RU76600U1 - PROTECTOR TIRE RING FOR VEHICLES - Google Patents

Abstract

The utility model relates to the tire industry and can be used in the manufacture of new tires for vehicles and in the restoration of worn-out pneumatic tires. The tire tread ring for vehicles made of rubber comprises a tread pattern having a wearing part and a non-wearing part, and a trench layer. It is equipped with a reinforcing belt made of 1 ÷ 2 layers of rubberized reinforcing material with a width corresponding to the width of the undercut layer, and a rubber layer 1.0-1.5 mm thick duplicated with it, and hard abrasive granules distributed over the tread part are inserted its entire depth, while the tread ring is equipped with mini-sides. The reinforcing belt of the tread ring is made by single-layer spiral winding along the equator with a single rubberized cord cord with a winding pitch of 1.0 ÷ 10.0 mm, made two-layer in the form of two canvases of rubberized cord, in each of which the cord threads are located at an angle of 20 ÷ 25 ° to the equator , while the cord threads of one layer are crossed with the cord threads of another layer. The reinforcing material of the reinforcing belt is made of thin cables twisted from brass steel wire with a thickness of 0.15 ÷ 0.23 mm or from synthetic high modulus cord. The tread ring provides the restoration of tires with damaged or destroyed breaker layers during cold repair, provides the ability to manufacture new tires in a known modular manner, and due to the presence of solid granules provides good adhesion to slippery and wet roads.

1 n.a. 4 s.p. f-ly, 1 ill.

Description

The utility model relates to the tire industry and can be used in the manufacture of new tires for vehicles and in the restoration of worn-out pneumatic tires.

Known tread rings for restoring worn-out pneumatic tires containing a tread pattern and an undercut (see V.E. Evzovich Restoring worn-out pneumatic tires, Avtopolis-plus, M., 2005, pp. 111-115).

However, the known tread rings do not contain abrasive granules that increase grip, and can only be used to restore tires with a worn tread pattern that do not have damage to the carcass and breaker.

Another tread ring of a tire for vehicles made of rubber is known, containing a tread pattern having a wearing part and a wearing part, and a trench layer (see RU 2242374 C2, published. 04.20.2004).

However, the known tread ring also does not contain abrasive granules that increase adhesion to the road, and it cannot be used when restoring tires with a damaged belt.

The technical result of the claimed utility model is to increase the service life of a retreaded tire with a weakened carcass and belt, simplifying the process of restoring such a tire, providing good traction with slippery and wet roads.

The claimed technical result is achieved due to the fact that the tread ring of a tire for vehicles made of rubber, containing a tread pattern having a wearing part and a wearing part, and an undercut layer, according to a utility model, is equipped with a reinforcing belt made of 1 ÷ 2 layers of rubber

reinforcing material with a width corresponding to the width of the groove layer and a rubber layer 1.0–1.5 mm thick duplicated with it, and hard abrasive granules distributed throughout its depth are introduced into the wear part of the tread pattern, while the tread ring is equipped with mini sidewalls .

Also, the technical result is achieved due to the fact that the reinforcing belt is made by single-layer spiral winding along the equator with a single rubberized cord thread with a winding pitch of 1.0 ÷ 10.0 mm, the reinforcing belt is made two-layer in the form of two canvases of rubberized cord, in each of which the cord threads are located at an angle of 20 ÷ 25 ° to the equator, while the cord threads of one layer are crossed with the cord threads of another layer, and the reinforcing material of the reinforcing belt is made of layers of rubberized cord formed from thin cables twisted from latin nirovannoy steel wire thickness of 0.15 ÷ 0.23 mm, the reinforcing material is a reinforcing belt made of a synthetic high-modulus cords.

Figure 1 schematically shows a tread ring in the context; figure 2 - arrangement of filament cords in a single-layer reinforcing belt of the tread ring; figure 3 - arrangement of the filaments in the layers of the two-layer reinforcing belt of the tread ring.

The tire tread ring 1 for vehicles made of rubber contains a tread pattern having a wearing part 2 and a wearing part 3, and an undercut layer 4. Hard abrasive granules 5 are introduced into the wearing part 2 of the tread pattern distributed throughout its depth to the wear indicators 6. The tread ring 1 is provided with a reinforcing belt 7 made of 1 ÷ 2 layers of rubberized reinforcing material with a width corresponding to the width of the undercut layer 4. With a reinforcing belt 7, a layer 8 of rubber with a thickness of 1 was duplicated 0 ÷ 1.5 mm. The tread ring 1 is equipped with mini-sidewalls 9 and a protective layer 10 located on the outside of the tread

rings. The thickness of the layer 8 cannot be less than 1.0 mm, since in this case there is a danger of damage to the cord when preparing the tread ring for assembly. With a layer thickness of 8 more than 1.5 mm, the tire weight unreasonably increases, which increases heat generation and rolling loss. The protective layer 10 of the tread rubber mixture without granules with a thickness of 0.5-1.0 mm serves to protect the working surface of the mold from damage by the abrasive granules during vulcanization of the tread ring in it.

