CN217422124U

CN217422124U - Direct-coupled gearbox assembly of mini-tiller with synchronous gears of main box and auxiliary box

Info

Publication number: CN217422124U
Application number: CN202221629010.8U
Authority: CN
Inventors: 王杰荣
Original assignee: Liuzhou Shengbang Agricultural Machinery Co ltd
Current assignee: Liuzhou Shengbang Agricultural Machinery Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-09-13
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to the technical field of agricultural machinery, specifically be a quick-witted associated mode gearbox assembly is ploughed a little to synchronous machine of main and auxiliary case gear, including walking main tank and with the rotary tillage auxiliary tank and the associated mode clutch of walking main tank hookup, the walking main tank includes main tank body, transmission one, transmission two, transmission triaxial, transmission four-axis and transition axle, is provided with transition first gear and transition second gear on the transition axle, and the gear wheel meshing of transition first gear and a reverse gear driven gear, the transmission gear meshing that sets up in transition second gear and the auxiliary tank. The utility model discloses a plough quick-witted associated mode gearbox assembly a little and keep off position reasonable in distribution, the fender position of walking main tank changes and the fender position of rotary tillage auxiliary tank changes and has the synchronism, plough the machine no matter with which fender position walking a little, the walking power take off of walking main tank and the rotary tillage power take off of rotary tillage auxiliary tank go on in step, only need switch the walking fender position can realize the different farming operation demands that keep off the position of user, switch and control comparatively convenient to keeping off the position.

Description

Direct-coupled gearbox assembly of mini-tiller with synchronous gears of main box and auxiliary box

Technical Field

The utility model relates to the technical field of agricultural machinery, specifically be a quick-witted associated mode gearbox assembly is ploughed a little to synchronous machine of major-minor case gear.

Background

The gearbox of the tillage machine in the market has the problem that operation gears are inconvenient to control, so that the adaptability of the machine is poor, and the use efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a quick-witted associated mode gearbox assembly is ploughed in declining of synchronous owner's auxiliary box gear position in order to solve above-mentioned problem.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a direct-connected gearbox assembly of a micro-tillage machine with synchronous main and auxiliary box gears comprises a walking main box, a rotary tillage auxiliary box and a direct-connected clutch, wherein the rotary tillage auxiliary box is connected with the walking main box; the walking main box comprises a main box body, a first transmission shaft, a second transmission shaft, a third transmission shaft, a reverse gear shaft, a fourth transmission shaft, a high-speed clutch shaft, a low-speed clutch shaft, a steering shaft, a driving shaft and a transition shaft; a first transmission gear and a driven bevel gear are arranged on the first transmission shaft, a second transmission gear is arranged on the second transmission shaft, and the second transmission gear is meshed with the first transmission gear; a three-shaft transmission gear, a two-third gear driving gear and a reverse gear driving gear are arranged on the transmission three shaft, the two-third gear driving gear is a duplicate gear, the three-shaft transmission gear is in meshing transmission with the two-shaft transmission gear, and the one reverse gear driving gear and the two-third gear driving gear can axially move along the transmission three shaft; a second-gear driven gear, a third-gear driven gear and a reverse gear driven gear are arranged on the transmission four-shaft, the reverse gear driven gear is a duplicate gear, a reverse gear duplicate gear is arranged on the reverse gear shaft, the reverse gear duplicate gear is rotatably supported on the reverse gear shaft, and a small gear of the reverse gear duplicate gear is meshed with a large gear of the reverse gear driven gear; the high-low speed clutch shaft is provided with a high-speed clutch gear, a variable speed clutch duplicate gear and a low-speed clutch gear, the variable speed clutch duplicate gear can move along the axial direction of the high-low speed clutch shaft to be meshed with the low-speed clutch gear or the high-speed clutch gear, the low-speed clutch gear is meshed with a pinion of a reverse gear driven gear, and the high-speed clutch gear is meshed with a secondary driven gear; a transition first gear and a transition second gear are arranged on the transition shaft, the transition first gear is meshed with a large gear of a reverse gear driven gear, and the transition second gear is meshed with a transmission gear arranged in the auxiliary box body; a reverse gear driving gear on the three transmission shafts is meshed with a gear wheel of a reverse gear driven gear on the four transmission shafts to form a first gear, a pinion of a second-third gear driving gear on the three transmission shafts is meshed with a second-second gear driven gear on the four transmission shafts to form a second gear, a gear wheel of the second-third gear driving gear on the three transmission shafts is meshed with a third-gear driven gear on the four transmission shafts to form a third gear, and a reverse gear driving gear on the three transmission shafts is meshed with a gear wheel of a reverse gear duplicate gear to form a reverse gear.

