Pneumatic tyre with triangulated reinforcement ridge

 

The invention relates to the automotive industry and is designed primarily for vehicles of high capacity. Pneumatic tire with an aspect ratio H/S in the range from 0.3 to 0.8 contains the valve frame and located over the top of the valve frame in the radial direction quasicylindrical armature crest. Between the contact point of the wheel rim and the point of greatest axial width of the reinforcement frame provided with a reinforcement reinforcement, formed of the elements, inextensible in the circumferential direction. Inflated on the rim of the valve frame in the longitudinal section has a profile consisting of four arcs of a circle. As a result of increased resistance of the tires and reduces the rolling resistance of the wheel. 8 C.p. f-crystals, 3 ill.

The invention relates to a pneumatic tire with a radial reinforcement frame. More specifically the invention relates to pneumatic tires for heavy vehicles heavy vehicles, moving at a high speed, such as trucks, tractors, trailers or buses.

Pneumatic tire for heavy vehicles type Poids-Lourds contains generally radial to the valve frame, obrazovanii least one side of the ring. On top of this valve frame in the radial direction is located the valve of the ridge formed by at least two working layers, 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 of the pneumatic tire angles, the value of which is in the range from 10 to 45o.

Mentioned layers of reinforcement ridge is usually supplemented by a so-called protective layer formed of a metal and tensile reinforcing elements, or so-called triangulation layer, formed of inextensible metal reinforcing elements oriented in relation to the district direction at an angle exceeding 45oor a layer of reinforcing elements oriented in the circumferential direction, or layers of both types.

Pneumatic tyres type Poids-Lourds characterized by the aspect ratio H/S, typically having a size in the range from 0.65 to 1.0, where H represents the height of pneumatic tyres on its operating rim and S represents the maximum axial width of the pneumatic tire in the case when the optical bus type Poids-Lourds, with smaller values of the aspect ratio H/S, for example 0,45.

For any type of pneumatic tires it is known that a compromise between different properties that are desirable in this case, it is usually difficult to implement, because improving one of its characteristics is often, unfortunately, accompanied by a deterioration of one or more other characteristics.

There have been many attempts to provide the best compromise of this kind, particularly in regard to pneumatic tires for passenger cars.

To improve driving comfort, improved stability of the tire to puncture and abrasion resistance of the tread in the publication GB 359110 suggested the pneumatic tire in the process of forming and vulcanizing a matrix form, very close to the form that this pneumatic tyre will be under load, whereas treadmill tread is inextensible in the circumferential direction by use of the valve, formed from continuous in the circumferential direction cord yarns or wires. Thus, this pneumatic tire is formed with a reduced form factor, strongly curved boom ring, to the common tangent to the onboard ring and to the meridional profile of the valve frame formed at the point of contact between the profile and the side ring and with respect to the straight line parallel to the axis of rotation of the pneumatic tire, the angle, which is open axially outward and radially inward.

Some improvements compromise between comfort when driving the vehicle, the behavior of pneumatic tires on the road and its stability in U.S. patent US 3486547 describes a pneumatic tyre with a small amount of aspect ratio H/S, for example, in the range from 0.25 to 0.75, in which the area of side, close to the edges of the mounting rim, essentially parallel to the axis of rotation of the pneumatic tire, and these areas are reinforced by inextensible in the radial direction of the rings, and these rings may have a different design.

This structure pneumatic tyres requires mounting on a rim having a width W, is small relative to the maximum axial width S of this pneumatic tire, the ratio W/S can be in the range from 0.25 to 0.75.

Such a pneumatic tire described in French patent FR 1267264 and allows you to combine comfort with motion To significantly improve the design flexibility of the valve frame and eliminating the defects, that automatically accompany this increased flexibility, the valve frame has a strongly curved sides and over the top of the valve cage is cylindrical armature ridge, inextensible in the circumferential direction and preferably formed of longitudinal reinforcing elements.

The reinforcement frame is in the neighborhood of the bead rings of the fixing part with a horizontal tangent, or part, located at radii smaller than the radii of the circular tabs of the mounting rim, and mentioned part, in the described case, reinforced by reinforcing elements.

