A tracked vehicle transmission system

Abstract

The invention discloses a transmission system for a tracked vehicle, comprising: a housing; a first walking shaft, on which second-gear driving gears, first-gear driving gears, fourth-gear driving gears and third-gear driving gears are arranged in sequence; a second walking shaft, on which second-gear driven gears, first-gear driven gears, second-shaft double-linked gears and third-gear driven gears are arranged in sequence; a transmission shaft; a first-stage planetary reducer, on one side of the first-stage planetary reducer there is a second-stage planetary reducer; a first steering shaft; and a second steering shaft. The beneficial effects are: the hydraulic transmission drive mode is adopted to simplify the speed change system and reduce the overall size of the vehicle. At the same time, the design of the second-stage planetary reducer and the steering structure is adopted to realize the convergence differential, thereby reducing the turning radius of the vehicle, so as to adapt to the harsh use environment in the farmland. The left and right crawlers are synchronously driven to transmit power, which can avoid asynchronous driving between crawlers when going straight, and improve the high-speed straight-moving ability of the agricultural machinery.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery transmission systems, and in particular to a crawler vehicle transmission system. Background Art

[0002] Since most of the farmlands in southern my country are located in mountainous or hilly areas, the planting environment of crops is mostly paddy fields. The area of ​​paddy fields is relatively small, while the size of agricultural machinery is relatively large. When operating in paddy fields, there are often large restrictions on the turning radius of agricultural machinery. Traditional agricultural machinery uses bilateral separate drive for transmission during turning. Usually, a transmission structure is installed on each side of the track separately, and turning is achieved by controlling the rotation speed between different tracks separately.

[0003] However, the main problem with this turning method is that the left and right track wheels are driven independently, and usually a dual-pump dual-motor method is used for power output. The speed adjustment range is small, and a large differential cannot be generated when turning, which will make the turning radius of the agricultural machinery larger when turning, and the efficiency when turning is low, which is not suitable for the farmland environment. At the same time, the two sides of the track are driven independently, and the transmission structure inevitably has misalignment errors, which will cause the tracked vehicle to deviate laterally when it is moving straight, affecting the normal driving of the vehicle. In addition, the transmission efficiency is low, and it is not suitable for high-speed movement of agricultural machinery. Summary of the invention

[0004] The purpose of the present invention is to provide a tracked vehicle transmission system in order to solve the above problems, so as to solve the technical problems that the agricultural machinery in the prior art adopts the independent drive mode of left and right tracks, the speed adjustment range is small, the steering differential is insufficient, and the turning radius is large, which affects the turning efficiency. At the same time, this transmission structure is prone to lateral deflection during the straight-line driving of the vehicle, and is not suitable for the high-speed movement of agricultural machinery. Among the many technical solutions provided by the present invention, the preferred technical solution adopts a hydraulic transmission drive mode, simplifies the speed change system, and reduces the overall size of the vehicle. At the same time, the design of a two-stage planetary reducer with a steering structure can achieve a convergence differential, thereby reducing the turning radius of the vehicle, so as to adapt to the harsh use environment in the farmland, and adopts the synchronous drive mode of the left and right tracks for power transmission, which can avoid asynchronous driving between the tracks and improve the high-speed straight-line ability of the agricultural machinery. The technical effect is described in detail below.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The tracked vehicle transmission system provided by the present invention comprises:

[0007] A box body, a gearbox cover body is provided above the box body;

[0008] A travel shaft is rotatably mounted in the box body, and a travel hydraulic motor for driving the travel shaft to rotate is arranged on the outer wall of the box body. A second gear driving gear, a first gear driving gear, a fourth gear driving gear and a third gear driving gear are arranged in sequence on the travel shaft. An engagement seat is arranged between the fourth gear driving gear and the third gear driving gear. An engagement sleeve is sleeved on the outer side of the engagement seat, and a shift fork is arranged on the top of the engagement sleeve;

