WO2020129471A1 - Tire - Google Patents

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Publication number
WO2020129471A1
WO2020129471A1 PCT/JP2019/044376 JP2019044376W WO2020129471A1 WO 2020129471 A1 WO2020129471 A1 WO 2020129471A1 JP 2019044376 W JP2019044376 W JP 2019044376W WO 2020129471 A1 WO2020129471 A1 WO 2020129471A1
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WO
WIPO (PCT)
Prior art keywords
segment
tire
display information
inclined surface
arithmetic mean
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PCT/JP2019/044376
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French (fr)
Japanese (ja)
Inventor
直子 石川
Original Assignee
株式会社ブリヂストン
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Publication of WO2020129471A1 publication Critical patent/WO2020129471A1/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
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof

Definitions

  • the present invention relates to a tire, and more particularly to a tire provided with a processed portion having a plurality of ridges arranged in parallel with each other in a sidewall portion.
  • an object of the present invention is to provide a tire that suppresses a reduction in the visibility of the display information formed on the sidewall portion and enhances the appearance.
  • the sidewall portion is provided with a processed portion having a plurality of ridges arranged in parallel with each other.
  • a top portion extending in the longitudinal direction of the protrusion, and a first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion,
  • a second inclined surface that inclines from the top toward the other side in the direction orthogonal to the longitudinal direction of the protrusion,
  • the first segment is characterized by having an arithmetic mean roughness Ra(M1) of 20 ⁇ m to 60 ⁇ m.
  • the tire of the present invention is In the tire in which the sidewall portion is provided with a processed portion having a plurality of protrusions arranged in parallel to each other, In each of the protrusions of the processed portion, a top portion extending in the longitudinal direction of the protrusion, and a first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion, A second inclined surface that inclines from the top toward the other side in the direction orthogonal to the longitudinal direction of the protrusion, The first inclined surface has a first segment that constitutes the first display information and a first anti-segment that does not constitute the first display information, The first segment and the first anti-segment have different arithmetic mean roughness, The first anti-segment has an arithmetic mean roughness Ra(Mz) of 20 ⁇ m to 60 ⁇ m.
  • FIG. 1 is a cross-sectional view of a tire according to an embodiment of the present invention along a tire width direction and a radial direction. It is a side view of the tire of FIG.
  • FIG. 3 is an enlarged view of a part of the region of FIG. 2. It is the perspective view which looked at the processing part provided in the sidewall part of the tire of Drawing 1 from the side of the tire to one side in the tire peripheral direction at an angle. It is the perspective view which looked at the processed part provided in the side wall part of the tire of Drawing 1 from the side of the tire diagonally to the tire peripheral direction other side.
  • FIG. 3 is a cross-sectional view taken along the tire circumferential direction of FIG. 2.
  • FIG. 1 is a partial cross-sectional view of a tire 1 according to an embodiment of the present invention.
  • FIG. 1 is a cross-sectional view of the tire 1 along the tire width direction and the tire radial direction. Note that FIG. 1 shows only one side in the tire width direction with reference to the tire equator line CL. The other side in the tire width direction based on the tire equatorial plane CL has the same configuration as the one side in the tire width direction.
  • FIG. 2 is a side view of the tire 1 according to this embodiment.
  • the internal structure of the tire can be any known internal structure, but examples are shown below.
  • the tire 1 includes a tread portion 2, a sidewall portion 3, a carcass 6, and a bead portion 7.
  • the tread portion 2 is a portion provided with a tread rubber having a tread tread surface in contact with a road surface (not shown).
  • a pattern (not shown) may be formed on the tread surface of the tread portion 2 according to the usage environment of the tire 1 (for example, a pneumatic tire) and the type of vehicle to which the tire 1 is mounted.
  • Sidewall part 3 is connected to tread part 2 and is located inside tire radial direction of tread part 2.
  • the sidewall portion 3 is a region from an outer end in the tire width direction of the tread portion 2 to an outer end in the tire radial direction of the bead portion 7 (in the case of having a bead core, an outer end in the tire radial direction of the bead core).
  • the carcass 6 forms the skeleton of the tire 1.
  • the carcass 6 is a radial structure having carcass cords (not shown) radially arranged along the tire radial direction.
  • the carcass 6 is not limited to the radial structure, and may have a bias structure in which the carcass cords are arranged so as to intersect in the tire radial direction.
  • the bead portion 7 is continuous with the sidewall portion 3 and is located inside the sidewall portion 3 in the tire radial direction.
  • the bead portion 7 has an annular bead core whose cross-sectional shape is circular in the illustrated example.
  • the carcass 6 is folded back from the tire width direction inner side to the tire width direction outer side via the bead portion 7.
  • a processed portion 4 is formed on the outer surface of the sidewall portion 3 (not shown in FIG. 1).
  • the processed portion 4 is formed in an annular shape along the tire circumferential direction. That is, the protrusion 40 described below is formed over the entire area in the tire circumferential direction.
  • the processed portion 4 has a plurality of protrusions 40 (see FIG. 3 and the like) arranged in parallel with each other.
  • the processing unit 4 for example, marks such as characters, figures, and symbols are formed.
  • each ridge 40 extends in the tire radial direction. In the example shown in FIG.
  • the processed portion 4 is continuously formed over the entire area of the sidewall portion 3 in the tire circumferential direction.
  • the processed portion 4 can also be formed on a part of the outer surface of the sidewall portion 3 in the tire circumferential direction. In that case, a plurality of processed portions 4 are formed on the outer surface of the sidewall portion. It can be formed intermittently along the tire circumferential direction.
  • the processed portion 4 is formed over substantially the entire area of the outer surface of the sidewall portion 3 in the tire radial direction (that is, the ridge 40 is formed on the outer surface of the sidewall portion 3 in the tire radial direction). It extends over almost the entire area).
  • the processed portion 4 is formed only in a part of the tire radial direction region of the outer surface of the sidewall portion 3 (that is, the protrusion 40 is the tire radial direction region of the outer surface of the sidewall portion 3). Can be extended to only a part of).
  • the processed portion 4 is formed over 80% or more of the entire outer surface of the sidewall portion 3 in the tire radial direction (that is, the protrusion 40 is formed on the sidewall portion). It is preferable that the outer surface of No. 3 extends over 80% or more of the entire area in the tire radial direction).
  • FIG. 3 is an enlarged view of a part of the region 5 of FIG. 2
  • FIG. 4 is a perspective view of the processed portion provided in the sidewall portion of the tire of FIG. 1 viewed obliquely from the side surface of the tire to one side in the tire circumferential direction.
  • 5 is a perspective view of a processed portion provided on a sidewall portion of the tire of FIG. 1 as viewed obliquely from the side surface of the tire to the other side in the tire circumferential direction.
  • FIG. 6 is a sectional view taken along the tire circumferential direction of FIG.
  • the processing section 4 has a plurality of ridges 40 arranged in parallel with each other. As shown in FIGS. 3 to 6, the processed portion 4 is formed in a serration shape. In the present embodiment, the protrusion 40 of the processed portion 4 extends along the tire radial direction, but it may extend at an angle to the tire radial direction. As shown in FIG.
  • each of the ridges 40 of the processed portion 4 has a top portion 41 extending in the longitudinal direction of the ridge 40 and one side in a direction orthogonal to the longitudinal direction of the ridge 40 from the top portion 41 (
  • the first inclined surface 42 inclined toward the tire circumferential direction one side, and the other side in the direction orthogonal to the longitudinal direction of the protrusion 40 from the top 41 (the tire circumferential direction other in the present embodiment).
  • the second inclined surface 43 is inclined toward the side).
  • a first segment 44 (three characters in the illustrated example), which is divided into a plurality of small segments and constitutes first display information, is assigned to the first inclined surface 42,
  • the arithmetic average roughness Ra(M1) of the first segment 44 is 20 ⁇ m to 60 ⁇ m.
  • the second inclined surface 43 is divided into a plurality of small segments and constitutes the second display information.
  • the second segment 45 (a part thereof is shown in the range shown in the drawing). 7 of the same figure) are assigned, and the arithmetic mean roughness Ra(M2) of the second segment is 20 ⁇ m to 60 ⁇ m, which is the same as Ra(M1) in this example. ..
  • the first display information is composed of three characters E, G, and N within the range shown in the figure
  • the second display information is a figure other than the character (in the example shown, it is rectangular in plan view).
  • the shape is a shape in which two sides in the longitudinal direction of the rectangle are concavely curved, and two sides in the lateral direction of the rectangle are convexly curved).
  • the second inclined surface 43 has the above-mentioned second display information, but it may have only the first display information formed on the first inclined surface 42.
  • the first display information and the second display information may be display information, and may be characters, figures, symbols, or the like.
  • the first display information is a character and the second display information is a graphic, and the types are different from each other.
  • the first display information and the second display information are characters, graphics, or symbols. It is also possible to use the same type of display information, such as for each other.
  • the same characters may be the same (for example, the same E, G, N), or different characters (figures, symbols, etc.) (for example, one is E, G, etc.).
  • N and the other is X, Y).
  • the first segment 44 and the second segment 45 are adjacent to the adjacent region 46 having the arithmetic average roughness Ra(A) of 1.0 ⁇ m to 15 ⁇ m.
  • the ratio Ra(A)/Ra(M1) of the arithmetic average roughness Ra(A) of the adjacent region 46 to the arithmetic average roughness Ra(M1) of the first segment 44 is 0. It is 1 to 0.4.
  • the ratio Ra(A)/Ra(M2) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M2) of the second segment 45 is also 0.1 to 0. .4.
  • the first segment 44 and the second segment 45 of the present embodiment are subjected to laser processing on the tire or the tire mold to form fine irregularities on the tire surface, and the desired arithmetic mean is obtained.
  • the roughness can be obtained.
  • the tire mold is subjected to laser processing, the fine irregularities having the desired arithmetic average roughness are transferred as the fine irregularities of the tire through a vulcanization process using the tire mold.
  • the first segment 44 and the second segment 45 thus formed, and the adjacent region 46 thereof are located on the same plane. That is, the first segment 44 and the adjacent region 46, and the second segment 45 and the adjacent region 46 are continuous on the same plane without a step or the like therebetween.
