KR20200029764A - Wheel Assembly with Wave Pipe for Vehicle - Google Patents

Abstract

Disclosed is a vehicle wave tube wheel assembly. According to an embodiment of the present invention, provided is the vehicle wave tube wheel assembly, including: a wheel rim configured to mount a tire thereon and to form a cavity between the tire mounted on the wheel rim and the outer circumferential surface of the wheel rim; and a wave tube member disposed in the circumferential direction of the wheel rim on the outer circumferential surface of the wheel rim, and configured to generate offset sound having an inverse phase of resonance sound generated in the cavity.

Description

Wheel assembly with wave pipe for vehicle

The present disclosure relates to a wave tube wheel assembly for a vehicle.

The content described in this section merely provides background information for the present disclosure and does not constitute a prior art.

Cavity resonance refers to resonance generated within a cavity. The cavity is defined as the space between the tire mounted on the wheel rim and the outer circumferential surface of the wheel rim.

The cavity resonance is generated while the sound waves in the cavity form a specific sound pressure distribution due to the shape of the cavity. For example, the negative pressure generated in an open pipe with both ends blocked can form a specific distribution.

The shape of the cavity can be seen as a ring shape disposed along the circumferential direction of the wheel rim, and accordingly, the cavity can function as an open tube with both ends open. Specifically, when the tire is impacted from the outside, a specific sound pressure distribution due to interference may be formed in the cavity.

Cavity resonance, specifically, cavity noise generated due to cavity resonance, may be the biggest cause of road noise in a vehicle. Accordingly, a number of techniques for reducing the common noise have been developed and applied.

For example, conventionally, a dynamic damper provided in a suspension device of a vehicle, a sound absorbing material, a sound insulating material, etc. disposed in a cavity have been used.

However, these conventional noise reduction means have an effect of partially reducing the noise, but there is a problem in that the common noise cannot be fundamentally solved.

As another conventional noise reduction means, a sound absorbing tire was also used. However, the sound absorbing tire has a problem in that the tire shape is limited and the effect of the consumable tire cannot be sustained when the tire is replaced with a general tire having no sound absorbing function.

In addition, the cost of the sound absorbing tire is increased to form a sound absorbing structure on the tire, and the tire made of a rubber material has a problem in that the sound absorbing effect is not constant due to a temperature change.

And, as another conventional noise reduction means, a hollow sound absorbing wheel is also used to form a hollow in the wheel itself, but requires an additional process for bonding, has a high defect rate, and has a problem of increasing cost.

The root cause of this problem is that the vehicle and the wheels and tires applied thereto cannot be designed solely in consideration of joint noise, but can be regarded as condensed milk that is designed in consideration of weight and cost.

Korean Patent Publication No. 10-1999-0070125

Accordingly, the present invention has a primary object to provide a wave tube wheel assembly for a vehicle that can fundamentally solve cavity noise of a vehicle and reduce weight and cost.

According to an embodiment of the present invention, a wheel rim configured to mount a tire, the wheel rim configured to form a cavity between a tire mounted on the wheel rim and an outer circumferential surface of the wheel rim; And a wave tube member disposed along the circumferential direction of the wheel rim on the outer circumferential surface of the wheel rim, the wave tube member configured to generate an offset sound having an inverse phase of resonance sound generated in the cavity. Provides a spectacular wheel assembly.

As described above, according to the present embodiment, the vehicle wave tube wheel assembly has an effect capable of providing convenience for users by resolving road noise by fundamentally canceling noise generated in the cavity.

