Abstract
Reducing of frictional losses between moving parts of drivelines is a permanently current topic for both conventional internal combustion engines and modern hybrid or electric drives. The application of low viscosity oils leads to the reduction of friction losses of moving engine components and thus to low fuel consumption. Further measures to increase efficiency, such as reducing the oil flow rate, must also be taken into account in their effect on functional behavior. All in all, these measures place increased demands on the functionality and durability of engine components such as piston rings and plain bearings. The effects of low viscosity engine oils on piston rings and plain bearings can be evaluated using specific computational tools and newly developed test methods. Another option to reduce the power dissipation in drive units is to use a suitable torsional vibration damper type.
Highlights
When designing a torsional vibration damper, it is necessary to carefully check, in addition to the mechanical parameters, the effects of the dissipated power in the damper
The power dissipation in the torsional vibration damper is a part of the total mechanical losses in the drive unit
Careful selection of an appropriate type of torsional damper can yield a comparable reduction of mechanical losses, as mentioned above in the most recent modification of the piston and sliding bearings
Summary
When designing a torsional vibration damper, it is necessary to carefully check, in addition to the mechanical parameters, the effects of the dissipated power in the damper. The transfer of this power in the form of heat must be ensured. In the field of internal combustion engines, no suitable and universally applicable design solution of the dynamic torsional damper with the coupling by the rheological parallel twoparameter model has been developed, which would allow optimal and stable parameters of the viscoelastic coupling and a favorable damping effect in accordance with the theoretical analysis and the possibilities of this damper type [2, 3]. The further development of powertrains, which is characterized both by the increase in operating parameters and by the application of some previously unusual configurations of multi-cylinder engines, calls for new approaches to the issue of engine dynamics, e.g. the design of principle new systems of vibration damping based on other configurations of masses and elastic and damping couplings of the dynamic vibration dampers
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