CN102741063A

CN102741063A - Pneumatic tire

Info

Publication number: CN102741063A
Application number: CN2011800071711A
Authority: CN
Inventors: 渡边范好
Original assignee: Yokohama Rubber Co Ltd
Current assignee: Yokohama Rubber Co Ltd
Priority date: 2010-03-18
Filing date: 2011-03-17
Publication date: 2012-10-17
Anticipated expiration: 2031-03-17
Also published as: AU2011228471A1; AU2011228471B2; DE112011100473B4; CN102741063B; RU2504483C1; JP2011194987A; WO2011114740A1; DE112011100473T5; JP4577455B1

Abstract

A tread pattern of a pneumatic tire includes a plurality of inclined lug grooves, each having an opening end open into one of two circumferential grooves and a terminal end closed in a land portion sandwiched between the circumferential grooves. Each of the inclined lug grooves extends in a first direction of the tire circumferential direction from the opening end. The tread pattern further includes narrow grooves, each having a starting end at a midpoint of each of the inclined lug grooves. Each of the narrow grooves extends in a second direction opposite to the first direction, and is closed in the land portion. Each of the inclined lug grooves has a curve portion and a straight portion between the opening end and the terminal end. The straight portion extends parallel to the tire circumferential direction and includes the terminal end. The closed end of the narrow groove is positioned on a side of the second direction of the tire circumferential direction with respect to the terminal end of an inclined lug groove adjacent in the second direction to each of the inclined lug grooves.

Description

Air-inflation tyre

Technical field

The present invention relates to have the air-inflation tyre of tread contour.

Background technology

Usually, the airtyred tread contour of car has a plurality of at the main line that extends on the tire circumferential direction and a plurality of cros-rib tread groove that on tire width direction, extends at fetus face.In such air-inflation tyre,, be provided with a plurality of cros-rib tread grooves in order to improve the wet performance of drainage performance and moistening road-holding property, stability (road-holding property on wet road and stability) etc.Its result increases at the groove area ratio of the contact surface of fetus face, and the edge member in the fetus face also increases, and makes drainage performance and moistening road-holding property, stability improve.Yet on the other hand, the tyre surface rigidity of fetus face changes on tire circumferential direction significantly, and it can cause eccentric wear to decrease (partial wear) in many cases.In addition, under the situation that is provided with many cros-rib tread grooves, the tyre surface rigidity reduces, thereby makes dry road-holding property, stability (road-holding property on dry pavement and stability) reduce easily.

Under above-mentioned situation, known just like the air-inflation tyre shown in Fig. 7 (patent documentation 1) with tread contour.By this air-inflation tyre, make that the antiskid capability on snowy road surface and wet road improves.As shown in Figure 7, the central area 100A of tyre surface 100 is provided with 3 flanks 103.The first cros-rib tread groove 104 is provided with certain interval on tire circumferential direction T.The said first cros-rib tread groove 104 has an end that is communicated with main line 102 separately, and extends on each comfortable tire width direction.In each flank 103, the first cros-rib tread groove 104 is provided with at least one cutter groove 105 between separately, and it has an end that is communicated with the first cros-rib tread groove 104, and extends at tire circumferential direction T from certain position.Said certain position is with the flank width W ₁Or W ₂Be divided into the position that about equality is divided.Length L on the tire circumferential direction of cutter groove 105 ₁It is the first cros-rib tread groove 104 length L each other ₂40～60%.In each zone 100B of tire shoulder portion, 101B, definition has flank 107 between the main line 102 in the auxiliary tank that extends on the tire circumferential direction T 106 and the outside.

Patent documentation 1: TOHKEMY 2006-224770 communique

But according to above-described air-inflation tyre, even it can improve the antiskid capability on snowy road surface and wet road, the wet performance and the eccentric wear that also can't improve drainage performance and moistening road-holding property, stability etc. simultaneously decrease performance.

Summary of the invention

Therefore, the object of the present invention is to provide a kind of and the different tread contour of tread contour of look-ahead technique in the past, it can improve airtyred wet performance with flying colors and eccentric wear decreases performance.

According to a mode of the present invention, be provided with a kind of air-inflation tyre with tread contour.Said airtyred tire protector portion has:

Two circumferencial direction grooves extend on tire circumferential direction continuously;

A plurality of inclination cros-rib tread grooves; On tire circumferential direction, arrange; Each cros-rib tread groove that tilts has open end and end; Said open end is as at an end that is clipped in the land portion of extending continuously between the said circumferencial direction groove, on tire circumferential direction, an opening in said circumferencial direction groove, and said end is as the other end; In the portion of said land, seal, each cros-rib tread groove that tilts tilts with respect to tire width direction and extends upward from the first party of said open end at tire circumferential direction;

Stria or cutter groove; Second party opposite with said first direction extends upward; Each stria or cutter groove have starting end and the closed end in the portion of said land; And each stria or cutter groove are littler than each said inclination cros-rib tread groove in the locational groove width of said starting end, and said starting end is positioned at the mid point of each said inclination cros-rib tread groove.

Each said inclination cros-rib tread groove has curved portions or curve and the line part that comprises said end between said open end and said end, said line part and tire circumferential direction extend approximately abreast.

Closed end with each said each said stria of inclination cros-rib tread groove bonded assembly or cutter groove; With respect on said second direction in abutting connection with the end of the inclination cros-rib tread groove of each said inclination cros-rib tread groove, be arranged on the side on the said second direction of tire circumferential direction.

According to the air-inflation tyre of tread contour, can improve airtyred wet performance and eccentric wear simultaneously and decrease performance with aforesaid way.