1 is an assembled perspective view of a vehicle wave tube wheel assembly according to an embodiment of the present disclosure.
2 is an exploded perspective view of a vehicle wave tube wheel assembly according to an embodiment of the present disclosure.
3 is a perspective view of a wave tube member according to an embodiment of the present disclosure.
4 is a side view of a wave tube member according to an embodiment of the present disclosure.
5 is a cross-sectional view showing a cross section in the AA direction of FIG. 3 in a state in which a wave tube member according to an embodiment of the present disclosure is mounted on a wheel rim.
6 is a cross-sectional view showing a state in which one end in the circumferential direction of the wave tube member and the other end in the circumferential direction of the wave tube member according to an embodiment of the present disclosure.
7 is a graph showing the resonant sound of the front ear when using the vehicle wave tube wheel assembly according to an embodiment of the present disclosure.
8 is a graph showing the resonance sound of the VIP seat outside when using the vehicle wave tube wheel assembly according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known configurations or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

In describing the components of the embodiment according to the present invention, first, second, i), ii), a), b), etc. may be used. These symbols are only for distinguishing the components from other components, and the essence or order or order of the components is not limited by the symbols. When a part of the specification refers to 'includes' or 'equips' a component, this means that other components may be further included rather than excluding other components, unless explicitly stated to the contrary. .

Terms such as radial direction, circumferential direction, and width direction used to describe the present invention are defined based on the wheel rim. Accordingly, the radial direction, the circumferential direction, and the width direction mean the radial direction of the wheel rim, the circumferential direction of the wheel rim, and the axial direction of the wheel rim, respectively.

1 is an assembly perspective view of a vehicle wave tube wheel assembly 10 according to an embodiment of the present disclosure.

2 is an exploded perspective view of a vehicle wave tube wheel assembly 10 according to an embodiment of the present disclosure.

1 and 2, the vehicle wave tube wheel assembly 10 includes a wheel rim 110 and a wave tube member 120.

The wheel rim 110 means an annular portion formed on the wheel W for a vehicle. A tire (not shown), a wave tube member 120, and the like may be mounted on the wheel rim 110.

The wheel rim 110 is configured to form a cavity between the tire mounted on the wheel rim 110 and the outer circumferential surface of the wheel rim 110.

The wave tube member 120 is disposed along the circumferential direction of the wheel rim 110 on the outer circumferential surface of the wheel rim 110.

The wave tube member 120 is configured to generate an offset sound having an inverse phase of the resonance sound generated in the cavity. Here, the resonance sound means cavity noise generated by cavity resonance generated in the cavity. A detailed description of the resonance sound is described in connection with FIGS. 3 and 4.

3 is a perspective view of a wavelength tube member 120 according to an embodiment of the present disclosure.

4 is a side view of the wave tube member 120 according to an embodiment of the present disclosure.

3 and 4, the wave tube member 120 includes a wave tube 122 and a link 124.

The wave tube 122 is disposed on the outer circumferential surface of the wheel rim 110 along the circumferential direction of the wheel rim 110.

To this end, the wavelength tube 122 may have an arc shape corresponding to the curved surface of the outer circumferential surface of the wheel rim 110.

The number of wavelength pipes 122 disposed on the wheel rim 110 may be a plurality, but the present invention is not limited thereto. For example, one wave tube 122 may be disposed on the wheel rim 110.

The wavelength tube 122 forms an offset sound generating space (M in FIG. 5) inside the wavelength tube 122, and forms a communication area E at one end in the circumferential direction of the wavelength tube 122.

The wavelength tube 122 has a lid shape with one surface facing the outer circumferential surface of the wheel rim 110 and the wavelength tube 122 covers the outer circumferential surface of the wheel rim 110 to form an offset sound generating space M However, the present invention is not limited thereto.

For example, the wavelength tube 122 may be closed on one surface facing the outer circumferential surface of the wheel rim 110, in this case, as the wavelength tube 122 itself, an offset sound generating space M may be formed.

The offset sound generating space M is configured to generate an offset sound, and the communication area E communicates the cavity with the offset sound generating space M.

The offset sound generated in the offset sound generating space M is transmitted to the cavity through the communication area E, and the resonance sound is attenuated by the offset sound transmitted to the cavity. In the following description, the principle of generating the offset sound and the principle of attenuating the resonance sound through the offset sound are described.

When the vehicle is driving, the tire may continuously be impacted by uneven ground. In the cavity, a specific sound pressure distribution can be formed by this impact, and this sound pressure distribution can generate sound waves in the cavity.

