Transmission case applied to mini-tiller

Abstract

The utility model relates to the technical field of mini-tiller transmission cases, and discloses a transmission case applied to a mini-tiller, which comprises a driving shaft, a driven shaft and an auxiliary shaft, the driving shaft, the driven shaft and the auxiliary shaft are parallel in different planes, and a first gear, a second gear, a third gear and a fourth gear are sequentially sleeved on the driving shaft in an empty mode. The driven shaft is fixedly connected with a first driven gear, a second driven gear, a third driven gear and a fourth driven gear in sequence, and the auxiliary shaft is sleeved with a reversing gear in an empty mode; the reversing gear is constantly meshed with the first gear and the first driven gear, the second gear is constantly meshed with the second driven gear, the third gear is constantly meshed with the third driven gear, and the fourth gear is constantly meshed with the fourth driven gear. Two gear shifting wheels located between the first gear and the second gear and between the third gear and the fourth gear are fixedly connected to the driving shaft. Friction between tooth surfaces of the gear can be reduced, abrasion of the gear is relieved, and the service life of the gear is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission boxes for micro-tillage machines, in particular to a transmission box applied to micro-tillage machines. Background Art

[0002] At present, when the micro-tiller shifts gears, the shift gear on the driving shaft in the micro-tiller gearbox slides along the axial direction of the driving shaft and meshes with the corresponding driven gear on the driven shaft in the gearbox to achieve gear shifting. However, the shift gear slides and meshes with the corresponding driven gear. During the meshing process, there is relative sliding between the tooth surfaces of the shift gear and the driven gear, resulting in continuous friction between the tooth surfaces, which is easy to accelerate the wear of the tooth surfaces, that is, increase the wear of the gears, and shorten the service life of the gears. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a transmission box for a micro-tillage machine, which can reduce the friction between the gear tooth surfaces, slow down the wear of the gears, and extend the service life of the gears.

[0004] The technical solution adopted by the utility model is as follows: a transmission box applied to a micro-tillage machine comprises a driving shaft, a driven shaft and a countershaft, wherein the driving shaft, the driven shaft and the countershaft are all parallel to each other in different planes, the driving shaft is provided with a first gear, a second gear, a third gear and a fourth gear in an idle sleeve in sequence, the driven shaft is fixedly connected with a first driven gear, a second driven gear, a third driven gear and a fourth driven gear in sequence, and a reversing gear is provided in an idle sleeve on the countershaft;

[0005] The reversing gear is constantly meshed with the first gear and the first driven gear respectively, the second gear is constantly meshed with the second driven gear, the third gear is constantly meshed with the third driven gear, and the fourth gear is constantly meshed with the fourth driven gear;

[0006] The driving shaft is fixedly connected with two shift wheels respectively located between the first gear and the second gear, and between the third gear and the fourth gear, and the two shift wheels are provided with a shift mechanism for driving the corresponding shift wheel to slide along the axial direction of the driving shaft and connected with the corresponding gear;

[0007] The shift wheel is connected to the first gear, and the shift wheel, the first gear, the reversing gear, and the first driven gear are used together to achieve reverse gear output; the shift wheel is connected to the second gear, and the shift wheel, the second gear, and the second driven gear are used together to achieve first gear output; the shift wheel is connected to the third gear, and the shift wheel, the third gear, and the third driven gear are used together to achieve second gear output; the shift wheel is connected to the fourth gear, and the shift wheel, the fourth gear, and the fourth driven gear are used together to achieve third gear output.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] The first gear, the second gear, the third gear and the fourth gear are all arranged on the driving shaft with empty sleeves, the first driven gear, the second driven gear, the third driven gear and the fourth driven gear are all fixedly connected to the driven shaft, the reversing gear empty sleeve is arranged on the secondary shaft, and the reversing gear is respectively constantly meshed with the first gear and the first driven gear, the second gear and the second driven gear are constantly meshed, the third gear and the third driven gear are constantly meshed, and the fourth gear and the fourth driven gear are constantly meshed. In addition, the shift wheel is fixedly connected to the driving shaft, and the shift wheel can slide along the axial direction of the driving shaft to connect with the corresponding gear, so that when shifting gears, only the shift wheel needs to be slid, and the first gear, the second gear, the third gear, the fourth gear, and the first driven gear, the second driven gear, the third driven gear, the fourth driven gear and the reversing gear are all kept in a meshing state with the corresponding gears, thereby reducing the friction between the gears due to the sliding meshing tooth surfaces when shifting gears, slowing down the wear of the gears, and extending the service life of the gears.

