| 摘要 |
The invention relates to a safety support (10) to be mounted on a rim (6) inside a tire (7) of a vehicle. Said support is provided for supporting the tread of the tire in case of inflation pressure loss and comprises a substantially cylindrical base (2), to be fitted around the rim, a top (30) with a radially outer wall, for contacting the inner wall (73) of the tire crown in case of pressure loss, a clearance being maintained in relation to said inner wall at the nominal operating pressure of the tire and an annular body (4), linking the base and the top. Said invention is characterised in that, taking E as the defined revolution surface of common axis X with the support, said support being mounted on the service rim thereof, in any axial plane through a contact zone between the support and the tire when running flat, through the circle having a radius equal to the radius of the point of the support top outer wall, which is the furthest from the axis X and taking f as the deflection of the support, mounted on the service rim thereof and under a load Z which is the nominal load for the tire, said surface E is circumscribed between two revolution cylinders of radii Rmax et Rmin, satisfying the following relationship: 0.2f < Rmax - Rmin < 2f. |
