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Pneumatic tire

A technology for pneumatic tires and treads, applied in tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve the problems of reduced high-speed durability, reduced handling stability, uneven wear, etc. Grip, effect of suppressing uneven temperature

Inactive Publication Date: 2013-05-29
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when increasing the pattern constituting unit, it is necessary to increase the rigidity and the amount of rubber of the land portion forming the pattern constituting unit
As a result, at the initial stage of driving, the temperature rise of the land portion is slow, which makes it difficult for the tire to warm up and reduces the traction performance.
In addition, after the temperature rises, the temperature in the land portion becomes uneven, causing a decrease in steering stability and uneven wear, and there are problems such as excessive temperature rise due to heat accumulated in the land portion, which reduces high-speed durability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] Manufactured based on the specifications in Table 1 to figure 1 The tread pattern shown is a pneumatic tire with a tire size of 235 / 45R17 with the basic pattern, and the passing time, handling stability, appearance wear and high-speed durability of each test tire on the car obstacle course were tested and compared respectively. Compare. Here, the specifications are the same except for the specifications listed in Table 1.

[0059] (1) Passing time:

[0060] Install the test tires on all the wheels of a car (2000cc) under the conditions of rim (8JJ×17) and internal pressure (200kPa), drive on the car obstacle course recognized by JAF, and perform 7 timing challenges to measure the passing time at that time and compared.

[0061] (2) Handling stability:

[0062] The steering stability in the above-mentioned timing challenge was evaluated by the driver's senses with an index of 100 in Comparative Example 1. The higher the value, the better.

[0063] (3) Appearance we...

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PUM

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Abstract

A pneumatic tire (1) comprises a tread portion provided with a plurality of tread grooves (3) defining a tread pattern; the tread pattern is formed by arranging a pattern unit (4) repeatedly in the tire circumferential direction; the number of the repeatedly-arranged pattern units (4) around the tire is 10 to 20; the pattern unit comprises a plurality of blind holes (12) opened at the tread surface; and the number of the blind holes (12) per pattern unit is 2 to 18.

Description

technical field [0001] The present invention relates to a tire with improved grip at the initial stage of running and improved high-speed durability, and in particular, a pneumatic tire suitable for competitions such as auto obstacle races. Background technique [0002] In addition to driving on roads, for example, in tires for high-speed driving that are also based on competitive driving such as auto obstacle races, in order to improve steering stability, relatively large pattern constituent units that constitute the tread pattern are widely used to improve the pattern structure. The rigidity of the unit. [0003] However, when increasing the pattern constituting unit, it is necessary to increase the rigidity and the amount of rubber of the land portion forming the pattern constituting unit. As a result, the temperature rise of the land portion is slow at the initial stage of running, which makes it difficult for the tire to warm up and reduces the traction performance. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/00B60C11/03
CPCB60C11/0302B60C11/032B60C11/0318
Inventor 竹内二郎
Owner SUMITOMO RUBBER IND LTD
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