CN113392469B - Design method for thickness of car tire airtight layer - Google Patents
Design method for thickness of car tire airtight layer Download PDFInfo
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- CN113392469B CN113392469B CN202110693778.5A CN202110693778A CN113392469B CN 113392469 B CN113392469 B CN 113392469B CN 202110693778 A CN202110693778 A CN 202110693778A CN 113392469 B CN113392469 B CN 113392469B
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- G06F30/15—Vehicle, aircraft or watercraft design
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Abstract
The invention discloses a method for designing the thickness of an airtight layer of a car tire, which comprises the following specific steps of determining the thickness Ga of the airtight layer of a finished tire; establishing a coordinate system by taking the geometric center of the finished tire as an origin, and obtaining a coordinate conversion relation between the thickness of the airtight layer and the thickness ga of the airtight layer of the semi-finished tire measuring point; and obtaining the thickness Ga of the inner liner of the measuring point position of the semi-finished tire according to the thickness Ga of the inner liner and the coordinate conversion relation. The invention obtains the thickness of the corresponding semi-finished product by calculation through the conversion between the target value size of the inner liner of the finished product tire and the thickness size of the semi-finished product tire. Under the condition of meeting the thickness standard of the airtight layer on the section of the finished tire, the air tightness of the tire is improved, and the material cost of the airtight layer of the tire is reduced.
Description
Technical Field
The invention relates to the technical field of tires, in particular to a method for designing the thickness of an airtight layer of a car tire.
Background
The thickness of the tire airtight layer is one of the key parameters of tire design, and the parameter has a key effect on the air pressure of the tire, and is directly related to the important performances of the tire such as the bearing capacity, the service durability and the like in the use process. And the thickness dimension of the tire section airtight layer is determined by the dimension of the tire semi-finished product component and the dimension of the mold inner mold. Therefore, the accuracy of the size and shape design of the semi-finished components of the tire inner liner affects the manufacturing process and the manufacturing cost, the tire section inner liner and the material cost on the finished section, and the product development efficiency on the development.
The prior art has the defects that the method is only used for calculating the thickness of the airtight layer at the middle point of the crown part of the tire, the calculated thickness of the point is used as the basis for the thickness conversion between the semi-finished product and the finished product of the whole tire, the method is not suitable for calculating the thicknesses of other points except for the thinnest point, and the thicknesses of other points exceed the standard, thereby causing the waste of material cost. The conversion coefficient between the semi-finished product and the finished product of the inner liner is defined in the direction of the tire section height by adopting an empirical coefficient method, but the expansion amount between the semi-finished product and the finished product in the section width direction is not considered.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and adopts a design method of the thickness of the inner liner of the car tire to solve the problems in the background technology.
A method for designing the thickness of an airtight layer of a car tire specifically comprises the following steps:
determining the thickness Ga of the inner liner of the finished tire;
establishing a coordinate system by taking the geometric center of the finished tire as an origin, and obtaining a coordinate conversion relation between the thickness of the airtight layer and the thickness ga of the airtight layer of the semi-finished tire measuring point;
obtaining the thickness Ga of the inner liner of the measuring point position of the semi-finished tire according to the thickness Ga of the inner liner and the coordinate conversion relation:
in the formula, D is the Y-axis coordinate of the measuring point of the thickness of the airtight layer of the section of the finished tire, D is the Y-axis coordinate of the measuring point of the thickness of the airtight layer of the semi-finished product, H is the X-axis coordinate of the measuring point of the airtight layer of the section of the finished tire, and T is the axial coordinate of the measuring point of the airtight layer of the section of the finished tire j The height of the raised texture of the curing bladder in the uninflated state of the tire.
Adopt above-mentioned technical scheme: the thickness dimension of the inner liner of the semi-finished tire can be obtained by utilizing coordinate conversion and calculation on the thickness dimension of the inner liner of the finished tire in the established coordinate system.
As a further aspect of the invention: when the measuring point is the thin point of the air barrier, T j Is a negative value; when the measurement point is the thickness point of the airtight layer j Is a positive value; t when curing with a non-textured bladder j ＝0。
Adopt above-mentioned technical scheme: and adjusting different values of parameters in the calculation formula by using different positions of the selected measuring points, so as to obtain more detailed and accurate thickness dimension of the inner liner of the semi-finished tire according to actual conditions.
