Tire

A tire and tire circumferential technology, applied in the field of tread patterns, can solve problems such as humming, and achieve the effect of reducing pitch noise and realizing white noise.

Active Publication Date: 2019-07-05
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The tire of Patent Document 1 mentioned above reduces the pitch noise during running, but has the problem of easily generating humming noise.

Method used

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Embodiment Construction

[0060] Hereinafter, one embodiment of the present invention will be described based on the drawings.

[0061] figure 1 It is a developed view showing an example of the tread portion 2 of the tire 1 . A tread pattern 3 is provided on the tread portion 2 of the tire 1 of the present embodiment.

[0062] The tread pattern 3 is formed by repeatedly arranging at least two pattern constituent units 4 having different lengths L in the tire circumferential direction in the tire circumferential direction. Thereby, a pitch variation (pitch variation) is formed in the tread portion 2, so noise during running can be reduced. The type of the pattern constituting unit 4 can be appropriately set according to the conditions of the vehicle on which the tire 1 is mounted and the conditions of the road surface, for example. The pattern constituting units 4 are preferably, for example, about 2 to 10 types. This embodiment exemplifies the case where there are five pattern constituent units 4 ....

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Abstract

The invention provides a tire capable of suppressing the beat noise during running. A tread portion has a tread pattern comprising a row in which at least two kinds of pattern constituting units different in length in a tire circumferential direction are arranged in the tire circumferential direction. The row of the pattern constituting unit is replaced with a pulse train in which each pattern constituting unit is a pulse having a size corresponding to the length the pulse and the pulse is arranged in the sequence of an array starting from one pattern constituting unit and the length of each attern constituting unit. The size of each pulse is defined by a ratio of the length of a pattern constituting unit corresponding to the pulse to a median value of the lengths of the at least two kindsof pattern constituting units. The average value of the size of the pulse corresponding to at least two pattern constituent units is 1.00. The maximum value Fmax of amplitude Fk in the one to k-th order amplitude obtained by Fourier transforming a pulse train is limited to a predetermined range, and an amplitude Fk equal to or more than 2 / 3 of the maximum value Famx is not continuous in an adjacent order.

Description

technical field [0001] The present invention relates to a tire having a tread pattern in which pattern constituent units are repeatedly arranged in the tire circumferential direction on a tread portion. Background technique [0002] Tires having various tread patterns according to conditions of vehicles and road surfaces on which the tires are mounted have been proposed. In the tread pattern, for example, pattern constituting units composed of grooves and blocks adjacent to the grooves are repeatedly arranged along the tire circumferential direction. It is known that in such a tire, if the pattern constituting units are formed with the same size, harsh noise (for example, pitch noise) will be generated during running. [0003] Patent Document 1 below proposes a tire with reduced pitch noise. In the tire of Patent Document 1 below, each pattern constituting unit is defined as a pulse, and the amplitude P(k) obtained by Fourier transforming a pulse train separated by the len...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03
CPCB60C11/03
Inventor 佐佐木达矢上田江美田中正俊宫泽贤荻原佐和早苗隆平
Owner SUMITOMO RUBBER IND LTD
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