CN108297624A - Heavy duty pneumatic vehicle tire - Google Patents
Heavy duty pneumatic vehicle tire Download PDFInfo
- Publication number
- CN108297624A CN108297624A CN201711443232.4A CN201711443232A CN108297624A CN 108297624 A CN108297624 A CN 108297624A CN 201711443232 A CN201711443232 A CN 201711443232A CN 108297624 A CN108297624 A CN 108297624A
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- CN
- China
- Prior art keywords
- cord
- tire
- outside
- outer end
- heavy duty
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011324 bead Substances 0.000 claims abstract description 95
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 230000002787 reinforcement Effects 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 229920001778 nylon Polymers 0.000 claims description 9
- 210000003754 fetus Anatomy 0.000 abstract description 6
- 241000254043 Melolonthinae Species 0.000 description 11
- 230000032798 delamination Effects 0.000 description 11
- 239000003292 glue Substances 0.000 description 10
- 239000004744 fabric Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229920002978 Vinylon Polymers 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000013040 rubber vulcanization Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C15/0628—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The heavy duty pneumatic vehicle tire of the present invention, improves the durability of bead part.The heavy duty pneumatic vehicle tire has carcass (6), the carcass (6)：It include the return portion (6b) for reaching the main part (6a) of the bead core (5) of bead part (4) via side of sidewall portion (3) from fetus face (2) and connecting with main part (6a) and turning back around bead core (5).In tyre equatorial section, it is provided in bead part (4)：First reinforces cord (10), and the layer of the steel cord extended with substantially U-shaped from the tire radial direction inner side of return portion (6b) towards tire radial outside by least part is constituted；Second reinforces cord (11), and the layer of at least one piece organic fiber cord radially extended along tire on the outside of the tire axial of the first reinforcement cord (10) by least part is constituted.It is 30~50/50mm that second cord for reinforcing every 50mm cords width of cord (11), which is embedded to radical that is, density,.
Description
Technical field
The present invention relates to the heavy duty pneumatic vehicle tires for being installed on the load-carrying vehicles such as truck, bus.
Background technology
It is installed on the heavy duty pneumatic vehicle tire of the heavy vehicles such as truck, bus, it is prodigious negative due to needing to support
It carries, therefore especially easy tos produce damage in bead part.In the past in order to improve the durability of bead part, it is proposed that various in tyre bead
Portion is provided with the heavy duty pneumatic vehicle tire of enhancement layer.
For example, in the bead part of patent document 1 and the heavy duty pneumatic vehicle tire of patent document 2, with carcass ply point
Body it is provided with：Steel cord cord is extended around bead core with section U-shaped；Organic fiber cord cord, in the steel curtain
It is radially extended along tire on the outside of the tire axial of line cord.According to the composition of such bead part, when tire bears load
The deformation of bead part is disperseed, and then expects to improve the effect of the durability of bead part.
Patent document 1：Japanese Unexamined Patent Publication 11-020421 bulletins
Patent document 1：Japanese Unexamined Patent Publication 2015-123942 bulletins
However, organic fiber cord cord be configured to include：The organic fiber cord that is actually arranged in parallel and by its
The rubberizing of covering.Various experiments as a result, inventors is made to recognize that if the arranging for adjusting above-mentioned organic fiber cord cord is close
It spends (density of so-called cord), then can intentionally improve the durability of bead part.
Invention content
The present invention is made in view of above actual conditions, and the main one kind that is designed to provide can improve tyre bead
The heavy duty pneumatic vehicle tire of the durability in portion.
The heavy duty pneumatic vehicle tire of the present invention, with the carcass being made of the layer of body cord, which includes：
The main part of the bead core of bead part is reached via side of sidewall portion from fetus face and is connect with the main part and around the tire
The return portion that circle core is turned back from tire axial Inside To Outside, which is characterized in that, in tire meridian
In line section, it is provided in the bead part：First reinforces cord, and the tire by least part from the return portion is radial
The layer of inside towards the steel cord that tire radial outside is extended with substantially U-shaped is constituted；And second reinforce cord, by least
At least one piece of organic fiber cord that a part radially extends on the outside of the tire axial of the first reinforcement cord along tire
Layer is constituted, and it is 30~50/50mm that the described second cord for reinforcing every 50mm cords width of cord, which is embedded to radical that is, density,.
The present invention other modes in, it is described second reinforce cord the organic fiber cord can be 940/1~
The nylon fiber cord of 1400/1dtex.
In the other modes of the present invention, the described second density for reinforcing cord can be more than described first and reinforce cord
Density.
In the other modes of the present invention, the second reinforcement cord may include：It is adjacent to reinforce cord with described first
Inside second reinforce cord and be configured at the inside second reinforce cord tire axial on the outside of outside second reinforce curtain
Cloth.
