CN102310723B - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
CN102310723B
CN102310723B CN201110157391.4A CN201110157391A CN102310723B CN 102310723 B CN102310723 B CN 102310723B CN 201110157391 A CN201110157391 A CN 201110157391A CN 102310723 B CN102310723 B CN 102310723B
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CN
China
Prior art keywords
tire
major trough
central
translot
groove
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Application number
CN201110157391.4A
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Chinese (zh)
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CN102310723A (en
Inventor
山川贵弘
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Publication of CN102310723A publication Critical patent/CN102310723A/en
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Classifications

    • 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
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • 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
    • B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
    • 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
    • B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction
    • 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
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • 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
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • 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
    • B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • 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
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B60C2011/0372—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane with particular inclination angles
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1231—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe being shallow, i.e. sipe depth of less than 3 mm
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C2011/1245—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern being arranged in crossing relation, e.g. sipe mesh
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C2011/129—Sipe density, i.e. the distance between the sipes within the pattern

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

The invention provides a pneumatic tire, which has directional patterns and achieves improved wet performance, snow performance and nonuniform wear resistance. The central portion (C) of the pneumatic tire is divided into multiple pattern blocks (5) via a central main groove (1), outer main grooves (2) and transverse grooves (3). Meanwhile, the strip-shaped patterns (5) at the tire shoulder portion (S) is provided with shoulder pattern grooves (4). The patterns of the pneumatic tire are directional patterns. The transverse grooves (3) are formed at two sides of the central main groove (1) in the tire width direction and is reversely inclined relative to the tire equator, wherein the central inclined angle Theta1 of the transverse grooves (3) is an acute angle. Meanwhile, the transverse grooves (3) are formed at two sides of the central main groove (1) in the tire width direction and the tire circumferential direction in a staggered manner such that the circumferential portion (3') formed by upward projection of the transverse grooves (3) in the tire circumferential direction is provided at the periphery of the tire. In addition, sipes (7) are provided at the pattern blocks (5) and the strip-shaped patterns (6).

Description

Pneumatic tire
Technical field
The present invention relates to a kind of pneumatic tire, more specifically, relate to one and can improve wetland performance and snowfield performance, and the pneumatic tire of resistance to uneven wear can be improved.
Background technology
As everyone knows, utilize many major troughs extended along tire circumference, with many translots extended along tire width direction, tire is divided into multiple pattern block, excellent snowfield performance and drainage performance can be had.In this pneumatic tire, for obtaining higher drainage performance, directional tread decorative pattern can be adopted on tyre surface.Such as patent document 1 proposes, and tread contour is formed as directionality decorative pattern, and directionality decorative pattern is provided with many major troughs circumferentially and many tire shoulder pattern grooves tilting to extend along tire width direction and sipes per tire.
On the other hand, the wearing character of tire is different and different from trailing wheel and installation site because of vehicle front-wheel, therefore needs installation site of rotating at regular intervals, with the wearing and tearing of each tire of equilibrium, increases the service life.But, if tire has the directional tread decorative pattern specifying tire rotation direction, then because tire rotation direction is fixed, so tire changing can only be carried out between the front and back wheel that vehicle both sides are installed on the same side during rotation.Therefore, tire compared with heavy load is born for the such shoulder portion when rotated of light truck tire, when adopting above-mentioned directional tread decorative pattern, just can only between the front and back wheel of the same side rotation tire, thus the uneven wear of shoulder portion cannot be suppressed by rotation tire.In addition, for suppressing uneven wear, its effective ways reduce translot and improve pattern block rigidity, but now may reduce snowfield performance.Therefore, wetland performance, snowfield performance and resistance to uneven wear are difficult to be taken into account.
Prior art document
Patent document
[patent document 1] Japanese Patent Laid-Open 2007-161114 publication
Summary of the invention
The problem that invention quasi-solution is determined
The object of the invention is to solve the problem, and one therefore will be provided to have directionality decorative pattern, can improve wetland performance and snowfield performance, and can improve the pneumatic tire of resistance to uneven wear.