[0009] A second travel shaft is arranged in parallel on one side of the first travel shaft, and a second-gear driven tooth, a first-gear driven tooth, a second-shaft double-linked tooth, and a third-gear driven tooth are arranged on the second travel shaft in sequence, and the second-gear driving tooth, the first-gear driving tooth, the fourth-gear driving tooth, and the third-gear driving tooth on the first travel shaft are respectively meshed with the second-gear driven tooth, the first-gear driven tooth, the second-shaft double-linked tooth, and the third-gear driven tooth on the second travel shaft, and a meshing seat 2 is provided between the second-gear driven tooth and the first-gear driven tooth, and a meshing sleeve 2 is sleeved on the outside of the meshing seat 2, and a shift fork 2 is provided on the top of the meshing seat 1;

[0010] The transmission shaft is arranged in the housing, and a sun gear input tooth meshing with the duplex teeth of the second shaft is fixedly installed in the middle of the transmission shaft. The power of the transmission shaft is output to the drive shaft after being reduced by the primary planetary reducer and the secondary planetary reducer;

[0011] A first-stage planetary reducer is arranged on both sides of the box body, and a second-stage planetary reducer is arranged on one side of the first-stage planetary reducer;

[0012] A steering shaft is rotatably mounted at the bottom of the box body. A steering hydraulic motor is provided on the side wall of the box body to drive the steering shaft to rotate. The steering shaft is parallel to the first travel shaft and the second travel shaft. A steering power input gear is provided on the steering shaft.

[0013] The second steering shaft is rotatably installed inside the box and is parallel to the first steering shaft. Steering teeth are provided at both ends of the second steering shaft, and reverse teeth matching the steering teeth are provided on the inner wall of the box. Steering power output teeth matching the steering power input teeth are provided in the middle of the second steering shaft.

[0014] Preferably, the first-stage planetary reducer includes a rotating ring gear, a sun gear shaft 1, a planet carrier 1, and a planetary gear 1. The rotating ring gear is rotatably mounted on the outer wall of the casing, and gear teeth are provided on the outer wall and inner wall of the rotating ring gear. The planet carrier 1 is arranged in the rotating ring gear, and the planetary gear 1 is rotatably mounted in the planet carrier 1. The sun gear shaft 1 is arranged inside the planet carrier 1, and the planetary gear 1 is meshed with the sun gear shaft 1 and the rotating ring gear. The outer wall of the rotating ring gear is provided with a planetary reducer housing.

[0015] Preferably, the two-stage planetary reducer includes a fixed ring gear, a second sun gear shaft, a second planet carrier, and a second planetary gear. The fixed ring gear is arranged on one side of the planetary reducer housing, and gear teeth are arranged on the inner wall of the fixed ring gear. The second planet carrier is arranged in the fixed ring gear, and the second planetary gear is rotatably installed in the second planet carrier. The second sun gear shaft is arranged inside the second planet carrier, and the second planetary gear is meshed with the second sun gear shaft and the fixed ring gear.

[0016] Preferably, a half-axle tube is sleeved on the outer side of the drive shaft.

[0017] Preferably, a fork mounting hole for mounting the first and second forks is provided on the outer wall of the box body.

[0018] The beneficial effects are:

[0019] It adopts a hydraulic transmission drive mode, without the need for a transmission, which reduces the overall size of the vehicle. At the same time, the use of a two-stage planetary reducer combined with a steering structure design can achieve convergence differential speed, thereby reducing the turning radius of the vehicle to adapt to the harsh operating environment in farmland. The left and right tracks are driven synchronously for power transmission, which can avoid synchronous driving between the tracks and improve the high-speed straight-line capability of the agricultural machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The three-dimensional structure of the present invention is Figure 1 ;

[0022] Figure 2 The three-dimensional structure of the present invention is Figure 2 ;

[0023] Figure 3 This is a three-dimensional structural view of the walking mechanism of the present invention. Figure 1 ;

[0024] Figure 4 The three-dimensional structure of the walking mechanism of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 5 The three-dimensional structure of the walking mechanism of the present invention is shown in FIG. Figure 3 ;

