CN100500456C - Heavy duty pneumatic tire - Google Patents
Heavy duty pneumatic tire Download PDFInfo
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- CN100500456C CN100500456C CNB2005101236489A CN200510123648A CN100500456C CN 100500456 C CN100500456 C CN 100500456C CN B2005101236489 A CNB2005101236489 A CN B2005101236489A CN 200510123648 A CN200510123648 A CN 200510123648A CN 100500456 C CN100500456 C CN 100500456C
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- groove
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- longitudinal groove
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1369—Tie bars for linking block elements and bridging the groove
Abstract
It aims to provide a heavy duty pneumatic tire with block patterns and capable of improving deflected wear resisting performances without sacrificing wet grip performances or on-snow performances and that can particularly be favorably used for all seasons. The present invention comprises block patterns employing at least three types of blocks 4 comprised of central blocks 4 C delimited by the central longitudinal groove 2 M, the intermediate longitudinal grooves 2 M, and the central lateral grooves 3 C, intermediate blocks 4 M delimited by the intermediate longitudinal grooves 2 M, the outer longitudinal grooves 2 S and the intermediate lateral grooves 3 M, and outer blocks 4 S that are delimited by outer longitudinal grooves 2 S, outer lateral grooves 3 S that extend from this outer longitudinal grooves 2 S to the tread ends E, and wherein longitudinal length ratios (L4/W4) of blocks 4 , groove width ratios of longitudinal grooves and lateral grooves (w2/w3), maximum widths of blocks, minimum widths of blocks and ratios thereof (W4max/W4min), and circumferential edge components and tire axial edge components and ratios thereof (EC/EL) at respective stages of wear are defined to be within specified ranges.
Description
Technical field
The present invention relates to a kind of by improving the heavy-duty pneumatic tire that tread contour has improved anti-eccentric wear damage performance.
Background technology
Wish to adopt the tire that can be used for all seasons as being used for for example heavy-duty pneumatic tire of the heavily loaded vehicle such as truck, city motor bus.For reaching the purpose of safety traffic on the road surface of multiple condition, so round-the-clock heavy-duty pneumatic tire need be kept high wet earth-catching property and driving stability.For this reason, mainly adopt the piece decorative pattern as tread contour as a rule.
On the other hand, for the tire of tool piece decorative pattern, particularly heavy-duty pneumatic tire, big shear action at first contact side and the last contact side to the hand of rotation when travelling or brake, and between tire and road surface, produce cliding friction.Therefore, alleged tire heel/tire toe wearing and tearing (referring to the H/T wearing and tearing) are easy to take place, and wherein said at first contact side on hand of rotation and last contact side can localized wears.
Japanese Patent is openly applied for 2004-106747 number and Japanese Patent applies for that openly the 2004-2032687 suggestion provides tie-rod as preventing H/T worn-down device between piece.Also considering recently increases the rigidity of tread surface as preventing mode by big ridge/groove is set.For example, Japanese Patent is openly applied for a kind of heavy-duty pneumatic tire of 2000-177326 suggestion, it has the shoulder block that is formed at the tire shoulder place, and this shoulder block is cut apart in the tire axial medial and lateral, and has the sipes per tire that comprises with the curve of evagination mode bending.
Consider tyre performance and above-mentioned performance, need to suppress to follow the degeneration of wear-process.
For example, be the degeneration of the wetland performance that suppresses the wearing and tearing later stage, suggestion a) forms the tread-rubber of the multilayer with different rubber constituents; And b) later stage on tread surface, expose rubber layer, present the preferable wetland performance that goes into a skid with high friction force in wearing and tearing.Yet such technology has been brought owing to the eccentric wear damage produces this rubber layer with high friction and has been exposed uneven problem.This can damage the wetland performance conversely and the internal layer in the rubber layer is peeled off.
Consider described circumstances, the present inventor is devoted to the partly research of forming length at the edge of the circumferential edge formation of (forming spine) of piece by tread contour.Therefore, find following some be important: the turning efficiency that (1) is particularly paid attention in view of the wetland performance, the circumferential edge of tire is formed very important.Wetland performance for must be with new product with the wetland property retention time is the same high, need increase the length that the circumferential edge of tire is formed along with worn-down;
(2) concerning in view of the snow tractive property that upward performance is attached great importance to, a) edge of tire axial composition is important; And b) preferably carry out and increase this composition along with worn-down.Yet the situation of tire is snowed and will be guaranteed performance on 50% worn-down in the winter time.Therefore, do not need the wetland performance when surpassing that performance is kept with new product on the snow of 50% worn-down tire the same high.Therefore, guaranteeing to form edge when being not less than new product in the tire axial edge, to form 0.5 times of length just enough.
(3) tire circumferentially and the ratio formed between the length of the edge of tire axial should be balance in each stage of worn-down.
Find that along with wearing and tearing are carried out, the degeneration that can these modes will avenge performance and wetland performance suppresses lowlyer.
In this respect, Japanese Patent applies for that openly H10-76812 discloses by following wearing and tearing to increase the technology that the groove area suppresses the degeneration of slip-skid prevention performance (wetland performance).
Summary of the invention
The purpose of this invention is to provide a kind of heavy-duty pneumatic tire, it comprises that piece decorative pattern and its can improve anti-eccentric wear and decrease performance and do not sacrifice wet earth-catching property or the last performance of snow, and it can be suitable for all-weather service well.
Another object of the present invention provides a kind of heavy-duty pneumatic tire, its can will follow wearing and tearing to carry out and on the snow that produces the degeneration of performance and wetland performance suppress lowlyer.
The present invention includes the piece decorative pattern of the piece of at least three types of employings, this piece of three types comprises: the central block 4C that is separated into by central longitudinal groove 2C, middle longitudinal groove 2M and central lateral trench 3C, the intermediate mass 4M that is separated into by middle longitudinal groove 2M, outer longitudinal groove 2S and intermediate lateral groove 3M, and by outer longitudinal groove 2S, longitudinal groove 2S extends to the external block 4S that the outer lateral trench 3S of tyre surface end E is separated into outside this.
Following four equations are further satisfied in first invention
(L4S/W4S)<(L4M/W4M)<(L4C/W4C)
1.50<L4C/W4C<1.80
1.30<L4M/W4M<1.65
0.90<L4S/W4S<1.10，
Wherein, the longitudinal length of central block, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each central block is defined as L4C,
The longitudinal length of intermediate mass, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each intermediate mass is defined as L4M,
The longitudinal length of external block, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each external block is defined as L4S,
The lateral length of central block, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each central block is defined as W4C,
The lateral length of intermediate mass, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each intermediate mass is defined as W4M, and
The lateral length of external block, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each external block is defined as W4S,
The lengthwise ratio of central block 4C is defined as (L4C/W4C),
The lengthwise ratio of intermediate mass 4M is defined as (L4M/W4M), and
The lengthwise ratio of external block 4S is defined as (L4S/W4S),
And satisfy following three equations:
0.85<w2C/w3C<1.30
0.85<w2M/w3M<1.10
0.9<w2S/w3S<1.10，
Wherein, with the rectangular direction of groove line of centers on the groove width of the central longitudinal groove 2C that measures be defined as w2C,
The groove width of middle longitudinal groove 2M in the same direction is defined as w2M,
The groove width of outer longitudinal groove 2S in the same direction is defined as w2S,
The groove width of central lateral trench 3C in the same direction is defined as w3C,
The groove width of intermediate lateral groove 3M in the same direction is defined as w3M, and
The groove width of outer lateral trench 3S in the same direction is defined as w3S.
Following equation is further satisfied in second invention.
