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. 03, 2004
Filed:
Apr. 10, 2002
Franz Gratzer, Stallhofen, AT;
Abstract
A speed-difference-dependent hydraulic clutch comprises a drive housing ( ), which rotates in a housing ( ) that is fixed in space and forms a reservoir, a hydrostatic displacement machine ( ), an output shaft ( ), a friction clutch ( ) and a piston ( ) for acting on the friction clutch ( ), a pressure being produced in a pressure chamber ( ) when a difference occurs between the speed of the drive housing ( ) and that of the output shaft ( ), this pressure giving rise to action upon the friction clutch ( ). To achieve rapid control and adaption of the characteristic, the first and the second opening ( ) are each connected to the reservoir ( ), via a first and second rotary input ( ) and a first and second controllable valve ( ) respectively, said valves being fixed to the housing, the first and second control valve ( ) being designed as controllable throttles, with the result that a control action takes place both at the respective supply side and at the discharge side of the displacement machine, irrespective of the direction of the differential speed.