WO2008015904A1 - Pneumatique - Google Patents
Pneumatique Download PDFInfo
- Publication number
- WO2008015904A1 WO2008015904A1 PCT/JP2007/064081 JP2007064081W WO2008015904A1 WO 2008015904 A1 WO2008015904 A1 WO 2008015904A1 JP 2007064081 W JP2007064081 W JP 2007064081W WO 2008015904 A1 WO2008015904 A1 WO 2008015904A1
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- WO
- WIPO (PCT)
- Prior art keywords
- block
- tire
- pneumatic tire
- notch
- groove
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1392—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block edges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
- B60C2011/133—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising recesses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/14—Tyres specially adapted for particular applications for off-road use
Definitions
- the present invention relates to a pneumatic tire in which a tread pattern having a plurality of block forces is formed in a tread portion, and in particular, a notch portion is formed in a block to improve off-road performance, performance on snow, cornering performance, and the like.
- the present invention relates to an improved pneumatic tire such as a tire for a four-wheel drive vehicle.
- a pneumatic tire increases the coefficient of friction between the tire and the road surface in the tread portion to ensure effective driving / braking performance and driving stability, or improves drainage performance to improve wet performance.
- various grooves, sipes, and the like are formed.
- a block pattern in which a plurality of blocks are formed by partitioning a plurality of main grooves extending in the tire circumferential direction and a plurality of lug grooves extending across the main grooves. It is known (see Patent Document 1).
- FIG. 4 is a plan view showing an example of a tread pattern of such a conventional pneumatic tire, which is not described in the patent literature.
- This pneumatic tire 100 has a tread pattern 110 that is point-symmetric with respect to a point on the tire equatorial plane CL. As shown in the drawing, the tire 100 is arranged around the tire equatorial plane CL across the tire equatorial plane CL. Tires 111 and two main grooves 112 extending in a zigzag manner in the tire circumferential direction and disposed between the main grooves 111 and the tread ends TE. A plurality of (5 in the figure) land portion rows 113 extending in the circumferential direction are formed.
- each of the land rows 113 is partitioned into a plurality of blocks 115 by the lug grooves 114. is doing.
- a plurality of sipes 116 are formed in each block 115, and one or two sipes 116 are formed on the edge of each block 115 facing the main groove 111, 112 or lug groove 114, respectively.
- a notch 117 is formed.
- the notch portion refers to the edge force of the block and cut into a predetermined shape toward the inside of the block. It is a cut-in part that is cut, with one end opening into each groove and the other end ending inside the block, a recess made locally at the edge of the block.
- the notch 117 is formed in the block 115, and the edge component of the block 115 that exhibits the edge effect is increased to increase the trough performance and braking performance of the pneumatic tire 100. To improve snow performance and off-road performance.
- the notch 117 has a notch 117, and the surface force of the notch 117 is also linearly cut inward in the tire radial direction to the vicinity of the groove bottom of each groove 111, 112, 114.
- the force is formed at substantially the same depth as the grooves 111, 112, and 114, or it is raised slightly from the bottom of the groove by about 1 to 2 mm and formed slightly shallow. Therefore, in this conventional pneumatic tire 100, the rigidity of the block 115 may be reduced, which may affect other tire performances.
- this notch 117 is effective in improving the traction performance and braking performance during running on snow by securing an edge component in the front-rear direction (tire circumferential direction). There is a problem that the effect on the improvement of cornering performance (handling performance, skidding resistance, etc.) due to an increase in edge component is not sufficient.
- Patent Document 1 Japanese Patent Laid-Open No. 5-229310 Disclosure of the invention
- the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to ensure cornering on each road surface while ensuring traction performance and braking performance on a snow or off road of a pneumatic tire. It is to improve the performance, improve off-road performance and on-snow performance, and improve steering stability.
- the tread portion has a plurality of land portion rows formed by a plurality of main grooves extending in the tire circumferential direction, and the land portion rows extend in a direction intersecting the main grooves.
- a pneumatic tire partitioned into a plurality of blocks by a plurality of lug grooves, wherein at least one row of the blocks in the land portion row has an edge force of the block cut into the block.
