Pneumatic tire with protective layer of crown made of poly-m- phenylene isophthamide fiber

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

 

The present invention relates to a pneumatic tire with a radial valve frame and, more specifically, protection of reinforcement ridge such pneumatic tires.

Pneumatic tires are designed for driving in difficult conditions, such as soil containing gravel or sharp objects usually represent a reinforcement of the ridge containing the unit of work and located outside in the radial direction of the fuse block. The unit of work is designed for the perception of effort resulting from the inflation of this pneumatic tyres and rolling on the ground. Fuse block is designed to protect the layers of the working unit from damage associated with strokes and gaps arising in the process of operation, and contains at least one layer parallel between the reinforcing elements. These reinforcing elements of the safety layer often have a relative elongation to rupture in excess of the value of the relative elongation to break for the working layers of the ridge that these safety-enhancing elements protect.

To increase the armature resistance of the ridge such pneumatic tires in the patent document WO 99/00260 described pneumatic tire containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the sides, and ar is the atur ridge, moreover, this valve crest contains, when viewed from the outside in the radial direction, work unit and fuse block with at least one layer parallel between a reinforcing elements oriented essentially in the circumferential direction, and in this block protective layer is formed of an elastic metal reinforcing elements. In this pneumatic tire, the layer of the working unit, which is adjacent to the protective layer, formed of inextensible metal reinforcing elements.

The object of the invention is the design of pneumatic tires, which allows to significantly increase the resistance of the armature of the ridge, in particular, in the case of a pneumatic tire for airplanes.

In a subsequent statement, the following terms and expressions should be understood as follows:

"titer" is the mass in grams of a reinforcing element with a length of one thousand meters; the titer is expressed in the texts; stress is exposed reinforcing element, the tensile strength (stress rupture divided by the titer) or module of this effort is expressed in cN/tex, where cN denotes Santi-Newton; the elongation of the element until it breaks indicated in percent;

- "reinforcing element" is any element amplification, the imp is United in the form of thread and can enhance a certain matrix, for example the rubber matrix; as reinforcing elements in this case will be referred to, for example, a multi-fiber strands, and these strands may be twisted or not twisted about themselves, unitary filaments, such as single filaments with a high elementary in diameter, with a twist or no twist about themselves, cord thread or twisting, obtained by executing operations slyvania or twisting of these single yarns or fiber strands, and such reinforcing elements may be hybrid, that is, composite or compound containing elements of different nature;

- "twisted thread" - a reinforcing member formed by two or more strands that are connected into a single unit by using the twisting operation; these strands, usually educated multi-fiber yarns, primarily individually twisted in one direction (the direction of twist S or Z) in the process of implementation of the first phase of the curl, and then twisted together in the opposite direction (the direction of the curl Z or S, respectively) during the second phase of the curl;

- to determine the value of the angle of the helical line is considered a curl generated during the second phase of the curl, use the following formula (p is minimoy for homogeneous assemblies):

in which:

N is a torsion applied to the set of strands and expressed in number of turns per meter

T is the titer of strands used, expressed in texts,

d is the density of the considered reinforcing element, and aramid has a density of 1.44,

n represents the number of strands in this yarn, and

γ represents the angle of the spiral curl, expressed in degrees.

"amplifying element with improved adhesion" - a reinforcing member subjected to proper processing of the coating, the so-called sizing or increased adhesion, which is able to give it a reinforcing element of the coupling, after appropriate heat treatment, the matrix for which it was intended;

- "axis" orientation parallel to the axis of rotation of this pneumatic tyres; axial orientation can be internal in the axial direction in the case when the orientation is towards the inside of the pneumatic tire and the outside in the axial direction in the case when the orientation is towards the outer side of the pneumatic tire;

- radial orientation, perpendicular to the axis of rotation of this pneumatic tire and passing che the ez this axis of rotation; radial orientation can be internal in the radial direction" or "outside in the radial direction in the matter, whether it is directed towards the axis of rotation of this pneumatic tyres or towards the outer part of this pneumatic tyres;

"modulus of elasticity" rubber mixture represents the secant modulus, strain at strain of 10% and at normal ambient temperatures;

- "inextensible metal reinforcing element is a reinforcing member having an elongation, which value is measured under a force of 10% from the efforts of its rupture, does not reach 0.2 percent;

- "flexible metal reinforcing element is a reinforcing member having an elongation of more than 0.5% and measured by the impact of the efforts of 10% from the efforts of its rupture;

- "amplifying element, oriented in the circumferential direction, the reinforcing element is oriented essentially parallel to the regional direction of the pneumatic tire, that is, forming with the direction of the angle, not differing by more than five degrees from this district; and

- "amplifying element, oriented in the radial direction, the reinforcing element located essentially in the same axial plane or flat the STI, forming with the axial plane angle, the value of which does not exceed 10°.

