CN101583501B - Pneumatic tire - Google Patents
Pneumatic tire Download PDFInfo
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- CN101583501B CN101583501B CN2007800485299A CN200780048529A CN101583501B CN 101583501 B CN101583501 B CN 101583501B CN 2007800485299 A CN2007800485299 A CN 2007800485299A CN 200780048529 A CN200780048529 A CN 200780048529A CN 101583501 B CN101583501 B CN 101583501B
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Abstract
A tire with a belt exhibiting high durability by enhancing the fatigue resistance of a cord especially at the end of a circumferential belt layer, especially a heavy loading radial tire with a small aspect ratio. The tire has a belt where at least one circumferential belt layer formed by coating with rubber a large number of cords extending along the equatorial plane of the tire, and at least two inclining belt layers formed by coating with rubber a large number of cords extending while inclining with respect to the equatorial plane O of the tire are arranged sequentially on the radial outsideof the crown of a carcass as a frame stretching toroidally between a pair of beads, and has treads arranged on the radial outside of the belt. The circumferential belt layer has a width equal to or l arger than 60% of the total width of the tire, at least one inclining belt layer has a width larger than that of the circumferential belt layer, and the modulus of elasticity of a cord arranged on theend side in the width direction is set smaller than that of a cord arranged on the inside in the width direction of the cord in the circumferential belt layer.
Description
Technical field
The present invention relates to a kind of air-inflation tyre, this air-inflation tyre has the circumferential bracing ply as band bundle portion, and in described circumferential bracing ply, for example reinforcing element such as cord or filament is extending on the direction of tire equator face.
Background technology
Band bundle portion about the carcass that is used for reinforced tire, Japanese kokai publication hei 2-208101 communique discloses a kind of structure, this structure has: around the two-layer at least intersection bracing ply of carcass setting, described cross-level comprises a large amount of cords or the filament as reinforcing element, described cord or filament intersected with each other and in the mode that becomes 10 ° to the 40 ° leaning angles in the scope with respect to the equatorial plane equatorial plane of tire is clipped between; And one deck is positioned at the below of described intersection bracing ply and the crown reinforced layer that is made of bar at least, and in described crown reinforced layer, for example a large amount of wavy or jagged cords or the reinforcing element of filament are arranged along the equatorial plane as a whole.
Summary of the invention
The problem that invention will solve
In recent years, because vehicle is for the demand of high speed performance and low chassis face position, the tire that is installed in the vehicle is made more and more flat, and therefore when tire was pressed inflation in standard, the radial expansion volume of fetus face had the correspondingly trend of increase.Because the increase of such radial expansion volume of fetus face has strengthened the stress concentration of band bundle end, and cause that the durability of band bundle end worsens, so become the major cause that early stage generation band Shu Duan peels off (belt end separation) especially.
Particularly, the problem with tire of less flat ratio (aspect ratio) is fetus face, and is big significantly when particularly near the radial expansion volume the tire shoulder portion is pressed in being in standard.In view of this, for example Japanese kokai publication hei 2-208101 communique proposed by comprise along tire circumferentially the circumferential bracing ply of the reinforcing element of configuration suppress the technology of tire radial expansion.
Yet, under the situation that the flat ratio of tire is done lessly, particularly, flat ratio be 0.7 or littler situation under, unless increase the width of circumferential bracing ply, otherwise be difficult to suppress the radial expansion of tire as expectation, flat ratio is the ratio of tire cross-section height/tire cross-section width.Yet the width that increases circumferential bracing ply will cause following new problem.
Particularly, under the situation of the width that increases circumferential bracing ply, when tire on the drive wheels when advancing, circumferentially the end of the Width of bracing ply in the ground area along circumferential direction flexural deformation, make bracing ply along circumferentially elongation, tension force input (below will be called as " tension force amplitude (tension amplitude) input ") is applied on the end of Width of circumferential bracing ply repeatedly and consumingly thus.Therefore, cord locates to become easy fracture by fatigue in the end of the Width of circumferential bracing ply.If the cord fracture by fatigue of circumferential bracing ply, then circumferentially bracing ply no longer can be born circumferential tension force, and tire no longer can keep its shape and can not use thus.
