Pneumatic radial tire for a passenger vehicle and method of using the same
AssigneeBridgestone Corporation
InventorsIsao KUWAYAMA, Hiroyuki MATSUMOTO, Shintaro HATANAKA
Life of this patent
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Abstract
A pneumatic radial tire for a passenger vehicle according to the present invention has an appropriate relationship between a tire cross-sectional width SW and a tire outer diameter OD. Also, a method of using the pneumatic radial tire for a passenger vehicle according to the present invention is to use the above radial tire with at least specified internal pressure.
Claims4
A passenger vehicle pneumatic radial tire including a carcass, which is composed of a ply of carcass cords radially arranged and toroidally provided between bead cores embedded in a pair of bead portions, and a pair of sidewall portions connected to the bead portions, wherein
- when the tire is mounted on a rim and applied with internal pressure of at least 250 kPa,
- with a tire cross-sectional width SW of smaller than 165 (mm), a ratio of the tire cross-sectional width SW to a tire outer diameter OD, SW/OD, is no more than 0.26,
- with the tire cross-sectional width SW of 165 (mm) or larger, the tire cross-sectional width SW and the tire outer diameter OD satisfy a relational expression:
- OD≧2.135×SW+282.3, and
- a ratio Ts/Tb is 15% to 40%, the Ts representing a gauge of the sidewall portion in a tire maximum width portion and the Tb representing a bead width of the bead core in a tire radial direction center position.
A passenger vehicle pneumatic radial tire including a carcass, which is composed of a ply of carcass cords radially arranged and toroidally provided between bead cores embedded in a pair of bead portions, and a pair of sidewall portions connected to the bead portions, wherein
- when the tire is mounted on a rim and applied with internal pressure of at least 250 kPa, a tire cross-sectional width SW and a tire outer diameter OD satisfy a relational expression:
- OD≧−0.0187×SW2+9.15×SW−380, and
- a ratio Ts/Tb is 15% to 40%, the Ts representing a gauge of the sidewall portion in a tire maximum width portion and the Tb representing a bead width of the bead core in a tire radial direction center position.
Dependencies are inferred from the claim text.