RU2481963C2 - Pneumatic tire cover - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to trick tires of radial design with multilayer carcass from rubberized all-texture cord. Proposed tire comprises multilayer carcass from rubberised all-texture cord consisting of, at least, three layers and one bad ring on every bead side. The number of cord layers in carcass outer set of layers lapped under bead ring exceeds that of cord inner set of layers lapped onto bead ring.

EFFECT: longer life, decreased labor input.

3 dwg

Description

The invention relates to the automotive industry, namely to pneumatic truck tires of radial design with a multilayer carcass of rubberized textile cord.

Known designs of the side of the truck radial tires with a multilayer carcass made of rubberized textile cord with various bead patterns and various structural options for reinforcing the side of the tire to increase durability No. 2022808, IPC В60С 15/00).

A disadvantage of the known pneumatic tire tire designs is the large number of special reinforcing parts of the tire bead in order to increase durability. This leads to a significant complication of the design of the side. The manufacture of such tires has considerable labor and energy intensity, the issue of insufficient durability becomes essential in the operation of such tires.

The closest in technical essence and the achieved result to the present invention is a technical solution for tires of a pneumatic tire of a radial design according to the patent of the Russian Federation No. 2359841, IPC ВС 9/08, publ. 06/27/2009

The known tire of a pneumatic tire of radial construction contains a tread, a breaker, sidewalls, a carcass consisting of the outer and inner groups of layers of rubberized cord, side rings. The frame is made of three layers of rubberized cord and contains one inner and one outer group of cord layers, the number of cord layers of the carcass of the inner and outer groups of at least one and no more than two, while the frame is made of cord layers with a tensile strength of the thread of at least 20 and no more than 35 kgf / thread and a total frequency of cord threads of at least 225 and no more than 336 pieces over a length of 100 mm, while at least one layer of the inner group of the frame is wrapped on the bead ring and at least one layer of the outer group of the frame is wrapped under the bead a face, and the number of side wires in the section of the side ring is not less than 85 and not more than 100 pcs.

The disadvantage of the prototype is the lack of durability of the design of the sideboard zone of the tire, as well as increased material consumption, energy consumption and the complexity of manufacturing tires of a pneumatic tire.

The technical problem to which the proposed invention is directed, is to increase the durability of the sideboard zone of the tire and reduce the complexity and material consumption of tire manufacturing.

The stated technical problem is solved in that in the tire cover of a pneumatic tire of a radial structure, comprising a multilayer carcass of rubberized textile cord, consisting of at least three layers and one bead ring on each side of the bead part, according to the invention, the number of cord layers of the outer group of carcass layers, wrapped under the bead ring, exceeds the number of cord layers of the inner group of carcass layers wrapped on the bead ring.

The technical result, the achievement of which is ensured by the implementation of the entire claimed combination of features, consists in reducing the number of parts of the side zone of the tire, which increases the durability of the sideboard zone of the tire and reduces the material consumption and the complexity of manufacturing the tire.

The invention is illustrated by drawings, where

figure 1 presents a diagram of the sideboard zone of the tire 12,00R20 of the proposed technical solution;

figure 2 presents a diagram of the sideboard zone of the tire 12,00R20 of the prototype

figure 3 presents the characteristics of the deformed state (a), heating temperature (b) and durability (c) of the prototype and the design of the tire 12,00R20 with the proposed technical solution for simulating bench tests for the side performance (double load, speed 50 km / h) .

Figure 1 contains the following positions:

1 - sidewall

2 - the outer layers of the rubberized cord of the multilayer frame

3 - the inner layers of the rubberized cord of the multilayer frame

4 - filling cord

5 - side rings

6 - rubber parts between the outer layers 2 and the inner layers 3 of the rubberized cord of the multilayer frame

7 - wing cord ribbons

Figure 2 (prototype) contains the following positions:

8 - sidewall

9 - the outer layers of the rubberized cord of the multilayer frame, the prototype includes two layers

10 - the inner layer of the rubberized cord of the multilayer frame, the prototype includes one layer

11 - filling cord

12 - side rings

13 - wing cord ribbons

14 - reinforcing side ribbons

The tire cover of the pneumatic tire (Fig. 1) in the sideboard area includes sidewalls 1, a multilayer carcass consisting of at least three layers of rubberized textile cord and containing outer layers 2 and inner layers 3 of rubberized cord, filler cords 4, side rings 5, rubber parts 6 located between the outer layers 2 and the inner layers 3 of the rubberized cord of the multilayer frame, wing cord ribbons 7.

The prototype (figure 2) has the number of inner layers of the carcass cord - 2, the number of outer layers of the carcass cord - 1.

The number of cord layers of the outer group of carcass layers wrapped under the bead ring exceeds the number of cord layers of the inner group of carcass layers by at least one layer wrapped on the bead ring.

This solution allows to reduce the magnitudes of the deformation amplitudes in the tire bead parts, which in turn reduces the working temperature in this zone. This together allows you to increase the durability of the side zone of the tire in operation (figure 3). In addition, this solution allows to reduce the number of side tapes or eliminate them altogether, which reduces the material consumption and labor intensity of the tire. Also, a smaller number of layers of the inner group reduces the amount of carcass material necessary for the manufacture of one tire (for example, for tires 12.00R20 by 2.3 kg).

Examples of specific performance of cargo pneumatic tires with a multilayer carcass are given in the table.

Table 1. Design parameters of prototypes and proposed technical solutions Tire size Prototype An example of the implementation of the proposed technical solution The number of cord layers of the inner group of carcass layers The number of cord layers of the outer group of carcass layers Service life
board numbers, thousand km The number of layers of the cord inner
wireframe layer groups The number of cord layers of the outer group of carcass layers Longevity by the method of onboard performance, thousand km one 2 3 four 5 6 5 12,00R20 3 2 3 one 7.1 one 3 15.0 2 2 one 2 2 one 11,00R20 3 2 3 one 3.3 one 3 10.6 2 2 5.5 one 2 8.7 2 one 10,00R20 3 2 6.4 3 one 4.2 2 2 one 3 2 one 5,4 one 2 12,2 9,00R20 3 one one 2 2 2 5.9 one 3 8.0 2 one 8.25R20 3 2 2,4 2 one 5.1 one 2 7.6

A comparative analysis of the proposed invention with the prototype (see table) shows that the inventive tire of a pneumatic tire with a radial design is characterized in that the number of cords of the outer group of carcass layers exceeds the number of cords of the inner group of carcass layers by 1-2 layers (12,00R20). In this case, the mass of the layers of the rubberized cord of the frame is reduced, for example, for 12.00R20 by 2.3 kg, and the weight of the tire is 3.1 kg less than that of the prototype, and the overall performance is higher than that of the prototype. In this case, the energy consumption and the complexity of the production of tire carcasses is reduced in proportion to the decrease in the area of rubberized cord materials. The overall complexity of tire production is also reduced by reducing the time to produce a smaller area of rubberized materials (frame layers and side tapes).

The proposed constructive implementation of the overboard tire tire cover zone allows for mass production without changing the existing technology and to achieve an economic effect, ensured by a significant gain in tire weight, labor and energy consumption of production, and increased tire durability.

Claims (1)

Tire of a pneumatic tire of radial construction, including a multilayer carcass of rubberized textile cord, consisting of at least three layers and one bead ring on each side of the bead part, characterized in that the number of layers of the cord of the outer group of carcass layers wrapped under the bead ring exceeds the number of layers cords of the inner group of carcass layers wrapped on the bead ring.

Images