WO2017090102A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2017090102A1 WO2017090102A1 PCT/JP2015/082994 JP2015082994W WO2017090102A1 WO 2017090102 A1 WO2017090102 A1 WO 2017090102A1 JP 2015082994 W JP2015082994 W JP 2015082994W WO 2017090102 A1 WO2017090102 A1 WO 2017090102A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tire
- protrusion
- tip
- pneumatic tire
- main body
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
- B60C11/1315—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls having variable inclination angles, e.g. warped groove walls
-
- 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
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- 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
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C11/1218—Three-dimensional shape with regard to depth and extending direction
-
- 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
- B60C11/1259—Depth of the sipe
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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
-
- 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
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/02—Seating or securing beads on rims
- B60C15/024—Bead contour, e.g. lips, grooves, or ribs
- B60C15/0242—Bead contour, e.g. lips, grooves, or ribs with bead extensions located radially outside the rim flange position, e.g. rim flange protectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0346—Circumferential grooves with zigzag shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0372—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane with particular inclination angles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C2011/129—Sipe density, i.e. the distance between the sipes within the pattern
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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
- B60C13/04—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls
- B60C2013/045—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls comprising different sidewall rubber layers
Definitions
- the present invention relates to a pneumatic tire that reduces noise outside the vehicle.
- the pneumatic tire described in Patent Document 1 has a lug groove that opens to the outer side in the tire width direction on the outermost side in the tire width direction of the tread portion, and a protruding portion on the outer side in the tire width direction from the opening of the lug groove. It has.
- the protrusion is located at the position of the opening on the outer side in the tire width direction of the lug groove, so that when the vehicle equipped with the pneumatic tire is traveling, the air from the lug groove to the outer side in the tire width direction is reduced. Prevents the emission of column resonance sound. As a result, noise outside the vehicle can be reduced.
- the pneumatic tire described in Patent Document 2 includes, on the outer surface of the buttress portion, a protrusion that protrudes outward in the tire radial direction and continuously extends in the tire circumferential direction.
- the protrusions block sound emission to the outside in the tire width direction.
- the projecting part may be a source of vibration and generate noise, which may reduce the noise reduction effect outside the vehicle or may not be able to obtain the noise reduction effect outside the vehicle. There is.
- the present invention has been made in view of the above, and an object thereof is to provide a pneumatic tire capable of ensuring the effect of reducing outside noise.
- the pneumatic tire of the present invention has a lug groove that opens to the outer side in the tire width direction on the outermost side in the tire width direction of the tread portion, and the opening portion of the lug groove More tires than the groove bottom of the maximum groove depth of the lug groove in the meridional section with the rim assembled on the normal rim, filled with the normal internal pressure, and loaded with 70% of the normal load.
- the protrusion includes a protrusion main body that protrudes from the tire surface, and A tip projection extending from the tip of the projection main body through a stepped portion and having a meridional cross-sectional width narrower than that of the tip of the projection main body.
- the tip protrusion comes into contact with the road surface when the tip of the protrusion comes into contact with the road surface. Since the tip protrusion has a meridional cross-sectional width that is narrower than the tip of the protrusion main body, the rigidity resistance is small and it is difficult to become a vibration source that causes noise. As a result, it is possible to ensure the effect of reducing vehicle exterior noise.
- the tip protrusion has a maximum meridional cross-sectional width of 70% or less with respect to the minimum meridional cross-sectional width of the protrusion main body within a range of 3 mm in the protruding direction with the protrusion main body. It is formed.
- the maximum meridional cross-sectional width of the tip protrusion to 70% or less of the minimum meridional cross-sectional width of the protrusion main body, the small rigidity that the tip protrusion hardly becomes a vibration source when contacting the road surface. Can be formed into a resistor. As a result, the effect of ensuring the effect of reducing outside noise can be remarkably obtained.
- the tip protrusion is formed so that an extension height from the protrusion main body is 0.5 mm or more and 20 mm or less.
- the extension height of the tip protrusion is less than 0.5 mm, the effect of reducing the rigidity resistance is small and tends to be a vibration source. On the other hand, even if the extension height of the tip protrusion exceeds 20 mm, the effect of reducing the rigidity resistance does not change greatly. Therefore, according to this pneumatic tire, the effect of ensuring the effect of reducing outside noise can be remarkably obtained.
- the tip protrusion has a maximum meridional cross-sectional width of 1% to 50% with respect to a minimum meridional cross-sectional width of the protrusion main body.
- the maximum meridional cross-sectional width of the tip protrusion is less than 1% of the minimum meridional cross-sectional width of the protrusion main body, it is equal to the fact that there is substantially no tip protrusion, and the effect of the tip protrusion is difficult to obtain.
