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Heavy-load pneumatic tire

A pneumatic tire and tire technology, which is applied in the field of tread patterns to prevent wet grip performance and block defects, improve snow driving performance and handling stability, and improve traction and handling stability.

Inactive Publication Date: 2009-04-01
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As mentioned above, regarding the heavy-duty pneumatic tires that can improve the opposite performance of low-noise performance and on-snow performance, there is no performance that can fully satisfy the level of demand in recent years.

Method used

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  • Heavy-load pneumatic tire

Examples

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Embodiment Construction

[0039] Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 1 is a plan view showing a tread pattern of a tread portion of a heavy-duty pneumatic tire (hereinafter simply referred to as tire) 1 according to the present invention, which is planarly developed. The tread T between the tread edges E, E of the tire 1 is formed by one or more radii of curvature in a section including the tire axis. Further, the tread T is divided into blocks 4 by providing a plurality of longitudinal grooves 2 extending in the tire circumferential direction and a plurality of lateral grooves 3 extending in a direction intersecting the longitudinal grooves 2 . On the side or both sides of the ditch wall facing the vertical ditch whose groove width W2 is the widest or the second widest in the direction perpendicular to the ditch center line, a wall ditch 5 extending along the depth direction is arranged and set as a band Groove vertical groove 2g, to achie...

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Abstract

To provide a tread pattern of a pneumatic tire for heavy load enhancing both low noise performance and on-snow performance. Longitudinal length L4C of a central block, longitudinal length L4M of an intermediate block and longitudinal length L4S of an outer block, i.e., circumferential distances of respective tires between the most projecting end points on both sides of a tire circumferential direction of the central, intermediate and outer blocks (4) are defined; and lateral length W4C of the central block, lateral length W4M of the intermediate block and lateral length W4S of the outer block, i.e., tire axial distances between the most projective terminals at both sides in a tire axial direction of the respective central, intermediate and outer blocks (4) are defined. A longitudinal length ratio of the respective blocks is made to (L4S / W4S)<(L4M / W4M)<(L4c / W4C), 1.50 B60C 11 / 117 4 15 2 2006 / 7 / 31 1907738 2007 / 2 / 7 100473547 2009 / 4 / 1 2009 / 4 / 1 2009 / 4 / 1 Sumitomo Rubber Industries, Ltd. Japan Takahashi Nobugo xu qian luo yunpo 11227 Japan 2005 / 8 / 4 2005-226922

Description

technical field [0001] The present invention relates to a heavy-duty pneumatic tire having improved both low-noise performance and on-snow performance, and particularly relates to a tread pattern of an all-season heavy-duty pneumatic tire. Background technique [0002] With regard to heavy-duty pneumatic tires used for heavy-duty vehicles such as trucks and buses, there is a great demand for all-season tires having on-snow performance that can run on snow-covered roads. This heavy-duty all-season tire has a block pattern to improve performance on snow. And, with the improvement of vehicle performance, especially the increase of horsepower, it is necessary to further improve the on-snow performance. [0003] It is known that the on-snow performance tends to be improved when the number of lateral grooves and vertical grooves and the groove volume are increased. On the other hand, all-season tires are required to have low-noise performance in order to run on dry roads in many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/117
Inventor 高桥伸吾
Owner SUMITOMO RUBBER IND LTD
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