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:
Apr. 11, 1995
Filed:
Jun. 28, 1993
Hans Martin, Stuttgart, DE;
Werner Hummel, Affalterbach, DE;
Behr GmbH & Co., Stuttgart, DE;
Abstract
To increase the idling rotational speed of a fluid friction coupling, the static pressure in the reservoir space is increased by a differential pressure valve which opens toward the reservoir chamber at a defined differential pressure between the working chamber and the reservoir chamber. The fluid friction coupling includes a driving element; a driven-end coupling housing including a reservoir chamber and a working chamber; a partition for separating the reservoir chamber from the working chamber; a return passage arranged in the coupling housing between the working chamber and the reservoir chamber; and a differential pressure valve arranged within or in the region of the return passage.