CN109927490A - The manufacturing method of green tire and pneumatic tire - Google Patents
The manufacturing method of green tire and pneumatic tire Download PDFInfo
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- CN109927490A CN109927490A CN201811396858.9A CN201811396858A CN109927490A CN 109927490 A CN109927490 A CN 109927490A CN 201811396858 A CN201811396858 A CN 201811396858A CN 109927490 A CN109927490 A CN 109927490A
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- bead core
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Abstract
It prevents or inhibits the separation due to the rubber-coated and steel wire on pneumatic tire that bead core is caused to break down.The bead core (6) of green tire (1) has: more steel bead wires (8), in the section of the width direction of bead core (6), in the width direction and radially interval configuration of bead core (6)；And rubber-coated (9), it is filled between steel bead wire (8).Radially outside is convex to the radial lateral surface (6a) of bead core (6) in the section of the width direction of bead core (6).Radially inside is convex to the radial medial surface (6b) of bead core (6) in the section of the width direction of bead core (6).
Description
Technical field
The present invention relates to the manufacturing methods of a kind of green tire and pneumatic tire.
Background technique
Patent document 1 is related to a kind of bead core of pneumatic tire, discloses through diameter of setting steel bead wire etc. and presses down
Make rubber-coated and steel bead wire separation.
Patent document 1: Japanese Patent Publication 2008-062739 bulletin
Summary of the invention
(1) technical problems to be solved
But including technology disclosed in patent document 1, previous pneumatic tire prevent due to it is rubber-coated with
The aspect that the separation of steel bead wire causes bead core to break down has room for improvement.
Problem of the present invention is that preventing or the separation due to the rubber-coated and steel wire on pneumatic tire being inhibited to cause
Bead core breaks down.
(2) technical solution
The 1st aspect of the present invention provides a kind of green tire, has the cricoid of the inner-diameter end for being located at a pair of sidewall portion
Bead core, the bead core have: more steel bead wires, in the section of the width direction of the bead core, in the tire
Enclose the width direction of core and the radially interval configuration of the bead core；And it is rubber-coated, it is filled in described more
Between steel bead wire, the radial lateral surface of the bead core radially outside in the section of the width direction of the bead core
For convex, radially inside is convex to the radial medial surface of the bead core in the section of the width direction of the bead core
Shape.
In general, when manufacture to green tire carry out sulfidization molding made of pneumatic tire when, have from casingply to
Bead core acts on the tendency of biggish tension.Thus, it is supposed that the lateral surface of the radial direction of bead core and inside in the state of green tire
Face is flat shape in the section of the width direction of bead core, then when carrying out sulfidization molding, due to from casingply
The tension acted on to bead core, medial surface deforms along casingply, and lateral surface is due to the tension that acts on from casingply
And it shrinks and deforms in the direction of the width.Become convex by the lateral surface and medial surface that make bead core in the state of green tire,
That is, the bead core of the state by making green tire become with shape same after sulfidization molding, so as to inhibit due to
The deformation of lateral surface caused by the tension acted in sulfidization molding from casingply to bead core and medial surface can be reduced
Initial deformation.As a result, can be effectively prevented or press down in the pneumatic tire obtained to green tire progress sulfidization molding
System breaks down because the deformation generated on steel bead wire periphery causes rubber-coated separate with steel bead wire in bead core.
It is preferred that the section shape of the width direction of the bead core of the lateral surface be radius of curvature be 5mm or more and
15mm arc-shaped below, the section shape of the width direction of the bead core of the medial surface be radius of curvature be 5mm with
Upper and 15mm arc-shaped below.
It is preferred that it is the bead core that the section shape of the width direction of the bead core of the lateral surface, which is radius of curvature,
Width direction length 50% or more and 150% arc-shaped below, the width side of the bead core of the medial surface
To section shape be radius of curvature be the bead core width direction length 50% or more and 150% circular arc below
Shape.
The 2nd aspect of the present invention provides a kind of manufacturing method of pneumatic tire, by the way that shoestring is repeatedly wound in longitudinal direction
Layered laminate manufactures bead core, wherein and the shoestring is aligned more bead cores in a row with rubber-coated cladding and forms, and
The thickness of width direction central portion is thicker than the thickness at width direction both ends, and the radial lateral surface of the bead core is in the tire
Radially outside is convex in the section of the width direction of circle core, and the radial medial surface of the bead core is in the bead core
Radially outside is convex in the section of width direction, carries out sulfidization molding to the green tire for having the bead core.
