Pneumatic tyre for vehicle

FIELD: transport.

SUBSTANCE: invention relates to vehicle pneumatic tire. Vehicle pneumatic tire has cushion and reinforcing element layer embedded into at least one rubber mixture. The cushion is made of material selected in group consisting of steel, aramid, carbon fibre, natural fibre, magnesium and magnesium compounds. The reinforcing element layer is single or multilayer layer at an angle 0° to 5° to circumferential direction and is made of at least one polyester thread and/or polyester cord.

EFFECT: perfected design.

12 cl, 1 tbl

 

The invention relates to a pneumatic tire of a vehicle having a breaker layer and a reinforcing element embedded in at least one rubber compound.

In an industry well known reinforcing elements to enhance various elastomeric products. So, for the pneumatic tires of vehicles known use of the bandage of the breaker, which has a single or multilayer structure covers the edges of the breaker and contains reinforcing elements, which are arranged in parallel and, mainly, on the perimeter, in the form of cords enclosed in rubber. This bondage breaker is used, in particular, when used at high speeds, to prevent increase of the tire due to centrifugal forces occurring during operation.

In the manufacture of tyres bandage is applied in the form of layers, tapes, or separate cords with the reinforcing elements, enclosed in devulcanizing rubber compound wound or wound on the breaker. The reinforcing elements are enclosed in rubber by means of a sheet mainly parallel filamentary reinforcing elements, which are usually pre-treated thermally and/or by impregnation to better connect with the coating rubber manner known to the person skilled in the art, passing longitudinally through the calender or press extras is der to cover the rubber mixture. In the process of shaping on existing devices and vulcanization of the tire, the tire is usually expands due to the increase in the shoulder area by up to 2% and in the Central zone by up to 4% compared with devulcanizing collected by the bus when devulcanization assembled tire is mounted on a flat drum. When using more modern drums for vulcanization of tires increase tire during its production still must not exceed 2%. When using more modern devices, the increase is not so high. Another problem is the shrinkage of concrete materials Korda at elevated temperatures. Lower shrinkage provides a higher resistance to deformation of the tire of the vehicle and, thus, better known to the specialist, the contact patch (= flattening under load).

Cords band will contribute to a significant increase in the process of shaping and vulcanization in order to give the tyre the correct form, and they will provide after the making of the tire to its high practicality at high speeds, i.e. good resistance to deformation during operation. To meet these requirements, cords should be stretched with a moderate effort to stretch 3-4% and require a much more powerful force to take great is th value.

Conveyor belts are endless belts, the essential feature of which is the use of a reinforcing element, which usually consists of woven layers created from identical and/or different materials Korda. Fabric is subjected to strong mechanical stress in the process of production of conveyor belts. Fabric rubbed or soaked with glue for better adhesion to the layer of the coating, and then covered on both sides by means of a calender, repeatedly folded in half and, finally, applied with a calender on the top layer. Conveyor belts usually have to withstand heavy loads because of the high rate of carriage, so there is usually the need for constant use of the reinforcing element.

The flat belt has a tensile element, formed by a layer of a reinforcing element consisting of woven cord threads. Cord thread, enclosed in a rubber matrix, protected by one or two layers of rubberized protective fabric. Cord is used to allow the flat belt to transfer large efforts at small strains. This also applies to flexible woven hoses that are subjected to strong internal and external pressures, and therefore reinforced with a suitable layer of a reinforcing element consisting of a woven cord is a cord yarns. When you enable flexible cord woven hoses, it is important to apply cord thread at right angles in order to prevent elongation and thinning or extension and shortening.

Pneumatic supports, created from one or more of the rubber matrix, also need to be strengthened with a layer of a reinforcing element consisting of cords, for the partial absorption of loads caused by compression, tension or shear. The layer of reinforcing element created from cords must also provide a high transfer of force at very small strains.

As prior art should be considered the following documents:

(D1) US 7252129 B2

(D2) EP 1703005 B1

(D3) GB 2139574 A

(D4) GB 2172251 A

(D5) US 6016858 A1

(D6) US 6082423 A1

(D7) EP 0715971 A2

D1 describes a hybrid cord composed of aramid fibers and additional fibers selected from the group consisting of polyester, nylon and viscose. This hybrid cord provides a lower separation of the individual filaments of the layer of reinforcing element.

