KR101365549B1 - Non-pneumatic tire - Google Patents

Abstract

The present invention relates to a non-pneumatic tire that does not use air pressure.
According to the embodiments of the present invention, the outer band may be formed asymmetrically along the longitudinal direction to form an excellent outer strength compared to the inner side of the outer band. In addition, the outer band is divided into a plurality of regions along the longitudinal direction, and the number of spokes connected to each region is varied so that the frequency dispersion ratio is one of the major triads, so that the outer band is brought into contact with the ground. Has the effect of improving noise.

Description

Non-Pneumatic Tires {NON-PNEUMATIC TIRE}

The present invention relates to a non-pneumatic tire that does not use air pressure.

Non-pneumatic tires use the elasticity of circular bands and spokes, including treads, to absorb the impact that occurs when the tire is in contact with the ground and support the load of the vehicle.

When the non-pneumatic tire is in contact with the ground, noise is generated due to friction between the tire and the ground.

In addition, the amount of impact applied to the outside compared to the inside of the tire when cornering has a problem that the outside of the tire is easily worn or damaged compared to the inside.

Republic of Korea Patent Publication No. 10-1987-0010970 (non-air tire with vibration reduction feature) 1987.12.19. Republic of Korea Patent Publication No. 10-2011-0031693 (Stiff Tread Non-pneumatic Tire) 2011.03.29.

In order to solve the above problems, the present invention is to provide a non-pneumatic tire that can be improved noise generation.

It is also an object of the present invention to provide a non-pneumatic tire having excellent outer rigidity.

The non-pneumatic tire of the present invention is a non-pneumatic tire in which a plurality of spokes are arranged along a circumference of an outer band, wherein the first spoke portion and the outer band of which a plurality of first spokes are arranged on one side of the outer band. And a third spoke portion having a plurality of third spokes arranged on the other side of the circumference, wherein the first spoke portion and the third spoke portion are formed asymmetrically with each other so that the stiffness of one side and the other side of the outer band is different from each other. have.

And a second spoke part positioned between the first spoke part and the third spoke part and having a plurality of second spokes arranged along a circumference of the outer band, and an impact frequency transmitted from the ground to the outer band. It may be dispersed by the first spoke portion, the second spoke portion and the third spoke portion.

In addition, the arrangement interval of the first spoke, the second spoke and the third spoke may be different.

In addition, the number of the first spokes, the second spokes and the third spokes may have a ratio of 1: 1.10 to 1.51: 1.20 to 1.80.

In addition, contact areas in which the first spoke, the second spoke and the third spoke contact the outer band may be different from each other.

In addition, a contact area where the first spokes contact the outer band may be different from a contact area where the second spokes contact the outer band.

In addition, materials of the first spoke part and the third spoke part may be different from each other.

In addition, the first spoke portion may have a different tensile force or compression force than the third spoke portion.

According to the embodiments of the present invention, the outer band may be formed asymmetrically along the longitudinal direction to form an excellent outer strength compared to the inner side of the outer band.

In addition, the outer band is divided into a plurality of regions along the longitudinal direction, and the frequency dispersion ratio is approximately 1: 1.10 to 1.51: 1.20 to 1.80 by varying the number of spokes connected to each region so that the outer band contacts the ground. Has the effect of improving the noise generated.

1 is a partial cross-sectional view of a non-pneumatic tire according to a first embodiment of the present invention.
2 is a view showing the spoke arrangement of the non-pneumatic tire shown in FIG.
3 is a view showing the spoke arrangement of the non-pneumatic tire according to the second embodiment of the present invention.
4 is a view showing the spoke arrangement of the non-pneumatic tire according to the third embodiment of the present invention.
5 is a view showing the spoke arrangement of the non-pneumatic tire according to the fourth embodiment of the present invention.

Hereinafter, based on the coordinate axis shown in FIG. 1, the x direction will be referred to as the width, the y direction to be referred to as the length, and the z direction to be increased. And it is called around the w direction shown in the outer band.

