Title:
HYDRAULIC DRIVE DEVICE FOR LARGE HYDRAULIC EXCAVATOR
Document Type and Number:
WIPO Patent Application WO/2008/018538
Kind Code:
A1
Abstract:
[PROBLEMS] A large size hydraulic excavator that can be easily changed from a
state corresponding to a backhoe shovel to a state corresponding to a loader shovel,
and vice versa. [MEANS FOR SOLVING PROBLEMS] A hydraulic drive device having
a hydraulic circuit (1) provided with hydraulic pumps (11-18) and directional control
valves (21-35), solenoid valves (41-43, 51-66) for controlling the hydraulic
pumps (11-18) and the directional control valves (21-35), and a controller (70)
for controlling the solenoid valves (41-43, 51-66) according to operation of
operation lever devices (80-83) and operation pedal devices (84-87). The controller
(70) controls the solenoid valves (41-43, 51-66) in a backhoe mode or a loader
mode that is selectively commanded by mode command means (71). Controlling the
solenoid valves (41-43, 51-66) in the backhoe mode causes the hydraulic circuit (1)
to function as a hydraulic drive circuit for backhoe, and controlling the solenoid
valves (41-43, 51-66) in the loader mode causes the hydraulic circuit (1) to function
as a hydraulic drive circuit for loader mode.
Inventors:
KAKIZAWA, Kenji (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumach, Tsuchiura-shi Ibaraki 13, 3000013, JP)
柿澤 健二 (〒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)
柿澤 健二 (〒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:
JP2007/065601
Publication Date:
February 14, 2008
Filing Date:
August 09, 2007
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)
KAKIZAWA, Kenji (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumach, Tsuchiura-shi 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)
KAKIZAWA, Kenji (Hitachi Construction Machinery Co. Ltd., Tsuchiura Works, 650, Kandatsumach, Tsuchiura-shi Ibaraki 13, 3000013, JP)
International Classes:
E02F9/22; E02F3/43; F15B11/17; E02F9/22; E02F3/42; F15B11/00
Attorney, Agent or Firm:
The Patent Body Corporate TAKEWA INTERNATIONAL PATENT OFFICE (Kashiwaya Bldg, 6-13Nishishinbashi 1-chome,Minato-k, Tokyo 03, 1050003, JP)
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