CN100488761C - Method for manufacturing a pneumatic tire and a pneumatic tire obtained thereby - Google Patents
Method for manufacturing a pneumatic tire and a pneumatic tire obtained thereby Download PDFInfo
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- CN100488761C CN100488761C CNB2005100903447A CN200510090344A CN100488761C CN 100488761 C CN100488761 C CN 100488761C CN B2005100903447 A CNB2005100903447 A CN B2005100903447A CN 200510090344 A CN200510090344 A CN 200510090344A CN 100488761 C CN100488761 C CN 100488761C
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Abstract
It is a subject to provide a method for manufacturing a tire rubber member and a pneumatic tire using the same capable of improving productivity and of accurately finishing sectional shapes. The method includes: a step of fixedly attaching winding start points 8As, 8Bs of a first rubber strip 8A and a second rubber strip 8B at positions located further inside in a width direction than respective sides e1, e2 of a rubber member R; a first winding step of forming a first layer 10 by spirally winding the first rubber strip 8A towards the one side e1 and the second rubber strip 8B towards the other side e2 up to the respective sides e1, e2; a second winding step of respectively turning the first rubber strip 8A up at the one side e1 and the second rubber strip 8B at the other side e2 so as to successively form a second layer 11 outside of the first layer 10; and a step of fixedly attaching a winding end point 8Af of the first rubber strip and a winding end point 8Bf of the second rubber strip to positions further inside in the width direction than the respective sides e1, e2.
Description
Technical field
The present invention relates to make the airtyred method of the rubber assembly that comprises accurate shape of cross section, utilize this method to boost productivity, also relate to the pneumatic tire that makes thus.
Background technology
Recently, the someone proposes a kind of band shown in Figure 14-16 and twines method (strip wind method).In this band winding method, banded half finished rubber bar g is twined and formation winding body around institute's object c spiral that twines.Sulfidization molding uses the crude tyre of this winding body.Like this, described winding body can comprise the rubber for tire assembly, as tread rubber tr.This band twines method at for example Japan Patent No.3, proposes in 477,289, Japan Patent No.3,352,045, Japan Patent No.3,370,282 and Japan Patent No.3,397,430.Rubber strip g twines the object c that twines on it and columniformly is retractable into pattern or at the tread portion of the crude tyre under the situation of green tire body winding of strips layer.
In this band winding method, the rubber assembly of arbitrary section shape can form by changing the winding pitch of twining in the overlapping rubber strip.Therefore, can economize the slightly extruding dies and the operation of changing these mouthfuls mould of each tire preparation certain cross sectional, can expect therefore and boost productivity that this is different from traditional whole extrusion molding.
Figure 13-16 explanation is as several cross section examples of the green tread rubber tr of the conventional tire rubber assembly that forms tread rubber.Figure 13 explanation is twined method whole whole extruded product tr1 that extrudes from extruder by non-band.
Utilize band to twine method, produced all tread rubbers as shown in Figure 14-16.Twine to the direction spiral of another lateral margin e2 from a lateral margin e1 by single continuous rubber strip g being centered on the cylinder c edge of being twined, form the tread rubber tr2 among Figure 14.Tread rubber tr3 among Figure 15 uses two independently rubber strip g1, g2.A rubber strip g1 and another root rubber strip g2 are twined to center convolution from a lateral margin e1 and another lateral margin e2 respectively.Each twines terminal point f1, f2 and is located substantially on middle body (width middle body) on the width.In Figure 14 and 15,, schematically illustrate and form spaced rubber strip g therebetween for ease of understanding.
Tread rubber tr4 among Figure 16 uses two separate rubber strip g1, g2.Respectively a rubber strip g1 is twined to a side e1 from the width middle body of tread rubber tr4, another root rubber strip g2 twines to opposite side e2 from the width middle body.
Like this tread rubber tr that obtains by traditional band winding method arrange shown in Figure 17 as the plane, the winding starting point s of rubber strip g and/or twine terminal point f and be positioned at lateral margin e1, the e2 that twines body wherein.Therefore, easily at the winding starting point s of end face and abutting rubber bar g with twine between the rubber strip lateral margin at terminal point f place, generation comprises the situation of the stepped discontinuous part k at turning during along viewed in plan.This discontinuous part k causes tread rubber tr cross section in the tire circumferential direction uneven defective that becomes, thereby makes the tire uniformity variation.
The winding starting point s of rubber strip g and winding terminal point f peel off than the remainder of rubber strip is easier.Therefore, when these points were positioned at the lateral margin position of tread rubber etc., the cracked defective of crack or rubber just appearred in sulfuration back easily at those positions.
On the other hand, also have situation as shown in figure 18, wherein rubber strip g broad ways is twined a circle from a lateral margin to another lateral margin spiral, and this is similar to the situation among Figure 14.Twine in the body at this, it will be very little that the spiral of rubber strip g twines pitch P, to obtain enough thickness.Therefore, during winding, rubber strip g tilts substantially.Radially, between the outward flange o of rubber strip g and inward flange i, produce big difference.As a result, during winding, rubber strip g tends to by the big outward flange o traction of peripheral speed.Be difficult to twine rubber strip g in accurate mode at ad-hoc location.Because these facts cause being difficult to regulate the thickness (specification) of tread rubber tr each several part, so in said method, occur the irregular of cross sectional shape easily.
With regard to Figure 18, tread rubber tr is arranged as the winding starting point s of rubber strip g on tire axial and twines the end that terminal point f is positioned at tread rubber tr.Therefore, the specification of tread rubber tr end will become inhomogeneous on tire circumferential direction.Because in the cross sectional shape that tread rubber tr is had, the thickness of tread rubber tr reduces from inside to outside gradually along tire axial, so the irregular of place, tread rubber end specification will influence uniformity and other factors to a great extent.
