KR840000295B1 - Radial Frame Tires for Soil Transport Special Maintenance - Google Patents

Abstract

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Description

Radial Frame Tires for Soil Transport Special Maintenance

1 is a radial cross-sectional view of a crown of a tire having a limiting block consisting of two plies.

FIG. 1B is a plan view of the ply showing the cable of each ply of FIG. 1A. FIG.

FIG. 2 is an enlarged radial cross-sectional view showing a restriction block formed by folding a single ply.

The present invention relates to a radial skeleton tire composed of a radial skeleton reinforcement fixed to both sides of at least one bead ring and a tread reinforcement having a radial curvature less than the radial curvature of the radial skeleton reinforcement. The tread reinforcement is formed of two layers of plies consisting of wires or cables, each wire or cable being parallel to each other in each ply, intersecting with the wires or cables of the other ply, and forming an acute angle of less than 30 ° with respect to the longitudinal direction of the tire. The tread stiffeners are parallel to the radial framework stiffeners along the equator, and the radial frames stiffeners have a radial shape with the maximum curvature located on the shoulder of the tire and the minimum curvature located between the shoulders of the tire on its radially outer half. .

Increasing the curvature of the tread stiffeners is necessary to improve the shape and characteristics of the tyre (such as load bearing capacity and tread life) mentioned here.

However, using this method for very large tires used in very large tanks or other trucks or soil transport equipment requires the use of a lot of rubber in the tire shoulder position. This results in heating that will compromise the service life of such tires.

In U.S. Patent No. 3789900, it is provided to reduce the amount of rubber in the shoulder area and at the same time reduce the curvature of the tread reinforcement.

Thinning the shoulders can be obtained by pushing the spine reinforcement to the radially outer side by a corrective ply located at the height of the shoulder on the outer side of the spine reinforcement. This structure reduces heating in the shoulder region but prevents the heating of the equator region, which impairs the life of the crown stiffener, by extending the width of the equator region parallel to the tread stiffener to transmit the expansion force due to the expansion pressure to the tread stiffener. Cause

It is an object of the present invention to obviate the influence of the expansion trust of the spin-frame reinforcement on the tread reinforcement and thereby alleviate this structural drawback.

The present invention provides a limiting block formed of a double-ply of cable having a radial framework reinforcement pushed toward the radially outer surface in the shoulder region, the tread reinforcement and the radial framework reinforcement having a low elongation between the two reinforcements in the parallel equator region. And the cable is parallel in each ply and intersects with the cable of the other ply, and the angle to the middle direction of the tire is less than half of the minimum angle of the tread stiffener, preferably 5 ° to 10 And forming an angle of degrees, wherein the limiting block is a radial framework tire having a width less than that of the equatorial region where the tread reinforcement and the spinal framework reinforcement are parallel.

인 공식에서 구하여 진다. 이 공식은 본 발명이 어떻게 제한블록각(α)를 고려하는지 특히 트레드 보강재에 사용된 최소각의 1/2보다 작은 제한 블록각(α)을 고려하는지를 보여주고 있다. 따라서 제한블록의 플라이 인장력(T)는 항상 트레드 보강재의 최소각을 갖는 인장력보다 작다. 따라서 방사 골조 보강재에 의한 인장력에 의한 제한블록의 신장력은 작게된다. 이것은 트레드 보강재에 이러한 인장력이 전달되는 것을 방지하기 위한 것이다.The tensile force per unit width (T) present in the ply ideal by the radial skeleton reinforcement measured in the axial direction is P, the inflation pressure of the tire, P, the radius of the ply relative to the axis of rotation of the tire, R, Assume that α

It is obtained from the formula This formula shows how the present invention takes into account the limiting block angle [alpha], in particular the limiting block angle [alpha] less than half of the minimum angle used in the tread stiffener. Thus the ply tension T of the confinement block is always less than the tensile force with the minimum angle of the tread stiffener. Therefore, the elongation force of the limiting block due to the tensile force by the radial skeleton reinforcement is small. This is to prevent such tension from being transmitted to the tread reinforcement.

The transfer of tensile forces by the pressure of the spinal framework stiffeners is blocked as much as possible, and the present invention is limited to non-zero angles with respect to the longitudinal direction in view of the fact that the steel or fiberglass is substantially unextended but there are no unstretched fly stiffener elements. It is configured to install the pile reinforcement element of the block. Crossed plies reduce the meridional curvature of the confinement block due to internal pressure. According to the present invention, the radial curvature of the spinning frame reinforcement and, thereby, the shoulder adjustment of the shoulder can be easily adjusted.

이 0.2%보다 적다.Low-extension cables are metal cables, preferably steel wire, having a high cable lay (typically tPS, turns per inch, which is used as the twisting unit of the cable) of 12 to 20 times the outer diameter of the cable. These cables have a relative elongation at 10% of the cable breaking load.

Is less than 0.2%.

It is also advantageous to place them close together with the cables of the plies.

