Tire with aggressive tread with perfected uniformity and wear resistance and method of its protection

FIELD: transport.

SUBSTANCE: machine for production of tire comprises multiple forming wheels suspended above carrier in machine direction. Every forming wheel has multiple recesses to receive preset sections along the tread at tread displacement along every forming wheel. Said recessed have preset depth and shape. Note here that said preset depth increases between forming wheels in machine direction.

EFFECT: better uniformity of the tread adding to tire wear resistance.

7 cl, 1 tbl, 10 dwg

 

AREA of TECHNOLOGY

[0001] the Present invention relates to a tire with an aggressive tread pattern, and method of its manufacture, providing improved uniformity and increased wear.

The LEVEL of TECHNOLOGY

[0002] Tires are mainly produced in large quantities by superimposing different layers on the forming drum buss. The layers may include, for example, the frame and other materials that form the structure of the tire. These layers are wrapped to give a toroidal shape uncured intermediate bus. Then on to the intermediate tyre, add a layer or portion of the tread rubber to create a preform, which is sometimes called "green tire". Then the green tire is vulcanized by application of heat and pressure in the vulcanizing press.

[0003] the wall of the vulcanizing press generally contain forming elements for forming patterns or pattern on the tread of the green tire. These forming elements can be molded, for example, the tread blocks having different shapes and configurations, with one or more grooves dividing the tread blocks from each other. In the tread blocks can also be added various slots or slats.

[0004] In traditional described above, the process of manufacturing tires with aggressive tread designs who can�to ikot trouble associated with a lack of homogeneity. Used in the present application the term "aggressive" refers, in particular, to the structure of the tread, having a deep (along the radial direction) and sometimes large blocks along the tread of the tire. Such structures usually can be used, for example, in a military vehicle and off-road vehicle. In the manufacture of such structures protector large number of tread rubber from the tread of the green tire is pressed into the forming elements, such as cavities or recesses that are shaped tread blocks. Respectively, should be applied significant pressure for moving said tread rubber and molding of the tread elements.

[0005] unfortunately, specified the necessary movement of the protector for the molding of the tread blocks can also cause unwanted displacement of one or more layers of green tires, which are located near the tread. For example, the frame and/or other layers can also be removed, resulting in local effects, such as waves, thickening, waviness or other undesirable irregularity that make the tire inhomogeneous along the peripheral and/or axial directions. Offset tread can lead to deformation of the belt layer. T�Kai heterogeneity may cause unwanted fatigue effect in the tire, for example, expressed in the formation of areas in which there is an undesired temperature rise during operation of the tire, thereby deteriorating the durability of the tire.

[0006] Thus, there is a need in the tire with an aggressive tread pattern, which may be manufactured by the method provides a reduction or elimination of certain inhomogeneities. More specifically, there is a need in the tire, which may be manufactured by way of assisting in the removal of unwanted movement of the various layers of the tire during the molding process. Also there is a need in the tire and method of manufacturing such a tire, according to which it can be improved the wear resistance of the tire.

Disclosure of the INVENTION

[0007] Below will be partially formulated aspects and advantages of the present invention, which will become apparent from the detailed description, or may be achieved by practical implementation of the present invention.

[0008] According to one implementation variant of the present invention proposed a machine for the manufacture of a tire tread having tread blocks defining a machine direction and comprising:

conveying device for conveying the tread in the machine direction; and

many of the forming wheel, suspended over conveying the�device, each of the forming wheel has a plurality of notches for receiving certain areas along the tread when moving tread by each of the forming wheel, wherein the recesses have a predetermined depth and shape and the desired depth of these recesses is increased between the forming wheels along the machine direction, and the notches are arranged to create blocks of the tread having at least one inclined end surface.

[0009] According to another aspect of the present invention a method of manufacturing a tread having tread blocks, comprising the steps according to which:

apply the first pressure to the protector by first forming surface comprising a plurality of recesses, each of which has a depth D1 and each of which has at least one sloping wall for forming an inclined end surface on one of the tread blocks in a predetermined position on the tread, and

apply a second pressure to the protector through the second forming surface comprising a plurality of recesses, each of which has a depth D2 and each of which has at least one sloping wall to continue forming an inclined end surface on one of the tread blocks in a predetermined position on the tread,

moreover �depth D2 is greater than the depth D1.

[0010] These and other features, aspects and advantages of the present invention will become more clear after reading the following description and the attached formula. The accompanying drawings, which are included in the present description and are part of it, show the options of implementing the present invention and together with the description serve to explain the principles of the present invention.

