A multi-cylinder pump for delivering fluids under high pressure which includes a multi-lobed camshaft having bearing supported yoke elements disposed in an oil-filled crankcase for coupling the camshaft to plural piston elements such that displacement of the plural piston elements occur in a desired...http://www.google.com/patents/US4184817?utm_source=gb-gplus-sharePatent US4184817 - High pressure multi-cylinder pump
