Friction wedge design optimized for high warp friction moment and low damping force

摘要

A damping system for a rail car truck utilizes friction wedges supported on side springs to damp relative movement between the rail car truck bolster and the side frames supporting it. Each friction wedge has a generally triangular shape with an angle theta defined between a vertical friction surface which bears against a side frame and a sloping friction surface which moves relative to the bolster. The angle theta and the force P of each side spring are defined by 1 ${\mathrm{Fw}}_{W.E}=\frac{-P}{2}·\frac{\left(\cos \left(\mathrm{theta}\right)+{\mathrm{mu}}_{2w}·\sin \left(\mathrm{theta}\right)\right)}{({\mathrm{mu}}_{1w}·\cos \left(\mathrm{theta}\right)+{\mathrm{mu}}_{1w}·{\mathrm{mu}}_{2w}·\sin \left(\mathrm{theta}\right)+{\mathrm{mu}}_{2w}·\cos \left(\mathrm{theta}\right)}$