A passenger car tire bead profile and a radial tire

Abstract

This invention belongs to the field of tire technology, specifically relating to a passenger car tire bead profile and a radial tire. The bead profile of this invention includes first and second arc-shaped segments, and a pressure-increasing ring belt located between them. The pressure-increasing ring belt includes a first transition arc segment, a second transition arc segment, and a third transition arc segment arranged sequentially. The first arc segment and the first transition arc segment are tangent at point A, and the second arc segment and the third transition arc segment are tangent at point B. The intersection of the first and third transition arc segments is point S, which is also the intersection of a straight line L1 and a virtual arc. L1 is a straight line located 3-10 mm above the rim mating diameter D, and the virtual arc is formed by shifting the second arc segment to the right by 0.5-2 mm. This invention adds a pressure-increasing ring belt to the bead profile, which increases the pressure between the tire and the rim, thereby improving tightness and effectively reducing the risk of tire slippage or even separation from the rim during sharp turns and sudden braking.

Description

Technical Field

[0001] This invention belongs to the field of tire technology, specifically relating to a passenger car tire bead profile and a radial tire. Background Technology

[0002] With the development of the automotive industry, passenger car tires have reached speed ratings of Y (300 km / h) and above. To improve the safety and stability of tires during cornering and braking at high speeds, it is necessary to continuously enhance the tightness and stability of the tire bead's fit into the rim (e.g., Figure 1 To reduce the risk of air leakage and slippage, the design of the bead curve in tire profile design is crucial for tire safety and stability. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a passenger car tire bead profile and a radial tire. This invention adds a pressure-increasing ring to the bead profile. When the tire is embedded in the rim at the tire rim position, this pressure-increasing ring increases the pressure between the tire and the rim, thereby improving tightness and effectively reducing the risk of tire slippage or even separation from the rim during sharp turns and sudden braking.

[0004] To achieve the above technical objectives, the technical solution adopted in the embodiments of the present invention is as follows: In a first aspect, embodiments of the present invention provide a passenger car tire bead profile, including a first arc segment and a second arc segment, with a pressure-boosting ring between the first arc segment and the second arc segment. The pressure-boosting ring includes a first transition arc segment, a second transition arc segment, and a third transition arc segment. The upper end of the first transition arc segment is smoothly connected to the first arc segment, the lower end of the first transition arc segment is smoothly connected to the upper end of the second transition arc segment, the lower end of the second transition arc segment is smoothly connected to the upper end of the third transition arc segment, and the lower end of the third transition arc segment is smoothly connected to the upper end of the second arc segment. The first arc segment is tangent to the first transition arc segment at point A, and the second arc segment is tangent to the third transition arc segment at point B; The intersection of the first transition arc segment and the third transition arc segment is point S. At the same time, point S is also the intersection of the straight line L1 and the virtual arc. L1 is a straight line located 3-10mm above the rim engagement diameter D. The virtual arc is formed by shifting the second arc segment to the right by 0.5-2mm.

[0005] Furthermore, the centers of the first arc segment and the first transition arc segment are located on the same side of the tangent point A; The centers of the second arc segment and the third transition arc segment are located on both sides of the tangency point B.

[0006] Furthermore, the lower end of the first transition arc segment is tangent to the upper end of the second transition arc segment at point E, and the centers of the first transition arc segment and the second transition arc segment are located on both sides of the tangency point E. The lower end of the second transition arc segment is tangent to the upper end of the third transition arc segment at point F, and the centers of the second and third transition arc segments are located on opposite sides of the tangency point F.

[0007] Furthermore, the radius R1 of the first transition arc segment is 5-10 mm; The radius of the second transition arc segment is R2 = 2-8 mm; The radius of the third transition arc segment is R3 = 10-18 mm.

[0008] Furthermore, a sealing line is designed on the inclined surface where the tire bead mates with the rim, at a position 5-6 mm from the edge of the tire bead. The sealing line is raised.

[0009] Furthermore, the sealing line is a V-shaped protrusion with a bottom width of 0.3-0.8 mm and a height of 0.2-0.5 mm.

[0010] Furthermore, the sealing line is an arc-shaped protrusion with a bottom width of 0.3-0.8 mm and a height of 0.2-0.5 mm.

[0011] Secondly, embodiments of the present invention provide a radial tire for passenger vehicles, wherein the tire bead has the bead profile described in the first aspect.

