CN111382478A - Design method of tire with controllable ground pressure distribution - Google Patents

Abstract

The invention relates to the technical field of tire structure design, in particular to a design method of a tire with controllable ground pressure distribution. A design method of a tire with controllable ground contact pressure distribution comprises a 1# belt ply, a 2# belt ply, a 3# belt ply and a 0-degree belt ply which are arranged on a carcass ply; the method is characterized in that after the overall layout design of the tire is finished, the width, the angle and the expansion rate of a 1# belt ply, a 2# belt ply and a 3# belt ply are adjusted in the construction design to control the grounding pressure distribution shape of the final finished tire. The required grounding pressure distribution shape can be designed only by using a normal construction method. If the distribution shape of the grounding pressure needs to be changed, the influence factor of the design of the belted layer in construction can be adjusted, and the method is simple and controllable.

Description

Design method of tire with controllable ground pressure distribution

Technical Field

The invention relates to the technical field of tire structure design, in particular to a design method of a tire with controllable ground pressure distribution.

Background

The tire is the only ground contact part of car, and the matching of tire, road surface and car chassis forms the car various performance, and tire performance is crucial to car research analysis. The influence factors of the tire performance are more, wherein the ground contact pressure distribution of the tire is particularly critical, and the ground contact pressure distribution plays an important role in the structural design of the tire. The distribution of the ground contact pressure of the tire can directly influence the wear resistance, the rolling resistance, the steering stability, the noise and the like of the tire, and is the basis for researching various performances of the tire. However, the distribution of the tire contact pressure is influenced by a plurality of factors, and the inner and outer contours, the belt layer, the tire body, the shape of the semi-finished product, the pattern and the like in the tire structure have great influence on the distribution, so that the tire with controllable contact pressure distribution needs to be manufactured very difficultly.

Chinese patent (CN101187955B) discloses a tire section design method using belt bending, which can reflect not only the ground contact shape and the distribution of ground contact pressure of the entire tire, but also the ground contact shape and the distribution of ground contact pressure of each tread block in advance. Although the method reported in this patent can design the expected tire ground contact pressure distribution, the design is the whole cross section, and the influence factors include the outer contour, the belt layer, the carcass, the semi-finished product, the pattern, etc., if the ground contact pressure distribution shape needs to be changed, the mold, the semi-finished product shape, the pattern, the belt layer bending shape, etc. need to be redesigned, wherein the control factor is the belt layer bending shape. In the case of all-steel radial tires, the tire belts are required to be as flat as possible, the curved belts cause the tire to deteriorate, and how the belts are curved is an uncontrollable factor in the normal manufacturing construction of the tire.

Disclosure of Invention

In view of the problems in the background art, the invention provides a design method of a tire with controllable ground contact pressure distribution, which can design a required ground contact pressure distribution shape only by using a normal construction method. If the distribution shape of the grounding pressure needs to be changed, the influence factor of the design of the belted layer in construction can be adjusted, and the method is simple and controllable.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a design method of a tire with controllable ground contact pressure distribution comprises a 1# belt ply, a 2# belt ply, a 3# belt ply and a 0-degree belt ply which are arranged on a carcass ply; the method is characterized in that after the overall layout design of the tire is finished, the width, the angle and the expansion rate of a 1# belt ply, a 2# belt ply and a 3# belt ply are adjusted in the construction design to control the grounding pressure distribution shape of the final finished tire.

