KR100807428B1 - Snow tire with surface processing tread - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-treated snow tire, which is subjected to a vulcanization process by a tread mold, and surface treated so that a plurality of grooves are formed on the vulcanized tread surface. An object of the present invention is to improve the braking force and driving traction of a tire, and to improve the handling performance of a tie on a dry road surface.

To this end, in the present invention, the tread surface grounded with the road surface is surface-treated so that a plurality of grooves are formed, and the plurality of grooves are predetermined in the circumferential direction of the tread with respect to the center line which is the center of the width direction of the tread. A first tangent curved groove 14 having a width w and a depth h of 9 and symmetrical to the first tangent curved groove with respect to the centerline and the first tangent It is formed to have a second tangent curved groove 15 having the same width (w), depth (h), and angles (θ1, θ2) as the curved groove, the first and second tangent curved Each of the grooves may be arranged in a plurality of consecutively and intersecting with each other at the same distance (d) upward or downward with respect to the center line.

Snow, tire, tread, groove, tangent curve, mold, machining

Description

SNOW TIRE WITH SURFACE PROCESSING TREAD}

1 is a cross-sectional view showing the structure of a general tire.

Fig. 2 is a plan view showing a sipe of a snow tire according to a conventional example.

3 is an exemplary view showing a state in which a sipe in a snow tire according to a conventional example acts on a snow road surface;

4 is a cross-sectional view showing an example of a general vulcanization mold.

5 is a plan view showing a tread pattern shape of a snow tire according to the present invention.

Figure 6 is a schematic tread partial exploded view for explaining the structure of the tangent curved groove formed in the tread of the snow tire according to the present invention.

Figure 7 is a schematic tread partial exploded view for explaining the process of forming a tangent curved groove in the tread of the snow tire according to the present invention.

8 is an enlarged cross-sectional view taken along a line S-S of FIG.

Explanation of symbols on the main parts of the drawings

11: longitudinal groove, 12: lateral groove

13: block 14: first tangent curved groove

15: second tangent curved groove

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-treated snow tire, and more particularly, to a snow road surface by grooves formed by surface treatment so that a plurality of grooves are formed on a vulcanized tread surface by performing a vulcanization process by a tread mold. And it relates to a snow tire that can improve the braking force and running traction of the tire on the freezing road surface and improve the handling performance of the tie on the dry road surface.

In general, the tire is, as shown in FIG. 1, between a tread 101 in contact with the road surface, a carcass 102 forming the skeleton of the tire, between the tread 101 and the carcass 102. An installed liner layer 103, an inner liner 104 for preventing air leakage; Side wall (105) to protect the carcass 102 and to allow flexible flexing movement; It consists of the bead part 106 which mounts a tire to a rim. In addition, the pattern of the tread 101 is composed of a plurality of tread blocks (Block, B) and a plurality of grooves (Groove, G) formed between the plurality of tread blocks (B), respectively.

Such a tire is extruded a compounded rubber obtained by mixing various chemicals such as carbon black and sulfur, which is a kind of black pigment, with natural rubber, which is a raw material, or the compounded rubber as a cord or bead wire. After the green tire is completed through a molding process combining various semi-finished products cut through a rolling process topping to a wire or the like by a molding machine, the green tire is finally put into a vulcanization mold and subjected to high pressure and high temperature for a predetermined time. The addition is made by performing a vulcanization step.

Snow tires, unlike the above-described general tires, have a large number of small blocks in the tread blocks B of the tires that are grounded with the road surface, as shown in FIG. 2, in order to improve the grip force on the snow road surface and the freezing road surface in winter. A groove, that is, a sipe (Sipe, 110) is provided.

The sipe 110 is formed in a direction orthogonal to the circumferential direction of the tire, that is, in the axial direction of the tire, and has a structure in which the center portion is bent in a wave form. In the snow tire, the rear end portion 110b is spaced apart from the road surface and the road surface R at the front end portion 110a when the snow tire travels on the snow road surface R as shown in FIG. 2 by the structure of the sipe 110. ), The tire will be able to prevent skidding.