In addition, the same shape, area, arrangement and material of both sides with respect to the center line is called symmetry.

The non-pneumatic tire of the present invention includes an outer band, an inner band and spokes.

The spoke is a member connecting the outer band and the inner band. A plurality of spokes are arranged along the circumference of the outer band, and a plurality of spokes are also arranged in the width direction of the outer band.

Specifically, a plurality of first spokes are arranged on one side of the outer band to form the first spoke part, and a plurality of third spokes are arranged on the other side of the outer band to form the third spoke part.

The first spoke portion and the third spoke portion are asymmetrical to each other, characterized in that the strength of one side and the other side of the outer band is formed different from each other.

In general, when cornering, a lot of impact is applied to the outside compared to the inside of the tire. Therefore, if the tire is formed asymmetrically to make the strength of the outside of the tire stronger than the inside, the damage occurring to the outside of the tire when turning the corner is reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. Like parts are designated with like reference numerals throughout the specification.

1 is a partial cross-sectional view of a non-pneumatic tire according to a first embodiment of the present invention, Figure 2 is a view showing the spoke arrangement of the non-pneumatic tire according to the first embodiment of the present invention.

The non-pneumatic tire according to the first embodiment of the present invention includes an outer band, inner band and spokes.

The outer band 10 may be an annular band such as a carcass or inner ride which is disposed inside the tread or the tread contacting the ground when the vehicle is driven. Or it may be a body forming the overall skeleton of the tire in addition to the specified member.

The outer band 10 is generally made of rubber, but may alternatively be metal.

The inner band 20 is an annular frame located inside the outer band 10. The inner band 20 is a member forming a skeleton of a non-pneumatic tire like the outer band 10. The inner band 20 is generally made of metal to maintain the skeleton of the non-pneumatic tire, but may be made of rubber or the like as the outer band 10.

The spoke is a member connecting the outer band 10 and the inner band 20.

A plurality of spokes are arranged along the circumference of the outer band 10 to maintain the strength of the tire.

In addition, the spoke is arranged in plurality in the width direction of the outer band (10).

Specifically, a plurality of first spokes 311 are arranged on one side of the outer band 10, a plurality of third spokes 331 are arranged on the other side of the outer band 10, and the first spokes are arranged. A plurality of second spokes 321 are arranged along the circumference of the outer band 10 between the 311 and the third spoke 331.

Hereinafter, one side of the circumference of the outer band 10 to which the first spoke part 31 including the plurality of first spokes 311 is connected is referred to as a first connection part 11, and a plurality of second spokes 321. The other side circumference of the outer band 10 to which the second spoke part 32 including the second connection part 12 is called, and the third spoke part 33 including the plurality of third spokes 331 is provided. A portion of the outer band 10 that is connected is referred to as a third connecting portion 13.

As shown in FIG. 2, the first spoke 311 and the second spoke 321, the second spoke 321 and the third spoke 331 are not in contact with each other along the width direction of the outer band 10. . That is, the first spoke 311, the second spoke 321, and the third spoke 331 are arranged at different positions along the circumferential direction of the outer band 10.

Therefore, when the outer band 10 is in contact with the ground, the impact transmitted to the outer band 10 by friction between the outer band 10 and the ground is distributed in terms of frequency, so that the first spoke part 31 and the second spoke part ( 32) and the third spoke portion 33.

Unlike this, at least two of the first spoke 311, the second spoke 321, and the third spoke 331 may be in contact with each other along a circumference of the outer band 10. However, even in this case, since the first spoke 311 and the second spoke 321 or the second spoke 321 and the third spoke 331 are not connected to one spoke and each spoke is simply in contact with each other. The impact of the outer band 10 is distributed and transmitted to each spoke in terms of frequency.

On the other hand, although not necessarily, the plurality of first spokes 311, the second spokes 321 and the third spokes 331 are each formed to be different in the arrangement interval.

For example, the spacing of the second spokes 321 is wider than the spacing of the first spokes 311, and the spacing of the third spokes 331 is wider than the spacing of the second spokes 321.