Preferably, the distribution shape of the grounding pressure is judged by using a rectangle degree index L;

w1 is the width of a No. 1 belt layer, A1 is the included angle between the No. 1 belt layer and a tire body, E1 is the expansion rate of the No. 1 belt layer, and the vertical distance between the end point and the center of the No. 1 belt layer is not more than 2 mm;

w2 is the width of a No. 2 belt layer, A2 is the included angle between the No. 2 belt layer and a tire body, E2 is the expansion rate of the No. 2 belt layer, and the vertical distance between the end point and the center of the No. 2 belt layer is not more than 3 mm;

w3 is the width of a No. 3 belt layer, A3 is the included angle between the No. 3 belt layer and a tire body, and E3 is the expansion rate of the No. 3 belt layer;

b is the running surface width of the tire where the belt structure is located;

when L is 0, the construction adjustment of the belted layer has no influence on the distribution shape of the tire grounding pressure; when L is larger than or equal to 0, the distribution shape of the tire grounding pressure can be changed to be square by the belt layer construction adjustment, and the effect is more obvious when the numerical value is larger; when L is less than or equal to 0, the tire grounding pressure distribution shape is rounded by the belt layer construction adjustment, and the effect is more obvious when the numerical value is larger.

The invention also provides a tire with controllable ground contact pressure distribution, which is designed by adopting the method.

The invention has the beneficial effects that:

by changing the belt width, angle and expansion ratio, the tendency of the ground contact pressure distribution shape of the tire to change can be predicted, and a tire satisfying a desired ground contact pressure distribution shape can be obtained. The design method can enlarge the influence of the belted layer on the tire grounding pressure distribution shape by adjusting the expansion rate of the belted layer and generate decisive influence on the belted layer, thereby realizing the controllable design of the tire grounding pressure distribution by only changing the construction of the belted layer on the premise of not changing other influencing factors.

Drawings

FIG. 1 is a schematic view of the belt structure of the tire of the present invention.

Fig. 2 shows the original ground pressure distribution.

FIGS. 3-7 show the results of ground contact pressure distributions for tires constructed according to the belt design methods of examples 1-5, respectively.

Detailed Description

The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto, and the effect of the invention will be illustrated by taking an all-steel radial tire with 12R22.5 specification as an example.

The tire belt layer shown in fig. 1 adopts a 0-degree belt layer structure, the structure comprises a 1# belt layer 1, a 2# belt layer 1, a 3# belt layer 3 and a 0-degree belt layer 4 on a carcass ply, the 1# belt layer 1 is laid above the carcass ply, the 2# belt layer 2 and the 3# belt layer 3 are sequentially laid above the 1# belt layer 1, the 0-degree belt layers 4 are respectively laid above two ends of the 2# belt layer 2 and on two sides of the 3# belt layer 3, and the 0-degree belt layer 4 is of an upper and lower layer structure.

The invention relates to a design method of a tire with controllable ground contact pressure distribution, which is characterized in that after the overall layout design of the tire is completed, the width, the angle and the expansion rate of a 1# belt ply, a 2# belt ply and a 3# belt ply are adjusted in the construction design to control the ground contact pressure distribution shape of a final finished tire.

The distribution shape of the grounding pressure is judged by adopting a rectangle degree index L;

w1 is the width of a No. 1 belt layer, A1 is the included angle between the No. 1 belt layer and a tire body, E1 is the expansion rate of the No. 1 belt layer, and the vertical distance between the end point and the center of the No. 1 belt layer is not more than 2 mm;

w2 is the width of a No. 2 belt layer, A2 is the included angle between the No. 2 belt layer and a tire body, E2 is the expansion rate of the No. 2 belt layer, and the vertical distance between the end point and the center of the No. 2 belt layer is not more than 3 mm;

w3 is the width of a No. 3 belt layer, A3 is the included angle between the No. 3 belt layer and a tire body, and E3 is the expansion rate of the No. 3 belt layer;

b is the running surface width of the tire where the belt structure is located;

when L is 0, the construction adjustment of the belted layer has no influence on the distribution shape of the tire grounding pressure; when L is larger than or equal to 0, the distribution shape of the tire grounding pressure can be changed to be square by the belt layer construction adjustment, and the effect is more obvious when the numerical value is larger; when L is less than or equal to 0, the tire grounding pressure distribution shape is rounded by the belt layer construction adjustment, and the effect is more obvious when the numerical value is larger.

