Pneumatic radial tire with noise suppressing rubber sheet in the bead region
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United States of America Patent
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-
Jun 22, 1993
Issued Date -
N/A
app pub date -
Aug 16, 1991
filing date -
Dec 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic radial tire having a rubber sheet incorporated in a region lying between a bead core and at least an outer surface portion of the bead portion which is in contact with a rim on which the tire is mounted, to suppress the noise generation. The rubber sheet has a dynamic modulus of elasticity at 20.degree. C., E'(20.degree. C.), of 6.0 MPa to 14.0 MPa and a ration of the dynamic modulus E'(20.degree. C.) to a dynamic modulus of elasticity at 60.degree. C., E'(60.degree. C.), namely E'(20.degree. C.)/E'(60.degree. C.), of at least 1.2 but less than 1.4.
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