CN103958219B

CN103958219B - High-capacity tyre

Info

Publication number: CN103958219B
Application number: CN201280058093.2A
Authority: CN
Inventors: 铃木俊秀
Original assignee: Sumitomo Rubber Industries Ltd
Current assignee: Sumitomo Rubber Industries Ltd
Priority date: 2011-11-25
Filing date: 2012-11-26
Publication date: 2016-08-31
Anticipated expiration: 2032-11-26
Also published as: WO2013077449A1; JP5564031B2; JP2013112060A; CN103958219A

Abstract

Thering is provided a kind of high-capacity tyre, this high-capacity tyre is configured to prevent the separation that belt ply layer occurs at shoulder main groove groove in the inner side in the radial direction of tire.High-capacity tyre includes carcass (6), belt (7), shoulder main groove groove (9) and belt yielding rubber (10).Belt (7) includes first to fourth belt ply layer (7A 7D).The outer end (7Ae 7Ce) of the first to the 3rd belt ply layer (7A 7C) is positioned to than axially external closer to tire of shoulder main groove groove (9).The outer end (7De) of the 4th belt ply layer (7D) is positioned to than shoulder main groove groove (9) closer to the axially inner side of tire.The inner (10e) of belt yielding rubber (10) is positioned to the inward flange line (L3) than shoulder main groove groove closer to the axially inner side of tire.The cross-sectional area (S) of the interior zone (10A) of belt yielding rubber (10) is from 2.5mm²To 20mm²In the range of.

Description

High-capacity tyre

Technical field

The present invention relates to the high-capacity tyre with the splendid fetus face of ruggedness.

Background technology

Fig. 4 illustrates the amplification cross-sectional view of the fetus face of the high-capacity tyre of routine.This load-carrying is taken turns Tire includes carcass (a) and belt (b).Belt (b) includes from carcass outside towards footpath First, second, third and fourth belt ply layer (b1-b4) of side sequentially stratification.Radially The axial length of outermost belt ply layer b4 is less than other three belt ply layer (b1 To b3) axial length.Additionally, have the belt buffering of general triangular shape of cross section Rubber (c) is arranged between the axial outer end portion of belt (b) and carcass (a).Belt Yielding rubber (c) reduces the stress on the end of belt (b).

Following patent document 1 discloses a kind of high-capacity tyre, and the feature of this high-capacity tyre is the Distance (d2) between two and the 3rd belt ply layer (b2, b3) is more than the first belt curtain Distance (d1) between layer of cloth (d1) and casingply (a), and buffer from belt The axial inner ends (c1) of rubber (c) is to the axial outer end of the first belt ply layer (b1) Distance is restricted to certain scope.The high-capacity tyre of patent document 1 has and prevents belt B effect that the end of () is damaged.

Patent document 1: Japanese Unexamined Patent Application announces No.H11-222008.

But, conventional high-capacity tyre does not accounts for the inner (c1) of belt yielding rubber (c) And the position relationship between shoulder main groove groove (e).

The inner (c1) of belt yielding rubber (c) is conventionally positioned at shoulder main groove groove (e) Axially external.The problem that accordingly, there exist is, stress during traveling easily concentrates on to be had The vicinity of shoulder main groove groove (e) of relatively thin rubber.And, it is being positioned at shoulder main groove groove (e) Centre belt ply layer (b1 to b3) between, shear strain occurs, and especially It is to tend to separating between belt ply layer (b2) with belt ply layer (b3).

Summary of the invention

The problem to be solved in the present invention

It is an object of the invention to the belt ply layer generation point preventing being positioned at below shoulder main groove groove From.