- a surface force in the block is provided with an inclined surface in which a stepping step is formed in the groove bottom direction on the edge side of the block.
- the stepped portion of the inclined surface is formed in a step shape having a plurality of concave curved surfaces and a ridge force provided between the concave curved surfaces. It is characterized by.
- the ridge is mainly composed of an upper surface portion parallel to the tire width direction and a side surface portion mainly parallel to the tire radial direction.
- the angle on the leading end side of the strip is formed between 80 degrees and 120 degrees!
- the invention according to claim 4 is the pneumatic tire according to claim 2 or 3, characterized in that the inclined slope has at least two ridges.
- the invention according to claim 5 is the pneumatic tire according to any one of claims 1 to 4, wherein the shoulder is disposed between the tread end of the tread portion and the main groove on the outermost side in the tire width direction.
- the main groove side force has the trapezoidal block in a plan view whose width gradually decreases as the force toward the tread end side is applied, and the trapezoidal block has the block on the main groove side edge. It has a notch part.
- the notch portion has an edge force of the block that gradually increases in width toward the block. It is formed in a trapezoidal shape that reduces in plan view.
- notch portions are provided in at least one block of the land portion row formed in the tread portion of the pneumatic tire to increase the edge component of the block exhibiting the edge effect.
- an inclined surface is formed in the notch where the surface force of the block is directed toward the groove bottom, and the block rigidity is ensured by suppressing a decrease in the rigidity of the block due to the provision of the notch.
- the edge effect is exhibited in the notch.
- the cornering performance on each road surface can be improved while ensuring the traction performance and the brake performance on the snow and off road of the pneumatic tire, and the off road performance and the snow performance are improved.
- the steering stability can be improved.
- FIG. 1 is a plan view showing a developed tread pattern formed on a tread portion of a pneumatic tire of the present embodiment.
- FIG. 2 is an enlarged plan view showing a portion X in FIG.
- FIG. 3 is a cross-sectional view taken along the line FF in FIG.
- FIG. 4 is a plan view showing a developed example of a tread pattern of a conventional pneumatic tire. Explanation of symbols
- the pneumatic tire of the present embodiment is a pneumatic tire used for, for example, a four-wheel drive vehicle, and includes a pair of bead cores disposed in a tire bead portion and at least one carcass extending in a toroidal shape therebetween.
- Carcass layer and tread force It has a known pneumatic tire structure such as a belt layer and a tread arranged on the outer peripheral side of the single layer.
- FIG. 1 is a plan view showing a developed tread pattern 10 formed on the tread portion 2 of the pneumatic tire 1 of the present embodiment.
- the pneumatic tire 1 has a tread pattern 10 that is point-symmetric with respect to a point on the tire equatorial plane CL, and as shown in the drawing, a plurality of (here, two) main grooves 11 that extend in the tire circumferential direction, And a plurality of lug grooves 21 to 26 extending in a direction crossing the groove 11. Further, in this pneumatic tire 1, a plurality of (three in this case) land portion rows 30 and 31 extending in the tire circumferential direction formed by partitioning each main groove 11 and the tread end TE are formed in the tread portion 2. In addition, each of the land rows 30 and 31 is divided by a plurality of lug grooves 21 to 26 and divided into a plurality of blocks 30B and 31B.
- the two main grooves 11 are formed in two groove widths, a narrow width portion and a wide width portion, by changing the groove wall position on the inner side in the tire width direction, and the tire equatorial plane CL It is placed between the tread ends TE across As a result, both outermost sides in the tire width direction between the wide central land portion row 30 located on the tire equatorial plane CL partitioned by both main grooves 11 and the tread edge TE partitioned by the main groove 11 ( (Shoulder side)
- the shoulder land row 31 is located at the bottom.
- the lug grooves 21 to 26 are connected to the first to fifth lug grooves 21 to 25 formed in the central land section row 30 and the shoulder lug grooves 26 formed across the shoulder land section row 31 and the force. And are arranged at predetermined intervals in the tire circumferential direction.
