CN211693393U

CN211693393U - Main and auxiliary gear box assembly of mini-tiller

Info

Publication number: CN211693393U
Application number: CN202020358514.5U
Authority: CN
Inventors: 王杰荣
Original assignee: Liuzhou Jinhe Machinery Manufacturing Co ltd
Current assignee: Liuzhou Xinsheng Agricultural Machinery Co.,Ltd.
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-10-16
Anticipated expiration: 2030-03-20

Abstract

A main and auxiliary gearbox assembly of a mini-tiller comprises a main gearbox, wherein the main gearbox comprises a box body, a third shaft, a second shaft and a first shaft; be provided with the low-speed external gear on the third axle, slip central gear and high-speed external gear, the third axle both ends are the optical axis, the low-speed external gear, high-speed external gear and third axle both ends are the quiet hookup of unthreaded hole, the spline shaft for the middle of slip central gear and the third axle is linked in a sliding manner, interior round tooth is all seted up with the inboard of high-speed external gear to the low-speed external gear, the outer tooth of slip central gear can imbed the interior round tooth of low-speed external gear and high-speed external gear, in order with the low-speed external gear, high-speed external gear meshing, the utility model discloses a shift fork on stirring slip central gear makes slip central gear along axial displacement, and slip central gear forms the position of keeping off slowly with the meshing of low-speed external gear, and it.

Description

Main and auxiliary gear box assembly of mini-tiller

Technical Field

The utility model relates to the technical field of agricultural machinery, specifically a plough quick-witted major-minor gearbox assembly a little.

Background

The gearbox of the tillage machine in the market has the problem that the operation gear is inconvenient to switch, and the use efficiency is low.

The above background disclosure is only provided to aid in understanding the concepts and technical solutions of the present invention, and it does not necessarily belong to the prior art of the present patent application, and it should not be used to assess the novelty and inventive step of the present application without explicit evidence that the above content has been disclosed at the filing date of the present patent application.

Disclosure of Invention

The utility model aims at providing a plough quick-witted major-minor gearbox assembly a little in order to solve above-mentioned problem.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a main and auxiliary gearbox assembly of a mini-tiller comprises a main gearbox, a clutch box body and an auxiliary gearbox, wherein the main gearbox is connected with the clutch box body and the auxiliary gearbox and comprises a box body, a third shaft, a second shaft and a first shaft; the third shaft is provided with a low-speed external gear, a sliding central gear and a high-speed external gear, the two ends of the third shaft are optical axes, the low-speed external gear, the high-speed external gear and the two ends of the third shaft are in smooth static connection, a spline shaft is arranged in the middle of the third shaft, the spline shaft in the middle of the sliding central gear and the third shaft is in sliding connection through a spline, the inner sides of the low-speed external gear and the high-speed external gear are provided with inner circular teeth, the outer teeth of the sliding central gear can be embedded into the inner circular teeth of the low-speed external gear and the high-speed external gear to be meshed with the low-speed external gear and the high-speed external gear, so that the sliding central gear and the low-speed external gear or the sliding central gear; the second shaft is used as a steering shaft, the second shaft is provided with a jaw clutch device, the jaw clutch device comprises a central transmission large gear and two steering gears, the central transmission large gear and the two steering gears are arranged on the second shaft, the first shaft is a driving shaft positioned on two sides, each driving shaft is provided with a driving gear and is separated by a spacer bush, and the steering gears are constantly meshed with the driving gears.

The utility model discloses a stir the shift fork on the slip central gear and make slip central gear along axial displacement, slip central gear forms with low-speed external gear meshing and keeps off the position slowly, and slip central gear forms fast fender position with high-speed external gear meshing, and it is comparatively convenient to the switching that keeps off the position fast and slowly.

