Tire for heavy or large capacity trucks including ply of circumferential reinforcing elements consisting of central part and two axially outer parts

FIELD: transport.

SUBSTANCE: tire comprises at least two working plies (41, 43) and at least one ply of circumferential metal reinforcing elements (42). Said ply of circumferential metal reinforcing elements consists of at least one central part (422) and two axially outer parts (421). Central part reinforcing elements of at least one ply of circumferential reinforcing elements represent reinforcing elements cut to sections (6). Length of said sections makes smaller than 550 mm, distance (d) between sections exceeds 25 mm, length of sections is 1.1-13 times larger than the distance between the ends of two sequential sections. Reinforcing elements of two parts (421), external in axial direction, are continuous.

EFFECT: longer life, higher wear resistance.

16 cl, 5 dwg

 

The present invention relates to a tire with radial frame amplifier and, in particular, to the bus, intended for installation on vehicles that carry heavy loads and move at a steady speed, such as trucks, tractors, trailers or buses.

As a rule, in the tires of this type, which are designed for vehicles for the transport of heavy loads, frame amplifier attached on each side in the bead area, and on top of it in the radial direction placed the crown amplifier zone comprising at least two superimposed on each of the layers formed of threads or cords which are parallel in each layer and crossed from one layer to the next, forming angles in the interval between 10° and 45°, relative to the direction along the circumference. These layers, which form the operational amplifier, can also be optionally coated with at least one layer, known as a protective layer, which is formed of reinforcement elements, which are preferably metallic and tensile and are known as elastic elements. It may also contain a layer of metal cords or filaments with low elongation, forming an angle within the range from 45° to 90°, relative to the direction along okrugin the STI, this layer, known as triangulation layer is located in the radial direction between the frame amplifier and the first layer of the crown zone, known as the working crown layer zone, and the data layers are formed of parallel yarns or cords forming the corners at most equal to 45° in absolute value. Triangulation layer forms together with at least the specified working layer triangulation amplifier which is under the influence of various stresses deformed to a very small extent, while the triangulation layer plays an important role in the response to lateral compressive forces, the effects of which are all reinforcing members in the crown area of the tire.

In the case of tyres of vehicles for transportation of heavy loads usually there is only one protective layer, and the protective elements in most cases are oriented in the same direction and at the same angle in absolute value, and amplifying elements farthest from the center in the radial direction and, therefore, adjacent in the radial direction, the working layer. In the case of tyres for vehicles for construction, designed for driving on somewhat uneven ground, it is preferred that two protective layers, thus reinforcing elements, crossed from one the Loya to the next and internal reinforcing members in the radial direction of the protective layer overlap with inextensible reinforcement elements of the working layer, which is located outside in the radial direction towards the inside in the radial direction, a protective layer and is adjacent to the specified internal in the radial direction, and a protective layer.

It is assumed that the cords are stretched when said cords under the action of tensile forces, constituting 10% of the tearing efforts have deformation, which is at most 0.2 percent.

It is assumed that the cords are elastic when these cords under the action of tensile stress equal to tearing load, have a deformation comprising at least 3%, at the maximum of the tangent module of elasticity which is less than 150 GPA.

Circumferential reinforcing elements are reinforcing members, which form relative to the direction along the circumference angles being in the range of from 8°to -8° relative to 0°.

The direction along the circumference or the longitudinal direction of the tire is a direction corresponding to the periphery of the tire and defined by the direction in which the moving bus.

The transverse or axial direction of the tire parallel to the axis of rotation of the tire.

A radial direction is a direction which intersects the axis of rotation of the tire and perpendicular to it.

The axis of rotation of the tire is coboyos, around which it rotates during normal use.

Radial or meridional plane is a plane containing the axis of rotation of the tire.

Peripheral middle or Equatorial plane is a plane perpendicular to the axis of rotation of the tire and which divides the tire into two halves.

As the metal cords or filaments, the measurement tearing force (maximum load in N), ultimate tensile strength (in MPa) and relative elongation at break (total elongation in %) performed under the action of tensile load in accordance with ISO 6892, 1984.

Some modern tires, known as the "road" tires are designed for driving with high speeds in all longer trips due to improvements of the road network and the growth of the motorway network around the world. All the conditions under which you must run this tire will undoubtedly provide the opportunity to increase the distance that can be covered by bus, due to less tire wear, but the durability of the tire and, in particular, the durability of the amplifier crown area is reduced.

This is because there is voltage in the amplifier, crown area, in particular the shear stress between the layers of the crown zone, in combination with significant is the first increase of the working temperature on the ends of the layer of the crown zone, very short in the axial direction, and they cause the appearance of cracks and their propagation in rubber on these ends. The same problem occurs at the edges of the two layers of reinforcing elements with the specified layer does not have to be adjacent to the first radial direction.

To increase the longevity of the amplifier crown area of the tire under consideration in this application type have already been proposed decisions relating to the structure and quality of the layers and/or profiled elements formed of a rubber compound, which are located between the ends of the layers and/or around the ends of the layers and, more precisely, the ends of the layer, very short in the axial direction.

In French patent No. 1389428 to improve the resistance degradation of rubber mixes located near the edges of the amplifier crown area, it is recommended to use in combination with nizkointensivnym tread rubber profiled element which covers at least side and the boundary edges of the amplifier crown area and consists of discogitasting rubber mixture.

