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. 11, 2011
Filed:
Jun. 01, 2007
Masaya Abe, Tokyo, JP;
Kunihiro Ando, Tokyo, JP;
Yoshihito Iwasaki, Tokyo, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
A variable capacity hydraulic pump () drives a concrete agitating drum () via a hydraulic motor (). A hydraulic actuator () regulates a discharge flow rate of the hydraulic pump () depending on an actuator driving pressure. A load sensing valve () generates the actuator driving pressure by reducing a discharge pressure of the hydraulic pump () according to a differential pressure between the discharge pressure and a load pressure acting on the hydraulic motor (). A shut-off valve () shuts off supply of the pressurized oil discharged from the hydraulic pump () to the hydraulic motor (). Due to this action, when the differential pressure increases beyond a predetermined differential pressure, an unload valve () drains the discharged oil, thereby preventing the hydraulic pump () from generating noise due to an excessive increase in the discharge pressure.