RU2239569C2 - Radial-ply pneumatic tire casing - Google Patents

Abstract

FIELD: tire industry.

SUBSTANCE: invention relates to pneumatic tires, particularly to radial-ply casings with textile breaker. According to invention, mass of textile reinforcement material in breaker, without consideration of mass of rubber in breaker, is 4.0 8.0% of casing mass. Positive result of use of proposed invention in tires with textile breaker manufactured at tire building plant is 30-90% increase of tire run at minimum changes of cost of production.

EFFECT: increased wear resistance and run of tire.

1 tbl, 1 dwg

Description

The invention relates to pneumatic tires, in particular to tires of a radial design with a textile breaker.

A known tire of a pneumatic tire of radial construction, containing a rubberized textile reinforcing material in the breaker, with a ratio of the weight of the reinforcing material of the breaker, without regard to the mass of rubber in the breaker, to the weight of the tire is less than 4% - [1, 2, 3], [4 - prototype].

From the materials given in the analogues, it follows that in the future the tires P were also made entirely of textile cord, that the type P tire has a significant economic advantage over the diagonal tire, since its carcass can have half as many layers [1], which is the main power the element in the tire P is a breaker, which, forming a hard belt, increases the contact area of the treadmill with the road, contributes to a more uniform distribution of pressure on the contact area, reduces slippage of the protector elements Ktorov nip, increases the lateral stability.

All this increases the wear resistance of radial tires by 1.5-2 times in comparison with the wear resistance of tires of a diagonal design [2].

The advantage of radial tires in comparison with diagonal tires is an average of 5 wt.% Less material consumption for their manufacture [3].

It is known that in the conditions of competition of tire manufacturers, the main thing is to increase the operational quality of tires and reduce the cost of their production.

The experience of the development of world tire production and the materials given in analogues show: when replacing tires of a diagonal design with tires of a radial design with a textile breaker, the wear resistance and tire mileage increase by 1.5 times.

Structurally, when switching from tires of a diagonal design to tires of a radial design, as follows from the materials given in the analogues, the mass of the reinforcing material in the zone of the breaker is significantly increased.

The dependence of the positive influence of an increase in the mass of the reinforcing material of the breaker exists both for textile materials and for tires with a textile breaker.

Therefore, one of the defining means of increasing wear resistance and tire mileage in operation is to increase the mass of the reinforcing material of the breaker, and this dependence exists for all reinforcing materials used in tires.

Naturally, this dependence can also be used to solve the problem of reducing the weight of the tire.

As experience has shown, a direct decrease in weight in tire parts is associated with a decrease in wear resistance and tire mileage in operation, regardless of whether it was a simple decrease in tire weight or weight reduction associated with an increase in the specific strength of the reinforcing material.

As an example, Kevler and CBM reinforcing materials can be cited, the use of which with a decrease in ply and tire mass was accompanied by a decrease in wear resistance and tire mileage in operation.

Moreover, the reduction in tire mass can be solved in various ways:

- reducing the weight of the sidewalls and side parts of the tire,

- reduction in cord rubber gauges,

- a decrease in the ply of the frame is proportional to the strengthening of the breaker, etc.

- just as an increase in the mass of the reinforcing material in the zone of the breaker can be achieved by increasing the layering of the breaker, increasing the thickness of the reinforcing threads of the breaker, using shielding layers, for example, of polyamide cord. The latter is more effective, since the layers of the screen are located midline and the tire becomes as if more radial with an increase in its advantages compared to the diagonal.

The stated direction makes it realistic to pose the problem of increasing the wear resistance and mileage of radial tires with a textile breaker in operation to a level exceeding the wear resistance and mileage of diagonal tires by 2.0-2.5 times.

GOST 4754-97 interstate standard is given as an additional analogue. Pneumatic tires for cars, trailers for them, light trucks and buses of especially small capacity.

Technical conditions Radial tires, including those with textile breaker [5].

According to GOST 4754-97 and technological regulation No. 324Sh-2003, the Yaroslavl Tire Plant produces a large volume of competitive radial tires with a textile breaker and a ratio of the mass of the reinforcing material of the breaker to the weight of the tire below 4.0%.

A disadvantage of the known tire design and materials given in the analogues [1, 2, 3] and prototype [4] is the incompletely realized possibility of increasing their operational quality, in particular, wear resistance and mileage, in the operation of radial tire construction with a textile breaker.

The technical challenge facing tire manufacturers is the creation of a pneumatic tire tire with a radial design with a textile breaker with higher mileage.

The technical result is achieved by the fact that in the tire the mass of textile reinforcing material in the belt without taking into account the mass of rubber in the belt is 4.0-8.0% of the weight of the tire.

The invention is illustrated in the drawing, which shows a cross section of a tire of a pneumatic tire of a radial structure.

The proposed option tires includes a breaker of 6 layers of viscose cord 1 with a ratio of the mass of the reinforcing material of the breaker to the weight of the tire 5.06%, the tread 2 and the frame 3, the prototype includes a breaker of 2 bent layers of viscose cord 172BR with the ratio of the mass of the reinforcing material breaker to the mass of the tire 3.41%, tread 2 and frame 3.

The results of wear and performance tests of the proposed tires and prototype are shown in table 1.

The service life of the proposed tires compared with the prototype increased by 30-90%.

Sources of information

1. V.L. Biderman. Car tires. - M.: Goskhimizdat, 1963, p.21.

2. A.V. Saltykov. Fundamentals of modern technology for car tires. - M .: Chemistry, 1974, p. 46-47.

3. V.V. Ragulin, A.A. Volnov. Technology of tire production. - M.: Chemistry, 1981, p.31.

4. Technological regulation No. 324Sh-2003. “Production of passenger radial tires” of OJSC “Yaroslavl Tire Plant”. Validity is February 20, 2008, developed and registered in accordance with the regulations of the Ministry of Industry, Science and Technology of the Russian Federation, registered with OAO YaShZ in the department of the chief technologist and standardization in accordance with Instruction I15-2003 “Management of technological documentation”, in the inventory book registration of originals of technological regulations. Registration date 02/20/2003. Inventory No. 26 is a prototype.

5. GOST 4754-97. Interstate standard "Pneumatic tires for cars, trailers for them, light trucks and buses of especially small capacity." Technological conditions. Radial tires.

Claims (1)

Tire of a pneumatic tire of a radial construction, containing a rubber viscose cord in the breaker or its combination with a rubber polyamide cord or other rubberized textile reinforcing materials, characterized in that the mass of the reinforcing material of the belt without considering the mass of rubber in the belt is 4.0-8.0% of tire masses.