A valve oil seal with adjustable leakage

Abstract

The present invention discloses a valve oil seal with adjustable leakage, comprising a reinforcement skeleton, a rubber body fixedly connected to the inner wall of the reinforcement skeleton, a first spring groove opened near the top of the reinforcement skeleton on the outer wall of the rubber body, a self-locking spring structure provided on the inner wall of the first spring groove, the outer wall of the self-locking spring structure is sleeved and tightly matched with the inner wall of the first spring groove, a main sealing lip is provided on the inner wall of the rubber body near the self-locking spring structure, a protective structure is provided on the inner wall of the rubber body near the bottom of the main sealing lip, an adjustment ring is fixedly connected to the bottom of the reinforcement skeleton, a fixing ring is fixedly connected to the bottom of the adjustment ring, and a second spring groove is opened near the top of the adjustment ring on the outer wall of the reinforcement skeleton. By replacing the adjustment spring to adjust the force of the reinforcement skeleton, the adjustment ring is slightly deformed, the matching clearance at the main sealing lip can be changed, and an interference fit is generated at the main sealing lip, so as to achieve the effect of adjustable leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile accessories, and in particular relates to a valve oil seal with adjustable leakage. Background Art

[0002] The valve oil seal is connected to the valve guide and installed on the cover of the car engine. Its function is to prevent the oil from flowing into the internal combustion tank of the engine, causing oil loss due to leakage and penetration. As one of the common seals in the engine, the valve oil seal is generally composed of an exoskeleton and fluororubber vulcanized together. A self-tightening spring or steel wire will be installed at the diameter to achieve the sealing of the valve guide on the engine.

[0003] The leakage of traditional valve oil seals is controlled by self-tightening springs and cannot be adjusted. When the valve oil seal is in use, the radial force decreases due to the increase in operating temperature, causing the sealing lip to fail. In order to compensate for the reduction in radial force caused by temperature rise, general valve oil seals increase the radial force at normal temperature, which in turn leads to increased friction at normal temperature. In addition, a single sealing lip is extremely susceptible to a lot of wear and "air leakage" under high temperature and high pressure, and its service life is not long. Summary of the invention

[0004] The object of the present invention is to provide a valve oil seal to solve the problem in the above background technology that during use, the leakage of an existing valve oil seal with adjustable leakage is controlled by a self-tightening spring, and the increase in working temperature causes the radial force to decrease, thereby causing the sealing lip to fail. In order to compensate for the reduction in radial force caused by the temperature increase, a general valve oil seal tightens the radial force at room temperature, which in turn leads to increased friction at room temperature. In addition, a single sealing lip is extremely susceptible to a large amount of wear and "gas leakage" under high temperature and high pressure, resulting in the inability to adjust the leakage and a short service life.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a valve oil seal with adjustable leakage, comprising a reinforcement skeleton, the inner wall of the reinforcement skeleton is fixedly connected to a rubber body, the outer wall of the rubber body is provided with a first spring groove near the top of the reinforcement skeleton, the inner wall of the first spring groove is provided with a self-locking spring structure, the outer wall of the self-locking spring structure is sleeved and tightly matched with the inner wall of the first spring groove, the inner wall of the rubber body is provided with a main sealing lip near the inner wall of the self-locking spring structure, the inner wall of the rubber body is provided with a protective structure near the bottom of the main sealing lip, the bottom of the reinforcement skeleton is fixedly connected to an adjustment ring, the bottom of the adjustment ring is fixedly connected to a fixing ring, the outer wall of the reinforcement skeleton is provided with a second spring groove near the top of the adjustment ring, the inner wall of the second spring groove is provided with an adjustment spring, the outer wall of the adjustment spring is sleeved and tightly matched with the inner wall of the second spring groove.

[0006] Preferably, a dust lip is provided on the inner wall of the rubber body near the top of the main sealing lip, a first concave cavity is formed in the gap between the main sealing lip and the dust lip, and a second concave cavity is formed in the gap between the main sealing lip and the protective structure.

[0007] Preferably, the interior of the self-locking spring structure includes an oil sealing spring, the outer wall of the oil sealing spring is sleeved with the inner wall of the first spring groove, and a first limiting ring is provided on the inner wall of the oil sealing spring close to the rubber body, and the outer wall of the first limiting ring is sleeved with the inner wall of the oil sealing spring.

[0008] Preferably, a second limiting ring is arranged inside the oil seal spring away from the rubber body, and the outer wall of the second limiting ring is sleeved with the inner wall of the first limiting ring.

[0009] Preferably, the interior of the protective structure includes a buffer lip and a heat-insulating lip, the buffer lip is opened directly below the main sealing lip, and the heat-insulating lip is opened directly below the buffer lip.

[0010] Preferably, the first limiting ring and the second limiting ring are made of two-way memory alloy.