In view of the above problems, the objective of the invention is provides a kind of air-inflation tyre that is provided with the band bundle portion of high-durability by the fatigue resistance that improves the cord that uses in the end of circumferential bracing ply, and a kind of heavy load type belt tyre with less flat ratio particularly is provided.
The most serious problem that causes when increasing the width of circumferential bracing ply is the fracture by fatigue of the cord in the end of Width of circumferential bracing ply.This fracture by fatigue be because the tension force amplitude that acts on when tire is actuated to advance on the cord of end of Width of circumferential bracing ply is imported.Therefore, suppressing the input of tension force amplitude is necessary to addressing the above problem.
In view of this, as the enthusiasm result of study of the method that is used to suppress the input of tension force amplitude, proved that regulating the modulus of elasticity that is embedded in the cord in the circumferential bracing ply is unusual actv. for the fracture by fatigue that suppresses cord.
Particularly, key structure of the present invention aspect is as follows:
(1) a kind of air-inflation tyre, it has: as the carcass of skeleton, described carcass is across between the pair of bead portion with ring-type (toroidal shape); Band bundle portion, described band bundle portion is arranged in the radial outside of described carcass; And tyre surface, described tyre surface is arranged in the radial outside of described band bundle portion,
Described band bundle portion comprises: the circumferential bracing ply of one deck at least, and described circumferential bracing ply is arranged in the radial outside of the crown part of described carcass, and a large amount of cords that are coated with rubber that extended by the equatorial plane along described tire form; And two-layer at least inclination bracing ply, described inclination bracing ply is arranged on the described circumferential bracing ply, and described inclination bracing ply is characterized in that by forming along a large amount of cords that are coated with rubber that extend with respect to the equatorial plane O bevelled direction of described tire:
The width of described circumferential bracing ply be not less than described tire overall width 60%;
The width of at least one described inclination bracing ply is greater than the width of described circumferential bracing ply; And
The modulus of elasticity of first cord of end side of Width that is arranged in described circumferential bracing ply is less than the modulus of elasticity of second cord of the inboard of the Width that is arranged in described first cord.
(2) the described air-inflation tyre of first aspect (1) is characterized in that the cord of described circumferential bracing ply is formed from steel.
(3) the described air-inflation tyre of first aspect (1), it is characterized in that, described first cord of end side that is arranged in the Width of described circumferential bracing ply is the stretched metal cords with initial stage elongation, and described second cord of inboard that is arranged in the Width of described first cord is to form linearity, wavy or jagged non-elongation metal cords.
(4) the described air-inflation tyre of first aspect (1), it is characterized in that, but described first cord of end side that is arranged in the Width of described circumferential bracing ply is the tensile cords with initial stage elongation, and described second cord of inboard that is arranged in the Width of described first cord is to form wavy or jagged cord.
(5) the described air-inflation tyre of first aspect (1), it is characterized in that, described first cord of end side that is arranged in the Width of described circumferential bracing ply is an organic fiber cord, and described second cord of inboard that is arranged in the Width of described first cord is a metal cords.
(6) the described air-inflation tyre of first aspect (1) is characterized in that, described circumferential bracing ply is to form by helically coiling strip material on the crown part of described carcass, and this strip material is formed by at least one cord that is coated with rubber.
(7) the described air-inflation tyre of first aspect (1) is characterized in that, the end side of the Width of described circumferential bracing ply have width than the each several part of low elastic modulus all be described circumferential bracing ply overall width 5% to 20%.
(8) the described air-inflation tyre of first aspect (1), it is characterized in that, described first cord of end side that is arranged in the Width of described circumferential bracing ply at stretcher-strain be 1.8% o'clock modulus of elasticity at 40GPa in the scope of 100GPa, described second cord of inboard that is arranged in the Width of described first cord at stretcher-strain be 1.8% o'clock modulus of elasticity at 80GPa in the scope of 210GPa.
(9) the described air-inflation tyre of first aspect (1) is characterized in that, the each several part of the end side of the Width of described circumferential bracing ply all forms by described first cord that the helically coiling has than low elastic modulus.
The described air-inflation tyre in (10) the 9th aspects (9) is characterized in that, the coiling starting end of described first cord and the end end of reeling are positioned at the position of leaning on the inboard of Width than each outermost end of the Width of described circumferential bracing ply.
