Tractor gearbox transmission device

Abstract

The utility model provides a tractor gearbox transmission device which comprises a gearbox body arranged in a tractor, an input shaft, an auxiliary speed change output shaft, a main speed change gear structure, an auxiliary speed change gear structure, a reverse gear structure and a creeper gear structure are arranged in the gearbox body, and a synchronizer is arranged in the gearbox body. The reverse gear structure comprises a reverse gear driving gear, a reverse gear driven gear and a reverse gear intermediate shaft, and the reverse gear driving gear corresponds to the synchronizer and the input shaft. The gear shifting device is more in gear number, dense and reasonable, and is very suitable for meeting the requirement of a high-horsepower tractor for the gears; the reverse gear and the main speed change adopt a synchronizer for gear shifting, so that the impact and noise of the gear when the gear is engaged can be effectively eliminated, the abrasion is reduced, the gear shifting is smoother, the durability and the reliability of the gearbox are improved, and the driving comfort is improved; the bearing capacity is high, and the transmission is more stable; the number of gears and the cost are reduced; and the interchangeability of parts of the gearbox is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a tractor gearbox transmission device. Background Technology

[0002] Existing transmissions such as Figure 1 As shown, this gearbox is suitable for tractors with 80 to 110 horsepower. Its main transmission features are: 4×3 shuttle shifting and meshing sleeve shifting. However, the main defects and shortcomings of this gearbox are: limited number of gears, only 12+12 shuttle shifting; the crawler gear uses planetary gear reduction, which is complex in structure and high in cost; the gearbox uses spur gear transmission throughout, which limits transmission efficiency; and the mechanical main transmission uses traditional meshing sleeve shifting, which results in uneven gear engagement and easy jamming.

[0003] Therefore, this utility model provides a tractor gearbox transmission device. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a tractor gearbox transmission device to solve the problems mentioned in the background. This utility model has a large number of gears, which are dense and reasonable, making it very suitable for the gear requirements of high-horsepower tractors. The reverse gear and main transmission use synchronizer shifting, which can effectively eliminate the impact and noise of gears when engaging, reduce wear, make shifting smoother, improve the durability and reliability of the gearbox, and improve driving comfort. It has the advantages of strong load-bearing capacity and smoother transmission; it reduces the number of gears and lowers costs; it greatly improves the interchangeability of gearbox parts; the II shaft and auxiliary transmission output shaft are equipped with a forced lubrication structure to lubricate the needle roller bearings on the shaft; the synchronizer controlling the forward and reverse gears is positioned relatively high relative to the gearbox and is not completely immersed in oil. To prevent it from burning out, the synchronizer is equipped with a forced lubrication structure.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A tractor gearbox transmission device includes a gearbox body installed inside a tractor. The gearbox body houses a power output front shaft, an input shaft, a secondary transmission output shaft, a main transmission gear structure, a secondary transmission gear structure, a reverse gear structure, and a creeper gear structure. A synchronizer is installed inside the gearbox body. The reverse gear structure includes a reverse drive gear, a reverse driven gear, and a reverse intermediate shaft. The reverse drive gear corresponds to the synchronizer and the input shaft. The main transmission gear structure includes a shaft I, a first-gear drive gear, a second-gear drive gear, a third-gear drive gear, and a fourth-gear drive gear. The transmission includes a drive gear, a V-gear drive gear, a VI-gear drive gear, a VI-gear driven gear, a V-gear driven gear, a IV-gear driven gear, a III-gear driven gear, a II-gear driven gear, and a I-gear driven gear. Shaft I corresponds to the synchronizer and the input shaft. The secondary transmission gear structure includes a secondary transmission double gear, a low-to-medium gear drive gear, a high-to-medium gear drive gear, shaft II, a low-to-medium gear driven gear, and a low-gear driven gear. The secondary transmission double gear corresponds to shaft I. The creeper gear structure includes a creeper double gear and a creeper driven gear. The creeper double gear corresponds to the secondary transmission double gear. The transmission body is equipped with multiple auxiliary bearings and multiple auxiliary bushings.

[0006] Furthermore, the power output front section shaft coaxially passes through the inner hole of the input shaft, and the power output front section shaft is supported in the hole of the input shaft by an auxiliary bushing. An input shaft bearing cover is fixed to one side of the gearbox body by bolts. A first bearing is installed in the gearbox body. The input shaft passes through the first bearing, the reverse gear drive gear and the synchronizer in sequence. The input shaft is coaxially connected to the input shaft bearing cover. The reverse gear drive gear is connected to the input shaft through an auxiliary bearing. Washers are installed at both ends of the synchronizer. The inner hole of the synchronizer meshes with the outer spline of the input shaft. The reverse gear drive gear meshes with the spline of the synchronizer.

