CN104723804A - Pneumatic radial tire - Google Patents
Pneumatic radial tire Download PDFInfo
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- CN104723804A CN104723804A CN201410795403.XA CN201410795403A CN104723804A CN 104723804 A CN104723804 A CN 104723804A CN 201410795403 A CN201410795403 A CN 201410795403A CN 104723804 A CN104723804 A CN 104723804A
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- tire
- bead
- fabric reinforcement
- tire radial
- rubber cushion
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Abstract
The purpose of the invention is to suppress the increase in tire mass and the occurrence of an air pocket and improve bead portion durability. A pneumatic radial tire comprises a fiber reinforcing layer provided on the outer side of the winding portion of a carcass ply, a metal reinforcing layer provided between the winding portion and the fiber reinforcing layer, a rubber pad between the bead filler and the fiber reinforcing layer. H0 represents distance from the lower end of the rubber pad to the upper end of the metal reinforcing layer, H1 represents the distance from the top edge of the metal reinforcing layer to the turned-up end of the carcass ply, H2 represents the distance from the winding end to the upper end of fiber reinforcing layer, H3 represents the distance between the upper ends of fiber reinforcing layer, H4 represents the distance from the upper end of the rubber pad to the top of fiber reinforcing layer, H1/H0 = 0.80 to 1.0; H2/H4 = 0.60 to 0.90, H3/H4 = 0.80 to 1.0, H0 and H1 are larger than any of the H1 and H4.
Description
Technical field
The present invention relates to a kind of Pneumatic belt tire.
Background technology
For Pneumatic belt tire, especially counterweight load-carrying Pneumatic belt tire, needs the durability improving bead part.In order to improve the durability of bead part, the method rolling the strain of end being reduced carcass plies by the distortion of suppression bead part is very effective.Therefore, roll portion usually along carcass plies, the enhancement Layer (with reference to patent documentation 1) being called chafer is set.
Patent Document 2 discloses following content, as this enhancement Layer, arrange and comprise the steel cord enhancement Layer of steel cord and include the fiber cord enhancement Layer of organic fiber, and make the upper end of steel cord enhancement Layer roll end lower than carcass plies, and make the upper end of fiber cord enhancement Layer roll end higher than this, on this basis, elastomeric compound is set in the inner side of fiber cord enhancement Layer.Also disclose following content in patent documentation 3, as the enhancement Layer of bead part, arrange and comprise the cord reinforcing layer of steel cord and comprise the additional cord layer of fiber cord.
Prior art document:
Patent documentation
Patent documentation 1: Japanese Laid-Open 2013-1223 publication
Patent documentation 2: the clear 63-110006 publication of Japanese Laid-Open
Patent documentation 3: the flat 8-324214 publication of Japanese Laid-Open
Summary of the invention
The problem that invention will solve
As mentioned above, by rolling the metal shielding that around portion, setting comprises steel cord and realizing reinforcement the fabric reinforcement comprising organic fiber cord at carcass plies, thus the strain dispersion rolling end of carcass plies can be made, the durability of bead part can be improved thus.But, multiple enhancement Layer is set like this interval between each component ends then can be made to diminish.Therefore, in Tire production operation, be easily involved in air, and easily produce core in the tire of sulfidization molding.On the other hand, although the generation of core can be suppressed by the interval increased between each component ends, the interval change between each component ends then easily causes the thickness of bead part to increase greatly, and becomes the heavy major cause of tire change.
The present invention proposes in view of the above circumstances, its object is to, and provides one that tire quality can be suppressed to increase, and suppresses the generation of core, and can improve the Pneumatic belt tire of the durability of bead part.
Solve the method for problem
The Pneumatic belt tire of embodiment 1 possesses: bead core, and it is embedded in bead part; Bead filler adhesive tape (bead filler), it is configured in the tire radial outside of described bead core; Carcass plies, it wraps up described bead core and rolls laterally inside tire axial; At least one deck fabric reinforcement, it comprises the organic fiber cord in the outside in the portion that rolls being arranged on described carcass plies; Metal shielding, its comprise be arranged on described in roll metal cords between portion and described fabric reinforcement; And rubber cushion (rubber pad), it for rolling end from carcass plies described in tire axial outer side covers, and is arranged between described bead filler adhesive tape and described fabric reinforcement.Outside the tire axial of described bead core, the upper end of described metal shielding is positioned at rolls the position of end closer to tire radial direction inner side than described, the upper end of described fabric reinforcement is positioned at rolls the position of end closer to tire radial outside than described, the upper end of described rubber cushion is positioned at upper end than described fabric reinforcement closer to the position of tire radial outside, and the lower end of described rubber cushion is arranged between described rolling between portion and described metal shielding.And, using the tire radial distance of lower end to the upper end of described metal shielding from described rubber cushion as H0, using from the upper end of described metal shielding to the described tire radial distance rolling end as H1, using from described end of rolling to there is the tire radial distance of this upper end of fabric reinforcement of upper end nearest in tire radial direction as H2, using from the upper end of described rubber cushion to there is the tire radial distance of this upper end of fabric reinforcement of upper end nearest in tire radial direction as H4, H1/H0 is 0.80-1.0, H2/H4 is 0.60-0.90, and H0 and H1 is all greater than any one in H2 and H4.
