WO2013014919A1 - 空気入りタイヤおよび、空気入りタイヤの製造方法 - Google Patents
空気入りタイヤおよび、空気入りタイヤの製造方法 Download PDFInfo
- Publication number
- WO2013014919A1 WO2013014919A1 PCT/JP2012/004689 JP2012004689W WO2013014919A1 WO 2013014919 A1 WO2013014919 A1 WO 2013014919A1 JP 2012004689 W JP2012004689 W JP 2012004689W WO 2013014919 A1 WO2013014919 A1 WO 2013014919A1
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- WO
- WIPO (PCT)
- Prior art keywords
- bead core
- organic fiber
- tire
- bead
- carcass ply
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
- B29D30/50—Covering, e.g. by winding, the separate bead-rings or bead-cores with textile material, e.g. with flipper strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
- B60C2015/044—Bead cores characterised by a wrapping layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10819—Characterized by the structure of the bead portion of the tire
Definitions
- the present invention includes at least one sheet having a pair of annular bead cores embedded in a bead part, a main body part extending in a toroidal manner between the pair of bead cores, and a folded part continuously folded around the bead core. And a tread rubber disposed on the outer peripheral side of the crown area of the carcass ply, and the cross-sectional shape of the bead core in the tire width direction is arranged at one or more corners on the main body side of the carcass ply.
- the present invention relates to a pneumatic tire having a polygonal portion, particularly a pneumatic tire suitable for use as a heavy duty tire for trucks and buses, and a method for manufacturing a pneumatic tire, and particularly, according to a corner portion of a bead core. , Proposes a technology to prevent the decline of carcass ply durability by suppressing stress concentration on the carcass ply Than is.
- the carcass ply functions to prevent the carcass ply from being pulled out from the bead due to the action such as the internal pressure of the tire and the load applied to the tire.
- a bead core in general, one or a plurality of cords made of steel or the like are wound in the tire width direction so as to have a predetermined number of rows and steps in the tire width direction cross section, and in the tire radial direction.
- a cross-sectional shape in the tire width direction, which is formed by winding, is a polygon having one or more corners on the main body side of the carcass ply, for example, a hexagon.
- the carcass ply main body portion becomes the bead core each time a tensile force in the direction of pulling out from the bead portion acts on the carcass ply when the tire rolls.
- the tire is used under conditions of unexpectedly high internal pressure and high load, it is repeatedly pressed against the corner on the main body side.
- the increase of the pressing force causes a concentration of stress on the carcass ply, resulting in a problem that the durability of the carcass ply is lowered.
- Patent Document 1 discloses that one layer of an organic fiber cord layer formed by inclining and winding an organic fiber cord in a uniform orientation around a bead core with an inclination to the tire circumferential direction is combined with the bead core and the carcass.
- a pneumatic tire interposed between the ply is described, and according to this, the distance between the main body portion of the carcass ply and the corner portion of the bead core is the organic fiber cord of the organic fiber cord layer, and Since it is ensured by its coating rubber, the stress concentration on the carcass ply pressed against the corner of the bead core, as described above, during the rolling load of the tire, the stress between them, in particular, the coating rubber It is considered that the decrease in durability of the carcass ply can be suppressed to some extent by relaxing with the thickness.
- a ribbon in which the organic fiber cord is embedded around the bead core material in manufacturing the pneumatic tire described in Patent Document 1, in forming the material of the organic fiber cord layer around the bead core material, a ribbon in which the organic fiber cord is embedded around the bead core material.
- the strip-shaped strip can be wound by spirally winding in the circumferential direction of the bead core material.
- the surface of the organic fiber cord layer material to be formed due to the overlap of the strips of the ribbon-like strip that are wound adjacent to each other in the circumferential direction of the bead core material, in particular the inner cords extending in parallel.
- the strip 100 spirals without overlapping the strip portions 100a and 100b adjacent in the circumferential direction. It is necessary to wind in a shape.
- the object of the present invention is to solve such problems of the prior art, and the object of the invention is to effectively reduce stress concentration on the carcass ply pressed by the corners of the bead core. Then, it is providing the manufacturing method of the pneumatic tire which can fully prevent the fall of durability of a carcass ply, and a pneumatic tire.
- a pneumatic tire according to the present invention includes a pair of annular bead cores embedded in a bead part, a main body part extending in a toroidal manner between the pair of bead cores, and a folded part continuously folded around the bead core.
- a carcass made of at least one carcass ply and a tread rubber disposed on the outer peripheral side of the crown area of the carcass, and the cross-sectional shape of the bead core in the tire width direction is aligned with the main body side of the carcass ply.
- a pneumatic tire having a polygonal shape with more than one corner, wherein one or a plurality of organic fiber cords covered with rubber are inclined with respect to the center line of the cross section of the bead core around the bead core.
- An organic fiber reinforcing layer formed by spirally winding is provided by laminating at least two layers.
- Each organic fiber cord of the fiber reinforcement layer extends in a direction crossing each other with respect to the cross-sectional center line of the bead core, and among the organic fiber reinforcement layers adjacent to the inside and outside, the organic fiber reinforcement layer on the inner layer side is:
- the rubber-coated organic fiber cord is wound with at least a portion provided in the tire circumferential direction without overlapping in the tire circumferential direction, and the organic fiber reinforcing layer on the outer layer side covers at least a part of the gap.
