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Pneumatic-tyre

A technology of pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve problems such as increased noise

Inactive Publication Date: 2003-11-19
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, the increase of the groove area will cause the so-called pumping sound due to the compressed air between the tire tread and the road surface flowing out to the outside through the transverse main groove. There is a problem of making the noise louder, such as the air column resonance sound in the longitudinal main groove excited by the pumping sound

Method used

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Examples

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Embodiment Construction

[0018] An example of the implementation of the present invention will be described below together with the illustrated example.

[0019] FIG. 1 is a developed view of a tire tread pattern when the pneumatic tire of the present invention is a mud and snow tire mounted on a four-wheel drive vehicle traveling on bad road conditions.

[0020] In FIG. 1 , a pneumatic tire 1 has, on a tire tread 2 , a tire equator that includes 15% of the tire tread contact width TW from the equator C to the wheel axis direction on both sides. At least one central longitudinal main groove 3 in the region Yc and the outer longitudinal main groove 4 extending in the wheel circumferential direction on the outer side in the tire axial direction are in the middle formed by the intermediate block 6 formed by connecting the transverse main groove 5 . Block column Rm.

[0021] In this embodiment, the case where one (a total of two) longitudinal main grooves 3 on the center side are arranged on each side of...

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Abstract

A pneumatic tire is provided in the tread portion with a circumferential row (Rm) of middle tread elements (6), wherein each of the middle tread elements (6) is divided into four elemental blocks (6A1,6A2,6B1,6B2) having different configurations, by three splitting grooves, and the three splitting grooves are: a longitudinal splitting groove (9) extending between the lateral main grooves (5): an axially inner lateral splitting groove (10) extending axially outwardly from the axially inner circumferential main groove (3) beyond the longitudinal splitting groove (9) and terminating before the axially outer circumferential main groove (4); and an axially outer lateral splitting groove (11) extending axially inwardly from the axially outer circumferential main groove (4) beyond the longitudinal splitting groove (9) and terminating before the axially inner circumferential main groove (3).

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for use as a tire for four-wheel drive vehicles running on bad road conditions, and improves the water surface skid performance while slightly maintaining the noise performance. Background technique [0002] Pneumatic tires for mud and snow installed on four-wheel drive vehicles running on bad road conditions must form a larger longitudinal main body extending in the direction of the wheel circumference in order to fully ensure water surface skid performance and mud (mud) performance. The ratio of the groove area of ​​the groove and the transverse main groove intersecting with it to the tire tread (groove area ratio). [0003] However, the increase of the groove area will cause the so-called pumping sound due to the air compressed between the tire tread and the road surface flowing out through the horizontal main groove to the outside, and the air in the longitudinal main groove excited by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/04B60C11/11B60C11/12B60C11/13
CPCB60C11/11Y10S152/03B60C2011/1213B60C11/13B60C11/12B60C11/0306
Inventor 君嶋园子
Owner SUMITOMO RUBBER IND LTD
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