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Pneumatic tire

A pneumatic tire and tire technology, applied in the field of tread patterns, can solve problems such as easy increase in grip and instability

Inactive Publication Date: 2006-02-15
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, if a large number of channels are formed, the difference in grip between straight running and cornering tends to increase
Therefore, a vehicle fitted with such tires tends to become unstable when turning from a straight line to a turn

Method used

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  • Pneumatic tire
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Examples

Experimental program
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Effect test

Embodiment Construction

[0010] As is known in the art, a pneumatic tire comprises: a tread portion 2, the outer surface of which defines a ground contacting area; a pair of axially spaced apart bead portions, each with a bead core therein; a pair of sidewall portions extending between the tread edge (e) and the bead portion; a carcass extending between the bead portions through the tread and the sidewall portion; and a tread Part of the tread reinforcement belt is radially arranged on the outside of the carcass.

[0011] Incidentally, the tread edge (e) refers to the axially outermost edge of the ground contact area under a standard load condition in which a tire is mounted on a standard rim and inflated to a standard load and then loaded with a standard load . A standard rim refers to a rim for a tire certified by a standardization organization, ie, JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), STRO (Scandinavia), and the like. Standard pressure and standard tire load are the maxim...

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PUM

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Abstract

A pneumatic tire comprises a tread portion provided with blocks (5), the blocks are axially divided by at least one circumferential groove (3) and circumferentially divided by oblique grooves (4) inclined with respect to the tire axial direction towards one direction, and each of the shoulder-blocks (5c,5d) is subdivided into at least two parallelogrammic block elements (6) by at least one open sipe (7) extending across the block and inclined with respect to the tire axial direction towards the same direction as the oblique grooves (4), the parallelogrammic block elements (6) include two block-end elements (6t) located on the circumferential ends of the block, and each of the block-end elements (6t) is provided with at least one closed sipe (8) extending at an angle of less than 45 degrees with respect to the tire axial direction and terminating within the block to have closed ends.

Description

technical field [0001] This invention relates to pneumatic tires, and more particularly, to tread patterns for winter tires. Background technique [0002] In general, snow tires are provided with a block-type tread pattern, and the blocks are provided with a large number of sipes. If the number of channels in the tread portion is excessively increased, the amount of deformation or inclination of the block during running will increase due to the decrease in stiffness of the block. Therefore, the contact area with the ground and the grip power of the tires are reduced, with the result that the running stability is deteriorated, and non-uniform wear of the pads tends to occur. For snow tires, its cornering performance on ice and straight-line driving performance such as traction, braking distance, etc. are important parameters. As described above, if a large number of channels are formed, the difference in grip between straight running and cornering tends to increase. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/117B60C11/11B60C11/12
CPCB60C11/12B60C2011/1227Y10S152/03B60C11/11Y10S152/902B60C2011/1254
Inventor 小矢光晴
Owner SUMITOMO RUBBER IND LTD
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