Anti-side-rolling torsion bar joint sealing structure

Abstract

The utility model discloses an anti-side-rolling torsion bar joint sealing structure, and belongs to the technical field of anti-side-rolling torsion bars. Comprising a ball pin, a torsion bar body, an end cover and a dust cover, the ball pin is assembled in a stepped hole of the torsion bar body through an outer ring, the end cover tightly presses a steel check ring to be assembled in the stepped hole of the torsion bar body, a lower lip of the dust cover is installed on a pin rod of the ball pin, and an upper lip of the dust cover is assembled on a stepped surface of the torsion bar body through a steel framework; the torsion bar is characterized in that a first sealing structure is arranged among the end cover, the steel check ring and the inner wall of the stepped hole of the torsion bar body to prevent a lubricant from leaking from the end cover; and a second sealing structure and a third sealing structure are arranged between the step surface of the torsion bar body and the steel framework, so that the lubricant is prevented from leaking from the steel framework. According to the torsion bar, the sealing performance can be greatly improved, the problems of grease leakage and oil leakage in the using process are solved, and the service life of the torsion bar is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to a sealing structure for an anti-roll torsion bar joint, belonging to the field of anti-roll torsion bar technology. Background Technology

[0002] Roll torsion bars are critical components installed on bogies in rail transit vehicles. Through the torsion and deflection of the torsion bar joint, they adapt to the floating, rolling, and turning movements of the car body and bogie, suppressing car body roll during cornering and crosswinds. Failure of the roll torsion bar joint will affect the ride comfort of the vehicle, and in severe cases, may even threaten passenger safety.

[0003] Existing anti-roll torsion bar joints have poor sealing and dustproof structures. After a period of running-in, grease inside the joint will leak or seep from the end cap or dust cover frame. For example... Figure 1 As shown, when the ball pin of the joint is in the left or right limit state, one side of the neck of the ball pin is compressed and the internal pressure increases, while the other side is stretched and the internal pressure decreases. The sealing structure at the steel frame of the dust cover is prone to leakage, and the grease inside the joint is very easy to leak through the dust cover frame.

[0004] Therefore, existing anti-roll torsion bar joints are prone to grease loss after prolonged use, resulting in severe abnormal noise and a short service life. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing an anti-roll torsion bar joint sealing structure that significantly improves its sealing performance, solves the problems of grease leakage and oil seepage during use, and greatly extends the service life of the torsion bar.

[0006] The technical solution of this utility model is as follows:

[0007] A sealing structure for an anti-roll torsion bar joint includes: a ball pin, a torsion bar body, an end cap, and a dust cover. The ball pin is fitted into a stepped hole in the torsion bar body via an outer ring. The end cap is fitted into the stepped hole in the torsion bar body by pressing against a steel retaining ring. The lower lip of the dust cover is mounted on the ball pin, and the upper lip is fitted into the stepped surface of the torsion bar body via a steel frame. The dust cover is characterized by having a first sealing structure between the end cap, the steel retaining ring, and the inner wall of the stepped hole in the torsion bar body to prevent lubricant leakage from the end cap; and a second and a third sealing structure between the stepped surface of the torsion bar body and the steel frame to prevent lubricant leakage from the steel frame.

[0008] In the above solution, the torsion bar body serves as a support, the ball pin is installed into the outer ring, and the outer ring is interference-fitted into the stepped hole of the torsion bar body. Then, the steel retaining ring, the first sealing structure, and the end cap are installed and riveted together using a riveting machine, effectively preventing the lubricant required for the ball pin's operation from leaking out of the end cap. The upper lip of the dust cover uses an external steel frame structure interference-fitted onto the stepped surface of the torsion bar body, and the lower lip is secured by a spring lock ring. Furthermore, a second and third sealing structure are installed at the upper lip, significantly improving the internal sealing of the joint, completely solving the problems of grease leakage and oil seepage during use, eliminating abnormal noise during operation, ensuring stable torque, low friction coefficient, and no noise, and greatly extending service life.