- the maximum meridional cross-sectional width of the tip protrusion exceeds 50% of the minimum meridional cross-sectional width of the protrusion main body, the effect of reducing the rigid resistance tends to be small and can become a vibration source. Therefore, according to this pneumatic tire, the effect of ensuring the effect of reducing outside noise can be remarkably obtained.
- the tip protrusions are intermittently arranged in the tire circumferential direction.
- the protrusion is assembled to a normal rim, filled with a normal internal pressure, and loaded with 70% of the normal load.
- the distance in the tire radial direction is 0.5 mm or more.
- the distance in the tire radial direction between the tread surface and the tip of the tip protrusion is less than 0.5 mm, when the pneumatic tire is deformed while the vehicle is running, the frequency of the protrusion contacting the road surface increases. There is a tendency that the part is often deformed. Therefore, according to this pneumatic tire, since the distance in the tire radial direction between the tread surface and the tip of the tip protrusion is 0.5 mm or more, the protrusion is less likely to be deformed. A reduction effect can be secured.
- the protrusion is assembled with a normal rim, filled with a normal internal pressure, and loaded with 70% of the normal load. Is an angle of 15 ° or less on the inner side in the tire width direction and 45 ° or less on the outer side in the tire width direction.
- the angle formed by the center straight line and the tire radial direction line exceeds 15 ° inward in the tire width direction, the protrusions easily come into contact with the tire body, and there is a possibility of causing wear or chipping at the contacted portion.
- the angle formed by the center straight line and the tire radial direction line exceeds 45 ° on the outer side in the tire width direction, the projection part moves away from the lug groove, making it difficult to obtain a sound shielding effect. Therefore, according to this pneumatic tire, the angle formed by the center straight line and the tire radial direction line is 15 ° or less on the inner side in the tire width direction and 45 ° or less on the outer side in the tire width direction.
- the sound shielding effect by the protrusions can be remarkably obtained by setting the range of ⁇ 15 ° to + 45 °.
- the direction inside and outside the vehicle is specified when the vehicle is mounted, and the protrusion is formed at least on the vehicle outer side.
- the projection can be formed at least on the outside of the vehicle so that the sound can be effectively shielded and the noise outside the vehicle is reduced. be able to.
- the pneumatic tire according to the present invention can ensure the effect of reducing outside noise.
- FIG. 1 is a meridional sectional view of a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a meridional sectional view of the pneumatic tire according to the embodiment of the present invention.
- FIG. 3 is an enlarged view of a main part of the pneumatic tire shown in FIGS. 1 and 2.
- FIG. 4 is an enlarged view of a main part of the pneumatic tire shown in FIGS. 1 and 2.
- FIG. 5 is a partial side view of the protrusion as viewed from the tire width direction.
- FIG. 6 is a plan view of a part of the protrusion shown in FIG.
- FIG. 7 is a plan view of a part of the protrusion shown in FIG.
- FIG. 8 is a plan view of a part of the protrusion shown in FIG.
- FIG. 9 is a partial side view of the protrusion as viewed from the tire width direction.
- FIG. 10 is a plan view of a part of the protrusion shown in FIG.
- FIG. 11 is a plan view of a part of the protrusion shown in FIG.
- FIG. 12 is a plan view of a part of the protrusion shown in FIG.
- FIG. 13 is a plan view of a part of the protrusion shown in FIG.
- FIG. 14 is an enlarged cross-sectional view of a main part of another example of the pneumatic tire according to the embodiment of the present invention.
- 15 is a partial perspective view of another example of the pneumatic tire shown in FIG.
- FIG. 16 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
- FIG. 17 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
- FIG. 18 is a chart showing the results of the performance test of the pneumatic tire according
- 1 and 2 are meridional sectional views of a pneumatic tire according to the present embodiment.
- the tire radial direction refers to a direction orthogonal to the rotation axis (not shown) of the pneumatic tire 1
- the tire radial direction inner side refers to the side toward the rotation axis in the tire radial direction, the tire radial direction outer side. Means the side away from the rotation axis in the tire radial direction.
- the tire circumferential direction refers to a direction around the rotation axis as a central axis.
- the tire width direction means a direction parallel to the rotation axis
- the inner side in the tire width direction means the side toward the tire equator plane (tire equator line) CL in the tire width direction
- the outer side in the tire width direction means the tire width direction.
- the tire equatorial plane CL is a plane that is orthogonal to the rotation axis of the pneumatic tire 1 and passes through the center of the tire width of the pneumatic tire 1.
- the tire width is the width in the tire width direction between the portions located outside in the tire width direction, that is, the distance between the portions farthest from the tire equatorial plane CL in the tire width direction.
