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| Illustration 1 | g00548106 |
The swing drive is driven by the swing motor. The swing drive functions in order to rotate the upper structure.
The swing drive is made up of the following components: top mounted swing motor, spring controlled multiple disc brake, two planetary gear stages and output shaft with swing drive pinion. The swing motor operates in a closed control circuit for fixed displacement.
The multiple disc brake is hydraulically released. The swing brake is spring fitted to the swing gear in order to protect the upper structure against rotation during operation. When the swing brake is activated, the swing solenoid valves open in order to release the hydraulic pressure that is holding the brake piston away from the multiple disc pack. The spring force overcomes the hydraulic pressure and the swing brake is engaged.
The swing motor sends a torque to the two planetary gear stages in the swing drive. The two planetary gear stages transmit a torque rise to the swing gear. The torque output from the swing gear is transmitted through the swing drive to the ring gear and the bearing.