Pneumatic tire with reinforcing part

There is provided a pneumatic tire with a reinforcing part which is mounted on a tire wheel, the pneumatic tire including: a tread having a groove that is formed in a circumferential direction of the tire wheel as being recessed toward a central axis of the tire wheel, a kerf that is formed to intersect the groove as being recessed toward the central axis of the tire wheel, and one or more blocks that are formed between the groove and the kerf and come into contact with a road surface; a shoulder formed at a side of the tread; and a reinforcing part inserted into the groove formed between the one or more blocks. The reinforcing part reduces noise produced due to contact with the road surface by being bent one or more times.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a pneumatic tire with a reinforcing part, and more specifically, to a pneumatic tire with a reinforcing part in which the reinforcing part is inserted into a groove to reduce noise.

Description of the Related Art

In general, when a vehicle runs, a channel formed by a main groove inFIG.1causes a straight pipe-shaped air column having a uniform cross section to be formed, and thus pipe resonance occurs, resulting in a phenomenon of tire noise amplification.

FIG.1illustrates flow of hydroplaning due to running of the vehicle. As illustrated inFIG.1, in a rainy weather, as a tread comes into contact with a road surface with rotation of a tire, water flows along a groove, and thus the groove has a function of preventing a slipping phenomenon on a road.

In this case, the pipe resonance constantly amplifies tire noise during running not only at a normal speed of 60 kph to 80 kph in the downtown area but also in a speed range of 100 kph to 130 kph on an expressway.

Examples of an existing technology to solve the pipe resonance phenomenon include methods of using a Helmholtz resonator or engraving a knurling shape additionally on a wall surface of a groove.

However, the Helmholtz resonator has design difficulties in accurately calculating and adding a cavity shape having a specific volume within a pattern.

However, since a knurling shape is engraved by performing accurate processing of a fine line shape on a wall surface of a groove, difficulty in a mold manufacturing process increases.

Hence, there is a demand for a technology for reducing tire noise, instead of methods of using the Helmholtz resonator or engraving a knurling shape in the related art.

CITATION LIST

Patent Literature

SUMMARY OF THE INVENTION

An object of the present invention to solve the above-described problems is to provide a pneumatic tire with a reinforcing part in which the reinforcing part bent one or more times is inserted into a groove formed between one or more blocks to realize a pipeline structure that brings about an expansion chamber effect in the groove, thereby reducing noise due to contact with a road surface.

Technical objects to be achieved by the present invention are not limited to the technical object mentioned above, and the following description enables other unmentioned technical objects to be clearly understood by a person of ordinary skill in the art to which the present invention pertains.

According to a configuration of the present invention to achieve the above-described object, there is provided a pneumatic tire with a reinforcing part which is mounted on a tire wheel, the pneumatic tire including: a tread having a groove that is formed in a circumferential direction of the tire wheel as being recessed toward a central axis of the tire wheel, a kerf that is formed to intersect the groove as being recessed toward the central axis of the tire wheel, and one or more blocks that are formed between the groove and the kerf and come into contact with a road surface; a shoulder formed at a side of the tread; and a reinforcing part inserted into the groove formed between the one or more blocks. The reinforcing part reduces noise produced due to contact with the road surface by being bent one or more times.

According to an embodiment of the present invention, the reinforcing part may have a thickness of 2 mm to 3 mm.

According to the embodiment of the present invention, the reinforcing part may have an SS rib, an M rib, an LL rib, an S rib, and an L rib which are each extended by a predetermined length in opposite directions from both ends of a right-angled ‘C’ shape, and the SS rib, the M rib, the LL rib, the S rib, and the L rib may be different from each other in size and are connected to each other in series.

According to the embodiment of the present invention, the SS rib, the M rib, the LL rib, the S rib, and the L rib may alternately project to be opposite to each other with a central axis as a reference.

According to the embodiment of the present invention, the SS rib may have: a first SS rib which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once; a second SS rib which is extended from one end of the first SS rib and is parallel to the central axis; and a third SS rib which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to one end of the second SS rib. The first SS rib and the third SS rib may have the same shape, and at least the one portion of the first SS rib and at least the one portion of the third SS rib may be extended outward to be opposite to each other.

