WO2015166803A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2015166803A1 WO2015166803A1 PCT/JP2015/061501 JP2015061501W WO2015166803A1 WO 2015166803 A1 WO2015166803 A1 WO 2015166803A1 JP 2015061501 W JP2015061501 W JP 2015061501W WO 2015166803 A1 WO2015166803 A1 WO 2015166803A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tire
- land portion
- sipe
- pneumatic tire
- land
- 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
- B60C11/12—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
-
- 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
-
- 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
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
-
- 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
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
- B60C11/124—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern inclined with regard to a plane normal to the tread surface
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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
- B60C11/1259—Depth of the sipe
- B60C11/1263—Depth of the sipe different within the same sipe
-
- 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
- B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
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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
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
Definitions
- the present invention relates to a pneumatic tire, and more particularly to a pneumatic tire capable of improving wet performance while maintaining off-road performance of the tire.
- An object of the present invention is to provide a pneumatic tire capable of improving wet performance while maintaining off-road performance of the tire.
- a pneumatic tire according to the present invention includes a plurality of circumferential main grooves extending in the tire circumferential direction, a plurality of land portions defined by the circumferential main grooves, and the land portions.
- a plurality of blocks, and a three-dimensional sipe that extends over the entire circumference of the tire and divides the land portion in the tire width direction.
- the land portion in the center region of the tread portion includes a three-dimensional sipe extending over the entire circumference of the tire, so that the edge component of the land portion increases.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a plan view showing a tread surface of the pneumatic tire depicted in FIG. 1.
- FIG. 3 is an enlarged view showing a land portion of a tread portion center region of the pneumatic tire shown in FIG. 2.
- FIG. 4 is an enlarged view showing the second land portion shown in FIG.
- FIG. 5 is an explanatory diagram illustrating an example of a three-dimensional sipe.
- FIG. 6 is an explanatory diagram illustrating an example of a three-dimensional sipe.
- FIG. 7 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 8 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 9 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- the same figure has shown sectional drawing of the one-side area
- the figure shows a radial tire for a passenger car as an example of a pneumatic tire.
- the cross section in the tire meridian direction means a cross section when the tire is cut along a plane including the tire rotation axis (not shown).
- Reference sign CL denotes a tire equator plane, which is a plane that passes through the center point of the tire in the tire rotation axis direction and is perpendicular to the tire rotation axis.
- the tire width direction means a direction parallel to the tire rotation axis
- the tire radial direction means a direction perpendicular to the tire rotation axis.
- the pneumatic tire 1 has an annular structure centered on the tire rotation axis, and includes a pair of bead cores 11, a pair of bead fillers 12, 12, a carcass layer 13, a belt layer 14, and a tread rubber 15. And a pair of sidewall rubbers 16 and 16 and a pair of rim cushion rubbers 17 and 17 (see FIG. 1).
- the pair of bead cores 11 and 11 is an annular member formed by bundling a plurality of bead wires, and constitutes the core of the left and right bead portions.
- the pair of bead fillers 12 and 12 are disposed on the outer circumference in the tire radial direction of the pair of bead cores 11 and 11 to constitute a bead portion.
- the carcass layer 13 is bridged in a toroidal shape between the left and right bead cores 11 and 11 to form a tire skeleton. Further, both end portions of the carcass layer 13 are wound and locked outward in the tire width direction so as to wrap the bead core 11 and the bead filler 12.
- the carcass layer 13 is formed by rolling a plurality of carcass cords made of steel or an organic fiber material (for example, aramid, nylon, polyester, rayon, etc.) with a coat rubber, and has an absolute value of 80 [deg].
- a carcass angle of 95 [deg] or less inclination angle in the fiber direction of the carcass cord with respect to the tire circumferential direction).
- the belt layer 14 is formed by laminating a pair of cross belts 141 and 142 and a belt cover 143, and is arranged around the outer periphery of the carcass layer 13.
- the pair of cross belts 141 and 142 is formed by rolling a plurality of belt cords made of steel or organic fiber material with a coating rubber, and has an absolute value of a belt angle of 20 [deg] or more and 55 [deg] or less.
- the pair of cross belts 141 and 142 have belt angles with different signs from each other (inclination angle of the fiber direction of the belt cord with respect to the tire circumferential direction), and are laminated so that the fiber directions of the belt cords cross each other. (Cross ply structure).
- the belt cover 143 is formed by rolling a plurality of cords made of steel or organic fiber material covered with a coat rubber, and has a belt angle of 0 [deg] or more and 10 [deg] or less in absolute value. Further, the belt cover 143 is disposed so as to be laminated on the outer side in the tire radial direction of the cross belts 141 and 142.