[0011] Preferably, the upper air surface angle of the main sealing lip is 20 degrees, and the lower oil surface angle of the main sealing lip is 290 degrees.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The minimum diameter of the main sealing lip can be adjusted by setting the adjusting spring and adjusting ring. The force of the reinforcing frame can be adjusted by replacing the adjusting spring, so that the adjusting ring will be slightly deformed, thereby changing the fitting clearance of the main sealing lip and making the main sealing lip produce an interference fit, so as to achieve the effect of adjustable leakage and strong practicality.

[0014] 2. The friction force is reduced by the coordinated use of the dustproof lip, buffer lip, heat-insulating lip, first limit ring and second limit ring, and the dustproof lip is used to scrape the valve guide and external dust to prevent dust and impurities from aggravating the loss of the main sealing lip, and the heat-insulating lip can block the high temperature of the engine during operation, so that the internal main sealing lip is in a better environment, and the buffer lip can play a buffering role when the valve oil seal reciprocates, preventing high pressure from directly acting on the main sealing lip, causing the main sealing lip to have an unbalanced pressure load and cause air leakage. When the temperature rises, the first limit ring will shrink inward to increase the radial force and prevent oil leakage. At room temperature, the second limit ring will expand outward to reduce the radial force and prevent wear. The first cavity and the second cavity can also store oil to maintain long-term lubrication and reduce friction, so that the valve oil seal has strong environmental adaptability and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is a bottom view structural schematic diagram of the present invention;

[0017] Figure 3 It is a cross-sectional structural schematic diagram of the present invention;

[0018] Figure 4 It is an enlarged schematic diagram of the structure at location A of the present invention.

[0019] In the figure: 1. Strengthening skeleton; 2. Rubber body; 3. Self-locking spring structure; 4. First spring groove; 5. Second spring groove; 6. Adjustment spring; 7. Adjustment ring; 8. Fixing ring; 9. Main sealing lip; 10. Dustproof lip; 11. Buffer lip; 12. Insulation lip; 13. Oil seal spring; 14. First limiting ring; 15. Second limiting ring; 16. First concave cavity; 17. Second concave cavity; 18. Protection structure. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-4 The present invention provides a technical solution: a leakage adjustable valve oil seal, comprising a reinforcement skeleton 1, a rubber body 2 is fixedly connected to the inner wall of the reinforcement skeleton 1, a first spring groove 4 is opened on the outer wall of the rubber body 2 near the top of the reinforcement skeleton 1, a self-locking spring structure 3 is arranged on the inner wall of the first spring groove 4, the outer wall of the self-locking spring structure 3 is sleeved and tightly matched with the inner wall of the first spring groove 4, a main sealing lip 9 is arranged on the inner wall of the rubber body 2 near the self-locking spring structure 3, a protective structure 18 is arranged on the inner wall of the rubber body 2 near the bottom of the main sealing lip 9, an adjusting ring 7 is fixedly connected to the bottom of the reinforcement skeleton 1, a fixing ring 8 is fixedly connected to the bottom of the adjusting ring 7, a second spring groove 5 is opened on the outer wall of the reinforcement skeleton 1 near the top of the adjusting ring 7, an adjusting spring 6 is arranged on the inner wall of the second spring groove 5, and the outer wall of the adjusting spring 6 is sleeved and tightly matched with the inner wall of the second spring groove 5.

[0022] In this embodiment, the force applied to the reinforcing frame 1 is adjusted by replacing the adjustment spring 6, causing the adjustment ring 7 to deform slightly, thereby changing the fitting clearance at the main sealing lip 9 and creating an interference fit at the main sealing lip 9 to achieve an adjustable leakage effect.

[0023] Specifically, a dust lip 10 is provided on the inner wall of the rubber body 2 near the top of the main sealing lip 9 , a first concave cavity 16 is formed in the gap between the main sealing lip 9 and the dust lip 10 , and a second concave cavity 17 is formed in the gap between the main sealing lip 9 and the protective structure 18 .

[0024] In this embodiment, the first cavity 16 and the second cavity 17 can also store engine oil to maintain long-term lubrication and reduce friction.

[0025] Specifically, the interior of the self-locking spring structure 3 includes an oil sealing spring 13, the outer wall of the oil sealing spring 13 is sleeved with the inner wall of the first spring groove 4, and a first limiting ring 14 is provided on the inner wall of the oil sealing spring 13 close to the rubber body 2, and the outer wall of the first limiting ring 14 is sleeved with the inner wall of the oil sealing spring 13.

[0026] In this embodiment, when the temperature rises, the first limiting ring 14 will shrink inwards, thereby increasing the radial force and preventing oil leakage.

[0027] Specifically, a second limiting ring 15 is disposed inside the oil seal spring 13 away from the rubber body 2 , and the outer wall of the second limiting ring 15 is sleeved with the inner wall of the first limiting ring 14 .

[0028] In this embodiment, at room temperature, the second limiting ring 15 will expand outwards again, so that the radial force is reduced and severe wear is prevented.

