Triangular track assembly and tractor

Abstract

The invention provides a triangular track assembly and a tractor. The 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 drive 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 the longer service life.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, in particular to a triangular crawler assembly and a tractor. Background Art

[0002] In the related art, wheeled tractors work well on hard land, but they have weak off-road capability and poor escape performance, which will cause deep soil compaction on the cultivated land. Crawler tractors have a large ground contact area, low soil damage, and will not compact the land. At the same time, they improve the driving comfort and the passing ability of the tractor. However, the existing triangular crawler device is not only difficult to install, but also inconvenient to disassemble and assemble, and has poor interchangeability with tires.

[0003] Therefore, it is necessary to provide a triangular crawler assembly and a tractor to overcome the above-mentioned defectives. Summary of the invention

[0004] The purpose of the present invention is to provide a triangular crawler assembly and a tractor.

[0005] According to one aspect of the present invention, a triangular crawler assembly for a tractor is provided, with the tractor's forward direction as the front and the side close to the tractor body as the inner side, comprising: a driving wheel, the driving wheel is arranged on the output shaft of the tractor drive bridge; an upper bracket, the upper bracket includes a first main body portion fixedly mounted on the tractor body and located outside the driving wheel; a lower bracket, the lower bracket includes a second main body portion arranged 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, and the first mounting portion is located at the rear end of the second main body portion. A front end of a main body is rotatably connected to the front end of the second main body; a chain link, the chain link includes 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 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, the idler wheel includes a first idler wheel installed on the first mounting portion and a second idler wheel installed on the second mounting portion; a supporting roller, the supporting roller includes a first supporting roller and a second supporting roller arranged on the third mounting portion; a crawler track, the crawler track is wound across the drive wheel, the first idler wheel, the first supporting roller, the second supporting roller and the second idler wheel, so that the rotation of the drive wheel causes the crawler track to move.

[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 through a bearing, and the front and rear ends of the first main body are respectively provided with a first frame part and a second frame part, and the first frame part and the second frame part are fixedly installed on the mounting base.

[0007] Preferably, the first frame part is arranged along the front of the outer edge of the driving wheel and extends to the outside of the driving wheel and is fixedly connected to the front end of the first main body part, and the second frame part is arranged along the rear of the outer edge of the driving wheel and extends to the outside of the driving wheel and is fixedly connected to the rear end of the first main body part.

[0008] Preferably, the supporting roller further comprises a supporting frame mounted on the third mounting portion and capable of swinging along its supporting axis, and the first supporting roller and the second supporting roller are respectively mounted at the front end and the rear end of the supporting frame.

[0009] Preferably, the supporting shaft comprises a shaft body, a spherical portion arranged in the middle of the shaft body, and a swinging body wrapped around the spherical portion and made of elastic material, and the supporting frame is provided with a sleeve portion, and the sleeve portion is sleeved on the swinging body.

[0010] Preferably, the two end surfaces of the rocking body are respectively provided with a first end cover and a second end cover, and the inner contour of the first end cover and the inner contour of the first end cover are both adapted to the outer contour of the rocking body, and the inner surface of the sleeve portion is provided with an annular step and an annular groove, and a retaining spring is clamped on the annular groove, and a spacer, a first end cover, the rocking body and the second end cover are fixed in sequence from the retaining spring to the annular step.

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

[0012] Preferably, the second main body includes two plates and a pin shaft arranged between the two plates, the lower part of the second pull rod is rotatably mounted on the pin shaft, and the middle part of the second pull rod is bent outward and / or inward to form an avoidance portion, so that the upper part of the second pull rod and at least one plate body are located on the same vertical plane, and when the rotation angle of the second pull rod is greater than a threshold value, the avoidance portion will interfere with the plate body.

[0013] Preferably, a reinforcing rib plate is further provided between the two plates, and a partial area of ​​the reinforcing rib plate is provided on the movement trajectory of the second pull rod. When the rotation angle of the second pull rod is greater than a threshold, the second pull rod will interfere with a partial area of ​​the reinforcing rib plate.

[0014] According to another aspect of the present invention, there is provided a tractor comprising the above-mentioned triangular crawler track assembly.

