Track systems and construction machinery

Abstract

The utility model relates to a crawler track system and an engineering machinery including the crawler track system. The crawler track system includes at least one main chain rail segment and a plurality of common chain rail segments connected in series to form a ring, and includes a plurality of track shoes connected to each chain rail segment, wherein the track shoes include a main section track shoe connected to the main chain rail segment through a main section plate connecting device, and a common section track shoe connected to the common chain rail segment through a common section plate connecting device, wherein the main section plate connecting device has the same type of structure as the common section plate connecting device, and has a greater connection strength than the common section plate connecting device. The crawler track system of the utility model reduces the possibility of loosening of the main section plate connecting device by increasing the connection strength of the main section plate connecting device, thereby avoiding damage to the main chain rail segment.

Description

Technical Field

[0001] The utility model relates to the technical field of parts of engineering machinery, in particular to a crawler system and an engineering machinery comprising the crawler system. Background Art

[0002] The crawler track is usually formed by connecting a plurality of track links in series via pins, and is usually annular in order to be used as a transmission component, for example. An annular crawler track is known which is formed by connecting a plurality of ordinary track links in series and at least one main track link, wherein the main track link may be formed by connecting a plurality of detachable or removable articulated link bodies via main link bolts, so that the crawler track can be easily installed and removed by removing the main link bolts.

[0003] A sealed lubricated crawler is known, in which a pin shaft for connecting adjacent track links has a sealed hollow space and a lubricant is contained in the hollow space. Due to its advantages in structure and lubrication method, this sealed lubricated crawler is increasingly used in chassis crawlers of engineering machinery, which can significantly increase the service life of the chassis crawler and reduce maintenance costs. In addition, due to the presence of its main track link, it also greatly facilitates the disassembly and assembly of the crawler.

[0004] However, due to the special structure and high installation requirements, there are transverse shear forces between the multiple detachable or removable chain links of the main chain rail. When multiple chain links are fixed by main link bolts, these transverse shear forces will be transmitted to the main link bolts, increasing the probability of the main link bolts loosening. If the main link bolts are not discovered in time after loosening, it will eventually lead to damage to the main chain rail. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a crawler system. The crawler system can provide a higher connection strength for the main chain rail segment than that of the ordinary chain rail segment, so as to significantly improve the connection reliability of the main chain rail segment and reduce the failure rate of the main section plate connection device, thereby avoiding damage to the main chain rail segment due to failure of the connection device.

[0006] Specifically, the utility model provides a crawler system, which includes at least one main chain track segment and multiple common chain track segments connected in series to form a ring, and includes multiple track plates connected to each chain track segment, wherein the main chain track segment includes a left main segment and a right main segment constructed in a mirror-symmetrical manner and arranged spaced apart in a transverse direction, the left main segment includes a first left hinge and a second left hinge that can be split along a vertical direction perpendicular to the transverse direction, and the right main segment includes a first right hinge and a second right hinge that can be split along the vertical direction; each common chain track segment includes a left chain track segment and a right chain track segment constructed in a mirror-symmetrical manner and spaced apart in the transverse direction, the track plates include a main-section track plate connected to the main chain track segment through a main-section plate connecting device, and a common-section track plate connected to the common chain track segment through a common-section plate connecting device, wherein the main-section plate connecting device has a structure of the same type as the common-section plate connecting device, and has a connection strength greater than that of the common-section plate connecting device.

[0007] Advantageously, the main joint plate connection device is configured to also connect the first left joint to the second left joint and / or the first right joint to the second right joint.

[0008] Advantageously, the main section plate connection device comprises main section plate connection bolts, and the common section plate connection device comprises common section plate connection bolts, wherein the main section plate connection bolts have a diameter and / or length greater than that of the common section plate connection bolts.

[0009] Advantageously, the main section plate connecting bolts and the common section plate connecting bolts are both composed of bolts of standard sizes.

[0010] Advantageously, the first left joint and the second left joint fit together and each have teeth and tooth grooves that can mesh with each other; the first right joint and the second right joint fit together and each have teeth and tooth grooves that can mesh with each other.

[0011] Advantageously, the left main section includes a left coupling hole extending along the direction in which the first left joint and the second left joint are fitted together, and the right main section includes a right coupling hole extending along the direction in which the first right joint and the second right joint are fitted together, and both the left coupling hole and the right coupling hole are configured to receive the main section plate connecting device.

