Pneumatic tire
The pneumatic tire includes a carcass layer, a belt layer disposed on an outer side of the carcass layer in a radial direction, and a tread rubber disposed on an outer side of the belt layer in the radial direction. Additionally, the carcass layer has a cord angle of 80° or more and 100° or less. Additionally, the belt layer is formed by layering a first reinforcing belt, a second reinforcing belt that is narrower than the first reinforcing belt, and an auxiliary belt that is spaced apart from a tire equatorial plane and disposed between the carcass layer and the first reinforcing belt. Additionally, the first reinforcing belt and the second reinforcing belt have cord angles of 11° or more and 30° or less, and the auxiliary belt has a cord angle of 55° or more and 70° or less.
1 . A pneumatic tire, comprising:
a carcass layer;
a belt layer disposed on an outer side of the carcass layer in a radial direction; and
a tread rubber disposed on an outer side of the belt layer in the radial direction,
the carcass layer having a cord angle of 80° or more and 100° or less with respect to a tire circumferential direction,
the belt layer being formed by layering a first reinforcing belt, a second reinforcing belt that is narrower than the first reinforcing belt, and an auxiliary belt that is spaced apart from a tire equatorial plane and disposed between the carcass layer and the first reinforcing belt,
the auxiliary belt being made by performing a rolling process on coating rubber-covered belt cords made of steel,
the first reinforcing belt and the second reinforcing belt having cord angles of 11° or more and 30° or less with respect to the tire circumferential direction, and
the auxiliary belt having a cord angle of 61° or more and 70° or less with respect to the tire circumferential direction, wherein
a distance De 5 from the tire equatorial plane to an outer end portion of the auxiliary belt in a tire width direction has a relationship 0.75≤De 5 /De 1 ≤0.99 with respect to a distance De 1 from the tire equatorial plane to an end portion of the first reinforcing belt,
a distance De 5 ′ from the tire equatorial plane to an inner end portion of the auxiliary belt in the tire width direction has a relationship 0.05≤De 5 ′/De 5 ≤0.30 with respect to the distance De 5 from the tire equatorial plane to the outer end portion of the auxiliary belt,
a cord diameter of a belt cord forming the auxiliary belt is in a range of 2.0 mm or more and 4.5 mm or less, and
a number of ends of the belt cords forming the auxiliary belt is in a range of 13 ends/50 mm or more and 20 ends/50 mm or less,
the belt layer comprises a first protection belt disposed on an outer side of the first reinforcing belt and the second reinforcing belt in the radial direction,
the first protection belt has a cord angle of 11° or more and 30° or less with respect to the tire circumferential direction, and
a distance De 3 from the tire equatorial plane to an end portion of the first protection belt has a relationship De 1 <De 3 with respect to a distance De 1 to an end portion of the first reinforcing belt and a relationship De 2 <De 3 with respect to a distance De 2 to an end portion of the second reinforcing belt, and
a second protection belt is disposed in a layered manner on an outer side of the first protection belt in the tire radial direction and is narrower than the first protection belt.
2 . The pneumatic tire according to claim 1 , wherein a distance De 5 from the tire equatorial plane to an outer end portion of the auxiliary belt in a tire width direction has a relationship 0.60≤De 5 /(TDW/2)≤0.90 with respect to a developed tread half-width TDW/2.
3 . The pneumatic tire according to claim 1 , wherein a distance De 5 ′ from the tire equatorial plane to an inner end portion of the auxiliary belt in a tire width direction has a relationship 0.10≤De 5 ′/(TDW/2)≤0.40 with respect to a developed tread half-width TDW/2.
4 . The pneumatic tire according to claim 1 , wherein a width Wb 5 of the auxiliary belt has a relationship 0.40≤Wb 5 /(TDW/2)≤0.60 with respect to a developed tread half-width TDW/2.
5 . The pneumatic tire according to claim 1 , wherein a distance De 1 from the tire equatorial plane to an end portion of the first reinforcing belt has a relationship 0.70≤De 1 /(TDW/2)≤0.95 with respect to a developed tread half-width TDW/2.
6 . The pneumatic tire according to claim 1 , wherein a distance De 2 from the tire equatorial plane to an end portion of the second reinforcing belt has a relationship 0.70≤De 2 /(TDW/2)≤0.95 with respect to a developed tread half-width TDW/2.
7 . The pneumatic tire according to claim 1 , wherein
the belt layer comprises a protection belt disposed on an outer side of the first reinforcing belt and the second reinforcing belt in the radial direction, and
a distance De 3 from the tire equatorial plane to an end portion of the protection belt has a relationship 0.80≤De 3 /(TDW/2)≤0.99 with respect to a developed tread half-width TDW/2.
8 . The pneumatic tire according to claim 1 , wherein a shoulder drop amount Dt of a tread profile when the tire is mounted on a specified rim and inflated to a specified internal pressure has a relationship 0.025≤Dt/SH≤0.070 with respect to a tire cross-sectional height SH.
9 . The pneumatic tire according to claim 1 , wherein a distance Gca 1 from a tread profile to a carcass profile on the tire equatorial plane has a relationship 0.80≤Gca 1 /Gca 2 ≤1.25 with respect to a distance Gca 2 from a tread edge to a carcass profile.