[0007] Furthermore, the gearbox body is equipped with a reverse gear bushing and a reverse gear transition gear. The reverse gear intermediate shaft passes coaxially through an auxiliary bearing, a reverse gear driven gear, a reverse gear bushing, a reverse gear transition gear, and another auxiliary bearing in sequence. The right end of the reverse gear intermediate shaft is limited within the gearbox body by the auxiliary bearing. The gearbox body is equipped with a reverse gear front cover, which corresponds to the reverse gear intermediate shaft. The inner holes of the reverse gear driven gear and the reverse gear transition gear are both engaged with the outer splines of the reverse gear intermediate shaft. The reverse gear drive gear is engaged with the reverse gear driven gear.

[0008] Furthermore, a second bearing is installed inside the gearbox body. The I shaft coaxially passes through the auxiliary bearing, the I gear drive gear, the auxiliary bushing, the II gear drive gear, the III gear drive gear, the auxiliary bushing, the IV gear drive gear, the V gear drive gear, the auxiliary bushing, the VI gear drive gear, the second bearing, and the auxiliary bearing from left to right. A locking nut is installed at the end of the I shaft. One end of the I shaft meshes with the spline at one end of the synchronizer. One end of the input shaft is connected to one end of the I shaft through the auxiliary bearing. The outer circle of the I shaft meshes with the spline of the inner hole of the I gear drive gear, the II gear drive gear, the III gear drive gear, the IV gear drive gear, the V gear drive gear, and the VI gear drive gear.

[0009] Furthermore, one end of the secondary transmission double gear is sequentially fitted into the low-to-medium gear drive gear, the medium-to-high gear drive gear, and the auxiliary bearing. The upper end cover of the bearing is installed on the gearbox body by bolts. The other end of the secondary transmission double gear is coaxially connected to shaft I. One end of the creep gear double gear is coaxially connected to one end of the secondary transmission double gear through the auxiliary bearing. The rear axle housing is installed inside the gearbox body, and the other end of the creep gear double gear is connected to the rear axle housing through the bearing.

[0010] Furthermore, a third bearing is installed within the gearbox housing. Shaft II, from right to left, passes through the third bearing, a retaining ring, the VI gear driven gear, a synchronizer, the V gear driven gear, a retaining ring, the IV gear driven gear, a synchronizer, the III gear driven gear, a retaining ring, the II gear driven gear, a synchronizer, the I gear driven gear, a retaining ring, and an auxiliary bearing. Shaft II is confined within the gearbox housing by the third bearing. The VI gear driven gear, V gear driven gear, IV gear driven gear, III gear driven gear, II gear driven gear, and I gear driven gear... Bushings and needle roller bearings are installed between the inner bore of the wheel and the outer circle of shaft II. The inner bore of the synchronizer meshes with the spline of the outer circle of shaft II. The synchronizer meshes with the splines of the driven gears of VI, V, IV, III, II and I respectively. Shaft II is a hollow shaft. A front cover of shaft II is fixed to the gearbox body by bolts. One end of the front cover of shaft II is coaxially installed with shaft II. A forced lubrication oil passage communicating with the gearbox body and the inner bore of shaft II is opened in the front cover of shaft II.

[0011] Furthermore, the gearbox housing is equipped with a mid-to-high-range driven gear, a gear seat, a meshing sleeve, a mid-to-low-range driven gear, a low-range driven gear, and a fourth bearing. The auxiliary transmission output shaft passes through the auxiliary bearing, mid-to-high-range driven gear, gear seat, meshing sleeve, mid-to-low-range driven gear, gear ring, low-range driven gear, gear seat, meshing sleeve, washer, and fourth bearing sequentially from right to left. The fourth bearing is coaxially connected to shaft II. A bearing lower end cover is fixed to the gearbox housing by bolts. The inner hole of the gear seat meshes with the outer spline of the auxiliary transmission output shaft, and the outer circle of the gear seat meshes with the inner spline of the meshing sleeve. Bushings and needle roller bearings are installed in the inner holes of the mid-to-high-range driven gear, mid-to-low-range driven gear, and low-range driven gear and the outer circle of the auxiliary transmission output shaft. A direct gear gear seat is installed at one end of the auxiliary transmission output shaft mounted on the bearing lower end cover. The inner hole of the direct gear gear seat meshes with the outer spline of the auxiliary transmission output shaft. A blind hole is opened inside the auxiliary transmission output shaft, which communicates with the oil passage inside shaft II and the oil passage inside the front end cover of shaft II.