[0009] Furthermore, the first sealing structure includes a first O-ring and a first sealing groove; the stepped hole diameter of the torsion bar body gradually decreases from top to bottom, including a first hole, a second hole, and a third hole in sequence; the outer ring is assembled in the third hole; the steel retaining ring is assembled in the second hole; and the side of the end cap is assembled in the first hole; the height of the first hole is greater than the thickness of the side of the end cap; the height of the steel retaining ring is greater than the height of the second hole; the top of the steel retaining ring is topped with the end cap, so that the upper edge of the side of the end cap is in close contact with the top of the first hole; the lower edge of the side of the end cap, the steel retaining ring, and the first hole form a first sealing groove; and the first O-ring is compressed and assembled in the first sealing groove.

[0010] In the above solution, by adjusting the size of the steel retaining ring and the first hole, a rectangular cross-sectional space (i.e., the first sealing groove) is naturally formed after assembly, ensuring the volume compression interference of the first O-ring after compression. This avoids machining the positioning groove of the O-ring on the torsion bar body or auxiliary retaining ring, reducing machining costs and improving the load-bearing capacity of the joint.

[0011] A first O-ring is added at the gap between the torsion bar body (first hole) and the steel retaining ring to enhance the sealing performance. After riveting, the first O-ring is deformed and fits tightly with the end cap and the first hole to ensure sealing, prevent external dust and sewage from entering the joint, and prevent internal grease leakage or seepage. This can completely solve the problem of grease leakage or seepage during operation, thereby ensuring good lubrication throughout its service life, avoiding noise caused by poor lubrication, and extending service life.

[0012] Furthermore, the second sealing structure includes a second O-ring and a second sealing groove; the steel frame is annular with an inverted U-shaped cross-section; the second sealing groove is formed between the intersection of the outer circular surface and the end face of the stepped surface of the torsion bar body and the inner corner of the outer surface of the steel frame, and the second O-ring is compressed and assembled in the second sealing groove.

[0013] In the above solution, a second O-ring is added at the root of the step (the intersection of the outer circular surface and the end face of the step) of the torsion bar body and the rounded corner gap between the dust cover steel frame and the step. This enhances the sealing performance. After press fitting, the O-ring is deformed and fits tightly with the steel frame and the torsion bar body to ensure a tight seal, preventing external dust and sewage from entering the interior and preventing internal grease leakage or seepage. This completely solves the problem of grease leakage or seepage during operation, thereby ensuring good lubrication throughout its service life, avoiding noise caused by poor lubrication, and extending service life.

[0014] Furthermore, the outer surface of the steel frame has a rounded corner on its inner side. By setting the rounded corner of the steel frame, a certain gap will exist between the steel frame and the root of the step after assembly. This space is just enough to allow for an interference fit with the second O-ring, eliminating the need to process grooves to match the second O-ring. This ensures the interference fit of the compressed volume of the second O-ring, reduces processing costs, and improves the load-bearing capacity of the joint.

[0015] Furthermore, the third sealing structure is an adhesive layer, which is disposed between the outer circular surface of the stepped surface of the torsion bar body and the inner surface of the outer surface of the steel frame. Applying adhesive to the outer circular surface of the stepped surface to form an adhesive layer can increase the fit strength between the steel frame and the torsion bar body, reduce the risk of the dust cover falling off when deflection or torsion occurs during operation, and play a secondary sealing role.

[0016] Furthermore, the outer surface of the steel frame of the dust cover also features a rounded corner at the bottom edge of its inner side. This rounded corner groove can fix any excess adhesive after pressing, allowing for secondary sealing even if the second O-ring fails, and increasing the bonding force between the dust cover and the torsion bar body.

[0017] Furthermore, the inner diameter of the first O-ring is larger than that of the second O-ring, and the cross-sectional area of ​​the first O-ring is larger than that of the second O-ring. By adjusting the inner diameter and cross-sectional area of ​​the two O-rings, the second O-ring is interference-fitted onto the stepped area, which avoids the need to add a positioning groove to the second O-ring, reducing processing costs and improving the load-bearing capacity of the joint.

[0018] Furthermore, the upper spherical surface of the ball pin is provided with a ball cup, and a conical spring is provided between the ball cup and the end cap, so that the end cap is pressed tightly against the stepped end face of the stepped hole. The conical spring has sufficient preload, which improves the overall sealing performance and ensures the stability of the torsion bar. Attached Figure Description

[0019] Figure 1 The diagram shows the anti-roll torsion bar joint of this utility model at its left and right limits.

