Track driving tooth block, track driving assembly and working machine

Abstract

The utility model relates to a track driving tooth block, a track driving assembly and an operation machine. The crawler belt driving tooth block comprises a tooth part and a main body part, the main body part is provided with a plurality of mounting holes distributed in the circumferential direction of the main body part, and the main body part is mounted to a hub providing rotation driving force for driving a crawler belt to walk through a plurality of fasteners penetrating through the mounting holes. The plurality of mounting holes comprise two side holes and at least one middle hole, and the distance from each side hole to the corresponding end edge of the main body part is smaller than the distance between two adjacent mounting holes in the circumferential direction. A first gap where the side hole is matched with the fastener of the side hole is larger than a second gap where the middle hole is matched with the fastener of the middle hole, so that when the main body part and the hub slide relatively, the middle hole and the fastener corresponding to the middle hole abut against the side hole and the fastener corresponding to the side hole. According to the track driving tooth block, the track driving tooth block borne at the middle hole is more difficult to break than the track driving tooth block borne at the side holes, so that the service life of the track driving tooth block is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the field of crawler type working machinery, in particular to a crawler driving tooth block used for directly driving the crawler in the crawler type working machinery to travel. Background Art

[0002] For crawler-type working machinery (such as crawler bulldozers, crawler excavators, etc.), the crawler travel mechanism is an important ground-connected propulsion system, which has the advantages of good passability, good load-bearing performance, and large driving force. The crawler travel mechanism mainly includes crawlers and crawler drive components as the power output device of the final drive of the working machinery. The crawler drive components transmit the power of the engine to the crawler to drive the working machinery to move.

[0003] In the prior art, track drive assemblies are mainly divided into an integrated drive wheel type and a multi-stage drive gear block type. Since the replacement cost of an integrated drive wheel is too high, more and more crawler-type working machinery uses a multi-stage drive gear block. A track drive assembly of the multi-stage drive gear block type may include a wheel hub that provides a rotational driving force and a plurality of drive gear blocks that are evenly spaced on the periphery of the wheel hub, and each drive gear block is fixedly mounted on the periphery of the wheel hub by fasteners such as bolts. However, in actual use, it is found that the track drive assembly of the multi-stage drive gear block type is prone to the problem of drive gear block breakage, and the broken drive gear block can no longer be used and needs to be replaced, which leads to an increase in the maintenance cost of the working machinery and a decrease in the working efficiency. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the above problems and / or other defects in the prior art.

[0005] To achieve the above-mentioned object, one aspect of the utility model provides a track drive tooth block, the track drive tooth block comprises a tooth portion for engaging with a track and a main body portion connected to the tooth portion, the main body portion is provided with a plurality of mounting holes arranged along its circumferential direction, and is mounted to a wheel hub providing a rotational driving force for driving the track to travel through a plurality of fasteners respectively passing through the plurality of mounting holes. The plurality of mounting holes comprises two side holes and at least one middle hole disposed between the two side holes in the circumferential direction, and the distance from each side hole to the corresponding end edge of the main body portion is less than the distance between two adjacent mounting holes in the circumferential direction. The side hole and the fastener passing through the side hole are matched with a first gap, and the middle hole and the fastener passing through the middle hole are matched with a second gap, wherein the first gap is larger than the second gap, so that when the main body portion and the wheel hub slide relative to each other, the middle hole and the fastener corresponding to it abut against each other before the side hole and the fastener corresponding to it abut against each other.

[0006] According to one embodiment of the present utility model, the at least one middle hole and the two side holes are arranged at equal intervals along the circumferential direction.

[0007] According to one embodiment of the present invention, the number of the middle hole is one.

[0008] According to one embodiment of the present invention, the diameter of the side hole is greater than the diameter of the middle hole.

[0009] According to an embodiment of the present invention, the plurality of fasteners include a plurality of bolts of the same specification.

[0010] According to an embodiment of the present invention, the tooth portion and the main body portion are formed integrally and a step portion extending in the circumferential direction is formed at their junction, and the step portion enables the main body portion to form a drop relative to the tooth portion for receiving the wheel hub.

