Gear shifting device of four-wheel-drive mini-tiller

Abstract

The utility model relates to the technical field of agricultural machinery equipment, in particular to a gear shifting device of a four-wheel-drive mini-tiller, which can be used for conveniently adjusting the heights of a handrail arm and a gear shifting mechanism by improving the positions of each connecting rod and the handrail arm of the gear shifting mechanism, and is more practical. Comprising a supporting seat and two armrest arms arranged on the supporting seat, the bottom of the supporting seat is fixedly arranged on a gearbox body of the four-wheel-drive mini-tiller, the two armrest arms are symmetrically arranged on the two sides of the upper end of the supporting seat, one ends of the two armrest arms are hinged to the supporting seat, and the other ends of the two armrest arms are connected through a supporting rod; a first mounting seat is fixedly arranged on the supporting rod, a gear shifting rod is rotationally connected to the first mounting seat, and a first connecting rod is rotationally connected to the gear shifting rod; and a second mounting seat is arranged on the supporting seat, a second connecting rod is rotationally connected to the second mounting seat, one end of the second connecting rod is rotationally connected with the other end of the first connecting rod, and the other end of the second connecting rod is rotationally connected with a gear shifting arm.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery equipment technology, specifically to a gear shifting device for a four-wheel drive micro-tiller. Background Technology

[0002] A mini tiller is a small tillage machine suitable for hilly and mountainous terrains where large and medium-sized agricultural machinery cannot be used. It is mainly powered by small diesel and gasoline engines. The tillage blade assembly is driven by the transmission system to till the land. The four-wheel drive mini tiller is a type of mini tiller. Its engine and gearbox are directly connected, which will not cause slippage on hard ground and make its performance more stable.

[0003] The four-wheel drive mini-tiller differs from existing mini-tillers in that it has more gears and can adapt to more terrain conditions. The gear shifting structure is also different. For example, application number CN202121689820.8 discloses a gear shifting mechanism for a mini-tiller, which includes a protective cover, a control lever, a first shift lever, a second shift lever, a shift support rod, and a shift arm. The first shift lever, the second shift lever, and the limiting groove on the protective cover work together to reduce misoperation.

[0004] However, in actual use, the height of users of four-wheel drive mini-tillers varies, and the optimal operating height of the control lever also differs. Existing mini-tiller shifting mechanisms either cannot adjust the height of the control lever or are too complicated to adjust. At the same time, although each shift lever and control lever is matched with a fixed function, which can avoid the problem of mismatch between function and gear during actual operation, the large number of shift levers increases the learning cost for the operator and also affects the convenience of operation. Utility Model Content

[0005] I. Technical problems to be solved

[0006] This utility model addresses the shortcomings of existing technologies by proposing a gear shifting device for a four-wheel drive micro-tiller. By improving the positions of the various linkages and the handlebars of the gear shifting mechanism, the height of the handlebars and the gear shifting mechanism can be easily adjusted, making it more practical.

[0007] II. Specific Technical Solutions

[0008] A shifting device for a four-wheel drive mini-tiller includes a support base and arm handles mounted on the support base. The bottom of the support base is fixedly mounted on the gearbox body of the four-wheel drive mini-tiller. Two arm handles are symmetrically mounted on both sides of the upper end of the support base. One end of each arm handle is hinged to the support base, and the other ends are connected via a support rod. A first mounting seat is fixedly mounted on the support rod, and a shift lever is rotatably connected to the first mounting seat. A first connecting rod is rotatably connected to the shift lever. A second mounting seat is mounted on the support base, and a second connecting rod is rotatably connected to the second mounting seat. One end of the second connecting rod is rotatably connected to the other end of the first connecting rod, and the other end of the second connecting rod is rotatably connected to a shift arm.

