WO2015194464A1 - Tire - Google Patents

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Publication number
WO2015194464A1
WO2015194464A1 PCT/JP2015/066965 JP2015066965W WO2015194464A1 WO 2015194464 A1 WO2015194464 A1 WO 2015194464A1 JP 2015066965 W JP2015066965 W JP 2015066965W WO 2015194464 A1 WO2015194464 A1 WO 2015194464A1
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WO
WIPO (PCT)
Prior art keywords
sipe
block
line
tire
intersection
Prior art date
Application number
PCT/JP2015/066965
Other languages
French (fr)
Japanese (ja)
Inventor
加地　与志男
崇之 藏田
辰作 片山
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2015194464A1 publication Critical patent/WO2015194464A1/en

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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
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes

Definitions

  • the present invention relates to a tire, and more particularly, to a tire with improved traction performance and handling performance on snow.
  • winter tires such as studless tires are configured to obtain traction performance and handling performance on snow by forming a plurality of sipes in blocks partitioned by circumferential grooves and lug grooves.
  • a sipe edge effect by the sipe is obtained by providing the sipe with inclination in the tire rotation direction in each block, and the traction performance on the snow The handling performance is ensured.
  • the end of the small block defined by the sipe has an acute angle, so the thickness at the block edge is reduced and the rigidity at the block edge is reduced.
  • it since it is deformed so as to be turned up by the input of force when it contacts the road surface, there is a problem that it is difficult to obtain a block edge effect.
  • the present invention provides a tire capable of improving both the traction performance and handling performance on snow by reliably obtaining the block edge effect of the entire block in addition to the sipe edge effect of sipe. Objective.
  • a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lug grooves extending in the width direction are provided, and a sipe is provided on a block defined by the circumferential grooves and the lug grooves.
  • the end of the sipe opens in a circumferential groove or lug groove
  • the end of the sipe that opens in the circumferential groove or lug groove and the partition of the block defined by the circumferential groove and lug groove
  • the angle formed between one side of the dividing line and the extension line at the end of the sipe is perpendicular to the intersection with the line, and the other side is on the extension at the end of the sipe.
  • the angle at one end side of the sipe opening becomes a right angle and the rigidity increases, it is possible to prevent the block outer periphery from being turned up due to the formation of the sipe when a force is applied to the block.
  • the sipe edge effect by sipe is obtained together with the block edge effect on the outer periphery of the block, and both traction performance and handling performance on snow can be improved.
  • FIG. 1 is a plan view showing a tread surface of a tire 1 according to an embodiment.
  • the tire 1 includes a plurality of circumferential grooves 12 to 16 extending along the tire circumferential direction on the tread surface side of the tread 11, and lug grooves 17 and 18 extending in the tire width direction so as to intersect the circumferential grooves 12 to 16. Is provided.
  • the circumferential grooves 12 to 16 the circumferential grooves 13 to 15 located on the center side in the tire width direction are so-called main grooves.
  • the circumferential groove 14 is a center main groove, and the circumferential grooves 13 and 15 adjacent to the circumferential groove 14 are side main grooves.
  • the circumferential grooves 12 and 16 are shoulder grooves located on the outermost side in the tire width direction.
  • CL shown with the dashed-dotted line of the figure is a virtual centerline which shows the center of the width direction of a tire, and the circumferential groove
  • channel 14 is formed on this virtual centerline CL.
  • the virtual center line CL side in the drawing is referred to as the inner side in the tire width direction, and the opposite side is referred to as the outer side in the tire width direction.
  • the lug grooves 17 and 18 are formed, for example, periodically along the circumferential direction of the tire 1.
  • Each of the lug grooves 17 and 18 starts from the circumferential groove 14 and is inclined from the position shifted in the circumferential direction toward the kicking side from the stepping side in the rotational direction set in the tire at a predetermined inclination angle. It extends linearly toward the shoulder grooves 12 and 16.
  • the lug groove 17 and the lug groove 18 respectively extend in the opposite direction from the circumferential groove 14 provided at the center in the tire width direction toward the outer side in the tire width direction.
  • the lug grooves 17 extend in different directions along the tire rotation center axis after intersecting with the circumferential grooves 16.
  • the lug groove 18 changes its direction and extends so as to follow the tire rotation center axis after intersecting with the circumferential groove 12.
  • the drainage at the time of contact with the snow surface is improved by inclining and extending the lug grooves 17 and 18 from the stepping side set in the tire toward the kicking side.
  • a plurality of tread blocks (hereinafter referred to as blocks) 20 and 21 are continuously defined in the tread 11 in the circumferential direction over the entire circumference of the tire by the circumferential grooves 12 to 16 and the lug grooves 17 and 18 described above.
  • the blocks 20 and 21 are center blocks formed in the tire center portion 11 ⁇ / b> A between the circumferential grooves 12 and 16.
  • the block 23 is a shoulder block formed outside the circumferential grooves 12 and 16.
  • the block 20 is defined by circumferential grooves 14; 15 adjacent in the width direction, lug grooves 17 and 17 adjacent in the circumferential direction, circumferential grooves 15; 16 and lug grooves 17 and 17 adjacent in the circumferential direction. Is done.
  • the block 21 is defined by circumferential grooves 12; 13 adjacent in the width direction, lug grooves 18, 18 adjacent in the circumferential direction, and circumferential grooves 13; 14, and lug grooves 18, 18 adjacent in the circumferential direction. .
  • the block 20 and the block 21 are formed so that the outer peripheral edge has a sawtooth substantially parallelogram shape.
  • the block 20 and the block 21 are formed symmetrically with respect to the virtual center line CL, and sipe groups 30A and 30B each including a plurality of narrow grooves are provided. Similar to the relationship between the block 20 and the block 21, the sipe group 30A formed in the block 20 is formed symmetrically with the sipe group 30B of the block 21 with the virtual center line CL as an axis of symmetry.
  • the sipe groups 30A and 30B will be described. Since the sipe groups 30A and 30B are symmetrical with each other, the sipe group 30A will be described as an example.
  • FIG. 2 is an enlarged plan view of the block 20.
  • Reference numeral 24 shown by a broken line in FIG. The lane marking 24 corresponds to the positions of the groove wall surfaces of the circumferential grooves 14 and 15 surrounding the block 20, the step-side lug groove 17, and the kick-out side lug groove 17, and indicates the outer edge of the block 20.
  • the lug groove 17 on the stepping side is shown as a lug groove 17A
  • the lug groove 17 on the kicking side is shown as a lug groove 17B.
  • the sipe group 30A includes a plurality of sipes 31-36.
  • the sipes 31 to 36 are formed at a depth shallower than the groove depths of the circumferential grooves 14 and 15 and the lug grooves 17A and 17B, for example.
  • the depth from the surface of the block 20 of each sipe 31 to 36 to the bottom of the sipe may be the same or different.
  • the sipes 31 to 36 are linearly formed in the block 20 at equal and parallel intervals, and the extending direction thereof is inclined with respect to the tire rotation direction.
  • the sipes 31 to 33 have one end opened to the circumferential groove 14 and the other end opened to the lug groove 17A.
  • the sipes 34 to 36 have one end opened to the lug groove 17B and the other end opened to the circumferential groove 15.
  • the block 20 is partitioned into a plurality of small blocks 41 to 47.
  • Each of the small blocks 41 to 47 is formed in a rectangular shape in which all corners are right angles on the tire surface. Further, the length in the longitudinal direction is gradually increased from the small block 41 to the small block 44, and the length in the longitudinal direction is gradually decreased from the small block 44 to the small block 47.
  • the length of the sipe 31 is equal to the length of the small block 41 in the longitudinal direction
  • the length of the sipe 32 is equal to the length of the small block 42 in the longitudinal direction
  • the length of the sipe 33 is equal to the length of the small block 43 in the longitudinal direction.
  • the length of the sipe 34 is equal to the length of the small block 45 in the longitudinal direction
  • the length of the sipe 35 is equal to the length of the small block 46 in the longitudinal direction
  • the length of the sipe 36 is equal to the length of the small block 47 in the longitudinal direction. equal.
  • the sipe 31 extends along the long side 42 a of the small block 42, and the ends on one end side and the other end side are orthogonal to the short sides 41 c and 41 d of the small block 41.
  • the sipe 32 extends along the long side 43 a of the small block 43, and the ends on one end side and the other end side are orthogonal to the short sides 42 c and 42 d of the small block 42.
  • the sipe 33 extends along the long side 44 a of the small block 44, and the end portions on one end side and the other end side thereof are orthogonal to the short sides 43 c and 43 d of the small block 43.
  • the sipe 34 extends along the long side 44 b of the small block 44, and the ends on one end side and the other end side are orthogonal to the short sides 45 c and 45 d of the small block 45.
  • the sipe 35 extends along the long side 45 b of the small block 45, and the end portions on one end side and the other end side are orthogonal to the short sides 46 c and 46 d of the small block 46.
  • the sipe 36 extends along the long side 45 b of the small block 46, and the ends on one end side and the other end side are orthogonal to the short sides 47 c and 47 d of the small block 47.
  • each sipe 31 to 36 is defined by the end portions on one end side and the other end side that open to the circumferential grooves 14 and 15 or the lug grooves 17A and 17B, and the circumferential grooves 14 and 15 and the lug grooves 17A and 17B.
  • An angle formed by one side of the dividing line 24 continuous from the intersection of the block 20 with the dividing line 24 and an extension line at one end and the other end of each sipe 31 to 36 Is vertical, and the other side of the partition line 24 is formed along the extension line of the sipes 31 to 36.
  • the apexes 41A to 44A that protrude toward the circumferential groove 14 in the small blocks 41 to 44 are located on one straight line along the extending direction of the circumferential groove 14.
  • the vertices 41B to 43B which are located on the inner side in the width direction than the vertices 41A to 43A and are concave with respect to the circumferential groove 14, are located on one straight line along the extending direction of the circumferential groove 14.
  • each vertex 41C to 44C that protrudes toward the lug groove 17A in the small blocks 41 to 44 is located on one straight line along the extending direction of the lug groove 17A.
  • the vertices 41D to 43D which are located on the kicking side from the vertices 41C to 43C and are concave with respect to the lug groove 17A, are located on one straight line along the extending direction of the lug groove 17A.
  • the apexes 45A to 47A that are concave on the lug groove 17B side of the small blocks 45 to 47 are positioned on one straight line along the extending direction of the lug groove 17A.
  • each vertex 45B to 47B which is located on the circumferential side kicking side with respect to each vertex 45A to 47A and protrudes with respect to the lug groove 17B, and the vertex 44B of the small block 44 are arranged along one extending direction of the lug groove 17B.
  • the apexes 45C to 47C that are concave on the circumferential groove 15 side in the small blocks 45 to 47 are positioned on one straight line along the extending direction of the circumferential groove 15. Further, the vertices 45D to 47D that are located on the outer side in the width direction than the respective vertices 45C to 47C and are convex with respect to the circumferential groove 15 and the vertices 44D of the small block 44 are arranged along one extending direction of the circumferential groove 15. Located on a straight line.
  • FIGS. 3A to 3H are diagrams showing a forming method when setting the shape of the block 20 described above.
  • the block 20 is configured based on a parallelogram block 50 as shown in FIG.
  • the block 50 is referred to as a basic block 50.
  • the basic block 50 is partitioned by the circumferential grooves 14; 15 and the lug grooves 17A; 17B.
  • straight sipes 31 to 36 are parallel to each other at equal intervals in the direction of the long diagonal T1 among the diagonals connecting the vertices P and Q and the vertices R and S located diagonally, and It is formed so as to be inclined at a predetermined angle with respect to the tire rotation direction.
  • the ends of the sipes 31 to 36 at one end side and the other end side open into the circumferential grooves 14; 15 or the lug grooves 17A; 17B, and a plurality of small blocks 51 to 57 are formed in the reference block 50.
