Title:
HYDRAULIC PRESSURE CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/068973
Kind Code:
A1
Abstract:
This hydraulic pressure control device (1) is provided with a directional valve (26), an operated valve (36), a first back pressure output mechanism (42), and a second shuttle valve (41). Upon operation of an operating lever (37), the operated valve (36)outputs a first output pressure (P01) commensurate to the operational input, and once a predetermined operating level is satisfied, the first back pressure output mechanism (42) outputs a first back pressure (Pb1). The first output pressure (P01) is input as a first pilot pressure (P1) to the directional valve (26), and the first back pressure (Pb1) is input as a second pilot pressure (P2) to the directional valve (26). The directional valve (26) is designed to supply a cylinder (7) for a boom with hydraulic pressure commensurate to the pressure differential of the first and second pilot pressures (P1, P2).
Inventors:
KONDO AKIHIRO
ITO MAKOTO
FUJIYAMA KAZUTO
SAKASHITA KOJI
ITO MAKOTO
FUJIYAMA KAZUTO
SAKASHITA KOJI
Application Number:
PCT/JP2013/006426
Publication Date:
May 08, 2014
Filing Date:
October 30, 2013
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/08; E02F9/22; F15B21/045
Foreign References:
| JP2012052583A | 2012-03-15 | |||
| JPH05248404A | 1993-09-24 | |||
| JPH058003U | 1993-02-02 | |||
| JP2012007713A | 2012-01-12 | |||
| JPS646501A | 1989-01-11 |
Other References:
See also references of EP 2916011A4
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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