With reference to specific embodiment, when forming 3mm thickness part and 2mm thickness part at the place, tread rubber tr end with little thickness, the degree of irregularity of this specification will reach 33%.Yet when forming 10mm thickness part and 9mm thickness part in the tread rubber tr central portion office with big thickness, the middle body degree of irregularity will be 10%, therefore will be less for inhomogeneity influence.
The inhomogeneities of tread rubber tr end (winding end of body) specification is unwelcome, because they make the remarkable variation of homogeneity of tire, and the durability of reduction tire.
Summary of the invention
An object of the present invention is to provide the airtyred method of a kind of manufacturing, and show the more pneumatic tire of high production rate, homogeneity and durability by winding starting point that limits rubber strip and the position of twining terminal point.
Another object of the present invention provides the airtyred method of a kind of manufacturing, and the pneumatic tire that when improving tread rubber productivity ratio, is enough to accurately process cross sectional shape, it twines from interior side direction side edge portions spiral on width based on rubber strip, and the arrangement of turning back towards middle body in the side edge part office under situation about not cutting off.
The present invention is the airtyred method of a kind of manufacturing, is used to make the pneumatic tire that comprises the rubber for tire assembly, and the annular that the utilization of described rubber for tire assembly obtains by winding of band-type unvulcanized rubber bar is in a spiral manner twined body and formed, and this method comprises:
At the width inner side place of twining each lateral margin of body, the winding starting point of the winding starting point of first rubber strip and second rubber strip is fixedly attached to the step on the object of twining,
By first rubber strip is wound to this lateral margin to a lateral margin spiral, and second rubber strip be wound to this another lateral margin to another lateral margin spiral and form first winding step of ground floor,
By at a lateral margin place first rubber strip being turned back and it being twined and do not block to another lateral margin spiral, and at another lateral margin place second rubber strip turned back and it is twined and do not block to a lateral margin spiral, and form continuously in the ground floor outside second layer second winding step and
The winding terminal point of the winding terminal point of first rubber strip and second rubber strip is fixedly attached to the step at the width inner side place of each lateral margin.
Like this, method of the present invention is included in the width inner side place of twining each lateral margin of body (rubber for tire assembly), makes the winding starting point of the winding starting point of first rubber strip and second rubber strip be fixedly attached to the step on the object of twining.Like this, the winding of each rubber strip works the lateral margin place that names a person for a particular job and can not be positioned at rubber assembly.
By first winding step that comprises above-mentioned arrangement and second winding step that forms the second layer in the ground floor outside that obtains by this step continuously, can effectively form the rubber assembly of big thickness at short notice.
According to the present invention, the winding terminal point of the winding terminal point of first rubber strip and second rubber strip is fixedly attached to the step at the width inner side place of each lateral margin.Therefore, the winding terminal point of rubber strip also will can not be positioned at the lateral margin place of rubber assembly.Therefore, the rubber for tire assembly that makes according to the present invention can improve the homogeneity of tire and the durability of rubber assembly.
According to the present invention, can make the winding starting point of first and second rubber strips be positioned at the width middle body that twines body.Also can make the winding terminal point of first and second rubber strips be positioned at the width middle body that twines body.
Winding starting point and terminal point at rubber strip are positioned under the situation of width middle body, are easy to make the tread rubber width specification homogenization everywhere of the end that comprises on the width.Therefore, can easily make the compared with prior art pneumatic tire of homogeneity raising.
In addition, theme of the present invention provides the pneumatic tire that is made by the airtyred method of above-mentioned manufacturing, and the pneumatic tire with the favourable productivity ratio that can improve tire uniformity and rubber assembly durability is provided.
Description of drawings
Fig. 1 is the perspective view that used being used for forms the device of rubber assembly in explanation the inventive method;
Fig. 2 is the schematic diagram of its side of explanation;
Fig. 3 is the perspective view of explanation rubber strip;
Fig. 4 (A)-4 (E) is that the cross-sectional that body forms step is twined in explanation;
Fig. 5 (A)-5 (C) is the sketch of three rubber strip winding path embodiment of explanation;
Fig. 6 (A) is the sectional view that illustrates when providing bottom, and Fig. 6 (B) is the sectional view that illustrates when providing bottom and intermediate layer;
Fig. 7 is that explanation comprises that the tread rubber in bottom and intermediate layer twines the sectional view of another embodiment of body;
Fig. 8 (A)-8 (D) is the sectional view that explanation bottom and intermediate layer form step;
Fig. 9 is the air tread enlarged drawing of making according to the inventive method partly;
Figure 10 (A) is the sectional view of X position among Fig. 4 (E), and Figure 10 (B) is the diagrammatic cross-sectional view of Y position in the key diagram 4 (E);
Figure 11 (A)-11 (C) is the sectional view that the explanation tread rubber twines other formation steps of body;
Figure 12 is the enlarged drawing according to another tread portion of pneumatic tire of the inventive method manufacturing;
Figure 13 is that explanation is by extruding the sectional view of the tread rubber of formation according to the integral body of prior art;
Figure 14 illustrates that the tread rubber that makes by traditional band winding method twines the sectional view of body;
Figure 15 is the sectional view that another winding body of tread rubber that makes by traditional band winding method is described;
Figure 16 is the sectional view that the another winding body of tread rubber that makes by traditional band winding method is described;
Figure 17 is that the traditional tread rubber of explanation twines the plane of the winding of body; With
Figure 18 is the sectional view that another winding body of tread rubber that makes by the winding step consistent with Figure 14 is described.
The specific embodiment
Now will be based on description of drawings embodiment of the present invention.
Fig. 1 explanation is in airtyred method constructed in accordance, and moulding is used to form the shaped device 1 of the winding body of rubber for tire assembly.Configuration shaped device 1 makes it comprise pedestal 2, is supported on rotatable cylindric shaping mould 3 on the pedestal 2 and can be to the loader 4 of shaping mould 3 supply rubber strips 8.
