SA111320672B1 - Pneumatic tire - Google Patents

Abstract

The present invention relates to a pneumatic tire which achieves both drainage property and traction performance. The ground portion (5) of the ground contact surface (1) of the tread portion is provided with plural combined grooves (7) of zigzag shape, to divide the ground portion (5) into plural second blocks. combined grooves (7): first groove portion (7a) extending obliquely with respect to the tread circumferential direction from the first circumferential groove (2) at a relatively small angle, one end of the groove portion The first groove portion, provided that the first circumferential groove (2) opens, the other end of the first groove portion ending within the ground part, and the second groove portion (7b) extending obliquely with respect to the tread circumferential direction of the tread circumferential direction in the same direction as the groove part The first (7a) at a relatively small angle, and one end of the second groove part, provided that it is placed within the second land portion, and the other end of the second groove part, provided that it opens to the second circumferential groove 3, and the third groove part 7c that extends obliquely with respect to the circumferential direction of the surface The car wheel at a relatively large angle and connected with the other end of the first groove part (7a) and one end of the second groove part (7b)

Description

Y

The tire is filled with compressed air

Pneumatic tire Full description Lita The invention The present invention is concerned with the pneumatic tire, and in particular it means for the purpose of the technology of achieving the well-improved drainage property in well-coordinated traction performance and co-ordinated manner © dle in general; In order to improve the discharge property; The conventional pneumatic tire uses the tread pattern determined by integrating the circumferential groove extending along a circumferential direction of the tread circumferential direction close to the equatorial plane of the tire tire equatorial plane with collective acutely angled grooves (so-called high angle grooves) extending obliquely with respect to the circumferential direction of the wheel surface at a relatively small angle angle, as described for example in patent document No. 1. However, in this frame, blocks Ul dire are defined by a circumferential groove 00, and the grooves with an acute angle have a narrow and elongated shape. The rigidity of the molds decreases and there is a room for additional improvement by means of frictional efficiency (performance efficiency 4x ill p. 171: L). The car wheel determined by merging the circumferential groove extending along the circumferential direction of the surface of the car wheel close to 0 equatorial plane of the tire with obtusely angled grooves collective sala v relative to the direction Lad extended obliquely (low angled groove (The so-called low-angle groove is described as a crelatively large angle circumferential surface of a car wheel at a relatively large angle, however; In this context; The LY chamber, for example, is found in Patent Document No. -drainage property for additional improvement by means of the vacuum property.

0 As described lil with traditional Abed pneumatic tires it is considered difficult to simultaneously achieve both the drainage and the adhesion efficiency of the tire at a high level. Japanese Patent Open Thread No. 7006 = 131470. Japanese Patent Open Topic No. 70001-16706.

0 GENERAL DESCRIPTION OF THE INVENTION The object of the present invention is to provide a pneumatically filled tire that achieves both the vacuum property and the adhesion efficiency at a high level. The pneumatic tire, according to the present invention, has a ground contact surface for the ctread portion and the first circumferential groove.

Circumferential groove 0 placed at the equatorial plane of a tire or within Yo % of the tread width measured from the equatorial plane of the tire and extending along the circumferential direction of the surface of the car wheel ¢ and the second circumferential groove placed between The first circumferential groove and the end of the tread end Bled!, which extends along the circumferential direction of the surface of the wheel of the car, and thus sia defines the land portion between the circumferential groove

© _ the first and the second circumferential groove in which the ground part is supplied with plural combined grooves of zigzag shape p2:8788; For sectioning the ground part into collective molds Gua 010:81 blocks include the aforementioned combined grooves: Part of the first groove extending diagonally with respect to the circumferential direction of the car wheel surface from