  • straight lines L2 and L3 perpendicular to the extending direction of the sipe 31 are extended from the vertices 41B and 41D of the small block 51 partitioned by the sipe 31 to the vertex P side.
  • a triangular small block 41 is set as a rectangular small block 41 that passes through the vertex P, sets a straight line L1 parallel to the extending direction of the sipe 31, and has the intersections of the straight line L3, the straight line L1, and the straight line L2 as vertices 41A and 41C. 51 is deformed.
  • the small block 51 of the basic block 50 before deformation is a straight line extending from the end of the sipe 31 so as to be orthogonal to the extending direction of the sipe 31.
  • the intersection of L2, L3 and the straight line L1 passing through the vertex P and parallel to the sipe 31 is transformed into a small block 41 of the block 20 having new vertices 41A and 41C.
  • straight lines L4 and L5 perpendicular to the extending direction of the sipe 32 are extended from the vertices 42B and 42D of the small block 52 partitioned by the sipe 31 and the sipe 32 to the vertex P side.
  • an extension line L6 of the side 52a on the sipe 31 side is set, and the trapezoidal small block 52 is deformed as a rectangular small block 42 having the intersections of the extension line L6, the straight line L4, and the straight line L5 as vertices 42A and 42C. .
  • straight lines L7 and L8 perpendicular to the extending direction of the sipe 33 are extended from the vertices 43B and 43D of the small block 53 partitioned by the sipe 32 and the sipe 33 to the vertex P side.
  • an extension line L9 of the side 53a on the sipe 32 side is set, and the trapezoidal small block 53 is deformed as a rectangular small block 43 having vertices 43A and 43C at intersections of the extension line L9, the straight line L7, and the straight line L8. .
  • the straight lines L10 and L11 perpendicular to the extending direction of the sipe 34 from the vertices R and S of the small block 54 partitioned by the sipe 33 and sipe 34 are placed on the vertex P and vertex Q side. Set to extend to.
  • an extension line L12 of the side 54a on the sipe 33 side and an extension line L13 of the side 54b on the sipe 34 side are set, and the intersections of the extension line L12, the straight line L10, and the straight line L11 are vertices 44A and 44C, and the extension line L13 and the straight line
  • the hexagonal small block 54 is deformed as a rectangular small block 44 whose vertices 44B and 44D are the intersections of L10 and the straight line L11.
  • the small blocks 54 pass through the vertices R and S in the extending direction of the sipes 33 and 34.
  • the intersections of the orthogonal lines L10 and L11 and the extended lines L12 and L13 of the sipes 33 and 34 are transformed into the small blocks 44 of the block 20 having new vertices 44A to 44D.
  • straight lines L14 and L15 perpendicular to the extending direction of the sipe 35 are extended from the vertices 45A and 45C of the small block 55 partitioned by the sipe 34 and sipe 35 to the vertex Q side.
  • an extension line L16 of the side 55b on the sipe 35 side is set, and the trapezoidal small block 55 is deformed as a rectangular small block 45 having the intersections of the extension line L16, the straight line L14, and the straight line L15 as vertices 45B and 45D. .
  • straight lines L17 and L18 perpendicular to the extending direction of the sipe 36 are extended from the vertices 46A and 46C of the small block 56 partitioned by the sipe 35 and sipe 36 to the vertex Q side.
  • an extension line L19 of the side 56b on the sipe 36 side is set, and the trapezoidal small block 56 is deformed as a rectangular small block 46 having the intersections of the extension line L19 and the straight lines L17 and L18 as vertices 46B and 46D. .
  • the straight lines L20 and L21 orthogonal to the extending direction of the sipe 36 are extended from the vertices 47A and 47C of the small block 57 partitioned by the sipe 36 to the vertex Q side.
  • a triangular small block 47 is set as a rectangular small block 47 that passes through the vertex Q, sets a straight line L22 parallel to the extending direction of the sipe 36, and has the intersections of the straight line L22, the straight line L20, and the straight line L21 as vertices 47B and 47D. 57 is deformed.
  • the small block 57 of the basic block 50 before deformation is a straight line extending from the end of the sipe 36 so as to be orthogonal to the extending direction of the sipe 36.
  • the intersection of L20 and the straight line L21 passing through the vertex L20 and parallel to the sipe 36 is transformed into a small block 47 of the block 20 having new vertices 47B and 47D.
  • the sipe provided in the basic block and the basic block are partitioned as follows. It is good to deform
  • the sipe 31, 36 of the sipe 31 to 36 corresponds to this case.
  • straight lines L2 and L3 extending from the intersection of the sipe 31 and the lane line U to the lane line that forms an acute angle ⁇ with the sipe 31 so as to be orthogonal to the extending direction of the sipe 31, and the sipe 31
  • the basic block 50 is deformed so that the intersections with the straight line L1 that is in contact with the vertex P of the basic block 50 that is parallel to the sipe 31 and forms the acute angle ⁇ with the sipe 31 are the vertices 41A and 41C.
  • the sipe 36 as shown in FIG.
  • the sipe 36 is extended from the intersection of the sipe 36 and the lane line U to the lane line that forms an acute angle ⁇ with the sipe 36 so as to be orthogonal to the extending direction of the sipe 36.
  • the basic block so that the intersections of the straight lines L20 and L21 and the straight line L22 that is in contact with the vertex Q of the basic block 50 that is parallel to the sipe 36 and forms the acute angle ⁇ with the sipe 36 are the vertices 47B and 47D. 50 is transformed.
  • the sipe adjacent to this sipe is between the sipe and the sipe between the sipe and the sipe, the sipe and the sipe It is deformed so that the intersection of the straight line extending from the intersection of the sipe to the sipe line side that makes an acute angle with the sipe and orthogonal to the sipe extension direction and the extension line of the sipe adjacent to the sipe is the vertex. That is, as shown in FIG. 3C, the angle formed between the lane marking U of the basic block 50 and the sipes 31 to 36 in the above embodiment is an acute angle ⁇ , and the sipes 31 to 36 on the acute angle ⁇ side.
  • the sipes 32 to 35 of the sipes 31 to 36 correspond to this case.
  • straight lines L4 and L5 extending from the intersection of the sipe 32 and the lane marking U to the lane line forming an acute angle with the sipe 32 so as to be orthogonal to the extending direction of the sipe 32, and the sipe 32 Are deformed so that the intersections with the extension line L6 of the sipe 31 adjacent to the sipe 31 become the vertices 42A and 42C. Further, as shown in FIG.
  • the sipe 33 is perpendicular to the extending direction of the sipe 33 from the intersection of the sipe 33 and the lane line U to the lane line that forms the acute angle ⁇ with the sipe 33.
  • the sipe 34 is perpendicular to the extending direction of the sipe 34 from the intersection of the sipe 34 and the lane line U to the lane line that forms the acute angle ⁇ with the sipe 34.
  • the straight lines L14, L15 extended to sipe 34 and the extension line L16 of the sipe 35 adjacent to the sipe 34 are deformed so that the intersections become the vertices 45B, 45D.
  • the sipe 35 is perpendicular to the extending direction of the sipe 35 from the intersection of the sipe 35 and the lane line U to the lane line that forms the acute angle ⁇ with the sipe 35.
  • the straight lines L17 and L18 extended to the sipe 35 and the extension line L19 of the sipe 36 adjacent to the sipe 35 are deformed so as to be the vertices 46B and 46D.
  • the angle between the sipe and the sipe is an obtuse angle. Then, the sipe is deformed so that the intersection point between the sipe adjacent to the sipe and the straight line extending from the intersection point to the sipe side so as to be orthogonal to the extending direction of the adjacent sipe is a vertex. That is, the sipe 31 to 36 and the sipe 31 to 36 are adjacent to the sipe 31 to 36 and the sipe 31 to 36 on the side where the angle between the sipe 31 to 36 and the sipe 31 to 36 is the obtuse angle ⁇ .
  • sipes 31 to 36 When there is a sipe, that is, all of the sipes 31 to 36 correspond to this case.
  • Deformation is performed so that the intersections with the straight lines L4 and L5 extending so as to be orthogonal to each other become the vertices 42A and 42C.
  • the sipes 32 to 36 can be similarly modified.
  • the extension line of the sipe and the vertex of the basic block It is deformed so that the intersection with the straight line perpendicular to the extending direction of the sipe is a vertex. That is, when there is a sipe adjacent to the sipe 31 to 36 on the side of the obtuse angle ⁇ between the partition line U of the basic block 50 and the sipe 31 to 36 in the present embodiment, Of the sipes 31 to 36, the sipes 33 and 34 correspond to this case.
  • the extension line L12 of the sipe 33 and the vertices R and S of the basic block 50 which are the end points of the partition line U that forms the obtuse angle ⁇ with the sipe 33, are orthogonal to the extension direction of the sipe 33.
  • the intersections with the straight lines L10 and L11 to be deformed are the vertices 44A and 44C.
  • the sipe 34 is in contact with the extension line L13 of the sipe 34 and the vertices R and S of the basic block 50 that are the end points of the sipe 34 and an obtuse angle ⁇ and is orthogonal to the extension direction of the sipe 34.
  • the intersections with the straight lines L10 and L11 to be deformed are the vertices 44B and 44D.
  • the sipe extension line and sipe It is preferable to deform so that the intersection of a straight line that is parallel to the sipe and an obtuse angle with the sipe is an apex.
  • the block 20 deformed in this way can be returned to the shape of the basic block 50 before deformation by connecting the intersection point where the partition line 24 of the deformed block 20 and the extension of the sipes 31 to 36 intersect with a straight line. it can.
  • the block edge effect can be suitably obtained together with the sipe edge effect, and the traction performance and handling performance can be further improved.
  • the table shown in FIG. 4 is a table showing the tire performance test results when the sipe interval formed in the block is changed in order to examine the effect of the sipe according to the embodiment in more detail.
  • a conventional tire and an inventive tire were prepared and an actual vehicle test was conducted.
  • the block having the sipe shown in FIG. 3A is used for the conventional tire, and the block shown in FIG. 3A is modified as the basic block 50 for the inventive tire to form the block having the sipe shown in FIG. did.
  • the tire size was 205 / 55R16, and the internal pressure was 220kPa.
  • Each tire was mounted on a passenger car, and a snow acceleration performance test (traction test) and a snow handling performance test were conducted.
  • the acceleration performance test on the snow was evaluated by the time (acceleration time) from the start to the 50 m travel after fully opening the accelerator.
  • the handling performance on snow is evaluated with a feeling score, and all the results are expressed as an index. Also, the larger the index, the better the table.
  • the improvement effect of the present invention could be confirmed as compared with the conventional tire. In particular, it was confirmed that a better result was obtained by selecting the sipe interval from 3.0 mm to 6.0 mm.
  • the shape of the basic block 50 is a parallelogram shape.
  • the shape of the basic block may be any shape, and preferably deformed based on a sipe provided in the basic block. It is good to form so that the angle of all the corners of a block may become a right-angled polygonal shape.
  • the sipe formed on the block is described as being linear, the extension direction of the end opening to the circumferential groove or the lug groove is orthogonal to one side of the dividing line, and the other side is an extension at the end of the sipe.
  • the intermediate section connecting the end on one end side and the end on the other end side may be bent or curved, or may be formed in a wavy or continuous broken line shape (jagged shape), Or you may form in the shape which combined these.
  • the ground contact area may be modified to be the same.
  • the block 20 may be deformed so that the partition line of the basic block 50 passes through the midpoints of the short sides 41c to 47c and the short sides 41d to 47d of the small blocks 41 to 47 of the block 20 shown in FIG. .
  • the ground contact area of the basic block 50 is the same.
  • the block 20 may be formed in a reduced size, or the sipe width of the deformed block 20 may be widened for adjustment.