- the tire equator line is a line along the tire circumferential direction of the pneumatic tire 1 on the tire equator plane CL. In the present embodiment, the same sign “CL” as that of the tire equator plane is attached to the tire equator line.
- the pneumatic tire 1 described below is configured to be substantially symmetric with respect to the tire equatorial plane CL, in the meridional sectional view (FIGS. 1 and 2), the tire equatorial plane CL is Only one central side (left side in FIGS. 1 and 2) is illustrated and only the one side is described, and description of the other side (right side in FIGS. 1 and 2) is omitted.
- the pneumatic tire 1 of the present embodiment includes a tread portion 2, shoulder portions 3 on both sides thereof, a sidewall portion 4 and a bead portion 5 that are successively continuous from the shoulder portions 3. have.
- the pneumatic tire 1 includes a carcass layer 6, a belt layer 7, a belt reinforcing layer 8, and an inner liner layer 9.
- the tread portion 2 is made of a tread rubber 2 ⁇ / b> A, exposed at the outermost side in the tire radial direction of the pneumatic tire 1, and the surface thereof is the contour of the pneumatic tire 1.
- a tread surface 21 is formed on the outer peripheral surface of the tread portion 2, that is, on the tread surface that contacts the road surface during traveling.
- the tread surface 21 is provided with a plurality of (four in this embodiment) main grooves 22 which are straight main grooves extending along the tire circumferential direction and parallel to the tire equator line CL.
- the tread surface 21 is formed with a plurality of rib-like land portions 23 extending along the tire circumferential direction by the plurality of main grooves 22.
- the main groove 22 may be formed to be bent or curved while extending along the tire circumferential direction.
- the tread surface 21 is provided with a lug groove 24 extending in a direction intersecting the main groove 22 in the land portion 23.
- the lug groove 24 is shown in the outermost land portion 23 in the tire width direction.
- the lug groove 24 may intersect the main groove 22, or at least one end of the lug groove 24 may not terminate the main groove 22 and terminate in the land portion 23.
- a block-shaped land portion in which the land portion 23 is divided into a plurality of portions in the tire circumferential direction is formed.
- the lug groove 24 may be formed to be bent or curved while extending while being inclined with respect to the tire circumferential direction.
- the shoulder portion 3 is a portion of the tread portion 2 on both outer sides in the tire width direction. That is, the shoulder portion 3 is made of the tread rubber 2A. Further, the sidewall portion 4 is exposed at the outermost side in the tire width direction of the pneumatic tire 1.
- the sidewall portion 4 is made of a side rubber 4A. As shown in FIG. 1, the side rubber 4A has an end portion on the outer side in the tire radial direction disposed on the inner side in the tire radial direction of the end portion of the tread rubber 2A, and an end portion on the inner side in the tire radial direction is a rim cushion rubber 5A described later. It is arrange
- the side rubber 4A may have an end portion on the outer side in the tire radial direction arranged outside the end portion of the tread rubber 2A in the tire radial direction.
- the bead unit 5 includes a bead core 51 and a bead filler 52.
- the bead core 51 is formed by winding a bead wire, which is a steel wire, in a ring shape.
- the bead filler 52 is a rubber material disposed in a space formed by folding the end portion in the tire width direction of the carcass layer 6 at the position of the bead core 51.
- the bead portion 5 has a rim cushion rubber 5A exposed at an outer portion that contacts a rim (not shown).
- the rim cushion rubber 5A is provided from the tire inner side of the bead part 5 to the position (side wall part 4) that covers the bead filler 52 on the tire outer side through the lower end part.
- the carcass layer 6 is configured such that each tire width direction end portion is folded back from the tire width direction inner side to the tire width direction outer side by a pair of bead cores 51 and is wound around in a toroidal shape in the tire circumferential direction. It is.
- the carcass layer 6 has a configuration that is mainly continuous in the radial direction. However, the carcass layer 6 may have a dividing portion on the inner side in the tire radial direction of the tread portion 2.
- the carcass layer 6 is formed by coating a plurality of carcass cords (not shown) arranged in parallel at an angle in the tire circumferential direction with an angle with respect to the tire circumferential direction being along the tire meridian direction.
- the carcass layer 6 is provided as at least one layer.
- the belt layer 7 has a multilayer structure in which at least two belts 71 and 72 are laminated, and is disposed on the outer side in the tire radial direction which is the outer periphery of the carcass layer 6 in the tread portion 2 and covers the carcass layer 6 in the tire circumferential direction It is.
- the belts 71 and 72 are formed by coating a plurality of cords (not shown) arranged in parallel at a predetermined angle (for example, 20 degrees to 30 degrees) with a coat rubber with respect to the tire circumferential direction. Further, the overlapping belts 71 and 72 are arranged so that the cords intersect each other.
