CN216231490U - High-performance tire crown and all-steel radial tire - Google Patents

Abstract

The application relates to the field of tire manufacturing, in particular to an all-steel radial tire with a high-performance tire crown profile. A tire crown is characterized in that the tire crown profile from the intersection point of a tire equatorial plane and the tire crown profile to the initial point of a tire shoulder is a first crown arc and a second crown arc in sequence; the center of the first crown arc is inward, the center of the second crown arc is outward, the two crown arcs are tangent, and the centers of the two crown arcs are respectively positioned at the inner side and the outer side of the crown profile; the first segment crown arc outer diameter R1 and the second segment crown arc outer diameter R2 have a relationship of R2> R1; the horizontal width a of the crown arc of the second section and the horizontal width b of the crown have the relation that a/b is more than or equal to 0.3 and less than or equal to 0.6. The contour of the tire crown is increased, the length of the grounding mark of the shoulder of the tire is increased, the production cost can not be increased, and meanwhile, the wear resistance and the durability of the tire are improved.

Description

High-performance tire crown and all-steel radial tire

Technical Field

The application relates to the field of tire manufacturing, in particular to a high-performance tire crown and an all-steel radial tire.

Background

In recent years, with the coming of load-limiting policies in the automotive field and the change of vehicle types, all-steel radial tires are used as an important part of automobiles, and the requirements on wear resistance and durability are higher and higher. The shape of the footprint and the ground contact stress of an all-steel radial tire are one of the main factors influencing the wear resistance and the durability of the tire, and the superiority and inferiority of the performance are closely related to the service life of the tire.

When the automobile is limited in load, the load factor of the all-steel radial tire is reduced, the grounding trace shape of the all-steel radial tire has the condition that the width of the grounding trace of a shoulder is short, so that the stress distribution is uneven in the grounding process, the crown deformation in the tire rotating process is aggravated, the heat generation of a tire crown is increased, and the wear resistance and the durability of the tire are further influenced.

For the case of short tire shoulder footprint, the current common approach is to increase the shoulder thickness. This method causes an increase in the thickness of the shoulder portion of the tire, an increase in heat generation, an influence on the durability thereof, and an increase in the production cost.

Disclosure of Invention

In order to solve the above-mentioned technical problem, the present application aims to provide a high-performance tire crown having a profile that increases the length of the footprint of the shoulder of the tire, enabling the wear and endurance performance of the tire to be improved without increasing the production costs.

In order to achieve the above object, the present application adopts the following technical solutions:

a high-performance tire crown is characterized in that the tire crown profile from the intersection point of a tire equatorial plane and the tire crown profile to the initial point of a tire shoulder is a first crown arc section and a second crown arc section in sequence; the center of the first crown arc is inward, the center of the second crown arc is outward, the two crown arcs are tangent, and the centers of the two crown arcs are respectively positioned at the inner side and the outer side of the crown profile; the first segment crown arc outer diameter R1 and the second segment crown arc outer diameter R2 have a relationship of R2> R1; the horizontal width a of the crown arc of the second section and the horizontal width b of the crown have the relation that a/b is more than or equal to 0.3 and less than or equal to 0.6.

Preferably, the first-section crown arc outer diameter R1 and the second-section crown arc outer diameter R2 have the ratio of 2.4 ≦ R2/R1 ≦ 2.6.

Preferably, the horizontal width a of the crown arc of the second section and the horizontal width b of the crown have the relationship of a/b being less than or equal to 0.3 and less than or equal to 0.4.

In a specific embodiment, the first section crown arc outer diameter R1 is 680mm, and the second section crown arc outer diameter R2 is 1700 mm; the horizontal width a of the second crown arc is 40mm and the horizontal width b of the crown is 120 mm.

In a specific embodiment, the first-stage crown arc outer diameter R1 is 500mm, and the second-stage crown arc outer diameter R2 is 1200 mm; the horizontal width a of the second crown arc is 40mm and the horizontal width b of the crown is 100 mm.

In a specific embodiment, the first-stage crown arc outer diameter R1 is 800mm, and the second-stage crown arc outer diameter R2 is 2000 mm; the horizontal width a of the second crown arc is 45mm and the horizontal width b of the crown is 120 mm.

Further, the application also discloses an all-steel radial tire, and the crown of the tire adopts the high-performance tire crown.

By adopting the technical scheme, the wear resistance and durability of the tire are improved by optimizing the tire crown profile under the condition of not increasing the cost. It is worth mentioning that the technical scheme is applied to mold processing, the manufacturing process is the same as that of the existing tire, and the tire is easy to implement, strong in operability and practical.

Drawings

FIG. 1 is a cross-sectional view of a tire crown profile as described herein; the outline of the crown consists of two arcs, and the circle centers are arranged at two sides of the outline.

FIG. 2 is a cross-sectional view of a prior art tire crown profile; the outline of the crown consists of two arcs, and the circle centers are positioned at the same side of the outline.

FIG. 3 is a ground contact pressure footprint of the test tire and the standard tire of example 1; the upper panel is a test tire and the lower panel is a standard tire.

FIG. 4 is a footprint of the test tire and the standard tire of example 2; the upper panel is a test tire and the lower panel is a standard tire.

FIG. 5 is a ground contact pressure footprint of the test tire and the standard tire of example 3; the upper panel is a test tire and the lower panel is a standard tire.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in FIG. 1, the crown profile of the present invention includes a first arc segment and a second arc segment. Point A is the intersection point of the tire equatorial plane and the tire crown outline, and point B is the starting point of the tire shoulder; the crown profile from A to B is a first crown arc and a second crown arc in sequence. The first section of crown arc is tangent to the second section of arc, and the circle centers are respectively positioned at the inner side and the outer side of the crown profile.

