Fittings ridge pneumatic tyres

 

The invention relates to the automotive industry, in particular intended for heavy vehicles or wheeled road construction equipment. The armature of the ridge formed by the two working layers of the ridge, formed of inextensible reinforcing elements forming with the circumferential direction anglesandand having an axial width, the value of which is in the range from 0.65 to 0.80 and So from 0.35 to 0.45 So, where So is the maximum axial width of the middle line of the valve frame. There are at least two polsloe formed metal inextensible reinforcing elements forming with the circumferential direction an anglewhose value is less than the smallest of the anglesandat least on the 2oand the direction of which is opposite to the direction of the anglethe orientation of the reinforcing elements of the most extensive and continuous in the axial direction of the layer. Polsloe are located on either side of the Equatorial plane and have an axial width, the value of which is dastane, equal to half the width of the least wide working layer, reduced by an amount at least equal to 0.05 So. This increases the rigidity of the reinforcement of the ridge and as a consequence the reliability of the tires. 4 C.p. f-crystals, 2 Il.

The present invention relates to pneumatic tires, for which the shape factor H/S does not exceed 0.80, or pneumatic tires of the type "Poids-Lourds" or "Genie Civil", i.e. pneumatic tyre for heavy vehicles or wheeled road construction equipment.

A pneumatic tire is designed to carry heavy loads, contains radial armature armature and the armature of the ridge formed at least two working layers of the ridge, formed of inextensible reinforcing elements, crossed from one ply to the other and forming with the circumferential direction of the same or different angles, typically having a size in the range from 10 to 45o.

When increasing the axial width S of the pneumatic tire without increasing the Equatorial diameter and seats of the rim, that is, while maintaining the height H of the pneumatic tire on the rim, the contact surface of the pneumatic tires with flat and horizontal operating valve crest, resistant attached thereto tensile stresses.

The contact surface with the road surface extends in the axial direction, but decreases in the longitudinal direction. This decrease in the longitudinal direction contains more pronounced narrowing in the Equatorial zone, and narrowing up to the implementation of the connections between the front and rear edges of the contact surface and the subsequent separation of contact surfaces on the two surfaces that are symmetric with respect to the longitudinal axis of the tread.

Despite the benefits that represent a broad cross-country tread and the shape factor of H/S is less than one, in particular pneumatic tires for passenger cars, the unusual shape of the contact surface of a pneumatic tire with an aspect ratio less than 0,80 has many disadvantages for the pneumatic tires of vehicles due to unevenness in the axial direction of the radial deformations of the system formed by the reinforcement frame pneumatic tyres and working reinforcement of the ridge, under the action of mechanical stresses associated with the pressure of inflation.

The mentioned disadvantages are of different nature and concern as resistance armutszeugnis impacts from soil (wear, damage, punctures, shock, and so on).

To have a favorable impact on reducing the contact surface in the longitudinal direction and the lack of resistance of the armature of the ridge, in French patent FR 2 418 185 proposed to be placed between the valve frame and the inner radial direction of the working layer of reinforcement ridge in two zones, different from the Equatorial plane, two sets of constraints, each of which is formed by two stacked on top of other layers of inextensible cord yarns, crossed from one layer to the next, forming with the circumferential direction opposite corners that do not exceed the absolute value of half the smallest angle used in the working layers, and distinct from the 0o.

The technical solution proposed in the patent, can further increase the service life of pneumatic tires, and in this case, increasing the resistance to separation between the working layers at the level of their ends, and the layers of blocks limiters are not subject to division, but there is a significant circumferential contraction, leading to the risk of cord compression threads operational layers when deflated tire.

High resistance to wear pneumatic tyres with m, is written in U.S. patent US 4934429. Unlike previous patent, U.S. patent used metal inextensible cord thread, the orientation angle of which with respect to the district direction may be equal to zero, and the additional reinforcement formed of at least one layer consisting of two parts located on either side of the Equatorial plane, and the degree of elongation of the cord yarns is chosen in function of the required modules stretching for one or more reinforcement layers and layers of comb.

The presence of additional reinforcement, formed of reinforcing elements, which is the district or slightly tilted with respect to the district direction, is not the best technical solution for forming the armature in the axial direction in relation to the stiffness of the reinforcement ridge, the contact pressure with the road surface and/or slide between a treadmill tread and the road surface.

