PNEUMATIC TIRE
First Claim
1. A pneumatic tire comprising a narrow groove which extends in a tire circumferential direction, the narrow groove being formed in a shoulder land portion of a tread, the shoulder land portion being sectioned into a main land portion in a tread center side and a sacrificed land portion in a tread end side by the narrow groove,wherein a groove bottom portion of the narrow groove is formed by depressing a groove wall in the tread center side,wherein a contour of a ground surface of the main land portion is formed by a first circular arc in the tread center side and a second circular arc in the tread end side, and a radius of curvature R1 of the first circular arc is greater than a radius of curvature R2 of the second circular arc, andwherein a ratio W/d satisfies a relationship 2≤
- W/d≤
6 in which d is a depression width of a groove bottom portion on the basis of the groove wall of the narrow groove in the tread center side, W is a distance from a tread end side edge of the main land portion to a boundary between the first circular arc and the second circular arc, and the ratio W/d is a ratio of the distance W in relation to the depression width d.
1 Assignment
0 Petitions
Accused Products
Abstract
A shoulder land portion is sectioned into a main land portion and a sacrificed land portion by a narrow groove extending in a tire circumferential direction. A groove bottom portion of the narrow groove is formed by depressing a groove wall in the tread center side. A contour of the main land portion is formed by a first circular arc in a tread center side and a second circular arc in a tread end side. A radius of curvature R1 of the first circular arc is greater than a radius of curvature R2 of the second circular arc. A ratio W/d satisfies a relationship 2≤W/d≤6. The d is a depression width of a groove bottom portion. The W is a distance from a tread end side edge of the main land portion to a boundary between the first circular arc and the second circular arc.
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Citations
6 Claims
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1. A pneumatic tire comprising a narrow groove which extends in a tire circumferential direction, the narrow groove being formed in a shoulder land portion of a tread, the shoulder land portion being sectioned into a main land portion in a tread center side and a sacrificed land portion in a tread end side by the narrow groove,
wherein a groove bottom portion of the narrow groove is formed by depressing a groove wall in the tread center side, wherein a contour of a ground surface of the main land portion is formed by a first circular arc in the tread center side and a second circular arc in the tread end side, and a radius of curvature R1 of the first circular arc is greater than a radius of curvature R2 of the second circular arc, and wherein a ratio W/d satisfies a relationship 2≤ - W/d≤
6 in which d is a depression width of a groove bottom portion on the basis of the groove wall of the narrow groove in the tread center side, W is a distance from a tread end side edge of the main land portion to a boundary between the first circular arc and the second circular arc, and the ratio W/d is a ratio of the distance W in relation to the depression width d. - View Dependent Claims (2, 3, 4, 5, 6)
- W/d≤
Specification