CN114962594A

CN114962594A - Be applied to gearbox structure of miniature four-wheel drive rural area supervisor

Info

Publication number: CN114962594A
Application number: CN202210585405.0A
Authority: CN
Inventors: 冉兴洪
Original assignee: Chongqing Zhigeng Machinery Co ltd
Current assignee: Chongqing Zhigeng Machinery Co ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-08-30

Abstract

The invention relates to the technical field of four-wheel drive field managing machines, and discloses a gearbox structure applied to a miniature four-wheel drive field managing machine, which comprises an upper box body and a lower box body, wherein the upper box body is connected with the lower box body, a clutch assembly is arranged in the upper box body, a bevel gear shaft is rotatably supported in the upper box body, a bevel gear combination spline is connected on a second shaft, the bevel gear combination is transmitted to a three-shaft three-gear of a third shaft in the lower box body, power is transmitted to the third shaft from the three-shaft three-gear, a large double-linkage gear of the walking on the third shaft is respectively combined with a four-shaft two-gear and a four-shaft one-gear on the fourth shaft, the shifting function of the walking first gear and the second gear is realized, the large double-linkage gear of the walking is combined with a six-shaft large double-linkage gear of the six shafts, the reversing function is realized through the transmission of the four-shaft one-gear, the double-linkage gear of the four shaft is respectively combined with the three-shaft one-gear and the three-shaft three-gear, the walking third shaft, the gear is realized, the scheme has simple structure, the clutch can be used for multi-gear selection, the speed reduction effect is obvious, the transmission efficiency of the clutch is high, the power consumption is low, and the service life is long.

Description

Be applied to gearbox structure of miniature four-wheel drive rural area supervisor

Technical Field

The invention relates to the technical field of four-wheel-drive field management machines, in particular to a gearbox structure applied to a miniature four-wheel-drive field management machine.

Background

A field management machine is a small-sized field tillage machine mainly used for working in greenhouses, orchards and the like, is also called a universal management machine and is an agricultural machine product specially designed for working in orchards, vegetable fields, greenhouses, hilly slopes and small plots (water and dry fields).

At present, the existing miniature four-wheel drive field management machine is driven by an external belt, is subjected to straight-tooth multi-stage speed change, is linked with the walking rotation speed, cannot be controlled respectively, has few walking gears, cannot reach the ideal rotation speed, is difficult to steer, is inconvenient for field cultivation, is easy to slip due to belt transmission, has large power loss and short service life.

Therefore, based on the above technical problems, it is necessary for those skilled in the art to develop a transmission structure for a miniature four-wheel-drive field management machine.

Disclosure of Invention

The invention aims to provide a gearbox structure applied to a miniature four-wheel-drive field management machine, and aims to solve the problems that in the prior art, gear selection is few, gears cannot be controlled respectively, left and right steering is inconvenient to freely turn, field cultivation is not applicable and the like.

In order to achieve the purpose, the invention provides the following technical scheme: a gearbox structure applied to a miniature four-wheel drive field management machine comprises an upper box body and a lower box body, wherein the upper box body is connected with the lower box body, a clutch assembly is arranged in the upper box body, a bevel gear shaft is arranged on the clutch assembly, a second shaft is arranged on one side of the bevel gear shaft, a bevel gear combination is arranged on the second shaft, and a variable speed adjusting mechanism is arranged in the lower box body;

the speed change adjusting mechanism comprises three shafts arranged in the lower box body, wherein three-shaft one teeth, three-shaft two teeth, three-shaft three teeth and large walking duplex teeth are sequentially arranged on the three shafts, the three-shaft three teeth are combined and matched with the bevel gear, one side of each three shaft is provided with a four shaft, the other side of each three shaft is provided with six shafts, the four shafts are respectively provided with four-shaft duplex teeth, four-shaft one teeth, four-shaft two teeth and four-shaft triplex teeth, and the six shafts are sequentially provided with six-shaft one teeth, six-shaft small duplex teeth and six-shaft large duplex teeth;

a steering adjusting mechanism is arranged on one side of each four shaft, the steering adjusting mechanism comprises five shafts arranged in a lower box body, a first tooth of each five shaft is arranged on each five shaft, a left half shaft and a right half shaft are respectively arranged on one side of the first tooth of each five shaft, the left half shaft and the right half shaft penetrate through the lower box body and extend outwards, a walking output gear is jointly arranged on each left half shaft and each right half shaft, clutch sleeves are arranged on two sides of each walking output gear, and the two clutch sleeves are respectively connected with the left half shaft and the right half shaft;

