2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

arrangement of both shafts without bearings in the cover (Figure 10b). Third step: Simulation of both shaft bearings with zero radial clearance (Figure 10c). The figures (Figures. 10a; 10b; 10c) show the results of the contact simulation. The degree of its influence from the bearing radial clearances between the bearing inner ring, the rolling element and the bearing outer ring can be traced. In particular, the greatest influence is seen between the fixed and loose bearing and the bearing without clearance. Between a loose bearing and a real bearing with clearance of 0,16mm, the effect can also be observed, but is not as pronounced. From the simulation (Figure 10b) – where a shaft deflection of 0.08mm was found at a load of 30 Nm, it can be derived by logical deduction that the influence of the contact pattern from the cylindrical roller bearing with a radial clearance of 0.16mm will only occur in this case at loads from 30 Nm upwards. Or, at 30 Nm, the clearances in the bearings will be adjusted to zero and the bearing will continue to serve as a supporting functional member. By clearance adjustment occurs the different relative position (slope) of the wheels (Figure 10b and 10c). Figure 10: Contact pattern simulation a) real cylindrical roller shaft bearings in the cover with a radial clearance of 0.16 mm b) outboard mounted shafts without cylindrical roller bearings in the cover, shaft deflection 0.08 mm c) cylindrical roller shaft bearings in the cover without radial clearance

Source: Škoda Auto, a.s., internal materials However, in an experiment to prove the behaviour estimation from the MBS calculation, it was found that the agreement between simulation and experiment was not sufficient with respect to the different shaft bearing clearances. (Figure 11).

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