JP2003191715A - Pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a pneumatic tire which improves wet drainage properties, restrain uneven abrasion, and also to improve even abrasion properties and dry-wet operation stability. <P>SOLUTION: The end of an inner land part 16 on an end of the tire axial direction is formed with inclination, and drainage is improved by restraining turbulence in a groove for efficient drainage, and the volume of the inner land part 16 is made larger so as to improve rigidity of the inner land part 16. As a result, operation stability both on a dry road surface and a wet road surface is improved, and even abrasion properties is also improved by reducing uneven abrasion. The end of the outer land part 20 on an end of the tire axial direction is formed with inclination so that it overlaps the inner land part 16, rigidity of the outer land part 20 is raised, and dry operation stability and even abrasion properties is improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire which prevents deterioration of wet drainage and suppresses uneven wear to improve uneven wear and dry steering stability.

[0002]

2. Description of the Related Art Conventionally, in order to improve steering stability on a dry road surface (dry steering stability), the depth of the groove portion of the land portion and the groove portion constituting the tread pattern of a pneumatic tire is reduced to reduce the block. Means have been taken to increase rigidity.

However, the above-mentioned means causes the water flow in the groove to be disturbed, so that there is a problem that the wet drainage property is deteriorated.

Here, in order to improve wet drainage, means such as increasing the groove depth and forming a high angle groove in which the inclination angle of the inclined groove with respect to the tire circumferential direction is formed (for example, However, in all of them, there is a problem that the block rigidity is lowered and the dry steering stability and the uneven wear property are deteriorated.

[0005]

[Patent Document 1] JP-A-62-214004 (first
(See page 1, Figure 1)

[0006]

Therefore, in consideration of the above facts, the present invention can prevent the deterioration of wet drainage and suppress uneven wear to improve uneven wear and dry steering stability. An object is to provide a pneumatic tire that can be used.

[0007]

According to a first aspect of the present invention, there is provided a pneumatic tire having at least two land portions adjacent to each other on a tread, and one of the end portions of one land portion is adjacent to the other. At the end on the land side, an inclined surface that is inclined toward the other land is formed, and at the end on the side of the one land of the ends of the other land, An inclined surface that inclines toward the land portion is formed, and the end portion of the other land portion side of the one land portion is connected to the inclined surface of the other land portion. .

Next, the function and effect of the pneumatic tire according to claim 1 will be described.

A plurality of land portions are formed on the tread, and in two land portions adjacent to each other, one end portion of one land portion is adjacent to the other end portion of the other land portion, and the other is adjacent to the other land portion. An inclined surface that is inclined toward the land portion is formed, and an inclined surface that is inclined toward one land portion is formed at one of the end portions on the land portion side of the other land portion. The other land-side end of the land is connected to the slope of the other land.

Therefore, a groove having a substantially V-shaped cross section is formed by the inclined surface of one land portion and the inclined surface of the other land portion.

As a result, water can smoothly flow into the groove from the surface of the land portion, and the deterioration of wet drainage can be prevented.

Further, of the end portions of one land portion, the vicinity of the end portion on the other land portion side is inclined, so that one end portion is formed in the tire radial direction as compared with the case where the end portion is formed in the tire radial direction. The rigidity of the land portion can be improved. As a result, dry steering stability can be improved, uneven wear can be reduced, and uneven wear can be improved.

Further, of the end portions of the other land portion, since the vicinity of the end portion on the one land portion side is inclined, similarly, the rigidity of the other land portion can be improved. As a result,
While improving the dry steering stability,
Uneven wear can be reduced and uneven wear can be improved.

As described above, according to the pneumatic tire of the present invention, it is possible to prevent deterioration of wet drainage property, suppress uneven wear, and improve uneven wear resistance and dry steering stability.

According to a second aspect of the present invention, in the pneumatic tire according to the first aspect, at least two land portions adjacent to each other in the tire axial direction are provided on the tread, and the inner land located on the tire axial center side. Near the end of the outer side in the tire axial direction, an inner land portion inclined surface that is inclined toward the outer land portion located on the outer side in the tire axial direction is formed, and the end portion of the outer land portion on the center side in the tire axial direction is formed. An outer land portion inclined surface that is inclined toward the inner land portion is formed in the vicinity, and an end portion on the inner land portion side of the outer land portion is connected to the inner land portion slope. I am trying.

Next, the function and effect of the pneumatic tire of claim 2 will be described.

The pneumatic tire of the present invention has at least two land portions adjacent to each other in the tire axial direction on the tread.

Here, in the vicinity of the end portion on the outer side in the tire axial direction of the inner land portion located on the tire axial center side, an inner land portion inclined surface inclined toward the outer land portion located on the tire axial direction outer side is provided. An outer land slope is formed near the end of the outer land on the tire axial center side, and an outer land slope that slopes toward the inner land is formed. It is connected to the slope of the department.

Therefore, a circumferential groove having a substantially V-shaped cross section is formed by the outer land inclined surface of the outer land portion and the inner land inclined surface of the inner land portion.

As a result, the water smoothly flows into the circumferential groove from the surface of the inner land portion, and further flows from the circumferential groove into the inclined groove, whereby the wet drainage property can be prevented from lowering.

Further, since the vicinity of the end portion on the tire axial direction end portion of the inner land portion is inclined outward in the tire axial direction, as compared with the case where the end portion is formed in the tire radial direction. The rigidity of the inner land portion can be improved. As a result, dry steering stability can be improved, uneven wear can be reduced, and uneven wear can be improved.

On the other hand, since the vicinity of the end of the outer land portion on the tire axial direction center side is inclined toward the tire axial direction center side, the rigidity of the outer land portion can be similarly improved. As a result, similarly, dry steering stability can be improved, uneven wear can be reduced, and uneven wear can be improved.

As described above, according to the pneumatic tire of the present invention, it is possible to prevent deterioration of wet drainage property, suppress uneven wear and improve uneven wear resistance and dry steering stability.

According to a third aspect of the present invention, in the pneumatic tire according to the second aspect, the inclination angle of the inner land portion inclined surface with respect to the tire normal direction is with respect to the outer land portion inclined surface with respect to the tire normal direction. It is characterized by being larger than the inclination angle.

Next, the function and effect of the pneumatic tire of claim 3 will be described.

When the inclination angle of the inner land sloped surface with respect to the tire normal direction is smaller than the inclination angle of the outer land sloped surface with respect to the tire normal direction, the surface of the inner land portion is changed to the circumferential groove on the outer side in the tire axial direction. Disturbance occurs in the flowing water flow, and the drainage performance deteriorates, which is inappropriate.

