Tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKae Ito
Life of this patent
Estimating the term…
Abstract
A tire comprises a tread portion 2 comprising blocks 20. At least one of the blocks has a first block wall (25a), a second block wall (25b), and a first region (26a) and a second region (26b) divided by a crossing sipe 30. In a plan view, the first and second block walls (25a) and (25b) are each formed in a convex V-shape so as to have an apex portion 27 protruding toward the outside of the block. The crossing sipe 30 has a first end (28a) positioned on a first side of the apex portion 27 of the first block wall (25a) and a second end (28b) positioned on a second side of the apex portion 27 of the second block wall (25b) in the tire circumferential direction. The first and second regions (26a) and (26b) each have a closed sipe 38 having both ends terminating within the region.
Claims18
A tire comprising:
- a tread portion comprising
- a plurality of main grooves extending continuously in a tire circumferential direction,
- a crown land region defined between a pair of the main grooves adjacent to each other,
- a plurality of crown blocks divided by a plurality of crown lateral grooves connecting between the pair of the main grooves,
- a middle land region defined between another pair of the main grooves adjacent to each other,
- a plurality of middle blocks divided by a plurality of middle lateral grooves connecting between the another pair of the main grooves,
- the crown blocks and the middle blocks each having a first block wall and a second block wall abutting on the main grooves on both sides of the block, and being provided with a crossing sipe extending between the first block wall and the second block wall so as to have a first end thereof connected with the first block wall and a second end thereof connected with the second block wall, and a first region and a second region divided by the crossing sipe and positioned on both sides thereof in the tire circumferential direction, wherein
- in a plan view of each of the blocks each of the crown blocks and the middle blocks,
- the first block wall and the second block wall are each formed in a convex V-shape so as to have an apex portion protruding toward the outside of the block,
- the crown blocks include
- first crown blocks whose crossing sipes each have the first end positioned on a first side in the tire circumferential direction of the apex portion of the first block wall and the second end positioned on a second side in the tire circumferential direction of the apex portion of the second block wall, and
- second crown blocks whose crossing sipes each have the first end positioned on the second side of the apex portion of the first block wall and the second end positioned on the first side of the apex portion of the second block wall,
- in each of the middle blocks, the first end of the crossing sipe is positioned on the second side in the tire circumferential direction of the apex portion of the first block wall and the second end of the crossing sipe is positioned on the first side in the tire circumferential direction of the apex portion of the second block wall,
- each of the first region and the second region is provided with a closed sipe having both ends terminating within the region,
- in each of the crown blocks, the closed sipe provided in the first region and the closed sipe provided in the second region do not overlap each other in a tire axial direction,
- in each of the middle blocks, the closed sipe provided in the first region and the closed sipe provided in the second region overlap each other in the tire axial direction,
- each of the crossing sipes comprises
- a first portion extending from the first end in a wavy shape in the tire axial direction,
- a second portion extending from the second end in a wavy shape in the tire axial direction, and
- a third portion extending straight between the first portion and the second portion, the closed sipes extend in wavy shapes, and
- the third portion is inclined at a larger angle than center lines of amplitudes of the wavy shapes of the closed sipes with respect to the tire axial direction.
Dependencies are inferred from the claim text.