Description of drawings

Fig. 1 is the figure that an embodiment of the employed tread contour of air-inflation tyre of the present invention is shown;

Fig. 2 A, 2B are the figure that the main portion of tread contour shown in Figure 1 is shown;

Fig. 3 A, 3B are the figure that the arrangement mode of inclination cros-rib tread groove in this embodiment, enclosed slot, land portion is shown;

Fig. 4 is the figure that the tread contour that uses as another embodiment of the present invention is shown;

Fig. 5 is the figure that an example of the tread contour that conduct and comparative example of the present invention use is shown;

Fig. 6 illustrates the conduct figure of a routine tread contour that uses of look-ahead technique in the past;

Fig. 7 illustrates the figure of an example of the tread contour of look-ahead technique in the past.

The basic symbol explanation

10: tread contour

12,12c, 12r, 12l: circumferencial direction groove

14,14r, 14l: land portion

16,16r, 16l: inclination cros-rib tread groove

16a: open end

16b: end

16c: curved portions

16d: line part

18,18r, 18l: cutter groove

18a: starting end

18b: closed end

20: shallow slot

22: tire shoulder portion cros-rib tread groove

24: tire shoulder portion stria

100: tyre surface

100A: central area

100B, 101B: tire shoulder portion zone

102: main line

103: flank

104: the first cros-rib tread grooves

105: the cutter groove

106: auxiliary tank

107: flank

The specific embodiment

Below, describe for air-inflation tyre of the present invention.The air-inflation tyre of embodiment of the present invention (below, be called tire) is used tire for car.Car uses tire to be tire, TRA (THE TIRE and RIM Association, INC.) tire of the chapters and sections PAS SENGER CAR TYRES defined of the tire of the 1st chapters and sections defined of yearbook and ETRTO STANDARD MANUAL according to the A chapter defined of JATMA yearbook in 2009.

As shown in Figure 1, tread contour 10 is formed at the tread of tyre portion of this embodiment.For easy understanding, Fig. 1 illustrates the figure that tread contour 10 launches in the plane.

Structure and rubber components as the tire of this embodiment can use known or new structure and rubber components, and structure and rubber components do not have special qualification.

In following explanation, tire circumferential direction refers to the moving direction of fetus face when tire is the center rotation with the tire S. A..Tire width direction refers to and the parallel direction of tire S. A. direction.In Fig. 1, tire circumferential direction is called as directions X (last direction (X1) among the figure and lower direction (X2)), and tire width direction is claimed Y direction (left among the figure to right-hand to).

As shown in Figure 1, tread contour 10 mainly has 3 circumferencial direction grooves 12 (12c, 12l, 12r), a plurality of cutter grooves 18 of a plurality of inclination cros-rib tread grooves 16 (16l, 16r) (18l, 18r), a plurality of tire shoulder portion cros-rib tread groove 22, a plurality of tire shoulder portion cutter groove 24.A plurality of tire shoulder portion cros-rib tread groove 22 and a plurality of tire shoulder portion cutter groove 24 are arranged at the tire shoulder portion of tire.This tire shoulder portion refers to the part beyond 3 circumferencial direction groove middle distance centre line C L circumferencial direction groove farthest is on tire width direction.

Circumferencial direction groove 12 comprises circumferencial direction groove 12c, circumferencial direction groove 12l, and circumferencial direction groove 12r extends on its each comfortable tire circumferential direction continuously.Be provided with treadwear sign at

circumferencial direction groove

12c, 12l, 12r bottom land separately according to JIS D4230 defined.The groove width of each circumferencial direction groove 12 for example is 5mm～15mm, and groove depth for example is 4mm～8mm.

In tread contour 10, circumferencial direction groove 12c is for being arranged on the tire centre line C L, and circumferencial direction groove 12l and circumferencial direction groove 12r are the both sides that are arranged at circumferencial direction groove 12c, oppose with the identical mode of distance apart from circumferencial direction groove 12c.Circumferencial direction groove 12l is arranged at half fetus face in the tire centre line C L left side of Fig. 1, and circumferencial direction groove 12r is arranged at half fetus face on the tire centre line C L right side of Fig. 1.

Though above-mentioned tread contour shown in Figure 1 10 has 3 circumferencial direction grooves, the quantity of circumferencial direction groove also can be 4 or 5.For example, it has under the situation of 4 circumferencial direction grooves, respectively is provided with two circumferencial direction grooves in the both sides of tire centre line C L, and inclination cros-rib tread groove (afterwards stating) can be arranged at the land portion between each two circumferencial direction grooves of both sides.Circumferencial direction groove 12l and circumferencial direction groove 12r not necessarily will be arranged at the position with respect to tire centre line C L symmetry, and also can be provided with asymmetric mode.

In tread contour 10, circumferencial direction groove 12c on the tire centre line C L and circumferencial direction groove 12l, circumferencial direction groove 12r are provided with two 14l of land portion, the 14r that on tire circumferential direction, extends continuously between the two.In other words, two 14l of land portion, 14r limit through two circumferencial direction grooves separately, and one of them is the circumferencial direction groove 12c on the tire line of centers in these two circumferencial direction grooves.Be provided with inclination cros-rib tread groove 16l, 16r at two 14l of land portion, 14r.

Fig. 2 A is the figure of explanation inclination cros-rib tread groove 16r, and Fig. 2 B is the figure of explanation inclination cros-rib tread groove 16l.

Inclination cros-rib tread groove 16l, 16r open end 16a separately be arranged at circumferencial direction groove 12l, 12c or

circumferencial direction groove

12c, 12r among both, apart from tire centre line C L circumferencial direction groove 12l far away or the side of 12r.