Example 1

The outer diameter R1 of the first section of the crown arc of the test tire is 680mm (the circle center faces inwards), the outer diameter R2 of the second section of the crown arc of the test tire is 1700mm (the circle center faces outwards), and the relation of R2/R1 is more than or equal to 2.4 and less than or equal to 2.6 is realized. The outer diameter R1 of the first crown arc of the standard tire is 680mm (the circle center faces inwards), the second crown arc R2 is a straight line, and R2/R1 is infinite.

The horizontal width a of the crown arc of the second section of the test tire is 40mm, and the horizontal width b of the crown is 120mm, and the relationship of a/b is more than or equal to 0.3 and less than or equal to 0.4 is realized. The horizontal width a of the crown arc of the second section of the standard tire is 35mm, the horizontal width b of the crown is 120mm, and a/b is 0.29.

Example 2

The outer diameter R1 of the first section of the crown of the test tire is 500mm (the circle center faces inwards), the outer diameter R2 of the second section of the crown is 1200mm (the circle center faces outwards), and the relation of R2/R1 is more than or equal to 2.4 and less than or equal to 2.6 is realized. The outer diameter R1 of the first crown arc of the standard tire is 500mm (the circle center is inward), the second crown arc R2 is a straight line, and R2/R1 is infinite.

The horizontal width a of the crown arc of the second section of the test tire is 40mm, and the horizontal width b of the crown is 100mm, and the relationship of a/b is more than or equal to 0.3 and less than or equal to 0.4. The horizontal width a of the crown arc of the second section of the standard tire is 28mm, the horizontal width b of the crown is 100mm, and a/b is 0.28.

Example 3

The outer diameter R1 of the first section of the crown of the test tire is 800mm (the circle center faces inwards), the outer diameter R2 of the second section of the crown is 2000mm (the circle center faces outwards), and the relation of R2/R1 being more than or equal to 2.4 and less than or equal to 2.6 is achieved. The standard tire has a first crown outer diameter R1 of 900mm (with the center facing inwards), a second crown outer diameter R2 of 650mm (with the center facing inwards), and R2/R1 of 0.72.

The horizontal width a of the crown arc of the second section of the test tire is 45mm, and the horizontal width b of the crown is 120mm, and the relationship of a/b is more than or equal to 0.3 and less than or equal to 0.4 is realized. The horizontal width a of the crown arc of the second section of the standard tire is 60mm, the horizontal width b of the crown is 120mm, and a/b is 0.5.

The ground contact pressure impression test is carried out by adopting the tire with the tire crown outline structure. The test tire is different from the all-steel radial tire in the prior art except that the tire crown profile is different, other structures are completely the same, the tire is installed on a rim of the same standard, a ground pressure impression test is carried out by adopting standard load and air pressure, and the test data pair is shown in a table 1. The result shows that the technology can increase the length of the shoulder mark of the contact patch shape of the all-steel radial tire, the shape of the mark in the tire grounding process is fuller, the 'squareness' (the ratio of the tire mark grounding area to the product of the length of the short shaft and the length of the long shaft of the tire grounding), the average pressure is lower, and the wear resistance of the tire is better.

Table 1: ground pressure footprint test

Further, the present application has conducted endurance tests using tires having the above-described crown profile structure. The test tires and prior art all-steel radial tires were mounted on the same standard rim and the durability of the tires was tested according to international standards using the same load, air pressure and running speed until the tires were damaged. The experimental data pairs are shown in table 2. The result shows that the technology can ensure that the stress distribution is more uniform in the tire grounding process, the crown deformation in the tire driving process is reduced, the crown heat generation is reduced, and the durability of the tire is further improved.

Table 2: durability test

The method for manufacturing the all-steel radial tire with the tire crown profile structure is mainly realized by processing a tire pattern mold, and the forming method of the all-steel radial tire is the same as that of the existing tire. And vulcanizing the tire after molding, inspecting and packaging.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. A high-performance tire crown is characterized in that the tire crown profile from the intersection point of a tire equatorial plane and the tire crown profile to the initial point of a tire shoulder is a first crown arc section and a second crown arc section in sequence; the center of the first crown arc is inward, the center of the second crown arc is outward, the two crown arcs are tangent, and the centers of the two crown arcs are respectively positioned at the inner side and the outer side of the crown profile; the first segment crown arc outer diameter R1 and the second segment crown arc outer diameter R2 have a relationship of R2> R1; the horizontal width a of the crown arc of the second section and the horizontal width b of the crown have the relation that a/b is more than or equal to 0.3 and less than or equal to 0.6.

2. A high performance tire tread band as claimed in claim 1, wherein the first crown arc outer diameter R1 and the second crown arc outer diameter R2 have a value of 2.4R 2/R1 2.6.

3. A high performance tire tread band as claimed in claim 1, wherein the horizontal width a of the crown of the second crown segment and the horizontal width b of the crown have a relationship a/b of 0.3. ltoreq.0.4.

4. A high performance tire crown as claimed in claim 1, wherein said first crown arc outer diameter R1=680mm and said second crown arc outer diameter R2=1700 mm; the horizontal width of the second segment crown arc a =40mm and the crown horizontal width b =120 mm.

5. A high performance tire crown as claimed in claim 1, wherein said first crown arc outer diameter R1=500mm and said second crown arc outer diameter R2=1200 mm; the horizontal width of the second segment crown arc a =40mm and the crown horizontal width b =100 mm.

6. A high performance tire crown as claimed in claim 1, wherein said first crown arc outer diameter R1=800mm and said second crown arc outer diameter R2=2000 mm; the horizontal width of the second segment crown arc a =45mm and the crown horizontal width b =120 mm.

7. An all-steel radial tire, characterized in that the crown of the tire adopts a high-performance tire crown as claimed in any one of claims 1-6.

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