- the belt reinforcement layer 8 is provided as necessary for reinforcement.
- the belt reinforcing layer 8 is disposed on the outer side in the tire radial direction which is the outer periphery of the belt layer 7 and covers the belt layer 7 in the tire circumferential direction.
- the belt reinforcing layer 8 is formed by coating a plurality of cords (not shown) arranged substantially parallel ( ⁇ 5 degrees) in the tire circumferential direction and in the tire width direction with a coat rubber.
- the belt reinforcing layer 8 shown in FIG. 1 and FIG. 2 is disposed so as to cover the entire belt layer 7 and laminated so as to cover the end portion of the belt layer 7 in the tire width direction.
- the configuration of the belt reinforcing layer 8 is not limited to the above, and is not clearly shown in the figure.
- the belt reinforcing layer 8 is arranged so as to cover the entire belt layer 7 with two layers, or only the end in the tire width direction of the belt layer 7. You may arrange
- the configuration of the belt reinforcing layer 8 is not clearly shown in the drawing, for example, it is arranged so as to cover the entire belt layer 7 with one layer, or to cover only the end of the belt layer 7 in the tire width direction. It may be arranged. That is, the belt reinforcing layer 8 overlaps at least the end portion in the tire width direction of the belt layer 7.
- the belt reinforcing layer 8 is provided by winding a strip-shaped strip material (for example, a width of 10 [mm]) in the tire circumferential direction.
- the inner liner layer 9 is the inner surface of the tire, that is, the inner peripheral surface of the carcass layer 6, and both end portions in the tire width direction reach the lower portions of the bead cores 51 of the pair of bead portions 5 and are formed in a toroidal shape in the tire circumferential direction. It is hung around and pasted.
- the inner liner layer 9 is for suppressing the permeation of air molecules to the outside of the tire.
- a protrusion 10 is provided on the shoulder 3.
- the protrusion 10 is provided continuously in the tire circumferential direction, and is provided on the outer side in the tire width direction from the opening of the lug groove 24 provided on the outermost side in the tire width direction of the tread portion 2.
- the protrusion 10 is formed to protrude outward in the tire radial direction.
- the protrusion 10 is the maximum of the outermost lug groove 24 in the tire width direction in the meridional section in a state in which the pneumatic tire 1 is assembled on a regular rim, filled with a regular internal pressure, and loaded with 70% of the regular load.
- the tip While extending in the tire radial direction outside the groove bottom R of the groove depth, the tip (tip of a tip protrusion 10B described later) is disposed on the tire radial direction inner side than the tread surface S of the tread portion 2.
- the lug groove 24 may be configured to partially bite into the inner surface of the protrusion 10 in the tire width direction.
- the regular rim is “standard rim” defined by JATMA, “Design Rim” defined by TRA, or “Measuring Rim” defined by ETRTO.
- the normal internal pressure is “maximum air pressure” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “INFLATION PRESSURES” defined by ETRTO.
- the normal load is “maximum load capacity” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “LOAD CAPACITY” defined by ETRTO.
- the tread surface S is a surface on which the tread surface 21 of the pneumatic tire 1 comes into contact with the road surface when the pneumatic tire 1 is assembled on a normal rim, filled with a normal internal pressure and loaded with 70% of the normal load. It is.
- the protruding portion 10 is configured integrally with the tread rubber 2 ⁇ / b> A of the tread portion 2 or the side rubber 4 ⁇ / b> A of the sidewall portion 4 described above.
- the end portion of the side rubber 4A on the outer side in the tire radial direction is disposed on the inner side in the tire radial direction of the end portion of the tread rubber 2A, and the protrusion 10 is in the tire width direction of the tread rubber 2A. Arranged with the outer end.
- the end portion of the side rubber 4A on the outer side in the tire radial direction is disposed on the outer side in the tire radial direction of the end portion of the tread rubber 2A, and the protruding portion 10 is a tire of the side rubber 4A. It arrange
- the protrusion 10 is located at the position of the opening on the outer side in the tire width direction of the lug groove 24, so that the tire width from the lug groove 24 when the vehicle equipped with the pneumatic tire 1 travels.
- the air column resonance sound to the outside in the direction is shielded to prevent emission. As a result, noise outside the vehicle can be reduced.
- FIG. 3 and 4 are enlarged views of the main part of the pneumatic tire shown in FIG. 1 and FIG. 2, and show the protrusion 10 in an enlarged manner.
- FIG. 5 is a partial side view of the protrusion as viewed from the tire width direction
- FIGS. 6 to 8 are plan views of a part of the protrusion shown in FIG.
