Pneumatic tire

A technology of pneumatic tires and treads, applied in special tires, tire parts, tire treads/tread patterns, etc., can solve the problems of reduced charge suppression performance and reduced discharge performance of tires, and achieve separation suppression and on-ice performance. Increased and uniform effect of ground pressure difference

Active Publication Date: 2019-04-16
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the discharge performance from the tire to the road surface is reduced, and the electrification suppression performance of the tire is reduced.

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0154] Figure 10 It is a graph showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention. Figure 11 It is an explanatory diagram showing a test tire of a conventional example.

[0155] In this performance test, evaluations related to (1) braking performance on ice, (2) electrification suppression performance (resistance value), and (3) separation resistance performance were performed on a plurality of different pneumatic tires (see Figure 10 ). In this performance test, a pneumatic tire having a tire size of 195 / 65R15 91Q was assembled to a rim having a rim size of 15×6J, and an air pressure of 210 [kPa] and a load prescribed by JATMA were applied to the pneumatic tire. In addition, the pneumatic tire was attached to a four-wheel-drive passenger car with a displacement of 3.0 [L] as a test vehicle.

[0156] (1) In the evaluation related to braking performance on ice, a test vehicle was run on a predetermined ic...

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PUM

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Abstract

Provided is a pneumatic tire in which the modulus of a cap tread 151 when stretched to 300% is in the range of 3.0-7.0 (Mpa), the modulus of an under tread 152 when stretched to 300% is in the range of 10.0-20.0 (Mpa), and the modulus of a grounding tread 7 when stretched to 300% is in the range of 10.0-20.0 (Mpa). The grounding tread 7 comprises a rubber material having a volume resistivity of 1*10^7 (omega*cm) or less. The under tread 152 is provided with a thickened section 1521 in an area between the grounding tread 7 and an edge section of a block 5. As a result of the thickened section 1521, the gauge Ga of the under tread 152 gradually increases from the grounding tread 7 toward the edge section of the block 5.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of improving the separation resistance performance of the tire while maintaining the performance on ice of the tire. Background technique [0002] In studless tires, not only the ice performance and snow performance of the tire but also the wet performance and rolling resistance are required to be improved. Therefore, in recent years, a tread structure in which the silica content in the rubber compound of the crown tread is increased has been adopted. [0003] On the other hand, silica has high insulating properties, so when the silica content of the crown tread increases, the resistance value of the crown tread increases. As a result, the discharge performance from the tire to the road surface decreases, and the electrification suppression performance of the tire decreases. Therefore, in recent studless tires, an electrification suppression structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C19/08B60C1/00B60C11/00B60C11/12
CPCB60C1/0016B60C2011/0025B60C11/1259B60C11/0306B60C11/005B60C19/082B60C1/00B60C11/00B60C11/12B60C19/08
Inventor 岸添勇
Owner THE YOKOHAMA RUBBER CO LTD
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