  • the first inclined surface 42 may be divided into a plurality of small segments, and the third segment, which constitutes the third display information, may be further allocated.
  • the range of the arithmetic average roughness Ra(M3) of the third segment may be the same as that of Ra(M1), but it is preferable to set the arithmetic average roughness different from that of the first segment.
  • Ra(M3) ) Is preferably 2.0 ⁇ m to 80 ⁇ m.
  • the processed portion 4 provided on the sidewall portion 3 has the first inclined surface 42 with the arithmetic mean roughness Ra (M1) of 20 ⁇ m to 60 ⁇ m.
  • First display information composed of one segment 44 is arranged.
  • the brightness of the first segment 44 is improved, and the visibility of the first display information can be improved without providing large unevenness. That is, if the arithmetic average roughness Ra(M1) is less than 20 ⁇ m, the visibility of the display information decreases, while if the arithmetic average roughness Ra(M1) exceeds 60 ⁇ m, the unevenness of the inclined surface becomes too large. As a result, the visibility of the tire as a whole is reduced.
  • the first segment 44 is adjacent to the adjacent region 46 having the arithmetic average roughness Ra(A) of 1.0 ⁇ m to 15 ⁇ m.
  • the brightness contrast between the first segment 44 and the adjacent region 46 becomes clear, and the visibility of the first display information is improved.
  • the ratio Ra(A)/Ra(M1) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M1) of the first segment 44 is 0.1. ⁇ 0.4. Thereby, the contrast of the brightness of the first segment 44 and the adjacent region 46 can be further increased, and the visibility of the first display information can be further improved.
  • the ratio Ra(A)/Ra(M2) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M2) of the second segment 45 is 0. Since it is 1 to 0.4, it is possible to further enhance the contrast between the second segment 45 and the adjacent region 46 and further improve the visibility of the second display information.
  • the first inclined surface 42 and the adjacent area 46 are located on the same plane. As a result, it is possible to suppress a reduction in the visibility of the display information due to a step or the like between the first segment and the adjacent region. Specifically, it is possible to prevent a shadow from being generated due to a step or a design shift, thereby enabling a clear and precise design.
  • the second inclined surface 43 is further provided with the second display information constituted by the second segment 45.
  • the viewer can visually recognize the first display information when viewed from one side in the tire circumferential direction and the second display information when viewed from the other side in the tire circumferential direction. Since the display information changes depending on the direction in which the tire is viewed, the appearance of the tire can be improved.
  • the first display information is a character and the second display information is a figure other than a character in the processing unit 4, so that the change in the appearance due to the change in the viewing direction is noticeably noticed by the viewer. be able to.
  • the first inclined surface 41 is further allocated with a third segment which is divided into a plurality of small segments and constitutes the third display information.
  • the third segment preferably has an arithmetic mean roughness R(M3) different from that of the first segment 44.
  • R(M3) arithmetic mean roughness
  • the first display information and the third display information can be distinguished and visually recognized, and a more complicated expression can be made. Therefore, the width of the design can be expanded and the appearance can be improved.
  • the arithmetic average roughness of the third segment may be the same as the arithmetic average roughness of the first segment 44.
  • the arithmetic mean roughness Ra(M1) of the first segment 44 is more preferably 30 ⁇ m to 50 ⁇ m.
  • the thickness By setting the thickness to 30 ⁇ m or more, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved.
  • the thickness by setting the thickness to 50 ⁇ m or less, the size of the unevenness can be suppressed and the uniformity of the appearance can be improved. This is because it can be improved.
  • the arithmetic mean roughness Ra(M2) of the second segment 45 is more preferably 30 ⁇ m to 50 ⁇ m. By setting the thickness to 30 ⁇ m or more, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved.
  • the thickness is 50 ⁇ m or less, the size of the unevenness can be suppressed and the uniformity of the appearance can be improved. This is because it can be improved.
  • the ratio Ra(A)/Ra(M1) of the arithmetic average roughness Ra(A) of the adjacent region 46 to the arithmetic average roughness Ra(M1) of the first segment 44 is 0.1 to. It is more preferably 0.26. By setting it to 0.26 or less, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved.
  • the ratio Ra(A)/Ra(M2) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M2) of the second segment 45 is 0.1. It is more preferably about 0.26. By setting it to 0.26 or less, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved.
  • each protrusion 40 is not particularly limited, but is preferably 0.30 to 0.50 mm, for example.
  • the width w1 of the bottom of each ridge 40 is not particularly limited, but is preferably, for example, 0.60 to 0.85 mm, and the width w2 of the top 41 is particularly preferably. Although not limited, it is preferably 0.01 to 0.03 mm, for example.
  • the pitch width w3 between the ridges 40 is not particularly limited, but is preferably 0.60 to 0.85 mm, for example. Further, as shown in FIG.
  • the inclination angles of the first inclined surface 42 and the second inclined surface 43 with respect to the height direction of the protrusion 40 are preferably 40° to 50°, respectively, and are 45°. Is most preferred.
  • the bottoms are not spaced, but the bottoms may be spaced.
  • each protrusion of the processed portion has a top portion extending in a longitudinal direction of the protrusion.
  • the first inclined surface has a first segment that constitutes the first display information and a first anti-segment that does not constitute the first display information, and the first segment and the first anti-segment have different arithmetic average coarseness.
  • the first anti-segment has an arithmetic mean roughness Ra(Mz) of 20 ⁇ m to 60 ⁇ m.
  • the ridge 40 of the tire can be formed by transferring the shape of the recess using a tire mold having a recess having a shape corresponding to the ridge 40.
  • the tire mold according to the present embodiment has, in the sidewall formation portion, a processed portion formation portion formed in an annular shape along the circumferential direction of the tire mold.
  • the processed portion forming portion has a plurality of recesses arranged parallel to each other (along the circumferential direction), and the plurality of recesses extend in the radial direction of the tire mold.
  • Each concave portion of the processed portion forming portion is inclined toward the bottom portion extending in the longitudinal direction of the concave portion and one side (in this example, one side in the circumferential direction) orthogonal to the longitudinal direction of the concave portion from the bottom portion.
  • a second inclined surface forming portion that inclines toward the other side (the other side in the circumferential direction in the present embodiment) in the direction orthogonal to the longitudinal direction of the recess from the top portion.
  • the shape of the recess may be, for example, a structure corresponding to the structure shown in FIG. 6 regarding the shape of the protrusion 40, and the depth of each recess is not particularly limited, but is, for example, 0.30. It is preferable to set it to 0.50 mm.
  • the width of the top of each recess is not particularly limited, but is preferably, for example, 0.60 to 0.85 mm, and the width of the bottom is not particularly limited, but is, for example, 0.01 to 0. It is preferably set to 03 mm.
  • the pitch width between the recesses is not particularly limited, but is preferably 0.60 to 0.85 mm, for example.
  • the inclination angles of the first inclined surface forming portion and the second inclined surface forming portion with respect to the depth direction of the concave portion are, for example, preferably 40° to 50°, and most preferably 45°, respectively. It should be noted that the concave portion may have a triangular cross section, and thus the bottom portion may have no width.
  • the processed portion forming portion is continuously formed over the entire circumferential direction of the sidewall portion forming portion. That is, the concave portion is formed over the entire area in the circumferential direction.
  • the processed portion forming portion can be formed on a part of the outer surface of the sidewall portion forming portion in the circumferential direction, and in that case, a plurality of processed portion forming portions of the sidewall portion forming portion are formed. It can be formed on the outer surface intermittently along the circumferential direction.
  • the processed portion forming portion is formed over substantially the entire radial direction of the outer surface of the sidewall portion forming portion (that is, the recess extends over substantially the entire radial direction of the outer surface of the sidewall portion forming portion. ).
  • the processed portion forming portion is formed only in a part of the radial region of the outer surface of the sidewall portion forming portion (that is, the recess is formed in the radial region of the outer surface of the sidewall portion forming portion. It can be extended to only a part).
  • the processed portion forming portion is formed over 80% or more of the radial entire area of the outer surface of the sidewall portion forming portion (that is, the concave portion is formed by the sidewall portion). It is preferable that the outer surface of the part extends over 80% or more of the entire area in the radial direction).
  • the recesses may be transferred to the ridges 40 through the vulcanization process using the tire mold, and then the laser processing may be performed on the ridges 40.
  • the tire mold subjected to the laser processing in this case will be described below.
  • the first inclined surface forming portion has a first segment forming portion (corresponding to three characters in the illustrated example) which is divided into a plurality of small segment forming portions and constitutes a first display information forming portion.
  • the arithmetic mean roughness Ra (M1m) of the first segment forming portion is 20 ⁇ m to 60 ⁇ m.
  • a second segment forming portion (in this example, a figure corresponding to FIG. 5) that is divided into a plurality of small segment forming portions and constitutes a second display information forming portion is provided in the second inclined surface forming portion.
  • the second segment forming portion has an arithmetic average roughness Ra (M2m) of 20 ⁇ m to 60 ⁇ m, which is the same as Ra (M1m) in this example.
  • the first segment forming portion and the second segment forming portion are adjacent to the adjacent area forming portion having an arithmetic average roughness Ra(Am) of 1.0 ⁇ m to 15 ⁇ m. Further, in this example, the first inclined surface forming portion and its adjacent area forming portion are located on the same plane.
  • the ratio Ra(Am)/Ra(M1m) of the arithmetic mean roughness Ra(Am) of the adjacent region forming portion to the arithmetic mean roughness Ra(M1m) of the first segment forming portion is 0.1 to It is 0.4.
  • the ratio Ra(Am)/Ra(M2m) of the arithmetic mean roughness Ra(Am) of the adjacent area forming part to the arithmetic mean roughness Ra(M2m) of the second segment forming part is also 0.1 to 0. It is 4.
  • the first inclined surface forming portion may be divided into a plurality of small segment forming portions, and the third segment forming portion forming the third display information forming portion may be further allocated.
  • the range of the arithmetic average roughness Ra (M3m) of the third segment forming portion may be the same as that of Ra (M1m), but it is preferable to set the arithmetic average roughness different from that of the first segment forming portion.
  • Ra (M3m) is preferably 2.0 ⁇ m to 80 ⁇ m.
