A NUMERICAL-ANALYSIS OF THE NONSTEADY EHL PROCESS IN HIGH-SPEED ROTATING ENGINE CAM TAPPET PAIRS/

In this paper, by accounting for the effect of dynamic behavior in val ve train mechanisms on the surface contact load of a cam/tappet pair, a full numerical solution of nonsteady EHL for a high-speed diesel eng ine cam/tappet pair is obtained by a fast solution scheme. The shape o f the lubricant film and the characteristics of pressure distribution on cam/tappet pair surfaces are further studied. The lubrication proce ss of a cam/tappet pair at the opening and closing sides and in the mo st dangerous zone in normal working conditions is also analyzed This a nalysis provides the theoretical basis which best approximates practic al working conditions for designing cam profiles and establishing reas onable running-in condition.