KR102169474B1 - Spiral band type sound absorber for tires - Google Patents

Abstract

A disclosed spiral band-type sound absorbing material for a tire can include a body that is spirally coupled to the inner surface of the tire and a chamber formed therein in the longitudinal direction of the body, thereby reducing noise by increasing a surface area while reducing the weight of the sound absorbing material and, at the same time, obtaining uniformity of the tire to which the sound absorbing material is attached.

Description

Spiral band type sound absorber for tires

The present invention relates to a sound-absorbing material for a tire of a spiral band type, and more particularly, to a sound-absorbing material for a tire of a spiral band type that is coupled to the inside of the tire so as to reduce noise generated from the tire.

In general, pneumatic tires have a support function that supports the overall 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 mitigates external shocks caused by irregular road surfaces, and the vehicle progression. It is equipped with a variety of location switching functions to change the location according to the direction.

The general structure of such a pneumatic tire is a tread, which is a thick rubber layer in direct contact with the road surface; A shoulder constituting the shoulder of the tire with the thickest thickness; A side wall on the side of the tire that improves the ride comfort through flexible flexion movement and displays the type, standard, and manufacturer of the tire; A bead surrounding the end of the cord paper so that the tire is mounted on the rim; A carcass made of tire cord paper, that is, a body ply, which forms the skeleton of a tire and withstands air pressure, load, or impact inside the tire, and a layer inserted inside the tread and the body ply. A belt layer that alleviates the impact of the tread and prevents cracks or trauma of the tread from directly reaching the body ply; It consists of an inner liner that prevents air from leaking with a rubber layer provided inside the body ply.

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 compressed air is filled in the cavity, the tire absorbs impact from the ground and supports the vehicle body.

However, by forming a cavity inside the tire, it provides a space for sound waves to resonate when driving the vehicle, thereby generating a cavity resonance sound due to vibration of the air, and the cavity resonance sound is transmitted to the exterior and interior of the vehicle. As a result, it caused dissatisfaction with the noise to drivers or passengers, and also caused noise pollution in the external surroundings.

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 a tire cavity.

The cavity resonance sound is generated when the tire tread vibrates due to irregularities on 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 reducing the noise level in the frequency band is important for reducing tire noise.

As a method of reducing noise caused by such a cavity resonance phenomenon, a number of methods have recently been proposed in which a sound absorbing material is attached to the inside of a tire to absorb vibration and noise. It is common to attach the sound-absorbing material to the bottom of the tire tread, and some have changed the mounting position of the sound-absorbing material in consideration of the flexion movement of the sidewall.

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

Korean Patent Laid-Open No. 10-2010-0005511'Low noise pneumatic tire with 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 each other at a 90 degree angle. Disclosed is a pneumatic tire characterized by having a structure.

An object of the present invention is to provide a sound-absorbing material for a helical band type tire with improved uniformity.

The object is a body that is helically coupled to the inner surface of the tire; And it can be achieved by the sound-absorbing material for a helical band type tire that may include a chamber formed therein along the longitudinal direction of the body.

In addition, the above object can be achieved by a sound-absorbing material for a tire of a spiral band type, wherein the body is a single continuous ribbon and can be cut into a predetermined length according to the type of tire and bonded to the inner surface of the tire.

In addition, the object, the body, the bottom portion in contact with the inner surface of the tire; Side wall portions coupled to both sides of the bottom portion; And a cover portion coupled to the sidewall portion, and the body is made of a flexible material and can be achieved by a sound absorbing material for a tire of a spiral band type that can be bent according to the deformation of the tire.

In addition, the above object can be achieved by a sound absorbing material for a tire of a spiral band type in which the width of the body is larger than the width of the cover.

In addition, the above object can be achieved by a sound absorbing material for a tire of a spiral band type, which is made of a solid material and can maintain its initial shape even when the air pressure inside the tire is lowered.

In addition, the above object may be achieved by a sound absorbing material for a tire of a spiral band type in which one or more channels connecting the chamber and the outside of the body may be formed in the body at predetermined intervals.

In addition, the above object can be achieved by a sound-absorbing material for a tire of a spiral band type in which the body can be formed with a partition wall dividing the chamber at predetermined intervals.