U.S. patent US 4029139 also relates to a pneumatic tire with the value of the shape factor H/S, preferably in the range from 0.40 to 0.60, and the ratio W/S of the width of the mounting rim W to the maximum axial width S of the pneumatic tire is less than 0,65. This document describes a specific system to engage the sides of the tire for mounting the rim so that part of the sides adjacent to the rim, were essentially horizontal.

The development of pneumatic tires of the type Poids-Lourds with application to a pneumatic tire mentioned above technical solutions o effectively increased, this cannot be said about the overall durability of this pneumatic tire, in particular, regarding the resistance to wear or fatigue strength of the various components of this valve pneumatic tyres.

The task of the invention is to increase the total resistance of pneumatic tyres of this type, while reducing its resistance to rolling.

Pneumatic tire according to the invention, characterized by the aspect ratio H/S, has a value in the range from 0.3 to 0.8, contains the valve frame formed of radial reinforcing elements and having an Equatorial radius RssRssand hereRssrepresents 1 minimum thickness of the said valve.

On top of this valve frame in the radial direction is quasicylindrical or essentially cylindrical armature ridge formed in at least one working layer formed of circumferential reinforcing elements.

Said valve frame on either side of the Equatorial plane is tangential in relation to the so-called circle of engagement With, and oprofile and a circumference of the engagement and in relation to direct, parallel to the axis of rotation and passing through the point of tangency, the angle having a value in the range from +20 to -80oand on the other hand, in its part between the touch point and the point of greatest axial width provided with a reinforcement reinforcement, formed of the elements, inextensible in the circumferential direction.

This pneumatic tire in accordance with the invention is characterized by the fact that in the meridional cross-section of the middle line of each half of the main part of the valve frame has, in the case when this pneumatic tire is installed on the operating rim and inflated to recommended pressure, meridional profile, consisting of four arcs of a circle: the first arc of THE circle having the radius r1whose magnitude is in the range between values, or equal to one, r1and/or 2r1and, with one hand, which is tangent to the circumference of the gear, concentric with respect to the circumference of the circular protrusion of the rim with radius rJlocated on top of it in the radial direction and spaced from the circular lip of the rim at a distance of etat least twice the minimum thickness e Armatur AE, with radius r1whose magnitude is in the range of r1to 2r1and on a straight line, perpendicular to the axis of rotation of the pneumatic tire and passing through the point e of the maximum axial width; the third arc of a circle EF radius r2concerning the second circular arc AE at point E. the greatest axial width and on the fourth circular arc FG parallel to quasicylindrical the valve of the ridge, at the point F, separated from the straight line parallel to the axis of rotation and passing through the center OJthe circumference of the engagement With, the distance d, and the value of d, r1and r2satisfy the following relations: d=r2+(r1+arJ+ft)cosand r1=r2Rss(Rss- r2), where- angle, which forms a tangent at the point T with a straight line, parallel to the axis of rotation; and a is a constant, which can take the values -1, 0 or +1; the fourth arc of a circle FG with radius RCUequal to the transverse radius RTreinforcement ridge, reduced by no more than the minimum thickness e of the valve frame, the width of the working armature ridge has a value between the value of ry, increased by 2r2/3.

Under quasicylindrical valves crest in this case, you should understand a reinforcement ridge, transverse radius of curvature which is at least 4 times the Equatorial radius of its curvature.

Mentioned radial elements of reinforcement reinforcement frame may be made of textile materials due to the low tension felt by the supporting element, and this experience tension due to internal pressure pumping and is a function of the meridional profile of the reinforcement frame.

The preferred way valves crest of this pneumatic tire is formed continuous in the axial direction of the layer formed of inextensible circumferential reinforcing elements, for example of metal cord threads (inextensible in this case referred to as such reinforcing elements, which are under the influence of tensile forces, constituting 10% of the efforts of their break, elongation of less than 0.5%), and two layers of inextensible reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction an angle, amount 55o.

Under axial width of the working valves of the crest in this case, you should understand the higher of the two values of width, which represents the axial width of the reinforcement layer of the ridge, formed of circumferential reinforcing elements, and the axial width of the least wide reinforcement layer of the ridge, formed from the inclined reinforcing elements.

Reinforcement of the frame on each side of the Equatorial plane and in the part, which is arranged in the radial direction between the point of tangency with the circle of engagement and the point of greatest axial width, supplemented with rebar reinforcement, essentially inextensible in the circumferential direction. This valve may be formed by a simple cable of a known type (for example, wicker, "packet", a rope made of rectangular wires, etc.,) or at least one layer of inextensible circumferential elements, preferably metal.

