A crawler tractor

Abstract

The present invention provides a crawler tractor. The crawler tractor includes a transmission system, which includes a diesel engine, a clutch, a transmission body, an agricultural machinery power box and a rear axle; the clutch includes a clutch shaft gear; the transmission body includes a transmission and a speed regulator, and the transmission includes a first shaft, a second shaft and a gear pair; the gear pair includes an input end gear, a gear gear and an output end gear; the speed regulator includes a sun gear, a planetary gear, a planetary carrier, a ring gear, a ring gear carrier, a speed regulating wheel and a power driver; the front end of the clutch shaft gear is meshed with the diesel engine power output interface, the rear end of the clutch shaft gear is meshed with the input end gear of the gear pair of the transmission, the output end gear of the gear pair is fixed on the second shaft, and the gear gear is rotatably mounted on the fixed shaft. The present invention solves the defects of the prior art products and resolves the drawback that it is difficult to form large-scale production of hilly and mountainous tractors.

Description

Technical Field

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

[0002] With the deepening of agricultural machinery modernization, the demand for combining agricultural machinery with agronomy has become more urgent. The technical disadvantages of existing hill crawler tractors are as follows: (i) low hydraulic transmission efficiency, high-horsepower machines do the work of low-horsepower machines; (ii) high manufacturing and use costs; (iii) low utilization rate of crawler tractors throughout the year. These defects are contrary to the policy requirements of energy conservation, consumption reduction and emission reduction. Summary of the invention

[0003] The purpose of the present invention is to provide a crawler tractor, strive to improve the cost performance and annual utilization rate of the crawler tractor, achieve high efficiency and low cost, and increase the economic and social benefits of production enterprises and users.

[0004] The technical solution of the present invention is: a crawler tractor, comprising a transmission system, wherein the transmission system comprises a diesel engine, a clutch, a transmission body, an agricultural machine power box and a rear axle;

[0005] The clutch includes clutch shaft teeth;

[0006] The speed change body includes a transmission and a speed regulator, and the transmission includes two shafts, a gear pair, and a fixed shaft;

[0007] The gear pair comprises an input end tooth, a gear tooth and an output end tooth;

[0008] The speed regulator includes a sun gear, a planetary gear, a planet carrier, a ring gear, a ring gear carrier, a speed regulating wheel and a power driver;

[0009] The front end of the clutch shaft teeth is meshed with the diesel engine power output interface, and the rear end of the clutch shaft teeth is meshed with the input end teeth of the gear pair of the transmission. The output end teeth of the gear pair are fixed on the two shafts, and the gear teeth are rotatably mounted on the fixed shaft.

[0010] The extended ends of the two shafts are fixedly provided with the sun gear of the speed regulator and the ring gear frame rotatably provided with the speed regulator; a plurality of planetary shafts are evenly distributed and fixedly provided on the planetary frame along the pitch circle, and the planetary shafts are rotatably provided with the planetary gears; the sun gear is externally meshed with the planetary gears, the planetary gears are internally meshed with the ring gears, and the ring gears are fixedly connected with the ring gear frame; the rear shaft extension of the planetary frame is rotatably provided on the partition plate of the transmission body, the shaft extension of the planetary frame is drivingly connected with the bridge teeth, the external teeth of the ring gears are externally meshed with the speed regulating wheel, and the speed regulating wheel is fixedly provided on the output shaft of the power driver;

[0011] The bridge teeth are drivingly connected to the power box of the agricultural machinery, and the power box of the agricultural machinery is drivingly connected to the rear axle to drive the rear axle to output walking power.

[0012] Preferably, the transmission body further comprises a clutch gear, a fixed gear, a sliding gear, a power gear pair and a reverse gear;

[0013] The bridge teeth are triple teeth of large, medium and small, wherein the large tooth end is provided with internal teeth; the large teeth of the bridge teeth are slidingly externally meshed with the clutch teeth, the medium teeth are externally meshed with the reversing wheel, and the small teeth are slidingly internally meshed with the sliding teeth slidably mounted on the input shaft of the agricultural machinery power box; the clutch teeth are also slidingly externally meshed with the reversing wheel; the sliding teeth are also slidingly externally meshed with the passive teeth of the power gear pair; the clutch teeth are slidably mounted on the front part of the rear axle of the agricultural machinery power box, and the front end of the clutch teeth is also provided with internal teeth, which are slidingly internally meshed with the fixed teeth; the fixed teeth are fixedly mounted on the housing of the transmission body; the rear axle of the agricultural machinery power box is drivingly connected to the rear axle to drive the rear axle to output walking power.

