A gearbox structure used in a miniature four-wheel drive farmland management machine

Abstract

The invention relates to the technical field of four-wheel drive farmland management machines, and discloses a gearbox structure applied to a micro four-wheel drive farmland management machine, comprising an upper case body and a lower case body, wherein the upper case body is connected to the lower case body, and a clutch assembly is arranged in the upper case body, a bevel gear shaft is rotatably supported in the upper case body, a bevel gear combination is splined on two shafts, the bevel gear combination is transmitted to three shafts and three teeth of three shafts in the lower case body, power is transmitted from three shafts and three teeth to three shafts, large double-linked teeth for travel on three shafts are respectively combined with two teeth of four shafts and one tooth of four shafts on four shafts, so as to realize the first gear and second gear shifting function of travel, large double-linked teeth for travel are combined with six large double-linked teeth of six shafts, and a reverse gear function is realized through transmission of one tooth of four shafts, and when the double-linked teeth of four shafts are respectively combined with one tooth of three shafts and three teeth of three shafts, the third gear and fourth gear shifting function of travel is realized, and the scheme has a simple structure, can provide multiple gear selections, has obvious deceleration effect, has high clutch transmission efficiency, low power consumption and long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of four-wheel drive farmland management machines, and in particular to a gearbox structure applied to a miniature four-wheel drive farmland management machine. Background Art

[0002] A garden management machine refers to a small garden tillage machine mainly used for operations in greenhouses, orchards, etc. A garden management machine with a differential is also called a universal management machine. It is an agricultural machinery product specially designed for operations in orchards, vegetable fields, greenhouses, hilly slopes and small plots of land (water and dry fields).

[0003] At present, the existing micro four-wheel drive farm management machine is driven by an external belt, through a straight-tooth multi-stage speed change, and the rotary tillage and travel speeds are linked and cannot be controlled separately. There are few travel gears, and the ideal speed cannot be reached. Steering is difficult, which is not convenient for field farming. In addition, the belt drive is prone to slippage, the power loss is large, and the service life is short.

[0004] Therefore, based on the above technical problems, it is necessary for technicians in this field to develop a gearbox structure for use in a micro four-wheel drive farm management machine. Summary of the invention

[0005] The purpose of the present invention is to provide a gearbox structure applied to a miniature four-wheel drive farm management machine, so as to solve the problems in the prior art of few gear options, inability to control gears separately, inconvenient left and right steering, and unsuitability for field farming.

[0006] To achieve the above object, the present invention provides the following technical solutions: a gearbox structure applied to a miniature four-wheel drive farmland management machine, comprising an upper case and a lower case, wherein the upper case is connected to the lower case, and a clutch assembly is arranged in the upper case, a bevel gear shaft is arranged on the clutch assembly, two shafts are arranged on one side of the bevel gear shaft, a bevel gear assembly is arranged on the two shafts, and a speed adjustment mechanism is arranged in the lower case;

[0007] The speed adjustment mechanism includes three shafts arranged in the lower case, the three shafts are provided with three shafts with one tooth, three shafts with two teeth, three shafts with three teeth and large double teeth for travel in sequence, the three shafts with three teeth cooperate with the bevel gear combination, one side of the three shafts is provided with four shafts, the other side of the three shafts is provided with six shafts, the four shafts are provided with four shafts with double teeth, four shafts with one tooth, four shafts with two teeth and four shafts with three teeth, the six shafts are provided with six shafts with one tooth, six shafts with small double teeth and six shafts with large double teeth in sequence;

[0008] A steering adjustment mechanism is provided on one side of the four-axis, and the steering adjustment mechanism includes a five-axis arranged in the lower box body, and a five-axis one-tooth is provided on the five-axis, and a left half-axis and a right half-axis are provided on one side of the five-axis one-tooth, respectively, and the left half-axis and the right half-axis penetrate the lower box body and extend outward, and the left half-axis and the right half-axis are jointly provided with a travel output gear, and clutch sleeves are provided on both sides of the travel output gear, and the two clutch sleeves are connected to the left half-axis and the right half-axis respectively;

[0009] A rotary tillage power mechanism is provided on one side of the six-axis small double-tooth, and the rotary tillage power mechanism includes seven shafts arranged in the lower box body, and the seven shafts are provided with seven shafts with one tooth and seven shafts with two teeth. An eight shaft is provided on one side of the seven shafts, and the eight shafts are provided with seven shafts with two teeth. A small sprocket is provided on the eight shafts, and a hexagonal shaft is passed through the tail of the lower box body, and a middle sprocket is provided on the hexagonal shaft located in the lower box body, and the middle sprocket is connected to the small sprocket by a chain.

