Triangular track assembly and tractor

Abstract

The utility model provides a triangular track assembly and a tractor. With the forward direction of the tractor as the front and the side close to a tractor body as the inner, the device comprises a driving wheel, a pivot, an upper bracket, a limiting shaft, a limiting groove, a lower bracket and a chain link. The driving wheels are arranged on a driving axle of the tractor; the pivot is arranged on the outer side of the driving wheel and integrally rotates with the driving wheel, the upper support is rotatably mounted on the pivot, the limiting groove is mounted on a tractor driving axle, the limiting shaft is inserted into the limiting groove and can slide along the limiting groove, the lower support is arranged below the upper support, and the front end of the lower support is rotatably connected with the upper support. The rear end of the lower support is rotationally connected with the upper support through a chain link. The triangular track assembly is mounted on the upper support as a whole, the upper support is rotatably mounted on the driving wheel, and the triangular track assembly can be directly assembled on the tractor driving axle as a whole and has excellent wheel-track interchangeability.

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] Wheeled and tracked tractors each have their advantages and disadvantages under different working conditions. For example, 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 have a large ground contact area, causing less damage to the soil, preventing soil compaction, and offering superior driving comfort and off-road capability. However, existing triangular track systems are difficult to install and disassemble, have poor interchangeability with tires, and cannot fully utilize the advantages of both types of tractors.

[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 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 mounted on the tractor drive axle; a pivot, the pivot being disposed outside the drive wheel and rotating integrally with the drive wheel; and an upper bracket, the upper bracket including a sleeve portion rotatably mounted on the pivot, a first inclined arm portion disposed on the front side of the sleeve portion, a second inclined arm portion disposed on the rear side of the sleeve portion, a first connecting portion located on the first inclined arm portion, and a second connecting portion located on the second inclined arm portion; [Limited] Positioning shaft, the positioning shaft is parallel to the pivot and disposed inside the first inclined arm or the second inclined arm; positioning groove, the positioning groove is installed on the tractor drive axle, the positioning shaft is inserted into the positioning groove and can slide along the positioning groove; lower bracket, the lower bracket is disposed below the upper bracket, and the front end of the lower bracket is rotatably connected to the first inclined arm; chain link, the chain 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 rotatably connected to the second inclined arm, and the other end of the second pull rod is rotatably connected to the rear end of the lower bracket.

[0006] Preferably, the limiting groove is disposed on the limiting bracket, and the limiting bracket is fixed on the tractor drive axle.

[0007] Preferably, the limiting groove is an arc-shaped groove with the pivot as the center, and the arc of the arc-shaped groove is not greater than π / 18.

[0008] Preferably, the lower support 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 portion, 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 portion will interfere with the plate.

[0009] Preferably, the front end of the lower support is rotatably provided with a first mounting part, and a tensioning actuator is provided between the first mounting part and the first main body part. The tensioning actuator includes a hydraulic cylinder provided between the first mounting part and the lower support and an accumulator provided on the lower support and connected to the hydraulic cylinder.

[0010] Preferably, a second mounting part is fixedly installed at the rear end of the lower bracket, and a limiting member is provided between the second inclined arm and the second mounting part. The limiting member includes a limiting block located above the second mounting part and a limiting surface located below the second inclined arm and corresponding to the limiting block.

[0011] Preferably, a third mounting part is provided in the middle of the lower bracket, and a support frame capable of swinging axially along its support axis is provided on the third mounting part.

[0012] Preferably, a first bearing and a second bearing are provided between the pivot and the sleeve portion. The inner surface of the sleeve portion is provided with a first step, and the connection between the drive wheel and the pivot is provided with a second step. The second bearing is axially limited by the outer step surface of the second step and the inner step surface of the first step. The first bearing is axially limited by the outer step surface of the second step and the inner end face of the limiting nut. The limiting nut is locked to the outer end face of the pivot by a threaded connection.

[0013] Preferably, the outer end face of the pivot is provided with a first groove along its diameter, the outer end face of the limiting nut is provided with a third step, the limiting nut is provided with a second groove, the second groove passes through the third step, and a flat key is provided between the first groove and the second groove to restrict the movement between the limiting nut and the pivot. The two ends of the flat key are flush with the inner step surface of the second step, the middle position of the flat key is flush with the outer step surface of the second step, and the second step is provided with an annular groove in the circumferential direction. An elastic retaining ring is provided in the annular groove, the inner side of the elastic retaining ring abuts against the two ends of the flat key, and the inner ring of the elastic retaining ring abuts against the middle position of the flat key.