[0010] As a preferred embodiment of the utility model, the first gear, the second gear, the third gear and the fourth gear are all circumferentially provided with a plurality of first slots, and both end surfaces of the shift wheel are circumferentially provided with a plurality of clamping columns that can be clamped into the first slots.

[0011] As a preferred embodiment of the utility model, it also includes a box body, and the shift mechanism includes a first limit shaft and a second limit shaft that are parallel to each other, two connecting components, and a limit component for controlling the rotation and limit of the second limit shaft;

[0012] The first limit shaft is fixedly connected to the box body, the connecting assembly includes a connecting piece and a ball, one end of the connecting piece can be rotatably connected to the shift wheel, and the other end is slidably matched with the first limit shaft, and the end of the connecting piece connected to the first limit shaft is rotatably connected to the ball;

[0013] The second limiting shaft is installed on the box body through a bearing. The second limiting shaft is provided with two multi-peak first annular grooves, and the balls can slide on the corresponding first annular grooves.

[0014] In this solution, the second limit shaft rotates and drives the ball to slide on the corresponding first annular groove. Since the first annular groove on the second limit shaft has multiple peaks, when the ball slides to the peak of the first annular groove, the ball drives the connecting piece to slide with the first limit shaft, and the connecting piece drives the shift wheel to slide along the axial direction of the driving shaft. The shift wheel is connected to the corresponding gear, driving the corresponding gear to rotate with the driving shaft, thereby realizing gear shifting output.

[0015] Beneficial effect: The first limit shaft can provide support for the connecting member, and the cooperation between the ball and the multi-peak first annular groove can drive the connecting member to slide axially along the first limit shaft, and drive the shift wheel to slide axially along the driving shaft through the connecting member to achieve gear shifting.

[0016] As a preferred embodiment of the utility model, the shift wheel is provided with a second annular groove, a limiting groove is provided on an opposite side wall of the second annular groove, the connecting member includes an arc portion, a first connecting portion and a second connecting portion, the arc portion, the first connecting portion and the second connecting portion are connected in sequence, the arc portion is slidably matched with the bottom of the second annular groove, the two ends of the arc portion are respectively extended into the corresponding limiting grooves, the second connecting portion is slidably matched with the first limiting shaft, and the second connecting portion is rotationally connected to the ball bearing.

[0017] As a preferred embodiment of the utility model, the limit assembly includes a handle for controlling the rotation of the second limit shaft and a limit member for limiting the handle after rotation. The handle is connected to the second limit shaft, and the handle and the second limit shaft are coaxial.

[0018] Beneficial effect: At present, when the riding micro-tiller shifts gears, the shift handle is controlled to move forward or backward to drive the shift fork to move on the gearbox driving shaft, thereby driving the shift gear to move on the driving shaft and engage with the corresponding gear to achieve the corresponding gear output. When the operator sits on the micro-tiller and operates the shift handle to shift gears, since the shift handle of the riding micro-tiller is located on one side of the steering wheel and in front of the seat of the riding micro-tiller, and the shift handle moves back and forth, when a high gear output is required, the shift handle needs to move forward in a direction away from the operator, and the distance between the shift handle and the operator increases. At this time, the upper body needs to lean forward to control the shift handle to move forward, which is inconvenient to operate. In this solution, the rotation of the handle drives the second limit shaft to rotate. No matter what gear is changed to, the distance between the handle and the operator remains unchanged, which can avoid increasing the distance between the shift handle and the operator's hand when shifting gears, and can be easy to operate.

[0019] As a preferred embodiment of the utility model, the limiting member includes a fixed plate fixedly connected to the box body and a limiting plate fixedly connected to the handle, the fixed plate, the limiting plate and the handle are coaxial, one end of the handle passes through the fixed plate and is rotatably connected to the fixed plate, a plurality of limiting holes are provided on a side of the fixed plate opposite to the limiting plate, the limiting plate is provided with a spring and a limiting ball, one end of the spring is connected to the limiting plate, and the other end is connected to the limiting ball, and the limiting ball can abut against the limiting hole.

