Pneumatic tire
View Patent ↗Provided is a pneumatic tire comprising a tread section, a side wall section, and a bead section. A tire constituent member is provided in at least the tread section, extending along the tire circumferential direction and spliced at any positions in the tire circumferential direction. A belt-shaped sound-absorbing member is adhered to a region corresponding to the tread section in the tire inner surface, along the tire circumferential direction and via an adhesive layer. The sound-absorbing member is arranged intermittently along the tire circumferential direction. Sections where the sound-absorbing member is missing are arranged at positions corresponding to the splice portions of the tire constituent member and the sound-absorbing member is arranged so as to not overlap the splice portions.
1. A pneumatic tire comprising:
a tread section forming an annular shape extending in a tire circumferential direction;
a pair of side wall sections arranged on both sides of the tread section; and
a pair of bead sections arranged inside in a tire radial direction of the side wall sections, wherein
a tire constituent member is provided in at least the tread section, extending in the tire circumferential direction and spliced at any position in the tire circumferential direction, a belt-shaped sound-absorbing member is adhered to a region corresponding to the tread section in a tire inner surface, along the tire circumferential direction and via an adhesive layer, the sound-absorbing member is formed of a porous material having open cells, the sound-absorbing member is arranged intermittently along the tire circumferential direction so as to be exposed to the tire inner surface, sections where the sound-absorbing member is missing are arranged at positions corresponding to a splice portion of the tire constituent member, and the sound-absorbing member is arranged so as to not overlap the splice portion.
2. The pneumatic tire according to claim 1 , wherein
the tire constituent member is an inner liner layer and the sections where the sound-absorbing member is missing are arranged at the positions corresponding to the splice portion of the inner liner layer.
3. The pneumatic tire according to claim 1 , wherein
the tire constituent member is a carcass layer and the sections where the sound-absorbing member is missing are arranged at the positions corresponding to the splice portion of the carcass layer.
4. The pneumatic tire according to claim 1 , wherein
the tire constituent member is a carcass layer and an inner liner layer, and the sections where the sound-absorbing member is missing are each arranged at the positions corresponding to the splice portion of the carcass layer and the inner liner layer.
5. The pneumatic tire according to claim 4 , wherein,
when a splice-peripheral region is defined to be 20 mm or less from the splice portion in the tire circumferential direction and splice-adjacent regions are defined to be from 20 to 120 mm from the splice portion in the tire circumferential direction, end sections of the sound-absorbing member in the tire circumferential direction are excluded from the splice-peripheral region to be arranged inside the splice-adjacent regions.
6. The pneumatic tire according to claim 5 , wherein
the sound-absorbing member is a single sound-absorbing member extending in the tire circumferential direction and has a uniform thickness in at least a range corresponding to the surface to which belt-shaped sound-absorbing member is adhered in a cross-section orthogonal to a longitudinal direction of the sound-absorbing member, and a cross-sectional shape is constant in the longitudinal direction.
7. The pneumatic tire according to claim 6 , wherein
a ratio of a volume of the sound-absorbing member with respect to a volume of a cavity formed inside the tire during rim assembly is greater than 20%.
8. The pneumatic tire according to claim 7 , wherein
a hardness of the sound-absorbing member is from 60 to 170 N and a tensile strength of the sound-absorbing member is from 60 to 180 kPa.
9. The pneumatic tire according to claim 8 , wherein
the adhesive layer is formed of double-sided adhesive tape and a peeling adhesive strength of the adhesive layer is in a range of 8 to 40 N/20 mm.
10. The pneumatic tire according to claim 9 , wherein the porous material is a foamed polyurethane.
11. The pneumatic tire according to claim 1 , wherein,
when a splice-peripheral region is defined to be 20 mm or less from the splice portion in the tire circumferential direction and splice-adjacent regions are defined to be from 20 to 120 mm from the splice portion in the tire circumferential direction, end sections of the sound-absorbing member in the tire circumferential direction are excluded from the splice-peripheral region to be arranged inside the splice-adjacent regions.
12. The pneumatic tire according to claim 1 , wherein
the sound-absorbing member is a single sound-absorbing member extending in the tire circumferential direction and has a uniform thickness in at least a range corresponding to the surface to which belt-shaped sound-absorbing member is adhered in a cross-section orthogonal to a longitudinal direction of the sound-absorbing member, and a cross-sectional shape is constant in the longitudinal direction.
13. The pneumatic tire according to claim 1 , wherein
a hardness of the sound-absorbing member is from 60 to 170 N and a tensile strength of the sound-absorbing member is from 60 to 180 kPa.
14. The pneumatic tire according to claim 1 , wherein
the adhesive layer is formed of double-sided adhesive tape and a peeling adhesive strength of the adhesive layer is in a range of 8 to 40 N/20 mm.
15. The pneumatic tire according to claim 1 , wherein the porous material is a foamed polyurethane.
16. The pneumatic tire according to claim 1 , wherein:
the sound absorbing member extends across a majority of the tread section and extends beneath all of circumferential main grooves in the tread section.
17. The pneumatic tire according to claim 1 , wherein:
the tire constituent member includes a carcass layer and an inner liner layer; and
the splice portions of the inner liner layer and the carcass layer are offset from one another.
18. The pneumatic tire according to claim 1 , wherein:
the tire constituent member includes a carcass layer and an inner liner layer; and
ends of the sound-absorbing member on either side of the splice portion of the inner liner layer and the carcass layer are spaced differently from one another.
19. The pneumatic tire according to claim 1 , wherein
a ratio of a volume of the sound-absorbing member with respect to a volume of a cavity formed inside the tire during rim assembly is greater than 20%.
20. The pneumatic tire according to claim 1 , wherein
a ratio of a volume of the sound-absorbing member with respect to a volume of a cavity formed inside the tire during rim assembly is greater than 22%.