Steering group of a motor vehicle and motor vehicle thereof

Steering group of a motor vehicle comprising:

• a front frame fitted with a steering tube rotatably housing a steering shaft or pin, which rotates around a steering axis,
• the front frame being fitted with an upright integral with said steering tube,
• the front frame comprising a steering bracket, joined in rotation with the steering shaft (24), and
• elastic return means which elastically influence the steering shaft to position itself centrally with respect to the front frame, said elastic return means being placed and mechanically connected between the upright and the steering bracket in order to exert an elastic return action when the steering shaft rotates with respect to said central symmetrical position,
• wherein such elastic return means have a regressive trend elastic response, wherein the stiffness of the elastic return means decreases as the displacement of the steering shaft from said central position increases,
• wherein said elastic return means comprise a first attachment point of the elastic return means to the steering bracket and a second attachment point to the upright of the elastic return means,
• wherein the elastic return means comprise a sheath and a piston provided with a stem sliding with respect to a seat delimited by said sheath, the piston and the sheath being each integral with one of said attachment points and wherein between the stem and the seat at least one spring is interposed so that the center-to-center distance or distance between the attachment points is variable as a function of the compression of said spring,
• wherein the sheath creates an outer casing of closure and stiffening for the elastic return means.