CN104723804B - Pneumatic radial tire - Google Patents

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

Pneumatic belt tire

Technical field

The present invention relates to a kind of Pneumatic belt tire.

Background technology

For Pneumatic belt tire, especially for counterweight load-carrying Pneumatic belt tire, need to improve bead part Durability.In order to improve the durability of bead part, by the strain for suppressing the deformation of bead part to reduce the turnup end of casing ply Method it is largely effective.Therefore, generally along the turnup of casing ply, the enhancement layer for being referred to as chafer is set (with reference to patent Document 1).

Following content is Patent Document 2 discloses, as this enhancement layer, the all-steel cord comprising all-steel cord is set and is added Strong layer and the fiber cord enhancement layer comprising organic fiber, and the upper end of all-steel cord enhancement layer is made less than the volume of casing ply Origin or beginning, and the upper end of fiber cord enhancement layer is made higher than the turnup end, on this basis, in the inner side of fiber cord enhancement layer Elastomeric compound is set.Following content is also disclosed that in patent documentation 3, as the enhancement layer of bead part, is arranged comprising all-steel cord Cord reinforcing layer and the additional cord layer comprising fiber cord.

Prior art literature：

Patent documentation

Patent documentation 1:Japanese Laid-Open 2013-1223 publication

Patent documentation 2:The clear 63-110006 publications of Japanese Laid-Open

Patent documentation 3:The flat 8-324214 publications of Japanese Laid-Open

The content of the invention

The invention problem to be solved

As described above, by arranging metal shielding, He Bao comprising all-steel cord around the turnup of casing ply Fabric reinforcement containing organic fiber cord is realizing reinforcement such that it is able to make the strain dispersion of the turnup end of casing ply, thus The durability of bead part can be improved.But, so arranging multiple enhancement layers can then make the interval between each component ends diminish. Therefore, air is easily involved in Tire production operation, and core is easily produced in the tire of sulfidization molding.On the other hand, Although the generation of core can be suppressed by increasing the interval between each component ends, between each component ends between Increase every the big thickness for being then easily caused bead part is become, and become the main cause that tire becomes weight.

The present invention is to propose in view of the above circumstances, be its object is to, there is provided one kind can suppress tire quality to increase, And suppress the generation of core, and the Pneumatic belt tire of the durability of bead part can be improved.

The method for solving problem

The Pneumatic belt tire of embodiment 1 possesses：Bead core, it is embedded in bead part；Bead filler adhesive tape (bead Filler), it is configured in the tire radial outside of the bead core；Casing ply, it is from the tire axial inner side parcel tyre bead Core and roll laterally；At least one of which fabric reinforcement, it includes the organic of the outside of the turnup for being arranged on the casing ply Fiber cord；Metal shielding, it includes the metal cords being arranged between the turnup and the fabric reinforcement；And glue Pad (rubber pad), it is used for the turnup end from casing ply described in tire axial outer side covers, and fills out between the tyre bead Fill between adhesive tape and the fabric reinforcement and arrange.On the outside of the tire axial of the bead core, the metal shielding it is upper End is located at the position than the turnup end closer to tire radial direction inner side, and the upper end of the fabric reinforcement is located to be rolled than described Hold the position closer to tire radial outside, the upper end of the rubber cushion is located at the upper end than the fabric reinforcement closer to tire The position of radial outside, the lower end of the rubber cushion is arranged between the turnup and the metal shielding.Also, will be from The tire radial distance of the lower end of the rubber cushion to the upper end of the metal shielding as H0, by from the metal shielding The tire radial distance of upper end to the turnup end as H1, by from the turnup end to radially nearest upper in tire The tire radial distance of the upper end of the fabric reinforcement at end as H2, by from the upper end of the rubber cushion to in tire radially Used as H4, H1/H0 is 0.80-1.0 to the tire radial distance of the upper end of the fabric reinforcement of upper nearest upper end, and H2/H4 is 0.60-0.90, and H0 and H1 are all higher than any one in H2 and H4.