With regard to the Pneumatic belt tire of embodiment 2, in described embodiment 1, possesses at least two-layer described fabric reinforcement, using the upper end of described at least two-layer fabric reinforcement tire radial distance each other as H3, H1/H0 is 0.80-1.0, H2/H4 is 0.60-0.90, H3/H4 is 0.80-1.0, and H0 and H1 is all greater than any one in H2, H3 and H4.
With regard to the Pneumatic belt tire of embodiment 3, in described embodiment 1 or 2, described rubber cushion is formed as follows, and roll the part of end closer to tire radial outside than described, the closer to this radial outside, thickness is more thinning.
With regard to the Pneumatic belt tire of embodiment 4, in any one of described embodiment 1-3, described bead filler adhesive tape comprises: downside bead apex (filler), and it surrounds described bead core; And upside bead apex, it is configured in the tire radial outside of described downside bead apex, and rubber hardness is lower than described downside bead apex, the rubber hardness of described rubber cushion is lower than the rubber hardness of described downside bead apex, and the rubber hardness of described rubber cushion is equal with described upside bead apex or higher than it.
With regard to the Pneumatic belt tire of embodiment 5, in described embodiment 4, the lower end of described rubber cushion is positioned at, than the tire axial external side end at the interface of described downside bead apex and described upside bead apex closer to the position of tire radial direction inner side.
With regard to the Pneumatic belt tire of embodiment 6, in described embodiment 4 or 5, liner (pad) is configured in outside the tire axial of described bead filler adhesive tape, described rubber cushion is clamped between described liner and described upside bead apex, and the rubber hardness of described liner is equal with the rubber hardness of described upside bead apex or higher than it.
With regard to the Pneumatic belt tire of embodiment 7, in any one of described embodiment 1-6, H1/H2 is 1.3-1.8.
The effect of invention
According to the present embodiment, tire quality can be suppressed to increase, and suppress the generation of core, and the durability of bead part can be improved.
Accompanying drawing explanation
Fig. 1 is the semisectional view of the Pneumatic belt tire that the first embodiment is shown.
Fig. 2 is the cutaway view of the bead part of the Pneumatic belt tire that the first embodiment is shown.
Fig. 3 is the cutaway view that the part being exaggerated described bead part is shown.
Fig. 4 is the cutaway view of the bead part of the Pneumatic belt tire that the second embodiment is shown.
Fig. 5 is the cutaway view of the bead part of the Pneumatic belt tire that the 3rd embodiment is shown.
Fig. 6 is the cutaway view of the bead part of the Pneumatic belt tire that comparative example is shown.
Description of reference numerals
10 Pneumatic belt tires
12,12A, 12B bead part
18 carcass pliess
18B rolls portion
18E rolls end
26 bead cores
28 bead filler adhesive tape
32 fabric reinforcements,
32A first fabric reinforcement
32AE upper end
32B second fabric reinforcement
32BE upper end
32C fabric reinforcement
34 metal shieldings
34E upper end
38 rubber cushions
38A upper end
38B lower end
Bead apex on the downside of in the of 40
Bead apex on the upside of in the of 42
44 interfaces
44A tire axial external side end
Detailed description of the invention
(the first embodiment)
Fig. 1 illustrates the Pneumatic belt tire 10 of the first embodiment, shows the half section under the state being installed on regulation wheel rim 1.
Refer to when being arranged on regulation wheel rim, be arranged on corresponding to tire size with the regulation wheel rim that specification is determined, and be filled with regular interior pressure, the non-loaded state determined with specification corresponding to identical tire size.At this, specification wheel rim refers to, " the Design Rim " in such as, " standard rim " in JATMA specification, TRA specification, " MeasuringRim " in ETRTO specification.In addition, regular interior pressure refers to, such as corresponding with single-wheel maximum load capability in JATMA specification " most anticyclonic pressure ", " maxim " in TRA specification described in " TIRE LOAD LIMITS ATVARIOUS COLD INFLATION PRESSURES ", " the INFLATION PRESSURE " in ETRTO specification.Not shown in figs. 2-6 have wheel rim, the setting of the size of the present embodiment be based on shape when being arranged on regulation wheel rim.
