Pneumatic tire crown reinforcement

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

 

The invention relates to a pneumatic tire with a radial frame reinforcement, intended for use in construction equipment in residential and/or civil construction, such as loaders, trucks, graders, scrapers.

The specified pneumatic tire contains at least mainly of frame amplification of radial steel cord and between this frame reinforcement and a treadmill tread reinforcement in the crown, consisting mainly of the so-called working reinforcement comprising at least two layers of inextensible metal cords parallel to each other in each layer and crossed threads of one layer with another, forming with the circumferential direction angles, which may be in the range 0° to 45°. The use of technology, equipped with pneumatic tires, also requires located radially outside relative to the working layers of the so-called protective amplification, comprising at least one layer of elastic steel cord. Elastic cord is called a cord, which is in tension with a force equal to razryvnaya force, has an elongation of not less than 3%, and the so-called inextensible cord under the action of tension force equal to 10% of its disruptive force, has come otnositelnoi elongation of not more than 0.2%. KORD one or more protective layers formed with a circumferential direction angles, which can be between 5° to 35°and if there are two layers of cords of one layer usually overlap with the other.

If initially, as indicated by their name, these protective layers had as their main purpose to protect the working gain on the impact on the pneumatic tire from the ground, their structural features in the modern pneumatic tires lead to the fact that, first, they largely contribute to the strength between the two working layers and, secondly, given the increase in service life of pneumatic tires used in civil construction, they are not sufficient to ensure permanent protection for the entire lifetime.

Pneumatic tire of the type in question is exposed from the soil on which it moves, numerous influences, in particular in regard to loading and transport vehicles. Such impacts cutting, clipping and other articles of lead:

a) to cuts in the tread, which accelerate the degradation of the specified tread, cuts in protective layers that contribute to a lesser extent or not at all contribute to the adhesion strength between the working layers, as well as to Esam working layers, that can lead to the spread of moisture and soil particles and oxidation of metal elements of these layers

b) to the through punctures in the crown, including the frame itself enhancement may be punctured depending on the nature and form of the acting subject. The cut resistance of protective layers and the strength of the crown to puncture should be improved.

From patent US 3589425 known design, comprising between one and the other ends of the tread aircraft pneumatic tires equipped with the carcass reinforcement consisting of several layers of textile elements, crossed from one layer to another, first, layers angled textile yarn passing at the base of the circumferential grooves of the tread to prevent the effects of centrifugal force on the specified protector, and, secondly, two layers of super-elastic metal cord with a relative elongation in the range from 15% to 40%, and this cord intersects the threads of one layer to another, and these layers are sealed between the base of the grooves of the tread frame and frame reinforcement specified pneumatic tyres.

In order to avoid and minimize the spread of strengthening the tread cracks at the base of the transverse grooves in the pneumatic tire used in civil construction, in the patent FR 2388685 of the criminal code is called on the need to have in bezkaravajnoj of the tread between the base of the grooves and the strengthening of the crown, at least one layer slaborastvorimogo cord (metal cord with a relative elongation of less than 0.5% at a tension force equal to 10% of breaking load), to arrange the cord angle relative to the circumferential direction of less than 30°preferably within 12-24°and to ensure that the radial distance between the base of the grooves and the specified cord layer was smaller and amounted to about one third relative to the radial distance between the base of the grooves and the strengthening of the crown, which is radially closest to the tread. This structure does not protect from cuts and their distribution and greatly reduces the impact strength of the crown pneumatic tires with quick impact from massive obstacles.

With the aim of improving the strength of the crown pneumatic tyres, used and civil construction, three types of impacts from external objects, namely tensile cuts, strength puncture and impact resistance, pneumatic tire according to the invention, comprising a radial frame reinforcement anchored in each side-Board with the annular reinforcing element side, and radially above the strengthening of the crown, including at least two working layer of inextensible metal cords, which images the n crossed one layer to another, the width of these layers is at least 50% of the width L of the tread and radially above two protective layers on the crown of the so-called elastic steel cord formed by the crossing of one layer with another protector, including its bezkaravajnoj part of the thickness D of at least one strengthening of the reinforcing elements, characterized in that the reinforcement comprises at least two layers of textile monofilaments, parallel to each other in each layer, and the axial width of the two layers, at least equal to the width of the narrowest working layer.

Particularly advantageous is that the rigidity of the package layers between the frame reinforcement and soil changes only slightly due to the fact that the layers are formed of monofilaments forming the junctions between the layers, and to form a circumferential direction angles in the range from 50° to 60°.

The textile material preferably presents polyamide fiber, which can be both aliphatic and aromatic. Per unit axial width and unit circumferential length bezkaravajnoj tread volume occupied by elements of the reinforcement layers, does not exceed 20% of the total volume, and thus the volume of the rubber compound is not less than 80% of the specified total volume: Azania above indicators allow filling to get a very good combination of strength on cuts and impact strength for additional reinforcement of the tread.

The characteristics of the present invention will be better understood using the description of the mode of implementation described in the form of a non-limiting example shown in the accompanying drawing in which the sole figure 1 schematically depicts a pneumatic tire for vehicles used in civil construction according to the invention, in the form of cross-section.