[0014] Preferably, the agricultural machinery power box includes an input shaft, input teeth, output teeth, a rear axle and coupling teeth, the rear end of the rear axle is provided with small bevel teeth meshing with the large bevel teeth of the rear axle; the front end of the input shaft is rotatably mounted in the inner hole of the small tooth end of the bridge teeth, and the rear end of the input shaft extends into the agricultural machinery power box and is fixedly mounted with input teeth; the input teeth mesh with the coupling teeth, and the coupling teeth are rotatably mounted on the rear axle and mesh with the output teeth; the power output shaft of the rear axle is fixedly mounted in the shaft extension hole of the output teeth.

[0015] Preferably, the rear axle includes a large bevel gear, a driving gear, a passive gear, a brake gear, a half shaft, a brake, a power output shaft, a running gear and a differential;

[0016] The differential includes differential gears, a cross shaft, a planetary shaft, planetary gears, a differential lock, a lock pin and a steering member;

[0017] The back of the large bevel gear is provided with a plurality of lock pin holes for installing lock pins distributed along the pitch circle; the large bevel gear is fixedly mounted coaxially with the differential housing; a transverse shaft is fixedly mounted in the center hole of the differential housing; the planetary gear is rotatably mounted on the planetary shaft, and the planetary shaft is symmetrically fixedly mounted on the housing of the differential; the differential gears are arranged on the left and right sides, and are all rotatably mounted on the transverse shaft and meshed with the planetary gears; the active gears are rotatably mounted on the left and right ends of the transverse shaft and correspondingly meshed with the end face keys of the left and right differential gear tail ends; the spline shaft extension part of the active gear on the right side of the rear axle is slidably meshed with the internal spline of the differential lock; the passive gear of the rear axle is fixedly mounted on the half shaft and meshed with the active gear, and the extended end of the half shaft is connected to the walking system; the active gear is also meshed with the brake gear at the same time, and the brake gear is fixedly mounted on the shaft of the brake, and a steering member is mounted on the shaft of the brake on the left side, and the outer shell of the brake is fixedly mounted on the housing of the rear axle.

[0018] Preferably, the steering member comprises a steering gear, a steering shaft and a bevel gear pair;

[0019] The transmission also includes a power take-off, which includes a power take-off shaft and a power take-off gear pair;

[0020] The input end of the power take-off gear pair of the power take-off is meshed with the gear teeth, the power take-off shaft is fixedly installed in the inner hole of the output end gear of the power take-off gear pair, and the power gear pair is fixedly installed in the middle of the power take-off shaft; the active teeth of the power gear pair are large and small connected teeth, wherein the small teeth are meshed with the steering teeth of the steering component, the steering teeth are slidably mounted on the front end of the steering shaft, and the rear end of the steering shaft is fixed with a bevel gear pair; the front end of the steering shaft is rotatably mounted in the inner hole of the small tooth end of the active tooth of the power gear pair.

[0021] Compared with the related art, the present invention has the following beneficial effects:

[0022] 1. The transmission system of the present invention breaks the traditional tractor design constraints, and uses a combination of automobile standard gearbox + functional unit to achieve a multi-type chassis layout. It resolves the problem that enterprises find it difficult to organize large-scale production under the circumstances of large differences in demand for hilly tractors and self-propelled agricultural machinery chassis, small batches, and a shortage of product standards, resulting in high manufacturing costs and high use costs;

[0023] Second, the rear power confluence infinitely variable speed technology of the present invention adopts the energy-saving and quality-improving idea of ​​adjusting the output of high-power flow with low-power power flow, which solves the embarrassment of high cost and low working efficiency of power transmission models that have long troubled enterprises; and the technical conflict that the power torque of the rear power confluence is small and cannot meet the high torque output of the tractor transmission system terminal. While improving efficiency and reducing costs, the tractor's walking speed and the working speed of agricultural machinery can adopt the infinitely variable speed solution of electric or other power sources;

