Tire pneumatic tires of radial construction

 

(57) Abstract:

Usage: in the tire industry. The inventive filament breaker is made of layers of high strength latunirovannaya steel flat profile, superimposed one upon the other in the form of a layered strip, povity wire step 2 - 4 mm 2 Il, 1 table.

The invention relates to pneumatic tires, in particular for the construction of a pneumatic tyre radial build.

Known design tires of radial construction with application in the casing plies of textile materials, and in the layers of the breaker cord [1]

A disadvantage of the known designs is the lack of elastic Flexural rigidity of the steel cord filaments consisting of a bundle of individual metal rods with a diameter of 0.13 0.28 mm and the crown of a tire as a whole, and as a consequence, poor wear resistance, durability and fuel efficiency of tires.

Known tire pneumatic tires of radial construction with steel cord in the carcass and the belt [2, 3] the closest analogue.

The disadvantage of this design tires is its lack of durability and mileage in operation and insufficient fuel from rubber straight steel wire [4]

The disadvantage of this construction tire with a carcass and a tread of rubber-coated steel wire rod is the structure of a wire of circular cross section, which does not allow to change the elastic stiffness properties of the reinforcing material without changing the mass of unit length of yarn or without changing the properties of the metal.

In addition, the enthusiasm of the masses of filaments of round cross-section is accompanied by a decrease of the fatigue properties of the material at multiple strains.

The aim of the invention is the creation of a pneumatic tyre radial construction with increased operational escape, increased fuel efficiency and reduced materiality.

This goal is achieved by the fact that the layers of the breaker tires are made of rubber material made of metal, and the threads of the layers of the breaker is made of high-strength latunirovannaya steel flat profile, superimposed one upon the other in the form of a layered strip, povity wire diameter of 0.15 to 0.20 mm in increments of 2 to 4 mm

Used in the tread of the tires of radial construction of the rubber layers of high-strength latunirovannaya steel flat profile, superimposed one upon the other in the form of a layered strip, povity wire dianazene their fatigue endurance.

Fatigue strength of steel strip of rectangular cross-section depends on its thickness.

It was established experimentally that close to the optimal thickness of 0.3 to 0.5 mm, which allows you to keep the fatigue strength at a high level and significantly superior in Flexural rigidity Ravnopravie filaments of the steel cord.

When replacing the filaments of the steel cord of the increased diameter and strength, for example, the brand L/15 with a diameter of 1.62 mm and the strength of 260 kg, a flat reinforcing material in the form of a multilayer strip, and to eliminate bias of individual bands relative to each other their Poviat wire.

It should be noted that the use of two-layer or multi-layer strip povity wire allows you to save the fatigue strength at the level of individual strips, for example, a thickness of 0.4 mm, and the Flexural rigidity at the level of the sum of the thicknesses of the strips.

The proposed solution avoids Hobbies rating of the breaker tires of radial construction when replacing the cord on a flat material.

The invention is illustrated by drawings, where Fig. 1 presents a cross section of a pneumatic tyre radial construction; and figuig. 1 shows an enlarged portion of a layer of the breaker filaments which are made of high-strength latunirovannaya steel flat profile, superimposed one upon the other in the form of a layered strip, povity wire; an enlarged fragment of the structure of the steel cord in the layers frame (1 and 2 proposed option); an enlarged fragment of the structure of the steel cord in the layers of the breaker; an enlarged fragment of the structure of the steel cord in the layers frame (3 and 4 nearest equivalent).

In Fig. 2 layers of high-strength latunirovannaya steel flat profile, superimposed one upon the other, in the form of a layered strip; wire avivausa puff strip.

The results of bench, laboratory of road and operational testing (table) show that when used in the layers of the breaker reinforcing material in the form of a rubber thread layer of high-strength latunirovannaya steel flat profile, superimposed one upon the other and povity wire from step 2 to 4 mm, the total endurance on the machines is increased by 10% fuel efficiency by 6% and mileage of the tire in operation for 12%

Examples of specific performance, including the results of testing the proposed design of the tire in comparison with the closest analogue in the table.

Estonian Centuries Volnov A. A. Technology of tire production M. "Chemistry", 1981, S. 28-30.

3. Saltykov A. C. fundamentals of modern technology tires, M. "Chemistry", 1974, S. 114-115.

4. Prospects of application of a straight steel wire as tire cord. 1979, No. 10, 36 Express information, tire industry N 8, Tsniiteneftehim, M. 1979, S. 37-38.

Tire pneumatic tires of radial construction, containing the skeleton of rubber-steel cord or rubberized textile cord and breaker of the rubber material of metal, characterized in that the threads of the breaker is made of layers of high strength latunirovannaya steel flat profile, superimposed one upon the other in the form of a layered strip, povity wire from step 2 4 mm.

 

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The invention relates to pneumatic tires, in particular for the construction of the breaker tires of radial construction

FIELD: automatic industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 1.14 to 1.26 mm. Metal cord proper is made of equal-diameter metal threads, ratio of metal thread diameter to diameter of metal cord being from 0.253 to 0.298. Ratio of breaker metal cord pitch to diameter of metal cord is from 1.9 to 2.25, and linear density of metal cord lies within 5.0 and 5.5 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 0.35 to 1.49, breaking strength of metal cord being not lower than 1715±5N.

EFFECT: reduced materials usage, labour input and energy consumption at production of tyres.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 0.87 to 0.97mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.242 to 0.293. Ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.85 to 2.076, and linear density of metal cord lies within 2.84 and 3.16 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.62 to 1.85, and breaking strength of metal cord is not lower than 955±5N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyres.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker consisting of metal cord and textile layers, carcass, side strips and bead rings. Diameter of metal cord is from 0.83 to 0.91 mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.280 to 0.331. ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.978 to 2.168, and linear density of metal cord lies within 2.64 and 2/96 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.538 to 1.839, and breaking strength of metal cord is not lower than 855±5N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyre.

2 dwg

FIELD: automotive industry.

SUBSTANCE: proposed pneumatic tire has crown, two side strips and two beads as well as carcass reinforcement secured in each bead and crown reinforcement provided with working unit and protective unit form inside to outside in radial direction. Protective unit contains at least one layer of parallel reinforcement circumferentially orientated elements. Layer of protective unit is formed by reinforcement elements made of aromatic polyamide with initial modulus of elasticity not less than 1000 cN/tex and breaking strength exceeding 65 cN/tex.

EFFECT: increased strength of pneumatic tire crown.

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EFFECT: increased strength of crow of pneumatic tire.

4 cl, 1 dwg

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EFFECT: increased strength of tires.

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SUBSTANCE: invention relates to tire with radial reinforcement of carcass for use on heavy vehicles, such as transport or construction and road-building machines. It relates to tire with axial width exceeding 37 inches. According to invention, tire has working reinforcement crown consisting of at least two uninterrupted working layers and terminating from each side of circumferential (equatorial) middle plane in at least two half-layers whose metal reinforcement members form angles exceeding minimum angle which is formed by reinforcement members of uninterrupted layers relative to circumferential direction. Half-layer passing in axial direction outwards further than other half-layers is in contact with widest in axial direction uninterrupted layer in crown, and two half-layers cover in radial direction axially outer end of said working layer widest in axial direction.

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EFFECT: perfected performances.

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EFFECT: material, labor and energy consumption of tire manufacturing is lowered.

2 dwg

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EFFECT: longer life.

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