Disc brake disc with parking brake cylindrical surface

A disc brake disc with a parking brake cylindrical surface suitable for cooperating with shoes of a parking brake, wherein said disc brake disc comprises:

• a braking band comprising opposite braking surfaces and a geometric connection portion of the band connecting the braking band to a bell;
• said bell comprising a connection plate with a wheel hub and an annular geometric connection portion of the bell connecting the bell to the geometric connection portion of the band;
• said braking band and said bell being separate pieces from each other and geometrically coupled to each other by said geometric connection portion of the band and said geometric connection portion of the bell so as to transfer a braking action exerted by a brake caliper on said opposite braking surfaces from said braking band to said bell and thus to said wheel hub;
• said bell comprising a bell connection surface opposite to said braking band;
• and wherein
• said disc brake disc further comprises a parking ring wherein an inner portion of said parking ring is delimited in a radial direction by the parking brake cylindrical surface and wherein the parking brake ring is delimited in an external radial direction by a ring connection portion;
• wherein a radially outer surface of said parking ring only touches a radially inner surface of said bell, and a radially outer surface of said bell only touches a radially inner surface of said braking band so that said parking ring does not touch the braking band,
• said ring connection portion being coupled to said bell connection surface to transfer a parking braking action exerted by the shoes on the parking brake cylindrical surface to said bell and thus to the wheel hub.