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:
Apr. 11, 2006
Filed:
Jun. 16, 2004
Yoshihiko Honda, Obu, JP;
Kazumichi Hanai, Obu, JP;
Koichi Iwata, Obu, JP;
Aisan Kogyo Kabushiki Kaisha, Obu, JP;
Abstract
Mass-produced fuel pumps having a stable pump efficiency comprising a circumferential grooveis formed within a pump bodyand the grooveis divided into a first region having a constant cross-sectional area L, a second region having a cross sectional area that gradually becomes smaller toward the downstream side, and a third region having a constant cross-sectional area M. A suction holeis formed within the pump bodyand is inclined toward the rotational direction of the impeller. The suction holeis communicated with the groovein the first region. Even if the inclination angle of the suction holevaries among mass-produced fuel pumps, the cross-sectional area L of the grooveis constant at the location where the suction holeis communicated with the groove. Therefore, variations in the amount of fuel sucked into the fuel pump can be reduced. Accordingly, pump efficiency of the mass-produced fuel pumps can be stabilized.