The mechanical properties of the reinforcing elements are defined in the reinforcing elements, which were subjected to preliminary normalization. In this case, the expression "pre-normalization" refers to the preservation of the reinforcing elements prior to performing measurements for at least 24 hours in a standard atmosphere in accordance with European norm DIN EN 20139 (air temperature 20°±2°C; relative humidity 65%±2%).

Later under the original modulus of elasticity of the reinforcing element after application to this reinforcing element source voltage tension equal to the sum of the credits of each of the elementary strands (i.e. the source of the tensile stresses, amounting to 0.5 cN/tex), it should be understood secant modulus measured at this reinforcing element in the same conditions under which the normalization, when deformation at the level of 0.7%; however, the samples have an initial length, which is 400 mm, and the rate of elongation of the test sample is 200 or 50 mm/min in the case where the elongation of this a reinforcing element to the gap has a value less than 5%); measurement of modulus of elasticity and tensile stresses, the implied is given as averages of ten test samples. The initial modulus of elasticity of the reinforcing element is usually determined with a precision of the order of ±10%.

Pneumatic tire in accordance with the invention contains a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge. This valve crest contains, in the radial direction from the inside out, work unit and fuse block. This fuse block contains at least one layer parallel between a reinforcing elements oriented in the circumferential direction. This pneumatic tire is characterized in that the protective layer unit is formed of reinforcing elements made of aromatic polyamide with an initial elastic modulus having a value less than 1000 cN/tex and a breaking strength greater than 65 cN/tex.

Preferably the initial elastic modulus is made of aromatic polyamide reinforcing elements of the layer of the safety block has a value less than or equal to 500 cN/tex.

The object of the present invention is also a pneumatic tire containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge. This valve crest contains, in the radial direction from the inside out, work unit and fuse block. E is from the fuse block contains at least one layer parallel between the reinforcing elements, oriented in the circumferential direction. This pneumatic tire is characterized in that the layer parallel between a reinforcing elements having a circumferential orientation, formed of reinforcement elements made of aromatic polyamide so that the angle of the spiral twisting of these reinforcing elements exceeds 28 degrees.

These are made of aromatic polyamide reinforcing elements are the so-called "two-module" curve efforts elongation. This means that if a small relative movements of the source module tensile reinforcing element is small and is less than 1000 cN/tex, and even less than 500 cN/tex, whereas outside these small relative movements curve of force extend substantially straightened. Therefore, the safety layer of the crest in accordance with the proposed invention does not accept or does not react to the effort of pulling comb pneumatic tyres arising from its inflation under the action of centrifugal forces. These efforts are perceived by one or more layers of the working unit crest. The reinforcing elements of the relief layer of the crest in accordance with the proposed invention is not subjected to tensile stress during normal operation the Oia pneumatic tires and they are able, thus, to perform their safety functions in the process of passing this pneumatic tires by cutting or blunt objects such as gravel or stones. These reinforcing elements are very well perform its safety function due to its high tensile strength in combination with excellent properties of resistance to tearing of the reinforcing elements made of aromatic polyamide.

It should also be noted that this relief layer of the ridge, the reinforcing elements is made of an aromatic polyamide with a very large angle spiral curl, provides superior grip safety unit with a working unit. Indeed, in tests implemented at very high speeds, established a significant advance in this field.

Preferably the angle of the spiral torsion reinforcing elements has a value less than or equal to 38 degrees. Indeed, beyond this value of the angle of helical twisting becomes very difficult the use of reinforcing elements due to the effects of torsion.

The preferred range of values of the angle of the spiral torsion reinforcing elements is the range from 31 to 38 degrees. And to save the two-character condition is counteracted elements in the process of their treatment for improving the adhesion, it is preferable to maintain the applied tensile stress at the level of less than 3 cN/tex, and even at the level of less than 1.5 cN/tex.

