Crawler block, crawler assembly and crawler bogie

Abstract

In the field of crawler block technology, a crawler block, a crawler assembly, and a crawler-type bogie are provided. [Solution] The crawler block includes a crawler block body 1 and a connecting portion 3, the bottom and top surfaces of which are respectively configured as a crawler surface 11 and an assembly surface 12, two adjacent crawler blocks are rotatably connected via a connecting portion on the assembly surface, the connecting portion including a first shaft hole body 31 and a second shaft hole body 32 which can fit together to form a hinged structure, the connecting portion and the crawler block body are integrally molded, the holes of the first shaft hole body and the second shaft hole body are split shaft holes, and the split shaft hole includes at least two stages of semi-enclosed hole walls, and the two adjacent stages of semi-enclosed hole walls form offset vertical or relative support surfaces.

Description

[Technical Field]

[0001] The present invention relates to the field of crawler block technology, and more particularly to a crawler block, a crawler assembly, and a crawler-type bogie. [Background technology]

[0002] Due to its excellent terrain adaptability, high reliability, high-efficiency transmission performance and easy maintenance, the hinged crawler has a relatively wide application prospect in complex operating conditions and harsh environments.

[0003] However, in the prior art, the hinge holes of hinged crawlers are generally formed by machining. For example, invention patent application number "CN117048729A" discloses a crawler plate assembly, crawler device, chassis, and work machine. The crawler plate assembly includes a crawler plate body and crawler links, each including a left link plate and a right link plate, which are opposed to each other and are integrally molded on a first plate surface of the crawler plate body. The left link plate and the right link plate each have a pin shaft hole on one side located at the intersection of the pair of first link plate portions, and a pin shaft passes through the pin shaft hole to connect two adjacent crawler links. The pin shaft holes are generally formed by machining (e.g., milling or drilling), which is relatively difficult to process. Ensuring the concentricity of the pin shaft holes requires the use of high-precision equipment, which increases production costs. If general equipment is used for processing, it is difficult to ensure concentricity, and the processing precision is low, resulting in low assembly precision between the crawler pin and the hinge coupling hole, which further leads to the following problems: 1. Unstable crawler operation Uneven wear and abnormal wear: If the precision of the hinge connection hole is low, the force bearing of the link will be uneven, accelerating wear on one side (such as the pin shaft, bushing, crawler link, etc.) and shortening the service life of the entire crawler. Risk of wheel coming off: If the precision of the hinge connection hole is insufficient, the meshing between the crawler and the drive wheel or guide wheel may become poor, and in extreme cases, this may cause the crawler to come off. 2. Increased equipment vibration and noise If the clearance between the hinge coupling hole and the crawler pin is too large or the centering is poor, it will cause an impact load, generate severe vibration and abnormal noise, affect the operating comfort, and even damage other related components. 3. Decrease in transmission efficiency Frictional resistance increases (for example, sticking due to misalignment of the shaft bore), causing power loss. 4. Fatigue damage to structural components Localized stress concentrations (e.g., cracks in crawler links, breakage of pin shafts) can cause a chain reaction, ultimately leading to the breakage of the crawler chain and threatening work safety. 5. Skyrocketing maintenance costs Frequent replacement of damaged parts (e.g. bushings, pin shafts) increases inspection time, significantly increasing maintenance costs in the long run.

[0004] Therefore, the present invention provides a crawler block with a hinge hole designed as an integral part, which has high processing precision and is useful for improving the assembly precision between the crawler pin and the hinge hole, thereby improving the stability and service life of the crawler.However, some crawler blocks in the prior art have protrusions on both sides, which cause the hinge hole to be interfered with when cored from the side, thereby limiting the production of crawler blocks to some extent. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention solves the problems in the related art and provides a crawler block, crawler assembly, and crawler bogie that can effectively improve processing precision and assembly precision, thereby improving the stability and service life of the crawler, and avoiding interference during core drilling, thereby avoiding the need for machining using high-precision equipment and effectively reducing production costs. [Means for solving the problem]

