CN108501625A

CN108501625A - Tire

Info

Publication number: CN108501625A
Application number: CN201810168003.4A
Authority: CN
Inventors: 长濑博毅
Original assignee: Sumitomo Rubber Industries Ltd
Current assignee: Sumitomo Rubber Industries Ltd
Priority date: 2017-02-28
Filing date: 2018-02-28
Publication date: 2018-09-07
Anticipated expiration: 2038-02-28
Also published as: JP6828512B2; CN108501625B; JP2018140745A

Abstract

The present invention provides a kind of tire not only having maintained wet road performance but also have excellent resistance to partial wear performance.The tire has the fetus face (2) for specifying the direction installed to vehicle.The first costa colpi (16a) and the second costa colpi (16b) for being set to the external shoulder traverse furrow (16) in external shoulder land portion (10) intersect with outside tyre surface end (To) in the first intersection point (21) and the second intersection point (22) respectively.The third costa colpi (17a) and the 4th costa colpi (17b) for being set to the inside tire-shoulder transverse groove (17) in inside tire-shoulder land portion intersect with inner tread end (Ti) in third intersection point (23) and the 4th intersection point (24) respectively.First intersection point (21) and the second intersection point (22) are respectively arranged at from third intersection point (23) and the 4th intersection point (24) in the circumferentially upper different position of tire.

Description

Tire

Technical field

The present invention relates to the tires with excellent resistance to partial wear performance.

Background technology

For example, proposing there is a kind of wheel for the fetus face for having and specifying the direction installed to vehicle in following patent documents 1 Tire.The tire has when being installed on vehicle the position positioned at the external shoulder land portion of vehicle outside and when being installed on vehicle In the inside tire-shoulder land portion of vehicle interior side.Tire-shoulder land portion is provided with extension on the inside of from tyre surface end to tire axial on the outside A plurality of external shoulder traverse furrow.The a plurality of inside tire extended on the inside of from tyre surface end to tire axial is provided in inside tire-shoulder land portion Shoulder traverse furrow.Above-mentioned tire-shoulder transverse groove makes the water in ground plane be discharged to tyre surface end side, and improves wet road performance.

In above-mentioned tire, the costa colpi of each external shoulder traverse furrow intersects with tyre surface end in the first intersection point and the second intersection point. The costa colpi of each inside tire-shoulder transverse groove intersects with tyre surface end in third intersection point and the 4th intersection point.

Usually in tire running, traverse furrow above-mentioned first intersection point~the 4th intersection point position and road surface ground connection moment And the moment left from road surface, land portion are substantially slided relative to road surface.The sliding in such land portion leads to land portion Abrasion.In particular, if the first intersection point or the second intersection point are grounded with third intersection point or the 4th intersection point or are detached from road surface simultaneously, in The tire-shoulder land portion in side and outside is slided simultaneously relative to road surface, and the slippage in land portion when to tire running becomes larger. Such sliding repeated, so there is the partial wear of the costa colpi abrasion ahead of time nearby for the traverse furrow for encouraging fetus face (for example, heel Toe wear) trend.

Patent document 1：Japanese Unexamined Patent Publication 2016-150601 bulletins

Invention content

The present invention is to propose in view of the above problems, main purpose be to provide it is a kind of not only having maintained wet road performance but also Tire with excellent resistance to partial wear performance.

The present invention relates to tires, and with the fetus face for specifying the direction installed to vehicle, above-mentioned fetus face includes：Outside Tire-shoulder land portion, it includes the outside tyre surface ends when being installed on vehicle positioned at vehicle outside；And inside tire-shoulder land portion, Included in the inner tread end positioned at vehicle interior side when being installed on vehicle, it is provided at least from upper in above-mentioned external shoulder land portion Outside tyre surface end is stated to a plurality of external shoulder traverse furrow extended on the inside of tire axial, above-mentioned inside tire-shoulder land portion be provided with to Few a plurality of inside tire-shoulder transverse groove extended from above-mentioned inner tread end to tire axial inside, each above-mentioned external shoulder traverse furrow have Positioned at the first costa colpi of side, that is, first direction of tire circumferential direction, and positioned at opposite with above-mentioned first direction in tire circumferential direction Second costa colpi of the second direction of side, above-mentioned first costa colpi and above-mentioned second costa colpi are respectively with above-mentioned outside tyre surface end first Intersection point and the intersection of the second intersection point, each above-mentioned inside tire-shoulder transverse groove have the third for being located at above-mentioned first direction in tire circumferential direction Costa colpi and the 4th costa colpi for being located at above-mentioned second direction in tire circumferential direction, above-mentioned third costa colpi and above-mentioned 4th costa colpi Intersect respectively in third intersection point and the 4th intersection point with above-mentioned inner tread end, above-mentioned first intersection point and above-mentioned second intersection point point It is not set to from above-mentioned third intersection point and above-mentioned 4th intersection point in the circumferentially upper different position of tire.

