Vertical Electrically Driving Device With Brake And Work Machine

摘要

A brake unit of a rotating drive apparatus includes a piston arranged around a vertically extending rotation shaft body in a non-contact state actionably in the vertical direction, a fixed plate arranged below the piston, and a frictional plate arranged between the piston and the fixed plate rotatably together with the rotation shaft body as well as slidably along the rotation shaft body. The brake unit generates a brake torque by downwardly actuating the piston so as to press the friction plate onto the fixed plate with the piston and the brake unit cancels the braking by upwardly actuating the piston. The brake unit also includes coil springs raising the frictional plate during canceling the braking, to a position between the piston and the faxed plate in a non-contact state with either of them.