[0006] To solve the above technical problems, the present invention is realized by the following technical solutions:

[0007] a crawler block including a crawler block body and a connecting portion, the bottom and top surfaces of which respectively constitute a crawler surface and an assembly surface, two adjacent crawler blocks being rotatably connected via the connecting portion on the assembly surface, the connecting portion being able to fit together to form a hinged structure, and a first shaft hole body and a second shaft hole body, wherein the connecting portion and the crawler block body are integrally molded, the holes of the first shaft hole body and the second shaft hole body are split shaft holes, the split shaft hole including at least two stages of semi-enclosed hole walls, and the two adjacent stages of semi-enclosed hole walls form offset vertical or opposing support surfaces.

[0008] According to one embodiment of the present invention, the mounting surface is provided with stopper protrusions, which are provided on both sides of the connecting portion, and the stopper protrusions are used to limit the movement range of the crawler wheels.

[0009] According to one embodiment of the present invention, the crawler block body, the stopper protrusion and the connecting portion are formed as an integral structure.

[0010] According to one embodiment of the present invention, the connection portions of two adjacent crawler blocks are rotatable along the crawler pin, and the rotation axis of the two adjacent crawler blocks does not protrude beyond the edge of the crawler block body of one of the crawler blocks.

[0011] According to one embodiment of the present invention, the first bore body includes three semi-encircling bore walls, the opening directions of the semi-encircling bore walls located on both sides are the same and perpendicular to the assembly surface, and the opening direction of the intermediate semi-encircling bore wall is parallel to the assembly surface.

[0012] According to one embodiment of the present invention, the second bore body includes two independent split bores, each of which includes two semi-enclosed bore walls, and the opening directions of the two semi-enclosed bore walls are both perpendicular to the mounting surface.

[0013] According to one embodiment of the present invention, a transition groove is formed on the mounting surface, and the transition groove is located on one side of the mating location between the first shaft bore body and the second shaft bore body.

[0014] According to one embodiment of the present invention, a dirt discharge groove is provided on the crawler surface, and the dirt discharge groove includes a plurality of tooth-shaped dirt discharge grooves distributed at intervals on the front side of the crawler surface and a long dirt discharge groove provided in the central part of the crawler surface, and two dirt discharge ports of the long dirt discharge groove are located at the left and right ends of the crawler surface, and the two dirt discharge ports are connected via a corrugated passage.

[0015] In order to achieve the above object, the present invention further provides a crawler assembly.

[0016] A crawler assembly includes a plurality of crawler blocks as described above, the plurality of crawler blocks being connected head to tail, and the first shaft hole body and the second shaft hole body of adjacent crawler blocks being connected via a crawler pin.

[0017] In order to achieve the above object, the present invention further provides a crawler type carriage.

[0018] A crawler assembly includes the crawler assembly and a gear train as described above, the crawler assembly mating with the gear train.

[0019] According to one embodiment of the present invention, the wheel train includes a crawler wheel located in the center of the crawler assembly and tension wheels located at both ends of the crawler assembly, and the edges of the crawler wheel and tension wheels are both provided with anti-slip grooves that fit into the stopper protrusions of the crawler block. [Effects of the Invention]

[0020] Compared with the prior art, the present invention has the following advantageous effects: the present invention installs the first and second shaft hole bodies forming a hinged structure in a split shaft hole, and installs the split shaft hole in multiple stages of semi-enclosed hole walls, thereby forming offset vertical or relative support surfaces on two adjacent stages of semi-enclosed hole walls, making it easy to integrally form the hinged hole using a mold, effectively improving processing accuracy and assembly accuracy, and thereby improving the stability and service life of the crawler; even if there are protrusions on both sides of the crawler block, the installation of the semi-enclosed hole walls can effectively prevent interference from the protrusions, thereby providing strong design adaptability for different crawler blocks; and the crawler block can be produced using a mold, avoiding the need for machining using high-precision equipment and effectively reducing production costs. [Brief explanation of the drawings]

