CN104768774A

CN104768774A - Pneumatic tire

Info

Publication number: CN104768774A
Application number: CN201380057588.8A
Authority: CN
Inventors: 永吉胜智
Original assignee: Yokohama Rubber Co Ltd
Current assignee: Yokohama Rubber Co Ltd
Priority date: 2012-11-07
Filing date: 2013-09-27
Publication date: 2015-07-08
Anticipated expiration: 2033-09-27
Also published as: JP5942795B2; WO2014073286A1; JP2014094601A; CN104768774B

Abstract

This pneumatic tire (1) is provided with at least four circumferential main grooves (21, 22) extending in a tire circumferential direction, and a plurality of land portions (31-33) formed by being demarcated by the circumferential main grooves (21, 22). The pneumatic tire is further provided with a first lug groove (41) penetrating the center land portion (31) in a tire width direction, a circumferential narrow groove (23) disposed in the shoulder land portion (33) and extending in the tire circumferential direction, a second lug groove (43) extending inward from the circumferential narrow groove (23) in the tire width direction and open to the outermost circumferential main groove (22), and a third lug groove (44) extending outward from the circumferential narrow groove (23) in the tire width direction, open to a tread end, and disposed to be positionally displaced from the second lug groove (43) in the tire circumferential direction. The first lug groove (41) has a bent shape and is open with a see-through structure to the right and left circumferential main grooves (21, 22) that demarcate the center land portion (31).

Description

Air-inflation tyre

Technical field

The present invention relates to a kind of air-inflation tyre, more specifically, relate to and a kind ofly improve the performance on ice of tire and the air-inflation tyre of snow performance.

Background technology

Use in studless tire at pickup truck, also exist and be intended to improve the performance on ice of tire and the problem of snow performance, have employed the traction decorative pattern with multiple pattern block row at present, the plurality of pattern block row have groove.As the conventional pneumatic relevant to this problem, there will be a known the technology that patent documentation 1 is recorded.

In addition, there will be a known the technology described in patent documentation 2, although be for the tire for heavy load use in truck, city motor bus etc., this air-inflation tyre has the tread contour approximate with the present application.

Prior art document

Patent documentation

[patent documentation 1] Japanese Patent Laid-Open 2004-26158 publication

[patent documentation 2] Japanese Patent Laid-Open 2011-31885 publication

Summary of the invention

The problem that invention quasi-solution is determined

The object of the present invention is to provide and a kind ofly improve the performance on ice of tire and the air-inflation tyre of snow performance.

For reaching above-mentioned purpose, air-inflation tyre involved in the present invention, it has at least 4 the circumferential major troughs extended to tire circumference and the multiple land portion divided by described circumferential major trough, it is characterized in that, be called that most peripheral is to major trough the described circumferential major trough in the outermost left and right of tire width direction will be positioned at, the described land portion that more described most peripheral is positioned at inside closer to tire width direction to major trough is called central land portion, when more described most peripheral being called tire-shoulder land portion to the major trough described land portion be positioned at outside closer to tire width direction simultaneously, it has: the first band groove, it is through described central land portion on tire width direction, circumference stria, it is configured in described tire-shoulder land portion, and extends to tire circumference, second band groove, it extends inside tire width direction from described circumferential stria, and at described most peripheral to major trough opening, and the 3rd band groove, it extends outside tire width direction from described circumferential stria, at tyre surface end opening, and be configured to relative to described second band groove, staggered positions in tire circumference, and described first band groove has meander-shaped, simultaneously with the left and right described circumferential major trough opening of perspective structure relative to the described central land portion of division.

Invention effect

According to air-inflation tyre involved in the present invention, the first band groove has perspective structure, can improve the performance on ice of tire and the advantage of snow performance so have.

Accompanying drawing explanation

Fig. 1 is the section-drawing that airtyred tyre equatorial direction described in the embodiment of the present invention is shown.

Fig. 2 is the planar view of the airtyred fetus face illustrated described in Fig. 1.

Fig. 3 is the enlarged drawing in the central land portion of the tread contour illustrated described in Fig. 2.

Fig. 4 is the enlarged drawing in the tire-shoulder land portion of the tread contour illustrated described in Fig. 2.

Fig. 5 is the instruction diagram of the example that three-dimensional groove is shown.

Fig. 6 is the instruction diagram of the example that three-dimensional groove is shown.

Fig. 7 is the chart that airtyred performance test results described in the embodiment of the present invention is shown.

Fig. 8 is the airtyred instruction diagram that conventional example is shown.

Fig. 9 is the airtyred instruction diagram that comparative example is shown.

Detailed description of the invention

Describe the present invention in detail with reference to the accompanying drawings.In addition, the present invention is not limited to the present embodiment.In addition, in the inscape of the present embodiment, containing while the homogeneity maintaining invention, can replace and the content of easily displacement.In addition, the multiple modification recorded in the present embodiment, combination in any in the scope that energy those skilled in the art can realize.

