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:
Jan. 06, 2015
Filed:
Mar. 21, 2012
Manabu Watanabe, Gunma-ken, JP;
Junichi Miyajima, Gunma-ken, JP;
Masato Izutsu, Gunma-ken, JP;
Takatoshi Watanabe, Gunma-ken, JP;
Manabu Watanabe, Gunma-ken, JP;
Junichi Miyajima, Gunma-ken, JP;
Masato Izutsu, Gunma-ken, JP;
Takatoshi Watanabe, Gunma-ken, JP;
Yamada Manufacturing Co., Ltd., Kiryu-Shi, Gunma-Ken, JP;
Abstract
The invention has: a housing; a pump section formed of a drive gear unit and a driven gear unit; a main flow channel through which oil pressure is applied to the driven gear unit in a discharge volume reduction direction; a first branching flow channel through which oil pressure that assists oil pressure from the main flow channel is applied; a second branching flow channel through which oil pressure is applied to the driven gear unit in a discharge increase direction; a first flow channel control section; a second flow channel control section; and a spring that elastically urges the driven gear unit in a discharge increase direction. The first flow channel control section and the second flow channel control section can perform switching control in accordance with each increase or decrease of engine revolutions and in pressure.