CN103635334B - For the method manufacturing bead member - Google Patents

Abstract

The present invention relates to the tire of a kind of reinforcement having and being formed by rubber strip and for the method manufacturing the bead member with bead core and reinforcement.In order to improve the durability of the reinforcement of the soft rubber including hard rubber that formed, that be arranged in radially inner side and radial outside by laminated latex bar, tire (1) is provided with bead core (2)；Reinforcement (3), it is arranged in the periphery of bead core (2)；And casingply (4).The end (4A) of casingply (4) is arranged on reinforcement (3).Reinforcement (3) includes being positioned at the inner rubber portion (3A) of radially inner side, the outer rubber portion (3B) being positioned at radial outside and cover strip (3C).Inner rubber portion (3A) is formed by stacking the first rubber strip (R1).Outer rubber portion (3B) is formed by stacking the second rubber strip (R2).Second rubber strip (R2) is made up less than the rubber of the hardness in inner rubber portion (3A) of hardness.Cover strip (3C) covers the part adjacent with the end of casingply (4) (4A) of reinforcement (3).

Description

For the method manufacturing bead member

Technical field

The present invention relates to a kind of method for manufacturing the bead member with bead core and reinforcement.

Background technology

Tire includes casingply and is arranged at the bead member of bead part.Bead member includes bead core Reinforcement with the periphery being formed at bead core.Casingply is turned back around bead core.Tire also includes The sidewall bent during travelling and deform.Owing to this flexure and deformation, the end of casingply May repeatedly stand big compression strain.If the end of casingply is positioned on reinforcement, deformation With effects of strain in this reinforcement.In order to tackle this problem, the reinforcement of tire well known in the prior art It is made up of two kinds of rubber, with Reducing distortion and strain (seeing patent documentation 1).

In conventional tire, reinforcement is by being positioned at the inner rubber portion of radially inner side and being positioned at radial outside Outer rubber portion composition.The hard reinforcement that inner rubber portion is made up of the rubber of high rigidity.Outside The soft reinforcement that rubber section is made up of the rubber of soft.Because hard inner rubber portion reduces on sidewall The flexure of portion's generation and deformation, so reducing the strain occurred in the end of casingply.Meanwhile, Soft outer rubber portion absorbs and reduces the strain transmitted.Because strain reduces, even if growing After the traveling of time, conventional tire also is able to the separation preventing occurring near the end of casingply.

Typically, by forming the reinforcement of bead member around the bead core wide extruded rubber of winding. By unvulcanized Rubber Extruder, extruded rubber is formed as reservation shape.There is the extrusion rubber of high rigidity Glue winds one layer around bead core, forms the inner rubber portion of reinforcement.There is the extruded rubber of soft Wind one layer around inner rubber portion, form the outer rubber portion of reinforcement.By using extruded rubber, Can reduce and form the time needed for reinforcement and effort, improve production efficiency.

But, when using extruded rubber, because the end of extruded rubber is engage, in the circumferential One formation junction surface, position.Additionally, the boundary between inner rubber portion and outer rubber portion is formed Another junction surface.As a result, the surface of reinforcement becomes concavo-convex.Thus, from increasing circumference further Circularity and balance from the viewpoint of, the reinforcement be made up of extruded rubber needs to be enhanced.Additionally, it is every The shape of secondary change reinforcement, hardware (sleeve of such as extruder) needs to be changed, when this can expend Between and expense.In order to overcome this problem, well known in the art by laminated latex bar (banding rubber Glue component) and form the method (seeing patent documentation 2) of reinforcement.

In the method, first, the unvulcanized rubber strip of stacking, form the first rubber strip.Then, tool The bead core having hexagonal cross-section is pressed against the first rubber component, makes bead core and the first rubber component become It is integrated.Then, stacking rubber strip on bead core and the first rubber component, form the second rubber component. That first rubber component is made up of identical rubber with the second rubber component and together with constitute reinforcement Inner rubber portion.Then, rubber strip is layered in inner rubber portion, forms the 3rd rubber component.The Three rubber components are made up of the rubber softer than the first and second rubber components, and constitute reinforcement Outer rubber portion.By being sequentially formed the first rubber component to the 3rd rubber component, reinforcement is made to be formed at Bead core.

