Patent ID: 11904640
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A pneumatic tyre and rim assembly comprising:
a pneumatic tyre and a standard wheel rim on which the pneumatic tyre is mounted, wherein the pneumatic tyre comprises:
a pair of bead portions having respective bead cores therein, each bead core defining a core innermost end in a tyre radial direction and a core outermost end in a tyre axial direction;
an inner liner having an air-impermeable property and extending between the pair of bead portions; and
a carcass ply comprising a main portion extending between the bead cores of the pair of bead portions, and a pair of turn-up portions turned up around the respective bead cores from axially inside to outside of the tyre,
wherein
in each of the pair of bead portions, the inner liner comprises an innermost end in the tyre radial direction located inwardly of the core innermost ends in the tyre radial direction,
the pair of bead portions has a bead base diameter being less than 99.7% of a rim diameter of the standard wheel rim,
in at least one of the pair of bead portions, the inner liner comprises a first extension member that extends outwardly in the tyre axial direction through inwardly of the bead core in the tyre radial direction and a second extension member,
the first extension member of the inner liner extends beyond the core outermost end outwardly in the tyre axial direction,
the second extension member extends outwardly in the tyre radial direction from an axially outer end of the first extension member,
an outermost end in the tyre radial direction of the second extension member of the inner liner is located outwardly in the tyre radial direction of a bead base line,
the second extension member is exposed at an axially outer end of an outer surface of the at least one of the pair of bead portions,
in a radially inner region of the bead core in the at least one of the pair of bead portions, a tie gum layer is disposed between the first extension member of the inner liner and the carcass ply,
the tie gum layer extends outwardly in the tyre axial direction with respect to a middle-width position of the bead core in the tyre axial direction, and
an outermost end in the tyre axial direction of the tie gum layer is located inwardly in the tyre axial direction with respect to the core outermost end of the bead core in the tyre axial direction.