Caterpillar Sarl

Dharmesh Kumar

Takeshi Nakamura

Akito Nakai

Takeshi Tsuneyoshi

Takahiro Iwamoto

Kentaro Nakayama

Koichi Andatsu

The present invention aims to improve the strength of the portion of the swing frame for attaching the swing motor apparatus while reducing cost. A bottom plate of a swing frame is divided into a center bottom plate segment to which the swing motor apparatus mounting portion is attached, a front bottom plate segment that is positioned to the front side of the center bottom plate segment and to which the center joint mounting portion is attached, and a rear bottom plate segment positioned to the rear side of the center bottom plate segment, wherein: the center, front, and rear bottom plate segments and are formed integrally by welding; and the plate thickness of the center bottom plate segment is thicker than the plate thickness of the front bottom plate segment and the rear bottom plate segment.

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Akashi, Japan

Dharmesh Kumar