Preferably, the auxiliary box body is detachably connected to the left side of the main box body through screws, and bearings fixed on the auxiliary box body are respectively arranged on shaft necks at two ends of the transmission shaft and the rotary tillage shaft.

Preferably, the direct-coupled clutch comprises a clutch box body, a clutch shaft and a clutch bevel gear, the clutch box body is detachably connected to the right side of the main box body through a screw, and the right side of the clutch box body is used for being connected with the engine; the clutch shaft is arranged in the clutch box body and used for outputting power of an engine, one end of the clutch shaft extends out of the clutch box body and is fixedly connected with the clutch bevel gear, the middle of the clutch shaft is connected with the clutch hand lever through the clutch shifting fork, and the clutch bevel gear on the clutch shaft is controlled to be meshed with or separated from the driven bevel gear by shifting the clutch hand lever.

Preferably, the three transmission shafts are spline shafts, and the first reverse gear driving gear, the second third gear driving gear and the three transmission shafts are in sliding connection through splines.

Preferably, the inner ring of the reverse double gear is rotatably supported on the reverse shaft through a copper sleeve, and the reverse double gear is axially positioned through a retainer ring.

Preferably, a spline shaft is arranged in the middle of the high-speed and low-speed clutch shaft, the speed-change clutch duplicate gear is in sliding connection with the spline shaft in the middle of the high-speed and low-speed clutch shaft through the spline, inner teeth are arranged on the inner sides of the low-speed clutch gear and the high-speed clutch gear, and outer teeth of the speed-change clutch duplicate gear can be embedded into the inner teeth of the low-speed clutch gear and the high-speed clutch gear.

Preferably, the steering shaft is provided with a jaw clutch device, the jaw clutch device comprises a central transmission gearwheel and two steering gears, the central transmission gearwheel is arranged on the steering shaft and is engaged with the speed-changing clutch duplicate gear, the two steering gears are arranged on two sides of the central transmission gearwheel and can move axially, the central transmission gearwheel and the two steering gears are provided with corresponding rectangular teeth which are arranged on the steering shaft, and power is transmitted by mutual embedding of the rectangular teeth.

Preferably, the driving shaft is rotatably connected to a bearing seat through a bearing, the bearing seat is fixed on two sides of the main box body, two driving gears are mounted on the driving shaft, the steering gear is normally meshed with the driving gears correspondingly, and a driving wheel is mounted on the driving shaft.

The utility model discloses a plough quick-witted associated mode gearbox assembly a little and keep off position reasonable in distribution, the fender position of walking main tank changes and the fender position of rotary tillage auxiliary tank changes and has the synchronism, plough the machine no matter with which fender position walking a little, the walking of walking main tank and the rotary tillage power take off of rolling the field power take off and rotary tillage auxiliary tank go on in step, only need switch the walking keep off the position and can realize the different farming operation demands that keep off the position of user, switch and control comparatively convenient to keeping off the position, the availability factor is high.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a direct-coupled gearbox assembly of a micro-tillage machine with synchronous main and auxiliary box gears provided in the preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view of the reverse shaft and the reverse duplicate gear disposed thereon of FIG. 1;

FIG. 4 is a cross-sectional view of the four drive shafts of the travel main box, the transition shaft, and the drive shaft of the auxiliary rotary tillage box of FIG. 1;

