Friction wedge design with opitmum high stick friction torque and low damping force

Application Number: 00108216
Application Date: 2000.04.30
Publication Number: 1273195
Publication Date: 2000.11.15
Priority Information: 1999/5/6 US 09/306,300
International: B61F5/12
Applicant(s) Name: Standard Mobile Inc.
Inventor(s) Name: Amand P. Tarong
Patent Agency Code: 11038
Patent Agent: zheng xiuzhe
Abstract 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 of each side spring are defined by a pair of simultaneous equations.