| 摘要 |
<p>A pneumatic radial ply passenger tire (10) having a tread (20), a casing with two sidewalls (14, 16), one or more radial plies (18) extending from and wrapped about two annular beads (13) and a belt reinforcement structure (15) located radially between the tread and the plies. The tread has a central rib (50) with a first contour-defining curve extending outwards from the centerline of the tire towards the sidewalls and a pair of side ribs (60) each having a second contour-defining curve disposed between the central rib and the sidewalls. The first and second contour-defining curves each have first and second radii disposed such that the meeting point (72) of first and second adjacent contour-defining curves cannot contain a single line that is mutually tangential to the first and second adjacent contour-defining curves. First and second circumferential decoupling grooves (22) are disposed on either side of the centerline at the meeting point of the first and second adjacent contour-defining curves and define a circumferential line at the bottom of the grooves which is a region of greater flexibility than the adjacent sections of the tire tread to decouple sidewall bending stresses from the central rib.</p> |
