FORECARRIAGE OF A ROLLING MOTOR VEHICLE WITH ROLL BLOCK

The present invention relates to a forecarriage of a rolling motor vehicle with three or four wheels, comprising: a forecarriage frame ; at least one pair of front wheels ″ kinematically connected to each other and to the forecarriage frame by a kinematic roll mechanism which enables the same to roll in a synchronous and specular manner; a roll control system comprising a rod having a first and a second end opposite each other which connect by means of hinging means ″ and 102′, 102″ a first and a second anchoring portion of forecarriage directly to each other. At least one of said first and second anchoring portions is subject to roll movements of said two front wheels ′. The hinging means ″ and ″ are configured to passively follow the movements of said two anchoring portions. The hinging means ″ at the first end of the rod comprise at least a first roll hinge ′ which has its hinge axis substantially orthogonal to a rolling plane of the two front wheels and is connected to the first anchoring portion . The roll control system comprises a first damper device suitable to dampen—in a predetermined angular range—the rotation movements of said rod with respect to said first roll hinge at the first end . Said angular range corresponds to the angular roll range of the rod. Said first damper device comprises a connecting rod-crank kinematic mechanism which is connected to rod at the connecting rod by means of a first cylindrical hinge , and to said first anchoring portion at crank by means of a second cylindrical hinge so as to define an articulated quadrilateral. The connecting rod is connected to the crank by means of a cylindrical articulation hinge . Such three hinges and all have a hinge axis parallel to the hinge axis of the first roll hinge ′. The connecting rod is engaged in the articulation hinge or in the first hinge with an axial mobile coupling. The crank consists of an axial damper or comprises an axial damper , which is arranged coaxially to the crank and has a predetermined axial stroke. Said first damper device further comprises an actuator which is suitable to impart an axial shift movement to the connecting rod relative to the articulation hinge or to the first hinge to vary the distance H defined between such two hinges. The actuator is operable to vary such a distance by rotating the crank around the second hinge and thus varying the configuration of the connecting rod-crank kinematic mechanism between: a damped rolling configuration, in which the connecting rod is aligned with the crank and said articulated quadrilateral is degenerated into a triangle thus defining an extensible strut countering the rotation of the rod within said predetermined angular range, said strut having an axial excursion which corresponds to said axial stroke and in turn defines said predetermined angular roll range of the rod; and—at least one free rolling configuration, wherein the connecting rod is misaligned with respect to the crank and said articulated quadrilateral has a non-degenerate configuration which leaves the rolling movements free. The first damper device further comprises an actuator which is suitable to impart an axial shift movement. The first damper device further comprises release means to assist the actuator in the passage from the dampened roll configuration to at least one free roll Such release means are configured to impress on the crank a release rotation around the second hinge such as to trigger a misalignment between the crank and the connecting rod.