(W4Smax/W4Smin)<(W4Mmax/W4Mmin)<(W4Cmax/W4Cmin)
1.00≤W4Smax/W4Smin≤1.20
1.15≤W4Mmax/W4Mmin≤1.40
1.40≤W4Cmax/W4Cmin≤1.70，
Wherein, in the zone of the central block 4C that is impaled by central longitudinal groove 2C and middle longitudinal groove 2M, the central block maximum width of tire axial width maximum is defined as W4Cmax, and minimum central block minimum width is defined as W4Cmin,
In the zone of the intermediate mass 4M that the intermediate mass 4M by middle longitudinal groove 2M and outer longitudinal groove 2S is impaled, the intermediate mass maximum width of tire axial width maximum is defined as W4Mmax, and the intermediate mass minimum width of minimum is defined as W4Mmin, and
In the zone of the external block 4S that is impaled by outer longitudinal groove 2S and tyre surface end E, the external block maximum width of tire axial width maximum is defined as W4Smax, and minimum external block minimum width is defined as W4Smin.
Following equation is further satisfied in the 3rd invention:
EC50>EC00 …(1)
EC90>EC00 …(2)
EL50>0.5×EL00 …(3)
EL90>0.5×EL00 …(4)
1.5<EC50/EL50<2.2 …(5)
2.5<EC90/EL90<3.5 …(6)。
In the present invention, the number of longitudinal groove is defined as at least 5, in order to improve wet earth-catching property.
In first invention, the circumferential lengths of the piece relevant with tire axial piece rigidity with circumferential piece rigidity and the beguine between tire axial length rationalize according to central authorities, centre and external block.Be provided with this, can improve tractive property and driving stability, and piece groove is on every side arranged well simultaneously, improve the drainage that is used to improve wet earth-catching property thereby make.And the groove width that influences the longitudinal groove of wetland turning efficiency rationalizes according to central authorities, centre and external block with the value of the ratio of the groove width of the lateral trench of influence traction/deceleration and stopping performance.
In second invention, near tire equator and be exposed to along tire circumferentially the piece change width rate of the piece of the power of effect limit relatively largely.This is because the less generation of this location H/T wearing and tearing.This helps to improve tractive property.External block takes rectangular shape to guarantee the propulsive effort and the driving stability of tire.
In other words, when vehicle carried out general craspedodrome forward, normally first contacted to earth central block in the piece.The residence time length on surface and the pressure of contacting to earth of contacting to earth is also big.Therefore, can be when travelling on wet road surface by the ratio between maximum width and the minimum width being provided with to such an extent that make the erasure effect of tearing and wipe moisture film bigger greatly.At the tire shoulder portion place that tire circumferentially has big slippage, establish the maximum width and the ratio between the minimum width of piece less to prevent that the H/T worn-down from taking place.Little by further piece change width rate being established, can relax the wearing and tearing that are distributed on contact side at first and the last contact side can difference, and can limit wearing and tearing that the H/T wearing and tearing that cause other pieces take place can irregularity.
In the 3rd invention, can with follow performance and wetland performance on the snow that carries out of wearing and tearing degeneration limit lowlyer.
Description of drawings
Fig. 1 is the plane outspread drawing that illustrates according to the tread contour of an embodiment of the invention;
Fig. 2 is the planar view that central block is shown in the amplification mode;
Fig. 3 is the planar view that intermediate mass is shown in the amplification mode;
Fig. 4 is the planar view that external block is shown in the amplification mode;
Fig. 5 is another planar view of the details of explanation central block;
Fig. 6 is another planar view of the details of explanation intermediate mass;
Fig. 7 is another planar view of the details of explanation shoulder block;
Fig. 8 is the planar view of explanation intermediate mass, intermediate lateral groove and frenulum;
Fig. 9 is the section drawing of intermediate lateral groove, and wherein Fig. 9 (A) is the section drawing along the A-A line of Fig. 5, and Fig. 9 (B) is the section drawing along the B-B line;
Figure 10 is the plane outspread drawing that gash depth is shown by the right side of enlarged drawing 1;
Figure 11 is the planar view that circumferential edge is formed and axial edge is formed of illustrated block part circumferential edge;
Figure 12 is the section drawing of explanation new product state, 50% wear state and 90% wear state;
Figure 13 (A) and Figure 13 (B) are the planar views of the increase and decrease formed of the edge of explanation wearing and tearing trench portions;
Figure 14 illustrates narrow groove;
Figure 15 (A), (B), (C) are the plane outspread drawings that illustrates according to the situation of the tread surface of tire under each wear state of the embodiment 1 of table 5;
Figure 16 (A), (B), (C) are the plane outspread drawings that illustrates according to the situation of the tread surface of tire under each wear state of the comparing embodiment 1 of table 5.
The specific embodiment
Below explain an embodiment of the invention based on accompanying drawing.Fig. 1 is the plane outspread drawing that the tread contour of tread portion is shown, and the tread portion of heavy-duty pneumatic tire wherein of the present invention (hereinafter to be referred as " tire ") launches with planar fashion.Tread surface TS between tyre surface end E, the E of tire 1 (figure does not show) in comprising the cross section of tire axle is made of single or multiple radius of curvature.This tread surface TS has tread groove 7, and this tread groove 7 comprises the lateral trench 3 that direction that a plurality of longitudinal grooves 2 that circumferentially extend along tire and a plurality of edge and described longitudinal groove 2 intersect is extended, thereby tread surface TS is divided into piece 4.At this, definition tyre surface end E defines into following, tread surface TS and stayed surface intersection form an edge, this edge is defined as tyre surface end E, and with the arc form intersection, the intersection point between the extensional surface of tread surface TS and surface-supported extensional surface is defined as tyre surface end E at tread surface TS and stayed surface.
Therefore, piece 4 comprises the piece 4 that comprises three types at least, this piece of three types 4 comprises: the central block 4C that is impaled by central longitudinal groove 2C, middle longitudinal groove 2M and central lateral trench 3C, the intermediate mass 4M that is impaled by middle longitudinal groove 2M, outer longitudinal groove 2S and intermediate lateral groove 3M, and the external block 4S that is impaled by outer longitudinal groove 2S, outer lateral trench 3S and tyre surface end E, and then tread surface TS forms the piece decorative pattern.
The piece decorative pattern is made of the repeat pattern of decorative pattern unit d.For example, the decorative pattern that will be arranged between the upper and lower nodel line y1, the y2 that extend along tire axial of each outer lateral trench 3S, 3S top (figure) shown in Fig. 1 left end is defined as the decorative pattern unit d that repeats usefulness.The tire circumferential lengths of decorative pattern unit d is expressed as pitch P, and present embodiment is set to disperse frequency noise by adopting the V.P. method that the piece decorative pattern is set.In this method, a plurality of dissimilar decorative pattern unit d are set, wherein the length of pitch P is with about 1.0 to 1.3 times of arrangements.
As shown in Figure 1, tire equator Q and central longitudinal groove 3C intersect at pitch middle position p0.In the present embodiment, each decorative pattern unit d comprises the point symmetry decorative pattern of this pitch central point p0 relatively.Perhaps, for example adopting, the decorative pattern of line symmetric shape also is fine.
Among Fig. 1, central longitudinal groove 2C comprises: (in this regard, Tu Chu summit is called first summit to the circumferential repeat body of the bending groove 2c that summit c1 gives prominence to left left, and needs outstanding summit be called second summit to the right.In this regard, be in the position of groove Central Line such as the position on summit etc. and the ditch angle is a angle with respect to the Central Line).Bending groove 2c comprises the upper inclined portion 2c1 that makes progress among Fig. 1 and the 2c2 of portion that has a down dip.
Middle longitudinal groove 2M in tire equator Q both sides comprises the circumferential repeat body of bending groove 2m, and summit ml (first summit) is outstanding left.This bending groove 2m comprises the upper inclined portion 2ml of top and the 2m2 of portion that has a down dip.The central longitudinal groove 2C of both sides is configured as has identical phase place.
Similar with 2M with middle longitudinal groove 2C to central authorities, among Fig. 1, outer longitudinal groove 2S circumferential repeat body outstanding left by summit s1 and the bending groove 2s that summit s2 gives prominence to the right constitutes.This bending groove 2s comprises the upper inclined portion 2s1 that is positioned at the top and the 2s2 of portion that has a down dip.
