KR102288443B1 - Sound absorber for tires with Helmholtz resonators - Google Patents

Abstract

The present invention relates to a sound absorbing material for a tire to which a Helmholtz resonator is applied. The disclosed sound absorbing material for the tire to which the Helmholtz resonator is applied may comprise: a plurality of bodies coupled to opposite surfaces of a tire tread; a first resonance chamber formed inside the bodies; a first passage connecting the first resonance chamber to the outside of the bodies; a plurality of second resonance chambers formed on inner sidewalls of the bodies; and a plurality of second passages connecting the first resonance chamber to the second resonance chamber. Accordingly, it is possible to reduce road noise through effective absorption of a cavity resonance sound inside the tire. An objective of the present invention is to provide the sound absorbing material for the tire to which the Helmholtz resonator is applied, which can be attached to the inside of the tire.

Description

Sound absorber for tires with Helmholtz resonators

The present invention relates to a sound absorbing material for a tire to which a Helmholtz resonator is applied, and more particularly, to a sound absorbing material for a tire capable of reducing noise generated from a tire.

In general, pneumatic tires have a support function that supports the entire load of the vehicle, a power transmission function that transmits the driving force and braking force of the vehicle to the road surface, a shock mitigation function that alleviates external shocks caused by irregular road surfaces, and the progress of the vehicle. It is equipped with various position change functions, etc. to change the position according to the direction.

A typical structure of such a pneumatic tire includes a tread, which is a thick rubber layer in direct contact with the road surface; Shoulder (Shoulder) constituting the shoulder of the tire with the thickest thickness; A side wall on the side of the tire that improves the riding comfort through flexible flexing and extending motion and displays the type, size, manufacturer, etc. of the tire; A bead that surrounds the end of the cord paper so that the tire is mounted on the rim (Bead); Carcass made of tire cord paper, that is, a body ply as a part that forms the skeleton of the tire and withstands the internal air pressure and load or impact, and a layer inserted into the tread and the body ply. a belt layer that relieves the impact of the tread and prevents cracks or trauma of the tread from reaching the body ply directly; A rubber layer provided inside the body ply is made of an inner liner to prevent air leakage.

And the pneumatic tire is provided with a rim (Rim) is mounted to surround the outer surface of the bead portion.

Here, when the rim is mounted on the bead, a cavity is formed inside the tire, and when the cavity is filled with compressed air, the tire absorbs an impact from the ground and supports the vehicle body.

However, since a cavity is formed inside the tire, a space is provided for sound waves to resonate while driving a vehicle to generate cavity resonance due to vibration of air, and the cavity resonance is transmitted to the outside and inside of the vehicle. As a result, it not only causes dissatisfaction with the noise to drivers or passengers, but also causes noise pollution in the external environment.

In particular, road noise of a pneumatic tire is a sound wave in the range of 50 to 400 Hz generated from a tire traveling on a road, and the main cause of the road noise is resonance vibration of air generated in the tire cavity.

The cavity resonance sound is generated when the tire tread vibrates due to the unevenness of the road surface, and the vibration vibrates the air inside the tire. The frequency of the cavity resonance sound is known to be around 200 to 250 Hz, and it is important to reduce the noise level in the frequency band to reduce tire noise.

As a method of reducing noise caused by the cavity resonance sound phenomenon, a method of absorbing vibration and noise by attaching a sound absorbing material to the inside of a tire has been recently proposed. It is common to attach a sound absorbing material to the bottom surface of the tire tread, and there are cases in which the mounting position of the sound absorbing material is changed in consideration of the sidewall's flexing/extending motion.

Here, since the geometric shape of the sound-absorbing damper in addition to the material properties of the sound-absorbing damper has a great influence on effective absorption of the cavity resonance sound, the need for the development of an improved sound-absorbing material shape to further improve the sound-absorbing performance has emerged.

Korean Patent Application Laid-Open No. 10-2010-0005511 'A low-noise pneumatic tire with a sound-absorbing damper' has a wedge-shaped sound-absorbing channel made of a plurality of sound-absorbing materials, and the wedge-shaped sound-absorbing channels are connected to each other by crossing them at an angle of 90 degrees. Disclosed is a pneumatic tire characterized in that it has a structure.

An object of the present invention is to provide a sound absorbing material for a tire to which a Helmholtz resonator that can be attached to the inside of a tire is applied.