- the tread rubber 15 is disposed on the outer circumference in the tire radial direction of the carcass layer 13 and the belt layer 14 to constitute a tread portion of the tire.
- the pair of side wall rubbers 16 and 16 are respectively arranged on the outer side in the tire width direction of the carcass layer 13 to constitute left and right side wall portions.
- the pair of rim cushion rubbers 17, 17 are respectively disposed on the inner side in the tire radial direction of the wound portions of the left and right bead cores 11, 11 and the carcass layer 13, and constitute the contact surfaces of the left and right bead portions with respect to the rim flange.
- FIG. 2 is a plan view showing a tread surface of the pneumatic tire depicted in FIG. 1.
- the figure shows a tread pattern of a winter tire mounted on an RV (Recreational Vehicle) or the like.
- the tire circumferential direction refers to the direction around the tire rotation axis.
- symbol T is a tire grounding end.
- the pneumatic tire 1 includes a plurality of circumferential main grooves 21 and 22 extending in the tire circumferential direction, a plurality of land portions 31 to 33 defined by the circumferential main grooves 21 and 22, and the land
- the tread portion includes a plurality of lug grooves 41 to 43 arranged in the portions 31 to 33 (see FIG. 2).
- the circumferential main groove is a circumferential groove having a wear indicator indicating the end of wear, and generally has a groove width of 5.0 [mm] or more and a groove depth of 7.5 [mm] or more.
- the lug groove refers to a lateral groove having a groove width of 3.0 [mm] or more and a groove depth of 4.0 [mm] or more.
- the sipe described later is a cut formed in the land portion, and generally has a sipe width of less than 1.0 [mm].
- the groove width is measured as the maximum value of the distance between the left and right groove walls at the groove opening in a no-load state in which the tire is mounted on the specified rim and filled with the specified internal pressure.
- the groove width is based on the intersection of the tread surface and the extension line of the groove wall in a cross-sectional view in which the groove length direction is a normal direction. Measured.
- the groove width is measured with reference to the center line of the amplitude of the groove wall.
- the groove depth is measured as the maximum value of the distance from the tread surface to the groove bottom in an unloaded state in which the tire is mounted on the specified rim and filled with the specified internal pressure. Moreover, in the structure which a groove
- the stipulated rim means “applied rim” defined in JATMA, “Design Rim” defined in TRA, or “Measuring Rim” defined in ETRTO.
- the specified internal pressure means “maximum air pressure” specified by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATIONLPRESSURES” specified by TRA, or “INFLATION PRESSURES” specified by ETRTO.
- the specified load means the “maximum load capacity” defined by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFUREATION PRESSURES” prescribed by TRA, or “LOAD CAPACITY” prescribed by ETRTO.
- the specified internal pressure is air pressure 180 [kPa]
- the specified load is 88 [%] of the maximum load capacity.
- the four circumferential main grooves 21 and 22 having a straight shape are arranged symmetrically about the tire equatorial plane CL.
- the wear forms in the left and right regions with the tire equator plane CL as a boundary are uniformed, This is preferable in that the wear life of the tire is improved.
- the present invention is not limited to this, and the circumferential main grooves 21 and 22 may be arranged asymmetrically about the tire equatorial plane CL (not shown). Further, the circumferential main groove may be disposed on the tire equatorial plane CL (not shown). Further, the circumferential main groove may have a zigzag shape or a wavy shape extending while being bent or curved in the tire circumferential direction, and three or five or more circumferential main grooves may be arranged. (Not shown).
- the left and right circumferential main grooves 22 and 22 on the outermost side in the tire width direction are referred to as outermost circumferential main grooves.
- the tread portion center region and the tread portion shoulder region are defined with the left and right outermost circumferential main grooves 22 and 22 as boundaries.
- the land portion 31 in the center is called the center land portion.
- the left and right land portions 32, 32 on the inner side in the tire width direction defined by the outermost circumferential main grooves 22, 22 are referred to as second land portions.
- the left and right land portions 33, 33 on the outermost side in the tire width direction are referred to as shoulder land portions.
- the left and right shoulder land portions 33, 33 are disposed on the left and right tire ground contact ends T, T, respectively.
- the center land portion 31 is disposed on the tire equatorial plane CL.
- the left and right land portions defined by the circumferential main groove are the center land portions.
- all the land portions 31 to 33 each have a plurality of lug grooves 41 to 43 extending in the tire width direction.
- the lug grooves 41 to 43 have an open structure that penetrates the land portions 31 to 33 in the tire width direction, and are arranged at predetermined intervals in the tire circumferential direction. As a result, all the land portions 31 to 33 are divided into a plurality of blocks in the tire circumferential direction by the lug grooves 41 to 43 to form a block row.