[0024] Third, the present invention adopts the side-drive on-the-spot steering technology, which is not only direct and efficient, but also greatly reduces the manufacturing cost and use cost of crawler tractors compared to the hydraulic system dual-motor driven on-the-spot steering technology;

[0025] Fourth, the bidirectional driving function of the present invention improves the ability of the tractor to adapt to agronomic needs;

[0026] 5. The implementation of the above technologies gives tractors the ability to perform mechanized operations throughout the entire process, greatly improving the annual utilization rate of agricultural machinery and equipment. The technology of the present invention focuses on energy conservation, consumption reduction and emission reduction throughout the entire process, and the tractor is used with high efficiency and low consumption, injecting greenness into the entire life cycle. It has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of the transmission system of the crawler tractor provided by the present invention;

[0028] Figure 2 for Figure 1 An enlarged schematic diagram of the speed regulator in FIG. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0030] like Figure 1 As shown, a crawler tractor provided in this embodiment includes a transmission system, and the transmission system includes a diesel engine 1, a clutch 2, a transmission body 4, an agricultural machinery power box 6, and a rear axle 7.

[0031] The clutch 2 includes a clutch shaft gear 21; the rear axle 7 includes a large bevel gear 71, a driving gear 72, a driven gear 73, a brake gear 74, a half shaft 76, a brake 77, a power output shaft 78, a running system 79, and a differential 711. The differential consists of a differential gear 7111, a transverse shaft 7112, a planetary gear 7114, a planetary shaft 7113, a differential lock 75, a lock pin 751, and a steering component 710. The steering component 710 consists of a steering gear 7101, a steering shaft 7102, and a bevel gear pair 7103.

[0032] The transmission body 4 includes an automobile transmission, hereinafter referred to as a transmission 41 , a speed regulator 42 , a bridge gear 43 , a clutch gear 44 , a fixed gear 45 , a sliding gear 46 , a power gear pair 47 and a counter gear 48 .

[0033] The transmission 41 includes two shafts 412, a gear pair 413, a power take-off 414, and a fixed shaft 415. The gear pair 413 includes an input end tooth 4131, a gear tooth 4132, and an output end tooth 4133. The power take-off 414 is composed of a power take-off shaft 4141 and a power take-off gear pair 4142.

[0034] The speed regulator 42 includes a sun gear 421, planetary gears 422, a planetary carrier 423, a ring gear 424, a ring gear carrier 425, a speed regulating wheel 426, and a power driver 427 (an electric motor or other power drivers may be selected).

[0035] The agricultural machinery power box 6 includes an input shaft 61 , input gears 62 , output gears 63 , a rear shaft 64 , and coupling gears 65 .

[0036] The clutch 2 is mounted on the transmission clutch shaft gear 21, and the front end spline shaft head of the clutch shaft gear 21 is meshed with the internal spline of the power output interface of the diesel engine 1. The rear end teeth of the clutch shaft gear 21 are meshed with the input end teeth 4131 of the gear pair 413 of the transmission 41, and the output end teeth 4133 of the gear pair 413 are fixedly mounted on the second shaft 412, and the gear teeth 4132 are rotatably mounted on the fixed shaft 415.

[0037] like Figure 2 As shown, the extended ends of the two shafts 412 are fixedly provided with the sun gear 421 of the speed regulator 42 and the ring gear carrier 425 on which the speed regulator 42 is rotatably provided. Several planetary shafts 4231 are evenly distributed and fixedly provided on the planetary carrier 423 along the pitch circle, and the planetary shafts 4231 are rotatably provided with the planetary gears 422. The sun gear 421 is externally meshed with the planetary gears 422, and the planetary gears 422 are internally meshed with the ring gear 424, and the ring gear 424 is fixedly connected with the ring gear carrier 425. The rear axle extension of the planetary carrier 423 is rotatably provided on the partition of the transmission body 4. The axle extension of the planetary carrier 423 is drivingly connected with the bridge gear 43. The external teeth of the ring gear 424 are externally meshed with the speed regulating wheel 426, and the speed regulating wheel 426 is fixedly provided on the output shaft of the electric motor or other power driver 427.