According to a fourth aspect of the present invention, in the pneumatic tire according to the third aspect, the inclination angle of the inclined surface of the inner land portion with respect to the tire normal direction is 30 degrees or more and 70 degrees or less, The inclination angle of the inclined surface with respect to the tire normal direction is 5 degrees or more and 50 degrees or less.

Next, the function and effect of the pneumatic tire according to claim 4 will be described.

If the angle of inclination of the inner land inclined surface with respect to the tire normal direction is less than 30 degrees, the drainage property is lowered and it is inappropriate. On the other hand, if it exceeds 70 degrees, the volume of the groove is significantly reduced, and the drainage property is reduced, which is inappropriate.

On the other hand, if the angle of inclination of the inclined surface of the outer land portion with respect to the tire normal direction is less than 5 degrees, the rigidity of the outer land portion is not effectively improved, which is inappropriate. On the other hand, if it exceeds 50 degrees, the drainage property is deteriorated and it becomes inappropriate.

The invention according to claim 5 is the pneumatic tire according to any one of claims 2 to 4, wherein:
The depth of the circumferential groove formed of the inner land portion inclined surface and the outer land portion inclined surface and extending in the tire circumferential direction is 10% or more of the depth of the groove that divides the inner land portion and the outer land portion. 80
It is characterized by being set within%.

Next, the function and effect of the pneumatic tire according to claim 5 will be described.

If the depth of the circumferential groove is less than 10% of the depth of the groove that divides the inner land portion and the outer land portion, the drainage property is lowered, which is inappropriate.

On the other hand, if it is more than 80%, the rigidity of the inner land portion and the outer land portion is lowered and it becomes inappropriate.

The invention according to claim 6 is the pneumatic tire according to any one of claims 2 to 5, wherein the ridgeline of the inner land portion is inclined with respect to the tire circumferential direction. , Is characterized.

Next, the function and effect of the pneumatic tire according to claim 6 will be described.

Since the ridgeline of the inner land portion is inclined with respect to the tire circumferential direction, the inner land portion inclined surface becomes closer to the water flow direction when the tire is in contact with the road surface, and drainage is improved.

The ridgeline of the inner land portion refers to a line that forms a boundary between the tread surface of the inner land portion and the inclined surface of the inner land portion.

According to a seventh aspect of the present invention, in the pneumatic tire according to the sixth aspect, the ridgeline of the inner land portion has an inclination angle with respect to the tire circumferential direction of not less than -10 degrees and not more than +45 degrees. It has a feature.

Next, the function and effect of the pneumatic tire according to claim 7 will be described.

When the inclination angle of the ridgeline of the inner land portion with respect to the tire circumferential direction is smaller than -10 degrees, the drainage performance is undesirably lowered because it is largely different from the water flow direction when the tire touches the road surface.

On the other hand, when the inclination angle of the ridgeline of the inner land portion with respect to the tire circumferential direction is larger than 45 degrees, the block rigidity of the inner land portion is lowered, which is inappropriate.

As a sign of the inclination angle,-(minus) means a state in which the end of the ridge line located in the tire rotation direction at the time of forward movement is directed toward the end side in the tire axial direction, and + (plus). Means a state in which the edge portion of the ridgeline located in the tire rotation direction faces the tire axial center side when moving forward.

The invention according to claim 8 is the pneumatic tire according to any one of claims 2 to 7, wherein:
The end portions on the tire axial direction center side of the plurality of outer land portions are connected to one inner land portion inclined surface.

Next, the function and effect of the pneumatic tire of claim 8 will be described.

Since the end portions on the tire axial direction center side of the plurality of outer land portions are connected to one inner land portion inclined surface, a plurality of outer land portions and inner land portions are formed along the tire circumferential direction. The difference in rigidity between the two can be reduced.

As a result, uneven wear can be suppressed and uneven wear can be improved, and dry steering stability can be improved.

The invention according to claim 9 is the pneumatic tire according to any one of claims 2 to 8.
The inner land portion is formed continuously in the tire circumferential direction 1
It is a rib-shaped block of a book.

Next, the function and effect of the pneumatic tire according to claim 9 will be described.

Since the inner land portion is a single rib-shaped block formed continuously in the tire circumferential direction, it is possible to minimize variations in the rigidity of the outer land portion and the inner land portion.

As a result, uneven wear can be suppressed more effectively, uneven wear resistance can be improved, and dry steering stability can also be improved.

Particularly, by connecting the ends of the plurality of outer land portions on the tire axial direction center side on the inner land portion inclined surface of the inner land portion which is a rib-like block, the traction performance in dry steering stability is improved. Can be improved.

As a result, uneven wear can be suppressed more efficiently and uneven wear property can be improved, and the vicinity of the end portion on the tire axial direction end portion of the inner land portion, which is a rib-shaped block, is inclined. By doing so, drainage is improved, and wet steering stability and wet high-prevention property can be improved.

According to a tenth aspect of the present invention, in the pneumatic tire according to the first aspect, the front land which has at least two land portions adjacent to each other in the tire circumferential direction on the tread and is located on the front side in the tire rotation direction. In the vicinity of the end on the rear side in the tire rotation direction of the end of the part, a front land slope surface that is inclined rearward in the tire rotation direction is formed, and the end of the rear land part located on the rear side in the tire rotation direction is formed. A rear land portion inclined surface that is inclined toward the front in the tire rotation direction is formed near the front end in the tire rotation direction, and the end portion on the front side in the tire rotation direction of the rear land portion is the front land portion. It is characterized in that it is connected on an inclined surface.

Next, the function and effect of the pneumatic tire according to claim 10 will be described.

In the pneumatic tire of the present invention, among the end portions of the front land portion located on the front side in the tire rotation direction, near the end portion on the rear side in the tire rotation direction, there is a front portion inclined rearward in the tire rotation direction. A land inclined surface is formed, and a rear land inclined surface that inclines forward in the tire rotation direction is formed near the front end in the tire rotation direction out of the ends of the rear land located on the rear side in the tire rotation direction. The front end of the rear land portion in the tire rotation direction is connected to the front land portion inclined surface.

Therefore, the rear land portion inclined surface and the front land portion inclined surface form an axial groove extending in the axial direction and having a substantially V-shaped cross section.

As a result, the water from the surface of the front land portion smoothly flows into the axial groove, so that the wet drainage property can be prevented from being lowered.

At the same time, since the vicinity of the rear end of the front land portion in the tire rotation direction is inclined, the rigidity of the front land portion can be improved as compared with the case where it is not inclined.