Solve the mode of this problem

In the present invention, high-capacity tyre include carcass, belt, belt yielding rubber and Shoulder main groove groove, carcass extends through the sidewall bead core to bead part from fetus face, band Bundle layer is arranged in fetus face the radial outside at carcass；Belt yielding rubber is arranged on belt Between axial outer end portion and the carcass of layer, belt yielding rubber has the transversal of general triangular Face shape, shoulder main groove groove be arranged on fetus face axially external on.Belt includes multiple Belt ply layer, each belt ply layer has the band being at an angle of setting relative to tire equator Bundle cord.With the order outside from carcass, belt ply layer include the first belt ply layer, Second belt ply layer, the 3rd belt ply layer and the 4th belt ply layer.First to the 3rd Each belt ply layer in belt ply layer has that to be positioned at the axle of shoulder main groove groove outside The axial outer end of side.4th belt ply layer has the axially inner side being positioned at shoulder main groove groove Axial outer end.In the tyre equatorial cross section including tire rotation axis, belt buffers The axial inner ends of rubber is positioned at the axially inner side of shoulder main groove groove inward flange line, shoulder main groove Groove inward flange line is at the channel bottom extending through shoulder main groove groove in the radial direction of tire Axially inner edge.Further, the cross-sectional area of the interior zone of belt yielding rubber from 2.5mm²To 20mm²In the range of, this interior zone is positioned at shoulder main groove groove inward flange The radially inner side of line.

Preferably, belt yielding rubber thickness on tire shoulder groove inward flange line from In the range of 2.0mm to 5.0mm.

Preferably, between axial inner ends and the shoulder main groove groove inward flange line of belt yielding rubber Axial distance in the range of from 7.5mm to 12.5mm.

Preferably, belt yielding rubber has the loss angle tangent (tan δ 1) less than 0.06.

The effect of the present invention

The high-capacity tyre of the present invention includes carcass, belt, belt yielding rubber and tire shoulder Main line, belt is arranged in fetus face the radial outside at carcass, belt yielding rubber Being arranged between the axial outer end portion of belt and carcass, belt yielding rubber has substantially three The shape of cross section of dihedral, shoulder main groove groove be located at fetus face axially external on.

The axle that the axial inner ends of belt yielding rubber is positioned at shoulder main groove groove inward flange line is inside Side, this shoulder main groove groove inward flange line extends through shoulder main groove groove along the radial direction of tire The axially inner edge of channel bottom.The cross-sectional area of the interior zone of belt yielding rubber From 2.5mm²To 20mm²In the range of, this interior zone is positioned in shoulder main groove groove The axially inner side of edge line.

In the high-capacity tyre of the present invention, therefore release the inner side acting on shoulder main groove groove On stress, and relaxed the shear strain of belt ply layer.This contributes to preventing at tire Near the radially inner side of shoulder main line between the second belt ply layer and the 3rd belt ply layer Separate.

In the high-capacity tyre of the present invention, the interior zone of above-mentioned belt yielding rubber has From 2.5mm²To 20mm²In the range of cross-sectional area, in order to more definitely prevent produce Estranged from.It is true that the area of the interior zone being additionally, since belt yielding rubber is limited in certain In fixed scope, therefore, it is possible to prevent the damage caused by the heating of belt yielding rubber.

Accompanying drawing explanation

Fig. 1 is the cross-sectional view of high-capacity tyre according to the embodiment of the present invention.

Fig. 2 is the enlarged drawing of the fetus face of Fig. 1.

Fig. 3 is the partial enlarged drawing of the shoulder main groove groove of Fig. 1.

Fig. 4 is the partial enlargement cross-sectional view of the fetus face of conventional high-capacity tyre.

Detailed description of the invention

Next, with reference to accompanying drawing, embodiments of the present invention are described.Fig. 1 is in standard state Under the high-capacity tyre 1 according to present embodiment including the tire meridian of tire rotation axis Cross section in line cross section.Fig. 2 is the enlarged drawing of the fetus face 2 of Fig. 1.Fig. 3 is Fig. 1 The partial enlarged drawing of shoulder main groove groove.

" standard state " represents that tire is installed on standard rim (not shown) and is filled Gas is to normal pressure but is not loaded the state of load.Unless otherwise noted, otherwise tire Each size is measured under " standard state ".

