Patent ID: 6886527

Claim:
A rotary type motor comprising a first rotary member having a pair of leading vanes and a second rotary member having a pair of trailing vanes with each rotary member having a common central rotation axis, each leading vane having an associated and trailing vane which define therebetween a working chamber such that two opposed working chambers are defined on opposite sides of said common central rotation axis, said vanes rotating within a cylindrical chamber and during each revolution each leading vane and associated trailing vane complete an intake stage, a compression stage, a power stage, and an exhaust stage of a combustion cycle; said cylindrical chamber including an exhaust port and an intake port, said vanes each including a drive shaft with said drive shafts being interconnected by gear train, said gear train including a pair of second order elliptical gears which determine the relative movement of said trailing vanes towards and away from said leading vanes as said vanes rotate about said common central rotation axis and define said stages of said combustion cycle; said gear train further including an adjustment mechanism for varying the position of said trailing vanes relative to said leading vanes at any point in said combustion cycle to thereby vary the compression ratio, and wherein said adjustment mechanism for varying the relative position of said trailing vanes is a planetary gear system with a movable outer ring gear, a central sun gear and a pair of planetary gears, whereby movement of said ring gear varies the position of said trailing vanes relative to said leading vanes and depending upon the direction of rotation of said ring gear the compression ratio is increased or decreased.