In this regard, corresponding first summit of longitudinal groove 2C, 2M and 2S and second summit same position place that is arranged in tire axial respectively and being positioned on the same tire circumference line.
Plane Angle is observed, the central block 4C of one side presents horizontal shape of tail, and have the protrusion that the second summit c2 by central longitudinal groove 2C constitutes, and the central block 4C of opposite side presents horizontal shape of tail, and have the protrusion that the first summit c1 by central longitudinal groove 2C constitutes.
Plane Angle is observed, and the intermediate mass 4M of a side presents horizontal shape of tail, and has the protrusion that the first summit s1 by outer longitudinal groove 2S constitutes, and the central block 4M of opposite side presents horizontal shape of tail, the protrusion that tool is made of the second summit s2 of outer longitudinal groove 2S.
And, the external block 4S of tire axial one side presents base tabular (home plate-like), and have the protrusion that the second summit s1 by outer longitudinal groove 2S constitutes, and that the external block 4S of opposite side presents home base is tabular, and has the protrusion that the first summit s1 by outer longitudinal groove 2S constitutes.
The upper inclined portion 2c1 of the longitudinal groove 2C of central authorities is defined as 15 to 35 degree with respect to the inclined angle alpha 2c1 of the acute side that tire contour (being parallel to tire equator Q) forms, and is preferably 20 to 30 degree.The inclined angle alpha 2c2 of the 2c1 of portion of having a down dip is defined as about 30 to 45 degree, is preferably 20 to 35 degree.Be provided with this, can improve earth-catching property and driving stability.
On the other hand, the inclined angle alpha 2s in acute side of outer longitudinal groove 2S equals to bend the leaning angle of the upper inclined portion 2s1 of groove 2s and the 2s2 of portion that has a down dip, therefore is about 20 to 40 degree.Preferred its greater than the inclined angle alpha 2c1 of the upper inclined portion 2c1 of central longitudinal groove 2C and less than the inclined angle alpha 2c2 of the 2c2 of portion that has a down dip.
Middle longitudinal groove 2M is identical with the leaning angle of the 2m2 of portion that has a down dip with the upper inclined portion 2ml of bending groove 2m with respect to the inclined angle alpha 2m in acute side that the tire contour forms, and considers that draining establishes lessly relatively.In the present embodiment, form about 1 to 15 degree, and be preferably 2 to 8 degree.Angle α 2c (aviation value of upper and lower rake) and α 2s that this angle forms with respect to the tire contour less than central longitudinal groove 2C and outer longitudinal groove 2S.Be provided with this, the water that gathers between the tread surface TS of tire middle body and tire shoulder portion and road surface can circumferentially be discharged easily along tire and be improved wet earth-catching property.
The left side of tire equator Q in Fig. 1, central lateral trench 3C connects the first summit c1 of central longitudinal groove 2C and the first summit ml of middle longitudinal groove 2M.The second summit s2 of the second summit m2 of longitudinal groove 2M and outer longitudinal groove 2S in the middle of intermediate lateral groove 2M connects.Outer lateral trench 3S extends to tyre surface end E from the first summit s1 of outer longitudinal groove 2S.
On the right side, central lateral trench 3C connects the second summit c2 of central longitudinal groove 2C and the second summit m2 of middle longitudinal groove 2M.The first summit s1 of the first summit ml of longitudinal groove 2M and outer longitudinal groove 2S in the middle of intermediate lateral groove 2M connects.Outer lateral trench 3S extends to tyre surface end E from the second summit s2 of outer longitudinal groove 2S.Therefore, can form combined block between middle longitudinal groove 2M, 2M, central block 4C, 4C face with each other in this combined block and tire equator Q is therebetween, thereby improve rigidity and drainage performance, and therefore present good driving stability.
And, lateral trench 3C of central authorities and intermediate lateral groove 3M are along inclined, for example, in the present embodiment, along the left side is the direction inclination on top, and it is identical being defined as with respect to leaning angle b3c, b3m that tire circumferentially forms acute side, and especially less than 50 degree to the scopes of 90 degree, be preferably in the scopes of 65 to 85 degree.The respective angles with respect to the tire contour of outer lateral trench 3S is located in the scope of approximately ± 80 spending, and is preferably in the scopes of ± 84 degree.
At this, the piece decorative pattern of each longitudinal groove 2 and lateral trench 3 is arranged so that preferably they are point symmetry with respect to the central authorities that the central point p0 by the 2c2 of the portion that has a down dip of central longitudinal groove 2C constitutes in each decorative pattern unit d, therefore improve drainage performance and thereby improved wet earth-catching property, and eliminate the variation in right side and left side and improve driving stability.
In the face of the sidepiece of middle the longitudinal groove 2M of central block 4C and the sidepiece of facing the middle longitudinal groove 2M of intermediate mass 4M are formed with the recess 7,8 that obtains by these pieces of central nicking in respective side portion.Be provided with this, form the main maintaining part of water, thereby improve drainage performance and improve tractive property.
In each piece 4, respectively along tire axial extend and pass two tire axial line yc1 of up and down jag of tire week and yc2, ym1 and ym2, and ys1 and ys2 between distance, that is to say that the corresponding tire circumferential distance of central authorities, centre and external block 4 is expressed as central block longitudinal length L4C, intermediate mass longitudinal length L4M and external block longitudinal length L4S.
That is to say:
The longitudinal length of central block, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each central block is defined as L4C;
The longitudinal length of intermediate mass, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each intermediate mass is defined as L4M; And
The longitudinal length of external block, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each external block is defined as L4S.
On the other hand, in each piece 4, along tire circumferentially extend and pass respectively the tire contour xc1 of the upper and lower jag of the tire axial of central authorities, centre and external block 4 and xc2, xm1 and xm2, and xs1 and xs2 between the tire axial distance table be shown central block lateral length W4C, intermediate mass lateral length W4M and external block lateral length W4S.
That is to say:
The lateral length of central block, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each central block is defined as W4C;
The lateral length of intermediate mass, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each intermediate mass is defined as W4M; And
The lateral length of external block, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each external block is defined as W4S.
And satisfy following four equations at the ratio of L4/W4:
(L4S/W4S)<(L4M/W4M)<(L4C/W4C)
1.50<L4C/W4C<1.80
1.30<L4M/W4M<1.65
0.90<L4S/W4S<1.10
In this way, the lengthwise of piece 4 is defined as from central block 4C than L4/W4 and diminishes gradually to external block 4S.Therefore, piece lengthwise degree reduces and makes shape become to be bordering on square relatively.The longitudinal length L of each piece 4 is equivalent to deduct going up of each piece 4 or the length that obtains of the corresponding ditch groove width W3 of lateral trench 3 down by the pitch P from decorative pattern unit d.Therefore, the lengthwise of piece is more relevant with the tire axial length of lateral trench 4 than (L4/W4), and length becomes short more, and lengthwise can be big more than L/W.
By way of parenthesis, usually under the situation of following heavy-duty pneumatic tire, i.e. the middle body of tire, just crown is at first contacted to earth, and centre portion or tire shoulder portion contact to earth thereafter.Therefore, on the wetland road surface, the ponding between tread surface TS and the road surface can flow to the tire axial both sides from the middle body of tyre surface.At this moment, consider draining, it is more favourable that central lateral trench 3C has short tire axial distance.
And, consider the power that acts on the central block 4C, the circumferential power of tire is greater than the power of tire axial.Therefore, central block 4C is made for the shape of tool longitudinal tensile strain, and wherein tire is circumferentially vertically located and the tire axial horizontal location, so that improve tractive property and suppress the inclined to one side worn-down effect of piece, as shown in Figure 1.
