DYNAMIC PERFORMANCE OPTIMIZATION AND WEAR REDUCTION OF THE CAM SYSTEM IN CARDAN COUPLINGS FOR METRO ROLLING STOCK TRACTION DRIVES
DOI:
https://doi.org/10.5281/zenodo.21914756Abstract
The continuous increase in passenger traffic and operational intensity in modern urban metro
systems places stringent demands on the reliability of rolling stock traction drives. The dynamic behavior,
contact stress distribution, and wear mechanisms of the cam system within cardan couplings used in metro
car traction transmission units are investigated. Traditional symmetric cam profiles do not adequately damp
torsional shock loads during rapid acceleration and regenerative braking, resulting in premature backlash and
vibration. To address this problem, a modified asymmetric involute cam profile integrated with high-durability
elastomeric dampers is proposed and evaluated using finite element analysis and multi-body dynamics
simulation. The results demonstrate that the proposed profile redistributes localized contact pressures and
reduces peak stress concentrations by up to 28.4%. The scientific novelty lies in the development of a
nonlinear contact model that accounts for multi-axial shaft misalignments and dynamic torque fluctuations
specific to metro operating cycles. The findings provide a practical engineering solution for extending the
service life of traction coupling assemblies in metro bogies.
Keywords
metro rolling stock, traction drive, cardan coupling, cam system, contact stress, asymmetric profile, multi-body dynamics, wear reduction.References
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