Planetary Gear Unit

The planetary gear unit is composed of three sets of planetary gears, three clutches which transmit power to the planetary gears, and four brakes and three one-way clutches which immobilize the planetary carrier and planetary sun gear.

Power from the engine transmitted the input shaft via the torque converter is then transmitted to the planetary gears by the operation of the clutches. By operation of the brakes and one-way clutches, either the planetary earner or the planetary sun gear is immobilized, altering the speed of revolution of the planetary gear unit. Shift change is carried out by altering the combination of clutch and brake operation.

Each clutch and brake operates by hydraulic pressure; gear position is decided according to the throttle opening angle and vehicle speed, and shift change automatically occurs.

O/O Direct 2nd Coast Brake <B,) Forward Clutch Clutch <C0) \ (C,)

1st & Reverse Brake (B3>

Rear Planetary Carrier

Rear Planetary Ring Gear

0/0 Input Shaft

0/0 One-Way Clutch CF0>

O/O Direct 2nd Coast Brake <B,) Forward Clutch Clutch <C0) \ (C,)

1st & Reverse Brake (B3>

Rear Planetary Carrier

Rear Planetary Ring Gear

0/0 Input Shaft

0/0 One-Way Clutch CF0>

Output Shaft

Front & Rear Planetary Sun Gear

Input Shaft

Front Planetary Ring Gear

No. 2 One-Way Clutch <F2) No. 1 One-Way Clutch (F,)

0/0 Planetary Ring Gear 0/D Planetary Carrier 0/0 Planetary Sun Gear

Front & Rear Planetary Sun Gear

Output Shaft

Input Shaft

Front Planetary Ring Gear

No. 2 One-Way Clutch <F2) No. 1 One-Way Clutch (F,)

ATJ1$7

OPERATION OF EACH ELEMENT

NOMENCLATURE

OPERATION

0/0 Direct Clutch (C0)

Connects overdrive sun gear and overdrive carrier

0/0 Brake (80)

Prevents overdrive sun gear from turning either clockwise or counterclockwise

0/0 One-Way Clutch (F0)

When transmission is being driven by engine, connects overdrive sun gear and overdrive carrier

Forward Clutch (C| )

Connects input shaft and front planetary ring gear

Direct Clutch <C2)

Connects input shaft and front & rear planetary sun gear

2nd Coast Brake (B, )

Prevents front & rear planetary sun gear from turning either clockwise or counterclockwise

2nd Brake <B2)

Prevents outer race of F, from turning either clockwise or counterclockwise, thus preventing front & rear planetary sun gear from turning counterclockwise

1st & Reverse Brake (831

Prevents rear planetary carrier from turning either clockwise or counterclockwise

No. 1 One-Way Clutch (F,)

When B2 is operating, prevents front & rear planetary sun gear from turning counterclockwise

No. 2 One Way Clutch (Fj)

Prevents rear planetary carrier from turning counterclockwise

OPERATING CONDITIONS FOR EACH GEAR (See page AT-12)

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