Air-inflation tyre

Fig. 1 is the section-drawing that airtyred tyre equatorial direction described in the embodiment of the present invention is shown.The figure illustrates the single side regions of tire radial direction.In addition, this figure, as an airtyred example, shows pickup truck studless tire.In addition, in this figure, symbol CL is tire equator face.In addition, tire width direction refers to the direction parallel with tire rotation axle (omit and illustrate), and tire radial direction refers to the direction vertical with tire rotation axle.

This air-inflation tyre 1 has the atoll texture centered by tire rotation axle, possess pair of bead core 11,11, a pair bead-core 12,12, carcass plies 13, bracing ply 14, tread-rubber 15, pair of sidewalls glue 16,16 and a pair wheel rim protect glue 17,17 (with reference to Fig. 1).

The bead core 11,11 of a pair is the annular component become by multiple steel bead wire bundle, forms the core of left and right bead part.A pair bead-core 12,12 is configured at the tire outer radial periphery of pair of bead core 11,11 respectively, for strengthening bead part.

The circular frame of carcass plies 13, between left and right bead core 11,11, forms the skeleton of tire.In addition, the both ends of carcass plies 13 are fixing to rollback outside tire width direction, bead core 11 and bead-core 12 encased.In addition, carcass plies 13 covers by steel or organic fiber material (such as with coating cement, aramid fiber, nylon, poly-ester fibres, regenerated fiber etc.) multiple plies cords of forming being rolled processes, and having absolute value is be more than or equal to the cord angle (machine direction of plies cords is relative to the leaning angle of tire circumference) that 80deg is less than or equal to 95deg.

Bracing ply 14 is formed pair of cross band bundle 141,142 and band cap layer 143 lamination, is configured to the periphery being centered around carcass plies 13.Pair of cross band bundle 141,142 covers multiple belt cord of being made up of steel or organic fibrous material with coating cement and is rolled and processes, and has absolute value and is more than or equal to the belt angle that 20deg is less than or equal to 40deg.In addition, pair of cross band bundle 141,142 has the reciprocal belt angle of symbol (machine direction of belt cord is relative to the leaning angle of tire circumference), the machine direction making belt cord lamination (oblique structure) across mutually.Cover with coating cement multiple belt cord of being made up of steel or organic fiber material with cap layer 143 and rolling processing and being formed, there is absolute value and be more than or equal to the belt angle that 45deg is less than or equal to 70deg.In addition, cap layer 143 lamination is with to be configured in the tire radial outside of cross band bundle 141,142.

Tread-rubber 15 is configured at the tire outer radial periphery of carcass plies 13 and bracing ply 14, forms the fetus face of tire.Pair of sidewalls glue 16,16 is configured at outside the tire width direction of carcass plies 13 respectively, forms left and right sides wall portion.A pair wheel rim protects glue 17,17 and is configured in outside the tire width direction of left and right bead core 11,11 and bead-core 12,12 respectively, forms left and right bead part.

In addition, tread-rubber 15 preferably has and is more than or equal to the rubber hardness that 60 are less than or equal to 75, more preferably has and is more than or equal to the rubber hardness that 65 are less than or equal to 70.Rubber hardness refers to the JIS-A hardness according to JIS-K6263, measures under the condition of 20 DEG C.

[tread contour]

Fig. 2 is the planar view of the airtyred fetus face illustrated described in Fig. 1.Fig. 3 is the enlarged drawing in the central land portion of the tread contour illustrated described in Fig. 2.Fig. 4 is the enlarged drawing in the tire-shoulder land portion of the tread contour illustrated described in Fig. 2.In these figures, Fig. 2 illustrates the traction decorative pattern of studless tire.In addition, Fig. 3 illustrates the adjacent pattern block of a pair in the central land portion 31 on the CL of tire equator face.In addition, Fig. 4 illustrates one of them tire-shoulder land portion 33.In addition, in these figures, tire circumference refers to the direction that tire rotation axle rotates.In addition, symbol T refers to that tire contacts to earth end.

As shown in Figure 2, this air-inflation tyre 1 has at least 4 the circumferential major troughs 21,22 extended to tire circumference at fetus face, and the multiple land portion 31 ~ 33 divided by these circumferential major troughs 21,22.

Circumference major trough refers to that groove width is the circumferential slot of more than 5.0mm.The groove width of circumferential slot measures after except the notch be formed in the channel opening portion of tyre surface tread and chamfered section.

In addition, in this embodiment, be positioned at tire width direction outermost left and right circumference major trough 22,22 and be called that most peripheral is to major trough.In addition, the land portion 31,32 be positioned at inside closer to tire width direction to major trough 22,22 compared with left and right most peripheral is called central land portion.In addition, the land portion 33,33 be positioned at outside closer to tire width direction to major trough 22,22 compared with left and right most peripheral is called tire-shoulder land portion.

