Run-flat tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorSusumu Tanaka
Life of this patent
Estimating the term…
Abstract
A run-flat tire comprises a tread portion having a left-right asymmetry tread pattern including an inboard tread edge and an outboard tread edge defining a tread width therebetween, a circumferentially extending inner crown main groove disposed in an inner crown area being 20% width of the tread width from a tire equator toward the in-board tread edge, a plurality of inner lateral grooves extending from the inner crown main groove to the in-board tread edge, a plurality of inner blocks separated by the inner crown main groove, inner lateral grooves and the inboard tread edge, wherein each inner block is not provided with any circumferential grooves, or is provided with at least one narrow circumferential groove having a groove width of less than 2.0 mm.
Claims9
A run-flat tire comprising
- a tread portion having a left-right asymmetry tread pattern including an inboard tread edge and an outboard tread edge defining a tread width therebetween;
- a circumferentially extending inner crown main groove disposed in an inner crown area being 20% width of the tread width from a tire equator toward the in-board tread edge;
- a plurality of inner lateral grooves extending from the inner crown main groove to the in-board tread edge;
- and
- a plurality of inner blocks separated by the inner crown main groove, inner lateral grooves and the inboard tread edge,
- wherein
- each inner block is not provided with any circumferential grooves,
- each inner block is provided with a sub lateral groove and a slit, the sub lateral groove extending from the inboard tread edge in parallel with inner lateral grooves to an axially inner end terminating within the inner block,
- the slit has an axially outer end separated from the inner end of the sub lateral groove,
- the slit extends in parallel with inner lateral grooves from the axially outer end to an axially inner end terminating within the inner block, and
- the slit has a width gradually reducing toward the inner crown main groove.
A run-flat tire comprising
- a tread portion having a left-right asymmetry tread pattern including an inboard tread edge and an outboard tread edge defining a tread width therebetween,
- a circumferentially extending inner crown main groove disposed in an inner crown area being 20% width of the tread width from a tire equator toward the inboard tread edge,
- a plurality of inner lateral grooves extending from the inner crown main groove to the inboard tread edge,
- a plurality of inner blocks separated by the inner crown main groove, inner lateral grooves and the inboard tread edge, wherein
- each inner block is provided with at least one narrow circumferential groove having a groove width of less than 2.0 mm,
- each inner block is provided with a sub lateral groove and a slit, the sub lateral groove extending from the inboard tread edge in parallel with inner lateral grooves to an axially inner end terminating within the inner block,
- the slit has an axially outer end separated from the inner end of the sub lateral groove,
- the slit extends in parallel with inner lateral grooves from the axially outer end to an axially inner end terminating within the inner block, and
- the slit has a width gradually reducing toward the inner crown main groove.
Dependencies are inferred from the claim text.