Pneumatic tire

Abstract

Provided is a pneumatic tire which makes it possible to reduce tire weight and to balance steering stability and fuel efficiency performance. A pneumatic tire equipped with a tread section, a sidewall section, and bead sections, and having one or more carcass layers mounted between the pair of bead sections, wherein: the ratio (SW / OD) of the overall tire width (SW) to the tire outer diameter (OD) satisfies the relationship SW / OD <= 0.3; and the ratio (SA / a) satisfies the relationship 7.5 <= SA / a <= 11.5, and the groove surface area ratio (GR) of the ground-contact region of the tread section is 25% or less, when a first region (A) is demarcated between a pair of first boundary lines (L1, L1), a second region (B) is demarcated between the first boundary lines (L1) and a second boundary line (L2), a third region (C) is demarcated on the bead toe side of the second boundary line (L2), the cross-sectional areas (mm2) of the first region (A) through the third region (C) are SA, SB and SC, respectively, and the periphery lengths (mm) along the tire inner surface of the first region (A) through the third region (C) are a, b and c, respectively.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as a standard tire mounted on a passenger car, and more specifically, to a pneumatic tire capable of reducing tire weight and achieving both steering stability and low fuel consumption performance. Background technique [0002] Conventionally, various methods of reducing the rolling resistance of pneumatic tires have been proposed in order to contribute to the low fuel consumption performance of automobiles. In particular, in recent years, as environmental considerations have increased, there has been a demand for pneumatic tires that contribute highly to the reduction in fuel consumption of automobiles. [0003] As a method of reducing the rolling resistance of a pneumatic tire, it is known to reduce the air resistance around the tire by reducing the overall tire width (SW) to reduce the front projected area (for example, refer to Patent Document 1). [0004] However, in the above-mentioned m...

AI Technical Summary

Problems solved by technology

[0005] When the ground contact width of the pneumatic tire is narrowed in this way, there is a danger that the side reaction force (cornering force) will decrease, and thus the steering stability will decrease.

On the other hand, it is conceivable to reduce the ratio of the groove area of ​​the tread portion for the purpose of securing the handling stability, but in this case, due to the increase in tire weight, the low fuel consumption performance cannot be fully exerted.

Therefore, even if the air resistance is reduced due to the narrower width / larger diameter of the pneumatic tire, it is difficult to achieve both handling stability and low fuel consumption performance

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