For the pneumatic tire of the present invention reaching above-mentioned purpose is provided with in tire equator along the central major trough that tire circumference extends on tyre surface, be positioned at these central major trough tire width direction both sides and at least 2 the outside major troughs extended along tire circumference, and extend and many translots be communicated with described central major trough and described outside major trough along tire width direction between described central major trough and described outside major trough, utilize these central major troughs, outside major trough and translot, multiple pattern block is marked off at central portion, shoulder portion simultaneously outside the tire width direction of outermost outside major trough, arrange and extend and the tire shoulder pattern groove that is communicated with of not outermost with this outside major trough along tire width direction, strip decorative pattern is formed in this shoulder portion, it is characterized in that, described pneumatic tire is directionality decorative pattern, the described translot being positioned at tire width direction both sides relative to described central major trough is relative to the mutual reversed dip of tire equator, described translot and described central major trough connectivity part be set to acute angle with tire circumference angulation and central lopsidedness angle θ 1, the circumferential portion simultaneously projected in tire circumference according to described translot is present in the all-round mode of tire, tire circumference is in staggered configuration the described translot being positioned at described central major trough tire width direction both sides, and on described pattern block and described strip decorative pattern, sipes per tire is set.
The effect of invention
According to the present invention, because the translot being positioned at tire width direction both sides relative to central major trough is relative to the mutual reversed dip of central tire major trough, this translot becomes central lopsidedness angle θ 1 to be set to acute angle with central major trough connectivity part with tire circumference, therefore can improve wetland performance and snowfield performance.Especially, because the circumferential portion projected in tire circumference according to translot is present in the all-round mode of tire, tire circumference is in staggered configuration the translot being positioned at central major trough tire width direction both sides, therefore can improves wetland performance during tyre rotation.In addition, owing to arranging and the disconnected tire shoulder pattern groove of outermost outside major trough in shoulder portion, therefore resistance to uneven wear can be improved.Thus, the tire with directionality decorative pattern while raising wetland performance and snowfield performance, can improve resistance to uneven wear.
In the present invention, preferably form at the position that is communicated with of translot and central major trough the convex stria portion, the end that groove depth and groove width be less than described other positions of translot, the groove depth in convex stria portion, this end is set to 40 ~ 60% of central major trough groove depth, and groove width is set to 30 ~ 50% of the maximum groove width of translot.Thus, while guaranteeing drainage performance, the pattern block rigidity of central portion can be increased, improve the resistance to uneven wear of central portion.
In the present invention, preferred central lopsidedness angle θ 1 compared with translot and outside major trough connectivity part with tire circumference angulation and tire shoulder lopsidedness angle θ 2 relative less.Thus, will the drainage performance of translot be improved, thus the drainage performance decreased because arranging convex stria portion, the end can be made up.More preferably tire shoulder lopsidedness angle θ 2 is 5 ~ 30 ° with the difference of central lopsidedness angle θ 1.Thus, can further improve the drainage performance of translot.In addition, preferred central lopsidedness angle θ 1 is 40 ~ 65 °, thus, while raising drainage performance, can improve mar proof.
In the present invention, preferably arrange fine groove on the surface of pattern block, the spacing of this fine groove is set to 2.5 ~ 5mm simultaneously, and the degree of depth is set to 0.1 ~ 0.8mm, and width is set to 0.1 ~ 0.8mm.Thus, wetland performance and snowfield performance can be improved.
In the present invention, preferably in the tire width direction inner side edge edge of strip decorative pattern, interval or continuously configuration have multiple chamfered section of chamfered edge amount this shape of cyclically-varying in tire circumference.Thus, edge amount can be increased, improve wetland performance.
In the present invention, the tilt angle theta 3 of preferred tire shoulder pattern groove and tire circumference is 90 ± 10 °.Thus, strip decorative pattern rigidity can be guaranteed, improve mar proof.
In the present invention, the JIS A type hardness tester of rubber at-10 DEG C being preferably formed fetus face is 55 ~ 70.Thus, by the rigidity control of pattern block and strip decorative pattern in proper range, resistance to uneven wear can be improved, and improves snowfield performance.
In addition, preferred above-mentioned each pneumatic tire is as the light truck tire used under the above condition of air pressure 350kPa.
Accompanying drawing explanation
Fig. 1 is the air tread front view according to the embodiment of the present invention.
Pattern block adjacent with central major trough in pneumatic tire shown in Fig. 1 is amplified the front view shown by Fig. 2.
Fig. 3 is key diagram central portion airtyred shown in Fig. 1 being amplified display.
