Tire groove design method and tire groove structure

Abstract

The present application relates to the technical field of automobile tires, and particularly relates to a tire groove design method and a tire groove structure, which adopts a coefficient lambda for judgment, lambda is a ratio of an arc line horizontal length alpha of a tire half-section groove near a tire crown center one side and a pattern block arc line horizontal length beta, introduces lambda to take the arc length parameter of the groove as a design standard of the arc length in the groove structure, and provides a parameter reference, solves the technical problem that the groove design in the prior art has no design method for the arc length, mainly relies on the experience of engineers for judgment in actual design operation, and it is difficult to predict the damage position of the groove, so that a better design effect is achieved, the design method of the groove structure is optimized, the most easily damaged position of the tread groove is predicted, a reference is provided for tire durability design, and groove bottom cracks are effectively prevented during design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile tires, in particular to a tire groove design method and a tire groove structure. BACKGROUND

[0002] Tire tread strain refers to the local relative deformation of the tread when the tire is subjected to external forces (uneven road surface, load change, etc.). Tread strain is one of the important factors affecting tire footprint. Different tread strain patterns can result in different footprint shapes and ground pressure distributions.

[0003] For example, in the shoulder area, the maximum longitudinal tensile strain often occurs at the edge of the transverse groove, which can cause the footprint to appear obvious concave-convex or uneven. When the tread experiences a large longitudinal tensile strain, the footprint can become longer or shorter in the longitudinal direction, thereby changing the footprint area. When the tread strain is uneven, the pressure distribution within the footprint can also be uneven, which can cause uneven tire wear or affect driving stability. Among them, the structure position of the tire groove has a very important influence on the shape of the tire footprint and the ground pressure distribution. The existing tire groove design parameters mainly fine-tune the shape of the groove, thereby setting the groove wall angle.

[0004] However, the current groove design does not have a design method for its arc length, and in actual design operations, it mainly relies on the experience of engineers to judge, making it difficult to predict the damage position of the groove and achieve better design results. SUMMARY

[0005] The purpose of the present application is to provide a tire groove design method and a tire groove structure to solve the technical problem that the current groove design does not have a design method for its arc length, and in actual design operations, it mainly relies on the experience of engineers to judge, making it difficult to predict the damage position of the groove and achieve better design results.

[0006] In a first aspect, the present application provides a tire groove design method and a tire groove structure, wherein the tire groove design method uses a coefficient λ to describe the position of the tire groove.

[0007] The coefficient λ is the ratio of the horizontal length of the arc near the crown center side of the groove to the horizontal length of the block arc;

[0008] The groove design method comprises the following steps:

[0009] Step 1: For the tire model to be set, obtain the material distribution data of any tire structure, and set multiple sets of coefficient λ values.

[0010] Step two, a data model of the tire structure is constructed for a plurality of sets of the coefficient λ, finite element analysis is performed, and static stress strain data of the tire structure is obtained;

[0011] Step three, a tire strain curve is drawn according to the static stress strain data, a tire strain extreme value position is judged, and the coefficient λ is optimized.

[0012] Further, after the static stress strain data of the tire structure is obtained, a pattern groove damage position is predicted according to the tire strain extreme value position.

[0013] Further, the coefficient λ is optimized, the tread strain extreme value size is judged according to the value range of the coefficient λ after optimization, and the pattern groove design result is judged.

[0014] The application also provides a tire pattern groove structure designed by the tire pattern groove design method.

[0015] Further, the pattern groove is provided with 3-5.

[0016] Further, the pattern groove is provided with three, and the coefficients of the three pattern grooves are respectively 0.52, 0.58 and 0.76.