In the present invention, inclination cros-rib tread groove 16l, 16r open end separately can be arranged at circumferencial direction groove 12c in two circumferencial direction grooves, nearer apart from the tire centre line C L.But, considering that eccentric wear decreases performance, inclination cros-rib tread groove 16l, 16r open end 16a separately are preferably and are arranged at the circumferencial direction groove far away apart from the tire centre line C L.Though in this embodiment, be preferably the cros-rib tread groove not to circumferencial direction groove 12 openings nearer apart from the tire centre line C L, for example the cutter groove can be to this channel opening.

Shown in Fig. 2 A, 2B, inclination cros-rib tread groove 16l, 16r at one end have the open end 16a to circumferencial direction groove 12l or 12r opening separately, and have 14l of portion or the terminal 16b of 14r osed top in the land at the other end.In addition, inclination cros-rib tread groove 16l, 16r tilt with respect to tire width direction separately, and from open end 16a, extend upward in the first party of tire circumferential direction.At this, the said first direction of inclination cros-rib tread groove 16r is direction X ₂(lower direction).The said first direction of inclination cros-rib tread groove 16l is direction X ₁(going up direction).In such a manner, in tread contour 10, the inclination cros-rib tread groove 16l that extends from open end tilts along different directions with 16r.

Inclination cros-rib tread groove 16l, 16r have between open end 16a and terminal 16b crooked curved portions 16c separately, and the line part 16d that approximately extends abreast with tire circumferential direction.Line part 16d comprises terminal 16b.Except curved portions 16c, also can use the part curve.When line part 16d is about when parallel with tire circumferential direction, its expression line part 16d is 0～5 degree with respect to the elevation angle of tire circumferential direction.

The groove depth of inclination cros-rib tread groove 16l, 16r for example be circumferencial direction groove 12l, 12r groove depth 30%～80%, groove width for example is 1.5mm～5mm.The groove depth of inclination cros-rib tread groove 16l and 16r and groove width increase from terminal 16b towards open end 16a.Such groove depth and groove width are in above-mentioned number range.

14l of portion and 14r are provided with cutter groove 18l, the 18r that extends from inclination cros-rib tread groove 16l, 16r separately in the land.The groove width of cutter groove 18l, 18r is littler than inclination cros-rib tread groove.Cutter groove 18l, 18r have the starting end 18a of the mid point that is positioned at inclination cros-rib tread groove 16l or 16r separately, extend upward in the second party opposite with above-mentioned first direction, and have cutter groove 18l or 18r in the land 14l of portion or 14r osed top closed end 18b.With respect to tire circumferential direction, the elevation angle that connects the rectilinear direction of cutter groove 18l, 18r starting end 18a and closed end 18b separately is 10～80 degree.As stated, the first direction of inclination cros-rib tread groove 16l is different with the first direction of inclination cros-rib tread groove 16r, so the second direction that cutter groove 18l extends is also different with the second direction that cutter groove 18r extends.The second direction of cutter groove 18r is for being direction X ₁(going up direction), the second direction of cutter groove 18l is direction X ₂(lower direction).In such a manner, inclination cros-rib tread groove 16l, 16r and cutter groove 18l, the 18r of the 14l of portion, 14r are arranged to point-symmetric form in the land.

Though the width of cutter groove 18l, 18r is 0.1mm～2mm,, also can use the stria of groove width as 2mm～3mm except cutter groove 18l, the 18r.

Below, carry out detailed explanation for cutter groove 18l, 18r.Cutter groove 18l, 18r closed end 18b separately, with respect on second direction in abutting connection with the inclination cros-rib tread groove 16l ' of inclination cros-rib tread groove 16l or 16r or the terminal 16b ' (referring to Fig. 2 A, 2B) of 16r ', be arranged on the side on the second direction.Shown in Fig. 2 A, the closed end 18b of cutter groove 18r is positioned at direction X with respect to the terminal 16b ' of the inclination cros-rib tread groove 16r ' of adjacency ₁A side.Shown in Fig. 2 B, the closed end 18b of cutter groove 18l is positioned at direction X with respect to the terminal 16b ' of the inclination cros-rib tread groove 16l ' of adjacency ₂A side.In other words; When watching inclination cros-rib tread groove 16l ' and 16r ' and cutter groove 18l and 18r by tire width direction (horizontal direction of Fig. 2 A, 2B just), inclination cros-rib tread groove 16l ' and 16r ' and cutter groove 18l and 18r are overlapping on tire circumferential direction each other.Such set-up mode is to decrease performance in order to improve wet performance and eccentric wear simultaneously.About this point, will in after state.

In addition, the 14l of portion, 14r are provided with groove depth than cutter groove 18l, shallow slot 20 that 18r is little in the land.Each shallow slot 20 be preferably be arranged at land portion 14, in position and do not have the zone between the position on the tire width direction of circumferencial direction groove 12c (at the circumferencial direction groove on the tire line of centers) of the open end of inclination cros-rib tread groove 16 between the position and on the tire width direction at the starting end 18a of the cutter groove 18 that extends from inclination cros-rib tread groove on the tire circumferential direction of the terminal 16b of position and inclination cros-rib tread groove on the tire circumferential direction of the closed end 18b of cutter groove 18l or 18r.In such a manner, can improve initial wear.Initial wear has very big influence to middle stage and subsequent polishing machine.Therefore, can improve eccentric wear damage performance through improving initial wear.Shallow slot 20 is not to circumferencial

direction groove

12l, 12r, 12c, inclination cros-rib tread groove 16l, 16r, cutter groove 18l, 18r opening.

