CN220505741U

CN220505741U - Gearbox and mini-tiller

Info

Publication number: CN220505741U
Application number: CN202322203851.3U
Authority: CN
Inventors: 韩益田; 金冠宇; 肖国平; 胡桓烽
Original assignee: Chongqing Huashidan Agricultural Equipment Manufacturing Co ltd
Current assignee: Chongqing Huashidan Agricultural Equipment Manufacturing Co ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-02-20
Anticipated expiration: 2033-08-16

Abstract

The utility model relates to the technical field of agricultural machinery and discloses a gearbox, which comprises a box body and a main shaft positioned in the box body, wherein a first auxiliary shaft and a second auxiliary shaft are arranged in the box body; the main shaft is connected with a gear shifting gear and a duplex gear, the gear shifting gear is provided with a gear shifting mechanism for shifting the gear shifting gear to slide along the axial direction of the main shaft, a first driven gear, a triple gear and a second driven gear are sequentially arranged on the first auxiliary shaft, and a third driven gear is arranged on the second auxiliary shaft in an empty sleeve manner; the double gear comprises a first gear and a second gear, and the triple gear comprises a third gear, a fourth gear and a fifth gear; the fifth gear is normally meshed with the first gear, and the second gear is normally meshed with the second driven gear; the shift gear is engageable with the first driven gear; the shift gear is engageable with the third gear; the shift gear may be meshed with a third driven gear, which is in constant mesh with a fourth gear. The utility model can assist an operator to save more labor when operating the mini-tiller.

Description

Gearbox and mini-tiller

Technical Field

The utility model relates to the technical field of agricultural machinery, in particular to a gearbox and a mini-tiller.

Background

In order to improve cultivation efficiency, agricultural machinery is often used for auxiliary cultivation in daily cultivation. The mini-tiller is an agricultural machine with more frequently used, is a small-sized tillage machine mainly used for agricultural operation, is used for auxiliary tillage of seed fields, and is generally used for field tillage, ditching, ridging, weeding and fertilizing.

At present, in the process of using a mini-tiller to cultivate, when the soil texture of the cultivated land is hard, the mini-tiller needs to be manually slowed down, so that the torque output by a mini-tiller blade is increased, and then the mini-tiller blade can be effectively cultivated (namely, the mini-tiller blade is used for turning up the soil), the mini-tiller handle frame is held by a hand and is used for pressing the mini-tiller handle frame downwards, at the moment, the mini-tiller is prevented from advancing due to the fact that the hand presses the mini-tiller handle frame downwards and the mini-tiller resistance blade is positioned in the soil, the overall speed of the mini-tiller is slowed down, the rotation speed of the mini-tiller blade is slowed down, and the output torque is increased, so that the land is effectively cultivated, but the hand is required to press the mini-tiller handle frame downwards with great effort all the time.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a gearbox which can effectively reduce the walking speed of a mini-tiller during cultivation, so that an operator can easily control the mini-tiller to achieve the purpose of decelerating the mini-tiller during cultivation of harder soil, and the operation of the mini-tiller can be more labor-saving.

The technical scheme adopted by the utility model is as follows: the gearbox comprises a box body and a main shaft positioned in the box body, wherein a first auxiliary shaft used for outputting power of the gearbox and a second auxiliary shaft used for setting a reverse gear are arranged in the box body, and the main shaft, the first auxiliary shaft and the second auxiliary shaft are parallel in different planes;

the main shaft is fixedly connected with a gear shifting gear and the empty sleeve is provided with a duplex gear, the gear shifting gear is provided with a gear shifting mechanism for shifting the gear shifting gear to slide along the axial direction of the main shaft, the first auxiliary shaft is sequentially provided with a first driven gear, a triple gear and a second driven gear, the first driven gear and the second driven gear are fixedly connected with the first auxiliary shaft, the triple gear is connected with the empty sleeve of the first auxiliary shaft, and the empty sleeve of the second auxiliary shaft is provided with a third driven gear;

the double gear comprises a first gear and a second gear, and the triple gear comprises a third gear, a fourth gear and a fifth gear;

the fifth gear is in constant mesh with the first gear, and the second gear is in constant mesh with the second driven gear, so that two-stage speed reduction is realized;

the shift gear can be meshed with the first driven gear for realizing second gear output;

the gear shifting gear can be meshed with the third gear to realize first-gear low-speed output;

the gear shifting gear can be meshed with a third driven gear, and the third driven gear is meshed with a fourth gear normally for realizing reverse gear low-speed output.

