Springless valve oil seal

Abstract

The utility model discloses a spring-free valve oil seal, which comprises a framework and a rubber body, the rubber body covering the inner side of the framework forms a main lip sealing part and a static sealing part, the main lip sealing part mainly controls the leakage rate and comprises a main lip, an air lip and a two-section lip between the main lip and the air lip, the oil surface angle of the main lip is 43 degrees, the lip tip of the main lip is arc-shaped, and the arc R of the main lip is 0.1 mm; and the static sealing part is used for fixing the valve oil seal and the static seal between the valve guide pipe and the valve oil seal. The sealing structure has the characteristics that the product assembly is facilitated, and the sealing stability is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil seals, in particular to a springless valve oil seal. Background Art

[0002] At present, the engine valve oil seal controls the amount of lubricating oil between the valve stem and the valve guide to prevent valve stem sintering, valve guide wear and excessive oil consumption. The current design generally adopts a spring lip sleeve spring structure, referring to Figure 1 The main lip sealing force is provided by the spring, and in order to adapt to the working conditions of high pressure, large eccentricity and high reciprocating speed of the supercharged engine, the valve oil seal main lip is generally designed with an air lip and a second-stage lip. The design is complex in a relatively small space, which is not conducive to product assembly. During the valve stem assembly process and when the valve stem is not lubricated enough, the rubber is prone to deformation, causing the spring to fall off, which in turn causes the seal to fail. Solving the spring falling problem and achieving sealing stability is the current problem that needs to be solved. Utility Model Content

[0003] The utility model aims to improve the deficiencies of the prior art and provide a springless valve oil seal which is convenient for product assembly and has good sealing stability.

[0004] The purpose of the utility model is achieved in this way. A springless valve oil seal comprises a skeleton and a rubber body, wherein the rubber body covering the inner side of the skeleton forms a main lip sealing portion and a static sealing portion. The main lip sealing portion mainly controls the leakage amount and comprises a main lip, an air lip and a two-section lip between the main lip and the air lip. The oil surface angle of the main lip is 43°, and the lip tip of the main lip is arc-shaped with an arc R of 0.1 mm. The static sealing portion is used to fix the valve oil seal and the static seal between the valve guide and the valve oil seal.

[0005] Compared with the prior art, the utility model has the following significant features and positive effects: compared with the traditional valve oil seal, the utility model removes the spring component and realizes a springless design. On the one hand, the springless design ensures that there is no problem of spring falling during assembly and actual use, and avoids the risk of increased leakage after the spring falls; on the other hand, the springless design reduces one component, eliminates the process of spring sleeve inspection, and greatly reduces the production cost; the rubber body is divided into a main lip sealing part and a static sealing part. The main lip sealing part mainly plays the role of controlling the leakage amount. On the one hand, it ensures a certain leakage amount to form lubrication between the oil seal and the valve stem, and on the other hand, the leakage amount cannot be too large, and a large leakage amount will cause problems such as burning oil and carbon deposition; the static sealing part, on the one hand, fixes the valve oil seal and ensures the coaxiality between the valve oil seal and the valve guide, and on the other hand, plays a static sealing role between the valve guide and the valve oil seal. In order to meet the above requirements, the main lip oil surface angle A is larger than the spring valve oil seal structure design, and is designed to be 43°; the main lip tip arc R is smaller, and is designed to be 0.1mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0007] Figure 1 It is a structural schematic diagram of the prior art of the utility model.

[0008] Figure 2 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0009] A springless valve oil seal, referring to Figure 2 , consisting of a skeleton 3 and a rubber body 2. The rubber body 2 is divided into a main lip sealing part 4 and a static sealing part 5. The main lip sealing part 4 is directly supported by the skeleton 3 and cooperates with the valve stem to form a dynamic seal. The main lip sealing part 4 is composed of a main lip 6, a second-stage lip 7, and an air lip 8 from top to bottom. The main lip 6 plays a sealing "oil scraping" role, the second-stage lip 7 plays a role in supporting the main lip 6 to ensure the concentricity requirement, and the air lip 8 plays a role in resisting pressure and preventing the main lip from opening and leaking. The main lip 6, the second-stage lip 7, and the air lip 8 work together to play a sealing role. The oil surface angle of the main lip 6 is 43°, and the lip tip of the main lip 6 is arc-shaped, and its arc R is 0.1mm; the static sealing part 5 is a static lip, which forms a static seal with the valve guide under the action of the skeleton 3. To the product cavity 7, the upper mold 1 and the middle mold 3 are matched through a 15° conical surface clearance, and the lower mold 4 and the lower mold core 5 are matched through 15° and 16° conical surfaces at the dust lip formation position, that is, the lower mold 4 has a slope of 15°, and the lower mold core 5 has a slope of 16°. The product dust lip is made by interference fit between the lower mold 4 and the lower mold core 5, and is formed in one time, and the subsequent size is stable.

Claims

1. A springless valve oil seal, comprising a frame and a rubber body, characterized in that: The rubber body covering the inner side of the skeleton forms a main lip sealing part and a static sealing part. The main lip sealing part mainly controls the leakage, and includes a main lip, an air lip and a two-section lip between the main lip and the air lip. The oil surface angle of the main lip is 43°, and the lip tip of the main lip is arc-shaped with an arc R of 0.1mm. The static sealing part is used to fix the valve oil seal and the static seal between the valve guide and the valve oil seal.

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