When being watched by the tire centre line C L, a plurality of tire shoulder portion cros-rib tread groove 22 is arranged at the circumferencial direction groove 12l of fetus face, the tire shoulder portion in the outside (away from the side of tire centre line C L) of 12r on tire width direction with a plurality of tire shoulder portion stria 24.The contact jaw opening of tire shoulder portion cros-rib tread groove 22 in tire shoulder portion, and be arranged at tire circumference.Said contact jaw is positioned on the contact wire E shown in Figure 1.The engagement edge position of contact wire E through tire shoulder portion limits, this engagement edge position be when mounting of tyre during in standard rim, when the engagement edge position of tire under the condition of normal tire internal gas pressure and normal load.

Said standard rim is that it " measures wheel rim (Measuring Rim) " according to JATMA prescribed by standard it " standard rim ", TRA prescribed by standard it " design wheel rim (Design Rim) " or ETRTO prescribed by standard.Said normal tire internal gas pressure is maxim or the ETRTO prescribed by standard it " inner gas pressure (inflation pressures) " according to JATMA defined it " maximum gas pressure ", TRA prescribed by standard it " the loading of tire limit under the various cold tire inner gas pressures (tire load limits at various cold inflation pressures) ".Said normal load is maxim or the ETRTO prescribed by standard it " lifting capacity " according to JATMA prescribed by standard it " maximal workload ", TRA prescribed by standard it " the loading of tire limit under the various cold tire inner gas pressures (tire load limits at various cold inflation pressures) ".But under the situation of car with tire, the normal tire internal gas pressure is that 180kPa, normal load are 80% of maximal workload.

Each tire shoulder portion stria 24 is arranged between the tire shoulder portion cros-rib tread groove 22 that is adjacent to each other on the tire circumferential direction.

Each tire shoulder portion cros-rib tread groove 22 is not to circumferencial direction groove 12l or 12r opening, and each tire shoulder portion stria 24 is to circumferencial direction groove 12l or 12r opening.In other words, in each circumferencial direction groove 12l, 12r,, also be provided with the tire shoulder portion open end of tire shoulder portion stria 24 except the open end 16a of inclination cros-rib tread groove 16l, 16r.Because tire shoulder portion cros-rib tread groove 22 not to circumferencial direction groove 12l or 12r opening, can reduce the decorative pattern noise by tread contour caused when keeping drainage performance.In addition, because the mole rigidity of tire shoulder portion increases, can improve road-holding property and stability on dry pavement.In addition, through being provided with tire shoulder portion stria 24, can improving eccentric wear and decrease performance.

Though the groove width of tire shoulder portion stria 24 is 2mm～3mm, except tire shoulder portion stria 24, also can use the tire shoulder portion cutter groove of groove width as 0.1mm～2mm.

In tread contour 10,, can increase the groove amount and improve drainage performance thus through the 14l of portion, 14r are provided with crooked inclination cros-rib tread groove 16l, 16r in the land.In addition, owing to be provided with open end 16a at circumferencial direction groove 12l and 12r, drainage performance is enhanced further.In addition, through being provided with 14l of portion or the terminal 16b of 14r osed top, can improve tire rigidity and road-holding property on dry pavement and stability in the land at inclination cros-rib tread groove 16l and 16r.Because inclination cros-rib tread groove 16l, 16r tilt with respect to tire width direction and tire circumferential direction, it suppresses the alerting ability of the action of the land 14l of portion, 14r with the 14l of land portion, when 14r is regarded as block.Consequently, the inhibition eccentric wear decreases and can suppress the decorative pattern noise that vibration caused by several kilo hertzs of block.

As stated, the closed end 18b of each cutter groove 18l, 18r, with respect on second direction in abutting connection with the inclination cros-rib tread groove 16l ' of inclination cros-rib tread groove 16l, 16r, the terminal 16b ' of 16r ', be positioned at the side on the second direction.Through the position of closed end 18b and terminal 16b ' is set in this wise, can improves wet performance and eccentric wear simultaneously and decrease performance.

Fig. 3 A is the figure of the main portion of explanation tread contour 10.Shallow slot 20 is not shown in Fig. 3 A.

Shown in Fig. 3 A, the zone of the land portion between inclination cros-rib tread groove is divided into region S on tire circumferential direction ₁, S ₂, S ₃Situation under, the position of inclination cros-rib tread groove 16 and the position of cutter groove 18 are overlapping on tire circumferential direction each other.Its result makes for region S ₂The tire rigidity that moves on tire width direction becomes in the ideal range, and reduces from region S ₁To region S ₃, the variation of the tire rigidity on tire width direction.

But, shown in Fig. 3 B, if the position of the position of inclination cros-rib tread groove 16 and cutter groove 18 is not overlapping on tire circumferential direction each other, region S then ₅The tire rigidity be high, and from region S ₄To region S ₆, the tire rigidity on tire width direction changes significantly.At this, eccentric wear takes place in the position that the tire rigidity changes significantly easily decrease.

On the contact surface of tire, fetus face in the central area wearing and tearing that have the tire centre line C L to pass fast.In tread contour 10; Through the open end 16a of inclination cros-rib tread groove 16l, 16r not being arranged at circumferencial direction groove 12c; And can be suppressed near the 14l of land portion the circumferencial direction groove 12c, the rigidity reduction of 14r part (the R1 zone among Fig. 3 A), and then lower eccentric wear damage (center wearing and tearing).

