CN102294942A - Tire with additional cap ply - Google Patents

Abstract

The invention discloses a tire with an additional cap ply. At least one layer of additional cap ply is additionally arranged between a second belted layer and a third belted layer to improve the anti-distortion and anti-tearing capabilities of a region during loading and stress bearing. Particularly, at least a layer of additional cap ply is respectively lined among a rubber pad, two sides of the third belted layer and a tread rubber. The additional cap ply is respectively wound on the sides of the third belted layer and the second belted layer at both sides of the tire periphery so as to optimize the grounding shape of the tire, improve the use safety performance, and effectively solve the problems of separation and tearing of the belted layer.

Description

Tires with additional cap plies

technical field

The invention relates to the improvement of the structure of the all-steel radial tire, that is, at least one additional cap layer is wound around the sides of the second belt layer and the third belt layer, which are prone to delamination and fracture, and belongs to the field of rubber tire manufacturing.

Background technique

Existing usually manufactures, uses the all-steel radial tire, and its tire crown that contacts ground is ellipse or rectangular shape. When the vehicle reaches a certain load, the tires will correspondingly produce radial deformation, so that it is easier to cause delamination and fracture between the belt layers, and in serious cases, it will directly lead to tire blowout and bring hidden dangers of driving accidents.

A large number of studies have found that the delamination and fracture areas caused by excessive concentration of stress points during tire running first occur between the second belt layer and the third belt layer, and then spread to adjacent areas. Therefore, how to improve the ability of this area to withstand pressure and deformation and reduce the probability of delamination and fracture caused by excessive deformation will directly affect the safety, stable operation and service life of the tire.

Contents of the invention

The present invention provides a tire with an additional cap layer, in order to solve the above problems and defects and add at least one additional cap layer between the second belt layer and the third belt layer to increase the load and pressure of this area The anti-deformation and anti-tearing ability, the additional cap layer wound along the circumferential direction of the side of the tire can effectively balance the stress distribution.

The purpose of the present invention is to improve the compression and deformation resistance of the area between the second belt layer and the third belt layer, avoid delamination and fracture problems caused by the increase of vehicle load, and ensure The safety performance and prolong the service life of tires.

In order to achieve the purpose of the above invention, the tire with an additional cap layer includes tread rubber, a fourth belt layer, a third belt layer, a second belt layer, and a pair of tires in sequence from the crown to the rim. Side pads and first belt.

The difference from the prior art is that at least one additional cap layer is respectively lined between the pad rubber, the two sides of the third belt layer and the tread rubber.

On both sides in the tire circumferential direction, the additional cap layer is wound 360° around the sides of the third belt layer and the second belt layer respectively.

As in the above-mentioned basic improvement scheme, the added additional cap layer tightly wraps the side edges of the third belt layer and the second belt layer respectively along both sides of the tire circumferential direction. When there is a tendency of delamination and fracture, the additional cap layer can effectively share the stress on the third belt layer and the second belt layer, and avoid excessive concentration of stress points acting on the two belt layers.

In order to further improve the stretch resistance and tear resistance of the additional cap layer itself, and also in order to improve the connection tightness when winding the third belt layer and the second belt layer, the following improvement schemes can be adopted:

The additional cap layer is formed by lapping 2 layers of nylon cords, the length of each layer of nylon cords is (A), and the width is (I). In the circumferential direction of the tire, the 2 layers of nylon cords (1) The longitudinal joint distance is (H),

but $\frac{1}{12}\≤\frac{h}{A}\≤\frac{11}{12}$

The two-layer nylon cord fabric lapped according to the above specifications has high tensile performance in the circumferential direction of the tire, and also takes into account the tear resistance in the radial direction of the tire.

A further optimization measure is that the width of the third belt layer is (D), the width of the second belt layer is (C), and the width of the additional cap layer after the two layers of nylon plies overlap each other is ( B),

but $B>\frac{C-\mathrm{D.}}{2}$

According to the requirements of the above specifications, when the additional cap layer is wound 360° around the sides of the third belt layer and the second belt layer, the additional cap layer can also be wound to the third belt layer and the second belt layer. The radial return elastic force is transmitted between them. That is, when a certain radial deformation occurs due to vehicle load and tire pressure, the radial deformation of the third belt layer and the second belt layer can be reduced by adding a cap layer.

In order to improve the stable connection performance after two layers of nylon cords are overlapped with each other, in each nylon cord layer (1), the nylon cords are parallel to the sides of the nylon cords;

The longitudinal cutting angle of the nylon ply is less than or equal to 90°.