Drawings

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

Fig. 1 is a schematic sectional view of a main transmission case and a clutch case according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of the transmission system of the main transmission box and the transmission relationship between the transmission system and the auxiliary transmission box;

FIG. 3 is a schematic diagram of the auxiliary transmission system of the present invention;

in the figure: a main gear box 1; a case 10; an eighth shaft 11; a driven bevel gear 111; an eighth transfer gear 112; a seventh shaft 12; a seventh duplex gear 121; a sixth shaft 13; a reverse gear 131; a sixth shaft drive gear 132; a fifth shaft 14; a first-gear drive gear 141; a reverse drive gear 142; a transition gear 143; a second-third gear drive gear 144; a fourth axis 15; a reverse gear 151; a third-speed gear 152; a second gear 153; a third shaft 16; a low-speed outer gear 161; a sliding central gear 162; a high-speed external gear 163; a second shaft 17; a central drive gearwheel 171; a steering gear 172; a first shaft 18; a drive gear 181; a clutch housing 2; an engine end medium 21; a clutch assembly 22; a clutch lever 23; a clutch shaft 24; a drive bevel gear 25; a sub-transmission case 3; a sub transmission shaft 31; a secondary transmission secondary input gear 311; a range section input gear 312; a secondary gearbox secondary shaft 32; a range section input gear 321; a forward-reverse shift gear 322; the reverse rotation shaft 36; a counter-rotating double gear 361; a counter gearbox three shaft 33; a counter-gearbox three-shaft gear 331; a counter-gearbox intermediate gear 341; a counter gearbox countershaft 34; a rotary tillage shaft 35; rotary tillage gear 351.

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.

As shown in fig. 1, fig. 2 and fig. 3, the utility model discloses a mini-tiller main and auxiliary gearbox assembly with two-way output that preferred embodiment provided, including main gearbox 1, clutch housing 2 and auxiliary gearbox 3. The main gear box 1 is connected with the clutch box body 2 and the auxiliary gear box 3.

The clutch housing 2 includes an engine end member 21 for connecting with an engine, a clutch assembly 22, a clutch lever 23, a clutch shaft 24 for outputting engine power, and a driving bevel gear 25 connected to a distal end of the clutch shaft 24.

The main gear box 1 comprises a box body 10, an eighth shaft 11, a seventh shaft 12, a sixth shaft 13, a fifth shaft 14, a fourth shaft 15, a third shaft 16, a second shaft 17 and a first shaft 18, wherein shaft necks at two ends of each shaft are respectively provided with a bearing fixed on the box body 10.

The eighth shaft 11 is provided with a driven bevel gear 111 and an eighth transmission gear 112. The eighth shaft 11 is a spline shaft, the driven bevel gear 111 and the eighth shaft transmission gear 112 are statically connected with the eighth shaft 11 by a spline, and the driven bevel gear 111, the eighth shaft transmission gear 112 and the eighth shaft 11 synchronously rotate. The purpose of transmitting the power output by the engine to the eighth shaft 11 or cutting off the power transmitted to the eighth shaft 11 is achieved by controlling the driving bevel gear 25 on the clutch shaft 24 to be engaged with or disengaged from the driven bevel gear 111 by toggling the clutch lever 23.

The seventh shaft 12 is provided with a seventh shaft duplicate gear 121, and the seventh shaft duplicate gear 121 and the seventh shaft 12 are statically connected through a spline, so that the seventh shaft duplicate gear 121 and the seventh shaft 12 synchronously rotate. The seventh shaft duplicate gear 121 is in meshing transmission with the eighth shaft transmission gear 112.

The sixth shaft 13 is provided with a reverse gear 131 and a sixth shaft transmission gear 132, the sixth shaft transmission gear 132 is statically connected with the sixth shaft 13 through a spline, an inner ring of the reverse gear 131 is rotatably supported on the sixth shaft 13 through a bearing, the reverse gear 131 and the sixth shaft 13 rotate independently, and two ends of the reverse gear 131 are axially positioned through shaft retaining rings. The sixth shaft transmission gear 132 is in meshing transmission with the seventh shaft duplicate gear 121.