[0020] Figure 2 This is a schematic diagram of the anti-roll torsion bar joint sealing structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the first O-ring or the second O-ring in this utility model;

[0022] Figure 4 This is the free-state installation state of the first O-ring in this utility model;

[0023] Figure 5 This is the free-state installation state of the second O-ring in this utility model;

[0024] Figure 6 This is a schematic diagram of the stepped hole structure of the torsion bar body in this utility model;

[0025] In the diagram: 1. Ball pin; 2. Outer ring; 3. Torsion bar body; 4. Steel retaining ring; 5. Ball cup; 6. Conical spring; 7. Support sleeve; 8. Dust cover; 9. Steel frame; 10. Lubricant; 11. First O-ring; 12. First hole; 13. Second hole; 14. Third hole; 15. Second O-ring; 16. Transition fillet; 17. Adhesive layer; 18. Transition fillet; 19. End cap; 20. Stepped surface of torsion bar body. Detailed Implementation

[0026] An anti-roll torsion bar joint, such as Figure 2 As shown, ball pin 1 is installed into outer ring 2, and outer ring is interference-fitted into stepped hole of torsion bar body 3. Steel retainer ring 4 is installed into stepped hole of torsion bar body, and the end face of outer ring is pressed by the end face of steel retainer ring. Ball cup 5 is spherically fitted with ball pin. Conical spring 6 is installed into stepped surface of ball cup. Finally, end cap 19 is installed and riveted. Conical spring is located between ball cup and end cap. Support sleeve 7 is threaded into ball pin neck. The lower lip of dust cover 8 is installed on ball pin rod, and the upper lip is assembled to stepped surface of torsion bar body through steel frame 9. Lubricant 10 is sprayed into the gaps between ball cup, steel retainer ring, ball pin, and outer ring. Lubricant 10 is placed between outer ring and ball pin. Lubricant 10 is filled in the gap between stepped hole of torsion bar body and support sleeve.

[0027] A sealing structure for an anti-roll torsion bar joint includes a first sealing structure (such as...) between the end cap, the steel retaining ring, and the inner wall of the stepped hole in the torsion bar body. Figure 2 (As shown in section B), to prevent lubricant leakage from the end cap; a second sealing structure and a third sealing structure (as shown in section B) are provided between the stepped surface of the torsion bar body and the steel frame. Figure 2 (As shown in section A), to prevent lubricant from leaking from the steel frame.

[0028] In one embodiment of this utility model, the first sealing structure includes a first O-ring 11 and a first sealing groove; the stepped hole diameter of the torsion bar body is, for example... Figure 6As shown, the dimensions gradually decrease from top to bottom, including a first hole 12, a second hole 13, and a third hole 14. The outer ring is fitted into the third hole, the steel retaining ring is fitted into the second hole, and the side of the end cap is fitted into the first hole. The height of the first hole is greater than the thickness of the side of the end cap, and the height of the steel retaining ring is greater than the height of the second hole. The top of the steel retaining ring is placed on top of the end cap, so that the upper edge of the side of the end cap is tightly attached to the top of the first hole. The lower edge of the side of the end cap, the steel retaining ring, and the first hole naturally form a rectangular cross-sectional space, namely the first sealing groove. No additional positioning groove is required. The first O-ring is compressed and fitted into the first sealing groove. Riveting is performed using a riveting machine to ensure that the first O-ring is completely interference-filled in the first sealing groove, increasing the sealing performance. By adjusting the depth L and width B of the steel retaining ring after fitting with the first hole, a rectangular cross-sectional space is naturally formed after assembly, ensuring that the O-ring is compressed as... Figure 2 The morphology shown indicates that the volumetric compression interference is controlled at 0.7 times the cross-section of the O-ring.

[0029] In one embodiment of the present invention, the second sealing structure includes a second O-ring 15 and a second sealing groove; the steel frame is annular with an inverted U-shaped cross-section; the second sealing groove is formed between the intersection of the outer circular surface and the end face of the torsion bar body and the inner corner of the outer surface of the steel frame, and the second O-ring is compressed and assembled in the second sealing groove.