[0012] Furthermore, a small bevel gear shaft is installed on the rear axle of the tractor. A needle roller bearing and a crawler gear seat are provided between the inner hole of the crawler gear driven gear and the small bevel gear shaft. The inner hole of the crawler gear seat meshes with the outer spline of the small bevel gear shaft, and the inner hole of the crawler gear sleeve meshes with the outer spline of the crawler gear seat.

[0013] Furthermore, the gearbox body is equipped with a forced lubrication reservoir pipe, which is parallel to the input shaft. A forced lubrication connector is installed on the gearbox body. One end of the forced lubrication connector is located on one side of the gearbox body and is equipped with a sealing ring. The other end of the forced lubrication connector passes through the forced lubrication reservoir pipe. Both the forced lubrication reservoir pipe and the forced lubrication connector have forced lubrication oil passages. A spray oil passage is also provided in the forced lubrication reservoir pipe, and the spray oil passage is connected to the forced lubrication oil passage.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a tractor gearbox transmission device, which includes a main gear shift structure, a secondary gear shift structure, a reverse gear structure, a creeper gear structure, and a synchronizer.

[0015] The main transmission has 6 gears, the auxiliary transmission has 4 gears, and a crawler gear is optional. When the crawler gear is selected, it can achieve 48 forward gears and 48 reverse gears. The number of gears is relatively large and well-reasoned, making it very suitable for the gear requirements of high-horsepower tractors. The reverse gear and main transmission use synchronized shifting, which can effectively eliminate the impact and noise of gears during engagement, reduce wear, make shifting smoother, improve the durability and reliability of the transmission, and improve driving comfort. The reverse gear and main transmission use helical gears, which have the advantages of large overlap, strong load-bearing capacity, and smoother transmission. The two gears of the reverse gear are shared with the main and auxiliary gears of the first gear of the main transmission, reducing the number of gears and lowering costs. The reverse gear synchronizer is the same as the main transmission synchronizer, the bushing and needle roller bearing of the inner hole of the main transmission driven gear are the same, the bushing and needle roller bearing of the inner hole of the auxiliary transmission driven gear are the same, and some gear rings are the same, which greatly improves the interchangeability of transmission parts. The II shaft and the auxiliary transmission output shaft are equipped with a forced lubrication structure to lubricate the needle roller bearings on the shaft. The synchronizer that controls forward and reverse gears is located relatively high relative to the transmission, and in order to prevent it from burning out, the synchronizer is equipped with a forced lubrication structure. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of an existing gearbox transmission device;

[0017] Figure 2 This is a schematic diagram of the assembly structure of the input shaft bearing cover, reverse gear front cover, and gearbox body in a tractor gearbox transmission device according to the present invention.

[0018] Figure 3 This is a schematic diagram of the overall assembly cross-sectional structure of a tractor gearbox transmission device according to the present invention.

[0019] Figure 4 This is a schematic diagram of the assembly structure of the forced lubrication joint and the forced lubrication oil reservoir in the transmission device of a tractor gearbox according to the present invention.