- the “cross-sectional center line of the bead core” refers to an annular line extending in the circumferential direction of the bead core through the center of the cross-section of the bead core in the tire width direction.
- the distance in the tire width direction between the body portion of the carcass ply and the corner portion of the bead core on the side of the body portion is 2 mm or more and 3 mm or less in a posture that is assembled to the adaptive rim and filled with the specified internal pressure.
- the “adaptive rim” here refers to a rim defined in the following standard according to the tire size
- the “specified internal pressure” refers to the air pressure defined in accordance with the maximum load capacity in the following standard.
- Maximum load capacity means the maximum mass allowed to be loaded on a tire according to the following standards. The standard is determined by an industrial standard effective in the region where tires are produced or used. For example, in the United States, “THE TIRE AND RIM ASSOCIATION INC.
- the bead core is formed by winding one or a plurality of steel cords in a plurality of rows in the tire width direction and in a plurality of stages in the tire radial direction
- the carcass ply referred to here is used.
- the distance between the main body portion and the bead core corner portion means the shortest distance in the tire width direction between the surface of the cord located at the corner portion of the bead core on the main body portion side and the surface of the ply cord of the carcass ply.
- the ratio of the length in the tire radial direction and the length in the tire width direction of the bead core in the tire width direction cross section is 1: 0.8 to 1.2.
- an organic fiber cord is unvulcanized around the bead core material when forming the organic fiber reinforcing layer material of two or more layers around the annular bead core material.
- the ribbon-like strip formed by covering the rubber extends while being inclined with respect to the center line of the cross-section of the bead core material, and the ribbon-like strip is overlapped with the strip portions adjacent to each other in the circumferential direction of the bead core material.
- the inner layer side reinforcing layer material is formed by spirally winding the ribbon, and then a ribbon-like strip is formed around the inner layer side reinforcing layer material, and the strip portions of the inner layer side reinforcing layer material are mutually connected.
- the outer layer side reinforcing layer material is formed by spirally winding in the direction intersecting the strip extending direction of the inner layer side reinforcing layer material on the outer peripheral side of the gap formed therebetween.
- the organic fiber reinforcement layers are provided around the bead core, and the organic fiber cords of the organic fiber reinforcement layers adjacent to the inside and outside are arranged at the center of the cross section of the bead core.
- the entire circumference of the bead core is covered with two or more layers of organic fiber reinforcing layers having a large layer thickness.
- the organic fiber reinforcement layer on the inner layer side is provided with a gap in the tire circumferential direction at least partially without the rubber-coated organic fiber cords overlapping in the tire circumferential direction.
- the organic fiber cords included on the inner layer side of the organic fiber reinforcing layer can be prevented from overlapping, and a large force can be prevented from being locally applied from the bead core to the carcass ply.
- the thickness of a rubber layer is securable over the whole surrounding surface of a bead core by providing the organic fiber reinforcement layer by the side of an outer layer so that at least one part of the said clearance gap may be covered.
- the required thickness of the organic fiber reinforcing layer between the bead core and the carcass ply is Securing and effectively relieving stress concentration on the carcass ply while effectively demonstrating the function of mooring the carcass ply of the bead core, preventing the carcass ply from being pulled out from the bead, It is possible to prevent thermal deterioration of the rubber due to an increase in the amount of heat generated at the bead portion.
- the distance between the carcass ply main body and the bead core corner is less than 2 mm, the distance from the bead core corner of the carcass ply main body is small, thereby sufficiently reducing stress concentration on the carcass ply.
- the distance exceeds 3 mm there is a concern that the anchoring force of the carcass ply due to the bead core may decrease, and the increase in rubber volume may cause There is also a risk of increasing the amount of heat generation.
- the ratio of the length in the tire radial direction to the length in the tire width direction of the bead core is 1: 0.8 to 1.2, for example, a hexagonal bead core is formed in the tire width direction cross section.
- the corners of the bead core on the carcass ply main body side have a larger opening angle, so the carcass pressed against these corners during tire rolling The stress concentration on the ply can be further reduced, and the durability reduction of the carcass ply can be more effectively prevented.
- the reinforcing layer material when the ribbon-like strip is spirally wound around the bead core material to form one layer of the organic fiber reinforcing layer material, the reinforcing layer material
- the gap formed between the strip portions adjacent to each other in the circumferential direction of the bead core material can be sufficiently covered with the reinforcing layer material formed on the outer layer side.
- the circumferential surface of the bead core is covered with a sufficiently thick rubber thickness by the two or more organic fiber reinforcing layers formed around the bead core.
- a tire that can effectively reduce stress concentration on the tire can be manufactured.
- the ribbon-shaped strip is wound in a direction intersecting the strip extending direction of the inner layer side reinforcing layer material, so that the inner and outer layer reinforcing layer materials are wound. Since the organic fiber cords embedded in each other do not overlap in parallel, it is possible to prevent the deterioration of the surface properties of the reinforcing layer material due to such parallel overlap of the cords. It is possible to prevent an unintended uneven shape from being generated on the surface of the carcass ply due to the overlapping portion of the organic fiber cord being pressed against the carcass ply.
