Abstract: A metal sheet ring (5) has a web (15) extending between two fins (10) and (11) projecting towards a carrier hoop (6), wherein free ends of the fins rest on and couple to respective annular seats (8) and (9) defined in an internal face of the carrier hoop, the free ends being sealed by respective annular welding beads (14) to form an internal annular cooling tube (3) having an inside surface constituted by the metal sheet ring and the inside surface (7) of the carrier hoop.

Abstract: The mounting consists of a metal sheet ring, which cross section is substantially like a “U”, wherein the free ends of the “U” branches rest and couple to the annular seats being defined in the inside face of the carrier hoop, matching their curbs of internal edge; wherein said support and coupling are sealed by respective annular welding beads extending along the mentioned annular seats and rest on the body of the carrier hoop, being conformed an inside annular cooling tube which inside surface is constituted by a metal sheet ring and the inside diametrical surface of the carrier hoop extending between said two annular seats.