[0011] According to an embodiment of the present invention, the number of teeth in the tooth portion is equal to the number of mounting holes and they are arranged in a one-to-one correspondence.

[0012] Another aspect of the utility model provides a track drive assembly, which includes a wheel hub that provides a rotational driving force for driving the track to move and a plurality of track drive gear blocks according to any one of the above items, the wheel hub is provided with a plurality of connecting holes distributed along its circumference, the plurality of track drive gear blocks are assembled along the circumference of the wheel hub and fixedly mounted on the wheel hub by the fasteners passing through the mounting holes and the corresponding connecting holes.

[0013] Another aspect of the present invention provides a working machine, which includes a crawler track and the crawler track drive assembly as described above.

[0014] In the crawler drive tooth block according to the utility model (also referred to as "drive tooth block" in this article), the distance from each side hole to the corresponding end edge of the main body is smaller than the distance between two circumferentially adjacent mounting holes, which indicates that the circumferential span of the material between the side hole and the corresponding end edge of the drive tooth block is smaller than the circumferential span of the material between the side hole and its adjacent middle hole or between two adjacent middle holes (that is, on both sides of any middle hole). Therefore, the circumferential force that the material of the drive tooth block between the side hole and the corresponding end edge can withstand will be smaller than the circumferential force that the material of the drive tooth block between the side hole and its adjacent middle hole or between two adjacent middle holes (that is, on both sides of any middle hole). In the case that the main body of the drive tooth block slides relative to the wheel hub or the fastener used to mount the drive tooth block on the wheel hub slips, the above-mentioned circumferential force is the rotational driving force transmitted from the wheel hub via the fastener to the corresponding mounting hole of the drive tooth block. The utility model designs the fitting clearance between the side hole and its fastener to be larger than the fitting clearance between the middle hole and its fastener, so that when the main body and the wheel hub slide relative to each other, the middle hole and its fastener can be ensured to abut against each other before the side hole and its fastener, so that the middle hole will be subjected to the circumferential force or rotational driving force applied by the corresponding fastener before the side hole. As mentioned above, the material of the driving tooth block on both sides of the middle hole can withstand a larger circumferential force than the material between the side hole and the corresponding end edge. Therefore, compared with the existing track driving tooth block, the track driving tooth block according to the utility model will be less likely to break between the side hole and the corresponding end edge due to the circumferential force applied by the fastener, thereby greatly extending the service life of the driving tooth block without changing the basic design configuration of the driving tooth block, and reducing the maintenance cost of the driving tooth block. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The features and advantages of the present invention will be clearly understood through the detailed description provided below with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and thus cannot be regarded as limiting the present invention, wherein:

[0016] Figure 1 It is a stereoscopic view of an exemplary crawler-type working machine to which the crawler drive assembly and crawler drive gear block according to the utility model can be applied.

[0017] Figure 2 Show Figure 1 A schematic diagram of an exemplary crawler traveling mechanism of a working machine is shown.

[0018] Figure 3 A schematic diagram of a crawler drive gear block according to an embodiment of the utility model is shown.

[0019] Description of reference numerals:

[0020] 200. Operating machinery; 210. Main frame; 220. Operator's cab; 230. Working machine; 235. Hydraulic cylinder; 240. Crawler travel mechanism; 1. Crawler drive assembly; 11. Wheel hub; 12. Crawler drive gear block; 121. Gear portion; 122. Main body; 1221. End edge; 123. Mounting hole; 124. Side hole; 125. Middle hole; 126. Step portion; 2. Guide wheel; 3. Supporting wheel; 4. Supporting wheel; 5. Crawler track; 6. Fasteners. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless clearly stated in the claims.

[0022] Figure 1 An exemplary work machine 200 is shown. The work machine 200 may be, for example, a crawler bulldozer as shown. The work machine 200 may also be any other type of crawler work machine that performs operations related to a specific industry (e.g., mining, construction, agriculture, transportation, etc.) and works and travels in various work environments (e.g., mines, construction sites, farms, roads, etc.), such as a crawler excavator, a crawler loader, etc.