¢ the first circumferential groove at a relatively small angle; One end of the first groove part opening to the first circumferential groove and the other end of the first groove part ending within the aforementioned ground part + and the second groove part extending obliquely with respect to the circumferential direction of the car wheel surface in the same direction as the first groove part at a relatively small angle; And one end of the second groove iad 0 provided that it is placed within the aforementioned ground part and the other end of the second groove part provided that it opens to the second circumferential groove and the third groove portion that extends obliquely with respect to the circumferential direction of the surface of the car wheel at Relatively large angle and connected with the other end of the first groove part and one end of the second groove part. According to the present invention; It is only necessary that each of the circumferential grooves (0 Joby Sed) have the circumferential direction of the surface of the car wheel and in addition to the straight shape the circumferential grooves may extend as main grooves with zigzag shape ¢ wave shape ewavy shape curved shape ¢ cranked shape or other shapes. Each of the angles was measured in the case where the tire is combined with the rim specified in the 10 industrial standards affecting the areas where the tire is made or used and inflated at a maximum air-filled pressure. And these industrial standards should be specified, for example, in the book of the year JATMA (Japan Automobile Tire Manufacturers Association in Japan) ETRTO (Technical Regulation for the European Tire and Rib) Rim Technical Organization for Standards Manual 0 in Europe and the Yearbook (The Tire and Rim Association Inc. in the United States of America. In the tire as previously described » it is from DES is defined as the first groove part and the second groove part inclined at an angle in the range of 0 - 10° with respect to the circumferential direction of the wheel surface.

° car and 5a the third groove is inclined at an angle in the range of 0° - 90° with respect to the circumferential direction of the car's wheel surface. Also, it is preferable that the difference between the inclination angle of the first groove part and the second groove part and the third groove ea inclination angle is more than or equal to 11 degrees. © So far Lad it is preferable that the distance between the gia of the other end of the first groove part and the groove wall of the second circumferential groove is in the direction of the width of the wheel surface of the car in the range of Bo 00 - 01 from the width of the ground part the second . even now; It is better atl provides the inclination of the chamfered portion towards the groove bottom of the first groove part on the upper end portion 0 of the side wall of the block facing the wall The groove wall of the equatorial plane side of the tire equatorial plane side is provided on the part of the upper end of the side wall of the mold facing the groove wall on the equatorial plane side of the tire of the first groove part. So far too ¢ it is better to provide the chamfered part sloping towards the bottom of the groove of the second groove part on the part of the upper end of the side wall of the template facing the groove wall on the end side 1 of the tread end side of the second groove part. Chamfers may be a flat-like shape or a Jie-curved-surface-like shape so far as well; It is better that the groove depth of the third groove part is formed from the ground contact surface of the cus tread ground contact surface Ye is shallower than the average groove depth of the first groove part and eda of the second groove measured from the contact surface flattened to the surface of the car wheel.

so far Lad; It is better that it provides there the sipe that opens to the part of the first groove and the gla of the second groove adjacent to each other in the direction of Jama for the surface of the wheel of the car for the ground part. According to the tire filled with compressed air according to the present invention; sin provides the ground with what is called collective compact grooves of zigzag shape and includes eda the first groove extended badly with respect to a circumferential direction of the surface of the car wheel from the first circumferential groove at a relatively small angle 5 one end of the first groove part provided that it opens For the first circumferential groove and the other end of the part of the first groove ending within ela the ground and the part of the second groove extending with a deviation Lag is related to the circumferential direction of the surface of the car wheel in the same direction as the part of the first groove at a relatively small angle; 0 and one end of the second groove part provided that it is placed within the ground call and the other end of the second groove part that opens to the second circumferential groove; And the part of the third groove extending at a deviation with respect to the circumferential direction of the surface of the car wheel at a relatively large angle and connected to the other end of the first groove part and this end to the second groove part. With this combination; It is possible to improve the unloading property with the first groove part and the second low angle groove part 1 with respect to the circumferential direction of the car wheel surface and in addition to the unloading property and adhesion efficiency improvement with the third high angle groove gia Relates to the circumferential direction of the car's wheel surface ¢ as it is possible to simultaneously achieve both the discharge property and the adhesion efficiency with this type of second ground eal. A brief explanation of the drawings » Figure No. 1 (a) is a partial advanced view of the model of the surface of the car wheel, showing the representation of the tire filled with compressed air according to the invention, Jal, and the figures Nos. 1 (b) to 1 (e) are a Magnified sectional views taken respectively along lines b–b; C - C D - D and E - E According to Figure 1 (a) 0:

Figure No.? (a) A partial evolved view of the tire surface model showing this example of a conventional pneumatic tire; Figure 1 (b) is a partially developed view of the car wheel surface model showing the other example of a conventional pneumatic tire.

