Motor-vehicle wheel structure having a main disc and an auxiliary disc

摘要

A motor-vehicle wheel structure comprises a wheel rim (2) and a wheel disk (3) having a circumferential border (3a) bent and welded within the rim (2), and a central portion (3b) bearing a circumferential series of holes (3d) for engagement of bolts for fixing the wheel to the wheel support. The central portion (3b) is radiused to the circumferential border (3a) of the disk (3) by means of an intermediate annular portion (3e) having in cross section an arched configuration projecting outwards. Welded on the outer face of the wheel disk (3) is an auxiliary disk (4) having a substantially plane conformation, the outer border of which is welded to the main disk (3) substantially in a position corresponding to the apex of the aforesaid projecting annular portion (3e). The auxiliary disk (4) integrates tubular columns (4b) that project from the inner face of the auxiliary disk (4) and have their ends welded to the central portion (3b) of the main disk (3) so that they are co-axial to the holes (3d) for the fixing bolts.