Causes of oil leakage from bearing oil seals and maintenance methods

The effect of bearing oil seal leakage

Bearing oil seals are important parts on agricultural machinery and various types of machinery and equipment. Their performance and quality directly affect the reliability of the use of agricultural machinery and various mechanical equipment.

Some bearing oil seals have a long service life of one year, at least a few months or even three or five days. The oil leakage is discarded due to the tight seal. This situation has seriously affected the efficiency of agricultural machinery and various mechanical equipment, not only increasing fuel consumption and production costs, but also polluting the environment.

First, the working principle of the bearing oil seal

1. In the free state, the inner diameter of the oil seal lip is smaller than the shaft diameter, and it 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 produce a certain radial pressure on the rotating shaft.

3. When working, the oil seal lip will form a seal contact ring with a width of 0.25 to 0.5 mm under the effect of radial pressure. Under the effect of the pressure of the lubricating oil, the oil penetrates between the edge of the oil seal and the shaft to form a very thin oil film. The internal friction of the lubricant at the contact point and the stirring and pressing of the lubricant are caused by the surface tension of the oil, which forms a "crescent" surface on the outer edge of the shaft and the edge of the oil seal to prevent the oil from overflowing and acts as a seal .