In this manual, tire axial refers to the direction being parallel to tire rotation axle, identical with tire width direction meaning, represents in the drawings with Reference numeral Y.In addition, tire radial direction (meridian direction) refers to the direction perpendicular to tire rotation axle, represents in the drawings with Reference numeral Z.
The tire 10 of embodiment possesses: pair of right and left bead part 12; Pair of sidewall portion 14, it extends from bead part 12 to tire radial outside; And fetus face 16, it is arranged between two sidewall 14 in the radial outside end mode each other of the sidewall 14 linking left and right.
The inside of tire 10 is embedded with carcass plies 18, and described carcass plies 18 extends across between pair of bead portion 12.Carcass plies 18 extends from fetus face 16 through sidewall 14, and its both ends are locked to bead part 12.The outer circumferential side of the carcass plies 18 of fetus face 16 is provided with bracing ply 20, and bracing ply 20 is for the periphery reinforcement fetus face 16 at carcass plies 18.Carcass plies 18 covers rubber coated plies cords (ply cord) with top and is formed, and this plies cords is arranging with on the substantially vertical crossing direction of tire circumferential direction.Steel cord, organic fiber cord are used as plies cords.
The inner side of carcass plies 18 is provided with inside liner 22, and described inside liner 22 is as the layer of resistance to breathable rubber of the inner peripheral surface of formation tire 10.In addition, with regard to sidewall 14, have sidewall rubber 24 in the arranged outside of carcass plies 18, described sidewall rubber 24 is for forming the outside wall surface of tire 10.
As shown in amplify in Fig. 2, be embedded with in bead part 12: the bead core 26 of ring-type, it is made up of bulk, and this bulk is formed with the stacked winding of the steel bead wire of rubber coated; The bead filler adhesive tape 28 of rubber, it is configured in the tire radial outside of this bead core 26.
Carcass plies 18 wraps up bead core 26 and rolls laterally inside tire axial.Specifically, with regard to carcass plies 18, the tire axial medial surface from the main part 18A of sidewall 14 extension along bead core 26 and bead filler adhesive tape 28 configures, and rolls laterally (that is, turning back) through the downside of bead core 26.Further, roll the tire axial lateral surface configuration of portion 18B along bead core 26 and bead filler adhesive tape 28, its top (that is, rolling the upper end of portion 18B) becomes and rolls end 18E.In addition, Reference numeral 30 represents for wrapping up the marginal belt (edge tape) that this rolls end 18E.
Be provided with around the carcass plies 18 of bead part 12: the fabric reinforcement 32 comprising organic fiber cord; And comprise the metal shielding 34 of metal cords.Specifically, the outside (that is, outside tire axial) of the portion that the rolls 18B of carcass plies 18 is provided with fabric reinforcement 32, in addition, is provided with metal shielding 34 rolling between portion 18B and fabric reinforcement 32.
In the present embodiment, metal shielding 34 is wire bead infantees steel cord being used as metal cords, it is by covering rubber coated steel cord to be formed with top, and this steel cord arranges with the inclined at inclination angles of such as 20 °-50 ° relative to tire circumferential direction.Metal shielding 34, to carry out the mode of reinforcement to the portion that the rolls 18B of carcass plies 18 from outside, is arranged along the lateral surface rolling portion 18B.In this example embodiment, metal shielding 34, in bead part 12, is overlapped in the outside face of carcass plies 18 in the mode of wrapping up carcass plies 18 and arranges.Namely, metal shielding 34 wraps up carcass plies 18 and rolls laterally inside tire axial, and adjacent with the main part 18A of carcass plies 18 and arrange along its medial surface inside the tire axial of bead core 26, and with to roll portion 18B adjacent and arrange along its lateral surface outside the tire axial of bead core 26.
In addition, metal shielding 34 be not limited to as shown in Figure 2, from inner side parcel carcass plies 18 and rolling laterally, also can roll from the position of the tire radial direction inner side of bead core 26.In fig. 2, Reference numeral 36 represents the marginal belt at the two ends being installed on metal shielding 34 respectively.
Fabric reinforcement 32 is the enhancement Layers such as nylon fiber cord being used as organic fiber cord, it is by covering rubber coated organic fiber cord to be formed with top, and this organic fiber cord arranges with the inclined at inclination angles of such as 20 °-50 ° relative to tire circumferential direction.Fabric reinforcement 32, outside the tire axial of bead core 26, overlaps the lateral surface in metal shielding 34.In this example embodiment, fabric reinforcement 32 is set to two-layer, the first fabric reinforcement 32A namely inside tire axial and the second fabric reinforcement 32B in outside.
