CN217927011U - Gearbox of agricultural crawler tractor - Google Patents

Abstract

The utility model discloses an agricultural track tractor gearbox, which comprises an engine, the engine is connected with belt pulley clutch, belt pulley clutch is connected with high-order gear reduction case device, high-order gear reduction case device is connected with main gearbox device, main gearbox device includes the main gearbox, be provided with gearshift and drive mechanism on the main gearbox, gearshift is connected with drive mechanism, last left drive arrangement and the right drive arrangement of being provided with of drive mechanism, left side drive arrangement and right drive arrangement symmetric distribution are in on drive mechanism's the both sides. The utility model discloses its reasonable in design, simple structure, the operation is simpler and nimble, turns to convenient and reliable, can satisfy the user demand more.

Description

Gearbox of agricultural crawler tractor

Technical Field

The utility model relates to an agricultural track tractor technical field especially relates to an agricultural track tractor gearbox.

Background

The existing small agricultural walking tractor has old technology and large operation difficulty, is not accepted by users more and more, but has low price, easy maintenance and maintenance characteristic and lower use cost, and meets the requirements of farmers users. At present, related enterprises also put forward small-sized crawler tractors, but the small-sized crawler tractors are simple in structure, not applicable to paddy fields and not ideal in product strength, and particularly, the crawler chassis are not flexible in steering in the paddy fields, are easy to damage and have large damage to the fields. For the existing agricultural crawler-type tractors, the gears are shifted and steered through a crawler-type tractor gearbox, for example, the Chinese utility model patent with the publication number of CN202746504U, the gearbox of the agricultural crawler-type tractor comprises a main speed change mechanism, an auxiliary speed change mechanism, a reversing adjusting mechanism and a gear shift mechanism, and is characterized in that the main speed change mechanism is connected with the auxiliary speed change mechanism through a transmission shaft; the main gear mechanism comprises a fourth shaft and an output shaft, wherein the fourth shaft is provided with a first-gear driving gear, a second-gear driving gear, a third-gear driving gear, a fourth-gear driving gear, a first-gear meshing tooth holder, a second-gear meshing tooth holder and a third-fourth-gear meshing tooth holder, and the output shaft is provided with a first-gear driven gear, a second-gear driven gear, a third-gear driven gear and a fourth-gear driven gear; the auxiliary speed change mechanism comprises a third shaft, a high-speed driving gear and a low-speed driving gear which are arranged on the third shaft, a high-speed driven gear and a low-speed driven gear which are arranged on a high-speed and low-speed meshing gear seat and a fourth shaft, and although the gearbox with the structure can be multi-gear, the existing gear shifting structure is complex, the steering is not flexible enough, the use requirement cannot be met, and the improvement is urgently needed.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides an agricultural caterpillar tractor gearbox, its reasonable in design, simple structure, the operation is simpler, turns to more in a flexible way, destroys for a short time to the field soil layer, can have very high economic characteristics with the seamless matching of agricultural implement of hand tractor moreover, can satisfy the user demand.

(II) technical scheme to be adopted

In order to realize the purpose, the utility model adopts the technical scheme that:

the utility model provides an agricultural track tractor gearbox, includes the engine, the engine is connected with belt pulley clutch, belt pulley clutch is connected with high-order gear reduction case device, high-order gear reduction case device is connected with main gear box device, main gear box device includes main gear box, be provided with gearshift and drive mechanism on the main gear box, gearshift is connected with drive mechanism, last left drive arrangement and the right drive arrangement of being provided with of drive mechanism, left side drive arrangement and right drive arrangement symmetric distribution are in on drive mechanism's the both sides.

Preferably, the gear shifting mechanism comprises a reverse gear shaft, an input shaft and a fast gear shaft which are arranged in the main gearbox, a first speed change gear is mounted on the input shaft, a second speed change gear is mounted on the fast gear shaft, the fast gear shaft is connected with a brake shaft, a brake gear is arranged on the brake shaft, a brake ring is mounted on the brake gear, the brake shaft is connected with an eccentric device, and a hand brake can be formed by pulling the eccentric device; the first speed changing gear on the input shaft is connected with the gear on the reverse gear shaft to form a reverse gear, the first speed changing gear on the input shaft is connected with the gear on the fast gear shaft to form a first gear, and the second speed changing gear on the fast gear shaft is connected with the gear on the input shaft to form a second gear and a third gear respectively.