The effect of invention
According to the present invention, can increase the width of circumferential bracing ply, inhibition has the radial expansion of the tread of tyre portion of less flat ratio, especially can also suppress the fracture by fatigue of the cord in the circumferential bracing ply.Therefore, can provide the tire with less flat ratio, the durability of the band bundle portion of this tire is improved significantly.
Further,, can suppress to be arranged on the fracture of the cord in the Width outside consumingly according to the described structure in aforementioned (8) aspect of the present invention, suppress effectively simultaneously since tire to press the radial expansion of inflating the tyre surface end that causes in the standard.
Further, according to the described structure in aforementioned (2) aspect of the present invention, can suppress to inflate with pressure in the standard radial expansion of the tyre surface end that causes consumingly owing to tire.
Further, according to the described structure in aforementioned (9) aspect of the present invention, can high efficient and reliable the Width exterior lateral area of ground moulding enhancement Layer.
Further, according to the described structure in aforementioned (10) aspect of the present invention, as the coiling starting end of the cut end of the reinforcement cord in the Width outside with reel and finish end and finish end and prevent to expose, can prevent from from the coiling starting end thus or reel to finish the crackle of end beginning and peel off by the reinforcement cord in the outside of Width by being arranged in than coiling starting end and reeling.
Description of drawings
Fig. 1 is the expansion view according to the band bundle portion of the cutaway view of the Width of tire of the present invention and tire.
Fig. 2 is the view of analysing and observe according to the Width of the circumferential bracing ply of tire of the present invention.
Fig. 3 is the expansion view according to the band bundle portion of tire of the present invention.
Description of reference numerals
1 carcass
The circumferential bracing ply of 2a, 2b
3a, 3b inclination bracing ply
4 band bundle portions
5 tyre surfaces
6 low elastic modulus cords
7 high elastic modulus cords
O tire equator face
The width of circumferential bracing ply 2a of BW1 and 2b
The width of BW2 inclination bracing ply 3a
The overall width of TW tire
The specific embodiment
Describe in detail according to tire of the present invention with reference to Fig. 1, Fig. 1 illustrates the cross section along tire width direction.Particularly, among Fig. 1, tire has: carcass 1, and it is across between the pair of bead portion (not shown) with ring-type; Band bundle portion 4, it is arranged in the radial outside of carcass, band bundle portion comprises the one deck at least (being two-layer in the example that illustrates in the drawings) among circumferential bracing ply 2a and the 2b, circumferentially bracing ply is arranged in the radial outside of the crown part of carcass 1, and is extended and a large amount of cord of being coated with rubber constitutes by the equatorial plane O along tire; At least two-layer inclination bracing ply 3a and 3b (being two-layer in the example shown in the figure), it is arranged in the cord that makes on the circumferential bracing ply among one deck inclination bracing ply 3a and intersects with cord among another layer inclination bracing ply 3b, and each layer inclination bracing ply constitutes by a large amount of cords that extend on respect to the equatorial plane O bevelled direction of tire and be coated with rubber; And tyre surface 5, it is arranged in the radial outside of band bundle portion 4.
In the present embodiment, circumferentially the width B W1 of bracing ply 2a and 2b need be set at 60% of the overall width TW that is not less than tire, and narrower than the width of adjacent inclination bracing ply.At first, in order to suppress the radial expansion of tyre surface in a certain scope when tire is pressed inflation in standard, circumferentially the width of bracing ply need be at least 60% of overall tire width TW, this is that this zone must have the circumferential rigidity that is used to suppress radial expansion because the zone that presents bigger radial expansion is 60%～70% the zone that has covered the overall width TW of tire.Because the restriction of tire shape, circumferentially the upper limit of the width B W1 of bracing ply 2a and 2b be preferably tire overall width TW 90%.
Further, at least the width of one deck inclined belt bundle layer (being the width B W2 of inclination bracing ply 3a in the example that illustrates in the drawings) need be wideer than the width of circumferential bracing ply 2b, thereby guarantee that fetus face is for the performance of turning round that satisfies required inplane shear rigidity of resistance to abrasion (in-plane shear rigidity) and tire.
In the example shown in Fig. 1, circumferentially the width of bracing ply 2a is identical with the width of circumferential bracing ply 2b.Yet circumferentially the width of the width of bracing ply 2a and circumferential bracing ply 2b also can differ from one another.Especially, under the situation that circumferentially intensity of the Width central part of bracing ply increases, acceptable is, with the width of a circumferential bracing ply do broad, and the width of another circumferential bracing ply is done narrowlyer.