First fabric reinforcement 32A, outside the tire axial of bead core 26, is arranged in the mode of upper end (that is, the tire radial outside end) 34E from outer side covers metal shielding 34.First fabric reinforcement 32A crosses the upper end 34E of metal shielding 34 and extends to tire radial outside.In this example embodiment, the first fabric reinforcement 32A is only configured in outside the tire axial of bead core 26, and the inner side not to bead core 26 is involved in.
Second fabric reinforcement 32B overlaps the lateral surface in the first fabric reinforcement 32A, and crosses the upper end 34E of metal shielding 34 and extend to tire radial outside.In this example embodiment, the second fabric reinforcement 32B crosses the lower end of the first fabric reinforcement 32A and is involved in inside tire axial, and is involved in part inside this, overlaps in metal shielding 34.
Have rubber cushion 38 in the tire axial arranged outside of bead filler adhesive tape 28, described rubber cushion 38 is for holding 18E from rolling of tire axial outer side covers carcass plies 18.Rubber cushion 38 is the rubber components arranged between bead filler adhesive tape 28 and fabric reinforcement 32, rubber cushion 38 is rolling end 18E closer to the position of tire radial direction inner side than carcass plies 18, arrange between rolling between portion 18B and fabric reinforcement 32, further, as shown in amplify in Fig. 3, to arrange between portion 18B and metal shielding 34 between rolling and to form terminal.
As shown in Figure 2, the section shape at the interface 29 of rubber cushion 38 and bead filler adhesive tape 28 is formed as the substantially linear of un-flexed, complications etc., that is, rubber cushion 38 configures along bead filler adhesive tape 28 smoothly.In addition, rubber cushion 38 is formed as follows, rolls end 18E closer to the part 38P of tire radial outside than carcass plies 18, and the closer to radial outside, thickness is more thinning.In this wise, end 18E is being rolled closer to the position in outside than carcass plies 18, formed in the mode that thickness is thinning gradually, can guarantee that rubber cushion 38 is rolling the thickness near end 18E thus, reduce the thickness of the upper end at the upper end of fabric reinforcement 32 or rubber cushion 38 simultaneously, thus the generation of core can be suppressed.
Outside the tire axial of bead core 26, the terminal location of above-mentioned each component is arranged as follows.The upper end 34E of metal shielding 34 is positioned at and rolls the position of end 18E closer to tire radial direction inner side than carcass plies 18.The upper end of fabric reinforcement 32 is positioned at than rolling the position of end 18E closer to tire radial outside.Specifically, the upper end 32AE of the first fabric reinforcement 32A and the upper end 32BE of the second fabric reinforcement 32B, is all positioned at than rolling the position of end 18E closer to tire radial outside.In addition, the upper end 32AE of the first fabric reinforcement 32A is positioned at upper end 32BE than the second fabric reinforcement 32B closer to the position of tire radial outside.The upper end 38A of rubber cushion 38 is positioned at upper end (being specially the upper end 32AE of the first fabric reinforcement 32A) than fabric reinforcement 32 closer to the position of tire radial outside.In addition, as mentioned above, because the lower end 38B of rubber cushion 38 is arranged between rolling between portion 18B and metal shielding 34, therefore, the lower end 38B of rubber cushion 38 is positioned at upper end 34E than metal shielding 34 closer to the position of tire radial direction inner side.
At this, as shown in Figure 2, using the tire radial distance (that is, the interval on the radial Z of tire) of the lower end 38B to the upper end 34E of metal shielding 34 from rubber cushion 38 as H0, using the upper end 34E from metal shielding 34 to rolling the tire radial distance of end 18E as H1.Now, H0 and H1 is set to roughly the same.Specifically, H1/H0 is set in (0.80≤H1/H0≤1.0) in the scope of 0.80-1.0.
In addition, hold the tire radial distance of 18E to the upper end 32BE of the second fabric reinforcement 32B as next stage portion as H2 using from rolling, using the tire radial distance of the upper end 32BE to the upper end 32AE of the first fabric reinforcement 32A as next stage portion from the second fabric reinforcement 32B as H3, using the tire radial distance of the upper end 32AE to the upper end 38A of the rubber cushion 38 as next stage portion from the first fabric reinforcement 32A as H4.Now, H2, H3 and H4 are set to roughly the same.Specifically, H2/H4 is set in (0.60≤H2/H4≤0.9) in the scope of 0.60-0.90, and H3/H4 is set in (0.80≤H3/H4≤1.0) in the scope of 0.80-1.0.Further preferably, H2/H4 and H3/H4 is set in the scope of 0.80-0.90.
Further, H0 and H1 is all set greater than any one in H2, H3 and H4.That is, H0 > H2, H0 > H3, H0 > H4, H1 > H2, H1 > H3 and H1 > H4.Preferably, 1.3≤H1/H2≤1.8.
