Reinforcement pack for pneumatic tires

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.

7 cl, 4 dwg

 

The invention relates to a pneumatic tire with a radial frame reinforcement, intended for use in construction equipment in residential and/or civil construction, such as loaders, trucks, graders, scrapers.

The specified pneumatic tire contains at least mainly of frame amplification of radial steel cord and between this frame reinforcement and a treadmill tread reinforcement in the crown, consisting mainly of the so-called working reinforcement comprising at least two layers of inextensible metal cords parallel to each other in each layer and crossed threads of one layer with another, forming with the circumferential direction angles, which may be in the range 0° to 45°. The use of technology, equipped with pneumatic tires, also requires located radially outside relative to the working layers of the so-called protective amplification, comprising at least one layer of elastic steel cord. Elastic cord is called a cord, which is in tension with a force equal to razryvnaya force, has an elongation of not less than 3%, and the so-called inextensible cord under the action of tension force equal to 10% of its disruptive force, has come otnositelnoi elongation of not more than 0.2%. KORD one or more protective layers formed with a circumferential direction angles, which can be between 5° to 35°and if there are two layers of cords of one layer usually overlap with the other.

To obtain the gain of the crown with good bending characteristics, which would provide greater impact resistance of pneumatic tires and more convenient, French patent FR 1550749 indicates that forming the said strengthening layers of metal cords must meet the following requirements:

- the axial distance between two strands of the cord diameter d in the same layer should be in the range of 1.75 to 2.4 d;

radial distance b between the two cords of the two respective layers should be such in which the ratio a/b is in the range from 0.82 to 1.20.

In order to avoid movements that cause friction when crossing threads or cords weft thread or cord basics woven material, patent US 2151186 specifies whether to use as elements duck rubber or rubber mixture in plastic and tensile state, the elements of the basis, as is known, these elements are designed to strengthen the fabric, and the weft have the sole purpose of maintaining parallelism between the elements of the basis.

In the case of particularly special to the reconstruction gain for aircraft pneumatic tires of French patent FR 2614582 proposes to use as the gain of the crown reinforcement calandrino or layered product, consisting of a certain number placed one on top of another reinforcing layers, each of these layers includes a parallel between a rubber reinforcing members, and the Central axis of the elements of the first layer is shifted by half a step with respect to the Central axes of the elements of the second layer, adjacent to the first. This arrangement enables to obtain the gain of the crown, consisting of amplifying elements of the aromatic polyamide fibers to retain their impact strength and increase service life.

Pneumatic tire of the type in question is exposed from the soil on which it moves, numerous influences, particularly in regard to loading and transport vehicles. Such impacts cutting, clipping and other articles of lead:

a) to cuts in the tread, protective packages and work packages, which can lead to the spread of moisture and soil particles and oxidation of metal elements of these packages;

b) to the through punctures in the crown, including the frame itself enhancement may be punctured depending on the nature and form of the acting subject.

To eliminate the above disadvantages and improvements possible strength gains on the crown of the pneumatic tires of the type in question proposed is carried out according to the invention amplifier package for pneumatic tires, educated reinforcing elements embedded in rubber mixtures for coatings, characterized in that it includes first and second layers parallel between the metal elements embedded in the covering material or mixture, and between these two layers of the third layer elements of textile material embedded in the covering mixture, the said textile elements oriented relative to the metal element at an angle in the range from 70° to 110°.

The textile material can be presented aliphatic polyamide, a polyester, but preferably aromatic polyamide.

The textile element can be a cord of several threads twisted yarns and monofilament.

The metal elements of the first and second layers preferably includes a so-called elastic steel cord. Cord of the first layer may differ from the cords of the second layer, however, the use of metallic cords of the same class for these two layers is preferred when it comes to the cost of production.

For cover material(s) are preferably used rubber mixture (you may also use certain blastomeres, in particular, to cover items of textile material for the third layer). Metal and text, and the performance communications amplifying elements of the three layers of the package according to the invention can be sealed in one rubber compound, but can be also embedded in the rubber compound, different in composition and/or properties, and the first mixture covers the metal elements, and a second mixture of covers of textile items. The metal elements of the first and second layers may also be embedded in two different rubber compounds: the first mix of covers respectively radially upper and lower sides of both the first layer and the second mixture to form respectively the lower and upper sides of these first layers, and the specified second mixture is preferably the mixture, which sealed the textile elements of the third layer.