Improving the inplane shear rigidity of fetus face, especially improving aspect the resistance to abrasion of tire, the width of another inclination bracing ply 3b preferably is designed to wideer than circumferential bracing ply.In the example depicted in fig. 1, the width of inclination bracing ply 3a is wideer than the width of inclination bracing ply 3b.Under the identical situation of the width of these inclination bracing plys, rigidity produces sharply and changes, and therefore worries that the antistrip performance of belt ends may worsen.
The circumferential width of bracing ply do under the situation of broad, therefore the easier outer end that appears at the Width of circumferential bracing ply of the fracture by fatigue of cord is difficult to obtain long life of satisfied tire product.When tire is driven when travelling, because the input of the amplitude of tension direction is applied on the cord at place, outer end of Width of circumferential bracing ply, the therefore circumferential cord generation fracture by fatigue at place, the outer end of the Width of bracing ply.Therefore, deal with problems must these tension force amplitudes inputs of inhibition.Consider this point, in the present invention, at the circumferential place, end of the Width of bracing ply, the modulus of elasticity of first cord that is arranged in the Width outside of circumferential bracing ply is set to the modulus of elasticity less than second cord of the inboard of the Width that is arranged in first cord, thereby suppresses to concentrate on the tension force amplitude input on the end of Width of circumferential bracing ply.
Particularly, in the tire that travels on the ground, tension force amplitude input is applied on the end of Width of circumferential bracing ply.Because cord is elongated along circumferential direction, maximum tensional stress is applied to the ground plane place of tread of tyre end side, the cooresponding tensile stress of tensile stress when inflating to press in the standard with tire simultaneously is applied in the non-contact area of tyre surface end, these tension force amplitudes inputs therefore occur.Reduce the load that acts on the tire, promptly reduce the deflection of tire, can think to suppress a kind of method of the tensile stress width of cloth, but the good travelling comfort of this method and tire is incompatible.
When cord was elongated at the ground plane place along the tire circumferential direction, if lower corresponding to the modulus of elasticity of the end of the circumferential bracing ply Width of ground plane, the tensile stress that then acts on the cord was less.Yet in this case, if the modulus of elasticity of all cords circumferentially in the bracing ply is all reduced, the radial expansion volume when tire is pressed inflation in standard increases, and is difficult to keep the shape of tire.Therefore, the modulus of elasticity of the first outer distolateral cord of the Width by will being arranged in circumferential bracing ply is set at the modulus of elasticity less than second cord of the inboard of the Width that is arranged in first cord, when tire is pressed inflation in standard, the increase of radial expansion distributes as far as possible evenly, therefore suppress the stress amplitude at place, end of the Width of the circumferential bracing ply in the ground plane effectively, and can suppress the fracture by fatigue of cord.
It is that 0.3 to 0.8 times of modulus of elasticity of cord (second cord) of inboard that is arranged in the Width of first cord is an actv. for suppressing the above-mentioned tensile stress width of cloth that the modulus of elasticity of cord (first cord) in the outside that is arranged in the Width of circumferential bracing ply is set at.
Be arranged in the each several part of end side of the Width of circumferential bracing ply, the width t preferably circumferentially 5% to 20% of the overall width of bracing ply that promptly has the part (see figure 1) of less modulus of elasticity, under the above-mentioned width t of the described part of the end side that is positioned at Width situation less than the circumferential overall width 5% of bracing ply, because the cord with higher modulus of elasticity is present in the bigger zone of the stress amplitude that is applied on the circumferential bracing ply, therefore still might rupture.Under the situation of above-mentioned width t, be difficult to suppress the radial expansion of tire above the overall width 20% of circumferential bracing ply.
In the present embodiment, " modulus of elasticity of outer distolateral (first) cord that will be arranged in the Width of circumferential bracing ply is set at the modulus of elasticity less than (second) cord of the inboard of the Width that is arranged in first cord " specifically be meant cord 6 and the cord 7 with different modulus of elasticity be set rightly, shown in the cutaway view of the Width of the circumferential bracing ply of the plane outspread drawing of the circumferential bracing ply of Fig. 1 and Fig. 2.
