Title:
HYDRAULICALLY DRIVEN SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2011/148693
Kind Code:
A1
Abstract:
There is formed a travel detection device which detects, by means of shuttle valves (37a, 37b, 37c), whether a travel operation is being performed. There is also formed a setting change device whereby the target differential pressure for load sensing control is set to an absolute pressure Pa when a travel operation is not being performed, and whereby the target differential pressure for load sensing control is set to an absolute pressure Pa' by replacing the absolute pressure Pa with Pa', when a travel operation is being performed, the setting operations mentioned above being performed by means of a selector valve (39), a pressure reducing valve (42), a pressure sensing section (35d) of an LS control valve (35b), and a rotational speed detection valve device (30) which contains a differential pressure reducing valve (30b). Due to the above it follows that in the case of actuator operations other than a travel operation, the required maximum flow rate is supplied, as in the case of prior art, resulting in the required actuator speed being able to be obtained, that furthermore, flow rates corresponding to the opening area ratios of flow rate control valves for the actuators under different load pressure can be distributed during combined operations, and that energy loss is reduced in a travel operation, resulting in the energy efficiency being able to be improved.
Inventors:
MORI Kazushige (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
森 和繁 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
TSURUGA Yasutaka (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
釣賀 靖貴 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
森 和繁 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
TSURUGA Yasutaka (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
釣賀 靖貴 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
Application Number:
JP2011/055550
Publication Date:
December 01, 2011
Filing Date:
March 09, 2011
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (5-1 Koraku 2-chome, Bunkyo-ku Tokyo, 63, 〒1128563, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目５番１号 Tokyo, 〒1128563, JP)
MORI Kazushige (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
森 和繁 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
TSURUGA Yasutaka (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目５番１号 Tokyo, 〒1128563, JP)
MORI Kazushige (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
森 和繁 (〒13 茨城県土浦市神立町６５０番地 日立建機株式会社土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
TSURUGA Yasutaka (Tsuchiura Works, Intellectual Property Department, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
International Classes:
F15B11/00; E02F9/22; F15B11/05; F15B11/08
Attorney, Agent or Firm:
KASUGA Yuzuru (Torii-nihonbashi Bldg, 4-1 Nihonbashi-honcho 3-chome, Chuo-k, Tokyo 23, 〒1030023, JP)
Claims:
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