CN102616090A

CN102616090A - High-capacity inflatable tire

Info

Publication number: CN102616090A
Application number: CN2012100172846A
Authority: CN
Inventors: 田中聪
Original assignee: Sumitomo Rubber Industries Ltd
Current assignee: Sumitomo Rubber Industries Ltd
Priority date: 2011-01-28
Filing date: 2012-01-19
Publication date: 2012-08-01
Anticipated expiration: 2032-01-19
Also published as: KR101760527B1; KR20120087823A; CN102616090B; JP2012158192A; JP5200123B2

Abstract

The invention provides a high-capacity inflatable tire, which is capable of preventing rubber loss and damage and improving the nibbling performance. A tread part (2) of the high-capacity inflatable tire (1) has a main groove (3) and a land portion (4). The main groove (3) comprises a tire-shoulder main groove (3A). The land portion (4) comprises a central land portion (4A) and a tire-shoulder land portion (4B). The central land portion (4A) is spacedly provided with central pattern blocks (7). A tire-shoulder auxiliary groove (9) and a tire-shoulder transverse groove (10) are formed on the tire-shoulder land portion (4B). The tire-shoulder auxiliary groove (9) comprises an outer tire-shoulder auxiliary groove (9A) and an inner tire-shoulder auxiliary groove (9B). The tire-shoulder transverse groove (10) comprises an inner portion (10A), a central portion (10B) and an outer portion (10C). The tire-shoulder land portion (4B) is spacedly provided with an inner tire-shoulder pattern block row (11A), a central tire-shoulder pattern block row (11B) and an outer tire-shoulder pattern block row (11C). The spacing distance (P2) between the inner portion (10A), the central portion (10B) and the outer portion (10C) is smaller than the spacing distance (P1) of a central transverse groove (6).

Description

Pneumatic tire for heavy vehicle

Technical field

The present invention relates to suppress rubber damaged and can improve nibbling can Pneumatic tire for heavy vehicle.

Background technology

Generally speaking, Pneumatic tire for heavy vehicle in high, press and the condition of top load under use, so for example will use the bracing ply of the multiple-structure of metal cords to be arranged at fetus face and improve the fetus face whole rigidity.

Impact when such Pneumatic tire for heavy vehicle, the shoulder zone of fetus face can't fully absorb and collide with rut is prone to take place the so-called phenomenon of sailing partially of bearing circle heavy handled thereby exist.

Particularly in recent years in Pneumatic tire for heavy vehicle, increase the so-called wide tyre surfaceization that tyre surface ground connection width improves wear-out life and constantly develop.The tendency that this wide tyre surface existence can worsen the nibbling of Pneumatic tire for heavy vehicle.

In order to suppress such phenomenon of sailing partially; For example propose to have following Pneumatic tire for heavy vehicle: through at the distolateral rill that circumferentially extends along tire that is provided with of tyre surface ground connection; Can reduce the rigidity of the tire axial of shoulder zone thus; And can absorb the impact (for example, with reference to following patent documentation 1) when colliding with rut.

Patent documentation 1: TOHKEMY 2003-341305 communique

Yet,, also have further room for improvement though above-mentioned such Pneumatic tire for heavy vehicle has improved a part of nibbling ability.

And because the rigidity of pattern block between rill and the tyre surface ground terminal or pattern rib is too small, therefore also there is the damaged damaged such problem of rubber of rubber that is easy to produce pattern block or pattern rib in above-mentioned such fetus face that is provided with rill.

Summary of the invention

The present invention proposes in view of the actual conditions of above that kind, and its main purpose is to provide a kind of rubber that can suppress damaged etc., and can improve nibbling can Pneumatic tire for heavy vehicle.

The invention that technical scheme 1 among the present invention is put down in writing is a kind of Pneumatic tire for heavy vehicle; This Pneumatic tire for heavy vehicle is in a plurality of land portion that fetus face has many tap drains circumferentially continuously extending along tire and divided by this tap drain; This Pneumatic tire for heavy vehicle is characterised in that; Said tap drain comprises: be configured in and lean on the distolateral a pair of tire shoulder tap drain of tyre surface ground connection most; Said land portion comprises: the tire shoulder land portion in the central land portion between the said tire shoulder tap drain and the tire axial of the said tire shoulder tap drain outside; Said central land portion forms at least one center running lug row; These center running lug row are the center running lug of being divided by many that circumferentially are provided with at interval along tire central traverse furrows circumferentially to be provided with along tire at interval form, and portion forms on said tire shoulder land: many tire shoulder counter drains, and they circumferentially extend along tire with the ditch width littler than said tire shoulder tap drain continuously; Many tire shoulder counter drains, they circumferentially extend along tire with the ditch width littler than said tire shoulder tap drain continuously; Said tire shoulder counter drain comprises: lean on distolateral outside tire shoulder counter drain of tyre surface ground connection and the inboard tire shoulder counter drain between this outside tire shoulder counter drain and the said tire shoulder tap drain most; And said tire shoulder traverse furrow comprises: in the inside portion of extending between said tire shoulder tap drain and the said inboard tire shoulder counter drain, the pars intermedia that between said inboard tire shoulder counter drain and said outside tire shoulder counter drain, extends and the outside portion of between outside tire shoulder counter drain and tyre surface ground terminal, extending; Said thus tire shoulder land portion comprises: inboard pattern block on tire shoulder row, these inboard pattern block on tire shoulder row are the inboard pattern block on tire shoulder of being divided by the inside portion of said tire shoulder tap drain, said inboard tire shoulder counter drain and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form; Middle pattern block on tire shoulder row, these centre pattern block on tire shoulder row are the middle pattern block on tire shoulder of being divided by the pars intermedia of said inboard tire shoulder counter drain, said outside tire shoulder counter drain and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form; And outside pattern block on tire shoulder row; This outside pattern block on tire shoulder row are the outside pattern block on tire shoulder of being divided by the outside portion of said outside tire shoulder counter drain, said tyre surface ground terminal and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form, each tire of the inside portion of said tire shoulder traverse furrow, pars intermedia and outside portion circumferential at a distance from establish spacing less than the tire of said central traverse furrow circumferential at a distance from establishing spacing.

