CN111361359A

CN111361359A - Tire and cover tire thereof

Info

Publication number: CN111361359A
Application number: CN202010372178.4A
Authority: CN
Inventors: 邹俊; 林桢棠; 许敦皓
Original assignee: Cheng Shin Tire and Rubber China Co Ltd
Current assignee: Cheng Shin Tire and Rubber China Co Ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-07-03

Abstract

The invention discloses a tire and a tire casing thereof, wherein the tire casing comprises a tire face part, the tire face part comprises a middle cambered surface section and tire shoulder cambered surface sections positioned on two axial sides of the middle cambered surface section, the tire face part is symmetrically arranged relative to an axial central plane of the tire casing, and the radial height of the tire face part gradually decreases from the axial center to the two axial sides; the radial height descending amount from the axial center of the middle cambered surface section to the axial edge of the middle cambered surface section is a first descending amount, the radial height descending amount from the axial center of the middle cambered surface section to the axial edge of the tread part is a second descending amount, and the ratio of the first descending amount to the second descending amount is 0.4-0.5. The outer tire of the tire provided by the invention can effectively improve abnormal eccentric wear at the tire shoulder of the outer tire.

Description

Tire and cover tire thereof

Technical Field

The invention relates to the technical field of tires, in particular to a tire and an outer tire thereof.

Background

If the tire tread is unreasonable in design, when the tire runs at a high speed, the outer contour of the tire tread and the ground grounding pattern are poor, abnormal abrasion at the tire shoulder of the tire tread can be caused, and the service life of the tire is further influenced.

Therefore, how to provide a solution to overcome the above-mentioned drawbacks remains a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a tire and a tire casing thereof, wherein the tire casing can effectively improve abnormal eccentric wear at tire shoulders of the tire casing.

In order to solve the technical problem, the invention provides a tire casing of a tire, which comprises a tread part, wherein the tread part comprises a middle cambered surface section and tire shoulder cambered surface sections positioned on two axial sides of the middle cambered surface section; the radial height descending amount from the axial center of the middle cambered surface section to the axial edge of the middle cambered surface section is a first descending amount, the radial height descending amount from the axial center of the middle cambered surface section to the axial edge of the tread part is a second descending amount, and the ratio of the first descending amount to the second descending amount is 0.4-0.5.

The ratio of the radial height descending amount from the axial center of the middle cambered surface section to the axial edge of the middle cambered surface section to the radial height descending amount from the axial center of the middle cambered surface section to the axial edge of the tread part can be controlled to be 0.4-0.5, and abnormal eccentric wear at the tire shoulder of the outer tire can be effectively improved.

Optionally, a ratio of the second drop amount to an axial dimension of the tread portion is between 0.03 and 0.04.

Optionally, the ratio of the radius corresponding to the shoulder camber segment to the radius corresponding to the middle camber segment is between 2 and 3.

Optionally, a ratio of an axial dimension of the mid-cambered section to an axial dimension of the tread portion is between 0.55-0.6.

Optionally, the ratio of the axial dimension of the tread portion to the axial maximum dimension of the casing is between 0.7 and 0.8.

Optionally, the tire further includes a bead portion, a radial distance between an axial center of the middle arc-shaped section and the bead portion is a first distance, a radial distance between an axial center of the middle arc-shaped section and an axial maximum dimension of the outer tire is a second distance, a radial distance between the axial maximum dimension of the outer tire and the bead portion is a third distance, and ratios of the second distance, the third distance and the first distance are all between 0.45 and 0.55.

The invention also provides a tire, which comprises an outer tire, and the outer tire of the tire is described above.

Since the outer tire of the tire has the technical effects as described above, the tire having the outer tire also has similar technical effects, and therefore, the detailed description thereof is omitted here.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the tire casing of the tire of the present invention;

FIG. 2 is a comparison of the casing ground contact characteristics of tires under different conditions.

The reference numerals in fig. 1 are explained as follows:

1 tread part, 11 middle arc surface sections, 12 tire shoulder arc surface sections, 2 tire lip parts and 3 tire side parts.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

The terms "first," "second," and the like, as used herein, are used for convenience in describing two or more structures or components that are identical or similar in structure and/or function, and do not denote any particular order or importance.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an outer tire of a tire according to an embodiment of the present invention.

