After a comprehensive analysis of the unit, the main reasons for oil seal leakage are summarized as follows:

 

1. Due to the relatively backward manufacturing conditions of the raw materials of the oil seal body, the casting parts need to be manually eliminated to prevent deformation. While the original factory in the treatment, the effect did not reach the expected, so that the oil seal in the high temperature and high speed environment after a period of time deformation, so that the end face and the main sealing surface of the host is not a good fit, there are leakage points between the sealing surface.

 

2. The oil seal is defective in the design. The oil seal used at that time is a half-and-half split structure. In the long-term operation, the original oil seal material produces hardening deformation, so that it can not fit well with the shaft surface, resulting in serious wear and tear of the half-and-half split position and the shaft, and the upper and lower part of the gap is too large, resulting in oil leakage.

 

3. The length of the oil seal spring is too long and the tension is not enough, which leads to the insufficient holding force of the oil seal. The upper and lower halves of the oil seal are separated in operation, resulting in the leakage point.