D2 describes coated by dipping hybrid cord composed of viscose filament and locallevel thread and is known for good fatigue resistance.

Description tire vehicles, having a cord reinforcing element having a low number of turns from 40 to 100 K/m, it is known from D3. It is believed that this improves the fight is their rolling speed of the tyre.

D4 describes a tire for vehicles having a cord reinforcing element consisting of strands of monofilament, where the monofilament has a fineness of not less than 250 decitex and where the monofilament is not twisted.

D5 and D6 describe lightweight tires with optimized rolling resistance, with the "top layer" of the cords selected from the group consisting of aramid, rayon, polyethylenterephthalat, polyethylene terephthalate and polyvinyl acetate. Breakers of the respective tires are made of fiberglass (D5) or rayon (D6).

D7 describes a pneumatic tire for vehicles having a so-called layer of the breaker with an angle of 0°, consisting of fibers of polyethylene terephthalate or nylon. In this case, the torsion does not exceed 300 K/m

Thus, the present invention is the creation of a pneumatic tire of a vehicle, which has a layer of a reinforcing element, which consists of strands and/or cords and which has a lower shrinkage and a higher resistance to deformation.

The present invention is solved due to the fact that a pneumatic tyre of a vehicle having a breaker layer and a reinforcing element embedded in at least one rubber compound, characterized in that the breaker is made from a material selected from the group consisting of steel, aramid, carbon fibers, natural what's fibers, magnesium and magnesium compounds, and the fact that the layer of reinforcing element is single-layered or multi-layered layer at an angle from 0° to 5° to the district direction and consists of at least one polyester yarn and/or polyester cord.

It was unexpectedly found that such a layer of reinforcing element has a much-improved shrinkage and much better resistance to deformation in the pneumatic tire of the vehicle in which the material of the breaker is selected from the group consisting of steel, aramid, carbon fibers, natural fibers, magnesium and magnesium compounds.

Use, as known to the person skilled in the art, polyamide yarns and cords in the reinforcing layer element is characterized by a low modulus of longitudinal elasticity and demonstrates the shortcomings of strong thermal compression at high temperatures in the finished tire. However, when the aramid strands and/or cords are used in the manufacture of tyres, the thus created layers of the reinforcing element are disadvantageous in that their ability to expand too low, so devulcanization bus unsatisfactory is formed and the result is getting low homogeneity of the bus.

Specified in the present invention a pneumatic tire of a vehicle having a layer of a reinforcing element of the polyester neither is it and/or polyester cord on the contrary, does not have the above disadvantages. Moreover, the use of a layer of a reinforcing element of the polyester fibers and/or polyester cord is significantly less expensive than typically the previously used aramid yarns or cords and/or hybrid cords.

In addition, a layer of a reinforcing element may be made of single or multilayer, preferably single, at an angle from 0° to 5° to the district direction. "Done" in this context means that the layer of reinforcing element is wound in the direction along the perimeter in the form of a single layer or multiple layers, preferably one layer.

Brecker specified in the present invention a pneumatic tire of a vehicle consists of a material selected from the group consisting of steel, aramid, carbon fibers, natural fibers, magnesium and magnesium compounds, while steel is preferred.

Preferably it turned out, if polyester thread and/or polyester cord is polyester thread HMLS and/or polyester cord HMLS (HMLS with high modulus and low shrinkage) or polyester thread HMHS and/or polyester cord HMHS (HMHS - with high modulus and high shrinkage).

Preference is given to using polyester HMLS yarn and/or polyester cord HMLS, and impregnated with polyester thread and/or p is opetany polyester cord HMLS for use in the tire must have according to ASTM D 855, shrinkage 2% ±1,0% at 180°C.

Pneumatic tires of vehicles and rubber products are often used not clean the thread and cord. Cord, unlike threads, consists of at least two yarns twisted together.

Polyester polyester yarn and/or polyester cord predominantly selected from the group consisting of polyethylene terephthalate (PET), and/or polyethylenterephtalate (PAN), and/or polybutylene terephthalate (PBT), and/or polycarbonate (PC).

