Variable displacement vane pump

Details Variable displacement vane pump Variable displacement vane pump

1982-08-17

1984-03-27

Vrablik, John J.

Rotary expansible chamber devices

With changeable working chamber magnitude

Axially or radially spaced working chambers

418219, F04C 200, F04C 1504

Patent

active

044391170

ABSTRACT:
A variable displacement vane pump has a ported casing (10), a rotor (28) and a first (32a) and second (32b) plurality of vanes. The ported casing (10) has a pair of relatively rotatable, complementary cams (18, 20). Each cam has a surface shaped to provide a curvilinear annular track (18a, 20a). The rotor (28) is rotatably mounted in the casing (10). The vanes (32a, 32b) are slidably mounted upon the rotor (28). Each of the vanes (32a, 32b) are sized and positioned to engage a corresponding one of the pair of cams (18, 20). The vanes of the first plurality (32a) of vanes engage one of the cams (18), the other cam (20) being engaged by the vanes of the second pluarlity (32b). Thus constructed, the vanes (32a, 32b) can move in pairs in a closed path within the casing (10). The vanes (32 a, 32b) of each pair can ride on different ones of the cams (18, 20). By rotating the cams (18, 20) with respect to each other, the phasing of the vanes (32a, 32b) in each pair can be altered. This phasing change varies the displacement of the pump.

REFERENCES:
patent: 2570411 (1951-10-01), Vickers
patent: 2790391 (1957-03-01), Holl

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