Tubeless tyre having a slitted inner-liner, and process for its manufacture

17-07-2013 дата публикации
Номер:
CN102119088B
Контакты:
Номер заявки: 13-80-20091080
Дата заявки:

[1]

Technical Field

[2]

The invention relates to a tubeless tire, more particularly to a liner, the liner for these tire is inflated by a gas impermeable. The invention also relates to a process for manufacturing these tires.

[3]

Background Art

[4]

Designed to pass the inflation gas for inflating a tubeless tire most "lining", that is to say, covers the inner surface of the tire inflation gas impermeable rubber formulation (rubber   compound). The most common situation is, the lining is composed of butyl-based rubber formulation form.

[5]

These inner liner impermeable inflation gas in the tire may be the fact that the various problems in manufacturing. Has been observed, in particular, in the process of manufacturing the tire to the air trapped under may be accumulated in the lining, particularly in the renovation of and radially inward of the side wall is accumulated half, to form a gas bubble therein. These bubbles damage the appearance of the tire, but the existence of the air bubbles also may have the consequences of tire life. Specifically, bubble may be caused by loss of adhesion of the inner liner. In some serious cases, the lining may be from the bead and from the internal part of the side wall, this leads to a certain degree of sealing loss, and leads to a large number of air penetration into the material of forming a tire, this may shorten the service life of the tire. Adhesion loss replacement of the customers will also be a factor of the tire. That is, the cured tire manufacturer after checking the tire in order to measure the reason for the existence of air bubbles. If bubbles of the number and/or size is too big, then the tire would be destroyed.

[6]

A number of solutions have been proposed to overcome this problem. For example, document JP   60196331 lining, by means of a laser beam to burn in the hole. These holes can make the air in the tire manufacturing process of the 1st stage of the vulcanization and escape of. In the vulcanization process these hole is lined flow sealing, thus can be realized after the integrity of the cured lining.

[7]

Document JP   2005238654 describes another method, the lining of the apertures therein and the appropriate mould.

[8]

Bubble formation of the problem to another solution lies in reducing the covering of the surface area of the inner lining. In particular, can make the bead and the most inner part of the radial direction of the side wall is not covering the inner liner. The tire has been for the purpose of reducing the weight of this type of tire, but they also has the bubble formed by the advantage of less influence. For example, according to the document JP 4090902 and EP   1   228   900, such a tire is known.

[9]

However, there are also shortcomings thus the tires. Special attention has been given to, the surface area of the lining covers the reduction of the noise generated due to increase of the tire, in particular in the cavity resonant mode frequency range (  frequency cavity   mode). Therefore, using such a tire between the tire the installed vehicle body vibration, and reduce the comfort of the hearing of the user. Furthermore, the surface area of the lining covering the decrease of the air pressure at any time in the passage between the greater the loss.

[10]

Content of the invention

[11]

A purpose of this invention is to provide a tubeless tire, not easy to manufacturing the same of the tire is formed between the inner liner and the adjacent part of the bubble, so that the tire has a longer service life, at the same time can make the inflation pressure loss is minimized.

[12]

Through a this purpose is that of a tubeless tire, the tire is designed as an inflated inflation gas, the tire, comprising:

[13]

-Crown, said tire crown comprising a crown reinforcing member, states the embryo crown reinforcing member is covered from the top by a tread;

[14]

-Two side walls, the side wall so that the tire crown extending radially inwardly;

[15]

-Two bead, the bead the radially inner side of the sidewall, each bead includes at least one annular reinforcing structure;

[16]

-Tire body reinforcement, the fetus body reinforcement in anchored in each bead;

[17]

-Inner liner, the liner can not be penetration of inflation gas, and covering the inner surface of the tyre.

[18]

According to the embodiment of the invention each side wall of the tire, the inner liner includes at least one gap, the gap in the radial direction is located between two of the following:

[19]

-radial, the outermost circular reinforced structure, and

[20]

-When the tire is mounted to the rim and to its working pressure, the fetus body reinforcement has at the most the same to the width of the radius of the ring.

[21]

With the gaps is between 0.5 and 5 mm of the maximum radial height of between, preferably between 1.5 and 2.5 mm between, and the gap in the said tire is at least half of the circumference of (180°) is extended.