For the Pneumatic belt tire of embodiment 2, in described embodiment 1, possess described at least two-layer Fabric reinforcement, using the mutual tire radial distance in upper end of at least two-layer fabric reinforcement as H3, H1/H0 is 0.80-1.0, H2/H4 are 0.60-0.90, and H3/H4 is 0.80-1.0, and H0 and H1 be all higher than it is any one in H2, H3 and H4 It is individual.

For the Pneumatic belt tire of embodiment 3, in described embodiment 1 or 2, the rubber cushion is with as follows Mode is formed, than the turnup end closer to tire radial outside part, the closer to the radial outside, thickness more gradually becomes It is thin.

It is described in any one of described embodiment 1-3 for the Pneumatic belt tire of embodiment 4 Bead filler adhesive tape includes：Downside gum filler (filler), it surrounds the bead core；And upside gum filler, its configuration In the tire radial outside of the downside gum filler, and rubber hardness is less than the downside gum filler, the rubber cushion Rubber hardness is less than the rubber hardness of the downside gum filler, and glue is filled in the rubber hardness of the rubber cushion and the upside Bar is equal or higher than it.

For the Pneumatic belt tire of embodiment 5, in described embodiment 4, the lower end position of the rubber cushion In more inside closer to tire footpath than the tire axial outboard end of the downside gum filler and the interface of the upside gum filler The position of side.

For the Pneumatic belt tire of embodiment 6, in described embodiment 4 or 5, liner (pad) configuration On the outside of the tire axial of the bead filler adhesive tape, the rubber cushion be clamped in the liner and the upside gum filler it Between, the rubber hardness of the liner is equal with the rubber hardness of the upside gum filler or higher than it.

For the Pneumatic belt tire of embodiment 7, in any one of described embodiment 1-6, H1/H2 For 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 bead part can be improved Durability.

Description of the drawings

Fig. 1 is the half sectional view of the Pneumatic belt tire for illustrating the first embodiment.

Fig. 2 is the sectional view of the bead part of the Pneumatic belt tire for illustrating the first embodiment.

Fig. 3 is the sectional view for illustrating the part for being exaggerated the bead part.

Fig. 4 is the sectional view of the bead part of the Pneumatic belt tire for illustrating the second embodiment.

Fig. 5 is the sectional view of the bead part of the Pneumatic belt tire for illustrating the 3rd embodiment.

Fig. 6 is the sectional view of the bead part of the Pneumatic belt tire for illustrating comparative example.

Description of reference numerals

10 Pneumatic belt tires

12nd, 12A, 12B bead part

18 casing plies

18B turnups

18E turnup ends

26 bead cores

28 bead filler adhesive tape

32 fabric reinforcements,

The fabric reinforcements of 32A first

32AE upper ends

The fabric reinforcements of 32B second

32BE upper ends

32C fabric reinforcements

34 metal shieldings

34E upper ends

38 rubber cushions

38A upper ends

38B lower ends

40 downside gum fillers

42 upside gum fillers

44 interfaces

44A tire axial outboard ends

Specific embodiment

(the first embodiment)

Fig. 1 illustrates the Pneumatic belt tire 10 of the first embodiment, shows and is installed in the state of regulation wheel rim 1 Half section.

Installed in regulation wheel rim when refer to, installed in corresponding to tire size with specification determine regulation wheel rim, and It is filled with regular intrinsic pressure, the non-loaded state determined with specification corresponding to identical tire size.Here, specification wheel rim is Refer to, such as in " Design Rim ", the ETRTO specifications in " standard rim ", TRA specifications in JATMA specifications “Measuring Rim”.In addition, it is regular it is intrinsic pressure refer to, such as it is corresponding with single-wheel maximum load capability in JATMA specifications " highest air pressure ", in TRA specifications " TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES " " INFLATION PRESSURE " in described " maximum ", ETRTO specifications.It is not shown in figs. 2-6 to have wheel rim, this reality Apply scheme size setting be based on installed in regulation wheel rim when shape.

