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:
Mar. 23, 2004
Filed:
Feb. 27, 2003
Tadasu Tomohiro, Toyota, JP;
Yasuo Hojo, Nagoya, JP;
Hideo Tomomatsu, Nagoya, JP;
Yoshikazu Tanaka, Toyota, JP;
Katsumi Nakatani, Nishikamo-gun, JP;
Tooru Matsubara, Toyota, JP;
Atsushi Tabata, Okazaki, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An electric oil pump capable of suppressing wear of an electric oil pump used as auxiliary to a main oil pump to thereby prolong the life of the pump and avoid any need to provide a larger pump. An electric oil pump ( ) is operated only for a predetermined acceptable operation time, and the engine ( ) is thereafter activated to cause the mechanical oil pump ( ) to supply oil pressure. This arrangement can limit successive operating time for the electric oil pump ( ), suppressing wear of the electric oil pump ( ) and thus prolonging its life. Provision of a larger electric oil pump ( ) can also be avoided.