Sealing means for radial faces of piston in orbital piston device

Abstract

Improved sealing means are provided for a motor, engine, or pump having a piston mounted for orbital motion within a cylinder housing, with the housing including radial faces and a plurality of combustion chambers. The improved sealing means are disposed in a groove in at least one of the radial faces of the piston to prevent leakage of working fluid in a circumferential direction between adjacent combustion chambers. The sealing means is comprised of an annular seal ring including an annular band, the band having a plurality of spaced extension members which define pockets therebetween. Each of the pockets has disposed therein a circumferential sealing member and spring means, with each of the spring means operating to bias the annular band into engagement with one of the radial faces of the cylinder housing to prevent leakage of working fluid in a radial direction. Each of the circumferential sealing members prevents working fluid from escaping from its corresponding pocket and leaking in a circumferential direction to an adjacent combustion chamber.

Dependencies are inferred from the claim text.