Patent ID: 7051698
Filing Date: 2006-05-30
Classification: F01C

Abstract:
1. A rotary drive mechanism for use as a compressor or pump, the mechanism including: a housing having a chamber therein defined generally by a peripheral wall, the peripheral wall having a first part that is substantially semi-elliptical and defined by a first ellipse bisected along its longitudinal axis, and a second part having a geometry defined by plotting the locus of a first end of a straight line equal in length to the length of the first ellipse as a second end of the straight line moves along the first ellipse, and wherein the straight line passes through the center point of the longitudinal axis of the first ellipse; a rotor rotatably mounted in the chamber about an axis of rotation and for sliding movement relative to the axis in a direction generally perpendicular thereto, wherein the axis is offset from the center of the chamber by up to about one sixth the height of the chamber, the rotor having two longitudinal seal edges for forming seals with the peripheral wall, a cross-sectional area of at least about 30% of the cross-sectional area of the chamber, and a profile that is complementary to the first part of the chamber.