In this manual, tire axial refers to the direction parallel to tire rotary shaft, with tire width direction meaning phase Together, represented with reference Y in figure.In addition, tire radial direction (meridian direction) is referred to perpendicular to the direction of tire rotary shaft, Represented with reference Z in figure.

The tire 10 of embodiment possesses：Pair of right and left bead part 12；A pair of sidewall portion 14, it is from bead part 12 to tire Radial outside extends；And fetus face 16, it is arranged in the mutual mode in radial outside end for linking the sidewall 14 of left and right Between two sidewalls 14.

The inside of tire 10 is embedded with casing ply 18, and the casing ply 18 extends between a pair of bead portion 12.Curtain Layer of cloth 18 extends from fetus face 16 through sidewall 14, and its both ends is locked to bead part 12.In the curtain of fetus face 16 The outer circumferential side of layer of cloth 18 is provided with belt 20, and belt 20 is used for the periphery reinforcement fetus face 16 in casing ply 18.Casing ply 18 is to cover rubber coated plies cords (ply cord) with top and formed, and the plies cords are big with tire circumferential direction Arrange on the direction that cause intersects vertically.All-steel cord, organic fiber cord are used as into plies cords.

The inner side of casing ply 18 is provided with inner liner 22, the inner liner 22 is resistance to as the inner peripheral surface for constituting tire 10 Breathable rubber layer.In addition, for sidewall 14, in the outside of casing ply 18 sidewall rubber 24, the sidewall rubber are provided with 24 are used to constitute the outside wall surface of tire 10.

As shown in amplifying in Fig. 2, it is embedded with bead part 12：The bead core 26 of ring-type, it is made up of bulk, the boundling Body is will to be laminated winding with the steel bead wire of rubber coated and formed；The bead filler adhesive tape 28 of rubber system, it is configured in this The tire radial outside of bead core 26.

Casing ply 18 is rolled laterally from tire axial inner side parcel bead core 26.Specifically, with regard to casing ply 18 Speech, the main part 18A extended from sidewall 14 is configured along the tire axial medial surface of bead core 26 and bead filler adhesive tape 28, And the lower laterally outside through bead core 26 is rolled (that is, turn back).Also, turnup 18B is along bead core 26 and bead filler The tire axial lateral surface configuration of adhesive tape 28, its top (that is, the upper end of turnup 18B) becomes turnup end 18E.Additionally, accompanying drawing Labelling 30 represents the boundary zone (edge tape) for wrapping up turnup end 18E.

It is provided with around the casing ply 18 of bead part 12：Fabric reinforcement 32 comprising organic fiber cord；And bag Metal shielding 34 containing metal cords.Specifically, casing ply 18 turnup 18B outside (that is, outside tire axial Side) fabric reinforcement 32 is provided with, in addition, being provided with metal shielding 34 between turnup 18B and fabric reinforcement 32.

In the present embodiment, metal shielding 34 is the wire bead infantees that all-steel cord is used as metal cords, its By covering rubber coated all-steel cord being formed with top, the all-steel cord relative to tire circumferential direction with such as 20 °- 50 ° of inclined at inclination angles arrangement.Metal shielding 34 to the turnup 18B of casing ply 18 carrying out the side of reinforcement from outside Formula, the lateral surface along turnup 18B is arranged.In this example embodiment, metal shielding 34 is in bead part 12, to wrap up casing ply 18 Mode be overlapped in the outer surface of casing ply 18 and arrange.That is, metal shielding 34 is from tire axial inner side parcel casing ply 18 And roll laterally, and it is adjacent with the main part 18A of casing ply 18 on the inside of the tire axial of bead core 26 and along on the inside of it Face is arranged, and adjacent with turnup 18B on the outside of the tire axial of bead core 26 and arrange along its lateral surface.

Additionally, metal shielding 34 be not limited to it is as shown in Figure 2, from inner side wrap up casing ply 18 and roll up laterally Rise, it is also possible to roll from the position of the tire radial direction inner side of bead core 26.In fig. 2, reference 36 is represented and is respectively arranged in The boundary zone at the two ends of metal shielding 34.