In this range, change the angle of the spiral curl installed that, thematisiert curve strength elongation obtained reinforcing elements using two tangents, one of which is made in the beginning of the curve, corresponding to the input module strain, and the other made in the area of the gap, you can determine the point of intersection of these two tangents as the transition point And this reinforcing element. This transition point is in the range of 5 to 8% relative elongation, which is much higher than the elongation at break for the usual reinforcing element of aromatic polyamide having a value on the order of 4-5%.

Titles reinforcing elements used in the safety block of the pneumatic tire in accordance with the invention, preferably exceed 600 tex.

Preferably the valve crest of the pneumatic tire in accordance with the present invention is that the protective layer of the block formed by the reinforcing elements oriented in the circumferential direction, is adjacent the outside in the radial direction to a layer parallel to each other and oriented in the circumferential direction reinforcing elements of the working block.

Preferably this layer of the working unit contains reinforcing elements, the IP is odny module for exceeding 1800 cN/tex. These reinforcing elements may be made of aromatic polyamide with an angle spiral curl with a value of less than 26 degrees. Elongation at break of such reinforcing elements has a value of from 4 to 5%.

The armature of the crest of the pneumatic tire in accordance with the present invention is such that the forces occurring due to inflation, and the centrifugal efforts are well accepted by layers of the working unit, since the transition point And reinforcing elements forming the protective layer is located outside relative elongation at break for reinforcing elements having a circumferential orientation and forming adjacent reinforcing layer unit of work.

Preferably the protective layer of the block extends in the axial direction beyond the operating unit on either side of the mean plane of the pneumatic tire.

The object of the present invention is also an aircraft pneumatic tire containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge, and this valve crest contains, from inside to outside in the radial direction, work unit and fuse block having at least one layer of reinforcing elements parallel to each other and guide the bathrooms are essentially in the circumferential direction, characterized in that the protective layer unit is formed of reinforcing elements made of aromatic polyamide, and such that the angle of the spiral twisting of these reinforcing elements exceeds 28 degrees.

The present invention relates to pneumatic tires for heavy road vehicles, containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge, and this valve crest contains, from inside to outside in the radial direction, work unit and fuse block having at least one layer of reinforcing elements parallel to each other and oriented essentially in the circumferential direction, in which according to the invention, this layer of the safety block is formed of reinforcing elements made of aromatic polyamide, and such that the angle of the spiral twisting of these reinforcing elements exceeds 28 degrees.

Below are examples of implementation of the present invention, when an aircraft pneumatic tires with references is given in Annex figures, among which:

Figure 1 is a schematic view in axial section of a pneumatic tire in accordance with the invention;

Figure 2 is schematizes the s view in axial section of a second method of implementation;

Figure 3 is a schematic view in axial section of a third method of implementation;

Figure 4 represents curves between force and elongation for several reinforcing elements;

Figure 5 presents the curves between force and elongation for two additional reinforcing elements.

Aircraft pneumatic tire 1, schematically represented in half axial section in figure 1, contains the comb 2, two sidewalls 3 and two side 4. The valve frame 5 passes from one side to the other and formed by two circumferential rows 6 and 7 of the first reinforcing elements. These circumferential alignments of first reinforcing elements 6 and 7 are oriented essentially in the radial direction in the side walls 3 and is formed of reinforcing elements made of aromatic polyamide or aramid. These first reinforcing elements arranged parallel to each other and separated by a layer of rubber mixture 8, nature and the module which is adapted in function of its location in this pneumatic tire.

Figure 1 also presents the first example of implementation of the armature of the ridge 14. This valve crest formed a working unit and a protection unit. Fuse block contains the layer 17 formed by the reinforcing elements made of aromatic p is lamida and with the angle of the spiral twisting in the range from 28 to 38 degrees and the title, exceeding 600 tex. Work unit contains two have essentially circumferential orientation of the layer of reinforcing elements 15 and 16 obtained by helical winding of at least one reinforcing element. This strengthening of the working unit contains reinforcing elements made of aromatic polyamide or aramid. These reinforcing elements are the source module, the value of which exceeds 1800 cN/tex, and twisted yarns of aramid have a spiral angle of twist is less than 26 degrees.

