Pneumatic tire

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly to heavy-duty radial pneumatic tires of relatively small size ratios. Tire comprises toroidal carcass arranged atop two tire beads, undertread band arranged on outer side along carcass radial direction, and tread arranged on outer along radial direction of undertread belt. Undertread belt comprises at least one circular layer arranged on outer side along radial direction of carcass rim part and made up of multiple rubberised cords running along the tire equatorial axis, and at least two inclined layers of undertread belt arranged on circular layer of undertread belt, each being formed by multiple rubberised cords running inclined to tire equatorial axis O. Width of undertread belt circular layers makes at least 60% of the tire total width. Width of at least one inclined layer of undertread belt exceeds that of circular layer. Note that elasticity modulus of the first cords arranged on outer side of undertread belt circular layer is smaller than that of second cords arranged on inner side, across direction of the first cords.

EFFECT: longer life.

10 cl, 3 dwg

 

The technical field to which the invention relates.

The present invention relates to a pneumatic tire having an annular layer brokerage belt with reinforcing elements, such as a cord or thread, covering the tire in the direction of the Equatorial axis.

The level of technology

In the patent JP-F 02-208101 disclosed brickery belt to enhance the carcass of a pneumatic tire, the structure of which contains at least two intersecting layers brokerage belt located around the frame, layers which include reinforcing elements in the form of cords or threads, and intersect one another with placing on the Equatorial axis of the tire, with an angle between them of 10 to 40°; and at least one reinforced layer located under consideration by the belt and is made in the form of a strip that is inserted many reinforcing elements made in the form of wavy or zigzag cords or fabric threads located on the Equatorial axis.

Disclosure of inventions

Recently, due to the need for high speed, low underbody of the car, the tires mounted on the vehicle, are increasingly flat, respectively, the amount of radial expansion of the tread, where the tire is pressurized, the related tendency to increase when the standard internal pressure is AI. The increase in radial expansion of the tread causes a reduction in strength due to increased stress concentration at the edges brokerage belt, becoming, in particular, the factor causing early fracture and delamination edges brokerage belt.

The specificity of tires having a relatively small ratio of the geometric dimensions that radial expansion of the tread near his shoulders, in particular, when the standard internal pressure quite significantly. Taking this into consideration, it was proposed technical solution in order to avoid radial expansion bus through the use of layer ring brokerage belt comprising reinforcing elements placed in the tyre district direction, for example, as in patent JP-A 02-208101.

However, when the ratio of the geometric dimensions of the tire is made relatively small, and it represents the ratio of the magnitude of the height to the width equal to 0.70 or less difficult to avoid radial expansion of the tire, while the width of the annular layer brokerage belt will not be increased. Increase the width of the annular layer brokerage belt, however, causes new problems, discussed below.

Specificity, in the case of increasing the width of the annular layer brokerage belt in the following, p and the rotation of the tire, is that the extreme parts of the ring layer brokerage belt in the transverse direction subjected to Flexural deformation of the circumference in contact with the ground so that the layer brokerage belt extends in the circumferential direction, and therefore the stress state (which hereinafter will be referred to as "amplitude of the input voltage") is repeated and strongly acts on the far side of the ring layer brokerage belt in the transverse direction. As a result, cords susceptible to fatigue failure in extreme parts of the annular layer brokerage belt in the transverse direction. If cords annular layer brokerage belt susceptible to fatigue failure, the annular layer brokerage belt cannot long withstand the stretching in the circumferential direction, causing the tire not long retain the shape and used.

Considering the problem described above, an object of the present invention is a pneumatic tire having brakeman belt with high strength, in particular a radial tire for heavy loads having a relatively small ratio of the geometric dimensions, with increased fatigue resistance of cords in the extreme parts of the annular layer brokerage belt.