Explanation: one end of the clutch is connected with the engine, the other end of the clutch is connected with the main shaft, the engine is started and drives the clutch to rotate, the clutch drives the main shaft to rotate, the clutch is connected with a shifting fork for cutting off the power flow of the engine, and the shifting fork is connected with a shifting fork arm for controlling the shifting fork and connected with the outer surface of the box body.

The principle of the technical proposal is as follows:

before the main shaft rotates, a gear shifting gear is arranged between the third gear and the fourth gear, namely the gear shifting gear is positioned at a neutral position;

when the main shaft rotates, the shifting gear is driven to rotate, when a lower-speed forward gear is required, the shifting fork arm is pulled in a hand manner, the clutch is pressed by a shifting fork connected with the shifting fork arm, so that the power of the gearbox is cut off, meanwhile, the shifting mechanism is controlled by the other hand and is slid to a designated position, the shifting mechanism slides to drive the shifting gear to slide on the main shaft along the axial direction of the main shaft, the shifting gear is meshed with the third gear, the shifting gear drives the third gear to rotate on the first auxiliary shaft, the third gear and the fifth gear are positioned on the triple gear, the triple gear is sleeved on the first auxiliary shaft in an empty manner, namely, the rotation of the triple gear does not influence the rotation of the first auxiliary shaft, but the third gear drives the fifth gear to rotate together, and the fifth gear is meshed with the first gear, the second gear is meshed with the second driven gear in a constant manner, the fifth gear drives the first gear, the second gear and the second driven gear rotate in sequence, the second driven gear is fixedly connected with the first auxiliary shaft, the second driven gear drives the first auxiliary shaft to rotate, and the first auxiliary shaft rotates, and the first auxiliary shaft drives the first auxiliary shaft to rotate, so that the micro-cultivator drives the forward power at lower speed;

when a higher-speed forward gear is needed, the rotating speed of the main shaft is increased firstly to drive the shift gear to rotate quickly, then the shift fork arm is pulled by hand, the clutch is pressed by the shift fork connected with the shift fork arm, so that the power of the gearbox is cut off, meanwhile, the shift mechanism is controlled by the other hand, and is slid to a designated position, when the shift mechanism slides, the shift gear is driven to slide on the main shaft along the axial direction of the main shaft, the shift gear is meshed with the third gear to be meshed with the first driven gear, the shift gear drives the first driven gear to rotate, and as the first driven gear is fixedly connected with the first auxiliary shaft, the first auxiliary shaft is driven to rotate when the first driven gear rotates, the first auxiliary shaft outputs the power of the gearbox, so that the mini-tiller is driven to advance;

when the reversing is needed, the rotating speed of the main shaft is reduced, the rotating speed of the gear shifting is driven to be reduced, then the shifting fork arm is pulled, the clutch is pressed by the shifting fork connected with the shifting fork arm, so that the power of the gearbox is cut off, the other hand controls the gear shifting mechanism, the gear shifting mechanism is slid to a designated position, the gear shifting mechanism drives the gear shifting gear to slide on the main shaft along the axial direction of the main shaft when being slid, the gear shifting gear is meshed with the first driven gear and adjusted to be meshed with the third gear, the rotating speed of the main shaft is reduced again, the rotating speed of the gear shifting gear is driven to be reduced, then the shifting fork arm is pulled, the clutch is pressed by the shifting fork connected with the shifting fork arm, so that the power of the gearbox is cut off, the other hand controls the gear shifting mechanism is slid to the designated position, the gear shifting mechanism is driven to slide on the main shaft along the axial direction of the main shaft when the gear shifting mechanism slides, the gear shift gear is meshed with the third driven gear, the gear shift gear drives the third driven gear to rotate, the third driven gear is meshed with the fourth gear, the third driven gear drives the fourth gear to rotate when rotating, the fourth gear rotates without influencing the rotation state of the first auxiliary shaft, the gear shift gear is meshed with the third driven gear firstly and then drives the fourth gear to rotate through the third driven gear, the rotation direction of the fourth gear is opposite to the rotation direction of the third gear and the first driven gear before, the fifth gear is driven to rotate when the fourth gear rotates, the fifth gear is meshed with the first gear, the second gear is meshed with the second driven gear, the fifth gear drives the first gear, the second gear and the second driven gear to rotate in sequence, two-gear speed reduction is realized, the second driven gear is fixedly connected with the first auxiliary shaft, the first auxiliary shaft is driven to rotate when the second driven gear rotates, and the first auxiliary shaft outputs power of the gearbox, so that the mini-tiller is driven to reverse at a lower speed.

