Pneumatic motor improvements and pneumatic tools incorporating same

摘要

A pneumatic motor (43) having a motor chamber (33) having an inner surface with an eccentric longitudinal axis, a motive gas fluid inlet (61,67), and at least one end wall (70) located transversely to the longitudinal axis with an exhaust aperture (77) located therethrough. A rotor (42) is rotatably disposed in the motor chamber (33) on the eccentric longitudinal axis and having a plurality of radial slots (44), the rotor (42) defining a first rotational position with respect to the longitudinal axis at which the distance between the rotor (42) and the motor chamber (33) is a minimum. A plurality of vanes (45) is slidably carried within the plurality of radial slots (44) and rotationally moving between the fluid inlet (62,63) and the exhaust aperture (77) during rotation of the rotor (42). The exhaust aperture (77) is located at a second rotational position with respect to the longitudinal axis such that during rotation of the rotor (42), the angular distance traveled by each of the plurality of vanes (45) between the first rotational position and the second rotational position in a first rotational direction is greater than 180 degrees.