[0020] Beneficial effect: The spring, the limiting ball and the limiting hole cooperate to limit the handle after the handle is rotated, that is, the second limiting axis after the handle is rotated is limited by the handle.

[0021] As a preferred embodiment of the present invention, a plurality of gear indicator signs are provided on a side of the fixed plate away from the limiting plate, and the plurality of gear indicator signs correspond to the limiting holes respectively.

[0022] As a preferred embodiment of the present utility model, the handle includes a first rotating part and a second rotating part vertically connected to the first rotating part, and the first rotating part is connected to the second limiting shaft.

[0023] As a preferred embodiment of the present invention, the root circle diameters of the first gear, the second gear, the third gear and the fourth gear increase successively, and the root circle diameters of the first driven gear, the second driven gear, the third driven gear and the fourth driven gear decrease successively. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a part of a transmission box of the utility model applied to a micro-tillage machine;

[0025] Figure 2 It is a structural schematic diagram of a part of the transmission box of the utility model applied to a micro-tillage machine from another angle;

[0026] Figure 3 This is a partial structural diagram of the transmission box of the utility model applied to a micro-tillage machine at another angle;

[0027] Figure 4 The utility model is a partial structural diagram of a transmission box shifting mechanism applied to a micro-tillage machine. DETAILED DESCRIPTION

[0028] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0029] In the description of the present application, the terms "first", "second", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] The accompanying drawings include: driving shaft 1, first gear 1-1, second gear 1-2, third gear 1-3, fourth gear 1-4, driven shaft 2, first driven gear 2-1, second driven gear 2-2, third driven gear 2-3, fourth driven gear 2-4, secondary shaft 3, reversing gear 3-1, shift wheel 4, second annular groove 4-1, limiting groove 4-2, first clamping groove 5, clamping column 6, first limiting shaft 7-1, second limiting shaft 7-2, connecting member 7-3, arc portion 7-31, first connecting portion 7-32, second connecting portion 7-33, ball 7-4, first annular groove 7-5, handle 7-6, first rotating portion 7-61, second rotating portion 7-62, fixed plate 7-7, limiting hole 7-71, limiting plate 7-8, spring 7-81, limiting ball 7-82, gear indicator plate 7-9.

[0032] like Figure 1-4 As shown, the transmission box used for micro-tillage machine, such as Figure 1 As shown, it includes a housing, a driving shaft 1, a driven shaft 2, and a secondary shaft 3. The driving shaft 1, the driven shaft 2, and the secondary shaft 3 are all parallel to each other in different planes. The driving shaft 1, the driven shaft 2, and the secondary shaft 3 are all installed on the housing through bearings.

[0033] like Figure 1 As shown, the driving shaft 1 is provided with a first gear 1-1, a second gear 1-2, a third gear 1-3, and a fourth gear 1-4 in an idle sleeve in sequence, and the driving shaft 1 is fixedly connected with two shift wheels 4 respectively located between the first gear 1-1 and the second gear 1-2, the third gear 1-3 and the fourth gear 1-4. In this embodiment, the shift wheel 4 is spline-connected to the driving shaft 1, as shown in FIG. Figure 2 As shown, the first gear 1-1, the second gear 1-2, the third gear 1-3, and the fourth gear 1-4 are all circumferentially spaced apart with a plurality of first slots 5, and both end surfaces of the shift wheel 4 are circumferentially spaced apart with a plurality of clamping columns 6 that can be clamped into the first slots 5, as shown in FIG. Figure 4 As shown, the shift wheel 4 is provided with a second annular groove 4-1, and a limiting groove 4-2 is provided on an opposite side wall of the second annular groove 4-1. The two shift wheels 4 are provided with a shift mechanism for driving the corresponding shift wheel 4 to slide along the axial direction of the driving shaft 1 and connect with the corresponding gear.

[0034] like Figure 1 As shown, the shift mechanism includes a first limit shaft 7-1 and a second limit shaft 7-2 which are eccentrically parallel, two connecting components and a limit component for controlling the rotation and limiting of the second limit shaft 7-2. The first limit shaft 7-1 is fixedly connected to the housing, and the second limit shaft 7-2 is installed on the housing through a bearing. The second limit shaft 7-2 is provided with two multi-peak first annular grooves 7-5. In this embodiment, the two first annular grooves 7-5 both include a smooth portion and two wave peaks.