[22]

Has already noted, such a tire is very significantly reduces the process of manufacturing the same in the form of air bubbles, because the tire between the inner liner and the adjacent part of the accumulation of air set up by the escaping the gap of the inner liner. By a lining and the reduced surface area covered by the comparison of the tire, the inflation pressure of loss is reduced. Furthermore, noise can be determined already, and the inner lining does not cover the bead and the radial internal part of the sidewall of a tire, the tire according to the present invention produce more noise.

[23]

According to a preferred embodiment, the gap in the tire of the at least three fourths of the circumference of the (in other words, in the 270° upper) extends. Such gaps can be discharged in air on the whole circumference. Closed air of the remaining portion of the diffusion path is short enough, so that the air can in a short time (usually in the order of magnitude of a few minutes) to discharge the. Therefore, a single slot is sufficient to discharge all of the closed air.

[24]

More preferably, in the gaps extending on the whole circumference of the tire, so that all closed air easily discharged, without using this kind of air towards the gap the proliferation of in the circumferential direction (this kind of diffusion is not immediate).

[25]

According to the special embodiment, the radial height of the gap at its end tend to zero: thus the gap is crescent-shaped.

[26]

According to a preferred embodiment, the gap is continuous. Specifically, if the gap is not interrupted, then the capacity of the discharged air reaches the maximum.

[27]

According to available embodiment, the gap is included in the liner with an array of holes in the. The need to provide on the whole circumference of the tire is an aperture extending, this embodiment may be particularly advantageous. If the gap is continuous, then in the manufacturing process, the need to address the three parts of the liner. If the gap by a row of holes a (including small gap), that is to say if the liner is perforated only, can be placed in the single, so that the processing is easier.

[28]

From another aspect the invention relates to a process of making a tire, comprising the following steps: the rubber formulation of the strip is placed in the rigid on the core body and the inner liner of the tire production, the rubber formulation used for the tire is inflated by a gas impermeable, the rigid core to the angular velocity ω about an axis rotation. The width L of the strip by means of strip placement tool is placed on the rigid heat exchanger core, in the course of the operation, the moving speed V in the placement tool in the rigid core substantially perpendicular to the direction of the rotation axis of the mobile. The angular velocity ω and the moving speed V is selected, so that the in said rigid core is a strip of the end of the part of the premises with the same said rigid core which is placed a strip of the starting point of the part of the contact, but not overlapping, or their includes the overlap also contact between the.

[29]

In particular, if it satisfies the above-mentioned situation on the following relations:

[30]

[!Integral!]0TV(t)[!CenterDot!]dtL---(1)

[31]

Wherein T is a complete rigid heat exchanger core to a time of the rotation. This relationship will form the equation there is no overlap of the contact, but not equation part having overlapping contact will be formed. Two is placed in a direction perpendicular to the direction of the part of the surface, if a part of the local stacked in another part of the localized, said known as these two parts overlap.

[32]

In a part of the inner liner is located in the following in a radial direction between the two is in the process of:

[33]

-In the tire manufacturing process is completed, the radially outer annular reinforcing structure will be in the radial position, and

[34]

-When the tire manufacturing process after the completion of mounting of the tire on the wheel rim and to its working pressure, carcass reinforcing member will have its most large axial width place radial height,

[35]

The strip placement tool and/or the moving speed of the rotation speed of the rigid core is temporarily (that is to say within a certain time) change, in order to satisfy the following inequality

[36]

[!Integral!]0TV(t)[!CenterDot!]dt>L---(2)

[37]

So that the rigid core is not a part of the covering strip.

[38]

This has produced a kind of the tire comprises a crescent-shaped continuous gap. The advantage of this kind of process, it makes a simple modification to existing craft and obtaining tire become possible, without the need for treatment with gap or a perforated inner liner ply.

[39]

Description of drawings

[40]

Figure 1 diagrammatically described tire according to the state of the art.

[41]

Figure 2 diagrammatically described according to the prior art of three-dimensional partial view of the tire.

[42]

Figure 3 diagrammatically described tire according to the state of the art radial section of a part of the.

[43]

Figure 4 and Figure 5 diagrammatically shown in the tire according to the state of the art in the manufacture of the problem of repeated.

