Gear shifting mechanism, gearbox and mini-tiller

Abstract

The invention belongs to the technical field of transmission devices, and provides a gear shifting mechanism, a gearbox and a mini-tiller. The gear shifting mechanism comprises a base, a gear shifting rod, a first shifting fork assembly, a second shifting fork assembly, a third transmission mechanism and a fourth transmission mechanism, and the gear shifting rod is movably arranged on the base and provided with a first working position and a second working position; the third transmission mechanism is used for connecting the gear shifting rod at the first working position with the first rotating shaft in a transmission manner, so that the first rotating shaft rotates under the driving of the gear shifting rod; the fourth transmission mechanism is used for enabling the gear shifting rod located at the second working position to be in transmission connection with the second rotating shaft so that the second rotating shaft can be driven by the gear shifting rod to rotate. Two gear shifting mechanisms are controlled by one gear shifting rod, the number of the gear shifting rods is reduced, the structures of the gear shifting mechanisms are simplified, and the arrangement difficulty of the gear shifting rods and the cost of the gear shifting mechanisms are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices, and in particular to a shifting mechanism, a gearbox and a micro-tillage machine. Background Art

[0002] Micro-tillage machines are widely used in dry land, paddy fields, orchards in plains, mountains and hills. Micro-tillage machines can be used freely in the fields, which is convenient for users to use and store, eliminating the trouble that large agricultural machinery cannot enter mountain fields. Micro-tillage machines are powered by small diesel engines or gasoline engines and have the advantages of light weight, small size and simple structure.

[0003] At present, traditional micro-tillage machines all use one shift lever to control one shift mechanism, which results in a large number of shift levers, which are complicated, difficult to arrange, and high cost. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a shifting mechanism, a gearbox and a micro-tillage machine to solve or at least alleviate one or more of the above-mentioned technical problems or other problems existing in the prior art.

[0005] In a first aspect, the present invention provides a shift mechanism, including a base, a shift lever, a first shift fork assembly, a second shift fork assembly, a third transmission mechanism and a fourth transmission mechanism, wherein:

[0006] The shift lever is movably arranged on the base and has a first working position and a second working position;

[0007] The first shift fork assembly comprises: a first shift fork; a first rotating shaft, which is supported and can rotate around its own axis; and a first transmission mechanism, which is used to transmission-connect the first rotating shaft with the first shift fork, so that the first shift fork performs reciprocating linear motion under the drive of the first rotating shaft;

[0008] The second shift fork assembly comprises: a second shift fork; a second rotating shaft, which is supported and can rotate around its own axis; and a second transmission mechanism, which is used to transmission-connect the second rotating shaft with the second shift fork, so that the second shift fork performs reciprocating linear motion under the drive of the second rotating shaft;

[0009] The third transmission mechanism is used to transmission-connect the shift lever in the first working position with the first rotating shaft, so that the first rotating shaft rotates under the drive of the shift lever;

[0010] The fourth transmission mechanism is used to transmission-connect the shift lever in the second working position with the second rotating shaft, so that the second rotating shaft rotates under the drive of the shift lever.

[0011] Furthermore, the base includes: a base body; and a pivot fixedly disposed on the base and arranged parallel to the first rotating shaft and the second rotating shaft;

[0012] The shift lever comprises: a connecting sleeve rotatably sleeved outside the pivot; and a rod body, one end of which is hinged to the connecting sleeve;

[0013] The third transmission mechanism comprises: a first shift arm, which is rotatably sleeved outside the pivot, located at one end of the connecting sleeve, and has a first end and a second end, the first end of the first shift arm having a first groove which can accommodate the rod body and has an opening facing the connecting sleeve; a first connecting arm, one end of which is fixedly connected to the first rotating shaft; and a first connecting rod, one end of which is hinged to the second end of the first shift arm, and the other end of which is hinged to the other end of the first connecting arm;

[0014] The fourth transmission mechanism comprises: a second shift arm, which is rotatably sleeved outside the pivot and located at the other end of the connecting sleeve, and has a first end and a second end, the first end of the second shift arm having a second groove which can accommodate the rod body and has an opening facing the connecting sleeve; a second connecting arm, one end of which is fixedly connected to the second rotating shaft; and a second connecting rod, one end of which is hinged to the second end of the second shift arm and the other end of which is hinged to the other end of the second connecting arm;

[0015] When the shift lever is in the first working position, the rod body is located in the first groove; when the shift lever is in the second working position, the rod body is located in the second groove.