According to the embodiment of the present invention, the M rib may have: a first M rib which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once; a second M rib which is extended from one end of the first M rib and is parallel to the central axis; and a third M rib which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to one end of the second M rib. The first M rib and the third M rib may have the same shape, and at least the one portion of the first M rib and at least the one portion of the third M rib may be extended outward to be opposite to each other.

According to the embodiment of the present invention, the LL rib may have: a first LL rib which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once; a second LL rib which is extended from one end of the first LL rib and is parallel to the central axis; and a third LL rib which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to one end of the second LL rib. The first LL rib and the third LL rib may have the same shape, and at least the one portion of the first LL rib and at least the one portion of the third LL rib may be extended outward to be opposite to each other.

According to the embodiment of the present invention, the S rib may have: a first S rib which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once; a second S rib which is extended from one end of the first S rib and is parallel to the central axis; and a third S rib which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to one end of the second S rib. The first S rib and the third S rib may have the same shape, and at least the one portion of the first S rib and at least the one portion of the third S rib may be extended outward to be opposite to each other.

According to the embodiment of the present invention, the L rib may have: a first L rib which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once; a second L rib which is extended from one end of the first L rib and is parallel to the central axis; and a third L rib which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to one end of the second L rib. The first L rib and the third L rib may have the same shape, and at least the one portion of the first L rib and at least the one portion of the third L rib may be extended outward to be opposite to each other.

According to the embodiment of the present invention, a pitch length (Lp) representing the shortest distance between both ends of the SS rib may be 25 mm, a width (W) representing a length perpendicular to at least the one portion of the SS rib may be 2 mm, and a ratio (H/Lp) obtained by dividing a length (H) of the second SS rib by the pitch length (Lp) may be 58%.

According to the embodiment of the present invention, a pitch length (Lp) representing the shortest distance between both ends of the M rib may be 31.825 mm, a width (W) representing a length perpendicular to at least the one portion of the M rib may be 3 mm, and a ratio (H/Lp) obtained by dividing a length (H) of the second M rib by the pitch length (Lp) may be 54%.

According to the embodiment of the present invention, a pitch length (Lp) representing the shortest distance between both ends of the LL rib may be 40.5 mm, a width (W) representing a length perpendicular to at least the one portion of the LL rib may be 4 mm, and a ratio (H/Lp) obtained by dividing a length (H) of the second LL rib by the pitch length (Lp) may be 50%.

According to the embodiment of the present invention, a pitch length (Lp) representing the shortest distance between both ends of the S rib may be 28.25 mm, a width (W) representing a length perpendicular to at least the one portion of the S rib may be 2 mm, and a ratio (H/Lp) obtained by dividing a length (H) of the second S rib by the pitch length (Lp) may be 56%.

According to the embodiment of the present invention, a pitch length (Lp) representing the shortest distance between both ends of the L rib may be 35.925 mm, a width (W) representing a length perpendicular to at least the one portion of the L rib may be 3 mm, and a ratio (H/Lp) obtained by dividing a length (H) of the second L rib by the pitch length (Lp) may be 52%.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, the present invention is to be described with reference to the accompanying drawings. However, the present invention can be realized as various different examples and thus is not limited to embodiments described here. Besides, a part unrelated to the description is omitted from the drawings in order to clearly describe the present invention, and similar reference signs are assigned to similar parts through the entire specification.

In the entire specification, a case where a certain part is “connected to (attached to, in contact with, or coupled to)” another part means not only a case where the parts are “directly connected” to each other, but also a case where the parts are “indirectly connected” to each other with still another member interposed therebetween. In addition, a case where a certain part “comprises” a certain configurational element does not mean that another configurational element is excluded but means that the other configurational element can be further included, unless specifically described otherwise.

Terms used in this specification are only used to describe a specific embodiment and are not intentionally used to limit the present invention thereto. A singular form of a word also includes a plural meaning of the word, unless obviously implied otherwise in context. In this specification, words such as “to comprise” or “to include” are understood to specify that a feature, a number, a step, an operation, a configurational element, a member, or a combination thereof described in the specification is present and not to exclude presence or a possibility of addition of one or more other features, numbers, steps, operations, configurational elements, members, or combinations thereof in advance.

FIG.2is a perspective view in one direction illustrating a pneumatic tire with a reinforcing part according to an embodiment of the present invention.