However, since the shape of the sipe 110 is formed in the axial direction of the tire, it is possible to increase the anti-skid performance by increasing the ground area with respect to the road surface R as described above. There was a problem in that the acceleration power is lower than the normal road and the vehicle is not completely controlled.

Therefore, conventionally, as a method for improving the braking force and the acceleration force in winter, snow tires are provided with spike studs of metallic studs on the tread block of the tire.

In order to install such spike pins on a tread block of a tire, first, a green tire is charged into a vulcanization mold provided with spike pinhole forming pins and subjected to a vulcanization process, thereby producing a tire having spike pinholes formed on the tread of the tire. . Subsequently, the snow tire provided with the spike pin is manufactured by forcibly inserting the spike pin into the spike pinhole.

However, since such spike pins are exposed from the tread surface, such conventional snow tires are worn out due to friction with the road surface for long periods of use, which may reduce the braking effect of the vehicle on the freezing road surface. There is a problem that not only destroys the road surface with noise generation when driving on the melted general road, but also significantly reduces the handling performance.

Accordingly, the present invention has been made to solve the above-described problems, and the surface treatment is performed such that a plurality of grooves are formed on the vulcanized tread surface by performing a vulcanization process by a tread mold without installing a metal stud in the tread portion. It is an object of the present invention to improve the braking force and the driving traction force of the tire on the snow road surface and the icy road surface by the formed grooves.

In order to achieve the above object, the present invention,

The tread surface grounded with the road surface has a plurality of grooves formed on the surface thereof,

The plurality of grooves may include a first tangent curved groove having a predetermined width w and depth h in the circumferential direction of the tread with respect to the center line, which is the center of the width direction of the tread. It is formed to have a second tangent curved groove symmetrical to the first tangent curved groove with respect to the center line and having the same width (w) and depth (h) as the first tangent curved groove,
Further, in the present invention, the first tangent curved groove is progressive from the intersection point to the right width end of the tread based on the intersection point of the center line and the middle line in the tread width direction perpendicular to the center line. It is characterized in that it consists of a curved groove A increasing to and a curved groove B symmetrical by rotating 180 degrees clockwise or counterclockwise about the intersection.

The first and second tangent curved grooves may be arranged in a plurality of repetitively and intersecting with each other at the same distance (d) upward or downward with respect to the center line, respectively.

delete

Further, in the present invention, the curved groove A gradually increases from the intersection point to the right width end of the tread when dividing the tread right width end from the center line into the first to fourth quadrants. It is characterized in that it is formed to have an angle α1 (α2) (α3) (α4).

(Where α1: an angle between the tangent tangent to an arbitrary point of the curved groove A passing between the centerline and the first equal line and the centerline intersect,

α2: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the first equal line and the second equal line and the first equal line intersect,

α3: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the second equal line and the third equal line and the second equal line intersect,

α4: the angle between the tangent tangent to an arbitrary point of the curved groove A passing between the third equal line and the fourth equal line and the third equal line intersect)

Further, in the present invention, the curved groove B is from the intersection point P to the left width end of the tread when dividing the tread left width end into the first to fourth quadrants from the center line. It is characterized in that it is formed to have a gradually increasing angle (α1) (α2) (α3) (α4).

(Where α1: an angle between the tangent tangent to an arbitrary point of the curved groove A passing between the centerline and the first equal line and the centerline intersect,

α2: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the first equal line and the second equal line and the first equal line intersect,

α3: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the second equal line and the third equal line and the second equal line intersect,

α4: the angle between the tangent tangent to an arbitrary point of the curved groove A passing between the third equal line and the fourth equal line and the third equal line intersect)

Further, in the present invention, the interval d is characterized in that 5 to 15mm.

Further, in the present invention, the widths w and the depths h of the first and second tangent curved grooves are 0.1 to 3.0 mm, respectively.