In this wise, interval H0, the H1 of component ends in the both sides of the upper end 34E of setting metal shielding 34, it is made to be greater than interval H2, H3, H4 of the component ends of the both sides of upper end 32AE, 32BE of fabric reinforcement 32, and on this basis, interval H0 and H1 of each component ends is set to roughly the same, and H2, H3 and H4 is set to roughly the same, thus the increase of tire quality can be suppressed, and suppress the generation of core, the durability of bead part 12 can be improved simultaneously.Specifically, in order to suppress tire quality increase while suppress the generation of core, the partitioning method setting each component ends is equably highly effective.But compared with upper end 32AE, 32BE of fabric reinforcement 32, the upper end 34E of metal shielding 34 more easily concentrates strain, and thickness becomes more greatly and easily the major cause producing core.Therefore, by H0 and H1 being all set greater than any one in H2, H3 and H4, can on the limited height dimension of bead part 12 interval of suitably allocation member end, thus while the increase of tire quality can be suppressed, suppress the generation of core, and then can durability be improved.
The terminal location of the metal shielding 34 inside the tire axial of bead core 26 and the second fabric reinforcement 32B is not particularly limited, in the present embodiment, the terminal 32BF of the second fabric reinforcement 32B is positioned at terminal 34F than metal shielding 34 closer to the position of tire radial outside, and arranges in the mode covering this terminal 34F.
In the present embodiment, bead filler adhesive tape 28 comprises: downside bead apex 40, its circular cross section, and surrounds bead core 26; With upside bead apex 42, it is configured in the tire radial outside of downside bead apex 40, and rubber hardness is lower than the rubber hardness of downside bead apex 40.The interface 44 of downside bead apex 40 and upside bead apex 42 is formed as to the outstanding plane of bending of tire radial outside.It is the tapering shape in top that upside bead apex 42 has towards tire radial outside, and the top of upside bead apex 42 is configured in upper end 38A than rubber cushion 38 closer to the position of tire radial outside.
The rubber hardness (K1) of above-mentioned rubber cushion 38 is set as the rubber hardness (K3) lower than downside bead apex 40, and is equal to or greater than the rubber hardness (K2) of upside bead apex 42.That is, be set as K2≤K1 < K3, be more preferably K2 < K1 < K3.Accordingly, the adhesive bonding property with peripheral member can be guaranteed, suppress the movement of bead core 26 simultaneously.In addition, by arranging the higher rubber cushion of hardness 38, the movement rolling end 18E of carcass plies 18 can be suppressed.But be not particularly limited to, preferably, each hardness is as the criterion with the shore A (°) according to JIS K6253, the rubber hardness of downside bead apex 40 is 80-95 (being more preferably 85-90), the rubber hardness of upside bead apex 42 is 55-70 (being more preferably 56-65), and the rubber hardness of rubber cushion 38 is 65-80 (being more preferably 70-78).In addition, Reference numeral 45 represents the tyre bead outsourcing cloth (bead cover) being used for bead core 26.
In addition, in the present embodiment, as shown in Figure 2,3, the lower end 38B of rubber cushion 38 is positioned at, than the tire axial external side end 44A at the interface 44 of downside bead apex 40 and upside bead apex 42 closer to the position of tire radial direction inner side.Thus, rubber cushion 38 between the downside bead apex 40 in high rigidity outside, between carcass plies 18 and metal shielding 34 arrange.Therefore, it is possible to suppress the cord of carcass plies 18 to rupture between the downside bead apex 40 and metal shielding 34 of high rigidity, thus improve durability.
In addition, in the present embodiment, outside the tire axial of bead filler adhesive tape 28, liner 46 is configured with.Liner 46 clamps rubber cushion 38 together with upside bead apex 42.The viewpoint rolling the strain of end 18E from reducing effect in carcass plies 18, liner 46 preferably adopts has elastomeric material that is identical with upside bead apex 42 or its above hardness.
(the second embodiment)
Fig. 4 is the cutaway view of the bead part 12A of the Pneumatic belt tire that the second embodiment is shown.In this second embodiment, the structure of fabric reinforcement 32 is different from the first embodiment.
That is, in this example embodiment, be not only the second fabric reinforcement 32B, the first fabric reinforcement 32A is also involved in inside to it around bead core 26.In addition, outside the tire axial of bead core 26, the upper end 32BE of the second fabric reinforcement 32B is positioned at upper end 32AE than the first fabric reinforcement 32A closer to the position of tire radial outside, that is, the second fabric reinforcement 32B is arranged in the mode of the upper end 32AE from outer side covers first fabric reinforcement 32A.In addition, inside the tire axial of bead core 26, the terminal 32AF of the first fabric reinforcement 32A is positioned at than the position of the terminal 32BF of the second fabric reinforcement 32B and the terminal 34F of metal shielding 34 closer to tire radial outside, and arranges in the mode of the terminal 34F from inner side covering metal enhancement Layer 34.