Acoustic waves in a cavity may form a standing wave at a specific frequency, aka resonance frequency, and thus resonance may occur within the cavity. Resonance in the cavity may cause noise, which is called cavity noise to resonance.

When it is assumed that the tire is cut in the width direction of the wheel rim 110 and the circumferential length component is unfolded flat, the cavity forms an open pipe structure.

In the open tube structure, a plurality of resonant frequencies may be provided, and a plurality of standing waves corresponding to each resonant frequency may be provided.

, 주파수를 f라 하면, 열린 관의 정상파는 L = n

/2(n은 자연수)에서 n이 짝수인 경우에 발생하게 된다.The length of the tire is called L, and the wavelength of the sound wave is

If frequency is f, standing wave of open tube is L = n

It occurs when n is even in / 2 (n is a natural number).

/2, 3

/2, 5

/2 인 경우에는, 열린 관의 시작점과 끝점의 위상이 서로 다르기 때문에, 공동 내에 정상파가 발생하지 않는다.If n is an odd natural number, for example, L =

/ 2, 3

/ 2, 5

In the case of / 2, since the phases of the start and end points of the open tube are different, no standing waves are generated in the cavity.

/2, 4

/2, 6

/2인 경우에는, 열린 관의 시작점과 끝점의 위상이 서로 같기 때문에, 공동 내에 정상파가 발생할 수 있다.Conversely, if n is an even natural number, for example, 2

/ 2, 4

/ 2, 6

In the case of / 2, since the phases of the start and end points of the open tube are the same, a standing wave may be generated in the cavity.

/2, 4

/2, 6

/2 중 2

/2에 해당하는 공명 주파수, 즉, 공동의 원주길이(L)와 동일한 크기의 파장(

)을 가지는 공명 주파수에서 가장 강력한 공명음이 발생하게 된다.In particular, based on experimental data, 2

/ 2, 4

/ 2, 6

Of 2/2

A resonance frequency corresponding to / 2, that is, a wavelength of the same size as the circumferential length (L) of the cavity (

), The strongest resonance sound is generated.

/2에 해당하는 공명 주파수의 공명음을 상쇄시키도록 설계될 수 있으며, 이를 위해, 특정한 수치를 가지도록 구성될 수 있다.Therefore, the wavelength tube 122, L = 2

It can be designed to cancel the resonance sound of the resonance frequency corresponding to / 2, for this purpose, it can be configured to have a specific value.

On the other hand, assuming that the circumferential length component of the wavelength tube 122 is spread out flatly, the wavelength tube 122 has one end open through the communication area E, and the side walls and wheels of the wavelength tube 122 It has a closed pipe structure whose side is closed by the outer circumferential surface of the rim 110.

, 주파수를 f라 하면, 닫힌 관의 정상파는 N = (2m-1)

/4(m은 자연수)에서 발생하게 된다. 즉, N = 1/4

, 3/4

, 5/4

인 경우에 파장관(122) 내에 정상파가 발생하게 된다.The length of the wavelength tube 122 is called N, and the wavelength of the sound wave is

If the frequency is f, the standing wave of the closed tube is N = (2m-1)

/ 4 (m is a natural number). That is, N = 1/4

, 3/4

, 5/4

In this case, a standing wave is generated in the wavelength tube 122.

의 파장을 가지는 공명음에대해 역위상을 가지게 된다.At this time, the standing wave generated within the wavelength tube 122 is

It has an inverse phase for a resonance sound having a wavelength of.

인 조건을 충족하도록 하는 길이를 가질 수 있다.Since the length N of the wavelength tube 122 increases as the size of m increases, when the wavelength tube 122 is m = 1, that is, N = 1/4

It may have a length to satisfy the phosphorus condition.

Specifically, the wavelength tube 122 may have a circumferential length corresponding to 1/4 of the wavelength of the resonance sound.

