manufacturing method of structures, particularly in light alloy, particularly casting in sand, for wheels to lightness, strength and aerodinamicita is driven.particularly for motorcycle racing and structures obtained by this process and wheels

摘要

In structures, particularly made of light alloy, particularly castings in sand for light, strong wheels with extreme aerodynamics, particularly for competition motorcycles, the structural thicknesses, which went from 5 mm average tyre rim thickness to 5.5 mm average thickness of the spokes, have been reduced, to 4 mm and 4.5 mm respectively, with a considerable reduction of 1 mm, extended to all the walls of the structure of the wheel. The lap, between the tyre rim and the spokes takes place according to a section with entry and exit edges, mainly tapered, rhomboidal, with gentle, entirely gradual tapering, without a gap, both incoming and outgoing. The section of the lap presents angles of inclination of about 15 degrees and an increase between 0 and 28 mm, distributed over 110 mm, with an average gradient of 50%, encompassing an area of about 15.5 cm2. The lap on the wheel hub, in section, has a downwards pulling, symmetrical outline, therefore with a preferred direction of travel and concerns an area of the wheel hub, which is less than that of the tyre rim by about 20%.