[0038] The bridge teeth 43 are triple teeth of large, medium and small, and the large teeth are also provided with internal teeth. The large teeth of the bridge teeth 43 are slidably meshed with the clutch teeth 44, wherein the teeth are externally meshed with the reverse wheel 48, and the small teeth are slidably meshed with the sliding teeth 46 slidably mounted on the input shaft 61. The clutch teeth 44 are also slidably meshed with the reverse wheel 48. The sliding teeth 46 are also slidably meshed with the passive teeth of the power gear pair 47. The clutch teeth 44 are slidably mounted on the front of the rear axle 64, and the front end of the clutch teeth 44 is also provided with internal teeth, which are slidably meshed with the fixed teeth 45, and the fixed teeth 45 are fixedly mounted on the housing of the transmission body 4. The rear end of the rear axle 64 is provided with small bevel teeth and meshes with the large bevel teeth 71 of the rear axle 7.

[0039] The back of the large bevel gear 71 is provided with a plurality of lock pin holes for installing the lock pin 751 distributed along the pitch circle. The large bevel gear 71 is fixedly mounted coaxially with the differential 711 housing, and a transverse shaft 7112 is fixedly mounted in the center hole of the differential 711 housing. The planetary gear 7114 is rotatably mounted on the planetary shaft 7113, and the planetary shaft 7113 is symmetrically fixed on the differential 711 housing. The differential gear 7111 arranged on the left and right is rotatably mounted on the transverse shaft 7112 and meshes with the planetary gear 7114. The driving gear 72 is rotatably mounted on the left and right ends of the transverse shaft 7112 and meshes with the end face key of the tail end of the differential gear 7111 arranged on the left and right ends. The spline shaft extension part of the driving gear 72 on the right side of the rear axle 7 is slidably meshed with the inner spline of the differential lock 75. The passive gear 73 of the rear axle 7 is fixed on the left / right half shaft 76 and meshes with the active gear 72. The extended end of the half shaft 76 is connected to the running system 79. Figure 1 As shown, the driving tooth 72 is also meshed with the brake tooth 74, and the brake tooth 74 is fixed on the shaft of the brake 77. A bevel gear pair 7103 is also fixedly mounted on the shaft of the left brake 77, and the housing of the brake 77 is fixedly mounted on the housing of the rear axle 7.

[0040] like Figure 1 As shown, the input end of the power take-off gear pair 4142 of the power take-off 414 is meshed with the gear position gear 4132, the power take-off shaft 4141 is fixedly mounted in the inner hole of the output end gear of the power take-off gear pair 4142, and the power gear pair 47 is fixedly mounted in the middle of the power take-off shaft 4141. The driving teeth of the power gear pair 47 are large and small coupled teeth, and the small teeth thereof are meshed with the steering teeth 7101 of the steering member 710, and the steering teeth 7101 are slidably mounted on the front end of the steering shaft 7102, and the rear end of the steering shaft 7102 is fixedly mounted with a bevel gear pair 7103. The front end of the steering shaft 7102 is rotatably mounted in the inner hole of the small tooth end of the driving teeth of the power gear pair 47.

[0041] like Figure 1 As shown, the sliding teeth 46 also engage with the passive teeth of the power gear pair 47. The front end of the input shaft 61 is rotatably mounted in the inner hole of the small tooth end of the bridge tooth 43, and the rear part extends into the agricultural machinery power box 6 and is fixedly mounted with the input teeth 62. The input teeth 62 of the agricultural machinery power box 6 engage with the coupling teeth 65, and the coupling teeth 65 are rotatably mounted on the rear shaft 64 and engage with the output teeth 63. The rear power output shaft 78 is fixedly mounted in the shaft extension hole of the output teeth 63.

[0042] (I) Power input path:

[0043] like Figure 1 As shown, the diesel engine 1 is started, the clutch 2 is placed in the engaged position, the clutch shaft gear 21 is driven by power, the rear end gear of the clutch shaft gear 21 is meshed with the input end gear 4131 of the gear gear pair 413 of the transmission 41, and the gear gear pair 413 is driven through the input end gear 4131 of the transmission 41. In addition, the gear teeth 4132 of the gear gear pair 413 are rotatably mounted on the fixed shaft 415, and the output end gear 4133 is fixedly mounted on the second shaft 412, so that the second shaft 412 is driven by the output end gear 4133.

