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Patent Searching and Data


Title:
EXCAVATOR, AND CONTROL VALVE FOR EXCAVATOR
Document Type and Number:
WIPO Patent Application WO/2018/021288
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an excavator that can suppress the deterioration of responsiveness of bleed-off control when hydraulic fluid is supplied to a plurality of directional control valves in parallel through a center bypass oil line. For this purpose, an excavator is provided with: a hydraulic pump; a plurality of hydraulic actuators; a center bypass oil line by which hydraulic fluid discharged from the hydraulic pump is supplied; a plurality of directional control valves that are disposed in tandem in the center bypass oil line and that supply hydraulic fluid from the center bypass oil line to each of the plurality of hydraulic actuators, wherein at least the directional control valves other than the directional control valve that is furthest downstream communicate with the center bypass oil line; and a bleed-off valve that is connected to a portion of the center bypass oil line that is further upstream than at least some of the plurality of directional control valves.

Inventors:
KUROKAWA, Tomoki (731-1, Naganumahara-cho, Inage-ku, Chiba-sh, Chiba 01, 〒2630001, JP)
Application Number:
JP2017/026830
Publication Date:
February 01, 2018
Filing Date:
July 25, 2017
Export Citation:
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Assignee:
SUMITOMO(S.H.I.) CONSTRUCTION MACHINERY CO., LTD. (1-1 Osaki 2-chome, Shinagawa-ku Tokyo, 25, 〒1416025, JP)
International Classes:
E02F9/22; F15B11/00; F15B11/02; F15B11/16
Attorney, Agent or Firm:
ITOH, Tadashige et al. (16th Floor, Marunouchi MY PLAZA 1-1, Marunouchi 2-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
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