Design method of all-steel radial railway tire

Abstract

This invention discloses a design method for an all-steel radial railway tire. The tire has a centrally symmetrical cross-section and includes an external contour structure, an internal contour structure, and the thickness of key components. The method includes the following steps: S1: Determine the tire's outer diameter and end face width, and calculate the tire's section height based on the outer diameter; S2: Design the external contour structure, which includes the crown contour line, shoulder contour line, sidewall contour line, and bead contour line; S3: Design the thickness of key components, which include the crown, shoulder, sidewall, and bead; S4: Design the internal contour structure, which includes the inner contour arc of the crown, shoulder, sidewall, and bead. After determining the tire's outer diameter and section width, the remaining parameters can be automatically calculated using coefficients. The entire process is not only time-efficient but also reduces the requirements for designers.

Description

Technical Field

[0001] This invention belongs to the field of tire size design technology, specifically relating to a design method for an all-steel radial railway tire. Background Technology

[0002] In existing technologies, tire size design typically requires experienced designers to refer to existing tire dimensions. After the design is completed, multiple tests are needed to ensure that the tire meets speed and load-bearing capacity requirements. The entire design process is not only time-consuming and highly demanding on the designer's experience, but this design method is also not effectively taught to new designers. Summary of the Invention

[0003] This invention proposes a design method for all-steel radial rail tires, which not only simplifies the design time for tire dimensions but also facilitates the transfer of design methods.

[0004] Therefore, the technical solution adopted by this invention is as follows: a design method for an all-steel radial rail tire, wherein the tire has a centrally symmetrical cross-section, and the tire includes an outer contour structure, an inner cavity contour structure, and the thickness of key parts, comprising the following steps:

[0005] S1: Determine the tire outer diameter and tire end face width. Calculate the tire section height based on the tire outer diameter using the following formula:

[0006]

[0007] in, The outer diameter of the tire. The nominal diameter of the rim. This refers to the tire end face height. This is the amount of interference fit;

[0008] S2: Design the external contour structure, which includes the crown contour line, shoulder contour line, sidewall contour line and bead contour line. The crown contour line and shoulder contour line are connected by direct intersection or rounded intersection lines.

[0009] S3: Design the thickness of key components, including the tire crown, tire shoulder, tire sidewall, and tire bead;

[0010] S4: Design the inner cavity contour structure, which includes the inner contour arc of the tire crown, the inner contour arc of the tire shoulder, the inner contour arc of the tire sidewall, and the inner contour arc of the tire bead.

[0011] As a preferred embodiment of the above scheme, in step S2, the tire crown contour line is an arc, and the center of the arc is located on the center line of the tire pavement. The radius and horizontal width of the arc are calculated using the following formula:

[0012]

[0013] in The radius of the tire crown outline arc. The width of the tread profile arc in the horizontal direction. The width of the tire end face. and All are design coefficients for the curvature of the tire crown contour;

[0014] The tire crown outline has at least four equidistant grooves.

[0015] Further preferably, in step S2, the tire shoulder profile is designed as a straight line or an arc. When designed as an arc, the diameter of the tire shoulder profile arc is calculated using the following formula:

[0016]

[0017] in, The diameter of the shoulder profile arc. The design coefficient for the curvature of the tire shoulder profile.

[0018] Further preferably, in step S2, the sidewall profile is composed of three tangent arcs, from top to bottom: a first arc, a second arc, and a third arc. The first arc directly intersects the shoulder profile, or the tangent of the first arc intersects the shoulder profile. The centers of the first and second arcs are both on a horizontal axis, which is a straight line in the horizontal direction at the widest point of the sidewall. The radii of the first, second, and third arcs are calculated using the following formula:

[0019]

[0020] in, Let the radius of the first arc be . The radius of the second arc. The radius of the third arc. , and All of these are design coefficients for the tire sidewall profile.

[0021] Further preferably, in step S2, the bead outline is designed as a straight line, with a rounded connection to the sidewall outline. The angle between the straight line of the bead outline and the horizontal direction is between 22° and 25°. The horizontal width of the bead outline is calculated using the following formula:

[0022]

[0023] in, This refers to the horizontal width of the tire bead outline. This is the design coefficient for the tire bead outline.

