Pneumatic tire

Abstract

A bead portion 4 of a pneumatic tire 1 includes a vertical rising surface portion which is connected to a bead base surface Sb through an arc bead heel surface Sh, and a straight or convex arc flange receiving surface portion Sw 2 which is diagonally extending from the rising surface portion radially outward and axially outward of the tire. In a normal internal pressure in which no load is applied, the flange receiving surface portion Sw 2 is not in contact with a flange surface Rf, and in a load state in which 50% or more of normal load is applied, the flange receiving surface portion Sw comes into contact with the flange surface Rf.

Description

technical field

[0001] The present invention relates to a pneumatic tire whose handling stability is improved without reducing driving comfort when it is applied to a state with a heavy load such as high-speed cornering. Background technique

[0002] In conventional pneumatic tires, as indicated Figure 5 As shown, the cross-sectional shape of the bead portion a is made to match the cross-sectional shape of the inner surface of the rim R. More specifically, the outer wall surface Sw of the bead portion a supported by the flange surface Rf of the rim R includes a vertically rising surface portion s1 rising along the heel surface Sh, and an outer end of the rising surface portion s1 A concavely arcuate surface s2 extending in a concavely arcuate form. The radial height ja of the rising surface portion s1 along the bead base line BL is substantially equal to the height jf of the vertical surface portion Rf1 in the rim surface Rf, and the radius o...

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