Gearbox of mini-tiller

Abstract

The utility model relates to the technical field of mini-tiller gearboxes, and discloses a mini-tiller gearbox 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, the driving shaft is fixedly connected with a first duplicate gear and a second duplicate gear, the first duplicate gear comprises a first gear and a second gear, and the second gear comprises a second gear and a third gear. The second duplicate gear comprises a third gear and a fourth gear, the first duplicate gear is provided with a first shifting fork assembly used for driving the first duplicate gear to slide in the axial direction of the driving shaft and limiting the first duplicate gear, and the second duplicate gear is provided with a second shifting fork assembly used for driving the second duplicate gear to slide in the axial direction of the driving shaft and limiting the second duplicate gear. The driven shaft is sequentially and fixedly connected with a first driven gear, a second driven gear, a third driven gear and a fourth driven gear, the auxiliary shaft is sleeved with a reversing gear in an empty mode, and the reversing gear is constantly meshed with the second driven gear. According to the gearbox, gear shifting operation can be stably completed, impact on internal parts of the gearbox is reduced, and the service life of the gearbox can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of micro-tiller gearboxes, and particularly relates to a micro-tiller gearbox. Background Art

[0002] Currently, when operating a micro-tiller to shift gears, it is usually from neutral to the first gear, then directly from the first gear to the second gear, and then directly from the second gear to the third gear, that is, direct gear shifting. If the clutch fails to separate in time during gear shifting and the throttle is adjusted improperly at the same time, direct gear shifting is likely to cause the engine speed to not match the speed of the output shaft of the gearbox, resulting in a speed difference between the gears about to mesh, causing an impact between the gears about to mesh, thereby causing an impact on components such as gears and bearings inside the gearbox and reducing the service life of the gearbox. Summary of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a micro-tiller gearbox, which can smoothly complete gear shifting operations, reduce the impact on internal components of the gearbox, and extend the service life of the gearbox.

[0004] The technical solution adopted by the utility model is as follows: A micro-tiller gearbox includes a main shaft, a driven shaft, and a countershaft. The main shaft, the driven shaft, and the countershaft are all parallel in different planes. The main shaft is fixedly connected with a first double gear and a second double gear. The first double gear includes a first gear and a second gear. The second double gear includes a third gear and a fourth gear. The first double gear is provided with a first fork assembly for driving the first double gear to slide axially along the main shaft and for limiting its position. The second double gear is provided with a second fork assembly for driving the second double gear to slide axially along the main shaft and for limiting its position. The driven shaft is successively fixedly connected with a first driven gear, a second driven gear, a third driven gear, and a fourth driven gear. A reversing gear is sleeved on the countershaft in an idle manner, and the reversing gear is constantly meshed with the second driven gear;

[0005] The first fork assembly includes a first limiting shaft, a first connecting piece connected to the first double gear, and a first limiting piece. The first limiting shaft is axially provided with a plurality of first annular grooves at intervals along the first limiting shaft. The first connecting piece is sleeved on the first limiting shaft, and one end of the first limiting piece is connected to the first connecting piece, and the other end is located in one of the first annular grooves;

[0006] The second fork assembly includes a second limiting shaft, a second connecting piece connected to the second double gear, and a second limiting piece. The second limiting shaft is axially provided with a plurality of second annular grooves at intervals along the second limiting shaft. The second connecting piece is sleeved on the second limiting shaft, and one end of the second limiting piece is connected to the second connecting piece, and the other end is located in one of the second annular grooves;

[0007] The first gear and the first driven gear cooperate to achieve first-gear output. The second gear, the reversing gear, and the second driven gear cooperate to achieve reverse-gear output. The third gear and the third driven gear cooperate to achieve second-gear output. The fourth gear and the fourth driven gear cooperate to achieve third-gear output.

[0008] Principle of the technical solution:

[0009] The first connecting piece drives the first double gear to slide forward along the axial direction of the driving shaft, and the first limiting piece moves. The first limiting piece moves from the corresponding first annular groove to an adjacent first annular groove. The first limiting piece limits the first connecting piece, and limits the first double gear through the first connecting piece. The first gear meshes with the first driven gear to achieve first-gear output.

[0010] The first connecting piece drives the first double gear and the first limiting piece to slide backward along the axial direction of the driving shaft. The first gear moves away from the first driven gear. The first limiting piece returns from the adjacent first annular groove to the initial corresponding first annular groove to achieve neutral output. The first limiting piece limits the first connecting piece, and limits the first double gear through the first connecting piece. The first connecting piece continues to drive the first double gear to slide backward along the axial direction of the driving shaft, and the first limiting piece moves. The second gear meshes with the reversing gear. The first limiting piece moves from the corresponding first annular groove to another adjacent first annular groove. The first limiting piece limits the first connecting piece, and limits the first double gear through the first connecting piece. The second gear, the reversing gear, and the second driven gear cooperate to achieve reverse-gear output.

