Pneumatic tire with sipes

A technology for pneumatic tires and tires, which is applied to pneumatic tires, tire parts, tire treads/tread patterns, etc., can solve the problems of reducing the handling stability of dry road surfaces and reducing the rigidity of pattern blocks, so as to improve the rigidity and improve the performance on snow. performance effect

Active Publication Date: 2010-06-30
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, increasing such a groove volume or the number of sipe formations causes a reduction in block rigidity, thereby reducing handling stability on dry roads (sometimes referred to as dry road handling stability), etc., snow performance and dry road handling stability. Sex is an exclusive relationship, so there is a problem of being able to reconcile both at a high level

Method used

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  • Pneumatic tire with sipes
  • Pneumatic tire with sipes
  • Pneumatic tire with sipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0053] Prototype has figure 1 The basic pattern, and based on the specifications in Table 1, the tire size 205 / 55R16 non-studded tires for passenger cars, and the dry road handling stability and snow performance were tested, and the results are recorded in Table 1. Except for the swing width of the sipe and the pitch of the teeth, each tire has substantially the same specification.

[0054] (1) Dry road handling stability:

[0055] Using a vehicle with test tires mounted on all wheels under the following conditions, the steering stability (stability when changing lanes and cornering) when driving on a tire test course on a dry asphalt road was compared with a comparative example by the driver's senses. An index of 1 out of 100 was evaluated. The larger the index, the better.

[0056] Rim size: 16×6.5J

[0057] Internal pressure: 200kPa

[0058] Vehicle: Sedan (2000cc FR car)

[0059] (2) Snow performance:

[0060] Using the above-mentioned test vehicle, the steering st...

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Abstract

A pneumatic tire whose steering stability on dry roads is improved with minimizing lowering of on-snow performances and which has round shoulders and comprises tread portion (2) divided by circumferential main grooves (3) and lateral grooves (4) into blocks (5) provided with sipes (6) each having zigzag part (8), the circumferential grooves (3) including at least a pair of axially outermost circumferential grooves (3o) to divide the tread portion (2) into shoulder regions (Ysh) and crown region (Ycr), wherein the zigzag part (8) of sipes (6sh) disposed in the shoulder regions (Ysh) has a larger zigzag amplitude (Wsh) and a larger zigzag pitch (Psh) than zigzag amplitude (Wcr) and zigzag pitch (Pcr) of the zigzag part (8) of sipes (6cr) disposed in the crown region (Ycr), and angle ( sh) of the sipes (6sh) with respect to the axial direction is smaller than angle ( cr) of the sipes (6cr) with respect to the axial direction.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for a studless tire, capable of suppressing a decrease in on-snow performance to a minimum and improving steering stability on a dry road surface. Background technique [0002] In pneumatic tires such as stud tires suitable for driving on icy and snowy roads, the tread portion is usually divided into a plurality of blocks by longitudinal main grooves extending in the tire circumferential direction and transverse grooves in the direction intersecting with them, and formed on each block. Multiple zigzag sipes. Then, the on-snow performance can be ensured by the shearing force of snow pillars or the like formed in the grooves, the corner effect of the blocks and the sipes, and the like. [0003] In addition, in order to improve the above-mentioned on-snow performance, it is known that it is preferable to increase the snow column shear force by increasing the groove volume and to increase the edge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/00B60C11/117B60C11/01
CPCB60C11/0304B60C2011/1227B60C2011/1213B60C11/12B60C11/1236B60C2011/1286
Inventor 景山尚纪
Owner SUMITOMO RUBBER IND LTD
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