Such as, in the structure of Fig. 2,4 circumferential major troughs 21,22 are centered by the CL of tire equator face, in symmetric configuration.And, by these circumferential major troughs 21,22, mark off 3 row central land portions 31,32,32, and pair of right and left tire-shoulder land portion 33,33.

In addition, as shown in Figure 2, this air-inflation tyre 1 has multiple first band groove 41,42 in central land portion 31,32.

First band groove 41,42 is the major troughs extended to tire width direction, through central land portion 31,32 on tire width direction, and is dividing the left and right circumference major trough 21,22 in central land portion 31,32 respectively; 21,22 upper sheds.

In addition, band groove refers to that groove width is the translot of more than 1.0mm.The groove width of band groove measures after except the notch be formed in the channel opening portion of tyre surface tread and chamfered section.

Such as, in the structure of Fig. 2, multiple band groove 41,42 is configured in all central land portions 31,32 respectively, and opens appointed interval in tire circumference overhead when configuring.Therefore, each central land portion 31,32 is opened by multiple band groove 41,42 points in tire circumference, forms pattern block row.

In addition, as shown in Figure 3, the first band groove 41 (42) has meander-shaped, has zigzag part in the inside in central land portion 31 (32).Meander-shaped comprises such as V shape, W shape and zigzag fashion etc.Now, when the first band groove 41 (42) is for having the structure of meander-shaped, the marginal element in central land portion 31 (32) can increase, and considers, then preferably from the viewpoint of the traction property improving tire.

In addition, the first band groove 41 (42) carries out opening with perspective structure relative to left and right circumference major trough 21,22 (21,22) dividing central land portion 31 (32).Perspective structure refers to the structure can being seen another circumferential major trough 21 (22) by the first band groove 41 (42) from a circumferential major trough 21 (21).Therefore, for guaranteeing above-mentioned perspective structure, the curved shape of the first band groove 41 (42) can be restricted.According to described perspective structure, drainage and row's snow property of the first band groove 41 (42) can be improved, therefore preferably.

In addition, the zigzag part of the meander-shaped of the first band groove 41 (42) is configured in being more than or equal to of the width W 1 in central land portion 31 (32) and 40% is less than or equal in the region of 60%.That is, the zigzag part of the first band groove 41 (42) is configured in the region of the central portion 20% of the Width in central land portion 31 (32).In addition, the width W 1 in central land portion 31 (32) draws as the maximum width and measuring in whole land portion.

Such as, in the structure of Fig. 3, the first band groove 41 (42) has the stair-stepping curved shape with two zigzag parts, tilts, and extend to tire width direction with the tiltangleθ 1 specified.In addition, the zigzag part of the first band groove 41 (42) is configured on the line of centers in central land portion 31 (32).Further, the tiltangleθ 1, groove width W2, the distance S1 of adjacent zigzag part in tire circumference etc. of the first band groove 41 (42), through adjustment, ensure that the perspective structure of the first band groove 41 (42).

Now, the tiltangleθ 1 of the first band groove 41 (42) is preferably in the scope of 1deg≤θ 1≤30deg.In addition, the leaning angle of band groove measures as angle formed by the straight line of the center-point of the left and right peristome by band groove and tire width direction and draws.

In addition, the groove width W2 of the distance S1 of preferably adjacent zigzag part in tire circumference and the first band groove 41 (42) has the relation of 0.50≤S1/W2≤0.90, more preferably has the relation of 0.65≤S1/W2≤0.75.Therefore, the marginal element of the first band groove 41 (42) can be guaranteed, row's property avenged of the first band groove 41 (42) can also be guaranteed.

In addition, as shown in Figure 2 and Figure 4, this air-inflation tyre 1 has a circumferential stria 23, multiple second band groove 43 and multiple 3rd band groove 44 respectively in tire-shoulder land portion, left and right 33,33.

Circumference stria 23 is the strias extended to tire circumference, not to most peripheral to major trough 22 and tyre surface end opening, extends, tire-shoulder land portion 33 is divided into two by tire width direction in the inside in tire-shoulder land portion 33 to tire circumference.

Circumference stria refers to that groove width is the circumferential slot being more than or equal to 1.0mm and being less than the groove width of circumferential major trough.The groove width of stria as subtend trough wall surface between distance and measuring draw.Therefore, about the groove with the amplitude such as wave shape, zigzag fashion, no matter its amplitude, all measure its groove width, determine whether circumferential stria.

Such as, in the structure of Fig. 2, tire-shoulder land portion, left and right 33,33 has 1 circumferential stria 23 respectively.In addition, as shown in Figure 4, circumferential stria 23 has the zigzag fashion containing linear component.Therefore, when circumferential stria 23 is blocked in tire contacts to earth process, by making circumferential stria 23 engage with the cell wall of subtend, thus guarantee the rigidity in tire-shoulder land portion 33.But be not limited thereto, circumferential stria 23 also can have wave shape (omitting diagram).