- FIG. 9 is a partial side view of the protrusion as viewed from the tire width direction
- FIGS. 8 to 13 are plan views of a part of the protrusion shown in FIG.
- the protruding portion 10 includes a protruding portion main body 10 ⁇ / b> A and a tip protruding portion 10 ⁇ / b> B.
- the protruding portion main body 10A is a base portion that forms the protruding portion 10 and protrudes from the tire surface.
- the tip projection 10B extends from the tip 10Aa of the projection body 10A via the stepped portion 10C. Further, the tip protrusion 10B is formed to have a narrower meridian cross-sectional width than the tip 10Aa of the protrusion body 10A. Further, the tip protrusion 10B is arranged along the tire circumferential direction.
- the stepped portion 10C is a portion where the meridional cross-sectional width changes, and serves as a boundary between the protrusion main body 10A and the tip protrusion 10B.
- the tip protrusion 10B may be provided continuously in the tire circumferential direction as shown in FIGS. 5 and 6 to 8, and intermittently in the tire circumferential direction as shown in FIGS. 9 and 10 to 13. May be provided.
- the tip protrusion 10B is continuously provided in the tire circumferential direction, it is formed linearly along the tire circumferential direction as shown in FIG. 6, or bent in the tire width direction as shown in FIG. Then, it may be formed in a zigzag shape, or as shown in FIG. 8, it may be bent in the tire width direction and formed in a meandering shape.
- the tip protrusion 10B is provided intermittently in the tire circumferential direction, it is formed in a straight line along the tire circumferential direction as shown in FIG. 10, or as shown in FIG. They are provided alternately shifted in the width direction, inclined as shown in the tire width direction as shown in FIG. 12, or provided every few pieces in the tire width direction as shown in FIG. It may be.
- the tip protrusion 10B comes into contact with the road surface. Since the tip protrusion 10B has a meridional cross-sectional width that is narrower than the tip 10Aa of the protrusion main body 10A, it is difficult to become a vibration source that causes a reduction in rigidity resistance and causes noise. As a result, it is possible to ensure the effect of reducing vehicle exterior noise.
- the tip protrusion 10B has a maximum meridional cross-sectional width WB with respect to the minimum meridional cross-sectional width WA of the protrusion main body 10A within a range of 3 mm in the protruding direction including the stepped part 10C. It is formed to 70% or less.
- the protruding direction refers to the center point Pa of the thickness at the distal end 10Aa of the protrusion main body 10A and the thickness at the base end 10Ab (tread portion 2 and side
- This is the extending direction of the central straight line SL connecting the central point Pb between the points P1 and P2 intersecting the virtual profile F) of the shoulder part 3 between the wall part 4 and the wall part 4.
- the meridional section width is a dimension between surfaces where a line perpendicular to the central straight line SL intersects the surfaces of the protrusion main body 10A and the tip protrusion 10B in the meridional section.
- the tip protrusion 10B vibrates when contacting the road surface by setting the maximum meridional cross-sectional width WB of the tip protrusion 10B to 70% or less of the minimum meridional cross-sectional width WA of the protrusion main body 10A. It can be formed into a small rigid resistance that is difficult to become a source. As a result, the effect of ensuring the effect of reducing outside noise can be remarkably obtained.
- the tip protrusion 10B is preferably formed such that the height h extending from the protrusion main body 10A is 0.5 mm or more and 20 mm or less.
- the extending height h of the tip protrusion 10B is a dimension from the tip 10Aa (step 10C) of the protrusion body 10A to the most extended portion.
- the extension height h of the tip protrusion 10B is less than 0.5 mm, the effect of reducing the rigidity resistance is small and tends to be a vibration source. On the other hand, even if the extension height h of the tip protrusion 10B exceeds 20 mm, the effect of reducing the rigidity resistance does not change significantly. Therefore, according to this pneumatic tire 1, the effect of ensuring the reduction effect of outside noise can be acquired notably.
- the tip protrusion 10B is preferably formed so that the maximum meridional section width is 1% or more and 50% or less with respect to the minimum meridional section width of the protrusion main body 10A.
- the maximum meridional cross-sectional width of the tip protrusion 10B corresponds to the portion denoted by reference numeral WB
- the minimum meridional cross-sectional width of the protrusion main body 10A corresponds to the portion denoted by reference numeral WA.
- the maximum meridional cross-sectional width of the tip protrusion 10B is less than 1% of the minimum meridional cross-sectional width of the protrusion main body 10A, it is substantially equivalent to the absence of the tip protrusion 10B, and the effect of the tip protrusion 10B is difficult to obtain.
