A large oil leakage valve stem oil seal structure

Abstract

The utility model discloses a big oil leakage valve stem oil seal structure, the inside of oil seal (5) is equipped with the asymmetric double angle lip mouth of angle inconsistency, through the change valve stem oil seal (5) lip mouth angle, including having asymmetric double angle lip mouth's valve stem oil seal (5) body, to control the oil leakage, through the oil leakage of valve stem oil seal (5) is increased appropriately, the lubrication of valve guide pipe is increased, and the thicker lubricating film is formed on the valve stem, reduces the abrasion, and the greater oil flow can also help to take away the partial heat of valve guide pipe and valve stem, reduces the working temperature, and the oil leakage of valve stem oil seal (5) is increased to the eccentric wear of valve guide pipe has the remarkable improvement, thereby optimizing the related parts of valve seat circle abrasion, the novel valve stem oil seal (5) not only has improved the problem of valve guide pipe and valve seat circle abrasion under the condition of extremely low cost, and for the subsequent further optimization, and the higher upper limit and possibility and continuous optimization improvement application of the arch.

Description

Technical Field

[0001] This utility model belongs to the field of oil seal technology. Specifically, this utility model relates to a valve stem oil seal structure with large oil discharge capacity. Background Technology

[0002] Wear of valve guides and valve seats is an unavoidable issue during engine operation, a common engine malfunction and an industry-wide problem. Domestic companies have been dedicated to improving the wear resistance of these components. However, research literature on the wear of engine valve guides and valve seats is scarce, both domestically and internationally. Current research focuses on reducing operating temperatures and finding more wear-resistant materials. However, breakthroughs in improving thermal efficiency and reducing combustion chamber temperature are very difficult across the industry, and the high cost of more wear-resistant materials makes them unsuitable for mass production.

[0003] A patent application (patent number 202420636192.4, published on December 10, 2024) discloses a single-lip oil seal, comprising an oil seal body and a rubber body. The oil seal body is annular in shape, with a central shaft hole. The rubber body protrudes from the shaft hole and has a through hole corresponding to the shaft hole. A first annular groove is formed between the oil seal body and the rubber body. A stepped sealing layer extends outward from the outer wall of the oil seal body. This invention improves the sealing effect of the oil seal by protruding the rubber body from the shaft hole of the oil seal body. This prevents loose contact between the oil seal and the shaft when the engine or various machines vibrate during operation, thus better avoiding poor sealing or oil leakage and reducing machine maintenance costs. Furthermore, the stepped sealing layer extending outward from the outer wall of the oil seal body improves the sealing performance of the single-lip oil seal when fitted onto bearing housings or other oil seal mounting components.

[0004] Currently available oil seals (such as single-lip oil seals) on the market often excessively restrict oil leakage to reduce oil consumption, resulting in insufficient lubrication between the valve stem and guide. Especially under high-temperature conditions, the friction at the oil film rupture boundary intensifies, accelerating the wear rate of the guide. Existing solutions that increase oil leakage have problems such as uncontrollable oil leakage and a surge in oil consumption, leading to more carbon deposits and further deterioration of wear. Utility Model Content

[0005] The present invention aims to provide a valve stem oil seal structure with large oil leakage capacity that reduces valve stem wear.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a valve stem oil seal structure with large oil discharge capacity, wherein the inner side of the oil seal is provided with an asymmetrical double-angle lip with inconsistent angles.

[0007] The lip is divided into a main sealing lip and a secondary lubricating lip, and the angle between the main sealing lip and the oil seal axis is greater than the angle between the secondary lubricating lip and the oil seal axis.

[0008] The oil seal surface located on the outer side of the lip is provided with a spring.

[0009] The oil seal has a skeleton inside.

[0010] The oil seal is fitted on the outside of the valve stem, and the frame is interference-fitted with the vehicle's exhaust valve guide.

[0011] The oil leakage rate of the oil seal is 3 mg / h to 10 mg / h.

[0012] The skeleton is in the shape of a corrugated tube.

[0013] The technical effects of this invention are as follows: by changing the angle of the valve stem oil seal lip, including the valve stem oil seal body with an asymmetrical double-angle lip, the oil leakage can be controlled. By appropriately increasing the oil leakage of the valve stem oil seal, the valve guide can be more lubricated, and a thicker lubricating film can be formed on the valve stem, reducing wear. In addition, the greater oil flow can also help to remove some of the heat from the valve guide and valve stem, reducing the operating temperature. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following:

[0015] Figure 1 This is a schematic diagram of the structure of a valve stem oil seal with large oil discharge capacity according to the present invention;

[0016] Figure 2 for Figure 1 Enlarged schematic diagram of point A in a valve stem oil seal structure with large oil leakage capacity;

[0017] Figure 3 for Figure 1 Comparison of leakage and wear data between batch production oil seals with a large leakage capacity valve stem oil seal structure and oil seals with an appropriately increased leakage capacity (batch production oil seals for cylinders 1, 3, and 5; oil seals with increased leakage capacity for cylinders 2, 4, and 6).

