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. 16, 2010
Filed:
May. 26, 2006
Friction clutch having a hydraulic actuator, and drive unit having at least one such friction clutch
Johannes Quehenberger, Saalbach, AT;
Dieter Schmidl, Graz, AT;
Johannes Quehenberger, Saalbach, AT;
Dieter Schmidl, Graz, AT;
MAGNA Powertrain AG & Co KG, Lannach, AT;
Abstract
The invention relates to a friction clutch having a single-acting actuator which is a piston-cylinder unit and is connected in a controllable fashion to a pressurized fluid source. In order to be able to carry out a fast pilot stroke up to the point at which the clutch makes contact, the piston-cylinder unit has a stepped piston whose first step of small diameter delimits, by means of its cylinder, a first pressure space, and whose second step of relatively large diameter delimits, by means of its cylinder, a second pressure space, a pressure line being connected to the first pressure space and, by means of a first non-return valve which opens at a certain pressure, to the second pressure space, and it also being possible for the second pressure space to be connected via a discharge line and a suction line, which contains a second non-return valve, to the fluid reservoir. The invention also relates to a drive device having clutches of said type.