The number of layers of reinforcing elements of the working unit, and the step of stacking adapted in function of the dimensions of this pneumatic tyres and the conditions of its operation. This way the implementation of the reinforcement ridge has the advantage that it provides a very effective contraction, which minimizes dimensional changes of the pneumatic tire during inflation, as well as when driving at high speed. It is established that the change in profile may be three to four times smaller than for conventional aircraft pneumatic tires, for example for pneumatic tyres of size 30-7 .7R16 AIRX. This is an excellent contraction also has the advantage of preventing a strong stretching of the rubber mixtures, forming a treadmill rolling ridge this pneumatic tyres. The formation of cracks on the poverhnosti treadmill rolling, due to the presence of ozone in the air, is also significantly reduced.

It was also found that provides excellent adhesion layer 17 of the safety block with adjoining layer 16.

The armature of the ridge 41 of the pneumatic tire 40, schematically presented in figure 2, contains, as in the previous case, two layers of reinforcing elements 15 and 16, having essentially circumferential orientation and added two layers 42 and 43 of the reinforcing elements with the original module, exceeding 1800 cN/tex, oriented essentially in the circumferential direction and arranged in the axial direction on either side of the mean plane of this pneumatic tire in the lateral zones L its crest. These layers are also formed aromatic reinforcing elements having the source module, the value of which exceeds 1800 cN/tex. These reinforcing elements enhance the contraction of the sides L of the ridge pneumatic tyres. Layers 42 and 43 are arranged in the radial direction between the layers 15 and 16 and the valve frame 5.

The valve 41 is also supplemented with protective layer of the ridge 44 located outside in the radial direction relative to the other layers of reinforcement ridge 41. This protective layer of the ridge is formed, as in the previous case, aramid reinforcing elements with very in the high torsion, oriented essentially in the circumferential direction. Here it should be noted that this relief layer extends in the axial direction beyond the layers 15 and 16 on either side of the Central plane P of this pneumatic tyres for some axial distance A.

Figure 3 shows schematically a pneumatic tyre 50 with the valve of the ridge 51, which further comprises two layers of reinforcing elements 52, 53, parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction an angle α, the value of which lies in the range from 5 to 35 degrees, and these reinforcing elements are the source module, the value of which exceeds 1800 cN/tex. These reinforcing elements may also be made of aromatic polyamide with an angle spiral curl, the value of which is less than 26 degrees. These two layers are arranged in the radial direction over the district of layers of reinforcing elements 15 and 16. Two of these layers increase the pushing force of the demolition of pneumatic tires 50 relative to the pushing force of the demolition of the pneumatic tire 40. This pneumatic tire is specifically adapted to be used as a pneumatic tire for a managed front landing gear of the aircraft. A similar design is also can be applied to pneumatic tires, designed for heavy vehicles.

In all three of the above examples, the implementation of the consolidation of two circumferential rows 6 and 7 of the reinforcing elements are provided in the flanges 3 by means of series or "packages" 9 second reinforcing elements oriented in the circumferential direction and arranged in the axial direction on either side of each district's number of the first reinforcing elements 6 and 7. Each number or package 9 the second reinforcing elements can be obtained by helical winding of one reinforcing element. The first reinforcing elements, which are radial, and the second reinforcing elements, which are the district, separated from each other by a layer of rubber mixture of 10 with a very high modulus of elasticity to eliminate any possibility of direct contact of one reinforcing element with another. Lateral coupling between each district near 6 and 7 and packages 9 circumferential reinforcing elements allows us to perceive tensile stress, which occurs in the first of these reinforcing elements in the process of inflating the pneumatic tire 1. Such design of the sides provides excellent fixation, which remains effective even at very high values of inflation pressure aircraft pneumatic W is n, in excess of 12 bar and reaching in some specific cases, the use of 25 bar.

Packages 9 second reinforcing elements are divided into three groups, with two packages 11 are arranged in the axial direction outside from the valve frame 5 from the outside of this pneumatic tires, two packages 12 are located inside in the axial direction relative to the valve frame 5 from the inner side of this pneumatic tires and 4 of the package 13 is located between the two circumferential rows 6 and 7 of the valve frame 5.

The armature of the crest of the pneumatic tire in accordance with the invention can also be used in conjunction with reinforcement frame in the usual manner fixed in the sides of this pneumatic tire with a turnover of around the appropriate side of the ring.

4 shows curves of the force changes relative elongation for four reinforcing elements made of aromatic polyamide used in the pneumatic tire in accordance with the proposed invention are:

curve 1 corresponds yarn with high adhesion and angle spiral curl at 31.5 degrees;

curve 2 corresponds yarn with high adhesion and angle spiral curl 34 degrees;

curve 3 corresponds yarn with high concatenate the STU and the angle of the spiral twisting in 38 degrees;

curve 4 corresponds yarn with high adhesion and angle spiral curl 21 C.

