Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/152937
Kind Code:
A1
Abstract:
The present invention provides a construction machine on which is mounted a hydraulic closed circuit for driving a single rod-type hydraulic cylinder and a slewing hydraulic motor, and that exhibits good slewing deceleration responsiveness. In this construction machine that drives a single rod-type hydraulic cylinder and a slewing hydraulic motor with respective closed circuits, the minimum flow passage area from a second flushing valve to a tank when the second flushing valve is fully open, is smaller than the minimum flow passage area from a first flushing valve to the tank when the first flushing valve is fully open.
Inventors:
SAITOH TEPPEI (JP)
TAKAHASHI HIROMASA (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
HIRAKU KENJI (JP)
Application Number:
PCT/JP2019/043331
Publication Date:
July 30, 2020
Filing Date:
November 05, 2019
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/08; F15B11/17
Foreign References:
| JPS59208205A | 1984-11-26 | |||
| JPS58144104U | 1983-09-28 | |||
| JP2016017602A | 2016-02-01 |
Other References:
See also references of EP 3835598A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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