  • the sipe interval is set to be narrow within the range obtained from the results of the tire performance test so that the change from the ground contact area of the basic block 50 is small, instead of being deformed so that the ground contact area is the same.
  • Block 20 may be formed. Further, in the above-described embodiment, it has been described that both ends of the sipe are open to the circumferential groove or the lug groove. However, the end on one side is open and the end on the other side is not opened. Alternatively, sipes may be formed so as to terminate in the block. Further, both ends of the sipe may be formed so as to terminate in the block without opening.
  • a sipe is provided in a basic block set as a basic shape to form a block, and an angle formed by the sipe and a partition line of the basic block is an acute angle, and the sipe If there is no sipe adjacent to the sipe between the sipe and the sipe that forms an acute angle, the sipe is perpendicular to the extension direction of the sipe from the intersection of the sipe and the sipe to the sipe and the sipe An intersection of a straight line extended so as to be parallel to the sipe and in contact with a straight line that forms an acute angle with the sipe, and adjacent to the sipe between the sipe and the straight line that forms an acute angle with the sipe When there is a sipe to be slid, a straight line extending from the intersection of the sipe and the stake line to the sipe line side forming an acute angle with the sipe so as to be orthogonal to the extension direction of the sipe, and the sipe The intersection between the sipe and the extension line of the sipe adjacent to
  • the block Since the block is formed by deforming the basic block with the intersection with the straight line extending to the sipe side as a vertex, the angle at one end side of the sipe opening in the block becomes a right angle and is rigid Because increases, can prevent the turn-up in the block outer periphery due to the formation of the sipe when the force on the block is applied. Thereby, the sipe edge effect by sipe is obtained together with the block edge effect on the outer periphery of the block, and both traction performance and handling performance on snow can be improved.
  • the block includes a plurality of sipes, and a plurality of small blocks are defined by the plurality of sipes.
  • the sipe edge is formed by edges of a plurality of small blocks formed by the plurality of sipes.
  • the effect can be further enhanced to improve the traction performance and handling performance on snow.
  • at least one of the shapes of the small block on the tire surface is a polygon whose right angles are right angles, the block edge effect can be surely obtained regardless of the input direction from the block. it can.
  • at least one of the shapes of the small blocks on the tire surface is a quadrangle having right angles, so that the block edge effect can be reliably obtained.
  • the small blocks are formed at equal intervals in the block, and the interval is set to 3.0 mm or more and 6.0 mm or less, a sipe edge effect can be obtained together with a block edge effect.
  • the block rigidity is improved in addition to the sipe edge effect, so that the block edge effect can be suitably obtained in addition to the sipe edge effect, so that the traction performance and the handling performance on the road surface on snow. Both can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

In order to provide a tire that enables an increase in traction performance and handling performance on the snow, a tire is provided with a plurality of circumferential grooves (14, 15) extending in a tire circumferential direction, and a plurality of lug grooves (17A, 17B) extending in a width direction, the circumferential grooves (14, 15) and the lug grooves (17A, 17B) defining blocks (20) including sipes (31 to 36), wherein: the ends of the sipes (31 to 36) are opened or terminated at the circumferential grooves (14, 15) or the lug grooves (17A, 17B); one side of a defining line (24) of the blocks (20) which is continuous along the boundary of intersecting points of the sipes (31 to 36) and the defining line (24), and an extension at the ends of the sipes (31 to 36) form a vertical angle, while the other side of the defining line (24) is disposed on the extension at the ends of the sipes (31 to 36).

Description

タイヤtire
　本発明は、タイヤに関し、特に雪上におけるトラクション性能、及びハンドリング性能が向上するタイヤに関する。 The present invention relates to a tire, and more particularly, to a tire with improved traction performance and handling performance on snow.
　従来、スタッドレスタイヤ等の冬用タイヤでは、周方向溝やラグ溝に区画されたブロック内に複数のサイプを形成することで雪上におけるトラクション性能やハンドリング性能を得るように構成されている。特許文献１に示すように、このようなブロック内に形成されるサイプとして、各ブロック内においてタイヤ回転方向に対して傾斜して設けることで、サイプによるサイプエッジ効果を得て、雪上におけるトラクション性能やハンドリング性能を確保するようにしている。
　しかしながら、ブロックの区画線に対して傾斜してサイプを形成した場合、サイプによって区画された小ブロックの端部が鋭角となるため、ブロック縁部での厚さが薄くなり、ブロック縁部における剛性が低下して、路面に接地したときの力の入力によりめくれるように変形するため、ブロックエッジ効果が得にくいという問題があった。 Conventionally, winter tires such as studless tires are configured to obtain traction performance and handling performance on snow by forming a plurality of sipes in blocks partitioned by circumferential grooves and lug grooves. As shown in Patent Document 1, as a sipe formed in such a block, a sipe edge effect by the sipe is obtained by providing the sipe with inclination in the tire rotation direction in each block, and the traction performance on the snow The handling performance is ensured.
However, when a sipe is formed at an incline with respect to the block demarcation line, the end of the small block defined by the sipe has an acute angle, so the thickness at the block edge is reduced and the rigidity at the block edge is reduced. However, since it is deformed so as to be turned up by the input of force when it contacts the road surface, there is a problem that it is difficult to obtain a block edge effect.
特開２０１２－８６６６５号公報JP 2012-86665 A
　本発明は、上記課題を解決するため、サイプによるサイプエッジ効果に加え、ブロック全体によるブロックエッジ効果を確実に得て、雪上におけるトラクション性能、及びハンドリング性能の両方を向上可能なタイヤを提供することを目的とする。 In order to solve the above-mentioned problems, the present invention provides a tire capable of improving both the traction performance and handling performance on snow by reliably obtaining the block edge effect of the entire block in addition to the sipe edge effect of sipe. Objective.
　上記課題を解決するためのタイヤの構成として、タイヤ周方向に延びる複数の周方向溝と幅方向に延びる複数のラグ溝とを備え、前記周方向溝及びラグ溝により区画されたブロックにサイプを有するタイヤにおいて、前記サイプの端部が周方向溝又はラグ溝に開口し、前記サイプの周方向溝又はラグ溝に開口する端部と、周方向溝及びラグ溝により区画された前記ブロックの区画線との交点を境にして連続する前記区画線の一方側と前記サイプの端部における延長線とのなす角度が垂直であり、他方側が前記サイプの端部における延長上にあるので、ブロックにおいてサイプの開口する一端側の角度が直角となり剛性が上がるため、ブロックに力が作用したときのサイプの形成に起因するブロック外周におけるめくれを防止できる。これにより、ブロック外周におけるブロックエッジ効果とともに、サイプによるサイプエッジ効果が得られ、雪上におけるトラクション性能及びハンドリング性能の両方を向上できる。 As a configuration of a tire for solving the above problems, a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lug grooves extending in the width direction are provided, and a sipe is provided on a block defined by the circumferential grooves and the lug grooves. In the tire having, the end of the sipe opens in a circumferential groove or lug groove, the end of the sipe that opens in the circumferential groove or lug groove, and the partition of the block defined by the circumferential groove and lug groove In the block, the angle formed between one side of the dividing line and the extension line at the end of the sipe is perpendicular to the intersection with the line, and the other side is on the extension at the end of the sipe. Since the angle at one end side of the sipe opening becomes a right angle and the rigidity increases, it is possible to prevent the block outer periphery from being turned up due to the formation of the sipe when a force is applied to the block. Thereby, the sipe edge effect by sipe is obtained together with the block edge effect on the outer periphery of the block, and both traction performance and handling performance on snow can be improved.
実施形態に係るタイヤの踏面を示す図である。It is a figure which shows the tread of the tire which concerns on embodiment. ブロックの拡大図である。It is an enlarged view of a block. ブロックの設定方法を示す図である。It is a figure which shows the setting method of a block. 実施形態に係るタイヤの性能試験結果を示す表である。It is a table | surface which shows the performance test result of the tire which concerns on embodiment.
　以下、発明の実施形態を通じて本発明を詳説するが、以下の実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態の中で説明される特徴の組み合わせのすべてが発明の解決手段に必須であるとは限らず、選択的に採用される構成を含むものである。 Hereinafter, the present invention will be described in detail through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included in the invention. It is not necessarily essential to the solution, but includes a configuration that is selectively adopted.
　図１は、実施形態に係るタイヤ１のトレッド表面を示す平面図である。以下、図面に基づき本発明について説明する。タイヤ１は、トレッド１１の踏面側にタイヤ周方向に沿って延びる複数本の周方向溝１２～１６と、周方向溝１２～１６と交差するようにタイヤ幅方向に延びるラグ溝１７，１８とを備える。周方向溝１２～１６のうち、タイヤ幅方向中央側に位置する周方向溝１３～１５は、いわゆる主溝である。また、主溝のうち周方向溝１４がセンター主溝、周方向溝１４に隣接する周方向溝１３，１５がサイド主溝である。また、周方向溝１２，１６は、タイヤ幅方向最外側に位置するショルダー溝である。なお、同図の一点鎖線で示すＣＬは、タイヤの幅方向中心を示す仮想中心線であり、この仮想中心線ＣＬ上に周方向溝１４が形成されている。以下、図面における仮想中心線ＣＬ側をタイヤ幅方向内側、その逆側をタイヤ幅方向外側という。 FIG. 1 is a plan view showing a tread surface of a tire 1 according to an embodiment. The present invention will be described below with reference to the drawings. The tire 1 includes a plurality of circumferential grooves 12 to 16 extending along the tire circumferential direction on the tread surface side of the tread 11, and lug grooves 17 and 18 extending in the tire width direction so as to intersect the circumferential grooves 12 to 16. Is provided. Of the circumferential grooves 12 to 16, the circumferential grooves 13 to 15 located on the center side in the tire width direction are so-called main grooves. Of the main grooves, the circumferential groove 14 is a center main groove, and the circumferential grooves 13 and 15 adjacent to the circumferential groove 14 are side main grooves. The circumferential grooves 12 and 16 are shoulder grooves located on the outermost side in the tire width direction. In addition, CL shown with the dashed-dotted line of the figure is a virtual centerline which shows the center of the width direction of a tire, and the circumferential groove | channel 14 is formed on this virtual centerline CL. Hereinafter, the virtual center line CL side in the drawing is referred to as the inner side in the tire width direction, and the opposite side is referred to as the outer side in the tire width direction.
　ラグ溝１７，１８は、タイヤ１の周方向に沿って例えば周期的に形成される。ラグ溝１７，１８は、それぞれ周方向溝１４を起点とし、周方向に位置ずれした位置から、所定の傾斜角度でタイヤに設定される回転方向の踏込側から蹴出側に向けて傾斜し、ショルダー溝１２，１６に向けて直線状に延長する。ラグ溝１７とラグ溝１８とは、タイヤ幅方向中央に設けられた周方向溝１４からタイヤ幅方向外側に向けてそれぞれ逆向きに延長している。ラグ溝１７は、周方向溝１６と交差後にタイヤ回転中心軸に沿うように方向を変えて延長する。ラグ溝１８は、周方向溝１２との交差後にタイヤ回転中心軸に沿うように方向を変えて延長する。このように、ラグ溝１７，１８をタイヤに設定される回転方向の踏込側から蹴出側に向けて傾斜して延長させることにより、雪面との接地時の排水性を向上させる。 The lug grooves 17 and 18 are formed, for example, periodically along the circumferential direction of the tire 1. Each of the lug grooves 17 and 18 starts from the circumferential groove 14 and is inclined from the position shifted in the circumferential direction toward the kicking side from the stepping side in the rotational direction set in the tire at a predetermined inclination angle. It extends linearly toward the shoulder grooves 12 and 16. The lug groove 17 and the lug groove 18 respectively extend in the opposite direction from the circumferential groove 14 provided at the center in the tire width direction toward the outer side in the tire width direction. The lug grooves 17 extend in different directions along the tire rotation center axis after intersecting with the circumferential grooves 16. The lug groove 18 changes its direction and extends so as to follow the tire rotation center axis after intersecting with the circumferential groove 12. Thus, the drainage at the time of contact with the snow surface is improved by inclining and extending the lug grooves 17 and 18 from the stepping side set in the tire toward the kicking side.
