Pneumatic type for heavy vehicle

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

 

The present invention relates to a pneumatic tire with a radial frame reinforcement anchored in each side, at least on one side of the ring and containing a valve of crest, consisting of at least two so-called working layers superimposed on each other in the radial direction and formed reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction of the pneumatic tire angle, which may be in the range from 10 to 35° in absolute value.

In many cases, the applicant has found that some aspects of quality considered pneumatic tires, in particular, used for heavy-duty wheeled vehicles can be improved due to the presence in the valve of the crest of the additional layer is radially located between the said working layers of the ridge and formed from metal elements, directed essentially parallel to the regional trend.

In the application France 2 744 954 for lowering the operating temperature of the pneumatic tires of a vehicle as a cost-effective solution is to use an additional layer of circular reinforcement elements having an axial width at least aunuu 1,05 width of the widest working layer, while amplifying elements of said additional layer have a diameter greater than the diameter of the elements of the working layers.

As part of this additional layer may consist of solid steel cord filaments, called the semi-stretched, that is characterized by an elongation at break greater than 2%. These cord thread allow you to get the stiffness level, providing uniform distribution around the circumference of the tension between the working layers of the ridge and additional layers. Mentioned cord thread preferably called "bimodule", i.e. they are characterized by a curve that expresses the tensile strength, depending on the relative elongation and contains gentle slope for small values of elongation and, in fact, continuous and steep slope for higher values of elongation. Lower the module until vulcanization of the values of elongation less than 2% increases regional deployment of an additional layer during vulcanization of pneumatic tires.

The additional layer may be formed of steel cord filaments oriented in the circumferential direction, cut to length, much smaller circumferential length of the layer, while the gaps between lines are shifted in the axial direction relative to each other. This option is the implementation of what is a simple way of giving an additional layer of any desired hardness.

The choice of elastic or split cord yarns to gain additional layer does not increase the fatigue strength of the mentioned layer or due to reduction efforts rupture of elastic cord yarns or due to the presence of stress concentrations in a mixture of calendering split cord threads.

In the international application WO 99/24270 noted that to increase the resistance to delamination between the frame layer and the reinforcement of the ridge, between the layers of the ridge and fatigue strength of circular reinforcement elements of the additional layer is possible through the use of continuous in the circumferential direction and corrugated in a plane layer of metal elements as reinforcement elements of the additional layer, these wavy elements parallel to each other in phase and oriented in the circumferential direction so that the ratio of α/λ between amplitude α and wavelength λ decreases with distance from the center to the edges mentioned layer and becomes minimum at the edges.

From the above two documents implies that the amplifying elements of said additional layer are preferably steel cord filaments of larger diameter than the reinforcing members of the two working layers adjacent in the radial direction. If the structure of opisannaya the first-mentioned document (using the semi-stretched or split amplifying elements), affects the tensile strength and reduces the durability of the additional layer, described in the second above-mentioned document structure (corrugated reinforcing members is difficult to manufacture and, in particular, leads to increased production costs, as said additional layer is produced by spiral winding of the reinforcement element around the appropriate form up to obtain the total width of the layer.

The present invention is to remedy these disadvantages and to develop solutions to improve the delamination resistance and wear resistance in comparison with the mentioned solutions using cutting reinforcing members, and at the same time addressing the problems of manufacture and to reduce production costs, compared with the solution in which use thick wavy elements.

Pneumatic tire in accordance with the present invention includes a radial frame fittings with an overlay in the radial direction of the armature of crest, consisting of at least two working layers of the ridge formed of metal reinforcing elements, crossed from one layer to the next, forming with the circumferential direction angles in the range from 10 to 35°and at least one additional fittings that is, formed metal reinforcing elements oriented in the circumferential direction, with said additional valve to perform at least two layers of metal elements of small diameter not exceeding 0,6 mm

Circumferential direction of the pneumatic tire or longitudinal direction is a direction corresponding to the periphery of the pneumatic tire and defined by the direction of rolling pneumatic tires.

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

Additional reinforcement may consist at least of two layers of elements of small diameter, with each layer contains two edges that overlap each other in the circumferential direction. It can also be done by winding a single layer with the formation of at least two layers, at this time, the valve has only two free edges at the beginning and at the end of winding. Free edges represent specific points or areas that are in accordance with the present invention do not lead to uneven wear of the pneumatic tire through the diameter of the reinforcement elements.

Preferably radially inside and/or outside of the ends of the layers of reinforcement elements of small diameter additional reinforcement is placed PLA is you rubber compound on the axial width of the above-mentioned layers of reinforcing elements. These layers of rubber compounds allow to separate from each other, the said ends of the layers in a direction radial with respect to their contact.

The advantage of performing additional reinforcement of one or more layers, having a width of reinforcement is the method of placing the said armature in a few turns. In terms of performance and, consequently, the efficiency was found that the manufacture of pneumatic tires in accordance with the present invention is simpler and faster than the manufacture of tyres, in which use the laying of the strands or strips by spiral winding. In addition, in the pneumatic tire in accordance with the present invention the amplifying elements of the circular reinforcement is placed under absolutely zero angle relative to the circumferential direction, and not insignificant, but still greater than 0° angle.