That is, the arrangement between the spokes of the first spoke portion 31, the second spoke portion 32 and the third spoke portion 33 in the same space between the outer band 10 and the inner band 20 which is the same space. Since the spacing is different from each other, the number of the first spoke 311, the second spoke 321 and the third spoke 331 is different.

In this case, the dispersion efficiency of the frequencies transmitted to the first spoke part 31, the second spoke part 32, and the third spoke part 33 may be increased. In other words, since the arrangement intervals of the first spokes 311, the second spokes 321, and the third spokes 331 are different, and their numbers are different, the first spokes 31 and the second spokes ( 32) and the impact transmitted to the third spoke portion 33 is likely to be different in terms of frequency, respectively.

At this time, the number of the first spoke 311 of the first spoke portion 31, the number of the second spoke 321 of the second spoke portion 32 and the third spoke 331 of the third spoke portion 33 The spacing of the spokes can be adjusted so that the number of the ratios is 1: 1.10 to 1.51: 1.2 to 1.8, respectively.

In particular, when the ratio of the number of the first spoke 311, the second spoke 321 and the third spoke 331 is 1: 1.25: 1.5, frequency dispersion by the impact of the outer band 10 transmitted from the ground Rain is the ratio of the chord of any one of the chief chords, chord chords or accompanying chords.

The main chords, chordal chords and accompanying chords are the chords that make up the main triad. The main triad consists of the ratio of the frequencies of the notes that make up each chord. When several sounds occur together, when the ratio of the frequencies made by each sound is an integer ratio, people feel that the harmony generated by the sounds is beautiful.

Applying the theory of harmonics to the tire, if the outer band 10 is to disperse the frequency of the sound generated in contact with the ground so that the chord of the sound generated from the outer band 10 is one of the main three chords, The combination of sounds results in harmonious harmony. Therefore, there is an effect that the unpleasant noise generated by the outer band 10 in contact with the ground is improved.

In addition, since the number of each spoke constituting the first spoke portion 31 to the third spoke portion 33 is different, the rigidity is different along the width direction of the outer band (10).

When turning a corner, the vehicle is usually pulled to one side, so the outside of the tire has a greater amount of impact transmission than the inside. At this time, when the non-pneumatic tire is mounted on the vehicle with the third spoke portion 33 as the outside of the tire, the third spoke portion 33 is spoked in comparison with the first spoke portion 31 and the second spoke portion 32. Is closely arranged so that the strength of the third connector 13 is superior to that of the first connector 11 or the second connector 12, so that the damage of the third connector 13 is reduced.

On the other hand, in the ratio, when the ratio of the number of the second spokes 321 is less than 1.1 or the ratio of the number of the third spokes 331 is less than 1.2, the error of the frequency dispersion according to the error range of hearing and the state of the ground Even if it is considered, the chord generated by the frequency dispersion due to the friction between the outer band 10 and the ground does not correspond to any one of the main triads, and the strength of the non-pneumatic tire is weakened.

Even when the ratio of the number of the second spokes 321 exceeds 1.51 or the ratio of the number of the third spokes 331 exceeds 1.8, the frequency variance is not made to be an integer ratio so that the main triad is not generated. In addition, the ratio of the number of the first spokes 311 is lower than that of the third spokes 331, so that the strength of the first connector 11 is weakened.

In addition, in the above case, the second spokes 321 or the third spokes 331 are closely arranged, and when the outer band 10 is in contact with the ground, each spoke naturally bends and does not receive the impact of the tread. Each of the spokes hit each other first, there is a problem that the shock absorbing function of the spoke is reduced.

Meanwhile, areas where the first spoke 311, the second spoke 321, and the third spoke 331 contact the outer band 10 may be different from each other.

