wheel drive according to actual operation requirements, ensuring that the whole machine can have sufficient driving force.

[0032] Among them, in order to enable the first shaft 2 to be stably connected to the output end of the hydraulic continuously variable motor 8 and avoid interference from the outside to the transmission between the two, the gearbox body 1 is fixedly connected to the hydraulic continuously variable motor 8 through a connecting disc 15, and the output end of the hydraulic continuously variable motor 8 and the corresponding end of the first shaft 2 are in transmission connection through an input spline sleeve 16.

[0033] Furthermore, in this embodiment, the specific structure of the gear shift gear assembly is as follows: The gear shift gear assembly includes a second shaft gear A17, a second shaft gear B18 and a third gear driving gear 19 arranged on the second shaft 3. A first gear driven gear 20 meshing with the second shaft gear A17 and a second gear driven gear 21 meshing with the second shaft gear B18 are rotatably sleeved on the third shaft 4. An one-two gear hub sleeve 22 is arranged between the first gear driven gear 20 and the second gear driven gear 21. The one-two gear hub sleeve 22 is engaged with the first gear driven gear 20 or the second gear driven gear 21 to realize the synchronous rotation of the third shaft 4 and the corresponding driven gear. The third gear driving gear 19 is rotatably sleeved on the second shaft 3 and meshes with the third shaft gear A11. A third gear hub sleeve 23 and a limiting sleeve 24 axially cooperating with the third gear driving gear 19 to limit the third gear hub sleeve 23 are sequentially arranged on the second shaft 3 on one side of the third gear driving gear 19. The third gear hub sleeve 23 is engaged with the third gear driving gear 19 to realize the synchronous rotation of the second shaft 3 and the third gear driving gear 19. That is, in this embodiment, there are three gears between the second shaft 3 and the third shaft 4, and the hydraulic continuously variable motor 8 can perform continuously variable speed output in any gear.

[0034] And, for the convenience of gear shifting operation, a first and second gear shift shaft 25 and a third gear shift shaft 26 that can axially slide relative to each other are arranged side by side in the gearbox housing 1. A first and second gear shift fork 27 that is drivingly engaged with the first and second gear hub sleeve 22 is fixedly sleeved on the first and second gear shift shaft 25. A third gear shift fork 28 that is drivingly engaged with the third gear hub sleeve 23 is fixedly sleeved on the third gear shift shaft 26. An interlock pin 29 is arranged between the first and second gear shift shaft 25 and the third gear shift shaft 26. An interlock groove for inserting the interlock pin 29 is formed on the side wall of the first and second gear shift shaft 25. An interlock through hole is formed on the side wall of the third gear shift shaft 26. A neutral switch transition pin 30 is arranged in the interlock through hole. A neutral switch assembly 31 is arranged on the gearbox housing 1. The telescopic end of the neutral switch assembly 31 can be inserted into the interlock through hole and push the neutral switch transition pin 30 to abut against the interlock pin 29 until the interlock pin 29 is inserted into the interlock groove.

[0035] Considering that when working on muddy, undulating or sandy terrains, individual tires may slip and lose power, in order to enable the two front wheels as driving wheels to travel on muddy, undulating or sandy terrains, the left half shaft gear 32 of the differential assembly 5 is circumferentially fixed and axially slidable on the differential lock spline shaft 33. The left end of the differential lock spline shaft 33 is circumferentially synchronously rotated with the left half shaft 6 through a differential lock spline sleeve 34. And the differential lock spline sleeve 34 and the differential lock spline shaft 33 are axially fixed through a connecting pin shaft 35. An internal spline hole 37 for axially inserting and circumferentially synchronously rotating the differential lock spline shaft 33 is formed on the cross shaft 36 of the differential assembly 5. A differential lock shift shaft 38 is arranged on the gearbox housing 1. A differential lock shift fork 39 is axially slidably connected to the differential lock shift shaft 38. One end of the differential lock shift fork 39 is fixedly sleeved on the differential lock spline sleeve 34, and the other end is provided with a hinge fitting groove. One end of the differential lock inner rocker arm 40 is slidably and hingedly fitted in the hinge fitting groove through a shaft pin and the other end is synchronously rotated with the inner end of a linkage rotating shaft 41 that rotates on the gearbox housing 1. The outer end of the linkage rotating shaft 41 extends out of the gearbox housing 1 and is sleeved with a differential lock outer rocker arm 42. A return spring 43 whose elastic force can push the differential lock spline shaft 33 and the cross shaft 36 to be connected and separated is arranged between the differential lock outer rocker arm 42 and the gearbox housing 1. That is, by rotating the differential lock outer rocker arm 42 to drive the rotation of the differential lock inner rocker arm 40, the differential lock spline sleeve 34 and the differential lock spline shaft 33 are axially inserted into the internal spline hole 37 of the cross shaft 36, and further the left half shaft gear 32 can rotate synchronously with the right half shaft 7 gear.

