Gear pump having a bleed slot configuration

Details Gear pump having a bleed slot configuration Gear pump having a bleed slot configuration

1998-03-09

2000-03-07

Vrablik, John J.

Rotary expansible chamber devices

Apertured bypass to pressurize or relieve working chamber...

4182064, F04C 218

Patent

active

060331976

ABSTRACT:
A method and apparatus is provided for producing a gear pump/motor in a low cost and efficient manner that can effectively operate in air entrained oil without emitting undesirable noises. This is accomplished by providing bleed slots in a housing adjacent an outlet passage at a location that allows first and second intersecting cavities to be machined with the same boring tool. The bleed slots have a length defined by the distance between two adjacent teeth of first and second intermeshing gears and a cross-sectional area at the mid-point of the arcuate length that is defined by multiplying the flow of the pump at a given RPM time a derived constant. The machining of the body of the gear pump/motor is accomplished in a low cost and efficient manner to produce a gear pump/motor that operates in air entrained oil without emitting undesirable noises.

REFERENCES:
patent: 2870720 (1959-01-01), Lorenz
patent: 3474736 (1969-10-01), Lauck
patent: 4355964 (1982-10-01), Rodibaugh et al.

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