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Pneumatic tire

A technology for pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire edges, etc., which can solve the problems of increased rolling resistance and deterioration of riding comfort, so as to reduce rolling resistance, improve riding comfort, The effect of suppressing fever

Active Publication Date: 2021-05-14
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a run-flat tire, when the volume of the rubber constituting the sidewall reinforcing layer is increased to suppress deflection during run-flat running, there is a problem that heat generation is promoted to increase rolling resistance, and due to tire Ride comfort during normal driving deteriorates due to increase in lateral rigidity

Method used

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  • Pneumatic tire
  • Pneumatic tire

Examples

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example

[0040] Pneumatic tires were produced in the conventional examples, comparative examples 1 to 3, and examples 1 to 9 in which the following parameters were set as shown in Table 1: M100, tan δ( 60°C) and JIS hardness (20°C); the presence or absence of the outer reinforcement layer; the M100 and JIS hardness (20°C) of the rubber constituting the outer reinforcement layer; the height H1 of the outer reinforcement layer relative to the height HW of the sidewall reinforcement layer Ratio (H1 / HW); the ratio of the height H2 of the bead filler to the height HW of the sidewall reinforcing layer (H2 / HW); the ratio of the width BW of the belt layer to the ground contact width W (BW / W×100% ); the overlapping amount L of the belt layer and the sidewall reinforcement layer; the cord angle of the belt layer; and the presence or absence of a full-coverage belt cover layer. The pneumatic tire has a tire size of 235 / 60RF18, and includes: a tread portion extending in the tire circumferential di...

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Abstract

Provided is a pneumatic tire that makes it possible to reduce rolling resistance while also improving run-flat durability, and to improve ride quality during ordinary travel. A bead filler 6 is arranged on the outer peripheral sides of respective bead cores 5 in a bead section 3. A side reinforcing layer 11 having a crescent-shaped cross-section is arranged on the tire width direction inside of a carcass layer 4 in a side wall section 2. In terms of the physical properties of rubber constituting the side reinforcing layer 11 and rubber constituting the bead filler 6, the modulus at 100% elongation is in the range of 8.4 to 10.2 MPa, tandelta at 60 DEG C is in the range of 0.04 to 0.08, and JIS hardness at 20 DEG C is in the range of 75 to 79.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of reducing rolling resistance while improving run-flat durability, and improving ride comfort during normal driving. Background technique [0002] As a pneumatic tire capable of running in a flat state, a sidewall-reinforced run-flat tire has been proposed in which a run-flat reinforcing layer having a crescent-shaped cross-section is arranged on the inner surface side of the sidewall portion (for example, refer to Patent Document 1, 2). In such a run-flat tire, when the volume of the rubber constituting the sidewall reinforcing layer is increased to suppress deflection during run-flat running, there is a problem that heat generation is promoted to increase rolling resistance, and due to tire Riding comfort during normal driving deteriorates due to an increase in lateral rigidity. [0003] prior art literature [0004] patent documents [0005] Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/00B60C9/18B60C15/06
CPCB60C9/2009B60C2009/2016B60C2009/2038B60C9/28B60C17/0009B60C2017/0063B60C2017/0072B60C2015/061B60C15/0603B60C2015/0621B60C15/0036B60C2009/2019B60C2017/0054
Inventor 竹森谅平
Owner THE YOKOHAMA RUBBER CO LTD
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