[0009] Implementation principle and working principle:

[0010] In this design, the structural strength of the armrest arm is enhanced by the support rod. When adjusting gears, simply moving the end of the shift lever applies force to the second link via the first link, causing the upper end of the second link to rotate clockwise or counterclockwise. The lower end of the second link also rotates, pushing the shift arm to perform the gear shifting operation. When adjusting the height of the armrest arm, only the angle between the armrest arm and the support base needs to be adjusted. Since the shift lever and the first link are hinged to other parts, the correspondence between each position of the shift lever and the gear is not affected, making adjustment more convenient.

[0011] Preferably, the handlebar is also provided with a mounting plate, the two ends of which are respectively connected to the corresponding handlebar. The mounting plate is provided with movable holes for the handlebar, and the edges of the movable holes are provided with gear markings. The beneficial effect of this preferred embodiment is that, by setting up the mounting plate, it can protect the operator when the micro-tiller experiences backlash, and can also prevent dust raised during tilling from affecting the operator. The setting of the movable holes and gear markings ensures smooth movement of the gear shift lever while ensuring accurate gear selection, thus increasing the safety factor.

[0012] Preferably, both ends of the first link are bent upwards to form mounting portions, the ends of which are used to connect with the shift lever and the second link; the middle of the second link is bent towards the armrest. The advantage of this preferred embodiment is that the bending of the first link facilitates installation and also helps in the transmission of force, while the bending of the second link allows for miniaturization and leaves sufficient space for the movement of the shift arm.

[0013] Preferably, a force-applying arm is provided on the outer side of the gearbox body, one end of the force-applying arm is rotatably connected to the gearbox body, and the other end of the force-applying arm is rotatably connected to the other end of the shift arm. An arc-shaped limiting hole is also provided in the middle of the force-applying arm. The gearbox body is provided with a shift fork, and the shift fork rod of the shift fork is provided in the arc-shaped limiting hole and can move along the arc-shaped limiting hole. The beneficial effect of this preferred embodiment is that when shifting gears, the shift arm will drive the force-applying arm to rotate, which in turn drives the shift fork rod to rotate, which in turn drives the shift fork of the gearbox body to move to achieve shifting.

[0014] Preferably, the middle part of the lever arm is provided with a limiting support hole, one end of which is connected to the arc-shaped limiting hole, and the other end of which is located away from the gear shift lever. The beneficial effect of this preferred embodiment is that the limiting support hole can provide limiting space for reverse gear or other gears that are prone to causing risks, prevent misoperation, and better improve safety performance.

[0015] Preferably, the length of the shift arm is adjustable; a locking mechanism is also provided at the connection between the armrest and the first mounting base, the locking mechanism being used to lock and adjust the mounting angle of the armrest on the first mounting base; the beneficial effect of this preferred embodiment is that the shift arm with adjustable length can effectively reduce the assembly difficulty and adjustment difficulty, and the setting of the locking mechanism can further reduce the adjustment difficulty of the armrest.

[0016] The beneficial effects of this utility model are as follows:

[0017] When adjusting the height of the handrail, only the angle between the handrail and the support base needs to be adjusted. Since the shift lever and the first linkage are all hinged to other parts, it will not affect the correspondence between each position of the shift lever and the gear, making the adjustment more convenient. The arc-shaped limit hole and limit support hole can provide limit space for reverse gear or other gears that are prone to risk, preventing misoperation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the four-wheel drive mini-tiller in this embodiment.

[0019] Figure 2 This is a schematic diagram of the gearbox body in this embodiment.

[0020] Figure 3 This is an isometric view of the shifting mechanism in this embodiment.

[0021] Figure 4 This is a side view of the gear shifting mechanism in this embodiment.

