JP2000127714A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire to reduce the generation of noises with hydro-planing performance maintained. SOLUTION: In this tire, left and right protrusion parts 32L and 32R are formed on the central vertical rib 21 of a tread 20 and intermediate block trains 24L and 24R and shoulder block trains 27L and 27R are formed in array in a peripheral direction on the left and the right of the rib 21 through vertical main grooves 22L and 22R and vertical auxiliary grooves 25L and 25R. This constitution reduces the generation of pattern noise with hydro-planing performance maintained, namely, improves frequency dispersion and suppresses the generation of noise through reduction of columnar resonance noise, and improves high steering angle cornering performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pneumatic tire,
In particular, the present invention relates to a pneumatic tire suitable for use as a tire for a passenger car, a racing car, or the like by reducing air column resonance sound and improving large steering angle cornering performance while maintaining hydroplaning performance.

[0002]

2. Description of the Related Art FIG. 5 shows a tread pattern of a pneumatic tire (pneumatic radial tire). In FIG. 5, a straight vertical rib 2 continuous in the tire circumferential direction is formed in the center of the tread 1 so as to protrude, and left and right outer sides of the vertical rib 2 are continuous right and left linearly in the tire circumferential direction. Block 4 in the tire circumferential direction through the vertical main grooves 3L, 3R of
Left and right intermediate block rows 5L,
5R is formed as a ridge, and the left and right intermediate block rows 5L and 5R are formed.
Left and right shoulder block rows 8L, 8R formed by arranging shoulder blocks 7L, 7R in the tire circumferential direction via left and right vertical sub-grooves 6L, 6R that are linearly continuous in the tire circumferential direction on the left and right outer sides of R. The rib block pattern formed as ridges is constituted by, for example, frequency dispersion theory.

[0003]

When the shoulder blocks 7L and 7R constituting the shoulder block arrays 8L and 8R are large and the number of blocks per tire circumference is small as in the tire shown in FIG.
There is a problem that the pattern noise and the road noise increase due to the sound generated in the lateral grooves 9L and 9R of the L and 8R and the vibration sound caused by the strength of the block rigidity.

Further, when the shoulder blocks 7L and 7R are completely divided into two by the lateral narrow grooves 10L and 10R, there is a problem that the large steering angle cornering performance is reduced. Further, in order to reduce the rigidity of the intermediate blocks 4L, 4R, the cuts 11L, 1
When 1R is formed, the air in the cut groove is compressed at the time of grounding, and a plosive sound is generated, resulting in a problem that pattern noise is increased.

Further, the vertical main grooves 3L and 3R and the vertical sub grooves 6
Since both L and 6R have a linear shape, there is a problem that the air column resonance also increases. In the air column resonance, air in the air column formed between the vertical groove and the road surface on the tire contact surface resonates due to the excitation force by the tire pattern during tire rolling and the input from the road surface, A sound having a wavelength about twice as long as the length of the pillar is generated, which is unpleasant for passenger car tires.
It is the main sound source of the noise of 0 Hz to 1 KHz.

[0006] The wavelength of the air column resonance sound becomes substantially constant frequency irrespective of the speed of the tire, and the inside sound and outside sound are increased. If the number and volume of the longitudinal grooves are reduced to prevent the air column resonance, the wet grip performance, particularly the performance of preventing the hydroplaning phenomenon that occurs when traveling at high speed on a wet road surface, is reduced.

In view of the above, the present invention provides a vertical rib at the center of the tread in the circumferential direction of the tire, and a right and left intermediate block row via vertical main grooves formed on the left and right of the vertical rib. Targeting a pneumatic tire having a tread pattern provided with left and right shoulder block rows via vertical sub-grooves on the left and right sides of the target, devising the arrangement and shape of the intermediate block and the shoulder block and devising the shape of the vertical groove By doing so, it is an object to provide a pneumatic tire capable of reducing pattern noise (noise), improving large steering angle cornering performance, and suppressing uneven wear of a shoulder block without lowering hydroplaning performance. is there.

