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Patent Searching and Data


Title:
CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/151323
Kind Code:
A1
Abstract:
The present invention suppresses the occurrence of jerking in a construction machine provided with a hydraulic pilot type hydraulic control device. A hydraulic shovel 1 provided with hydraulic pumps 51L, 51R, traveling motors 22L, 22R, traveling operation levers 34L, 34R, a pilot pump 54, hydraulic pilot valves 55La, 55Lb, 55Ra, 55Rb, and direction control valves 53L, 53R, has: changeover switches 35L, 35R for switching an operation mode of the traveling operation levers 34L, 34R; pilot pressure adjustment devices 5L, 5R that adjust pilot pressure applied to the direction control valves 53L, 53R; and pilot pressure detectors 56La, 56Lb, 56Ra, 56Rb, wherein the pilot pressure adjustment devices apply pilot pressure to the direction control valves 53L, 53R at the point of time when the operation mode of the traveling operation levers 34L, 34R is switched to a control mode.

Inventors:
ITOU Daiki (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
NARAZAKI Akihiro (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
KODAKA Katsuaki (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2018/006055
Publication Date:
August 23, 2018
Filing Date:
February 20, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F15B11/08; E02F9/20
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (UNIZO Nishishimbashi 3-chome Bldg, 13-3 Nishishimbashi 3-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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