[0030] In one embodiment of this utility model, a transition fillet 16 is provided at the inner corner of the outer surface of the steel frame, creating a certain gap between the steel frame and the root of the step. This space is just enough to allow for an interference fit of the second O-ring, eliminating the need for machining a groove to fit the second O-ring. In another embodiment of this utility model, the radius R of the transition fillet 16 of the dust cover steel frame can be set to 2mm. After assembly, a certain gap exists between the dust cover steel frame and the root of the step, ensuring that the O-ring compresses as expected. Figure 2 The morphology shown indicates that the volumetric compression interference is controlled at 0.7 times the cross-section of the O-ring.

[0031] In one embodiment of this utility model, the third sealing structure is an adhesive layer 17, which is disposed between the outer circular surface of the stepped surface of the torsion bar body and the inner side surface of the outer surface of the steel frame. The bottom edge of the inner side surface of the outer surface of the dust cover steel frame is also designed with a transition rounded corner 18, which is a rounded corner groove to fix the excess adhesive after pressing.

[0032] In one embodiment of this invention, the inner diameter of the first O-ring is larger than the inner diameter of the second O-ring, and the cross-sectional area of ​​the first O-ring is larger than the cross-sectional area of ​​the second O-ring. This allows the second O-ring to be interference-fitted onto the stepped portion, avoiding the need for an additional positioning groove in the second O-ring. In another embodiment of this invention, the inner diameter of the first O-ring is 58.3 mm, and its cross-sectional diameter is 1.85 mm. The inner diameter of the second O-ring is 44.5 mm, and its cross-sectional diameter is 1.5 mm.

[0033] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A sealing structure for an anti-roll torsion bar joint, comprising: Ball pin, torsion bar body, end cap, dust cover. The ball pin is fitted into the stepped hole of the torsion bar body through the outer ring. The end cap is fitted into the stepped hole of the torsion bar body by pressing the steel retaining ring. The lower lip of the dust cover is installed on the ball pin, and the upper lip is fitted into the stepped surface of the torsion bar body through a steel frame. Its characteristic is that a first sealing structure is provided between the end cap, the steel retaining ring, and the inner wall of the stepped hole of the torsion bar body to prevent lubricant from leaking from the end cap; a second sealing structure and a third sealing structure are provided between the stepped surface of the torsion bar body and the steel frame to prevent lubricant from leaking from the steel frame.

2. The anti-roll torsion bar joint sealing structure according to claim 1, characterized in that, The first sealing structure includes a first O-ring and a first sealing groove; The stepped hole diameter of the torsion bar body gradually decreases from top to bottom, including a first hole, a second hole, and a third hole in sequence. The outer ring is assembled in the third hole, the steel retaining ring is assembled in the second hole, and the side of the end cap is assembled in the first hole. The height of the first hole is greater than the thickness of the side of the end cap, the height of the steel retaining ring is greater than the height of the second hole, and the top of the steel retaining ring is topped with the top cap, so that the lower edge of the side of the end cap, the steel retaining ring, and the first hole form a first sealing groove, and the first O-ring is compressed and assembled in the first sealing groove.

3. The anti-roll torsion bar joint sealing structure according to claim 2, characterized in that, The second sealing structure includes a second O-ring and a second sealing groove; The steel frame is ring-shaped with an inverted U-shaped cross-section; a second sealing groove is formed between the intersection of the outer circular surface and the end face of the stepped surface of the torsion bar body and the inner corner of the outer surface of the steel frame, and the second O-ring is compressed and assembled in the second sealing groove.

4. The anti-roll torsion bar joint sealing structure according to claim 3, characterized in that, The outer surface of the steel frame has a rounded corner at its inner corner.

5. The anti-roll torsion bar joint sealing structure according to claim 4, characterized in that, The outer surface of the steel frame has a rounded corner at the bottom edge of its inner side.

6. The anti-roll torsion bar joint sealing structure according to claim 3, characterized in that, The third sealing structure is an adhesive layer, which is disposed between the outer circular surface of the step surface of the torsion bar body and the inner side of the outer surface of the steel frame.

Images