And the invention that technical scheme 2 is put down in writing is on the basis of the Pneumatic tire for heavy vehicle that technical scheme 1 is put down in writing, and said outside tire shoulder counter drain is bigger and littler than the trench depth of said inboard tire shoulder counter drain than the ditch width of said inboard tire shoulder counter drain.

And; The invention that technical scheme 3 is put down in writing is on the basis of the Pneumatic tire for heavy vehicle that technical scheme 1 or 2 is put down in writing, relation below the width W 3 of the width W 2 of the tire axial of the width W 1 of the tire axial of said inboard pattern block on tire shoulder, said middle pattern block on tire shoulder and the tire axial of said outside pattern block on tire shoulder satisfies:

W1＞W2＞W3。

And the invention that technical scheme 4 is put down in writing is on the basis of each Pneumatic tire for heavy vehicle of putting down in writing in technical scheme 1 to 3, and said tire shoulder traverse furrow is configured to: said inside portion and said pars intermedia are in the phase place that upwards staggers in tire week.

And; The invention that technical scheme 5 is put down in writing is on the basis of each Pneumatic tire for heavy vehicle of putting down in writing in technical scheme 1 to 4, and said tire shoulder traverse furrow is configured to: said pars intermedia and said outside portion are continuous on tire axial via said outside tire shoulder counter drain.

And the invention that technical scheme 6 is put down in writing is on the basis of the Pneumatic tire for heavy vehicle that technical scheme 5 is put down in writing, and the ditch width of the said outside portion of said tire shoulder traverse furrow is greater than the ditch width of said pars intermedia.

And the invention that technical scheme 7 is put down in writing is on the basis of each Pneumatic tire for heavy vehicle of putting down in writing in technical scheme 1 to 6, and the trench depth of said tire shoulder traverse furrow increases towards said outside portion from said pars intermedia.

And; The invention that technical scheme 8 is put down in writing is on the basis of each Pneumatic tire for heavy vehicle of putting down in writing in technical scheme 1 to 7, on the pattern block on tire shoulder of the said outside and at the corner part that the outside face of the pattern block tread of this outside pattern block on tire shoulder and sidewall portions constitutes, chamfering is set.

In addition, in this manual if no special declaration, then the size of each one of tire is made as wheel rim and is assembled in regular wheel rim and has filled definite value under the uncharge normal state of pressing in regular.

Said " regular wheel rim " is meant in the schematism of the specification that comprises tire institute foundation the wheel rim of stipulating this specification according to each tire; If for example JATMA then representes standard rim; If TRA then representes " Design Rim ", if perhaps ETRTO then representes " Measuring Rim ".

Said " pressing in regular " is meant the air pressure of stipulating said specification according to each tire; If JATMA then is " anticyclonic pressure "; If TRA is the maxim for being put down in writing in the table " TIRE LOAD LIMITS ATVARIOUS COLD INFLATION PRESSURES " then, if ETRTO then is " INFLATION PRESSURE ".

Pneumatic tire for heavy vehicle of the present invention is in a plurality of land portion that fetus face has many tap drains that circumferentially continuously extend along tire and utilizes that this tap drain divides.Tap drain comprises being configured in and leans on most the distolateral a pair of tire shoulder tap drain of tyre surface ground connection.And land portion comprises the tire shoulder land portion in the tire axial outside of central land portion and tire shoulder tap drain between the tire shoulder tap drain.

Land portion of central authorities is formed with at least one center running lug row, and these center running lug row are the center running lug of being divided by many that circumferentially are provided with at interval along tire central traverse furrows circumferentially to be provided with along tire at interval form.On the other hand, portion is formed with on tire shoulder land: many tire shoulder counter drains, and they circumferentially extend along tire with the ditch width littler than tire shoulder tap drain continuously; Many tire shoulder traverse furrows, their edges are extended with the crossing direction of above-mentioned tire shoulder counter drain and circumferentially are provided with at interval along tire.

The tire shoulder counter drain comprises: lean on the distolateral outside tire shoulder counter drain of tyre surface ground connection most; And the inboard tire shoulder counter drain between this outside tire shoulder counter drain and the said tire shoulder tap drain.And the tire shoulder traverse furrow comprises: the inside portion of between tire shoulder tap drain and inboard tire shoulder counter drain, extending; The pars intermedia that between inboard tire shoulder counter drain and outside tire shoulder counter drain, extends; And the outside portion of between outside tire shoulder counter drain and tyre surface ground terminal, extending.