[0024] Further preferably, in S3, the thickness of the tire crown is the thickness at the center line position, calculated using the following formula:

[0025]

[0026] in, For tire crown thickness, The depth of the pattern groove, This refers to the design coefficient for tire crown thickness.

[0027] The thickness of the tire shoulder is the thickness at the thickest point of the tire shoulder apex, calculated using the following formula:

[0028]

[0029] in, This refers to the shoulder thickness. This refers to the design coefficient for tire shoulder thickness.

[0030] The thickness of the tire sidewall is the thickness of the thinnest part of the tire sidewall, calculated using the following formula:

[0031]

[0032] in, Sidewall thickness, This refers to the design coefficient for tire sidewall thickness.

[0033] The thickness of the tire bead is the thickness at its thickest point, calculated using the following formula:

[0034]

[0035] in, This refers to the bead thickness. This is the design factor for tire bead thickness.

[0036] Further preferably, in S4, the inner contour arc of the tire crown is designed as an arc, and the center of the inner contour arc is located on the center line of the tire section. The radius of the arc is calculated by the following formula:

[0037]

[0038] in, The radius of the inner contour arc of the tire crown. This is the design coefficient for the inner contour arc of the tire crown.

[0039] Further preferably, in S4, the inner contour arc of the tire shoulder is designed as an arc, and the inner contour arc of the tire shoulder is tangent to the inner contour arc of the tire crown. The radius of the arc is calculated by the following formula:

[0040]

[0041] in, The radius of the inner contour arc of the tire shoulder. This refers to the design coefficient for the inner contour curve of the tire shoulder.

[0042] Further preferably, in S4, the inner contour arc lines of the tire sidewall are sequentially tangent to the first inner arc line, the second inner arc line, and the inner straight line. The inner straight line is tangent to the second inner arc line and the inner contour line of the tire bead. The radii of the first inner arc line and the second inner arc line are calculated using the following formula:

[0043]

[0044] in, The radius of the first inner arc. The radius of the second inner arc. , All of these are design coefficients for the inner contour arc of the tire sidewall.

[0045] Further preferably, in S4, the inner contour line of the tire bead is designed as an arc, and the radius of the inner contour line of the tire bead is calculated by the following formula:

[0046]

[0047] in, The radius of the inner contour line of the tire bead. This is the design coefficient for the inner contour line of the tire bead.

[0048] The beneficial effects of this invention are: after determining the outer diameter and cross-sectional width of the tire, the remaining parameters can be automatically calculated according to the coefficients. Only moderate corrections are needed to complete the structural design. The whole process is not only time-saving but also easy to teach, while reducing the requirements for designers. Attached Figure Description

[0049] Figure 1 A cross-sectional view of the tire designed for this invention.

[0050] Figure 2 This is a schematic diagram of the external contour structure and the internal cavity contour structure in this invention.

[0051] Figure 3 This is a schematic diagram showing the thickness of a key component in this invention.

[0052] Figure 4 This is a dimensional diagram of the external contour structure in this invention.

[0053] Figure 5 This is a dimensional diagram of the tire sidewall profile in this invention.

[0054] Figure 6 This is a dimensional diagram showing the thickness of key components in this invention.

[0055] Figure 7 The dimensions of the inner cavity contour structure in this invention Figure 1 .

[0056] Figure 8 The dimensions of the inner cavity contour structure in this invention Figure 2 .

[0057] Figure reference numerals: 101, tire crown outline, 102, tire shoulder outline, 103, tire sidewall outline, 104, tire bead outline, L1, tire crown, L2, tire shoulder, L3, tire sidewall, L4, tire bead, 201, inner outline arc of tire crown, 202, inner outline arc of tire shoulder, 203, inner outline arc of tire sidewall, 204, inner outline arc of tire bead. Detailed Implementation

[0058] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0059] A design method for an all-steel radial rail tire, wherein the tire cross-section is centrally symmetrical, and the tire structure includes an external contour structure, an internal cavity contour structure, and the thickness of key components.