[44]

Fig. 6 to fig. 8 diagrammatically show the existence of the air bubbles under the inner lining of loss of adhesion of the inner lining.

[45]

Figure 9 diagrammatically described a part of the tyre of the radial cross section, the inner lining and can be overcome in the tire bead region is formed between the adjacent part of the tire the problem of air bubbles.

[46]

Figure 10 diagrammatically described according to embodiments of the present invention a part of the tyre of the radial cross-section.

[47]

Figure 11 to Figure 15 diagrammatically shown the geometrical shape of the gap.

[48]

Figure 16A to fig. 21C diagrammatically shown of the according to the technology of the invention 1st embodiment.

[49]

Fig. 22 to fig. 24 diagrammatically show the process according to the invention of the 2nd embodiment.

[50]

Fig. 25 to fig. 26 diagrammatically shown in the according to the technology of the invention 1st and 2nd embodiment in moving in the radial direction of the placement tool.

[51]

Mode of execution

[52]

The technicians of this field should distinguish the word "radial" the use of several different. First of all, the statements relate to the radius of the tire. In this meaning, if point A B than point is closer to the axis of rotation of the tire, then the point A B that the "radially inner" (or in-point B the "radially inner side"). On the contrary, if point C compared to spot E more far away from the axis of rotation of the tire, then the point C E that "radially external" of (or in-point E the "radial outer side"). When there are more small along the radius (or more) when the direction of the movement of the, that is to say, there are "radially inward (or outward)" mobile. When relating to the radial distance, the terms of this meaning is also suitable.

[53]

By contrast, when the line or reinforcing element of a reinforced element and the circumferential direction is greater than or equal to 65° and less than or equal to 90° angle, the line or reinforcement is known to be of the "radial". It should be clear, in this text, the term "line" must be in order to completely understand the general meaning, including the form of a monofilament, multifilament, cable, folding yarn or equivalent assembly line, regardless of the material of the coating is formed what is wired, is coated with the coating in order to promote adhesion with the rubber.

[54]

Finally, in this case "radial section" of said tire along comprising the cross section of the plane to the axis of rotation.

[55]

"Axial" direction is parallel to the direction of the axes of rotation of the tire. If point than point F E is closer to plane of the tire, then the point of the point F E referred to as "axial internal" (or in-point F the "axially inner side"). On the contrary, if point H than point G more far away from the plane of the tire, then the point of the point H G referred to as "axially outer" (or in-point H the "axially outer"). "Plane" of the tire is the axis of rotation of the tire into a right angle and with each bead of circular reinforced structure is equal to the distance from the plane.

[56]

"Circumferential" direction is perpendicular to the radius of the tire at the same time and direction of the axial direction.

[57]

In this text, between when the two reinforcing elements forming an angle of less than or equal to 20° at the time, that is to say, two reinforcing element is of the "parallel".

[58]

In the context of the present invention, "rubber formulation" is a formulation comprising at least one elastomer and a kind of filler formulation.

[59]

"Tread" of the tire is intended to express the is composed of two main surface defined by the side surface and some of the rubber formulation, the two major surface intended to one of the tire rolling contact with the ground.

[60]

When the said liner has a "gap" or "hole" of the time, does not mean that after curing of the tire must exist on the inner surface of the groove or recess. The following situations are possible, in other words: cracks or holes of the inner lining by the rubber formulation (the rubber formulation for the inflation gas is not permeable) filling, this may especially because of forming and the inner lining of the tire part of the adjacent rubber formulation in the tire curing process caused by the flow of the in. It is important that, in covering the inner surface of the tire is not rubber and the position of the inflation gas permeable, there is still the area of the slit or hole.

[61]

In this case, "the inner surface of the tire" expressed when the tire is mounted to the rim and is inflated, the inflation gas is intended to contact the surface of the tire.

[62]

Figure 1 diagrammatically described according to the prior art of a tubeless tire 10. Tire 10 including the crown, the crown extending radially outwardly from the two side walls of the side walls 30 and 30 of the two radially inner side of the bead 20, the tire crown comprising a crown reinforcing piece (in the Figure 1 not visible), by a tread states the embryo crown reinforcing member 40 from the top covering.