In particular, the area where the first spoke 311 contacts the outer band 10 may be wider than the area where the second spoke 321 and the third spoke 331 contact the outer band 10. In this case, although the number of the first spokes 311 is smaller than that of the second spokes 321 and the third spokes 331, the contact area of each first spoke 311 is in contact with the outer band 10 is wide. The strength of the first connecting portion 11 is excellent. At the same time, the number of the first spokes 311, the second spokes 321 and the third spokes 331 is maintained at the above ratio, so that one of the harmonic triads is generated, thereby improving the problems of strength and noise.

For example, as shown in FIG. 2, the lengths y1 (y2) (y3) of the first connecting portion 11, the second connecting portion 12, and the third connecting portion 13 are formed to be substantially the same, and the first The spokes 311 to the third spokes 331 have the same length and the widths x1, x2, and x3 are different from each other, so that each spoke part contacts each connection part 11, 12, 13, respectively. The area to be formed may be different.

Therefore, even if the number of the first spokes 311 connected to the first connecting portion 11 is smaller than the number of the third spokes 331 connected to the third connecting portion 13, the first connecting portion 11 and Since the contact area of the first spoke part 31 is wide, the strength of the first connector 11 may be maintained.

On the other hand, as shown in Figure 1, the first spoke portion 31, the second spoke portion 32 and the third spoke portion 33 may be formed of a plurality of layers, respectively. That is, the intermediate band 40 may be disposed between the outer band 10 and the inner band 20.

The intermediate band 40 is an annular band like the outer band 10 or the inner band 20.

The intermediate band 40 serves to support each spoke between the inner band 20 and the outer band 10. Specifically, the intermediate band 40 is disposed between the outer band 10 and the inner band 20 compared to the height of each spoke when the spokes are arranged in a single layer between the outer band 10 and the inner band 20. If present, the height of each spoke can be lowered by half.

In this case, since the height of the spokes is low, when the spokes are bent when the shock is transmitted from the outer band 10, the degree of bending is small, thereby reducing the risk of the spokes being broken.

Although only one intermediate band 40 is shown in FIG. 1, the number of the intermediate bands 40 may be provided in plurality depending on the material and size of the non-pneumatic tire.

3 illustrates a non-pneumatic tire according to a second embodiment of the present invention. The non-pneumatic tire according to the second embodiment includes an outer band, an inner band and spokes. Since the outer band, the inner band and the spokes have the same configuration and function as the outer band, the inner band and the spokes of the first embodiment described above, redundant descriptions thereof will be omitted.

In the above-described case, the first spokes 31 to 3rd spokes 33 constitute the first spokes 31 to 3, so that the arrangement intervals of the first spokes 311, the second spokes 321, and the third spokes 331 are different. The number of spokes 311, second spokes 321, and third spokes 331 are formed to be different from each other.

In addition, the first spoke part 31, the second spoke part 32 and the third spoke part 33 are in contact with the first connecting part 11, the second connecting part 12, and the third connecting part 13. The area is formed differently.

Specifically, the widths x1, x2, and x3 of the first spoke 311, the second spoke 321, and the third spoke 331 are the same, but the first connection part 11 and the second connection part 12 are the same. ) And the lengths y1 (y2) and y3 of the third connecting portion 13 are different, and the lengths of the first spokes 311 to the third spokes 331 are different from each other. Also in this case, the areas where the first spokes 311 to the third spokes 331 contact the first connecting parts 11 to the third connecting parts 13 are different.

That is, the ratio of the number of the first spokes 311 to the third spokes 331 is maintained as in the first embodiment described above, but the strength of the non-pneumatic tire is changed by varying the area in contact with the outer band 10. It can be formed asymmetrically.

Therefore, even if the number of the first spokes 311 connected to the first connector 11 is less than the number of the third spokes 331 connected to the third connector 13, the first spokes 31 Since the contact area between the first connection part 11 and the first contact part 11 is larger than the contact area between the third spoke part 33 and the third connection part 13, the strength of the first connection part 11 may be maintained.

