Rear box gear transmission mechanism of four-wheel-drive mini-tiller

Abstract

The utility model relates to a four-wheel-drive mini-tiller rear box gear transmission mechanism, which relates to the technical field of four-wheel-drive mini-tiller gearbox transmission systems and comprises a rear box, an auxiliary input shaft and an auxiliary output shaft are arranged in the rear box, the auxiliary input shaft is in transmission connection with a main input shaft in a front box, and the auxiliary output shaft is in transmission connection with the auxiliary input shaft. A transition shaft perpendicular to the auxiliary output shaft is further horizontally arranged in the rear box in a penetrating mode, the transition shaft is in transmission connection with the auxiliary output shaft, and a transition gear used for being meshed with gears in other box bodies is coaxially arranged on the transition shaft. The main input shaft drives the transition shaft to rotate through the auxiliary input shaft, the transition shaft drives the transition gear to rotate, when other box bodies are externally connected, the transition gear is meshed with the gear with the transmission function in the other box bodies, power transmission of the other box bodies is achieved, and when the other box bodies are not needed to be externally connected, the transition gear can also be meshed with a cutter shaft or a walking shaft. And axial thrust cannot be generated, so that the transmission effect of the gearbox of the four-wheel-drive mini-tiller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a gearbox transmission system of a four-wheel drive micro-tillage machine, in particular to a rear box gear transmission mechanism of a four-wheel drive micro-tillage machine. Background Art

[0002] A micro-tiller is a small tillage machine, which is mainly powered by a small diesel engine or gasoline engine. It drives the tillage blade assembly through a transmission system to till the land. A four-wheel drive micro-tiller is a type of micro-tiller. Common four-wheel drive micro-tillers include an engine system, a gearbox, a tool mechanism and a traveling mechanism. The engine system is connected to the gearbox, and the gearbox includes a front box and a rear box. The front box and the rear box are respectively connected to the tool mechanism and the traveling mechanism through a transmission system.

[0003] In the related art, reference can be made to the Chinese utility model patent with authorization announcement number CN220023530U, which discloses a four-wheel drive micro-tiller transmission assembly and a four-wheel drive micro-tiller, including a main shaft, a walking shaft, a rotary tillage shaft, and a shift fork. The surface of the main shaft is provided with a walking high and low speed gear set and a rotary tillage high and low speed gear set. The surface of the walking gear set is provided with a first transmission mechanism, and the inner wall of the rotary tillage gear set is provided with a second transmission mechanism. The second transmission mechanism is installed on the surface of the rotary tillage shaft. The first transmission mechanism includes a driving gear and a transmission gear. The driving gear is connected to a first bevel gear through a driving shaft. The first bevel gear is meshed with a first end face gear. The first end face gear is connected to a second bevel gear through a transmission shaft. The second bevel gear surface is meshed with a second end face gear. The second end face gear is installed on the surface of the walking shaft. The second transmission mechanism is consistent with the first transmission mechanism, and the bottom is a rotary tillage shaft.

[0004] The power is transmitted to the walking shaft and the rotary tilling shaft respectively through the first transmission mechanism and the second transmission mechanism. The walking shaft and the rotary tilling shaft both transmit power through bevel gear transmission. However, with the development of the multi-functions of micro-tillers, it is necessary to configure a new transmission system on the micro-tiller to achieve a multi-function combination, such as supporting grass cutting, snow clearing, branch and leaf crushing, ditching, backfilling and other components. However, the rotary tilling shaft and the walking shaft are respectively connected to tools and walking wheels, and cannot be used as power transmission shafts to transmit power to the new transmission box. If the drive shaft is directly connected to the new transmission box, axial thrust will be generated, reducing the transmission effect, thereby reducing the transmission effect of the four-wheel drive micro-tiller gearbox. Utility Model Content

[0005] In order to improve the transmission effect of the gearbox of a four-wheel drive micro-tillage machine, the utility model provides a rear box gear transmission mechanism of the four-wheel drive micro-tillage machine.