Moreover, in this invention, the said 1st and 2nd tangent curved groove | channel is formed so that the upper end width and the lower end width may be the same. It is characterized by the above-mentioned.

In addition, in the present invention, the first and second tangent curved grooves are formed in a structure inclined at constant angles θ1 and θ2 such that the bottom width thereof is narrower than the top width, wherein the angles θ1, θ2) is an angle between each sidewall of the first and second tangent curved grooves and a straight line vertically lowered from the tread to the road surface.

In the present invention, the angles θ1 and θ2 are 3 ° to 45 °.

Further, in the present invention, the first and second tangent curved grooves are formed in the block 13 of the tread.

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

5 is a plan view showing a tread pattern shape of a snow tire according to the present invention, Figure 6 is a schematic tread partial development for explaining the structure of the tangent curved groove formed in the tread of the snow tire according to the present invention, 7 is a schematic exploded view of a tread portion for explaining a process of forming a tangent curved groove in a tread of a snow tire according to the present invention, and FIG. 8 is an enlarged cross-sectional view of an SS line in FIG. 5.

The snow tire according to the present invention has a plurality of grooves as shown in FIG. 5 on the surface of the tread which has been vulcanized after the vulcanization process by preliminary surface treatment on the vulcanization mold without installing a metallic stud on the tread. 14, 15). In Fig. 5, reference numeral 11 denotes a longitudinal groove formed in the circumferential direction (longitudinal direction) of the tire, reference numeral 12 denotes a lateral groove formed in the width direction (lateral direction) of the tire. '13' represents a block divided by the longitudinal grooves 11 and the horizontal grooves 12.

In order to manufacture the tire of the present invention having such a structure, it is necessary to process a plurality of projections corresponding to the plurality of grooves 14 and 15, respectively, in advance in the vulcanization mold.

Generally, as shown in FIG. 4, the vulcanization mold includes a pair of side molds 120a and 120b in which the inside is recessed in the shape of the tire so as to form an inner surface having the same shape as that of the finished tire. Tread mold 121 is coupled to the inner peripheral portion of the side mold (120a, 120b) to form a tread of the tire, that is, a tread having a pattern consisting of a plurality of grooves and blocks so as to contact the road surface when the tire is running, causing friction. Consists of.

In the present vulcanization mold, a plurality of protrusions corresponding to a plurality of grooves having a shape as described later in the circumferential direction are preliminarily processed on the inner surface of the tread mold 121.

According to the present invention, by putting a green tire into a vulcanization mold including the tread mold 121 having such a structure, and performing a vulcanization process, a snow tire having grooves surface-treated naturally on the vulcanized tread can be obtained. The grooves can improve road braking, driving traction and handling in winter.

The structure of the plurality of grooves will be described with reference to FIGS. 6 to 8.

6 and 7 are schematic exploded views of the tread, for the sake of simplicity of explanation and simplification of the drawing, showing only a part of the grooves formed in the tread surface of the tire vulcanized by the vulcanization process as described above.

It should be noted that a plurality of protrusions corresponding to the plurality of grooves described below are designed in the same shape on the circumferential surface of the tread mold.

As shown in FIG. 6, the plurality of grooves 14 and 15 are first tangent curved grooves formed in the circumferential direction T of the tread with respect to the centerline CL, which is the center of the width direction of the tread. And a second tangent curved groove 15 that is symmetrical with the first tangent curved groove 14 with respect to the center line CL.

Furthermore, the first and second tangent curved grooves 14 and 15 are arranged in a plurality of successive repetitions with the same distance d upward or downward with respect to the center line CL, respectively, FIG. 5. As shown in the figure is formed to cross each other.

