NEWS

Silicone rubber skeleton oil seals are typical representatives of oil seals. Generally speaking, when people talk about oil seals, they refer to skeleton oil seals. The general function of an oil seal is to isolate the components in the transmission system that require lubrication from the power output components, preventing the leakage of lubricating oil. The skeleton is like the steel bars inside a concrete component, playing a reinforcing role and enabling the oil seal to maintain its shape and tension. According to the structural form, it can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of the double-lip skeleton oil seal serves to prevent dust and impurities from the outside from entering the machine interior. According to the type of skeleton, they can be classified into inner skeleton oil seals, exposed skeleton oil seals and assembled oil seals. According to working conditions, they can be classified into rotary skeleton oil seals and reciprocating skeleton oil seals. It is used in parts such as gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, etc.

The structure of the skeleton oil seal consists of three parts: the oil seal body, the reinforcing skeleton and the self-tightening helical spring. The sealing body is further classified into the bottom, waist, cutting edge and sealing lip, etc. according to different parts. Generally, in a free state, the inner diameter of a skeleton oil seal is smaller than the shaft diameter, that is, it has a certain "interference fit".

Therefore, after the oil seal is installed in the oil seal seat and on the shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening helical spring exert a certain radial tightening force on the shaft. After a period of operation, this pressure will rapidly decrease or even disappear. Thus, adding a spring can compensate for the self-tightening force of the oil seal at any time