Motorcycle tire and motorcycle tire set
AssigneeSumitomo Rubber Industries, Ltd.
InventorKazuki Fukushima
Life of this patent
Estimating the term…
Abstract
A motorcycle tire comprises a tread rubber including a crown rubber disposed in a crown region and a pair of shoulder rubbers extending to tread edges. A complex elastic modulus of the crown rubber is smaller than complex elastic moduli of the shoulder rubbers. Ground contacting areas A0, A10 and A40 of the tire which occur when the tire under a regular state is placed on a flat horizontal plane at camber angles of 0, 10 and 40 degrees and loaded with a regular tire load, satisfy the following conditional expressions: 0.3 = < ( Ec * × A 0 ) / ( Es * × A 40 ) = < 1.05 , and 0.95 = < A 10 / A 0 = < 1.05 .
Claims19
A motorcycle tire set consisting of a front wheel tire and a rear wheel tire, each of the front wheel tire and the rear wheel tire comprising:
- a tread portion having a pair of tread edges;
- and
- a tread rubber forming a ground contacting surface of the tread portion, wherein
- the tread rubber includes
- a crown rubber disposed in a crown region including the tire equator, and
- a pair of shoulder rubbers disposed one on each side of the crown rubber in the tire axial direction, and extending to the tread edges, respectively,
- a complex elastic modulus Ec* of the crown rubber is smaller than a complex elastic modulus Es* of each of the shoulder rubbers, and
- when the motorcycle tire under a regular state in which the tire is mounted on a regular rim and inflated to a regular internal pressure, is placed on a flat horizontal surface, by applying a regular tire load, ground contact areas A0, A10 and A40 of the tire at tire camber angles of 0 degrees, 10 degrees and 40 degrees, respectively, satisfies the following conditional expressions:
- 0.3
- <=
- (
- Ec
- *
- ×
- A
-
- 0
- )
- /
- (
- Es
- *
- ×
- A
-
- 40
- )
- <=
- 1.05
- ;
- and
- 0.95
- <=
- A
-
- 10
- /
- A
-
- 0
- <=
- 1.05
- ,
- wherein
- in each of the front wheel tire and the rear wheel tire, the complex elastic modulus Ec* of the crown rubber is smaller than the complex elastic modulus Es* of each of the shoulder rubbers, and
- a difference (Es *−Ec*) F between the complex elastic modulus Ec* of the crown rubber and the complex elastic modulus Es* of each shoulder rubber of the front wheel tire is larger than a difference (Es *−Ec*) R between the complex elastic modulus Ec* of the crown rubber and the complex elastic modulus Es* of each shoulder rubber of the rear wheel tire.
Dependencies are inferred from the claim text.