KR102684344B1 - A pneumatic tire with sound absorption - Google Patents

Abstract

The present invention discloses a pneumatic tire equipped with a sound-absorbing material.
The pneumatic tire equipped with a sound-absorbing material according to the present invention is characterized by comprising a sound-absorbing material layer including a magnet portion, and an opposing magnet portion provided in an opposing portion of the tire opposing the magnet portion and interacting with the magnet portion. According to this, the magnetic force By floating a sound-absorbing material between the vehicle wheel and tire, the puncture can be easily filled by injecting sealant in the event of a tire puncture, and noise from the tire can be reduced while driving.

Description

A pneumatic tire with sound absorption}

The present invention relates to a pneumatic tire equipped with a sound-absorbing material. More specifically, the present invention relates to a pneumatic tire having a sound-absorbing material, and more specifically, by floating the sound-absorbing material between the vehicle wheel and the tire using magnetic force, the puncture can be easily filled by injecting sealant in the event of a tire puncture. This relates to pneumatic tires equipped with sound-absorbing materials that can reduce tire noise while driving.

When the pneumatic tire 10 is fastened and mounted on the rim of the vehicle wheel 20, a cavity 10' having a certain pressure is formed inside the tire, and in this cavity, the tire moves when the vehicle is driven. Depending on the type of bending, various sound waves can be generated and resonate, that is, cavity resonance caused by air vibration.

This joint resonance sound is transmitted to the outside and inside of the vehicle, causing noise complaints in drivers or passengers, and also causing noise pollution in the external surrounding environment.

The frequency of the cavity resonance sound is known to be around 200 to 250 Hz, and lowering the noise level in the frequency band is important for reducing tire noise. In particular, as the electric vehicle market grows, the existing internal combustion engine As noise and vibration disappear, the noise can be heard relatively louder, causing complaints from many passengers.

As a method of reducing noise caused by this cavity resonance phenomenon, many methods have been proposed recently to absorb vibration and noise by attaching a sound-absorbing material 30 to the inner bottom of the tire.

Recently, to improve fuel efficiency, instead of installing a spare tire on a vehicle, a tire repair kit is installed. When a tire puncture (P) occurs, fluid sealant (LS) is injected using the tire repair kit to prevent the puncture. The tire is being repaired by moving the sealant to the area and filling the puncture area (P).

However, as can be seen in FIG. 5, the sealant LS injected into one side of the tire is blocked or absorbed by the sound absorbing material 30, making it difficult to move, so the sealant cannot flow and move to the punctured area P. , As a result, there is a problem of not being able to fill the puncture area (P).

In particular, since the sound-absorbing material 30 is made of a non-woven fabric or a foam material, it absorbs the liquid sealant (LS) well, so there are frequent problems in which the sealant is not supplied to the puncture site (P).

KR 10-2021-0155700 A (Publication date December 23, 2021)

The present invention uses magnetic force to levitate a sound-absorbing material between a vehicle wheel and a tire, so that in case of a tire puncture, the puncture can be easily filled by injecting sealant, and an air inlet equipped with a sound-absorbing material can reduce tire noise during driving. Tires are provided.

In order to solve the above-described technical problem, the present invention provides a sound-absorbing material comprising a sound-absorbing material layer including a magnet portion, and an opposing magnet portion that is provided in an opposing portion of a tire facing the magnet portion and interacts with the magnet portion. We provide pneumatic tires.

According to another embodiment of the present invention, the magnet portion may be continuously arranged along the inner circumferential space of the tire by a connection portion.

According to another embodiment of the present invention, the magnetic switching unit provided on the vehicle wheel located opposite to the magnet unit may interact with the magnet unit by force.

According to the pneumatic tire equipped with a sound-absorbing material according to the present invention, the sound-absorbing material is levitated between the vehicle wheel and the tire using magnetic force, so that in the event of a tire puncture, the puncture can be easily filled by injecting sealant, and also reduces tire noise during driving. It has the effect of reducing.

