Title:
建設機械
Document Type and Number:
Japanese Patent JP7302986
Kind Code:
B2
Abstract:
To provide a construction machine that has a hydraulic system mounted thereon in which a closed-circuit pump, and an open-circuit pump and a proportional valve are arranged as a pair, and that makes it possible to use an unused open-circuit pump or proportional valve to accelerate the speed of a single rod hydraulic cylinder when the single rod hydraulic cylinder and a hydraulic motor are driven simultaneously. A controller (51) controls a cap-side selector valve (46) and a rod-side selector valve (47) such that a particular open-circuit pump (15) not connected to a single rod hydraulic cylinder (3) is connected to the single rod hydraulic cylinder, and controls an opening area of a particular proportional valve (49) provided on a flow line that connects a delivery port of the particular open-circuit pump to a tank, when the single rod hydraulic cylinder and a hydraulic motor (7) are driven simultaneously.
Inventors:
Takamasa Kai
Shimizu Freedom
Kenji Hiraku
Hiromasa Takahashi
Teppei Saito
Shimizu Freedom
Kenji Hiraku
Hiromasa Takahashi
Teppei Saito
Application Number:
JP2019035774A
Publication Date:
July 04, 2023
Filing Date:
February 28, 2019
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
F15B11/02; E02F9/20; E02F9/22; F15B11/028; F15B11/08; F15B11/17
Domestic Patent References:
| JP2016145603A |
Foreign References:
| WO2013145528A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation Kaichi