By forming the reinforcement of rubber strip, reduce the concavo-convex of reinforcement, improve the circumference of reinforcement On circularity and balance.Furthermore it is possible to form variously-shaped reinforcement in the case of not changing hardware. But, the reinforcement being made up of rubber strip than the reinforcement being made up of extruded rubber more susceptible at carcass The above-mentioned deformation of the end generation of casing ply and the impact of strain.It is made up therefore, it is difficult to improve of rubber strip The reinforcement durability in the end of casingply, need to improve further durability.

Prior art literature

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 11-11118 publication

Patent documentation 2: Japanese Unexamined Patent Publication 2007-76233 publication

Summary of the invention

The problem that invention is to be solved

In view of the problems referred to above, make the present invention, it is an object of the present invention to improve the durability of reinforcement, This reinforcement has the hard rubber component and outside in footpath formed by laminated latex bar at radially inner side The soft rubber component that side is formed.

For solving the scheme of problem

The aspect of the present invention is a kind of tire, and described tire includes: pair of bead core；Reinforcement, described Reinforcement is arranged at the periphery of described bead core；And casingply, described casingply is arranged in Between the pair of bead core, the end of described casingply is arranged on described reinforcement.Described add Strong part has: is positioned at the inner rubber portion of radially inner side, forms described inner side by stacking the first rubber strip Rubber section；It is positioned at the outer rubber portion of radial outside, forms described outside rubber by stacking the second rubber strip Glue portion, described second rubber strip is by the low rubber group of the hardness of the rubber in inner rubber portion described in hardness ratio Become；And cover strip, described cover strip covers the ends contact with described casingply of described reinforcement Part.Described cover strip is low by the hardness of the rubber in inner rubber portion described in hardness ratio and than described outside rubber Rubber composition that the hardness of the rubber in glue portion is high, and described cover strip is arranged in the surface of described reinforcement Part with the ends contact of described casingply.

Another aspect of the present invention is a kind of method for manufacturing bead member, and described method is included in tire Circle core periphery formed reinforcement step, described reinforcement by be positioned at radially inner side inner rubber portion and The outer rubber portion being positioned at radial outside is formed, and the end of casingply is arranged in described reinforcement.Shape The step becoming reinforcement includes: by stacking the first rubber strip on stacking dish to form inner rubber portion The step of a part；Bead core is pressed against the step in this part of inner rubber portion of formation；By Compress on the first rubber strip of bead core and stacking dish stacking the first rubber strip further whole to be formed The step in inner rubber portion；In the whole inner rubber portion formed and stacking dish, by stacking the second rubber Adhesive tape forms the step in described outer rubber portion, inner rubber portion described in the hardness ratio of described second rubber strip The hardness of rubber low；And cover strip is arranged in described reinforcement surface with described casingply The part of ends contact, described cover strip low by the hardness of the rubber in inner rubber portion described in hardness ratio and The rubber composition higher than the hardness of the rubber in described outer rubber portion.

The effect of invention

The present invention can improve the durability of reinforcement, and this reinforcement has by laminated latex bar in footpath The hard rubber component formed to inner side and the soft rubber component formed at radial outside.

Accompanying drawing explanation

Fig. 1 is the sectional view of the bead part of the tire according to present embodiment.

Fig. 2 is the plane graph of the manufacture system manufacturing bead member according to present embodiment.

Fig. 3 is the side view of the amplification of stacking dish.

Fig. 4 is the axonometric chart of rubber strip extruder.

Fig. 5 illustrates the process manufacturing bead member.

Fig. 6 illustrates the process manufacturing bead member.

Detailed description of the invention

The tire of the present invention and the embodiment of the method for manufacture bead member will be described with reference to accompanying drawing.

The tire of present embodiment is the various for motor vehicle vehicle tyre including truck and bus.With Under, explanation will be given as examples with the pneumatic tire of truck or bus.

