CN102398485B - Band tire - Google Patents
Band tire Download PDFInfo
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- CN102398485B CN102398485B CN201110276881.6A CN201110276881A CN102398485B CN 102398485 B CN102398485 B CN 102398485B CN 201110276881 A CN201110276881 A CN 201110276881A CN 102398485 B CN102398485 B CN 102398485B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0344—Circumferential grooves provided at the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0346—Circumferential grooves with zigzag shape
Abstract
The invention discloses a kind of band tire, the reduction of wear-out life can be suppressed to Min., and suppress the generation of horsestone.Have zig-zag tap drain at fetus face, the salient angle lateral bend point that furrow bank protrudes to ditch width central side by the furrow bank of these zig-zag tap drain both sides respectively and furrow bank extend to the recessed re-entrant angle lateral bend point alternate repetition of ditch width central side with zig-zag.Zig-zag tap drain comprises the interior zig-zag tap drain of side, tire equator face, and be provided with at the salient angle lateral bend comprising salient angle lateral bend point on the furrow bank of its both sides, with inclined-plane, the corner part that furrow bank is crossing with tyre surface tread cut away formed conical surface portion, salient angle side, and be provided with at the re-entrant angle lateral bend comprising above-mentioned re-entrant angle lateral bend point, with inclined-plane, the corner part that furrow bank is crossing with tyre surface tread cut away formed conical surface portion, re-entrant angle side.The tire circumferential lengths (La) in conical surface portion, salient angle side is different from the tire circumferential lengths (Lb) in conical surface portion, re-entrant angle side.
Description
Technical field
The present invention relates to a kind of band tire, particularly relate to the band tire improving resistance to horsestone performance.
Background technology
In recent years, with the normalisation of road net, the development of vehicle high performance, the band tire that truck, passenger vehicle etc. use uses following tire mostly, namely, be used in fetus face to be provided with the strip decorative pattern of many circumferential tap drains extended along tire circumference and to improve performance of running at high speed, and above-mentioned circumferential tap drain adopts zig-zag ditch to improve traction property and braking ability.
But, when utilizing this band tire to travel on the non-paving roads such as granular-type road, easily in above-mentioned circumferential tap drain, producing horsestone, and if make tire running under the state producing this horsestone, then likely damaging bottom of trench and causing tyre damage.Especially above-mentioned horsestone easily produces in the circumferential tap drain of the higher side, tire equator face of earth contact pressure, and there is the tendency that easily jagged sweep produces in zig-zag ditch.
In the past, as the technology suppressing such horsestone, be known to following technology, namely, such as shown in Figure 10, the furrow bank b of circumferential tap drain a both sides is made respectively the two rank taper ditches formed by ditch downside wall portion b1 and tread sidewall portion b2, wherein, ditch downside wall portion b1 extends from bottom of trench c with steep dip slope, and tread sidewall portion b2 extends to tyre surface tread Ts (such as with reference to patent documentation 1,2) from this ditch downside wall portion b1 with flat pitch rate.
But when two such rank taper ditch, the rubber volume due to fetus face decreases the amount of the semi-steep part of tread sidewall portion b2, so the wear-out life that there is tire shortens such problem.In addition, particularly in order to suppress the horsestone in the sweep of zig-zag ditch, and must above-mentioned tread sidewall portion b2 be set comparatively large such as more than 40 ° relative to the angle θ of the normal of tyre surface tread Ts, but in this case, rubber volume can be caused further to reduce, so the reduction of wear-out life becomes larger problem.
Patent documentation 1: Japanese Unexamined Patent Publication 2003-54219 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2008-296795 publication
Summary of the invention
Therefore the object of the present invention is to provide a kind of band tire, so that the reduction of the wear-out life caused by tread-rubber volume is suppressed to Min., and can effectively suppress circumferential tap drain to adopt the problem producing horsestone during zig-zag ditch.
In order to solve above-mentioned problem, the invention of the technical scheme 1 of the application, have the zig-zag tap drain extended along tire circumference with zig-zag at fetus face, the feature of this band tire is,
The salient angle lateral bend point that furrow bank protrudes to ditch width central side by the furrow bank of the both sides of above-mentioned zig-zag tap drain respectively and furrow bank alternately extend with zig-zag repeatedly to the re-entrant angle lateral bend point that ditch width central side is recessed, and it is right that the re-entrant angle lateral bend point of the furrow bank of the salient angle lateral bend point of the furrow bank of a side and the opposing party is formed opposed to each other
Above-mentioned zig-zag tap drain comprises and is configured on tire equator face or the interior zig-zag tap drain of the both sides in tire equator face, and
This interior zig-zag tap drain, the furrow bank of both sides is provided with conical surface portion, salient angle side at the salient angle lateral bend comprising above-mentioned salient angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, salient angle side, and be provided with conical surface portion, re-entrant angle side at the re-entrant angle lateral bend comprising above-mentioned re-entrant angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, re-entrant angle side, and
The tire circumferential lengths La in conical surface portion, above-mentioned salient angle side is different from the tire circumferential lengths Lb in conical surface portion, above-mentioned re-entrant angle side.