[0010] Preferably, the two-axis, three-axis, four-axis, five-axis, left half-axis, right half-axis, six-axis, seven-axis, eight-axis and hexagonal axis are all rotatably connected to the box through bearings.

[0011] Preferably, the two teeth on the three axes cooperate with the one tooth on the six axes, the small double teeth on the six axes cooperate with the one tooth on the seven axes, the two teeth on the seven axes cooperate with the one tooth on the seven axes on the eight axes, and the two ends of the hexagonal axis are connected to the driven sprocket of the rotary tillage assembly through splines, so as to realize the functions of forward or reverse rotary tillage, furrowing and grassing.

[0012] Preferably, the large double-linked gear for traveling cooperates with the second gear of the fourth shaft and the first gear of the fourth shaft respectively, so as to realize the first gear and the second gear shifting function for traveling;

[0013] The large double gears for traveling cooperate with the large double gears for the six axes, and are transmitted by one gear for the four axes to realize the reverse gear function;

[0014] The four-axis double-tooth cooperates with the three-axis one-tooth and the three-axis three-tooth respectively to realize the three-speed and four-speed shifting functions.

[0015] Preferably, six steel balls are provided on both sides of the travel output gear, and the six steel balls are sequentially engaged with the six R grooves in the left and right half shafts, and the clutch sleeve controls the engagement and separation to control the rotation or stillness of the left and right travel output shafts.

[0016] Preferably, the clutch assembly adopts a plate friction clutch, and the bevel gear combination is a combination of a bevel gear and a spur gear.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention is a gearbox structure applied to a micro four-wheel drive farm management machine, which is provided with a speed adjustment mechanism, wherein the bevel gear shaft is rotatably supported in the upper housing, the bevel gear combination is splined on the second shaft, the bevel gear combination is transmitted to the three shafts and three teeth of the three shafts in the lower housing, and the power is transmitted from the three shafts and three teeth to the three shafts, the large double teeth for traveling on the three shafts are respectively combined with the two teeth of the four shafts and the one tooth of the four shafts on the four shafts, so as to realize the first gear and the second gear shifting function for traveling, the large double teeth for traveling are combined with the six shafts large double teeth of the six shafts, and the reverse gear function is realized through the one tooth of the four shafts, and the double teeth of the four shafts are respectively combined with the one tooth of the three shafts and the three teeth of the three shafts, so as to realize the third gear and the fourth gear shifting function for traveling. The present scheme has a simple structure, can provide multiple gear selections, has an obvious deceleration effect, has a high clutch transmission efficiency, has low power consumption, and has a long service life.

[0019] (2) The present invention is a gearbox structure applied to a micro four-wheel drive farm management machine, which is provided with a steering adjustment mechanism. The four shafts transmit power to the five shafts and one tooth, and the five shafts and one tooth are transmitted to the travel output gear of the travel steering mechanism. There are six steel balls on the left and right sides of the travel output gears, which are engaged with the six R grooves of the left and right half shafts. The clutch sleeve controls the engagement and separation to control the rotation or stillness of the left and right travel output shafts, thereby realizing left or right turn. The travel is embedded with steel balls and controlled by the external clutch sleeve. The left and right half shafts are designed with R grooves, which solves the problem of difficult steering separation of the original four-wheel drive farm management machine, and can easily turn left or right.