1 is a cross-sectional view of a tire according to the present invention mounted on a vehicle wheel;
Figure 2 is a perspective perspective view showing the sound-absorbing material and magnet portion according to the present invention,
Figure 3 is a diagram showing the magnet parts of the present invention connected by a connection part,
Figure 4 is a diagram showing the cross-sectional area of the magnet unit, opposing magnet unit, and magnetic switching unit in the present invention, and showing a tire mounted on a vehicle wheel;
Figure 5 is a cross-sectional view of a conventional tire mounted on a vehicle wheel, showing a shape in which sealant (LS) is injected in a punctured state (P) and the sealant cannot easily move to the puncture site due to the sound absorbing material.

Hereinafter, the present invention will be described in detail.

However, it should be noted that the technical terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention.

In addition, the technical terms used in the present invention, unless specifically defined in a different sense in the present invention, should be interpreted as meanings generally understood by those skilled in the art in the technical field to which the present invention pertains, and are not overly comprehensive. It should not be construed in a literal or excessively reduced sense, and if the technical term used in the present invention is an incorrect technical term that does not accurately express the idea of the present invention, it should be used as a technical term that can be correctly understood by a person skilled in the art. It should be understood as a replacement, and general terms used in the present invention should be interpreted as defined in the dictionary or according to the context, and should not be interpreted in an excessively reduced sense, and the singular terms used in the present invention The expression includes plural expressions unless the context clearly indicates otherwise, and in the present invention, terms such as 'consists' or 'comprises' necessarily include all of the various components or steps described in the invention. It should not be construed that some of the components or steps may not be included, or that additional components or steps may be included, and in describing the present invention, related known technologies should be used. If it is determined that a detailed description may obscure the gist of the present invention, the detailed description will be omitted.

Figure 1 is a cross-sectional view of the tire according to the present invention mounted on a vehicle wheel, Figure 2 is a perspective view showing the sound absorbing material and the magnet part according to the present invention, and Figure 3 shows the magnet parts of the present invention connected by a connection part. It is a drawing showing, and FIG. 4 is a cross-sectional representation of the magnet portion, opposing magnet portion, and magnetic switching portion in the present invention, and is a diagram showing a tire mounted on a vehicle wheel. Please refer to this.

The pneumatic tire 100 equipped with a sound-absorbing material according to the present invention is provided in a sound-absorbing material layer 300 including a magnet portion 200 and an opposing portion 110 of the tire facing the magnet portion to interact with the magnet portion. It is characterized in that it includes an opposing magnet portion 500.

As long as the sound absorbing material 300 can absorb noise generated inside the tire, there is no need to specifically limit the materials that can be used. For example, various materials such as non-woven fabric, foamable polymer resin, and porous resin can be used.

In addition, the sound-absorbing material includes a magnet portion 200, and the magnet portion may be embedded inside the sound-absorbing material or attached to the outside. There is no need to limit the type of magnet used in the magnet portion, but the tire may be manufactured. Ferrite magnets can be used, which are stable even in the thermal environment experienced in urban environments and are easy to process into various shapes.

This magnet portion 200 can be made the same as the width of the opposing magnet portion 500, and its width can be set to 30 to 50% of the belt width, which reduces stain energy and movement during tire stretching. By keeping the distance from the largest belt end, the movement of the opposing magnet portion 500 can be minimized by force in directions other than the vertical movement direction of the tire.

Therefore, if it is less than 30%, there is a problem that the force that can levitate the absorbent material becomes small, and conversely, if it exceeds 50%, the force received at the end of the belt may be transmitted and durability may be deteriorated.

Here, the sound absorbing material 300 preferably has a volume of 10 to 30% of the lumen volume of the tire. If it is less than 10 volume%, noise generation may increase, and if it exceeds 30 volume%, the tire may be damaged when the tire is driven. If the interior and the sound-absorbing material come into contact with each other, durability may be reduced or the direction of magnetic force may change, causing problems with the arrangement of the sound-absorbing material.

In addition, the thickness of the sound absorbing material 300 is preferably between 5 and 60 mm. If it is less than 5 mm, noise may increase, and if it exceeds 60 mm, it may come into contact with the inside of the tire when the tire is driven. Problems with durability and problems that could destroy the balance of power for existing magnets may occur.