Fabric reinforcement 32 is for example nylon fiber cord to be used as into the enhancement layer of organic fiber cord, and it is by with top Cover rubber coated organic fiber cord to be formed, the organic fiber cord is relative to tire circumferential direction with such as 20 ° -50 ° Inclined at inclination angles arrangement.Fabric reinforcement 32 is overlapped in metal shielding on the outside of the tire axial of bead core 26 34 lateral surface.In this example embodiment, fabric reinforcement 32 is set to the first fabric reinforcement on the inside of two-layer, i.e. tire axial The 32A and second fabric reinforcement 32B in outside.

First fabric reinforcement 32A on the outside of the tire axial of bead core 26, with from outer side covers metal shielding 34 The mode of upper end (that is, tire radial outside end) 34E is arranged.First fabric reinforcement 32A crosses the upper end of metal shielding 34 34E and to tire radial outside extend.In this example embodiment, the first fabric reinforcement 32A is only configured in the tire axle of bead core 26 Laterally, the inner side not to bead core 26 is involved in.

Second fabric reinforcement 32B is overlapped in the lateral surface of the first fabric reinforcement 32A, and crosses metal shielding 34 upper end 34E and to tire radial outside extend.In this example embodiment, the second fabric reinforcement 32B crosses the reinforcement of the first fiber The lower end of layer 32A is simultaneously involved in, and be involved in part on the inside of this to tire axial inner side, overlaps in metal shielding 34。

Rubber cushion 38 is provided with the outside of the tire axial of bead filler adhesive tape 28, the rubber cushion 38 is used for from outside tire axial Side covers the turnup end 18E of casing ply 18.Rubber cushion 38 is arranged between bead filler adhesive tape 28 and fabric reinforcement 32 Rubber component, rubber cushion 38 the turnup end 18E than casing ply 18 closer to tire radial direction inner side position, between turnup 18B Arrange and fabric reinforcement 32 between, further, such as in Fig. 3 shown in amplification, between turnup 18B and metal shielding 34 it Between arrange and formed terminal.

As shown in Fig. 2 the section shape at the interface 29 of rubber cushion 38 and bead filler adhesive tape 28 is formed as un-flexed, complications etc. Substantially linear, i.e. rubber cushion 38 is configured smoothly along bead filler adhesive tape 28.In addition, the shape as follows of rubber cushion 38 Into, than casing ply 18 turnup end 18E closer to tire radial outside part 38P, the closer to radial outside thickness more by Gradual change is thin.In this wise, the turnup end 18E than casing ply 18 closer to outside position, with the gradually thinning mode shape of thickness Into thus, it is possible to guarantee thickness of the rubber cushion 38 near turnup end 18E, while reducing in the upper end of fabric reinforcement 32 or rubber cushion The thickness of 38 upper end such that it is able to suppress the generation of core.

On the outside of the tire axial of bead core 26, the terminal location of above-mentioned each component is arranged as follows.Metal is strengthened Layer 34 upper end 34E be located at than casing ply 18 turnup end 18E closer to tire radial direction inner side position.Fabric reinforcement 32 Upper end is located at the position than turnup end 18E closer to tire radial outside.Specifically, the upper end of the first fabric reinforcement 32A The upper end 32BE of 32AE and the second fabric reinforcement 32B, is respectively positioned on the position closer to tire radial outside than turnup end 18E. In addition, the upper end 32AE of the first fabric reinforcement 32A is located at the upper end 32BE than the second fabric reinforcement 32B closer to tire footpath Position laterally.The upper end 38A of rubber cushion 38 is located at upper end (specially the first fabric reinforcement 32A than fabric reinforcement 32 Upper end 32AE) closer to the position of tire radial outside.In addition, as noted previously, as the lower end 38B of rubber cushion 38 is between rolling Arrange between portion 18B and metal shielding 34, therefore, the lower end 38B of rubber cushion 38 be located at than metal shielding 34 upper end 34E more Near the position of tire radial direction inner side.

