KR102374571B1 - Pneumatic tire - Google Patents

Abstract

The pneumatic tire according to the embodiment of the present invention has a tread portion in contact with a road surface, a shoulder portion formed in the width direction on both sides of the tire around the tread portion, and at least one of a surface of the tread portion and a surface of the shoulder portion to be drawn inward. a groove formed in a depression, wherein the groove includes a side surface concave from any one of a tread surface and a surface of the shoulder portion, a bottom surface forming a boundary with the side surface and parallel to any one of the tread surface and the surface of the shoulder portion And, a plurality of nano-protrusions may be formed only on the bottom surface.

Description

pneumatic tire {PNEUMATIC TIRE}

The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire capable of efficiently discharging water from a groove.

Tires are installed in a variety of vehicles, from small vehicles to heavy-duty vehicles, to support the vehicle's load, and have a power transmission and braking function that transmits the vehicle's power to the ground, and cushions vibrations and shocks from the ground generated during vehicle driving. perform the function Tires, which play an important part in driving and braking of such vehicles, were equipped with internal air pressure to perform the functions of the tires.

In addition, the tire may include a tread portion in contact with the road surface, and a groove may be formed in the tread portion. One of the roles of the groove is to improve drainage. If the drainage is not good, water may enter between the tire and the road surface wet with rainwater, and friction between the tire and the road surface will be lost, which may lead to a traffic accident.

However, as the groove of the current tire is formed smoothly and the tread is formed of hydrophilic silica rubber, the water flow rate is formed slowly in the groove and the water flow rate is also small, so drainage is not good, so water may remain in the groove this is high

Accordingly, if water remains in the groove, the tire may slip due to aquaplaning and a traffic accident may occur.

Embodiments of the present invention were invented in the background as described above, and an object of the present invention is to provide a tire capable of smoothly discharging water from a groove.

The pneumatic tire according to the embodiment of the present invention has a tread portion in contact with a road surface, a shoulder portion formed in the width direction on both sides of the tire around the tread portion, and at least one of a surface of the tread portion and a surface of the shoulder portion to be drawn inward. a groove formed in a depression, wherein the groove is a side surface concave from any one of the surface of the tread portion and the surface of the shoulder portion, and a bottom surface that forms a boundary with the side surface and is parallel to any one of the surface of the tread portion and the surface of the shoulder portion Including, a plurality of nano-protrusions may be formed only on the bottom surface.

The nano-protrusions may be formed of a hydrophobic material, and a film may be further included between the nano-protrusions and the bottom surface.

The film may have a thickness of 0.5 mm or more and 1 mm or less.

The film may be formed of a metal material including at least one of gold, silver, and copper.

The groove is formed in plurality,

The plurality of grooves may include a main groove and a sub groove formed smaller than the main groove, and the plurality of nano-protrusions may be formed only on the bottom surface of the main groove.

In the tire according to the embodiment of the present invention, as a hydrophobic material is applied to the groove and a plurality of nano-protrusions are formed on the bottom surface of the groove, water can be efficiently discharged from the groove.

1 is a view showing a pneumatic tire according to an embodiment of the present invention;
2 is a view showing a groove of a pneumatic tire according to an embodiment of the present invention.
3 is a view showing the shape of the water penetrating into the groove.

Hereinafter, specific embodiments for implementing the technical idea of the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, when a component is referred to as 'connected' or 'contacted' to another component, it may be directly connected or contacted with the other component, but it should be understood that other components may exist in the middle.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in the present specification, the expressions of the upper side, the lower side, the side, etc. are described with reference to the drawings, and it is to be noted in advance that if the direction of the corresponding object is changed, it may be expressed differently. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

Meanwhile, the radial direction to be described below means the radial direction of the tire. The axis may mean a rotation axis of the tire, and the axial direction may mean a direction parallel to the rotation axis of the tire. The axial direction does not necessarily pass through the center of the rotation axis of the tire, but includes a direction parallel to the direction of the rotation axis of the tire. In addition, the circumferential direction is a direction along the outer circumferential surface of the tire, and means a direction perpendicular to the radial direction. The circumferential direction may be any one of a clockwise direction and a counterclockwise direction when viewed from the side of the tire.

Meanwhile, unless otherwise specified, the directions include both positive and negative directions.

Hereinafter, a pneumatic tire 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

1 is a view showing a pneumatic tire according to an embodiment of the present invention, FIG. 2 is a view showing a groove of a pneumatic tire according to an embodiment of the present invention, and FIG. 3 is a view showing the shape of water penetrating into the groove It is a drawing.

1 and 2 , a pneumatic tire 1 according to an embodiment of the present invention includes a tread 20, a belt 30, a shoulder 40, a side wall 50, and a bead. (60), the carcass 70, may include a groove (80).

The tread unit 20 is disposed on the outside of the tire, corresponds to a thick rubber layer in a configuration in which the road surface is directly grounded, and may be formed of a rubber material with strong cut-off, impact and abrasion resistance to protect the inside of the tire. Grooves 80 may be disposed on the surface of the tread 20 to be spaced apart from each other at predetermined intervals to improve water 2 discharge performance, condition friction performance, and the like.

