Pneumatic radial tire

 

(57) Abstract:

Usage: in the tyre industry for vehicles. Essence: the threads of the steel cord breaker located under equal angles at least 70oto the meridional direction and in the adjacent layers intersect. The threads of the first and third layers have a tensile strength of 1.8-2.2 times smaller than the threads of the second layer. table 1. 2 Il.

The invention relates to the tire industry and can be used in the manufacture of radial tires. The most common design of the pneumatic radial tire includes a tread, sidewall, bead frame, consisting of one or more ply, three-layer steel cord breaker, in which the threads of two steel cord layers are placed at an angle of at least 70oand yarns of the third layer at an angle of 20-25oto the meridional direction (technical documentation Nispa N 28-D). This design is used in the tire 8,25R20, 9,00R20, etc.

In this arrangement, the filaments of the steel cord breaker, located at an angle of at least 70oare the bearing and take the load of the internal pressure and roads. Yarns of the third layer (shielding) almost load the number of the pressure distribution in the contact area.

2. Increased shear stress on the edges of the filaments of the steel cord bearing layers of the breaker.

These shortcomings contribute to the increased wearability tread in operation and rolling losses.

Closest to the technical nature of the invention is the design radial pneumatic tires containing the tread, sidewall, bead frame, consisting of one or more ply, three-layer steel cord breaker, the threads of which the layers are under equal angles at least 70oto the meridional direction; in this case the threads of the steel cord in two adjacent layers are parallel and have a breaking load, 1.8-2.2 times smaller than the filament of the steel cord of the third layer, the direction of the fibers which cross direction yarns of the other two layers.

The disadvantages of this pneumatic radial tires are

1. The technological complexity of manufacturing of the breaker and use it when building the tire.

2. Not a high level of stability performance of the tire.

The technological complexity of manufacturing of the breaker due to twisting brokerage bracelet after reading it with bisoke level of stability performance tires due to uneven distribution of effort shift in the layers of the breaker, which is caused by the design of the breaker prototype. Given that in the outer layer of the breaker is used more durable and more high modulus cord, shear forces that occur in this layer will be greater than in the adjacent layer, is proportional to the module or the breaking strength of the cord used.

The purpose of the invention to improve manufacturability radial tires, ensuring the stability of their performance. This objective is achieved in that the pneumatic radial tire containing the tread, sidewall, bead frame, consisting of one or more ply, three-layer steel cord breaker, the threads of which the layers are under equal angles at least 70oto the meridional direction and in the adjacent layers intersect; in this case the threads of the first and third layers have a tensile strength of 1.8-2.2 times smaller than the threads of the second layer.

When placing a stronger steel cord between 1 and 3 layers, with the strength of the filaments of the steel cord, 1.8-2.2 times less is more even force distribution shift between the layers of the breaker, which contributes to greater stability performance of the tire.

In Fig. 1 shows a pneumatic tire, the cross-section of Fig. 2 is a longitudinal section of the breaker.

The tire includes a carcass 1, side 2, side 3, the protector 4, Brecker 5.

Breaker 5 is made of three layers of rubber-coated steel cord 6, 7 and 8. The filament of the steel cord are under equal angles at least 70oto the meridional direction and in the adjacent layers intersect, when this thread first and third layers have a tensile strength of 1.8-2.2 times smaller than the threads of the second layer. Using the proposed design of the bus allows you to provide greater uniformity of the stress-deformed state between the layers of the breaker and to improve the manufacturability of the breaker, to improve the stability performance of the tire.

The table shows the comparative results of machining tests of the tire 8,25R20 prototype and manufactured in accordance with the invention.

As can be seen from the data bus according to the invention are more stable quality and a higher level of need when machining trials.

Pneumatic radiancy steel cord breaker, the thread in which the layers are under equal angles at least 70oto the meridional direction, characterized in that, with the aim of improving the manufacturability of the breaker, ensure more stable performance tires, the threads of the first and third layers of the breaker have a tensile strength of 1.8 to 2.2 times smaller than the threads of the second layer, the filaments in adjacent layers intersect.

 

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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.

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.

20 cl, 5 dwg

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.

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.

7 cl, 4 dwg

FIELD: tire industry.

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.

EFFECT: increased service life of tire.

8 cl, 4 dwg

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.

21 cl, 11 dwg

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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