[0023] The work machine 200 may include a main frame 210, a cab 220, and a work tool 230. Figure 1 In the embodiment of the present invention, the working tool 230 may be a blade assembly applied to a bulldozer. The working machine 200 may further include a hydraulic system having various hydraulic components, such as at least one hydraulic cylinder 235 operatively connected to the working tool 230 and used to control the movement of the working tool 230. A crawler travel mechanism 240 is arranged at the lower part of the working machine 200 to support and move the working machine 200.

[0024] Figure 2 Shown in side view Figure 1An exemplary configuration of a crawler travel mechanism of a working machine shown in FIG. The crawler travel mechanism, as a ground propulsion system, can drive the entire working machine to move forward and backward and turn. The crawler travel mechanism can mainly include a crawler drive assembly 1, a guide wheel 2, a supporting roller 3, a supporting roller 4 and a crawler 5. The crawler drive assembly 1 is a power output device of the working machine's final drive, which is engaged with the track chain of the crawler 5 to transmit the power output from the engine of the crawler working machine to the crawler 5, and is usually located at the rear of the working machine. The guide wheel 2 is usually located at the front of the working machine to guide the correct rotation of the crawler 5. The supporting roller 3 is arranged between the crawler drive assembly 1 and the guide wheel 2 to transfer the weight of the working machine to the ground. The supporting roller 4 supports the crawler 5 upward so that the crawler 5 has a certain tension.

[0025] Refer to the following Figure 2 and 3 The crawler drive assembly and crawler drive gear block involved in the utility model are described in detail. Figure 2 As shown, the track drive assembly 1 may include a wheel hub 11 and a plurality of track drive gear blocks 12. The wheel hub 11 may be connected to the output shaft of the travel motor of the final drive of the working machine, or connected to the output shaft of the reduction mechanism when the travel motor is connected to the reduction mechanism, so that the wheel hub 11 receives the power output from the travel motor and can provide a rotational driving force for driving the track to travel. The wheel hub 11 is provided with a plurality of connection holes (not shown) distributed along its circumference, and each drive gear block 12 is provided with a plurality of mounting holes. Each drive gear block 12 can be fixedly mounted on the wheel hub 11 by passing a plurality of fasteners 6 such as bolts and studs through the corresponding connection holes and mounting holes and tightening them. A plurality of drive gear blocks 12 fixed on the wheel hub 11 can be assembled into a circle along the circumference of the wheel hub 11, thereby forming a track drive assembly 1 of a multi-stage drive gear block type. It can be understood that each of the multiple driving gear blocks 12 assembled along the circumference of the wheel hub 11 is centered on the axis of the wheel hub 11. Therefore, the circumference of the driving gear block 12 or its main body 122 described in this article is the direction defined by the circumference of the wheel hub 11 when it is fixedly installed on the wheel hub 11.

[0026] Figure 3 The basic design configuration of the drive gear block 12 is shown. Figure 3 As shown, the driving gear block 12 may include a tooth portion 121 and a main body portion 122. A plurality of teeth are evenly spaced on the radial outer side of the tooth portion 121 for engaging (meshing) with the meshing teeth on the track shoe of the track. The main body portion 122 is connected to the radial inner side of the tooth portion 121 and is provided with a plurality of mounting holes 123. The plurality of mounting holes 123 are arranged at intervals along the circumference of the main body portion 122 and are provided for a plurality of fasteners 6 to pass through one by one.

[0027] Furthermore, the plurality of mounting holes 123 of the driving gear block 12 may include: Figure 3 The side holes 124 are located on the left and right sides respectively, and at least one middle hole 125 is disposed between the two side holes 124. The side hole 124 refers to a mounting hole disposed adjacent to one of the two end edges (referred to as "end edges") 1221 of the main body 122 of the driving gear block 12 in the circumferential direction among the multiple mounting holes of the driving gear block 12, and the middle hole 125 refers to the remaining mounting holes disposed between the two side holes 124 in the circumferential direction. For example, in Figure 3 In the embodiment shown, only one middle hole 125 is disposed between two side holes 124. Figure 2 It is shown that each driving gear block 12 has a total of five mounting holes, wherein three middle holes 125 are arranged at intervals between two side holes 124 .

[0028] As mentioned above, the existing crawler drive gear block with the above basic design configuration has the defect of being easy to break. The utility model aims to solve this problem.

