中国汽车技术论坛_6 Speed Lepelletier Gearset.ppt

Tom Birch, 8/06 Lepelletier Gearset 6-Speed Gearset Lepelletier Gearset Transmissions Transaxle Transmission Schematic, Geartrain Gearset Gear Ratios Schematic, Geartrain 2 Schematic, Control Devices Variation Clutch Schedule Schematic, Neutral Schematic, 1st Gear Schematic, 2nd Gear Schematic, 3rd Gear Schematic, 4th Gear Schematic, 5th Gear Schematic, 6th Gear Schematic, Reverse * * Transmissions that use a Lepelletier geartrain include: Aisin AW: TR-6, TF-60SN, TF80SN Ford: 6R60 6R75 General Motors: 6L80 ZF: 6HP19 6HP26 FWD Transaxle RWD Transmission This is a compact 6-speed geartrain with FWD and RWD configurations, and it uses only six control devices. The Lepelletier design uses a simple gearset to drive a Ravigneaux gearset. Simple Gearset Ravigneaux 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 4.15:1 Reduction Reduction 1st 3.39:1 Reverse Reduction Rev. 0.69:1 Overdrive ----------- 6th 0.86:1 Overdrive Reduction 5th 1.15:1 Overdrive Reduction 4th 1.56:1 1:1 Reduction 3rd 2.37:1 Reduction Reduction 2nd Gear Ratio Ravigneaux Gearset Simple Gearset Gear Sun Gear Large Sun Gear Small Sun Gear Short Pinions Ring Gear Carrier Long pinions Ring Gear The nomenclature for many modern transmissions uses the terms C for clutch (driving member) and B for brake (holding member). B1 B2 C2 C3 C1 Some Lepelletier geartrains include a one-way clutch (F1) to allow a freewheeling 1-2 shift. F1 X X R X X 6 X X 5 X X 4 X X 3 X X 2 X X 1 B2 B1 C3 C2 C1 Gear This is a synchronous, overlap geartrain. Input Reaction Output All clutches are released. Input Reaction Output C1 drives the small sun gear at a reduced speed in 1st, 2nd, 3rd, and 4th gears. C1 Applied B2 Holding Ratio: 4.15:1 Input Reaction Output C1