에 해당하는 공명 주파수의 공명음를 감쇄시키기 위한 파장관(122)의 원주방향 길이는 다음의 수학식을 통해 계산될 수 있다.For example, for sound velocity v = 340 m / s, radius of cavity r = 0.248 m (18-inch wheels), L = 2/2

The circumferential length of the wavelength tube 122 for attenuating the resonance sound of the resonance frequency corresponding to may be calculated through the following equation.

[Equation 1]

L = 2πr = 2/2

[Equation 2]

= f2πrv = f

= f2πr

[Equation 3]

f = v / (2πr) = 340 / (23.140.258) = 210Hz

[Equation 4]

= v/f = 340/210 = 1.62 m

= v / f = 340/210 = 1.62 m

에 해당되는 공명 주파수 f는 210Hz, 파장

는 1.62 m임을 알 수 있고,

/4는 0.405 m임을 알 수 있다.Through the above equation, L = 2/2

Corresponding resonance frequency f is 210 Hz, wavelength

It can be seen that 1.62 m,

It can be seen that / 4 is 0.405 m.

Therefore, when the cavity has an 18-inch value, which is the most common size, it is preferable that the wavelength tube 122 according to an embodiment of the present disclosure has a circumferential length of 0.405 m.

In this case, when the circumferential length of the wavelength tube 122 has a value corresponding to 1/4 of the total circumferential length of the cavity, considering that the circumferential length of the wheel rim 110 is slightly shorter than the circumferential length of the cavity, It is preferable that three wavelength tubes 122 are disposed on the wheel rim 110.

The plurality of wavelength tubes 122 may be configured to form a ring shape while surrounding the outer circumferential surface of the wheel rim 110 when disposed on the outer circumferential surface of the wheel rim 110.

In this case, the plurality of wavelength tubes 122 in the circumferential one end 121 of the wavelength tube member 120 in the state where the plurality of wavelength tubes 122 form an annular shape is the other end of the circumferential direction of the wavelength tube member 120 ( 123).

The wavelength tube 122 may be made of an elastic material such as rubber. The wave tube 122 made of an elastic material, even when the wave tube 122 is distorted, can be re-opened by the restoring force inside the wave tube 122, thereby changing the shape of the wave tube 122 The problem that the noise reduction effect is reduced can be prevented.

In order to reinforce the rigidity of the wave tube 122, a surface of the wave tube 122 may be sequentially coated with LDPE (Low Density Polyethylene) and HDPE (High Density Polyethylene). This coating prevents the absorption of resonant sounds and facilitates the formation of offset sounds.

The thickness of the wave tube 122 may be 1T or more and 2T or less, and the density of the wave tube 122 may be 1200 g / cm 2 or more and 1600 g / cm 2 or less.

When the thickness and density of the wavelength tube 122 have values smaller than these numerical ranges, the rigidity of the wavelength tube 122 is lowered, and vibrations may occur in the wavelength tube 122. At this time, the wavelength tube 122 may not function as a closed tube, so the noise reduction effect may be reduced.

Conversely, when the thickness and density of the wavelength tube 122 have values greater than these numerical ranges, the rigidity of the wavelength tube 122 may be increased, and adhesion to the wheel rim 110 may be lowered. The assembly may be deteriorated.

The link 124 is configured to connect between one circumferential end of the first wavelength tube and the other circumferential end of the second wavelength tube adjacent to the first wavelength tube among the plurality of wavelength tubes 122.

Here, the first wavelength tube and the second wavelength tube are relative concepts determined according to the arrangement relationship of the plurality of wavelength tubes 122. Therefore, the specific wavelength tube 122 is not fixed to the first wavelength tube or the second wavelength tube.

For example, when the first wavelength tube 122A is referred to as a first wavelength tube, the second wavelength tube 122B becomes a second wavelength tube. In addition, the second wavelength tube 122B may be referred to as a first wavelength tube, in which case, the third wavelength tube 122C becomes the second wavelength tube.

5 is a cross-sectional view illustrating a cross section in the direction A-A of FIG. 3 in a state in which the wave tube member 120 according to an embodiment of the present disclosure is mounted on the wheel rim 110.

