2nd ICAI 2022

International Conference on Automotive Industry 2022

Mladá Boleslav, Czech Republic

2. Problem formulation, methodology approach to problem analysis The aim of the research was to identify the sizes of the gear tooth contact patterns that are influenced by the behaviour of structural components such as bearings and gear shifting mechanism. Two methods were used to determine the influence of the engagement area. The first method is the experimental imprint method in a real gearbox, which is based on the abrasion of a gear marking compound coating applied on the both tooth flanks. This method was accompanied by the second method by the theoretical calculation apparatus Multi-body System (MBS), which was used to calculate the deformation and stress distribution of the parts due to the action of other bodies by calculating on a model tuned by experimental measurements. The MBS model was then used to determine the degree of influence from the observed factor, whereby effects that cannot always be eliminated in reality can be easily suppressed in the simulation. Furthermore, the MBS method can be conveniently used to quickly determine the degree of influence of the factor under study, where conducting an experiment would be time and cost consuming due to the production of accurate part dimensions. 3. Solution procedure In the process of assessing the size of the contact pattern, the gearbox design was analyzed and structural arrangements that could affect the contact pattern were identified. Analysis of the effect of the change gear fit on the needle bearings, shaft fit, sliding sleeve and needle bearing rolling element bodies were performed. 3.1 Effect of the change gear on needle roller bearings (radial clearance, axial clearance) This factor has been experimentally investigated on the MQ200 gearbox on a sixth speed gear, where the drive gear wheel is mounted on needle bearings with a radial clearance of about 0.01 to 0.05mm and an axial clearance of about 0.2 to 0.3mm (Figure 4). Figure 4: Schematic arrangement of the examined gearbox and its sixth gear

Source: Škoda Auto, a.s., internal materials

40