one side of the six small duplex teeth is provided with a rotary tillage power mechanism, the rotary tillage power mechanism comprises seven shafts arranged in the lower box body, seven shafts are provided with seven first teeth and seven second teeth, one side of the seven shafts is provided with eight shafts, seven second teeth are arranged on the eight shafts, small chain wheels are arranged on the eight shafts, a hexagonal shaft penetrates through the tail of the lower box body, a middle chain wheel is arranged on the hexagonal shaft in the lower box body, and the middle chain wheel is connected with the small chain wheels through a chain.

Preferably, the two shafts, the three shafts, the four shafts, the five shafts, the left half shaft, the right half shaft, the six shafts, the seven shafts, the eight shafts and the hexagonal shaft are all rotatably connected with the box body through bearings.

Preferably, the three-shaft two teeth are matched with one six-shaft tooth, the six-shaft small duplex teeth are matched with one seven-shaft tooth, the seven-shaft two teeth are matched with one eight-shaft seven-shaft tooth, and two ends of the hexagonal shaft are connected with a driven sprocket of the rotary tillage assembly through splines, so that the functions of rotary tillage, ditching and grass discharging in forward rotation or reverse rotation can be realized.

Preferably, the large walking duplex teeth are respectively matched with two teeth of four shafts on the four shafts and one tooth of the four shafts, so that the functions of shifting gears of a first walking gear and a second walking gear are realized;

the walking large duplex teeth are matched with the six-shaft large duplex teeth of the six shafts and are transmitted by the four-shaft one-tooth to realize the reverse gear function;

the four-shaft duplex teeth are respectively matched with the three-shaft one tooth and the three-shaft three tooth, so that the functions of three-gear walking and four-gear shifting are realized.

Preferably, six steel balls are respectively arranged on two sides of the walking output gear, and the six steel balls are sequentially embedded with six R grooves in the left half shaft and the right half shaft and are controlled to be combined and separated by a clutch sleeve to control the rotation or the standstill of the left walking output shaft and the right walking output shaft.

Preferably, the clutch assembly adopts a plate friction clutch, and the bevel gear assembly is a combination of a bevel gear and a straight gear.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention relates to a gearbox structure applied to a miniature four-wheel drive field management machine, which is provided with a speed change adjusting mechanism, wherein a bevel gear shaft is rotatably supported in an upper box body, a bevel gear combination spline is connected on a second shaft, a bevel gear combination is transmitted to a three-shaft three-tooth of a third shaft in a lower box body, power is transmitted to the third shaft by the three-shaft three-tooth, a large walking duplex tooth on the third shaft is respectively combined with a two-shaft two-tooth and a four-shaft one-tooth on the fourth shaft to realize a first-gear walking and second-gear shifting function, the large walking duplex tooth is combined with a six-shaft large duplex tooth on the sixth shaft, and the large walking duplex tooth is transmitted by the four-shaft one-tooth to realize a reverse gear function, and the four-shaft duplex tooth is respectively combined with the one-shaft one-tooth and the three-shaft three-tooth to realize the third-gear walking and fourth-gear shifting functions.

(2) The invention relates to a gearbox structure applied to a miniature four-wheel-drive field management machine, which is provided with a steering adjusting mechanism, wherein a four-shaft transmits power to a five-shaft one-tooth, the five-shaft one-tooth is transmitted to a walking output gear of the walking steering mechanism, six steel balls are respectively embedded with a left half shaft and a right half shaft six R grooves at the left and right of the walking output tooth, and the rotation or the standstill of a left walking output shaft and a right walking output shaft is controlled by combining and separating through a clutch sleeve control, so that the left rotation or the right rotation is realized, the walking is embedded by the steel balls, the outer clutch sleeve is controlled, and the left half shaft R groove and the right half shaft R groove are designed, thereby solving the problem that the original four-wheel-drive field management machine is difficult to steer and separate left and right freely and can steer easily.

