| |
| Illustration 1 | g06188181 |
|
View of the transmission planetary for model 785G | |
| |
| Illustration 2 | g01781180 |
|
Components of the transmission (1) Input shaft (2) Rotating housing (3) Sun gear (4) Planetary gears (5) Clutch number 1 (6) Clutch number 2 (7) Center shaft (8) Rotating housing of clutch number 3 (9) Clutch number 3 (10) Sun gear (11) Ring gear (12) Clutch number 4 (13) Ring gear (14) Clutch number 5 (15) Sun gear (16) Clutch number 6 (17) Hub (18) Sun gear (19) Planetary carrier (20) Planetary carrier and output shaft (21) Planetary gears (22) Ring gear (23) Planetary gears (24) Planetary gears (25) Planetary carrier (26) Coupling hub (27) Coupling ring gear (28) Ring gear (29) Planetary carrier | |
| Engagement Of Transmission Clutches | |
| Transmission Speed | Engaged Clutches in the Transmission |
| NEUTRAL 1 | 3 |
| NEUTRAL 2 | 3 |
| REVERSE | 1 and 6 |
| FIRST FORWARD | 1 and 5 |
| SECOND FORWARD | 2 and 5 |
| THIRD FORWARD | 1 and 4 |
| FOURTH FORWARD | 2 and 4 |
| FIFTH FORWARD | 1 and 3 |
| SIXTH FORWARD | 2 and 3 |
Power from the engine goes to the torque converter. The power is then transferred through the drive shaft to the transfer gears. The transfer gears are fastened directly to the front of the transmission case. The power then goes through the transmission to the differential.
The transmission has six forward speeds and one reverse speed. NEUTRAL results in the "Number 3" clutch being engaged. At lower ground speeds, FIRST speed uses the torque converter drive. At higher ground speeds, FIRST speed uses direct drive. As the ground speed increases in FIRST speed, the lockup clutch of the torque converter engages. Engaging the lockup clutch on the torque converter provides FIRST speed with direct drive. The speeds SECOND through SIXTH uses direct drive. But, there is a short period of torque converter drive when the clutches engage in the transmission. The short period provides smooth, automatic upshifting from SECOND through SIXTH and smooth, automatic downshifting from SIXTH through SECOND.
The transmission has a combination of three rotating clutches, three stationary clutches, and four planetary units. This arrangement provides six forward speeds and one reverse speed. Clutch number 1 (5), clutch number 2 (6), and clutch number 3 (9) are the rotating clutches.
Input torque goes from the transfer gears to input shaft (1). Input shaft (1) drives the rotating housing and the transmission input arrangement. Center shaft (7) connects the input section to the output section. Center shaft (7) also carries the sun gears that drive the output section of the transmission. Center shaft (7) and input shaft (1) turn the same direction.
| |
| Illustration 3 | g01781235 |
|
Power flow in NEUTRAL (1) Input shaft (2) Rotating housing (3) Sun gear (4) Planetary gears (5) Clutch number 1 (6) Clutch number 2 (7) Center shaft (8) Rotating housing of clutch number 3 (9) Clutch number 3 (10) Sun gear (11) Ring gear (12) Clutch number 4 (13) Ring gear (14) Clutch number 5 (15) Sun gear (16) Clutch number 6 (17) Hub (18) Sun gear (19) Planetary carrier (20) Planetary carrier and output shaft (21) Planetary gears (22) Ring gear (23) Planetary gears (24) Planetary gears (25) Planetary carrier (26) Coupling hub (27) Coupling ring gear (28) Ring gear (29) Planetary carrier | |
Clutch number 1 (5) and clutch number 5 (14) are engaged in FIRST speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 1 (5). Because clutch number 1 (5) is engaged, the discs of the clutch number 1 hold ring gear (28).
Ring gear (28) turns with rotating housing (2) and input shaft (1). Sun gear (3) is splined to a stationary shaft. Sun gear (3) does not turn. Planetary gears (4) move around the outside of sun gear (3). This drives planetary carrier (29). Planetary carrier (29) turns in the same direction as input shaft (1), but at a different speed. Planetary carrier (29) is splined to center shaft (7). Center shaft (7) and planetary carrier (29) are driven in the same direction and at the same speed.