- FIG. 1 is a cross-sectional view in the width direction showing one embodiment of a pneumatic tire according to the present invention with respect to a tire half portion.
- FIG. 2 is a cross-sectional view in the width direction showing an enlarged main part of the tire of FIG. 1. It is a figure which shows typically the carcass line in a bead part. It is a side view of the bead core material which wound the strip which shows a part of manufacturing process of the tire of FIG. It is the elements on larger scale of the bead core material which wound the strip which shows the winding mode of the 2nd layer strip to bead core material. It is width direction sectional drawing which shows each bead core arrange
- a pneumatic tire 1 illustrated in FIG. 1 includes a pair of annular bead cores 3 embedded in a bead part 2, a main body part 4a extending in a toroidal manner between the pair of bead cores 3, and a main body part 4a.
- a carcass ply 4 having a folded portion 4 b that is folded back from the inner side in the tire width direction and an outer peripheral side of the crown region of the carcass ply 4, for example, from two belt layers And a tread rubber 6 disposed on the outer peripheral side of the belt 5.
- the bead core 3 is formed of one or a plurality of steel cords, for example, as shown in an enlarged sectional view in FIG. Can be formed in a plurality of rows in the tire width direction and in a plurality of stages in the tire radial direction.
- each of the two layers of the organic fiber reinforcing layers 7 and 8 has one or a plurality of organic fiber cords coated with rubber around the bead core 3 with respect to the center line C of the cross section of the bead core.
- the organic fiber cords of the organic fiber reinforcing layers 7 and 8 extend in a direction intersecting with the center line C of the cross section of the bead core 3.
- the two-layer organic fiber reinforcement covering the entire peripheral surface of the bead core 3 is provided.
- the layers 7 and 8 ensure a sufficient distance D between the corner portion 3a of the bead core 3 and the carcass ply main body portion 4a, and particularly the two layers of the organic fiber reinforcing layers 7 and 8, Since the covering rubber portion existing over the entire peripheral surface of the bead core 3 functions to effectively relieve the pressing force to the bead core corner portion 3a that repeatedly acts on the carcass ply main body portion 4a, the carcass by the bead core corner portion 3a. The stress concentration on the ply main body 4a is sufficiently reduced, and the possibility of the durability of the carcass ply 4 being lowered can be surely removed.
- the material of the organic fiber cords of the organic fiber reinforcing layers 7 and 8 can be, for example, nylon, rayon, polyester, aromatic polyamide, or the like.
- the function of reducing stress concentration on the carcass ply 4 due to the organic fiber reinforcing layers 7 and 8 is provided.
- the main body 4a of the carcass ply 4 and the carcass ply 4 from the viewpoint of preventing the carcass ply 4 from being pulled out from the bead part 2 and suppressing an increase in the amount of heat generated in the bead part 2.
- the distance D in the tire width direction between the bead core 3 and the corner 3a on the main body 4a side is preferably 2 mm or more and 3 mm or less.
- the illustrated bead core 3 having a hexagonal cross-sectional shape in the tire width direction has a ratio of the length in the tire width direction to the length in the tire radial direction in the tire width direction cross section of 0.8 to 1.2. It is preferable to be within the range. In this case, as schematically shown in FIG.
- the opening angle of the corner portion 3a of the bead core 3 on the carcass ply main body portion 4a side that is, the inner angle ⁇ at the corner portion 3a of the bead core 3 having a hexagonal shape, It becomes larger than the conventional one shown by the phantom line in the figure, and it can further reduce the stress concentration on the carcass ply main body 4a pressed by the corner 3a, and from the center position of the cross section in the tire width direction of the bead core 3.
- the carcass ply 4 Since the rising angle ⁇ on the acute angle side of the carcass line of the carcass ply main body portion 4a existing on the outer side in the tire radial direction with respect to the tire width direction is larger than the conventional one, the carcass ply 4 is indicated by an arrow in the figure. Due to the action of the tensile force T in the direction, the pressure reaction force F received by the carcass ply main body portion 4a from the bead core corner portion 3a can be reduced. It is possible to more effectively prevent a decrease in the durability of A-4.
- the rising angle ⁇ of the carcass line can be set within a range of 60 ° to 70 °, for example.
- the bead core 3 is located at the innermost side in the tire width direction in the illustrated tire width direction cross section in a no-load state filled with the specified internal pressure.
- the center of the innermost cord in the width direction that is positioned and the center of the cord that is the innermost in the tire width direction among the cords that form the radially outer surface of the bead core 3 are connected by a straight line.
- Each of the two straight lines that pass through each of the two parallel lines in the tire width direction is drawn, and the straight line connecting the two intersections of each of the two straight lines and the carcass ply main body portion 4a with respect to the tire width direction. This can be done by measuring the angle on the acute angle side.
- the cross-sectional shape of the bead core 3 in the tire width direction is a hexagon, but this cross-sectional shape is a polygon having one or more corners on the main body 4a side of the carcass ply 4, for example, Although omitted, it may be a square or the like.
- one carcass ply 4 can be formed by extending a steel cord, an organic fiber cord or the like in the radial direction, and although not shown, two or more carcass plies can be provided.