In addition; Line part 16d through will be parallel with tire circumferential direction is arranged at inclination cros-rib tread groove 16 with the mode near terminal 16b; And can reduce the member that inclination cros-rib tread groove 16 extends on tire width direction, and then side by side improve the straight line moving performance and the wet performance of tire.Even said straight line moving performance is to make traveling vehicle not have distortion angle that the stability that also can walk point-blank takes place under the situation of microvibration etc. at tire.From the viewpoint of drainage performance, because the groove depth of each inclination cros-rib tread groove 16l, 16r increases to open end 16a from terminal 16b, the displacement of inclination cros-rib tread groove 16l, 16r can the corresponding water yield that the 14l of portion, 14r flow into gradually from the land.In addition, terminal 16b is near the part (the R1 zone among Fig. 3 A) of circumferencial direction groove 12c among each inclination cros-rib tread groove 16l, the 16r.Because the groove depth of each inclination cros-rib tread groove 16l, 16r is little in this section, can strengthen in each 14l of land portion, 14r, near the mole rigidity on tire width direction the circumferencial direction groove 12c.

In addition, in each 14l of land portion, 14r, the mode that a plurality of shallow slots 20 do not overlap each other when being watched by tire width direction is set up.Through shallow slot 20 is provided with in such a manner; Can be in keeping each 14l of land portion, 14r in the high mole rigidity near the part (the R1 zone among Fig. 3 A) of circumferencial direction groove 12c; Change the rigidity of another part in each 14l of land portion, 14r glibly, and then suppress eccentric wear and decrease.

In such tread contour 10, the length L of the line part 16d of each tilt cros-rib tread groove 16l, 16r ₁(referring to Fig. 3 A) is preferably the cros-rib tread groove 16l that respectively tilts, the length L of 16r on tire circumferential direction ₂(referring to Fig. 3 A) 3～75%.If length L ₁To length L ₂Ratio be lower than 3%, then the raising of the straight line moving performance of tire reduces.If this ratio is higher than 75%, then the raising of drainage performance reduces.

The terminal 16b of each tilt cros-rib tread groove 16l, 16r and distance (width) W between the open end 16a ₁Be preferably the width W of each 14l of land portion, 14r ₂50～90%.If width W ₁To width W ₂Ratio be lower than 50%, groove quantity not sufficient then, and comprise that the wet performance of drainage performance reduces.If this ratio is higher than 90%, then reduce in the raising leeway of road-holding property on dry pavement and stability.

Distance (width) W between the open end 16a of the starting end 18a of each cutter groove 18l, 18r and respectively tilt cros-rib tread groove 16l, 16r on tire width direction ₃Be preferably the width W of each 14l of land portion, 14r ₂5～40%.If width W ₃To width W ₂Ratio be lower than 5%, the distance of the part that then clips between each circumferencial direction groove 12l, 12r and each cutter groove 18l, the 18r reduces, the mole rigidity of this part reduces and abrasion factor improves, and this part becomes inclined to one side worn-down center easily.If width W ₃To width W ₂Ratio be higher than 40%, the mole rigidity of the part that then clips between circumferencial direction groove 12c and each cutter groove 18l, the 18r reduces and abrasion factor improves, and this part becomes inclined to one side worn-down center easily.Width W ₃To width W ₂Ratio be preferably 15～30%.

Distance (width) W between the open end 16a of the closed end 18b of each cutter groove 18l, 18r and respectively tilt cros-rib tread groove 16l, 16r on tire width direction ₄Be preferably the width W of each 14l of land portion, 14r ₂20～60%.If width W ₄To width W ₂Ratio be lower than 20%, the distance of the part that then clips between each circumferencial direction groove 12l, 12r and each cutter groove 18l, the 18r reduces, the mole rigidity of this part reduces and abrasion factor improves, and this part becomes inclined to one side worn-down center easily.If width W ₄To width W ₂Ratio be higher than 60%, the mole rigidity of the part that then clips between circumferencial direction groove 12c and each cutter groove 18l, the 18r reduces and abrasion factor improves, and this part becomes inclined to one side worn-down center easily.Width W ₄To width W ₂Ratio be preferably 30～50%.

The degree of depth of each cutter groove 18l, 18r be preferably starting end 18a respectively tilt cros-rib tread groove 16l, 16r, that be positioned at each cutter groove 18l, 18r groove depth 50～100%.If the degree of depth of each cutter groove 18l, 18r is greater than the groove depth of each inclination cros-rib tread groove 16l, 16r; The mole rigidity of the part that then clips between each cutter groove 18l, 18r and each circumferencial direction groove 12l, the 12r reduces and the abrasion factor raising, and this part becomes inclined to one side worn-down center easily.On the other hand, if, then comprising the wet performance of drainage performance less than 50% of the groove depth of each inclination cros-rib tread groove 16l, 16r, the degree of depth of each cutter groove 18l, 18r reduces.

Distance between the closed end of one end of each shallow slot 20 and each cutter groove 18l, 18r on tire width direction is preferably and is less than or equal to 2mm.Distance between the end of the other end of each shallow slot 20 and respectively tilt cros-rib tread groove 16l, 16r on tire width direction is preferably and is less than or equal to 2mm.

The groove depth of each shallow slot 20 be preferably each circumferencial direction groove 12l, 12r groove depth 2～10%.Because shallow slot 20 is arranged at the part with high mole rigidity of the 14l of land portion, 14r, it improves eccentric wear and decreases performance.Because shallow slot 20 is shallow, it can disappear under the situation that wearing and tearing are proceeded and be inoperative.Yet shallow slot 20 can decrease the wearing and tearing initial stage inhibition land 14l of portion that very big influence is arranged, mole stiffness change 14r, on tire circumferential direction to eccentric wear, thereby suppresses eccentric wear and decrease.