[0044] like Figure 1 , Figure 2 As shown, the sun gear 421 of the speed regulator 42 is fixedly mounted on the extended end of the two shafts 412, and the ring gear frame 425 of the speed regulator 42 is rotatably mounted. A plurality of planetary shafts 4231 are evenly fixedly mounted on the planetary frame 423 along the pitch circle, and the planetary shafts 4231 are rotatably mounted with the planetary gears 422. The sun gear 421 is externally meshed with the planetary gears 422, and the planetary gears 422 are internally meshed with the ring gear 424. The external teeth of the ring gear 424 are externally meshed with the speed regulating wheel 426, and the speed regulating wheel 426 is fixedly mounted on the output shaft of the electric motor or other power driver 427.

[0045] like Figure 1 , Figure 2As shown, the second shaft 412 drives the sun gear 421 connected thereto, and then the planetary gear 422 is driven. The planetary gear 422 drives the ring gear 424 meshing therewith and drives the ring gear carrier 425, while causing the planetary carrier 423 to rotate around the center line of the sun gear 421 axis; the planetary carrier 423 then drives the bridge gear 43 connected thereto.

[0046] When the clutch gear 44 is moved to engage with the large teeth of the bridge gear 43, the clutch gear 44 rotates immediately. The clutch gear 44 drives the rear axle 64 connected to the clutch gear, and the rear end of the rear axle 64 is provided with a small bevel gear, which then drives the large bevel gear 71 of the rear axle 7 engaged with the clutch gear 44.

[0047] like Figure 1 As shown, the large bevel gear 71 is fixedly mounted coaxially with the housing of the differential 711. The transverse shaft 7112 is fixedly mounted with the center hole of the housing of the differential 711, the planetary gear 7114 is rotatably mounted on the planetary shaft 7113, the planetary shaft 7113 is symmetrically fixedly mounted on the housing of the differential 711, and the left and right differential gears 7111 are rotatably mounted on the transverse shaft 7112 and meshed with the planetary gear 7114. In this way, the rotating large bevel gear 1 drives the transverse shaft 7112, the differential 711, and the planetary shaft 7113 at the same time. The planetary shaft 7113 drives the planetary gear 7114 to drive the left and right differential gears 7111 meshed with it. The driving gear 72 meshed with the tail key of the left and right differential gears 7111 rotates accordingly. Because the driving gear 72 is also meshed with the passive gear 73 and the brake gear 74 at the same time, the driving gear 72 drives the passive gear 73 and the brake gear 74 meshed with it at the same time. The passive gear 73 in turn drives the left / right half shaft 76 fixed thereto to deliver travel power to the travel system 79, thereby enabling the tractor to travel in the forward direction.

[0048] When the clutch gear 44 is engaged with the middle teeth of the bridge gear 43 through the reverse wheel 48, the reverse wheel 48 driven by the bridge gear 43 immediately drives the clutch gear 44 to rotate in the reverse direction, and drives the rear axle 64 connected to it to rotate in the reverse direction. After that, the power flows through the same path as above and is transmitted to the running system 39 / 79 on the half shaft 36 / 76, so that the tractor can drive in the reverse direction.

[0049] (II) Driving braking and anti-skid principles:

[0050] like Figure 1 As shown, a force F is applied to the brake 77, and the brake tooth 74 fixed on the spline of the inner shaft of the brake 77 is acted upon by the braking force applied by the spline, and is decelerated or braked, and through the active tooth 72 meshing with it, the passive tooth 73 is constrained to brake the half shaft 76, so that the travel system 79 fixedly mounted on the half shaft 76 is decelerated or braked.

[0051] When the running gear on one side of the tractor slips, Figure 1As shown, the differential lock 75 is moved toward the direction of the large bevel gear 71 so that the lock pin 751 on it is inserted into the pin hole on the back of the bevel gear 71. At this time, the large bevel gear 71, the right active gear 72 and the right differential gear 7111 meshed with the tail key of the right active gear 72 realize synchronous rotation, and the planetary gear 7114 meshed with the right differential gear 7111 and the left differential gear 7111 lock the left active gear 72 to rotate synchronously with it, thereby solving the unilateral slip of the travel system and improving the passability of the whole machine. When the F force is applied to the left or right brake 77 respectively, the travel system 79 on the side receiving the force is decelerated or braked, and the travel system 79 on the other side travels around the travel system 79 on the side receiving the force at a speed faster than the speed of the side receiving the force, so as to realize the left and right steering of the tractor.

