A method of manufacturing a carcass structure for tyres, in particular for two-wheeled vehicles, and a carcass structure for tyres

 

The invention relates to the tire industry, in particular for the manufacture of tyres for two-wheeled vehicles such as motorcycle tires. In the method of manufacturing a frame structure for these tires perform band-shaped section with a longitudinal filiform elements, covered with a layer of raw elastomer, which is placed on a toroidal support, forming when laying around the U-shaped contour of the cross section of the two side parts. Then impose two crown pieces passing along the radius from the center between the side parts, and put an annular reinforcing structures near the edges of one layer of the carcass. The performance of each annular reinforcing structure comprises an imposition of one extended element in concentric coils to form a ring siteplease insert in the form of a code. Then carry out the formation of a filling body of raw elastomer and connect it with the ring siteplease insert. This method performs a frame structure for a tire and a tire for two-wheeled vehicles having a frame structure made by the proposed method. The invention allows to obtain a reinforcing structure in the boards, especially the finding relates to the method of manufacturing a carcass structure for tyres, in particular for two-wheeled vehicles, comprising stages: training ribbon-like sections, each includes a longitudinal and parallel thread elements at least partly coated with at least one layer of the original elastomer; manufacturing at least one layer of the carcass by blending and distribution around the circumference of these ribbon-like sections on the toroidal support, each of these ribbon-like sections is held in a U-shaped configuration around the contour of the cross section of the toroidal support to define two side parts, mutually spaced at a distance from each other in the axial direction, and a crown portion, passing in a remote radius from the center of the space between the side parts; application of annular reinforcing structures to the area near the inner circular edges of the specified at least one layer of the carcass.

The invention also relates to a frame structure for tyres produced by the above method, where the specified frame structure comprises at least one carcass layer comprising ribbon-like sections, circumferentially distributed around the geometric axis of rotation, when e is entrusted to each other and at least partially covered with at least one layer of raw elastomer, each of these ribbon-like sections takes place in essentially U-shaped configuration around the contour of the cross section of the frame structure to define two side parts spaced at a distance from each other in the axial direction, and a crown portion, passing in the distant radially from the center position between the side parts.

The manufacture of tyres for the wheels of vehicles includes the education of frame structure, mainly made of one or more layers of the framework essentially toroidal shape having oppositely positioned along an axis lateral edge which engages with the corresponding unable to stretch in the circumferential direction of the annular reinforcing elements, usually called "air rings".

Around the circumference in a place distant from the centre, on a frame structure superimposed belt structure containing one or more belt strips in the form of a closed ring, mainly consisting of textile or metal cords, properly oriented with respect to each other and to Kardam related to the adjacent layers of the framework.

Sacrificial layer, currently consisting of strips of elastomer p> It should be noted that to explain the objectives of the present invention, the term "elastomer" refers to a rubber mix in its entirety, i.e., assumes that the node has made at least one polymer, respectively, are combined with reinforcing fillers and/or process additives of various types.

Finally, to the opposite sides of manufactured tires make a pair of sidewalls, each of which covers a side portion of the tire between the so-called shoulder area, located near the respective side edges of the sacrificial layer, and the so-called Board located near the respective side of the ring.

In accordance with the traditional methods of production, as a rule, these components tyres are first manufactured separately from each other, and then to be collected during the stage of manufacture of the tires.

The applicant believes that these methods of production are, at least partly unsatisfactory in terms of quality of the final product and that there are some critical issues regarding the implementation process, which is complicated and poorly managed.

For example, alum is crawled first by using extrusion and/or calendering process to obtain rubberized fabric, containing spaced longitudinally continuous textile or metal cords. This rubberized fabric is subjected to the operation of the cross-cutting to obtain sections of pre-defined size, which are then connected to each other to provide a continuous ribbon of material with transversely spaced parallel cord.

Then this product is cut into sections, the length of which corresponds to the circumferential length of the manufactured frame.

In addition, have been proposed methods of manufacture, in which instead of the production of semi-finished frame structure is produced directly during the production stage of the tire.

For example, in U.S. patent 5362343 presents a method and apparatus for forming a frame layer, starting with a single cord thread, pre-wound on a reel.

In accordance with the method and installation are described in the aforementioned patent, at each operating cycle of the installation cord thread drained from the coil with the drive rollers and supported by a system of pneumatic tensioning, cut with a receiving section of a predetermined length.

KORD is otrivaetsa in the transverse direction on the outer surface of the toroidal support.

Then the ends of the section gear using Flexural elements belt type operating on opposite sides of the toroidal support, for radial cord application section to the toroidal support by means of slide elements, functioning similarly to the fingers along the side parts of the cord sections.

The repetition of the above described operating cycle leads to the laying of a number of cord sections arranged circumferentially in a row, closely one to another, until the entire circumferential length of the toroidal support will not be covered.

Toroidal support must be covered with a layer of raw rubber that performs a dual function, i.e., the clutch cord yarns laid on it in order to hold them in fixed predetermined locations, and education airtight inner shell in the finished tire.

Tires, obtained by this method of manufacture, have a frame structure in which the layer or layers of the framework consist of a separate cord yarns, each has two side parts spaced at a distance from each other in the radial direction relative to the axis of rotation of the tire, and the crown part, held in place, the remote radius between boovytvorene the ends of the separate cord yarns, forming a carcass layer, are placed in alternating sequence in the opposite locations along the axis relative to the annular SitePlayer element forming the specified bead ring shaped arch made of wire coils, radially superimposed on each other, as can be seen from the European patent 0664231 and U.S. patent 5702548. In accordance with the provisions of these documents filling body of elastomer should be placed between siteplease ring and thread or wire forming the layer or layers of the framework.