In this wise, when forming fabric reinforcement 32 by 32A, 32B are two-layer, outside the tire axial of bead core 26, for the position relationship of each upper end 32AE, 32BE, whichever all can be positioned at radial outside, is not particularly limited.In addition, inside the tire axial about bead core 26, two-layerly all can be involved in the inside, for the position relationship of the terminal 32AF now inside this, 32BF, whichever all can be positioned at tire radial outside.About the second embodiment, other structure and action effect identical with the first embodiment, the description thereof will be omitted herein.
(the 3rd embodiment)
Fig. 5 is the cutaway view of the bead part 12B of the Pneumatic belt tire that the 3rd embodiment is shown.In 3rd embodiment, fabric reinforcement 32 is formed on this aspect different from the first embodiment with one deck.
Namely, in this example embodiment, possesses single fabric reinforcement 32C, outside the tire axial of bead core 26, the upper end 32CE of this fabric reinforcement 32C is positioned at and rolls the position of end 18E closer to tire radial outside than carcass plies 18, and the upper end 38A be positioned at than rubber cushion 38 is closer to the position of tire radial direction inner side.
And, identically with the first embodiment, H1/H0 is set in the scope of 0.80-1.0, on this basis, using from rolling the tire radial distance of upper end 32CE of end 18E to fabric reinforcement 32C as H2, using the tire radial distance of the upper end 32CE to the upper end 38A of the rubber cushion 38 as next stage portion from fabric reinforcement 32C as H4, and H2 and H4 is set to roughly the same.Specifically, H2/H4 is set in (0.60≤H2/H4≤0.90) in the scope of 0.60-0.90, is more preferably set in the scope of 0.80-0.90.In addition, H0 and H1 is all set greater than any one in H2 and H4, that is, is set as H0 > H2, H0 > H4, H1 > H2 and H1 > H4.Preferably, 1.3≤H1/H2≤1.8.
In this wise, when fabric reinforcement 32 is formed with one deck, as mentioned above, by setting the interval of each component ends, the increase of tire quality can be suppressed, and suppress the generation of core, thus improve the durability of bead part 12.About the 3rd embodiment, other structure and action effect identical with the first embodiment, the description thereof will be omitted herein.
(other embodiments)
Fabric reinforcement 32 also can be arranged with more than three layers.In this case, selected from carcass plies roll end to have tire radial outside the minimum upper end of radial distance, fabric reinforcement, and the upper end obtaining this fabric reinforcement and the tire radial distance rolled between end, and it can be used as H2.In addition, using the upper end of multiple fabric reinforcement tire radial distance each other as H3.Further, the selected upper end from rubber cushion to have tire radial direction inner side the minimum upper end of radial distance, fabric reinforcement, and obtain the tire radial distance between the upper end of this fabric reinforcement and the upper end of rubber cushion, and it can be used as H4.Further, about these H2, H3 and H4, and the first embodiment sets the interval of each component ends identically.
For the Pneumatic belt tire of the present embodiment, due to the excellent in te pins of durability of bead part, the suitable heavy Pneumatic tire for heavy vehicle used as the vehicle of the vehicle heavier mass such as lorry, city motor bus, industrial vehicle, engineering truck.
Above several embodiment is illustrated, but these embodiments only propose as an example, and be not intended to limit scope of the present invention.The embodiment of these novelties, implements by other various schemes, in the scope not departing from main points of the present invention, can carry out various omission, displacement and change.
[embodiment]
In order to illustrate structure and the effect of above-mentioned embodiment, manufacturing experimently heavy duty and having reused Pneumatic belt tire (appraisal procedure is as follows for size: 11R22.516PR, wheel rim: 22.5 × 7.50), and carried out Performance Evaluation.
(1) with or without core
After tyre vulcanization is shaping, detects the core that whether there is more than radius 5mm with air-foam detector, there is no representing by "○" of core, have representing by "×" of core.
(2) bead part durability
Fill in 900kPa in the tire being arranged on wheel rim and press, with 210% face contact of JATMA benchmark load-carrying at radius for 1.7m and on the steel drum of surface smoothing, and with the speeds of 40km/h 168 hours.Load load-carrying in every 168 hours increases by 10%, and travels until bead part is damaged.Room temperature is set as 40 DEG C.About until the time of damage, comparative example 1 is carried out exponential representation as 100.Numerical value is larger then represents that durability is better.
