Abstract: The invention concerns an undercarriage (35) for a vehicle comprising a chassis, two front steering wheels (36D, 36G) and at least one rear drive wheel. The undercarriage comprises, combined with each wheel, a suspension system (39) suspending the wheel from said chassis, said system (39) comprising an upper suspension arm (40), a lower suspension arm (41) and a lateral arm (42), said arms being linked together by articulated means (43, 44, 45, 46) such that a lateral tilting of the undercarriage results in an equivalent tilting of the two front wheels, which remain parallel to each other. According to a feature of the invention, the undercarriage comprises a damper (50), integral with each front wheel, to at least partially cancel the oscillation frequencies of said front wheel.

Abstract: The invention concerns an undercarriage (35) for a vehicle comprising a chassis, two front steering wheels (36D, 36G) and at least one rear drive wheel. The undercarriage comprises, combined with each wheel, a suspension system (39) suspending the wheel from said chassis, said system (39) comprising an upper suspension arm (40), a lower suspension arm (41) and a lateral arm (42), said arms being linked together by articulated means (43, 44, 45, 46) such that a lateral tilting of the undercarriage results in an equivalent tilting of the two front wheels, which remain parallel to each other. According to a feature of the invention, the undercarriage comprises a damper (50), integral with each front wheel, to at least partially cancel the oscillation frequencies of said front wheel.

Abstract: A valve and a device for actuating the rotation of a stand (4) of a motorcycle (2) comprising an hydraulic actuator (1) operating an actuating member (7) between a first and a second position bringing the stand (4) from a rest position (A) to a supporting position (B). A flow control hydraulic circuit (12-25) is provided allowing the return stroke of the actuating member (7) to the first position leaving the stand in the supporting position (B), whereby the stand can be brought to the rest position (A) independently from the actuating member (7). The device has the advantages that in case of lack of pressure in the hydraulic circuit the movement towards the rest position in which it remains is free as if the device does not exist. Moreover, it can be operated by a single drive and its encumbrance is minimal. Its installation on the vehicle, moreover, is not complex, and it does not have the drawback of the existing electromechanical systems.

Abstract: An actuating device (1) for the rotation of a stand (4) of a vehicle, such as a motorcycle or scooter, between a standing position and a rest position, and allowing also the reverse maneuver in order to rotate the stand from the position of vehicle on the stand up to that in which the vehicle lowers spontaneously. At least one hydraulic actuator (1) is provided that operates, between a first and a second position, an actuating member (7) or piston rod that engages with the stand (4) up to bringing it respectively from the rest position to the standing position. A flow control hydraulic circuit delivers pressurized liquid to the actuator (1) for moving the actuating member (7) from the first to the second position, and allows the back stroke of the actuating member (7) to the first position when the flow of the liquid ceases, whereby the stand (4) can be brought back to said rest position independently from the actuating member (7).

Abstract: An actuating device (1) for the rotation of a stand (4) of a vehicle, such as a motorcycle or scooter, between a standing position and a rest position, and allowing also the reverse maneuver in order to rotate the stand from the position of vehicle on the stand up to that in which the vehicle lowers spontaneously. At least one hydraulic actuator (1) is provided that operates, between a first and a second position, an actuating member (7) or piston rod that engages with the stand (4) up to bringing it respectively from the rest position to the standing position. A flow control hydraulic circuit delivers pressurized liquid to the actuator (1) for moving the actuating member (7) from the first to the second position, and allows the back stroke of the actuating member (7) to the first position when the flow of the liquid ceases, whereby the stand (4) can be brought back to said rest position independently from the actuating member (7).