In the other modes of the present invention, the organic fiber cord of cord is reinforced relative to described in the inside second
Body cord can be tilted with 40 degree~80 degree of angle [alpha] 1, and the organic fiber cord phase of cord is reinforced in the outside second
For the body cord with 40 degree~80 degree of angle [alpha] 2, to the organic fiber curtain for reinforcing cord with the inside second
The opposite direction of line tilts.
In the other modes of the present invention, the organic fiber cord of cord and the outside are reinforced in the inside second
Second angle of the crossing θ for reinforcing the organic fiber cord of cord can be 80 degree~160 degree.
In the other modes of the present invention, the outer end that the tire radial direction of cord is reinforced in the inside second can be located at than institute
The outer end for stating the tire radial direction that cord is reinforced in outside second is leaned at tire radial direction inner side.
In the other modes of the present invention, the outer end of cord is reinforced in the inside second and the outside second is reinforced
The distance of tire radial direction between the outer end of cord can be 8mm~18mm.
In the other modes of the present invention, the outer end that the tire radial direction of cord is reinforced in the inside second can be located at than institute
The outer end of the tire radial direction of return portion is stated at tire radial outside.
In the other modes of the present invention, the described of the outer end and the return portion of cord is reinforced in the inside second
The distance of tire radial direction between outer end can be 8mm~18mm.
It is provided in tyre equatorial section in the bead part of the heavy duty pneumatic vehicle tire of the present invention：By with substantially
The first wheel reinforced cord and reinforce cord described first by least part that the layer for the steel cord that U-shaped extends is constituted
The second reinforcement cord that the layer of the axially external at least one piece organic fiber cord radially extended along tire of tire is constituted.According in this way
Bead part reinforcement construction, when tire running the deformation of bead part disperseed, to improve the durability of bead part.
In addition, the cord of every 50mm cords width is embedded to radical with the second reinforcement cord that is, density is adjusted to 30~50
Root/50mm, therefore the second binding force for reinforcing the bead part that cord is realized is optimized, and then further increase bead part
Durability.
Description of the drawings
Fig. 1 is the sectional view of the heavy duty pneumatic vehicle tire of an embodiment of the invention.
Fig. 2 is the side view of the bead part of Fig. 1.
Fig. 3 is the enlarged drawing of the major part of the bead part of Fig. 1.
Fig. 4 is the enlarged drawing of the major part of Fig. 2.
Reference sign：2 ... fetus faces；3 ... side of sidewall portion；4 ... bead parts；5 ... bead cores；6 ... carcasses；6A ... carcasses
Cord；6a ... main parts；6b ... return portions；10 ... first reinforce cord；11 ... second reinforce cord；The insides 11A ... second add
Strong cord；Reinforce cord in the outsides 11B ... second；C1 ... body cords；C2 ... steel cords；C3, c4 ... organic fiber cord.
Specific implementation mode
Hereinafter, being illustrated to an embodiment of the invention based on attached drawing.
Fig. 1 shows the normal state of the heavy duty pneumatic vehicle tire (hereinafter, sometimes referred to simply as " tire ") 1 of present embodiment
Under the tyre equatorial sectional view including rotary shaft.
" normal state " is tyre rim to be assembled in regular wheel rim R, and uncharge shape filled with regular internal pressure
State.Hereinafter, in the case of not specified, the size etc. in each portion of tire is the value determined under the normal state.
" regular wheel rim " is to provide the rule to each tire in the schematism including specification based on tire
The wheel rim of lattice, for example, if JATMA then be " standard rim ", if TRA then be " DesignRim ", be then if ETRTO
“Measuring Rim”。
" regular internal pressure " is to provide each rule to each tire in the schematism including specification based on tire
The air pressure of lattice, it is then table " TIRE LOAD LIMITS AT VARIOUS if TRA to be then if JATMA " highest air pressure "
Maximum value recorded in COLD INFLATION PRESSURES " is then " INFLATION PRESSURE " if ETRTO.
As shown in Figure 1, the tire 1 of present embodiment has：The tire of bead part 4 is reached via side of sidewall portion 3 from fetus face 2
Enclose the cricoid carcass 6 of core 5.Carcass 6 is formed by least one piece of carcass ply, in the present embodiment by one piece of carcass ply 6A
It is formed.
Carcass ply 6A includes main part 6a and return portion 6b.Main part 6a reaches tire from fetus face 2 via side of sidewall portion 3
The bead core 5 in circle portion 4.Return portion 6b is connect with main part 6a, is turned back from tire axial Inside To Outside around bead core 5, and
Tire radial outside has outer end 9.The height H1 on the basis of tyre bead baseline BL of the main part 6a of carcass ply 6A is in tire
Equator C is nearby maximum.
Fig. 2 shows the side views of bead part 4, herein it will be appreciated that in a manner of in-built, to peel main rubber section
Point.As shown in Fig. 2, carcass ply 6A be preferably body cord c1 relative to tire radiation direction (radial direction) with 0~20 degree
Angle tilt, in the present embodiment substantially with 0 degree arrange.In addition, it is above-mentioned " substantially " be consider tire 1 be rubber
Vulcanization forming product and the case where be not complete straight line in view of steel cord and how much generate error.