[0036] Meanwhile, according to the user's usage requirements, a brake disc 44 is arranged at the input end of the final drive housing assembly 13, and a brake caliper 45 that is matched with the brake disc 44 is arranged on the external vehicle frame; or disc brakes 46 that are fixed on the gearbox housing 1 are arranged on the left half shaft 6 and the right half shaft 7.

[0037] Furthermore, the terminal transmission box assembly 13 adopts a fully enclosed structure, and the terminal transmission box assembly 13 includes a terminal transmission box body 47 and a terminal transmission box cover 48. A fully enclosed cavity is formed between the terminal transmission box body 47 and the terminal transmission box cover 48. A terminal input shaft 49 and a terminal output shaft 50 rotate and penetrate the fully enclosed cavity. The terminal input shaft 49 is provided with a terminal input tooth A51, and the terminal output shaft 50 is provided with a terminal transmission gear 52 meshing with the terminal input tooth.

[0038] Furthermore, in this embodiment, a parking brake assembly 53 fixed to the gearbox body 1 is provided on one end of the three shafts 4, and the four-wheel drive reserved end is the portion of the parking brake assembly 53 extending outward from the corresponding end of the three shafts 4.

[0039] In order to ensure that the four-wheel drive reserved end can stably cooperate with the input end of the four-wheel drive transfer case 14 in transmission and realize rapid disassembly and assembly of the connection and cooperation between the two, a plurality of spherical holes 54 are evenly distributed circumferentially on the outer ring wall of the four-wheel drive reserved end, and steel balls are arranged in the spherical holes 54. The four-wheel drive transfer case 14 is fixed on the parking brake assembly 53, and a slotted hole 55 is provided on the input end face of the four-wheel drive transfer case 14 for axial insertion of the four-wheel drive reserved end and the steel balls.

[0040] Transmission route description of the utility model:

[0041] The first gear transmission route is: the hydraulic continuously variable speed motor 8 outputs power → the first shaft 2 → the first shaft tooth A9 → the primary reduction driven gear 10 → the second shaft 3 → the second shaft tooth A17 → the first gear driven gear 20 → the first and second gear hub sleeves 22 engage with the first gear driven gear 20 → the third shaft 4 (the four-wheel drive reserved end extending out of the parking brake assembly 53 drives the four-wheel drive transfer case 14) → the third shaft tooth A11 → the differential assembly 5 → the left half shaft 6 and the right half shaft 7 → the connecting shaft 12 → the terminal input shaft 49 → the terminal input tooth A51 → the terminal transmission gear 52 → the terminal output shaft 50 → drives the tire to rotate and the whole machine moves.

[0042] The second gear transmission route is: the hydraulic continuously variable speed motor 8 outputs power → the first shaft 2 → the first shaft tooth A9 → the first reduction driven gear 10 → the second shaft 3 → the second shaft tooth B18 → the second gear driven gear 21 → the first and second gear hub sleeves 22 engage with the second gear driven gear 21 → the third shaft 4 (the four-wheel drive reserved end extending out of the parking brake assembly 53 drives the four-wheel drive transfer case 14) → the third shaft tooth A11 → the differential assembly 5 → the left half shaft 6 and the right half shaft 7 → the connecting shaft 12 → the terminal input shaft 49 → the terminal input tooth A51 → the terminal transmission gear 52 → the terminal output shaft 50 → drives the tire to rotate and the whole machine moves.