Tire shoulder land portion comprises thus: inboard pattern block on tire shoulder row, these inboard pattern block on tire shoulder row are the inboard pattern block on tire shoulder of being divided by the inside portion of tire shoulder tap drain, said inboard tire shoulder counter drain and tire shoulder traverse furrow circumferentially to be provided with along tire at interval form; Middle pattern block on tire shoulder row, these centre pattern block on tire shoulder row are the middle pattern block on tire shoulder of being divided by the pars intermedia of inboard tire shoulder counter drain, said outside tire shoulder counter drain and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form; And outside pattern block on tire shoulder row, these outside pattern block on tire shoulder row are the outside pattern block on tire shoulder of being divided by the outside portion of outside tire shoulder counter drain, tyre surface ground terminal and tire shoulder traverse furrow circumferentially to be provided with along tire at interval form.

And then what each tire of the inside portion of tire shoulder traverse furrow, pars intermedia and outside portion was circumferential is set to less than the circumferential separated spacing of establishing of the tire of central traverse furrow at a distance from establishing spacing.

Like this; Because the tire shoulder land portion of Pneumatic tire for heavy vehicle of the present invention is divided into: inboard pattern block on tire shoulder row, middle pattern block on tire shoulder row and outside pattern block on tire shoulder row; And each tire axial of the inside portion of tire shoulder traverse furrow, pars intermedia and outside portion at a distance from establish spacing be set to less than the tire of central traverse furrow circumferential at a distance from establishing spacing, thereby the rigidity of tire shoulder land portion reduces.Therefore, tire shoulder land portion is can be flexibly crooked to absorb the impact of the tire axial of generation when collide with rut, thereby can improve the nibbling ability.

And the rigidity of tire shoulder land portion spreads all over integrally equably and reduces owing to being provided with many counter drains, and it is damaged therefore can to suppress such in the past rubber.

Especially; In Pneumatic tire for heavy vehicle of the present invention; Because what each tire of inside portion, pars intermedia and the outside portion of tire shoulder traverse furrow was circumferential is set to less than the circumferential separated spacing of establishing of the tire of central traverse furrow at a distance from establishing spacing; Therefore the circumferential impact of tire can also be absorbed through flexibly crooked, thereby the nibbling ability can be improved.On the other hand, because central land portion has kept its rigid circumference, the reduction of therefore can suppress to keep straight on stability and road-holding property.

Description of drawings

Fig. 1 is the tyre surface expansion drawing of the Pneumatic tire for heavy vehicle of this embodiment.

Fig. 2 is the A-A cutaway view of Fig. 1.

Fig. 3 is the local expansion drawing of amplifying the central land portion that Fig. 1 is shown.

Fig. 4 is the local expansion drawing of amplifying the tire shoulder land portion that Fig. 1 is shown.

Fig. 5 amplifies the cutaway view that the outside pattern block on tire shoulder that collides with rut is shown.

Fig. 6 is the tyre surface expansion drawing of the Pneumatic tire for heavy vehicle of comparative example.

The drawing reference numeral explanation:

1... Pneumatic tire for heavy vehicle; 2... fetus face; 3... tap drain; 4... land portion; 4A... central land portion; 4B... tire shoulder land portion; 6... central traverse furrow; 7... center running lug; 8... center running lug row; 9... tire shoulder counter drain; 10... tire shoulder traverse furrow; 11A... inboard pattern block on tire shoulder; 11B... middle pattern block on tire shoulder; 11C... outside pattern block on tire shoulder; 12A... inboard pattern block on tire shoulder row; 12B... middle pattern block on tire shoulder row; 12C... outside pattern block on tire shoulder row.

The specific embodiment

Below based on accompanying drawing an embodiment of the invention are described.

Like Fig. 1, shown in 2; The Pneumatic tire for heavy vehicle of this embodiment (following abbreviate as sometimes " tire ") 1 for example shows the studless tire that load-carrying vehicles such as lorry, motorcoach are used in a plurality of land portion 4 that fetus face 2 has many tap drains 3 that circumferentially continuously extend along tire and utilizes that this tap drain 3 divides.

Said tap drain 3 comprises and is configured in a pair of tire shoulder tap drain 3A, the 3A that leans on most tyre surface ground terminal 2e side.Thus, said land portion 4 is divided into: the tire shoulder land 4B of portion, the 4B in the central land 4A of portion between tire shoulder tap drain 3A, the 3A and the tire axial of the tire shoulder tap drain 3A outside.

Said tire shoulder tap drain 3A for example forms the straight flute that circumferentially extends continuously along tire.Because such tire shoulder tap drain 3A can be with the moisture film between the tread of road surface and fetus face 2 along circumferentially guiding swimmingly of tire; And can be with snow compacting and obtain bigger snow post shear strength effectively in ditch, therefore can improve drainage performance and snow is gone up performance.Preferably, the ditch width E1 of tire shoulder tap drain 3A be tread width TW 1/2 distance that is tyre surface one half width 0.5TW about 5%～8%, trench depth D1 is about 16%～19% of tyre surface one half width 0.5TW.

Said tread width TW is made as the tyre surface ground terminal 2e under the said normal state, the tire axial distance between the 2e here.In addition; When from can discern through clear and definite edge in appearance the time; This tyre surface ground terminal 2e is this edge; Under situation about can't discern, the roller tire in the time of will loading regular load to the tire under the normal state and make fetus face 2 ground connection be the plane with 0 ° of camber angle axially outside ground connection is that the ground terminal on plane is defined as tyre surface ground terminal 2e.

