Motorcycle tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorYoshihisa Noguchi
Life of this patent
Estimating the term…
Abstract
A motorcycle tire can include a tread portion, sidewall portions, bead portions, and a carcass. The tread portion can include a tread reinforcing layer and a tread rubber. The tread reinforcing layer can include a belt layer and a band layer. A development width of the band layer can be smaller than that of the belt layer. The tread rubber can include a crown rubber and shoulder rubbers. A hardness at 100° C. of each shoulder rubber can be higher than a hardness at 100° C. of the crown rubber, a complex elastic modulus at 100° C. of each shoulder rubber can be higher than a complex elastic modulus at 100° C. of the crown rubber, and a 300% modulus at 100° C. of each shoulder rubber can be higher than a 300% modulus at 100° C. of the crown rubber.
Claims18
A motorcycle tire comprising:
- a tread portion;
- a pair of sidewall portions;
- a pair of bead portions;
- and
- a carcass extending on and between the pair of bead portions, wherein
- the tread portion includes a tread reinforcing layer placed outward of the carcass in a tire radial direction, and a tread rubber placed outward of the tread reinforcing layer in the tire radial direction,
- the tread reinforcing layer includes a belt layer including a plurality of belt cords inclined with respect to a tire circumferential direction, and a band layer placed outward of the belt layer in the tire radial direction and including at least one band cord helically wound in the tire circumferential direction,
- a development width of the band layer is smaller than a development width of the belt layer,
- the tread rubber includes a crown rubber placed in a region including a tire equator, and shoulder rubbers each placed outward of the crown rubber in a tire axial direction in a region including a tread edge,
- a hardness at 100° C. of each shoulder rubber is higher than a hardness at 100° C. of the crown rubber,
- a complex elastic modulus at 100° C. of each shoulder rubber is higher than a complex elastic modulus at 100° C. of the crown rubber,
- a 300% modulus at 100° C. of each shoulder rubber is higher than a 300% modulus at 100° C. of the crown rubber,
- a breaking strength of the at least one band cord is higher than a breaking strength of each of the plurality of belt cords,
- the belt layer is comprised of a first ply and a second ply,
- the band layer straddles the tire equator and has a width extending in the tire axial direction in a plan view of the tread portion to provide increased stiffness in the tire circumferential direction, and
- the belt layer extends in the circumferential direction in the plan view of the tread portion to provide increased stiffness in the tire axial direction.
A motorcycle tire comprising:
- a tread portion;
- a pair of sidewall portions;
- a pair of bead portions;
- and
- a carcass extending on and between the pair of bead portions, wherein
- the tread portion includes a tread reinforcing layer placed outward of the carcass in a tire radial direction, and a tread rubber placed outward of the tread reinforcing layer in the tire radial direction,
- the tread reinforcing layer includes a belt layer including a plurality of belt cords inclined with respect to a tire circumferential direction, and a band layer placed outward of the belt layer in the tire radial direction and including at least one band cord helically wound in the tire circumferential direction,
- a development width of the band layer is smaller than a development width of the belt layer,
- the tread rubber includes a crown rubber placed in a region including a tire equator, and shoulder rubbers each placed outward of the crown rubber in a tire axial direction in a region including a tread edge,
- a hardness at 100° C. of each shoulder rubber is higher than a hardness at 100° C. of the crown rubber,
- a complex elastic modulus at 100° C. of each shoulder rubber is higher than a complex elastic modulus at 100° C. of the crown rubber,
- a 300% modulus at 100° C. of each shoulder rubber is higher than a 300% modulus at 100° C. of the crown rubber, and
- the development width the band layer is 20% to 60% of the development width of the belt layer.
A motorcycle tire comprising:
- a tread portion;
- a pair of sidewall portions;
- a pair of bead portions;
- and
- a carcass extending on and between the pair of bead portions, wherein
- the tread portion includes a tread reinforcing layer placed outward of the carcass in a tire radial direction, and a tread rubber placed outward of the tread reinforcing layer in the tire radial direction,
- the tread reinforcing layer includes a belt layer including a plurality of belt cords inclined with respect to a tire circumferential direction, and a band layer placed outward of the belt layer in the tire radial direction and including at least one band cord helically wound in the tire circumferential direction,
- a development width of the band layer is smaller than a development width of the belt layer,
- the tread rubber includes a crown rubber placed in a region including a tire equator, and shoulder rubbers each placed outward of the crown rubber in a tire axial direction in a region including a tread edge,
- a hardness at 100° C. of each shoulder rubber is higher than a hardness at 100° C. of the crown rubber,
- a complex elastic modulus at 100° C. of each shoulder rubber is higher than a complex elastic modulus at 100° C. of the crown rubber,
- a 300% modulus at 100° C. of each shoulder rubber is higher than a 300% modulus at 100° C. of the crown rubber,
- the belt layer includes a first ply and a second ply,
- a development width of the first belt ply and a development width of the second belt ply is 80% to 100% a development width of the tread portion,
- the first ply includes a first plurality of belt cords inclined in a first direction with respect to the tire circumferential direction, and
- the second ply includes a second plurality of belt cords inclined in a second direction opposite to the first direction with respect to the tire circumferential direction.
Dependencies are inferred from the claim text.