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:
Feb. 02, 2010
Filed:
Jul. 14, 2006
Robert O. Burkhart, Novi, MI (US);
Gregory M. Pietron, Canton, MI (US);
Yuji Fujii, Ann Arbor, MI (US);
Ted D. Snyder, Brighton, MI (US);
William E. Tobler, Willis, MI (US);
Robert O. Burkhart, Novi, MI (US);
Gregory M. Pietron, Canton, MI (US);
Yuji Fujii, Ann Arbor, MI (US);
Ted D. Snyder, Brighton, MI (US);
William E. Tobler, Willis, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
An actuator system includes a piezoelectric pump; an accumulator including a cylinder, a piston located in the cylinder, a port located at a first side of the piston and hydraulically connected to the pump outlet and a switching circuit, a relief port hydraulically connected to the reservoir and located at a second side of the piston, and a spring biasing the piston toward the port; and a hydraulically actuated servo including a front port hydraulically connected to the switching circuit, a back port hydraulically connected to the reservoir, and the servo causing the friction element alternately to engage and to disengage in response to a magnitude of hydraulic pressure in the servo.