A tire wheel10, on which a pneumatic tire100with a reinforcing part is mounted, is first described, before description of the pneumatic tire100with a reinforcing part according to the embodiment of the present invention.

With reference toFIG.2, the tire wheel10is an apparatus on which the pneumatic tire100with a reinforcing part is mounted and includes a rim11, a disc12, and a spoke13.

Desirably, the rim11has a cylindrical shape with both sides opened and is made of a material having a predetermined strength so as to support a load of a vehicle. One or more spokes13are coupled to an inner surface of the rim11to be separated by a predetermined distance from the inner surface.

Desirably, the disc12is positioned at a central portion within the rim11and is made of a material having a predetermined strength so as to support a load of a vehicle. One or more spokes13are coupled to an outer surface of the disc12to be separated by a predetermined distance from the outer surface.

The spoke13is a configurational element which connects the rim11and the disc12, and one or more spokes are configured to be made of a material having a predetermined strength, thereby transmitting a load of a vehicle to the disc12.

Hereinafter, the pneumatic tire100with a reinforcing part according to the embodiment of the present invention is to be described with reference toFIGS.2to8.

According to the pneumatic tire with a reinforcing part which is mounted on a tire wheel, the pneumatic tire100with a reinforcing part according to the embodiment of the present invention includes a tread110, a shoulder120, and a reinforcing part130.

The tread110includes a groove111, a kerf112, and a block113.

A groove111is formed in a circumferential direction of the tire wheel10as being recessed toward a central axis of the tire wheel10. InFIG.2, two grooves111are illustrated; however, the number of grooves is not limited thereto.

The groove111fulfills a function of effectively draining water flowing into the groove in a rainy weather while a vehicle runs on a road.

The kerf112is a groove formed to intersect the groove111as being recessed toward the central axis of the tire wheel10. InFIG.2, 36 kerfs112are illustrated; however, the number of kerfs is not limited thereto.

The reinforcing part130is inserted into the kerf112.

The block113includes one or more blocks that are formed between the grooves111and the kerfs112and that come into contact with a road surface.

Here, the one or more blocks113means first blocks113a, second blocks113b, and third blocks113c. In the present invention, the first blocks113aare blocks positioned in the leftmost row inFIG.2, the second blocks113bare blocks positioned in the middle row inFIG.2, and the third blocks113care blocks positioned in the rightmost row inFIG.2.

InFIG.2, the one or more blocks113are illustrated as 39 blocks; however, the number of blocks is not limited thereto.

The shoulder120is formed at a side of the tread110and comes into close contact with the rim11, thereby fixing the tread110to the rim11.

The reinforcing part130is inserted into the groove111formed between the one or more blocks113. In this manner, the reinforcing part130is bent one or more times, thereby reducing noise produced due to contact with a road surface.

FIG.3is a partially enlarged view illustrating details of region S inFIG.2.FIG.4is a plan view in one direction illustrating the reinforcing part inFIG.3.

With reference toFIGS.3and4, the reinforcing part130can be bent eight times, but can be bent more times or less times as necessary.

In addition, the reinforcing part130has a thickness of 2 mm to 3 mm, desirably.

The reinforcing part130has an SS rib131, an M rib132, an LL rib133, an S rib134, and an L rib135which are each extended by a predetermined length in opposite directions from both ends of a right-angled ‘C’ shape.

In addition, the SS rib131, the M rib132, the LL rib133, the S rib134, and the L rib135are different from each other in size and are connected to each other in series.

In addition, the SS rib131, the M rib132, the LL rib133, the S rib134, and the L rib135alternately project to be opposite to each other with a central axis as a reference.

The SS rib131has a first SS rib131a, a second SS rib131b, and a third SS rib131c.

With reference toFIG.4, the first SS rib131ahas a plate shape which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once. Here, the central axis is a dash-dotted line formed in a vertical direction.

Specifically, the first SS rib131ais an ‘L’-shaped plate member, and one end of one portion perpendicular to at least the one portion of the first SS rib131ais perpendicularly connected to the second SS rib131b.

The second SS rib131bis a plate member which is extended from the one end of the first SS rib131aand is parallel to the central axis. In addition, the second SS rib131bis positioned to project toward a right-hand side with the central axis as a reference.

In addition, one end of the second SS rib131bis connected to the third SS rib131c.