[0016] Furthermore, the shift lever has a third working position. When the shift lever is located at the third working position, the lever body is located between the first groove and the second groove.

[0017] Further, the first end and the second end of the first shift arm are vertically arranged, and the first end and the second end of the second shift arm are vertically arranged.

[0018] Further, the first connecting arm and the first connecting rod in the third transmission mechanism and the second connecting arm and the second connecting rod in the fourth transmission mechanism are respectively located on both sides of the pivot.

[0019] Furthermore, the first rotating shaft, the second rotating shaft and the pivot are arranged in the longitudinal direction.

[0020] Furthermore, the base also includes a limiting plate fixedly connected to the seat body, and a third limiting groove is arranged on the limiting plate. The rod body passes through the third limiting groove, and the rod body is restricted to move in the third limiting groove.

[0021] Further, the first transmission mechanism includes: a first fork shaft; a first sliding sleeve, which is sleeved outside the first fork shaft and can slide back and forth along the axial direction of the first fork shaft and is fixedly connected to the first fork; a first limit block, which is fixedly arranged on the first sliding sleeve and has a first limit groove; and a first swing arm, one end of which is fixedly connected to the first rotating shaft and the other end of which moves in the first limit groove;

[0022] The second transmission mechanism includes: a second fork shaft; a second sliding sleeve, which is sleeved outside the second fork shaft and can slide back and forth along the axial direction of the second fork shaft and is fixedly connected to the second fork; a second limit block, which is fixedly arranged on the second sliding sleeve and has a second limit groove; and a second swing arm, one end of which is fixedly connected to the second rotating shaft and the other end of which moves in the second limit groove.

[0023] In a second aspect, the present invention further provides a gearbox, comprising the shifting mechanism described in any one of the above items.

[0024] In a third aspect, the present invention further provides a micro-tillage machine, comprising the above-mentioned gearbox.

[0025] Beneficial effects of the present invention: A shift mechanism, a gearbox and a micro-tiller provided by the present invention adopt a shift lever to cooperate with the third transmission mechanism and the fourth transmission mechanism respectively, so that one shift lever can operate two shift mechanisms, the number of shift levers is reduced, the structure of the shift mechanism is simplified, and the difficulty of arranging the shift lever and the cost of the shift mechanism are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0027] Figure 1 A three-dimensional diagram of a gearbox provided by an embodiment of the present invention at a viewing angle;

[0028] Figure 2 A three-dimensional diagram of a gearbox provided by an embodiment of the present invention at another viewing angle;

[0029] Figure 3 for Figure 1 A three-dimensional diagram of a partial structure of a gearbox at one viewing angle;

[0030] Figure 4 for Figure 1 A three-dimensional diagram of the partial structure of the gearbox in another perspective;

[0031] Reference numerals:

[0032] 10. Box body; 11. Main shaft; 12. Output shaft; 13. Shift gear;

[0033] 21. seat body; 22. pivot; 23. limit plate; 231. third limit slot;

[0034] 31. Connecting sleeve; 32. Rod body;

[0035] 41, first shift fork; 42, first rotating shaft; 431, first shift fork shaft; 432, first sliding sleeve; 433, first limiting block; 4331, first limiting groove; 434, first swing arm;

[0036] 51, second shift fork; 52, second rotating shaft; 531, second shift fork shaft; 532, second sliding sleeve; 533, second limiting block; 5331, second limiting groove; 534, second swing arm;

