作業機械の圧油エネルギ再生装置

Japanese Patent JP6453711

B2

A hydraulic fluid energy regeneration system for a work machine capable of securely maintaining a brake pressure even when a solenoid valve or the like is erroneously rendered open by an electrical failure is provided. The hydraulic fluid energy regeneration system for a work machine, including a first hydraulic actuator; a second hydraulic actuator; and a first hydraulic pump that supplies a hydraulic fluid to the first hydraulic actuator via a first hydraulic line, includes: an upper control valve that is connected to a discharge side on which the hydraulic fluid is discharged from the second hydraulic actuator when an object to be driven by the second hydraulic actuator falls under its own weight, and that can regulate a flow rate of the hydraulic fluid discharged from the second hydraulic actuator; a communication hydraulic line that connects the upper control valve to a hydraulic fluid tank; a lower control valve that is provided in the communication hydraulic line and that can regulate a flow rate of the hydraulic fluid discharged from the upper control valve to the hydraulic fluid tank; and a regeneration hydraulic line that has one end side connected to a branch section between the upper control valve and the lower control valve in the communication hydraulic line and that has an other end side connected to the first hydraulic line.

Hijikata Seiji
Koji Ishikawa
Shinya Imura

JP2015112533A

January 16, 2019

June 02, 2015

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Hitachi Construction Machinery Co., Ltd.

F15B21/14; E02F9/22; F15B11/00; F15B11/08; F15B11/17; F15B20/00

JP2008128464A
JP8219121A
JP2004278678A

Kaichi International Patent Office

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