- the first to fifth lug grooves 21 to 25 are point-symmetric with respect to points on the tire equatorial plane CL, and the first to fourth lug grooves provided on both sides of the tire equatorial plane CL. 21 to 24 are inclined at a predetermined angle in the opposite direction to the tire circumferential direction across the tire equatorial plane CL.
- the inclination directions of the first to third lug grooves 21 to 23 are the same as the tire circumferential direction, and the fourth direction
- the inclination directions of the lug groove 24 and the fifth lug groove 25 are respectively formed in the opposite directions to the first to third lug grooves 21 to 23 and the tire circumferential direction.
- each of the lug grooves 21 to 25 will be described by taking one side (left side in the drawing) of the central land portion row 30 with the tire equatorial plane CL interposed therebetween as an example.
- FIG. 2 is an enlarged plan view showing a portion X in FIG.
- the first lug groove 21 is inclined at a steep angle relatively close to the tire circumferential direction from one end portion (outer portion in the tire width direction) communicating with the main groove 11 toward the tire equatorial plane CL.
- it is formed to be inclined obliquely upward and to the right, and the other end (the tire center side) ends in the vicinity of the tire equatorial plane CL in the center land row 30.
- the second lug groove 22 has one end portion communicating with the main groove 11 arranged at a predetermined distance from the one end portion of the first lug groove 21 in the tire circumferential direction.
- the lug grooves 21 and 22 are connected to each other in the vicinity of the tire equatorial plane CL, and generally form a substantially V shape extending from the main groove 11 in an inclined manner in the tire circumferential direction.
- the third lug groove 23 is inclined from the substantially middle position in the tire width direction of the second lug groove 22 toward the tire equator plane CL at a steep angle substantially the same as the first lug groove 21. Is formed.
- the fourth lug groove 24 is provided between the first lug groove 21 and the second lug groove 22 (here, the second lug groove 22 side), and the one end force communicating with the main groove 11
- the second lug groove 22 and the tire width direction are inclined in the opposite direction and at the same angle, intersecting with the first lug groove 21 and directed toward the tire equatorial plane CL.
- the third lug groove 23 and the fourth lug groove 24 are curved in the vicinity of the tire equatorial plane CL, and the ends are connected to each other and integrated.
- each of these lug grooves 21 to 24 the groove wall of one of the third lug grooves 23 (left side in the figure) is formed in a zigzag shape, and the groove width of the second lug groove 22 is the third width.
- the lug grooves 23 are formed so as to be different from each other with the lug groove 23 therebetween, but as a whole, the first lug groove 21 in which the groove width of the fourth lug groove 24 is the smallest and the groove width of the fourth lug groove 23 is the smallest.
- the second lug groove 22 is formed to have an intermediate groove width. Further, the first lug grooves 21 and the third lug grooves 23 on both sides (see FIG.
- the shoulder land portion row 31 has one type of shoulder lug groove 26 extending substantially in the tire width direction. A plurality are arranged at regular intervals in the direction. The width of each shoulder lug groove 26 is tread The force that is widest at the end TE side is gradually narrowed toward the main groove 11 side on the inner side in the tire width direction and gradually narrows at the opening end to the main groove 11. As a result, the shoulder land portion row 31 is divided into a plurality of blocks 31B by being divided by the shoulder lug grooves 26, and the general shape force of each block 31B is gradually increased from the main groove 11 side to the tread end TE side.
- the block 31B has a circumferential force between both edges facing the shoulder lug groove 26 as viewed from the outer side in the tire radial direction.
- a plurality of sipes 29 are traversed in these blocks 30B and 31B, or one end of the blocks 30B and 31B is traversed in the blocks 30B and 31B.
- a narrow groove 27 extending in a substantially V shape is formed in each block 31B of the shoulder land portion row 31 from the inside of the block 31B toward the outside of the tread end TE.
- a predetermined portion facing each of the main grooves 11 such as the corners of the blocks 30B and 31B and the lug grooves 21 to 26 (each portion indicated by grid-like hatching in the figure) is applied to the block surface force toward the groove bottom.
- Diagonally chamfered chamfers 50 are provided at a plurality of locations in each land section row 30 and 31.