In French patent No. 2222232 to eliminate separation of the layers of the amplifier crown area proposed to cover the ends of the amplifier cushioning layer of rubber, the hardness of which is on a scale of a shore differs from the corresponding hardness of the tread, loc is defined over a specified amplifier, and greater than the hardness scale And Shor defined for profiled element of rubber mix, which is located between the edges of the crown amplifier zones and layers of the frame of the amplifier.

In the application for French patent No. 2728510 suggested that, on the one hand, between the frame steering and working layer frame of the amplifier, the closest in the radial direction to the axis of rotation, continuous in the axial direction of the layer, which is formed of inextensible metal cords forming an angle equal to at least 60°, relative to the direction along the circumference, and the width in the axial direction, at least equal to the defined in the axial direction width of the shortest working crown layer zone, and, on the other hand, between the two working crown layers of zone extra layer formed from metal elements, directed essentially parallel to the direction along the circumference.

Long implemented in the most severe conditions of operation of the tire, thus created, revealed the limits of the terms of the longevity of these tires.

To eliminate such drawbacks and increase the durability of the amplifier crown area of these tires were asked to provide a combination of at least one additional layer of reinforcement elements, su is estu parallel to the direction along the circumference, with the working crown layers zone. In the publication WO 99/24269, in particular, suggested that on each side of the Equatorial plane and in the zone, which is a direct continuation of an additional layer of reinforcement elements that are essentially parallel to the direction along the circumference in the axial direction, two working crown layer zone, formed of reinforcement elements, which are crossed from one layer to the next, were connected at some distance in the axial direction and then they were separated through the use of profiled elements of rubber mix for at least the remainder of the width common to the said two working layers.

The layer of circumferential reinforcing elements usually consists of at least one metal cord is wound with the formation of a coil, which is located at an angle amounting to less than 8°, relative to the direction along the circumference.

The results obtained in terms of durability and wear during long-term operation on roads with high speed, are satisfactory. However, it appears that the same vehicles/cars sometimes have to move on roads or highways without hudsonianus gravel cover, for example, to reach the construction site and the and the place of unloading. Movement in this area is slow, but the tires, in particular treads, are aggressive, for example, if there are stones, which greatly hinder performance from the point of view of the wear of the tires.

The objective of the invention is to develop tyres for vehicles for the transport of heavy loads, durability and wear characteristics which are stored for use on the roads and wear characteristics are improved for use on dirt roads.

This task is solved in accordance with the invention through the use of tires with radial frame amplifier that contains the power of the crown area, which is formed from at least two working crown layers, being composed of inextensible reinforcing elements, crossed from one layer to another and forming angles of between 10° to 45°, relative to the direction along the circumference, and which is closed in the radial direction of the protector, and the protector is connected to the two sides by means of two sidewalls, the crown amplifier zone contains at least one layer of circumferential metal reinforcing elements, the layer of circumferential reinforcing elements comprises at least one centralnotice and two parts, outside in the axial direction, and the reinforcing elements of the Central part, at least one layer of circumferential reinforcement elements are reinforcing members, which are cut into segments, with the length of the segments is less than 550 mm, the distance between the ends of two consecutive segments exceeds 25 mm, the length of the segments 1.1-13 times more than the distance between the ends of two consecutive sections, and reinforcing elements of the two parts, outside in the axial direction, are continuous.

Bus, thus defined, in accordance with the invention, maintains satisfactory characteristics when driving on high speed roads, and also has operational characteristics in respect of wear resistance and, more precisely, in relation to resistance to aggressive, which represents a marked improvement compared with the known tires.

The inventors were able to demonstrate that aggressive, due to the unpaved roads, significantly affect the Central part of the tread, this part definitely always in the most heavily exposed to.

The bus is determined in accordance with the invention, leads to an easing in the radial direction is the situation that part of the tire, which is Central in the axial direction, in particular due to the lower stiffness in the circumferential direction of this Central zone of the tire associated with the presence of circumferential reinforcement elements, which are cut. This easing in light of the obtained results leads to the absorption of corrosive effects on protector from obstacles, such as stones, available on the ground on which the vehicle is moving.

The inventors were also able to demonstrate that the reduction in stiffness of the Central zone of the tire creates the possibility of changing the shape of the contact patch where the tire is in contact with the ground, resulting in additional improved wear characteristics on asphalt roads. In particular, the amplifier crown area in accordance with the invention promotes the formation of a nearly rectangular footprint by limiting the extent to which the specified thumbprint is concave in the axial direction.

One preferred alternative embodiment of the invention is that the length of the segments is less than 300 mm and that the length of the segments is less than 6.5 times the distance between the ends of two consecutive segments.

It is also preferred in accordance with the invention the length of the cut is in is less than 260 mm and the length of the segments is less than 3.5 times the distance between the ends of two consecutive segments.

Also preferably, if the distance between the ends of two segments exceeds 35 mm

In accordance with one preferred embodiment of the invention, in particular to ensure minimal stiffness in the circumferential direction, the length of the segments is greater than 95 mm

For the same reason it is also preferable if the distance between the ends of two consecutive segments is less than 175 mm

The stiffness of the reinforcement elements, especially the Central part, should be high enough to give the bus a sufficient bond in the circumferential direction in this Central part, so that it could withstand the loads acting especially during inflation or when driving at high speed and to limit the elongation of the amplifier crown area in the circumferential direction.

These values also contribute to a good cohesion of the amplifier crown area of the tire Assembly as a whole, especially in its Central part. These values also contribute to the fact that the layer of circumferential reinforcing elements will contribute to the protection from exposure to these types. In particular, these values contribute to the achievement of a compromise combination of mitigation crown area, which allows the protector to absorb impact and protect the things function in the case if this tread is punctured.

In accordance with a preferred alternative embodiment of the invention the layer of circumferential reinforcing elements has a width in the axial direction of more than 0.5×S.

S - the maximum width of the tire in the axial direction when the tire mounted on the rim, intended for its operation, and inflated to the recommended her pressure.

Defined in the axial direction of the width of the layers of reinforcement elements measured in the cross section of the tire, in this case, therefore, the tire is deflated.

In accordance with one preferred alternative embodiment of the invention as defined in the axial direction width of the Central part of the layer of circumferential reinforcing elements exceeds 0.15×S and is less than 0.5×S.

It is also preferred in accordance with the invention, defined in the axial direction width of each of the outside in the axial direction of the parts of the layer of circumferential reinforcing elements is less than 0.45×S.

In accordance with an alternative embodiment of the invention transitional zone between the Central part and the parts outside in the axial direction, is preferably such that these transitional zones contain most meta is symbolic amplifying element, when measured in the axial direction width of these transition zones is equal to at least 1.5 mm

Such transitional zones, in particular, provide the ability to limit the appearance of zones of excessive tension in located closest to the center in the axial direction Corday those parts of the layer of circumferential reinforcement elements, which are external in the axial direction, in areas facing the ends of those portions of the Central part, which are the most distant from the center in the axial direction.

In accordance with this embodiment measured in the axial direction width of these transitional zones preferably equal to at most 7 mm

In accordance with this embodiment, when the transition areas contain metal reinforcing element, this element forms an angle relative to the direction along the circumference, which preferably is in the range from 0.2 to 4°.

It is also preferred in accordance with this embodiment, particularly when the tire is designed to be installed on the managed bridge vehicle and its protector includes at least one circumferential edge, the lateral edge data transition zones removed from the designated in the axial direction of the ends on the surface protect the Republic of Armenia in the area of the specified edge to be measured in an axial direction a distance of at least 4 mm, When one edge of the ribs is made rounded ends in the axial direction are determined by the intersection of the direction of inclination of the grooves formed by the edge and tangent to the upper surface of the ribs.

In accordance with other alternative variants of the invention, the transition zone is preferably between the Central part and the parts outside in the axial direction, so that these transitional zones will have stiffness in the circumferential direction, which are intermediate between the corresponding stiffness of the Central part and the corresponding rigidity of the parts, outside in the axial direction. These transition zones preferably have a small width in the axial direction and form any gradual transition between the values defined in the circumferential direction rigidity of the Central part and parts, outside in the axial direction. The width of the specified transition zone is preferably in the range between the value 1.25 times the interval at which the circumferential reinforcing elements embedded in parts, outside in the axial direction, and magnitude 3.75 times greater than the specified interval.

The value provided for in of the Britanie, the interval in part of the layer of circumferential reinforcing elements is the distance between two consecutive amplification elements. It is measured between the longitudinal axes of these reinforcing elements in the direction perpendicular to at least one of these longitudinal axes. Therefore, it is measured essentially in the axial direction.

The gradient of stiffness at the transition from parts, outside in the axial direction, to the Central part preferably get through transition zones, consisting of circumferential reinforcement elements, which are cut to form segments, the length of which is greater than the length of the segments in the Central part, and/or due to the fact that the distance between the ends of two consecutive segments is less than the distance between two line segments in the Central part.

In accordance with the first embodiment, the length of the segments in the circumferential direction is also preferably decreases from defined in the axial direction of the outer edge of the transition zone towards its edge, the inner axial direction.

In accordance with the second embodiment, the distance between the ends of two consecutive segments increases from defined in the axial direction, the outer edge of the plumage is one area towards the edge of it, internal in the axial direction.

In accordance with a third embodiment of the invention the reduction defined in the circumferential direction of the length of the segments is combined with increasing distance between the ends of two consecutive line segments from the edge of the transition zone, outside in the axial direction, toward its edge, the inner axial direction.

In accordance with an alternative embodiment of the invention provides/provided by reducing the length of the segments defined in the circumferential direction, and/or increase the distance between the ends of two consecutive sections from the edges of the Central portion toward its center.

In accordance with the invention also provides the combination of two consecutive transitional zones provided between the Central part and the parts outside in the axial direction, the first transition zone adjacent to the part, outside in the axial direction, includes a metal reinforcing element similar to that described previously, and the second transition zone adjacent to the Central portion has a stiffness in the circumferential direction, which are intermediate between the corresponding values in the Central part and in parts, exterior in acceleratable, and, in particular, obtained by reducing the length of the segments defined in the circumferential direction, and/or by increasing the distance between the ends of two consecutive sections from defined in the axial direction of the outer edge of the specified second transition zone to the edge, the inner axial direction.

