Tire crown cord structure

Abstract

The present invention relates to the technical field of automobile tires, and in particular to a tire crown cord structure, comprising a crown upper layer rubber, a crown lower layer rubber, a belt layer, a shoulder pad rubber and a tire body, wherein the belt layer comprises a first belt, a second belt and a third belt stacked from top to bottom, and further comprises a buffer layer and a wrapping belt; the buffer layer is arranged between the first belt and the second belt, and the two wrapping belts are symmetrically wrapped around the two sides of the first belt; by arranging the buffer layer between the first belt and the second belt, the buffer effect of the tire crown is improved, and by wrapping the wrapping belt around the shoulder of the first belt, the buffer layer is cooperated to prevent the tire shoulder from bursting, thereby solving the technical problem in the prior art that the all-steel radial tire cannot well withstand the influence of vehicles and cargo as well as bad road conditions under harsh use environments such as overpressure and overload, and is prone to defects such as crown bursting and shoulder cracking, thereby improving the service life of the tire.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile tires, and in particular to a tire crown cord structure. Background Art

[0002] All-steel radial tires, constructed with steel wire as their frame, are widely used in large vehicles such as trucks, buses, and construction machinery. They are suitable for high-load, high-pressure operating environments. Construction vehicles, in particular, often operate in harsh road conditions, subject to numerous factors such as high and low temperatures, wet and slippery conditions, rough terrain, and muddy conditions. Therefore, all-steel radial tires must possess excellent impact resistance and durability. The crown structure of the tire is a crucial factor in ensuring these qualities.

[0003] The general tire crown structure is composed of crown rubber, base rubber, several layers of belt cord, shoulder pad rubber, carcass, inner liner and other components. Common belt structures include three-layer belt structure, two layers of zero-degree winding belt plus three-layer belt structure, and four-layer belt structure.

[0004] However, in harsh operating environments such as overpressure and overload, all-steel radial tires cannot withstand the impact of vehicles, cargo, and harsh road conditions. They are prone to defects such as crown cracks and shoulder cracks, which seriously affect the service life of the tires. Summary of the Invention

[0005] The purpose of the present invention is to provide a tire crown cord structure and a motor vehicle using the same, so as to solve the technical problem in the prior art that all-steel radial tires are difficult to withstand the impact of vehicles and cargo as well as harsh road conditions under harsh operating environments such as overpressure and overload, are prone to defects such as crown cracking and shoulder cracking, and seriously affect the service life of the tires.

[0006] In a first aspect, the present invention provides a tire crown cord structure comprising an upper crown rubber layer, a lower crown rubber layer, a belt layer, a shoulder rubber layer, and a tire carcass, wherein the belt layer comprises a first belt, a second belt, and a third belt stacked from top to bottom, and further comprises a buffer layer and a wrapping belt;

[0007] The buffer layer is disposed between the first belt and the second belt, and the two wrapped belts are symmetrically wrapped around shoulders of the first belt.

[0008] Furthermore, the buffer layer includes a buffer film and a nylon wrapping cloth, and the two nylon wrapping cloths are respectively arranged on both sides of the buffer film and abut against the buffer film.

[0009] Furthermore, the cross-sectional width of the crown upper layer rubber along the vertical direction is K, and the cross-sectional length of the buffer rubber along the vertical direction ranges from K / 12 to K / 6.

[0010] Furthermore, a cross-sectional length of the buffer layer in the vertical direction is greater than 1.2 times a cross-sectional length of the second belt in the vertical direction.

[0011] Furthermore, a cross-sectional length of the buffer layer in the vertical direction is less than 1.5 times a cross-sectional length of the second belt in the vertical direction.

[0012] Furthermore, the distance between the two wrapping belts is greater than K / 3, and the distance between the two wrapping belts is less than K / 2.

[0013] Furthermore, a cross-sectional length of the buffer layer in the vertical direction is greater than the sum of a cross-sectional length of the two wrapping belts in the vertical direction and a distance between the two wrapping belts.

[0014] Further, the sum of the cross-sectional lengths of the two wrapping belts in the vertical direction and the distance between the two wrapping belts is greater than 1.1 times the cross-sectional length of the second belt in the vertical direction.

[0015] Further, the sum of the cross-sectional lengths of the two wrapping belts in the vertical direction and the distance between the two wrapping belts is less than 1.2 times the cross-sectional length of the second belt in the vertical direction.

