Abstract
In order to clarify the behavior of oil film between a piston ring and cylinder liner, pressure measurement and visualization of oil film are carried out simultaneously using a simulation rig. In this rig, the piston ring is simulated by a straight glass bar test piece and the cylinder by a reciprocating flat plate. The following observations were obtained. The oil film pressure of the full film region before oil film rupture is negative and the maximum magnitude of negative pressure, i.e., tension, reaches to 0. 35 MPa. Cavities are formed at 20°-30° crank angle from dead center in the full film region, and grow with the increase of the crank angle. Then a new series of cavities is formed at the rear edge of the test piece. The two series of cavities then coalesce and the flow becomes perturbed momentarily. Negative pressure is detected at a 20°-30° crank angle after dead center and is not released until this coalescence of cavities has occurred.
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Schedule a callMore From: JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing
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