A variable speed pressure energy translating device including a plurality of axially extending pistons and associated cylinders and a yoke engaged by the pistons and pivoted on a transverse axis for varying the displacement thereof, and a housing having spaced saddle bearing seats. The yoke has spaced...http://www.google.de/patents/US4862789?utm_source=gb-gplus-sharePatent US4862789 - Positive displacement pump or motor utilizing a self-lubricated bearing
