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Transmission Systems

The Transmission

Now and in Future the Most Efficient Connection

Between the Powertrain and the Road

I. Introduction

Figure 1 Automation trend in transmission systems and percentage of powertrain concepts in the overall market in the Schaeffler scenario for 2030

Figure 2 Transmission system trends and products and system solutions developed by Schaeffler

II. New concepts for low-friction rolling bearings in all transmission types

Figure 3 Comparison of the design principle of a tapered roller bearing and an angular roller unit (ARU) (left) as well as loading conditions for an ARU with preferred direction (right)

III. Use of CAE tools

Figure 4 Optimization variants reached in comparison with a basic clutch

IV. Isolation of torsional vibrations

Figure 5 Couple pendulum and iso-radial pendulum (top) with a diagram of vibration amplitudes in relation to the speed (bottom)

Figure 6 DTH damper with integrated slip clutch as a torque limiter

V. Real power-on-demand actuators

Figure 7 Actuator system for double clutch transmissions with two EPA and one HGA

VI. More efficiency in individual transmission designs

Figure 8 Design of the four-channel torque converter with four hydraulic connections for compensating centrifugal oil pressure

Figure 9 Wet double clutch with rotary oil feeds and rotating cylinders (left) as well as wet and dry double clutch with engagement bearings (center and right)

Figure 10 Variants for clutch automation: MTplus, clutch-by-wire (CbW) and electronic clutch management (ECM)

VII. Summary

The digital version of the Schaeffler Symposium 2018 “Mobility for Tomorrow” conference transcript

II. New concepts for low-friction rolling bearings in all transmission types

III. Use of CAE tools

IV. Isolation of torsional vibrations

V. Real power-on-demand actuators

VI. More efficiency in individual transmission designs