Title:
FLUID PRESSURE DRIVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/111390
Kind Code:
A1
Abstract:
A hydraulic drive system (1), provided with first through third fluid pressure pumps (11-13) and control valves (21, 32, 34, 41, 42). The first boom control valve (21) is connected to the first hydraulic pump (11), and the second arm control valve (34) and the first bucket control valve (32) are connected to the second fluid pressure pumps (12). The turn control valve (41) and the second bucket control valve (42) are connected to the third hydraulic pump (13). When a pilot pressure XAk0 is outputted from a bucket operation device (54) during a turn operation, a command switching device (60) outputs a pilot pressure XAk1 to the first bucket control valve (32), and when a pilot pressure XAk0 is outputted from the bucket operation device (54) when no turn operation is in progress, the command switching device (60) outputs a pilot pressure XAk2 to the second bucket control valve (42).
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Inventors:
KONDO AKIHIRO
ITO MAKOTO
FUJIYAMA KAZUTO
ITO MAKOTO
FUJIYAMA KAZUTO
Application Number:
PCT/JP2015/000144
Publication Date:
July 30, 2015
Filing Date:
January 14, 2015
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
E02F9/22; F15B11/02; F15B11/17
Foreign References:
| JP2009002441A | 2009-01-08 | |||
| JP2013148175A | 2013-08-01 | |||
| US20130098014A1 | 2013-04-25 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
Patent business corporation Owner old patent firm (JP)
Patent business corporation Owner old patent firm (JP)
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