[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: On the one hand, by mounting the triangular track assembly as a whole on the upper bracket and rotating the upper bracket on the drive wheel, the triangular track assembly can be directly assembled onto the tractor drive axle, providing excellent wheel-track interchangeability; on the other hand, the utility model adopts a three-stage contour-following shock absorption structure, which can change with the terrain, improving driving comfort and track passability. Attached Figure Description

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 This is a schematic diagram of the triangular track assembly in this utility model.

[0018] Figure 2 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.

[0019] Figure 3 This is a schematic diagram of the upper and lower supports in this utility model.

[0020] Figure 4 This is a cross-sectional schematic diagram of the upper and lower supports in this utility model.

[0021] Figure 5 This is a cross-sectional schematic diagram of the second tie rod in this utility model.

[0022] Figure 6 This is a schematic diagram of the support roller in this utility model.

[0023] Figure 7 This is a cross-sectional schematic diagram of the support roller in this utility model.

[0024] Figure 8 This is a cross-sectional schematic diagram of the central shaft and upper support of this utility model.

[0025] Figure 9 The limiting nut in this utility model ( Figure 8 A magnified view of a portion of region A in the middle.

[0026] Figure 10 This is an exploded view of the limiting structure in this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Drive wheel; 11. Pivot; 111. Second step; 113. First slot;

[0029] 2. Upper bracket; 21. First main body; 211. First inclined arm; 212. Second inclined arm; 22. Sleeve; 221. First step; 222. Oil injection hole; 23. First connecting part; 24. Second connecting part; 25. Tensioning actuator; 26. Limiting surface; 27. Limiting shaft;

[0030] 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;

[0031] 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;

[0032] 5a. First idler wheel; 5b. Second idler wheel;

[0033] 6a. First heavy roller; 6b. Second heavy roller; 61. Support shaft; 611. Shaft body; 612. Spherical structure; 613. Rocker body; 62. Support frame;

[0034] 7. Tracks;

[0035] 8. Limiting bracket; 81. Bracket body; 82. Limiting groove; 83. First mounting rod; 84. Second mounting rod;

[0036] 91. First bearing; 92. Second bearing; 93. Limit nut; 931. Third step; 932. Second groove; 934. Annular groove; 94. Flat key; 95. Elastic retaining ring; 96. Oil seal assembly;

[0037] 100. Triangular track assembly; 200. Drive axle; 210. Output shaft; 220. Output shaft housing. Detailed Implementation

[0038] 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.

[0039] 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."

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] See appendix Figures 1 to 10 This embodiment provides a triangular track assembly 100 for use in agricultural machinery such as tractors, enabling interchangeability between the triangular track assembly 100 and the tires. 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 various components described in this embodiment refer to the positional relationships between the various components of the triangular track assembly 100 in a horizontal, stationary state.

[0045] See appendix Figure 2The 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 pivot 11 is provided on the outer side of the drive wheel 1. The pivot 11 is coaxially mounted with the output shaft 210 and rotates integrally with the drive wheel 1. The upper bracket 2 is rotatably mounted on the pivot 11 via bearings.

[0046] See appendix Figure 3 The upper support 2 includes a first main body 21, a sleeve 22, a first connecting part 23, and a second connecting part 24. The sleeve 22 is loosely fitted onto the pivot 11 via a bearing and can rotate along the pivot 11. When the triangular track assembly 100 passes over a depression or slope, the upper support 2 has a certain sway angle, achieving a first-level contour-following shock absorption function. The first main body 21 is an irregularly shaped part, including a first inclined arm 211 and a second inclined arm 212. The first inclined arm 211 and the second inclined arm 212 extend forward and backward respectively from the sleeve 22 as the center position to the outer edge of the drive wheel 1, and then extend 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 disposed on the first inclined arm 211, and the second connecting part 24 is disposed on the second inclined arm 212. Both the first connecting part 23 and the second connecting part 24 are forward-facing and located on a symmetrical plane in the inner and outer directions of the drive wheel 1.

[0047] It is understandable that the upper support 2 and the drive wheel 1 are connected at a single point. When the triangular track assembly 100 passes through a depression or slope, the large difference in displacement between the front and rear ends of the lower support 3 will cause the upper support 2 and the lower support 3 to rotate along the pivot 11 as a whole, thus creating a safety hazard.

[0048] See Figure 2 A limiting shaft 27 parallel to the pivot 11 is provided on the inner side of the first inclined arm 211 or the second inclined arm 212. Preferably, the limiting shaft 27 is provided on the first inclined arm 211. Correspondingly, a limiting groove 82 is provided on the drive axle 200 of the tractor. The limiting shaft 27 is inserted into the limiting groove 82 and can slide along the limiting groove 82 to limit the swing angle of the upper support 2, so that the rotation angle of the upper support 2 and the lower support 3 as a whole along the pivot 11 is within a safe range.

