Transmission connection forge piece for bulldozer caterpillar band
By designing a combination of square grooves and circular through-holes on the bulldozer track links, the stress concentration problem was solved, the fatigue resistance and heat dissipation of the links were improved, and the amount of material used was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGSHU DARUN PRECISION MASCH CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-04-17
AI Technical Summary
The existing bulldozer track drive connecting forgings suffer from stress concentration under complex loads, leading to structural damage and insufficient fatigue resistance.
The design incorporates square grooves and circular through-holes along the longitudinal direction of the track on the chain link body, forming stress relief channels. Combined with chamfered structures and guide slopes, these features disperse stress, promote impurity discharge, and enhance heat dissipation performance.
It reduces the maximum tensile stress of the chain links by about 10-15%, delays crack initiation, improves fatigue resistance, reduces material usage, maintains structural strength, and effectively removes impurities and dissipates heat.
Smart Images
Figure CN224131172U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of transmission forgings for bulldozer tracks, and more specifically, it relates to a transmission connection forging for bulldozer tracks. Background Technology
[0002] In the field of heavy construction machinery such as bulldozers, the track drive system is a key component, and its performance directly affects the equipment's operating efficiency, stability, and service life. Bulldozer track drive connection forgings, as one of the core components of the track drive system, undertake important tasks such as transmitting power, connecting various parts of the track, and adapting to complex terrain changes.
[0003] Currently, among bulldozer track drive forgings on the market, the chain body is an extremely common and widely used transmission connection structure in existing bulldozer track drive technology. It typically consists of a series of hinged chain links, through which power is transmitted and the tracks are rotated. In actual bulldozer operation scenarios, the chain body needs to withstand complex loads from multiple sources. When the bulldozer is performing heavy-load bulldozing operations, the chain body must withstand enormous tensile forces to overcome soil resistance and move the earth; during equipment startup and braking, the chain body is subjected to instantaneous impact loads; and when the bulldozer is turning, the chain body must withstand torsional stress caused by changes in the friction between the tracks and the ground.
[0004] However, despite the widespread use of chains in existing technologies, they suffer from some significant shortcomings in structural design and mechanical performance, the most prominent being stress concentration. Traditional chain designs often lack sufficient consideration for the uniform distribution of stress under complex loads in terms of structural shape, connection points, and material distribution. Consequently, when subjected to these complex loads, stress cannot be evenly distributed throughout the chain structure, leading to a sharp increase in stress in certain localized areas, resulting in stress concentration. Utility Model Content
[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a transmission connection forging for bulldozer tracks that reduces stress concentration.
[0006] To achieve the above objectives, this utility model provides the following technical solution: comprising chain link bodies that are sequentially hinged along the track length direction;
[0007] A square groove extending longitudinally along the track is provided on the top of the non-ground contact side of the chain link body;
[0008] The top of the link body has a circular through-hole located in the center of the square groove;
[0009] Both sides of the chain link body are provided with chain docking installation ports. The chain docking installation ports are round holes and are used for the assembly and disassembly of multiple chain link bodies.
[0010] The combination of square grooves and circular through-holes forms a stress relief channel, which is used to disperse the alternating stress of the link body under complex working conditions.
[0011] By adopting the above technical solution, the combination structure of square groove and circular through-hole can reduce the maximum tensile stress at the edge of the pin hole by about 10% to 15%, delay the crack initiation time, and improve the fatigue resistance of the chain link.
[0012] The present invention is further characterized in that: the edges of the square grooves are all chamfered, and the inner diameter of the square grooves decreases sequentially from top to bottom.
[0013] By adopting the above technical solution, when the chain link is subjected to transverse shear force, the periphery of the square groove can undergo slight displacement, which transforms the shear stress into uniform deformation on both sides of the square groove, thus avoiding a sudden increase in stress in a local area.
[0014] The present invention is further configured such that: a guide slope is formed between the chamfered edge structure of the square groove and the circular through-hole, and the guide slope is used to form the main sludge discharge channel.
[0015] By adopting the above technical solution, when the chain link flips to non-ground contact, the soil slides down the guide slope under the action of gravity and centrifugal force. Even if it is partially blocked, the slope structure can still maintain more than 50% of the effectiveness of the sludge discharge channel.
[0016] The present invention is further configured such that: the top of the chain link body is provided with cuboid openings located on both sides of the square groove, and the cuboid openings penetrate the chain link body, and the cuboid openings can serve as secondary mud discharge channels.
[0017] By adopting the above technical solution, when the chain link flips to the non-ground contact side, impurities such as soil and gravel can slide down the guide slope of the square groove and the circular through-hole under the action of gravity and centrifugal force. The cuboid openings on both sides serve as secondary sludge discharge channels, allowing impurities that have not been completely discharged to fall from the openings, thus avoiding blockage of the main sludge discharge channel.
[0018] The present invention is further configured such that: the top of the link body is provided with a second slot located on both sides of the cuboid opening, and the shape of the second slot is a cuboid structure, and the corners of the second slot are right angle structures.
