A static seal oil seal for an engine cover

Abstract

This utility model patent relates to the field of sealing technology for engine hoods, specifically a static sealing oil seal for engine hoods. It includes a U-shaped rubber ring, a skeleton embedded in the outer wall of the rubber ring, and an inner liner ring embedded in the inner wall of the rubber ring. The inner wall of the rubber ring has a main lip and a compensating lip, which are triangular ribs protruding from the inner wall of the rubber ring. The inner liner ring and the main lip are symmetrically arranged on the inner and outer sides of the lower end of the rubber ring. The upper end of the rubber ring has an arc-shaped bent section, the other end of which connects to an outer support section. The skeleton is embedded in the support section. This oil seal provides a clamping force on the shaft through the main lip and the compensating lip, achieving a static seal. The bent section allows the main lip and the compensating lip to be compressed and stretched with the shaft, compensating for eccentric errors during oil seal assembly, giving the oil seal a certain degree of eccentricity tolerance and strong resistance to eccentricity.

Description

Technical Field

[0001] This utility model patent relates to the field of sealing technology for engine covers, specifically a static sealing oil seal for engine covers. Background Technology

[0002] With the continuous advancement of engine technology in the aviation, marine, and automotive sectors, the sealing capabilities of engine cover oil seals, a crucial component, require corresponding improvements. This creates an urgent market demand for research into oil resistance, pressure resistance, eccentricity resistance, and automated manufacturing of engine cover oil seals. Based on whether there is relative movement between the sealing components, engine oil seals can be divided into two types: static seal oil seals and dynamic seal oil seals. A static seal is an oil seal where the sealing components remain in a fixed state with no relative displacement. Chinese patent application CN119123065A discloses an "Engine Oil Seal and Production Testing Equipment and Testing Method," which includes a rubber ring. A sealing lip is fixedly installed at the center of the inner side of the rubber ring, and an annular groove is provided between the rubber ring and the sealing lip. A dustproof lip is provided on the outer surface of one end of the sealing lip, and the outer surface of the dustproof lip is inclined. A first spring is fitted onto the outer surface of the sealing lip, and the outer surface of the sealing lip has a groove for cooperating with the first spring. A metal skeleton is wrapped around the inner surface of the rubber ring, and the cross-section of the metal skeleton is L-shaped. This oil seal can provide a certain degree of dust prevention and sealing, but its resistance to eccentricity is weak, and the first spring is exposed and lacks corrosion resistance. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to improve the oil seal lip's resistance to eccentricity, resistance to internal engine pressure, and resistance to corrosion from internal engine oil, oil-gas mixture, etc., while meeting the basic sealing requirements, so as to meet the operating requirements of the engine.

[0004] The technical solution adopted by this utility model to solve the technical problem is:

[0005] The static sealing oil seal for an engine cover of this utility model includes a rubber ring with a U-shaped cross-section, a skeleton embedded in the outer wall of the rubber ring, and an inner liner ring embedded in the inner wall of the rubber ring. The inner wall of the rubber ring is provided with a main lip and a compensating lip. The main lip and the compensating lip are triangular ribs protruding from the inner wall of the rubber ring. The inner liner ring and the main lip are symmetrically arranged on the inner and outer sides of the lower end of the rubber ring. The upper end of the rubber ring is provided with an arc-shaped bent section. The other end of the bent section is connected to an outer support section. The skeleton is embedded in the support section.

[0006] This design utilizes the main lip and the compensating lip to provide clamping force on the shaft, achieving a static seal. When the main lip undergoes compression deformation over a long period, the compensating lip adheres to the shaft surface to compensate for the seal. The bent section at the upper end of the rubber ring allows the main lip and the compensating lip to undergo compression and stretching with the shaft, compensating for eccentricity errors during oil seal assembly. This gives the oil seal a certain degree of eccentricity tolerance and strong resistance to eccentricity.

[0007] Preferably, the cross-section of the skeleton is L-shaped, with one end horizontally positioned and embedded in the bending section, and the other end vertically positioned and embedded in the support section; a rectangular annular groove is provided between the upper end of the support section and the bending section, and the annular groove is located above the skeleton.

[0008] This design ensures sufficient support between the support section and the bending section.

[0009] Preferably, the outer wall of the support section is provided with a corrugated annular groove, and the lower end of the support section is provided with a smoothly transitioned rounded corner.

