Pneumatic tire
A pneumatic tire includes a band-shaped sound absorbing member bonded along a tire circumferential direction to the tire inner surface in a tread portion; at least one full cover layer covering the entire width of belt layers on the outer circumferential side of the belt layers; and a center cover layer disposed on the outer circumferential side of the full cover layer, the center cover layer locally covering the tire lateral direction center region of the belt layers; a width SW of the band-shaped sound absorbing member and a width BW of the belt layers satisfying a relationship SW/BW=0.3 to 0.8, and a width CW of the center cover layer and the width SW of the band-shaped sound absorbing member satisfying the relationship CW/SW=0.05 to 0.35.
1. A pneumatic tire, comprising:
an annular-shaped tread portion extending in a tire circumferential direction;
a pair of sidewall portions disposed on either side of the tread portion;
a pair of bead portions disposed inward of the sidewall portions in a tire radial direction;
a carcass layer mounted between the pair of bead portions;
a plurality of belt layers disposed on an outer circumferential side of the carcass layer in the tread portion;
a band-shaped sound absorbing member bonded to a tire inner surface in the tread portion along the tire circumferential direction;
at least one full cover layer disposed on an outer circumferential side of the plurality of belt layers and covering a full width of the plurality of belt layers; and
a center cover layer disposed on an outer circumferential side of the full cover layer and locally covering a center region of the plurality of belt layers in a tire lateral direction;
a width SW of the band-shaped sound absorbing member and a width BW of the plurality of belt layers satisfying a relationship SW/BW=0.3 to 0.8, and
a width CW of the center cover layer and the width SW of the band-shaped sound absorbing member satisfying a relationship CW/SW=0.05 to 0.35.
2. The pneumatic tire according to claim 1 , wherein
a mounting direction with respect to a vehicle is designated;
when the pneumatic tire is mounted on the vehicle, an outer side of a tire equator with respect to the vehicle is a vehicle outer side, and when the pneumatic tire is mounted on the vehicle, an inner side of the tire equator with respect to the vehicle is a vehicle inner side; and
a width SW OUT of a portion of the band-shaped sound absorbing member on the vehicle outer side, a width SW IN of a portion of the band-shaped sound absorbing member on the vehicle inner side, and the width CW of the center cover layer satisfy relationships SW IN /CW<5, SW OUT /CW<8, and SW IN /SW OUT <0.9.
3. The pneumatic tire according to claim 1 , wherein
a mounting direction with respect to a vehicle is designated;
when the pneumatic tire is mounted on the vehicle, an outer side of a tire equator with respect to the vehicle is a vehicle outer side, and when the pneumatic tire is mounted on the vehicle, an inner side of the tire equator with respect to the vehicle is a vehicle inner side; and
a cross-sectional area SA OUT of a portion of the band-shaped sound absorbing member on the vehicle outer side, a cross-sectional area SA IN of a portion of the band-shaped sound absorbing member on the vehicle inner side, and a cross-sectional area T of a tire cavity satisfy relationships 0≤SA IN /t≤0.2 and 0.1≤SA OUT /t≤0.4 (t=T/2).
4. The pneumatic tire according to claim 1 , wherein the center cover layer is made from organic fiber cords in which nylon fiber and aramid fiber are intertwined.
5. The pneumatic tire according to claim 1 , wherein
the band-shaped sound absorbing member comprises a missing portion at at least one section in the tire circumferential direction.
6. The pneumatic tire according to claim 2 , wherein
a mounting direction with respect to a vehicle is designated;
when the pneumatic tire is mounted on the vehicle, an outer side of a tire equator with respect to the vehicle is a vehicle outer side, and when the pneumatic tire is mounted on the vehicle, an inner side of the tire equator with respect to the vehicle is a vehicle inner side; and
a cross-sectional area SA OUT of a portion of the band-shaped sound absorbing member on the vehicle outer side, a cross-sectional area SA IN of a portion of the band-shaped sound absorbing member on the vehicle inner side, and a cross-sectional area T of a tire cavity satisfy relationships 0≤SA IN /t≤0.2 and 0.1≤SA OUT /t≤0.4 (t=T/2).
7. The pneumatic tire according to claim 6 , wherein the center cover layer is made from organic fiber cords in which nylon fiber and aramid fiber are intertwined.
8. The pneumatic tire according to claim 7 , wherein
the band-shaped sound absorbing member comprises a missing portion at at least one section in the tire circumferential direction.