CN1128069C - Pair of high-transverse-curvature tyres, in particular for two-wheeled vehicles, method of controlling behaviour of such vehicles on bend and front tyre of said pair - Google Patents

Abstract

The present invention relates to a high and transverse curvature tire pair especially used for two-wheel motor vehicles. A belt structure of a back tire comprises a layer of cord threads which are basically arranged at an angle of zero degree correspondingly to the equatorial plane of a tire, wherein the cord threads are preferably wound on an elastic material sheet reinforced by aromatic polyamide slurry and can not extend. The belt structure of the back tire comprises at least one radial outer layer of the cord threads which can not extend, and the cord threads are basically arranged at an angle of zero degree correspondingly to the equatorial plane of the tire, and are distributed in the mode of axial change density; the other reinforced layer arranged in an inner position in the radial direction is preferably arranged, and the zero-degree cord threads are preferably high elongation rate metallic cord threads made of high carbon steel wires.

Description

The high-transverse-curvature tire that is used in particular for two-wheeled vehicle is right

Technical field

The present invention relates to two-wheeled vehicle, more particularly, it is right to relate to the high-transverse-curvature tire that is used in particular for two-wheeled vehicle, relates to a tire, particularly front tyre of described tire centering, and relates to a kind of by the method for described tire to the control vehicle performance.

The tire that The present invention be more particularly directed to a kind of two-wheeled vehicle is right, wherein, all is not less than the cross curvature that 0.15 cross curvature is higher than corresponding rear tyre in the front tyre under any property condition.

More particularly, the present invention relates to the structure of described tire centering, in other words, it is right to the present invention relates to a kind of tire, its tire is provided with the carcass plies of a radial structure, preferably have a shape ratio (H/C)≤80% and/or its on mounting rim, wheel rim width is more than or equal to 60% of tire nominal cord (nominal cord).

Background technology

As everybody knows, when two-wheeled vehicle when curvilinear path is travelled, it tilts in the bend outside, forms an angle that is called " camber angle ", can reach 65 ° with respect to vertical its value of ground-surface; Because this running, tire cause a camber thrust of offsetting with the centnifugal force that acts on the vehicle.

Tire had a ply structure originally, and it comprises two-layer rubbery knot thing, reinforces with cord, favour tire equatorial plane symmetrically, be commonly referred to the cross ply structure, also a band structure can be arranged, also be to be made of double-type rubbery fabric strip, its cord favours the equatorial plane of tire.

Above-mentioned ply structure can form important camber thrust; In addition, tire is to having performance very balanced on bend, though the two-wheeled tire is of different sizes, they apply the approximate camber thrust of character, and these camber thrusts are enough to the centrifugal thrust of equilibrium activity on vehicle substantially.

Therefore, steering vehicle difficulty especially on bend, vehicle has the driving performance of balance, as long as thereby chaufeur inclination of vehicle just can be travelled along curvilinear path, and need not to adjust its attitude, particularly the deflection angle of handle.

Levy top description in order to test, motorcycle driver can expect that certainly they can need not to grasp handle along negotiation of bends, and as long as move its center of gravity.

Yet also have problems: ride the traveling comfort of sailing, the directional balance of vehicle and the fatigue of driving in following direction; These are all relevant with the excessive rigidity of tire, and tire construction is accumulated elastic energy under the metamorphosis that applies, and when stress stopped, its moment bounce-back was disturbed thereby amplified from ground-surface, and this makes vehicle loses stability.Particularly when travelling on straight way, above-mentioned excessive rigidity causes high frequency (8-10Hz) vibration (shimmy of front wheels effect) on front tyre when low speed, and causes the vibration of low frequency (3-4Hz) when high speed on vehicle, thereby it is unstable that driving variable is got.

In order to overcome the problems referred to above, recently adopted the bracing plies tire, it has the band structure of a weaving or metal cords formation, particularly rear tyre is provided with a band structure, it comprises that the preferably metallo-cord of (being in a kind of exclusive mode sometimes) circumferencial direction twines, front tyre then has a kind of band structure, and it is provided with the radially overlapping bar of inclination cord.

This tire is to certainly making moderate progress aspect traveling comfort and the driving stability riding to sail: in fact the vehicle vibration during the high speed straight disappears, and rear tyre has important damping of vibrations, and still, the shimmy of front wheels effect substantially changes.

But the improvement of performance has caused a new problem on straight way, and the cord strip structure that the radial structure of tire is arranged together with circumferencial direction (0 °) can not produce desirable camber thrust, and this also is related to the requirement of augmented performance day by day of vehicle.

More particularly, compare the lower and different in kind (it is linear) of the thrust that rear tyre provides with the thrust (curve) of front tyre.Therefore, Zhuan Bei vehicle has lost balance quality (neutral behaviour) like this, and has obtained oversteer performance (over-steeringbehaviour); On bend, trailing wheel can not be offset the centnifugal force of the increase that acts on axis, slippage on a fixed point, thus tending to shift out its track to the bend outside, front tyre is the inboard of close bend then.

