Title:
HYDRAULIC DRIVE DEVICE OF CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/148449
Kind Code:
A1
Abstract:
The present invention is configured in a manner so that, in addition to a main pump (102) that performs load sensing control and is provided with two discharge ports (102a, 102b), two subpumps (202, 302) are provided that perform load sensing control and are for performing assisting driving of a boom cylinder (3a) and an arm cylinder (3b); when driving the boom cylinder (3a) or the arm cylinder (3b), a switching valve (141 or 241) is switched, causing the confluence and supply of hydraulic fluid, and during actuator driving not of the boom cylinder (3a) or arm cylinder (3b), hydraulic fluid of just the main pump is supplied. In other words, by causing two specific actuators for which it is common for the load pressure to greatly differ when driven simultaneously and when the requested flow rate is large to be able to be driven by means of hydraulic fluid from separate discharge ports, wasted energy consumption resulting from a pressure drop of a pressure compensation valve is suppressed, and it is possible to use a hydraulic pump at a point having favorable volumetric efficiency when driving an actuator having a low requested flow rate.
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Inventors:
TAKAHASHI KIWAMU (JP)
TSURUGA YASUTAKA (JP)
TAKEBAYASHI YOSHIFUMI (JP)
MORI KAZUSHIGE (JP)
NAKAMURA NATSUKI (JP)
TSURUGA YASUTAKA (JP)
TAKEBAYASHI YOSHIFUMI (JP)
MORI KAZUSHIGE (JP)
NAKAMURA NATSUKI (JP)
Application Number:
PCT/JP2014/057207
Publication Date:
September 25, 2014
Filing Date:
March 17, 2014
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/00; F15B11/05; F15B11/17
Domestic Patent References:
| WO2012111525A1 | 2012-08-23 |
Foreign References:
| JP2012067459A | 2012-04-05 | |||
| JPH0925652A | 1997-01-28 | |||
| JP2581858Y2 | 1998-09-24 | |||
| JP2004150198A | 2004-05-27 | |||
| DE3433896A1 | 1985-03-28 | |||
| JP2011247282A | 2011-12-08 | |||
| JP2001193705A | 2001-07-17 | |||
| JP2581858Y2 | 1998-09-24 | |||
| JP2011196438A | 2011-10-06 | |||
| JP2012067459A | 2012-04-05 |
Other References:
See also references of EP 2977620A4
Attorney, Agent or Firm:
KAICHI IP (JP)
Patent business corporation development-of-knowledge international patent firm (JP)
Patent business corporation development-of-knowledge international patent firm (JP)
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