[0020] In the diagram: 1. Power output front shaft; 2. Input shaft; 3. Input shaft bearing cover; 4. First bearing; 5. Reverse gear front cover; 6. Reverse gear drive gear; 7. Reverse gear driven gear; 8. Reverse gear intermediate shaft; 9. Synchronizer; 10. Reverse gear bushing; 11. Reverse gear transition gear; 12. Gear I drive gear; 13. Gear II drive gear; 14. Gear III drive gear; 15. Shaft I; 16. Gear II drive gear; 17. Gear V drive gear; 18. Gear VI drive gear; 19. Locking nut; 20. Secondary transmission double gear; 21. Low-to-medium gear drive gear; 22. High-to-medium gear drive gear; 23. Bearing upper cover; 24. Creep gear double gear; 25. Direct drive gear seat; 26. Creep gear driven gear; 27. Creep... 28. Gear seat; 29. ​​Creep gear sleeve; 30. Bearing lower end cover; 31. Medium-high gear driven gear; 32. Gear seat; 33. Meshing sleeve; 34. Medium-low gear driven gear; 35. Low gear driven gear; 36. Secondary transmission output shaft; 37. Shaft II; 38. VI gear driven gear; 39. V gear driven gear; 40. IV gear driven gear; 41. III gear driven gear; 42. II gear driven gear; 43. I gear driven gear; 44. Needle roller bearing; 45. Bushing; 46. II shaft front end cover; 47. Forced lubrication joint; 48. Sealing ring; 49. Forced lubrication reservoir oil pipe; 51. Gearbox housing; 52. Second bearing; 53. Third bearing; 54. Rear axle housing; 55. Small bevel gear shaft; 56. Fourth bearing. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please see Figures 1 to 4This utility model provides a technical solution: a tractor gearbox transmission device, including a gearbox body 51 installed inside the tractor. The gearbox body 51 houses a power output front shaft 1, an input shaft 2, a secondary transmission output shaft 35, a main transmission gear structure, a secondary transmission gear structure, a reverse gear structure, and a creeper gear structure. A synchronizer 9 is installed inside the gearbox body 51. The reverse gear structure includes a reverse drive gear 6, a reverse driven gear 7, and a reverse intermediate shaft 8. The reverse drive gear 6 corresponds to the synchronizer 9 and the input shaft 2. The main transmission gear structure includes a shaft I 15, a first-gear drive gear 12, a second-gear drive gear 13, a third-gear drive gear 14, a fourth-gear drive gear 16, a fifth-gear drive gear 17, and a sixth-gear drive gear 16. The transmission includes a drive gear 18, a VI-gear driven gear 37, a V-gear driven gear 38, an IV-gear driven gear 39, a III-gear driven gear 40, a II-gear driven gear 41, and a I-gear driven gear 42. Shaft I 15 corresponds to synchronizer 9 and input shaft 2. The secondary transmission gear structure includes a secondary transmission double gear 20, a low-to-medium gear drive gear 21, a high-to-medium gear drive gear 22, shaft II 36, a low-to-medium gear driven gear 33, and a low-gear driven gear 34. The secondary transmission double gear 20 corresponds to shaft I 15. The creeper gear structure includes a creeper gear double gear 24 and a creeper gear driven gear 26. The creeper gear double gear 24 corresponds to the secondary transmission double gear 20. The transmission body 51 is equipped with multiple auxiliary bearings and multiple auxiliary bushings.

[0023] In this embodiment, one end of the input shaft 2 coaxially passes through the bearing 4, the reverse gear drive gear 6, and the synchronizer 9 in sequence. The left end is coaxially fitted with the input shaft bearing cover 3, which is bolted to the gearbox body 51 for axial positioning of the input shaft 2. Two bearings and washers are also provided between the reverse gear drive gear 6 and the input shaft 2. Washers are provided at both ends of the synchronizer 9. The inner hole of the synchronizer 9 meshes with the spline of the outer diameter of the input shaft 2. One end of the reverse gear drive gear 6 meshes with the spline of the synchronizer 9. The synchronizer is used to control forward and reverse movement.

[0024] The reverse gear intermediate shaft 8, from left to right, coaxially passes through a bearing, a reverse gear driven gear 7, a reverse gear bushing 10, a reverse gear transition gear 11, and another bearing. Its right end is restrained within a hole in the gearbox housing 51 by a bearing, and its left end is bolted to the reverse gear front cover 5 for axial restraint. The inner hole of the reverse gear driven gear 7 meshes with the outer spline of the reverse gear intermediate shaft 8, and the inner hole of the reverse gear transition gear 11 also meshes with the outer spline of the reverse gear intermediate shaft 8. The reverse gear drive gear 6 and the reverse gear driven gear 7 mesh.

[0025] Shaft I 15, from left to right, coaxially passes through the bearing, first gear drive gear 12, bushing, second gear drive gear 13, third gear drive gear 14, bushing, fourth gear drive gear 16, fifth gear drive gear 17, bushing, sixth gear drive gear 18, second bearing 52, and bearing, and is locked with lock nut 19. Shaft I 15 is limited within the hole of gearbox body 51 by the second bearing 52. One end of shaft I 15 engages with the spline of one end of synchronizer 9. A bearing is also provided between one end of input shaft 2 and one end of shaft I 15. The outer circle of shaft I 15 engages with the spline of the inner hole of first gear drive gear 12, second gear drive gear 13, third gear drive gear 14, fourth gear drive gear 16, fifth gear drive gear 17, and sixth gear drive gear 18.