Preferably, the transmission mechanism comprises a shunt shaft connected with the brake shaft, the shunt shaft is connected with a speed reduction shaft, a driving shaft, a left driving device and a right driving device, and the left end and the right end of the driving shaft are correspondingly provided with the left driving device and the right driving device.

Preferably, the left driving device comprises a left differential assembly arranged at one end of the driving shaft, a left half axle bevel gear is arranged at one end of the driving shaft, a left driving half axle is connected to the left half axle bevel gear, a left driving wheel is arranged on the left driving half axle, a left steering gear is meshed with a sun gear on the left differential assembly, a left steering shaft is arranged on the left steering gear, the left steering shaft and the left steering gear are in movable fit, a left reduction gear is arranged on the left steering shaft, and the left steering shaft is connected with the left steering gear through a dog clutch structure; the right driving device comprises a right differential assembly arranged at the other end of the driving shaft and a right differential bevel gear arranged at the other end of the driving shaft, a right driving half shaft is connected to the right differential bevel gear, a right driving wheel is arranged on the right driving half shaft, a right steering gear is meshed with a sun gear on the right differential assembly, a right steering shaft is arranged on the right steering gear, the right steering shaft is in movable fit with the right steering gear, the right steering shaft is provided with a right reduction gear, and the right steering shaft is connected with the right steering gear through a tooth-embedded clutch structure.

Preferably, a left oil bath type friction plate is sleeved on the left steering gear; and the right reduction gear is sleeved with a right oil bath type friction plate.

Preferably, the left half shaft bevel gear is connected with the left driving half shaft through a left spline; the right half shaft bevel gear is connected with the right driving half shaft through a right spline.

Preferably, the left differential assembly and the right differential assembly are respectively sleeved on two ends of the driving shaft, and the left differential assembly and the right differential assembly are in movable fit with the driving shaft.

Preferably, the left half axle bevel gear and the right half axle bevel gear are respectively sleeved outside two ends of the driving shaft, and the left half axle bevel gear and the right half axle bevel gear are in movable fit with the driving shaft.

(III) the beneficial effects to be achieved

Compared with the prior art, the beneficial effects of the utility model are that:

one of the two, the utility model discloses main gear box device includes main gear box, is provided with gearshift and drive mechanism on the main gear box, and gearshift is connected with drive mechanism, last left drive arrangement and the right drive arrangement of being provided with of drive mechanism, and left drive arrangement and right drive arrangement symmetric distribution are on drive mechanism's both sides, and this kind of its reasonable in design, simple structure, and it is more simple and convenient and nimble to operate, can satisfy the user demand more. And the main gear box interface is matched with the conventional hand tractor agricultural implement interface, can be connected with the agricultural implement matched with the hand tractor, and has high economical efficiency.

And secondly, the utility model discloses steering mechanism is including setting up split stream axle and the drive shaft on main gear box, and left differential mechanism assembly, right differential mechanism assembly, left steering gear, right steering gear and arresting gear in left drive arrangement and right drive arrangement can realize that the pivot turns to and the normal position turns to (the center turns to), can adapt to each field piece, turns to more in a flexible way in anomalous field piece.

Thirdly, the utility model discloses gearshift is including setting up reverse gear axle, input shaft and the fast shelves axle in main transmission, installs change gear one on the input shaft, fast shelves epaxial change gear two of installing, fast shelves hub connection has the stopper axle, the epaxial stopper gear that is provided with of stopper, install the brake ring on the stopper gear, the stopper hub connection has eccentric device, can form the manual brake through the pulling eccentric device, this kind of simple structure, be convenient for production and manufacturing to operate more simply and nimble in the use.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the right turn state of the present invention.

Fig. 3 is a schematic view of the left turn state of the present invention.