Shown in this figure the curves are on the x-axis elongation yarn in % and are on the y-axis the ratio between the applied force and the title of this yarn, which corresponds to the tensile strength, expressed in cN/tex.

Curve 4 corresponds yarn with high adhesion with the title 735 tex and manufactured on the basis of two identical strands of aramid fibers with a titer of 330 tex, twisted individual-level 230 turns on the meter, and then twisted at the same time and together at the level of 230 turns per meter in the opposite direction, which gives this yarn angle spiral curl 21 degrees. Elongation at break of this yarn is of 4.45%, and the source module has a value of 2000 cN/tex. The tensile strength of this yarn is 133 cN/tex.

Curve 1 corresponds yarn with high adhesion with the title 1235 tex and manufactured on the basis of three identical strands of aramid fibers with a titer of 330 tex, twisted individual-level 310 turns on the meter, and then twisted at the same time and together at the level of 310 turns per meter in the opposite direction, that come the et this yarn angle spiral curl at 31.5 degrees. Elongation at break of this yarn is 8.8%, and the source module has approximately 480 cN/tex, and the tensile strength is 104 cN/tex. Curve based efforts stretching and relative elongation of this yarn is two-character, marked by the transition point A1, which is located at the level of the order of 5.7%.

Curve 2 corresponds to a yarn with a high adhesion with the title 1291 tex and manufactured on the basis of three identical strands of aramid fibers with a titer of 330 tex, twisted individual-level 350 turns per meter, and then twisted at the same time and together 350 turns per meter in the opposite direction, which gives this yarn angle spiral curl 34 degrees. Elongation at break of this yarn is 10.2%, and the source module has approximately 330 cN/tex, and the tensile strength is 90 cN/tex. The transition point A2 of the curve showing the dependence between the force of the tensile and elongation, is located at about 6.9 per cent.

Curve 3 corresponds yarn with high adhesion with the title 1371 tex and manufactured on the basis of three identical strands of aramid fibers with a titer of 330 tex, twisted individual-level 390 turns per meter, and then the TFR is obtained simultaneously and jointly at the level of 390 turns per meter in the opposite direction, what gives this yarn angle spiral curl at 38 degrees. Elongation at break of this yarn is 12.3%, and the source module has a value of about 165 cN/tex, and the tensile strength is 68 cN/tex. The transition point A3 curve showing the dependence between the force of the tensile and elongation is at the level of the order of 7.7%.

Yarn in accordance with the invention in the usual manner was processed to improve adhesion with sequential use of two bathrooms, and in the process bath prior to make high adhesion ensures the application of adhesive type epoxy resin, and the second bath ensures the application of adhesive type RFL. Tensile stress during processing in the first tub is 1 cN/tex and during processing in the second tub is 0.6 cN/tex. During this processing temperature is 230°C.

These curves between the force of the tensile and elongation clearly demonstrate behavior modification that is associated with an increase in the degree of twisting twisted yarns. These three curves represent two type of behavior, marked by the transition point A, which is located at the level of the relative elongation, increased ausencia with increasing angle spiral curl.

Figure 5 presents curves between the force of the tensile and elongation for the two reinforcing elements in accordance with the invention. Curve 5 corresponds yarn with high adhesion with the title 791 tex and manufactured on the basis of two identical strands of aramid fibers with a titer of 330 tex, twisted individual-level 360 turns on the meter, and then twisted at the same time and together at the level of 360 turns per meter in the opposite direction, which gives this yarn angle spiral curl at 31.5 degrees. Elongation at break of this yarn is 8.2%, and the source module has a value of about 500 cN/tex, and the tensile strength is 96 cN/tex. The transition point A5 of this curve is located at the level of about 4.7%. Here you can see a behavior similar to the behavior of twisted threads corresponding to the above curve 1.

Curve 6 corresponds yarn with high adhesion with the title 848 tex and manufactured on the basis of two identical strands of aramid fibers with a titer of 330 tex, twisted individual at 450 revolutions per meter, and then twisted at the same time and together at 450 revolutions per meter in the opposite direction, which gives this yarn angle of spiral skru the air traffic management at 37.5 degrees. Elongation at break of this yarn is 10.8%, and the source module has a value of the order of 300 cN/tex, and the tensile strength is 72 cN/tex. The transition point A6 of this curve is at about 6.9 per cent. Here you can see the behavior of this yarn, which is close to the behavior of twisted threads corresponding to curve 3.