  • the first segment forming portion more preferably has an arithmetic average roughness Ra (M1m) of 30 ⁇ m to 50 ⁇ m.
  • the second segment forming portion more preferably has an arithmetic mean roughness Ra (M2m) of 30 ⁇ m to 50 ⁇ m.
  • the ratio Ra(Am)/Ra(M1m) of the arithmetic average roughness Ra(Am) of the adjacent region forming portion to the arithmetic average roughness Ra(M1m) of the first segment forming portion is 0. It is more preferably 1 to 0.4.
  • the ratio Ra(Am)/Ra(M2m) of the arithmetic average roughness Ra(Am) of the adjacent region forming portion to the arithmetic average roughness Ra(M2m) of the second segment forming portion is 0.1 to 0. It is more preferably 0.26.
  • the sidewall forming portion is provided with a processed portion having a plurality of recesses arranged in parallel to each other, and each recess of the processed portion has a bottom extending in the longitudinal direction of the recess and a recess from the bottom.
  • the first inclined surface forming portion has a first segment forming portion and a first anti-segment forming portion, and the first segment forming portion and the first anti-segment forming portion have different arithmetic mean roughness.
  • the arithmetic mean roughness Ra(Mz) of the first anti-segment forming portion is 20 ⁇ m to 60 ⁇ m.
  • the above tire can be manufactured using the above tire mold. That is, the protrusion 40 can be formed by transferring the shape of the recess using a mold having a recess having a shape corresponding to the protrusion 40.
  • the first segment 44 and the second segment 45 (the small segments that respectively configure them) have the above arithmetic average roughness by subjecting the ridge 40 of the tire 1 to laser processing.
  • the tire mold may be laser-processed and transferred to the tire 1.
  • Tire 2 Tread part 3: Sidewall part 4: Processed part 5: Partial region of the processed part 6: Carcass 7: Bead part 40: Ridge 41: Top part 42: First slope 43: Second slope Surface 44: First segment 45: Second segment CL: Tire equatorial surface

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  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

In this tire, a processed section having a plurality of projections arranged parallel to each other is provided in a sidewall section, each projection of the processed section is provided with an apex section extending in the longitudinal direction of the projection, a first inclined surface inclined from the apex section to one side in the direction orthogonal to the longitudinal direction of the projection, and a second inclined surface inclined from the apex section to the other side in the direction orthogonal to the longitudinal direction of the projection, first segments divided into a plurality of small segments and constituting first display information are assigned to the first inclined surfaces, and the first segments have an arithmetic mean roughness Ra (M1) of 20 µm to 60 µm. Alternatively, the first inclined surfaces have first segments constituting first display information, and first anti-segments not constituting the first display information, the first segments and the first anti-segments have a different arithmetic mean roughness, and the first anti-segments have an arithmetic mean roughness Ra(Mz) of 20 µm to 60 µm.

Description

タイヤtire
　本発明は、タイヤに関するものであり、特に、サイドウォール部に互いに平行に配列された複数本の突条を有する加工部を設けたタイヤに関するものである。 The present invention relates to a tire, and more particularly to a tire provided with a processed portion having a plurality of ridges arranged in parallel with each other in a sidewall portion.
　従来、サイドウォール部に互いに平行に配列された複数本の突条を有するセレーション状に形成された加工部を設け、タイヤの外観性を高める技術が提案されている（例えば、特許文献１参照）。 BACKGROUND ART Conventionally, a technique has been proposed in which a serrated processing portion having a plurality of ridges arranged in parallel to each other is provided on a sidewall portion to enhance the appearance of a tire (see, for example, Patent Document 1). ..
　例えば、特許文献１には、サイドウォール部に互いに平行に配列された複数本の突条の第１傾斜面又は第２傾斜面にエッチング処理又はメッキ処理に基づく凹凸を転写し、表示情報を構成する技術が開示されている。 For example, in Patent Document 1, unevenness based on etching or plating is transferred to the first inclined surface or the second inclined surface of a plurality of ridges arranged in parallel with each other in the sidewall portion to form display information. Techniques for doing so are disclosed.
特開２０１７－３０５５８号公報（特許請求の範囲等）Japanese Patent Laid-Open No. 2017-30558 (claims, etc.)
　しかしながら、特許文献１に記載の技術では、表示情報に影が生じ、表示情報の視認性が低下する場合があった。また、特許文献１に記載の技術では、看者の観る角度によっては、隣り合うセグメント同士が滑らかに繋がって見えない場合もあった。また、表示情報を構成する凹凸の凹部にはごみが溜まりやすく、表示情報の視認性を損ねる虞があった。 However, in the technique described in Patent Document 1, there is a case where the display information has a shadow and the visibility of the display information is reduced. Further, in the technique described in Patent Document 1, adjacent segments may be smoothly connected and may not be seen depending on the angle viewed by the viewer. Further, dust is likely to accumulate in the concave and convex portions forming the display information, which may impair the visibility of the display information.
　そこで、本発明の目的は、サイドウォール部に形成された表示情報の視認性低下を抑制し、外観性を高めたタイヤを提供することにある。 Therefore, an object of the present invention is to provide a tire that suppresses a reduction in the visibility of the display information formed on the sidewall portion and enhances the appearance.
　本発明者が鋭意検討した結果、表示情報を構成する凹凸を微小化することにより上記課題を解決できることを見出して、本発明を完成するに至った。 As a result of diligent study by the present inventor, the inventors have found that the above problems can be solved by making the unevenness that constitutes the display information small, and have completed the present invention.
　すなわち、本発明のタイヤは、
　サイドウォール部に、互いに平行に配列された複数本の突条を有する加工部を設け、
　前記加工部の各突条に、前記突条の長手方向に延在する頂部と、該頂部から前記突条の長手方向に直交する方向の一方側に向かって傾斜する第１傾斜面と、該頂部から前記突条の長手方向に直交する方向の他方側に向かって傾斜する第２傾斜面と、を設け、
　複数の小セグメントに分割され、第１表示情報を構成する、第１セグメントが、前記第１傾斜面に割り当てられ、
　前記第１セグメントは、算術平均粗さＲａ（Ｍ１）が２０μｍ～６０μｍであることを特徴とするものである。 That is, the tire of the present invention,
The sidewall portion is provided with a processed portion having a plurality of ridges arranged in parallel with each other.
In each of the protrusions of the processed portion, a top portion extending in the longitudinal direction of the protrusion, and a first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion, A second inclined surface that inclines from the top toward the other side in the direction orthogonal to the longitudinal direction of the protrusion,
A first segment, which is divided into a plurality of small segments and constitutes first display information, is assigned to the first inclined surface,
The first segment is characterized by having an arithmetic mean roughness Ra(M1) of 20 μm to 60 μm.
　別の態様において、本発明のタイヤは、
　サイドウォール部に、互いに平行に配列された複数本の突条を有する加工部を設けたタイヤにおいて、
　前記加工部の各突条に、前記突条の長手方向に延在する頂部と、該頂部から前記突条の長手方向に直交する方向の一方側に向かって傾斜する第１傾斜面と、該頂部から前記突条の長手方向に直交する方向の他方側に向かって傾斜する第２傾斜面と、を設け、
　前記第１傾斜面が、第１表示情報を構成する第１セグメントと、第１表示情報を構成すしない第１反セグメントとを有し、
　前記第１セグメントと前記第１反セグメントとは、異なる算術平均粗さを有し、
　前記第１反セグメントは、算術平均粗さＲａ（Ｍｚ）が２０μｍ～６０μｍであることを特徴とする。 In another aspect, the tire of the present invention is
In the tire in which the sidewall portion is provided with a processed portion having a plurality of protrusions arranged in parallel to each other,
In each of the protrusions of the processed portion, a top portion extending in the longitudinal direction of the protrusion, and a first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion, A second inclined surface that inclines from the top toward the other side in the direction orthogonal to the longitudinal direction of the protrusion,
The first inclined surface has a first segment that constitutes the first display information and a first anti-segment that does not constitute the first display information,
The first segment and the first anti-segment have different arithmetic mean roughness,
The first anti-segment has an arithmetic mean roughness Ra(Mz) of 20 μm to 60 μm.
　本発明によれば、サイドウォール部に形成された表示情報の視認性低下を抑制し、外観性を高めたタイヤを提供することができる。 According to the present invention, it is possible to provide a tire that suppresses a reduction in the visibility of the display information formed on the sidewall portion and enhances the appearance.
本発明の一実施形態にかかるタイヤの、タイヤ幅方向及び径方向に沿った断面図である。1 is a cross-sectional view of a tire according to an embodiment of the present invention along a tire width direction and a radial direction. 図１のタイヤの側面図である。It is a side view of the tire of FIG. 図２の一部の領域の拡大図である。FIG. 3 is an enlarged view of a part of the region of FIG. 2. 図１のタイヤのサイドウォール部に設けた加工部を、タイヤの側面からタイヤ周方向一方側に斜めに見た斜視図である。It is the perspective view which looked at the processing part provided in the sidewall part of the tire of Drawing 1 from the side of the tire to one side in the tire peripheral direction at an angle. 図１のタイヤのサイドウォール部に設けた加工部を、タイヤの側面からタイヤ周方向他方側に斜めに見た斜視図である。It is the perspective view which looked at the processed part provided in the side wall part of the tire of Drawing 1 from the side of the tire diagonally to the tire peripheral direction other side. 図２のタイヤ周方向に沿った断面図である。FIG. 3 is a cross-sectional view taken along the tire circumferential direction of FIG. 2.
　以下、本発明の実施形態について、図面を参照して詳細に例示説明する。
（１）タイヤの全体概略構成
　図１は、本発明の一実施形態に係るタイヤ１の一部断面図である。具体的には、図１は、タイヤ１のタイヤ幅方向及びタイヤ径方向に沿った断面図である。なお、図１は、タイヤ赤道線ＣＬを基準としたタイヤ幅方向一方側のみを示す。なお、タイヤ赤道面ＣＬを基準としたタイヤ幅方向他方側についても、タイヤ幅方向一方側と同様の構成である。図２は、本実施形態に係るタイヤ１の側面図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(1) Overall Schematic Configuration of Tire FIG. 1 is a partial cross-sectional view of a tire 1 according to an embodiment of the present invention. Specifically, FIG. 1 is a cross-sectional view of the tire 1 along the tire width direction and the tire radial direction. Note that FIG. 1 shows only one side in the tire width direction with reference to the tire equator line CL. The other side in the tire width direction based on the tire equatorial plane CL has the same configuration as the one side in the tire width direction. FIG. 2 is a side view of the tire 1 according to this embodiment.
