Title:
HYDRAULIC WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2011/093378
Kind Code:
A1
Abstract:
Disclosed is a hydraulic work machine having a travel speed control device and a booster control device and capable of reducing the number of components in said travel speed control device and a booster control device. A hydraulic shovel is provided with: a travel speed control device, which including a hydraulic work oil supply means for travel capable of supplying hydraulic work oil for operating a tilt angle control device (21, 22) for travel which controls the tilt angle of a travel motor (15, 16); a booster control device, which includes a hydraulic work oil supply means for boosting capable of supplying hydraulic pressure for operating an adjustable relief valve (23) capable of changing the set relief pressure; and a single hydraulic work oil supply means which is used both as the hydraulic work oil supply means for travel and the hydraulic work oil supply means for boosting. Said hydraulic work oil supply means is provided with: pipelines (30, 31) communicating with both the tilt angle control device (21, 22) for travel and the adjustable relief valve (23); a solenoid valve (32) which opens and closes said pipelines (30, 31); and a controller (35) for outputting a control signal for controlling the solenoid valve (32).
Inventors:
KARASAWA Hideo (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
柄澤 英男 (〒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)
ARIGA Nobuei (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
柄澤 英男 (〒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)
ARIGA Nobuei (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2011/051595
Publication Date:
August 04, 2011
Filing Date:
January 27, 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)
KARASAWA Hideo (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
柄澤 英男 (〒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)
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)
KARASAWA Hideo (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
柄澤 英男 (〒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)
International Classes:
E02F9/22; F15B11/028; F15B11/04
Attorney, Agent or Firm:
The Patent Body Corporate TAKEWA INTERNATIONAL PATENT OFFICE (Kashiwaya Bldg, 6-13 Nishishinbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
Download PDF:
Claims: