TWI819665B - Pneumatic tire - Google Patents

Abstract

A pneumatic tire includes a carcass cord, an apex strip, a bead chafer, and an edge wrapping strip. The tire cord is wound from an inner side of the apex strip to an outer side of the apex strip and forms a carcass-cord upper end point. The bead chafer is wound from an inner side of the carcass cord to an outer side of the carcass cord. The edge wrapping strip includes an inner edge wrapping strip and an outer edge wrapping strip, wherein the inner edge wrapping strip is sandwiched between the carcass cord and the apex strip and is wound from the inner side of the apex strip to the outer side of the apex strip, and the outer edge wrapping strip is sandwiched between the carcass cord and the bead chafer and connects to the inner wrapping edge strip at the carcass- cord upper end point. By means of the edge wrapping strip, the problems of stress concentration and excessive temperature at the carcass-cord end point are alleviated, thereby improving the durability performance, service life, and safety of the tire.

Description

pneumatic tires

The present invention relates to a tire, in particular to a pneumatic tire with a bead reinforcement structure.

Due to the concentrated stress and excessive temperature in the bead part of heavy-duty tires under their load and speed, cracks, or even detachment and breakage, often occur at the end points of the carcass cord roll or the turn-up ends of the steel wire anti-friction layer.

In order to reduce cracks, Chinese Patent Publication No. CN 109910523 A and CN 104442217 A respectively proposed the following solutions.

The aforementioned CN 109910523 A patent case mainly increases the wedge-shaped component so that the wedge-shaped component is sandwiched by the inner steel wire bead wrapper and the steel wire carcass ply on the outside of the tire width direction of the bead core, and forms a top end facing the roll-in side. Tapered shape. Even if an inward force is exerted on the steel carcass ply, the wedge-shaped member and the inner steel bead will function as a stopper to prevent falling off, improving the durability of the tire.

The aforementioned CN 104442217 A patent case mainly covers the outer turn-up edge of the steel wire wrapping cloth and laminated a layer of film inside. The outer turn-up end point of the steel wire wrapping cloth is higher than the turn-up end of the carcass ply. point. It can increase the adhesion of the sidewall of pneumatic tires, and also greatly reduce the phenomenon of steel wire wrapping cloth endpoint rubber discounting, reducing the incidence of sidewall defects.

The purpose of the present invention is to provide a solution that is different from the two aforementioned patent cases, so as to alleviate problems such as stress concentration and excessive temperature caused by turn-up points, and improve the service life and safety of tires.

Therefore, in order to improve the service life and safety of the tire, the inventor proposes a pneumatic tire with a center line. The pneumatic tire includes: a carcass cord; an apex rubber, combined with the carcass cord, and the carcass cord automatically The inner side of the apex rubber is wound to the outer side of the apex rubber to form a carcass ply roll with an upper end point away from the center line; a steel wire anti-scuff layer is combined with the carcass ply, and the steel wire anti-scuff layer is formed from the carcass ply. The inner side of the carcass cord is wrapped around the outer side of the carcass ply; and a covering edge glue includes a connected inner side covering side glue and an outer side covering side glue, and the inner side covering side glue is combined with the carcass ply and the triangle. between the rubber, and winding from the inner side of the apex rubber to the outer side of the apex rubber, the outer covering edge rubber is combined between the carcass ply and the steel wire anti-friction layer, and the inner covering edge rubber is connected to the outer side The covering edge glue is connected to the upper end point of the carcass ply roll.

Further, the pneumatic tire is combined with a steel ring, the steel ring has a steel ring diameter position, a bead ring is arranged below the apex rubber, there is a bead ring height between the bead ring and the steel ring diameter position, the package The inner side-covering tape of the edge-covering tape has an end point of the inner side-covering tape located on the inside of the apex tape, and the end point of the outer side-covering tape of the edge-covering tape is located on the inside of the apex tape. On the outside, there is a height of the inner covering edge glue between the end point of the inner covering edge glue and the diameter position of the steel ring, and there is a height of the outer covering edge glue between the end point of the outer covering edge glue and the diameter position of the steel ring; the inner side The ratio of the height of the outer side rubber to the height of the bead is between 0.39 and 1.87, and the ratio of the height of the outer side rubber to the height of the bead is between 0.37 and 1.