　本発明においては、タイヤの内部構造は、任意の既知のものとすることができるが、以下に例を示す。
　図１、図２に示すように、タイヤ１は、トレッド部２、サイドウォール部３、カーカス６、及びビード部７を備える。 In the present invention, the internal structure of the tire can be any known internal structure, but examples are shown below.
As shown in FIGS. 1 and 2, the tire 1 includes a tread portion 2, a sidewall portion 3, a carcass 6, and a bead portion 7.
　トレッド部２は、路面（不図示）に接するトレッド踏面を有する、トレッドゴムを備える部分である。トレッド部２の踏面には、タイヤ１（例えば空気入りタイヤ）の使用環境や装着される車両の種別に応じたパターン（不図示）が形成されてもよい。 The tread portion 2 is a portion provided with a tread rubber having a tread tread surface in contact with a road surface (not shown). A pattern (not shown) may be formed on the tread surface of the tread portion 2 according to the usage environment of the tire 1 (for example, a pneumatic tire) and the type of vehicle to which the tire 1 is mounted.
　サイドウォール部３は、トレッド部２に連なり、トレッド部２のタイヤ径方向内側に位置する。サイドウォール部３は、トレッド部２のタイヤ幅方向外側端からビード部７のタイヤ径方向外側端（ビードコアを有する場合は、ビードコアのタイヤ径方向外側端）までの領域である。 Sidewall part 3 is connected to tread part 2 and is located inside tire radial direction of tread part 2. The sidewall portion 3 is a region from an outer end in the tire width direction of the tread portion 2 to an outer end in the tire radial direction of the bead portion 7 (in the case of having a bead core, an outer end in the tire radial direction of the bead core).
　カーカス６は、タイヤ１の骨格を形成する。カーカス６は、タイヤ径方向に沿って放射状に配置されたカーカスコード（不図示）を有するラジアル構造である。但し、カーカス６は、ラジアル構造に限定されず、カーカスコードがタイヤ径方向に交錯するように配置されたバイアス構造でも良い。 The carcass 6 forms the skeleton of the tire 1. The carcass 6 is a radial structure having carcass cords (not shown) radially arranged along the tire radial direction. However, the carcass 6 is not limited to the radial structure, and may have a bias structure in which the carcass cords are arranged so as to intersect in the tire radial direction.
　ビード部７は、サイドウォール部３に連なり、サイドウォール部３のタイヤ径方向内側に位置する。ビード部７は、環状の、図示例では断面形状が円形状のビードコアを有している。そして、カーカス６は、ビード部７を介してタイヤ幅方向内側からタイヤ幅方向外側に折り返されている。 The bead portion 7 is continuous with the sidewall portion 3 and is located inside the sidewall portion 3 in the tire radial direction. The bead portion 7 has an annular bead core whose cross-sectional shape is circular in the illustrated example. The carcass 6 is folded back from the tire width direction inner side to the tire width direction outer side via the bead portion 7.
（２）サイドウォール部３の加工部４
　図２に示すように、サイドウォール部３の外表面に、加工部４が形成されている（なお、図１では図示を省略している）。加工部４は、タイヤ周方向に沿って、円環状に形成されている。すなわち、後述の突条４０は、タイヤ周方向の全域にわたって形成されている。加工部４の詳細は後述するが、加工部４は、互いに平行に配列された複数本の突条４０（図３等参照）を有している。加工部４には、例えば、文字、図形、記号等の標章が形成される。後述するように、本実施形態においては、各突条４０は、タイヤ径方向に延在している。
　図２に示す例では、加工部４は、サイドウォール部３のタイヤ周方向全域にわたって連続的に形成されている。一方で、本発明では、加工部４は、サイドウォール部３の外表面のタイヤ周方向の一部に形成することもでき、その場合、複数の加工部４をサイドウォール部の外表面に、タイヤ周方向に沿って断続的に形成することができる。
　また、図２に示す例では、加工部４は、サイドウォール部３の外表面のタイヤ径方向略全域にわたって形成されている（すなわち、突条４０がサイドウォール部３の外表面のタイヤ径方向略全域にわたって延在している）。一方で、本発明では、加工部４は、サイドウォール部３の外表面のタイヤ径方向領域の一部にのみ形成する（すなわち、突条４０がサイドウォール部３の外表面のタイヤ径方向領域の一部のみに延在する）こともできる。この場合、視認性を向上させるために、加工部４は、サイドウォール部３の外表面のタイヤ径方向全域の８０％以上の領域にわたって形成されていること（すなわち、突条４０がサイドウォール部３の外表面のタイヤ径方向全域の８０％以上の領域にわたって延在していること）が好ましい。 (2) Processing part 4 of sidewall part 3
As shown in FIG. 2, a processed portion 4 is formed on the outer surface of the sidewall portion 3 (not shown in FIG. 1). The processed portion 4 is formed in an annular shape along the tire circumferential direction. That is, the protrusion 40 described below is formed over the entire area in the tire circumferential direction. Although details of the processed portion 4 will be described later, the processed portion 4 has a plurality of protrusions 40 (see FIG. 3 and the like) arranged in parallel with each other. In the processing unit 4, for example, marks such as characters, figures, and symbols are formed. As will be described later, in the present embodiment, each ridge 40 extends in the tire radial direction.
In the example shown in FIG. 2, the processed portion 4 is continuously formed over the entire area of the sidewall portion 3 in the tire circumferential direction. On the other hand, in the present invention, the processed portion 4 can also be formed on a part of the outer surface of the sidewall portion 3 in the tire circumferential direction. In that case, a plurality of processed portions 4 are formed on the outer surface of the sidewall portion. It can be formed intermittently along the tire circumferential direction.
Further, in the example shown in FIG. 2, the processed portion 4 is formed over substantially the entire area of the outer surface of the sidewall portion 3 in the tire radial direction (that is, the ridge 40 is formed on the outer surface of the sidewall portion 3 in the tire radial direction). It extends over almost the entire area). On the other hand, in the present invention, the processed portion 4 is formed only in a part of the tire radial direction region of the outer surface of the sidewall portion 3 (that is, the protrusion 40 is the tire radial direction region of the outer surface of the sidewall portion 3). Can be extended to only a part of). In this case, in order to improve the visibility, the processed portion 4 is formed over 80% or more of the entire outer surface of the sidewall portion 3 in the tire radial direction (that is, the protrusion 40 is formed on the sidewall portion). It is preferable that the outer surface of No. 3 extends over 80% or more of the entire area in the tire radial direction).
　図２の説明においては、加工部４（特に突条４０）の詳細は省略していたので、次に、図３～６を参照して、図２に示す加工部４のタイヤ周方向及びタイヤ径方向の一部の領域（図２に示す領域５）を用いて、加工部４（特に突条４０）の詳細について説明する。
　図３は、図２の一部の領域５の拡大図であり、図４は、図１のタイヤのサイドウォール部に設けた加工部を、タイヤの側面からタイヤ周方向一方側に斜めに見た斜視図であり、図５は、図１のタイヤのサイドウォール部に設けた加工部を、タイヤの側面からタイヤ周方向他方側に斜めに見た斜視図である。図６は、図２のタイヤ周方向に沿った断面図である。 In the description of FIG. 2, the details of the processed portion 4 (particularly the ridge 40) are omitted. Next, referring to FIGS. 3 to 6, the tire circumferential direction of the processed portion 4 and the tire shown in FIG. The details of the processed portion 4 (particularly the protrusion 40) will be described using a partial region in the radial direction (region 5 shown in FIG. 2).
FIG. 3 is an enlarged view of a part of the region 5 of FIG. 2, and FIG. 4 is a perspective view of the processed portion provided in the sidewall portion of the tire of FIG. 1 viewed obliquely from the side surface of the tire to one side in the tire circumferential direction. 5 is a perspective view of a processed portion provided on a sidewall portion of the tire of FIG. 1 as viewed obliquely from the side surface of the tire to the other side in the tire circumferential direction. FIG. 6 is a sectional view taken along the tire circumferential direction of FIG.
　図３～図６に示すように、加工部４は、互いに平行に配列された複数本の突条４０を有する。図３～図６に示すように、加工部４は、セレーション状に形成されている。本実施形態では、加工部４の突条４０は、タイヤ径方向に沿って延びているが、タイヤ径方向に対して傾斜して延びていても良い。加工部４の各突条４０は、図６に示すように、該突条４０の長手方向に延在する頂部４１と、該頂部４１から突条４０の長手方向に直交する方向の一方側（本実施形態では、タイヤ周方向一方側）に向かって傾斜する第１傾斜面４２と、該頂部４１から突条４０の長手方向に直交する方向の他方側（本実施形態では、タイヤ周方向他方側）に向かって傾斜する第２傾斜面４３とを有している。本実施形態では、図６に示すように、頂部４１は、幅ｗ２を有しているが、本発明では、突条４０が断面三角形状であり、従って頂部４１が幅を有しない（ｗ２＝０）ものとすることもできる。 As shown in FIGS. 3 to 6, the processing section 4 has a plurality of ridges 40 arranged in parallel with each other. As shown in FIGS. 3 to 6, the processed portion 4 is formed in a serration shape. In the present embodiment, the protrusion 40 of the processed portion 4 extends along the tire radial direction, but it may extend at an angle to the tire radial direction. As shown in FIG. 6, each of the ridges 40 of the processed portion 4 has a top portion 41 extending in the longitudinal direction of the ridge 40 and one side in a direction orthogonal to the longitudinal direction of the ridge 40 from the top portion 41 ( In the present embodiment, the first inclined surface 42 inclined toward the tire circumferential direction one side, and the other side in the direction orthogonal to the longitudinal direction of the protrusion 40 from the top 41 (the tire circumferential direction other in the present embodiment). The second inclined surface 43 is inclined toward the side). In the present embodiment, as shown in FIG. 6, the top portion 41 has a width w2, but in the present invention, the ridge 40 has a triangular cross section, and therefore the top portion 41 has no width (w2= 0) can also be used.
