CN101298227B - Tire with asymmetric tread pattern and method of mounting the tire - Google Patents

Abstract

This invention relates to a tire suitable in a passenger car, particularly a tire being high in the resistance to hydroplaning on a wet road surface and low in the tire noise and having an asymmetric tread pattern. In such a tread pattern that at least two circumferential grooves extending along an equatorial plane of the tire are formed in a region of a tread surface at an axially inner side with respect to the equatorial plane in the mounting on the vehicle and at least one circumferential groove is formed in a region at an axially outer side thereof, a circumferential groove nearest to theequatorial plane of the tire among the circumferential grooves arranged in the axially inner side region has a width wider by 20% or more than an average groove width of the tire and a circumferential groove arranged toward a side of a tread end at the axially inner side region has a width corresponding to 90-110% of the average groove width, and the circumferential groove nearest to the equatorial plane of the tire at the axially outer side region has a width narrower by 10% or more than the average groove width, whereby the resistance to hydroplaning and the controllability of tire noise, which have a conflicting relation in the prior art, are established in a higher level.

Description

Have the tire of asymmetric tread pattern and the method that this tire is installed

The application be that on 09 01st, 2003, application number are 03823080.1 the applying date, denomination of invention divides an application for the application of " having the tire of asymmetric tread pattern and the method that this tire is installed ".

Technical field

The present invention relates to a kind of tire that is applicable in the Passenger motor vehicle (below be also referred to as car), more particularly, the present invention relates to a kind ofly have high resistibility and low tire and a kind of method that is used to install described tire of tire noise for the tyre slip on moist road surface (hydroplaning) phenomenon.

Background technology

Existence is about the various documents of tire with asymmetric tread pattern, and when with described mounting of tyre on self-propelled vehicle the time, described asymmetric tread pattern is specified the inboard of self-propelled vehicle and the direction in the outside.

For example, disclosed in non-patentability document 1, commercially available tire with non-symmetrical design constitutes by following manner, promptly divide a plurality of functions, thereby a part that the equatorial plane with respect to tire of tyre surface is in the axial outside of self-propelled vehicle is used to improve turning efficiency, and will be used to improve drainage performance at the axial remainder at inboard place.As constructive method commonly used, make the ratio or the negative ratio of the pattern groove area on the tyre surface contact surface less, so that it is bigger to be arranged in the pattern block rigidity in the axial outside that is installed in the tyre surface on the self-propelled vehicle, make negative ratio big simultaneously so that the pattern block rigidity in the axial inboard is less.

In addition, shown in " Monthly Tire; March of 2003; New Producthighlights ", has such example, that is, attempt by arranging a circumferential main pattern groove in the axial exterior lateral area of the tyre surface on self-propelled vehicle, installed and arranging in axial medial region that two circumferential main pattern grooves and inclination pattern groove improve the noise that produces such as wet road rideability, by column resonance and in the conflict performances such as wearing and tearing of the axial outside of self-propelled vehicle.In this example, the common rideability on moist road surface is used as wet road rideability, and does not specifically mention resistivity for the tyre slip phenomenon.

Yet; when (that is, under with the state of mounting of tyre on self-propelled vehicle) estimates the performance of the tire with said structure under the state that uses tire in reality, can produce such problem usually; that is, can not realize the control and the opposing tyre slip of tire noise.

And, in the example of JP-A-10-217719, disclosed wet road rideability, but the situation that the causes the tyre slip phenomenon darker situation of the depth of water normally, it is not comprised in the common moist road surface disclosed in this example.

Summary of the invention

Made the present invention for the problem that solves conventional art, and the present invention proposes a kind of like this technology, that is, realize to improve simultaneously to the resistibility of tyre slip with to the control of tire noise, and this all is a kind of conflict relationship to a great extent up to now.

The inventor at length studied such a case, promptly, can not realize the control and the opposing tyre slip of tire noise, and confirm that the common trait in these two kinds of performances is such, that is, producing on the tire that is installed on the self-propelled vehicle that the shape of contacting to earth with respect to ground-surface flare and tire is different from respect to ground-surface camber angle is 0 ° situation.That is to say that conventional art has problem on this point as described below, that is, tyre performance is not best under the state that is installed on the self-propelled vehicle.

And, the inventor at be used for except improving control, also guaranteeing to the resistivity of tyre slip and tire noise self-propelled vehicle on dry pavement stability and the technological means of abrasion resistance carried out various researchs.That is to say, the inventor has been noted that actual use and with the state of mounting of tyre to the self-propelled vehicle, the particularly attitude of the tire of under this state, being installed (camber angle, toe-in etc.) and ground contact shape and draining and current (elementary stream), and the understanding of several (a)-(d) below after at length analyzing them, having obtained.

(a) almost in all self-propelled vehiclees, all tire is installed in the mode of toe-in or inward camber slightly.

(b) therefore, long ground contact portion is shifted to the axial inboard of self-propelled vehicle from the equatorial plane of tire, thereby in order to improve steering stability, from the viewpoint of contact area of ground and bracing ply rigidity, need form decorative pattern along the Width of tire at the centre portion between the part that is positioned at tyre surface core (maximum bracing ply tensioning portion) and tyre surface with the maximum perimeter that contacts with ground with big rigidity.

(c) because the bracing ply rigidity in the tyre surface core is higher, so have in the land part of higher stiffness greatlyyer at the Width along tire at the circumferential strain that produces during the tyre rotation, and because the wearing and tearing that the releasing of strain causes are big in the change of trailing edge place.For fear of such phenomenon, needs are realized along the rigidity of tire width direction and are along the circumferential direction removed (escape) rubber: and

(d) circumferentially pattern groove becomes maximum for the contribution of the ability of opposing tyre slip or drainage performance in the fetus face office that along the circumferential direction has the maximum ground length of contact.Therefore, in order to realize resisting tyre slip and steering stability, can make the position of land part and circumferentially the position of pattern groove and be positioned at the circumferential pattern groove broad of axial inboard when making on being installed in self-propelled vehicle with respect to the equatorial plane of tire with respect to aforesaid clause (a) displacement; And draw and be used to guarantee the stability of self-propelled vehicle and the technological means of the abrasion resistance on dry pavement.

And, inventor's inspected be positioned at irregular wear that the tire shoulder of tire at the axial inboard place of self-propelled vehicle partly locates and the technological means that obtains being used to control irregular wear on being installed in self-propelled vehicle the time.

Made the present invention based on above-mentioned cognition.

That is to say general introduction of the present invention and be constructed as follows described.

(1) a kind of tire with asymmetric tread pattern, when with described mounting of tyre on self-propelled vehicle the time, described tire is designated with respect to the inboard of self-propelled vehicle and the outside towards, wherein, the tread surface zone that is arranged in axial inboard place with respect to the equatorial plane on being installed in self-propelled vehicle the time forms at least two circumferential pattern grooves that extend along the equatorial plane of tire, and be arranged in its axially at least one circumferential pattern groove of zone formation in the outside, the circumferential pattern groove of the most close tire equator face has average pattern groove width wide 20% or the more width than tire among the circumferential pattern groove in being arranged in axial medial region, the circumferential pattern groove of arranging near tyre surface end one side at axial medial region place has the width of the 90-110% that is equivalent to average pattern groove width, and has than average pattern groove width narrow 10% or more width at the circumferential pattern groove of the most close tire equator face in axial exterior lateral area place.

(2) according to the described tire of clause (1) with asymmetric tread pattern, wherein, a circumferential pattern groove is arranged in the axial exterior lateral area, and is disposed in the axial medial region and the circumferential pattern groove of the most close tire equator face has the width of the 120-145% that is equivalent to average pattern groove width.

(3) according to the described tire of clause (1) with asymmetric tread pattern, wherein, two circumferential pattern grooves are arranged in the axial exterior lateral area, and are disposed in the axial medial region and the circumferential pattern groove of the most close tire equator face has the width of the 130-160% that is equivalent to average pattern groove width.

(4) according to any described tire in the clause (1) to (3) with asymmetric tread pattern, wherein, to partly be arranged on the tire equator that is sandwiched between the circumferential pattern groove along the decorative pattern strip land that the tire equator face extends or near this equator, center on the tire width direction of described decorative pattern strip land part is arranged to from a side of the circumferential lengths prolongation of equatorial plane deflection ground contact area of tyre surface when making the tire inward camber of tire, and described decorative pattern strip land partly is provided with a plurality of thin pattern groove that extends along the direction that intersects with the tire equator face, described thin pattern groove has the part of extending along with respect to the direction of the inclined of tire protector, and the circumferential pattern groove that is positioned at the described side that the circumferential lengths of the ground contact area of tyre surface prolongs in two circumferential pattern grooves that clip decorative pattern strip land part has big width.

(5) according to the described tire with asymmetric tread pattern of clause (4), wherein, described thin pattern groove has 5-55 ° leaning angle with respect to the Width of tire.

(6) according to clause (4) or (5) described tire with asymmetric tread pattern, wherein, described thin pattern groove is at the surface of tyre surface opening.

(7) according to clause (4), (5) or (6) described tire with asymmetric tread pattern, wherein, the A/F of described thin pattern groove is not more than 2mm.

(8) according to clause (4) or (5) described tire with asymmetric tread pattern, wherein, described thin pattern groove is in the sealing of the surface of tyre surface.

(9) according to any described tire in the clause (1) to (3) with asymmetric tread pattern, wherein, to partly be arranged on the tire equator that is sandwiched between the circumferential pattern groove along the decorative pattern strip land that the tire equator face extends or near this equator, center on the tire width direction of described decorative pattern strip land part is arranged to from a side of the circumferential lengths prolongation of equatorial plane deflection ground contact area of tyre surface when making the tire inward camber of tire, and described decorative pattern strip land partly is provided with a plurality of oval-shaped recessed lacunas, described oval-shaped recessed lacuna has along the major axis of the direction that intersects with the tire equator face, and the circumferential pattern groove that is positioned at the described side that the circumferential lengths of the ground contact area of tyre surface prolongs in two circumferential pattern grooves that clip decorative pattern strip land part has big width.

(10) according to the described tire with asymmetric tread pattern of clause (9), wherein, the major axis of described lacuna has 5-45 ° leaning angle with respect to the Width of tire.

(11) according to any described tire in the clause (1) to (3) with asymmetric tread pattern, wherein, make the whole circumference upper edge of tyre surface tread width direction per unit width, can be formed among the land part that is defined between circumferential pattern groove and the tyre surface end be installed on the self-propelled vehicle time be in the cros-rib tread groove in the land part at axial inboard place total volume less than when being installed in self-propelled vehicle on the time at the land that is arranged in axial outside same total volume partly.

(12) according to the described tire of clause (11) with asymmetric tread pattern, wherein, make to be separated with circumferential pattern groove and a plurality of holes of 1/3 that extreme depth is equivalent to be not less than the circumferential pattern groove degree of depth are in the land part at axial inboard place when being formed on when being installed in self-propelled vehicle on, and the volume that makes along the Width of tyre surface from the line that passes described land center partly the recessed portion the zone of tyre surface end one side is greater than the volume of broad ways from the recessed portion of line towards the zone of a side opposite with the tyre surface end that pass described center.

(13) according to clause (11) or (12) described tire with asymmetric tread pattern, wherein, the land part that is positioned at axial inboard place in the time of on being installed in self-propelled vehicle is divided into the outside portion of Width and the inside portion of Width by the tiny circumferential pattern groove of width, and the width that makes the outside portion of Width is narrower than the inside portion of Width, and makes the width of Width outside portion be not more than 1/10 tread width.

(14) according to the described tire of clause (13) with asymmetric tread pattern, wherein, at least one center of curvature in the curve of the side profile of the outside portion of the Width in the section constitution tyre surface of the broad ways of tire is disposed in the outside of tire, and the center of curvature of curve of profile that constitutes the inside portion of Width is disposed in the inboard of tire.

(15), wherein, the width of the circumferential pattern groove of fine width is widened gradually towards tread surface one side from the pattern groove bottom according to any described tire in the clause (11) to (14) with asymmetric tread pattern.

(16) according to any described tire in the clause (11) to (15) with asymmetric tread pattern, wherein, under being equivalent to be not less than the effect of 70% load of maximum load-carrying capacity of tire, at least a portion that the land part that is arranged in the axial inboard place that is installed on the self-propelled vehicle has a zone in a plurality of holes contacts with ground.

(17) according to any described tire in the clause (11) to (16) with asymmetric tread pattern, wherein, make opening size become big towards direction away from the tire equator face in the land hole partly that is arranged in the axial inboard place that is installed on the self-propelled vehicle.

(18) according to any described tire in the clause (11) to (17) with asymmetric tread pattern, wherein, the distance between a plurality of holes in the land part that is being installed in the axial inboard place on the self-propelled vehicle is diminished towards the direction away from the equatorial plane of tire.