In other words, when the radius of curvature of speed increase and track reduces, no longer be with the compensation action of centrifugal force only by inclination of vehicle, thereby no longer can guarantee the stability of travelling: need to increase the thrust that applies by tire, this increase changes vehicle attitude and obtains by being operated by handle by chaufeur, those skilled in the art is referred to as " hand push turns to (push steer) ", that is to say, make the rolling plane of front tyre angle that is called " distortion angle " of tangential tilt with respect to curvilinear path, this angle towards with the crooked opposite direction of track.

So just obtain a sufficient thrust, it is the summation of camber thrust and slip flare, and camber thrust is that tire equatorial plane produces with respect to vertical plane inclination, and the slip flare is that front-wheel rolling Plane Angle changes and causes.

The structure and the performance characteristic of dividing the value task distortion angle to depend on front tyre, this and a following spot correlation, that is, tire can transmit the thrust of adding its camber thrust and being applied by rear tyre between the value of the value of distortion angle and slope thrust.

But need a kind of opposite operation when shifting out bend, those skilled in the art is referred to as " pull and turn to (pull steer) ", that is, handle is tilted to mention vehicle towards curve inner side, and it is travelled along curvilinear path once more.Therefore, the tire by vehicle outfitting is to remarkable control vehicle performance, therefore must select and the checking tire right.

Someone has proposed to carry out the technical scheme of this work, and patent documentation EP0280889 proposes a kind ofly to carry out above-mentioned selection and need not to test the method for control, according to the technical scheme of this patent, if the response (slip response) of sliding is defined as S ₁And S ₂, that is, respectively for forward and backward tire, the function of contact distortion angle and slope thrust, so, function S ₂-S ₁The tire that shows as monotone increasing function will be to being acceptable.

In fact, said method is not dealt with problems, and this is because the inflation pressure of tire is also depended in the response of sliding, under any circumstance, the absolute value of neither one as a result: in fact, although some tire is to meeting above-mentioned rule, but they are not acceptable, and opposite situation is also arranged.

EP 565339 A1 disclose a kind of motor cycle tire, this tire comprises a carcass plies, this carcass plies has organic fiber cord layer and band structure of at least one radial arrangement, this band structure has at least one band cordline, the basic equatorial plane helix winding abreast with tire of at least one band cord.The band cord has the 600kgf/mm of being not less than ²The modulus of elasticity in direct stress, and be arranged to have the cord density that is lower than shoulder at middle body.Above-mentioned band structure can improve the high speed durability and the steering stability of tire.But, in this document, propose to make front tyre and have the right technical matters of rear tyre group of zero degree band structure with this specific character.

The flat 5-319019 of TOHKEMY discloses a kind of radial tyre of motor bike, and belt wherein is to be made of the cord with oval cross section.Described cord helix is twined, and at the middle body of tyre surface, narrow line length axis normal is in the outer surface of carcass plies, and in the shoulder regions of tyre surface, long axis almost is parallel to the outer surface of carcass plies.

Summary of the invention

According to the present invention, the applicant has now be sure of to exist a kind of diverse ways that solves the problem that above-mentioned new tire causes; This method does not also lie in the existence of the problem of bearing and attempts and select tire with effective and efficient manner in a large amount of forward and backward tires, so that form an acceptable tire to or the combination, the invention reside in the right structure of the above-mentioned tire of design to avoid occurring the problems referred to above, make and equipped the right vehicle of tire of the present invention and have the balance quality on bend and the performance of absorbing vibration and damping again.

First aspect of the present invention relates to the method that a kind of control is contained in the right overall slope thrust of tire on the power actuated vehicle, more particularly, relate to a kind of method by tire construction control performance of motor vehicle, preferable relate to a kind of at least in the band structure of front tyre, the consistency of the reinforcing cord of one deck cord that the change circumferencial direction is provided with, thus control is along the method for the slope thrust that vehicle acted on of curvilinear path.

A second aspect of the present invention relates to the tire of two-wheeled vehicle, it comprises the bracing plies of the toroidal shape of a high-transverse-curvature, this carcass plies has a central bizet and two lateral sidewalls that end at a pair of bead, and bead is used for tire is anchored at corresponding mounting rim; One is applied to tread strip on the described carcass plies along bizet, and the not extensible band structure of circumferencial direction that is interposed between described carcass plies and the tread strip, it is characterized in that:

The band structure of rear tyre comprises at least one radial outer, and it is made of the cord circle of a plurality of axial circumferencial directions side by side, and cord twines to become zero angle substantially with respect to tire equatorial plane,

The band structure of front tyre comprises at least one radial outer, it is provided with a plurality of cord circles that become zero angle to be provided with substantially with respect to plane, tire mark road, it, and preferably includes one and is arranged on radially at interior locational additional consolidating layer with the consistency axial distribution that changes from an end of described band structure to the other end.

The right tire of described tire preferably has and is not less than 0.3 curvature ratio, and the curvature ratio of rear tyre is lower than front tyre.

Radial outer in the band structure of rear tyre is by single cord or comprise that the rubbery fabric arrowband of 2 to 5 high elongation rate metal cords constitutes, they are executed formula from an end of described bizet to other end spiral shell and are wrapped on the carcass plies according to the angle that becomes zero degree with respect to tire equatorial plane substantially.