Said " regular load " is meant in the schematism of the specification that comprises tire institute foundation the load of stipulating each specification according to each tire; If JATMA then refers to maximum load capability; If TRA then refers to the maxim that table is put down in writing in " TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES ", if ETRTO then refers to " LOAD CAPACITY ".

The central land 4A of portion at this embodiment is formed with: many central counter drains 5, and they circumferentially extend along tire with the ditch width littler than tire shoulder tap drain 3A continuously; Many central traverse furrows 6, their edges are extended with said central counter drain 5 crossing directions and circumferentially are provided with at interval along tire.Thus, the central land 4A of portion forms a plurality of center running lug row 8, and these a plurality of center running lug row 8 are the center running lug of being divided by many central counter drains 5 and many central traverse furrows 67 circumferentially to be provided with along tire at interval form.

Said central counter drain 5 comprises: the inboard central counter drain 5A that on tire equator C, extends and the counter drain 5B of pair of outside central authorities, the 5B that are configured in the tire axial both sides of the counter drain 5A of these inboard central authorities.These inboards, the counter drain 5A of outside central authorities, 5B also form along the circumferential continuous straight flute of tire with tire shoulder tap drain 3A equally.

Such inboard, the counter drain 5A of outside central authorities, 5B can guarantee the rigidity of the central land 4A of portion and can improve drainage performance and avenge upward performance.Preferably, the ditch width E2 of inboard, the central counter drain 5A in the outside, 5B is about 1%～3% of tyre surface one half width 0.5TW, and trench depth D2 is about 8%～12% of tyre surface one half width 0.5TW.

Said central traverse furrow 6 comprises: inboard central traverse furrow 6A that between central counter drain 5A in inboard and the counter drain 5B of outside central authorities, extends and the traverse furrow 6B of outside central authorities that between outside counter drain 5B of central authorities and tire shoulder tap drain 3A, extends.

Because such inboard, the traverse furrow 6A of outside central authorities, 6B can guide the moisture film between central land 4A of portion and road surface along tire axial swimmingly, and can obtain to avenge the post shear strength, therefore help to improve upward performance of drainage performance and snow.Preferably, the ditch width E3 of inboard, the central traverse furrow 6A in the outside, 6B is about 4%～6% of tyre surface one half width 0.5TW, and trench depth D3 is about 10%～15% of tyre surface one half width 0.5TW.

Shown in Fig. 3 amplifies, the inboard of this embodiment, the traverse furrow 6A of outside central authorities, 6B, what for example separately tire was circumferential sets for identically in fact at a distance from establishing spacing P1, P1, and is being configured to roughly zig-zag with upwards staggering phase place tire week.Such inboard, the traverse furrow 6A of outside central authorities, 6B help to make the spacing noise in going to disperse.In addition, this substantial identical comprising based on the changes in spacing of variable spacing method etc. and manufacturing errors etc.And, be the ditch line of centers 6Ac with inboard, the central traverse furrow 6A in the outside, 6B, the value that 6Bc confirms at a distance from establishing spacing P1.

As shown in Figure 1, center running lug row 8 comprise: pair of inside center running lug row 8A, and they are the inboard center running lug 7A that is divided by the central counter drain 5A in inboard, the outside counter drain 5B of central authorities and inboard central traverse furrow 6A circumferentially to be provided with along tire at interval form; Pair of outside center running lug row 8B, they are the outside center running lug 7B that is divided by the counter drain 5B of outside central authorities, tire shoulder tap drain 3A and the traverse furrow 6B of outside central authorities circumferentially to be provided with along tire at interval form.

As shown in Figure 3, it is rectangular-shaped greater than the lengthwise of the width B 1 of tire axial that said inboard center running lug 7A and said outside center running lug 7B form circumferential lengths C1.Such inboard, outside

center running lug

7A, 7B can improve the circumferential rigidity of tire and can improve tractive property and anti-irregular wear performance.Preferably, said width B 1 is about 18%～22% of tyre surface one half width 0.5TW (shown in Figure 1), and said circumferential lengths C1 is about 26%～32% of tyre surface one half width 0.5TW.

And, on the pattern block tread of inboard, outside

center running lug

7A, 7B, be respectively arranged with two tire sipe S, S that extend along tire axial.Such tire sipe S can make its marginal element play a role and increase and ice the friction force between the road surface, thereby improves performance on ice.

And then, inboard, outside

center running lug

7A, 7B since with the phase shift of the central traverse furrow 6A in inboard, the outside, 6B tire week upwards with tire axial on adjacent inboard, outside

center running lug

7A, 7B be configured to roughly zig-zag with staggering phase place.Such inboard, outside

center running lug

7A, 7B make the marginal element of its marginal element or tire sipe S upwards balancedly disperse in tire week, thereby can increase and ice the friction force between the road surface.

Like Fig. 1, shown in 2, on the 4B of portion of said tire shoulder land, be formed with: many tire shoulder counter drains 9, they circumferentially extend along tire with the ditch width littler than tire shoulder tap drain 3A continuously; Many tire shoulder traverse furrows 10, their edges are extended with above-mentioned tire shoulder counter drain 9 crossing directions and circumferentially are provided with at interval along tire.