(19) according to any described tire in the clause (11) to (18) with asymmetric tread pattern, wherein, the degree of depth in the land hole partly that is arranged in the axial inboard place that is installed on the self-propelled vehicle is deepened towards the direction away from the tire equator face.

(20) according to any described tire in the clause (1) to (3) with asymmetric tread pattern, wherein, when with the transport of the diametral load on the end of mounting of tyre at the Width that is loaded into wheel rim towards wheel shaft greater than the wheel of the same transport of the diametral load on another end of the Width that is loaded into wheel rim on the time, make in the whole circumference upper edge of tyre surface tread width direction per unit width, can be formed among the land part that is defined between circumferential pattern groove and the tyre surface end when being installed in wheel on the time be in the total volume of the cros-rib tread groove in the land part of big transport one side less than the same total volume that is formed on the land cros-rib tread groove partly that is arranged in another tyre surface end side, the land part that wherein is positioned at big transport one side is divided into the outside portion of Width and the inside portion of Width by the circumferential pattern groove of fine width, forms a plurality of holes that are separated with circumferential pattern groove and cros-rib tread groove in the inside portion of Width.

(21), wherein, the width of the circumferential pattern groove of fine width is widened gradually towards tread surface one side from the pattern groove bottom according to the described tire of clause (20) with asymmetric tread pattern.

(22), wherein, make the opening size in each hole in a plurality of holes that in the inside portion of Width, form become big towards direction away from the tire equator face according to clause (20) or (21) described tire with asymmetric tread pattern.

(23) according to any described tire in the clause (20) to (22), wherein, the distance between a plurality of holes that form in the inside portion of Width is diminished towards the direction away from the tire equator face with asymmetric tread pattern.

(24) according to any described tire in the clause (20) to (23), wherein, the degree of depth in each hole in a plurality of holes that form in the inside portion of Width is deepened towards the direction away from the tire equator face with asymmetric tread pattern.

(25) according to any described tire in the clause (20) to (24) with asymmetric tread pattern, wherein, making at least a portion in the zone that has a plurality of holes in the inside portion of Width be equivalent to be not less than under the effect of 70% load of tire maximum load-carrying capacity contacts with ground.

(26) according to any described tire in the clause (20) to (25) with asymmetric tread pattern, wherein, to be arranged in the outside of tire at least one center of curvature in the curve of the side profile of the outside portion of the Width in the section constitution tyre surface of the broad ways of tire, and the center of curvature of curve of profile that will constitute the inside portion of Width is arranged in the inboard of tire.

(27) according to any described tire in the clause (1) to (3) with asymmetric tread pattern, wherein, be assembled on suitable (approved) wheel rim and filled air pressure at tire with regulation, and under the state that has been loaded the quality that is equivalent to maximum load-carrying capacity, make the effective contact area of ground of effective contact area of ground in the axial inboard or the axial outside greater than opposite side, and under the attitude of air pressure of filling, make in having a side of less effective contact area of ground with regulation, from perpendicular to the tangent line of the tyre surface outside face of tire equator face to the radial distance of each tyre surface ground engagement edge greater than the described radial distance the opposite side.

(28) according to the described tire of clause (27) with asymmetric tread pattern, wherein, effectively the pass between the size ratio (H-large/H-small) of the size ratio (S-large/S-small) of contact area of ground and radial distance is that (S-large/S-small)=A * (H-large/H-small), wherein A is 1.0-1.4.

(29) a kind of by at full time or the suspension that gives inward camber when needed will have the method for mounting of tyre on self-propelled vehicle of asymmetric tread pattern, described method comprises making as any described tire in the clause (1) to (28) and is under the following use form, promptly, when inward camber is put on described tire, be formed in the axial medial region with respect to the equatorial plane of tire in the time of on being installed in self-propelled vehicle and the location overlap of the circumferential lengths maximum of the circumferential pattern groove of the close equatorial plane and tyre surface ground contact area.

(30) a kind of method of measuring the vibration transmissibility of wheel, described method comprises that the wheel that will be equipped with having on the Width with respect to the tire of the cross sectional shape of equatorial plane symmetry is installed on the component of the wheel axle, radially to each tire shoulder of tire protector partly apply have different frequency vibration to measure transport, it is represented as, and the wheel shaft that produces in component of the wheel axle based on oscillating action power is imported and the ratio of oscillating action power, and determine the aviation value of the transport of each tire shoulder part under each frequency, to judge which aviation value of transport is bigger among determined aviation value.

(31) according to the method for the vibration transmissibility of the described measurement wheel of clause (30), wherein, the oscillation frequency that is applied is 300-1000Hz.

In the present invention, be that circumferencial direction along tyre surface extends and width is not less than the pattern groove of 2.5% tread width with in the text term " circumferentially pattern groove ".

In addition, employed term " cros-rib tread groove " is meant the pattern groove that has the leaning angle that is not less than 20 ° with respect to the circumferencial direction of tyre surface in the clause (11).

In addition, employed term " volume of recessed portion " is meant in each zone on the whole circumference of tire the circumferentially integrated value of all volumes in pattern groove, cros-rib tread groove and hole in the clause (11).

Similarly, employed term " tread width " is meant when tire is assemblied in and is suitable on the wheel rim and fills with the air pressure of regulation and ground contact width when being equivalent to be loaded under the quality of maximum load-carrying capacity in the clause (12).In this case, term " is suitable for wheel rim " and is meant at the fixed wheel rim of following standard min, and term " maximum load-carrying capacity " is meant the biggest quality that can apply load according to following standard to tire, and term " air pressure of regulation " is meant according to following standard according to air pressure that maximum load-carrying capacity limited.

By in the production of tire or use in the zone of described tire the actv. industrial standard to determine described standard.For example, there are " Year Book of The Tire and RimAssociation Inc. ", Europe that " Standard Manual of The European Tireand Rim Technical Organization " arranged in the U.S., and the Japan AutomobileTire Manufacturers Association Inc. of Japan " JATMA Year Book ".

In this manual, not distinguishing under the situation that the block land of decorative pattern strip land partial sum partly arranges, they are commonly referred to as the land part.

Because the tyre slip phenomenon all performs an analysis to carry out detailed research with numerical value in various tires, therefore the direction of having confirmed to improve the pattern groove of drainage performance is water (flow) direction (grain direction), and the normal direction of this grain direction and ground contact shape is basic identical.For this reason, during straight-line travelling, circumferentially pattern groove helps to improve near the drainage performance the tyre surface center, and the cros-rib tread groove helps to improve near the drainage performance along the ground contact jaw of tread width direction.In addition, notice the importance of front-wheel in the opposing tyre slip, confirmed to be hit, therefore be easy to apply inward camber in increase of glancing impact load and suspension.Find that in this case the width position of tire that the normal of ground contact shape is pointed to circumferencial direction is towards in the axial medial movement on self-propelled vehicle time the with mounting of tyre.Therefore, having found recently can be by locating to arrange that axially inboard circumferential pattern groove further improves drainage performance.

When observation has Different Plane degree ratio (flatness ratio) thereby has the various tire of different ground contact shapes, when maximum width in the comparison ground contact shape under actual operating conditions and maximum circumferential lengths, find, when the ground contact shape is illustrated by the heavy line on the tread contour with circumferential pattern groove 1a-1d among Fig. 1, when the maximum width of Fig. 1 (a) during greater than maximum circumferential lengths, compare with the reverse situation shown in Fig. 1 (b), circumferentially pattern groove has been discharged more substantial water.That is to say that in shown embodiment, four circumferential pattern groove 1a-1d of Fig. 1 (a) have realized 80% total displacement, and whole displacement of the circumferential pattern groove 1a-1d of Fig. 1 (b) are 60% of total displacement.

Therefore, under the situation of wherein maximum ground contact width shown in Fig. 1 (a) greater than the tire of maximum circumferential lengths, can improve drainage performance more greatly by the quantity that makes near the circumferential pattern groove the tyre surface core, thereby improve resistivity tyre slip.

On the other hand, circumferentially pattern groove has formed length and the identical pipeline of ground length of contact with the road surface contact, and formed pipeline is the sound pollution source as column resonance, and described sound pollution source generation is as the sound of whistle (whistle).About a circumferential pattern groove is arranged in tire on all places along the Width of tire, to the measured result of column resonant acoustic sound as shown in Figure 2, have been found that even that in the cross section of pattern groove when identical the magnitude of column resonance sound or sensitivity are along also different on the diverse location of tire width direction with width (pipeline section) and ground length of contact (duct length).Described sensitivity is lower at the axial inboard place of tyre surface, and becomes maximum in axial outside.From the tyre surface center towards the reduction of the sensitivity of axial inboard greater than from of the increase of tyre surface center towards the sensitivity in the axial outside.

As from foregoing, finding out, in order to improve resistivity, can suitably utilize circumferential pattern groove to tyre slip, and in order to reduce the noise from pattern groove, preferably from the pattern groove of tyre surface center at axial inboard layout greater number.

Typical case according to tread contour of the present invention based on above-mentioned cognition has been shown among Fig. 3.

That is to say, this tread contour has at least two circumferential pattern grooves (promptly, during being installed on the self-propelled vehicle, two circumferential pattern groove 1a from the equatorial plane 0 of tire to axial area inside in the illustrated embodiment and 1b) and at least one circumferential pattern groove (that is the circumferential pattern groove 1c of in illustrated embodiment in the zone in the axial outside).

In this case, importantly, the circumferential pattern groove 1b that is provided with near the equatorial plane 0 of tire among circumferential pattern groove 1a in being arranged in axial area inside and the 1b has than average pattern groove width wide 20% or more width, this average pattern groove width is that the total pattern groove width (being arranged in the overall width of the circumferential pattern groove of tyre surface) by making tire obtains divided by the circumferential quantity of pattern groove, and the circumferential pattern groove 1a that arranges towards a side of tyre surface end in axial area inside has the width of the 90-110% that is equivalent to average pattern groove width, and the circumferential pattern groove 1c in axial exterior lateral area has than average pattern groove width narrow 10% or more width.

That is to say, since the water yield that stores along per unit ground contact width in the central area of tread width direction and with it adjacent areas compare big 20% or more, so the width of the circumferential pattern groove 1b by making the most close tire equator face is than average pattern groove width big 20% or more many and obviously improved drainage performance.And, when the pattern groove width widen that makes circumferential pattern groove 1b surpass average pattern groove width 100% the time, can worry because the crimp of the core of circumferential pattern groove 1b when contacting with ground is difficult to carry out draining, thus preferably the pattern groove width increase on be limited to 100% of average pattern groove width.

On the other hand, because the circumferential pattern groove 1c that is arranged in the axial outside is higher for the sensitivity of column resonance, institute is so that this pattern groove width than average pattern groove width narrow 10% or more, can improve the ability of controlling noise thus by the width of widening circumferential pattern groove 1b and 1a.And, when the width of circumferential pattern groove 1c during, can worry not show function, so lower limit is preferably 3mm as pattern groove less than 3mm.

Because it is lower for the sensitivity of column resonance to be located at the circumferential pattern groove 1a at a side place of tire shoulder of axial inboard in installation, even this pattern groove width widen or narrow down is also less to the influence of noise.In order further to improve glancing impact resistivity for tyre slip under the situation of inward camber, make this pattern groove width just more enough than average pattern groove width wide 10%.On the other hand, in order to improve when the straight-line travelling, preferably make this pattern groove width narrower by 10%, so that improve drainage performance with the pattern groove in the axial outside than average pattern groove width for the resistivity of tyre slip.In other words, when the width that makes the circumferential pattern groove that is positioned at axial outside when being installed on the self-propelled vehicle reduces approximately 10% the time from average pattern groove width, can improve the drainage performance of axial outside with reducing in the same manner to compare more than 10% situation.

When the maximum ground contact width and hour along the difference between the circumferential ground length of contact, perhaps when the ground contact shape is slightly long in the horizontal direction, for example, if the planeness ratio of tire is higher or load-bearing is bigger, then compare greater than the situation of the ground length of contact that makes progress in week with the maximum ground contact width, circumferentially the drainage efficiency of pattern groove diminishes.In other words, under the extremely long situation of ground contact shape along continuous straight runs, circumferentially the drainage efficiency of pattern groove becomes big.In addition, because the sensitivity for column resonance is bigger in outside axially, when the quantity of the circumferential pattern groove in axial exterior lateral area is one, resistivity and noise performance have been improved usually to tyre slip.In this case, the water yield that is stored under the contact width of per unit ground in the central area is compared big 20-45% with adjacent areas with it, therefore can further improve resistivity for tyre slip than the wide 20-45% of average pattern groove width by making at the width of the axial circumferential pattern groove 1b at inboard place.