The tire of the present invention preferably in the group of the intersection point of circumferentially upper closest the first intersection point positioned of tire~the 4th, Towards above-mentioned second direction by the suitable of above-mentioned first intersection point, above-mentioned second intersection point, above-mentioned third intersection point and above-mentioned 4th intersection point Sequence is along tire circumferential array.

In the tire of the present invention, preferably above-mentioned second intersection point is at a distance from the tire circumferential direction between above-mentioned third intersection point L1 is less than furrow width and above-mentioned inside tire-shoulder transverse groove of the above-mentioned external shoulder traverse furrow at above-mentioned outside tyre surface end in above-mentioned inside Furrow width at tyre surface end.

In the tire of the present invention, preferably above-mentioned distance L1 is 0.2~1.0mm.

In the tire of the present invention, preferably above-mentioned external shoulder traverse furrow crosscutting above-mentioned external shoulder land portion completely.

In the tire of the present invention, the inner end of the tire axial of preferably above-mentioned inside tire-shoulder transverse groove is located at above-mentioned inside tire shoulder In the portion of land.

In the tire of the present invention, preferably above-mentioned external shoulder traverse furrow and above-mentioned inside tire-shoulder transverse groove are respectively relative to take turns Axially there is tire the angle less than 10 °, the maximum angle relative to tire axial of above-mentioned inside tire-shoulder transverse groove to be less than outside above-mentioned The maximum angle relative to tire axial of side tire-shoulder transverse groove.

In the tire of the present invention, above-mentioned external shoulder land portion is preferably provided with external shoulder cutter groove, above-mentioned interior Side tire-shoulder land portion is provided with inside tire shoulder cutter groove, and above-mentioned external shoulder cutter groove and above-mentioned inside tire shoulder cutter groove are respectively provided with shallow Bottom and deep bottom, above-mentioned depth bottom have the depth bigger than above-mentioned shallow bottom, the above-mentioned shallow bottom of above-mentioned external shoulder cutter groove It is set on the inside of the tire axial of above-mentioned deep bottom of above-mentioned external shoulder cutter groove, the above-mentioned shallow bottom of above-mentioned inside tire shoulder cutter groove It is set on the outside of the tire axial of above-mentioned deep bottom of above-mentioned inside tire shoulder cutter groove.

Each external shoulder traverse furrow for being set to external shoulder land portion of the tire of the present invention has and is located at tire circumferential direction First costa colpi of side, that is, first direction and in tire circumferential direction be located at the second direction of first direction opposite side second Costa colpi.First costa colpi and the second costa colpi intersect with outside tyre surface end in the first intersection point and the second intersection point respectively.

Each inside tire-shoulder transverse groove for being set to inside tire-shoulder land portion has in tire circumferential direction positioned at the of first direction Three costa colpis and the 4th costa colpi for being located at second direction in tire circumferential direction.Third costa colpi and the 4th costa colpi respectively with inside Tyre surface end intersects in third intersection point and the 4th intersection point.

In the tire of the present invention, above-mentioned first intersection point and above-mentioned second intersection point are respectively arranged at and above-mentioned third intersection point And above-mentioned 4th intersection point is in the circumferentially upper different position of tire.Therefore, according to the present invention, in tire running, each intersection point exists Different opportunity ground connection, therefore the tire-shoulder land portion in inside and outside can be inhibited relative to road surface while being slided.Therefore, root The tire shoulder of both sides when according to the tire of the present invention, can not only maintain the wet road performance based on tire-shoulder transverse groove, but also reduce tire running The slippage in land portion, and then excellent resistance to partial wear performance is provided.

Description of the drawings

Fig. 1 is the expanded view of the fetus face of the tire of an embodiment of the invention.

Fig. 2 is the enlarged drawing in the external shoulder land portion of Fig. 1.

Fig. 3 is the enlarged drawing in the inside tire-shoulder land portion of Fig. 1.

Fig. 4 is the external shoulder traverse furrow of Fig. 1 and the partial enlarged view of inside tire-shoulder transverse groove.

(a) in Fig. 5 is the line A-A sectional view of Fig. 3, and (b) in Fig. 5 is the line B-B sectional view of Fig. 2, (c) in Fig. 5 It is the line C-C sectional view of Fig. 3.

Fig. 6 is the enlarged drawing in land portion among the outside of Fig. 1.

Fig. 7 is the external shoulder traverse furrow of Fig. 1 and the partial enlarged view of outside middle transverse groove.

(a) in Fig. 8 is the line D-D sectional view of Fig. 6, and (b) in Fig. 8 is the E-E line sectional views of Fig. 6.

Fig. 9 is the enlarged drawing in land portion and tire crown land portion among the inside of Fig. 1.