In French patent 384231, which is here referred as an example, most expressing the state of the prior art, a method of performing frame structure, which includes laying on the toroidal support of a number of narrow rectangular strips of rubberized fabric, have a circumference in a range very close to each other and placed in radial planes relative to the geometric axis of the support drum. Lining the narrow lanes carried out so that the end flaps of the two, not successive narrow strips partially covered end flaps narrow strips placed between them. Awesome, attached to the end flaps of narrow strips, placed in position, overlap. Lining the narrow lanes carried out in various stacked layers, the number of which is associated with a given thickness of the frame structure. The presence of these keystone inserts leads to an increase in the thickness of the frame structure side parts, so that the thickness of the bead rings is doubled in comparison with the thickness of the crown part.

In U.S. patent 4248287 disclosed method, according to which the formation of the frame structure involves the step of superimposing on the toroidal drum a certain number of layers, with each layer formed of radial tape, made of rubber tape and located on a circle very close to each other in series. After laying two side rings impose on the part of the Board, and around these rings turn back the end flaps of the casing plies formed from a radial tapes.

The applicant has found that obtaining significant advantages can be achieved by simplifying the manufacturing processes and improve operational characteristics of the tires, if the layer or layers of the framework to obtain by conventional blending hard toroidally support the ribbon-like Stomer.

In this regard, the applicant has already developed several different methods of production, which are the objects of the invention related applications for European patents.

For example, in applications 97830731.2 and 97830733.8 for the European patent disclosed accordingly, the production method and the tire, where the frame structure is manufactured by creating the first and second frame layers, with each layer formed ribbon-like sections, sequentially superimposed on a circle very close to each other in a row.

Tyres are obtained in accordance with the descriptions of the above patent applications are end flaps ribbon-like sections belonging to the first and second layers of the frame, located respectively on opposite sides relative to the annular reinforcing structures of the boards.

This technique in combination, respectively, with cross-orientation of the ribbon-like sections belonging to one and the other layers, provides significant advantages relative to the structural strength of the tire near the bead and sidewalls.

In the application 98830472.1 at the European patent in the name of the same applicant proposed a method of performing frame layer comprising a first strip and vtorogo series, end on respectively opposite sides relative to the reinforcing structures at the sides.

Therefore, it is possible to gain significant advantages in the structural strength of the flanges and the side of the bus even if there is only one layer of the carcass.

In accordance with the present invention found that the above-mentioned new production methods developed by the applicant, and providing all the advantages of the aspects associated with them can be successfully used in the production of tyres for motorcycles, etc. if you choose a special design techniques in the manufacture of reinforcing structures at the sides.

In more detail, the applicant became aware of the fact, namely, that by using the developed method of designing suddenly it is possible to obtain a satisfactory degree of structural strength at the sides, even when using reinforcing structures containing a single annular insert formed from at least one extended element wound in a radially stacked turns. In addition, the applicant has found that the frame structure with the annular reinforcing structures on the sides especially suitable for the manufacture of tyres for mototsikletnyi partitions on the hard toroidal support.

In more detail, the invention relates to a method of manufacturing a carcass structure for tyres of vehicles with an engine, wherein the execution of each annular reinforcing structure includes the steps of blending at least one extended element in concentric coils for the formation of ring siteplease insert essentially in the form of a code, education at least one filling body of raw elastomer compound filling the body with the specified ring siteplease insert.

In the preferred embodiment, execution of the specified layer frame includes a stage of blending on the toroidal support the first row of these ribbon-like sections, distributed around the circumference with a circular step, corresponding to the ratio of the width of the ribbon-like sections; application of these annular reinforcing structures against end flaps of these ribbon-like sections belonging to the first row; overlay on the toroidal support at least one of the second row of these ribbon-like sections, each held in a U-shaped configuration around the contour of the cross section of the toroidal support between the two posledovatelya lapels, overlying the respective annular reinforcing structure in the opposite direction of axis location relative to the end flaps of the sections of the first row.

In addition, it is desirable to ensure that the crown part of the ribbon-like sections were arranged in series next to each other in a row along a circumferential extension of the toroidal support.

In addition, it is desirable that the side of each ribbon-like sections belonging to the first row, were partially covered, each side part of at least one following the circumference of the section related to the second row, under tension, between directed along the radius of the outer edge of the annular reinforcing structure and the transition region between the side portions and crown portions.

In more detail, covering the side portions of each ribbon-like sections belonging to the first row, gradually decreases starting from a maximum value near the outer circular edge of each annular reinforcing structure to zero in the transition areas between the said side portions and crown portions.

Preferably, the sides of these ribbon-like sections radially converge at the least one working stage, aimed at defining areas of increased width near the inner circular edges of the frame structure.

If, as provided in the preferred embodiment, the preparation of these ribbon-like sections is made through cutting, consistently pursued relative to the at least one continuous ribbon-like element that includes the specified filiform elements in the specified layer of raw elastomer, the stage of the job areas of increased width may preferably be implemented relatively continuous ribbon-like element to the implementation of the cutting operation.

In accordance with an additional aspect of the invention specified extended element preferably imposed directly opposite the layer frame, and more preferably opposite end flaps ribbon-like sections belonging to the first row, forming limit siteplease box directly in contact with the ribbon-like sections.

Filling the body, preferably located in a remote radius location relative to the specified ring siteplease insert, can be, in turn, is formed by applying a continuous ribbon of elastomer is m ribbon-like sections, related to the first row.

An additional object of the invention is a frame structure for tyres of vehicles, characterized in that it further comprises a pair of annular reinforcing structures which engages on the site, close to respective inner circumferential edges of the layer frame, and each structure includes an annular siteplease box, essentially in the form of a code that is located coaxially with the frame structure and adjacent to the inner circumferential edge of the layers of the frame, with the specified ring saralaya insert is formed of at least one extended element extending in concentric coils; filling the body of raw elastomer, United with the specified ring siteplease insert.