This pneumatic tire size 18.00-33 XDT consists of frame amplification, comprising a single layer of 1 inextensible radial metal, steel cord fixed in each Board, usually by wrapping around the side rings 2, for the formation of coils 10 frame amplification, the ends of which are located at approximately half the height of the sidewalls 5. This frame is reinforced on the inside in the axial direction of the package 6 two ply of aliphatic polyamide fibers, filaments which in one layer overlap with another, and these layers in the axial direction are arranged in the thickness of the solid rubber compound 7 and radially located approximately in the middle of the sidewall 5. Between this frame reinforcement 1 and the protector 4 is increased by the crown 3, containing radially from the inside out:

two so-called "fretting" layer 31, which is formed of inextensible metal cord comprising OK with uznam direction angle 8° and the axial width of which is equal to 28% and 22% of the axial width L of the tread,

the so - called gain 32, consisting of at least two layers 320 and 321 inextensible metal cords parallel to each other in each layer, formed by crossing layer 320 with a layer 321 and forming with the circumferential direction angles equal respectively 34° and 20°and the axial width of the two layers 320 and 321, respectively, 75% and 55% of the width L of the tread 4,

- radially outside the working reinforcement 32 is a protective reinforcement 33, consisting in the described case of the two protective layers 330 and 331, and these two layers, forming the so-called elastic cord, formed by the crossing of one layer 330 with another layer 331 and forming with the circumferential direction an angle equal to 28°, the axial width of said two protective layers 330 and 331 such that the axial width (89% of the width (L) of the widest layer 330 exceeds the axial width of the widest working layer 320, and the axial width of the narrow (68% of the width L) layer 331 exceeds the axial width of the narrowest working layer 321,

in bezkaravajnoj of the tread 4 of thickness D, measured in the Equatorial plane, but definitely changing depending on the axial point of measurement, there are additional reinforcement 34 of the tread, and the specified gain consists of two with the OEB 340 and 341 of the aliphatic polyamide monofilaments, parallel to each other in each layer and crossed from one layer to another and forming with the circumferential direction angles equal to 55°and the axial width (63% and 58% of the width L) of the above two layers 340 and 341 exceeds the width of the narrowest working layer 321. Mentioned two layers 340 and 341 are separated radially layer of rubber compound, which forms Basanaviciaus of the protector of the three sub-layers: layer 35 between the radially lower layer 340 reinforcement 34 and the extreme outside protective layer 331, the layer 36, which separates the two layers 340 and 341, and the layer 37 between the base of the grooves and the radially upper layer 341 gain 34, the thickness of D0these sublayers 35, 36, 37, measured in the Equatorial plane and approximately constant over the entire axial width equal to D/3.

The characteristics in virtue of which the specified monofilament made of polyamide and radially separates the protective layers 330 and 331, minimize the spread of cuts on the protective reinforcement that allows him to perform a dual function of protection and combating the isolation of the working layers, and improve puncture resistance. The characteristics in virtue of which the specified monofilament oriented at an angle equal to or approximately equal to 55°and strengthening corresponds to a given structure filling (volume occupied by reinforcement elements equal to 15% of the total volume in the described example), n is help avoid excessive rigidity in bending by the crown as a whole and do not reduce the impact strength, but, on the contrary, improve it.

The results are especially convincing in regard to strength on cuts, with the same number of hours running on the rocky soil with repeated crossing puddles of salt water was noted quite a lot of cuts found in the radially at the outside layer 341, however, the protective layers 331 and 330 remained unaffected, while these protective layers control pneumatic tyres (without reinforced drain of the protector) had numerous cuts and observed the penetration of moisture and the beginning of the oxidation elastic cord protective layers.

1. Pneumatic tyre for machines used in civil construction, containing radial frame reinforcement (1), fixed in each Board through the annular reinforcing element (2) side, and radially above the strengthening of the crown (3)containing at least two working layers (320, 321) inextensible metal cords formed by crossing one layer (320) with another (321), and the width of these layers is at least 50% of the width L of the tread (4)and radially above two protective layers on the crown (330, 331) so-called elastic steel cord formed by crossing one layer (330) with another (331), protector (4), including its bezkaravajnoj part t is linoy D at least one amplification (34) of the reinforcing elements, characterized in that the reinforcement (34) consists of at least two layers (340, 341) textile monofilaments, parallel to each other in each layer, and the axial width of the two layers (340, 341) at least equal to the width of the narrowest working layer (321).

2. Pneumatic tire according to claim 1, characterized in that the textile monofilament intersects one layer (340) other (341) and forms with the circumferential direction angles of between 50° to 60°.

3. Pneumatic tire according to claim 1, characterized in that the textile material is represented by the polyamide.

4. Pneumatic tire according to claim 1, characterized in that the volume occupied by the elements of the reinforcement layers (340, 341), per unit axial width and unit circumferential length bezkaravajnoj of the tread (4) does not exceed 20% of the total volume, and the volume of the rubber mixture is thus at least 80% of the specified total amount.



 

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