Pneumatic tire
Provided is a pneumatic tire with an annular-shaped tread portion extending in a tire circumferential direction, a pair of sidewall portions disposed on both sides of the tread portion, and a pair of bead portions disposed inward of these sidewall portions in a tire radial direction. This pneumatic tire is also provided with a reinforcing member which includes a plurality of reinforcing cords oriented in at least three directions, and has a mesh-like structure with at least three of the reinforcing cords oriented in different directions joined together at at least a portion of intersecting locations of the reinforcing cords.
1. A pneumatic tire, comprising:
an annular-shaped tread portion extending in a tire circumferential direction;
a pair of sidewall portions disposed on both sides of the tread portion;
a pair of bead portions disposed inward of these sidewall portions in a tire radial direction; and
a reinforcing member that includes a plurality of reinforcing cords oriented in at least three directions, and has a mesh-like structure with at least three of the reinforcing cords oriented in different directions joined together at at least a portion of intersecting locations of the reinforcing cords;
wherein at least one cord of the plurality of reinforcing cords extending in one of the at least three directions extends inclined at an angle with respect to the tire width direction and with respect to the tire circumferential direction continuously across at least three cords of the plurality of reinforcing cords extending in another one of the at least three directions non-parallel to the tire width direction.
2. The pneumatic tire according to claim 1 , wherein:
the pneumatic tire further comprises a carcass layer disposed extending between the pair of bead portions, and a belt layer disposed on an outer circumferential side of the carcass layer in the tread portion; and
the reinforcing member having a mesh-like structure is used as the belt layer.
3. The pneumatic tire according to claim 1 , wherein at least three reinforcing cords are joined together at at least 30% of the intersecting locations where the at least three reinforcing cords intersect.
4. The pneumatic tire according to claim 1 , wherein an intersection angle of the at least three reinforcing cords joined at intersecting locations is 15° or greater.
5. The pneumatic tire according to claim 1 , wherein a belt layer is formed by winding the reinforcing member having a mesh-like structure in the tire circumferential direction.
6. The pneumatic tire according to claim 1 , wherein a belt layer is formed by machining the reinforcing member having a mesh-like structure into an annular shape without ends.
7. The pneumatic tire according to claim 1 , wherein the reinforcing cord includes a synthetic fiber cord having a knot strength of 1.5 (cN/dtex) or greater.
8. The pneumatic tire according to claim 1 , wherein the reinforcing member having a mesh-like structure is coated with rubber.
9. The pneumatic tire according to claim 1 , wherein:
the pneumatic tire further comprises a carcass layer disposed extending between the pair of bead portions; and
the reinforcing member having a mesh-like structure in a region on a bead portion side is used as the carcass layer.
10. The pneumatic tire according to claim 9 , wherein at least three reinforcing cords are joined together at at least 30% of the intersecting locations where the at least three reinforcing cords intersect.
11. The pneumatic tire according to claim 9 , wherein an intersection angle of at least three reinforcing cords joined at the intersecting locations is 15° or greater.
12. The pneumatic tire according to claim 9 , wherein the carcass layer is formed by machining the reinforcing member having a mesh-like structure into an annular shape without ends.
13. The pneumatic tire according to claim 9 , wherein the reinforcing cord includes a synthetic fiber cord having a knot strength of 1.5 (cN/dtex) or greater.
14. The pneumatic tire according to claim 9 , wherein the reinforcing member having a mesh-like structure is coated with rubber.
15. The pneumatic tire according to claim 1 , wherein:
the pneumatic tire further comprises a carcass layer disposed extending between the pair of bead portions, and a bead reinforcing layer embedded in the bead portions; and
the reinforcing member having a mesh-like structure is used as the bead reinforcing layer.
16. The pneumatic tire according to claim 15 , wherein at least three reinforcing cords are joined together at at least 30% of the intersecting locations where the at least three reinforcing cords intersect.
17. The pneumatic tire according to claim 15 , wherein an intersection angle of the at least three reinforcing cords joined at intersecting locations is 15° or greater.
18. The pneumatic tire according to claim 15 , wherein a density of joined portions of the reinforcing cords of the reinforcing member increases inward in the tire radial direction.
19. The pneumatic tire according to claim 15 , wherein the bead reinforcing layer is formed by machining the reinforcing member having a mesh-like structure into an annular shape without ends.
20. The pneumatic tire according to claim 15 , wherein the reinforcing cord includes a synthetic fiber cord having a knot strength of 1.5 (cN/dtex) or greater.
21. The pneumatic tire according to claim 15 , wherein the reinforcing member having a mesh-like structure is coated with rubber.