Particularly, in the configuration of the cord shown in circumferential bracing ply 2a, 2b among Fig. 1 and Fig. 2, the many cords 6 (low elastic modulus cord) that will have lower modulus of elasticity are arranged in the end side of the Width of circumferential bracing ply, and a high elastic modulus cord 7 that manys that will have a modulus of elasticity higher than the modulus of elasticity of cord 6 is arranged in the band beam width direction inboard of low elastic modulus cord 6.
Example according to the basic configuration of circumferential bracing ply of the present invention comprises: one to tens of low elastic modulus cords 6 are arranged in the end side of the Width of circumferential bracing ply, and high elastic modulus cord 7 are arranged in the Width inboard of low elastic modulus cord 6.
The measured value of the tearing strain in the known ground plane is approximately 1.8%.Therefore, importantly, the modulus of elasticity of cord refers to the modulus of elasticity that tearing strain is 1.8% o'clock a cord.
For example, be called as " high elongation cord " (4 * (0.28mm+6 * 0.25mm)) metal elastic cord is suitable for as the low elastic modulus cord by many sth. made by twisting structure (multiple-twiststructure).For example, before the twisting filament, by applying hyper-elastic stress and the wire-shaped that will wait to constitute cord becomes the shape similar shapes of the final filament in the cord with twisting to filament in advance, twist filament then, can produce this high elongation cord like this.Yet,, be not preferred so high elongation cord is applied to whole circumferential bracing ply because above-mentioned high elongation cord is very expensive.
On the other hand, stand the cord (seeing the structure of the circumferential bracing ply 2b among Fig. 1) or the non-elongation cord of metal of wavy moulding or zig-zag moulding, promptly the layer of (3+9+15) * 0.23mm is twisted with the fingers cord, is suitable for use as the high elastic modulus cord.The modulus of elasticity of high elongation cord is to be generally less than the cord of wavy moulding or zig-zag moulding or the modulus of elasticity of the non-elongation cord of metal at 1.8% o'clock in tearing strain.Scheme can use organic fiber cord as the low elastic modulus cord as an alternative, uses metal cords as the high elastic modulus cord, also can satisfy the condition of modulus of elasticity recited above.
About the modulus of elasticity of low elastic modulus cord, when tire was pressed inflation in standard, the modulus of elasticity of 40 to 100Gpa scopes is suitable for suppressing radial expansion, and was compatible mutually with the fracture by fatigue at the place, end that suppresses circumferential bracing ply simultaneously.Similarly, about the modulus of elasticity of high elastic modulus cord, 80 to 210Gpa scope is suitable for suppressing the deterioration (relevant with vibrations) of travelling comfort, suppresses to inflate with pressure in the standard owing to tire the radial expansion of the tyre surface end that causes simultaneously satisfactorily.
In the present embodiment, the value obtained by following mode of " modulus of elasticity of cord " expression: take air-inflation tyre apart and collect cord under the coating rubber state; Cord is carried out extension test and makes stress-strain diagram according to test result; Then in the scaling system at the tangent slope (gradient) of 1.8% strain place, and remove thus obtained value with the sectional area of cord.When cord was cut out from tire, the cord that has the initial stage elongation in the tire was presented on the interior strain of 1.8% scope of the length when existing in the tire.
In Fig. 3, circumferentially the medial region in the above-mentioned width t zone of the zone (exterior lateral area t) of the width t on the end side of the Width of bracing ply and circumferential bracing ply for example can be constructed by following mode: have the shoestring of certain width by repeatedly reeling at the outside of carcass 1 helically, this shoestring is by one or cord that is coated with rubber 6 lesser amt and that put (juxtaposed) or 7 formations.Form circumferential bracing ply by helically coiling shoestring by this way, can form aforesaid exterior lateral area and medial region reliably with higher efficient.
In the present embodiment, when circumferential bracing ply is reeled above-mentioned shoestring when forming by helically, if as the coiling starting end of the cut end of cord 6 with reel and finish end and expose at the circumferential outermost end place of the Width of the exterior lateral area t of bracing ply, crackle and/or peel off and may or reel and finish the end generation to start with coiling starting end.Therefore, in the present embodiment, the coiling starting end of aforementioned cord 6 and reel to finish end and preferably all be positioned at than the outermost end of the Width of the exterior lateral area t of circumferential bracing ply position by the inboard of Width, thus can prevent above-mentioned crackle and/or peel off.
