Patent ID: 7264452
Filing Date: 2007-09-04
Classification: F01C

Abstract:
1. A rotary machine comprising: a housing with spaced apart forward and rearward end walls and an interior wall defining a chamber; a multi-lobe rotor in said chamber having curved faces meeting at apices, said apices being symmetrically arranged about a rotor axis, said apices positioned in close proximity to the interior wall of said housing, said rotor having parallel forward and rearward end faces extending between said curved faces, each of said parallel end faces facing one of said end walls, said parallel end faces being perpendicular to said rotor axis; a crank with a center shaft extending along a shaft center axis offset from said rotor axis by a crank length distance, said center shaft extending through said chamber and rotatably mounted in the forward end wall, said crank including an eccentric shaft engaging at least one eccentric bearing supported by said rotor for forming driving contact between said center shaft and said rotor, said eccentric shaft and said eccentric bearing aligned with the rotor axis; a stationary gear having a pitch radius and extending into the chamber from said forward end wall, said stationary gear rigidly mounted in said forward end wall, inline with the shaft center axis, said center shaft rotatably mounted in said forward end wall, inline with the shaft center axis, said center shaft passing through said stationary gear; a crank web connecting said center shaft to the eccentric shaft, said crank web connected to said center shaft rearward of said stationary gear; a rotor gear mounted to said rotor, inline with said rotor axis, said eccentric shaft passing through said rotor gear, and being connected to the crank web forward of said rotor gear, with said eccentric shaft directly accessible from the rearward side of said rotor; the rotor gear having a rotor gear pitch radius greater than said stationary gear pitch radius by a ratio of the number of lobes of said rotor divided by the number of lobes of said rotor minus one; a reversing gear having a pitch radius rotatably mounted on a reversing shaft, said reversing shaft rigidly mounted to the crank web, said reversing gear having a gear center axis offset from said center axis by a distance equal to said stationary gear pitch radius plus said reversing gear pitch radius; said reversing gear having a gear center axis offset from said rotor axis by a distance equal to said rotor gear pitch radius plus said reversing gear pitch radius; and said reversing gear engaging said rotor gear and said stationary gear.