Connecting structure for frame and transmission case of small agricultural machine
By introducing a connection structure between an adjustment plate and a mounting plate into small agricultural machinery, and using guide holes and guide bolts to achieve a stable connection between the transmission box and the frame, the problems of unstable driving of small agricultural machinery on undulating roads and easy breakage at the connection point are solved, thereby improving stability and connection life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JUNAN COUNTY YISHENGDA MACHINERY FACTORY
- Filing Date
- 2025-06-24
- Publication Date
- 2026-05-05
AI Technical Summary
In existing small agricultural machinery, the rigid connection between the rear frame and the transmission box results in poor stability when driving on undulating working surfaces and the connection is prone to breakage.
The system employs a connection structure between an adjustment plate and a mounting plate. Through the design of guide holes and guide bolts, the transmission box and frame remain stable on undulating roads. The rear wheels adaptively adjust to buffer road undulations, and the use of guide bolts and shims reduces friction loss and pressure at the connection points.
It improves the driving stability of small agricultural machinery on undulating roads, extends the service life of the connection structure, and reduces the risk of breakage at the connection.
Smart Images
Figure CN224197592U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of small agricultural machinery technology, specifically to a connection structure between the frame and transmission box of a small agricultural machinery. Background Technology
[0002] Small agricultural machinery refers to small-scale agricultural production tools that are lightweight, low-cost, and highly adaptable. They are primarily suitable for family farms, cooperatives, and small-scale agricultural production. Their core characteristics are small size, light weight, flexible operation, and economic practicality. The application of small agricultural machinery fills gaps in operational scenarios that large machinery cannot cover, promoting the development of mountain economies and precision agriculture.
[0003] The small agricultural machinery involved in this utility model is mainly used for traction operations. It primarily comprises a front frame and a rear frame articulated together. An engine mount is installed on the front side of the front frame, and a transmission box is installed on the rear side of the rear frame. The engine transmits power to a drive shaft, which passes through the front and rear frames and transmits power to a gear set within the transmission box. This power then drives the rear wheels to rotate via a shaft at the output end of the transmission box. A steering wheel is installed on the top of the front frame. Turning the steering wheel moves a lever, which in turn causes the rear frame to swing, thus changing the direction of the agricultural machinery. Traction devices for towing other agricultural implements are installed at the front of the engine mount or the rear of the transmission box. Tools such as plows can be mounted at the front or rear of the small agricultural machinery, allowing for plowing and soil turning through traction.
[0004] In the aforementioned existing small agricultural machinery, the connection between the rear frame and the transmission box is often rigidly connected by nuts and bolts. This rigid connection between the rear frame and the rear axle makes the small agricultural machinery unable to counteract the effects of uneven working surfaces. For example, when the front wheel of the small agricultural machinery passes over a raised working surface, the frame will tilt due to the raised surface. Since the connection between the rear axle and the frame is rigid, this will cause the rear wheel to tilt, resulting in one rear wheel being suspended in the air, making the machinery less stable. In addition, due to the weight of the rear axle itself, when the front wheel passes over a raised working surface, a large force will be generated at the connection between the frame and the transmission box. Long-term operation on such uneven working surfaces will reduce the service life of the fixing bolts, making the connection between the frame and the rear axle more prone to breakage, affecting the normal use of the small agricultural machinery. Utility Model Content
[0005] To address the aforementioned problems, this utility model provides a connection structure between the frame and transmission box of a small agricultural machine, thereby solving the problem that the rigid connection between the frame and transmission box in the prior art results in poor stability of the agricultural machine when working on undulating working surfaces and easy breakage at the connection point.
[0006] This utility model is achieved using the following technical solution: a connection structure between a small agricultural machinery frame and a transmission box, comprising a frame and a transmission box installed at the rear end of the frame, characterized in that an adjustment plate is fixedly connected to the input end of the transmission box, and a mounting plate is fixedly connected to the rear end of the frame; both the mounting plate and the adjustment plate have through holes in their middle portions for the drive shaft to pass through; the mounting plate has several arc-shaped guide holes around the through holes, the centers of the circles corresponding to the guide holes being located at the same point; the adjustment plate has threaded holes, and guide bolts that slide with the guide holes are fixedly installed on the threaded holes by threaded connections, the heads of the guide bolts being located on the front side of the mounting plate and unable to pass through the guide holes.
[0007] The aforementioned structure ensures that the small agricultural machine in this invention maintains four-wheel contact with the ground when traversing uneven roads, thereby guaranteeing its stability during use. The guide holes and guide bolts allow the rear wheels to adaptively adjust and cushion the impact of road surface undulations without affecting normal traction and drive of the rear axle. Furthermore, this connection structure reduces the risk of breakage at the connection points, extending the service life of the connection structure.
