Tom Birch, 8/06*Lepelletier Gearset6-Speed Gearset

Tom Birch, 8/06

Tom Birch, 8/06*Lepelletier Gearset TransmissionsTransmissions that use a Lepelletier geartrain include:Aisin AW: TR-6, TF-60SN, & TF80SNFord: 6R60 & 6R75General Motors: 6L80ZF: 6HP19 & 6HP26

Tom Birch, 8/06

Tom Birch, 8/06*Transaxle & TransmissionFWD Transaxle RWD TransmissionThis is a compact 6-speed geartrain with FWD and RWD configurations, and it uses only six control devices.

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, GeartrainThe Lepelletier design uses a simple gearset to drive a Ravigneaux gearset.

Simple Gearset Ravigneaux Gearset

Tom Birch, 8/06

Tom Birch, 8/06*Gearset The simple gearset portion serves as a reduced-speed input in first through fifth and reverse gears. The Ravigneaux part of the gearset is similar to the gearset used in a Ravigneaux 4-speed transmission.

Simple Gearset Ravigneaux Gearset

Tom Birch, 8/06

Tom Birch, 8/06*Gear Ratios

GearSimple GearsetRavigneaux GearsetGear Ratio1st ReductionReduction4.15:12nd ReductionReduction2.37:13rd Reduction1:11.56:14th ReductionOverdrive1.15:15th ReductionOverdrive0.86:16th -----------Overdrive0.69:1Rev.ReductionReverse3.39:1

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, Geartrain 2

Sun Gear Large Sun Gear Small Sun GearShort PinionsRing Gear Carrier Long pinions Ring Gear

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, Control DevicesThe nomenclature for many modern transmissions uses the terms C for clutch (driving member) and B for brake (holding member).

B1 B2C2C3 C1

Tom Birch, 8/06

Tom Birch, 8/06*VariationSome Lepelletier geartrains include a one-way clutch (F1) to allow a freewheeling 1-2 shift.F1

Tom Birch, 8/06

Tom Birch, 8/06*Clutch ScheduleThis is a synchronous, overlap geartrain.

GearC1C2C3B1B21XX2XX3XX4XX5XX6XXRXX

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, Neutral

Input Reaction OutputAll clutches are released.

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, 1st Gear

Input Reaction Output

C1 drives the small sun gear at a reduced speed in 1st, 2nd, 3rd, and 4th gears.

C1 AppliedB2 HoldingRatio: 4.15:1

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, 2nd Gear

Input Reaction Output

C1 AppliedB1 HoldingRatio: 2.37:1

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, 3rd Gear

Input Reaction Output

C1 AppliedC3 AppliedRatio: 1.56:1

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, 4th Gear

Input Reaction Output

C2 AppliedC1 AppliedRatio: 1.15:1

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, 5th Gear

Input Reaction OutputC2 Applied

Ratio: 0.86:1C3 Applied

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, 6th Gear

Input Reaction OutputC2 Applied

Ratio: 0.69:1B1 Holding

Tom Birch, 8/06

Tom Birch, 8/06*Schematic, Reverse

Input Reaction Output

C3 AppliedB2 HoldingRatio: 3,39:1

Tom Birch, 8/06