In addition, when the maximum ground contact width and circumferentially between the length of contact of ground differ greatly or when the ground contact shape is longer in the horizontal direction, for example, if the planeness ratio of tire is lower or supporting power is less, then with the maximum ground contact width and circumferentially the less situation of the difference between the length of contact of ground compare, circumferentially the drainage efficiency of pattern groove becomes big.For this reason, when two circumferential pattern grooves are arranged in axial outside, can more effectively improve resistivity for tyre slip.In addition, the water yield that is stored under the contact width of per unit ground in the central area is compared big 25-55% with adjacent areas with it, therefore by making width at the axial circumferential pattern groove 1b at inboard place, can further improve resistivity for tyre slip than the big 25-55% of average pattern groove width.

Next, will have the method for tire actual installation on self-propelled vehicle of above-mentioned tread contour with describing in detail.

When applying in the process that is being installed on the self-propelled vehicle under the situation about using under the state of inward camber, perhaps apply under the situation that the state of inward camber uses down in the change etc. of change (such as the change of contained personnel and goods), braking or tractive force by load, the ground length of contact in the contact shape of ground is at the axial inboard equatorial plane place that locates greater than tire.In this case, be maximum position at the ground length of contact, circumferentially the drainage efficiency of pattern groove becomes maximum, and as previously described, this position is the position that the sensitivity of column resonance is begun to locate in the inboard step-down from the equatorial plane of tire.Therefore, preferably, provide such mounting position, that is, as shown in Figure 4, the circumferential pattern groove 1b and the position mL of above-mentioned width widen are overlapping, on the mL of this position, when inward camber being put on the described tire, it is maximum that the circumferential lengths of tyre surface ground contact area becomes.In this case, " overlapping " is meant that position mL is comprised in a kind of layout among the circumferential pattern groove 1b, and need not to make position mL to be present in the center of the Width of circumferential pattern groove 1b.

By the above-mentioned installation of tire, can realize improving for the resistivity of tyre slip simultaneously and reduce column resonance noise.

Afterwards, describe the tire of high rideability, described tire has been guaranteed stability and the abrasion resistance of self-propelled vehicle on dry pavement, and simultaneous altitude has kept the resistivity for the tyre slip on moist road surface.

In radial-ply tyre, in order to strengthen the performance of running at high speed, can be by doing the intensity that the bolt for fastening a door from outside tire increases tread portion effectively and is positioned at the belt layer part of tread portion inboard, but in order to be provided at the steering stability on the moist road surface with regard to described tire, need be at the drainage performance on the tread portion that strengthens width widen on the basis of flattening.In this case, in order to strengthen so-called resistivity for tyre slip, attempt to get following mode and increase drainage efficiency, promptly, reduce the ground contact ratio of tyre surface land part, the direction of the circulating water (streamline) during perhaps along draining is arranged the circumferential pattern groove of width widen in the core of the Width of tread portion, the inclination pattern groove that along inclined direction extends with respect to the equator of tire perhaps is set, so that match with inclination streamline in tire shoulder part.

On the other hand, adopt wherein not pattern groove etc. is arranged in the tread contour based on the decorative pattern strip in the tyre surface core, so that utilize high bracing ply tension force and high rigidity in core by so-called hoop effect (hoopeffect) as expected, thereby produce adhesive ability and steering stability is provided under the situation that is to run at high speed on the dry pavement etc.

Therefore, there is such situation, that is, may conflicts mutually with adhesive ability and the steering stability under the situation of running at high speed on dry pavement etc. at the drainage performance on the moist road surface.In addition, also there is such problem, promptly, as previously described, because the bracing ply rigidity of tyre surface core is higher, become excessive so be accompanied by the strain along the circumferencial direction of tyre surface core of rotating and coming, thereby be easy to cause the core preferential wear, that is, and the wearing and tearing of so-called center.

In this case, need a kind of tread contour that can really coordinate aforementioned various performances of design.Yet, can not obtain the result of the described performance of As soon as possible Promising Policy.

Therefore, in the present invention, realize for the resistivity of tyre slip and the means of steering stability and abrasion resistance that as being provided for highly of being proposed in the above-mentioned clause (4) to (10) described resistivity and steering stability and abrasion resistance for tyre slip is the relation of conflict in conventional art.

Describe these means below with reference to accompanying drawings in detail.

Fig. 5 is the tread contour that is used for passenger car tire according to of the present invention.The tyre surface of this embodiment comprises four circumferential pattern groove 1a-1d that extend along the equatorial plane 0 of tire, among these circumferential pattern groove 1a-1d and tyre surface end T, be limited with respectively the land part 2a that constitutes by block and 2b, be positioned at the land part 3a and the 3b at inboard place and the decorative pattern strip land part 4 on the equatorial plane 0 of tire along the Width of tire towards the both sides of tyre surface end T.

In addition, land part 3a and 3b have with respect to the equatorial plane 0 diagonally extending of tire and along the Width of tire the inclination pattern groove 5a and the 5b of opening toward the outer side.And decorative pattern strip land part 4 has the thin pattern groove 6 of the equatorial plane 0 of a plurality of extend through tires.

When the ground contact shape that illustrates by the heavy line among Fig. 5 when putting on inward camber on the tire, importantly, the Width center S along tire of decorative pattern strip land part 4 is arranged towards such side from the equatorial plane 0 of tire, promptly, in this side, when putting on inward camber on the tire, the girth that makes tyre surface ground contact area is to length lengthening (that is the side of position mL that, has the maximum ground length of contact of tyre surface).

That is to say, decorative pattern strip land part 4 can be arranged in the high-band bundle stiffness layer part that produces high bracing ply tension force and the increase contact area of ground by lengthening ground length of contact by the aforementioned hoop effect in tyre surface central part office, this can strengthen steering stability greatly.

In addition, thin pattern groove 6 need be arranged in the decorative pattern strip land part 4, so that on the decorative pattern strip land part 4 that wearing and tearing is not concentrated in be present in the tyre surface core by high-band bundle stiffness layer.That is to say, can reduce the circumferential strain that the rotation that is accompanied by tire produces, thereby when removing the strain that the front produced in the time, can suppress wearing and tearing by thin pattern groove 6.

On the other hand, the formation of thin pattern groove 6 brings along the reduction of the rigidity in the tire width direction decorative pattern strip land part 4, the reduction that therefore need be by being implemented in strain in the contact of ground and the reduction of lateral stiffness and the reduction of adhesive ability is suppressed to minimum level.That is to say, thin pattern groove 6 preferably has the part of extending along with respect to the direction of the radial skew of tire protector, thereby can remain on the lateral stiffness in the contact area of ground, disappearance along the circumferential direction of land part and the broad ways that is limited by thin pattern groove 6 interfered mutually simultaneously.

In this case, thin pattern groove 6 has along the feature of the part of extending with respect to the direction of the radial skew of tire protector and means that thin pattern groove 6 is not radially as one man extending with Width along tire.Specifically, the preferred practice is, thin pattern groove 6 as shown in Figure 6 is along shown in the block diagram of the depth direction of decorative pattern strip land part 4, thin pattern groove 6 is split up into for example three parts, each part is along the otch of the depth direction radial skew with respect to tire, and the direction of adjacent part is opposite each other.In this case, the angle [alpha] that is limited between the otch of each several part is preferably in 5-30 ° the scope.

Except having the thin pattern groove 6 with respect to the otch of the radial skew of tire protector as shown in Figure 6, otch also can extend along the direction of tilt radially with respect to tire in distortion, perhaps the otch that forms from the surface of tyre surface can extend along different directions halfway, perhaps the otch that the surface from tyre surface can be formed halfway broad ways be divided into a plurality of parts and can make bearing of trend difference among institute's divided portion.Briefly, each thin pattern groove is all discontinuous on the Width of tire is basic.

Owing to strain has along the circumferential direction been eliminated in the formation of the thin pattern groove 6 that extends along described direction, avoid simultaneously making pattern groove continuous along tire width direction, therefore, can suppress the distortion of thin pattern groove, so that by guaranteeing rigidity along the Width qualification of tire and the influencing each other of adjacent wall of control.

Like this, be difficult to realize before can finely having solved to the conflict performance between resistivity, steering stability and the abrasion resistance of tyre slip.

In addition, thin pattern groove 6 preferably tilts in 5-55 ° scope with respect to the Width of tire, so that make so-called decorative pattern noise keep less, this noise land part during tire running contacts and produces with ground, front end place.That is to say,, can worry that thin pattern groove periodically overlaps with the line of ground contact shape during the rotation of tire, thereby cause the big-pattern noise that occurs when angle during less than 5 °.And when angle surpasses 55 °, worry that the rigidity of the broad ways of decorative pattern strip land part 4 can reduce, thereby steering stability is had a negative impact.

In addition, from the worn-down viewpoint of control tyre surface core, thin pattern groove 6 is preferably in the surface opening of tyre surface.Specifically, when A/F is not more than 2mm, can produce the effect that along the circumferential direction reduces strain fully.

Similarly, from improving the viewpoint of steering stability, thin pattern groove 6 is preferably in the surface sealing of tyre surface.

And, as shown in Figure 7, can replace thin pattern groove 6 and obtain and thin pattern groove 6 identical functions and effect by forming oval recessed lacuna 7, the recessed lacuna 7 of described ellipse has major axis along the direction that the equatorial plane 0 with tire intersects.In this case, the center of the major axis of lacuna 7 is overlapped with the center along tire width direction of decorative pattern strip land part 4.

And, such a case has also been described, that is, the technology that suppresses irregular wear also is applied to aforesaid height and keeps for the resistivity of the tyre slip on moist road surface and reduce the tire of noise.

In general, can produce such situation usually, that is, become problem in the airtyred front-wheel with the axial wearing and tearing of an inboard corresponding part under the state on being installed in self-propelled vehicle.Except self-propelled vehicle big this fact of setting for inward camber itself, this promptly, increases the load of glancing impact front-wheel based on so big factor, thereby has increased the aligning (align) of the front-wheel under inward camber and the posterior cord.

Under the situation of inward camber, the ground length of contact of tire shoulder part at axial inboard place becomes longer than the ground length of contact in the outside, if thereby apply the small sideslip angle of toe-in or posterior cord in this state, then the sideslip of tire becomes big and excessively bears side force in the tire shoulder part at axial inboard place, this is a factor that causes irregular wear, this irregular wear promptly and is partly compared at the axial tire shoulder of outside, and is bigger in the wearing and tearing of the axial tire shoulder part at inboard place.

In addition, in vertical deflection (deflection) of axial inboard place tire shoulder part greater than in axial vertical deflection of outside tire shoulder part, thereby make width widen and make the power of the zone reception of width widen along braking direction, this also is a factor that causes irregular wear.

And, and partly compare at the axial tire shoulder of outside, big and radius of rotation diminishes in the deflection of the axial tire shoulder part at inboard place, and this is used to receive the power of braking direction.This power bears the core that becomes bigger and be easy to produce irregular wear in this zone near the zone of ground contact jaw.

Therefore, under the state that is installed on the self-propelled vehicle, chaufeur is difficult to observe and notice the irregular wear that produces in the tire shoulder part that is arranged in axial inboard place, if thereby inappropriate processing and the irregular wear of leaving exists, irregular wear can develop and finally can cause such as troubles such as tyre breaks.

Therefore, in the present invention, effectively suppress to be positioned at the technological means of the axial inboard tire shoulder of locating irregular wear partly after described in clause (11)-(19), having realized being used on being installed in self-propelled vehicle.

Describe this technological means below with reference to accompanying drawings in detail.And the accompanying drawing of Fig. 8 and Fig. 8 back mainly illustrates the structure of land part and does not specifically illustrate the width of circumferential pattern groove.Under feature of the present invention, can suitably change the pattern groove width.

That is to say that Fig. 8 is the expansion drawing by the tread contour shown in the front view of the tire under an attitude that is installed on the self-propelled vehicle.The inner structure of this tire is identical with the general-duty radial-ply tyre, therefore will omit the description to it here.In tyre surface TD, be furnished with at least two circumferential pattern grooves, have three circumferential pattern groove 1a, 1b and 1c along the circumferential direction to extend continuously in an illustrated embodiment.As for by circumferential pattern groove 1a, the land part 2a that 1c and tyre surface end T are limited, 2b, be positioned at the land part 2a that is installed in the axial inboard place on the self-propelled vehicle and be formed the decorative pattern strip, and being formed the land of the pattern block that is limited by cros-rib tread groove 8, partly arranges the land part 2b that is positioned at the axial outside that is installed on the self-propelled vehicle, (it can be formed among the land part 2a to make total volume at the cros-rib tread groove of the whole circumference upper edge of tyre surface tread width direction per unit width thus, be not formed with the cros-rib tread groove in an illustrated embodiment) therefore less than the total volume that is formed at the cros-rib tread groove 8 among the land part 2b at a side place of another tyre surface end, make in land part 2a rigidity along its circumferencial direction greater than the rigidity in land part 2b along its circumferencial direction.And cros-rib tread groove 9a and 9b are respectively formed at by these three two other lands that circumferential pattern groove limited and partly arrange among 3a, the 3b, but this embodiment shown in being not limited to.

