Tyre for heavy vehicle

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

 

The invention relates to a tire with radial reinforcement frame, designed to equip heavy vehicle such as a transport vehicle or road-building machine. In particular, it relates to a tire having an axial width greater than 37 inches.

The tire of this type, usually designed to carry heavy loads, contains radial amplification part of the frame and reinforcement of the crown zone, consisting of at least two working crown layers of the zone, which is formed of inextensible reinforcing elements, thus reinforcing elements of one layer overlap with amplifying elements of the other layer, forming equal or unequal angles, comprising 10° to 45° relatively County areas.

Amplification of part of the crown zone of the tire with a radial cord, in particular for very large tires are pronounced deformations, which lead to the appearance of longitudinal and transverse shear stresses between the edges of two overlapping layers (longitudinal shear stress more transverse shear stress, when the cords intersecting layers are located at small angles relative to the circumferential direction) simultaneously with the voltage, causing the separation of the layers, that is, the radial stress is, leading to the tendency of separation of the edges of the two layers from each other in the radial direction. These stresses are mainly caused by the internal pressure in the tire, the consequence of which is that the so-called pressure in the zone between the amplifying part of the frame and the amplifying part of the crown zone causes a rise in the specified amplification part of the crown area in the circumferential direction. In addition, the voltage due to the load that is borne by the tire while driving, once formed, the contact surface between the ground and the tire. In addition, these stresses arise because of the angle of slippage of the tires while driving. These stresses lead to the formation of cracks in the rubber adjacent to the end of the shortest layer, and these cracks propagated through this mixture, having a negative impact on the service life of the amplifying part of the crown zone and, consequently, the service life of tires.

A clear increase of the service life was achieved by the use in the amplifying part of the crown zone, at least one protective layer of the crown zone having an axial width greater than the width of the widest working layer in the axial direction.

The term "axial" refers to the direction parallel to the axis of rotation of the tire, and the term "radial" means the AET direction, intersect the axis of rotation of the tire and perpendicular to it. The axis of rotation of the tire is the axis around which the tire rotates during normal use. The ring (Equatorial) average plane is a plane perpendicular to the axis of rotation of the tire and dividing the tire into two halves. Radial plane is the plane in which the axis of rotation of the tire.

Another solution, such as described in French patent 2421742 is more favorable distribution of stresses, which lead to the separation of the working crown layers of the zones from each other and which arise because of the angle of slippage of the tires, by increasing the number of operational layers.

A significant increase in the number of operational layers also has disadvantages, in particular in the center of the amplification part of the crown zone, where the number of layers has a direct impact on the rigidity of the crown area of the tire when bending. The result of an increase this rigidity is that the bumps on the crown area of the tire, such as, in particular, when the bus moves on large stones can lead to irreparable damage to the tire as a result of this increased stiffness.

In addition, in WO 00/54992 as a way to avoid this disadvantage, it was proposed to create a working amplifier crown zone, comprising, by at least of the three continuous working layers and at least one-half layer on both sides of the Equatorial mid-plane, with this half-layer is located between the edges of at least two adjacent in the radial direction, the continuous working plies, and a special sign of his is, in particular, that it forms an angle relative to the circumferential direction, which is more than 25° 5°-15° more most of the corners, which form continuous layers. The results that were obtained with the design of this type were exceptionally good for tire size, subjected to the tests.

When performing the research and, in particular, studies related to the production of larger tires, particularly tires, the axial width of which exceeds 50 inches, was the desire to determine the design of the crown area of the tire for heavy vehicles, which enables to ensure adequate service life, in particular by improving the parameters of the stiffness in the circumferential and transverse directions to limit shear stresses while maintaining the elasticity of the crown area.

This goal was achieved in accordance with the invention using tires for heavy vehicles, containing radial amplification part of the frame, the radiation is enom direction surrounded by working amplifying part the crown area, consisting of at least two continuous working crown layers zone formed of metal reinforcing elements, with metal reinforcing elements of one layer overlap with the metal reinforcing elements of the next layer, forming angles α, α'constituting from 10about35aboutrelative circumferential direction, with a working amplifier crown zone ends on each side of the ring (Equatorial) mid-plane, at least two half-layers, the metal reinforcing members which form the corners β, β'exceeding the smallest of corners α, α', relative to the circumferential direction, with half layer, passing axially furthest to the outside, is in contact with the widest in the axial direction, continuous working crown layer zone, and two half-layers close in the radial direction axially outer end of the widest in the axial direction, the working layer.

Bus similar to the one described above and is made according to the invention, that is, having an amplifier crown area, such as described, allows to increase service life of tyres for heavy vehicles. Indeed, it was found that the proposed design of p which help reduce shear stresses while maintaining the elasticity of the tire, in particular, in its crown area that provides the ability to achieve good resistance to impact that, in turn, has a beneficial effect on the service life of the tire.