Compared with the prior art, the invention has the following technical effects:
by adopting the technical scheme, the target value of the thickness of the inner liner of the finished tire is determined, and meanwhile, a coordinate system is established by taking the geometric center of the finished tire as an original point, the coordinate relation between the measuring point of the inner liner of the finished tire and the measuring point of the thickness of the semi-finished inner liner is converted, and the conversion relation is established. Therefore, the thickness size and the shape of the airtight layer of the semi-finished tire are designed through the technical means, the product development efficiency is improved, and the development cost is reduced.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a schematic step diagram of a passenger car tire inner liner thickness design method according to some embodiments disclosed herein;
FIG. 2 is a schematic view of a coordinate system established for the geometric center of a finished tire according to some embodiments disclosed herein;
FIG. 3 is a schematic illustration of an inner liner measurement point thickness of a finished tire according to some embodiments disclosed herein;
FIG. 4 is a schematic diagram of 5 measurement points selected during a testing process according to some embodiments disclosed herein;
FIG. 5 is a schematic illustration of a semi-finished hermetic layer of uniform thickness according to some embodiments disclosed herein;
FIG. 6 is a schematic illustration of a semi-finished hermetic layer thickness of 0.77mm for a finished hermetic layer thickness for some embodiments disclosed herein.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The design aim of the invention is to calculate the thickness of the designed or selected semi-finished airtight layer component through drawing modeling and calculation formula conversion of the finished tire section size, and realize the thickness of the rubber material of the finished tire section airtight layer after molding and vulcanizing of the tire blank.
Referring to fig. 1 and 2, in an embodiment of the present invention, a method for designing a thickness of an inner liner of a car tire includes:
s1, determining the thickness Ga of the inner liner of the finished tire;
specifically, a target value Ga of the required thickness of the inner liner is determined by performing a drawing simulation on the cross-sectional dimension of the finished tire.
S2, establishing a coordinate system by taking the geometric center of the finished tire as an origin, and obtaining a coordinate conversion relation between the thickness of the airtight layer and the thickness ga of the airtight layer of the semi-finished tire measuring point;
as shown in fig. 2, a coordinate system is established with the geometric center of the finished tire as the origin, and in the figure, the tire section width direction is the horizontal axis direction and the section height direction is the vertical axis direction. J-DIA is the inner diameter of the mold, and D-DIA is the tire engagement diameter on the mold.
As shown in FIG. 3, according to the requirement of the airtightness property of the section of the finished tire, the target value Ga of the thickness of the airtightness layer of the section of the finished tire is determined, and a material distribution diagram is drawn.
S3, obtaining the thickness Ga of the inner liner at the measuring point of the semi-finished tire according to the thickness Ga of the inner liner and the coordinate conversion relation:
in the formula, D is the Y-axis coordinate of the measuring point of the thickness of the airtight layer of the section of the finished tire, D is the Y-axis coordinate of the measuring point of the thickness of the airtight layer of the semi-finished product, H is the X-axis coordinate of the measuring point of the airtight layer of the section of the finished tire, and T is the axial coordinate of the measuring point of the airtight layer of the section of the finished tire j The height of the raised texture of the curing bladder in the uninflated state of the tire.
In a specific embodiment, a thickness measurement point position of the air barrier component is set, and the thickness of the corresponding semi-finished product is calculated according to the formula.
When the measuring point is the thin point of the air barrier, T j Is a negative value; when the measurement point is the thickness point of the airtight layer j Is a positive value; when curing with a non-textured bladder, T j ＝0。
The following are the test procedures and test results of some embodiments disclosed in the present invention:
as shown in fig. 4, 5 points are respectively taken at the corresponding positions of the tire section and the semi-finished product for calculation and measurement. The thickness of the semi-finished airtight layer is uniform and ga is 1.2mm, as shown in fig. 5.
The thickness of the inner liner of the finished tire section is calculated by adopting a calculation formula, the thickness of the inner liner of the selected 5 point positions is calculated, the comparison consistency between the measurement result and the calculation result of the finished tire section is high, and the table shows that:
the thickness of the thinnest point of the finished product is set to be 0.77mm to meet the product performance requirement; and the thickness of the liner exceeds the required thickness at points other than the thinnest point. Considering the reduction of the saved finished product of the material, the design calculation formula is adopted, the thickness of each point of the semi-finished product is calculated by adopting the design formula on the assumption that the thickness of the designed target finished product airtight layer is 0.77mm, and the thickness of the semi-finished product ruler is designed, as shown in figure 6, the semi-finished product size of 5 point positions is selected.