- the maximum meridional cross-sectional width of the tip protrusion 10B exceeds 50% of the minimum meridional cross-sectional width of the protrusion main body 10A, the effect of reducing the rigid resistance tends to be small and can become a vibration source. Therefore, according to this pneumatic tire 1, the effect of ensuring the reduction effect of outside noise can be acquired notably.
- the tip protrusions 10B are intermittently arranged in the tire circumferential direction as shown in FIGS.
- the protrusion part 10 is a form which protrudes from the surface of the tread part 2, and tends to produce a vulcanization failure at the time of tire shaping
- the tip protrusion 10B of the present embodiment is preferably configured as a spew formed by this vent. In order to intermittently arrange the tip protrusion 10B in the tire circumferential direction, it can be obtained by configuring the tip protrusion 10B as a spew. Further, a spew may be formed at the tip of the tip protrusion 10B.
- the protrusion main body 10A protrudes continuously from the distal end 10Aa of the protrusion main body 10A to a position higher than the base end of the distal protrusion 10B between the distal protrusions 10B arranged intermittently in the tire circumferential direction.
- the convex portion may be provided separately from the tip protrusion 10B.
- the protrusion 10 is assembled to the normal rim, filled with the normal internal pressure, and loaded with 70% of the normal load.
- the distance D in the tire radial direction between the tread surface S of the tread portion 2 and the tip of the tip protrusion 10B is preferably 0.5 mm or more.
- the projection 10 contacts the road surface or the like when the pneumatic tire 1 is deformed while the vehicle is running.
- the frequency which performs is increased, and there is a tendency that the protrusion 10 is often deformed. Therefore, by setting the distance D in the tire radial direction between the tread surface 2 of the tread portion 2 and the tip of the tip projection 10B to be 0.5 mm or more, the situation in which the projection portion 10 is deformed is reduced. Can be secured.
- the protrusion 10 is assembled with a normal rim, filled with a normal internal pressure, and loaded with 70% of the normal load.
- the angle ⁇ between the central straight line SL and the tire radial direction line L in the meridional section is preferably in the range of 15 ° or less on the inner side in the tire width direction and 45 ° or less on the outer side in the tire width direction.
- the central straight line SL is a straight line connecting the central point Pa of the thickness at the distal end 10Aa of the protrusion main body 10A and the central point Pb of the thickness (virtual profile F) at the proximal end 10Ab in the meridional section, This is along the protruding direction of the protrusion 10.
- the angle ⁇ of the tire radial direction line L is set to 0 °, if the inclination in the tire width direction inside is minus and the inclination in the tire width direction outside is plus, the range of the angle ⁇ is ⁇ 15 ° or more. + 45 ° or less.
- the angle ⁇ formed between the central straight line SL and the tire radial direction line L is less than ⁇ 15 ° (a negative angle increases), the protrusion 10 approaches the lug groove 24, and the sound shielding effect is obtained. It becomes difficult to obtain.
- the angle ⁇ formed by the center straight line SL and the tire radial direction line L exceeds + 45 ° (the positive angle increases), the protrusion 10 is likely to contact the tire body, May cause chipping. Therefore, by setting the angle ⁇ formed by the center straight line SL and the tire radial direction line L to be in the range of ⁇ 15 ° to + 45 °, the sound shielding effect by the protrusion 10 can be remarkably obtained. In order to obtain the sound shielding effect by the protrusions 10 more remarkably, it is preferable that the angle ⁇ formed by the center straight line SL and the tire radial direction line L is in the range of ⁇ 5 ° to + 30 °.
- the direction inside and outside the vehicle is specified when the vehicle is mounted, and it is preferable that the protrusion 10 is formed at least on the vehicle outer side.
- the designation of the inside / outside direction of the vehicle when the vehicle is mounted is not clearly shown in the figure, but is indicated by, for example, an index provided on the sidewall portion 4.
- the side which faces the inner side of a vehicle becomes a vehicle inner side
- the side which faces the outer side of a vehicle becomes a vehicle outer side.
- designated of a vehicle inner side and a vehicle outer side is not restricted to the case where it mounts
- the direction of the rim with respect to the inside and outside of the vehicle is determined in the tire width direction. For this reason, when the pneumatic tire 1 is assembled with a rim, the orientation with respect to the vehicle inner side and the vehicle outer side is designated in the tire width direction.
- the projection 10 is formed at least on the outside of the vehicle, so that the sound can be effectively shielded. Can be reduced.
- FIG. 14 is an enlarged cross-sectional view of a main part of another example of the pneumatic tire according to the present embodiment.
- 15 is a partial perspective view of another example of the pneumatic tire shown in FIG.
- the pneumatic tire 1 of another example according to the present embodiment has a protruding portion 10 ′ instead of the protruding portion 10 described above.