For example, each of adjacency radially moved inward plates 3A, change their interior locations radially simultaneously mutually.Like this, molded surface U can shrink on diametric(al), and can the phase mutual interference.This is enough to make the rubber assembly that is wrapped on the molded surface U to separate with shaping mould 3.And, because expansion/contraction mechanical device 6 secure bond are in rotating shaft 7, so the speed rotation that shaping mould 3 can rotating shaft 7 and stopping.Utilize the controller (not shown) that contracted diameter and the shaping mould 3 of plates 3A are suitably adjusted.
Each loader 4 is formed transport portion, and banded half finished rubber bar 8 supplies to the molded surface U of shaping mould 3 through its feed surface.At the upstream side of loader 4, provide the Rubber Extruder that is used for continuous extruded rubber bar 8 or calender (the two is all not shown) and peg that can Instantaneous Control rubber strip feed speed.By utilizing for example three-dimensional mobile device (not shown) to support, to provide loader 4 with respect to shaping mould 3 suitable removable modes.
Shaped device 1 also comprises the first loader 4A and the second loader 4B, and move vertically and along circumferential its position.The first loader 4A can supply with the first rubber strip 8A continuously to shaping mould 3.The second loader 4B can be independent of first rubber strip and supply with the second rubber strip 8B continuously to shaping mould 3.
At this, rubber strip 8 is banded, and the cross section is rectangular basically, has the big width W with respect to its thickness t simultaneously, for example shown in Fig. 3.When being not particularly limited, the width W of rubber strip 8 is preferably 15-35mm.When thickness t is not particularly limited, be preferably 0.5-1.5mm.Less than 15mm or thickness t under the situation less than 0.5mm, when twining by spiral when forming rubber assembly, the winding number of turns of rubber strip 8 increases, and causes productivity ratio to reduce in the width W of rubber strip 8.On the other hand, when width W surpasses 35mm or thickness t and surpasses 1.5mm, will be difficult to form accurate cross sectional shape.In the present embodiment, use to have the rubber strip of identical rubber components and identical cross-sectional shape as the first rubber strip 8A and the second rubber strip 8B.
Fig. 4 (A)-4 (E) illustrates an embodiment who makes the winding body 9 that is used to form tread rubber TR (as shown in Figure 9), and it is an embodiment of rubber for tire assembly.Tread rubber TR is shown in broken lines.This void outline line is the object section shape of twining body 9, has the width that extends to another lateral margin e2 along tire axial from a lateral margin e1.In this respect, in the process that forms tread rubber TR from winding body 9, deform, revise twining body 9 according to its changing value.Herein, do not suppose and change.
At first carry out the starting point technique for fixing, the first rubber strip 8A and the second rubber strip 8B respectively twined the position of width inboard that starting point 8As, 8Bs are fixedly attached to each lateral margin e1, e2 of the object that twines.One lateral margin and another lateral margin e1, e2 specifically determine based on outline line.For example, limit lateral margin e1, e2, adopt two sides on the width that as shown in Fig. 4 (A), is trapezoidal or rectangular substantially substantially with expression.Limit the width between a lateral margin e1 and another lateral margin e2, with the Breadth Maximum RW between the expression both side edges.
Because the molded surface U of the object that twines is formed by Metal Flake body 3A in the present embodiment, therefore when twining rubber strip 8, do not deform, but be enough to form winding body 9 with good accuracy.Further specify as dotted line among Fig. 1, also can be around molded surface U winding of strips layer B etc. in advance.
Except the molded surface U of shaping mould 3, the object that twines can also be to remain not vulcanizing the green tire body or being wound with the green tire body of belt of cylindrical shape.Can directly twine rubber strip 8 around them.In this case, the non deformable fixator of needs use etc. supports the green tire body internally, thereby makes the green tire body can not deform because of the hot strength of rubber bodies 8.In this manual, " unvulcanised " state of rubber is meant the state that sulfurization is not finished fully.Therefore, only the object of presulfurization also is defined as the unvulcanised state that is in.
The winding body 9 that is formed on the tread rubber TR on the shaping mould 3 is stripped down, and make its composition that combines with another assembly give birth to the cover tire (not shown).By vulcanizing this life cover tire, obtain pneumatic tire.In this respect, as selection, twining body 9 can directly form on above-mentioned living cover tire matrix, rather than forms on shaping mould 3.
By winding starting point 8As, the 8Bs of the pressure roller 5 shown in Fig. 1 dotted line towards molded surface U side extruding rubber strip.Like this, winding starting point 8As, the 8Bs of rubber strip 8A, 8B fixedly are attached on the molded surface U by they self cohesive force.Be fixed adhere to after, pressure roller 5 can radially move to respect to the molded surface U of shaping mould 3 and the position that can not disturb loader 4.
The winding starting point 8Bs of the winding starting point 8As of the first rubber strip 8A and the second rubber strip 8B in the position of the width inboard of tread rubber TR (twine body 9) both side edges e1, e2, fixedly is bonded on the molded surface U.In other words, the winding starting point 8Bs of the winding starting point 8As of the first rubber strip 8A and the second rubber strip 8B is not positioned on the lateral margin e1 and e2 that twines body 9.
In the present invention, the rubber strip that is used to form the part of a lateral margin e1 is defined as the first rubber strip 8A, and the rubber strip that is used to form the part of another lateral margin e2 is defined as the second rubber strip 8B.In this respect, " forming the part of lateral margin e1, e2 " is meant the part of turning back, and rubber strip 8 is turned back at lateral margin e1, e2 place under the situation of not blocking and continued winding herein.Therefore, the part of turning back is formed by the second layer 11 in the ground floor 10 of radially inner side and ground floor 10 outsides of turning back at the lateral margin place.
According to the present embodiment, the winding starting point 8As of the first rubber strip 8A is provided at (position that does not wherein comprise another lateral margin e2 place certainly) between another lateral margin e2 and width center C L that twines body 9.The winding starting point 8Bs of the second rubber strip 8B is provided at (position that does not wherein comprise a lateral margin e1 place certainly) between tread rubber TR one lateral margin e1 and the width center C L.
