The Sealing Principle And Performance Of The Skeleton Oil Seal

[Simple overview] The sealing principle and performance of the skeleton oil seal

Source: Guangdong Dongsheng Sealing Technology Co., Ltd.-www.dshmf.com

The structure of the skeleton oil is actually very simple, generally composed of three parts, they are the oil seal body, the reinforcing skeleton and the self-tightening coil spring.The sealing body can be divided into bottom, waist, cutting edge and sealing lip according to different parts. Whether its structural design is reasonable will directly affect the "sealing effect" of the oil seal. Consideration will improve the sealing performance! So we must first understand how the skeleton oil seal works? What is the performance of the skeleton oil seal?

I. How does the skeleton oil seal work? What is the sealing principle?

When the skeleton oil seal is in a free state, the inner diameter of the oil seal lip is smaller than the shaft diameter and has a certain amount of interference. After installation, the interference pressure of the oil seal edge will generate a certain radial tightening force on the rotating shaft. After a period of movement, the pressure will decrease rapidly, and the contraction force of the self-tightening coil spring can compensate for the self-tightening force of the oil seal at any time, and the two work together to generate radial pressure. During operation, under the action of radial pressure, the oil seal lip forms a sealing ring belt with a width of 0.25-0.5mm. Under the action of lubricating oil pressure, the oil penetrates between the cutting edge and the rotating shaft to form a very thin layer- oil film. Prevent the leakage of the working medium, so as to realize the sealing of the rotating shaft.

II. What is the sealing performance of the skeleton oil seal?

1.The sealing ability of the skeleton oil seal depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the skeleton oil seal leaks.

2. If the thickness is too small, dry friction may occur, causing wear of the oil seal and the rotating shaft.

3. There is no oil film between the sealing lip and the shaft, which is easy to cause heat generation and early wear.

4. The skeleton oil seal and the sleeve center line must be vertical. If it is not vertical, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also cause excessive wear of the sealing lip.