Muneo Mizumoto

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 Nashville, Tennessee May 7–11, 2000

Analysis of Radial Air-shear Force on Magnetic Disks for Reducing the Spin-off of Lubricants

To reduce the spin-off of lubricants on a magnetic disk, which is caused by the radial component of shear force between the disk and air, we analyzed the air-velocity distribution and the air-shear force by three-dimensional large-eddy simulation (LES). This sensitivity analysis, on five design parameters, showed that disk/arm clearance and ann thickness have a greater effect on the mean radial air-shear force than the other parameters. The force on a disk optimized according to the optimum parameters is 12% less than the force on a conventional disk.