Pneumatic tire

Abstract

A pneumatic tire is provided which includes a plurality of drainage grooves positioned on each side of a tire equator line that extend at an angle in a direction opposite a rotating direction while curving outward in a tire width direction in a tread portion, with an end of a leading edge closed and an end of a trailing edge open to a tire side. A plurality of sub grooves extending from the drainage grooves in the rotating direction is provided, where an end of the leading edge is closed. The drainage grooves and the sub grooves are arranged so that spacings W1, W2, and W3 gradually increase outward in the tire width direction, groove area ratios RA to RE satisfy the relationships |RB-RA|@9%, RA>RC>RD, and RB>RE, and a groove depth of the drainage grooves in the center region is greater than that in the shoulder portion.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for use as a racing tire, and more particularly, to a pneumatic tire capable of improving running performance when going straight and when turning on a wet road surface while improving uneven wear resistance and heating performance. Background technique [0002] As wet tires for racing cars, tires with a plurality of main grooves extending in the tire circumferential direction are generally used in the tread portion. It has been recognized that this type of tire will exhibit excellent driving performance on wet roads based on the water drainage capacity of the main grooves. However, in a racing car running at high speed, if the tire has a tread pattern mainly composed of main grooves extending in the circumferential direction of the tire, no water will be drained through the main grooves, and the amount of water pushed back to the front will increase. Moreover, this is also the main reason for...

AI Technical Summary

Problems solved by technology

[0004] However, when the tread portion is divided into a plurality of blocks by the main grooves and inclined grooves as described above, the rigidity of the tread portion decreases.

In racing cars, the load applied to the tires during braking / driving and turning increases, so if the rigidity of the tread portion is not sufficient, there is a problem that braking / driving performance and cornering performance required for wet roads cannot be exhibited.

[0005] Furthermore, in recent years, in addition to the above-mentioned driving performance when driving straight on wet roads and when turning, there has been a problem that the desired tire performance cannot be obtained due to uneven tire wear. In order to solve the above problems, it is required to improve uneven wear resistance.

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