As shown in fig. 1, the present invention provides a tire casing of a tire, comprising a tread portion 1, a bead portion 2 and a sidewall portion 3, wherein: the tread portion 1 refers to the position of the radial outer end face of the tyre casing, and at least partial area of the tread portion 1 is in contact with the ground in the use process; the tire lip 2 refers to the embedding position of the tire and the rim; the sidewall 3 is an axial end surface of the tire casing.

The tread portion 1 comprises a middle cambered surface section 11 and tire shoulder cambered surface sections 12 positioned on two axial sides of the middle cambered surface section 11, the tread portion 1 is symmetrically arranged relative to an axial central plane (a plane passing through an axial center and vertical to a central axis of the outer tire) of the outer tire, and the radial height of the tread portion 1 (the distance between each point on the tread portion 1 and the axial central line of the outer tire) gradually decreases from the axial center to the two axial sides; the radial height from the axial center of the middle arc surface section 11 to the axial edge of the middle arc surface section 11 can be called as a first drop amount, the radial height from the axial center of the middle arc surface section 11 to the axial edge of the tread part 1 can be called as a second drop amount, and the ratio of the first drop amount to the second drop amount is 0.4-0.5.

For ease of understanding, fig. 1 shows a radial cross-sectional structure of the tire casing with reference to fig. 1, where a radial distance P1 between the highest point of the middle arc segment 11 (i.e., the axial center point of the middle arc segment 11, point a in the drawing) and the lowest point of the middle arc segment 11 (i.e., the axial edge point of the middle arc segment 11, point B in the drawing) is the first drop amount, and a radial distance P2 between the point a and the lowest point of the shoulder arc segment 12 (i.e., the axial edge point of the end of the shoulder arc segment 12 away from the middle arc segment 11, point C in the drawing) is the second drop amount.

The tire will expand outward at point C during inflation, if the ratio of P1 to P2 is too small, i.e. point C falls less significantly than point B, it is easy to cause premature wear of the tread portion 2 near point C, and if the ratio of P1 to P2 is too large, i.e. point C falls more than point B, it is easy to cause uneven wear of the middle arc segment 11 and the shoulder arc segment 12, therefore, in the embodiment of the present invention, the ratio of P1 to P2 can be controlled between 0.4-0.5, so that abnormal uneven wear at the tire shoulder can be greatly improved.

Further, the ratio of the second drop amount P2 to the axial dimension of the tread portion 1 may be defined, and specifically, the above ratio may be set to be between 0.03 and 0.04 to improve the ground contact shape at the tire shoulder and the abnormal uneven wear at the tire shoulder. Referring to fig. 1, where half of the axial dimension of the tread portion 1 is denoted as TW in fig. 1, the ratio of P2 to TW may be between 0.06 and 0.08.

The ratio of the radius R2 corresponding to the shoulder arc segment 12 to the radius R1 corresponding to the middle arc segment 11 also has an influence on the ground-contacting shape of the tire casing, if the ratio of R2 to R1 is too small, the tread portion 1 will be recessed when being grounded, if the recessed portion is serious, the rapid wear of the tire casing near point C will be caused, and if the ratio of R2 to R1 is too large, the tread portion 1 will be raised when being grounded, which also causes uneven wear of the tread portion 1. Therefore, in the embodiment of the present invention, the ratio of R2 to R1 can be controlled between 2-3 to improve the concave condition of the ground-contacting shape of the tread portion 1, so that the ground-contacting shape is kept as flat as possible, and the actual ground-contacting area of the tire casing can be increased to achieve the purposes of uniform wear and prolonged service life.

The ratio of the axial dimension of the middle cambered surface section 11 to the axial dimension of the tread part 1 can be between 0.55 and 0.6, namely, the proportion of the middle cambered surface section 11 is ensured to be in a certain range, so that the grounding length of the central area of the tyre casing can be improved. Referring to fig. 1, where half of the axial dimension of the mid-arc segment 11 is labeled NW in fig. 1, the ratio of NW to TW may be between 0.55 and 0.6.

It can be understood that the two axial end faces of the tyre casing are generally convex, i.e. the sidewall 3 of the tyre casing can respectively protrude towards the two axial sides, so that the tyre casing has the maximum axial dimension, and with reference to the attached drawings, half of this maximum axial dimension can be denoted SW.