[0011] The second connecting piece drives the second double gear to slide forward along the axial direction of the driving shaft, and the second limiting piece moves. The second limiting piece moves from the corresponding second annular groove to an adjacent second annular groove. The second limiting piece limits the second connecting piece, and limits the second double gear through the second connecting piece. The third gear meshes with the third driven gear to achieve second-gear output.

[0012] The second connecting piece drives the second double gear to slide backward along the axial direction of the driving shaft, and the second limiting piece moves. The third gear moves away from the third driven gear. The second limiting piece returns from the adjacent second annular groove to the initial corresponding second annular groove to achieve neutral output. The second limiting piece limits the second connecting piece, and limits the second double gear through the second connecting piece. The second connecting piece continues to drive the second double gear to slide backward along the axial direction of the driving shaft, and the second limiting piece moves. The second limiting piece moves from the corresponding second annular groove to another adjacent second annular groove. The second limiting piece limits the second connecting piece, and limits the second double gear through the second connecting piece. The fourth gear meshes with the fourth driven gear to achieve third-gear output.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] Through the first connecting piece and the first limiting piece, the present utility model can drive the first double gear to slide and be limited. Through the second connecting piece and the second limiting piece, the second double gear can be driven to slide and be limited. The cooperation of the first double gear, the second double gear, the first driven gear, the second driven gear, the third driven gear, the fourth driven gear, the first fork assembly and the second fork assembly can achieve neutral gear transition shifting during gear shifting, that is, from neutral gear to first gear, from first gear to neutral gear to reverse gear, from first gear to neutral gear to second gear, from second gear to neutral gear to third gear. When in the neutral gear state, the power transmission between the engine and the gearbox is cut off, which gives the driver the opportunity to adjust the engine speed to make it closer to the speed required for the gear to be engaged. When shifting into a new gear again, since the engine speed is already relatively matched, the impact generated when the gears inside the gearbox are engaged will be greatly reduced, so that the gear shifting operation can be completed smoothly, reducing the impact on the internal components of the gearbox and extending the service life of the gearbox.

[0015] As a preferred embodiment of the present utility model, the first connecting piece includes a first connecting cylinder, a first connecting block and a first dial. The first connecting cylinder is sleeved on the first limiting shaft. One end of the first dial is connected to the first connecting cylinder, and the other end is connected to the first double gear. The first connecting block is connected to the outer surface of the first connecting cylinder. The first limiting piece includes a first hollow cylinder with one end penetrated, a first spring and a first limiting ball. The penetrated end of the first hollow cylinder is communicated with the first connecting cylinder. The first limiting ball is located in the corresponding first annular groove. One end of the first spring is connected to the first limiting ball, and the other end is connected to the inner surface of the bottom of the first hollow cylinder.

[0016] In this solution, the first connecting cylinder slides axially along the first limiting shaft. Since the first connecting cylinder is connected to the first hollow cylinder, and the first limiting ball is connected to the first hollow cylinder through the first spring, the first connecting cylinder drives the first hollow cylinder to move axially along the first limiting shaft. The first hollow cylinder drives the first limiting ball to move from the corresponding first annular groove to the adjacent first annular groove through the first spring. The cooperation of the first limiting ball and the first annular groove limits the first connecting cylinder.

[0017] As a preferred embodiment of the present utility model, the second connecting piece includes a second connecting cylinder, a second connecting block and a second dial. The second connecting cylinder is sleeved on the second limiting shaft. One end of the second dial is connected to the second connecting cylinder, and the other end is connected to the second double gear. The second connecting block is connected to the outer surface of the second connecting cylinder. The second limiting piece includes a second hollow cylinder with one end penetrated, a second spring and a second limiting ball. The penetrated end of the second hollow cylinder is communicated with the second connecting cylinder. The second limiting ball is located in the corresponding second annular groove. One end of the second spring is connected to the second limiting ball, and the other end is connected to the inner surface of the bottom of the second hollow cylinder.

[0018] In this solution, the second connecting tube slides axially along the second limiting axis. Since the second connecting tube is connected to the second hollow cylinder, the second limiting ball is connected to the second hollow cylinder through the second spring. The second connecting tube drives the second hollow cylinder to move axially along the second limiting axis. The second hollow cylinder drives the second limiting ball from the corresponding second annular groove to the adjacent second annular groove through the second spring. The second limiting ball and the second annular groove cooperate to limit the second connecting tube.