Fig. 4 is by the plane of shoulder portion strip decorative pattern local enlargement display in pneumatic tire shown in Fig. 1.
Fig. 5 is the side view of pattern block adjacent with central major trough in pneumatic tire shown in Fig. 2.
Fine groove set on pattern block adjacent with central major trough in pneumatic tire shown in Fig. 2 is amplified the profile shown by Fig. 6.
Fig. 7 is the side view of airtyred shoulder portion strip decorative pattern shown in Fig. 4.
Description of reference numerals
1 central major trough
Major trough outside 2
3 translots
Convex stria portion at the bottom of 3a
4 tire shoulder pattern grooves
5 pattern blocks
6 strip decorative patterns
7 sipes per tires
8 fine grooves
9 chamfered section
Detailed description of the invention
In pneumatic tire of the present invention shown in Fig. 1, tyre surface T is provided with and is positioned on tire equator E and 1 the central major trough 1 extended along tire circumference, and is positioned at these central major trough 1 both sides and 2 the outside major troughs 2 extended along tire circumference.Many translots 3, according to by these central major troughs 1 and the mode tilting to be communicated with between outside major trough 2, configure along tire circumference interval.The structure of central authorities' major trough 1 is elongate in shape, contains transmission part when tire circumference projects.In addition, on the shoulder portion S in the outside of outside major trough 2, along the interval configuration of tire circumference containing the tire shoulder pattern groove 4 of end, its from tire shoulder edge laterally major trough 2 extend, and not to be connected with outside major trough 2.So, at the central portion C of the inner side of outside major trough 2, the pattern block row that 2 row are formed by multiple pattern block 5 will be divided into.And the shoulder portion S in outside at outside major trough 2, then formed and there is multiple strip decorative pattern 6 containing end tire shoulder pattern groove 4.On the surface of these pattern blocks 5 and strip decorative pattern 6, be provided with and be respectively zigzag and many sipes per tires 7 extended along tire width direction on plane angle.
Be arranged at the major trough quantity circumferentially on tyre surface T, be not limited in 1 central major trough 1 shown in Fig. 1 and 2 outside major troughs 23.In addition, there is no particular restriction for the shape of sipes per tire 7, as long as be formed as extending along tire width direction.
In the airtyred tread contour of the present invention, the translot 3 being positioned at tire width direction both sides relative to central major trough 1 is relative to the mutual reversed dip of tire equator E, thus becomes directionality decorative pattern.This directionality decorative pattern had to the translot 3 of tire peripheral, oblique and the tire shoulder pattern groove 4 containing end, owing to having the prolongation along tire circumference and the prolongation along tire width direction, therefore can when embedding snow, play braking and driving effect before and after vehicle simultaneously, and prevent from laterally breakking away effect.But this directionality decorative pattern, can only between the front and back wheel of vehicle the same side rotation tire, therefore when shoulder portion S configure pattern block row time, will increase heel-and-toe wear, be difficult to suppression uneven wear.But as shown in Figure 1, by arranging the tire shoulder pattern groove 4 containing end at shoulder portion S, this tire shoulder pattern groove 4 is not communicated with outside major trough 2, and on shoulder portion S, circumferentially form ring shore divide continuous print strip decorative pattern 6, the variation in rigidity of shoulder portion S in tire circumference can be reduced, suppress the uneven wear of shoulder portion S.
As shown in Figure 2, central lopsidedness angle θ 1 is called by translot 3 and central major trough 1 connectivity part with tire circumference angulation.This central lopsidedness angle θ 1 is set to acute angle.Central authorities lopsidedness angle θ 1 is preferably 40 ~ 65 °.Herein, central lopsidedness angle θ 1 is groove width center line and the tire circumference angulation of translot 3.So, by central lopsidedness angle θ 1 is set to acute angle, except the effect of above-mentioned inclination translot 3, also can further improve drainage performance, and improve resistance to uneven wear.If central authorities lopsidedness angle θ 1 is more than 65 °, then outside major trough 2 one side end of pattern block can become acute angle, thus easily produces the problems such as heel-and-toe wear, and resistance to uneven wear is by insufficient.On the other hand, if central lopsidedness angle θ 1 is less than 40 °, then fully drainage performance cannot be improved.
