Run-flat tire
A run-flat tire is provided with: a carcass layer mounted between a pair of bead portions; and a run-flat reinforcing layer having a crescent-shaped cross-section, provided on a side wall portion on an inner side of the carcass layer in a tire width direction, a band-like sound absorbing member that extends in a tire circumferential direction adhering to a region of a tire inner surface corresponding to a tread portion, wherein the band-like sound absorbing member is locally arranged in at least one shoulder region within the region corresponding to the tread portion.
1. A run-flat tire comprising:
a carcass layer mounted between a pair of bead portions;
a run-flat reinforcing layer having a crescent-shaped cross-section, provided on a side wall portion on an inner side of the carcass layer in a tire width direction, and
a band-like sound absorbing member that extends in a tire circumferential direction adhering to a region of a tire inner surface corresponding to a tread portion, wherein
the band-like sound absorbing member is only locally arranged in at least one shoulder region within the region corresponding to the tread portion,
a thickness D of the band-like sound absorbing member and a width W of the band-like sound absorbing member satisfy a relationship such that D≥W,
the tread portion comprises at least one circumferential groove in the at least one shoulder region, the at least one circumferential groove being a laterally outermost circumferential groove of the tread portion, and
the band-like sound absorbing member is disposed entirely laterally outward of the at least one circumferential groove.
2. The run-flat tire according to claim 1 , wherein
an outer end in the tire width direction of an outer circumferential surface of the band-like sound absorbing member is disposed in a region between a maximum width position and a minimum width position of a tolerance rim.
3. The run-flat tire according to claim 2 , wherein
the thickness D of the band-like sound absorbing member is from 20% to 70% of a tire cross-sectional height SH.
4. The run-flat tire according to claim 3 , wherein
an inner circumferential surface of the band-like sound-absorbing member has a plurality of notches.
5. The run-flat tire according to claim 4 , wherein
the band-like sound absorbing member has a missing portion in at least one location in the tire circumferential direction.
6. The run-flat tire according to claim 5 , wherein
a circumferential length of an outer circumferential surface of the band-like sound absorbing member is longer than a circumferential length of an inner circumferential surface of the band-like sound absorbing member.
7. The run-flat tire according to claim 1 , wherein
a thickness D of the band-like sound absorbing member is from 20% to 70% of a tire cross-sectional height SH.
8. The run-flat tire according to claim 1 , wherein
an inner circumferential surface of the band-like sound-absorbing member has a plurality of notches.
9. The run-flat tire according to claim 1 , wherein
the band-like sound absorbing member has a missing portion in at least one location in the tire circumferential direction.
10. The run-flat tire according to claim 1 , wherein
a circumferential length of an outer circumferential surface of the band-like sound absorbing member is longer than a circumferential length of an inner circumferential surface of the band-like sound absorbing member.