[0015] Compared with the prior art, the triangular crawler assembly and tractor provided by the present invention have the following beneficial effects:

[0016] On the one hand, the present invention installs the triangular crawler assembly as a whole on the upper bracket, and directly installs the upper bracket on the tractor body. The drive shaft is only used for power transmission and does not participate in bearing the weight of the whole machine. The drive shaft and its bearing have good strength, and the overall triangular crawler has a longer service life. On the other hand, the present invention adopts a two-level contoured shock-absorbing structure, which can change with the change of terrain, thereby improving the driving comfort and the passability of the crawler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0018] Figure 1 It is a structural schematic diagram of the triangular crawler assembly in the present invention.

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the triangular crawler assembly of the present invention.

[0020] Figure 3 is the chain link of the present invention ( Figure 2 A area in the middle) Partially enlarged view.

[0021] Figure 4 It is a schematic diagram of the structure of the triangular track assembly of the present invention (the track, driving wheel, idler wheel and supporting wheel are hidden).

[0022] Figure 5 It is a schematic diagram of the structure of the upper bracket and the lower bracket in the present invention.

[0023] Figure 6 It is a cross-sectional schematic diagram of the second pull rod in the present invention.

[0024] Figure 7 It is a schematic structural diagram of the supporting wheel in the present invention.

[0025] Figure 8 It is a cross-sectional schematic diagram of the supporting wheel in the present invention.

[0026] Fig. 9 It is a schematic structural diagram of the support shaft in the present invention.

[0027] Fig.10 The supporting shaft ( Figure 8 A partial enlarged view of area B in the middle.

[0028] Description of reference numerals:

[0029] 1. Driving wheel;

[0030] 2. upper bracket; 21. first main body; 22a. first holding frame; 22b. second holding frame; 23. first connecting portion; 24. second connecting portion; 25. tensioning actuator; 26. limiting surface;

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

[0032] 4. Chain link; 41. First tie rod; 42. Second tie rod; 421. Upper portion of second tie rod; 422. Avoiding portion; 423. Lower portion of second tie rod;

[0033] 5a, first idler wheel; 5b, second idler wheel;

[0034] 6a, first supporting roller; 6b, second supporting roller; 61, supporting shaft; 611, shaft body; 612, spherical portion; 613, swinging body; 6131, cylindrical surface; 6132, conical surface; 6133, transition surface; 6134, notch portion; 62, supporting frame; 621, sleeve portion; 6211, annular step; 6212, annular groove; 63, first end cover; 64, second end cover; 65, spacer; 66, retaining spring;

[0035] 7. Tracks;

[0036] 100. triangular crawler track assembly; 200. drive axle; 210. output shaft; 220. end cover; 230. mounting base. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0039] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0040] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0043] See also Figures 1 to 10 The present embodiment discloses a triangular crawler assembly 100 for use in agricultural machinery such as tractors. The triangular crawler assembly 100 includes a driving wheel 1, an upper bracket 2, a lower bracket 3, a chain link 4, an idler wheel, a supporting wheel, and a crawler 7. The present embodiment is described by taking a tractor as an example, and the forward direction of the tractor is taken as the front, and the side close to the tractor body is taken as the inner side. Unless otherwise specified, the positional relationship between the various components described in the present embodiment is the positional relationship between the various components of the triangular crawler assembly 100 in a horizontal and stationary state.

[0044] See attached Figure 1 , 2 The driving wheel 1 is arranged on the output shaft 210 of the tractor driving axle 200. The inner side of the driving wheel 1 is connected to the output shaft 210 through a spline. The tractor drives the driving wheel 1 to rotate through the driving axle 200. A mounting base 230 is fixedly installed on the end cover 220 of the driving axle 200. The output shaft 210 passes through the mounting base 230 and is fixedly installed on the mounting base 230 through a bearing. During the rotation of the driving axle 200, the end cover 220 and the output shaft 210 can keep rotating synchronously to realize the steering of the tractor.