Among the many serious problems that occur when the width of the annular layer brè the cluster zone increases, - fatigue failure in the end portions in the transverse direction of the annular layer brokerage zone. The cause of fatigue fracture is the amplitude of the input voltage acting on the cords in the transverse direction of the annular layer brokerage belt when driving the bus. Therefore, the decrease in the amplitude of the input voltage to substantially solving the above problems.

As a result of long research funds reduce the amplitude of the input voltage was detected change of the modulus of elasticity of the cord attached to the ring layer brokerage belt as an effective deterrent against fatigue fracture cords.

The above-mentioned problems are solved by means of a pneumatic tire containing the framework as the basis of a toroidal shape over a pair of sides, brokery zone, located on the outer side in the radial direction of the carcass, and a tread located on the outer side in the radial direction brokerage belt, with brickery belt contains: at least one annular layer located on the outer side in the radial direction of the ring portion of the frame and formed by many rubber cords, continue along the Equatorial axis of the tire; and at least two inclined layer brokerage zone, located on the Col is evom layer brokerage belt, and each of which is formed by a set of rubber coated cords, continued inclined relative to the Equatorial axis Of the tire, and

the width of the annular layers brokerage belt is not less than 60% of the total width of the tire;

width, at least one of the inclined layers brokerage belt is greater than the width of the annular layer brokerage belt; and

the modulus of elasticity of the first cord, located on the edge side of the annular layer brokerage belt in the transverse direction is less than the modulus of elasticity of the second cord, located on the inner side in the transverse direction of the first cords.

Korda ring layer brokerage belt made of steel.

It is preferable that the first cords located on the edge portion in the transverse direction of the annular layer brokerage belt made of elastic steel cord, not prone to stretching, and the second cords located on the inner side in the transverse direction relative to the first, is not subject to tension, and have a linear, wavy or zigzag form.

The first cords located on the outer part of the annular layer brokerage belt in the transverse direction, is made of elastic cords, not prone to stretching, and the second cords located on the inner side in the transverse n the Board relative to the first not subject to tension, have a wavy or zigzag form.

The first cords are located on the far side in the transverse direction of the annular layer brokerage belt and made of organic fibers, and the second cords located on the inner side in the transverse direction relative to the first cords, made in the form of steel cords.

Annular layers brokerage belt formed spiral weave on the three-part frame, and the material of the strips is formed of at least one rubber-coated cord.

It is preferable that the width of each of the end portions in the transverse direction of the annular layer brokerage belt having a relatively low modulus of elasticity ranges from 5 to 20% of the total width of the annular layer brokerage belt.

The modulus of elasticity in tensile strain, equal to 1.8% of first cords located in the extreme parts in the transverse direction of the annular layer brokerage belt has a value in the range from 40 to 100 GPA, and the modulus of elasticity in tensile strain in 1.8% of second cords located on the internal parts in a transverse direction relative to the first cord has a value in the range from 80 to 210 GPA.

Each of the end portions in the transverse direction of the annular layer brokerage belt having a low modulus of elasticity consider is Ino first cords, formed spiral braided cords.

Edge tatting and edge finish weaving are located on the inner side in the transverse direction, and not at the edges farthest from the middle in the transverse direction of the annular layer brokerage belt.

According to the present invention, it is possible to increase the width of the annular layer brokerage belt, reducing the radial expansion of the tread of a tire having a relatively small ratio of the geometric dimensions, and also to reduce fatigue cords in the annular layer of the belt. In the result, it is possible to obtain a tire having a relatively small ratio of the geometric dimensions, in which the strength of the belt is significantly improved.

Additionally, the structure, as noted above, can significantly reduce the cords break in the transverse direction on the outer side with an effective reduction of the radial expansion of the outer parts of the tread by pumping a tire standard internal pressure.

The structure of the present invention, as noted above, can significantly reduce the radial expansion of the outer parts of the tread by pumping a tire standard internal pressure and to increase the reliability form the transverse outer edge due to the reinforcing bend high is the power.