More specifically, the said carcass layer is preferably formed containing the first and second rows of ribbon-like sections arranged in a mutually alternating sequence along the circumferential length of the frame structure, each of these annular reinforcing structures is in the direction of the axis of the inner side turned towards end flaps of the sections belonging to the first p is on the second row.

Preferably the crown with respect to the sections of the first and second rows, respectively, are mutually close to each other along the circumferential length of the frame structure.

Side of each ribbon-like sections belonging to the first row can be formed so that each was partly covered with a side part of at least one adjacent ribbon-like sections belonging to the second row, land, existing between directed along the radius of the outer edge of the annular reinforcing structure and the transition region between the side portions and crown portions.

In more detail, covering the side portions of each ribbon-like sections belonging to the first row, gradually decreases starting from a maximum value at the site near the outer circular edge of each annular reinforcing structure to zero in the transition areas between the said side portions and crown portions.

Achieving the benefits of the sides of these ribbon-like sections converge radially in the direction of the geometric axis of rotation of the frame structure.

Individual ribbon-like sections belonging to one of these the first is the criterion of the ratio of the width of themselves ribbon-like sections.

Each ribbon-like section can be formed so that it had a region of increased width at the site close to the inner circular edges of the frame structure.

In this case, the filiform elements included in each band-shaped section, are mutually spaced at a distance from each other in these areas of increased width.

Preferably, each of the ribbon-like sections has a width of between 3 and 15 mm, and contains from three to eight filiform elements.

In particular, said filiform elements are located in the respective ribbon-like sections in accordance with a mutual distance between centers of not less than 1.5 diameter of themselves filiform elements.

In accordance with an additional aspect of the invention specified ring saralaya the insert has only a number superimposed on the radius of the concentric coils.

In addition, it is desirable to provide that the specified filling body was stretched out along the radius from the specified ring siteplease insertion taper away from her.

In more detail, the relationship between the radial length of the annular siteplease insert and the filling body mainly mo is oogamous between 48 and 55oshore D at 23oC.

Additional features and advantages will become more apparent from the detailed description of a preferred, non-exclusive variant of the method of manufacturing a frame structure for tyres, in particular for two-wheeled vehicles, and frame structure obtained by the above method in accordance with the present invention. This description will be made below with reference to the accompanying drawings, is shown as not creating restrictions example, in which: Fig.1 is a fragmentary and with cuts in the perspective image of a tire carcass structure made in accordance with the present invention; Fig.2 is a diagram showing the implementation of a continuous ribbon-like element intended for the formation of a layer or layers of the frame; Fig. 3 is a cross section of a variant of implementation of the specified ribbon-like element; Fig.4 is a fragmentary perspective representation schematically showing the sequence of laying the first row of ribbon-like sections for education according to the invention the layer of the carcass in the tire in accordance with the invention; Fig. 5 is a fragmentary perspective representation ring us is - ragmentary perspective representation schematically showing the sequence strip of the second series of ribbon-like sections with respective end flaps overlapping the annular reinforcing structure.

As for the drawings, the tire, in particular for two-wheeled vehicles having a frame structure 2 in accordance with the present invention, generally denoted by reference number 1.

The frame structure 2 has at least one layer 3 of the frame, which is essentially toroidal in shape and engages its opposite circular edges with a pair of annular reinforcing structures 4 (only one of which is shown in the drawings), each of them, when the manufacture of the finished tire, is located in the area usually referred to as "the Board".

On the frame structure 2 superimposed on a circle in a place distant from the centre, the belt structure 5, containing at least one primary belt strip 7 formed from one or more continuous cords wound in coils that are located on an axis close to each other in series and essentially parallel to the direction of a circumferential length of the tire, and possibly spoi the lap belt 7. Around the circumference of the waist tape 5 imposed protective layer 8, in which, after the molding operation, performed simultaneously with the vulcanization of the tire, forming longitudinal and/or transverse grooves 8A, which have to set the desired "tread pattern".

In addition, the tire comprises a pair of so-called "sidewalls" 9 imposed laterally on the frame structure 2 on its opposite sides.

The frame structure 2 may also be coated on their inner wall of the airtight layer 10, i.e., the so-called "shell" consisting essentially of a layer of elastomer impervious to air, and is suitable for ensuring a tight seal inflated tires.

The Assembly of the components listed above, as well as the manufacture of one or more of them are produced using the toroidal support 11, schematically shown in Fig.1 and having the configuration of the inner walls of the tyre to be manufactured.

The toroidal support 11 can be smaller in dimensions compared to the dimensions of the finished tire, in accordance with a linear value between 2 and 5%, measured as a trait, along the circumferential length of the bearing, in her equatorially not defined or explained in detail, since it is not particularly important for solving problems of the invention may constitute, for example, Rethimno drum or filled with a gas of elastic chamber, suitably reinforced, so that it can accept and save the desired toroidal shape in the inflated condition.

Using the above claim, the manufacture of tyres 1 primarily includes the education of frame structure 2, starting, perhaps, with the formation of the shell 10.

This shell 10 is mainly can be produced by winding around the toroidal support 11, at least one ribbon-like narrow strips 12 of the airtight elastomer obtained from the extruder and/or calender located close to the toroidal support. As can be seen in Fig.1, the winding narrow ribbon-like strips 12, essentially, takes place with the formation of circular orbits, sequentially arranged in a row, to follow the contour of the cross section of the outer surface of the toroidal support 11.

With the purpose of clarity under "outline of the cross-section" in this case refers to the configuration identified by the cross-section of half of the toroidal support 11 is cut along the plane, the Paradise of rotation of the tire and, therefore, manufactured frame structure 2.

