Gearbox for steering and mini-tiller

Abstract

The gearbox comprises a box body, a driving shaft set and an auxiliary shaft which are arranged in parallel are arranged in the box body, and the driving shaft set comprises an input shaft used for being connected with an agricultural machine axle and an output shaft used for being connected with wheels. The input shaft and the output shaft are coaxially arranged on the box body in a relative rotation manner; an input gear capable of axially moving is arranged on the input shaft, and an output gear is arranged on the output shaft; the auxiliary shaft is provided with a first gear and a second gear which are respectively meshed with the input gear and the output gear; a shifting fork mechanism used for driving the input gear to move axially is arranged on the box body, so that the input gear can be switched to a transmission connection state or a transmission disconnection state between the input shaft and the first gear. The gearbox and the mini-tiller have the advantages of being reasonable in structural design, low in operation difficulty, beneficial to reducing labor intensity and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a gearbox for steering and a micro-tillage machine. Background Art

[0002] A micro-tiller is a small agricultural machine widely used for ditching, soiling, weeding, and digging trenches due to its small size, light weight, and easy operation. A micro-tiller typically has two wheels mounted on either end of an axle that passes through a travel box. During operation, the two wheels rotate at the same speed, requiring the operator to manually move the handle to turn the micro-tiller. Furthermore, the rotation of the inner wheel increases the micro-tiller's turning radius, making operation difficult. This increases labor intensity and affects tillage efficiency. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a gearbox and a micro-tillage machine with reasonable structural design, low operating difficulty, and conducive to reducing labor intensity.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A gearbox for steering, comprising a housing, wherein the housing has a drive shaft group and a countershaft arranged in parallel, the drive shaft group comprising an input shaft for connecting to an agricultural machinery wheel axle and an output shaft for connecting to a wheel, the input shaft and the output shaft being coaxially arranged on the housing so as to be rotatable relative to each other; the input shaft is provided with an axially movable input gear, and the output shaft is provided with an output gear; the countershaft has a first gear and a second gear respectively meshed with the input gear and the output gear; the housing is provided with a shift fork mechanism for driving the input gear to move axially, so that the input gear can be switched between the input shaft and the first gear to a transmission connected state or a transmission disconnected state.

[0006] During use, two gearboxes are positioned on either side of the agricultural machine, with the ends of the agricultural machine's wheel axles connected to the input shafts of the two gearboxes, and the wheels connected to the output shafts of the two gearboxes. A shift fork mechanism is used to shift the input gear on one gearbox so that the input shaft is in a transmission connection with the first gear. Power is then transmitted via the input shaft to the countershaft via the meshing first gear, and then from the countershaft's second gear to the meshing output gear, and then out to the output shaft. The shift fork mechanism is used to shift the input gear on the other gearbox so that the input shaft is in a transmission disconnected state with the first gear. This disconnects the power output from the input shaft, allowing the agricultural machine to steer based on the speed difference between the two wheels. This significantly reduces the difficulty of steering, reduces operator workload, and improves farming efficiency. By shifting the input gears of both gearboxes between the input shaft and the first gear, the wheels on both sides rotate at the same speed, allowing the agricultural machine to travel straight.

[0007] Furthermore, an elastic member is provided on the input shaft, and one end of the elastic member abuts against the input gear, so that the input gear is in a transmission connection state between the input shaft and the first gear.

[0008] Furthermore, the input gear is relatively rotatably sleeved on the input shaft, the input shaft has a protruding synchronization disk, a detachable coupling mechanism is provided between the synchronization disk and the side opposite to the input gear, and the elastic member is located on the side of the input gear away from the synchronization disk.

[0009] Furthermore, the coupling mechanism includes coupling grooves uniformly distributed along the circumferential direction on the synchronization disk or the input gear, and coupling blocks that can be embedded in the coupling grooves are protrudingly provided on the input gear or the synchronization disk.

[0010] Furthermore, the input gear and the first gear are in a meshing state when the coupling groove and the coupling block are coupled or disengaged.

[0011] In this way, the input gear can always remain engaged with the first gear during the axial movement. During operation, it is only necessary to complete the engagement and disengagement between the engagement groove and the engagement block, without the need to engage the input gear and the first gear again, which reduces the difficulty of operation and improves the switching efficiency.