The width of each shallow slot 20 is preferably 0.2～2mm.If this width is less than 0.2mm, then eccentric wear decreases and is not substantially improved.If this width is greater than 2mm, then the mole rigidity of each several part changes on tire circumferential direction significantly, and the eccentric wear damage takes place easily.The width of each shallow slot 20 is preferably 0.5～1mm.

The tire shoulder portion open end of tire shoulder portion cutter groove 24 is preferably on tire circumferential direction distance with regulation from the tire circumferential direction position of the open end 16a of inclination cros-rib tread groove 16l or 16r, and the distance of this regulation is more than 10%, below 90% of length between the open end 16a of the inclination cros-rib tread groove 16l that is adjacent to each other or 16r.If this distance less than the length between the open end 16a 10% or greater than 90% of the length between the open end 16a, then the land portion of tire shoulder portion beyond each circumferencial direction groove 16l, 16r can't the mole stiffness change according to the 14l of land portion, 14r change on tire circumferential direction in the mole rigidity on the tire width direction.Therefore, the acoustic pressure of decorative pattern noise can increase.

Tire shoulder portion cros-rib tread groove 22 is not to circumferencial direction groove 12l, 12r opening.Like this, can reduce decorative pattern noise and when guaranteeing drainage performance, improve road-holding property and the stability on dry pavement.

In tread contour 10, through circumferencial direction groove 12c is arranged on the tire line of centers with the longest length of contact, can effectively draining on the wet road of one deck water arranged, thereby improve wet performance.

Tread contour 10 comprises 3 circumferencial direction grooves, and it can improve the drainage performance on wet road through these 3 circumferencial direction grooves.

(instance, comparative example and example in the past)

In order to study the effect of tread contour 10, with the experiment method manufacture of tires.The tire made from experiment method is of a size of 196/65R15 91H.Be made as in decorative pattern 1～31, comparative example 1～2 and the example in the past of instance at each, utilize tread contour with 3 circumferencial direction grooves.The mounting of tyre made from experiment method is to the wheel rim of 15-6JJ; And be that to be mounted to free air capacity under the condition of 210kPa be 1.8 liters car at the tire internal gas pressure, and under the situation that 2 Che Nei passengers are arranged to wet performance, the eccentric wear that comprises drainage performance and moistening road-holding property, stability decrease performance, road-holding property and stability (dry road-holding property, stability) and decorative pattern noise (subjective assessment) on dry pavement tested.

, wear state is decreased performance as eccentric wear estimate down after 10,000 kilometers of the walkings at the walking mode (on flat road surface, average speed of travel 80km/h) of regulation with visual inspection.To wet performance, dry road-holding property, stability and decorative pattern noise, carried out sensory evaluation by chaufeur.To the evaluation result of wet performance and dry road-holding property, stability, numerical value is high more, shows that wet performance and dry road-holding property, stability run off look.To the evaluation result of decorative pattern noise, numerical value is high more, and it is many more to show that the decorative pattern noise reduces.To the evaluation of each performance, represented the degree of the tolerance interval of this performance in 5 minutes, what tire was required was evaluated as more than 5 minutes.

(decorative pattern)

Performance to each decorative pattern of comprising tread contour shown in Figure 1 10 is estimated.Decorative pattern 1 is the decorative pattern of embodiment shown in Figure 1.Decorative pattern 2 is the decorative pattern of embodiment shown in Figure 4, and wherein the open end of each tipper is located at a side of the circumferencial direction main line on the tire centre line C L.Comparative example 1 is a decorative pattern shown in Figure 5.In comparative example 1, in half fetus face of the right side of Fig. 5, the closed end of the stria that extends from each inclination cros-rib tread groove with respect to the end of the inclination cros-rib tread groove of adjacency up, is positioned at below rather than top.In half fetus face of a left side, the closed end of stria is positioned at top rather than below with respect to the end of the inclination cros-rib tread groove of adjacency below Fig. 5.Example in the past is a decorative pattern shown in Figure 6.The size of each decorative pattern and performance evaluation result are as shown in table 1 below.

[table 1]

Can find out by table 1, compare with example in the past that decorative pattern 1,2 has outstanding wet performance and eccentric wear decreases performance with comparative example 1.In other words; Through with the closed end 18b of each stria 18 with respect on second direction in abutting connection with the terminal 16b of the inclination cros-rib tread groove 16 of each inclination cros-rib tread groove 16; Be arranged at the second direction side, comprise that drainage performance and moistening road-holding property, stable wet performance and eccentric wear decrease performance and can improve simultaneously.

(line part of inclination cros-rib tread groove)

Next, produce the tire of decorative pattern 3～9 and comparative example 2, and it is carried out various performance evaluations.Have only the length of above-mentioned line part to be changed between each decorative pattern 3～9 and the comparative example 2.In table 2 and table 3, with the length of line part with length L among Fig. 3 A ₁To length L ₂Ratio represent.

[table 2]

[table 3]

Can find out by table 2 and table 3, compare that decorative pattern 3～9 has outstanding wet performance and eccentric wear decreases performance with comparative example 2 (length of above-mentioned line part is 0%).If the ratio of line part is lower than 3%, then the tire straight line moving performance in dry road-holding property, stability reduces.If this ratio is higher than 75%, then drainage performance reduces, and wet performance reduces.Therefore, line part is preferably 3～75% of the length of inclination cros-rib tread groove on tire circumferential direction.

(the tire width direction length of inclination cros-rib tread groove)

Next, as shown in table 4 below, produce decorative pattern 10～14, and it is carried out various performance evaluations.Have only the length of inclination cros-rib tread groove on tire width direction to be changed between each decorative pattern 10～14.In table 4, with the length of inclination cros-rib tread groove on tire width direction with the width W shown in Fig. 3 A ₁To width W ₂Ratio represent.