Reinforcement reinforcement can be located either inside the reinforcement frame, or outside from the valve frame, or between the reinforcement layers of the frame, or in all three positions. Rebar reinforcement in the preferred embodiment, the implement is positioned in the axial direction around a point peresecheniye two touch points in the meridional profile of the valve frame with two circles of engagement, has a value smaller than two-thirds of the maximum axial width of the reinforcement frame.

The gearing for operating the rim on which is mounted a pneumatic tire that can be implemented in a known manner, by means of its sides, each of which contains at least one bead ring, around which by turnover fixed armature frame. The turnover of the reinforcement frame is of such length that is considered as an integral part of the reinforcement reinforcement located in the lower sidewall of the pneumatic tire.

Bead ring fastening reinforcement frame, in accordance with the meridional profile of this fixture frame may have a cross section less than the cross-section of side rings normally used in the pneumatic tire of the traditional form and having the same axial and radial dimensions. Preferably, in all cases, when there is turnover of the valve frame, it was located in the area of small deformation. It can be pinned to the main part of the valve frame without any profiled elements between the main part and the above-mentioned circulation.

Lock the valve frame in the sides pneumatic tyres mo the x and inextensible reinforcement elements, or between the rim and rebar reinforcement, as stated above.

Other characteristics and advantages of the invention will be better understood from the following description with reference to the corresponding drawings, in which: Fig. 1 shows a meridional section of a pneumatic tire in accordance with the invention;
in Fig.2 is a meridional cross-section of motorway in the meridional profile of the centerline of the fixture frame according to the invention;
in Fig.3 is an embodiment of the meridional profile and method of mesh reinforcement frame for operating the rim according to the invention.

Pneumatic tyre R, schematically shown in Fig.1, has a shape factor H/S, amounting to 0.55, and is mounted on the operating rim J of size 922,5.

In the described embodiment, the valve frame 1 (Fig.1) formed from one layer of reinforcing elements, which are cord thread made from aromatic polyamide. The said layer of reinforcement of the frame 1 are fixed in each Board on-Board ring 2 wicker type, forming therein a turnover of 10, the meridional profile of which is wrapped around the arc of kromature frame 1 by means of small profiled element 7 is triangular in shape.

Between the point e of the maximum axial width of the reinforcement layer of the framework and the Board 3 is located rebar reinforcement 6, formed by a layer 61 inextensible metal cord threads posted in the radial direction from the inside of the meridional profile of the reinforcement layer frame 1, layer 62 inextensible metal cord threads posted in the radial direction from the outside of the layer of reinforcement of the frame 1, and the reinforcement ring 60 located between the layer of reinforcement of the frame 1 and the above-mentioned layer 62 and formed by winding a metal wire, which give the said ring is almost full compliance.

The layer of reinforcement frame 1 tangentially adjoins the valve of the ridge 3, which is formed, on the inside in the radial direction, the metal layer 30 inextensible cord and district threads (under district of cord threads in this case should be understood cord thread forming with the circumferential direction of the pneumatic tire angle, the value of which can be in the range from +2.5 to -2,5o), and two layers 31 and 32, formed of inextensible metal cord threads, parallel to each other in each layer and crossed from one layer to the next, forming with the County EOC is BNA pneumatic tyres. This implies that the working valve can be supplemented with a protective reinforcement formed by layers formed of elastic reinforcing elements.

This pneumatic tyre R supplemented outside the treadmill tread 4, which by means of two sidewalls 5 is connected to the two sides, based on operational rim J with protective rubber mixture 8, and from the inside with a layer 9 of a rubber mixture that is impermeable to gases inflation, which can be used for this pneumatic tyres.

Fittings ridge 3 has an almost cylindrical shape, and the transverse radius RTinterior in the radial direction of the surface layer of the ridge 30 that is closest in the radial direction to a layer of reinforcement of the frame 1, 5 times greater than its Equatorial radius.