[0006] The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine provided in this application adopts the following technical solution:

[0007] A gear transmission mechanism for a rear box of a four-wheel drive micro-tiller comprises a rear box, wherein a secondary input shaft and a secondary output shaft are horizontally passed through the rear box, wherein the secondary input shaft is transmission-connected to a main input shaft in a front box via a gear set, wherein the secondary output shaft is transmission-connected to the secondary input shaft via a transmission component, wherein a transition shaft perpendicular to the secondary output shaft is also horizontally passed through the rear box, wherein the transition shaft is transmission-connected to the secondary output shaft via a bevel gear set, and wherein a transition gear for meshing with gears in other boxes is coaxially provided on the transition shaft.

[0008] By adopting the above technical solution, power is output to the main input shaft through the engine system, the main input shaft transmits power to the secondary input shaft through gear transmission, the secondary input shaft transmits power to the secondary output shaft through the transmission component, the secondary output shaft transmits power to the transition shaft through the bevel gear set, the transition shaft drives the transition gear to rotate, and when other boxes are connected externally, the transition gear is engaged with the gears with transmission function in the other boxes to realize power transmission to other boxes externally, and when no other boxes are needed to be connected externally, the tool shaft or the walking shaft can also be engaged through the transition gear, and no axial thrust is generated, thereby improving the transmission effect of the four-wheel drive micro-tiller gearbox.

[0009] Optionally, the transmission component includes:

[0010] A transmission shaft, which is horizontally arranged in the rear box and parallel to the auxiliary input shaft, and is connected to the auxiliary input shaft through a shift assembly;

[0011] A double-speed gear, wherein the double-speed gear is coaxially arranged on the transmission shaft, and the rear box is provided with a first shift fork for shifting the double-speed gear to move axially along the transmission shaft;

[0012] A primary gear, the primary gear being coaxially arranged on the secondary output shaft;

[0013] A secondary gear, the secondary gear is coaxially arranged on the secondary output shaft and has an outer diameter larger than the primary gear, the primary gear is meshed with one gear of the double-speed gear at the primary speed, and the secondary gear is meshed with the other gear of the double-speed gear at the secondary speed;

[0014] The reverse gear assembly is arranged in the rear box and between the auxiliary input shaft and the transmission shaft.

[0015] By adopting the above technical solution, the auxiliary input shaft transmits power to the transmission shaft through the shifting assembly, and the rotation of the transmission shaft drives the double-speed gear to rotate. The position of the double-speed gear is shifted by the first shift fork, so that the double-speed gear is meshed with the primary gear or the secondary gear, thereby driving the auxiliary output shaft to rotate through the transmission shaft. When the primary gear is meshed with the double-speed gear, the speed of the auxiliary output shaft is greater than the speed when the secondary gear is meshed with the double-speed gear, so as to meet the requirements of different gears and different speeds. When reverse gear is required, the reverse gear assembly is started to change the power transmission direction between the auxiliary input shaft and the auxiliary output shaft to meet the reverse gear requirement of the micro-tiller. In combination with the transition shaft and the transition gear, the use scenario of the micro-tiller is improved, thereby improving the transmission effect of the gearbox of the four-wheel drive micro-tiller.

[0016] Optionally, the shift assembly includes:

[0017] A double shift gear, the double shift gear is coaxially arranged on the auxiliary input shaft, and the rear box is provided with a second shift fork for shifting the double shift gear to move axially along the auxiliary input shaft;

[0018] A first gear, the first gear being coaxially arranged on the transmission shaft;

[0019] The second gear is coaxially arranged on the transmission shaft, the outer diameter of the first gear is larger than the outer diameter of the second gear, the first gear is meshed with one of the gears of the double shift gear in the first gear, and the second gear is meshed with the other gear of the double shift gear in the second gear.

[0020] By adopting the above technical scheme, according to the gear requirements, the second shift fork is used to shift the double-speed gear to engage with the first gear gear or the second gear gear, thereby realizing the power transmission of the auxiliary input shaft to the transmission shaft, and the first shift fork is used to shift the position of the double-speed gear to make the double-speed gear engage with the first gear or the second gear, thereby driving the auxiliary output shaft to rotate through the transmission shaft, thereby realizing the requirements of different gears and different speeds of the four-wheel drive micro-tillage machine gearbox, and cooperating with the transition shaft and the transition gear to improve the transmission effect of the four-wheel drive micro-tillage machine gearbox.

