Patent ID: 8714951
Filing Date: 2014-05-06
Classification: F01C,F04C,Y10T

Abstract:
1. A method of manufacturing a high expansion ratio energy transfer device, the method comprising the steps of: (a) providing a housing comprising: (b) providing an outer rotor rotatable in the central portion bore, the outer rotor comprising a female gear profile formed in a radial portion defining a plurality of roots; (c) providing an inner rotor with a male gear profile defining a plurality of lobes in operative engagement with the outer rotor; and (d) forming a duct by maintaining a minimum radial distance between an outer rotor root and a corresponding inner rotor lobe, the duct comprising a radial height, a circumferential extent, and a depth to define a duct volume, wherein the duct radial height at a duct end face is substantially equivalent to the inlet passage radial height at a leading edge of the inlet passage.