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Pneumatic tire

A technology for pneumatic tires, tires, applied in tire parts, tire sidewalls, transportation and packaging, etc., can solve problems such as air accumulation

Active Publication Date: 2015-04-15
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above vent hole can solve the problem of air accumulation in the tire mold, however, part of the molten rubber of the unvulcanized tire flows into this vent hole after the gas is exhausted

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] The above-described pneumatic tire having the sidewall portion 10 was manufactured, and its effect was investigated. The size of the produced pneumatic tire is 185 / 65R15. In order to evaluate the produced pneumatic tires, 4 manufactured pneumatic tires were mounted on a 1500CC displacement, motor-assisted passenger car (front-wheel drive), and the fuel efficiency was evaluated. Also, the manufactured pneumatic tires were evaluated for appearance damage due to air accumulation.

[0047] For the evaluation of fuel efficiency, the evaluation of fuel consumption (liter / km) is calculated under the condition that a passenger car runs 500 laps on a 2km circular runway at a speed of 100km / h. Fuel efficiency is represented by an index, and the fuel efficiency index of the conventional pneumatic tire is set to 100. When the index becomes larger, fuel efficiency is improved. Meanwhile, in order to evaluate the appearance damage, it is calculated that in 100 Figure 5 Among the...

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PUM

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Abstract

A pneumatic tire has no spew or no spew trace on a sidewall surface of the pneumatic tire and reduces air resistance. The tire includes a plurality of dimple-like recesses and a plurality of linear valley portions. The dimple-like recesses (16) are provided in a first region (R1) including a tire maximum width position of the sidewall surface of the tire. The linear valley portions which are formed by serration of the sidewall surface, extend linearly in one direction in the first region (R1) and provided around each of the recesses (16) so as to enclose each of the recesses. When a size of an occupied area of each of the recesses on the sidewall surface is represented by an equivalent diameter of a circle, an interval distance between the linear valley portions is smaller than the equivalent diameter.

Description

technical field [0001] The invention relates to a pneumatic tire, in particular to a design of the sidewall surface of the pneumatic tire. Background technique [0002] Recently, in order to improve the fuel efficiency of vehicles equipped with pneumatic tires and to increase the maximum speed of the vehicles, the rolling resistance requirements of pneumatic tires have been lowered. In order to reduce the rolling resistance of the pneumatic tire, various embodiments have been proposed in which the structure, tread pattern, etc. of the pneumatic tire are adjusted. In addition, in order to improve the fuel efficiency of the vehicle and increase the maximum speed of the vehicle, some measures have been proposed to reduce the air resistance of the rolling pneumatic tire. The air resistance of a pneumatic tire is affected by the unevenness of the tread pattern on the tread portion and the unevenness of the pattern and markings on the surface of the sidewall portion. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C13/00
CPCB60C13/001
Inventor 海老子正洋
Owner THE YOKOHAMA RUBBER CO LTD
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