AIR MOTOR

PROBLEM TO BE SOLVED: To provide an air motor having a small torque fluctuation, and capable of providing a large torque. SOLUTION: A rotor 12 is formed by connecting in the axial direction a first rotor member 22 and a second rotor member 23 coaxially disposed. Between the first rotor member 22 and the second rotor member 23, an angular phase, which is only a 1/2 angular phase of the axis made by a pair of vanes 27 adjacent to each other in the peripheral direction of the rotor 12, is provided around an axial line of the rotor 12, and the vanes 27 are alternately arranged in a front view. Therefore, between the first rotor member 22 and the second rotor member 23, timing for supplying compressed air to air chambers located symmetrically to the axial line is shifted, and the overlap supply time of compressed air to these air chambers is shortened, which makes the rotation of the rotor 12 smoother. Thus, the air motor 7 having the small torque fluctuation and the large torque can be obtained. COPYRIGHT: (C)2004,JPO