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Title:
HYDRAULIC SHOVEL DRIVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/071044
Kind Code:
A1
Abstract:
This hydraulic shovel drive system comprises: a first pump that supplies hydraulic oil to a boom cylinder through a boom control valve and supplies hydraulic oil to a bucket cylinder through a first bucket control valve; a second pump that supplies hydraulic oil to an arm cylinder through an arm control valve; a third pump that supplies hydraulic oil to a swing motor through a swing control valve and supplies hydraulic oil to the bucket cylinder through a second bucket control valve; and a control device that operates either the first bucket control valve or the second bucket control valve when a bucket dig operation or a bucket dump operation is executed simultaneously with another operation and operates both the first bucket control valve and the second bucket control valve when the bucket dig operation alone is executed.

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Inventors:
KONDO AKIHIRO
ITO MAKOTO
AOKI SEIJI
SAKAMOTO MORIYUKI
YUDATE YOJI
Application Number:
PCT/JP2019/034779
Publication Date:
April 09, 2020
Filing Date:
September 04, 2019
Export Citation:
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Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
E02F9/22; F15B11/17
Foreign References:
JPH10299027A1998-11-10
JP2005299376A2005-10-27
JPS6235917B21987-08-04
JP2012241803A2012-12-10
JP2008115990A2008-05-22
JP2008274988A2008-11-13
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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