Disc brake device for railway vehicle

A disc brake device for a railway vehicle, the disc brake device comprising:

• a rotary member to be attached to an axle of the railway vehicle;
• a brake disc including a disc body having an annular shape and a plurality of fins, the disc body having a rear surface that faces the rotary member, the plurality of fins being disposed on the rear surface in a radial shape;
• a control member including a base plate and a protruding portion, the base plate being sandwiched between the rotary member and the plurality of fins, the protruding portion protruding from the base plate toward the disc body, and being positioned between, among the plurality of fins, fins disposed adjacent to each other in a circumferential direction of the brake disc, the control member being configured to control an airflow rate between the fins disposed adjacent to each other;
• and
• a fastening member configured to fasten the brake disc and the control member to the rotary member, wherein
• at least one of the plurality of fins has a first fastening hole including a large diameter portion and a small diameter portion, a head portion of the fastening member being disposed in the large diameter portion, the small diameter portion having a diameter smaller than a diameter of the large diameter portion, a shaft portion of the fastening member being inserted through the small diameter portion,
• the base plate has a through hole that is provided corresponding to the first fastening hole and through which the shaft portion is inserted, and
• a peripheral edge of the through hole is entirely axially disposed between the rotary member and the brake disc, and has a larger diameter than the diameter of the small diameter portion of the first fastening hole.