　上述の周方向溝１２～１６及びラグ溝１７，１８により、トレッド１１には、複数のトレッドブロック（以下、ブロックという）２０，２１がタイヤ一周分にわたり周方向に連続して画成される。ブロック２０，２１は、周方向溝１２，１６の間のタイヤセンター部１１Ａに形成されたセンターブロックである。なお、ブロック２３は、周方向溝１２，１６の外側に形成されたショルダーブロックである。 A plurality of tread blocks (hereinafter referred to as blocks) 20 and 21 are continuously defined in the tread 11 in the circumferential direction over the entire circumference of the tire by the circumferential grooves 12 to 16 and the lug grooves 17 and 18 described above. The blocks 20 and 21 are center blocks formed in the tire center portion 11 </ b> A between the circumferential grooves 12 and 16. The block 23 is a shoulder block formed outside the circumferential grooves 12 and 16.
　ブロック２０は、幅方向に隣接する周方向溝１４；１５と、周方向に隣接するラグ溝１７，１７、及び周方向溝１５；１６と、周方向に隣接するラグ溝１７，１７とにより区画される。ブロック２１は、幅方向に隣接する周方向溝１２；１３と周方向に隣接するラグ溝１８，１８、及び周方向溝１３；１４と、周方向に隣接するラグ溝１８，１８により区画される。 The block 20 is defined by circumferential grooves 14; 15 adjacent in the width direction, lug grooves 17 and 17 adjacent in the circumferential direction, circumferential grooves 15; 16 and lug grooves 17 and 17 adjacent in the circumferential direction. Is done. The block 21 is defined by circumferential grooves 12; 13 adjacent in the width direction, lug grooves 18, 18 adjacent in the circumferential direction, and circumferential grooves 13; 14, and lug grooves 18, 18 adjacent in the circumferential direction. .
　ブロック２０及びブロック２１は、外周の縁が鋸歯状の略平行四辺形状となるように形成される。ブロック２０とブロック２１とは、仮想中心線ＣＬを挟んで対称形状に形成され、それぞれ複数の細溝からなるサイプ群３０Ａ，３０Ｂが設けられている。ブロック２０に形成されるサイプ群３０Ａは、ブロック２０と，ブロック２１との関係と同様に、仮想中心線ＣＬを対称軸としてブロック２１のサイプ群３０Ｂと対称形状に形成されている。以下、サイプ群３０Ａ，３０Ｂについて説明するが、サイプ群３０Ａ，３０Ｂは互いに対称であるため、サイプ群３０Ａを例として説明する。 The block 20 and the block 21 are formed so that the outer peripheral edge has a sawtooth substantially parallelogram shape. The block 20 and the block 21 are formed symmetrically with respect to the virtual center line CL, and sipe groups 30A and 30B each including a plurality of narrow grooves are provided. Similar to the relationship between the block 20 and the block 21, the sipe group 30A formed in the block 20 is formed symmetrically with the sipe group 30B of the block 21 with the virtual center line CL as an axis of symmetry. Hereinafter, the sipe groups 30A and 30B will be described. Since the sipe groups 30A and 30B are symmetrical with each other, the sipe group 30A will be described as an example.
　図２は、ブロック２０の拡大平面図である。同図の破線で示す２４は、ブロック２０を区画する区画線である。区画線２４は、ブロック２０を囲う周方向溝１４，１５、踏込側のラグ溝１７、蹴出側のラグ溝１７の溝壁面の位置に対応し、ブロック２０の外縁を示している。以下の説明において踏込側のラグ溝１７をラグ溝１７Ａ、蹴出側のラグ溝１７をラグ溝１７Ｂとして示す。サイプ群３０Ａは、複数のサイプ３１～３６により構成される。サイプ３１～３６は、例えば、周方向溝１４，１５及びラグ溝１７Ａ，１７Ｂの溝深さよりも浅い深さで形成される。なお、各サイプ３１～３６のブロック２０の表面からサイプ底部までの深さは、同一であっても異なっていてもよい。 FIG. 2 is an enlarged plan view of the block 20. Reference numeral 24 shown by a broken line in FIG. The lane marking 24 corresponds to the positions of the groove wall surfaces of the circumferential grooves 14 and 15 surrounding the block 20, the step-side lug groove 17, and the kick-out side lug groove 17, and indicates the outer edge of the block 20. In the following description, the lug groove 17 on the stepping side is shown as a lug groove 17A, and the lug groove 17 on the kicking side is shown as a lug groove 17B. The sipe group 30A includes a plurality of sipes 31-36. The sipes 31 to 36 are formed at a depth shallower than the groove depths of the circumferential grooves 14 and 15 and the lug grooves 17A and 17B, for example. The depth from the surface of the block 20 of each sipe 31 to 36 to the bottom of the sipe may be the same or different.
　サイプ３１～３６は、互いに平行かつ均等な間隔でブロック２０内に直線状に形成され、その延長方向は、タイヤの回転方向に対して傾斜している。サイプ３１～３３は、一端側が周方向溝１４に開口し、他端側がラグ溝１７Ａに開口する。また、サイプ３４～３６は、一端側がラグ溝１７Ｂに開口し、他端側が周方向溝１５に開口する。
　これらサイプ３１～３６により、ブロック２０には、複数の小ブロック４１～４７が区画される。各小ブロック４１～４７は、タイヤ表面においてすべての角が直角の長方形状に形成されている。また、小ブロック４１から小ブロック４４にかけて長手方向の長さが漸次長く形成され、小ブロック４４から小ブロック４７にかけて長手方向の長さが漸次短く形成される。 The sipes 31 to 36 are linearly formed in the block 20 at equal and parallel intervals, and the extending direction thereof is inclined with respect to the tire rotation direction. The sipes 31 to 33 have one end opened to the circumferential groove 14 and the other end opened to the lug groove 17A. The sipes 34 to 36 have one end opened to the lug groove 17B and the other end opened to the circumferential groove 15.
By these sipes 31 to 36, the block 20 is partitioned into a plurality of small blocks 41 to 47. Each of the small blocks 41 to 47 is formed in a rectangular shape in which all corners are right angles on the tire surface. Further, the length in the longitudinal direction is gradually increased from the small block 41 to the small block 44, and the length in the longitudinal direction is gradually decreased from the small block 44 to the small block 47.
　サイプ３１の長さは小ブロック４１の長手方向の長さと等しく、サイプ３２の長さは小ブロック４２の長手方向の長さと等しく、サイプ３３の長さは小ブロック４３の長手方向の長さと等しく、サイプ３４の長さは小ブロック４５の長手方向の長さと等しく、サイプ３５の長さは小ブロック４６の長手方向の長さと等しく、サイプ３６の長さは小ブロック４７の長手方向の長さと等しい。 The length of the sipe 31 is equal to the length of the small block 41 in the longitudinal direction, the length of the sipe 32 is equal to the length of the small block 42 in the longitudinal direction, and the length of the sipe 33 is equal to the length of the small block 43 in the longitudinal direction. The length of the sipe 34 is equal to the length of the small block 45 in the longitudinal direction, the length of the sipe 35 is equal to the length of the small block 46 in the longitudinal direction, and the length of the sipe 36 is equal to the length of the small block 47 in the longitudinal direction. equal.
　サイプ３１は、小ブロック４２の長辺４２ａに沿って延長し、一端側及び他端側の端部が小ブロック４１の短辺４１ｃ，４１ｄと直交している。また、サイプ３２は、小ブロック４３の長辺４３ａに沿って延長し、一端側及び他端側の端部が小ブロック４２の短辺４２ｃ，４２ｄと直交している。また、サイプ３３は、小ブロック４４の長辺４４ａに沿って延長し、一端側及び他端側の端部が小ブロック４３の短辺４３ｃ，４３ｄと直交している。また、サイプ３４は、小ブロック４４の長辺４４ｂに沿って延長し、一端側及び他端側の端部が小ブロック４５の短辺４５ｃ，４５ｄと直交している。また、サイプ３５は、小ブロック４５の長辺４５ｂに沿って延長し、一端側及び他端側の端部が小ブロック４６の短辺４６ｃ，４６ｄと直交している。また、サイプ３６は、小ブロック４６の長辺４５ｂに沿って延長し、一端側及び他端側の端部が小ブロック４７の短辺４７ｃ，４７ｄと直交している。 The sipe 31 extends along the long side 42 a of the small block 42, and the ends on one end side and the other end side are orthogonal to the short sides 41 c and 41 d of the small block 41. The sipe 32 extends along the long side 43 a of the small block 43, and the ends on one end side and the other end side are orthogonal to the short sides 42 c and 42 d of the small block 42. The sipe 33 extends along the long side 44 a of the small block 44, and the end portions on one end side and the other end side thereof are orthogonal to the short sides 43 c and 43 d of the small block 43. The sipe 34 extends along the long side 44 b of the small block 44, and the ends on one end side and the other end side are orthogonal to the short sides 45 c and 45 d of the small block 45. The sipe 35 extends along the long side 45 b of the small block 45, and the end portions on one end side and the other end side are orthogonal to the short sides 46 c and 46 d of the small block 46. The sipe 36 extends along the long side 45 b of the small block 46, and the ends on one end side and the other end side are orthogonal to the short sides 47 c and 47 d of the small block 47.
　即ち、各サイプ３１～３６は、周方向溝１４，１５又はラグ溝１７Ａ，１７Ｂに開口する一端側及び他端側の端部と、周方向溝１４，１５及びラグ溝１７Ａ，１７Ｂにより画成されたブロック２０の区画線２４との交点を境にして連続する区画線２４の一方側と、各サイプ３１～３６の一端側の端部及び他端側の端部における延長線とのなす角度が垂直であり、区画線２４の他方側がサイプ３１～３６の延長線に沿うように形成されている。 That is, each sipe 31 to 36 is defined by the end portions on one end side and the other end side that open to the circumferential grooves 14 and 15 or the lug grooves 17A and 17B, and the circumferential grooves 14 and 15 and the lug grooves 17A and 17B. An angle formed by one side of the dividing line 24 continuous from the intersection of the block 20 with the dividing line 24 and an extension line at one end and the other end of each sipe 31 to 36 Is vertical, and the other side of the partition line 24 is formed along the extension line of the sipes 31 to 36.
　小ブロック４１～４４における周方向溝１４側に凸となる各頂点４１Ａ～４４Ａは、周方向溝１４の延長方向に沿う一つの直線上に位置する。また、各頂点４１Ａ～４３Ａよりも幅方向内側に位置し、周方向溝１４に対して凹となる各頂点４１Ｂ～４３Ｂは、周方向溝１４の延長方向に沿う一つの直線上に位置する。
　また、小ブロック４１～４４におけるラグ溝１７Ａ側に凸となる各頂点４１Ｃ～４４Ｃは、ラグ溝１７Ａの延長方向に沿う一つの直線上に位置する。
　また、各頂点４１Ｃ～４３Ｃよりも蹴出側に位置し、ラグ溝１７Ａに対して凹となる各頂点４１Ｄ～４３Ｄは、ラグ溝１７Ａの延長方向に沿う一つの直線上に位置する。
　また、小ブロック４５～４７のラグ溝１７Ｂ側に凹となる各頂点４５Ａ～４７Ａは、ラグ溝１７Ａの延長方向に沿う一つの直線上に位置する。
　また、各頂点４５Ａ～４７Ａよりも周方向蹴出側に位置しラグ溝１７Ｂに対して凸となる各頂点４５Ｂ～４７Ｂ及び小ブロック４４の頂点４４Ｂは、ラグ溝１７Ｂの延長方向に沿う一つの直線上に位置する。
　また、小ブロック４５～４７における周方向溝１５側に凹となる各頂点４５Ｃ～４７Ｃは、周方向溝１５の延長方向に沿う一つの直線上に位置する。
　また、各頂点４５Ｃ～４７Ｃよりも幅方向外側に位置し、周方向溝１５に対して凸となる各頂点４５Ｄ～４７Ｄ及び小ブロック４４の頂点４４Ｄは周方向溝１５の延長方向に沿う一つの直線上に位置する。 The apexes 41A to 44A that protrude toward the circumferential groove 14 in the small blocks 41 to 44 are located on one straight line along the extending direction of the circumferential groove 14. Further, the vertices 41B to 43B, which are located on the inner side in the width direction than the vertices 41A to 43A and are concave with respect to the circumferential groove 14, are located on one straight line along the extending direction of the circumferential groove 14.