In addition, the invention of technical scheme 2, is characterized in that, the tire circumferential lengths La in conical surface portion, above-mentioned salient angle side is less than the tire circumferential lengths Lb in conical surface portion, above-mentioned re-entrant angle side.
In addition, the invention of technical scheme 3, it is characterized in that, the tapering depth H from tyre surface tread in conical surface portion, above-mentioned salient angle side is maximum in the position of the point of inflection of above-mentioned salient angle side, and this tapering depth H is left along with the point of inflection from above-mentioned salient angle side and reduces gradually.
In addition, the invention of technical scheme 4, is characterized in that, above-mentioned fetus face has the tire sipe extended from the above-mentioned salient angle lateral bend point of the furrow bank of both sides.
In addition, the invention of technical scheme 5, is characterized in that, above-mentioned zig-zag tap drain comprises outer zig-zag tap drain outside the tire axial of above-mentioned interior zig-zag tap drain,
This outer zig-zag tap drain, the furrow bank of a side is provided with conical surface portion, salient angle side at the salient angle lateral bend comprising above-mentioned salient angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, salient angle side, and be provided with conical surface portion, re-entrant angle side at the re-entrant angle lateral bend comprising above-mentioned re-entrant angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, re-entrant angle side, and
On the furrow bank of the opposing party, be provided with conical surface portion, salient angle side at salient angle lateral bend, and conical surface portion, re-entrant angle side is not set at re-entrant angle lateral bend.
In addition, the invention of technical scheme 6, is characterized in that, the furrow bank of above-mentioned the opposing party of above-mentioned outer zig-zag tap drain is configured in inside tire axial.
In addition, the invention of technical scheme 7, it is characterized in that, above-mentioned fetus face has otch on the furrow bank of above-mentioned the opposing party, this otch from re-entrant angle lateral bend point and and the straight line ditch portion of both sides that extends between the adjacent salient angle lateral bend point in tire circumference both sides of this re-entrant angle lateral bend point the straight line ditch portion of a side extend.
In addition, the invention of technical scheme 8, it is characterized in that, the furrow bank of the both sides of above-mentioned interior zig-zag tap drain comprises ditch downside wall portion and tread sidewall portion, wherein, above-mentioned ditch downside wall portion extends to the position of 20 ~ 50% of trench depth DA from bottom of trench, above-mentioned tread sidewall portion is connected with this ditch downside wall portion and relative to large than this ditch downside wall portion of the angle of the normal of tyre surface tread.
The present invention is described above, the most easily producing in horsestone in zig-zag tap drain, the salient angle lateral bend of the furrow bank in its both sides and re-entrant angle lateral bend, arrange conical surface portion, salient angle side and the conical surface portion, re-entrant angle side of with inclined-plane, the corner part that furrow bank is crossing with tyre surface tread being cut into chamfering shape.Therefore, it is possible to the reduction of the tread-rubber volume caused by being formed of conical surface portion is suppressed to Min., and the problem significantly at sweep horsestone in zig-zag tap drain can be suppressed.
In addition, the conical surface portion, re-entrant angle side of the conical surface portion, salient angle side of the furrow bank of the side in the furrow bank of both sides and the furrow bank of the opposing party is configured opposed to each other.Now, because the tire circumferential lengths La in conical surface portion, salient angle side is different from the tire circumferential lengths Lb in conical surface portion, re-entrant angle side, so the circumference end in opposed conical surface portion, salient angle side and the circumference end in conical surface portion, re-entrant angle side stagger in the circumferential.Therefore, be difficult to clamp stone between circumference end, therefore, it is possible to improve resistance to horsestone performance further.In addition because the circumferential lengths in the conical surface portion of a side shortens, therefore this part can suppress the minimizing of tread-rubber volume, can suppress the reduction of wear-out life further.
Accompanying drawing explanation
Fig. 1 is the expansion drawing of the tread contour of the embodiment representing band tire of the present invention.
Fig. 2 is the enlarged drawing of zig-zag tap drain in representing.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the block diagram observing conical surface portion, salient angle side from ditch width central side.
Fig. 5 is the block diagram observing conical surface portion, re-entrant angle side from ditch width central side.
Fig. 6 is the enlarged drawing representing outer zig-zag tap drain.
Fig. 7 is the B-B cutaway view of Fig. 6.
Fig. 8 is the partial enlarged drawing of the effect in the conical surface portion, re-entrant angle side illustrated in outer zig-zag tap drain.
Fig. 9 is the block diagram in the conical surface portion, re-entrant angle side observing zig-zag tap drain from ditch width central side.
Figure 10 is the cutaway view of expression two rank taper ditch.
