What are the factors that affect the oil seal effect?

The Skeleton Oil Seal is a typical representative of the oil seal. Generally speaking, the oil seal refers to the skeleton oil seal. The effect of the oil seal is generally to block the parts that need to be lubricated in the transmission parts from the output parts, so as to prevent the leakage of lubricating oil. The skeleton is like the steel bar inside the concrete member, which has the effect of strengthening and enables the oil seal to maintain its shape and tension. According to the structure method, it can be divided into single lip skeleton oil seal and double lip skeleton oil seal. The auxiliary lip of the double-lip skeleton oil seal has a dust-proof effect to prevent external dust and impurities from entering the machine. According to the skeleton type, it can be divided into inner skeleton oil seal, exposed skeleton oil seal and equipment oil seal. According to the working conditions, it can be divided into rotary skeleton oil seal and reciprocating skeleton oil seal.

Different categories are distinguished according to different types. The first thing to talk about today is the skeleton oil seal. The skeleton oil seal structure consists of three parts: the oil seal body, the reinforcing skeleton and the self-tightening coil spring. The sealing body is divided into bottom, waist, cutting edge and sealing lip according to different parts. Generally, the inner diameter of the skeleton oil seal under free conditions is smaller than the shaft diameter, that is, it has a certain "interference".

Therefore, after the oil seal is installed on the oil seal seat and the shaft, the pressure of the oil seal edge and the shortening force of the self-tightening coil spring generate a certain radial tightening force on the shaft. After a period of operation, the pressure will rapidly decrease or even disappear, so adding a spring can compensate for the self-tightening force of the oil seal at any time.

Therefore, when installing, it is necessary to apply some oil on the sealing ring to ensure that the skeleton oil seal and the shaft center line are straight. If it is not straight, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also cause the sealing lip to be damaged. Excessive wear. During operation, the lubricant in the housing oozes out a little to reach a condition where an oil film is formed at the sealing surface.