- this pneumatic tire 1 is cut into a predetermined shape by directing force into the edge force block facing each groove of the block into at least one block of the land portion row.
- This notch is a recess made locally at the edge of the block, one end opening into each groove and the other end ending inside the block.
- a cutout 40 is provided at one location of 31B.
- the notch 40 (see FIG. 2) is formed on the edge (long side) of the trapezoidal block 31B on the main groove 11 side, and the edge force of the block 31B gradually increases toward the block 31B. It is formed in a trapezoidal shape with a reduced width. That is, the notch 40 is the same as the block 31B, and viewed from the outside in the tire radial direction, the cut end (short side) in the block 31B and the open end (long side) to the main groove 11 Is a substantially trapezoidal shape (tread notch shape) in which the width of the notch in the tire circumferential direction gradually increases from the inside of the block 31B to the main groove 11 by force. And is arranged at substantially the center of the side edge of the main groove 11 of the block 31B.
- the notch 40 and the block 31B are substantially similar to each other, and are substantially line symmetric with respect to the center line S extending in the substantially tire width direction.
- the surface force in the block 31B is directed to the groove bottom (here, the groove bottom of the main groove 11) of the block 31B.
- An inclined surface (hereinafter referred to as an inclined step portion) 41 is formed integrally with the block 31B.
- the inclined step portion 41 is provided over the entire cutout portion 40, and the block 31B surface force of the cut end portion (short side portion) located in the block 31B of the cutout portion 40, It is formed so as to be gradually inclined while bending to the vicinity of the groove bottom of the opening end (long side) on the main groove 11 side.
- FIG. 3 is a cross-sectional view taken along the line FF in FIG. 2 showing a cross section of the inclined step portion 41, showing a cross-sectional shape in a direction perpendicular to the inclined step portion 41 (here, substantially the tire width direction). Yes.
- the inclined step portion 41 (step portion of the inclined surface) includes a plurality of concave curved surfaces 43 and at least two (in this case, three) protruding ridges protruding into the notch portion 40 provided therebetween.
- 42 is formed in a staircase shape, and the block 31B surface and the outermost ridge 42 in the tire radial direction, between each ridge 42, and the innermost ridge 42 in the tire radial direction and the groove bottom of the main groove 11
- a concave curved surface 43 that gently curves is provided in between.
- Each ridge 42 is mainly composed of an upper surface portion parallel to the tire width direction and a side surface portion mainly parallel to the tire radial direction, and an angle ⁇ on the tip side between the upper surface portion and the side surface portion, that is,
- the cross-sectional angle force in the cross section orthogonal to the ridge 42 at the tip of the substantially L-shaped cross section is approximately 90 degrees (here, 80 degrees to 120 degrees).
- the ridges 42 are arranged at substantially equal intervals from the surface of the block 31B to the inclination step of the inclined step portion 41, between the surface of the block 31B and the ridges 42 on the outermost side in the tire radial direction, and the ridges 42.
- the concave curved surface 43 provided between them also has substantially the same cross-sectional shape, but here, the innermost ridge 42 in the tire radial direction is disposed at a position close to the groove bottom of the main groove 11. Only the concave curved surface 43 connecting the ridge 42 and the groove bottom has a different shape shorter than the others.
- “mainly parallel to the tire width direction” means in addition to the state parallel to the tire width direction, Is mainly tilted to some extent (for example, around 10 degrees) in addition to the state parallel to the tire radial direction. Including the state.
- the edge component of the block 31B can be increased by the notch 40 provided in the block 31B, the edge effect exhibited by the block 31B can be enhanced, and And off-road traction and braking performance.
- the inclined step portion 41 formed in the notch 40 can suppress the deformation and the rigidity reduction of the block 31B, similarly to the case where the notch 40 is raised and shallowed.
- the block rigidity of the shoulder land portion row 31 can be secured, and on-road handling performance such as a dry road surface or a wet road surface can be secured.
