Tire noise reduction device
View Patent ↗A tire noise reduction device includes at least one noise absorbing member made of a porous material. The noise absorbing member is attached to the inner surface of the tire tread portion. The noise absorbing member includes multiple continuous grooves arranged side by side in a tire circumferential direction in the outer peripheral surface of the noise absorbing member. Each of the continuous grooves has an areal groove bottom and forms see-through regions in the width direction of the noise absorbing member. A groove edge-to-edge distance between each adjacent two of the continuous grooves in the tire circumferential direction is 2 mm to 40 mm. A largest see-through cross-sectional area of each continuous groove is 20 mm 2 to 100 mm 2 .
1. A tire noise reduction device attached to a tire comprising:
at least one noise absorbing member which is made of a porous material and attached to an inner surface of a tire tread portion, wherein
the noise absorbing member includes a plurality of continuous grooves arranged side by side in a tire circumferential direction in an outer peripheral surface of the noise absorbing member,
each of the continuous grooves has an areal groove bottom and extends from one side surface to an opposite side surface of the noise absorbing member in a tire width direction so that one side can be seen through the continuous groove from the opposite side,
a groove edge-to-edge distance between each adjacent two of the continuous grooves in the tire circumferential direction is 2 mm to 40 mm, and
a largest see-through cross-sectional area of each of the continuous grooves is 20 mm 2 to 100 mm 2 .
2. The tire noise reduction device according to claim 1 , wherein
water repellent finishing is performed on at least the outer peripheral surface of the noise absorbing member.
3. The tire noise reduction device according to claim 1 , wherein
the noise absorbing member has an apparent density of 5 kg/m 3 to 30 kg/m 3 .
4. The tire noise reduction device according to claim 1 , wherein
each of the continuous grooves has a depth of 1 mm to 10 mm.
5. The tire noise reduction device according to claim 1 , wherein
each of the continuous grooves has a width of 2 mm to 30 mm.
6. The tire noise reduction device according to claim 1 , wherein
a see-through-region extending direction specified by the largest see-through cross-sectional area of the continuous grooves is inclined at 0° to 30° to the tire width direction.
7. The tire noise reduction device according to claim 1 , wherein
other continuous grooves are formed to cross the continuous grooves, and
the continuous grooves and the other continuous grooves define block-form land portions.
8. The tire noise reduction device according to claim 7 , wherein
the other continuous grooves extend substantially in the tire circumferential direction.
9. The tire noise reduction device according to claim 7 , wherein
the number of the block-form land portions is 400/m 2 to 80000/m 2 .
10. The tire noise reduction device according to claim 1 , wherein
the area where the outer peripheral surface of the noise absorbing member is in contact with the inner surface of the tread portion is 20% to 90% of a projected area of the noise absorbing member that is projected in a tire radial direction.
11. The tire noise reduction device according to claim 7 , wherein
the area where the outer peripheral surface of the noise absorbing member is in contact with the inner surface of the tread portion is 20% to 90% of a projected area of the noise absorbing member that is projected in a tire radial direction.
12. The tire noise reduction device according to claim 1 , further comprising
an annular elastic band attached to the noise absorbing member for attaching the noise absorbing member to the inner surface of the tire tread portion.
13. The tire noise reduction device according to claim 7 , further comprising
an annular elastic band attached to the noise absorbing member for attaching the noise absorbing member to the inner surface of the tire tread portion.
14. The tire noise reduction device according to claim 12 , wherein
the noise absorbing member includes multiple divided parts, and
the divided parts are arranged at certain intervals in the tire circumferential direction.
15. The tire noise reduction device according to claim 13 , wherein
the noise absorbing member includes multiple divided parts, and
the divided parts are arranged at certain intervals in the tire circumferential direction.
16. A pneumatic tire comprising:
the tire noise reduction device according to claim 1 , the tire noise reduction device mounted on an inner surface of a tread portion of the tire.
17. A pneumatic tire comprising:
the tire noise reduction device according to claim 12 , the tire noise reduction device mounted on an inner surface of a tread portion of the tire.
18. A pneumatic tire comprising:
the tire noise reduction device according to claim 1 ; and
an adhesive with which the tire noise reduction device is fixed to an inner surface of a tread portion of the tire.