The fifth shaft 14 is provided with a first-gear driving gear 141, a reverse-gear driving gear 142, a transition gear 143, and a second-third-gear driving gear 144. The reverse drive gear 142 and the second-third drive gear 144 are dual gears. The fifth shaft 14 is a spline shaft, two ends of the transition gear 143 are axially positioned by using shaft retaining rings and are statically connected with the fifth shaft 14 spline, and the first-gear driving gear 141, the reverse-gear driving gear 142 and the second-third-gear driving gear 144 are slidably connected with the fifth shaft 14 by using the spline. The first gear driving gear 141, the reverse gear driving gear 142, and the second third gear driving gear 144 are axially moved along the fifth shaft 14 by a shift fork. And the shaft necks at the two ends of the fifth shaft 14 are respectively provided with a bearing. The transition gear 143 is in meshing transmission with the sixth shaft transmission gear 132.

The fourth shaft 15 is provided with a reverse gear 151, a third gear 152, and a second gear 153. The first reverse gear 151 is a duplicate gear, the fourth shaft 15 is an optical axis, and the first reverse gear 151, the third gear 152, the second gear 153 and the fourth shaft 15 are in smooth hole static connection. The shaft journals at the two ends of the fourth shaft 15 are respectively provided with bearings.

The third shaft 16 is provided with a low-speed external gear 161, a sliding center gear 162, and a high-speed external gear 163. The two ends of the third shaft 16 are optical axes, and the low-speed external gear 161 and the high-speed external gear 163 are statically connected with the two ends of the third shaft 16 through unthreaded holes. A spline shaft is arranged in the middle of the third shaft 16, the sliding central gear 162 is in sliding connection with the spline shaft in the middle of the third shaft 16 through a spline, and a fixed shifting fork (not shown) is connected to the sliding central gear 162. Inner teeth are formed on the inner sides of the low-speed external gear 161 and the high-speed external gear 163, and the outer teeth of the sliding center gear 162 are fitted into the inner teeth of the low-speed external gear 161 and the high-speed external gear 163 to be engaged with the low-speed external gear 161 and the high-speed external gear 163, so that the sliding center gear 162 and the low-speed external gear 161 or the sliding center gear 162 and the high-speed external gear 163 rotate in synchronization. The low-speed external gear 161 meshes with a pinion gear on the right side of the first reverse gear 151, and the high-speed external gear 163 meshes with the second gear 153.

The second-third gear driving gear 144 on the fifth shaft 14 is meshed with the second gear 153 and the third gear 152 on the fourth shaft 15 respectively to form a second gear and a third gear; a small gear on the right side of the reverse driving gear 142 on the fifth shaft 14 is meshed with the reverse gear 131 on the sixth shaft 13, and a large gear on the left side of the reverse driving gear 142 is meshed with a large gear on the left side of a reverse gear 151, so that a reverse gear is formed; a first-gear driving gear 141 on the fifth shaft 14 is meshed with a gearwheel on the right side of a reverse gear 151 to form a first gear; by shifting a shift fork on the slide center gear 162 to move the slide center gear 162 in the axial direction, the slide center gear 162 is engaged with the low-speed outer gear 161 to form a slow speed position, and the slide center gear 162 is engaged with the high-speed outer gear 163 to form a fast speed position.

The second shaft 17 is used as a steering shaft, the second shaft 17 is provided with a jaw clutch device, the jaw clutch device comprises a central transmission large gear 171 and two steering gears 172, the central transmission large gear 171 is fixed on the second shaft 17, the two steering gears 172 are positioned on two sides of the central transmission large gear 171 and can move axially, corresponding rectangular teeth are arranged on the central transmission large gear 171 and the two steering gears 172 and are arranged on the second shaft 17, the central transmission large gear 171 and the two steering gears 172 are pressed on the central transmission large gear 171 by a spring (not shown) during non-steering, power is transmitted by mutual embedding of the rectangular teeth, the steering gears 172 are moved by a shifting fork during steering, and the rectangular teeth are separated to realize steering. The central drive gearwheel 171 meshes with the sliding central gear 162.

The first shaft 18 is a drive shaft on both sides, each of which is provided with a drive gear 181 and separated by a spacer, and the steering gear 172 is in constant mesh with the drive gear 181. The driving shaft is provided with a driving wheel (not shown) which has the functions of walking and rolling.