[0022] Explanation of reference numerals in the attached drawings: 1. Support base; 2. Handrail; 3. Gearbox body; 4. Support rod; 5. First mounting base; 6. Shift lever; 7. First connecting rod; 8. Second mounting base; 9. Second connecting rod; 10. Shift arm; 11. Mounting plate; 12. Movable hole; 13. Gear position scale; 14. Mounting part; 15. Force arm; 16. Arc-shaped limiting hole; 17. Shift fork rod; 18. Limiting support hole; 19. Locking mechanism. Detailed Implementation

[0023] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] like Figure 1-4 As shown:

[0025] A shifting device for a four-wheel drive micro-tiller includes a support base 1, a handlebar arm 2, and a gearbox body 3. The gearbox body 3 is a shift fork gearbox. The bottom of the support base 1 is detachably mounted on the top of the gearbox body 3 by bolts, or it can be connected and fixed by welding. There are two handlebar arms 2, which are symmetrically arranged on both sides of the upper end of the support base 1. Specifically, the lower ends of the two handlebar arms 2 are rotatably connected to the upper end of the support base 1 by hinges, and the upper ends of the two handlebar arms 2 are connected by support rods 4. The two ends of the support rods 4 are respectively connected to the two handlebar arms 2 by welding. The setting of the support rods 4 can improve the structural strength of the handlebar arms 2.

[0026] Specifically, a first mounting base 5 is welded or integrally formed on the support rod 4. The bottom of the first mounting base 5 is pivotally or hinged to the bottom of the shift lever 6, and the middle part of the shift lever 6 is hinged to the upper end of the first connecting rod 7. Specifically, a second mounting base 8 is located on the bottom side of the upper end of the support base 1, and a second connecting rod 9 is hinged to the second mounting base 8, specifically hinged to the middle part of the second connecting rod 9. The upper end of the second connecting rod 9 is hinged to the bottom end of the first connecting rod 7, and a shift arm 10 is hinged to the bottom end of the second connecting rod 9. In actual operation... When adjusting the height of the armrest 2, only the angle between the armrest 2 and the support base 1 needs to be adjusted. Since the shift lever 6 and the first link 7 are all hinged to other parts, there is no need to match every position of the shift lever 6 with the gear, making the adjustment more convenient. When actually adjusting the gear, only the end of the shift lever 6 needs to be moved, which will apply force to the second link 9 through the first link 7, causing the upper end of the second link 9 to rotate clockwise or counterclockwise. The lower end of the second link 9 will also rotate, which will push the shift arm 10 to shift gears.

[0027] In implementation, a mounting plate 11 is also provided on the handle arm 2. The two ends of the mounting plate 11 are fixedly connected to the handle arms 2 on both sides by welding or bolts. An movable hole 12 is provided in the width direction of the mounting plate 11, which facilitates the movement of the handle arm 2. The edge of the movable hole 12 is provided with a gear position scale 13. Specifically, the mounting plate 11 can protect the operator when the micro tiller recoils, and can also prevent the dust kicked up during tilling from affecting the operator. The movable hole 12 and the gear position scale 13 ensure smooth movement of the gear shift lever 6 and accurate gear position, thus increasing the safety factor.

[0028] In practice, the two ends of the first link 7 are bent upwards to form the mounting part 14, and the end of the mounting part 14 is used to connect with the shift lever 6 and the second link 9. Specifically, the middle part of the second link 9 is bent towards the side where the armrest 2 is located. The advantage of this is that the bending of the first link 7 facilitates installation and also helps with the transmission of force. The bending of the second link 9 can leave sufficient space for the movement of the shift arm 10 while miniaturizing the size.

[0029] In implementation, a lever arm 15 is provided on the outer side of the gearbox body 3. One end of the lever arm 15 is rotatably connected to the gearbox housing 3, and the other end of the lever arm 15 is rotatably connected to the other end of the shift arm 10. An arc-shaped limiting hole 16 is also provided in the middle of the lever arm 15. The shift fork rod 17 of the gearbox body 3 is located in the arc-shaped limiting hole 16 and can move along the arc-shaped limiting hole 16. When shifting gears, the shift arm 10 will drive the lever arm to rotate, which in turn drives the shift fork rod 17 to rotate, which in turn drives the shift fork of the gearbox body 3 to move to achieve gear shifting. Furthermore, in order to better improve safety performance, a limiting support hole 18 is also provided in the middle of the lever arm 15. One end of the limiting support hole 18 is connected to the arc-shaped limiting hole 16, and the other end of the limiting support hole 18 is located at the end away from the shift lever 6. The limiting support hole 18 can provide limiting space for reverse gear or other gears that are prone to risk, preventing misoperation.

