Pneumatic tire

Abstract

Pneumatic tire which achieves both reduction of pattern noise and improvement in driving stability on a dry road surface characterized in that: multiple block elements arrayed in a circumferential direction of the tire are formed in each of regions sectioned by an equator of the tire in a tread portion of the tire, the regions on vehicle inner and outer sides: the number of pitches of the block elements on the vehicle inner side is set to 60 to 80; the number of pitch variations of the block elements on the vehicle inner side is set to at least 4; the number of pitches of block elements on the vehicle outer side is set to 50 to 70; the number of pitch variations of the block elements on the vehicle outer side is set to at least 4; the number of pitches of the block elements on the vehicle inner side is set larger than the number of pitches of the block elements on the vehicle outer side; and a ratio of an average pitch length of the block elements on the vehicle outer side to an average pitch length of the block elements on the vehicle inner side is set in a range of 1.05 to 1.20.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as a flat tire for SUVs (Sport Utility Vehicles), and more specifically, to a pneumatic tire capable of improving handling stability on dry roads and reducing tread pattern noise. Background technique [0002] Conventionally, a pneumatic tire has been proposed in which the installation direction of the inside and outside of the tire relative to the vehicle has been specified, in order to balance the handling stability on dry roads and wet roads, and to reduce tread pattern noise at the same time. , wherein: the number of pitches of the block pattern row is set to 30-60 in the vehicle outer region, and 45-70 in the vehicle inner region, and the pitch number P of the vehicle inner region is B Pitch number P with respect to the outside area of ​​the vehicle A ratio of P B / P A A relationship of 1.3 to 2.0 is assumed (for example, refer to Patent Document 1). [0003] However, the pitch number ...

AI Technical Summary

Problems solved by technology

[0003] However, the pitch number P of the vehicle interior area as described above B Pitch number P with respect to the outside area of ​​the vehicle A ratio of P B / P A When the relationship between 1.3 and 2.0 is set, the balance of rigidity between the vehicle outer area and the vehicle inner area becomes poor, so it is difficult to achieve both improvement of steering stability on dry roads and reduction of tread noise

That is, if the number of pitches P in the vehicle inner area is excessively increased B , there is a tendency for the handling stability on dry roads to decline. If the number of pitches P A , there is a tendency for the tread pattern noise to increase

Therefore, the status quo is that these required characteristics have not been simultaneously met

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