3HP 12 · 3HP 22 | |
Production: | 1963–1975 · 1973–1990 |
Model Years: | 1963–1975 · 1973–1990 |
Manufacturer: | ZF Friedrichshafen |
Class: | 3-Speed Automatic Transmission for Longitudinal and Transverse Engines |
Successor: | ZF 4HP transmission Family |
The 3HP is a three-speed Automatic transmission family with a hydrodynamic Torque converter with hydraulic control for passenger cars from ZF Friedrichshafen AG. In selector level position "P", the output is locked mechanically. The Ravigneaux planetary gearset types were first introduced in 1963 and produced through the mid seventies. The Simpson planetary gearset types were launched in 1973 and produced through 1990. Both were used in different versions in a large number of cars.
The 3HP 12 was produced through the mid-seventies and has been used in a variety of cars. There are versions for longitudinal and transverse engines.
Gear Teeth and Ratios | Planetary Gearset Teeth Ravigneaux | Count | Total | Avg. | |||
---|---|---|---|---|---|---|---|
Model | Version First Delivery | {S1} {R1} | {S2} {R2} | Brakes Clutches | Ratio Span | Gear Step | |
Gear n | R | 1 | 2 | 3 | |||
Step in-1/in | - R : 1 | 1 : 2 | 2 : 3 | ||||
3HP 12[1] Small Engines | 1963 | 25 32 | 32 64 | 3 2 | |||
Ratio in | -\tfrac{2}{1} | \tfrac{64}{25} | \tfrac{38}{25} | \tfrac{1}{1} | |||
Step | 0.7813 | 1.6842 | 1.5200 | ||||
3HP 12 Big Engines | 160Nm 1963 | 28 32 | 32 64 | 3 2 | |||
Ratio in | -\tfrac{2}{1} | \tfrac{16}{7} | \tfrac{10}{7} | \tfrac{1}{1} | |||
Step | 0.8750 | 1.6000 | 1.4286 | ||||
Ratio | -\tfrac{R2}{S2} | \tfrac{R1R2}{S1S2} | \tfrac{R2(S1+R1)}{S1(S2+R2)} | \tfrac{1}{1} |
The all new 3HP 22 was introduced in 1973 and was produced through 1990 and has been used in a variety of cars from Alfa Romeo, BMW,[2] Citroën, Peugeot, and Fiat.[3]
Weight | 45kg (99lb) with converter | |
---|---|---|
Control | mechanical · hydraulic |
Gear Teeth and Ratios | PlanetaryGearset Teeth Simpson | Count | Total | Avg. | |||
---|---|---|---|---|---|---|---|
Model Type | Version First Delivery | S1 R1 | S2 R2 | Brakes Clutches | Ratio Span | Gear Step | |
Gear n | R | 1 | 2 | 3 | |||
Step in-1/in | - R : 1 | 1 : 2 | 2 : 3 | ||||
3HP 22 Big Engines | 320Nm 1973 | 35 73 | 35 73 | 3 2 | |||
Ratio in | -\tfrac{73}{35} | \tfrac{181}{73} | \tfrac{108}{73} | \tfrac{1}{1} | |||
Step | 0.8412 | 1.6759 | 1.4795 | ||||
3HP 22 Small Engines | 1973 | 35 73 | 41 73 | 3 2 | |||
Ratio in | -\tfrac{73}{35} | \tfrac{6,983}{2,555} | \tfrac{114}{73} | \tfrac{1}{1} | |||
Step | 0.7631 | 1.7501 | 1.5616 | ||||
3HP 22 Porsche 944 | 1981 | 28 68 | 32 64 | 3 2 | |||
Ratio in | -\tfrac{17}{7} | \tfrac{19}{7} | \tfrac{3}{2} | \tfrac{1}{1} | |||
Step | 0.8947 | 1.8095 | 1.5000 | ||||
Ratio | -\tfrac{R1}{S1} | \tfrac{S1(S2+R2)+R1S2}{S1R2} | \tfrac{S2+R2}{R2} | \tfrac{1}{1} |