[0019] As a preferred embodiment of the utility model, it also includes a shifting mechanism for shifting the first connecting member to move axially along the first limiting axis or the second connecting member to move axially along the second limiting axis, the shifting mechanism includes a shell, a shifting lever, a first control member, and a second control member, one end of the shifting lever is located outside the shell, and the other end can extend into the first control member or the second control member, the middle part of the shifting lever is rotatably connected to the shell, the first control member can be fitted with the second control member, the first control member and the second control member are both rotatably connected to the shell, the first control member is located between the second control member and the shell, limiting wings are symmetrically provided on both sides of the first control member, and a stop block is provided at the end of the limiting wing, the stop block can abut against the side of the second control member, the first control member is connected to the first connecting member, and the second control member is connected to the second connecting member.

[0020] In this scheme, in the initial state, the first control member and the second control member are fitted, the gearbox is in a neutral output state, the shift lever is in the middle position, the shift lever rotates to the left relative to the housing and extends into the first control member, the second control member remains stationary, the shift lever is held and driven forward, the shift lever controls the vertical plane of the first control member to rotate counterclockwise, the stopper on one of the limiting wings on the first control member abuts against the side of the second control member, the first control member controls the first connecting member to slide forward along the axial direction of the first limiting axis, and the first connecting member drives the first double gear to slide along the driving shaft Slide forward to realize first gear output, hold the shift lever and drive the shift lever backward, the shift lever controls the first control member to return to the initial position to realize neutral gear output, hold the shift lever and drive the shift lever backward, the shift lever controls the vertical plane of the first control member to rotate clockwise, the block on the other limiting wing on the first control member abuts against the side of the second control member, the first control member controls the first connecting member to slide backward along the axial direction of the first limiting shaft, the first connecting member drives the first double gear to slide backward along the axial direction of the driving shaft to realize reverse gear output, and the shift lever controls the first control member to return to the initial position to realize neutral gear output;

[0021] The shift lever rotates relative to the housing to the right and extends into the second control member. The first control member remains stationary. Hold the shift lever and drive it backward. The shift lever controls the second control member to rotate clockwise in the vertical plane. The side of the second control member abuts against the stopper on one of the limiting wings on the first control member. The second control member controls the second connecting member to slide forward axially along the second limiting shaft. The second connecting member drives the second double gear to slide forward axially along the driving shaft to achieve second-gear output. Hold the shift lever and drive it forward. The shift lever controls the second control member to return to the initial position to achieve neutral output. Hold the shift lever and drive it forward. The shift lever controls the second control member to rotate counterclockwise in the vertical plane. The side of the second control member abuts against the stopper on the other limiting wing on the first control member. The second control member controls the second connecting member to slide backward axially along the second limiting shaft. The second connecting member drives the second double gear to slide backward axially along the driving shaft to achieve third-gear output. The shift lever controls the second control member to return to the initial position to achieve neutral output.

[0022] As a preferred embodiment of the present utility model, the first control member includes a first connecting portion rotatably connected to the housing, a first clamping portion clamped to the first connecting member in the gearbox housing, and a first cavity for accommodating the end of the shift lever. The first clamping portion and the first cavity are respectively connected to the first connecting portion, and the first clamping portion and the first cavity are perpendicular to each other. The limiting wings are respectively located on both sides of the connection between the first connecting portion and the first cavity.

[0023] As a preferred embodiment of the present utility model, the second control member includes a second connecting portion rotatably connected to the housing, a second clamping portion clamped to the second connecting member in the gearbox housing, and a second cavity for accommodating the end of the shift lever. The second clamping portion and the second cavity are respectively connected to the first connecting portion, and the second clamping portion and the second cavity are perpendicular to each other. The stopper can abut against the side of the second connecting portion.

[0024] As a preferred embodiment of the present utility model, the first connecting portion is attached to the second connecting portion. The first connecting portion is provided with a first connecting hole, and the second connecting portion is provided with a second connecting hole that coincides with the first connecting hole. The second connecting portion and the first connecting portion are rotatably connected to the housing through the first connecting hole and the second connecting hole. The first connecting portion can rotate relative to the second connecting portion and the housing, and the second connecting portion can rotate relative to the first connecting portion and the housing. When the first cavity and the second cavity are attached, the centers of the first clamping portion, the second clamping portion, and the first connecting portion are collinear. The shift lever is located between the first cavity and the second cavity. The lower end of the second cavity faces the first cavity, and the upper end of the second cavity is located above the first cavity.