　図４に示すように、第１傾斜面４２には、複数の小セグメントに分割され、第１表示情報を構成する、第１セグメント４４（図示例では３個の文字）が割り当てられており、該第１セグメント４４の算術平均粗さＲａ（Ｍ１）は、２０μｍ～６０μｍである。同様に、図５に示すように、第２傾斜面４３には、複数の小セグメントに分割され、第２表示情報を構成する、第２セグメント４５（図示の範囲では、その一部が示されているものも含めて７つの同じ図形）が割り当てられており、該第２セグメントの算術平均粗さＲａ（Ｍ２）は、２０μｍ～６０μｍであり、この例では、Ｒａ（Ｍ１）と同じである。本実施形態では、第１表示情報は、図示の範囲で、Ｅ，Ｇ，Ｎの３個の文字からなり、また、第２表示情報は、文字以外の図形（図示例では、平面視で矩形状であり、該矩形の長手方向の２つの辺が凹に湾曲しており、該矩形の短手方向の２つの辺が凸に湾曲している図形）である。なお、本実施形態では、第２傾斜面４３に上記の第２表示情報を有しているが、第１傾斜面４２に形成された第１表示情報のみを有していても良い。また、第１表示情報及び第２表示情報は、表示情報であれば良く、文字、図形、記号等のいずれでもよい。また、本実施形態では、第１表示情報を文字とし、第２表示情報を図形として、互いに種類を異ならせているが、第１表示情報及び第２表示情報は、文字同士、図形同士、記号同士等、同じ種類の表示情報とすることもできる。また、その場合、同じ文字（図形、記号等）同士であっても良く（例えば同じＥ，Ｇ，Ｎ）、異なる文字（図形、記号等）であっても良い（例えば、一方がＥ，Ｇ，Ｎで他方がＸ，Ｙ）。 As shown in FIG. 4, a first segment 44 (three characters in the illustrated example), which is divided into a plurality of small segments and constitutes first display information, is assigned to the first inclined surface 42, The arithmetic average roughness Ra(M1) of the first segment 44 is 20 μm to 60 μm. Similarly, as shown in FIG. 5, the second inclined surface 43 is divided into a plurality of small segments and constitutes the second display information. The second segment 45 (a part thereof is shown in the range shown in the drawing). 7 of the same figure) are assigned, and the arithmetic mean roughness Ra(M2) of the second segment is 20 μm to 60 μm, which is the same as Ra(M1) in this example. .. In the present embodiment, the first display information is composed of three characters E, G, and N within the range shown in the figure, and the second display information is a figure other than the character (in the example shown, it is rectangular in plan view). The shape is a shape in which two sides in the longitudinal direction of the rectangle are concavely curved, and two sides in the lateral direction of the rectangle are convexly curved). In the present embodiment, the second inclined surface 43 has the above-mentioned second display information, but it may have only the first display information formed on the first inclined surface 42. The first display information and the second display information may be display information, and may be characters, figures, symbols, or the like. In addition, in the present embodiment, the first display information is a character and the second display information is a graphic, and the types are different from each other. However, the first display information and the second display information are characters, graphics, or symbols. It is also possible to use the same type of display information, such as for each other. In that case, the same characters (figures, symbols, etc.) may be the same (for example, the same E, G, N), or different characters (figures, symbols, etc.) (for example, one is E, G, etc.). , N and the other is X, Y).
　また、図３～図６に示すように、第１セグメント４４及び第２セグメント４５は、算術平均粗さＲａ（Ａ）が１．０μｍ～１５μｍである隣接領域４６に隣接している。
　ここで、本実施形態では、第１セグメント４４の算術平均粗さＲａ（Ｍ１）に対する、隣接領域４６の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ１）は、０．１～０．４である。本実施形態では、第２セグメント４５の算術平均粗さＲａ（Ｍ２）に対する、隣接領域４６の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ２）も、０．１～０．４である。 Further, as shown in FIGS. 3 to 6, the first segment 44 and the second segment 45 are adjacent to the adjacent region 46 having the arithmetic average roughness Ra(A) of 1.0 μm to 15 μm.
Here, in the present embodiment, the ratio Ra(A)/Ra(M1) of the arithmetic average roughness Ra(A) of the adjacent region 46 to the arithmetic average roughness Ra(M1) of the first segment 44 is 0. It is 1 to 0.4. In the present embodiment, the ratio Ra(A)/Ra(M2) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M2) of the second segment 45 is also 0.1 to 0. .4.
　本実施形態の第１セグメント４４及び第２セグメント４５（をそれぞれ構成する小セグメント）は、タイヤ又はタイヤモールドにレーザー加工を施すことにより、タイヤ表面に微細な凹凸を形成して所期の算術平均粗さを得ることができる。タイヤモールドにレーザー加工を施した場合は、該タイヤモールドを用いた加硫工程を経て、所期の算術平均粗さを有する微細な凹凸がタイヤの微細な凹凸として転写される。
　このように形成された第１セグメント４４及び第２セグメント４５と、その隣接領域４６とは、同一面上に位置する。すなわち、第１セグメント４４と隣接領域４６、及び第２セグメント４５と隣接領域４６は、それぞれ、互いに段差等を介さずに同一面上で連なっている。 The first segment 44 and the second segment 45 of the present embodiment (the small segments constituting each of them) are subjected to laser processing on the tire or the tire mold to form fine irregularities on the tire surface, and the desired arithmetic mean is obtained. The roughness can be obtained. When the tire mold is subjected to laser processing, the fine irregularities having the desired arithmetic average roughness are transferred as the fine irregularities of the tire through a vulcanization process using the tire mold.
The first segment 44 and the second segment 45 thus formed, and the adjacent region 46 thereof are located on the same plane. That is, the first segment 44 and the adjacent region 46, and the second segment 45 and the adjacent region 46 are continuous on the same plane without a step or the like therebetween.
　なお、変形例として、第１傾斜面４２は、複数の小セグメントに分割され、第３表示情報を構成する、第３セグメントがさらに割り当てられても良い。第３セグメントの算術平均粗さＲａ（Ｍ３）の範囲は、Ｒａ（Ｍ１）と同様とすることもできるが、第１セグメントとは異なる算術平均粗さとすることが好ましく、この場合、Ｒａ（Ｍ３）は、２．０μｍ～８０μｍとすることが好ましい。 Note that, as a modification, the first inclined surface 42 may be divided into a plurality of small segments, and the third segment, which constitutes the third display information, may be further allocated. The range of the arithmetic average roughness Ra(M3) of the third segment may be the same as that of Ra(M1), but it is preferable to set the arithmetic average roughness different from that of the first segment. In this case, Ra(M3) ) Is preferably 2.0 μm to 80 μm.
（３）作用・効果
　以上説明したように、本実施形態では、サイドウォール部３に設けた加工部４は、第１傾斜面４２に、算術平均粗さＲａ（Ｍ１）が２０μｍ～６０μｍの第１セグメント４４により構成された第１表示情報が配されている。これにより、第１セグメント４４の明度が向上し、大きな凹凸を設けることなく、第１表示情報の視認性を向上させることができる。すなわち、算術平均粗さＲａ（Ｍ１）が２０μｍ未満だと表示情報の視認性が低下してしまい、一方で、算術平均粗さＲａ（Ｍ１）が６０μｍ超だと傾斜面の凹凸が大きくなりすぎてタイヤ全体としての視認性が低下してしまう。 (3) Operation/Effect As described above, in the present embodiment, the processed portion 4 provided on the sidewall portion 3 has the first inclined surface 42 with the arithmetic mean roughness Ra (M1) of 20 μm to 60 μm. First display information composed of one segment 44 is arranged. Thereby, the brightness of the first segment 44 is improved, and the visibility of the first display information can be improved without providing large unevenness. That is, if the arithmetic average roughness Ra(M1) is less than 20 μm, the visibility of the display information decreases, while if the arithmetic average roughness Ra(M1) exceeds 60 μm, the unevenness of the inclined surface becomes too large. As a result, the visibility of the tire as a whole is reduced.
　また、本実施形態では、第１セグメント４４は、算術平均粗さＲａ（Ａ）が１．０μｍ～１５μｍの隣接領域４６に隣接する。これにより、第１セグメント４４とその隣接領域４６との明度のコントラストが明確になり、第１表示情報の視認性が向上する。さらに、本実施形態では、第１セグメント４４の算術平均粗さＲａ（Ｍ１）に対する、隣接領域４６の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ１）が、０．１～０．４である。これにより、第１セグメント４４と隣接領域４６の明度のコントラストをより高め、第１表示情報の視認性をより向上させることができる。同様に、本実施形態では、第２セグメント４５の算術平均粗さＲａ（Ｍ２）に対する、隣接領域４６の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ２）が、０．１～０．４であるため、第２セグメント４５と隣接領域４６のコントラストをより高め、第２表示情報の視認性をより向上させることもできる。 Further, in the present embodiment, the first segment 44 is adjacent to the adjacent region 46 having the arithmetic average roughness Ra(A) of 1.0 μm to 15 μm. Thereby, the brightness contrast between the first segment 44 and the adjacent region 46 becomes clear, and the visibility of the first display information is improved. Further, in the present embodiment, the ratio Ra(A)/Ra(M1) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M1) of the first segment 44 is 0.1. ~0.4. Thereby, the contrast of the brightness of the first segment 44 and the adjacent region 46 can be further increased, and the visibility of the first display information can be further improved. Similarly, in the present embodiment, the ratio Ra(A)/Ra(M2) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M2) of the second segment 45 is 0. Since it is 1 to 0.4, it is possible to further enhance the contrast between the second segment 45 and the adjacent region 46 and further improve the visibility of the second display information.
　また、本実施形態では、第１傾斜面４２とその隣接領域４６とは、同一面上に位置する。これにより、第１セグメントと隣接領域との間の段差等に起因する表示情報の視認性低下を抑制することができる。具体的には、段差による影の発生やデザインのずれ等を防ぎ、明瞭且つ精微なデザインを可能とする。 Further, in the present embodiment, the first inclined surface 42 and the adjacent area 46 are located on the same plane. As a result, it is possible to suppress a reduction in the visibility of the display information due to a step or the like between the first segment and the adjacent region. Specifically, it is possible to prevent a shadow from being generated due to a step or a design shift, thereby enabling a clear and precise design.