Number in the figure illustrates: 1 ... band tire; 2 ... fetus face; 3 ... zig-zag tap drain; 3A ... interior zig-zag tap drain; 3B ... outer zig-zag tap drain; 10,12 ... conical surface portion, salient angle side; 11,13 ... conical surface portion, re-entrant angle side; 15 ... tire sipe; 17 ... ditch downside wall portion; 18 ... tread sidewall portion; 24,26 ... conical surface portion, salient angle side; 25 ... conical surface portion, re-entrant angle side; 30,31 ... straight line ditch portion; 32 ... otch; C ... corner part; Co ... tire equator face; Ja1, Ja2 ... salient angle lateral bend; Jb1, Jb2 ... re-entrant angle lateral bend; K1, K2 ... furrow bank; Pa1, Pa2 ... salient angle lateral bend point; Pb1, Pb2 ... re-entrant angle lateral bend point; Ts ... tyre surface tread.
Detailed description of the invention
Below, embodiments of the present invention are described in detail.
As shown in Figure 1, the band tire 1 of present embodiment has at least one zig-zag tap drain 3 extended along tire circumference with zig-zag at fetus face 2.Show the situation that above-mentioned zig-zag tap drain 3 comprises altogether three zig-zag tap drains in this example, that is: one that extends on the Co of tire equator face interior zig-zag tap drain 3A and be configured in this interior zig-zag tap drain 3A tire axial two outside external zig-zag tap drain 3B, a 3B.But be not limited to this formation, such as, as interior zig-zag tap drain, a couple's interior zig-zag tap drain 3A, 3A of being configured in Co both sides, tire equator face can also be set.
Then, as shown in Figure 2,6, the salient angle lateral bend point Pa1 that furrow bank K1 protrudes to ditch width central side by the furrow bank K1 of the side in furrow bank K1, K2 of inside and outside zig-zag tap drain 3A, 3B both sides and furrow bank K1 is to the recessed re-entrant angle lateral bend point Pb1 alternate repetition of ditch width central side and extend with zig-zag, and the re-entrant angle lateral bend point Pb2 alternate repetition that is recessed into ditch width central side of the furrow bank K2 of the opposing party salient angle lateral bend point Pa2 that furrow bank K2 is protruded to ditch width central side and furrow bank K2 extending with zig-zag.In addition, it is right that the re-entrant angle lateral bend point Pb2 of the salient angle lateral bend point Pa1 of the furrow bank K1 of one side and the furrow bank K2 of the opposing party is formed opposed to each other, and it is right that the salient angle lateral bend point Pa2 of the furrow bank K2 of the opposing party and the furrow bank K1 re-entrant angle lateral bend point Pb1 of a side is formed opposed to each other.
Wherein, as in Fig. 3,7 represent inside and outside zig-zag tap drain 3A, 3B cross section, though ditch width WA, WB of above-mentioned inside and outside zig-zag tap drain 3A, 3B and the non-particular determination of trench depth DA, DB, if but too small, likely make drainage performance be deteriorated, if contrary excessive, making except road-holding property reduces except reducing decorative pattern rigidity, also reducing tread-rubber volume and causing the reduction of wear-out life.According to such viewpoint, the lower limit of ditch width WA, WB of inside and outside zig-zag tap drain 3A, 3B is same with tire in the past, for more than 2.5% of tread width TW (shown in Fig. 1), be more preferably more than 3.0%, and the upper limit is less than 10.0% of above-mentioned tread width TW, is more preferably less than 8.0%.In addition, the inside and outside trench depth DA of zig-zag tap drain 3A, 3B, the lower limit of DB are more than 4.0% of tread width TW, be more preferably more than 5.0%, and the upper limit are less than 10.0% of tread width TW, is more preferably less than 9.0%.Especially, when band tire, above-mentioned ditch width WA, WB and trench depth DA, DB are all preferably the scope of 10 ~ 25mm.Wherein, above-mentioned ditch width WA, WB represent the ditch width at tyre surface tread Ts place in the ditch cross section at a right angle with the length direction of each tap drain, and trench depth DA, DB represent the trench depth apart from the darkest most deep of tyre surface tread Ts.In addition, interior zig-zag tap drain 3A and outer zig-zag tap drain 3B is equal at the tire jaggy pitch number of a week, is formed with roughly certain width circumferential ribs circumferentially thus inside and outside between zig-zag tap drain 3A, 3B.
In addition, as shown in Figure 2, on the furrow bank K1 of a side of above-mentioned interior zig-zag tap drain 3A, be provided with at the salient angle lateral bend Ja1 comprising above-mentioned salient angle lateral bend point Pa1, with inclined-plane, corner part C (shown in Fig. 4) crossing with tyre surface tread Ts for above-mentioned furrow bank K1 cut away formed conical surface portion, salient angle side 10, and comprising the re-entrant angle lateral bend Jb1 of above-mentioned re-entrant angle lateral bend point Pb1, be provided with, with inclined-plane, corner part C (shown in Fig. 5) crossing with tyre surface tread Ts for furrow bank K1 cut away formed conical surface portion, re-entrant angle side 11.In addition, equally, on the furrow bank K2 of the opposing party of interior zig-zag tap drain 3A, comprising the salient angle lateral bend Ja2 of above-mentioned salient angle lateral bend point Pa2, be provided with, with inclined-plane, the corner part C that above-mentioned furrow bank K2 is crossing with tyre surface tread Ts cut away formed conical surface portion, salient angle side 12, and comprising the re-entrant angle lateral bend Jb2 of above-mentioned re-entrant angle lateral bend point Pb2, be provided with, with inclined-plane, the corner part C that furrow bank K2 is crossing with tyre surface tread Ts cut away formed conical surface portion, re-entrant angle side 13.