Said tire shoulder counter drain 9 comprises: be configured in depend on most the outside tire shoulder counter drain 9A of tyre surface ground terminal 2e side and be configured in this outside tire shoulder counter drain 9A and tire shoulder tap drain 3A between inboard tire shoulder counter drain 9B.These outsides, inboard tire

shoulder counter drain

9A, 9B also form along the circumferential continuous straight flute of tire with tire shoulder tap drain 3A equally, thereby help to guarantee the rigidity of the tire shoulder land 4B of portion and improve drainage performance and the last performance of snow.Preferably, the ditch width E4 of the outside, inboard tire

shoulder counter drain

9A, 9B is about 1%～3% of tyre surface one half width 0.5TW, and trench depth D4 is about 8%～10% of tyre surface one half width 0.5TW.

And said tire shoulder traverse furrow 10 comprises: at the inside portion 10A that extends between tire shoulder tap drain 3A and the inboard tire shoulder counter drain 9B, the pars intermedia 10B that between inboard tire shoulder counter drain 9B and outside tire shoulder counter drain 9A, extends and the outside portion 10C that between outside tire shoulder counter drain 9A and tyre surface ground terminal 2e, extends.

Because such inside portion 10A, pars intermedia 10B and outside portion 10C can will discharge along tire axial between the moisture film between road surface and the tire shoulder land 4B of portion via each

counter drain

9A, 9B; And can obtain to avenge the post shear strength, therefore help to improve upward performance of drainage performance and snow.Preferably, the ditch width E5 of inside portion 10A, pars intermedia 10B and outside portion 10C is about 3%～5% of tyre surface one half width 0.5TW, and trench depth D5 is about 10%～15% of tyre surface one half width 0.5TW.

Shown in Fig. 4 amplifies, inside portion 10A, pars intermedia 10B and outside portion 10C, what for example separately tire was circumferential sets for identical in fact at a distance from establishing spacing P2.In addition, this is substantial identical and above-mentionedly likewise comprise based on the changes in spacing of variable spacing method etc. and manufacturing errors etc. at a distance from establishing spacing P1.And, be with the definite value of each ditch line of centers 10Ac, 10Bc and the 10Cc of inside portion 10A, pars intermedia 10B and outside portion 10C at a distance from establishing spacing P2.

In addition, inside portion 10A of this embodiment and pars intermedia 10B are being configured to roughly zig-zag with upwards staggering phase place tire week.Such inside portion 10A and pars intermedia 10B also help to make the spacing noise in going to disperse with inboard, the central traverse furrow 6A in the outside, 6B equally.

On the other hand, pars intermedia 10B and outside portion 10C configuration continuously on tire axial via outside tire shoulder counter drain 9A.In this embodiment, make separately ditch line of centers 10Bc, 10Cc upwards consistent in fact in tire week.Such pars intermedia 10B and outside portion 10C help the moisture film between tire shoulder land 4B of portion and road surface is discharged to tyre surface ground terminal 2e side swimmingly.

In this case, the ditch width E5c of preferred outside portion 10C is greater than the ditch width E5b of pars intermedia 10B.Thus, the 4B of tire shoulder land portion can 10C discharges towards tyre surface ground terminal 2e side to the outside portion from pars intermedia 10B with said moisture film.

As shown in Figure 1; The tire shoulder land 4B of portion comprises: inboard pattern block on tire shoulder row 12A, this inboard pattern block on tire shoulder row 12A circumferentially are provided with the inboard pattern block on tire shoulder 11A that is divided by tire shoulder tap drain 3A, inboard tire shoulder counter drain 9B and inside portion 10A along tire to form at interval; Middle pattern block on tire shoulder row 12B, this centre pattern block on tire shoulder row 12B circumferentially are provided with the middle pattern block on tire shoulder 11B that is divided by inboard tire shoulder counter drain 9B, outside tire shoulder counter drain 9A and pars intermedia 10B along tire to form at interval; Outside pattern block on tire shoulder row 12C, this outside pattern block on tire shoulder row 12C circumferentially are provided with the outside pattern block on tire shoulder 11C that is divided by outside tire shoulder counter drain 9A, tyre surface ground terminal 2e and outside portion 10C along tire to form at interval.

Like this, the tire shoulder land 4B of portion is divided into three parts by inboard pattern block on tire shoulder row 12A, middle pattern block on tire shoulder row 12B and outside pattern block on tire shoulder row 12C on Width, thereby its rigidity is reduced on tire axial equably.Such tire shoulder land 4B of portion is because inboard pattern block on tire shoulder 11A, middle pattern block on tire shoulder 11B and outside pattern block on tire shoulder 11C flexibly crooked and impact tire axial of generation can absorb this tire shoulder land 4B of portion with the rut collision time on tire axial; Even for example increase the tire that tread width TW improves the so-called wide tyre surfaceization of wear-out life, also can improve the nibbling ability.

And the rigidity of the tire shoulder land 4B of portion reduces on tire axial because of being provided with

many counter drain

9A, 9B equably, and it is damaged often therefore can to suppress the rubber that rigidity because of the tire shoulder land 4B of portion reduces to produce partly as in the past effectively.

And then in this embodiment, like Fig. 3 and shown in Figure 4, inside portion 10A, pars intermedia 10B and outside portion 10C are set to the separated spacing P1 that establishes less than each

central traverse furrow

6A, 6B at a distance from establishing spacing P2.Thus; Because the tire shoulder land 4B of portion can make inboard, outside center running lug 7A, the 7B of the rigid circumference of inboard, centre and outside pattern block on

tire shoulder

11A, 11B and 11C less than the central land 4A of portion; The impact of the tire axial that produces in the time of therefore not only can absorbing with the rut collision because of bending flexibly; The circumferential impact of tire can also be absorbed, thereby the nibbling ability can be further improved.