In addition, the winding starting point 8As with the first rubber strip 8A of being arranged as in the present embodiment is fixedly attached to basically on the position of winding starting point 8Bs about the width center C L symmetry of tread rubber TR with the second rubber strip 8B.
More specifically, the first rubber strip 8A is arranged as makes its side 8As1 be positioned at the width center C L place of the present embodiment at the winding starting point 8As of a lateral margin e1 side.The second rubber strip 8B is arranged as makes its side 8Bs2 be positioned at the width center C L place of the present embodiment at the winding starting point 8Bs of another lateral margin e2 side.In other words, when along the circumferential direction arranged the position of twining starting point 8As, 8Bs, the side 8As1, the 8Bs2 that twine starting point 8As, 8Bs will be in contact with one another at width center C L place basically, for example as shown in Fig. 4 (A).
When side 8As1,8Bs2 are in contact with one another at width center C L place basically as mentioned above, this means that winding starting point 8As, the 8Bs of first and second rubber strips is positioned at the width middle body that twines body 9.In this respect, the width middle body cc of winding body 9 is approximately the width center C L zone of tread rubber 2.The width of width middle body cc is meant the zone that accounts for narrower part in the zone of tread rubber Breadth Maximum RW 30% around width center C L altogether, and the zone in width center C L is the double width scope of rubber strip 8.
As shown in Figure 2, provide the winding starting point 8As of first rubber strip and the winding starting point 8Bs of second rubber strip in the position of moving mutually along the circumferential direction at a distance of angle [alpha] (α ≠ 0 °).Though this angle [alpha] is not particularly limited, when it is excessive, can cause the device space very big owing to the layout of loader 4A, 4B.On the other hand, when it was too small, the first rubber strip 8A and the second rubber strip 8B may mutual interference mutually when intersecting.So, need angle [alpha] in about 10 °-40 ° scope.In addition, loader 4A, 4B need comprise the part that guiding rubber strip 8 extends along the tangential direction of molded surface U, shown in side view among Fig. 2.The preferred minimizing as much as possible of this part is applied to the external force effect that exceeds the quata on the rubber strip 8.
Next, shaping mould 3 rotates along direction shown in Figure 2, and loader 4A, 4B move laterally along the tyre revolution direction of principal axis.Rubber strip 8A, 8B twine around molded surface U spiral.The first rubber strip 8A is wound to this lateral margin e1 towards a lateral margin e1 spiral.The second rubber strip 8B is wound to this another lateral margin e2 towards another lateral margin e2 spiral.Finish the process (first winding step) that forms ground floor 10 after this manner.
Consider that air between shaping mould 3 and the rubber strip 8 is discharged to the place, both sides on the width, therefore also preferably outwards twines along rotor shaft direction (width) in the above described manner.
For example, when shaping mould 3 rotates with constant speed, can change the screw pitch P that twines rubber strip 8 along the axial translational speed of tyre revolution by control loader 4.By reducing the translational speed of loader 4, can reduce screw pitch P.In this case, increase the overlapping width of adjacent rubber strip 8, so that the thickness of this part becomes big.On the other hand, by improving the translational speed of loader 4, can strengthen screw pitch P.In this case, reduce the overlapping width of adjacent rubber strip 8, so that the less thick of this part or be zero substantially, thereby the thickness that can control this part makes it extremely thin.Screw pitch P, promptly the translational speed of loader is carried out tentatively definite according to the cross sectional shape of needed tread rubber TR, the cross sectional shape of rubber strip 8 and the rotary speed of shaping mould 3.These information are input to the controller (not shown) of the translational speed control (not shown) that is used for loader 4A, 4B, according to moving of their control loaders 4.Be not particularly limited though twine pitch P (screw pitch P), be preferably 3-10mm, more preferably 5-7mm.
According to the present embodiment, the winding starting point 8As of the first rubber strip 8A is between another lateral margin e2 and width center C L that twine body 9, as mentioned above.The winding starting point 8Bs of second rubber strip is between the lateral margin e1 and width center C L of tread rubber TR.In addition, move winding starting point 8As, the above-mentioned position along the circumferential direction of 8Bs.Therefore, along with the rotation of shaping mould 3, the first and second rubber strip 8A, 8B twine successively from starting point 8As, 8Bs, as shown in Figure 2.The first rubber strip 8A and the second rubber strip 8B intersect at the width center C L place of tread rubber TR (twine body 9) and noiseless, and winding continuously.By at width center C L place rubber strip 8 so being intersected, can eliminate the interval that is easy to be formed on the width central portion office of twining body 9.
In the present embodiment, during first winding step, control the first loader 4A and the second loader 4B simultaneously.More specifically, though the moving direction of each loader 4A, 4B is opposite, they are controlled as has substantially the same at any time translational speed.Therefore, in first winding step, each loader 4A, 4B (that is: the first rubber strip 8A and the second rubber strip 8B) are at any time basically about width center C L symmetry.When the first rubber strip 8A arrives a lateral margin e1, can make the second rubber strip 8B arrive another lateral margin e2.Therefore, rubber strip 8 is compared in a spiral manner to the situation that another lateral margin e2 twines continuously from a lateral margin e1, can be shortened the winding time, thereby boost productivity with utilizing single loader.The ground floor 10 that is formed by first winding step has the width RW that extends to another lateral margin e2 from a lateral margin e1.The winding arrangement of rubber strip 8 (border of rubber strip 8) will be the plane about the vertical plane symmetry that comprises width center C L basically.
In particularly preferred embodiments, the first rubber strip 8A twines arbitrarily small length along a lateral margin e1 in a circumferential direction.Like this, need comprise the step of eliminating discontinuous part k shown in Figure 17.For the second rubber strip 8B, need along the circumferential direction twine random length at another lateral margin e2 too.Rubber strip 8 can be set according to the screw pitch or the width W of rubber strip 8 rightly at each lateral margin e1, e2 place coiling length along the circumferential direction.This cross sectional shape that helps making tread rubber is uniformity in a circumferential direction.
