Linear oil seal means principally intended to obtain an oil scraping effect

In a rotary piston engine including a polygonal rotor containing side walls and having a plurality of apex portions with a corner seal being provided at each apex portion, at least one annular oil seal means and side seal means, said annular oil seal means comprising an annular oil seal groove disposed in the side wall portion of the rotor, said oil seal groove containing an annular oil seal ring resiliently supported by a spring means, said annular oil seal ring housing an annular elastic means which intercepts an annular space left between said annular oil seal ring and said annular oil seal groove, said side seal means comprising a linear groove disposed in the side wall portion of said rotor and extending between two adjacent corner seals provided at respective apex portions of said linear groove containing a linear sealing element resiliently supported by a spring means, the improvement which comprises providing a linear oil seal means which extends between said annular oil seal means and said side seal means, said linear oil seal means comprising a linear groove disposed in the side wall portion of said rotor, said linear groove containing a linear sealing element resiliently supported by a spring means, said linear oil means joining said side seal means in a region located on one side of a line which connects a particular corner seal with the central axis of the rotor, said linear oil seal means joining the annular oil seal means in a region located on the other side of said line said one side preceding the corner seal, as seen in the direction of rotation of the rotor.