Pneumatic tyre

 

(57) Abstract:

Pneumatic tyre refers to the tire industry and can be used in the manufacture of pneumatic tyres diagonal structure for wheels of vehicles, mostly trucks, buses, trailers, agricultural machinery. A pneumatic tire comprises a tread, a carcass of two or more layers of polyamide or analnogo cords, filaments which are located on the equator at an angle 40-65oto the meridional direction, bead rings, protector, consisting of side walls and a treadmill. The treadmill tread is made of two rubber top layer and bottom. The top layer of the tread is made of rubber having an elongation when breaking 450-600%, nominal voltage when the elongation of 300 % of 7 - to 12 MPa. The bottom layer of the tread is made from a soft and elastic rubber having an elongation at break of 600-800%, nominal voltage when the elongation of 300% of 3 to 6 MPa. As a result, bus improves performance, increases elasticity. 1 C.p. f-crystals, 1 Il., table 1.

Usage: the invention can be used in the manufacture is of Abila, buses, trailers.

Known patents, providing the structure of the tread of the rubbers with different properties. Typically, rubber bottom layer is more rigid than the rubber top layer, or with different dynamic characteristics.

Consider the design of the pneumatic Morosini described in the patent of Germany N 3637.825 from 06.11.86 firm Bridgestone Corporation, Japan. This bus has a layered structure of the tread.

The upper cover rubber layer has a dynamic modulus E1in the area of from 50 to 120 kgf/cm2and the ratio of the tangent of the loss to the dynamic modulus (tan /E1in the range from 3.0 to 10-3to 6.0 10-3and the bottom rubber layer has a dynamic modulus E1in the range from 30 to 50 kgf/cm2and the ratio of the tangent of the loss to the dynamic modulus (tan/E1) is not more than 5.0 10-3. Module rubber bottom layer treadmill defined in the static at 100% elongation is not less than 25 kgf/cm2and not more than 5 kgf/cm2above module rubber covering layer (top).

The specified structure of the tread of rubber with different dynamic characteristics provide the traveler is achieved by selecting the optimum dynamic characteristics of rubber top and bottom layers of the tread (E1and tan /E1).

Given that a specific correlation between the above dynamic characteristics of the tread rubber and its static characteristics voltages and relative elongation does not exist, a comparison of dynamic characteristics of the tread rubbers of this patent and static characteristics according to the alleged invention is not possible.

Using the tread rubber with different dynamic characteristics can reduce vibration of the front wheel of the motorcycle when driving on rough roads at high speed, but does not solve the problem posed by the authors of the proposed invention to improve the resistance to the emergence and growth of cracks during operation of the tire. Therefore, as the prototype is useful to consider the design of diagonal tire according to the "Technical documentation No. 29-D on industrial production of truck tyres with quality 1990 diagonal Tyres", developed by the Institute of tire industry, Moscow, 1986.

These tires have Brecker, frame, consisting of 2 or more layers of polyamide or analnogo cords, filaments which are located on Equatorial track, made of one of rubber, having an elongation at break of at least 450% and conditional stress at elongation 300% not less than 70 kgf/cm2in static tests.

In serial production for the manufacture of diagonal truck tire use tread of one of the rubber with the following parameters determined in static tests: elongation at break 450 - 600%, nominal voltage when the elongation of 300% 7-12 MPa. The disadvantage of these tyres is that the hard rubber tread with significant deformations of the tires, raskalyvaemost polyamide or analnogo cords of the carcass, especially in the absence of the cooling process of the tire under pressure after vulcanization, often do not provide the necessary resistance of the rubber to crack and resistance to their expansion during operation of the tire, causing the tire in operation prematurely fail.

The purpose of the proposed invention is to improve performance, increase elasticity and resistance the emergence and growth of cracks in podkrasochnoy layer of the tire tread diagonal design, produced using the frame abusow, the trailers. A positive effect is achieved by the combination of known and new features.

Famous are the pneumatic tire containing Brecker, frame, consisting of 2 or more layers of polyamide or analnogo cords, filaments which are located on the equator at an angle of 40 - 65oto the meridional direction, side ring, protector, consisting of side walls and a treadmill made of one of rubber, having an elongation at break 450-600%, nominal voltage when the elongation of 300% 7-12 MPa.

New in the alleged invention is that the bottom layer of the tread is made of low-modulus elastic rubber having the following physical and mechanical properties: elongation at break - 600-800%, nominal voltage when the elongation of 300% - 3-6 MPa.

