Triangular track assembly and tractor

Abstract

The utility model provides a triangular track assembly and a tractor. The tractor driving device comprises a driving wheel, an upper support, a lower support and a chain link, the driving wheel is arranged on an output shaft of a tractor driving axle, the upper support comprises a first main body part which is fixedly installed on a tractor main body and located on the outer side of the driving wheel, and the lower support comprises a second main body part arranged below the first main body part. The front end of the first main body part is rotationally connected with the front end of the second main body part; each chain link comprises a first pull rod and a second pull rod hinged to each other, the other end of the first pull rod is hinged to the rear end of the first body part, and the other end of the second pull rod is hinged to the rear end of the second body part. The triangular track assembly is installed on the upper support as a whole, the upper support is directly installed on the tractor body, the driving shaft is only used for power transmission and does not participate in bearing of the weight of the whole tractor, the strength of the driving shaft and the bearing of the driving shaft is good, and the whole triangular track has longer service life.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to a triangular track assembly and a tractor. Background Technology

[0002] Among related technologies, wheeled tractors perform reasonably well on hard soil, but their off-road capability is weak, their ability to get out of trouble is poor, and they can leave deep crevices in cultivated land, causing soil compaction. Tracked tractors, on the other hand, have a large ground contact area, causing less damage to the soil and preventing soil compaction, while also improving driving comfort and the tractor's mobility. However, existing triangular track systems are not only difficult to install and disassemble, but also have poor interchangeability with tires.

[0003] Therefore, it is necessary to provide a triangular track assembly and tractor to overcome the defects mentioned above. Utility Model Content

[0004] The purpose of this utility model is to provide a triangular track assembly and a tractor.

[0005] According to one aspect of the present invention, a triangular track assembly for a tractor is provided, with the tractor's forward direction as the front and the side closest to the tractor body as the inner side, comprising: a drive wheel, the drive wheel being disposed on the output shaft of the tractor drive axle; an upper bracket, the upper bracket including a first main body portion fixedly mounted on the tractor body and located outside the drive wheel; and a lower bracket, the lower bracket including a second main body portion disposed below the first main body portion, a first mounting portion located at the front end of the second main body portion, a second mounting portion located at the rear end of the second main body portion, and a third mounting portion located in the middle of the second main body portion, the front end of the first main body portion being connected to the second main body portion. The main body has a rotatable connection at its front end; a chain link, which includes a first tie rod and a second tie rod hinged to each other, the other end of the first tie rod being hinged to the rear end of the first main body, and the other end of the second tie rod being hinged to the rear end of the second main body; an idler wheel, which includes a first idler wheel mounted on a first mounting part and a second idler wheel mounted on a second mounting part; a support roller, which includes a first support roller and a second support roller disposed on a third mounting part; and a track, which is wound around the drive wheel, the first idler wheel, the first support roller, the second support roller, and the second idler wheel, such that rotation of the drive wheel causes movement of the track.

[0006] Preferably, a mounting base is fixedly installed on the end cover of the drive axle, the output shaft passes through the mounting base and is fixedly installed on the mounting base by bearings, and the front and rear ends of the first main body are respectively provided with a first bracket and a second bracket, which are fixedly installed on the mounting base.

[0007] Preferably, the first bracket portion is disposed along the front of the outer edge of the drive wheel and extends to the outside of the drive wheel and is fixedly connected to the front end of the first main body portion, and the second bracket portion is disposed along the rear of the outer edge of the drive wheel and extends to the outside of the drive wheel and is fixedly connected to the rear end of the first main body portion.

[0008] Preferably, the support roller further includes a support frame mounted on the third mounting part and capable of swinging along its support axis, wherein the first support roller and the second support roller are respectively mounted on the front end and the rear end of the support frame.

[0009] Preferably, the support shaft includes a shaft body, a spherical portion located at the middle of the shaft body, and a rocker body made of elastic material that wraps around the spherical portion. The support frame has a sleeve portion that is sleeved onto the rocker body.

[0010] Preferably, the two ends of the rocker body are respectively provided with a first end cap and a second end cap, and the inner contour of the first end cap and the inner contour of the first end cap are adapted to the outer contour of the rocker body. The inner surface of the sleeve is provided with an annular step and an annular groove. A retaining spring is engaged on the annular groove. A spacer, a first end cap, a rocker body and a second end cap are sequentially fixed from the retaining spring to the annular step.

[0011] Preferably, a limiting member is further provided between the rear end of the first main body and the rear end of the second main body. The limiting member includes a limiting block provided on the second main body and a limiting surface provided below the first main body and corresponding to the limiting block.