(3) beneficial effect
The pneumatic tire for carrying out sulfidization molding to green tire and obtaining of the invention can prevent or inhibit due to coating rubber
The separation of glue and steel wire causes bead core to break down.
Detailed description of the invention
Fig. 1 is the show in schematic partial sections on the meridian direction of the green tire of embodiment of the present invention.
Fig. 2 is the schematic cross sectional views in the width direction of bead core.
Fig. 3 is the schematic cross sectional views for the shoestring for manufacturing the bead core of embodiment of the present invention.
Fig. 4 is the show in schematic partial sections on the meridian direction of the green tire of comparative example.
Description of symbols
1- green tire；2- cover tire；3- sidewall；4- bead part；5- casingply；6- bead core；The lateral surface of 6a- radial direction；6b-
Radial medial surface；The lateral surface of 6c- width direction；The medial surface of 6d- width direction；7- bead-core；8- steel bead wire；9- packet
Cover rubber；10- shoestring；The face 10a, 10b-.
Specific embodiment
Fig. 1 shows the green tires 1 of embodiments of the present invention.It indicates that sulphur will be carried out to green tire 1 except bead core 6 in Fig. 1
Chemical conversion type and obtain the shape after pneumatic tire.Green tire 1 has circular cover tire 2.The inner peripheral surface of cover tire 2 is provided with liner
Layer (not shown).Cover tire 2 has: a pair of sidewall portion 3, is connected simultaneously with the tire width direction outer end of fetus face (not shown)
Extend to tire radial direction inner side；And a pair of bead portion 4, it is located at the inner-diameter end of each sidewall 3.In fetus face and sidewall 3
Tire inner face side casingply 5 is equipped in the mode being set up between a pair of bead portion 4.The green tire 1 of present embodiment
It is that fork truck is used, diameter of the cord (for example, steel cord or organic fiber cord) relative to tire possessed by casingply 5
To obliquely configuring.That is, green tire 1 is cross-ply.
Each bead part 4 has cricoid bead core 6 and is configured at the same annular in shape of the tire radial outside of bead core 6
Bead-core 7.The width direction for indicating bead core 6 with appended drawing reference W in the figure, the radial direction of bead core 6 is indicated with appended drawing reference R.
Fig. 2 is combined to carry out reference together, bead core 6 has the steel bead wire 8 of steel in the present embodiment and is filled in
Rubber-coated (electro-insulating rubber) 9 between steel bead wire 8.More specifically, the section of the width direction of bead core 6 (green tire 1
Section on meridian direction) in, width direction of more (the being 7 in the present embodiment) steel bead wires 8 in bead core 6
Interval configures on (being the same direction with tire width direction), and more (being 8 in the present embodiment) steel bead wires 8 exist
Interval configures in the radial direction (being radially the same direction with tire) of bead core 6.In the present embodiment, in bead core 6
In the section of width direction, more steel bead wires 8 are in the width direction of bead core 6 and radially distinguishing equably for bead core 6
Configuration.
In the present embodiment, the section shape of the width direction of bead core 6 is about quadrangle.In more detail, tire
Circle core 6 has: lateral surface 6a is the face of the radial outside positioned at bead core 6；And medial surface 6b, it is to be located at bead core 6
Radially inner side face.In addition, bead core 6 has the lateral surface 6c and medial surface 6d of the width direction of bead core 6, connection is outer
Side 6a and medial surface 6b.
The radial lateral surface 6a of bead core 6 is curved surface, and the shape on the section of the width direction of bead core 6 is towards diameter
The arc-shaped protruded outward.In addition, the radial medial surface 6b of bead core 6 is curved surface, cutd open in the width direction of bead core 6
Shape on face is radially inside arc-shaped outstanding.The lateral surface 6c and medial surface 6d of the width direction of bead core 6 be
Flat surface, the shape on the section of the width direction of bead core 6 are all linear.
The radius of curvature α 1 of the circular arc of section shape in the width direction of the radial lateral surface 6a of bead core 6 is set as
5mm or more and 15mm or less.In addition, radius of curvature α 1 be set as 50% or more of the length L of the width direction of bead core 6 and
150% or less.