The auxiliary gearbox 3 is connected with the main gearbox 1 and fixed by screws. A secondary gearbox second-gear input gear 311 and a secondary gearbox first-gear input gear 312 are arranged on a secondary gearbox first shaft 31 arranged in the secondary gearbox 3, and the secondary gearbox second-gear input gear 311 and the secondary gearbox first-gear input gear 312 are statically connected with the secondary gearbox first shaft 31 through splines. An auxiliary gearbox input gear 321 arranged in the auxiliary gearbox 3 is fixedly connected with an auxiliary gearbox secondary shaft 32 through a spline and is slidably connected with a forward and reverse gear shifting gear 322 through a spline. The counter-rotating duplicate gear 361 is fixed on the counter-rotating shaft 36 in the auxiliary gearbox 3 and is in spline static connection. An auxiliary gearbox three-shaft gear 331 is arranged on an auxiliary gearbox three-shaft 33 in the auxiliary gearbox 3, and two groups of auxiliary gearbox intermediate gears 341 and auxiliary gearbox intermediate shafts 34 are arranged in the auxiliary gearbox 3. The rotary tillage shaft 35 arranged in the auxiliary gearbox 3 is provided with a rotary tillage gear 351 which is statically connected by a spline. The arrangement from the auxiliary gearbox shaft 31 to the rotary tillage shaft 35 and related gears realizes the conversion of different rotating speeds of the rotary tillage shaft 35 and the forward and reverse rotation functions. The forward and reverse gear shifting gear 322 is provided with a rotary tillage handle (not shown) for controlling the forward and reverse gear shifting gear 322 to move along the axial direction. Bearings are arranged on the shaft necks at the two ends of each shaft. Different ploughing can be realized by mounting different machines on the rotary tillage shaft 35.

A third-gear input gear (not shown) of the auxiliary gearbox is also arranged on an auxiliary gearbox shaft 31 arranged in the auxiliary gearbox 3, and the third-gear input gear of the auxiliary gearbox is statically connected with the auxiliary gearbox shaft 31 by a spline.

The secondary gearbox input gear 311 meshes with the auxiliary gearbox input gear 321, the auxiliary gearbox three-shaft gear 331 meshes with the first auxiliary gearbox intermediate gear 341, the first auxiliary gearbox intermediate gear 341 meshes with the second auxiliary gearbox intermediate gear 341, and the second auxiliary gearbox intermediate gear 341 meshes with the rotary tillage gear 351.

A left pinion of a second-third gear driving gear 144 on a fifth shaft 14 is meshed with a second-gear input gear 311 of the auxiliary gearbox on a first shaft 31 of the auxiliary gearbox to form a first gear of the auxiliary gearbox, a first-gear driving gear 141 on the fifth shaft 14 is meshed with a first-gear input gear 312 of the auxiliary gearbox on the first shaft 31 of the auxiliary gearbox to form a second gear of the auxiliary gearbox, a right gearwheel of the second-third gear driving gear 144 on the fifth shaft 14 is meshed with a third-gear input gear of the auxiliary gearbox on the first shaft 31 of the auxiliary gearbox to form a third gear of the auxiliary gearbox, and the rotary tillage shafts 35 work at.

The forward and reverse rotation gear shifting gear 322 is directly meshed with the auxiliary gearbox three-shaft gear 331 on the auxiliary gearbox three-shaft 33, so that the rotary tillage shaft 35 rotates forward; the forward and reverse gear shifting gear 322 is engaged with the large gear on the right side of the reverse duplicate gear 361, and the small gear on the left side of the reverse duplicate gear 361 is engaged with the three-shaft gear 331 of the auxiliary gearbox, so that the rotary tillage shaft 35 rotates reversely.

The utility model discloses a stir the shift fork on the slip central gear 162 and make slip central gear 162 follow axial displacement, slip central gear 162 and the meshing of low-speed external gear 161 form and keep off the position slowly, slip central gear 162 and the meshing of high-speed external gear 163 form and keep off the position soon, and it is comparatively convenient to the switching of the position of keeping off the position soon.

Additionally, the utility model discloses compact structure is light and handy, keeps off the position and distributes rationally, and the operation keeps off the position many, and convenient the control, the availability factor is high, the configuration the utility model discloses a plough machine a little of major-minor gearbox can realize multiple operation functions such as plow harrow, rotary tillage, intertillage earthing up, ridging, can satisfy user's different operation demands.