[0012] The utility model also provides an engineering machine, which comprises the crawler system as described above. Advantageously, the engineering machine is a bulldozer.

[0013] The crawler system of the utility model increases the connection strength of the main section plate connection device to cope with the higher installation requirements of the main chain track due to the structural particularity, and improves the connection reliability of the main section plate connection device, thereby reducing the possibility of the main section plate connection device loosening and avoiding damage to the main chain track. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The features and advantages of the present disclosure 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 only schematic and not necessarily drawn to scale, and thus cannot be regarded as limiting the present disclosure, wherein:

[0015] Figure 1 A side view of a construction machine according to an exemplary embodiment of the present disclosure is shown.

[0016] Figure 2 is a perspective view of a crawler system according to a preferred embodiment of the utility model;

[0017] Figure 3 yes Figure 1 A three-dimensional diagram of the track system without the track shoes;

[0018] Figure 4 yes Figure 1 An exploded view of the main link rail section in FIG.

[0019] Figure 5 Figure 1 Exploded view of a common track link in . DETAILED DESCRIPTION

[0020] Embodiments of the present disclosure 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, it is contemplated that any combination of the features and elements described below may be used 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 explicitly stated in the claims.

[0021] In the following, terms such as "first", "second", etc. are used to describe the elements of the present application. These terms are only used to distinguish the various elements, and are not used to limit the nature, order or number of these elements. The terms "including" and "having" are used to express an open-ended inclusive meaning, and mean that there may be additional elements / components in addition to the listed elements / components.

[0022] See also Figure 1 , in which a construction machine 100 including a track system is shown. The construction machine 100 is shown as a tracked tractor, but it may also be a tracked bulldozer, an excavator, a loader, or any of a variety of other machines. The construction machine 100 may include a track system 110, which may be one of two separate track systems arranged on opposite sides of a frame 120 of the construction machine 100 in a conventional manner. The track system 110 may include a track roller frame 130 connected to the frame 120 and a plurality of rotatable track engaging elements 140, 150, and 160. In one embodiment, the track engaging elements 140 and 150 may be rotatable idler wheels that are passively rotated during operation of the track system 110, and the track engaging element 160 may be a drive wheel for driving the track system 110, which may have teeth for engaging and, in particular, interposing between the track links of the track system. The track system 110 may further include a plurality of track rollers 170 mounted to the track roller frame 130. The track system 110 may further include a track 180 extending around the track engaging elements 140, 150 and 160 and the track rollers 170. The track 180 may include a plurality of pairs of track segments (at least one pair of master track segments and a plurality of pairs of common track segments) and a plurality of track shoes 181 connected to the pairs of track segments. The track rollers 170 may abut against the master track segments 1 and / or the common track segments 2 adjacent thereto.

[0023] Figure 2 and Figure 3 A crawler system according to an embodiment of the present invention is shown, wherein Figure 3 Track shoe 3 removed. Figure 2 and Figure 3 The crawler system may include at least one main track link 1, a plurality of common track links 2, a plurality of track shoes 3 connected to the main track links 1 and the common track links 2 one by one, a main track shoe connection device 4, and a common track shoe connection device 5. The main track link 1 and the common track link 2, and two adjacent common track links 2 may be connected in series at the corresponding ends through a pin 6. For example, a plurality of common track links 2 may be connected in series via the pin 6 to form one or more long chain-like crawlers 180, and the two ends of the one or more long chain-like crawlers 180 may be connected or connected in the first place via one or more main track links 1 to form a ring crawler 180.

[0024] Figure 4 The main chain track section 1 according to an embodiment of the utility model is shown. Figure 4As shown, the main chain track section 1 may include a left main section 11 and a right main section 12. The left main section 11 and the right main section 12 may be constructed in a mirror-symmetrical manner and arranged spaced apart in the transverse direction. The left main section 11 may include an elongated substrate extending approximately in a longitudinal direction perpendicular to the transverse direction, the substrate may include a first end and a second end, the first end and the second end may both be formed with holes, the second end is offset in the transverse direction toward the side where the right main section 12 is located relative to the first end, thereby forming a generally inverted Z-shaped overall profile. Similarly, the right main section 12 may also include an elongated substrate extending approximately in the longitudinal direction, the substrate may include a first end and a second end each formed with a hole, the second end is offset in the transverse direction toward the side where the left main section 11 is located relative to the first end, thereby forming a generally inverted Z-shaped overall profile.