[0008]

In order to achieve the above-mentioned object, the present invention employs the following technical means. That is, the pneumatic tire according to claim 1 is provided with the vertical ribs 21 which are continuous in the tire circumferential direction at the center of the tread 20 and protrude from the left and right outer sides of the vertical ribs 21 in the tire circumferential direction. Left and right intermediate block rows 24L and 24R, which are configured by arranging blocks 23L and 23R in the tire circumferential direction via left and right vertical grooves 22L and 22R, are provided so as to protrude, and the left and right outer side of the left and right intermediate block rows 24L and 24R. Left and right shoulder block rows 27L, 27R in which shoulder blocks 26L, 26R are arranged in the tire circumferential direction via left and right vertical sub-grooves 25L, 25R continuous in the tire circumferential direction.
The left and right intermediate block rows 24L, 2
4R are provided with the lateral grooves 28L, 28R,
Three blocks 23L and 23R via 29L and 29R
Are arranged, and the left and right shoulder block rows 27L,
27R, the lateral grooves 30L, 30R, 31L, and 31R are formed at a pitch P2 in the circumferential direction, which is equal to the pitch P1 in the circumferential direction.
Two shoulder blocks 26L, 26 via 31R
R are arranged, and the vertical rib 21, the intermediate block 2
3L, 23R and shoulder blocks 26L, 26R
Any of the raised portions 32L, 32R, 3 for reducing the groove width of the left and right vertical main grooves 22L, 22R or the left and right vertical sub-grooves 25L, 25R to cut the wavelength of the air column resonance.
3L, 33R, 34L, 34R are formed at intervals in the tire circumferential direction.

The intermediate blocks 23L and 23R and the shoulder blocks 26L and 26R each have three inside sides (inside when the tire is mounted on the car) and three outside sides (outside when the tire is mounted on the car). : 2
Since the number of the arrangement patterns is equal to one another, it is effective for frequency dispersion of pattern noise. In addition, the vertical ribs 21, the intermediate blocks 23L and 23R, and the shoulder blocks 26L,
26R, the vertical main grooves 22L, 22R or the vertical auxiliary grooves 25L,
Ridges 32L, 32R, 33 for reducing the groove width of 25R
Since the L, 33R, 34L, and 34R are formed at intervals in the tire circumferential direction, the wavelength of the air column resonance is cut, and noise reduction can be expected.

The ridges 32L, 32R, 33L, 33
It is sufficient that at least one of R, 34L, and 34R is formed (positioned) on the tire contact surface (usually, a horizontally long ellipse). The pneumatic tire according to claim 2 is the same as the above-described claim 1 except that the intermediate block row 2
Lateral grooves 28L, 28R, 29L, 29R of 3L, 23R and lateral grooves 3 of the shoulder block rows 27L, 27R.
0L, 30R, 31L, and 31R have receding angles θ1, θ2, θ3, and θ4 with respect to the tire rotation direction F, and the lateral grooves 28L and 28R that constitute one pitch P1 of the intermediate block rows 24L and 24R. The receding angle θ1 is larger than the receding angle θ2 of the intermediate lateral grooves 29L and 29R within one pitch P1, and the shoulder block rows 27L and 27
The receding angle θ3 of the lateral grooves 30L and 30R constituting one pitch P2 of R is set to be larger than the receding angle θ4 of the intermediate lateral grooves 31L and 31R within one pitch P2.

[0011] Here, the sweepback angle means that the outer end (drain port side) of the lateral groove is grounded later (later) than the inner end (water collection port) when the tire rotates, in the longitudinal direction of the groove. An angle (intersection angle) between the component and the component in the tire rotation direction. If this intersection angle is 90 °, the lateral groove is formed parallel to the tire axial direction (that is, the inner and outer ends of the lateral groove are grounded simultaneously. )
Therefore, the sweep angle is 90 ° or less and 9
As the angle approaches 0 °, the inclination of the lateral groove becomes gentler, and the drainage effect during traveling (during rotation) deteriorates. On the other hand, 90 °
The greater the distance from the side, the steeper the inclination of the lateral groove, and the better the drainage performance.

