Title:
作業機械の油圧制御装置
Document Type and Number:
Japanese Patent JP6717686
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a hydraulic control device capable of restricting energy loss while keeping superior operability.SOLUTION: A device provided by this invention comprises a control valve 16; a pilot operator 20; an accumulator 24 connected to a pilot line 22; an unload valve 30 arranged at the pilot line 22; pressure accumulated state sensors 32A, 32B; an unload control unit 40 changing-over the unload valve 30 in response to the pressure accumulated state between an on-load position 30a and an unload position 30b; an accumulator changing-over valve 60 that can be changed over to an allowing position 63 and a restricting position 64 where each of allowance and restriction about flowing-in of pilot oil from the pilot line 22 to the accumulator 24 is carried out; and an accumulator changing-over control unit 40 for keeping the accumulator changing-over valve 60 at the restricting position 64 from an on-load changing-over time until an accumulator return condition is satisfied.SELECTED DRAWING: Figure 1
Inventors:
Etsujiro Imanishi
Naoto Hori
Hitoshi Sakurai
Naoto Hori
Hitoshi Sakurai
Application Number:
JP2016127260A
Publication Date:
July 01, 2020
Filing Date:
June 28, 2016
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
Kobelco Construction Machinery Co., Ltd.
Kobelco Construction Machinery Co., Ltd.
International Classes:
F15B11/00; F15B1/02; F15B1/033; F15B11/02; F15B11/08
Domestic Patent References:
| JP2008101721A |
Foreign References:
| WO2012049812A1 |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro
Masataka Otani
Muramatsu Toshiro