[0052] (III) Principle of power infinitely variable speed:

[0053] like Figure 1 , Figure 2 As shown, the outer teeth of the ring gear 424 of the speed regulator 42 are meshed with the speed regulating wheel 426, and the speed regulating wheel 426 is fixed on the output shaft of the electric motor or other power driver 427.

[0054] Remove the braking force f, start the power driver 427 (electric motor), and the speed regulating wheel 426 is driven by the output shaft of the power driver 427, and drives the planetary gear 422 by meshing with the ring gear 424. At this time, the planetary gear 422 driven by the sun gear 421 is driven by the ring gear 424, and at the same time, the planetary carrier 423 is driven; when the two power flows introduced by the sun gear 421 and the ring gear 424 rotate in the same direction, the planetary carrier 423 rotates faster. When the two power flows rotate in opposite directions, the planetary carrier 423 rotates slower. The planetary carrier 423 drives the bridge teeth 43 connected to the drive. The large, medium and small teeth of the bridge teeth 43 respectively drive the clutch teeth 44, the reverse wheel 48 and the sliding teeth 46 meshed with the drive. Subsequently, the power flow path is the same as that described above, and finally the tractor is driven continuously and the agricultural machinery power is output continuously. Since the ring gear 44 is in a floating transmission in the structure of the present invention and bears little torque, the purpose of changing a large power flow with a small power flow can be achieved. When the motor or other power driver 427 is stopped and a braking force f is applied to its output shaft or the speed regulating wheel 426, the ring gear 44 is locked by the speed regulating wheel 426, and the planet carrier 423 resumes normal mechanical speed change.

[0055] (IV) Power flow path of agricultural machinery: Figure 1 As shown, when the middle teeth of the gear pair 413 of the transmission 41 drive the power take-off gear pair 4142 of the power take-off 414 meshing therewith, the output teeth of the power take-off gear pair 4142 drive the power take-off shaft 4141 connected thereto, and the power gear pair 47 fixed on the power take-off shaft 4141 starts to operate.

[0056] like Figure 1 As shown, the sliding tooth 46 is moved to mesh with the passive tooth of the power gear pair 47, and the power gear pair 47 drives the sliding tooth 46 and the input shaft 61 installed therein, and the input shaft 61 then drives the input tooth 62 connected to the driving thereof, and the input tooth 62 drives the coupling tooth 65 meshed therewith. Since the coupling tooth 65 is rotatably mounted on the rear shaft 64, the coupling tooth 65 drives the output tooth 63 meshed therewith, and the output tooth 63 drives the power output shaft 78 connected therewith, providing multiple gears of "standard speed" for the rear-mounted agricultural implement.

[0057] When the sliding tooth 46 is engaged with the small tooth of the bridge tooth 43, the input shaft 61 drives the input tooth 62 fixed thereto, and the subsequent transmission path is the same as above. At this time, the power output shaft 78 provides the rear agricultural implement with a rotation speed that changes synchronously with the travel rotation speed.

[0058] (V) Side drive on-the-spot turning:

[0059] The input end of the power take-off gear pair 4142 of the power take-off 414 meshes with the gear teeth 4132, and the output end of the power take-off gear pair 4142 is fixedly mounted with a power take-off shaft 4141, and the rear end of the power take-off shaft 4141 is fixedly mounted with a driving gear of the power gear pair 47. The driving gear of the power gear pair 47 is a large and small coupled gear, and its small gear is internally meshed with the steering gear 7101 of the steering member 710, and the steering gear 7101 is slidably mounted on the front end of the steering shaft 7102, and the rear end of the steering shaft 7102 is fixedly mounted with a bevel gear pair 7103. The front end of the steering shaft 7102 is rotatably mounted in the inner hole of the small gear end of the driving gear of the power gear pair 47.