In addition, the circumferential portion projected in tire circumference according to translot 3 is present in the all-round mode of tire, and tire circumference is in staggered configuration the translot 3 being positioned at central major trough 1 tire width direction both sides.That is, as shown in Fig. 3 key diagram, owing to being in staggered configuration the translot 3 being positioned at central major trough 1 tire width direction both sides in the circumferential, therefore the circumferential portion 3 ' of these translots 3 staggers in the circumferential.So, in pattern block row, there is no the place of translot 3 circumferential portion 3 ', by translot 3 circumferential portion in another pattern block of configuration row.Therefore, the circumferential portion 3 ' of central major trough 1 tire width direction both sides complements each other, and repeats to be connected on tire is all-round.So, be present in tire by circumferential portion 3 ' all-round, wetland performance during tyre rotation can be improved.There is no particular restriction for the displaced manner of translot 3, and preferred translot 3 is in the both sides of central major trough 1, and stagger half pitch in the circumferential respectively.
As shown in Figure 4, what shoulder portion S is arranged is extend along tire width direction containing end tire shoulder pattern groove 4.The tilt angle theta 3 of itself and tire circumference is preferably within the scope of 90 ± 10 °.In addition, the tire shoulder pattern groove 4 be positioned on the shoulder portion S of tire width direction both sides can relative to the mutual reversed dip of tire equator E.So, by the incline direction of tire shoulder pattern groove 4 is set to tire width direction, strip decorative pattern rigidity can be guaranteed, improve mar proof.If tilt angle theta 3 departs from 90 ± 10 ° of scopes, mar proof is by insufficient.Herein, tilt angle theta 3 is groove width center line and tire circumference angulations of tire shoulder pattern groove 4.
By arranging sipes per tire 7 on the surface of pattern block 5 and strip decorative pattern 6, wetland performance can be improved.Sipes per tire 7 preferably extends to the end of pattern block or strip decorative pattern.By the end making sipes per tire 7 extend to pattern block or strip decorative pattern, sipes per tire edge can be utilized to improve wetland performance.Sipes per tire 7 in pattern block and strip decorative pattern is all preferred within the scope of 90 ± 10 ° with the tilt angle theta 4 of tire circumference.By being set within the scope of this by the angle of inclination of sipes per tire 7, wetland braking ability can be improved.Particularly by extending the sipes per tire 7 be located on strip decorative pattern 6 along tire width direction, the bad wetland braking ability caused because tire shoulder pattern groove 4 is not communicated with outside major trough 2 can be made up.
As shown in figures 2 and 5, convex stria portion 3a at the bottom of the formation of position is communicated with at translot 3 and central major trough 1.Convex stria portion, this end 3a is the part that place's groove depth and groove width are all less than other positions of translot 3.The length L3a of convex stria portion, this end 3a is be set to translot 3 length L3 20 ~ 40%.In addition, the groove width W3a of the end convex stria portion 3a is be set to the maximum groove width W3 of translot 3 30 ~ 50%, and the groove depth D3a of the end convex stria portion 3a is be set to central major trough 1 groove depth D1 40 ~ 60%.Herein, the length L3 of translot 3 is that translot 3 is from central major trough 1 one side end to the length of outside major trough 2 one side end.In addition, the length L3a of the end convex stria portion 3a is the length between translot 3 and central major trough 1 one side end.These are all the length along groove width central line measurement.
As mentioned above, by being communicated with convex stria portion 3a at the bottom of the formation of position at translot 3 and central major trough 1, and reducing groove width W3a and the groove depth D3a of translot 3, the pattern block rigidity near convex stria portion, end 3a can be improved, suppress uneven wear.Further, raising and reduced width because translot 3 has carried out bottom simultaneously, therefore when improving pattern block rigidity, the connected state of translot 3 and central major trough 1 can be guaranteed.Therefore, by the acting in conjunction of central major trough 1 with translot 3, can well maintained drainage performance.
Now, by the length L3a of convex for end stria portion 3a is set to 20 ~ 40% of translot 3 length L3, can uneven wear be suppressed, and snowfield control stability can not be reduced.If the length L3a of convex stria portion, end 3a is less than 20% of translot 3 length L3, the improvement effect suppressing uneven wear fully cannot be obtained.On the contrary, if the length L3a of convex stria portion, end 3a is greater than 40% of translot 3 length L3, then the effect of the snowfield control stability that cannot fully be improved.