In this example, conical surface portion, above-mentioned salient angle side 10,12 is mutually identical formation, as in the diagram with conical surface portion, salient angle side 10 for representative represents, formed by two dip plane part 20A, 20B of triangle.Specifically, when the point crossing with the upper limb E1 of furrow bank K1 at the salient angle lateral bend point Pa1 by above-mentioned furrow bank K1 is set to summit Q, the dip plane part 20A of one side is formed following 3 triangles be formed by connecting, that is: leave the some Ft on the above-mentioned salient angle lateral bend point Pa1 of above-mentioned summit Q, from above-mentioned summit Q to the some Fv the some Fu the above-mentioned upper limb E1 that a circumferential side side is left and the tyre surface tread Ts that leaves at tire axial from above-mentioned summit Q.In addition, the dip plane part 20B of the opposing party is by above-mentioned some Ft, above-mentioned some Fv and the triangle that is formed by connecting to the some Fw the above-mentioned upper limb E1 that circumferential the opposing party side is left from above-mentioned summit Q.
Therefore in this example, the tapering depth H of conical surface portion, above-mentioned salient angle side 10 from tyre surface tread Ts is maxim Hmax in the position of above-mentioned salient angle lateral bend point Pa1, and this tapering depth H reduces gradually along with leaving from above-mentioned salient angle lateral bend point Pa1, and becomes 0 (zero) in the position of Fu, Fv, Fw at above-mentioned.In addition in this example, dip plane part 20A, the 20B of one side, the opposing party are formed as identical shape.
In contrast, conical surface portion, above-mentioned re-entrant angle side 11,13 is mutually identical formation, as in Figure 5 with conical surface portion, re-entrant angle side 11 for representative represents, in this example, formed by two dip plane part 21A, 21B of quadrilateral shape.Specifically, when the point crossing with the upper limb E1 of furrow bank K1 at the re-entrant angle lateral bend point Pb1 by above-mentioned furrow bank K1 is set to summit Q, the dip plane part 21A of one side forms the quadrilateral shape of being surrounded by following four lines, that is: by line G1 that the some Ft on the above-mentioned re-entrant angle lateral bend point Pb1 left from above-mentioned summit Q is connected with the some Fv on the tyre surface tread Ts left from above-mentioned summit Q along tire axial, from above-mentioned some Ft to above-mentioned upper limb E1 abreast to the line G2 the furrow bank K1 that a circumferential side side extends, from above-mentioned some Fv to above-mentioned upper limb E1 abreast to the line G3 the tyre surface tread Ts that a circumferential side side extends, and by above-mentioned line G2, the line G4 connected between the end of G3.In addition the dip plane part 21B of the opposing party is formed as the quadrilateral shape of being surrounded by following four lines, that is: above-mentioned line G1, from above-mentioned some Ft to above-mentioned upper limb E1 abreast to the line G5 the furrow bank K1 that circumferential the opposing party extends, from above-mentioned some Fv to above-mentioned upper limb E1 abreast to the line G6 the tyre surface tread Ts that circumferential the opposing party side extends and the line G7 that will be connected between the end of above-mentioned line G5, G6.
Therefore in this example, the tapering depth H from tyre surface tread Ts in conical surface portion, above-mentioned re-entrant angle side 11 is certain in the position of above-mentioned line G2, G5 and is maxim Hmax, and the position of online G3, G6 is 0 (zero).Wherein, dip plane part 21A, the 21B of one side, the opposing party are parallelogram like in this example, and are formed as identical shape.
In addition, the tire circumferential lengths La in conical surface portion, above-mentioned salient angle side 10,12 is different from the tire circumferential lengths Lb in conical surface portion, above-mentioned re-entrant angle side 11,13, is set as by above-mentioned circumferential lengths La less than above-mentioned circumferential lengths Lb in this example.
Like this, the most easily producing in horsestone in zig-zag tap drain 3A, salient angle lateral bend Ja1, the Ja2 of furrow bank K1, K2 in its both sides and re-entrant angle lateral bend Jb1, Jb2, arrange conical surface portion, salient angle side 10,12 and the conical surface portion, re-entrant angle side 11,13 of chamfering shape.Therefore, it is possible to the reduction of the tread-rubber volume caused by being formed of above-mentioned conical surface portion 10 ~ 13 is suppressed to Min., and the problem producing horsestone in zig-zag tap drain significantly at sweep can be suppressed.In addition owing to making above-mentioned circumferential lengths La, Lb different, so the circumference end in opposed conical surface portion, salient angle side 10 and the circumference end in conical surface portion, re-entrant angle side 13 and the circumference end in opposed conical surface portion, re-entrant angle side 11 and the circumference end in conical surface portion, salient angle side 12 stagger in the circumferential.Therefore be also difficult to produce horsestone between the circumference end in conical surface portion 10 ~ 13, thus resistance to horsestone performance can be improved further.In addition due to a side conical surface portion, be in this example conical surface portion, salient angle side 10,12 circumferential lengths La shorten, so this part can suppress the minimizing of tread-rubber volume, the reduction of wear-out life can be suppressed further.