[0026] Figure 6 The three-dimensional structure of the steering mechanism of the present invention is shown in FIG. Figure 4 ;

[0027] Figure 7 The three-dimensional structure of the steering mechanism of the present invention is shown in FIG. Figure 5 ;

[0028] Figure 8 This is the internal structure of the first-stage planetary reducer of the present invention. Figure 1 ;

[0029] Fig. 9 This is the internal structure of the first-stage planetary reducer of the present invention. Figure 2 ;

[0030] Fig.10 This is the internal structure of the first-stage planetary reducer of the present invention. Figure 3 .

[0031] The following are the descriptions of the reference numerals:

[0032] 1. Axle tube; 2. Travel hydraulic motor; 3. Bearing cover; 4. Motor seat; 5. Box; 6. Transmission cover; 7. Steering hydraulic motor; 8. Parking brake; 9. Right drive wheel; 10. Fork mounting hole; 11. First-stage planetary reducer; 1101. Rotating ring gear; 1102. Sun gear shaft 1; 1103. Planet carrier 1; 1104. Planet gear 1; 12. Wheel brake; 13. Second-stage planetary reducer; 1301. Planet carrier 2; 1302. Planet gear 2; 1303. Fixed ring gear; 1304. Sun gear shaft 2; 14. Left drive wheel; 15. Drive shaft; 16. Drive Flange; 17, shift fork 1; 18, shift fork 2; 19, third gear driven gear; 20, travel shaft 2; 21, second shaft duplex gear; 22, sun gear input gear; 23, first gear driven gear; 24, meshing sleeve 2; 25, meshing seat 2; 26, second gear driven gear; 27, travel shaft 1; 28, second gear driving gear; 29, first gear driving gear; 30, fourth gear driving gear; 31, meshing sleeve 1; 32, meshing seat 1; 33, third gear driving gear; 34, steering power output gear; 35, steering gear; 36, transmission shaft; 37, reverse gear; 38, steering shaft 2; 39, steering shaft 1; 40, steering power input gear. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] See also Figure 1-Figure 10As shown, the present invention provides a tracked vehicle transmission system, comprising:

[0035] The box body 5 is provided with a gearbox cover body 6 above the box body 5, and the gearbox cover body 6 is fixed to the box body 5 by bolts for sealing the box body 5;

[0036] The first travel shaft 27 is rotatably mounted in the box body 5 through a bearing. A travel hydraulic motor 2 is provided on the outer wall of the box body 5 to drive the first travel shaft 27 to rotate. It should be noted that the travel hydraulic motor 2 is a prior art, used to provide driving force, and is a part of a hydrostatic transmission system. There are mature products on the market, which will not be described in detail here. The travel hydraulic motor 2 is connected to the first travel shaft 27 in transmission, and can drive the first travel shaft 27 to rotate. The first travel shaft 27 is provided with second gear driving teeth 28, first gear driving teeth 29, fourth gear driving teeth 30 and third gear driving teeth 33 arranged in sequence. A meshing seat 32 is provided between the fourth gear driving gear 30 and the third gear driving gear 33, a meshing sleeve 31 is sleeved on the outer side of the meshing seat 32, and a shift fork 17 is provided on the top of the meshing sleeve 31. Four gears are set according to different gear ratios, so as to control the speed of the sun gear input gear 22 to meet different walking requirements, such as low speed and high torque in muddy environment, high speed and low torque on flat road surface, etc. When in use, by adjusting the position of the shift fork 17, the shift fork 17 can be driven to push the meshing sleeve 31 to move left and right. It should be noted that the first gear driving gear The first gear driving gear 29 and the second gear driving gear 28 are both connected to the first travel shaft 27 in transmission, and the fourth gear driving gear 30 and the third gear driving gear 33 are rotatably mounted on the first travel shaft 27 through the shaft sleeve and can rotate freely. The fourth gear driving gear 30 and the third gear driving gear 33 are both extended outward to have a gear structure that matches the meshing seat 1 32, so that the meshing sleeve 1 31 can connect and mesh the meshing seat 1 32 with the gear structure. When the shift fork 17 is in the middle position, the meshing sleeve 1 31 below is located above the meshing seat 1 32 and does not mesh with the fourth gear driving gear 30 and the third gear driving gear 33 on both sides. 3 meshes with each other, is in a neutral state, and has no power input. When the meshing sleeve 1 31 moves left and right, the meshing seat 1 32 can mesh with the fourth gear driving gear 30 and the third gear driving gear 33 respectively, thereby realizing power transmission, and then controlling the transmission power to be introduced into the third gear driven gear 19 and the second shaft double-linked gear 21 through the fourth gear driving gear 30 and the third gear driving gear 33, and finally drives the second travel shaft 20 to rotate, and rotates through the second shaft double-linked gear 21 on the second travel shaft 20, and finally drives the sun gear input gear 22 and the transmission shaft 36 to rotate together, thereby realizing power transmission;