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

1. according to the utility model, the fifth gear, the duplex gear and the second driven gear are matched to realize two-time speed reduction, and then the gear shifting gear and the third gear are matched, so that the advancing speed of the mini-tiller is lower than the speed of a person in walking, the mini-tiller can slowly advance, when the cultivated soil of the mini-tiller is harder, an operator only needs to lightly press down the mini-tiller armrest frame when holding the mini-tiller armrest frame, slow cultivation of the mini-tiller can be realized, the speed reduction of the mini-tiller can be realized by manual assistance, the rotating speed of a mini-tiller cutter is reduced, the output torque is increased, the mini-tiller cutter can effectively turn soil, the force is saved for the operator, the advancing speed of the mini-tiller is lower than the walking speed of the person, and the use safety of the mini-tiller can be effectively improved;

2. the gear shifting gear and the first driven gear cooperate to realize a faster advancing speed, and the gear shifting gear can be suitable for an operator to operate the mini-tiller when in transition (the transition refers to from one place to another place), so that the mini-tiller can normally and quickly walk;

3. according to the utility model, the gear shifting gear, the third driven gear, the fourth gear, the fifth gear, the duplex gear and the second driven gear are matched to act, and the mini-tiller can realize a reverse speed with a lower speed through two times of speed reduction, so that the mini-tiller slowly backs up, and the safety in the use process is improved.

As a preferred embodiment of the present utility model, the first gear root circle diameter is larger than the second gear root circle diameter, the root circle diameters of the first driven gear and the third gear are both larger than the gear-shift gear root circle diameter, the root circle diameters of the third gear, the fourth gear and the fifth gear are sequentially from large to small, the fifth gear root circle diameter is smaller than the first gear root circle diameter, the second gear root circle diameter is smaller than the second driven gear root circle diameter, the first driven gear is at a distance from the third gear, the third driven gear root circle diameter is larger than the gear-shift gear root circle diameter, and the third driven gear root circle diameter is smaller than the fourth gear root circle diameter.

In this scheme, the diameter of third gear root circle is greater than the diameter of gear root circle of shifting gears, the rotational speed of third gear relative gear of shifting gears reduces, fifth gear root circle diameter is less than first gear root circle diameter, when fifth gear drove first gear and rotate, the rotational speed of first gear relative fifth gear reduces, second driven gear root circle diameter is greater than second gear root circle diameter, when second gear drove second driven gear and rotate, the rotational speed of second driven gear relative second gear reduces again, third driven gear root circle diameter is less than fourth gear root circle diameter, when third driven gear drove fourth gear and rotate, the rotational speed of fourth gear relative third driven gear reduces.

The beneficial effect of this scheme: the diameter of the fifth gear root circle is smaller than that of the first gear root circle, and the diameter of the second gear root circle is smaller than that of the second driven gear root circle, so that the speed reduction can be effectively realized twice; the diameter of the third driven gear root circle is smaller than that of the fourth driven gear root circle, and one-time speed reduction can be effectively achieved.

As a preferred embodiment of the utility model, the gear shifting mechanism comprises a gear shifting block for shifting a gear shifting gear, the gear shifting block comprises a first supporting part, a second supporting part and a third supporting part, the second supporting part and the third supporting part are respectively positioned at two ends of the first supporting part and are in the same direction, and the gear shifting gear is partially positioned in a cavity formed by encircling the first supporting part, the second supporting part and the third supporting part.