Here, as shown in Fig. 2 by from the tire of the upper end 34E of the lower end 38B of rubber cushion 38 to metal shielding 34 radially away from From (that is, the interval in tire radial direction Z) as H0, by the tire radial direction from the upper end 34E of metal shielding 34 to turnup end 18E Distance is used as H1.Now, H0 and H1 is set to into roughly the same.Specifically, H1/H0 is set in the range of 0.80-1.0 (0.80≦H1/H0≦1.0)。

In addition, using from turnup end 18E to the second fabric reinforcement 32B as next stage portion upper end 32BE wheel Tire radial distance as H2, using from the upper end 32BE of the second fabric reinforcement 32B to the first fiber as next stage portion The tire radial distance of the upper end 32AE of enhancement layer 32A as H3, using from the upper end 32AE of the first fabric reinforcement 32A to as The tire radial distance of the upper end 38A of the rubber cushion 38 of next stage portion is used as H4.Now, H2, H3 and H4 are set to substantially It is identical.Specifically, H2/H4 is set in in the range of 0.60-0.90 (0.60≤H2/H4≤0.9), and H3/H4 is set It is scheduled in the range of 0.80-1.0 (0.80≤H3/H4≤1.0).It is further preferred that H2/H4 and H3/H4 are set in into 0.80- In the range of 0.90.

Further, H0 and H1 are set greater than into 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, H1 of the component ends in the both sides of the upper end 34E for setting metal shielding 34 so as to big In 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, will The interval H0 and H1 of each component ends is set to roughly the same, and H2, H3 and H4 are set to into roughly the same such that it is able to press down The increase of tire quality processed, and suppress the generation of core, while the durability of bead part 12 can be improved.Specifically, in order to Suppress the generation for suppressing core while the increase of tire quality, the partitioning method for equably setting each component ends is that extremely have Effect.But, compared with upper end 32AE, 32BE of fabric reinforcement 32, the upper end 34E of metal shielding 34 is easily concentrated should Become, and thickness it is larger and easily become produce core main cause.Therefore, by by H0 and H1 be set greater than H2, Any one in H3 and H4, can on the limited height dimension of bead part 12 the suitably interval of allocation member end, So as to suppress the generation of core while the increase for suppressing tire quality, and then durability can be improved.

To the terminal location of the fabric reinforcement 32B of metal shielding 34 and second on the inside of the tire axial of bead core 26 simultaneously It is not particularly limited, in the present embodiment, terminal 32BF of the second fabric reinforcement 32B is located at the end than metal shielding 34 End 34F closer to tire radial outside position, and to cover terminal 34F in the way of arrange.

In the present embodiment, bead filler adhesive tape 28 includes：Downside gum filler 40, its circular cross section, and wrap Enclose bead core 26；With upside gum filler 42, it is configured in the tire radial outside of downside gum filler 40, and rubber hardness Less than the rubber hardness of downside gum filler 40.The interface 44 of downside gum filler 40 and upside gum filler 42 is formed as to wheel The flexure plane that tire radial outside is projected.Upside gum filler 42 has towards tire radial outside in the tapering shape in top, on The top of side gum filler 42 is configured in the 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 at less than the rubber hardness (K3) of downside gum filler 40, and waits In or more than the rubber hardness (K2) of upside gum filler 42.That is, it is set as K2≤K1 ＜ K3, more preferably K2 ＜ K1 ＜ K3. Hereby it is possible to guarantee the cohesive with peripheral member, while suppressing the movement of bead core 26.In addition, higher by arranging hardness Rubber cushion 38, the movement of the turnup end 18E of casing ply 18 can be suppressed.But not it is particularly limited to, it is preferable that each hardness is with root It is defined according to shore A (°) of JIS K6253, the rubber hardness of downside gum filler 40 is 80-95 (more preferably 85-90), upside The rubber hardness of gum filler 42 is 55-70 (more preferably 56-65), the rubber hardness of rubber cushion 38 be 65-80 (more preferably 70-78).Additionally, reference 45 represents the tyre bead outsourcing cloth (bead cover) 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 located at, than downside gum filler 40 With the tire axial outboard end 44A at the interface 44 of upside gum filler 42 closer to tire radial direction inner side position.Thus, rubber cushion 38 between positioned at high rigidity downside gum filler 40 it is outside, between casing ply 18 and metal shielding 34 arrange.Therefore, The cord that casing ply 18 can be suppressed ruptures between the downside gum filler 40 and metal shielding 34 of high rigidity, so as to Improve durability.