In other alternative embodiments are also provided for the laying of circumferential reinforcement elements at an interval that varies in the Central part and in parts, outside in the axial direction. In order to contribute to more low stiffness, defined in the circumferential direction, in the Central part of the layer of circumferential reinforcing elements, the interval is more preferably in a specified Central part. Its value is preferably not more than 1.5 times the spacing in parts, outside in the axial direction, and more preferably not more than 1.25 times the spacing in parts, outside in the axial direction.

In the case when the interval is different in parts, outside in the axial direction, and in the Central part and the layer of circumferential reinforcing elements contains transitional zones, it is also preferred that the interval at which will be laid circumferential reinforcing elements per the transitional zone, had a magnitude in the range between the value of the interval in part, outside in the axial direction, and the spacing in the Central part.

In one preferred embodiment of the invention, two successive or adjacent in the axial direction of the circumferential reinforcement element in the Central part and possibly in transition zones, which consist of reinforcing elements, which are cut to form segments that do not have areas of cutting, which are opposite each other in axial direction. More precisely, the area of incisions between the segments preferably are not next to each other in axial direction and, therefore, shifted relative to each other in the circumferential direction.

In accordance with this embodiment the ends of two adjacent segments is preferably located at such a distance from each other in the longitudinal direction that is greater than 0.1 of the length of that segment, which has the shortest length, measured in the longitudinal direction.

In accordance with the invention also preferably provided that at least one layer constituting the amplifier crown area, will be in the radial direction under the farthest from the center in the axial direction "edge" or block tread with rodolniy focus. This variant implementation, as mentioned earlier, provides an increase in the rigidity of the specified block of the tread. Also preferably, if the layer of circumferential reinforcing elements will be in the radial direction under the farthest from the center in the axial direction "edge" or block tread with a longitudinal main orientation.

In accordance with one preferred embodiment of the invention, at least two working crown layer zones have different widths in the axial direction, with the difference determined in the axial direction of the width of the working crown layer zone, the widest in the axial direction, and is defined in the axial direction of the width of the working layer of the crown area, very narrow in the axial direction, is in the range from 10 to 30 mm

Also preferably, if the widest in the axial direction, the working crown layer zone is located radially inside with respect to the other working crown layers of the zone.

In accordance with one preferred embodiment of the invention, the layer of circumferential reinforcing elements is located radially between two working crown layers of the zone.

It is also preferred in accordance with the invention defined in the axial napravleniya working crown layers of the zone, located in the radial direction near the layer of circumferential reinforcing elements, more defined in the axial direction of the width of the specified layer of circumferential reinforcement elements, and these working crown layers of the zone adjacent to the layer of circumferential reinforcement elements on each side of the Equatorial plane and in the zone, which is a direct continuation with respect to the layer of circumferential reinforcing elements in the axial direction, is preferably connected at a certain width in the axial direction and then further separated profiled elements of rubber mix, at least on the remainder of the width common to the said two working layers.

The value specified in the invention, the layers that are connected to represent the layers corresponding reinforcing members which are located at such distance from each other in the radial direction, which is at most 1.5 mm, with specified rubber thickness measured in the radial direction respectively between the upper and lower forming these reinforcing elements.

The presence of such connections between the working layers of the crown zone, adjacent to the layer of circumferential reinforcing elements, allows to reduce the tensile stress acting on the Yes is inie from the center in the axial direction, circumferential elements closest to the connection.

The thickness of the separating profiled elements between the working layers, measured at the ends of the narrow working layer will be at least equal to two millimeters, and preferably is more than 2.5 mm

In accordance with the first alternative embodiment of the invention, the circumferential reinforcing elements of the Central part, at least one layer of circumferential reinforcement elements are inextensible metal reinforcing members. This alternative embodiment of the invention is particularly preferred from an economic point of view, thus amplifying elements of this type are inexpensive.

In accordance with another alternative embodiment of the invention, the circumferential reinforcing elements of the Central part, at least one layer of circumferential reinforcement elements are elastic/elastic metal reinforcing members. Such an alternative embodiment of the invention may have the advantage that facilitates formation of a layer of circumferential reinforcement elements, because the same reinforcing members can be used for the three parts of the specified layer of circumferential reinforcing elements in axial load is flax direction. The system is designed for cutting of the reinforcement elements is driven only for the Central part in the laying of circumferential reinforcing elements.

In accordance with one preferred embodiment of the invention, at least the amplifying elements of the two parts, outside in the axial direction, at least one layer of circumferential reinforcing elements are metal reinforcing elements having a secant modulus at a relative elongation of 0.7%, which is in the range between 10 and 120 GPA and a maximum tangent modulus of less than 150 GPA.

In accordance with the preferred embodiment secant modulus of the reinforcement elements at a relative elongation of 0.7% is less than 100 GPA, and greater than 20 GPA, preferably is in the range from 30 to 90 GPA, and even more preferably less than 80 GPA.

Also preferably, if the maximum tangent modulus of elasticity of the reinforcement elements is less than 130 GPA, and even more preferably less than 120 GPA.

The values of the modules above, determined on a curve of tensile stress on the relative elongation obtained in the preliminary tension of 20 MPa relative to the cross-sectional area of the metal reinforcement is lament, when this tensile stress corresponds to the measured tension divided by the cross sectional area of the metal reinforcing element.

The value of modules for the same amplifying elements can be defined on a curve of tensile stress on the relative elongation, which is defined in the preliminary tension of 10 MPa, obtained by dividing by the total cross-sectional area of the reinforcement element, while tensile stress corresponds to the measured tension, divided by the total cross-sectional area of the reinforcement element. The total cross-sectional area of the reinforcement member is a cross-sectional area of the composite element formed of metal and rubber, this rubber is more than just enters the amplifying element during phase vulcanization of the tire.

Using this composition, related to the total cross-sectional area of the reinforcement element, you can specify that the reinforcing members parts, outside in the axial direction, and the Central part, at least one layer of circumferential reinforcing elements are metal reinforcing elements with the clipping module with a relative elongation of 0.7% in the range from 5 to 60 GPA, and the maximum tangential the m modulus, constituting less than 75 GPA.

In accordance with the preferred embodiment secant modulus of the reinforcement elements at a relative elongation of 0.7% is less than 50 HPa and above 10 HPa, preferably is in the range from 15 to 45 GPA, and even more preferably is less than 40 GPA.

Also preferably, if the maximum tangent modulus of elasticity of the reinforcement elements is less than 65 GPA, and even more preferably less than 60 GPA.

In accordance with the preferred embodiment, at least the amplifying elements of the two parts, outside in the axial direction, at least one layer of circumferential reinforcing elements are metal reinforcing elements having a curve strain stress tensile, which has gentle gradients with small movements and essentially constant and sharp/steep gradient for large movements. Such reinforcing elements of the additional layer is usually called "mymodulename" elements.

In accordance with a preferred embodiment of the invention is constant and sharp gradient occurs when the relative elongation in the range from 0.1% and 0.5%.

Various characteristics of the reinforcement elements, which were listed the above, defined for amplifying elements, which were extracted from the tires.

Amplifying elements, more precisely suitable for the formation of at least one layer of circumferential reinforcement elements according to the invention are, for example, the elements in the collection with the formula 21.23, the design of which is such 3×(0,26+6×0,23) 4,4/6,6 SS; this mnogoplodnyi rope consists of 21 filament with the formula 3×(1+6) with three strands that are twisted together and each of which consists of seven threads, with one thread forms a Central core with a diameter equal 26/100 mm, and six wound filaments with diameter equal 23/100 mm. Such cord has a secant modulus at a relative elongation of 0.7%, amounting to 45 GPA and a maximum tangent modulus of elasticity, amounting to 98 GPA, while the values defined on the curve of the dependence of the tension on the relative elongation, which was obtained during the preliminary tension of 20 MPa, when divided by the cross-sectional area of the metal reinforcing member, tensile stress corresponds to the measured tension divided by the cross sectional area of the metal reinforcing element. On a curve of tensile stress on the relative elongation obtained in the preliminary tension of 10 MPa, when divided by the total area of operacneho cross-section of the reinforcement element, tensile stress corresponds to the measured tension, divided by the total cross-sectional area of the reinforcement element, with this cord formula 21.23 has a secant modulus at a relative elongation of 0.7%, amounting to 23 GPA and a maximum tangent modulus of elasticity, amounting to 49 GPA.

Similarly, another example of the reinforcement elements is an element in the collection with the formula 21.28, the construction of which is such 3×(0,32+6×0,28) 6,2/9,3 SS. This cord has a secant modulus at a relative elongation of 0.7%, amounting to 56 GPA and a maximum tangent modulus of elasticity average of 102 HPa, both these values are defined on the curve of tensile stress on the relative elongation, which was obtained during the preliminary tension of 20 MPa, when divided by the cross-sectional area of the metal reinforcing member, tensile stress corresponds to the measured tension divided by the cross sectional area of the metal reinforcing element. On a curve of tensile stress on the relative elongation obtained in the preliminary tension of 10 MPa, when divided by the total cross-sectional area of the reinforcement element, while tensile stress corresponds to the measured tension, divided by the total the second cross-sectional area of the reinforcement element, this cord formula 21.28 has a secant modulus at a relative elongation of 0.7%, amounting to 27 GPA and a maximum tangent modulus of elasticity, amounting to 49 GPA.

The use of such reinforcing elements in at least two parts, outside in the axial direction, at least one layer of circumferential reinforcing elements, in particular, provides the ability to maintain sufficient rigidity of the layer even after operations make a given shape and vulcanization, which are carried out under normal manufacturing methods.

Metal elements preferably are steel cords.

The invention also preferably provides a reduction of tensile stresses acting on the most distant from the center in the axial direction, circumferential elements, and the angle formed by the reinforcing elements of the working crown layers of the zone relative to the direction along the circumference is less than 30° and preferably less than 25°.

In accordance with another preferred alternative embodiment of the invention the working crown layers of zones contain reinforcing elements, which are crossed from one layer to another and form angles relative to the direction along the circumference, which can vary in axial on the managing, these angles are more defined in the axial direction of the outer edges of the layers of reinforcement elements compared to the angles that these elements form a when measured in the circumferential mid-plane. Such a variant embodiment of the invention creates the possibility of increasing stiffness, defined in the direction along the circumference, in certain areas while reducing the corresponding stiffness in other areas, in particular to reduce the compression ratio, which is subjected to frame the amplifier.

In one preferred embodiment, the invention also provides that the amplifier crown zones are expanded in the radial direction from the outside, at least one additional layer, known as the protective layer, the reinforcement elements, the so-called elastic/elastic reinforcement elements, which are directed relative to the direction along the circumference at an angle in the range from 10° to 45° and having the same direction as the angle formed by the inextensible elements of the working layer adjacent to them in the radial direction.

The protective layer may have a width in the axial direction which is less than defined in the axial direction of the width of the narrowest working ply. The specified protective layer may also have a width in acceleratable, which is more defined in the axial direction of the width of the narrowest working layer, so that it will overlap the sides of the narrow working layer, and in the case when the layer is in the radial direction from the top, is the most narrow, it will be connected in the area, representing the continuation of an additional amplifier in the axial direction, with the widest working crown layer area at a certain width in the axial direction, further, in the axial direction from the outside, it will be separated from the specified widest working layer of profiled elements with thickness, component, at least 2 mm In the above case, the protective layer formed from elastic/elastic reinforcement elements may be, on the one hand, it is separated from the edges of the specified narrow working layer of profiled elements with a thickness that is substantially less than the thickness of the profiled elements, which divide the edges of the two working layers, and, on the other hand, may have a width in the axial direction, which more or less defined in the axial direction of the width of the widest layer of the crown area.

In accordance with any of the embodiments of the invention mentioned above, the amplifier crown area can be further addition is - in the radial direction between inside frame steering and interior in the radial direction, working layer closest to the specified frame to the amplifier - triangulation layer of inextensible metal reinforcing elements made of steel, which form an angle relative to the direction along the circumference which is greater than 45° and has the same direction as the angle formed by the reinforcing elements of the layer nearest to the radial direction to frame the amplifier.

Other details and preferred features of the invention will become clear from the description given by way of example of embodiments of the invention described with reference to Fig.1-5, in which:

Fig.1 is a longitudinal schematic view of a tire in accordance with the invention;

Fig.2 is a schematic representation of one layer of circumferential reinforcing elements tires with Fig.1;

Fig.3 is a schematic representation of one layer of circumferential reinforcing elements in accordance with the second embodiment of the invention;

Fig.4 is a schematic representation of one layer of circumferential reinforcing elements in accordance with a third embodiment of the invention; and

Fig.5 is a schematic longitudinal view of a tire in accordance with an alternative embodiment of the invention.

In order to facilitate the Oia their understanding of the drawings are not drawn to scale. The drawings show only half of the bus that continues symmetrically on the other side of the axis XX', which displays "ring"the average plane, or Equatorial plane of the tire.

It is shown in Fig.1, the tire 1 with the size 455/45 R 22,5 has a ratio H/S profile height and width, amounting to 0.45, while H is the height of the tire 1 on its mounting rim and S be its maximum width in the axial direction. The tire 1 has a radial frame amplifier 2, mounted in the two sides, not shown in Fig.1. Framed amplifier formed of a single layer of metal cords. Frame amplifier 2 is surrounded on top by crown amplifier 4 zones formed in the radial direction of the following elements, listed in order from the inside to the outside:

- layer of reinforcing elements 45, known as triangulation layer formed of inextensible Neoplatonic metal cords 9.28, which are continuous throughout the width of the layer and is directed at an angle of 50°;

- from the first working layer 41 formed of inextensible Neoplatonic metal cords 11.35, which are continuous throughout the width of the layer and is directed at an angle of 18°;

- layer of circumferential reinforcing elements 42 formed of metal cords 21×28 "bimodule" type, consisting of three parts, with d the installed part is a two part 421, outside in the axial direction, and the Central part 422;

from the second working layer 43 formed of inextensible Neoplatonic metal cords 11.35, which are continuous throughout the width of the layer, which are directed at an angle equal to 18°, and which overlap with steel cord layer 41;

from the protective layer 44 formed of an elastic metal cords h directed at an angle of 18° in the same direction as the reinforcing elements of the working layer 43.

The amplifier crown area is closed from above by the protector 6.

Maximum width S in the axial direction is equal to 458 mm

The width of the L45triangulation layer 45 in the axial direction is equal to 382 mm

The width of the L41the first working layer 41 in the axial direction is equal to 404 mm

The width of the L43the second working layer 38 in the axial direction is equal to 380 mm the difference between the widths of the L41and L43equal to 24 mm

As defined in the axial direction of the width of the L42the layer of circumferential reinforcing elements 42, then this value is equal to 304 mm Outside in the axial direction portion 421 has a width of L421constituting 61 mm, which, consequently, is less than 45% of the S.

The width of the L422the Central part is equal to 182 mm

The last layer 44 of the crown zone, known as the protective layer, and EET width L 44equal to 338 mm

Fig.2 illustrates a first variant implementation of the layer of circumferential reinforcing elements 42 in accordance with the invention, corresponding to Fig.1. As mentioned previously, this layer 42 is composed of a Central part 422 and two parts 421, outside in the axial direction.

Circumferential reinforcing elements 5 arranged with a constant interval R, amounting to 2.3 mm, all defined in an axial direction width of the layer of circumferential reinforcing elements 42.

In the Central part of circumferential reinforcing elements is cut to form segments 6, having a length equal to 101 mm Two segments separated by a gap 7, which corresponds to the distance d, the distance d measured between the ends of the two sections 6, following each other in the circumferential direction, is equal to 65 mm

Layer 42, thus obtained, provides the possibility of achieving a lower stiffness, defined in the circumferential direction, in the Central part 422 compared to defined in the circumferential direction rigidity of the parts 421, outside in the axial direction.