[0026] One end of the auxiliary transmission double gear 20 is sequentially fitted with the low-to-medium gear drive gear 21, the medium-to-high gear drive gear 22, and a bearing, and the upper end cover 23 of the bearing is fixed to the gearbox body 51 with bolts for axial limiting. The other end of the auxiliary transmission double gear 20 is coaxially connected to shaft I 15 via a bearing. One end of the creep gear double gear 24 is coaxially connected to one end of the auxiliary transmission double gear 20 via a bearing, and the other end is supported on the rear axle housing 54 via a bearing.

[0027] Shaft II 36 passes through the third bearing 53, spacer ring, VI gear driven gear 37, synchronizer 9, V gear driven gear 38, retaining ring, IV gear driven gear 39, synchronizer 9, III gear driven gear 40, retaining ring, II gear driven gear 41, synchronizer 9, I gear driven gear 42, retaining ring, and bearing from right to left, and is locked with a round nut. Shaft II 36 is limited within the hole of gearbox housing 51 by the third bearing 53. Bushings 44 and needle roller bearings 43 are arranged between the inner holes of VI gear driven gear 37, V gear driven gear 38, IV gear driven gear 39, III gear driven gear 40, II gear driven gear 41, and I gear driven gear 42 and the outer circle of shaft II 36. The inner hole of synchronizer 9 engages with the spline of the outer circle of shaft II 36. Synchronizer 9 engages with the splines of the I to VI gear driven gears. Shaft II 36 is a hollow shaft. The front cover 45 of shaft II is bolted to the gearbox housing 51, and one end of the front cover 45 is coaxially installed in the hole at one end of shaft II 36. The front cover 45 of shaft II has a forced lubrication oil passage that communicates with the inner hole of gearbox housing 51 and shaft II 36 for forced lubrication of the needle roller bearing on shaft II 36.

[0028] The secondary transmission output shaft 35 passes through the bearing, the mid-to-high-range driven gear 30, the gear seat 31, the meshing sleeve 32, the mid-to-low-range driven gear 33, the retaining ring, the low-range driven gear 34, the gear seat 31, the meshing sleeve 32, the washer, and the fourth bearing 56 from right to left. It is coaxially connected to the II shaft 36 via the fourth bearing 56 and is also limited within one end hole of the II shaft 36 by the fourth bearing 56. The lower end cover 29 of the bearing is fixed to the gearbox body 51 by bolts for limiting the secondary transmission output shaft 35. The inner hole of the gear seat 31 meshes with the spline of the outer diameter of the secondary transmission output shaft 35. The outer diameter of the gear seat 31 meshes with the spline of the inner hole of the meshing sleeve 32. Bushings and needle roller bearings are arranged in the inner holes of the mid-to-high-range driven gear 30, the mid-to-low-range driven gear 33, and the low-range driven gear 34, as well as on the outer diameter of the secondary transmission output shaft 35. The lower end cover 29 of the auxiliary transmission output shaft 35 is fitted onto the direct gear seat 25 and then secured by a shaft retaining ring. The inner hole of the direct gear seat 25 meshes with the outer spline of the auxiliary transmission output shaft 35. A blind hole is provided inside the auxiliary transmission output shaft 35, which communicates with the oil passage inside the II shaft 36 and the oil passage inside the front end cover 45 of the II shaft, for forced lubrication of the needle roller bearing on the auxiliary transmission output shaft 35.

[0029] A crawler gear driven gear 26 is sleeved on one end of a small bevel gear shaft 55. A needle roller bearing and a crawler gear seat 27 are provided between the inner hole of the crawler gear driven gear 26 and the small bevel gear shaft 55. The inner hole of the crawler gear seat 27 meshes with the outer spline of the small bevel gear shaft 55. The inner hole of the crawler gear sleeve 28 meshes with the outer spline of the crawler gear seat 27. One end of the small bevel gear shaft 55 is locked with a nut for axial positioning of the crawler gear seat 27.

[0030] The forced lubrication reservoir 49 passes through the gearbox housing 51, with both ends supported in corresponding holes, parallel to the input shaft 2. One end of the forced lubrication connector 46 is mounted on the side of the gearbox housing 51 and limited by a sealing ring 47; the other end passes through the forced lubrication reservoir 49. The forced lubrication reservoir 49 has a forced lubrication oil passage, and the forced lubrication connector 46 also has a forced lubrication oil passage inside. The forced lubrication reservoir 49 also has a spray oil passage directly facing the synchronizer 9 that controls forward and reverse movement. These oil passages are interconnected and used to provide forced lubrication to the synchronizer 9 that controls forward and reverse movement, preventing it from burning out.