The radius of curvature α 2 of the circular arc of section shape in the width direction of the radial medial surface 6b of bead core 6 is set as
5mm or more and 15mm or less.Radius of curvature α 2 is set as 50% or more and 150% of the length L of the width direction of bead core 6
Below.
In the present embodiment, the face relative to the appearance profile of the bead core 6 on the section of the width direction of bead core 6
Product is for bead core sectional area, and rubber-coated 9 area ratio is set as 65% or more and 75% or less.
In addition, in the present embodiment, on the section of the width direction of bead core 6 in the width direction of bead core 6
The minimum interval A between two steel bead wires 8 to adjoin each other is set as 0.52 times or more and 0.73 of the diameter D of bead core 6
Times or less.
Moreover, in the present embodiment, on the section of the width direction of bead core 6 bead core 6 radially mutually
Minimum interval B between two adjacent steel bead wires 8 be set as 0.41 times or more and 0.63 times of the diameter D of bead core 6 with
Under.
Moreover, in the present embodiment, on the section of the width direction of bead core 6 from the appearance profile with bead core 6
The shortest distance C of width direction of bead core 6 of the most adjacent steel bead wire 8 to appearance profile, that is width direction end
The rubber-coated thickness in portion is set as being more than the 1/2 of minimum interval A.
Referring to Fig. 3, the bead core 6 in present embodiment is by (being 8 in the present embodiment by shoestring more than 10 times
It is secondary) be wound in longitudinal layered laminate and manufacture, wherein shoestring 10 with rubber-coated 9 coated alignment it is in a row more (this
It is 7 in embodiment) steel bead wire 8 forms.(6a pairs of the face with the radial outside of bead core 6 face 10a of the shoestring 10
Answer) and face 10b (corresponding with the face 6b of the radially inner side of bead core 6) be with 30mm or more and 120mm radius of curvature β below
1, the curved surface of the convex of β 2.Therefore, the thickness T1 of the width direction central portion of the shoestring 10 is thicker than width direction both ends
It is thick to spend T2.By using the shoestring 10 of distribution is had a thickness that, to obtain radial lateral surface 6a and medial surface 6b
It is the bead core 6 of the curved surface of arc-shaped.Inflation is manufactured and carrying out sulfidization molding to the green tire 1 with a pair of bead core 6
Tire.
In general, when manufacture to green tire carry out sulfidization molding made of pneumatic tire when, have from casingply to
Bead core acts on the tendency of biggish tension.It is especially significant in the case where tendency cross-ply as present embodiment.
Therefore, as shown in figure 4, if the radial lateral surface 6a and medial surface 6b of bead core 6 is the width side of flat surface, bead core 6
To section on shape be it is linear, then when sulfidization molding, due to the tension acted on from casingply 5 to bead core 6,
Medial surface 6b is deformed along casingply 5, and lateral surface 6a is due to the tension that acts on from casingply 5 and in the direction of the width
It shrinks and deforms.Be due to the deformation, before sulfidization molding flat surface lateral surface 6a and medial surface 6b after sulfidization molding all at
For the curved surface of convex.
In the present embodiment, by making the lateral surface 6a and medial surface 6b of bead core 6 become convex in the state of green tire 1
The curved surface of shape, that is become with shape same after sulfidization molding, so as to inhibit due in sulfidization molding from tire
The deformation of lateral surface 6a and medial surface 6b caused by the tension that body casing ply 5 is acted on to bead core 6, can reduce initial deformation.
As a result, can be effectively prevented or inhibit because in tire in the pneumatic tire obtained to the progress sulfidization molding of green tire 1
The deformation that circle 6 periphery of steel wire generates causes rubber-coated 9 to separate with steel bead wire 8 and break down in bead core 6.
As previously mentioned, working as the section shape in the width direction of the radial lateral surface 6a and medial surface 6b of bead core 6
Radius of curvature α 1, the α 2 of circular arc when being set as 5mm or more and 15mm or less, then as shown in figure 4, with lateral surface 6a and medial surface
It is carried out in the case that 6b is flat shape in the section of the width direction of bead core 6 when sulfidization molding after generated deformation
Radius of curvature it is same.Therefore, outer when so as to by sulfidization molding by the way that radius of curvature α 1, α 2 are set in the range
The deformation of side 6a and medial surface 6b are suppressed to irreducible minimum.