[0035] like Figure 4As shown, the connecting assembly includes a connecting member 7-3 and a ball 7-4. One end of the connecting member 7-3 can be rotatably connected to the shift wheel 4, and the other end can be slidably matched with the first limit shaft 7-1. The end of the connecting member 7-3 connected to the first limit shaft 7-1 is rotationally connected to the ball 7-4, and the ball 7-4 can slide on the corresponding first annular groove 7-5.

[0036] In this embodiment, the connecting member 7-3 includes an arc portion 7-31, a first connecting portion 7-32 and a second connecting portion 7-33. The arc portion 7-31, the first connecting portion 7-32 and the second connecting portion 7-33 are connected in sequence. The arc portion 7-31 slides with the bottom of the second annular groove 4-1, and the two ends of the arc portion 7-31 extend into the corresponding limiting groove 4-2 respectively. The second connecting portion 7-33 slides with the first limiting shaft 7-1, and the second connecting portion 7-33 is rotationally connected to the ball 7-4. In this embodiment, the second connecting portion 7-33 is cylindrical.

[0037] like Figure 1 As shown, the limit assembly includes a handle 7-6 for controlling the rotation of the second limit shaft 7-2, and a limit member for limiting the handle 7-6 after rotation. The handle 7-6 is connected to the second limit shaft 7-2, and the handle 7-6 is coaxial with the second limit shaft 7-2. Figure 3 As shown, the handle 7-6 includes a first rotating part 7-61 and a second rotating part 7-62 vertically connected to the first rotating part 7-61, and the first rotating part 7-61 is connected to the second limiting shaft 7-2.

[0038] like Figure 1 As shown, the limiting member includes a fixed plate 7-7 fixedly connected to the box body, and a limiting plate 7-8 fixedly connected to the handle 7-6. The fixed plate 7-7, the limiting plate 7-8, and the handle 7-6 are coaxial. One end of the handle 7-6 passes through the fixed plate 7-7 and is rotatably connected to the fixed plate 7-7. In this embodiment, the second rotating portion 7-62 is located on the outside of the fixed plate 7-7, and a plurality of limiting holes 7-71 are circumferentially spaced on one side of the fixed plate 7-7 opposite to the limiting plate 7-8. In this embodiment, a total of five limiting holes 7-71 are provided, and the limiting plate 7-8 is provided with Spring 7-81 and limiting ball 7-82, one end of spring 7-81 is connected to limiting plate 7-8, and the other end is connected to limiting ball 7-82, limiting ball 7-82 can abut against limiting hole 7-71, a side of fixed plate 7-7 away from limiting plate 7-8 is circumferentially spaced with a plurality of gear indicator signs 7-9, and the plurality of gear indicator signs 7-9 respectively correspond to the limiting holes 7-71. In this embodiment, there are a total of five gear indicator signs 7-9, and the five gear indicator signs 7-9 respectively represent reverse gear R, neutral gear N, first gear 1, second gear 2, and third gear 3 in clockwise order.

[0039] In this embodiment, the second rotating portion 7-62 is directly opposite to the corresponding limiting hole 7-71 abutting against the limiting ball 7-82.

[0040] The first driven gear 2-1, the second driven gear 2-2, the third driven gear 2-3 and the fourth driven gear 2-4 are fixedly connected to the driven shaft 2 in sequence. In this embodiment, the first driven gear 2-1, the second driven gear 2-2, the third driven gear 2-3 and the fourth driven gear 2-4 are all spline-connected to the driven shaft 2, and a reversing gear 3-1 is arranged on the idle sleeve of the secondary shaft 3.

[0041] The reversing gear 3-1 is constantly meshed with the first gear 1-1 and the first driven gear 2-1, the second gear 1-2 is constantly meshed with the second driven gear 2-2, the third gear 1-3 is constantly meshed with the third driven gear 2-3, and the fourth gear 1-4 is constantly meshed with the fourth driven gear 2-4.

[0042] In this embodiment, the root circle diameters of the first gear 1-1, the second gear 1-2, the third gear 1-3, and the fourth gear 1-4 increase successively, and the root circle diameters of the first driven gear 2-1, the second driven gear 2-2, the third driven gear 2-3, and the fourth driven gear 2-4 decrease successively.