The maxim Hmax of the tapering depth H in above-mentioned conical surface portion 10 ~ 13 is preferably the scope of 10 ~ 30% of the above-mentioned trench depth DA of zig-zag tap drain 3A, only can play its effect at the wearing and tearing initial stage easily producing horsestone thus, further suppress the reduction of tread-rubber volume.Wherein, then cannot give full play to the effect suppressing horsestone when being less than 10%, if contrary to 30%, then tread-rubber volume can be made unnecessarily to reduce, thus the wear-out life of tire is made a very bad impression.The maximum width Wp (shown in Fig. 2,3,7) of the distance above-mentioned summit Q in this male cone (strobilus masculinus) portion 10 ~ 13 is preferably the scope of 10 ~ 25% of the above-mentioned ditch width WA of zig-zag tap drain 3A, if be less than 10%, the effect suppressing horsestone cannot be given full play to, if contrary to 25%, tread-rubber volume then can be made unnecessarily to reduce, thus the wear-out life of tire is made a very bad impression.
In addition, the tire circumferential lengths Lb in conical surface portion, above-mentioned re-entrant angle side 11,13 is preferably 15 ~ 30% of the average jaggy pitch length LP of above-mentioned zig-zag tap drain 3A, if be less than 15%, the effect suppressing horsestone cannot be given full play to, if contrary to 30%, tread-rubber volume then can be made unnecessarily to reduce, thus the wear-out life of tire is made a very bad impression.In addition, the tire circumferential lengths La in conical surface portion, above-mentioned salient angle side 10,12 is preferably the scope of 35 ~ 55% of above-mentioned length Lb.Wherein, average jaggy pitch length LP is by the one week length of interior zig-zag tap drain 3A being obtained divided by its jaggy pitch number.
In addition, in this example in order to improve the effect suppressing horsestone, and the tire sipe 15 extended from salient angle lateral bend point Pa1, Pa2 of furrow bank K1, K2 of above-mentioned both sides is provided with at above-mentioned fetus face 2.Utilize this tire sipe 15 can make the rubber easily movement of above-mentioned salient angle lateral bend Ja1, Ja2, thus the stone being clipped in this part is easily discharged.Wherein, above-mentioned tire sipe 15 between above-mentioned dip plane part 20A, 20B through and at salient angle lateral bend point Pa1, Pa2 opening.In addition, the depth H 15 (shown in Fig. 3) of tire sipe 15 be preferably the tapering depth H in conical surface portion, above-mentioned salient angle side 10,12 more than maxim Hmax and at above-mentioned below the trench depth DA of zig-zag tap drain 3A.
In addition, as shown in Figure 3, furrow bank K1, K2 of the both sides of above-mentioned interior zig-zag tap drain 3A comprise ditch downside wall portion 17 and tread sidewall portion 18, wherein, ditch downside wall portion 17 extends to the position of 20 ~ 50% of above-mentioned trench depth DA from bottom of trench 16, tread sidewall portion 18 is connected with the upper end in this ditch downside wall portion 17 and relative to large than this ditch downside wall portion 17 of the angle θ 2 of the normal of tyre surface tread Ts.Wherein, the angle θ 2 in above-mentioned tread sidewall portion 18 is preferably the scope of 10 ~ 20 °, and above-mentioned ditch downside wall portion 17 is preferably more than 10 ° relative to the angle θ 1 of the normal of tyre surface tread Ts and the difference (θ 2-θ 1) of above-mentioned angle θ 2.Thus, reduce further the generation of horsestone.
In addition, in order to reduce the damage caused bottom of trench 16 when producing horsestone, in this example, block jut 19 is formed at above-mentioned bottom of trench 16.As shown in Figure 2, this jut 19 forms substantially rectangular shape when top view, and arranges along the width centreline interval of interior zig-zag tap drain 3A.Wherein above-mentioned jut 19 is apart from the projecting height h1 of bottom of trench 16, be preferably the scope of 50 ~ 90% of the height h2 of the upper end distance bottom of trench 16 in above-mentioned ditch downside wall portion 17, if be less than 50%, the effect suppressing damage cannot be given full play to, if contrary to 90%, ditch volume can be made unnecessarily to reduce and cause the reduction of wet road performance.
Then, as shown in Figure 6, outer zig-zag tap drain 3B is same with interior zig-zag tap drain 3A on the furrow bank K1 of a side, comprising the salient angle lateral bend Ja1 of above-mentioned salient angle lateral bend point Pa1, be provided with, with inclined-plane, the corner part C that above-mentioned furrow bank K1 is crossing with tyre surface tread Ts cut away formed conical surface portion, salient angle side 24, and comprising the re-entrant angle lateral bend Jb1 of above-mentioned re-entrant angle lateral bend point Pb1, be provided with, with inclined-plane, the corner part C that furrow bank K1 is crossing with tyre surface tread Ts cut away formed conical surface portion, re-entrant angle side 25.In contrast, the furrow bank K2 of the opposing party of zig-zag tap drain 3B is outside provided with conical surface portion, salient angle side 26 at salient angle lateral bend Ja2, and conical surface portion, re-entrant angle side is not set at re-entrant angle lateral bend Jb2.
