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. 17, 2006
Filed:
Jun. 23, 2003
Horst Braun, Stuttgart, DE;
Horst Braun, Stuttgart, DE;
Robert Bosch Gmbh, Stuttgart, DE;
Abstract
In a radial fan wheel for supplying cooling air for an electrical machine, with a number of fan blades () attached along the circumference of the fan wheel () that have arc-shaped blade ends (), which, at their radially inner edge, enclose a first angle (β) with a tangent () to the inner circumference () of the fan wheel () and at their radially outer edge, enclose a second angle (β) with a tangent () to the outer circumference () of the fan wheel (), the invention proposes that the second angle (β) be selected to be 75% or more greater than the first angle (β) in order to minimize the turbulence noise in the vicinity of the fan blades () during operation of the fan wheel ().