BRIEF description of the DRAWINGS

[0011] a Full and comprehensive view of the present invention, including the preferred variant of its implementation, is intended for specialists, formulated in the description, in which reference is made to the accompanying drawings, in which:

[0012] Fig. 1 shows a perspective view of part of the toroid one of the variants of realization of the intermediate tires made according to the present invention.

[0013] Fig. 2 shows a section along the line 2-2 shown in Fig. 1, unit protector according to the present invention.

[0014] Fig. 3 shows a perspective view of some aspects of the method and device according to the present invention, which can be used for the manufacture of the tread, an embodiment of which is also shown in the manufacturing process.

[0015] Fig. 4 shows a side view of some aspects of a method and apparatus with�line with the present invention, which can be used for the manufacture of the tread, an embodiment of which is shown in the process of wrapping around the intermediate tyres.

[0016] Fig. 5 shows a partial sectional view of the tread blocks, inserted into a mold.

[0017] Fig. 6 shows a side view of some aspects of the method and device according to the present invention, which can be used for the manufacture of the tread, an embodiment of which is also shown in the treatment process.

[0018] Fig. 7 shows a perspective view of the forming wheel, which can be used with the present invention.

[0019] Fig. 8 shows a side view of some aspects of the method and device according to the present invention, which can be used for the manufacture of the tread, an embodiment of which is shown in the process of wrapping around the intermediate tyres.

Fig. 9 shows a partial front view of the example tires according to the present invention.

Fig. 10 shows a partial view in cross section of the example tire of Fig. 9.

[0020] Used identical or similar reference numbers in different drawings designate identical or similar elements.

The IMPLEMENTATION of the INVENTION

[0021] According to the present invention proposed a tire with aggressive features of the protector with the perfect�Anna homogeneity, which allows to increase the wear resistance of the tire. More specifically, according to the present invention proposed a tire made in a way that contributes to the reduction or elimination of some of the irregularities that may occur during the pressing of large tread blocks. Reduction or elimination of these inhomogeneities can improve thermal performance to ensure increased wear resistance of the tire. Hereinafter the present invention will be described by examples of implementation options and/or methods of the present invention, one or more examples of which are shown in the drawings or described using the drawings. Each example is described to explain the present invention and does not limit the present invention. For professionals it is obvious that the present invention can be made various changes and modifications without departure from the scope of protection or the ideas of the present invention. For example, features or steps shown or described as part of a single implementation can be used with other options or implementation stages for more variants of implementation or ways. Thus, the present invention encompasses such changes and modifications of the framework points to the applications�internal formula and cash equivalents.

[0022] Used in the present application, the term "tread rubber" refers to the set of possible composites of both natural and synthetic that can be used for the manufacture of the various parts of the tire.

[0023] the Term "intermediate tire" as used in the present application, relates to the structure of the tyre, which may require additional stages of processing prior to use, such as processing and/or compression in the vulcanizing press.

[0024] Fig. 1 shows a perspective view of part of the toroid exemplary variant of implementation of the intermediate bus 100 according to the present invention. Intermediate tire 100 includes two sidewalls 102 and 104 that are located opposite each other along the axial direction A. the Boards 106 and 108 are located at the end of the sidewalls 102 and 104. Protector 110 extends between the sidewalls 102 and 104. A layer 105 of the frame extends between the flanges 106 and 108 and under the tread 110.

[0025] the Protector 110 contains the pattern created by the arrangement of multiple blocks 112 of the tread located at some distance from each other along the axial direction and A peripheral direction C. the Resulting tread pattern can be considered aggressive because the blocks 112 have a relatively large thickness, measured along the radial direction R (as shown in Fig. 2), and are also consider�till then large in relation to the volume of tread rubber, towering above the surface 114 and forming each block 112. Specific tread pattern shown in the drawing only as an example. The present invention can be used with a variety of other configurations or patterns of the tread blocks. As shown in Fig. 2, the layers 118, 120, 122 and 124 of block 112 are essentially the same thickness T. However, using the provisions described in this application, should take into account that possible changes of the thickness T between the layers.