[0037] 61. first shift arm; 62. first groove; 63. first connecting arm; 64. first connecting rod;

[0038] 71. Second shift arm; 72. Second groove; 73. Second connecting arm; 74. Second connecting rod. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0040] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] like Figure 1-4 As shown, this embodiment provides a micro-tillage machine, which includes a gearbox, which includes a housing 10, a main shaft 11, a secondary shaft, an output shaft 12 and a shifting mechanism, wherein the main shaft 11 is a power input shaft, and the secondary shaft is parallel to the main shaft 11 and is a power transmission shaft. There are two output shafts 12, which are respectively used to output power to the walking mechanism and the working mechanism of the micro-tillage machine. The main shaft 11, the secondary shaft and the output shaft 12 are all sleeved with a plurality of gears for transmitting power, and the gears can be fixed on the above-mentioned shafts, or they can rotate around the axes of the above-mentioned shafts, or they can move along the axes of the above-mentioned shafts. According to the different settings of the gear positions, the settings and quantities of the gears on the above-mentioned shafts will also be different accordingly. Since the focus of this embodiment is on the shifting mechanism, and the power transmission between the various shafts and gears in the gearbox is not the focus of this embodiment, the power transmission relationship between the various shafts and gears in the gearbox is not described in detail in this embodiment and other embodiments of this application.

[0046] The shift mechanism includes a base, a shift lever, a first fork assembly, a second fork assembly, a third transmission mechanism and a fourth transmission mechanism. The base is fixed outside the case 10 of the gearbox, and the shift lever is movably arranged on the base and has a first working position and a second working position. In addition, the shift lever can also have more working positions according to the needs of the gear position. The first working position and the second working position described here are special working positions, which will be described in detail later.

[0047] The first shift fork assembly includes a first shift fork 41, a first rotating shaft 42 and a first transmission mechanism, wherein the first shift fork is used to shift a shift gear 13 in the gearbox, so as to realize multiple working gears according to the shift gear 13 being in different working positions. The first rotating shaft 42 is supported by the housing 10 and can rotate around its own axis. Specifically, the first rotating shaft 42 is supported by the housing 10 of the gearbox, and the first rotating shaft 42 passes through the housing 10, with one end located inside the housing 10 and the other end located outside the housing 10. The first transmission mechanism is used to connect the first rotating shaft 42 with the first shift fork in a transmission manner, so that the first shift fork performs reciprocating linear motion under the drive of the first rotating shaft 42, that is, the rotational motion of the first rotating shaft 42 is converted into the reciprocating linear motion of the first shift fork.

[0048] Similarly, the second shift fork assembly includes a second shift fork 51, a second rotating shaft 52 and a second transmission mechanism, wherein the second shift fork is used to shift a shift gear 13 in the gearbox, so as to realize multiple working gears according to the shift gear 13 being in different working positions. The second rotating shaft 52 is supported by the housing 10 and can rotate around its own axis. Specifically, the second rotating shaft 52 is supported by the housing 10 of the gearbox, and the second rotating shaft 52 passes through the housing 10, with two ends located inside the housing 10 and the other two ends located outside the housing 10. The second transmission mechanism is used to connect the second rotating shaft 52 with the second shift fork in a transmission manner, so that the second shift fork performs reciprocating linear motion under the drive of the second rotating shaft 52, that is, the rotational motion of the second rotating shaft 52 is converted into the reciprocating linear motion of the second shift fork.

[0049] The third transmission mechanism is used to transmission connect the shift lever in the first working position with the first rotating shaft 42 so that the first rotating shaft 42 rotates under the drive of the shift lever. Specifically, when the shift lever is in the first working position, the shift lever can form a transmission connection with the third transmission mechanism, thereby converting the movement of the shift lever into the rotation of the first rotating shaft 42 through the third transmission mechanism.