[0021] Optionally, the reverse gear assembly includes:

[0022] A reverse gear shaft, the reverse gear shaft is horizontally arranged in the rear box and is parallel to the auxiliary input shaft;

[0023] A reverse gear, which is coaxially arranged on the reverse shaft and meshes with the double shift gear when in reverse gear;

[0024] A reverse gear transmission gear, wherein the reverse gear transmission gear is coaxially arranged on the reverse gear shaft;

[0025] A reverse gear drive gear is coaxially arranged on the transmission shaft and meshes with the reverse gear transmission gear.

[0026] By adopting the above technical solution, when reverse gear is needed, the double shift gear is toggled to disengage the first gear gear and the second gear gear, so that the double shift gear is meshed with the reverse gear gear, the auxiliary input shaft drives the reverse gear shaft to rotate through the double shift gear and the reverse gear gear, the reverse gear shaft drives the transmission shaft to rotate through the reverse transmission gear and the reverse drive gear, and the transmission shaft then drives the auxiliary output shaft to rotate through the double speed gear and the first gear or the second gear meshing, thereby realizing the reverse gear operation of the gearbox of the four-wheel drive micro-tillage machine, cooperating with the transition shaft and the transition gear, and improving the transmission effect of the gearbox of the four-wheel drive micro-tillage machine.

[0027] Optionally, the gear set includes:

[0028] A driving gear, the driving gear being coaxially arranged on one end of the main input shaft extending to the rear box;

[0029] The driven gear is coaxially arranged on the auxiliary input shaft and meshes with the driving gear.

[0030] By adopting the above technical solution, the main input shaft rotates to drive the driving gear to rotate, and the driving gear drives the auxiliary input shaft to rotate through the driven gear, thereby realizing power transmission between the main input shaft and the auxiliary input shaft.

[0031] Optionally, the bevel gear set comprises:

[0032] An active bevel gear, wherein the active bevel gear is coaxially fixed on the auxiliary output shaft;

[0033] The driven bevel gear is coaxially arranged on the transition shaft and meshes with the driving bevel gear.

[0034] By adopting the above technical solution, the power is transmitted to the auxiliary output shaft through the main input shaft, the auxiliary input shaft and the transmission shaft. The auxiliary output shaft drives the transition shaft to rotate through the active bevel gear and the driven bevel gear, so as to realize the power transmission between the auxiliary output shaft and the transition shaft. The power transmission direction is changed and the axial thrust is borne by the cooperation of the driven bevel gear and the active bevel gear. When the next level of power transmission is carried out through the transition gear, there is no need to bear the axial thrust, thereby improving the transmission effect of the four-wheel drive micro-tiller gearbox.

[0035] Optionally, the axis connecting the auxiliary input shaft, the transmission shaft and the reverse gear shaft is in the shape of a triangle, and the axis of the auxiliary input shaft, the transmission shaft and the reverse gear shaft are respectively located at three vertices.

[0036] By adopting the above technical solution, the triangular arrangement facilitates the operation of shifting and changing the speed of the first shift fork, while saving installation space and reducing the space occupied by the rear box.

[0037] Optionally, support bearings are provided between the auxiliary input shaft, the transmission shaft, the reverse gear shaft and the auxiliary output shaft and the rear box.

[0038] By adopting the above technical solution, multiple support bearings respectively support the auxiliary input shaft, the transmission shaft, the reverse gear shaft and the auxiliary output shaft to improve the stability of the transmission in the rear box of the four-wheel drive micro-tiller gearbox, thereby improving the transmission effect of the four-wheel drive micro-tiller gearbox.

[0039] In summary, the present application includes at least one of the following beneficial technical effects:

[0040] The power is output to the main input shaft through the engine system, the main input shaft transmits the power to the secondary input shaft through gear transmission, the secondary input shaft transmits the power to the secondary output shaft through the transmission component, the secondary output shaft transmits the power to the transition shaft through the bevel gear set, the transition shaft drives the transition gear to rotate, when other boxes are connected externally, the transition gear is engaged with the gears with transmission function in the other boxes to realize the power transmission of the externally connected other boxes, when there is no need to connect to other boxes externally, the tool shaft or the travel shaft can also be engaged through the transition gear, and no axial thrust is generated, thereby improving the transmission effect of the four-wheel drive micro-tiller gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is an internal perspective view of the rear box in this application;

[0042] Figure 2 It is a structural schematic diagram of the transition shaft in this application;

[0043] Figure 3 It is a schematic diagram of the structure of the gear set and the shift assembly in this application;

[0044] Figure 4 It is a structural schematic diagram of the reverse gear assembly in this application.

