Wear in the vanes and the cam ring of a vane pump.

Abstract

Wear tests of vanes and a cam ring in a vene pump are carried out under various operating conditions, using different types of pumps. The results may be summarized as follows : (i) The inner surface of a cam ring suffers from wear in the region where a contact force acts. (ii) The effects of the delivery pressure, the hydraulic fluids, the rotational speed, the eccentricity and the hardness of the cam ring, and the curvature of a vane tip on wear rate are clarified. (iii) Three types of wear appear in the present test; that is, mild wear, severe wear occuring after long sliding distance, and severe wear like adhensive wear or scoring. (iv) The wear rate cannot be simply estimated from the value of friction work consisting of factors of the delivery pressure, the rotational speed and so on. An occurrence of severe wear, however, can be predicted by the value of PHV where V means the sliding distance per unit time, and PH is a maximum of the Hertz normal pressure.