[0049] See appendix Figure 2The limiting bracket 8 includes a bracket body 81, a limiting groove 82 disposed on the bracket body 81, a first mounting rod 83 connected to the bracket body 81 and fixed on the output shaft housing 220, and a second mounting rod 84 connected to the bracket body 81 and fixed on the side of the tractor drive axle 200. The limiting groove 82 is an arc-shaped groove with the pivot 11 as the center, and the arc of the arc-shaped groove is not greater than π / 18. The limiting shaft 27 is inserted into the limiting groove 82 and can slide along the limiting groove 82 to limit the range of motion of the upper bracket 2, so that the rotation angle of the triangular track assembly 100 along the pivot 11 is within a safe range.

[0050] See Figure 3 , 5 The lower bracket 3 is located below the upper bracket 2, and its front end is rotatably connected to the first inclined arm 211. 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 other end of the second main body 31 is rotatably connected to the second connecting part 24 via a link 4.

[0051] 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 21. The tensioning actuator 25 includes a hydraulic cylinder provided between the first mounting part 32 and the second main body 31 and an accumulator provided on the second main body 31 and connected to the hydraulic cylinder. When the triangular track assembly 100 is loose or encounters some impact that causes the track to tighten, the hydraulic cylinder can extend and retract in time to adapt to the changes in the track. The accumulator stabilizes the pressure inside the hydraulic cylinder to ensure that the entire track 7 is always in a taut state.

[0052] See appendix Figure 2 , 5 Link 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, thus playing a secondary conformal damping role.

[0053] 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 2 , 5A limiting member 35 is provided between the second inclined arm portion 212 and the second mounting portion 33. The limiting member 35 includes a limiting block 351 located above the second mounting portion 33 and a limiting surface 26 located below the second inclined arm portion 212 and corresponding to the limiting block 351. When the limiting block 351 abuts against the limiting surface 26, a limiting function is achieved. The limiting member 35 includes a limiting block 351 that is detachably mounted on the second main body portion 31 and shims 352 that adjust the height of the limiting block 351 relative to the second main body portion 31. The limiting block 351 is a consumable made of elastic rubber or similar materials, which not only serves as a shock absorber but also allows for height adjustment of the limiting member 35 by the number of shims 352, meeting different design requirements and compensating for wear on the limiting block 351.

[0054] On the other hand, see appendix Figure 4 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 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.

[0055] See appendix Figure 5 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.

[0056] See appendix Figure 1 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.

[0057] See appendix Figure 6The 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 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 the conformal damping effect.

[0058] See appendix Figure 7 The support shaft 61 includes a shaft body 611, with a spherical structure 612 located at the center of the shaft body 611. A layer of elastic material of a predetermined thickness, such as rubber, is wrapped around the spherical structure 612. The elastic material forms a rocker body 613. The support frame 62 is sleeved on the rocker body 613. When the track 7 undergoes displacement along the axial direction (i.e., the inner and outer direction) of the support shaft 61, the rocker body 613 will deform, so that the first heavy roller 6a and the second heavy roller 6b change along the inner and outer direction with the terrain, thereby realizing the three-level 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.

[0059] The entire triangular track assembly 100 is installed as a whole on the end drive axle 200 of the tractor. In other words, the stress of the triangular track assembly 100 is concentrated between the pivot 11 and the sleeve part 22. Therefore, how to ensure the connection stability between the pivot 11 and the upper support 2 is the foundation and difficulty of realizing the design of the triangular track assembly 100.

[0060] In this embodiment, to ensure the structural strength of the pivot 11, the traditional bolt fixing method is abandoned, and a shaft anti-loosening structure is designed instead. Specifically, refer to the appendix. Figure 8 A first bearing 91 and a second bearing 92 are provided between the pivot 11 and the sleeve portion 22 to realize the rotational connection between the pivot 11 and the upper support 2. The inner surface of the sleeve portion 22 is provided with a first step 221, and the connection between the drive wheel 1 and the pivot 11 is provided with a second step 111. The second bearing 92 is axially limited by the outer step surface of the second step 111 and the inner step surface of the first step 221. The first bearing 91 is axially limited by the outer step surface of the second step 111 and the inner end face of the limiting nut 93. The limiting nut 93 is locked onto the pivot 11 by a threaded connection.

[0061] See appendix Figure 9An oil seal assembly 96 is provided at the connection between the drive wheel 1, the pivot 11, and the sleeve portion 22. The oil seal assembly 96 includes a first sealing ring and a second sealing ring, a first sealing ring disposed on the first sealing ring and connected to the drive wheel 1, and a second sealing ring disposed on the second sealing ring and connected to the inner wall of the sleeve portion 22. The first bearing 91 and the second bearing 92 are spaced apart by a predetermined distance, forming a lubricating oil cavity between the pivot 11 and the sleeve portion 22. A corresponding oil injection hole 222 is provided on the sleeve portion 22 to lubricate the first bearing 91 and the second bearing 92.

