A front suspension system for a motorcycle wheel

Claim 1

A suspension system for a motorvehicle wheel, particularly for a motorcycle wheel, comprising on at least one and preferably on both of the sides of the wheel (9), two sub= stantially upright swinging arms (11, 12) disposed in a plane substantially parallel to the plane of the wheel and pivoted at their upper ends to a supporting structure (6) of the vehicle and at their lower ends to a wheel-carrying element (10), so that the supporting structure (6), the two swinging arms (11, 12) and the wheel-carrying element (10) form an articulated quadrilateral, the wheel-carrying element (10) having a prolongation (110) which is parallel to the plane of the wheel and extends forward or backward beyond the two pivotal connections (211, 212) between the two swinging arms (11, 12) and the wheel-carrying element (10), with the wheel (9) being mounted on the said prolon= gation (110) and with at least one resilient means (16) and at least one shock absorber (15) acting on the said articulated quadrilateral to oppose relative movement bet= ween the supporting structure (6) and the wheel-carrying element (10) due to a load applied to the motorvehicle, characterized in that the wheel axle (8) is pubs tantially located on an ideal straight line (13) passing through the pivotal connections (211, 212) of the two swinging arms (11, 12) to the wheel-carrying element (10) or slightly above or below the said straight line (13), while the shock absorber (15) has its upper end pivoted either directly or indirectly to the supporting structure (6), or to one of the swinging arms (11, 12), and has its lower end pivoted either directly or indirectly to the wheel-carrying element (10), at a position (215) located below the ideal straight line (13) passing through the pivotal connections (211, 212) of the two swinging arms (11, 12) to the wheel-carrying element (10), within an area substantially included between the median perpendicular (17) to the segment between the pivotal connections (211, 212) of the two swinging arms (11, 12) to the wheel-carrying element (10) and the median perpendicular (18) to the segment between the axle (8) of wheel (9) and the pivotal connection (211) of the swinging arm (11), which is nearer to the wheel axle (8), to the wheel-carrying element (10).