Rotary hydraulic machine having a valve responsive to rotor bore

Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Three or more cylinders arranged in parallel – radial or...

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F01B 300, F01B 1304

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active

040489035

ABSTRACT:
A rotary hydraulic pump or motor has a piston-carrying rotor having a face engaging a port plate which includes a high pressure port. A number of by-pass passages enable the rotor bores to communicate with the high pressure port before being in full alignment therewith. A valve arrangement is responsive to the pressures in the high pressure port and in successive ones of the rotor bores to provide that variation of these pressures causes variation of the position, relative to top-dead-center, at which successive rotor bores communicate with the high pressure port via the by-pass passages. The arrangement is such that pressures in the rotor bores and the high pressure port, immediately before they communicate, are maintained substantially equal over a range of pressures.

REFERENCES:
patent: 2288768 (1942-07-01), Zimmermann
patent: 2781775 (1957-02-01), Merrill
patent: 2963983 (1960-12-01), Wiggermann
patent: 3200761 (1965-08-01), Firth et al.
patent: 3905274 (1975-09-01), Week et al.
patent: 3956969 (1976-05-01), Hein

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