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:
Jun. 17, 2003
Filed:
Nov. 08, 2001
Robert W. Stairs, Westwood, MA (US);
David S. Greeley, Lexington, MA (US);
Robert Bosch Corporation, Waltham, MA (US);
Abstract
An efficient axial flow fan comprises a central hub, a plurality of blades, and a band, and is designed to operate in a shroud and induce flow through one or more heat exchangers—in an automotive engine cooling assembly, for example. The fan blades have a radial distribution of pitch ratio that provides high efficiency and low noise in the non-uniform flow field created by the heat exchanger(s) and shroud. The blade has either no sweep, or is swept backward (i.e. opposite the direction of rotation) in the region between the radial location r/R=0.70 and the tip (r/R=1.00). The blade pitch ratio increases from the radial location r/R=0.85 to a radial location between r/R=0.90 and r/R=0.975, and then decreases to the blade tip.