　また、本実施形態では、第２傾斜面４３は、第２セグメント４５により構成された第２表示情報がさらに配されている。これにより、看者はタイヤ周方向一方側から見た場合に第１表示情報を、及び、タイヤ周方向他方側から見た場合に第２表示情報を、それぞれ視認することができ、看者がタイヤを観る方向に応じて表示情報が変化するため、タイヤの外観性を向上させることができる。さらに、本実施形態では、加工部４内において第１表示情報を文字、第２表示情報を文字以外の図形としたことで、観る方向の変化に伴う外観の変化を看者に顕著に感じさせることができる。 Further, in the present embodiment, the second inclined surface 43 is further provided with the second display information constituted by the second segment 45. With this, the viewer can visually recognize the first display information when viewed from one side in the tire circumferential direction and the second display information when viewed from the other side in the tire circumferential direction. Since the display information changes depending on the direction in which the tire is viewed, the appearance of the tire can be improved. Furthermore, in the present embodiment, the first display information is a character and the second display information is a figure other than a character in the processing unit 4, so that the change in the appearance due to the change in the viewing direction is noticeably noticed by the viewer. be able to.
　また、図示は省略するが、第１傾斜面４１に、複数の小セグメントに分割され、第３表示情報を構成する、第３セグメントがさらに割り当てられていることが好ましい。その場合、第３セグメントは、第１セグメント４４とは異なる算術平均粗さＲ（Ｍ３）を有することが好ましい。その場合、タイヤ周方向一方側から見た際に、第１表示情報と第３表示情報とをそれぞれ区別して視認可能になり、より複雑な表現が可能となる。そのため、デザインの幅が広がり、外観性を向上させることができる。一方で、第３セグメントの算術平均粗さを第１セグメント４４の算術平均粗さと同じとすることもできる。 Although not shown, it is preferable that the first inclined surface 41 is further allocated with a third segment which is divided into a plurality of small segments and constitutes the third display information. In that case, the third segment preferably has an arithmetic mean roughness R(M3) different from that of the first segment 44. In that case, when viewed from one side in the tire circumferential direction, the first display information and the third display information can be distinguished and visually recognized, and a more complicated expression can be made. Therefore, the width of the design can be expanded and the appearance can be improved. On the other hand, the arithmetic average roughness of the third segment may be the same as the arithmetic average roughness of the first segment 44.
　本発明では、第１セグメント４４は、算術平均粗さＲａ（Ｍ１）は、３０μｍ～５０μｍであることがより好ましい。３０μｍ以上とすることにより、隣接領域との明度の差が大きくなり、視認性をより向上させることができ、一方で、５０μｍ以下とすることにより、凹凸の大きさを抑え、外観の均一性を向上させることができるからである。
　また、本発明では、第２セグメント４５は、算術平均粗さＲａ（Ｍ２）は、３０μｍ～５０μｍであることがより好ましい。３０μｍ以上とすることにより、隣接領域との明度の差が大きくなり、視認性をより向上させることができ、一方で、５０μｍ以下とすることにより、凹凸の大きさを抑え、外観の均一性を向上させることができるからである。
　また、本発明では、第１セグメント４４の算術平均粗さＲａ（Ｍ１）に対する、隣接領域４６の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ１）は、０．１～０．２６であることがより好ましい。０．２６以下とすることにより、隣接領域との明度の差が大きくなり、視認性をより向上させることができるからである。
　同様に、本発明では、第２セグメント４５の算術平均粗さＲａ（Ｍ２）に対する、隣接領域４６の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ２）は、０．１～０．２６であることがより好ましい。０．２６以下とすることにより、隣接領域との明度の差が大きくなり、視認性をより向上させることができるからである。 In the present invention, the arithmetic mean roughness Ra(M1) of the first segment 44 is more preferably 30 μm to 50 μm. By setting the thickness to 30 μm or more, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved. On the other hand, by setting the thickness to 50 μm or less, the size of the unevenness can be suppressed and the uniformity of the appearance can be improved. This is because it can be improved.
In the present invention, the arithmetic mean roughness Ra(M2) of the second segment 45 is more preferably 30 μm to 50 μm. By setting the thickness to 30 μm or more, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved. On the other hand, by setting the thickness to 50 μm or less, the size of the unevenness can be suppressed and the uniformity of the appearance can be improved. This is because it can be improved.
Further, in the present invention, the ratio Ra(A)/Ra(M1) of the arithmetic average roughness Ra(A) of the adjacent region 46 to the arithmetic average roughness Ra(M1) of the first segment 44 is 0.1 to. It is more preferably 0.26. By setting it to 0.26 or less, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved.
Similarly, in the present invention, the ratio Ra(A)/Ra(M2) of the arithmetic mean roughness Ra(A) of the adjacent region 46 to the arithmetic mean roughness Ra(M2) of the second segment 45 is 0.1. It is more preferably about 0.26. By setting it to 0.26 or less, the difference in brightness from the adjacent region becomes large, and the visibility can be further improved.
　図６に示すように、各突条４０の高さｈは、特には限定しないが、例えば、０．３０～０．５０ｍｍとすることが好ましい。また、図６に示すように、各突条４０の底部の幅ｗ１は、特には限定しないが、例えば、０．６０～０．８５ｍｍとすることが好ましく、頂部４１の幅ｗ２は、特には限定しないが、例えば、０．０１～０．０３ｍｍとすることが好ましい。また、図６に示すように、突条４０間のピッチ幅ｗ３は、特には限定しないが、例えば、０．６０～０．８５ｍｍとすることが好ましい。
　また、図６に示すように、第１傾斜面４２及び第２傾斜面４３の突条４０の高さ方向に対する傾斜角度は、例えばそれぞれ４０°～５０とすることが好ましく、それぞれ４５°とすることが最も好ましい。
　なお、図６に示す例では、底部同士の間隔をないものとしているが、底部同士に間隔を設けても良い。 As shown in FIG. 6, the height h of each protrusion 40 is not particularly limited, but is preferably 0.30 to 0.50 mm, for example. Further, as shown in FIG. 6, the width w1 of the bottom of each ridge 40 is not particularly limited, but is preferably, for example, 0.60 to 0.85 mm, and the width w2 of the top 41 is particularly preferably. Although not limited, it is preferably 0.01 to 0.03 mm, for example. Further, as shown in FIG. 6, the pitch width w3 between the ridges 40 is not particularly limited, but is preferably 0.60 to 0.85 mm, for example.
Further, as shown in FIG. 6, the inclination angles of the first inclined surface 42 and the second inclined surface 43 with respect to the height direction of the protrusion 40 are preferably 40° to 50°, respectively, and are 45°. Is most preferred.
In addition, in the example shown in FIG. 6, the bottoms are not spaced, but the bottoms may be spaced.
　別の態様では、サイドウォール部に、互いに平行に配列された複数本の突条を有する加工部を設けたタイヤにおいて、加工部の各突条に、突条の長手方向に延在する頂部と、該頂部から突条の長手方向に直交する方向の一方側に向かって傾斜する第１傾斜面と、該頂部から突条の長手方向に直交する方向の他方側に向かって傾斜する第２傾斜面と、を設け、
第１傾斜面が、第１表示情報を構成する第１セグメントと、第１表示情報を構成しない第１反セグメントとを有し、第１セグメントと前記第１反セグメントとは、異なる算術平均粗さを有し、第１反セグメントは、算術平均粗さＲａ（Ｍｚ）が２０μｍ～６０μｍである。
　この態様では、先に示したのと明暗が反対になったコントラストが得られ、この場合も、サイドウォール部に形成された表示情報の視認性低下を抑制し、外観性を高めることができる。 In another aspect, in a tire in which a processed portion having a plurality of protrusions arranged in parallel to each other is provided in a sidewall portion, each protrusion of the processed portion has a top portion extending in a longitudinal direction of the protrusion. A first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion, and a second inclination inclined from the apex toward the other side in a direction orthogonal to the longitudinal direction of the protrusion. And a surface,
The first inclined surface has a first segment that constitutes the first display information and a first anti-segment that does not constitute the first display information, and the first segment and the first anti-segment have different arithmetic average coarseness. And the first anti-segment has an arithmetic mean roughness Ra(Mz) of 20 μm to 60 μm.
In this aspect, the contrast in which the lightness and darkness are opposite to that shown above is obtained, and in this case also, it is possible to suppress the deterioration of the visibility of the display information formed on the sidewall portion and enhance the appearance.
＜タイヤモールド＞
　次に、上記のタイヤを加硫成型することができるタイヤモールドの一例について説明する。上記のタイヤの突条４０は、該突条４０に対応する形状の凹部を有するタイヤモールドを用いて、該凹部の形状を転写することにより形成することができる。
　本実施形態のタイヤモールドは、サイドウォール形成部に、タイヤモールドの周方向に沿って、円環状に形成された、加工部形成部を有する。該加工部形成部は、（周方向に沿って）互いに平行に配列された複数個の凹部を有し、該複数個の凹部はタイヤモールドの径方向に延在している。
　上記加工部形成部の各凹部は、該凹部の長手方向に延在する底部と、該底部から凹部の長手方向に直交する方向の一方側（本例では、周方向一方側）に向かって傾斜する第１傾斜面形成部と、該頂部から凹部の長手方向に直交する方向の他方側（本実施形態では、周方向他方側）に向かって傾斜する第２傾斜面形成部とを有している。
　凹部の形状は、一例としては、図６に突条４０の形状等について示した構成に対応する構成とすることができ、各凹部の深さは、特には限定しないが、例えば、０．３０～０．５０ｍｍとすることが好ましい。また、各凹部の頂部の幅は、特には限定しないが、例えば、０．６０～０．８５ｍｍとすることが好ましく、底部の幅は、特には限定しないが、例えば、０．０１～０．０３ｍｍとすることが好ましい。また、凹部間のピッチ幅は、特には限定しないが、例えば、０．６０～０．８５ｍｍとすることが好ましい。
　また、第１傾斜面形成部及び第２傾斜面形成部の凹部の深さ方向に対する傾斜角度は、例えばそれぞれ４０°～５０とすることが好ましく、それぞれ４５°とすることが最も好ましい。なお、凹部が断面三角形状であり、従って底部が幅を有しないものとすることもできる。
　ここで、この例では、加工部形成部は、サイドウォール部形成部の周方向全域にわたって連続的に形成されている。すなわち、凹部が周方向全域にわたって形成されている。一方で、本発明では、加工部形成部は、サイドウォール部形成部の外表面の周方向の一部に形成することもでき、その場合、複数の加工部形成部をサイドウォール部形成部の外表面に、周方向に沿って断続的に形成することができる。また、加工部形成部は、サイドウォール部形成部の外表面の径方向略全域にわたって形成されている（すなわち、凹部がサイドウォール部形成部の外表面の径方向略全域にわたって延在している）。一方で、本発明では、加工部形成部は、サイドウォール部形成部の外表面の径方向領域の一部にのみ形成する（すなわち、凹部がサイドウォール部形成部の外表面の径方向領域の一部のみに延在する）こともできる。この場合、視認性を向上させるために、加工部形成部は、サイドウォール部形成部の外表面の径方向全域の８０％以上の領域にわたって形成されていること（すなわち、凹部がサイドウォール部形成部の外表面の径方向全域の８０％以上の領域にわたって延在していること）が好ましい。 <Tire mold>
Next, an example of a tire mold capable of vulcanizing and molding the above tire will be described. The ridge 40 of the tire can be formed by transferring the shape of the recess using a tire mold having a recess having a shape corresponding to the ridge 40.