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 plough quick-witted major-minor gearbox assembly a little which characterized in that: the transmission comprises a main gearbox, a clutch box body and an auxiliary gearbox, wherein the main gearbox is connected with the clutch box body and the auxiliary gearbox and comprises a box body, a third shaft, a second shaft and a first shaft; the third shaft is provided with a low-speed external gear, a sliding central gear and a high-speed external gear, the two ends of the third shaft are optical axes, the low-speed external gear, the high-speed external gear and the two ends of the third shaft are in smooth hole static connection, the middle of the third shaft is provided with a spline shaft, the sliding central gear and the spline shaft in the middle of the third shaft are in sliding connection through a spline, the sliding central gear is connected with a fixed shifting fork, the inner sides of the low-speed external gear and the high-speed external gear are provided with inner circular teeth, the outer circular teeth of the sliding central gear can be embedded into the inner circular teeth of the low-speed external gear and the high-speed external gear to be meshed with the low-speed external gear and the high-speed external gear, so that the sliding central gear and the low-speed external; the second shaft is used as a steering shaft, the second shaft is provided with a jaw clutch device, the jaw clutch device comprises a central transmission large gear and two steering gears, the central transmission large gear and the two steering gears are arranged on the second shaft, the first shaft is a driving shaft positioned on two sides, each driving shaft is provided with a driving gear and is separated by a spacer bush, and the steering gears are constantly meshed with the driving gears.

2. The main and auxiliary gearbox assembly of the mini-tiller according to claim 1, wherein: the clutch box body comprises an engine end medium used for being connected with an engine, a clutch assembly, a clutch hand lever, a clutch shaft used for outputting the power of the engine and a driving bevel gear connected to the tail end of the clutch shaft, the main gearbox further comprises an eighth shaft, a driven bevel gear and an eighth shaft transmission gear are arranged on the eighth shaft, the eighth shaft is a spline shaft, the driven bevel gear and the eighth shaft are statically connected through a spline, the driven bevel gear, the eighth shaft transmission gear and the eighth shaft synchronously rotate, and the driving 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, so that the power output by the engine is transmitted to the eighth shaft or the power transmitted to the eighth shaft is cut off.

3. The main and auxiliary gearbox assembly of the mini-tiller according to claim 2, wherein: the main gearbox further comprises a seventh shaft, a seventh shaft duplicate gear is arranged on the seventh shaft, the seventh shaft duplicate gear and the seventh shaft are in static connection through a spline, the seventh shaft duplicate gear and the seventh shaft rotate synchronously, and the seventh shaft duplicate gear and the eighth shaft transmission gear are in meshing transmission.

4. The main and auxiliary gearbox assembly of the mini-tiller of claim 3, wherein: the main gearbox further comprises a sixth shaft, a reverse gear and a sixth shaft transmission gear are arranged on the sixth shaft, the sixth shaft transmission gear and the sixth shaft are in static connection through splines, an inner ring of the reverse gear is rotatably supported on the sixth shaft through a bearing, the reverse gear and the sixth shaft rotate independently, two ends of the reverse gear are axially positioned through shaft check rings, and the sixth shaft transmission gear and a seventh shaft duplicate gear are in meshing transmission.

5. The main and auxiliary gearbox assembly of the mini-tiller of claim 4, wherein: the main gearbox further comprises a fifth shaft, a first-gear driving gear, a reverse-gear driving gear, a transition gear and a second-third-gear driving gear are arranged on the fifth shaft, the reverse-gear driving gear and the second-third-gear driving gear are duplicate gears, the fifth shaft is a spline shaft, two ends of the transition gear are axially positioned by using a shaft retainer ring and are statically connected with the fifth shaft spline, the first-gear driving gear, the reverse-gear driving gear, the second-third-gear driving gear and the fifth shaft are in sliding connection by using splines, the first-gear driving gear, the reverse-gear driving gear and the second-third-gear driving gear are controlled by a shifting fork to axially move along the fifth shaft, and the transition.