[0031] Working principle: When engaging forward 6th gear, depress the clutch pedal. Using the shuttle gear operation, the synchronizer controlling forward and reverse gears is engaged to the right by a set stroke, engaging the synchronizer with the spline on the left end of shaft I 15. Using the main gear shift operation, the synchronizer controlling 5th and 6th gears is engaged to the right by a set stroke, engaging the synchronizer with the spline on the 6th gear driven gear 37. Using the auxiliary gear shift operation, the engagement sleeve controlling high and low gears is engaged to the right by a set stroke, engaging the engagement sleeve with the spline on the low gear driven gear 34. Using the creep gear operation, the engagement sleeve 28 controlling creep gears is engaged to the left by a set stroke, engaging the engagement sleeve 28 with the spline on the direct drive gear seat 25. Thus, the forward 6th gear shift is completed. At this time, the power is transmitted sequentially from the engine, input shaft 2, synchronizer 9 which controls forward and reverse, shaft I 15, 6th gear drive gear 18, 6th gear driven gear 37, synchronizer 9 which controls 5th and 6th gears, shaft II 36, auxiliary transmission double gear 20, low gear driven gear 34, meshing sleeve 32 which controls high and low gears, gear seat 31 which controls high and low gears, auxiliary transmission output shaft 35, direct drive gear seat 25, creeper gear sleeve 28, creeper gear seat 27 to the small bevel gear shaft 55, and then to the tractor rear wheel through other transmission devices.

[0032] When it is necessary to engage reverse, low, or mid-range 5th gear with creeper gear, depress the clutch pedal. Using the shuttle gear operation, engage the synchronizer controlling forward and reverse gears to the left by a predetermined distance, engaging the synchronizer with the reverse drive gear 6 (splined). Using the main transmission operation, engage the synchronizer controlling gears 5 and 6 to the left by a predetermined distance, engaging the synchronizer with the V driven gear 38 (splined). Using the auxiliary transmission operation, engage the engagement sleeve controlling medium, high, and low gears to the left by a predetermined distance, engaging the engagement sleeve with the medium and low gear driven gear 33 (splined). Using the creeper gear operation, engage the engagement sleeve 28 controlling the creeper gear to the right by a predetermined distance, engaging the engagement sleeve 28 with the creeper gear seat 27 (splined). Thus, the reverse low-to-medium 5th gear shift with creep gear is completed. At this time, the power is transmitted sequentially from the engine, input shaft 2, synchronizer 9 which controls forward and reverse, reverse drive gear 6, reverse driven gear 7, reverse intermediate shaft 8, reverse transition gear 11, I driven gear 42, I drive gear 12, reverse driven gear 7, I shaft 15, V drive gear 17, V driven gear 38, synchronizer 9 which controls 5th and 6th gears, II shaft 36, auxiliary transmission double gear 20, low-to-medium gear drive gear 21, low-to-medium gear driven gear 23, meshing sleeve 32 which controls medium, high, and low gears, gear seat 31 which controls medium, high, and low gears, auxiliary transmission output shaft 35, creep gear double gear 24, creep gear driven gear 26, creep gear sleeve 28, creep gear gear seat 27 to the small bevel gear shaft 55, and then to the tractor rear wheel through other transmission devices.