Edge tatting and edge finished weaving, as the trailing edge of the transverse outer side reinforced cords, protect by strengthening cords located on the extension of the outer side in the transverse direction, since these edges are cracking and delamination starting from the edge tatting or edges are finished weaving, and can from this destruction to be protected.

Brief description of drawings

The present invention is illustrated by drawings, which presents the following:

figure 1 - cross section in the transverse direction of the tire and detailed types of belt tire according to the invention;

figure 2 is a cross section of the layer of the ring belt of the tire according to the invention;

figure 3 is a detail view of the belt of the tire according to the present invention.

The implementation of the invention

Pneumatic tire shown in detail in figure 1. The bus has a frame 1 made in a toroidal shape over a pair of bead portions (not shown); brickery zone 4, located on the outer side of the carcass in the radial direction, brokery zone comprising at least one layer (two layers is shown for example in figure 1), the circuit layers 2A and 2b brokerage zone, located on the outer ring side of the frame 1, formed some rubber cords, extended along the Equatorial axis Of the tire, and, what about the least two layers (two layers is shown for example in figure 1), inclined layers 3A and 3b brokerage zone, located on the annular layer brokerage belt so that the cords in one layer 3A intersect with the cord in the other layer 3b, and each formed of a number of rubberized cords, extended in an inclined direction with respect to the Equatorial About the axis of the tire; and a tread 5, located on the outer side in the radial direction brokerage belt 4.

In the present embodiment, the width BW1 of annular layers 2A and 2b brokerage belt shall be not less than 60% of the total width TW of the tire and is narrower than the width of the adjacent layer inclined brokerage zone. First, to reduce the radial expansion of the tread within a certain range, when the tire is under the standard inner pressure, the width of annular layers brokerage belt should be at least 60% of the total width TW of the tire because the scope of the manifestations of radial expansion is relatively large when the area covers from 60 to 70% of the total width TW of the tire, should be provided with circumferential stiffness to reduce radial expansion. The upper limit of ring stiffness BW1 annular layers 2A and 2b brokerage belt, preferably, should be 90% to maintain the shape of the tire.

Additionally, the width of at least the underwater of the inclined layers brokerage belt (width BW2 inclined layer 3A brokerage belt, for the example shown in figure 1) must be greater than the width of the annular layer 2b brokerage belt, for safeguarding the rigidity of the tread, required for resistance to wear and bus, providing movement in turn.

For example, as shown in figure 1, the width of the annular layer 2A and 2b brokerage belt are the same. However, these values may differ from one another. In particular, when the strength in the transverse direction Central portion of the annular layer brokerage belt is increased, it is possible that the width of the annular layer brokerage belt was made greater than the width of the other annular layer brokerage belt.

The width of the inclined layer 3b brokerage belt, preferably, should be wider than the annular layer brokerage belt to increase the absolute rigidity of the tread portion, and thus, increase the resistance to wear of the tire. For example, as shown in figure 1, the layer 3A inclined brokerage belt is wider than the layer 3b inclined brokerage zone. In the case where the width of these layers are the same, manifested by the abrupt change in stiffness, the resistance to delamination of the extreme parts of the layer may be reduced.

In the case when the width of the annular layer brokerage belt is made sufficiently wide, fatigue cord is more likely going on the t in the extreme parts in the transverse direction of the annular layer brokerage belt, therefore, it is difficult to achieve a long service life of the tire. Fatigue failure in the cords in the outer end portions in the transverse direction of the annular layer brokerage belt is because the amplitude of the input voltage is manifested in the outer end portions in the transverse direction of the annular layer brokerage belt when the tire is in rotation. The containment of these stresses significantly to solve. Therefore, in the present invention in end portions in the transverse direction of the annular layer brokerage belt modulus of elasticity of the first cord, located on the outer side in the transverse direction of the annular layer brokerage zone is less than the modulus of elasticity of the second cord, located on the inner surface in the transverse direction relative to the first cords so that the stresses concentrate at the edges of the parts in the transverse direction of the annular layer brokerage belt are reduced.