[0045] Figure numerals: 1, rear box; 11, main input shaft; 12, transition shaft; 13, transition gear; 14, support bearing; 2, secondary input shaft; 3, secondary output shaft; 4, gear set; 41, driving gear; 42, driven gear; 5, transmission component; 51, transmission shaft; 52, double-speed gear; 53, primary gear; 54, secondary gear; 55, reverse gear assembly; 551, reverse gear shaft; 552, reverse gear; 553, reverse transmission gear; 554, reverse drive gear; 6, bevel gear set; 61, driving bevel gear; 62, driven bevel gear; 7, shift assembly; 71, double-speed gear; 72, first gear; 73, second gear. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-4 This application is described in further detail.

[0047] The embodiment of the present application discloses a rear box gear transmission mechanism of a four-wheel drive micro-tillage machine.

[0048] Reference Figure 1 and Figure 2 A gear transmission mechanism for a rear box of a four-wheel drive micro-tiller comprises a rear box 1, in which a secondary input shaft 2 and a secondary output shaft 3 are horizontally passed through the rear box 1, the secondary input shaft 2 is connected to a main input shaft 11 in the front box through a gear set 4, the secondary output shaft 3 is connected to the secondary input shaft 2 through a transmission component 5, a transition shaft 12 perpendicular to the secondary output shaft 3 is also horizontally passed through the rear box 1, the transition shaft 12 is connected to the secondary output shaft 3 through a bevel gear set 6, and a transition gear 13 for meshing with gears in other boxes is coaxially provided on the transition shaft 12.

[0049] Reference Figure 1 and Figure 2 In this embodiment, the micro-tiller gearbox includes a front box (not shown in the figure) and a rear box 1. The rear box 1 is connected to the front box by bolts. The main input shaft 11 is horizontally arranged in the front box. The end of the main input shaft 11 away from the rear box 1 is connected to the engine system. The engine system transmits power to the main input shaft 11, and the end of the main input shaft 11 away from the engine system extends horizontally into the rear box 1.

[0050] Reference Figure 1 and Figure 2 The rear box 1 has an opening at one end away from the main input shaft 11, and the transition shaft 12 is arranged at the opening. When other boxes are connected externally, the other boxes can be gear boxes or travel boxes, etc. The other boxes are connected to the opening of the rear box 1, so that the gears in the other boxes are meshed with the transition gear 13. When there is no need to connect other boxes externally, the tool shaft or travel shaft can also be meshed through the transition gear 13.

[0051] Reference Figure 1 , Figure 2 and Figure 3 The auxiliary input shaft 2 is horizontally arranged in the rear box 1 and is located below the main input shaft 11 and is parallel to the main input shaft 11. The gear set 4 includes a driving gear 41 and a driven gear 42. The driving gear 41 is coaxially fixed on one end of the main input shaft 11 extending to the rear box 1. The driven gear 42 is coaxially fixed on the auxiliary input shaft 2 and meshes with the driving gear 41. The rotation of the main input shaft 11 drives the auxiliary input shaft 2 to rotate in the same direction through the driving gear 41 and the driven gear 42, thereby realizing power transmission between the main input shaft 11 and the auxiliary input shaft 2.

[0052] Reference Figure 1 , Figure 2 and Figure 3 The auxiliary output shaft 3 is horizontally arranged in the rear box 1 and is located below the auxiliary input shaft 2 and parallel to the auxiliary output shaft 3. The transmission component 5 includes a transmission shaft 51, which is horizontally arranged in the rear box 1 and is parallel to the auxiliary input shaft 2. The transmission shaft 51 is located between the auxiliary input shaft 2 and the auxiliary output shaft 3, and the transmission shaft 51 is connected to the auxiliary input shaft 2 through the gear shift assembly 7.