About front tyre, the cord circle of the radial outer of band structure comprises the metal cords of high elongation rate, its distribution consistency increases gradually to the band structure two ends from equatorial plane, and on the either side of plane in the zone of preset width, above-mentioned consistency is no more than every centimetre of 8 cords under the line.

The cord circle of at least one preferably is wrapped in radially on interior locational another consolidating layer in described layer, in first embodiment, described another consolidating layer is an elastic material sheet, and between described cord circle and carcass plies, but the disperse of filling sticking device is in described elastomeric material.

Perhaps, according to another embodiment, the described radially internal layer that is preferably in the band structure of front tyre can comprise the bar that two axial side by side relationship are provided with, wherein be provided with reinforcing member, with respect to tire equatorial plane, reinforcing member is in each bar medium dip orientation, and in two bars opposed orientation.

Reinforcing member in the described radially internal layer can be selected from comprise textile cord and metal cords one group; In addition, the material of the reinforcing member among in described can be different from the material of the reinforcing member in the radially adjoining bar.

Radially internal layer about the elastic material sheet formation, the sticking device of disperse in described elastomeric material preferably is evenly distributed on the fiber of the short fibrillar structure of aromatic poly amide in the described elastomeric material, the density of its unit volume is 0.5% to 5% of cumulative volume, preferred orientations orientation preferably on the circumferencial direction or that favour above-mentioned equatorial plane.

In any embodiment, described radially internal layer can be at the equatorial plane place of tire, and being preferably on axially extended 10% to 30% the part of described band structure at a width is relaying.

Description of drawings

Now by way of example rather than the mode that limits, contrast the following drawings describes the present invention in detail.

Fig. 1 is the cross-sectional figure according to tire centering rear tire of the present invention.

Fig. 2 is the cross-sectional figure according to tire centering front tyre of the present invention.

Fig. 3 represents the different alternate embodiments of the band structure of front tyre with schematic plan view.

Fig. 4 is the qualitative curve figure of slope thrust and camber thrust combination in right two tires of above-mentioned tire and known front tyre.

The specific embodiment

Consulting Fig. 1 now, is 1 according to the label of the high-transverse-curvature tire that is used in particular for trailing wheel in the power actuated vehicle of the present invention.

As everybody knows, the cross curvature of tire is defined as tyre surface center to tyre surface two ends C line b-b's, under the line between the distance h t of the last measurement of plane X-X and the above-mentioned tyre surface two ends apart from the ratio between the wt, in the tire of two-wheeled vehicle, it is a very high value, usually above 0.15, and this ratio is usually less than 0.05 in the motor tire.

If the tyre surface two ends are for example not easy to identify owing to lack accurate benchmark (as the bight of label C indication among Fig. 1), so, fully can be with the measured value of the maximum chord length in the tire as distance wt.

The value of above-mentioned cross curvature is called " curvature ratio ", is also referred to as " tyre surface curvature " usually.

In tire of the present invention, this value is preferably between 0.15 and 0.45.

Tire 1 comprises a ply structure 2, and it comprises at least one carcass plies 3, and two relative lateral margin 3a is replication on corresponding bead core 4.Elastic filling substance 5 is applied on the outer peripheral edges of bead core 4, occupies the space between the lateral margin 3a of carcass plies 3 and the corresponding replication of cord ply.

As everybody knows, comprise that the tire region of bead core and charges constitutes bead, its structure can be anchored on tire on the corresponding mounting rim (not shown).

One band structure 6 matches with carcass plies, it is made of one or more cord 7, on the carcass plies bizet from an end to the other end, arrange with relation parallel and side by side, constitute the cord circle 7a of basic many circumferencial directions on the tire rolling direction, the equatorial plane " one-tenth zero degree " that is commonly referred to respect to tire is arranged.Above-mentioned band structure preferably is made of a single cord or a fillet rubbery fiber (comprising 5 cords that are arranged side by side of as many as), and they are from one end to the other side spiral winding on described carcass plies bizet.

Above-mentioned cord is the known metal cords of high elongation rate (HE) preferably, and its purposes and feature have been described in detail in No. 0461646, the applicant's European patent EP, and details is just consulted the document.

In brief, above-mentioned cord constitutes by some, and the bar number is 1 to 5, is preferably 3 to 4, and every single line by some constitutes, and the line number is 2 to 10, is preferably 4 to 7.Diameter is greater than 0.10mm, is preferably in the scope of 0.12-0.35nm.The spiral in the same direction winding of line in bar and the bar in cord, for line and bar, the pitch of winding can be identical, also can be different.

Above-mentioned cord preferably is made of high-carbon steel wire (HT silk),, contains the carbon more than 0.9% that is.Specifically, in a concrete sample of the applicant preparation, the layer of spiral winding 9 is made of single cord 7, and cord 7 is called 3 * 4 * 0.20 HE HT cord, from an end of band structure to the spiral winding of the other end.Above-mentioned sign defines a kind of metal cords, and it is with unidirectional winding, constitutes by three, and every is that four single lines of 0.20mm constitute by diameter, and the meaning of abbreviation HE is " high elongation rate ", and the meaning of abbreviation HT is " high tensile power " steel, that is, and and high-carbon steel.