The third SS rib131chas a plate shape which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to the one end of the second SS rib131b.

In this case, the first SS rib131aand the third SS rib131chave the same shape and are positioned to be opposite to each other.

More specifically, at least the one portion of the first SS rib131aand at least the one portion of the third SS rib131care extended outward to be opposite to each other.

That is, with reference toFIG.4, at least the one portion of the first SS rib131ais positioned to be extended upward, and at least the one portion of the third SS rib131cis positioned to be extended downward.

The M rib132has a first M rib132a, a second M rib132b, and a third M rib132c.

The first M rib132ahas a plate shape which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once.

Specifically, the first M rib132ais an ‘L’-shaped plate member, and one end of one portion perpendicular to at least the one portion of the first M rib132ais perpendicularly connected to the second M rib132b.

The second M rib132bis a plate member which is extended from the one end of the first M rib132aand is parallel to the central axis. In addition, the second M rib132bis positioned to project toward a left-hand side with the central axis as a reference.

In addition, one end of the second M rib132bis connected to the third M rib132c.

The third M rib132cis a plate member which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to the one end of the second M rib132b.

In this case, the first M rib132aand the third M rib132chave the same shape and are positioned to be opposite to each other.

More specifically, at least the one portion of the first M rib132aand at least the one portion of the third M rib132care extended outward to be opposite to each other.

That is, with reference toFIG.4, at least the one portion of the first M rib132ais positioned to be extended upward, and at least the one portion of the third M rib132cis positioned to be extended downward.

The LL rib133has a first LL rib133a, a second LL rib133b, and a third LL rib133c.

The first LL rib133ahas a plate shape which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once.

Specifically, the first LL rib133ais an ‘L’-shaped plate member, and one end of one portion perpendicular to at least the one portion of the first LL rib133ais perpendicularly connected to the second LL rib133b.

The second LL rib133bis a plate member which is extended from the one end of the first LL rib133aand is parallel to the central axis. In addition, the second LL rib133bis positioned to project toward the right-hand side with the central axis as a reference.

In addition, one end of the second LL rib133bis connected to the third LL rib133c.

The third LL rib133cis a plate member which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to the one end of the second LL rib133b.

In addition, the first LL rib133aand the third LL rib133chave the same shape and are positioned to be opposite to each other.

More specifically, at least the one portion of the first LL rib133aand at least the one portion of the third LL rib133care extended outward to be opposite to each other.

That is, with reference toFIG.4, at least the one portion of the first LL rib133ais positioned to be extended upward, and at least the one portion of the third LL rib133cis positioned to be extended downward.

The S rib134has a first S rib134a, a second S rib134b, and a third S rib134c.

The first S rib134ahas a plate shape which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once.

The second S rib134bis a plate member which is extended from one end of the first S rib134aand is parallel to the central axis. In addition, the second S rib134bis positioned to project toward the left-hand side with the central axis as a reference.

In addition, one end of the second S rib134bis connected to the third S rib134c.

The third S rib134cis a plate member which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to the one end of the second S rib134b.

In addition, the first S rib134aand the third S rib134chave the same shape and are positioned to be opposite to each other.

More specifically, at least the one portion of the first S rib134aand at least the one portion of the third S rib134care extended outward to be opposite to each other.

That is, with reference toFIG.4, at least the one portion of the first S rib134ais positioned to be extended upward, and at least the one portion of the third S rib134cis positioned to be extended downward.

The L rib135has a first L rib135a, a second L rib135b, and a third L rib135c.

The first L rib135ahas a plate shape which has at least one portion positioned on the same straight line as the central axis and is bent at an angle of 90° once.

The second L rib135bis a plate member which is extended from one end of the first L rib135aand is parallel to the central axis. In addition, the second L rib135bis positioned to project toward the left-hand side with the central axis as a reference.

In addition, one end of the second L rib135bis connected to the third L rib135c, but the second L rib and the third L rib are positioned to be opposite to each other.

More specifically, at least the one portion of the first L rib135aand at least the one portion of the third L rib135care extended outward to be opposite to each other.

That is, with reference toFIG.4, at least the one portion of the first L rib135ais positioned to be extended upward, and at least the one portion of the third L rib135cis positioned to be extended downward.

The third L rib135cis a plate member which has at least one portion positioned on the same straight line as the central axis, is bent at an angle of 90° once, and is connected to the one end of the second L rib135b.