Further, each vertex 41C to 44C that protrudes toward the lug groove 17A in the small blocks 41 to 44 is located on one straight line along the extending direction of the lug groove 17A.
Further, the vertices 41D to 43D, which are located on the kicking side from the vertices 41C to 43C and are concave with respect to the lug groove 17A, are located on one straight line along the extending direction of the lug groove 17A.
The apexes 45A to 47A that are concave on the lug groove 17B side of the small blocks 45 to 47 are positioned on one straight line along the extending direction of the lug groove 17A.
Further, each vertex 45B to 47B, which is located on the circumferential side kicking side with respect to each vertex 45A to 47A and protrudes with respect to the lug groove 17B, and the vertex 44B of the small block 44 are arranged along one extending direction of the lug groove 17B. Located on a straight line.
The apexes 45C to 47C that are concave on the circumferential groove 15 side in the small blocks 45 to 47 are positioned on one straight line along the extending direction of the circumferential groove 15.
Further, the vertices 45D to 47D that are located on the outer side in the width direction than the respective vertices 45C to 47C and are convex with respect to the circumferential groove 15 and the vertices 44D of the small block 44 are arranged along one extending direction of the circumferential groove 15. Located on a straight line.
　図３（ａ）～（ｈ）は、上述のブロック２０の形状を設定するときの形成方法を示す図である。ブロック２０は、図３（ａ）に示すような、平行四辺形のブロック５０を基本として構成される。以下、ブロック５０を基本ブロック５０という。基本ブロック５０は、周方向溝１４；１５及びラグ溝１７Ａ；１７Ｂにより区画されている。基本ブロック５０には、対角に位置する頂点Ｐ，Ｑ及び頂点Ｒ，Ｓを結ぶ対角線のうち、長さの長い対角線Ｔ１方向に均等な間隔で直線状のサイプ３１～３６が互いに平行、かつタイヤ回転方向に対して所定角度傾斜するように形成される。サイプ３１～３６は、一端側及び他端側の端部が周方向溝１４；１５又はラグ溝１７Ａ；１７Ｂに開口し、基準ブロック５０内に複数の小ブロック５１～５７が形成される。 FIGS. 3A to 3H are diagrams showing a forming method when setting the shape of the block 20 described above. The block 20 is configured based on a parallelogram block 50 as shown in FIG. Hereinafter, the block 50 is referred to as a basic block 50. The basic block 50 is partitioned by the circumferential grooves 14; 15 and the lug grooves 17A; 17B. In the basic block 50, straight sipes 31 to 36 are parallel to each other at equal intervals in the direction of the long diagonal T1 among the diagonals connecting the vertices P and Q and the vertices R and S located diagonally, and It is formed so as to be inclined at a predetermined angle with respect to the tire rotation direction. The ends of the sipes 31 to 36 at one end side and the other end side open into the circumferential grooves 14; 15 or the lug grooves 17A; 17B, and a plurality of small blocks 51 to 57 are formed in the reference block 50.
　次に、図３（ｂ）に示すように、サイプ３１により区画された小ブロック５１の頂点４１Ｂ，４１Ｄからサイプ３１の延長方向と直交する直線Ｌ２，Ｌ３を頂点Ｐ側に延長するように設定する。また、頂点Ｐを通り、サイプ３１の延長方向と平行な直線Ｌ１を設定し、直線Ｌ３と直線Ｌ１及び直線Ｌ２の交点を頂点４１Ａ，４１Ｃとする長方形状の小ブロック４１として三角形状の小ブロック５１を変形する。すなわち、変形前の基本ブロック５０の小ブロック５１は、サイプ３１に最も近い基本ブロック５０の頂点Ｐが鋭角であるため、サイプ３１の端部からサイプ３１の延長方向と直交するように延長した直線Ｌ２，Ｌ３と、当該頂点Ｐを通りサイプ３１と平行な直線Ｌ１との交点を新たな頂点４１Ａ，４１Ｃとするブロック２０の小ブロック４１に変形される。 Next, as shown in FIG. 3B, straight lines L2 and L3 perpendicular to the extending direction of the sipe 31 are extended from the vertices 41B and 41D of the small block 51 partitioned by the sipe 31 to the vertex P side. To do. Further, a triangular small block 41 is set as a rectangular small block 41 that passes through the vertex P, sets a straight line L1 parallel to the extending direction of the sipe 31, and has the intersections of the straight line L3, the straight line L1, and the straight line L2 as vertices 41A and 41C. 51 is deformed. That is, since the vertex P of the basic block 50 closest to the sipe 31 is an acute angle, the small block 51 of the basic block 50 before deformation is a straight line extending from the end of the sipe 31 so as to be orthogonal to the extending direction of the sipe 31. The intersection of L2, L3 and the straight line L1 passing through the vertex P and parallel to the sipe 31 is transformed into a small block 41 of the block 20 having new vertices 41A and 41C.
　次に、図３（ｃ）に示すように、サイプ３１及びサイプ３２により区画された小ブロック５２の頂点４２Ｂ，４２Ｄからサイプ３２の延長方向と直交する直線Ｌ４，Ｌ５を頂点Ｐ側に延長するように設定する。また、サイプ３１側の辺５２ａの延長線Ｌ６を設定し、延長線Ｌ６と直線Ｌ４及び直線Ｌ５の交点を頂点４２Ａ，４２Ｃとする長方形状の小ブロック４２として台形状の小ブロック５２を変形する。 Next, as shown in FIG. 3C, straight lines L4 and L5 perpendicular to the extending direction of the sipe 32 are extended from the vertices 42B and 42D of the small block 52 partitioned by the sipe 31 and the sipe 32 to the vertex P side. Set as follows. Further, an extension line L6 of the side 52a on the sipe 31 side is set, and the trapezoidal small block 52 is deformed as a rectangular small block 42 having the intersections of the extension line L6, the straight line L4, and the straight line L5 as vertices 42A and 42C. .
　次に、図３（ｄ）に示すように、サイプ３２及びサイプ３３により区画された小ブロック５３の頂点４３Ｂ，４３Ｄからサイプ３３の延長方向と直交する直線Ｌ７，Ｌ８を頂点Ｐ側に延長するように設定する。また、サイプ３２側の辺５３ａの延長線Ｌ９を設定し、延長線Ｌ９と直線Ｌ７及び直線Ｌ８の交点を頂点４３Ａ，４３Ｃとする長方形状の小ブロック４３として台形状の小ブロック５３を変形する。 Next, as shown in FIG. 3D, straight lines L7 and L8 perpendicular to the extending direction of the sipe 33 are extended from the vertices 43B and 43D of the small block 53 partitioned by the sipe 32 and the sipe 33 to the vertex P side. Set as follows. In addition, an extension line L9 of the side 53a on the sipe 32 side is set, and the trapezoidal small block 53 is deformed as a rectangular small block 43 having vertices 43A and 43C at intersections of the extension line L9, the straight line L7, and the straight line L8. .
　次に、図３（ｅ）に示すように、サイプ３３及びサイプ３４により区画された小ブロック５４の頂点Ｒ，Ｓからサイプ３４の延長方向と直交する直線Ｌ１０，Ｌ１１を頂点Ｐ及び頂点Ｑ側に延長するように設定する。また、サイプ３３側の辺５４ａの延長線Ｌ１２及びサイプ３４側の辺５４ｂの延長線Ｌ１３を設定し、延長線Ｌ１２と直線Ｌ１０及び直線Ｌ１１の交点を頂点４４Ａ，４４Ｃとし、延長線Ｌ１３と直線Ｌ１０及び直線Ｌ１１の交点を頂点４４Ｂ，４４Ｄとする長方形状の小ブロック４４として六角形状の小ブロック５４を変形する。
　すなわち、変形前の基本ブロック５０の小ブロック５４は、サイプ３３、３４に最も近い基本ブロック５０の頂点Ｒ，Ｓが鈍角であるため、当該頂点Ｒ，Ｓを通りサイプ３３，３４の延長方向に直交する直線Ｌ１０，Ｌ１１と、サイプ３３、３４の延長線Ｌ１２、Ｌ１３との交点を新たな頂点４４Ａ乃至４４Ｄとするブロック２０の小ブロック４４に変形される。 Next, as shown in FIG. 3E, the straight lines L10 and L11 perpendicular to the extending direction of the sipe 34 from the vertices R and S of the small block 54 partitioned by the sipe 33 and sipe 34 are placed on the vertex P and vertex Q side. Set to extend to. Further, an extension line L12 of the side 54a on the sipe 33 side and an extension line L13 of the side 54b on the sipe 34 side are set, and the intersections of the extension line L12, the straight line L10, and the straight line L11 are vertices 44A and 44C, and the extension line L13 and the straight line The hexagonal small block 54 is deformed as a rectangular small block 44 whose vertices 44B and 44D are the intersections of L10 and the straight line L11.
That is, in the small block 54 of the basic block 50 before the deformation, since the vertices R and S of the basic block 50 closest to the sipes 33 and 34 are obtuse angles, the small blocks 54 pass through the vertices R and S in the extending direction of the sipes 33 and 34. The intersections of the orthogonal lines L10 and L11 and the extended lines L12 and L13 of the sipes 33 and 34 are transformed into the small blocks 44 of the block 20 having new vertices 44A to 44D.
　次に、図３（ｆ）に示すように、サイプ３４及びサイプ３５により区画された小ブロック５５の頂点４５Ａ，４５Ｃからサイプ３５の延長方向と直交する直線Ｌ１４，Ｌ１５を頂点Ｑ側に延長するように設定する。また、サイプ３５側の辺５５ｂの延長線Ｌ１６を設定し、延長線Ｌ１６と直線Ｌ１４及び直線Ｌ１５の交点を頂点４５Ｂ，４５Ｄとする長方形状の小ブロック４５として台形状の小ブロック５５を変形する。 Next, as shown in FIG. 3 (f), straight lines L14 and L15 perpendicular to the extending direction of the sipe 35 are extended from the vertices 45A and 45C of the small block 55 partitioned by the sipe 34 and sipe 35 to the vertex Q side. Set as follows. Further, an extension line L16 of the side 55b on the sipe 35 side is set, and the trapezoidal small block 55 is deformed as a rectangular small block 45 having the intersections of the extension line L16, the straight line L14, and the straight line L15 as vertices 45B and 45D. .
　次に、図３（ｇ）に示すように、サイプ３５及びサイプ３６により区画された小ブロック５６の頂点４６Ａ，４６Ｃからサイプ３６の延長方向と直交する直線Ｌ１７，Ｌ１８を頂点Ｑ側に延長するように設定する。また、サイプ３６側の辺５６ｂの延長線Ｌ１９を設定し、延長線Ｌ１９と直線Ｌ１７及び直線Ｌ１８の交点を頂点４６Ｂ，４６Ｄとする長方形状の小ブロック４６として台形状の小ブロック５６を変形する。 Next, as shown in FIG. 3G, straight lines L17 and L18 perpendicular to the extending direction of the sipe 36 are extended from the vertices 46A and 46C of the small block 56 partitioned by the sipe 35 and sipe 36 to the vertex Q side. Set as follows. Further, an extension line L19 of the side 56b on the sipe 36 side is set, and the trapezoidal small block 56 is deformed as a rectangular small block 46 having the intersections of the extension line L19 and the straight lines L17 and L18 as vertices 46B and 46D. .
