Sealing principle of Simmerring Oil Seal: Due to the existence of oil film controlled by the oil seal edge between the oil seal and the shaft, this oil film has fluid lubrication characteristics.
Analysis of sealing principle: the stiffness of the oil film under the action of the skeleton oil seal just makes a crescent surface at the contact end of the oil film and air, which prevents the leakage of the working medium and thus realizes the sealing of the rotating shaft. the sealing capacity of the oil seal depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the oil seal will leak; if the thickness is too small, dry friction may occur, causing the oil seal and the shaft to wear; if there is no oil film between the sealing lip and the shaft, it is easy to cause heat and wear. Therefore, during installation, some oil must be applied to the seal ring, and at the same time, ensure that the skeleton oil seal is perpendicular to the shaft centerline; if it is not perpendicular, the sealing lip of the oil seal will drain the lubricant from the shaft, which will also lead to excessive wear of the sealing lip. during operation, the lubricant in the shell slightly seeps out a little to reach the formation at the sealing surface.