The final percentage elongation of above-mentioned cord is between 4% and 8%, and this is the known performance of leading of a kind of representative type, is called " spring performance (spring behaviour) ", is that the tire of body plan and molded above-mentioned high-transverse-curvature is necessary.

Special recommendation is used metal cords not get rid of and is used other cord, specifically, can adopt adequate measure if necessary, can use known aromatic poly amide textile fibres, for example can lay one deck zero degree cord, be made of weaving (aromatic poly amide) cord and metal (HE) cord in two adjacent side direction positions at midway location, vice versa.The spiral winding technology of different cords on carcass plies is known, repeats no more here.

One tread strip 8 is applied on the band structure 6 in known manner, and tire is by the tread strip kiss the earth.

As shown in Figure 1, the cord circle 7a that is formed by cord 7 preferably is wrapped on the supplemental support 9, and this supporting member is made of the elastomeric material that a slice is clipped between cordline 7 and the carcass plies 3 substantially.

Above-mentioned supplemental support 9 is carried out different functions.At first, in the step of preparation band structure, because it adheres to rerum natura and structural drag, it makes cord circle 7a remain attached to together easily, makes band structure 6 have enough structural stabilities in its manufacturing process and the control step before the assembling of band structure and ply structure 2.When finishing sulfuration, in the tire in use, supplemental support 9 can bring further benefit to the performance characteristic of tire, and specifically, it can be increased in the thrust performance in the slip.Therefore, supplemental support 9 should approach as much as possible; To limit its weight, owing to this supporting member is arranged in the tire region of radius maximum, thereby it is playing very great function aspect the generation centnifugal force.

In order to make and use the supplemental support 9 that suitably reduces thickness, propose according to the present invention, the batching (the natural rubber based batching that preferably contains 30 to 70phr carbon black) that constitutes supplemental support is provided with the reinforcing casting resin of the even dispersion that is made of bonder, but, and do not change its attachment characteristic substantially so that increase the mechanical resistance and the tensile properties of elastomeric material under the state of giving birth to.Recommend to use aromatic poly-amide thick liquid (poly--to the fiber of the short fibrillar structure of phenylene-terephthalate amine (poly-para-phenylene-terephthalamide)) on the one hand at this, its trademark is " Kevlar slurry " or " Twaron slurry " (Kevlar and Twaron are respectively the registered trade mark (RTM)s of DuPond and Akzo).

The final tensile strength that the elastomeric material of being reinforced by above-mentioned aromatic poly amide has under ecology is 3 to 7MPa, and percentage elongation is 50% under 0.6 to 3MPa tensile stress.

Have been found that disperse aramid fibre in constituting the elastomeric material batching of supplemental support 9, this supporting member can be made very thin sheet, still, in the crude tyre manufacturing process, but can stop the plastic deformation and the stress that wherein produce.

In more detail, have been found that in the living batching of elastomeric material and put into the aromatic poly-amide thick liquid of 1 to 10phr (umbers of per 100 parts of rubber weight), and use 0.1 to 2.5mm long fiber, can reach optimum efficiency.In fact, in tire is made, can produce with used thickness be 0.075 to 0.5mm, be preferably about 0.25mm or thinner supplemental support 9.

Calendering supplemental support 9 can further increase the resistibility to different stress, aramid fibre is orientated in advance with preferred direction in the elastic material sheet that constitutes supplemental support itself, at least can be the horizontal of tire in the employed this preferred direction of tire centering of the present invention, if but get in the vertical to resemble also and can obtain good effect.

In Fig. 2, when being used for the tire of two-wheeled vehicle, the label that is particularly suitable for being installed in the high-transverse-curvature tire on the front-wheel is 2.

As everybody knows, have good turning to property and stability in order to make vehicle, front tyre must have the cross-sectional width that reduces, and just because of this point, has produced the high-transverse-curvature of tyre surface.

In according to the right front tyre of tire of the present invention, the value of above-mentioned curvature is more preferably greater than 0.30, more preferably greater than this value of corresponding trailing wheel.

In its most general structure, and for the feature of clearly not describing in this article, it is different what Fig. 2 institute target tire and tire shown in Figure 1 do not have, so used identical label in two figure.

Front tyre also comprises a band structure 6 that is applied on the carcass plies bizet, and it comprises the radial outer 7 of at least one reinforcing member, and reinforcing member is in a circumferential direction, and above-mentioned band structure preferably also comprises the radially internal layer 9 of at least one reinforcing.This radially internal layer be equivalent to supplemental support 9 in the rear tyre basically, difference is that structure is more multiple surplus in front tyre.

Reinforcing member in the radial outer preferably with above-mentioned rear tyre in the cord of identical type, with circumferencial direction, that is, be wrapped on the carcass plies with zero degree.