[0045] See attached Figure 4The upper bracket 2 includes a first bracket portion 22a fixedly mounted on the mounting base 230, a second bracket portion 22b fixedly mounted on the mounting base 230, and a first main body portion 21 connecting the first bracket portion 22a and the second bracket portion 22b and located outside the driving wheel 1. The first bracket portion 22a is arranged in front of the outer edge of the driving wheel 1 and extends to the outside of the driving wheel 1, and the second bracket portion 22b is arranged behind the outer edge of the driving wheel 1 and extends to the outside of the driving wheel 1. By directly connecting the upper bracket 2 to the tractor body, the force of the entire tractor is directly transmitted to the supporting wheels, the idler wheel and the crawler 7 through the upper bracket 2 without passing through the driving wheel 1. The force on the driving wheel 1 is small, and the service life of the entire triangular crawler assembly 100 is longer.

[0046] See attached Figure 4 The first main body 21 is a special-shaped part. The first main body 21 extends forward and rearward to the outer edge of the driving wheel 1, and then extends along the outer edge of the driving wheel 1 to the inner side of the driving wheel 1 to the symmetric plane passing through the inner and outer directions of the driving wheel 1. The first connecting portion 23 is arranged at the front end of the first main body 21, and the second connecting portion 24 is arranged at the rear end of the first main body 21. The first connecting portion 23 and the second connecting portion 24 are both arranged forward and located on the symmetric plane of the inner and outer directions of the driving wheel 1.

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

[0048] The front end of the lower bracket 3 is rotatably provided with a first mounting portion 32, and a tensioning actuator 25 is provided between the first mounting portion 32 and the first main body portion 21. The tensioning actuator 25 includes an oil cylinder provided between the first mounting portion 32 and the second main body portion 31 and an accumulator provided on the second main body portion 31 and connected to the oil cylinder. When the triangular track assembly 100 is loose or encounters certain impacts that cause the track 7 to be tensioned, the oil cylinder can be extended and retracted in time to adapt to the changes of the track 7, and the pressure inside the oil cylinder is stabilized by the accumulator to ensure that the entire track 7 is always in a tensioned state.

[0049] See attached Figure 3 , 5The chain link 4 includes a first pull rod 41 and a second pull rod 42 which are hinged to each other, the other end of the first pull rod 41 is hinged to the first main body 21, and the other end of the second pull rod 42 is hinged to the rear end of the second main body 31. That is to say, when the lower bracket 3 is displaced, the first pull rod 41 and the second pull rod 42 rotate relatively between the rear end of the first main body 21 and the rear end of the second main body 31, playing a primary contouring shock absorbing role.

[0050] In order to ensure the smoothness of the tractor's driving, the movement of the chain link 4 needs to be limited to avoid being too large or too small. 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 provided above the second mounting portion 33, and a limiting surface 26 provided 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 limit member 35 includes a limit block 351 detachably mounted on the second main body portion 31 and a gasket 352 adjusted at a height of the limit block 351 relative to the second main body portion 31. The limit block 351 is a consumable part made of elastic rubber or other materials, which not only plays a role in shock absorption and buffering, but also adjusts the limit height by setting the number of gaskets 352 to meet different design requirements and compensate for the wear of the limit block 351.

[0052] On the other hand, see Appendix Figure 6 The lower portion 423 of the second pull rod is located on the inner side or the outer side of the second main body portion 31, and the upper portion 421 of the second pull rod is bent outward or inward, so that the upper portion 421 of the second pull rod and the second main body portion 31 are located on the same vertical plane, and the bending transition area between the upper portion 421 of the second pull rod and the lower portion 423 of the second pull rod is the avoidance portion 422. When the second pull rod 42 and the second main body portion 31 rotate relative to each other and the relative rotation angle is small, the avoidance portion 422 does not contact the second main body portion 31. When the rotation angle of the second pull rod 42 and the second main body portion 31 is too large, interference will occur between the avoidance portion 422 and the second main body portion 31, thereby realizing a self-limiting effect and avoiding excessive activity of the chain link 4.

