Rubber seal seat of valve oil seal metal framework

Abstract

The utility model relates to valve oil seal technical field discloses a kind of rubber seal seat of valve oil seal metal framework, including rubber ring, T-shaped framework, dustproof lip and sealing lip, the inside of rubber ring is provided with the T-shaped framework that can prevent deformation, the bottom of T-shaped framework is towards the center of rubber ring, spring groove one of annular spiral spring one is established in the corner of rubber ring one side, spring groove two is established in the corner of rubber ring other side, the inside of spring groove two is placed with the annular spiral spring two that can extrude, dustproof lip is set in spring groove one inside near the inner wall side of spring groove one, sealing lip is set in rubber ring inside near the inner wall other side of spring groove two. In the utility model, T-shaped framework of low carbon steel material is embedded inside rubber ring, bottom T angle is towards the axial direction of sealing ring, effectively resist the radial force generated by oil pressure or air pressure, significantly improve the rigidity and anti-deformation ability of rubber ring whole, improve the reliability of long-term sealing.

Description

Technical Field

[0001] This utility model relates to the field of valve stem seal technology, and in particular to a rubber sealing seat for a valve stem seal metal skeleton. Background Technology

[0002] Valve stem seals are key sealing elements in the engine's valve train. Their core function is to prevent engine oil from entering the combustion chamber from the top of the valve guide, while also preventing the air-fuel mixture or exhaust gas in the combustion chamber from entering the crankcase. As the core component of valve stem seals, the sealing performance, durability, and reliability of the rubber seal seat (usually consisting of a metal skeleton and a rubber body) directly affect the engine's operating efficiency, oil consumption, and emission levels. Therefore, developing high-performance valve stem seal rubber seal seats is crucial for improving the overall performance of the engine.

[0003] In the existing technology, valve stem seal rubber sealing seats generally adopt a structure of metal skeleton and rubber vulcanization composite. The metal skeleton is usually designed as a cylindrical shape or a structure with simple flanges, which is embedded in the body of the rubber sealing seat. It mainly plays the role of supporting the rubber body, providing installation rigidity, and positioning with valve guides or cylinder heads. The rubber part mainly forms the sealing lip that contacts the valve stem, and dynamic sealing is achieved by relying on the elasticity and interference of the rubber itself.

[0004] However, a significant problem exists with the commonly used metal frame structure in existing technologies: its structural rigidity and resistance to radial deformation are relatively limited. Under actual engine operating conditions, the valve stem not only undergoes high-speed reciprocating motion but also often experiences radial runout or eccentric oscillation. At the same time, the oil pressure within the sealing cavity is not constant. When encountering high oil pressure fluctuations or significant radial eccentricity of the valve stem, the traditional frame structure struggles to provide sufficient support rigidity, easily leading to twisting, collapse, or even overall displacement of the rubber sealing seat body it encloses. This deformation disrupts the initially designed uniform contact pressure distribution and stable fit between the sealing lip and the valve stem, causing sealing interface failure and increasing the risk of abnormal oil consumption or premature seal damage, thus limiting the long-term sealing reliability and service life of the valve stem seal. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a rubber sealing seat for a valve oil seal metal skeleton, which aims to improve the problem of insufficient support stiffness of traditional skeleton structures.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rubber sealing seat for a valve stem seal metal skeleton, comprising:

[0008] The rubber ring has an internal T-shaped skeleton to prevent deformation.

[0009] The T-shaped frame has its bottom facing the center of the rubber ring.

[0010] A spring groove is provided at one corner of the rubber ring to support the annular helical spring.

[0011] A spring groove is provided at the corner of the other side of the rubber ring to support the annular helical spring.

[0012] Dustproof lip, the dustproof lip is set on the inner wall side near the spring groove;

[0013] The sealing lip is located on the other side of the inner wall of the rubber ring, near the spring groove.

[0014] Furthermore, the rubber ring is made of fluororubber and is responsible for controlling the flow of a small amount of engine oil to the valve stem and guide to provide continuous lubrication.

[0015] Furthermore, the T-shaped frame is made of low-carbon steel. The T-shaped frame resists the deformation force caused by oil pressure fluctuations or radial eccentricity of the valve stem, and prevents the rubber ring from twisting or shifting.

[0016] Furthermore, the dustproof lip has an outward tilt angle, which adaptively conforms to the valve stem surface under the action of the annular helical spring.

[0017] Furthermore, the annular helical spring provides a continuous clamping force to the dustproof lip.

[0018] Furthermore, the sealing lip has a thick blade-like structure.

