Emergency wheel attachment for a vehicle wheel

An emergency wheel attachment for a vehicle wheel having a rim and a tire arranged on the rim, the emergency wheel attachment configured to be placed onto an outside of the vehicle wheel and to enable a driving operation with a restricted tire function in an operating state in which the emergency wheel attachment is attached to the vehicle wheel, the emergency wheel attachment comprising:

• an annular mounting unit configured to mount the emergency wheel attachment on the vehicle wheel, and
• an annular tread unit configured to contact, in the operating state of the emergency wheel attachment, a road on which the vehicle wheel is intended to roll,
• wherein the annular mounting unit is provided with at least two retaining claws configured to fasten the annular mounting unit to the rim of the vehicle wheel by engaging behind a rim flange of the rim, wherein at least one of the retaining claws is radially movable relative to the mounting unit so as to change a distance of the at least one of the radially movable retaining claws from a center point of the annular mounting unit,
• wherein the annular mounting unit has an annular actuating element, rotatable about an axis of rotation coinciding with a vehicle wheel axis in the operating state of the emergency wheel attachment and forming part of a gear mechanism configured to convert a rotation of the annular actuating element into a radial movement of the at least one of the radially movable retaining claws,
• and wherein the annular mounting unit includes a drive device configured to be coupled to the annular actuating element and the actuation of which causes a rotation of the annular actuating element.