To ensure reliable bonding of textile reinforcing elements to rubber, it is desirable to provide polyester thread and/or polyester fabric impregnated with adhesive, for example a single or double dipping in latex, containing resorcin-formaldehyde resin.

Also preferably, polyester cord had a fineness of from 2000 to 5000 dtex, preferably from 3000 to 4000 dtex, and/or polyester fiber had a fineness of 1,000 to 1670 dtex, preferably from 1100 to 1440 dtex. The person skilled in the art it is known that the characteristics of cords tied to their overall score decitex.

Preferably, polyester thread, preferably in the form of impregnated cords, i.e. pre-impregnated with adhesive, was curled at the ends with the number of torsion from 250 to 500 C/m, preferably from 370 to 430 K/m, and had an elongation, according to ASM D 855, when the force of 45 N from 2.0 to 5.5%, preferably from 2.7 to 5.0%, and more preferably in the range from 3.2 to 4.5%.

It was found that these characteristics of the material provide good results with respect to shrinkage and resistance to deformation.

When the above layer of the reinforcing element, the prisoner at least one rubber compound, used in the pneumatic tire of the vehicle, preferably in the form of a bandage of the breaker and/or the amplifier Board, the bus will be particularly good performance when used at high speeds, and subsidence will be reduced significantly. For this purpose, the density of threads in a rope, in a particular embodiment, ranges from 80 to 125 threads per decimeter, preferably from 90 to 110 threads per decimeter.

When the above-described reinforcing layer element is used as the amplifier Board in the pneumatic tire of the vehicle, the advantage is that this reinforcing element has a higher modulus than the previously used layers of polyamide reinforcing element, and also has the advantage in cost.

These advantages are also obtained when the above layer of the reinforcing element in the production of other elastomeric products, such as conveyor belts, flat belts, flexible woven hoses and pneuma is practical support.

The embodiments and further advantages of the present invention are explained in more detail with the help of table 1, below.

Table 1
Nylon cord (PA6,6)
940×2 decitex
80 threads per decimeter one layer
Nylon cord (PA6,6)
940×2 decitex
80 threads per decimeter two coats
Polyester fabric (PET)
1440×2 decitex
105 threads per decimeter one layer
Polyester fabric (PET)
1440×2 decitex
105 threads per decimeter two coats
Strength tensile 1%, according to ASTM D 85535 N/cm70 N/cm90 N/cm180 N/cm
Strength tensile 3%, according to ASTM D 85570 N/cm140 N/cm200 N/cm400 N/cm
Shrinkage at 180°C (%), ASTM D 8555,05,02,02,0
Residual shrinkage (%) 3,03,01,81,8

Claimed power precisely defined through dependence on strain. Shrinkage determined in dependence on the reaction force. The stated values are laboratory data during the initial load of 0.5 CN/Tex, i.e. 940×2 corresponds to the initial load in 94 SN and 1440×2 - initial load 144 CH. Higher module from polyester cord means that the number of layers of the reinforcing element can be reduced by approximately 50%, which also reduces the amount of rubber compound, which concluded layer of the reinforcing element. The result is the best rolling resistance of pneumatic tires of a vehicle and, as a consequence, the reduction of fuel consumption.

Significantly improved shrinkage provides the best resistance to deformation of the pneumatic tires of a vehicle.

1. A pneumatic tire of a vehicle having a breaker layer and a reinforcing element embedded in at least one rubber compound, characterized in that the breaker is made from a material selected from the group consisting of steel, aramid, carbon fibers, natural fibers, magnesium and magnesium compounds, and a layer of reinforcing element is a single layer or many of the ply layer at an angle from 0° to 5° to the district direction, when this layer of the reinforcing element consists of at least one polyester yarn and/or polyester fabric, with polyester polyester yarn and/or polyester cord selected from the group consisting of polyethylene terephthalate (PET), and/or polybutylene terephthalate (PBT), and/or polycarbonate (PC)and polyester filament has a fineness of from 1,100 to 1440 dtex.

2. A pneumatic tyre of a vehicle according to claim 1, characterized in that the breaker is composed of steel.

3. A pneumatic tyre of a vehicle according to claim 1 or 2, characterized in that the layer of reinforcing element is a single layer.