In the finished tire, the lower layer of the treadmill can have a variable thickness along the profile, with the upper boundary of this layer should not exceed the level of 1/3 of the height of the elements of the tread.

It is considered that in truck tires dominant for podanego layer and of the tread is the mode of the specified voltage. However, this can prinimayushee high modulus tensile yarns. These tires have almost no raskalyvaemost, that is, the change in dimensions under the action of internal pressure during storage and maintenance of buses. For truck tyres diagonal designs, manufactured using polyamide or anenih cords in the carcass, mode podanego layer of the tread close to the mode of the set of deformation, since the module strain data cord 2-3 times lower than that of viscose cord. These tires have an increased tendency to raskalyvaemost. In this mode the heat generated does not depend on the module stretching rubber.

Therefore, the use of highly elastic rubber with a lower module stretching for the lower layer treadmill (compared to the top layer) will allow, without altering thermal regime in the tire, to reduce stresses on the boundary of the breaker - tread, to increase the resistance the emergence and growth of cracks.

The drawing shows a meridional section of the tire. A pneumatic tire comprises a tread 1, the frame 2 of the two or more layers of polyamide or analnogo cords, filaments which are located on the equator at an angle of 40 - 65oto the meridional direction, bead rings 3, protectora 6 and the lower layer 7.

The top layer of the tread is made of rubber, provided technical documentation for the manufacture of truck tyres diagonal design with the elongation at break 450-600%, nominal voltage when the elongation of 300% 7-12 MPa. The bottom layer of the treadmill is made from a soft and elastic rubber having an elongation at break of 600-800%, nominal voltage when the elongation of 300% - 3-6 MPa.

As can be seen from the data (table 1), in the manufacture of tires, in accordance with the claimed invention (experimental) the need tires 1025420-457 TO-83A on the machines managed to raise almost 2-3 times, on tires 12,00-20 VI-A the need tires remained at the same level.

1. Pneumatic tire containing Brecker, frame, consisting of 2 or more layers of polyamide or analnogo cords, filaments which are located on the equator at an angle of 40 - 65oto the meridional direction, side ring, protector, consisting of side walls and a treadmill made of one of rubber, having an elongation at break of 450 to 600%, nominal voltage when the elongation of 300% of 7 - to 12 MPa, characterized in that the treadmill tread made the ESD stress at elongation 300% 7 - 12 MPa, and the bottom layer is made of low-modulus elastic rubber having the following physical and mechanical properties: elongation at break 600 - 800%, nominal voltage when the elongation of 300% of 3 to 6 MPa.

2. Pneumatic tyre under item 1, characterized in that the lower layer of rubber treadmill projector can have a variable thickness profile tyres, while the upper boundary of this layer shall not exceed 1/3 of the height of the elements of the tread.

 

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Pneumatic tyre // 2025287
The invention relates to the tire industry, in particular, to the design of the breaker truck radial tires

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.

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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.

20 cl, 5 dwg

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EFFECT: increased strength of crow of pneumatic tire.

4 cl, 1 dwg

FIELD: tire industry.

SUBSTANCE: invention relates to design of automobile tires, particularly to those used in construction vehicles. proposed reinforcement pack N of pneumatic tire contains reinforcement member embedded in converting materials and it includes first layer C1 and second layer C2 of metal elements E1, E2 parallel to each other and embedded into covering materials M1, M2 and third layer C3 of elements E3 made of textile material is placed between two layers C1 and C2, third layer being embedded into covering material M3. Textile elements E3 are orientated relative to elements E1 and E2 at angle within 70° and 110°.

EFFECT: increased strength of tires.

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EFFECT: increased service life of tire.

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FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Air tire has breaker structure that comprises first breaker layer (51), second breaker layer (52) arranged in radial-inner position relative to first breaker layer (51), third breaker layer (53) arranged in radial inner position relative to first (51) and second (52) breaker layers. Every breaker layer (51, 52, 53) comprises multiple elongated reinforcing elements arranged above 1st, 2nd and 3rd breaker angles. Note here that 1st and 2nd angles vary from 15 to 40 degrees. Second angle has opposite sign relative to 1st breaker angle. Third breaker angle features magnitude varying from 40 to 90 degrees and opposite sign with respect to second angle. Breaker structure comprises also breaker layer (54) arranged at zero degree angle relative to 1st breaker layer (51) comprising elongated reinforcing elements arranged to make, in fact, zero breaker angle,.

EFFECT: perfected performances.

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Tire case // 2422291

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

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EFFECT: longer life.

9 cl, 8 dwg

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