Abstract A pneumatic radial tire having a circular bead core of substantially polygonal cross section which includes a base (a) adjacent an inclined bead base portion of the tire, an inner side (b) on a side of the bead core nearest a bead toe portion of the tire, an outer side (d) on a side of the bead core nearest a bead heel portion of the tire, and a top side (c) opposite the base (a) and joining the inner side (b) and the outer side (d). An inclination θ 1 of the base (a) relative to the axial direction of the tire is substantially the same as that of the bead base portion relative to the axial direction of the tire. A cross angle β between the base (a) and the inner side (b) is 70° to 90°. An inclination θ 2 of the top side (c) relative to the axial direction of the tire is smaller than the inclination θ 1 and the direction of inclination of the top side (c) is opposite to that of the base (a).
Inventors
👤 Masahiko Kanamaru
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 14:02
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A pneumatic radial tire having a circular bead core, wherein said bead core has substantially a polygonal cross section comprising a base (a) adjacent an inclined bead base portion of said tire, an inner side (b) on a side of said bead core nearest a bead toe portion of said tire, an outer side (d) on a side of said bead core nearest a bead heel portion of said tire, and a top side (c) opposite said base (a) and joining said inner side (b) and said outer side (d), an inclination θ 1 of said base (a) relative to the axial direction of the tire is substantially the same as that of said bead base portion relative to the axial direction of the tire, a cross angle β between said base (a) and said inner side (b) is 70° to 90°, an inclination θ 2 of said top side (c) relative to the axial direction of the tire is smaller than said inclination θ 1 and the direction of inclination of said top side (c) is opposite to that of said base (a).
Claim 2
Dependent Claim
184 words
A pneumatic radial tire having a circular bead core, wherein said bead core has substantially a polygonal cross section comprising a base (a) adjacent an inclined bead base portion of said tire, an inner side (b) on a side of said bead core nearest a bead toe portion of said tire, an outer side (d) on a side of said bead core nearest a bead heel portion of said tire, and a top side (c) opposite said base (a) and joining said inner side (b) and said outer side (d), an inclination θ 1 of said base (a) relative to the axial direction of the tire is substantially the same as that of said bead base portion relative to the axial direction of the tire, a cross angle β between said base (a) and said inner side (b) is 70° to 90°, an inclination θ 2 of said top side (c) relative to the axial direction of the tire is smaller than said inclination θ 1 and the direction of inclination of said top side (c) is opposite to that of said base (a).
Claim 3
Dependent Claim
34 words
A pneumatic tire according to claim 1, wherein said inner side (b) on a side of said bead core nearest a bead toe portion of said tire is a straight line or a curve.
Claim 4
Dependent Claim
16 words
A pneumatic tire according to claim 1, wherein the inclination θ 1 is 13° to 18°.
Claim 5
Dependent Claim
16 words
A pneumatic tire according to claim 1, wherein the inclination θ 2 is 2° to 10°.
Claim 6
Dependent Claim
31 words
A pneumatic tire according to claim 1, wherein said bead core is comprised of a plurality of bead wires and each of said bead wires is circular or quadrangular in section.