In addition, in order to ensure tire intensity, body cord c1 is made of steel cord.In addition, in order to obtain the basic of tire
Intensity, in carcass ply 6A, the arranging density of body cord c1, i.e., cord embedment radical per 50mm cord width that is,
Density is preferably 26~40/50mm or so.The rolling resistance of tire 1 with such carcass ply 6A is smaller, Neng Gouyou
Help the low oil consumption of vehicle.
As shown in Figure 1, carcass 6 radial outside and the inside of fetus face 2 be configured with belt 7.Belt 7
Such as the multiple belt plies for having used steel cord are overlapped and are constituted.The belt 7 of present embodiment is for example by the first~the 4th
Belt ply 7A~7D is formed, but is not limited to such mode.
It is provided in bead part 4：The bead apex 8 that is extended with tapered from bead core 5 towards tire radial outside, by
The first of the layer composition of steel cord for reinforced bead portion 4 reinforces cord 10, by the organic fiber curtain for reinforced bead portion 4
The second reinforcement cord 11 that the layer of line is constituted and the chafer rubber 12 being connect with the wheel rim seat surface R1 of regular wheel rim R.
Fig. 3 shows the enlarged drawing of the bead part 4 of Fig. 1.As shown in figure 3, bead core 5 is for example with by the steel bead wire of steel
It is wound as the cross sectional shape of the polygonal shape of multiple row multilayer.The bead core 5 of present embodiment is for example with substantially hexagon shape
The cross sectional shape of shape.Bead core 5 includes：The lateral surface 5a that extends along tire axial in tire radial outside and in tire radial direction
The medial surface 5b that inside extends along tire axial.
In normal state and regular load is loaded to the normal state and the standard termination for being outside one's consideration inclination angle ground connection with 0 loads shape
Under state, the wheel rim seat surface R1 angulations β of the medial surface 5b of bead core 5 and regular wheel rim R is preferably 0 degree ± 3 degree.With this
The tire 1 of the bead core 5 of sample inhibits the rotation (rotation) of bead core 5 in driving process, in the carcass ply 6A of bead part 4
Pulling force become smaller, as a result, improve bead durability.
Here, above-mentioned " regular load " is in the schematism including specification based on tire, to each wheel
Tire provides the load of each specification, is then " maximum load ability " if JATMA, is then table " TIRE LOAD LIMITS if TRA
Maximum value recorded in AT VARIOUS COLD INFLATION PRESSURES " is then " LOAD if ETRTO
CAPACITY”。
In the case where tire 1 is to be installed on the tubeless type of regular wheel rim R (15 degree of taper wheel rims), above-mentioned tire
1 for example using the bead core of specific shape, so as to manufacture.As such bead core, such as before being assembled in tire
Under state, the inclination in the direction that medial surface 5b is become larger with internal diameter towards tire axial outside, and have relative to tire axial
About 20 degree of angle.In addition, 15 degree of taper wheel rims be wheel rim seat surface R1 on the inside of tire axial towards outside and to tire diameter
Outward with the wheel rim of the angle tilt of substantially 15 degree.
Bead core 5 is for example with the core main body 5A being made of steel bead wire.It is for example preferably provided with around core main body 5A
There is the clad 5B of covering core main body 5A.Clad 5B is such as canvas (Canvas cloth) structure of the organic fiber by nylon
At bundle steel bead wire is fixed.
The bead apex 8 of present embodiment for example including：Triangle ID glue 8A and the tire diameter for being configured at Triangle ID glue 8A
Outer triangle rubber 8B outward.
Triangle ID glue 8A for example between the main part 6a and return portion 6b of carcass ply 6A from bead core 5 to tire
The cross sectional shape for the roughly triangular shape that radial outside extends.The outer end 13 of the tire radial direction of Triangle ID glue 8A, such as positioned at tire
On the tire axial lateral surface of the main part 6a of body cord 6A.The outer end 13 of Triangle ID glue 8A is for example preferably placed at than return portion 6b
Outer end 9 at the tire radial outside.The complex modulus E*1 of Triangle ID glue 8A is preferably set to 40~65MPa.
In the present specification, the complex modulus for constituting the rubber material of tire is to use viscoelastic spectrometer, in temperature
The value determined under conditions of 70 DEG C, frequency 10Hz, initial strain 10% and dynamic strain 2%.
Outer triangle rubber 8B is for example via the side extended from the outer end 13 of Triangle ID glue 8A towards return portion 6b to radially inner side
Interface 14 and connect with Triangle ID glue 8A.The complex modulus E*2 of outer triangle rubber 8B is preferably less than the multiple bullet of Triangle ID glue 8A
Property modulus E*1.The complex modulus E*2 of especially outer triangle rubber 8B is for example preferably 3~5MPa.