In this case, the first L rib135aand the third L rib135chave the same shape, and at least the one portion of the first L rib135aand at least the one portion of the third L rib135care extended outward to be opposite to each other.

The above-described reinforcing part130is inserted in the groove111, thereby bringing about an expansion chamber effect.

In this case, a height H of the reinforcing part130illustrated inFIG.4is designed to be equal to a depth of the groove111. In addition, the reinforcing part130has a shape designed by determining sizes of H and W for each step as illustrated inFIG.4.

In this manner, the reinforcing part130brings about an expansion chamber effect of a discontinuous change in cross section within the groove111. The expansion chamber effect enables the reinforcing part130to function as a noise reducing element which inhibits noise in a footprint from being propagated outside.

The discontinuous change in cross-sectional area inhibits an air column having a uniform cross section from being formed at the tread during rotation of a tire and prevents an occurrence of pipe resonance due to the air column.

In addition, addition of the reinforcing part130causes a ground contact ratio with a road surface and a hydroplaning breakage characteristic to be increased. Hence, degradation of hydroplaning characteristics due to a decrease in effective cross-sectional area of a channel of the groove111is compensated.

Hence, when the reinforcing part130is applied to a snow tire, an effective edge line which comes into contact with a ground surface is increased, and thus performance of a snow tractive force or snow traction is increased.

In this respect, the reinforcing part130can be designed to have a width W and a height H which vary depending on a pattern, that is, the first, second, and third blocks (113a,113b, and113c) of a tire, and details thereof are provided in Tables 1 and 2.

In Table 1, when three blocks illustrated inFIG.4are formed (three pitches), a width W and a ratio (H/Lp) of a height H to a pitch length Lp of the reinforcing part130are provided, and the width W is described to be minus (−) when being present at the left-hand side and plus (+) when being present at the right-hand side, based on at least the one portion of at least the one portion of the first M rib132a, at least the one portion of the third M rib132c, at least the one portion of the first S rib134a, at least the one portion of the third S rib134c, at least the one portion of the first L rib135a, at least the one portion of the third L rib135cwhich are illustrated inFIG.4.

In Table 2, when five blocks are formed (five pitches), a width W and a ratio (H/Lp) of a height H to a pitch length Lp of the reinforcing part130are provided, and the width W is described to be minus (−) when being present at the left-hand side and plus (+) when being present at the right-hand side, based on at least the one portion of the first SS rib131a, at least the one portion of the third SS rib131c, at least the one portion of the first M rib132a, at least the one portion of the third M rib132c, at least the one portion of the first LL rib133a, at least the one portion of the third LL rib133c, at least the one portion of the first S rib134a, at least the one portion of the third S rib134c, at least the one portion of the first L rib135a, at least the one portion of the third L rib135cwhich are illustrated inFIG.4. First, a pitch length Lp representing the shortest distance between both ends of the SS rib131is 25 mm, a width W representing a length perpendicular to at least the one portion of the SS rib131is 2 mm, and a ratio (H/Lp) obtained by dividing a length H of the second SS rib131bby the pitch length Lp is 58%.

Next, a pitch length Lp representing the shortest distance between both ends of the M rib132is 31.825 mm, a width W representing a length perpendicular to at least the one portion of the M rib132is 3 mm, and a ratio (H/Lp) obtained by dividing a length H of the second M rib132bby the pitch length Lp is 54%.

Next, a pitch length Lp representing the shortest distance between both ends of the LL rib133is 40.5 mm, a width W representing a length perpendicular to at least the one portion of the LL rib133is 4 mm, and a ratio (H/Lp) obtained by dividing a length H of the second LL rib133bby the pitch length Lp is 50%.

Next, a pitch length Lp representing the shortest distance between both ends of the S rib134is 28.25 mm, a width W representing a length perpendicular to at least the one portion of the S rib134is 2 mm, and a ratio (H/Lp) obtained by dividing a length H of the second S rib134bby the pitch length Lp is 56%.

Lastly, a pitch length Lp representing the shortest distance between both ends of the L rib135is 35.925 mm, a width W representing a length perpendicular to at least the one portion of the L rib135is 3 mm, and a ratio (H/Lp) obtained by dividing a length H of the second L rib135bby the pitch length Lp is 52%.

