Variable displacement pump

Details Variable displacement pump Variable displacement pump

2008-07-15

2008-07-15

Kramer, Devon (Department: 3746)

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

C417S219000

Reexamination Certificate

active

10890243

ABSTRACT:
A variable displacement pump includes a control valve formed with a high-pressure chamber for introducing therein high-pressure fluid on the upstream side of a metering orifice, a pressure chamber for introducing therein pressure fluid on the downstream side of the metering orifice, a low-pressure chamber arranged between the high-pressure and pressure chambers for introducing therein low-pressure fluid, and a communication passage for providing fluid communication between one of the high-pressure and low-pressure chambers and a first fluid-pressure chamber of the pump. First and second recessed grooves are formed in the outer-peripheral surface of a spool of the control valve to provide fluid communication between the low-pressure and high-pressure chambers through the communication passage of the control valve when the spool carries out selective switching between the high-pressure and low-pressure chambers to supply fluid to the communication passage, thus restraining abrupt pressure rise in the first fluid-pressure chamber.

REFERENCES:
patent: 5538400 (1996-07-01), Konishi et al.
patent: 5895209 (1999-04-01), Miyazawa
patent: 6155797 (2000-12-01), Kazuyoshi
patent: 6217296 (2001-04-01), Miyazawa et al.
patent: 6524076 (2003-02-01), Konishi
patent: 6619928 (2003-09-01), Konishi
patent: 6736604 (2004-05-01), Okada
patent: 6976830 (2005-12-01), Uchino
patent: 2001/0036412 (2001-11-01), Konishi
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patent: 09-273487 (1997-10-01), None
patent: 2000-087877 (2000-03-01), None
patent: 2003-074479 (2003-03-01), None
patent: 0201995 (1999-06-01), None
U.S. Appl. No. 10/889,126, filed Jul. 13, 2004, Uchino et al.

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