[0026] As shown in Fig. 1 and 2, each block 112 of the tread contains a number of layers 118, 120, 122 and 124 of the tread rubber. The first layer 118 located on the base 116, which extends along the peripheral direction C between the sidewalls 102 and 104. Despite the fact that the drawing shows only four layers, in accordance with the provisions of the present application means that the execution of a block of the tread according to the present invention can be used more or fewer layers, and options for implementation, shown in the drawings are examples only. As shown in the drawing, the layers 118, 120, 122 and 124 are located along the radial direction R and sequentially decrease in size toward the outside (in the upper direction, as shown in Fig. 2) along the radial direction R. for Example, the width of the layer 120, as measured along an axial �of UPRAVLENIE, is less than the specified width for the layer 118, and so on for other layers 122 and 124.

[0027] According to another implementation variant, the layers 118, 120, 122 and 124 are reduced in size along the radial outward direction R, so that the layers are staggered, as shown in Fig. 2. As a result, each layer has an end surface that surrounds the main surface. More specifically, the first layer 118 has an end surface 136 that surrounds the main surface 128; the second layer 120 has an end surface 138 that surrounds the main surface 130; a third layer 122 has an end surface 140 that surrounds the main surface 132; and the fourth layer 124 has an end surface 142 that surrounds the main surface 134. The area of each end surface is reduced between successive end surfaces along a radial outward direction. For example, the area of the end surface 138 is smaller than the area of the end surface 136.

[0028] Fig. 3 shows a perspective view of some aspects of the method and device according to the present invention, which can be used for the manufacture of the tread 110. As shown in the drawing, the tread rubber sheet 200 is served in a machine direction M to overlay layers that form a unit 112 of the tread. Cutting the�ful, such as water jet cutting nozzle 146, 148 feeds the flow of water under high pressure in the direction to the sheet 200. Coordinate mechanism (not shown) or other control device moves the cutting nozzle 146 for cutting out from a sheet of 200 individual parts, each of which forms one of the layers 118, 120, 122 or 124, making the block 112 of the tread. When you move the sheet 200 along the machine direction M automated shoulder 143 with suction Cup 144 or other selecting device individually selects the parts that make up the layers 118, 120, 122 or 124, and sequentially places each layer on the base 116 (as shown by the arrows V and R and the dotted image of the shoulder 143). The controller (not shown) controls the automatic shoulder 143 for placing each layer in a predetermined position on the base 116 and the stacking of the layers (layers a smaller size on top of layers of larger size) to create a tread block 112. In this example method, the base 116 is also moved along the machine direction M parallel to the movement of the sheet 200.

[0029] As shown in Fig. 4, after formation of each block 112, the protector 110 is moved along the machine direction M, for example, by means of a conveying device 155 that contains an endless conveyor belt 176, which carry the rollers 180. Protector 110 (including DOS�of blocks 116 and 112) is fed to a raw intermediate bus 184 and wrap around the intermediate bus 184, as shown by the arrow C in Fig. 4. Then the resultant intermediate bus 110, for example, can be served in a vulcanization press for the application thereto of heat and pressure.

[0030] it is Assumed that after this treatment, the step structure of the individual layers 118, 120, 122 and 124, as shown in Fig. 1-4, becomes obvious. Fig. 5 shows a section of a hole or cavity 202 that is bounded by a wall 204 of the mold 206, which may be part of a vulcanizing press. As the tread block 112 communicates with the mold 206 (as shown by the arrow P), the layers 118, 120, 122 and 124 initially come into contact with the wall 204 only tangentially at points in the intersection of the end surface and the main surface of these layers. Under the action of applied the mold to heat and pressure, the layers 118, 120, 122 and 124 takes the form of a wall of the mold 204. In addition, the first layer 118 contains additional tread rubber, which contributes to the filling of cavities 208. If the precise dosage of the amount of each of the layers 118, 120, 122 and 124, the volume of tread rubber, a component of the finished vulcanized tread block 112, in essence, is equal to the total volume of the tread rubber contained in the layers 118, 120, 122 and 124. As a result, additional tread rubber fills the cavity 208 without increasing the base 116 that could cause paulinenstrasse, such as, for example, the local offset of the frame 105 (as shown in Fig. 1) and/or breakers, passing radially outside the carcass in the crown area. Instead, in essence, the whole tread rubber contained in the layers 118, 120, 122 and 124 to eliminate the local effects that lead to inhomogeneities.

[0031] Fig. 6 shows a perspective view of some aspects of the method and molding device 210 according to the present invention, which can be used for the manufacture of uncured tread 212, which is shown in the process. The device 210 includes conveying device 158 for transportation unshaped protector 156 along machine direction M. the Conveying device 158 includes an endless conveyor belt 160, which carry the rollers 162, and return the tape 160, which moves in the direction B. the Number of the forming wheels 150, 152 and 154 are suspended over handling device 156. More specifically, each of the first forming wheel 150, the second forming wheel 152 and forming a third wheel 154 suspended over handling device 155 in the heights, each of which is smaller than the total thickness T unshaped protector 156. When you move unshaped protector 156 in machine direction m of each of the forming wheel presets�, as shown by the arrows R, and protector 156 is compressed between the forming wheels 150, 152, 154 and conveying device 158.

