Pneumatic tire for heavy vehicles

 

On each side of the Equatorial plane of the tire between the edges of at least two adjacent to each other in the radial direction of the layers of the crest is at least one polylog formed metal inextensible cord threads. This increases the strength of the tire. 6 C.p. f-crystals, 3 ill.

The present invention relates to pneumatic tires with radial reinforcement frame type “Genie Civil”, intended for use on heavy vehicles, and heavy road-building machines. More specifically, this invention relates to valves of the crest for such a pneumatic tire.

Such a pneumatic tyre type “Genie Civil”, schematically shown in Fig.1, in a known manner includes a valve frame 1 formed of a single layer of inextensible metal cord threads, made of steel, which are fixed in each Board on-Board ring 2 for the formation of turnover 10, the end of which is located essentially at the level of the maximum axial width of the reinforcement frame.

On top of this valve frame in the radial direction is located layer 20 and the shaped elements 21, made the mi layers 31 and 32, on the other hand, in the radial direction, the two so-called protective layers 51 and 52.

Layers of the ridge formed metal inextensible cord threads, made of steel, parallel to each other in each layer 31, 32 and crossed from one layer 31 to the other layer 32, forming with the circumferential direction of this pneumatic tire angles, the value of which can be made in the range from 15 to 45. When this axial width of the working layer is usually from 60 to 80% of the maximum axial width of the reinforcement frame 1.

The protective layers 51, 52 are typically formed of a metallic elastic cord threads, made of steel, parallel to each other in each layer 51, 52 and crossed from one layer 51 to another layer 52, also forming with the circumferential direction angles, the value of which can be made in the range from 15 to 45. These protective layers 51, 52 typically have a width smaller than the width of the widest working layer.

Finally, cord thread outside in the radial direction of the working layer 32 typically overlap with cord internal threads in the radial direction of the protective layer 51.

Over most of this valve GrEbner>As you know, fittings crest radial pneumatic tires and, more specifically, the pneumatic tires of large size, undergoes significant deformation, which generate between the edges of two overlapping layers of longitudinal and transverse shear stresses (longitudinal shift is more significant than the transverse, in the case where cord thread these overlapping layers form with the County towards the corners of the relatively small size) simultaneously with the stress of separation, which represent the radial stress, causing a tendency to separation in the radial direction of the edges of the two layers.

The occurrence of mechanical stresses associated, primarily, with the pressure of the inflating this pneumatic tire, which acts in such a way that the so-called opoyasyvayuschego pressure between the valve cage and valve crest causes a tendency to cause circumferential expansion valve of the ridge.

In addition, these mechanical stresses arise due to the impact load, which carries this pneumatic tyre during rolling on the road and in the formation of the contact surface of this pneumatiikkatuotteita turns this pneumatic tire during its movement along the road.

Mechanical shear stresses cause cracks in the rubber mixture, which is located in the vicinity of the end of the shortest layer, and these cracks tend to spread in the rubber mixture and a very negative impact on the resistance of the armature of the ridge, and therefore the resistance of this pneumatic tires in General.

Some improvement in the above-mentioned resistance has been achieved through the reinforcement of the crest of at least one protective layer, having an axial width greater than the axial width of the widest in the axial direction of the working layer.

Another possible technical solution according to the patent FR 2421742, is in a more favourable distribution of mechanical stresses, causing the separation of the working layers of the ridge and resulting rotation of this pneumatic tire during its movement on the road, by increasing the number of operational layers of the ridge, using, for example, four working layer of reinforcing elements, crossed from one ply to the other and forming with the circumferential direction angles, which can have a value in the range from 15 to 35and Respray way to each of these four working layers had the same thickness and the same stiffness under tension, measured perpendicular to the reinforcing elements of the working layer. This increase in the number of working layers of reinforcing elements leads to certain drawbacks, in particular, in the center of the armature of the ridge, where the number of layers used greatly affects the bending stiffness of the crest of this pneumatic tyres.

In this invention it is proposed to increase the resistance to separation between work reinforcement layers of the ridge with one or more advanced protective layers and increase thus the resistance of such valves ridge pneumatic tires for heavy transport and road-building machines without increasing the number of layers in the Central part of the control valve of the ridge.