[0017] Compared with the prior art, the tire pattern groove design method provided by the application adopts the coefficient λ for judgment, λ is the ratio of the horizontal length α of the arc line on the side close to the tire crown center of the pattern groove to the horizontal length β of the arc line of the pattern block, the arc length parameter of the pattern groove is introduced as the design standard of the arc length in the pattern groove structure by introducing λ, and a parameter reference is provided, the technical problem that the pattern groove design in the prior art has no design method for the arc length of the pattern groove and is difficult to predict the pattern groove damage position mainly relying on the experience of engineers in actual design operation is solved, the design method of the pattern groove structure is optimized, the position of the pattern groove of the tire tread that is most prone to damage is predicted, a reference is provided for the design of the durability of the tire, and the groove bottom crack is effectively prevented during design. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 The overall structure of the tire provided by the embodiment of the application is shown in the sectional view.

[0020] Reference signs:

[0021] 100, tire; 200, groove. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0029] As Figure 1 shown, the present application provides a tire groove design method and a tire groove structure. The tire groove design method uses a coefficient λ to describe the position of the tire groove. The coefficient λ is the ratio of the horizontal length of the arc line near the crown center of the tire half-section groove to the horizontal length of the block arc line. The groove design method includes the following steps:

[0030] Step 1, for the tire model to be set, obtain the material distribution data of any tire structure, set multiple sets of coefficient λ values;

[0031] Step 2, construct a data model for the tire structure of multiple sets of coefficients λ, perform finite element analysis, and obtain the static stress and strain data of the tire structure;

[0032] Step 3, draw a tire strain curve according to the static stress and strain data, judge the position of the tire strain extreme value, and optimize the coefficient λ.

[0033] That is, the present application provides a tire groove design method, which introduces λ as a design standard for the arc length parameter of the groove, and provides a parameter reference. The technical problem of the prior art that the groove design has no design method for the arc length, and the position of the groove damage is difficult to predict in actual design operation mainly relying on the experience of engineers, so as to realize better design effect, optimize the design method of the groove structure, predict the position of the most easily damaged groove of the tire tread, and provide a reference for the design of the durability of the tire. Effectively prevent groove bottom cracking during design.

[0034] Specifically, α is the horizontal length of the arc line near the crown center of the tire half-section groove, β is the horizontal length of the block arc line, and the formula of λ is as follows:

[0035]

[0036] Different specifications of tire contour design (running surface width, cross-sectional width, tire outer diameter, rim size; tire height is determined according to the outer diameter and the rim height) have national standard ranges, and the upper and lower tire side heights need to be designed according to the tire model and actual production requirements. Therefore, after confirming the tire model to be designed, the material distribution diagram of any tire structure is obtained, thereby obtaining the tire structure without a pattern groove and each type of pattern groove structure, and the position of the pattern groove can be set according to the coefficient λ. Thus, the tire structure model corresponding to different coefficients λ can be obtained by means of three-dimensional modeling, and then the model is subjected to finite element analysis to obtain the static stress strain data of the tire structure, thereby obtaining the strain extreme value distribution of the tire structure model and the strain extreme value data, and drawing the tire strain curve graph of the coefficient λ-strain extreme value. The optimal coefficient λ is obtained by regression analysis and other mathematical methods. When multiple pattern grooves need to be set on the tire, the optimal value range of the coefficient λ can be obtained according to the strain data, and the optimal value range of the coefficient λ is ensured to be within the range, so that the reasonable design of the pattern groove can be realized.

[0037] Further, after obtaining the static stress strain data of the tire structure, the pattern groove damage position is predicted according to the tire strain extreme value position.

[0038] Specifically, the static stress strain data of the tire structure can be obtained by subjecting the model to finite element analysis, thereby obtaining the strain extreme value distribution of the tire structure model, and the strain extreme value position of the tire pattern groove can be obtained, that is, the position of the pattern groove most prone to damage. In this embodiment, the strain extreme value position of the tire pattern groove is at the bottom of the pattern groove, and according to the above prediction result, the designer can pretreat the strain extreme value position of the pattern groove by local reinforcement, thereby preventing possible damage such as groove bottom cracking.

[0039] Further, the coefficient λ is optimized, and the tread strain extreme value is judged according to the value range of the optimized coefficient λ, and the pattern groove design result is judged.