[0032] the First forming wheel 150 includes a number of notches 166, made in the first forming surface 192. Similarly, the second forming wheel 152 includes a number of recesses 168 formed in the second forming surface 194. Third forming wheel 154 has a series of notches 170, made in the third forming surface 196. Fig. 7 shows an enlarged perspective view of the third forming wheel 154. Third forming wheel 154 includes a number of notches 170 along the peripheral direction C and the axial direction A, for molding protector 156. Each recess 170 has a sloping wall 188 for molding unvulcanized tread 156. Each recess 170 has a specific form and set position designed to create a tread and give concrete form to the blocks in the tread 156. The configuration shown in Fig. 7 is only an example, and can also be used in other configurations.

[0033] As shown in Fig. 6, the notches of each of the forming wheels 150, 152, 154 have a predetermined depth, which increases from wheel to wheel along the machine direction M. for Example, the first forming wheel 150 has a recess 166 with depth D1, and the inclined surfaces 198. P�such a way as the second forming wheel 152 includes recesses 168, having a depth D2, and the third forming wheel 154 has a recess with a depth D3. The depth increases along the machine direction such that D3>D2 and D2>D1.

[0034] Accordingly, when moving uncured tread 156 in machine direction M by means of a conveying device 158 of the first forming surface 192 is applied to protector 156 first, the pressure created by the intermediate unit 169 of the tread, i.e. the workpiece in the form of end of unit 172 of the tread. With further movement of part 156 in machine direction m of the second forming surface 194 applies a second pressure to the block 169 tread to create the intermediate unit 171 of the tread. Finally, when you move part 156 under a third of the forming wheel 154 third forming surface 196 applies a third of the forming pressure to the protector 156 to create a block 172 protector of the intermediate unit 171 of the tread. Block 172 protector has an inclined end surface 174 and an end part of the tread 212.

[0035] Successively forming each surface 192, 194 and 196 squeezes extra tread rubber from part 156 in the recess for molding block 172 protector. Forming surface 192, 194 and 196 are consistent with the approach to transporting �poverhnosti carrying unit 190 158, or sequential decrease of wheels 150, 152 and 154 relative to each other, or with the increase of the diameter of the wheels from wheel to wheel along the machine direction M. the Relative position of the recesses on each of the forming wheels 150, 152 and 154 is the same for all wheels, and the speed R of rotation of the wheels is synchronized to the proper location of the applied forming pressure from wheel to wheel when creating tread blocks.

[0036] As shown in Fig. 8, after forming each block 172 protector 212 is moved in machine direction M, for example, by means of a conveying device 159, containing endless belt 178, which is supported by the rollers 182. Protector 212 serves on raw intermediate bus 186 and wrap around the intermediate bus 186, as shown by the arrow C in Fig. 8. Then the resultant intermediate bus 186 may be, for example, placed in a vulcanizing press for the application thereto of heat and pressure. In addition, because the blocks 172 protector were formed wholly or partly before the additional compression and processing in the vulcanizing press, rubber to create blocks 172 protector is already present and need not be specified extraction of rubber from the base 214 by the application of heat and pressure. Again, the design and method of STRs�obstat to reduce or eliminate discontinuities, which can occur if the intermediate layers of the tire 186 passing radially inside the base 214 are shifted or moved during the extraction of rubber from the base 214.

[0037] Fig. 9 shows another example of the tire 300, containing aggressive tread blocks 302. The cut of the tire 300 is shown in Fig. 10. The tire 300 comprises a frame 304, the first layer 304 of the cord, a second layer 308 of the cord and the third layer 310 of the cord. Table 1 presents the results of the evaluation differences of temperatures that can be achieved if the features of the protector, such as aggressive blocks 302 of the tread created by traditional molding and vulcanization of the tire, compared with the creation of the specified features to the traditional stage of vulcanization.