According to the pneumatic tire of the second aspect, the large steering angle cornering performance is improved, and the uneven wear of the shoulder block is suppressed to improve the durability. Further, the pneumatic tire according to claim 3 is the same as the above-described claim 1 or claim 2, in addition to the lateral grooves 28L, 28R, 29L, 2L of the intermediate block rows 24L, 24R.
9R and the lateral grooves 30L, 30R, 31L, 31R of the shoulder block row 27L, 27R
5L, 35R, 36L, 36R are formed in a wide water collecting portion, and extend in the longitudinal direction of the groove in a curved shape from the drainage inlet portion to the left and right outward. is there.

By adopting such a configuration,
While the tire is rotating (while the vehicle is running), the drainage through the lateral groove is improved. Furthermore, the pneumatic tire according to claim 4 has the protrusions 32L, 32R, 3 according to claim 1 in addition to the configuration according to any one of claims 1 to 3.
Each of 3L, 33R, 34L, and 34R is characterized in that it has a substantially mountain shape in which the leading side in the tire rotation direction F is steeply inclined and the trailing side is slightly inclined.

By adopting such a configuration,
Not only can air column resonance (noise) be reliably reduced, but also turbulent drainage due to the ridges 32L, 32R, 33L, 33R, 34L, 34R is prevented. Further, the pneumatic tire according to claim 5 has the protrusions 32L, 32R according to claim 1 in addition to the configuration according to any one of claims 1 to 4.
Are formed on the vertical ribs 21 and the protrusions 32L, 3
2R is the lateral groove 2 in the intermediate block rows 24L, 24R.
It is characterized in that it is arranged at a position substantially opposite to the drain inlets 35L, 35R of 9L, 29R.

By adopting such a configuration,
The drainage through the lateral grooves in the intermediate block row was improved. Furthermore, in the pneumatic tire according to claim 6, in addition to the configuration according to any one of claims 1 to 5, the protrusions 33L and 33R according to claim 1 form intermediate block rows 24L and 24R. Intermediate blocks 23L, 23R
Ridges 33L, 33R
Are characterized in that they are arranged at positions substantially facing the drainage inlets 36L, 36R of the lateral grooves 30L, 30R in the shoulder block rows 27L, 27R.

By adopting such a configuration,
The drainage through the lateral grooves in the shoulder block row was improved. The pneumatic tire according to claim 7 has, in addition to the configuration according to any one of claims 1 to 6, left and right intermediate block rows 24L and 24 according to claim 1.
Transverse grooves 28L, 28 forming one pitch P1 in the circumferential direction of R
The groove width of R is the width of the intermediate lateral grooves 29L, 29 within the one pitch P1.
The width of the lateral grooves 30L, 30R forming one pitch P2 in the circumferential direction of the left and right shoulder block rows 27L, 27R according to claim 1 is wider than the groove width of R.
The width is wider than the width of the intermediate lateral grooves 31L and 31R within one pitch P2.

By adopting such a configuration,
The middle block row and the shoulder block row ensure the grip performance, improve the dry grip performance, and ensure the steering stability, while ensuring the good drainage and the wet performance. Furthermore, the pneumatic tire according to claim 8 has the left and right shoulder block rows 2 according to claim 1 in addition to the configuration according to any one of claims 1 to 7.
Shoulder blocks 26L, 26 in 7L, 27R
The independent sipe 37L, 37R extending in the tread width direction is formed on the ground contact surface of R.

By adopting such a configuration,
The rigidity of the shoulder blocks on the inside and outside is reduced to prevent the pattern noise and road noise from increasing due to the vibration noise caused by the strength of the block rigidity, and the thin water film cutting effect by the sipes is secured. Since the sipes are closed (independent) instead of open, uneven wear and the like can be suppressed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. An embodiment with reference to FIG. 1 showing a part of a tread 20 in a pneumatic tire, more specifically, a pneumatic radial tire (flat tire) in plan view and FIG. 2 showing an enlarged view of FIG. 1. explain.