[0025] Beneficial effects: Since the shift lever rotates, the upper end of the second cavity being located above the first cavity can ensure that the shift lever is accurately located in the first cavity or the second cavity after rotation.

[0026] As a preferred embodiment of the present utility model, it further includes a third limiting member for limiting the second control member. The first control member is close to the inner wall of the housing, the first control member can be attached to the second control member, the second control member is located outside the first control member, the third limiting member is located outside the second control member and abuts and limits the outer surface of the second control member, and the third limiting member is fixedly connected to the housing.

[0027] Beneficial effects: The third limiting member can limit the second control member to ensure that the outer surface of the second control member is abutted. When the shift lever controls the second control member to rotate, the second control member will not be pushed to move to the left with the rotation connection point between the second control member and the housing as the fulcrum, preventing the second control member from being easily fatigued and broken due to being controlled to rotate.

[0028] As a preferred embodiment of the present utility model, a first sphere is provided in the middle of the shift lever, the housing is provided with a through hole, and the shift lever is rotationally connected to the housing through the first sphere and the through hole.

[0029] As a preferred embodiment of the present utility model, a second sphere is provided at one end of the shift lever that can extend into the first control member.

[0030] Beneficial effects: Compared with the design that one end of the shift lever is a cylinder, the second sphere can increase the contact area between the shift lever and the first control member or the second control member, and can ensure that the shift lever can smoothly rotate from the first control member to the second control member. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of a part of the micro-tiller gearbox of the present utility model;

[0032] Figure 2 is a schematic structural diagram of another angle of a part of the micro-tiller gearbox of the present utility model;

[0033] Figure 3 is a schematic structural diagram of another angle of a part of the micro-tiller gearbox of the present utility model;

[0034] Figure 4 is a schematic structural diagram of another angle of a part of the micro-tiller gearbox of the present utility model;

[0035] Figure 5 is a schematic structural diagram of the shift mechanism of the micro-tiller gearbox of the present utility model;

[0036] Figure 6 is a schematic structural diagram of another angle of the shift mechanism of the micro-tiller gearbox of the present utility model;

[0037] Figure 7 is a schematic structural diagram of another angle of the shift mechanism of the micro-tiller gearbox of the present utility model;

[0038] Figure 8 is a schematic structural view of a partial gear shifting mechanism of the gearbox of the micro-tiller of the present utility model;

[0039] Figure 9 is a schematic structural view of another partial angle of the gear shifting mechanism of the gearbox of the micro-tiller of the present utility model;

[0040] Figure 10 is a schematic structural view of yet another partial angle of the gear shifting mechanism of the gearbox of the micro-tiller of the present utility model. Detailed implementation manners

[0041] Typical implementation manners reflecting the features and advantages of the present utility model will be specifically described in the following description. It should be understood that the present utility model can have various changes in different implementation manners, all of which do not depart from the scope of the present utility model, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present utility model.

[0042] In the description of the present application, the orientation or positional relationship indicated by terms such as "first", "second", "one side", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0043] The present utility model will be described in detail below with reference to the drawings and in conjunction with the implementation manners.

[0044] Reference numerals include: driving shaft 1, first double gear 1-1, first gear 1-11, second gear 1-12, second double gear 1-2, third gear 1-21, fourth gear 1-22, driven shaft 2, first driven gear 2-1, second driven gear 2-2, third driven gear 2-3, fourth driven gear 2-4, auxiliary shaft 3, reversing gear 3-1, first limiting shaft 4-1, first annular groove 4-11, first connecting member 4-2, first connecting cylinder 4-21, first connecting block 4-22, first dial 4-23, first limiting member 4-3, second limiting shaft 5-1, second annular groove 5-11, second connecting member 5-2, second connecting cylinder 5-21, second connecting block 5-22, second dial 5-23, second limiting member 5-3, second hollow cylinder 5-31, second spring 5-32, second limiting ball 5-33, housing 6, shifting lever 7, first sphere 7-1, second sphere 7-2, first control member 8, first connecting portion 8-1, first clamping portion 8-2, first cavity 8-3, second control member 9, second connecting portion 9-1, second clamping portion 9-2, second cavity 9-3, limiting wing 10, stop block 11, third limiting member 12.