The object includes a plurality of bodies coupled to opposite surfaces of the tire tread; a first resonance chamber formed inside the body; a first passage connecting the first resonance chamber and the outside of the body; a plurality of second resonance chambers formed on the inner sidewalls of the body; And it can be achieved by a sound absorbing material for tires to which the Helmholtz resonator is applied, which may include a plurality of second passages connecting the first resonance chamber and the second resonance chamber.

In addition, the above object, the first resonance chamber can be achieved by a sound-absorbing material for a tire to which a Helmholtz resonator is applied, which can be coated with a sound-absorbing layer on the surface.

In addition, the above object, the first resonance chamber can be achieved by a sound-absorbing material for a tire to which one or more irregularities can be formed on the surface of the Helmholtz resonator applied.

In addition, the above object, the first passage can be achieved by a sound absorbing material for a tire to which a Helmholtz resonator that can be formed to face a pair on the sidewall of the body is applied.

In addition, the above object can be achieved by a sound absorbing material for a tire to which the body is applied with a Helmholtz resonator that can be arranged at equal intervals inside the tire.

In addition, the above object may be achieved by a sound absorbing material for a tire to which a Helmholtz resonator is applied, in which the plurality of bodies have different shapes of the first resonance chamber but the same mass.

In addition, the above object can be achieved by a sound absorbing material for a tire to which a Helmholtz resonator is applied, in which the plurality of second resonance chambers can be formed to have different volumes.

In addition, the above object may be achieved by a sound absorbing material for a tire to which a Helmholtz resonator is applied, in which the plurality of second resonance chambers may be formed to have different shapes.

In addition, the above object can be achieved by a sound absorbing material for a tire to which a Helmholtz resonator is applied, in which a resonance groove is formed on the lower surface of the body, and a connection groove connecting the resonance groove and the outside of the body can be formed.

In addition, the above object can be achieved by a sound absorbing material for a tire to which the body is a Helmholtz resonator in which a third passage connecting the first resonance chamber and the resonance groove can be formed.

According to the sound absorbing material for a tire to which the Helmholtz resonator is applied according to the present invention, a plurality of bodies coupled to the opposite surface of the tire tread; a first resonance chamber formed inside the body; a first passage connecting the first resonance chamber and the outside of the body; a plurality of second resonance chambers formed on the inner sidewalls of the body; and a plurality of second passages connecting the first resonance chamber and the second resonance chamber, so that road noise can be reduced through effective absorption of the cavity resonance sound inside the tire.

In addition, according to the sound absorbing material for a tire to which the Helmholtz resonator according to the present invention is applied, since the sound absorbing layer may be coated on the surface of the first resonance chamber, it is possible to more effectively absorb the internal cavity resonance sound of the tire.

In addition, according to the sound absorbing material for tires to which the Helmholtz resonator according to the present invention is applied, since one or more irregularities may be formed on the surface of the first resonance chamber, it is possible to divide and disperse the noise wave.

In addition, according to the sound absorbing material for tires to which the Helmholtz resonator according to the present invention is applied, since the first passage may be formed to face a pair on the sidewall of the body, it is possible to secure more routes leading to the first resonance chamber.

In addition, according to the sound absorbing material for a tire to which the Helmholtz resonator according to the present invention is applied, the body can be disposed at the same interval inside the tire, so that noise and vibration caused by eccentricity can be prevented.

In addition, according to the sound-absorbing material for a tire to which the Helmholtz resonator according to the present invention is applied, the plurality of bodies may have the same mass although the shapes of the first resonance chambers are different from each other, so that each of the first resonance chambers absorbs noise waves of different frequencies. can do.

In addition, according to the sound absorbing material for tires to which the Helmholtz resonator according to the present invention is applied, since the plurality of second resonance chambers can be formed to have different volumes, each of the second resonance chambers can absorb noise waves of different frequencies. .

In addition, according to the sound absorbing material for tires to which the Helmholtz resonator according to the present invention is applied, since the plurality of second resonance chambers can be formed to have different shapes, each second resonance chamber can absorb noise waves of different frequencies. .

In addition, according to the sound absorbing material for tires to which the Helmholtz resonator according to the present invention is applied, a resonance groove is formed on the lower surface of the body, and a connection groove connecting the resonance groove and the outside of the body can be formed in the body, so the resonance groove and the inner surface of the tire It can absorb noise in a separate space it forms.