As shown in FIG. 1, at the center of the tread 20, a vertical rib 21 which is linearly continuous in the circumferential direction of the tire (indicated by an arrow F in the rotation direction of the tire) is provided so as to protrude. Outward and right sides of the tire 21 (inside and outside when the tire is mounted on the vehicle, the same applies hereinafter) outwardly through the left and right vertical main grooves 22L and 22R which are substantially linearly continuous in the tire circumferential direction. Block 23
L, 23R, left and right intermediate block rows 24
L and 24R are provided to protrude.

Shoulder blocks 26L, 26R are arranged in the tire circumferential direction on the left and right sides of the left and right intermediate block rows 24L, 24R via left and right vertical sub-grooves 25L, 25R which are substantially linearly continuous in the tire circumferential direction. The left and right shoulder block rows 27L and 27R thus configured are provided to protrude. The left and right intermediate block rows 23L, 23R are provided with horizontal grooves 28L, 28R, 29L, 2 at one pitch P1 in the circumferential direction.
9R, three blocks 23L, 23R are arranged in the circumferential direction. Further, the left and right shoulder block rows 26L, 26R have the same pitch as the one pitch P1 in the circumferential direction (only when completely equal to the pitch P1 in the circumferential direction). 1L in the circumferential direction that includes a lateral groove 30L,
Two shoulder blocks 26L, 26R are arranged in the circumferential direction via 30R, 31L, 31R, and the middle block rows 23L, 23R on the left and right and the shoulder block rows 26L, 26R on the left and right are denoted by the reference symbol T in the circumferential direction. A large number of blocks are arranged in the circumferential direction with the above-mentioned one pitch P1, P2 as a basic pitch, and the tread pattern is symmetrical with respect to the equator line of the tire based on the offset T. It has been.

When the tire is mounted on an automobile (passenger car, racing car, etc.) and running, the air in the air column formed between the vertical groove and the road surface at the tire ground contact surface causes the tire to rotate during tire rolling. An unpleasant 800H called air column resonance that resonates with the excitation force by the pattern and the input from the road surface
It is a main sound source of noise of z to 1 KHz. Therefore, in the present invention, the left and right vertical main grooves 22L, 22R and / or
Alternatively, protrusions 32L, 32 for reducing the width of the left and right vertical sub-grooves 25L, 25R to cut the wavelength of the air column resonance.
R, 33L, 33R, 34L, 34R may be any one of the vertical rib 21, the left and right intermediate blocks 23L, 23R, and the left and right shoulder blocks 26L, 26R (in the embodiment, the rib,
By forming them on both of the blocks at intervals in the circumferential direction of the tire, it is configured to suppress the base resonance sound (noise).

In the first embodiment shown in FIG.
Ridges 32L, 32R are formed on the left and right standing surfaces with a circumferential phase shift on the left and right at substantially the same pitch as one pitch P1, P2 at intervals in the circumferential direction. , 32R (the amount of protrusion in the tire axial direction)
The width of the left and right vertical main grooves 22L, 22R is reduced by the vertical direction, and the vertical surfaces facing (located) the vertical main grooves 22L, 22R of the left and right intermediate blocks 23L, 23R are provided with 1
By forming the protrusions 33L, 33R in one block 23L, 23R within the pitch P1, the vertical main grooves 22L, 22R are formed.
The width of the groove of R is reduced, and this intermediate block 23L, 2
The raised portions 33L and 33R in the 3R are arranged at substantially the center of the circumferential interval (length) of the raised portions 32L and 32R formed on the vertical rib 21.

Here, an unpleasant noise source is formed by forming at least one or more protruding portions 32L, 32R, 33L, 33R for cutting the wavelength of the air column resonance at the center contact portion of the tread 1. Is suppressed. In addition, since the columnar resonance sound is generated by the vertical sub-grooves 25L and 25R also in the right and left side contact portions of the tread 1, the outer sides of the intermediate blocks 23L and 23R facing (located) the vertical sub-grooves 25L and 25R. And vertical sub-grooves 25L, 2R inside each of the left and right shoulder blocks 26L, 26R.
Ridges 33L, 33R, 3 for reducing the groove width of 5R
4L and 34R are formed at intervals in the circumferential direction.

