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:
Jan. 25, 2000
Filed:
Jan. 24, 1997
Theodor Gassmann, Siegburg, DE;
GKN Viscodrine GmbH, , DE;
Abstract
A device for transmitting torque between two parts rotatably mounted relative to one another. The device comprises a friction coupling 12 having friction elements rotationally fixed to each of the parts. The friction elements are rotatably relative to one another. The friction coupling 12 is loadable by at least two movable pistons 19.sub.1, 19.sub.2, which delimit a pressure chamber 21 on one side. The pressure chamber 21 is filled with a viscous fluid, and is connected to a reservoir 26. The pressure chamber 21 is formed by a rotational housing 20 and the pistons 19.sub.1, 19.sub.2. The rotational housing 20 is connected with one of the rotatable parts. A rotational member 22 rotates inside the chamber 21 and is connected to the other rotatable part. A control member 23 is positioned in a pressure chamber 21 and faces of the rotational member and counter faces of the control member and constitute at least one shear channel 38 which communicates with the reservoir 26 and the pressure chamber 21. The pressure chamber 21 is delimited by said at least two separate, axially movable annular pistons, 19.sub.1, 19.sub.2. Based on different characteristic functions, the pistons 19.sub.1, 19.sub.2 convert pressure in the pressure chamber 21 to an axial force acting on the friction coupling 12 .