[0025] It can be understood that the directions in this article are defined with reference to the directions generally used for engineering machinery, wherein the lateral direction refers to the left and right direction of the engineering machinery, i.e. Figure 2 The longitudinal direction refers to the front and rear direction of the construction machinery. Figure 2 The left and right direction in the text refers to the vertical direction of the construction machinery, that is, Figure 2 The up and down directions in .

[0026] The left main section 11 and the right main section 12 can be connected at their first ends by a pin 6 (see Figure 3 ) and can be connected at their second ends by a sleeve 7 (see Figure 4 ) are connected to form the main chain track section 1. In particular, Figure 3 As can be seen in the figure, the left and right main sections 11, 12 are constructed so that when they are connected by the pin 6 and the bushing 7, the distance between them at the first end (that is, the first end of the main chain track section 1) is greater than the distance between them at the second end (that is, the second end of the main chain track section 1).

[0027] Continue to refer Figure 4 Preferably, the left main section 11 may include a first left hinge (also called a "buckle") 111 and a second left hinge 112. The first and second left hinges 111, 112 may be formed by independent components, which may be attached to each other in a face-to-face manner, and may be assembled together in a manner that allows them to be split in a vertical direction perpendicular to the transverse direction (i.e., the direction separating the left and right main sections 11, 12) to form the left main section 11.

[0028] As described above, as a component of the left main section 11, one end of the first left joint 111 (corresponding to the first end of the main chain track section 1) can be offset relative to the end of the second left joint 112 opposite to or away from it in the longitudinal direction (corresponding to the second end of the main chain track section 1), and each has a hole 113, 114. These holes 113, 114 can be used as the end holes of the left main section 11 for receiving the above-mentioned pin 6 and sleeve 7 respectively.

[0029] In this case, preferably, the first and second left joints 111, 112 may have surfaces facing and contacting each other, also referred to as "fitting surfaces". One of the fitting surface of the first left joint 111 and the fitting surface of the second left joint 112 may include a toothed portion, and the other may include a tooth groove portion adapted to the toothed portion. The toothed portion and the tooth groove portion may be constructed and arranged so that the protruding teeth of the toothed portion can be engaged with the recessed tooth grooves of the tooth groove portion. Such a configuration is beneficial to the positioning and engagement of the first and second left joints 111, 112, as well as the stability and reliability of the engagement of the two.

[0030] Advantageously, the left main section 11 may include a left engaging hole 115 for connecting the first left joint 111 with the second left joint 112. Figure 4 As shown (two left joint holes 115 are shown), the left joint hole 115 can penetrate at least one left joint (for example, Figure 4 The first left joint 111 located at the top of the left joint 111) and extends into another left joint (eg Figure 4 The left joint hole 115 can be configured to receive a portion of the second left joint 112 located below. The left joint hole 115 can be configured to receive a portion of the second left joint 112 located below. Figure 2 ) of the main section plate connecting device 4. Preferably, the left engaging hole 115 can be configured as a hole at least partially with threads.

[0031] The right main section 12 may include a first right hinge 121 and a second right hinge 122. Figure 4 As shown, the first right hinge 121 may include a hole 123 at its end (corresponding to the first end of the main chain rail 1) and a toothed portion (or toothed portion) on its mating surface; the second right hinge 122 may include a hole 124 at its end (corresponding to the second end of the main chain rail 1) and a toothed portion (or toothed portion) on its mating surface. The right main section 12 may also include a right engaging hole 125 that passes through the first right hinge 121 and passes through at least a portion of the second right hinge 122. Since the structure of the right main section 12 is similar to that of the left main section 11, it will not be described in detail.

[0032] Figure 5 An embodiment of a common track link is shown. As shown in the figure, the common track link 2 may include a left track link 21 and a right track link 22 constructed in a mirror-symmetrical manner. Both the left track link 21 and the right track link 22 may include an elongated base extending generally in the longitudinal direction, and the base may include a first end and a second end both of which are formed with holes. For the left track link 21, its second end is offset relative to its first end toward the side where the right track link 22 on the opposite side is located. Similarly, for the right track link 22, its second end is also offset relative to its first end toward the side where the left track link 21 on the opposite side is located. As a result, the distance separating the left track link 21 and the right track link 22 at the first end (that is, the first end of the common track link 2) is greater than the distance separating them at the second end (that is, the second end of the common track link 2). Thus, the left track link 21 and the right track link 22 are connected at their first ends by a pin 6 (see Figure 3 ) and can be connected at their second ends by a shaft sleeve 7, thereby forming a common track segment 2. It can be understood that the pin 6 and shaft sleeve 7 used in the common track segment 2 and the main track segment 1 are selected according to actual needs and can be of the same specifications or different specifications.