[0053] See attached Figure 3 A reinforcing rib plate 313 is also provided between the two plate bodies 311. Part of the reinforcing rib plate 313 is provided on the movement trajectory of the second pull rod 42. Part of the reinforcing rib plate 313 is defined as a limiting area 314. When the rotation angle of the second pull rod 42 is greater than the threshold value, the second pull rod 42 will rotate counterclockwise with the pin shaft 312 as the rotation point until it collides with the limiting area 314 of the reinforcing rib plate 313. At this time, the triangular crawler assembly 100 reaches the maximum activity, thereby ensuring the structural stability and driving stability of the tractor.

[0054] See attached Figure 1 , 2 The idler wheel includes 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 supporting rollers include a first supporting roller 6a and a second supporting roller 6b provided on the third mounting portion 34. The crawler track 7 is wound across the driving wheel 1, the first idler wheel 5a, the first supporting roller 6a, the second supporting roller 6b and the second idler wheel 5b, so that the rotation of the driving wheel 1 causes the crawler track 7 to move.

[0055] See attached Figure 7 The supporting wheels include a supporting frame 62 mounted on the third mounting portion 34 and capable of swinging along its supporting shaft 61. The first supporting wheel 6a and the second supporting wheel 6b are respectively mounted at the front and rear ends of the supporting frame 62, so that the first supporting wheel 6a and the second supporting wheel 6b can change along a direction perpendicular to the axial direction of the supporting shaft 61 (i.e., the forward direction) as the terrain changes, thereby achieving a secondary contour-like shock-absorbing effect.

[0056] See attached Figure 8 The supporting shaft 61 includes a shaft body 611, a spherical portion 612 arranged in the middle position of the shaft body 611, and a swing body 613 wrapped with the spherical portion 612 and made of elastic material. The elastic material can be a rubber material. The supporting frame 62 is provided with a sleeve portion 621, and the sleeve portion 621 is sleeved on the swing body 613. When the crawler track 7 is displaced along the axial direction (i.e., the inner and outer directions) of the first and second rollers 6a, 6b of the supporting shaft 61, the swing body 613 will be deformed, so that the first and second rollers 6a, 6b change along the inner and outer directions with the change of the terrain, thereby realizing the contour-like shock-absorbing function. At the same time, the plasticity of the swing body 613 can also reduce the impact of ground changes on the tractor.

[0057] See attached Fig. 9 The inner surface of the rocking body 613 is fitted with the spherical portion 612, the outer circumference of the middle area of ​​the rocking body 613 is a cylindrical surface 6131, which is clamped between the retaining spring 66 and the annular step 6211, and the outer circumference of the two end areas of the rocking body 613 is a conical surface 6132, and the connecting part between the conical surface 6132 and the cylindrical surface 6131 is a transition surface 6133, so that the thickness of the rocking body 613 at the two ends is roughly the same as the thickness of the rocking body 613 in the middle, ensuring that the rocking body 613 has roughly the same radial stiffness, thereby improving the deformation uniformity of the entire rocking body 613.

[0058] A conical notch portion 6134 is formed at both end surfaces of the rocking body 613, through which part of the internal stress in the rubber compression deformation process is released, and the flow deformation in the circumferential outer surface is changed, thereby avoiding bulging, excessive deformation and other problems on the two end surfaces of the rocking body 613, reducing the axial deformation of the rocking body 613 after compression, and ensuring that the rocking body 613 will not interfere with the shaft body 611 during the load-bearing process.

[0059] Attachment Fig.10 The first end cover 63 and the second end cover 64 are respectively provided at the two end surfaces of the swing body 613, and the inner contour of the first end cover 63 and the inner contour of the first end cover 63 are both adapted to the outer contour of the swing body 613, that is, the transition surfaces 6133 at both ends of the cylindrical surface 6131 extend to the end surface of the swing body 613. The first end cover 63 and the second end cover 64 are used to constrain the circumferential outer surface at both ends of the swing body 613, so as to avoid radial bulging of the rubber layer within the normal load range, thereby improving the reliability and stability of the swing body 613.

[0060] Specifically, an annular step 6211 and an annular groove 6212 are provided on the inner surface of the sleeve portion 621. A retaining spring 66 is clamped on the annular groove 6212. A spacer 65, a first end cover 63, a swing body 613 and a second end cover 64 are fixed in sequence from the retaining spring 66 to the annular step 6211. The user can adjust the distance between the first end cover 63 and the second end cover 64 by replacing the spacer 65 with different thicknesses, thereby adjusting the initial axial length of the swing body 613, thereby adjusting the variable stiffness of the swing body 613 and realizing wear compensation of the swing body 613.

