BRACKET AS 2881651 - Caterpillar

Combined Transmission and Steering Power Flow
Illustration 6 g00489740
Power flow schematic of the differential steering system for a gradual left turn
(3) Pinion gear for steering differential
(4) Ring gear
(7A) Sun gear
(7B) Sun gear
(8) Bevel gear
(9) Ring gear
(10) Housing
(11) Carrier
(17) Stationary ring gear
(22) Carrier
(24) Sun gear
(25) Pinion gear
(27) Outer axle shaft
(28) Inner axle shaft
(30) Outer axle shaft
(A) Direction of power flow for speed
(B) Direction of power flow for steering
(C) Direction of combined power flow Power from the steering motor and from the transmission can act together on the differential steering system. The power input from the transmission flows through the system normally. The power input from the steering motor goes through the system to one outer axle.The power to one axle is greater. The speed of that axle shaft increases. The other axle decreases speed.The amount of power to the axle shafts is controlled by the transmission. The speed of rotation of the axle shafts is controlled by the transmission.The difference in speed between the axle shafts is controlled by the steering motor. The rotation of the steering motor and pinion gear (3) controls the direction of turn. Refer to Table 1.The speed of the steering motor and of the pinion gear determines the rate of turn. A faster steering motor speed produces a sharper turn.
Table 1
Left Turn in Forward Left Turn in Reverse Right Turn in Forward Right Turn in Reverse
Rotation of Steering Motor and of Pinion Gear (3)(1) Clockwise Counterclockwise Counterclockwise Clockwise
Rotation of Pinion Gear (25) from the Transmission Clockwise Counterclockwise Clockwise Counterclockwise
Position of the Tiller Forward Back Back Forward
(1) The observed rotation from the drive end of the shaft
Illustration 7 g00489804
Rotation of the components during a gradual left turn and during forward movement
(3) Pinion gear
(4) Ring gear
(6) Planetary gears
(7A) Sun gear
(7B) Sun gear
(8) Bevel gear
(9) Ring gear
(10) Housing
(11) Carrier
(16) Planetary gears
(17) Stationary ring gear
(22) Carrier
(23) Planetary gears
(24) Sun gear
(25) Pinion gear
(26) Bevel gear
(27) Outer axle shaft
(28) Inner axle shaft
(29) Shaft for bevel gear
(30) Outer axle shaft
(31) Steering motor
(32) Transfer gear
(33) Sun gear of final drive
(34) Transfer gear
(35) Sun gear of final drive The machine turns gradually to the left.
Pinion gear (3) for steering and pinion gear (25) for speed rotate in the same direction. Power to pinion gear (3) is transferred through bevel gear (8) and through housing (10) to ring gear (9). Ring gear (9) sends the power through the planetary gears to sun gear (7A). Sun gear (7A) sends the power to center axle shaft (27). This power adds to the power to sun gear (7B).The combined power through inner axle shaft (28) is transferred to sun gear (24). Sun gear (24), the planetary gears, carrier (22), and stationary ring gear (17) multiply the power. This power is sent to outer axle shaft (27).Outer axle shaft (27) increases speed. Outer axle (30) decreases speed equally.The power to sun gear (7A) adds to the power to sun gear (7B). The increase in power increases the speed of the sun gears. When the speed of sun gear (7B) increases, the speed