Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/066029
Kind Code:
A1
Abstract:
Provided is a construction machine with which it is possible to push out a bucket in a straight line merely by an operator operating an arm in the push-out direction. When a straight-line trajectory is selected using a bucket trajectory selection device 52, a controller 50 calculates a fixed flow rate ratio α that corresponds to a boom initial angle, which is the angle of a boom 2 detected by a boom angle detection device 33 at the time that an arm 4 is operated in the push-out direction using an operation device 51. During a period in which the arm 4 is operated in the push-out direction using the operation device 51 and no action of the boom 2 is instructed, the controller 50 controls the discharge flow rate of a first liquid pressure pump 12 so that liquid is discharged from a cap chamber 1a of a boom cylinder 1 at a flow rate Qb, which is obtained by multiplying, by the flow rate ratio α, a flow rate Qa supplied to a cap chamber 3a of an arm cylinder 3.
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Inventors:
SHIMIZU JURI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOH TEPPEI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SAITOH TEPPEI (JP)
Application Number:
PCT/JP2020/037212
Publication Date:
April 08, 2021
Filing Date:
September 30, 2020
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F3/43; F15B11/02; F15B11/08; F15B11/17
Foreign References:
| JP2016145603A | 2016-08-12 | |||
| JP2001090703A | 2001-04-03 | |||
| JP2010059738A | 2010-03-18 | |||
| JPS5681741A | 1981-07-04 | |||
| JPS5026865Y1 | 1975-08-11 | |||
| US20180202126A1 | 2018-07-19 | |||
| JP2016145603A | 2016-08-12 |
Attorney, Agent or Firm:
KAICHI IP (JP)
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