Fig.3 illustrates a second variant implementation of the layer of circumferential reinforcing elements 42 in accordance with the invention. In addition to the Central part 422 and parts 421, outside in the axial direction, the layer 42 contains two intermediate the ons 423, located in the axial direction between the Central part 422 and each of the parts 421, outside in the axial direction.

The width of the L423in the axial direction equal to 4.5 mm, Defined in an axial direction width L422the Central part is equal to 173 mm, and defined in an axial direction width L421each part 421, outside in the axial direction equal to 61 mm

The length of the segments 6 and the magnitude of the gaps 7 in the Central part 422 is identical to the corresponding values of c Fig.2.

Segments 8 in the intermediate zones 423 have a length l423equal to 132 mm, and two segments 8 are separated by a gap 9, the value of which is determined by the distance of d423measured between the ends of two pieces of 8, following each other in the circumferential direction equal to 35 mm

These values show that the segments 8 of the intermediate zones 423 have a greater length than the segments 6 in the Central part 422, and separated by gaps, which have a shorter length compared to the length of the gaps in the Central part 422. Thus, defined in the circumferential direction rigidity in these intermediate zones will be higher than the corresponding stiffness of the Central part. Thus, this provides a more gradual change in stiffness, defined in the circumferential direction, in the axial direction SL is I circumferential reinforcing elements 42.

Fig.4 illustrates a third alternative implementation of the layer of circumferential reinforcing elements 42 in accordance with the invention. As in the case of variant c of Fig.3, it contains two of the intermediate zone 423, located in the axial direction between the Central part 422 and each of the parts 421, outside in the axial direction.

The width L423, L422and L421defined in the axial direction, is identical to the corresponding values in option c of Fig.3.

The length of the segments 6 and the length of the gaps 7 in the Central part 422 is identical to the corresponding lengths in variants c Fig.2 and 3.

The length of the segments 8 and the length of the gap 9 in the intermediate zones 423 identical lengths in option c of Fig.3.

The interval R421, which laid circumferential reinforcing members 5 parts 421, outside in the axial direction, is identical to the interval in option c of Fig.1 and equal to 2.3 mm

Circumferential reinforcing elements that were cut and which form segments 6 in the Central part, arranged with an interval of P422equal to 2.9 mm This larger interval at which they are placed in the Central part, plays a role in the reduction defined in the circumferential direction rigidity of the specified Central part 422 compared to parts 421, outside in the axial direction.

The interval at which laid allowed the data circumferential reinforcing members, which form segments 8 in the intermediate zones 423, equal to 2.5 mm, the Interval at which laid circumferential reinforcing elements in the intermediate zone, is a value intermediate between the corresponding interval in parts 421, outside in the axial direction, and the corresponding interval in the Central part 422. These values contribute to the gradual changes of stiffness, defined in the circumferential direction, in the axial direction of the layer of circumferential reinforcing elements 42.

In accordance with other alternatives of the invention the spacing in the intermediate zones 423 may be a value that is identical to the spacing in the Central part, or the alternative value of the interval in part, or parts, outside in the axial direction, only the lengths of segments and the length of the gaps between the line segments will change gradually.

Other alternatives can also provide a gradual change interval in the intermediate zones or in combination with circumferential reinforcement elements, which are continuous, as in parts 421, outside in the axial direction, or amplifying elements, which were cut into segments and the lengths of segments and the length of the gaps between segments of identical length in the centre of the real part 422.

It is shown in Fig.5 bus 1 is different from the tire shown in Fig.1, so that the two working layers 41 and 43 on each side of the Equatorial plane and in the zone, which is a continuation of the layer of circumferential reinforcing elements 42 in the axial direction, is connected to the width l in the axial direction: the cords of the first working layer 41 and the cords of the second working layer 43 defined in the axial direction of the width l of the connection of the two layers are separated in the radial direction from each other by a layer of rubber, the thickness of which is minimal and corresponds to twice the thickness of the rubber calendarhome layer Neoplatonic metal cords 11.35 which comprise each working layer 41, 43, namely 0,8 mm On the remainder of the width common to the two working layers, two working layers 41, 43 are separated rubber profiled element, not shown in the figure, the thickness of the specified profile element increases from defined in the axial direction of the end zone connection towards the end of the narrowest working ply. The specified profile element is preferably wide enough so that it overlaps in the radial direction of the end of the widest working layer 41, which in this case is a functional layer that is closest to the frame amplifier in a radial directed the I.

Tests were performed for tires manufactured according to the invention in accordance with the image from Fig.1, and the test results were compared with the control bus, which was identical but was made with a conventional configuration.

This control bus contains the layer of circumferential reinforcing elements consisting of the same cords, arranged with the same interval and have no part with items that have been cut to form segments. Thus, defined in the circumferential direction rigidity of the layer of reinforcing elements will be constant throughout its width in the axial direction.

The first tests on the durability/endurance were performed by setting each of the tires on identical vehicles/cars and ensure the movement of each vehicle in a straight line, the tires were subjected to loads that exceed the rated load for acceleration tests of this type.

Vehicle "match" the load on the tire constituting 4000 kg

Other tests on the durability/endurance were conducted on the test bench, which provided the load is applied to the tire and the creation of the angle of rotation of the tyre. Tests were carried out on the tires according to the invention with the load and the angle is Vorota, which were identical to those used for the control tire.