[0012] Furthermore, the input shaft has a connecting key extending in the axial direction, and the input gear has a connecting groove cooperating with the connecting key.

[0013] Furthermore, the input shaft or the output shaft has a coaxially arranged core hole, and the output shaft or the input shaft has a coaxially arranged core shaft, and the core shaft is inserted into the core hole in a relatively rotatable manner.

[0014] Furthermore, the elastic member is a spring sleeved on the input shaft and the output shaft, and two ends of the spring are respectively abutted between the input gear and the output gear.

[0015] Furthermore, the output gear has a coaxially arranged thrust bearing on a side facing the input gear, and both ends of the spring are respectively abutted between the input gear and the thrust bearing.

[0016] A micro-tiller comprises an axle passing through a travel box, wherein a gearbox as described above is provided at each end of the axle, and the two gearbox housings are mounted on a machine body via at least one crossbeam; the input shaft of the gearbox is coaxially connected to the axle, and the output shaft is coaxially connected to the wheel.

[0017] With the above structure, the two gearboxes are respectively arranged at the two ends of the wheel axle through a crossbeam. The two ends of the wheel axle are coaxially connected to the input shafts of the two gearboxes and are connected to the wheels through the output shaft. In this way, when the power output of one of the gearboxes is disconnected, the micro-tiller can turn on the spot, thereby reducing the difficulty of operation.

[0018] In summary, the gearbox and the micro-tillage machine of the present invention have the advantages of reasonable structural design, low operating difficulty, and are conducive to reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of the box in this embodiment.

[0020] Figure 2 A schematic diagram of the structure inside the box.

[0021] Figure 3 This is a structural diagram of the input gear and the first gear being disconnected.

[0022] Figure 4 Schematic diagram of the overall structure of the drive shaft group.

[0023] Figure 5 for Figure 4 Schematic diagram of the decomposition structure.

[0024] Figure 6 Schematic diagram of the input gear structure. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the embodiments.

[0026] When implementing: Figures 1-6As shown, a micro-tiller comprises an axle passing through a travel box, a gearbox is provided at each end of the axle, and the two gearbox boxes are mounted on the machine body through at least one crossbeam; the gearbox comprises a box body 1, wherein a drive shaft group 2 and a countershaft 3 are arranged in parallel, the drive shaft group 2 comprises an input shaft 21 for connecting to the agricultural machinery axle and an output shaft 22 for connecting to the wheel, the input shaft 21 and the output shaft 22 are coaxially arranged on the box body 1 so as to be rotatable relative to each other; the input shaft 21 is provided with an axially movable input gear 5, and the output shaft 22 is provided with an output gear 4; the countershaft 3 has a first gear 31 and a second gear 32 respectively meshed with the input gear 5 and the output gear 4; the input gear 5 has a fork groove, and the box body 1 is provided with a fork mechanism (not shown in the figure) for driving the input gear 5 to move axially, so that the input gear 5 can be switched between the input shaft 21 and the first gear 31 to a transmission connection state or a transmission disconnection state. In order to enable the input gear 5 to achieve power connection between the input shaft 21 and the first gear 31 in the default state, an elastic member 6 is provided on the input shaft 21, and one end of the elastic member 6 abuts against the input gear 5, so that the input gear 5 is in a transmission connection state between the input shaft 21 and the first gear 31.

[0027] Specifically, in this embodiment, to enable the input gear 5 to switch between the input shaft 21 and the first gear 31 to a transmission connected state or a transmission disconnected state, the following structure is adopted: the input gear 5 is relatively rotatably sleeved on the input shaft 21, the input shaft 21 has a protruding synchronization disk 7, a separable coupling mechanism 8 is provided between the synchronization disk 7 and the side opposite the input gear 5, and the elastic member 6 is located on the side of the input gear 5 facing away from the synchronization disk 7. The coupling mechanism 8 includes coupling grooves 81 uniformly distributed along the circumference of the synchronization disk 7, and coupling blocks 82 protruding from the input gear 5 and capable of being inserted into the coupling grooves 81. In this embodiment, three coupling grooves 81 and three coupling blocks 82 are uniformly distributed along the circumference.

