2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

3. Stiffness of the bearings 4. Clearance into the bearings 5. Stiffness of the gearbox housing in the area of bearings

All these parameters can be included in the gear calculation in the Kisssoft software available to Wikov MGI. Thanks to these possibilities, an experimental design was performed with nine different modifications of pinion teeth and nine different modifications of gear teeth. All basic shapes of micro-geometries can be seen in Figure 2. In terms of shape, the micro-geometries are the same for both the pinion and the wheel. Using the Full Factorial tool in the Design-Expert software, 81 combinations for real noise measurements were designed in various steps.

Figure 2: Micro-geometry

1. without profile modification

4. without lead modification

2. tip relief

5. crowning 6. end relief

3. envelope barrelling

Source: own elaboration (2019), reference paper [2] All designed micro-geometries and basic gear geometry have been optimized for a specific load that corresponds approximately to rolling stock applications. Figure 3 shows a sample of gear pair and Figure 4 shows an available test stand in Wikov company. The A-weighted sound pressure level was measured using a Pulse device from Brüel & Kjær at a distance of 1m from the largest face of the gearbox.

Figure 3: Test sample of gear pair

Source: own elaboration (2019), reference paper [2]

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