[0033] The left track link 21 may be a one-piece component made by molding, or may be a one-piece component made by fixing, for example, welding, a plurality of parts together. Similarly, the right track link 22 may be a one-piece component made by molding, or may be a one-piece component made by fixing, for example, welding, a plurality of parts together.

[0034] Similar to the main chain link 1, the left chain link 21 and the right chain link 22 of the common chain link 2 have a larger spacing between their ends ( Figure 5 The left end of the middle track link 2 can be called the first end of the common track link 2, and the end with a smaller spacing between the left track link 21 and the right track link 22 ( Figure 5 The right end in the middle of the figure can be called the second end of the common track link 2.

[0035] according to Figure 2 In the embodiment shown in , the second end of the common track segment 2 is connected to the first end of the main track segment 1 through a pin 6, wherein the left track segment 21 is located on the lateral inner side of the left main segment 11, and the right track segment 22 is located on the lateral inner side of the right main segment 12, and the pin 3 passes through the holes at the ends of the left main segment 11, the left track segment 21, the right track segment 22 and the right main segment 12, as shown in FIG. Figure 2 As shown in A in the middle.

[0036] Of course, the first end of the common track segment 2 can also be connected to the second end of the main track segment 1 through the pin 6. In this case, the left and right track segments 21, 22 of the common track segment 2 will be located laterally outside the left and right main segments 11, 12 of the main track segment 1, respectively. Figure 2 As shown in B.

[0037] refer to Figure 2 , the track shoe 3 may include a main section track shoe 31 and a common section track shoe 32. The main section track shoe 31 is connected to the left main section 11 and the right main section 12 of the main chain track segment 1 via the main section track shoe connecting device 4. The common section track shoe 32 is connected to the left chain track segment 21 and the right chain track segment 22 of the common chain track segment 2 via the common section track shoe connecting device 5. Here, it should be pointed out that the main section track shoe 31 and the common section track shoe 32 may have substantially the same structure, for example, they are composed of track shoes of the same batch of the manufacturer, and the difference lies only in their connection structure adapted to the main section track shoe connecting device 4 or the common section track shoe connecting device 5 (for example, the size of the hole for receiving the bolt).

[0038] According to the utility model, the main section plate connecting device 4 and the common section plate connecting device 5 can have the same type of structure but different specifications, so that the main section plate connecting device 4 has a greater connection strength than the common section plate connecting device 5. Thus, the higher installation requirements and strength requirements of the main chain rail section can be met. Here, "same type" means that the main section plate connecting device 4 and the common section plate connecting device 5 have the same structure in realizing the connection function, for example, both have the same type of fastening connector, such as bolts.

[0039] According to an exemplary embodiment of the main section plate connection device 4, reference Figure 2 The main section plate connecting device 4 may include a plurality of main section plate connecting bolts, which may pass through the main section plate mounting holes (not visible in the figure) correspondingly arranged on the main section track shoe 31 and be inserted into the base of the main chain track section 1. Figure 2 As can be seen in the figure, the main section plate connecting device 4 may include four main section plate connecting bolts, which may be arranged in pairs in an aligned manner and connect the main section track shoe 31 to the left main section 11 and the right main section 12 respectively.

[0040] Of course, the main section plate connecting device 4 may also include other numbers and arrangements of main section plate connecting bolts, or include other forms of connecting parts, such as rivets, studs, locking pins, etc., as long as the main section track plate 31 and the main chain track section 1 can be fixed together.

[0041] Advantageously, the main section plate connecting device 4 can be configured to connect the main section track shoe 31 with the main chain track segment 1 while also connecting the corresponding joints of the main chain track segment 1 (i.e., the first left joint 111 and the first right joint 112 of the left main section 11, and the first right joint 121 and the second right joint 122 of the right main section 12). For example, when the main section plate connecting device 4 is formed by bolts, the bolts can be configured to pass through the main section plate mounting holes on the main section track shoe 31, and then pass through the left engaging hole 115 of the left main section 11 and / or the right engaging hole 125 of the right main section 12.