In addition, in the structure of Fig. 2, the maxim α max of the bend angles alpha of the zigzag fashion of circumferential stria 23 is preferably in the scope of 1deg≤α max≤30deg, is more preferably in the scope of 5deg≤α max≤25deg.

Bend angles alpha to measure for benchmark with the groove center line of circumferential stria 23 and draws.In addition, circumferential stria 23 has in the structure of wave shape, and its angle formed as the dummy line connecting adjacent flex point and measuring draws.

In addition, in the structure of Fig. 2, the maximum groove depth Hs of preferred circumferential stria 23 and most peripheral have the relation of 0.40≤Hs/H≤0.80 to the maximum groove depth H of major trough 22, more preferably have the relation of 0.50≤Hs/H≤0.80.Groove depth be except the top, the end by the otch in channel opening portion and bottom land after measure and draw.

In addition, preferably from tire equatorial plane CL to the distance Ls of circumferential stria 23 and the relation of holding the distance L of T to have 0.70≤Ls/L≤0.90 of contacting to earth from tire equatorial plane CL to tire.

The tire end T that contacts to earth refers to tire is installed on regulation wheel rim, gives pressure in regulation, and is vertically positioned on flat board with quiescence, when applying to be equivalent to the load of prescribed load, and the maximum width position of tire axial in tire and dull and stereotyped contact surface.

Here, regulation wheel rim refers to, " the Measuring Rim " that specify in " the Design Rim " that specify in " being suitable for wheel rim " of specifying in JATMA, TRA or ETRTO.In addition, in regulation, pressure refers to " the INFLATION PRESSURES " that specify in " most anticyclonic pressure " that specify in JATMA, " the TIRELOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES " maxim specified in TRA or ETRTO.Further, prescribed load refers to " the LOAD CAPACITY " that specify in " maximum load capability " that specify in JATMA, " the TIRELOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES " maxim specified in TRA or ETRTO.But in JATMA, in the regulation of passenger vehicle tyre, pressure is 180kPa air pressure, and prescribed load is 88% of maximum load capability.

Second band groove 43 extends inside tire width direction from circumferential stria 23, and at the major trough (with reference to Fig. 2 and Fig. 4) of most peripheral to major trough 22 upper shed.That is, the second band groove 43 is configured in the region inside the tire width direction in the tire-shoulder land portion 33 be divided into two by circumferential stria 23, and it extends inside tire width direction, and at most peripheral to major trough 22 and circumferential stria 23 upper shed.In addition, multiple second band groove 43 is configured in tire circumference with appointed interval.Therefore, the region inside the tire width direction in tire-shoulder land portion 33 is separated in tire circumference, forms pattern block row.

3rd band groove 44 extends outside tire width direction from circumferential stria 23, and at the major trough (with reference to Fig. 2 and Fig. 4) of tyre surface end opening.That is, the 3rd band groove 44 is configured in the region outside the tire width direction in the tire-shoulder land portion 33 be divided into two by circumferential stria 23, and it extends inside tire width direction, and at most peripheral to major trough 22 and tyre surface end opening.In addition, multiple 3rd band groove 44 is configured in tire circumference with appointed interval.Therefore, the region outside the tire width direction in tire-shoulder land portion 33 is separated in tire circumference, forms pattern block row.

Tyre surface end refers to and tire is installed on regulation wheel rim, give in regulation press and make it be in no load condition time tire the both ends of tread contour part.

Herein, as shown in Figure 4, the 3rd band groove 44 configures relative to the second band groove 43 staggered positions in tire circumference.Therefore, the 3rd band groove 44 is positioned at the position of the extended line departing from the second band groove 43, the peristome of the 3rd band groove 44 and the peristome of the second band groove 43 in tire circumference, relative to circumferential stria 23 offset configuration.

Such as, in the structure of Fig. 4, as mentioned above, circumferential stria 23 extends to tire circumference indentation, and is divided into two in tire-shoulder land portion 33 on tire width direction.In addition, the 3rd band groove 44 and the second band groove 43, in the region, left and right in the tire-shoulder land portion 33 being border with circumferential stria 23, alternately configure to tire circumference.Therefore, region, left and right alternate segments in tire circumference in tire-shoulder land portion 33, tire-shoulder land portion 33 for border with circumferential stria 23, tire circumference becomes and is arranged in jagged pattern block row.In addition, the 3rd band groove 44 is communicated to the curve protruded inside the tire width direction of circumferential stria 23, and the second band groove 43 is communicated to the curve protruded outside the tire width direction of circumferential stria 23.Therefore, the left and right pattern block row in tire-shoulder land portion 33 have the edge part protruded to circumferential stria 23 side.

In addition, the second band groove 43 tilts to tire width direction with the tiltangleθ 2 of regulation.In addition, adjacent land portion 31,32; 32, each band groove 41 ~ 43 of 33 tilts with the tiltangleθ 1 of distinct symbols, θ 2, and in the configuration of tire circumference staggered positions.

