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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, special tires, tire parts, etc., which can solve the problems of inability to obtain braking performance and reduction of rolling resistance, so as to reduce hysteresis loss and improve braking performance , The effect of improving braking performance

Pending Publication Date: 2020-09-25
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the structure in which the belt layer is flattened, although the rolling resistance can be reduced, the effect of both the improvement of the braking performance and the reduction of the rolling resistance cannot be obtained.

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] Tires of Conventional Example, Examples 1 to 12, and Comparative Examples 1 to 4 were produced. The tires had a tire size of 205 / 60R16 92V, and were provided with a tread portion, a pair of sidewall portions, and a pair of bead portions. A carcass layer is installed between the bead parts, and the carcass layer is rolled up from the inner side to the outer side of the tire around the bead core of each bead part. The tire is set as shown in Table 1: tread radius TR; contact width TCW Ratio to tire section width SW (TCW / SW×100%); ratio of bead filler height BFH to tire section height SH (BFH / SH×100%); height Hmax of tire maximum width position Pmax relative to tire section height SH (Hmax / SH×100%); the rubber thickness T at the tire maximum width position Pmax; the ratio of the rubber thickness Gc at the center of the tread portion to the tire section height SH (Gc / SH×100%); The ratio of the rubber thickness Gs of the shoulder to the tire section height SH (Gs / SH×100%); t...

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Abstract

Provided is a pneumatic tire that allows improvement of braking performance and reduction of rolling resistance. The pneumatic tire includes a tread portion 1, a pair of sidewall portions 2, and a pair of bead portions 3, wherein a carcass layer 4 is extended on and between the bead portions 3 and is turned up around bead cores 5 of the bead portions 3, respectively, from the tire inner side toward the tire outer side. In the pneumatic tire, the tread radius TR on the meridian cross-section at the tread portion 1 is 600-1700 mm, the ground-contact width TCW at the tread portion 1 is 60-90% ofthe tire cross-sectional width SW, and the height BFH of a bead filler 6 is not greater than 30% of the tire cross-sectional height SH.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of improving braking performance and reducing rolling resistance. Background technique [0002] In pneumatic tires, braking performance is generally improved by using a crown compound with high tan δ for the tread portion, but on the other hand, rolling resistance increases. Thus, braking performance and rolling resistance are in an antinomy relationship. [0003] Here, it has been proposed to reduce rolling resistance by suppressing shear deformation of tread rubber during running by flattening a belt layer embedded in a tread portion (see, for example, Patent Document 1). However, in the structure in which the belt layer is flattened, although the rolling resistance can be reduced, the effect of both the improvement of the braking performance and the reduction of the rolling resistance cannot be obtained. [0004] prior art literature [0005] pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00B60C13/00B60C15/04B60C15/06
CPCY02T10/86B60C3/04B60C2013/007B60C2015/061B60C2015/048B60C13/009B60C15/04B60C2009/0284
Inventor 加贺谷圭佑
Owner THE YOKOHAMA RUBBER CO LTD