If we call the middle line of the main part of the reinforcement layer frame 1 line (shown in Fig.2 by the dotted line), divided into two equal parts the thickness e povernutoy part of this layer, the meridional profile of this middle line, the Equatorial radius of which is Rssequal to the Equatorial radius of the valve crest, reduced by an amount equal to half the thickness e/2 reinforcement layer SC is centered in the Equatorial plane XX', the radius of curvature of which is denoted by RCUand equal to RT- e/2, as an arc of a circle parallel GF reinforcement layer of the ridge 30, which is located in the radial direction closest to the layer of reinforcement of the frame 1.

An arc of a circle GF axially outward and radially inward tangentially continued at the point F of the third arc of a circle EF with the center of curvature O2and the curvature radius r2and this arc of circle EF, which applies at the point E, that is, at the point of greatest axial width S0the meridional profile referred to the middle line of D perpendicular dropped from the point E to the axis of rotation of the pneumatic tire.

Maximum axial width S0the meridional profile of the average line is of greatest axial width S of the pneumatic tire, and the difference S-S0equal to the thickness of the layers of rubber mixes located outside layer of the reinforcement frame 1, and the value of S is usually a value specified dimensions provided by the designer of the car, which should be installed this pneumatic tyre.

An arc of a circle EF from the inside in the radial direction continued the second arc of a circle Easti EF. An arc of a circle ED refers to in point E of D perpendicular to the axis of rotation of the pneumatic tire, and is also intersecting at point a for the first arc of a circle AT the center of curvature O'1and the radius of curvature r'1which in the described example implementation exceeds the radii r2and r1.

The first arc of a circle AT applies at the point T of the circle of engagement With the center of curvature OJand with the curvature radius rJ+fTand the center OJis the center of the circular arc constituting the outer radial wall of the rounded hook engagement of the rim J, having a radius of curvature rJcompletely determined by the characteristics of the mounting rim, and the value of eTdetermined by the developer pneumatic tires and at least twice the minimum thickness of the reinforcement frame.

The common tangent at the point T to the meridional profile of the middle line of the valve frame 1 and to the circumference of the engagement With forms with a straight line, parallel to the axis of rotation of the pneumatic tire and passing through point T, the so-called negative angleopened outward in the axial direction and inward in the radial direction and is equal to the 13o.

Escasa from the center OJthe outer wall of the hook of the rim and which is defined, it is easy geometrically deduced from these data that the value of d in this case is equal to that constant and has the value +1, the sum of the values of radius r2and works of the cosine of the anglethe sum of the values of r1+rJ+fT:
d=r2+(r1+rJ+fT)cos.

Since it is known that the radius r1can have a value equal to Rssr2(Rss-r2), you can obtain a value of r2in the function of a known or predetermined parameters, such as d, rJeTand cosmoreover , the value of r2is the value, which is usually called the average radius of the circular arc EF.

Presents a case where the constant a=+1 corresponds to such a circular protrusion of the mounting rim, the center of curvature OJlocated in the radial direction from the inside of the circular protrusion. Thus the value of the distance d can be expressed by the ratio
d=r2+(r1-rJ+fT)cos,
in that case, when the center OJthe circle represents the circular protrusion of the mounting rim, close to the e, when the circular protrusion of the rim can be considered as flat, the distance d is determined by the ratio
d=r2+(r1+fT)cos,
in this case, the constant a is equal to zero.

Since the curvature radius r2known, the radius r1known as the radii r'1and r1. It is also possible to determine the centers O'1and O1arcs of a circle AT EA and, to trace these arcs and determine the touch point T at that locus of the center OJrepresents a line parallel to the axis of rotation and spaced from said axis at a known distance ROJ.

In Fig.3 schematically presents an embodiment of the pneumatic tire in accordance with the invention. This pneumatic tire is different from the pneumatic tire shown in Fig.1, the following characteristics:
a) meridional profile of the reinforcement layer frame (1) on at point T the circumference of the engagement, with the circumference of a common tangent, forming a straight line, parallel to the axis of rotation at the point T, the anglezero;
b) in this case, the mesh reinforcement frame is emom here the case is metal cord thread, made of steel, which are arranged in the form of layers on the outside in the radial direction and from the inside in the axial direction (82, 82'), as well as from the inside in the radial direction and on the outside in the axial direction (81, 81');
C) reinforcement reinforcement (6) layers of the frame (1), located between the point e of the maximum axial width and the touch point T, it also consists of several layers of metal reinforcing elements, in this case, the steel cord filaments, which are located inside (62, 62') and outside (61, 61').