[0020] (3) The present invention is a gearbox structure applied to a micro four-wheel drive farm management machine, which is provided with a rotary tillage power mechanism. The rotary tillage power is transmitted from the three-axis two teeth to the six-axis one tooth. The rotary tillage and furrowing reversing functions are transmitted from the six-axis small double to the seven-axis one tooth of the seven-axis. The rotary tillage and furrowing reversing functions are then transmitted from the six-axis small double to the seven-axis one tooth of the seven-axis. The transmission is then transmitted from the eight-axis small moving sprocket to the hexagonal shaft middle sprocket via a chain. The hexagonal shaft is splined with the rotary tillage driven sprocket, thereby realizing forward or reverse rotary tillage, furrowing and weeding functions. The rotary tillage and travel speeds are separated and can be controlled separately, which is convenient for the use of the rotary tillage, furrowing and weeding functions of the farm management machine, truly realizing easy and reliable operation and diversified functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the internal structure of the lower box body of the present invention;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the upper box body in the present invention.

[0023] In the accompanying drawings: 1, upper housing; 2, clutch assembly; 3, bevel gear shaft; 4, second shaft; 5, bevel gear combination; 6, third shaft; 7, third shaft one tooth; 8, third shaft two teeth; 9, third shaft three teeth; 10, large double gear for travel; 11, fourth shaft; 12, double gear for four shaft; 13, one gear for four shaft; 14, two gears for four shaft; 15, three gears for four shaft; 16, fifth shaft; 17, one gear for five shaft; 18, output gear for travel; 19, clutch sleeve; 20, left half shaft; 21, right half shaft; 22, sixth shaft; 23, one gear for six shaft; 24, small double gear for six shaft; 25, large double gear for six shaft; 26, seventh shaft; 27, one gear for seven shaft; 28, two gears for seven shaft; 29, eighth shaft; 30, small sprocket; 31, hexagonal shaft; 32, middle sprocket; 33, lower housing. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0026] Example

[0027] See also Figure 1 and Figure 2 As shown, the present invention provides a technical solution of a gearbox structure applied to a miniature four-wheel drive farmland management machine: comprising an upper case 1 and a lower case 33, the upper case 1 is connected to the lower case 33, and a clutch assembly 2 is arranged in the upper case 1, specifically, the clutch assembly 2 adopts a plate friction clutch, and the clutch assembly 2 is connected to an external power source, a bevel gear shaft 3 is arranged on the clutch assembly 2, and two shafts 4 are arranged on one side of the bevel gear shaft 3, and a bevel gear combination 5 is arranged on the two shafts 4, specifically, the bevel gear combination 5 is a combination of a bevel gear and a spur gear, and the bevel gear part is meshed with the bevel gear shaft 3, and a speed adjustment mechanism is arranged in the lower case 33, and specifically, the speed adjustment mechanism can realize multi-gear adjustment of the gearbox;

[0028] The speed adjustment mechanism includes a three-shaft 6 arranged in the lower box body 33, on which a three-shaft one tooth 7, a three-shaft two teeth 8, a three-shaft three teeth 9 and a large walking double tooth 10 are arranged in sequence, and the three-shaft three teeth 9 cooperate with the bevel gear combination 5, a four-shaft 11 is arranged on one side of the three-shaft 6, and a six-shaft 22 is arranged on the other side of the three-shaft 6, and the four-shaft 11 is respectively provided with a four-shaft double tooth 12, a four-shaft one tooth 13, a four-shaft two teeth 14 and a four-shaft three teeth 15, and the six-shaft 22 is sequentially provided with a six-shaft one tooth 23, a six-shaft small double tooth 24 and a six-shaft large double tooth 25;

[0029] In the above embodiment, power acts on the clutch assembly 2, and the clutch assembly 2 outputs power, which is meshed by the bevel gear shaft 3 and the bevel gear combination 5 to change the rotation direction. The bevel gear combination 5 drives the second shaft 4, and the bevel gear combination 5 spur gear part transmits it to the three-shaft three-tooth 9 in the lower box body 33, and the power is transmitted from the three-shaft three-tooth 9 to the three-shaft 6. The large walking double teeth 10 on the three-shaft 6 are respectively combined with the four-shaft two teeth 14 and the four-shaft one tooth 13 on the four-shaft 11, that is, the first and second gear shifting functions of walking are realized accordingly; the large walking double teeth 10 are combined with the six-shaft large double teeth 25 of the six-shaft 22 to realize the reverse gear function, and when the four-shaft double teeth 12 are respectively combined with the three-shaft one tooth 7 and the three-shaft three teeth 8, the third and fourth gear shifting functions of walking are realized.