[0060] like Figure 1As shown, when the clutch gear 44 is moved forward to mesh with the fixed gear 45 fixed on the housing of the transmission body 4, the clutch gear 44 is locked and constrained to lock the rear axle 64 fixed thereto. The rear axle 64 then locks the large bevel gear through the small bevel gear thereon. Because the large bevel gear 71 is fixed coaxially with the housing of the differential 711. And because the transverse shaft 7112 is fixed in the center hole of the housing of the differential 711. Therefore, the housing and the transverse shaft 7112 of the differential 711 are locked. At this time, the steering gear 7101 is moved to mesh with the small gear of the driving gear of the power gear pair 47, and the steering shaft 7102 rotates accordingly. The steering shaft 7102 drives the bevel gear pair 7103 fixed thereon, and the bevel gear pair 7103 drives the inner shaft of the left brake 77 through its output end bevel gear, and the inner shaft of the left brake 77 drives the left brake gear 74 fixed thereon. The left brake tooth 74 drives the left driving tooth 72 meshing with it. The left driving tooth 72 in turn drives the left differential tooth 7111 meshing with the tail end key. Since the housing of the differential 711 has been locked, the left differential tooth 7111 drives the planetary tooth 7114 meshing with it to rotate on the planetary shaft 7113. At this time, the planetary tooth 7114 drives the right differential tooth 7111 meshing with it to rotate in the opposite direction. The right differential tooth 7111 in turn drives the right driving tooth 72 meshing with the tail end key to rotate in the opposite direction. At this point, the left driving tooth 72 and the right driving tooth 72 drive the left and right walking systems 79 to rotate in opposite directions through the passive teeth 73 meshing with them with torques in opposite directions, causing the left and right crawlers to rotate as shown below. Figure 1 Drive in the direction indicated by the arrow to achieve "on-the-spot turning" of the tractor.

[0061] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A crawler tractor, comprising a transmission system, characterized in that: The transmission system comprises a diesel engine (1), a clutch (2), a transmission body (4), an agricultural machinery power box (6) and a rear axle (7); The clutch (2) comprises clutch shaft teeth (21); The transmission body (4) comprises a transmission (41) and a speed regulator (42); the transmission (41) comprises two shafts (412), a gear position gear pair (413), and a fixed shaft (415); The gear position gear pair (413) comprises an input end tooth (4131), a gear position tooth (4132) and an output end tooth (4133); The speed regulator (42) comprises a sun gear (421), planetary gears (422), a planet carrier (423), a ring gear (424), a ring gear carrier (425), a speed regulating wheel (426), and a power driver (427); The front end of the clutch shaft tooth (21) meshes with the power output interface of the diesel engine (1), and the rear end of the clutch shaft tooth (21) meshes with the input end tooth (4131) of the gear gear pair (413) of the transmission (41), the output end tooth (4133) of the gear gear pair (413) is fixed on the second shaft (412), and the gear tooth (4132) is rotatably mounted on the fixed shaft (415); The extended ends of the two shafts (412) are fixedly provided with a sun gear (421) of a speed regulator (42) and a gear ring frame (425) rotatably provided with the speed regulator (42); a plurality of first planetary shafts (4231) are evenly distributed and fixedly provided along a pitch circle on the planetary frame (423); planetary gears (422) are rotatably provided on the first planetary shafts (4231); the sun gear (421) is externally meshed with the planetary gears (422); the planetary gears (422) are (422) is internally meshed with the ring gear (424), and the ring gear (424) is fixedly connected to the ring gear frame (425); the rear shaft extension of the planetary frame (423) is rotatably mounted on the partition of the transmission body (4), and the shaft extension of the planetary frame (423) is drivingly connected to the bridge teeth (43); the external teeth of the ring gear (424) are externally meshed with the speed regulating wheel (426), and the speed regulating wheel (426) is fixedly mounted on the output shaft of the power driver (427); The transmission body (4) further comprises a clutch tooth (44), a fixed tooth (45), a sliding tooth (46), a power gear pair (47) and a reverse gear (48); The bridge teeth (43) are triple teeth of large, medium and small, wherein the large teeth are provided with internal teeth; the large teeth of the bridge teeth (43) are externally meshed with the clutch teeth (44) in a sliding manner, the medium teeth are externally meshed with the reversing wheel (48), and the small teeth are internally meshed with the sliding teeth (46) slidably mounted on the input shaft (61) of the agricultural machinery power box (6); the clutch teeth (44) are also externally meshed with the reversing wheel (48); the sliding teeth (46) are also externally meshed with the passive teeth of the power gear pair (47); the clutch teeth (44) are slidably mounted on the front of the rear axle (64) of the agricultural machinery power box (6), and the front end of the clutch teeth (44) is also provided with internal teeth, which are internally meshed with the fixed teeth (45); the fixed teeth (45) are fixedly mounted on the housing of the transmission body (4); The rear axle (64) of the agricultural machinery power box (6) is drivingly connected to the rear axle (7) to drive the rear axle (7) to output traveling power.