Considering the stress distribution between the existing tire multi-layer rubber materials, the side distances between the additional cap layers on both sides and the fourth belt layer are respectively greater than or equal to 1 mm.

In summary, the present invention has the advantage that the tire with an additional cap layer is that by adding at least one additional cap layer, the deformation resistance and tear resistance between the second belt layer and the third belt layer can be improved. Crack ability, thereby effectively reducing the delamination and fracture problems caused by the increase of vehicle load, ensuring tire stability and vehicle safety during high-speed driving, and prolonging the service life of tires.

Description of drawings

Fig. 1 is the schematic diagram that described additional band ply is lapped by 2 layers of nylon plies;

Fig. 2 is the sectional structure drawing of described tire;

Fig. 3 is a tire cross-sectional schematic diagram;

As shown in Figures 1 to 3, nylon ply 1, additional cap layer 2, tread rubber 4, fourth belt layer 3, third belt layer 5, second belt layer 6, pad rubber 7, first belt layer 8;

In Fig. 1 and Fig. 3, A is the length of each layer of nylon ply 1,

B is the width of 2 layers of nylon ply 1 overlapping each other to form an additional cap layer 2,

C is the width of the second belt layer 6,

D is the width of the third belt layer 5,

E is the side distance between the additional cap layer 2 and the fourth belt layer 3,

F is the side of nylon ply 1,

G is the longitudinal cutting angle of nylon ply 1,

H is the longitudinal joint distance of nylon ply 1,

I is the width of each nylon ply 1.

Detailed ways

Embodiment 1, as shown in Figures 1 to 3, a tire with an additional cap layer includes a tread rubber 4, a fourth belt layer 3, a third belt layer 5, a Two belt layers 6 , a pair of sidewall pads 7 and a first belt layer 8 .

Wherein, between the pad rubber 7 , the two sides of the third belt layer 5 and the tread rubber 4 , an additional cap layer 2 is lined respectively.

That is, on both sides in the tire circumferential direction, the additional cap layer 2 is wound on the sides of the third belt layer 5 and the second belt layer 6 at 360° respectively.

The additional cap layer 2 is formed by lapping two layers of nylon plies 1, the nylon cords in each nylon ply 1 are kept parallel to the side F, and the longitudinal cutting angle G of the nylon ply 1 is ≤ 90°.

on the circumference of the tire,

Width of additional cap ply 2 after 2 layers of nylon plies 1 overlap each other

The side distance E between the additional cap layers 2 on both sides and the fourth belt layer 3 is greater than or equal to 1 mm.

When the third belt layer 5 and the second belt layer 6 tend to be delaminated or fractured, the additional cap layer 2 can effectively share the stress acting on them, avoiding potential safety hazards caused by excessive concentration of stress points.

Claims (5)

1. A tire with an additional cap layer, which sequentially includes a tread rubber (4), a fourth belt layer (3), a third belt layer (5), and a second belt layer from the crown to the rim layer (6), a pair of sidewall pads (7) and the first belt layer (8), characterized in that: Between the pad rubber (7), the two sides of the third belt layer (5) and the tread rubber (4), at least one additional cap layer (2) is respectively lined, On both sides in the tire circumferential direction, the additional cap layer (2) is wound 360° around the side edges of the third belt layer (5) and the second belt layer (6) respectively. 2. The tire with additional cap ply according to claim 1, characterized in that: the additional cap ply (2) is formed by lapping two layers of nylon ply (1), and each layer of nylon ply (1) has length (A) and width (I), In the circumferential direction of the tire, the longitudinal joint distance of the two layers of nylon ply (1) is (H), but $\frac{1}{12}\≤\frac{h}{A}\≤\frac{11}{12}.$ 3. The tire with an additional cap layer according to claim 2, characterized in that: the width of the third belt layer (5) is (D), and the width of the second belt layer (6) is ( C), the width of the additional cap layer (2) after 2 layers of nylon plies (1) overlap each other is (B), but $B>\frac{C-\mathrm{D.}}{2}.$ 4. The tire with additional cap ply according to claim 3, characterized in that: in each nylon ply (1), the nylon cord is parallel to the side (F) of the nylon ply (1); The longitudinal cutting angle of the nylon ply (1) is (G), then G≤90°. 5. The tire with additional cap layers according to claim 1, 2, 3 or 4, characterized in that: the side distance between the additional cap layers (2) on both sides and the fourth belt layer (3) is E, then E≥1 mm.

Images