In addition, since the ratio of the number of the first, second, and third spokes 311, 321, and 331 is approximately maintained at a ratio of 1: 1.10 to 1.51: 1.20 to 1.80, the impact received from the outer band 10 is reduced. Distributed in terms of frequency, one of the harmonic triads can be generated from a non-pneumatic tire. Thus, noise generated from non-pneumatic tires can be improved.

On the other hand, Figure 4 shows a non-pneumatic tire according to a third embodiment of the present invention.

The non-pneumatic tire according to the third embodiment includes an outer band, an inner band and spokes. Since the outer band, the inner band and the spokes have the same configuration and function as the outer band, the inner band and the spokes of the first embodiment described above, redundant descriptions thereof will be omitted.

The number of the first spokes 311 to the third spokes 331 is equally connected to the first connecting parts 11 to the third connecting parts 13 of the outer band 10 according to the third exemplary embodiment. That is, since the arrangement intervals of the first spokes 311, the second spokes 321, and the third spokes 331 are substantially equal to each other, the first spokes 311 and the second spoke portions of the first spoke portion 31 are the same. The ratio of the number of the second spokes 321 and the third spoke portions of the third spoke portion 33 to 32 is approximately 1: 1: 1.

In addition, the outer band 10 is divided into three regions almost equally along the longitudinal direction, and the areas of the first connecting portion 11 to the third connecting portion 13 are formed to be substantially the same.

However, each of the first spokes 311 to third spokes 331 has a different contact area in contact with the outer band 10. Specifically, the width x1 of the first spoke 311, the width x2 of the second spoke 321, and the width x3 of the third spoke 331 are different from each other.

At this time, the width (x3) of the third spoke 331 forming the outside of the non-pneumatic tire is formed thicker than the width (x1) of the first spoke 311 and the width (x2) of the second spoke (321) The strength of the third connector 13 to which the third spoke 331 is connected is improved compared to the first connector 11.

Therefore, the impact amount transmitted from the ground to the first connecting portion 11, the second connecting portion 12 and the third connecting portion 13 when the corner is different from each other to the third connecting portion 13 compared to the first connecting portion 11; Even if a large shock is transmitted, the strength of the third connection part 13 connected to the third spoke part 33 is strong, so that the degree of damage to the tire is weakened.

On the other hand, Figure 5 shows a non-pneumatic tire according to a fourth embodiment of the present invention.

The non-pneumatic tire according to the fourth embodiment includes an outer band, an inner band and spokes. Since the outer band, the inner band and the spokes have the same configuration and function as the outer band, the inner band and the spokes of the first embodiment described above, redundant descriptions thereof will be omitted.

The number of the first spokes 311 to the third spokes 331 is equally connected to the first connecting parts 11 to the third connecting parts 13 of the outer band 10 according to the fourth embodiment. That is, since the arrangement intervals of the first spokes 311, the second spokes 321, and the third spokes 331 are substantially equal to each other, the first spokes 311 and the second spoke portions of the first spoke portion 31 are the same. The ratio of the number of the second spokes 321 and the third spoke portions of the third spoke portion 33 to 32 is approximately 1: 1: 1.

At this time, the first connecting portion 11, the second connecting portion 12 and the third connecting portion 13 are formed with different areas, respectively. Specifically, the lengths y1 (y2) and y3 of the first connector 11, the second connector 12, and the third connector 13 are formed differently.

Accordingly, the first spokes 311, the second spokes 321, and the third spokes 331 connected to each connection part are also formed to have different lengths. However, in order to maintain the strength of the outer band 10, the widths x1, x2, and x3 of the first spokes 311, the second spokes 321, and the third spokes 331 are the same.

That is, unlike the third embodiment in which the spokes have the same length but different widths, the strength of the first connecting portion 11, the second connecting portion 12, and the third connecting portion 13 is asymmetrically formed. In the example, the widths of the spokes are formed to be the same, and the contact area between the spokes and the outer bands is different from each other so that the strength of the first connecting portion 11, the second connecting portion 12, and the third connecting portion 13 is increased. Formed asymmetrically.

