The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2017
Filed:
Apr. 04, 2014
Magna Powertrain Inc., Concord, CA;
Matthew Williamson, Richmond Hill, CA;
Manmohan Sehmby, Brampton, CA;
Cezar Tanasuca, Richmond Hill, CA;
Karthikeyan Ganesan, North York, CA;
MAGNA POWERTRAIN INC, Ontario, CA;
Abstract
A variable capacity vane pump () is provided having a pump control ring () that is moveable to alter the capacity of the pump (). A control chamber () is formed between the pump casing () and the control ring (). The control chamber () is operable to receive pressurized fluid to create a force to move the control ring () to reduce the volumetric capacity of the pump (). A primary return spring () acts between the control ring () and the casing () to bias the control ring () towards a position of maximum volumetric capacity. A shaft is coupled at one end to the control ring and a second end of the shaft is positioned a predetermined distance from the casing (). A secondary return spring () is mounted about the shaft and is configured to engage the control ring () after the control ring () has moved a predetermined amount. The secondary return spring () biases the control ring () towards a position of maximum volumetric capacity. The secondary return spring () acts against the force of the control chamber () to establish a second equilibrium pressure.