[0050] Similarly, the fourth transmission mechanism is used to transmission connect the shift lever in the second working position with the second rotating shaft 52 so that the second rotating shaft 52 rotates under the drive of the shift lever. Specifically, when the shift lever is in the second working position, the shift lever can form a transmission connection with the fourth transmission mechanism, thereby converting the movement of the shift lever into the rotation of the second rotating shaft 52 through the third and fourth transmission mechanisms.

[0051] In this embodiment, a shift lever is used to cooperate with the third transmission mechanism and the fourth transmission mechanism respectively, so that one shift lever can operate two shift mechanisms, which reduces the number of shift levers, simplifies the structure of the shift mechanism, and reduces the difficulty of arranging the shift lever and the cost of the shift mechanism.

[0052] In one embodiment, the base includes a base body 21 and a pivot 22, the base body 21 is fixed on the housing 10 of the gearbox, the pivot 22 is fixedly arranged on the base and is arranged parallel to the first rotating shaft 42 and the second rotating shaft 52, that is, the pivot 22, the first rotating shaft 42 and the second rotating shaft 52 are parallel to each other. The shift lever includes a connecting sleeve 31 and a rod body 32, wherein the connecting sleeve 31 is rotatably sleeved outside the pivot 22, and one end of the rod body 32 is hinged to the connecting sleeve 31, so that the other end of the rod body 32 can swing around the hinge center. The third transmission mechanism includes a first shift arm 61, a first connecting arm 63 and a first connecting rod 64, and the fourth transmission mechanism includes a second shift arm 71, a second connecting arm 73 and a second connecting rod 74.

[0053] The first shift arm 61 is rotatably sleeved outside the pivot 22 and is located at one end of the connecting sleeve 31. The first shift arm 61 has a first end and a second end. The first end and the second end of the first shift arm 61 may form an acute angle, a right angle, an obtuse angle or a flat angle. The first end of the first shift arm 61 has a first groove 62 that can accommodate the rod body 32 and opens toward the connecting sleeve 31. One end of the first connecting arm 63 is fixedly connected to the first rotating shaft 42. Specifically, the above-mentioned one end of the first connecting arm 63 is fixedly connected to one end of the first rotating shaft 42 located outside the housing 10 of the gearbox. One end of the first connecting rod 64 is hinged to the second end of the first shift arm 61, and the other end is hinged to the other end of the first connecting arm 63.

[0054] The second shift arm 71 is rotatably sleeved outside the pivot 22 and is located at the other end of the connecting sleeve 31. The second shift arm 71 has a first end and a second end. The first end and the second end of the second shift arm 71 may form an acute angle, a right angle, an obtuse angle or a flat angle. The first end of the second shift arm 71 has a second groove 72 that can accommodate the rod body 32 and opens toward the connecting sleeve 31. One end of the second connecting arm 73 is fixedly connected to the second rotating shaft 52. Specifically, the one end of the second connecting arm 73 is fixedly connected to one end of the second rotating shaft 52 located outside the housing 10 of the gearbox. One end of the second connecting rod 74 is hinged to the second end of the second shift arm 71, and the other end is hinged to the other end of the second connecting arm 73.

[0055] The third transmission mechanism and the fourth transmission mechanism are both connecting rod mechanisms. When the shift lever is in the first working position, that is, the rod body 32 on the shift lever is swung so that the rod body 32 is located in the first groove 62, and then the operator manually shifts the rod body 32, so that the rod body 32 rotates around the axis of the pivot 22 together with the connecting sleeve 31. In this process, the third transmission mechanism and the first fork assembly work to achieve the switching of multiple working positions of the shift gear 13 on one of the output shafts 12. When the shift lever is in the second working position, that is, the rod body 32 on the shift lever is swung so that the rod body 32 is located in the second groove 72, and then the operator manually shifts the rod body 32, so that the rod body 32 rotates around the axis of the pivot 22 together with the connecting sleeve 31. In this process, the fourth transmission mechanism and the second fork assembly work to achieve the switching of multiple working positions of the shift gear 13 on the other output shaft 12.

