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Pneumatic tire

A technology of pneumatic tires and tires, applied in special tires, tire parts, tire treads/tread patterns, etc., can solve the problems of radio noise, hindering the release of static electricity to the road, and high resistance

Inactive Publication Date: 2014-05-28
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a rubber member has a problem that it has a high electrical resistance compared to conventional products in which carbon black is mixed at a high ratio, and prevents the discharge of static electricity generated in the vehicle body or tires to the road surface, so that there is a problem that radio noise and the like are easily generated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0052]In order to specifically show the structure and effects of the present invention, the following evaluations were performed on the following examples.

[0053] (1) Conduction performance (resistance value)

[0054] A specified load was applied to the tire mounted on the rim, and a voltage (500 V) was applied from the shaft supporting the rim to the metal plate grounded on the tire to measure the resistance value.

[0055] (2) Rubber hardness

[0056] The rubber composition was vulcanized at 150° C. for 30 minutes, and the rubber hardness of the vulcanized rubber at 23° C. was measured in accordance with JIS K6253.

[0057] (3) Rolling resistance

[0058] Rolling resistance was measured and evaluated by a rolling resistance tester. The result of Comparative Example 1 was evaluated as 100, and the larger the numerical value, the better the rolling resistance.

[0059] (4) Uniformity

[0060] According to the test method stipulated in JISD4233, LFV (lateral force variat...

Embodiment 1

[0070] In the tire of Comparative Example 1, the conductive portion 52 was provided inside the both side wall portions of the crown portion 50 . The rubber hardness of the conductive portion 52 is set to be lower than the rubber hardness of the crown portion 50 . Other than that, it is the same as the tire of Comparative Example 1.

Embodiment 2

[0072] The conductive portion 52 is provided only on the vehicle body inner side end portion among the paired side end portions located on both sides in the tire width direction WD of the crown portion 50 . Other than that, it is the same as in Example 1.

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Abstract

An objective of the present invention is to provide a pneumatic tire whereby primarily rolling resistance is minimized and noise is minimized. This pneumatic tire tread rubber (5) comprises: a cap part (50) which is formed of non-conductive rubber and configures a grounding surface; a base part (51) which is disposed on the inner side of the cap part (50) in a tire radial direction (RD); and conductive parts (52) which are disposed in both of a pair of lateral end parts which are at ends of the cap (50) in a tire width direction, traverse the inner part of the cap (50) while avoiding a location which covers the grounding surface, and form shapes which connect the grounding surface with the bottom surface (50b) of the cap part (50) in the tire meridian cross-section. The conductive parts (52) are provided with extended sites (52b) which branch off outward to the tire width direction (WD) from conductive paths (52a) which connect the grounding surface with the bottom surface (50b) of the cap part (50). The conductive parts (52) are formed of a conductive rubber which has different rubber hardness from the non-conductive rubber which forms the cap part (50).

Description

technical field [0001] The present invention relates to a pneumatic tire capable of discharging static electricity generated on a vehicle body or tire to a road surface. Background technique [0002] In recent years, pneumatic tires have been proposed in which rubber members such as tread rubber are made of non-conductive rubber mixed with silica at a high ratio for the purpose of reducing rolling resistance closely related to fuel consumption performance. However, such a rubber member has a problem that it has a high electrical resistance compared to conventional products in which carbon black is mixed at a high ratio, and prevents static electricity generated in the vehicle body or tires from being discharged to the road surface, so that there is a problem that radio noise and the like are likely to be generated. [0003] Therefore, a pneumatic tire has been developed in which a tread rubber is formed of a non-conductive rubber and a conductive rubber mixed with carbon bla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C19/08B60C1/00B60C11/00
CPCB60C11/0058B60C19/082Y02T10/86B60C1/0016
Inventor 川上和纪
Owner TOYO TIRE & RUBBER CO LTD
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