In addition, the above object can be achieved by a sound-absorbing material for a tire of a spiral band type in which a passage connecting chambers adjacent to the partition wall can be formed.

In addition, the above object can be achieved by a sound absorbing material for a tire of a spiral band type in which a plurality of first protrusions for dispersing noise can be formed on the outer surface of the body.

In addition, the above object can be achieved by a sound absorbing material for a tire of a spiral band type in which a plurality of second protrusions for dispersing noise can be formed on the inner surface of the body.

According to the sound-absorbing material for a tire of a spiral band type according to the present invention, the body is spirally coupled to the inner surface of the tire; And a chamber formed therein along the lengthwise direction of the body, thereby reducing the surface area while reducing the weight of the sound absorbing material, thereby obtaining a noise reduction effect, and at the same time obtaining the uniformity of the tire with the absorbing material attached thereto.

In addition, according to the sound-absorbing material for tires of the spiral band type according to the present invention, the body is one continuous ribbon and can be cut to a predetermined length according to the type of tire and bonded to the inner surface of the tire. Sound-absorbing material can be attached.

In addition, according to the sound-absorbing material for a helical band type tire according to the present invention, the bottom portion in contact with the inner surface of the tire; Side wall portions coupled to both sides of the bottom portion; And a cover portion coupled to the sidewall portion, and the body is made of a flexible material and can be bent according to the deformation of the tire, so that damage to the sound absorbing material on an uneven road surface can be prevented.

Further, according to the sound-absorbing material for a tire of the spiral band type according to the present invention, the width of the bottom portion of the body may be larger than the width of the cover portion, so that the area in which the sound-absorbing material is attached to the tire can be increased.

In addition, according to the sound-absorbing material for a tire of the spiral band type according to the present invention, the cover is made of a hard material, so that the initial shape can be maintained even when the air pressure inside the tire is lowered. It can keep its shape.

In addition, according to the sound absorbing material for a tire of the spiral band type according to the present invention, the body may have one or more channels connecting the chamber and the outside of the body at predetermined intervals, so that the chamber of the sound absorbing material may serve as a resonator. .

In addition, according to the sound-absorbing material for a tire of the spiral band type according to the present invention, the body may be formed with a partition wall dividing the chamber at predetermined intervals, it is possible to increase the rigidity of the sound-absorbing material.

In addition, according to the sound-absorbing material for tires of the spiral band type according to the present invention, since the body may have a passage connecting the chambers adjacent to the partition wall, the sound absorbing material is damaged by ensuring the rigidity of the sound-absorbing material and allowing the partition wall to be easily deformed. Can be prevented.

It is possible to prevent damage due to the sudden volume change of the chamber.

In addition, according to the sound-absorbing material for a tire of the spiral band type according to the present invention, a plurality of first protrusions for distributing noise may be formed on the outer surface of the body, so that noise on the outer surface of the sound-absorbing material may be reduced.

In addition, according to the sound-absorbing material for a tire of the spiral band type according to the present invention, a plurality of second protrusions for distributing noise may be formed on the inner surface of the body, so that noise can be more effectively reduced in the chamber of the sound-absorbing material.

1 is a perspective view of a sound absorbing material for a helical band type tire according to the present invention.
2 is a front view of a sound absorbing material for a helical band type tire according to the present invention.
3 is a partial cross-sectional view of FIG. 1 taken along line XX′.
4 is a partial cross-sectional view of FIG. 2 taken along line YY'.
Figure 5 shows that the protrusion is formed on the body in Figure 3.
6 is a perspective view of a part of a tire having a sound absorbing material for a tire of a spiral band type according to the present invention installed therein.

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

However, in describing the present invention, a description of a function or configuration that is already known 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 determined for convenience of explanation, not for the purpose of limitation of rights, and the X axis indicates the front (arrow side) and rear (opposite the arrow) direction, and the Y axis direction left and right. And the Z axis is defined as indicating the up and down directions.

Each direction to be described below is based on this, except for a case otherwise specifically limited.

In the description and claims of the invention, the upper (upper), lower (lower), left and right (lateral or lateral), front (front, front), rear (fold, rear), etc., which refer to directions, etc. For convenience of description, it is determined based on the relative position between the drawings and the components, and each direction described below is based on this, except for cases specifically limited differently.