- the belt 5 is constituted by, for example, a two-layer belt layer in which a steel cord or the like is inclined and extended at an angle within a range of 20 ° to 60 ° with respect to the tire equatorial plane.
- the respective cords of these belt layers extend in opposite directions with respect to the tread circumferential direction.
- FIG. 1 In manufacturing such a pneumatic tire, for example, in order to form two or more organic fiber reinforcing layer materials around an annular bead core material formed by winding a rubber-coated steel cord, first, FIG. As shown in (a), a ribbon-shaped strip 21 formed by coating an organic fiber cord with unvulcanized rubber is inclined around the bead core material 20 with respect to the center line of the cross section of the bead core material 20 in a spiral shape. The ribbon-shaped strip 21 is wound by one turn in the extending direction of the center line of the cross-section of the bead core material 20 to form the first-layer (inner layer side) organic fiber reinforcing layer 22.
- the strip portions 21a and 21b adjacent to each other in the circumferential direction of the annular bead core material 20 of the strip 21 are overlapped with each other and wound, the strip portions 21a and 21b are overlapped with each other.
- the organic fiber cords inside the portions 21a and 21b may overlap with each other in a posture extending in parallel with each other, and this overlap of the organic fiber cords around the bead core material 20 is the surface property of the reinforcing layer material 22.
- adjacent strip portions 21a and 21b are not overlapped with each other and are wound with at least a gap S between adjacent strip portions.
- the interval I 1O on the outer side in the tire radial direction is set, for example, within a range of 0 mm ⁇ I 1O ⁇ 11 mm. And preferably, the interval I 1I on the inner side in the tire radial direction is in the range of 0 mm ⁇ I 1I ⁇ 10 mm. Thereby, it can prevent that the organic fiber cord contained in the inner layer side of an organic fiber reinforcement layer overlaps, and can prevent that big force is locally added to a carcass ply from a bead core.
- the strips are wound without overlapping the adjacent strip portions, and the cords of the respective reinforcing layer materials are parallel to each other.
- the surface texture of the outermost reinforcing layer material can be made adequately appropriate, so that the surface texture of the outermost reinforcing layer material is arranged around the carcass. The influence on the ply material and the like can be sufficiently reduced.
- the average value of the intervals in the gaps on the entire circumference in the tire circumferential direction is used.
- a ribbon-shaped strip 23 is spirally wound around the first-layer reinforcing layer material 22 to form a second-layer reinforcing layer material 24.
- the strip portions 21a and 21b adjacent to each other in the circumferential direction of the annular bead core material 20 were wound without overlapping each other in the formation of the first layer described above.
- the strip 23 is extended on the outer peripheral side of the gap S of the first reinforcing layer material 22 so as to cover the gap S generated between them as much as possible, preferably completely. Thereby, the thickness of a rubber layer is securable over the whole peripheral surface of a bead core.
- the strip 23 forming the second layer is shown in an enlarged plan view in FIG. As shown, it is wound in a direction crossing the extending direction of the first strip 21.
- the second reinforcing layer material 24 it is possible to provide the reinforcing layer by winding the ribbon-shaped strip 23 with an interval I 2I on the inner side in the tire radial direction within a range of 0 mm ⁇ I 2I ⁇ 10 mm, for example. This is preferable in that the organic fiber cords are prevented from overlapping in a layer close to the carcass ply of the material and a large force is locally applied from the bead core to the carcass ply.
- the outer layer strip is extended on the outer peripheral side between the inner layer strip portions, and the inner layer strip is extended. It can be carried out by crossing in the direction and preferably winding with intervals I 2O and I 2I .
- the ribbon-like strips 21 and 23 used for forming the reinforcing layer materials 22 and 24 those having a strip width of about 20 to 30 mm and a strip thickness of about 1 mm can be used.
- One or a plurality of aligned organic fiber cords are dipped and then sandwiched between two thin unvulcanized rubber sheets fed from the upper and lower sides to coat the cords with rubber Can be formed.
- the cross-sectional center line C1 of the bead core material 20 is sandwiched among the intersecting angles formed by the extending direction of the inner layer side strip 21 and the extending direction of the outer peripheral side strip 23.
- the crossing angle ⁇ on the side is set to 70 ° to 130 °, so that parallel overlap of the respective cords of the inner and outer layers can be prevented more reliably, and the strip can be easily wound around the bead core material 20. It is preferable at the point which can do.
- the outer layer side reinforcing layer material 24 when the outer layer side reinforcing layer material 24 is formed, when the strip 23 different from the inner layer side reinforcing layer material 22 is used, the outer layer side strip 23 is arranged in the circumferential direction of the annular bead core material 20 on the inner layer side. From the position opposite to the winding start position of the strip 21, that is, from the winding start position of the inner layer side strip 21, the winding can be started from a position 180 ° opposite to the center axis of the annular bead core material 20.
- the reinforcing layer material 24 on the outer layer side can also be formed by methods other than the above.
- a bead core material 20 provided with a pair of reinforcing layer materials 22 and 24 is disposed on the outer peripheral side of the cylindrical carcass band, together with other tire constituent members as required, and each end portion of the carcass band is After folding around the bead core material 20 under the bulging deformation of the carcass band body part, a belt material and a tread rubber material are pasted on the bulging deformation part of the carcass band to form a green tire.
