Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/039287
Kind Code:
A1
Abstract:
A hydraulic system (1A) according to one aspect includes: a plurality of control valves (4) interposed between a main pump (22) and a plurality of hydraulic actuators; and a plurality of solenoid proportional valves (6) respectively connected to pilot ports of the control valves (4). Among the solenoid proportional valves (6), a first solenoid proportional valve (6a) and a second solenoid proportional valve (6b) are respectively connected to a pair of pilot ports of a specific control valve. The first solenoid proportional valve (6a) and the second solenoid proportional valve (6b) are directly connected to an auxiliary pump (23), and the other solenoid proportional valves (6) are connected to the auxiliary pump (23) via a switching valve (52). The switching valve (52) has a pilot port that, by means of a switching pilot line (54), is connected to a first pilot line (5a) between the first solenoid proportional valve (6a) and the specific control valve.
Inventors:
KONDO AKIHIRO
HATA NAOKI
NAKAGAWA HITOSHI
HATA NAOKI
NAKAGAWA HITOSHI
Application Number:
PCT/JP2020/029483
Publication Date:
March 04, 2021
Filing Date:
July 31, 2020
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/08; E02F9/22
Foreign References:
| JP2017110672A | 2017-06-22 | |||
| JP2006327745A | 2006-12-07 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
Download PDF:
Previous Patent: HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY
Next Patent: PRESENCE DETERMINATION DEVICE
Next Patent: PRESENCE DETERMINATION DEVICE