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Pneumatic tyre

A technology for pneumatic tires and tires, applied in pneumatic tires, tire parts, vehicle parts, etc., can solve the problems of sound-absorbing parts peeling, sound-absorbing parts failure, deformation follow-up, etc., to improve static stability, ensure sound-absorbing effect, realize The effect of rolling resistance

Active Publication Date: 2020-06-02
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the sound absorbing material fixed to the inner surface of the tire has low elongation characteristics, there is a problem that the sound absorbing material cannot follow the deformation of the tire at low temperature, and peeling and fracture of the sound absorbing material remarkably occur.
In addition, when the sound absorbing material fixed to the inner surface of the tire has high elongation characteristics, there is a problem that the sound absorbing material is deformed by compression set during high-speed driving, and a sufficient sound absorbing effect cannot be obtained.

Method used

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  • Pneumatic tyre
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] The tires of Comparative Examples 1 to 4 and Examples 1 to 4 were produced. The tire size of the pneumatic tire was 275 / 35ZR20, and it was provided with: a tread portion extending in the tire circumferential direction in an annular shape; On both sides of the tread portion; and a pair of bead portions, arranged on the inner side of the tire radial direction of these sidewall portions, and the sound absorbing members A to H having different physical properties are placed on the inner surface of the tread portion along the tire circumferential direction through the adhesive layer And paste. In addition, for the sound absorbing materials A to H attached to each test tire, the hardness of the sound absorbing materials was set as in Table 1 [N / 314cm 2 ], density of sound-absorbing parts [kg / m 3 ] and the number of units of sound-absorbing parts [pcs / 25mm].

[0050] In these test tires, the elongation at break [%] of each of the sound absorbing materials A to H was measured...

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Abstract

Provided is a pneumatic tyre in which a sound-absorbing material is effective in absorbing sound during high-speed travel and the sound-absorbing material can be prevented from separating or breakingin low temperatures. A pneumatic tyre provided with: a tread part (1) which extends in the circumferential direction of a tyre so as to form a ring shape; a pair of sidewall parts (2) arranged on therespective sides of the tread part (1); and a pair of bead parts (3) arranged on the inner sides, in the radial direction of the tyre, of the sidewall parts (2), wherein a sound-absorbing material (6)is fixed, via an adhesive layer (5), to the inner surface of the tread part (1), along the circumferential direction of the tyre, and when the temperature t of the sound-absorbing material (6) is atleast in the range -20 degrees to 80 degrees, the rupture elongation y [%] of the sound-absorbing material (6) satisfies the relationships y>=t+100 and y<=2t+440 with respect to the temperature t of the sound-absorbing material (6).

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of obtaining a sound-absorbing effect by a sound-absorbing material during high-speed running and preventing peeling and breaking of the sound-absorbing material at low temperatures. Background technique [0002] One of the causes of tire noise is cavity resonance sound caused by vibration of air filling the tire cavity. When the vehicle is running, the tread portion of the tire in contact with the road surface vibrates due to unevenness of the road surface, and the vibration vibrates the air in the tire cavity to generate the cavity resonance sound. In this cavity resonance sound, sound in a specific frequency band is also perceived as noise, and therefore, it is important to reduce the sound pressure level (noise level) in this frequency band in order to reduce the cavity resonance sound. [0003] As a method of reducing the noise generated by such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/00
CPCB60C19/002
Inventor 成濑雅公
Owner THE YOKOHAMA RUBBER CO LTD
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