In addition, according to the sound absorbing material for tires to which the Helmholtz resonator according to the present invention is applied, the body may have a third passage connecting the first resonance chamber and the resonance groove, so that a separate space formed by the resonance groove and the inner surface of the tire is formed in the first It is connected to the resonance chamber and can absorb noise.

1 is a perspective view of a sound absorbing material for a tire to which a Helmholtz resonator according to Example 1 of the present invention is applied.
FIG. 2 is a perspective view illustrating a cross-section taken along line AA′ in FIG. 1 .
3 is a perspective view of a sound absorbing material for a tire to which a Helmholtz resonator according to Example 2 of the present invention is applied.
FIG. 4 is a perspective view illustrating a cross-section taken along line BB′ in FIG. 3 .
5 is a perspective view illustrating a rear surface of a sound absorbing material for a tire to which a Helmholtz resonator according to Example 2 of the present invention is applied.
6 is a perspective view showing a tire sound absorbing material to which a Helmholtz resonator according to the present invention is applied is attached to the inside of the tire.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention.

The X, Y, and Z axes shown in the drawings are arbitrarily set for convenience of explanation, not for the purpose of limiting rights. , and the Z axis is defined as indicating the up and down directions.

Each direction described below is based thereon, except where otherwise specifically limited.

Top (top), bottom (bottom), left and right (side or lateral), front (front, front), back (back, back), etc., which refer to directions in the description and claims of the invention, are not intended to limit the right. For the convenience of description, the relative positions between the drawings and the components are determined as a reference, and each direction described below is based on this, except when otherwise specifically limited.

First, the Helmholtz resonance principle applied to the present invention will be briefly described.

In general, a Helmholtz resonator consists of a relatively small opening and a hermetic cavity, and the mass of air in the neck and the volume elasticity of the cavity form a single resonant mechanism.

That is, in the Helmholtz resonator, the air in the neck acts as a mass and the air inside acts as a spring to cause resonance, and by changing the structure of the resonator, the resonance frequency can be changed.

The Helmholtz resonance frequency is expressed in Equation 1 below.

f: Helmholtz resonance frequency

C: the speed of sound in the fluid

S: cross-sectional area of fluid inlet

L: length of fluid inlet

V: volume of resonant space

1, 2 and 6, the sound absorbing material for a tire to which the Helmholtz resonator according to the first embodiment of the present invention is applied includes a plurality of bodies 110 coupled to surfaces opposite to the tread 11 of the tire 10; a first resonance chamber 120 formed inside the body 110; a first passage 130 connecting the first resonance chamber 120 and the outside of the body 110; a plurality of second resonance chambers 140 formed on the inner sidewalls of the body 110; and a plurality of second passages 150 connecting the first resonance chamber 120 and the second resonance chamber 140 .

1 to 2 , the body 110 is a portion in which a first resonance chamber 120 , a first passage 130 , a second resonance chamber 140 , and a second passage 150 are formed. .

The body 110 is coupled to the inner surface of the tire 10 opposite to the tread 11 of the tire 10 .

The body 110 may be a dome or polyhedral block in which a central portion of a cross-sectional area in the circumferential direction protrudes.

The body 110 may be made of a synthetic resin such as polypropylene or polyurethane, and may be attached to the inner liner 15 inside the tire 10 using an adhesive means such as an adhesive or double-sided tape.

The body 110 may be made of a porous material (porous foam).

In the porous material, minute holes formed in the material may be a passage through which noise is introduced.

Referring to FIG. 6 , since the body 110 is separated into a plurality of parts, it is possible to reduce weight compared to a circular ring shape.

The body 110 is provided in plurality, and each body 110 is arranged at equal intervals in the circumferential direction to prevent vibration and noise from being generated when the tire 10 rotates.

The body 110 is provided in plurality, and each body 110 is formed with the same mass to prevent vibration and noise from being generated when the tire 10 rotates.

The body 110 is provided in plurality, and each body 110 has the same volume and mass and is arranged at equal intervals in the circumferential direction to prevent vibration and noise from being generated when the tire 10 rotates.

Referring to FIG. 2 , the first resonance chamber 120 is a space in which noise introduced from the outside of the body 110 is reduced.

The first resonance chamber 120 may reduce noise introduced through the first passage 130 by using the Helmholtz resonance principle.