(3) The invention relates to a gearbox structure applied to a miniature four-wheel-drive rural area supervisor, which is provided with a rotary tillage power mechanism, wherein rotary tillage power is transmitted to six-shaft one teeth by three-shaft two teeth, rotary tillage and ditching reversing functions are transmitted to seven-shaft one teeth by six-shaft small duplex, then the seven-shaft one teeth are transmitted by seven-shaft two teeth, eight-shaft small movable chain wheels are transmitted to a middle chain wheel of a hexagonal shaft by a chain, and the hexagonal shaft is in splined connection with a rotary tillage driven chain wheel, so that the functions of rotary tillage, ditching and grass discharging in forward rotation or reverse rotation can be realized.

Drawings

FIG. 1 is a schematic view of the internal structure of the lower case of the present invention;

FIG. 2 is a schematic sectional view of the upper case of the present invention.

In the reference symbols: 1. an upper box body; 2. a clutch assembly; 3. a bevel gear shaft; 4. two axes; 5. a bevel gear assembly; 6. three axes; 7. three shafts and one tooth; 8. three shafts and two teeth; 9. three-axis and three-gear; 10. walking big duplex teeth; 11. a fourth axis; 12. four-axis double teeth; 13. four shafts and one tooth; 14. four-axis two teeth; 15. four-axis three-tooth; 16. five axes; 17. one tooth is arranged on five shafts; 18. a walking output gear; 19. a clutch sleeve; 20. a left half shaft; 21. a right half shaft; 22. six shafts; 23. one tooth is arranged on the six shafts; 24. six-axis small double teeth; 25. six-shaft large double-linkage teeth; 26. seven axes; 27. one tooth is arranged on the seven shafts; 28. seven-axis two teeth; 29. eight axes; 30. a small sprocket; 31. a hexagonal shaft; 32. a middle chain wheel; 33. and (5) a lower box body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.

Examples

Referring to fig. 1 and 2, the present invention provides a technical solution of a gearbox structure applied to a miniature four-wheel-drive field management machine: the transmission device comprises an upper box body 1 and a lower box body 33, wherein the upper box body 1 is connected with the lower box body 33, a clutch assembly 2 is arranged in the upper box body 1, specifically, the clutch assembly 2 adopts a plate type friction clutch and is connected with external power through the clutch assembly 2, a bevel gear shaft 3 is arranged on the clutch assembly 2, a secondary shaft 4 is arranged on one side of the bevel gear shaft 3, a bevel gear assembly 5 is arranged on the secondary shaft 4, specifically, the bevel gear assembly 5 is a combination of a bevel gear and a straight gear, a bevel gear part is meshed with the bevel gear shaft 3, and a variable speed adjusting mechanism is arranged in the lower box body 33 and can realize multi-gear adjustment of a transmission;

the speed change adjusting mechanism comprises a three shaft 6 arranged in the lower box body 33, a three shaft one tooth 7, a three shaft two tooth 8, a three shaft three tooth 9 and a large walking duplex tooth 10 are sequentially arranged on the three shaft 6, the three shaft three tooth 9 is matched with the bevel gear combination 5, a four shaft 11 is arranged on one side of the three shaft 6, a six shaft 22 is arranged on the other side of the three shaft 6, a four shaft duplex tooth 12, a four shaft one tooth 13, a four shaft two tooth 14 and a four shaft three tooth 15 are respectively arranged on the four shaft 11, and a six shaft one tooth 23, a six shaft small duplex tooth 24 and a six shaft large duplex tooth 25 are sequentially arranged on the six shaft 22;

in the above embodiment, power acts on the clutch assembly 2, the clutch assembly 2 outputs power, the bevel gear shaft 3 is meshed with the bevel gear assembly 5 to change the rotation direction, the bevel gear assembly 5 drives the secondary shaft 4, the straight gear part of the bevel gear assembly 5 is transmitted to the three-shaft three-teeth 9 in the lower box body 33, power is transmitted to the three-shaft 6 from the three-shaft three-teeth 9, and the large walking two-teeth 10 on the three-shaft 6 are respectively combined with the four-shaft two-teeth 14 and the four-shaft one-teeth 13 on the four-shaft 11, namely, the shifting functions of walking first gear and second gear are correspondingly realized; the walking large duplex teeth 10 are combined with the six-shaft large duplex teeth 25 of the six shaft 22 to realize a reverse gear function, and the four-shaft duplex teeth 12 are respectively combined with the three-shaft one-tooth 7 and the three-shaft three-tooth 8 to realize walking three-gear and four-gear shifting functions.