The first tangent curved groove 14 has an intersection point based on an intersection point P at which the center line CL and the middle line ML in the tread width direction perpendicular to the center line CL intersect. The curved groove A gradually increasing with a predetermined angle from (P) to the right width end of the tread and the curved groove A around the intersection point P rotated 180 ° clockwise or counterclockwise. Includes a curved B that is symmetric when

The curved groove A is a tread from the intersection point P when the center line CL divides from the center line CL to the end of the right width of the tread into the first to fourth quadrants L1, L2, L3, and L4. It is preferable to be formed to have an angle α1 (α2) (α3) (α4) gradually increasing to the right width end of the.

Here, angle (alpha) 1 is between the tangent which contact | connects the arbitrary point of the curved groove | channel A which passes between the center line CL and the said 1st dividing line L1, and the centerline CL intersect. The angle α2 is a tangent in contact with an arbitrary point of the curved groove A passing between the first equal line L1 and the second equal line L2 and the first equal line ( An angle between the intersections of L1), and the angle α3 is a tangent tangent to an arbitrary point of the curved groove A passing between the second equal line L2 and the third equal line L3. An angle α4 is an angle between intersections of the second equal line L2c, and the angle α4 is an arbitrary portion of the curved groove A passing between the third equal line L3 and the fourth equal line L4. The angle between the tangent tangent to the point of intersection and the third equilateral line L3 intersects.

Similarly, the curved groove B is progressively divided from the intersection point P to the left width end of the tread when dividing the tread left width end from the center line CL into the first to fourth quadrants. It has a form with increasing angles α1, α2, α3, α4.

The first and second tangent curved grooves 14 and 15 thus formed are arranged in the same shape with the same spacing d, respectively, as shown in FIG. That is, when the first tangent curved groove 14 is described as an example, as shown in FIG. 6, the first tangent curved groove 14 is formed in the circumferential direction of the tire based on the center line CL. Then, a second tangent curved groove 14 having an equal distance d above the first tangent curved groove 14 with respect to the center line CL is formed, and again the center line ( Continuously arranged in such a manner as to form a third tangent curved groove 14 having the same distance d above the second tangent curved groove 14 relative to CL). Similarly, the second tangent curved grooves 15 are also arranged continuously and repeatedly with the same distance d in the above-described form. In the present invention, the interval d preferably has a range of 5 to 15 mm.

When the plurality of first and second tangent curved grooves 14 and 15 are repeatedly arranged in this way, as shown in FIG. 5, the patterns intersect each other in a narrowing direction toward the center line L. A tread having can be obtained. In FIG. 5, the first and second tangent curved grooves 14 and 15 are shown to pass through the longitudinal grooves 11 and the horizontal grooves 12, but the depths of the grooves 14 and 15 will be described later. As described above, since it is smaller than the depth of the longitudinal grooves 11 and the lateral grooves 12 (for example, 5 to 11 mm), they are actually formed only on the surface of the block 13 of the tread.

Meanwhile, as described above, the plurality of first and second tangent curved grooves 14 and 15 arranged at equal intervals and intersecting with each other have a predetermined width, as shown in FIG. (w) and depth (h), the upper width and the lower width of the same, the cross-sectional shape is formed in the 'c' shape. Further, the first and second tangent curved grooves 14 and 15 have a predetermined width w and depth h, as shown in Fig. 8 (b), and the lower width thereof is the upper width thereof. More narrowly, the structure may be inclined at predetermined angles θ1 and θ2, that is, in an inverted trapezoidal shape in cross section. The former is more difficult to process in the tread mold than the latter, but because it has the same width it can exhibit excellent snow characteristics on the snow road surface and freezing road surface.

Here, it is preferable that the width w and depth h of the said 1st and 2nd tangent curved groove | channel have 0.1-3.0 mm or less, respectively. The angles [theta] 1 and [theta] 2 are angles between the respective sidewalls of the tangent curved grooves and the straight lines vertically lowered from the tread, and preferably have a range of 3 ° to 45 °.

In the tire of the present invention configured as described above, the driving traction and braking property can be improved while improving drainage by a plurality of curved grooves formed so as to cross-arrange on the tread when driving the snow road surface, When driving, stable handling performance can be secured without generating noise with the road surface.