By the translot 3 groove depth D3a at 3a place of convex for end stria portion is set to 40 ~ 60% of central major trough 1 groove depth D1, can uneven wear be suppressed, and snowfield control stability can not be reduced.If the ratio of the end convex stria portion 3a groove depth D3a and central major trough 1 groove depth D1 is less than 40%, although the effect improving resistance to uneven wear can be obtained, the effect of cannot fully be improved drainage performance and row's snow performance.On the contrary, if this ratio is greater than 60%, then fully cannot reduce poor rigidity, the effect of the resistance to uneven wear that cannot fully be improved.
By the translot 3 groove width W3a at 3a place of convex for end stria portion is set to 30 ~ 50% of the maximum groove width W3 of translot 3, can uneven wear be suppressed, and snowfield control stability can not be reduced.If the ratio of the end convex stria portion 3a groove width W3a and the maximum groove width W3 of translot 3 is less than 30%, although the effect improving resistance to uneven wear can be obtained, the effect of cannot fully be improved drainage performance and row's snow performance.On the contrary, if this ratio is greater than 50%, then pattern block rigidity not too large change, the effect of the resistance to uneven wear that cannot fully be improved.
As shown in Figure 2, tire shoulder lopsidedness angle θ 2 is set to by translot 3 and outside major trough 2 connectivity part with tire circumference angulation.Preferred central lopsidedness angle θ 1 is relative compared with tire shoulder lopsidedness angle θ 2 less.Thus, the drainage performance of translot 3 can be improved.Therefore, as mentioned above, after convex stria portion, end translot 3 groove depth and groove width reduced 3a is set, also drainage performance can be maintained for improving resistance to uneven wear.Central authorities lopsidedness angle θ 1 is preferably 5 ~ 30 ° with the difference of tire shoulder lopsidedness angle θ 2.If this difference is less than 5 °, drainage performance cannot improve.On the contrary, if this difference is greater than 30 °, pattern block rigidity will decline, and be difficult to suppress uneven wear.Herein, tire shoulder lopsidedness angle θ 2 is groove width center line and tire circumference angulations of translot 3.
In pneumatic tire of the present invention, preferably on each tread of pattern block 5, configured in parallel is toward many fine grooves 8 of tire peripheral, oblique.These fine grooves 8 are minute grooves more shallow compared with sipes per tire 7.During new tire, owing to failing to play the original characteristic of tread-rubber, therefore its ice and snow road driving performance may not be abundant.But, by arranging this fine groove 8, fine groove 8 can be utilized effectively to remove the moisture film produced between ice and snow road and tread surface.Therefore, performance on ice and the snowfield performance at use initial stage can be improved.In addition, after pattern block 5 tread arranges fine groove 8, the existence due to these fine grooves 8 will impel tread surface cortex to come off, the effect that the time that therefore also can obtain order performance tread-rubber primary characteristic shortens to some extent.
As shown in Figure 6, the groove width w of fine groove 8 can be 0.1mm ~ 0.8mm, and groove depth d can be 0.1mm ~ 0.8mm.If the groove width w of fine groove 8 is less than 0.1mm, moisture film removal effect and row's snow performance improvement effect, by insufficient, on the contrary, if be greater than 0.8mm, then can reduce pattern block rigidity.In addition, if groove depth d is less than 0.1mm, moisture film removal effect and row's snow performance improvement effect, by insufficient, on the contrary, if be greater than 0.8mm, then can reduce pattern block rigidity.
The spacing p of fine groove 8 is preferably set within the scope of 2.5 ~ 5.0mm.By being set within the scope of this by the spacing p of fine groove 8, the fine groove 8 when tire bears high load capacity can be conscientiously avoided to be crushed.Therefore, under high-load condition, the effect improving performance and snowfield performance on ice also can be played.If the spacing p of fine groove 8 is less than 2.5mm, the performance on ice under high-load condition and snowfield performance improvement effect are by insufficient.On the contrary, if this spacing p is greater than 5.0mm, moisture film is removed and is improved effect by insufficient.
