WO2013088936A1 - 空気入りタイヤ及びその製造方法 - Google Patents
空気入りタイヤ及びその製造方法 Download PDFInfo
- Publication number
- WO2013088936A1 WO2013088936A1 PCT/JP2012/080311 JP2012080311W WO2013088936A1 WO 2013088936 A1 WO2013088936 A1 WO 2013088936A1 JP 2012080311 W JP2012080311 W JP 2012080311W WO 2013088936 A1 WO2013088936 A1 WO 2013088936A1
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- WIPO (PCT)
- Prior art keywords
- wire
- tire
- bead
- core
- winding
- Prior art date
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Classifications
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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
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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)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/16—Applying the layers; Guiding or stretching the layers during application
- B29D30/1621—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it spirally, i.e. the band is fed without relative movement along the core axis, to form an annular element
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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)
- B29D30/08—Building tyres
- B29D30/34—Building tyres by jointly covering two bead-rings, located parallel to each other at a distance apart, with fabric or cord layers
-
- 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
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
- B60C15/0018—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion not folded around the bead core, e.g. floating or down ply
-
- 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
-
- 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
- B29D2030/485—Bead-rings or bead-cores; Treatment thereof prior to building the tyre the bead cores being made using a band containing a plurality of wires embedded in rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2305/00—Use of metals, their alloys or their compounds, as reinforcement
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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
- B60C2015/046—Cable cores, i.e. cores made-up of twisted wires
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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
- B60C2015/048—Polygonal cores characterised by the winding sequence
Definitions
- the present invention relates to a pneumatic tire having improved uniformity by improving the shape of a wire wound body forming a bead core and a method for manufacturing the same.
- a method for manufacturing a pneumatic tire using a core N having an outer peripheral surface that approximates the shape of the inner surface of the tire during internal pressure filling (hereinafter referred to as “core method”). )
- core method a method for manufacturing a pneumatic tire using a core N having an outer peripheral surface that approximates the shape of the inner surface of the tire during internal pressure filling.
- Patent Document 1 Is proposed by the following Patent Document 1.
- tire structures such as an inner liner 9, inner and outer apex rubbers 8i and 8o, a carcass ply 6A, a bead core 5, a belt layer 7, a tread rubber 2G, and a side wall rubber 3G.
- the members are sequentially attached to form the raw cover 1a.
- This raw cover 1a is usually put into a vulcanization mold together with the core N and vulcanized.
- This core method has an advantage that the uniformity of the pneumatic tire 1 is improved because the stretch acting on the carcass and belt during vulcanization can be kept
- the bead core 5 of the raw cover 1a formed by the core method employs a structure in which the wire wound body 10 in which the bead wires 10a are wound is arranged on both sides or one side (both sides in this example) of the carcass ply 6A.
- a wire wound body 10 as shown in FIG. 6B, for example, a single bead wire 10a wound in a spiral shape has been used.
- the bead wire 10a is wound in a spiral shape while gradually increasing the radius R from the winding center 10c. Therefore, in the above-described wire wound body 10, since the radius R changes, the winding center 10c and the center of gravity 10g of the wire wound body 10 tend to be displaced, which causes a decrease in uniformity. Yes.
- the main object of the present invention is to provide a pneumatic tire with improved uniformity and a method for manufacturing the same, as a basis for improving the shape of the wire wound body forming the bead core.
- the invention according to claim 1 is a pneumatic tire comprising a tread portion, a pair of sidewall portions, a pair of bead portions each having a bead core, and a carcass extending between the bead cores.
- At least one of the bead cores includes a wire wound body in which a plurality of layers of the bead wires are formed in the tire radial direction by winding a single bead wire in a spiral shape around the tire rotation axis.
- the wire wound body includes a first portion and a second portion;
- the first portion includes a plurality of bead wire layers extending in a tire circumferential direction with a constant radius R from a tire rotation axis;
- the second portion includes a plurality of bead wire layers extending in a tire circumferential direction with a radius R varying from a tire rotation axis.
