Pneumatic tires
AssigneeBridgestone Corporation
InventorsTetsuhito Tsukagoshi, Takeshi Watanabe, Kuninobu Kadota, Yuichiro Ogawa
Life of this patent
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Abstract
A pneumatic tire comprises a carcass comprised of at least one carcass ply containing a steel cord(s) arranged at a cord angle of 70-90° with respect to an equatorial plane of the tire and toroidally extending between a pair of bead cores and turned up around the bead core inward or outward in a radial direction to form a turnup portion, wherein a wrap part wrapping on a peripheral face of the bead core therealong is formed in the turnup portion of the carcass ply.
Claims13
In a pneumatic tire comprising a carcass comprised of at least one carcass ply containing a steel cord(s) arranged at a cord angle of 70-90° with respect to an equatorial plane of the tire and toroidally extending between a pair of bead cores and turned up around the bead core from an inside toward an outside in a radial direction to form a turnup portion, the improvement wherein a wrap part wrapping on a peripheral face of the bead core therealong is formed in the turnup portion of the carcass ply and at least one plastic deformation region is formed in the wrap part.
An apparatus for bending a carcass band for use in the manufacture of the pneumatic tire, comprising a shaft-shaped member provided with at least one annular groove supporting an end portion of a cylindrical carcass band form an inner circumferential side thereof, and at least one disc-shaped member located in position corresponding to the annular groove, and pushing the cylindrical carcass band into the annular groove.
In a pneumatic tire comprising a carcass comprised of at least one carcass ply containing a steel cord(s) arranged at a cord angle of 70-90° with respect to an equatorial plane of the tire and toroidally extending between a pair of bead cores and turned up around the bead core from an inside toward an outside in a radial direction to form a turnup portion, the improvement wherein a wrap part wrapping on a peripheral face of the bead core therealong is formed in the turnup portion of the carcass ply;
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- wherein the end of the wrap part is located inside in the radial direction over a position corresponding to an outer peripheral edge of a bead core embedded in a bead portion at a state of mounting onto a rim in the inflation under a maximum air pressure.
In a pneumatic tire comprising a carcass comprised of at least one carcass ply containing a steel cord(s) arranged at a cord angle of 70-90° with respect to an equatorial plane of the tire and toroidally extending between a pair of bead cores and turned up around the bead core from an inside toward an outside in a radial direction to form a turnup portion, the improvement wherein a wrap part wrapping on a peripheral face of the bead core therealong is formed in the turnup portion of the carcass ply;
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- wherein the tire has an aspect ratio of not more than 60%.
Dependencies are inferred from the claim text.