And, in land part 2a, be formed with a plurality of holes 10 of separating, thereby make and to be recessed the volume of the volume of part to the zone the T side of tyre surface end greater than the recessed portion in the zone from line of centers Ci to a side opposite with tyre surface end T from the cross central line Ci of land part 2a with circumferential pattern groove 1a.

Therefore, make along the circumferential direction the rigidity of the rigidity along the circumferential direction of land part 2a greater than land part 2b, thereby make land part 2a in ground contact surface, stand compressive deformation, so that prolong the ground length of contact, and the cros-rib tread groove is shunk so that the radius of gyration is less, and will with the opposite power of self-propelled vehicle forward travel direction, be that braking force is applied on the tire shoulder part of the land part 2a with big radius of gyration, therefore can prevent irregular wear.

In this case, term " can be formed on the cros-rib tread groove among the land part 2a " and comprise such a case,, does not form the cros-rib tread groove among the as directed embodiment like that is.In this case, the total volume of cros-rib tread groove is zero naturally.

Although land part 2a does not have the cros-rib tread groove in an illustrated embodiment, but, also can in land part 2a, form the cros-rib tread groove that quantity is less than the cros-rib tread groove among the land part 2b comparing with land part 2b under the bigger situation of rigidity on the circumferencial direction.

In this case,, can reduce the discontinuous part of geometry along the circumferential direction, so that suppress the tire heel and the wearing and tearing of tire toe of conduct irregular wear along the circumferential direction by reducing the quantity of the cros-rib tread groove among the land part 2a.

In addition, inboard at the Width of land part 2a, 2b, making cros- rib tread groove 9a and 9b be respectively formed at two lands that limited by three circumferential pattern groove 1a, 1b and 1c partly arranges among 3a, the 3b, wherein the edge of these pattern grooves can help to increase braking force and tractive force, and can improve the drainage performance in the tyre surface central area.

On the other hand, hole 10 has reduced to be provided with the shear rigidity in the zone in described hole, so that should the zone less and suppressed the appearance of antagonistic force to the carrying of side force.In addition,, also can suppress appearance for the antagonistic force of braking force even spur this zone along braking direction, thus the appearance of control irregular wear.

And, make the extreme depth in hole 10 be not less than circumferential pattern groove 1a, 1b, 1c the degree of depth 1/3, even Tyte Wear increases thus, also can guarantee to suppress the effect that irregular wear occurs by hole arranged 10.And, if the circumferential degree of depth difference of pattern groove 1a, 1b, 1c, then according to the degree of depth of the degree of depth limiting hole 10 of adjacent circumferential pattern groove (1a in the embodiment shown) with it.On the other hand, the upper limit of the extreme depth in hole 10 is preferably than the outermost layer of the bracing ply degree of depth to radial outside 1mm, thereby guarantees the rubber thickness between bracing ply and pattern groove bottom.Incidentally, as for the circumferential degree of depth of pattern groove 1a, 1b and 1c, wish circumferential pattern groove 1a and 1b are deepened, so that improve during straight-line travelling resistivity for tyre slip, and circumferential pattern groove 1c is deepened, with improve turn during for the resistivity of tyre slip.

In addition, the volume of the recessed portion in making from the line of centers Ci of axial inboard land part 2a to the zone of tyre surface end T side is greater than the volume of the recessed portion the zone from line of centers Ci to a side opposite with tyre surface end T, can strengthen the effect of inhibition irregular wear thus in the zone of the tyre surface end side that is easy to cause irregular wear.

Preferably, be arranged in the land part 2a that is installed in the axial inboard place on the self-propelled vehicle and be divided into the outside 12 of broad ways of tyre surface and the inside 13 of broad ways by the circumferential pattern groove 11 of fine width, and the width w of outside 12 that makes broad ways is narrower and be not more than 1/10 of tread width W than the width w0 of the inside 13 of broad ways.

Therefore, make in the inside 13 of the outside 12 that is easy to most to produce near the broad ways the ground contact jaw of irregular wear to be separated with broad ways, can suppress thus wearing and tearing from the outside to in-house development.In addition, the width w of outside 12 that makes broad ways is littler and be not more than 1/10 of tread width W than the width w0 of the inside 13 of broad ways, thereby can reduce the volume of irregular wear, so that keep good surface appearance.

Preferably, as shown in Figure 9, be disposed in the outside of the tire of profile S 1 along at least one the center of curvature C 1 in the center of curvature of the curve of the side profile S1 of the outside 12 of the section constitution broad ways of tire width direction, and the center of curvature C2 of curve of profile S2 that constitutes the inside 13 of broad ways is disposed in the inboard of the tire of profile S2.

Therefore, the irregular wear amount at 12 places, outside that are easy to produce near the broad ways the ground contact jaw of irregular wear most further can be reduced, to keep good surface appearance.

In this case, preferably as shown in Figure 9, the width w10 of the circumferential pattern groove 11 of fine width is widened gradually towards the tread surface side from the pattern groove bottom.

Therefore, even creep in the tiny circumferential pattern groove 11 of width such as the foreign matters such as handstone on the road surface, this foreign matter also is easy to be separated with pattern groove, thereby can prevent owing to travel under the state of foreign matter and the irregular wear core occurs in the inside 13 in broad ways creeping into.

And, tread structure preferably: at least a portion that has a zone in a plurality of holes 10 in the inside 13 of the broad ways of the land part 2a that is arranged in axial inboard place is being equivalent to be not less than under the effect of 70% load of maximum load-carrying capacity of tire and is contacting with ground.

In this case, compare with front-wheel, even the lower and ground contact width of load narrows down in the trailing wheel of forward drive vehicle (FF automobile), the zone with a plurality of holes 10 is contacted with ground, thereby can guarantee to suppress to occur the effect of irregular wear and development thereof.

More preferably, because they and the equatorial plane of tire separate, therefore make the opening size R in hole 10 of inside 13 of the broad ways that is arranged in the land part 2a that locates axial inboard bigger.

Therefore, by forming above-mentioned a plurality of hole 10, make along with big side force or braking force load near the ground contact jaw, the effect that suppresses to occur irregular wear and development thereof is big more.In addition, when in the zone that as much as possible hole 10 is arranged in effective inhibition irregular wear and when not being arranged in the part except that this zone, in the part except that above-mentioned zone, can keep steering stability and tyre surface durability well.

Preferably, along with a plurality of holes 10 of the inside 13 of the broad ways of the land part 2a that is arranged in axial inboard place equatorial plane, make diminishing between a plurality of holes 10 in the inside 13 of the axial broad ways of the land part 2a at inboard place apart from Q away from tire.

Even in this case, also can near the contact jaw of ground, make the effect that suppresses irregular wear bigger, and can be by only in the zone that effectively suppresses irregular wear, arranging that a plurality of holes keep good steering stability and tyre surface durability.

In addition, because the equatorial plane of hole and tire is separated, so preferably make the degree of depth in hole 10 darker.Even in this case, also can near the contact jaw of ground, make the effect that suppresses irregular wear bigger, and can be by only in the zone that effectively suppresses irregular wear, arranging that a plurality of holes keep good steering stability and tyre surface durability.

Next, the wheel that contact is equipped with described tire is described according to a kind of situation of said procedure raising to the technology of quiet degree in the car that remains on the tire that high anti-tyre slip ability is arranged on the moist road surface and reduce noise.

As a factor of quiet degree in the car that hinders in the car, noticed the noise that directly generates from tire and propagated sound by the solid that vibration produced that transmits tire to interior of motor vehicles.Among them, solid is propagated sound and is divided into rolling noise and decorative pattern noise roughly, under the situation of described rolling noise, by making tire make that in the pressure input that comes from the ground-surface irregularity degree being passed to vehicle body as vibration and described vibration integrally by wheel shaft then becomes a kind of sound in the interior of motor vehicles, under the situation of described decorative pattern noise, make tire vibration under the geometric discontinuity of the tread contour in tire itself, and described vibration is passed to vehicle body by wheel shaft and then becomes a kind of sound in the interior of motor vehicles.

Among these noises, think that up to now increase owing to the elastic oscillation of tire makes solid propagate sound and increases.In order to reduce elastic oscillation, originally proposed multiple countermeasure on one's body at tire, but do not obtained satisfied result.

For this reason, the inventor propagates sound to solid and has carried out various researchs and obtained a kind of like this understanding, that is, the vibration performance of wheel is to increase the soniferous key factor of solid.In addition, understood that the transmission of vibration from the tire to the self-propelled vehicle is with from tire protector partly by double-type sidewall sections, double-type bead part, wheel rim and spoke to wheel shaft in sequence, and the vibration transmissibility difference of transmitting to wheel shaft from each tire shoulder part of tire protector, and its form be not owing to spoke with respect to the offset direction of wheel rim cause but cause by the size and dimension of wheel itself.

Therefore, in the present invention, as shown in clause (20)-(26), realize being used for by when considering the transfer of vibration feature of every kind of wheel, carrying out the technological means that the soniferous minimizing countermeasure of solid improves quiet degree in the car.

Describe this technological means below with reference to accompanying drawings in detail.

That is to say that Figure 10 is the expansion drawing of tread contour, show on being assemblied in wheel and the front view of the tire that under air pressure, expands when being installed on the self-propelled vehicle.The inner structure of tire is identical with the general-duty radial-ply tyre, and will omit the description to it here.

In tyre surface TR, be furnished with at least three circumferential pattern groove 1a that along the circumferential direction extend continuously, 1b and 1c, and make in the whole circumference upper edge of tyre surface tread width direction per unit width, can be formed on be positioned at a side when being installed on the wheel and the land part 2a about being limited by circumferential pattern groove 1a and 1c and tyre surface end T, 2b has the total volume of the total volume of the cros-rib tread groove (not forming the cros-rib tread groove in an illustrated embodiment) among the land part 2a of big transport less than the cros-rib tread groove 8 that is formed on the land part 2b that is arranged in another tyre surface end side.

In addition, in two land part 3a, 3b that circumferential pattern groove 1a, 1b and 1c by three limit, form bevelled pattern groove 9a, 9b respectively, but the embodiment shown in being not limited to.

And land part 2a is provided with along the circumferencial direction of tyre surface continuously and the circumferential pattern groove 11 of the fine width of extending linearly, wherein the circumferential pattern groove 11 by fine width along the Width of tyre surface with land part 2a separated into two parts.In this case, outside 12 along the circumferential pattern groove 11 of the fine width of tread width direction is formed the narrow pattern rib of width, and is provided with a plurality of holes 10 that separate with the circumferential circumferential pattern groove 11 of pattern groove 1a and fine width along the inside 13 of the circumferential pattern groove 11 of the fine width of tread width direction.And, can in the inside 13 of the broad ways of tyre surface, form tire sipe (sipe) 14 with the interval that equates along the circumferencial direction of tyre surface.

In this case, make the total volume of the total volume of the cros-rib tread groove in land part 2a less than the cros-rib tread groove 8 in land part 2b, can make conduct less thus, and can prevent the appearance of the decorative pattern noise of generation when the cros-rib tread groove contacts with ground at the cros-rib tread groove of the discontinuous parts along the circumferential direction at land part 2a place with big vibration transfer characteristic.

In this case, term " can be formed on the cros-rib tread groove among the land part 2a " and comprise such a case,, does not form the cros-rib tread groove among the as directed embodiment like that is.In this case, the total volume of cros-rib tread groove is zero naturally.

By on land part 2a, arranging circumferential pattern groove 11 and a plurality of hole 10 of fine width, reduced the compression stiffness of land part 2a, make thus from irregular road surface for the input reduction of tire, be delivered to the vibration of wheel shaft with inhibition, and therefore can reduce to be delivered to the rolling noise of interior of motor vehicles.In this case, the circumferential pattern groove 11 of fine width is different with the cros-rib tread groove with a plurality of holes 10, does not have to form the discontinuous part with respect to the circumferencial direction of tyre surface, thereby also can suppress the appearance of decorative pattern noise.

On the other hand,, can guarantee, therefore can guarantee moist drainage performance as tread contour single-piece pattern groove volume by in land part 2b, arranging cros-rib tread groove 8.

And, when except that a plurality of holes 10, also being formed with tire sipe 14 in the inside 13 in the broad ways of tyre surface, can further reducing the compression stiffness of inside 13 of the broad ways of tyre surface, thereby can further reduce rolling noise.

Preferably, as shown in Figure 9, the width w10 of the circumferential pattern groove 11 of fine width is widened gradually towards the tread surface side from the pattern groove bottom.

Therefore, even creep into such as foreign matters such as handstones in the circumferential pattern groove 11 of fine width, also can easily foreign matter be taken out from this pattern groove, thereby can prevent owing to travel under the state of foreign matter and occur the core of irregular wear in the inside 13 in the broad ways of tyre surface creeping into.