[0019] By adopting the above technical solution, traditional solid structures are prone to stress concentration at the edge of the chain connection joint. As a non-through blind slot, the material in the slot area can undergo slight elastic deformation when the chain link bends, absorbing part of the bending stress.
[0020] The present invention is further configured such that the edges of the cuboid opening and the square groove are both chamfered.
[0021] By adopting the above technical solutions, the design of cuboid openings, circular through-holes, and square slots can reduce the weight of the tracks and the amount of material used, while maintaining and increasing the strength of the structure.
[0022] This invention is further configured such that: the cuboid opening, the square groove, and the circular through-hole together form an airflow channel, which is used to improve the heat dissipation performance of the assembled link body.
[0023] By adopting the above technical solution, the square groove is used to promote air circulation and help cool the heat generated by the track during operation. The circular through-hole is used to further enhance airflow and reduce the high temperature generated by friction. The guide slope guides the air to form an air circulation along the circular through-hole, the square groove and the cuboid openings on both sides.
[0024] In summary, this application includes at least one of the following beneficial technical effects:
[0025] By setting square grooves and circular through-holes, the maximum tensile stress at the edge of the pin hole can be reduced by about 10% to 15%, delaying crack initiation time and improving the fatigue resistance of the chain link.
[0026] By incorporating a square groove, with its height being one-third the height of the link body and its width one-quarter the width of the link body, the rectangular shape of the square groove reduces material rigidity in the groove opening area while maintaining sufficient structural strength. When the link is subjected to lateral shear force, slight displacement can occur around the perimeter of the square groove, converting the shear stress into uniform deformation on both sides of the square groove, thus preventing a sudden increase in stress in localized areas.
[0027] By setting up cuboid openings, when the chain link flips to the non-ground contact side, impurities such as soil and gravel can slide down the guide slope of the square groove and the circular through-hole under the action of gravity and centrifugal force. The cuboid openings on both sides serve as secondary sludge discharge channels, allowing impurities that have not been completely discharged to fall from the openings, thus avoiding blockage of the main sludge discharge channels. Attached Figure Description
[0028] Figure 1 This is a front view of the overall structure of a transmission connection forging for bulldozer tracks according to this utility model;
[0029] Figure 2This is a side cross-sectional view of a transmission connection forging for bulldozer tracks according to the present invention.
[0030] Figure 3 This is a front cross-sectional view of a transmission connection forging for bulldozer tracks according to the present invention.
[0031] Figure 4 This is a partial cross-sectional three-dimensional structural view of a transmission connection forging for bulldozer tracks according to the present invention;
[0032] Figure 5 for Figure 4 Side view sectional structural diagram;
[0033] Figure 6 This is a side cross-sectional view of a transmission connection forging for bulldozer tracks according to the present invention.
[0034] Explanation of reference numerals in the attached diagram: 1. Link body; 11. Square groove; 12. Circular through-hole; 13. Chain docking and mounting port; 14. Cuboid opening; 15. Second groove. Detailed Implementation
[0035] It should be noted that, where there is no conflict, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0036] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0037] Please see Figure 1-4 The present invention provides the following technical solution:
[0038] Example 1, see Figures 1-6The system comprises chain link bodies 1, which are sequentially hinged along the track length. A square groove 11 extending longitudinally along the track is formed on the top of the non-ground contact side of the chain link body 1. A circular through-hole 12 located in the center of the square groove 11 is formed on the top of the chain link body 1. Chain docking ports 13 are formed on both sides of the chain link body 1. The chain docking ports 13 are circular holes and are used for the assembly and disassembly of multiple chain link bodies 1. The combination of the square groove 11 and the circular through-hole 12 forms a stress relief channel, which is used to disperse the alternating stress of the chain link body 1 under complex working conditions. Stress relief methods include three main approaches: geometric optimization, elastic deformation energy dissipation, and load path reconstruction. Our solution uses a combination of the square groove 11 and the circular through-hole 12, which is an improved design based on one of these approaches. This reduces the maximum tensile stress at the edge of the pin hole by approximately 10% to 15%, delays crack initiation, and improves the fatigue resistance of the chain link.
[0039] See Figures 2-4 The edges of the square groove 11 are all chamfered, and the inner diameter of the square groove 11 decreases from top to bottom. The height of the square groove 11 is one-third of the height of the link body 1, and the width of the square groove 11 is one-quarter of the width of the link body 1. The cuboid shape of the square groove 11 reduces the material rigidity in the groove area while maintaining sufficient structural strength. When the link is subjected to lateral shear force, the periphery of the square groove 11 can undergo slight displacement, converting the shear stress into uniform deformation on both sides of the square groove 11, thus avoiding a sudden increase in stress in a local area.