Additionally, in the present embodiment, liner 46 is configured with the outside of the tire axial of bead filler adhesive tape 28.Liner 46 with Upside gum filler 42 clamps together rubber cushion 38.From from the viewpoint of the strain of turnup end 18E for reducing acting on casing ply 18, Liner 46 is preferably using the elastomeric material with hardness identical with upside gum filler 42 or more than it.

(the second embodiment)

Fig. 4 is the sectional view of bead part 12A of the Pneumatic belt tire for illustrating the second embodiment.In the second embodiment party In case, the structure of fabric reinforcement 32 is different from the first embodiment.

I.e., in this example embodiment, the second fabric reinforcement 32B is not only, the first fabric reinforcement 32A is also in bead core 26 Surrounding is involved in its inner side.In addition, on the outside of the tire axial of bead core 26, the upper end 32BE positions of the second fabric reinforcement 32B In the upper end 32AE than the first fabric reinforcement 32A closer to tire radial outside position, i.e. the second fabric reinforcement 32B Arranged in the way of the upper end 32AE from outer side covers the first fabric reinforcement 32A.In addition, in the tire axial of bead core 26 Side, terminal 32AF of the first fabric reinforcement 32A is located at terminal 32BF and metal shielding 34 than the second fabric reinforcement 32B Terminal 34F closer to tire radial outside position, and by from inner side cover metal shielding 34 terminal 34F in the way of set Put.

In this wise, in the case where fabric reinforcement 32 is constituted by 32A, 32B two-layer, outside the tire axial of bead core 26 Side, for the position relationship of each upper end 32AE, 32BE, whichever can be located at radial outside, especially not limit It is fixed.In addition, with regard to the tire axial inner side of bead core 26, two-layer can be involved in inner side, for terminal now on the inside of this For the position relationship of 32AF, 32BF, whichever can be located at tire radial outside.It is other with regard to the second embodiment Structure and action effect are identical with the first embodiment, and herein the description thereof will be omitted.

(the 3rd embodiment)

Fig. 5 is the sectional view of bead part 12B of the Pneumatic belt tire for illustrating the 3rd embodiment.3rd embodiment In, fabric reinforcement 32 is constituted with one layer different from the first embodiment on this aspect.

I.e., in this example embodiment, possess single fabric reinforcement 32C, on the outside of the tire axial of bead core 26, the fiber The upper end 32CE of enhancement layer 32C is located at the turnup end 18E than casing ply 18 closer to the position of tire radial outside, and is located at Than rubber cushion 38 upper end 38A closer to tire radial direction inner side position.

Also, identically with the first embodiment, H1/H0 is set in the range of 0.80-1.0, on this basis, will be from The tire radial distance of the upper end 32CE of turnup end 18E to fabric reinforcement 32C as H2, by from the upper of fabric reinforcement 32C The tire radial distance of end 32CE to the upper end 38A of the rubber cushion 38 as next stage portion sets H2 and H4 as H4 Into roughly the same.Specifically, H2/H4 is set in in the range of 0.60-0.90 (0.60≤H2/H4≤0.90), more preferably It is set in the range of 0.80-0.90.In addition, H0 and H1 are set greater than into any one in H2 and H4, i.e. be set as H0 ＞ H2, H0 ＞ H4, H1 ＞ H2 and H1 ＞ H4.Preferably, 1.3≤H1/H2≤1.8.

