초록 ▼

The elliptically-shaped tire has a pair of oppositely-opposed bead cores, a carcass structure each end of which is wrapped around a bead core, an apex disposed between the carcass structure and each of the ends thereof, a pair of oppositely-opposed sidewalls overlying the carcass structure, a chafer

The elliptically-shaped tire has a pair of oppositely-opposed bead cores, a carcass structure each end of which is wrapped around a bead core, an apex disposed between the carcass structure and each of the ends thereof, a pair of oppositely-opposed sidewalls overlying the carcass structure, a chafer strip positioned between the carcass structure and each of the sidewalls, and a tread overlying the carcass structure and a belt reinforcing structure positioned therebetween. The carcass structure has a carcass aspect ratio of about 60. Additionally, the tire has a pair of oppositely-opposed sidewall portions having a relatively thin radially outer portion and a relatively thick radially inner portion.

대표청구항 ▼

A pneumatic tire for use on a wheel rim including, in combination, a pair of oppositely-opposed bead cores, a carcass structure each end of which is wrapped around a bead core, an apex disposed between the carcass structure and each of the ends thereof, a pair of oppositely-opposed sidewalls overlyi

A pneumatic tire for use on a wheel rim including, in combination, a pair of oppositely-opposed bead cores, a carcass structure each end of which is wrapped around a bead core, an apex disposed between the carcass structure and each of the ends thereof, a pair of oppositely-opposed sidewalls overlying said carcass structure, a chaffer strip positioned between said carcass structure and each of said sidewalls, a tread overlying said carcass structure and a belt reinforcing structure positioned therebetween; the improvement comprising: said carcass structure having a carcass aspect ratio of from about 50 to about 70, a pair of oppositely-opposed sidewall portions having a relatively thin radially outer portion and a relatively thick radially inner portion with the ratio of the minimum thinness of the radially outer portion to the maximum thickness of the radially inner portion being from about 1:3.5 to about 1:5, said sidewall portions each have an inner surface of an upper surface portion S and a lower surface portion O and an outer surface T, said upper surface portion S following the natural shape equation: [Figure] (I) wherein; [Figure] [Figure] S is equal to the axial distance from the centerplane to the natural shape line of the carcass structure; ro is equal to the radius from the axis of rotation at the centerline of the tire to the natural shape line of the carcass structure; rm is equal to the radius from the axis of rotation to the maximum axial distance on the natural shape line of the carcass structure to the centerplane of the tire; F(qqO=Ko+K1X+K2X2+K3X3+K4X4+K5X5 (II) wherein, O is the axial distance from the mid-circumferential plane of the tire; X is the distance from the rotational axis of the tire; ________________________________ -Ko =6.42 K3 =1.69715 K1 =23.81 K4 =.11605 K2 =10.6733 K5 =.0029 ________________________________ and said outer surface T following equation: Th=Ko′+K1′X+K3′X3+K4′X4+K5′X5 (III) wherein, Th is the gauge thickness from the contour of the inner surface measured parallel to the axis of rotation of the tire to the outer surface contour T; X is the distance from the rotational axis of the tire; and ________________________________ -Ko′=-3.981 K3 ′=-2.73194 K1′=-44.639 K4 ′=0.17864 K2′=18.2917 K5 ′=-.004329 ________________________________