SHAFT-DRIVE 8I6313 - Caterpillar

Illustration 1 g02162008
Swing drive
(1) First stage carrier
(2) First stage planetary gear
(3) Second stage carrier
(4) Ring gear
(5) Second stage planetary gear
(6) Roller bearing
(7) Roller bearing
(8) Pinion shaft
(11) First stage sun gear
(12) Second stage sun gear
(14) Housing
(15) Bearing gear (swing gear) The right swing drive and the left swing drive are identical in construction and operation. As a typical example, the description is given for the left swing drive.The swing drive consists of a series of planetary gears. The planetary gears reduce the rotational speed of the swing motor. The swing motor is bolted to the top of the swing drive. The swing drive is bolted to the upper structure. The teeth of the swing drive output pinion shaft (8) engage with bearing gear (15) of the swing bearing. The pinion shaft (8) rotates around bearing gear (15). This causes the machine to swing. Bearing gear (15) is attached to the lower structure.The swing drive is divided into the following two groups :
The first group is a double reducer of motor speed. The first stage reduction group consists of the following components : first stage sun gear (11), first stage planetary gear (2), ring gear (4) and first stage carrier (1). The second stage reduction consists of the following components : second stage sun gear (12), second stage planetary gear (5), ring gear (4) and second stage carrier (3).
The second group is the group for reduced output speed of the motor. The second group consists of the following components : roller bearing (6), roller bearing (7) and pinion shaft (8). The roller bearings are installed in housing (14) and the roller bearings support pinion shaft (8).The swing speed is reduced by a ratio of teeth on the sun gear to ring gear teeth by planetary reduction. Since the sun gear is inside of the ring gear, the swing drive is more compact than reduction units with external teeth.
Illustration 2 g02268295
Operation of the first stage planetary assembly
(1) First stage carrier
(2) First stage planetary gear
(4) Ring gear
(11) First stage sun gear
(16) Shaft (first stage planetary gear) The swing motor output shaft is splined to first stage sun gear (11). First