Patent ID: 7232180
Filing Date: 2007-06-19
Classification: B62D,F16F

Abstract:
1. A suspension system for the cab of a lorry or truck vehicle comprising: at least one arm mounted oscillating on a chassis of the lorry or truck and connected to the structure of the cab; and elastic means and shock-absorbing means operatively set between the oscillating arm and the chassis of the lorry or truck, said system wherein said shock-absorbing means comprise a fluid rotational damper, wherein said rotational damper is of the type that uses a magneto-rheological fluid, comprising: an external casing; a blade piston mounted oscillating in the cavity inside the casing, which defines two operative chambers that communicate with one another through passages made in the blade piston, wherein the aforesaid elastic means are constituted by a leaf spring having a part for attachment to the chassis of the vehicle and an end co-operating with said oscillating arm, wherein the system comprises a front suspension and a rear suspension, at least one of which being provided with the aforesaid rotational damper, wherein the front suspension comprises a pair of longitudinal arms mounted oscillating about one and the same axis transverse to the longitudinal direction of the vehicle, and connected at their free ends to the opposite ends of a transverse torsion bar, the structure of the cab of the vehicle being mounted so that it can turn about said torsion bar to enable tipping-up of the cab, each oscillating arm being rigidly connected to the blade piston of a respective rotational damper, and said leaf spring being set transverse to the longitudinal direction, with its central part anchored to the chassis of the vehicle and the opposite ends co-operating with the ends of the two oscillating arms underneath the latter.