CN111660731A

CN111660731A - All-steel-wire load-carrying radial tire

Info

Publication number: CN111660731A
Application number: CN201911295016.9A
Authority: CN
Inventors: 朱典武; 吕昌保
Original assignee: Hubei Oles Tire Co ltd
Current assignee: Hubei Oles Tire Co ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-09-15

Abstract

The invention relates to the technical field of tires, and provides an all-steel-wire heavy-duty radial tire which comprises a tire body, wherein the tire body comprises an inner liner, a carcass layer, a belted layer, a protective layer and a tread layer which are sequentially arranged from inside to outside.

Description

All-steel-wire load-carrying radial tire

Technical Field

The invention relates to the technical field of special type automobile pneumatic tires, in particular to an all-steel-wire truck radial tire.

Background

At present, the all-steel truck radial tire technology in China is introduced in developed countries in Europe and America, but because the freight market and road conditions in China, southeast Asia and other countries are obviously different from those in Europe and America, the all-steel truck radial tire technology introduced in Europe and America is generally used under the conditions of higher air pressure and very high load, the all-steel truck radial tire technology introduced in Europe and America has obvious defects, particularly the problem that the tire bead performance cannot meet the actual market easily occurs, and the early failure rate of the all-steel truck radial tire in the heavy-load market is high. Many research and development centers mainly study and innovate the structure and the steel wire material of tire, and the more complicated the structure is, the more the process is, the heavier the tire is, bring very big difficulty for factory manufacturing quality control, manufacturing efficiency and tire cost to the effect is not very obvious, and the early failure rate of heavy load market is improved to some extent but is still high. Therefore, problems of endurance early fatigue damage of the bead such as bead breakage, wire blowout and the like still exist and seriously affect the economy and user satisfaction of the all-steel heavy duty tire.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide an all-steel-wire heavy-load radial tire which is used for solving the problems of tire bead cracks and wire drawing explosion caused by overlarge tensile strain of a carcass steel wire, which are easily generated by rapid over-bending of the conventional radial tire for a heavy-load vehicle under the heavy-load condition.

Disclosure of the invention

In order to solve the technical problem, the invention provides an all-steel-wire heavy duty radial tire which comprises a tire body, wherein the tire body comprises an inner liner, a tire body layer, a belt ply, a protective layer and a tread layer which are sequentially arranged from inside to outside, and a convex tire bead fixing part is arranged at the joint of a tire shoulder and a tire side plate of the tread layer.

Further, a lower side wall arc R4 and a lower transition arc R5 are sequentially arranged below a center line L of a tread layer of the tire body, the lower transition arc R5 is tangent to the reverse arc of the lower side wall arc R4 to form an arc LR45, a tire bead arc R6 is further arranged above the lower tread of the tire body, and an inverted triangle formed between the tire bead arc R6 and the arc LR45 is a tire bead fixing portion.

Further, a bead arc R7 which is tangent to the bead arc R6 in the opposite direction is arranged below the bead arc R6.

Further, the center of the bead arc R6 is at a vertical distance h2 from the tread layer of the tire body, and the radius is R6,15.5mm < h2 < 23.5mm, and 15.5mm < R6 < 32 mm.

Further, the outermost side of the bead fixing portion projecting outward is at a vertical distance w3,17.5mm ≦ w3 ≦ 45mm from the bead arc R6 and the outer tangent of the bead arc R7.

Further, the sum of the radius of the bead arc R6 and the radius of the bead arc R7 is h3, and 30.5mm < h3 < 64 mm.

Furthermore, the radius of the lower transition arc R5 is R5, and R5 is more than or equal to 30 mm.

(III) advantageous effects

The invention provides an all-steel-wire heavy-duty radial tire which comprises a tire body, wherein the tire body comprises an inner liner, a tire body layer, a belted layer, a protective layer and a tread layer which are sequentially arranged from inside to outside; the tire bead fixing part is additionally arranged to increase the rigidity and elasticity of the top end of the tire bead fixing part, so that the deformation and torsional deformation of the tire bead part of the tire under the high-rigidity support of the outer rim of the rim under the load or in sharp bending can not be increased instantaneously, the strain energy generated by the stress strain of the reversely-wrapped end point of the carcass steel wire can not be increased instantaneously, and the problems of tire bead cracking and wire drawing explosion caused by the separation of the reversely-wrapped end point of the carcass steel wire and a sizing material due to too large strain are avoided; meanwhile, the top end of the tire bead retaining part is prevented from generating fatigue cracks of the rubber material due to frequent work; and a better protection effect is provided when the outer hard objects are prevented from striking and rubbing the rim, and the bead retainer and the rim outer rim are prevented from being scratched and damaged to be curled when the outer hard objects are scratched.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of an all-steel wire heavy duty radial tire of the present invention;

fig. 2 is a schematic structural view of a general radial tire.

FIG. 3 is a schematic structural diagram of a standard rim used in an all-steel wire heavy duty radial tire of the present invention.

Fig. 4 is a schematic structural view of an all-steel wire heavy duty radial tire according to example 1 after being assembled with a standard rim.

