Abstract
Visualization study of the behavior of lubricating oil film between rotating wet clutch disks used in automatic transmissions, taking account of the porous facing of one disk, was conducted by a high speed video camera when the plates were engaging. Pressure on porous surface of the plate, friction torque acted between disks, and rotating speed of the reaction plate were measured simultaneously with the visual recording. It was found that air bubbles became visible on surface of porous plate during the boundary lubrication stage. The variation of surface pressure had a strongly effect on the behavior of air bubbles.
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