In the present embodiment, subsequently the first rubber strip 8A is turned back at a lateral margin e1 place under situation about not cutting off, and twine towards another lateral margin e2 spiral.By turn back the second rubber strip 8B and twine at another lateral margin e2 place, finish second winding step that forms the second layer 11 in the outside of ground floor 10 continuously towards a lateral margin e1 spiral.
In second step, control the first loader 4A and the second loader 4B in the mode of mutual while equally.That is to say that though the moving direction of each loader 4A, 4B is opposite, they are controlled as has substantially the same at any time translational speed.Therefore, in second winding step, each loader 4A, 4B (that is: the first rubber strip 8A and the second rubber strip 8B) are placed in basically about on the symmetrical plane, the sagittal plane that comprises tread rubber TR width center C L.Similar to first winding step, with utilizing single loader rubber strip is compared in a spiral manner to the situation that another lateral margin e2 twines continuously from a lateral margin e1, can shorten the winding time, thereby boost productivity.
Like this, after forming ground floor 10, rubber strip 8 is wrapped in its outside continuously and forms the second layer 11 under situation about not cutting off.Therefore, between first winding step and second winding step, rubber strip 8 can interruptedly not twine continuously, thereby productivity ratio is improved.
In second winding step, limit lessly in the screw pitch of rubber strip 8A, the 8B at width outer fix place with twining body 9.By the screw pitch of relative increasing width central side, form the thickness distribution that reduces gradually with smooth manner to the width central side.This cross sectional shape with the tread rubber that makes by traditional extrusion molding is close.Therefore, can be by continuing to use conventional tire metal sulphide mould (mould) to make tire.
Then, carry out second winding step, the winding terminal point 8Af of first rubber strip and the winding terminal point 8Bf of second rubber strip are positioned on the position of each lateral margin e1, e2 inboard on the width.Finish after second winding step, cut off the first and second rubber strip 8A, 8B.By utilizing pressure roller 5 that the end is pressed on ad-hoc location, carry out to twine the fixing step that terminal point 8Af, 8Bf fixedly adhere to subsequently.Utilize (not shown) such as cutting tool, finish the cutting of the first and second rubber strip 8A, 8B automatically.
Figure 10 (A) and 10 (B) illustrate the winding body 9 that obtains by first and second winding step along X-among Fig. 4 (E) and Y-cross section.It is the position w1 place of the angle of 180 degree away from the winding terminal point 8Af of the first rubber strip 8A in a circumferential direction substantially that the position w2 of the winding terminal point 8Bf of the second rubber strip 8B preferably provides.Like this, the homogeneity of rubber specification and weight balancing can further improve, thereby further improve the homogeneity of tire.
As shown in Figure 10 (A) and 10 (B), need be with winding terminal point 8Af, the 8Bf of rubber strip 8A, 8B along twining the place ahead that circumferencial direction is positioned to twine starting point 8As, 8Bs, and near twining starting point 8As, 8Bs, to improve homogeneity.
Further configuration the present embodiment makes the winding terminal point 8Af of first rubber strip be fixedly attached to basically winding terminal point 8Bf with second rubber strip about twining on the centrosymmetric position of body (being equal to tread rubber TR basically) width.Shown in Fig. 4 (E), in the present embodiment, winding terminal point 8Af, the 8Bf on the tread rubber TR width center C L overlaps on the width center of twining body 9 mutually.According to the present embodiment, terminal point 8Af, 8Bf thereby be positioned at width center C L zone (width middle body cc).
Utilizing such winding body 9, can obtain the cross sectional shape of plane symmetry basically, is not only for contour shape, also comprises the winding arrangement of the first and second rubber strip 8A, 8B, all about comprising the sagittal plane symmetry of width center C L.In addition, all of the first and second rubber strip 8A, 8B are twined the position that starting point 8As, 8Bs and winding terminal point 8Af, 8Bf are positioned at the width inside of lateral margin e1, e2.This tread rubber TR makes cross sectional shape homogenization in a circumferential direction, and improves the homogeneity of tire.Can also avoid because the winding starting point of rubber strip 8 or twine terminal point and be positioned at the defective that lateral margin e1, e2 place cause is cracked as crack or rubber.
Fig. 5 (A)-5 (B) schematically shows the winding starting point that makes the first and second rubber strip 8A, 8B and twines terminal point another embodiment inequality.In the embodiment shown in Fig. 5 (A), the winding starting point 8As of the first rubber strip 8A is provided between a width center C L and the lateral margin e1.The winding starting point 8Bs of the second rubber strip 8B is provided between width center C L and another lateral margin e2.The winding terminal point 8Af of the first rubber strip 8A is provided between width center C L and another lateral margin e2.The winding terminal point 8Bf of the second rubber strip 8B is provided between a width center C L and the lateral margin e1.Do not intersect at width center C L place though twine starting point 8As and 8Bs, they intersect in arriving the process of twining terminal point 8Af and 8Bf mutually.Like this, can guarantee the thickness of tread rubber TR middle body.
Embodiment shown in same Fig. 5 of embodiment (A) is the same shown in Fig. 5 (B).In embodiment shown in Fig. 5 (B), all winding starting point 8As, 8Bs and winding terminal point 8Af, 8Bf are provided at the centre of width center and lateral margin e1 or e2 basically.Fig. 5 (C) further specifies the situation that in second winding step rubber strip 8A, 8B further turn back at lateral margin e1, e2 place and be wound to width center C L side.Like this, the winding starting point of rubber strip 8A, 8B and winding terminal point can be provided in needed position.In this way, also can form and have three layers or the more multi-layered body of turning back.
