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:
Oct. 20, 1987
Filed:
Apr. 18, 1986
Udo Hickmann, Muehlacker, DE;
Guenter Ruehle, Bietigheim-Bissingen, DE;
Dr. Ing. H.c.f. Porsche AG, Weissach, DE;
Abstract
A multiple-disk visco-clutch is arranged in the drive line of the front axle and the rear axle of a four wheel-drive motor vehicle. In order to prevent an overheating of the multiple-disk visco-clutch, such as when the vehicle is being towed, the visco-clutch is separable from the drive line by means of a shiftable toothed clutch. The lubricating-oil pressure, the intake pipe vacuum or other characteristic quantities of the motor vehicle may be used for actuating the toothed clutch when the internal-combustion engine is stopped, thereby automatically causing the separating of the multiple disk visco-clutch from the drive line.