For the coiling starting end of the cord among the exterior lateral area t that makes circumferential bracing ply 6 with reel and finish end and all be positioned at than the outermost end of the Width of above-mentioned exterior lateral area t position by the inboard of Width, for example aforementioned shoestring is wound up into the outermost end of the Width of exterior lateral area t towards the outside helically of Width from the inner of the Width of exterior lateral area t, to form the exterior lateral area t of circumferential bracing ply at radially inner side, make shoestring reverse then through the Width of tread surface, and shoestring is wound up into the inner of the Width of exterior lateral area t from the outermost end of the Width of exterior lateral area t towards the inboard helically of Width, to form the exterior lateral area t of circumferential bracing ply 2b at radial outside.
Example
Belt structure shown in Fig. 1 is applied to all size shown in the table 1, makes thus and be used for truck or city motor bus is of a size of the tire of 435/45R22.5 to be used for test.Thus obtained each tire and the wheel rim that is of a size of 14.00 * 22.5 are assembled together.After the interior pressure of tire is adjusted to 900kPa, in rotary drum (drum) load is that 63.7kN, rotary drum rotating speed are under the situation of 60.0km/h, make each tire travel 30 on rotary drum, 000km cuts tire and confirm the quantity of the cord of fracture by fatigue in the circumferential bracing ply then.Test results is shown in Table 1 with the form corresponding to the exponential quantity of the value that is expressed as 100 conventional example.The quantity of the cord of the more little expression fracture by fatigue of exponential quantity is few more, thereby durability performance is good more.
" modulus of elasticity " expression in the example of the present invention is when carrying out extension test by instron type stretcher to every cord, in tearing strain is the modulus of elasticity of measuring in 1.8% o'clock, and the modulus of elasticity of every cord is expressed as with respect to expression or is converted to the exponential quantity of elastic mould value of the cord of 100 conventional example.The more little expression modulus of elasticity of exponential quantity is more little.The layer of (1+6) * 0.32mm is twisted with the fingers cord be applied to bracing ply with the cord density of 24.5/50mm.With 4 * (the high tension cord of 1 * 0.28mm+6 * 0.25mm) is applied to the end of the Width of circumferential bracing ply with the cord density of 20/50mm, simultaneously the wavy cord of non-elongation of (3+9+15) * 0.23mm is applied to the inside of the Width of circumferential bracing ply with the cord density of 22.5/50mm.
Table 1
| Conventional example | Comparative examples | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Overall tire width | 435 | 435 | 435 | 435 | 435 | 435 | 435 |
| The width (mm) of |
300 | 300 | 300 | 300 | 300 | 300 | 300 |
| The width (mm) of |
360 | 360 | 360 | 360 | 360 | 360 | 360 |
| The cord angle (degree) of |
50 | 50 | 50 | 50 | 50 | 50 | 50 |
| The width (mm) of |
330 | 330 | 330 | 330 | 330 | 330 | 330 |
| The cord angle (degree) of |
50 | 50 | 50 | 50 | 50 | 50 | 50 |
| The modulus of elasticity (index) of the low elastic modulus cord of circumferential bracing ply | 100 | 120 | 90 | 80 | 60 | 80 | 60 |
| The high elastic modulus cord of circumferential bracing ply | 100 | 100 | 100 | 100 | 120 | 120 | 120 |
| Modulus of elasticity (index) | |||||||
| The width of low |
30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Durability (cord fatigue crack-resistant: index) | 100 | 150 | 60 | 25 | 0 | 20 | 0 |
| ?Q(mm) | - | 30 | 30 | 30 | 30 | 0 | 0 |
| ?R(mm) | - | 30 | 30 | 30 | 30 | 0 | 0 |
| Band bundle portion's durability evaluating (index) | 100 | 95 | 115 | 121 | 126 | 110 | 112 |
Further, will according to the coiling starting end of the cord among the exterior lateral area t in each illustrated tire of the present invention and circumferentially the distance table between the corresponding end of the Width of bracing ply be shown Q (mm), and with the coiling of cord finish end and circumferentially the distance table between the same side of the Width of bracing ply be shown R (mm).These distance values are shown in the table 1.In example of the present invention, the value of Q and R is zero and means the structure that forms in the following way: begin the cord of reeling from each outermost end of the Width of circumferential bracing ply among exterior lateral area t; With the width t of cord towards the inboard coiling exterior lateral area of Width; Make cord reverse then through the Width of tread surface, and cord is wound up into each outermost end of the Width of circumferential bracing ply, the coiling starting end of the reinforcement cord in the exterior lateral area and reel and finish each end that end is exposed to the Width of circumferential bracing ply thus.