in the figure: 10. a main box body; 11. a drive shaft; 111. a driven bevel gear; 112. a shaft transmission gear; 12. a transmission two-shaft; 121. a two-axis transmission gear; 13. three shafts are driven; 131. a three-axis drive gear; 132. a reverse drive gear; 133. a second and third gear driving gear; 14. a transmission four-axis; 141. a reverse driven gear; 142. a second driven gear; 143. a third-gear driven gear; 15. a high-low speed clutch shaft; 151. a low-speed clutch gear; 152. a variable speed clutch duplicate gear; 153. a high-speed clutch gear; 16. a steering shaft; 161. a central driving gearwheel; 162. a steering gear; 17. a drive shaft; 170. a bearing seat; 171. a drive gear; 18. a reverse gear shaft; 181. a reverse double gear; 19. a transition shaft; 191. a transition first gear; 192. a transition second gear; 20. an auxiliary box body; 21. a drive shaft; 210. a transmission gear; 22. a rotary tillage shaft; 220. a rotary tillage gear; 31. a clutch box body; 32. a clutch shaft; 33. clutch bevel gear.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and illustrate, by way of illustration only, the basic structure of the invention, and which therefore show only the constituents relevant to the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 by those of ordinary skill in the art through specific situations.

As shown in fig. 1 to 4, a preferred embodiment of the present invention provides a direct-coupled gearbox assembly of a micro-tillage machine with synchronous gear positions of a main gearbox and an auxiliary gearbox, which comprises a walking main box, a rotary tillage auxiliary box connected with the walking main box, and a direct-coupled clutch.

The walking main box comprises a main box body 10, a first transmission shaft 11, a second transmission shaft 12, a third transmission shaft 13, a reverse gear shaft 18, a fourth transmission shaft 14, a high-low speed clutch shaft 15, a steering shaft 16, a driving shaft 17 and a transition shaft 19, wherein shaft necks at two ends of each shaft are respectively provided with a bearing fixed on the main box body 10.

The rotary tillage auxiliary box comprises an auxiliary box body 20, a plurality of transmission shafts 21 and a rotary tillage shaft 22, the auxiliary box body 20 is detachably connected to the left side of the main box body 10 through screws, shaft necks at two ends of the transmission shafts 21 and the rotary tillage shaft 22 are respectively provided with a bearing fixed on the auxiliary box body 20, each transmission shaft 21 is provided with a transmission gear 210, a rotary tillage gear 220 is arranged on the rotary tillage shaft 22, the transmission gears 210 on the plurality of transmission shafts 21 and the rotary tillage gear 220 on the rotary tillage shaft 22 are in meshed transmission, power output by an engine is transmitted to the rotary tillage gear 220 and the rotary tillage shaft 22 through the transmission gears 210 on the transmission shafts 21, rotary tillage cutter discs or harrowing wheels can be installed at two ends of the rotary tillage shaft 22, harrowing and rotary tillage on a field can be realized, and different operation requirements of users are met.

The transmission shaft 11 is provided with a shaft transmission gear 112 and a driven bevel gear 111. The transmission shaft 11 is a spline shaft, the driven bevel gear 111 and the transmission gear 112 are in spline static connection with the transmission shaft 11, and the driven bevel gear 111 and the transmission gear 112 rotate synchronously with the transmission shaft 11.

As shown in fig. 1, a direct clutch is coupled to the right side of the main traveling box, and the direct clutch includes a clutch housing 31, a clutch shaft 32, and a clutch bevel gear 33. The clutch housing 31 is detachably connected to the right side of the main housing 10 through screws, and the right side of the clutch housing 31 is used for being connected with an engine; the clutch shaft 32 is arranged in the clutch box 31 and used for outputting the power of the engine, one end of the clutch shaft 32 extends out of the clutch box 31 and is fixedly connected with the clutch bevel gear 33, the middle of the clutch shaft 32 is connected with the clutch hand lever through the clutch shifting fork, and the clutch bevel gear 33 on the clutch shaft 32 is controlled to be meshed with or separated from the driven bevel gear 111 by shifting the clutch hand lever, so that the power output by the engine is transmitted to the transmission shaft 11 or the power transmitted to the transmission shaft 11 is cut off.

The main casing 10, the sub-casing 20, and the clutch casing 31 are integrally formed of cast steel.

The transmission secondary shaft 12 is provided with a secondary transmission gear 121, the transmission secondary shaft 12 is a spline shaft, the secondary transmission gear 121 is statically connected with the transmission secondary shaft 12 through a spline, so that the secondary transmission gear 121 and the transmission secondary shaft 12 synchronously rotate, and the secondary transmission gear 121 is meshed with the primary transmission gear 112.