[0056] In this embodiment, one shift lever is switched to cooperate with two connecting rod mechanisms, so that one shift lever can operate two shift mechanisms. The structure of the entire shift mechanism is simple and the cost is low.

[0057] In one embodiment, the shift lever further has a third working position. When the shift lever is in the third working position, the rod body 32 is located between the first groove 62 and the second groove 72. At this time, the rod body 32 is neither located in the first groove 62 nor in the second groove 72, that is, the shift lever is in a working position that is disengaged from the third transmission mechanism and the fourth transmission mechanism at the same time. In this case, a certain distance is maintained between the first end of the first shift arm 61 and the first end of the second shift arm 71, so that the rod body 32 can pass between the first end of the first shift arm 61 and the first end of the second shift arm 71 during the rotation of the connecting sleeve 31. If the shift lever only has the first working position and the second working position, the rod body 32 is either located in the first groove 62 or in the second groove 72. At this time, the first end of the first shift arm 61 and the first end of the second shift arm 71 are close to each other and only maintain a small distance. By making the shift lever have the third working position, it can be avoided that the working gear position of the first shift fork assembly or the second shift fork assembly is changed due to the shift lever being touched by mistake.

[0058] It should be noted that, in this embodiment and the aforementioned embodiments, when the shift lever is in any of the first working position, the second working position and the third working position, the shift lever actually moves within an area within a plane, rather than at a specific working point within a plane, and the range of movement of the shift lever when it is in different working positions may be the same or different.

[0059] In one embodiment, since the first fork assembly and the second fork assembly are respectively used to change the working position of the shift gear 13 on the two output shafts 12, and the two output shafts 12 are usually coaxially arranged, the first connecting rod 64 and the second connecting rod 74 both extend along the axial direction of the output shaft 12. In this case, the shift lever is installed at the end of one end of the gearbox housing 10, and then the first end and the second end of the first shift arm 61 are vertically arranged, and the first end and the second end of the second shift arm 71 are vertically arranged, then the rod body 32 of the shift lever can extend along the length direction of the gearbox housing 10 and swing back and forth in the width direction of the gearbox housing 10. In this way, the layout structure is more compact and reasonable, and the appearance is more beautiful.

[0060] In one embodiment, the first connecting arm 63 and the first connecting rod 64 in the third transmission mechanism and the second connecting arm 73 and the second connecting rod 74 in the fourth transmission mechanism are respectively located on both sides of the pivot 22. At the same time, the second end of the first shift arm 61 and the second end of the second shift arm 71 are also located on both sides of the pivot 22. In this way, the third transmission mechanism and the fourth transmission mechanism are arranged on both sides of the gearbox housing 10, and the structure is more compact and reasonable.

[0061] In one embodiment, since the gear shifting mechanism of the conventional micro-tillage machine is arranged on the side of the housing 10 and is located below the lubricating oil level, oil seepage and oil leakage will occur due to long-term wear and aging of the seal. Therefore, in this embodiment, the first rotating shaft 42, the second rotating shaft 52 and the pivot 22 are arranged longitudinally. At this time, the first rotating shaft 42 and the second rotating shaft 52 are arranged at the top of the housing 10 of the gearbox. The advantage of such an arrangement is that at the top position, the first rotating shaft 42 and the second rotating shaft 52 are not immersed in the lubricating oil, but only splashing oil. Even if the long-term use causes the wear and aging of the O-ring, the risk of oil leakage can be greatly reduced.

[0062] In one embodiment, the base further includes a limiting plate 23 fixedly connected to the base body 21, and a third limiting groove 231 is provided on the limiting plate 23. The rod body 32 passes through the third limiting groove 231, and the rod body 32 is limited to move in the third limiting groove 231. The third limiting groove 231 can improve the accuracy of the shifting operation of the shift lever. Since the movement trajectory of the shift lever in the first working position and the second working position is an arc, the limiting plate 23 is preferably an arc-shaped plate.

