Tire noise reduction device and pneumatic tire
A tire noise reduction device includes a noise absorbing member formed of a porous material, a band member formed of a thermoplastic resin, the band member being an annular shape for mounting the noise absorbing member on a tire inner surface, a bonding member bent into a V-shaped cross section, and a band bonding section at a key point where the noise absorbing member, the band member, and the bonding member are bonded by interposing the noise absorbing member between the bonding member and the band member. The band member has a band width WB satisfying the following formula (a). A band thickness H (mm) of the band bonding section and a thickness h (mm) of the band member have a relationship satisfying the following formula (b). 20 mm≤ WB ≤noise absorbing member width (mm) (a) 0.4≤ H/h ≤0.9 (b)
1. A tire noise reduction device comprising:
a noise absorbing member formed of a porous material;
a band member formed of a thermoplastic resin, the band member being formed in an annular shape in a tire circumferential direction for mounting the noise absorbing member on a tire inner surface;
a bonding member bent into a V-shaped cross section; and
a band bonding section at a key point where the noise absorbing member, the band member, and the bonding member are bonded by interposing the noise absorbing member between the bonding member and the band member; wherein
the band member has a band width WB satisfying the following formula (a),
a band thickness H (mm) of the band bonding section and a thickness h (mm) of the band member have a relationship satisfying the following formula (b), and
a band cross section area A with a cross section perpendicular to a band length direction at a band bonding position is greater than 20 mm 2 ,
20 mm≤ WB ≤noise absorbing member width (mm) (a)
0.4≤ H/h≤ 0.9 (b).
2. The tire noise reduction device according to claim 1 , wherein a yield strength of a band section at the band bonding position under an 80° C. environment is 330 N or greater.
3. The tire noise reduction device according to claim 1 , wherein the band bonding section is provided in at least two locations relative to the noise absorbing member.
4. The tire noise reduction device according to claim 1 , wherein a position of the band bonding section is 30 to 80 mm from an end portion of the noise absorbing member.
5. The tire noise reduction device according to claim 1 , wherein bonding of the noise absorbing member with the band member and the bonding member is carried out by ultrasonic welding.
6. The tire noise reduction device according to claim 1 , wherein the band member and the bonding member are formed of the same synthetic resin material.
7. A pneumatic tire, comprising: the tire noise reduction device described in claim 1 disposed in a tire cavity space using the band member.
8. The pneumatic tire according to claim 7 , wherein an inner diameter (radius) R of the tire and an annular shape outer diameter (radius) r of the band member formed in the annular shape have a relationship which satisfies the following formula (c),
0.9≤ R/R≤ 0.99 (c).
9. The tire noise reduction device according to claim 2 , wherein the band bonding section is provided in at least two locations relative to the noise absorbing member.
10. The tire noise reduction device according to claim 9 , wherein a position of the band bonding section is 30 to 80 mm from an end portion of the noise absorbing member.
11. The tire noise reduction device according to claim 10 , wherein bonding of the noise absorbing member with the band member and the bonding member is carried out by ultrasonic welding.
12. The tire noise reduction device according to claim 11 , wherein the band member and the bonding member are formed of the same synthetic resin material.
13. A pneumatic tire, comprising: the tire noise reduction device described in claim 12 disposed in a tire cavity space using the band member.
14. The pneumatic tire according to claim 13 , wherein an inner diameter (radius) R of the tire and an annular shape outer diameter (radius) r of the band member formed in the annular shape have a relationship which satisfies the following formula (c),
0.9≤ R/R≤ 0.99 (c).