[0019] Furthermore, the second annular helical spring provides dynamic clamping force to the sealing lip, reducing the attenuation of sealing pressure caused by rubber relaxation or valve stem eccentricity.

[0020] Furthermore, the outer edge of the rubber ring is provided with a front chamfer and a rear chamfer.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a T-shaped skeleton made of low-carbon steel is embedded inside the rubber ring. Its unique T-angle structure design ensures that the larger end face of the T-angle is stably facing the axis of the sealing ring. During assembly and use, this structure can effectively resist the radial force generated by oil pressure or air pressure, significantly improve the overall rigidity and deformation resistance of the rubber ring, and prevent the sealing seat from twisting, collapsing or shifting under high pressure or axial eccentricity, thereby ensuring the stable fit of the sealing interface and greatly improving the reliability of long-term sealing.

[0023] 2. In this utility model, a special spring groove is provided on the inner side of the dustproof lip on the inner wall of the rubber ring, and a ring-shaped helical spring is embedded therein. This spring continuously applies a uniform and appropriate radial clamping force to the dustproof lip. When the device is working and the shaft rotates, the spring force can drive the dustproof lip to closely follow the shaft surface, automatically compensating for gap changes caused by shaft runout, minor wear or manufacturing tolerances, effectively preventing external dust, impurities and moisture from entering the sealing area, providing a reliable protective barrier for the internal core sealing lip, and significantly extending the service life of the seal. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a rubber sealing seat for a valve stem seal metal skeleton proposed in this utility model.

[0025] Figure 2 This is a schematic diagram of the T-shaped skeleton structure of the rubber sealing seat of the valve oil seal metal skeleton proposed in this utility model.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a schematic diagram of the annular helical spring structure of the rubber sealing seat of the valve oil seal metal skeleton proposed in this utility model.

[0028] Legend:

[0029] 1. Rubber ring; 2. T-shaped skeleton; 3. Dustproof lip; 4. Spring groove one; 5. Annular helical spring one; 6. Sealing lip; 7. Spring groove two; 8. Annular helical spring two. Detailed Implementation

[0030] 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.

[0031] Reference Figures 1-4This utility model provides an embodiment of a rubber sealing seat for a valve stem metal skeleton, comprising a main structure serving as the sealing seat, whose elastic properties allow it to tightly fit with the valve stem to form a sealing surface, and a rubber ring 1 that supports internal components and cooperates with external parts. The rubber ring 1 has a T-shaped skeleton 2 inside to prevent deformation. The bottom of the T-shaped skeleton 2 faces the center of the rubber ring 1, which can more effectively resist radial force and prevent the rubber ring 1 from twisting due to uneven force. A spring groove 4 is provided at one corner of the rubber ring 1 to support a ring-shaped helical spring 5, and a spring groove 4 is provided at the other corner of the rubber ring 1 to support a ring-shaped helical spring 5. The spring groove 7 of the ring-shaped helical spring 8 applies a continuous clamping force to the sealing lip 6 through its own elastic deformation, ensuring a tight fit between the sealing lip 6 and the valve stem. The dustproof lip 3 prevents external impurities from entering the sealing area, protecting the sealing lip 6 and its internal structure. The dustproof lip 3 is located inside the spring groove 4 near the inner wall of the spring groove 4. The sealing lip 6 is in close contact with the valve stem, preventing oil leakage and combustion chamber gas from entering. The sealing lip 6 is located inside the rubber ring 1 near the inner wall of the spring groove 7 on the other side. The rubber ring 1 is made of fluororubber, which has excellent high-temperature resistance and oil corrosion resistance. The rubber ring 1 is responsible for controlling the upward flow of a small amount of oil to... Continuous lubrication is provided between the valve stem and the guide to reduce wear. The T-shaped frame 2 is made of low-carbon steel, which has good strength and toughness and can provide reliable support. The T-shaped frame 2 resists the deformation force caused by oil pressure fluctuations or radial eccentricity of the valve stem, preventing the rubber ring 1 from twisting or shifting. The dustproof lip 3 has an outward tilt angle. This tilt angle design allows the dustproof lip 3 to better adapt to the movement of the valve stem and enhance the fit with the valve stem surface. Under the action of the annular helical spring 5, it adaptively fits the valve stem surface, blocking external dust and carbon soot particles from entering the internal area. The annular helical spring 5 provides a continuous clamping force to the dustproof lip 3 to maintain dustproof protection. For stable performance, the thick blade-shaped sealing lip 6 increases the contact area with the valve stem, improving the sealing effect and enhancing its wear resistance. This prevents oil from seeping down the valve stem and entering the combustion chamber, avoiding oil waste and carbon buildup, and ensuring normal engine operation. The annular coil spring 8 provides dynamic clamping force to the sealing lip 6, reducing the attenuation of sealing pressure caused by rubber loosening or valve stem eccentricity, and maintaining stable sealing pressure. The outer edge of the rubber ring 1 has front and rear chamfers for easy positioning and installation. The chamfer design also serves as a guide during assembly, reducing installation difficulty and preventing damage to the rubber ring 1 during assembly.