On the other hand, since the vicinity of the end on the front side in the tire rotation direction of the rear land portion is inclined toward the front side in the tire rotation direction, the rigidity of the rear land portion can be similarly improved.

As a result, it is possible to similarly improve the dry steering stability, reduce uneven wear, and improve uneven wear.

As described above, according to the pneumatic tire of the present invention, it is possible to prevent deterioration of wet drainage property, suppress uneven wear and improve uneven wear resistance and dry steering stability.

According to an eleventh aspect of the present invention, in the pneumatic tire according to the tenth aspect, the inclination angle of the front land portion inclined surface with respect to the tire normal direction is relative to the rear land portion inclined surface with respect to the tire normal direction. It is characterized by being larger than the inclination angle.

Next, the function and effect of the pneumatic tire according to claim 11 will be described.

When the inclination angle of the front land portion inclined surface with respect to the tire normal direction is smaller than the inclination angle of the rear land portion inclined surface with respect to the tire normal direction, a circumferential groove rearward in the tire circumferential direction from the surface of the front land portion is formed. Disturbance occurs in the flowing water flow, and the drainage performance deteriorates, which is inappropriate.

According to a twelfth aspect of the present invention, in the pneumatic tire according to the eleventh aspect, the inclination angle of the inclined surface of the front land portion with respect to the tire normal direction is 30 degrees or more and 70 degrees or less, The inclination angle of the inclined surface with respect to the tire normal direction is 5 degrees or more and 50 degrees or less.

Next, the function and effect of the pneumatic tire according to claim 12 will be described.

If the inclination angle of the inclined surface of the front land portion with respect to the tire normal direction is less than 30 degrees, the drainage property is lowered and it is inappropriate. On the other hand, if it exceeds 70 degrees, the volume of the groove is significantly reduced, and the drainage property is reduced, which is inappropriate.

On the other hand, if the inclination angle of the inclined surface of the rear land portion with respect to the tire normal direction is less than 5 degrees, the rigidity of the rear land portion is not effectively improved, which is inappropriate. On the other hand, if it exceeds 50 degrees, the drainage property is deteriorated and it becomes inappropriate.

A thirteenth aspect of the present invention is the pneumatic tire according to any one of the tenth to twelfth aspects, wherein the tire is composed of the front land portion inclined surface and the rear land portion inclined surface. The depth of the axial groove extending in the axial direction is set to be 10% or more and 80% or less of the depth of the groove that divides the front land portion and the rear land portion.

Next, the function and effect of the pneumatic tire according to claim 13 will be described.

If the depth of the axial groove is less than 10% of the depth of the groove that divides the front land portion and the rear land portion, the drainage property is lowered, which is inappropriate.

On the other hand, if it is more than 80%, the rigidity of the front land portion and the rear land portion is lowered and it becomes inappropriate.

A fourteenth aspect of the present invention is the pneumatic tire according to any one of the tenth to thirteenth aspects, wherein the ridgeline of the front land portion is inclined with respect to the tire axial direction. , Is characterized.

Next, the function and effect of the pneumatic tire according to claim 14 will be described.

Since the ridgeline of the front land portion is inclined with respect to the tire axial direction, the front land portion inclined surface becomes closer to the water flow direction when the tire touches the road surface, and the drainage performance is improved.

The ridgeline of the front land portion means a line that forms a boundary between the tread surface of the front land portion and the front land portion inclined surface.

According to a fifteenth aspect of the present invention, in the pneumatic tire according to the fourteenth aspect, the ridgeline of the front land portion has an inclination angle of −45 ° or more with respect to the tire axial direction +4.
It is characterized by being within 5 degrees.

Next, the function and effect of the pneumatic tire according to claim 15 will be described.

When the inclination angle of the ridgeline of the front land portion with respect to the tire axial direction is smaller than -45 degrees, the block rigidity of the front land portion is lowered, which is inappropriate.

On the other hand, when the inclination angle of the ridgeline of the front land portion with respect to the tire axial direction is larger than +45 degrees, it is inappropriate because the drainage is deteriorated because the water flow direction is largely different from that when the tire touches the road surface. .

As a sign of the inclination angle,-(minus) means a state in which the end of the ridge line on the outer side in the tire axial direction is directed to the front side in the tire rotation direction during forward movement, and +
(Plus) means a state in which the end portion of the ridge line on the outer side in the tire axial direction faces the rear side in the tire rotation direction during forward movement.

According to a sixteenth aspect of the present invention, in the pneumatic tire according to any one of the tenth to fifteenth aspects, a plurality of the rear land portions are provided on one front land portion inclined surface. It is characterized in that the ends on the tire axial direction center side are connected.

Next, the function and effect of the pneumatic tire according to claim 16 will be described.

Since the end portions of the plurality of rear land portions on the tire axial direction center side are connected to one front land portion inclined surface, a plurality of rear land portions and front land portions are formed along the tire axial direction. The difference in rigidity between the parts can be reduced.

According to a seventeenth aspect of the present invention, in the pneumatic tire according to any one of the tenth to sixteenth aspects, the front land portion is continuous in the tire circumferential direction and the width is increased or decreased. It is characterized in that it is one rib-shaped block formed repeatedly.

Next, the function and effect of the pneumatic tire according to claim 17 will be described.

Since the front land portion is a single rib-shaped block formed continuously in the tire circumferential direction, it is possible to minimize variations in the rigidity of the rear land portion and the front land portion.

As a result, uneven wear can be suppressed more effectively and uneven wear can be improved, and the vicinity of the end of the front land portion, which is a rib-shaped block, on the rear side in the tire rotation direction is inclined. As a result, the drainage property is improved, and the wet steering stability and the wet high-prevention property can be improved.

[0090]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A pneumatic tire according to a first embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the pneumatic tire 10 has a center rib 12 formed continuously in the tire circumferential direction in the vicinity of the tire equator line CL. Main grooves 14 continuous in the tire circumferential direction are formed outside the center ribs 12 in the tire axial direction.

An inner land portion 16 whose axis is inclined with respect to the tire circumferential direction is formed on the outer side of each main groove 14 in the tire axial direction. A plurality of the inner land portions 16 are formed along the tire circumferential direction.

A first inclined groove 18 extending from the tire center side toward the tire axial end side at a predetermined inclination angle is formed between the inner land portions 16 adjacent to each other in the tire circumferential direction. There is.