The beneficial effect of this scheme: the shifting block can drive the shifting gear to slide along the axial direction of the main shaft, so that the shifting gear can be meshed with the gear corresponding to the gear, and the switching of different gears is realized.

As a preferred embodiment of the utility model, the gear shifting mechanism further comprises a gear shifting fork shaft, a handle, a gear limiting plate and a limiting assembly, wherein one end of the gear shifting fork shaft is rotationally connected with a gear shifting block, the other end of the gear shifting fork shaft is fixedly connected with the handle, the handle is rotationally connected with the box body, the gear limiting plate is connected with the outer surface of the box body, the gear limiting plate is provided with a Z-shaped through hole, the handle penetrates through the through hole, the gear limiting plate is provided with a gear mark, the limiting assembly comprises a connecting part, a spring connected with the connecting part and a steel ball connected with the spring, the connecting part is connected with the box body, and the gear shifting fork shaft is provided with a limiting hole which can be clamped with the steel ball.

The beneficial effect of this scheme: the handle can be convenient for control and dial the shelves piece and slide, and the gear limiting plate is convenient for the operator to slide the handle and corresponds gear sign department, and then is convenient for accurately adjust the shelves piece to assigned position department, accomplishes the gear shift operation, and Z shape's via hole can be convenient for carry out spacingly to the handle, prevents that the handle from sliding when the mini-tiller is not used, and spacing subassembly and spacing hole cooperation effect can be spacing to dialling the shelves piece, prevent to dial the shelves piece and slide.

As a preferable embodiment of the utility model, the main shaft is fixedly connected with a first check ring and a first bearing, the main shaft is arranged on the box body through the first bearing, the gear shifting gear is connected with a convex circle for playing a role in buffering, and the gear shifting block is abutted against the convex circle.

The beneficial effect of this scheme: the first check ring and the first bearing are matched, so that the main shaft can be arranged on the box body, the gear shifting gear can be limited, the convex circle can increase the stability of connection between the gear shifting gear and the main shaft, and the gear shifting block can be limited by the matching action of the gear shifting gear.

According to the utility model, as a preferred embodiment, the main shaft is sequentially and fixedly connected with a second check ring, a second bearing and a sealing ring, two end surfaces of the duplex gear are respectively abutted with the second check ring and the second bearing, and the main shaft is arranged on the box body through the second bearing and the sealing ring.

The beneficial effect of this scheme: the second check ring and the second bearing cooperate to limit the duplex gear.

According to the utility model, as a preferred embodiment, the first auxiliary shaft is fixedly connected with a third bearing, a fourth bearing and a blank cap in sequence, the first auxiliary shaft is arranged on the box body through the third bearing, the fourth bearing and the blank cap, and the first driven gear, the triple gear and the second driven gear are positioned between the third bearing and the fourth bearing.

The beneficial effect of this scheme: the third bearing and the fourth bearing are matched, and the first driven gear, the triple gear and the second driven gear can be limited.

In a preferred embodiment of the present utility model, the first driven gear, the triple gear and the second driven gear are provided with first abutting portions for limiting, the first driven gear abuts against the third bearing and the first abutting portion of the triple gear respectively through the first abutting portions of the first driven gear, and the second driven gear abuts against the first abutting portion and the fourth bearing of the triple gear respectively through the first abutting portions of the second driven gear.

The beneficial effect of this scheme: the first abutting portion can enable gaps to be reserved between adjacent third bearings, the first driven gear, the triple gear, the second driven gear and the fourth bearings, gear shifting is facilitated, and the positions of the first driven gear, the triple gear and the second driven gear are relatively fixed on the first auxiliary shaft.

In a preferred embodiment of the present utility model, one end of the second auxiliary shaft is clamped with the box body, a third retaining ring and a fourth retaining ring are respectively arranged at two ends of a clamping part of the second auxiliary shaft and the box body, a resisting part is arranged at one end of the second auxiliary shaft far away from the box body, the third driven gear is located between the fourth retaining ring and the resisting part, a second abutting part for playing a limiting role is connected to one side of the third driven gear close to the fourth retaining ring, one end face of the third driven gear abuts against the inner side face of the resisting part, and the second abutting part abuts against the outer side face of the fourth retaining ring.

