KR100897056B1 - Method for designing side profile of ultra high performance tire - Google Patents

Abstract

The present invention relates to a method for designing a side profile of an ultra-high performance tire, comprising: a method for designing a side profile of a tire that connects a tread end point X of a tread curve and an end point D of a longest width line of the tire with a first curve, wherein the D is the above-mentioned. A second curve having an imaginary point M on an extension line of the longest width line SW and having a radius of curvature within 100% to 200% of the radius of curvature of the first curve from M and the tread curve extending beyond the X point. An extension line is connected to select an X 'point at which the extension line of the second curve and the tread curve intersects as a new tread end point, and the X point is shouldered from P point at which the mold curve line of the tire crosses the second curve. Connecting in a curve, and making contact with the first curve in a third curve with a radius of curvature within 15 mm to 50 mm from the P point. Thus, while maintaining a constant longest tire width SW to maintain the side stiffness of the ultra-high performance tires, the tire is moved at high speed by moving the trailing end point outward of the tire by X to X 'points to extend the maximum tread width. It has the effect of having stability, cornering stability and braking stability.

Tire, side profile

Description

METHOD FOR DESIGNING SIDE PROFILE OF ULTRA HIGH PERFORMANCE TIRE}

The present invention relates to a method of designing a side profile of an ultra-high performance tire, and more particularly, to a method of designing a side profile of an ultra-high performance tire so as to have a maximum tread width while maintaining side tire rigidity under a constant tire longest width (SW) condition. It is about.

As is well known, Ultra High Performance Tires (UHPT) are tires that can be mounted in a high performance / high power vehicle. This ultra-high performance tire is generally formed with a low flat ratio so as to have characteristics of excellent braking force, instantaneous acceleration force, traction force and adjustment safety.

The wider the ground area the tire has, the higher the speed running stability, the cornering stability and the braking stability. The tire ground area is wider as the tread width is longer when the tire maximum width SW is the same.

In the case of ultra-high performance tires, it is difficult to design a long tread width because the range of the maximum tire height (SH) to the tread width is small within the limited longest tire width (SW).

As such, the super high-performance tire has a low ratio of the maximum height (SH) of the tire, so that when the tread width is designed to be wide, the shape of the tire side becomes flat and the stiffness of the side decreases during the spring rate test. Have

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a method of designing a side profile of an ultra high performance tire to have a maximum tread width at a constant longest tire width SW while maintaining the side rigidity of the ultra high performance tire.

In order to achieve the above object, the side profile design method of the ultra-high performance tire of the present invention is a tire side profile design method of connecting the tread end point X of the tread curve and the end point D of the longest width line of the tire with the first curve. Holding a virtual point M on an extension line of the longest width line SW from D and extending beyond the second point and a second curve having a radius of curvature within 100% to 200% of the radius of curvature of the first curve from M; Connecting an extension line of the tread curve, selecting an X 'point at which the second curve and the extension line of the tread curve intersect as a new tread end point, and from the P point where the second curve and the mold parting line of the tire intersect. Connect the X point with a shoulder curve and contact the first curve with a third curve with a radius of curvature within 15 mm to 50 mm from the P point. Connect to achieve.

Here, the distance L between the M point and the D point may include Omm <L ≦ 7mm.

In addition, the height of the mold parting line is preferably made within the range of 10% to 30% of the maximum height of the tire.

In addition, the curvature of the second curve may include a range of 100% to 120% of the curvature of the first curve.

In addition, the curvature of the third curve may include a range of 15mm to 50mm.

The method of designing the side profile of the ultra-high performance tire of the present invention, while maintaining a constant longest tire width (SW) so as to maintain the side rigidity of the ultra-high performance tire, the trailing end point to the outside of the tire by X point X 'point By moving to extend the maximum tread width, the tire has the effect of having high speed running stability, cornering stability and braking stability.

Hereinafter, exemplary 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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

Hereinafter, a side profile design method of an ultra high performance tire according to an embodiment of the present invention will be described in comparison with a general side profile design method of an ultra high performance tire.

First, a side profile design method of a general ultra high performance tire will be described with reference to FIG. 1.

1 is a partial schematic diagram illustrating a method of designing a side profile of a general ultra high performance tire.

Referring to FIG. 1, the cross-sectional shape of the ultra-high performance tire is composed of a tread portion 10, a shoulder portion 20, a side wall portion 30, and a bead portion 40.

The present invention relates to a method for designing a side profile of an ultra-high performance tire, and the side 50 means the boundary portion between the shoulder portion 20 and the side wall portion 30, that is, X point to D point.

Here, the X point is the end point of the trade curve TR that determines the maximum width of the tread, and the D point is the end point of the maximum width SW that determines the maximum width of the ultra-high performance tire 1.

Accordingly, the profile of the side 50 is composed of a first curve USHR1 connecting the X point and the D point, and the profile of the shoulder 20 is the X where the trade curve TR and the first curve USHR1 meet. It consists of a shoulder curve (SHR) connecting the vicinity of the point.

However, in the case of the ultra-high performance tire 1, it is difficult to design a long tread width because the range of the maximum tire height SH relative to the tread width is small within the limited longest tire width SW.