The peculiarity of the movement of the tires on the ground is the occurrence of the amplitude of the voltages at the edges of the annular layer brokerage belt in the transverse direction. These amplitude of the input voltage occurs because the cords are located on a circle, and the maximum tensile stress acting on the end portion of the tread in the contact patch with the surface, call the characteristic action of tensile forces on the contact area of the tread, because the tire is inflated to the standard pressure of air. The reduction of the bus load, i.e. reducing the amount of Flex of the tire, can be considered as a method of reducing the amplitude of the tension, but this method is not compatible with the smooth motion of the bus.

At the location of the cords around the circumference of the contact patch, if the modulus of elasticity is relatively small and the edges of the layer of the ring belt in the transverse direction coincide with the contact patch, the tensile stress in the cords is relatively small. However, if the modulus of elasticity of all cords annular layer brokerage belt is small, the amount of radial expansion when the tire is inflated to the standard pressure of the air increases and it is difficult to retain the shape of the tire. Therefore, assigning the modulus of elasticity of the first cords located on the outer side in the transverse direction of the circular direction is lower than the modulus of elasticity of the second cord, located on the inner side in the transverse direction of the first cords, reduced the increase in radial expansion when the tire is inflated to the standard pressure, to the extent possible, in accordance with the load value at the edges of the layer ring brokerage belt in the transverse direction in the contact patch effectively restrained and fatigue cords may be reduced.

Determination of modulus of elasticity (first) cords on the outer side of the annular layer brokerage belt in the transverse direction of 0.3 to 0.8 times greater than the modulus of elasticity (second) cords in the transverse direction relative to the first cords effectively suppresses the amplitude of the tensile stresses described above.

The width t of the other part, located on the far side in the transverse direction of the annular layer brokerage belt having a relatively low modulus of elasticity (figure 1), preferably from 5 to 20% of the total width. When the above-mentioned width t part on the transverse edge of the face is less than 5% of the total width of the annular layer brokerage belt, destruction happen, because a relatively high modulus of elasticity there is in the region where the amplitude of the load acts on the annular layer brokerage belt in a wide range. In the case where the above-mentioned width t exceeds 20% of the total width of the annular layer brokerage belt, it is difficult to restrain radial expansion of the tire.

In the present embodiment, the fixed modulus of elasticity (first) cords located on the outside or on the edge side in the transverse direction of the layer ring brokerage belt less than the modulus of elasticity (second) cord, located on the inner side in the transverse to the direction of the first cords" specifically presents contiguous locations cords 6 and cords 7, having different moduli of elasticity, as shown on the form, revealing the view of the annular layer brokerage zone in figure 1 and the cross-section in the transverse direction of the annular layer brokerage zone in figure 2.

Specific location Korda demonstrates annular layers 2A, 2b brokerage zone on figure 1 and figure 2, many cords 6, having a relatively low modulus of elasticity (cords with a low modulus of elasticity), located on the edges of the parts of the annular layer brokerage belt in the transverse direction and lots of cords 7, having a modulus of elasticity greater than the cords 6, located in the transverse direction inside the annular layer brokerage belt 6.

An example of a basic arrangement of the annular layer brokerage zone corresponding to a variant implementation of the present invention, including the location from one to several dozen cords with a low modulus of elasticity 6 in the transverse direction of the annular layer brokerage belt, and cords of high modulus of elasticity 7, in the transverse direction inner side.

It is known that the deformation strain in the contact patch with the ground is approximately 1.8% for the actually measured values. It is therefore important that the modulus of elasticity of the cords provided within the module of elasticity of the cords deformation strain of 1.8%.

For example, alasti the hydrated cord formed of metal repeatedly twisted structure (4×(0.28 mm+6×0.25 mm)), the so-called "wysokowydajny cord", suitable as viskoelasticnog cord. Such visakorttini cords can be manufactured, for example, using steel strands, which form a cord on a form similar woven from twisted fibers Corda was intended to apply to the limit of elasticity of the filaments, preliminary and final twist. However, as visakorttini cords described above are expensive, it is impractical to use them for insertion in the annular layers brokerage belt.