- the step (projection 42) force of the inclined step 41 acts in the same way as the block edge in the notch 40 and mainly acts on snow and mud that have entered the notch 40. Since it works as an edge component in the lateral direction, the edge component can be increased in the depth direction of the notch 40. As a result, in addition to the edge effect on the surface of the block 31B, the edge effect is also exhibited inside the notch 40, so that handling performance on snow and off-road can improve skid resistance. .
- the cornering performance on each road surface can be improved while ensuring the traction performance and braking performance on the snow and off-road of the pneumatic tire 1, and the off-road performance and The performance on snow can be improved and the handling stability can be improved.
- a plurality of land portion rows 30 and 31 are formed in the tread portion 2 by a plurality of main grooves 11 extending in the tire circumferential direction, and the land portion rows 30 and 31 are formed as lug grooves 21 to 26. Since it is divided into multiple blocks 30B and 31B, basic performance including the drainage performance required for comfort-oriented pneumatic tires can be secured.
- the block 31B of the shoulder land portion row 31 is formed in the trapezoidal shape as seen in a plan view, and therefore, regardless of the rotational direction of the pneumatic tire 1, that is, the mounting direction to the vehicle. Therefore, constant traction performance and braking performance can always be demonstrated. At the same time, it is possible to suppress the occurrence of uneven wear that tends to occur in the shoulder land portion row 31 due to the influence of the rotation direction and the mounting position on the vehicle. Also, this block 31B Because the width is gradually reduced from the groove 11 side toward the tread end TE side, and the shoulder lug grooves 26 on both sides are made thicker toward the outer side in the tire width direction narrowing on the main groove 11 side. In addition to the above-mentioned traction performance and braking performance on snow, etc., the uneven wear resistance performance and noise performance of the shoulder land section 31 can be improved, and these performances can be made compatible.
- the cornering performance of the pneumatic tire 1 is compared with the influence of the shoulder land portion row 31 arranged between the tread end TE of the tread portion 2 and the main groove 11 on the outermost side in the tire width direction. It is known to be big. Therefore, the notch 40 is preferably formed in the block 31B of the shoulder land row 31 as in the present embodiment, but is formed in the block of another land row such as the block 30B of the central land row 30. Even so, the above-mentioned effects can be sufficiently obtained.
- the notch 40 is formed in the trapezoidal shape in plan view described above, in which the edge force of the block 31B gradually decreases in width toward the inside of the block 31B. In this case, it is possible to prevent the formation of sharp corners or narrow spaces in the cutout 40, so that snow, mud, etc. smoothly enter the corners of the cutout 40. As a result, snow, mud, etc. can be reliably grasped by the cutout portion 40, and the edge effect in the depth direction of the cutout portion 40 can be reliably exhibited.
- a notch 40 is formed in the approximate center of the main groove 11 side edge of the block 31B, and both of them have a substantially similar shape in which long sides are arranged on the main groove 11 side.
- the thickness of the block 31B is made uniform as a whole, and the reduction in rigidity is suppressed, so that a relatively large block rigidity can be secured.
- the concave curved surface 43 is formed on the inclined step 41, the movement of snow, mud, etc. entering the notch 40 is facilitated when the tire rolls. 42) It can improve the grip of snow and mud. At the same time, the notch 40 goes out of the ground plane. Occasionally, snow, mud, or the like that has entered the notch 40 is smoothly discharged from the notch 40, so that clogging or the like can be prevented. Therefore, it is desirable that the inclined step portion 41 is formed in a staircase shape including the protruding ridge 42 and the concave curved surface 43 protruding into the notch portion 40.
- the angle ⁇ of the tip of the ridge 42 formed on the inclined step portion 41 is set to an acute angle smaller than 80 degrees, the rigidity of the portion is lowered, and the function as an edge component is reduced. Wear due to mud or the like entering the notch 40 may increase.
- the obtuse angle is larger than 120 degrees, snow or mud becomes difficult to catch and the edge effect may be reduced. Therefore, it is desirable that the angle on the tip side of the ridge 42 is 80 degrees to 120 degrees.
- the two main grooves 11 are formed in the tread portion 2 with the tire equatorial plane CL interposed therebetween.
- three main grooves 11 are provided on the tire equatorial plane CL.
- the main groove 11 having another shape extending in the tire circumferential direction, such as a main groove extending in a zigzag shape, may be formed.