The characteristics of the present invention will be better understood from the description of the performance methods described in the form of a non-limiting example shown in the attached drawings, which represent:

figure 1 - schematic in the context of amplifying the package in the first embodiment according to the invention,

figure 2 similarly amplification package according to another variant,

figure 3 - meridional cut pneumatic tires for construction equipment, including protective layers according to the invention,

4 very schematically and as an example a set of machines and tools used for the manufacture of such layers.

Figure 1 presents a view slit perpendicular to the direction VI is x amplifying elements E 1and E2pack N according to the invention. These elements E1and E2are metal, steel, elastic fabric: elastic cord is under the influence of thrust equal to its razryvnaya force, is subjected to a relative elongation of at least 3%. The elements of E1embedded in the rubber covering a mixture of M1and together with this mixture to form the top layer of C1package N. the Elements of E2embedded in the rubber mixture M2and together with this mixture to form the bottom layer With2package N. the Elements of E1and E2parallel to each other in each layer and axially separated one from the other at a constant pitch p. the Elements of E1and E2may be different for the two layers of C1and C2: for example, Cordes E1this structure for the layer C1and cord E2other patterns for the layer2but the industrial application is complicated when these elements are identical. This also applies to mixtures of M1and M2. Between two layers of C1and C2is the third layer With3amplification of elements of E3embedded in the rubber covering a mixture of M3. These elements E3textile polyamide monofilament, the direction of which is perpendicular to the direction of metal elements (E1his thread pair is lenny each other in the layer With 3and separated from each other at step P, which can be 1-, 2-, 4x step R. If we denote e1the thickness of the rubber mixture of M1taking place on the radially upper forming elements E1layer C1and e2the thickness of the same mixture of M1taking place under radial bottom forming the same elements, then e2may be equal to or not equal to e1. The production cost is reduced, preferably if both the thickness e1and e2equal. Equally, if we denote e3and e4the thickness of the mixture M3respectively forming the upper and below the lower forming elements E3an intermediate layer With3it is preferable to have e3=e4. On the contrary, e3and e4typically differ from the e1and e2because covering a mixture of M3typically differs from a mixture of M1in composition, though, and is fully compatible with a mixture of M1from the viewpoint of adhesion between the mixtures, whether in volcanoserver.com or devulcanization condition.

Amplifying the pack-N, shown in figure 2, differs from the package in figure 1 mainly by the following parameters:

layers covering a mixture of M1, M2accordingly, under the lower components of the elements of E1the top layer C1and on top of elements E 1the lower layer C2no, due to the fact that the elements of E1are in direct contact with the layer covering a mixture of M3,

- if the metal elements of E1have the same properties and structure of the elements in figure 1, the textile elements of E3in the described and shown in the figure 2 example, represent a textile cord of aromatic polyamide fibers, which composition is more flexible than the monofilament, and due approximately the same diameter and under pressure by two calender rolls for the manufacture of the reinforcement package provides the interpenetration of metal elements (E1with decreasing thickness of the package N and the emergence of corrugated form for the intermediate layer With3.

Figure 3 amplifier package N of three layers C1With2With3formed protective packages 33 or 34 described below pneumatic tyres used in civil construction. The aforementioned pneumatic tire size 18.00-33 HC consists of frame amplification, comprising a single layer of 1 inextensible radial metal, steel cord fixed in each Board usually by wrapping around the side rings 2, for the formation of coils 10 frame amplification, the ends of which are located ogeny approximately at half the height of the sidewalls 5. Between this frame reinforcement 1 and the protector 4 is increased 3 to the crown, including the first of the so-called gain of at least two layers 31 and 32 of inextensible metal cords parallel to each other in each layer, intersecting filaments of the layer 31 with a layer 32 and forming with the circumferential direction angles equal respectively 34° and 20°. Radially inside the specified gain 3 supplemented pattanam" increased 36 of the frame 1, which is represented in the form of the bounding box 36 of the two layers 360 and 361 inextensible metal cords oriented relative to the circumferential direction at an angle 8°, that is, smaller than the smallest angle of the cords of the working layers, while the axial width of said "Metternich" layers 360 and 361 are comparatively less than the axial widths of the working layers 31 and 32.

Radially on the outside reinforcing layer 31, 32 is a protective reinforcement, consisting in the described example of the two protective packages 33 and 34, with each of these packages is an amplifying the pack-N, which includes three layers of C1With2With3. Layers C1and C2identical and consist of an elastic metal cords embedded in a mixture of M1on the basis of natural rubber. Layer With3consists of polyamide monofilament, sdelano is in the same mixture of M 1. The axial width of these two protective packages 33 and 34 such that the axial width of the radially innermost protective package 33 is greater axial width of the radially innermost working layer 31, and the axial width of the radially most outer protective package 34 is greater axial width of the radially outer working layer 32.

