Tandem pump having a different sized vane for each pump

Details Tandem pump having a different sized vane for each pump Tandem pump having a different sized vane for each pump

1992-02-18

1993-05-25

Vrablik, John J.

Rotary expansible chamber devices

Grooved abutting cylinder-rotating member end surfaces

Groove communicates with vane slot

418133, 418212, 418268, F04C 2344, F04C 1100

Patent

active

052134911

ABSTRACT:
An improved tandem pump operates satisfactorily even at low temperatures. The pump has a pump housing, a first rotor, plural first vanes held by the first rotor, a second rotor, and plural second vanes held by the second rotor. A first cam ring, an intermediate side plate, and a second cam ring are disposed side by side to constitute first and second pump chambers in the housing. The side plate is split into plural parts. Oil delivered by rotation of the first rotor is forced into a pressure chamber formed between the plural parts of the intermediate side plate. The portion of the inner end surface of each first vane which receives pressure is made smaller in area than the portion of the inner end surface of each second vane which receives pressure.

REFERENCES:
patent: 2642802 (1953-06-01), Gardiner
patent: 4415319 (1983-11-01), Masuda et al.
patent: 4523897 (1985-06-01), Lower et al.
patent: 4971535 (1990-11-01), Okada et al .

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