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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, wheels, transportation and packaging, etc., can solve the problems of no effect, reduced sound absorption performance, occupying a considerable space, etc., to reduce road noise, increase wavelength difference, Noise reduction effect

Active Publication Date: 2010-12-01
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the technical guiding principle of this proposal is to use sound-absorbing materials to absorb the noise generated in the cavity, it will not be effective if sound-absorbing materials with sufficient capacity are not installed.
Therefore, the sound-absorbing material will occupy a considerable space inside the tire, which sometimes affects the assembly operation of the rim
Moreover, it also has the following problems: the sound-absorbing performance will gradually decline due to the deterioration of the sound-absorbing material during long-term use, so that the noise-proof effect will not be obtained.
[0005] Furthermore, because the porous sound-absorbing material is specially used to reduce air vibration, that is, cavity resonance sound, it has little effect on reducing road noise in the mid-frequency range caused by the above-mentioned tire vibration.
Therefore, these proposals have no reduction effect on vehicle interior noise in frequency bands other than cavity resonance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1～2、 comparative example 1～4

[0080] Prepare 2 kinds of pneumatic tires of the present invention (example 1, 2) and 4 kinds of pneumatic tires (comparative examples 1~4) other than the present invention and totally 6 kinds of tires, then install the rim on the 17x7J wheel, adopt the regular internal tire according to the JATMA standard The above-mentioned tires all have four circumferential main grooves that are not located on the center of the tire. The size of the tire is 215 / 55R17. vary.

[0081] In Examples and Comparative Examples, the ridges were formed of an elastic body (JIS hardness: 74, tan δ: 0.13, specific gravity: 1.10). In each example and comparative example, the raised ridge is according to Figure 4 The positions shown in (a) to (f) are arranged on the inner side of the carcass layer and on the outer side of the inner liner. The details are shown in Table 1.

[0082] In the evaluation, the reduction of cavity resonance and road noise, and the presence or absence and magnitude of each ef...

example 3～4、 comparative example 5～8

[0092]A total of 6 kinds of tires were prepared, and these tires all had 3 circumferential main grooves, one of which was located on the center of the tire, and the tire size was 215 / 55R17. The presence or absence of ridges in each tire is different, and even if there are ridges, their arrangement position and size are also different. These two types of pneumatic tires of the present invention (Examples 3 and 4) and tires other than the present invention were prepared. After 4 types of pneumatic tires (comparative examples 5-8) and 6 types of tires in total, the rims were installed on the 17x7J wheels, and inflated with normal internal pressure according to the JATMA standard.

[0093] In each example and comparative example, the ridge was formed of an elastic body (JIS hardness: 74, tan δ: 0.13, specific gravity: 0.10). In each example and comparative example, the raised ridge is according to Figure 5 The positions shown in (a) to (f) are arranged on the inner side of the c...

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Abstract

An object of the present invention is to provide a pneumatic tire capable of reducing noise from cavity resonance of near 200 to 250 Hz to road noise in the middle frequency range (315 Hz band) through the provision of a simple construction. The pneumatic tire including: a tread portion and a belt layer on an outer periphery of a carcass layer that extends between left and right bead portions and a plurality of circumferential main grooves extending in a tire circumferential direction provided on an outer surface of the tread portion, wherein on a tire cavity side surface of the tread portion, a ridge (Ra) protruding into the tire cavity side in a direction opposite to a tire radial direction is formed that extends in the tire circumferential direction in a position offset from a tire center towards a well side of a mounting rim so as to encompass an entire width of a well and an entire width of a circumferential main groove positioned farthest to a shoulder side.

Description

technical field [0001] The invention relates to a pneumatic tire, in particular to a pneumatic tire capable of reducing tire cavity resonance and road noise in the middle frequency range (315Hz frequency band). Background technique [0002] Pneumatic tires produce noise due to various reasons, among them, the cavity resonance sound near 200-250 Hz caused by the vibration of the air filled inside the tire, and the mid-frequency range (located in the The 315Hz frequency band at 1 / 3 octave) the transmission of road noise into the car will cause discomfort to the occupants. [0003] The cavity resonance sound in the low frequency range is an air column resonance sound generated when air vibration moves along the inner cavity of the toroidal tire in the form of an air column. As a method of reducing such cavity resonance, most of the existing proposals have proposed that a porous material such as polyurethane foam be added to the cavity formed between the tire and the rim of the...

Claims

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Application Information

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IPC IPC(8): B60C19/00
CPCB60C19/002Y10T152/10054Y10T152/10495
Inventor 丹野笃
Owner YOKOHAMA RUBBER CO LTD
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