2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

Gear life prediction based on load spectrum Zdenek Folta 1 , Jan Pavlik 2 , Miroslav Trochta 3 VSB – Technical University of Ostrava Department of Machine Parts and Mechanisms 17. listopadu 2172/15 70800 Ostrava – Poruba Czech Republic e-mail: zdenek.folta@vsb.cz 1 , jan.pavlik@vsb.cz 2 , miroslav.trochta@vsb.cz 3

Abstract This article describes the methodology of measuring the load spectrum (torques and speeds) when driving a car on different types of routes. Subsequently, it describes their processing using schematics to obtain the equivalent torque or degree of damage. The last part describes the gear life prediction based on the character of different travel routes. Keywords: degree of damage, equivalent torque, lifetime, load spectrum, schematisation JEL Classification: C8, O3 1. Introduction Any machine component that is stressed with variable loads has the potential to be damaged over time by fatigue failure. Whether the equipment will be damaged during its period of operation or for how long, is influenced by many parameters. On the component side, this is mainly determined by the shape of the component (Brumercik, 2020) (Gramblička, 2020) and its material properties (Hohn, 2003) (Hong, 2021). On the load side, the magnitude and frequency of variable load actions are decisive. Gears are mainly exposed to two types of possible fatigue failures (Fig. 1), namely damage resulting from contact (Weresa, 2015) and from bending (Ličková, 2021). It should be noted that another serious way of damaging the gears can be caused by abrasion (jamming), which, however, does not display a fatigued character and, therefore, the following procedure cannot be used for such a prediction of gearings.

Figure 1: Typical tooth damage caused by contact (on the left) and by bending (on the right)

Source: own elaboration (2022)

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