[63]

Figure 2 describes the different according to the state of the art of a tubeless tire 10 three-dimensional partial view, and shows the various parts of the tire. Tire 10 includes a "lining" 50, carcass reinforcing member 60 and two bead 20, 50 "inner liner" by the impermeable rubber formulation is made of inflation gas, and covering the tire 10 the inner surface of the, carcass reinforcing member 60 is covered with a rubber formulation of the line 61 is made, each bead 20 including the tire 10 is supported on the wheel rim (not shown) of the annular reinforcing structure 70. Carcass reinforcing member 60 anchored in each bead 20 in. Tire 10 also includes tire crown reinforcing member, strong [...] member comprising two ply 80 and 90. Each ply 80 and 90 through the reinforcing element 81 and 91 is enhanced, [...] element 81 and 91 in parallel and in each layer of a cross from one layer to another layer, is formed with a circumferential direction of between 10° and 70° of the angle between. The tire further comprises radially outside of the outer reinforcement [...] hoop reinforcement 100, the hoop reinforcement and by circumferentially oriented spiral-wound reinforcing element 101 is formed. Tread 40 on the strong [...] ; it is the tread 40 so that the tire 10 with the road contact.

[64]

Figure 3 in the form of a radial cross-section is described illustratively according to the prior art tire 10 of the quarter. Tire 10 comprises a crown reinforcement [...] 25, tire crown reinforcing member by the 1st reinforcement layer 80 and 2nd reinforcement layer 90 is formed, and in the radial direction by the tire tread 40 from the top covering. Each reinforcement layer includes line reinforcement, line reinforcement of the rubber covered with a matrix formed of a formulation. Each reinforcement layer of substantially parallel to each other of a reinforcement; two layers of reinforcement to about 20° angle from one layer to another layer cross, the so-called radial tire, this point for the purposes of the technical personnel in this field are known. Tire 10 also comprises a side wall 30 and two bead 20, each bead 20 includes a circular reinforced structure 70, here circular reinforced structure 70 as the bead wire. Tire 10 also comprises a carcass reinforcement 60, carcass reinforcing member 60 from one bead 20 extending to another bead, and the bead 65 anchoring the two bead 20 in each of the. In this case, the tire body reinforcement 60 includes a substantially radial directional (that is to say, with the circumferential direction is greater than or equal to 65° and less than or equal to 90° angle) of the line reinforcement. The inner surface of the tire is covered with a lining 50. Tire 10 of the Figure mark is in plane 110.

[65]

These inner liner impermeable inflation gas in the tire may be the fact that the various problems in manufacturing. Has been observed, in particular, in the course of the manufacture of tire air trapped under may be accumulated in the lining, particularly in the renovation and radially inward of the side wall is accumulated half of, and form a gas bubble therein. Fig. 4 has shown the in the manufacture of a tire, according to prior art the problem of repeated. Display the Figure 3 of the tire 10 of the side wall 30 and the lower part of the bead 20. In the illustrated portion, the bubble 150 has been formed on the inner liner and adjacent bead 50 and between the part of the side wall.

[66]

When the tire curing mold when it leaves this kind of bubble will not only limited to exist in the as shown in Figure 3 is shown in the tire structure. In the following the tire may also be found in this kind of the bubble: wherein the carcass reinforcing member 60 does not, through crimping 65 anchored in the bead 20 in, and is composed of a plurality of annular reinforcing structure 70 support, as shown in Figure 5 is shown in. In the below, the display only has a carcass reinforcement 60 bead of the tire, but this is not restrictive of this invention feature. Each bead 20 has outermost circular reinforced structure 70. When the bead 20 having a plurality of such structure 70, (as shown in Figure 2 and Figure 5 is shown in a), the outer structure is the most far away from the axis of rotation of the structure of the tire. When the bead 20 comprising only a single structure 70 time, the term "the most outer annular reinforcing structure" to its is also suitable.