[0008] Preferably, a washer is provided between the head of the guide bolt and the mounting plate, and the washer is fitted onto the thread of the guide bolt. The washer effectively reduces frictional wear between the guide bolt and the mounting plate, increasing the service life of the connection structure in this invention.
[0009] Preferably, four guide holes are provided, arranged in a circular array, and four guide bolts are provided, with each guide bolt corresponding to one of the guide holes. This one-to-one correspondence between the four guide holes and four guide bolts ensures more uniform stress distribution in the connection structure, further increasing its stability.
[0010] Preferably, the frame includes a front frame, with a rear frame hinged to the rear end of the front frame, and a mounting plate fixedly connected to the rear end of the rear frame; both the front and rear frames are hollow structures. The hinged connection between the front and rear frames makes the small agricultural machinery of this invention easier to steer.
[0011] Preferably, the upper and lower sides of the front of the rear frame are fixedly connected to first hinge plates, and the top and bottom of the rear of the front frame are fixedly connected to second hinge plates, with the first hinge plates hinged to their corresponding second hinge plates. The arrangement of the first and second hinge plates facilitates the hinge connection between the front and rear frames.
[0012] Preferably, both the first and second hinge plates are provided with hinge holes. A mounting block is fixedly connected to the side of the first hinge plate away from the second hinge plate. The mounting block has a mounting hole with a diameter larger than the hinge hole. The head of a limiting bolt is fitted into the mounting hole, but the head of the limiting bolt cannot pass through the hinge hole. The screw of the limiting bolt passes through the first and second hinge plates and extends to the side of the second hinge plate away from the first hinge plate. A limiting nut is installed at the end of the limiting bolt away from the first hinge plate through a threaded engagement. The limiting bolt rotates with the first and second hinge plates. By setting the limiting nut, the limiting bolt can be prevented from disengaging from the first and second hinge plates, ensuring the stability of the hinge connection between the front frame and the rear frame.
[0013] Preferably, a mounting base is fixedly connected to the front side of the transmission box, and the mounting base has several fixing holes. Several threaded posts corresponding to the fixing holes are fixedly connected to the rear side of the adjusting plate. After passing through the fixing holes, the threaded posts are fixedly connected to fixing nuts through threaded engagement. The drive shaft passes through the mounting base and rotates with the mounting base. The installation of the transmission box is more convenient due to the mounting base.
[0014] Preferably, a support frame is fixedly connected to the top of the front frame, and the front end of a suspension frame is fixedly connected to the top of the support frame. The rear end of the suspension frame is suspended, and a seat is fixedly installed on the suspension frame. The suspension frame design makes it easier to install the seat, avoiding the difficulties in seat installation caused by space limitations in small agricultural machinery.
[0015] In summary, the beneficial effects of this utility model are as follows: the transmission box is connected to the frame by cooperating with the adjusting plate and the mounting plate. The mounting plate has a circumferential array of guide holes, and the adjusting plate is also connected with guide bolts that slide with the adjusting holes. This allows the front axle to tilt the frame and the mounting plate to tilt when the front wheels of the small agricultural machine travel over uneven surfaces, while the adjusting plate remains stable. The transmission box does not tilt, and the rear wheels remain in contact with the road surface to ensure driving stability. When the rear wheels travel over uneven surfaces, only the transmission box is adjusted by rotating the adjusting plate, without affecting the front wheels, thus increasing the stability of the agricultural machine during operation. Furthermore, this connection structure reduces the force on the connection point, decreasing the likelihood of breakage at the connection between the transmission box and the frame, increasing the service life of the structure, and further improving the stability of the agricultural machine during operation. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of a small agricultural machine;
[0017] Figure 2 This is a schematic diagram of the connection structure between the vehicle frame and the transmission box in this utility model;
[0018] Figure 3 This is a schematic diagram of the fit between the rear frame and the adjustment plate.
[0019] Figure 4 This is a schematic diagram of the connection between the rear frame and the adjustment plate.
[0020] Figure 5 This is a structural diagram of the rear frame;
[0021] Figure 6 This is a schematic diagram of the adjustment plate.
[0022] In the diagram: 1-Front frame; 2-Rear frame; 3-Transmission box; 4-Support frame; 5-Seat; 6-Adjusting plate; 7-Mounting plate; 8-Shaft; 9-Mounting seat; 10-First hinge plate; 11-Mounting block; 12-Limit bolt; 13-Second hinge plate; 14-Limit nut; 15-Fixing nut; 16-Threaded hole; 17-Guide hole; 18-Washer; 19-Guide bolt; 20-Frame; 21-Threaded post; 22-Suspension frame; 23-Rear wheel. Detailed Implementation
[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0024] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0025] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.
