| 摘要 |
A wheel assembly for a self-propelled apparatus such as a vacuum cleaner is disclosed. The self-propelled apparatus includes a drive motor, a drive axle coupled to the drive motor, and at least one drive wheel assembly. The drive wheel assembly includes a drive member rotatably secured to the drive axle, an outer wheel casing at least partially surrounding the drive member, and a resilient coupling mechanism for establishing a rotational engagement between the drive member and the outer wheel casing after a predetermined amount of rotation of the drive member relative to the outer wheel casing.
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