Now, preferably the tiltangleθ 2 of the second band groove 43 in the scope of 1deg≤θ 2≤30deg.In addition, preferably the tiltangleθ 2 of the second band groove 43 is relative to the tiltangleθ 1 of the first band groove 41 (42) described in Fig. 3, has the relation of θ 2≤θ 1.Therefore, in the structure of Fig. 2, the tiltangleθ 1 of the first band groove 41,42 being positioned at central land portion 31,32 is set to comparatively large, the tiltangleθ 2 of the second band groove 43 being positioned at tire-shoulder land portion 33 is set to less.Therefore, it is possible to maintain the resistance to partial wear of tire, and improve performance and snow performance on ice.

In addition, in the formation of Fig. 2, as mentioned above, central land portion 31,32 and tire-shoulder land portion 33 are that the pattern block divided by circumferential major trough 21,22, first band groove 41,42, second band groove 43 and the 3rd band groove 44 arranges.And when tyre surface is looked squarely, these pattern blocks row are configured to centered by the point on the CL of tire equator face in point symmetry.In order to improve comfort feature during interchanging of tires, preferably there is described point symmetry decorative pattern.

In addition, in the structure of Fig. 2, at circumferential major trough 21 (22) with on the crossover location of the first band groove 41 (42), the edge part in each land portion 31 (32,33) has the order difference part (with reference to Fig. 2) to tire width direction skew.Specifically, the edge part of circumferential major trough 21 (22) side of the pattern block in each land portion 31 (32,33) has the order difference part in the enterprising row order scalariform change of tire width direction respectively.In addition, edge part staggered positions on tire width direction of pattern block adjacent in tire circumference, is configured in the peristome of the first band groove 41 (42).Therefore, circumferential major trough 21 (22) bends to stepped on tire width direction, and extends with roughly the same groove width in tire circumference.Therefore, being distracted into branch increases, and can improve performance on ice and the snow performance of tire.

In addition, in this air-inflation tyre 1, as shown in Figure 2 to 4, the pattern block in each land portion 31 ~ 33 has multiple groove 5 respectively.Therefore, it is possible to strengthen the marginal element of pattern block, improve the tractive property as studless tire.

Groove refers to the grooving with the groove width being less than 1.0mm.In addition, groove can be the planar trenches of the groove wall in the section-drawing vertical with trench length direction with rectilinear form, also can be in the section-drawing vertical with trench length direction, have the three-dimensional groove that shape is the groove wall bent to groove width direction.Three-dimensional groove is compared with two-dimensional groove, and between groove wall in opposite directions, snap-in force is comparatively strong, therefore has the effect strengthening land portion rigidity.Therefore, preferred at least one row pattern block row have three-dimensional groove, and more preferably all pattern blocks all have three-dimensional groove.As this three-dimensional groove, include, for example following decorative pattern.

Fig. 5 and Fig. 6 is the instruction diagram of the example that three-dimensional groove is shown.The figures illustrate the groove wall of three-dimensional groove.

In the three-dimensional groove of Fig. 5, trench wall mask has the structure connecting pyrometric cone and inverted triangle cone on trench length direction.In other words, trench wall mask has the zigzag fashion of the zigzag fashion of tyre surface side and side, bottom to stagger mutually on tire width direction zigzag fashion in opposite directions concavo-convex each other of spacing, this tyre surface side and side, bottom surface.In addition, groove wall is by these are concavo-convex, on concavo-convex when seeing towards tire rotation direction, connect two the convex bending points adjoined each other in the convex bending point of the convex bending point of tyre surface side and the recessed point of inflection of side, bottom, the recessed point of inflection of tyre surface side and the convex bending point of side, bottom and the convex bending point of tyre surface side and side, bottom respectively with crest line, and successively these crest lines are formed by connecting along tire width direction plane.And, the trench wall mask of side has bores male and fomale(M&F) in arrayed interaction on tire width direction by convex pyrometric cone and inverted triangle, and the trench wall mask of opposite side has bores male and fomale(M&F) in arrayed interaction on tire width direction by concavity pyrometric cone and inverted triangle.And groove wall at least allows and is configured in the outside of the outermost male and fomale(M&F) in groove two ends towards pattern block.In addition, about this three-dimensional groove, there will be a known such as technology disclosed in Japanese Patent No. 3894743 publication.

In addition, in the three-dimensional groove of Fig. 6, trench wall mask has the multiple prisms making to have pattern block shape to tilt relative to gash depth direction, and the structure on gash depth direction and trench length direction, prism linked.In other words, groove wall has zigzag fashion at tyre surface.In addition, groove wall is inner in pattern block, more than two places in tire radial direction has along tire circumferential skewing and the curve be connected in tire width direction, and has the zigzag fashion in tire radial direction with amplitude at this curve.Further, groove wall makes the amplitude in tire circumference fix on the one hand, and trench bottom side is compared with tyre surface side on the other hand, and less towards the angle of tire peripheral, oblique relative to tyre surface normal direction, the amplitude of the tire radial direction of curve is then larger.In addition, about this three-dimensional groove, there will be a known such as technology disclosed in Japanese Patent No. 4316452 publication.