(3) tire quality
Measure the quality of tire, and relative to comparative example 1, quality increases representing by "○" within 3%, quality increases above 3% represent by "×".
By the representation of the tire of embodiment 1-5 and comparative example 1-4 in Table 1.Embodiment 1-3 is the example of the bead part structure shown in Fig. 2 with above-mentioned first embodiment, embodiment 4 is examples of the bead part structure shown in Fig. 5 with above-mentioned 3rd embodiment, and embodiment 5 is examples of the bead part structure shown in Fig. 4 with above-mentioned second embodiment.Comparative example 1 is the example not being provided with fabric reinforcement as shown in Figure 6, in figure 6, marks identical Reference numeral to the component suitable with the component illustrated in the first embodiment.Comparative example 2-4 is same with embodiment 1-3 based on the bead part structure shown in Fig. 2, but the setting at the interval of each component ends is different.In embodiment 1-5, the lower end 38B of rubber cushion 38 is all positioned at tire axial external side end 44A than bead apex interface 44 closer to the position of tire radial direction inner side.
In embodiment and comparative example, as forming the metal cords of metal shielding 34, employ the steel cord that twisted configuration is 3+8 × 0.22HT, this steel cord tilts 30 ° and arrange relative to tire circumferential direction.As forming the organic fiber cord of fabric reinforcement 32, employ the nylon fiber cord of 2991dtex, this nylon fiber cord tilts 40 ° and arrange relative to tire circumferential direction.
[table 1]
As shown in table 1, relative to the comparative example 1 tested as a comparison, the embodiment 1-5 of the present embodiment inhibits the increase of tire quality, and prevents the generation of core, improves the durability of bead part simultaneously.Especially, in the embodiment 1-3 and 5 suitably arranging two-layer fabric reinforcement, the durability of its bead part significantly improves.To this, in comparative example 2, although add fabric reinforcement, the distance rolled between end and the upper end of metal shielding of carcass plies is less, and in addition, the distance between fabric reinforcement is also less, therefore creates core, and the durability of bead part is also poor.In comparative example 3, because the interval of each component ends is wide, therefore the recruitment of tire quality is larger.In comparative example 4, the interval H1 due to the component ends near the upper end of metal shielding is equal to or less than the interval H2 of the component ends between fabric reinforcement, and therefore the durability of bead part is also poor.
Claims (7)
1. a Pneumatic belt tire, is characterized in that,
Described Pneumatic belt tire possesses:
Bead core, it is embedded in bead part; Bead filler adhesive tape, it is configured in the tire radial outside of described bead core; Carcass plies, it wraps up described bead core and rolls laterally inside tire axial; At least one deck fabric reinforcement, it comprises the organic fiber cord in the outside in the portion that rolls being arranged on described carcass plies; Metal shielding, its comprise be arranged on described in roll metal cords between portion and described fabric reinforcement; And rubber cushion, it rolls end from carcass plies described in tire axial outer side covers, and arranges between described bead filler adhesive tape and described fabric reinforcement,
Outside the tire axial of described bead core, the upper end of described metal shielding is positioned at rolls the position of end closer to tire radial direction inner side than described, the upper end of described fabric reinforcement is positioned at rolls the position of end closer to tire radial outside than described, the upper end of described rubber cushion is positioned at upper end than described fabric reinforcement closer to the position of tire radial outside, the lower end of described rubber cushion is arranged between described rolling between portion and described metal shielding
Using the tire radial distance of lower end to the upper end of described metal shielding from described rubber cushion as H0, using from the upper end of described metal shielding to the described tire radial distance rolling end as H1, using from described end of rolling to there is the tire radial distance of this upper end of fabric reinforcement of upper end nearest in tire radial direction as H2, using from the upper end of described rubber cushion to there is the tire radial distance of this upper end of fabric reinforcement of upper end nearest in tire radial direction as H4, H1/H0 is 0.80-1.0, H2/H4 is 0.60-0.90, and H0 and H1 is all greater than any one in H2 and H4.
2. Pneumatic belt tire according to claim 1, is characterized in that,
Described Pneumatic belt tire possesses at least two-layer described fabric reinforcement, using the upper end of described at least two-layer fabric reinforcement tire radial distance each other as H3, H1/H0 is 0.80-1.0, H2/H4 is 0.60-0.90, H3/H4 is 0.80-1.0, and H0 and H1 is all greater than any one in H2, H3 and H4.
3. Pneumatic belt tire according to claim 1, is characterized in that,
Described rubber cushion is formed as follows, and roll the part of end closer to tire radial outside than described, the closer to this radial outside, thickness is more thinning.