[0033] When reverse gear is engaged, the driven gear 42 of gear I and the driving gear 12 of gear I serve as the gear pair for gear I and also as the gear pair for engaging reverse gear. By using common gears, the number of gears can be effectively reduced, thus lowering costs.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tractor transmission drive comprising a transmission housing (51) mounted in a tractor, characterised in that, The gearbox body (51) is internally provided with a power output front shaft (1), an input shaft (2), a sub-transmission output shaft (35), a main transmission gear structure, a sub-transmission gear structure, a reverse gear structure, and a crawl gear structure, and is internally provided with a synchronizer (9), the reverse gear structure includes a reverse gear driving gear (6), a reverse gear driven gear (7), and a reverse intermediate shaft (8), the reverse gear driving gear (6) corresponds to the synchronizer (9) and the input shaft (2), the main transmission gear structure includes a I shaft (15), a I gear driving gear (12), a II gear driving gear (13), a III gear driving gear (14), a IV gear driving gear (16), a V gear driving gear (17), a VI gear driving gear (18), a VI gear driven gear (37), a V gear driven gear (38), a IV gear driven gear (39), a III gear driven gear (40), a II gear driven gear (41), and a I gear driven gear (42), the I shaft (15) corresponds to the synchronizer (9) and the input shaft (2), the sub-transmission gear structure includes a sub-transmission double gear (20), a middle-low gear driving gear (21), a middle-high gear driving gear (22), a II shaft (36), a middle-low gear driven gear (33), and a low gear driven gear (34), the sub-transmission double gear (20) corresponds to the I shaft (15), the crawl gear structure includes a crawl gear double gear (24) and a crawl gear driven gear (26), the crawl gear double gear (24) corresponds to the sub-transmission double gear (20), and the gearbox body (51) is internally provided with a plurality of auxiliary bearings and a plurality of auxiliary shaft sleeves.

2. A tractor gearbox transmission as claimed in claim 1, characterised in that: The power output front shaft (1) coaxially passes through the inner hole of the input shaft (2), the power output front shaft (1) is supported in the hole of the input shaft (2) through an auxiliary bushing, one side of the gearbox body (51) is fixed with an input shaft bearing cover (3) through bolts, the gearbox body (51) is internally provided with a first bearing (4), the input shaft (2) sequentially passes through the first bearing (4), the reverse gear driving gear (6), and the synchronizer (9), the input shaft (2) is coaxially connected with the input shaft bearing cover (3), the reverse gear driving gear (6) is connected with the input shaft (2) through an auxiliary bearing, both ends of the synchronizer (9) are provided with washers, the inner hole of the synchronizer (9) is engaged with the outer circular spline of the input shaft (2), and the spline of the reverse gear driving gear (6) is engaged with the synchronizer (9).

3. A tractor gearbox transmission as claimed in claim 1, characterised in that: The gearbox body (51) is internally provided with a reverse shaft sleeve (10) and a reverse transition gear (11), the reverse intermediate shaft (8) sequentially coaxially passes through an auxiliary bearing, the reverse gear driven gear (7), the reverse shaft sleeve (10), the reverse transition gear (11), and another auxiliary bearing, the right end of the reverse intermediate shaft (8) is limited in the gearbox body (51) through an auxiliary bearing, the gearbox body (51) is internally provided with a reverse front cover (5), the reverse front cover (5) corresponds to the reverse intermediate shaft (8), the inner hole of the reverse gear driven gear (7) and the inner hole of the reverse transition gear (11) are all engaged with the outer circular spline of the reverse intermediate shaft (8), and the reverse gear driving gear (6) is engaged with the reverse gear driven gear (7).

4. A tractor transmission drive as claimed in claim 1, characterised in that: The gearbox body (51) is internally provided with a second bearing (52), the I shaft (15) coaxially passes through the auxiliary bearing, the I gear driving gear (12), the auxiliary shaft sleeve, the II gear driving gear (13), the III gear driving gear (14), the auxiliary shaft sleeve, the IV gear driving gear (16), the V gear driving gear (17), the auxiliary shaft sleeve, the VI gear driving gear (18), the second bearing (52) and the auxiliary bearing from left to right in sequence, the end of the I shaft (15) is provided with a locking nut (19), one end of the I shaft (15) is engaged with the spline of one end of the synchronizer (9), one end of the input shaft (2) is connected with one end of the I shaft (15) through the auxiliary bearing, the outer circle of the I shaft (15) is engaged with the inner hole spline of the I gear driving gear (12), the II gear driving gear (13), the III gear driving gear (14), the IV gear driving gear (16), the V gear driving gear (17) and the VI gear driving gear (18).

5. A tractor transmission drive as claimed in claim 1, wherein: One end of the auxiliary gear double gear (20) is sequentially sleeved into the middle-low gear driving gear (21), the middle-high gear driving gear (22) and the auxiliary bearing, the gearbox body (51) is provided with a bearing upper end cover (23) through bolts, the other end of the auxiliary gear double gear (20) is coaxially connected with the I shaft (15), one end of the crawling gear double gear (24) is coaxially connected with one end of the auxiliary gear double gear (20) through the auxiliary bearing, the gearbox body (51) is internally provided with a rear axle housing (54), the other end of the crawling gear double gear (24) is connected with the rear axle housing (54) through a bearing.