The belt part 30 is formed inside the tread part 20 . The belt part 30 is formed of a steel wire or fiber to reduce the impact on the road surface when the tire is running between the tread part 20 and the carcass 70, and to keep the part in contact with the road surface of the tread part 20 wide for driving. It serves to improve stability.

The shoulder part 40 serves to connect the tread part 20 and the side wall part 50 . Accordingly, the shoulder part 40 is positioned from the edge of the tread part 20 to the upper part of the side wall part 50 and is manufactured in consideration of external exposure and heat dissipation. In addition, the groove 80 may be disposed on the shoulder portion 40 to improve water 2 drainage performance, condition friction performance, and the like, similarly to the tread portion 20 . The shoulder part 40 may be formed of the same material as the tread part.

The side wall part 50 is formed to extend from the shoulder part 40 formed at the end of the tread part 20 . The side wall part 50 serves to protect the carcass 70 from the side of the pneumatic tire 1 that can change a pattern and improve riding comfort through bending motion.

The bead part 60 is formed at the end of the side wall part 50 and serves to be fixed to the rim (not shown) of the pneumatic tire 1 . Accordingly, it may be composed of a bead wire that fixes the tire to the rim with an iron core bundle coated with rubber and an apax 64 that protects the bead wire 62 by mitigating external impact with a triangular rubber filler. .

The carcass 70 forms an air receiving portion of the tire, and contributes to maintaining the shape of the pneumatic tire 1 . Accordingly, the carcass 70 may be formed to extend from the inside of the belt part 30 along the inside of the tread part 20 , the side wall part 50 , and the bead part 60 .

As described above, the groove 80 is drawn in from any one of the surface of the tread 20 and the surface of the shoulder 40 in order to improve the tire's water 2 drainage performance, condition friction performance, and the like. It may be formed to be recessed as much as possible. Here, the surface of the tread part 20 is a part in contact with the road surface, and the surface of the shoulder part 40 may be formed to extend from the surface of the tread part 20 in the direction of the side wall part 50 .

Accordingly, the groove 80 formed in the tread part 20 is formed in the circumferential direction of the tread part 20 , in the axial direction on the surface of the tread part 20 , or diagonally on the surface of the tread part 20 . It may be formed in various ways, such as formed in a direction. The groove 80 formed in the shoulder part 40 may also be variously formed on the surface of the shoulder part 40 in a circumferential direction, a radial direction, and the like.

Again, as shown in FIG. 2 , the groove 80 forms a concave-indented side 810 from any one of the surface of the tread 20 and the surface of the shoulder 40, and the side 810 and the boundary. It may include a bottom surface 820 parallel to any one of the surface of the tread portion 20 and the surface of the shoulder portion 40 . In other words, the groove 80 formed in the tread portion 20 forms a boundary with the side surface 810 and the side surface 810 that are concave in the surface of the tread portion 20 , and a bottom surface parallel to the surface of the tread portion 20 . The groove 80 formed of 820 and formed in the shoulder part 40 forms a boundary with the side surface 810 and the side surface 810 that are concave in the surface of the shoulder part 40 and forms a boundary with the shoulder part 40 surface and It may be formed of parallel bottom surfaces 820 .

In addition, a plurality of nano-protrusions 840 may be formed in the groove 80 . For example, a plurality of nano-protrusions 840 may be formed only on the bottom surface 820 of the groove 80 , and the nano-protrusions 840 may be formed on the bottom surface enough to cover all of the bottom surface.

Accordingly, the plurality of nano-protrusions 840 may be arranged along the longitudinal direction in which the bottom surface 820 of the groove 80 is formed, and may be formed of a wax component to prevent penetration of water 2 . Since the nano-protrusions 840 are not formed on the side surface 810 of the groove 80, when the cross-section of the groove 80 in the direction perpendicular to the circumferential direction of the tread portion 20 is viewed, the side surface 810 is smooth or It may be smoothly formed in a straight line.

Accordingly, the water 2 penetrating into the groove 80 is formed in the shape of a water droplet by increasing the surface tension by the plurality of nano-protrusions 840, and flows along the shape of the groove 80 in the groove 80. can be expelled quickly.

Unlike the above, at least a portion of the groove 80 may be coated with a hydrophobic material. For example, the hydrophobic material may be applied to the bottom surface 820 of the groove 80 . The hydrophobic material is a material that does not mix well with water (2) and may include a fluororesin.

Accordingly, as shown in FIG. 3 , the water 2 penetrating into the groove 80 is formed in the shape of a water droplet due to an increase in surface tension according to the hydrophobic material, and flows along the shape of the groove 80 when driving. It can be quickly discharged from the groove (80). In detail, the angle between the side surface of the water 2 and the bottom surface 820 of the groove 80 is formed at 90 degrees so that when driving, the water 2 may flow in the groove 80 .