The beneficial effect of this scheme: the fourth retainer ring and the resisting part are matched to limit the third driven gear.

It is a second object of the present utility model to provide a mini-tiller comprising a gearbox as described above.

Drawings

FIG. 1 is a schematic structural view of a transmission of the present utility model;

FIG. 2 is a schematic partial construction of a transmission of the present utility model;

FIG. 3 is an exploded view of the transmission of the present utility model;

FIG. 4 is a schematic view of another angular configuration of the transmission of the present utility model;

FIG. 5 is a schematic view of yet another angle of the transmission of the present utility model.

Detailed Description

Exemplary embodiments that embody features and advantages of the present utility model will be set forth in detail in the following description. It will be understood that the utility model is capable of various modifications in various embodiments, all without departing from the scope of the utility model, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the utility model.

In the description of the present application, the orientation or positional relationship indicated by the terms "first", "second", "one side", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present application and to simplify the description, rather than to indicate or imply that the structure referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The present utility model will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The reference numerals include: the gear box comprises a box body 1, a main shaft 2, a first auxiliary shaft 3, a second auxiliary shaft 4, a gear shifting gear 5, a duplicate gear 6, a gear shifting mechanism 7, a first driven gear 8, a triple gear 9, a second driven gear 10, a third driven gear 11, a first gear 12, a second gear 13, a third gear 14, a fourth gear 15, a fifth gear 16, a shifting block 17, a gear shifting fork shaft 18, a handle 19, a gear limiting plate 20, a limiting assembly 21, a through hole 22, a connecting part 23, a spring 24, a steel ball 25, a limiting hole 26, a first retainer ring 27, a first bearing 28, a convex circle 29, a second retainer ring 30, a second bearing 31, a sealing ring 32, a third bearing 33, a fourth bearing 34, a blank 35, a first abutting part 36, a third retainer ring 37, a fourth retainer ring 38, a blocking part 39, a second abutting part 40 and a gearbox 41.

As shown in fig. 1 to 5, a gearbox comprises a box body 1 and a main shaft 2 positioned in the box body 1, wherein a first auxiliary shaft 3 for outputting power of the gearbox and a second auxiliary shaft 4 for setting a reverse gear are arranged in the box body 1, and the main shaft 2, the first auxiliary shaft 3 and the second auxiliary shaft 4 are parallel in different surfaces.

As shown in fig. 2 and 3, a first retainer ring 27, a first bearing 28, a gear shifting gear 5, a second retainer ring 30, a duplex gear 6, a second bearing 31 and a sealing ring 32 are sequentially arranged on the main shaft 2, one end of the main shaft 2 is arranged on the box body through the first bearing 28, the other end of the main shaft 2 is arranged on the box body 1 through the second bearing 31 and the sealing ring 32, the first retainer ring 27, the second retainer ring 30 and the sealing ring 32 are fixedly arranged on the main shaft 2, the gear shifting gear 5 is in spline connection with the main shaft 2, the gear shifting gear 5 is connected with a convex circle 29 for playing a buffering role, the convex circle 29 can be abutted with the first bearing 28, and the gear shifting gear 5 is provided with a gear shifting mechanism 7 for shifting the gear shifting gear 5 along the axial direction of the main shaft 2.

As shown in fig. 3, fig. 4 and fig. 5, the gear shifting mechanism 7 comprises a shifting block 17 for shifting the gear shifting wheel 5, a shifting fork shaft 18, a handle 19, a gear limiting plate 20 and a limiting assembly 21, wherein the shifting block 17 comprises a first supporting part, a second supporting part and a third supporting part, the second supporting part and the third supporting part are respectively positioned at two ends of the first supporting part and are in the same direction, the gear shifting wheel 5 is partially positioned in a containing cavity formed by encircling the first supporting part, the second supporting part and the third supporting part, the shifting block 17 is abutted against a convex circle 29, one end of the shifting fork shaft 18 is rotationally connected with the shifting block 17, the other end of the shifting fork shaft 19 is fixedly connected with the handle 19, the handle 19 is rotationally connected with the box 1, the gear limiting plate 20 is connected with the outer surface of the box 1, the gear limiting plate 20 is provided with a Z-shaped through hole 22, the handle 19 passes through the through hole 22, the gear limiting plate 20 is provided with four gear identifiers 1, 2 and N, R, the limiting assembly 21 comprises a connecting part 23, a spring 24 connected with the connecting part 23 and a steel ball 25 connected with the connecting part 24, the steel ball 25 is connected with the connecting part 23, the box 1 is connected with the steel ball 25, and the box 18 is connected with the steel ball 25.