[0026] like Figure 1 , Figure 2 , Figure 3As shown, the vehicle includes a frame and a transmission box 3 mounted at the rear end of the frame. The output end of the transmission box 3 is rotatably mounted with a shaft 8 for driving the rear wheel. The input end of the transmission box 3 is fixedly connected to an adjustment plate 6. The rear end of the frame is fixedly connected to a mounting plate 7. Both the mounting plate 7 and the adjustment plate 6 have through holes in the middle for the drive shaft to pass through. The mounting plate 7 has several arc-shaped guide holes 17 around the through holes. The centers of the circles corresponding to the arcs of the guide holes 17 are located at the same point. The adjustment plate 6 has threaded holes 16. Guide bolts 19 that slide with the guide holes 17 are fixedly mounted on the threaded holes 16 by threaded connection. The heads of the guide bolts 19 are located on the front side of the mounting plate 7 and cannot pass through the guide holes 17.
[0027] In this utility model, a frame 20 for mounting the engine is fixedly installed at the front of the small and medium-sized agricultural machinery frame. When the agricultural machinery needs to move forward, the engine transmits power to the transmission box 3 through the drive shaft. The output end of the transmission box 3 drives the rear wheel 23 to rotate through the rotating shaft 8. At this time, the adjusting plate 6 will push the mounting plate 7, thereby realizing the overall forward movement of the vehicle. When the agricultural machinery needs to move backward, the head of the guide bolt 19 abuts against the mounting plate 7, pulling the frame backward together, thus realizing the overall backward movement of the agricultural machinery.
[0028] To reduce friction between the head of the guide bolt 19 and the mounting plate 7, a washer 18 is placed between the head of the guide bolt 19 and the mounting plate 7, and the washer 18 is fitted onto the thread of the guide bolt 19. Furthermore, since the frame is mainly pulled by the head of the guide bolt 19 when the agricultural machinery is reversing, the washer 18 helps to evenly distribute pressure and prevent excessive local pressure from causing deformation of parts.
[0029] In this embodiment, there are four guide holes 17 arranged in a circular array, and four guide bolts 19 are provided, with each guide bolt 19 corresponding to one of the guide holes 17.
[0030] The vehicle frame of this utility model includes a front frame 1, and a rear frame 2 is hinged to the rear end of the front frame 1. The mounting plate 7 is fixedly connected to the rear end of the rear frame 2. Specifically, the upper and lower sides of the front of the rear frame 2 are fixedly connected to a first hinge plate 10, and the top and bottom of the rear end of the front frame 1 are fixedly connected to a second hinge plate 13. The upper first hinge plate 10 is hinged to the upper second hinge plate 13, and the lower first hinge plate 10 is hinged to the lower second hinge plate 13. The upper and lower pairs of hinge holes are coaxial.
[0031] Both the first hinge plate 10 and the second hinge plate 13 have hinge holes. A mounting block 11 is fixedly connected to the side of the first hinge plate 10 away from the second hinge plate 13. The mounting block 11 has a mounting hole with a diameter larger than the hinge hole. The head of the limiting bolt 12 is fitted into the mounting hole. The head of the limiting bolt 12 cannot pass through the hinge hole. The screw of the limiting bolt 12 passes through the first hinge plate 10 and the second hinge plate 13 and extends to the side of the second hinge plate 13 away from the first hinge plate 10. A limiting nut 14 is installed at the end of the limiting bolt 12 away from the first hinge plate 10 through a threaded engagement. The limiting bolt 12 is rotatably engaged with the first hinge plate 10 and the second hinge plate 13. When the upper and lower limiting bolts 12 are respectively inserted into their corresponding hinge holes, the head of the limiting bolt 12 is located in the mounting hole, and the axes of the upper and lower limiting bolts 12 are collinear. The head of the limiting bolt 12 cannot pass through the hinge hole. The cooperation between the limiting bolt 12 and the limiting nut 14 makes the hinge between the first hinge plate 10 and the second hinge plate 13 more stable.
[0032] like Figure 2 , Figure 4 As shown, a mounting base 9 is fixedly connected to the front side of the transmission box 3. The mounting base 9 has several fixing holes. Several threaded posts 21 corresponding to the fixing holes are fixedly connected to the rear side of the adjusting plate 6. After passing through the fixing holes, the threaded posts 21 are fixedly connected to the fixing nuts 15 by threaded engagement. The drive shaft passes through the mounting base 9 and rotates with the mounting base 9. After passing through the mounting base 9, the drive shaft enters the transmission box 3 and engages with the gear set inside the transmission box 3.