- the invention of claim 8 is a tire manufacturing method for forming the pneumatic tire according to claims 1 to 7, Comprising a wound body forming step of forming a wire wound body by winding a single bead wire in a spiral shape a plurality of times on the wire bonding surface on the side surface side of the core;
- the winding body forming step includes a wire fixing step of pressing and fixing the winding start end of the bead wire to the wire application surface, and then winding the bead wire by rotating the core around the tire rotation axis CL.
- a wire winding process In the wire winding step, A first rotation step of rotating the core N while fixing an angle ⁇ 1 formed by a Y-axis direction that is a supply direction of the bead wire and a tire rotation axis CL; The second rotation step of rotating the core N while gradually increasing the angle ⁇ 1 is performed alternately.
- the bead core of the pneumatic tire according to the present invention includes a wire wound body in which one bead wire is wound in a spiral shape around the tire rotation axis.
- the wire wound body includes a first portion and a second portion, and the first portion includes a plurality of layers of the bead wires extending in the tire circumferential direction with a constant radius R from the tire rotation axis.
- the second portion has a plurality of bead wire layers extending in the tire circumferential direction with a radius R varying from the tire rotation axis.
- Such a wire wound body having a first portion with a constant radius R is close to the center of rotation of the tire, which is the center of winding, and the center of gravity, thereby improving tire uniformity.
- FIG. 1 It is sectional drawing which shows the right half of one Example of the pneumatic tire of this invention.
- (A) is a side view of one Embodiment of a wire winding body
- (b) is a side view of other embodiment.
- (A) is sectional drawing of the right half of the raw cover obtained by a core method
- (b) is a side view explaining the wire winding body of a prior art example.
- a pneumatic tire (hereinafter, simply referred to as “tire”) 1 of the present embodiment 1 has a tread portion 2, a pair of sidewall portions 3, and a bead core 5. And a carcass 6 extending between the bead cores 5 and 5.
- a tire 1 of this example is a tire for a passenger car, and includes a belt layer 7 disposed outside the carcass 6 in the tire radial direction and inside the tread portion 2, and an inner liner 9 disposed inside the carcass 6. And more.
- the inner liner 9 is made of rubber having excellent air impermeability, and is disposed along the tire lumen surface i.
- FIG. 1 shows a tire 1 in a normal state in which a normal rim (not shown) is assembled with a rim and filled with a normal internal pressure and is in an unloaded state.
- the “regular rim” is a rim determined for each tire in the standard system including the standard on which the tire is based, for example, a standard rim for JATMA, “Design Rim” for TRA, For ETRTO, use “Measuring” Rim.
- Regular internal pressure is the air pressure that each standard defines for each tire in the standard system including the standards on which the tires are based. The maximum air pressure is JATMA, and the table is “TIRE LOAD LIMITS AT” for TRA. VARIOUS VCOLD INFLATION PRESSURES ”maximum value, if ETRTO,“ INFLATION PRESSURE ”, but if the tire is for passenger cars, 180kPa.
- the carcass 6 includes a carcass ply 6A that extends from the tread portion 2 through the sidewall portion 3 to the bead core 5 of the bead portion 4.
- the carcass ply 6A includes a carcass cord made of, for example, an organic fiber.
- the carcass cords are arranged at an angle of, for example, 75 to 90 ° with respect to the tire equator C.
- the inner end portions 6e on both sides of the carcass ply 6A end at the position of the bead core 5 without being folded around the bead core 5.
- the belt layer 7 is formed of at least two belt plies 7A and 7B which are arranged outside and inside in the tire radial direction in this example.
- Each of the belt plies 7A and 7B has a highly elastic belt cord such as a steel cord arranged at an angle of 15 to 40 ° with respect to the tire equator C.
- the belt plies 7A and 7B are overlapped so that the belt cords cross each other.
- the bead portion 4 is provided with chafer rubber 4g made of hard rubber in order to prevent wear due to contact with a rim (not shown).
- the chafer rubber 4g of this example has a substantially U-shaped cross section including a base portion 4ga along the tire cavity surface i and a sub-portion 4gb that is continuous with the base portion 4ga and forms the bottom surface and the outer surface of the bead portion 4. .
- the bead portion 4 is provided with an inner apex rubber 8i and an outer apex rubber 8o on the inner and outer sides of the carcass 6 in the tire axial direction in order to increase the rigidity of the bead portion 4.
