Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/206002
Kind Code:
A1
Abstract:
A hydraulic system 1A according to one embodiment includes a plurality of control valves 5A, 5B positioned on center bypass lines 31, 41 extending from variable-capacity pumps 22, 24 to a tank, and relief valves 36, 46 provided to relief lines 35, 45 that bypass throttles 34, 44 provided to the center bypass lines 31, 41. Furthermore, the hydraulic system 1A includes a control device 8 that switches the relief pressure of the relief valves 36, 46 to a first set value, which is substantially zero, when none of a plurality of operating devices 5 for activating the control valves 5A, 5B has been operated, and switches the relief pressure of the relief valves 36, 46 to a second set value when any of the operation devices 5 has been operated.
Inventors:
KONDO AKIHIRO
MURAOKA HIDEYASU
FUKUMOTO TAKUYA
HATA NAOKI
MURAOKA HIDEYASU
FUKUMOTO TAKUYA
HATA NAOKI
Application Number:
PCT/JP2021/014270
Publication Date:
October 14, 2021
Filing Date:
April 02, 2021
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/00; E02F9/22
Foreign References:
| JPH0667559U | 1994-09-22 | |||
| JP2016156393A | 2016-09-01 | |||
| JP2016156426A | 2016-09-01 | |||
| US20160002888A1 | 2016-01-07 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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