[0037] The second travel shaft 20 is arranged in parallel on one side of the first travel shaft 27. The second gear driven gear 26, the first gear driven gear, the second shaft double gear 21 and the third gear driven gear 19 are arranged in sequence on the second travel shaft 20. The second gear driving gear 28, the first gear driving gear 29, the fourth gear driving gear 30 and the third gear driving gear 33 on the first travel shaft 27 are respectively meshed with the second gear driven gear 26, the first gear driven gear, the second shaft double gear 21 and the third gear driven gear 19 on the second travel shaft 20. A small gear meshing with the fourth gear driving gear 30 and a large gear meshing with the sun gear input gear 22 are respectively provided. A meshing seat 25 is provided between the second gear driven gear 26 and the first gear driven gear. A meshing sleeve 24 is sleeved on the outside of the meshing seat 25. A shift fork 2 18 is provided on the top of the meshing seat 1 32. The first gear driven gear and the second gear driven gear 26 are also rotatably mounted on the second travel shaft 20 through the shaft sleeve and can rotate freely. The third gear driven gear 19 and the second shaft double-linked gear 21 are connected to the second travel shaft 20. Transmission connection, wherein, on the two-shaft double-linked teeth 21, the first gear driven teeth and the second gear driven teeth 26 are both extended outwardly to form a gear tooth structure that matches the meshing seat 25, so that the meshing sleeve 24 can connect and mesh the meshing seat 25 with the gear tooth structure. When the shift fork 18 is in the middle position, the lower meshing sleeve 24 is located above the meshing seat 25, and does not mesh with the gear tooth structure on the first gear driven teeth and the second gear driven teeth 26 on both sides, and is in a neutral state, and there is no movement. Force input, when the meshing sleeve 24 moves left and right, the meshing seat 25 can mesh with the first gear driven teeth and the second gear driven teeth 26 respectively, so as to realize power transmission, and then control the transmission power to be introduced into the first gear driven teeth and the second gear driven teeth 26 through the first gear driving teeth 29 and the second gear driving teeth 28, and finally drive the second travel shaft 20 to rotate. At this time, the second shaft double-linked teeth 21 rotate with the second travel shaft 20, and then can drive the sun gear book input teeth to rotate, so as to realize the driving of the transmission shaft 36;

[0038] The transmission shaft 36 is arranged in the housing 5. The sun gear input teeth 22 meshing with the two-shaft duplex teeth 21 are fixedly installed in the middle of the transmission shaft 36. The power of the transmission shaft 36 is derived to the drive shaft 15 after the reduction transmission of the primary planetary reducer 11 and the secondary planetary reducer 13. There are two drive shafts 15, which are symmetrically arranged on both sides of the housing 5. There are two primary planetary reducers 11 and two secondary planetary reducers 13 respectively. The drive shaft 15 on each side is transmission-connected with the primary planetary reducer 11 and the secondary planetary reducer 13, so as to realize power transmission after deceleration.

