DRUM ROTATION DEVICE FOR CONSTRUCTION MACHINE

摘要

A support member (12) fixed to a track frame (3) is constructed from a circular tube section (12A) and a lid section (12D), and two dry-type electromagnetic brakes (30) are provided in a brake receiving section (12F) of the circular tube section (12A). Also, an electric motor (14) is installed on the support member (12). Further, a drum (15) is rotatably installed via a bearing (19) on the outer periphery of the support member (12), and a planetary gear reduction mechanism (21) is received in the drum (15). The gap between the support member (12) and the drum (15) is sealed by a floating seal (44), and the gap between a shaft insertion hole (12E) of the support member (12) and a connection shaft (26) is sealed by a seal ring (45). By this, the two dry-type electromagnetic brakes (30) can be received in the support member (12) in a manner isolated from lubrication oil (22).