Motorcycle tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKota Matsuura
Life of this patent
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Abstract
A motorcycle tire comprises a carcass and a tread reinforcing layer. The tread reinforcing layer comprises a belt and a band. The band is composed of a jointless band ply having a developed width less than 65% of the developed tread width. The belt is composed of at least one belt ply having a developed width of 65% or more of the developed tread width. At first positions, the intersecting angle between the belt cords and the carcass cords is 20 to 60 degrees. In the tread portion in a tire meridional cross sectional view, a single arc passing through a point on the tread surface at the tire equator and two points on the tread surface at the tread edges has a radius of not more than 0.7 times the maximum tire cross-section width.
Claims8
A motorcycle tire comprising:
- a tread portion having a tread surface between a pair of tread edges,
- a toroidal carcass comprising at least one carcass ply of carcass cords,
- a tread reinforcing layer disposed radially outside the carcass in the tread portion,
- the tread reinforcing layer comprising a band and a belt, the band comprising a jointless band ply of one or more band cords wound spirally and circumferentially of the tire at an angle of not more than 5 degrees with respect to the tire circumferential direction, the jointless band ply being centered on the tire equator, and having a developed width of less than 65% of a developed width of the tread portion,
- the belt comprising a plurality of belt plies of parallel belt cords, the plurality of belt plies being centered on the tire equator, and having a developed width of not less than 65% of the developed tread width, wherein the the plurality of belt plies include a radially inner belt ply located radially inside the band, and a radially outer belt ply located radially outside the radially inner belt ply,
- wherein
- the band is positioned radially outside the radially outer belt ply;
- at a first position axially inwardly spaced apart from each tread edge by a developed distance of 10% to 15% of the developed tread width:
- the carcass cords are inclined with respect to the belt cords of the radially inner belt ply to a first direction at a first angle α2 in a range from 20 to 60 degrees;
- the belt cords of the radially outer belt ply are inclined with respect to the belt cords of the radially inner belt ply to the first direction at a second angle α2 in a range from 20 to 60 degrees;
- the second angle α2 is smaller than the first angle α2;
- the carcass cords are inclined at an angle θ1 in a range from 60 to 80 degrees with respect to the tire circumferential direction;
- the belt cords of the radially outer belt ply are inclined at an angle θ3b of not less than 85 degrees with respect to the tire circumferential direction;
- and
- in a meridional cross section of the tire, including the tire rotation axis, under its a normal state, a single-radius circular arc passing through a point on the tread surface at the tire equator and two points on the tread surface at the tread edges has a radius of not more than 0.7 times a section width of the tire.
Dependencies are inferred from the claim text.