Variable displacement vane pump with regulated vane loading

Details Variable displacement vane pump with regulated vane loading Variable displacement vane pump with regulated vane loading

1995-07-12

1998-03-31

Vrablik, John J.

Rotary expansible chamber devices

With changeable working chamber magnitude

By cylinder or cylinder portion pivotal movement

418268, F04C 2344

Patent

active

057331090

ABSTRACT:
A novel single acting variable displacement vane pump (VDVP) incorporating novel vanes and undervane venting which produce selective regulated pressure-loading of the vanes against the cam surface and more positive tracking in the incoming seal arc and the outgoing or discharge seal arc of the pump rather than uniform pressure balancing of the vanes throughout the 360.degree. cam chamber. The vanes incorporated into the present pumps preferably are sectional two-piece vane assemblies comprising an upper vane section which slidably supports a lower vane section and incorporates a fluid pressurizable cavity between said vane sections which, when pressurized, forces the vane sections in opposite radial directions, and which enables the vane sections to come together and integrate when the cavity is depressurized. The vane cavity is open to the fluid pressure on one side of the vanes while the undervane area of the vane slots, below the vanes, is open to the fluid pressure one the opposite side of the vanes. Thus, in the inlet seal arc area of the pump the vane cavity becomes pressurized to force the vane sections apart and force the upper vane section against the cam surface, and in the outlet or discharge seal arc area of the pump the vane cavity becomes depressurized and the undervane area of each vane slot becomes pressurized, to force the vane sections together and force the upper vane section against the cam surface.

REFERENCES:
patent: 2545238 (1951-03-01), MacMillin et al.
patent: 3102494 (1963-09-01), Adams
patent: 3407742 (1968-10-01), Mitchell et al.
patent: 3451346 (1969-06-01), Pettibone
patent: 4354809 (1982-10-01), Sundberg

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