Herein, " standard rim " represents according to standard is the wheel rim that each tire determines, this mark Standard includes the standard of tire institute foundation, and standard rim is the standard for JATMA Wheel rim, " design wheel rim (Design Rim) " for TRA and with regard to ETRTO For " measure wheel rim (Measuring Rim) ".Additionally, " standard is intrinsic pressure " represents root It is the air pressure that each tire determines according to standard." normal pressure " represents according to standard is every It is intrinsic pressure that individual tire determines, this standard includes the standard of tire institute foundation, and just represents Maximum air pressure for JATMA, " inflate at various cold tires at table for TRA Tyre load limit value (TIRE LOAD LIMITS AT VARIOUS under pressure COLD INFLATION PRESSURES) " described in maximum and just " the blowing pressure (INFLATION PRESSURES) " for ETRTO.

As shown in fig. 1, the high-capacity tyre 1 of the present invention includes carcass 6, belt 7, band Bundle yielding rubber 10 and triangle rubber rubber 8, carcass 6 extends through sidewall from fetus face 2 Portion 3 is to the bead core 5 of bead part 4, and belt 7 is arranged in fetus face 2, at carcass 6 Radial outside, belt yielding rubber 10 is arranged on axial outer end portion and the carcass of belt 7 Between 6 and have the shape of cross section of general triangular, triangle rubber rubber 8 is with tapered side Formula extends from bead core 5 to the radial outside of tire.Fetus face 2 is provided with shoulder main groove groove 9 With crown main line 11, shoulder main groove groove 9 is arranged on the axially outermost, crown main line 11 It is arranged on the inner side of shoulder main groove groove 9 in the axial direction.

Carcass 6 includes that single casingply 6A, this casingply 6A include ring surface Shape main part 6a and turnup 6b, main part 6a extend through sidewall 3 from fetus face 2 To the bead core 5 of bead part 4, turnup 6b is axial from the inner side of tire around bead core 5 Ground anti-package is to the outside of tire.Casingply 6A is to cover, with top, the carcass that rubber covers The casing ply of line.Such as, the body cord of present embodiment all-steel cord manufacture and phase Tire equator C is tilted with the angle of 75 degree to 90 degree.

Triangle rubber rubber 8 is manufactured by vulcanie, and is arranged on the master of casingply 6A Between body 6a and turnup 6b.Triangle rubber rubber 8 in the way of tapered from bead core 5 Outwardly extend diametrically, in order to reinforcement sidewall 3 and the bending rigidity of bead part 4.

Shoulder main groove groove 9 extends and relative to tire equator C in the circumferential direction of tire It is symmetrically arranged.When travelling on wet road surface, this shoulder main groove groove 9 can be from tyre surface Water is discharged between portion 2 and ground.

Such as, crown main line 11 extends in the circumferentially continuous of tire and arrange In tire equator C.When travelling on wet road surface, this contributes to crown main line 11 It also is able to from discharging water between fetus face 2 and ground.As another embodiment, it is possible to Fetus face 2 arranges multiple crown main line 11.

Belt 7 includes that multiple belt ply layer, each belt ply layer have relative to wheel Abnormal red skin of infant road C is at an angle of the belt cord of setting.With from the radially outer order of carcass 6, band Bundle casing ply includes the first belt ply layer 7A, the second belt ply layer 7B, the 3rd belt Casing ply 7C and the 4th belt ply layer 7D.First belt ply layer 7A has relatively In the belt cord that tire equator C is arranged with the angle of 45 degree to 75 degree.Second belt curtain Each belt ply layer in layer of cloth 7B to the 4th belt ply layer 7D has relative to wheel The belt cord that abnormal red skin of infant road C is arranged with the angle of 10 degree to 35 degree.

At least two belt curtain in first belt ply layer 7A to the 4th belt ply layer 7D Layer of cloth tegillum is set to so that belt cord is the most crossing, to improve the adhesion on carcass.