| |
| Illustration 4 | g01781254 |
|
Power flow in FOURTH speed (1) Input shaft (2) Rotating housing (3) Sun gear (4) Planetary gears (5) Clutch number 1 (6) Clutch number 2 (7) Center shaft (8) Rotating housing of clutch number 3 (9) Clutch number 3 (10) Sun gear (11) Ring gear (12) Clutch number 4 (13) Ring gear (14) Clutch number 5 (15) Sun gear (16) Clutch number 6 (17) Hub (18) Sun gear (19) Planetary carrier (20) Planetary carrier and output shaft (21) Planetary gears (22) Ring gear (23) Planetary gears (24) Planetary gears (25) Planetary carrier (26) Coupling hub (27) Coupling ring gear (28) Ring gear (29) Planetary carrier | |
Clutch number 2 (6) and clutch number 5 (14) are engaged in SECOND speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 2 (6). Because clutch number 2 (6) is engaged, the discs of the clutch number 2 hold coupling ring gear (27).
Coupling ring gear (27) turns with rotating housing (2) and input shaft (1). Coupling ring gear (27) is splined to planetary carrier (29). Planetary carrier (29) turns with coupling ring gear (27). The planetary carrier is splined to center shaft (7). Center shaft (7) and input shaft (1) are driven in the same direction and at the same speed.
Sun gear (15) is splined to center shaft (7). Sun gear (15) turns planetary gears (23). Clutch number 5 (14) is engaged. The discs of clutch number 5 (14) hold ring gear (13) stationary. Planetary gears (23) move around theinside thering gear (13). The movement of planetary gears (23) drives the planetary carrier and output shaft (20).
The output shaft turns in the same direction as input shaft (1), but at a different speed.
Clutch number 1 (5) and clutch number 4 (12) are engaged in third speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 1 (5). Because clutch number 1 (5) is engaged, the discs of the clutch number 2 hold coupling ring gear (28).
Ring gear (28) turns with rotating housing (2) and input shaft (1). Sun gear (3) is splined to a stationary shaft. Sun gear (3) does not turn. Planetary gears (4) move around the outside of sun gear (3). This drives planetary carrier (29). Planetary carrier (29) turns in the same direction as input shaft (1), but at a different speed. Planetary carrier (29) is splined to center shaft (7). Center shaft (7) and planetary carrier (29) are driven in the same direction and at the same speed.
Sun gear (10) is splined to center shaft (7). Sun gear (10) turns planetary gears (24). Clutch number 4 (12) is engaged. The discs of clutch number 4 (12) hold ring gear (11) stationary. Planetary gears (24) move around theinside thering gear (11). This drives planetary carrier (25) in the same direction as center shaft (7), but at a different speed.
Planetary carrier (25) is splined to ring gear (13). Because clutch number 5 (14) is not engaged, ring gear (13) turns with planetary carrier (25). Sun gear (15) is splined to center shaft (7). Sun gear (15) turns with center shaft (7). Sun gear (15) and ring gear (13) turn in the same direction but at different speeds. Planetary gears (23) move around the inside the ring gear (13). The movement of planetary gears (23) drives the planetary carrier and output shaft (20).
The output shaft turns in the same direction as input shaft (1), but at a different speed.
Clutch number 2 (6) and clutch number 4 (12) are engaged in FOURTH speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 2 (6). Because clutch number 2 (6) is engaged, the discs of the clutch number 2 hold coupling ring gear (27).
Coupling ring gear (27) turns with rotating housing (2) and input shaft (1). Coupling ring gear (27) is splined to planetary carrier (29). Planetary carrier (29) turns with coupling ring gear (27). The planetary carrier is splined to center shaft (7). Center shaft (7) and input shaft (1) are driven in the same direction and at the same speed.
Sun gear (10) is splined to center shaft (7). Sun gear (10) turns planetary gears (24). Clutch number 4 (12) is engaged. The discs of clutch number 4 (12) hold ring gear (11) stationary. Planetary gears (24) move around the inside the ring gear (11). This drives planetary carrier (25) in the same direction as center shaft (7), but at a different speed.
Planetary carrier (25) is splined to ring gear (13). Because clutch number 5 (14) is not engaged, ring gear (13) turns with planetary carrier (25). Sun gear (15) is splined to center shaft (7). Sun gear (15) turns with center shaft (7). Sun gear (15) and ring gear (13) turn in the same direction but at different speeds. Planetary gears (23) move around the inside the ring gear (13). The movement of planetary gears (23) drives the planetary carrier and output shaft (20).
The output shaft turns in the same direction as input shaft (1), but at a different speed.
Clutch number 1 (5) and clutch number 3 (9) are engaged in FIFTH speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 1 (5). Because clutch number 1 (5) is engaged, the discs of clutch number 1 hold ring gear (28).