That this tire is made up of tyre element and there is known structure.Additionally, this tire has one To bead part, pair of sidewall portion and fetus face.Sidewall is positioned at the radial outside of bead part.Fetus face sets Put between this top to sidewall.Tire has belt and tread-rubber component at fetus face.

Fig. 1 is the sectional view of the bead part of the tire according to present embodiment.Fig. 1 is in the width side along tire To the surrounding of a bead part and bead part shown in the sectional view that (left and right directions in Fig. 1) intercepts Structure.Another tyre bead portion is in the right side of the bead part shown in Fig. 1.

Tire 1 includes a pair ring-type bead core 2, reinforcement 3 and casingply 4.Tire 1 also includes cloth Put bead member at bead part 56 one of each centering (Fig. 1 only illustrate).

Bead core 2 is arranged on bead part 5 and along tire circumferentially.Bead core 2 has polygon Cross section (being hexagonal cross-section in Fig. 1), this polygonal cross-section has five or more a plurality of limit.Reinforcement 3 For being arranged on the rubber component of the periphery of bead core 2.Reinforcement 3 is ring-type and is arranged in bead core 2 Radial outside.Reinforcement 3 has the cross sectional shape narrowed outside bead core 2 is radially oriented.Bead member 6 tyre elements being made up of bead core 2 and reinforcement 3.

Casingply 4 is made up of multiple cord (not shown) and covering rubber, and with ring-type Mode be arranged in this to bead core 2 between.Additionally, at bead part 5, casingply 4 is arranged in The surface of bead member 6, by the inner side on the tire width direction of bead member 6 and around bead core 2 turn back.The casingply 4 outside on the tire width direction of bead member 6, from the radial direction of tire On the outside that is radially oriented, inner side extend.The end 4A of casingply 4 is (in present embodiment Return portion) it is arranged in the surface of reinforcement 3.

Reinforcement 3 includes being positioned at the inner rubber portion 3A of radially inner side, being positioned at the outer rubber of radial outside Portion 3B and cover strip (cover tape) 3C.Inner rubber portion 3A is formed by stacking the first rubber strip R1. Outer rubber portion 3B is formed by stacking the second rubber strip R2.Second rubber strip R2 is less than interior by hardness The rubber composition of the hardness of side rubber section 3A.

In FIG, a cross section and second rubber strip of the first rubber strip R1 are shown the most substantially One cross section of R2.By by the first rubber strip R1 and the second rubber strip R2 with multilamellar (not shown) Mode stacking and form inner rubber portion 3A and outer rubber portion 3B.More specifically, the first rubber strip R1 Strip (or banding) rubber component being made up of unvulcanized rubber with the second rubber strip R2, at non-sulfur When the tire changed cures, this strip rubber component cures.

Inner rubber portion 3A is formed at the radial outside (on periphery) of bead core 2, and has triangular-section, And it is arranged between bead core 2 and outer rubber portion 3B.Inner rubber portion 3A is by hardness ratio the second rubber The hard rubber composition that the hardness of adhesive tape R2 and outer rubber portion 3B is high.It is, inner rubber portion 3A For hard rubber portion (hard reinforcement) and the radial inside portion that constitutes reinforcement 3.Outer rubber portion 3B It is formed on inner rubber portion 3A, and there is narrow triangular-section, and with from inner rubber portion 3A The mode being radially oriented outside extension is arranged.The soft rubber portion that outer rubber portion 3B is made up of soft rubber (soft reinforcement) and constitute the radial outside portion of reinforcement 3, hardness ratio first rubber in soft rubber portion The hardness of adhesive tape R1 and inner rubber portion 3A is low.

Cover strip 3C is to strengthen component, and it covers the inner rubber portion 3A and outer rubber portion 3B of reinforcement 3, To strengthen the part adjacent with the end 4A of casingply 4 of reinforcement 3, cover strip 3C is arranged in reinforcement Outer surface on the tire width direction of part 3.The banding rubber that cover strip 3C is made up of unvulcanized rubber Component (rubber strip), and cover strip 3C cures when vulcanizing unvulcanized tire.Cover strip 3C The width of width ratio rubber strip R1 and R2 big so that cover strip 3C can cover the inner rubber of reinforcement 3 Portion 3A and the specific part of outer rubber portion 3B.Here, cover strip 3C is by hardness ratio inner rubber portion The rubber composition that low and than outer rubber portion 3B the hardness of the hardness of 3A is high.Cover strip 3C is formed as having Preset width and thickness, and be circumferentially positioned on reinforcement 3.Thus, ring-type cover strip 3C is with as follows Mode is formed at a part for reinforcement 3: ring-type cover strip 3C is to fill up the step between rubber strip R1 and R2 Mode cover the part on surface of reinforcement 3.