© Best Pattern to make the invention here then; The pneumatic tire according to the present invention will be described in detail with reference to the drawings. Laie The installation structure to strengthen the reinforcing within the frame is similar to that of the general radial tire or the biased tire cbiastire omit the clarification in the drawings.

entire ground contact surface In the drawings, the entire ground contact surface 1 is the reference number 0 of the part of the wheel surface; 2 grooves 1 for the surface part of the car wheel. On the surface of the contact with the ground located on both sides of the level 1 two first circumferential grooves two first equatorial circumferences of the tire and extending along the circumferential direction of the surface of the wheel surface of the car are provided at positions within the width of the surface of the wheel of the car measured from the surface of 96 To In graphics and at 96 To

0 equatorial tyre and second circumferential furrows? Extending along the circumferential direction of the surface of the car wheel, it provides between the ends of the surface of the car wheel the reflective tread ends of Cua adjoining the side portions of the reflective first circumferential 1 grooves. It should be noted that despite what is in the fees; Two primary grooves are placed close to the plane

0 equatorial tire; And it is possible to place one circumferential groove first at the equatorial plane of the frame. ela consists of the first land portion ; Between two surrounding grooves adjacent to each other in the drawings between two initial station grooves ¥; second land portion

A

F 1 is formed between the first circumferential groove (1) the land part according to protection element No. (© between the third land portion CGH La NV) and the YF part forms the second circumferential groove. for the vehicle's wheel surface the second circumferential side edge * and the side edge extended in the rib-like land portion ein; It is a JN part of the ground that does not provide the groove in the drawings. With the ground part Led the circumferential direction of the surface of the car wheel; which © is like a rib; The stiffness of the tire increases close to the equatorial plane of the tire; It is possible to improve the steering stability of the Extended IV in a pneumatic tire; The second ground part has the first groove part at 1 with respect to the circumferential direction of the wheel surface from the first circumferential groove preferably in the range of 0 - £10 degrees and terminated within the chigh angle part of 0 Relative to the circumferential direction of the surface of Lad Earth II © and the part of the second groove 1b extending obliquely from the second circumferential groove? At the angle IV the wheel of the car is in the same direction as part of the first groove er high and preferably in the range of 0 - £ 10 degrees and ends within the part of the second ground © and the part of the second groove ab and extends IV the third groove AG connected with the first groove part deflected with respect to the circumferential direction of the wheel surface at a low angle, preferably in 0 . Zigzag shape 17 degrees. with these grooves; The zigzag groove £0 - 1 bezel consists of oA many second blocks 7 zigzag grooves many zigzag grooves form in the 4 second sipe it is better that it supplies the second sip ¢ A second block in The second template graphics at a high angle; and preferably in the range from -£0° to +0° with respect to°V +° to -V in the direction of the width of the wheel tread and at an angle in the range of 0 or the second groove part ab; The sip IV should open the first groove, gad, related to the normal line 1 of the zigzag groove 7, and the part of the second groove of the second groove of the zigzag TV, second 9, of the first groove part. in the circumferential direction of the TV wheel surface adjacent to the first groove part q with the second sip 4; The second part of the earth © may easily be distorted; Steering stability deteriorates and excess twisting da partial wear resistance . The second ground © can be lowered when the frame is rotated and steered manually 0 May determine the groove width of the first circumferential groove? And the second circumferential groove? In the range of who may specify 1 mm; And the groove depth of the first circumferential groove? and the second circumferential groove YO -

Vo - 1 Specifies in the range from BY in the range of 0 - 10 mm. And the width of the groove for the groove of the meander. mm 01 - determined in a range of ? BY mm and the depth of the groove for the zig zag groove gradually towards the bottom of the first chamfered 01 gall; A decreases in the vicinity of the center of the second template, providing the planar state; For example, in the case of level IV the groove of the first groove part, the upper end of the side wall of the second mold / facing the groove wall on the level wall 0 formed corner portion; And in the drawings at the corner part IV equatorial of a frame for the first groove part second and the second chamfered part ZV and the third groove part IV the first groove gia by; On the QV it gradually decreases towards the bottom of the groove for the part of the second groove 11 chamfered portion facing A for example in the level condition provided on the upper end of the side wall of the second mold the second groove / ab 6 in ial to the wall of the groove on the side The end surface of the ve wheel is angled, formed by the second groove part ab and the third groove part lag; The edad extends the drawings at, for example, the length of the first chamfered portion 01 first chamfered portion. The length of the second groove part AB 11 and the second chamfered part extends TV 11 third chamfered portion; The third chamfered part, A, decreases in the second die, Lad angle formed, ed” is provided in the arcuate manner gradually, for example, in the arcuate manner, 0 ed and 1 by means of the first circumferential groove? And the part of the first groove AA for the zig zag groove gradually decreases, for example in the style VY fourth chamfered portion The fourth chamfered angle formed by the second circumferential groove? And the part of the second groove, the arched eda, is provided at

Ve

Lap for the zig zag groove 17 . With this configuration at the corner positions adjacent to a part

The first groove TV is high angle and the second groove part is AB; feature can be obtained

excellent discharge; Partial wear is most likely to occur. In this regard ;

by making the extended length of the third chamfered segment 11 longer than that of a fourth chamfered segment 17 in order to improve 0 the rigidity of the ground segment; It is possible to achieve both a reduction in partial friction and an improvement in

discharge feature.