[67]

Bubble 150 of the tire prior to installation damage to the visual appearance of the user, the presence of air bubbles, however, may also be the consequences of the with the service life. Specifically, bubble may be caused by the adhesion of the inner liner will play the role of the loss. This shortcoming in fig. 6 to fig. 8 is shown in. Figure 6 shows the initial state of the tire. With the use of the tire (mean that mechanical stress and heating a plurality of cycle), the bubble 150 near, the inner lining 50 gradually separated from the adjacent tire part. Therefore, the shape and the surface area of the latter (Figure 7) change. In more severe cases, the inner lining 50 may be made from the bead 20 and separated from the internal part of the side wall, as shown in Figure 8 is shown in. This separated from the lead to some degree of sealing loss, and leads to a large number of air penetration into the material of forming a tire. Adhesion loss replacement of the customers will also be a factor of the tire.

[68]

The problem of bubble formation of the solutions include reducing the surface area covered by the lining, as shown in Figure 9 shown in the. Tire 10 comprises an inner liner 50, inner liner 50 radial inner end 51 is located in the bead 20 on the outer side in the radial direction. The special according to the literature JP4090902 and EP   1   228   900, the lining of this type is known. Naturally, the inner lining does not cover too large the area of the bubble formation, therefore, does not trap the air bubble may be formed, the risk of bubble formation is greatly reduced.

[69]

However, such a tire has a fault. Particularly has already noted, the surface area of the lining covers the reduction of the noise generated by the tire to increase, particularly in the cavity resonant mode in the frequency range. Therefore, using such a tire increases the installation of the tire of the vehicle body vibration, and reduce the comfort of the hearing of the user. Furthermore, the surface area covered by the decrease of the charging pressure with the resulting in still greater loss of time.

[70]

According to the embodiment of this invention the tire, for example, in Figure 10 the display in the tire 10, to overcome this shortcoming. Relative to Figure 9 of the tire, the only distinction lies in that the inner liner 50 extends to an annular reinforcing structure 70 of the radial height, and each one of the tire included in the side wall of the gap 200, the gap 200 in the radial direction of the annular reinforcing structure 70 and (from not described tire measurement of the spin axis) radius between RE, when the tire 10 is mounted to the rim (not shown) and inflates to its working pressure, carcass reinforcing member 60 having the same in the radius RE at the most large axial width. In this embodiment, the maximum radial height of the gap is HR 2.5 mm. In this case, gap 200 from the adjacent tire part of the flow of some of the rubber formulation filled.

[71]

It should be noted that, in the curing process in the tire of the inner lining may also there will be some flow, the effect is to reduce the radial height of the gap. In order to obtain cured state HR of the radial height of the gap, according to the of the materials used, may be required to provide the raw material under the state of slightly larger.

[72]

It has been found that, for only terminates in a circular reinforced structure 70 of the height of the lining 50, or even extend to the base of the bead 21 by the chink, however, 200 of the interrupted inner liner 50, provide such a lining 50 and a significant reduction in the inner lining 50 and adjacent the air between the tire part of related issues. Furthermore, to obtain this result will not increase the noise emitted by the tire rolling. This advantage can be interpreted by the following facts: the inner liner 50 is a lag (hysteretic), however, the rubbery material of the tyre under the less hysteresis.

[73]

Furthermore, with the covering of the surface area of the inner liner of the tire is reduced, the 20 [...] the inflation pressure of the static loss is reduced. The pattern can be measured in the 3 general structure of the tire on the tire. With such as chart 3 in the tire of the inner lining in the four-week time (static conditions, the 20 [...]) lose its 40mbar of the inflation pressure. Any of the inner lining for the same tire, total loss 65mbar. With the tire of the inner lining (e.g. FIG 9 of the tire shown in) loss 50mbar, however the tire according to the present invention (fig. 10), to reduce the loss 45mbar.

[74]

Figure 11 and Figure 12 diagrammatically show the possibility of some of the geometric shape of the gap. View corresponding to the cross-section of the circumference (in the direction perpendicular to the tire in the plane of the rotation axis) view; display by including slot 200 lining 50 covered by the inner surface of the side wall.

[75]

Figure 11 the gap 200 has 3 mm HR a constant radial height, and extends on the whole circumference of the tire. Therefore, all of the closed air are apt to discharge, there is no need to use this kind of air towards the gap the proliferation of in the circumferential direction.