Example 1

By the technical method, a belted layer is redesigned, the rectangle index L of the tire ground pressure distribution shape is firstly designed to be 0, and the specific parameters are as follows (the width unit is mm):

W1

W2

W3

W0

b

A1

A2

E1

E2

E0

L

180

220

120

40

240

66°

75°

1.8％

1.7％

2％

0

example 2

By the technical method, a belted layer is redesigned, the rectangle index L of the tire ground pressure distribution shape is designed to be 1%, and the specific parameters are as follows (the width unit is mm):

W1

W2

W3

W0

b

A1

A2

E1

E2

E0

L

180

220

120

40

240

66°

75°

2％

2％

1.4％

1％

example 3

By the technical method, a belted layer is redesigned, the rectangle index L of the tire ground pressure distribution shape is designed to be 2%, and the specific parameters are as follows (the width unit is mm):

W1

W2

W3

W0

b

A1

A2

E1

E2

E0

L

180

220

120

40

240

66°

75°

2.5％

2.5％

1.1％

2％

example 4

By the technical method, a belted layer is redesigned, the rectangle index L of the tire ground pressure distribution shape is firstly designed to be-1%, and the specific parameters are as follows (the width unit is mm):

W1

W2

W3

W0

b

A1

A2

E1

E2

E0

L

180

220

120

40

240

66°

75°

1.4％

1.6％

2.6％

-1％

example 5

By the technical method, a belted layer is redesigned, the rectangle index L of the tire ground pressure distribution shape is designed to be-2%, and the specific parameters are as follows (the width unit is mm):

W1

W2

W3

W0

b

A1

A2

E1

E2

E0

L

180

220

120

40

240

66°

75°

0.9％

0.9％

2.7％

-2％

tires were designed according to the belt design methods of examples 1 to 5 (all other factors were kept the same), and trial-manufacture was carried out, and the ground contact pressure distribution results of the manufactured tires are shown in fig. 2. As can be seen from the figure, by using the belt layer design method of the invention, the tire grounding pressure distribution shape can be adjusted by adjusting the tire grounding pressure distribution shape rectangularity index L, and the tire design with controllable grounding pressure distribution is realized.

Claims (3)

1. A design method of a tire with controllable ground contact pressure distribution comprises a 1# belt ply, a 2# belt ply, a 3# belt ply and a 0-degree belt ply which are arranged on a carcass ply; the method is characterized in that after the overall layout design of the tire is finished, the width, the angle and the expansion rate of a 1# belt ply, a 2# belt ply and a 3# belt ply are adjusted in the construction design to control the grounding pressure distribution shape of the final finished tire.

2. The design method of a tire with controllable ground contact pressure distribution according to claim 1, wherein the shape of ground contact pressure distribution is judged by using a squareness index L;

w1 is the width of a No. 1 belt layer, A1 is the included angle between the No. 1 belt layer and a tire body, E1 is the expansion rate of the No. 1 belt layer, and the vertical distance between the end point and the center of the No. 1 belt layer is not more than 2 mm;

w2 is the width of a No. 2 belt layer, A2 is the included angle between the No. 2 belt layer and a tire body, E2 is the expansion rate of the No. 2 belt layer, and the vertical distance between the end point and the center of the No. 2 belt layer is not more than 3 mm;

w3 is the width of a No. 3 belt layer, A3 is the included angle between the No. 3 belt layer and a tire body, and E3 is the expansion rate of the No. 3 belt layer;

b is the running surface width of the tire where the belt structure is located;

when L is 0, the construction adjustment of the belted layer has no influence on the distribution shape of the tire grounding pressure; when L is larger than or equal to 0, the distribution shape of the tire grounding pressure can be changed to be square by the belt layer construction adjustment, and the effect is more obvious when the numerical value is larger; when L is less than or equal to 0, the tire grounding pressure distribution shape is rounded by the belt layer construction adjustment, and the effect is more obvious when the numerical value is larger.

3. A tire having a controlled ground contact pressure distribution, the tire being designed by the method of claim 1 or 2.

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