Patent ID: 8794398

Claim:
A brake disc for a railway vehicle in which a ring-shaped plate portion defining a circumferential direction and with a front side serving as a frictional surface is provided and a plurality of fins are projected and disposed radially on a back side of said plate portion, each fin having a first radially inward end face and a second radially outward end face, each the first radially inward end face and the second radially outward end face extending in the circumferential direction, said plate portion being fixed to a wheel, wherein a plurality of ribs is provided, each rib being provided between every pair of adjacent fins, each rib having a length extending in the circumferential direction with first and second opposing side faces extending in the circumferential direction, each rib having a constant width along a circumferential length thereof, the first opposing side face spaced radially outward from the first radially inward end face and the second opposing side face spaced radially inward from the second radially outward end face, and a plurality of slits is provided, each slit being disposed in a circumferentially intermediate portion of each of the plurality of ribs, and each slit having a trapezoidal shape when viewed in a radial direction, developing in the direction from a wheel-side face of each of the plurality of ribs toward the back-side of said plate portion.