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:
Dec. 23, 2008
Filed:
Jun. 01, 2007
Masaya Abe, Tokyo, JP;
Kunihiro Ando, Tokyo, JP;
Yoshihito Iwasaki, Tokyo, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
An agitating drum driving device comprises a hydraulic motor () for rotating an agitating drum (), and a swash-plate type hydraulic pump () connected to a combustion engine () to supply pressurized oil to drive the hydraulic motor (). When the engine rotation speed is not higher than a predetermined speed, the swash-plate angle of a swash-plate () is regulated to keep a differential pressure between a pressure of the pressurized oil and a load pressure acting on the hydraulic motor () constant. When the engine rotation speed rises above the predetermined speed, the flow rate of the pressurized oil is increased as the engine rotation speed increases while relatively decreasing an increasing rate of the flow rate of the pressurized oil with respect to an increase rate of the engine rotation speed as the engine rotation speed increases.