| 摘要 |
A supplementary and/or backup wheel system for an automobile, comprising a means (57) for lifting the automobile in the area of a wheel hub from ground (G) and an operation member, such as a spare wheel (31), an agricultural tool, like a plow, a traction aid or the like, for operatively contacting ground wherein said lifting means (57) is rigidly mountable to the wheel hub (3) defining a rotation axis (R), characterized in that said lifting means (57) is formed by a rim portion (59) defining a cam periphery (61) which has a minimum rotation axis distance continuously increasing to a maximum rotation axis distance and lifts the automobile when rolling on ground (G), and particularly at least one part of the operation member is rigidly mountable to the wheel hub (3) of the automobile such that the at least one part can be turned from a passive ground-non contacting operation mode when said cam periphery is rolling on ground (G), to an active operation mode in which said at least one part of the operation member comes in operative contact with ground (G) after the automobile is lifted.
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