[0021] [Figure 1] 3A to 3C are schematic structural diagrams of a crawler block according to an embodiment of the present invention in different directions. [Figure 2] 3A to 3C are schematic structural diagrams of a crawler block according to an embodiment of the present invention in different directions. [Figure 3] 1 is a schematic diagram illustrating the connection of two adjacent crawler blocks in one embodiment of the present invention. [Figure 4] FIG. 2 is a bottom view of the crawler block according to the embodiment of the present invention. [Figure 5] 1 is a structural schematic diagram of a crawler assembly according to an embodiment of the present invention; [Figure 6] FIG. 6 is a partial enlarged view of the circle A in FIG. 5. [Figure 7] 1 is a schematic diagram of the structure of a crawler-type bogie according to an embodiment of the present invention; [Figure 8] 3 is a schematic diagram of the interlocking structure between the crawler assembly and the gear train in one embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0022] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and does not constitute any limitation on the present invention and its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work are also within the scope of protection of the present invention.

[0023] 1 to 3, a crawler block according to one embodiment of the present invention includes a crawler block body 1, an optional stopper protrusion 2, and a connecting portion 3, of which the bottom and top surfaces of the crawler block body 1 respectively form a crawler surface 11 and an assembly surface 12, and two adjacent crawler blocks are rotatably connected via the connecting portion 3 on the assembly surface 12. Specifically, the connecting portion 3 includes a first shaft hole body 31 and a second shaft hole that can fit together to form a hinged structure.

[0024] To facilitate the integral molding of the connecting part 3 and the crawler block body 1, the first shaft hole body 31 and the second shaft hole body are arranged in a split shaft hole, and the split shaft hole includes at least two stages of semi-encircling hole walls, with adjacent two stages of semi-encircling hole walls forming offset vertical or relative support surfaces, so that the crawler pin 4 can hinge adjacent crawler blocks together via the semi-encircling hole walls (as shown in Figure 3). Specifically, the connecting part 3 and the crawler block body 1 can be integrally molded by methods such as mold casting or injection molding, and are not limited to these in this embodiment.

[0025] In this way, in the process of molding the connecting part 3 and the crawler block body 1 of the crawler block of the present invention, core punching can be performed directly along the opening direction of the semi-enclosed hole wall that forms the split shaft hole, avoiding interference with other structures in the crawler block body 1, such as the stopper protrusions 2, during core punching. The design is more adaptable to different crawler blocks, and compared with machining using conventional equipment, the machining precision is higher, which helps to improve the assembly precision between the crawler pin and the hinge coupling hole, thereby improving the stability and service life of the crawler. Furthermore, the crawler block can be produced using a mold, eliminating the need for machining using high-precision equipment, and effectively reducing production costs.

[0026] As will be understood, the connection part 3 can not only be a connection structure between two adjacent crawler blocks, but can also be used to restrict the position of the crawler wheel between the crawler assemblies. For example, patent number "201280011302.8" and an invention patent entitled "Crawler-Type Traveling Mechanism" discloses a crawler block, in which a curved driving surface is designed at the connection part of the crawler block and bonded to the shape of the crawler wheel edge in order to limit the movement range of the crawler wheel, so that not only does the connection part have to bear pressure and wear from the crawler wheel during crawler travel, but the crawler pin connecting the connection part of two adjacent crawler blocks also bears pressure from the crawler wheel. In particular, when the crawler steers or overcomes an obstacle, the crawler pin must simultaneously be subjected to multiple compound stress actions such as radial shear force, axial torsional load, and impact vibration, and the local contact stress may exceed the fatigue limit of the material, causing plastic deformation and contact fatigue cracks on the surface, accelerating damage to the crawler pin and shortening its service life. Furthermore, the crawler block can be produced using a mold, eliminating the need for machining using high-precision equipment, and effectively reducing production costs.

[0027] In one embodiment of the present invention, stopper protrusions 2 may be provided on the assembly surface 12, and the stopper protrusions may be provided on both sides of the connection portion 3, and are used to limit the movement range of the crawler wheel, so that when the crawler wheel and the crawler block are mated, the stopper protrusions 2 and the assembly surface 12 are mainly subjected to pressure from the crawler wheel.