- the inner and outer apex rubbers 8o each taper outwardly in the tire radial direction.
- the bead core 5 includes a wire wound body 10 in which a single bead wire 10a is wound in a spiral shape in the tire radial direction along the carcass ply 6A.
- a case where the bead wires 10a are wound in a line is shown.
- it is not limited to one row, and it may be formed of a plurality of rows of two rows or more.
- the bead core 5 includes an inner wire wound body 10 disposed on the inner side in the tire axial direction of the carcass ply 6A, and an outer wire wound body disposed on the outer side in the tire axial direction of the carcass ply 6A. 10.
- the inner wire wound body may be referred to as 11 and the outer wire wound body may be referred to as 12.
- the inner end portion 6e of the carcass ply 6A is held between the inner wire winding body 11 and the outer wire winding body 12.
- the case where the number of windings of the inner wire winding body 11 and the number of windings of the outer wire winding body 12 are the same is shown. However, it is not limited to this aspect.
- one bead wire 10a is wound in a spiral shape around the tire rotation axis CL as a winding center 10c. As a result, a plurality of layers of the bead wire 10a are formed in the tire radial direction.
- the wire wound body 10 includes a first portion 13 and a second portion 14.
- the first portion 13 includes a plurality of layers of the bead wires 10a extending in the tire circumferential direction with a constant radius R from the tire rotation axis CL.
- the second portion 14 has a plurality of layers of the bead wires 10a extending in the tire circumferential direction with a radius R changing from the tire rotation axis CL.
- the center of gravity 10g of the wire wound body 10 is formed near the winding center 10c. That is, since the center of gravity 10g of the wire wound body 10 is formed near the tire rotation axis CL, the uniformity of the tire 1 is improved.
- the first portion 13 occupies most of the wire wound body 10.
- the central angle ⁇ 1 of the second portion 14 around the tire rotation axis CL is 4 to 20 °. Since the bead wire 10a has high rigidity, if the central angle ⁇ 1 is too small, the shape of the second portion 14 is not maintained, and the uniformity may be deteriorated. Conversely, if the center angle ⁇ 1 is too large, the winding center 10c of the wire wound body 10 and the center of gravity 10g of the wire wound body 10 may be greatly displaced. For this reason, the lower limit of the central angle ⁇ 1 is preferably 4 ° or more, and more preferably 8 ° or more. The upper limit of the central angle ⁇ 1 is preferably 20 ° or less, and more preferably 16 ° or less.
- the radius R of the second portion 14 gradually increases from the start end 10s in the winding direction of the bead wire 10a toward the end 10e.
- the radius R of the second portion 14 gradually increases from the end 13e of the first portion 13 to the end 14e of the second portion 14 by an amount corresponding to the diameter d of the bead wire 10a.
- the second portion 14 is formed as a straight portion 14a extending linearly from the end 13e of the first portion 13 to the end 14e of the second portion 14.
- the present invention is not limited to such an embodiment, and may be formed as, for example, a curved portion 14b (shown in FIG. 2B) that is curved in an arc shape.
- the layers 10a1 and 10a2 of the bead wires 10a adjacent in the tire radial direction are stacked without a gap.
- the wire winding body 10 becomes nearly circular, and the positional deviation between the center of gravity 10g of the wire winding body 10 and the winding center 10c is further reduced.
- the winding end 10e of the wire wound body 10 is disposed at a position that coincides with the outer side in the tire radial direction of the winding start end 10s.
- the winding end 10e is located on a radial line passing through the winding start end 10s and the tire rotation axis CL.
- the positional deviation between the center of gravity 10g and the winding center 10c is further reduced.
- the pneumatic tire 1 configured as described above is manufactured by vulcanizing a raw cover 1a as shown in FIG. 6 (a).
- FIG. 6 (a) an example of the manufacturing apparatus M used for the manufacturing method of the pneumatic tire 1 (raw cover 1a) of this embodiment is demonstrated.
- the manufacturing apparatus M rotates a core N having an outer surface capable of forming a lumen surface i (shown in FIG. 1) of the pneumatic tire 1 and the core N.