[0043] The transmission route of the third gear is as follows: the hydraulic continuously variable motor 8 outputs power → the first shaft 2 → the first shaft gear A9 → the first-stage reduction driven gear 10 → the second shaft 3 → the third gear hub sleeve 23 engages with the third gear driving gear 19 → the third gear driving gear 19 → the third shaft gear A11 → the third shaft 4 (extends out of the four-wheel drive reserved end of the parking brake assembly 53 to drive the four-wheel drive transfer case 14) → the differential assembly 5 → the left half shaft 6 and the right half shaft 7 → the connecting shaft 12 → the end input shaft 49 → the end input gear A51 → the end driving large gear 52 → the end output shaft 50 → drives the tire to rotate and the whole machine moves forward.

[0044] The locking principle of the differential lock: operating the rotation of the outer rocker arm 42 of the differential lock → the rotation of the inner rocker arm 40 of the differential lock → the axial movement of the differential lock fork 39 → the axial movement of the differential lock spline sleeve 34 and the differential lock spline shaft 33 → the differential lock spline shaft 33 engages with the internal spline hole 37 of the cross shaft 36 → locks the differential function of the differential.

[0045] The above embodiments are only one of the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A front drive axle assembly of a hydrostatic continuously variable transmission harvester, characterized in that: It includes a transmission housing (1). Inside the transmission housing (1), a shaft (2), a second shaft (3), a third shaft (4), the left half shaft (6) of the differential assembly (5), and the right half shaft (7) are rotatably connected. One end of the first shaft (2) is in transmission connection with the output end of the hydrostatic continuously variable transmission motor (8). A first shaft gear A (9) is sleeved on the first shaft (2). A first-stage reduction driven gear (10) meshing with the first shaft gear A (9) is sleeved on the second shaft (3). The second shaft (3) and the third shaft (4) are in transmission cooperation through a gear shifting gear assembly. A third shaft gear A (11) meshing with the input gear of the differential assembly (5) is sleeved on the third shaft (4). The left half shaft (6) and the right half shaft (7) of the differential assembly (5) are respectively in transmission connection with the input ends of the corresponding side end transmission box assemblies (13) through connecting shafts (12). One end of the third shaft (4) extends out of the transmission housing (1) and forms a four-wheel drive reserved end for transmission cooperation with the input end of the four-wheel drive transfer case (14).

2. The front drive axle assembly of a hydrostatic continuously variable harvesting machine according to claim 1, characterized in that: The transmission housing (1) is fixedly connected to the hydrostatic continuously variable transmission motor (8) through a connecting plate (15). The output end of the hydrostatic continuously variable transmission motor (8) and the corresponding end of the first shaft (2) are in transmission connection through an input spline sleeve (16).

3. The front drive axle assembly of a hydrostatic continuously variable harvesting machine according to claim 1, characterized in that: The gear shifting gear assembly includes a second shaft gear A (17), a second shaft gear B (18), and a third gear driving gear (19) arranged on the second shaft (3). A first gear driven gear (20) meshing with the second shaft gear A (17) and a second gear driven gear (21) meshing with the second shaft gear B (18) are rotatably sleeved on the third shaft (4). An first and second gear hub sleeve (22) is arranged between the first gear driven gear (20) and the second gear driven gear (21). The first and second gear hub sleeve (22) engages with the first gear driven gear (20) or the second gear driven gear (21) to realize the synchronous rotation of the third shaft (4) and the corresponding driven gear. The third gear driving gear (19) is rotatably sleeved on the second shaft (3) and meshes with the third shaft gear A (11). A third gear hub sleeve (23) and a limiting sleeve (24) axially cooperating with the third gear driving gear (19) to limit the third gear hub sleeve (23) are sequentially arranged on the second shaft (3) on one side of the third gear driving gear (19). The third gear hub sleeve (23) engages with the third gear driving gear (19) to realize the synchronous rotation of the second shaft (3) and the third gear driving gear (19).