Here, as shown in FIG. 3, each inner land portion 1
The end portion (groove wall) of the tire 6 on the tire axial direction end side is inclined outward in the tire axial direction at a predetermined inclination angle θ1.

It is preferable that the inclination angle θ1 is set to 30 degrees or more and 70 degrees or less with respect to the tire normal (l) direction.

On the other hand, on the outer side in the tire axial direction of each inner land portion 16, an outer land portion 20 whose axis is inclined with respect to the tire circumferential direction is formed. A plurality of the outer land portions 20 are formed along the tire circumferential direction.

A second inclined groove 22 extending from the tire center side toward the tire axial end portion at a predetermined inclination angle is formed between the outer land portions 20 adjacent to each other in the tire circumferential direction. There is.

The second inclined groove 22 is connected to the first inclined groove 18, and the first inclined groove 18 and the second inclined groove 22 serve as one lug groove extending in the tire axial direction. It is functioning.

Here, as shown in FIG. 3, each outer land portion 2
In 0, the tire axial direction center side is inclined toward the tire axial direction inner side at a predetermined inclination angle θ2.

It is preferable that the inclination angle θ2 is set to be not less than 5 degrees and not more than 50 degrees with respect to the tire normal (l) direction within a range not larger than the inclination angle θ1.

Further, the end portion of each outer land portion 20 on the tire axial center side is connected to the inclined surface 16A of each inner land portion 16 on the tire axial end portion side.

That is, the end portion of each outer land portion 20 on the tire axial center side rides on the inclined surface 16A of each inner land portion 16 on the tire axial end portion side, and is partially over. It is formed by wrapping.

The inner land portion 16 and the outer land portion 20 are in one-to-one correspondence with one outer land portion 20 connected to one inner land portion 16.

Thus, each outer land portion 20 and inner land portion 1
6, the inclined surface 20A on the tire axial direction center side of the outer land portion 20 and the tire axial direction end portion side inclined surface 16A of each inner land portion 16 are connected to each other.
A plurality of circumferential grooves 24 having a substantially V-shaped cross section are formed along the tire circumferential direction with the groove walls on both sides being 0A and the inclined surface 16A.

The depth of the circumferential groove 24 is set to 10% or more and 80% or less of the depth of the first inclined groove 18.

Next, the pneumatic tire 1 according to this embodiment
The action and effect of 0 will be described.

According to the pneumatic tire 10 of the present invention, since the inclined surface 16A is formed on the tire axial direction end portion side of the inner side land portion 16, the tire axial direction end portion side end portion is in the tire radial direction. The volume of the inner land portion 16 can be increased as compared to the case where it is formed (when it is not inclined).
The rigidity of 6 can be improved.

As a result, steering stability on dry road surface (dry steering stability) can be improved and
Uneven wear can be reduced and uneven wear can be improved.

Similarly, since the inclined surface 20A is formed on the tire center side of the outer land portion 20, the volume of the outer land portion 20 can be increased and the rigidity of the outer land portion 20 can be improved. .

As a result, steering stability on dry road surface (dry steering stability) can be improved, and
Uneven wear can be reduced and uneven wear can be improved.

On the other hand, since the circumferential groove 24 is formed by the inclined surface 20A of the outer side land portion 20 on the tire axial direction center side and the inclined surface 16A of the inner side land portion 16 on the tire axial direction end side, for example, rain. When traveling on a wet road surface, water on the surfaces (treads) of the inner land portion 16 and the outer land portion 20 flows into the circumferential groove 24. The water flowing into the circumferential groove 24 flows in the tire circumferential direction and then flows into the adjacent first inclined groove 18. The water that has flowed into the first inclined groove 18 is the second inclined groove 2
2 and is discharged to the outside from the second inclined groove 22.

Thus, the inner land portion 16 and the outer land portion 2 are
Even if the rigidity of 0 is improved, the drainage channel can be secured, and the deterioration of the drainage property can be prevented.

In particular, in the present invention, the inclination angle θ1 of the inclined surface 16A on the tire axial end side of each inner land portion 16 is set to 30 degrees or more and 70 degrees or less with respect to the tire normal (l) direction. Therefore, it is possible to improve the rigidity of the inner land portion 16 and prevent the drainage property from decreasing.

Further, within the range in which the inclination angle θ2 of the inclined surface 20A on the tire axial direction center side of each outer land portion 20 does not become larger than the inclination angle θ1, it is 5 with respect to the tire normal (l) direction.
The outside land part 20
It is possible to achieve both the improvement in rigidity and the prevention of deterioration of drainage.

Further, the inclination angle θ1 of the inclined surface 16A of the inner land portion 16 on the axial end side of the tire with respect to the tire normal (l) direction is the tire method of the inclined surface 20A of the outer land portion 20 on the tire axial center side. Since it is set to be larger than the inclination angle θ2 with respect to the line (l) direction, it is possible to avoid deterioration of drainage.

As described above, the pneumatic tire 1 of the present invention
According to 0, it is possible to prevent deterioration of wet drainage property, suppress uneven wear, and improve uneven wear property and dry steering stability. [Second Embodiment] Next, a pneumatic tire according to a second embodiment of the present invention will be described.

The same components as those of the pneumatic tire 10 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIGS. 4 and 5, in the pneumatic tire 30 of this embodiment, the outer land portion 20 and the inner land portion 16 are arranged.
Is different from the pneumatic tire 10 of the first embodiment.

In the pneumatic tire 30 of this embodiment, 1
Two outer land portions 20S, 20 for one inner land portion 16
Ts are connected and have a one-to-two correspondence.

That is, the two outer land portions 20S, 20T adjacent in the tire circumferential direction to the inclined surface 16A inclined at the inclination angle θ1 on the tire axial direction end side of one inner land portion 16 on the tire axial direction center side. The ends overlap.

Incidentally, the pneumatic tire 10 of the first embodiment.
Similarly to the above case, the inclined surface 20A on the tire axial direction center side of each of the outer land portions 20S and 20T is inclined at the inclination angle θ2.

In the pneumatic tire 30 of the present invention, the inclined surface 16A of the inner land portion 16 on the axial end side of the tire and the inclined surface 20A of the outer land portions 20S and 20T on the tire axial center side are provided on both sides of the groove wall. The inner circumferential portion 16 has one circumferential groove 24
In, the two are formed so as to be separated in the tire circumferential direction.

According to the pneumatic tire 30 of the present embodiment, one inner land portion 16 and two outer land portions 20 are provided.
Since S and 20T are connected, as compared with the pneumatic tire 10 of the first embodiment in which one outer land portion 20 is connected to one inner land portion 16, connection is made in the tire axial direction. The rigidity of the entire inner land portion 16 and the outer land portion 20 forming a pair becomes substantially equal.

