Patent ID: 6655344
Filing Date: 2003-12-02
Classification: F02B,Y02T

Abstract:
A rotary gear device which comprises a housing, and at least one pair of rotatable, meshing gears positioned within said housing, said meshing gears defining spaced teeth which extend helically in the direction of the axis of each gear;a flow inlet and a flow outlet, each positioned in the housing to permit flow of fluid substantially longitudinally between the meshing gears as said gears rotate said teeth through a tooth meshing area, the teeth of said meshing gears defining first chambers which move substantially longitudinally while shrinking in size to substantially zero volume as they rotate toward a dead center plane, and further defining second chambers formed between said spaced teeth rotating away from said dead center plane and increasing in volume, at least one of said gears comprising a ring which defines the spaced teeth of said gear, said ring being positioned about the circumference of a rotatable disc, said rotatable disc being sized and positioned to firmly press against said ring and to position the gear teeth together with the gear teeth of the meshing gear in said tooth meshing area, but permitting a small amount of circumferential space at regions other than said tooth meshing area about the circumference between said disc and said ring.