[0012] Preferably, the second main body includes two plates and a pin disposed between the two plates. The lower part of the second pull rod is rotatably mounted on the pin. The middle part of the second pull rod is bent outward and / or inward to form a clearance part, such that the upper part of the second pull rod is located on the same vertical plane as at least one plate. When the rotation angle of the second pull rod is greater than a threshold, the clearance part will interfere with the plate.

[0013] Preferably, a reinforcing rib is provided between the two plates, and a portion of the reinforcing rib is located on the movement trajectory of the second tie rod. When the rotation angle of the second tie rod is greater than a threshold, the second tie rod will interfere with a portion of the reinforcing rib.

[0014] According to another aspect of the present invention, a tractor is provided, including the aforementioned triangular track assembly.

[0015] Compared with the prior art, the triangular track assembly and tractor provided by this utility model have the following beneficial effects:

[0016] This invention features a triangular track assembly mounted as a single unit on an upper support, which is then directly mounted on the tractor body. The drive shaft is used solely for power transmission and does not contribute to bearing the weight of the entire machine. This design ensures the drive shaft and its bearings have high strength, resulting in a longer service life for the entire triangular track. Furthermore, this invention employs a two-stage contour-following shock absorption structure, which adapts to changes in terrain, improving driving comfort and track clearance. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 This is a schematic diagram of the triangular track assembly in this utility model.

[0019] Figure 2 This is a cross-sectional schematic diagram of the triangular track assembly in this utility model.

[0020] Figure 3 For the link in this utility model ( Figure 2 Enlarged view of a portion of area A in the middle.

[0021] Figure 4 This is a schematic diagram of the triangular track assembly (without showing the track, drive wheel, idler wheel, and support wheel) in this utility model.

[0022] Figure 5 This is a schematic diagram of the upper and lower supports in this utility model.

[0023] Figure 6 This is a cross-sectional schematic diagram of the second tie rod in this utility model.

[0024] Figure 7 This is a schematic diagram of the support roller in this utility model.

[0025] Figure 8 This is a cross-sectional schematic diagram of the support roller in this utility model.

[0026] Figure 9 This is a schematic diagram of the support shaft in this utility model.

[0027] Figure 10 The support shaft in this utility model ( Figure 8 A magnified view of a portion of region B in the middle.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Drive wheels;

[0030] 2. Upper support; 21. First main body; 22a. First bracket; 22b. Second bracket; 23. First connecting part; 24. Second connecting part; 25. Tensioning actuator; 26. Limiting surface;

[0031] 3. Lower bracket; 31. Second main body; 311. Plate; 312. Pin; 313. Reinforcing rib; 314. Limiting area; 32. First mounting part; 33. Second mounting part; 34. Third mounting part; 35. Limiting component; 351. Limiting block; 352. Gasket;

[0032] 4. Link; 41. First tie rod; 42. Second tie rod; 421. Upper part of the second tie rod; 422. Clearance part; 423. Lower part of the second tie rod;

[0033] 5a. First idler wheel; 5b. Second idler wheel;

[0034] 6a. First supporting roller; 6b. Second supporting roller; 61. Support shaft; 611. Shaft body; 612. Spherical part; 613. Rocker body; 6131. ​​Cylindrical surface; 6132. Conical surface; 6133. Transition surface; 6134. Groove part; 62. Support frame; 621. Sleeve part; 6211. Annular step; 6212. Annular groove; 63. First end cap; 64. Second end cap; 65. Spacer; 66. Snap ring;

[0035] 7. Tracks;

[0036] 100. Triangular track assembly; 200. Drive axle; 210. Output shaft; 220. End cover; 230. Mounting base. Detailed Implementation

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0039] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0040] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0043] See Figures 1 to 10 This embodiment discloses a triangular track assembly 100 for use in agricultural machinery such as tractors. The triangular track assembly 100 includes: a drive wheel 1, an upper support 2, a lower support 3, a chain link 4, an idler wheel, a track roller, and a track 7. This embodiment uses a tractor as an example, with the tractor's forward direction considered "front" and the side closest to the tractor body considered "inner." Unless otherwise specified, the positional relationships between the components described in this embodiment are the positional relationships between the components of the triangular track assembly 100 in a horizontal, stationary state.