Referring to FIG. 5, the vehicle wave tube wheel assembly 10 includes a first step 112 and a second step 114, and the wave tube member 120 includes a first side wall 126 and a second side. Includes month 128.

The first step 112 protrudes along the circumferential direction on the outer circumferential surface of the wheel rim 110.

The second step 114 is projected along the circumferential direction on the outer circumferential surface of the wheel rim 110, and is disposed spaced apart from the first step 112 in the width direction.

The wavelength tube 122 may be disposed between the first step 112 and the second step 114 on the outer circumferential surface of the wheel rim 110.

The first sidewall 126 extends from one end of the width of the wavelength tube 122 adjacent to the first step 112.

The second sidewall 128 extends from the other end in the width direction of the wavelength tube 122.

When the wave tube member 120 is disposed on the outer circumferential surface of the wheel rim 110, the first step 112 supports the first sidewall 126 in the inner width direction, and the second step 114 is made of The two side walls 128 can be supported in the inner width direction.

At this time, it is preferable that the length in the width direction of the first step 112 is greater than the thickness of the first side wall 126, and the length in the width direction of the second step 114 is greater than the thickness of the second side wall 128. .

The sidewalls 126 and 128 of the wave tube 122 are pressed in the inner width direction by the steppeds 112 and 114, so that the wave tube member 120 and the wave tube member 120 are outer circumferential surfaces of the wheel rim 110. It is prevented from rotating in the width direction while mounted on the top. Thus, the wave tube member 120 can be stably mounted on the wheel rim 110.

The wave tube member 120 may be attached on the outer circumferential surface of the wheel rim 110 by an adhesive member 410 positioned between the side walls 126 and 128 and the outer circumferential surface of the wheel rim 110. Thus, the wave tube member 120 can be prevented from deviating in the outer radial direction from the outer circumferential surface of the wheel rim 110.

The cross section of the wave tube 122 in the width direction may have a shape symmetrical to a normal S perpendicular to the outer circumferential surface of the wheel rim 110. This symmetrical shape is more advantageous for the impact protection of the wavelength tube 122.

6 is a cross-sectional view showing a state in which the circumferential end 121 of the waveguide member 120 and the other circumferential end 123 of the waveguide member 120 are fastened according to an embodiment of the present disclosure.

Referring to FIG. 6, the wave tube member 120 has a wave tube member 120 having a circumferential end 121 of the wave tube member 120 in a state in which a plurality of wave tube 122 forms a ring shape. It is configured to ultrasonic welding in an overlapped state with the other end 124 in the circumferential direction of).

7 is a graph showing the resonant sound of the front ear when using the vehicle wave tube wheel assembly 10 according to an embodiment of the present disclosure.

8 is a graph showing the resonance sound of the VIP seat outside when the vehicle wave tube wheel assembly 10 according to an embodiment of the present disclosure is used.

The experimental results shown in FIGS. 7 and 8 are derived based on an 18-inch wheel, and the RN displayed in the graph means road noise and the outer ear means window-side noise.

In addition, X is the size of the resonance sound when no noise reduction device is applied, Y is the size of the resonance sound when a dynamic damper is applied, and Z is a wavelength tube according to an embodiment of the present disclosure. The size of the resonance sound when the member 120 is applied is displayed.

In the case of X, the maximum value of the measured value is 53.7 dB in the graph of FIG. 7, and in the graph of FIG. 8, the maximum value of the measured value is 52.6 dB in the graph of FIG. 7 and in the graph of FIG. 8 It was measured at 57.7 dB.

In the graph of FIG. 7, in the case of Z, the maximum value of the measured value was measured to be 47.4 dB, which was measured to be 6.3 dB lower than in the case of X, and measured to be as low as 4.5 dB on average compared to X in the entire measurement section.

In the graph of FIG. 8, in the case of Z, the maximum value of the measured value was measured to be 51.6 dB, which was measured 7.1 dB lower than in the case of X, and was measured as an average of 4.6 dB lower than X in the entire measurement section.