In addition, the thickness of the magnet portion 200 is preferably 1/4 to 1/2 of the sound absorbing material 300. If it is less than 1/4, the magnets that can be used are extremely limited, making tire design difficult, and conversely, if it is less than 1/4, the thickness of the magnet portion 200 is 1/4 to 1/2. Exceeding this may result in an unnecessary increase in the weight of the tire.

In addition, the circumference of the upper part of the sound absorbing material can be set to be approximately 6 mm larger than the circumference of the lower part of the tire inner liner so that the average distance between the tire and the sound absorbing material is 3 mm. In this case, the sound absorbing material is continuously along the inner space of the tire. If they are arranged, the benefit will be great, and not only that, a plurality of sound-absorbing materials can be provided separately and arranged intermittently.

Regardless of whether the sound absorbing material is continuously or intermittently disposed, the magnet portion 200 included therein may be continuously arranged along the inner circumferential space of the tire by the connection portion 400.

In other words, the magnet portions 200' and 200" are disposed in the inner circumferential space of the tire by the connection portion 400, and the opposing magnet portion is located on the opposing portion 110 of the tire facing the magnet portions 200' and 200". (500' 500") can be arranged.

The opposing magnet portion (500' 500") may be interposed between the inner surface of the tire, the inner liner, the carcass ply, or the belt layer. There is no need to limit the type of magnet used here, but it may be used when the tire is manufactured. Ferrite magnets can be used, which are stable even in thermal environments and can be easily processed into various shapes.

In addition, the magnet parts 200' and 200" are connected to the connection part 400 and arranged in the inner circumferential space of the tire, so that the mutual attraction or repulsion force is generated by the opposing magnet or the magnetic switching part 600 provided on the vehicle wheel 20. Since the action occurs and the flow must be easy to a certain extent, the heat connection member may include a corrugated portion 400'.

The wrinkle part 400' has a plurality of curved surfaces, so that when the interconnected magnet parts 200' and 200" flow, the curved shape is easily transformed into a widening or shrinking shape, so that the sound-absorbing material is on the inner surface of the tire. can be easily separated from.

On the other hand, the magnetic switching unit 600 provided on the vehicle wheel 20 is disposed in a position opposite to the magnet unit, so that when power (EP) is supplied, the magnetic switching unit is turned on (magnetic on), and the magnet unit is attracted. The interaction pulls the magnet part and separates the sound-absorbing material from the inner peripheral surface of the tire, so the puncture site (P) can be repaired with the injected sealant (LS) without interference from the sound-absorbing material.

Here, in order to separate the sound-absorbing material 300, the magnetic switching unit 600 and the magnet unit 200 exert an attractive force, and the magnet unit 200 and the opposing magnet unit 500 have a magnetic polarity so as to interact with a repulsive force. This can be determined.

In addition, if it is necessary to attach the sound-absorbing material to the inner surface of the tire, the magnet portion 200 and the opposing magnet portion 500 are arranged with the polarity of attraction, and if it is necessary to separate the sound-absorbing materials in this case, the magnetic switching unit ( 600) and the magnet unit must be arranged with the polarity of attraction. In this case, the attraction between the magnet switching unit 600 and the magnet unit must be large enough for the magnet unit 200 and the opposing magnet unit 500 to be separated.

Here, the magnetic force of the magnet switching unit 600 is preferably 5000 to 7000 (G, gauss), which is due to the repulsive force between the magnet unit 200 and the opposing magnet unit 500 and the magnet unit 200 and the magnet switching unit ( By maintaining the balance of forces between the magnets (600), the distance between the magnet portion (200) and the opposing magnet portion (500) can be kept constant.

Pneumatic tire 100, magnet part 200, sound absorbing material layer 300, opposing part 110, opposing magnet part 500.

Claims (3)

A sound-absorbing material layer including a magnet portion;
It includes an opposing magnet part that is provided in the opposing part of the tire opposite the magnet part and interacts with the magnet part,
A pneumatic tire with a sound-absorbing material, wherein the magnet portion is continuously arranged along the inner circumferential space of the tire by a connection portion.
delete According to claim 1,
A pneumatic tire equipped with a sound-absorbing material, characterized in that the magnetic switching unit provided on the vehicle wheel at a position opposite the magnet unit interacts with the magnet unit and attraction.