On the other hand, because the central land 4A of portion has kept the rigid circumference of inboard, outside

center running lug

7A, 7B, so it is damaged to suppress the rubber of reduction or the central land 4A of portion of road-holding property.

In addition, if increasing at a distance from establishing spacing P2 of tire shoulder traverse furrow 10 then might fully improve above-mentioned such nibbling ability.On the contrary, if at a distance to establish spacing P2 too small, then the rigidity of the 4B of tire shoulder land portion is too small, thereby might cause the reduction of road-holding property or rubber damaged.According to such viewpoint, at a distance from establish spacing P2 be preferably each central traverse furrow 6 at a distance from establishing below 80% of spacing P1, more preferably below 70%, and be preferably at a distance from establishing more than 50% of spacing P1, more preferably more than 60% at a distance from establishing spacing P2.

And then the number circumferential as if the tire of each inside portion 10A, pars intermedia 10B and outside portion 10C is few, then might fully improve above-mentioned such nibbling ability.On the contrary, even said number is many, also might cause the decline of road-holding property or rubber damaged.According to such viewpoint, number is preferably more than 60, and more preferably more than 100, and number is preferably below 150, more preferably below 130.

And as shown in Figure 2, the trench depth D5 of tire shoulder traverse furrow 10 preferably increases (D5b＜D5c) from the outside sidepiece 10C of pars intermedia 10B.Thus, because the tire shoulder land 4B of portion reduces the rigidity that is easy to receive from rut the tyre surface ground terminal 2e side of huge impact effectively, therefore can improve the nibbling ability.

And then as shown in Figure 4, the ditch width E4a of said outside tire shoulder counter drain 9A is preferably more than the ditch width E4b of said inboard tire shoulder counter drain 9B.Thus,, and can make the outside pattern block on tire shoulder 11C that is easy to receive huge impact crooked effectively, therefore can further improve the nibbling ability to the tire axial inboard from rut because the tire shoulder land 4B of portion can not make its rigidity excessively reduce.

In addition, if the ditch width E4a of outside tire shoulder counter drain 9A reduces, then might bring into play the effect of above-mentioned that kind effectively.On the contrary,, the rigidity of the tire shoulder land 4B of portion is excessively reduced, thereby cause the reduction of road-holding property and rubber damaged if ditch width E4a excessively increases.According to such viewpoint, said ditch width E4a is preferably more than 110% of ditch width E4b of inboard tire shoulder counter drain 9B, and more preferably more than 150%, and said ditch width E4a is preferably below 150% of ditch width E4b, more preferably below 220%.

On the other hand, as shown in Figure 2, the trench depth D4a of outside tire shoulder counter drain 9A is preferably set to the trench depth D4b less than inboard tire shoulder counter drain 9B.Thus, the tire shoulder land 4B of portion can suppress its rigidity by the outside tire shoulder counter drain 9A that forms wide cut excessively to be reduced, thereby can keep road-holding property and suppress rubber damaged.

In addition, if the trench depth D4a of outside tire shoulder counter drain 9A increases, then might bring into play the effect of above-mentioned that kind effectively.On the contrary, if said trench depth D4a excessively reduces, then might can't make outside pattern block on tire shoulder 11C crooked fully, thereby can't improve the nibbling ability.According to such viewpoint, said trench depth D4a is preferably below 99% of trench depth D4b of inboard tire shoulder counter drain 9B, and preferred said trench depth D4a is more than 80% of trench depth D4b, more preferably more than 90%.

As shown in Figure 4, the width W 1 that said inboard pattern block on tire shoulder 11A forms tire axial is rectangular-shaped greater than growing crosswise of circumferential lengths L1.Inboard pattern block on tire shoulder 11A like this can improve the rigidity of tire axial, and can improve the operation stabilization performance and improve polishing machine significantly.The width W 1 of inboard pattern block on tire shoulder 11A is preferably about 20%～30% of tyre surface one half width 0.5TW (shown in Figure 1), and circumferential lengths L1 is preferably about 15%～20% of tyre surface one half width 0.5TW.

Pattern block 11B forms circumferential lengths L2 to be slightly larger than the lengthwise of width W 2 of tire axial rectangular-shaped in the middle of said.Middle pattern block on tire shoulder 11B like this can increase the marginal element of circumferentially extending along tire, thereby helps to improve performance and anti-irregular wear performance on the ice and snow.And then, because middle pattern block on tire shoulder 11B can make the rigidity of tire axial reduce, the also bending flexibly of impact of the tire axial that therefore produces when collide with rut, thus can improve the nibbling ability effectively.The width W 2 of middle pattern block on tire shoulder 11B is preferably about 10%～20% of tyre surface one half width 0.5TW (shown in Figure 1), and circumferential lengths L2 is preferably about 10%～20% of tyre surface one half width 0.5TW.

It is rectangular-shaped greater than the lengthwise of the width W 3 of tire axial that said outside pattern block on tire shoulder 11C forms circumferential lengths L3, thereby help to improve performance and anti-irregular wear performance on the ice and snow.And then, because outside pattern block on tire shoulder 11C can make the rigidity of tire axial reduce, therefore can improve the nibbling ability effectively.The width W 3 of outside pattern block on tire shoulder 11C is preferably about 3%～6% of tyre surface one half width 0.5TW (shown in Figure 1), and circumferential lengths L3 is preferably about 10%～20% of tyre surface one half width 0.5TW.