[0012] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: (1) The present invention adds a pressure ring belt in the profile of the tire bead. When the tire is embedded in the rim, the pressure ring belt will increase the pressure of the tire and the rim, thereby improving the tightness. When the car makes a sharp turn or brakes suddenly, it can effectively reduce the risk of the tire slipping or even separating from the rim.

[0013] (2) The present invention adds a sealing line to the outline of the tire bead. The sealing line can enhance the airtightness, prevent the loss of internal inflation pressure, and reduce the risk of air leakage and spillage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the tire and rim fitting in an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the conventional tire bead profile curve in Comparative Example 1.

[0016] Figure 3 This is a schematic diagram of the sub-mouth profile curve designed with a pressure boosting ring and a sealing line in Example 1.

[0017] Figure 4 This is an enlarged view of the sealing line structure in Example 1.

[0018] Figure 5 This is an enlarged view of the sealing line structure in Example 2.

[0019] Figure 6 Example 1: The profile curve of the rim with a pressure boosting ring and a sealing line, and the pressure distribution diagram of the fit between the rim and the wheel.

[0020] Figure 7 This is a comparative example 1, showing the pressure distribution diagram of the conventional sub-rim profile curve and the rim fit.

[0021] Explanation of reference numerals in the attached diagram: 1-First arc segment; 2-Second arc segment; 3-Pressure booster ring; 3.1-First transition arc segment; 3.2-Second transition arc segment; 3.3-Third transition arc segment; 4-Sealing line; 5-First pressure bearing area; 6-Second pressure bearing area; 7-Third pressure bearing area; 8-Fourth pressure bearing area; 9-Tire; 10-Rim. Detailed Implementation

[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "inner" and "outer", "upper" and "lower", "left" and "right" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention.

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] Example 1 like Figure 3 As shown, a passenger car tire bead profile includes a first arc segment 1 and a second arc segment 2, wherein the radius of the first arc segment 1 is R. B =8mm, radius R of the second arc segment 2 A =10mm.

[0025] A pressure-boosting ring 3 is provided between the first arc segment 1 and the second arc segment 2. The pressure-boosting ring 3 includes a first transition arc segment 3.1, a second transition arc segment 3.2, and a third transition arc segment 3.3. The upper end of the first transition arc segment 3.1 is smoothly connected to the first arc segment 1, the lower end of the first transition arc segment 3.1 is smoothly connected to the upper end of the second transition arc segment 3.2, the lower end of the second transition arc segment 3.2 is smoothly connected to the upper end of the third transition arc segment 3.3, and the lower end of the third transition arc segment 3.3 is smoothly connected to the upper end of the second arc segment 2. The first arc segment 1 is tangent to the first transition arc segment 3.1 at point A, and the second arc segment 2 is tangent to the third transition arc segment 3.3 at point B; The intersection of the first transition arc segment 3.1 and the third transition arc segment 3.3 is point S. At the same time, point S is also the intersection of the straight line L1 and the virtual arc. L1 is a straight line located 8.5mm above the rim engagement diameter D. The virtual arc is formed by shifting the second arc segment 2 to the right by 1mm.

[0026] Specifically, the centers of the first arc segment 1 and the first transition arc segment 3.1 are located on the same side of the tangent point A; The centers of the second arc segment 2 and the third transition arc segment 3.3 are located on both sides of the tangent point B.

[0027] The lower end of the first transition arc segment 3.1 is tangent to the upper end of the second transition arc segment 3.2 at point E, and the centers of the first transition arc segment 3.1 and the second transition arc segment 3.2 are located on opposite sides of the point of tangency E. The lower end of the second transition arc segment 3.2 and the upper end of the third transition arc segment 3.3 are tangent at point F, and the centers of the second transition arc segment 3.2 and the third transition arc segment 3.3 are located on both sides of the point of tangency F.

[0028] The radius of the first transition arc segment 3.1 is R1 = 5 mm; The radius of the second transition arc segment 3.2 is R2 = 4 mm; The radius of the third transition arc segment 3.3 is R3=14mm.

[0029] A sealing line 4 is designed on the inclined surface where the tire bead meets the rim, 6mm away from the edge of the tire bead. The sealing line 4 is raised.

[0030] like Figure 4 As shown, the sealing line 4 is a V-shaped protrusion with a bottom width of 0.3 mm and a height of 0.25 mm, and the inflation pressure is 340 kPa.