[0042] exist Figure 2 In the illustrated embodiment, the common segment plate connecting device 5 may include a plurality of common segment plate connecting bolts, which may pass through common segment plate mounting holes (not visible in the figure) correspondingly arranged on the common segment track shoe 32 and be inserted into the base of the common track link 2. The common segment plate connecting bolts may have the same or different number and / or arrangement as the main segment plate connecting bolts.

[0043] According to the utility model, the main section plate connecting bolt is constructed so that its strength is greater than the strength of the ordinary section plate connecting bolt. For example, it is conceivable to make the diameter and / or length of the main section plate connecting bolt greater than the diameter and / or length of the ordinary section plate connecting bolt. Alternatively, when the main section plate connecting bolt and the ordinary section plate connecting bolt are made of the same material, the strength of the main section plate connecting bolt can be increased by, for example, heat treatment or surface treatment. For another example, the connection strength of the main section plate connecting bolt can be improved by increasing the strength of the material constituting the main section plate connecting bolt.

[0044] Preferably, the main section plate connecting bolts and the common section plate connecting bolts are both made of bolts of standard size. For example, the specification of the main section plate connecting bolts is M22×1.5, the diameter of the main section plate mounting hole in the corresponding main section track shoe 31 is set to 22.5mm, and the left engaging hole 115 and the right engaging hole 125 in the main chain track section 1 are set to M22×1.5 threaded holes. In this case, the specification of the common section plate connecting bolts is M20×1.5, the diameter of the common section plate mounting hole in the corresponding common section track shoe 32 is set to 20.5mm, and the specification of the nut is M20×1.5.

[0045] In the above embodiment, the main segment plate mounting hole in the main segment track shoe 31 and the left and right engaging holes 125 in the main link track segment 1 can be at least partially threaded holes. The common segment plate mounting hole in the common segment track shoe 32 can also be at least partially threaded holes.

[0046] The utility model also provides an engineering machine comprising the above crawler system. The engineering machine may be a bulldozer.

[0047] Industrial Applicability

[0048] The crawler system according to the utility model is applicable to crawler-type engineering machinery, especially crawler bulldozers, crawler tractors, crawler excavators, crawler loaders or other engineering machinery that require crawler systems to support walking. It is understandable that the crawler system of the utility model can still be used in other equipment that requires crawler systems to support walking.

[0049] Below Figures 2 to 5 The embodiment shown specifically describes the assembly process of the crawler track system. First, the end of the first left joint 111 with a hole is placed on the lateral inner side of the first end of the left track segment 21 of the common track segment 2, and the end of the first right joint 121 with a hole is placed on the lateral inner side of the first end of the right track segment 22 of the common track segment 2. After the pin 6 passes through the left track segment 21, the first left joint 111, the first right joint 121 and the right track segment 22 by a press, the first left joint 111 and the first right joint 121 of the main track segment 1 can be connected to the first end of the first common track segment 2 (that is, the first end of the long chain-shaped crawler 180), and the sleeve 7 passes through the second ends of the left track segment 21 and the right track segment 22 by a press.

[0050] Then, multiple common track links 2 are assembled in sequence at the second end of the first common track link 2, thereby connecting the multiple common track links 2 in series to form a long chain-like crawler 180. At the second end of the last common track link 2 of the long chain-like crawler 180, the second left joint 112 is placed on the lateral outer side of the left track link 22, and the second right joint 122 is placed on the lateral outer side of the right track link 22. The second left joint 112 and the second right joint 122 of the main track link 1 can be connected to the second end of the last common track link 2 (that is, the second end of the long chain-like crawler 180) by passing the pin 6 through the second left joint 112, the left track link 21, the right track link 22, and the second right joint 122 by a press.