[0044] See appendix Figure 1 , 2 The drive wheel 1 is mounted on the output shaft 210 of the tractor drive axle 200. The inner side of the drive wheel 1 is connected to the output shaft 210 via a spline. The tractor drives the drive wheel 1 to rotate via the drive axle 200. A mounting base 230 is fixedly mounted on the end cover 220 of the drive axle 200. The output shaft 210 passes through the mounting base 230 and is fixedly mounted on the mounting base 230 via a bearing. During the rotation of the drive axle 200, the end cover 220 and the output shaft 210 can rotate synchronously to achieve steering of the tractor.

[0045] See appendix Figure 4The upper bracket 2 includes a first support portion 22a fixedly mounted on the mounting base 230, a second support portion 22b fixedly mounted on the mounting base 230, and a first main body portion 21 connecting the first support portion 22a and the second support portion 22b and located outside the drive wheel 1. The first support portion 22a is disposed in front of the outer edge of the drive wheel 1 and extends to the outer side of the drive wheel 1, and the second support portion 22b is disposed behind the outer edge of the drive wheel 1 and extends to the outer side of the drive wheel 1. By directly connecting the upper bracket 2 to the tractor body, the force of the entire tractor is directly transmitted to the track rollers, idler rollers and tracks 7 through the upper bracket 2, without passing through the drive wheel 1. The force on the drive wheel 1 is smaller, and the service life of the entire triangular track assembly 100 is longer.

[0046] See appendix Figure 4 The first main body 21 is an irregularly shaped part, extending forward and backward to the outer edge of the drive wheel 1, and then extending along the outer edge of the drive wheel 1 towards the inner side of the drive wheel 1 to a symmetrical plane passing through the inner and outer directions of the drive wheel 1. The first connecting part 23 is provided at the front end of the first main body 21, and the second connecting part 24 is provided at the rear end of the first main body 21. Both the first connecting part 23 and the second connecting part 24 are provided facing forward and located on the symmetrical plane of the inner and outer directions of the drive wheel 1.

[0047] See appendix Figure 5 The lower bracket 3 is located below the upper bracket 2. The lower bracket 3 includes a second main body 31 located below the first main body 21, a first mounting part 32 located at the front end of the second main body 31, a second mounting part 33 located at the rear end of the second main body 31, and a third mounting part 34 located in the middle of the second main body 31. The front end of the second main body 31 is rotatably connected to the first connecting part 23, and the rear end of the second main body 31 is rotatably connected to the second connecting part 24 through a link 4.

[0048] The front end of the lower support 3 is rotatably provided with a first mounting part 32. A tensioning actuator 25 is provided between the first mounting part 32 and the first main body part 21. The tensioning actuator 25 includes a hydraulic cylinder provided between the first mounting part 32 and the second main body part 31 and an accumulator provided on the second main body part 31 and connected to the hydraulic cylinder. When the triangular track assembly 100 is loose or encounters some impact that causes the track 7 to tighten, the hydraulic cylinder can extend and retract in time to adapt to the changes in the track 7. The pressure inside the hydraulic cylinder is stabilized by the accumulator to ensure that the entire track 7 is always in a taut state.

[0049] See appendix Figure 3 , 5Link 4 includes a first tie rod 41 and a second tie rod 42 that are hinged to each other. The other end of the first tie rod 41 is hinged to the first main body 21, and the other end of the second tie rod 42 is hinged to the rear end of the second main body 31. That is, when the lower support 3 is displaced, the first tie rod 41 and the second tie rod 42 rotate relative to each other between the rear ends of the first main body 21 and the rear ends of the second main body 31, which plays a first-stage conformal damping role.

[0050] To ensure smooth tractor operation, the range of motion of link 4 needs to be limited to avoid being too large or too small. (See appendix.) Figure 3 A limiting member 35 is also provided between the rear end of the first main body 21 and the rear end of the second main body 31. The limiting member 35 includes a limiting block 351 located above the second mounting part 33 and a limiting surface 26 located below the first main body 21 and corresponding to the limiting block 351. When the limiting block 351 abuts against the limiting surface 26, the limiting function is realized.

[0051] The limiting component 35 includes a limiting block 351 that is detachably mounted on the second main body 31 and a shim 352 that adjusts the height of the limiting block 351 relative to the second main body 31. The limiting block 351 is a consumable made of elastic rubber or other materials. It not only plays a role in shock absorption and cushioning, but also adjusts the limiting height by setting the number of shims 352 to meet different design requirements and compensate for wear of the limiting block 351.

