Title:
HYDRAULIC DRIVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/162353
Kind Code:
A1
Abstract:
This hydraulic drive system comprises a variable-capacity first hydraulic pump, a first regulator having a first proportional valve, a second hydraulic pump that discharges hydraulic fluid, a switching valve, a control device, and a malfunction detection device. The switching valve can switch to a third valve position at which the hydraulic fluid discharged by both the first and second hydraulic pumps can be supplied to first and second for-travel hydraulic motors and first and second hydraulic actuators. The control device outputs a first flow rate command signal to the first proportional valve to control the actions of the first proportional valve, and switches the switching valve to the third valve position when the malfunction detection device detects an electrical system malfunction pertaining to the first proportional valve.
Inventors:
KONDO AKIHIRO
HATA NAOKI
KINOSHITA NOBUYUKI
HATA NAOKI
KINOSHITA NOBUYUKI
Application Number:
PCT/JP2020/003660
Publication Date:
August 13, 2020
Filing Date:
January 31, 2020
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B20/00; E02F9/20; E02F9/24; F15B11/02
Foreign References:
| JP2010156135A | 2010-07-15 | |||
| US20130255244A1 | 2013-10-03 |
Attorney, Agent or Firm:
ISHIDA, Shoji (JP)
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