The bead apex 8 constituted as described above ensures sufficient bending stiffness when bead part 4 deforms, and can
The shear stress for mitigating the return portion 6b that carcass ply 6A is acted in the outer triangle rubber 8B of low elasticity, so as to effectively
Anti- delamination equivalent damage.
First reinforcement cord 10 is formed by least one piece, is formed in the present embodiment by one piece.First reinforces cord 10
The bending stiffness of bead part 4 can be improved, so effectively inhibit with bead core 5 for fulcrum bead part 4 to outside tire axial
The larger flexural deformation of side.This contributes to the deformation for reducing bead part.
First reinforces cord 10 in tyre equatorial section, at least partially from the tire radial direction inner side court of return portion 6b
Extended to tire radial outside with substantially U-shaped.The first of present embodiment reinforces cord 10 for example, at least a part and main body
Portion 6a and return portion 6b connections.Such first reinforcement cord 10 not excessively improves on the outside of the tire axial of bead part 4
Rigidity, to effectively improve riding comfort.But the configuration of the first reinforcement cord 10 is not limited to such mode.
First reinforces the outer end 15 of the tire axial of cord 10 for example positioned at the outer end 9 than return portion 6b in tire radial direction
At lateral extent L1.Thereby, it is possible to inhibit deformation to concentrate near the outer end 15 of the first reinforcement cord 10.Therefore can inhibit with this
Outer end 15 is the delamination equivalent damage of starting point.
Above-mentioned distance L1 is for example preferably 8~18mm.In the case where above-mentioned distance L1 is less than 8mm, reinforce first
Poor rigidity at the outer end 15 of cord 10 becomes larger, it is possible to produce with the outer end 15 is the delamination equivalent damage of starting point.It is above-mentioned away from
In the case of being more than 18mm from L1, it is possible to the bending stiffness of bead part 4 can not be effectively improved.
Tire diameter is for example leaned in first inner end 16 for reinforcing the tire axial of cord 10 positioned at the outer end 13 than Triangle ID glue 8A
Inwardly.As further preferred mode, the first inner end 16 for reinforcing cord 10 is located at the outer end for reinforcing cord 10 than first
15 lean on tire radial direction inner side.In such mode, the length of the measuring shape along the first reinforcement cord 10 can be made to compare
It is small, so as to take into account tire lightness and bead part 4 stiffening effect.
As shown in Fig. 2, first reinforcement 10 preferably several steel cord c2 of cord are obliquely configured relative to body cord c1.
When the flexural deformation of the bead part 4 generated during tire running, first reinforce cord 10 so that steel cord c2 angle γ
Increased mode flexible deformation, to inhibit the flexural deformation of bead part 4.In preferred mode, first reinforces cord 10
Steel cord c2 is relative to body cord c1 with 30~70 degree of angle γ oblique arrangement.
In preferred mode, first reinforces the arranging density of the steel cord c2 of cord 10, i.e., per 50mm cord width
Cord is embedded to radical that is, density is 20~40/50mm.Particularly preferably, the first density for reinforcing cord 10 is less than carcass
The density of cloth 6A.In addition, cord width when determining density, measures along the direction orthogonal with the length direction of cord.
As shown in FIG. 2 and 3, second reinforces on the outside of the tire axial that cord 11 reinforces cord 10 first along tire diameter
To extension.Present embodiment second reinforce cord 11 for example including：Reinforce the adjacent inside second of cord 10 with first to reinforce
This two pieces of cord 11B is reinforced in cord 11A and the outside second being configured on the outside of the tire axial of inside the second reinforcement cord 11A.
Cord 11A is reinforced in inside second and the reinforcement cord 11B of outside second is overlapped.In the other modes of the present invention, second
Reinforcing cord 11 can also be constituted by one piece.
As shown in Fig. 2, inside second reinforce cord 11A and outside second and reinforce cord 11B being respectively structured as include：It is flat
The rubberizing g of organic fiber cord c3, c4 and covering organic fiber cord c3, c4 for arranging capablely.In the present embodiment, interior
Cord 11A is reinforced in side second and the respective cord embedment radicals per 50mm cord width of cord 11B are reinforced also in outside second
I.e. density is 30~50/50mm.
The result of the various experiments of inventors specifies：Reinforce by the reinforcement cord 11A of inside second and outside second
In the case that the respective density of cord 11B is set as 30~50/50mm, the durability of bead part 4 is intentionally improved.That is,
In the case that above-mentioned density is less than 30/50mm, the binding force for the bead part 4 that the second reinforcement cord 11 is realized significantly decreases,
Therefore, it is difficult to so that the deformation of the bead part 4 when tire running is fully disperseed or even is reduced.On the other hand, it is more than in above-mentioned density
In the case of 50/50mm, the binding force of the bead part of the second reinforcement cord 11 realization can be improved.However, increasing second
In the case of the density for reinforcing cord 11, unexpectedly there is also the wheel for concentrating on the second reinforcement cord 11 is deformed in tire running
The outer end of tire radial direction is (that is, be that the outer end 17 of cord 11A is reinforced in inside second and curtain is reinforced in outside second in the present embodiment
The outer end 19 of cloth 11B) trend, in turn, there are above-mentioned outer end 17 or 19 become new damage starting point trend.Especially
In preferred mode, above-mentioned density is 40~50/50mm.