In this case, above-mentioned radial outer also is made of many cord circles, the cord circle is preferably formed on the carcass plies bizet by spiral being wrapped in the arrowband that is at least a cord or some (best 2 to 5) cord, but, this winding is preferably carried out with the pitch that changes, in all cases, the consistency of its variation increases gradually from the two ends of mediad band structure.

Although the changeability of spiral winding itself and pitch all will cause the winding angle of a non-zero degree, it is very little that the value at this angle keeps, and can always think that it is a zero angle.Specifically, in the present invention, be no more than 5 °, " equaling zero degree substantially " can be thought in the angle that preferably is no more than 3 °.Be also pointed out that along the periphery of band structure it is that unmodified twines pitch, because the effect of carcass plies curvature always causes variable consistency in the axial direction.

According to the present invention, the distribution consistency of cord 7 circles, the end along the place layer from equatorial plane to two is preferably according to a predetermined relationship change.According to the applicant's test, above-mentioned relation can be expressed as easily: $N_X=K\frac{R^2}{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="C9711580900201.png,C9711580900211.png"\; state="\{\{state\}\}">r</figure-callout>}}^2}\mathrm{No}$

Wherein,

No is the number of the cord circle that is provided with in plane either side unit value (for example 1cm) central length under the line;

R is the center of the described central length in outermost layer radially and the distance between the tire axis of rotation;

R is center of one of described unit length in the zone between radially outermost center and two ends and the distance between the tire axis of rotation;

K is constituent material and a structure of considering cord, and the rubber mass on the cord, and the weight of the radially outermost layer of nearest described unit length part and the parameter of establishing, it changes when the bizet profile changes in the architectural feature of the bar of material category and band structure, disperses from a reference value.

Have same structure and all connect under the identical situation of materials at cord in the extension of whole layer, this parameter is got and is equaled 1 value substantially, and extends at the periphery along band structure, and when material and reinforcing member structural change, this parameter is then got different values.

Although being in the axial consistency of 0 ° cord changes to some extent, cord distribution according to above-mentioned relation can guarantee in tire uses, because the homogeneity of the stress of centrifugal action on band structure, this is needed for realizing the rigidity that changes in the axial direction, and this point will be explained below.

Those skilled in the art obviously can be found out other relation, depend on above-mentioned design variable, this relation can it realize in the axial direction different-stiffness and the homogeneity of stress in the tire band structure in use by the consistency that changes described cord in controlled and pre-mode simultaneously.

Those skilled in the art can also use said method to make the band structure of rear tyre band structure and two tires, the different characteristics of two kinds of tires is combined, so that realize the balance quality (neutral behaviour) of power actuated vehicle in slip.

About the consistency of the zero degree cord in the equatorial plane either side zone that occurs in maximum rarefaction, it should not surpass every centimetre of 8 cords, is preferably every centimetre of 3 to 6 cords.

Above-mentioned zone is preferably band structure axially extended 10% to 30%.

Cord quantity in above-mentioned middle section equals a value of 60% to 80% near the cord quantity of tire shoulder, and near the cord consistency the tire shoulder should not surpass every centimetre of 10 cords, is preferably every centimetre of 6 to 8 cords.

Consider above-mentioned radially internal layer now, for its manufacturing different alternate embodiments can be arranged, according to concrete requirement, those skilled in the art can be optimum a kind of from wherein selecting.

Radially the reinforcing member of internal layer can be under any circumstance all to be in to become crisscross independent line or cord with equatorial plane, also can be to reinforce weighting material such as fibrefill, it can arbitrarily be placed, but preferably places according to preferred orientations parallel with equatorial plane or that intersect.

The reinforcing member of above-mentioned layer can be monofilament and/or yarn that kink or non-twisting, and they can be multiple textile material such as natural fiber or synthetic material such as acid amides, nylon and aromatic poly amide, perhaps metallic material.

Be to be noted that in the following description, will always be to use term " cord ", this term is meant single line or the non-yarn that kinks when upper and lower literary composition fills Xu Shizong.

At first, described layer can be included in two radially stacked bar 9a of the rubbery fabric of the reinforcing member formation in the elastic matrix, 9b, reinforcing member is in mutual intersection in two bars, and preferably favour symmetrically on two preferred orientations of equatorial plane X-X and be orientated, its mode is similar to the band structure of prior art substantially.

The basic difference of new-type band structure and prior art band structure is that on the plane either side big zone (band structure axially extended 10% to 30%), new-type band structure has lower rigidity under the line; This lower rigidity can obtain easily by following manner, that is, to the consistency of described reinforcing member, or to constituent material, or described reinforcing member disposed with respect to the orientation of equatorial plane, or the combination of above-mentioned measure.Above-mentioned rigidity value can be represented according to different modes, for example represents (all other conditions are identical) by the consistency of described reinforcing member, still, more generally is to represent by coefficient of elasticity or in the tensile stress of the described radially internal layer of upwards measuring in wheel week; The rigidity of described layer preferably be no more than cooresponding band structure of the prior art rigidity 65%.

Specifically, material, when structure is identical with the laying angle, plane either side under the line, favouring on the direction of equatorial plane, the overall consistency of reinforcing member that intersects at the right section (right section) of unit width is no more than, and is preferably lower than the reinforcing member density (every centimetre of about 14 cords) of prior art band structure.

