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. 27, 2003
Filed:
Mar. 04, 2002
Masatoshi Takagi, Takahama, JP;
Denso Corporation, Kariya, JP;
Abstract
A trochoid pump composed of an inner gear and an outer gear is used as a fluid pump such as a fuel pump for an automotive vehicle. An inner imbalance load inherently developing in the pumping chambers is suppressed or canceled by an outer imbalance load generated by pressurizing fluid introduced into blade ditches formed on an outer periphery of the outer gear. Positions of a pressure-introducing port and a pressure-releasing port for the blade ditches are selected so that the outer imbalance load is imposed in a direction opposing the inner imbalance load. An amount of the outer imbalance load is made equal to an amount of the inner imbalance load to eliminate undesirable effects of the inner imbalance load.