Title:
FLUID PRESSURE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2008/015802
Kind Code:
A1
Abstract:
A fluid pressure circuit where, independent of which one of a first actuator receiving
supply of operation fluid from a first pump and a second actuator receiving supply
of operation fluid from a second pump is operated, any one of the first pump and
the second pump can supply the operation fluid to a specific actuator to enhance
performance in operational association between the fluid pressure circuit
and the specific actuator. A control valve (16) is integral with spools of a first
group receiving supply of the operation fluid from a drive pump (12) and with spools
of a second group receiving supply of operation oil from an idle pump (13). When
a first pressure switch (28) detects spool operation, an electromagnetic switchover
valve device (27) switches over a pilot line of a tool control spool (16at2) of
the second group to a communicated state, and when a second pressure switch (29)
detects spool operation, the valve device (27) switches over a pilot line of a
tool control spool (16at1) to a communicated state.
Inventors:
NISHIKAWA, Hiroyasu (C/O SHIN CATERPILLAR MITSUBISHI LTD, 10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
西川 裕康 (〒30 東京都世田谷区用賀四丁目１０番１号 新キャタピラー三菱株式会社内 Tokyo, 1588530, JP)
西川 裕康 (〒30 東京都世田谷区用賀四丁目１０番１号 新キャタピラー三菱株式会社内 Tokyo, 1588530, JP)
Application Number:
JP2007/053029
Publication Date:
February 07, 2008
Filing Date:
February 20, 2007
Export Citation:
Assignee:
SHIN CATERPILLAR MITSUBISHI LTD. (10-1, Yoga 4-chome Setagaya-k, Tokyo 30, 1588530, JP)
新キャタピラー三菱株式会社 (〒30 東京都世田谷区用賀四丁目１０番１号 Tokyo, 1588530, JP)
NISHIKAWA, Hiroyasu (C/O SHIN CATERPILLAR MITSUBISHI LTD, 10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
新キャタピラー三菱株式会社 (〒30 東京都世田谷区用賀四丁目１０番１号 Tokyo, 1588530, JP)
NISHIKAWA, Hiroyasu (C/O SHIN CATERPILLAR MITSUBISHI LTD, 10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
International Classes:
F15B11/02; E02F9/22; F15B11/17
Attorney, Agent or Firm:
KABASAWA, Joo et al. (NSO BLDG, 1-22Shinjuku 3-chome, Shinjuku-k, Tokyo 22, 1600022, JP)
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