Title:
油圧ショベル
Document Type and Number:
Japanese Patent JP6683641
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To automatically change the flow rate of hydraulic fluid supplied to a hydraulic actuator for attachment drive according to the type of attachment attached to a front work machine.SOLUTION: When an operation valve 14 for an attachment is operated in a state in which an operation mode of the attachment is selected by an attachment selection device 30 in the operation mode in which the attachment is driven by the large flow rate of hydraulic fluid supplied from two main pumps, a controller 20 determines whether the attachment operated by the operation valve 14 for an attachment is a breaker or not. When determining that the attachment is a breaker, confluent selector valves 11a and 11b provided in a confluent pipe line 10 connecting discharge lines of the two main pumps are switched from a confluent position to a nonconfluent position.SELECTED DRAWING: Figure 6
Inventors:
Shirakawa
Hideo Karasawa
Nara saki Akihiro
Katsuaki Odaka
Hideo Karasawa
Nara saki Akihiro
Katsuaki Odaka
Application Number:
JP2017031410A
Publication Date:
April 22, 2020
Filing Date:
February 22, 2017
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/22; F15B11/02; F15B11/08; F15B20/00
Domestic Patent References:
| JP8199632A | ||||
| JP2008133842A | ||||
| JP2011163031A | ||||
| JP2004074331A | ||||
| JP2010106487A | ||||
| JP2002294758A |
Foreign References:
| WO2006129399A1 | ||||
| US20120291427 | ||||
| US20090132131 | ||||
| US20080296522 |
Attorney, Agent or Firm:
Patent Business Corporation Takewa International Patent Office