The tire mold according to the present embodiment has, in the sidewall formation portion, a processed portion formation portion formed in an annular shape along the circumferential direction of the tire mold. The processed portion forming portion has a plurality of recesses arranged parallel to each other (along the circumferential direction), and the plurality of recesses extend in the radial direction of the tire mold.
Each concave portion of the processed portion forming portion is inclined toward the bottom portion extending in the longitudinal direction of the concave portion and one side (in this example, one side in the circumferential direction) orthogonal to the longitudinal direction of the concave portion from the bottom portion. And a second inclined surface forming portion that inclines toward the other side (the other side in the circumferential direction in the present embodiment) in the direction orthogonal to the longitudinal direction of the recess from the top portion. There is.
The shape of the recess may be, for example, a structure corresponding to the structure shown in FIG. 6 regarding the shape of the protrusion 40, and the depth of each recess is not particularly limited, but is, for example, 0.30. It is preferable to set it to 0.50 mm. The width of the top of each recess is not particularly limited, but is preferably, for example, 0.60 to 0.85 mm, and the width of the bottom is not particularly limited, but is, for example, 0.01 to 0. It is preferably set to 03 mm. The pitch width between the recesses is not particularly limited, but is preferably 0.60 to 0.85 mm, for example.
Further, the inclination angles of the first inclined surface forming portion and the second inclined surface forming portion with respect to the depth direction of the concave portion are, for example, preferably 40° to 50°, and most preferably 45°, respectively. It should be noted that the concave portion may have a triangular cross section, and thus the bottom portion may have no width.
Here, in this example, the processed portion forming portion is continuously formed over the entire circumferential direction of the sidewall portion forming portion. That is, the concave portion is formed over the entire area in the circumferential direction. On the other hand, in the present invention, the processed portion forming portion can be formed on a part of the outer surface of the sidewall portion forming portion in the circumferential direction, and in that case, a plurality of processed portion forming portions of the sidewall portion forming portion are formed. It can be formed on the outer surface intermittently along the circumferential direction. Further, the processed portion forming portion is formed over substantially the entire radial direction of the outer surface of the sidewall portion forming portion (that is, the recess extends over substantially the entire radial direction of the outer surface of the sidewall portion forming portion. ). On the other hand, in the present invention, the processed portion forming portion is formed only in a part of the radial region of the outer surface of the sidewall portion forming portion (that is, the recess is formed in the radial region of the outer surface of the sidewall portion forming portion. It can be extended to only a part). In this case, in order to improve the visibility, the processed portion forming portion is formed over 80% or more of the radial entire area of the outer surface of the sidewall portion forming portion (that is, the concave portion is formed by the sidewall portion). It is preferable that the outer surface of the part extends over 80% or more of the entire area in the radial direction).
　上述したように、タイヤにレーザー加工を施す場合は、上記のタイヤモールドを用いた加硫工程を経て凹部を突条４０に転写した上で、当該突条４０上にレーザー加工を施せばよい。
　一方、タイヤモールドにレーザー加工を施して、それをタイヤに転写することもできる。この場合のレーザー加工を施したタイヤモールドについて、以下説明する。
　本例では、第１傾斜面形成部には、複数の小セグメント形成部に分割され、第１表示情報形成部を構成する、第１セグメント形成部（図示例では３個の文字に対応）が割り当てられており、該第１セグメント形成部の算術平均粗さＲａ（Ｍ１ｍ）は、２０μｍ～６０μｍである。同様に、第２傾斜面形成部には、複数の小セグメント形成部に分割され、第２表示情報形成部を構成する、第２セグメント形成部（この例では、図５に対応する図形）が割り当てられており、該第２セグメント形成部の算術平均粗さＲａ（Ｍ２ｍ）は、２０μｍ～６０μｍであり、この例では、Ｒａ（Ｍ１ｍ）と同じである。 As described above, when laser processing is performed on the tire, the recesses may be transferred to the ridges 40 through the vulcanization process using the tire mold, and then the laser processing may be performed on the ridges 40.
On the other hand, it is also possible to perform laser processing on the tire mold and transfer it to the tire. The tire mold subjected to the laser processing in this case will be described below.
In the present example, the first inclined surface forming portion has a first segment forming portion (corresponding to three characters in the illustrated example) which is divided into a plurality of small segment forming portions and constitutes a first display information forming portion. The arithmetic mean roughness Ra (M1m) of the first segment forming portion is 20 μm to 60 μm. Similarly, a second segment forming portion (in this example, a figure corresponding to FIG. 5) that is divided into a plurality of small segment forming portions and constitutes a second display information forming portion is provided in the second inclined surface forming portion. The second segment forming portion has an arithmetic average roughness Ra (M2m) of 20 μm to 60 μm, which is the same as Ra (M1m) in this example.
　この例では、第１セグメント形成部及び第２セグメント形成部は、算術平均粗さＲａ（Ａｍ）が１．０μｍ～１５μｍである隣接領域形成部に隣接する。また、この例では、第１傾斜面形成部とその隣接領域形成部とは、同一面上に位置する。この例では、第１セグメント形成部の算術平均粗さＲａ（Ｍ１ｍ）に対する、隣接領域形成部の算術平均粗さＲａ（Ａｍ）の比Ｒａ（Ａｍ）／Ｒａ（Ｍ１ｍ）は、０．１～０．４である。また、第２セグメント形成部の算術平均粗さＲａ（Ｍ２ｍ）に対する、隣接領域形成部の算術平均粗さＲａ（Ａｍ）の比Ｒａ（Ａｍ）／Ｒａ（Ｍ２ｍ）も、０．１～０．４である。
　なお、変形例として、第１傾斜面形成部は、複数の小セグメント形成部に分割され、第３表示情報形成部を構成する、第３セグメント形成部がさらに割り当てられても良い。第３セグメント形成部の算術平均粗さＲａ（Ｍ３ｍ）の範囲は、Ｒａ（Ｍ１ｍ）と同様とすることもできるが、第１セグメント形成部とは異なる算術平均粗さとすることが好ましく、この場合、Ｒａ（Ｍ３ｍ）は、２．０μｍ～８０μｍとすることが好ましい。 In this example, the first segment forming portion and the second segment forming portion are adjacent to the adjacent area forming portion having an arithmetic average roughness Ra(Am) of 1.0 μm to 15 μm. Further, in this example, the first inclined surface forming portion and its adjacent area forming portion are located on the same plane. In this example, the ratio Ra(Am)/Ra(M1m) of the arithmetic mean roughness Ra(Am) of the adjacent region forming portion to the arithmetic mean roughness Ra(M1m) of the first segment forming portion is 0.1 to It is 0.4. Further, the ratio Ra(Am)/Ra(M2m) of the arithmetic mean roughness Ra(Am) of the adjacent area forming part to the arithmetic mean roughness Ra(M2m) of the second segment forming part is also 0.1 to 0. It is 4.
As a modification, the first inclined surface forming portion may be divided into a plurality of small segment forming portions, and the third segment forming portion forming the third display information forming portion may be further allocated. The range of the arithmetic average roughness Ra (M3m) of the third segment forming portion may be the same as that of Ra (M1m), but it is preferable to set the arithmetic average roughness different from that of the first segment forming portion. , Ra (M3m) is preferably 2.0 μm to 80 μm.
　ここで、第１セグメント形成部は、算術平均粗さＲａ（Ｍ１ｍ）が、３０μｍ～５０μｍであることがより好ましい。また、第２セグメント形成部は、算術平均粗さＲａ（Ｍ２ｍ）が、３０μｍ～５０μｍであることがより好ましい。また、本例では、第１セグメント形成部の算術平均粗さＲａ（Ｍ１ｍ）に対する、隣接領域形成部の算術平均粗さＲａ（Ａｍ）の比Ｒａ（Ａｍ）／Ｒａ（Ｍ１ｍ）は、０．１～０．４であることがより好ましい。同様に、第２セグメント形成部の算術平均粗さＲａ（Ｍ２ｍ）に対する、隣接領域形成部の算術平均粗さＲａ（Ａｍ）の比Ｒａ（Ａｍ）／Ｒａ（Ｍ２ｍ）は、０．１～０．２６であることがより好ましい。
　タイヤモールドにレーザー加工等を施すことにより、以上説明したような表面性状を有するタイヤモールドを得ることができる。そして、そのタイヤモールドを用いて加硫成型されたタイヤは、上記の表面性状を得ることができ、上述の作用効果を奏することができる。 Here, the first segment forming portion more preferably has an arithmetic average roughness Ra (M1m) of 30 μm to 50 μm. Further, the second segment forming portion more preferably has an arithmetic mean roughness Ra (M2m) of 30 μm to 50 μm. In this example, the ratio Ra(Am)/Ra(M1m) of the arithmetic average roughness Ra(Am) of the adjacent region forming portion to the arithmetic average roughness Ra(M1m) of the first segment forming portion is 0. It is more preferably 1 to 0.4. Similarly, the ratio Ra(Am)/Ra(M2m) of the arithmetic average roughness Ra(Am) of the adjacent region forming portion to the arithmetic average roughness Ra(M2m) of the second segment forming portion is 0.1 to 0. It is more preferably 0.26.