[0063] In one embodiment, the first transmission mechanism includes a first fork shaft 431, a first sleeve 432, a first stopper 433 and a first swing arm 434. The first fork shaft 431 is fixedly disposed in the housing 10 of the gearbox and is arranged parallel to the main shaft 11 and the output shaft 12 in the housing 10. The first sleeve 432 is sleeved outside the first fork shaft 431 and can slide back and forth along the axial direction of the first fork shaft 431 and is fixedly connected to the first fork. The first stopper 433 is fixed on the first sleeve 432, and has a first stopper groove 4331 thereon, and the first stopper groove 4331 is an open groove. One end of the first swing arm 434 is fixedly connected to the first rotating shaft 42, specifically, is fixedly connected to one end of the first rotating shaft 42 located in the box body 10, and the other end of the first swing arm 434 moves in the first limiting groove 4331. The other end of the first swing arm 434 can contact two oppositely arranged groove walls of the first limiting groove 4331 during the movement, thereby pushing the first fork to perform reciprocating linear motion.

[0064] The second transmission mechanism includes a second fork shaft 531, a second sleeve 532, a second stopper 533 and a second swing arm 534. The second fork shaft 531 is fixedly arranged in the housing 10 of the gearbox and is arranged parallel to the main shaft 11 and the output shaft 12 in the housing 10. The second sleeve 532 is sleeved outside the second fork shaft 531 and can slide back and forth along the axial direction of the second fork shaft 531 and is fixedly connected to the second fork. The second stopper 533 is fixed on the second sleeve 532, and has a second stopper groove 5331 thereon, and the second stopper groove 5331 is an open groove. The two ends of the second swing arm 534 are fixedly connected to the second rotating shaft 52, specifically, are fixedly connected to the two ends of the second rotating shaft 52 located in the box body 10. The other two ends of the second swing arm 534 move in the second limiting groove 5331. The above-mentioned other two ends of the second swing arm 534 can contact two oppositely arranged groove walls of the second limiting groove 5331 during the movement, thereby pushing the second fork to perform reciprocating linear motion.

[0065] In this embodiment, the first fork is supported by the first fork shaft 431 and the second fork is supported by the second fork shaft 531, so that the first fork and the second fork can be avoided from being directly arranged on the main shaft 11, thereby ensuring that the first fork and the second fork have a larger range of motion, so that the gearbox has multiple gears and a larger transmission ratio.

[0066] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A gear shifting mechanism, characterized in that: It includes a base, a shift lever, a first shift fork assembly, a second shift fork assembly, a third transmission mechanism and a fourth transmission mechanism, wherein: The shift lever is movably arranged on the base and has a first working position and a second working position; The first fork assembly comprises: A first shift fork (41); A first rotating shaft (42) is supported to rotate around its own axis; and a first transmission mechanism, used for transmission-connecting the first rotating shaft (42) and the first shift fork (41), so that the first shift fork (41) performs reciprocating linear motion under the drive of the first rotating shaft (42); The second fork assembly comprises: A second shift fork (51); A second rotating shaft (52) is supported to rotate around its own axis; and a second transmission mechanism, used for transmission-connecting the second rotating shaft (52) with the second shift fork (51), so that the second shift fork (51) performs reciprocating linear motion under the drive of the second rotating shaft (52); The third transmission mechanism is used to transmission-connect the shift lever in the first working position with the first rotating shaft (42), so that the first rotating shaft (42) rotates under the drive of the shift lever; The fourth transmission mechanism is used to transmission-connect the shift lever in the second working position with the second rotating shaft (52), so that the second rotating shaft (52) rotates under the drive of the shift lever.