(a) in Figure 10 is the F-F line sectional views of Fig. 9, and (b) in Figure 10 is the G-G line sectional views of Fig. 9, in Figure 10 (c) be Fig. 9 H-H line sectional views, (d) in Figure 10 is the I-I line sectional views of Fig. 9.

Reference sign：

2 ... fetus faces；10 ... external shoulder land portion；11 ... insides tire-shoulder land portion；16 ... external shoulder traverse furrows； The first costa colpis of 16a ...；The second costa colpis of 16b ...；17 ... inside tire-shoulder transverse grooves；17a ... third costa colpis；The 4th costa colpis of 17b ...；21… First intersection point；22 ... second intersection points；23 ... third intersection points；24 ... the 4th intersection points；The outsides To ... tyre surface end；Ti ... inner treads End.

Specific implementation mode

Hereinafter, being illustrated to an embodiment of the invention in conjunction with attached drawing.

Fig. 1 is the expanded view of the fetus face 2 of the tire 1 of present embodiment.The tire 1 of present embodiment can for example use The various wheels such as the non-inflatable tire of forced air for the car, pneumatic tire of load-carrying and are filled to the inside of tire Tire.The tire 1 of present embodiment is for example applicable in the pneumatic tire for car.

As shown in Figure 1, the tire 1 of present embodiment is for example with the fetus face 2 for specifying the direction installed to vehicle.Tire Face 2 has to be located at when tire 1 is installed on vehicle positioned at the outside tyre surface end To of vehicle outside and when being installed on vehicle The inner tread end Ti of vehicle interior side.For the direction installed to vehicle, such as it is shown in side of sidewall portion using word or symbol and (saves Sketch map shows).

Each tyre surface end To, Ti refer in the case of pneumatic tire to the tire 1 of normal state load regular load and with 0 ° of camber angle is grounded on the outermost earthing position of tire axial when plane.Normal state refers to being assembled in positive gauge wheel in tire Rim and the regular internal pressure of filling, and non-loaded state.In the present specification, in the case of non-special declaration, each portion of tire Size etc. be the value determined under above-mentioned normal state.

" regular wheel rim " refers to being advised for each tire in the schematism including specification based on tire The wheel rim of the fixed specification is then " Design Rim " if TRA, if ETRTO for example, being then " standard rim " if JATMA It is then " Measuring Rim ".

" regular internal pressure " refers to being advised for each tire in the schematism including specification based on tire The air pressure of fixed each specification, is then " highest air pressure " if JATMA, is then table " TIRE LOAD LIMITS AT if TRA Maximum value recorded in VARIOUS COLD INFLATION PRESSURES " is then " INFLATION if ETRTO PRESSURE”。

" regular load " refers to being advised for each tire in the schematism including specification based on tire The load of fixed each specification is then table " TIRE LOAD if TRA for example, being then " maximum load capability " if JATMA Maximum value recorded in LIMITS AT VARIOUS COLD INFLATION PRESSURES ", is then " LOAD if ETRTO CAPACITY”。

It is provided in the circumferentially continuous a plurality of tap drain that extends of ground of tire in fetus face 2.A plurality of tap drain is for example including outside tire Shoulder tap drain 3, inside shoulder main groove 4, outside crown tap drain 5 and inner tyre crown tap drain 6.Each tap drain of present embodiment 3~6 As linearly extended, but it is not limited to such mode, such as extended with can also being serrated.

External shoulder tap drain 3 is for example set in a plurality of tap drain near the outside sides tyre surface end To.Inside shoulder main groove 4 It is such as set in a plurality of tap drain near the inside sides tyre surface end Ti.Outside crown tap drain 5 be for example set to external shoulder tap drain 3 with Between tire equator C.Inner tyre crown tap drain 6 is for example set between inside shoulder main groove 4 and tire equator C.

External shoulder tap drain 3 and inside shoulder main groove 4 are respectively for example preferably from tire equator C to the distance of ditch center line L2 is 0.25~0.35 times of tread width TW.Outside crown tap drain 5 and inner tyre crown tap drain 6 are respectively for example preferably from tire The distance L3 of equator C to ditch center line is 0.05~0.15 times of tread width TW.Tread width TW is under above-mentioned normal state From outside tyre surface end To the distance of the tire axial of inner tread end Ti.

Inside shoulder main groove 4, outside crown tap drain 5 and inner tyre crown tap drain 6 for example preferably have the 5 of tread width TW ~8% furrow width W1a, W1b, W1c.External shoulder tap drain 3 for example preferably has less than the furrow width of above-mentioned furrow width W1a~W1c W1d.The furrow width W1d of external shoulder tap drain 3 is for example preferably 0.40~0.50 times of the furrow width W1a of inside shoulder main groove 4.By This, can balancedly improve wet road performance and control stability.

Each tap drain 3~6 is in the case where tire is passenger car tire, such as the depth preferably with 5~10mm or so.This Each tap drain 3~6 of sample can balancedly improve wet road performance and control stability.But the size of each tap drain 3~6 does not limit In above-mentioned range.

