With the development of social development and the progress of science and technology, although some technologies in developing countries far exceed those in developed countries, developed countries still have the advantage in some key technologies. Among them, the imported bearing skeleton is constantly used, and now I will talk about the structure and principle for you.
The structure and sealing principle of SKF imported bearing skeleton oil seal:
SKF imported bearing skeleton oil seal is relatively simple, generally composed of three parts: oil seal body, reinforced skeleton and self-tightening spiral spring. The sealing body is divided into the bottom, waist, cutting edge and sealing lip according to different parts. Generally, in the free condition of SKF imported bearing skeleton oil seal, its inner diameter is smaller than the shaft diameter, that is, it has a certain "interference quantity".
Therefore, when the SKF imported bearing skeleton oil seal is loaded into the oil seal seat and shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening spiral spring have a certain radial tightening force on the shaft, and after running for a period of time, the pressure will be rapidly reduced or even disappear, so that the spring can compensate the self-tightening force of the oil seal at any time.
Sealing principle:
Since there is an oil film operated by the edge of the oil seal between the SKF imported bearing skeleton oil seal and the shaft, the oil film has a fluid smooth property. Under the effect of liquid surface tension, the stiffness of the oil film just makes the oil film and the air touch end form a crescent surface, avoiding the leakage of the working medium, and then completing the sealing of the rotating shaft.
The sealing ability of SKF imported bearing skeleton oil seal depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the oil seal leaks; If the thickness is too small, dry conflict may occur, causing oil seal and shaft wear; There is no oil film between the seal lip and the shaft, which is easy to cause heat and wear.
Therefore, in the installation, it is necessary to apply some oil on the sealing ring to ensure that the SKF bearing skeleton oil seal and the shaft line are straight, if not straight, the sealing lip of the oil seal will drain the smooth oil from the shaft, which will also lead to excessive wear of the sealing lip. During operation, the smoothing agent in the shell gently exudes a little to reach the condition of forming an oil film at the sealing surface.