6. A tractor transmission drive as claimed in claim 1, characterised in that: The gearbox body (51) is internally provided with a third bearing (53), the II shaft (36) passes through the third bearing (53), the gear ring, the VI gear driven gear (37), the synchronizer (9), the V gear driven gear (38), the gear ring, the IV gear driven gear (39), the synchronizer (9), the III gear driven gear (40), the gear ring, the II gear driven gear (41), the synchronizer (9), the I gear driven gear (42), the gear ring and the auxiliary bearing from right to left in sequence, the II shaft (36) is limited in the gearbox body (51) through the third bearing (53), the VI gear driven gear (37), the V gear driven gear (38), the IV gear driven gear (39), the III gear driven gear (40), the II gear driven gear (41) and the I gear driven gear (42) are all provided with a bushing (44) and a needle roller bearing (43) between the inner hole and the outer circle of the II shaft (36), the inner hole of the synchronizer (9) is engaged with the spline of the outer circle of the II shaft (36), the synchronizer (9) is engaged with the spline of the VI gear driven gear (37), the V gear driven gear (38), the IV gear driven gear (39), the III gear driven gear (40), the II gear driven gear (41) and the I gear driven gear (42) respectively, the II shaft (36) is a hollow shaft, the gearbox body (51) is fixedly provided with a II shaft front end cover (45) through bolts, one end of the II shaft front end cover (45) is coaxially installed with the II shaft (36), the II shaft front end cover (45) is internally provided with a forced lubricating oil channel communicated with the inner hole of the gearbox body (51) and the II shaft (36).

7. A tractor transmission drive as claimed in claim 1, wherein: The gearbox body (51) is internally provided with a middle-high gear passive gear (30), a gear seat (31), a meshing sleeve (32) and a fourth bearing (56), the auxiliary gearbox output shaft (35) sequentially passes through the auxiliary bearing, the middle-high gear passive gear (30), the gear seat (31), the meshing sleeve (32), the middle-low gear passive gear (33), the gear ring, the low gear passive gear (34), the gear seat (31), the meshing sleeve (32), the washer and the fourth bearing (56) from right to left, the fourth bearing (56) is coaxially connected with the II shaft (36), the gearbox body (51) is fixedly provided with a bearing lower end cover (29) through bolts, the inner hole of the gear seat (31) is in engagement with the outer circle spline of the auxiliary gearbox output shaft (35), the outer circle of the gear seat (31) is in engagement with the inner hole spline of the meshing sleeve (32), the inner holes of the middle-high gear passive gear (30), the middle-low gear passive gear (33) and the low gear passive gear (34) are all provided with bushings and needle bearings on the outer circle of the auxiliary gearbox output shaft (35), one end of the auxiliary gearbox output shaft (35) provided with the bearing lower end cover (29) is provided with a direct gear gear seat (25), the inner hole of the direct gear gear seat (25) is in engagement with the outer circle spline of the auxiliary gearbox output shaft (35), the auxiliary gearbox output shaft (35) is provided with a blind hole, and the blind hole is communicated with the inner oil channel of the II shaft (36) and the inner oil channel of the II shaft front end cover (45).

8. A tractor transmission drive as claimed in claim 1, characterised in that: The tractor rear axle is provided with a small bevel gear shaft (55), and the inner hole of the crawling gear passive gear (26) is provided between the small bevel gear shaft (55) and the needle bearing and the crawling gear gear seat (27), the inner hole of the crawling gear gear seat (27) is in engagement with the outer circle spline of the small bevel gear shaft (55), and the inner hole of the crawling gear gear sleeve (28) is in engagement with the outer circle spline of the crawling gear gear seat (27).

9. A tractor transmission drive as claimed in claim 1, characterised in that: The gearbox body (51) is internally provided with a forced lubrication storage oil pipe (49), the forced lubrication storage oil pipe (49) is parallel to the input shaft (2), the gearbox body (51) is provided with a forced lubrication connector (46), one end of the forced lubrication connector (46) is located on one side of the gearbox body (51) and is provided with a sealing ring (47), the other end of the forced lubrication connector (46) penetrates into the forced lubrication storage oil pipe (49), the forced lubrication storage oil pipe (49) and the forced lubrication connector (46) are both provided with a forced lubrication oil channel, and the forced lubrication storage oil pipe (49) is further provided with a spraying oil channel, and the spraying oil channel is in communication with the forced lubrication oil channel.

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