[0032] Specifically, the rubber sealing seat of the valve stem seal metal skeleton achieves efficient sealing through the synergistic effect of multiple structures. The T-shaped skeleton 2, made of low-carbon steel and with a unique orientation, provides rigid support to resist radial forces and prevent deformation. The fluororubber ring 1 combines high temperature resistance and elasticity, and can also control the upward flow of a small amount of engine oil to lubricate the valve stem and guide, thus combining sealing and lubrication functions. The sealing lip 6 has a thick blade-like structure, which, together with the dynamic clamping force provided by the annular helical spring 8 in the spring groove 7, can effectively prevent engine oil from seeping down the valve stem into the combustion chamber and reduce the sealing pressure attenuation caused by rubber loosening or valve stem eccentricity. The dustproof lip 3, with its outward tilt angle, adaptively conforms to the valve stem surface under the continuous clamping force of the annular helical spring 5 in the spring groove 4, blocking the intrusion of external dust and carbon soot particles. The front and rear chamfers on the outer sides facilitate positioning and installation during assembly. The overall structure effectively improves the sealing reliability, dustproof effect and service life under complex engine operating conditions, and can stably prevent oil leakage and impurity intrusion, ensuring normal engine operation.

[0033] Working principle: When the rubber sealing seat of this valve stem seal metal skeleton is required, its rubber ring 1 is guided to the engine valve guide by the front and rear chamfers of the outer edge. After assembly, the T-shaped skeleton 2 made of low carbon steel provides rigid support with its T-angle end face facing the axis, resisting the deformation force caused by oil pressure fluctuation or radial eccentricity of the valve stem, preventing the rubber ring 1 from twisting or shifting. The sealing lip 6 on the inner wall of the rubber ring 1 is in interference contact with the valve stem, and the annular helical spring 8 embedded in the spring groove 7 applies a continuous radial clamping force, dynamically compensating for valve stem runout and wear, and ensuring oil sealing. At the same time, the dustproof lip 3 on the other side of the inner wall is tightly fitted by the annular helical spring 5 embedded in the spring groove 4, blocking the intrusion of external dust and impurities. The fluororubber rubber ring 1 is resistant to high temperature and oil corrosion. Combined with the reinforced support of the T-shaped skeleton 2 and the synergistic effect of the double springs, it ensures that the sealing lip 6 and the dustproof lip 3 always work stably during high-speed engine operation, significantly improving sealing reliability and service life.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rubber seal seat for a valve oil seal metal cage, characterized by: Include: Rubber ring (1), the inside of rubber ring (1) is provided with T-shaped skeleton (2) that can prevent deformation; T-shaped skeleton (2), the bottom of T-shaped skeleton (2) is towards the center of rubber ring (1); Spring slot one (4) that can bear annular spiral spring one (5) is set in the corner of rubber ring (1) one side; Spring slot two (7) that can bear annular spiral spring two (8) is set in the corner of rubber ring (1) other side; Dustproof lip (3) is set in the inner wall one side close to spring slot one (4); Sealing lip (6) is set in the inner wall other side close to spring slot two (7) in rubber ring (1).

2. A rubber seal seat for a valve oil seal metal cage according to claim 1, characterized in that: The rubber ring (1) is fluorine rubber material, and the rubber ring (1) is responsible for controlling trace engine oil to rise to the valve stem and guide pipe, and provides continuous lubrication.

3. A rubber seal seat for a valve oil seal metal cage according to claim 1, characterized in that: The T-shaped skeleton (2) is low carbon steel material, and the T-shaped skeleton (2) resists the deformation force caused by oil pressure fluctuation or valve stem radial eccentricity, prevents rubber ring (1) from twisting or displacement.

4. A rubber seal seat for a valve oil seal metal cage according to claim 1, characterized in that: The dustproof lip (3) has an angle towards the outside, and is self-adapted to the surface of valve stem under the action of annular spiral spring one (5).

5. A rubber seal seat for a valve oil seal metal cage as set forth in claim 1, characterized in that: The rubber ring (1) outside edge is provided with front chamfer and rear chamfer.

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