Oil seal means of a rotary piston engine

摘要

An oil seal means of the rotary piston engine adapted to maintain oil and gas tightness between a side wall portion of a rotor and an inner wall of the side housing, wherein the oil seal ring to be mounted in an annular oil seal groove formed as cut at the side wall portion of the rotor has a L-shaped cross section and is formed into a unitary member having a substantially U-shaped cross section by being combined together with a rubber annular lip member having a L-shaped cross section and bonded to an annular flanged portion of the oil seal ring, said annular lip member being pressed onto a side wall portion of the annular oil seal groove at its free edge portion by a spring ring.