The 3HP is a 3-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.

Key data

+ Gear ratios Model Version FirstDeliv-ery Gear Total Span Avg.Step Components Nomenclature R 1 2 3 Nomi-nal Effec-tive Cen-ter Total perGear GearsCount Cou-pling Gear-sets Input ShaftDiameter Ravigneaux types 3 H P 3HP 12 Small Engines 1963 2 Gearsets3 Brakes2 Clutches 12 mm 3HP 12 Large Engines Simpson types 3HP 22 Large Engines 1973 2 Gearsets3 Brakes2 Clutches 22 mm 3HP 22 Small Engines 3HP 22 Porsche 944 1981

1963: 3HP 12— Ravigneaux planetary gearset types —

History

The Ravigneaux planetary gearset types were first introduced in 1963 and produced through the mid-seventies and has been used in a wide range of cars. There are versions for longitudinal and transverse engines.

Planetary gearset concept

+ Planetary gearset concept: gear ratio quality In-Depth AnalysisWith AssessmentAnd Torque RatioAnd Efficiency Calculation Planetary Gearset:Teeth Count Nomi-nalEffec-tive Cen-ter Ravigneaux Avg. ModelType VersionFirst Delivery S1R1 S2R2 BrakesClutches RatioSpan GearStep Gear R 1 2 3 GearRatio Step Δ Step ShaftSpeed Δ ShaftSpeed TorqueRatio Efficiency 3HP 12 Small engines 1963 2532 3264 32 Gear R 1 2 3 GearRatio Step 1.0000 1.5200Δ Step 1.1080 Speed 1.0000 1.6842 2.5600 Δ Speed 1.0000 0.6842 0.8758 TorqueRatio –1.9600–1.9400 2.48362.4457 1.49281.4792 1.0000 Efficiency 0.98000.9700 0.97020.9553 0.98210.9731 1.0000 3HP 12 Large Engines1963 2832 3264 32 Gear R 1 2 3 GearRatio Step 1.0000 1.6000 1.4286 Δ Step 1.1280 Speed 1.0000 1.6000 2.2857 Δ Speed 1.0000 0.6000 0.6842 TorqueRatio –1.9600–1.9400 2.21752.1836 1.40381.3914 1.0000 Efficiency 0.98000.9700 0.97020.9553 0.98260.9740 1.0000 Actuated shift elements Brake A ❶ Brake B ❶ Brake C ❶ ❶ Clutch D ❶ ❶ ❶ Clutch E ❶ ❶ Geometric ratios: speed conversion GearRatioOrdinaryElementaryNoted Kinetic ratios: torque conversion TorqueRatio

1973: 3HP 22— Simpson planetary gearset types —

History

The all new Simpson planetary gearset was introduced in 1973 and was produced through 1990 and has been used in a wide range of cars from Alfa Romeo, BMW, Citroën, Peugeot, and Fiat. There are versions for longitudinal and transverse engines.

Specifications

+ Specifications Weight with converter Control mechanical · hydraulic

Planetary gearset concept

+ Planetary gearset concept: gear ratio quality In-Depth AnalysisWith AssessmentAnd Torque RatioAnd Efficiency Calculation Planetary Gearset:Teeth Count Nomi-nalEffec-tive Cen-ter Simpson Avg. ModelType VersionFirst Delivery S1R1 S2R2 BrakesClutches RatioSpan GearStep Gear R 1 2 3 GearRatio Step Δ Step ShaftSpeed Δ ShaftSpeed TorqueRatio Efficiency 3HP 22 1973 3573 3573 32 Gear R 1 2 3 GearRatio Step 1.0000 1.4795 Δ Step 1.1328 Speed 1.0000 1.6759 2.4795 Δ Speed 1.0000 0.6759 0.8035 TorqueRatio –2.0440–2.0231 2.43032.4060 1.46991.4651 1.0000 Efficiency 0.98000.9700 0.98020.9704 0.99350.9903 1.0000 3HP 22 Small Engines1973 3573 4173 32 Gear R 1 2 3 GearRatio Step 1.0000 1.5616 Δ Step 1.1207 Speed 1.0000 1.7501 2.7331 Δ Speed 1.0000 0.7501 0.9829 TorqueRatio –2.0440–2.0231 2.67552.6470 1.55041.5448 1.0000 Efficiency 0.98000.9700 0.97890.9685 0.99280.9892 1.0000 3HP 22 Porsche 9441981 2868 3264 32 Gear R 1 2 3 GearRatio Step 1.0000 1.5000 Δ Step 1.2063 Speed 1.0000 1.8095 2.7143 Δ Speed 1.0000 0.8095 0.9048 TorqueRatio –2.3800–2.3557 2.65622.6275 1.49001.4850 1.0000 Efficiency 0.98000.9700 0.97860.9680 0.99330.9900 1.0000 Actuated shift elements Brake A ❶ Brake B ❶ ❶ Brake C ❶ ❶ Clutch D ❶ ❶ ❶ Clutch E ❶ ❶ Geometric ratios: speed conversion GearRatioR & 2OrdinaryElementaryNoted GearRatio1 & 3OrdinaryElementaryNoted Kinetic ratios: torque conversion TorqueRatioR & 2 TorqueRatio1 & 3

See also

list of ZF transmissions

References