Organic fiber cord c3, c4 of second reinforcement cord 11 are not specially limited, but nylon fibre is for example suitably used
Tie up cord, polyester fiber cord, aromatic polyamide fibre cord or high-tension vinylon fiber cord etc..It is such to have
The flexibility of machine fiber cord cord is higher than steel cord cord, and also excellent with the close property of rubber components.
In the present embodiment, nylon fibre is suitably used in organic fiber cord c3, the c4 for reinforcing cord 11 as second
Tie up cord.In the case that the density for especially reinforcing cord 11 second is 30~50/50mm, nylon fiber cord is for example excellent
Select the degree of fineness with 940/1~1400/1dtex.If nylon fiber cord is narrower than 940/1dtex, it is likely that be unable to fully
Ground obtains the effect for the deformation dispersion for making bead part 4.On the contrary, if nylon fiber cord is coarser than 1400/1dtex, it is likely that
The near outer ends of second reinforcement cord 11 generate the starting point of new damage.
The second of the present embodiment constituted as described above reinforces cord 11, and new damage will not be generated in bead part 4
Starting point, can efficiently reduce or even disperse the deformation of bead part 4, and then the durability of bead part 4 is significantly increased.For
Such function and effect are further increased, the second density for reinforcing cord 11 is preferably greater than the close of the first reinforcement cord 10
Degree.
In addition, even if the second temperature for reinforcing the bead part 4 near the wheel rim of for example regular wheel rim R of cord 11 increases
Contribute to influence for inhibiting the chafer rubber 12 being connect with wheel rim seat surface R1 because of heat etc. to soften and flowed on wheel rim, later
Solidification.Therefore bead part 4 can reduce the damage for being cured as cause with rubber.
Second reinforces the outer end 15 that cord 11 reinforces cord 10 from tire axial outer side covering first.As present embodiment that
Sample reinforces cord 11A and 11B for two piece second and is easy to extend and with relative to rubber compared with first reinforces cord 10
Excellent adhesion strength.Therefore the stress at the outer end 15 of the first reinforcement cord 10 is alleviated, and can for a long time be inhibited here
Delamination.
In the present embodiment, the outer end 17 of the tire radial direction of cord 11A is reinforced positioned at than return portion 6b's in inside second
Outer end 9 is at tire radial outside distance L2.The outer end 9 of cord 11A covering return portions 6b is reinforced in inside second as a result,.Therefore
Second reinforce cord 11 can abirritation in the shear stress of the return portion 6b of carcass ply 6A, so as to reduce with cutting
The deformation of shearing stress.In addition, the second reinforcement cord 11 can also be effectively inhibited with the outer end 9 of return portion 6b as the de- of starting point
Layer.
Above-mentioned distance L2 is for example preferably 8~18mm.In the case where above-mentioned distance L2 is less than 8mm, in carcass ply 6A
Outer end 9 at poor rigidity increase, it is possible to causing the delamination equivalent damage with outer end 9 for starting point.If distance L2 is more than
18mm, then in tire running, inside second reinforces cord 11A and is easy movement, is reinforced with inside second it is possible to generating
The outer end 17 of cord 11A is the delamination equivalent damage of starting point.
Outer end 17 and the 9 distance L2 of the outer end of return portion 6b that cord 11A is reinforced in inside second is preferably and return portion 6b
Outer end 9 and first reinforce cord 10 15 distance L1 of outer end it is roughly equal.The stress of bead part 4 is uniformly dispersed as a result,
Further increase durability.
The inner end 18 of tire radial direction of cord 11A is reinforced in inside second, be located at the outer end 15 than the first reinforcement cord 10 with
And inner end 16 is at tire radial direction inner side.The inner end 18 that cord 11A is reinforced in inside second is preferably located at than aftermentioned outside the
Two reinforce the inner end 20 of cord 11B at tire axially inner side.Thus inhibit deformation to concentrate on inside second and reinforce cord 11A's
Near inner end 18.Therefore can inhibit to reinforce the inner end 18 of cord 11A with inside second as the delamination equivalent damage of starting point.
The outer end 19 of the tire radial direction of cord 11B is reinforced in outside second, such as reinforces cord 11A's positioned at than inside second
Outer end 17 is at tire radial outside distance L3.The 11B coverings of the second reinforcement cord of outside are easy to be drawn by carcass ply 6A as a result,
Reinforce the outer end 17 of cord 11A in the inside second of the influence of power.Therefore it effectively inhibits and the outer of cord 11A is reinforced with inside second
End 17 is the delamination of starting point.
