Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/179204
Kind Code:
A1
Abstract:
Provided is a construction machine with which an operator can linearly push out a bucket by only operating an arm in the push-out direction. A controller 50 calculates a certain flow rate ratio according to a boom initial angle which is an angle of a boom 2 detected by a boom angle detection device 33 at the time when a command of a push-out operation of an arm 4 is started via an operation device 51 when a linear trajectory is selected via a bucket trajectory selection device 52. In addition, the controller controls the inclination amount of a first hydraulic pump 12 so that a flow rate Qb is discharged from a bottom chamber 1a of the boom cylinder 1, wherein the flow rate Qb is obtained by multiplying the flow rate ratio to a flow rate Qa supplied to a bottom chamber 3a of an arm cylinder 3 while the push-out operation of the arm is instructed via the operation device and the operation of the boom 2 is not instructed.
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Inventors:
SHIMIZU JURI (JP)
HIRAKU KENJI (JP)
SAITOU TEPPEI (JP)
TAKAHASHI HIROMASA (JP)
KAI TAKAMASA (JP)
HIRAKU KENJI (JP)
SAITOU TEPPEI (JP)
TAKAHASHI HIROMASA (JP)
KAI TAKAMASA (JP)
Application Number:
PCT/JP2019/050817
Publication Date:
September 10, 2020
Filing Date:
December 25, 2019
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F3/43; F15B11/02; F15B11/17
Foreign References:
| JP2001090703A | 2001-04-03 | |||
| JP2010059738A | 2010-03-18 | |||
| JP2016145603A | 2016-08-12 |
Attorney, Agent or Firm:
KAICHI IP (JP)
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