Wear-resistant coupler yoke

Abstract

The utility model discloses an anti-abrasion coupler yoke which comprises a coupler yoke body, the coupler yoke body is provided with a sliding groove bottom face, a step-shaped groove is formed in the center of the sliding groove bottom face, a lining plate is embedded in the step-shaped groove, and the shape of the lining plate is matched with that of the step-shaped groove. The coupler yoke body is provided with a pin hole, the pin hole is of an hourglass structure with the aperture of the two ends larger than the aperture of the middle, two bushings are symmetrically installed in the pin hole, the outer surfaces of the bushings are conical and matched with the inner wall of the pin hole, the inner surfaces of the bushings are cylindrical surfaces, oil injection through holes are longitudinally formed in the side walls of the bushings, and oil guide ring grooves are symmetrically formed in the inner sides of the contact faces of the two bushings. The two oil guide ring grooves are combined into a complete oil guide ring, and the oil injection through holes are communicated with the oil guide ring grooves. Only the lining plate needs to be replaced after the lining plate is abraded, overall replacement of the coupler yoke is avoided, loads are evenly distributed along the whole length of a pin hole through the conical lining, and the lining bears friction and fretting loss of the coupler yoke pin and can be independently replaced after being abraded.

Description

Technical Field

[0001] This utility model relates to the technical field of railway vehicle coupler systems, specifically to a wear-resistant coupler tail frame. Background Technology

[0002] In railway vehicle coupler systems, the coupler tail frame is a key load-bearing component that transmits traction and impact forces. Current technologies primarily improve the strength of the coupler tail frame through optimized structural design; however, wear issues persist. The tail of the coupler slides on the bottom of the chute and bears impact forces for extended periods, leading to direct metal wear in this area. Once wear exceeds the limit, the entire coupler tail frame must be replaced, resulting in high maintenance costs. Furthermore, traditional cylindrical pin holes are prone to stress concentration at both ends, causing fretting wear on the contact surface between the coupler tail pin and the pin hole. Prolonged use can lead to fatigue cracks, threatening operational safety. Utility Model Content

[0003] The purpose of this utility model is to provide a wear-resistant hook tail frame, which has the advantage of specifically solving the wear of the bottom surface of the slide groove and the pin hole, thus solving the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A wear-resistant hook tail frame includes a hook tail frame body. The hook tail frame body has a grooved bottom surface with a stepped groove at the center of the grooved bottom surface. A liner is embedded in the stepped groove, and the shape of the liner is adapted to the stepped groove. The hook tail frame body has a pin hole with an hourglass structure where the diameters at both ends are larger than the diameter in the middle. Two bushings are symmetrically installed in the pin hole. The outer surface of the bushing is conical and matches the inner wall of the pin hole, while the inner surface is cylindrical. An oil injection through hole is longitudinally opened on the side wall of the bushing. Oil guide ring grooves are symmetrically opened on the inner side of the contact surface of the two bushings. The two oil guide ring grooves form a complete oil guide ring, and the oil injection through hole communicates with the oil guide ring groove.

[0006] Preferably, the sidewall of the bushing is vertically provided with a second threaded groove, and each bushing has no less than three second threaded grooves distributed around it.

[0007] Preferably, the second threaded grooves between the two bushings correspond to each other, and the long countersunk bolts pass through the second threaded grooves and are fixed by nuts.

[0008] Preferably, the liner is made of high-toughness wear-resistant alloy steel.

[0009] Preferably, the liner has first threaded grooves at its four corners, and the stepped groove also has first threaded grooves at corresponding positions. High-strength countersunk bolts pass through the first threaded grooves to fix the liner in the stepped groove.

[0010] Preferably, the head of the high-strength countersunk bolt is recessed below the plane of the liner plate.

[0011] Preferably, the outer surface of the liner is 0.5-1mm higher than the bottom surface of the chute.

[0012] Preferably, the inner surface of the bushing is a precision cylindrical surface, and the precision cylindrical surface is clearance-fitted with the hook pin.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention features a stepped groove at the center of the bottom surface of the chute, into which a high-toughness, wear-resistant alloy steel liner slightly higher than the bottom surface is installed and fixed with countersunk bolts. This concentrates sliding friction and impact loss on the replaceable liner, requiring only the liner to be replaced when worn, avoiding the need to replace the entire hook tail frame. The pin hole is designed as an hourglass structure, wide at both ends and narrow in the middle, with a high-hardness alloy steel bushing with a conical outer surface embedded inside. It is fixed by a long countersunk bolt, and the conical bushing ensures that the load is evenly distributed along the entire length of the pin hole. The bushing bears the friction and fretting loss of the hook tail pin and can be replaced independently after wear. The bushing sidewall has an oil injection through hole that connects to the oil guide ring groove. When the two bushings are joined, the oil guide ring groove forms a closed-loop oil channel. The oil fills the oil guide ring groove through capillary action, directly lubricating the contact surface of the hook tail pin and continuously lubricating to reduce the mechanical wear rate between the inner wall of the bushing and the hook tail pin. Attached Figure Description

