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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve the problems of reduced rigidity of the tread, poor handling and stability, difficulties, etc., to achieve snowy roads Performance improvement, handling stability improvement, effect of large snow column shear force

Active Publication Date: 2014-12-24
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, there is a problem that the rigidity of the tread portion is reduced and the handling stability performance is deteriorated.
In this way, handling stability performance and snow road performance have an inverse relationship, and it is difficult to improve both performances in a balanced manner.

Method used

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Examples

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Embodiment Construction

[0023] Hereinafter, one embodiment of the present invention will be described based on the drawings.

[0024] Such as figure 1 As shown above, it is preferable to use, for example, a studless tire as the pneumatic tire (hereinafter, sometimes simply referred to as a "tire") of the present embodiment. The tread portion 2 of the tire is provided with: a pair of central main grooves 3, 3 extending continuously in the tire circumferential direction on both sides of the tire equator C; A pair of shoulder main grooves 4, 4 extending groundwardly. In this embodiment, the tread portion 2 is provided with: a plurality of intermediate transverse grooves 5 connecting the central main groove 3 and the shoulder main groove 4; Shoulder groove 6.

[0025] The tread portion 2 of the present embodiment is provided with: a central land portion 7 divided by a pair of central main grooves 3, 3; a pair of central block rows 8R formed by the central main groove. 3. A plurality of intermediate b...

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Abstract

The invention provides a pneumatic tire which sustains operation stability and improves snow road performance. The tread part (2) of the pneumatic tire is provided with central main groove (3), tire shoulder main grooves (4) and central transverse grooves (5). Each central main groove (3) has a sawtooth shape which is obtained through alternately configuring long-side parts (10) and short-side parts (11), wherein the long-side parts (10) incline to one side relative to the circumferential direction of the tire, and the short-side parts (11) incline to a direction which opposes the long-side parts (10). The inside of each central transverse groove in the axial direction of the tire is communicated with the long-side part (10) of the central main groove (3). Each central transverse groove (5) is provided with the components of: an inside part (14) which is located from an axially middle position of the tire to the axially inside position of the tire; and an outside part (15) which is located from the axially middle position of the tire to the axially outside position of the tire. The average groove depth of the outside part (15) is smaller than that of the inside part (14).

Description

technical field [0001] The present invention relates to a pneumatic tire which maintains handling stability and improves performance on snowy roads. Background technique [0002] Pneumatic tires for winter use are used not only on snowy roads but also on dry roads, etc. Furthermore, it is desired that such a winter pneumatic tire not only improves the performance on snowy roads but also improves the steering stability performance. [0003] For example, in order to improve performance on snowy roads, it has been proposed to increase the volume of lateral grooves in the tread portion for the purpose of increasing snow column shear force. However, in this method, there is a problem that the rigidity of the tread portion is reduced and the steering stability performance is deteriorated. In this way, the handling stability performance and the snow road performance have an inverse relationship, and it is difficult to improve both performances in a balanced manner. The following...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/13
Inventor 二宫浩彰山本爱子
Owner SUMITOMO RUBBER IND LTD