[0052] On the other hand, see appendix Figure 6 The lower part 423 of the second pull rod is located inside or outside the second main body 31, and the upper part 421 of the second pull rod is bent outward or inward, so that the upper part 421 of the second pull rod and the second main body 31 are located on the same vertical plane. The bending transition area between the upper part 421 of the second pull rod and the lower part 423 of the second pull rod is the avoidance part 422. When the second pull rod 42 and the second main body 31 rotate relative to each other and the relative rotation angle is small, the avoidance part 422 will not come into contact with the second main body 31. When the rotation angle between the second pull rod 42 and the second main body 31 is too large, it will cause interference between the avoidance part 422 and the second main body 31, thereby achieving a self-limiting function and preventing the chain link 4 from having too much movement.

[0053] See appendix Figure 3 A reinforcing rib 313 is also provided between the two plates 311. A portion of the reinforcing rib 313 is located on the movement trajectory of the second tie rod 42. The portion of the reinforcing rib 313 is defined as the limiting area 314. When the rotation angle of the second tie rod 42 is greater than the threshold, the second tie rod 42 will rotate counterclockwise around the pin 312 until it collides with the limiting area 314 of the reinforcing rib 313. At this time, the triangular track assembly 100 reaches its maximum range of motion, ensuring the structural stability and driving smoothness of the tractor.

[0054] See appendix Figure 1 , 2 The idler wheels include a first idler wheel 5a mounted on the first mounting portion 32 and a second idler wheel 5b mounted on the second mounting portion 33. The support rollers include a first support roller 6a and a second support roller 6b mounted on the third mounting portion 34. The track 7 is wound around the drive wheel 1, the first idler wheel 5a, the first support roller 6a, the second support roller 6b, and the second idler wheel 5b, such that rotation of the drive wheel 1 causes movement of the track 7.

[0055] See appendix Figure 7 The support roller includes a support frame 62 mounted on the third mounting part 34 and capable of swinging along its support shaft 61. The first support roller 6a and the second support roller 6b are respectively mounted on the front and rear ends of the support frame 62, so that the first support roller 6a and the second support roller 6b can change along the direction perpendicular to the axial direction of the support shaft 61 (i.e., the forward direction) with the change of terrain, thereby achieving a two-stage conformal damping effect.

[0056] See appendix Figure 8 The support shaft 61 includes a shaft body 611, a spherical part 612 located in the middle of the shaft body 611, and a rocker body 613 made of elastic material that wraps around the spherical part 612. The elastic material can be rubber. The support frame 62 is provided with a sleeve part 621, which is sleeved on the rocker body 613. When the track 7 moves along the axial direction (i.e., the inner and outer directions) of the support shaft 61, the rocker body 613 will deform, so that the first heavy wheel 6a and the second heavy wheel 6b can change along the inner and outer directions with the change of terrain, thereby realizing the conformal shock absorption function. At the same time, the plasticity of the rocker body 613 can also reduce the impact of ground changes on the tractor.

[0057] See appendix Figure 9 The inner surface of the rocker body 613 is fitted to the spherical part 612. The outer circumference of the middle region of the rocker body 613 is a cylindrical surface 6131, which is locked between the retaining spring 66 and the annular step 6211. The outer circumference of the two ends of the rocker body 613 is a conical surface 6132. The connection between the conical surface 6132 and the cylindrical surface 6131 is a transition surface 6133, so that the thickness of the rocker body 613 at both ends is approximately the same as the thickness of the rocker body 613 in the middle, ensuring that the rocker body 613 has approximately the same radial stiffness and improving the deformation uniformity of the entire rocker body 613.

[0058] Both ends of the rocker body 613 have tapered grooves 6134. The grooves 6134 release some of the internal stress during the compression deformation of the rubber, and change the circumferential outward flow deformation. This avoids problems such as bulging and excessive deformation at both ends of the rocker body 613, reduces the axial deformation of the rocker body 613 after compression, and ensures that the rocker body 613 will not interfere with the shaft body 611 during the load-bearing process.

[0059] See attached Figure 10 The rocker body 613 has a first end cap 63 and a second end cap 64 on its two end faces, respectively. The inner contour of the first end cap 63 is adapted to the outer contour of the rocker body 613, that is, it extends from the transition surface 6133 at both ends of the cylindrical surface 6131 to the end face of the rocker body 613. The first end cap 63 and the second end cap 64 constrain the circumferential outer surface of both ends of the rocker body 613, preventing radial bulging of the rubber layer within the normal load range, thereby improving the reliability and stability of the rocker body 613.

