Fabricated disc brake rotor assembly

A rotor for a disc brake assembly comprising

• first and second annular members;
• said first annular member having an annular disc portion and integrally formed fins extending from one side of said disc portion;
• the fins being spaced circumferentially about a central axis of the annular member;
• the opposing side of said annular disc portion being flat;
• said second annular member having an annular disc portion positioned substantially parallel to said disc portion of said first annular member;
• a plurality of fins integrally formed with said second member extending from one side of said annular disc portion of said second member;
• the opposing side of said disc portion of said second member being flat;
• said fins of said second member being spaced circumferentially about a central axis of the annular member;
• said fins of the first and second members extending toward each other with a plurality of said fins of said first member being aligned with a plurality of said fins of said second member whereby a plurality of pairs of aligned fins are formed;
• within each said pair of aligned fins said fins of the first annular member extend toward and abut projections extending from said fins of said second annular member;
• projections of one fin on one annular member abut and are welded to corresponding projections on said aligned fins on the other annular member;
• each of said fins of said pairs of fins having an edge extending toward a corresponding edge of an aligned fin;
• a substantial portion of the extending edges of said fins of said pairs of fins being recessed with respect to the projections such that only the projections of one fin contacts the projections of said aligned fin and a clearance exists between said edges;
• the radially inner portion of at least one of the fins of each pair of aligned fins having a recessed shoulder;
• a central hub having a hat shaped section with the axial end of the hat shape section integrally formed with a radially extending rim extending through the gap formed between the recessed shoulder and corresponding edge of said aligned fin;
• the rim abutting and secured to a plurality of intervally spaced fins at the recessed shoulder portion and having a radially outer periphery not exceeding the outer radial extent of the shoulder portion;
• the diameter of said hat shaped section being smaller than the inner diameter of said annular member in the plane containing said annular member to form a gap therebetween to facilitate air flow from the exterior side of said hat shaped section, through the gap and about the fins;
• and
• the outwardly extending rim being convoluted such that the rim abuts intervally spaced fins of one annular member and extends through the space between the other fins with a gap between the rim and fins.