|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||418/026; 418/024; 418/025; 418/027; 418/031|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 12 인용 특허 : 10|
The present invention relates to a system that provides independently operated or controlled circuits in a single device. An exemplary application adapts a variable displacement roller pump into an engine geometry control system that uses one circuit of the pump during start-up and then removes the circuit from the system and satisfies other pumping needs with the other circuit of the pump.
1. A balanced variable displacement roller pump system comprising:a housing having a rotor received therein for rotation about an axis; first and second cam rings received in the housing, the cam rings being independently and selectively movable toward and away from the rotor to define first and second independently variable pumping sections; a control assembly operatively associated with the cam rings for selectively altering positions of the first and second cam rings; and a biasing member urging the cam rings away from the rotor.