[0030] A steering adjustment mechanism is provided on one side of the four-axis 11, and the steering adjustment mechanism includes a five-axis 16 arranged in the lower box body 33, and a five-axis one-tooth 17 is provided on the five-axis 16. A left half-axis 20 and a right half-axis 21 are provided on one side of the five-axis one-tooth 17, respectively. The left half-axis 20 and the right half-axis 21 penetrate the lower box body 33 and extend outward, and the left half-axis 20 and the right half-axis 21 are jointly provided with a travel output gear 18, and clutch sleeves 19 are provided on both sides of the travel output gear 18, and the two clutch sleeves 19 are respectively connected to the left half-axis 20 and the right half-axis 21. Specifically, the two ends of the left half-axis 20 and the right half-axis 21 are respectively connected to the travel wheel assembly, and the left half-axis 20 and the right half-axis 21 drive the travel;

[0031] In the above embodiment, the four-axle 11 transmits power to the five-axle-one-tooth 17, and the five-axle-one-tooth 17 transmits power to the travel output gear 18 of the travel steering mechanism. There are six steel balls on each side of the travel output gear, which are engaged with the six R grooves of the left half-axle 20 and the right half-axle 21. The clutch sleeve 19 controls the engagement and separation to control the rotation or stillness of the left and right travel output shafts, thereby realizing left or right turn.

[0032] A rotary tillage power mechanism is provided on one side of the six-axis small double-tooth 24, and the rotary tillage power mechanism includes a seven-axis 26 arranged in a lower box body 33, and a seven-axis one tooth 27 and a seven-axis two tooth 28 are provided on the seven-axis 26, and an eight-axis 29 is provided on one side of the seven-axis 26, and a seven-axis two tooth 28 is provided on the eight-axis 29, and a small sprocket 30 is provided on the eight-axis 29, and a hexagonal shaft 31 is passed through the tail of the lower box body 33, and a middle sprocket 32 ​​is provided on the hexagonal shaft 31 located in the lower box body 33, and the middle sprocket 32 ​​is connected to the small sprocket 30 through a chain;

[0033] In the above embodiment, the rotary tillage power is transmitted from the three-shaft two-tooth 8 to the six-shaft one-tooth 23, and the rotary tillage and furrowing reversing functions are transmitted from the six-shaft small double 24 to the seven-shaft one-tooth 27 of the seven-shaft 26, and then transmitted by the seven-shaft two-tooth 28, and then transmitted by the eight-shaft 29 small moving sprocket 30 to the middle sprocket 32 ​​of the hexagonal shaft 31 through the chain. The hexagonal shaft 31 is connected to the driven sprocket of the rotary tillage assembly through a spline, and the external rotary tillage assembly is driven by the hexagonal shaft 31 to realize forward or reverse rotary tillage, furrowing, and grassing functions.

[0034] See also Figure 1 and Figure 2 As shown, further, the second shaft 4, the third shaft 6, the fourth shaft 11, the fifth shaft 16, the left half shaft 20, the right half shaft 21, the sixth shaft 22, the seventh shaft 26, the eighth shaft 29 and the hexagonal shaft 31 are all rotatably connected to the box through bearings.

[0035] In this embodiment, bearing transmission is used to ensure the stable rotation of the second shaft 4, the third shaft 6, the fourth shaft 11, the fifth shaft 16, the left half shaft 20, the right half shaft 21, the sixth shaft 22, the seventh shaft 26, the eighth shaft 29 and the hexagonal shaft 31.

[0036] See also Figure 1 and Figure 2 As shown, further, the three-axis two-tooth 8 cooperates with the six-axis one-tooth 23, the six-axis small double tooth 24 cooperates with the seven-axis one-tooth 27, the seven-axis two-tooth 28 cooperates with the seven-axis one-tooth 27 on the eight-axis 29, and the two ends of the hexagonal shaft 31 are connected to the driven sprocket of the rotary tillage assembly through a spline, so as to realize the functions of forward or reverse rotary tillage, furrowing, and grassing.

