Flat running device for automobile and mounted assembly including same

A run-flat device for a motor vehicle wheel rim of the one-piece asymmetric type with a circumferential rim well, the device being configured to be wedged in said rim well and to support a tire cover mounted on the rim following a drop in inflation pressure inside the tire, this device comprising:

• an annular support structure which comprises a ring that has a radially external support face intended to support the cover under run-flat conditions, and
• at least one annular clamping belt circumferentially clamping the ring in such a way as to keep it substantially in contact with the rim during running,
• at least one radial indentation being formed circumferentially in said support face, said or each clamping belt being applied to this indentation and being radially set back from said support face,
• wherein said support structure comprises wedging means configured for wedging it in said rim well while mounting it bearing against at least one side wall of said well, a radially internal face of these wedging means being configured to espouse the axial profile of a bottom of said well, and wherein said wedging means comprise:
• (i) a plurality of axial wedging tabs spaced in the circumferential direction, which are fixed to said ring for example by clipping or bonding, each wedging tab having on one of its sides an axial protrusion intended to press against said side wall of said rim well, or
• (ii) an annular sole of which the radially internal face is intended to espouse the bottom of said rim well and which on one of its sides has a circumferential axial protrusion intended to bear against said lateral wall of said rim well, said sole being surmounted by said ring without being secured thereto or with being attached thereto.