In accordance with the present invention the layer 3 frame formed directly on the toroidal support 11 by, as will become clearer below, the overlay of the first and second rows of ribbon-like sections 13, 14, obtained from at least one continuous ribbon-like element 2A preferably has a width of between 3 and 15 mm

As can be seen from Fig.2, producing a continuous ribbon-like element 2A, essentially, is that one or more filiform elements 15, and preferably from three to ten filiform elements 15, supplied with the respective coils 15A, are routed through the extruder 16 associated with the machine 17 for casting under pressure of performing supply of the source of the elastomer through the extruder.

You should pay attention to the fact that in the present description by "extruder" means the part of a machine for injection molding, also known in this specific technical field "extrusion head with the so-called "Villeroy", through which are passed the processed product, the outlet having a shape and dimensions in accordance with geometric and dimensional whom 15 are closely connected with each other, thereby forming on his final hole of the continuous ribbon-like element 2A, and this element is formed from at least one elastomer layer 18, the thickness of which is included themselves filiform elements.

Depending on your specific requirements you can send filiform elements 15 in the extruder 16 so that they were not included in the elastomer layer 18, forming a single whole, and appeared on one or on both of its surfaces.

Each of the filiform elements 15 is, for example, textile cord thread, preferably with a diameter between 0.6 and 1.2 mm, or metal cord thread, preferably with a diameter being between 0.3 and 2.1 mm

If you mostly filiform elements 15 can be placed inside a continuous ribbon-like element 2A in such a way that they will provide the layer 3 frame with unexpected characteristics, density, and uniformity. With this purpose, the filiform elements 15 can, for example, be placed in the thickness of in excess of six filiform elements per centimeter when measured on the circumference of the layer 3 frame near the Equatorial plane of the tyre 1. In any case, it is desirable to ensure that the filiform elements 1.5 diameter of themselves filiform elements, in order to provide operation obrezinivanie between adjacent threads.

Continuous ribbon-like element 2A, emerging from the extruder 16, can mainly be directed through optional cumulative and the compensating device 19 for the installation to cover, structure and operating characteristics of which are described in more detail in the application 97830731.2 for the European patent, registered in the name of the same applicant, the contents of which are incorporated into this description by reference.

Installation for coating allows to consistently cut the continuous ribbon-like element 2A on the ribbon-like sections 13, 14 of a predetermined length.

For cutting each ribbon-like sections 13, 14 is immediately followed by its imposition on the toroidal support 11 to give the band-shaped section in a U-shape around the contour of the cross section of the toroidal support, so in ribbon-like sections 13, 14 can be divided into two side parts 13A, 14a, which are radially towards the axis of the toroidal support 11, while at locations spaced radially at a distance from each other, and the crown portion 13b, 14b, passing in the distance along the radius from the centre, between Samanta 15, ensure the adherence of the ribbon-like sections 13, 14 on the surfaces of the toroidal support 11 even in the absence of the shell 10 on the toroidal support. In more detail, the above-described adhesion occurs as soon as the ribbon-like section 13, 14 is in contact with the toroidal support 11 in the external radius of the area of its contour cross-section.

In addition to using the natural viscosity of the elastomer or instead of the fixing of one or more ribbon-like sections 13, 14 on the toroidal support 11 can be obtained by operation of the suction produced through one or more holes formed in the toroidal support.

The toroidal support 11 can result in rotation with step-by-step movement in synchronism with the operation of the unit to cover in such a way that every action by cutting each ribbon-like sections 13, 14 is accompanied by laying her on the spot, charged on a circle at a certain distance from the previously laid sections 13, 14.

In more detail, the rotation of the toroidal support 11 is angular steps, which corresponds to the offset of the circle, fold width or, more specifically, equal to twice the width of each ribbon clubs is the term "circular" refers to the circumference, lying in the Equatorial plane and near the outer surface of the toroidal support 11.

In accordance with the present invention described above sequence of operations is performed in such a way that when the first full rotation of the toroidal support 11 around its axis is laying the first row of ribbon-like sections 13, while the section 13 are distributed on the circular steps, corresponding to twice the width of each of them. Therefore, as can clearly be seen from Fig.4, between one and the other sections belonging to the first row, left clearance "S", which, at least in the corona parts 13b of these sections has a width equal to the width of the sections.

Depending on requirements, the strip of ribbon-like sections 13 belonging to the first row, can occur in planes radial to the axis of rotation of the toroidal support 11 or parallel offset to this radial plane, as described in the application 98830778.1 for the European patent registered in the name of the same applicant.

In addition, this strip can be performed, following the inclined orientation relative to the direction of the circular length of the toroidal support is of ECCI can, for example, to ensure by appropriate orientation of the geometric axis of rotation of the drum relative to the installation for installation.

Then carry out the completion of frame structure 2 by using the stage of application of the above-mentioned annular reinforcing structures 4 in the area close to each of the inner circular edges of the produced layer 3 frame, with the aim of obtaining areas of the frame, known as the "Board" specifically designed to ensure engagement of the tire with a corresponding mounting rim.

Each of these annular reinforcing structures 4 preferably contains a separate ring siteplease box 21, which, essentially, is inextensible in a circular direction and essentially has the shape of a crown concentric with the geometric axis of rotation of the toroidal support 11, while this box is located on the circumference at a location proximate to the center of the opposite end parts of the ribbon-like sections 13 belonging to the first row.

Ring saralaya insert 21 is made of at least one elongated metal element wound in several essentially concentric coils 21A. The coils 21A can be made in with elements.

Ring siteplease insert 21 is combined filling body 22 of elastomer, preferably a thermoplastic type, with a hardness of between 48 and 55oshore D, measured at a temperature of 23oWith the filling body preferably has a radial length greater than the radial length of the annular siteplease insert 21.

Preferably the filling body 22 is placed in a remote radius location relative to the ring siteplease insert 21. In more detail, the filling body 22 is directed along the radius of the inner edge connected to the ring siteplease insert 21 and elongated along the radius, tapering in the direction from the annular insert. Preferably the ratio between the radial length of the annular insert 21 and the radial length of the filling body 22 is between 0.5 and 2.5.