4. A pneumatic tyre of a vehicle according to claim 1, characterized in that the polyester fabric has a fineness of from 2000 to 5000 dtex.

5. A pneumatic tyre of a vehicle according to claim 1, characterized in that the polyester filament and/or polyester cord curled at the ends with the number of turns from 250 to 500 K/m

6. A pneumatic tyre of a vehicle according to claim 5, characterized in that the polyester filament and/or polyester cord curled at the ends with the number of turns from 300 to 430 K/m

7. A pneumatic tyre of a vehicle according to claim 1, characterized in that the polyester filament and/or polyester cord have an elongation according to ASTM D 855 at 45 H from 2.0 to 5.5%.

8. A pneumatic tyre of a vehicle according to claim 7, characterized in that pole the characteristic thread and/or polyester cord have an elongation according to ASTM D 855 at 45 H from 2.7 to 5.0%.

9. A pneumatic tyre of a vehicle according to claim 1, characterized in that the polyester filament and/or polyester cord have an elongation according to ASTM D 855 at 45 H from 3.2 to 4.5%.

10. A pneumatic tyre of a vehicle according to claim 1, characterized in that the layer of reinforcing element embedded in at least one rubber compound, is a supporter of the breaker.

11. A pneumatic tyre of a vehicle of claim 10, characterized in that the density of threads in the bondage breaker ranges from 80 to 125 threads per decimeter.

12. A pneumatic tyre of a vehicle according to claim 11, characterized in that the density of threads in the bondage breaker ranges from 90 to 110 threads per decimeter.



 

Same patents:

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FIELD: transport.

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EFFECT: higher strength and reliability.

25 cl, 5 dwg

FIELD: transport.

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EFFECT: perfected performances.

21 cl, 11 dwg

Pneumatic tire // 2405682

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly to heavy-duty radial pneumatic tires of relatively small size ratios. Tire comprises toroidal carcass arranged atop two tire beads, undertread band arranged on outer side along carcass radial direction, and tread arranged on outer along radial direction of undertread belt. Undertread belt comprises at least one circular layer arranged on outer side along radial direction of carcass rim part and made up of multiple rubberised cords running along the tire equatorial axis, and at least two inclined layers of undertread belt arranged on circular layer of undertread belt, each being formed by multiple rubberised cords running inclined to tire equatorial axis O. Width of undertread belt circular layers makes at least 60% of the tire total width. Width of at least one inclined layer of undertread belt exceeds that of circular layer. Note that elasticity modulus of the first cords arranged on outer side of undertread belt circular layer is smaller than that of second cords arranged on inner side, across direction of the first cords.

EFFECT: longer life.

10 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Proposed tire features ellipticity factor equal to or under 50%. Breaker layers 9, apart from outer breaker layer 10, are arranged so that breaker layer cords are arranged at θ 10-70° relative to tire lengthwise direction. Said outer breaker layer 10 is made of coiled layer 12 of coiled tape provided with steel cords in tire lengthwise direction. Said breaker layer 10 comprises section 10A located between fold position Po on opposite sides from tire equator and fold position 10B bent in U-like manner from position Po toward tire equator. Section 10A features width varying from 70% to 80% of width of contact between tread and ground while fold section 10 B has width varying from 5.0 mm to 0.5 of width.

EFFECT: longer life.

9 cl, 8 dwg

Pneumatic tire // 2456168

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Tire carcass ply is laid between two double beads. Breaker ply is recessed on carcass ply outer peripheral side in tread section. Tread is provided with multiple main grooves extending along tire circle. Maximum depth of each main groove varies from 8.5 mm to 15.0 mm. Relationship between height of actual tire profile SH and that of profile SHstd calculated from tire size is set to 0.97≤α≤0.99. Relationship between contact areas makes 65-70% under conditions of measurements whereat air pressure makes 200 kPa and load making 50% of bearing capacity at said air pressure. Mean contact pressure P varies from 300 kPa to 400 kPa.

EFFECT: longer life, efficient braking on moistened surface.

13 cl, 4 dwg, 1 tbl

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