BEARING 8C9326 - Caterpillar

Illustration 1 g03387161
Final Drive
(1) Planetary carrier (first stage)
(2) Ring gear
(3) Planetary carrier (second stage)
(4) Planetary carrier (third stage)
(5) Sun gear (third stage)
(6) Seal
(7) Output shaft (travel motor)
(8) Sun gear (second stage)
(9) Sun gear (first stage)
(10) Planetary gear (first stage)
(11) Planetary gear (second stage)
(12) Planetary gear (third stage)
(13) Drive sprocket housing
(14) Roller bearings
(15) Motor housing
(16) Travel motor The final drive reduces the rotational speed of travel motor (16). Output shaft (7) of travel motor (16) is splined to sun gear (first stage) (9).The final drive consists of two groups. The first group consists of the three stages of the planetary gear reduction. The second group is the output group.
The first stage reduction group consists of the following components: sun gear (9), planetary gear (10), planetary carrier (1) and ring gear (2). The group for second stage reduction consists of the following components: sun gear (8), planetary gear (11), planetary carrier (3) and ring gear (2). The third stage reduction group consists of the following components: sun gear (5), planetary gear (12), planetary carrier (4) and ring gear (2).
The output group is described in the following manner. The rotation of drive sprocket housing (13) drives the track. Drive sprocket housing (13) and ring gear (2) are connected by bolts. The drive sprocket housing and the ring gear are supported by roller bearings (14).The planetary gears reduce the travel speed. The travel speed is reduced by the ratio of teeth of the sun gear and the ring gear. The compact final drive offers a greater reduction ratio when the sun gear is incorporated inside the ring gear.Operation
Sun gear (9) is splined to the output shaft of travel motor (7). The rotation of the output shaft is transmitted to the sun gear. When sun gear rotates clockwise, the final drive operates in the following manner.
Illustration 2 g03117019
First stage reduction group
(1) Planetary carrier (first stage)
(2) Ring gear
(9) Sun gear (first stage)
(10) Planetary gear (first stage) In the first stage reduction group, sun gear (9) causes planetary gears (10) to rotate counterclockwise. Planetary gears (10) mesh with sun gear (9) and ring gear (2). Planetary gears (10) rotate around sun gear (9) and the internal teeth of ring gear (2). Each planetary gear (10) is mounted