[0060] Specifically, such as Figure 2-3 As shown, the external contour structure includes the crown contour line 101, the shoulder contour line 102, the sidewall contour line 103, and the bead contour line 104. The crown contour line 101 and the shoulder contour line 102 are connected by direct intersection or rounded intersection lines with a rounding diameter of less than 5 mm. The internal contour structure includes the inner contour arc line 201 of the crown, the inner contour arc line 202 of the shoulder, the inner contour arc line 203 of the sidewall, and the inner contour arc line 204 of the bead. Key components include the crown L1, the shoulder L2, the sidewall L3, and the bead L4.

[0061] The specific design steps are as follows:

[0062] Step 1: Determine the tire's outer diameter and end face width. Calculate the tire's section height based on the outer diameter using the following formula:

[0063]

[0064] like Figure 1 As shown, where, The outer diameter of the tire. The nominal diameter of the rim. This refers to the tire end face height. This is an interference fit, and the center of the outer diameter is the tire's rotation center. Typically, the tire's outer diameter... Tire end face width Interference fit This is the initial draft.

[0065] Step 2: Design the external contour structure. Specifically:

[0066] like Figure 4 As shown, the tire crown outline 101 is an arc, and the center of the arc is located on the center line of the tire pavement. The radius and horizontal width of the arc are calculated using the following formula:

[0067]

[0068] in The radius of the tire crown outline arc. The width of the tread profile arc in the horizontal direction. The width of the tire end face. and These are all design coefficients for the curvature of the tire crown outline. Typically, The value ranges from 0.7 to 0.9. The value ranges from 0.7 to 0.8.

[0069] At least four tread grooves are designed at equal intervals on the crown outline 101, and the depth of the tread grooves is between 6mm and 12mm, while the width of the tread grooves is actually adjusted.

[0070] The shoulder profile 102 is designed as either a straight line or an arc. When designed as an arc, the diameter of the shoulder profile arc is calculated using the following formula:

[0071]

[0072] in, The diameter of the shoulder profile arc. The design coefficient for the shoulder profile arc is typically... The value ranges from 0.9 to 1.2.

[0073] like Figure 5 As shown, the sidewall profile 104 consists of three tangent arcs, from top to bottom: the first arc, the second arc, and the third arc. The first arc directly intersects the shoulder profile 102, or the tangent of the first arc intersects the shoulder profile. The centers of the first and second arcs are both on a horizontal axis, which is a straight line in the horizontal direction at the widest point of the sidewall. The radii of the first, second, and third arcs are calculated using the following formula:

[0074]

[0075] in, Let the radius of the first arc be . The radius of the second arc. The radius of the third arc. , and These are all design coefficients for the tire sidewall profile, typically. The value ranges from 0.4 to 0.8. The value ranges from 0.7 to 1.1. The value ranges from 0.3 to 0.7.

[0076] The bead outline 104 is designed as a straight line, and the connection point with the sidewall outline 103 is rounded, with a rounding diameter of less than 10mm. The angle between the straight line 104 and the horizontal direction is... Between 22° and 25°, the horizontal width of the bead outline 104 is calculated using the following formula:

[0077]

[0078] in, This refers to the horizontal width of the tire bead outline. This is the design coefficient for the tire bead profile, typically... The value ranges from 0.1 to 0.2.

[0079] like Figure 6 As shown, the thickness of the tire crown L1 is the thickness at the centerline position, calculated using the following formula:

[0080]

[0081] in, For tire crown thickness, The depth of the pattern groove, This is the design coefficient for tire crown thickness, typically... The value ranges from 15 to 20.

[0082] The thickness of the shoulder L2 is the thickness at the thickest point of the shoulder area, calculated using the following formula:

[0083]

[0084] in, This refers to the shoulder thickness. The shoulder thickness design factor is typically... The value ranges from 1.2 to 1.5.

[0085] The thickness of sidewall L3 is the thickness of the thinnest part of the sidewall, calculated using the following formula:

[0086]

[0087] in, Sidewall thickness, This is the design factor for tire sidewall thickness, typically... The value ranges from 0.2 to 0.5.