[0010] With this solution, the concave-convex ring groove can be used with the oil seal seat hole of aluminum shell and plastic shell, which is easy to assemble and will not come off.

[0011] Preferably, the outer side wall of the rubber ring is provided with a first support ring, which covers the outside of the inner liner ring; the inner side wall of the support section is provided with a second support ring, and multiple protrusions are evenly distributed along the circumference on the outer walls of the first and second support rings.

[0012] This solution precisely fixes the metal skeleton and inner lining ring into the rubber material, making it more resistant to oil and gas corrosion and extending its service life.

[0013] Thanks to the aforementioned structure, this oil seal provides a clamping force on the shaft through the main lip and the compensating lip, achieving a static seal. The compensating lip compensates for the seal's eccentricity, improving its sealing effect. The bent section at the upper end of the rubber ring allows the main lip and the compensating lip to compress and stretch with the shaft, compensating for eccentricity errors during oil seal assembly. This gives the oil seal a certain degree of eccentricity tolerance and strong resistance to eccentricity. The skeleton and inner liner ring are enclosed in rubber material, making them more resistant to oil and gas corrosion and extending their service life. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of one embodiment of the present invention. Detailed Implementation

[0015] 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.

[0016] The static sealing oil seal for an engine cover described in this utility model is made of materials such as ethylene acrylate rubber and fluororubber, and meets the working environment requirements of -40-150℃. It is circular in shape, installed in an oil seal seat, and tightly clamped to the shaft end. For example... Figure 1 As shown, the static sealing oil seal for an engine cover of this utility model, viewed in cross-section, includes a U-shaped rubber ring 3, a skeleton 1 embedded in the outer wall of the rubber ring 3, and an inner liner ring 2 embedded in the inner wall of the rubber ring 3. The skeleton 1 and the inner liner ring 2 are steel ring structures with high strength and a certain degree of elasticity. The skeleton 1, the inner liner ring 2, and the rubber ring 3 are combined together by high-temperature vulcanization.

[0017] When installed on the shaft end, the inner wall of the rubber ring 3 directly contacts the shaft end. In this embodiment, the inner wall of the rubber ring 3 is a slope. In its natural state, the distance from the upper end of the slope to the shaft center is greater than the distance from the lower end to the shaft center. The inner wall of the rubber ring 3 is provided with a main lip 31 and a compensating lip 32. The main lip 31 and the compensating lip 32 are triangular ribs protruding from the inner wall of the rubber ring 3. The inner liner ring 2 and the main lip 31 are symmetrically arranged on the inner and outer sides of the lower end of the rubber ring 3. The compensating lip 32 is located above the main lip 31, and the distance from the main lip 31 to the shaft center is less than the distance from the compensating lip 32 to the shaft center. In other words, when the oil seal is installed on the shaft end, the main lip 31 fits more tightly to the shaft end, and the compensating lip 32 and the main lip 31 together form a double-layer seal. After installation, the compensation lip 32 and the main lip 31 remain stationary relative to the shaft end, sealing the engine oil and oil vapor inside, and can withstand pressures of -20 to 100 kPa.

[0018] In addition, the upper end of the rubber ring 3 is provided with an arc-shaped bent section 4. The thickness of the bent section 4 is less than that of the lower end of the rubber ring 3 corresponding to the inner wall of the rubber ring 3. Compared with the lower end of the rubber ring 3, the bent section 4 is easier to bend under compressive force, providing better follow-up. When there is a certain eccentricity between the shaft end and the oil seal seat hole, the bent section 4 bends and deforms, providing the sealing lip with the offset performance of the shaft end, maintaining the sealing performance. The static sealing oil seal for the engine cover of this embodiment can meet the assembly eccentricity requirement of 2-4mm.

[0019] The other end of the bent section 4 is connected to the outer support section 5, and the skeleton 1 is embedded in the support section 5. The skeleton 1 has an L-shaped cross-section, with one end horizontally positioned and embedded in the bent section 4, and the other end vertically positioned and embedded in the support section 5. A rectangular annular groove 6 is provided between the upper end of the support section 5 and the bent section 4, and the annular groove 6 is located above the skeleton 1. The horizontal extension at the upper end of the skeleton 1 increases the distance between the support section 5 and the inner lining ring 2, and the annular groove 6 at the upper end of the support section 5 reduces the thickness of the rubber covering layer at this point, which can prevent the rubber layer from being squeezed, cracked, or peeled due to bending.