In this wise, in the case where fabric reinforcement 32 is constituted with one layer, as described above, by each component ends of setting Interval, the increase of tire quality can be suppressed, and suppress the generation of core, so as to improve the durability of bead part 12.With regard to 3rd embodiment, other structures and action effect it is identical with the first embodiment, herein the description thereof will be omitted.

(other embodiments)

Fabric reinforcement 32 can also be with three layers of arrangement above.In this case, select from the turnup end of casing ply to There is radial distance minimum upper end, fabric reinforcement in tire radial outside, and obtain the fabric reinforcement upper end and Tire radial distance between turnup end, and as H2.In addition, by the mutual tire footpath in the upper end of multiple fabric reinforcements To distance as H3.Further, select upper to have radial distance minimum in tire radial direction inner side from the upper end of rubber cushion End, fabric reinforcement, and obtain the tire radial distance between the upper end of the fabric reinforcement and the upper end of rubber cushion, and by its As H4.Also, with regard to these H2, H3 and H4, the interval of each component ends is set identically with the first embodiment.

For the Pneumatic belt tire of the present embodiment, due to the excellent in te pins of durability of bead part, suitably as goods The heavy Pneumatic tire for heavy vehicle that the heavier vehicle of the vehicle mass such as car, bus, industrial vehicle, engineering truck is used.

Several embodiments are illustrated above, but these embodiments are only to propose as an example, not It is intended to limit the scope of the present invention.These novel embodiments, can be implemented by other various schemes, not taken off In the range of main points of the present invention, various omissions, displacement and change can be carried out.

【Embodiment】

In order to illustrate the structure and effect of the embodiment above, heavily loaded reuse Pneumatic belt tire (chi has been manufactured experimently It is very little：11R22.516PR, wheel rim：22.5 × 7.50), and Performance Evaluation has been carried out, appraisal procedure is as follows.

(1) core is whether there is

After tyre vulcanization molding, the core for detecting whether to there is more than radius 5mm with bubble detector, without core Represent there be being represented with "×" for core with "○".

(2) bead part durability

To the intrinsic pressure of 900kPa is filled in the tire of wheel rim, existed with 210% face contact of JATMA benchmark load-carryings On the steel drum that radius is smoothed for 1.7m and surface, and 168 hours are travelled with the speed of 40km/h.Load-carrying was loaded per 168 hours Increase by 10%, and travelled till bead part is damaged.Room temperature is set as 40 DEG C.With regard to the time till damage, will Comparative example 1 carries out exponential representation as 100.Numerical value is more big then to represent that durability is better.

(3) tire quality

The quality of measurement tire, and relative to comparative example 1, quality increases being represented with "○" within 3%, quality increases super Cross 3% to be represented with "×".

By in the structure Biao Shi table 1 of embodiment 1-5 and the tire of comparative example 1-4.Embodiment 1-3 is with above-mentioned first The example of the bead part structure shown in Fig. 2 of embodiment, embodiment 4 is shown in the Fig. 5 with above-mentioned 3rd embodiment The example of bead part structure, embodiment 5 is the example of the bead part structure shown in the Fig. 4 with above-mentioned second embodiment.Than The example for being not provided with fabric reinforcement as shown in Figure 6 compared with example 1, in figure 6, pair with said in the first embodiment The suitable component mark identical reference of bright component.Comparative example 2-4 is with embodiment 1-3 equally with the tyre bead shown in Fig. 2 Based on portion's structure, 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 equal Positioned at the tire axial outboard end 44A than gum filler interface 44 closer to tire radial direction inner side position.

In embodiment and comparative example, as the metal cords of composition metal enhancement layer 34, twisted configuration has been used to be 3+8 The all-steel cord of × 0.22HT, the all-steel cord inclines 30 ° and arranges relative to tire circumferential direction.Strengthen as fiber is constituted The organic fiber cord of layer 32, has used the nylon fiber cord of 2991dtex, and the nylon fiber cord is relative to tire circumference Direction inclines 40 ° and arranges.