To solve problems of the present invention under radial length" refers to the difference between the maximum radius and minimum radius, measured on directed along the radius of the outer edge and directed along the radius of the inner edge of the filling body 22 and/or the ring siteplease insert 21.

In accordance with the pre is in end flaps ribbon-like sections 13 through education coils 21A with the winding longest element by means of rollers, that is optional, or other suitable devices that have an impact in relation to the surface of the toroidal support 11.

The viscosity of the elastomeric layer 18 covering the ribbon-like sections 13 belonging to the first row, and optionally the shell 10, the previously imposed on the drum itself, guarantee a stable position of the individual coils 21A at the stage of their education.

In addition, the long strip element may preferably be preceded by a stage of obrezinivanie, which itself extended element covers at least one layer of raw elastomer that in addition to providing good adhesion rubber-metal longest element contributes to the grip of himself.

In turn, the filling body 22 can then be formed in direct contact with the annular siteplease insert 21 by, for example, application of a continuous ribbon of elastomer, leaving the extruder, located near the drum 11. The continuous strip may have in cross section the final shape of the filling body 22 is already at the exit from the respective extruder. Alternatively, the continuous strip has a reduced cross-section relative to the cross-section of the filling bodies is overlapping, in order to get the filling body 22 in its final configuration.

After application of the annular reinforcing structures 4 the formation of a layer 3 frame ends with a strip of the second series of ribbon-like sections 14, which is produced by cutting a continuous ribbon-like element 2A to the desired size and superimposed on the toroidal drum 11 in the same way as described for ribbon-like sections 13 belonging to the first row.

As is clear from Fig.6, each section 14 belonging to the second row, arranged in the form of a U-shaped configuration around the contour of the cross section of the toroidal support 11 between two consecutive sections 13 belonging to the first row, and with orientation parallel to the specified sections. In more detail, each section 14 belonging to the second row has a corresponding crown portion 14b located circumferentially between the crown portions 13b of sections 13 belonging to the first row, in order to fill the space "S" between them, and a pair of side parts 14a with the end flaps of the sections are in overlapping with respective annular reinforcing structures 4 in places, opposite axis relative to the end flaps clubs is icenii tapering at a distance from the axis of the tire, has in the axial direction of the inner side turned towards end flaps ribbon-like sections 13 belonging to the first row, and the outer side in the axis direction, turned towards the end flaps of the sections 14 belonging to the second row.

In addition, it is possible to provide that the side parts 14a of each section 14 belonging to the second row, partially covered side parts 13A two consecutive sections 13 belonging to the first row of each plot between directed along the radius of the outer edge of the respective annular reinforcing structure 4 and the transition region between the side part and the crown part 13b, 14b.

Due to the mutual rapprochement adjacent side parts 13A, 14a, which are oriented radially relative to the geometric axis of the toroidal support 11, overlapping or covering the side parts 13A of sections 13 belonging to the first row, i.e., the circumferential width of the area of overlap gradually decreases starting from a maximum value near the radially directed outer edge of the first portion 4A of each annular reinforcing structure 4 to zero in the transition region between the side parts 13A, 14a and crown portions 13b, 14b.

If brogo and second rows, respectively, you can include the step of pressing done on a continuous ribbon-like element 2A on the sections of the longitudinal length corresponding to the ends of the ribbon-like sections 13, 14, obtained by cutting. Thus, the set spans width of each ribbon-like sections 13, 14, which are located close to the inner circular edge formed by the layer 3 frame.

Impact extrusion causes a decrease in the thickness of the elastomeric layer 18 and increases the width of the ribbon-like element 2A, which results in the increase of the distance of mutual explode filament elements 15. While the end flaps of each section 13, 14 can be expanded up until they reach their spaced around the circumference of the inner ends of the width, which is even two times greater than the width of the crown portions 13b, 14b, and in all cases will not be able to fully overlap the respective inner and outer sides of each annular reinforcing structure 4.

In the tires of the radial type belt structure 5 is usually put on the frame structure 2.

This belt structure 5 can be made in any manner convenient for a person skilled in the field of technology and it, poppering Corda, in coils, located on an axis close to each other in a row on the layer 3 frame. Together with the specified main belt belt 7 can also include additional reinforcing layers; they can be made from strips of fabric and/or felt materials, i.e., layer compositions with short reinforcing fibers, such as aramid.

In the present example, the belt structure further comprises first and second auxiliary waist belt 6A, 6b, having cords respectively transversely oriented, located near the radius to the center relative to the main tape 7.

Then on the belt structure 5 impose protective layer 8 and the sidewalls 9, which also can be obtained in a way suitable for specialists in this field of technology.

Now therefore made the tire 1 after removal from the support 11 to pass to the stage of vulcanization, which can be accomplished in any known and convenient manner.

The use of the present invention can achieve the following advantages.

In fact, the frame structure in accordance with the invention can be obtained directly on a toroidal support, which mainly can be made su is s are common for production processes according to the traditional concept, eliminated.

Compared with the method described in U.S. patent 5362343, you can significantly reduce the production time of each layer of the structure due to the simultaneous blending of many filamentary elements, because they are contained in each ribbon-like section 13, 14 or in a continuous ribbon-like element 2A, which are sections 13, 14. The use of ribbon-like sections 13, 14 also eliminates the need for pre-built shell 10 on the toroidal support. In fact, the elastomeric layer 18 used in the formation of a continuous ribbon-like element 2A itself is able to guarantee the effective coupling element 2A with toroidal support 11, thereby providing a stable position separate sections 13, 14.