- the core N in this example includes an outer surface N1 for forming a tire and a pair of flange surfaces F protruding outward in the tire axial direction from the bead side end of the outer surface N1.
- the outer surface N1 has, for example, a three-dimensional shape that approximates the inner surface i of the tire in a 5% internal pressure state.
- the “5% internal pressure state” means a state in which the internal pressure is reduced from the normal state to an internal pressure of 5% of the normal internal pressure.
- the core N is preferably made of a metal material or a heat resistant resin that can withstand heat and pressure during vulcanization.
- the outer surface N1 of the core N includes a pair of bead molding surfaces Na for molding the tire lumen surface of the bead portion 4.
- the rotating device Q of this example includes, for example, an L-shaped rotation support body 15 and, for example, a rectangular support base 16 that supports the rotation support body 15 in a turnable manner.
- the rotary support 15 includes a first support shaft 17 extending in the horizontal direction and a second support shaft 18 extending in the vertical Z-axis direction.
- the first support shaft 17 is disposed on one end side of the rotation support 15 and supports the core N so as to be rotatable around the tire rotation axis CL.
- the second support shaft 18 is disposed on the other end side of the rotation support body 15 and supports the rotation support body 15 so as to be rotatable around a vertical rotation axis Ca.
- a rotation angle and a turning angle around the tire rotation axis CL are program-controlled by a computer.
- the pivot axis Ca passes through the center O of the core N.
- the center O means a point where the equator plane of the core N and the tire rotation axis CL intersect.
- the support base 16 is supported so as to be movable in the Y-axis direction. In this example, this movement is performed by a guide rail 23b extending in the Y-axis direction and a slide mechanism 23a such as a bearing attached to the bottom surface 16a of the support base 16 and guided by the guide rail 23b.
- the said sticking apparatus P contains the conveyance roller 19, the press roller 20, and the cutting tool 21, for example.
- the conveyance roller 19 supplies the core N with a bead wire 10a fed from the upstream side of the sticking device P.
- the pressing roller 20 affixes the bead wire 10 a supplied in the Y-axis direction by the conveying roller 19 to the outer surface N1 of the core N.
- the cutting tool 21 cuts the bead wire 10a.
- the outer peripheral surface of the bead wire 10a is previously covered with unvulcanized rubber in order to facilitate attachment.
- the conveying roller 19 includes a plurality of guide rollers 19a for removing the brazing of the bead wire 10a.
- the guide roller 19a is rotatably attached to, for example, a plate-like fixture 22 so that the equator 19C (shown in FIG. 4) of each guide roller 19a is linear along the Y-axis direction.
- the pressing roller 20 includes, for example, a roller body 20a that attaches the bead wire 10a to the core N, and a driving tool 20b such as a cylinder that presses the roller body 20a against the core N.
- a roller body 20a is disposed on the equator 19C of the transport roller 19 (shown in FIG. 4).
- the cutting tool 21 includes, for example, a push-cut cutter 21a and a lifting tool 21b such as a cylinder for lifting and lowering the cutter 21a.
- the bead wire 10a is cut by pressing the cutter 21a with the lifting tool 21b.
- the core N is supported by the first support shaft 17 of the rotating device Q so as to be rotationally driven.
- the sticking device P is disposed at a standby position apart from the core N as an initial state.
- the base portion 4ga of the chafer rubber 4g and the inner liner 9 are attached to the outer surface N1 of the core N.
- the inner apex rubber 8i is attached to the outside of the base portion 4ga and the inner liner 9 (shown in FIG. 5).
- the outer surface of the inner apex rubber 8i is the wire sticking surface S1 of the bead wire 10a.
- the bead molding surface Na of the core N is set at a predetermined position close to the pressing roller 20 of the sticking device P.
- the tire rotation axis CL of the core N and the equator 19C (shown in FIG. 4) of the conveying roller 19 of the sticking device P are arranged in parallel with each other in the initial state. Further, the rotation axis Cr of the roller body 20a and the tire rotation axis CL of the core N are arranged at the same height.
- a wound body forming step for forming the inner wire wound body 11 is performed.
- the bead wire 10a is stuck to the wire sticking surface S1 with the tire rotation axis CL as the center 10c.