[0015] Figure 1 This is an isometric drawing of the hook tail frame of this utility model;

[0016] Figure 2 This is an isometric view of the stepped groove of this utility model;

[0017] Figure 3 This is an isometric drawing of the liner of this utility model;

[0018] Figure 4 This is a sectional view of the hook tail frame body of this utility model;

[0019] Figure 5 This is an isometric drawing of the bushing of this utility model;

[0020] Figure 6 This is a cross-sectional view of the bushing of this utility model.

[0021] In the figure: 1. Hook tail frame body; 2. Stepped groove; 3. Liner plate; 4. Slide bottom surface; 5. High-strength countersunk bolt; 6. First threaded groove; 7. Pin hole; 8. Bushing; 9. Second threaded groove; 10. Long countersunk bolt; 11. Oil injection through hole; 12. Oil guide ring groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] To address the issue of easy wear and tear on the hook-tail frame in existing technologies, leading to high replacement costs, the following technical solution is proposed. Please refer to [link / reference]. Figure 1-6 ;

[0024] A wear-resistant hook tail frame includes a hook tail frame body 1. A stepped groove 2 is formed at the center of the bottom surface 4 of the groove of the hook tail frame body 1. A liner 3 is embedded in the stepped groove 2. The liner 3 is made of high toughness wear-resistant alloy steel. The shape of the liner 3 is adapted to the stepped groove 2. The thickness of the liner 3 is greater than the depth of the stepped groove 2. The outer surface of the liner 3 is slightly higher than the bottom surface 4 of the groove. After installation, the top surface of the liner 3 is slightly higher than the bottom surface 4 of the groove by 40.5-1mm, forming a raised load-bearing surface. The tail of the car coupler first contacts the liner 3. The impact force is buffered by the elastic deformation of the liner 3. The stepped groove 2 provides lateral support to prevent the liner 3 from breaking.

[0025] The four corners of the liner plate 3 are provided with first threaded grooves 6 for high-strength countersunk bolts 5 to pass through. The corresponding positions of the stepped groove 2 are also provided with first threaded grooves 6. The liner plate 3 is fixed in the stepped groove 2 by high-strength countersunk bolts 5. The high-strength countersunk bolts 5 pass through the first threaded grooves 6 and the head of the high-strength countersunk bolts 5 is sunk below the plane of the liner plate 3 to avoid interfering with the movement of the coupler.

[0026] Specifically, the bottom surface 4 of the chute bears the huge impact force and sliding friction of the coupler tail, and is one of the areas with the most severe wear. The coupler tail first contacts the raised liner 3. The liner 3 absorbs some of the impact energy through plastic deformation, reducing the direct impact on the coupler tail frame body 1. Most of the sliding friction also occurs on the liner 3. The liner 3 can be replaced after wear. The liner 3 protects the coupler tail frame body 1. The stepped groove 2's step-by-step embedding design makes the liner 3 tightly wrapped and supported by the coupler tail frame body 1, and disperses the stress, making the force more even and the liner 3 less prone to breakage.

[0027] The pin hole 7 on the hook tail frame body 1 has a symmetrical hourglass structure. The diameters at both ends of the pin hole 7 are larger than the diameter in the middle. Two bushings 8 are symmetrically installed inside the pin hole 7. The bushings 8 are made of high-hardness alloy steel. The outer surface of the bushing 8 is set as a cone that matches the inner wall of the pin hole 7. The inner surface of the bushing 8 is a precision cylindrical surface. The precision cylindrical surface is clearance-fitted with the hook tail pin.

[0028] The bushing 8 has a second threaded groove 9 vertically opened inside its side wall. Each bushing 8 has no less than three second threaded grooves 9 distributed around it. The second threaded grooves 9 penetrate the bushing 8. The second threaded grooves 9 between two bushings 8 correspond to each other and are passed through by a long countersunk bolt 10 and fixed by a nut. The bushing 8 also has an oil injection through hole 11 longitudinally opened on its side wall. The inner side of the contact surface of the two bushings 8 is symmetrically provided with oil guide ring grooves 12. The two oil guide ring grooves 12 are combined into a complete oil guide ring after the bushings 8 are installed. The oil injection through hole 11 is connected to the oil guide ring groove 12.

