Controllable vane pump

Details Controllable vane pump Controllable vane pump

1997-07-08

1998-05-19

Vrablik, John J.

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

418 27, 418 30, F04C 2344, F04C 1504

Patent

active

057528152

ABSTRACT:
In a controllable vane pump for pumping lubricant through a lubricant circulating system of an internal combustion engine wherein a pivotally supported control ring surrounds the vanes which rotate with the pump rotor and engage the inner walls of the control ring to form therewith pump spaces for pumping an amount of fluid which depends on the pivot position of the control ring and means are provided for biasing the control ring with a certain force toward a pivot position for greatest pump volume, the control ring defines with the housing an inlet pressure chamber which is maintained at the pressure of the lubricant at the pump inlet and a discharge pressure chamber which is maintained at the pump discharge pressure whereby the differential force generated by the pressures in said inlet and discharge pressure chambers is balanced by the force applied to the control ring by the control ring biasing means.

REFERENCES:
patent: 4437819 (1984-03-01), Merz
patent: 4538974 (1985-09-01), Stich et al.

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