The accuracy of the location of the ribbon-like elements 13, 14 and filiform elements embedded in them, rises further due to the fact that each band-shaped section has considerable structural stability, which makes it insensitive to vibrations or similar vibrational effects that can be transmitted from installation to strip layers.

In this regard, it should be noted that the construction of separate cords, as described in pateena stage strip.

In addition, the simultaneous laying of a quantity of filamentary elements in accordance with the invention provides the possibility of reducing the speed of installation for installation compared with when laying separate cords, which is an additional advantage in terms of precision work without, on the other hand, deterioration of performance.

In addition, the strip of ribbon-like sections directly in the form of a dome on the toroidal support with rim, essentially identical to the contour of the finished tire, provides the possibility of obtaining thickness measurements, which are not attained, known from the prior art methods, allowing you to lay the carcass layer in the form of a cylindrical sleeve and subsequently give it a toroidal shape with a decrease in the thickness of the cord layers of the frame, arranged in the form of a dome in the finished tire.

In addition to the above, each ribbon-like section can stably be attached to the toroidal support with the help of vacuum that is created possible through the suction channels, and it is stable fastening of the vacuum cannot be achieved by known methods, in which Proclus is m inclination relative to the direction, radial to the axis of the toroidal support, which will effectively promote the expansion experienced by the tire during stage stretching, she reported during vulcanization. In fact, under these conditions, the side parts 13A, 14a tend to be oriented in a plane radial to the bus, under the effect of expansion communicated to the bus.

Constructive and structural concepts under consideration tires, especially in terms of frame structure 2, can achieve important improvements in terms of structural strength, in particular in relation to the side walls and the sides, which usually require high structural strength, and also in terms of road performance, while at the same time benefits from all the advantages usually true for single-layer frame structure.

In particular, the design features of the inextensible annular structures 4, and the ways in which they are embedded in the layer 3 frame, provide the possibility of bus 1 good structural strength, along with a significant limitation to the thickness of the tire at the sides, which corresponds to the typical requirements for motorcycle tires.

In fact, not capable and focused, essentially perpendicular to the filiform elements 15 belonging to different rows of ribbon-like sections 13, 14, provides good adhesion with themselves filiform elements. Therefore, the frame structure 2 is substantially strengthened in the areas corresponding to the side of the bus, without the need for a band-shaped inserts, usually called "strip Board" wound up moving the site around the annular reinforcing structures 4, which, by contrast, are used in the prior art.

Claims

1. A method of manufacturing a carcass structure for tyres, in particular for two-wheeled vehicles, comprising stages perform the ribbon-like sections (13, 14), each includes a longitudinal and parallel thread-like elements (15) at least partially covered with at least one layer of raw elastomer, making at least one layer (3) of the framework by applying these ribbon-like sections (13, 14) on the toroidal support and distribution around the circumference, each of these ribbon-like sections (13, 14) held in U-shaped configuration around a path transverse of cecenia in the axial direction, and the crown portion (13b, 14b), passing in a remote radius from the center of the space between the side parts (13A, 14a), the application of annular reinforcing structures (4) to the area near the inner circular edges of the specified at least one layer (3) of the frame, wherein the execution of each annular reinforcing structure (4) includes the steps of blending at least one extended element in concentric coils (21A) in order to form ring siteplease insert (21), essentially in the form of a code, forming at least one filling body (22) of raw elastomer, the compounds of the filling body (22) with the specified ring siteplease insert (21).

2. The method according to p. 1, characterized in that the execution of the specified layer (3) of the frame includes the steps of blending on the toroidal support (11) of the first row of these ribbon-like sections (13), distributed around the circumference with a circular step, corresponding to the ratio of the width of the ribbon-like sections (13, 14), the application of these annular reinforcing structures (4) against end flaps of these ribbon-like sections (13) relating to the first row of the overlay on the toroidal support (11) at least one of the second number listed is of the toroidal support (11) between two consecutive sections (13) of the first row, in order thereby to indicate the specified layer (3) of the frame, each of the sections (14) of the second row has end flaps overlying respective annular reinforcing structures (4) in the opposite direction of the axis relative to the end flaps of the sections (13) of the first row.

3. The method according to p. 2, wherein the crown portion (13b, 14b), ribbon-like sections (13, 14) arranged in series next to each other in the row direction of the circular length of the toroidal support (11).

4. The method according to p. 3, characterized in that the side parts (13A) of each ribbon-like sections (13) relating to the first row, partially covered each lateral part (14a) of at least one, following the circular section (14) belonging to the second row on the plot between directed along the radius of the outer edge of the annular reinforcing structures (4) and the transition region between the side parts (13A, 14a) and the specified crown parts (13b, 14b).

5. The method according to p. 4, characterized in that the coating of the side parts (13A) of each ribbon-like sections (13) relating to the first row, gradually decreases starting from a maximum value near the outer circular edge of each annular reinforcing statemi (13b, 14b).

6. The method according to p. 1, characterized in that the side parts (13A, 14a) of the said ribbon-like sections (13, 14) converge radially in the direction of the geometric axis of rotation of the toroidal support (11).

7. The method according to p. 1, characterized in that it further comprises a stage of the job areas of increased width near the inner circular edges of frame structure (2).

8. The method according to p. 7, characterized in that the performance of these ribbon-like sections (13, 14) occurs through the implementation of cutting sequentially performed relative to at least one continuous ribbon-like element (2A) that includes the specified thread-like elements (15) in the specified layer of raw elastomer (18), with the specified job step regions of increased width exercise relatively continuous ribbon-like element (2A) prior to slicing.

9. The method according to p. 1, characterized in that the longest element directly impose on the layer (3) of the framework.

10. The method according to p. 2, characterized in that the longest element directly impose opposite end flaps ribbon-like sections (13) relating to the first row, in order to form ring siteplease starcasino filling body (22) is placed in a remote radius location relative to the ring siteplease insert (21).