On the other hand, because the tread surface TS of tire must have certain curvature, the slippage of tire shoulder portion is usually greater than the slippage of tire middle body.Therefore outer lateral trench 3S highly presents the alleged erasure effect of wiping the moisture film that is formed on the road surface.Therefore compared to central lateral trench 3C, the setting that tire axial length is longer is more favourable for improving wet earth-catching property.And, act on transverse force on the external block 4S greater than the transverse force that acts on the central block 4C.This point is particularly remarkable when rotating, and the lateral rigidity of external block 4S has influenced driving stability largely.Therefore consider wet earth-catching property and driving stability, preferably adopt the shape of longitudinal tensile strain shown in Figure 1.To in this respect, because intermediate mass 4M need present the characteristic between central block 4C and external block 4S, its style characteristic also need be between between it.
Preferably,
1.60<L4C/W4C<1.70
1.40<L4M/W4M<1.55
0.95<L4S/W4S<1.05
And, will be defined as w2C at the groove width of the central longitudinal groove 2C of the directional survey that intersects at a right angle with the groove line of centers,
Groove width at the middle longitudinal groove 2M of equidirectional is defined as w2M,
Groove width at the outer longitudinal groove 2S of equidirectional is defined as w2S,
Groove width at the central lateral trench 3C of equidirectional is defined as w3C,
Groove width at the intermediate lateral groove 3M of equidirectional is defined as w3M, and
Groove width at the outer lateral trench 3S of equidirectional is defined as w3S,
Satisfy following equation than w2/w3:
0.85<w2C/w3C<1.30
0.85<w2M/w3M<1.10
0.9<w2S/w3S<1.10
The groove width w2 that this means longitudinal groove 2 is made as roughly the same with the groove width w3 that is linked to its lateral trench 3.This is because find that this helps promoting the current in the tread surface and helps improving anti-inclined to one side worn-down performance when keeping straight on forward and turning to.The scope of described difference is made as ± and 10%, and preferably be not less than 0.94 to being not more than in 1.06 the scope.
The groove width w2M of the groove width w2C of central longitudinal groove 2C, middle longitudinal groove 2M and outside among the groove width w2S of longitudinal groove 2S, big more near tyre surface end E that is to say more, satisfies following equation.
w2C<w2M<w2S
Vehicle is kept straight on or when suspending, tire contact to earth pressure usually under the line the surface become maximum and more little the closer to the tyre surface end.Under dried ground-surface state, the earth-catching property height, and abrasion resistance properties is favourable to the zone of contacting to earth that enlarges middle body.Under wet ground-surface state, wet earth-catching property is high more, and the width of longitudinal groove 2 is big more, the above-mentioned performance of increase meeting adverse effect of the groove width w2 of the longitudinal groove 2 of middle body.For improving above-mentioned afoul performance, lateral trench width w2 is made as and satisfies above-mentioned relation.In this regard, the bending groove 2c of central longitudinal groove 2C is set to the groove width w2C2 of the 2C2 of portion that has a down dip is made as greater than about 1.05 to 1.60 times of the groove width w2C1 of upper inclined portion 2C1, is beneficial to current.For example, groove width w2C1 can be made as 4mm and groove width w2C2 is 6mm.In this regard, the groove width w2C of central longitudinal groove 2C is defined as the average groove width value of whole length.
In this regard, the groove width w2's of contact to earth the width W T and the longitudinal groove 2 of tread portion is provided with such as following.The width wt that contacts to earth is the decomposition length between tyre surface end E, the E.
0.020≤(w2C/WT)≤0.040
0.025≤(w2M/WT)≤0.045
0.040≤(w2S/WT)≤0.060
By the same token, the following setting of the groove width w3 of lateral trench (the groove width w3M of the groove width w3C of central lateral trench 3C, intermediate lateral groove 3M, the groove width w3S of outer lateral trench 3S).
w3C<w3M<w3S
Under relation as previously discussed, width is arranged on following ranges with respect to the width W T that contacts to earth under conventional situation.
0.015≤(w3C/WT)≤0.035
0.030≤(w3M/WT)≤0.050
0.035≤(w3S/WT)≤0.055
Be made as the closer to the tyre surface end by groove width w3 lateral trench 3 big more, current in the surface of contacting to earth that can promote from the surface, equator to flow and improve wet earth-catching property, and can presenting and longitudinal groove 2 similar effects to the tyre surface end.
In this regard, the value of each piece longitudinal length L, piece lateral length W and groove width w and reference position thereof are that wherein tire sets installs to conventional wheel rim and apply the value of measuring under the pressure condition in conventional interior press conventional on tread surface T, and when tread surface TS and trench wall intersect by arch section, be the value that the place, position of the intersection in the straight plane of its extension obtains.Herein, term " conventional wheel rim " refers to be defined as the conventional wheel rim that meets according to JATMA, according to TRA " design wheel rim (design rim) " and according to the wheel rim of one of ETRTO " measuring wheel rim (measuring rim) ", and term " is pressed in conventional " and is referred to be defined as the maximum gas pressure that meets according to JATMA, according to the maxim of explanation in TRA " the tire road surface limit of various cold inflation pressuries (tire load limites at variouscold inflation pressures) " table with according to the air pressure of one of ETRTO " inflation pressure (inflation pressure) ".Term " conventional load " refers to corresponding to the conventional interior maximum load of pressing according to each standard.When finding fluctuation or analogue, adopts the centerline direction of groove width aviation value.
In the present embodiment, the gash depth of longitudinal groove 2C of central authorities and lateral trench 3C is about 11.0 to 20.0mm, and the gash depth of outer longitudinal groove 2S is than the longitudinal groove 2C of these central authorities dark about 0.2 to 5.0mm, and the depth ratio of outer lateral trench 3S should the lateral trench 3C of central authorities shallow about 7.0 to 13.0mm.These degree of depth are made as wherein the whole degree of depth at the tread contour of wearing and tearing (at least 50% degree of depth wearing and tearing) also clear reservation longitudinal groove 2 in latter stage and lateral trench 3.In this regard, the groove width of channel bottom is made as 50 to 90% (face width ratios) of the groove width on the tread surface.Be provided with this, by latter stage built-in edge form and the piece rigidity of improving crown can solve the problem of wet earth-catching property and driving stability (stability of Zhi Hanging especially forward).
Concerning intermediate mass 4M, the side of longitudinal groove 2S and be maintained the obtuse angle of above-below direction among the figure towards the angle g of the intersection point j of the side of intermediate lateral groove 3M outward is to prevent the punching press wearing and tearing.It circumferentially is uniformly that the tire axial width of intermediate mass 4M is made as at tire, for example, makes the ratio of maxim relative minimum be about 1.0 to 1.3.Therefore, by making at first contact side and the rigid uniform realization tire toe of contact side/tire heel worn-down minimizing at last.
And, prevent that by forming arc with radius of curvature r outstanding piece 4C, 4M and the outstanding end sections of 4S on tire axial eccentric wear from decreasing.Corresponding radius of curvature rC, the rM of piece 4C, 4M and 4S and rS (being generally called r later in equation) preferably are made as 0.05 to 0.30 times by the r coefficient (r4C, r4M, r4S) of piece 4C, the 4M of following equation acquisition and 4S.In this regard, L represents the piece longitudinal length of relevant block, and W represents the piece lateral length of relevant block.
R coefficient=r/ (L * W)
0.5
This be because value less than 0.05 o'clock, the cracked or inclined to one side worn-down effect of above-mentioned anti-stops is less, and value surpasses at 0.30 o'clock, the erasure effect of the block edge in the road surface that wets can reduce.
Secondly, in second invention shown in Fig. 5 to 7, satisfy following equation.
(W4Smax/W4Smin)<(W4Mmax/W4Mmin)<(W4Cmax/W4Cmin)
1.00≤W4Smax/W4Smin≤1.20
1.15≤W4Mmax/W4Mmin≤1.40
1.40≤W4Cmax/W4Cmin≤1.70，
Wherein, in the zone of the central block 4C that is centered on by central longitudinal groove 2C and middle longitudinal groove 2M, the central block maximum width of tire axial width maximum is defined as W4Cmax, and minimum central block minimum width is defined as W4Cmin.