The left and right intermediate block rows 24L, 24R
Lateral grooves 28L, 28R, 29L, 29R and lateral grooves 30L of the left and right shoulder block rows 27L, 27R.
30R, 31L, and 31R have receding angles θ1, θ2, θ3, and θ4 with respect to the tire rotation direction F, and the lateral grooves 28L and 28R that constitute one pitch P1 of the left and right intermediate block rows 24L and 24R. The receding angles θ1 and θ1 are larger than the receding angles θ2 and θ2 of the intermediate lateral grooves 29L and 29R within one pitch P1, and the lateral grooves 3 forming one pitch P2 of the left and right shoulder block rows 27L and 27R.
The receding angles θ3 and θ3 of 0L and 30R are greater than the receding angles θ4 of the intermediate lateral grooves 31L and 31R within one pitch P2.

Specifically, the tire type 225 / 50R1
In 6, the angle θ1 is 76 °, the angle θ2 is 67 °, and the angle θ3 is 6 °.
4 ° and θ4 are 52 °. Here, the receding angle θ1
θ4 is as defined above, and its intersection angle (retreat angle) is θ1> θ2, θ3, provided that it is 90 ° or less.
> Θ4, the numerical value is not limited to the above-mentioned value, and in FIG. 1, the angles θ1 to θ4 are attached to the left side of the tread. Same as the left side.

Further, the left and right intermediate block rows 24L,
The lateral grooves 28L, 28R, 29L, 29R of the 24R and the lateral grooves 3 of the left and right shoulder block rows 27L, 27R.
0L, 30R, 31L, and 31R are drainage inlet portions 35L,
The grooves 35R, 36L, and 36R are formed in a water collecting portion having a wide groove width, and extend in the groove longitudinal direction in a curved shape from the drainage inlet portion toward the left and right sides (outward in the tire axial direction).

Here, when the tire rolls on the road surface,
The drainage flowing through the left and right vertical main grooves 22L, 22R is transferred to the horizontal grooves 28L, 2R in the left and right intermediate block rows 24L, 24R.
8R, 29L, and 29R are introduced into the water collecting portions 35L and 35R, and are drained to the left and right along the longitudinal direction of each lateral groove. This drainage is combined with the drainage flowing through the left and right vertical sub-grooves 25L and 25R while being merged. Shoulder block row 27L, 27R
Is introduced into the water collecting portions 36L, 36R of the lateral grooves 30L, 30R, 31L, 31R in the vertical direction, and flows down in the longitudinal direction of the grooves, thereby ensuring pattern noise (air column resonance sound) while securing hydroplaning performance. It is suppressed (reduced).

Further, the raised portions 32L, 32R formed on the left and right of the vertical rib 21 collect water in the lateral grooves 29R in the intermediate block row 24R, as illustrated on the right side in FIG. By disposing the drainage flowing in the vertical main groove 22 </ b> R further into the water collecting portion by being disposed at a position substantially opposed to the portion 35 </ b> R, the vertical rib 2
The ridges 32L, 32R formed on the left and right of 1 have the function of cutting the wavelength of the air column resonance (step) and the vertical main grooves 22L, 2L.
The drainage of the water flowing through the 2R is improved.

The left and right intermediate block rows 24L, 24
Ridges 33L, 33R formed on the outer side of R are also arranged at positions substantially facing water collecting portions 36L, 36R of lateral grooves 30L, 30R in left and right shoulder block rows 27L, 27R. Vertical main groove 22L, 2
The drainage of water from the 2R can be quickly drained in the left-right direction through the horizontal groove while being merged with the vertical sub-grooves 25L, 25R, whereby the ridges 33L, 33R have a wavelength cut function for air column resonance. It has a drainage promotion function.

Further, as shown in FIG. 2, each of the ridges 32L, 32R, 33L, 33R, 34L, 3
4R has a substantially mountain shape in which the leading side F1 in the tire rotation direction F is steeply inclined and the trailing side F2 is slightly inclined, so that the water collecting function of the leading side F1 is improved, On the side F2, the turbulent flow of water is prevented, and the drainage function is improved.