On the other hand, cord, formed by waves or zigzags (see the structure of the annular layer brokerage zone 2b in figure 1) or metal inextensible cord, that is a cord with a braided layers (3+9+15)×0.23 mm, suitable as cord with a high modulus of elasticity. The modulus of elasticity vysokochetkogo cord has a deformation strain of 1.8% and in General, lower than wavy or zigzag cords or inextensible metal cords. On the contrary, the use of cord with organic threads, cords with a low modulus of elasticity and steel cord, as the cord with a high modulus of elasticity, can satisfy the conditions of the modulus of elasticity described above.

Cord with a low value of modulus of elasticity at the level of from 40 to 100 HPa is suitable for use in the project in order to reduce radial expansion when the tyre is inflated to the standard internal pressure, and to reduce fatigue fracture in the extreme parts of the annular layer brokerage zone. Cord with a high modulus of elasticity at the level of from 80 to 210 GPA is designed to improve ride comfort (vibration damping), and at the same time satisfactorily reduces the radial expansion of the outer parts of the tread when pumped bus standard internal pressure.

In the present invention the modulus of elasticity of the cord is represented by values obtained during bench tests: disconnected pneumatic tyre and the associated rubber cord are subjected to test tensile cord, and graph "load - extension", the test result is calculated from the gradient (slope) of the tangential tensile 1.8% on the graph, and is divided, thus, the obtained value for the cross-sectional area of the cord. Cords having the property of derestimate, are investigated within a test tire, and when the cords cut off from the bus, while stretching to 1.8% of the length.

Figure 3 the area having a width t in the transverse direction of the far side of the ring layer brokerage belt (outer side region t) and the internal side of the field, described above, may be structured, for example, by multiple spiral weave on the outer side of the frame 1 tape the shaped body, with constant width, composed of one or a small number posted near rubber cords 6 and 7. During the formation of circular layers brokerage belt spiral weaving ribbon-like body thus referred to the external side of the area and the inside area can be manufactured with high efficiency.

In a preferred embodiment of the present invention, if the edge tatting and edge finish weaving (as trimmed edges) cords 6 are exposed to in the farthest from the middle region in the transverse direction of the external field t ring layer brokerage belt when in the circumferential direction of the layer brokerage belt formed of ribbon-like body, as described above, with cracks and/or delamination can start from the edge tatting, as a starting point and continue to the edge of the finished weaving. Therefore, in this embodiment, the edges of commencement and completion of the braiding cords 6, preferably placed on the inner side in the transverse direction remote from the edges closer to the middle of the outer region t ring layer brokerage belt, with cracks and/or delamination, as described above, can be prevented.

The order in which the edges of commencement and completion of the braiding cords 6 are placed inside the outer region t Col is avago layer brokerage belt, and not on its outer edge, the most remote from the middle in the transverse direction, as described above, forms the above-mentioned band-shaped body, for example, spiral weave from the inner edge region t in the outer side toward the most remote edge, which leads to the formation region t ring layer brokerage belt on the inner side in the radial direction, and then the ribbon-like body in the transverse direction passes through the protector, designed for this surface, and by a spiral weave passes from the outermost edge to the outer edge in the transverse direction to form the outer region t ring layer 2b brokerage belt on the inner side in the radial direction.

Examples

Structure brokerage belt shown in figure 1 and was used in versions of the specification shown in table 1, where tires for trucks or buses size 435/45R22.5 were produced for testing. Each tire was connected with the rim of size 1, i.e. 14,00×22,5. After injection of the internal pressure of 900 kPa, each tire was subjected mileage 30,000 km on the bench under bench load of 63.7 kN at a speed of rotation of the drum 60 km/h to separation of the tire and count the number of cords, destroyed from fatigue in the annular layers of the belt. The result is shown in table 1 as the value of the index, predstavljauwego the smallest number ustalosti-destroyed cords and thus the best for strength design.

