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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of reducing driving performance, etc. Effect

Inactive Publication Date: 2012-11-28
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that grinding b (indicated by oblique lines) occurs on the outer side of the shoulder block a arranged on the outermost side in the tire axial direction, and the running performance is significantly reduced.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] Based on the specifications in Table 1, test-produce pneumatic tires for rally races with a tire size of 205 / 65R15, and its composition figure 1 constructed as shown and has figure 2 The tread pattern shown was shown, and the traction performance, cornering performance, grip feeling and uneven wear resistance performance of each test tire were tested. Each tire has substantially the same specification except for the protruding portion.

[0043] (1) Traction performance, cornering performance, grip feeling:

[0044] The test tires were installed on all tires of a four-wheel drive vehicle for rally competition with a rim (7J×15), an internal pressure (210kPa), and a displacement of 2000cc. km) for five laps, and by testing the driver's senses, the traction performance, cornering performance, and grip were evaluated using the 10-point method of Comparative Example 1 as 5 points. The higher the value, the better.

[0045] (2) Anti-wear performance:

[0046] Using the...

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Abstract

The present invention provides a pneumatic tire capable of keeping a high running performance on road surface and improving running performance of ruts. The tread and shoulder zone (Ys) of a tire forms tire shoulder pattern block arrays arranged for separating the tire shoulder riffled blocks along the circumference of the tire by utilizing the outer transversal furrows. On the meridian sectionalplane containing the tire axis, the tire shoulder riffled blocks have projecting parts which have a projecting upside wall surface and a projecting lower side wall surface, wherein, the projecting upside wall surface facing to the radial inner side of the tire by an angle (alpha ) from 35 DEG to 45DEG relative to the tire from the earth terminal of the tread and obliquely extending to the axial external side of the tire, and the projecting lower side wall surface facing from the projecting peak as the tire axial outer end point of the projecting upside wall to the radial inner side of the tire and obliquely extending to the axial external side of the tire and being connected with the external surface of the lateral part of tire. The outer transversal furrows having openings on the projecting lower side wall surface.

Description

technical field [0001] The present invention relates to a tire suitable for use in races such as rally races and dirt trials, and more particularly, to a pneumatic tire that improves maneuverability when driving in ruts. Background technique [0002] In tires running on uneven roads, especially in pneumatic tires used in competitions such as rally or track off-road races, block patterns are widely used in order to improve traction on uneven roads, that is: the tread portion is along the The circumferential grooves extending in the tire circumferential direction and the lateral grooves intersecting them are divided into a plurality of blocks. [0003] On the other hand, the performance of such tires on hard flat roads (sometimes referred to as high-quality road performance) is also very important, so the tread profile is basically the same as that of ordinary car tires, such as Figure 6 As shown, the tread contact width Tw1 is set to about 80 to 86% of the tire cross-section...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/01B60C11/11
Inventor 山根正胜
Owner SUMITOMO RUBBER IND LTD
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