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1. (WO2006126646) HYDRAULIC DRIVE DEVICE

Pub. No.:    WO/2006/126646    International Application No.:    PCT/JP2006/310476
Publication Date: Nov 30, 2006 International Filing Date: May 25, 2006
IPC: F16H 47/02
Applicants: Hitachi Construction Machinery Co., Ltd.
日立建機株式会社
YABUUCHI, Yoshitomo
藪内 愛智
SUGIYAMA, Genroku
杉山 玄六
KOBAYASHI, Takeshi
小林 剛
NIIDOME, Takashi
新留 隆志
KURIHARA, Takeshi
栗原 猛
Inventors: YABUUCHI, Yoshitomo
藪内 愛智
SUGIYAMA, Genroku
杉山 玄六
KOBAYASHI, Takeshi
小林 剛
NIIDOME, Takashi
新留 隆志
KURIHARA, Takeshi
栗原 猛
Title: HYDRAULIC DRIVE DEVICE
Abstract:
A hydraulic drive device, comprising a front casing (50) formed of a member in which the rotating members of a hydraulic motor (30) including a cylinder block (30A) and a part of an output shaft (36) and the rotating members of a hydraulic motor (31) including a cylinder block (31A) and a part of an output shaft (32) are stored and a rear casing (51) joined to the front casing (50) and in which a valve plate (30C) and a valve plate (31C) are installed. The rear casing (51) comprises an oil passage (52) communicating with the first port (30C1) of the valve plate (30C), an oil passage (53) communicating with the oil passage (52) and the first port (31C1) of the valve plate (31C), an oil passage (54) communicating with the second port (30C2) of the valve plate (30C), and an oil passage (55) communicating with the oil passage (54) and the second port (31C2) of the valve plate (31C).