[0043] One of the balls 7-4 is located at one of the wave crests of the corresponding first annular groove 7-5, the shift wheel 4 is connected to the first gear 1-1, the shift wheel 4, the first gear 1-1, the reversing gear 3-1, and the first driven gear 2-1 cooperate to realize the reverse gear output; the ball 7-4 is located at the other wave crest of the corresponding first annular groove 7-5, the shift wheel 4 is connected to the second gear 1-2, the shift wheel 4, the second gear 1-2, and the second driven gear 2-2 cooperate to realize the first gear output; the other ball 7-4 is located at one of the wave crests of the corresponding first annular groove 7-5, the shift wheel 4 is connected to the third gear 1-3, the shift wheel 4, the third gear 1-3, and the third driven gear 2-3 cooperate to realize the second gear output; the other ball 7-4 is located at the other wave crest of the corresponding first annular groove 7-5, the shift wheel 4 is connected to the fourth gear 1-4, the shift wheel 4, the fourth gear 1-4, and the fourth driven gear 2-4 cooperate to realize the third gear output.

[0044] Gear operation instructions: The second rotating part 7-62 is facing the gear indicator plate 7-9 of the reverse gear R, and the two balls 7-4 are located at the smooth part of the first annular groove 7-5. When shifting to the first gear, hold the second rotating part 7-62 and drive the second rotating part 7-62 to rotate clockwise. The limiting plate 7-8 rotates clockwise with the second rotating part 7-62. The limiting plate 7-8 drives the limiting ball 7-82 to slide from the limiting hole 7-71 corresponding to the reverse gear R to the limiting hole 7-71 corresponding to the first gear through the spring 7-81. At the same time, the second rotating part 7-62 drives the second limiting shaft 7- 2 rotates, the ball 7-4 close to the limiting plate 7-8 slides on the corresponding first annular groove 7-5 on the second limiting shaft 7-2 and is located at the wave crest, the ball 7-4 drives the connecting member 7-3 to slide axially along the driving shaft 1, the connecting member 7-3 drives the shift wheel 4 to slide axially along the driving shaft 1, the clamping column 6 on the shift wheel 4 is clamped into the first clamping groove 5 on the second gear 1-2, the shift wheel 4 is connected to the second gear 1-2, the shift wheel 4 drives the second gear 1-2 to rotate with the driving shaft 1, the second gear 1-2 drives the second driven gear 2-2 to rotate, and the second driven gear 2-2 drives the driven shaft 2 to rotate and output;

[0045] When shifting to the second gear, hold the second rotating part 7-62 with your hand and drive the second rotating part 7-62 to rotate clockwise, the limit plate 7-8 follows the second rotating part 7-62 to rotate clockwise, the limit plate 7-8 drives the limit ball 7-82 to slide from the limit hole 7-71 corresponding to the first gear to the limit hole 7-71 corresponding to the second gear through the spring 7-81, and at the same time, the second rotating part 7-62 drives the second limit shaft 7-2 to rotate through the first rotating part 7-61, and the ball 7-4 close to the limit plate 7-8 slides on the first annular groove 7-5 corresponding to the second limit shaft 7-2, and is located in a smooth place, located between the first gear 1-1 and the second gear 1-2. The shift wheel 4 is away from the second gear 1-2, and the ball 7-4 away from the limit plate 7-8 slides on the corresponding first annular groove 7-5 on the second limit shaft 7-2 and is located at the crest. The ball 7-4 drives the connecting member 7-3 to slide axially along the driving shaft 1, and the connecting member 7-3 drives the shift wheel 4 to slide axially along the driving shaft 1. The clamping column 6 on the shift wheel 4 is clamped into the first clamping groove 5 on the third gear 1-3. The shift wheel 4 is connected to the third gear 1-3. The shift wheel 4 drives the third gear 1-3 to rotate with the driving shaft 1, and the third gear 1-3 drives the third driven gear 2-3 to rotate, and the third driven gear 2-3 drives the driven shaft 2 to rotate and output.