Therefore, the difference in rigidity between the pair of the inner land portion 16 and the outer land portion 20 adjacent to each other in the tire circumferential direction is reduced, and uneven wear can be suppressed. As a result, the uneven wear resistance can be improved and the dry steering stability can be improved. [Third Embodiment] Next, a pneumatic tire according to a third embodiment of the present invention will be described.

The same components as those of the pneumatic tire 10 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIGS. 6 and 7, in the pneumatic tire 50 of this embodiment, the center rib 1 extending in the tire circumferential direction is the same as the pneumatic tire 10 of the first embodiment.
2 is formed.

On the outer side of the center rib 12 in the tire axial direction, first main grooves 14A extending in the tire circumferential direction are formed.

On the outer side of the first main groove 14A in the tire axial direction, a plurality of central land portions 52 whose axial direction is inclined with respect to the tire circumferential direction are formed along the tire circumferential direction. Between these adjacent central land portions 52, the first inclined groove 1
8 is formed.

Second main grooves 14B extending in the tire circumferential direction are formed outside the central land portion 52 in the tire axial direction. That is, the first main groove 14A and the second main groove 1
4B is connected (communicated) with the first inclined groove 18.

On the outer side of the second main groove 14B in the tire axial direction, a rib-like inner land portion 54 continuous along the tire circumferential direction.
Are formed respectively.

The inclined surface 54A (groove wall) of the inner land portion 54 on the tire axial end side is the pneumatic tire 1 of the first embodiment.
As in the case of the inner land portion 16 of 0, the predetermined inclination angle θ1
(See FIG. 3), the tire is inclined outward in the axial direction.

It is preferable that the inclination angle θ1 is set to 30 degrees or more and 70 degrees or less with respect to the tire normal (l) direction.

On the other hand, on the outer side in the tire axial direction of each inner land portion 54, an outer land portion 20 whose axis is inclined with respect to the tire circumferential direction is formed. A plurality of the outer land portions 20 are formed along the tire circumferential direction.

The inclined surface 20A (groove wall) on the tire axial center side of each outer land portion 20 has a predetermined inclination angle θ, as in the case of the outer land portion 20 of the pneumatic tire 10 of the first embodiment.
No. 2 (see FIG. 3) is inclined inward in the tire axial direction.

The inclination angle θ2 is preferably set to 5 degrees or more and 50 degrees or less with respect to the tire normal (l) direction within a range not larger than the inclination angle θ1.

Further, the end portion of each outer land portion 20 on the tire axial direction center side is connected to the inclined surface 54A of each inner land portion 54 on the tire axial direction end portion side.

That is, the end portion of each outer land portion 20 on the tire axial center side rides on the inclined surface 54A of each inner land portion 54 on the tire axial end portion side, and overlaps in part. Is formed.

A second inclined groove 22 extending toward the tire axial end is formed at a predetermined inclination angle between the outer land portions 20 adjacent to each other in the tire circumferential direction.

In the pneumatic tire 50 of this embodiment, unlike the pneumatic tire 10 of the first embodiment, the first inclined groove 18 and the second inclined groove 22 are connected (communication). Absent.

As described above, in the pneumatic tire 50 of this embodiment, one inner land portion 54 is formed with circumferential grooves 24 as many as the outer land portions 20.

According to the pneumatic tire 50 of this embodiment, the inner land portion 54 is formed as one rib-shaped block, and all the outer land portions 20 are connected to the inner land portion 54. It is possible to minimize variations in the rigidity of the outer land portion 20 and the inner land portion 54 along the circumferential direction.

As a result, uneven wear can be suppressed more effectively, uneven wear resistance can be improved, and dry steering stability can be improved.

In particular, since the plurality of outer land portions 20 are connected to one inner land portion 54, it is possible to improve the traction performance in dry steering stability. As a result, uneven wear can be suppressed more efficiently and uneven wear performance can be improved, and the vicinity of the end of the inner land portion 54, which is a rib-shaped block, on the tire axial end side is an inclined surface. Due to this, drainage performance is improved, and wet steering stability and wet high-prevention property can be improved. [Fourth Embodiment] Next, a pneumatic tire according to a fourth embodiment of the present invention will be described.

The same components as those of the pneumatic tire 10 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIGS. 8 and 9, the pneumatic tire 70 of this embodiment is basically based on the tread pattern of the pneumatic tire 30 of the second embodiment,
The ridgeline (g) of the inner land portion 16 is inclined with respect to the tire circumferential direction.

In particular, in the pneumatic tire 70 of the present embodiment, as shown in FIG. 9, the inclination angle θ3 of the ridge line g is set within − (minus) 10 degrees or more and within + (plus) 45 degrees.

According to the pneumatic tire 70 of this embodiment, it is possible to prevent the drainage property and the block rigidity of the inner land portion 16 from being lowered. (Example 1) Next, an example of each dimension of the tread pattern of each pneumatic tire described in each of the above-described embodiments will be described below.

Table 1 below shows an example of each dimension.

The tire size is PSR2.
It is 05 / 55R16, and the tread width is 140 mm as an example. Further, the tire is subjected to the internal pressure and load of JATMA standard measurement.

The tread pattern of the conventional pneumatic tire 100 is shown in FIG.
The end portion on the tire axial direction end side is not connected to the end portion on the tire axial direction center side of the outer land portion 104, and the circumferential groove 24 is not formed.

[0151]

[Table 1] (Test Example 1) Next, a description will be given of a test in which wet high pres during straight line, wet high pre during cornering, and dry steering stability are tried.

As a test condition, the pneumatic tire according to each of the above embodiments set to an internal pressure of 220 (kPa) was mounted on a vehicle, and two passengers were seated in the front seats.

Here, the "evaluation of wet high pres on straight line" is a feeling evaluation of the critical speed at which the hydroplaning (high pre) phenomenon occurs when passing through a wet road having a water depth of 10 mm.

Further, "evaluation of wet high pre at cornering" is a measurement result of the lateral limit G at which the high pre phenomenon occurs when passing through a wet road having a water depth of 6 mm and a radius of 80 m.

The "evaluation of dry steering stability" means
This is a test driver's feeling evaluation when driving on a dry circuit course in various driving modes.

The results of this test are shown in Table 2 below.

The numerical values in Table 2 are 1 for the conventional pattern.
The evaluation is based on 00 (standard), and the larger the value, the better the evaluation.