As shown in fig. 2, the duplex gear 6 is sleeved on the main shaft 2 in an empty mode, two end faces of the duplex gear 6 are respectively abutted with the second check ring 30 and the second bearing 31, the duplex gear 6 comprises a first gear 12 and a second gear 13, and the diameter of a root circle of the first gear 12 is larger than that of the second gear 13.

The first auxiliary shaft 3 is sequentially provided with a third bearing 33, a first driven gear 8, a triple gear 9, a second driven gear 10, a fourth bearing 34 and a blank cap 35, one end of the first auxiliary shaft 3 is installed on the box body 1 through the third bearing 33, and the other end of the first auxiliary shaft is installed on the box body 1 through the fourth bearing 34 and the blank cap 35.

The first driven gear 8 and the second driven gear 10 are both in spline connection with the first auxiliary shaft 3, the gear shifting gear 5 can be meshed with the first driven gear 8 for realizing second gear output, the triple gear 9 is in blank connection with the first auxiliary shaft 3, the triple gear 9 comprises a third gear 14, a fourth gear 15 and a fifth gear 16, the gear shifting gear 5 can be meshed with the third gear 14 for realizing first gear output, the fifth gear 16 is meshed with the first gear 12 normally, and the second gear 13 is meshed with the second driven gear 10 normally for realizing two-stage speed reduction.

The first driven gear 8, the triple gear 9 and the second driven gear 10 are respectively provided with a first abutting part 36 for playing a limiting role, the first driven gear 8 is respectively abutted with the third bearing 33 and the first abutting part 36 on the triple gear 9 through the first abutting part 36 on the first driven gear 8, and the second driven gear 10 is respectively abutted with the first abutting part 36 on the triple gear 9 and the fourth bearing 34 through the first abutting part 36 on the second driven gear 10.

The root circle diameters of the first driven gear 8 and the third gear 14 are larger than the root circle diameter of the gear shifting gear 5, the root circle diameters of the third gear 14, the fourth gear 15 and the fifth gear 16 are sequentially from large to small, the root circle diameter of the fifth gear 16 is smaller than the root circle diameter of the first gear 12, the root circle diameter of the second gear 13 is smaller than the root circle diameter of the second driven gear 10, the first driven gear 8 is away from the third gear 14, and the root circle diameter of the third driven gear 11 is larger than the root circle diameter of the gear shifting gear 5.

As shown in fig. 2, one end of the second auxiliary shaft 4 is clamped with the box body 1, a third check ring 37 and a fourth check ring 38 are respectively arranged at two ends of the clamping part of the second auxiliary shaft 4 and the box body 1, as shown in fig. 3, a resisting part 39 is arranged at one end of the second auxiliary shaft 4, which is far away from the box body 1, a third driven gear 11 is arranged on the second auxiliary shaft 4 in an empty sleeve manner, the third driven gear 11 is positioned between the fourth check ring 38 and the resisting part 39, the gear shifting gear 5 can be meshed with the third driven gear 11, the third driven gear 11 is meshed with the fourth gear 15 normally, and is used for realizing reverse gear low-speed output, and the diameter of a tooth root circle of the third driven gear 11 is smaller than that of a tooth root circle of the fourth gear 15.

A second abutment portion 40 for limiting is connected to the third driven gear 11 on the side close to the fourth retainer 38, one end face of the third driven gear 11 abuts against the inner side face of the abutment portion 39, and the second abutment portion 40 abuts against the outer side face of the fourth retainer 38.

