Abstract
Recent studies show that hybrid powertrains with dual clutch transmission are becoming more common. This is mainly influenced by the fact that they have higher efficiency, allow power-on shifting, and are more compact. However, the electric motor attached to the primary shaft of the transmission might represent some critical issues in statics and dynamics due to additional torque, inertia, and working irregularities. This paper aims to investigate the influence of the electric motor integration in the transmission on the reliability of the overall system. The focus is on the investigation of potential over stresses of the ICE bearings due to the bending of the gearbox primary shaft. To achieve the aim, the static and the rotor dynamic analysis of the inner and outer primary shafts is performed. The numerical analyses show the potential critical issues that can arise from the excessive manufacturing and assembling tolerances, the interaction of the e-machine torque irregularities and inertia with the bending dynamics of the primary shafts.
Highlights
Energies 2022, 15, 945. https://New ambitious targets on the amount of CO2 emissions set by European Commission [1,2] require implementation of even more efficient technologies from car manufacturers
4th gear, deflection in 2nd gear is less compared to other scenarios due to presence of the Ball Bearing 1 (BB1) next to G4, where the forces are applied
Rotor Dynamic Analysis mode the displacement reaches a maximum value of 46 μm (Figure 8) compared to the
Summary
New ambitious targets on the amount of CO2 emissions set by European Commission [1,2] require implementation of even more efficient technologies from car manufacturers. Since the last decade of the 20th century, a wide variety of different technologies and policies aiming the reduction of vehicle fuel consumption and emissions at different vehicle and infrastructure level are widely implemented [3,4]. The real motivation to the hybridization is the more stringent limit to the emissions. This reduction is not achieved by simple ICE tuning and pushes towards hybrids [5]. Hybridized powertrains can be generally of a dedicated or an add-on type [6,7]
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