SWING DEVICE FOR CONSTRUCTION MACHINERY

摘要

An electric motor (21) is arranged on a reduction device (12), and a wet braking device (30) which gives braking force to a motor shaft (25) is arranged on an upper end side of the electric motor (21). The wet braking device (30) comprises: a brake case (31) which accommodates an upper end portion of the motor shaft (25); an adapter (36) which is detachably disposed to the motor shaft (25) in the brake case (31); a plurality of rotating side brake disks (39) and a plurality of non-rotating side brake disks (40) arranged on an outer peripheral side of the adapter (36); and a brake piston (41) which gives braking force to the motor shaft (25) by frictionally engaging the rotating side brake disks (39) and the non-rotating side brake disks (40) with each other. As a result, at the time of performing a maintenance operation for the wet braking device (30), the wet braking device (30) alone can be solely removed while keeping the electric motor (21) assembled to the reduction device (12).