Automobile crankshaft oil seal of novel structure

Abstract

The invention discloses an automobile crankshaft oil seal of a novel structure. The automobile crankshaft oil seal of the novel structure comprises an annular metallic framework with a two-step-shaped cross section. A vulcanized rubber covering layer is attached to the vertical surface and the bottom surface of a lower step of an outer ring of the annular metallic framework. A rubber sealing lip supporting body with an n-shaped cross section is attached to the lower step surface and the vertical surface of an upper step of an inner ring of the annular metallic framework. The surface of an inner ring of the sealing lip supporting body is provided with a filling modification teflon face seal lip. An elastic delivery rubber layer is arranged between the filling modification teflon face seal lip and the lower end face of the upper step surface of the annular metallic framework. The automobile crankshaft oil seal of the novel structure is ingenious in structure, more durable and better in sealing performance.

Description

technical field [0001] The invention relates to an automobile crankshaft oil seal with a novel structure, belonging to the technical field of shaft sealing structures. Background technique [0002] The crankshaft oil seal is an indispensable component in the lubricating devices of various automobile engines. In the existing technology, the commonly used crankshaft oil seal is composed of a metal skeleton, a rubber body with a sealing lip and a spring. The spring and rubber have the The elasticity makes the sealing lip and the rotating shaft tightly contact to prevent the leakage of lubricating oil, and at the same time, it plays an automatic compensation role after the sealing lip is worn. Some oil seals are equipped with a rotating anti-wear sleeve on the lip of the oil seal. The inner diameter of the rotating sleeve and the rotating shaft are pressed into each other. When the rotating shaft rotates, the rotating anti-wear sleeve on the oil seal is driven to rotate. The ou...

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Problems solved by technology

[0003] No matter what design structure is adopted, this type of rubber oil seal cannot overcome the high-speed operation of the engine crankshaft. In the high-temperature working environment, the friction movement between the rubber and the rotating shaft also quickly produces wear under high-heat conditions. At the same time, due to rubber friction If the coefficient is too large and the strength is not high, it is necessary to use a spring to increase the shaft holding force of the rubber, which further increases the friction coefficient of the rubber and accelerates the wear of the main rubber lip in the process of sealing relative to the rotating shaft. It leads to dry burning carbonization and leakage. This defect is present at home and abroad. Regardless of any design structure of the rubber crankshaft oil seal, it has been unable to solve this rubber seal defect. This is also the root cause of the short working life of the rubber oil seal.

[0004] Today's engine crankshaft oil seals also have a main lip sealing surface made of polytetrafluoroethylene material, but this type of polytetrafluoroethylene crankshaft oil seal has a difficult defect that is reversed from the rubber crankshaft oil seal during operation, that is, modified polytetrafluoroethylene , although the performance of high temperature resistance, friction resistance, strength and chemical corrosion resistance is better than that of rubber engine crankshaft oil seal, the polytetrafluoroethylene material used as the sealing lip of the annular surface has extremely poor elasticity, and it is in relative motion with the engine crankshaft. In the sealing working environment, due to wear and tear, automatic compensation cannot be performed, and leakage will occur immediately. Therefore, in the sealing work, for a certain period of time, the wear compensation can only be performed by the shaft holding force whose diameter is smaller than the diameter of the crankshaft. In the relative movement with the crankshaft The purpose of preventing leakage is carried out in the sealing work, but this increases the resistance virtually, and at the same time, the durability is poor. At the same time, due to the inelasticity, the performance with the shaft is extremely poor, and the followability to the beating eccentric operation of the crankshaft rotation is not good. That is, the anti-eccentricity ability is poor. At the same time, due to the lack of elasticity of the annular surface seal during installation, a sheath is required for protection and installation. At the same time, installation tools are required. If there are no installation tools during maintenance and replacement, it is easy to cause the lip of the annular surface seal end face during installation. wreak havoc

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