[0053] Reference Figure 1 , Figure 2 and Figure 3 The shift assembly 7 includes a double shift gear 71, a first gear gear 72 and a second gear gear 73. The double shift gear 71 is coaxially arranged on the auxiliary input shaft 2, and a second shift fork (not shown in the figure) is arranged upwardly and backwardly for shifting the double shift gear 71 to move axially along the auxiliary input shaft 2. The movement of the double shift gear 71 by the second shift fork does not affect the rotation of the double shift gear 71 along the auxiliary input shaft 2.

[0054] Reference Figure 1 , Figure 3 and Figure 4 The first gear gear 72 is coaxially fixed on the transmission shaft 51, and the second gear gear 73 is coaxially fixed on the transmission shaft 51. The outer diameter of the first gear gear 72 is greater than the outer diameter of the second gear gear 73. In the first gear, the first gear gear 72 is meshed with one of the gears of the double shift gear 71, and the second gear gear 73 is disengaged from the other gear of the double shift gear 71. In the second gear, the first gear gear 72 is disengaged from the double shift gear 71, and the second gear gear 73 is meshed with the other gear of the double shift gear 71.

[0055] Reference Figure 1 , Figure 3 and Figure 4 The transmission component 5 also includes a double-speed gear 52, a first gear 53, a second gear 54 and a reverse gear assembly 55. The double-speed gear 52 is coaxially arranged on the transmission shaft 51. The rear box 1 is provided with a first shift fork (not shown in the figure) for shifting the double-speed gear 52 to move axially along the transmission shaft 51. The first shift fork shifts the double-speed gear 52 without affecting the synchronous rotation of the double-speed gear 52 with the transmission shaft 51, and the rotation and movement of the double-speed gear 52 and the double-shift gear 71 do not affect each other.

[0056] Reference Figure 1 , Figure 3 and Figure 4 The first-stage gear 53 is coaxially fixed on the auxiliary output shaft 3, and the second-stage gear 54 is coaxially fixed on the auxiliary output shaft 3 and has an outer diameter larger than the first-stage gear 53. At the first-stage speed, the first-stage gear 53 is meshed with one of the gears of the double-speed gear 52, and the second-stage gear 54 is disengaged from the double-speed gear 52. At the second-stage speed, the first-stage gear 53 is disengaged from the double-speed gear 52, and the second-stage gear 54 is meshed with the other gear of the double-speed gear 52. When the four-wheel drive micro-tillage machine is working, only one gear of the double-speed gear 52 is in meshing state. When the first-stage gear 53 is meshed with the double-speed gear 52, the rotation speed of the auxiliary output shaft 3 is greater than the rotation speed when the second-stage gear 54 is meshed with the double-speed gear 52.

[0057] Reference Figure 1 , Figure 3and Figure 4 The reverse gear assembly 55 is arranged in the rear box 1 and is located between the auxiliary input shaft 2 and the transmission shaft 51. The reverse gear assembly 55 includes a reverse gear shaft 551, a reverse gear 552, a reverse gear transmission gear 553 and a reverse gear driving gear 554. The reverse gear shaft 551 is horizontally penetrated in the rear box 1 and is parallel to the auxiliary input shaft 2.

[0058] Reference Figure 2 and Figure 4 The axis connecting the auxiliary input shaft 2, the transmission shaft 51 and the reverse gear shaft 551 is a triangle, and the axis of the auxiliary input shaft 2, the transmission shaft 51 and the reverse gear shaft 551 are respectively located at three vertices, and support bearings 14 are provided between the auxiliary input shaft 2, the transmission shaft 51, the reverse gear shaft 551 and the auxiliary output shaft 3 and the rear box 1.

[0059] Reference Figure 3 and Figure 4 The reverse gear 552 is coaxially fixed on the reverse gear shaft 551. When the reverse gear is in reverse gear, the reverse gear 552 is engaged with the double shift gear 71, and the first gear gear 72 and the second gear gear 73 are both disengaged from the double shift gear 71, that is, when the four-wheel drive micro-tillage machine is working, only one gear of the double shift gear 71 is in meshing state.