In the zone of the intermediate mass 4M that is centered on by middle longitudinal groove 2M and outer longitudinal groove 2S, the intermediate mass maximum width of tire axial width maximum is defined as W4Mmax, and the intermediate mass minimum width of minimum is defined as W4Mmin.
In the zone of the external block 4S that is centered on by outer longitudinal groove 2S and tyre surface end E, the external block maximum width of tire axial width maximum is defined as W4Smax, and minimum external block minimum width is defined as W4Smin.
In this regard, measure piece maximum width and piece minimum width at the intersection point place that is in towards recessed longitudinal groove 4M side towards the extended surface of each trench wall 4Mw of middle longitudinal groove 4M.Here ignore recess 7,8.
The rate of change of the tire axial width of above-mentioned (W4Smax/W4Smin), (W4Mmax/W4Mmin), (W4Cmax/W4Cmin) indication relevant block 4.Near tire equator Q (the circumferential application force of this place's tire is big and tractive force is little and the H/T wearing and tearing less relatively) central block 4C be defined as than other pieces and have bigger rate of change.In other words, the zigzag bending degree of central longitudinal groove 2C increases.Be provided with this, for example, the vertical/horizontal rigidity of the middle body that the tire week of piece makes progress increases, thereby improves earth-catching property and driving stability.
Big rate of change is set also helps to improve tractive property.On the other hand, for the bigger external block 4S of axial force little ratio (W4Smax/W4Smin) is set near tyre surface end E.Make piece take to make the circumferential wearing and tearing energy uniformization of tire also improve the propulsive effort and the driving stability of tire simultaneously to reduce the H/T wearing and tearing near the shape of rectangle.
More particularly, when carrying out conventional craspedodrome forward, normally first contacts to earth central block 4C in the piece, and its remain on time of road surface the longest contact to earth simultaneously press also big.When realizing travelling of wet road surface with such piece, the ratio (W4max/W4min) between maximum width and the minimum width is bigger, and the erasure effect of tearing and wipe moisture film can be increased, and then improves wet earth-catching property.On the other hand, because bigger in the circumferential slippage of the tire of tire shoulder portion, the H/T wearing and tearing are easy to take place during bigger between the maximum width of piece and the minimum width.In this regard, by with the middle body setting that tire week make progress of maximum width, can be easier to prevent that the H/T worn-down from taking place near each piece.And, by circumferentially the tire axial width of intermediate mass 4M evenly being provided with, for example, be above-mentioned value by the ratio that maxim and minimum value are set at tire, the rigid uniformization of contact side at first and last contact side can be realized that the H/T worn-down reduces.
W4Smax/W4Smin〉under 1.20 the situation, then can not prevent the H/T wearing and tearing of external block 4S.1.15〉W4Mmax/W4Mmin or 1.40〉during W4Mmax/W4Mmin, wet earth-catching property is insufficient.At W4Cmax/W4Cmin＜1.40 or W4Cmax/W4Cmin〉1.70 o'clock, be easy to take place the H/T wearing and tearing at intermediate mass 4M and central block 4C place.
Preferably
1.05≤W4Smax/W4Smin≤1.10
1.20≤W4Mmax/W4Mmin≤1.30
1.50≤W4Cmax/W4Cmin≤1.60
In this regard, maximum width W4Smax, the W4Mmax of each piece and W4Cmax are arranged in the following scope with respect to the width W T that contacts to earth of conventional state
0.16≤W4Smax/WT≤0.20
0.12≤W4Mmax/WT≤0.16
0.11≤W4Cmax/WT≤0.15
The reason that such value is set is to surpass 0.20 as W4Smax/WT, the H/T variation, and when its less than 0.16 the time, produce the SH tire shoulder and descend and wear and tear.When W4Mmax/WT surpasses 0.16, the H/T variation, and when its less than 0.12, produce secondary punching press wearing and tearing.When W4Cmax/WT surpasses 0.15, the H/T variation, and when its less than 0.11, produce the punching press wearing and tearing.
Herein, term " the width W T that contacts to earth of normal condition " refers to install to conventional wheel rim and be filled with the surperficial maximum width that contacts to earth when applying conventional load under the state of pressing in conventional in tire sets.
By adopting above-mentioned setting, can limit that tire slides circumferentially that the eccentric wear that produced decreases and the degeneration that limits other performances simultaneously.Yet,, preferably further limit described eccentric wear and decrease at intermediate mass 4M because be easy in the row of whole intermediate mass 4M cause that the flange of premature wear impacts (rib punching).
For this purpose, provide tie-rod 5 shown in Figure 1 etc. in the intermediate lateral groove 3M between intermediate mass 4M, 4M.Fig. 8 illustrates the partial enlarged view of intermediate mass 4M, 4M and intermediate lateral groove 3M therebetween, and Fig. 9 (A) is the cross section along the A-A of Fig. 8, and Fig. 9 (B) is the section drawing along B-B.Tie-rod 5 protrudes from channel bottom in the substantial middle part of the tire axial of intermediate lateral groove 3M, to connect the trench wall of intermediate mass 4M, 4M.By described tie-rod 5, limited intermediate mass 4M in the circumferential motion of tire, thereby reduced abrasion wheels and suppress above-mentioned inclined to one side worn-down and take place.
The tire axial distance W 5 of tie-rod 5 be defined as the tire axial length W3M that is not less than this intermediate lateral groove 3M 20% and be not more than its 65%.When less than 20% the time, the effect of tie-rod is insufficient, and when surpassing 65%, is easy to wet earth-catching property is had a negative impact.The tie-rod depth D 5 that is given as the distance on the tire axial on 5 surfaces from tread surface TS to tie-rod is defined as the average gash depth D3M that is not less than intermediate lateral groove 3M 25% and be not more than its 75%.When less than 25% the time, the effect of tie-rod can not present, and when surpassing 75%, is easy to wet earth-catching property is had a negative impact.
And tie-rod 5 comprises sipes per tire 6.This sipes per tire 6 can be the notch that width w6 is not more than 1mm, and can be roughly the notch of 0mm.Be provided with this, prevented that tie-rod from improving the reducing of effect of intermediate mass 4M rigid circumference.It has also strengthened the effect of tearing moisture film by the small switching in the surface of contacting to earth.When width surpasses 1mm, the effect of tie-rod reduces.It can also be presented on the degeneration of the wet earth-catching property of restriction when making on the tread surface that intermediate mass 4M is connected at experience wear and tie-rod.The depth D 6 of sipes per tire 6 be defined as the average gash depth that is not less than intermediate lateral groove 3M and the tie-rod degree of depth poor (D3M-D5) 50% and be not more than its 100%.When less than 50% the time, the effect of sipes per tire can not present.When surpassing 100%, that is, the bottom of comparing intermediate lateral groove 3M when the end of sipes per tire is positioned at tire axial when inboard, and the effect that tie-rod improves the rigid circumference of intermediate mass 4M reduces.
In the present embodiment, gash depth is foregoing 15 to 20.0mm, is preferably about 15 to 18mm for central longitudinal groove 2C and lateral trench 3C.The gash depth of outer longitudinal groove 2S and lateral trench 3S is defined as the gash depth dark 0 to 20.0mm than central longitudinal groove 2C and lateral trench 3S.Be provided with this, the degree of depth is made as wherein the whole degree of depth that have the tread contour of the longitudinal groove 2 of tie-rod 5 and lateral trench 3 at least in wearing and tearing (wearing and tearing of 50% degree of depth) also clear reservation in latter stage.The groove width of each channel bottom is made as 50 to 90% of groove width on the tread surface.Be provided with thus, by latter stage built-in edge form and the piece rigidity of improving crown can obtain wet earth-catching property and driving stability (stability of Zhi Hanging especially forward).In this regard, at the directional survey groove width that intersects at a right angle with the groove line of centers.