When the zig zag groove opens ' of the first circumferential groove 7 and the second circumferential groove 1; maybe

Water discharges smoothly mainly from the first circumferential groove 7 to the second circumferential groove ?

At the period of time when the frame rotates and by the synergistic effect to determine the rotational direction 0 of the frame.

in the third land part 6; 11 plural third blocks are formed with grooves

Lateral VE 180:81 grooves that cross ein the third floor + and extend obliquely in the direction of

The surface width of the car wheel, tread width direction, and opens to the second circumferential groove? And

The lateral edge of the car's wheel surface has an increased groove width than the second circumferential groove? 0 towards the side edge of the car's wheel tread in Jie funnel-like form .

Also » the third sip provides the 11 third open sipe to the second circumferential groove? and Edge

The side surface of the car wheel close to the center of the third block 11 third block in the direction

circumference of the wheel surface.

also ; In the third template, Yo ¢, the fifth chamfered part, VV fifth chamfered portion, Ye, decreases gradually 6, for example, in the flat ALY, it is provided at a part with an angle formed by the groove

Surround II? And the lateral groove is 104 lateral groove.

in the frame as previously described; It is much better in the angle of inclination » for the first groove part a f

oa the second groove ab of the zig zag groove 7 with respect to the circumferential direction of the surface dae of the car

11 Determine in the range of 0 - 10 degrees as it is possible to significantly improve the vacuum property. Specifically in the circumferential direction of the surface of the car wheel from the difference in angel if the angle exceeds » £0 degrees » the difference in angle is Ala in ; As it is of 17 zigzag groove part of the third groove 1c is not enough to be a difficult zigzag groove in order to effectively achieve both the unloading property and the cohesive friction efficiency. in terms of degree; The shape of the mold for the second mold is long V0 for the other; If the angle is less than . Unnecessary and narrow and where the mold stiffness tends to be low is preferable; Determine the angle of inclination 8 of the third groove segment 7c with respect to the circumferential direction of the surface of the car wheel in the range of 0° - 96°; As it is possible to increase gripping forces, and in particular to improve ground surface effectively with gripping force 0. Friction efficiency in case the angle exceeds 960 degrees; The distance between the first groove part A! and the dish© part of the second groove A placed in the second ground part is likely to be less than £0 degrees; Figure Alls Discharge property degradation . from the other side ; At the acute angle of the molds adjacent to the parts, where the third groove part lag connects with the groove part 0 first a and the third groove part 1c connects with the second groove part AB is abnormally long. It is required and tight, and where the stiffness of the molds tends to be low, and the fourth groove part is much better ¢ The difference between the inclination angle of the first groove part is determined. degree or more Vo II "b" and the angle of inclination m for the third groove part C in order to equal with this composition ¢ it is possible to suppress the decrease in the stiffness of the moldings adjacent to the close Ye and the third groove part IV parts where The part of the third groove / A is connected with the part of the first groove

B is much better; sets the distance; In the direction of the width of the surface of the car wheel between the second circumferential groove 0” and the outermost position eal the first groove IV of the zig zag groove 17 in the direction of the width of the surface of the car wheel in a range of 01 - 30 96 from the width of the ground for part the second ground; Since it is possible to improve the discharge property even in Alla, that the first groove part IV of the zigzag groove © 7 does not open directly from the first circumferential groove? To the second circumferential groove? . Provided that the first beveled part 01 and the second beveled part 11 be supplied in the second mould; It is possible to effectively empty the water without trapping the stones in the gully; Even if the stones enter along the length of the zigzag groove 1, as it is possible to improve the stone-trapping resistance z 0, the depth of the groove for the third groove part is 7 c measured from the ground contact surface to the dae surface The vehicle is shallower than the average average groove depth of groove part A and groove part B measured from the vehicle wheel surface contact surface; And who is better in whose range? -; mm and preferably in the range of Yo = 56 00 from the groove depth of the first groove part a and the second groove part ab measured from the ground contact surface of the car wheel surface. VO with this combination; Unequal forces are used for the template part extending over the first groove part A and the second groove part / ab with an acute angle in the zigzag groove 17; And sy the first groove A and the part of the second groove A come close to each other precisely when a slip angle of the frame occurs, as it is possible to reduce the adverse effect of the discharge. drainage 790 example after that; Simple frames have been prepared, including the frames of Example No. 1 and ? ; Which are pneumatic tires of size 71# PSR / 45817 and the tread pattern of the car as shown in Figure 1; Comparative tire 1 has a surface model