- the winding body forming step includes a wire adhering step (shown in FIG. 5) for adhering the winding start end 10s of the bead wire 10a to the wire adhering surface S1, and the core N after the wire adhering step.
- a wire winding step shown in FIG. 4 for winding the bead wire 10a by rotating around the core CL.
- the driving tool 20b of the pressing roller 20 advances toward the core N, and the winding start end 10s passes through the roller body 20a. Pressed against the surface S1. Accordingly, the winding start end 10s is fixed to a predetermined position of the wire sticking surface S1 (in this example, the position of the inner end 8e in the tire radial direction of the inner apex rubber 8i). At this stage, since the inner apex rubber 8i is also unvulcanized, the bead wire 10a is easily fixed to the inner apex rubber 8i.
- the second rotation step of rotating the core N while gradually increasing ⁇ 1 is performed alternately.
- the angle ⁇ 1 is constant. Therefore, the bead wire 10a is affixed to the wire affixing surface S1 with the radius R around the tire rotation axis CL being constant. That is, the first portion 13 is manufactured by the first rotation process.
- the angle ⁇ 1 is increased by turning the core N clockwise around the turning axis Ca in FIG.
- the winding radius R of the bead wire 10a also increases.
- the core N is rotated around the tire rotation axis CL while gradually increasing the angle ⁇ 1 by turning around the turning axis Ca.
- the bead wire 10a is stuck to the wire sticking surface S1 while gradually increasing the radius R. That is, the second portion 14 is manufactured by the second rotation process.
- the dashed-two dotted line of FIG. 4 represents the position of the core N in the initial state of a bead wire winding process.
- the core N In the second rotation process, when the core N is simply swung around the swivel axis Ca, the wire sticking surface S1 moves relatively toward the roller body 20a. Therefore, in the second rotation step, the core N is turned around the turning axis Ca and at the same time, the core N is moved away from the pressing roller 20. Thereby, the distance L between the roller body 20a and the wire sticking surface S1 can be kept substantially constant on the equator 19C. Specifically, the distance L is kept substantially constant by moving the support base 16 in the Y-axis direction. Thereby, since unnecessary bending and tension
- the layers 10a1 and 10a2 of the bead wires 10a adjacent in the tire radial direction overlap with each other without any gap, so that the layers 10a1 and 10a2 adhere to each other. Thereby, rewinding of the bead wire 10a is prevented. Further, the strength of the wire wound body 10 is ensured to be high, and the narrow pressure between the wire wound bodies 10 and 10 is also increased.
- the carcass ply 6A is pasted on the outer side in the tire axial direction of the inner wire wound body 11.
- the carcass ply 6A is composed of a plurality of strip-shaped ply pieces (not shown) divided in the tire circumferential direction.
- the ply pieces are sequentially arranged in the tire circumferential direction, A carcass ply 6A continuous in the direction is formed.
- a wound body forming step of forming the outer wire wound body 12 on the wire sticking surface S2 which is the outer surface in the tire axial direction of the carcass ply 6A is performed.
- This process is substantially the same as the wound body forming process for forming the inner wire wound body 11, and includes a wire winding process in which the bead wire 10a is attached around the tire rotation axis CL.
- the outer apex rubber 8o, the sub portion 4gb of the chafer rubber 4g, the belt layer 7, the side wall rubber 3G, the tread rubber 2G, and the like are pasted. .
- the raw cover 1a is formed on the outer surface N1 of the core N.
- the tire 1 of the present invention is manufactured.
- the tire 1 of this invention is not limited to the above manufacturing methods.
- a pneumatic tire of size 215 / 45R17 having the structure of FIG. 1 and having the wire wound body of FIGS. 2 (a), 2 (b) and 6 (b) was prototyped based on the specifications in Table 1, Test tire uniformity was tested.
- the test method is as follows.
