Title:
HYDRAULIC CONTROL SYSTEM FOR WORKING MACHINE
Document Type and Number:
WIPO Patent Application WO/2008/007484
Kind Code:
A1
Abstract:
A hydraulic control system for a working machine, where potential energy of a
working section that vertically moves is reliably recovered and reused and where
an inconvenience such as reduction in the speed of the working section is avoided
in reuse of the recovered potential energy. The hydraulic control system has
a first main pump (9) for drawing oil from an oil tank (11) and discharging it, an
accumulator for accumulating under pressure the oil discharged from a head side
oil chamber (8a) of a boom cylinder (8) when the working section is lowered; and
a hybrid pump (32) for drawing the oil accumulated under pressure in the accumulator.
The hydraulic control system is constructed such that, when the a boom is lifted,
oil discharged from the hybrid pump (32) is supplied to the head side oil chamber
(8a) and, when the supply flow rate from the hybrid pump (32) is insufficient,
the deficiency is supplied to the head side oil chamber (8a) from the first main
pump (9).
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Inventors:
WADA, Atsushi (10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
和田 篤志 (〒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)
MORIYA, Naoyuki (10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
守屋 直行 (〒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)
和田 篤志 (〒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)
MORIYA, Naoyuki (10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
守屋 直行 (〒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:
JP2007/057403
Publication Date:
January 17, 2008
Filing Date:
April 02, 2007
Export Citation:
Assignee:
SHIN CATERPILLAR MITSUBISHI LTD. (10-1, Yoga 4-chome,Setagaya-ku, Tokyo30, Tokyo1588530, 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, Tokyo1588530, JP)
WADA, Atsushi (10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
和田 篤志 (〒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)
MORIYA, Naoyuki (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, Tokyo1588530, JP)
WADA, Atsushi (10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
和田 篤志 (〒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)
MORIYA, Naoyuki (10-1 Yoga 4-chome, Setagaya-k, Tokyo 30, 1588530, JP)
International Classes:
F15B21/14; E02F9/22
Attorney, Agent or Firm:
HIROSE, Tetsuo (Nakanishi Bldg, 5th Floor 2-5-6, Nishikanda,,Chiyoda-ku, Tokyo65, Tokyo1010065, JP)
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