By being provided with above-mentioned tap drain 3~6, to have external shoulder land portion 10, inside tire shoulder in the division of fetus face 2 Land portion 12, inside centre land portion 13 and tire crown land portion 14 among land portion 11, outside.10 quilt of external shoulder land portion It is divided on the outside of the tire axial of external shoulder tap drain 3, including outside tyre surface end To.In inside tire-shoulder land portion 11 is divided in On the outside of the tire axial of side shoulder main groove 4, including inner tread end Ti.Land portion 12 is divided in external shoulder master among outside Between ditch 3 and outside crown tap drain 5.Among inside land portion 13 be divided in inside shoulder main groove 4 and inner tyre crown tap drain 6 it Between.Tire crown land portion 14 is divided between outside crown tap drain 5 and inner tyre crown tap drain 6.

Fig. 2 shows the enlarged drawings in external shoulder land portion 10.As shown in Fig. 2, tire-shoulder land portion 10 is provided on the outside A plurality of external shoulder traverse furrow 16.

Each external shoulder traverse furrow 16 at least extends from outside tyre surface end To tire axial inside.In preferred mode, The crosscutting external shoulder land portion 10 completely of external shoulder traverse furrow 16.

Each external shoulder traverse furrow 16 has the first costa colpi 16a and the second costa colpi 16b.First costa colpi 16a is located at tire week To side, that is, first direction.Second costa colpi 16b is circumferentially located at the second direction with first direction opposite side in tire.First ditch Edge 16a and the second costa colpi 16b intersects with outside tyre surface end To in the first intersection point 21 and the second intersection point 22 respectively.

Fig. 3 shows the enlarged drawing in inside tire-shoulder land portion 11.As shown in figure 3, being provided in inside tire-shoulder land portion 11 A plurality of inside tire-shoulder transverse groove 17.

Each inside tire-shoulder transverse groove 17 at least extends from inner tread end Ti to tire axial inside.In preferred mode, The inner end 17i of the tire axial of inside tire-shoulder transverse groove 17 is located in inside tire-shoulder land portion 11.

Each inside tire-shoulder transverse groove 17 has third costa colpi 17a and the 4th costa colpi 17b.Third costa colpi 17a is in tire circumferential direction It is upper to be located at above-mentioned first direction.4th costa colpi 17b is located at above-mentioned second direction in tire circumferential direction.Third costa colpi 17a and Four costa colpi 17b intersect with inner tread end Ti in third intersection point 23 and the 4th intersection point 24 respectively.

Fig. 4 shows external shoulder traverse furrow 16 and the partial enlarged view of inside tire-shoulder transverse groove 17.As shown in figure 4, first Intersection point 21 and the second intersection point 22 are respectively arranged at from third intersection point 23 and the 4th intersection point 24 in the circumferentially upper different position of tire It sets.Therefore, according to the present invention, in tire running, since each intersection point 21~24 is grounded on different opportunitys, can inhibit The tire-shoulder land portion 10,11 in inside and outside is slided simultaneously relative to road surface.Therefore, tire 1 according to the present invention, can be both Maintain the wet road performance based on tire-shoulder transverse groove 16,17, and the sliding in the tire-shoulder land portion 10,11 of both sides when reduction tire running Amount, and then excellent resistance to partial wear performance is provided.

In preferred mode, in circumferentially upper closest the 21~the 4th 24 1 groups of the intersection point of the first intersection point positioned of tire In, towards second direction by the sequence of the first intersection point 21, the second intersection point 22, third intersection point 23 and the 4th intersection point 24 along tire week To arrangement.The configuration of the 21~the 4th intersection point 24 of such first intersection point, can more reliably play above-mentioned effect.But this Invention is not limited to such mode, such as can also be that third intersection point 23 is located at the first intersection point 21 and second in tire circumferential direction Mode between intersection point 22.

The circumferential distance L1 of tire of second intersection point 22 between third intersection point 23, e.g. preferably smaller than external shoulder traverse furrow 16 furrow widths of the furrow width W2 (shown in Fig. 2) and inside tire-shoulder transverse groove 17 at tyre surface end To at the tyre surface end Ti of inside on the outside W3 (shown in Fig. 3).In the case where distance L1 is more than above-mentioned furrow width W2, W3, there are the increased worries of the vibration of tire.

More specifically, above-mentioned distance L1 is preferably 0.2mm or more, more preferably 0.4mm or more, preferably 1.0mm with Under, more preferably 0.8mm or less.Thereby, it is possible to play excellent resistance to partial wear performance, and the cooperation hair of tire-shoulder transverse groove 16,17 Wave excellent drainage.