And, the width W 3 preferred satisfied following relations of the width W 1 of inboard pattern block on tire shoulder 11A, the width W 2 of middle pattern block on tire shoulder 11B and outside pattern block on tire shoulder 11C:

W1＞W2＞W3。

Because such tire shoulder land 4B of portion makes the rigidity of the tire axial of each pattern block on

tire shoulder

11A, 11B and 11C reduce gradually towards the tire axial outside that is prone to receive from rut huge impact; Therefore the rigidity of this tire shoulder land 4B of portion is excessively reduced, thereby can improve the nibbling ability.

And then, relation below the circumferential lengths L3 of the circumferential lengths L2 of the circumferential lengths L1 of inboard pattern block on tire shoulder 11A, middle pattern block on tire shoulder 11B and outside pattern block on tire shoulder 11C preferably satisfies:

L1＞L2＞L3。

Because such tire shoulder land 4B of portion makes the rigid circumference of each pattern block on

tire shoulder

11A, 11B and 11C reduce gradually towards the tire axial outside, therefore the rigidity of this tire shoulder land 4B of portion is excessively reduced, thereby can improve the nibbling ability.

And, the tire sipe S that extends along tire axial is set respectively on the pattern block tread of inboard, middle pattern block on

tire shoulder

11A, 11B, thereby can improves performance on ice.In this embodiment, two tire sipe S are set on inboard pattern block on tire shoulder 11A, and a tire sipe S is set on middle pattern block on tire shoulder 11B, and on the pattern block on tire shoulder 11C of the outside, tire sipe S is not set.Thus, therefore the excessive reduction owing to centre, outside pattern block on

tire shoulder

11B, 11C have suppressed the pattern block rigidity can keep the nibbling ability and suppress rubber damaged.

And then inboard, middle pattern block on

tire shoulder

11A, 11B are owing to the staggering of phase place of inside portion 10A, pars intermedia 10B makes phase place be configured to roughly zig-zag with upwards staggering in tire week.Such inboard, middle pattern block on

tire shoulder

11A, 11B help balancedly to bring into play the effect of the marginal element of its marginal element or tire sipe S.

On the other hand, centre, outside pattern block on

tire shoulder

11B, 11C through with pars intermedia 10B and outside portion 10C along tire axial configuration and along tire axial and row arrangement continuously.Because such centre, outside pattern block on

tire shoulder

11B, 11C can make their marginal element roughly continuous along tire axial, therefore can improve performance on ice.

As shown in Figure 2, preferably on the pattern block on tire shoulder 11C of the outside and at the corner part 15 that the outside face of its pattern block tread 13 and sidewall portions 14 constitutes, chamfering 16 is set.The rubber that such chamfering 16 can suppress corner part 15 effectively is damaged; And it is as shown in Figure 5; Owing to receive the tire power F1 radially that acts on outside pattern block on tire shoulder 11C by rut 17; And make this outside pattern block on tire shoulder 11C avoid F1 to the inboard distortion of tire axial, therefore can improve the nibbling ability effectively.

In addition, if chamfering 16 is less with respect to tire angle [alpha] 1 radially,, therefore receives said power F1 and outside pattern block on tire shoulder 11C is out of shape to tire axial is inboard then because radially near tire.On the contrary, even said angle [alpha] 1 is bigger,, therefore might make outside pattern block on tire shoulder 11C can't avoid power F1 fully to the inboard distortion of tire axial owing to receive power F1 with subvertical angle.According to such viewpoint, said angle [alpha] 1 is preferably more than 27 °, and more preferably more than 32 °, and said angle [alpha] 1 is preferably below 45 °, more preferably below 40 °.

Though more than the present invention especially preferred embodiment is described in detail, the present invention is not limited to graphic embodiment, implements but can be deformed into variety of way.

Embodiment

Made the tire that forms basic structure shown in Figure 1 and have the tire shoulder land portion shown in the table 1, and their performance has been estimated.And,, the tire (comparative example 4) with tire shoulder land portion shown in Figure 6 has also been carried out same evaluation as relatively.Wherein, common specification is as follows.

Tire size: 11R22.5

Rim size: 22.5 * 7.50

Tyre surface one half width 0.5TW:121mm

The tire shoulder tap drain:

Ditch width E1:7.9mm

Trench depth D1:20.6mm

Than (E1/0.5TW): 6.53%

Than (D1/0.5TW): 17.02%

Inboard, the central counter drain in the outside:

Ditch width E2:2.0mm

Trench depth D2:12.0mm

Than (E2/0.5TW): 1.7%

Than (D2/0.5TW): 9.9%

Inboard, the central traverse furrow in the outside:

Ditch width E3:6.2mm

Trench depth D3:14.5mm

Than (E3/0.5TW): 5.12%

Than (D3/0.5TW): 12.0%

Inboard, outside center running lug:

Width B 1:25.2mm

Circumferential lengths C1:35.3mm

Than (B1/0.5TW): 20.83%

Than (C1/0.5TW): 29.17%

The inside portion

Ditch width E5a:4.6mm

Trench depth D5a:15.0mm

Than (E5a/0.5TW): 3.8%

Than (D5a/0.5TW): 12.4%

The number that tire is circumferential: 120

Test method is as follows.