A three-shaft transmission gear 131, a two-third gear driving gear 133 and a reverse gear driving gear 132 are arranged on the three transmission shafts 13, the two-third gear driving gear 133 is a duplicate gear, the three transmission shafts 13 are spline shafts, two ends of the three-shaft transmission gear 131 are axially positioned by using shaft retaining rings and are statically connected with the three transmission shafts 13 by using splines, and the three-shaft transmission gear 131 is in meshing transmission with the two-shaft transmission gear 121; the first reverse driving gear 132 and the second third driving gear 133 are slidably connected to the third transmission shaft 13 by splines, and the first reverse driving gear 132 and the second third driving gear 133 are controlled by a shift fork to move axially along the third transmission shaft 13.

The two-gear driven gear 142, the three-gear driven gear 143 and the reverse gear driven gear 141 are arranged on the four transmission shafts 14, the four transmission shafts 14 are spline shafts, the reverse gear driven gear 141 is a duplicate gear, the one reverse gear driven gear 141, the two-gear driven gear 142 and the three-gear driven gear 143 are in spline static connection with the four transmission shafts 14, and the one reverse gear driven gear 141, the two-gear driven gear 142 and the three-gear driven gear 143 rotate synchronously with the four transmission shafts 14.

The reverse shaft 18 is provided with a reverse double gear 181, the reverse double gear 181 is rotatably supported on the reverse shaft 18, specifically, an inner ring of the reverse double gear 181 is rotatably supported on the reverse shaft 18 through a copper bush (not shown), the reverse double gear 181 is axially positioned through a retaining ring (not shown), and a pinion of the reverse double gear 181 meshes with a bull gear of a reverse driven gear 141.

The high-low speed clutch shaft 15 is provided with a high speed clutch gear 153, a speed change clutch double gear 152 and a low speed clutch gear 151. Two ends of the high-low speed clutch shaft 15 are optical axes, and the low-speed clutch gear 151 and the high-speed clutch gear 153 are statically connected with two ends of the high-low speed clutch shaft 15 through unthreaded holes. The middle of the high-low speed clutch shaft 15 is a spline shaft, the speed-change clutch double gear 152 is in sliding connection with the spline shaft in the middle of the high-low speed clutch shaft 15 through a spline, and a fixed shifting fork (not shown) is connected to the speed-change clutch double gear 152. Inner teeth are formed on the inner sides of the low-speed clutch gear 151 and the high-speed clutch gear 153, and outer teeth of the speed-change clutch duplicate gear 152 can be embedded into the inner teeth of the low-speed clutch gear 151 and the high-speed clutch gear 153 to be meshed with the low-speed clutch gear 151 and the high-speed clutch gear 153, so that the speed-change clutch duplicate gear 152 and the low-speed clutch gear 151 or the speed-change clutch duplicate gear 152 and the high-speed clutch gear 153 synchronously rotate. The low-speed clutch gear 151 meshes with a pinion of a reverse driven gear 141, and the high-speed clutch gear 153 meshes with a second driven gear 142.

The steering shaft 16 is provided with a dog clutch device, which includes a central driving gearwheel 161 and two steering gearwheels 162 arranged on the steering shaft 16, the central driving gearwheel 161 meshing with the speed change clutch double gear 152. The central driving gearwheel 161 is fixed on the steering shaft 16, the two steering gears 162 are located on both sides of the central driving gearwheel 161 and can move axially, the central driving gearwheel 161 and the two steering gears 162 are provided with corresponding rectangular teeth which are arranged on the steering shaft 16, the central driving gearwheel 161 and the two steering gears 162 are pressed on the central driving gearwheel 161 by a spring (not shown) during non-steering, power is transmitted by mutual embedding of the rectangular teeth, the steering gears 162 are moved by a shifting fork during steering, and the rectangular teeth are separated, so that steering is realized.

The driving shaft 17 is used for driving the mini-tiller to walk, the driving shaft 17 is rotatably connected to a bearing seat 170 through a bearing, the bearing seat 170 is fixed on two sides of the main box body 10, two driving gears 171 are mounted on the driving shaft 17, the steering gear 162 is normally meshed with the driving gears 171 correspondingly, and driving wheels (not shown) are mounted on the driving shaft 17 and have the functions of walking and rolling.