10 . The pneumatic tire according to claim 1 , wherein a gauge Gtr 1 of the tread rubber on the tire equatorial plane has a relationship 0.90≤Gtr 1 /Gtr 2 ≤1.35 with respect to a gauge Gtr 2 of the tread rubber at an end portion position of an outermost layer of the belt layer.
11 . The pneumatic tire according to claim 1 , wherein the pneumatic tire is an OR tire for a construction or industrial vehicle having an aspect ratio of 70% or less.
12 . The pneumatic tire according to claim 1 , wherein an aspect ratio of the carcass layer is 70% or less.
13 . A pneumatic tire, comprising:
a carcass layer;
a belt layer disposed on an outer side of the carcass layer in a radial direction; and
a tread rubber disposed on an outer side of the belt layer in the radial direction,
the carcass layer having a cord angle of 80° or more and 100° or less with respect to a tire circumferential direction,
the belt layer being formed by layering a first reinforcing belt, a second reinforcing belt that is narrower than the first reinforcing belt, and an auxiliary belt that is spaced apart from a tire equatorial plane and disposed between the carcass layer and the first reinforcing belt,
the first and second reinforcing belts being made by performing a rolling process on coating rubber-covered belt cords made of steel,
the first reinforcing belt and the second reinforcing belt having cord angles of 11° or more and 30° or less with respect to the tire circumferential direction, and
the auxiliary belt having a cord angle of 55° or more and 70° or less with respect to the tire circumferential direction, wherein
the belt layer comprises a protection belt disposed on an outer side of the first reinforcing belt and the second reinforcing belt in the radial direction,
the protection belt has a cord angle of 11° or more and 30° or less with respect to the tire circumferential direction,
the protection belt comprises rubber-covered belt cords made of steel and is made by performing a rolling process,
a distance De 3 from the tire equatorial plane to an end portion of the protection belt has a relationship De 1 <De 3 with respect to a distance De 1 to an end portion of the first reinforcing belt and a relationship De 2 <De 3 with respect to a distance De 2 to an end portion of the second reinforcing belt,
a distance De 5 ′ from the tire equatorial plane to an inner end portion of the auxiliary belt in the tire width direction has a relationship 0.05≤De 5 ′/De 5 ≤0.30 with respect to a distance De 5 from the tire equatorial plane to an outer end portion of the auxiliary belt,
an outer diameter of the belt cord forming the first and second reinforcing belts is in a range of 2.0 mm or more and 4.5 mm or less,
a number of ends of the belt cords forming the first and second reinforcing belts is in a range of 14 ends/50 mm or more and 22 ends/50 mm or less, and
a cord diameter of the belt cord forming the protection belt is narrower than the cord diameter of the belt cords of the first and second reinforcing belt.
14 . The pneumatic tire according to claim 13 , wherein the protection belt is wider than each of the first reinforcing belt and the second reinforcing belt, and the protection belt is disposed to entirely cover the first reinforcing belt and the second reinforcing belt from an outer side in the radial direction.
15 . A pneumatic tire, comprising:
a carcass layer;
a belt layer disposed on an outer side of the carcass layer in a radial direction; and
a tread rubber disposed on an outer side of the belt layer in the radial direction,
the carcass layer having a cord angle of 80° or more and 100° or less with respect to a tire circumferential direction,
the belt layer being formed by layering a first reinforcing belt, a second reinforcing belt that is narrower than the first reinforcing belt, and an auxiliary belt that is spaced apart from a tire equatorial plane and disposed between the carcass layer and the first reinforcing belt,
the auxiliary belt being made by performing a rolling process on coating rubber-covered belt cords made of steel,
the first and second reinforcing belts being made by performing a rolling process on coating rubber-covered belt cords made of steel,
the first reinforcing belt and the second reinforcing belt having cord angles of 11° or more and 30° or less with respect to the tire circumferential direction, and
the auxiliary belt having a cord angle of 55° or more and 70° or less with respect to the tire circumferential direction, wherein
a distance De 5 from the tire equatorial plane to an outer end portion of the auxiliary belt in a tire width direction has a relationship 0.75≤De 5 /De 1 ≤0.99 with respect to a distance De 1 from the tire equatorial plane to an end portion of the first reinforcing belt,
a distance De 5 ′ from the tire equatorial plane to an inner end portion of the auxiliary belt in the tire width direction has a relationship 0.05≤De 5 ′/De 5 ≤0.30 with respect to the distance De 5 from the tire equatorial plane to the outer end portion of the auxiliary belt,
a distance De 2 from the tire equatorial plane to an end portion of the second reinforcing belt is less than the distance De 5 from the tire equatorial plane to the outer end portion of the auxiliary belt in the tire width direction,
an outer diameter of the belt cord forming the first and second reinforcing belts is in a range of 2.0 mm or more and 4.5 mm or less,
a number of ends of the belt cords forming the first and second reinforcing belts is in a range of 14 ends/50 mm or more and 22 ends/50 mm or less,
a cord diameter of a belt cord forming the auxiliary belt is in a range of 2.0 mm or more and 4.5 mm or less, and
a number of ends of the belt cords forming the auxiliary belt is in a range of 13 ends/50 mm or more and 20 ends/50 mm or less.