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Torque Converter

Efficient Solutions for Automatic Transmissions

Torque Converters and Clutch Packs

I. Introduction

II. Four-passage torque converter

Figure 1 Comparison of a two-pass and a three-pass converter

Figure 2 Design of the four-pass torque converter

Figure 3 Comparison of the slip speeds of two-pass, three-pass and four-pass systems

III. Integrated torque converter – iTC

Figure 4 Design of a conventional converter (left) and an iTC (right)

Figure 5 Integrated torque converters (iTC, top) for front-wheel (FWD, left) and rear-wheel drives (RWD, right)

Figure 6 Design and function of the coast engagement diaphragm spring

Figure 7 Preparation of adhesive surface by laser etching

IV. Torsion dampers for torque converters

Figure 8 Isolation comparison of torsion dampers with and without a CPA

Figure 9 Isolation comparison of torsion dampers with CPA and double CPA

Figure 10 Design of the inline CPA using a DTD with a double CPA as an example

Figure 11 Isolation potential of torsion dampers with CPA and double CPA upon cylinder deactivation of two cylinders of a four-cylinder engine

Figure 12 Effect of gravity on the pendulum motion in a 1st order CPA

Figure 13 Damper concepts TD and DTD with double CPA

V. Absorbers in the torque converter

Figure 14 Isolation comparison of torsion dampers with and without turbine tilger

VI. Technology transfer to future products

Figure 15 Concept for clutches with an optimized design space

Figure 16 Concept of a clutch with self-amplifying actuation

VII. Summary

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