Patent ID: 7481729
Filing Date: 2009-01-27
Classification: B62M,F16H

Abstract:
1. A motorcycle sprocket, consisting of a central portion ( 1 ) made from a metal alloy and having pocket recesses ( 13 ), to which a peripheral toothed portion ( 2 ) made from ferrous alloy and having radial beams ( 21 ), is joined, using rivets ( 3 ) for joining said portions ( 1 , 2 ), which rivets are made of titanium alloy or stainless steel alloy and where said joining is created between said radial beams ( 21 ) of the peripheral toothed portion ( 2 ) and said pocket recesses ( 13 ) in the central portion ( 1 ), said radial beams ( 21 ) being overlapped across bottoms of pocket recesses ( 13 ), and where a thickness of said radial beams ( 21 ), at least over the joining area, is decreased by 10 to 60%, in relation to the full thickness of said toothed peripheral portion ( 2 ), and a thickness of a bottom of said pocket recesses ( 13 ) in the central portion ( 1 ) is decreased by 20 to 70%, in relation to full thickness of the central portion ( 1 ) of the sprocket, characterized in, that a centering of the peripheral toothed portion ( 2 ) in relation to the central portion ( 1 ) acts over an outer circumference of the central portion ( 1 ) of said sprocket and that a side clearance between the radial beams ( 21 ) of the peripheral toothed portion ( 2 ) and side walls of the pocket recesses ( 13 ) of the central portion ( 1 ) is created, said clearance being 0.5 to 10% of the rivet ( 3 ) shank diameter.