Patent ID: 6945218
Filing Date: 2005-09-20
Classification: F01C,F04C

Abstract:
1. A rotary piston device comprising: a shaft to rotate about a longitudinal axis; a rotor centrally secured to the shaft, the rotor having a body with a cylindrical surface extending between spaced ends; a rotor disk secured at each end of the rotor and secured at a centre of the rotor disk to the shaft; a housing encasing the shaft, the rotor and the rotor disks within an internal cavity, the shaft extending outside of the housing, the housing having interior end walls adjacent to the rotor disks and an interior sidewall, with fluid inlet and fluid outlet ports in the interior sidewall, a first portion of the interior sidewall of the housing being cylindrical and curved with a constant radius over an angle of about approximately 180°, the first portion being spaced a constant distance from confronting portions of the cylindrical surface of the rotor, and a second portion of the interior sidewall of the housing extending between the extremities of the first portion of the interior sidewall, and a curvature of the second portion having a greater radius than a curvature of the first portion; the cylindrical surface of the rotor being proximal to the interior sidewall of the housing at a point between the fluid inlet and fluid outlet ports about midway along the second portion, the fluid inlet and fluid outlet ports being located in this second portion of the interior sidewall of the housing; at least three equally spaced, radially oriented slots in the rotor longitudinally extending across the cylindrical surface of the rotor body; at least three similar vanes, each vane having internal and external edges extending between sides, each vane slidably seated in one of said slots, each vane movable radially in the corresponding slot between an extended position with the external edge of the vane adjacent the interior sidewall of the housing, and a retracted position wherein the external edge of the vane does not extend beyond the cylindrical surface of the rotor, the vanes being spaced from adjacent vanes about the rotor such that there is always at least one vane positioned between the fluid inlet and fluid outlet ports; an ear extending beyond the external edge of each vane at each of the vane sides and a pin secured to each ear and extending inwardly towards the vane's other ear, the pin of each ear seated in one of a pair of races continuously extending in portions of the interior sidewall of the housing, the races circumscribing the shaft and formed so as to provide proper extending and retracting movement of the vanes as the pins move along the races as the rotor rotates; and a plurality of slots in the rotor disks aligned with the rotor slots and slidably receiving the sides of the vanes and the corresponding ears, the rotor disks, the housing and the vanes constructed so that, during operation of the rotary piston, fluid entering the housing through the inlet port is carried by the rotor, in each of compartments formed between adjacent vanes, the rotor surface between the vanes, the rotor disks and the corresponding portions of the end walls and interior sidewall of the housing, until the adjacent vanes encompass the outlet port whereby the fluid is allowed to leave the housing.