Vane-type air motor

A vane-type compressed air motor, comprising:

• a casing with an air inlet and an air outlet;
• a rotor;
• a plurality of vanes, the plurality of vanes being inserted into the rotor to form a rotating body rotatable around a central axis and the rotating body being disposed inside the casing;
• vane stoppers respectively disposed on two axial sides of each of the plurality of vanes adjacent to a radially inner end of each of the plurality of vanes;
• an inner retainer ring disposed on an axial side of the rotor while being arranged eccentrically relative to the central axis of the rotating body, wherein an outer surface of the inner retainer ring pushes the vane stopper on a corresponding axial side of each of the plurality of vanes towards a direction away from the central axis of the rotating body;
• bearing blocks sleeved on the vane stoppers with inner grooves formed in the casing to receive the bearing blocks respectively at two axial sides of the rotor to restrict the movement of vane stoppers towards a direction away from the central axis of the rotating body;
• and
• a kit composed of two covers respectively disposed at two axial sides of the rotor, each of the two covers being provided with guide grooves on a side facing the rotating body and the plurality of vanes being movable within the guide grooves,
• wherein axially extending air grooves are formed on both side surfaces of each of the plurality of vanes adjacent to a radially outer end of each of the plurality of vanes, the side surfaces including an upstream side surface and a downstream side surface in the rotation direction of the rotating body.