In addition, outside in zig-zag tap drain 3B, the furrow bank K2 of the opposing party is configured in inside tire axial.That is, the furrow bank K1 being configured at the side outside tire axial is formed with conical surface portion, salient angle side 24 and conical surface portion, re-entrant angle side 25, and is only formed with conical surface portion, salient angle side 26 on the furrow bank K2 being configured at the opposing party inside tire axial.
In this example, conical surface portion, above-mentioned salient angle side 24,26 is identical formation with the conical surface portion, salient angle side 10,12 of above-mentioned interior zig-zag tap drain 3A, as shown in Figure 3 above, is formed respectively by two dip plane part 20A, 20B of above-mentioned triangle.Therefore salient angle side conical surface portion 24,26 also with conical surface portion, salient angle side 10,12 same, tapering depth H is maxim Hmax in the position of salient angle lateral bend point Pa1, and this tapering depth H reduces gradually along with leaving from above-mentioned salient angle lateral bend point Pa1.
On the other hand, conical surface portion, above-mentioned re-entrant angle side 25 in this example from the conical surface portion, re-entrant angle side 11 of above-mentioned interior zig-zag tap drain 3A, 13 different, as shown in Figure 8, be only formed in the tire circumference one side side of above-mentioned re-entrant angle lateral bend point Pb1.Specifically, re-entrant angle side conical surface portion 25 is formed by a dip plane part 21A of parallelogram like in this example, and is set as by the tire circumferential lengths Lb of this dip plane part 21A larger than the tire circumferential lengths La in conical surface portion, above-mentioned salient angle side 24,26.
By such formation, as shown in Figure 9, the circumferential distance of the tire circumference end e distance re-entrant angle lateral bend point Pb1 in conical surface portion, re-entrant angle side 11,13 (representing with long and short dash line) is 0.5 × Lb, and hold e circumferential relative to the tire in this conical surface portion, re-entrant angle side 25 is Lb apart from the circumferential distance of re-entrant angle lateral bend point Pb1.Therefore, when the stone N be sandwiched in zig-zag tap drain moves due to the rolling of tire, this stone N early can arrive the tire circumference end e in conical surface portion, re-entrant angle side 25, thus can easily discharge from this conical surface portion, re-entrant angle side 25.
In addition, outside in zig-zag tap drain 3B, the furrow bank K1 of a side is formed conical surface portion, salient angle side 24 and conical surface portion, re-entrant angle side 25, and is only formed with conical surface portion, salient angle side 26 on the furrow bank K2 of the opposing party.Namely, outside in zig-zag tap drain 3B, owing to forming conical surface portion, salient angle side 26 and rigid phase opposed with conical surface portion, re-entrant angle side 25 to not opposed with conical surface portion, re-entrant angle side and the rigid phase of the curve Mc reduced and conical surface portion, salient angle side 24 to the curve Mh increased thus rigidity becomes uneven.Thus, mobile when tire rolling of outer zig-zag tap drain 3B increases, thus can play and easily the stone be clipped in this outer zig-zag tap drain 3B is discharged such effect.
In addition, due to the reason identical with interior zig-zag tap drain 3A, outside in zig-zag tap drain 3B, the tire circumferential lengths Lb in conical surface portion, above-mentioned re-entrant angle side 25 is also preferably 15 ~ 30% of the average jaggy pitch length LP of outer zig-zag tap drain 3B, and the tire circumferential lengths La in conical surface portion, above-mentioned salient angle side 24,26 is also preferably the scope of 55 ~ 75% of above-mentioned length Lb in addition.In addition the maxim Hmax of the tapering depth H in above-mentioned conical surface portion 24 ~ 26 is preferably the scope of 10 ~ 30% of the above-mentioned trench depth DB of zig-zag tap drain 3B, and the maximum width Wp of the distance summit Q in this male cone (strobilus masculinus) portion 24 ~ 26 is preferably the scope of 10 ~ 25% of the above-mentioned ditch width WB of zig-zag tap drain 3B.
In addition, as shown in Figure 7, furrow bank K1, K2 of the both sides of above-mentioned outer zig-zag tap drain 3B, have angle θ 3 ground from bottom of trench 16 to tyre surface tread Ts relative to the normal of tyre surface tread Ts.In addition, in order to suppress in the inside and outside difference producing resistance to horsestone performance between zig-zag tap drain 3A, 3B, so preferably by the difference of above-mentioned angle θ 3 with angle θ 2 | θ 2-θ 3| reduces to less than 5 °.