A mini-tiller comprising a gearbox 41 as described above.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims

1. The utility model provides a gearbox, includes box and the main shaft that is located the box, its characterized in that: a first auxiliary shaft for outputting the power of the gearbox and a second auxiliary shaft for setting a reverse gear are arranged in the box body, and the different surfaces of the main shaft, the first auxiliary shaft and the second auxiliary shaft are parallel;

2. A gearbox according to claim 1, characterised in that: the first gear root circle diameter is greater than the second gear root circle diameter, the root circle diameters of the first driven gear and the third gear are all greater than the gear tooth root circle diameter of the gear shifting, the root circle diameters of the third gear, the fourth gear and the fifth gear are sequentially from big to small, the root circle diameter of the fifth gear is smaller than the first gear root circle diameter, the root circle diameter of the second gear is smaller than the root circle diameter of the second driven gear, the first driven gear is away from the third gear, the root circle diameter of the third driven gear is greater than the root circle diameter of the gear shifting, and the root circle diameter of the third driven gear is smaller than the root circle diameter of the fourth gear.

3. A gearbox according to claim 1, characterised in that: the gear shifting mechanism comprises a gear shifting block used for shifting a gear shifting gear, the gear shifting block comprises a first supporting portion, a second supporting portion and a third supporting portion, the second supporting portion and the third supporting portion are respectively located at two ends of the first supporting portion and are in the same direction, and the gear shifting gear is located in a containing cavity formed by encircling the first supporting portion, the second supporting portion and the third supporting portion.

4. A gearbox according to claim 3, characterised in that: the gear shifting mechanism further comprises a gear shifting fork shaft, a handle, a gear limiting plate and a limiting assembly, wherein one end of the gear shifting fork shaft is rotationally connected with a shifting block, the other end of the gear shifting fork shaft is fixedly connected with the handle, the handle is rotationally connected with the box body, the gear limiting plate is connected with the outer surface of the box body, the gear limiting plate is provided with a Z-shaped through hole, the handle penetrates through the through hole, the gear limiting plate is provided with a gear mark, the limiting assembly comprises a connecting part, a spring connected with the connecting part and a steel ball connected with the spring, the connecting part is connected with the box body, and the gear shifting fork shaft is provided with a limiting hole which can be clamped with the steel ball.

5. A gearbox according to claim 3, characterised in that: the main shaft fixedly connected with first retaining ring and first bearing, the main shaft passes through first bearing and installs on the box, shift gear is connected with the bulge that is used for playing the cushioning effect, shift stop offsets with the bulge.

6. A gearbox according to claim 5, characterised in that: the main shaft is fixedly connected with a second check ring, a second bearing and a sealing ring in sequence, two end faces of the duplex gear are respectively abutted with the second check ring and the second bearing, and the main shaft is arranged on the box body through the second bearing and the sealing ring.

7. A gearbox according to claim 1, characterised in that: the first auxiliary shaft is sequentially and fixedly connected with a third bearing, a fourth bearing and a blank cap, the first auxiliary shaft is arranged on the box body through the third bearing, the fourth bearing and the blank cap, and the first driven gear, the triple gear and the second driven gear are located between the third bearing and the fourth bearing.

8. The gearbox of claim 7, wherein: the two end faces of the first driven gear, the triple gear and the second driven gear are respectively provided with a first abutting part for playing a limiting role, the first driven gear is respectively abutted with the first abutting part on the third bearing and the triple gear through the first abutting part on the first driven gear, and the second driven gear is respectively abutted with the first abutting part on the triple gear and the fourth bearing through the first abutting part on the second driven gear.

9. A gearbox according to claim 1, characterised in that: the utility model discloses a box, including box, driven gear, second countershaft, third countershaft, second countershaft, box joint position's both ends are equipped with third retaining ring and fourth retaining ring respectively, the one end that the box was kept away from to the second countershaft is equipped with the portion of keeping out, the third driven gear is located between fourth retaining ring and the portion of keeping out, one side that the third driven gear is close to the fourth retaining ring is connected with the second butt portion that is used for playing spacing effect, a terminal surface of third driven gear and the inside surface butt of portion of keeping out, second butt portion and fourth retaining ring lateral surface butt.

10. A mini-tiller, which is characterized in that: a gearbox comprising any of claims 1 to 9.