By the song of the circular arc of the section shape in the width direction of the radial lateral surface 6a and medial surface 6b of bead core 6
Rate radius α 1, α 2 be set as the length L of the width direction of insufficient bead core 6 50% in the case where, that is by outside
In the case that the curvature of face 6a and medial surface 6b are set as excessive, when manufacturing bead core 6, width direction central portion and width side
Difference to the thickness at both ends is excessive, and therefore, it is difficult to manufacture bead core 6.On the other hand, by the radial lateral surface of bead core 6
Radius of curvature α 1, the α 2 of the circular arc of section shape in the width direction of 6a and medial surface 6b are set as the width than bead core 6
In the case that the 150% of the length L in direction is big, the curvature of lateral surface 6a and medial surface 6b are that is being set as too small
In the case of, it is virtually impossible to it obtains when inhibiting sulfidization molding brought by the curved surface for making lateral surface 6a and medial surface 6b become convex
The effect that bead core 6 deforms.Thus, it is preferable to cuing open in the width direction of the radial lateral surface 6a and medial surface 6b of bead core 6
Radius of curvature α 1, the α 2 of the circular arc of face shape be set as described above the 50% of the length L of the width direction of bead core 6 with
It is upper and 150% or less.
As previously mentioned, by by rubber-coated 9 relative to bead core sectional area area ratio be set as 65% or more and
75% hereinafter, so as in two radially to adjoin each other piece steel bead wire 8 of the width direction of bead core 6 and bead core 6
Between fully ensure filling rubber-coated 9 gap.Therefore, rubber-coated 9 rubber when can prevent because of sulfidization molding
Flow it is bad cause two adjacent steel bead wires 8 to contact with each other, and ensure steel bead wire 8 relative to rubber-coated 9 bonding
Property.Thus, it can be also effectively prevented by area setting or inhibit carrying out what sulfidization molding obtained to the green tire
Bead core is caused to break down with the separation of steel bead wire 8 due to rubber-coated 9 in pneumatic tire.
Ensure good rubber flowing when sulfidization molding, preferably minimum interval A wider.But if minimum interval A
It is wide, then it, so that the rigidity whole as bead core 6 is lower, can be easy in the pneumatic tire obtained by sulfidization molding
It deforms because of traveling, the durability of the failure relative to other modes can be reduced.As previously mentioned, by by minimum interval A
It is set as 0.52 times or more of the diameter D of bead core 6 and 0.73 times hereinafter, good rubber flow when can take into account sulfidization molding
The rigidity of bead core in the dynamic and pneumatic tire that is obtained by sulfidization molding ensures.
Ensure good rubber flowing when sulfidization molding, preferably minimum interval B wider.But if minimum interval B
It is wide, then it can be in the pneumatic tire obtained by sulfidization molding, so that the rigidity whole as bead core 6 is lower.In addition,
It if minimum interval B is wide, will lead to when the pneumatic tire obtained by sulfidization molding is installed on wheel rim, be located at tire
The steel bead wire 8 for enclosing the radial outside of core 6 is configured at position significantly far from wheel rim.The configuration can also be reduced relative to other
The durability of the failure of mode.As previously mentioned, by 0.41 times or more of the diameter that minimum interval B is set as to bead core D and
0.63 times hereinafter, the pneumatic tire that good rubber when can take into account sulfidization molding is flowed and obtained by sulfidization molding
In the rigidity of bead core ensure.
By the way that the shortest distance C from the most adjacent steel bead wire 8 of the appearance profile with bead core 6 to appearance profile is set
Shortest distance C is fully ensured for 1/2 more than minimum interval A, is drawn so as to prevent rubber when sulfidization molding from flowing
The steel bead wire 8 most adjacent with the appearance profile of bead core 6 and the contact of casingply 5 risen, and ensure bead core 6 and tire
The cementability of body casing ply 5.
(evaluation test)
The pneumatic tire for carrying out sulfidization molding about the green tire 1 to comparative example 1 and embodiment 1 and manufacturing, has carried out bead core
The evaluation test of durability.