- the notch 40 is formed at other positions such as the edge facing each lug groove 21 to 26 and the corner where the groove intersects, in addition to the edge on the main groove 11 side of each block 30B, 31B. May be.
- the force that forms a tread pattern 10 that is point-symmetric with respect to a point on the tire equatorial plane CL for example, a tread pattern 10 that is line-symmetric with respect to the tire equatorial plane CL or an asymmetric tread pattern. 10 etc. are formed in the traded part 2 and the notch part 40 and the inclined step part 41 of this embodiment are formed in those blocks.
- the tire 1 of the example (hereinafter referred to as an example product) in which the tread pattern 10 having the structure described above (see FIG. 1) is formed, and the conventional tread pattern 110 described above (see FIG. 4).
- the tire 100 of the comparative example (conventional example) (referred to below as comparative product) was created and the following tests were performed. All these tires are JATMA YEAR BOOK ( This is a pneumatic radial tire for passenger cars with a tire size of 265Z70R17 as defined by the Japan Automobile Tire Association (2006) standard. Each groove has a groove depth of 10.5 mm.
- the implemented product is a tread pattern 10 that is point-symmetric with respect to a point on the equator plane CL, and the groove width of the two main grooves 11 is 8 mm at the narrow portion and at the wide portion. Formed to 11 mm.
- the notch 40 is connected to the block 31B of the shoulder land portion row 31, the width of the open end (long side) on the main groove 11 side is 15 mm, and the cut end (short) in the block 31B is used.
- the width of the side portion) was 7.5 mm
- the length in the tire radial direction was 10 mm
- the ridge 42 of the inclined step portion 41 was formed in three steps.
- Each lug groove of the central land section row 30 of the implemented product has the first lug groove 21 at a groove width of 5 mm and an angle of 20 degrees with respect to the tire circumferential direction, the second lug groove 22 at a groove width of 4 to 8 mm, and the tire circumference.
- the third lug groove 23 was formed at a groove width of 6 to 15 mm and an angle of 25 degrees with respect to the tire circumferential direction.
- the fourth lug groove 24 has a groove width of 3 mm and an angle with respect to the tire circumferential direction formed at 60 degrees in the opposite direction to the lug grooves 21, 22, and 23.
- lug grooves divide the central land row 30 and partition it into blocks 30B each having a width of 17 to 40 mm, and a plurality of sipes 29 having a width of 0.7 mm are formed in each block 30B.
- the comparative product was formed with a conventional notch 117 having no inclined step 41 in the block 115.
- each of the above tires was mounted on an actual vehicle at an internal pressure of 230 kPa, and each performance was evaluated by applying a load equivalent to that two people got on.
- Table 1 shows the test results of the implemented product and the comparative product in terms of indices with the result of the comparative product as 100.
- the snow braking performance index is measured by comparing the braking distance when full braking is performed from 40kmZh on the compressed snow, and the snow traction performance is the start at a distance of 50m above the compressed snow. Acceleration times are measured and compared, and each performance is evaluated. As a result, the comparison product and the implementation product were both 100, and it was found that braking performance and traction performance on snow could be maintained at the same level.
- the feeling feeling on snow is an overall evaluation of braking performance, starting performance, straight running performance, and cornering performance on a test course on a snowy road surface, and was evaluated based on the feeling of a test driver. As a result, compared with 100 for the comparative product, it was 109, which was higher for the implemented product, and the overall evaluation on snow improved.
- the off-road feeling index is a comprehensive evaluation of braking performance, starting performance, straight running performance, and cornering performance on a test track on an unpaved road, and was evaluated by feeling of a test driver.
- the value of the comparative product was as high as 107 compared to the comparative product of 100, and the overall evaluation on off-road improved.
- the dry maneuvering stability index is an evaluation of maneuvering stability on a dry road surface, and was evaluated based on the feeling of a test driver when driving a sport on various circuit modes in a dry state. As a result, compared with 100 for the comparative product, the value for the implemented product was 105, indicating that the handling stability on dry roads was improved.