- the green tire can be vulcanized.
- two or more organic fiber reinforcing layers cover the entire peripheral surface of the bead core with a sufficiently thick rubber thickness by the rubber flow during vulcanization. It is possible to effectively prevent a decrease in the durability of the carcass ply due to the carcass ply main body being pressed against the bead core corner.
- the sizes of the test tires were 11.00R20 and 12.00R20 for each of the example tire and the conventional tire.
- Example tire 1 of size 12.00R20 has the same structure as tire 1 shown in FIGS. 1 and 2, and the material of the organic fiber cord of the two-layer organic fiber reinforcing layer formed around the bead core is nylon.
- the crossing angle of the organic fiber cords of the inner and outer layers was 100 °.
- the bead core of the example tire 1 has 6, 7, 8, 9, 10, as the number of cords arranged in the tire width direction increases from the inner side to the outer side in the tire radial direction.
- Nine steps were wound up and down in the order of 9, 8, 7, and 6, and the ratio of the length in the tire radial direction to the length in the tire width direction was set to 1: 1.5.
- Example tire 1 the distance in the tire width direction between the carcass ply main body portion and the corner portion of the bead core was 2.2 mm, and the rising angle of the carcass line was 65 °. Then, Example In the tire 1, the inner layer and the spacing I 1O in the tire radial direction outer side of the gap S of the reinforcing layer material of the outer layer side shown in FIG. 4, the I. 2O and 3 mm, the inner side in the tire radial direction distance I 1I, I2I was 2 mm.
- the tire 2 of the example has a gap I 1O and I 2O on the outer side in the tire radial direction of the gap S between the reinforcing layer materials on the inner layer side and the outer layer side of 6 mm, and the intervals I 1I and I 2I on the inner side in the tire radial direction are set to 5 mm.
- the gaps I 1O and I 2O on the outer side in the tire radial direction of the gap S between the reinforcing layer materials on the inner layer side and the outer layer side are 11 mm, and the gaps I 1I and I 2I on the inner side in the tire radial direction are 10 mm.
- the tire had the same structure as that of Example Tire 1.
- Example tires 4 and 5 the tire width direction distances of the carcass ply main body part and the bead core corner part of the example tire 1 are 1.9 mm and 3.3 mm, respectively, and the rising angle of the carcass line is 66 °, respectively. , 63 °. Further, Example Tire 5 has three organic fiber reinforcing layers. In addition, the structure of the reinforcement layer raw material of the 2nd layer and the 3rd layer is the same except the extending direction of an organic fiber cord.
- the tire 6 of the example has a tire size of 11.00R20, and the number of cords arranged in the tire width direction of the bead core is 5, 6, 7,
- the bead core is formed by increasing / decreasing in the order of 8, 9, 8, 7, 6, 5 and the ratio of the length in the tire radial direction to the length in the tire width direction is 1: 1, and the rising angle of the carcass line
- the tire had the same structure as Example tire 1 except that the angle was set to 70 °.
- the ratio of the length of the bead core in the tire radial direction to the length in the tire width direction was 1: 0.7, and the rising angle of the carcass line was 75 °.
- the distances I 1O and I 2O on the outer side in the tire radial direction of the gap S between the reinforcing layer materials on the inner layer side and the outer layer side of the example tire 7 are 11 mm, and the distances I 1I and I in the tire radial direction are 11 mm. 2I was 10 mm.
- the conventional tire 1 has a single layer of organic fiber reinforcement, except that the distance in the tire width direction between the carcass ply main body and the bead core corner is 1.1 mm, and the rising angle of the carcass line is 68 °.
- the tire tire had a structure similar to that of the example tire 1.
- the tire 2 of the conventional example has a tire size of 11.00R20, and the number of cords arranged in the tire width direction of the bead core is set to 7, 8 toward the outer side in the tire radial direction as shown in FIG.
- the bead core is formed by increasing / decreasing in the order of 9, 10, 9, 8, 7 and the ratio of the length in the tire radial direction to the length in the tire width direction is 1: 2, and the rising angle of the carcass line is 60
- the tire had the same structure as the conventional tire 1 except that
- the inner liner was peeled off, the tire was filled with oxygen, left in a thermostat for one month, and the residual force of PLY was measured according to JISZ2241.
- the results are shown in Table 1 together with the specifications of each test tire.
- the PLY residual force in Table 1 is represented by an index value based on the conventional tire 2, and the larger the value, the less the durability of the carcass ply is not lowered.
- Example tires 1 to 8 is wound with at least a portion provided with a clearance in the tire circumferential direction, and the organic fiber reinforcing layer on the outer layer side is provided so as to cover at least a portion of the clearance. Since the residual strength of the carcass ply is larger than that of a conventional tire having one organic fiber reinforcing layer, the pneumatic tire according to the present invention can prevent a decrease in the durability of the carcass ply. Theft was found.