"Modulus of elasticity" in the examples according to the present invention is represented by the modulus of elasticity measured at a deformation destruction of 1.8%, when each cord was subjected to the test on a tensile testing machine, and the modulus of elasticity of each cord was expressed by an index relative to the modulus of elasticity of the cord, an exemplary instance, taken as 100. The lowest index presents a low modulus of elasticity. Code with winding layer (1+6)×0.32 mm applied for the diagonal belt with a density of 24.5 cords/50 mm High tensile cords 4×(1+0.28 mm+6×0.25 mm) were applied in the extreme parts in the transverse direction of the annular layer brokerage zone with a density of 20 cords/50 mm, while the inextensible wavy cords (3+9+15)×0.23 mm was applied to the inner side in the transverse direction of the annular layer brokerage zone with a density of 22.5 cords/50 mm

Table 1
Standard sampleCompare
telin. example
Example 1Example 2Example 3Example 4Example 5
Total bus width43 435435435435435435
Width (mm) annular layer 2b brokerage belt300300300300300300300
Width (mm) inclined layer 3b brokerage belt360360360360360360360
Angle (deg) inclined layer 3b brokerage belt50505050505050
Width (mm) inclined layer 3A brokerage belt330330330330330330330
Angle (deg) inclined layer 3A brokerage belt50505050505050
The modulus of elasticity (index) to the cord with a low modulus of elasticity of the annular layer brokerage belt1001209080608060
The modulus of elasticity for steel cords with a high modulus of elasticity of the annular layer brokerage belt100100100100120120120
The width of the cord with a small modulus of elasticity30303030303030
Durability (index), opposite the index oustalet the th strength 10015060250200
(Mm)-3030303000
R (mm)-3030303000
Evaluation of durability of brokerage belt10095115121126110112

Further, the distance between the edge tatting cords on the outer region t in each instance tyres consistent with the present invention and corresponds to the edge in the transverse direction of the layer ring brokerage belt, marked as the distance Q (mm), and the distance between the edge of the finished braiding cords and the same edges in the transverse direction of the layer Kohl is avago brokerage belt marked as R (mm). The magnitude of these distances are shown in table 1. In the examples of the present invention, the values of Q and R being both zero means that the structure is formed as follows: initial weaving cords in the outer region t from the most remote end in an external transverse direction of the layer ring brokerage belt; weave the cord in the direction of the inner side to the width t of the outer region; and then the reverse in the transverse direction, in which the cord passes through the tread surface and weave the cord to each the most remote region in the transverse direction of the layer of the ring belt, so that the edge of the tatting and the edge of the finished weave reinforced cord in the outer region came out on the other side in the transverse direction of the layer of the ring belt.

In addition, each of the tires described above was mounted on a rim having a size 14,00×22,5. Each tire after injection internal pressure is adjusted to 900 kPa, was subjected to loading is 49.0 kN at a speed of rotation of the drum 60 km/h until, until you appear apparent stratification. The results (calculation of time before destruction) are shown in table 1 as an index value corresponding to an exemplary instance with index of 100 units. A larger index value corresponds to a greater life of the structure.

Now is sabreena is intended for pneumatic tire for heavy loads, having an annular layer brokerage belt, consisting of toughened cords, built mostly parallel to one another along the Equatorial axis of the tire.