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Abstract
Description
前記ビードコアの少なくとも一つは、1本のビードワイヤをタイヤ回転軸芯の回りに複数回渦巻状に巻重ねることにより、タイヤ半径方向に前記ビードワイヤの複数の層が形成されたワイヤ巻重ね体を具え、
前記ワイヤ巻重ね体は、第1部分と、第2部分とを含み、
前記第1部分は、タイヤ回転軸芯から一定の半径Rでタイヤ周方向にのびる複数の前記ビードワイヤの層を有し、
前記第2部分は、タイヤ回転軸芯から変化する半径Rでタイヤ周方向にのびる複数の前記ビードワイヤの層を有することを特徴としている。
中子の側面側のワイヤ貼付面上で、1本のビードワイヤを渦巻き状に複数回巻き重ねることによりワイヤ巻重ね体を形成する巻重ね体形成工程を具え、
前記巻重ね体形成工程は、前記ビードワイヤの巻付け始端を前記ワイヤ貼付面に押し付けて固着するワイヤ固着工程と、その後、前記中子をタイヤ回転軸芯CL回りで回転させることにより前記ビードワイヤを巻き付けるワイヤ巻重ね工程とを具えるとともに、
前記ワイヤ巻重ね工程では、
前記ビードワイヤの供給方向であるY軸方向とタイヤ回転軸芯CLとがなす角度α1を固定して前記中子Nを回転させる第1回転工程と、
前記角度α1を漸増させながら中子Nを回転させる第2回転工程とが交互に行われることを特徴としている。
図1に示されるように、本実施形態の空気入りタイヤ(以下、単に「タイヤ」ということがある。)1は、トレッド部2と、一対のサイドウォール部3と、それぞれにビードコア5が配された一対のビード部4と、前記ビードコア5、5間をのびるカーカス6とを具える。本例のタイヤ1は、乗用車用タイヤであって、前記カーカス6のタイヤ半径方向外側かつ前記トレッド部2の内部に配されたベルト層7と、前記カーカス6の内側に配されるインナーライナ9とをさらに具える。前記インナーライナ9は、空気非透過性に優れたゴムからなり、タイヤ内腔面iに沿って配される。
テスト方法は、次の通りである。
JASO C607のユニフォミティ試験条件に準拠し、50本のタイヤに対して、RFV(ラジアルフォースバリエーション)が測定された。各タイヤのRFVの平均値(N)を、比較例1のRFVの平均値を100とする指数で表示した。数値が小さいほど良好である。
テストの結果が表1に示される。
2 トレッド部
3 サイドウォール部
4 ビード部
5 ビードコア
6 カーカス
10、11、12 ワイヤ巻重ね体
10a ビードワイヤ
13 第1部分
14 第2部分
CL タイヤ回転軸芯
R 半径
Claims (10)
- トレッド部と、一対のサイドウォール部と、それぞれにビードコアが配された一対のビード部と、前記ビードコア間をのびるカーカスとを具えた空気入りタイヤであって、
前記ビードコアの少なくとも一つは、1本のビードワイヤをタイヤ回転軸芯の回りに複数回渦巻状に巻重ねることにより、タイヤ半径方向に前記ビードワイヤの複数の層が形成されたワイヤ巻重ね体を具え、
前記ワイヤ巻重ね体は、第1部分と、第2部分とを含み、
前記第1部分は、タイヤ回転軸芯から一定の半径Rでタイヤ周方向にのびる複数の前記ビードワイヤの層を有し、
前記第2部分は、タイヤ回転軸芯から変化する半径Rでタイヤ周方向にのびる複数の前記ビードワイヤの層を有することを特徴とする空気入りタイヤ。 - 前記第2部分は、タイヤ回転軸芯を中心とした中心角θ1が、4~20度の範囲であることを特徴とする請求項1記載の空気入りタイヤ。
- 前記第2部分は、ビードワイヤの巻き付け方向の始端側から終端側に向かって前記半径Rが漸増することを特徴とする請求項2記載の空気入りタイヤ。
- 前記ビードコアは、前記カーカスプライのタイヤ軸方向の内側に配される内側のワイヤ巻重ね体と、前記カーカスプライのタイヤ軸方向外側に配される外側のワイヤ巻重ね体とからなることを特徴とする請求項1~3の何れかに記載の空気入りタイヤ。
- 前記第2部分は、直線状にのびることを特徴とする請求項1~4の何れかに記載の空気入りタイヤ。
- 前記第2部分は、円弧状に湾曲することを特徴とする請求項1~4の何れかに記載の空気入りタイヤ。
- 前記ワイヤ巻重ね体において、ビードワイヤの巻き付け終端は、巻き付け始端とタイヤ回転軸芯CLとを通る半径方向線上に位置することを特徴とする請求項1~6の何れかに記載の空気入りタイヤ。
- 請求項1~7に記載の空気入りタイヤを形成するタイヤの製造方法であって、
中子の側面側のワイヤ貼付面上で、1本のビードワイヤを渦巻き状に複数回巻き重ねることによりワイヤ巻重ね体を形成する巻重ね体形成工程を具え、
前記巻重ね体形成工程は、前記ビードワイヤの巻付け始端を前記ワイヤ貼付面に押し付けて固着するワイヤ固着工程と、その後、前記中子をタイヤ回転軸芯CL回りで回転させることにより前記ビードワイヤを巻き付けるワイヤ巻重ね工程とを具えるとともに、
前記ワイヤ巻重ね工程では、
前記ビードワイヤの供給方向であるY軸方向とタイヤ回転軸芯CLとがなす角度α1を固定して前記中子Nを回転させる第1回転工程と、
前記角度α1を漸増させながら中子Nを回転させる第2回転工程とが交互に行われることを特徴とするタイヤの製造方法。 - 前記角度α1の漸増は、前記中子の赤道面とタイヤ回転軸芯CLとが交わる点Oを通る垂直な旋回軸心Ca回りで前記中子を旋回させることにより行われることを特徴とする請求項8記載のタイヤの製造方法。
