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. 15, 2008
Filed:
Jan. 11, 2001
Hans Heinle, Biessenhofen, DE;
Siegfried Leutner, Kaufbeuren, DE;
Hans Heinle, Biessenhofen, DE;
Siegfried Leutner, Kaufbeuren, DE;
AGCO GmbH & Co, Marktoberdorf, DE;
Abstract
A drive for a cooling fan at motor vehicles including a main cooling circuit and at least one secondary cooling circuit using a fluid friction clutch including a control element for the drive of the cooling fan is described. In case of a plurality of cooling circuits, such fluid friction clutches do not react as desired by actuating the cooling fan. To prevent this disadvantage, a drive for a cooling fan being drivable by a fluid friction clutch is to be provided, in which the cooling fan starts operation as soon as there is a requirement in at least one of the cooling circuits. For this reason, temperature sensors are allocated to selected secondary cooling circuits and further control element is allocated to the working chamber to bypass the control element, the control element freeing a further opening being located in the separating wall when predetermined temperatures and temperature ranges, respectively, are attained in at least one of the selected secondary cooling circuits, the opening not being influenced by the control element.