| CPC B60C 9/2204 (2013.01) [B60C 15/0603 (2013.01); B60C 2009/2223 (2013.01)] | 16 Claims |
|
1. A pneumatic tire comprising:
a tread portion comprising circumferential land portions divided by circumferential grooves extending in a tire circumferential direction;
a pair of sidewall portions;
a pair of bead portions having bead cores therein;
a carcass extending between the bead cores of the pair of bead portions through the tread portion and the pair of sidewall portions;
a belt layer disposed outwardly in a tire radial direction of the carcass in the tread portion; and
a band layer disposed outwardly in the tire radial direction of the belt layer;
wherein the band layer comprises
a first layer covering an entire width of the belt layer, and
second layers disposed outwardly in the tire radial direction of the first layer and arranged separately in a tire axial direction from one another,
wherein each second layer is located inwardly in the tire radial direction of a respective one of the circumferential land portions,
wherein in each circumferential land portion, the second layer has at least one axial edge that is away at a distance (A) of equal to or more than 3.0 mm in the tire axial direction from a groove bottom of one of the circumferential grooves located nearest to the at least one axial edge,
wherein the band layer is disposed without any portion of the second layers between opposing outer edges of each respective second layer being disposed under any of the circumferential grooves,
wherein the belt layer comprises a first belt ply, and a second belt ply disposed outwardly from the first belt ply in the tire radial direction,
wherein the first belt ply and the second belt ply are staggered so that the first belt ply extends further outward in the tire axial direction than the second belt ply to form a first step portion of at least one outer end of the belt layer in the tire axial direction,
wherein at least one outer end of the first layer in the tire axial direction includes a second step portion that covers the first step portion, and
wherein the second layers comprise at least one outermost second layer that is arranged outermost in the tire axial direction, and an outer edge of the at least one outermost second layer is located inward in the tire axial direction from the first step portion and the second step portion that are on a same side of the tread portion as the at least one outermost second layer,
the band layer includes a tape-shaped band strip including one or more band cords therein that is spirally winded in the tire circumferential direction,
at least two adjacent second layers in the tire axial direction that are among the second layers are formed by a continuous single strip of the band strip so as to include a passing-under-groove portion of the band strip that extends in a transverse direction of one of the circumferential grooves between the adjacent second layers, and
the passing-under-groove portion of the band strip has a circumferential length equal to or less than 40% of an entire circumferential length of the respective adjacent second layers.
|
|
13. A pneumatic tire comprising:
a tread portion comprising circumferential land portions divided by circumferential grooves extending in a tire circumferential direction, the circumferential land portions comprising two axially spaced outer circumferential land portions each including a respective tread edge;
a pair of sidewall portions;
a pair of bead portions having bead cores therein;
a carcass extending between the bead cores of the pair of bead portions through the tread portion and the pair of sidewall portions;
a belt layer disposed outwardly in a tire radial direction of the carcass in the tread portion; and
a band layer disposed outwardly in the tire radial direction of the belt layer;
wherein the band layer comprises
a first layer covering an entire width of the belt layer, and
second layers disposed outwardly in the tire radial direction of the first layer and arranged separately in a tire axial direction from one another,
wherein each second layer is located inwardly in the tire radial direction of a respective one of the circumferential land portions,
wherein in each circumferential land portion, the second layer has at least one axial edge that is away at a distance (A) of equal to or more than 3.0 mm in the tire axial direction from a groove bottom of one of the circumferential grooves located nearest to the at least one axial edge,
wherein the second layers comprise two axially spaced outermost second layers each located inwardly in the tire radial direction of a respective one of the outer circumferential land portions,
wherein the outermost second layers have respective outer edges in the tire axial direction,
wherein the respective outer edges of the outermost second layers are located inwardly in the tire axial direction at a distance (B1) from respective outer edges of the belt layer,
wherein the distance (B1) is equal to or more than 12 mm,
wherein the belt layer comprises a first belt ply, and a second belt ply disposed outwardly from the first belt ply in the tire radial direction,
wherein the first belt ply and the second belt ply are staggered so that the first belt ply extends further outward in the tire axial direction than the second belt ply to form a first step portion of at least one outer end of the belt layer in the tire axial direction,
wherein at least one outer end of the first layer in the tire axial direction includes a second step portion that covers the first step portion,
wherein the outer edge of at least one of the outermost second layers is located inward in the tire axial direction from the first step portion and the second step portion that are on a same side of the tread portion as the at least one of the outermost second layers,
the band layer includes a tape-shaped band strip including one or more band cords therein that is spirally winded in the tire circumferential direction,
at least two adjacent second layers in the tire axial direction that are among the second layers are formed by a continuous single strip of the band strip so as to include a passing-under-groove portion of the band strip that extends in a transverse direction of one of the circumferential grooves between the adjacent second layers, and
the passing-under-groove portion of the band strip has a circumferential length equal to or less than 40% of an entire circumferential length of the respective adjacent second layers.
|
|
15. A pneumatic tire comprising:
a tread portion comprising circumferential land portions divided by circumferential grooves extending in a tire circumferential direction, the circumferential land portions comprising two axially spaced outer circumferential land portions each including a respective tread edge;
a pair of sidewall portions;
a pair of bead portions having bead cores therein;
a carcass extending between the bead cores of the pair of bead portions through the tread portion and the pair of sidewall portions;
a belt layer disposed outwardly in a tire radial direction of the carcass in the tread portion; and
a band layer disposed outwardly in the tire radial direction of the belt layer;
wherein the band layer comprises
a first layer covering an entire width of the belt layer, and
second layers disposed outwardly in the tire radial direction of the first layer and arranged separately in a tire axial direction from one another,
wherein each second layer is located inwardly in the tire radial direction of a respective one of the circumferential land portions,
wherein in each circumferential land portion, the second layer has at least one axial edge that is away at a distance (A) of equal to or more than 3.0 mm in the tire axial direction from a groove bottom of one of the circumferential grooves located nearest to the at least one axial edge,
wherein the second layers comprise two axially spaced outermost second layers each located inwardly in the tire radial direction of a respective one of the outer circumferential land portions,
wherein the outermost second layers have respective outer edges in the tire axial direction,
wherein the belt layer comprises a first belt ply, and a second belt ply disposed outwardly in the tire radial direction of the first belt ply and having a smaller width than that of the first belt ply,
wherein the respective outer edges of the outermost second layers are located inwardly in the tire axial direction at a distance (B2) from respective outer edges of the second belt ply,
wherein the distance (B2) is equal to or more than 5 mm,
wherein the first belt ply and the second belt ply are staggered so that the first belt ply extends further outward in the tire axial direction than the second belt ply to form a first step portion of at least one outer end of the belt layer in the tire axial direction,
wherein at least one outer end of the first layer in the tire axial direction includes a second step portion that covers the first step portion, and
wherein the outer edge of at least one of the outermost second layers is located inward in the tire axial direction from the first step portion and the second step portion that are on a same side of the tread portion as the at least one of the outermost second layers,
the band layer includes a tape-shaped band strip including one or more band cords therein that is spirally winded in the tire circumferential direction,
at least two adjacent second layers in the tire axial direction that are among the second layers are formed by a continuous single strip of the band strip so as to include a passing-under-groove portion of the band strip that extends in a transverse direction of one of the circumferential grooves between the adjacent second layers, and
the passing-under-groove portion of the band strip has a circumferential length equal to or less than 40% of an entire circumferential length of the respective adjacent second layers.
|