In the figure: 1, a belt pulley clutch device; 2, a high-gear reduction box device; 3, a main gearbox device; 4, a reverse gear shaft; 5, an input shaft; 6, a fast gear shaft; 7, a brake shaft; 8, a shunt shaft; 9, a speed reducing shaft; 10, a drive shaft; 11, a right driving wheel; 12, a right drive half shaft; 13, right half-shaft bevel gear; 14, a right steering shaft; 15, right oil bath type friction plate; 16, a right steering gear; 17, a right differential assembly; 18, a right reduction gear; 19, a left reduction gear; 20, a left steering gear; 21, left oil bath friction plate; 22, a left steering shaft; 23, a left differential assembly; 24, a left drive half shaft; 25, a left drive wheel; 26, left half-shaft bevel gear.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element to which the description refers must have a specific position, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail through the accompanying drawings and embodiments. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The first embodiment is as follows: referring to fig. 1, as shown in the figure, an agricultural crawler tractor gearbox comprises an engine, the engine is connected with a belt pulley clutch device 1, the belt pulley clutch device 1 is connected with a high-order gear reduction box device 2, the high-order gear reduction box device 2 is connected with a main gearbox device 3, the main gearbox device 3 comprises a main gearbox, a gear shifting mechanism and a transmission mechanism are arranged on the main gearbox, the gear shifting mechanism is connected with the transmission mechanism, a left driving device and a right driving device are arranged on the transmission mechanism, and the left driving device and the right driving device are symmetrically distributed on two sides of the transmission mechanism.

Example two: as shown in fig. 1, on the basis of the first embodiment, the shift mechanism includes a reverse shaft 4, an input shaft 5 and a fast shaft 6 which are arranged in the main transmission, a first speed change gear is mounted on the input shaft 5, a second speed change gear is mounted on the fast shaft 6, the fast shaft 6 is connected with a brake shaft 7, the brake shaft 7 is provided with a brake gear, the brake gear is provided with a brake ring, the brake shaft 7 is connected with an eccentric device, a hand brake can be formed by pulling the eccentric device, and the brake shaft 7 is connected with the transmission mechanism; the first speed changing gear on the input shaft 5 is engaged with the gear on the reverse gear shaft 4 to form a reverse gear, the first speed changing gear on the input shaft 5 is engaged with the gear on the fast gear shaft 6 to form a first gear, and the second speed changing gear on the fast gear shaft 6 is engaged with the gear on the input shaft 5 to form a second gear and a third gear respectively. When the automatic reverse gear shifting device is used, the first speed changing gear on the input shaft 5 is shifted to be jointed with the gear on the reverse gear shaft 4 to form a reverse gear, the first speed changing gear on the input shaft 5 is shifted to be jointed with the gear on the fast gear shaft 6 to form a first gear, and the second speed changing gear on the fast gear shaft 6 is shifted to be respectively jointed with the speed changing gear on the input shaft 5 to form a second gear and a third gear.

Example three: as shown in fig. 1, on the basis of the second embodiment, the transmission mechanism includes a diversion shaft 8 connected with the brake shaft 7, the diversion shaft 8 is connected with a speed reduction shaft 9, a driving shaft 10, a left steering shaft 22 and a right steering shaft 14, and the driving bevel gears are correspondingly arranged at the left end and the right end of the driving shaft 10. When the brake is used, the brake shaft 7 is transmitted into the shunt shaft 8, and the power split by the shunt shaft 8 is transmitted into the speed reducing shaft 9, the left steering shaft 22 and the right steering shaft 14 respectively; the speed reducing shaft 9 is transmitted into a driving shaft 10, and the left driving device and the right driving device are correspondingly and fixedly arranged at the left end and the right end of the driving shaft 10, so that the left driving device and the right driving device can be driven to rotate.

Example four: as shown in fig. 1, on the basis of the third embodiment, the left driving device includes a left differential assembly 23 disposed on one end of the driving shaft 10, and a left half-shaft bevel 26 is disposed on one end of the driving shaft 10, the left half-shaft bevel 26 rotates synchronously with the driving shaft 10, a left driving half-shaft 24 is connected to the left half-shaft bevel 26, a left driving wheel 25 is disposed on the left driving half-shaft 24, a left steering gear 20 is engaged with a sun gear on the left differential assembly 23, a left steering shaft 22 is disposed on the left steering gear 20, the left steering shaft 22 and the left steering gear 20 are in a movable fit so as to be capable of rotating with each other, the left reducing gear 19 is disposed on the left steering shaft 22, and the left steering shaft 22 and the left steering gear 20 are connected through a dog clutch structure. Note that, a left oil bath type friction plate 21 is fitted over the left steering gear 20. It is also contemplated that the left side bevel 26 is connected to the left drive axle shaft 24 by a left spline.