[0029] After careful observation, the inventors found that the locations where the existing track drive gear blocks break are often near the end edge 1221 of the drive gear block body 122, basically located between the end edge and the side hole 124 adjacent to the end edge.

[0030] On the other hand, the inventors have realized after research that the driving gear block 12 is installed on the wheel hub 11 through a plurality of fasteners 6 (typically bolts). Only when the bolts are tightened sufficiently can sufficient friction be generated between the driving gear block 12 and the wheel hub 11 to transmit the circumferential rotational driving force from the wheel hub to the driving gear block. If the bolts are not tightened enough during initial installation or gradually loosen due to factors such as vibration during operation, the bolt connection strength will be insufficient, causing the driving gear block 12 and the wheel hub 11 to slide relative to each other due to insufficient friction. Finally, the rotational driving force acting on each bolt in the form of shear force can only be transmitted between the wheel hub 11 and the driving gear block 12 by the bolts inserted into each mounting hole 123 of the driving gear block 12. The rotational driving force transmitted from the wheel hub 11 via each bolt directly acts on the hole wall of each mounting hole 123, and is thus transmitted to the driving gear block 12. The inventors thus infer that the huge force applied to the driving gear block 12 by the slipped bolt fastener 6 through the hole wall of the mounting hole 123 is the cause of the breakage of the driving gear block.

[0031] As to why the fracture often occurs near the end edge 1221 of the driving gear block main body 122 and the corresponding side hole 124, the inventors have noticed that in the driving gear block 12, if Figure 3As shown, the distance from each side hole 124 to the corresponding end edge 1221 is smaller than the distance between two circumferentially adjacent mounting holes 123 (i.e., the distance between the side hole 124 and its adjacent middle hole 125 or the distance between two adjacent middle holes 125). This is to avoid the main body 122 from warping near the two end edges 1221 after the drive gear block 12 is installed on the wheel hub 11 when the number of mounting holes 123 is constant. In this way, the circumferential span of the material of the driving tooth block 12 between the side hole 124 and the corresponding end edge 1221 is smaller than the circumferential span of the material of the driving tooth block 12 between the side hole 124 and its adjacent middle hole 125 or between two adjacent middle holes 125 (that is, on both sides of any middle hole 125). Therefore, the strength of the material of the driving tooth block 12 between the side hole 124 and the corresponding end edge 1221 or the circumferential force that can be withstood will be smaller than the strength of the material of the driving tooth block 12 between the side hole 124 and its adjacent middle hole 125 or between two adjacent middle holes 125 (that is, on both sides of any middle hole 125). As a result, the driving tooth block 12 is more likely to break near the end edge 1221 and the corresponding side hole 124 due to the rotational driving force applied by the slipping fastener 6.

[0032] Based on the above research and analysis of the causes of the fracture of the existing drive gear block, the present invention conceives a corresponding solution, that is, the first clearance between the side hole 124 on the drive gear block 12 and the fastener 6 passing through the side hole is set to be larger than the second clearance between the middle hole 125 on the drive gear block 12 and the fastener 6 passing through the middle hole, so that when the main body 122 of the drive gear block 12 slides relative to the wheel hub 11, the middle hole 125 and its corresponding fastener 6 abut against each other before the side hole 124 and its corresponding fastener 6. In this way, the middle hole 125 will bear the circumferential force or rotational driving force applied by the corresponding fastener 6 before the side hole 124, and because the material of the drive gear block on both sides of the middle hole 125 has a larger circumferential span and strength than the material between the side hole 124 and the corresponding end edge 1221 as described above, the drive gear block that bears the load at the middle hole first than at the side hole according to the present invention will be less likely to fracture.