Continuous layers and working half-layers preferably consist of inextensible metal reinforcing elements, so that the function of the bonding layer frame annular reinforcing element is provided as efficiently as possible.

In accordance with a preferred embodiment of the invention, at least one of the half-layers has an area that covers the end of the narrow continuous layer of the crown zone. In accordance with the embodiment of this type, there is an opportunity to further improve the distribution of forces in the amplifying part of the crown area as a whole by optimizing connections between layers.

Also preferably, if the reinforcing members of one of the half-layers will be located at an angle of at least 10° exceeding the smallest of corners α, α'. A layer of this type, in particular, allows to increase the rigidity of the tire in a lateral direction without making a negative impact on the elasticity.

In accordance with a preferred embodiment of the invention, to increase the rigidity of the tire okruzna direction while increasing the transverse stiffness of the reinforcement elements of the half-layers overlap with each other.

In particular, to improve the resistance of the bus cuts and perforations in itself known working amplification of the crown zone of the protective ends of the reinforcement part. The latter preferably consists of at least two layers of elastic metal reinforcing elements. In various embodiments, the invention provides protective layers formed by the strips partially overlapping. Whatever type of protective layers are used, the used elastic reinforcing elements may represent items straight or in the form of a sine wave.

At least one of the protective layers, preferably radially-inner layer, has an axial width that is greater than the highest in the axial direction of the width of the continuous working plies. In addition, preferably, if the specified protective layer covers all continuous layers and working half-layers.

In accordance with a preferred embodiment of the invention, the radially outer protective layer has an axially outer end located between the axially outer end of the half-layer, passing in the axial direction at least far out, and the axially outer end of the widest continuous working layer.

Also predpochtite is) if the reinforcing elements of the protective layers intersect with each other.

Other details and preferred features of the invention will become apparent from the following descriptions are provided as examples of embodiments of the invention with reference to figures 1 to 4, in which:

- figure 1 shows a schematic radial section of the tire for road-building machinery;

- figure 2 schematically shows in radial section of the first design of the crown zone according to the invention;

- figure 3 schematically shows, in radial cross-section of a second design of the crown zone according to the invention; and

- figure 4 schematically shows, in radial cross-section of a third design of the crown zone according to the invention;

Drawings are not to scale for ease of understanding. Figure 2-4 shows only half of the design elements that are symmetrical relative to the axis XX', which shows the ring (Equatorial) the average plane of the tire.

The values of the dimensions represent theoretical values, that is, they represent the basic values that you specify in the manufacture of tires, the actual values may differ slightly, in particular, due to the uncertainty associated with the manufacturing process of tires of this type.

In addition, as for the corners, adding to the nutrient elements layers, the above values represent minimum values, i.e. values that correspond to the area of the layer that is closest to the Central axis of the tire. In fact, the angle of these reinforcing elements varies with the axial direction of the tire, in particular due to the shape of her cell.

1 schematically shows a radial section of a tire 1, generally used for building and road machines.

This tyre 1 is a great tire, in which the ratio H/S is 0.8, where H represents the height of the tire on the rim, and S represents the maximum axial width of the tire when the tire is mounted on its operating rim and inflated to the recommended her pressure.

This tire 1 includes an amplifier 2 frame consisting of a layer of inextensible metal cords made of steel, attached on each Board to wire core 3 Board for education upturned section 4, the end of which is located essentially at the location corresponding to the maximum axial width of the amplifying part 2 of the frame. The amplifying part 2 of the frame surrounded in the radial direction of the layers 5 and profiles of rubber compound 6, and behind them is an amplifier 7 crown area. Specified amplifying part 7 of the crown area is usually, in the case of the construction of figure 1, the one hand, two layers 8, 9, called working layers, and, on the other hand, of the two protective layers 10, 11. Workers layers 8, 9 are composed of inextensible steel cords running parallel to each other in each layer 8, 9, and steel cords of one layer overlap with the steel cord of the next layer with the formation of corners, which can range from 15° to 45°relative circumferential direction. The protective layers 10, 11, as a rule, consist of a metallic elastic cord, made of steel and are held parallel to each other in each layer 10, 11, when the metallic cords of the layer 10 overlap with steel cord next layer 11 forming the corners, which can range from 15° to 45°. Cords of the radially outer working layer 9 is usually crossed with cord radially inner protective layer 10. In conclusion, amplification of the crown area surrounded by the protector 12, which is attached to the two flanges 13 by means of two sidewalls 14.

Figure 2 schematically illustrates formed in accordance with the invention, the layer package 15-22, forming the working amplifier 24 of the crown area of the tire, this amplifier is surrounded by a protective amplifier part 23. Amplifying a portion of the frame and different zones of the rubber are not shown on the figure 2 or in the subsequent figures for the forgiveness of explanation of the invention.