[table 4]

Can find out that by table 4 compare with decorative pattern 10, decorative pattern 11～14 has outstanding wet performance.On the other hand, compare with decorative pattern 14, decorative pattern 10～13 has outstanding dry road-holding property, stability.Therefore, the length of inclination cros-rib tread groove on tire width direction be preferably land portion width 50～90%.

(the starting end position of the stria that extends from inclination cros-rib tread groove)

Next, as shown in table 5 below, produce decorative pattern 15～19, and it is carried out various performance evaluations.Have only the starting end position of the stria that extends from inclination cros-rib tread groove to be changed between each decorative pattern 15～19.In table 5, the starting end position of the stria that will extend from inclination cros-rib tread groove is with the width W shown in Fig. 3 A ₃To width W ₂Ratio represent.

[table 5]

Can find out by table 5, among decorative pattern 15～19, compare with 19 that

decorative pattern

16,17,18 has outstanding wet performance and dry road-holding property, stability with decorative pattern 15.Therefore, between the open end of the starting end of above-mentioned stria and inclination cros-rib tread groove the distance on tire width direction be preferably land portion width 5～40%.

(the closed end position of the stria that extends from inclination cros-rib tread groove)

Next,, produce decorative pattern 20～25, and it is carried out various performance evaluations with shown in the table 7 like following table 6.Have only the closed end position of the stria that extends from inclination cros-rib tread groove to be changed between each decorative pattern 20～25.In table 6 and table 7, the closed end position of above-mentioned stria is with the width W shown in Fig. 3 A ₄To width W ₂Ratio represent.

[table 6]

[table 7]

Can find out by table 6 and table 7, among decorative pattern 20～25, compare with 25 that

decorative pattern

21,22,1,23,24 has outstanding eccentric wear and decreases performance with decorative pattern 20.Therefore, between the open end of the closed end of above-mentioned stria and inclination cros-rib tread groove the distance on tire width direction be preferably land portion width 20～60%.In addition,, decorative pattern 22,1,23 decreases performance, above-mentioned distance more preferably 30～50% because having high eccentric wear.

(the stria degree of depth)

Next, as shown in table 8 below, produce decorative pattern 26,27,1, and it is carried out various performance evaluations.In each decorative pattern 26,27,1, have only the groove depth of the stria that extends from inclination cros-rib tread groove to be changed.

[table 8]

Can find out that by table 8 among decorative pattern 26,27,1, the wet performance of decorative pattern 27 is lower.On the other hand, the eccentric wear of decorative pattern 26 damage performance is lower.Decorative pattern 1, its stria degree of depth be inclination cros-rib tread starting end groove, that be positioned at stria groove depth 50～100%, have outstanding wet performance and eccentric wear simultaneously and decrease performance.

(the shallow slot degree of depth)

Next, as shown in table 9 below, produce decorative pattern 28,29,1, and it is carried out various performance evaluations.In each decorative pattern 28,29,1, have only the groove depth of shallow slot (among Fig. 2 A, the 2B by the represented part of symbol 20) to be changed.

[table 9]

Can find out that by table 9 among decorative pattern 28,29,1, the eccentric wear of decorative pattern 28 damage performance is lower.On the other hand, dry road-holding property, the stability of decorative pattern 29 are lower.Decorative pattern 1,2～10% of the degree of depth that its shallow slot degree of depth is the circumferencial direction groove has outstanding dry road-holding property, stability and outstanding wet performance and eccentric wear simultaneously and decreases performance.

(tire shoulder portion cutter groove position)

Next, as shown in table 10 below, produce decorative pattern 30,31,1, and it is carried out various performance evaluations.In each decorative pattern 30,31,1, have only the position of tire shoulder portion cutter groove to be changed.The position of said tire shoulder portion cutter groove is the position of open end on tire circumferential direction of tire shoulder portion cutter groove.This position is recently represented with the percentage of the distance between the open end of the inclination cros-rib tread groove of adjacency; The position of the open end of this tire shoulder portion cutter groove is away from the position of the open end of inclination cros-rib tread groove.

[table 10]

Can find out by table 10, among decorative pattern 30,31,1, decorative pattern 30,31 compare with decorative pattern 1 have equal wet performance, eccentric wear decreases performance, dry road-holding property, stability, has relatively poor decorative pattern noise yet compare with decorative pattern 1.Decorative pattern 1; Length 10% or more of the open end position of its tire shoulder portion cutter groove between the open end of inclination cros-rib tread groove that on the tire circumferential direction is adjacency, below 90%, has outstanding wet performance, eccentric wear decreases performance and produces low decorative pattern noise away from the distance of the open end of inclination cros-rib tread groove.

Though air-inflation tyre of the present invention has been carried out above detailed description, and the present invention is not defined as above-mentioned embodiment, and the mode that can not break away from inventive concept is carried out various modifications to it.

Claims

1. air-inflation tyre, it has tread contour, it is characterized in that, and this tire has in tire protector portion:

Stria or cutter groove; Second party opposite with said first direction extends upward; Each stria or cutter groove have starting end and the closed end in the portion of said land; Each stria or cutter groove are littler than each said inclination cros-rib tread groove in the locational groove width of said starting end, and said starting end is positioned at the mid point of each said inclination cros-rib tread groove;

Each said inclination cros-rib tread groove has curved portions or curve and the line part that comprises said end between said open end and said end, said line part and tire circumferential direction extend approximately abreast;

2. air-inflation tyre according to claim 1 is characterized in that,

Said fetus face, two and half fetus faces in tire line of centers both sides have said inclination cros-rib tread groove and said stria or cutter groove separately;

The said first direction of one said inclination cros-rib tread groove in said two and half fetus faces be called as another the said first direction of said inclination cros-rib tread groove in third direction, said two and half fetus faces be called as the four directions to situation under, said third direction and said four directions are to being opposite directions;

Another said stria or the said second direction of cutter groove that one the said stria in said two and half fetus faces or the said second direction of cutter groove are called as in the 5th direction, said two and half fetus faces is called as under the situation of the 6th direction, and said the 5th direction and said the 6th direction are opposite directions.