[0033] In order to realize the first gap and the second gap that are different from each other, the diameters of the side holes 124 and the middle holes 125 and / or the specifications (mainly the diameters) of the fasteners 6 corresponding to them can be set. For example, the diameter of the side hole 124 can be set to be larger than the diameter of the middle hole 125. In this case, each mounting hole 123, that is, the side hole 124 and the middle hole 125 can use fasteners 6 of the same specifications to realize that the first gap is larger than the second gap, which is conducive to improving the versatility of parts and saving costs. Figure 3Taking the driving gear block 12 with three teeth and a pitch of 228 mm as an example, the diameter of the three bolt mounting holes required in the industry standard JB / T11011 is 26.5 mm. According to one embodiment, the diameter of the middle hole 125 can be maintained at 26.5 mm, while the diameter of the side hole 124 is increased to 27 mm, so that the purpose of the first gap being larger than the second gap can be achieved when the fasteners 6 passing through the side hole 124 and the middle hole 125 are both bolts of the same specification. Alternatively, in theory, the side hole 124 and the middle hole 125 with the same diameter can also be set, but the fasteners 6 passing through the side hole 124 and the middle hole 125 respectively must adopt different specifications (diameters). More specifically, the diameter of the fastener passing through the side hole 124 can be smaller than the diameter of the fastener passing through the middle hole 125, so as to achieve that the first gap is larger than the second gap. Of course, both fasteners themselves need to meet the strength requirements.

[0034] Continue to refer Figure 3 , multiple mounting holes 123 can be arranged on the same circumference and at equal intervals. That is, the spacing between the middle hole 125 and the side hole 124 and between each adjacent middle hole 125 (when there are more than two middle holes 125) in the circumferential direction is the same, so as to ensure that when the driving gear block 12 and the wheel hub 11 are connected by the fastener 6, the driving gear block 12 can be evenly fastened to the wheel hub 11 to prevent slippage caused by uneven force.

[0035] The number of the intermediate holes 125 is not particularly limited, and can be one, two or more, which can be set according to factors such as the circumferential length of each driving gear block 12 and the magnitude of the rotational driving force to be transmitted by each driving gear block. Figure 3 The one shown in the figure can increase the distance between the middle hole 125 and the side hole 124, thereby increasing the strength of the middle part of the main body 122. In addition, the number of mounting holes 123 including the middle hole 125 can be equal to the number of teeth in the tooth portion 121 and be arranged one by one.

[0036] like Figure 3 As shown in FIG. 1 , the tooth portion 121 can be formed integrally with the main body portion 122, and a step portion 126 extending in the circumferential direction is formed at their junction. Figure 3 The side surface seen in FIG. 1 is sunken into the main body 122 via the step portion 126. Figure 3 In other words, the step portion 126 forms a drop in the main body portion 122 relative to the tooth portion 121, and the drop can be used to receive the wheel hub 11 so that the drive gear block 12 can be fixedly installed on the outer periphery of the wheel hub 11 through the mounting holes 123 and the fasteners 6.

[0037] Industrial Applicability

[0038] The crawler drive tooth block according to the utility model can be used in various crawler working machines (including but not limited to crawler bulldozers, crawler excavators, crawler loaders, etc.) to form a multi-stage drive tooth block type crawler drive assembly. Figure 2 and 3 The illustrated embodiment is taken as an example to specifically describe the general steps and working process of installing the track drive gear block 12 onto the wheel hub 11 of the track drive assembly 1.

[0039] First, align the middle hole 125 of a driving gear block 12 with one of the connection holes of the wheel hub 11, and also align the two side holes 124 with their respective corresponding connection holes. Then, pass a plurality of fasteners 6 through the middle hole 125 and the corresponding connection holes and through the side holes 124 and the corresponding connection holes and fasten them, thereby installing the driving gear block 12 in place against the outer periphery of the wheel hub 11. Subsequently, the remaining driving gear blocks 12 are installed one by one on the wheel hub 11 in the above manner, and are assembled into a circle along the circumference of the wheel hub 11, thereby completing the assembly of the multi-stage driving gear block type crawler drive assembly 1.

[0040] When the working machine is working, the rotational driving force is output from the wheel hub 11 of the crawler drive assembly 1. The tightening action of the fastener 6 generates a sufficiently large friction force between the wheel hub 11 and each driving tooth block 12. The rotational driving force from the wheel hub 11 is transmitted to each driving tooth block 12 through the friction force, and then transmitted to the crawler through the tooth portion 121 of each driving tooth block 12, thereby making the working machine move.

