ZF 3HP transmission explained

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.

1963: 3HP 12 · Ravigneaux Planetary Gearset Types

Introduction

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.

Specifications

Gear Teeth and RatiosPlanetary Gearset
Teeth Ravigneaux
CountTotalAvg.
ModelVersion
First Delivery

{S1}


{R1}

{S2}


{R2}

Brakes
Clutches
Ratio
Span
Gear
Step
Gear

n

R123
Step

in-1/in

 - R : 11 : 22 : 3
3HP 12[1]
Small Engines
196325
32
32
64
3
2
Ratio

in


-\tfrac{2}{1}


\tfrac{64}{25}


\tfrac{38}{25}


\tfrac{1}{1}

Step0.78131.68421.5200
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}

Step0.87501.60001.4286
Ratio

-\tfrac{R2}{S2}

\tfrac{R1R2}{S1S2}

\tfrac{R2(S1+R1)}{S1(S2+R2)}

\tfrac{1}{1}

1973: 3HP 22 · Simpson Planetary Gearset Types

Introduction

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]

Specifications

Weight45kg (99lb) with converter
Controlmechanical · hydraulic
Gear Teeth and RatiosPlanetaryGearset
Teeth Simpson
CountTotalAvg.
Model
Type
Version
First Delivery

S1


R1

S2


R2

Brakes
Clutches
Ratio
Span
Gear
Step
Gear

n

R123
Step

in-1/in

 - R : 11 : 22 : 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}

Step0.84121.67591.4795
3HP 22
Small Engines
197335
73
41
73
3
2
Ratio

in


-\tfrac{73}{35}


\tfrac{6,983}{2,555}


\tfrac{114}{73}


\tfrac{1}{1}

Step0.76311.75011.5616
3HP 22
Porsche 944
198128
68
32
64
3
2
Ratio

in


-\tfrac{17}{7}


\tfrac{19}{7}


\tfrac{3}{2}


\tfrac{1}{1}

Step0.89471.80951.5000
Ratio

-\tfrac{R1}{S1}

\tfrac{S1(S2+R2)+R1S2}{S1R2}

\tfrac{S2+R2}{R2}

\tfrac{1}{1}

See also

Notes and References

  1. Josef Stueper · Automatische Automobilgetriebe (Automatic Vehicle Transmissions) · p. 343 · Wien and New York 1965 · Print · Online >
  2. Web site: BMWE21.net. BMWe21.net. 24 November 2013.
  3. Web site: ZF North America application chart (automatic). ZF.com. 22 November 2013.