Pneumatic tire

Abstract

In order to improve fuel economy while ensuring driving stability, a pneumatic tire is provided with one carcass ply, two belt plies, and one band ply, and satisfies the following: Wt <= -0.7257*(Db)<2> + 42.763*Db - 339.67 ---(1); Wt >= -0.7257*(Db)<2>+ 48.568*Db - 552.33 ---(2); Dt <= 59.078 Wt<0.498> ---(3); Dt >= 59.078*Wt<0.467> ---(4), where Wt (unit: mm) is the tire cross section width, Db (unit: inches) is the bead diameter, and Dt (unit: mm) is the tire outer diameter, with a carcass cord being made of an aramid fiber cord.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of ensuring steering stability while improving fuel consumption. Background technique [0002] The main factors related to tire fuel consumption are rolling resistance and air resistance of the tire. The main cause of tire rolling resistance is energy loss due to repeated deformation of the rubber while driving. In order to reduce this rolling resistance, the use of tread compounds with low energy loss (low tan δ) is advocated. [0003] When a tread compound having low energy loss is used, although rolling resistance is reduced, grip performance (especially wet grip performance) is lowered, and there is also a problem that wear resistance deteriorates. As shown in Patent Documents 1 and 2 below, studies have been conducted on tread rubber compositions having reduced rolling resistance while improving wear resistance. However, relying only on the improvement of the rubber composition cannot pr...

AI Technical Summary

Problems solved by technology

Therefore, the lateral rigidity of the tire is also reduced, and there is a new problem that should be solved in that the lateral rigidity is reduced and the steering stability is reduced.

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