The ratio of the height of the inner side rubber covering to the height of the bead is between 0.39 and 1, and the ratio of the height of the outer side rubber covering and the height of the bead is between 0.37 and 0.6.

Further, the carcass ply has a carcass ply length, the inner side covering edge rubber has an inner side covering side rubber length, the outer side covering side rubber has an outer covering side rubber length; the inner side covering side rubber length is the same as the length of the tire covering edge rubber. The ratio of the length of the body cord is between 0.07 and 0.11, and the ratio of the length of the outer side covering edge glue and the length of the inner side covering side glue is between 0.31 and 0.73.

Wherein, the ratio of the length of the outer side covering edge glue to the length of the inner side covering side glue is between 0.31 and 0.46.

Wherein, the inner side covering glue has an inner side covering glue thickness, the outer side covering glue has a thickness of the outer side covering glue, and the thickness of the inner side covering glue and the thickness of the outer side covering glue are both between 0.5 mm. to 1.5 mm.

Wherein, the thickness of the inner covering edge tape is between 0.5 mm and 1 mm.

Wherein, the edge-coating glue is a soft film.

Wherein, the inner side-covering edge glue and the outer side-covering edge glue are integrally formed into the side-covering side glue.

According to the above technical characteristics, the following effects can be preferably achieved:

1. By covering the edge rubber, problems such as stress concentration and excessive temperature at the upper end of the carcass cord roll are alleviated, the strength of the bead against high loads is enhanced, the durability of the bead is improved, and the service life of the tire is further extended and safety.

2. The covering edge rubber system is formed in one piece, forming a wide range of intervals between the inner and outer sides of the apex rubber, between the apex rubber and the carcass ply, and between the carcass ply and the steel wire anti-friction layer, which can increase the structure of the pneumatic tire. the adhesion between them.

3. Since the edge covering rubber is a soft film and is wound from the inside of the apex to the outside, it can prevent foreign rubber materials from penetrating into the carcass ply.

The present invention:

100:Pneumatic tires

1:Carcass cord

11: Upper end point of carcass cord roll

2: apex glue

3: Bead ring

4: Steel wire anti-friction layer

5: Covering edge glue

51: Inner side covering edge glue

511: Inner side covering edge glue endpoint

52:Outside covering edge glue

521: End point of outer covering edge glue

6: fetal lip

CL: center line

H: Bead ring height

H1: Height of inner covering edge glue

H2: Height of outer covering edge glue

RD: steel ring diameter position

Known techniques:

1’: Carcass ply

2’: apex glue

[Figure 1] is a cross-sectional view of an embodiment of the present invention, illustrating a pneumatic tire.

[The second figure] is a partially enlarged view of the first figure according to the embodiment of the present invention.

[The third picture] is a photo of an embodiment of the present invention, showing that the dissimilar rubber material has not penetrated into the carcass ply.

[The fourth picture] is a photo of the conventional technology, showing that the dissimilar rubber material penetrates into the carcass ply.

Based on the above technical features, the main functions of the pneumatic tire of the present invention will be clearly demonstrated in the following embodiments.

Please refer to the first and second figures, which illustrate a pneumatic tire 100 according to an embodiment of the present invention. The pneumatic tire 100 has a center line CL. The structure shown in the first figure is combined with a steel ring (not shown). The ring has a steel ring diameter position RD that is perpendicular to the center line CL.

The pneumatic tire 100 includes a carcass cord 1, an apex rubber 2, a bead ring 3, a steel wire anti-scuff layer 4, an edge cover 5 and a bead 6, wherein the apex rubber 2, the tire bead 6 The number of the lip ring 3, the steel wire anti-friction layer 4, the covering edge rubber 5 and the bead 6 is one pair, and they are all symmetrical with the center line CL as the axis of symmetry.