4. The front drive axle assembly of a hydrostatic continuously variable transmission harvester according to claim 3, characterized in that: Inside the transmission housing (1), a first / second gear shift shaft (25) and a third gear shift shaft (26) that can axially slide relative to each other are arranged side by side. A first / second gear shift fork (27) that is drivingly engaged with the first / second gear hub sleeve (22) is fixedly sleeved on the first / second gear shift shaft (25). A third gear shift fork (28) that is drivingly engaged with the third gear hub sleeve (23) is fixedly sleeved on the third gear shift shaft (26). An interlock pin (29) is arranged between the first / second gear shift shaft (25) and the third gear shift shaft (26). An interlock groove for inserting the interlock pin (29) is formed on the side wall of the first / second gear shift shaft (25). An interlock through hole is formed on the side wall of the third gear shift shaft (26). A neutral switch transition pin (30) is arranged inside the interlock through hole. A neutral switch assembly (31) is arranged on the transmission housing (1). The telescopic end of the neutral switch assembly (31) can insert into the interlock through hole and push the neutral switch transition pin (30) against the interlock pin (29) until the interlock pin (29) inserts into the interlock groove.

5. A front drive axle assembly of a hydrostatic continuously variable harvesting machine according to claim 1, characterized in that: The left half shaft gear (32) of the differential assembly (5) is circumferentially fixed and axially slidable on the differential lock spline shaft (33). The left end of the differential lock spline shaft (33) is circumferentially synchronously rotated with the left half shaft (6) through a differential lock spline sleeve (34). And the differential lock spline sleeve (34) and the differential lock spline shaft (33) are axially fixed through a connecting pin shaft (35). An internal spline hole (37) for axially inserting and circumferentially synchronously rotating the differential lock spline shaft (33) is formed on the cross shaft (36) of the differential assembly (5). A differential lock shift shaft (38) is arranged on the transmission housing (1). A differential lock shift fork (39) is axially slidably connected to the differential lock shift shaft (38). One end of the differential lock shift fork (39) is fixedly sleeved on the differential lock spline sleeve (34), and the other end is provided with a hinge fitting groove. One end of the differential lock inner rocker arm (40) is slidably and hingedly fitted in the hinge fitting groove through a shaft pin, and the other end is synchronously rotated with the inner end of a linkage rotating shaft (41) that rotates on the transmission housing (1). The outer end of the linkage rotating shaft (41) extends out between the transmission housings (1) and is sleeved with a differential lock outer rocker arm (42). A return spring (43) whose elastic force can push the differential lock spline shaft (33) and the cross shaft (36) to be connected and separated is arranged between the differential lock outer rocker arm (42) and the transmission housing (1).

6. The front drive axle assembly of a hydrostatic continuously variable harvesting machine according to claim 1, characterized in that: A brake disc (44) is arranged at the input end of the final drive housing assembly (13), and a brake caliper (45) that cooperates with the brake disc (44) is arranged on the external vehicle frame. Or full disc brakes (46) that are fixed on the transmission housing (1) are arranged on the left half shaft (6) and the right half shaft (7).

7. A front drive axle assembly of a hydraulic continuously variable transmission harvester according to claim 1 or 6, characterized in that: The final drive housing assembly (13) includes a final drive housing body (47) and a final drive housing cover (48). A fully enclosed cavity is formed between the final drive housing body (47) and the final drive housing cover (48). A final input shaft (49) and a final output shaft (50) are rotationally and penetratingly fitted inside the fully enclosed cavity. A final input gear A (51) is sleeved on the final input shaft (49). A final drive large gear (52) that meshes with the final input gear is sleeved on the final output shaft (50).

8. A front drive axle assembly of a hydrostatic continuously variable harvester according to claim 1, characterized in that: One end of the three - shaft (4) is provided with a parking brake assembly (53) fixed on the transmission housing (1), and the four - wheel drive reserved end is the part where the corresponding end of the three - shaft (4) extends outwards from the parking brake assembly (53).

9. The front drive axle assembly of a hydrostatic continuously variable transmission harvester according to claim 8, characterized in that: A number of spherical holes (54) are circumferentially and uniformly distributed on the outer circumferential wall of the four - wheel drive reserved end. Steel balls are arranged in the spherical holes (54). The four - wheel drive transfer case (14) is fixed on the parking brake assembly (53), and a slotted hole (55) for the axial insertion of the four - wheel drive reserved end and the steel balls is formed on the input end face of the four - wheel drive transfer case (14).

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