　次に、図３（ｈ）に示すように、サイプ３６により区画された小ブロック５７の頂点４７Ａ，４７Ｃからサイプ３６の延長方向と直交する直線Ｌ２０，Ｌ２１を頂点Ｑ側に延長するように設定する。また、頂点Ｑを通り、サイプ３６の延長方向と平行な直線Ｌ２２を設定し、直線Ｌ２２と直線Ｌ２０及び直線Ｌ２１の交点を頂点４７Ｂ，４７Ｄとする長方形状の小ブロック４７として三角形状の小ブロック５７を変形する。すなわち、変形前の基本ブロック５０の小ブロック５７は、サイプ３６に最も近い基本ブロック５０の頂点Ｑが鋭角であるため、サイプ３６の端部からサイプ３６の延長方向と直交するように延長した直線Ｌ２０と、当該頂点Ｌ２０を通りサイプ３６と平行な直線Ｌ２１との交点を新たな頂点４７Ｂ，４７Ｄとするブロック２０の小ブロック４７に変形される。 Next, as shown in FIG. 3 (h), the straight lines L20 and L21 orthogonal to the extending direction of the sipe 36 are extended from the vertices 47A and 47C of the small block 57 partitioned by the sipe 36 to the vertex Q side. To do. Further, a triangular small block 47 is set as a rectangular small block 47 that passes through the vertex Q, sets a straight line L22 parallel to the extending direction of the sipe 36, and has the intersections of the straight line L22, the straight line L20, and the straight line L21 as vertices 47B and 47D. 57 is deformed. That is, since the vertex Q of the basic block 50 closest to the sipe 36 is an acute angle, the small block 57 of the basic block 50 before deformation is a straight line extending from the end of the sipe 36 so as to be orthogonal to the extending direction of the sipe 36. The intersection of L20 and the straight line L21 passing through the vertex L20 and parallel to the sipe 36 is transformed into a small block 47 of the block 20 having new vertices 47B and 47D.
　上記実施形態で説明したように、ブロックを形成するために基本形状となる基本ブロックを設定し、変形する場合には、下記のように、あらかじめ基本ブロックに設けたサイプと、基本ブロックを区画する区画線との交差角度に応じて変形するとよい。
　基本ブロックの区画線とサイプとの交差する角度が鋭角であり、サイプと鋭角をなす区画線とサイプとの間において、このサイプに隣接するサイプがない場合には、サイプと区画線との交点からサイプと鋭角をなす区画線側にサイプの延長方向と直交するように延長した直線と、上記サイプに平行かつ上記サイプと鋭角をなす区画線に接する直線との交点が頂点となるように変形する。
　すなわち、図３（ｂ）に示すように、上記実施形態における基本ブロック５０の区画線Ｕと、サイプ３１乃至３６のなす角が鋭角αの側において、サイプ３１乃至３６と鋭角αをなす区画線Ｕとサイプ３１乃至３６との間に隣接するサイプがない場合、つまり上記実施形態ではサイプ３１乃至３６のうちのサイプ３１，３６がこの場合に相当する。そして、サイプ３１の場合には、サイプ３１と区画線Ｕとの交点からサイプ３１と鋭角αをなす区画線側にサイプ３１の延長方向と直交するように延長した直線Ｌ２，Ｌ３と、サイプ３１に平行かつサイプ３１と鋭角αを形成する区画線Ｕの端点である基本ブロック５０の頂点Ｐに接する直線Ｌ１との交点が頂点４１Ａ，４１Ｃとなるように基本ブロック５０を変形する。サイプ３６の場合には、図３（ｈ）に示すように、サイプ３６と区画線Ｕとの交点からサイプ３６と鋭角αをなす区画線側にサイプ３６の延長方向と直交するように延長した直線Ｌ２０，Ｌ２１と、サイプ３６に平行かつサイプ３６と鋭角αを形成する区画線Ｕの端点である基本ブロック５０の頂点Ｑに接する直線Ｌ２２との交点が頂点４７Ｂ，４７Ｄとなるように基本ブロック５０を変形する。
　また、基本ブロックの区画線とサイプとの交差する角度が鋭角であり、サイプと鋭角をなす区画線とサイプとの間に、このサイプに隣接するサイプがある場合には、サイプと区画線との交点からサイプと鋭角をなす区画線側にサイプの延長方向と直交するように延長した直線と、上記サイプに隣接するサイプの延長線との交点が頂点となるように変形する。
　すなわち、図３（ｃ）に示すように、上記実施形態における基本ブロック５０の区画線Ｕと、サイプ３１乃至３６とのなす角が鋭角αであり、この鋭角αの側においてサイプ３１乃至３６と鋭角αをなす区画線Ｕとサイプ３１乃至３６との間に隣接するサイプがある場合、つまりサイプ３１乃至３６のうちのサイプ３２乃至３５がこの場合に相当する。そして、サイプ３２の場合には、サイプ３２と区画線Ｕとの交点からサイプ３２と鋭角を形成する区画線側にサイプ３２の延長方向と直交するように延長した直線Ｌ４、Ｌ５と、サイプ３２に隣接するサイプ３１の延長線Ｌ６との交点が頂点４２Ａ，４２Ｃとなるように変形する。また、図３（ｄ）に示すように、サイプ３３の場合には、サイプ３３と区画線Ｕとの交点からサイプ３３と鋭角αを形成する区画線側にサイプ３３の延長方向と直交するように延長した直線Ｌ７，Ｌ８と、サイプ３３に隣接するサイプ３２の延長線Ｌ９との交点が頂点４３Ａ，４３Ｃとなるように変形する。また、図３（ｆ）に示すように、サイプ３４の場合には、サイプ３４と区画線Ｕとの交点からサイプ３４と鋭角αを形成する区画線側にサイプ３４の延長方向と直交するように延長した直線Ｌ１４，Ｌ１５と、サイプ３４に隣接するサイプ３５の延長線Ｌ１６との交点が頂点４５Ｂ，４５Ｄとなるように変形する。また、図３（ｇ）に示すように、サイプ３５の場合には、サイプ３５と区画線Ｕとの交点からサイプ３５と鋭角αを形成する区画線側にサイプ３５の延長方向と直交するように延長した直線Ｌ１７，Ｌ１８と、サイプ３５に隣接するサイプ３６の延長線Ｌ１９との交点が頂点４６Ｂ，４６Ｄとなるように変形する。
　また、基本ブロックの区画線とサイプとの交差する角度が鈍角であり、サイプと鈍角をなす区画線とサイプとの間に、このサイプと隣接するサイプがある場合には、サイプの延長線と、このサイプに隣接するサイプと区画線との交点から隣接するサイプの延長方向と直交するようにサイプ側に延長した直線との交点が頂点となるように変形する。
　すなわち、上記実施形態における基本ブロック５０の区画線Ｕと、サイプ３１乃至３６のなす角が鈍角βの側においてサイプ３１乃至３６と鈍角βをなす区画線とサイプ３１乃至３６との間に隣接するサイプがある場合、つまりサイプ３１乃至３６のすべてがこの場合に相当する。サイプ３１の場合には、サイプ３１の延長線Ｌ６と、鈍角β側でサイプ３１に隣接するサイプ３２と区画線Ｕとの交点からサイプ３１側に、サイプ３１に隣接するサイプ３２の延長方向と直交するように延長した直線Ｌ４，Ｌ５との交点が頂点４２Ａ，４２Ｃとなるように変形する。サイプ３２乃至サイプ３６についても同様に変形できる。
　なお、基本ブロックの区画線とサイプとの交差する角度が鈍角であり、サイプと、サイプと隣接するサイプの間に基本ブロックの頂点がある場合には、サイプの延長線と、基本ブロックの頂点を通り、サイプの延長方向と直交する直線との交点が頂点となるように変形する。すなわち、本実施形態における基本ブロック５０の区画線Ｕと、サイプ３１乃至３６のなす角が鈍角βの側において、サイプ３１乃至３６に隣接するサイプがあり、基本ブロック５０の頂点がある場合、つまりサイプ３１乃至３６のうちサイプ３３，３４がこの場合に相当する。そして、サイプ３３の場合には、サイプ３３の延長線Ｌ１２と、サイプ３３と鈍角βを形成する区画線Ｕの端点である基本ブロック５０の頂点Ｒ，Ｓに接し、サイプ３３の延長方向と直交する直線Ｌ１０，Ｌ１１との交点が頂点４４Ａ，４４Ｃとなるように変形する。また、サイプ３４の場合には、サイプ３４の延長線Ｌ１３と、サイプ３４と鈍角βを形成する区画線Ｕの端点である基本ブロック５０の頂点Ｒ，Ｓに接し、サイプ３４の延長方向と直交する直線Ｌ１０，Ｌ１１との交点が頂点４４Ｂ，４４Ｄとなるように変形する。
　また、基本ブロックの区画線とサイプとの交差する角度が鈍角であり、サイプと鈍角をなす区画線とサイプとの間に、サイプと隣接するサイプがない場合は、サイプの延長線、及びサイプと平行かつサイプと鈍角をなす区画線に接する直線の交点が頂点となるように変形すると良い。
　このように変形されたブロック２０は、変形後のブロック２０の区画線２４とサイプ３１乃至３６の延長とが交差する交点を直線で結ぶことにより、変形前の基本ブロック５０の形状に戻すことができる。 As described in the above embodiment, when a basic block to be a basic shape is set and deformed in order to form a block, the sipe provided in the basic block and the basic block are partitioned as follows. It is good to deform | transform according to the intersection angle with a division line.
If the sipe and the sipe intersect at an acute angle, and there is no sipe adjacent to the sipe between the sipe and the sipe, the intersection between the sipe and the sipe Deformation so that the intersection of a straight line extending perpendicularly to the sipe extension direction from the sipe to the sipe and the straight line parallel to the sipe and in contact with the sipe and the straight line forming an acute angle To do.
That is, as shown in FIG. 3B, the lane markings forming the acute angle α with the sipe 31 to 36 on the side where the angle between the lane marking U of the basic block 50 and the sipe 31 to 36 in the above embodiment is the acute angle α. When there is no adjacent sipe between U and the sipe 31 to 36, that is, in the above embodiment, the sipe 31, 36 of the sipe 31 to 36 corresponds to this case. In the case of the sipe 31, straight lines L2 and L3 extending from the intersection of the sipe 31 and the lane line U to the lane line that forms an acute angle α with the sipe 31 so as to be orthogonal to the extending direction of the sipe 31, and the sipe 31 The basic block 50 is deformed so that the intersections with the straight line L1 that is in contact with the vertex P of the basic block 50 that is parallel to the sipe 31 and forms the acute angle α with the sipe 31 are the vertices 41A and 41C. In the case of the sipe 36, as shown in FIG. 3 (h), the sipe 36 is extended from the intersection of the sipe 36 and the lane line U to the lane line that forms an acute angle α with the sipe 36 so as to be orthogonal to the extending direction of the sipe 36. The basic block so that the intersections of the straight lines L20 and L21 and the straight line L22 that is in contact with the vertex Q of the basic block 50 that is parallel to the sipe 36 and forms the acute angle α with the sipe 36 are the vertices 47B and 47D. 50 is transformed.