The Helmholtz resonance principle applied to the present invention will be schematically described.

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

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

The Helmholtz resonance frequency is shown in Equation 1 below.

f: Helmholtz's resonance frequency

C: the speed of sound of the fluid

S: cross-sectional area of fluid inlet

L: length of fluid inlet

V: volume of the resonance space

1 to 6,

The sound-absorbing material for a helical band-type tire includes a body 30 that is spirally coupled to the inner surface of the tire 10; And a chamber 40 formed therein along the longitudinal direction of the body 30.

1 to 3, the body 30 is a part corresponding to the skeleton constituting the sound-absorbing material 20, and the body 30 may be formed in the form of one continuous ribbon.

The body 30 may be made of synthetic resin or rubber such as polypropylene or polyurethane in order to absorb noise from the tire 10.

The body 30 is made of a flexible material and can be bent according to the deformation of the tire 10.

The body 30 may be made of a porous material (porous foam).

In the porous material, a fine hole formed in the material may be a passage 36 through which noise flows into the chamber 40.

The body 30 formed in the form of one continuous ribbon can be wound on a roller or the like and stored in a large amount.

The body 30 formed in the form of one continuous ribbon may be cut to a predetermined length according to the type of tire 10 formed in various sizes, and then coupled to the inner surface of the tire 10.

Referring to FIG. 6, the body 30 may be coupled in a spiral shape from the inner liner 15 on one side of the tire 10 to the inner liner 15 on the other side.

The body 30 coupled in a helical shape may adjust the spacing with the neighboring body 30 as necessary.

The body 30 coupled in a spiral shape is coupled to the inner surface of the tire 10 at the same interval as the neighboring body 30 to prevent the uniformity of the tire 10 from deteriorating.

The body 30 coupled in a spiral shape may be formed to have a circular shape facing both sides of the rotation axis in parallel.

The body 30 is preferably formed so as to contact each other when moving in parallel at both ends in the longitudinal direction.

The body 30 is preferably formed so as to contact each other when moving in parallel at both ends in the longitudinal direction.

The body 30 includes a bottom portion 31 in contact with the inner surface of the tire 10, a side wall portion 32 coupled to both sides of the bottom portion 31, and a cover portion 33 coupled on the side wall portion 32 It may include.

Based on the chamber 40 formed along the lengthwise interior of the body 30, the bottom part 31 is located under the chamber 40, and the side wall parts 32 are located on both sides of the chamber 40. It is located, and the cover part 33 is located above the chamber 40.

The body 30 has a width of the bottom portion 31 that is larger than the width of the cover portion 33 so that an area attached to the inner surface of the tire 10 may be increased.

The body 30 may include at least one of the bottom portion 31, the side wall portion 32, and the cover portion 33 made of a flexible material.

The flexible material may be selected from plastics having characteristics that can be deformed together with the tire 10 when the tire 10 is deformed due to an uneven road surface or the like.

The body 30 may have any one or more of the bottom portion 31, the side wall portion 32, and the cover portion 33 made of a hard material.

The hard material may be selected from plastics having characteristics that can withstand the tire 10 so as not to be crushed when the pressure inside the tire 10 is lowered due to a puncture or the like.

The body 30 may be formed of one or more of the bottom portion 31, the side wall portion 32, and the cover portion 33 of a flexible material, and any one or more of the remaining material of a hard material.

The body 30 may have a bottom portion 31 and a side wall portion 32 made of a flexible material, and the cover portion 33 made of a hard material.

If the bottom portion 31 and the side wall portion 32 are formed of a flexible material, when the tire 10 is deformed by an uneven road surface, the body 30 is deformed together with the tire 10 to prevent damage. have.

If the cover portion 33 is formed of a solid material, when the pressure inside the tire 10 is lowered due to a puncture or the like, the tire 10 can travel a predetermined distance without being crushed, thereby preventing a safety accident.

Referring to FIGS. 3 to 4, the chamber 40 is a space formed long inside the body 30 along the length direction of the body 30, which helps to reduce the weight of the sound absorbing material 20 and increases the surface area of the sound absorbing material.

The body 30 may have one or more channels 35 connecting the chamber 40 and the outside of the body 30 at predetermined intervals.