[0028] In this way, the crawler block of the present invention has stopper protrusions 2 on the assembly surface 12, which limits the range of movement of the crawler wheel and prevents the connection part 3 from being directly subjected to pressure from the crawler wheel, thereby reducing the stress between the top of the crawler pin 4 and the connection part 3. The misaligned support surface formed by multiple stages of semi-enclosed hole walls between the first shaft hole body 31 and the second shaft hole body 32 can distribute the load to multiple contact points within the split shaft hole, reducing local wear and ensuring the service life of the crawler pin 4.

[0029] In one embodiment of the present invention, the crawler block body 1, the stopper protrusions 2, and the connecting parts 3 may be formed as a single unit, thereby ensuring the strength of the crawler block. In other embodiments of the present invention, the crawler block body 1, the stopper protrusions 2, and the connecting parts 3 may be fixed together by welding, adhesive, or other methods according to actual needs, and are not limited to this embodiment.

[0030] In one embodiment of the present invention, the connection parts 3 of two adjacent crawler blocks can rotate along the crawler pins 4. To prevent the gap between the two adjacent crawler blocks from being too large, which could cause foreign objects such as soil and sand to get caught between the two crawler blocks and affect the normal running of the crawler, the rotation axis of the two adjacent crawler blocks can be installed so that it does not protrude beyond the edge of the crawler block body 1 of one of the crawler blocks, thereby reducing the gap between the opposing surfaces of the adjacent crawler blocks.

[0031] As shown in FIG. 2 , in one embodiment of the present invention, the first bore body 31 may include three semi-encircling bore walls, i.e., the first semi-encircling bore wall 31a, the second semi-encircling bore wall 31b, and the third semi-encircling bore wall 31c. The semi-encircling bore walls located on both sides, i.e., the first semi-encircling bore wall 31a and the third semi-encircling bore wall 31c, have the same opening direction and are perpendicular to the assembly surface 12. The intermediate semi-encircling bore wall, i.e., the second semi-encircling bore wall 31b, has an opening direction parallel to the assembly surface 12. Therefore, in this embodiment, even if the outermost end of the first bore body 31 does not extend beyond the edge of the assembly surface 12, core punching can be performed along the opening direction of the semi-encircling bore walls (31a, 31b, 31c). There is no need to consider whether the stopper protrusion 2 or other structures on the assembly surface 12 will affect the normal performance of core punching. In some other embodiments of the present invention, other methods that do not require core drilling, such as the lost wax method, can be used to integrally mold the crawler block, and the opening direction of the first semi-encircling hole wall 31a and the third semi-encircling hole wall 31c located on both sides does not have to be perpendicular to the assembly surface 12, the opening direction of the second semi-encircling hole wall 31b located in the middle does not have to be parallel to the assembly surface 12, and the opening direction of the first semi-encircling hole wall 31a and the third semi-encircling hole wall 31c located on both sides can be in a direction different from the opening direction of the semi-encircling hole wall 31b located in the middle, and is not limited in this embodiment.

[0032] As shown in FIG. 2 , in one embodiment of the present invention, the second bore body 32 may include two independent split bores 321, so that the two independent split bores 321 can respectively distribute the stress between the crawler pin and the connection part 3 to both sides of the first bore body 31. The two independent split bores 321 may each include two semi-encircling bore walls, i.e., a fourth semi-encircling bore wall 321a and a fifth semi-encircling bore wall 321b, and the opening directions of the two semi-encircling bore walls (321a, 321b) are both perpendicular to the assembly surface 12.

[0033] It can be understood that, when the opening directions of the semi-encircling hole walls (321a, 321b) of the second shaft hole body 32 and the opening directions of the semi-encircling hole walls (31a, 31c) located on both sides of the first shaft hole body 31 are all perpendicular to the assembly surface 12, these six semi-encircling hole walls can be simultaneously cored, which simplifies mold design, reduces production costs, and improves production efficiency. In some other embodiments of the present invention, the opening directions of the fourth semi-encircling hole wall 321a and the fifth semi-encircling hole wall 321b can be set according to actual needs and are not limited in this embodiment.