The test results thus showed that the distances covered in each of these tests were essentially the same for tires according to the invention and for a control tire. Therefore, it is obvious that the tire according to the invention have performance characteristics that are essentially equivalent from the point of view of durability of the control tire.

In the end, there were additional operational tests on the unpaved roads that have a raised areas that mimic the presence of stones, which are particularly harmful to the tyre tread.

The results of this last series of tests showed that after identical of the distances covered tire according to the invention showed less serious injuries.

The invention described above, particularly with reference to the example embodiments of, should not be understood as limited data options for implementation. For example, the layer of circumferential reinforcing elements, while still within the scope of the invention may consist of more than five parts to ensure a more gradual changes in the stringency, as defined in the circumferential direction.

1. The radial is framed by the amplifier, contains the power of the crown area, which is formed from at least two working crown layers, being composed of inextensible reinforcing elements, crossed from one layer to another and forming angles of between 10° to 45°, relative to the direction along the circumference, and which is closed in the radial direction of the protector, and the protector is connected to the two sides by means of two sidewalls, the crown amplifier zone contains at least one layer of circumferential metal reinforcing elements, wherein the layer of circumferential reinforcing elements consists of at least one Central part and two parts, outside in the axial direction, thus reinforcing elements of the Central part, at least one layer of circumferential reinforcement elements are reinforcing members, which are cut into segments, and the length of the segments is less than 550 mm, the distance between the ends of two consecutive segments exceeds 25 mm, and the length of the segments 1.1-13 times more than the distance between the ends of two consecutive sections, thus reinforcing elements of the two parts, outside in the axial direction, are continuous.

2. Bus under item 1, characterized in that the length of the segments is less than 300 mm, when the eating lengths less than 6.5 times the distance between the ends of two consecutive segments.

3. Bus under item 1 or 2, characterized in that the length of the segments is greater than 95 mm

4. Bus under item 1 or 2, characterized in that the distance between the ends of two consecutive segments is less than 175 mm

5. Bus under item 1 or 2, characterized in that defined in the axial direction width of the Central part of the layer of circumferential reinforcing elements exceeds 0.15×S and is less than 0.5×S.

6. Bus under item 1 or 2, characterized in that defined in the axial direction width of each of the outside in the axial direction of the parts of the layer of circumferential reinforcing elements is less than 0.45×S.

7. Bus under item 1 or 2, characterized in that the layer of circumferential reinforcement elements in the transition zone between the Central part and the parts outside in the axial direction, and the transitional zones contain, at most, a metal reinforcing member, measured in the axial direction width of the transition zone is at least 1.5 mm

8. Bus under item 1 or 2, characterized in that the layer of circumferential reinforcement elements in the transition zone between the Central part and the parts outside in the axial direction, and is defined in the circumferential direction length of the segments decreases from the edge of the transition zone, outside in the axial direction, toward its edge, inside the mu in the axial direction, and/or the distance between the ends of two consecutive segments increases from the edge of the transition zone, outside in the axial direction, toward its edge, the inner axial direction.

9. Bus under item 1 or 2, characterized in that the layer of circumferential reinforcement elements in the transition zone between the Central part and the parts outside in the axial direction, and thethe interval between the circumferential reinforcing elements in the Central part of a longer interval between them in parts, outside in the axial direction, the interval in the transition zone has a value in the range between interval between the circumferential reinforcing elements in parts, outside in the axial direction, and an interval between the circumferential reinforcing elements in the Central part.

10. Bus under item 1 or 2, characterized in that two successive or adjacent in the axial direction, circumferential reinforcement element, which consist of reinforcing elements, which are cut to form segments that do not have areas of cross-section which are opposite each other in axial direction.

11. Bus under item 10, characterized in that the ends of two adjacent segments spaced from each other in the longitudinal direction, and this distance exceeds the amount of costs the General 0.1 of the length of that segment, which has the shortest length, measured in the longitudinal direction.

12. Bus under item 1 or 2, characterized in that the layer of circumferential reinforcing elements is located radially between two working crown layers of the zone.

13. Bus under item 1 or 2, characterized in that the reinforcing elements of the two parts, outside in the axial direction, at least one layer of circumferential reinforcing elements are metal reinforcing elements having a secant modulus at a relative elongation of 0.7% in the range from 10 to 120 GPA and a maximum tangent modulus of less than 150 GPA.

14. Bus under item 1 or 2, characterized in that the reinforcing elements of at least one layer of circumferential reinforcing elements are metal reinforcing elements having a curve strain stress tensile, which has gentle gradients with small movements and essentially constant and sharp/steep gradient at large extensions.

15. Bus under item 1 or 2, characterized in that the amplifier crown zones are expanded in the radial direction from the outside, at least one additional layer, known as the protective layer, the reinforcement elements, the so-called elastic/elastic reinforcement elements, which upravleniekrovlia direction along the circumference at an angle, in the range from 10° to 45°, and in the same direction as the angle formed by the inextensible elements of the working layer adjacent to them in the radial direction.

16. Bus under item 1 or 2, characterized in that the amplifier crown zone further comprises a triangulation layer formed from a metal reinforcing elements, which form angles greater than 45°, relative to the direction along the circumference.



 

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