The plurality of bodies 110 have different volumes of the first resonance chambers 120 formed in each body 110 so that the frequencies of noise that can be reduced by each of the first resonance chambers 120 are different. can be adjusted

The first resonance chamber 120 may be coated with a sound-absorbing layer on the surface.

The sound absorbing layer may absorb noise introduced into the first resonance chamber 120 .

The sound-absorbing layer can be selected differently according to the frequency of the noise to be absorbed.

A plurality of irregularities may be formed on a surface of the first resonance chamber 120 .

The irregularities may divide and disperse the noise wave.

The size and number of the irregularities may be formed differently according to the frequency of noise desired to be absorbed.

1 and 2 , the first passage 130 is a path through which noise from the outside of the body 110 can be introduced into the first resonance chamber 120 .

The first passage 130 may be formed on the upper surface or the side surface of the body 110 .

The cross-sectional area and length of the first passage 130 may be changed according to the frequency of noise desired to be reduced.

The first passage 130 may have an outer cross-sectional area larger than an inner cross-sectional area to increase an inlet through which noise is introduced.

The first passage 130 may substantially expand the volume of the resonance space by forming an outer cross-sectional area smaller than an inner cross-sectional area.

The first passage 130 may be formed in a pair on the sidewall of the body 110 to face each other to secure more paths through which noise is introduced.

The first passage 130 may be coated with a sound-absorbing layer coated on the first resonance chamber (120).

Referring to FIG. 2 , the second resonance chamber 140 is a space in which noise introduced from the first resonance chamber 120 is reduced.

The second resonance chamber 140 may reduce noise introduced through the second passage 150 by using the Helmholtz resonance principle.

The body 110 may differently adjust the frequency of noise that can be reduced by forming the position or volume of the second resonance chamber 140 differently.

The second resonance chamber 140 may be formed anywhere on the surface of the first resonance chamber 120 .

The plurality of second resonance chambers 140 may be connected to each other.

The second resonance chamber 140 may be coated with a sound-absorbing layer on the surface.

The sound absorbing layer may absorb the noise introduced into the second resonance chamber 140 .

The sound-absorbing layer can be selected differently according to the frequency of the noise to be absorbed.

A plurality of irregularities may be formed on the surface of the second resonance chamber 140 .

The irregularities may divide and disperse the noise wave.

The size and number of the irregularities may be formed differently according to the frequency of noise desired to be absorbed.

Referring to FIG. 2 , the second passage 150 is a path through which the noise of the first resonance chamber 120 can be introduced into the second resonance chamber 140 .

The cross-sectional area and length of the second passage 150 may be changed according to the frequency of noise desired to be reduced.

The second passage 150 may have an outer cross-sectional area larger than an inner cross-sectional area to increase an inlet through which noise is introduced.

The second passage 150 may substantially expand the volume of the resonance space by forming an outer cross-sectional area smaller than an inner cross-sectional area.

The second passage 150 may be coated with a sound-absorbing layer coated on the second resonance chamber 140 .

Since the sound absorbing material for a tire to which the Helmholtz resonator is applied according to the second embodiment of the present invention has the same basic structure as that of the first embodiment, the difference from the first embodiment will be mainly described below.

3 to 5, in the sound absorbing material for tires to which the Helmholtz resonator according to the second embodiment of the present invention is applied, the body 110 has a resonance groove 170 formed on its lower surface, and the body 110 has a resonance groove ( A connection groove 180 connecting the 170 and the outside of the body 110 is formed.

4 to 5 , the resonance groove 170 may form a third resonance chamber together with the inner surface of the tire 10 when the body 110 is attached to the tire 10 .

The third resonance chamber is a space in which noise introduced from the outside of the body 110 is reduced.

The third resonance chamber may reduce noise introduced through the connection groove 180 by using the Helmholtz resonance principle.

The plurality of bodies 110 may have different volumes of the third resonance chamber formed in each body 110 , so that the frequency of noise that each third resonance chamber can reduce can be adjusted differently.

The frequencies of noise that can be reduced in the first resonance chamber 120 , the second resonance chamber 140 , and the third resonance chamber can be adjusted to be different from each other.

The resonance groove 170 may be coated with a sound-absorbing layer on the surface.

The sound-absorbing layer may absorb the noise introduced into the third resonance chamber.

The sound-absorbing layer can be selected differently according to the frequency of the noise to be absorbed.