[effect]

As mentioned above, this air-inflation tyre 1 possesses at least four the circumferential major troughs 21,22 extended to tire circumference, and the multiple land portion 31 ~ 33 (with reference to Fig. 2) divided by these circumferential major troughs 21,22.In addition, also possess: the first band groove 41 (42), it is through central land portion 31 (32) on tire width direction; Circumference stria 23, it is configured in tire-shoulder land portion 33, and extends to tire circumference; Second band groove 43, it extends inside tire width direction from circumferential stria 23, and at most peripheral to major trough 22 upper shed; And the 3rd band groove 44, it extends outside tire width direction from circumferential stria 23, at tyre surface end opening, and relative to the second band groove 43 staggered positions configuration in tire circumference.In addition, the first band groove 41 (42) has meander-shaped, and carries out opening with perspective structure relative to left and right circumference major trough 21,22 (21,22) dividing central land portion 31 (32).

In this structure, the 3rd band groove 44 in (1) tire-shoulder land portion 33 configures, therefore, it is possible to suitably guarantee the rigidity in tire-shoulder land portion 33 relative to the second band groove 43 staggered positions in tire circumference.Thus, air-inflation tyre of the present invention has the advantage can improving resistance to partial wear performance.

In addition, (2) circumferential stria 23 is configured in when turn inside diameter travels and is subject to larger contacting to earth in the tire-shoulder land portion 33 of pressure, therefore has the traction composition increased to tire width direction, improves the advantage of the turning performance of tire.In addition, compared with replacing the structure of circumferential stria 23 (omit and illustrate) with configuration trench, in snow, shearing force can increase along with the long-pending increase of the cell body in tire-shoulder land portion 33, therefore has and can improve the performance on ice of tire and the advantage of snow performance.

In addition, (3) first band grooves 41 (42) have meander-shaped, because this increasing the marginal element on tire circumference and tire width direction, having and can improve the performance on ice of tire and the advantage of snow performance.In addition, also have and can suppress collapsing of pattern block, improve the advantage of the resistance to partial wear performance of tire.

In addition, (4) first band grooves 41 (42) have perspective structure, therefore have and can improve the performance on ice of tire and the advantage of snow performance.

In addition, in this air-inflation tyre 1, the zigzag part of the first band groove 41 (42) is configured in being more than or equal to of the width W 1 in central land portion 31 (32) and 40% is less than or equal to (with reference to Fig. 3) in the region of 60%.In this structure, the zigzag part of the first band groove 41 (42) is configured in the central portion in central land portion 31 (32), therefore has and can suppress collapsing of pattern block, improves the advantage of the resistance to partial wear performance of tire.

In addition, in this air-inflation tyre 1, the first band groove 41 (42) has multiple zigzag part (with reference to Fig. 3).In addition, the groove width W2 of the distance S1 of adjacent zigzag part in tire circumference and the first band groove 41 (42) has the relation of 0.50≤S1/W2≤0.90.In this way, there is the advantage of the distance S1 optimizing adjacent zigzag part.That is, by arranging 0.50≤S1/W2, the marginal element of band groove 41 (42) can suitably be guaranteed.In addition, by arranging S1/W2≤0.90, row's property avenged of curve can suitably be guaranteed.

In addition, in this air-inflation tyre 1, circumferential stria 23 has multiple curve (with reference to Fig. 4).In this way, add the marginal element in tire-shoulder land portion 33, have and can improve the performance on ice of tire and the advantage of snow performance.

In addition, in this air-inflation tyre 1, the bend angles alpha (with reference to Fig. 4) in the scope of 1deg≤α≤30deg of the curve of circumferential stria 23.Therefore, there is the advantage of the bend angles alpha optimizing circumferential stria 23.That is, due to 1deg≤α max, so obtain the effect increasing marginal element by curve, in addition, due to α max≤30deg, so row's property avenged of circumferential stria 23 can be guaranteed.

In addition, in this air-inflation tyre 1, the maximum groove depth Hs of circumferential stria 23 and most peripheral have the relation of 0.40≤Hs/H≤0.80 to the maximum groove depth H of major trough 22.In this way, there is the advantage of the maximum groove depth Hs optimizing circumferential stria 23.That is, by arranging 0.40≤Hs/H, shearing force in snow can being guaranteed by circumferential stria 23, by arranging Hs/H≤0.80, can suitably guaranteeing the effect of circumferential stria 23 in tire wear latter stage.

In addition, in this air-inflation tyre 1, from tire equatorial plane CL to the distance Ls of circumferential stria 23 and the relation (with reference to Fig. 2) of holding the distance L of T to have 0.70≤Ls/L≤0.90 of contacting to earth from tire equatorial plane CL to tire.In this way, there is the advantage of the position of the tire width direction optimizing circumferential stria 23.Such as, by setting the configuration of circumferential stria 23 as mentioned above, in vehicle zero load tire contact to earth scope less time, also circumferential stria 23 can be configured in tread surface.In this way, no matter have the cargo-loading conditions of vehicle, the advantage of the function of circumferential stria 23 suitably can both be guaranteed.