- 前記第2回転工程では、前記角度α1の漸増とともに、中子を前記Y軸方向に移動させることを特徴とする請求項8又9記載のタイヤの製造方法。
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EP12857840.8A EP2767416B1 (en) | 2011-12-15 | 2012-11-22 | Pneumatic tyre and manufacturing method therefor |
BR112014014570-9A BR112014014570B1 (pt) | 2011-12-15 | 2012-11-22 | Pneumático e método para fabricação do mesmo |
US14/356,532 US20150053326A1 (en) | 2011-12-15 | 2012-11-22 | Pneumatic tyre and manufacturing method therefor |
JP2013549190A JP6034803B2 (ja) | 2011-12-15 | 2012-11-22 | タイヤの製造方法 |
CN201280062228.2A CN104010844B (zh) | 2011-12-15 | 2012-11-22 | 充气轮胎的制造方法 |
US15/631,507 US10894376B2 (en) | 2011-12-15 | 2017-06-23 | Pneumatic tire and manufacturing method therefor |
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US15/631,507 Division US10894376B2 (en) | 2011-12-15 | 2017-06-23 | Pneumatic tire and manufacturing method therefor |
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JP2014094684A (ja) * | 2012-11-09 | 2014-05-22 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ、及びその製造方法 |
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FR3030348B1 (fr) * | 2014-12-23 | 2017-06-23 | Michelin & Cie | Procede pour l'assemblage d'une ebauche de pneumatique |
JP7245632B2 (ja) * | 2018-10-31 | 2023-03-24 | 株式会社ブリヂストン | タイヤ |
FR3105097A1 (fr) | 2019-12-19 | 2021-06-25 | Compagnie Generale Des Etablissements Michelin | Pneumatique comprenant un bourrelet perfectionné |
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2012
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- 2012-11-22 CN CN201280062228.2A patent/CN104010844B/zh active Active
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EP2767416A1 (en) | 2014-08-20 |
CN104010844B (zh) | 2017-04-26 |
BR112014014570A2 (pt) | 2017-06-13 |
EP2767416A4 (en) | 2015-06-17 |
JP6034803B2 (ja) | 2016-11-30 |
EP2767416B1 (en) | 2017-11-15 |
JPWO2013088936A1 (ja) | 2015-04-27 |
US20170282473A1 (en) | 2017-10-05 |
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US20150053326A1 (en) | 2015-02-26 |
JP2016216044A (ja) | 2016-12-22 |
BR112014014570B1 (pt) | 2020-08-11 |
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US10894376B2 (en) | 2021-01-19 |
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