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:
Aug. 13, 2013
Filed:
Apr. 08, 2010
Akira Tsutsui, Kobe, JP;
Hiroaki Kawai, Kobe, JP;
Takahiro Kobayashi, Akashi, JP;
Koichi Shimomura, Akashi, JP;
Akira Tsutsui, Kobe, JP;
Hiroaki Kawai, Kobe, JP;
Takahiro Kobayashi, Akashi, JP;
Koichi Shimomura, Akashi, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Kobelco Cranes Co., Ltd., Tokyo, JP;
Abstract
Provided is a braking control apparatus for a slewing type working machine capable of giving a braking operation easily intuitively grasped. This apparatus includes: a flow control valve actuator increasing an opening of a flow control valve between a slewing hydraulic motor and a hydraulic pump according to an operation amount of a slewing operation member; pressure control valves limiting respective maximums of an inlet and outlet pressures of the hydraulic motor to a set value corresponding to a pressure command signal to be input; a motor-side pressure controller which retains a set pressure of the motor inlet sided pressure control valve to a pressure for motor driving and lets a set pressure of the motor outlet side pressure control valve be a set pressure for a braking torque corresponding to an operation amount of a braking operation member other than the slewing operation member; and a valve opening limiter reducing the opening of the flow control valve in correspondence with the operation of the braking operation member.