itc Innovative solutions for torque converters pave the way into the future
Father of the torque converter Hermann Föttinger 1877-1945 1
First TC in mass production 74 Years of TC. Everything invented? 2
Rumor has it Torque Converter 1940-? 3
What is a torque converter? Launch device Clutch Torsional vibration isolator Continuously variable transmission 4
The main torus function Launch device Performance Customer success decided by Cost Efficiency 5
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
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
TC innovation since the last Symposium New during Symposium 2010 Goal from Symposium 2010 TC as a launch device Limited damper performance 8
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
TC innovation - piston State of the art piston connection Schaeffler piston riveting Eliminates riveting connection Fewer components Saves space 10
TC innovation - piston Leaf springs Piston assembled deflected rivet formed riveted to cover 11
TC innovation - flange State of the art damper hub Schaeffler net formed flange Fewer components Reduced weight Simplified design 12
TC innovations Schaeffler friction material Pendulum damper Piston bushing 13
TC innovation recognition 14
Globally sold AT vehicles in Millions Global sales: cars with automatic transmissions 60 50 40 30 Automatic transmissions with torque converter 20 10 0 Automatic transmissions without torque converter 2013 2015 2020 Year Source: IHS 15
Innovation...Everything that can be invented has been invented. Charles H. Duell Commissioner of the US Patent Office 1899 16
What's next? The Symposium is about the FUTURE, not the PAST. 17
Simple idea Integrate turbine and piston TM 18
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
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 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 1700-1782 pressure Daniel Bernoulli High oil velocity, lower pressure Low velocity 21
pressure in bar speed in rpm Clutch engagement measurement 3000 2000 impeller speed smooth engagement 1000 0 turbine speed smooth release 2.0 1.5 1.0 0.5 0.0 0 5 10 15 20 time in s clutch pressure 22
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
Torque ratio Clutch drag measurement 3.0 2.5 No difference in torque converter characteristic No drag measurable 12 10 2.0 1.5 1.0 K-factor (stiffness) Blocked itc 8 6 4 K-factor in 100 rpm/nm ½ 0.5 itc 2 0.0 0 0.0 0.2 0.4 0.6 0.8 1.0 Speed ratio 24
Note from my old Friend 25
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
Damper torque in Nm Dry weight comparison Current production itc design Damper angle in 13.1 kg 10.7 kg 27
itc advantages Simplified damper inputs (modular design) TM 28
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
Torque converter evolution Value Innovation TM Next generation 2014 new production 2010 new production 31
Multi function integrated torque converter Impeller clutch TM Lockup clutch 32
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
Idle disconnect TM Lockup clutch Open Impeller clutch Open Sump TC port Lockup port 34
Launch and drive with open TC TM Lockup clutch Open Impeller clutch Closed Open Sump TC port Lockup port 35
Lockup clutch at touch point TM Lockup clutch Open Impeller clutch Closed Sump TC port Lockup port 36
Lockup clutch applied TM Lockup clutch Closed Open Impeller clutch Closed Sump TC port Lockup port 37
Lockup clutch at touch point TM Lockup clutch Closed Open Impeller clutch Closed Sump TC port Lockup port 38
TC mode TM Lockup clutch Open Impeller clutch Closed Sump TC port Lockup port 39
Idle disconnect TM Lockup clutch Open Impeller clutch Closed Open 40
mtc benefits TM mtc use o Overcome turbo lag of turbo charged engines o Reduce start drag of small engines 41
itc modularity Damper technology Multi function technology TM TM 42
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
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 1899 44