[0060] Specifically, the inner surface of the sleeve portion 621 is provided with an annular step 6211 and an annular groove 6212. A retaining spring 66 is engaged in the annular groove 6212. From the retaining spring 66 to the annular step 6211, a spacer 65, a first end cap 63, a rocker body 613, and a second end cap 64 are sequentially fixed. By replacing the spacer 65 with different thicknesses, the user can adjust the distance between the first end cap 63 and the second end cap 64, thereby adjusting the initial axial length of the rocker body 613, thus adjusting the variable stiffness of the rocker body 613 and achieving wear compensation of the rocker body 613.

[0061] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A triangular track assembly for a tractor, characterized in that, With the tractor's forward direction as the front, and the side closest to the tractor's main body as the inner side, including: A drive wheel, which is mounted on the output shaft of the tractor drive axle; The upper bracket includes a first main body portion that is fixedly mounted on the tractor body and located outside the drive wheel; The lower bracket includes a second main body portion disposed below the first main body portion, a first mounting portion located at the front end of the second main body portion, a second mounting portion located at the rear end of the second main body portion, and a third mounting portion located in the middle of the second main body portion. The front end of the first main body portion is rotatably connected to the front end of the second main body portion. The link includes a first pull rod and a second pull rod that are hinged to each other. The other end of the first pull rod is hinged to the rear end of the first main body, and the other end of the second pull rod is hinged to the rear end of the second main body. An idler wheel, comprising a first idler wheel mounted on a first mounting portion and a second idler wheel mounted on a second mounting portion; The support roller includes a first support roller and a second support roller disposed on the third mounting part; A track, which is wound around the drive wheel, a first idler wheel, a first support wheel, a second support wheel, and a second idler wheel, such that rotation of the drive wheel causes movement of the track.

2. The tractor triangular track assembly as described in claim 1, characterized in that, A mounting base is fixedly installed on the end cover of the drive axle. The output shaft passes through the mounting base and is fixedly installed on the mounting base by bearings. The front and rear ends of the first main body are respectively provided with a first bracket and a second bracket. The first bracket and the second bracket are fixedly installed on the mounting base.

3. The tractor triangular track assembly as described in claim 2, characterized in that, The first bracket portion is disposed along the front of the outer edge of the drive wheel and extends to the outside of the drive wheel and is fixedly connected to the front end of the first main body portion. The second bracket portion is disposed along the rear of the outer edge of the drive wheel and extends to the outside of the drive wheel and is fixedly connected to the rear end of the first main body portion.

4. The tractor triangular track assembly as described in claim 1, characterized in that, The support roller also includes a support frame mounted on the third mounting part and capable of swinging along its support axis, wherein the first support roller and the second support roller are respectively mounted on the front end and the rear end of the support frame.

5. The tractor triangular track assembly as described in claim 4, characterized in that, The support shaft includes a shaft body, a spherical portion located in the middle of the shaft body, and a rocker body made of elastic material that wraps around the spherical portion. The support frame has a sleeve portion that is sleeved onto the rocker body.

6. The tractor triangular track assembly as described in claim 5, characterized in that, The two ends of the rocker body are respectively provided with a first end cap and a second end cap, and the inner contour of the first end cap and the inner contour of the first end cap are adapted to the outer contour of the rocker body. The inner surface of the sleeve is provided with an annular step and an annular groove. A retaining spring is engaged on the annular groove. A spacer, a first end cap, a rocker body and a second end cap are sequentially fixed from the retaining spring to the annular step.

7. The tractor triangular track assembly as described in claim 1, characterized in that, A limiting member is also provided between the rear end of the first main body and the rear end of the second main body. The limiting member includes a limiting block provided on the second main body and a limiting surface provided below the first main body and corresponding to the limiting block.

8. The tractor triangular track assembly as described in claim 1, characterized in that, The second main body includes two plates and a pin shaft disposed between the two plates. The lower part of the second pull rod is rotatably mounted on the pin shaft. The middle part of the second pull rod is bent outward and / or inward to form a clearance part, so that the upper part of the second pull rod is located on the same vertical plane as at least one plate. When the rotation angle of the second pull rod is greater than a threshold, the clearance part will interfere with the plate.

9. The tractor triangular track assembly as described in claim 8, characterized in that, A reinforcing rib is also provided between the two plates. A portion of the reinforcing rib is located on the movement trajectory of the second tie rod. When the rotation angle of the second tie rod is greater than a threshold, the second tie rod will interfere with a portion of the reinforcing rib.

10. A tractor, characterized in that, Includes the triangular track assembly as described in any one of claims 1 to 9.

Images