The transition shaft 19 is provided with a transition first gear 191 and a transition second gear 192, the transition shaft 19 is a spline shaft, and the transition first gear 191 and the transition second gear 192 are in spline static connection with the transition shaft 19, so that the transition first gear 191 and the transition second gear 192 and the transition shaft 19 synchronously rotate. The transition first gear 191 is meshed with a large gear of a reverse gear driven gear 141, and the transition second gear 192 is meshed with a transmission gear 210 arranged in the auxiliary box body 20, so that gear change of the walking main box and gear change of the rotary tillage auxiliary box have synchronism, and walking power output of the walking main box is synchronous with rotary tillage power output of the rotary tillage auxiliary box.

When the utility model is used, when a reverse gear driving gear 132 is controlled by a shifting fork to move axially along the three transmission shafts 13, the reverse gear driving gear 132 is meshed with a big gear of a reverse gear driven gear 141 on the four transmission shafts 14, and the micro-cultivator moves forwards at a gear; when the shifting fork is used for controlling the second-third gear driving gear 133 to axially move along the three transmission shafts 13, so that the pinion of the second-third gear driving gear 133 is meshed with the second-gear driven gear 142 on the four transmission shafts 14, the mini-tiller moves forwards at the second gear position; when the shifting fork is used for controlling the second-third gear driving gear 133 to axially move along the three transmission shafts 13, the large gear of the second-third gear driving gear 133 is meshed with the third-gear driven gear 143 on the four transmission shafts 14, and the mini-tiller moves forwards at a third gear; when a shifting fork is used for controlling a reverse gear driving gear 132 to axially move along the three transmission shafts 13, so that the reverse gear driving gear 132 is meshed with a large gear of the reverse gear duplicate gear 181, the mini-tiller backwards travels in a reverse gear; when the shifting fork is used for controlling the speed-changing clutch duplicate gear 152 to axially move along the high-low speed clutch shaft 15, so that the speed-changing clutch duplicate gear 152 is meshed with the low-speed clutch gear 151 to form a slow gear, the driving shaft 17 rotates at a lower speed to drive the mini-tiller to walk; when the shifting fork is used for controlling the speed-changing clutch duplicate gear 152 to axially move along the high-low speed clutch shaft 15, so that the speed-changing clutch duplicate gear 152 is meshed with the high-speed clutch gear 153 to form a fast gear, the driving shaft 17 rotates at a higher speed to drive the micro-cultivator to walk; no matter which gear is used for walking of the micro-tillage machine, power output from the transmission four-shaft 14 synchronously passes through the reverse gear driven gear 141, the transition first gear 191, the transition second gear 192, the transmission gear 210 and the rotary tillage gear 220 in sequence to be transmitted to the rotary tillage shaft 22, plowing and harrowing are carried out on a field through rotary tillage cutter heads or harrowing wheels arranged at two ends of the rotary tillage shaft 22, gear change of a walking main box and gear change of a rotary tillage auxiliary box are synchronous, and walking power output of the walking main box is synchronous with rotary tillage power output of the rotary tillage auxiliary box.

The above descriptions of the embodiments of the present invention that are not related to the present invention are well known in the art, and can be implemented by referring to the well-known technologies.