Above embodiment illustrates the embodiment that whole tread rubber TR is made up of the first and second rubber strip 8A, 8B.Yet, can only form the part of tread rubber TR.For example, have at tread rubber TR under the situation of a plurality of parts of different rubber compositions (Fig. 6 (A), 6 (B) and 7), tread rubber TR forms by three layers.This for example explanation make the situation of one deck at least (rubber layer in Fig. 6 (A), 6 (B) and 7 the example on the outermost radial outside) according to the inventive method.
Shown in Fig. 6 (A), before first winding step, at first on the molded surface U of shaping mould 3, form bottom 14.Bottom 14 forms step by bottom and forms, and the 3rd rubber strip 13 along the circumferential direction twines to the part spiral near another lateral margin e2 from the part near a lateral margin e1 in the described bottom formation step.In this embodiment, the bottom 14 that on width, overlaps slightly and form little width by the side that makes the 3rd rubber strip 13.
Because bottom 14 is bonded to belt, therefore preferred employing shows and the topping rubber of for example belt has excellent close-burning rubber components.The winding starting point 13s of bottom 14 and winding terminal point 13f also are positioned at the position of the width inside of tread rubber TR both side edges e1 and e2.Like this, also prevent the winding starting point 13s of rubber strip in bottom 14 and twine both side edges e1 and the e2 place that terminal point 13f is positioned at tread rubber TR.Formation crack or rubber are peeled off in the bottom 14 that therefore can effectively prevent to locate in the tread rubber both sides.In addition, because the belt width usually less than tread rubber width RW, therefore can make bottom 14 have little width like this.
As shown in Fig. 6 (B), comprise that the 4th rubber strip 15 of the rubber components that is different from the 3rd rubber strip 13 twines to another lateral margin e2 part spiral from the part near a lateral margin e1.Twine by this, intermediate layer 16 is formed on the outside of bottom 14.This process is called " intermediate layer formation step ".Arrange intermediate layer 16 and make the winding that overlaps mutually of the side of the 4th rubber strip 15.Because intermediate layer 16 is disposed at for example inside of tread rubber TR, therefore need it to have the rubber components of low-heat-generation and low-yield loss.
The winding starting point 15s of the 4th rubber strip 15 in formation intermediate layer 16 and winding terminal point 15f also are positioned at the position of the width inside of tread rubber TR both side edges e1 and e2.Like this, twine starting point 15s and twine lateral margin e1 and the e2 place that terminal point 15f will can not be positioned at tread rubber TR, therefore can effectively avoid intermediate layer 16 to peel off at the crack or the rubber at tread rubber TR lateral margin e1, e2 place.
The outside in bottom 14 and intermediate layer 15 forms the surface layer (cap layer) 17 that travels.This surface layer 17 that travels is according to winding body 9 of the present invention, and is formed by the first rubber strip 8A and the second rubber strip 8B.Fig. 7 illustrates the sectional view of the tread rubber TR of formation like this.Tread rubber TR is formed by the layer that multilayer (three layers) has different rubber components.Because the arrangement of tread rubber TR makes the rubber strip 8A, the 8B that form all layers, 13 and 15 winding starting point and twines the position that terminal point is provided at the lateral margin e1 of tread rubber TR and e2 (comprise tread rubber travel the lateral margin e1 and the e2 of winding body 9 of surface layer 17) inside (width central side), therefore can prevent from more reliably to form crack etc., and can improve the durability of rubber assembly at the winding starting point and the winding destination county of rubber strip.
Can when the winding of bottom 14 is all finished, can produce the dead time in this case though form the winding of the 4th rubber strip 15 in intermediate layer 16, thereby reduce productivity ratio.Preferably, shown in Fig. 8 (A)-8 (D), after beginning to twine, the 3rd rubber strip 13 in the time period that finishes winding, begins to twine the 4th rubber strip 15.More specifically, shown in Fig. 8 (A), the 3rd rubber strip 13 at first is wound on the shaping mould 3 and forms specified width, which width.At this moment, the winding one of the 3rd rubber strip 13 stops, and just the winding starting point 15s with the 4th rubber strip 15 is fixed on its outside (Fig. 8 (B)).Preferably twine the 3rd rubber strip 13 and the 4th rubber strip 15 simultaneously towards another lateral margin e2 side subsequently.Like this, can shorten and twine the required time of rubber strip 15, thereby further boost productivity.
Fig. 9 explanation comprises the partial enlarged drawing according to pneumatic tire 1 tread portion of the rubber for tire assembly of above-mentioned embodiment.In this embodiment, the heavy-duty pneumatic tire that uses has been described in truck and bus.Pneumatic tire 1 comprises carcass 21 that is made by all-steel cord and the belt 22 that places its outside, and tread rubber 23 places the outside of belt 22.
At least a portion tread rubber 23 is to utilize the winding body 9 that is formed by said method to form.The winding starting point 8As of first and second rubber strips and 8Bs are positioned at the position of tread edge eT1, eT2 inside on width.Equally, the winding terminal point 8Af of first and second rubber strips and 8Bf also are positioned at the position of tread edge eT1, eT2 inside on width.Such pneumatic tire helps improving the homogeneity of tire and the durability of tread rubber, because side Te1, Te2 place that the winding starting point of rubber strip and terminal point can not be positioned at tread edge eT1, eT2 and extend thus.In this respect, after the same sulfuration, when using sharp cutting tool that tire is cut off, the border surface of rubber strip 8 also indistinctly appears on the section.Can limit the position of twining starting point 8As, 8Bs and winding terminal point 8Af, 8Bf thus.
Figure 11 (A)-11 (C) illustrates another embodiment.Tread rubber according to the present embodiment uses single rubber strip 8 to make.At first, shown in Figure 11 (A), the winding starting point 8s of rubber strip 8 is fixedly attached to the width middle body cc that twines body 9.Then this rubber strip is wound to this lateral margin e1 towards a lateral margin e1 spiral.Like this, basically, form half part 10a of the ground floor 10 of tread rubber TR.