[0018] The markings in the diagram are: 1. Main sealing lip; 2. Secondary lubrication lip; 3. Spring; 4. Skeleton; 5. Oil seal. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0020] A valve stem oil seal structure with large oil leakage capacity is disclosed. The inner side of the oil seal 5 is provided with an asymmetrical double-angle lip with inconsistent angles. By changing the lip angle of the valve stem oil seal 5, including the valve stem oil seal 5 body with asymmetrical double-angle lips, the oil leakage capacity is controlled. By appropriately increasing the oil leakage capacity of the large valve stem oil seal 5, the lubrication of the valve guide is increased, and a thicker lubricating film is formed on the valve stem, reducing wear. In addition, the greater oil flow can also help to remove some of the heat from the valve guide and valve stem, reducing the operating temperature.

[0021] The valve stem is divided into a main sealing lip 1 and a secondary lubricating lip 2. The angle between the main sealing lip 1 and the axis of the oil seal 5 is greater than the angle between the secondary lubricating lip 2 and the axis of the oil seal 5. The angle of the main sealing lip 1 is α, and the angle of the secondary lubricating lip 2 is β, and α > β. The main sealing lip 1 plays a dynamic sealing role, while the secondary lubricating lip 2 is used to assist in oil scraping. By controlling the angles of the main sealing lip 1 and the secondary lubricating lip 2, the oil leakage can be controlled to ensure that the oil leakage is within a certain range. Appropriately increasing the oil leakage of the valve stem oil seal 5 can significantly improve the uneven wear of the valve guide, thereby optimizing the related parts of the valve seat wear.

[0022] A spring 3 is provided on the surface of the oil seal 5 located on the outer side of the lip; the spring 3 provides pressure compensation, so that the oil seal 5 fits tightly with the valve stem, reducing oil leakage.

[0023] The oil seal 5 has a skeleton 4 inside; the skeleton 4 cooperates with the exhaust valve duct of the car to prevent the oil seal 5 from shifting.

[0024] The oil seal 5 is mounted on the outside of the valve stem, and the frame 4 is interference-fitted with the exhaust valve guide of the car. The oil seal 5 is used to seal the oil, and the interference fit of the frame 4 can make the frame 4 and the guide more secure and more effectively prevent the oil seal 5 from shifting.

[0025] The oil leakage rate of oil seal 5 is 3mg / h to 10mg / h. The advantages and disadvantages of valve stem oil seal 5 with different oil leakage rates in different areas were compared through bench reliability tests. When the oil leakage rate is controlled within the range of 3mg / h to 10mg / h, oil seal 5 causes the least wear on the exhaust valve guide.

[0026] The skeleton 4 is corrugated; it can accommodate exhaust valve ducts of different sizes.

[0027] Working principle: The valve stem oil seal 5 lip angle is changed, including the valve stem oil seal 5 body with asymmetrical double-angle lips, where the angle of the main sealing lip 1 is α and the angle of the secondary lubrication lip 2 is β, and α > β, thereby increasing the oil leakage. At the same time, during the development process, various valve stem oil seals 5 with different oil leakage areas are manufactured. The advantages and disadvantages of valve stem oil seals 5 with different oil leakage areas are compared through bench reliability tests to verify the optimal range of oil leakage. This optimal range controls the oil leakage within the range of 3mg / h to 10mg / h, which can ensure that the increase in oil consumption is less than 10% while reducing wear by more than 50%.

[0028] By appropriately increasing the oil leakage of the large valve stem oil seal 5, lubrication of the valve guide is enhanced, and a thicker lubricating film is formed on the valve stem, reducing wear. Furthermore, the increased oil flow helps dissipate some heat from the valve guide and valve stem, lowering the operating temperature. Appropriately increasing the oil leakage of the large valve stem oil seal 5 significantly improves uneven wear of the valve guide, thereby optimizing the related components of valve seat wear. This new type of valve stem oil seal 5, at extremely low cost, not only significantly improves the wear problem of the valve guide and valve seat, but also provides a higher upper limit and possibility for further optimization and continuous improvement applications.

[0029] The technical effects of this utility model are as follows: by changing the lip angle of the valve stem oil seal 5, including the valve stem oil seal 5 body with an asymmetrical double-angle lip, the oil leakage can be controlled. By appropriately increasing the oil leakage of the valve stem oil seal 5, the valve guide can be lubricated more, and a thicker lubricating film can be formed on the valve stem, reducing wear. In addition, the greater oil flow can also help to remove some of the heat from the valve guide and valve stem, reducing the operating temperature.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A valve stem oil seal structure with large oil leakage capacity, characterized in that: The inner side of the oil seal (5) is provided with an asymmetrical double-angle lip with inconsistent angles. The lip is divided into a main sealing lip (1) and a secondary lubrication lip (2). The angle between the main sealing lip (1) and the axis of the oil seal (5) is greater than the angle between the secondary lubrication lip (2) and the axis of the oil seal (5).

2. The valve stem oil seal structure with large oil discharge capacity according to claim 1, characterized in that: The surface of the oil seal (5) located on the outer side of the lip is provided with a spring (3).

3. The valve stem oil seal structure with large oil discharge capacity according to claim 1, characterized in that: The oil seal (5) has a skeleton (4) inside.

4. The valve stem oil seal structure with large oil discharge capacity according to claim 3, characterized in that: The oil seal (5) is fitted on the outside of the valve stem, and the frame (4) is interference-fitted with the exhaust valve guide of the vehicle.

5. The valve stem oil seal structure with large oil discharge capacity according to claim 1, characterized in that: The oil leakage rate of the oil seal (5) is 3 mg / h to 10 mg / h.

6. The valve stem oil seal structure with large oil discharge capacity according to claim 3, characterized in that: The skeleton (4) is in the shape of a corrugated tube.

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