2. The shift mechanism according to claim 1, characterized in that: The base comprises: A seat body (21); and A pivot (22) is fixedly disposed on the base and is arranged parallel to the first rotating shaft (42) and the second rotating shaft (52); The shift lever comprises: A connecting sleeve (31) is rotatably mounted outside the pivot (22); and A rod body (32), one end of which is hinged to the connecting sleeve (31); The third transmission mechanism comprises: A first shift arm (61) is rotatably sleeved outside the pivot (22) and is located at one end of the connecting sleeve (31), and has a first end and a second end; the first end of the first shift arm (61) has a first groove (62) that can accommodate the rod body (32) and has an opening facing the connecting sleeve (31); a first connecting arm (63), one end of which is fixedly connected to the first rotating shaft (42); and A first connecting rod (64), one end of which is hinged to the second end of the first shift arm (61), and the other end of which is hinged to the other end of the first connecting arm (63); The fourth transmission mechanism comprises: A second shift arm (71) is rotatably sleeved outside the pivot (22) and is located at the other end of the connecting sleeve (31), and has a first end and a second end. The first end of the second shift arm (71) has a second groove (72) that can accommodate the rod body (32) and has an opening facing the connecting sleeve (31); a second connecting arm (73), one end of which is fixedly connected to the second rotating shaft (52); and A second connecting rod (74), one end of which is hinged to the second end of the second shift arm (71), and the other end of which is hinged to the other end of the second connecting arm (73); When the shift lever is in the first working position, the rod body (32) is located in the first groove (62); when the shift lever is in the second working position, the rod body (32) is located in the second groove (72).

3. The shift mechanism according to claim 2, characterized in that: The shift lever also has a third working position. When the shift lever is located at the third working position, the rod body (32) is located between the first groove (62) and the second groove (72).

4. The shift mechanism according to claim 3, characterized in that: The first end and the second end of the first shift arm (61) are arranged vertically, and the first end and the second end of the second shift arm (71) are arranged vertically.

5. The shift mechanism according to claim 4, characterized in that: The first connecting arm (63) and the first connecting rod (64) in the third transmission mechanism and the second connecting arm (73) and the second connecting rod (74) in the fourth transmission mechanism are respectively located on both sides of the pivot (22).

6. The shift mechanism according to any one of claims 3 to 5, characterized in that: The first rotating shaft (42), the second rotating shaft (52) and the pivot shaft (22) are arranged along the longitudinal direction.

7. The shift mechanism according to any one of claims 2 to 5, characterized in that: The base further comprises a limiting plate (23) fixedly connected to the base body (21), the limiting plate (23) being provided with a third limiting groove (231), the rod body (32) passing through the third limiting groove (231), and the rod body (32) being restricted from moving in the third limiting groove (231).

8. The shift mechanism according to claim 1, characterized in that: The first transmission mechanism comprises: A first shift fork shaft (431); A first sliding sleeve (432), which is sleeved outside the first shift fork shaft (431) and can slide back and forth along the axial direction of the first shift fork shaft (431), and is fixedly connected to the first shift fork; A first limiting block (433) is fixedly arranged on the first sliding sleeve (432) and has a first limiting groove (4331); and A first swing arm (434), one end of which is fixedly connected to the first rotating shaft (42), and the other end of which moves in the first limiting groove (4331); The second transmission mechanism comprises: A second shift fork shaft (531); A second sliding sleeve (532), which is sleeved outside the second shift fork shaft (531) and can slide back and forth along the axial direction of the second shift fork shaft (531), and is fixedly connected to the second shift fork; A second limiting block (533) is fixedly arranged on the second sliding sleeve (532) and has a second limiting groove (5331); and The second swing arm (534) has one end fixedly connected to the second rotating shaft (52) and the other end movable in the second limiting groove (5331).

9. A gearbox, characterized in that: It comprises a shift mechanism as described in any one of claims 1 to 8.

10. A micro-tillage machine, characterized in that: Comprising a gearbox as claimed in claim 9.

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