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    • 3. 发明申请
    • MOTOR VEHICLE WITH TWO FRONT STEERING WHEELS AND WITH IMPROVED STEERING MECHANISM
    • WO2018172908A1
    • 2018-09-27
    • PCT/IB2018/051819
    • 2018-03-19
    • PIAGGIO & C. S.P.A.
    • RAFFAELLI, AndreaVIANELLO, AlbertoMARIOTTI, Valentino
    • B62K5/08B62K5/10B62K5/027B62K5/05
    • Motor vehicle (4), comprising: - at least one rear wheel (8), at least two front steering wheels (12, 16) and a handlebar (20), - the front wheels (12, 16) being rotatable around respective lateral steering axes (L1, L2) according to lateral steering angles (a1, a2), the handlebar (20) being rotatable according to a central steering angle (β) around a column (32) defining a central steering axis (C), - the front steering wheels (12, 16) being kinematically connected to the handlebar (20) by means of transmission means (36) that comprise a steering bar (40), pivoted, at lateral hinges (52, 56), to two lateral steering supports (44, 48), each kinematically connected to a corresponding front wheel (12, 16). Advantageously, the transmission means (36) comprise at least a first connecting rod (60) which rotatably connects a centerline (M-M) of the steering bar (40) with the steering column (32), around the central steering axis (C). The first connecting rod (60) is hinged through a first pivoting hinge (64) about a pivoting axis (B-B) rotating integrally with the handlebar, lying on a plane perpendicular to the central steering axis (C) and not incident with the central steering axis (C). The transmission means (36) comprise relative roto-translation means (68) between the first connecting rod (60) and the steering bar (40), along an articulation direction (T-T), so as to allow the rotation and mutual translation between the steering bar (40) and the first pivoting hinge (64).