Title:
ショベル
Document Type and Number:
Japanese Patent JP6644536
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a shovel capable of using hydraulic oil flowing out of a bottom-side oil chamber of a boom cylinder in boom lowering operation selectively for a plurality of purposes of use.SOLUTION: A shovel comprises: a plurality of attachments including a boom; a plurality of hydraulic actuators including a boom cylinder hydraulically driving the boom, and hydraulically driving the plurality of attachments respectively; a hydraulic pump supplying hydraulic oil to the plurality of hydraulic actuators; a boom control valve capable of guiding hydraulic oil from a hydraulic pump to a bottom-side oil chamber of the boom cylinder; and a regenerative control valve connected to the boom control valve in series through a predetermined oil passage. The boom control valve is configured to link the bottom-side oil chamber of the boom cylinder to the predetermined oil passage, and the regenerative control valve has an input port connected to the predetermined oil passage, and a first output port and a second output port, and is configured to selectively link the input port and the first output port, and the input port and the second output port to each other.SELECTED DRAWING: Figure 4
Inventors:
Koji Kawashima
Application Number:
JP2015240530A
Publication Date:
February 12, 2020
Filing Date:
December 09, 2015
Export Citation:
Assignee:
Sumitomo Heavy Industries Ltd.
International Classes:
E02F9/22; E02F9/20; F15B21/14
Domestic Patent References:
| JP2015137714A | ||||
| JP2012215016A | ||||
| JP2013053498A |
Foreign References:
| WO2013005809A1 | ||||
| US20130283777 |
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Tadahiko Ito