[0040] See Figures 3-6 The chamfered edge structure of the square groove 11 and the circular through-hole 12 form a guide slope, which is used to form the main mud discharge channel. The circular through-hole 12 and the square groove 11 have a dual function when the track is running. When the chain link flips to non-ground contact, the soil slides down along the guide slope under the action of gravity and centrifugal force. Even if it is partially blocked, the slope structure can still maintain more than 50% of the mud discharge channel effectiveness. In addition, the guide slope guides air to form an air circulation along the circular through-hole 12, the square groove 11 and the cuboid openings 14 on both sides, so that the surface temperature of the chain link is reduced by eight to twelve degrees Celsius compared with the solid structure.
[0041] See Figure 3 and Figure 4 When the chain link flips to the non-ground contact side, impurities such as soil and gravel can slide down the guide slope of the square groove 11 and the circular through-hole 12 under the action of gravity and centrifugal force. The cuboid openings 14 on both sides serve as secondary sludge discharge channels, allowing impurities that have not been completely discharged to fall from the openings, thus avoiding blockage of the main sludge discharge channels.
[0042] See Figures 4-5The top of the chain link body 1 has a second slot 15 located on both sides of the cuboid opening 14. The second slot 15 is cuboid in shape and has right angles at its corners. When the track chain rotates around the drive wheel and the idler wheel, the hinge of the chain link is subjected to high-frequency bending loads. Traditional solid structures are prone to stress concentration at the edge of the chain docking port 13. As a non-through blind slot, the material in the slot area of the second slot 15 can undergo slight elastic deformation when the chain link bends, absorbing part of the bending stress. This reduces the maximum tensile stress at the edge of the chain docking port 13 by about 10%, which can delay the initiation of fatigue cracks.
[0043] See Figure 4 The edges of the cuboid opening 14 and the square groove 11 are both chamfered. The cuboid opening 14, the circular through-hole 12 and the square groove 11 can reduce the weight of the track and reduce the use of materials, while maintaining and increasing the strength of the structure. The circular through-hole 12 is used to disperse stress and can avoid the weak points of the chain link body 1 caused by the slot.
[0044] See Figure 4 The cuboid opening 14, square groove 11, and circular through-hole 12 together form an airflow channel, which improves the heat dissipation performance of the assembled chain link body 1. The square groove 11 promotes airflow and helps cool the heat generated by the track during operation. The circular through-hole 12 further enhances airflow and reduces the high temperature generated by friction. The guide slope guides the air to circulate along the circular through-hole 12, square groove 11, and cuboid openings 14 on both sides, reducing the surface temperature of the chain link by eight to twelve degrees Celsius compared to a solid structure. The central circular through-hole 12, through its chamfered structure, transforms the radial stress concentrated near the chain mating mounting opening 13 into a uniform distribution in a ring-shaped area.
[0045] Specifically, traditional track links are mostly solid structures or simple slotted designs. Due to the lack of effective stress relief structures at the hinges, stress concentration easily occurs under high-frequency bending loads, leading to the initiation of fatigue cracks. This solution, through the combination of square groove 11 and circular through-hole 12, can reduce the maximum tensile stress at the edge of the pin hole by about 10% to 15%, delaying crack initiation time and improving the fatigue resistance of the track links.
[0046] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
Claims
1. A drive connection forging for a bulldozer track, characterized by, Includes chain link bodies (1) that are sequentially hinged along the length of the track; A square groove (11) extending longitudinally along the track is provided on the top of the non-ground contact side of the chain link body (1). The top of the link body (1) has a circular through-hole (12) located in the middle of the square groove (11). Both sides of the chain link body (1) are provided with chain docking installation ports (13). The chain docking installation ports (13) are round holes and are used for assembly and disassembly of multiple chain link bodies (1). The combination of square groove (11) and circular through-hole (12) forms a stress relief channel, which is used to disperse the alternating stress of the link body (1) under complex working conditions.
2. A drive connection forging for a bulldozer track as set forth in claim 1, characterized in that: The edges of the square groove (11) are all chamfered, and the inner diameter of the square groove (11) decreases from top to bottom.
3. A drive connection forging for a bulldozer track as set forth in claim 2, characterized in that: The chamfered edge structure of the square trough (11) and the circular through-hole (12) form a guide slope, which is used to form the main sludge discharge channel.
4. The drive connection forging for a bulldozer track as set forth in claim 1, wherein: The top of the chain link body (1) is provided with cuboid openings (14) on both sides of the square groove (11), and the cuboid openings (14) penetrate the chain link body (1), and the cuboid openings (14) can serve as secondary mud discharge channels.
5. A drive connection forging for a bulldozer track as defined in claim 4 wherein: The top of the link body (1) is provided with a second slot (15) located on both sides of the cuboid opening (14), and the shape of the second slot (15) is a cuboid structure, and the corners of the second slot (15) are right angle structures.
6. A drive connection forging for a bulldozer track as defined in claim 5 wherein: The edges of the cuboid opening (14) and the square groove (11) are both chamfered.
7. A drive connection forging for a bulldozer track as set forth in any one of claims 5-6, characterized in that: The cuboid opening (14), the square groove (11), and the circular through-hole (12) together form an airflow channel, which is used to improve the heat dissipation performance of the assembled link body (1).