Gear Train

DESCRIPTION
The gear train consists of two sets of planetary gears, Tour sets of multi-plate clutches, one brake band, one Set of multi-plate brake and two sets of one-way clutches.

OPERATION
N Range
Because both the forward clutch and reverse clutch are the release positions, the power of the input shaft is not transmitted to the drive pinion or the rear drive shaft.

P Range
All controls do not operate, just as in the N range. The parking pawl interlocked with the selector lever meshes with the parking gear to mechanically hold the output shaft stationary, thus locking the power train.

First Speed Of D, 3 or 2 Range (D, 3, 2)






- When the throttle is open wide, as during acceleration in the low-speed range, the forward clutch, one-way clutch (3-4) and one-way clutch (1-2) operate to prevent the rear internal gear from turning in the reverse direction.
- While coasting, the rear internal gear turns normally and the one-way clutch (3-4) is released and idles. Therefore, no power is transmitted and the engine does not provide braking action.
- During deceleration, the overrunning clutch is applied and the one-way clutch (3-4) is prevented from idling; however, since the one-way clutch (1-2) is released and is idling, reverse power is not transmitted and engine braking is not performed.

Second Speed of D, 3 or 2 Range (D, 3, 2)






- During acceleration, the forward clutch is applied and connects the front planetary gear to the internal gear through the one-way clutch (3-4). Power is transmitted from the input shaft to the rear sun gear, turning the rear planetary carrier (i.e. front internal gear). Also, since the band brake is applied and the front sun gear is locked, the rear internal gear turns normally through the front planetary carrier and the forward clutch and one-way clutch (3-4) that are connected to that carrier. Thus, speed increases in proportion to the rotation of the rear internal gear compared with the first speed.
- Since the rear internal gear turns normally while coasting, the one-way clutch (3-4) is released and idles. Accordingly, reverse power is not transmitted to the engine and engine braking is not provided.
- During deceleration at "2" range, the overrunning clutch operates to check idling of the one-way clutch (3-4). Reverse power is transmitted to the engine, providing engine braking action.

Third Speed of D or 3 Range (D and 3)






- During acceleration, the high clutch is applied and the input shaft and front planetary carrier are connected. Further, the forward clutch and one-way clutch (3-4) operate to connect the front planetary carrier to the rear internal gear. Power is transmitted from the input shaft to the rear sun gear and rear internal gear. The rear sun gear and rear internal gear turn normally at the same speed. Therefore, the rear planetary carrier, rear sun gear and rear internal gear rotate normally as a unit.
- While coasting at "D", because the rear internal gee turns normally, the one-way clutch (3-4) idles in released state. Thus, reverse power is not transmitted to the engine and engine braking action is no provided.
- During deceleration at "3", "2" or "1st" range, the overrunning clutch is applied and checks the reverse rotation of the one-way clutch (3-4). Thus, reverse power is transmitted to the engine and engine braking is performed.

Fourth Speed (D) Of D Range






- During acceleration, the high clutch is applied and connects the input shaft to the front planetary carrier. Also, the forward clutch is applied, but it runs idle due to the one-way clutch (3-4) and takes no part in power transmission. Power is transmitted from the input shaft to the front planetary carrier by the function of the high clutch. When the front planetary carrier turns normally, because the front sun gear is held-stationary by the brake band, the speed of the front internal gear increases and is delivered to the meshing reduction drive shaft in normal rotation.
- While coasting, because power transmission does not go through the one-way clutch, reverse power is transmitted to the engine and engine braking is performed.

First Speed Of 1 Range






- During acceleration, the forward clutch and overrunning clutch are applied and the front planetary carrier and rear internal gear are connected. Also, the low reverse brake is applied so that the front planetary carrier and internal gear remain stationary. The power flow is the same as in the first speed of "D", "3" and "2" range (except for the following points) and engine braking is performed.
- The low reverse brake operates in place of the one-way clutch (1-2) and locks the rear internal get.
- In coasting and deceleration, low reverse brake and overrunning clutch are operating, so that reverse power is transmitted to the engine and engine braking action is provided.

R RANGE






The reverse clutch is applied and power is transmitted from the input shaft through the reverse clutch to the front sun gear. Also, the low reverse brake operates to lock the front planetary carrier. Therefore, when the front sun gear turns normally, the front internal gear slows and reverses.