[0039] The primary planetary reducer 11 is arranged on both sides of the housing 5, and a secondary planetary reducer 13 is arranged on one side of the primary planetary reducer 11. The primary planetary reducer 11 and the secondary planetary reducer 13 can reduce the power on the transmission shaft 36, increase the torque and then export it, and finally import it to the left and right driving wheels 9 respectively to cooperate with the equipment drive;

[0040] A steering shaft 39 is rotatably mounted at the bottom of the box body 5. A steering hydraulic motor 7 is provided on the side wall of the box body 5 to drive the steering shaft 39 to rotate. It should be noted that the steering hydraulic motor 7 is also a prior art, used to provide driving force, and is a part of a hydrostatic transmission system. There are mature products on the market, which will not be described in detail here. The steering hydraulic motor 7 is fixedly mounted on the side wall of the box body 5 by bolts, and is parallel to the first travel shaft 27 and the second travel shaft 20. A steering power input tooth 40 is provided on the steering shaft 39;

[0041] The second steering shaft 38 is rotatably mounted inside the housing 5 and is parallel to the first steering shaft 39. Steering teeth 35 are arranged at both ends of the second steering shaft 38. Reverse teeth 37 cooperating with the steering teeth 35 are arranged on the inner wall of the housing 5. A steering power output tooth 34 cooperating with the steering power input tooth 40 is arranged in the middle of the second steering shaft 38. When steering is in operation, the steering hydraulic motor 7 can drive the first travel shaft 27 to rotate, and then the power of the first steering shaft 39 is introduced into the second steering shaft 38 through the meshing transmission of the steering power input tooth 40 and the steering power output tooth 34, so that the steering teeth 35 at both ends of the second steering shaft 38 rotate together with the second steering shaft 38, and the reverse teeth 37 are used to input the power of the same speed but different directions into the primary planetary reducer 11 on both sides of the housing 5, so as to cooperate with the differential rotation;

[0042] The first-stage planetary reducer 11 includes a rotating ring gear 1101, a sun gear shaft 1102, a planet carrier 1103, and a planet gear 1104, which is an internal structure. The first-stage planetary reducer 11 also includes a mounting housing 1 for covering the internal structure for protection. A bearing that cooperates with the rotating ring gear 1101 is provided inside the mounting housing, so that the rotating ring gear 1101 can rotate inside the mounting housing to facilitate the transmission of steering power. The rotating ring gear 1101 is rotatably mounted on the outer wall of the box body 5. Gear teeth are provided on the outer wall and the inner wall of the rotating ring gear 1101. The planet carrier 1103 is arranged in the rotating ring gear 1101. The planet gear 1104 The sun gear shaft 1102 is arranged inside the planetary carrier 1103, the planetary gear 1104 is meshed with the sun gear shaft 1102 and the rotating ring gear 1101, and the outer wall of the rotating ring gear 1101 is provided with a planetary reducer housing. It should be noted that the transmission shaft 36 is inserted into the sun gear shaft 1102 and is connected to the sun gear shaft 1102 for transmission, and then the sun gear shaft 1102 is meshed with the planetary gear 1104 for transmission, thereby driving the planetary carrier 1103 to rotate, and finally the power is exported to the sun gear shaft 2 1304 in the secondary planetary reducer 13 through the planetary carrier, which is the first-stage reduction.