Fig. 5 is a schematic structural view of an all-steel wire heavy duty radial tire of example 1 assembled with a standard rim under a standard air pressure.

Fig. 6 is a schematic structural view of an all-steel wire heavy duty radial tire of example 1 assembled with a standard rim under a standard air pressure and a standard load.

FIG. 7 is a schematic view of a conventional radial tire assembled with a standard rim.

Fig. 8 is a schematic structural view of a conventional radial tire assembled with a standard rim under a standard air pressure.

FIG. 9 is a schematic view of a conventional radial tire assembled with a standard rim under standard air pressure and standard load.

The reference numerals in the figures illustrate:

1-shoulder arc R1; 2 — upper transition arc R2; 3-upper sidewall arc R3;

4-lower sidewall arc R4; 5 — lower transition arc R5; 6-bead arc R6;

7-bead arc R7; 8-a bead fixing portion; 9-new tire profile;

10-a rim; 11-general tire profile.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention relates to an all-steel wire load-carrying radial tire, as shown in figure 1, comprising a tire body, wherein the tire body comprises an inner liner, a tire body layer, a belt layer, a protective layer and a tread layer which are sequentially arranged from inside to outside, a convex tire bead fixing part 88 is arranged at the joint of a tire shoulder and a tire side plate of the tread layer, the tire bead fixing part 88 is characterized in that an inverted trapezoid (or an inverted triangle) which is convex outwards and has an elastic bottom surface and rigidity is additionally arranged at the joint of the tire shoulder and the tire side plate of the tread layer of the existing load-carrying radial tire, the concrete structure is described in detail by combining figures 1 and 2, the structure of a common radial tire is shown in figure 2, a tire shoulder arc R1, an upper transition arc R2, an upper tire side arc R3, a lower tire side arc R4, a lower transition arc R5, a tire bead arc R6, a bead straight line L2 and a bead arc R7 are arranged on the tire body from top to bottom, and the load-carrying radial tire with the conventional, due to extrusion of rubber, the rubber is seriously extruded and deformed under standard air pressure standard load, the extrusion and deformation of the rubber are serious under the action of internal pressure and load due to inconsistent assembly surface profile of the tire bead rubber above a wheel rim, and the problem of extrusion and protrusion of the rubber can cause the tire bead to be cracked and the like due to compression and heat generation of the rubber when the tire frequently steps on the ground and steps off the ground in the running process. As shown in fig. 1, the lower transition arc R5 and the lower sidewall arc R4 form a profile LR45 tangent to each other in a reverse arc, and an inverted trapezoid (or inverted triangle) protruding outward with an elastic bottom surface and having rigidity is added to the profiles LR45 and the bead arc R6, which is referred to herein as a bead fixing portion 8, and the bead fixing portion 88 can effectively prevent the bead breaking and the more serious wire bursting problem of the tire due to the carcass turn-up strain caused by the creep of the bead and the rim due to the rapid and instantaneous turning of the tire under load.

Meanwhile, in order to enhance the enveloping performance of the all-steel load radial tire, a bead contour curve is that a bead arc R6 is drawn on a bead straight line L2 at a bead arc height H2, a point on the bead straight line L2 at the bead arc height H2 connects a positioning straight line L3 to a bead retaining portion width w3 and a bead retaining portion height H3 as O points, an arc drawing a lower transition arc R5 with the lower sidewall arc R4 by taking the O points as the center of a circle, the positioning height H2 of the bead arc R6 is larger than 0.5 mm-3 mm of the H value of a rim to be used as the starting point of the bead arc R6, the end point of the bead arc R6 is at the bead retaining portion positioning width w3 and the bead retaining portion positioning height H3, so that the bead retaining portion 8 is enveloped on the outer rim of a rim 11 under the conditions of no load or full load, particularly when the tire is turned sharply, the tire at the contact bottom surface of the tire is firmly enveloped by the outer rim 10 under the condition that the bead retaining portion is locked, the tire can provide traction torque transmitted by a vehicle to smoothly pass through, the tire bead fixing part 8 is equivalent to that two mechanical hands are additionally arranged on two sides of the tire bead part of the tire, assistance is provided for advancing and turning during loading, the rigidity of the tire bead and the timeliness of torque transmission are increased, and the elastic assistance is matched with the rigidity of a wheel rim in self-adaptive adjustment; and the profile can also improve the assembling quality of the tire and the rim, ensure that the tire bead can be well assembled in the bead seat of the rim during the assembling of the tire, and improve the dynamic safety strength multiple of the tire bead.

The mine pattern of the 12.00R20 standard tire is adopted, and experimental verification of different sizes is carried out by a contour scanning method.

Example 1.

The bead arc height h2 has a value of 21.53mm, the bead arc R6 has a radius of 28.58mm, the bead retention portion positioning width has a value of 37.31mm, the bead retention portion positioning height h3 has a value of 50.41mm, the bead retention portion thickness has a value of 4mm, and the lower transition arc R5 has a radius of 45 mm.