When looking at the above-described experimental results, it can be seen that the wavelength tube member 120 has a very excellent resonance sound reduction effect than a dynamic damper.

By using a wave tube member having a low weight and cost, it is possible to eliminate a dynamic damper having a relatively high weight and cost, thereby improving productivity.

The above description is merely illustrative of the technical spirit of the present embodiment, and those skilled in the art to which this embodiment belongs may be able to make various modifications and variations without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical spirit of the present embodiment, but to explain, and the scope of the technical spirit of the present embodiment is not limited by these embodiments. The protection scope of the present embodiment should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present embodiment.

110: wheel rim 112: first step 114: second step
120: wave tube member 122: wave tube 124: link
126: first sidewall 128: second sidewall 410: adhesive member

Claims (13)

A wheel rim configured to mount a tire, comprising: a wheel rim configured to form a cavity between a tire mounted on the wheel rim and an outer circumferential surface of the wheel rim; And
A wavelength tube member disposed along the circumferential direction of the wheel rim on the outer circumferential surface of the wheel rim, wherein the wavelength tube member is configured to generate an offset sound having an inverse phase of resonance sound generated in the cavity
Vehicle wave tube wheel assembly comprising a. According to claim 1,
The wavelength tube member,
Arranged along the circumferential direction of the wheel rim on the outer circumferential surface of the wheel rim, forming an offset sound generating space configured to generate the offset sound therein, and communicating with the offset sound generating space and the cavity at one end in the circumferential direction Comprising one or more wavelength tubes forming a region,
The offset sound generated in the offset sound generating space is transmitted to the cavity through the communication area, and the resonance sound is configured to be attenuated by the offset sound
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 2,
The wave tube has an arc shape corresponding to the curved surface of the outer circumferential surface of the wheel rim,
The circumferential length of the wave tube is 1/4 of the circumferential length of the cavity
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 2,
The wave tube member includes a plurality of wave tube
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 4,
The wavelength tube member,
One or more links configured to connect between one circumferential end of the first wavelength tube and the other circumferential end of the second wavelength tube adjacent to the first wavelength tube among the plurality of wavelength tubes
Vehicle wavelength tube wheel assembly further comprising a. According to claim 4,
The plurality of wavelength tubes are configured to form a ring shape while surrounding the outer circumferential surface of the wheel rim when disposed on the outer circumferential surface of the wheel rim,
In the state in which the plurality of wavelength tubes form an annular shape, one end in the circumferential direction of the wavelength tube member is configured to be engaged with the other end in the circumferential direction of the wavelength tube member
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 2,
A first step protruding along the circumferential direction on the outer circumferential surface of the wheel rim; And
Further comprising a second step protruding along the circumferential direction on the outer circumferential surface of the wheel rim, and spaced apart in the width direction from the first step,
The wavelength tube is disposed between the first step and the second step on the outer circumferential surface of the wheel rim
Wavelength wheel assembly for a vehicle, characterized in that. The method of claim 7,
The wavelength tube member,
A first sidewall extending from one end of the width of the wave tube adjacent to the first step; And
Further comprising a second sidewall extending from the other end in the width direction of the wavelength tube,
When the wave tube member is disposed on the outer circumferential surface of the wheel rim, the first step supports the first sidewall in the inner width direction and the second step supports the second sidewall in the inner width direction.
Wavelength wheel assembly for a vehicle, characterized in that. The method of claim 8,
The width in the width direction of the first step is greater than the thickness of the first side wall, and the length in the width direction of the second step is greater than the thickness of the second side wall.
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 2,
The cross section in the width direction of the wave tube has a shape symmetrical to a normal perpendicular to the outer circumferential surface of the wheel rim.
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 2,
The wavelength tube is made of an elastic material
Wavelength wheel assembly for a vehicle, characterized in that. The method of claim 11,
The wavelength tube is made of rubber
Wavelength wheel assembly for a vehicle, characterized in that. According to claim 2,
The thickness of the wavelength tube is 1T or more
Characterized by a vehicle wave tube wheel assembly.

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