Hereinafter, referring to FIGS. 2 and 3, while maintaining the stiffness of the side 50 of the ultra-high performance tire 1 according to an embodiment of the present invention, the ultra-high performance to have a maximum tread width at a constant longest tire width SW. How to design a side profile of a tire.

FIG. 2 is a schematic diagram illustrating a method of designing a side profile of an ultra-high performance tire according to an exemplary embodiment of the present invention, and FIG. 3 is an enlarged view of part III of FIG. 2.

2 and 3, the method for designing the profile of the side of the ultra-high performance tire according to the present embodiment first catches the virtual point M on the extension line of the longest width line SW from D. FIG.

M is an imaginary point spaced apart from D by a distance L on the longest width line SW, where L is preferably O <L ≦ 7 mm. Here, when L exceeds 7 mm, the difference in width between the first curve USHR1 and the second curve USHR2 to be described later is increased so that the first curve USHR1, the second curve USHR2 and the side profile are formed. The contact point of the third curve USHR3 having the inverse curvature is disturbed so that the side profile of the tire has an incomplete shape.

Next, the tread curve TR is connected from M to the second curve USHR2, and an 'X' point where the extension line of the second curve USHR2 and the tread curve TR meets is selected as a new tread end point. Therefore, it is possible to design by increasing the size of the tread width by moving in the transverse direction by M than the existing X point.

The radius of curvature of the second curve USHR2 is preferably formed within the range of 100% to 120% of the radius of curvature of the first curve USHR1 starting from the middle of the longest width line SW and not exceeding the P point of the first curve. Do.

Here, when the radius of curvature of the second curve USHR2 is less than 100% of the radius of curvature of the first curve USHR1, the radius of curvature is formed too rapidly to lower the stiffness of the side 50 and the curvature of the first curve USHR1. If the radius is greater than 120%, the tire ply position will be bent at the mid-section, reducing tire side stiffness.

Inverse curvature of the shoulder curve SHR connecting the X point from the P point where the second curve USHR2 and the mold parting line PL of the tire intersect, and the first curve USHR2 connecting the D point. It is connected to the third curve (USHR3) having a.

Here, the mold paTRing line PL is a line in which the upper and lower molds (not shown) of the vulcanization mold and the seg molds (not shown) of the circumferential direction are coupled to each other when the ultra high performance tire 1 is vulcanized. From the highest point of the ultra high performance tire, the height PH is formed within 10% to 30% of the longest height SH of the tire.

As such, the reason for placing the inflection point P where the shoulder curve SHR and the third curve USHR3 intersect on the mold parting line PL is that extraction is performed between the upper and lower molds and the segment in the circumferential direction during the vulcanization process. This is to match the generated part to prevent extraction and to make the appearance of the inflection part more beautiful.

In addition, the radius of curvature of the third curve USHR3 is within the range of 15 mm to 50 mm. Here, when the radius of curvature of the third curve USHR3 is less than 15 mm, the first curve USHR1 and the second curve USHR2 cannot be smoothly connected. When the radius of curvature exceeds 50 mm, the third curve USHR3 having an inverse curvature. By this, the side of the ultra-high performance tire is made too concave inward.

As described above, the side profile design method of the ultra-high performance tire of the present embodiment maintains a constant longest tire width SW to maintain the side stiffness of the ultra-high performance tire 1, while maintaining the end point of the tire by X 'to X' points. Move it outward to extend the maximum tread width. Therefore, the ultra-high performance tire 1 makes it possible to improve high speed running stability, cornering stability and braking stability.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

1 is a partial schematic diagram illustrating a method of designing a side profile of a general ultra high performance tire.

Figure 2 is a schematic diagram showing a side profile design method of a high performance tire according to an embodiment of the present invention.

FIG. 3 is an enlarged view of part III of FIG. 2.

<Description of Main Reference Signs>

10: tread portion 20: shoulder portion

30: side wall part 40: bead part

50: side D: longest endpoint

PL: Mold parting line PH: Mold parting line height

SH: Longest tire height SW: Longest tire width

TR: Tread Curve SHR: Shoulder Curve

USHR1: first curve USHR2: second curve

USHR3: Third Curve X: Tread End Point

Claims (5)

In the tire side profile design method of connecting the tread end point X of the tread curve TR and the end point D of the longest width line SW of the tire with the first curve USHR1, Hold the virtual point M on the extension line of the longest width line SW from the D, From the M to connect the second curve (USHR2) having a radius of curvature within 100% to 200% of the radius of curvature of the first curve (USHR1) and the extension line of the tread curve (TR) extending beyond the X point X 'point at which the extension line of the second curve USHR2 and the tread curve TR intersects is selected as a new tread end point, The X point is connected to the shoulder curve SHR from the point P at which the second curve USHR2 and the mold parting line PL of the tire cross each other. And a third curve having a radius of curvature within 15 mm to 50 mm and forming a reverse curvature with the second curve USHR2, and connecting the first curve with the first curve from the P point to have a contact point. In claim 1, The distance L between the M point and the D point is O mm <L ≤ 7 mm side profile design method of a high performance tire. In claim 1, The height of the mold parting line is a side profile design method of the ultra-high performance tire comprising the tire in the range of 10% to 30% of the maximum height. delete delete

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