< nibbling ability, road-holding property >

Each testing tire wheel rim is assembled in the whole wheels that are installed on the 2-D car of 8.5 tons of load carrying abilities in above-mentioned wheel rim and the filling behind the pressure 800kPa; And then under complete vehicle curb condition, on the anti-treadway payment of sailing test usefulness partially, go, vehicle is kept straight on, got into movements (nibbling ability) such as rut, disengaging rut and road-holding property according to the sensory evaluation of chaufeur and estimate in rut.Comparative example 1 is made as 100 scoring and comes evaluation result, numerical value is the bigger the better.

< number that rubber is damaged >

Under these conditions each testing tire is carried out whole wheels that above-mentioned vehicle was assembled and be installed on to wheel rim; And then make vehicle ' till the tire sipe that is arranged at each pattern block disappears, and then through the visual damaged number of rubber of confirming central land portion and tire shoulder land portion.

Test result is shown in table 1.

Table 1

The results verification of test the tire of embodiment can to suppress rubber damaged and can improve the nibbling ability.

Claims

1. Pneumatic tire for heavy vehicle, this Pneumatic tire for heavy vehicle be in a plurality of land portion that fetus face has many tap drains circumferentially extending continuously along tire and divided by this tap drain, and this Pneumatic tire for heavy vehicle is characterised in that,

Said tap drain comprises: is configured in and leans on the distolateral a pair of tire shoulder tap drain of tyre surface ground connection most,

Said land portion comprises: the tire shoulder land portion in the central land portion between the said tire shoulder tap drain and the tire axial of the said tire shoulder tap drain outside,

Said central land portion forms at least one center running lug row, and these center running lug row are the center running lug of being divided by many that circumferentially are provided with at interval along tire central traverse furrows circumferentially to be provided with along tire at interval form,

Portion forms on said tire shoulder land: many tire shoulder counter drains, and they circumferentially extend along tire with the ditch width littler than said tire shoulder tap drain continuously; Many tire shoulder traverse furrows, their edges are extended with the crossing direction of said tire shoulder counter drain and circumferentially are provided with at interval along tire,

Said tire shoulder counter drain comprises: lean on distolateral outside tire shoulder counter drain of tyre surface ground connection and the inboard tire shoulder counter drain between this outside tire shoulder counter drain and the said tire shoulder tap drain most, and

Said tire shoulder traverse furrow comprises: in the inside portion of extending between said tire shoulder tap drain and the said inboard tire shoulder counter drain, the pars intermedia that between said inboard tire shoulder counter drain and said outside tire shoulder counter drain, extends and the outside portion of between outside tire shoulder counter drain and tyre surface ground terminal, extending, thus

Said tire shoulder land portion comprises:

Inboard pattern block on tire shoulder row, these inboard pattern block on tire shoulder row are the inboard pattern block on tire shoulder of being divided by the inside portion of said tire shoulder tap drain, said inboard tire shoulder counter drain and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form;

Middle pattern block on tire shoulder row, these centre pattern block on tire shoulder row are the middle pattern block on tire shoulder of being divided by the pars intermedia of said inboard tire shoulder counter drain, said outside tire shoulder counter drain and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form; And

Outside pattern block on tire shoulder row, these outside pattern block on tire shoulder row are the outside pattern block on tire shoulder of being divided by the outside portion of said outside tire shoulder counter drain, said tyre surface ground terminal and said tire shoulder traverse furrow circumferentially to be provided with along tire at interval form,

Each tire of the inside portion of said tire shoulder traverse furrow, pars intermedia and outside portion circumferential at a distance from establish spacing less than the tire of said central traverse furrow circumferential at a distance from establishing spacing.

2. Pneumatic tire for heavy vehicle according to claim 1 is characterized in that,

Said outside tire shoulder counter drain is bigger and littler than the trench depth of said inboard tire shoulder counter drain than the ditch width of said inboard tire shoulder counter drain.

3. Pneumatic tire for heavy vehicle according to claim 1 and 2 is characterized in that,

Relation below the width W 3 of the width W 2 of the tire axial of the width W 1 of the tire axial of said inboard pattern block on tire shoulder, said middle pattern block on tire shoulder and the tire axial of said outside pattern block on tire shoulder satisfies:

W1＞W2＞W3。

4. according to each described Pneumatic tire for heavy vehicle in the claim 1 to 3, it is characterized in that,

Said tire shoulder traverse furrow is configured to: said inside portion and said pars intermedia are in the phase place that upwards staggers in tire week.

5. according to each described Pneumatic tire for heavy vehicle in the claim 1 to 4, it is characterized in that,

Said tire shoulder traverse furrow is configured to: said pars intermedia and said outside portion are continuous on tire axial via said outside tire shoulder counter drain.

6. Pneumatic tire for heavy vehicle according to claim 5 is characterized in that,

The ditch width of the said outside portion of said tire shoulder traverse furrow is greater than the ditch width of said pars intermedia.

7. according to each described Pneumatic tire for heavy vehicle in the claim 1 to 6, it is characterized in that,

The trench depth of said tire shoulder traverse furrow increases towards said outside portion from said pars intermedia.

8. according to each described Pneumatic tire for heavy vehicle in the claim 1 to 7, it is characterized in that,

On the pattern block on tire shoulder of the said outside and at the corner part that the outside face of the pattern block tread of this outside pattern block on tire shoulder and sidewall portions constitutes, chamfering is set.