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.
Claims15
A tire-rim assembly formed by assembling a pair of bead cores of a passenger vehicle pneumatic radial tire having a carcass, which includes a ply of cords radially arranged and toroidally provided between the pair of bead cores, a belt and a bead filler disposed outside the bead cores in a tire radial direction, wherein:
- the radial tire comprises an inner liner on a tire inner surface;
- the radial tire is a tubeless tire;
- the tire-rim assembly is applied with internal pressure of at least 250 kPa and less than 350 kPa and is filled only with gas,
- a tire cross-sectional width SW is greater than or equal to 145 (mm) and less 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,
- a ratio of the tire cross-sectional width SW to a rim outer diameter D, SW/D, is greater than 0.3 and less than 0.36,
- an aspect ratio of the passenger vehicle pneumatic radial tire is greater than or equal to 50 and less than or equal to 70,
- a bead filler tire-width-direction cross-sectional area S1 is one to four times a size of a bead core tire-width-direction cross-sectional area S2,
- the bead filler is a high-rigidity member having 100% modulus at room temperature at 24 to 31 MPa,
- the belt comprises a belt cord with Young's modulus of 45,000 MPa or higher,
- the rim outer diameter D is in a range of 18 to 19 inches, and
- the tire outer diameter OD is in a range of 653.1 mm to 671.1 mm.
A tire-rim assembly formed by assembling a pair of bead cores of a passenger vehicle pneumatic radial tire having a carcass, which includes a ply of cords radially arranged and toroidally provided between the pair of bead cores, a belt and a bead filler disposed outside the bead cores in a tire radial direction, wherein:
- the radial tire comprises an inner liner on a tire inner surface;
- the radial tire is a tubeless tire;
- the tire-rim assembly is applied with internal pressure of at least 250 kPa and less than 350 kPa and is filled only with gas,
- a tire cross-sectional width SW is greater than or equal to 145 (mm),
- the tire cross-sectional width SW and a tire outer diameter OD satisfy a relational expression:
- OD≥−0.0187×SW2+9.15×SW−380,
- a ratio of the tire cross-sectional width SW to a rim outer diameter D, SW/D, is greater than 0.3 and less than or equal to 0.40,
- an aspect ratio of the passenger vehicle pneumatic radial tire is greater than or equal to 50 and less than or equal to 70,
- a bead filler tire-width-direction cross-sectional area S1 is one to four times a size of a bead core tire-width-direction cross-sectional area S2,
- the rim outer diameter D is in a range of 18 to 22 inches, and
- the tire outer diameter OD is in a range of 638.7 mm to 751.3 mm.
A tire-rim assembly formed by assembling a pair of bead cores of a passenger vehicle pneumatic radial tire having a carcass, which includes a ply of cords radially arranged and toroidally provided between the pair of bead cores, a belt and a bead filler disposed outside the bead cores in a tire radial direction, wherein:
- the radial tire comprises an inner liner on a tire inner surface;
- the radial tire is a tubeless tire;
- the tire-rim assembly is applied with internal pressure of at least 250 kPa and less than 350 kPa and is filled only with gas,
- a tire cross-sectional width SW is greater than or equal to 145 (mm),
- the tire cross-sectional width SW and a tire outer diameter OD satisfy a relational expression:
- OD≥22.135×SW+282.3,
- a ratio of the tire cross-sectional width SW to a rim outer diameter D, SW/D, is greater than 0.3 and less than or equal to 0.40,
- an aspect ratio of the passenger vehicle pneumatic radial tire is greater than or equal to 50 and less than or equal to 70,
- a bead filler tire-width-direction cross-sectional area S1 is one to four times a size of a bead core tire-width-direction cross-sectional area S2,
- the bead filler is a high-rigidity member having 100% modulus at room temperature at 24 to 31 MPa,
- the belt comprises a belt cord with Young's modulus of 45,000 MPa or higher,
- the rim outer diameter D is in a range of 18 to 22 inches, and
- the tire outer diameter OD is in a range of 638.7 mm to 751.3 mm.
Dependencies are inferred from the claim text.