Described cord is 18 ° to 50 ° with respect to the angle of equatorial plane, is preferably 22 ° to 45 °.

According to the alternate embodiment of a recommendation, described under the line plane place interrupt, thereby form axially extended 10% to 30% the regional a (Fig. 3) that a width is described band structure, in this zone, only have circumferential reinforcing cord 7.

The advantage of technique scheme is, can select described suitable consistency value and correspondingly not encrypt the central bizet of band structure for the side direction part of band structure.

Specifically, the consistency value that has been found that nylon cord title 940/2, every centimetre of 4 to 8 cords be suitable for 30 ° to 50 ° with respect to the angle of orientation radially use.

In the embodiment of a special recommendation, two bars are that the cord by same material constitutes, and in another embodiment, the cord material of a bar is different from another cord material, for example can select nylon/aromatic poly amide or aromatic poly amide/metallic combination; In this case, the angle of the described cord in the afore mentioned rules scope is preferably mutually different and be asymmetric.

In a kind of alternate embodiments, radially internal layer is by axially constituting with two bars of side by side relationship setting along peripheral profile, each bar is provided with and favours the reinforcing member of equatorial plane on crisscross, and therefore, these two formation are herringbone reinforcing member structure substantially.In this case, side by side two also can keep close mutually, perhaps also can engage along the vertical edge of facing mutually, perhaps separate fully mutually.As what in the situation of stacked bar, point out, between the described vertical edge of facing, keep identical axial width seemingly useful.

Top description about constituent material, orientation and the consistency of the reinforcing member of described two bars also is applicable to the bar of just having retouched art.

In another advantageous embodiments of the present invention, described radially internal layer is made of elastic material sheet 9e, as the sheet in the rear tyre 9, resembles at the bar 9c that has described, and the situation of 9d is the same, and it can be continuous or interrupt in plane X-X place under the line; This sheet is preferably filled the reinforcing weighting material that disconnected chopped fiber constitutes, chopped fiber disperse disorderly is in elastomeric material, but preferably be orientated with circumferencial direction, axial predetermined direction, perhaps when sheet 9e be by two differences and when axially adjacent sheet constitutes, to favour the aspect orientation of tire equatorial plane.

In this said circumstances, the linear consistency of the fiber of not known where to begin, but must consider its unit volume distribution density: this density is preferably 0.5% to 5% of cumulative volume.Described thickness is no more than 1mm, be preferably in 0.3 and 0.8mm between.

Described weighting material is the same with top description as rear tyre band structure supporting member 9 to be identical.

Fig. 4 represents for some tire the slope thrust that tire applies and the combination of camber thrust in mode qualitatively.In present the marking on a map this combination of expression be when changing at the vehicle inclination angle kilogram (y axis of coordinate) and standard operation pressure, rated load and usually the degree (x axis of coordinate) under the condition of the wheel rim that uses of vehicle represent.Straight line a and p represent the above-mentioned function of the forward and backward tire that tire of the present invention is right respectively.

Line c then represents to have the slope thrust that front tyre applied of prior art of the band structure that the cross-cord bar constitutes and the combination of camber thrust.

As can be seen, this combination is a curvilinear function, and it still is a curvilinear function with the basic of rear tyre for the function of straight line combines.

This means basically, the vehicle that is equipped with by the forward and backward tire of performance shown in line a and the c has a kind of bend performance, it is along with changing with respect to the ground-surface inclination angle, this is because the thrust combination in two tires is not linear, it is the combination of thrust (rear tyre) Yu the non-rectilinear thrust (front tyre) of straight line, therefore, need the continuous adjustment of vehicle attitude.

As can be seen, go up from qualitative, thrust a and p then are desirable functions, specifically, basically be linear function, therefore, its combination also is linear function basically, and its value changes in continuously uniform mode with the vehicle inclination angle, therefore, vehicle has the balance quality of turning around a curve, does not need the adjustment to handle in other words, and only needs to increase the inclination angle gradually with the centnifugal force increase.

In order to assess according to tire of the present invention to resulting qualitative results, carried out series of road and trajectory tests, and with tire of the present invention pair and commercially available best brand, the cooresponding tire that is used for same model is to contrasting.

These tires are tires of usually producing of applicant and two kinds of tires that are judged as two kinds of different manufacturers best, the rival under normal driving and limit riving condition.

The feature of used vehicle is as follows:

Motor bike HONDA CBR 1000F

Front tyre specification 120/70 ZR17

Inflation pressure 2.5bars

Wheel rim 3.50-17

Rear tyre specification 170/60 ZR17

Inflation pressure 2.9bars

Wheel rim 5.50-17

Road operation test is in order that the qualitative level of most important performance characteristic of band structure is depended in assessment in motion especially, and subjective determination changes into 1 to 7 fen, and it is right that top score shows the tire of optimum performance of every kind of assessment feature.Tire identification is as follows:

A: tire of the present invention is right

The B:PIRELLI tire is to (the present MTR01 that produces; MEZ2)

C: first kind of tire of rival is right

D: rival's the 2nd kind of tire is right

It should be noted, each structure that the different comparative tires that more than one features are different mutually are right and performance characteristic and not separated assessment, and just assess the overall performance that tire is equipped, it is by all features of finished product, mainly is influenced by the band structure type of two tires.On the other hand, the special purpose of test is the assessment tire of the present invention pair total result of comparing with present commercially available best tire equipment.

