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:
Jun. 10, 2003
Filed:
Jul. 03, 2002
William Glenn Spadafora, Clarkston, MI (US);
Dana Corporation, Toledo, OH (US);
Abstract
An electro-hydraulic actuator system ( or ) includes a hydraulic actuator ( ) having a pair of fluid filled chambers ( ) and being operable to provide an actuator output ( ) as a function of fluid pressures at the chambers. An electric-hydrostatic actuator ( or ) includes an electric motor ( or ) responsive to motor control signals for providing an output to a motor shaft ( or ), one or more pistons ( or ) coupled to the shaft, and one or more hydraulic housings ( or ) mounted on the motor and cooperating with the pistons for providing a pair of fluid cylinders ( or ) respectively coupled to the fluid chambers at the hydraulic actuator. A solenoid valve ( ) is connected between the cylinders, and is responsive to valve control signals for feeding fluid between the actuator chambers and thereby short circuiting the hydrostatic actuator cylinders. A pair of pressure sensors ( ) are coupled to the actuator chambers for providing respective pressure signals as a function of fluid pressure at the chambers, and a controller ( or ) is responsive to the pressure signals for providing the valve and motor control signals.