Reinforced bead portion for pneumatic tires

Details Reinforced bead portion for pneumatic tires Reinforced bead portion for pneumatic tires

1976-11-24

1978-05-09

Reese, Randolph A.

Resilient tires and wheels

Tires, resilient

Patches

152354R, B60C 1504

Patent

active

040881695

ABSTRACT:
A reinforced bead portion for pneumatic tires used under heavy load and high flexural conditions, which can efficiently alleviate the stress subjected to a pair of bead cores each composed of at least two bead cores is disclosed. At least the inside bead core of the reinforced bead portion comprises a sector-shaped stress absorbing rubber layer included between two straight radial lines diverging from a center of the bead core, one of the these straight lines being inclined at an angle of 120.degree. to 135.degree. with respect to the other line. The stress absorbing rubber layer has a maximum thickness at its center which is 0.7 to 6, preferably 1 to 2.5 times the diameter of a metal cord of the bead core and a hardness which is at least equal to that hardness of a coating rubber of either one of a rubberized metal cord layer and a rubberized fabric for covering the rubberized metal cord layers which is lower than the hardness of the other.

REFERENCES:
patent: 2971553 (1961-02-01), Woodall
patent: 3921693 (1975-11-01), Suzuki et al.
patent: 3949800 (1976-04-01), Lejeune

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