Tire
A tire tread pattern includes: first sipes in a first land portion between first and second circumferential main grooves; first chamfered surfaces in which a tread surface of the first land portion is inclined toward a first circumferential main groove side in an end portion in a width direction, the first sipes opening to the first chamfered surfaces; second sipes in a second land portion on an opposite side of the first land portion with respect to the second circumferential main groove; and second chamfered surfaces in which a tread surface of the second land portion is inclined toward a second circumferential main groove side in an end portion in the width direction, the second sipes opening to the second chamfered surfaces. The first and second chamfered surfaces are greater in length in the circumferential direction than in the width direction.
1. A tire comprising a tread pattern in a tread portion, the tread pattern comprising:
a first circumferential main groove and a second circumferential main groove extending in a tire circumferential direction and disposed at an interval in a tire width direction;
a plurality of first sipes extending in the tire width direction within a region of a first land portion between the first circumferential main groove and the second circumferential main groove and disposed at intervals in the tire circumferential direction;
a first chamfered surface having a tread surface of the first land portion inclined toward the first circumferential main groove in an end portion in the tire width direction on a first circumferential main groove side of the first land portion, the first chamfered surface being provided in plurality in the tire circumferential direction, and the first sipes opening to the plurality of the first chamfered surfaces without reaching a groove wall of the first circumferential main groove;
a plurality of second sipes extending in the tire width direction within a region of a second land portion located on an opposite side of the region of the first land portion with respect to the second circumferential main groove and disposed at intervals in the tire circumferential direction; and
a second chamfered surface having a tread surface of the second land portion inclined toward the second circumferential main groove in an end portion in the tire width direction on a second circumferential main groove side of the second land portion, the second chamfered surface being provided in plurality in the tire circumferential direction, and the second sipes opening to the plurality of the second chamfered surfaces without reaching a groove wall of the second circumferential main groove;
a length in the tire circumferential direction of the first chamfered surface and a length in the tire circumferential direction of the second chamfered surface being greater than a length in the tire width direction of the first chamfered surface and a length in the tire width direction of the second chamfered surface; wherein
each of the first chamfered surface and the second chamfered surface has a substantially triangular shape that decreases in length in the tire width direction from one side in the tire circumferential direction to an other side in the tire circumferential direction.
2. The tire according to claim 1 , wherein the length of each of the first chamfered surface and the second chamfered surface in the tire circumferential direction is from 5 to 50% of a length of an interval of the first sipes or the second sipes adjacent in the tire circumferential direction, the first sipes or the second sipes opening to the chamfered surface.
3. The tire according to claim 1 , wherein a ratio of the length of each of the first chamfered surface and the second chamfered surface in the tire circumferential direction to the length of each of the first chamfered surface and the second chamfered surface in the tire width direction is greater than 1, and 10 or less.
4. The tire according to claim 1 , wherein the lengths in the tire circumferential direction of the first chamfered surface and the second chamfered surface are different from each other.
5. The tire according to claim 4 , wherein
the first chamfered surface and the second chamfered surface are disposed on one side of a tire centerline in the tire width direction, and
of the first chamfered surface and the second chamfered surface, the length in the tire circumferential direction of the one chamfered surface that is farther from the tire centerline is greater than the length in the tire circumferential direction of the one chamfered surface that is closer to the tire centerline.
6. The tire according to claim 4 , wherein ranges of positions of the first chamfered surface and the second chamfered surface in the tire circumferential direction do not overlap each other.
7. The tire according to claim 1 , wherein a maximum depth of each of the first chamfered surface and the second chamfered surface is greater than a depth of each of the first sipes and the second sipes opening to the chamfered surface.
8. The tire according to claim 1 , wherein each of the first sipes and the second sipes comprises a raised bottom portion at an opening end portion of the sipe opening to the first chamfered surface or the second chamfered surface, the raised bottom portion having a depth greater than a maximum depth of the first sipes and the second sipes.
9. The tire according to claim 1 , wherein
the tread pattern further comprises, in the region of each of the first land portion and the second land portion, a wall surface of the first land portion or the second land portion adjacent to the first chamfered surface or the second chamfered surface, the wall surface of the first land portion or the second land portion extending continuously from a wall surface of the first sipes or the second sipes, from an opening end portion of the first sipes or the second sipes opening to the first chamfered surface or the second chamfered surface to a wall surface of the circumferential main groove to which the first chamfered surface or the second chamfered surface is inclined, and
the wall surface extends without being inclined with respect to a tire radial direction.
10. The tire according to claim 1 , wherein
the tread pattern further comprises, in the region of each of the first land portion and the second land portion, a wall surface of the first land portion or the second land portion adjacent to the first chamfered surface or the second chamfered surface, the wall surface of the first land portion or the second land portion extending continuously from a wall surface of the first sipes or the second sipes, from an opening end portion of the first sipes or the second sipes opening to the first chamfered surface or the second chamfered surface to a wall surface of the circumferential main groove to which the first chamfered surface or the second chamfered surface is inclined, and
the wall surface extends along an extension direction of the first sipes or the second sipes opening to the first chamfered surface or the second chamfered surface.
11. The tire according to claim 1 , wherein the first sipes and the second sipes are inclined to a same side in the tire circumferential direction with respect to the tire width direction.
12. The tire according to claim 1 , wherein
the tread pattern comprises a circumferential narrow groove extending in the tire circumferential direction in the region of the first land portion and having a groove width smaller than a groove width of the first circumferential main groove and the second circumferential main groove, and
the first sipes are disposed in a region between the first circumferential main groove and the circumferential narrow groove and are is connected to the circumferential narrow groove.
13. The tire according to claim 12 , wherein
the tread pattern comprises a third chamfered surface having a tread surface inclined toward the circumferential narrow groove in an end portion in the tire width direction on a circumferential narrow groove side of a region comprising the first sipes, the region being one of two regions of the first land portion that are divided in the tire width direction by the circumferential narrow groove, and
the third chamfered surface is provided in plurality adjacent in the tire circumferential direction to connection end portions of the first sipes with the circumferential narrow groove.
14. The tire according to claim 13 , wherein a length of the third chamfered surface in the tire circumferential direction is smaller than the lengths of the first chamfered surface and the second chamfered surface in the tire circumferential direction.
15. The tire according to claim 13 , wherein a maximum depth of the third chamfered surface is smaller than a depth of the first sipes.
16. The tire according to claim 1 , wherein the tread pattern does not comprise lug grooves extending in the tire width direction within the region of the first land portion and the second land portion.