ROCKER VANE TYPE PUMP ACTUATOR ADDRESSED TO FRETTING CORROSION

PROBLEM TO BE SOLVED: To promptly solve the problem of clearing away the phenomenon of abnormal wear in light of attempting to bring a highly efficient pendulum type wave power generation system into an early practical use, as is encouraged by the occurrence of an adhesive wear phenomenon through fretting corrosion with respect to a high strength soldered interfaces between pressure-receiving components having their high-rigidity direction and low-rigidity direction being mutually reversed, when a test for operation over an extended period has been performed on a rocker vane type pump actuator for use as a high-power rocker pump in an attempt to make it usable at a high pressure of 25 MPa.SOLUTION: A cylindrically shaped part 1c-c is provided in a side cover 1c in such a way as for it to bulge into a cylinder side, in regard to joint surfaces between a cylinder 3c whose strength is low in the radiation direction with respect to a center shaft, and the side covers 1c, 2c whose strength is high in the radiation direction, so that, when a high pressure hydraulic fluid causes the cylinder cross section to be deformed into a nearly elliptical shape, the side cover side is also made into a similar cylindrical shape so as for it to have like distortion generated. In addition, an oil path, with which a low-pressure side working chamber is always in communication, is installed on the contact surfaces with side covers 1c, 2c of a fixed vane 9c-b fixed to the cylinder.