Claims

1. Pneumatic tire with an aspect ratio H/S in the range from 0.3 to 0.8, containing the valve frame (1) formed of radial reinforcing elements and having an Equatorial radius RssRsswhereRssrepresents the minimum thickness e of the valve frame, and on top of the valve frame in the radial direction is quasicylindrical fittings ridge (3) formed with at least one working layer (30) formed of circumferential reinforcing elements and the reinforcement frame (1) on either side of the Equatorial plascoat frame (1) forms in the touch point T between the profile and the circumference of the gear With respect to a straight line, parallel to the axis of rotation and passing through the point of tangency T, anglehaving a value in the range from +20 to -80and in part between the touch point T and the point e of the maximum axial width of the supplied reinforcement reinforcement (6), formed of the elements, inextensible in the circumferential direction, characterized in that in the meridional cross-section of the middle line of each half of the main part of the valve frame (1) has in the case where the pneumatic tire is installed on the operating rim and inflated to recommended pressure, meridional profile, consisting of four arcs of a circle: the first arc of THE circle having the radius r'1whose magnitude is in the range between the values of r1and 2r1or equal to one of these values applies to the circumference of the gear, concentric with respect to the circumference of the circular protrusion of the rim with radius rJlocated on top of it in the radial direction and spaced from the circular lip of the rim at a distance of eTat least twice the minimum thickness e of the valve frame, and has a point of intersection And the second of a circular arc, the second arc of a circle AE radius r12concerning the second circular arc AE at point E. the greatest axial width and which is tangential with respect to the fourth arc of a circle FG parallel to quasicylindrical fixture ridge (3), at point F, separated from the straight line parallel to the axis of rotation and passing through the center ojthe circumference of the engagement With, the distance d, and the value of d, r1and r2satisfy the following relations:

d=r2+(r1+arJ+fT)cosand r1=r2Rss(Rss-r2), whereis an angle that forms a tangent at the point T with a straight line, parallel to the axis of rotation, and is a constant that can take the values -1, 0 or +1,0, fourth arc of a circle FG radius RTCequal to the transverse radius Rtreinforcement ridge, reduced by no more than the minimum thickness e of the valve frame, the width of the working armature ridge (3) has a value in the range between the value of the distance separating the two points F touch the meridional profile of the valve crest (3), and the above-mentioned distance, increased by 2r2/3.

2. the AI layer (30), formed from district inextensible reinforcing elements, and two layers (31) and (32), formed of inextensible reinforcing elements parallel to each other in each layer and crossed from one layer to the next, forming with the circumferential direction an angle whose magnitude is in the range from 40 to 55.

3. Pneumatic tire according to any one of paragraphs.1 and 2, characterized in that the reinforcement reinforcement (6), which increases the valve frame (1), on each side of the Equatorial plane XX', and in his part enclosed in the radial direction between the point of tangency T with a circle gearing and point E lying on the line of greatest axial width Saboutthe meridional profile of the centerline of the valve frame is essentially inextensible in the circumferential direction and formed simple side ring known type.

4. Pneumatic tyre on p. 3, characterized in that the reinforcement reinforcement (6) is supplemented with at least one layer, preferably formed of metal district inextensible elements.

5. Pneumatic tire according to any one of paragraphs.1-4, characterized in that the axial distance between the two touch points T meridionalnyi of the maximum axial width Saboutthe valve frame (1).

6. Pneumatic tire according to any one of paragraphs.1-5, characterized in that the reinforcement frame (1) is fixed in each Board on at least one side of the ring (2) so as to form therein a turnover (10).

7. Pneumatic tyre on p. 6, characterized in that the turnover is of such length that is an integral part of reinforcement reinforcement (6).

8. Pneumatic tire according to any one of paragraphs.1-5, characterized in that the lock reinforcement frame (1) in the sides is carried out by inserting the edges of the reinforcement frame between the two valves, formed of inextensible and circumferential reinforcing elements or between the rim and valve reinforcement of the type described above.

9. Pneumatic tire according to any one of paragraphs.1-5, characterized in that the reinforcement frame (1) forms a closed torus.

 

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EFFECT: improved reliability and strength of tires.

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