Above-mentioned distance L3 is for example preferably 8~18mm.In the case where above-mentioned distance L3 is less than 8mm, add in inside second
Poor rigidity at the outer end 17 of strong cord 11A increases, it is possible to the outer end 17 that cord 11A is reinforced in generation with inside second is
The delamination equivalent damage of starting point.In the case where distance L3 is more than 18mm, in tire running, outside second is reinforced cord 11B and is held
It is easily mobile, the outer end 19 of cord 11B is reinforced as the delamination equivalent damage of starting point with outside second it is possible to generating.
The 17 distance L3 of outer end of the outer end 19 and the reinforcement cord 11A of inside second of cord 11B is reinforced in outside second, preferably
It is roughly equal for the outer end 17 and 9 distance L2 of the outer end of return portion 6b of reinforcing cord 11A with inside second.Above-mentioned bead part
4 make stress be uniformly dispersed, to further increase durability.
Reinforce the height H2 of the tire radial direction of the outer end 19 of cord 11B from tyre bead baseline BL to outside second, such as preferably
It is the 25%~40% of the maximum height H1 of the carcass ply 6A on the basis of tyre bead baseline BL.Height H2 in above-mentioned outer end 19
In the case of 25% of maximum height H1 less than carcass ply 6A, it is possible to inhibit chafer rubber 12 in regular wheel rim R
Wheel rim on flowing, cured effect becomes smaller.If the 40% of maximum height H1s of the height H2 of outer end 19 more than carcass ply 6A,
Then the easy movements of cord 11B are reinforced in outside second, it is possible to the outer end 19 that cord 11B is reinforced in generation with outside second is
The delamination equivalent damage of point.
The inner end 20 of the tire radial direction of cord 11B is reinforced in the outside second of present embodiment, is located at the tire diameter of bead core 5
In inside region S1 inwardly.Even if the feelings that cord 11B produces pulling force in carcass ply 6A are reinforced in such outside second
It under condition, will not substantially move, the pulling force of carcass ply 6A can be effectively inhibited.Therefore tire 1 inhibits with carcass ply
The deformation of the pulling force of 6A, to inhibit to be deformed into the rupture equivalent damage of reason.As a result, further increasing the resistance to of bead part 4
Long property.
The 18 distance L4 of inner end of the inner end 20 and the reinforcement cord 11A of inside second of cord 11B is reinforced in outside second, preferably
17 distance L3 of outer end for outer end 19 and the reinforcement cord 11A of inside second with the reinforcement cord 11B of outside second is roughly equal.
That is, outside second reinforces cord 11B and inside second to reinforce cord 11A along the length of its measuring shape being preferably substantially phase
Together.The cord 11B and reinforcement cord 11A of inside second is reinforced in outside second as a result, can for example use identical casing ply.This has
Help the common of promoting member, cuts down manufacturing cost.
As shown in Fig. 2, each organic fiber cord c3 of cord 11A is reinforced preferably relative to body cord c1 in inside second
It is tilted to first direction with 40 degree~80 degree, more preferably with 50 degree~70 degree of angle [alpha] 1.Reinforce curtain in such inside second
Cloth 11A can effectively inhibit the pulling force of carcass ply 6A.
Outside second reinforce each organic fiber cord c4 of cord 11B preferably also relative to body cord c1 with 40 degree~
80 degree, more preferably with 50 degree~70 degree of 2 oblique arrangement of angle [alpha].In particularly preferred mode, cord is reinforced in outside second
The organic fiber cord c4 of 11B is tilted to the opposite directions the organic fiber cord c3 of cord 11A are reinforced with inside second.In this way
Outside second reinforce cord 11B and can effectively inhibit the pulling force of carcass ply 6A.
The angle [alpha] 1 of the organic fiber cord c3 of cord 11A is reinforced in inside second and having for cord 11B is reinforced in outside second
The angle [alpha] 2 of machine fiber cord c4 is preferably actually equal.Cord 11A is reinforced in such inside second and outside second adds
Strong cord 11B, more effectively disperses the strain when flexural deformation of bead part 4, to improve the durability of bead part.
In particularly preferred mode, as Fig. 4 amplifications indicate, the organic fiber of cord 11A is reinforced in inside second
The angle of the crossing θ that cord c3 reinforces the organic fiber cord c4 of cord 11B with outside second is preferably 80 degree~160 degree.Above-mentioned
In the case that angle of the crossing θ is more than 160 degree, relative to carcass ply 6A, the bending stiffness of the second reinforcement cord 11 significantly decreases,
In turn, deformation is easy to concentrate on the outer end 9 of the return portion 6b of carcass ply 6A, is easy to cause the damage of cord anti-package loosening etc
Wound.
Cord 11A is reinforced in above-mentioned inside second and cord 11B is reinforced in outside second, such as can make during fabrication same
The positive and negative reversion of one cord uses, to be easy to carry out.Cord 11A is reinforced in inside second as a result, and curtain is reinforced in outside second
Cloth 11B can make component common, so as to cut down the manufacturing cost of tire 1.