[0043] The two-stage planetary reducer 13 includes a fixed ring gear 1303, a second sun gear shaft 1304, a second planet carrier 1301, and a second planet gear 1302. The fixed ring gear 1303 is arranged on one side of the planetary reducer housing. One end of the second sun gear shaft 1304 is connected to the first planet carrier 1103 for transmission so as to extract the power after deceleration. The other end of the second sun gear shaft 1304 extends into the second planet carrier 1301 and meshes with the second planet gear 1302 for transmission, and finally extracts the power through the second planet carrier 1301. One end of the drive shaft 15 extends into the second planet carrier 1301, and the other end of the drive shaft 15 is connected to the drive wheel. The inner wall of the fixed ring gear 1303 is provided with gear teeth, and the second planet carrier 1301 is arranged on the fixed ring gear 1303. Inside, the planetary gear 2 1302 is rotatably installed in the planetary carrier 2 1301, the sun gear shaft 2 1304 is arranged inside the planetary carrier 2 1301, the planetary gear 2 1302 is meshed with the sun gear shaft 2 1304 and the fixed gear ring 1303, when the internal power of the first-stage planetary reducer 11 is extracted from the planetary carrier 1 1103, the planetary carrier 1 1103 drives the sun gear shaft 2 1304 to rotate, so that the sun gear shaft 2 1304 is meshed with the planetary gear 2 1302 inside the planetary carrier 2 1301 for transmission, and under the action of the fixed gear ring 1303, the power is further decelerated to be extracted from the planetary carrier 2 1301, at this time, the driving shaft 15 inside the planetary carrier 2 1301 will drive the driving wheel to rotate, so as to realize the power output after deceleration;

[0044] When traveling straight, the travel hydraulic motor 2 works to drive the travel shaft 1 27 to rotate. When the agricultural machine moves forward in the first gear, the shift fork 2 18 is shifted to drive the meshing sleeve 2 24 to move toward the first gear driven tooth direction. At this time, the meshing sleeve 24 is connected with the first gear driven tooth and the meshing seat 2 25, and the power on the travel shaft 1 27 is introduced from the first gear driving tooth 29 to the first gear driven tooth, and the meshing sleeve 24 and the meshing seat 2 25 are meshed and driven to introduce the power on the first gear driven tooth to the travel shaft 20. At this time, the large gear on the second shaft double gear 21 on the travel shaft 20 drives the sun gear input tooth 22 and the transmission shaft 36 to rotate together, which is the first gear travel power.

[0045] When the agricultural machine moves forward in the second gear, the shift fork 218 is shifted to drive the meshing sleeve 24 to move toward the second gear driven tooth direction. At this time, the meshing sleeve 24 is connected with the second gear driven tooth and the meshing seat 25, and the power on the first travel shaft 27 is introduced from the second gear driving tooth to the second gear driven tooth. The meshing sleeve 24 and the meshing seat 25 are meshed and transmitted to introduce the power on the second gear driven tooth to the second travel shaft 20. At this time, the second shaft duplex teeth 21 on the second travel shaft 20 work to drive the sun gear input teeth 22 and the transmission shaft 36 to rotate together. This is the second gear travel power.

[0046] When the agricultural machine moves forward in the third gear, the shift fork 17 is shifted to drive the meshing sleeve 131 to move toward the third gear driven tooth direction. At this time, the meshing sleeve 131 is connected with the third gear driven tooth and the meshing seat 132, and the power on the travel shaft 1 27 is introduced from the third gear driving tooth to the third gear driven tooth, and the meshing sleeve 131 and the meshing seat 132 are meshed and transmitted to introduce the power on the third gear driven tooth to the travel shaft 20. At this time, the large gear on the second shaft double gear 21 on the travel shaft 20 drives the sun gear input tooth 22 and the transmission shaft 36 to rotate together, which is the three-speed travel power.

[0047] When the agricultural machine moves forward in the fourth gear, the shift fork 17 is shifted to drive the meshing sleeve 131 to move toward the fourth gear driven tooth direction. At this time, the meshing sleeve 131 is connected with the fourth gear driven tooth and the meshing seat 132, and the power on the travel shaft 1 27 is introduced from the fourth gear driving tooth to the small gear on the second shaft double gear 21, and the meshing sleeve 131 is meshed with the meshing seat 25 to directly drive the travel shaft 20 and the second shaft double gear 21 to rotate together, so that the large gear on the second shaft double gear 21 drives the sun gear input tooth 22 and the transmission shaft 36 to rotate together, which is the fourth gear travel power;