Thus, the working amplifier 24 in the first case contains four continuous in the axial direction of the layer 15, 16, 17 and 18. These layers have corresponding theoretical values of L15, L16, L17, L18width, equal to 0.40 S0, 0,35 S0of 0,65 S0, 0,25 S0where S0- the maximum axial width of the amplifying portion of the tire carcass when the latter is mounted on its operating rim and inflated to the recommended her pressure.

These four continuous working layer formed of inextensible metal cords, which are parallel to each other in each layer 15-18, when the metallic cords of one layer 15, 17 overlap with the next layer steel cord 16, 18, forming theoretical minimum angles α15that α16that α17that α18respectively equal to +15°, -22°, +22° -22°relative circumferential direction of the tire.

Education working amplifying part of the crown zone complete in the radial direction by superimposing two half-layers 19, 20. As explained above, these two half-layers are located symmetrically with respect to the ring (Equatorial) mid-plane on the part of the "package" tires, which are not shown. These two half-layers also have inextensible metal cords which are parallel is entrusted to each other, when the metallic cords of the layer 19 overlap with steel cord layer 20 under theoretical minimum angles β19that β20which are respectively equal to -22° and +34°.

Theoretical axial distance separating the radial plane from the inner end of the half layer 19 that is closest to the specified ring (Equatorial) mid-plane, is equal to 0,07 S0.

Two half-layers 19, 20 are held in the axial direction farther outward than the widest in the axial direction, continuous working layer 17 of the continuous working plies.

Furthermore, according to this variant embodiment of the invention of figure 2 half layer 19, which is the only layer that is in direct continuous contact with the working layers 17, 18, has cords that cross with cord layer 17, in relation to which half layer 19 has the largest area of overlap.

Areas of overlap between the half layers and continuous working layers, including the area of overlap between the half layer 19 and the least extensive in the axial direction, continuous working layer 18, are large enough for the permanence of the action of forces.

In accordance with other features of the invention half layer 19, passing on the whole arujo in the axial direction, is in contact with the most extensive in the axial direction, continuous working layer 17. In addition, two half-layers 19, 20 close the axially outer end of the longest in the axial direction, continuous working layer 17.

Protective amplifier 23, which closes in the radial direction, the working amplifier 24 of the crown zone, is formed of two layers 21, 22, consisting of an elastic steel cords. These cords, which have an elongation of not less than 4%, while the traction force equal to the breaking load, referred to as elastic, while the cords is called the inextensible when their elongation, measured with a force equal to 10% of the breaking load is less than 0.2%. Cords of one layer 21 overlap with another cord layer 22, forming theoretical minimum angles respectively equal to -24° +24°relative circumferential direction. Cords protective layer 21, which is located in the radial direction closest to the working amplifying part, overlap with cord work half layer 20 located radially furthest from the amplifying part of the frame; in accordance with other variants of the invention provides the ability to change the order of the two protective layers in RA the territorial direction, while the cords of these layers are crossed with each other.

The axial width of the widest of the protective layer 21 is such that it overlaps the axial width of the work of the reinforcement part 24, that is, it closes in the radial direction all layers due to its length in the axial direction. In other words, the end of the wide protective layer 21 is in the axial direction from the outside toward the half layer 19.

The axially outer end of the narrow protective layer 22 is located between the axially outer end of the half layer 20, passing in the axial direction at least far out, and by the end of the widest continuous working layer 17.

Figure 3 shows a schematic depiction in radial cross-section of another amplifier design crown area in accordance with the invention. In accordance with this second embodiment of the invention, the package has layers 25-32, forming a working amplifier 33 of the crown area of the tire, this amplifier is surrounded by a protective amplifying part 34. Working amplifier 33 has four continuous in the axial direction of the layer 25, 26, 27 and 28. These layers have corresponding theoretical values of L25, L26, L27, L28width equal to 0.50 S0, 0,45 S0, 0,55 S0, 0,40 S 0where, as above, S0is the maximum axial width of the amplifying portion of the tire carcass when the latter is mounted on its operating rim and inflated to the recommended her pressure.

These four continuous working layer formed of inextensible metal cords, which are parallel to each other in each layer 25-28, with the metal cords of one layer 25, 27 overlap with the next layer steel cord 26, 28, forming theoretical minimum angles α25that α26that α27that α28respectively equal to +18°, -24°, +20° -20°relative circumferential direction of the tire.

Education working amplifying part 33 of the crown zone complete in the radial direction by superimposing two half-layers 29, 30. As explained above, these two half-layers are located symmetrically with respect to the ring (Equatorial) mid-plane on the part of the "package" tires, which are not shown. These two half-layers also have inextensible metal cords that are parallel to each other, when the metallic cords of the layer 29 overlap with steel cord layer 30 under theoretical minimum angles β29that β30which are respectively equal to -23° and +34°.