In addition, in this air-inflation tyre 1, the first band groove 41 (42) meets 1deg≤θ 1≤30deg, 1deg≤θ 2≤30deg and the necessary condition of θ 2≤θ 1 (with reference to Fig. 3 and Fig. 4) relative to the tiltangleθ 1 of tire width direction and the second band groove 43 relative to the tiltangleθ 2 of tire width direction.Therefore, there is tiltangleθ 1 that optimization is positioned at the first band groove 41 (42) in central land portion 31 (32) and the advantage of relation of tiltangleθ 2 of the second band groove 43 being positioned at tire-shoulder land portion 33.That is, can, by arranging 1deg≤θ 1 and 1deg≤θ 2, band groove 41 ~ 43 be tilted, thus improve to the drainage of tire width direction and row's property avenged on freezing road surface.In addition, by arranging θ 1≤30deg and θ 2≤30deg, the marginal element of band groove 41 ~ 43 to tire circumference can be guaranteed, guaranteeing traction property when braking, the resistance to partial wear performance under the usage condition loitered can also be guaranteed.In addition, by arranging θ 2≤θ 1, resistance to partial wear performance can be maintained and improves ice and snow performance.

In addition, in this air-inflation tyre 1, at circumferential major trough 21 (22) with on the crossover location of the first band groove 41 (42), the edge part in each land portion 31 (32,33) has the order difference part (with reference to Fig. 2) to tire width direction skew.Therefore, add traction composition, have and can improve the performance on ice of tire and the advantage of snow performance.

In addition, in this air-inflation tyre 1, at circumferential major trough 21 (22) with on the crossover location of the first band groove 41 (42), edge part staggered positions on tire width direction of pattern block adjacent in tire circumference, is configured in the peristome (with reference to Fig. 2) of the first band groove 41 (42).In this way, add traction composition, have and can improve the performance on ice of tire and the advantage of snow performance.

In addition, in this air-inflation tyre 1, land portion 31 ~ 33 has multiple three-dimensional groove 5 (with reference to Fig. 2 and Fig. 3).In this way, there is the advantage of the rigidity can improving land portion 31 ~ 33.Such as, three-dimensional groove 5 can be had by making central land portion 31,32, improving the driving stability performance of tire, and three-dimensional groove 5 can be had by making tire-shoulder land portion 33, improve the resistance to partial wear performance of tire.

In addition, in this air-inflation tyre 1, tread-rubber 15 has and is more than or equal to the rubber hardness that 60 are less than or equal to 75.In this way, there is the advantage suitably can guaranteeing the rigidity of fetus face.[applicable object]

In addition, this air-inflation tyre 1 is preferably be more than or equal to 350kPa to be less than or equal to small card tire for vehicles in the scope of 600kPa as applicable object using the most anticyclonic pressure of JATMA regulation.Small card tire for vehicles is mainly used in local traveling, and therefore middle section easily occurs to wear away in advance because repeatedly implementing to loiter.At this on the one hand, in this air-inflation tyre 1, circumferential stria 23 is configured in tire-shoulder land portion 33, therefore with by circumferential slot arrangement compared with the structure (omit and illustrate) in central land portion, the rigidity of fetus face middle section can be guaranteed.In this way, have can improve tire repeatedly walk to stop performance, and can suppress middle section that the advantage worn away in advance occurs.Embodiment

Fig. 7 is the chart of the airtyred performance test results that example of the present invention is shown.Fig. 8 is the airtyred instruction diagram that conventional example is shown.Fig. 9 is the airtyred instruction diagram that comparative example is shown.

In this performance test, to multiple mutually different air-inflation tyre, carry out the evaluation (with reference to Fig. 7) about (1) resistance to partial wear performance and (2) ice and snow performance (on ice performance and snow performance).In this performance test, the air-inflation tyre (pickup truck studless tire) of tire size 205/85R16117/115L is assembled on the applicable wheel rim of JATMA regulation, and applies most anticyclonic pressure and the maximum load of JATMA regulation to this air-inflation tyre.In addition, air-inflation tyre is arranged on test vehicle i.e. all of 3 tons of trucks to take turns.

(1), in the evaluation about resistance to partial wear performance, test vehicle travels with average velociity 60km/h mats formation on road at 50,000 km, observes the partial wear produced on the pattern block in each land portion.Then, based on this observations, with conventional example for benchmark (100), carry out index assessment.This numerical value is more large more preferred.

(2), in the evaluation about ice and snow performance, test vehicle travels on the test road with ice road surface and snow road surface, and test driver is to braking ability, startability, rectilinear propagation and curvingly carry out comprehensive sensory evaluation.This evaluation is undertaken by the index assessment being benchmark (100) with conventional example, and its numerical value is more preferred more greatly.

