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US 2022/0266633 A1Published application
Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorSakiko MATSUMOTO
Life of this patent
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Abstract
In a pneumatic tire, a belt cover layer is provided on an outer circumferential side of a belt layer in a tread portion and includes organic fiber cords helically wound along a tire circumferential direction. As the organic fiber cord, a polyethylene terephthalate fiber cord is used which has a single yarn size fineness of 700 dtex or less and in which the number of twists is 30 twists or more/100 mm. A layer thickness of the belt cover layer is 1.6 times or more as large as a cord diameter of the organic fiber cord.
Claims6
A pneumatic tire comprising:
- a tread portion extending in a tire circumferential direction and having an annular shape;
- a pair of sidewall portions respectively disposed on both sides of the tread portion;
- a pair of bead portions each disposed on an inner side of the sidewall portions in a tire radial direction;
- a carcass layer mounted between the pair of bead portions;
- a plurality of belt layers disposed on an outer circumferential side of the carcass layer in the tread portion;
- and
- a belt cover layer disposed on an outer circumferential side of the belt layers,
- the belt cover layer being formed by helically winding coating rubber-covered organic fiber cords along the tire circumferential direction,
- the organic fiber cord being a polyethylene terephthalate fiber cord having a single yarn size fineness of 700 dtex or less and in which a number of twists is 30 twists or more/100 mm, and
- a layer thickness G of the belt cover layer being 1.6 times or more as large as a cord diameter D of the organic fiber cord.
7 more elements
Dependencies are inferred from the claim text.