[0029] Specifically, two bushings 8 are symmetrically inserted into the pin holes 7 from both ends, and the long countersunk bolts 10 are sequentially inserted into the corresponding second threaded grooves 9 and installed. At this time, the two bushings 8 are tightly fitted with the pin holes 7 and clamp the pin holes 7. The tapered design makes the contact between the pin holes 7 and the bushings 8 more uniform, avoids stress concentration at both ends, and facilitates the initial alignment of the bushings 8. The bushings 8 reduce the fretting wear and fatigue cracks of the pin holes 7. The bushings 8 can be replaced when they are severely worn. If it is necessary to keep the contact surface between the bushings 8 and the hook pin lubricated, oil can be injected into the oil injection hole 11. The oil flows to both sides of the oil guide ring groove 12 under capillary action, and finally gradually fills the oil guide ring groove 12 under capillary action, thereby achieving lubrication of the contact surface between the bushings 8 and the hook pin and reducing mechanical friction.

[0030] Working principle: Under traction or impact conditions, the tail of the coupler preferentially contacts the 0.5-1mm raised wear-resistant liner 3, concentrating the impact force on the liner rather than the chute body 4. The liner 3 buffers the instantaneous impact through elastic deformation; the sidewall support of the stepped groove 2 diffuses stress in all directions, preventing the liner 3 from breaking due to localized stress concentration. The load of the coupler tail pin is transferred to the tapered bushing 8, and the tapered surface fit ensures that the pressure is evenly distributed along the entire length of the pin hole 7, eliminating the stress peaks at both ends of the traditional cylindrical hole. Grease is injected into the guide oil ring groove 12 through the oil injection through hole 11 to reduce coupler tail pin friction. By transferring wear to replaceable wear-resistant parts and optimizing the stress distribution of key contact surfaces, the lifespan of the coupler tail frame body is extended.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A wear-resistant hook tail frame, comprising a hook tail frame body (1), characterized in that, The hook tail frame body (1) is provided with a sliding groove bottom surface (4), and a stepped groove (2) is opened in the center of the sliding groove bottom surface (4). A liner (3) is embedded in the stepped groove (2), and the shape of the liner (3) is adapted to the stepped groove (2). The hook tail frame body (1) is provided with a pin hole (7), and the pin hole (7) is an hourglass structure with the diameter of the two ends larger than the diameter of the middle hole. Two bushings (8) are symmetrically installed in the pin hole (7). The outer surface of the bushing (8) is a cone that matches the inner wall of the pin hole (7), and the inner surface is a cylindrical surface. An oil injection through hole (11) is opened longitudinally on the side wall of the bushing (8). An oil guide ring groove (12) is symmetrically opened on the inner side of the contact surface of the two bushings (8). The two oil guide ring grooves (12) form a complete oil guide ring. The oil injection through hole (11) is connected to the oil guide ring groove (12).

2. The wear-resistant hook tail frame according to claim 1, characterized in that, The sidewall of the bushing (8) is vertically provided with a second threaded groove (9), and each bushing (8) is provided with no less than three second threaded grooves (9) distributed around it.

3. The wear-resistant hook tail frame according to claim 2, characterized in that, The second threaded groove (9) between the two bushings (8) corresponds to the long countersunk bolt (10) passing through the second threaded groove (9) and being fixed by a nut.

4. The wear-resistant hook tail frame according to claim 3, characterized in that, The liner (3) is made of high-toughness wear-resistant alloy steel.

5. The wear-resistant hook tail frame according to claim 4, characterized in that, The liner (3) has first threaded grooves (6) at its four corners, and the stepped groove (2) also has first threaded grooves (6) at the corresponding positions. The high-strength countersunk bolts (5) pass through the first threaded grooves (6) to fix the liner (3) in the stepped groove (2).

6. The wear-resistant hook tail frame according to claim 5, characterized in that, The head of the high-strength countersunk bolt (5) is recessed below the plane of the liner plate (3).

7. The wear-resistant hook tail frame according to claim 6, characterized in that, The outer surface of the liner (3) is 0.5-1mm higher than the bottom surface (4) of the chute.

8. The wear-resistant hook tail frame according to claim 7, characterized in that, The inner surface of the bushing (8) is a precision cylindrical surface, which is in clearance fit with the hook pin.

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