Pneumatic radial tire

 

(57) Abstract:

The inventive filament of the steel cord breaker located under equal angles not less than 70° to the longitudinal direction. The filament of the steel cord in two adjacent layers 6 and 7 are parallel and have a tensile strength of 1.8 - 2.2 times smaller than the filament of the steel cord layer 8. The direction of the fibers of layer 8 intersects with the direction of the fibers of the layers 6 and 7. 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 arranged at an angle of at least 70aboutto the meridional direction and the yarns of the third layer at an angle of 20-25about(technical documentation Nispa N 28-D). This design is used in the tire 8,25R20, 9,00R20, etc. In this arrangement, the threads of the steel cord breaker, located at an angle of not less than 70aboutare the bearing and take the load of the internal pressure and roads. Yarns of the third layer (shielding the s bus above structure have the following disadvantages:

1. Uneven pressure in the contact area.

2. Increased shear stresses at the edges of the thread-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 proposed pneumatic radial tire is the design radial pneumatic tires containing frame, bead, sidewall, tread and three-layer belt from one type of steel, in which the angles of the filaments of the steel cord are the same and are at least 70aboutto the meridional direction. In this case, the breaker is made of alternating layers of steel cord and rubber layers of different thickness. From the outside is a thick rubber layer and the inner side of thin.

The disadvantages of this pneumatic radial tire is the increased complexity of manufacturing, increased shear stresses in the layers of the breaker due to the non-symmetry of the stress distribution of the breaker reduces performance tires.

Therefore, the design of the tyre has not found wide use in the tire industry.

istihaada fact, 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 70aboutto the meridional direction, and the thread of steel cord breaker in the two adjacent layers are parallel and have a tensile strength of 1.8-2.2 times smaller than the filament of the steel cord of the third layer, the direction of the fibers which intersects with the direction of the fibers of the other two layers.

These features of the invention determine the novelty of the proposal. These differences are significant because they provide the achieved technical result.

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

The tire includes a carcass 1, side 2, side 3, the protector 4 and the breaker 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 70aboutto the meridional direction. In this case, the threads of the steel cord in two adjacent layers 6 and 7 are parallel and have a tensile strength of 1,the group of yarns of layers 6 and 7.

The use of two layers of steel cord less 1.8-2.2 times the breaking strength than in the third layer, allows to obtain a uniform unit pressure in the contact area of the tyre surface.

PNEUMATIC RADIAL TIRE comprising a tread, sidewalls Board, the frame comprising at least one cord layer, three-layer steel cord breaker, the threads of which the layers are under equal angles at least 70oto the meridional direction, characterized in that the filaments of the steel cord in two adjacent layers are parallel and have a tensile strength of 1.8 to 2.2 times smaller than the filament of the steel cord of the third layer, the direction of the fibers of which it is crossed with the direction of the fibers of the other two layers.

 

Same patents:

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

Pneumatic tyre // 2021906
The invention relates to the tire industry, in particular, to the design of the breaker truck radial tires

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.

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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