Title:
ENERGY REGENERATING SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2015025475
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve energy recovery efficiency by communicating an actuator oil path with a regenerating hydraulic motor at a small pressure loss during regeneration without giving influences to the operation of a hydraulic actuator except during the operation of a relief valve, while securing a pressure held in the hydraulic actuator during regeneration disabled time to suppress unintended operation.SOLUTION: Between one of actuator oil paths 101a, 101b and a regenerating hydraulic motor 61, a first valve device 51 is arranged having a throttle passage 51a for enabling the rise of a pressure in the actuator oil path on the high pressure side up to a set pressure in each of revolving relief valves 48a, 48b. In parallel to the first valve device 51 between the actuator oil path and the regenerating hydraulic motor 61, a second valve device 52 is arranged which is changed over from a closing position E to an opening position F with a pressure between the first valve device 51 and the regenerating hydraulic motor 61 when the pressure between the first valve device 51 and the regenerating hydraulic motor 61 rises to approximate the set pressure in the revolving relief valve.
Inventors:
OKI TAKATOSHI
HIJIKATA SEIJI
HIJIKATA SEIJI
Application Number:
JP2013153889A
Publication Date:
February 05, 2015
Filing Date:
July 24, 2013
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B21/14; E02F9/20; F15B20/00
Attorney, Agent or Firm:
Kasuga 讓
Ino tree Yuichi
Ino tree Yuichi
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