[0034] As shown in FIG. 3, in one embodiment of the present invention, the mounting surface 12 may further include a transition groove 121, which is located on one side of the fitting point between the first shaft bore body 31 and the second shaft bore body 32. The transition groove 121 provides a certain amount of movement space for the two adjacent crawler blocks, making it easier for the crawler blocks to self-adaptively adjust their posture during travel, and reducing wear between the adjacent crawler blocks and between the crawler blocks and the travel surface.

[0035] As shown in Figure 4, in one embodiment of the present invention, dirt discharge grooves may be provided on the crawler surface 11 to prevent foreign matter such as soil and sewage from affecting the normal running of the crawler. Specifically, the dirt discharge grooves may include a plurality of tooth-shaped dirt discharge grooves 111 spaced apart on the front side of the crawler surface 11 and a long dirt discharge groove 112 provided in the center of the crawler surface 11, with two dirt discharge ports 112a located on the left and right ends of the crawler surface 11 and connected by a corrugated passage 112b. The tooth-shaped dirt discharge groove 111 can discharge foreign matter between two adjacent crawler blocks, and the long dirt discharge groove 112 can discharge foreign matter on the crawler surface 11 through the dirt discharge ports on both sides, improving the grip of the crawler blocks against the running surface and preventing crawler slippage.

[0036] In order to achieve the above object, the present invention further provides a crawler assembly.

[0037] As shown in Figures 5 and 6, the crawler assembly of the embodiment of the present invention includes a plurality of crawler blocks 10 as described above, which are connected head to tail, and the first shaft hole body 31 and the second shaft hole body 32 of adjacent crawler blocks 10 are connected via a crawler pin 4.

[0038] The crawler assembly according to the embodiment of the present invention includes the crawler blocks as described above, and therefore also has the beneficial effects described above.

[0039] In order to achieve the above object, the present invention further provides a crawler type carriage.

[0040] 7 and 8, a crawler-type bogie according to an embodiment of the present invention includes a crawler assembly and a wheel train as described above, with the crawler assembly interlocking with the wheel train. Specifically, the wheel train may include a crawler wheel 20 located in the center of the crawler assembly and tension wheels 30 located at both ends of the crawler assembly. The edges of the crawler wheel 20 and tension wheels 30 may be provided with anti-slip grooves that interlock with the stopper protrusions 2 of the crawler block 10, i.e., crawler wheel anti-slip grooves 201 and tension wheel anti-slip grooves 301, so that the positions of the crawler wheel 20 and tension wheels 30 can be restricted by the anti-slip grooves (201, 301) and the stopper protrusions 2 on the crawler block 10. In some other embodiments of the present invention, guide wheels may be provided at one or both ends of the crawler assembly instead of tension wheels, and this embodiment is not limited thereto.

[0041] The crawler-type carriage according to the embodiment of the present invention includes the crawler assembly as described above, and therefore also has the beneficial effects described above.

[0042] In describing the invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of said features. "Plurality" means two or more, unless expressly and specifically qualified otherwise.

[0043] In the present invention, unless otherwise clearly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be mechanically connected or electrically connected. They may be directly connected, or indirectly connected via an intermediate medium, or may refer to communication between two components or an interactive relationship between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0044] In this invention, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact with each other, or that the first and second features are in indirect contact with each other via an intermediate medium. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than that of the second feature.

[0045] In the description herein, when a description refers to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the description herein, general descriptions using the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, if not mutually inconsistent, those skilled in the art may combine and combine different embodiments or examples described herein and features of different embodiments or examples.

