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:
Nov. 20, 2007
Filed:
Oct. 31, 2003
Johannes Quehenberger, Saalbach, AT;
Franz Gratzer, Stallhofen, AT;
Dieter Schmidl, Graz, AT;
Magna Drivetrain AG & Co KG, Lannach, AT;
Abstract
An actuator with a simple function for the control of a friction clutch in the drive train of a motor vehicle having a cylinder/piston unit for generating the contact pressure of the clutch should be fast, inherently safe and nevertheless simple and inexpensive. For this purpose, a controllable pump () generates a pressure medium and makes it available to the cylinder/piston unit () via a self-regulating valve unit (). A dump valve () consists of a sleeve () and a spring-assisted slide () therein. The sleeve has a first opening (), through which the pressure medium can flow from the cylinder/piston unit (). The slide () exposes the opening () in a first position and conceals the opening of a second position. The clutch is controlled in this way by actuating the electric motor.