[0045] AsFigure 1-10 As shown in Figure 1 shown, the micro-tiller gearbox includes a housing, a driving shaft 1, a driven shaft 2, a countershaft 3, and a shifting mechanism for moving the first connecting member 4-2 axially along the first limiting shaft 4-1 or the second connecting member 5-2 axially along the second limiting shaft 5-1. The driving shaft 1, the driven shaft 2, and the countershaft 3 are all skew-parallel to each other, and the driving shaft 1, the driven shaft 2, and the countershaft 3 are all installed on the housing through bearings.

[0046] As Figure 1 shown, the driving shaft 1 is fixedly connected with a first double gear 1-1 and a second double gear 1-2. In this embodiment, the driving shaft 1 is spline-connected with the first double gear 1-1 and the second double gear 1-2. The first double gear 1-1 includes a first gear 1-11 and a second gear 1-12, and the second double gear 1-2 includes a third gear 1-21 and a fourth gear 1-22. The first double gear 1-1 is provided with a first fork assembly for driving the first double gear 1-1 to slide axially along the driving shaft 1 and being limited, and the second double gear 1-2 is provided with a second fork assembly for driving the second double gear 1-2 to slide axially along the driving shaft 1 and being limited.

[0047] As Figure 4 shown, the first fork assembly includes a first limiting shaft 4-1, a first connecting member 4-2 connected to the first double gear 1-1, and a first limiting member 4-3. The first limiting shaft 4-1 is axially provided with a plurality of first annular grooves 4-11 at intervals along the first limiting shaft 4-1. The first connecting member 4-2 is sleeved on the first limiting shaft 4-1. One end of the first limiting member 4-3 is connected to the first connecting member 4-2, and the other end is located in one of the first annular grooves 4-11.

[0048] In this embodiment, the first connecting member 4-2 includes a first connecting cylinder 4-21, a first connecting block 4-22, and a first dial 4-23. The first connecting cylinder 4-21 is sleeved on the first limiting shaft 4-1. One end of the first dial 4-23 is connected to the first connecting cylinder 4-21, and the other end is connected to the first double gear 1-1. The first connecting block 4-22 is connected to the outer surface of the first connecting cylinder 4-21. The first limiting member 4-3 includes a first hollow cylinder with one end penetrated, a first spring, and a first limiting ball. The penetrated end of the first hollow cylinder communicates with the first connecting cylinder 4-21. The first limiting ball is located in the corresponding first annular groove 4-11. One end of the first spring is connected to the first limiting ball, and the other end is connected to the inner surface of the bottom of the first hollow cylinder.

[0049] As Figure 4As shown, the second fork assembly includes a second limiting shaft 5-1, a second connecting member 5-2 connected to the second double gear 1-2, and a second limiting member 5-3. The second limiting shaft 5-1 is axially provided with a plurality of second annular grooves 5-11 at intervals along the axis of the second limiting shaft 5-1. The second connecting member 5-2 is sleeved on the second limiting shaft 5-1. One end of the second limiting member 5-3 is connected to the second connecting member 5-2, and the other end is located in one of the second annular grooves 5-11.

[0050] In this embodiment, the second connecting member 5-2 includes a second connecting cylinder 5-21, a second connecting block 5-22, and a second dial 5-23. The second connecting cylinder 5-21 is sleeved on the second limiting shaft 5-1. One end of the second dial 5-23 is connected to the second connecting cylinder 5-21, and the other end is connected to the second double gear 1-2. The second connecting block 5-22 is connected to the outer surface of the second connecting cylinder 5-21. The second limiting member 5-3 includes a second hollow cylinder 5-31 with one end penetrated, a second spring 5-32, and a second limiting ball 5-33. The penetrated end of the second hollow cylinder 5-31 communicates with the second connecting cylinder 5-21. The second limiting ball 5-33 is located in the corresponding second annular groove 5-11. One end of the second spring 5-32 is connected to the second limiting ball 5-33, and the other end is connected to the inner surface of the bottom of the second hollow cylinder 5-31.

[0051] As Figure 5 、 6 As shown in FIGS. 8, the shifting mechanism includes a housing 6, a shift lever 7, a first control member 8, a second control member 9, and a third limiting member 12. The housing 6 is connected to the box body. The housing 6 is provided with a through hole. One end of the shift lever 7 away from the housing 1 is located outside the housing 6 and is provided with a third sphere. The other end can extend into the first control member 8 or the second control member 9. A first sphere 7-1 is provided in the middle of the shift lever 7 at the position of the through hole. The shift lever 7 is rotatably connected to the housing 6 through the first sphere 7-1 and the through hole. One end of the shift lever 7 that can extend into the first control member 8 is provided with a second sphere 7-2.