The channel 35 may be formed in the side wall portion 32 and/or the cover portion 33 of the body 30.

The channel 35 is a space through which noise outside the sound absorbing material 20 flows into the chamber 40.

When the channel 35 is formed, the chamber 40 may be a space in which noise introduced from the outside is reduced.

The channel 35 may change the cross-sectional area and length according to the frequency of the noise desired to be reduced.

The channel 35 may have an outer cross-sectional area larger than an inner cross-sectional area to increase an inlet through which noise is introduced.

The channel 35 may substantially expand the volume of the resonance space by forming an outer cross-sectional area smaller than an inner cross-sectional area.

The channel 35 is formed so as to face at least one pair on the side of the body 30 to secure more paths through which noise is introduced.

The chamber 40 may reduce noise introduced through the channel 35 using the Helmholtz resonance principle.

The body 30 may have a partition wall 34 that divides the chamber 40 at predetermined intervals.

The chamber 40 may be divided into several by partitions 34 formed at predetermined intervals.

The partition walls 34 are formed in the body 30 at predetermined intervals to separate the chamber 40 and at the same time help to secure the rigidity of the sound-absorbing material.

The body 30 may have a passage 36 that connects the chamber 40 adjacent to the partition wall 34.

The passage 36 connects neighboring chambers 40 separated by partition walls 34.

Noise introduced into one of the chambers 40 may be reduced by moving to the neighboring chamber 40 through the passage 36.

When the tire 10 is deformed due to an uneven road surface or the like, the passage 36 allows the partition wall 34 to be easily deformed, thereby preventing damage to the sound absorbing material 20.

The chamber 40 may be coated with a sound-absorbing layer on its surface.

The sound-absorbing layer may absorb noise introduced into the chamber 40.

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

The channel 35 may be coated with the sound-absorbing layer coated on the chamber 40 together.

Referring to FIG. 5, the body 30 may have a plurality of first protrusions 37 for dispersing noise on the outer surface.

The body 30 may be formed with a plurality of second protrusions 38 for dispersing noise on the inner surface.

The first protrusion 37 and the second protrusion 38 may refract, reflect, or disperse noise waves.

The first protrusion 37 and the second protrusion 38 may have different shapes, sizes, arrangements, and numbers depending on the frequency of the noise desired to be absorbed.

The first protrusion 37 and the second protrusion 38 may be coated with a sound-absorbing layer on the surface.

The sound-absorbing layer may absorb noise hitting the first protrusion 37 or the second protrusion 38.

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

In the above, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and 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 the modified embodiments should be said to belong to the claims of the present invention.

10: tire
11: tread
12: sidewall
13: shoulder
14: bead
15: inner liner
20: sound-absorbing material
30: body
31: bottom
32: side wall portion
33: cover
34: bulkhead
35: channel
36: passage
37: first protrusion
38: second protrusion
40: chamber

Claims (10)

A body spirally coupled to the inner surface of the tire; And a chamber formed therein along the longitudinal direction of the body,
The body,
A bottom portion in contact with the inner surface of the tire; Side wall portions coupled to both sides of the bottom portion; And a cover portion coupled to the sidewall portion,
The body is made of a flexible material and can be bent according to the deformation of the tire,
The body has a width of the bottom portion greater than that of the cover portion,
The cover is made of a hard material so that the initial shape can be maintained even when the air pressure inside the tire is lowered,
The body has one or more channels connecting the chamber and the outside of the body at predetermined intervals,
The body has a partition wall dividing the chamber at a predetermined interval,
The body is a sound-absorbing material for a spiral band type tire, characterized in that the passage connecting the chamber adjacent to the partition wall is formed. The method of claim 1,
The body is a single continuous ribbon, and a spiral band type sound absorbing material for tires, characterized in that it can be cut into a predetermined length according to the type of tire and bonded to the inner surface of the tire. delete delete delete delete delete delete The method of claim 1,
The body is a sound-absorbing material for a spiral band type tire, characterized in that a plurality of first protrusions for distributing noise are formed on an outer surface. The method of claim 9,
The body is a sound-absorbing material for a spiral band type tire, characterized in that a plurality of second protrusions for dispersing noise are formed on the inner surface.

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