BOOM ROTATION-TYPE WORKING MACHINE

摘要

PROBLEM TO BE SOLVED: To facilitate working of a motor mounting surface and increase working accuracy, under conditions that a motor for boom rotation is disposed on the rear side of a flange.

SOLUTION: A support flange 22 as a ring-shaped independent component exclusive to the mounting of a motor is bolted together with an inner ring of a bearing 9 on the front side of a front-side base flange 20 that is provided at a front end of a body section 8 of a boom supporting mechanism. A motor 16 is mounted on a rear surface of a motor mounting section 25 that is protrusively provided downward on the outer periphery of the support flange 22. In addition, the motor mounting section 25 is bolted in the state of overlapping a front surface of a flange coupling portion 23 of the base flange 20.

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