Pneumatic tire with an aspect ratio h/s0,6

 

(57) Abstract:

The invention is intended for use on vehicles, mostly trucks, buses, trailers. Fittings ridge pneumatic tire formed with a layer of metal cord threads oriented at least at an angle of 60o, the two working layers of the ridge, formed of inextensible metal cord threads oriented at an angle in the range from 10 to 45obetween which are inserted the first additional layer of metallic elements oriented parallel to the regional direction of the pneumatic tire, and a second additional layer is located on each side of the pneumatic tire in the radial direction over the outer working layer and essentially centered on the end of the first additional layer. This increases the service life of pneumatic tires. 5 C.p. f-crystals, 2 Il.

The invention relates to a pneumatic tire with a radial reinforcement of the frame, are fixed in each Board for at least one bead ring and containing a valve of the ridge formed by at least two so-called working layers superimposed on one another and Stormo layer to another, forming with the circumferential direction of the pneumatic tire angles not exceeding 40oin absolute value.

More precisely, the invention relates to pneumatic tires for heavy trucks and other heavy vehicles, with the ratio of the height to the rim h of the maximum width in the axial direction S, not exceeding 0,60, and intended for use on vehicles large or medium tonnage, such as trucks, buses, car trailers, etc.

Currently, it is widely known use in the pneumatic tire valve of the ridge formed by the so-called working layers formed of cord yarns, forming with the circumferential direction of some angle, and additional layers formed from cord yarns oriented essentially in the circumferential direction. An example of such construction is shown and described in U.S. patent US 3677319, and layers formed of metallic elements oriented at angles in the range 18oup to 75owhile additional layers are formed of textile cord filaments oriented at an angle 0o. Such structure allows to reconcile the PR is gay and comfort when driving, resistance to wear and resistance to rolling. Mentioned additional textile layers can be located either under the layers of metal cords, or over them, or between these layers, and the width of the system of layers of textile fabric, has a value in the range from 25% to 75% of the width of the metal structure.

French patent FR 2419185 clarifies that the pneumatic tire of the type in question with a relatively small value of the ratio H/S, although it has numerous advantages, however, has several disadvantages. These include, for example, satisfactory adhesion of the Equatorial zone of the tread or the localization of high pressures in the region of the edges of this treadmill associated with a decrease in contact surface in the longitudinal direction of the pneumatic tire. To eliminate the mentioned disadvantages in the French patent, it is suggested to place between the valve frame and the inner radial direction of the working layer, two spaced apart zones of the Equatorial plane, two sets of constraints, each of which is formed by two superimposed on each other by layers of inextensible cord yarns, crossing from about the size of half of the smallest angle, used in the working layers and different from the 0o.

To increase the armature resistance of the crest of the pneumatic tire for heavy vehicles with a value of the form factor, not more than 0.6, there is no satisfactory technical solutions and the problem of resistance, current to pneumatic tires of the type in question, it becomes very acute, because lack of persistence is determined by the lack of resistance to separation between the ends of the layers of the ridge and insufficient fatigue strength of the cord threads of the plot reinforcement frame meridianal profile which is parallel to the profile of the reinforcement ridge, as well as poor resistance to separation between the valve cage and valve crest.

To increase the stability in the application WO 96/20095 described the valves of the ridge containing at least two working layers of the crest of the inextensible cord yarns, crossed from one ply to the other and forming with the circumferential direction angles in the range from 10o45oand mentioned layers have a width that does not exceed 80% of the maximum axial width SO the valve frame. The proposed solution differs in that the lock is continuous in the axial direction of the layer, formed of inextensible metal cord threads, forming with the circumferential direction an angle at least equal to 60oaxial width which is at least equal to the axial width of the shortest working layer of the ridge, between the two working layers of the ridge is an additional layer formed of metallic elements, which are oriented essentially parallel to the district direction, and the axial width of the mentioned layer is at least equal to 0.7 and SO the value of the modulus of elasticity in tension does not exceed the value of the same module for the most extensible working ply.