In addition, the furrow bank K2 of above-mentioned the opposing party of above-mentioned outer zig-zag tap drain 3B has in above-mentioned re-entrant angle lateral bend point Pb2 and and the straight line ditch portion 30,31 of both sides that extends between the tire circumference adjacent salient angle lateral bend point Pa2 in both sides of this re-entrant angle lateral bend point Pb2.And the otch 32 extended from the straight line ditch portion 30 of the side the straight line ditch portion 30,31 of above-mentioned both sides is provided with at fetus face 2.Wherein, comprise as otch 32: ditch width is greater than the ditch of 1.5mm that is traverse furrow and incision-like recess that is slit etc. at the ditch of below 1.5mm that is tire sipe, ditch width.In this example, be above-mentioned tire sipe 15 exemplified with above-mentioned otch 32 and its one end situation of intersecting with above-mentioned straight line ditch portion 30.In addition because outer zig-zag tap drain 3B effect when turning has larger load, so need the rigidity larger than interior zig-zag tap drain 3A, therefore otch is not set at re-entrant angle lateral bend point Pb2 and salient angle lateral bend point Pa2 by arranging otch 32 in straight line ditch portion 30,31 and suppresses rigidity to reduce.
Above, be illustrated embodiments of the present invention, but the present invention is not limited to above-mentioned concrete embodiment, also variable more various mode is implemented.
(embodiment)
Based on table 1,2 specification, manufactured experimently the band tire (tire size 11.00R20) of the tread contour with Fig. 1, and the resistance to horsestone performance of this testing tire and wear-out life tested.Comparative example 1 is the example not forming conical surface portion, salient angle side, conical surface portion, re-entrant angle side at inside and outside zig-zag tap drain in addition.Comparative example 2,3 is examples that the total length spreading all over inside and outside zig-zag tap drain is formed with conical surface portion.In addition, the conical surface portion, re-entrant angle side of outer zig-zag tap drain is only formed in the furrow bank outside tire axial.
Except table 1,2 record except, be essentially identical specification.
Interior zig-zag tap drain
Ditch width WA---13.0mm
Trench depth DA---16.3mm
The angle θ 1---1 ° in ditch downside wall portion
The height h2---5.4mm in ditch downside wall portion
The angle θ 2---13 ° in tread sidewall portion
Outer zig-zag tap drain
Ditch width WB---13.0mm
Trench depth DB---16.3mm
The angle θ 3---16 ° of furrow bank
Average jaggy pitch length LP---56.5mm
The resistance to horsestone performance > of <
Above-mentioned tire is installed on vehicle rear wheel under the following conditions, and travel 2000km with the speed of 40 ~ 60km/h in the many place of stone, after traveling, the number of the stone be clamped in interior zig-zag tap drain and the number of stone that is clamped in outer zig-zag tap drain are checked.Its result, represents the index that the horsestone number of zig-zag tap drain in comparative example 1 and the horsestone number of outer zig-zag tap drain are set to 100 respectively.Numerical value is more little better.
Wheel rim: 8.0V × 20
Interior pressure: 830kPa
Vehicle: load carrying ability is the tip lorry (without loading) of 10 tons
< wear-out life >
By when using above-mentioned vehicle to travel to trench depth on Ordinary road and expressway be new tire 30% time the distance that travels, represent with index comparative example 1 being set to 100.Numerical value is more large better.
Table 1:
Table 2:
It is as shown in the table confirms, and the reduction of wear-out life can be suppressed to Min. and effectively can suppress the generation of horsestone by the tire of embodiment.
Claims (9)
1. a band tire, have the zig-zag tap drain extended along tire circumference with zig-zag at fetus face, the feature of this band tire is,
The salient angle lateral bend point that furrow bank protrudes to ditch width central side by the furrow bank of the both sides of above-mentioned zig-zag tap drain respectively and furrow bank alternately extend with zig-zag repeatedly to the re-entrant angle lateral bend point that ditch width central side is recessed, and it is right that the re-entrant angle lateral bend point of the furrow bank of the salient angle lateral bend point of the furrow bank of a side and the opposing party is formed opposed to each other
Above-mentioned zig-zag tap drain comprises and is configured on tire equator face or the interior zig-zag tap drain of the both sides in tire equator face, and
This interior zig-zag tap drain, the furrow bank of both sides is provided with conical surface portion, salient angle side at the salient angle lateral bend comprising above-mentioned salient angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, salient angle side, and be provided with conical surface portion, re-entrant angle side at the re-entrant angle lateral bend comprising above-mentioned re-entrant angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, re-entrant angle side, and
On the cross section orthogonal with interior zig-zag tap drain, conical surface portion, above-mentioned re-entrant angle side is connected with furrow bank and tyre surface tread with straight line,
The tire circumferential lengths (La) in conical surface portion, above-mentioned salient angle side is different from the tire circumferential lengths (Lb) in conical surface portion, above-mentioned re-entrant angle side.
2. band tire according to claim 1, is characterized in that,
The tire circumferential lengths (La) in conical surface portion, above-mentioned salient angle side is less than the tire circumferential lengths (Lb) in conical surface portion, above-mentioned re-entrant angle side.