[76]

As a contrast, Figure 12 the gap of tire 200 in not extending on the whole circumference of the tire, but only in slightly more than three-fourths of the circumference of the tire (α =295°) extends. The radial height of the gap 3 mm HR the maximum value, and at its end trend zero : thus gap has a crescent shape. Such gaps can be on almost the entire circumference of the exhaust air. Closed air of the remaining portion of the diffusion path is short enough, thus can be discharged in a short period of time. The gaps can be of this type through the according to embodiments of the present invention easily manufacturing process, this will be described in the following text.

[77]

As in the use in this text, the concept of "gap" is not only simple continuous gap, for example, in Figure 11 and Figure 12 the gap described in 200. It includes lining, with a row of holes in (small gap or a column) of the gap. This point in fig. 13 to fig. 15 shown in the.

[78]

Fig. 13 describes the continuous gap 200 a part of, as in Figure 11 and Figure 12 the gap described in 200. The bending of the tyre has been has carried on the abstract. Such gap having maximized the capacity of the discharged air.

[79]

Figure 14 and Figure 15 a each of the charts have described that include a row of holes 201 of the gap. In the tire in the gap extends on the whole circumference of the time, this technique may be particularly advantageous. If the gap is continuous, then in the manufacturing process, the need to address the three parts of the liner. If the inner liner is perforated, the in can be placed in the single-piece, so that the processing is easier.

[80]

The technicians of this field understand, by using advance of the perforated air-tight rubber formulation of ply, to drum or through the conventional manufacturing process is simple to assembly of the inner liner with a plurality of parts, is easy to obtain the tire according to the present invention. In principle, after the manufacturing of the tire can also be cutting gaps. However, these process has the disadvantages of not convenient. Furthermore, the cured tire comprising cutting operation, and the risk of damage to the tire. According to embodiments of the present invention these difficulties can be eliminated the process.

[81]

With the aid of Figure 16A to fig. 21C, shown of the according to the technology of the invention 1st embodiment. Only here will describe the necessary steps of the process. The strip is placed on the rigid core of the process to the technicians of this field is well known. In document EP   0   666   165 is provided in one of the example, the literature therefore incorporated as reference herein. "The C3M [...] the process corresponding to the process, briefly described the same in the 2002 year booklet published by Michelin" The Tyre   Digest " in.

[82]

Figure 16A rigid core is described illustratively 300, it can be with angular velocity ω rotation about the axis of rotation. Figure 16B and 16C I-I-section and along with respectively along the II-II (see Figure 16A) the cross section of the same rigid heat exchanger core is described. In the subsequent map, and B C part (such as 17B and 17C) respectively corresponding to the still and I-I II-II along the cross section.

[83]

Figure 17A display according to the embodiments of the invention the technological 1st step. Rubber formulation strip 400 (the width is L) through supply device 350 supply, and through a rigid core laying the placement tool 300, rubber formulation for the intended to the tire is inflated by a gas impermeable, the placement tool is known in itself, its in order to clear and did not display. Furthermore, the rigid core 300 is at a substantially constant angular velocity ω to rotate. The according to the technology of the invention 1st embodiment, placing the rigid core substantially perpendicular to the direction of the rotation axis of the initial speed substantially constant V0 travel. Literature can be for example the placement tool US   2007/0199661 in that kind of placement tool is disclosed, the content of the document is therefore incorporated as reference herein.

[84]

If rigid core 300 around its axis of rotation for the for the time of T, can then be written as

[85]

T=2Πω---(3)

[86]

In order to make a the rigid core of the strip which is placed after the part of the strip is placed in the course of the portion of the partially overlapping, the placement tool rigid heat exchanger core must be in the direction perpendicular to the direction of the axes of rotation of the travel on the distance L is less than the strip width D. Expressed in mathematical form, this corresponding to the following inequality:

[87]

D=[!Integral!]0TV0[!CenterDot!]dt=V0[!CenterDot!]T<L---(4)

[88]

If inserted into the expression (3), can then be re-write the following inequality:

[89]

2Π[!CenterDot!]V0ω<L---(5)

[90]

This condition can be through V0 and ω is the appropriate selection.