Theoretical axial distance separating the radial plane from the inner end of the half layer 29, closest to the ring (Equatorial) mid-plane, 0.10 S0.

Protective amplifier 34, which overlaps in the radial direction, the working amplifier 33 corona zone, is identical to the corresponding parts in figure 2 and is formed by layers 31, 32.

When compared with figure 2 shows that the design of figure 3 has a continuous layers which are wider, at least with regard to layers 25, 26, 28. This structural difference is the result, in particular the increase of the contact surfaces between the continuous working layers and working half-layers. This increase of the contact surfaces between the layers helps to give the tire more resistance to the forces that arise because of the angle of slip.

This design also provides better traction in the Central zone than in the case of the construction of figure 2.

Furthermore, the design shown in figure 3, provides the possibility of increasing the elasticity of the crown area in the center, because half the layer 29 is held farther from the ring (Equatorial) mid-plane than half the layer 19 in figure 2.

Figure 4 shows a schematic depiction in radial cross-section of a third design of the crown zone in accordance with the invention. In accordance with this third embodiment izopet the Deposit package has layers 35-40, forming a working amplifier 41 of the crown area of the tire, this amplifier ends of the protective amplifying part 42.

Working amplifier 41 includes two continuous in the axial direction of the layer 35 and 36. These layers have corresponding theoretical values of L35and L36width is 0.45 S0and 0.65 S0where, as above, S0is the maximum axial width of the amplifying portion of the tire carcass when the latter is mounted on its operating rim and inflated to the recommended her pressure.

These two continuous working layer formed of inextensible metal cords, which are parallel to each other in each layer 35 and 36, when the metallic cords of one layer 35 overlap with steel cord next layer 36, forming theoretical minimum angles α35and α36accordingly equal to -15° +24°relative circumferential direction of the tire.

Education working amplifying parts 41 of the crown zone complete in the radial direction by superimposing two half-layers 37, 38. As explained above, these two half-layers are located symmetrically with respect to the ring (Equatorial) mid-plane on the part of the "package" tires, which are not shown. These two half-layers also have erastai the haunted metal cords, which are parallel to each other, when the metallic cords of the layer 37 overlap with steel cord layer 38 under theoretical minimum angles β37that β38which are respectively equal to -18° and +34°.

Theoretical axial distance separating the radial plane from the inner end of the half layer 37 closest to the ring (Equatorial) mid-plane, is equal to 0.08 S0. Protective amplifier 42 that overlaps in the radial direction, the working amplifier 41 of the crown zone, is identical to the corresponding parts in the previous two examples and formed layers 39, 40.

The essential difference from the two examples above is that the design of the crown area only includes two continuous working layer. This variant of the invention allows to maintain a higher elasticity in the center of the crown area of the tire than in the previous cases.

These examples should not be interpreted as restrictive, and there are numerous varieties of embodiments of the invention. In particular, there is a possibility of placement of workers, half layers between the continuous working plies. It is also possible to provide three continuous working plies. In addition, there is a possibility of the ISM is in the orientation of the cords protective layers on the opposite.

1. Tyre for heavy vehicles containing radial amplification part of the frame, surrounded in the radial direction of the working amplifier crown area containing at least two continuous working crown layer area formed of metal reinforcing elements, with metal reinforcing elements, crossed from layer to layer, forming angles α, α'comprising from 10 to 35° relatively district direction, characterized in that the working amplifier crown area ends on each side of the circumferential mid-plane, at least two half-layers, metal reinforcing members which form the corners β, β'exceeding the smallest of corners α, α', relative to the circumferential direction, half layer, passing axially furthest to the outside, is in contact with the widest in the axial direction of the continuous working crown layer zone and two half-layer cover in the radial direction axially outer end of the widest in the axial direction of the working layer.

2. The tire according to claim 1, characterized in that the continuous layers and working half inextensible layers contain metal reinforcing members.

3. Tire according to any one of claims 1 and 2, characterized in that at least Odie is of the half-layers has an area, closing the end of the narrow layer of the crown area.

4. The tire according to claim 1, characterized in that the reinforcing members of one of the half-layers are angled at least 10° exceeding the smallest of corners α, α'.

5. The tire according to claim 1, characterized in that the amplifying elements of the half-layers overlap with each other.

6. The tire according to claim 1, characterized in that the working amplifier crown area ends protective amplifying part containing at least two layers of elastic metal reinforcing elements.

7. The tire according to claim 6, characterized in that the protective layer has an axial width greater than the width of the widest in the axial direction of the working layer.

8. Tire according to any one of p and 7, characterized in that the radially outer protective layer has an axially outer end located between the axially outer end of the half-layer, passing in the axial direction at least far out, and the axially outer end of the widest continuous working layer.



 

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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

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