[0052] As Figure 8 As shown in FIG., the first control member 8 includes a first connecting portion 8-1 rotatably connected to the housing 6, a first clamping portion 8-2 clamped to the first connecting member 4-2 in the gearbox body, and a first cavity 8-3 for accommodating the second sphere 7-2. The first clamping portion 8-2 and the first cavity 8-3 are respectively connected to the first connecting portion 8-1, and the first clamping portion 8-2 and the first cavity 8-3 are perpendicular to each other. Limiting wings 10 are symmetrically provided on both sides of the connection between the first connecting portion 8-1 and the first cavity 8-3. Blocks 11 are provided at the ends of the limiting wings 10. The blocks 11 can abut against the side of the second control member 9.

[0053] In this embodiment, the first clamping portion 8-2 includes a first cylinder and a connecting column connected to the first cylinder. The first cylinder is clamped to the first connecting block 4-22, the connecting column is connected to the first connecting portion 8-1, the first cavity 8-3 includes a first square column, and a first accommodating groove with both ends penetrating is provided in the first square column. The second sphere 7-2 can be located in the first accommodating groove.

[0054] As Figure 8 shown, the second control member 9 includes a second connecting portion 9-1 rotatably connected to the housing 6, a second clamping portion 9-2 clamped to the second connecting member 5-2 in the gearbox housing, and a second cavity 9-3 for accommodating the second sphere 7-2. The second clamping portion 9-2 and the second cavity 9-3 are respectively connected to the second connecting portion 9-1, and the second clamping portion 9-2 and the second cavity 9-3 are perpendicular to each other. The stopper 11 can abut against the side of the second connecting portion 9-1. In this embodiment, the second clamping portion 9-2 is a second cylinder, the second cavity 9-3 includes a second square column, and a second accommodating groove with both ends penetrating is provided in the second square column. The second sphere 7-2 can be located in the second accommodating groove.

[0055] In this embodiment, the first control member 8 is close to the inner wall of the housing 6, the second connecting portion 9-1 is located outside the first connecting portion 8-1, the first connecting portion 8-1 and the second connecting portion 9-1 are attached and can coincide. A first connecting hole is provided on the first connecting portion 8-1, a second connecting hole is provided on the second connecting portion 9-1, the first connecting hole and the second connecting hole coincide, and the second connecting portion 9-1 and the first connecting portion 8-1 are rotatably connected to the housing 6 through the first connecting hole and the second connecting hole. The first connecting portion 8-1 can rotate relative to the second connecting portion 9-1 and the housing 6, and the second connecting portion 9-1 can rotate relative to the first connecting portion 8-1 and the housing 6. When the first cavity 8-3 and the second cavity 9-3 are attached, the centers of the first clamping portion 8-2, the second clamping portion 9-2, and the first connecting portion 8-1 are collinear. As Figure 7 shown, the first clamping portion 8-2 and the second clamping portion 9-2 are respectively located on both sides of the first connecting portion 8-1. As Figure 9 shown, the shift lever 7 is located between the first cavity 8-3 and the second cavity 9-3. The lower end of the second cavity 9-3 faces the first cavity 8-3, and the upper end of the second cavity 9-3 is located above the first cavity 8-3.

[0056] As Figure 10 shown, the third limiting member 12 is located outside the second control member 9 and abuts against and limits the outer surface of the second connecting portion 9-1. The third limiting member 12 includes a third connecting portion and fourth connecting portions symmetrically arranged on both sides of the end of the third connecting portion. The third connecting portion and the fourth connecting portions are connected. A third connecting hole is provided on the third connecting portion, the third connecting hole and the second connecting hole coincide, and the third limiting member 12 is fixedly connected to the housing 6 through the third connecting hole and the fourth connecting portions.

[0057] As Figure 2 , 3 shown, the driven shaft 2 is in spline connection with a first driven gear 2-1, a second driven gear 2-2, a third driven gear 2-3, and a fourth driven gear 2-4 in sequence. An idler gear 3-1 is sleeved on the auxiliary shaft 3, and the idler gear 3-1 is constantly meshed with the second driven gear 2-2.

[0058] The first gear 1-11 and the first driven gear 2-1 cooperate to achieve first gear output. The second gear 1-12, the idler gear 3-1, and the second driven gear 2-2 cooperate to achieve reverse gear output. The third gear 1-21 and the third driven gear 2-3 cooperate to achieve second gear output. The fourth gear 1-22 and the fourth driven gear 2-4 cooperate to achieve third gear output.