Most appropriate for carrying out the invention the amplifying elements are assemblies of steel SHT (Super High Tensile) type HP, where n is from 2 to 5, and the diameter of the filaments is in the range from 12/100 to 30/100 mm and preferably greater than 15/100 mm, it is preferable reinforcing members must be strands consisting of n monofilaments, having previously listed characteristics.

As in the case of any reinforcement of circular elements, to ensure the ecene the possibility of manufacturing a question pneumatic tires the easiest way and at the lowest production costs, with little effort tensile force parallel to the direction of the reinforcement elements, the valve in accordance with the present invention must have some elongation necessary to enable the torsion deployment valve crest during operations of manufacturing, finishing and curing pneumatic tires.

In this regard, according to the first variant embodiment of the invention additional fittings are made of fractionated amplifying elements, that is cut into segments or groups of segments with a length of less circumferential length of the layer or layer, while the gaps between lines or sets of segments are shifted in the circumferential direction relative to each other.

According to a preferred variant implementation reinforcing members are cut at 3-12 pieces in one turn.

According to this variant embodiment of the invention, since the laying of the reinforcement elements are in two dimensions, of which the first is the axial direction, and the second radial direction, the area in which reinforcing members are missing, better distributed than in the case when the strips or filaments are distributed in only one layer. More precisely, on the same axial or longitudinal line of the stump is automatic tire is smaller zones without reinforcing elements.

According to the second variant of implementation of the present invention the length of the reinforcement elements of the additional reinforcement of sales in the plane of each layer exceeds 0-3% of the length of the laying of the above elements. In other words, the residual elongation of the pneumatic tire is less than 3%, while the residual elongation is the ratio of the difference between the length of the reinforcement elements on the turnover and deployment of the styling or the length of the turnover referred to deployment installation. This difference between the length of the reinforcement elements and the length of the laying preferably distributed regularly and evenly sales. The length of the turnover of the reinforcement elements of the additional reinforcement in the plane of each layer preferably exceeds 0-2% and more preferably at 1-1,4% of the length of the laying of the above elements.

According to this second variant of an additional reinforcement formed elements, wavy in the plane of each layer or layer, while the elements have a specific sine wave, the wavelength is in the range from 20 to 100 mm

According to this second variant implementation of the present invention, the additional layer is preferably made of a reinforcing elements oriented in the longitudinal direction, and the layer stack zigzag in the same way as described above. Tequivalent can be performed by any known in the art methods.

According to another variant of the invention, the additional valves are made of layers of metallic reinforcement elements, characterized by the curve of the tensile stresses, depending on the relative elongation, contains a gentle slope for small movements and essentially continuous and steep slope for greater extensions.

According to a preferred variant of the invention, the additional valve is fitted between the two working layers of the ridge.

Under this option, additional reinforcement has a thickness of less than 2,4 mm Above this value compression or expansion during rolling can cause deterioration of characteristics.

According to another variant of the invention, the additional valve is situated above the working layer of the ridge. Under this option, an additional layer can be used instead of the protective layer. Indeed, the properties for the layer and, in particular, the diameter of its amplifying elements contribute to the penetration of rubber or rubber mass between the cord filaments forming the reinforcing members so that the additional layer is sufficiently promotes the protection, in particular against corrosion and replaces protective layer, if necessary to ensure this property.

Dougiefresh and distinctive features of the present invention will be more apparent from the description of examples with reference to figures 1-3:

figure 1 represents a schematic view in longitudinal section of the valve crest in accordance with the present invention;

figure 2 is a view in plan of the valve, showing the individual layers;

figure 3 is a side view of an additional reinforcement.

To facilitate understanding of the figure presents not to scale.

Pneumatic tire 1 size 315 70 R22.5 X contains radial frame fittings made from one layer 2 inextensible metal cord threads are fixed in each Board at least on one side of the ring, forming a wound form around the side of the ring circulation (not shown). Above mentioned frame reinforcement 2 in the radial direction of the stack armature 3 of the crest, and above it - protector 5. The armature 3 of the crest contains the direction from inside to outside:

the first functional layer 31 of the comb, made of inextensible metal banding cord yarns 27×23 (inextensible call cord thread, which under the force equal to 10% of their tensile strength, have an elongation not exceeding 2%), these cord filaments have a diameter of 1.3 mm, parallel to each other in the layer and are arranged with a pitch of 2.5 mm (measured perpendicularly mentioned cord threads). Mentioned cord thread form with the circumferential direction an angle α (2)being in the range from 10 to 35° and in the above case is 18°. In its edges of the first mentioned layer 31 is separated in the radial direction from directly below the frame reinforcement profiles 4 of the rubber mass having essentially triangular shape, which allows to obtain the meridional profile of the mentioned layer 31 is almost zero curvature;