TABLE 1
PositionTemperature, °C, in the conventional molding tiresTemperature, °C, the molding blocks to vulcanizationΔ°C
T1117,5108,5-9,25
T211798,25-18,75
T3107,2596,75-10,5
T4991001

[0038] Each row represents the temperature measured at various locations T1, T2, T3and T4crown, made in the traditional way bus 300 compared to the bus 300, containing aggressive tread blocks created before the vulcanization of the tire. As shown in Table 1, in some locations can be achieved a significant reduction in temperature. The reduction can significantly improve the wear resistance of the tire. In addition, data suggests that a significant temperature improvements are likely to be achieved in the area of the lateral edges of the layers 304, 308 and 310 of the cord, the specified edge fabric layer can be more easily shifted during the traditional process of pressing, because rubber located above (radially outer side) of the fabric layer has a tendency to shift in the mold cavity.

[0039] despite the fact that the present invention is described in detail by way of examples to the ways of its implementation, specialists after reviewing the above described�eat can easily make changes modifications and substitutions to the described variants of implementation. Accordingly, the description of the present invention described in this application only as an example and not a limitation, and does not preclude such changes, modifications and/or additions in the present invention, which are obvious to those skilled in the art.

1. Machine for the manufacture of a tire tread having tread blocks defining a machine direction and comprising:
conveying device for conveying the tread in the machine direction; and
many of the forming wheel, suspended over the handling device in series along the machine direction, each of the forming wheel has a plurality of notches for receiving certain areas along the tread when moving tread by each of the forming wheel, wherein the recesses have a predetermined depth and shape and the desired depth of these recesses is increased between the forming wheels along the machine direction, and the notches are arranged to create blocks of the tread having at least one inclined end surface.

2. Machine for the manufacture of a tire tread having tread blocks according to claim 1, in which each of the recesses has at least one sloping wall to set at least one inclined end surface of the tread blocks.

3. Machine for the manufacture of a tire tread having tread blocks according to claim 2, which has a machine direction, and referred to the forming wheels arranged in series along the machine direction.

4. Machine for the manufacture of a tire tread having tread blocks according to claim 3 in which forming these wheels are suspended above the transport surface of the transporting device and at altitudes that are less than the total thickness of the tread.

5. A method of manufacturing a tread having tread blocks, comprising the steps according to which:
apply the first pressure to the protector by first forming surface comprising a plurality of recesses, each of which has a depth D1 and each of which has at least one sloping wall for forming an inclined end surface on one of the tread blocks in a predetermined position on the tread, and
apply a second pressure to the protector through the second forming surface comprising a plurality of recesses, each of which has a depth D2 and each of which has at least one sloping wall to continue forming an inclined end surface on one of the tread blocks in a predetermined position on the tread,
moreover, the depth D2 is greater than the depth D1, and the specified stage of the application of the second galleriavieraat in position below along the conveyor along a machine direction relative to the location, in which perform the first step in the application of pressure.

6. A method of manufacturing a tread having tread blocks according to claim 5, further comprising steps according to which:
apply a third pressure to the protector through the third forming surface comprising a plurality of recesses, each of which has a depth D3 and each of which has at least one sloping wall to continue forming an inclined end surface on one of the tread blocks in a predetermined position on the tread,
moreover, the depth D3 is greater than the depth D2.

7. A method of manufacturing a tread having tread blocks according to claim 6, further comprising stages, according to which move the protector by first and second forming surfaces during this step in the application of the first pressure and the specified stage of the application of the second pressure.



 

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Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Proposed tire comprises sets of blocks G composed of polygonal blocks 10 arranged tightly in crown zone 1. Polygonal blocks 10 are confined by grooves 9 including first grooves 9a of W9a width and arranged between polygonal blocks 10 adjoining in tore circular direction. Width W9a of first grooves 9a is larger than width W9b of second grooves 9b located between polygonal blocks 10, adjoining and staggered.

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

FIELD: transport.

SUBSTANCE: invention relates to design of slits in tire tread pattern. Treat layer has treat patter forming annular grooves and crosswise grooves while tread blocks 22 with slits are formed. At least some of said slits 27 in lengthwise direction feature wavy configuration. This allows making at least two main surfaces (272A, 272B) in said slit 27 arranged in line and shifted one relative to the other through preset distance C. Transition zone 272C is located between said main surfaces. Adjacent main surface 272A, 272B incorporated locking elements 28 made up of ledge 281 in one of walls of slit 27 and shaped to truncated cone while opposite wall 271 of said slit has recesses 282 of the same shape. Ledge 281 and recess 282 conjugate when walls 281 of aforesaid slit get pressed together. Invention covers appropriate tire tread and to means used in production of the tire.

EFFECT: improved grip.

