Air motor with offset front and rear exhausts

摘要

A rotary air motor has a liner disposed within a tool housing and having a cylindrical bore therethrough. A rotor having radially slidable vanes is eccentrically rotatably mounted in the bore by bearings in the plates of the liner, the vanes cooperating with the rotor and the liner to define a plurality of rotating variable volume fluid compartments. A fluid inlet port in one end plate communicates sequentially with the fluid compartments. First and second exhaust ports respectively formed in the end plates also communicate sequentially with the fluid compartments, but the two exhaust ports are angularly offset from each other so that the fluid compartments communicate first with the exhaust port remote from the entry end plate and then with the exhaust port at the entry end plate. The exhaust passage from the remote exhaust port passes along the outside of the liner back to the entry end plate, thereby ensuring cooling of both ends of the motor.