As shown in FIG. 2 and 3, the above-mentioned furrow width W2 of external shoulder traverse furrow 16 and the furrow width of inside tire-shoulder transverse groove 17 W3, such as 0.8~1.2 times of the preferably furrow width W1d (shown in Fig. 1) of external shoulder tap drain 3.In addition, above-mentioned furrow width W2 with it is upper It is preferably 0.8~1.2 to state the ratio between furrow width W3 W2/W3 for example.Such external shoulder traverse furrow 16 and inside tire-shoulder transverse groove 17 have Help balancedly improve wet road performance and resistance to partial wear performance.

External shoulder traverse furrow 16 and inside tire-shoulder transverse groove 17 are for example respectively provided with relative to tire axial preferably less than 20 °, more preferably less than 10 ° of angle.In the present specification, ditch refers to the center line phase of ditch relative to the angle of tire axial For the angle of tire axial.Such external shoulder traverse furrow 16 and inside tire-shoulder transverse groove 17 and above-mentioned first intersection point 21~ The configuration of 4th intersection point 24 interacts, and when driving, flow can be integrally formed using ditch, so as to the row of raising in the roads Er Shi It is aqueous.

In preferred mode, the angle court of external shoulder traverse furrow 16 and inside tire-shoulder transverse groove 17 relative to tire axial It is gradually increased to the sides tire equator C.In preferred mode, the maximum angular relative to tire axial of inside tire-shoulder transverse groove 17 Spend the maximum angle θ 1 relative to tire axial that θ 2 is less than external shoulder traverse furrow 16.Thereby, it is possible to improve inside tire-shoulder land The abrasion resistance properties in portion 11.

Inside tire-shoulder transverse groove 17 for example preferably with inside tire-shoulder land portion 11 tire axial width W4 0.75~ The length L4 of 0.85 times of tire axial.Such inside tire-shoulder transverse groove 17 is able to maintain that the tire axis in inside tire-shoulder land portion 11 Rigidity inwardly.Therefore, it is possible to balancedly improve wet road performance and control stability.

(a) in Fig. 5 shows the line A-A sectional view of the inside tire-shoulder transverse groove 17 of Fig. 3.It is interior as shown in (a) in Fig. 5 Side tire-shoulder transverse groove 17 for example preferably in the inner end of tire axial, have the angle, θ 3 relative to the normal across tread be 40~ 50 ° of ramped bottom surface 25.It is excellent so as to obtain thereby, it is possible to prevent the rigid localized variation in inside tire-shoulder land portion 11 Resistance to partial wear performance.

As shown in Fig. 2, tire-shoulder land portion 10 is provided with a plurality of external shoulder cutter groove 18 on the outside.In the present embodiment, External shoulder cutter groove 18 is circumferentially alternately arranged with external shoulder traverse furrow 16 in tire.In the present specification, " cutter groove " is finger beam Spend the grooving less than 3mm.

The external shoulder cutter groove 18 of present embodiment such as crosscutting external shoulder land portion 10 completely.External shoulder cutter groove 18 Such as it is tilted towards direction identical with external shoulder traverse furrow 16 preferably with respect to tire axial.In preferred mode, outside tire Shoulder tool slot 18 is for example configured relative to tire axial with 5~10 ° of angle, θ 4.

(b) in Fig. 5 shows the line B-B sectional view of the external shoulder cutter groove 18 of Fig. 2.As shown in (b) in Fig. 5, outside For side tire shoulder cutter groove 18 for example with shallow bottom 26 and deep bottom 27, above-mentioned depth bottom has the depth bigger than shallow bottom 26.Shallow bottom 0.10~0.20 times of the depth d2 of such as depth d1 with external shoulder tap drain 3 of portion 26.Deep bottom 27 is for example with outside 0.55~0.65 times of the depth d3 of the depth d1 of shoulder main groove 3.For the external shoulder cutter groove 18 of present embodiment, such as Shallow bottom 26 is set on the inside of the tire axial of deep bottom 27.Such external shoulder cutter groove 18 helps to inhibit external shoulder Abrasion on the inside of the tire axial in land portion 10.

As further preferred mode, even if the external shoulder cutter groove 18 of present embodiment preferably on the outside tyre surface end To Outside, be also equipped with the shallow bottom 28 that depth is less than deep bottom 27.Such external shoulder cutter groove 18 can both improve drift Performance inhibits the partial wear of the outside vicinity tyre surface end To again.

As shown in figure 3, being provided with a plurality of inside tire shoulder cutter groove 19 in inside tire-shoulder land portion 11.In the present embodiment, Inside tire shoulder cutter groove 19 is alternately arranged with inside tire-shoulder transverse groove 17 in tire circumferential direction.

The inside tire shoulder cutter groove 19 of present embodiment such as crosscutting inside tire-shoulder land portion 11 completely.Inside tire shoulder cutter groove 19 Such as it is preferably tilted towards direction identical with inside tire-shoulder transverse groove 17.In preferred mode, inside tire shoulder cutter groove 19 is for example excellent Phase selection tilts tire axial with 5~10 ° of angle, θ 5.