- the wet maneuvering stability index is an evaluation of maneuvering stability on a wet road surface, and was evaluated based on the feeling of a test driver when driving on a circuit course in a wet state in various driving modes. As a result, compared with 100 for the comparative product, 105 It was high and the driving stability on wet roads was improved.
- the cornering performance on each road surface can be improved while ensuring the traction performance and braking performance of the pneumatic tire 1 on snow and off road, and the off road performance and snow performance are improved. It was proved that steering stability can be improved by increasing
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES07790843.2T ES2499341T3 (es) | 2006-08-03 | 2007-07-17 | Cubierta de neumático |
EP07790843.2A EP2048007B1 (en) | 2006-08-03 | 2007-07-17 | Pneumatic tire |
CN2007800274620A CN101489808B (zh) | 2006-08-03 | 2007-07-17 | 充气轮胎 |
US12/375,801 US8708009B2 (en) | 2006-08-03 | 2007-07-17 | Pneumatic tire |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-212540 | 2006-08-03 | ||
JP2006212540A JP4738276B2 (ja) | 2006-08-03 | 2006-08-03 | 空気入りタイヤ |
Publications (1)
Publication Number | Publication Date |
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WO2008015904A1 true WO2008015904A1 (fr) | 2008-02-07 |
Family
ID=38997085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/064081 WO2008015904A1 (fr) | 2006-08-03 | 2007-07-17 | Pneumatique |
Country Status (6)
Country | Link |
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US (1) | US8708009B2 (ja) |
EP (1) | EP2048007B1 (ja) |
JP (1) | JP4738276B2 (ja) |
CN (1) | CN101489808B (ja) |
ES (1) | ES2499341T3 (ja) |
WO (1) | WO2008015904A1 (ja) |
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WO2018202986A1 (fr) | 2017-05-05 | 2018-11-08 | Compagnie Generale Des Etablissements Michelin | Pneumatique a jauge d'usure explicite |
US10427470B2 (en) | 2014-10-06 | 2019-10-01 | Bridgestone Americal Tire Operations, LLC | Tire traction element |
US11427035B2 (en) | 2016-02-10 | 2022-08-30 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
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DE102017203011A1 (de) * | 2017-02-24 | 2018-08-30 | Continental Reifen Deutschland Gmbh | Fahrzeugluftreifen |
US10836215B2 (en) * | 2017-06-27 | 2020-11-17 | Sumitomo Rubber Industries, Ltd. | Tire |
JP2019104413A (ja) * | 2017-12-13 | 2019-06-27 | Toyo Tire株式会社 | 空気入りタイヤ |
JP7098962B2 (ja) | 2018-03-05 | 2022-07-12 | 住友ゴム工業株式会社 | タイヤ |
JP2019214231A (ja) * | 2018-06-11 | 2019-12-19 | 株式会社ブリヂストン | 空気入りタイヤ |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10427470B2 (en) | 2014-10-06 | 2019-10-01 | Bridgestone Americal Tire Operations, LLC | Tire traction element |
US11427035B2 (en) | 2016-02-10 | 2022-08-30 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
CN107791751A (zh) * | 2016-08-31 | 2018-03-13 | 住友橡胶工业株式会社 | 轮胎 |
CN107791751B (zh) * | 2016-08-31 | 2021-06-15 | 住友橡胶工业株式会社 | 轮胎 |
WO2018202986A1 (fr) | 2017-05-05 | 2018-11-08 | Compagnie Generale Des Etablissements Michelin | Pneumatique a jauge d'usure explicite |
Also Published As
Publication number | Publication date |
---|---|
US20090320982A1 (en) | 2009-12-31 |
ES2499341T3 (es) | 2014-09-29 |
EP2048007A1 (en) | 2009-04-15 |
US8708009B2 (en) | 2014-04-29 |
EP2048007A4 (en) | 2012-12-26 |
JP4738276B2 (ja) | 2011-08-03 |
EP2048007B1 (en) | 2014-07-09 |
CN101489808B (zh) | 2011-05-04 |
CN101489808A (zh) | 2009-07-22 |
JP2008037219A (ja) | 2008-02-21 |
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