An oil pressure control device of an operating machine

Japanese Patent JP6212009

B2

An object of the present invention is to provide a hydraulic control system for a work machine that is capable of reducing the loss caused by flow division while reducing a decrease in the speed of a hydraulic actuator due to a combined operation. The hydraulic control system for a work machine includes a first hydraulic actuator, one hydraulic pump, a second hydraulic actuator, and another hydraulic pump. The hydraulic control system further includes operating instruction detection means and pump flow control means. The operating instruction detection means detects that operating instructions are issued to the first hydraulic actuator and the second hydraulic actuator. The pump flow control means individually adjusts the delivery flow rate of the one hydraulic pump and the another hydraulic pump in accordance with operation amounts designated by the operating instructions for the first and second hydraulic actuators. When the first and second hydraulic actuators are simultaneously operated, the pump flow control means increases the delivery flow rate of the one hydraulic pump to a higher rate than when the first hydraulic actuator is operated and the second hydraulic actuator is not operated.

JP2551344	[Name of device] Hydraulic circuit of construction machinery
JP2690353	[Title of the Invention] A make-up device for a hydraulic circuit using a load sensing system.
JP3943779	HYDRAULIC DRIVING DEVICE FOR CIVIL ENGINEERING/ CONSTRUCTION MACHINERY

Shuichi Moriki
Shinya Imura
Koji Ishikawa
Ryohei Yamashita

JP2014187120A

October 11, 2017

September 12, 2014

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Hitachi Construction Machinery Co., Ltd.

F15B11/00; E02F9/22; F15B11/02; F15B11/17

JP2013181286A
JP59194105A
JP2005083427A
JP2010025146A

US20060130473

Kaichi International Patent Office

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