Secondly, in the 3rd invention, the length balance that the edge that balance is made of the circumferential edge at each wear stage of the piece 4 of tread contour is formed is to satisfy following six equations:
EC50>EC00 …(1)
EC90>EC00 …(2)
EL50>0.5×EL00 …(3)
EL90>0.5×EL00 …(4)
1.5<EC50/EL50<2.2 …(5)
2.5<EC90/EL90<3.5 …(6)
Term " tread surface TS " refers in each stage, just, and at the new product state or with the tread surface of oldState contact road surface.In this regard, be assumed to each wearing and tearing in stage normally carry out tread surface under the situation.The tread surface of new product is defined as TS00, and 50% worn-down tread surface is that TS50 and 90% worn-down tread surface are TS90.And, the intersection of the tread surface TS under the piece wear state that term " profile that the periphery wall of tread surface and piece intersects " refers to expect and the periphery of piece.The overall circumferential edge e of piece is the total length of this profile.
Tread surface TS is the zone between tyre surface end E, the E.Therefore, term " the overall circumferential edge e of piece " expression is arranged in the block edge of tread surface 2.Therefore, leave the place of tyre surface end E at piece 4, the circumferential edge that is positioned at tread surface 2 outsides is removed from the overall circumferential edge e of piece.
From the overall circumferential edge e of piece, take out the notion that the circumferential circumferential edge of tire is formed ec and formed e1 in the axial edge of tire axial.As shown in figure 11, be example with intermediate mass 4M, term " total circumferential edge is formed ec " refers to that piece circumferential edge e is projected into length ec1, the ec2 on tire circumference surface (surface that is parallel to tire equator) from tire axial one side and opposite side ... and.Term " line shaft is formed e1 to the edge " refers to that piece circumferential edge e is projected into length e11, the e12 on tire circumference surface (surface that is parallel to tire axial) respectively from circumferential side of tire and opposite side ... and.
Total circumferential edge under the new product state Y00 of the tread surface TS00 of new product is formed EC and is defined as EC00, and its line shaft is defined as EL00 to the edge composition.The total circumferential edge of " 50% wear state Y50 " on the tread surface TS50 under the 50% worn-down state is formed EC and is defined as EC50, and its line shaft is defined as EL50 to the edge composition.The total circumferential edge of " 90% wear state Y90 " on the tread surface TS90 under 90% wear state is formed EC and is defined as EC90, and its line shaft is defined as EL90 to the edge composition.At this moment, satisfy aforesaid equation (1) to (6).
At this moment, " 50% wear state Y50 " refers to wear state as shown in figure 12, wherein aforementioned 50% the gash depth wearing and tearing that comprise tread groove 7m the darkest in the tread groove 7 of longitudinal groove 2 and lateral trench 3.The 90% worn-down state of " 90% wear state Y90 " dactylotome groove depth H.In the present embodiment, longitudinal groove 2C, 2M and 2S comprise the darkest tread groove 7m.
The present inventor is by discovering: for cornering properties, particularly wetland performance, it is important that total circumferential edge is formed EC.This is because total circumferential edge composition EC follows wearing and tearing to understand than new product sizable increase to be arranged, in order to the wetland performance is kept the same with new product high.From new product to the wearing and tearing whole process in latter stage, the wetland performance is important, following wearing and tearing to carry out channel volume and unavoidably reduce.Therefore, need compensate reducing of channel volume by increasing total circumferential edge composition EC.Therefore, in equation (1) and (2), total circumferential edge of each wear state Y50, Y90 is formed EC50, the total circumferential edge when EC90 compares new product is formed EC00 increases to some extent.At this moment, do not limit the relation between EC50 and the EC90 especially, wish EC50≤EC90, and require to satisfy EC50≤EC90 further.
Consider tractive property, particularly consider upward performance of snow, it is important that line shaft is formed EL to the edge, and wishes that it is bigger, and it is similar that this and total circumferential edges are formed EC.Yet, to guarantee to reach 50% worn-down snow in the Tire used in winter and go up performance.Therefore, performance does not need to guarantee as the wetland performance high on the snow after 50% wearing and tearing.Therefore, the line shaft of the line shaft of each wear state Y50, Y90 when the edge is formed EL50, EL90 than new product formed the EL00 increase more than 0.5 times to the edge in equation (3) and (4).At this moment, consider EL50 and EL90,, wish to guarantee that EL90 is not less than 0.6 times of EL50 and further is not less than 0.7 times for improving performance on the snow after 90% wearing and tearing as far as possible.
In this regard, in conventional tire, form EC90 in total circumferential edge of 90% wear state Y90 and be not more than 80% of total circumferential edge composition EC00 (new product state Y00), and line shaft is not more than line shaft to edge composition EL90 and forms 30% of EL00 (new product state Y00) to the edge, is extremely low therefore.
As above illustrated, can not need to guarantee to find out that follow wearing and tearing to carry out, performance is different with the importance of wetland performance on the snow from performance on the snow after 50% wearing and tearing as the equally high fact of wetland performance.Therefore, go up performance and wetland performance, need form EC and the ratio EC/EL of line shaft between edge composition EL in each wear stage Y50, the total circumferential edge of Y90 balance for show snow in the mode of complete equilibrium.Therefore, limit in EC50/EL50 and the particular range of EC90/EL90 in equation (3) and (4).
In this regard, can degenerate less than the wetland performance of 1.5,50% wear stages than EC50/EL50 when above-mentioned.This is because circumferential edge composition reduces relatively, makes that the earth-grasping force when rotating reduces.On the other hand, when its greater than 2.2 the time, performance can be degenerated on the snow of 50% wear stage.This is because axial edge is formed reduces relatively and tractive property degeneration when avenge startup.Therefore be preferably than the lower limit of EC50/EL50 and be not less than 2.0.
When than EC90/EL90 less than 2.5 the time, the wetland performance of 90% wear stage can be degenerated.This is because circumferential edge composition reduces relatively, makes that the earth-grasping force when turning to reduces.On the other hand, when its greater than 3.5 the time, not only performance but also wetland performance all can be degenerated on the snow of 90% wear stage.Therefore be preferably than the lower limit of EC90/EL90 and be not less than 2.7, and its higher limit is preferably and is not more than 3.4 simultaneously.
For satisfying aforesaid equation (1) to (6), present embodiment is set to form tread groove 7, is formed with in 50% wear state Y50 worn-down, 50% wearing and tearing trench portions 12 with in 90% wear state Y90 worn-down, 90% wearing and tearing trench portions 13.
Because more shallow than the darkest tread groove 7m, 50% wearing and tearing trench portions 12 is in 50% wear state Y50 wearing and tearing.Like this, its channel bottom B12 is included in the shallow trench part that is exposed to tread surface TS50 under 50% wear state.More specifically be that as shown in figure 12, its gash depth H1 is not more than 50% of deep trench depth H.Yet, when it is too shallow, its will be in early days stage wearing and tearing and make effect of the present invention fully not present, so this gash depth H1 is made as 40 to 50% of deep trench depth H, more preferably 45 to 50%.In addition, 90% wearing and tearing trench portions 13 is the shallow trench parts that are exposed to tread surface 90 at 90% wear state lower groove bottom B13.Its gash depth H2 is made as and is not more than 90% of deep trench depth H, is preferably 80% to 90%, and more preferably 85 to 90%.
Wearing and tearing trench portions 12,13 can be arranged on the appropriate location of longitudinal groove 3 and lateral trench 4, and single longitudinal groove 3 and lateral trench 4 are whole can form wearing and tearing trench portions 12,13.In the present embodiment, as shown in figure 10, it is interior distolateral that 50% wearing and tearing trench portions 12 is formed on the tire axial of the middle body side of intermediate lateral groove 3M and outer lateral trench 3S.The wherein layout of 90% wearing and tearing trench portions 13,50% wearing and tearing trench portions 12 of the outer end of lateral trench 3S outside tire axial outside adjacency is arranged on also is shown.