- additional valve 32 located in the radial direction on the first working layer 31 and consisting of three layers 321, 322, 323, made by winding around the working layer 31 layer 32 consisting of sets of five segments inextensible rebanding circular cord yarns, made of steel SHT 3×18 (called circular cord thread forming with the circumferential direction an angle within the range of 0±to 2.5°), small diameter, equal to 0.4 mm, separated from each step, equal to 0.7 mm Figure 3 breaks are clearly exaggerated and arbitrary length, to more clearly show the mentioned gaps for three turns of the winding;

- additional valve 32 overlap the second working layer 33 of the ridge formed by the retaining metal cord threads 27×23, identical to the cord threads of the first layer 31 located on the same step and forming with the circumferential direction an angle βopposite the corner α cord yarns of the first layer and in the described case is referred to the corner α (it may be different from the above-mentioned angle α);

- at this time, the valve 3 crest supplemented by a layer 34 of so-called elastic steel cord yarns e oriented relative to the circumferential direction at an angle χhaving the same direction as the angle βand equal to the aforementioned corner β (though it may be different), these layer 34 is a so-called protective layer, and an elastic cord filaments are filaments having at break elongation in excess of 4%.

This structure is easier to implement due to the use of cord threads of small diameter: layer manufactured by calendering n parallel cord yarns, easily cut, easily winded, and, in addition, taking into account the best soaking cord yarns rubber for calendering, cracks in the rubber on the ends of the cord yarns in the discontinuities between segments appear later and spread more slowly, which significantly increases the mileage of the tire.

Excellent results can be obtained by replacing the three layers of sets of segments three layers of cord yarns, wavy in the plane of each layer. For example, in the center of each additional layer of reinforcement mentioned cord thread are wavy, corresponding to a residual elongation of 0.5% and having a wavelength of λ, ravno is 30 mm. Similarly, you can change in the axial direction of the linear stiffness of the strain layer from the segments cord yarns, changing the number of breaks or the length of the segments, you can also change the linear stiffness by reducing the amplitude of the waviness: it is preferable that the amplitude was smaller at the edges of the layers of winding than in the center of the above-mentioned layers.

The results obtained thanks to the invention, show that the pneumatic tyre has properties, in particular, from the viewpoint of durability, quite comparable with the best products, manufactured at the present time, while significantly reducing production costs. Indeed, the use of reinforcing elements of small diameter, as well as performing additional layer of circular reinforcement by winding only one layer or overlay each other two layers or more, on the one hand, allows to simplify and reduce the cost of manufacture and, on the other hand, improves the properties of durability of the pneumatic tire compared to previous technologies.

1. Pneumatic tyre R containing radial frame fittings (1), above which in the radial direction placed the armature (3) of crest, consisting of at least two working layers (31, 33) of the comb formed of metal reinforcing elements, crossed from one the layer (31) to the next (33), forming with the circumferential direction angles being in the range from 10 to 35°and at least one additional valve (32)formed of metal reinforcing elements oriented in the circumferential direction, characterized in that the additional valve (32) perform at least two layers (321, 322, 323) of metal elements of small diameter, not more than 0.6 mm, the metal reinforcing elements of the additional valve (32) are Assembly type 1×n, with n ranging from 2 to 5, made of steel with high resistance to tear SHT, and the diameter of the filaments is in the range from 12/100 to 30/100 mm

2. Pneumatic tire according to claim 1, characterized in that the additional valve (32) is performed by winding only one layer with the formation of at least two layers of metal elements.

3. Pneumatic tire according to claim 1, characterized in that the armature of the crest contains layers of rubber compound radially inside and/or outside of the ends of the layers of reinforcement elements of the additional reinforcement along the axial width of the above-mentioned layers of reinforcing elements.

4. Pneumatic tire according to claim 1, characterized in that the additional valve (32) are made of layers of fractionated metal reinforcing elements, with segments or groups of segments have a length(length), Menchu is(s) of a circumferential length of the reservoir, moreover, the gaps between segments or assemblies of segments are displaced in circumferential and axial directions relative to each other.

5. Pneumatic tire according to claim 1, characterized in that the length of the reinforcement elements of the additional reinforcement of sales in the plane of each layer exceeds 0-3% of the length of the laying of the above elements, preferably an increase of 0-2%, or more preferably 1-1,4%.

6. Pneumatic tire according to claim 5, characterized in that the reinforcement elements of the additional valve (32) perform wavy in the plane of each layer, and the wavelength of the zigzag is in the range from 20 to 100 mm

7. Pneumatic tire according to claim 1, characterized in that the additional valve (32) are made of layers of metallic reinforcement elements, characterized by the curve of the tensile stresses, depending on the relative elongation, contains a gentle slope for small values of elongation and essentially continuous and steep slope for higher values of elongation.

8. Pneumatic tire according to claim 1, characterized in that the additional valve (32) is positioned radially between two working layers (31) and (32).

9. Pneumatic tire of claim 8, characterized in that the valve (32) has a thickness of less than 2,4 mm

10. Pneumatic tire according to claim 1, characterized in that the additional arm is round (32) positioned in the radial direction on the outside in the radial direction of the working layer (33).



 

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EFFECT: increased strength of pneumatic tire crown.

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