Fine groove 8 is preferably set within the scope of 40 ° ~ 60 ° with the tilt angle alpha of tire circumference.By the tilt angle alpha of fine groove 8 is set within the scope of this, can braking ability be improved and prevent tire from breakking away.If the tilt angle alpha of fine groove 8 is less than 40 °, the edge of fine groove 8 will be difficult to assist to improve braking ability, and on the contrary, if be greater than 60 °, the edge of fine groove 8 will be difficult to assistance and prevent tire from breakking away.
As shown in Fig. 4 and Fig. 7, preferably in the tire width direction inner side edge edge of strip decorative pattern 6, interval or continuously formation have multiple chamfered section 9 of chamfered edge amount this shape of cyclically-varying in tire circumference.Herein, the change of chamfered edge amount refers to that the size of width and depth direction changes along strip decorative pattern 6 circumference.As shown in Figure 4, the maximum maximum chamfered section 9a of chamfered edge amount is chamfered edge amount the best part on depth direction and width, and minimum chamfered section 9b is the part that chamfered edge amount is minimum on depth direction and width.
For the shape of chamfered section 9, to increase edge length by making the cyclically-varying in tire circumference of chamfered edge amount, increase the marginal portion that can play a role in braking with driving direction, therefore can maintain excellent snowfield performance.Chamfered section 9, if chamfered edge amount does not have change, completely impartial shape all-round, cannot increase edge length, thus the effect of the snowfield performance that cannot fully be improved.
The degree of depth D9a of maximum chamfered section 9a and/or width W 9a in this chamfered section 9, can be 30 ~ 60% of outside major trough 2 depth capacity D2.By being set within the scope of this, fully can increase edge length, improving snow traction.Be preferably 40 ~ 50% of outside major trough 2 depth capacity D2.If the degree of depth D9a of maximum chamfered section 9a and/or width W 9a is less than 30% of outside major trough degree of depth D2, the power be applied between tire shoulder pattern groove 4 and outside major trough 2 cannot be discharged, thus the effect of the resistance to uneven wear that cannot fully be improved.In addition, if the degree of depth D9a of maximum chamfered section 9a and/or width W 9a is greater than 60% of outside major trough degree of depth D2, pattern block rigidity will seriously reduce, thus the effect of the snowfield control stability that cannot fully be improved.
The maximum chamfered section 9a of chamfered section 9 as shown in Figure 4, is preferably configured in the extended line region containing end tire shoulder pattern groove 4.Containing the extended line region of end tire shoulder pattern groove 4 compared with the easier concentrated stress in other regions in strip decorative pattern 6, therefore by configuring maximum chamfered section 9a in this region, reducing rigidity, easily can disperse concentrated stress, suppress uneven wear.If depart from the extended line region of tire shoulder pattern groove 4 when configuring maximum chamfered section 9a, the extended line region of tire shoulder pattern groove 4 by easy concentrated stress, the effect of the resistance to uneven wear that cannot fully be improved.
Chamfered section 9, by containing in units of the spacing of end tire shoulder pattern groove 4, every 0.5 ~ 2 spacing can form 1 place.Herein, refer to containing the spacing of end tire shoulder pattern groove 4 adjacent containing the interval of end tire shoulder pattern groove 4 in tire circumference.The formation ratio of chamfered section 9 is if with gap-forming 1 place being less than 0.5 spacing, then chamfered section 9 quantity is too much, pattern block rigidity will be caused seriously to reduce, the effect of the resistance to uneven wear that cannot fully be improved.On the contrary, the formation ratio of chamfered section 9 if with gap-forming 1 place being greater than 2 spacing, then will form high rigidity position and low rigidity position at the edge part of strip decorative pattern 6, and poor rigidity increases, thus the effect of the resistance to uneven wear that cannot fully be improved.
The JIS A type hardness tester of rubber at-10 DEG C forming tyre surface is preferably 55 ~ 70.So, resistance to uneven wear can be improved, and improve snowfield performance.If hardness is lower than 55, the rigidity of pattern block and strip decorative pattern will decline, thus the effect of the resistance to uneven wear that cannot fully be improved.If hardness is more than 70, then the effect of the snowfield performance that cannot fully be improved.Herein, JIS A type hardness tester refers to according to JIS K6253, uses the hardness that hardometer (A type) is measured under-10 DEG C of temperature conditions.
Pneumatic tire of the present invention is preferably used as the light truck tire used under the above condition of air pressure 350kPa.