[0016] Compared with the prior art, the present invention provides a tire crown cord structure, including a crown upper layer rubber, a crown lower layer rubber, a belt layer, a shoulder pad rubber and a tire body, the belt layer including a first belt, a second belt and a third belt stacked from top to bottom, and also including a buffer layer and a wrapping belt; the buffer layer is arranged between the first belt and the second belt, and the two wrapping belts are symmetrically wrapped on both sides of the first belt; by arranging a buffer layer between the first belt and the second belt, the buffering effect of the tire crown is improved, and the wrapping belt is arranged on the shoulder of the first belt, and the buffer layer is cooperated to prevent the tire shoulder from bursting, which solves the technical problem in the prior art that the all-steel radial tire cannot withstand the impact of vehicles and cargo as well as harsh road conditions under harsh use environments such as overpressure and overload, and is prone to defects such as crown bursting and shoulder cracking, thereby improving the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A cross-sectional view of the overall structure of the tire crown cord structure provided by an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional expansion diagram of a tire crown cord structure provided by an embodiment of the invention.

[0020] Reference numerals:

[0021] 100, upper layer of tire crown; 200, lower layer of tire crown;

[0022] 300, belt layer; 310, first belt; 320, second belt; 330, third belt;

[0023] 400, buffer layer; 410, buffer film; 420, nylon wrapping cloth;

[0024] 500, winding belt;

[0025] 600. Tire pad rubber. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0029] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0031] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0033] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a tire crown cord structure, including a crown upper layer rubber 100, a crown lower layer rubber 200, a belt layer 300, a tire cushion rubber 600 and a carcass, the belt layer 300 includes a first belt 310, a second belt 320 and a third belt 330 stacked from top to bottom, and also includes a buffer layer 400 and a wrapping belt 500; the buffer layer 400 is arranged between the first belt 310 and the second belt 320, and the two wrapping belts 500 are symmetrically wrapped around the shoulders of the first belt 310.

[0034] That is, the tire crown cord structure provided by the present invention improves the buffering effect of the tire crown by arranging a buffer layer 400 between the first belt 310 and the second belt 320, and prevents the tire shoulder from bursting by wrapping the belt 500 around the shoulder of the first belt 310 in cooperation with the buffer layer 400. This solves the technical problem in the prior art that under harsh operating environments such as overpressure and overload, the all-steel radial tire cannot withstand the impact of vehicles and cargo as well as harsh road conditions, and is prone to defects such as crown bursting and shoulder cracking, thereby improving the service life of the tire.

[0035] Specifically, in this embodiment, the upper vertical portion of the tire consists of a crown rubber layer 100, a crown lower rubber layer 200, a belt layer 300, a wrapping belt 500, a nylon wrapper 420, a cushioning film 410, a belt interlayer, a tire cushioning rubber 600, and a tire carcass. In a vertical cross-section, these layers are stacked from top to bottom. The first, second, and third belts 310, 320, and 330 are stacked from top to bottom, with the cushioning layer 400 positioned between the first and second belts 310, 320, protecting the carcass and innerliner and withstanding external forces. The wrapping belt 500 is placed at both ends of the first belt 310 using a zero-degree wrapping method. The tire crown is symmetrically arranged about its horizontal centerline in a cross-section. Therefore, the crown width can be divided into three equal sections: the crown center and the crown edges. The vertical cross-sectional width of the crown upper rubber layer 100 is the crown width K. Among the three belts, the second belt 320 is the widest, and the distance between its two ends and the center line is equal, both L. The distance between the starting point of the zero-degree wrapping belt 500 and the center line is h1, the width of the zero-degree wrapping belt 500 is c, and the width of the nylon wrap 420 is b.

[0036] Furthermore, the buffer layer 400 includes a buffer film 410 and a nylon wrapping cloth 420 . The two nylon wrapping cloths 420 are respectively disposed on both sides of the buffer film 410 and abut against the buffer film 410 .

[0037] Specifically, the cushioning film 410 is positioned in the middle of the crown, and the nylon wrapping 420 is attached to the endpoints of the cushioning film 410. This allows two nylon wrappings 420 to be positioned on either side of the cushioning film 410 and abut against it. The cushioning film 410 is made of rubber to withstand the pressure in the middle of the crown, while the nylon wrappings 420 are made of nylon and wrapped around the crown edges at zero degrees to prevent shoulder rupture.