[0040] Specifically, the value range of the optimized coefficient λ is set to 0.2-0.8; when λ>0.8, the tread strain extreme value is large, the tire wear is uneven, and the risk of groove bottom cracking is high; when 0.2≤λ≤0.8, the tread strain extreme value is small, the tire wear is uneven, and the risk of groove bottom cracking is low; when λ<0.2, the tread strain extreme value is large, the tire wear is uneven, and the risk of groove bottom cracking is high.

[0041] The application also provides a tire pattern groove structure designed by the tire pattern groove design method, and the plurality of pattern grooves are sequentially arranged in the tire cross-section, and the coefficient λ of all the pattern grooves is greater than or equal to 0.2 and less than or equal to 0.8.

[0042] Specifically, by setting the value range of the coefficient λ of the arc length of the tire groove to 0.2-0.8, the stress concentration at the bottom of the tire groove can be reduced, the distribution of the tread strain is more uniform, the tire footprint shape and the ground pressure distribution are improved, and the problem of the tire groove bottom crack is solved.

[0043] Further, the groove is provided with 3-5.

[0044] Specifically, the number of the groove mainly depends on the design requirements and the use environment of the tire. In the use scenarios where greater grip, larger ground contact area, high-speed driving and emergency braking are required, the number of the groove should be relatively reduced. In the use scenarios where better drainage and reduced risk of skidding are required, the number of the groove should be relatively increased. In the embodiment, the number of the groove is set to 3-5.

[0045] Further, the groove is provided with three, and the coefficients of the three grooves are set to 0.52, 0.58 and 0.76 respectively.

[0046] Specifically, the strain curve of the tire can be obtained by finite element analysis, and when the value range of the coefficient λ is set to 0.2-0.5, the position of the extreme value of the tread strain deviates from the tire crown center, and when the value range of the coefficient λ is greater than 0.8, the position of the extreme value of the tread strain deviates towards the tire crown center. In order to further ensure the uniform distribution of the tread strain and reduce the stress concentration at the bottom of the tire groove, the value range of the coefficient λ is preferably 0.5-0.8. In the embodiment, the λ of the tire groove structure is set to 0.58, the α is set to 75.95 mm, and the β is set to 132.5 mm. At this time, the extreme value point of the strain deviates from the center of the tread by 97 mm, and the strain curve of the tire obtained by finite element analysis is a wavy line without obvious extreme value, and the risk of groove bottom crack damage is extremely low.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for designing tire tread grooves, characterized in that, The tire tread groove design method uses a coefficient λ to describe the position of the tire tread grooves. The coefficient λ is the ratio of the horizontal length of the arc from the upper edge of a certain tread groove on the tire half-section to the center of the tread to the horizontal length of the arc of the tread block area. The pattern groove design method includes the following steps: Step 1: For the tire model to be set, obtain the material distribution data of any tire structure and set multiple sets of the coefficient λ values; Step 2: Construct a data model of the tire structure for multiple sets of coefficients λ, perform finite element analysis, and obtain the static stress and strain data of the tire structure; Step 3: Plot the tire strain curve based on the static stress-strain data, determine the extreme value location of the tire strain, and optimize the coefficient λ.

2. The tire tread groove design method according to claim 1, characterized in that, After obtaining the static stress-strain data of the tire structure, the location of tread groove damage is predicted based on the extreme strain value location of the tire.

3. The tire tread groove design method according to claim 2, characterized in that, Optimize the coefficient λ, and determine the extreme value of tread strain based on the optimized value range of the coefficient λ, and determine the design result of the tread groove.

4. A tire tread groove structure, designed using the tire tread groove design method as described in any one of claims 1-3, characterized in that, Several of the tread grooves are sequentially arranged on the tire cross-section, and the coefficient λ of all the tread grooves is greater than or equal to 0.2 and less than or equal to 0.

8.

5. The tire tread groove structure according to claim 4, characterized in that, The patterned grooves are provided in 3-5 parts.

6. The tire tread groove structure according to claim 5, characterized in that, The pattern groove is provided in three parts, and the coefficients of the three pattern grooves are set to 0.52, 0.58 and 0.76 respectively.

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