By subjecting the tire mold to laser processing or the like, a tire mold having the surface texture as described above can be obtained. Then, the tire vulcanized and molded using the tire mold can obtain the above-mentioned surface texture and can exhibit the above-described operational effects.
　別の態様では、サイドウォール形成部に、互いに平行に配列された複数本の凹部を有する加工部を設け、加工部の各凹部に、凹部の長手方向に延在する底部と、該底部から凹部の長手方向に直交する方向の一方側に向かって傾斜する第１傾斜面形成部と、該底部から凹部の長手方向に直交する方向の他方側に向かって傾斜する第２傾斜面形成部と、を設け、第１傾斜面形成部が、第１セグメント形成部と第１反セグメント形成部とを有し、第１セグメント形成部と第１反セグメント形成部とは、異なる算術平均粗さを有し、第１反セグメント形成部は、算術平均粗さＲａ（Ｍｚ）が２０μｍ～６０μｍである。 In another aspect, the sidewall forming portion is provided with a processed portion having a plurality of recesses arranged in parallel to each other, and each recess of the processed portion has a bottom extending in the longitudinal direction of the recess and a recess from the bottom. A first inclined surface forming portion inclined toward one side in a direction orthogonal to the longitudinal direction, and a second inclined surface forming portion inclined from the bottom portion to the other side in a direction orthogonal to the longitudinal direction of the recess, And the first inclined surface forming portion has a first segment forming portion and a first anti-segment forming portion, and the first segment forming portion and the first anti-segment forming portion have different arithmetic mean roughness. The arithmetic mean roughness Ra(Mz) of the first anti-segment forming portion is 20 μm to 60 μm.
＜タイヤの製造方法＞
　上記のタイヤは、上記のタイヤモールドを用いて製造することができる。すなわち、突条４０は、該突条４０に対応する形状の凹部を有するモールドを用いて、該凹部の形状を転写することにより形成することができる。また、上述したように、第１セグメント４４及び第２セグメント４５（をそれぞれ構成する小セグメント）は、タイヤ１の突条４０にレーザー加工を施すことにより、上記の算術平均粗さを有するものとすることができ、あるいは、タイヤモールドにレーザー加工を施して、それをタイヤ１に転写しても良い。 <Tire manufacturing method>
The above tire can be manufactured using the above tire mold. That is, the protrusion 40 can be formed by transferring the shape of the recess using a mold having a recess having a shape corresponding to the protrusion 40. In addition, as described above, the first segment 44 and the second segment 45 (the small segments that respectively configure them) have the above arithmetic average roughness by subjecting the ridge 40 of the tire 1 to laser processing. Alternatively, the tire mold may be laser-processed and transferred to the tire 1.
１：タイヤ
２：トレッド部
３：サイドウォール部
４：加工部
５：加工部の一部の領域
６：カーカス
７：ビード部
４０：突条
４１：頂部
４２：第１傾斜面
４３：第２傾斜面
４４：第１セグメント
４５：第２セグメント
ＣＬ：タイヤ赤道面
  1: Tire 2: Tread part 3: Sidewall part 4: Processed part 5: Partial region of the processed part 6: Carcass 7: Bead part 40: Ridge 41: Top part 42: First slope 43: Second slope Surface 44: First segment 45: Second segment CL: Tire equatorial surface

Claims (7)

  1. 　サイドウォール部に、互いに平行に配列された複数本の突条を有する加工部を設けたタイヤにおいて、
    　前記加工部の各突条に、前記突条の長手方向に延在する頂部と、該頂部から前記突条の長手方向に直交する方向の一方側に向かって傾斜する第１傾斜面と、該頂部から前記突条の長手方向に直交する方向の他方側に向かって傾斜する第２傾斜面と、を設け、
    　複数の小セグメントに分割され、第１表示情報を構成する、第１セグメントが、前記第１傾斜面に割り当てられ、
    　前記第１セグメントは、算術平均粗さＲａ（Ｍ１）が２０μｍ～６０μｍであることを特徴とする、タイヤ。     In the tire in which the sidewall portion is provided with a processed portion having a plurality of protrusions arranged in parallel to each other,
    In each of the protrusions of the processed portion, a top portion extending in the longitudinal direction of the protrusion, and a first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion, A second inclined surface that inclines from the top toward the other side in the direction orthogonal to the longitudinal direction of the protrusion,
    A first segment, which is divided into a plurality of small segments and constitutes first display information, is assigned to the first inclined surface,
    The tire, wherein the first segment has an arithmetic average roughness Ra (M1) of 20 μm to 60 μm.
  2. 　前記第１セグメントは、表面の算術平均粗さＲａ（Ａ）が１．０μｍ～１５μｍである隣接領域に隣接し、
    　前記算術平均粗さＲａ（Ｍ１）は、前記算術平均粗さＲａ（Ａ）とは異なる、請求項１に記載のタイヤ。     The first segment is adjacent to an adjacent region having a surface arithmetic mean roughness Ra(A) of 1.0 μm to 15 μm,
    The tire according to claim 1, wherein the arithmetic average roughness Ra(M1) is different from the arithmetic average roughness Ra(A).
  3. 　前記第１セグメントの算術平均粗さＲａ（Ｍ１）に対する、前記隣接領域の算術平均粗さＲａ（Ａ）の比Ｒａ（Ａ）／Ｒａ（Ｍ１）が、０．１～０．４である、請求項２に記載のタイヤ。 The ratio Ra(A)/Ra(M1) of the arithmetic mean roughness Ra(A) of the adjacent region to the arithmetic mean roughness Ra(M1) of the first segment is 0.1 to 0.4. The tire according to claim 2.
  4. 　前記第１セグメントと、前記隣接領域とが、同一の面上に位置する、請求項１～３のいずれか一項に記載のタイヤ。 The tire according to any one of claims 1 to 3, wherein the first segment and the adjacent region are located on the same surface.
  5. 　前記第２傾斜面に、複数のセグメントに分割され、第２表示情報を構成する、第２セグメントが割り当てられる、請求項１～４のいずれか一項に記載のタイヤ。 The tire according to any one of claims 1 to 4, wherein the second inclined surface is divided into a plurality of segments and constitutes a second display information, and a second segment is assigned to the second inclined surface.
  6. 　前記第１傾斜面に、複数のセグメントに分割され、第３表示情報を構成する、第３セグメントがさらに割り当てられ、
    　前記第３セグメントは、前記第１セグメントとは異なる算術平均粗さＲａ（Ｍ３）を有する、請求項１～５のいずれか一項に記載のタイヤ。     A third segment, which is divided into a plurality of segments and constitutes third display information, is further allocated to the first inclined surface,
    The tire according to any one of claims 1 to 5, wherein the third segment has an arithmetic mean roughness Ra(M3) different from that of the first segment.
  7. 　サイドウォール部に、互いに平行に配列された複数本の突条を有する加工部を設けたタイヤにおいて、
    　前記加工部の各突条に、前記突条の長手方向に延在する頂部と、該頂部から前記突条の長手方向に直交する方向の一方側に向かって傾斜する第１傾斜面と、該頂部から前記突条の長手方向に直交する方向の他方側に向かって傾斜する第２傾斜面と、を設け、
    　前記第１傾斜面が、第１表示情報を構成する第１セグメントと、第１表示情報を構成すしない第１反セグメントとを有し、
    　前記第１セグメントと前記第１反セグメントとは、異なる算術平均粗さを有し、
    　前記第１反セグメントは、算術平均粗さＲａ（Ｍｚ）が２０μｍ～６０μｍであることを特徴とする、タイヤ。
          In the tire in which the sidewall portion is provided with a processed portion having a plurality of protrusions arranged in parallel to each other,
    In each of the protrusions of the processed portion, a top portion extending in the longitudinal direction of the protrusion, and a first inclined surface inclined from the top toward one side in a direction orthogonal to the longitudinal direction of the protrusion, A second inclined surface that inclines from the top toward the other side in the direction orthogonal to the longitudinal direction of the protrusion,
    The first inclined surface has a first segment that constitutes the first display information and a first anti-segment that does not constitute the first display information,
    The first segment and the first anti-segment have different arithmetic mean roughness,
    The tire characterized in that the first anti-segment has an arithmetic average roughness Ra (Mz) of 20 μm to 60 μm.
PCT/JP2019/044376 2018-12-19 2019-11-12 Tire WO2020129471A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63203406A (en) * 1987-02-19 1988-08-23 Yokohama Rubber Co Ltd:The Pneumatic tire and manufacture thereof
JPS6416407A (en) * 1987-07-10 1989-01-19 Yokohama Rubber Co Ltd Pneumatic type and molding tool for the tyre
JP2004299662A (en) * 2003-03-19 2004-10-28 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2011255803A (en) * 2010-06-10 2011-12-22 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2013071572A (en) * 2011-09-27 2013-04-22 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2016132386A (en) * 2015-01-21 2016-07-25 横浜ゴム株式会社 Pneumatic tire
WO2019004412A1 (en) * 2017-06-30 2019-01-03 コンパニー ゼネラール デ エタブリッスマン ミシュラン Pneumatic tire

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63203406A (en) * 1987-02-19 1988-08-23 Yokohama Rubber Co Ltd:The Pneumatic tire and manufacture thereof
JPS6416407A (en) * 1987-07-10 1989-01-19 Yokohama Rubber Co Ltd Pneumatic type and molding tool for the tyre
JP2004299662A (en) * 2003-03-19 2004-10-28 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2011255803A (en) * 2010-06-10 2011-12-22 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2013071572A (en) * 2011-09-27 2013-04-22 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2016132386A (en) * 2015-01-21 2016-07-25 横浜ゴム株式会社 Pneumatic tire
WO2019004412A1 (en) * 2017-06-30 2019-01-03 コンパニー ゼネラール デ エタブリッスマン ミシュラン Pneumatic tire

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