[0061] It will be apparent to those skilled in the art that various modifications and variations may be made to the above 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 covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A triangular crawler assembly for a tractor, characterized in that: The front side is the direction of the tractor's forward movement, and the inner side is the side close to the tractor body, including: A driving wheel, the driving wheel being arranged on the output shaft of the tractor drive axle; An upper bracket, the upper bracket comprising a first main body portion fixedly mounted on the tractor body and located outside the driving wheel; A lower bracket, the lower bracket comprising a second main body portion disposed below the first main body portion, a first mounting portion located at a front end of the second main body portion, a second mounting portion located at a rear end of the second main body portion, and a third mounting portion located in a middle portion of the second main body portion, the front end of the first main body portion being rotatably connected to the front end of the second main body portion, and the front end of the first main body portion being rotatably connected to the front end of the second main body portion; A chain link, wherein the 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 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, the idler wheel comprising a first idler wheel mounted on the first mounting portion and a second idler wheel mounted on the second mounting portion; Supporting rollers, the supporting rollers comprising a first supporting roller and a second supporting roller disposed on the third mounting portion; A track is wrapped across the drive wheel, the first idler wheel, the first roller, the second roller, and the second idler wheel so that rotation of the drive wheel causes movement of the track.

2. The triangular crawler track assembly for a tractor according to claim 1, characterized in that: A mounting base is fixedly mounted on the end cover of the drive axle, the output shaft passes through the mounting base and is fixedly mounted on the mounting base through a bearing, and a first frame part and a second frame part are respectively provided at the front and rear ends of the first main body part, and the first frame part and the second frame part are fixedly mounted on the mounting base.

3. The triangular crawler track assembly for a tractor according to claim 2, characterized in that: The first frame portion is arranged along the front of the outer edge of the driving wheel and extends to the outside of the driving wheel and is fixedly connected to the front end of the first main body portion. The second frame portion is arranged along the rear of the outer edge of the driving wheel and extends to the outside of the driving wheel and is fixedly connected to the rear end of the first main body portion.

4. The triangular crawler track assembly for a tractor according to claim 1, characterized in that: The supporting roller also includes a supporting frame installed on the third installation portion and capable of swinging along its supporting axis, and the first supporting roller and the second supporting roller are respectively installed at the front end and the rear end of the supporting frame.

5. The triangular crawler track assembly for a tractor according to claim 4, characterized in that: The support shaft comprises a shaft body, a spherical part arranged in the middle of the shaft body, and a swing body wrapped with the spherical part and made of elastic material. The support frame is provided with a sleeve part, and the sleeve part is sleeved on the swing body.

6. The triangular crawler track assembly for a tractor according to claim 5, characterized in that: The two end surfaces of the rocking body are respectively provided with a first end cover and a second end cover, and the inner contour of the first end cover and the inner contour of the first end cover are both adapted to the outer contour of the rocking body, and the inner surface of the sleeve portion is provided with an annular step and an annular groove, and a retaining spring is clamped on the annular groove, and a spacer, a first end cover, a rocking body and a second end cover are fixed in sequence from the retaining spring to the annular step.

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

8. The triangular crawler track assembly for a tractor according to claim 1, characterized in that: The second main body includes two plates and a pin shaft arranged 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 an avoidance portion, so that the upper part of the second pull rod and at least one plate body are located on the same vertical plane. When the rotation angle of the second pull rod is greater than a threshold value, the avoidance portion will interfere with the plate body.

9. The triangular crawler track assembly for a tractor according to claim 8, characterized in that: A reinforcing rib plate is also provided between the two plates, and a partial area of ​​the reinforcing rib plate is provided on the movement track of the second pull rod. When the rotation angle of the second pull rod is greater than a threshold value, the second pull rod will interfere with a partial area of ​​the reinforcing rib plate.

10. A tractor, characterized in that: It comprises the triangular crawler assembly as described in any one of claims 1 to 9.

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