Motorized swiveling streetcar trucks

A motor powered swivel truck for rail vehicles, especially for streetcars, comprising a welded swivel truck frame having a pair of wheel axles, a cradle frame, a spring system and a sway stabilizing means

• A. said swivel frame comprising two longitudinal members, the end portions of which have a closed profile and lie at a higher level than the middle portion, said middle portion having an open profile, a pair of cross members welded to said longitudinal members to define a quadrangle where the middle portions of said longitudinal members have the lower level, said longitudinal members having an upper flange extending laterally and running longitudinal thereof, said upper flange being bent downwardly, said cross members having a lower laterally extending flange, said upper flange of said longitudinal member being welded to said lower flange of said cross member at the point at which said upper flange is bent downwardly through a stiffening sheet disposed within said quadrangle, said stiffening sheet being welded to said upper and lower flanges;
• B. the end portions of said longitudinal member having recesses for receiving wheel bearings;
• C. said spring system disposed between said swivel truck frame and said cradle frame and comprising a pair of coil springs, one on each side of said truck and disposed within each of said springs a supplementary spring of rubber-elastic material, and disposed within each of said coil springs and between said cradle frame and said swivel truck frame a block of rubber-elastic material having a height less than the normal relaxed height of said coil springs;
• D. said sway stabilizing means comprising a torsion rod disposed rotatably at said cradle frame transversely of the direction of travel of said truck the ends of which are connected to horizontally disposed levers rigidly mounted, said horizontally disposed levers each having a free end, said free ends each connected to a vertical member, said vertical member connected to said swivel truck frame;
• E. said cradle frame having a central receiver for receiving a connector attached to a car body, a pair of motors having output shafts, the housings for said motors suspended on one side from a longitudinal member.

A motor powered swivel truck for rail vehicles, especially for streetcars, comprising a welded swivel truck frame, a cradle frame, a spring system and a sway stabilizing means

• A. said swivel frame comprising two longitudinal members, the end portions of which have a closed profile and lie at a higher level than the middle portion, said middle portion having an open profile, a pair of cross members welded to said longitudinal members to define a quadrangle where the middle portions of said longitudinal members have the lower level, said longitudinal members having an upper flange extending laterally and running longitudinal thereof, said upper flange being bent downwardly, said cross members having a lower laterally extending flange, said upper flange of said longitudinal member being welded to said lower flange of said cross member at the point at which said upper flange is bent downwardly through a stiffening sheet disposed within said quadrangle and welded to said upper and lower flanges;
• B. the end portions of said longitudinal member having recesses for receiving wheel bearings;
• the end portions of said longitudinal members being shaped in their upper parts as box girders, each of said recesses accomodating a wheel set bearing including a bearing and a housing therefore, each of said wheel set bearings having two lateral arms on which the end of the longitudinal members is supported;
• C. said spring systems comprising a pair of coil springs disposed between said swivel truck frame and said cradle frame;
• D. said sway stabilizing means comprising a torsion rod disposed rotatably at said cradle frame transversely of the direction of travel of said truck, the ends of which are connected to horizontally disposed levers rigidly mounted, said horizontally disposed levers each having a free end, said free ends each connected to a vertical member, said vertical member connected to said swivel truck frame;
• E. said cradle frame comprising a central receiver for receiving a connector attached to a car body, a pair of electric motors having output shafts, said motor disposed on said cradle from such that said output shafts are parallel to the wheel axles the housings for said motor suspended on one side on a longitudinal member.

A motor powered swivel truck for rail vehicles, especially for streetcars, comprising a welded swivel truck frame, a cradle frame, a spring system and a swivel stabilizing means and a pair of electric motors wherein:

• A. said swivel truck frame comprises a pair of longitudinal members each of which has end portions having a closed profile, each of which longitudinal members has a middle portion, said end portions disposed at a level higher than said middle portions, a pair of cross members welded to said longitudinal member at the point at which said end portions of said longitudinal members begin to form into the middle portion to define a quadrangle, said cross members having an upper flange between said longitudinal members which is bent downwardly, said cross members having a generally I-shaped profile between said longitudinal members, said longitudinal members having laterally extending upper flanges welded to lower edges of the flange of said I profiles, by a stiffening member disposed within said quadrangle and welded to said upper and lower flanges;
• B. the end portions of said longitudinal member having recesses for receiving wheel bearings;
• C. said spring system comprising a coil spring on each side of said truck disposed between said swivel truck frame and said cradle frame;
• D. said sway stabilizing means comprising a torsion rod disposed rotatably at said cradle frame transversely of the direction of travel of said truck, the ends of which are connected to horizontally disposed levers rigidly mounted, said horizontally disposed levers each having a free end, said free ends each connected to a vertical member, said vertical member connected to said swivel truck frame;
• E. said cradle frame comprising a central receiver for receiving a connector attached to a car body, a pair of electric motors having output shafts, said motor disposed on said cradle such that said output shafts are parallel to the wheel axles, the housings for said motor suspended on one side on a longitudinal member.