[0033] As a further illustration of this example, a support frame 4 is fixedly connected to the top of the front frame 1, and the front end of a suspension frame 22 is fixedly connected to the top of the support frame 4. The rear end of the suspension frame 22 is suspended, and a seat 5 is fixedly installed on the suspension frame 22. Due to space limitations in small agricultural machinery, the installation of the seat 5 is often difficult. However, by suspending the seat 5 with the suspension frame 22, the space for installing the seat 5 can be extended to the top of the rear frame 2, without affecting the hinge connection between the front frame 1 and the rear frame 2, that is, without affecting the normal steering of the agricultural machinery.
[0034] The working principle of this utility model is as follows: When it is necessary to install the transmission box 3 on the rear frame 2, firstly, the mounting seat 9 on the transmission box 3 is installed onto the adjusting plate 6 by fixing nut 15. Then, the adjusting plate 6 is aligned with the mounting plate 7, that is, the through hole in the middle of the adjusting plate 6 is aligned with the middle of the mounting plate 7, and the four threaded holes 16 correspond one-to-one with the middle of the four guide holes 17. Finally, the guide bolt 19 with washer 18 is installed from the front of the mounting plate 7 onto the threaded hole 16 of the adjusting plate 6, thereby completing the connection between the small agricultural machinery frame and the transmission box 3.
[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A connection structure between a small agricultural machinery frame and a transmission box, comprising a frame and a transmission box (3) mounted at the rear end of the frame, characterized in that, The input end of the transmission box (3) is fixedly connected to an adjustment plate (6), and the rear end of the frame is fixedly connected to a mounting plate (7). The middle part of the mounting plate (7) and the adjustment plate (6) are provided with through holes through which the drive shaft can pass. The mounting plate (7) is provided with several arc-shaped guide holes (17) around the through holes. The center of the circle of the arc corresponding to the guide hole (17) is located at the same point. The adjustment plate (6) is provided with a threaded hole (16). The threaded hole (16) is fixedly installed with a guide bolt (19) that slides with the guide hole (17) by threaded connection. The head of the guide bolt (19) is located on the front side of the mounting plate (7) and cannot pass through the guide hole (17).
2. The connection structure between the small agricultural machinery frame and the transmission box according to claim 1, characterized in that, A washer (18) is provided between the head of the guide bolt (19) and the mounting plate (7), and the washer (18) is fitted onto the thread of the guide bolt (19).
3. The connection structure between the small agricultural machinery frame and the transmission box according to claim 2, characterized in that, There are four guide holes (17), which are arranged in a circular array. There are four guide bolts (19), which correspond one-to-one with the guide holes (17).
4. The connection structure between the small agricultural machinery frame and the transmission box according to claim 1, characterized in that, The vehicle frame includes a front frame (1), and a rear frame (2) is hinged to the rear end of the front frame (1). The mounting plate (7) is fixedly connected to the rear end of the rear frame (2). Both the front frame (1) and the rear frame (2) are hollow structures.
5. The connection structure between the small agricultural machinery frame and the transmission box according to claim 4, characterized in that, The rear frame (2) is fixedly connected to the upper and lower sides of the front part with a first hinge plate (10), and the front frame (1) is fixedly connected to the top and bottom of the rear end with a second hinge plate (13). The first hinge plate (10) is hinged to the corresponding second hinge plate (13).
6. The connection structure between the small agricultural machinery frame and the transmission box according to claim 5, characterized in that, The first hinge plate (10) and the second hinge plate (13) are both provided with hinge holes. The side of the first hinge plate (10) away from the second hinge plate (13) is fixedly connected to a mounting block (11). The mounting block (11) is provided with a mounting hole with a diameter larger than the hinge hole. The head of the limiting bolt (12) is sleeved in the mounting hole. The head of the limiting bolt (12) cannot pass through the hinge hole. The screw of the limiting bolt (12) passes through the first hinge plate (10) and the second hinge plate (13) and extends to the side of the second hinge plate (13) away from the first hinge plate (10). The end of the limiting bolt (12) away from the first hinge plate (10) is fitted with a limiting nut (14) through a threaded engagement. The limiting bolt (12) is rotatably engaged with the first hinge plate (10) and the second hinge plate (13).
7. The connection structure between the small agricultural machinery frame and the transmission box according to claim 1, characterized in that... The front side of the transmission box (3) is fixedly connected to a mounting base (9), which has several fixing holes. The rear side of the adjusting plate (6) is fixedly connected to several threaded columns (21) corresponding to the fixing holes. The threaded columns (21) pass through the fixing holes and are fixedly connected to a fixing nut (15) by threaded engagement. The drive shaft passes through the mounting base (9) and rotates with the mounting base (9).
8. The connection structure between the small agricultural machinery frame and the transmission box according to claim 4, characterized in that... The front frame (1) is fixedly connected to the top of a support frame (4), the top of the support frame (4) is fixedly connected to the front end of a suspension frame (22), the rear end of the suspension frame (22) is suspended, and a seat (5) is fixedly installed on the suspension frame (22).