Title:
TRANSPORTATION VEHICLE
Document Type and Number:
WIPO Patent Application WO/2011/135959
Kind Code:
A1
Abstract:
A control valve device (16) comprises two direction control valves (20, 21). The direction control valve (20) has an extension-side variable throttle unit (20c) and a contraction-side throttle unit (20d). The direction control valve (21) has an extension-side variable throttle unit (21c) and a contraction-side throttle unit (21d). A controller (35) determines that a hoist cylinder (10) is approaching a stop position, when the hoist cylinder (10) extends to raise or lower a vessel (3) and the hoist cylinder (10) is approaching the stop position. Based on this determination, the controller (35) uses the variable throttle units (20C, 20D) to variably adjust the flowpath surface area of the direction control valve (20) or uses the variable throttle units (21C, 21D) to variably adjust the flowpath surface area of the direction control valve (21), so that the expansion/contraction speed of the hoist cylinder (10) is increased or decreased according to the weight on the vessel (3) side.
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Inventors:
TAMURA Katsumi (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
田村 克己 (〒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)
MINOSHIMA Toshikazu (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
美濃島 俊和 (〒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)
田村 克己 (〒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)
MINOSHIMA Toshikazu (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
美濃島 俊和 (〒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:
JP2011/057803
Publication Date:
November 03, 2011
Filing Date:
March 29, 2011
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd. (5-1 Koraku 2-chome, Bunkyo-ku Tokyo, 04, 〒1120004, JP)
日立建機株式会社 (〒04 東京都文京区後楽二丁目５番１号 Tokyo, 〒1120004, JP)
TAMURA Katsumi (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
田村 克己 (〒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)
MINOSHIMA Toshikazu (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
日立建機株式会社 (〒04 東京都文京区後楽二丁目５番１号 Tokyo, 〒1120004, JP)
TAMURA Katsumi (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
田村 克己 (〒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)
MINOSHIMA Toshikazu (Tsuchiura Works Hitachi Construction Machinery Co., Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
International Classes:
B60P1/16; F15B11/00; F15B11/04
Attorney, Agent or Firm:
HIROSE Kazuhiko (4F. HAP Nishishinjuku Bldg, 1-2 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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