[0059] Shift operation instructions:

[0060] When the first connecting portion 8-1 and the second connecting portion 9-1 coincide, the first cavity 8-3 and the second cavity 9-3 are opposite to each other, and the shift lever 7 is in the neutral position, that is, Figure 5 at position N. When the shift lever 7 is turned to the left, the second sphere 7-2 is located in the first cavity 8-3, and the second control member 9 remains stationary. Hold the shift lever 7 and drive the shift lever 7 forward. The shift lever 7 controls the first control member 8 to rotate counterclockwise through the first cavity 8-3. The first connecting block 4-22 engaged with the first engaging portion 8-2 in the first control member 8 drives the first connecting cylinder 4-21 to slide axially forward along the first limiting shaft 4-1. The first connecting cylinder 4-21 drives the first double gear 1-1 to slide axially forward along the driving shaft 1 through the first dial 4-23, and also drives the first limiting member 4-3 to move. The first limiting ball in the first limiting member 4-3 moves from the corresponding first annular groove 4-11 to the adjacent first annular groove 4-11. The first limiting member 4-3 limits the first connecting cylinder 4-21, and the first connecting cylinder 4-21 limits the first double gear 1-1 through the first dial 4-23. The first gear 1-11 is engaged with the first driven gear 2-1 to achieve first gear output. The block 11 on one of the limiting wings 10 on the first control member 8 abuts against the second connecting portion 9-1;

[0061] Hold the shift lever 7 and drive the shift lever 7 backward to the initial position. The shift lever 7 controls the first control member 8 to rotate clockwise through the first cavity 8-3. The first connecting block 4-22 clamped with the first clamping portion 8-2 in the first control member 8 drives the first connecting cylinder 4-21 to slide axially backward along the first limiting shaft 4-1. The first connecting cylinder 4-21 drives the first double gear 1-1 to slide axially backward along the driving shaft 1 through the first dial 4-23. At the same time, it also drives the first limiting member 4-3 to move. The first limiting ball in the first limiting member 4-3 moves from the adjacent first annular groove 4-11 to the initially corresponding first annular groove 4-11. The first limiting member 4-3 limits the first connecting cylinder 4-21, and the first connecting cylinder 4-21 limits the first double gear 1-1 through the first dial 4-23. The first gear 1-11 moves away from the first driven gear 2-1, and the shift lever 7 is in the neutral position;

[0062] Hold the shift lever 7 and rotate it to the right. The second sphere 7-2 is located in the second cavity 9-3. The first control member 8 remains stationary. Hold the shift lever 7 and drive the shift lever 7 backward. The shift lever 7 controls the second control member 9 to rotate clockwise through the second cavity 9-3. The second connecting block 5-22 clamped with the second clamping portion 9-2 in the second control member 9 drives the second connecting cylinder 5-21 to slide axially forward along the second limiting shaft 5-1. The second connecting cylinder 5-21 drives the second double gear 1-2 to slide axially forward along the driving shaft 1 through the second dial 5-23. At the same time, it also drives the second limiting member 5-3 to move. The second limiting ball 5-33 in the second limiting member 5-3 moves from the corresponding annular groove 5-11 to the adjacent second annular groove 5-11. The second limiting member 5-3 limits the second connecting cylinder 5-21, and the second connecting cylinder 5-21 limits the second double gear 1-2 through the second dial 5-23. The third gear 1-21 meshes with the third driven gear 2-3 to realize the second gear output.

[0063] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A micro-tillage machine gearbox, comprising 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, and characterized in that: The driving shaft is fixedly connected with a first double gear and a second double gear, the first double gear includes a first gear and a second gear, the second double gear includes a third gear and a fourth gear, the first double gear is provided with a first fork assembly for driving the first double gear to slide axially along the driving shaft and limit the position, the second double gear is provided with a second fork assembly for driving the second double gear to slide axially along the driving shaft and limit the position, the driven shaft is sequentially fixedly connected with a first driven gear, a second driven gear, a third driven gear, and a fourth driven gear, the idler sleeve of the countershaft is provided with a reversing gear, and the reversing gear is constantly meshed with the second driven gear; The first shift fork assembly comprises a first limiting shaft, a first connecting member connected to the first double gear, and a first limiting member, the first limiting shaft is provided with a plurality of first annular grooves spaced apart along the axial direction of the first limiting shaft, the first connecting member is sleeved on the first limiting shaft, one end of the first limiting member is connected to the first connecting member, and the other end is located in one of the first annular grooves; The second shift fork assembly comprises a second limiting shaft, a second connecting member connected to the second double gear and a second limiting member, the second limiting shaft is provided with a plurality of second annular grooves spaced apart along the axial direction of the second limiting shaft, the second connecting member is sleeved on the second limiting shaft, one end of the second limiting member is connected to the second connecting member, and the other end is located in one of the second annular grooves; The first gear and the first driven gear are used together to achieve first gear output, the second gear, the reversing gear and the second driven gear are used together to achieve reverse gear output, the third gear and the third driven gear are used together to achieve second gear output, and the fourth gear and the fourth driven gear are used together to achieve third gear output.