[0046] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A transmission box for a micro-tillage machine, comprising a driving shaft, a driven shaft, and a secondary shaft, wherein the driving shaft, the driven shaft, and the secondary shaft are all parallel to each other in different planes, and characterized in that: The driving shaft is provided with a first gear, a second gear, a third gear, and a fourth gear in an idle sleeve in sequence, the driven shaft is fixedly connected with a first driven gear, a second driven gear, a third driven gear, and a fourth driven gear in sequence, and the counter shaft is provided with a reversing gear in an idle sleeve; The reversing gear is constantly meshed with the first gear and the first driven gear respectively, the second gear is constantly meshed with the second driven gear, the third gear is constantly meshed with the third driven gear, and the fourth gear is constantly meshed with the fourth driven gear; The driving shaft is fixedly connected with two shift wheels respectively located between the first gear and the second gear, and between the third gear and the fourth gear, and the two shift wheels are provided with a shift mechanism for driving the corresponding shift wheel to slide along the axial direction of the driving shaft and connected with the corresponding gear; The shift wheel is connected to the first gear, and the shift wheel, the first gear, the reversing gear, and the first driven gear are used together to achieve reverse gear output; the shift wheel is connected to the second gear, and the shift wheel, the second gear, and the second driven gear are used together to achieve first gear output; the shift wheel is connected to the third gear, and the shift wheel, the third gear, and the third driven gear are used together to achieve second gear output; the shift wheel is connected to the fourth gear, and the shift wheel, the fourth gear, and the fourth driven gear are used together to achieve third gear output.

2. The transmission box for a micro-tillage machine according to claim 1, characterized in that: The first gear, the second gear, the third gear and the fourth gear are all provided with a plurality of first slots at intervals in the circumferential direction, and both end surfaces of the shift wheel are provided with a plurality of clamping columns which can be clamped into the first slots at intervals in the circumferential direction.

3. The transmission box for a micro-tillage machine according to claim 1, characterized in that: It also includes a box body, wherein the shift mechanism includes a first limit shaft and a second limit shaft that are parallel to each other in different planes, two connecting components, and a limit component for controlling the rotation and limit of the second limit shaft; The first limit shaft is fixedly connected to the box body, the connecting assembly includes a connecting piece and a ball, one end of the connecting piece can be rotatably connected to the shift wheel, and the other end is slidably matched with the first limit shaft, and the end of the connecting piece connected to the first limit shaft is rotatably connected to the ball; The second limiting shaft is installed on the box body through a bearing. The second limiting shaft is provided with two multi-peak first annular grooves, and the balls can slide on the corresponding first annular grooves.

4. The transmission box for a micro-tillage machine according to claim 3 is characterized in that: The shift wheel is provided with a second annular groove, and a limiting groove is provided on an opposite side wall of the second annular groove. The connecting member includes an arc portion, a first connecting portion and a second connecting portion. The arc portion, the first connecting portion and the second connecting portion are connected in sequence. The arc portion is slidably matched with the bottom of the second annular groove, and the two ends of the arc portion are respectively extended into the corresponding limiting grooves, the second connecting portion is slidably matched with the first limiting shaft, and the second connecting portion is rotationally connected to the ball.

5. The transmission box for a micro-tillage machine according to claim 3, characterized in that: The limiting assembly includes a handle for controlling the rotation of the second limiting shaft and a limiting member for limiting the handle after rotation. The handle is connected to the second limiting shaft, and the handle and the second limiting shaft are coaxial.

6. The transmission box for a micro-tillage machine according to claim 5, characterized in that: The limiting component includes a fixed plate fixedly connected to the box body and a limiting plate fixedly connected to the handle. The fixed plate, the limiting plate and the handle are coaxial. One end of the handle passes through the fixed plate and is rotatably connected to the fixed plate. A plurality of limiting holes are provided on a side of the fixed plate opposite to the limiting plate. The limiting plate is provided with a spring and a limiting ball. One end of the spring is connected to the limiting plate, and the other end is connected to the limiting ball. The limiting ball can abut against the limiting hole.

7. The transmission box for a micro-tillage machine according to claim 6, characterized in that: A plurality of gear indicator plates are arranged on a side of the fixed plate away from the limiting plate, and the plurality of gear indicator plates correspond to the limiting holes respectively.

8. The transmission box for a micro-tillage machine according to claim 5, characterized in that: The handle comprises a first rotating part and a second rotating part vertically connected to the first rotating part, and the first rotating part is connected to the second limiting shaft.

9. The transmission box for a micro-tillage machine according to claim 1, characterized in that: The tooth root circle diameters of the first gear, the second gear, the third gear and the fourth gear increase in sequence, and the tooth root circle diameters of the first driven gear, the second driven gear, the third driven gear and the fourth driven gear decrease in sequence.

Images