Despite the realized progress, such a pneumatic tire with an aspect ratio H/S not to exceed 0,45 (where H represents the height of the pneumatic tire at the destined operational rim, a S represents its maximum axial width), and is intended to replace the system of two coupled pneumatic tires on the axles must be improved from the point of view of the total resistance. In particular, a pneumatic tyre should be improved in terms of resistance to separation between the valve casing and the valve GrEbner CLASS="ptx2">

It would be logical to assume that the modification of the structure should cover two areas where the ends of the layer cord yarns oriented at an angle at least equal to 60oand the ends of the working layer, and that the best technical solution that can resolve the existing dual problem, will be to increase the width of the layer of circumferential cord threads.

However, it has been unexpectedly discovered that if indeed it is necessary to increase the number of circumferential cord yarns, this increase should not be performed by the expansion of the layer of circumferential cord yarns, and must be performed by adding a second additional layer of circumferential cord yarns small axial width, located in the radial direction on the second working layer, that is, in continuation, respectively on each side of the armature of the ridge, the most outside in the radial direction of the layer elastic cord yarns, or so-called protective layer, and covering the ends of the layer of circumferential cord yarns.

Thus, the pneumatic tire in accordance with the invention contains radial reinforcement of the frame, over which is located the valve crest, the content is to the other and forming with the circumferential direction angles in the range from 10o45oand mentioned layers have a width, comprising at least 80% of the maximum axial width SO the valve frame, and between the valve frame and the closest in the radial direction to the axis of rotation of the working layer is continuous in the axial direction of the layer formed of inextensible metal cord threads, forming with the circumferential direction an angle at least equal to 60oaxial width which is at least equal to the axial width of the shortest working layer of the ridge, and between the two layers of the ridge is the first additional layer formed of metallic elements, which are oriented essentially parallel to the district direction, and the axial width of the mentioned layer is at least equal to 0.7 and SO the value of its modulus of elasticity in tension does not exceed the value of the same module for the most extensible working ply.

Pneumatic tire according to the invention is characterized by the fact that in the radial direction over the most outside in the radial direction of the working layer of the ridge and on each side of the pneumatic tires is the second additional layer formed of the metal elements of the guidelines is that he covers in the radial direction of the end of the first additional layer of circumferential cord yarns, located between the two working layers.

The phrase "inextensible cord thread" should be understood cord thread, made for example of steel, which has an elongation of less than 0.2% when the application 10% of breaking load.

Cord thread or wire, oriented essentially parallel to the district direction, represent the threads or wires which form with the said direction angles in the range from +2.5 toobefore -2,5o.

The modulus of elasticity tensile cord layer filaments is a tensile stress acting in the direction of the cord yarns and necessary to provide the specified elongation , and modulus represents the shear modulus. Under the elastic modulus of an additional layer, not exceeding the same module for the most extensible working layer, it should be understood that the shear modulus of an additional layer in any relative elongation does not exceed the tangent module is the most extensible working layer at any relative elongation and the tensile layer is a layer which for each value of tensile stress and aviaudio voltage.

Preferably the modulus of elasticity of the second additional layer is equal to the modulus of elasticity of the first additional layer, has a small value relative elongation in the range from 0% to 0.4% and does not exceed the highest value of the modulus of elasticity in tension for the most extensible working layer with a relative movements in excess of 0.4%.

In the above-described part of these additional layers may be formed of so-called elastic cord thread representing a curve of tensile stress in the function of relative elongation with a small slope for small relative movements and essentially constant and large enough slope for higher values of relative elongation. These additional layers can also be formed of cord threads oriented in the circumferential direction and is cut in such a way as to form segments, the length of which is substantially less than the circumference least long layer, but in the preferred implementation exceed 0.1 of the length of said circle, and the ends of these sections are displaced relative to each other in the axial direction. This method of implementation allows sufficient additional layer has a width, centered on the end of the first additional layer, so that his own ends has been removed in the axial direction from the end of the first additional layer of at least 10 mm, and the small width of this layer has a value in the range from 15 to 50 mm

In a preferred embodiment, the second additional layer continues in the axial direction of the outer most radial direction of the so-called protective layer and formed of elastic cord filaments, forming with the circumferential direction an angle in the same direction and substantially the same magnitude as the angle to be working layer, and the continuation occurs between the inner axial end of the additional layer and the outer axial end of the layer of elastic cord yarns of a small interval of width not exceeding 5 mm

Other characteristics and advantages of the invention will be better understood from the following description with reference to the accompanying drawings, in which:

Fig. 1 depicts a meridianal incision reinforcement ridge pneumatic tire according to the invention;

Fig. 2 - the internal design of the valve of the ridge mo who meet the aspect ratio H/S, is 0.45, and H is the height of pneumatic tyres R at the destined mounting rim and S is the maximum axial width of the pneumatic tire. Pneumatic tyre R contains radial reinforcement frame (1), fixed in each Board on at least one side of the ring, forming a turnover, and formed a single layer of metal cord threads. The valve frame (1) is tightened around the circumference of the armature ridge (3) formed in the radial direction from the inside out:

the first layer (31) of inextensible metal cord yarns oriented in relation to the district direction at an angle equal to 65o. The function layer is to absorb a large part of the effort axial compression, which may be the armature of a radial carcass (1);

the first working layer (32) formed of inextensible metal cord threads oriented at an angle of , in this case the value of the 18oand located in the radial direction over and covering the previous so-called triangular layer;

the first additional layer (33), located on top of the first working layer (32) and is formed of inextensible metal elements, OK the Ana at an angle 0o;

the second working layer (34) formed of a metal cord threads, identical to the cord threads of the first working layer (32) and forming with the circumferential direction an angle opposite the corner and this case equal in absolute value component of the 18o(but the magnitude of this angle may be different from the magnitude of the said angle );

the last layer is the so-called elastic cord yarns oriented in relation to the district direction at an angle in the same direction as the angle , and equal to this angle , but in some cases differing in the magnitude of said angle, and this layer is a protective layer;

and, finally, a second additional layer (36) on each side of this pneumatic tire formed of inextensible metal elements whose length in the circumferential direction essentially equal to 1/6 of the circumferential length of the layer (33), and these elements are oriented at an angle 0othen there are the elements identical to the elements of the first additional layer (33).

The axial width L32 of the first working layer (32) is 0,87 of the maximum axial width SO the middle layer of the reinforcement frame (1) or 416 is rotector, which is the version under consideration 430 mm

The axial width L34 second working layer (34) is 0.8 times the maximum axial width SO or 400 mm

Triangular layer (31) has an axial width L31, equal to the average of the widths of the two working layers (32) and (34), which in this case is 408 mm

With regard to the axial width L33 of an additional layer (33), at least equal to 0.7 SO, it in this case is 350 mm, which is equivalent to 0.73 SO. Indeed, width L33 of an additional layer (33) is less than the width L32 (or L34) the least wide working layer, but not much less than the aforementioned width so that effectively contribute to reducing the temperature of operation of the pneumatic tire in the vicinity of the ends of the working layers of the ridge, which are the areas most prone to heating and separation of the layers.

The last layer of the ridge (35), the so-called protective layer has a width L35, somewhat smaller than the previous value of the width of the above-mentioned layers, or 320 mm

As for the width L36 layer (36), it is in the present implementation has a value of 25 mm and is such that its circumferential axis of Simmerring in the axial direction by the end of the layer (36) and the end of the so-called protective layer (35) is in this case 2.5 mm

The modulus of tensile elasticity for the working layer (32) or the working layer (34), are identical in the present case, because they are formed by the same tight inextensible metal elements 27.23 continuous throughout the width of the layer, and mentioned cord thread are one and the same step, i.e. with the same distance between the cord threads, is 5300 Dan/mm2when the relative elongation of 0.4%. The modulus of elasticity in tension, measured under the same conditions for the so-called triangular layer (31) formed of drawn metal cord threads 9,23 is 6925 Dan/m2. As for the two additional layers (33) and (36), they formed tight metal cord threads 27,23, cut in such a way as to have the parcels cord yarns, circumferential length which is 1/6 of a circumferential length of the first least long layer (33), which gives these two layers common tangent modulus of tensile elasticity, comprising 3310 Dan/mm2for a relative elongation of about 0.4%.

Additional layers (33) and (36) can also be formed so-called two-elastic cord threads, i.e. cardname relative elongation from tensile forces, representing two parts with significantly different slopes, curve type (17), shown in Fig.2 of French patent FR 1188486. Because of the low elasticity layer (33) and (36) is only useful in the molding process of this pneumatic tire vulcanizing form, cord, thread, representing small modulus of elasticity in the initial state at a relative elongation of about 0.4% and the modulus of elasticity, for example, exceeding 14000 Dan/mm2for higher values of relative elongation, making it easy to get the layers of cord strands, oriented essentially at an angle 0ohaving a relative elongation in excess of 0.4%, a modulus of elasticity of about 5200 Dan/mm2.