3. air-inflation tyre according to claim 1 and 2 is characterized in that, the said open end of said inclination cros-rib tread groove is arranged at the tire line of centers circumferencial direction groove far away of the said fetus face of distance among said two circumferencial direction grooves.

4. air-inflation tyre according to claim 3 is characterized in that, has no the nearer circumferencial direction channel opening of tire line of centers of cros-rib tread groove said fetus face of distance among said two circumferencial direction grooves.

5. according to each described air-inflation tyre of claim 1 to 4, it is characterized in that the degree of depth of each said inclination cros-rib tread groove reduces towards said end from said open end.

6. according to each described air-inflation tyre of claim 1 to 5, it is characterized in that the length of the said line part of each said inclination cros-rib tread groove is 3～75% of the length of each said inclination cros-rib tread groove on tire circumferential direction.

7. according to each described air-inflation tyre of claim 1 to 6, it is characterized in that, the distance between the said end of each said inclination cros-rib tread groove and the said open end on tire width direction be said land portion width 50～90%.

8. according to each described air-inflation tyre of claim 1 to 7; It is characterized in that, the distance between the said open end of the said starting end of each said stria or cutter groove and each said inclination cros-rib tread groove on tire width direction be said land portion width 5～40%.

9. according to each described air-inflation tyre of claim 1 to 8; It is characterized in that, the distance between the said open end of the said closed end of each said stria or cutter groove and each said inclination cros-rib tread groove on tire width direction be said land portion width 20～60%.

10. according to each described air-inflation tyre of claim 1 to 9, it is characterized in that the degree of depth of each said stria or cutter groove is 50～100% of the groove depth of said open end position each said inclination cros-rib tread groove, that be positioned at each said stria or cutter groove.

11., it is characterized in that further portion is provided with said stria of depth ratio or the little shallow slot of cutter groove in said land according to each described air-inflation tyre of claim 1 to 10,

Each shallow slot be arranged at said land portion, in the zone between the position on the tire width direction of the circumferencial direction groove of the open end that does not have each said inclination cros-rib tread groove on the tire circumferential direction of the said end of position on the tire circumferential direction of said closed end and each said inclination cros-rib tread groove between the position and on the tire width direction at the said starting end of each said stria that said inclination cros-rib tread groove from each extends or cutter groove among position and said two the circumferencial direction grooves.

12. air-inflation tyre according to claim 11 is characterized in that, the distance between the said closed end of an end of each said shallow slot and each said stria or cutter groove on tire width direction is for being less than or equal to 2mm.

13., it is characterized in that the distance between the said end of an end of each said shallow slot and each said inclination cros-rib tread groove on tire width direction is for being less than or equal to 2mm according to claim 11 or 12 described air-inflation tyres.

14. according to each described air-inflation tyre of claim 11 to 13, it is characterized in that, the degree of depth of each said shallow slot be each said circumferencial direction groove the degree of depth 2～10%.

15., it is characterized in that having according to each described air-inflation tyre of claim 1 to 14 in the tire shoulder portion of said fetus face: a plurality of tire shoulder portion cros-rib tread groove, it is at the contact jaw opening of said tire shoulder portion, and on tire circumferential direction, arranges; A plurality of tire shoulder portion's strias or tire shoulder portion cutter groove, it is arranged between the said tire shoulder portion cros-rib tread groove that is adjacent to each other separately;

Each said tire shoulder portion cros-rib tread groove is to all said circumferencial direction channel openings, each said tire shoulder portion's stria or the opening of tire shoulder portion cutter groove in said circumferencial direction groove.

16. air-inflation tyre according to claim 15 is characterized in that,

One in the said circumferencial direction groove is provided with the said open end of said inclination cros-rib tread groove and the open end of said tire shoulder portion's stria or tire shoulder portion cutter groove;

The tire circumferential direction position of the tire shoulder portion open end of each said tire shoulder portion's stria or tire shoulder portion cutter groove is away from the tire circumferential direction position of the said open end of each said inclination cros-rib tread groove, between the said open end of each said inclination cros-rib tread groove and the said tire shoulder portion open end the distance on the tire circumferential direction be each said inclination cros-rib tread groove said open end and and the inclination cros-rib tread groove of said inclination cros-rib tread groove adjacency open end between at more than 10% of the length on the tire circumferential direction, below 90%.

17. according to each described air-inflation tyre of claim 1 to 16; It is characterized in that; The said land portion that is provided with said inclination cros-rib tread groove and said stria or cutter groove is set at half and half fetus face in the tire line of centers both sides of said fetus face, between the said tire line of centers of nearer circumferencial direction groove of the said tire line of centers of distance among said two circumferencial direction grooves and said fetus face, is provided with at least 1 circumferencial direction groove.

18. according to each described air-inflation tyre of claim 1 to 16; It is characterized in that; The said land portion that is provided with said inclination cros-rib tread groove and said stria or cutter groove is set at half and half fetus face in the tire line of centers both sides of said fetus face, and one in said two circumferencial direction grooves is set on the said tire line of centers.