In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a quick-witted associated mode gearbox assembly is ploughed in declining of main and auxiliary box gear position synchronization, includes walking main tank and with rotary tillage auxiliary tank and the associated mode clutch of walking main tank hookup, its characterized in that: the rotary tillage auxiliary box comprises an auxiliary box body, a plurality of transmission shafts and a rotary tillage shaft, wherein each transmission shaft is provided with a transmission gear, the rotary tillage shaft is provided with a rotary tillage gear, and the transmission gears on the plurality of transmission shafts and the rotary tillage gear on the rotary tillage shaft are in meshing transmission; the walking main box comprises a main box body, a first transmission shaft, a second transmission shaft, a third transmission shaft, a reverse gear shaft, a fourth transmission shaft, a high-low speed clutch shaft, a steering shaft, a driving shaft and a transition shaft; a first transmission gear and a driven bevel gear are arranged on the first transmission shaft, a second transmission gear is arranged on the second transmission shaft, and the second transmission gear is meshed with the first transmission gear; a three-shaft transmission gear, a two-third gear driving gear and a reverse gear driving gear are arranged on the transmission three shaft, the two-third gear driving gear is a duplicate gear, the three-shaft transmission gear is in meshing transmission with the two-shaft transmission gear, and the one reverse gear driving gear and the two-third gear driving gear can axially move along the transmission three shaft; a second-gear driven gear, a third-gear driven gear and a reverse gear driven gear are arranged on the transmission four-shaft, the reverse gear driven gear is a duplicate gear, a reverse gear duplicate gear is arranged on the reverse gear shaft, the reverse gear duplicate gear is rotatably supported on the reverse gear shaft, and a small gear of the reverse gear duplicate gear is meshed with a large gear of the reverse gear driven gear; the high-low speed clutch shaft is provided with a high-speed clutch gear, a variable speed clutch duplicate gear and a low-speed clutch gear, the variable speed clutch duplicate gear can move along the axial direction of the high-low speed clutch shaft to be meshed with the low-speed clutch gear or the high-speed clutch gear, the low-speed clutch gear is meshed with a pinion of a reverse gear driven gear, and the high-speed clutch gear is meshed with a secondary driven gear; a transition first gear and a transition second gear are arranged on the transition shaft, the transition first gear is meshed with a large gear of a reverse gear driven gear, and the transition second gear is meshed with a transmission gear arranged in the auxiliary box body; a reverse gear driving gear on the three transmission shafts is meshed with a gear wheel of a reverse gear driven gear on the four transmission shafts to form a first gear, a pinion of a two-three gear driving gear on the three transmission shafts is meshed with a two-gear driven gear on the four transmission shafts to form a second gear, a gear wheel of a two-three gear driving gear on the three transmission shafts is meshed with a three-gear driven gear on the four transmission shafts to form a third gear, and a reverse gear driving gear on the three transmission shafts is meshed with a gear wheel of a reverse gear duplex gear to form a reverse gear.

2. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 1, wherein: the auxiliary box body is detachably connected to the left side of the main box body through screws, and bearings fixed on the auxiliary box body are respectively arranged on shaft necks at two ends of the transmission shaft and the rotary tillage shaft.

3. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 1, wherein: the direct-coupled clutch comprises a clutch box body, a clutch shaft and a clutch bevel gear, the clutch box body is detachably connected to the right side of the main box body through screws, and the right side of the clutch box body is used for being connected with an engine; the clutch shaft is arranged in the clutch box body and used for outputting power of an engine, one end of the clutch shaft extends out of the outer side of the clutch box body and is fixedly connected with the clutch bevel gear, the middle of the clutch shaft is connected with the clutch hand lever through the clutch shifting fork, and the clutch bevel gear on the clutch shaft is controlled to be meshed with or separated from the driven bevel gear by shifting the clutch hand lever.

4. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 1, wherein: the three transmission shafts are spline shafts, and the first reverse gear driving gear, the second third gear driving gear and the three transmission shafts are in sliding connection through splines.

5. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 1, wherein: the inner ring of the reverse gear duplicate gear is rotatably supported on the reverse gear shaft through a copper sleeve, and the reverse gear duplicate gear is axially positioned through a check ring.

6. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 1, wherein: the middle of the high-speed clutch shaft and the low-speed clutch shaft is provided with a spline shaft, the speed-changing clutch duplicate gear is in sliding connection with the spline shaft in the middle of the high-speed clutch shaft through the spline, the inner sides of the low-speed clutch gear and the high-speed clutch gear are provided with inner teeth, and the outer teeth of the speed-changing clutch duplicate gear can be embedded into the inner teeth of the low-speed clutch gear and the high-speed clutch gear.

7. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 1, wherein: the steering shaft is provided with a jaw clutch device, the jaw clutch device comprises a central transmission gear wheel and two steering gears, the central transmission gear wheel and the two steering gears are arranged on the steering shaft, the central transmission gear wheel is meshed with the variable-speed clutch duplicate gear, the two steering gears are positioned on two sides of the central transmission gear wheel and can move axially, the central transmission gear wheel and the two steering gears are provided with corresponding rectangular teeth, the rectangular teeth are arranged on the steering shaft, and power is transmitted through the mutual embedding of the rectangular teeth.

8. The main and auxiliary box gear synchronous micro-cultivator direct-connected gearbox assembly as claimed in claim 7, wherein: the driving shaft is rotatably connected to the bearing seats through bearings, the bearing seats are fixed on two sides of the main box body, two driving gears are mounted on the driving shaft, the steering gears are normally meshed with the driving gears correspondingly, and driving wheels are mounted on the driving shaft.