The above-described pneumatic tire has been tested in respect of its share, compared to control pneumatic tire of the type described in the above-mentioned international application. In a similar loading conditions (variable load, increasing step by step starting with 5800 kg) and pressure (adjustable pressure up to 10 bar) control pneumatic tires made a run in the 11500 miles on the test drum (average of two test results), whereas pneum the results of 5 trials), that is a very significant improvement.

1. Pneumatic tyre R containing radial reinforcement frame (1), over which is located the valve (3) crest, containing at least two working layers (32, 34) of the crest of the inextensible cord yarns, crossed from one layer (32) to another layer (34) and form relative to the circumferential direction angles , the value of which is in the range from 10 to 45oand the layers have a width L32, L34, at least equal to 80% of the maximum axial width SO the valve frame, and between the reinforcement frame (1) and the working layer (32), the closest in the radial direction to the axis of rotation is continuous in the axial direction of the layer (31) formed of inextensible metal cord threads, forming with the circumferential direction an angle at least equal to 60oand the axial width of this layer L31 is at least equal to the axial width L32, L34 the shortest working layer (32, 34) of the ridge, and between the two working layers (32) and (34) is the first additional layer (33) formed of metallic elements oriented essentially parallel to the district direction, and the axial width L33 mentioned layer of at least RA is for the most extensible working layer (33, 34), characterized in that in the radial direction over the outside in the radial direction of the working layer of the ridge (34) and on each side of the pneumatic tire P is the second additional layer (36) formed of metallic elements oriented parallel to the district direction having a small width L36, centered on the end of the first additional layer (33) in such a way that his own ends are separated by at least 10 mm from the end of the first additional layer (33) located between the two working layers (32, 34).

2. Pneumatic tyre under item 1, characterized in that the modulus of tensile elasticity of the second additional layer (36) is equal to the modulus of tensile elasticity of the first additional layer (33).

3. Pneumatic tyre under item 2, characterized in that the overall modulus of additional layers (33, 36) is relatively small for a relative elongation in the range from 0 to 0.4% and does not exceed the modulus of tensile elasticity, with the highest value for the most extensible working layer with a relative movements in excess of 0.4%.

4. Pneumatic tyre on p. 3, characterized in that additional layers (33, 36) formed elongation, with a small tilt to small relative movements, which are located in the range from 0 to 0.4%, and significant and essentially constant slope for higher values of relative elongation.

5. Pneumatic tyre under item 3, wherein the additional layers are formed of cord yarns oriented in the circumferential direction and is cut in such a way as to form sections of a length substantially less than the circumference least long layer (33), and the cuts between sections are displaced relative to each other in the axial direction.

6. Pneumatic tire according to any one of paragraphs.1-5, characterized in that the reinforcement ridge (3) further comprises the most outside in the radial direction of the protective layer (35) formed of elastic cord yarns, forming with the circumferential direction an angle in the same direction and the same magnitude as the angle of the underlying layer (34), while the second additional layer (36) has a width in the range from 15 to 50 mm and continues in the axial direction of the protective layer (35) through the interval value of less than 5 mm between the inner axial end of the additional layer (36) and outside in the axial direction by the end of the layer (35) ELAST

 

Same patents:

Pneumatic tyre // 2120388

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

The invention relates to pneumatic tires and, in particular, to the design of the tread of the tires of radial construction

The invention relates to the tire industry, namely, pneumatic tyres, used on various propulsion units

FIELD: automatic industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 1.14 to 1.26 mm. Metal cord proper is made of equal-diameter metal threads, ratio of metal thread diameter to diameter of metal cord being from 0.253 to 0.298. Ratio of breaker metal cord pitch to diameter of metal cord is from 1.9 to 2.25, and linear density of metal cord lies within 5.0 and 5.5 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 0.35 to 1.49, breaking strength of metal cord being not lower than 1715±5N.

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

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 0.87 to 0.97mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.242 to 0.293. Ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.85 to 2.076, and linear density of metal cord lies within 2.84 and 3.16 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.62 to 1.85, and breaking strength of metal cord is not lower than 955±5N.

