Title:
HYDRAULIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/187007
Kind Code:
A1
Abstract:
In order to facilitate a manufacturing operation and an assembly operation, an arm first direction switching valve 41 incorporates an arm regeneration passage 43 through which oil discharged from a rod chamber a4 when an arm hydraulic cylinder CA is extended can be supplied to a bottom chamber a3. A controller 100 monitors the pressure condition of the arm hydraulic cylinder CA. When determining that an oil flow through the arm regeneration passage 43 is possible, the controller 100 blocks an oil circulation between the arm hydraulic cylinder CA and an arm second direction switching valve 42. On the other hand, when determining that the oil flow through the arm regeneration passage 43 is not possible, the controller 100 operates the arm second direction switching valve 42 so that oil can be supplied from a second hydraulic pump 22 to the bottom chamber a3.
Inventors:
HISHINUMA YUICHI (JP)
NAGURA SHINOBU (JP)
NAGURA SHINOBU (JP)
Application Number:
PCT/JP2021/006408
Publication Date:
September 23, 2021
Filing Date:
February 19, 2021
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
E02F9/22; F15B11/02; F15B11/024; F15B11/028
Domestic Patent References:
| WO2019220872A1 | 2019-11-21 |
Foreign References:
| JP2011220356A | 2011-11-04 | |||
| JP2014163426A | 2014-09-08 | |||
| JP2017201072A | 2017-11-09 | |||
| JP2001304202A | 2001-10-31 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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