| 摘要 |
<p>A tyre and wheel rim assembly for a vehicle, the tyre (1) comprising a pair of bead regions each reinforced by a bead core (5) and the wheel rim (2) comprising a pair of bead seats (6,7) characterised by one bead region of the tyre having an additional retention zone (18) positioned axially inwards of and integral with the main bead region, the retention zone (18) having an axially inner tip or toe (21) substantially inwards of the main bead region and the construction of the bead between the bead core (5) and tip (21) providing substantial resistance to compressive forces therebetween, and the wheel rim (2) comprises axially inwards of and adjacent to one of the bead seats (6,7), which is that part of the bead seat contacted by a standard tyre, a circumferentially extending toot (21) having a sharp edge inter-engaging only the retention zone (18) of the tyre at the tip (21) such that when lateral force is applied to the tyre tread and internal inflation pressure is low, axially inward movement of the tip (21) is resisted by tip-to-tooth inter-engagement thus causing bead rotation about the tip (21) and generation of compression force in those parts of the bead region between the tip (21) and the core (5) to provide bead retention at the bead seat. The invention also provides a wheel rim and a tyre having the above features. <IMAGE> <IMAGE></p> |