The air-inflation tyre 1 of embodiment 1 has the structure described in Fig. 1 ~ Fig. 4.The air-inflation tyre 1 of embodiment 2 ~ 13 is modification of the air-inflation tyre 1 of embodiment 1.In addition, from tire equatorial plane CL to contact to earth end T distance L be L=80mm.In addition, most peripheral is H=13.5mm to the maximum groove depth H of major trough 22.

The air-inflation tyre of conventional example has the structure shown in Fig. 8.The air-inflation tyre of comparative example has the structure shown in Fig. 9.

As shown in test results, can find out that in the air-inflation tyre 1 of embodiment 1 ~ 13, resistance to partial wear performance, on ice performance and the snow performance of tire is improved.

Nomenclature

1: air-inflation tyre

5: three-dimensional groove

11: bead core

12: bead-core

13: carcass plies

14: bracing ply

15: tread-rubber

16: sidewall glue

17: wheel rim protects glue

21: circumferential major trough

22: most peripheral is to major trough

23: circumferential stria

31,32: central land portion

33: tire-shoulder land portion

41,42: the first band grooves

43: the second band grooves

44: the three band grooves

141,142: cross band bundle

143: band cap layer

Claims

1. an air-inflation tyre, it has at least 4 the circumferential major troughs extended to tire circumference and the multiple land portion divided by described circumferential major trough, it is characterized in that,

Described for the outermost left and right being positioned at tire width direction circumferential major trough is being called that most peripheral is to major trough, the described land portion that more described most peripheral is positioned at inside closer to tire width direction to major trough is called central land portion, when more described most peripheral being called tire-shoulder land portion to the major trough described land portion be positioned at outside closer to tire width direction simultaneously

It has: the first band groove, and it is through described central land portion on tire width direction;

Circumference stria, it is configured in described tire-shoulder land portion, and extends to tire circumference;

Second band groove, it extends inside tire width direction from described circumferential stria, and at described most peripheral to major trough opening; And

3rd band groove, it extends outside tire width direction from described circumferential stria, at tyre surface end opening, and is configured to relative to described second band groove, staggered positions in tire circumference, and

Described first band groove has meander-shaped, simultaneously with perspective structure relative to the described circumferential major trough opening divided about described central land portion.

2. air-inflation tyre according to claim 1, is characterized in that, the zigzag part of described first band groove is configured in being more than or equal to of the width W 1 in described central land portion and 40% is less than or equal in the region of 60%.

3. air-inflation tyre according to claim 1 and 2, is characterized in that, described first band groove has multiple zigzag part, and

The groove width W2 of the distance S1 of adjacent described zigzag part in tire circumference and described first band groove has the relation of 0.50≤S1/W2≤0.90.

4. air-inflation tyre according to any one of claim 1 to 3, is characterized in that, described circumferential stria has multiple curve.

5. air-inflation tyre according to claim 4, is characterized in that, the maxim α max of the bend angles alpha of the curve of described circumferential stria is in the scope of 1deg≤α max≤30deg.

6. air-inflation tyre according to any one of claim 1 to 5, is characterized in that, the maximum groove depth Hs of described circumferential stria and the maximum groove depth H of described circumferential major trough has the relation of 0.40≤Hs/H≤0.80.

7. air-inflation tyre according to any one of claim 1 to 6, is characterized in that, has the relation of 0.70≤Ls/L≤0.90 from the tire equatorial plane to the distance Ls of described circumferential stria and the distance L that holds of contacting to earth from the tire equatorial plane to tire.

8. air-inflation tyre according to any one of claim 1 to 7, it is characterized in that, described first band groove meets the necessary condition of 1deg≤θ 1≤30deg, 1deg≤θ 2≤30deg and θ 2≤θ 1 relative to the tiltangleθ 2 of tire width direction relative to tiltangleθ 1 and the described second band groove of tire width direction.

9. air-inflation tyre according to any one of claim 1 to 8, is characterized in that, on the crossover location of described circumferential major trough and described first band groove, the edge part in described land portion has the order difference part to tire width direction skew.

10. air-inflation tyre according to any one of claim 1 to 9, it is characterized in that, on the crossover location of described circumferential major trough and described first band groove, edge part staggered positions on tire width direction of the pattern block in described land portion adjacent in tire circumference, is configured in the peristome of described first band groove.

11. air-inflation tyres according to any one of claim 1 to 10, is characterized in that, described land portion has multiple three-dimensional groove.

12. air-inflation tyres according to any one of claim 1 to 11, is characterized in that, tread-rubber has and is more than or equal to the rubber hardness that 60 are less than or equal to 75.

13. air-inflation tyres according to any one of claim 1 to 12, it is using the small card tire for vehicles in the most anticyclonic pressure of the JATMA regulation scope that is more than 350kPa below 600kPa as applicable object.