Further, each above-mentioned tire is assembled together with the wheel rim that is of a size of 14.00 * 22.5.After the interior pressure of tire is adjusted to 900kPa, each tire shifted onto wants on driven rotary drum, and make tire be applied under the situation of load of 49.0kN speed operation thereon with 60km/h, up to owing to peel off break down till.Test results (time before fault occurs) illustrates with the form corresponding to the exponential quantity of the value that is expressed as 100 conventional example in Fig. 1.The big more expression durability performance of exponential quantity is good more.
Utilizability on the industry
The present invention is applicable to the Pneumatic tire for heavy load industrial field, and described tire has the circumferential belt that is made of the reinforcement cord of basically burying underground abreast with the equatorial plane of tire.
Claims (11)
1. air-inflation tyre, it has: as the carcass of skeleton, described carcass is across between the pair of bead portion with ring-type; Band bundle portion, described band bundle portion is arranged in the radial outside of described carcass; And tyre surface, described tyre surface is arranged in the radial outside of described band bundle portion,
Described band bundle portion comprises: the circumferential bracing ply of one deck at least, and described circumferential bracing ply is arranged in the radial outside of the crown part of described carcass, and a large amount of cords that are coated with rubber that extended by the equatorial plane along described tire form; And two-layer at least inclination bracing ply, described inclination bracing ply is arranged on the described circumferential bracing ply, and described inclination bracing ply is characterized in that by forming along a large amount of cords that are coated with rubber that extend with respect to the equatorial plane O bevelled direction of described tire:
The width of described circumferential bracing ply be not less than described tire overall width 60%;
The width of at least one described inclination bracing ply is greater than the width of described circumferential bracing ply;
The modulus of elasticity of first cord of end side of Width that is arranged in described circumferential bracing ply is less than the modulus of elasticity of second cord of the inboard of the Width that is arranged in described first cord; And
Described first cord of end side that is arranged in the Width of described circumferential bracing ply at stretcher-strain be 1.8% o'clock modulus of elasticity at 40GPa in the scope of 100GPa, described second cord of inboard that is arranged in the Width of described first cord at stretcher-strain be 1.8% o'clock modulus of elasticity at 80GPa in the scope of 210GPa.
2. air-inflation tyre according to claim 1 is characterized in that the cord of described circumferential bracing ply is formed from steel.
3. air-inflation tyre according to claim 1, it is characterized in that, described first cord of end side that is arranged in the Width of described circumferential bracing ply is the stretched metal cords with initial stage elongation, and described second cord of inboard that is arranged in the Width of described first cord is to form linearity or wavy non-elongation metal cords.
4. air-inflation tyre according to claim 1, it is characterized in that, but described first cord of end side that is arranged in the Width of described circumferential bracing ply is the tensile cords with initial stage elongation, and described second cord of inboard that is arranged in the Width of described first cord is to form wavy cord.
5. air-inflation tyre according to claim 1, it is characterized in that, described first cord of end side that is arranged in the Width of described circumferential bracing ply is an organic fiber cord, and described second cord of inboard that is arranged in the Width of described first cord is a metal cords.
6. air-inflation tyre according to claim 1 is characterized in that, described circumferential bracing ply is to form by helically coiling strip material on the crown part of described carcass, and this strip material is formed by at least one cord that is coated with rubber.
7. air-inflation tyre according to claim 1 is characterized in that, the end side of the Width of described circumferential bracing ply have width than the each several part of low elastic modulus all be described circumferential bracing ply overall width 5% to 20%.
8. air-inflation tyre according to claim 1 is characterized in that, the each several part of the end side of the Width of described circumferential bracing ply all forms by described first cord that the helically coiling has than low elastic modulus.