[0028] The shift fork mechanism pushes the input gear 5 toward the elastic member 6, compressing the elastic member 6 and allowing the coupling block 82 to disengage from the coupling groove 81. Since the input gear 5 and the input shaft 21 can rotate relative to each other, the power connection between the input shaft 21 and the input gear 5 is now severed. Regardless of whether the input gear 5 is in meshing with the first gear 31, the input shaft 21 and the first gear 31 are also in a transmission disconnected state. After the shift fork mechanism is released, the input gear 5, under the action of the elastic member 6, moves toward the synchronizing plate 7. At this time, the input shaft 21 and the input gear 5 rotate relative to each other due to the speed difference. When the coupling block 82 is aligned with the coupling groove 81, the two engage under the thrust of the elastic member 6. Power is transmitted to the first gear 31 via the input shaft 21, the coupling mechanism 8, and the input gear 5, and the input shaft 21 and the first gear 31 are in a transmission connection state.

[0029] Because this embodiment connects and disconnects power via the coupling groove 81 and coupling block 82, to minimize coupling difficulty and improve operational efficiency, the input gear 5 and the first gear 31 remain in meshing engagement both when the coupling groove 81 and coupling block 82 are engaged and disengaged. In other words, the input gear 5 and the first gear 31 remain meshed throughout the shift fork mechanism's operating stroke. As the elastic member 6 pushes the input gear 5 toward the synchronizing disk 7, the two gears do not need to re-engage; only the coupling groove 81 and coupling block 82 need to be engaged. This significantly reduces coupling difficulty, avoids collision between the input gear and the first gear caused by re-engagement, and helps extend the service life of the input gear and the first gear.

[0030] In this embodiment, the output shaft 22 has a coaxially arranged core hole 23, and the input shaft 21 has a coaxially arranged core shaft 24. The core shaft 24 can be relatively rotatably inserted in the core hole 23. In order to allow the core shaft 24 to rotate more smoothly in the core hole 23, a bearing 25 is provided between the core shaft 24 and the core hole 23.

[0031] The elastic member 6 is a spring mounted on the shaft between the input gear 5 and the output gear 4, with both ends of the spring abutting between the input gear 5 and the output gear 4. Since the input gear 5 and the output gear 4 rotate at different speeds, to prevent friction between the two ends of the spring and the input gear 5 or the output gear 4 due to the speed differences, the output gear 4 has a coaxial thrust bearing 9 on the side facing the input gear 5, with both ends of the spring abutting between the input gear 5 and the thrust bearing 9.

[0032] In the embodiment, the cross beam is made of a square tube, the box body is provided with a square hole corresponding to the square tube, the square hole is provided through along the axial direction of the input shaft 21, and the two ends of the square tube are arranged on the square hole of the box body and are fixedly connected through bolts. Meanwhile, the wheel shaft is a hexagonal prism, the outer ends of the input shaft 21 and the output shaft 22 are provided with the hexagonal prism consistent with the wheel shaft, the two ends of the wheel shaft are connected to the input shaft 21 of the two gearboxes through the connecting sleeves with hexagonal through holes, and the outer end of the output shaft 22 is connected to the wheel shaft of the wheel through the connecting sleeve.

[0033] With the above structure, one gearbox is arranged at each end of the wheel shaft of the walking box, the wheel shaft is connected with the input shaft of the gearbox, and the wheels are connected with the output shafts of the two gearboxes respectively; the input gear of one of the gearboxes is moved to the state that the input shaft is in transmission connection with the first gear through the shift fork mechanism, after power is transmitted into the input shaft, the power is transmitted to the countershaft through the meshing first gear, and then the power is transmitted to the output shaft through the meshing output gear on the countershaft. The input gear of the other gearbox is moved to the state that the input shaft is in transmission disconnection with the first gear through the shift fork mechanism, so that the power output of the input shaft is cut off, and the agricultural machine can complete the steering under the speed difference of the wheels on both sides, thereby greatly reducing the difficulty of steering operation, reducing the labor intensity of the operator and improving the farming efficiency.