Another advantage of replacing the correction ply on the shoulder by the limiting block according to the invention is to compress the rubber forming the shoulder of the tire, ie the lateral region of the tread. This state of stress reduces the occurrence of cracking due to fatigue at the bottom of the curved element, which is present in the lateral region of the tread. This condition is due to the fact that the outer surface of the equator region covered by the confinement block is covered by the confinement block, resulting in a natural meridian equilibrium shape, such as the shape that assumes that the spine framework stiffener is free of any stiffener under expansion pressure.

It is also necessary to use the width of the confinement block as 5 to 80% of the maximum axial width of the spinal skeleton stiffener in order to increase the width of the equator region parallel to the tread stiffener as necessary. Specifically, when the radial height of the tire on the rim is C, the maximum axial width of the H spinning frame reinforcement is C, the ratio of H / C is about 1 to 12% and the ratio of H / C is about 0.75. When the ratio of about 40% H / C is about 0.3 has a width of 45 to 80%.

The corner of the limit block is protected since it is located in the low deformation area. One ply of the confinement block is narrower than the other, and the difference in width is not more than 10% of the width of the wide ply.

The confinement block can also be formed as a single folded ply.

Preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The crown of the tire 1 shown in FIG. 1a is composed of a tread 2, a radial framework reinforcement 3, a tread reinforcement 4 and a restriction block 5.

The spin-frame reinforcement 3 is formed of a single ply of steel cable fixed in a conventional manner to a bead (not shown) of a tire. The radial framework stiffener 3 in the crown region has its minimum curvature at the point where it meets the equator region, i.e., the locus line x-x 'of the equator plane. Also in the same area, the radial skeleton reinforcement 3 has a maximum curvature at the position of the shoulder 11. Therefore, the thickness of the shoulder 11 of the tire 1 provided with the limiting block according to the present invention is reduced in size e compared to the thickness (shown in dashed lines) of the tire 1 'which is not provided with the limiting block. It is.

Similarly, the width L of the equator region in which the tread reinforcement 4 of the tire according to the invention comprises between two points 12, 12 ′ parallel to the radial framework reinforcement 3 is defined by the limiting block 5. It is larger than this width l between two points 13, 13 ′ of the missing tire.

The tread reinforcement 4 consists of two layers of plies 41, 42 of cables intersecting one another with cables of another ply on one ply. The restriction block 5 is formed of two plies 51, 52 between the two reinforcements 3, 4. The radial outer ply 52 intersects the other plies 51 and forms an angle α opposite to each other, the angle α being defined by the ply 42 relative to the longitudinal direction x-x '. Is less than half of the angle β (less than 30 °). The width l ₂ of the radial outer ply 52 is also narrower than the width l ₁ of the radial inner ply 51. The width l ₁ of the limiting block 5 is narrower than the width L of the equator region in which the tread reinforcement 4 is parallel to the spine reinforcement 3. Outside the width L of the equator region, the tread reinforcement 4 has a radius of curvature less than that of the spinal framework stiffener 3.

For the sake of clarity, the cables of the plies 41, 42 of the tread reinforcement 4 are shown in a straight line away from one another in a wide width. However, the cables of the limiting block 5 are drawn closely to show that they are formed adjacent to each other by the preferred embodiment.

In the variant shown in FIG. 2, the limiting block 5 ′ is such that the edges 54, 55 of the ply 53 face along a circle 56 parallel to the longitudinal line x-x '. It is formed of a ply 53 that is folded. However, the limiting block 5 can also be made by folding a ply, such as a ply 51, itself having a suitable width.

Although referred to by the above description and claims in terms of the minimum angle of the ply of the tread reinforcement with respect to the longitudinal direction, the present invention can also be used in the case of a ply having the same angle (with its absolute value) in the direction and thus the longitudinal direction. The angle formed by the cable of the confinement block with respect to shall be less than the angle of the ply of the tread stiffener (not the minimum angle).

Claims (1)

At least on one side of the bead ring 3 and having a radial shape in which the radially outer half has a maximum curvature located on the shoulder 11 of the tire and a minimum curvature located between the shoulder 11 of the tire. The radial skeleton reinforcement 3 and the wire having a radial curvature less than the radial curvature of the radial skeleton reinforcement and parallel to each ply but crossing each other on each other to form an angle β of 30 ° or less with respect to the longitudinal direction of the tire. Or a double ply with a low elongation, which is formed of a cable and consists of a tread stiffener (4) parallel to the radial framework stiffener (3) along the equator region, and between the two stiffeners, which is parallel in each ply but crosses each other in the other ply Restriction block 5 formed of (51, 52) is provided, the limiting block (5) is the width of the equator region where the tread reinforcement member is parallel to the spine reinforcement (L) In a radial skeleton tire having a width l ₁ ), the wires or cables of the two plies 51 and 52 are metallic and the angle α formed in the longitudinal direction of the tire is preferably 5 to 10. Radial frame tires for special soil transport equipment, characterized in that the absolute value is less than half of the minimum angle of the tread reinforcement and disposed adjacent to each other.

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