(c) in Fig. 5 shows the line C-C sectional view of inside tire shoulder cutter groove 19.As shown in (c) in Fig. 5, inside tire shoulder For cutter groove 19 for example with shallow bottom 31 and deep bottom 32, above-mentioned depth bottom has the depth bigger than shallow bottom 31.Shallow bottom 31 Such as 0.10~0.20 times of the depth d5 of the depth d4 preferably with inside shoulder main groove 4.Deep bottom 32 for example preferably has interior 0.55~0.65 times of the depth d6 of the depth d4 of side shoulder main groove 4.It, will for the inside tire shoulder cutter groove 19 of present embodiment Shallow bottom 31 is set on the outside of the tire axial of deep bottom 32.Such inside tire shoulder cutter groove 19 is able to maintain that inside tire-shoulder land Rigidity near the inner tread end Ti in portion 11, and then prevent the reduction of control stability.

Fig. 6 shows the enlarged drawing in the intermediate land in outside portion 12.As shown in fig. 6, intermediate land portion 12 is for example set on the outside It is equipped with cutter groove 36 among a plurality of outside middle transverse groove 35 and a plurality of outside.In the present embodiment, outside middle transverse groove 35 with Cutter groove 36 is alternately arranged in tire circumferential direction among outside.

Such as inside from external shoulder tap drain 3 to tire axial of outside middle transverse groove 35 extends and intermediate land on the outside It is interrupted in portion 12.The 0.55 of the width W5 of tire axial of the outside middle transverse groove 35 for example preferably with outside centre land portion 12 The length L5 of~0.65 times of tire axial.Such outside middle transverse groove 35 can both maintain the rigid of the intermediate land in outside portion 12 Property improves wet road performance again.

Fig. 7 shows external shoulder traverse furrow 16 and the partial enlarged view of outside middle transverse groove 35.As shown in fig. 7, outside Middle transverse groove 35 is for example smoothly continuous preferably via external shoulder tap drain 3 and external shoulder traverse furrow 16.It is travelled as a result, on wet road When, outside middle transverse groove 35 and external shoulder traverse furrow 16 cooperate and a large amount of water can be discharged.In addition, in the present specification, " two bar ditch or cutter groove are smoothly continuous via tap drain " includes：The ditch at least making either side to its length direction smoothly After extension, more than half mode Chong Die with the ditch of another party of the furrow width of the ditch of one side.

In the present embodiment, when each costa colpi for making external shoulder traverse furrow 16 smoothly extends to its length direction, with The offset P1 (illustration omitted) of each costa colpi of outside middle transverse groove 35 is preferably the 0.10 of the furrow width W6 of outside middle transverse groove 35 Times or less.In preferred mode, above-mentioned offset P1 is 0.4mm or less.Such outside middle transverse groove 35 is in wet road row When sailing, the water in ditch can more swimmingly be guided to 16 side of external shoulder traverse furrow.

(a) in Fig. 8 shows the line D-D sectional view of the outside middle transverse groove 35 of Fig. 6.As shown in (a) in Fig. 8, this The outside middle transverse groove 35 of embodiment is for example with gradual increase portion 37 and outside portion 38.The depth direction in gradual increase portion 37 Gradually increase on the outside of tire axial.Outside portion 38 is configured on the outside of the tire axial in gradual increase portion 37, and has constant depth Degree.Such outside middle transverse groove 35 prevents the locality variation of the rigidity in the intermediate land in outside portion 12, and then inhibits in outside Between land portion 12 partial wear.

In order to make above-mentioned effect further play, the length L6 of the tire axial in gradual increase portion 37 is preferably in outside Between 0.35~0.45 times of width W5 (shown in Fig. 6) of tire axial of land portion 12.The bottom surface in gradual increase portion 37 is for example excellent Phase selection tilts the normal of the tread across land portion with 60~70 ° of angle, θ 6.

As shown in fig. 6, among for example completely crosscutting outside of cutter groove 36 land portion 12 among outside.Cutter groove 36 among outside As tilted in identical direction (shown in Fig. 2) towards with external shoulder cutter groove 18 preferably with respect to tire axial.Cutter groove among outside Angle, θ 7 relative to tire axial is for example preferably 5~15 °.

As shown in fig. 7, cutter groove 36 is for example smooth preferably via external shoulder tap drain 3 and external shoulder cutter groove 18 among outside Ground is continuous.The intermediate cutter groove 36 in outside and external shoulder cutter groove 18 are easily opened in ground connection as a result, therefore utilize above-mentioned side Edge can obtain high frictional force.

