Title:
HYDRAULIC DRIVE UNIT
Document Type and Number:
WIPO Patent Application WO/2015/064044
Kind Code:
A1
Abstract:
This hydraulic drive unit (1) drives actuators (7, 9, 10) by supplying said actuators (7, 9, 10) with a hydraulic oil discharged from a hydraulic pump (11). The hydraulic drive device (1) is provided with operation valves (13, 14), a flow rate control mechanism (12), an electromagnetic proportional control valve (27), a failsafe mechanism (25), and a bleed-off valve (15). If the pressure difference between an output pressure (Prcv) and a control pressure (Psol) is within a configured control range (52) set in advance, the failsafe mechanism (25) outputs the control pressure (Psol) as a pilot pressure (Ppil), and, if said pressure difference is not within the configured control range (52), outputs the output pressure (Prcv) as the pilot pressure. The bleed-off valve (15) adjusts the opening area depending on the pilot pressure (Ppil), and discharges the hydraulic oil from the hydraulic pump (11) into a tank at a flow rate depending on the opening area.
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| JP2000120616 | HYDRAULIC CIRCUIT |
Inventors:
KONDO AKIHIRO
HATA NAOKI
FUJIYAMA KAZUTO
HATA NAOKI
FUJIYAMA KAZUTO
Application Number:
PCT/JP2014/005286
Publication Date:
May 07, 2015
Filing Date:
October 17, 2014
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B20/00; E02F9/22; F15B11/02
Foreign References:
| JPH11303809A | 1999-11-02 | |||
| JP2004360898A | 2004-12-24 |
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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