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

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker consisting of metal cord and textile layers, carcass, side strips and bead rings. Diameter of metal cord is from 0.83 to 0.91 mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.280 to 0.331. ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.978 to 2.168, and linear density of metal cord lies within 2.64 and 2/96 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.538 to 1.839, and breaking strength of metal cord is not lower than 855±5N.

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

2 dwg

FIELD: automotive industry.

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

EFFECT: increased strength of pneumatic tire crown.

20 cl, 5 dwg

FIELD: automotive industry; tire industry.

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

EFFECT: increased strength of crow of pneumatic tire.

4 cl, 1 dwg

FIELD: tire industry.

SUBSTANCE: invention relates to design of automobile tires, particularly to those used in construction vehicles. proposed reinforcement pack N of pneumatic tire contains reinforcement member embedded in converting materials and it includes first layer C1 and second layer C2 of metal elements E1, E2 parallel to each other and embedded into covering materials M1, M2 and third layer C3 of elements E3 made of textile material is placed between two layers C1 and C2, third layer being embedded into covering material M3. Textile elements E3 are orientated relative to elements E1 and E2 at angle within 70° and 110°.

EFFECT: increased strength of tires.

7 cl, 4 dwg

FIELD: tire industry.

SUBSTANCE: invention relates to tire with radial reinforcement of carcass for use on heavy vehicles, such as transport or construction and road-building machines. It relates to tire with axial width exceeding 37 inches. According to invention, tire has working reinforcement crown consisting of at least two uninterrupted working layers and terminating from each side of circumferential (equatorial) middle plane in at least two half-layers whose metal reinforcement members form angles exceeding minimum angle which is formed by reinforcement members of uninterrupted layers relative to circumferential direction. Half-layer passing in axial direction outwards further than other half-layers is in contact with widest in axial direction uninterrupted layer in crown, and two half-layers cover in radial direction axially outer end of said working layer widest in axial direction.

EFFECT: increased service life of tire.

8 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Air tire has breaker structure that comprises first breaker layer (51), second breaker layer (52) arranged in radial-inner position relative to first breaker layer (51), third breaker layer (53) arranged in radial inner position relative to first (51) and second (52) breaker layers. Every breaker layer (51, 52, 53) comprises multiple elongated reinforcing elements arranged above 1st, 2nd and 3rd breaker angles. Note here that 1st and 2nd angles vary from 15 to 40 degrees. Second angle has opposite sign relative to 1st breaker angle. Third breaker angle features magnitude varying from 40 to 90 degrees and opposite sign with respect to second angle. Breaker structure comprises also breaker layer (54) arranged at zero degree angle relative to 1st breaker layer (51) comprising elongated reinforcing elements arranged to make, in fact, zero breaker angle,.

EFFECT: perfected performances.

21 cl, 11 dwg

Tire case // 2422291

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to design of truck radial tires. A case contains tread, breaker consisting of metal-cord and textile layers, casing, sidewalls and bead rings. Metal cord diameter is 0.77-0.85 mm. The metal cord itself is made of metal fibers with equal diameter, and the ratio of metal fiber to metal cord diameter is 0.330-0.410. The ratio of metal cord in rubber-covered breaker layer to metal cord is 2.057-2.743, and linear density of metal cord lays within the range of 2.12-2.34 g/m. Herewith, the thickness of each rubber-covered metal cord layer in breaker is 1.25-1.45 mm, and tensile strength of metal cord is not lower than 875±5 N.

EFFECT: material, labor and energy consumption of tire manufacturing is lowered.

2 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Proposed tire features ellipticity factor equal to or under 50%. Breaker layers 9, apart from outer breaker layer 10, are arranged so that breaker layer cords are arranged at θ 10-70° relative to tire lengthwise direction. Said outer breaker layer 10 is made of coiled layer 12 of coiled tape provided with steel cords in tire lengthwise direction. Said breaker layer 10 comprises section 10A located between fold position Po on opposite sides from tire equator and fold position 10B bent in U-like manner from position Po toward tire equator. Section 10A features width varying from 70% to 80% of width of contact between tread and ground while fold section 10 B has width varying from 5.0 mm to 0.5 of width.

EFFECT: longer life.

9 cl, 8 dwg

Up!