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:
Oct. 31, 2006
Filed:
Dec. 03, 2001
Mikio Suzuki, Kariya, JP;
Yoshiharu Inaguma, Kariya, JP;
Keiji Suzuki, Kariya, JP;
Hideya Kato, Kariya, JP;
Tsuyoshi Ikeda, Kariya, JP;
Mikio Suzuki, Kariya, JP;
Yoshiharu Inaguma, Kariya, JP;
Keiji Suzuki, Kariya, JP;
Hideya Kato, Kariya, JP;
Tsuyoshi Ikeda, Kariya, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Abstract
In a hydraulic pump, a cam ring is provided in a cylindrical adaptor for movement in a radial direction, and a differential pressure control valve is provided to control internal pressure and load pressure at the front and back sides of a variable orifice to be introduced into action chambers and formed at the opposite sides of the cam ring for controlling a discharge amount of the pump in accordance with the rotation speed of the pump. The differential pressure control valve is operated under the internal pressure and load pressure respectively introduced into action chambers and the load of a thrust spring biasing the differential pressure control valve toward the internal pressure chamber. The load of the thrust spring is increased or decreased in accordance with an increase or a decrease of the load pressure. The increase or decrease of the load pressure is effected by a load pressure responsive piston loaded by a thrust spring and engaged with the differential pressure control valve at one end thereof in the internal pressure chamber.