The pneumatic tire 100 is coupled to the steel rim via the bead 6, and the carcass ply 1 has a carcass ply length.

The apex rubber 2 is combined with the carcass ply 1, and the carcass ply 1 is wound from the inside of the apex rubber 2 to the outside of the apex rubber 2, forming a carcass ply roll with the upper end 11 away from the center line CL. The inner side refers to the side close to the center line CL, and the outer side refers to the side far away from the center line CL.

The bead 3 is arranged below the apex 2, and there is a maximum bead height H between the bead 3 and the diameter position RD of the steel ring.

The steel wire anti-scuff layer 4 is combined with the carcass ply 1 , and the steel wire anti-scuff layer 4 is wound from the inside of the carcass ply 1 to the outside of the carcass ply 1 .

The covering edge rubber 5 includes an inner covering edge rubber 51 and an outer covering edge rubber 52 that are connected and integrally formed. The inner covering edge rubber 51 is combined between the carcass ply 1 and the apex rubber 2. The outer covering edge rubber 52 is combined between the carcass ply 1 and the steel wire anti-friction layer 4 . In a preferred embodiment of the present invention, the covering edge rubber 5 is a soft film, such as a natural rubber material, or a synthetic rubber mainly made of polyisoprene, which can be copolymerized by the monomer isoprene. etc.

The inner side-coating edge glue 51 has an inner side-coating side glue endpoint 511 located on the inside of the apex tape 2 , and the outer side-coating side glue 52 has an outer side-coating edge glue endpoint 521 located on the outside of the apex tape 2 . The covering edge tape 51 extends from the end point 511 of the inner covering edge tape, and winds from the inside of the apex tape 2 to the outside of the apex tape 2, and then reaches the upper end point 11 of the carcass ply roll and then wraps with the outside edge tape. The edge glue 52 is connected, and the outer covering edge glue 52 extends from the upper end point 11 of the carcass ply roll to the end point 521 of the outer covering edge glue.

There is an inner coating edge glue height H1 between the inner coating edge glue end point 511 and the steel ring diameter position RD, and there is an outer coating edge glue height H1 between the outer coating edge glue end point 521 and the steel ring diameter position RD. H2. The ratio of the inner side covering edge rubber height H1 to the bead ring height H is between 0.39 and 1.87, preferably between 0.39 and 1; if it is lower than 0.39, the inner side covering edge rubber 51 Difficult to cover tires Lip ring 3 has poor protection against the penetration of dissimilar rubber materials; if it is higher than 1, the heat dissipation of the apex 2 is poor. The ratio of the outer side rubber height H2 to the bead height H is between 0.37 and 1, preferably between 0.37 and 0.6; if it is lower than 0.37, the pneumatic tire 100 will be The fit of the steel ring is poor; if it is higher than 0.6, the adhesion between the carcass cord 1 and the steel wire anti-friction layer 4 will be poor.

The inner side coating 51 has an inner side glue length, and the outer side glue 52 has an outer side glue length. The ratio of the length of the inner side covering edge rubber to the length of the carcass ply is between 0.07 and 0.11. The ratio of the length of the outer covering edge rubber to the length of the inner covering edge rubber is between 0.31 and 0.73, preferably between 0.31 and 0.46; if it is lower than 0.31, the carcass ply 1 and the The adhesion of the steel wire anti-scuff layer 4 will be poor; if it is higher than 0.46, the fit between the pneumatic tire 100 and the steel ring will be poor.

More clearly define the length of the carcass ply, the length of the inner side covering edge rubber and the length of the outer covering side rubber: the length of the carcass ply refers to the end point of the carcass ply roll from one side of the carcass ply 1 11. The total length of the carcass cord roll wound to the upper end point 11 of the other side; the length of the inner side covering edge rubber refers to the length of the inner side covering side rubber 51 from the end point 511 of the inner side covering side rubber to the tire. The length of the upper end point 11 of the body ply roll; the length of the outer covering edge glue refers to the length of the outer covering edge glue 52 from the upper end point 11 of the body ply roll to the end point 521 of the outer covering edge glue.