As shown in Figure 2, first, second, and third belt ply layer 7A to 7C has respectively There are axial outer end 7Ae, 7Be and 7Ce.These axial outer end 7Ae, 7Be and 7Ce position Axially external at shoulder main groove groove 9.It is to say, as it is shown on figure 3, outer end 7Ae, Each in 7Be and 7Ce is positioned in the footpath of the RADIAL L1 by cross point P1 Laterally.Cross point P1 is to obtain by extending the outer surface 2o of fetus face 2 virtually Extended line obtains with by the axially external wall surface 9so of extension shoulder main groove groove 9 virtually Extended line intersect point.This rigidity contributing to improving tread shoulder portion 2s, this tyre surface tire Shoulder 2s is positioned at the axially external of the shoulder main groove groove 9 of fetus face 2.

Axial outer end 7De of the 4th belt ply layer 7D is positioned at the axle of shoulder main groove groove 9 To inner side.It is to say, as shown in Figure 3, outer end 7De is positioned through cross point P2 The axially inner side of RADIAL L2.Cross point P2 is by extending fetus face 2 virtually The extended line that outer surface 2o obtains and the axially inner side by extending shoulder main groove groove virtually The point that intersects of the extended line that obtains of trench wall surface 9si.This improve efficiently in tyre surface The rigidity of centre portion 2c, the biggest load acts on tyre surface central part 2c.Additionally, 4th belt ply layer 7D protects the first belt ply layer 7A to the 3rd belt ply layer 7C And carcass 6 etc..

Belt yielding rubber 10 has the shape of cross section of general triangular, in order to fill belt Gap between axial outer end portion 7e and the outer surface of carcass 6 of layer 7.This belt buffering rubber Glue 10 reduces on the outer end of the first belt ply layer 7A to the 3rd belt ply layer 7C Stress, and contribute to preventing the outer end 7Ae to 7Ce at belt ply layer 7A to 7C Place is initially separated.

In order to improve above-mentioned strain relief effect further, the compound bullet of belt yielding rubber 10 Property modulus E* be preferably provided in no more than 6MPa, more preferably no more than 4.5MPa In the range of.When the complex elastic-modulus E* of belt yielding rubber 10 is too small, belt 7 The rigidity of outer end 7e reduce, and control stability easily deteriorates.Therefore, compound bullet Property modulus E* be preferably provided in not less than 2MPa, more preferably not less than 3.5MPa In the range of.

When the loss angle tangent (tan δ) of belt yielding rubber 10 is excessive, belt buffers Rubber 10 may produce substantial amounts of heat in motion, and is arranged on the first belt ply layer Rubber between 7A to the 3rd belt ply layer 7C deteriorates due to heat, and more likely draws Rise and separate.More than in view of, belt yielding rubber 10 preferably has the loss less than 0.06 Angle tangent (tan δ).

In this manual, in the composite modulus of rubber and loss angle tangent (tan δ) Each is all defined as use, and by K.K.Iwamoto Seisakusyo, (Co., Ltd.'s rock is originally Making institute) the viscoelasticity spectrogrph that manufactures measures according to JIS-K6394 under the following conditions Value.

Initial strain: 10%

Amplitude: ± 2%

Frequency: 10Hz

Deformation pattern: stretching

Measurement temperature: 70 degrees Celsius.

In the tyre equatorial cross section including tire rotation axis, belt yielding rubber 10 Axial inner ends 10e is positioned at the axially inner side of shoulder main groove groove inward flange line L3, tire shoulder master Groove inward flange line L3 extends through the groove of shoulder main groove groove 9 along the radial direction of tire Axially inner edge 9bi of bottom 9b.

As shown in Figure 3, axially inner edge 9bi of the channel bottom 9b of shoulder main groove groove 9 The extended line that expression obtains by extending the channel bottom 9b of shoulder main groove groove 9 virtually is with logical Cross the prolonging of obtaining of axially external trench wall surface 9si extending shoulder main groove groove 9 virtually The cross point P3 that long line intersects.