The present invention is the creation of a reinforcement ridge pneumatic tyres, having a rigid reinforcement of the ridge, providing contact pressure with the road surface and/or slide between a treadmill tread and the road is the solution of these tasks, formation and structure of the working armature ridge pneumatic tyres.

Pneumatic tire in accordance with the invention, having a shape factor less than 0,80 contains radial valve frame formed of at least one layer of metal inextensible reinforcing elements, on top of which in the radial direction is working valves of the ridge formed by at least two working layers of the ridge, solid or continuous in the axial direction and formed of inextensible metal reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction anglesandwhich size is in the range from 10 to 45othe tire is characterized by the fact that the two working layers have an axial width that is at intervals of 0,65 - 0,80 So and 0,35 - 0,45 So, and the amount So represents the maximum axial width of the middle line of the valve frame and the working valve crest is augmented by two palosaari, formed of inextensible metal reinforcing elements forming with the circumferential direction an anglemagnitude of which is smaller than the smallest saprolegnia which is opposite to the direction of the angleorientation the most extensive and continuous in the axial direction of the working layer, and polsloe are located on either side of the Equatorial plane with the values of the axial width in the range from 0.22 to 0.35 So, with their inner axial ends distant from the Equatorial plane at a distance equal to half the width of the least wide working layer, reduced by the amount of at least 0.05 is So.

Two layers, continuous in the axial direction and formed of elements oriented at anglesandare most similar in the radial direction to the valve frame, and least wide layer preferably is closest to the outside in the radial direction reinforcement layer frame, with the least wide layer contains reinforcing elements oriented at an angle of minusor to the left.

Outside in the radial direction from above the working valve containing two continuous in the axial direction of the layer of reinforcing elements and the first two polsloe attached two other proslots these polusaev and overlapping with the reinforcing elements of two lower in the radial direction of polusaev, forming with the circumferential direction an anglethat exceeds the greater of anglesandcontinuous in the axial direction of the layers and greater than the anglethe reinforcing elements of the first two polusaev at least 10o.

The inner axial ends of two polusaev elements oriented at an angleare separated from the Equatorial plane by a distance equal to half the width of the widest continuous in the axial direction of the working layer, reduced by the amount of at least 0.05 is So.

The outer axial ends of polusaev elements oriented at an anglecan be located outside in the axial direction from the outer axial ends of the two polusaev anglebut in the preferred embodiment, the implementation of its distance from the Equatorial plane at a distance not exceeding the distance that separates the outer axial ends of the layers with an anglefrom the plane.

Features and benefits of the proposed subramaniapuram meridional cross-section of the valve crest in accordance with the invention; Fig.2 is a longitudinal section of another variant of implementation of the armature crest in accordance with the invention.

Pneumatic tyre R (Fig.1) is the shape factor H/S, amounting to 0.50, and here H is the height of the pneumatic tire on the rim and S represents the maximum axial width of the tire when it is installed on the operating rim and inflated to recommended to her pressure.

Pneumatic tyre R contains radial valve frame formed of a single metal layer 1 inextensible cord yarns, fixed in each Board on at least one side of the ring (not shown).

On top of layer 1 and outside from it in the radial direction is working valves of the ridge 3, and one or more protective layers (not shown).

The working valve contains two working layers 31 and 32, continuous in the axial direction and having a width L31 and L32, respectively, and the least wide layer 32 in the described embodiment, is closest to the valve frame in the radial direction. Width L31 and L32, respectively, equal to 0.72 and So 0,41 So.

Two layers 31 and 32 formed of inextensible metal reinforcing elements stored is the managing pneumatic tire angle, equal 22o.

Outside in the radial direction at the edges of the widest layer 31 are two polsloe 33, formed of the same metal inextensible reinforcing elements, as the elements that form the layers 31 and 32, with reinforcing elements parallel to each other in each polsloe and overlap with elements of the most extensive and continuous in the axial direction of the layer 31, forming with the circumferential direction an angleless than the angleand constituting 18o.

The axial width L33 of each polsloe 33 equal 0,29 So, and the inner axial end of polsloe 33 is located at such an axial distance from the Equatorial plane XX', that there is some overlap between the inner axial edge of the floor layer 33 and the outer axial edge of the second continuous in the axial direction of the layer 32, the least wide and inside in the radial direction. The edge of polsloe 33 is located in the radial direction over the edges continuous in the axial direction of the layer 32 and the width of the overlap is 0.06 So.