- the protrusion 10 ′ is provided continuously in the tire circumferential direction, and is provided on the outer side in the tire width direction from the opening of the lug groove 24 provided on the outermost side in the tire width direction of the tread portion 2.
- the protruding portion 10 ′ is formed to protrude outward in the tire radial direction. Further, a plurality of protrusions 10 ′ (four in this embodiment) are formed in the tire radial direction. 14 and 15, the protrusion 10 ′ is formed in a triangular shape in the meridional section, and a V-shaped groove is provided therebetween.
- test tire having a tire size of 245 / 40R18 93W was assembled to a regular rim, filled with a regular internal pressure (250 kPa), and mounted on a sedan type test vehicle having a displacement of 3000 cc.
- the evaluation method of the passing noise was evaluated by the magnitude of the passing sound measured outside the vehicle according to the tire noise test method defined in ECE R117-02 (ECE Regulation No. 117 Revision 2).
- ECE R117-02 ECE Regulation No. 117 Revision 2
- the test vehicle is run sufficiently before the noise measurement section, the engine is stopped before the section, and the maximum noise value dB (frequency in the range of 800 Hz to 1200 Hz) in the noise measurement section when coasting is run. Value) was measured at a plurality of speeds in which a speed range of ⁇ 10 km / h with respect to the reference speed was divided into eight or more at almost equal intervals, and the average was defined as vehicle outside noise.
- the maximum noise value dB is the sound measured through the A characteristic frequency correction circuit using a stationary microphone installed at a height of 7.5 m laterally from the running center line and 1.2 m from the road surface at the midpoint in the noise measurement section.
- the pressure is dB (A).
- the evaluation which made the conventional example the standard (0) is performed. This evaluation shows that the smaller the sound pressure dB with respect to the reference, the smaller the passing noise and the better the noise reduction performance outside the vehicle.
- the conventional pneumatic tire does not have a protrusion.
- the pneumatic tire of the comparative example has a protrusion having the shape shown in FIG. 3, it does not have a tip protrusion.
- the pneumatic tires of Examples 1 to 26 have the protrusions having the shape shown in FIG. 3, and are provided with a protrusion main body and a tip protrusion.
- the tip protrusions have a shape that is continuous in the tire circumferential direction shown in FIG. 6, and in Examples 19 to 26, the tip protrusions are intermittent in the tire circumferential direction shown in FIG. The shape to be arranged. It should be noted that the angle of the protrusion is negative for the inward inclination in the tire width direction and positive for the inward inclination in the tire width direction.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
2 トレッド部
3 ショルダー部
4 サイドウォール部
10 突起部
10A 突起部本体
10Aa 先端
10Ab 基端
10B 先端突起
10C 段部
24 ラグ溝
D 距離
L タイヤ径方向線
S 踏面
SL 中心直線
WA 最小子午断面幅
WB 最大子午断面幅
θ 角度
Claims (8)
- トレッド部のタイヤ幅方向最外側でタイヤ幅方向外側に開口するラグ溝を有し、前記ラグ溝の開口部よりタイヤ幅方向外側に設けられ、正規リムにリム組みし、正規内圧を充填し、正規荷重の70%を負荷した状態で、子午断面において前記ラグ溝の最大溝深さの溝底よりもタイヤ径方向外側に延在すると共に、前記トレッド部の踏面よりもタイヤ径方向内側に先端が配置される突起部を備える空気入りタイヤにおいて、
前記突起部は、タイヤ表面から突出する突起部本体と、前記突起部本体の先端から段部を介して延在して前記突起部本体の先端よりも子午断面幅が細く形成された先端突起と、を備えることを特徴とする空気入りタイヤ。 - 前記先端突起は、前記突起部本体を伴う突出方向の3mmの範囲において、前記突起部本体の最小子午断面幅に対し、最大子午断面幅が70%以下に形成されていることを特徴とする請求項1に記載の空気入りタイヤ。
- 前記先端突起は、前記突起部本体からの延在高さが0.5mm以上20mm以下に形成されていることを特徴とする請求項1または2に記載の空気入りタイヤ。
- 前記先端突起は、前記突起部本体の最小子午断面幅に対し、最大子午断面幅が1%以上50%以下に形成されていることを特徴とする請求項1~3のいずれか1つに記載の空気入りタイヤ。
- 前記先端突起は、タイヤ周方向で間欠に配置されていることを特徴とする請求項1~4のいずれか1つに記載の空気入りタイヤ。
- 前記突起部は、正規リムにリム組みし、正規内圧を充填し、正規荷重の70%を負荷した状態で、前記トレッド部の踏面と先端突起の先端とのタイヤ径方向の距離が0.5mm以上であることを特徴とする請求項1~5のいずれか1つに記載の空気入りタイヤ。