1. Pneumatic tire containing the framework as the basis of a toroidal shape over a pair of sides, brokery zone, located on the outer side in the radial direction of the carcass, and a tread located on the outer side in the radial direction of the belt, thus brickery belt contains: at least one annular layer located on the outer side in the radial direction of the ring portion of the frame and formed by many rubber cords, continue along the Equatorial axis of the tire; and at least two inclined layer brokerage zone, located on the annular layer brokerage belt, and each of which is formed by many rubber cords, continued inclined relative to the Equatorial axis Of the tire, characterized in that
the width of the annular layers brokerage belt is not less than 60% of the total width of the tire;
width, at least one of the inclined layers brokerage belt is greater than the width of the annular layer brokerage belt; and
the modulus of elasticity of the first cord, located on the edge side of the annular layer brokerage belt in the transverse direction is less than the modulus of elasticity of the second cord,located on the inner side in the transverse direction of the first cords.

2. Pneumatic tire according to claim 1, characterized in that the cords of the ring layer brokerage belt made of steel.

3. Pneumatic tire according to claim 1, characterized in that the first cords located on the edge portion in the transverse direction of the annular layer brokerage belt made of elastic steel cord, not prone to stretching, and the second cords located on the inner side in the transverse direction relative to the first, is not subject to tension, and have a linear, wavy or zigzag form.

4. Pneumatic tire according to claim 1, characterized in that the first cords located on the edge portion in the transverse direction of the annular layer brokerage belt made of elastic cords, not subject to tension, and second cords located on the inner side in the transverse direction relative to the first, is not subject to tension, and have a wavy or zigzag form.

5. Pneumatic tire according to claim 1, characterized in that the first cords are located on the far side in the transverse direction of the annular layer brokerage belt and made of organic fibers, and the second cords located on the inner side in the transverse direction relative to the first cords, made in the form of steel cords.

6. Pneumatic tire according to claim 1, characterized in that kalawy the layers brokerage belt formed spiral weave on the three-part frame, as the material of the strips is formed of at least one rubber-coated cord.

7. Pneumatic tire according to claim 1, characterized in that the width of each of the end portions in the transverse direction of the annular layer brokerage belt having a relatively low modulus of elasticity ranges from 5 to 20% of the total width of the annular layer brokerage belt.

8. Pneumatic tire according to claim 1, characterized in that the modulus of elasticity in tensile strain, equal to 1.8%, the first cords located in the extreme parts of the sides in the transverse direction of the annular layer brokerage belt has a value in the range from 40 to 100 GPA and a modulus of elasticity in tensile strain in 1.8% of second cords located on the internal parts in a transverse direction relative to the first cord has a value in the range from 80 to 210 GPA.

9. Pneumatic tire according to claim 1, characterized in that each of the end portions in the transverse direction of the annular layer brokerage belt having a low modulus of elasticity relative to the first cords, formed spiral braided cords.

10. A pneumatic tyre according to claim 9, characterized in that the edge of the tatting and the edge of the finished netting are located on the inner side in the transverse direction, and not at the edges farthest from the middle in the transverse direction of the annular layer of the break the nogo zone.



 

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The invention relates to road transport

FIELD: road vehicles.

SUBSTANCE: proposed tire has radial body with one or several breaker layers on place close to outer surface, and strengthening layer with nylon cord wound in spiral over breaker. It is desirable that tread belt of tire be formed by underlayer and outer layer, one placed on the other, elasticity and/or hardness characteristics of first layer remaining stable at temperatures within 20 and 110oC.

EFFECT: improved performance characteristics of tires.

23 cl, 4 tbl, 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: transport engineering.

SUBSTANCE: invention relates to pneumatic tyre with radial carcass reinforcement over which ridge reinforcement consisting of at least two working layers of ridge formed by metal reinforcement members is arranged in radial direction. Said reinforcement members intersect from one layer to the other forming angles of 10 to 35° with circumferential direction. Ridge reinforcement includes at least one additional reinforcement formed by metal reinforcement members orientated in circumferential direction. Additional reinforcement consists of at least two layers of metal members of small diameter not exceeding 0.6 mm. Metal reinforcement members of additional reinforcement are assemblies, type 1 x n where n is from 2 to 5, made of steel featuring high breaking strength SHT, and diameter of threads is within 12/100 and 30/100.

EFFECT: increased strength and wear resistance of tyres.

