itc Innovative solutions for torque converters pave the way into the future Markus Steinberger

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Audra Rich
6 years ago
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1 itc Innovative solutions for torque converters pave the way into the future

2 Father of the torque converter Hermann Föttinger

3 First TC in mass production 74 Years of TC. Everything invented? 2

4 Rumor has it Torque Converter 1940-? 3

5 What is a torque converter? Launch device Clutch Torsional vibration isolator Continuously variable transmission 4

6 The main torus function Launch device Performance Customer success decided by Cost Efficiency 5

7 Engine Trans. Engine Trans. Engine speed Engine speed Comparison: launch efficiency Speed to reach desired launch torque Friction losses Hydrodynamic losses Time Time Torque ratio amplifies to launch torque Wet or dry clutch Torque converter 6

8 Engine speed Engine speed Comparison: launch efficiency TC has up to TWICE the efficiency of a Hydrodynamic losses friction clutch Time Time Torque converter Friction clutch 7

9 TC innovation since the last Symposium New during Symposium 2010 Goal from Symposium 2010 TC as a launch device Limited damper performance 8

10 TC innovation since the last Symposium New during Symposium 2010 Production during Symposium 2014 TC as a launch device Limited damper performance True launch-and-lock Superior damper performance Cylinder deactivation 6 to 3 cylinders More than 30 damper travel and CPA 9

11 TC innovation - piston State of the art piston connection Schaeffler piston riveting Eliminates riveting connection Fewer components Saves space 10

12 TC innovation - piston Leaf springs Piston assembled deflected rivet formed riveted to cover 11

13 TC innovation - flange State of the art damper hub Schaeffler net formed flange Fewer components Reduced weight Simplified design 12

14 TC innovations Schaeffler friction material Pendulum damper Piston bushing 13

15 TC innovation recognition 14

Globally sold AT vehicles in Millions Global sales: cars with automatic transmissions 60 50 40 30 Automatic

16 Globally sold AT vehicles in Millions Global sales: cars with automatic transmissions Automatic transmissions with torque converter Automatic transmissions without torque converter Year Source: IHS 15

17 Innovation...Everything that can be invented has been invented. Charles H. Duell Commissioner of the US Patent Office

18 What's next? The Symposium is about the FUTURE, not the PAST. 17

19 Simple idea Integrate turbine and piston TM 18

20 itc function Clutch disengage Clutch release force TM o Pressure separates turbine and impeller o Flow enters at stator shaft o Complete liftoff at very low release pressure 19

21 itc function Clutch apply o Turbine applies towards impeller o Flow direction opposite of typical TC Apply pressure TM Clutch apply force 20

Bernoulli effect and itc Force from pressure difference

in the speed of the fluid occurs simultaneously with a

" Reaction force Lift High velocity, low pressure Low oil

22 Bernoulli effect and itc Force from pressure difference Resulting clutch force " For an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure." Reaction force Lift High velocity, low pressure Low oil velocity, higher pressure Daniel Bernoulli High oil velocity, lower pressure Low velocity 21

23 pressure in bar speed in rpm Clutch engagement measurement impeller speed smooth engagement turbine speed smooth release time in s clutch pressure 22

24 Clutch drag check Clutch drag comparison Clutch forced to stay open TM 1. Run characteristic as itc 2. Block itc function 3. Re run test 4. Compare results Blocked itc function with additional bearing for test 23

25 Torque ratio Clutch drag measurement No difference in torque converter characteristic No drag measurable K-factor (stiffness) Blocked itc K-factor in 100 rpm/nm ½ 0.5 itc Speed ratio 24

26 Note from my old Friend 25

27 itc advantages TM More space for damper (CPA in front wheel drive) Reduced mass and inertia Impeller thrust washer No turbine bearing Simpler, more compact design 26

28 Damper torque in Nm Dry weight comparison Current production itc design Damper angle in 13.1 kg 10.7 kg 27

29 itc advantages Simplified damper inputs (modular design) TM 28

30 itc advantages No weld behind friction surface (hot spots) TM Improved clutch stability due to thrust Blades stiffen friction surface Improved TC efficiency due to smaller gap 29

31 Torque converter evolution Value Innovation TM Next generation 2014 new production 2010 new production 31

32 Multi function integrated torque converter Impeller clutch TM Lockup clutch 32

33 Design layout Impeller clutch TM Lockup clutch Vent to sump between bushing and seal Low to high pressure controlled Low or high pressure not controlled 33

34 Idle disconnect TM Lockup clutch Open Impeller clutch Open Sump TC port Lockup port 34

35 Launch and drive with open TC TM Lockup clutch Open Impeller clutch Closed Open Sump TC port Lockup port 35

36 Lockup clutch at touch point TM Lockup clutch Open Impeller clutch Closed Sump TC port Lockup port 36

37 Lockup clutch applied TM Lockup clutch Closed Open Impeller clutch Closed Sump TC port Lockup port 37

38 Lockup clutch at touch point TM Lockup clutch Closed Open Impeller clutch Closed Sump TC port Lockup port 38

39 TC mode TM Lockup clutch Open Impeller clutch Closed Sump TC port Lockup port 39

40 Idle disconnect TM Lockup clutch Open Impeller clutch Closed Open 40

41 mtc benefits TM mtc use o Overcome turbo lag of turbo charged engines o Reduce start drag of small engines 41

42 itc modularity Damper technology Multi function technology TM TM 42

43 itc benefits o Reduced space, mass and inertia o Enables CPA in FWD package o More TC functionality possible (variable K-factor, idle disconnect, ) Product Focus o Modern automatic transmissions o Front and rear wheel drive 43

44 itc...everything that can be invented...everything that can be invented has been been invented. invented. Charles H. Duell Commissioner of the US Patent Office

DRIVETRAIN 7.0 Introduction 7.1 Drivetrain configurations 7.2 Drivetrain elements 7.3 Clutch Operation

DRIVETRAIN 7.0 Introduction 7.1 Drivetrain configurations 7.2 Drivetrain elements 7.3 Clutch Operation DRIVETRAIN 7.0 Introduction Drivetrain is the assembly of all the components that are involved in the transmission of the power from the engine of the vehicle to its wheels. 7.1 Drivetrain configurations