The target values of the section airtight layer thickness and the calculation results are as follows:
setting a finished product target thickness which meets the requirement of tire airtightness to be 0.84mm, calculating the required thickness of a semi-finished product at each point, measuring according to a sample, designing the thickness of the semi-finished product according to a calculation formula to meet the requirement of the thickness dimension of the finished product, and having high consistency; on the basis of meeting the new airtight requirement, the material is saved; according to the calculation of the specification, the material of the airtight layer is saved by about 13 percent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents, which should be construed as being within the scope of the invention.
Claims (2)
1. A design method for the thickness of an airtight layer of a car tire is characterized by comprising the following specific steps:
determining the thickness Ga of the inner liner of the finished tire;
establishing a coordinate system by taking the geometric center of the finished tire as an origin, and obtaining a coordinate conversion relation between the thickness of the airtight layer and the thickness ga of the airtight layer of the semi-finished tire measuring point;
obtaining the thickness Ga of the inner liner of the measuring point position of the semi-finished tire according to the thickness Ga of the inner liner and the coordinate conversion relation:
in the formula, D is the Y-axis coordinate of the measuring point of the thickness of the airtight layer of the section of the finished tire, D is the Y-axis coordinate of the measuring point of the thickness of the airtight layer of the semi-finished product, H is the X-axis coordinate of the measuring point of the airtight layer of the section of the finished tire, and T is the axial coordinate of the measuring point of the airtight layer of the section of the finished tire j The height of the raised grain of the curing bladder in the uninflated state of the tire.
2. The method as claimed in claim 1, wherein T is the point of the inner liner at which the measurement point is located j Is a negative value; when the measurement point is the thickness point of the airtight layer j Is a positive value; when curing with a non-textured bladder, T j ＝0。
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| CN202110693778.5A CN113392469B (en) | 2021-06-22 | 2021-06-22 | Design method for thickness of car tire airtight layer |
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Citations (4)
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|---|---|---|---|---|
| CN102922759A (en) * | 2012-11-09 | 2013-02-13 | 双钱集团股份有限公司 | Method for confirming machining size of semi-finished product of inside liner according to thickness of inside liner required by tire |
| JP2018008616A (en) * | 2016-07-14 | 2018-01-18 | 横浜ゴム株式会社 | Pneumatic tire |
| CN108973536A (en) * | 2018-06-30 | 2018-12-11 | 安徽佳通乘用子午线轮胎有限公司 | A kind of most thin finished product of passenger vehicle tyre inner liner corresponds to the design method of blank thickness |
| CN112307631A (en) * | 2020-11-03 | 2021-02-02 | 安徽佳通乘用子午线轮胎有限公司 | Design method for determining thickness dimension of finished tire section product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10994578B2 (en) * | 2015-09-14 | 2021-05-04 | Jiangsu University | Method for improving production process for wide-base truck radial tire |
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|---|---|---|---|---|
| CN102922759A (en) * | 2012-11-09 | 2013-02-13 | 双钱集团股份有限公司 | Method for confirming machining size of semi-finished product of inside liner according to thickness of inside liner required by tire |
| JP2018008616A (en) * | 2016-07-14 | 2018-01-18 | 横浜ゴム株式会社 | Pneumatic tire |
| CN108973536A (en) * | 2018-06-30 | 2018-12-11 | 安徽佳通乘用子午线轮胎有限公司 | A kind of most thin finished product of passenger vehicle tyre inner liner corresponds to the design method of blank thickness |
| CN112307631A (en) * | 2020-11-03 | 2021-02-02 | 安徽佳通乘用子午线轮胎有限公司 | Design method for determining thickness dimension of finished tire section product |
Non-Patent Citations (3)
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| Tire Slip Angle Estimation B ased on the Intelligent Tire Technology;Nan Xu等;《IEEE Transactions on Vehicular Technology》;20210216;第70卷(第3期);第2239-2249页 * |
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