[0062] See appendix Figure 9 , 10 A first groove 113 is provided on the outer end face of the pivot 11 along its diameter. A third step 931 is provided on the limiting nut 93. A second groove 932 is provided on the limiting nut 93, and the second groove 932 passes through the third step 931. A flat key 94 is engaged between the first groove 113 and the second groove 932. The flat key 94 restricts the movement between the limiting nut 93 and the pivot 11. The two ends of the flat key 94 are flush with the inner step surface of the second step 111, and the middle position of the flat key 94 is flush with the outer step surface of the second step 111. An annular groove 934 is provided on the circumference of the second step 111. An elastic retaining ring 95 is provided in the annular groove 934. The inner side of the elastic retaining ring 95 abuts against the two ends of the flat key 94, and the inner ring of the elastic retaining ring 95 abuts against the middle position of the flat key 94.

[0063] The limiting nut 93 is installed on the pivot 11 and abuts against the outer side of the first bearing 91. Then, the flat key 94 is locked between the first slot 113 and the second slot 932. Finally, the elastic retaining ring 95 is locked in the annular groove 934 to fix the flat key 94, prevent relative rotation between the limiting nut 93 and the pivot 11, and thus prevent relative movement between the upper bracket 2 and the pivot 11.

[0064] 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, Taking the direction of the tractor's forward movement as the front, and the side closest to the tractor body as the inside, it includes: A drive wheel, which is mounted on the tractor drive axle; A pivot, which is disposed outside the drive wheel and rotates integrally with the drive wheel; The upper support includes a sleeve portion rotatably mounted on the pivot, a first inclined arm portion disposed on the front side of the sleeve portion, a second inclined arm portion disposed on the rear side of the sleeve portion, a first connecting portion located on the first inclined arm portion, and a second connecting portion located on the second inclined arm portion; A limiting shaft is provided parallel to the pivot and disposed on the inner side of the first inclined arm or the second inclined arm; A limiting groove is installed on the tractor drive axle, and a limiting shaft is inserted into the limiting groove and can slide along the limiting groove; The lower support is disposed below the upper support, and the front end of the lower support is rotatably connected to the first inclined arm. 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 rotatably connected to the second inclined arm, and the other end of the second pull rod is rotatably connected to the rear end of the lower support.

2. The tractor triangular track assembly as described in claim 1, characterized in that, The limiting groove is provided on the limiting bracket, and the limiting bracket is fixed on the tractor drive axle.

3. The tractor triangular track assembly as described in claim 2, characterized in that, The limiting groove is an arc-shaped groove with the pivot as the center, and the arc of the arc-shaped groove is not greater than π / 18.

4. The tractor triangular track assembly as described in claim 1, characterized in that, The lower support 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.

5. The tractor triangular track assembly as described in claim 2, 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.

6. The tractor triangular track assembly as described in claim 1, characterized in that, The lower support is rotatably provided with a first mounting part, and a tensioning actuator is provided between the first mounting part and the first main body part. The tensioning actuator includes a hydraulic cylinder provided between the first mounting part and the lower support and an accumulator provided on the lower support and connected to the hydraulic cylinder.

7. The tractor triangular track assembly as described in claim 1, characterized in that, The rear end of the lower bracket is fixedly installed with a second mounting part, and a limiting member is provided between the second inclined arm and the second mounting part. The limiting member includes a limiting block located above the second mounting part and a limiting surface located below the second inclined arm and corresponding to the limiting block.

8. The tractor triangular track assembly as described in claim 1, characterized in that, A first bearing and a second bearing are provided between the pivot and the sleeve. The inner surface of the sleeve is provided with a first step, and the connection between the drive wheel and the pivot is provided with a second step. The second bearing is axially limited by the outer step surface of the second step and the inner step surface of the first step. The first bearing is axially limited by the outer step surface of the second step and the inner end face of the limiting nut. The limiting nut is locked to the outer end face of the pivot by a threaded connection.

9. The tractor triangular track assembly as described in claim 8, characterized in that, The outer end face of the pivot is provided with a first groove along its diameter. The outer end face of the limiting nut is provided with a third step. The limiting nut is provided with a second groove, which passes through the third step. A flat key is provided between the first groove and the second groove to restrict the movement between the limiting nut and the pivot. The two ends of the flat key are flush with the inner step surface of the second step, and the middle position of the flat key is flush with the outer step surface of the second step. The second step is provided with an annular groove in the circumferential direction. An elastic retaining ring is provided in the annular groove. The inner side of the elastic retaining ring abuts against the two ends of the flat key, and the inner ring of the elastic retaining ring abuts against the middle position of the flat key.

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

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