[0037] In this embodiment, driven by the hexagonal shaft 31, the forward or reverse rotary tillage, furrowing and weeding functions can be realized. The rotary tillage and walking speeds are separate and can be controlled separately, which is convenient for the use of the rotary tillage, furrowing and weeding functions of the farm management machine, truly realizing easy and reliable operation and diversified functions.

[0038] See also Figure 1 and Figure 2 As shown, further, the large double-linked walking gear 10 cooperates with the four-axis two-gear 14 and the four-axis one-gear 13 on the four-axis 11 to realize the first and second gear shifting functions of the walking;

[0039] The large double-linked gear 10 for traveling cooperates with the large double-linked gear 25 of the six-axis 22 to realize the reverse gear function;

[0040] The four-axis double-linked teeth 12 cooperate with the three-axis one-tooth 7 and the three-axis three-tooth 9 respectively to realize the three-speed and four-speed shifting functions.

[0041] In this embodiment, multiple gear selections can be achieved by utilizing the coordination between gears, with obvious deceleration effect, high clutch transmission efficiency, low power consumption and long service life.

[0042] See also Figure 1 and Figure 2 As shown, further, six steel balls are provided on both sides of the travel output gear 18, and the six steel balls are sequentially engaged with the six R grooves in the left half shaft 20 and the right half shaft 21, and the clutch sleeve 19 controls the engagement and separation to control the rotation or stillness of the left and right travel output shafts.

[0043] In this embodiment, the steel balls are embedded, the external clutch sleeve is controlled, and the left and right half-axles are designed with R grooves, which solves the problem of difficult steering separation of the original four-wheel drive farm management machine and can easily turn left or right.

[0044] Specifically, the working principle and use process of the present invention are as follows: power acts on the clutch assembly 2, the clutch assembly 2 outputs power, the bevel gear shaft 3 meshes with the bevel gear combination 5, the rotation direction is changed, the bevel gear combination 5 drives the second shaft 4, the bevel gear combination 5 spur gear part transmits to the third shaft three teeth 9 in the lower box body 33, and the power is transmitted from the third shaft three teeth 9 to the third shaft 6, the large walking double teeth 10 on the third shaft 6 are respectively combined with the fourth shaft two teeth 14 and the fourth shaft one tooth 13 on the fourth shaft 11, that is, the first and second gear shifting functions of walking are realized correspondingly; the large walking double teeth 10 are combined with the six-shaft large double teeth 25 of the sixth shaft 22 to realize the reverse gear function, and when the four-shaft double teeth 12 are respectively combined with the three-shaft one tooth 7 and the three-shaft three teeth 8, the third and fourth gear shifting functions of walking are realized;

[0045] The four-axis 11 transmits power to the five-axis one-tooth 17, which transmits power to the travel output gear 18 of the travel steering mechanism. The travel output gear has six steel balls on each side, which are engaged with the six R grooves of the left half-axis 20 and the right half-axis 21. The clutch sleeve 19 controls the combination and separation to control the rotation or stillness of the left and right travel output shafts, thereby realizing left or right turn.