Two other polsloe 34 complement the working armature 3. These polsloe are arranged in the radial direction above layers 31, 32, 33, parallel to each other in each polsloe 34 and intersecting with the cord threads of the first polsloe 33 adjacent thereto in the radial direction, forming with the circumferential direction an angle constituting the 34o.

The inner axial end of the second polsloe 34 is separated from the Equatorial plane XX' at a distance of 0.30 So that you can ensure overlap value 0,06 So with outer axial edge of the most extensive and continuous in the axial direction of the layer 31.

The outer axial end of each of the second polsloe 34 is separated from the Equatorial plane by a distance not greater than the distance separating the outer axial end of each of the first polsloe 33 from the plane. In the described embodiment, the outer end of polsloe 34 moves towards the inside in the axial direction from the end of the first polsloe 33 by a distance equal to 0.01 So. The axial width of each of the second polsloe 34 in this case is 0.125 So.

If we consider the crest of the pneumatic tire in the direction of the Equatorial plane XX' to the outside in the axial direction of the end of the working valve 3, which in the described embodiment is an outer axial end punitorily plane to the inside in the axial direction of the end of the first floor layer 33, has an axial width, component 0,145 So, and contains two layers of reinforcing elements with angular configuration (-22o, +22o), crossed from one layer 32 to another layer 31; b) a second zone, which is from the inside in the axial direction of polsloe 33 to the outside in the axial direction of the end of the least wide and continuous in the axial direction of the layer 32 has an axial width, component 0,06 So, and contains three layers of reinforcing elements, representing the angular configuration (-22o, +22o, -18o); (C) a third zone, which is, from the outside in the axial direction of the end of the least wide and continuous in the axial direction of the layer 32 to the inside in the axial direction of the end of the second polsloe 34, contains two layers of reinforcing elements with angular configuration (+22o, -18o) and has a width 0,095 So; (d) a fourth area, which is located from the inner axial end of the second polsloe 34 to the outside in the axial direction of the end of the most extensive and continuous in the axial direction of the layer 31 has an axial width of 0.06 and So contains three layers of reinforcing elements with angular configuration (+22o, -18o, +34o); (e) a fifth area, which is located on the axial direction end of the second polsloe 34, has in the described embodiment, the width 0,065 So and formed of reinforcing elements with angular configuration (-18o, +34o); (f) finally, the sixth zone in which there is only one outer axial edge of the first polsloe 33 having a width of 0.01 So.

In Fig. 2 schematically shows a second embodiment of the valve of the ridge 3 in accordance with the invention. Fittings crest differs from that described above and shown in Fig.1 valve only location in the radial direction of the working layers and polusaev accompanied by changes in values and the angular orientation needed in order to have the same zone stiffness, as described above.

Thus, the least extensive and continuous in the axial direction of the layer 32 remains working layer, closest to the valve frame 1, and its reinforcing elements oriented at an angle of 20o.

At the edges of the layer 32 are first polsloe 33, with the inner axial end of each polsloe 33 is located at a distance from the Equatorial plane XX', so he had to overlap with the outer axial edge of the least wide and continuous in the axial direction of the layer 32, the most near directly posted by the most extensive and continuous in the axial direction of the layer 31, reinforcing elements oriented at an angle +20o. Reinforcing elements of each polsloe 33 overlap with the supporting elements of the most extensive and continuous in the axial direction of the layer 31 and oriented in the same direction as the reinforcing elements of the least wide layer 32, forming with the circumferential direction an angle -18o.

In the same way as in the case described above, two polsloe 34 complement the working armature ridge 3, and the reinforcing elements of the layer are oriented at an angle +34oto cross with the supporting elements polusaev 33.

The axial width of the working layers in the second embodiment, the implementation is the same as in the example described above with reference to Fig.1. The same can be said about the axial width of the circumferential zones of different hardness, described in the first example.

Thus, the axial width L31 and L32 two continuous in the axial direction of the layers 31 and 32, respectively 0,72 So 0.41 So, and the width of the two pairs of polusaev respectively 0,29 So and 0.125 So. Width defined above areas are also respectively 0,145 So, 0,06 So, 0,095 So, 0,06 So, 0,065 So and 0.01 So.