In conventional high-capacity tyre, the inner 10e of belt yielding rubber 10 is positioned at tire shoulder Main line inward flange line L3's is axially external.To this end, act on the interior of shoulder main groove groove 9 Stress on side does not discharges fully and the most effectively.Therefore, at the mill of fetus face 2 In the mid-term damaged, often send out between the second belt ply layer 7B and the 3rd belt ply layer 7C Estranged from.

In the present invention, the inner 10e of belt yielding rubber 10 is positioned in shoulder main groove groove The radially inner side of edge line L3 so that belt yielding rubber 10 effectively alleviates and acts on tire Stress effect on the inner side of shoulder main line 9.This reduce and act on cutting on belt 7 Shear strain, and prevent radially inner side the second belt ply layer 7B at shoulder main groove groove 9 Separation with the 3rd belt ply layer 7C.Particularly, these effects are at tread shoulder portion 2s Have worn out and that load on the outer end of belt ply layer 7A to 7C has increased is each It is improved dramatically under situation.

As shown in Figure 2, belt yielding rubber 10 includes interior zone 10A, interior zone 10A is positioned at the axially inner side of shoulder main groove groove inward flange line L3.Interior zone 10A has Have from 2.5mm²To 20mm²Cross-sectional area S.It is less than when interior zone 10A has 2.5mm²Cross-sectional area S time, act on the stress on the inner side of shoulder main groove groove 9 Can not be adequately reduced and discharge, and easily separate.Especially, interior zone 10A preferably has not less than 9.0mm², more preferably not less than 14.0mm²Cross section Area S.

But, when the cross-sectional area S of interior zone 10A increases, in motion by carrying The heat increase that bundle yielding rubber 10 produces, and carry at the first belt ply layer 7A to the 3rd Between bundle casing ply 7C, rubber deteriorates due to heat, and is easily damaged.According to this respect, The cross-sectional area S of interior zone 10A is preferably provided in no more than 18mm², more preferably Ground is not more than 16.0mm²In the range of.

On shoulder main groove groove inward flange line L3, when the thickness (t) of belt yielding rubber 10 During reduction, acting on the stress near shoulder main groove groove 9 can not be alleviated fully, and It is susceptible to separate.Preferably, belt yielding rubber 10 has not less than 1.0mm, more The preferably no less than thickness (t) of 2.0mm.Thickness (t) when belt yielding rubber 10 During increase, belt yielding rubber 10 the heat increase produced, and at the first belt ply layer Between 7A to the 3rd belt ply layer 7C, rubber deteriorates due to heat, and is easily damaged. Likely can not obtain the smooth profile of arc carcass 6.Therefore, thickness (t) is not preferably In the range of 8.0mm, more preferably no more than 5.0mm.

Between the inner 10e and shoulder main groove groove inward flange line L3 of belt yielding rubber 10 Axial distance W is preferably provided in not less than 5.0mm, more preferably not less than 7.5mm In the range of.When axial distance W is less than 5.0mm, act on shoulder main groove groove 9 attached Near stress is not alleviated fully, and is susceptible to separate.But, axial distance W is preferably not more than 12.5mm.When axial distance W is big, belt yielding rubber 10 Size increase, and it is possible to reduce tyre surface central part 2c rigidity.

In this manual, the shape of cross section of interior zone 10A is considered as triangle, And cross-sectional area S passes through below equation (1) according to thickness (t) and axial distance W Calculate:

S=t × W × 1/2 ... ... ... (1)

Although the invention has been described in detail, but the invention is not restricted to above-mentioned being embodied as Mode, and various amendment can be carried out.

Example

The high-capacity tyre (size: 11.00R20) with the basic structure shown in Fig. 1 is made For sample based on the specification shown in table 1.Each tested impact resistance of test tire, Complex elastic-modulus E* after heat generation and traveling.Method of testing is as follows.