[0046] The three-axis two-tooth 8 is transmitted to the six-axis one-tooth 23, and the rotary tillage and furrowing reversing function is transmitted to the seven-axis one-tooth 27 of the seven-axis 26 by the six-axis small double 24, and then transmitted to the middle sprocket 32 ​​of the hexagonal shaft 31 by the small moving sprocket 30 of the eight-axis 29 through the chain. The hexagonal shaft 31 is connected to the driven sprocket of the rotary tillage component through a spline, and the external rotary tillage component is driven by the hexagonal shaft 31 to realize the forward or reverse rotary tillage, furrowing and grass removal functions until the entire working sequence is completed.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0048] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gearbox structure applied to a miniature four-wheel drive farmland management machine, characterized in that: The invention comprises an upper case (1) and a lower case (33), wherein the upper case (1) is connected to the lower case (33), and a clutch assembly (2) is arranged in the upper case (1), a bevel gear shaft (3) is arranged on the clutch assembly (2), two shafts (4) are arranged on one side of the bevel gear shaft (3), a bevel gear assembly (5) is arranged on the two shafts (4), and a speed adjustment mechanism is arranged in the lower case (33); The speed adjustment mechanism comprises three shafts (6) arranged in a lower case (33); three shafts (6) are provided with one tooth (7), two teeth (8), three shafts (9) and a large double tooth (10) for traveling in sequence; the three shafts (9) are matched with a bevel gear assembly (5); one side of the three shafts (6) is provided with a four shaft (11); the other side of the three shafts (6) is provided with a six shaft (22); the four shafts (11) are provided with a four shaft double tooth (12), one tooth (13), two teeth (14) and three teeth (15); the six shafts (22) are provided with one tooth (23), a small double tooth (24) and a large double tooth (25); A steering adjustment mechanism is provided on one side of the four shafts (11), the steering adjustment mechanism comprising a five shaft (16) arranged in a lower box (33), the five shafts (16) being provided with a five shaft one tooth (17), a left half shaft (20) and a right half shaft (21) being provided on one side of the five shaft one tooth (17), the left half shaft (20) and the right half shaft (21) passing through the lower box (33) and extending outwards, a travel output gear (18) being provided on both sides of the left half shaft (20) and the right half shaft (21), clutch sleeves (19) being provided on both sides of the travel output gear (18), and two clutch sleeves (19) being connected to the left half shaft (20) and the right half shaft (21) respectively; A rotary tillage power mechanism is provided on one side of the six-shaft small double-tooth (24), the rotary tillage power mechanism comprising a seven-shaft (26) arranged in a lower box (33), the seven-shaft (26) being provided with a seven-shaft one tooth (27) and a seven-shaft two teeth (28), an eight-shaft (29) being provided on one side of the seven-shaft (26), the eight-shaft (29) being provided with a seven-shaft two teeth (28), a small sprocket (30) being provided on the eight-shaft (29), a hexagonal shaft (31) being passed through the tail of the lower box (33), a middle sprocket (32) being provided on the hexagonal shaft (31) located in the lower box (33), the middle sprocket (32) being connected to the small sprocket (30) via a chain; The three-axis two teeth (8) cooperate with the six-axis one tooth (23), the six-axis small double tooth (24) cooperates with the seven-axis one tooth (27), the seven-axis two teeth (28) cooperate with the seven-axis one tooth (27) on the eight-axis (29), and the two ends of the hexagonal shaft (31) are connected to the driven sprocket of the rotary tillage component through splines, so that the functions of forward or reverse rotary tillage, furrowing, and weeding can be realized; The large double-linked walking gear (10) cooperates with the four-axis two gears (14) and the four-axis one gear (13) on the four-axis (11) respectively, so as to realize the first gear and second gear shifting function of the walking gear; The large double-linked walking gear (10) cooperates with the large double-linked six-axis gear (25) of the six-axis (22), and is transmitted by the four-axis one-tooth (13) to realize the reverse gear function; The four-axis double-linked teeth (12) cooperate with the three-axis one-tooth (7) and the three-axis three-tooth (9) respectively to realize the three-gear and four-gear shifting functions; Six steel balls are provided on both sides of the travel output gear (18), and the six steel balls are sequentially engaged with the six R grooves in the left half shaft (20) and the right half shaft (21), and are controlled to engage and disengage via a clutch sleeve (19) to control the rotation or stillness of the left and right travel output shafts.

2. The gearbox structure used in a miniature four-wheel drive farmland management machine according to claim 1, characterized in that: The second shaft (4), the third shaft (6), the fourth shaft (11), the fifth shaft (16), the left half shaft (20), the right half shaft (21), the sixth shaft (22), the seventh shaft (26), the eighth shaft (29) and the hexagonal shaft (31) are all rotatably connected to the housing via bearings.

3. The gearbox structure used in a miniature four-wheel drive farmland management machine according to claim 1, characterized in that: 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 spur gear.

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