If the ratio of TW to SW is too small, that is, the axial dimension at the maximum position of the axial dimension of the tire casing is too large different from the axial dimension of the tread portion 1, under the condition that the tread portion 1 is stressed, pressure is easily concentrated at the center of the tread portion 1, so that the tread portion 1 is damaged, and if the ratio of TW to SW is too large, pressure is easily concentrated at the position of the tire shoulder, and abnormal eccentric wear at the tire shoulder is easily caused during long-term use. Therefore, in the embodiment of the present invention, it is also possible to set the ratio of the axial dimension of the tread portion 1 to the axial maximum dimension of the tire casing, that is, the ratio of TW to SW, specifically, the ratio may be set between 0.7 and 0.8, to effectively improve the uniformity of the tire ground contact property.

According to the arrangement position of the tire casing at the maximum axial size, the radial distance between the axial center (point A) of the middle cambered surface segment 11 and the tire lip 2 is called a first distance SH, the radial distance between the axial center (point A) of the middle cambered surface segment 11 and the maximum axial size of the tire casing is called a second distance SH1, and the radial distance between the maximum axial size of the tire casing and the tire lip 2 is called a third distance SH 2. In the process of twisting the tire casing, a large twisting force is easily generated between the tire side part 3 and the tread part 1, if the ratio of SH2 to SH is too large, the tread part 1 is easily damaged, and if the ratio of SH2 to SH is too small, the twisting force is concentrated on the tire lip part 2, so that the problems of cracking of the tire lip part 2, air leakage of the tire, tire burst and the like are caused. Therefore, in the embodiment of the invention, the ratio of the second spacing SH1, the third spacing SH2 and the first spacing SH can be controlled to be between 0.45 and 0.55, so that the grounding pressure of the tire casing can be effectively improved, and the damage of the twisting process to the tread part 1 and the tire lip part 2 can be reduced.

Referring to fig. 2, fig. 2 shows a comparison of the grounding characteristics of the tire casing of the tire under different conditions, including the estimated simulation of the grounding shape, the grounding length, the grounding pressure, the grounding area, etc., and the validity of the above definition on P1/P2, P2/TW, R2/R1, NW/TW, TW/SW, SH1/SH, SH2/SH can also be demonstrated through comparison of six embodiments.

The present invention also provides a tire, which may include a hub, an outer tube, an inner tube, and the like, wherein the outer tube may be the outer tube of the tire according to the above embodiments.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. The tyre casing of the tyre comprises a tyre surface part (1), and is characterized in that the tyre surface part (1) comprises a middle cambered surface section (11) and tyre shoulder cambered surface sections (12) positioned at two axial sides of the middle cambered surface section (11), the tyre surface part (1) is symmetrically arranged relative to an axial central plane of the tyre casing, and the radial height of the tyre surface part (1) gradually decreases from the axial center to the axial two sides;

the radial height descending amount from the axial center of the middle arc surface section (11) to the axial edge of the middle arc surface section (11) is a first descending amount, the radial height descending amount from the axial center of the middle arc surface section (11) to the axial edge of the tread part (1) is a second descending amount, and the ratio of the first descending amount to the second descending amount is 0.4-0.5.

2. A casing according to claim 1, characterised in that the ratio of said second drop to the axial dimension of said tread portion (1) is comprised between 0.03 and 0.04.

3. A tyre casing as claimed in claim 1, characterized in that the ratio of the radius corresponding to the shoulder arc (12) to the radius corresponding to the central arc (11) is between 2 and 3.

4. A tyre casing according to claim 1, wherein the ratio of the axial dimension of the mid-camber section (11) to the axial dimension of the tread portion (1) is between 0.55 and 0.6.

5. A casing of a tyre according to any one of claims 1 to 4, wherein the ratio of the axial dimension of the tread portion (1) to the axial maximum dimension of the casing is between 0.7 and 0.8.

6. A tyre casing according to any one of claims 1 to 4, further comprising a bead portion (2), the axial centre of the mid-arc segment (11) being radially spaced from the bead portion (2) by a first distance, the axial centre of the mid-arc segment (11) being radially spaced from the axially largest dimension of the casing by a second distance, the axially largest dimension of the casing being radially spaced from the bead portion (2) by a third distance, the ratio of the second distance, the third distance and the first distance being between 0.45 and 0.55.

7. A tyre comprising a casing, wherein the casing is a casing of a tyre according to any one of claims 1 to 6.