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Abstract
Description
この場合において、リボン状ストリップの、ビードコア素材の周方向に隣接して巻回されるストリップ部分、特に、平行して延びる内部のコードの重なり合いに起因する、形成される有機繊維コード層素材の表面性状の悪化を防止するため、図7に、ストリップを巻回したビードコア素材を、側面図で示すように、ストリップ100は、周方向に隣接するストリップ部分100a、100bの相互を重ね合わせずに螺旋状に巻回する必要がある。
なおここで、「ビードコアの横断面中心線」とは、ビードコアのタイヤ幅方向断面の中心を通って、ビードコアの周方向に延びる環状の線をいう。
ここでいう「適応リム」とは、タイヤサイズに応じて下記の規格に規定されたリムをいい、「規定内圧」とは、下記の規格において、最大負荷能力に対応して規定される空気圧をいい、「最大負荷能力」とは、下記の規格でタイヤに負荷されることが許容される最大の質量をいう。
そして、その規格とは、タイヤが生産または使用される地域に有効な産業規格によって決められたものであり、例えば、アメリカ合衆国では、“THE TIRE AND RIM ASSOCIATION INC.のYEAR BOOK”であり、欧州では、“The European Tyre and Rim Technical OrganizationのSTANDARDS MANUAL”であり、日本では日本自動車タイヤ協会の“JATMA YEAR BOOK”である。
なお、ビードコアを、一本もしくは複数本のスチール製等のコードを、タイヤ幅方向に複数列に巻き回すとともに、タイヤ半径方向に複数段に巻き重ねて形成する場合は、ここでいう、カーカスプライ本体部とビードコア角部との距離は、ビードコアの、前記本体部側の角部に位置するコードの表面と、カーカスプライのプライコードの表面との、タイヤ幅方向の最短距離を意味する。
そして、外層側の有機繊維補強層を、前記隙間の少なくとも一部を覆うように設けることで、ビードコアの周面全体にわたってゴム層の厚みを確保することができる。
これはすなわち、カーカスプライ本体部とビードコア角部との距離を2mm未満とした場合は、カーカスプライ本体部の、ビードコア角部からの距離が小さいことによって、カーカスプライへの応力集中を十分に軽減できないおそれがあり、この一方で、前記距離を、3mmを超えるものとした場合は、ビードコアによる、カーカスプライの係留力が低下する懸念があることの他、ゴムボリュームの増大によって、ビード部での発熱量の増大を招くおそれもある。
つまり、ビードコアの、タイヤ半径方向長さに対するタイヤ幅方向長さの比を、1.2を超えるものとした場合は、ビードコアの、カーカスプライ本体部側の角部の開き角度が小さくならないことから、カーカスプライへの応力集中を軽減する効果を十分に得ることができないおそれがある。この一方で、ビードコアの前記長さの比を、0.8未満とした場合は、ビード部の剛性が低下する結果、操縦安定性が低下する恐れがある。
これがため、製造されるタイヤで、ビードコアの周囲に形成される二層以上の有機繊維補強層によって、ビードコアの周面が全体にわたって、十分に厚いゴム厚みで被覆されることになるので、カーカスプライへの応力集中を有効に軽減できるタイヤを製造することができる。
図1に例示する空気入りタイヤ1は、ビード部2に埋設配置した一対の環状のビードコア3と、一対のビードコア3間にトロイダルに延在する本体部4aおよび、本体部4aに連続して、ビードコア3の周りで、ここでは、タイヤ幅方向内側から外側に折り返してなる折り返し部4bを有するカーカスプライ4と、カーカスプライ4のクラウン域の外周側に配設した、たとえば二層のベルト層からなるベルト5と、ベルト5の外周側に配設したトレッドゴム6とを具えてなる。
この場合は、図3に模式図で示すように、ビードコア3の、カーカスプライ本体部4a側の角部3aの開き角度、すなわち、六角形状をなすビードコア3の角部3aでの内角θが、図に仮想線で示す従来のものよりも大きくなって、この角部3aに押圧されるカーカスプライ本体部4aへの応力集中をより一層軽減できる他、ビードコア3のタイヤ幅方向断面の中心位置よりもタイヤ半径方向外側に存在するカーカスプライ本体部4aのカーカスラインの、タイヤ幅方向に対する鋭角側の立上がり角度αが、従来のものより大きくなることから、カーカスプライ4への、図に矢印で示す向きの引張力Tの作用に起因して、カーカスプライ本体部4aがビードコア角部3aから受ける押圧反力Fを軽減することができ、これがため、カーカスプライ4の耐久性の低下をより効果的に防止することができる。
なお、カーカスラインの前記立上がり角度αは、たとえば、60°~70°の範囲内とすることができる。
また、カーカスラインの前記立上がり角度αを計測するに当たっては、規定内圧を充填した無負荷状態の下、図示のタイヤ幅方向断面で、ビードコア3の中心Cおよび、ビードコア3の径方向最外側点のそれぞれを通る、タイヤ幅方向に平行な二直線のそれぞれを引き、そして、それらの二直線のそれぞれとカーカスプライの本体部4aとの二個の交点の相互を結んだ直線の、タイヤ幅方向に対する鋭角側の角度を測定することにより行うことができる。
また、ベルト5は、たとえば、スチールコード等を、タイヤ赤道面に対して、20°~60°の範囲内の角度で傾斜させて延在させてなる、図では二層のベルト層で構成することができ、ここでは、これらのベルト層のそれぞれのコードを、トレッド周方向に対して相互に逆方向に延在させる。