[0048] When the power is introduced into the primary planetary reducer 11, since the steering hydraulic motor 7 is in a stationary state in the straight driving state, the first steering shaft 39 and the second steering shaft 38 are both in a fixed state, the reverse gear 37 and the rotating ring gear 1101 that are meshed with the steering gear 35 are in a fixed state, and the sun gear input gear 22 drives the transmission shaft 36 to rotate, and the transmission shaft 36 is meshed with the planetary gear 1104 inside the planet carrier 1103, and the planetary gear rotates inside the rotating ring gear 1101, and finally the power is transmitted to the first planetary reducer 11. The power is exported through the planet carrier 1103, and the initial deceleration is completed at this time. At the same time, the sun gear shaft 1304 installed inside the planet carrier 1103 rotates, and the power is introduced to the planet gear 1302 inside the fixed gear ring 1303, and the planet gear 1302 rotates inside the fixed gear ring 1303, and finally the power is exported through the planet carrier 1301 to achieve secondary deceleration. Finally, the drive shaft 15 installed inside the planet carrier 1301 drives the left and right drive wheels 9 to rotate in the same direction to achieve straight forward movement;

[0049] When steering, the steering hydraulic motor 7 works to drive the steering shaft 1 39 to rotate, and the steering shaft 2 is driven to rotate through the meshing transmission of the steering power input gear 40 and the steering power output gear 34. Since the outer wall of one of the first-stage planetary reducers 11 is provided with a reverse gear 37, the steering gears 35 at both ends of the second steering shaft 38 are respectively meshed with the reverse gear 37 and the rotating gear ring 1101, so that the power output on the second steering shaft 38 can be reversely introduced into the two rotating gear rings 1101, so as to cooperate to realize differential rotation. Therefore, the rotating gear rings 1101 inside the two first-stage planetary reducers 11 1 has opposite rotation direction, and can be combined with the power input during the straight-line process. At this time, there are two power input sources inside the first-stage planetary reducer 11, namely the sun gear shaft 1102 and the rotating ring gear 1101. The power introduced by the sun gear shaft 1102 is the same, while the power of the rotating ring gear 1101 is just opposite. After merging inside the first-stage planetary reducer 11, a differential is generated, which makes the power introduced into the second-stage planetary reducer 13 have a difference, and finally makes the power acting on the drive shaft 15 different, realizing the differential rotation of the left and right drive wheels 9, thereby realizing the steering of the agricultural machinery.

[0050] In another embodiment, a half-axle tube 1 is sleeved on the outer side of the driving shaft 15 , and the half-axle tube 1 is fixed to the outer wall of the shell of the secondary planetary reducer 13 by bolts to protect the driving shaft 15 .

[0051] In another embodiment, a fork mounting hole 10 for mounting the first fork 17 and the second fork 18 is provided on the outer wall of the housing 5. The design of the fork mounting hole 10 facilitates positioning of the fork during installation, thereby reducing the difficulty of installation.