[0031] Example 2 like Figure 3 As shown, a passenger car tire bead profile includes a first arc segment 1 and a second arc segment 2, wherein the radius of the first arc segment 1 is R. B =8mm, radius R of the second arc segment 2A =10mm.

[0032] A pressure-boosting ring 3 is provided between the first arc segment 1 and the second arc segment 2. The pressure-boosting ring 3 includes a first transition arc segment 3.1, a second transition arc segment 3.2, and a third transition arc segment 3.3. The upper end of the first transition arc segment 3.1 is smoothly connected to the first arc segment 1, the lower end of the first transition arc segment 3.1 is smoothly connected to the upper end of the second transition arc segment 3.2, the lower end of the second transition arc segment 3.2 is smoothly connected to the upper end of the third transition arc segment 3.3, and the lower end of the third transition arc segment 3.3 is smoothly connected to the upper end of the second arc segment 2. The first arc segment 1 is tangent to the first transition arc segment 3.1 at point A, and the second arc segment 2 is tangent to the third transition arc segment 3.3 at point B; The intersection of the first transition arc segment 3.1 and the third transition arc segment 3.3 is point S. At the same time, point S is also the intersection of the straight line L1 and the virtual arc. L1 is a straight line located 8.5mm above the rim engagement diameter D. The virtual arc is formed by shifting the second arc segment 2 to the right by 1mm.

[0033] Specifically, the centers of the first arc segment 1 and the first transition arc segment 3.1 are located on the same side of the tangent point A; The centers of the second arc segment 2 and the third transition arc segment 3.3 are located on both sides of the tangent point B.

[0034] The lower end of the first transition arc segment 3.1 is tangent to the upper end of the second transition arc segment 3.2 at point E, and the centers of the first transition arc segment 3.1 and the second transition arc segment 3.2 are located on opposite sides of the point of tangency E. The lower end of the second transition arc segment 3.2 and the upper end of the third transition arc segment 3.3 are tangent at point F, and the centers of the second transition arc segment 3.2 and the third transition arc segment 3.3 are located on both sides of the point of tangency F.

[0035] The radius of the first transition arc segment 3.1 is R1 = 5 mm; The radius of the second transition arc segment 3.2 is R2 = 4 mm; The radius of the third transition arc segment 3.3 is R3=14mm.

[0036] A sealing line 4 is designed on the inclined surface where the tire bead meets the rim, 6mm away from the edge of the tire bead. The sealing line 4 is raised.

[0037] like Figure 5 As shown, the sealing line 4 is an arc-shaped protrusion with a bottom width of 0.5 mm and a height of 0.25 mm.

[0038] Comparative Example 1 like Figure 2The diagram illustrates a passenger car tire bead profile, comprising a first arc-shaped segment 1 and a second arc-shaped segment 2 smoothly connected. The first arc-shaped segment 1 and the second arc-shaped segment 2 are tangent at the connection point, and the centers of the first arc-shaped segment 1 and the second arc-shaped segment 2 are located on opposite sides of the tangency point. The radius of the first arc-shaped segment 1 is R. B =8mm, radius R of the second arc segment 2 A =10mm.

[0039] The pressure-boosting ring 3 and sealing line 4 in Examples 1 and 2 are added based on the sub-mouth contour in Comparative Example 1. The first arc segment 1 and the second arc segment 2 in Comparative Example 1 are tangent at the connection point, and the centers of the first arc segment 1 and the second arc segment 2 are located on both sides of the tangency point. The steps for determining the pressure-boosting ring 3 in Examples 1 and 2 are as follows: Draw a straight line L1 at a distance H=8.5mm above the rim mating diameter D. The second arc segment 2 is shifted 1mm to the right to form a virtual arc. The intersection of the virtual arc and the straight line L1 is point S. Through point S, tangent arcs are drawn to the first arc segment 1 and the second arc segment 2 respectively. The first transition arc segment 3.1 with radius R1=5mm is tangent to the first arc segment 1 at point A. The third transition arc segment 3.3 with radius R3=14mm is tangent to the second arc segment 2 at point B. Then, the third transition arc segment 3.3 and the first transition arc segment 3.1 are cut out to form a second transition arc segment 3.2 with radius R2=4mm. The lower end of the first transition arc segment 3.1 is tangent to the upper end of the second transition arc segment 3.2 at point E. The lower end of the second transition arc segment 3.2 is tangent to the upper end of the third transition arc segment 3.3 at point F. The first transition arc segment 3.1, the second transition arc segment 3.2 and the third transition arc segment 3.3 form a protruding pressure ring 3.