When the separation fork pulls the left steering gear 20 to separate from the left steering shaft 22, the speed of the left steering gear 20 is reduced, the rotating speed of the sun gear of the synchronous left differential assembly 23 is also reduced, when the left steering gear 20 is further pulled, the oil bath type friction plate 21 on the left steering gear 20 can brake the left steering gear 20, the sun gear of the synchronous left differential assembly 23 is also braked, and when the separation fork is released, the spring in the left steering gear 20 can enable the left steering gear 20 to return to be connected with the left steering shaft 22.

Example five: as shown in fig. 1, on the basis of the fourth embodiment, the right driving device includes a right differential assembly 17 disposed at the other end of the driving shaft 10, and a right half-shaft bevel gear 13 is disposed at the other end of the driving shaft 10, a right driving half-shaft 12 is connected to the right half-shaft bevel gear 13, the right driving half-shaft 12 rotates synchronously with the driving shaft 10, a right driving wheel 11 is disposed on the right driving half-shaft 12, a right steering gear 16 is engaged with a sun gear on the right differential assembly 17, a right steering shaft 14 is disposed on the right steering gear 16, the right steering shaft 14 and the right steering gear 16 are in movable fit, so as to rotate with each other, and the right steering shaft 14 and the right steering gear 16 are connected through a dog clutch structure. To be specific, the right steering gear 16 is fitted with a right oil bath type friction plate 15. It is also intended to be noted that the right half shaft bevel gear 13 is connected with the right drive half shaft 12 through a right spline.

When the separation fork pulls the right steering gear 16 to separate from the right steering shaft 14, the speed of the right steering gear 16 is reduced, the rotating speed of the sun gear of the synchronous right differential assembly 17 is also reduced, the right steering gear 16 is further pulled, the right oil bath type friction plate 15 on the right steering gear 16 can brake the right steering gear 16, the sun gear of the synchronous right differential assembly 17 is also braked, and when the separation fork is released, the spring in the right steering gear 16 can enable the right steering gear 16 to return to be connected with the right steering shaft 14.

It is emphasized that the left differential assembly 23 and the right differential assembly 17 are respectively sleeved on two ends of the driving shaft 10, and the left differential assembly 23 and the right differential assembly 17 are in movable fit with the driving shaft 10, so as to be capable of rotating mutually to form differential; the left half-shaft bevel gear 26 and the right half-shaft bevel gear 13 are respectively sleeved on the outer sides of two ends of the driving shaft 10, and the left half-shaft bevel gear 26, the right half-shaft bevel gear 13 and the driving shaft 10 are in movable fit, so that the left half-shaft bevel gear and the right half-shaft bevel gear can rotate mutually. The power split by the split shaft 8 is transmitted to the left steering shaft 22, the right steering shaft 14 and the speed reducing shaft 9 respectively.

As shown in fig. 1, the power of the present invention drives the belt pulley clutch device 1 through belt connection from the engine, and the belt pulley clutch device 1 can be controlled to be engaged and disengaged through the pull rod, so as to ensure the gear shifting operation of the present invention; the power is transmitted into a high-level gear reduction box device 2 through a belt pulley clutch device 1, and then transmitted into an input shaft 5 in a gearbox device 3 while the reduction speed is obtained; the left steering shaft 22 is movably matched with the left steering gear 20 and can rotate mutually, one end of the left steering gear 20 is connected with the left steering shaft 22 through a jaw clutch structure, meanwhile, the left steering gear 20 is meshed with a sun gear of the left differential assembly 23, when a separation shifting fork shifts the left steering gear 20 to be separated from the left steering shaft 22, the speed of the left steering gear 20 is reduced, the rotating speed of the sun gear of the synchronous left differential assembly 23 is also reduced, when the left steering gear 20 is further shifted, a left oil bath type friction plate 21 on the left steering gear 20 can brake the steering gear 20, the sun gear of the synchronous left differential assembly 23 is also braked, and when the separation shifting fork is loosened, a spring in the left steering gear 20 can enable the left steering gear 20 to return to be connected with the left steering shaft 22; a right steering gear 16 on a right steering shaft 14 is movably matched with the right steering shaft 14 and can rotate mutually, one end of the right steering gear 16 is connected with the right steering shaft 14 through a jaw clutch structure, meanwhile, the right steering gear 16 is meshed with a sun gear of a right differential assembly 17, when a separation fork pulls the right steering gear 16 to separate from the right steering shaft 14, the speed of the right steering gear 16 is reduced, the rotating speed of the sun gear of the synchronous right differential assembly 17 is also reduced, a right oil bath type friction plate 15 is sleeved on the right steering gear 16, the right steering gear 16 is further pulled, the right steering gear 16 brakes, the sun gear of the synchronous right differential assembly 17 is also braked, and when the separation fork is released, a spring in the right steering gear 16 enables the right steering gear 16 to return to be connected with the right steering shaft 14.

