Motorized swiveling streetcar trucks

摘要

A motorizable swivel truck for rail vehicles, especially streetcars, having a truck frame on which a cradle frame lying transversely of the direction of travel is supported by at least one coil spring, and the car body rests upon the cradle frame through a support means which permits wide swiveling of the swivel truck. The coil truck frame consists of two longitudinal members having a generally underslung configuration and whose middle portion has a level lower than the level of either end of each longitudinal member. The longitudinal members have end portions which have a closed profile while the middle portion has an open profile. The swivel truck frame comprises two cross members which are disposed between the wheel axles and may also have a cross-sectional open profile. The ends of the cross-sectional members are connected to the longitudinal members suitably by being welded to the same. Owing to the underslung and arched configurations and the specific construction the swivel truck frame is flexible so that the wheel bearings may be mounted with stiff springing of the end portions of the longitudinal members. The device can also have a motor or pair of motors suspended on the cross members in such a manner that the drive shaft of the motors lies parallel to the direction of travel, the driving of the wheel axles being performed through a bevel or spur gear transmission.