Then, rubber strip 8 place, end at lateral margin e1 under situation about not cutting off that is wound to the end, lateral margin e1 place of tread rubber TR is twined towards width middle body spiral.Like this, at the radial outside of ground floor 10, form the half part 11a (Figure 11 (B)) of the second layer 11 basically.
The other end spiral of rubber strip 8 towards lateral margin e2 place that is wound to the width middle body is wound to this end at lateral margin e2 place.Like this, basically, form the half part 10b that ground floor 10 is left.Then, rubber strip 8 end at lateral margin e2 place under situation about not cutting off is repeated the spiral winding from the end of lateral margin e2 in an identical manner to the width middle body.Like this, basically, can form the half part 11b (Figure 11 (C)) that the second layer 11 is left.
Form in the step at the tyre surface of the present embodiment, twine body 2 with the similar tread rubber TR of Fig. 1 and 2 basically and can utilize single rubber strip 8 to form, so this helps simplifying the tread rubber forming device.
Figure 12 explanation utilizes the partial enlarged drawing of the pneumatic tire 1 of above-mentioned tread rubber 8 manufacturings.Pneumatic tire 1 comprises ring-type carcass 21 and places the belt 22 in its outside that tread rubber TR places the outside of belt 22.
Though embodiment of the present invention have been described so far, and the present invention not only can be used for tread rubber, also can be used for sidewall rubber, interior line with rubber or pad glue, as long as they are rubber for tire assemblies of ring-type.The rubber assembly that makes by the present invention not only can be used for heavy-duty pneumatic tire, also can be used for various types of other pneumatic tire.
Embodiment
The heavy-duty pneumatic tire that 20 tire size are 11R22.5R all utilizes the multiple tread rubber manufacturing of not vulcanizing according to this specification, and is as shown in table 1.Except tread rubber, tread contour all is identical with internal structure.All tire is carried out the homogeneity and the durability evaluating of tread rubber.
Appraisal procedure is as follows.
＜homogeneity 〉
Measure the circular runout (PRO) (mean value) of each sample tire and be expressed as index, the PRO of reference examples 1 is defined as 100 with n=20.This value is more little, and is then favourable more.
＜tread rubber durability 〉
The sample tire is assemblied on 7.50 * 22.5 the wheel hub, and to make it be with the air pressure of 700kPa, the load of 50kN and the speed running 50 of 100km/h at radius on the rotary drum of 1.7m, 000km estimates tread rubber then, and after range estimation it is cut open to check the internal injury situation.
Test result is shown in table 1.
Table 1
| Embodiment | Reference examples 1 | Reference examples 2 | Reference examples 3 | |
| The accompanying drawing of this tread rubber structure is described | Fig. 4 | Figure 14 | Figure 15 | Figure 16 |
| Homogeneity (index) (PRO) | 95 | 100 | 105 | 105 |
| Tread rubber durability (range estimation) | Do not find crack or gauffer | Forming fine cracks near the tread edge place | Do not find crack or gauffer | Do not find crack or gauffer |
| Tread rubber durability (cutting inspection open) | Do not find crack or gauffer | Forming fine cracks near the tread edge place | Forming fine cracks near the tread edge place | Forming fine cracks near the tread edge place |
Can determine by test result, compare that the tire among the embodiment is all increasing aspect homogeneity and the tread rubber durability with the tire in the reference examples.
Claims (11)
1. make airtyred method for one kind, described pneumatic tire comprises that utilization twines the rubber for tire assembly that body forms by the annular that winding of band-type unvulcanized rubber bar in a spiral manner obtains, and this method comprises:
At the width inner side place of twining each lateral margin of body, make the winding starting point of the winding starting point of first rubber strip and second rubber strip be fixedly attached to the step on the object of twining;
By first rubber strip is twined until a described lateral margin to a lateral margin spiral, and first winding step that second rubber strip is formed ground floor to another lateral margin spiral winding until described another lateral margin, wherein the side surface of the winding starting point of first rubber strip on a described lateral margin direction is positioned at the width center of described winding body, the side surface of the winding starting point of second rubber strip on described another lateral margin direction is positioned at the width center of described winding body, and first rubber strip and second rubber strip are intersected in described width center;
By at a described lateral margin place first rubber strip being turned back and it being twined and do not block to described another lateral margin spiral, and at described another lateral margin place second rubber strip is turned back and it is twined and do not block to a described lateral margin spiral, and form second winding step of the second layer continuously in the ground floor outside; With
The winding terminal point of the winding terminal point of first rubber strip and second rubber strip is fixedly attached to the step at the width inner side place of each lateral margin.
2. the airtyred method of manufacturing as claimed in claim 1, wherein the winding terminal point of first rubber strip is fixedly attached to basically winding terminal point with second rubber strip about twining the centrosymmetric position of width of body.
3. the airtyred method of manufacturing as claimed in claim 1, wherein the winding terminal point of first and second rubber strips is positioned at the width middle body of described winding body.
4. the airtyred method of manufacturing as claimed in claim 3, wherein the winding terminal point of first and second rubber strips vertically overlaps in the width center of twining body.
5. the airtyred method of manufacturing as claimed in claim 1, wherein said rubber for tire assembly are tread rubber or its part.
6. the airtyred method of manufacturing as claimed in claim 1, wherein first rubber strip has identical rubber composition and identical cross sectional shape with second rubber strip.
7. the airtyred method of manufacturing as claimed in claim 1, comprise that also bottom forms step, promptly before first winding step, by with rubber strip along the circumferential direction from a lateral margin to another lateral margin be spirally wound on twine on the object and at the inboard bottom that forms of ground floor.
8. the airtyred method of manufacturing as claimed in claim 7, comprise that also the intermediate layer forms step, promptly form between the step and first winding step, by along the circumferential direction twining rubber strip and between bottom and ground floor, form the intermediate layer to another lateral margin spiral from a lateral margin at bottom.