2. The crawler tractor according to claim 1, characterized in that: The agricultural machinery power box (6) comprises an input shaft (61), input teeth (62), output teeth (63), a rear shaft (64) and coupling teeth (65); a rear end of the rear shaft (64) is provided with a small bevel tooth meshing with a large bevel tooth (71) of a rear axle (7); a front end of the input shaft (61) is rotatably mounted in an inner hole of a small tooth end of a bridge tooth (43); a rear end of the input shaft (61) extends into the agricultural machinery power box (6) and is fixedly mounted with an input tooth (62); the input tooth (62) meshes with the coupling teeth (65); the coupling teeth (65) are rotatably mounted on the rear shaft (64) and meshes with the output teeth (63); a power output shaft (78) of the rear axle (7) is fixedly mounted in the shaft extension hole of the output tooth (63).

3. The crawler tractor according to claim 1, characterized in that: The rear axle (7) comprises a large bevel gear (71), a driving gear (72), a driven gear (73), a brake gear (74), a half shaft (76), a brake (77), a power output shaft (78), a running gear (79) and a differential (711); The differential (711) comprises a differential gear (7111), a transverse shaft (7112), a second planetary shaft (7113), planetary gears (7114), a differential lock (75), a lock pin (751) and a steering member (710); The back side of the large bevel gear (71) is provided with a plurality of lock pin holes for installing a lock pin (751) distributed along the pitch circle; the large bevel gear (71) is fixedly mounted coaxially with the differential (711) housing; a transverse shaft (7112) is fixedly mounted in the center hole of the differential (711) housing; the planetary gear (7114) is rotatably mounted on the second planetary shaft (7113), and the second planetary shaft (7113) is symmetrically fixedly mounted on the differential (711) housing; the differential gear (7111) is arranged on the left and right sides, and is rotatably mounted on the transverse shaft (7112) and meshes with the planetary gear (7114); the driving gear (72) is rotatably mounted on the left and right ends of the transverse shaft (7112) and meshes with the planetary gear (7114); The rear end face key of the left and right differential teeth (7111) is meshed with each other; the spline shaft extension of the driving tooth (72) on the right side of the rear axle (7) is slidably meshed with the internal spline of the differential lock (75); the passive tooth (73) of the rear axle (7) is fixedly mounted on the half shaft (76) and meshes with the driving tooth (72); the outer extension end of the half shaft (76) is connected to the running system (79); the driving tooth (72) is also meshed with the brake tooth (74); the brake tooth (74) is fixedly mounted on the shaft of the brake (77); a steering member (710) is mounted on the shaft of the brake (77) on the left side; the outer shell of the brake (77) is fixedly mounted on the housing of the rear axle (7).

4. The crawler tractor according to claim 3, characterized in that: The steering component (710) comprises a steering tooth (7101), a steering shaft (7102) and a bevel gear pair (7103); The transmission (41) further comprises a power take-off (414), wherein the power take-off (414) comprises a power take-off shaft (4141) and a power take-off gear pair (4142); The input end of the power take-off gear pair (4142) of the power take-off (414) meshes with the gear position gear (4132); the power take-off shaft (4141) is fixedly mounted in the inner hole of the output end gear of the power take-off gear pair (4142); the middle of the power take-off shaft (4141) is fixedly mounted with a power gear pair (47); the driving teeth of the power gear pair (47) are large and small coupled teeth, wherein the small teeth mesh with the steering teeth (7101) of the steering member (710); the steering teeth (7101) are slidably mounted on the front end of the steering shaft (7102); the rear end of the steering shaft (7102) is fixedly mounted with a bevel gear pair (7103); the front end of the steering shaft (7102) is rotatably mounted in the inner hole of the small tooth end of the driving teeth of the power gear pair (47).

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