[0088] The thickness of bead L4 is the thickness of the thickest part of the bead, calculated using the following formula:

[0089]

[0090] in, This refers to the bead thickness. This is the design factor for tire bead thickness, typically... The value ranges from 1.2 to 1.5.

[0091] like Figure 7 As shown, the inner contour arc 201 of the tire crown is designed as an arc, and the center of the inner contour arc is located on the center line of the tire section. The radius of the arc is calculated using the following formula:

[0092]

[0093] in, The radius of the inner contour arc of the tire crown. This is the design coefficient for the inner contour curve of the tire crown, typically... The value ranges from 0.5 to 0.8.

[0094] The inner contour curve 202 of the tire shoulder is designed as an arc, and the inner contour curve of the tire shoulder is tangent to the inner contour curve of the tire crown. The radius of the arc is calculated using the following formula:

[0095]

[0096] in, The radius of the inner contour arc of the tire shoulder. This is the design coefficient for the inner contour curve of the tire shoulder, typically... The value ranges from 0.05 to 0.1.

[0097] like Figure 8 As shown, the inner contour arc 203 of the tire sidewall is tangent to the first inner arc, the second inner arc, and the inner straight line in sequence. The inner straight line is tangent to the second inner arc and the inner contour line of the tire bead. The radii of the first inner arc and the second inner arc are calculated using the following formula:

[0098]

[0099] in, The radius of the first inner arc. The radius of the second inner arc. , These are all design coefficients for the inner contour curve of the tire sidewall; typically, The value ranges from 0.6 to 1.0. The value ranges from 0.3 to 0.7.

[0100] The inner contour line 204 of the tire bead is designed as an arc, and the radius of the inner contour line of the tire bead is calculated by the following formula:

[0101]

[0102] in, The radius of the inner contour line of the tire bead. This is the design coefficient for the inner contour line of the tire bead, typically... The value ranges from 0.2 to 0.6.

[0103] After designing the tire size using the above method, appropriate modifications are made to complete the design of the entire tire structure.

[0104] In existing technologies, designing a tire structure requires at least 2 hours, while using this method, the tire structure dimensions can be designed in just 50 minutes, significantly improving efficiency. The tires designed using this method were then compared with those designed using conventional methods in high-load durability tests. The specific testing method follows GB / T 4501-2023, with the load increased by 10% every 10 hours after 47 hours. The test results are shown in the table below.

[0105] Comparison Table of High-Load Durability Performance Tests

[0106] Test Plan Test load standard Test speed level Standard tire durability Durability of the invention Durability comparison 1 5500kg J 70 h 0 min 86 h 51 min Increased by 24% 2 5500kg J 63 h 23 min 86 h 50 min Increased by 37%

[0107] As can be clearly seen from the table above, the tires designed using this method have better durability under high load conditions than tires designed using conventional methods. Therefore, the load-bearing capacity of the tire structure designed using this method is improved.

Claims

1. A design method for an all-steel radial railway tire, characterized in that, The tire has a centrally symmetrical cross-section and includes an outer contour structure, an inner cavity contour structure, and the thickness of key components, comprising the following steps: S1: Determine the tire outer diameter and tire end face width. Calculate the tire section height based on the tire outer diameter using the following formula: in, The outer diameter of the tire. The nominal diameter of the rim. This refers to the tire end face height. This is the amount of interference fit; S2: Design the external contour structure, which includes the crown contour line (101), the shoulder contour line (102), the sidewall contour line (103), and the bead contour line (104). The crown contour line (101) and the shoulder contour line (102) are connected by direct intersection or rounded intersection lines. S3: Design the thickness of key components, including the tire crown (L1), tire shoulder (L2), tire sidewall (L3) and tire bead (L4). S4: Design the inner cavity contour structure, which includes the inner contour arc of the crown (201), the inner contour arc of the shoulder (202), the inner contour arc of the sidewall (203), and the inner contour arc of the bead (204).