9. one kind provides the pneumatic tire of tread rubber at tread portion,
Wherein at least a portion tread rubber is made up of the band duplexer, and described band duplexer comprises
By twining the ground floor that body is formed, wherein first rubber strip twines until a described tread edge towards a tread edge spiral, and second rubber strip twines until described another tread edge towards another tread edge spiral, wherein the side surface of the winding starting point of first rubber strip on a described tread edge direction is positioned at the width center of described winding body, the side surface of the winding starting point of second rubber strip on described another tread edge direction is positioned at the width center of described winding body, and first rubber strip and second rubber strip are intersected in described width center and
By twining the second layer that body is formed, the described second layer is not by cutting off first rubber strip and second rubber strip and making it turn back at the tread edge place of lateral margin separately and twine and be formed on the outside of ground floor continuously towards the tire equator spiral, and the winding terminal point of first rubber strip and second rubber strip is provided at the position of the width inboard of tread edge simultaneously.
10. pneumatic tire as claimed in claim 9, wherein the winding terminal point of first and second rubber strips is positioned at the width middle body that twines body.
11. pneumatic tire as claimed in claim 10, wherein the winding terminal point of first and second rubber strips vertically overlaps in the width center of twining body.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004247172 | 2004-08-26 | ||
| JP2004247172A JP4589684B2 (en) | 2004-08-26 | 2004-08-26 | Manufacturing method of rubber member for tire and pneumatic tire |
| JP2004325391 | 2004-11-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1739949A CN1739949A (en) | 2006-03-01 |
| CN100488761C true CN100488761C (en) | 2009-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100903447A Expired - Fee Related CN100488761C (en) | 2004-08-26 | 2005-08-12 | Method for manufacturing a pneumatic tire and a pneumatic tire obtained thereby |
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| Country | Link |
|---|---|
| JP (1) | JP4589684B2 (en) |
| CN (1) | CN100488761C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870257B1 (en) * | 2005-04-15 | 2012-03-07 | Bridgestone Corporation | Pneumatic tire for motorcycle and method of manufacturing the same |
| DE102006019262A1 (en) * | 2006-04-26 | 2007-10-31 | Continental Aktiengesellschaft | Process to manufacture pneumatic automotive tire with inner wall of high conductivity rubber penetrating outer tread of lower electrical conductivity |
| JP5226970B2 (en) * | 2007-05-18 | 2013-07-03 | 住友ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
| JP5452123B2 (en) * | 2009-08-05 | 2014-03-26 | 住友ゴム工業株式会社 | Pneumatic tire manufacturing method |
| JP5247852B2 (en) | 2010-11-05 | 2013-07-24 | 住友ゴム工業株式会社 | Pneumatic tire manufacturing method |
| JP5225431B2 (en) | 2010-12-06 | 2013-07-03 | 住友ゴム工業株式会社 | Strip, method for producing the same, and method for producing a pneumatic tire |
| JP5222352B2 (en) * | 2010-12-16 | 2013-06-26 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP5841816B2 (en) * | 2011-11-24 | 2016-01-13 | 東洋ゴム工業株式会社 | Pneumatic tire manufacturing method and pneumatic tire manufacturing apparatus |
| JP6061577B2 (en) * | 2011-12-19 | 2017-01-18 | 東洋ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
| JP6084444B2 (en) * | 2012-11-22 | 2017-02-22 | 東洋ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
| JP6077281B2 (en) * | 2012-11-22 | 2017-02-08 | 東洋ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
| JP6353347B2 (en) * | 2014-11-10 | 2018-07-04 | 住友ゴム工業株式会社 | Manufacturing method of rubber member |
| CN106217920A (en) * | 2016-09-28 | 2016-12-14 | 青岛软控机电工程有限公司 | Tread components manufactures device and manufacture method |
| JP7099939B2 (en) * | 2018-11-26 | 2022-07-12 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Tire member molding device, tire member inspection method and tire member manufacturing method |
| CN111152491B (en) * | 2019-12-30 | 2022-03-08 | 厦门洪海机械有限公司 | Method for rapidly calculating process profiles of various crown band strips |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3397430B2 (en) * | 1994-03-15 | 2003-04-14 | 株式会社ブリヂストン | Manufacturing method of pneumatic tire |
| JP2673675B2 (en) * | 1995-06-02 | 1997-11-05 | 横浜ゴム株式会社 | Winding device for tire belt reinforcement layer |
| JP5013636B2 (en) * | 2000-05-24 | 2012-08-29 | 株式会社ブリヂストン | Method for forming tire constituent member |
| JP3566915B2 (en) * | 2000-09-07 | 2004-09-15 | 住友ゴム工業株式会社 | Method of manufacturing rubber member for tire |
| JP4868561B2 (en) * | 2001-01-11 | 2012-02-01 | 東洋ゴム工業株式会社 | Tire and tire manufacturing method |
| EP1358998B1 (en) * | 2001-01-31 | 2008-01-16 | Bridgestone Corporation | Tire manufacturing method |
| JP2002347135A (en) * | 2001-05-29 | 2002-12-04 | Bridgestone Corp | Tire manufacturing method |
| JP4763928B2 (en) * | 2001-07-25 | 2011-08-31 | 株式会社ブリヂストン | Rubber molded body manufacturing apparatus and rubber molded body manufacturing method |
| JP4039895B2 (en) * | 2002-06-24 | 2008-01-30 | 横浜ゴム株式会社 | Method for forming tire tread component and pneumatic tire |
| JP4060173B2 (en) * | 2002-12-12 | 2008-03-12 | 横浜ゴム株式会社 | Pneumatic tire and method for manufacturing pneumatic tire |
-
2004
- 2004-08-26 JP JP2004247172A patent/JP4589684B2/en not_active Expired - Fee Related
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2005
- 2005-08-12 CN CNB2005100903447A patent/CN100488761C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP4589684B2 (en) | 2010-12-01 |
| JP2006062196A (en) | 2006-03-09 |
| CN1739949A (en) | 2006-03-01 |
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