There were conducted tests of the pneumatic tire in accordance with the invention, having a size 30-7,7 R 16 and containing:

as the valve frame three district number first reinforcing elements formed of woven filaments with increased adhesion, made on the basis of 3 identical aramid strands with a titer of 167 tex; the density of the first reinforcing elements 88 fibers on EBM in the area of the flanges;

as the second reinforcing elements steel single wire having a diameter of 0.98 mm and distributed to 13 units in batches 9:

3 most internal in the axial direction of the package 14, 17 and 20 turns,

- 4 package between the first and second circumferential rows 10, 14, 16, and 20 turns,

- 3 pack between the second and third circumferential rows with 19, 15 and 10 turns, and

3 most outside in the axial direction of the package 14, 10 and 7 turns,

- reinforcement of the ridge, having in its composition:

- three layers of reinforcing elements oriented), the Wu in the circumferential direction, and represents a yarn with high adhesion, with a title equal to 735 tex, made on the basis of two identical strands of aramid fiber 330 tex (curve 4); these reinforcing elements are laying step 1.2 mm; and

- protective layer formed by the reinforcing elements with the angle of the spiral twisting of 38 degrees, the corresponding amplifying element curve 6 based efforts from relative elongation.

The layer of rubber compound with a very high modulus of elasticity has a secant modulus, tensile 45 MPa and a hardness shore a 90.

This pneumatic tire has been tested according to the tensile strength, and maximum measured pressure was approximately 100 bar. It is also characterized by a degree of increase of its size at the transition from zero pressure to the operating pressure of 15 bar, the value of the order of 1.5%. This pneumatic tyre also successfully tested on the rise, similar tests, normalized to the certification of aircraft pneumatic tires.

This pneumatic tyre was compared with the pneumatic tire of conventional design, containing the reinforcing elements of the valve frame, made of nylon, and the armature of the ridge with several layers of contraction, also educated reinforcing elements made of nylon and metal safety SL is eat ridge. This protective layer was formed metal reinforcing elements arranged undulating manner in the plane of the comb in order to ensure the greatest possible efficiency.

Tested corresponded to the forced rolling pneumatic tire on the wheel, containing a series of hemispherical protrusions with dimensions adapted to damage the valves of the crest of these pneumatic tire. Both tested pneumatic tyres showed almost identical strength. Therefore, the safety layer of the crest in accordance with the invention has the advantage that it provides strength in relation to traffic projections, the metal protective layer, with superior resistance to oxidation reinforcement of the ridge.

The manufacture of pneumatic tires according to the invention preferably can be implemented on a hard core that defines the shape of the inner cavity of the pneumatic tires, such as those cores, which are described, for example, in patent documents EP 242840 or EP 822047. This core is put in the order, determined the final architecture of pneumatic tires, all components of this pneumatic tires that place who are stated directly in their final position, and is not subject to any forming operations in the manufacturing process. Vulcanization is carried out on the core, which is removed only after completion of vulcanization.

Such a method of manufacturing a pneumatic tire has the advantage that significantly reduced and even completely eliminated, preliminary mechanical stresses acting on the reinforcing elements, in particular on the reinforcing elements oriented at an angle 0°in the process of doing the traditional operations of manufacturing pneumatic tires.

You can also partially cooling bandage, located above the core, to maintain the reinforcing elements in the state of deformation, defined in the process of their installation.

You can also equivalently to produce a pneumatic tire on the drum of the type described in patent documents WO 97/47463 or EP 0718090, in implementing the molding blanks pneumatic tyres before making laying reinforcing elements oriented in the circumferential direction.

You can also laying reinforcing elements oriented in the circumferential direction, on the form, with geometric parameters, identical geometrical parameters up form. Then, the thus formed unit crest combined with complement its preparation in accordance with the tvii with technology transfer, well-known specialist in this field of technology, and then also in accordance with known principles of this pneumatic tire is put in the form and subjected to pressure by expanding the membrane inside the pneumatic tires.

This method of implementation also guarantees the absence of preliminary mechanical stresses resulting from forming on the vulcanizing press.