The part that the end 4A with casingply 4 on the surface that cover strip 3C covers reinforcement 3 contacts.More Specifically, cover strip 3C is arranged in (example at the periphery comprising the part contacted with end A of reinforcement 3 Such as the part contacted with end 4A and the periphery of this part) or it is arranged in the part contacted with end 4A In, cover strip 3C covers the part surface contacted with end 4A of reinforcement 3 or whole surface.Additionally, lid Radial outside end T1 with 3C is positioned at the radial outside of the end 4A of casingply 4, i.e. carcass ply The radial outside on the top (radial outside end) of layer 4, to strengthen the end 4A of casingply 4.Additionally, The radially inner side end T2 of cover strip 3C in the part contacted with the end 4A of casingply 4, be positioned at The radially inner side of radial outside end (circumferential position) S of side rubber section 3A.

Then, explanation is manufactured the manufacture system (hereinafter referred to as " manufacture system ") of bead member 6. Manufacture system manufacture is used for producing the unvulcanized bead member 6 of unvulcanized tire.

Fig. 2 is the plane graph of the manufacture system 10 according to present embodiment.Fig. 2 schematically shows manufacture system The general structure of system 10.

As in figure 2 it is shown, manufacture system 10 includes controlling to put 11, for forming the forming device of reinforcement 3 20, robot 12, for storing the storage part 13 of bead core 2 and for storing the storage part of bead member 6 14.Manufacture equipment 10 also includes the first extruder 30A, the second extruder 30B and for being attached cover strip The attachment arrangement 50 of 3C.Control put 11 control whole manufacture system 10 and perform to form bead member 6 Process.

Forming device 20 includes that two disc-like layers disc stack 21 and driving put 22.Stacking dish 21 is respectively provided with Lamination surface 21A, lamination surface 21A is formed as ring plain shape.Rubber strip R1 and R2 (not shown in Fig. 2) It is laminated in lamination surface 21A of stacking dish 21.Bead member 6 is formed at stacking dish 21.Two stacking dishes 21 are attached to driving the position of away from each other 180 degree puts 22.Driving is put 22 and is put via rotation (not shown) rotates stacking dish 21 at a predetermined velocity.Additionally, driving is put 22 and is put (not by pivot Illustrate) pivot around pivotal axis 23.Stacking dish 21 pivots together with putting 22 with driving.22 bags are put in driving The temperature regulation including the temperature for regulating course disc stack 21 puts (not shown) and for making bead member The 6 separating mechanism (not shown) separated with stacking dish 21.

The B of A and Fig. 3 of Fig. 3 is the enlarged side view of stacking dish 21.Also show in the B of A and Fig. 3 of Fig. 3 Go out the cross section of bead core 2.

Forming device 20 includes the holding means 24 for keeping bead core 2.Each holding means 24 is arranged on The center of stacking dish 21, and include multiple movable links 25 of cylindric configuration, retainer 26 and for Travel mechanism's (not shown) of mobile movable link 25.Multiple movable link 25 footpath is made by travel mechanism Move to ground.More specifically, multiple movable links 25 are moved radially outward to keep bead core 2, multiple Movable link 25 moves radially inwardly to discharge bead core 2.

In the end of multiple movable links 25 by holding means 24 from inner side holding bead core 2.Retainer 26 (seeing the A of Fig. 3) are attached to multiple movable link 25 with bead core 2 in the way of contacting.By only Moving part 26 supports bead core 2 from side.Stacking dish 21 has the insertion section 21B inserted for holding means 24. Holding means 24 is moved relative to stacking dish 21 by shift mechanism (not shown), and is inserted into slotting Enter in portion 21B (seeing the B of Fig. 3).Bead core 2 is compressed against stacking dish 21 by holding means 24.When By bead member 6 when holding means 24 and stacking dish 21 transfer to another location, move from movable link 25 Except retainer 26, movable link 25 moves radially inwardly.