Example
Make 11 kinds of pneumatic tires of conventional example 1, comparative example 1 ~ 2, example 1 ~ 8, its tire size is all 195/75R16C, 107/105R, and different size is as shown in table 1,2.
These 11 kinds of tire sets are installed on the wheel rim of 16 × 51/2J, front-wheel pressurising 280kPa, trailing wheel pressurising 450kPa, then the Europe being mounted to dead weight 3.5 tons is respectively produced on lorry, measures resistance to uneven wear, drainage performance, wetland control stability and snowfield control stability by following method.
Resistance to uneven wear
After travelling 4000km with above-mentioned vehicle on asphalt road, visual assessment is carried out to tire appearance.Assessment result with the value of conventional example 1 for index 100 represents.This exponential quantity is less, represents that resistance to uneven wear is better.
Drainage performance
Travelling on the test road of the depth of water 10 ± 1mm, radius of turn 100m with above-mentioned vehicle, there is test vehicle travel speed during maximum lateral acceleration in measurement tire.Assessment result with the value of conventional example 1 for index 100 represents.This exponential quantity is larger, represents that drainage performance is better.
Wetland control stability
Travel on the test road of road surface slippery situation with above-mentioned vehicle, in 0 ~ 100km/h velocity interval, sensory evaluation is carried out to control stability.Assessment result with the value of conventional example 1 for index 100 represents.This exponential quantity is larger, represents that wetland control stability is better.
Snowfield control stability
Travel on the test road of road snow with above-mentioned vehicle, in 0 ~ 100km/h velocity interval, sensory evaluation is carried out to control stability.Assessment result with the value of conventional example 1 for index 100 represents.This exponential quantity is larger, represents that snowfield control stability is better.
Table 1
Conventional example 1 Comparative example 1 Comparative example 2 Example 1 Example 2 Example 3
Translot is communicated with major trough Nothing Have Nothing Have Have Have
Central authorities' lopsidedness angle θ 1 (°) 30 50 30 50 45 45
Tire shoulder lopsidedness angle θ 2 (°) 30 50 30 50 60 60
Differential seat angle θ 2-θ 1 (°) 0 0 0 0 15 15
Convex stria portion, the end Nothing Nothing Nothing Nothing Nothing Have
The width (%) in convex stria portion, the end -- -- -- -- -- 20
The degree of depth (%) in convex stria portion, the end -- -- -- -- -- 30
The circumferential portion of translot Discontinuous Discontinuous Discontinuous Continuously Continuously Continuously
Tire shoulder shape Pattern block Pattern block Strip decorative pattern Strip decorative pattern Strip decorative pattern Strip decorative pattern
Tire shoulder pattern groove angle θ 3 (°) 90 90 90 90 90 90
Strip decorative pattern chamfered section Nothing Nothing Nothing Have Have Have
Fine groove Nothing Nothing Nothing Have Have Have
Sipes per tire angle θ 4 (°) 90 90 90 90 90 90
Resistance to uneven wear sex index 100 100 105 105 105 108
Drainage performance index 100 105 98 105 107 107
Wetland operation stabilization sex index 100 103 98 105 105 107
Snowfield operation stabilization sex index 100 103 98 105 105 105
Table 2
Example 4 Example 5 Example 6 Example 7 Example 8
Translot is communicated with major trough Have Have Have Have Have
Central authorities' lopsidedness angle θ 1 (°) 50 40 30 45 45
Tire shoulder lopsidedness angle θ 2 (°) 55 65 65 60 60
Differential seat angle θ 2-θ 1 (°) 5 25 35 15 15
Convex stria portion, the end Have Have Have Have Have
The width (%) in convex stria portion, the end 20 20 20 40 60
The degree of depth (%) in convex stria portion, the end 30 30 30 50 70
The circumferential portion of translot Continuously Continuously Continuously Continuously Continuously
Tire shoulder shape Strip decorative pattern Strip decorative pattern Strip decorative pattern Strip decorative pattern Strip decorative pattern
Tire shoulder pattern groove angle θ 3 (°) 90 90 90 90 90
Strip decorative pattern chamfered section Have Have Have Have Have
Fine groove Have Have Have Have Have
Sipes per tire angle θ 4 (°) 90 90 90 90 90
Resistance to uneven wear sex index 110 106 104 108 105
Drainage performance index 105 109 111 109 111
Wetland operation stabilization sex index 105 109 111 109 109
Snowfield operation stabilization sex index 105 105 105 107 107
By table 1,2 results can be clear and definite, and the pneumatic tire of example 1 ~ 8 is compared with conventional example 1, and snowfield control stability, wetland control stability and drainage performance are all improved, and can improve resistance to uneven wear.