[0020] As a further improvement of this utility model, the outer wall of the support section 5 is provided with a corrugated annular groove 7, and the lower end of the support section 5 is provided with a smoothly transitioned rounded corner 8. The corrugated annular groove 7 can fit tightly with the inner wall of the oil seal seat, which can meet the requirements of aluminum shell and plastic shell oil seal seats, and is easy to assemble and will not fall out. The rounded corner 8 makes it easier to install the oil seal vertically into the oil seal seat.

[0021] To further improve the corrosion resistance of the oil seal, especially the inner liner ring 2 and the skeleton 1, a first support ring 9 is provided on the outer wall of the rubber ring 3, covering the outer side of the inner liner ring 2; a second support ring 10 is provided on the inner wall of the support section 5, and multiple bosses are evenly distributed along the circumference on the outer walls of the first and second support rings 9 and 10. The inner liner ring 2 and the skeleton 1 are respectively covered by the first and second support rings 9 and 10, which avoids the metal parts being exposed, allowing the oil seal to be completely vulcanized and wrapped in rubber, making it more resistant to oil and gas corrosion and extending its service life. During the production process, the bosses on the outer walls of the first and second support rings 9 and 10 serve a positioning function, fixing the inner liner ring 2 and the skeleton 1 in their positions within the mold.

[0022] In use, the engine cover of this invention is embedded into the oil seal seat using a static sealing oil seal, so that the concave-convex annular groove 7 on the outer wall of the support section 5 is tightly pressed against the inner wall of the oil seal seat. Due to the extrusion force of the interference fit, the concave-convex annular groove 7 on the outer wall of the rubber support section 5 is flattened, and the support section 5 is tightly pressed against the inner wall of the oil seal seat. On the other hand, on the inner side of the oil seal, the inner wall of the rubber ring 3 is tightly clamped to the shaft end to be sealed, and is also subjected to the extrusion force of the interference fit. Although the protruding main lip 31 and compensating lip 32 on the rubber ring 3 are flattened, the contact parts of the main lip 31 and compensating lip 32 with the shaft end form two annular high-pressure zones around the shaft end, which play a sealing role and seal the engine oil and oil vapor inside the engine. When there is a certain eccentricity between the shaft end and the oil seal seat hole, the bending section 4 is appropriately bent and deformed, and the center of the main lip 31 and compensating lip 32 is slightly offset, but the sealing performance is still maintained.

[0023] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A static sealing oil seal for an engine hood, comprising a U-shaped rubber ring (3), a skeleton (1) embedded in the outer wall of the rubber ring (3), and an inner liner ring (2) embedded in the inner wall of the rubber ring (3), characterized in that, The inner wall of the rubber ring (3) is provided with a main lip (31) and a compensation lip (32). The main lip (31) and the compensation lip (32) are triangular ribs protruding from the inner wall of the rubber ring (3). The inner lining ring (2) and the main lip (31) are symmetrically arranged on the inner and outer sides of the lower end of the rubber ring (3). The upper end of the rubber ring (3) is provided with an arc-shaped bending section (4). The other end of the bending section (4) is connected to the outer support section (5). The skeleton (1) is embedded in the support section (5).

2. The static sealing oil seal for an engine cover according to claim 1, characterized in that, The cross-section of the skeleton (1) is L-shaped, with one end set horizontally and embedded in the bending section (4), and the other end set vertically and embedded in the support section (5); a rectangular annular groove (6) is provided between the upper end of the support section (5) and the bending section (4), and the annular groove (6) is located above the skeleton (1).

3. A static sealing oil seal for an engine cover according to claim 1 or 2, characterized in that, The outer wall of the support section (5) is provided with a corrugated concave-convex annular groove (7), and the lower end of the support section (5) is provided with a smooth transition rounded corner (8).

4. A static sealing oil seal for an engine cover according to claim 1 or 2, characterized in that, The outer side wall of the rubber ring (3) is provided with a first support ring (9), which covers the outside of the inner lining ring (2); the inner side wall of the support section (5) is provided with a second support ring (10), and multiple protrusions are evenly distributed along the circumference on the outer walls of the first support ring (9) and the second support ring (10).

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