[0041] If the fastener 6 is not tightened enough during the initial installation or gradually loosens due to factors such as vibration during the operation of the operating machine, the driving tooth block 12 and the wheel hub 11 will slide relative to each other due to insufficient friction, and the loose fastener 6 will also slip in the mounting hole 123, and finally the rotational driving force can only be transmitted between the wheel hub 11 and the driving tooth block 12 by the fastener 6 abutting against the hole wall of the corresponding mounting hole. However, in the driving tooth block according to the utility model, by designing the matching clearance between the side hole and its fastener to be larger than the matching clearance between the middle hole and its fastener, it can be ensured that the middle hole and its fastener abut before the side hole and its fastener when the driving tooth block and the wheel hub slide relative to each other, so that the middle hole with higher peripheral strength bears the rotational driving force applied by the corresponding fastener before the side hole with lower peripheral strength, so the driving tooth block according to the utility model is less likely to break. Therefore, the utility model greatly prolongs the service life of the driving tooth block without changing the basic design configuration of the driving tooth block, and reduces the maintenance cost of the driving tooth block.

[0042] For those skilled in the art, various modifications and variations may be made to the embodiments disclosed above without departing from the scope or spirit of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from the practice of the utility model disclosed in this specification. This specification and the examples disclosed therein should be considered to be illustrative only, and the true scope of the utility model is specified by the appended claims and their equivalents.

Claims

1. A crawler drive tooth block (12), comprising a tooth portion (121) for engaging with a crawler track and a main body portion (122) connected to the tooth portion, the main body portion being provided with a plurality of mounting holes arranged along its circumference, and being mounted to a wheel hub (11) providing a rotational driving force for driving the crawler track to travel by means of a plurality of fasteners (6) respectively passing through the plurality of mounting holes (123), wherein the crawler drive tooth block (12) is characterized in that: The plurality of mounting holes (123) include two side holes (124) and at least one middle hole (125) disposed between the two side holes in the circumferential direction, and the distance between each side hole (124) and the corresponding end edge (1221) of the main body (122) is smaller than the distance between two adjacent mounting holes (123) in the circumferential direction. The side hole (124) is matched with the fastener (6) passing through the side hole with a first clearance, and the middle hole (125) is matched with the fastener (6) passing through the middle hole with a second clearance. in, The first gap is larger than the second gap, so that when the main body (122) and the hub (11) slide relative to each other, the middle hole (125) and its corresponding fastener (6) come into contact before the side hole (124) and its corresponding fastener (6).

2. The crawler drive gear block (12) according to claim 1, characterized in that: The at least one middle hole (125) and the two side holes (124) are arranged at equal intervals along the circumferential direction.

3. The crawler drive gear block (12) according to claim 1, characterized in that: The number of the middle hole (125) is one.

4. The crawler drive gear block (12) according to any one of claims 1 to 3, characterized in that: The diameter of the side hole (124) is greater than the diameter of the middle hole (125).

5. The crawler drive gear block (12) according to claim 4, characterized in that: The plurality of fasteners (6) include a plurality of bolts of the same specification.

6. The crawler drive gear block (12) according to any one of claims 1 to 3, characterized in that: The tooth portion (121) and the main body portion (122) are formed integrally, and a step portion (126) extending in the circumferential direction is formed at their junction, and the step portion (126) enables the main body portion (122) to form a drop relative to the tooth portion (121) for receiving the wheel hub (11).

7. The track drive gear block (12) according to claim 6, characterized in that: The number of teeth in the tooth portion (121) is equal to the number of the mounting holes (123), and they are arranged in a one-to-one correspondence.

8. A crawler drive assembly, characterized in that: It comprises a wheel hub (11) providing a rotational driving force for driving a crawler track to travel and a plurality of crawler drive gear blocks (12) according to any one of claims 1 to 7, wherein the wheel hub (11) is provided with a plurality of connecting holes distributed along its circumference, and the plurality of crawler drive gear blocks (12) are assembled along the circumference of the wheel hub (11) and fixedly mounted on the wheel hub (11) by means of the fasteners (6) passing through the mounting holes (123) and the corresponding connecting holes.

9. A working machine, characterized in that: It comprises a crawler track (5) and a crawler track drive assembly according to claim 8.

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