Bead core 2 is stored in storage part 13 and (sees Fig. 2).The bead member 6 produced is stored in On pallet (pallet) 14A of storage part 14.Storage part 14 is to have the multiple pallet 14A vertically stacked Coaster (wagon).Storage part 13 and storage part 14 are positioned near robot 12.Robot 12 is to have The industrial robot of multiple arms.Robot 12 picks up bead core 2 from storage part 13 and is placed by bead core 2 In holding means 24.Robot 12 also removes bead member 6 from stacking dish 21, and by this tyre bead structure Part 6 is placed on pallet 14A.Now, driving is made to put 22 pivots so that stacking dish 21 is positioned at robot The job position (anterior position) of 12.The bead member 6 so manufactured is stored in storage part 14.

First extruder 30A and the second extruder 30B is installed in the side of forming device 20.In other words, Forming device 20 is between the first extruder 30A and the second extruder 30B.First extruder 30A and Two extruder 30B are respectively facing forming device 20 extruded rubber bar R1 and rubber strip R2.Now, driving is made Put 22 pivots stacking dish 21 to be positioned at the first extruder 30A and the front of the second extruder 30B. First extruder 30A and the second extruder 30B will be from rubber feedway 15A and rubber feedway 15B Different types of half finished rubber of supply is extruded as the rubber component with predetermined cross-sectional respectively.First squeezes Go out machine 30A to extrude the first rubber strip R1, the second extruder 30B and extrude the second rubber strip R2.Rubber strip R1 It is laminated on stacking dish 21 with R2.

Fig. 4 is the axonometric chart of the extruder 30 (30A, 30B) for extruded rubber bar R (R1, R2).

As shown in Figure 4, extruder 30 includes hopper 31, main body 32, gear pump 33, sleeve 34, a pair Stacking roller 35 and 36 and mobile parts 40.From hopper 31, unvulcanized rubber is supplied to main body 32, And in main body 32, mediate unvulcanized rubber by rotating screw rod (not shown).Main body 32 passes through spiral shell Unvulcanized rubber is supplied in gear pump 33 by bar, and gear pump 33 is keeping the unvulcanized rubber of discharge Amount constant while discharge unvulcanized rubber continuously.Set from the outlet being attached to gear pump 33 The opening of cylinder 34 extrudes unvulcanized rubber, and is formed as predetermined cross-sectional shape.Thus, formed by not The rubber strip R of the rubber composition of sulfuration.Extruder 30 is from sleeve 34 extruded rubber bar R continuously.

Supported by support member 37,38 and be fixed to a pair stacking roller 35 and 36 of sleeve 34 and be arranged in set The front of cylinder 34, and put (not shown) by driving and rotate in opposite direction.Rubber strip R leads to Cross between a pair stacking roller 35 and 36, and be laminated on stacking dish 21 by stacking roller 36.Now, Stacking dish 21 rotates with the speed corresponding with the stacking speed of rubber strip R.Rubber strip R is pressed by stacking roller 36 To stacking dish 21, thus rubber strip R is attached to the component on stacking dish 21 or stacking dish 21.Rubber strip R rotates along with stacking dish 21 and is circumferentially arranged on stacking dish 21.Stacking roller 36 layer in the way of multilamellar Folded rubber strip R.

Extruder 30 is arranged in the top of mobile parts 40 and is moved by mobile parts 40.Mobile parts 40 include the first travel mechanism 41 to the 3rd travel mechanism 43 and for making travel mechanism 41 to 43 move Driving put (not shown).First travel mechanism 41 and the second travel mechanism 42 have by wheel 41A Mobile station 41B moved with 42A and 42B.First travel mechanism 41 is at the direction (X of the axis of stacking dish 21 Direction) upper mobile extruder 30.In the first travel mechanism 41, the second travel mechanism 42 of movement is vertically The upper mobile extruder 30 of horizontal direction (Y-direction) in X-direction.