Chafer rubber 12 is located on the outside of the tire axial that second reinforces cord 11, and in the tire of bead core 5 radial direction
Inside is connect with the wheel rim seat surface R1 of regular wheel rim R.The outer end 21 of the tire radial direction of chafer rubber 12, such as positioned at than outer
Reinforce the outer end 19 of cord 11B at tire radial outside in side second.
Minimum thickness t1 at the tire axial outer fix of the bead core 5 of chafer rubber 12 is preferably 2.5~
6.0mm.If minimum thickness t1 is less than 2.5mm, it is likely that so that chafer rubber 12 is cured, so as to cause rupture equivalent damage.
If minimum thickness t1 is more than 6.0mm, it is likely that so that chafer rubber 12 is flowed on the wheel rim of regular wheel rim R, thus
Surface of tyre is deformed.
The complex modulus E*3 of chafer rubber 12 is preferably 7~14MPa, is more preferably set as 9~13MPa.If multiple
Elastic modulus E * 3 is less than 7MPa, it is likely that so that chafer rubber 12 is flowed on the wheel rim of regular wheel rim R, to take turns
Tire surface is deformed.If complex modulus E*3 is more than 14MPa, it is likely that so that chafer rubber 12 is cured, cause to rupture
Equivalent damage.
More than, the heavy duty pneumatic vehicle tire of an embodiment of the invention is explained in detail, but this hair
It is bright to be not limited to above-mentioned specific embodiment, it is self-evident to be changed to various modes to implement.
Embodiment
The heavy load inflated wheel that the size of essential structure of the specification trial-production with Fig. 1 based on table 1 is 295/80R22.5
Tire, and test their bead durability.The common specification and test method of each test tire are as follows.
＜ carcasses ＞
The specification of body cord：Steel cord
The angle of body cord：0 degree (relative to tire radiation direction)
The density of body cord：20/50mm
＜ first reinforces cord ＞
Cord number：1
First reinforces the specification of cord：Steel cord
First reinforces the angle of the steel cord of cord：65 degree (relative to body cords)
First reinforces the density of the steel cord of cord：28/50mm
Distance L1：13mm
＜ second reinforces cord ＞
Cord number：2
Second reinforces the specification of cord：Nylon fiber cord 1400/1dtex
Distance L2：13mm
Distance L3：13mm
H2/H1=30%
＜ bead durabilities test ＞
Above-mentioned test tire is installed on to 22.5 × 9.00 wheel rim, the 200% of internal pressure 850kPa and standard termination
Under conditions of, it is travelled, is determined until the row until bead part generates damage with the speed of 20km/h on drum tester
Sail the time.As a result indicate that numerical value is bigger, indicate that the durability of bead part is more excellent with the value of comparative example 1 for 100 index.
Test result is shown in table 1.
Table 1
The result of test is able to confirm that the tire of embodiment intentionally improves the durability of bead part.
Claims (10)
1. a kind of heavy duty pneumatic vehicle tire, with the carcass being made of the layer of body cord, which includes：From tyre surface
Portion the main part of the bead core of bead part is reached via side of sidewall portion and connect with the main part and around the bead core from
The return portion that tire axial Inside To Outside is turned back, the heavy duty pneumatic vehicle tire be characterized in that,
In tyre equatorial section, it is provided in the bead part：
First reinforces cord, by least part from the tire radial direction inner side of the return portion towards tire radial outside with big
The layer of the steel cord of U-shaped extension is caused to constitute；And
Second reinforces cord, is radially extended along tire on the outside of the tire axial of the first reinforcement cord by least part
At least one piece organic fiber cord layer constitute,
It is 30~50/50mm that described second cord for reinforcing every 50mm cords width of cord, which is embedded to radical that is, density,.
2. heavy duty pneumatic vehicle tire according to claim 1, which is characterized in that
The nylon fiber cord that described second organic fiber cord for reinforcing cord is 940/1~1400/1dtex.
3. heavy duty pneumatic vehicle tire according to claim 1 or 2, which is characterized in that
Described second density for reinforcing cord is more than the described first density for reinforcing cord.
4. the heavy duty pneumatic vehicle tire according to any one of claims 1 to 3, which is characterized in that
Described second, which reinforces cord, includes：Reinforce cord and be configured at institute in the inside second adjacent with the first reinforcement cord
It states the outside second that inside second is reinforced on the outside of the tire axial of cord and reinforces cord.
5. heavy duty pneumatic vehicle tire according to claim 4, which is characterized in that
The organic fiber cord of the reinforcement of the inside second cord is relative to the body cord with 40 degree~80 degree of angle
α 1 is spent to tilt,
The organic fiber cord of the reinforcement of the outside second cord is relative to the body cord with 40 degree~80 degree of angle
α 2 is spent, is tilted to the opposite direction of the organic fiber cord of cord is reinforced with the inside second.