3. band tire according to claim 1, is characterized in that,
The tapering depth H from tyre surface tread in conical surface portion, above-mentioned salient angle side is maximum in the position of the point of inflection of above-mentioned salient angle side, and this tapering depth H is left along with the point of inflection from above-mentioned salient angle side and reduces gradually.
4. band tire according to claim 2, is characterized in that,
The tapering depth H from tyre surface tread in conical surface portion, above-mentioned salient angle side is maximum in the position of the point of inflection of above-mentioned salient angle side, and this tapering depth H is left along with the point of inflection from above-mentioned salient angle side and reduces gradually.
5. band tire as claimed in any of claims 1 to 4, is characterized in that,
Above-mentioned fetus face has the tire sipe extended from the above-mentioned salient angle lateral bend point of the furrow bank of both sides.
6. band tire as claimed in any of claims 1 to 4, is characterized in that,
Above-mentioned zig-zag tap drain comprises outer zig-zag tap drain outside the tire axial of above-mentioned interior zig-zag tap drain,
This outer zig-zag tap drain, the furrow bank of a side is provided with conical surface portion, salient angle side at the salient angle lateral bend comprising above-mentioned salient angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, salient angle side, and be provided with conical surface portion, re-entrant angle side at the re-entrant angle lateral bend comprising above-mentioned re-entrant angle lateral bend point, the corner part that furrow bank is crossing with tyre surface tread cuts away formed with inclined-plane by this conical surface portion, re-entrant angle side, and
On the furrow bank of the opposing party, be provided with conical surface portion, salient angle side at salient angle lateral bend, and conical surface portion, re-entrant angle side is not set at re-entrant angle lateral bend.
7. band tire according to claim 6, is characterized in that,
The furrow bank of above-mentioned the opposing party of above-mentioned outer zig-zag tap drain is configured in inside tire axial.
8. band tire according to claim 6, is characterized in that,
Above-mentioned fetus face has otch on the furrow bank of above-mentioned the opposing party, this otch from re-entrant angle lateral bend point and and the straight line ditch portion of both sides that extends between the adjacent salient angle lateral bend point in tire circumference both sides of this re-entrant angle lateral bend point the straight line ditch portion of a side extend.
9. band tire as claimed in any of claims 1 to 4, is characterized in that,
The furrow bank of the both sides of above-mentioned interior zig-zag tap drain comprises ditch downside wall portion and tread sidewall portion, wherein, above-mentioned ditch downside wall portion extends to the position of 20 ~ 50% of trench depth DA from bottom of trench, above-mentioned tread sidewall portion is connected with this ditch downside wall portion and relative to large than this ditch downside wall portion of the angle of the normal of tyre surface tread.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-203440 | 2010-09-10 | ||
| JP2010203440A JP5134662B2 (en) | 2010-09-10 | 2010-09-10 | Heavy duty tire |
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| CN102398485A CN102398485A (en) | 2012-04-04 |
| CN102398485B true CN102398485B (en) | 2015-09-30 |
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| JP (1) | JP5134662B2 (en) |
| KR (1) | KR101697378B1 (en) |
| CN (1) | CN102398485B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1404060B1 (en) * | 2011-02-14 | 2013-11-08 | Bridgestone Corp | TREAD STRIP WITH ASYMMETRIC GROOVES TO REDUCE THE RETENTION OF DEPRESSION |
| CN102887039A (en) * | 2012-10-23 | 2013-01-23 | 厦门正新橡胶工业有限公司 | Stone-clamping preventing tyre |
| US10471778B2 (en) | 2013-05-13 | 2019-11-12 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| JP5890353B2 (en) * | 2013-07-26 | 2016-03-22 | 株式会社ブリヂストン | Pneumatic radial tire |
| WO2015012402A1 (en) * | 2013-07-26 | 2015-01-29 | 株式会社ブリヂストン | Pneumatic radial tire |
| JP5841572B2 (en) * | 2013-08-05 | 2016-01-13 | 住友ゴム工業株式会社 | Heavy duty tire |
| JP6930944B2 (en) * | 2018-06-21 | 2021-09-01 | 株式会社ブリヂストン | tire |
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| CN101314317A (en) * | 2007-05-31 | 2008-12-03 | 住友橡胶工业株式会社 | Pneumatic tire |
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| JP4796246B2 (en) | 2001-08-08 | 2011-10-19 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP4516342B2 (en) * | 2004-03-31 | 2010-08-04 | 住友ゴム工業株式会社 | Heavy duty tire |
| JP4598851B2 (en) * | 2008-10-17 | 2010-12-15 | 住友ゴム工業株式会社 | Heavy duty tire |
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| CN101314317A (en) * | 2007-05-31 | 2008-12-03 | 住友橡胶工业株式会社 | Pneumatic tire |
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| Publication number | Publication date |
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| KR20120026983A (en) | 2012-03-20 |
| KR101697378B1 (en) | 2017-01-17 |
| JP5134662B2 (en) | 2013-01-30 |
| CN102398485A (en) | 2012-04-04 |
| JP2012056513A (en) | 2012-03-22 |
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