Patent ID: 8511238

Claim:
A steerable truck for a railway car having a truck frame which rotatably supports a front wheelset positioned on a front side of the truck frame in a direction of travel and a rear wheelset positioned on a rear side in the direction of travel through axle boxes, and a truck frame steering unit for controlling the steering angle of at least the rear wheelset when traveling along a curved track in the direction of travel, characterized in that when the truck is traveling along a curved track, the truck frame is steered so as to be aligned with the tangential direction of the curved track by controlling the steering angle of the rear wheelset by the truck frame steering unit so that the steering angle of the rear wheelset is larger than the steering angle of the front wheelset wherein control of the steering angle of the rear wheelset by the truck frame steering unit is carried out by a link mechanism mounted on the truck frame, the link mechanism further comprising: (1) a pair of first links; (2) a pair of steering levers, each of which connects the car body and the truck frame; (3) and a pair of second links, each of which connects the steering lever and an axle box that rotatably supports the rear wheelset, and first connection points, each of which connecting the first link and the steering lever of pairs (1) and (2) and being used as a fulcrum, second connection points, each of which connecting the steering lever and the second link of pairs (2) and (3) and being used as a point of effort, and third connection points, each of which connecting to the truck frame and being used as a point of load, so that the truck frame is steered such that the steering angle of the rear wheelset is larger than the steering angle of the front wheelset.