Mattingly & Malur, PC
Swing device for construction machine
A reduction gear is mounted on a revolving frame, and an electric motor having an electric motor shaft is disposed on the reduction gear. A hydraulic motor having a shaft is disposed on an upper side of the electric motor. A shaft insertion hole through which an upper end side of the electric motor shaft is inserted is provided in a lid portion of an electric motor casing. A male spline portion provided on the hydraulic motor shaft is spline-coupled to a female spline portion provided on the electric motor shaft. A bearing is provided between the shaft insertion hole and the electric motor shaft, and a pressure tight seal is provided by being located upwardly of the bearing. Hence, spline coupling portions of the female spline portion and the male spline portion are constantly lubricated by making use of drain oil which has leaked from the hydraulic motor.
HITACHI CONSTRUCTION MACHINERY CO., LTD.
E F E B E E E E
E02F F16H E02F B60L E02F E02F E02F E02F
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Kouji Nobuo Hidetoshi Mitsugu
Ishikawa Uzawa Satake Ojima