[0046] Although the above has shown and described embodiments of the present invention, it should be understood that the above embodiments are illustrative and should not be construed as limiting the present invention, and that those skilled in the art may change, modify, substitute, and change the above embodiments within the scope of the present invention. [Explanation of symbols]

[0047] 1 crawler block body, 11 crawler surface, 111 tooth-shaped dirt discharge groove, 112 dirt discharge long groove, 112a dirt discharge port, 112b wave-shaped passage, 12 assembly surface, 121 transition groove, 2, stopper protrusion, 3, connection portion, 31 first shaft hole body, 31a first semi-enclosed hole wall, 31b second semi-enclosed hole wall, 31c third semi-enclosed hole wall, 32 second shaft hole body, 321 independent split shaft hole, 321a fourth semi-enclosed hole wall, 321b fifth semi-enclosed hole wall, 4 crawler pin, 10 Crawler block, 20 Crawler wheel, 201 Crawler wheel anti-slip groove, 30 Tension wheel, 301 Tension wheel anti-slip groove.

Claims

1. 1. A crawler block comprising a crawler block body (1) and a connection portion (3), wherein the bottom and top surfaces of the crawler block body (1) are configured as a crawler surface (11) and an assembly surface (12), respectively, two adjacent crawler blocks are rotatably connected via the connection portion (3) on the assembly surface (12), and the connection portion (3) includes a first shaft hole body (31) and a second shaft hole body (32) that can fit together to form a hinged structure, wherein the connection portion (3) and the crawler block body (1) are integrally molded, the holes of the first shaft hole body (31) and the second shaft hole body (32) are split shaft holes, and the split shaft holes include at least two stages of semi-encircling hole walls, and the two adjacent stages of semi-encircling hole walls form offset vertical or relative support surfaces.

2. 2. The crawler block according to claim 1, characterized in that stopper protrusions (2) are provided on the assembly surface (12), the stopper protrusions (2) are provided on both sides of the connection portion (3), and the stopper protrusions (2) are used to limit the movement range of the crawler wheels.

3. 3. The crawler block according to claim 2, wherein the crawler block body (1), the stopper projection (2), and the connecting portion (3) are of an integrally molded structure.

4. 2. The crawler block according to claim 1, wherein the connection portions (3) of two adjacent crawler blocks are rotatable along the crawler pin (4), and the rotation axes of the two adjacent crawler blocks do not protrude from an edge of the crawler block body (1) of one of the crawler blocks.

5. 2. The crawler block according to claim 1, wherein the first shaft hole body (31) includes three stages of semi-encircling hole walls, the opening directions of the semi-encircling hole walls located on both sides are the same and perpendicular to the assembly surface (12), and the opening direction of the intermediate semi-encircling hole wall is parallel to the assembly surface (12).

6. 2. The crawler block according to claim 1, wherein the second shaft hole body (32) includes two independent split shaft holes (321), each of the two independent split shaft holes (321) includes two stages of semi-encircling hole walls, and the opening directions of the two stages of semi-encircling hole walls are both perpendicular to the assembly surface (12).

7. 2. The crawler block according to claim 1, characterized in that a transition groove (121) is opened in the assembly surface (12), and the transition groove (121) is located on one side of the mating point between the first shaft hole body (31) and the second shaft hole body (32).

8. 2. The crawler block according to claim 1, wherein a dirt discharge groove is provided in the crawler surface (11), the dirt discharge groove including a plurality of tooth-shaped dirt discharge grooves (111) distributed at intervals on the front side of the crawler surface (11) and a long dirt discharge groove (112) provided in the center of the crawler surface (11), the two dirt discharge ports (112a) of the long dirt discharge groove (112) being located at both left and right ends of the crawler surface (11), and the two dirt discharge ports (112a) being connected via a corrugated passage (112b).

9. A crawler assembly comprising a plurality of crawler blocks (10) according to any one of claims 1 to 8, wherein the plurality of crawler blocks (10) are connected head to tail in sequence, and the first shaft hole body (31) and the second shaft hole body (32) of adjacent crawler blocks (10) are connected via a crawler pin (4).

10. A crawler-type bogie comprising the crawler assembly and a gear train according to claim 9, wherein the crawler assembly is fitted with the gear train, and the gear train includes a crawler wheel (20) located in the center of the crawler assembly and tension wheels (30) located at both ends of the crawler assembly.

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