Variable displacement pump with communication passage

Details Variable displacement pump with communication passage Variable displacement pump with communication passage

2008-01-15

2008-01-15

Denion, Thomas (Department: 3748)

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

Reexamination Certificate

active

10889126

ABSTRACT:
A variable displacement pump includes a rear cover and side plate arranged on both sides of a cam ring and making slide contact with the cam ring. The rear cover has an end face on the side of the cam ring, which is formed with a suction port. A seal member is arranged in a chamber formed between a pump housing and the cam ring and for dividing the chamber into two portions that define first and second working chambers. A connection groove and terminal groove are formed in the end face of the rear cover to provide fluid communication between the suction port and the second working chamber.

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patent: 102 40 409 (2003-03-01), None
patent: 2003-74479 (2003-03-01), None
patent: 10-201995 (1999-06-01), None
U.S. Appl. No. 10/890,243, filed Jul. 14, 2004, Uchino et al.

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