During normal driving, the left steering shaft 22 and the right steering shaft 14 on both sides of the driving shaft 10 and the driving shaft 10 drive the corresponding left differential assembly 23 and the right differential assembly 17 to rotate at the same rotation speed and rotation direction, so that the left half-shaft bevel gear 26 and the right half-shaft bevel gear 13 also rotate at the same direction and the same speed, the left half-shaft bevel gear 26 and the right half-shaft bevel gear 13 are connected with the corresponding left driving half-shaft 24 and the right driving half-shaft 12 through splines, and the left driving wheel 25 and the right driving wheel 11 fixed on the left driving half-shaft 24 and the right driving half-shaft 12 also rotate at the same direction and the same speed.

As shown in fig. 1 and 2, when steering to the right, pulling the right steering fork to disengage the right steering gear 16 and the right steering shaft 14 causes the sun gear speed of the right differential assembly 17 to decrease, because the bevel rotation speed of the drive shaft 10 is unchanged, so that the rotation speed of the right half shaft bevel 13 is synchronously decelerated with the right driving wheel 11, and the rotation speed of the left driving wheel 25 is unchanged, thereby forming steering to the right; when the right steering fork is further pulled, the right steering gear 16 brakes to cause the sun gear of the right differential assembly 17 to brake, the right half shaft bevel gear 13 drives the right driving half shaft 12 to rotate in the same speed and in the opposite direction with the driving shaft 10, so as to drive the right driving wheel 11 to rotate in the opposite direction, the rotation direction and the advancing direction of the right driving wheel 11 are opposite, and the rotation direction and the advancing direction of the left driving wheel 25 are the same, so that right-turn home-position steering (center steering) is formed.

As shown in fig. 1 and 3, when steering to the left, pulling the left steering fork to disengage the left steering gear 20 and the left steering shaft 22 causes the sun gear speed of the left differential assembly 23 to decrease, because the bevel gear speed of the drive shaft 10 does not change, so that the left half bevel gear 26 rotates at a speed that is synchronous with the left drive wheel 25 to reduce, and the right drive wheel 11 rotates at a speed that does not change, thereby forming a left-hand steering; when the left steering fork is further pulled, the left steering gear 20 brakes to cause the sun gear of the left differential assembly 23 to brake, the left half axle bevel gear 26 drives the left driving half axle 24 to rotate reversely with the driving axle 10 at the same speed, and drives the left driving wheel 25 to rotate reversely, the rotating direction and the advancing direction of the left driving wheel 25 are opposite, and the rotating direction and the advancing direction of the right driving wheel 11 are the same, so that left-turn home-position steering (center steering) is formed.

The utility model discloses a gear design all is big modulus gear, adds the diameter of axle at thick key position, strengthens the structural strength of part like this, has improved the life-span of using. The final transmission part behind the speed change part achieves differential steering by using a double differential mechanism, the driving wheels on two sides synchronously advance or retreat when normally advancing or retreating, the driving wheels on the steering side reduce speed or stop rotating when a steering pull rod is pulled to steer to form small-radius steering or in-situ steering, and when the steering pull rod is further pulled to form braking, the driving wheels on the steering side can form reverse rotation with the advancing direction to realize in-situ steering (center steering). The utility model discloses a ripe structure, reasonable mechanical principle, main spare part realize standardization, serialization, universalization, and not only stability is good, the reliability is high, and manufacturing cost is lower moreover, and economic effect is showing, is convenient for manufacture and popularize.

The standard parts that use in this application file all can purchase from the market, and the concrete connected mode of each part all adopts conventional means such as ripe bolt, screw among the prior art, and differential mechanism internal part all adopts conventional model among the prior art, and its internal structure belongs to the prior art structure, and the workman just can accomplish according to prior art manual and carry out normal operation to it, and circuit connection adopts conventional connected mode among the prior art, does not make specific description here again.

It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.

