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AT-5
A340E(Others) AUTOMATIC TRANSMISSION - OPERATION
2. FUNCTION OF COMPONENTS
NOMENCLATURE | OPERATION
O/D Direct Clutch (C₀) | Connects overdrive sun gear and overdrive carrier
O/D Brake (B₀) | Prevents overdrive sun gear from turning either clockwise or counterclockwise
O/D One-Way Clutch (F₀) | When transmission is being driven by engine, connects overdrive sun gear and overdrive carrier
Forward Clutch (C₁) | Connects input shaft and front planetary ring gear
Direct Clutch (C₂) | Connects input shaft and front & rear planetary sun gear
2nd Coast Brake (B₁) | Prevents front & rear planetary sun gear from turning either clockwise or counterclockwise
2nd Brake (B₂) | Prevents outer race of F₁ from turning either clockwise or counterclockwise, thus preventing front & rear planetary sun gear from turning counterclockwise
1st & Reverse Brake (B₃) | Prevents rear planetary carrier from turning either clockwise or counterclockwise
No.1 One-Way Clutch (F₁) | When B₂ is operating, prevents front & rear planetary sun gear from turning counterclockwise
No.2 One-Way Clutch (F₂) | Prevents rear planetary carrier from turning counterclockwise
Intermediate Shaft
Front Planetary
Carrier
Rear Planetary Carrier
B₀
F₀
B₂ B₃ F₂
C₀
O/D Planetary Carrier
F₁
C₁
O/D Input
Shaft
C₂
O/D Sun Gear
Sun Gear
Output Shaft
Input Shaft
B₁
O/D Planetary Ring Gear
Front Planetary
Ring Gear
Rear Planetary
Ring Gear
Q02957
V02113