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Patent Searching and Data


Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2021/039286
Kind Code:
A1
Abstract:
This hydraulic system includes a turning motor (81), a mechanical brake (83), and a turning control valve (4t) interposed between a main pump (22) and the turning motor (81). A first pilot port of the turning control valve (4t) is connected to a first solenoid proportional valve (6a) by a first pilot line (5a), and a second pilot port is connected to a second solenoid proportional valve (6b) by a second pilot line (5b). The first solenoid proportional valve (6a) and the second solenoid proportional valve (6b) are connected to an auxiliary pump (23) by a primary pressure line (41). A switching valve (52) is interposed between the auxiliary pump (23) and the mechanical brake (83), said switching valve (52) having a pilot port connected to the first pilot line (5a) by a switch pilot line (61) and switching from a closed position to an open position when the pilot pressure fed into the pilot port is greater than or equal to a set value.

Inventors:
KONDO AKIHIRO
HATA NAOKI
KINOSHITA NOBUYUKI
Application Number:
PCT/JP2020/029482
Publication Date:
March 04, 2021
Filing Date:
July 31, 2020
Export Citation:
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Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
E02F9/22; F15B11/08
Foreign References:
JP2019085791A2019-06-06
JP2014134015A2014-07-24
JP2010216209A2010-09-30
JP2010156395A2010-07-15
JP2003184808A2003-07-03
JP2001027202A2001-01-30
JPH03129019A1991-06-03
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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