The inner side coating 51 has an inner side glue thickness, and the outer side glue 52 has an outer side glue thickness. The thickness of the inner side glue and the thickness of the outer side glue are both between Between 0.5 mm and 1.5 mm, preferably between 0.5 mm and 1 mm; if it is lower than 0.5 mm, the covering edge glue 5 has poor protection against the penetration of dissimilar rubber; if it is higher than 1 mm, Then the heat dissipation of the apex 2 is poor, and the fit between the pneumatic tire 100 and the steel ring is also poor.

When molding the pneumatic tire 100, the edge rubber 5 can be wrapped on the carcass ply 1 as a whole, and then the carcass ply 1 and the steel wire anti-friction layer 4 can be combined, and the apex rubber can be used in advance. 2 covers the bead ring 3 as a whole. Finally, the carcass ply 1, the steel wire anti-friction layer 4 and the apex 2 are combined.

Please use Table 1 below to actually test the pneumatic tire 100 of the present invention and a conventional technology (not shown). The only difference between the conventional technology and the pneumatic tire 100 of the present invention is that the conventional technology does not have a device. There is the covering edge glue 5.

In Table 1 below, the inner cladding and edge rubber height ratio field refers to the ratio of the inner cladding and edge rubber height H1 to the bead ring height H, and the outer cladding and edge rubber height ratio field refers to the ratio of the outer cladding and edge rubber height H1. The ratio of the edge rubber height H2 to the bead ring height H. The bead ring height H is 18.6 mm. The comparison column in Table 1 below refers to the ratio compared to the conventional technology. The larger the value, the better the durability performance. The test conditions are 106% of standard wind pressure and 100% of load.

Taking the mileage traveled as an example, the durability performance of the conventional technology is only 6535 kilometers, while the durability of the pneumatic tire 100 of the present invention is increased to 8870 kilometers. Compared with the conventional technology, the durability of the pneumatic tire 100 of the present invention is Performance improved by 36%.

Please refer to the second, third and fourth figures. The third figure is a photo of the pneumatic tire 100 of the present invention, indicating that the dissimilar rubber material has not penetrated into the carcass ply 1. The fourth figure is a photo of the conventional technology. The photo shows that the dissimilar rubber material has penetrated into the carcass ply 1'.

Since the covering edge rubber 5 is a soft film and is wound from the inside to the outside of the apex rubber 2 , dissimilar rubber materials, such as the rubber material of the apex rubber 2 , can be prevented from penetrating into the carcass ply 1 . It can also be seen from the third figure that even after the pneumatic tire 100 of the present invention is vulcanized, there is no penetration of dissimilar rubber.

However, this conventional technology does not include the covered edge rubber 5 of the present invention. As shown in the fourth figure, after vulcanization, the dissimilar rubber material, such as the rubber apex 2', penetrates into the carcass ply. 1', causing the adhesion of the carcass ply 1' to be affected and the rigidity to be weakened, and may even further cause damage to the rubber at the end point 11 of the carcass ply roll.

Please refer to the second figure again. Since the covering edge rubber 5 is formed in one piece, there is a gap between the inner and outer sides of the apex rubber 2, between the apex rubber 2 and the carcass ply 1, and between the carcass ply 1 and the steel wire. A wide range of intervals is formed between the anti-friction layers 4, which can increase the adhesion between the various structures of the pneumatic tire 100.

By covering and protecting the upper end point 11 of the carcass ply roll with the covered side rubber 5, the stress can be effectively released and slowed down, preventing foreign rubber materials from penetrating into the carcass ply 1 and causing a decrease in rigidity, thereby enhancing the resistance of the bead 6. The high load strength improves the durability of the bead ring 3 and further improves the service life and safety of the pneumatic tire 100 .

