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Reducing the torque of the crankshaft seal of a light vehicle engine is required to improve fuel efficiency. A sprung radial fluoro rubber lip is one of the representative seal types for this application, although axial-silicone-rubber-type lip seals are widely used in diesel engines of buses and trucks. This type of oil seal has low torque because the primary lip load is low. In terms of reliability, it is durable against contamination between the lip and slinger while the shaft is rotating; thus, it has a long life span [1]. This axial-type lip seal was applied to the gasoline engine of a light vehicle to achieve low friction and high reliability. A slight oil leak was observed for the conventional slinger at high shaft speed. To resolve this issue, a new slinger that can prevent leakage has been developed. To clarify the phenomenon, direct observations of the leakage and evaluation of lip followability were conducted.

Unexpected noise may occur around air intake manifold when the throttle valve is quickly opened. In order to solve this problem, mesh is often mounted into the air flow between the intake manifold and the throttle body. In this study the effect of mesh design on the noise reduction was investigated. Several designs of the mesh were tested with an actual automobile and the developed test equipment taking advantage of an intake manifold unit, and the noise attenuation was discussed with measuring the noise and observation of the mesh deformation. Based on those experiments, the mesh design for noise reduction was optimized. Furthermore integration of mesh and rubber gasket was examined. Finally, rubber mesh-gaskets which provide sealing and noise attenuation for air intake has been proposed in this study.