3rd travel mechanism 43 includes two tracks 44 and 45, two wheels 46 and 47 and two connection structures Part 48 and 49.Track 44 and 45 has arc-shaped and is fixed to the top of the second travel mechanism 42.Even Wheel 46 and 47 is connected to main body 32 by connection member 48 and 49.3rd travel mechanism 43 is on track 44 and 45 Mobile wheel 46 and 47, causes extruder 30 to pivot.Extruder 30 around stacking roller 36 and stacking dish 21 it Between contact point be pivoted up in the side shown in arrow W.

Extruder 30 is moved to by mobile parts 40 by the first travel mechanism 41 and the second travel mechanism 42 Optional position on horizontal plane (X/Y plane), makes extruder 30 pivot by the 3rd travel mechanism 43 simultaneously Turn.Thus, extruder 30 changes position and the angle of the rubber strip R treating stacking.Rubber strip R is by squeezing Go out machine 30 to be layered on the stacking dish 21 of rotation with predetermined pattern.Extruder 30 laminated latex bar R continuously And on stacking dish 21, form ring-shaped rubber component.The ring-shaped rubber structure formed by laminated latex bar R Part has predetermined cross-sectional shape.When rubber strip R is stacked, backer roll (press bonding roller (stitcher)) is (not Illustrate) it is compressed against rubber strip R.

Attachment arrangement 50 (seeing Fig. 2) is positioned at the side of the second extruder 30B, and include roller 51, can The attachment roller 52 rotated and mobile station 53.Cover strip 3C is positioned in by setting after being formed by unvulcanized rubber On the banding liner 54 that fat (such as polyethylene) forms.Roller 51 batches cover strip 3C and liner 54, and And be supplied to be attached roller 52 from roller 51 by cover strip 3C and liner 54.Mobile station 53 moves whole attachment arrangement 50.Thus, the rubber (reinforcement 3) that attachment roller 52 is compressed against on stacking dish 21.

Cover strip 3C is compressed the predetermined portions of reinforcement 3 by attachment roller 52, makes a reservation for so that cover strip 3C is attached to this Part.Cover strip 3C rotates along with stacking dish 21 and is circumferentially arranged on reinforcement 3.Liner 54 and cover strip 3C separates and is attached device 50 and reclaims.Once cover strip 3C is arranged on reinforcement 3 one week, stacking dish The rotation of 21 stops, and cut component (not shown) cuts off cover strip 3C.Thus, cover strip 3C is joined annularly Put on reinforcement 3.

It follows that explanation to be manufactured the process of tire bead component 6 (seeing Fig. 1).Manufacture system 10 (ginseng See Fig. 2) manufacture bead member 6 by formation reinforcement 3 on the periphery of bead core 2, reinforcement 3 has There is inner rubber portion 3A and outer rubber portion 3B.At this moment, first, bead core 2 is placed on layer by robot In the holding means 24 of disc stack 21.When keeping bead core 2 by holding means 24, make driving Put 22 pivots stacking dish 21 to be positioned at the front of the first extruder 30A.

The C of the A to Fig. 6 of D and Fig. 6 of the A to Fig. 5 of Fig. 5 illustrates the process manufacturing bead member 6.Fig. 5 The C of A to Fig. 6 of D and Fig. 6 of A to Fig. 5 be the side view of stacking dish 21.Bead member 6 is shown The sectional view of each several part.The C of Fig. 6 illustrates a cross section of bead member 6 in the way to enlarge.

Bead core 2 (seeing the A of Fig. 5) is arranged in the position leaving stacking dish 21.In this condition, layer Disc stack 21 rotates, and the first extruder 30A starts to be layered on stacking dish 21 first rubber strip R1.Pass through Stacking the first rubber strip R1 on stacking dish 21, forms the inner rubber of the radially inner side being positioned at reinforcement 3 Portion 3A.When forming inner rubber portion 3A, first stacking the first rubber strip R1 is with shape on stacking dish 21 Become a part of 3A1 (seeing the B of Fig. 5) of inner rubber portion 3A.This part 3A1 is inner rubber portion 3A Radial inside portion and contact with the periphery of bead core 2.