In all scenario, right tire is made by following mode to constitute tire of the present invention:

Front tyre has with the radially double-deck cord of artificial silk (title 1220/2) cord and a band structure that is made of the radial outer of metal cords 3 * 4 * 0.20 HE HT; Its final percentage elongation is corresponding to 6%; The distribution consistency increases to maximum at every centimetre of 8 cords of shoulder from the minimum of a value of every centimetre of 4 cords of equatorial plane; As previously mentioned; Be entwined by the arrowband of two cords is spiral; Radially the thickness of internal layer is 0.5mm; Be mixed with aromatic poly-amide thick liquid; It is oriented to circumferencial direction

The band structure layer that rear tyre has the radially double-deck cord that has nylon (title 1400/2) cord and is made of the arrowband of three steel cords of 3 * 4 * 0.20 HE HT type, its percentage elongation is corresponding to 6%, under the tension force of about 400 grams, with spiral being wrapped on the carcass plies of axial winding pitch of 5mm.

In contrast, two kinds of tires of rival are basic identical, front tyre has the radially double-deck cord of nylon, and the bar of a pair of radially stacked band structure, it is provided with aramid cord, intersects mutually symmetrically in two bars, the distribution consistency is every centimetre of 9 cords, inclination angle with respect to equatorial plane is 23 °, and according to prior art, all above-mentioned values are along wheel crown part directional survey.Its rear tyre is provided with the double-deck cord of nylon and the band structure that is made of the aramid cord of circumferencial direction, and cord is respectively per minute rice 130 lines and per minute rice 160 lines to depend on the spiral winding of different consistencies of tire.

Following table be different kinds of tyre between comparing result:

Table

Test/tire A B C D

The sensivity 755 4.5 of front-wheel runout

Driving performance 7666

Cushioning ability 7665

Steering stability 7765

Deceleration and stopping performance 7 5.5 4 4.5

Traveling comfort 766 5.5

As can be seen, it is right that the right performance of tire of the present invention is better than rival's tire generally, the sensivity aspect of front-wheel runout particularly, and the damping performance of road pavement injustice and deceleration and stopping performance, i.e. directional balance and stopping distance.

The present invention has realized all purposes, has particularly eliminated the bad cushioning ability of effect of front-wheel runout and front tyre road pavement injustice, and in the oversteer of glancing impact on bend and the tendency of vehicle rise.

Tire of the present invention is to having recovered the balance quality on bend fully, this is to realize by the band structure of novel front tyre, it is provided with the cord in the zero degree winding of middle section rarefaction, in fact, this structure makes tire have linear reaction on bend, promptly, with the qualitative identical reaction of rear tyre, thereby the reaction of two tires combination, the vehicle reaction on bend is still linear reaction, and the result has balance quality when driving.

In addition, because the rigidity of front tyre band structure totally descends, above-mentioned being reflected between two tires obtains balance, and can further be regulated by the lateral stiffness that increases rear tyre simultaneously, the increase of rear tyre lateral stiffness is to realize by the mode of setting up supplemental support, and supplemental support is to be made by the elastomeric material that strengthens with aromatic poly-amide thick liquid.

Astonishing and opposite with all expections is, by making the vehicle performance that on bend, restores balance, the rigidity of front tyre band structure reduces, in conjunction with performance characteristic with rear tyre, band structure no longer has been absolutely necessary at the needs that its side direction partly has high transverse stiffness, yet this in the past rigidity but is necessary, so that the slope thrust that supporting is caused by the distortion angle that is applied on the front tyre when negotiation of bends.

Therefore, in front tyre, use the reinforcing internal layer of wall scroll or two bars, become for particular vehicle or concrete tire construction optionally, be suitable for the measure of situation needs, this reinforcing internal layer is preferably in central tread portion and interrupts, so that lotus is closed following two-fold, and competing needs, that is the high rigidity during, at the highly flexible of band structure under the straight way driving conditions with in negotiation of bends.In fact, in two side direction part of band structure, compensated because the rigidity that the bar of replacement normal tape structure causes reduces at reinforcing member with respect to orientation on equatorial plane crisscross.

Specifically, whole consistency value by the control reinforcing member, and the laying angle of the reinforcing member of control lower floor can realize from a zone to the rigidity value of the different band structure in another zone, this rigidity value increases towards the band structure end, so that absorb and reduce the vibration that Uneven road causes, simultaneously become big important horizontal thrust, thereby make tire have good directional balance and the big insensitivity of front-wheel runout with the vehicle inclination angle, and high driver comfort.