The use of such protective package has provided a very significant gain in strength on cuts at all without prejudice in regard to the impact strength and tensile puncture: for the same number of hours running on stony ground, the number of cuts marked in the last protective package 34, was approximately less than 1.5 times, the number of cuts marked in the inner protective layer 33, was less than 4 times, and while in control of a pneumatic tire (conventional protective layers) noted the cuts on the desktop layer 32, the layer 32 being tested pneumatic tyres does not contain a single scratch. It should be added that on the desktop layer 32 control pneumatic tyres there are numerous traces of oxidation, while the corresponding layer testing pneumatic tires completely unaffected.

The set of machines required to manufacture the layer according to the invention, a simple and well-known. With regard to figure 4, the third layer3produce pre-moved is at the same time between the two rollers 104 and 105 of the calender, first, the number of textile items E3wound on the reel 101, and, secondly, two layer or film covering a mixture of M3. With rolls 104 and 105 descends layer With3that immediately cut to the cutting machine 106, in the described example, perpendicular to the direction of calendering, i.e. the direction of elements of E3. The resulting pieces are immediately joined to the connecting machine 107 for forming a layer With3whose elements perpendicular to the direction of calendering on the calender 104, 105, and layer With3wound on a bobbin 110. Specified bobbin 110 releases the tape simultaneously with the metal elements of E1E2(wound on reels 109 and 111) and the layers covering the mixtures M1, M2that go with the rolls 113 and 114, while the calender consists mainly of rolls 115 and 116, which comes amplifier package N, which is then wound on a roll 117.

1. Amplifier package N pneumatic tire formed from a reinforcing element embedded in the covering material, characterized in that it includes the first C1and the second With2layers of metal elements E1E2, parallel to each other and embedded in the covering material M1, M2and between these two layers of C1and C2the third layer With3elements of E3made and the textile material and embedded in the covering material M 3while these textile items E3focus on the elements E1and E2at an angle in the range 70 - 110°.

2. Amplifier package according to claim 1, characterized in that the textile material is presented aromatic polyamide.

3. Amplifier package according to claim 2, characterized in that the textile elements of E3submitted by monofilament.

4. Amplifier package according to claim 1, characterized in that the metallic elements E1and E2are so-called elastic steel cord, identical to the first and second layers of C1and C2.

5. Amplifier package according to claim 4, characterized in that the rubber compound M1, M2, M3have an identical composition.

6. Amplifier package according to claim 4, characterized in that a mixture of M1and M2have identical composition, and a mixture of M3has a different composition.

7. Pneumatic tyre with radial frame reinforcement (1) and radially above the strengthening of the crown (3), comprising at least one so-called protective service (33, 34), characterized in that the specified package (33, 34) is a sound pack-N according to one of claims 1 to 6.



 

Same patents:

FIELD: automotive industry; tire industry.

SUBSTANCE: invention relates to tires for machines used in civil engineering. Proposed tire has radial carcass reinforcement 1 second in each bead by means of ring reinforcement member of bead and radially upper crown reinforcement containing at least two working layers of non-stretchable metal cord with intersecting threads of layers, width of said layers is at least 50% of tread width L, and radially upper two protective layers along crown made of so-called elastic metal cord with intersecting threads of layers. Tread includes, in its grooveless part of thickness D, at least one reinforcement made of strengthening members. Said reinforcement consists of at least two layers of textile monofiber whose threads are parallel in each layer. Axial width of said layers is at least equal to width of most narrow working layer.

EFFECT: increased strength of crow of pneumatic tire.

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EFFECT: increased strength of pneumatic tire crown.

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EFFECT: increased strength of crow of pneumatic tire.

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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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FIELD: tire industry.

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EFFECT: increased service life of tire.

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EFFECT: perfected performances.

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Tire case // 2422291

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to design of truck radial tires. A case contains tread, breaker consisting of metal-cord and textile layers, casing, sidewalls and bead rings. Metal cord diameter is 0.77-0.85 mm. The metal cord itself is made of metal fibers with equal diameter, and the ratio of metal fiber to metal cord diameter is 0.330-0.410. The ratio of metal cord in rubber-covered breaker layer to metal cord is 2.057-2.743, and linear density of metal cord lays within the range of 2.12-2.34 g/m. Herewith, the thickness of each rubber-covered metal cord layer in breaker is 1.25-1.45 mm, and tensile strength of metal cord is not lower than 875±5 N.

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

2 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

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