Study On the Characteristics of Lip Seals for Gasoline

In the work reported here, the authors found that the lifetime over which lip seals can be expected to he reliable must be evaluated by taking into account the dependence of a sealing characteristic parameter on the wear of the shaft as well as the deterioration of the lip rubber. According to the theory, the sealing characteristics are closely related to the frictional torque. The authors, therefore, developed a test rig that made it possible to accurately measure the frictional torque and the amount of leaked gasoline. Simple tests then confirmed a clear correlationship between the amount of leaked gasoline and a characteristic value Φ which represents the frictional force. They also confirmed that there is a sealing/leakage limit value Φc. Then the effects of three parameters for sealing characteristics were estimated; (1) shaft diameter decrease due to wear, (2) shaft roughness decrease due to wear, and (3) the lip rubbers deterioration due to high temperature. Presented at the 55th Annual Meeting Nas...