Pneumatic tire in accordance with the invention, containing at least one radial reinforcement of the frame, are fixed in each Board on at least one side of the ring, forming therein a turnover, and on top of the valve cage and outside of it in the radial direction is located the valve of the ridge formed by Usich elements, parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction angles,’ having a value in the range from 15 to 35, characterized in that at least one polylog formed metal inextensible reinforcing elements and having a width L’, is located on each side of the Equatorial plane in the radial direction between the edges of at least two adjacent to each other in the radial direction of the working layers of the ridge, and outer and inner axial ends of polsloe are located outside in the axial direction toward the end of the widest working layer and the inside in the axial direction toward the end of the least wide working layer at distances that make up at least L’/5, moreover, the reinforcing elements of polsloe form with the County towards some angleon the one hand, greater than the absolute value of 25and on the other hand, greater than the absolute value of the largest of those corners, which form with the circumferential direction p is sustained fashion, one polylog is located between the two working layers, closest to the valve frame. Regardless of whether one or two polsloe are in this case in the construction of pneumatic tires, the reinforcing elements of each polsloe preferred way overlap with the reinforcing elements of the working layer, which is located in the radial direction from the inside from polsloe and the closest in the radial direction of the valve frame.

The widths of the different reinforcement layers of the ridge, which is not usually the same for these layers, such that the functional layer is located in the radial direction from the inside of each polsloe is less wide than the working layer located radially outside from polsloe.

This implementation on each side of the Equatorial plane of the two available polusaev located between the two edges adjacent to each other in the radial direction of the working reinforcement layers of crest, consisting of three such layers, the second polylog formed of the same metal reinforcing elements and the supporting elements of the first polsloe, and reinforcing elements preferred way overlap with the reinforcing element of the safety valve, formed by two layers of so-called elastic metal reinforcing elements. One of the protective layers, the preferred way inland in the radial direction of the protective layer, has an axial width slightly greater than the greatest axial width of the working layers of the ridge, while the axial width of the second protective layer has a value that lies in the range between the values of the axial width of working reinforcement layers of the ridge.

Other characteristics and advantages of the invention will be better understood from the following description of non-restrictive examples of its implementation, where references are given in Appendix figures, among which:

- Fig.1 is a schematic view in longitudinal section of the valve of the crest of the pneumatic tire for heavy transport and road-building machines in accordance with the existing state of the art in this field,

- Fig.2 is a schematic view in longitudinal section of a first variant of implementation of the armature crest in accordance with the proposed invention,

- Fig.3 is a schematic view in longitudinal section of a second variant of implementation of the armature of the ridge in the m the armature of the ridge which is shown schematically in Fig.2 is a designed for heavy wheeled vehicles pneumatic tire of the type “Genie Civil”.

For such a pneumatic tire having a large size, the aspect ratio H/S typically has a value of 0.80, and here H is the height of this pneumatic tyres on its mounting rim, a S is the maximum axial width of this pneumatic tire when it is mounted on its operating mounting rim and inflated to recommended to her pressure.

This pneumatic tyre R contains radial valve frame formed of a single layer of 1 inextensible metal cord threads are fixed in each Board on at least one side of the ring (Fig.2 is a side ring not shown) for the formation of turnover, the end of which is located essentially on a straight line corresponding to the maximum axial width of the reinforcement frame and parallel to the axis of rotation of this pneumatic tyres.

On top of the layer of frame 1 in the radial direction is located in the Central part of the layer 20 of rubber mixtures, and in its lateral parts are two profiled element 21 is to minirovat differences in the meridional curvature between the valve cage and valve crest.

Indeed, from the outside in the radial direction from the layer and profiled elements is working valves of the ridge 3 and the protective sheath 5.

The working armature crest in accordance with the invention, schematically shown in Fig.2, contains primarily three working layer 31, 32 and 33, continuous in the axial direction and respectively having a width L31, L32 and L33, and the least wide layer 31 in the example considered here the implementation is the closest in the radial direction of the armature frame 1 and the width L31, L32 and L33 increase in the radial direction from the inside out.

The three above-mentioned widths are respectively 0.5 So, 0,55 Soand 0,66 Sowhere the value of Sorepresents the maximum axial width of the reinforcement frame.

Three layers of reinforcement ridge 31, 32 and 33 are formed of inextensible metal cord threads parallel to each other in each layer and crossed from one layer 31, 32 to the other layer 32, 33, forming with the circumferential direction of this pneumatic tire angles1,2 and3, the value of which is respectively +18, -24 and +18exceeding angles1 and2 and constituting -33.

The axial width L’ of each polsloe 34 has a value equal to 0.33 So. This inner axial end of polsloe 34 is located in the axial direction from the inside from the end of the working layer 31 and at such an axial distance from the Equatorial plane XX’, so that the difference between half the axial width of the least wide working layer 31 and the distance was 0,22 L’, so that there has been some overlap between the inner axial edge of polsloe 34 and the edge of the continuous in the axial direction of the working layer 31, the least extensive in the axial direction and located inside in the radial direction.

As for the outer axially in the who working layer 32 and at such an axial distance from the Equatorial plane XX’, to the difference between the distance and half the axial width of the widest working layer 32 were 0.37 L’.

Protective sheath, which complements the armature of the ridge and is located radially outside from above the working valve, formed by two layers 51 and 52, formed of elastic cord yarns made from steel.