[0158]

[Table 2]

As shown in Table 2 above, in Patterns A to D, which are the pneumatic tires of the present invention, the conventional patterns were used for all evaluations of wet high pre (straight line), wet high pre (corner ring) and dry steering stability. It turned out to have risen.

From the above, it can be said that the pneumatic tire of the present invention can prevent deterioration of wet drainage property and improve uneven wear resistance and dry steering stability. [Fifth Embodiment] Next, a pneumatic tire according to a fifth embodiment of the present invention will be described.

The same components as those of the pneumatic tire according to the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 10, the pneumatic tire 80 of this embodiment has a first main groove 14A and a second main groove 14B.
Between the first main groove 14A, the second main groove 14B, the inclined groove 18 that inclines with respect to the tire axial direction, and the front land portion 82 and the rear land that are defined by the axial groove 86 described later. The portion 84 is arranged.

In FIG. 10, the arrow A direction is the tire rotation direction.

Here, as shown in FIG. 10 and FIG. 11, the front land portion 82 has an inclination inclined toward the rear in the tire rotation direction at a predetermined inclination angle θ1 near the rear end in the tire rotation direction. The surface 82A is formed.

It is preferable that the inclination angle θ1 is set to 30 degrees or more and 70 degrees or less with respect to the tire normal (l) direction.

On the other hand, in the rear land portion 84, an inclined surface 84A which is inclined forward at a predetermined angle θ2 is formed near the front end in the tire rotation direction.

It is preferable that the inclination angle θ2 is set to be not less than 5 degrees and not more than 50 degrees with respect to the tire normal (l) direction within a range not larger than the inclination angle θ1.

Further, the rear end of the rear land portion 84 in the tire rotation direction is connected to the inclined surface 82A of the front land portion 82.

That is, the front end of the rear land portion 84 in the tire rotation direction rides on the inclined surface 82A of the front land portion 82, and is formed so as to partially overlap.

Therefore, the rear land portion 84 and the front land portion 82
Between the inclined surface 84A of the rear land portion 84 and the front land portion 8
An axial groove 86 having a substantially V-shaped cross section is formed extending along the tire axial direction with the two inclined surfaces 82A as groove walls on both sides.

The depth of the axial groove 86 is 10% or more of the depth of the first main groove 14A and the second main groove 14B.
It is set within%. (Operation) Next, the operation and effect of the pneumatic tire 80 according to the present embodiment will be described.

According to the pneumatic tire 80 of the present invention, since the vicinity of the front land portion 82 on the rear side in the tire rotation direction is inclined, the end portion is formed in the tire radial direction (end portion). The volume of the front land portion 82 can be increased and the rigidity of the front land portion 82 can be improved as compared with the case where the vicinity is not inclined.

As a result, the steering stability on a dry road surface (dry steering stability) can be improved, and
Uneven wear can be reduced and uneven wear can be improved.

Similarly, since the rear land portion 84 is inclined near the front end in the tire rotation direction, the volume of the rear land portion 84 can be increased and the rigidity of the rear land portion 84 can be improved. You can

As a result, the steering stability on a dry road surface (dry steering stability) can be improved, and
Uneven wear can be reduced and uneven wear can be improved.

On the other hand, since the axial groove 86 is formed by the inclined surface 82A of the front land portion 82 and the inclined surface 84A of the rear land portion 84, for example, when traveling on a road surface wet with rain, the front land portion 82 is formed. Water on the surface (tread) of the rear land portion 84 flows into the axial groove 86.

The water flowing into the axial groove 86 flows in the axial direction of the tire, flows into the adjacent first main groove 14A and second main groove 14B, and is discharged to the outside.

As described above, the front land portion 82 and the rear land portion 8 are
Even when the rigidity of No. 4 is improved, the drainage channel can be secured, and the deterioration of the drainage property can be prevented.

Particularly, in the present invention, the inclination angle θ1 of the inclined surface 82A on the rear side in the tire rotation direction of the front land portion 82 is set to be 30 degrees or more and 70 degrees or less with respect to the tire normal (l) direction. Therefore, it is possible to improve the rigidity of the front land portion 82 and prevent the drainage property from decreasing.

Further, within the range in which the inclination angle θ2 of the inclined surface 84A on the front side in the tire rotation direction of the rear land portion 84 does not become larger than the inclination angle θ1, the tire normal (l) direction is 5
Since it is set above 50 degrees and below 50 degrees, the rear land part 84
It is possible to achieve both the improvement in rigidity and the prevention of deterioration of drainage.

Further, the inclination angle θ1 of the inclined surface 82A of the front land portion 82 with respect to the tire normal (l) direction is the rear land portion 8
Since the inclination angle θ2 of the inclined surface 84A of No. 4 with respect to the tire normal (l) direction is set to be larger, it is possible to avoid deterioration of drainage performance.

As described above, the pneumatic tire 8 of the present invention
According to 0, it is possible to prevent deterioration of wet drainage property, suppress uneven wear, and improve uneven wear property and dry steering stability. [Sixth Embodiment] The same components as those of the pneumatic tire according to the above-described embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 12, the pneumatic tire 88 of the present embodiment is the pneumatic tire 80 of the fifth embodiment.
In the above, the circumferential narrow groove 90 extending along the tire circumferential direction is formed in the tire axial direction central portion of the rear land portion 84.

The circumferential narrow groove 90 crosses the rear land portion 84 in the tire circumferential direction and divides the rear land portion 84 into two in the tire axial direction.

In this embodiment, since the circumferential narrow groove 90 is formed in the center of the rear land portion 84, a part of the water in the axial groove 86 (see FIG. 12) can be made to flow to the inclined groove 18, and the wet performance can be improved. Is further improved. [Seventh Embodiment] Next, a pneumatic tire according to a seventh embodiment of the present invention will be described.

The same components as those of the pneumatic tire according to the above-described embodiment are designated by the same reference numerals, and the description thereof will be appropriately omitted.

As shown in FIG. 13, in the pneumatic tire 92 of this embodiment, the first main groove 14A and the second main groove 14 are formed.
Between B and B, a plurality of inclined grooves 94 that are inclined in the same direction as the adjacent second inclined groove 22 and have an angle with respect to the tire circumferential direction that is smaller than that of the second inclined groove 22 are formed in the tire circumferential direction.

The inclined grooves 94 are arranged from the second main groove 14B to the first main groove 14B.
Extending toward the main groove 14A side and terminating near the first main groove 14A.