2. The design method for all-steel radial rail tires according to claim 1, characterized in that: In step S2, the tire crown outline (101) is an arc, and the center of the arc is located on the center line of the tire pavement. The radius and horizontal width of the arc are calculated by the following formula: in The radius of the tire crown outline arc. The width of the tread profile arc in the horizontal direction. The width of the tire end face. and All are design coefficients for the curvature of the tire crown contour; The tire crown outline (101) has at least four tread grooves designed at equal intervals.

3. The design method for all-steel radial rail tires according to claim 2, characterized in that: In step S2, the shoulder profile (102) is designed as a straight line or an arc. When designed as an arc, the diameter of the shoulder profile arc is calculated using the following formula: in, The diameter of the shoulder profile arc. The design coefficient for the curvature of the tire shoulder profile.

4. The design method for all-steel radial rail tires according to claim 2, characterized in that: In step S2, the sidewall profile (104) is composed of three tangent arcs, which are the first arc, the second arc, and the third arc from top to bottom. The first arc directly intersects the shoulder profile (102), or the tangent of the first arc intersects the shoulder profile. The centers of the first and second arcs are both on the horizontal axis, which is a straight line in the horizontal direction at the widest position of the sidewall. The radii of the first, second, and third arcs are calculated using the following formula: in, Let the radius of the first arc be . The radius of the second arc. The radius of the third arc. , and All of these are design coefficients for the tire sidewall profile.

5. The design method for all-steel radial rail tires according to claim 2, characterized in that: In step S2, the bead outline (104) is designed as a straight line, and the connection with the sidewall outline (103) is rounded. The angle between the straight line (104) and the horizontal direction is between 22° and 25°. The horizontal width of the bead outline (104) is calculated by the following formula: in, This refers to the horizontal width of the tire bead outline. This is the design coefficient for the tire bead outline.

6. The design method for all-steel radial rail tires according to claim 2, characterized in that: In S3, the thickness of the tire crown (L1) is the thickness at the centerline position, calculated using the following formula: in, For tire crown thickness, The depth of the pattern groove, This refers to the design coefficient for tire crown thickness. The thickness of the shoulder (L2) is the thickness at the thickest point of the shoulder area, calculated using the following formula: in, This refers to the shoulder thickness. This refers to the design coefficient for tire shoulder thickness. The thickness of the sidewall (L3) is the thickness of the thinnest part of the sidewall, calculated using the following formula: in, Sidewall thickness, This refers to the design coefficient for tire sidewall thickness. The thickness of the bead (L4) is the thickness at the thickest point of the bead, calculated using the following formula: in, This refers to the bead thickness. This is the design factor for tire bead thickness.

7. The design method for all-steel radial rail tires according to claim 2, characterized in that: In S4, the inner contour arc (201) of the tire crown is designed as an arc, and the center of the inner contour arc is located on the center line of the tire section. The radius of the arc is calculated by the following formula: in, The radius of the inner contour arc of the tire crown. This is the design coefficient for the inner contour arc of the tire crown.

8. The design method for all-steel radial rail tires according to claim 2, characterized in that: In S4, the inner contour arc of the tire shoulder (202) is designed as an arc, and the inner contour arc of the tire shoulder is tangent to the inner contour arc of the tire crown. The radius of the arc is calculated by the following formula: in, The radius of the inner contour arc of the tire shoulder. This refers to the design coefficient for the inner contour curve of the tire shoulder.

9. The design method for all-steel radial rail tires according to claim 4, characterized in that: In S4, the inner contour arc (203) of the tire sidewall is sequentially connected by a first inner arc, a second inner arc, and an inner straight line. The inner straight line is tangent to the second inner arc and the inner contour line of the tire bead. The radii of the first inner arc and the second inner arc are calculated using the following formula: in, The radius of the first inner arc. The radius of the second inner arc. , All of these are design coefficients for the inner contour arc of the tire sidewall.

10. The design method for all-steel radial rail tires according to claim 4, characterized in that: In S4, the inner contour line (204) of the bead is designed as an arc, and the radius of the inner contour line of the bead is calculated by the following formula: in, The radius of the inner contour line of the tire bead. This is the design coefficient for the inner contour line of the tire bead.

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