When these grooves disappeared, external block 4S became continuous spine's shape.
In this way, follow wearing and tearing to carry out, wearing and tearing trench portions 12,13 can freely be got rid of the edge as lateral edges and end margin, thereby can satisfy equation (1) to (6).In this regard, as shown in figure 14, the 50% wearing and tearing trench portions 12 that is arranged on intermediate lateral groove 3M place is formed with sipes per tire 16 at the channel bottom B12 that is parallel to lateral trench 3M.In this example, can increase the circumferential edge that is constituted by two end margin R12 by the loss of for example eliminating lateral edges Q12 and form ec by the appearance of narrow groove 16.
In this regard, heavy-duty pneumatic tire according to the present invention is not limited to above-mentioned layout, but can differently change in the described scope of claim.
Embodiment 1
Manufacturing dimension is 11R22.5 and the heavy-duty pneumatic tire (table 1) with tread contour shown in Figure 1, and assesses corresponding performance.Assessment result is shown in table 3.In this regard, the r coefficient is listed in the table 2.
The various test conditions that are shown in table 1 are as follows.In each test, rim size is 7.50 * 22.5, and interior pressure 800kPa and the vehicle that is adopted are daily output 10 tons of load-carrying 2-D type vehicles (half load is loaded in the forebody in compartment).
(1) wetland rotating property
Place: Sumitomo Rubber Industrie. Ltd (Sumitomo Rubber Industries, Okayama test runway Ltd).
Method: will be that lap time is expressed as inverse with respect to the ratio of comparing embodiment 1 on 30 meters the runway at the radius of wetland state.The value defined of comparing embodiment 1 is 100, and value is big more, favourable more.
(2) wetland tractive property
Place: Sumitomo Rubber Industrie. Ltd (Sumitomo Rubber Industries, Okayama test runway Ltd).
Method: will be inverse in the time representation of the specific region on the runway of wetland state with respect to the ratio of comparing embodiment 1.The value defined of comparing embodiment 1 is 100, and value is big more, favourable more.
(3) wetland deceleration and stopping performance
Place: Sumitomo Rubber Industrie. Ltd (Sumitomo Rubber Industries, Okayama test runway Ltd).
Method: enter the zone, road surface of wetland state with the speed of 60km/h, will be expressed as inverse from braking to the operating range that stops with respect to the ratio of comparing embodiment 1.The value defined of comparing embodiment 1 is 100, and value is big more, favourable more.
(4) noise test
Place: Sumitomo Rubber Industrie. Ltd (Sumitomo Rubber Industries, echoless vehicle research department Ltd).
Method: adopt cydariform noise test equipment.Measure the noise that produces with 70km/h at 7.5 meters microphone position.
Rim size: 7.50 * 22.5
The interior pressure: 800kPa
(5) anti-eccentric wear decreases performance
Adopt 2-D4 molding box formula truck to realize travelling, the operating range of necessary place-exchange is that 100 index ratio is tried to achieve with the tire running distance definition of comparing embodiment 1 when producing eccentric wear and decreasing.
(6) abrasion resistance properties
Under the loading condition of constant load (10t), adopt 2-D4 molding box formula travelling truck 40,000km.Calculate the abrasion resistance properties index based on finishing the remaining groove in back that travels, be used for comparison.In this test, the abrasion resistance properties index is the index ratio of the value of (gash depth of the gash depth/new product after the wearing and tearing of new product gash depth) in the testing tire, and wherein the tire of comparing embodiment 1 is defined as 100.
Table 1
Table 2
Table 3
| Embodiment 1 | |
Comparing embodiment 1 | Comparing |
Comparing |
|
| The wetland turning efficiency | 115 | 108 | 100 | 98 | 98 |
| The wetland tractive property | 110 | 112 | 100 | 102 | 96 |
| The wetland deceleration and stopping performance | 108 | 110 | 100 | 102 | 98 |
| The noise test result | 68.0dB | 67.0dB | 68.0dB | 67.0dB | 66.8dB |
| Anti-eccentric wear decreases performance | 103 | 102 | 100 | 102 | 102 |
| Abrasion resistance properties | 102 | 101 | 100 | 102 | 101 |
Manufacturing dimension is 11R22.5 and the heavy-duty pneumatic tire with tread contour shown in Figure 1, and assesses corresponding performance.Assessment result is shown in table 4.The various test modes that are shown in table 4 are as follows.In each test, rim size is 7.50 * 22.5, and interior pressure 800kPa and the vehicle that is adopted are 10 tons of load-carrying 2-D4 vehicles (half load is loaded in the forebody in compartment).
(1) wet earth-catching property
Place: Sumitomo Rubber Industrie. Ltd (Sumitomo Rubber Industries, Okayama test runway Ltd).
Method: be the radius at the wetland state that lap time is expressed as inverse with respect to the ratio of comparing embodiment 1 on 30 meters the runway.The value defined of comparing embodiment 1 is 100, and value is big more, favourable more.
(2) anti-eccentric wear decreases performance
Operating range: 40,000km
Appraisal procedure: under the loading condition of constant load (10t), adopt 2-D4 molding box formula travelling truck 40,000km.Calculate the abrasion resistance properties index based on finishing the remaining groove in back that travels, be used for comparison.
Wear-resistant property index: the value of (new product gash depth wearing and tearing after gash depths)/(gash depth of new product) of testing tire is compared with the value of controlling tire.
Table 4
Specification manufacturing dimension according to table 5 is 11R22.5 and the heavy-duty pneumatic tire with tread contour shown in Figure 1, and assess performance and wetland performance on the snow of each embodiment tire at new product state, 50% wear state and 90% wear state respectively, the results are shown in table 5.
In this regard, the length L 1 formed to the edge with the line shaft of the new product of comparing embodiment 1 in comparing embodiment 1 of the value of the EL00 in the table 5, EL50 and EL90 is defined as 100 index expression.Similarly, these values are defined as 100 index expression with the length L 2 that the line shaft of the new product of comparing embodiment 2 is formed to the edge in comparing embodiment 2, the length L of forming to the edge with the line shaft of the new product of embodiment 1 in embodiment 13 is defined as 100 index expression, and the length L of forming to the edge with the line shaft of the new product of embodiment 3 at embodiment 34 is defined as 100 index expression.
And the EC00 in the table 1, EC50 and EC90 are defined as 100 index expression with the length C 1 that total circumferential edge of the new product of comparing embodiment 1 is formed in comparing embodiment 1.Similarly, these values are defined as 100 index expression with the length C 2 that total circumferential edge of the new product of comparing embodiment 2 is formed in comparing embodiment 2, the length C of forming with total circumferential edge of the new product of embodiment 1 in embodiment 13 is defined as 100 index expression, and the length C of forming with total circumferential edge of the new product of embodiment 3 in embodiment 34 is defined as 100 index expression.
The tread surface situation of each wear state of the tire of embodiment 1 is shown in Fig. 7, and the tread surface situation of each wear state of the tire of comparing embodiment 1 is shown in Fig. 8.
(1) performance on the snow
Tire installs to all wheels of vehicle (maximum load is the 2-D type vehicle of 8t) under the condition of wheel rim (7.50 * 22.5) and interior pressure (800kPa), vehicle is starting from halted state on the gradient of 10% degree under the snowfield environment of compacting under constant load, and measures at each wear state (new product state, 50% wear state, 90% wear state) time of the 10m that travels.For each wear state, the inverse of the time of surveying is 100 index expression with the value defined of comparing embodiment 1.Be worth greatly more, tractive property is good more on the snow.
(2) wetland performance
Adopting vehicle same as described above to measure the radius at the wetland environment under the wear state is lap time on 30 meters the runway, and the value of each wear state is 100 index expression with the value defined of comparing embodiment 1 with the inverse of survey time.Be worth greatly more, the wetland performance is good more.