[91]

Figure 18A display when the condition (5) time, the rigid core element 300 after a transfer of the results obtained: 1st turn is placed on the strip 400 and in the 2nd part of the added on to the part of the strip overlap. If the operator continues to operate under these conditions, the whole inner liner may be provided with a to the most minute gap is placed in the way of and on the side wall of the bead of the tire.

[92]

In Figure 18A and the time display in 19A between the instant at which the display, the operator is the part of the following area in the inner liner, in the region in the radial direction between the following two positions:

[93]

-In the tire manufacturing process is completed, the radially outer annular reinforcing structure will be in the radial position, and

[94]

-When the tire manufacturing process after the completion of mounting of the tire on the wheel rim and to its working pressure, carcass reinforcing member will have its most large axial width place radial height.

[95]

In order to obtain the gap in the radial region, the placement tool to increase the moving speed V, thus

[96]

[!Integral!]0TV(t)[!CenterDot!]dt>L---(6)

[97]

Naturally, also the moving speed V can be maintained constant and reducing the rigid angular velocity ω of the core in order to satisfy this inequality (because T depends on the angular velocity ω), or by appropriately modifying the two kinds of speed the two methods combined. However, in order to obtain the best productivity, preferably of constant does not reduce the angular velocity of the mobile speed ω and V.

[98]

In Figure 19A time in the description, have begun to form a gap. The time and in the Figure the 20A between the moment described in, the operator once again change the moving speed V (and/or the angular velocity of the rigid heat exchanger core ω), in order to satisfy the following inequality:

[99]

[!Integral!]0TV(t)[!CenterDot!]dt<L---(7)

[100]

Once again, the same is to the continuous portion of the strip overlapping.

[101]

Figure 20A, Figure 20B and 20C gap thus obtained is shown 200.

[102]

Subsequently, the operator while satisfying the inequality (7) is under the condition of the strip is continued.

[103]

Therefore, obtained in the above-mentioned radial region of the crescent-shaped gap 200. In this case, gap 200 at about 300° is extended.

[104]

According to the technology of the invention with this embodiment of the the disadvantage of, corresponding to the picture 21A regional 500 and a small portion of the bead is not covering the inner liner. According to the present invention of the process of the 2nd embodiment (in fig. 22 to fig. 24 in certain of its steps is described) this shortcoming can be overcome.

[105]

Starting point equivalent to Figure 17. Different with the 1st embodiment, the placement tool to 1st in almost the whole duration of the travel almost no. On the turning completed shortly before, the placement tool rigid core in the direction perpendicular to the direction of the axes of rotation of the mobile. In order to generate the overlap, the mobile must be less than the width of the strip l. Furthermore, reached in the Figure 22 position in the description. Therefore, will be of the bead of the tire corresponding to the entire part of the are covered with the lining.

[106]

Figure 23 described after the rigid heat exchanger core to the case of 2nd. The prior step different, the placement tool has moved more than the distance of the width L of the strip. Then form the initial part of the gap.

[107]

In Figure 24 the display clearly in a slot 200, Figure 24 shows the situation after the additional one turn. Once again, in the additional a placement tool at the end of the movement of the strip L is smaller than the width of the: gap thus completed 200.

[108]

The remaining portion of the inner liner is placed, in each revolution at the same time maintain the movement of the placement tool l. smaller than the width of the strip

[109]

Figure 25 and Figure 26 for the described two embodiments of the process, the mobile at any time the placement tool.

[110]

Figure 25 shows the process of the present invention according to the 1st embodiment (Figure 18A-Figure 21C), the movement of the placement tool D at any time. In addition to the initial in the gap corresponding to the outside in the process of (rotation cycle T2), tools running at a constant speed (core rotation cycle of T1, T3, T4), the corresponding initial in the gap of the increasing speed in a rotary process, so that the in the course of the rotary movement of the placement tool l. exceeds the width of the strip

[111]

Figure 26 shows the process of the present invention in accordance with the 2nd embodiment (Figure 22-Figure 24), the movement of the placement tool D at any time. In addition to the rigid core to the end of each of the outside, the placement tool does not travel. The gap to be generated, at the end of the each of the mobile must exceed the width of the strip to the l.

