2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

has focused primarily on optimizing helical gears to reduce noise emissions through an extensive DOE full factorial experiment that tested 81 combinations of different gear micro-geometries. However, the transmission that will be optimized later in this article is a two-stage system. The first gear pair at the input is a bevel gear and the second gear is helical. We have not optimized noise reduction for Klingenberg bevel gears in the past, so we decided to work with Hexagon to design a new type of gearbox, which uses the appropriate Romax software, which can also include the results of bevel gear micro geometry optimization from special KIMoS software for production. Furthermore, the optimal distribution of resonance areas with respect to operating modes and prescribed It is a two-stage bevel gearbox with a gear ratio of 6.78 (Fig.1), where the first gear is realized by a Klingenberg bevel gear with a maximum input speed of 4200rpm. The maximum torque on the input shaft is 1050Nm. The second output stage is the helical gear. The gearbox is firmly connected to the motor housing and a membrane coupling connects the shafts. The gearbox is connected to the axle by a flexible coupling. The gearbox and motor housing are connected to the chassis with three silent blocks. tonality was solved in this software. 1.1 Description of the gearbox

Figure 1: Tram gearbox and torsional structure

Source: Wikov Design of gearbox (2021)

2. Helical gear micro-geometry optimization As part of its systematic work to reduce the acoustic emission of gearboxes, the Wikov MGI company has focused in recent years on optimizing the micro-geometry of gears thanks to the TAČR CKVD research program [2]. The effect of gear geometry itself has been elaborated in detail at FZG Munich [4] and can be very well drawn from the research materials. As far as the micro-geometry of the gears is concerned, this is a more complex task, as it is necessary to focus not only on the reduction of noise emission but also on the guaranteed service life of the gears when designing the micro geometry. The following parameters must be considered for the correct design of gear micro-geometry [1]: 1. Def lection of the teeth. 2. Bending and Torsion of the shafts

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