[0040] A schematic diagram of the fit between a passenger car radial tire and a wheel rim is shown below. Figure 1 As shown, a simulation analysis was performed on the pressure of a passenger car radial tire with the rim profile shown in Example 1 and Comparative Example 1. The results are shown in [the table / document / etc.]. Figure 6 and Figure 7 .

[0041] Figure 6 and Figure 7 The comparison shows that when tire 9 is fitted with rim 10, Figure 6 In Example 1, the pressure-bearing area of ​​the sub-mouth profile is changed due to the addition of the pressure-increasing ring 3 and the sealing line 4. Figure 7 Two of them were added as Figure 6 Of the four, Figure 6 and Figure 7 Each includes a first pressure-bearing zone 5 and a third pressure-bearing zone 7, and their pressure-bearing values ​​are basically the same. Figure 6 The second pressure-bearing zone 6 is generated by the pressure-boosting ring belt 3 and is closer to the rim 10 than the first pressure-bearing zone 5, while also making... Figure 6 The first pressure zone 5 in the middle Figure 7 The first pressure-bearing zone 5 extends upwards, increasing the pressure-bearing area; the fourth pressure-bearing zone 8 is generated by the sealing line 4 and is closer to the inner edge of the rim than the third pressure-bearing zone 7, thus providing better airtightness. Therefore, the tire bead in Example 1 has better sealing and rim fit tightness than the tire bead in Comparative Example 1, resulting in higher tire safety performance.

[0042] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A passenger car tire bead profile, characterized in that, It includes a first arc segment (1) and a second arc segment (2), with a pressure-boosting ring (3) between the first arc segment (1) and the second arc segment (2). The pressure-boosting ring (3) includes a first transition arc segment (3.1), a second transition arc segment (3.2) and a third transition arc segment (3.3). The upper end of the first transition arc segment (3.1) is smoothly connected to the first arc segment (1), the lower end of the first transition arc segment (3.1) is smoothly connected to the upper end of the second transition arc segment (3.2), the lower end of the second transition arc segment (3.2) is smoothly connected to the upper end of the third transition arc segment (3.3), and the lower end of the third transition arc segment (3.3) is smoothly connected to the upper end of the second arc segment (2). The first arc segment (1) is tangent to the first transition arc segment (3.1) at point A, and the second arc segment (2) is tangent to the third transition arc segment (3.3) at point B; The intersection of the first transition arc segment (3.1) and the third transition arc segment (3.3) is point S. At the same time, point S is also the intersection of the straight line L1 and the virtual arc. L1 is a straight line located 3-10mm above the rim engagement diameter D. The virtual arc is formed by the second arc segment (2) shifting to the right by 0.5-2mm. The centers of the first arc segment (1) and the first transition arc segment (3.1) are located on the same side of the tangent point A; The centers of the second arc segment (2) and the third transition arc segment (3.3) are located on both sides of the tangency point B; The lower end of the first transition arc segment (3.1) is tangent to the upper end of the second transition arc segment (3.2) at point E, and the centers of the first transition arc segment (3.1) and the second transition arc segment (3.2) are located on both sides of the tangency point E. The lower end of the second transition arc segment (3.2) is tangent to the upper end of the third transition arc segment (3.3) at point F, and the centers of the second transition arc segment (3.2) and the third transition arc segment (3.3) are located on both sides of the tangency point F.

2. The passenger car tire bead profile according to claim 1, characterized in that, The radius of the first transition arc segment (3.1) is R1 = 5-10 mm; The radius of the second transition arc segment (3.2) is R2 = 2-8 mm; The radius of the third transition arc segment (3.3) is R3 = 10-18 mm.

3. The passenger car tire bead profile according to claim 1 or 2, characterized in that, A sealing line (4) is designed on the inclined surface where the tire bead meets the rim, at a distance of 5-6 mm from the edge of the tire bead. The sealing line (4) is raised.

4. The passenger car tire bead profile according to claim 3, characterized in that, The sealing line (4) is a V-shaped protrusion with a bottom width of 0.3-0.8 mm and a height of 0.2-0.5 mm.

5. The passenger car tire bead profile according to claim 3, characterized in that, The sealing line (4) is an arc-shaped protrusion with a bottom width of 0.3-0.8 mm and a height of 0.2-0.5 mm.

6. A radial tire for passenger cars, characterized in that, The tire bead has the bead profile as described in any one of claims 1-5.

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