As described above, according to the present invention, a plurality of grooves corresponding to the plurality of protrusions are formed in the tread of the vulcanized tire when the tire is vulcanized by pre-processing a plurality of protrusions having a specific shape in the tread mold forming the tread. By surface treatment as much as possible, it is possible to improve the braking force and acceleration force on the snow road surface and the freezing road surface, and to improve the handling performance on the dry road surface.

Claims (10)

In a snow tire having a block 13 partitioned by a plurality of grooves 11 and 12 formed on the tread surface of the tire, The tread surface has a plurality of grooves 14 and 15 formed on the surface thereof. The plurality of grooves 14 and 15 may have a first tangent curve having a predetermined width w and depth h in the circumferential direction of the tread with respect to the centerline CL, which is the center of the tread width direction. tangent curve groove 14 and a width w symmetrical with the first tangent curve groove 14 relative to the centerline CL and equal to the first tangent curve groove 14. And a second tangent curved groove 15 having a depth h, The first tangent curved groove 14 has an intersection point based on an intersection point P at which the center line CL and the middle line ML in the tread width direction perpendicular to the center line CL intersect. A curved groove A that gradually increases from (P) to the right width end of the tread, and a curved groove B that is symmetrical by rotating 180 ° clockwise or counterclockwise about the intersection, The first and second tangent curved grooves 14 and 15 may be arranged in a plurality of consecutively and intersecting with each other at equal intervals d or upwards with respect to the center line CL. Surface-treated snow tires. delete The method of claim 1, The curved groove A gradually increases from the intersection point P to the right width end of the tread when dividing the tread right width end from the center line CL into the first to fourth quadrants. A surface-treated snow tire, characterized in that it is formed to have angles α1, α2, α3, and α4. (Where α1: an angle between the tangent tangent to an arbitrary point of the curved groove A passing between the centerline and the first equal line and the centerline intersect, α2: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the first equal line and the second equal line and the first equal line intersect, α3: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the second equal line and the third equal line and the second equal line intersect, α4: the angle between the tangent tangent to an arbitrary point of the curved groove A passing between the third equal line and the fourth equal line and the third equal line intersect) The method of claim 1, The curved groove B is an angle α1 that gradually increases from the intersection point P to the left width end of the tread when dividing the tread left width end from the center line into first to fourth quadrants. and (α2) (α3) (α4). (Where α1: an angle between the tangent tangent to an arbitrary point of the curved groove A passing between the centerline and the first equal line and the centerline intersect, α2: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the first equal line and the second equal line and the first equal line intersect, α3: an angle between a tangent tangent to an arbitrary point of the curved groove A passing between the second equal line and the third equal line and the second equal line intersect, α4: the angle between the tangent tangent to an arbitrary point of the curved groove A passing between the third equal line and the fourth equal line and the third equal line intersect) The method of claim 1, The gap d is surface treated snow tire, characterized in that 5 to 15mm. The method of claim 1, The width w and the depth h of the first and second tangent curved grooves 14 and 15 are 0.1 to 3.0 mm, respectively. The method of claim 1, And the first and second tangent curved grooves (14, 15) are formed such that their upper and lower widths are the same. The method of claim 1, The first and second tangent curved grooves 14 and 15 are formed in a structure inclined at predetermined angles θ1 and θ2 such that the bottom width thereof is narrower than the top width thereof, wherein the angles θ1 and θ2 Is an angle between each side wall of the first and second tangent curved grooves (14, 15) and a straight line vertically descending from the tread to the road surface. The method of claim 8, The angle (θ1, θ2) is a surface-treated snow tire, characterized in that 3 ° to 45 °. The method according to any one of claims 1 to 3, wherein Surface-treated snow tires, characterized in that the first and second tangent curved grooves (14, 15) are formed in blocks (13) of the tread.

Images