[0038] Preferably, the cross-sectional width of the crown upper rubber layer 100 along the vertical direction is K, and the cross-sectional width of the buffer rubber sheet 410 along the vertical direction ranges from K / 12 to K / 6.

[0039] Specifically, the vertical cross-sectional width of the cushioning film 410 is twice the distance from the ends of the cushioning film 410 to the midline in the cross-sectional view. The distance from the starting point of the nylon wrapping 420 to the midline is h, and the vertical cross-sectional width of the cushioning film 410 is twice h. In this embodiment, K / 6>h>K / 12. This ensures that the cushioning film 410 is neither too short, thereby losing its cushioning effect, nor too long, causing the starting point of the nylon wrapping 420 to be off the center of the crown, affecting the winding effect.

[0040] Furthermore, the cross-sectional width of the buffer layer 400 in the vertical direction is greater than 1.2 times the cross-sectional width of the second belt 320 in the vertical direction.

[0041] Specifically, the vertical cross-sectional width of the buffer layer 400 is twice the sum of the distance h from the starting point of the nylon wrap 420 to the centerline and the width b of the nylon wrap 420, while the vertical cross-sectional width of the second belt 320 is twice the distance L between the two ends of the second belt 320 and the centerline. Therefore, the vertical cross-sectional width of the buffer layer 400 is greater than 1.2 times the vertical cross-sectional width of the second belt 320, that is, (h+b) / L>1.2. This ensures that the buffer layer 400 can fully wrap around the second belt 320 and the third belt 330 and extend above the tire padding 600 located at both ends of the second belt 320 and the third belt 330, thereby strengthening the shoulder strength, effectively preventing shoulder cracks, enhancing shoulder support, increasing the rectangular coefficient of the ground contact patch, and improving tire handling performance.

[0042] Furthermore, the cross-sectional width of the buffer layer 400 in the vertical direction is less than 1.5 times the cross-sectional width of the second belt 320 in the vertical direction.

[0043] Specifically, the vertical cross-sectional width of the buffer layer 400 is twice the sum of the distance h from the starting point of the nylon wrap 420 to the centerline and the width b of the nylon wrap 420. The vertical cross-sectional width of the second belt 320 is twice the distance L between the ends of the second belt 320 and the centerline. Therefore, the vertical cross-sectional width of the buffer layer 400 is less than 1.5 times the vertical cross-sectional width of the second belt 320, i.e., (h + b) / L > 1.5. This prevents the buffer layer 400 from excessively extending into the tire shoulder, facilitating heat dissipation from the shoulder and preventing excessive heat buildup in the shoulder that could impact the tire's fatigue life.

[0044] Furthermore, the distance between the two wrapping belts 500 is greater than K / 3, and the distance between the two wrapping belts 500 is greater than K / 2.

[0045] Specifically, the distance between the two winding belt bundles 500 is twice the distance h1 from the starting point of the zero-degree winding belt bundle 500 to the center line. Therefore, the distance between the two winding belt bundles 500 is greater than K / 3, that is, h1 > K / 6. This ensures that the starting point of the winding belt bundle 500 is wound at the shoulder at the crown edge, preventing shoulder burst. And the distance between the two winding belt bundles 500 is less than K / 2, that is, h1 < K / 4. This ensures that the winding belt bundle 500 can completely cover both ends of the first belt bundle 310, achieving the effect of strengthening the shoulder strength, effectively preventing shoulder crack, improving the shoulder support force, increasing the rectangular coefficient of the ground contact mark, and improving the tire handling performance.

[0046] Furthermore, the cross-sectional width of the buffer layer 400 in the vertical direction is greater than the sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500.

[0047] Specifically, the cross-sectional width of the buffer layer 400 in the vertical direction is h + b, and the sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500 is h1 + c. The cross-sectional width of the buffer layer 400 in the vertical direction is greater than the sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500, that is, h + b > h1 + c. Thus, it can be ensured that the width of the winding belt bundle 500 is less than the width of the buffer layer 400, and then the winding belt bundle 500 and the nylon wrapper 420 are arranged in a stepped manner on the tire base rubber 600. When the nylon wrapper 420 partially covers the tire base rubber 600, the zero-degree winding belt bundle 500 completely wraps the end point of the second belt bundle 320 and does not completely cover the tire base rubber 600, which is beneficial to shoulder heat dissipation and prevents the shoulder from generating too much heat and affecting the fatigue life of the tire.

