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:
Sep. 24, 1996
Filed:
Oct. 13, 1995
Robert Bosch GmbH, Stuttgart, DE;
Abstract
In a liquid pump of the side channel type, particularly an electric fuel pump, comprising a suction cover (11) having an inlet aperture (12), an intermediate casing (13) having an outlet aperture (14), and a pump impeller (15) enclosed therebetween, and also comprising concentric side channels (21, 22) which are formed in mutually oppositely situated surfaces (111, 131) of the suction cover (11) and intermediate casing (13) and into which lead an inlet opening (12) and an outlet opening (14) respectively, the geometry of the outlet opening (14) is selected, for the purpose of reducing noise and achieving greater smoothness of running, such that its aperture wall (141) bounding the end of the side channel (22) in the intermediate casing (13) extends outward with a concave curvature, at least in the side channel region, from the inner surface (131) of the intermediate casing (13) onward, and that on the other hand the geometry of the end of the side channel in the suction cover (11) has a configuration such that the side channel (21) is given a steeply rising end flank (211).