YY

The car wheel in which grooves are provided with an acute angle, YY, to the second ground part, as shown in Figure 1 (a); And the comparative frame (1) with the car wheel surface model in which the obtuse-angle grooves YY obtuse-angle groove are provided to the second ground part as shown in Figure No.? (B) . Table 1 presents the inclination angles of the grooves with respect to circumferential direction 0 of the tire; And the distances + in the direction of latitude for the frame of the surface of the sland wheel, which extends along the lengths of the chamfered portions and the depths of the third groove. It should be noted that the other combinations of the comparison examples Nos. 1 and 7 are placed in accordance with the frameworks of the example. Table No. 1 nana] No. 1 No. 1 Comparative No. 1 | Comparator No. 1 a 1] es) car wheel (mm con 79 YY | Extending shall length of the first chamfered part (mm) 1] ees the second (mm) Extended length of the chamfered part 15|4 rd ( mm )

0

1 1 fourth ( mm )

1 a ) v ) mm

1 es (first) mm

7 ee (second) mm

Groove depth of the groove part | LY LY

III (mm)

For the previously described prepared tires; An evaluation has been performed on the discharge property; Efficiency of adhesion friction and stone grip resistance.

(discharge feature)

The example frames and the comparison frames 1 and * are grouped together with the side having size VY in g eh

© And inflated when filled with air pressure of 7701 tire pneumatic pressure kilopascal, and then installed in a vehicle that carries two people. for tires; The braking distance was measured at the time of full braking from an initial speed of 01 km / h on the surface of the earth made of a solid steel plate with a water depth of Y water. depth mm; And on the basis of the measured braking distance and the characteristic 0 of the discharge for each of the tires, an evaluation of 0 was evaluated. The evaluation results are presented in Table 1.

It should be noted that the figures are in Table No. ? af is an index values obtained by setting the value of comparison example frame 1 to equal 001 . Larger index values represent a better unloading property.

Vo) (adhesive friction efficiency in inches and 17 and * with a rib of size 1. Both the example tires and the comparison tires No. kPa were assembled and then installed on the 1701 car inflated at the pressure of the tire By air for a tire oA test In the direction of the test, feeling evaluation, which carries two people, for tires, the feeling evaluation was performed under the asphalt test course modes at a period of time to move on a test run on the asphalt driver © and on the basis of the evaluation of the feeling and Friction efficiency Various traveling modes Various transmission Adhesion for each of the tires has been evaluated The evaluation results are shown in Table No. Friction .001 to equal 1 by putting the value of the comparison example tire No. . better adhesion 0) stone grip resistance (inches, 17 and 7 with the rib size 1) Both tires were assembled Example and comparison tires No. kPa, and then installed on the car 1701H and inflated at the pressure of the tire full of air for a tire of kg / hour; and 0-001 km at a speed of 00001 that carries two people. After the car traveled a distance in the second part of the ground, the number of stones was calculated for each of the tires, the number of stones caught, Vo . 1 for an indicator and its evaluation has been completed. The results of the evaluation are presented in Table No. Ble in order for the indicator obtained to be marked by putting af. It should be noted that the figures are in Table No. ? It is the smallest index values representing the rate of holding stones. 001 so that 1 equals the value of comparison example frame no. The smallest and the best resistance to holding stones 1 Table No. 0 Example frame number 1 Example frame JE Comparative frame No. ? | ay Comparative 1 1 Example No

unless

YL Yo Yo 1111 Frictional adhesion efficiency according to Table No. 7; The example tires show excellent adhesion efficiency and stone gripping resistance compared to the comparison example tire 1 . also ; Although only one end of the jad groove is high angle to the zig zag groove opening to the circumferential groove; And it is possible for the example frames to have an unloading property similar to the comparison example frame 1 . also ; Although the frictional and adhesion efficiency is similar between the example tires and the comparison example tire? ¢ The example tires show excellent gripping resistance and treading properties when compared to Comparison Example 7. Reference figures are shown in C.A.