2. The micro-tillage machine gearbox according to claim 1, characterized in that: The first connecting member includes a first connecting tube, a first connecting block, and a first dial. The first connecting tube is sleeved on the first limiting shaft. One end of the first dial is connected to the first connecting tube, and the other end is connected to the first double gear. The first connecting block is connected to the outer surface of the first connecting tube. The first limiting member includes a first hollow cylinder with one end passing through, a first spring and a first limiting ball. The through end of the first hollow cylinder is connected to the first connecting tube, and the first limiting ball is located in the corresponding first annular groove. One end of the first spring is connected to the first limiting ball, and the other end is connected to the inner surface of the bottom of the first hollow cylinder.

3. The micro-tillage machine gearbox according to claim 1, characterized in that: The second connecting member includes a second connecting cylinder, a second connecting block, and a second dial. The second connecting cylinder is sleeved on the second limiting shaft. One end of the second dial is connected to the second connecting cylinder, and the other end is connected to the second double gear. The second connecting block is connected to the outer surface of the second connecting cylinder. The second limiting member includes a second hollow cylinder with one end passing through, a second spring, and a second limiting ball. The through end of the second hollow cylinder is connected to the second connecting cylinder, and the second limiting ball is located in the corresponding second annular groove. One end of the second spring is connected to the second limiting ball, and the other end is connected to the inner surface of the bottom of the second hollow cylinder.

4. The micro-tillage machine gearbox according to claim 1, characterized in that: The camshaft is configured to move the first connecting member to a position adjacent to the second connecting member, wherein the first connecting member is configured to move the first connecting member to a position adjacent to the second connecting member, and the second connecting member is configured to move the first connecting member to a position adjacent to the second connecting member.

5. The micro-tillage machine gearbox according to claim 4, characterized in that: The first control member includes a first connecting portion rotatably connected to the shell, a first clamping portion clamped to the first connecting member in the gearbox case, and a first cavity for accommodating the end of the shift lever, the first clamping portion and the first cavity are respectively connected to the first connecting portion, and the first clamping portion and the first cavity are perpendicular to each other, and the limiting wings are respectively located on both sides of the connection between the first connecting portion and the first cavity.

6. The micro-tillage machine gearbox according to claim 5, characterized in that: The second control member includes a second connecting portion rotatably connected to the shell, a second clamping portion clamped to the second connecting member in the gearbox case, and a second cavity for accommodating the end of the shift rod, the second clamping portion and the second cavity are respectively connected to the first connecting portion, and the second clamping portion and the second cavity are perpendicular to each other, and the block can abut against the side of the second connecting portion.

7. The micro-tillage machine gearbox according to claim 6, characterized in that: The first connection part is fitted with the second connection part, the first connection part is provided with a first connection hole, the second connection part is provided with a second connection hole overlapping with the first connection hole, the second connection part and the first connection part are rotatably connected to the shell through the first connection hole and the second connection hole, the first connection part can be rotated relative to the second connection part and the shell, the second connection part can be rotated relative to the first connection part and the shell, when the first cavity and the second cavity are fitted, the center point of the first clamping part, the center point of the second clamping part and the center point of the first connection part are collinear, the shift lever is located between the first cavity and the second cavity, the lower end of the second cavity is opposite to the first cavity, and the upper end of the second cavity is located above the first cavity.

8. The micro-tillage machine gearbox according to claim 4, characterized in that: It also includes a third limiting member for limiting the position of the second control member. The first control member is close to the inner wall of the shell. The first control member can be fitted with the second control member. The second control member is located outside the first control member. The third limiting member is located outside the second control member and abuts against the outer surface of the second control member to limit the position. The third limiting member is fixedly connected to the shell.

9. The micro-tillage machine gearbox according to claim 4, characterized in that: A first sphere is provided in the middle of the shift lever, a through hole is provided in the shell, and the shift lever is rotatably connected to the shell through the first sphere and the through hole.

10. The micro-tillage machine gearbox according to claim 4, characterized in that: A second sphere is disposed at one end of the shift lever that can extend into the first control member.

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