[0030] In practice, the length of the shift arm 10 is adjustable. Specifically, the shift arm 10 includes a left connecting end and a right connecting end. The side of the left connecting end closest to the right connecting end is a threaded rod. The left end of the right connecting section has a mating hole, and the right connecting end and the left connecting section are locked and positioned by two fixing nuts. The length of the shift arm 10 can be adjusted by adjusting the locking nuts, making it more versatile and easier to assemble and adjust. A locking mechanism 19 is also provided at the connection between the armrest 2 and the first mounting base 5. In this embodiment, the locking mechanism 10 is specifically a locking screw. By tightening and loosening the locking screw, the armrest 2 can be tightened and loosened, which facilitates the locking and adjustment of the mounting angle of the armrest 2 on the first mounting base 5.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims.

Claims

1. A four-wheel micro-cultivator gear shifting device, comprising a support seat (1) and a handrail arm (2) arranged on the support seat (1), the bottom of the support seat (1) is fixedly arranged on a gearbox body (3) of a four-wheel micro-cultivator, and the handrail arm (2) is arranged on both sides of the upper end of the support seat (1) and is symmetrical, characterized in that: Two armrest arms (2) are hinged at one end on the support seat (1), and the other end of the two armrest arms (2) is connected through a support rod (4); a first mounting seat (5) is fixedly arranged on the support rod (4), a shift lever (6) is rotatably connected on the first mounting seat (5), and a first connecting rod (7) is rotatably connected on the shift lever (6); a second mounting seat (8) is arranged on the support seat (1), a second connecting rod (9) is rotatably connected on the second mounting seat (8), one end of the second connecting rod (9) is rotatably connected with the other end of the first connecting rod (7), and a shift arm (10) is rotatably connected at the other end of the second connecting rod (9).

2. The four-wheel micro-tractor shifting device according to claim 1, characterized in that: An installation plate (11) is further arranged on the armrest arm (2), both ends of the installation plate (11) are connected on the corresponding armrest arm (2) respectively, a movable hole (12) of the armrest arm (2) is arranged on the installation plate (11), and a gear position scale (13) is arranged on the edge of the movable hole (12).

3. The four-wheel micro-tractor gear shifting device according to claim 1, characterized in that: Both ends of the first connecting rod (7) are upwardly bent to form installation portions (14), and the end portions of the installation portions (14) are used for being connected with the shift lever (6) and the second connecting rod (9); the middle portion of the second connecting rod (9) is bent towards the armrest arm (2) side.

4. The four-wheel micro-tractor shifting device according to claim 1, characterized in that: A force applying arm (15) is arranged outside the gearbox body (3), one end of the force applying arm (15) is rotatably connected on the gearbox body (3), the other end of the force applying arm (15) is rotatably connected with the other end of the shift arm (10), the middle portion of the force applying arm (15) is further provided with an arc-shaped limiting hole (16), the gearbox body (3) is provided with a shift fork, and a shift fork rod (17) of the shift fork is arranged in the arc-shaped limiting hole (16) and can move along the arc-shaped limiting hole (16).

5. The four-wheel micro-tractor gear shifting device according to claim 4, characterized in that: The middle portion of the force applying arm (15) is further provided with a limiting branch hole (18), one end of the limiting branch hole (18) is connected with the arc-shaped limiting hole (16), and the other end of the limiting branch hole (18) is located away from the end where the shift lever (6) is located.

6. The four-wheel micro-tractor gear shifting device according to claim 4, characterized in that: The length of the shift arm (10) is adjustable; a locking mechanism (19) is further arranged at the connection between the armrest arm (2) and the first mounting seat (5), and the locking mechanism (19) is used for locking and adjusting the installation angle of the armrest arm (2) on the first mounting seat (5).

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