(b) in Fig. 8 shows the E-E line sectional views of cutter groove 36 among the outside of Fig. 6.As shown in (b) in Fig. 8, outside For example preferably there is cutter groove 36 shallow bottom 39 and deep bottom 40, above-mentioned depth bottom to have the depth bigger than shallow bottom 39 among side. For cutter groove 36 among the outside of present embodiment, shallow bottom 39 is set on the outside of the tire axial of deep bottom 40.

The depth d7 of the shallow bottom 39 of cutter groove 36 is for example preferably the 0.10 of the depth d1 of external shoulder tap drain 3 among outside ~0.20 times.The depth d8 of the deep bottom 40 of cutter groove 36 is for example preferably the depth d1 of external shoulder tap drain 3 among outside 0.55~0.65 times.Cutter groove 36 can not only inhibit the partial wear in the intermediate land in outside portion 12 but also improve wet road among such outside Performance.

Fig. 9 shows the enlarged drawing in intermediate land portion 13 and tire crown land portion 14.As shown in figure 9, the land among inside Ground portion 13 is for example provided with cutter groove 42 among a plurality of inside.In preferred mode, land portion 13 is provided only among inside Cutter groove 42 among inside is not provided with the ditch that width is 3mm or more.

Land portion 13 among for example completely crosscutting inside of cutter groove 42 among inside.Cutter groove 42 is for example relative to wheel among inside Tire is axial to be tilted towards the direction opposite with external shoulder traverse furrow 16.Among inside cutter groove 42 for example preferably with respect to tire axial with 20~30 ° of angle, θ 8 tilts.

Tap drain cutter groove 42 central portion 43 for example with tire axial among inside and extend to both sides from central portion 43 End part 44.The central portion 43 of present embodiment is different from such as depth of end part 44.

(a) in Figure 10 shows that the F-F line sectional views of cutter groove 42 among the inside of Fig. 9, (b) in Figure 10 show figure The G-G line sectional views of 9 central portion 43.As in Figure 10 (a) and (b) shown in, central portion 43 is for example with 1.0~2.0mm Depth d9.Width W7 of the central portion 43 of present embodiment for example preferably with the tire axial in land portion 13 among inside The length L7 of 0.30~0.40 times of the tire axial of (shown in Fig. 9) (shown in Fig. 9).Thereby, it is possible to maintain the intermediate land in inside The rigidity in portion 13, and excellent control stability can be obtained.

(c) in Figure 10 shows the H-H line sectional views of the end part 44 of Fig. 9.As shown in (c) in Figure 10, this implementation The end part 44 of mode is for example comprising first part 45 and second part 46.First part 45 is for example with identical as central portion 43 Width opening.In preferred mode, first part 45 is for example with depth identical with central portion 43.Second part 46 It is such as configured at the bottom of first part 45, is radially extended along tire with the width less than first part 45.Such end part 44 Big frictional force is capable of providing using edge.

In order to balancedly improve wet road performance and control stability, the depth d10 of end part 44 is for example preferably inside tire 0.35~0.45 times of the depth d4 of shoulder tap drain 4.

As shown in figure 9, being for example provided with a plurality of crown cutter groove 47 in tire crown land portion 14.In preferred mode, in tire Hat land portion 14 is provided only with crown cutter groove 47, is not provided with the ditch that width is 3mm or more.

Such as crosscutting tire crown land portion 14 completely of crown cutter groove 47.The crown cutter groove 47 of present embodiment is for example with tire The end part 49 of axial central portion 48 and the tap drain that both sides are extended to from central portion 48.In the present embodiment, crown cutter groove 47 central portion 48 has the section shape practically identical (shown in (b) in Figure 10) with the central portion 43 of cutter groove 42 among inside Shape.The end part 49 of crown cutter groove 47 has with the end part 44 of cutter groove 42 among inside (shown in (c) in Figure 10) actually Identical section shape.

The central portion 48 of the crown cutter groove 47 of present embodiment is for example tilted relative to tire axial.In preferred mode In, the central portion 48 of crown cutter groove 47 is tilted towards the direction opposite with cutter groove 42 among inside.The central portion 48 of crown cutter groove 47 The angle, θ 9 relative to tire axial for example be preferably 50~70 °.

The end part 49 of crown cutter groove 47 is for example tilted preferably with respect to tire axial towards the direction opposite with central portion.End Part 49 is for example tilted preferably with respect to tire axial with 20~30 ° of angle, θ 10.Angle between end part 49 and central portion 48 It is preferably 80~100 ° to spend θ 10 for example.Such crown cutter groove 47 can be to multi-direction performance frictional force using its edge.

(d) in Figure 10 shows the I-I line sectional views of the crown cutter groove 47 of Fig. 9.As shown in (d) in Figure 10, crown The end part 49 of cutter groove 47 for example preferably has the depth d12 bigger than the depth d11 of central portion 48.The depth d12 of end part 49 Such as 3.0~3.5 times of the preferably depth d11 of central portion 48.Such crown cutter groove 47 can both maintain tire crown land portion 14 wear resistance improves wet road performance again.

