Title:
EXCAVATOR
Document Type and Number:
WIPO Patent Application WO/2019/112063
Kind Code:
A1
Abstract:
This excavator (100) comprises: a lower belt (1); an upper rotating body (3); an engine (11); a main pump (14); a hydraulic oil tank (T); a plurality of hydraulic actuators; and a hydraulic circuit connected to the main pump (14). The hydraulic circuit comprises a plurality of control valves (170-174R) which can control the flow of hydraulic oil between the main pump (14) and the plurality of hydraulic actuators; and a joint bleed-off valve (56) which can collectively control the bleed-off flow rate of the plurality of control valves (170-174R). The hydraulic circuit is constituted in such a manner that when starting the engine (11), the discharge pressure of the main pump (14) does not exceed a predetermined pressure.
Inventors:
MISAKI YOUJI (JP)
Application Number:
PCT/JP2018/045191
Publication Date:
June 13, 2019
Filing Date:
December 07, 2018
Export Citation:
Assignee:
SUMITOMO SHI CONSTR MACH CO (JP)
International Classes:
F15B11/00; E02F9/20; E02F9/22; E02F9/24; F15B11/028; F15B11/08
Domestic Patent References:
| WO2014061741A1 | 2014-04-24 |
Foreign References:
| JP2014227949A | 2014-12-08 | |||
| JPH1018359A | 1998-01-20 | |||
| JP2010107009A | 2010-05-13 | |||
| JPH1018359A | 1998-01-20 | |||
| JP2017235185A | 2017-12-07 |
Other References:
See also references of EP 3722618A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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