Table 5
Claims (3)
1. heavy-duty pneumatic tire comprises:
Be arranged at least five longitudinal grooves on the tread surface (TS), described at least five longitudinal grooves comprise: one and tire equator (Q) intersect and be the central longitudinal groove (2C) that zigzag extends, the outer longitudinal groove (2S) that is positioned at the tire axial outside and central longitudinal groove (2C) and outside the middle longitudinal groove (2M) of extension between the longitudinal groove (2S), and
Connect described central longitudinal groove (2C) and middle longitudinal groove (2M) central lateral trench (3C), be connected described in the middle of longitudinal groove (2M) and outer longitudinal groove (2S) intermediate lateral groove (3M) and outside described longitudinal groove (2S) extend to the outer lateral trench (3S) of tyre surface end (E)
Adopt the piece decorative pattern of at least three types of pieces, described three types piece comprises: the central block (4C) that is separated into by described central longitudinal groove (2C), middle longitudinal groove (2M) and central lateral trench (3C), the intermediate mass (4M) that is separated into by middle longitudinal groove (2M), outer longitudinal groove (2S) and intermediate lateral groove (3M), and the external block (4S) that is divided into by outer longitudinal groove (2S), outer lateral trench (3S) and tyre surface end parts, and
Satisfy following four equations:
(L4S/W4S)<(L4M/W4M)<(L4C/W4C)
1.50<L4C/W4C<1.80
1.30<L4M/W4M<1.65
0.90<L4S/W4S<1.10，
Wherein, the longitudinal length of central block, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each central block is defined as L4C,
The longitudinal length of intermediate mass, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each intermediate mass is defined as L4M,
The longitudinal length of external block, promptly the tire circumferential distance between the most outstanding end points of the circumferential both sides of tire of each external block is defined as L4S,
The lateral length of central block, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each central block is defined as W4C,
The lateral length of intermediate mass, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each intermediate mass is defined as W4M,
The lateral length of external block, promptly the tire axial distance between the most outstanding end points of the tire axial both sides of each external block is defined as W4S,
The lengthwise ratio of central block (4C) is defined as (L4C/W4C),
The lengthwise ratio of intermediate mass (4M) is defined as (L4M/W4M), and
The lengthwise ratio of external block (4S) is defined as (L4S/W4S),
And satisfy following three equations:
0.85<w2C/w3C<1.30
0.85<w2M/w3M<1.10
0.9<w2S/w3S<1.10，
Wherein, with the rectangular direction of groove line of centers on the groove width of the central longitudinal groove (2C) measured be defined as w2C,
The groove width of middle longitudinal groove (2M) in the same direction is defined as w2M,
The groove width of outer longitudinal groove (2S) in the same direction is defined as w2S,
The groove width of central lateral trench (3C) in the same direction is defined as w3C,
The groove width of intermediate lateral groove (3M) in the same direction is defined as w3M, and
The groove width of outer lateral trench (3S) in the same direction is defined as w3S.
2. heavy-duty pneumatic tire as claimed in claim 1, wherein, the groove width w2M of the groove width w2C of central longitudinal groove (2C), middle longitudinal groove (2M) and the groove width w2S of outer longitudinal groove (2S) satisfy
w2C<w2M<w2S。
3. heavy-duty pneumatic tire as claimed in claim 1 or 2, wherein, the groove width w3M of the groove width w3C of central lateral trench (3C), intermediate lateral groove (3M) and the groove width w3S of outer lateral trench (3S) satisfy
w3C<w3M<w3S。
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004334903A JP4355276B2 (en) | 2004-11-18 | 2004-11-18 | Heavy duty pneumatic tire |
| JP2004334903 | 2004-11-18 | ||
| JP2004336567 | 2004-11-19 | ||
| JP2004336568 | 2004-11-19 |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101431278A Division CN101574903B (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
| CN2009101431282A Division CN101574904B (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1781741A CN1781741A (en) | 2006-06-07 |
| CN100500456C true CN100500456C (en) | 2009-06-17 |
Family
ID=36623149
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101236489A Expired - Fee Related CN100500456C (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
| CN2009101431282A Expired - Fee Related CN101574904B (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
| CN2009101431278A Expired - Fee Related CN101574903B (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101431282A Expired - Fee Related CN101574904B (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
| CN2009101431278A Expired - Fee Related CN101574903B (en) | 2004-11-18 | 2005-11-18 | Heavy duty pneumatic tire |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4355276B2 (en) |
| CN (3) | CN100500456C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802608A (en) * | 2012-11-09 | 2014-05-21 | 住友橡胶工业株式会社 | Pneumatic tire |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4866177B2 (en) * | 2006-08-28 | 2012-02-01 | 住友ゴム工業株式会社 | Heavy duty tire |
| JP5612848B2 (en) * | 2009-11-18 | 2014-10-22 | 株式会社ブリヂストン | tire |
| JP5771398B2 (en) | 2011-01-11 | 2015-08-26 | 株式会社ブリヂストン | Pneumatic tire |
| WO2012127839A1 (en) * | 2011-03-23 | 2012-09-27 | 株式会社ブリヂストン | Pneumatic tire |
| ITTO20110471A1 (en) * | 2011-05-30 | 2012-12-01 | Bridgestone Corp | METHOD FOR DETERMINING THE LONGITUDINAL STEP OF THE BLOCKS OF A TREAD STRIP |
| JP5739862B2 (en) * | 2012-12-26 | 2015-06-24 | 住友ゴム工業株式会社 | Heavy duty pneumatic tire |
| JP5835399B2 (en) * | 2014-05-02 | 2015-12-24 | 横浜ゴム株式会社 | Pneumatic tire |
| JP6097263B2 (en) * | 2014-09-25 | 2017-03-15 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP6130822B2 (en) * | 2014-11-20 | 2017-05-17 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP6235985B2 (en) * | 2014-11-06 | 2017-11-22 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP6393162B2 (en) * | 2014-11-21 | 2018-09-19 | 住友ゴム工業株式会社 | Heavy duty pneumatic tire |
| JP6178808B2 (en) * | 2015-01-06 | 2017-08-09 | 住友ゴム工業株式会社 | Heavy duty pneumatic tire |
| JP6387123B2 (en) * | 2017-01-11 | 2018-09-05 | 住友ゴム工業株式会社 | Heavy duty pneumatic tire |
| JP7159827B2 (en) * | 2018-12-04 | 2022-10-25 | 住友ゴム工業株式会社 | tire |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4573984B2 (en) * | 1999-11-10 | 2010-11-04 | 住友ゴム工業株式会社 | Pneumatic radial tire |
| GB2376217B (en) * | 2001-06-06 | 2005-03-02 | Yokohama Rubber Co Ltd | Pneumatic tire |
| JP4278955B2 (en) * | 2002-10-23 | 2009-06-17 | 株式会社ブリヂストン | Pneumatic tire |
| JP2004299592A (en) * | 2003-03-31 | 2004-10-28 | Bridgestone Corp | Pneumatic tire |
-
2004
- 2004-11-18 JP JP2004334903A patent/JP4355276B2/en not_active Expired - Fee Related
-
2005
- 2005-11-18 CN CNB2005101236489A patent/CN100500456C/en not_active Expired - Fee Related
- 2005-11-18 CN CN2009101431282A patent/CN101574904B/en not_active Expired - Fee Related
- 2005-11-18 CN CN2009101431278A patent/CN101574903B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802608A (en) * | 2012-11-09 | 2014-05-21 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN103802608B (en) * | 2012-11-09 | 2017-12-19 | 住友橡胶工业株式会社 | Pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006142959A (en) | 2006-06-08 |
| CN1781741A (en) | 2006-06-07 |
| CN101574903B (en) | 2011-09-28 |
| CN101574904A (en) | 2009-11-11 |
| CN101574904B (en) | 2011-05-18 |
| JP4355276B2 (en) | 2009-10-28 |
| CN101574903A (en) | 2009-11-11 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090617 Termination date: 20201118 |