Be more preferably, as shown in Figure 10, make away from the opening size R in each hole 10 in the inside 13 of the broad ways that is formed on tyre surface of tire equator face 0 bigger, and make less away between a plurality of holes 10 of tire equator face 0, make away from the degree of depth in the hole 10 of tire equator face 0 darker apart from Q.

Therefore, the compression stiffness of inside 13 of the broad ways of the tyre surface that upwards is provided with a plurality of holes 10 in the footpath of tire is reduced towards the ground at a side place of the part with big transport of institute's installation wheel contact jaw.More effectively, can make to reduce for the input of tire to be delivered to the vibration of wheel shaft, and reduce to be delivered to the rolling noise of interior of motor vehicles with control from the ground-surface irregularity.In addition, the hole is arranged in as much as possible in the zone that effectively reduces rolling noise but not is disposed in the tread portion except that above-mentioned zone, thereby can keep steering stability and tyre surface durability in the described part well.

As shown in Figure 10 preferably, at least a portion zone that comprises a plurality of holes 10 in the inside 13 that is disposed in broad ways is contacted with ground, and this zone is in the horizontal inboard of the ground contact width W70 of tyre surface under 70% the load effect that is equivalent to be not less than the tire maximum load-carrying capacity.

According to this structure, even during the braking of for example forward drive vehicle (FF automobile), compare with front-wheel, load in the trailing wheel diminishes, and the ground contact width of tyre surface become with trailing wheel in the same little, at least a portion with the zone in the hole 10 in the inside 13 of the broad ways that is disposed in tyre surface also can contact with ground, thereby guarantees to reduce the effect of rolling noise.

Be more preferably, as shown in Figure 9, in the cross section of the broad ways of tire, at least one center of curvature C1 in the center of curvature of the curve of the side profile S1 of the outside 12 of formation broad ways is disposed in the outside of this profile S1, and the center of curvature C2 of the curve of the in-to-in profile S2 of formation broad ways is disposed in the place, inboard of profile S2.

Therefore, can be reduced in the amount of the irregular wear in the outside 12 of broad ways, so that keep outward appearance well.

Figure 11 is the view that schematically illustrates according to the method for the vibration transmissibility of measurement wheel of the present invention.Can be easily and specify in reliably and be installed in the land part that is positioned at a side place when wheel is gone up by carrying out a kind of like this measurement with big transport.

Be contained on the axletree member 18 that is provided with road battery (road cell) 17 being equipped with to have with respect to the wheel 16 of tire equator in the face of the tire 15 of the lateral cross section shape of title, and the vibration of different frequency is put on each tire shoulder part 19 of tire protector, on 20, when these vibratory forcees are input F1 and F2, measurement is input to the input F3 of component of the wheel axle, determine transport α 1 and α 2 under each frequency by remove F3 with F1 and F2 then, and ask the mean number of each transport α 1 and α 2, to determine transport α 1, the aviation value of α 2, thus judge whether any one aviation value in the transport is bigger.

Therefore, can help to be input to aspect the input in the component of the wheel axle 18 contribution by in the tire shoulder part 19,20 of accurate judgement tire protector under given frequency band any one and specify a side that has big vibration transmissibility in the wheel greatly, and can arrange effectively in tyre side and variously be used to suppress the soniferous various countermeasures of the solid of wheel.

Be more preferably, given frequency band is 300-1000Hz.

In this case, can specify a side that wheel is had big transport more accurately.

Preferably, above-mentioned tire is assemblied in be suitable on the wheel rim and be inflated under the air pressure of regulation and with the corresponding quality of maximum load-carrying capacity under under the state that loads, make be positioned at the axial inboard that is installed on the self-propelled vehicle or axially effective contact area of ground of outside greater than opposite side, and under the situation about being inflated under the air pressure that is to stipulate, consider control, make from having less effective contact area of ground one side greater than described radial distance at opposite side at radial distance perpendicular to the tangent line on the tyre surface outside face of tire equator face for the wheel lateral deviation power that in having the tire of non-symmetrical design, is easy to produce.In this case, more preferably, effectively the pass between the size ratio (H-large/H-small) of the size ratio (S-large/S-small) of contact area of ground and radial distance is that (S-large/S-small)=A * (H-large/H-Small), wherein A is 1.0-1.4.

That is to say, when self-propelled vehicle was turned, the rigidity of the land part by making the axial outside that is positioned at tyre surface in the tire that is present in the outside of turning round (wherein load becomes big and contact area of ground increases) strengthened lateral control force greater than carrying out energetically in the rigidity of the axial land part at inboard place.Therefore, as a kind of concrete structure, make usually at the negative ratio of axial outside less so that strengthen the rigidity of land part, make simultaneously at the negative ratio at axial inboard place bigger, to guarantee drainage performance.

Yet, have in employing under the situation of so-called asymmetric tread pattern of said structure, since at the contact area of ground of axial outside greater than at the axial contact area of ground at inboard place, even make self-propelled vehicle straight line forward travel, the cross shear obvious difference between the axial inboard and axial outside that in the ground contact surface of tire, comes from the ground contact surface of ground-surface tyre surface, and described difference is as producing a reason of wheel lateral deviation power under the situation that camber angle is provided to tire, therefore produced the side force of points in axial direction lateral direction in tire.

Because various researchs to described wheel lateral deviation power, obtained a kind of like this understanding, promptly, the cross shear that produces in the contact area of the ground of tyre surface becomes maximum in tyre surface tire shoulder part, and the distance of separating with the tire equator face along with the ground contact area of tyre surface becomes big, make described shearing force become bigger, and very responsive for separating distance.

Therefore, in a kind of like this asymmetric profile, promptly, wherein the effective contact area of ground in the axial inboard or axial outside is greater than the effective contact area of ground in axial outside, promptly, make from having less effective contact area of ground one side greater than opposite side to the radial distance of each ground contact jaw perpendicular to the outside face of the tyre surface of tire equator face, thereby help to offset and have the wheel lateral deviation power that big effectively contact area of ground one side produces being arranged in cross shear that tyre surface tire shoulder part with big radial distance one side produced, and improved the steering stability under the little deflection angle especially.

In this case, preferably, pass between the size ratio (H-large/H-small) of the size ratio (S-large/S-small) of effective contact area of ground and radial distance is (S-large/S-small)=A * (H-large/H-Small), wherein A is 1.0-1.4, so that offset wheel lateral deviation power more effectively.

When A less than 1.0 the time, be easy to produce in opposite direction wheel lateral deviation power, and when A greater than 1.4 the time, the effect of offset wheel lateral deviation power has diminished.

Specify the method that suppresses wheel lateral deviation power below with reference to accompanying drawings.

For example, when by make in the ground contact surface at tyre surface axial inboard and axially the negative ratio of outside differ from one another and in Figure 12 (a) during the ground contact surface of schematically illustrated tyre surface, tire is assemblied in be suitable on the wheel rim and fill with the air pressure of regulation and the state that is being equivalent to be loaded under the quality of maximum load-carrying capacity under, when making at effective contact area of ground S by the axial outside shown in the oblique line among the figure _OutGreater than effective contact area of ground S at axial inboard place _InThe time, wheel lateral deviation power for the direction that suppresses to occur the points in axial direction outside, preferably as schematically showing by the cross section on the Width of the tire under the gas filed state under the air pressure that is in regulation among Figure 12 (b), described tire can for example constitute as described below, promptly, select the shape of the inside face of sulfurizing mould etc., thereby make from perpendicular to the radial distance H of the tangent line L on the tyre surface outside face of tire equator face 0 to the ground engagement edge of tyre surface EI, EO _In, H _OutAt the big (H in the axial inboard place with less effective contact area of ground _In＞H _Out).

In this case, be more preferably, when bigger effective contact area of ground is S-large, less effective contact area of ground is S-small, at the radial distance with bigger effective contact area of ground one side is H (S-large side), and when the radial distance with less effective contact area of ground one side is H (S-small side), satisfy following relation:

S-large/S-small=A * (H _{(s-small side)}/ H _{(s-large side)}), wherein A is 1.0-1.4.

Description of drawings

Fig. 1 is the view of expression based on the difference of the drainage ability of ground contact shape;

Fig. 2 is that expression is along the Width of the tyre surface view to the distribution of the sensitivity of column resonant acoustic;

Fig. 3 is the view of expression according to tread contour of the present invention;

Fig. 4 is the view of explanation according to fitting of tire mode of the present invention;

Fig. 5 is the view of expression according to tread contour of the present invention;

Fig. 6 is the view of the structure of the thin pattern groove of expression;

Fig. 7 is the view of expression according to another kind of tread contour of the present invention;

Fig. 8 is the expansion drawing of tread contour, shows one embodiment of the present of invention by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Fig. 9 is the view in transverse section of expression according to the part of tread contour of the present invention;

Figure 10 is the expansion drawing of tread contour, by being installed on the wheel and the front view of the state when gas filed mounting of tyre is on self-propelled vehicle under the air pressure shows one embodiment of the present of invention;

Figure 11 is the view that schematically shows according to the method for the vibration transmissibility of measurement wheel of the present invention:

Figure 12 is the view of the structure of the expression tire that is used to suppress wheel lateral deviation power;

Figure 13 is the view of employed various tread contours in the expression example;

Figure 14 is the view of employed various tread contours in the expression example;

Figure 15 is the view of employed various tread contours in the expression example;

Figure 16 is the view that expression is used for the tread contour of comparison;

Figure 17 is the expansion drawing of tread contour, shows an alternative embodiment of the invention by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Figure 18 is the expansion drawing of tread contour, shows a comparative example of tire by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Figure 19 is the expansion drawing of tread contour, shows another comparative example of tire by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Figure 20 is the expansion drawing of tread contour, shows another comparative example of tire by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Figure 21 is the expansion drawing of tread contour, shows another comparative example of tire by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Figure 22 is the expansion drawing of tread contour, shows another comparative example of tire by the front view that is in the tire under the state that is installed on the self-propelled vehicle;

Figure 23 is the expansion drawing of tread contour, by when being installed on the wheel and the front view of the state when gas filed mounting of tyre is on self-propelled vehicle under the air pressure shows a comparative example of tire;

Figure 24 is the expansion drawing of tread contour, by when being installed on the wheel and the front view of the state when gas filed mounting of tyre is on self-propelled vehicle under the air pressure shows another comparative example of tire;

Figure 25 is the view that schematically shows the cross sectional shape of wheel; And

Figure 26 is the expansion drawing of the tread contour in the comparative example 12.

The specific embodiment

(example 1)

Prepare the radial-ply tyre with the tread contour shown in Figure 13-15 according to following all size, wherein, the tire size among Figure 13 is 205/65 R15, and the tire size among Figure 14 is 205/55 R16, and the tire size among Figure 15 is 225/55 R16.And, the structure that (that is, is arranged in the land part and passes cros-rib tread groove and the inclination pattern groove that the tire equator face extends each other and at the land partial sum that is limited between circumferential pattern groove and the tyre surface end at circumferential pattern groove) except that circumferential pattern groove is with specification (specification) is identical substantially.In addition, be that camber angle is put on situation on the front wheels of motor-vehicles by the ground contact shape shown in the thick line that adds among every width of cloth figure.

Example 1-1

(A) conventional example 1-1: Figure 13 (a)

Have three circumferential pattern groove 1a-1c, wherein circumferential pattern groove 1b is arranged on the equatorial plane 0 of tire, and circumferential pattern groove 1a, 1c are arranged in such position, that is, described each position to be distributed in the both sides of circumferential pattern groove 1b with circumferential pattern groove 1b with being separated by the distance that equates.It is that the 8mm and the degree of depth are the square-section of 8mm that all these circumferential pattern grooves all have the pattern groove width.

(B) conventional example 1-2: Figure 13 (b)

When conventional example 1-2 is compared with conventional example 1-1, all circumferential pattern grooves all are arranged in towards the position of axial inboard skew 5mm.Identical among pattern groove width and the degree of depth and the conventional example 1-1.

(C) example 1-1 of the present invention: Figure 13 (c)

Example 1-1 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.0mm, circumferentially pattern groove 1b:9.6mm, and circumferential pattern groove 1c:6.4mm, and the pattern groove degree of depth is 8mm.

(D) example 1-2 of the present invention: Figure 13 (C)

Example 1-2 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.8mm, circumferentially pattern groove 1b:9.6mm, and circumferential pattern groove 1c:5.6mm, and the pattern groove degree of depth is 8mm.

(E) example 1-3 of the present invention: Figure 13 (C)

Example 1-3 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:7.2mm, circumferentially pattern groove 1b:9.6mm, and circumferential pattern groove 1c:7.2mm, and the pattern groove degree of depth is 8mm.

