Variable displacement pump

Details Variable displacement pump Variable displacement pump

1999-04-15

2000-09-19

Walberg, Teresa

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417559, 418 30, F04B 4900

Patent

active

061202568

ABSTRACT:
A variable displacement pump has a swingable, displaceable cam ring fitted to form a pump chamber together with the outer circumferential surface of a rotor having vanes. Notches are formed by notching to have a substantially V-letter shape in the starting end portions, in the rotating direction of the rotor, of a pump suction opening and pump discharge opening that open to the pump chamber. The notch formed in the starting end portion, in the rotor rotating direction, of the pump suction opening is constituted by a plurality of notched grooves aligned in the radial direction of the pump chamber and having different lengths in the rotating direction of the rotor. Hence, the timing at which the pump suction opening communicates with a pressure chamber formed between the vanes changes in accordance with swing and displacement of the cam ring.

REFERENCES:
patent: 5226802 (1993-07-01), Nakamura et al.
patent: 5518380 (1996-05-01), Fujii et al.
patent: 5562432 (1996-10-01), Semba et al.
patent: 5895209 (1999-04-01), Miyazawa
patent: 6042343 (2000-03-01), Semba et al.

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