Device for lubricating a rotary piston air pump

Abstract

A device for lubricating a rotary piston air pump driven by an engine penetrated by lubricating oil return conduits. The device includes a rotary housing including a casing and two side walls and rotatably mounted on a stationary axle having an eccentric thereon. The axle penetrates the housing perpendicular with respect to the side walls and receives on its eccentric a rotating piston, which is in camming engagement with the casing and limits volume changing operating chambers. The surface of the eccentric on which the piston is mounted is provided with a recess in communication with a suction conduit and a recess in communication with a discharge conduit. The piston has control openings for successively communicating the recesses with the operating chambers during rotary movement of the piston. An oil bore discharges on the surface of the eccentric on which the piston is mounted in a rotating direction of the piston about 15 degrees-30 degrees after the position with the least distance to the center of the axle and laterally offset with respect to the control openings of the piston, whereby the oil bore communicates with an oil conduit of the engine.

Dependencies are inferred from the claim text.