The hydrophobic material may have a thickness of 0.5 mm or more and 1 mm or less. When the thickness is 0.5 mm or less, the applied hydrophobic material may be peeled off due to deformation or heat generated during tire driving. Performance degradation may occur.

According to the above, in the pneumatic tire 1 according to the embodiment of the present invention, water (2) penetrating into the groove 80 by forming a plurality of nano-protrusions 840 in the groove 80 or applying a hydrophobic material. can be efficiently discharged to prevent water film phenomenon.

If the plurality of nano-protrusions 840 are not formed in the groove 80 or the hydrophobic material is not painted, the water 2 penetrating into the groove 80 is the tread 20 and the shoulder portion ( 40), it may remain in the groove 80, and a water film phenomenon may occur in the tire. In detail, as shown in FIG. 3 , the angle between the side surface of the water 2 and the bottom surface 820 of the groove 80 is formed at 30 degrees, so that it remains in the groove 80 even when driving.

In addition, as described above, the reason for forming the plurality of nano-protrusions 840 or the hydrophobic material only on the bottom surface 820 is to maintain the snow performance of the tire. On a road surface where snow is formed, as foreign substances penetrate into the groove, friction of the tire is increased and propulsion is generated. This friction can be reduced if a hydrophobic material is applied throughout the groove.

The plurality of nano-protrusions 840 of the pneumatic tire 1 according to another embodiment of the present invention may be formed of a hydrophobic material. A hydrophobic material may be coated on the plurality of nano-protrusions 840 .

In this case, the water 2 penetrating into the groove 80 becomes superhydrophobic close to a perfect sphere on the upper side of the plurality of nano-protrusions 840 as shown in FIG. 3 , and can be efficiently drained from the groove 80 . . In detail, the angle between the side surface of the water 2 and the bottom surface 820 of the groove 80 may be formed to be 150 degrees, so that when driving, the water 2 may flow in the groove 80 . In this case, the nano-protrusion 840 may have a size of 10 to 100 nm.

In addition, a film may be provided between the nano-protrusion 840 and the bottom surface 840 of the groove, and the film may be formed of a metal material including at least one of gold, silver, and copper. Here, the film may be formed to be 0.5 mm or more and 1 mm or less. If the film is formed to be less than 0.5 mm, it may be peeled off by deformation or heat generated during tire driving. degradation may occur.

The plurality of nano-protrusions 840 may be formed of a hydrophobic material on the surface of the film using a technique called Self Assemble Monolayer (SAM). SAM refers to an organic monolayer that is spontaneously formed on a solid surface. The molecules used are largely divided into three parts: the Head Group, which plays an important role in forming a monomolecular film by chemically adsorbing on the film surface, the Hydro Chain that helps the molecular film align through van der Waals interactions, and the ability to introduce various types of functional groups. It is divided into possible terminal groups. Here, the functional group may be formed as a non-polar functional group.

Meanwhile, a plurality of grooves 80 may be formed. The plurality of grooves 80 may include a main groove 82 and a sub groove 84 formed smaller than the main groove 82 . In this case, as the sub-groove 84 is formed to be small, the plurality of protrusions 840 and the film may be formed only on the bottom surface 820 of the main groove 82 . The main groove 82 may be formed along the circumferential direction of the tire, and the sub groove 84 may extend in various directions from the main groove 82 or may be formed in the circumferential direction along the main groove 82. .

Although FIG. 1 shows that the groove 80 formed in the tread portion 20 is formed of the main groove 82 and the sub groove 84, the groove 80 formed in the shoulder portion 40 is also the main groove. 82 and a sub-groove 84 may be included.

Meanwhile, the hydrophobic material may be applied to at least one of the main groove 82 and the sub groove 84 .

Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be interpreted as having the widest scope according to the technical idea disclosed in the present specification. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

1: pneumatic tire 20: tread
30: belt part 40: shoulder part
50: side wall portion 60: bead portion
62: bead wire 64: apax
70: carcass 80: groove
82: main groove 84: sub groove
810: side 820: bottom surface
840: nano projections

Claims (5)

a tread in contact with the road surface;
Shoulder parts formed in the width direction of both sides of the tire around the tread part; and
a groove formed to be recessed so as to be drawn in from at least one of the surface of the tread part and the surface of the shoulder part;
the groove is
a side concave formed from any one of the surface of the tread and the surface of the shoulder; and
and a bottom surface forming a boundary with the side surface and parallel to any one of the tread surface and the shoulder surface,
A plurality of nano-protrusions are formed only on the bottom surface,
Further comprising a film positioned between the nano-protrusion and the bottom surface,
The film is formed of a metal material containing at least one of gold, silver and copper,
pneumatic tires. The method of claim 1,
The nano-protrusions are formed of a hydrophobic material,
pneumatic tires. The method of claim 1,
The thickness of the film is formed to be 0.5 mm or more and 1 mm or less,
pneumatic tires. delete The method of claim 1,
The groove is formed in plurality,
The plurality of grooves include a main groove and a sub groove formed smaller than the main groove,
The plurality of nano-protrusions are formed only on the bottom surface of the main groove,
pneumatic tires.

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