1. Pneumatic tire containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge, and this valve crest contains in the radial direction from inside to outside the work unit and fuse block containing at least one layer parallel between a reinforcing elements oriented essentially in the circumferential direction, characterized in that the protective layer unit is formed of reinforcing elements made of aromatic polyamide with a source module, having a value less than 1000 cN/tex and a breaking strength greater than 65 cN/tex.

2. Pneumatic tire according to claim 1, wherein the source module is made of aromatic polyamide reinforcing elements has a value less than or equal to 500 cN/tex.

3. Pneumatic tire containing a comb, two sidewalls and two beads, and so is e to the valve frame, fixed in each of the flanges, and valves of the ridge, and this valve crest contains in the radial direction from inside to outside the work unit and fuse block containing at least one layer parallel between a reinforcing elements oriented essentially in the circumferential direction, characterized in that the protective layer unit is formed of reinforcing elements made of aromatic polyamide so that the angle of the spiral torsion reinforcing elements exceeds 28°.

4. Pneumatic tire according to claim 3, characterized in that the angle of the spiral torsion reinforcing elements has a value less than or equal to 38°.

5. Pneumatic tire according to claim 3 or 4, characterized in that the angle of the spiral torsion reinforcing elements has a value in the range 31-38°.

6. Pneumatic tire according to any one of claims 1 to 5, characterized in that attached to reinforcing tensile stress in the course of their treatment for improving the bonding has a value less than 3 cN/tex.

7. Pneumatic tire according to claim 6, characterized in that attached to reinforcing tensile stress in the course of their treatment for improving the bonding has a value less than 1.5 cN/tex.

8. Pneumatic tire according to any one of claims 1 to 7, characterized in that the title Wuxi is ivalsa elements in the layer of the safety unit exceeds 600 tex.

9. Pneumatic tire according to any one of claims 1 to 8, characterized in that the protective layer of the block adjacent on the outside in the radial direction to a layer parallel to each other and oriented essentially in the circumferential direction reinforcing elements of the working block.

10. A pneumatic tyre according to claim 9, characterized in that the reinforcing elements of the layer of the working unit have an initial modulus of elasticity, the value of which exceeds 1800 cN/tex.

11. A pneumatic tyre according to claim 9, characterized in that the reinforcing elements of the layer of the working unit are components that are made from aromatic polyamide, with a spiral angle of twist of less than 26°.

12. Pneumatic tire according to any one of claims 1 to 11, characterized in that the protective layer of the block extends in the axial direction beyond the operating unit on either side of the mean plane of the pneumatic tire.

13. Aircraft pneumatic tire containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge, and this valve crest contains from inside to outside in the radial direction, work unit and fuse block having at least one layer of reinforcing elements parallel to each other and oriented essentially in the circumferential direction, characterized in that the layer that the safety block is formed of reinforcement elements, made of aromatic polyamide and having an initial modulus of less than 1000 cN/tex and a breaking strength greater than 65 cN/tex.

14. Aircraft pneumatic tire according to item 13, wherein the unit of work reinforcement ridge contains at least one layer parallel between a reinforcing elements oriented in the circumferential direction and having an initial modulus in excess of 1800 cN/tex, adjacent to the layer of the safety block.

15. Aircraft pneumatic tire 14, wherein the ridge has a Central zone and two lateral zones, work unit further comprises two layers of reinforcing elements, with an initial modulus in excess of 1800 cN/tex, oriented in the circumferential direction and arranged in the axial direction on either side of the mean plane of this pneumatic tire in the lateral zones of the ridge.

16. Aircraft pneumatic tire 14 or 15, characterized in that the working unit further comprises two layers of reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction an angle α, the value of which lies in the range of 5-35°and the reinforcing elements have an initial modulus in excess of 1800 cN/tex.

17. Pneumatice the Kai tire for heavy road vehicles containing a comb, two sidewalls and two beads, and the valve frame, mounted in each of the flanges, and valves of the ridge, and this valve crest contains from inside to outside in the radial direction of the work unit and fuse block having at least one layer of reinforcing elements parallel to each other and oriented essentially in the circumferential direction, characterized in that the protective layer unit is formed of reinforcing elements made of aromatic polyamide with an initial elastic modulus having a value less than 1000 cN/tex and a breaking strength greater than 65 cN/tex.