4. Pneumatic belt tire according to claim 1, is characterized in that,
Described bead filler adhesive tape comprises: downside bead apex, and it is for surrounding described bead core; And upside bead apex, it is configured in the tire radial outside of described downside bead apex, and rubber hardness is lower than the rubber hardness of described downside bead apex,
The rubber hardness of described rubber cushion is lower than the rubber hardness of described downside bead apex, and the rubber hardness of described rubber cushion is equal with described upside bead apex or higher than it.
5. Pneumatic belt tire according to claim 4, is characterized in that,
The lower end of described rubber cushion is positioned at, than the tire axial external side end at the interface of described downside bead apex and described upside bead apex closer to the position of tire radial direction inner side.
6. Pneumatic belt tire according to claim 4, is characterized in that,
Liner is configured in outside the tire axial of described bead filler adhesive tape, and described rubber cushion is clamped between described liner and described upside bead apex, and the rubber hardness of described liner is equal with the rubber hardness of described upside bead apex or higher than it.
7. Pneumatic belt tire according to claim 1, is characterized in that,
H1/H2 is 1.3-1.8.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-262726 | 2013-12-19 | ||
| JP2013262726A JP6153858B2 (en) | 2013-12-19 | 2013-12-19 | Pneumatic radial tire |
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| Publication Number | Publication Date |
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| CN104723804A true CN104723804A (en) | 2015-06-24 |
| CN104723804B CN104723804B (en) | 2017-04-12 |
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| CN201410795403.XA Active CN104723804B (en) | 2013-12-19 | 2014-12-18 | Pneumatic radial tire |
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| CN (1) | CN104723804B (en) |
Cited By (9)
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| CN106553491A (en) * | 2015-09-28 | 2017-04-05 | 东洋橡胶工业株式会社 | Pneumatic tire |
| CN106626988A (en) * | 2017-01-03 | 2017-05-10 | 万力轮胎股份有限公司 | Tire |
| CN108136842A (en) * | 2015-09-30 | 2018-06-08 | 横滨橡胶株式会社 | Pneumatic tire and its manufacturing method |
| CN108367635A (en) * | 2015-12-25 | 2018-08-03 | 横滨橡胶株式会社 | Pneumatic tire |
| CN109484098A (en) * | 2017-09-12 | 2019-03-19 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112533776A (en) * | 2018-11-02 | 2021-03-19 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112585018A (en) * | 2018-11-02 | 2021-03-30 | 横滨橡胶株式会社 | Pneumatic tire |
| TWI819665B (en) * | 2022-06-20 | 2023-10-21 | 正新橡膠工業股份有限公司 | Pneumatic tire |
| US11999200B2 (en) | 2018-11-02 | 2024-06-04 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105365498A (en) * | 2015-12-22 | 2016-03-02 | 广州丰力橡胶轮胎有限公司 | Tire |
| JP6790846B2 (en) * | 2017-01-13 | 2020-11-25 | 住友ゴム工業株式会社 | Pneumatic tires for heavy loads |
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| CN106553491A (en) * | 2015-09-28 | 2017-04-05 | 东洋橡胶工业株式会社 | Pneumatic tire |
| US10406867B2 (en) | 2015-09-28 | 2019-09-10 | Toyo Tire Corporation | Pneumatic tire |
| CN106553491B (en) * | 2015-09-28 | 2018-05-15 | 东洋橡胶工业株式会社 | Pneumatic tire |
| CN108136842A (en) * | 2015-09-30 | 2018-06-08 | 横滨橡胶株式会社 | Pneumatic tire and its manufacturing method |
| CN108136842B (en) * | 2015-09-30 | 2020-03-03 | 横滨橡胶株式会社 | Pneumatic tire and method for manufacturing same |
| CN108367635A (en) * | 2015-12-25 | 2018-08-03 | 横滨橡胶株式会社 | Pneumatic tire |
| CN108367635B (en) * | 2015-12-25 | 2020-06-19 | 横滨橡胶株式会社 | Pneumatic tire |
| US11260704B2 (en) | 2015-12-25 | 2022-03-01 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
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| CN109484098A (en) * | 2017-09-12 | 2019-03-19 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112533776A (en) * | 2018-11-02 | 2021-03-19 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112585018A (en) * | 2018-11-02 | 2021-03-30 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112533776B (en) * | 2018-11-02 | 2022-10-14 | 横滨橡胶株式会社 | Pneumatic tire |
| US11999200B2 (en) | 2018-11-02 | 2024-06-04 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
| TWI819665B (en) * | 2022-06-20 | 2023-10-21 | 正新橡膠工業股份有限公司 | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6153858B2 (en) | 2017-06-28 |
| JP2015116973A (en) | 2015-06-25 |
| CN104723804B (en) | 2017-04-12 |
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