It follows that bead core 2 (seeing the C of Fig. 5) is pressed against stacking dish 21 He by holding means 24 Part 3A1 of inner rubber portion 3A, thus bead core 2 be attached to inner rubber portion 3A inner circumferential and It is positioned in part 3A1 of inner side rubber section 3A.After being attached bead core 2, the first extruder 30A Again the first rubber strip R1 is layered on part 3A1 and the stacking dish 21 of inner rubber portion 3A, to be formed Part 3A2 of inner rubber portion 3A.It is thusly-formed whole inner rubber portion 3A (seeing the D of Fig. 5). By this way, in the midway forming inner rubber portion 3A, bead core 2 is placed on inner rubber portion 3A, Define part 3A2 of the radial outside of inner rubber portion 3A, so complete the layer of inner rubber portion 3A Folded.The first rubber strip R1 is cut off by cut component (not shown).

Pivot it follows that make driving put 22 (seeing Fig. 2) so that stacking dish 21 is positioned at the second extrusion The front of machine 30B.Then, stacking dish 21 rotates, and the second extruder 30B starts stacking the second rubber strip R2.As it has been described above, the second rubber strip R2 rubber group that to be the hardness by hardness ratio inner rubber portion 3A low Become.By stacking the second rubber strip R2, form the outer rubber portion of the radial outside being positioned at reinforcement 3 3B (sees the A of Fig. 6).Second rubber strip R2 is layered on inner rubber portion 3A and stacking dish 21, complete After becoming stacking, cut off the second rubber strip R2 by cut component (not shown).

It follows that be attached to be formed as one week by cover strip 3C (seeing the B of Fig. 6) by attachment arrangement 50 Reinforcement 3.Cover strip 3C is arranged in part 3D that the end 4A with casingply 4 of reinforcement 3 contacts On, and cover inner rubber portion 3A and the specific part of outer rubber portion 3B of reinforcement 3.By entering The above-mentioned process of row, manufacture system 10 has manufactured the end 4A of casingply 4 and has been arranged in the tire on reinforcement 3 Circle component 6 (seeing the C of Fig. 6).Tyre bead structure is removed from stacking dish 21 by robot 12 (seeing Fig. 2) Part 6 and bead member 6 is stored in storage part 14.

Manufacture system 10 uses the first extruder 30A and the second extruder 30B by rubber strip R1 and R2 simultaneously It is layered in respectively on corresponding stacking dish 21.In other words, manufacture system 10 and manufacture two bead member simultaneously 6.Bead member 6 after being manufactured by detection device (not shown) detection.Carried out by detection device Detection during, by laser measuring device for measuring (not shown) measure bead member 6 cross section, based on The net shape of the cross section detection bead member 6 measured.More specifically, by the cross section by bead member 6 Compare with reference figure, it is determined that the quality of bead member 6.Alternatively, by the cross section by bead member 6 Size and reference dimension compare, it is determined that the quality of bead member 6.

As it has been described above, in the present embodiment, do not have because being formed by laminated latex bar R1 and R2 There is the reinforcement 3 of bonding part, it is possible to reduce surface concavo-convex of reinforcement 3, it is possible to increase reinforcement 3 Circumferential direction on circularity and balance.By changing the program of manufacture system 10, it is possible to manufacture variously-shaped Reinforcement 3.Because which eliminating the demand changing hardware, it is possible to reduce time and expense.

Because contacting by cover strip 3C being arranged in the end 4A with casingply 4 on reinforcement 3 surface Part and reinforcement 3 can be strengthened, therefore, it is possible to improve reinforcement 3 durability.Because passing through carcass The end 4A of casing ply 4 can improve the durability of reinforcement 3, therefore, it is possible to prevent near the 4A of end Position occur in reinforcement 3, owing to deformation and strain separation.If by stacking rubber Adhesive tape R forms the whole reinforcement 3 including cover strip 3C, then the production efficiency of reinforcement 3 will be low.Phase Instead, by substitutable layer imbrication band 3C, cover strip 3C is configured to a part for reinforcement 3, it is possible to increase The production efficiency of reinforcement 3.