10 cl, 3 dwg

FIELD: transportation.

SUBSTANCE: invention is attributed to pneumatic tire which has radial reinforcement of frame and contains crest reinforcement formed by at least two crest working layers created of inextensible reinforcing elements intercrossing from one layer to another forming with circumferential direction the angles in the range of 10 to 45°. Tire tread connected with two beads by means of two sidewalls is located over this radial frame reinforcement in radial direction. Crest reinforcement contains at least one layer of circumferential reinforcing elements which has axial width less than axial width of at least one of crest working layers. Ratio of axial width of at least one layer of circumferential reinforcing elements to axial width of tire tread is equal to value which exceeds 0.6 and preferentially exceeds 0.65. Ratio of tire tread axial width to maximum axial width of this pneumatic tire is equal to value exceeding 0.89.

EFFECT: tire strength and reliability is improving.

17 cl, 5 dwg

FIELD: transportation.

SUBSTANCE: invention is attributed to pneumatic tire for which factor of H/S type has value exceeding 0.55 and which has radial reinforcement of frame and contains flange reinforcement formed by at least two flange working layers created of inextensible reinforcing elements intercrossing from one layer to another forming with circumferential direction the angles in the range of 10 to 45°. Tyre tread connected with two beads by means of two sidewalls is located over this radial frame reinforcement in radial direction. Crest reinforcement contains at least one layer of circumferential reinforcing elements. Value of ratio of crest block width at the end of shoulder area to crest block width at center circumferential plane is less than 1.20, and value of ratio of axial width of at least one layer of circumferential reinforcing elements to axial width of tire tread exceeds 0.5 and preferably exceeds 0.6.

EFFECT: tire strength and reliability is improving.

23 cl, 5 dwg

FIELD: transport.

SUBSTANCE: proposed pneumatic tire incorporates a carcass and a tread formed by, at least, two tread layers made up of rigid reinforcing elements with alternating crossed-over layers forming, with the peripheral direction, the angles varying from 10° to 45° on the tread crown zone. The said tread crown zone is jointed to two beads by side walls. The tread side thickness-to-tread center thickness ratio makes below 1.20 and the tread crown zone-to-tire total width ratio exceeds or equals 0.89.

EFFECT: higher strength and reliability.

25 cl, 5 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

Pneumatic tire // 2405682

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly to heavy-duty radial pneumatic tires of relatively small size ratios. Tire comprises toroidal carcass arranged atop two tire beads, undertread band arranged on outer side along carcass radial direction, and tread arranged on outer along radial direction of undertread belt. Undertread belt comprises at least one circular layer arranged on outer side along radial direction of carcass rim part and made up of multiple rubberised cords running along the tire equatorial axis, and at least two inclined layers of undertread belt arranged on circular layer of undertread belt, each being formed by multiple rubberised cords running inclined to tire equatorial axis O. Width of undertread belt circular layers makes at least 60% of the tire total width. Width of at least one inclined layer of undertread belt exceeds that of circular layer. Note that elasticity modulus of the first cords arranged on outer side of undertread belt circular layer is smaller than that of second cords arranged on inner side, across direction of the first cords.

EFFECT: longer life.

10 cl, 3 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

Pneumatic tire // 2456168

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Tire carcass ply is laid between two double beads. Breaker ply is recessed on carcass ply outer peripheral side in tread section. Tread is provided with multiple main grooves extending along tire circle. Maximum depth of each main groove varies from 8.5 mm to 15.0 mm. Relationship between height of actual tire profile SH and that of profile SHstd calculated from tire size is set to 0.97≤α≤0.99. Relationship between contact areas makes 65-70% under conditions of measurements whereat air pressure makes 200 kPa and load making 50% of bearing capacity at said air pressure. Mean contact pressure P varies from 300 kPa to 400 kPa.

EFFECT: longer life, efficient braking on moistened surface.

13 cl, 4 dwg, 1 tbl

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