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US 10,518,588 B2Granted
Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorTakanori Itou
Life of this patent
Estimating the term…
Abstract
This pneumatic tire comprises a tread portion, sidewall portions, and bead portions, wherein the tread portion includes five main grooves extending in the tire circumferential direction that partition six rows of ribs, a plurality of first sipes is formed in each edge portion of center ribs, intermediate ribs, and shoulder ribs, a plurality of first narrow grooves is formed in each of the center ribs and the intermediate ribs so as to form a connection between the main grooves, a plurality of second narrow grooves is formed in each of the center ribs and the intermediate ribs so as to connect the first narrow grooves, an interval Pg1 of the first narrow groove is from 20 mm to 60 mm, and an interval Ps1 of the first sipe is from 15% to 45% of the interval Pg1 of the first narrow groove.
Claims15
A pneumatic tire comprising:
- a tread portion extending in a tire circumferential direction and constituting an annular shape;
- a pair of sidewall portions disposed on both sides of the tread portion;
- and
- a pair of bead portions disposed inward in a tire radial direction of the sidewall portions;
- the tread portion comprising five main grooves extending in the tire circumferential direction and six rows of ribs extending in the tire circumferential direction and partitioned by the main grooves;
- the ribs being constituted by a pair of center ribs positioned on a tire equatorial plane side, a pair of intermediate ribs positioned outward of each of the center ribs, and a pair of shoulder ribs positioned outward of each of the intermediate ribs;
- one of the five main grooves being positioned between the center ribs and formed to be straight, and only four of the five main grooves having a plurality of protrusions formed periodically on both wall surfaces so as to cause a groove bottom portion to meander;
- a plurality of first sipes being formed in each edge portion, adjacent to the main grooves, of the center ribs, the intermediate ribs, and the shoulder ribs;
- a plurality of first narrow grooves extending in a tire width direction being formed in each of the center ribs and the intermediate ribs so as to form a connection between the main grooves;
- a plurality of second narrow grooves extending in the tire circumferential direction being formed in each of the center ribs and the intermediate ribs so as to connect neighboring first narrow grooves;
- an interval Pg1 in the tire circumferential direction of the first narrow grooves being from 20 mm to 60 mm;
- an interval Ps1 in the tire circumferential direction of the first sipes being from 15% to 45% of the interval Pg1 of the first narrow grooves;
- a ratio Wa/TDW of a width Wa of the center ribs to a development width TDW of the tread portion being from 0.08 to 0.18;
- a ratio Wb/TDW of a width Wb of the intermediate ribs to the development width TDW of the tread portion being from 0.08 to 0.18;
- and
- a ratio Wc/Wa of a width We of the shoulder ribs to the width Wa of the center ribs being from 1.20 to 1.30.
13 more elements
A pneumatic tire comprising:
- a tread portion extending in a tire circumferential direction and constituting an annular shape;
- a pair of sidewall portions disposed on both sides of the tread portion;
- and
- a pair of bead portions disposed inward in a tire radial direction of the sidewall portions;
- the tread portion comprising five main grooves extending in the tire circumferential direction and six rows of ribs extending in the tire circumferential direction and partitioned by the main grooves;
- the ribs being constituted by a pair of center ribs positioned on a tire equatorial plane side, a pair of intermediate ribs positioned outward of each of the center ribs, and a pair of shoulder ribs positioned outward of each of the intermediate ribs;
- one of the five main grooves being positioned between the center ribs and formed to have a straight groove bottom portion, and four of the five main grooves having a plurality of protrusions formed periodically on both wall surfaces so as to form a meandering groove bottom portion;
- a plurality of first sipes being formed in each edge portion, adjacent to the main grooves, of the center ribs, the intermediate ribs, and the shoulder ribs;
- a plurality of first narrow grooves extending in a tire width direction being formed in each of the center ribs and the intermediate ribs so as to form a connection between the main grooves;
- a plurality of second narrow grooves extending in the tire circumferential direction being formed in each of the center ribs and the intermediate ribs so as to connect neighboring first narrow grooves;
- an interval Pg1 in the tire circumferential direction of the first narrow grooves being from 20 mm to 60 mm;
- an interval Ps1 in the tire circumferential direction of the first sipes being from 15% to 45% of the interval Pg1 of the first narrow grooves;
- a ratio Wa/TDW of a width Wa of the center ribs to a development width TDW of the tread portion being from 0.08 to 0.18;
- a ratio Wb/TDW of a width Wb of the intermediate ribs to the development width TDW of the tread portion being from 0.08 to 0.18;
- and
- a ratio Wc/Wa of a width We of the shoulder ribs to the width Wa of the center ribs being from 1.20 to 1.30.
13 more elements
Dependencies are inferred from the claim text.