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Patent Searching and Data


Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/049327
Kind Code:
A1
Abstract:
According to the present invention, a first torque control proportional electromagnetic valve (37) is connected to a third pressure-receiving chamber (32D) of a first torque control regulator (32) via a first torque control pipeline (41). A second torque control proportional electromagnetic valve (38) is connected to a third pressure-receiving chamber (35D) of a second torque control regulator (35) via a second torque control pipeline (42). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller (47). A switching valve (48) is provided between the first torque control pipeline (41) and the second torque control pipeline (42). When driving left and right traveling hydraulic motors (2B, 2C), the switching valve (48) supplies the output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure-receiving chamber (35D) of the second torque control regulator (35).

Inventors:
TAKAHASHI Kiwamu (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
ISHIKAWA Kouji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
TSURUGA Yasutaka (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
HOSHINO Masatoshi (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
HIJIKATA Seiji (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2017/032536
Publication Date:
March 14, 2019
Filing Date:
September 08, 2017
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:
F15B11/22; B62D11/04; E02F9/22; F15B11/02
Foreign References:
JP2010078047A2010-04-08
JP2009299288A2009-12-24
JPH11132202A1999-05-18
JPH10159807A1998-06-16
JP2011157790A2011-08-18
Attorney, Agent or Firm:
HIROWA PATENT FIRM (4F. Nishishinjuku Koide Bldg, 1-3 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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