Based on the description of the above embodiments, the operation, use and effects of the present invention can be fully understood. However, the above embodiments are only preferred embodiments of the present invention and should not be used to limit the implementation of the present invention. The scope, that is, simple equivalent changes and modifications based on the patent scope of the present invention and the description of the invention, are all within the scope of the present invention.

100:Pneumatic tires

1:Carcass cord

11: Upper end point of carcass cord roll

2: apex glue

3: Bead ring

4: Steel wire anti-friction layer

5: Covering edge glue

51: Inner side covering edge glue

511: Inner side covering edge glue endpoint

52:Outside covering edge glue

521: End point of outer covering edge glue

6: fetal lip

H: Bead ring height

H1: Height of inner covering edge glue

H2: Height of outer covering edge glue

RD: steel ring diameter position

Claims (9)

A pneumatic tire has a centerline. The pneumatic tire includes: a carcass cord; and an apex rubber, which is combined with the carcass ply. The carcass ply is wound from the inside of the apex rubber to the outside of the apex rubber to form an apex. The upper end point of the carcass ply roll is away from the center line; a steel wire anti-scuff layer is combined with the carcass ply, and the steel wire anti-scuff layer is wound from the inside of the carcass ply to the outside of the carcass ply; and a covering edge The glue includes a connected inner side covering glue and an outer side covering glue. The inner side covering glue is combined between the carcass cord and the apex rubber, and is wound from the inside of the apex rubber to the apex rubber. On the outside, the outer side-covering edge rubber is combined between the carcass ply and the steel wire anti-friction layer, and the inner side-covering edge rubber and the outer side-covering edge rubber are connected to the upper end of the carcass ply roll. The pneumatic tire as described in claim 1, further, the pneumatic tire is combined with a steel ring, the steel ring has a steel ring diameter position, a bead ring is disposed below the apex rubber, the bead ring and the steel ring diameter There is a bead height between the positions, the inner side covering edge rubber of the covering edge rubber has an inner covering edge rubber endpoint located inside the apex rubber, and the outer covering edge rubber of the covering edge rubber has an outer covering edge rubber. The end point of the edge covering glue is located on the outside of the apex tape. There is a height of the inner side covering glue between the end point of the inner side covering edge glue and the diameter position of the steel ring. There is a height between the end point of the outer side covering edge glue and the diameter position of the steel ring. There is an outer side rubber coating height; the ratio of the inner side rubber coating height to the bead ring height is between 0.39 and 1.87, and the ratio of the outer side rubber coating height to the bead ring height is between 0.37 and between 1. The pneumatic tire as claimed in claim 2, wherein the ratio of the height of the inner side rubber to the height of the bead is between 0.39 and 1, and the ratio of the height of the outer side rubber to the height of the bead is between 0.39 and 1. Between 0.37 and 0.6. The pneumatic tire according to claim 1, further, the carcass ply has a carcass ply length, the inner covering side rubber has an inner covering side rubber length, and the outer covering side rubber has an outer covering side rubber length; The ratio of the length of the inner side rubber covering to the length of the carcass ply is between 0.07 and 0.11, and the ratio of the length of the outer side rubber covering and the length of the inner side rubber covering is between 0.31 and 0.73. The pneumatic tire as claimed in claim 4, wherein the ratio of the length of the outer covering edge rubber to the length of the inner covering edge rubber is between 0.31 and 0.46. The pneumatic tire as claimed in claim 1, wherein the inner side covering edge glue has an inner side covering side glue thickness, the outer side covering side glue has an outer side covering side glue thickness, the inner side covering edge glue thickness and the outer side covering side glue thickness. The thickness of the edge covering tape is between 0.5 mm and 1.5 mm. The pneumatic tire as claimed in claim 6, wherein the thickness of the inner side covering edge rubber is between 0.5 mm and 1 mm. The pneumatic tire as claimed in claim 1, wherein the covering edge rubber is a soft film. The pneumatic tire according to claim 1, wherein the inner side covering edge rubber and the outer side covering edge rubber are integrally formed into the covering edge rubber.