Between the first main groove 14A and the second main groove 14B, there is a rear land portion 96 defined by the second main groove 14B, the inclined groove 94, and an axial groove 95 described later. Is disposed on the tire equatorial plane CL side of the rear land portion 96 and is partitioned by the inclined groove 94, an axial groove 95 described below, and the first main groove 14A, and forms a substantially triangular triangular portion 98 that is long in the tire circumferential direction. A front land portion 99 is arranged so as to be continuous in the tire circumferential direction.

Here, as shown in FIGS. 13 and 14, the inclined groove 94 is formed in the triangular portion 98 of the front land portion 99.
An inclined surface 98A that inclines rearward in the tire rotation direction at a predetermined inclination angle θ1 is formed in the vicinity of the rear end (side) in the tire rotation direction that is inclined in the opposite direction.

It is preferable that the inclination angle θ1 is set to 30 degrees or more and 70 degrees or less with respect to the tire normal (l) direction.

On the other hand, in the rear land portion 96, an inclined surface 96A which is inclined forward at a predetermined angle θ2 is formed near the front end portion in the tire rotation direction.

It is preferable that the inclination angle θ2 is set to be not less than 5 degrees and not more than 50 degrees with respect to the tire normal (l) direction within a range not larger than the inclination angle θ1.

Further, the rear end of the rear land portion 96 in the tire rotation direction is connected to the inclined surface 98A of the triangular portion 98.

That is, the front end portion of the rear land portion 96 in the tire rotation direction rides on the inclined surface 98A of the triangular portion 98 and is formed so as to partially overlap.

Therefore, the rear land portion 96 and the triangular portion 98
Between the inclined surface 96A of the rear land portion 96 and the triangular portion 9
An axial groove 95 having a substantially V-shaped cross section is formed, which is inclined with respect to the tire axial direction and has groove surfaces on both sides of the inclined surface 98 </ b> A.

The depth of the axial groove 95 is 10% or more of the depth of the first main groove 14A and the second main groove 14B.
It is set within%. (Operation) Next, the operation and effect of the pneumatic tire 92 according to the present embodiment will be described.

According to the pneumatic tire 92 of the present invention, since the triangular portion 98 of the front land portion 99 is inclined near the end portion on the rear side in the tire rotation direction, the end portion is formed in the tire radial direction. The volume of the triangular portion 98 of the front land portion 99 can be increased and the rigidity of the front land portion 99 can be improved as compared with the case (when the vicinity of the end is not inclined).

As a result, the steering stability on a dry road surface (dry steering stability) can be improved, and
Uneven wear can be reduced and uneven wear can be improved.

Similarly, since the vicinity of the front end of the rear land portion 96 in the tire rotation direction is inclined, the volume of the rear land portion 96 can be increased and the rigidity of the rear land portion 96 can be improved. You can

As a result, the steering stability on a dry road surface (dry steering stability) can be improved and
Uneven wear can be reduced and uneven wear can be improved.

On the other hand, since the axial groove 95 is formed by the inclined surface 98A of the triangular portion 98 and the inclined surface 96A of the rear land portion 96, for example, when traveling on a road surface wet with rain, the front land portion 99 and Water on the surface (tread) of the rear land portion 96 flows into the axial groove 95.

The water flowing into the axial groove 95 flows into the inclined grooves 94 on both sides and is discharged to the outside through the second main groove 14B and the second inclined groove 22.

Thus, the triangular portion 98 and the rear land portion 9 are
Even when the rigidity of No. 6 is improved, the drainage channel can be secured and the deterioration of the drainage property can be prevented.

Particularly, in the present invention, the inclination angle θ1 of the inclined surface 98A of the triangular portion 98 of the front land portion 99 on the rear side in the tire rotation direction is 30 degrees or more with respect to the tire normal line (l) direction.
Since it is set within the range, it is possible to improve the rigidity of the front land portion 99 and prevent the drainage property from decreasing.

Further, within the range in which the inclination angle θ2 of the inclined surface 96A on the front side in the tire rotation direction of the rear land portion 96 does not become larger than the inclination angle θ1, it is 5 with respect to the tire normal (l) direction.
Since it is set to more than 50 degrees and less than 50 degrees, the rear land part 96
It is possible to achieve both the improvement in rigidity and the prevention of deterioration of drainage.

Further, the inclination angle θ1 of the inclined surface 98A of the triangular portion 98 with respect to the tire normal (l) direction is determined by the rear land portion 9
Since the inclination angle θ2 of the inclined surface 96A of No. 6 with respect to the tire normal line (l) direction is set to be larger, it is possible to avoid deterioration of drainage performance.

As described above, the pneumatic tire 9 of the present invention
According to No. 2, it is possible to prevent deterioration of wet drainage, suppress uneven wear, and improve uneven wear and dry steering stability. (Example 2) Next, an example of each dimension of the tread pattern of each pneumatic tire described in each of Embodiments 5 to 7 will be described below.

Table 3 below shows an example of each dimension.

The tire size is PSR2.
It is 05 / 55R16, and the tread width is 140 mm as an example. Further, the tire is subjected to the internal pressure and load of JATMA standard measurement.

[0211]

[Table 3] (Test Example 2) Next, with respect to the pneumatic tires according to the fifth embodiment to the seventh embodiment, the same test as the above-mentioned Test Example 1 was conducted.

The results of this test are shown in Table 4 below.

The numerical values in Table 4 are evaluations with the conventional pattern (the same as in Test Example 1) set to 100 (reference), and the larger the numerical value, the better the evaluation.

[0214]

[Table 4]

As shown in Table 4 above, in Patterns E to G which are the pneumatic tires of the present invention, the conventional patterns were used for all evaluations of wet high pre (straight line), wet high pre (corner ring) and dry steering stability. It turned out to have risen.

From the above, it can be said that the pneumatic tire of the present invention can prevent deterioration of wet drainage property and improve uneven wear resistance and dry steering stability. [Other Embodiments] In the above-described embodiment, the inclined surface of the land portion is planar and inclined at a constant angle, but the present invention is not limited to this. For example, as shown in FIG.
The inclined surface 20 (similarly to the inclined surface of other embodiments) may be a curved surface.

[0217]

According to the pneumatic tire of the present invention, it is possible to prevent deterioration of wet drainage, suppress uneven wear, and improve uneven wear and dry steering stability.

[Brief description of drawings]

FIG. 1 is a plan view showing a tread pattern of a pneumatic tire according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a part of the tread pattern of the pneumatic tire according to the first embodiment of the present invention.

FIG. 3 is a side view of an inner land portion and an outer land portion of the pneumatic tire according to the first embodiment of the present invention.