In addition, if the sipe adjacent to this sipe is between the sipe and the sipe between the sipe and the sipe, the sipe and the sipe It is deformed so that the intersection of the straight line extending from the intersection of the sipe to the sipe line side that makes an acute angle with the sipe and orthogonal to the sipe extension direction and the extension line of the sipe adjacent to the sipe is the vertex.
That is, as shown in FIG. 3C, the angle formed between the lane marking U of the basic block 50 and the sipes 31 to 36 in the above embodiment is an acute angle α, and the sipes 31 to 36 on the acute angle α side. When there is an adjacent sipe between the lane marking U forming the acute angle α and the sipes 31 to 36, that is, the sipes 32 to 35 of the sipes 31 to 36 correspond to this case. In the case of the sipe 32, straight lines L4 and L5 extending from the intersection of the sipe 32 and the lane marking U to the lane line forming an acute angle with the sipe 32 so as to be orthogonal to the extending direction of the sipe 32, and the sipe 32 Are deformed so that the intersections with the extension line L6 of the sipe 31 adjacent to the sipe 31 become the vertices 42A and 42C. Further, as shown in FIG. 3D, in the case of the sipe 33, the sipe 33 is perpendicular to the extending direction of the sipe 33 from the intersection of the sipe 33 and the lane line U to the lane line that forms the acute angle α with the sipe 33. Are deformed so that the intersections of the straight lines L7 and L8 extended to sipe 33 and the extended line L9 of the sipe 32 adjacent to the sipe 33 become the vertices 43A and 43C. Further, as shown in FIG. 3F, in the case of the sipe 34, the sipe 34 is perpendicular to the extending direction of the sipe 34 from the intersection of the sipe 34 and the lane line U to the lane line that forms the acute angle α with the sipe 34. The straight lines L14, L15 extended to sipe 34 and the extension line L16 of the sipe 35 adjacent to the sipe 34 are deformed so that the intersections become the vertices 45B, 45D. Further, as shown in FIG. 3G, in the case of the sipe 35, the sipe 35 is perpendicular to the extending direction of the sipe 35 from the intersection of the sipe 35 and the lane line U to the lane line that forms the acute angle α with the sipe 35. The straight lines L17 and L18 extended to the sipe 35 and the extension line L19 of the sipe 36 adjacent to the sipe 35 are deformed so as to be the vertices 46B and 46D.
If the sipe adjacent to this sipe is between the sipe and the sipe between the sipe and the sipe, the angle between the sipe and the sipe is an obtuse angle. Then, the sipe is deformed so that the intersection point between the sipe adjacent to the sipe and the straight line extending from the intersection point to the sipe side so as to be orthogonal to the extending direction of the adjacent sipe is a vertex.
That is, the sipe 31 to 36 and the sipe 31 to 36 are adjacent to the sipe 31 to 36 and the sipe 31 to 36 on the side where the angle between the sipe 31 to 36 and the sipe 31 to 36 is the obtuse angle β. When there is a sipe, that is, all of the sipes 31 to 36 correspond to this case. In the case of the sipe 31, the extension line L6 of the sipe 31 and the extension direction of the sipe 32 adjacent to the sipe 31 from the intersection of the sipe 32 adjacent to the sipe 31 on the obtuse angle β side to the sipe 31 side. Deformation is performed so that the intersections with the straight lines L4 and L5 extending so as to be orthogonal to each other become the vertices 42A and 42C. The sipes 32 to 36 can be similarly modified.
If the angle between the sipe and the block line of the basic block is obtuse, and there is a vertex of the basic block between the sipe and the sipe adjacent to the sipe, the extension line of the sipe and the vertex of the basic block It is deformed so that the intersection with the straight line perpendicular to the extending direction of the sipe is a vertex. That is, when there is a sipe adjacent to the sipe 31 to 36 on the side of the obtuse angle β between the partition line U of the basic block 50 and the sipe 31 to 36 in the present embodiment, Of the sipes 31 to 36, the sipes 33 and 34 correspond to this case. In the case of the sipe 33, the extension line L12 of the sipe 33 and the vertices R and S of the basic block 50, which are the end points of the partition line U that forms the obtuse angle β with the sipe 33, are orthogonal to the extension direction of the sipe 33. The intersections with the straight lines L10 and L11 to be deformed are the vertices 44A and 44C. Further, in the case of the sipe 34, the sipe 34 is in contact with the extension line L13 of the sipe 34 and the vertices R and S of the basic block 50 that are the end points of the sipe 34 and an obtuse angle β and is orthogonal to the extension direction of the sipe 34. The intersections with the straight lines L10 and L11 to be deformed are the vertices 44B and 44D.
In addition, if the sipe intersects the sipe with the sipe and the sipe does not have an adjacent sipe between the sipe and the sipe, the sipe extension line and sipe It is preferable to deform so that the intersection of a straight line that is parallel to the sipe and an obtuse angle with the sipe is an apex.
The block 20 deformed in this way can be returned to the shape of the basic block 50 before deformation by connecting the intersection point where the partition line 24 of the deformed block 20 and the extension of the sipes 31 to 36 intersect with a straight line. it can.
　以上説明したように、基本ブロック５０を設定し、基本ブロック５０に設定したサイプに基づいて、基本ブロック５０の形状を変更することにより、サイプにより区画された小ブロックの端部の鋭角部分をなくすことができるので、サイプエッジ効果とともにブロックエッジ効果を好適に得て、トラクション性能及びハンドリング性能をより向上させることができる。 As described above, by setting the basic block 50 and changing the shape of the basic block 50 based on the sipe set in the basic block 50, the acute angle portion at the end of the small block partitioned by the sipe is eliminated. Therefore, the block edge effect can be suitably obtained together with the sipe edge effect, and the traction performance and handling performance can be further improved.
　図４に示す表は、実施形態に係るサイプの効果をより詳細に調べるために、ブロックに形成するサイプ間隔を変更したときのタイヤの性能試験結果を示す表である。タイヤの性能試験は、従来タイヤ、発明タイヤを用意し、実車試験を行った。なお，従来タイヤには図３（ａ）で示すサイプを有するブロックを用い、発明タイヤには図３（ａ）で示すブロックを基本ブロック５０として変形し、図２に示すサイプを有するブロックを形成した。タイヤサイズは205/55R16で，内圧220kPaを充填した。各タイヤを乗用車に装着し，雪上加速性能試験（トラクション試験）及び雪上ハンドリング性能試験を行った。雪上加速性能試験は静止状態からアクセルを全開し、スタートから５０ｍ走行するまでの時間（加速タイム）で評価した。雪上ハンドリング性能はフィーリング評点で評価し、その結果は全て指数で表現している。また、指数が大きい程、表が良である。図４に示すように、従来タイヤと比べて，本発明の改良効果を確認することができた。特に、サイプ間隔を３．０ｍｍ以上６．０ｍｍ以下から選択することで、より良好な結果が得られることが確認された。 The table shown in FIG. 4 is a table showing the tire performance test results when the sipe interval formed in the block is changed in order to examine the effect of the sipe according to the embodiment in more detail. For the tire performance test, a conventional tire and an inventive tire were prepared and an actual vehicle test was conducted. In addition, the block having the sipe shown in FIG. 3A is used for the conventional tire, and the block shown in FIG. 3A is modified as the basic block 50 for the inventive tire to form the block having the sipe shown in FIG. did. The tire size was 205 / 55R16, and the internal pressure was 220kPa. Each tire was mounted on a passenger car, and a snow acceleration performance test (traction test) and a snow handling performance test were conducted. The acceleration performance test on the snow was evaluated by the time (acceleration time) from the start to the 50 m travel after fully opening the accelerator. The handling performance on snow is evaluated with a feeling score, and all the results are expressed as an index. Also, the larger the index, the better the table. As shown in FIG. 4, the improvement effect of the present invention could be confirmed as compared with the conventional tire. In particular, it was confirmed that a better result was obtained by selecting the sipe interval from 3.0 mm to 6.0 mm.
　なお、上記実施形態では、基本ブロック５０の形状を平行四辺形状としたが、基本ブロックの形状は、どのような形状であっても良く、好ましくは基本ブロックに設けられたサイプに基づいて変形したブロックのすべての角の角度が直角の多角形状となるように形成するとよい。
　また、ブロックに形成されるサイプを直線状として説明したが、周方向溝やラグ溝に開口する端部の延長方向が交差する区画線の一方側と直交し、他方側がサイプの端部における延長方向と同一であれば良く、一端側の端部と他端側の端部とを結ぶ中間区間が屈曲又は湾曲、或は波状又は連続する折れ線状（ギザギザ状）に形成されていても良く、又はこれらを組み合わせた形状で形成されていても良い。 In the above embodiment, the shape of the basic block 50 is a parallelogram shape. However, the shape of the basic block may be any shape, and preferably deformed based on a sipe provided in the basic block. It is good to form so that the angle of all the corners of a block may become a right-angled polygonal shape.
In addition, although the sipe formed on the block is described as being linear, the extension direction of the end opening to the circumferential groove or the lug groove is orthogonal to one side of the dividing line, and the other side is an extension at the end of the sipe. The intermediate section connecting the end on one end side and the end on the other end side may be bent or curved, or may be formed in a wavy or continuous broken line shape (jagged shape), Or you may form in the shape which combined these.
　また、上述のように、基本ブロック５０からブロック２０を構成する場合、接地面積が同じになるように変形すると良い。この場合、図２に示したブロック２０の小ブロック４１～４７の各短辺４１ｃ～４７ｃ及び短辺４１ｄ～４７ｄの中点を基本ブロック５０の区画線が通るようにブロック２０を変形すれば良い。また、接地面積が同じになるように変形する他の方法として、上記実施形態で説明した変形方法により基本ブロック５０をブロック２０に変形させたのち、基本ブロック５０の接地面積と同じになるように、ブロック２０を縮小して形成したり、変形後のブロック２０のサイプの幅を広くして、調整するようにしても良い。また、接地面積が同じになるように変形するのではなく、基本ブロック５０の接地面積からの変化が小さくなるように、上記タイヤの性能試験結果で得られた範囲でサイプ間隔を狭く設定してブロック２０を形成しても良い。
　また、上記実施形態では、サイプの両方の端部が周方向溝又はラグ溝に開口するとして説明したが、いずれか一方の側の端部が開口し、他方の側の端部が開口せずにブロック内で終端するようにサイプを形成しても良い。また、サイプの両方の端部が、開口せずにブロック内で終端するように形成されていても良い。 Further, as described above, when the block 20 is configured from the basic block 50, the ground contact area may be modified to be the same. In this case, the block 20 may be deformed so that the partition line of the basic block 50 passes through the midpoints of the short sides 41c to 47c and the short sides 41d to 47d of the small blocks 41 to 47 of the block 20 shown in FIG. . Further, as another method of deforming so that the ground contact area becomes the same, after the basic block 50 is transformed into the block 20 by the deformation method described in the above embodiment, the ground contact area of the basic block 50 is the same. The block 20 may be formed in a reduced size, or the sipe width of the deformed block 20 may be widened for adjustment. In addition, the sipe interval is set to be narrow within the range obtained from the results of the tire performance test so that the change from the ground contact area of the basic block 50 is small, instead of being deformed so that the ground contact area is the same. Block 20 may be formed.
Further, in the above-described embodiment, it has been described that both ends of the sipe are open to the circumferential groove or the lug groove. However, the end on one side is open and the end on the other side is not opened. Alternatively, sipes may be formed so as to terminate in the block. Further, both ends of the sipe may be formed so as to terminate in the block without opening.