More than, the tire of an embodiment of the invention is illustrated in detail, but the present invention is not limited to upper Specific embodiment is stated, various modes can be changed to implement.

[embodiment]

The pneumatic tire of the size 255/55R18 of the basic tread contour with Fig. 1 has been manufactured experimently according to the specification of table 1.Make For comparative example, the tire that the second intersection point is in identical position with third intersection point in tire circumferential direction has been manufactured experimently.To each testing wheel The resistance to partial wear performance and wet road performance of tire are tested.Common specification, the test method of each test tire are as described below.

Wheel rim:18×8.0J

Inner pressure of tire：240kPa

The resistance to partial wear performance ＞ of ＜

The abrasion energy in each tire-shoulder land portion is determined using abrasion energometry device.The result is that with comparative example Abrasion energy be 100 exponential representation, numerical value is smaller, abrasion energy it is smaller, resistance to partial wear performance is more excellent.

＜ wet road performances ＞

On the inside of use drum tester to the condition stated below each test tire in the drum surface of depth of water 5.0mm when driving The generation speed of slipping phenomenon is determined.The result is that the exponential representation for being 100 with comparative example, numerical value is bigger, above-mentioned generation Speed is faster, and wet road performance is more excellent.

Drift angle：1.0°

Longitudinal loading：4.2kN

Test result is shown in Table 1.

[table 1]

The result of test is able to confirm that：The tire of embodiment had not only maintained wet road performance but also had played excellent resistance to partial wear Energy.

Claims

1. a kind of tire has the fetus face for specifying the direction installed to vehicle, which is characterized in that

The fetus face includes：External shoulder land portion, it includes the outside tyre surfaces when being installed on vehicle positioned at vehicle outside End；And inside tire-shoulder land portion, it includes the inner tread end when being installed on vehicle positioned at vehicle interior side,

External shoulder land portion be provided with extend on the inside of at least from the outside tyre surface end to tire axial it is a plurality of outer Side tire-shoulder transverse groove,

Inside tire-shoulder land portion be provided with extend on the inside of at least from the inner tread end to tire axial it is a plurality of in Side tire-shoulder transverse groove,

Each external shoulder traverse furrow had the first costa colpi of side, that is, first direction positioned at tire circumferential direction and in tire week It is located at the second costa colpi of the second direction of side opposite to the first direction, first costa colpi and second costa colpi upwards Intersect respectively in the first intersection point and the second intersection point with the outside tyre surface end,

Each inside tire-shoulder transverse groove has circumferentially is located at the third costa colpi of the first direction and in tire circumferential direction in tire Upper the 4th costa colpi positioned at the second direction, the third costa colpi and the 4th costa colpi respectively with the inner tread end Intersect in third intersection point and the 4th intersection point,

First intersection point and second intersection point are respectively arranged at is taking turns with the third intersection point and the 4th intersection point The circumferentially upper different position of tire,

In the group of the intersection point of circumferentially upper closest the first intersection point positioned of tire~the 4th, institute is pressed towards the second direction The sequence of the first intersection point, second intersection point, the third intersection point and the 4th intersection point is stated along tire circumferential array.

2. tire according to claim 1, which is characterized in that

The circumferential distance L1 of tire of second intersection point between the third intersection point, is less than the external shoulder traverse furrow in institute State furrow width of the furrow width and the inside tire-shoulder transverse groove at the tyre surface end of outside at the inner tread end.

3. tire according to claim 2, which is characterized in that

The distance L1 is 0.2~1.0mm.

4. tire described in any one of claim 1 to 3, which is characterized in that

The external shoulder traverse furrow crosscutting external shoulder land portion completely.

5. tire according to any one of claims 1 to 4, which is characterized in that

The inner end of the tire axial of the inside tire-shoulder transverse groove is located in inside tire-shoulder land portion.

6. tire according to any one of claims 1 to 5, which is characterized in that

The external shoulder traverse furrow and the inside tire-shoulder transverse groove, which are respectively relative to tire axial, has angle less than 10 °,

The maximum angle relative to tire axial of the inside tire-shoulder transverse groove is less than the external shoulder traverse furrow relative to wheel The maximum angle of tire axial direction.

7. according to tire according to any one of claims 1 to 6, which is characterized in that

External shoulder land portion is provided with external shoulder cutter groove,

Inside tire-shoulder land portion is provided with inside tire shoulder cutter groove,

The external shoulder cutter groove and the inside tire shoulder cutter groove are respectively provided with shallow bottom and deep bottom, and the depth bottom has The depth bigger than the shallow bottom,

The shallow bottom of the external shoulder cutter groove is set to the tire axial of the deep bottom of the external shoulder cutter groove Inside,

The shallow bottom of the inside tire shoulder cutter groove is set to the tire axial of the deep bottom of the inside tire shoulder cutter groove Outside.