According to the cross sectional shape of bead core 2, between bead core 2 and stacking dish 21, produce gap.Especially, When bead core 2 has the polygonal cross-section comprising five or more a plurality of limit, bead core 2 and stacking dish 21 it Between gap little.Stacking the first rubber strip R1 it is difficult in this small-gap suture.But, in the present embodiment, Because after forming part 3A1 of inner rubber portion 3A, bead core 2 is placed on inner rubber portion 3A Part 3A1 at, inner rubber portion 3A can be formed in the gap between bead core 2 and stacking dish 21. Therefore, it is possible to positively, be securely engaged bead core 2 and inner rubber portion 3A.

The radial outside end T1 of cover strip 3C needs to be positioned at the radial outside of the end 4A of casingply 4, To strengthen the end 4A of casingply 4.Additionally, cover strip 3C radially inner side end T2 need with tire In the part of the end 4A contact of body casing ply 4, it is positioned at the radial outside end S of inner rubber portion 3A Radially inner side.

By extruder extrude cover strip 3C, cover strip 3C is placed on liner 54, the most at room temperature by It is arranged on reinforcement 3.Alternately, cover strip 3C can be higher than room while being extruded machine extrusion It is arranged on reinforcement 3 under the predetermined temperature of temperature.Preferably, cover strip 3C has the width of 38mm～50mm Degree and the thickness of 0.7mm～1.0mm.Preferably, bead core 2 has hexagonal cross-section.

Description of reference numerals

1 tire

2 bead cores

3 reinforcements

3A inner rubber portion

3B outer rubber portion

3C cover strip

4 casingplies

4A end

5 bead part

6 bead member

10 manufacture system

11 control to put

12 robots

13 storage parts

14 storage parts

15 rubber feedwaies

20 forming devices

21 stacking dishes

21A lamination surface

21B insertion section

22 drivings are put

23 pivotal axis

24 holding meanss

25 movable links

26 retainers

30 extruders

31 hoppers

32 main parts

33 gear pumps

34 sleeves

35,36 stacking roller

37,38 supporting member

40 move parts

41～43 travel mechanisms

44,45 track

46,47 wheel

48,49 connecting elements

50 attachment arrangements

51 rollers

52 attachment rollers

53 mobile stations

54 liners

R1 the first rubber strip

R2 the second rubber strip

Claims (3)

1., for the method manufacturing bead member, described method is included in the periphery formation of bead core and adds The step of strong part, described reinforcement includes the inner rubber portion being positioned at radially inner side and is positioned at radial outside Outer rubber portion and cover strip, the end of casingply is arranged in described reinforcement,

Wherein, the step forming reinforcement includes: by stacking the first rubber strip on stacking dish to be formed The step of the part in inner rubber portion；Bead core is pressed against this part of inner rubber portion of formation Step；By stacking the first rubber strip further on the first rubber strip compressing bead core and stacking dish To form the step in whole inner rubber portion；In the whole inner rubber portion formed and stacking dish, pass through Stacking the second rubber strip forms the step in described outer rubber portion, described in the hardness ratio of described second rubber strip The hardness of the rubber in inner rubber portion is low；And described cover strip is arranged in described reinforcement surface with The part of the ends contact of described casingply, described cover strip is by the rubber in inner rubber portion described in hardness ratio The rubber composition that the hardness of glue is low and higher than the hardness of the rubber in described outer rubber portion.

Method for manufacturing bead member the most according to claim 1, it is characterised in that

The step of the part forming inner rubber portion includes:

Bead core is arranged in the way of leaving stacking dish the step of the holding means of stacking dish；And

By holding means, bead core is pressed against the step in this part of inner rubber portion of formation.

Method for manufacturing bead member the most according to claim 1 and 2, it is characterised in that

The radial outside end of described cover strip is positioned at the radial outside of the end of described casingply, and

The radially inner side end of described cover strip with in the part of the ends contact of described casingply, position Radially inner side in the radial outside end in described inner rubber portion.