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:
May. 23, 2006
Filed:
Aug. 27, 2003
Neil E. Robb, Jackson, MI (US);
James E. Ignatovich, Ceresco, MI (US);
Dale M. Pickelman, Marshall, MI (US);
Theodore A. Malott, Jackson, MI (US);
Gary E. Hart, Indianapolis, IN (US);
Neil E. Robb, Jackson, MI (US);
James E. Ignatovich, Ceresco, MI (US);
Dale M. Pickelman, Marshall, MI (US);
Theodore A. Malott, Jackson, MI (US);
Gary E. Hart, Indianapolis, IN (US);
BorgWarner Inc., Auburn Hills, MI (US);
Abstract
A hydraulically controlled fan drive system for controlling the cooling of an engine and having a method of engagement includes a housing assembly containing a hydraulic fluid and an engaging circuit. The engaging circuit includes a pitot tube coupled within the housing assembly that receives at least a portion of the hydraulic fluid as the housing assembly rotates to drive a clutch pack (and coupled fan) via static pressure. A fluid controller having binary control adjusts the static pressure within the pitot tube at a given rotational speed, thereby controlling the engagement of the clutch pack to a fully engaged drive (utilizing friction type engagement), a fully disengaged drive, and at least two partially engaged clutch positions (i.e. partially engaged utilizing a wet viscous type clutch engagement). To control static pressure release, the fluid controller may utilize a dual spool system valving arrangement or a parallel fixed orifice binary control.