Ring gear (28) turns with rotating housing (2) and input shaft (1). Sun gear (3) is splined to a stationary shaft. Sun gear (3) does not turn. Planetary gears (4) move around the outside of sun gear (3). This drives planetary carrier (29). Planetary carrier (29) turns in the same direction as input shaft (1), but at a different speed. Planetary carrier (29) is splined to center shaft (7). Center shaft (7) and planetary carrier (29) are driven in the same direction and at the same speed.
Sun gear (10) is splined to center shaft (7). Sun gear (10) is also splined to coupling hub (26). Clutch number 3 (9) is engaged. The discs of clutch number 3 (9) hold coupling hub (26). Clutch number 3 (9) is a rotating . Rotating housing (8) of the clutch number 3 and center shaft (7) turn in the same direction and at the same speed. Rotating housing (8) of the clutch number 3 is fastened to planetary carrier (25). Planetary carrier (25) is splined to ring gear (13). Ring gear (13) and center shaft (7) turn in the same direction and at the same speed.
Sun gear (15) is splined to center shaft (7). Sun gear (15) and ring gear (13) turn in the same direction and at the same speed. This holds planetary gears (23). The planetary carrier and output shaft (20) are driven in the same direction as center shaft (7) and at the same speed as center shaft (7).
Clutch number 2 (6) and clutch number 3 (9) are engaged in SIXTH speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 2 (6). Because clutch number 2 (6) is engaged, the discs of the clutch number 2 hold coupling ring gear (27).
Coupling ring gear (27) turns with rotating housing (2) and input shaft (1). Coupling ring gear (27) is splined to planetary carrier (29). Planetary carrier (29) turns with coupling ring gear (27). The planetary carrier is splined to center shaft (7). Center shaft (7) and input shaft (1) are driven in the same direction and at the same speed.
Sun gear (10) is splined to center shaft (7). Sun gear (10) is also splined to coupling hub (26). Clutch number 3 (9) is engaged. The discs of clutch number 3 (9) hold coupling hub (26). Clutch number 3 (9) is a rotating . Rotating housing (8) of the clutch number 3 and center shaft (7) turn in the same direction and at the same speed. Rotating housing (8) of the clutch number 3 is fastened to planetary carrier (25). Planetary carrier (25) is splined to ring gear (13). Ring gear (13) and center shaft (7) turn in the same direction and at the same speed.
Sun gear (15) is splined to center shaft (7). Sun gear (15) and ring gear (13) turn in the same direction and at the same speed. This holds planetary gears (23). The planetary carrier and output shaft (20) are driven in the same direction as center shaft (7) and at the same speed as center shaft (7).
The output shaft turns in the same direction as input shaft (1) and at the same speed.
Clutch number 1 (5) and clutch number 6 (16) are engaged in REVERSE speed. Torque is transferred from the transfer gears to input shaft (1). Rotating housing (2) is splined to input shaft (1). Rotating housing (2) turns with input shaft (1). Rotating housing (2) spins the plates of clutch number 1 (5). Because clutch number 1 (5) is engaged, the discs of the clutch number 1 hold ring gear (28).
Ring gear (28) turns with rotating housing (2) and input shaft (1). Sun gear (3) is splined to a stationary shaft. Sun gear (3) does not turn. Planetary gears (4) move around the outside of sun gear (3). This drives planetary carrier (29). Planetary carrier (29) turns in the same direction as input shaft (1), but at a different speed. Planetary carrier (29) is splined to center shaft (7). Center shaft (7) and planetary carrier (29) are driven in the same direction and at the same speed.
Sun gear (15) is splined to center shaft (7). Sun gear (15) spins planetary gears (23). Clutch number 5 (14) is not engaged. Planetary gears (23) spin ring gear (13). Ring gear (13) turns in the opposite direction of sun gear (15). Hub (17) is splined to ring gear (13) and to sun gear (18). Sun gear (18) turns in the same direction as ring gear (13). Sun gear (18) turns planetary gears (21). Clutch number 6 (16) is engaged. The discs of clutch number 6 (16) hold ring gear (22). Planetary gears (21) move around the inside the ring gear (22). This drives planetary carrier (19). Planetary carrier (19) is splined to the planetary carrier and output shaft (20). The planetary carrier (19) is driven at the same speed and direction as the planetary carrier and output shaft (20).
The output shaft is driven in the opposite direction of center shaft (7) and input shaft (1) and at a different speed.