The tread ring with a reinforcing belt 7, made of one layer of rubberized reinforcing material, is intended for the restoration of tires that previously had one damaged layer of the broker or tires previously removed with a reduced margin of the carcass’s working capacity and with minor damage to the broker that did not require replacement of its layers.

The tread ring with a reinforcing belt 7, made of two layers of rubberized reinforcing material, is designed to restore tires in which two damaged layers of the broker were previously removed.

The reinforcing belt 7 can be performed in a single layer (Fig. 2) by spiral winding along the equator with a single rubberized cord thread 11 with a winding pitch t equal to 1.0 ÷ 10.0 mm. The winding pitch range of a single cord yarn provides strength characteristics of the reinforcing layer for both passenger and truck tires using various cord types.

The reinforcing belt 7 can be made two-layer (figure 3) in the form of two canvases of rubberized cord, in each of which the cord 11 is at an acute angle (β) 20 ÷ 25 ° to the equator, while the cord threads of one layer are crossed with the cord threads of another layer and the angle between the directions of the filaments of the cords of these layers (2 β) is 40-50 °.

The reinforcing material of the reinforcing belt 7 can be made of thin cables twisted from brass steel wire with a thickness of 0.15 ÷ 0.23 mm. The reinforcing material of the reinforcing belt 7 can also be made of synthetic high modulus cord having high strength and resistance to elongation, for example a cord of polyester or aramid fibers.

The hard granules of abrasive 5 introduced into wear part 2 of the tread pattern can be made of a high abrasive abrasive grinding grain, high hardness and increased brittleness, for example, boron carbide grinding stone, silicon carbide, AC2 synthetic diamonds, aluminum oxide.

The tread ring is under-vulcanized, i.e. vulcanization is carried out at 60-80% of the optimal vulcanization time. When using a tread ring to restore a tire, the pre-vulcanization of the ring is carried out in an autoclave simultaneously with its vulcanization with the tire carcass at an autoclave temperature of 100-120 ° C, used for “cold” tire restoration

The tread ring can be used for the production of new tires in a modular way, i.e. in the case when the manufacture of a vulcanized carcass blank is geographically separated from the final assembly and vulcanization of the tire. In this case, pre-vulcanization of the tread ring is carried out simultaneously with its vulcanization with the vulcanized carcass of the new tire.

An example of cutting a rubberized metal cord web using a reinforcing belt 7 of two layers of the 185/75 R16C tire for light trucks and small buses (see table).

Table Options First layer Second layer Thickness mm 1,6 1,6 Length mm 1965 1970 Width mm 148 132 Cutting angle, hail 70 70

The cutting angle is the angle between the cut line of the cord fabric and the perpendicular to the threads of its base; in the finished tread ring, the angle of inclination of the cord threads to its equator, corresponding to an additional cutting angle (β), is equal to 20 ° in this example.

Undervolcanization of the ring with a two-layer reinforcing belt makes it possible to stretch it by changing the angle of inclination of the cord by 5-7 °. In this case, the inclination of the cord strands to the equator, which is 20-25 ° in the under-vulcanized ring, after stretching the ring during its mounting on the tire carcass and their vulcanization in the finished tire, will be within 15-20 °, i.e. within the limits accepted for the broker of radial tires.

The utility model provides the restoration of tires with damaged or destroyed breaker layers during cold repair, provides the possibility of manufacturing new tires in a known modular manner and, due to the presence of solid granules, provides good grip on slippery and wet roads.

Claims (5)

1. The tread ring of a tire for vehicles made of rubber, containing a tread pattern having a wearing part and a wearing part, and an undercut layer, characterized in that it is provided with a reinforcing belt made of 1 ÷ 2 layers of rubberized reinforcing material, the width corresponding to the width of the groove layer, and a rubber layer 1.0-1.5 mm thick duplicated with it, and hard abrasive granules distributed throughout its depth are introduced into the wear part of the tread pattern, while the tread ring o equipped with mini sidewalls. 2. The tread ring according to claim 1, characterized in that the reinforcing belt is made by single-layer spiral winding along the equator with a single rubberized cord thread with a winding pitch of 1.0 ÷ 10.0 mm. 3. The tread ring according to claim 1, characterized in that the reinforcing belt is made two-layer in the form of two canvases of rubberized cord, in each of which the cord threads are located at an angle of 20 ÷ 25 ° to the equator, while the cord threads of one layer are crossed with the cord threads another layer. 4. The tread ring according to claim 1, characterized in that the reinforcing material of the reinforcing belt is made of thin cables twisted from brass steel wire with a thickness of 0.15 ÷ 0.23 mm. 5. The tread ring according to claim 1, characterized in that the reinforcing material of the reinforcing belt is made of synthetic high modulus cord.