PUMP OR MOTOR

摘要

A positive displacement device, which can serve as a pump or motor, has a rotor (14) and at least one stator (22). The stator and rotor have opposing, undulating surfaces (16 and 23) presenting alternating lobes (18) and valleys (20) which cooperate with one another to form variable volume chambers when the rotor and stators move relative to one another in a first direction and reciprocate relative to one another in a second direction which is transverse to the first direction. The rotor may rotate relative to the stator and reciprocate relative to the stator in a direction transverse to the direction of rotation. The rotor can be splined to a shaft (10) so as to be rotated by, or rotate, the shaft while reciprocating back and forth on the shaft.