for wd] = api i ea

Claims (1)

YA protective elements including ground contact pneumatic tire - 1 1 and ctread portion of ground contact surface Y tire equatorial positioned close to the equatorial plane of the tire first circumferential groove 1 read circumferential direction and extending along the circumferential direction of the surface of the car wheel plane ¢ the position between the second circumferential groove and the second circumferential groove ° extending along the tread end of the surface of the car wheel first circumferential The first groove 1 sin, thus known as the tread circumferential direction for the circumferential direction of the car wheel surface and the first circumferential grooves between the first circumferential groove, the land portion, the land, A land portion, provided that the ground part is provided second circumferential grooves 4 with zigzag shape plural combined grooves aforementioned with combined grooves 1 where plural blocks into collective molds land portion ail »18288-68 11 aforementioned : combined grooves VY combined grooves extending obliquely with respect to circumferential direction first groove portion - VY first of tread circumferential direction of Ve first groove at an initial angle; One end of the circumferential groove (Yo JAY) and the end (5:5) circumferential groove to open for the first circumferential groove Je portion 5 previous land portion ending within the ground part first groove portion for the first groove portion The male; YA relates to the direction of the lad extended with the deviation of the second groove portion - 4 in the same direction as the tread circumferential direction of the wheel surface Ye second and one end of the second groove portion Auli at the corner of the first groove portion of the aforementioned 711 and the other end of the land portion of Land 1, provided that it is placed within the groove portion YY A for the second groove portion to open to the second circumferential groove Y¢ and Yo - the third groove portion extending diagonally with respect to v1 circumferential direction of the wheel surface tread circumferential direction at a third angle and connected with vy the other end of the first groove part 5:56 groove portion and one end of the second groove part .second groove portion YA 1 " - the pneumatic tire according to Claim No. 1 Y, where the aforementioned closeup includes an equatorial plane of the tire equatorial plane, suitable position 1 within TO % To display the car's tread width on both sides of an equatorial plane ¢ of a tire equatorial plane as measured here. Where the first and second angles are at an angle from £0 - 90 degrees with respect to the circumferential direction 1 of the car's wheel surface. where the third angle is in the range of £0 - 90° with respect to the direction of © - 1 protection from - tread circumferential direction dae the vehicle circumferential surface yv —o 1 pneumatic tire tire according to any one of the elements of Y protection number 1 - 4 ; Where at least the difference between the first and second angle from v the third angle is not less than 10 degrees. 1 1 - The pneumatic tire according to any one of the Y elements, protection number 1 - ©; Where the ea first groove portion has two ends end position 1 which diverges in the tread width direction from 1 by second circumferential groove groove wall -second land portion of the width of the second circumferential groove 96 70 - 01 which is in the range of ° according to any one of the pneumatic elements tire pneumatic tire - 1 1 side wall second block; Where the second template has + - 1 protection number Y tire equatorial plane for the groove wall side equatorial plane 1 upper end portion cia and first groove portion for the first groove part side ¢ aforementioned to be provided with the aforementioned block part of the mold side wall ° for the groove bottom part chamfered part 1 first groove portion for According to which one of the elements of the pneumatic tire - A - 1 facing the side wall (ils aforementioned block wall; where the mold + - 1 has protection from the Y number of the tread part end side groove wall 1 upper end portion 880000; groove wall ¢ chamfered portion with chamfered portion block For the template side wall ° .second groove portion For the second groove portion groove bottom The slope towards the bottom of the groove 1 according to any one of the elements of the pneumatic tire The pneumatic tire - 4 1 Groove depth third groove portion; Where the third groove part A - 1 has protection from the number Y tread ground as measured from the groove depth ¥ third of the car wheel surface for the third groove depth that the depth of the groove is Je contact surface ¢ For average groove depth groove portion ° as measured from the first and second groove portions 1 tread ground contact surface of the car wheel surface AA 0 1 - pneumatic tire according to ALS of Y Claims No. 1 - 5; Where the land portion is supplied with the sipe that 3 opens to the first groove portion and the second groove portion ¢ adjacent to each other in a circumferential tread circumferential -direction °