The green tire 1 of comparative example 1 is the illustrated green tire of Fig. 4, and the green tire 1 of embodiment 1 is the illustrated green tire of Fig. 1, also
It is embodiments of the present invention.In the green tire 1 of comparative example 1, the lateral surface 6a and medial surface 6b of bead core 6 are flat surfaces.?
In the green tire 1 of embodiment 1, the lateral surface 6a and medial surface 6b of bead core 6 are the curved surfaces of convex, the width direction of bead core 6
Section shape is that radius of curvature α 1, α 2 are 5mm or more and 15mm arc-shaped below.In addition, the green tire 1 in embodiment 1 is had
In standby bead core 6, radius of curvature α 1, α 2 are 50% or more and 150% or less of the length L of the width direction of bead core 6.It closes
In the specification of bead core 1 be common in comparative example 1 and embodiment 1.Especially, about any of comparative example 1 and embodiment 1
One side, steel bead wire 8 is 7 in the width direction of bead core 6, in bead core 6 is radially 8.
It is pneumatic tire to be installed on to 2t fork truck, and use until completely worn out as evaluation method.Pneumatic tire
Size is 7.00-12, and size rim is 12 × 7.00, and air pressure is 1000kPa.It confirmed using to the tyre bead after completely worn out
Core has fault-free.
In the pneumatic tire manufactured by the green tire 1 of comparative example 1, the failure that bead core 6 has occurred on the way is being used.With this
Relatively, it in the pneumatic tire manufactured by the green tire 1 of embodiment 1, also does not find to damage in bead core 6 after use.
Claims (4)
1. a kind of green tire has the bead core for the inner-diameter end for being located at a pair of sidewall portion,
The bead core has:
More steel bead wires, width direction and institute in the section of the width direction of the bead core, in the bead core
State the radially interval configuration of bead core；And
It is rubber-coated, it is filled between the more steel bead wires,
Radially outside is convex to the radial lateral surface of the bead core in the section of the width direction of the bead core,
Radially inside is convex to the radial medial surface of the bead core in the section of the width direction of the bead core.
2. green tire according to claim 1, which is characterized in that
The section shape of the width direction of the bead core of the lateral surface is that radius of curvature is 5mm or more and 15mm is below
Arc-shaped,
The section shape of the width direction of the bead core of the medial surface is that radius of curvature is 5mm or more and 15mm is below
Arc-shaped.
3. green tire according to claim 1, which is characterized in that
The section shape of the width direction of the bead core of the lateral surface is the width side that radius of curvature is the bead core
To length 50% or more and 150% arc-shaped below,
The section shape of the width direction of the bead core of the medial surface is the width side that radius of curvature is the bead core
To length 50% or more and 150% arc-shaped below.
4. a kind of manufacturing method of pneumatic tire manufactures bead core by the way that shoestring to be repeatedly wound in longitudinal layered laminate,
Wherein, the shoestring is aligned more bead cores in a row with rubber-coated cladding and forms, and the thickness of width direction central portion
Spend thicker than the thickness at width direction both ends, the radial lateral surface of the bead core is cutd open in the width direction of the bead core
Radially outside is convex, the radial medial surface of bead core court in the section of the width direction of the bead core in face
Radial outside is convex,
Sulfidization molding is carried out to the green tire for having the bead core.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-233252 | 2017-12-05 | ||
| JP2017233252A JP2019098991A (en) | 2017-12-05 | 2017-12-05 | Green tire and manufacturing method of pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109927490A true CN109927490A (en) | 2019-06-25 |
| CN109927490B CN109927490B (en) | 2021-04-27 |
Family
ID=66975574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811396858.9A Active CN109927490B (en) | 2017-12-05 | 2018-11-22 | Green tire and method for manufacturing pneumatic tire |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2019098991A (en) |
| CN (1) | CN109927490B (en) |
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| CN106427409A (en) * | 2015-08-12 | 2017-02-22 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN106553491A (en) * | 2015-09-28 | 2017-04-05 | 东洋橡胶工业株式会社 | Pneumatic tire |
| CN106585289A (en) * | 2015-10-14 | 2017-04-26 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN106827606A (en) * | 2015-12-07 | 2017-06-13 | 东洋橡胶工业株式会社 | Bead member manufacture method |
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| Publication number | Publication date |
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| JP2019098991A (en) | 2019-06-24 |
| CN109927490B (en) | 2021-04-27 |
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