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Pneumatic tire

A technology for pneumatic tires and tire width directions, which is applied to tire parts, tire edges, tire treads/tread patterns, etc., which can solve problems such as deterioration of tire rolling resistance, suppress changes in fuel economy performance, and reduce rolling resistance Effect

Pending Publication Date: 2022-06-24
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above configuration, there is a problem that the rolling r

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0133] Figure 4 It is a graph which shows the result of the performance test of the pneumatic tire which concerns on embodiment of this invention.

[0134] In this performance test, various test tires were evaluated for (1) rolling resistance, (2) wet performance, and (3) steering stability performance. In addition, test tires of tire size 195 / 65R15 were used.

[0135] (1) In the evaluation of rolling resistance, a drum tester with a drum diameter of 1707 [mm] was used, and an internal pressure of 180 [kPa] and 88 [%] of the maximum load capacity specified by JATMA were applied to the test tire. load, and the rolling resistance coefficient of the test tire was measured under the condition of a speed of 80 [km / h]. In addition, the rolling resistance at room temperature is a measured value at an ambient temperature of 25 [° C.], and the rolling resistance at a low temperature is a measured value at an ambient temperature of 10 [° C.]. This evaluation is performed by index ev...

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Abstract

In this pneumatic tire (1), the tan [delta] value (T20) at 20 [DEG C] and the tan [delta] value (T60) at 60 [DEG C] of a rubber member constituting at least one of a bead filler (12), a lower tread (152), a sidewall rubber (16), and a rim cushion rubber (17) satisfy the conditions 0.50 < = T20/T60 < = 2.00 and T20 < = 0.22. In addition, the tan [delta] value T20 of the rubber member at 20 [DEG C] is in the range of T20 < = 0.15. In addition, the tan delta value (T20sw) of the side wall rubber (16) at 20 [DEG C] and the tan delta value (T60sw) at 60 [DEG C] satisfy the conditions of 0.50 < = T20sw/T60sw < = 1.50 and T20sw < = 0.11.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire capable of suppressing fluctuations in the fuel economy performance of the tire due to changes in ambient temperature and reducing the rolling resistance of the tire when running in a low temperature environment. Background technique [0002] In conventional pneumatic tires, the tanδ value (loss tangent) of the tread rubber at 60 [°C] is set low by focusing on the fact that the tire temperature is about 60 [°C] when running in a normal temperature environment. to reduce the rolling resistance of the tires. At the same time, the wet performance of the tire is ensured by setting the tan δ value of the tread rubber (especially the cap rubber constituting the ground contact surface of the tire) high at 0 [° C.]. [0003] However, in the above-mentioned configuration, there is a problem that the rolling resistance of the tire deteriorates when running in a low tem...

Claims

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Application Information

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IPC IPC(8): B60C13/00B60C11/00B60C15/06
CPCB60C2011/0016B60C2011/0025B60C11/005B60C9/185B60C2011/0033B60C2013/007B60C2013/006B60C2015/061B60C15/0603B60C2015/0614B60C15/0054B60C2015/009Y02T10/86B60C13/00
Inventor 清水一宪畑宽
Owner YOKOHAMA RUBBER CO LTD