As shown in FIG. 1, the width of the lateral grooves 28L, 28R forming one pitch P1 in the circumferential direction of the left and right intermediate block rows 24L, 24R is equal to the pitch P1.
The width is wider than the width of the intermediate lateral grooves 29L and 29R, and the left and right shoulder block rows 27L and 27R
Grooves 30L, 30R forming one pitch P2 in the circumferential direction of
Of the intermediate lateral grooves 31L, 31R within the one pitch P2.
The groove width is wider than the groove width, so that three intermediate blocks and two shoulder blocks are arranged in one pitch, thereby ensuring a large steering angle cornering performance.

Further, the left and right shoulder block rows 27
Shoulder blocks 26L, 26R in L, 27R
Independent sipe 3 extending in the tread width direction
The formation of 7L and 37R prevents uneven wear while exerting a thin water film cutting effect by the sipe,
The durability has been improved. FIGS. 3 and 4 show the second and third embodiments of the tread pattern of the pneumatic tire according to the present invention, respectively. The basic structure and operation are the same as those of the first and second embodiments described above with reference to FIGS. Since this embodiment is the same as the embodiment, the same parts are denoted by the same reference numerals, and differences will be described below.

In the second embodiment shown in FIG. 3, the vertical ribs 21 at the center are not formed with left and right protruding portions, but are so-called straight ribs. However, the left and right intermediate blocks 23
Since the protrusions 33L and 33R are formed inside each of the L and 23R, the wavelength of the air column resonance sound in the left and right vertical main grooves 22L and 22R can be cut. In the third embodiment of FIG. 4, the left and right intermediate blocks 23L, 23R
The protrusions 33L, 33R formed inside the block are arranged in the middle in the block circumferential direction.

However, as shown in FIGS. 1 and 2, the protrusions 33L, 33R, 34L, 34R are formed at the ends in the circumferential direction of the block to improve the rigidity of the block and prevent abnormal uneven wear. Is advantageous. 1 and 2 (the same applies to FIGS. 3 and 4), the vertical main groove 22
When the groove depth of L, 22R is 100%, the vertical sub-groove 25
The groove depth of L and 25R is 90%, the lateral depth of the shoulder block row is 80%, and the horizontal groove of the intermediate block row is 50% on the main groove side and 80% on the sub-groove side.
The rigidity of the intermediate block is secured.

The above-described configuration is merely an example, and the following design changes are possible in the present invention. The vertical rib at the center of the tread may be zigzag in the circumferential direction. For the vertical rib at the center of the tread, a narrow groove is formed on this grounding surface to make two vertical ribs at the center.

Further, the number of independent sipes formed on the shoulder block may be two, and the shape may be a "H" shape or a waveform.

[0038]

As described in detail above, according to the present invention, it is possible to reduce the pattern noise while maintaining the hydroplaning performance, that is, improve the frequency dispersion and suppress the noise by reducing the air column resonance. Large steering angle cornering performance can be improved.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a pneumatic tire according to a first embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a partial plan view of a pneumatic tire according to a second embodiment.

FIG. 4 is a partial plan view of a pneumatic tire according to a third embodiment.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

 Reference Signs List 20 tread 21 vertical rib 22L, 22R vertical main groove 23L, 23R intermediate block 24L, 24R intermediate block row 25L, 25R vertical sub-groove 26L, 26R shoulder block 27L, 27R shoulder block row 32L, 32R Projection

Claims (8)