In this case, a height of the reinforcing part130is designed to reach 90% of a depth of the groove111.

In addition, the reinforcing part130has a shape designed by determining the width W and the length H for each pitch as illustrated inFIG.4and Tables 1 and 2.

The reinforcing part130disposed in a perimeter direction which is a circumferential direction of the tire wheel10is designed for each pitch of a pitch sequence of a tire pattern and minimizes the occurrence of noise due to the reinforcing part130. As a result, the number of steps of length change of the reinforcing part130in the perimeter direction is equal to the number of pattern pitches.

In addition, a size of W representing a change in length in a lateral direction of a tire is determined not to exceed 25% of the groove111as a maximum value W, regarding a relative priority between hydroplaning performance and noise performance.

FIGS.5A and5Bare partial-perspective views illustrating an actually manufactured pneumatic tire with a reinforcing part according to the embodiment of the present invention and illustrate a manufactured carving tire.

FIG.5Aillustrates a carving tire, andFIG.5Billustrates the carving tire inFIG.5Awith a reinforcing part. In this case, the carving tire is a tire manufactured according to the present invention.

In this case, a width W of the groove111is 15 mm, a depth of the groove111is 7 mm, a thickness of the reinforcing part130is 2 mm to 3 mm.

FIG.6is a graph of an experiment illustrating noise depending on a speed of the pneumatic tire with a reinforcing part according to the embodiment of the present invention and the related art in an anechoic chamber, and the graph illustrates a result obtained by the carving tire with a reinforcing part illustrated inFIG.5B.

In this case, the groove111of the present invention is a silent rib groove, and the groove in the related art is a smooth groove.

FIG.6enables to check that less noise is produced by the groove111of the present invention than by the groove in the related art at a speed in an entire zone in which the tire rotates. Hence, the present invention can be accepted to be effective in reducing noise.

FIG.7is a graph of an experiment illustrating noise depending on an octave of the pneumatic tire with a reinforcing part according to the embodiment of the present invention and the related art in an anechoic chamber (60 kph), and the graph illustrates a result obtained by the carving tire with a reinforcing part illustrated inFIG.5A. The experiment is conducted under a condition in which cruising is performed at a speed of 60 kps in the anechoic chamber.

FIG.7enables to check that less noise is produced by the groove111of the present invention than by the groove in the related art in most of an entire zone of one third of an octave.

FIG.8is a graph of an experiment illustrating noise depending on an octave of the pneumatic tire with a reinforcing part according to the embodiment of the present invention and the related art, in an anechoic chamber (80 kph). The experiment is conducted under a condition in which cruising is performed at a speed of 80 kps in the anechoic chamber.

Similarly toFIG.7,FIG.8enables to check that less noise is produced by the groove111of the present invention than by the groove in the related art, in most of the entire zone of one third of an octave.

Effects of the present invention according to the above-described configuration include not only a reduction in noise produced due to contact with a road surface but also prevention of an air column phenomenon by inserting a reinforcing part which is bent one or more times into a groove formed between one or more blocks and by realizing a pipeline structure that brings about an expansion chamber effect in the groove.

In addition, another effect of the present invention according to the above-described configuration include compensation for a degradation phenomenon of hydroplaning characteristics due to a decrease in effective cross-sectional area of a groove channel as a ground contact ratio and a hydroplaning breakage characteristic are increased due to addition of a reinforcing part.

Effects of the present invention are to be construed not to be limited to the above-described effects but to include any effect that can be derived from configurations of the present invention described in the detailed description of the preferred embodiment and claims of the present invention.

The description of the present invention described above is provided as an example, and a person of ordinary skill in the art to which the present invention pertains can understand that it is possible to easily modify the present invention to another embodiment without changing the technical idea or essential feature of the present invention. Therefore, the embodiments described above are to be understood only as examples in every aspect and not as examples limiting the present invention. For example, the configurational elements described in a singular form can be realized in a distributed manner. Similarly, the configurational elements described in a distributed manner can be realized in a combined manner.

The scope of the present invention has to be represented by the claims to be described below, and meaning and the scope of the claims and every modification or modified embodiment derived from an equivalent concept of the claims have to be construed to be included in the scope of the present invention.

While the present invention has been described with respect to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined in the following claims.