9. air-inflation tyre according to claim 8 is characterized in that, the coiling starting end of described first cord and the end end of reeling are positioned at the position of leaning on the inboard of Width than each outermost end of the Width of described circumferential bracing ply.
10. air-inflation tyre according to claim 3 is characterized in that, described wavy be zig-zag.
11. air-inflation tyre according to claim 4 is characterized in that, described wavy be zig-zag.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006349481A JP4842117B2 (en) | 2006-12-26 | 2006-12-26 | Pneumatic tire |
| JP349481/2006 | 2006-12-26 | ||
| JP041811/2007 | 2007-02-22 | ||
| JP2007041811A JP4841456B2 (en) | 2007-02-22 | 2007-02-22 | Heavy duty pneumatic tire |
| PCT/JP2007/075025 WO2008078794A1 (en) | 2006-12-26 | 2007-12-26 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101583501A CN101583501A (en) | 2009-11-18 |
| CN101583501B true CN101583501B (en) | 2011-04-27 |
Family
ID=39657255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800485299A Expired - Fee Related CN101583501B (en) | 2006-12-26 | 2007-12-26 | Pneumatic tire |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4842117B2 (en) |
| CN (1) | CN101583501B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4841456B2 (en) * | 2007-02-22 | 2011-12-21 | 株式会社ブリヂストン | Heavy duty pneumatic tire |
| JP2009166661A (en) * | 2008-01-16 | 2009-07-30 | Bridgestone Corp | Pneumatic tire |
| JP2010155553A (en) * | 2008-12-26 | 2010-07-15 | Bridgestone Corp | Pneumatic radial tire |
| JP5334249B2 (en) * | 2009-01-19 | 2013-11-06 | 株式会社ブリヂストン | Pneumatic tire |
| JP2012020673A (en) * | 2010-07-15 | 2012-02-02 | Bridgestone Corp | Pneumatic tire |
| EP2463119B1 (en) | 2009-08-05 | 2017-05-03 | Bridgestone Corporation | Pneumatic tire |
| JP5620537B2 (en) | 2013-04-03 | 2014-11-05 | 株式会社ブリヂストン | Pneumatic tire |
| US20160023517A1 (en) * | 2014-07-22 | 2016-01-28 | The Goodyear Tire & Rubber Company | Reduced weight aircraft tire |
| JP6861542B2 (en) | 2017-03-08 | 2021-04-21 | 株式会社ブリヂストン | Pneumatic tires |
| CN110494302A (en) * | 2017-04-11 | 2019-11-22 | 株式会社普利司通 | Elastomer metal cord composite object and the tire for using it |
| JP2019104471A (en) * | 2017-12-14 | 2019-06-27 | 株式会社ブリヂストン | tire |
| JP2019209752A (en) * | 2018-05-31 | 2019-12-12 | 株式会社ブリヂストン | Pneumatic tire |
| CN112867609A (en) | 2018-10-17 | 2021-05-28 | 株式会社普利司通 | Tyre for vehicle wheels |
| US20210354515A1 (en) * | 2018-10-17 | 2021-11-18 | Bridgestone Corporation | Tire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5746853A (en) * | 1995-11-08 | 1998-05-05 | Compagnie Generale des Etablissements Michelin - Michelin Cie | Radial heavy-duty truck tire with crown reinforcement having a multipartite ply |
| CN1809474A (en) * | 2003-05-21 | 2006-07-26 | 株式会社普利司通 | Pneumatic tire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4190059B2 (en) * | 1998-08-19 | 2008-12-03 | 株式会社ブリヂストン | Pneumatic radial tire |
-
2006
- 2006-12-26 JP JP2006349481A patent/JP4842117B2/en not_active Expired - Fee Related
-
2007
- 2007-12-26 CN CN2007800485299A patent/CN101583501B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5746853A (en) * | 1995-11-08 | 1998-05-05 | Compagnie Generale des Etablissements Michelin - Michelin Cie | Radial heavy-duty truck tire with crown reinforcement having a multipartite ply |
| CN1809474A (en) * | 2003-05-21 | 2006-07-26 | 株式会社普利司通 | Pneumatic tire |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平6-32110A 1994.02.08 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101583501A (en) | 2009-11-18 |
| JP4842117B2 (en) | 2011-12-21 |
| JP2008155857A (en) | 2008-07-10 |
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