FIG. 4 is a plan view showing a tread pattern of a pneumatic tire according to a second embodiment of the present invention.

FIG. 5 is a plan view showing a part of a tread pattern of a pneumatic tire according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a tread pattern of a pneumatic tire according to a third embodiment of the present invention.

FIG. 7 is a plan view showing a part of a tread pattern of a pneumatic tire according to a third embodiment of the present invention.

FIG. 8 is a plan view showing a tread pattern of a pneumatic tire according to a fourth embodiment of the present invention.

FIG. 9 is a plan view showing a part of a tread pattern of a pneumatic tire according to a fourth embodiment of the present invention.

FIG. 10 is a plan view showing a part of a tread pattern of a pneumatic tire according to a fifth embodiment of the present invention.

FIG. 11 is a side view of an inner land portion and an outer land portion of a pneumatic tire according to a fifth embodiment of the present invention.

FIG. 12 is a plan view showing a part of a tread pattern of a pneumatic tire according to a sixth embodiment of the present invention.

FIG. 13 is a plan view showing a part of a tread pattern of a pneumatic tire according to a seventh embodiment of the present invention.

FIG. 14 is a side view of a rib and a rear land portion of a pneumatic tire according to a seventh embodiment of the present invention.

FIG. 15 is a side view of a land portion of a pneumatic tire according to another embodiment.

FIG. 16 is a plan view showing a tread pattern of a conventional pneumatic tire.

[Explanation of symbols]

10 pneumatic tires 12 ribs (land) 16 Inner land area (land area) 18 First inclined groove (inclined groove) 20 Outer land area (land area) 22 Second inclined groove (inclined groove) 24 circumferential groove 30 pneumatic tires 50 pneumatic tires 54 Inner land area (land area) 70 pneumatic tires 80 pneumatic tires 82 Forward land area (land area) 84 Rear land area (land area) 86 axial groove 88 pneumatic tires 92 pneumatic tires 94 inclined groove 95 axial groove 96 Rear land area (land area) 99 Forward land area (land area)

Claims (17)

[Claims] 1. A pneumatic tire having at least two land portions adjacent to each other on a tread, wherein one of the end portions of the land portion adjacent to the other land portion has the other land portion. An inclined surface that is inclined toward the portion, an end surface on the one land portion side of the end portions of the other land portion, an inclined surface that is inclined toward the one land portion is formed, The pneumatic tire, wherein an end of the one land portion on the side of the other land portion is connected to the inclined surface of the other land portion. 2. A tread having at least two land portions adjacent to each other in the tire axial direction, and a tire axially outer side near an end portion on the tire axially outer side of an inner land portion located on the tire axial center side. An inner land portion inclined surface that is inclined toward the outer land portion that is located is formed, and an outer land portion inclined surface that is inclined toward the inner land portion is formed in the vicinity of an end portion on the tire axial direction center side of the outer land portion. 2. The pneumatic tire according to claim 1, wherein the inner land portion side end portion of the outer land portion is connected to the inner land portion slope. 3. The air according to claim 2, wherein the inclination angle of the inner land inclined surface with respect to the tire normal direction is larger than the inclination angle of the outer land inclined surface with respect to the tire normal direction. Included tires. 4. The inclination angle of the inner land inclined surface with respect to the tire normal direction is 30 degrees or more and 70 degrees or less, and the inclination angle of the outer land portion inclined surface with respect to the tire normal direction is 5 degrees or more and 50 degrees or less. The pneumatic tire according to claim 3, wherein 5. The depth of the circumferential groove that is formed by the inner land portion inclined surface and the outer land portion inclined surface and extends in the tire circumferential direction is the depth of the groove that divides the inner land portion and the outer land portion. The pneumatic tire according to any one of claims 2 to 4, wherein the pneumatic tire is set to be 10% or more and 80% or less of the height. 6. The pneumatic tire according to claim 2, wherein the ridgeline of the inner land portion is inclined with respect to the tire circumferential direction. 7. The pneumatic tire according to claim 6, wherein the ridgeline of the inner land portion has an inclination angle of −10 degrees or more and +45 degrees or less with respect to the tire circumferential direction. 8. The end portion on the tire axial direction center side of the plurality of outer land portions is connected to one of the inner land portion inclined surfaces, according to any one of claims 2 to 7. Either one
The pneumatic tire according to item. 9. The inner land portion is one rib-shaped block continuously formed in the tire circumferential direction, according to any one of claims 2 to 8. Pneumatic tires. 10. At least two adjacent to each other in the tire circumferential direction.
There are two land parts on the tread, and among the end parts of the front land part located on the front side in the tire rotation direction, near the end part on the rear side in the tire rotation direction, the front land part inclination that inclines rearward in the tire rotation direction. A surface is formed, and a rear land portion inclined surface that inclines forward in the tire rotation direction is formed near the front end in the tire rotation direction out of the ends of the rear land portion located on the rear side in the tire rotation direction. The pneumatic tire according to claim 1, wherein an end portion of the rear land portion on the front side in the tire rotation direction is connected to the front land portion inclined surface. 11. The air according to claim 10, wherein an inclination angle of the front land sloped surface with respect to a tire normal direction is larger than an inclination angle of the rear land sloped surface with respect to a tire normal direction. Included tires. 12. The tilt angle of the front land slope surface with respect to the tire normal direction is 30 degrees or more and 70 degrees or less, and the tilt angle of the rear land slope surface with respect to the tire normal direction is 5 degrees or more and 50 degrees or less. The pneumatic tire according to claim 11, wherein 13. The depth of an axial groove formed by the front land portion inclined surface and the rear land portion inclined surface and extending in the tire axial direction is determined by the depth of the groove that divides the front land portion and the rear land portion. The pneumatic tire according to any one of claims 10 to 12, wherein the pneumatic tire is set to be 10% or more and 80% or less of the height. 14. The pneumatic tire according to claim 10, wherein the ridgeline of the front land portion is inclined with respect to the tire axial direction. 15. The ridgeline of the front land portion has an inclination angle with respect to the tire axial direction of −45 degrees or more and +45 degrees or less.
The pneumatic tire according to claim 14, wherein 16. The tire axial direction center side end of the plurality of the rear land portions is connected to one of the front land portion inclined surfaces, according to any one of claims 10 to 15. The pneumatic tire according to any one of items. 17. The front land portion is a single rib-shaped block that is continuous in the tire circumferential direction and is formed by repeatedly increasing and decreasing the width. The pneumatic tire according to any one of items.