[0051] Finally, the fitting surface of the first left joint 111 is fitted with the fitting surface of the second left joint 112, and the fitting surface of the first right joint 121 is fitted with the fitting surface of the second right joint 122, so that the toothed portion and the corresponding tooth groove portion can be connected concavely and convexly, and the corresponding left engaging holes 115 are connected, and the corresponding right engaging holes 125 are connected. The main section plate mounting holes of the main section track shoe 31 are connected with the corresponding left engaging holes 115 and right engaging holes 125 respectively, and the main section plate connecting bolts are threadedly connected through the main section plate mounting holes and the left engaging holes 115, and through the main section plate mounting holes and the right engaging holes 125. The ordinary section plate connecting bolts are threadedly connected with the nuts after passing through the ordinary section plate mounting holes and ordinary chain track sections 2 (left chain track sections and right chain track sections) of the ordinary section track shoe 32. Thus, the assembly of the entire crawler system is completed.

[0052] In the prior art, the main chain rail section and the ordinary chain rail section in the crawler system use the same connecting device, and the mounting holes of the main section track plate and the ordinary section track plate use the same diameter, but the main chain rail section and the ordinary chain rail section have different stress conditions. Compared with the ordinary chain rail section, the main chain rail section needs to withstand a larger lateral shear force, which makes the connecting device (bolt or pin) used for the main chain rail section more easily loose or damaged. The crawler system of the utility model increases the connection strength of the main section plate connecting device 4 to cope with the higher installation requirements of the main chain rail section 1 due to the structural particularity. For example, by changing the material, diameter, length, etc. of the main section plate connecting bolts, the connection reliability of the main section plate connecting device can be improved. In this way, the possibility of loosening of the main section plate connecting device 4 is reduced, and damage to the main chain rail section 1 is avoided.

[0053] This description is for illustrative purposes only and should not be expected to limit the scope of the invention in any way. Therefore, those skilled in the art should understand that the disclosed specific embodiments may be modified in various ways without departing from the full and reasonable scope and spirit of the invention. Other aspects, features and advantages will become apparent from the accompanying drawings and the appended claims.

Claims

1. A crawler track system, comprising at least one main track segment (1) and a plurality of common track segments (2) connected in series to form a ring, and comprising a plurality of track shoes (3) connected to each track segment, wherein: The main chain rail section (1) comprises a left main section (11) and a right main section (12) which are constructed in a mirror-symmetrical manner and are arranged spaced apart in the transverse direction, the left main section (11) comprising a first left joint (111) and a second left joint (112) which can be split in a vertical direction perpendicular to the transverse direction, and the right main section (12) comprising a first right joint (121) and a second right joint (122) which can be split in the vertical direction; Each common track link (2) comprises a left track link (21) and a right track link (22) which are constructed in a mirror-symmetrical manner and are spaced apart in the transverse direction. It is characterized in that The track shoe (3) comprises a main track shoe (31) connected to the main chain track segment (1) via a main track shoe connecting device (4), and a common track shoe (32) connected to the common chain track segment (2) via a common track shoe connecting device (5). The main section plate connecting device (4) has the same type of structure as the common section plate connecting device (5), and has a greater connection strength than the common section plate connecting device (5).

2. The crawler system according to claim 1, characterized in that: The main joint plate connecting device (4) is configured to connect the first left joint (111) to the second left joint (112) and / or connect the first right joint (121) to the second right joint (122).

3. The crawler system according to claim 1 or 2, characterized in that: The main section plate connection device (4) comprises a plurality of main section plate connection bolts, and the common section plate connection device (5) comprises a plurality of common section plate connection bolts, wherein the main section plate connection bolts have a diameter and / or length greater than that of the common section plate connection bolts.

4. The crawler system according to claim 3, characterized in that: The main section plate connecting bolts and the common section plate connecting bolts are both composed of bolts of standard sizes.

5. The crawler system according to claim 1 or 2, characterized in that: The first left joint (111) and the second left joint (112) fit together and each have a toothed portion and a tooth groove portion that can mesh with each other; the first right joint (121) and the second right joint (122) fit together and each have a toothed portion and a tooth groove portion that can mesh with each other.

6. The crawler system according to claim 5, characterized in that: The left main section (11) includes a left engaging hole (115) extending along the direction in which the first left joint (111) and the second left joint (112) are fitted together, and the right main section (12) includes a right engaging hole (125) extending along the direction in which the first right joint (121) and the second right joint (122) are fitted together, and both the left engaging hole (115) and the right engaging hole (125) are configured to receive the main section plate connecting device (4).

7. An engineering machine, characterized in that: The construction machine comprises a crawler system according to any one of claims 1 to 6.

8. The construction machine according to claim 7, characterized in that: The engineering machinery is a bulldozer.

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