[Claims] 1. A longitudinal rib (21) continuous in the tire circumferential direction is provided at the center of the tread (20) so as to protrude, and left and right outer sides of the longitudinal rib (21) continuous in the tire circumferential direction are provided. Left and right intermediate block rows (24L) (24R), which are formed by arranging blocks (23L) (23R) in the tire circumferential direction through the vertical grooves (22L) (22R) of the left and right, and the left and right intermediate blocks are provided. Left and right vertical sub-grooves (25L) continuous in the tire circumferential direction on the left and right outer sides of the rows (24L) and (24R).
The left and right shoulder block rows (27L) and (27R), which are formed by arranging shoulder blocks (26L) and (26R) in the tire circumferential direction via the (25R), protrude, and the left and right intermediate block rows (24L) ( 24R) has a lateral groove (28L) (28R) at one pitch (P1) in the circumferential direction.
(29L) and (29R) via three blocks (23
L) and (23R) are arranged, and the left and right shoulder block rows (27L) and (27R) are provided with horizontal grooves (30L) at one pitch (P2) in the circumferential direction, which is equal to one pitch (P1) in the circumferential direction. Two shoulder blocks (26L) and (26R) are arranged via (30R) (31L) (31R), and the vertical rib (21) and the intermediate block (23L) (23)
R) and the shoulder blocks (26L) (26R) have the left and right vertical main grooves (22L) (22R).
Alternatively, the ridges (32) for cutting the wavelength of the air column resonance by narrowing the width of the left and right vertical sub-grooves (25L) (25R).
L) (32R) (33L) (33R) (34L) (34
R) is formed at intervals in the tire circumferential direction. 2. The intermediate block sequence (23L) (23)
R) lateral groove (28L) (28R) (29L) (29R)
And the shoulder block row (27L) (27R)
The lateral grooves (30L) (30R) (31L) (31R)
Sweep angle (θ1) (θ2) with respect to tire rotation direction (F)
(Θ3) (θ4), and the receding angle (θ1) of the lateral grooves (28L) (28R) constituting one pitch (P1) of the intermediate block row (24L) (24R) is one pitch (P1) The horizontal grooves (30L) (30R) which are larger than the receding angle (θ2) of the intermediate horizontal grooves (29L) (29R) and constitute one pitch (P2) of the shoulder block rows (27L) (27R). The pneumatic tire according to claim 1, wherein the receding angle (? 3) is larger than the receding angle (? 4) of the intermediate lateral grooves (31L) (31R) within one pitch (P2). 3. The intermediate block sequence (24L) (24
R) lateral groove (28L) (28R) (29L) (29R)
And the shoulder block row (27L) (27R)
The lateral grooves (30L) (30R) (31L) (31R)
Drainage inlet (35L) (35R) (36L) (36R)
The air according to claim 1, wherein the air collecting portion is formed in a water collecting portion having a wide groove width, and is extended in a longitudinal direction of the groove as a curved shape from the drainage inlet portion to the left and right outward. Containing tires. 4. The ridge (32L) (32) according to claim 1,
R, (33L), (33R), (34L), and (34R) each have a substantially mountain shape in which the leading side in the tire rotation direction (F) is steeply inclined and the trailing side is gently inclined. A pneumatic tire according to any one of claims 1 to 3. 5. The ridge (32L) (32) according to claim 1,
R) are formed on the vertical ribs (21), and the ridges (32L) and (32R) are formed in the intermediate block row (24L).
The pneumatic tire according to any one of claims 1 to 4, wherein the pneumatic tire is disposed at a position substantially opposite to the drainage inlet portions (35L) (35R) of the lateral grooves (29L) (29R) in the (24R). . 6. The ridge (33L) (33) according to claim 1,
R) are formed outside the intermediate blocks (23L) and (23R) constituting the intermediate block rows (24L) and (24R), and the ridges (33L) and (33R) are formed of the shoulder block rows (27L). ) (27R)
The pneumatic tire according to any one of claims 1 to 5, wherein the pneumatic tire is disposed at a position substantially opposite to the drainage inlet portions (L) and (R) of the (L) (30R). 7. The lateral groove (28L) (28R) constituting one circumferential pitch (P1) of the left and right intermediate block rows (24L) (24R) according to claim 1 has a width of the one pitch (P1). ) Are wider than the groove widths of the intermediate lateral grooves (29L) (29R), and further constitute one circumferential pitch (P2) of the left and right shoulder block rows (27L) (27R) according to claim 1. The widths of the lateral grooves (30L) and (30R) are the same as those of the intermediate lateral grooves (31L) (31) within the one pitch (P2).
The pneumatic tire according to any one of claims 1 to 6, wherein the width is wider than the groove width of (R). 8. The independent sipe (37L) (37R) extending in the tread width direction is provided on the contact surface of the shoulder block (26L) (26R) in the left and right shoulder block rows (27L) (27R) according to claim 1. The pneumatic tire according to any one of claims 1 to 7, wherein