[0048] Furthermore, the sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500 is greater than 1.1 times the cross-sectional width of the second belt bundle 320 in the vertical direction.

[0049] Specifically, the sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500 is h1 + c. The cross-sectional width of the second belt bundle 320 in the vertical direction is L. The sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500 is greater than 1.1 times the cross-sectional width of the second belt bundle 320 in the vertical direction, that is, (h1 + c) / L > 1.1. This ensures that the winding belt bundle 500 can completely wrap both ends of the second belt bundle 320 and the third belt bundle 330, achieving the effect of enhancing the shoulder rigidity.

[0050] Preferably, the sum of the cross-sectional widths of the two winding belt bundles 500 in the vertical direction and the distance between the two winding belt bundles 500 is less than 1.2 times the cross-sectional width of the second belt bundle 320 in the vertical direction.

[0051] Specifically, the sum of the vertical cross-sectional widths of the two wrapping belts 500 and the spacing between them is h1 + c. The vertical cross-sectional width of the second belt 320 is L. The sum of the vertical cross-sectional widths of the two wrapping belts 500 and the spacing between them is less than 1.2 times the vertical cross-sectional width of the second belt 320, i.e., (h1 + c) / L < 1.2. This ensures that the wrapping belt 500 covers an appropriate width above the wrapping cloth, without significantly affecting shoulder heating.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tire crown cord structure, comprising a crown upper layer rubber (100), a crown lower layer rubber (200), a belt layer (300), a tire cushion rubber (600) and a carcass, wherein the belt layer (300) comprises a first belt (310), a second belt (320) and a third belt (330) stacked from top to bottom, characterized in that: Also includes a buffer layer (400) and a wrapping belt (500); The buffer layer (400) is arranged between the first belt (310) and the second belt (320), and the two wrapping belts (500) are symmetrically wrapped around the shoulders of the first belt (310); The buffer layer (400) comprises a buffer film (410) and a nylon wrapping cloth (420), wherein the two nylon wrapping cloths (420) are respectively arranged on both sides of the buffer film (410) and abut against the buffer film (410); The buffer film (410) is arranged in the middle of the crown, the laminating starting points of the nylon wrapping cloth (420) are the two end points of the buffer film (410), and the nylon wrapping cloth (420) is wound around the crown edge at zero degrees.

2. The tire crown cord structure according to claim 1, characterized in that: The cross-sectional width of the crown upper layer rubber (100) in the vertical direction is K, and the cross-sectional width of the buffer rubber sheet (410) in the vertical direction ranges from K / 12 to K / 6.

3. The tire crown cord structure according to claim 1 or 2, characterized in that: The cross-sectional width of the buffer layer (400) in the vertical direction is greater than 1.2 times the cross-sectional length of the second belt (320) in the vertical direction.

4. The tire crown cord structure according to claim 1 or 2, characterized in that: The cross-sectional width of the buffer layer (400) in the vertical direction is less than 1.5 times the cross-sectional length of the second belt (320) in the vertical direction.

5. The tire crown cord structure according to claim 2, characterized in that: The distance between the two winding belts (500) is greater than K / 3, and the distance between the two winding belts (500) is less than K / 2.

6. The tire crown cord structure according to claim 1 or 2, characterized in that: The cross-sectional width of the buffer layer (400) in the vertical direction is greater than the sum of the cross-sectional widths of the two wrapping belts (500) in the vertical direction and the distance between the two wrapping belts (500).

7. The tire crown cord structure according to claim 1 or 2, characterized in that: The sum of the cross-sectional width of the two wrapping belts (500) in the vertical direction and the distance between the two wrapping belts (500) is greater than 1.1 times the cross-sectional width of the second belt (320) in the vertical direction.

8. The tire crown cord structure according to claim 1 or 2, characterized in that: The sum of the cross-sectional width of the two wrapping belts (500) in the vertical direction and the distance between the two wrapping belts (500) is less than 1.2 times the cross-sectional length of the second belt (320) in the vertical direction.

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