Assembling the tire with the tire bead retaining part with the size on a rim, filling standard air pressure and carrying out profile analysis under three conditions of standard air pressure load to respectively obtain

profile maps

4, 5 and 6, and carrying out profile analysis on the tire of the common profile of the tire without the tire bead retaining part under the same three conditions to respectively obtain

profile maps

7, 8 and 9; the rubber material at the tire bead part with the common contour is extruded by the rubber material when the tire bead part is filled with standard air pressure, the extrusion deformation of the rubber material is serious under the standard air pressure load, the extrusion deformation bulge of the rubber material is serious under the action of internal pressure and load due to the inconsistent contour of an assembly surface of the tire bead rubber material above a rim, and the problem of the extrusion bulge of the rubber material can cause the tire bead to be cracked and the like due to the compression heat generation of the rubber material when the tire frequently steps on the ground and steps off the ground in the driving process.

Example 2.

The embodiment differs from embodiment 1 only in the relevant dimensional differences, the bead arc height h2 having a value of 21.53mm, the bead arc R6 having a radius of 25.66mm, the bead retainer positioning width having a value of 29.88mm, the bead retainer positioning height h3 having a value of 47.36mm, the bead retainer thickness having a value of 8mm, the lower transition arc R5 being a straight line connection.

Further, the tire of the embodiment 1, the embodiment 2 and the common profile is subjected to a bead pressure distribution ratio test after assembling a rim in a laboratory through a scheme of pressure sensitive paper, the contact pressure between the bead and the wheel rim of the embodiment 1 and the embodiment 2 is small and is uniformly distributed along the outer rim; the contact pressure between the bead and the rim of a common profile is not uniformly distributed, the contact pressure is lower at the place where the compression of the rubber material is small, and the contact pressure is very high at the place where the compression of the rubber material is large. The uniform distribution of the contact pressure is one of the quality indexes for ensuring the durability of the tire bead, and the durable service life of the tire bead can be ensured only by the uniformly distributed contact pressure.

In a tire bead durable drum comparison experiment carried out in a laboratory, the test standard is that the loading load is 160 percent of the standard load, the test air pressure is 80 percent of the standard air pressure, and the running speed is 50km/h (in order to avoid the influence of crown heat generation caused by increasing the load on the test result, the tire tread of the tire in the comparison test is polished to the position of a wear identifier at this time), and the comparison test result is as follows: from the bead endurance test results, it is understood that the bead endurance times of examples 1 and 2 are relatively close, but are improved by about 1.61 times as compared with the bead endurance time of the normal profile.

The results of the experiment are shown in the following table:

further comparing the production quality, the tires of the two schemes only detect one bead bubble through the quality inspection result of the nondestructive detection bubbling machines with limited production of the examples 1 and 2, and the manufacturing defect rate of the bead bubble and the delamination of the normally produced common profile tire is between 0.2 and 0.3 percent; and the tires produced in limited quantities in examples 1 and 2 had no bead appearance bubbles, while the bead appearance bubbles of the normally produced tires of conventional profile averaged 0.25%. Therefore, the all-steel-wire truck radial tire is easier to produce and apply, and can improve the qualification rate of production quality and reduce the manufacturing cost.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an all steel silk load radial tire, includes the tire body, the tire body includes inside to outside inner liner, carcass layer, belted layer, protective layer and the tread layer of arranging in proper order, its characterized in that, the tire shoulder and the curb plate joint of tread layer are provided with convex tire bead fixed part.

2. The all-steel wire heavy-load radial tire according to claim 1, wherein a lower sidewall arc R4 and a lower transition arc R5 are sequentially arranged below a center line L of a tread layer of the tire body, the lower transition arc R5 is tangent to the lower sidewall arc R4 to form an arc LR45, a bead arc R6 is further arranged above a lower tread of the tire body, and an inverted triangle formed between the bead arc R6 and the arc LR45 is the bead fixing portion.

3. An all-steel heavy duty radial tire according to claim 2, wherein a bead arc R7 is provided under said bead arc R6 and is tangent to it in the opposite direction.

4. The all-steel wire heavy duty radial tire according to claim 1, wherein a vertical distance between a center of the bead arc R6 and a tread layer of the tire body is h2, a radius is R6,15.5mm ≦ h2 ≦ 23.5mm, and 15.5mm ≦ R6 ≦ 32 mm.

5. The all-steel heavy-duty radial tire according to claim 2, wherein a perpendicular distance between the outermost side where said bead fixing portion protrudes outward and an outer tangent of said bead arc R6 and said bead arc R7 is w3,17.5mm ≦ w3 ≦ 45 mm.

6. The all-steel heavy duty radial tire according to claim 2, wherein the sum of the radius of said bead arc R6 and the radius of said bead arc R7 is h3,30.5mm ≦ h3 ≦ 64 mm.

7. The all-steel wire heavy-duty radial tire according to claim 1, wherein the radius of said lower transition arc R5 is R5, R5 is equal to or greater than 30 mm.

8. The all-steel radial truck tire according to claim 3, wherein said bead arc R6 has a perpendicular distance H2 from a tangent point of said bead arc R7 to a ground contact surface of said carcass layer, a rim H value of H1, H2 ≦ H1+ s,0.5mm ≦ s ≦ 3 mm.