18. Pneumatic tire for heavy road vehicles under 17, characterized in that the working unit valve crest contains at least one layer parallel between a reinforcing elements oriented in the circumferential direction, with an initial modulus in excess of 1800 cN/tex, adjacent to the layer of the safety block.

19. Pneumatic tire for heavy road vehicles on p, wherein the ridge has a Central zone and two lateral zones, and work unit further comprises two layers of reinforcing elements, with an initial modulus in excess of 1800 cN/tex, oriented in the circumferential direction and located the axial direction on either side of the Central plane of the pneumatic tire in the lateral zones of the ridge.

20. Pneumatic tire for heavy road vehicles on p or 19, characterized in that the working unit further comprises two layers of reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction an angle α, the value of which lies in the range of 5-35°and these reinforcing elements have an initial modulus in excess of 1800 cN/tex.



 

Same patents:

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

The invention relates to the automotive industry

The invention relates to road transport

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker consisting of metal cord and textile layers, carcass, side strips and bead rings. Diameter of metal cord is from 0.83 to 0.91 mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.280 to 0.331. ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.978 to 2.168, and linear density of metal cord lies within 2.64 and 2/96 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.538 to 1.839, and breaking strength of metal cord is not lower than 8555N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyre.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 0.87 to 0.97mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.242 to 0.293. Ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.85 to 2.076, and linear density of metal cord lies within 2.84 and 3.16 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.62 to 1.85, and breaking strength of metal cord is not lower than 9555N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyres.

2 dwg

FIELD: automatic industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 1.14 to 1.26 mm. Metal cord proper is made of equal-diameter metal threads, ratio of metal thread diameter to diameter of metal cord being from 0.253 to 0.298. Ratio of breaker metal cord pitch to diameter of metal cord is from 1.9 to 2.25, and linear density of metal cord lies within 5.0 and 5.5 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 0.35 to 1.49, breaking strength of metal cord being not lower than 17155N.

EFFECT: reduced materials usage, labour input and energy consumption at production of tyres.

2 dwg

The invention relates to the automotive industry

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

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

FIELD: automatic industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 1.14 to 1.26 mm. Metal cord proper is made of equal-diameter metal threads, ratio of metal thread diameter to diameter of metal cord being from 0.253 to 0.298. Ratio of breaker metal cord pitch to diameter of metal cord is from 1.9 to 2.25, and linear density of metal cord lies within 5.0 and 5.5 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 0.35 to 1.49, breaking strength of metal cord being not lower than 17155N.

EFFECT: reduced materials usage, labour input and energy consumption at production of tyres.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 0.87 to 0.97mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.242 to 0.293. Ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.85 to 2.076, and linear density of metal cord lies within 2.84 and 3.16 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.62 to 1.85, and breaking strength of metal cord is not lower than 9555N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyres.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker consisting of metal cord and textile layers, carcass, side strips and bead rings. Diameter of metal cord is from 0.83 to 0.91 mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.280 to 0.331. ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.978 to 2.168, and linear density of metal cord lies within 2.64 and 2/96 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.538 to 1.839, and breaking strength of metal cord is not lower than 8555N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyre.

2 dwg

FIELD: automotive industry.

SUBSTANCE: proposed pneumatic tire has crown, two side strips and two beads as well as carcass reinforcement secured in each bead and crown reinforcement provided with working unit and protective unit form inside to outside in radial direction. Protective unit contains at least one layer of parallel reinforcement circumferentially orientated elements. Layer of protective unit is formed by reinforcement elements made of aromatic polyamide with initial modulus of elasticity not less than 1000 cN/tex and breaking strength exceeding 65 cN/tex.

EFFECT: increased strength of pneumatic tire crown.

20 cl, 5 dwg

FIELD: automotive industry; tire industry.

SUBSTANCE: invention relates to tires for machines used in civil engineering. Proposed tire has radial carcass reinforcement 1 second in each bead by means of ring reinforcement member of bead and radially upper crown reinforcement containing at least two working layers of non-stretchable metal cord with intersecting threads of layers, width of said layers is at least 50% of tread width L, and radially upper two protective layers along crown made of so-called elastic metal cord with intersecting threads of layers. Tread includes, in its grooveless part of thickness D, at least one reinforcement made of strengthening members. Said reinforcement consists of at least two layers of textile monofiber whose threads are parallel in each layer. Axial width of said layers is at least equal to width of most narrow working layer.

EFFECT: increased strength of crow of pneumatic tire.

4 cl, 1 dwg

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