6. heavy duty pneumatic vehicle tire according to claim 5, which is characterized in that
Reinforce organic fibre of the organic fiber cord and the reinforcement of the outside second cord of cord in the inside second
The angle of the crossing θ for tieing up cord is 80 degree~160 degree.
7. the heavy duty pneumatic vehicle tire according to any one of claim 4~6, which is characterized in that
The outer end that the tire radial direction of cord is reinforced in the inside second is located at the tire radial direction for reinforcing cord than the outside second
Outer end at the tire radial direction inner side.
8. heavy duty pneumatic vehicle tire according to claim 7, which is characterized in that
Reinforce the tire between the outer end of cord and the outer end of the reinforcement of the outside second cord in the inside second
Radial distance is 8mm~18mm.
9. the heavy duty pneumatic vehicle tire according to any one of claim 4~8, which is characterized in that
Reinforce outer end roller of the outer end positioned at the tire radial direction than the return portion of the tire radial direction of cord in the inside second
At tire radial outside.
10. heavy duty pneumatic vehicle tire according to claim 9, which is characterized in that
Reinforce the outer end of cord at a distance from the tire radial direction between the outer end of the return portion in the inside second
For 8mm~18mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017003878A JP7024185B2 (en) | 2017-01-13 | 2017-01-13 | Pneumatic tires for heavy loads |
| JP2017-003878 | 2017-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108297624A true CN108297624A (en) | 2018-07-20 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711443232.4A Pending CN108297624A (en) | 2017-01-13 | 2017-12-27 | Heavy duty pneumatic vehicle tire |
Country Status (2)
| Country | Link |
|---|---|
| JP (2) | JP7024185B2 (en) |
| CN (1) | CN108297624A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7283617B1 (en) | 2022-06-24 | 2023-05-30 | 住友ゴム工業株式会社 | Heavy duty tire |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0466311A (en) * | 1990-07-05 | 1992-03-02 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JPH0558120A (en) * | 1991-08-29 | 1993-03-09 | Bridgestone Corp | Tubeless pneumatic radial tire for heavy duty service |
| JPH06328914A (en) * | 1993-05-25 | 1994-11-29 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic radial tire |
| JPH07101212A (en) * | 1993-10-08 | 1995-04-18 | Bridgestone Corp | Pneumatic radial tire for heavy load |
| JP2008110624A (en) * | 2006-10-27 | 2008-05-15 | Bridgestone Corp | Pneumatic tire |
| CN106274300A (en) * | 2015-06-29 | 2017-01-04 | 住友橡胶工业株式会社 | Tyre for heavy load |
| CN106347036A (en) * | 2015-07-14 | 2017-01-25 | 住友橡胶工业株式会社 | Heavy-duty pneumatic tire |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0749242B2 (en) * | 1985-07-01 | 1995-05-31 | 株式会社ブリヂストン | Pneumatic radial tires for heavy loads |
| AU561964B2 (en) * | 1984-11-16 | 1987-05-21 | Bridgestone Corporation | Bead chafer construction |
| JPS62137207A (en) * | 1985-12-11 | 1987-06-20 | Bridgestone Corp | Pneumatic radial tire |
| JP2009101943A (en) | 2007-10-25 | 2009-05-14 | Bridgestone Corp | Heavy load pneumatic tire |
| JP6059422B2 (en) * | 2011-06-09 | 2017-01-11 | 住友ゴム工業株式会社 | Heavy duty pneumatic tire |
| JP6553354B2 (en) | 2014-12-22 | 2019-07-31 | Ｔｏｙｏ Ｔｉｒｅ株式会社 | Pneumatic radial tire |
-
2017
- 2017-01-13 JP JP2017003878A patent/JP7024185B2/en active Active
- 2017-12-27 CN CN201711443232.4A patent/CN108297624A/en active Pending
-
2022
- 2022-01-31 JP JP2022013283A patent/JP7363937B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0466311A (en) * | 1990-07-05 | 1992-03-02 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JPH0558120A (en) * | 1991-08-29 | 1993-03-09 | Bridgestone Corp | Tubeless pneumatic radial tire for heavy duty service |
| JPH06328914A (en) * | 1993-05-25 | 1994-11-29 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic radial tire |
| JPH07101212A (en) * | 1993-10-08 | 1995-04-18 | Bridgestone Corp | Pneumatic radial tire for heavy load |
| JP2008110624A (en) * | 2006-10-27 | 2008-05-15 | Bridgestone Corp | Pneumatic tire |
| CN106274300A (en) * | 2015-06-29 | 2017-01-04 | 住友橡胶工业株式会社 | Tyre for heavy load |
| CN106347036A (en) * | 2015-07-14 | 2017-01-25 | 住友橡胶工业株式会社 | Heavy-duty pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018111434A (en) | 2018-07-19 |
| JP2022050717A (en) | 2022-03-30 |
| JP7363937B2 (en) | 2023-10-18 |
| JP7024185B2 (en) | 2022-02-24 |
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