A plurality of irregularities may be formed on a surface of the third resonance chamber.

The irregularities may divide and disperse the noise wave.

The size and number of the irregularities may be formed differently according to the frequency of noise desired to be absorbed.

Referring to FIG. 5 , the connection groove 180 is a path through which noise from the outside of the body 110 can be introduced into the third resonance chamber.

The connection groove 180 may be formed on a side surface of the body 110 .

The connection groove 180 may change the cross-sectional area and length according to the frequency of noise desired to be reduced.

The connection groove 180 may have an outer cross-sectional area larger than an inner cross-sectional area to increase an inlet through which noise is introduced.

The connection groove 180 can substantially expand the volume of the resonance space by forming an outer cross-sectional area smaller than an inner cross-sectional area.

The connection groove 180 may be formed in a pair on the sidewall of the body 110 to face each other to secure more paths through which noise is introduced.

The connection groove 180 may be coated with a sound-absorbing layer coated on the resonance groove 170 .

4 to 5 , in the body 110 , a third passage 190 connecting the first resonance chamber 120 and the resonance groove 170 may be formed.

The third passage 190 is a path through which the noise of the first resonance chamber 120 and the third resonance chamber can be introduced to each other.

The third passage 190 may allow the first resonance chamber 120 and the third resonance chamber to act as a mutual resonance space.

Through the third passage 190, the third resonance chamber becomes a space in which the noise introduced from the first resonance chamber 120 is reduced, and the first resonance chamber 120 is the noise introduced from the third resonance chamber. This can be a reduced space.

The third passage 190 may change the cross-sectional area and length according to the frequency of noise desired to be reduced.

The third passage 190 may be coated with a sound-absorbing layer coated on the first resonance chamber 120 or the resonance groove 170 .

In the foregoing, specific embodiments of the present invention have been described and illustrated, but it is common knowledge in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have

Therefore, such modifications or variations should not be individually understood from the technical spirit or viewpoint of the present invention, and it should be said that the modified embodiments belong to the claims of the present invention.

10: tire
11: tread
12: sidewall
13: shoulder
14: bead
15: inner liner
100: sound absorbing material
110: body
120: first resonance chamber
130: first passage
140: second resonance chamber
150: second passage
170: Gongmyeong Home
180: connection groove
190: third passage

Claims (10)

delete delete delete delete delete a plurality of bodies coupled to opposite surfaces of the tire tread;
a first resonance chamber formed inside the body;
a first passage connecting the first resonance chamber and the outside of the body;
a plurality of second resonance chambers formed on the inner sidewalls of the body; and
It includes a plurality of second passages connecting the first resonance chamber and the second resonance chamber,
The plurality of bodies have different shapes of the first resonance chamber, but have the same mass. a plurality of bodies coupled to opposite surfaces of the tire tread;
a first resonance chamber formed inside the body;
a first passage connecting the first resonance chamber and the outside of the body;
a plurality of second resonance chambers formed on the inner sidewalls of the body; and
It includes a plurality of second passages connecting the first resonance chamber and the second resonance chamber,
The sound absorbing material for a tire to which the Helmholtz resonator is applied, characterized in that the plurality of second resonance chambers are formed to have different volumes. a plurality of bodies coupled to opposite surfaces of the tire tread;
a first resonance chamber formed inside the body;
a first passage connecting the first resonance chamber and the outside of the body;
a plurality of second resonance chambers formed on the inner sidewalls of the body; and
It includes a plurality of second passages connecting the first resonance chamber and the second resonance chamber,
The sound absorbing material for a tire to which a Helmholtz resonator is applied, characterized in that the plurality of second resonance chambers are formed to have different shapes. a plurality of bodies coupled to opposite surfaces of the tire tread;
a first resonance chamber formed inside the body;
a first passage connecting the first resonance chamber and the outside of the body;
a plurality of second resonance chambers formed on the inner sidewalls of the body; and
It includes a plurality of second passages connecting the first resonance chamber and the second resonance chamber,
The body is formed with a resonance groove on the lower surface,
The body is a sound absorbing material for a tire to which a Helmholtz resonator is applied, characterized in that a connection groove connecting the resonance groove and the outside of the body is formed. 10. The method of claim 9,
The body is a sound absorbing material for a tire to which a Helmholtz resonator is applied, characterized in that a third passage connecting the first resonance chamber and the resonance groove is formed.

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