Claims (7)

1. The utility model provides an agricultural track tractor gearbox, includes the engine, the engine is connected with belt pulley clutch (1), belt pulley clutch (1) is connected with overhead gear reduction case device (2), overhead gear reduction case device (2) are connected with main gear box device (3), its characterized in that: the main gearbox device (3) comprises a main gearbox, a gear shifting mechanism and a transmission mechanism are arranged on the main gearbox, the gear shifting mechanism is connected with the transmission mechanism, a left driving device and a right driving device are arranged on the transmission mechanism, and the left driving device and the right driving device are symmetrically distributed on two sides of the transmission mechanism.

2. An agricultural crawler tractor gearbox according to claim 1, wherein: the gear shifting mechanism comprises a reverse gear shaft (4), an input shaft (5) and a fast gear shaft (6) which are arranged in the main gearbox, a first speed change gear is installed on the input shaft (5), a second speed change gear is installed on the fast gear shaft (6), the fast gear shaft (6) is connected with a brake shaft (7), a brake gear is arranged on the brake shaft (7), a brake ring is installed on the brake gear, the brake shaft (7) is connected with an eccentric device, and a hand brake can be formed by pulling the eccentric device; the first speed changing and gear shifting gear on the input shaft (5) is connected with the gear on the reverse gear shaft (4) to form a reverse gear, the first speed changing and gear shifting gear on the input shaft (5) is connected with the gear on the fast gear shaft (6) to form a first gear, and the second speed changing and gear shifting gear on the fast gear shaft (6) is respectively connected with the gear on the input shaft (5) to form a second gear and a third gear.

3. An agricultural track tractor gearbox according to claim 2, wherein: the transmission mechanism comprises a shunting shaft (8) connected with a brake shaft (7), the shunting shaft (8) is connected with a speed reducing shaft (9), a driving shaft (10), a right steering shaft (14) and a left steering shaft (22), and the left end and the right end of the driving shaft (10) are correspondingly provided with a left driving device and a right driving device.

4. An agricultural crawler tractor gearbox according to claim 3, wherein: the left driving device comprises a left differential assembly (23) arranged at one end of the driving shaft (10), a left half shaft bevel gear (26) is arranged at one end of the driving shaft (10), a left driving half shaft (24) is connected onto the left half shaft bevel gear (26), a left driving wheel (25) is arranged on the left driving half shaft (24), a sun gear on the left differential assembly (23) is meshed with a left steering gear (20), a left steering shaft (22) is arranged on the left steering gear (20), the left steering shaft (22) is in movable fit with the left steering gear (20), the left steering shaft (22) is connected with the left steering gear (20) through a jaw clutch structure, and the left steering shaft (22) is provided with a left reduction gear (19); the right driving device comprises a right differential assembly (17) arranged at the other end of the driving shaft (10), a right differential bevel gear (13) is arranged at the other end of the driving shaft (10), a right driving half shaft (12) is connected to the right differential bevel gear (13), a right driving wheel (11) is arranged on the right driving half shaft (12), a right steering gear (16) is meshed with a sun gear on the right differential assembly (17), a right steering shaft (14) is arranged on the right steering gear (16), the right steering shaft (14) is in movable fit with the right steering gear (16), the right steering shaft (14) is connected with the right steering gear (16) through a dog clutch structure, and a right reduction gear (18) is arranged on the right steering shaft (14).

5. An agricultural track tractor gearbox according to claim 4, wherein: a left oil bath type friction plate (21) is sleeved on the left steering gear (20); and a right oil bath type friction plate (15) is sleeved on the right steering gear (16).

6. An agricultural track tractor gearbox according to claim 4, wherein: the left half axle bevel gear (26) is connected with the left driving half axle (24) through a spline; the right half shaft bevel gear (13) is connected with the right driving half shaft (12) through a spline.

7. An agricultural track tractor gearbox as claimed in claim 4 or 5 or 6, wherein: the left differential assembly (23) and the right differential assembly (17) are respectively sleeved on two ends of the driving shaft (10), and the left differential assembly (23) and the right differential assembly (17) are in movable fit with the driving shaft (10); the left half-shaft bevel gear (26) and the right half-shaft bevel gear (13) are respectively sleeved on two ends of the driving shaft (10), and the left half-shaft bevel gear (26) and the right half-shaft bevel gear (13) are in movable fit with the driving shaft (10).

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