Patent ID: 6619243
Filing Date: 2003-09-16
Classification: F01B,F01C,F02B,Y02T

Abstract:
A pivoting piston rotary power device comprising a stator and a rotor, wherein the stator comprises:a tubular external stator portion defining an internal volume having an elliptical cross-section, the external stator portion comprising a tubular middle portion, a front end portion and a back end portion, the front end portion comprising a central throughhole, the tubular middle portion comprising at least one elliptical cam track disposed on an inner surface thereof; and an internal cylindrical stator portion projecting from the back end wall portion into the internal volume along an axis of the device, the internal stator portion having a plurality of passageways formed therein, each of the passageways comprising a channel parallel to the axis, each of the channels communicating with at least one respective radial port formed in a periphery of the internal stator; and wherein the rotor portion comprises: a shaft extending outwardly from a cylindrical block along the axis of the device, the shaft journaled within the central throughhole in the front end portion of the stator; the cylindrical block comprising a central cylindrical bore for receiving the internal stator, the block rotatable within that portion of the internal volume lying between the internal stator portion and the external stator portion, the block comprising at least one circular array of a selected number of working compartments equi-angularly spaced apart about the axis of the device, each working compartment defining a respective sector of a respective cylinder having a respective cylinder axis disposed parallel to the axis of the device, each compartment open to an outer surface of the block, each compartment further having a respective radially inwardly directed opening communicating with the central cylindrical bore; and a selected number of pivoting piston assemblies, each piston assembly received in a respective working compartment and having a respective pivot axis coinciding with the respective cylinder axis of the working compartment in which it is received, each piston assembly further comprising a roller cam follower for engaging the at least one elliptical cam track.