Whenever the structure of the working valves of the crest of the armature 3 is supplemented from the outside in predpochtitelno at least two layers of so-called elastic metal reinforcing elements, or winding wavy or zigzag metal reinforcing elements made of steel and located at least one layer.

Pneumatic tyre R supplemented treadmill tread 4 and side walls 5, while the valve frame 1 is separated from the edges of the reinforcement of the ridge 3 of the profiled elements 6 made of a rubber mixture and having essentially triangular shape, with the ends of the working reinforcement layers of the ridge 3 is also divided among themselves or profiled elements are triangular in shape, made of rubber or the flat edge of the rubber layers.

Pneumatic tires of the type indicated above, is shown in Fig.1 and 2, were compared with a control pneumatic tire of the same size, but containing normal working valves of the ridge, i.e. the valve of the ridge formed two working layers, continuous in the axial direction and having a width in the axial direction, close to the axial distance separating the outer axial ends of the layers 33 and 34 of the two subjected to testing pneumatic tires.

Conducted sea trials to determine the longevity of a pneumatic tire in which, equipped with the same pneumatic tires on the front and on the rear axle, and on the roadway construction site that contains many twists and turns) that is proposed and described above technical solutions significantly increase the resistance of pneumatic tyres to mechanical damage as a result of separation from each other reinforcement layers of the ridge.

When this control pneumatic tyre in the middle stood the movement for 250 hours (to and fro), whereas subjects pneumatic tyres stood in the middle of the movement for 720 hours, and the advantage possessed a pneumatic tyre, the construction of which corresponded to Fig.1 if visually examine the resulting damage. The mentioned improvement was obtained without deterioration of characteristics related to rupture of reinforcement ridge due to exposure to aggressive external objects and without affecting the behavior of the vehicle on the road.

Claims

1. Pneumatic tire with shape factor less than 0,80 containing radial valve frame formed of at least one layer (1) metal inextensible Podkrepa least two working layers (31, 32) ridge, continuous in the axial direction and formed of inextensible metal reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction anglesand", the value of which is in the range from 10° to 45°, wherein the two working layers (31) and (32) have an axial width L31 and L32, the value of which is in the range of 0,65-0,80 So and 0,35-0,45 So, respectively, and So represents the maximum axial width of the middle line of the valve frame (1), and the working valve crest (3) supplemented by at least two palosaari (33) formed of metal inextensible reinforcing elements forming with the circumferential direction an anglewhose value is less than the smallest of the anglesand'at least 2°, and having the opposite direction to the anglethe orientation of the reinforcing elements of the most extensive and continuous in the axial direction of the layer (31), and polsloe (33) are located on either side of the Equatorial plane XX’ and have axial the Board ends defended from the Equatorial plane XX’ at a distance, equal to half the width of the least wide working layer (32), reduced by an amount at least equal to 0.05 So.

2. Pneumatic tyre under item 1, characterized in that both are continuous in the axial direction of the layer (31) and (32), formed of reinforcing elements oriented at anglesand’ are radially closest to the valve frame (1), and the least extensive layer (32) is closest to the outside in the radial direction reinforcement layer frame (1) and this is the least extensive layer (32) contains reinforcing elements oriented at an angle’.

3. Pneumatic tyre under item 1 or 2, characterized in that the working valve (3) is supplemented from the outside in the radial direction from the first two polusaev (33) two palosaari (34), formed of inextensible metal reinforcing elements parallel to each other in each polsloe (34), overlapping with the reinforcing elements of two lower in the radial direction of polusaev (33), forming with the circumferential direction an angleexceeding the largest of the anglesand’ subject to the ear of the first polusaev (33) of at least 10°.

4. Pneumatic tyre on p. 3, characterized in that the inner axial ends of two polusaev (34) of the reinforcing elements oriented at an angleare separated from the Equatorial plane XX’ by a distance equal to half the width L31 most extensive and continuous in the axial direction of the working layer (31), reduced by the amount of at least 0.05 is So.

5. Pneumatic tyre on p. 4, characterized in that the outer axial ends of polusaev (34) of the reinforcing elements oriented at an angleare separated from the Equatorial plane by a distance not greater than the distance separating of said outer plane in the axial direction ends of polusaev (33) of the reinforcing elements oriented at an angle.

 

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