[0029] Specifically, the interior of the protective structure 18 includes a buffer lip 11 and a heat-insulating lip 12 . The buffer lip 11 is opened directly below the main sealing lip 9 , and the heat-insulating lip 12 is opened directly below the buffer lip 11 .

[0030] In this embodiment, the buffer lip 11 can play a buffering role when the valve oil seal reciprocates, preventing high pressure from directly acting on the main sealing lip 9 and causing the pressure load of the main sealing lip 9 to be unbalanced and cause air leakage.

[0031] Specifically, the first limiting ring 14 and the second limiting ring 15 are made of a two-way memory alloy.

[0032] In this embodiment, the two-way memory alloy can produce different shapes at room temperature and high temperature, so that the valve oil seal automatically adjusts the radial force and has strong environmental adaptability.

[0033] Specifically, the upper air surface angle of the main sealing lip 9 is 20 degrees, and the lower oil surface angle of the main sealing lip 9 is 290 degrees.

[0034] In this embodiment, a smaller air surface angle is combined with a larger oil surface angle, so that the sealing performance of the device is better.

[0035] The working principle and use process of the present invention are as follows: the main sealing lip 9 is used to seal the engine oil, the dustproof lip 10 is used to scrape the dust on the valve guide rod and the outside to prevent dust and impurities from aggravating the loss of the main sealing lip 9, and the heat-insulating lip 12 can block the high temperature of the engine during operation, so that the internal main sealing lip 9 is in a better environment, and the buffer lip 11 can play a buffering role when the valve oil seal reciprocates, preventing high pressure from directly acting on the main sealing lip 9 to cause the load pressure of the main sealing lip 9 to be unbalanced and cause gas leakage. When the temperature rises, the first limit ring 14 will shrink inwards to increase the radial force to prevent the engine from In case of oil leakage at room temperature, the second limit ring 15 will expand outward again, so that the radial force is reduced to prevent severe wear, and the first cavity 16 and the second cavity 17 can also store engine oil to maintain long-term lubrication and reduce friction, so that the valve oil seal has strong environmental adaptability and long service life. The product can automatically adjust the radial force. When a larger fitting clearance appears, the force of the reinforcing skeleton 1 can be adjusted by replacing the adjustment spring 6, so that the adjustment ring 7 is slightly deformed, thereby changing the fitting clearance at the main sealing lip 9, and causing an interference fit at the main sealing lip 9 to achieve an effect of adjustable leakage.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve oil seal with adjustable leakage, comprising a reinforced frame (1), characterized in that: The inner wall of the reinforcing frame (1) is fixedly connected to a rubber body (2); a first spring groove (4) is provided on the outer wall of the rubber body (2) near the top of the reinforcing frame (1); a self-locking spring structure (3) is provided on the inner wall of the first spring groove (4); the outer wall of the self-locking spring structure (3) is sleeved and tightly matched with the inner wall of the first spring groove (4); a main sealing lip (9) is provided on the inner wall of the rubber body (2) near the self-locking spring structure (3); a protective structure (18) is provided on the inner wall of the rubber body (2) near the bottom of the main sealing lip (9); an adjustment ring (7) is fixedly connected to the bottom of the reinforcing frame (1); a fixing ring (8) is fixedly connected to the bottom of the adjustment ring (7); a second spring groove (5) is provided on the outer wall of the reinforcing frame (1) near the top of the adjustment ring (7); an adjustment spring (6) is provided on the inner wall of the second spring groove (5); the outer wall of the adjustment spring (6) is sleeved and tightly matched with the inner wall of the second spring groove (5); The self-locking spring structure (3) comprises an oil seal spring (13) inside, the outer wall of the oil seal spring (13) being sleeved with the inner wall of the first spring groove (4), the inner wall of the oil seal spring (13) close to the rubber body (2) is provided with a first limiting ring (14), the outer wall of the first limiting ring (14) being sleeved with the inner wall of the oil seal spring (13); A second limiting ring (15) is arranged inside the oil seal spring (13) away from the rubber body (2); the outer wall of the second limiting ring (15) is sleeved with the inner wall of the first limiting ring (14); the first limiting ring (14) and the second limiting ring (15) are made of a two-way memory alloy.

2. The leakage adjustable valve oil seal according to claim 1, characterized in that: A dustproof lip (10) is provided on the inner wall of the rubber body (2) near the top of the main sealing lip (9); a first concave cavity (16) is formed at the gap between the main sealing lip (9) and the dustproof lip (10); and a second concave cavity (17) is formed at the gap between the main sealing lip (9) and the protective structure (18).

3. The leakage adjustable valve oil seal according to claim 2, characterized in that: The interior of the protective structure (18) comprises a buffer lip (11) and a heat-insulating lip (12); the buffer lip (11) is opened directly below the main sealing lip (9); and the heat-insulating lip (12) is opened directly below the buffer lip (11).

4. The leakage adjustable valve oil seal according to claim 1, characterized in that: The upper air surface angle of the main sealing lip (9) is 20 degrees, and the lower oil surface angle of the main sealing lip (9) is 290 degrees.

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