Patent ID: 6269752
Filing Date: 2001-08-07
Classification: B61F

Abstract:
A method of designing a rail car truck having a bolster, a pair of side frames and a damping system for relative bolster/side frame movement using a side spring supported friction wedges, for optimized lateral warp friction moment and low damping force includes the simultaneous equations: ##EQU12##where:.theta. is the angle defined between the vertical and sloping surfaces of the friction wedges and P is the side spring force;Fw.sub.W.E. is the required warp friction force--worn--empty;.mu..sub.2w is the slope warp coefficient--max:.mu..sub.1w is the column warp coefficient--max;a is the bearing centers;b is the wheelbase;w.sub.w is the wedge width;V.sub.c,/W.E is the maximum compression damping force per suspension--empty;.mu..sub.1d is the column damping coefficient;.mu..sub.2d is the slope damping coefficient.