Oil Seal Working Principle And Oil Seal Oil Leakage Measurements

I.Working principle of the oil seal:

1. In the free state, the inner diameter of the oil seal lip is smaller than the shaft diameter and has a certain amount of interference.

2. After installation, the interference pressure of the oil seal cutting edge and the contraction force of the self-tightening spring generate a certain radial pressure on the rotating shaft.Vacuum_Part.

3. When working, the oil seal lip forms a sealing contact ring of 0.25 to 0.5 mm wide under the action of radial pressure.

Under the action of the pressure of the lubricating oil, the oil penetrates into the oil seal edge and forms a very thin oil film between the rotating shaft. The oil film is subjected to the surface tension of the oil to form a “new moon” surface on the outer edge of the rotating shaft and the oil seal cutting edge to prevent oil from overflowing and to seal.oil-seal-working-principle-and-oil-seal-oil-leakage-measurements

II.Main factors causing oil seal leakage:

The tight seal of the oil seal is the main cause of oil leakage. When the shaft wears and forms a groove, even if the new oil seal is not sealed, the contact pressure of the oil seal lip and the shaft is lowered, and the interference between the diameter of the oil seal lip and the shaft diameter after installation is too small. The main reasons for analyzing the lack of sealing are:the-maintenance-steps-of-the-vacuum-unit

1.Oil seal manufacturing quality is poor;

2.Poor quality of shafts or bearings;

3.Improper use and maintenance;

4.Improper installation;

5.Improper storage, adversely affected by environmental pollution.