12. The method according to p. 1, characterized in that the filling body (22) is formed by applying a continuous ribbon of elastomer directly against previously imposed annular siteplease insert (21), so that the specified connection takes place simultaneously with the formation of the filling body (22).

13. A carcass structure for tyres, in particular for two-wheeled vehicles containing at least one layer (3) frame that includes a ribbon-like sections (13, 14), circumferentially distributed around the geometric axis of rotation, each contains at least two filiform element (15) arranged in the longitudinal direction and parallel to each other and at least partially covered with at least one layer of raw elastomer (18), each of these ribbon-like sections (13, 14) is essentially U-shaped configuration around the contour of the cross section of the frame structure to define two side portions (13A, 14a), spaced at a distance from each other in the axial direction, and a crown portion (13b, 14b), passing in a remote radius from the center of the space between the side parts (13A, 14), characterized in that it further comprises a pair of annular edges of the layer (3) of the frame, each includes an annular siteplease insert (21), essentially in the form of a code that is located coaxially with the frame structure (2) and adjacent to the inner circular edge of the layer (3) of the frame, with the specified ring saralaya insert (21) is formed from at least one extended element extending in concentric coils (21A), and the isolating body (22) of raw elastomer, United with the specified annular cushioning insert (21).

14. Frame structure on p. 13, characterized in that the layer (3) of the frame includes first and second rows of ribbon-like sections (13, 14) arranged in a mutually alternating sequence along the circumferential length of the carcass structure (2), each of these annular reinforcing structures (4) is in the direction of the axis of the inner side turned towards end flaps of the sections (13) relating to the first row and in the direction of the axis of the outer side turned towards end flaps of the sections (14) belonging to the second row.

15. Frame structure on p. 14, wherein the crown portion (13b, 14b) relating to sections (13, 14) of the first and second rows, respectively, are spatoulas fact, what side part (13A) of each ribbon-like sections (13) relating to the first row, partly covered with a side part (14a) at least adjacent ribbon-like sections (14) belonging to the second row, land, existing between directed along the radius of the outer edge of the annular reinforcing structures (4) and the transition region between the side parts (13A, 14a) and the specified crown parts (13b, 14b).

17. Frame structure on p. 16, characterized in that the coating of the side parts (13A) of each ribbon-like sections (13) relating to the first row, gradually decreases starting from a maximum value at the site near the outer circular edge of each annular reinforcing structure (4) to zero in the transition areas between the said side parts (13A, 14a) and the specified crown parts (13b, 14b).

18. Frame structure on p. 13, characterized in that the side parts (13A, 14a) of the said ribbon-like sections (13, 14) converge radially in the direction of the geometric axis of rotation of the frame structure (2).

19. Frame structure on p. 14, characterized in that the individual ribbon-like sections (13, 14), related to the first or second row, respectively, primarily from Arcana structure on p. 13, characterized in that each ribbon-like section (13, 14) has a region of increased width at the site close to the inner circular edges of frame structure (2).

21. Frame structure on p. 20, characterized in that the thread-like elements (15) that are included in each ribbon-like section (13, 14) are mutually spaced at a distance from each other in these areas of increased width.

22. Frame structure on p. 13, characterized in that each of these ribbon-like sections (13, 14) has a width of between 3 and 15 mm

23. Frame structure on p. 13, characterized in that each of these ribbon-like sections (13, 14) contains from three to eight thread-like elements (15).

24. Frame structure on p. 13, characterized in that the said filiform elements (15) are located in the respective ribbon-like sections (13, 14) in accordance with a mutual distance between centers, which is not less than 1.5 times the diameter of themselves filiform elements.

25. Frame structure on p. 13, characterized in that the annular saralaya insert (21) is the only number imposed by the radius of the concentric coils.

26. Frame structure on p. 13, characterized in that the filling body (22) has a Frame structure on p. 13, characterized in that the ratio between the radial length of the annular siteplease insert (21) and the filling body (22) is between 0.5 and 2.5.

28. Frame structure on p. 13, characterized in that the filling body (22) of the elastomer has a hardness of between 48 and 55 shore D at 23 C.

29. Tyre, in particular for two-wheeled vehicles having a frame structure made in accordance with one or more of the preceding paragraphs.

Priority items:

31.07.1998 - PP.1-10, 12-24, 26, 28, 29;

19.04.1999 - PP.11, 25, 27.

 

Same patents:

Pneumatic tyre // 2120388

The invention relates to the tire industry and can be used in the manufacture of radial tires

The invention relates to pneumatic tires and, in particular, to the design of the tread of the tires of radial construction

FIELD: tire industry.

SUBSTANCE: the invention is pertaining to the field of tire industry and may be used for making tires. The sectional toroidal support contains a set of sections precisely centered on a circumference around a geometrical basic axis and forming an exterior surface essentially reproducing an internal conformation of the treated tire. The sectional support contains a flange, on which there is at least one fastening element for engagement with a manipulating device and a counter flange operatively coupled to the flange in an axially opposite position. The sectional support contains the hutching devices for motionless retention of the sections between the flange and the counter flange. Each of the sections has a main body with essentially a U-shaped contour in its cross section, which is limited on one side by the external side forming an external surface and by the internal side facing the geometrical basic axis. The devices of hitching contain for each of the sections at least one fastening plate radially protruding from the internal side practically in a plain perpendicular to the indicated geometrical basic axis and a made with a capability of a removable hitching in an axial position between the flange and the counter flange. The invention is aimed at development of the new production method, that allows to produce separate elements of a tire and then to form them in correspondence with a specific sequence directly on the tire.

EFFECT: the invention presents a development of the new production method, that allows to produce separate elements of a tire with their formation according to a specific sequence directly on the tire.

11 cl, 11 dwg

FIELD: tires production industry.