(F) comparative example 1-1: Figure 13 (c)

Comparative example 1-1 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.0mm, circumferentially pattern groove 1b:8.8mm, and circumferential pattern groove 1c:7.2mm, and the pattern groove degree of depth is 8mm.

(G) comparative example 1-2: Figure 13 (c)

Comparative example 1-2 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:9.2mm, circumferentially pattern groove 1b:9.6mm, and circumferential pattern groove 1c:5.2mm, and the pattern groove degree of depth is 8mm.

(H) comparative example 1-3: Figure 13 (c)

Comparative example 1-3 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:6.8mm, circumferentially pattern groove 1b:9.6mm, and circumferential pattern groove 1c:7.6mm, and the pattern groove degree of depth is 8mm.

(I) example 1-4 of the present invention: Figure 13 (C)

Example 1-4 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:7.2mm, circumferentially pattern groove 1b:11.6mm, and circumferential pattern groove 1c:5.2mm, and the pattern groove degree of depth is 8mm.

(J) comparative example 1-4: Figure 13 (c)

Comparative example 1-4 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-2 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:7.2mm, circumferentially pattern groove 1b:12.0mm, and circumferential pattern groove 1c:4.8mm, and the pattern groove degree of depth is 8mm.

In addition, the average pattern groove width in the tread contour of Figure 13 is 8mm.

After internal pressure is adjusted to 220kPa, each above-mentioned tire is assemblied on the wheel rim of 6J-15 and is installed on the car.Under the state of taking two people, be-0.4 ° with ground-surface camber angle in the front-wheel, the camber angle in the trailing wheel is-0.8 °.In puddle, carry out the accelerated test of the self-propelled vehicle that begins from the speed of 50km/h by test driver, cause the speed of tyre slip with evaluation with 6mm depth of water.Evaluation result is by the exponential representation of tyre slip speed, and wherein exponential quantity is big more, and the result is just good more.

In addition, be to carry out the braking test that begins from the speed of 100km/h on the moist road surface of 2mm in the depth of water, to estimate the tyre slip in the braking.Evaluation result is by exponential representation, and wherein exponential quantity is big more, and the result is just good more.In addition, measure chaufeur ear noise on every side when travelling on flat road surface with the speed of 60km/h, wherein exponential quantity is big more, and the result is just good more.

These evaluation results are shown in the table 1.

Table 1

?	The index of tyre slip speed	The index of the tyre slip in the braking	The index of noise
				Conventional example 1-1	100?	100?	100?

Conventional example 1-2	95?	102?	102?
				Example 1-1 of the present invention	105?	105?	105?
Example 1-2 of the present invention	102?	108?	108?
				Example 1-3 of the present invention	108?	103?	102?
Comparative example 1-1	97?	103?	103?
				Comparative example 1-2	99?	108?	102?
Comparative example 1-3	103?	98?	98?
				Example 1-4 of the present invention	102?	102?	103?
Comparative example 1-4	99?	99?	102?

As shown in table 1, undeniable, although the width of the circumferential pattern groove of central authorities is bigger by 10% than the width of average pattern groove, comparative example 1-1 is in deficiency aspect the resistivity of tyre slip.In comparative example 1-2, because the width at the axial inboard circumferential pattern groove of locating is 115% of an average pattern groove width, so compare with example 1-2 of the present invention, better at glancing impact for the resistivity of tyre slip, but owing to become too small at the axial width of the circumferential pattern groove of outside, so the index variation of tyre slip speed.In comparative example 1-3, width at the axial circumferential pattern groove of outside is littler by 5% than the width of average pattern groove, this wide pattern groove width in axial outside is being disadvantageous aspect the noise, narrower at the width of the axial inboard circumferential pattern groove of locating simultaneously, relatively poor at glancing impact for the resistivity of tyre slip.In comparative example 1-4, bigger by 50% at the width of the axial inboard circumferential pattern groove of locating, therefore too narrow at the pattern groove of axial outside than the width of average pattern groove, for the resistivity variation of tyre slip.

Example 1-2

(A) conventional example 1-3: Figure 14 (a)

Have four circumferential pattern groove 1a-1d, wherein, circumferential pattern groove 1b and 1c are arranged in the place, both sides of pattern rib 2, described pattern rib 2 is configured to its width center on the equatorial plane 0 of tire and have the width of 20mm, and circumferential pattern groove 1a and 1d are arranged in the outside of land part 3a, 3b, and described land part 3a, 3b are set at the outside of pattern groove and have the width of 20mm.It is that the 8mm and the degree of depth are the square-section of 8mm that all these circumferential pattern grooves all have the pattern groove width.

(B) conventional example 1-4: Figure 14 (b)

When conventional example 1-4 was compared with conventional example 1-3, all circumferential pattern grooves all were disposed in towards the position of axial inboard skew 6mm.When be under-0.5 ° the inward camber with mounting of tyre on self-propelled vehicle the time, circumferentially pattern groove 1b is present in the position of maximum ground length of contact.Identical among pattern groove width and the degree of depth and the conventional example 1-3.

(C) example 1-5 of the present invention: Figure 14 (c)

Example 1-5 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-4 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.0mm, circumferentially pattern groove 1b:9.6mm, circumferentially pattern groove 1c:7.2mm, and circumferential pattern groove 1d:7.2mm, and the pattern groove degree of depth is 8mm.

(D) example 1-6 of the present invention: Figure 14 (c)

Example 1-6 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-4 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.8mm, circumferentially pattern groove 1b:9.6mm, circumferentially pattern groove 1c:6.8mm, and circumferential pattern groove 1d:6.8mm, and the pattern groove degree of depth is 8mm.

(E) comparative example 1-5: Figure 14 (c)

Comparative example 1-5 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-4 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.8mm, circumferentially pattern groove 1b:8.8mm, circumferentially pattern groove 1c:7.2mm, and circumferential pattern groove 1d:7.2mm, and the pattern groove degree of depth is 8mm.

(F) comparative example 1-6: Figure 14 (c)

Comparative example 1-6 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-4 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:9.2mm, circumferentially pattern groove 1b:9.6mm, circumferentially pattern groove 1c:6.6mm, and circumferential pattern groove 1d:6.6mm, and the pattern groove degree of depth is 8mm.

(G) comparative example 1-7: Figure 14 (c)

Comparative example 1-7 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-4 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:7.2mm, circumferentially pattern groove 1b:9.6mm, circumferentially pattern groove 1C:7.6mm, and circumferential pattern groove 1d:7.6mm, and the pattern groove degree of depth is 8mm.

And the average pattern groove degree of depth in the tread contour of Figure 14 is 8mm.

After internal pressure is adjusted to 220kPa, each above-mentioned tire is assemblied on the wheel rim of 6.5J-16 and is installed on the car.Under the state of taking two people, be-0.5 ° with ground-surface camber angle in the front-wheel, the camber angle in the trailing wheel is-0.8 °.Is to carry out the accelerated test of the self-propelled vehicle that begins from the speed of 50km/h in the 6mm puddle by test driver in the depth of water, causes the speed of tyre slip with evaluation.Evaluation result is by the exponential representation of tyre slip speed, and wherein exponential quantity is big more, and the result is just good more.

In addition, carry out the braking test that begins from the speed of 100km/h having on the moist road surface of the 2mm depth of water, to estimate the tyre slip in the braking.Evaluation result is by exponential representation, and wherein exponential quantity is big more, and the result is just good more.In addition, when travelling on flat road surface with the speed of 60km/h, measure the noise around the chaufeur ear, wherein exponential quantity is big more, and the result is just good more.

These evaluation results are shown in the table 2.

Table 2

?	The index of tyre slip speed	The index of glancing impact tyre slip	The index of noise
				Conventional example 1-3	100?	100?	100?
Conventional example 1-4	102?	102?	102?
				Example 1-5 of the present invention	108?	106?	106?
Example 1-6 of the present invention	110?	108?	108?
				Comparative example 1-5	101?	103?	107?
Comparative example 1-6	100?	109?	102?
				Comparative example 1-7	103?	98?	97?

As shown in table 2, although the width of the circumferential pattern groove of central authorities is bigger by 10% than the width of average pattern groove, 1-4 compares with comparative example, and comparative example 1-5 is in deficiency aspect the resistivity of tyre slip.In comparative example 1-6, because the width at the axial inboard circumferential pattern groove of locating is 115% of an average pattern groove width, so compare with example 1-6 of the present invention, good at glancing impact for the resistivity of tyre slip, but owing to become too little at the axial width of the circumferential pattern groove of outside, so the index of tyre slip speed reduces.In comparative example 1-7, width at the axial circumferential pattern groove of outside is littler by 5% than the width of average pattern groove, this wide pattern groove width in axial outside is being disadvantageous aspect the noise, narrower at the width of the axial inboard circumferential pattern groove of locating simultaneously, relatively poor at glancing impact for the resistivity of tyre slip.

Example 1-3

(A) conventional example 1-5: Figure 15 (a)

Have four circumferential pattern groove 1a-1d, wherein circumferential pattern groove 1b and 1c are arranged in the both sides of pattern rib 2, described pattern rib 2 is configured to the width that its width is centered close on the equatorial plane 0 of tire and has 20mm, circumferential pattern groove 1a and 1d are arranged in the outside of land part 3a, 3b, and described land part 3a, 3b are set at the outside of pattern groove and have the width of 20mm.It is that the 8mm and the degree of depth are the square-section of 8mm that all these circumferential pattern grooves all have the pattern groove width.

(B) conventional example 1-6: Figure 15 (b)

When conventional example 1-6 was compared with conventional example 1-5, all circumferential pattern grooves all were disposed in towards the position of axial inboard skew 6mm.When be under-0.5 ° the inward camber with mounting of tyre on self-propelled vehicle the time, circumferentially pattern groove 1b is present in the position of maximum ground length of contact.Identical among pattern groove width and the degree of depth and the conventional example 1-5.

(C) example 1-7 of the present invention: Figure 15 (C)

Example 1-7 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-6 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.0mm, circumferentially pattern groove 1b:10.4mm, circumferentially pattern groove 1c:6.8mm, and circumferential pattern groove 1d:6.8mm, and the pattern groove degree of depth is 8mm.

(D) example 1-8 of the present invention: Figure 15 (C)

Example 1-8 of the present invention has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-6 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.0mm, circumferentially pattern groove 1b:12.4mm, circumferentially pattern groove 1c:5.8mm, and circumferential pattern groove 1d:5.8mm, and the pattern groove degree of depth is 8mm.

(E) comparative example 1-8: Figure 15 (c)

Comparative example 1-8 has the square-section, identical among the center of each circumferential pattern groove and the conventional example 1-6 wherein, but from axial inboard, the pattern groove width is, circumferential pattern groove 1a:8.8mm, circumferentially pattern groove 1b:13.2m, circumferentially pattern groove 1c:5.4mm, and circumferential pattern groove 1d:5.4mm, and the pattern groove degree of depth is 8mm.

In addition, the average pattern groove width in the tread contour of Figure 15 is 8mm.

After internal pressure is adjusted to 210kPa, each above-mentioned tire is assemblied on the wheel rim of 7.5J-16 and is installed on the car.Under the state of taking two people, be-0.3 ° with ground-surface camber angle in the front-wheel, the camber angle in the trailing wheel is-0.5 °.Is to carry out the accelerated test of the self-propelled vehicle that begins from the speed of 50km/h in the water altar of 6mm by test driver in the depth of water, causes the speed of tyre slip with evaluation.Evaluation result is by the exponential representation of tyre slip speed, and wherein exponential quantity is big more, and the result is just good more.

In addition, on the moist road surface of depth of water 2mm, carry out the braking test that begins from the speed of 100km/h, to estimate the tyre slip of glancing impact.Evaluation result is by exponential representation, and wherein exponential quantity is big more, and the result is just good more.In addition, when travelling on flat road surface with the speed of 60km/h, measure the noise around the chaufeur ear, wherein exponential quantity is big more, and the result is just good more.

These evaluation results are shown in the table 3.

Table 3

?	The index of tyre slip speed	The index of glancing impact tyre slip	The index of noise
				Conventional example 1-5	100?	100?	100?
Conventional example 1-6	100?	102?	102?
				Example 1-7 of the present invention	108?	106?	106?
Example 1-8 of the present invention	102?	103?	107?
				Comparative example 1-8	98?	99?	108?

As shown in table 3, although the width of the circumferential pattern groove of central authorities is bigger by 65% than the width of average pattern groove, but 1-6 compares with conventional example, and comparative example 1-8 is in deficiency aspect the resistivity of tyre slip, and becomes too little at the axial width of the circumferential pattern groove of outside.

