The oil seal seal working principle is as follows: the simplest shaft end seal is the oil seal seal, in the free state of the oil seal diameter is smaller than the shaft diameter, that is, there is a certain amount of interference.
After the oil seal is installed on the shaft, the pressure of the knife edge and the contraction force of the self-tightening spring of the spring produce a certain holding force on the sealing shaft to block the leakage gap and achieve the purpose of sealing.
Oil seal is divided into skeleton and no skeleton, spring and no spring, oil seal installation position is small, axial size is small, make the machine compact, good sealing performance, long service life.
Easy to disassemble, easy to repair, cheap but can not withstand high pressure.