Also find beyond expectationly, owing to be provided with the one deck that has the zero degree reinforcing member, and reinforcing member consistency in the axial direction changes, thereby make band structure that bigger deformability be arranged, this has improved the vehicle stability of braking on straight way and bend, act on changing the speed of a motor vehicle and car in different driving conditions that qualitative change does not take place power on two tires during load.Specifically, in the braking maneuver process, load distribution between the tire of front and back is born variation, but when the time in negotiation of bends, this situation does not produce thrust and interrupts on the front tyre of zero degree band structure, yet but can produce on the tire of prior art, this is because its thrust function that is relevant to the vehicle inclination angle is non linear cause.

Except that above-mentioned situation, described band structure is provided with the zero degree reinforcing member, has bigger flexiblely, thereby can make tire increase the area that contacts with ground in braking, so reduce the car brakeing distance, and this helps driving safety.

In a single day those skilled in the art has understood aforesaid the present invention, just can realize whole selections, variation and the correction of variable related to the present invention, and this helps him to solve the concrete technical matters that he must handle.

Claims (16)

1. the tire of two-wheeled vehicle is right, and described tire comprises the bracing plies of a toroidal shape, and it has a central bizet and two is the sidewall of termination with a pair of bead, and bead is used for tire is anchored at corresponding mounting rim; One is applied to tread strip on the described carcass plies along the bizet direction; And be located between described carcass plies and the tread strip at the not extensible band structure of circumferencial direction, it is characterized in that:

The band structure of rear tyre comprises at least one radial outer, and it is made of the cord circle (7a) of a plurality of axial circumferencial directions side by side, and cord (7) twines to become zero angle substantially with respect to tire equatorial plane,

The band structure of front tyre comprises at least one radial outer, and it is provided with a plurality of cord circles that become zero angle to be provided with substantially with respect to tire equatorial plane, its from an end of described band structure to the consistency axial distribution of the other end to change.

2. the tire of two-wheeled vehicle according to claim 1 is right, it is characterized in that: the curvature ratio of described tire is not less than 0.3, and the curvature ratio of rear tyre is lower than front tyre.

3. the tire of two-wheeled vehicle according to claim 1 is right, it is characterized in that: the described cordline of the band structure in rear tyre is that a rubbery fabric arrowband that comprises 1 to 5 high elongation rate metal cords constitutes, its on described carcass plies from an end of described bizet to the other end, being the spiral winding in angle of zero degree substantially with respect to tire equatorial plane.

4. the tire of two-wheeled vehicle according to claim 1 is right, it is characterized in that: the described cord circle of the radial outer in the band structure of front tyre comprises the high elongation rate metal cords of being made by high-carbon steel wire.

5. the tire of two-wheeled vehicle according to claim 4 is right, it is characterized in that: the consistency of described cord circle increases gradually from the band structure both ends, the unit width zone of plane either side under the line, and its value is no more than every centimetre of 8 cords.

6. the tire of two-wheeled vehicle according to claim 1 is right, it is characterized in that: the cord circle of the described radial outer in the band structure of at least one in described tire is wrapped at least that another is in radially on interior locational consolidating layer.

7. tire according to claim 6 is right, it is characterized in that: the described radially internal layer in the band structure of at least one in described tire is to interrupt on axially extended 10% to 30% the part of described band structure at the equatorial plane place of tire at a width.

8. the tire of two-wheeled vehicle according to claim 6 is right, it is characterized in that: described radially internal layer is made of a slice elastomeric material (9), it is interposed between band structure (2) and the carcass plies (3), comprises the hookup of disperse in described elastomeric material.

9. the tire of two-wheeled vehicle according to claim 8 is right, it is characterized in that: described hookup is the reinforced fibers weighting material, and its material is to select from comprise weaving, metal or glass fibre one group.

10. tire according to claim 9 is right, it is characterized in that: described reinforced fibers weighting material is the aramid fibre of short fibrillar structure.

11. tire according to claim 10 is right, it is characterized in that: disperse is in described elastomeric material equably for described reinforced fibers weighting material, and the density of its unit volume is 0.5% to 5% of cumulative volume.

12. tire according to claim 9 is right, it is characterized in that: described reinforced fibers weighting material is along a preferred orientations orientation that favours described equatorial plane.

13. the tire of two-wheeled vehicle according to claim 6 is right, it is characterized in that: in the band structure of front tyre, described radially internal layer is that the bar by axially facing constitutes, be provided with reinforcing member in the bar, with respect to the tire equator face, reinforcing member is orientated in each bar medium dip, and is opposed orientation in described.

14. the tire of two-wheeled vehicle according to claim 13 is right, it is characterized in that: described radially be from comprise textile cord and metal cords one group, to select with the reinforcing member of internal layer.

15. the tire of two-wheeled vehicle according to claim 13 is right, it is characterized in that: described radially internal layer is included in two radially overlapping bars of equatorial plane both sides, they are provided with reinforcing member, with respect to tire equatorial plane, reinforcing member is orientated in each bar medium dip, and is opposed orientation in two bars.

16. the tire of two-wheeled vehicle according to claim 15 is right, it is characterized in that: the material of the reinforcing member in one of described is different with the material of the reinforcing member of radially adjoining.

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