SUBSTANCE: the invention is pertaining to the tires production industry and may be used at in production of pneumatic tires. The method of removal of a being disassembled toroidal support includes stages of placement of the toroidal support carrying a vulcanized tire on the dismantling workstation. The toroidal support contains allot of sectors located along a circumference around of a geometrical supporting axis and attached to each other with the help of a flange and a counter flange being in a mutual interconnection on opposite to the axis direction concerning the sectors. The method provides for disconnection of the flange from the counter flange, displacement along direction of the axis of the flange and the counter flange at a space from the sectors and removal of each sector from the tire by a centripetal radial translational motion. At that at least to one of the sectors simultaneously with a centripetal radial translational motion impart an angular rotary relocation, which takes place around a pivot axis, that is essentially perpendicular to the direction being radial to the geometrical bearing axis and placed in a meridian plane shifted in a direction of the axis concerning an equatorial plane of the tire. The method ensures extraction of the sectors of the toroidal support from the vulcanized tire directly after removal of the tire from the installation without its deformation and elimination of the high strains formed in the space between sides of the tire.

EFFECT: the invention ensures extraction of the sectors of the toroidal support from the vulcanized tires directly after their removal from the installation and without deformation and a need to eliminate the high tensions formed in the space between the sides of the tires.

10 cl, 11 dwg

FIELD: automatic industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 1.14 to 1.26 mm. Metal cord proper is made of equal-diameter metal threads, ratio of metal thread diameter to diameter of metal cord being from 0.253 to 0.298. Ratio of breaker metal cord pitch to diameter of metal cord is from 1.9 to 2.25, and linear density of metal cord lies within 5.0 and 5.5 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 0.35 to 1.49, breaking strength of metal cord being not lower than 17155N.

EFFECT: reduced materials usage, labour input and energy consumption at production of tyres.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 0.87 to 0.97mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.242 to 0.293. Ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.85 to 2.076, and linear density of metal cord lies within 2.84 and 3.16 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.62 to 1.85, and breaking strength of metal cord is not lower than 9555N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyres.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker consisting of metal cord and textile layers, carcass, side strips and bead rings. Diameter of metal cord is from 0.83 to 0.91 mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.280 to 0.331. ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.978 to 2.168, and linear density of metal cord lies within 2.64 and 2/96 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.538 to 1.839, and breaking strength of metal cord is not lower than 8555N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyre.

2 dwg

FIELD: automotive industry.

SUBSTANCE: proposed pneumatic tire has crown, two side strips and two beads as well as carcass reinforcement secured in each bead and crown reinforcement provided with working unit and protective unit form inside to outside in radial direction. Protective unit contains at least one layer of parallel reinforcement circumferentially orientated elements. Layer of protective unit is formed by reinforcement elements made of aromatic polyamide with initial modulus of elasticity not less than 1000 cN/tex and breaking strength exceeding 65 cN/tex.

EFFECT: increased strength of pneumatic tire crown.

20 cl, 5 dwg

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

FIELD: tire industry.

SUBSTANCE: invention relates to design of automobile tires, particularly to those used in construction vehicles. proposed reinforcement pack N of pneumatic tire contains reinforcement member embedded in converting materials and it includes first layer C1 and second layer C2 of metal elements E1, E2 parallel to each other and embedded into covering materials M1, M2 and third layer C3 of elements E3 made of textile material is placed between two layers C1 and C2, third layer being embedded into covering material M3. Textile elements E3 are orientated relative to elements E1 and E2 at angle within 70° and 110°.

EFFECT: increased strength of tires.

7 cl, 4 dwg

FIELD: tire industry.

SUBSTANCE: invention relates to tire with radial reinforcement of carcass for use on heavy vehicles, such as transport or construction and road-building machines. It relates to tire with axial width exceeding 37 inches. According to invention, tire has working reinforcement crown consisting of at least two uninterrupted working layers and terminating from each side of circumferential (equatorial) middle plane in at least two half-layers whose metal reinforcement members form angles exceeding minimum angle which is formed by reinforcement members of uninterrupted layers relative to circumferential direction. Half-layer passing in axial direction outwards further than other half-layers is in contact with widest in axial direction uninterrupted layer in crown, and two half-layers cover in radial direction axially outer end of said working layer widest in axial direction.

EFFECT: increased service life of tire.

8 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Air tire has breaker structure that comprises first breaker layer (51), second breaker layer (52) arranged in radial-inner position relative to first breaker layer (51), third breaker layer (53) arranged in radial inner position relative to first (51) and second (52) breaker layers. Every breaker layer (51, 52, 53) comprises multiple elongated reinforcing elements arranged above 1st, 2nd and 3rd breaker angles. Note here that 1st and 2nd angles vary from 15 to 40 degrees. Second angle has opposite sign relative to 1st breaker angle. Third breaker angle features magnitude varying from 40 to 90 degrees and opposite sign with respect to second angle. Breaker structure comprises also breaker layer (54) arranged at zero degree angle relative to 1st breaker layer (51) comprising elongated reinforcing elements arranged to make, in fact, zero breaker angle,.

EFFECT: perfected performances.

21 cl, 11 dwg

Tire case // 2422291

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to design of truck radial tires. A case contains tread, breaker consisting of metal-cord and textile layers, casing, sidewalls and bead rings. Metal cord diameter is 0.77-0.85 mm. The metal cord itself is made of metal fibers with equal diameter, and the ratio of metal fiber to metal cord diameter is 0.330-0.410. The ratio of metal cord in rubber-covered breaker layer to metal cord is 2.057-2.743, and linear density of metal cord lays within the range of 2.12-2.34 g/m. Herewith, the thickness of each rubber-covered metal cord layer in breaker is 1.25-1.45 mm, and tensile strength of metal cord is not lower than 8755 N.

EFFECT: material, labor and energy consumption of tire manufacturing is lowered.

2 dwg

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