油圧機器におけるしゅう動部端部剛性と摩擦特性の関係(機械要素,潤滑,工作,生産管理など)

抄録

Effects of stiffness of sliding part end between piston and cylinder on the friction characteristics have been investigated experimentally for rotating-swash plate type piston pump and motor. The friction forces were measured by means of Piezo-type load washers under several stiffness of the sliding part end and forcing the piston to rotate. Since the oil whirl phenomena may occur on the piston for certain working conditions, the friction forces were evaluated during two rotations of the swash plate. The friction losses were estimated on the basis of the experimental results. It was clarified that the maximum friction forces and the mean friction losses decreased markedly with decreasing the stiffness, and that the maximum friction forces were almost independent of supply pressure, rotational speed of the swash plate and overhang ratio (bearing width) with low stiffness of the sliding part end.