[0052] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tracked vehicle transmission system, Features: include: A box body (5), wherein a gearbox cover body (6) is provided above the box body (5); A first travel shaft (27) is rotatably mounted in the box body (5); a travel hydraulic motor (2) is provided on the outer wall of the box body (5) for driving the first travel shaft (27) to rotate; a second gear driving tooth (28), a first gear driving tooth (29), a fourth gear driving tooth (30) and a third gear driving tooth (33) are arranged in sequence on the first travel shaft (27); an engagement seat (32) is provided between the fourth gear driving tooth (30) and the third gear driving tooth (33); an engagement sleeve (31) is sleeved on the outer side of the engagement seat (32); and a shift fork (17) is provided on the top of the engagement sleeve (31); A second travel shaft (20) is arranged in parallel on one side of the first travel shaft (27); a second gear driven tooth (26), a first gear driven tooth (23), a second shaft double-linked tooth (21) and a third gear driven tooth (19) are arranged in sequence on the second travel shaft (20); the second gear driving tooth (28), the first gear driving tooth (29), the fourth gear driving tooth (30) and the third gear driving tooth (33) on the first travel shaft (27) are respectively meshed with the second gear driven tooth (26), the first gear driven tooth (23), the second shaft double-linked tooth (21) and the third gear driven tooth (19) on the second travel shaft (20); a second meshing seat (25) is provided between the second gear driven tooth (26) and the first gear driven tooth (23); a second meshing sleeve (24) is sleeved on the outside of the second meshing seat (25); and a second shift fork (18) is provided on the top of the first meshing seat (32); A transmission shaft (36) is disposed in the housing (5), wherein a sun gear input tooth (22) meshing with the two-shaft duplex tooth (21) is fixedly mounted in the middle of the transmission shaft (36), and the power of the transmission shaft (36) is output to the drive shaft (15) after being reduced by the primary planetary reducer and the secondary planetary reducer (13); A first-stage planetary reducer is arranged on both sides of the housing (5), and a second-stage planetary reducer (13) is arranged on one side of the first-stage planetary reducer; A first steering shaft (39) is rotatably mounted on the bottom of the box body (5); a steering hydraulic motor (7) for driving the first steering shaft (39) to rotate is provided on the side wall of the box body (5), and is parallel to the first traveling shaft (27) and the second traveling shaft (20); a steering power input gear (40) is provided on the first steering shaft (39); The second steering shaft (38) is rotatably mounted inside the housing (5) and is parallel to the first steering shaft (39). Steering teeth (35) are provided at both ends of the second steering shaft (38). A reverse tooth (37) cooperating with one of the steering teeth (35) is provided on the inner wall of the housing (5). The first-stage planetary reducer (11) comprises a rotating ring gear (1101). The steering teeth (35) at both ends of the second steering shaft (38) are respectively meshed with the reverse tooth (37) and the rotating ring gear (1101), so that the power output from the second steering shaft (38) is reversely introduced into the rotating ring gears (1101) of the two first-stage planetary reducers. A steering power output tooth (34) cooperating with the steering power input tooth (40) is provided at the middle of the second steering shaft (38).

2. The tracked vehicle transmission system according to claim 1, Its characteristics are: The first-stage planetary reducer (11) comprises a rotating ring gear (1101), a sun gear shaft (1102), a planet carrier (1103), and a planet gear (1104); the rotating ring gear (1101) is rotatably mounted on the outer wall of the housing (5); gear teeth are provided on the outer wall and the inner wall of the rotating ring gear (1101); the planet carrier (1103) is arranged in the rotating ring gear (1101); the planet gear (1104) is rotatably mounted in the planet carrier (1103); the sun gear shaft (1102) is arranged in the interior of the planet carrier (1103); the planet gear (1104) is meshed with the sun gear shaft (1102) and the rotating ring gear (1101); and a planetary reducer housing is mounted on the outer wall of the rotating ring gear (1101).

3. The tracked vehicle transmission system according to claim 2, Its characteristics are: The two-stage planetary reducer (13) comprises a fixed ring gear (1303), a second sun gear shaft (1304), a second planet carrier (1301), and a second planet gear (1302); the fixed ring gear (1303) is arranged on one side of the planetary reducer housing; the inner wall of the fixed ring gear (1303) is provided with gear teeth; the second planet carrier (1301) is arranged in the fixed ring gear (1303); the second planet gear (1302) is rotatably mounted in the second planet carrier (1301); the second sun gear shaft (1304) is arranged in the interior of the second planet carrier (1301); and the second planet gear (1302) is meshed with the second sun gear shaft (1304) and the fixed ring gear (1303).

4. The tracked vehicle transmission system according to claim 1, Its characteristics are: A half-axle tube (1) is sleeved on the outer side of the drive shaft (15).

5. The tracked vehicle transmission system according to claim 1, Its characteristics are: The outer wall of the box body (5) is provided with a shift fork mounting hole (100) for mounting the first shift fork (17) and the second shift fork (18).

Images