【Table 1】

As shown in table 1, relative to the comparative example 1 tested as a comparison, embodiment 1-5 of the present embodiment inhibits tire The increase of quality, and the generation of core is prevented, while improve the durability of bead part.Especially, suitably arranging In embodiment 1-3 of two-layer fabric reinforcement and 5, the durability of its bead part is significantly improved.In this regard, in comparative example 2, although Fabric reinforcement is increased, but the distance between upper end of the turnup end of casing ply and metal shielding is less, in addition, fiber The distance between enhancement layer is also less, therefore generates core, and the durability of bead part is also poor.In comparative example 3, due to each The interval of component ends is wide, therefore the incrementss of tire quality are larger.In comparative example 4, due to the upper end of metal shielding The interval H1 of neighbouring component ends is equal to or less than the interval H2 of the component ends between fabric reinforcement, therefore bead part Durability is also poor.

Claims (7)

1. a kind of Pneumatic belt tire, it is characterised in that

The 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 the bead core；Cord Layer, it is rolled laterally from the tire axial inner side parcel bead core；At least one of which fabric reinforcement, it includes and is arranged on The axially external organic fiber cord of the turnup of the casing ply；Metal shielding, it includes and is arranged on the turnup And the metal cords between the fabric reinforcement；And rubber cushion, its from the turnup end of casing ply described in tire axial outer side covers, And arrange between the bead filler adhesive tape and the fabric reinforcement,

On the outside of the tire axial of the bead core, the upper end of the metal shielding is located at than the turnup end closer to tire The position of radially inner side, the upper end of the fabric reinforcement is located at the position than the turnup end closer to tire radial outside, The upper end of the rubber cushion be located at than the fabric reinforcement upper end closer to tire radial outside position, under the rubber cushion End is arranged between the turnup and the metal shielding,

Using the tire radial distance from the lower end of the rubber cushion to the upper end of the metal shielding as H0, will be from the metal The tire radial distance of the upper end of enhancement layer to the turnup end as H1, will from the turnup end to in tire radially The tire radial distance of the upper end of the fabric reinforcement of nearest upper end as H2, by from the upper end of the rubber cushion to Used as H4, H1/H0 is 0.80-1.0 to the tire radial distance of the upper end of the fabric reinforcement of the radially nearest upper end of tire, H2/H4 is 0.60-0.90, and H0 and H1 are all higher than any one in H2 and H4.

2. Pneumatic belt tire according to claim 1, it is characterised in that

The Pneumatic belt tire possesses fabric reinforcement described at least two-layer, by the upper of at least two-layer fabric reinforcement Mutual tire radial distance is held as H3, H1/H0 is 0.80-1.0, H2/H4 is 0.60-0.90, and H3/H4 is 0.80-1.0, And H0 and H1 are all higher than any one in H2, H3 and H4.

3. Pneumatic belt tire according to claim 1, it is characterised in that

The rubber cushion is formed as follows, than the turnup end closer to tire radial outside part, the closer to this radially Outside and thickness get over it is gradually thinning.

4. Pneumatic belt tire according to claim 1, it is characterised in that

The bead filler adhesive tape includes：Downside gum filler, it is used to surround the bead core；And upside gum filler, its The tire radial outside of the downside gum filler is configured in, and rubber hardness is hard less than the rubber of the downside gum filler Degree,

The rubber hardness of the rubber cushion less than the downside gum filler rubber hardness, and the rubber hardness of the rubber cushion with The upside gum filler is equal or higher than it.

5. Pneumatic belt tire according to claim 4, it is characterised in that

The lower end of the rubber cushion is located at, outside the tire axial than the downside gum filler and the interface of the upside gum filler Position of the side closer to tire radial direction inner side.

6. Pneumatic belt tire according to claim 4, it is characterised in that

Liner is configured in the tire axial outside of the bead filler adhesive tape, and the rubber cushion is clamped in the liner and the upside Between gum filler, the rubber hardness of the liner is equal with the rubber hardness of the upside gum filler or higher than it.

7. Pneumatic belt tire according to claim 1, it is characterised in that

H1/H2 is 1.3-1.8.