- 前記突起部は、正規リムにリム組みし、正規内圧を充填し、正規荷重の70%を負荷した状態で、子午断面における中心直線とタイヤ径方向線とのなす角度がタイヤ幅方向内側に15°以下でタイヤ幅方向外側に45°以下の範囲であることを特徴とする請求項1~6のいずれか1つに記載の空気入りタイヤ。
- 車両装着時での車両内外の向きが指定されており、少なくとも車両外側に前記突起部が形成されていることを特徴とする請求項1~7のいずれか1つに記載の空気入りタイヤ。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2015/082994 WO2017090102A1 (ja) | 2015-11-25 | 2015-11-25 | 空気入りタイヤ |
KR1020187013696A KR20180064527A (ko) | 2015-11-25 | 2015-11-25 | 공기입 타이어 |
CN201580084751.9A CN108290454A (zh) | 2015-11-25 | 2015-11-25 | 充气轮胎 |
JP2017552571A JPWO2017090102A1 (ja) | 2015-11-25 | 2015-11-25 | 空気入りタイヤ |
DE112015007149.0T DE112015007149T5 (de) | 2015-11-25 | 2015-11-25 | Luftreifen |
US15/778,621 US20180354314A1 (en) | 2015-11-25 | 2015-11-25 | Pneumatic Tire |
Applications Claiming Priority (1)
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PCT/JP2015/082994 WO2017090102A1 (ja) | 2015-11-25 | 2015-11-25 | 空気入りタイヤ |
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WO2017090102A1 true WO2017090102A1 (ja) | 2017-06-01 |
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PCT/JP2015/082994 WO2017090102A1 (ja) | 2015-11-25 | 2015-11-25 | 空気入りタイヤ |
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US (1) | US20180354314A1 (ja) |
JP (1) | JPWO2017090102A1 (ja) |
KR (1) | KR20180064527A (ja) |
CN (1) | CN108290454A (ja) |
DE (1) | DE112015007149T5 (ja) |
WO (1) | WO2017090102A1 (ja) |
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DE112020001775T5 (de) * | 2019-05-27 | 2021-12-30 | The Yokohama Rubber Co., Ltd. | Luftreifen |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000301920A (ja) * | 1999-04-19 | 2000-10-31 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
JP2004181980A (ja) * | 2002-10-09 | 2004-07-02 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
US20090133792A1 (en) * | 2007-11-22 | 2009-05-28 | Hankook Tire Co., Ltd. | Tire with decoupling groove for truck/bus |
JP2012006483A (ja) * | 2010-06-24 | 2012-01-12 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2012096776A (ja) * | 2010-10-04 | 2012-05-24 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JP2013014272A (ja) * | 2011-07-05 | 2013-01-24 | Yokohama Rubber Co Ltd:The | テンポラリータイヤ |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0891017A (ja) * | 1994-09-21 | 1996-04-09 | Bridgestone Corp | 空気入りラジアルタイヤ |
JP4492068B2 (ja) * | 2003-09-05 | 2010-06-30 | 横浜ゴム株式会社 | 空気入りラジアルタイヤ |
-
2015
- 2015-11-25 DE DE112015007149.0T patent/DE112015007149T5/de not_active Withdrawn
- 2015-11-25 WO PCT/JP2015/082994 patent/WO2017090102A1/ja active Application Filing
- 2015-11-25 JP JP2017552571A patent/JPWO2017090102A1/ja active Pending
- 2015-11-25 US US15/778,621 patent/US20180354314A1/en not_active Abandoned
- 2015-11-25 KR KR1020187013696A patent/KR20180064527A/ko not_active Application Discontinuation
- 2015-11-25 CN CN201580084751.9A patent/CN108290454A/zh active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000301920A (ja) * | 1999-04-19 | 2000-10-31 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
JP2004181980A (ja) * | 2002-10-09 | 2004-07-02 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
US20090133792A1 (en) * | 2007-11-22 | 2009-05-28 | Hankook Tire Co., Ltd. | Tire with decoupling groove for truck/bus |
JP2012006483A (ja) * | 2010-06-24 | 2012-01-12 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2012096776A (ja) * | 2010-10-04 | 2012-05-24 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JP2013014272A (ja) * | 2011-07-05 | 2013-01-24 | Yokohama Rubber Co Ltd:The | テンポラリータイヤ |
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CN108290454A (zh) | 2018-07-17 |
JPWO2017090102A1 (ja) | 2018-10-18 |
US20180354314A1 (en) | 2018-12-13 |
KR20180064527A (ko) | 2018-06-14 |
DE112015007149T5 (de) | 2018-08-02 |
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