Novel oil seal

Abstract

The invention discloses a novel oil seal which comprises an oil seal body. The oil seal body is of an annular structure with a U-shaped groove formed in the end face, an inner ring for being clamped to a rotating shaft and an outer ring for being installed in a shaft hole in a matched mode are formed in the oil seal body, an oil return hole is formed in the groove bottom of the U-shaped groove, acover body which can cover the oil return hole and does not prevent the oil seal body from being assembled on the rotating shaft is integrally formed on the outer side surface of the groove bottom ofthe U-shaped groove, and an oil collecting groove communicating with the oil return hole is formed between the bottom wall of the cover body and the groove bottom of the U-shaped groove. Two seals aredesigned on the oil seal by utilizing the design concept of catching-escapement combination and looseness without miss, the second open seal is started when the first closed seal fails, so that sealing without oil leakage is realized. In addition, due to the existence of the second open seal, the requirement for the closed seal manufacturing of the oil seal is greatly lowered, and the manufacturing cost is greatly reduced.

Description

technical field [0001] The present invention relates to an oil seal, more specifically, to a novel oil seal. Background technique [0002] At present, the principle of high-speed rotary oil seal used in domestic engines is to use the high elasticity of rubber to make the lip of the oil seal have a large radial holding force on the shaft, so that the lip of the oil seal is always close to the surface of the shaft. And maintain the tight force, to achieve sealing. Therefore, a large friction force will be generated between the lip and the rotating shaft, resulting in the following defects: first, the wear of the lip and the shaft is accelerated, and the life of the oil seal is reduced; second, a large friction temperature rise and friction torque are generated, which consume extra In order to improve wear resistance and service life, generally only replaceable rubber materials can be used, such as nitrile rubber upgraded to fluorine rubber or even better composite materials, ...

AI Technical Summary

Problems solved by technology

Therefore, a large friction force will be generated between the lip and the rotating shaft, resulting in the following defects: one is to accelerate the wear of the lip and the shaft and reduce the life of the oil seal; the other is to generate a large friction temperature rise and friction torque, which consumes extra In order to improve wear resistance and service life, generally only replaceable rubber materials can be used, such as nitrile rubber upgraded to fluorine rubber or even better composite materials, but the cost is greatly increased; at the same time, the design according to the above principles The oil seal is also limited by the installation eccentricity and the amount of shaft runout, so it must be used under the condition of improving the manufacturing and assembly accuracy of parts

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