A steering adjusting mechanism is arranged on one side of the four shaft 11, the steering adjusting mechanism comprises five shafts 16 arranged in a lower box body 33, five shafts 16 are provided with five shafts one teeth 17, one side of each five shaft one tooth 17 is provided with a left half shaft 20 and a right half shaft 21 respectively, the left half shaft 20 and the right half shaft 21 penetrate through the lower box body 33 and extend outwards, the left half shaft 20 and the right half shaft 21 are provided with a walking output gear 18 together, clutch sleeves 19 are arranged on two sides of the walking output gear 18, the two clutch sleeves 19 are respectively connected with the left half shaft 20 and the right half shaft 21, specifically, two ends of the left half shaft 20 and the right half shaft 21 are respectively connected with a walking wheel assembly, and the walking wheel assembly is driven to walk by the left half shaft 20 and the right half shaft 21;

in the above embodiment, the four-shaft 11 transmits power to the five-shaft one-tooth 17, the five-shaft one-tooth 17 is transmitted to the walking output gear 18 of the walking steering mechanism, six steel balls are respectively embedded with the left and right R grooves of the left half shaft 20 and the right half shaft 21 on the left and right of the walking output tooth, and the left and right walking output shafts are controlled to rotate or stop by controlling combination and separation through the clutch sleeve 19, so that left or right turning is realized.

One side of the six-shaft small duplex gear 24 is provided with a rotary tillage power mechanism, the rotary tillage power mechanism comprises a seven shaft 26 arranged in a lower box body 33, the seven shaft 26 is provided with a seven shaft one gear 27 and a seven shaft two gear 28, one side of the seven shaft 26 is provided with an eight shaft 29, the eight shaft 29 is provided with a seven shaft two gear 28, the eight shaft 29 is provided with a small chain wheel 30, the tail part of the lower box body 33 is penetrated with a hexagonal shaft 31, the hexagonal shaft 31 positioned in the lower box body 33 is provided with a middle chain wheel 32, and the middle chain wheel 32 is connected with the small chain wheel 30 through a chain;

in the above embodiment, the rotary tillage power is transmitted to the six-shaft one-tooth 23 from the three-shaft two-tooth 8, the rotary tillage, ditching and reversing functions are transmitted to the seven-shaft one-tooth 27 of the seven-shaft 26 from the six-shaft small duplex 24, and then transmitted to the middle chain wheel 32 of the hexagonal shaft 31 from the eight-shaft 29 small movable chain wheel 30 through the chain by the transmission of the seven-shaft two-tooth 28, the hexagonal shaft 31 is connected with the driven chain wheel of the rotary tillage component through the spline, and the external rotary tillage component is driven by the hexagonal shaft 31, so that the rotary tillage, ditching and grass discharging functions in forward rotation or reverse rotation can be realized.

Referring to fig. 1 and 2, further, the two shafts 4, the three shafts 6, the four shafts 11, the five shafts 16, the left half shaft 20, the right half shaft 21, the six shafts 22, the seven shafts 26, the eight shafts 29 and the hexagonal shaft 31 are rotatably connected with the box body through bearings.

In the present embodiment, the two shafts 4, the three shafts 6, the four shafts 11, the five shafts 16, the left half shaft 20, the right half shaft 21, the six shafts 22, the seven shafts 26, the eight shafts 29 and the hexagonal shaft 31 are all driven by bearings to ensure the stability of rotation.

Referring to fig. 1 and 2, further, the three-shaft two teeth 8 are matched with the six-shaft one teeth 23, the six-shaft small duplex teeth 24 are matched with the seven-shaft one teeth 27, the seven-shaft two teeth 28 are matched with the seven-shaft one teeth 27 on the eight shafts 29, and two ends of the hexagonal shaft 31 are connected with a driven sprocket of the rotary tillage assembly through splines, so that the functions of rotary tillage, ditching and grass discharging in forward rotation or reverse rotation can be realized.

In the embodiment, the rotary tillage, ditching and grass discharging functions can be realized by driving the hexagonal shaft 31 in a forward or reverse mode, the rotary tillage and the walking rotating speed are separated and can be respectively controlled, the rotary tillage, the ditching and the grass discharging functions of the rural area management machine can be conveniently used, and the easy and reliable operation and the diversified functions are really realized.