In this case call such elastic cord thread, which are under the force of tension equal to the breaking load, elongation equal to 4%, while used cord thread called inextensible in the case when their elongation, measured at the load application, component of 10% from destroying their load, has a value of less than 0.2%.

Cord thread two protective layers are crossed from one layer 51 to the subsequent layer 52, forming with the circumferential direction angles equal respectively -24 and +24and cord threads of the protective layer 51, closest to the valve frame, crossed with the cord threads of the working layer 33, the most remote from the valve frame.

The axial width L51 protective layer 51 is substantially greater than the width L33 of the most extensive is the first towards the end of polsloe 34 thus, to the protective layer 51 overlaps in the axial direction of the all set of working layers and inserted between the intermediate polusaev. When this axial width L52 of the second protective layer is essentially equal to half the sum of the values of the width L32 and L33 two of the widest working layer.

In Fig.3 schematically shows an embodiment of the valve of the ridge containing two polsloe 34, respectively located between the working layers 31 and 32 and between the working layers 32 and 33, and the layers 31, 32, 33 in all its points the same as the layers described above. The same can be said about the first polsloe 34 relative to polylog shown in Fig.2.

As for the second polsloe 34, located between the working layers 32 and 33, it is formed of cord yarns, identical to the cord threads of the first polsloe and forming with the circumferential direction an angleequal 33but crossing the cord threads of the first polsloe 34.

With regard to the axial width of this second polsloe, it is subject to the principles set forth above, subject to the adoption of known precautions to ensure that the two ends of this layer are not located in one the Oh wheeled vehicle, containing at least one radial reinforcement frame (1), fixed in each Board on at least one side of the ring, forming therein a turnover, and over the valve frame (1) and outside of it in the radial direction is located the valve crest (3) formed by at least three so-called working layers (31, 32, 33) formed of inextensible metal reinforcing elements parallel to each other in each layer and crossed from one layer (31, 32) to another layer (32, 33), forming with the circumferential direction angles,1,2, having a value of from 15 to 35, characterized in that at least one polylog (34), formed metal inextensible reinforcing elements and having a width L', on each side of the Equatorial plane XX' is located in the radial direction between the edges of at least two adjacent to each other in the radial direction of the working layers of the ridge(31, 32; 32, 33), moreover, the outer and inner axial ends of polsloe (34) are located outside in the axial direction from the end of the widest working layer and the th least L'/5, moreover, the reinforcing elements of polsloe (34) is formed with a circumferential direction of some angleon the one hand, greater than the absolute value of 25and on the other hand, greater than the absolute value of the largest of those corners, which form with the circumferential direction of the reinforcing elements of the two working layers, on the order of 5 to 15.

2. Pneumatic tyre under item 1, characterized in that one polylog (34) is located between the two working layers (31, 32), closest to the valve frame (1).

3. Pneumatic tyre under item 1 or 2, characterized in that the reinforcing elements of each polsloe (34) overlap with the reinforcing elements of the working layer (31, 32) located in the radial direction from the inside from polsloe (34) and the closest in the radial direction of the valve frame (1).

4. Pneumatic tyre on p. 3, characterized in that the widths of the working layers (31, 32, 33) of the valve crest (3) are such that the functional layer (31, 32) located in the radial direction from the inside of each polsloe (34) has a smaller width than the working layer (32, 33) located outside in the radial direction from polsloe (34).

5. Pneumatically plane XX' of the two polusaev (34), located between two edges (31, 32; 32, 33) adjacent in the radial direction of the working reinforcement layers of crest, consisting of three operational layers (31, 32, 33), the second polylog (34) is formed of the same metal reinforcing elements and the supporting elements of the first polsloe (34), and the elements of the second polsloe overlap with elements of the first olukoya.

6. Pneumatic tire according to any one of paragraphs.1-5, characterized in that on top of working reinforcement ridge (31, 32, 33, 34) in the radial direction is protective sheath (5), formed by two protective layers (51, 52) formed of an elastic metal reinforcing elements, and one of the protective layers (51, 52) has an axial width L51 (L52), exceeding the maximum axial width of the working layers of the ridge.

7. Pneumatic tyre on p. 6, characterized in that the protective layer (51, 52) having an axial width L51 (L52), exceeding the maximum axial width of the working layers is an inner radial direction of the protective layer (51), whereas the width of the second protective layer (52) has a value L52 enclosed between the two highest values of the width of the working layers.

 

Same patents:

The invention relates to the automotive industry

The invention relates to the automotive industry and is designed primarily for vehicles of high capacity

The invention relates to the tire industry, in particular for the manufacture of tyres for two-wheeled vehicles such as motorcycle tires

Pneumatic tyre // 2120388

The invention relates to the tire industry and can be used in the manufacture of 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

Up!