[0060] Reference Figure 3 and Figure 4 The reverse gear transmission gear 553 is coaxially fixed on the reverse gear shaft 551 , and the reverse gear drive gear 554 is coaxially fixed on the transmission shaft 51 and meshes with the reverse gear transmission gear 553 .

[0061] Reference Figure 1 , Figure 3 and Figure 4 During normal operation, the double shift gear 71 is moved to engage with the first gear 72 or the second gear 73, and the double speed gear 52 is moved to engage with the primary gear 53 or the secondary gear 54. The secondary input shaft 2 drives the transmission shaft 51 to rotate, and the rotation direction of the transmission shaft 51 is opposite to that of the secondary input shaft 2. The transmission shaft 51 drives the secondary output shaft 3 to rotate through the double speed gear 52, and the secondary output shaft 3 drives the transition shaft 12 to rotate through the bevel gear set 6, thereby realizing power transmission.

[0062] Reference Figure 1 , Figure 3 and Figure 4When shifting in reverse gear, the double shift gear 71 is moved to engage with the reverse gear 552. At this time, the first gear gear 72 and the second gear gear 73 are disengaged from the double shift gear 71. The auxiliary input shaft 2 rotates through the double shift gear 71 and the reverse gear 552 to drive the reverse shaft 551 to rotate. The reverse shaft 551 drives the transmission shaft 51 to rotate through the reverse transmission gear 553 and the reverse drive gear 554. At this time, the rotation direction of the transmission shaft 51 is consistent with the rotation direction of the auxiliary input shaft 2. The transmission shaft 51 drives the auxiliary output shaft 3 to rotate. The auxiliary output shaft 3 drives the transition shaft 12 to rotate through the bevel gear set 6, thereby realizing power transmission in reverse gear.

[0063] Reference Figure 1 and Figure 2 The bevel gear set 6 includes an active bevel gear 61 and a driven bevel gear 62. The active bevel gear 61 is coaxially fixed on the auxiliary output shaft 3, and the driven bevel gear 62 is coaxially fixed on the transition shaft 12 and meshes with the active bevel gear 61. The driven bevel gear 62 and the transition gear 13 are arranged at intervals. In other embodiments, the auxiliary output shaft 3 can be a bevel gear shaft, and the driven bevel gear 62 meshes with one end of the bevel gear shaft having a bevel gear structure.

[0064] Reference Figure 1 and Figure 2 The secondary output shaft 3 drives the transition shaft 12 to rotate through the active bevel gear 61 and the driven bevel gear 62, and the transition shaft 12 drives the transition gear 13 to rotate synchronously. When other boxes are connected externally, the other boxes are connected to the opening of the rear box 1, so that the gears with transmission functions in the other boxes are meshed with the transition gear 13 to realize power transmission of other external boxes. When there is no need to connect other boxes externally, the tool shaft or the walking shaft can also be meshed through the transition gear 13, and no axial thrust will be generated, thereby improving the transmission effect of the four-wheel drive micro-tillage machine gearbox.

[0065] The working principle of the embodiment of the present application is as follows:

[0066] During normal operation, the engine system drives the main input shaft 11 to rotate, and the main input shaft 11 drives the transition shaft 12 to rotate through the secondary input shaft 2, the transmission shaft 51, and the secondary output shaft 3. When in reverse gear, the main input shaft 11 drives the transition shaft 12 to rotate through the secondary input shaft 2, the reverse gear shaft 551, the transmission shaft 51, and the secondary output shaft 3, and the transition shaft 12 drives the transition gear 13 to rotate synchronously, thereby realizing power transmission of the four-wheel drive micro-tiller.

[0067] When other boxes are connected externally, the other boxes are connected to the opening of the rear box 1, so that the gears with transmission function in the other boxes are meshed with the transition gear 13 to realize power transmission of the other boxes. When other boxes are not needed to be connected externally, the tool shaft or the travel shaft can also be meshed through the transition gear 13, and no axial thrust will be generated, thereby improving the transmission effect of the four-wheel drive micro-tillage machine gearbox.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rear box gear transmission mechanism for a four-wheel drive micro-tillage machine, characterized in that: The invention comprises a rear box (1), wherein a secondary input shaft (2) and a secondary output shaft (3) are horizontally passed through the rear box (1), wherein the secondary input shaft (2) is transmission-connected to a main input shaft (11) in the front box via a gear set (4), wherein the secondary output shaft (3) is transmission-connected to the secondary input shaft (2) via a transmission component (5), wherein a transition shaft (12) perpendicular to the secondary output shaft (3) is also horizontally passed through the rear box (1), wherein the transition shaft (12) is transmission-connected to the secondary output shaft (3) via a bevel gear set (6), wherein a transition gear (13) for meshing with gears in other boxes is coaxially provided on the transition shaft (12).

2. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 1 is characterized in that: The transmission component (5) comprises: A transmission shaft (51), the transmission shaft (51) is horizontally arranged in the rear box (1) and is parallel to the auxiliary input shaft (2), and the transmission shaft (51) is transmission-connected to the auxiliary input shaft (2) via a shift assembly (7); A double-speed gear (52), wherein the double-speed gear (52) is coaxially arranged on the transmission shaft (51), and the rear box (1) is provided with a first shift fork for shifting the double-speed gear (52) to move axially along the transmission shaft (51); A first-stage gear (53), the first-stage gear (53) being coaxially arranged on the secondary output shaft (3); a secondary gear (54), the secondary gear (54) being coaxially arranged on the secondary output shaft (3) and having an outer diameter larger than the primary gear (53); the primary gear (53) being meshed with one gear of the double-speed gear (52) at the primary speed, and the secondary gear (54) being meshed with the other gear of the double-speed gear (52) at the secondary speed; A reverse gear assembly (55) is arranged in the rear box (1) and located between the auxiliary input shaft (2) and the transmission shaft (51).

3. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 2 is characterized in that: The shift assembly (7) comprises: A double shift gear (71), the double shift gear (71) being coaxially arranged on the secondary input shaft (2), and the rear box (1) being provided with a second shift fork for shifting the double shift gear (71) to move axially along the secondary input shaft (2); A first gear (72), the first gear (72) being coaxially arranged on the transmission shaft (51); A second gear (73) is coaxially arranged on the transmission shaft (51); the outer diameter of the first gear (72) is larger than the outer diameter of the second gear (73); in the first gear, the first gear (72) meshes with one of the gears of the double gearshift gear (71); in the second gear, the second gear (73) meshes with the other gear of the double gearshift gear (71).

4. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 3 is characterized in that: The reverse gear assembly (55) comprises: A reverse gear shaft (551), wherein the reverse gear shaft (551) is horizontally arranged in the rear box (1) and is parallel to the auxiliary input shaft (2); A reverse gear (552), wherein the reverse gear (552) is coaxially arranged on the reverse gear shaft (551), and when in reverse gear, the reverse gear (552) meshes with the double shift gear (71); A reverse gear transmission gear (553), wherein the reverse gear transmission gear (553) is coaxially arranged on the reverse gear shaft (551); A reverse gear drive gear (554) is coaxially arranged on the transmission shaft (51) and meshes with the reverse gear transmission gear (553).

5. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 1 is characterized in that: The gear set (4) comprises: A driving gear (41), the driving gear (41) being coaxially arranged on one end of the main input shaft (11) extending to the rear box (1); A driven gear (42) is coaxially arranged on the auxiliary input shaft (2) and meshes with the driving gear (41).

6. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 1, characterized in that: The bevel gear set (6) comprises: A driving bevel gear (61), wherein the driving bevel gear (61) is coaxially fixed on the auxiliary output shaft (3); A driven bevel gear (62) is coaxially arranged on the transition shaft (12) and meshes with the driving bevel gear (61).

7. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 4 is characterized in that: The axis connecting the auxiliary input shaft (2), the transmission shaft (51) and the reverse gear shaft (551) is in the shape of a triangle, and the axis of the auxiliary input shaft (2), the transmission shaft (51) and the reverse gear shaft (551) are respectively located at three vertices.

8. The rear box gear transmission mechanism of the four-wheel drive micro-tillage machine according to claim 4, characterized in that: Support bearings (14) are provided between the auxiliary input shaft (2), the transmission shaft (51), the reverse gear shaft (551) and the auxiliary output shaft (3) and the rear box (1).

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