Referring to fig. 1 and 2, further, the large walking double-link gear 10 is respectively matched with the four-shaft two teeth 14 and the four-shaft one teeth 13 on the four shaft 11 to realize the shifting function of the first and second walking gears;

the walking large duplex teeth 10 are matched with the six-shaft large duplex teeth 25 of the six shafts 22 to realize the reverse gear function;

the four-shaft double gear 12 is respectively matched with the three-shaft one gear 7 and the three-shaft three gear 9 to realize the functions of three-gear walking and four-gear shifting.

In the embodiment, the multi-gear selection can be realized by utilizing the matching among the gears, the speed reduction effect is obvious, the transmission efficiency of the clutch is high, the power consumption is low, and the service life is long.

Referring to fig. 1 and 2, six steel balls are respectively disposed on two sides of the traveling output gear 18, and the six steel balls are sequentially engaged with six R grooves in the left half shaft 20 and the right half shaft 21, and are controlled by the clutch sleeve 19 to be engaged with and disengaged from each other, so as to control the rotation or the standstill of the left and right traveling output shafts.

In the embodiment, the steel balls are embedded, the outer clutch sleeve is used for controlling, and the R grooves of the left half shaft and the right half shaft are designed, so that the problem that the original four-wheel-drive rural management machine is difficult to turn and separate is solved, and the four-wheel-drive rural management machine can turn left and right easily.

Specifically, the working principle and the using process of the invention are as follows: the power acts on the clutch assembly 2, the clutch assembly 2 outputs power, is engaged with the bevel gear combination 5 by the bevel gear shaft 3, change the direction of rotation, the bevel gear combination 5 drives the biaxial 4, the straight gear part of the bevel gear combination 5 transmits to the triaxial tridentate 9 in the lower box 33, transmit the power from the triaxial tridentate 9 to the triaxial 6, the big double tooth 10 of walking on the triaxial 6 combines with four-axis two-teeth 14, four-axis one-teeth 13 on the four-axis 11 separately, namely realize the first gear of walking, second gear shifts the function correspondingly; the walking large duplex teeth 10 are combined with the six-shaft large duplex teeth 25 of the six shaft 22 to realize a reverse gear function, and the four-shaft duplex teeth 12 are respectively combined with the three-shaft one-tooth 7 and the three-shaft three-tooth 8 to realize walking three-gear and four-gear shift functions;

the four-shaft 11 transmits power to a five-shaft one-tooth 17, the five-shaft one-tooth 17 is transmitted to a walking output gear 18 of a walking steering mechanism, six steel balls are respectively embedded with a left half shaft 20 and a right half shaft 21 on the left and the right of the walking output tooth, and the six R grooves are controlled by a clutch sleeve 19 to be combined and separated so as to control the left walking output shaft and the right walking output shaft to rotate or stand still and realize left turning or right turning;

the three-shaft two teeth 8 transmit the rotary tillage and ditching functions to the six-shaft one teeth 23, the six-shaft small duplex 24 transmits the rotary tillage and ditching functions to the seven-shaft one teeth 27 of the seven shafts 26, the eight-shaft 29 small movable chain wheel 30 transmits the rotary tillage and ditching functions to the middle chain wheel 32 of the hexagonal shaft 31 through the chain, the hexagonal shaft 31 is connected with the driven chain wheel of the rotary tillage assembly through a spline, the hexagonal shaft 31 drives the external rotary tillage assembly, and the forward rotation or reverse rotation rotary tillage, ditching and weed discharging functions can be realized until all work sequences are completed.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The gearbox structure applied to the miniature four-wheel-drive field management machine is characterized by comprising an upper box body (1) and a lower box body (33), wherein the upper box body (1) is connected with the lower box body (33), a clutch assembly (2) is arranged in the upper box body (1), an umbrella gear shaft (3) is arranged on the clutch assembly (2), a secondary shaft (4) is arranged on one side of the umbrella gear shaft (3), a bevel gear assembly (5) is arranged on the secondary shaft (4), and a variable speed adjusting mechanism is arranged in the lower box body (33);