9 cl, 11 dwg

Pneumatic tire // 2473430

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Group GB of small blocks is arranged on, at least, a section of tire running surface 1. Group of small blocks comprises multiple small blocks 3 located side by side. Said group comprises, at least, one lengthwise main groove designed by position 4 including through section of said groove extending linearly along running surface and, at least, one ribbed lateral section 6 adjoining lengthwise main groove to make side surface 5 of said groove extending continuously in longitudinal direction. Density D of small blocks varies from 0.003 to 0.04 pc/mm2 to express amount of said block per actual area of contact spot.

EFFECT: better water removal, ruled out irregular wear, better running on ice and snow.

4 cl, 7 dwg, 2 tbl

Pneumatic tire // 2472630

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire 1 comprises tread 2 with central section L1 located on both sides of equatorial plane 7, and sections 8, 12 in two shoulders. Central section L1 is separated from parts 8, 12 in shoulders by two circular grooves 3, 6, and has, at least, one circular rib 9 arranged between first and second grooves 3, 4. Tread 2 features void factor smaller than 0.28. Rib 9 comprises transverse grooves 16 extending on distance making, at least, 50% of tread width. Note here that said transverse grooves 16 comprises, at least, one curvilinear section. Note also that said grooves 16 have width smaller than that of circular grooves 3, 4, while, at least, one of circular grooves that makes circular rib, has, at least, one lateral wall that makes wavy profile.

EFFECT: better bite.

28 cl, 7 dwg, 1 tbl

Pneumatic tire // 2471639

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of motor tire. Pneumatic tire includes tread (2) with central longitudinal groove (3a), shoulder longitudinal grooves (3b) passing at both sides of central longitudinal groove (3a) and intermediate areas (4a) of ground coupling separated by central longitudinal groove (3a) shoulder longitudinal grooves (3b). Each of areas (4a) of ground coupling includes narrow grooves (5) passing from position spaced to inner side in axial direction of tire from shoulder longitudinal groove (3b); intermediate tilted grooves (6) each one of which goes tilted from narrow groove (5) towards central longitudinal groove (3a) and terminates without connection with central longitudinal groove (3a), and connecting grooves (7), interconnecting intermediate tilted grooves (7) adjacent in longitudinal direction of tire. Connecting grooves (7) are tilted relative to tire longitudinal direction in the same direction as intermediate tilted grooves (6) and at less angle than intermediate tilted grooves (6).

EFFECT: better drainage and antinoise characteristics of tire.

5 cl, 8 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: at maximum height of tire tread pattern, circumferential grooves (1, 2), tilted grooves (9), and transversal grooves (7, 8, 10, 14, 14a, 18) are made, which delimit checkers (4, 6, 12, 15, 17a, 17b) of tread pattern and are respectively provided with multiple slots (19, 20, 21, 22), oriented essentially in transversal direction of tread pattern. Transversal grooves (7, 8, 10, 14, 14a, 18) along their length have less depth than circumferential grooves (1, 2).

EFFECT: better dynamic properties of tire on winter roads without lowering tread rigidity and thus without deterioration of dynamic properties on dry roadway.

7 cl, 4 dwg

Tire for damp road // 2461465

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Tire 1 comprises tread 2 with pattern 3 including first and second pattern extending along tire circle to make module 5 with smaller pattern spacing and module 8 with larger pattern spacing. Note here that all modules comprise first groove 15 with initial section 32 and section 34 with larger cross-section, both sections extending from outer axial first end 30 toward opposite axial second end 31. Note here that section 34 is dead section on, at least, it iner axial side in zone of contact spot. Initial section and that with larger cross-section have first width W1 and second width W2, respectively, and feature module 5 W2-to-W1 ratio exceeding that of module 8.

EFFECT: higher tire rod grip.

36 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of branch pipes from rubber cord to be operated at pressure in oil-and-gasoline resistant fluids at increased working temperature of 150°C. In compliance with this method, rubber cord blank plies are made and cut out, grouped and cured. Simultaneously, groove is made in heat-and-oil resistant rubber ply over the entire length of the drum to fit a cord thread in said groove at a proper tension with the help of appropriate brake. Said cord thread is embedded in said heat-and-oil resistant rubber ply by more than half the cord thread thickness. Plies of temporary polyethylene film ply is applied thereon and glued thereto and removed after gluing rubberised cord fabric to said rubber cord branch pipe.

EFFECT: higher strength of bond between cord thread and sealing and cover plies of said heat-and-oil resistant rubber ply.

4 dwg

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