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Variable Valvetrain Systems

Schaeffler eRocker System

New Concepts for Switchable Roller

I. Introduction

Figure 1 Product launch of gasoline engines with cylinder deactivation

II. Development of switchable roller finger followers for the gasoline engine

Figure 2 Switchable roller finger followers on an early generation (left) and on the current generation (right) for gasoline engines

Figure 3 Relationship between additional expense and fuel savings of switchable finger followers (turquoise) and cam shifting system (light blue) for different vehicle segments

Figure 4 The innovative twin-pallet design allows two valves to be actuated using just one switchable finger follower

III. eRocker System from Schaeffler

Figure 5 Overall design of the eRocker System with roller finger followers switched by electromechanical actuation

Figure 6 Actuator/slider bar motion with blocked locking pin via spring arm (left) and position after displacement (valve deactivated, right); locking mechanism partially cut away

IV. Switchable finger followers for the diesel engine

Figure 7 Switching strategies for the variable valve train in a diesel engine

Figure 8 Improved switchable roller finger followers for diesel engines from Schaeffler

Figure 9 eRocker System for secondary exhaust valve lift (SEVL) application in a diesel engine

Figure 10 Intake backflow (left) and transfer of contact from main to secondary lift (right)

Figure 11 Multi-mode switching concept via the e-rocker system

V. Testing of the eRocker System – Initial results

Figure 12 Multi-mode switching concept

Figure 13 Switching time for interlocking SEVL systems in relation to oil temperature and internal engine constraints

Figure 14 Variation in switching time

VI. Summary and outlook

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