Hydraulic fluid pressure device and porting arrangement therefor

Rotary expansible chamber devices – Moving cylinder – Rotating

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F04C 1502, F04C 106

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active

039959783

ABSTRACT:
A fluid pressure device such as a hydraulic pump is provided having an improved inlet porting arrangement to permit a greater output flow rate for a given input speed. The pump is of the type including a housing defining an inlet chamber and an outlet chamber and inner and outer rotors having spaced apart axes of rotation defining a line of eccentricity. The teeth of the rotors interengage to define a plurality of expanding and contracting volume chambers. The housing includes an end face adjacent the rotors at which the inlet chamber defines an inlet port communicating with the expanding volume chambers. The inlet port is generally arcuate and extends circumferentially from approximately the line of eccentricity on one side of the device to the line of eccentricity on the opposite side of the device. Preferably, the inlet port includes a pair of terminal portions of reduced radial width to prevent cross-porting between the inlet port and the outlet port when one of the teeth of the outer rotor is circumferentially aligned with the terminal portion.

REFERENCES:
patent: 2373368 (1945-04-01), Witchger
patent: 2739538 (1956-03-01), Witchger
patent: 2872872 (1959-02-01), Quintilian
patent: 2968251 (1961-01-01), Eames, Jr. et al.
patent: 3129875 (1964-04-01), Cirillo
patent: 3551079 (1970-12-01), Brundage
patent: 3695791 (1972-10-01), Brundage

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