[0034] In addition, in specific implementation, to realize that the input gear 5 can be switched to the transmission connection state or the transmission disconnection state between the input shaft 21 and the first gear 31, the following structure can also be adopted: the input shaft 21 is provided with a connecting key, such as an external spline and a convex rib, which is arranged in the axial direction, and the input gear 5 is provided with a connecting groove, such as an internal spline, which is arranged in cooperation with the connecting key, so that the input gear 5 can be moved along the input shaft 21, and the transmission connection between the input shaft 21 and the input gear 5 can be ensured, the shift fork mechanism pushes the input gear 5 to move in the axial direction, and the input gear 5 is switched between the meshing state and the disengagement state with the first gear 31.

[0035] The above only describes preferred embodiments of the utility model, and the utility model is not limited, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A gearbox for steering, characterized in that: The invention comprises a housing (1), wherein a drive shaft group (2) and a countershaft (3) are arranged in parallel in the housing (1), wherein the drive shaft group (2) comprises an input shaft (21) for connecting to an agricultural machinery wheel shaft and an output shaft (22) for connecting to a wheel, wherein the input shaft (21) and the output shaft (22) are coaxially arranged on the housing (1) and can rotate relative to each other; an axially movable input gear (5) is provided on the input shaft (21), and an output gear (4) is provided on the output shaft (22); a first gear (31) and a second gear (32) are respectively meshed with the input gear (5) and the output gear (4) on the countershaft (3); and a shift fork mechanism for driving the input gear (5) to move axially is provided on the housing (1), so that the input gear (5) can be switched between the input shaft (21) and the first gear (31) to a transmission connection state or a transmission disconnection state.

2. The gearbox for steering according to claim 1, characterized in that An elastic member (6) is provided on the input shaft (21), and one end of the elastic member (6) abuts against the input gear (5), so that the input gear (5) is in a transmission connection state between the input shaft (21) and the first gear (31).

3. The gearbox for steering according to claim 2, characterized in that: The input gear (5) is relatively rotatably sleeved on the input shaft (21); a protruding synchronous disc (7) is provided on the input shaft (21); a detachable coupling mechanism (8) is provided between the synchronous disc (7) and a side opposite to the input gear (5); and the elastic member (6) is located on a side of the input gear (5) facing away from the synchronous disc (7).

4. The gearbox for steering according to claim 3, characterized in that: The coupling mechanism (8) comprises coupling grooves (81) uniformly distributed along the circumferential direction on the synchronization disk (7) or the input gear (5), and coupling blocks (82) protruding from the input gear (5) or the synchronization disk (7) and capable of being embedded in the coupling grooves (81).

5. The gearbox for steering according to claim 4, characterized in that: The input gear (5) and the first gear (31) are in a meshing state when the coupling groove (81) and the coupling block (82) are coupled or disengaged.

6. The gearbox for steering according to claim 2, characterized in that: The input shaft (21) has a connecting key extending in the axial direction, and the input gear (5) has a connecting groove cooperating with the connecting key.

7. The gearbox for steering according to any one of claims 2 to 6, characterized in that: The input shaft (21) or the output shaft (22) has a coaxially arranged core hole (23), and the output shaft (22) or the input shaft (21) has a coaxially arranged core shaft (24), and the core shaft (24) is relatively rotatably inserted into the core hole (23).

8. The gearbox for steering according to claim 7, characterized in that: The elastic member (6) is a spring sleeved on the input shaft (21) and / or the output shaft (22), with both ends of the spring respectively abutting between the input gear (5) and the output gear (4).

9. The gearbox for steering according to claim 8, characterized in that: The output gear (4) has a coaxially arranged thrust bearing (9) on the side facing the input gear (5), and both ends of the spring are respectively abutted between the input gear (5) and the thrust bearing (9).

10. A micro-tillage machine, characterized in that: The invention comprises a wheel axle passing through a traveling box, wherein a gearbox according to any one of claims 1 to 9 is provided at each end of the wheel axle, and the housings of the two gearboxes are mounted on the machine body through at least one crossbeam; the input shaft (21) of the gearbox is coaxially connected to the wheel axle, and the output shaft (22) is coaxially connected to the wheel.

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