POWERFLOW Components
| 1- A CLUTCH |
| 2 - B CLUTCH |
| 3 - P1 ANNULUS (PARTIAL CUTAWAY) |
| 4 - P2 ANNULUS |
| 5 - P3 SUN GEAR |
| 6 - P3 CARRIER |
| 7 - D CLUTCH DRUM (PARTIAL CUTAWAY) |
| 8 - P4 ANNULUS DRUM (PARTIAL CUTAWAY) |
| 9 - P4 ANNULUS (PARTIAL CUTAWAY) |
| 10 - P4 SUN GEAR/D CLUTCH RETAINER (PARTIAL CUTAWAY) |
| 11 - P4 CARRIER |
| 12 - D CLUTCH |
| 13 - C CLUTCH |
| 14 - E CLUTCH |
| 15 - P3 ANNULUS |
| 16 - P2 CARRIER |
| 17 - P1/P2 SUN GEAR |
| 18 - P1 CARRIER |
| 19 - INPUT SHAFT |
Use this POWER FLOW COMPONENTS graphic and chart to identify the individual components of the specific gear powerflow explanations below:
FIRST GEAR POWERFLOW
Clutch A (1) holds the P1/P2 sun gear (17) and clutch B (2) holds the P1 annulus (3). Because two members of the same gear set are held, the entire P1 gear set is stationary. The stationary P1 carrier (18) is connected to the P4 annulus (9), locking the annulus. The input shaft (19) drives the C clutch (13), and the C clutch (13) drives the P4 sun gear (10). The P4 sun gear (10) drives the P4 carrier (11), whose pinions walk around the held P4 annulus (9).
SECOND GEAR POWERFLOW
Clutch A (1) holds the P1/P2 sun gear (17) and clutch B (2) holds the P1 annulus (3). As with 1st gear, the entire P1 gear set is stationary. The stationary P1 carrier (18) is connected to the P4 annulus (9), locking the annulus. The input shaft (19) drives the P2 carrier (16). The P2 carrier (16) drives the P2 annulus (4). The P2 annulus (4) drives the E clutch (14) through the P3 sun gear (5) connection. The E clutch (14) then drives the P4 sun gear (10). The P4 sun gear (10) drives the P4 carrier (11), whose pinions walk around the held P4 annulus (9).
THIRD GEAR POWERFLOW
Clutch B (2) holds the P1 (3) annulus. The input shaft (19) drives the C clutch (12), which drives the P4 annulus (9). The C clutch (12) also drives the E clutch (14), which drives the P2 annulus (4). Because the P2 carrier (16) and the P2 annulus (4) are both driven at input shaft speed, the P2 gear set is locked at input shaft speed. The P1/P2 sun gear (17) drives the P1 carrier (18), and the P1 carrier drives the P4 annulus (9).
FOURTH GEAR POWERFLOW
Clutch B (2) holds the P1 annulus (3). With the E (14) and D (12) clutches applied, all components of the P3 and P4 gear sets are locked together to rotate at the same speed. The input shaft (19) drives the P2 carrier (16) which drives the P1/P2 sun gear (17). The P1/P2 sun gear drives the P1 carrier (18). The P1 carrier drives the P4 gear set through the P4 annulus (9).
FIFTH GEAR POWERFLOW
Clutch B (2) holds the P1 annulus (3). The input shaft (19) always drives the P2 carrier (16). Because the C clutch (13) is applied, the P3 annulus (15) and P4 sun gear (10) are also driven at input shaft speed. The D clutch (12) is applied to connect the P3 carrier (6) with the P4 carrier (11). The P2 carrier (16) drives the P1/P2 sun gear (17), which drives the P1 carrier (18). The P1 carrier walks around the held P1 annulus (3) and drives the P4 annulus (9). Gear reduction is achieved between the P4 sun gear (10) rotating at input shaft speed and the P4 annulus (9) rotating at a reduced speed.
SIXTH GEAR POWERFLOW
Clutch C (13) drives the P3 annulus (15) at input shaft speed and E clutch (14) drives the P3 sun gear (5) at input shaft speed. Because two components of the same gear set are driven at the same speed, the entire gear set is locked in rotation. The D clutch (12) connects the P3 carrier (6) to the P4 carrier (11) and the output shaft.
SEVENTH GEAR POWERFLOW
Clutch A (1) holds the P1/P2 sun gear (17) stationary. The input shaft drives the P2 carrier which drives the P2 annulus, increasing the speed of the P3 sun gear (5) and creating overdrive. The C clutch (13) drives the P3 annulus (15) at input shaft speed. The P3 sun gear (5) spins at a faster speed than the P3 annulus (15) and the P3 carrier (6) is the output of the gear set. This results in a reduction that offsets the overdrive of the P2 gear set. The D clutch (12) connects the P3 carrier (6) to the P4 carrier (11) and the output shaft.
EIGHTH GEAR POWERFLOW
Clutch A (1) holds the P1/P2 sun gear (17) stationary. As with 7th gear, the P2 gear set creates an overdrive ratio. However, the E clutch (14) is now applied, which locks together the P3 gear set and eliminates any torque multiplication from the P3 gear set. The overdrive created by P2 is transferred by the D clutch (7) to the output shaft.
REVERSE GEAR POWERFLOW
Clutches A (1) and B (2) hold the P1 gear set to hold the P1/P2 sun gear (17). The input shaft drives the P2 carrier, which produces an overdrive ratio from the P2 gear set, driving the P3 sun gear (5) in engine direction. The P3 carrier (6) is connected to the output shaft by the D clutch (12). This holds the carrier, reversing the direction and multiplying torque. The P3 annulus (15) is connected to the P4 sun gear (10), which drives the P4 gear set opposite of engine direction and multiplies torque again.