the speed change adjusting mechanism comprises a three shaft (6) arranged in a lower box body (33), wherein a three shaft one tooth (7), a three shaft two tooth (8), a three shaft three tooth (9) and a large walking duplex tooth 10 are sequentially arranged on the three shaft (6), the three shaft three tooth (9) is matched with a bevel gear combination (5), a four shaft (11) is arranged on one side of the three shaft (6), a six shaft (22) is arranged on the other side of the three shaft (6), the four shaft (11) is respectively provided with a four shaft duplex tooth (12), a four shaft one tooth (13), a four shaft two tooth (14) and a four shaft three tooth (15), and the six shaft (22) is sequentially provided with a six shaft one tooth (23), a six shaft small duplex tooth (24) and a six shaft large duplex tooth (25);

a steering adjusting mechanism is arranged on one side of the four shaft (11), the steering adjusting mechanism comprises five shafts (16) arranged in a lower box body (33), five shafts (16) are provided with five shafts one teeth (17), one side of each five shaft one tooth (17) is provided with a left half shaft (20) and a right half shaft (21), the left half shaft (20) and the right half shaft (21) penetrate through the lower box body (33) and extend outwards, the left half shaft (20) and the right half shaft (21) are provided with a walking output gear (18) together, clutch sleeves (19) are arranged on two sides of the walking output gear (18), and the two clutch sleeves (19) are connected with the left half shaft (20) and the right half shaft (21) respectively;

one side of the six-shaft small duplex teeth (24) is provided with a rotary tillage power mechanism, the rotary tillage power mechanism comprises seven shafts (26) arranged in a lower box body (33), seven shafts (26) are provided with seven one teeth (27) and seven two teeth (28), one side of the seven shafts (26) is provided with eight shafts (29), the eight shafts (29) are provided with the seven two teeth (28), the eight shafts (29) are provided with small chain wheels (30), the tail part of the lower box body (33) is provided with hexagonal shafts (31) in a penetrating manner, the lower box body (33) is provided with middle chain wheels (32) on the hexagonal shafts (31), and the middle chain wheels (32) are connected with the small chain wheels (30) through chains.

2. The gearbox structure applied to the miniature four-wheel-drive pastoral management machine according to claim 1, wherein: the two-shaft (4), the three-shaft (6), the four-shaft (11), the five-shaft (16), the left half shaft (20), the right half shaft (21), the six-shaft (22), the seven-shaft (26), the eight-shaft (29) and the hexagonal shaft (31) are all rotationally connected with the box body through bearings.

3. The gearbox structure applied to the miniature four-wheel-drive pastoral management machine according to claim 1, wherein: the three-shaft double-tooth rotary tillage machine is characterized in that the three-shaft double teeth (8) are matched with the six-shaft one teeth (23), the six-shaft small duplex teeth (24) are matched with the seven-shaft one teeth (27), the seven-shaft double teeth (28) are matched with the seven-shaft one teeth (27) on the eight shafts (29), and two ends of the hexagonal shaft (31) are connected with a driven sprocket of a rotary tillage assembly through splines, so that the functions of rotary tillage, ditching and grass discharging in forward rotation or reverse rotation can be realized.

4. The gearbox structure applied to the miniature four-wheel-drive pastoral management machine according to claim 1, wherein: the large walking duplex teeth (10) are respectively matched with four-shaft two teeth (14) and four-shaft one teeth (13) on the four shafts (11) to realize the functions of shifting a walking first gear and a walking second gear;

the walking large duplex teeth (10) are matched with the six-shaft large duplex teeth (25) of the six shafts (22) and are transmitted by the four-shaft one-tooth (13), so that the reverse gear function is realized;

the four-shaft double-linkage teeth (12) are respectively matched with the three-shaft one-tooth (7) and the three-shaft three-tooth (9) to realize the functions of three-gear walking and four-gear shifting.

5. The gearbox structure applied to the miniature four-wheel-drive pastoral management machine according to claim 1, wherein: six steel balls are respectively arranged on two sides of the walking output gear (18), and the six steel balls are sequentially embedded with six R grooves in the left half shaft (20) and the right half shaft (21) and are controlled to be combined and separated by a clutch sleeve 19 to control the rotation or the standstill of the left and right walking output shafts.

6. The gearbox structure applied to the miniature four-wheel-drive pastoral management machine according to claim 1, wherein: the clutch assembly (2) adopts a plate type friction clutch, and the bevel gear combination (5) is a combination of a bevel gear and a straight gear.