Each test tire is installed in wheel rim (20 × 8.00) and above and is inflated to 1000kpa Intrinsic pressure.Test tire travels on rotary drum with 40km/h, and this rotary drum includes at its table Produce the bulge of impact on face, and measure on fetus face without in the case of damaging feasible Sail distance.Bulge have record height for 25.4mm, the upper end be 30mm, the end be 70mm Trapezoidal cross-section, and circumferentially 65mm in length.Bulge is attached to turn Drum is to be positioned in shoulder main groove groove.Result uses index to show, the result of example 1 is 100.Be worth the biggest, then the ruggedness of fetus face is the best.

Each test tire intrinsic pressure be 23.68kN for 725kPa and load under conditions of quilt Be arranged on wheel rim, and then tire with the speed of 80km/h and the temperature of 35 degrees Celsius Travel on the rotary drum machine with smooth surface.After travelling two hours, measure tyre surface The temperature in portion.Radially inner side and radially outward distance the 3rd belt ply at shoulder main groove groove This temperature is measured in the position of the outer surface 2mm of layer.Result uses inverse display, example 1 Result be 100.Be worth the biggest, then when travelling, caloric value is the least.

After test tire travels under conditions of identical with heat generation test, test tire quilt Dismantle, and measurement is arranged on the radially inner side of shoulder main groove groove and in the second belt ply The complex elastic-modulus E* of the rubber between layer and the 3rd belt ply layer.Result uses inverse Display, the result of example 1 is 100.It is worth the biggest, complex elastic-modulus E* after travelling Minimizing the least.Less minimizing represent the second belt ply layer and the 3rd belt ply layer it Between shear strain little, and the less deterioration of rubber.

Being clear that from table 1, with compared with 1 and reference 2, example 1 is with balance Mode complex elastic-modulus E*, heat generation and impact resistance after traveling in terms of by more How to improve.

Reference annotates

2 fetus faces

3 sidewall

4 bead part

5 bead cores

6 carcasses

7 belts

8 triangle rubber rubber

9 shoulder main groove grooves

10 belt yielding rubbers

Claims

1. a high-capacity tyre, it includes

Carcass, described carcass extends through the sidewall bead core to bead part from fetus face；

Belt, described belt is arranged on the radial outside in described fetus face at described carcass；

Belt yielding rubber, described belt yielding rubber is arranged on the axial outer end portion of described belt And between described carcass, described belt yielding rubber has the shape of cross section of general triangular；With And

Shoulder main groove groove, described shoulder main groove groove is located at the axially external of described fetus face；Wherein

Described belt includes multiple belt ply layer, each band in the plurality of belt ply layer Bundle casing ply all has the belt cord being at an angle of setting relative to tire equator,

With the order outside from described carcass, described belt ply layer include the first belt ply layer, Second belt ply layer, the 3rd belt ply layer and the 4th belt ply layer,

Each belt ply layer in described first belt ply layer extremely described 3rd belt ply layer There is the axially external axial outer end being positioned at described shoulder main groove groove,

Described 4th belt ply layer has the axle of the axially inner side being positioned at described shoulder main groove groove Outward,

In the tyre equatorial cross section including tire rotation axis, the axle of described belt yielding rubber Inboard end is positioned at the axially inner side of shoulder main groove groove inward flange line, described shoulder main groove groove inward flange Line is at the axle of the channel bottom extending through described shoulder main groove groove in the radial direction of described tire Inward edge,

The cross-sectional area of the interior zone of described belt yielding rubber is from 9mm²To 20mm² In the range of, described interior zone is positioned at the radially inner side of described shoulder main groove groove inward flange line, And

The described axial inner ends of described belt yielding rubber and described shoulder main groove groove inward flange line it Between axial distance in the range of from 7.5mm to 12.5mm.

High-capacity tyre the most according to claim 1, wherein, described belt yielding rubber is at tire Thickness on shoulder groove inward flange line is in the range of from 2.0mm to 5.0mm.

High-capacity tyre the most according to claim 1, wherein, described belt yielding rubber has Loss angle tangent less than 0.06 i.e. tan δ 1.