(example 2)

Example 2-1

Preparation has the radial-ply tyre that is used for car of the tread contour shown in Fig. 5, and tire size is 205/65R15.In tread contour shown in Figure 5, the degree of depth of all four circumferential pattern grooves is 8mm, and circumferentially the width of pattern groove 1a and 1d is 8mm, and be 9.6mm at the width by applying negative camber angle and increase the circumferential pattern groove 1b that a side of ground length of contact (corresponding to axial inboard) locates, be 6.4mm at the width that reduces the circumferential pattern groove 1c that a side of ground length of contact (corresponding to the axial outside) locates.In addition, land part center S is 5mm with respect to the side-play amount of the equatorial plane 0 of tire, and is situation when applying 0.5 ° of negative camber angle by adding the ground contact shape shown in the thick line.

And, thin pattern groove 6 is tilted 15 ° with respect to the Width of tire.As shown in Figure 6, on the overall with of decorative pattern strip land part 4 with 18mm width with along tire radially be 10mm the degree of depth and with radially become with respect to tire ± thin pattern groove 6 is cut at 22.5 ° inclination angle.In addition, the A/F of thin pattern groove 6 is 0.4mm, and thin pattern groove 6 distance each other is 30mm.

Example 2-2

Preparation has the radial-ply tyre that is used for car of the tread contour shown in Fig. 7, and tire size is 205/65R15.Except that will having respectively with respect to tire width direction to tilt 15 ° the lacuna 7 of major axis is arranged in the decorative pattern strip land part 4 in order to replace thin pattern groove 6, identical with shown in Fig. 5 of the tread contour shown in Fig. 7.And lacuna 7 has the major axis of 13mm and the minor axis of 3mm, and lacuna 7 distance each other is 30mm.

Comparative example 2-1

Figure 16 is the tread contour that is used for comparison, and identical among its motif and the example 2-1 of the present invention, but it is different on some at this, that is, thin pattern groove 6 is not arranged in the decorative pattern strip land part 4 and the transverse center of decorative pattern strip land part 4 is positioned on the equatorial plane 0 of tire.And circumferentially the degree of depth of pattern groove is 8mm, and circumferentially the width of pattern groove 1a and 1d is 8mm, and circumferentially the width of pattern groove 1b and 1c is 7mm.

Each above-mentioned tire is assemblied on the standard rim and with its internal pressure is adjusted to 220kPa, afterwards, according to test with the feeling evaluation during straight-line travelling on the circuit route for the resistivity and the steering stability of tyre slip, and by made motor-driven vehicle going 20000km come abrasion loss with regard to center wear evaluation tyre surface core.Evaluation result by according to comparative example 2-1 be 100 index shown in the table 4, wherein exponential quantity is big more, the result is just good more.

Table 4

?	Steering stability	Resistivity to tyre slip	The center wearing and tearing
				Example 2-1 of the present invention	105?	108?	102?
Example 2-2 of the present invention	102?	108?	101?
				Comparative example 2-1	100?	100?	100?

(example 3)

In order to estimate the performance of the inhibition irregular wear in air-inflation tyre according to an embodiment of the invention, two kinds of tires of the present invention and five kinds of comparative tires are provided, every kind of tire all has the tire size of 205/65R15.In these tires each all is assemblied on the wheel rim of 6J * 15 of appointment and under the air pressure of 220kPa, puts on the air, then with this mounting of tyre on the test machine motor-car and the 30000km that travels, measure afterwards in the axially wearing and tearing of the tread portion at inboard place, to estimate the performance that suppresses irregular wear.Its result is shown in the table 5.

In the tread contour of example 3-1 of the present invention, as shown in Figure 8, at least two circumferential pattern grooves that along the circumferential direction extend continuously are set in tyre surface TR, be provided with three so circumferential pattern groove 1a among the shown embodiment, 1b, 1c (width 1a:8.0m, 1b:9.6mm, 1c:6.4mm), as for by these circumferential pattern groove 1a, the land part 2a that 1c and tyre surface end T are limited, 2b, the land part 2a that is positioned at axial inboard place is formed the decorative pattern strip, and the land part 2b that is positioned at axial outside is provided with cros-rib tread groove 8 and partly arranges to form block land, and make the total volume of the cros-rib tread groove among two land parts less in land part 2a, so that the rigidity of the land part along the circumferential direction among the land part 2a is greater than the rigidity in land part 2b.In addition, cros-rib tread groove 9a and 9b are arranged in respectively in two other land part 3a, the 3b defined in these three circumferential pattern grooves.In addition, land part 2a is provided with a plurality of holes 10 of separating with circumferential pattern groove 1a, makes the volume of the volume of the recessed portion in the zone from the line of centers Ci of land part 2a to tyre surface end T one side greater than the recessed portion in the zone from line of centers Ci to a side opposite with tyre surface end T thus.In addition, the land part 2a that is positioned at axial inboard place in the time of on being installed in self-propelled vehicle is divided into the outside 12 of broad ways and the inside 13 of broad ways by the circumferential pattern groove 11 of fine width, and make the width (10mm) of outside 12 of broad ways narrower, and be not more than 1/10 of tread width than the width (20mm) of the inside 13 of broad ways.

In the circumferential pattern groove 11 of fine width, the degree of depth is 5.0mm, and the width at place, pattern groove bottom is 1.5mm, and the width at tread surface place is 2.6mm.In addition, the width of the outside 12 of broad ways is 2mm, and the width of the inside 13 of broad ways is 18mm.

Be furnished with a plurality of holes 10 that the circumferential pattern groove 11 with circumferential pattern groove 1a and fine width separates at the land part 2a that is arranged in axial inboard place.These holes 10 are made of two rounds, wherein the diameter of the external holes of broad ways is that 2.5mm, the degree of depth are 6mm, and the distance between the center is 7.5mm, and the diameter of the internal holes of broad ways is that 1.5mm, the degree of depth are 6mm, and the distance between the center is 7.5mm.

The tread contour of example 3-2 of the present invention is as shown in Figure 17 based on example 3-1 of the present invention, and the circumferential decorative pattern trough that wherein replaces forming fine width is arranged a round, and the diameter in described hole is 2.5mm, and the degree of depth is that the distance between 6mm and the center is 7.5mm.

In the tread contour of comparative example 3-1, on the land part of a side of the tyre surface end that is arranged in axial outside, the cros-rib tread groove is not set as shown in Figure 18, and the cros-rib tread groove is arranged on the land part of a side of the tyre surface end that is arranged in axial inboard place.

In the tread contour of comparative example 3-2, as shown in Figure 19, make the tread contour shown in the example 3-1 of the present invention opposite between the axial outside and axial inboard.

As shown in Figure 20, the tread contour of comparative example 3-3 is based on example 3-1 of the present invention, wherein the width of the outside 12 of broad ways is 14mm, the width of the inside 13 of broad ways is 6mm, and in the inside 13 of broad ways, arrange a round, the diameter in hole is that 2.5mm, the degree of depth are 6mm, and the distance between the center is 7.5mm.

As shown in Figure 21, the tread contour of comparative example 3-4 is based on example 3-1 of the present invention, wherein do not arrange the circumferential pattern groove of fine width, and be that 3.0mm, the degree of depth are that distance between 6mm and the center is the round of 7.5mm from the inboard placement diameter of broad ways in the following sequence, diameter is that 2.0mm, the degree of depth are that distance between 6mm and the center is that the round of 7.5mm and diameter are that 1.0mm, the degree of depth are that distance between 6mm and the center is the round of 7.5mm.

As shown in Figure 22, the tread contour of comparative example 3-5 does not wherein form the hole based on example 3-1 of the present invention.

Come assess performance by measurement in the abrasion loss of the land part at axial inboard place and the difference between the land abrasion loss partly in axial outside, and described performance is 100 exponential representation by the result of a measurement based on comparative example 3-1, wherein exponential quantity is more little, and the result is just good more.

Table 5

?	Evaluation number to the resistivity of irregular wear
		Example 3-1 of the present invention	72?
Example 3-2 of the present invention	85?
		Comparative example 3-1	100?
Comparative example 3-2	120?
		Comparative example 3-3	95?
Comparative example 3-4	90?
		Comparative example 3-5	92?

In table 5, when example 3-1 of the present invention is compared with comparative example 3-1, be understandable that 3-1 compares with comparative example, example 3-1 of the present invention can prevent the irregular wear in the land part at axial inboard place greatly.

When comparative example 3-2 is compared with comparative example 3-1, be understandable that, if make the cros-rib tread slot part in the land part of axial outside less, and make this land part be divided into the inside of broad ways and the outside of broad ways by the circumferential pattern groove of fine width, and formation is porose in these parts, then can not bear the side force when turning round and the performance that suppresses irregular wear is on duty mutually.In this case, the outside that is positioned at the circumferential pattern groove outside of fine width is not used in the opposing side force, therefore causes the irregular wear in inside and makes degraded appearance.

When example 3-1 of the present invention is compared with comparative example 3-5, be understandable that, by hole arranged in the inside of land broad ways partly, can further suppress irregular wear.

When example 3-2 of the present invention is compared with example 3-1 of the present invention, be understandable that, to partly be divided into the outside of broad ways and the inside of broad ways at the land at axial inboard place by circumferential pattern groove, can further suppress irregular wear by fine width.

When comparative example 3-3 is compared with example 3-1 of the present invention, be understandable that when the exterior width of broad ways was too big, the effect that suppresses irregular wear was less.

When example 3-2 of the present invention is compared with comparative example 3-4, be understandable that, make the layout in the bigger hole of the diameter in hole at lateral outer side place can be effective to suppress irregular wear.

(example 4)

Example 4-1

In order to measure the purpose of the effect that in pneumatic tires according to the present invention, reduces interior noise, a kind of two kinds of tires (comparative example 4-1 and 4-2) that have the tire size of 205/65 R15 and the tire of tread contour shown in Figure 10 (example 4-1 of the present invention) and have tread contour shown in Figure 23 and 24 are provided.In these tires each all is being inflated and is being assembled in (transport: total amount (overall sound pressure level)+3dB) on the aluminium wheel with 14 * 6JJ size under the air pressure of 200kPa, wherein greater than in front side (the axially outside), and this wheel is installed on the family expenses FF car of 2000cc transport in rear side (axially inboard).With 60km/h enterprising every trade car test, during this period, measuring noise level under the 300-800Hz value range with the corresponding position of the left ear of chaufeur on irregular road surface.And the width of the circumferential pattern groove all tire of the left side along this order from figure is 8.0mm, 9.6mm and 7.4mm.

Its result is shown in the table 6.

As shown in Figure 23, in comparative example 4-1, with at least two circumferential pattern grooves, three the circumferential pattern grooves 52 that along the circumferential direction extend continuously that are in particular among the figure are arranged in the tyre surface 51, and with cros- rib tread groove 55,56 are arranged in land part 53 that is arranged in a lateral ends side and the land part 54 that is positioned at another lateral ends side, a described lateral ends side is positioned at the side with big vibration transfer characteristic of the wheel that will be mounted, cros- rib tread groove 55,56 are positioned among the land part that is limited by these circumferential pattern grooves 52, so that total volume is equal to each other, and with inclination pattern groove 59,60 are arranged in two land parts 57,58 that limited in the inboard by these three circumferential pattern groove 52 broad wayss.

In comparative example 4-2, as shown in Figure 24, the tire of example 4-1 of the present invention is installed on the wheel, make that the direction of decorative pattern is inside and outside opposite.

Table 6

?	Interior noise
		Example 4-1 of the present invention	Δ1.5dB?
Comparative example 4-1	Standard value
		Comparative example 4-2	+0.4dB?

In table 6, when example 4-1 of the present invention is compared with comparative example 4-1 and 4-2, be understandable that, by with the mounting of tyre of example 4-1 of the present invention on the wheel so that will have the cros-rib tread groove of little total volume and be provided with the circumferential pattern groove of fine width and the land in hole partly is arranged on the side with big transport of wheel, reduced the compression stiffness of described land part, thereby reduce pavement noise, and the geometric discontinuity of described land part is reduced, to reduce the tread contour noise, can reduce solid thus and propagate sound to reduce interior noise.

Comparative example 4-2 is such a case, promptly, with the mounting of tyre of example 4-1 of the present invention on wheel, make and to have the cros-rib tread groove of little total volume and to be provided with the circumferential pattern groove of fine width and the land in hole partly is arranged on the side with little transport of wheel, therefrom be understandable that, the quantity of the cros-rib tread groove in the land part on being arranged in the side with big transport of wheel becomes big and geometric discontinuity increases, therefore compare with comparative example 4-1, the tread contour noise has increased, and interior noise worsens more.