　また、上述したように、ブロックを形成するために基本形状として設定された基本ブロックにサイプを設け、前記サイプと前記基本ブロックの区画線とのなす角が鋭角の場合であって、前記サイプと鋭角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがない場合は、前記サイプと前記区画線との交点から前記サイプと鋭角をなす区画線側に前記サイプの延長方向と直交するように延長した直線と、前記サイプに平行かつ前記サイプと鋭角をなす区画線に接する直線との交点を頂点とし、前記サイプと鋭角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがある場合は、前記サイプと前記区画線との交点から前記サイプと鋭角をなす区画線側に前記サイプの延長方向と直交するように延長した直線と、前記サイプに隣接するサイプの延長線との交点を頂点とし、前記サイプと前記基本ブロックの区画線とのなす角が鈍角の場合であって、前記サイプと鈍角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがない場合は、前記サイプの延長線と、前記サイプに平行かつ前記サイプと鈍角をなす区画線に接する直線との交点を頂点とし、前記サイプと鈍角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがある場合は、前記サイプの延長線と、前記サイプに隣接するサイプと区画線との交点から前記隣接するサイプの延長方向と直交するように前記サイプ側に延長した直線との交点を頂点として前記基本ブロックを変形して形成されたブロックを備えたので、ブロックにおいてサイプの開口する一端側の角度が直角となり剛性が上がるため、ブロックに力が作用したときのサイプの形成に起因するブロック外周におけるめくれを防止できる。これにより、ブロック外周におけるブロックエッジ効果とともに、サイプによるサイプエッジ効果が得られ、雪上におけるトラクション性能及びハンドリング性能の両方を向上できる。
　また、前記ブロックは、前記サイプを複数備え、前記複数のサイプにより複数の小ブロックが画成されたので、前記ブロックエッジ効果に加え、複数のサイプにより形成された複数の小ブロックのエッジによるサイプエッジ効果をより高めて、雪上におけるトラクション性能及びハンドリング性能を向上できる。
　また、前記小ブロックのタイヤ表面における形状のうち少なくとも一つは、すべての角が直角の多角形であるので、ブロックに対してどの方向から入力があっても確実にブロックエッジ効果を得ることができる。
　また、前記小ブロックのタイヤ表面における形状のうち少なくとも一つは、すべての角が直角の四角形であるので、確実にブロックエッジ効果を得ることができる。
　また、前記小ブロックは、前記ブロックに均等な間隔で形成され、前記間隔を３．０ｍｍ以上６．０ｍｍ以下に設定したので、ブロックエッジ効果とともにサイプエッジ効果を得ることができる。 In addition, as described above, a sipe is provided in a basic block set as a basic shape to form a block, and an angle formed by the sipe and a partition line of the basic block is an acute angle, and the sipe If there is no sipe adjacent to the sipe between the sipe and the sipe that forms an acute angle, the sipe is perpendicular to the extension direction of the sipe from the intersection of the sipe and the sipe to the sipe and the sipe An intersection of a straight line extended so as to be parallel to the sipe and in contact with a straight line that forms an acute angle with the sipe, and adjacent to the sipe between the sipe and the straight line that forms an acute angle with the sipe When there is a sipe to be slid, a straight line extending from the intersection of the sipe and the stake line to the sipe line side forming an acute angle with the sipe so as to be orthogonal to the extension direction of the sipe, and the sipe The intersection between the sipe and the extension line of the sipe adjacent to the sipe is an apex, and the angle between the sipe and the division line of the basic block is an obtuse angle, and between the sipe and the division line that forms an obtuse angle When there is no sipe adjacent to the sipe, an intersection of the extension line of the sipe and a straight line that is parallel to the sipe and touches a lane line that forms an obtuse angle with the sipe, and a lane line that forms an obtuse angle with the sipe, When there is a sipe adjacent to the sipe between the sipe, the extension of the sipe and the intersection of the sipe adjacent to the sipe and the partition line are orthogonal to the extension direction of the adjacent sipe. Since the block is formed by deforming the basic block with the intersection with the straight line extending to the sipe side as a vertex, the angle at one end side of the sipe opening in the block becomes a right angle and is rigid Because increases, can prevent the turn-up in the block outer periphery due to the formation of the sipe when the force on the block is applied. Thereby, the sipe edge effect by sipe is obtained together with the block edge effect on the outer periphery of the block, and both traction performance and handling performance on snow can be improved.
The block includes a plurality of sipes, and a plurality of small blocks are defined by the plurality of sipes. In addition to the block edge effect, the sipe edge is formed by edges of a plurality of small blocks formed by the plurality of sipes. The effect can be further enhanced to improve the traction performance and handling performance on snow.
In addition, since at least one of the shapes of the small block on the tire surface is a polygon whose right angles are right angles, the block edge effect can be surely obtained regardless of the input direction from the block. it can.
In addition, at least one of the shapes of the small blocks on the tire surface is a quadrangle having right angles, so that the block edge effect can be reliably obtained.
Further, since the small blocks are formed at equal intervals in the block, and the interval is set to 3.0 mm or more and 6.0 mm or less, a sipe edge effect can be obtained together with a block edge effect.
　以上説明したように、本発明によれば、サイプエッジ効果に加え、ブロック剛性が向上するので、サイプエッジ効果に加えて、ブロックエッジ効果を好適に得ることができるので、雪上路面におけるトラクション性能とハンドリング性能との両方を向上させることができる。 As described above, according to the present invention, the block rigidity is improved in addition to the sipe edge effect, so that the block edge effect can be suitably obtained in addition to the sipe edge effect, so that the traction performance and the handling performance on the road surface on snow. Both can be improved.
　以上、本発明を実施の形態を用いて説明したが、本発明の技術的範囲は前記実施の形態に記載の範囲には限定されない。前記実施の形態に、多様な変更または改良を加えることが可能であることが当業者にも明らかである。そのような変更または改良を加えた形態も本発明の技術的範囲に含まれ得ることが、特許請求の範囲から明らかである。 As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.
　１１ トレッド、１１Ａ　タイヤセンター部、１２乃至１６　周方向溝、
１７，１８　ラグ溝、２０，２１，２３　ブロック、２４　区画線、
３１～３６　サイプ、５０　基本ブロック。 11 tread, 11A tire center portion, 12 to 16 circumferential grooves,
17, 18 lug grooves, 20, 21, 23 blocks, 24 lane markings,
31-36 sipes, 50 basic blocks.

Claims (6)

  1. 　タイヤ周方向に延びる複数の周方向溝と幅方向に延びる複数のラグ溝とを備え、前記周方向溝及びラグ溝により区画されたブロックにサイプを有するタイヤにおいて、
    前記サイプの端部が周方向溝又はラグ溝に開口又は終端し、前記サイプと前記ブロックの区画線との交点と前記ブロックの区画線との交点を境にして連続する前記区画線の一方側と、前記サイプの端部における延長線とのなす角度が垂直であり、前記区画線の他方側が前記サイプの端部における延長線上にあることを特徴とするタイヤ。     In a tire having a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lug grooves extending in the width direction, and having a sipe in a block defined by the circumferential grooves and the lug grooves,
    One end of the sipe line that opens or terminates in a circumferential groove or lug groove, and that continues from the intersection of the sipe and the block partition line and the block partition line. And an angle formed by the extension line at the end of the sipe is vertical, and the other side of the partition line is on the extension line at the end of the sipe.
  2. 　ブロックを形成するために基本形状として設定された基本ブロックにサイプを設け、
    前記サイプと前記基本ブロックの区画線とのなす角が鋭角の場合であって、
    前記サイプと鋭角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがない場合は、
    前記サイプと前記区画線との交点から前記サイプと鋭角をなす区画線側に前記サイプの延長方向と直交するように延長した直線と、前記サイプに平行かつ前記サイプと鋭角をなす区画線に接する直線との交点を頂点とし、
    前記サイプと鋭角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがある場合は、
    前記サイプと前記区画線との交点から前記サイプと鋭角をなす区画線側に前記サイプの延長方向と直交するように延長した直線と、前記サイプに隣接するサイプの延長線との交点を頂点とし、
    前記サイプと前記基本ブロックの区画線とのなす角が鈍角の場合であって、
    前記サイプと鈍角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがない場合は、
    前記サイプの延長線と、前記サイプに平行かつ前記サイプと鈍角をなす区画線に接する直線との交点を頂点とし、
    前記サイプと鈍角をなす区画線と前記サイプとの間に前記サイプに隣接するサイプがある場合は、
    前記サイプの延長線と、前記サイプに隣接するサイプと区画線との交点から前記隣接するサイプの延長方向と直交するように前記サイプ側に延長した直線との交点を頂点として前記基本ブロックを変形して形成されたブロックを備えたことを特徴とするタイヤ。     Provide sipes on the basic block set as the basic shape to form the block,
    The angle formed by the sipe and the division line of the basic block is an acute angle,
    When there is no sipe adjacent to the sipe between the sipe and the sipe that forms an acute angle with the sipe,
    A straight line extending so as to be orthogonal to the extending direction of the sipe from the intersection of the sipe and the sipe line toward the lane line that forms an acute angle with the sipe, and a tangential line that is parallel to the sipe and that forms an acute angle with the sipe Let the intersection with a straight line be the vertex,
    If there is a sipe adjacent to the sipe between the sipe and a lane marking that forms an acute angle with the sipe,
    The vertex is the intersection of a straight line extending from the intersection of the sipe and the sipe to the lane line that forms an acute angle with the sipe so as to be orthogonal to the extension direction of the sipe, and the extension line of the sipe adjacent to the sipe. ,
    The angle formed by the sipe and the block line of the basic block is an obtuse angle,
    When there is no sipe adjacent to the sipe between the sipe and the sipe that forms an obtuse angle with the sipe,
    An apex is an intersection of an extension line of the sipe and a straight line that is parallel to the sipe and touches a lane line that forms an obtuse angle with the sipe,
    If there is a sipe adjacent to the sipe between the sipe and the sipe that forms an obtuse angle with the sipe,
    The basic block is deformed with the intersection of the extension line of the sipe and the straight line extending to the sipe side from the intersection of the sipe adjacent to the sipe and the dividing line orthogonal to the extension direction of the adjacent sipe. A tire comprising a block formed as a result.
  3. 　前記ブロックは、前記サイプを複数備え、前記複数のサイプにより複数の小ブロックが画成されたことを特徴とする請求項１又は請求項２に記載のタイヤ。 The tire according to claim 1 or 2, wherein the block includes a plurality of the sipes, and a plurality of small blocks are defined by the plurality of sipes.
  4. 　前記小ブロックのタイヤ表面における形状のうち少なくとも一つは、すべての角が直角の多角形であることを特徴とする請求項３に記載のタイヤ。 4. The tire according to claim 3, wherein at least one of the shapes of the small blocks on the tire surface is a polygon having all right angles.
  5. 　前記小ブロックのタイヤ表面における形状のうち少なくとも一つは、すべての角が直角の四角形であることを特徴とする請求項３又は請求項４に記載のタイヤ。 The tire according to claim 3 or 4, wherein at least one of the shapes of the small blocks on the tire surface is a quadrangle having right angles.
  6. 　前記小ブロックは、前記ブロックに均等な間隔で形成され、前記間隔を３．０ｍｍ以上６．０ｍｍ以下に設定したことを特徴とする請求項３乃至請求項５いずれかに記載のタイヤ。
          The tire according to any one of claims 3 to 5, wherein the small blocks are formed at equal intervals in the block, and the interval is set to 3.0 mm or more and 6.0 mm or less.
PCT/JP2015/066965 2014-06-18 2015-06-12 Tire WO2015194464A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05193309A (en) * 1991-10-24 1993-08-03 Ohtsu Tire & Rubber Co Ltd :The Studless tire for automobile
JP2001001721A (en) * 1999-06-23 2001-01-09 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2014051176A (en) * 2012-09-06 2014-03-20 Bridgestone Corp Pneumatic tire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05193309A (en) * 1991-10-24 1993-08-03 Ohtsu Tire & Rubber Co Ltd :The Studless tire for automobile
JP2001001721A (en) * 1999-06-23 2001-01-09 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2014051176A (en) * 2012-09-06 2014-03-20 Bridgestone Corp Pneumatic tire

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