Heavy duty radial tire wherein bead toe lifting is prevented

Details Heavy duty radial tire wherein bead toe lifting is prevented Heavy duty radial tire wherein bead toe lifting is prevented

1992-09-16

1995-06-13

Johnstone, Adrienne

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152539, 152540, 152548, B60C 300, B60C 902, B60C 1502, B60C 1504

Patent

active

054233666

ABSTRACT:
A heavy duty radial tire improved in bead durability and airtightness, which comprises a pair of axially spaced bead portions having a bead base to fit with a 15.degree. tapered bead seat of its regular rim, and a bead core disposed in each of the bead portions, the bead core having a polygonal cross sectional shape having an axially inner vertex point (Q1) and an axially outer vertex point (Q2) and a side (L1) extending between the points (Q1 and Q2), the side (L1) being adjacent to and substantially parallel with the bead base, the maximum section width (CW) of the bead core in the direction parallel with the side (L1) being in the range of 0.063 to 0.105 times the rim width (RW) between the bead heel points (P), the axial distance (A) of the axially inner point (Q1) from the bead heel point (P) being 0.073 to 0.125 times the rim width (RW).

REFERENCES:
patent: 4192368 (1980-03-01), Maiocchi
patent: 4319622 (1982-03-01), Iuchi et al.
patent: 4387758 (1983-06-01), Matsuda et al.
patent: 4408648 (1983-10-01), Ohashi
patent: 5025844 (1991-06-01), Ueda et al.
patent: 5277237 (1994-01-01), Tagashira
Patent Abstracts of Japan vol. 7, No. 217 (M-245) (1362) 27 Sep. 1983 & JP-A-58 112 810 (Yokohama Gomu K.K.) Jul. 1983.

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