Example 4-2

For regulation in various wheels has a side of big transport, three kinds of wheel A, B, C are provided, described wheel has the cross sectional shape shown in Figure 25, and make dish with respect to the wheel rim biasing 45mm that is of a size of 14 * 6JJ, described wheel rim also is provided with a kind of like this tire, and described tire has the lateral cross section shape with respect to the equatorial plane symmetry of tire.Each wheel all is installed on the wheel shaft portion that is provided with force transducer, and vibration is put on two tire shoulder parts of tire protector by vibration exciter, to measure as the vibratory force of input and the power of measuring at wheel shaft portion place as output, and determine the function about the transmission of frequency rate at each place in front side and rear side, so that determine ratio (back/front) about each transmission of frequency rate, and the frequency field at 300-1000Hz calculates its aviation value, therefrom determines the side with big transport feature of wheel.Its result is shown in the table 7.When digital value was 1, the transport at front side and rear side place was identical, and when digital value surpassed 1, the transport at rear side place was bigger, when digital value less than 1 the time, the transport at place, front side is bigger.

Table 7

?	Transport (back/front)

Wheel A	1.0?
		Wheel B	0.8?
Wheel C	2.95?

According to the above content, the side with big transport of regulation wheel accurately, and can implement to be used to suppress the soniferous various countermeasures of solid effectively.

(example 5)

Be of a size of the tire of the present invention of 205/6 5R15 and the tire wheel assembly of comparative tire with respect to use, measure wheel lateral deviation power and definite steering stability and, thereby obtain the result shown in the table 8 for the resistivity of tyre slip.

Example 5-1 of the present invention has the shape of the ground contact surface of tyre surface shown in Figure 12 (a), three circumferential pattern grooves that wherein with the degree of depth are 8mm (begin the pattern groove width from the left side of figure and are followed successively by 8.0mm, 9.6mm and 7.4mm) be arranged in axial inboard and outside asymmetricly, and is 1.14 with respect to the effective contact area of ground Sout in the axial outside of tire equator face 0 with the axial inboard ratio of locating contact area of ground Sin, is 5.8mm from the radial distance of the tangent line L on the tyre surface outside face that is positioned at 80% the position that is equivalent to tread width W in axial outside, and is 6.2mm at axial inboard place.

Comparative example 5-1 has the shape of the ground contact surface of tyre surface shown in Figure 26, three circumferential pattern grooves that wherein with the degree of depth are 8mm are arranged symmetrically with respect to the equatorial plane of tire, and the effective contact area of ground in inboard and outside is equal to each other, from the radial distance of the tangent line L on the tyre surface outside face that is positioned at 80% the position that is equivalent to tread width W inboard and the outside is equal basically.

Comparative example 5-2 has the shape of the ground contact surface of tyre surface shown in Figure 12 (a), and wherein the radial distance of the tangent line L from the tyre surface outside face that is positioned at 80% the position that is equivalent to tread width W is inboard and the outside is equal basically.

According to the feeling evaluation steering stability when test is travelled on the circuit, and when being on the road surface of the depth of water 6mm straight-line travelling by the resistivity of feeling evaluation for tyre slip.And exponential quantity is big more, and the result is just good more.

The mean number of the measured value by asking 10 tires is determined wheel lateral deviation power.

Table 8

?	Steering stability	Resistivity to tyre slip	Wheel lateral deviation power
				Example 5-1 of the present invention	105?	108?	20?
Comparative example 5-1	100?	100?	18?
				Comparative example 5-2	108?	108?	86?

Can find out that as from table 8 example 5-1 of the present invention demonstrates high steering stability and to the resistivity of tyre slip, and wheel lateral deviation power can be controlled to be and identical level in the symmetrical rib tire of comparative example 5-1.

Industrial applicibility

According to the present invention, can provide and realize higher levels of resistivity for tyre slip and to the tire of the control of tire noise, and be conflict relationship in the prior art for the resistivity of tyre slip with to the control of tire noise.

Claims (26)

1. tire with asymmetric tread pattern, when with described mounting of tyre on self-propelled vehicle the time, described tire is designated with respect to the inboard of self-propelled vehicle and the outside towards, wherein, the tread surface zone that is arranged in axial inboard place with respect to the equatorial plane on being installed in self-propelled vehicle the time forms at least two circumferential pattern grooves that extend along the equatorial plane of tire, and form at least one circumferential pattern groove in the zone that is arranged in its axial outside, the circumferential pattern groove of the most close tire equator face has average pattern groove width wide 20% or the more width than tire among the circumferential pattern groove in being arranged in axial medial region, the circumferential pattern groove of arranging near tyre surface end one side at axial medial region place has the width of the 90-110% that is equivalent to average pattern groove width, and have than average pattern groove width narrow 10% or more width at the circumferential pattern groove of the most close tire equator face in axial exterior lateral area place, it is characterized in that, to partly be arranged on the tire equator that is sandwiched between the circumferential pattern groove along the decorative pattern strip land that the tire equator face extends or near this equator, the center on the tire width direction of described decorative pattern strip land part is arranged to from a side of the equatorial plane deflection of the tire circumferential lengths prolongation of the ground contact area of tyre surface when the tire inward camber, and described decorative pattern strip land partly is provided with a plurality of thin pattern groove that extends along the direction that intersects with the tire equator face, described thin pattern groove has the part of extending along with respect to the direction of the radial skew of tire protector, and the circumferential pattern groove of the described side that prolongs of the circumferential lengths that is positioned at the ground contact area of tyre surface in clipping two circumferential pattern grooves of decorative pattern strip land part has big width, described thin pattern groove is divided into 3 parts along the Width of tire, and each part is along the otch of the depth direction radial skew with respect to tire, make that the cut-out direction of adjacent part is opposite each other, and the angle between the notch portion is in 5-30 ° scope.

2. according to the described tire of claim 1 with asymmetric tread pattern, it is characterized in that, a circumferential pattern groove is arranged in the axial exterior lateral area, and is disposed in the axial medial region and the circumferential pattern groove of the most close tire equator face has the width of the 120-145% that is equivalent to average pattern groove width.

3. according to the described tire of claim 1 with asymmetric tread pattern, it is characterized in that, two circumferential pattern grooves are arranged in the axial exterior lateral area, and are disposed in the axial medial region and the circumferential pattern groove of the most close tire equator face has the width of the 130-160% that is equivalent to average pattern groove width.

4. according to the described tire of claim 1, it is characterized in that described thin pattern groove has 5-55 ° leaning angle with respect to the Width of tire with asymmetric tread pattern.

5. according to the described tire of claim 4, it is characterized in that described thin pattern groove is at the surface of tyre surface opening with asymmetric tread pattern.

6. according to the described tire of claim 5, it is characterized in that the A/F of described thin pattern groove is not more than 2mm with asymmetric tread pattern.

7. according to the described tire of claim 4, it is characterized in that described thin pattern groove is in the sealing of the surface of tyre surface with asymmetric tread pattern.

8. according to the described tire of claim 1 with asymmetric tread pattern, it is characterized in that, make the whole circumference upper edge of tyre surface tread width direction per unit width, can be formed among the land part that is defined between circumferential pattern groove and the tyre surface end be installed on the self-propelled vehicle time be in the cros-rib tread groove in the land part at axial inboard place total volume when being installed on the self-propelled vehicle at the same total volume of the land part that is arranged in axial outside.

9. according to the described tire of claim 8 with asymmetric tread pattern, it is characterized in that, the land part that is arranged in axial inboard place on being installed in self-propelled vehicle the time is formed with and is separated with circumferential pattern groove and extreme depth is not less than a plurality of holes of 1/3 of the circumferential pattern groove degree of depth, and the volume that makes the recessed portion of line to the zone of tyre surface end one side along the Width of tyre surface from the center of passing described land part is greater than the volume of broad ways from the recessed portion of line towards the zone of a side opposite with the tyre surface end that pass described center.

10. according to the described tire of claim 9 with asymmetric tread pattern, it is characterized in that, the land part that is positioned at axial inboard place in the time of on being installed in self-propelled vehicle is divided into Width outside portion and Width inside portion by the circumferential pattern groove of fine width, and make the width of Width outside portion narrower, and make the width of Width outside portion be not more than 1/10 tread width than the width of Width inside portion.

11. according to the described tire of claim 10 with asymmetric tread pattern, it is characterized in that, will be in the section constitution tyre surface of the broad ways of tire at least one center of curvature in the curve of the side profile of Width outside portion be arranged in the outside of tire, and the center of curvature of curve that will constitute the profile of Width inside portion is arranged in the inboard of tire.

12. according to the described tire of claim 10, it is characterized in that, the width of the circumferential pattern groove of fine width widened towards tread surface one side gradually from the pattern groove bottom with asymmetric tread pattern.

13. according to the described tire of claim 1 with asymmetric tread pattern, it is characterized in that, be equivalent to be not less than at least a portion that the land part that is arranged in the axial inboard place that is installed on the self-propelled vehicle has a zone in a plurality of holes under the effect of 70% load of maximum load-carrying capacity of tire and contact with ground.

14. according to the described tire of claim 13, it is characterized in that, make opening size become big towards direction away from the tire equator face in the land hole partly that is arranged in the axial inboard place that is installed on the self-propelled vehicle with asymmetric tread pattern.

15. according to the described tire of claim 13, it is characterized in that, the distance between a plurality of holes in the land part that is being installed in the axial inboard place on the self-propelled vehicle diminished towards the direction away from the tire equator face with asymmetric tread pattern.

16. according to the described tire of claim 13, it is characterized in that, the degree of depth in the land hole partly that is arranged in the axial inboard place that is installed on the self-propelled vehicle deepened towards the direction away from the tire equator face with asymmetric tread pattern.

17. according to the described tire of claim 1 with asymmetric tread pattern, it is characterized in that, when with the transport of the diametral load on the end of mounting of tyre at the Width that is loaded into wheel rim towards wheel shaft greater than the wheel of the same transport of the diametral load on another end of the Width that is loaded into wheel rim on the time, make in the whole circumference upper edge of tyre surface tread width direction per unit width, can be formed among the land part that is defined between circumferential pattern groove and the tyre surface end when being installed in wheel on the time be in the total volume of the cros-rib tread groove in the land part of big transport one side less than the same total volume that is formed on the land cros-rib tread groove partly that is arranged in another tyre surface end side, the land part that wherein is positioned at big transport one side is divided into Width outside portion and Width inside portion by the circumferential pattern groove of fine width, forms a plurality of holes that are separated with circumferential pattern groove and cros-rib tread groove in the Width inside portion.

18. according to the described tire of claim 17, it is characterized in that, the width of the circumferential pattern groove of fine width widened towards a side of tread surface gradually from the pattern groove bottom with asymmetric tread pattern.

19. according to the described tire of claim 17, it is characterized in that, make the opening size in each hole in a plurality of holes that in the Width inside portion, form become big towards direction away from the tire equator face with asymmetric tread pattern.

20. according to the described tire of claim 17, it is characterized in that, the distance between a plurality of holes that form in the Width inside portion diminished towards the direction away from the tire equator face with asymmetric tread pattern.

21. according to the described tire of claim 17, it is characterized in that, the degree of depth in each hole in a plurality of holes that form in the Width inside portion deepened towards the direction away from the tire equator face with asymmetric tread pattern.

22. according to the described tire of claim 17 with asymmetric tread pattern, it is characterized in that, make at least a portion in the zone that in the Width inside portion, has a plurality of holes be equivalent to be not less than under the effect of 70% load of tire maximum load-carrying capacity and contact with ground.

23. according to the described tire of claim 17 with asymmetric tread pattern, it is characterized in that, to be arranged in the outside of tire at least one center of curvature in the curve of the side profile of the Width outside portion in the section constitution tyre surface of the broad ways of tire, and the center of curvature of curve that will constitute the profile of Width inside portion is arranged in the inboard of tire.

24. according to the described tire of claim 1 with asymmetric tread pattern, it is characterized in that, be suitable on the wheel rim and filled with the air pressure of regulation and loaded under the state of the quality that is equivalent to maximum load-carrying capacity in that tire is assemblied in, make the effective contact area of ground of effective contact area of ground in the axial inboard or the axial outside greater than opposite side, and under the attitude of air pressure of filling with regulation, make in having a side of less effective contact area of ground, from perpendicular to the tangent line on the tyre surface outside face of tire equator face to the radial distance of each tyre surface ground engagement edge greater than the described radial distance opposite side, the air pressure of described regulation is meant based on industrial standard according to air pressure that maximum load-carrying capacity limited.

25. according to the described tire of claim 24 with asymmetric tread pattern, it is characterized in that, effectively the pass between the size ratio (H-large/H-small) of the size ratio (S-large/S-small) of contact area of ground and radial distance is that (S-large/S-small)=A * (H-large/H-small), wherein A is 1.0-1.4.

26. one kind will have the method for mounting of tyre on self-propelled vehicle of asymmetric tread pattern by the suspension that gives inward camber at full time or when needing, described method comprises making as any described tire in the claim 1 to 25 and is under the following use form, promptly, when inward camber being put on the described tire, be formed in the axial medial region with respect to the equatorial plane of tire in the time of on being installed in self-propelled vehicle and the location overlap of the circumferential lengths maximum of the circumferential pattern groove of the close equatorial plane and tyre surface ground contact area.

Images