6. The main and auxiliary gearbox assembly of the mini-tiller of claim 5, wherein: the main gearbox also comprises a fourth shaft, wherein a reverse gear, a third gear and a second gear are arranged on the fourth shaft, the reverse gear is a duplicate gear, the fourth shaft is an optical axis, the reverse gear, the third gear, the second gear and the fourth shaft are in smooth hole static connection, the low-speed external gear is meshed with a pinion on the right side of the reverse gear, the high-speed external gear is meshed with the second gear, and a second three-gear driving gear on the fifth shaft is respectively meshed with a second gear and a third gear on the fourth shaft to form a second gear and a third gear; a small gear on the right side of a reverse gear driving gear on a fifth shaft is meshed with a reverse gear on a sixth shaft, and a large gear on the left side of the reverse gear driving gear is meshed with a large gear on the left side of a reverse gear, so that a reverse gear is formed; and a first gear driving gear on the fifth shaft is meshed with a large gear on the right side of a reverse gear to form a first gear.

7. The main and auxiliary gearbox assembly of the mini-tiller of claim 6, wherein: the central transmission gear wheel is fixed on the second shaft, 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 which are arranged on the second shaft, the central transmission gear wheel is pressed on the central transmission gear wheel by a spring when the central transmission gear wheel and the two steering gears are not in steering, power is transmitted by mutual embedding of the rectangular teeth, the steering gears are moved by a shifting fork when the central transmission gear wheel and the central transmission gear wheel are in steering, the rectangular teeth are separated, and the central transmission gear wheel and the.

8. The main and auxiliary gearbox assembly of the mini-tiller of claim 7, wherein: the auxiliary gearbox is characterized in that a secondary gearbox secondary input gear and a secondary gearbox primary input gear are arranged on a primary gearbox shaft arranged in the auxiliary gearbox, the secondary gearbox secondary input gear and the secondary gearbox primary input gear are statically connected with the primary gearbox shaft through splines, a secondary gearbox secondary shaft arranged in the auxiliary gearbox is provided with a secondary gearbox input gear which is statically connected through splines and is slidingly connected through splines, a counter rotating shaft in the auxiliary gearbox is provided with a counter rotating duplicate gear which is statically connected through splines, a secondary gearbox three-shaft gear is arranged on a secondary gearbox three-shaft in the auxiliary gearbox, two sets of secondary gearbox intermediate gears and secondary gearbox intermediate shafts are arranged in the auxiliary gearbox, and a rotary tillage shaft arranged in the secondary gearbox is provided with a rotary tillage gear which is statically connected through splines.

9. The main and auxiliary gearbox assembly of the mini-tiller of claim 8, wherein: a third-gear input gear of the auxiliary gearbox is further arranged on an auxiliary gearbox shaft arranged in the auxiliary gearbox, the third-gear input gear of the auxiliary gearbox is statically connected with the auxiliary gearbox shaft through a spline, a second-gear input gear of the auxiliary gearbox is meshed with the input gear of the auxiliary gearbox, a third-shaft gear of the auxiliary gearbox is meshed with a middle gear of a first auxiliary gearbox, a middle gear of the first auxiliary gearbox is meshed with a middle gear of a second auxiliary gearbox, a middle gear of a second auxiliary gearbox is meshed with a rotary tillage gear, a left small gear of a second third-gear driving gear on a fifth shaft is meshed with a second-gear input gear of the auxiliary gearbox on the auxiliary gearbox shaft to form a first gear of the auxiliary gearbox, a first-gear driving gear on the fifth shaft is meshed with a first-gear input gear of the auxiliary gearbox on the auxiliary gearbox shaft to form a second gear of the auxiliary gearbox, and a right large gear of the second third.

10. The main and auxiliary gearbox assembly of the mini-tiller of claim 9, wherein: the positive and negative rotation gear shifting gears are directly meshed with the three-shaft gear of the auxiliary gearbox on the three shafts of the auxiliary gearbox, so that the rotary tillage shaft rotates in a positive direction; the forward and reverse gear shifting gears are firstly meshed with the large gear on the right side of the reverse duplicate gear, and the small gear on the left side of the reverse duplicate gear is then meshed with the three-shaft gear of the auxiliary gearbox, so that the rotary tillage shaft rotates reversely.