In this case, the contact area where the third spoke 331 forming the outside of the non-pneumatic tire contacts the outer band 10 is the contact where the first spoke 311 and the second spoke 321 contact the outer band 10. Formed wider than the area, the strength of the third connecting portion 13 to which the third spoke 331 is connected is improved compared to the first connecting portion 11 or the second connecting portion 12.

Therefore, the impact amount transmitted from the ground to the first connecting portion 11, the second connecting portion 12 and the third connecting portion 13 when the corner is different from each other to the third connecting portion 13 compared to the first connecting portion 11; Even if a large shock is transmitted, the strength of the third connection part 13 connected to the third spoke part 33 is strong, so that the degree of damage to the tire is weakened.

Alternatively, each of the first spokes 311, the second spokes 321, and the third spokes 331 maintains the same contact area and the number of contact with the outer band 10, but differs in materials of the first spokes, respectively. The three spokes 31, 32 and 33 can be formed asymmetrically.

That is, the third spokes 331 are formed of a material having a stronger strength than the first spokes 311 and the second spokes 321 so that the strength of the third connecting portion 13 is increased by the first connecting portion 11 and the second connecting portion. It can form more strongly compared with (12).

In particular, the third spoke 331 may be formed of a material having a higher tensile or compressive force than the first spoke 311 and the second spoke 321. In this case, the third connecting portion 13 has stronger tensile or compressive force than the first connecting portion 11 and the second connecting portion 12. Therefore, even if the impact amount transmitted from the ground to the outer band 10 is different in the longitudinal direction of the outer band 10, even if a strong impact amount is transmitted to the third connector 13 compared to the first connector 11, the third connector 13 ), The degree of damage may not be greater than that of the first connector 11 or the second connector 12.

In the above description, the outer band 10 is divided into three regions along the longitudinal direction, but the outer band 10 may be divided into two or four regions along the length direction according to the size of the outer band 10. Can be partitioned.

In particular, when arranging the spokes by dividing the outer band 10 into four or more regions along the longitudinal direction, the outer band 10 is lengthened such that the impact transmitted to the outer band 10 is approximately an integer ratio in terms of frequency. The noise can be improved by varying the intensity along the direction and by generating a harmonic triad as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And falls within the scope of the invention.

10: outer band 11: the first connection portion
12: second connection portion 13: third connection portion
20: inner band
31: first spoke part 311: first spoke
32: second spoke portion 321: second spoke
33: third spoke portion 331: third spoke
40: middle band

Claims (8)

In a non-pneumatic tire in which a plurality of spokes are arranged along the circumference of the outer band,
A first spoke part having a plurality of first spokes arranged on one side of the outer band;
A third spoke portion having a plurality of third spokes arranged on the other side of the outer band and asymmetrically formed with the first spoke portion, and
A second spoke part disposed between the first spoke part and the third spoke part and having a plurality of second spokes arranged along a circumference of the outer band;
The impact frequency transmitted from the ground to the outer band is dispersed by the first spoke portion, the second spoke portion and the third spoke portion.
The chords, substrings and accompanying chords,
The number of the first spoke, the second spoke and the third spoke has a ratio of 1: 1.10 to 1.51: 1.20 to 1.80,
The non-pneumatic tire, wherein the first spoke, the second spoke and the third spoke are separated from each other. delete In claim 1,
The non-pneumatic tire, wherein the arrangement spacing of the first spokes, the arrangement spacing of the second spokes, and the arrangement spacing of the third spokes are respectively different. delete In claim 1,
And a non-pneumatic tire having a different contact area between the first spoke, the second spoke, and the third spoke in contact with the outer band. In claim 1,
A non-pneumatic tire, wherein the contact area where the first spokes contact the outer band is different from the contact area where the third spokes contact the outer band. In claim 1,
A non-pneumatic tire having different materials from the first spoke portion and the third spoke portion. In claim 1,
And the first spoke portion is a non-pneumatic tire having a different tensile force or compression force from the third spoke portion.

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