これにより、有機繊維補強層の内層側に含まれる有機繊維コードが重なり合うことを防止して、ビードコアからカーカスプライに局所的に大きな力が加わることを防止することができる。
また、後述する二層目(外層側)以降の補強層素材の形成に際しても、隣り合うストリップ部分を相互に重ね合わせずにストリップを巻回して、それぞれの補強層素材での、コードの平行な重なり合いを防止することで、最外層の補強層素材の表面性状を十分に適正なものとすることができ、それによって、最外層補強層素材の表面性状が、それの周囲に配設されるカーカスプライ素材等に及ぼす影響を十分に小さくすることができる。
なお、この明細書において、内層側の補強層素材の隙間Sの間隔I1O、I1I及び後述する外層側(二層目以降)の補強層素材の隙間Sの間隔I2O、I2Iとは、タイヤ周方向の全周のそれぞれの隙間での間隔の平均値で表すものとする。
二層目の補強層素材24を形成するに当っては、上述した一層目の形成で、環状ビードコア素材20の周方向に隣接するストリップ部分21a、21bを相互に重ね合わせずに巻回したことによって、それらの相互間に生じた隙間Sを極力、好ましくは完全に、覆うように、一層目の補強層素材22の前記隙間Sの外周側で、ストリップ23を延在させる。これにより、ビードコアの周面全体にわたってゴム層の厚みを確保することができる。
また、一層目と二層目の補強層素材22、24の層間での、有機繊維コードの平行な重なり合いをも防止するため、二層目を形成するストリップ23は、図5に拡大平面図で示すように、一層目のストリップ21の延在方向と交差する方向に巻回する。
二層目の補強層素材24を形成するにあたり、タイヤ径方向内側の間隔I2Iを、たとえば0mm<I2I≦10mm の範囲内で設けて、リボン状ストリップ23を巻回することが、補強層素材のカーカスプライに近い層で、有機繊維コードが重なり合うことを防止して、ビードコアからカーカスプライに局所的に大きな力が加わることを防止する点で好ましい。なお好ましくは、0mm<I2I≦5mm とする。
そして、図示は省略するが、三層以上の補強層素材を形成する場合も同様にして、外層側のストリップを、内層側のストリップ部分の相互間の外周側で、内層側のストリップの延在方向に交差させ、好ましくは間隔I2O、I2Iを設けて巻回することで行うことができる。
供試タイヤのサイズは、実施例タイヤおよび従来例タイヤのそれぞれについて、11.00R20および12.00R20の二種類とした。
また、実施例タイヤ1のビードコアは、図6(a)に示すように、タイヤ幅方向のコードの整列本数を、タイヤ半径方向内側から外側に向かうに従い、6、7、8、9、10、9、8、7、6の順に増減させて、9段巻き重ねて形成し、タイヤ半径方向の長さとタイヤ幅方向の長さの比を1:1.5とした。
なお、実施例タイヤ1では、カーカスプライ本体部と、ビードコアの角部とのタイヤ幅方向距離を2.2mmとし、カーカスラインの立上がり角度を65°とした。
そして、実施例タイヤ1では、図4に示す内層側及び外層側の補強層素材の隙間Sのタイヤ径方向外側での間隔I1O、I2Oを3mmとし、タイヤ径方向内側の間隔I1I、I2Iを2mmとした。
実施例タイヤ4、5は、実施例タイヤ1の、カーカスプライ本体部とビードコア角部とのタイヤ幅方向距離を、それぞれ1.9mm、3.3mmとし、カーカスラインの立上がり角度を、それぞれ66°、63°とした。また、実施例タイヤ5は、有機繊維補強層を3層とした。なお二層目と三層目の補強層素材の構成は、有機繊維コードの延在方向を除いて同一である。
実施例タイヤ6は、タイヤサイズが11.00R20であり、ビードコアのタイヤ幅方向のコード整列本数を、図6(b)に示すように、タイヤ半径方向外側に向けて、5、6、7、8、9、8、7、6、5の順に増減させてビードコアを形成して、それの、タイヤ半径方向の長さとタイヤ幅方向の長さとの比を1:1とし、カーカスラインの立上がり角度を70°としたことを除いて、実施例タイヤ1と同様の構造を有するものとした。
実施例タイヤ7は、ビードコアのタイヤ半径方向の長さとタイヤ幅方向の長さとの比を1:0.7とし、カーカスラインの立上がり角度を75°とした。
実施例タイヤ8は、実施例タイヤ7の、内層側及び外層側の補強層素材の隙間Sのタイヤ径方向外側の間隔I1O、I2Oを11mmとし、タイヤ径方向内側の間隔I1I、I2Iを10mmとした。
また、従来例タイヤ2は、タイヤサイズが11.00R20であり、ビードコアのタイヤ幅方向のコード整列本数を、図6(c)に示すように、タイヤ半径方向外側に向けて、7、8、9、10、9、8、7の順に増減させてビードコアを形成して、それの、タイヤ半径方向の長さとタイヤ幅方向の長さとの比を1:2とし、カーカスラインの立上がり角度を60°としたことを除いて、従来例タイヤ1と同様の構造を有するものとした。
この結果を、各供試タイヤの諸元とともに表1に示す。表1のPLY残留力は、従来例タイヤ2を基準とした指数値で表したものであり、この数値が大きいほど、カーカスプライの耐久性が低下していないことを意味する。
2 ビード部
3 ビードコア
4 カーカスプライ
4a 本体部
4b 折り返し部
5 ベルト
6 トレッドゴム
7、8 有機繊維補強層
20 ビードコア素材
21、23 リボン状ストリップ
21a、21b ストリップ部分
22、24 補強層素材
C ビードコア横断面中心線
C1 ビードコア素材の横断面中心線
D カーカスプライ本体部とビードコア角部とのタイヤ幅方向距離
θ ビードコアの角部での内角
α カーカスラインの立上がり角度
