KR20040031509A - Tire Having Low Noise - Google Patents

Abstract

PURPOSE: A noiseless tire is provided to reduce vibration and noise while not affecting such performances as drivability, wear, wet traction, and the like by inserting a shock-absorbing layer of foam rubber under a tread of the tire. CONSTITUTION: A noiseless tire(10A) includes a tread(1) contacting with a road surface, and a belt layer(4) disposed under the tread. In the noiseless tire, a shock-absorbing layer(2) is inserted between the tread and the belt layer. Another shock-absorbing layer(2a) is additionally installed at the end of the belt layer. The shock-absorbing layers are made of foam rubber. The diameter of the cavity of the foam rubber is 30¯100 micron m.

Description

Tires with Low Noise

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low noise tire, and more particularly, to a tire in which an impact absorbing layer made of foam rubber is provided under a tread, thereby reducing vibration and noise generated by excitation from the road surface while driving. .

There are various paths to the occurrence of vibration and noise of tires, but in general, the main cause is the excitation force from the road surface. That is, as shown in Fig. 1 showing a sectional view of the radial tire for a passenger car, the excitation from the road surface G is transmitted to the belt layers 13 and 15 under the tread 11, and the belt layers 13 and 15 Vibration violently at the tip ("E" part). This vibration causes the side wall S of the tire to vibrate, as in the arrow A of the waveform, causing vibration of the entire tire 10. In addition, this road excitation causes the entire tire to vibrate and is transmitted to the vehicle axle with the resonance vibration inside the tire to cause the interior noise of the vehicle.

In order to reduce the excitation force of the tread from the road surface, a low noise tire was designed using a low stiff tread rubber, but by using a low stiff tread rubber, wet traction and adjustment stability There was a problem of deteriorating running performance.

Another conventional technique has been a technique for reducing noise by adding a capsule (capsule) to the cap tread (cap tread), but this technique could not be expected to increase the tire cost as well as a revolutionary low noise effect.

The present invention has been proposed to solve the above problems, the object of which is to insert a shock absorbing layer of foam rubber under the tread of the tire, so that the vibration and vibration without affecting other performance, such as adjustment stability, wear, wet traction, etc. To provide a tire with reduced noise.

1 is a partial cross-sectional structural view of a conventional passenger car radial tire in a state of being in contact with a road surface.

2 is a cross-sectional structural view of a tire of the present invention in a state of being in contact with a road surface.

Explanation of symbols on the main parts of the drawings

1 .... Tread 2, 2a ..... Shock Absorbing Layer

4 ..... Belt layer

The low noise tire of the present invention for achieving the above object is a tire including a tread in contact with a road surface and a belt layer positioned below the tread, wherein an impact absorbing layer is inserted between the tread and the belt layer.

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

Figure 2 is an example of a cross-sectional structure for a low noise tire according to the present invention, showing a state in contact with the road surface.

As shown in FIG. 2, the tire 10A according to the invention comprises a tread 1 in contact with the road surface G and a belt layer 4 located below the tread, in particular with the tread 1. The shock absorbing layer 2 is provided between the belt layers 4.

In addition to the shock absorbing layer, another shock absorbing layer 2a may be further provided at the end of the belt layer 4.

In the present invention, the shock absorbing layer (2, 2a) is composed of a foam rubber, preferably, the foam rubber has a diameter of 30 ~ 100㎛.

The shock absorbing layer 2 located between the tread 1 and the belt layer 4 is preferably installed to have the same width and length as the second belt 5 of the belt layers.

Moreover, it is preferable that the other shock absorbing layer 2a provided in the belt end has the width | variety three times or more of the belt step B, and the height shall be within 1/2 of the width.

When the shock absorbing layer 2 made of foam rubber is installed between the tread 1 and the belt layer 4 according to the present invention, the road surface excitation force perpendicular to the tire ground plane is minimized and the road surface excitation that is transmitted is foamed rubber. The cavity is absorbed and finally suppresses the vibration transmitted to the belt layer 4 to reduce the noise.

Furthermore, when the shock absorbing layer 2 is provided between the tread 1 and the belt layer 4 as well as another shock absorbing layer 2a is provided at the end of the belt layer 4, the sidewall layer in the belt layer It is more effective in reducing tire vibration by absorbing more and more vibration transmitted to the vehicle.

Hereinafter, the effect on the tire of the present invention will be described through specific examples. However, the following examples are only for illustrating the present invention, and it will be apparent to those skilled in the art that the scope of the present invention is not limited to the following examples according to the gist of the present invention.

EXAMPLE

A radial tire (standard P205 / 65R15) was manufactured by installing a shock absorbing layer having various lengths and widths between the tread and the belt layer of the tire and the end of the belt layer using foam rubber. At this time, the foam rubber was used a foam rubber having a cavity diameter of about 50㎛.

In the case of Inventive Example (3), the shock absorbing layer was inserted only between the tread and the belt layer.

The tires thus manufactured were evaluated for various performances such as road noise, passage noise, wet traction, and adjustment stability, and compared with those of conventional tires, and the results are shown in Table 1. In Table 1, the numbers indicate the result of performance improvement based on the conventional example as 100 (for example, 120 is indicated when the performance is improved by 20% over the conventional example).

division Shock absorber Experiment result Between tread and belt layer Belt end Load noise Pass noise Wet traction Adjustable stability Conventional example none none 100 100 100 100 Inventive Example 1 Same as 2nd belt width has exist 120 120 100 99 Inventive Example 2 1/2 of second belt width has exist 115 112 100 99 Inventive Example 3 Same as 2nd belt width none 110 110 100 99

As shown in Table 1, in the case of Inventive Example (1-3) in which foam rubber is applied under the cap tread, the road noise and the pass noise are significantly improved compared to the conventional example, and the wet traction and the adjustment stability are almost the same. Not lost. In particular, as inventive example (3), it was found that when the other foam rubber is applied to the belt end, the noise effect is further increased.

As described above, according to the present invention, there is an effect of preventing vibration without increasing the weight of the tire, and at the same time reducing the noise of the tire while maintaining the adjustment stability and the wet traction performance.

Claims (6)

A tire comprising a tread in contact with a road surface and a belt layer located below the tread, Low noise tire, characterized in that the shock absorbing layer (2) is inserted between the tread (1) and the belt layer (4). The method of claim 1, Low noise tire, characterized in that the shock absorbing layer (2) is inserted between the tread (1) and the belt layer (4), the other shock absorbing layer (2a) is further provided at the end of the belt layer (2). The method according to claim 1 or 2, Low noise tire, characterized in that the impact absorbing layer (2, 2a) is a foam rubber. The method of claim 3, The foam rubber is a low noise tire, characterized in that the diameter of the cavity having a size of 30 ~ 100㎛. The method of claim 1, The low noise tire, characterized in that the shock absorbing layer (2) is installed to have the same width and length as the second belt (5) of the belt layer. The method of claim 2, The other noise absorbing layer (2a) provided at the end of the belt has a width three times or more that of the belt step (B), and the height is less than half of the width, characterized in that the low noise tire.