On the other hand, can be clear and definite by table 1 result, the pneumatic tire of comparative example 1 is pattern block due to shoulder portion, therefore cannot improve resistance to uneven wear.The pneumatic tire of comparative example 2 is not communicated with central major trough due to translot, and therefore wetland control stability and drainage performance decrease.

Claims (9)

1. a pneumatic tire, tyre surface is provided with in tire equator along the central major trough that tire circumference extends, be positioned at these central major trough tire width direction both sides and at least 2 the outside major troughs extended along tire circumference, and extend and many translots be communicated with described central major trough and described outside major trough along tire width direction between described central major trough and described outside major trough, utilize these central major troughs, outside major trough and translot, multiple pattern block is marked off at central portion, shoulder portion simultaneously outside the tire width direction of outermost outside major trough, arrange and extend and the tire shoulder pattern groove that is communicated with of not outermost with this outside major trough along tire width direction, strip decorative pattern is formed in this shoulder portion, it is characterized in that,
Described pneumatic tire is directionality decorative pattern, the described translot being positioned at tire width direction both sides relative to described central major trough is relative to the mutual reversed dip of tire equator, described translot and described central major trough connectivity part be set to acute angle with tire circumference angulation and central lopsidedness angle θ 1, the circumferential portion simultaneously projected in tire circumference according to described translot is present in the all-round mode of tire, tire circumference is in staggered configuration the described translot being positioned at described central major trough tire width direction both sides, and on described pattern block and described strip decorative pattern, sipes per tire is set,
In the tire width direction inner side edge edge of described strip decorative pattern, continuous configuration has multiple chamfered section of chamfered edge amount this shape of cyclically-varying in tire circumference, and the degree of depth of the maximum chamfered section in described chamfered section and width are 30% to 60% of the depth capacity of described outside major trough
Described strip decorative pattern is formed along tire circumference by continuous loop bank part, described tire shoulder pattern groove is not communicated with described chamfered section and terminates in described strip decorative pattern, and the described maximum chamfered section in described chamfered section is configured in the extended line region of described tire shoulder pattern groove.
2. pneumatic tire as claimed in claim 1, it is characterized in that, the convex stria portion, the end that groove depth and groove width be less than described other positions of translot is formed at the position that is communicated with of described translot and described central major trough, the groove depth in convex stria portion, the described end is set to 40 ~ 60% of described central major trough groove depth, and the groove width in convex stria portion of the described end is set to 30 ~ 50% of the maximum groove width of described translot.
3. pneumatic tire as claimed in claim 1 or 2, is characterized in that, the more described translot of described central lopsidedness angle θ 1 and described outside major trough connectivity part with the circumferential angulation of tire and tire shoulder lopsidedness angle θ 2 relative less.
4. pneumatic tire as claimed in claim 3, is characterized in that, described tire shoulder lopsidedness angle θ 2 is 5 ~ 30 ° with the difference of described central lopsidedness angle θ 1.
5. pneumatic tire as claimed in claim 1 or 2, it is characterized in that, described central lopsidedness angle θ 1 is 40 ~ 65 °.
6. pneumatic tire as claimed in claim 1 or 2, it is characterized in that, arrange fine groove on the surface of described pattern block, the spacing of this fine groove is set to 2.5 ~ 5mm simultaneously, and the degree of depth is set to 0.1 ~ 0.8mm, and width is set to 0.1 ~ 0.8mm.
7. pneumatic tire as claimed in claim 1 or 2, it is characterized in that, the tilt angle theta 3 of described tire shoulder pattern groove and tire circumference is within the scope of 90 ± 10 °.
8. pneumatic tire as claimed in claim 1 or 2, it is characterized in that, the JIS A type hardness tester of rubber at-10 DEG C forming described fetus face is 55 ~ 70.
9. pneumatic tire as claimed in claim 1 or 2, it is characterized in that, described pneumatic tire is the light truck tire used under the above condition of air pressure 350kPa.
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