[112]

Naturally, the placement tool provide a rigid core and the movement of the more complex, according to the present invention can be the two embodiments are combined. However, the basic principle remains the same: is produced when reaching the desired area of the gap, the rigid core and the movement of the respective placement tool change, thus of the core body in a rotary process, the placement tool travel in a radial direction greater than the distance of the width of the strip to be placed.

[113]

Although not described, can also provide a kind of from the rigid core and facing to the outer side along the radial direction of the core to travel radially on the inside of the placing mode.



[114]

Tubeless tire, adapted to be inflated with an inflation gas, comprising: a crown (25) comprising a crown reinforcement (80, 90) surmounted by a tread (40); two sidewalls (30) extending the crown radially inwards; two beads (20) radially inside the sidewalls and each comprising a annular reinforcement structure (70); a carcass reinforcement (60) anchored in each of the beads; an inner-liner (50) impermeable to the inflation gas, covering the inner surface of the tire; wherein, in each sidewall of the tire, the inner-liner comprises at least one slit (200), situated radially between the annular reinforcement structure that is radially outermost, and the radius RE at which the carcass reinforcement, when the tire is fitted to the rim and inflated to its operating pressure, has its largest axial width, the slit having a maximum radial height HR of between 0.5 and 5 mm and extending over at least half of the circumference of the tire. Also disclosed is a process for manufacturing such a tire.



1. A tubeless tire, the inflated inflation gas for, the tire, comprising:

Crown (25), said tire crown comprising a crown reinforcing member (80, 90), the fetus crown reinforcing member by the tire tread (40) is covered from the top;

Two side walls (30), so that said side wall extends radially inward in the tire crown;

Two bead (20), the bead the radially inner side of the sidewall, each bead includes at least one annular reinforcing structure (70);

Carcass reinforcing member (60), the fetus body reinforcement in anchored in each bead; and

Lining (50), the liner can not be penetration of inflation gas, and covering the inner surface of the tyre;

Wherein each of the stated tire in the side wall, the liner including at least one aperture (200), the gap in the radial direction is located between two of the following:

(I) radial, the outermost circular reinforced structure, and

(Ii) when the tire is mounted to the rim and when the inflatable to its operating pressure, the fetus body reinforcement has at its most macro RE to the width of the radius of the; and

Wherein the gap is between 0.5 and 5 mm of the maximum radial height between HR, and the gap in the said tire is on at least half of the circumference of the extension.

2. Tire according to Claim 1, wherein the gap (200) in the tire of at least three fourths of the circumference of the upper extension.

3. Tire according to Claim 1, wherein the gap (200) in the extending on the whole circumference of the tire.

4. Any of the tyre according to Claim 1 or 2, wherein the gap (200) at its end radial height of the tend to zero.

5. Any of the tyre according to Claim 1, wherein the gap (200) is continuous.

6. To 3 any of the tyre according to Claim 1, wherein the gap (200) is included in the liner (50) with an array of holes in (201).

7. A method for manufacturing according to Claim 1, 2, 4 or 5 of the process of the tire, said tire inner liner (50) is through the rubber formulation strip (400) is placed in the rigid core (300) and production, the rubber formulation used for the tire is inflated by a gas impermeable, the rigid core around the axis of rotation at a selected angular velocity ω, the strip width is L, and by means of a placement tool is placed in the rigid core body, wherein the process comprises the following steps:

In the course of the operation, the moving speed of the in order to select the V substantially perpendicular to the rigid in the direction of the rotation axis of the core body of the placement tool moves on, thus because the rigid core with states ω is the angular velocity of the moving speed V of the tool, so that the rotation of said rigid core is placed at the end of the strip and in a portion of said rigid core is the starting point of the same in contact with a part of the strip, but not overlapping, or their includes the overlap also of contact between; and

The placement tool temporarily change the moving speed of the rigid and/or the angular speed of the core body, so that the rigid core is not a part of the covering strip, wherein a portion of the liner in the radial direction is located between two of the following:

(I) after the completion of the manufacturing process of the tire, the radial the most outer annular reinforcing structure will be in the radial position, and

(Ii) when the tire manufacturing process after the completion of mounting the tire on the wheel rim and to its working pressure, carcass reinforcing member will have its most large axial width place radial height,

The speed change of the above-mentioned part of states the inside lining in the process of placement.