β 内外層のストリップの交差角度
T カーカスプライへの引張力
F カーカスプライ本体部への押圧反力
S 隙間
I1O、I1I、I2O、I2I 間隔
Claims (4)
- ビード部に埋設配置した一対の環状のビードコアと、
一対のビードコア間にトロイダルに延びる本体部および、該本体部に連続してビードコアの周りで折り返してなる折り返し部を有する少なくとも一枚のカーカスプライからなるカーカスと、
該カーカスのクラウン域の外周側に配設したトレッドゴムとを具え、
前記ビードコアの、タイヤ幅方向の断面形状を、カーカスプライの本体部側に一箇所以上の角部を有する多角形としてなる空気入りタイヤであって、
前記ビードコアの周囲に、ゴム被覆した、一本もしくは複数本の有機繊維コードを、ビードコアの横断面中心線に対して傾斜させて螺旋状に巻回してなる有機繊維補強層を少なくとも二層積層させて設け、
ビードコアの周囲の、内外に隣接する前記有機繊維補強層のそれぞれの有機繊維コードを、ビードコアの横断面中心線に対して互いに交差する向きに延在させ、
前記内外に隣接する有機繊維補強層のうち、内層側の有機繊維補強層は、前記ゴム被覆した有機繊維コードがタイヤ周方向に重なり合うことなく、少なくとも一部にタイヤ周方向の隙間を設けて巻回され、外層側の有機繊維補強層は、前記隙間の少なくとも一部を覆うように設けられてなる空気入りタイヤ。 - カーカスプライの本体部と、ビードコアの、該本体部側の角部との、タイヤ幅方向の距離を、2mm以上かつ3mm以下としてなる請求項1に記載の空気入りタイヤ。
- タイヤ幅方向断面にて、前記ビードコアの、タイヤ半径方向の長さと、タイヤ幅方向の長さとの比を、1:0.8~1.2とする請求項1または2に記載の空気入りタイヤ。
- 空気入りタイヤを製造する方法であって、
環状をなすビードコア素材の周囲に、二層以上の有機繊維補強層素材を形成するに当り、
ビードコア素材の周囲に、有機繊維コードに未加硫ゴムを被覆してなるリボン状ストリップを、ビードコア素材の横断面中心線に対して傾斜させて延在させるとともに、
該リボン状ストリップを、ビードコア素材の周方向に隣接するストリップ部分を相互に重ね合わせずに螺旋状に巻き回して、内層側の補強層素材を形成し、
しかる後、内層側の補強層素材の周囲に、リボン状ストリップを、内層側の補強層素材の、前記ストリップ部分の相互間に生じる隙間の外周側で、内層側の補強層素材のストリップ延在方向と交差する方向に螺旋状に巻き回して、外層側の補強層素材を形成する、空気入りタイヤの製造方法。
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CN201280035572.2A CN103717415B (zh) | 2011-07-27 | 2012-07-24 | 充气轮胎及该充气轮胎的制造方法 |
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JP2017537842A (ja) * | 2014-12-16 | 2017-12-21 | ブリヂストン アメリカズ タイヤ オペレーションズ、 エルエルシー | オーバーモールドされたビード構造を有するタイヤ、空気入りタイヤ用のビード |
JP6004045B1 (ja) * | 2015-05-27 | 2016-10-05 | 横浜ゴム株式会社 | 空気入りタイヤ |
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KR20190045291A (ko) * | 2016-09-07 | 2019-05-02 | 바텔 머시너리 시스템즈, 엘.엘.씨. | 차량 타이어를 위한 비드-에이펙스 조립체 |
JP2019098991A (ja) * | 2017-12-05 | 2019-06-24 | Toyo Tire株式会社 | グリーンタイヤ及び空気入りタイヤの製造方法 |
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Cited By (2)
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JP2016088259A (ja) * | 2014-11-04 | 2016-05-23 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
CN107953726A (zh) * | 2017-12-07 | 2018-04-24 | 合肥万力轮胎有限公司 | 一种轮胎用钢丝圈结构、缠绕盘及缠绕方法 |
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US9776460B2 (en) | 2017-10-03 |
EP2738021A4 (en) | 2015-04-08 |
EP2738021A1 (en) | 2014-06-04 |
US20140144567A1 (en) | 2014-05-29 |
CN103717415B (zh) | 2016-04-27 |
EP2738021B1 (en) | 2016-07-20 |
JPWO2013014919A1 (ja) | 2015-02-23 |
CN103717415A (zh) | 2014-04-09 |
JP5878534B2 (ja) | 2016-03-08 |
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