Importance

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Abstract

A rotary positive-displacement fluid-pressure motor which includes a casing, having an inlet port and an outlet port, at least two intermeshing rotors of toothed or lobed form housed for rotation in the casing, and means for conducting pressure fluid derived from the inlet port as far as a predetermined position in a face adjacent, and engaged by, a side of one of the rotors. A recess is so disposed in that face intermediate the predetermined position and the outlet port that, for facilitating starting of the motor when fluid under high pressure is directed into the inlet port, some of that fluid can gain access to the recess by way of said means and whichever intertooth or interlobe space of that rotor is so positioned as to place the means and the recess in communication.

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First Claim