- the present invention is not limited to this, and the lug grooves 41 to 43 may have a semi-closed structure that terminates in the land portions 31 to 33 at one end (not shown).
- the land portions 31 to 33 are ribs continuous in the tire circumferential direction.
- FIG. 3 is an enlarged view showing a land portion of a tread portion center region of the pneumatic tire shown in FIG. 2.
- FIG. 4 is an enlarged view showing the second land portion shown in FIG.
- the land portions 31 and 32 in the center region of the tread portion have a plurality of sipes 51 and 52, respectively.
- These sipes 51 and 52 are classified into two-dimensional sipes (planar sipes) 51 and three-dimensional sipes (three-dimensional sipes) 52.
- planar sipes planar sipes
- three-dimensional sipes three-dimensional sipes
- a two-dimensional sipe is a sipe having a sipe wall surface that is linear in a sectional view (a sectional view including a sipe width direction and a sipe depth direction) with the sipe length direction as a normal direction.
- the two-dimensional sipe may have a straight shape on the tread surface, a zigzag shape, a wave shape, or an arc shape.
- a three-dimensional sipe is a sipe having a sipe wall surface that is bent in the sipe width direction in a cross-sectional view with the sipe length direction as the normal direction.
- the three-dimensional sipe has an action of reinforcing the rigidity of the land portion because the meshing force of the opposing sipe wall surfaces is stronger than that of the two-dimensional sipe.
- the three-dimensional sipe may have a straight shape on the tread surface, a zigzag shape, a wave shape, or an arc shape. Examples of such a three-dimensional sipe include the following (see FIGS. 5 and 6).
- FIGS. 5 and 6 are explanatory diagrams showing an example of a three-dimensional sipe. These drawings show a perspective view of a three-dimensional sipe having a pyramidal sipe wall surface. In these three-dimensional sipe, a pair of opposing sipe wall surfaces has a wall surface shape formed by continuously arranging a plurality of pyramids or prisms in the sipe length direction.
- the sipe wall surface has a structure in which a triangular pyramid and an inverted triangular pyramid are connected in the sipe length direction.
- the sipe wall surface has a zigzag shape on the tread surface side and a zigzag shape on the bottom side that are shifted in pitch in the tire width direction, and unevenness that faces each other between the zigzag shapes on the tread surface side and the bottom side.
- the sipe wall surface is an unevenness when viewed in the tire rotation direction among these unevennesses, between the convex bending point on the tread surface side and the concave bending point on the bottom side, the concave bending point on the tread surface side and the bottom side Between the convex bend points of the tread surface and the convex bend points on the tread surface side, and adjacent convex bend points that are adjacent to each other with ridge lines, and the ridge lines between the ridge lines in order in the tire width direction. It is formed by connecting in a plane.
- one sipe wall surface has an uneven surface in which convex triangular pyramids and inverted triangular pyramids are arranged alternately in the tire width direction, and the other sipe wall surface alternates between concave triangular pyramids and inverted triangular pyramids.
- the sipe wall surface has the uneven
- the sipe wall surface has a structure in which a plurality of rectangular columns having a block shape are connected in the sipe depth direction and the sipe length direction while being inclined with respect to the sipe depth direction.
- the sipe wall surface has a zigzag shape on the tread surface.
- the sipe wall surface has a bent portion that is bent in the tire circumferential direction at two or more locations in the tire radial direction inside the block and continues in the tire width direction, and has an amplitude in the tire radial direction at the bent portion. It has a zigzag shape.
- the sipe wall surface makes the tire circumferential amplitude constant
- the inclination angle in the tire circumferential direction with respect to the normal direction of the tread surface is made smaller at the sipe bottom side part than the tread surface side part and bent.
- the amplitude of the tire in the tire radial direction is made larger at the sipe bottom side than at the tread surface side.
- At least one row of land portions 32 of the land portions 31 and 32 in the tread portion center region includes a three-dimensional sipe 52 extending in the tire circumferential direction.
- the three-dimensional sipe 52 extends over the entire circumference of the tire and divides the land portion 32 in the tire width direction.
- each block of the center land portion 31 has six two-dimensional sipes 51 respectively,
- the original sipe 52 is not provided.
- all the two-dimensional sipes 51 have a semi-closed structure, open to the four edge portions of the block at one end portion, and terminate inside the block at the other end portion.
- the block is not divided by sipes and has a continuous structure in the tire width direction. Thereby, the rigidity of the block is ensured.
- each block of the left and right second land portions 32, 32 has four two-dimensional sipes 51 and one three-dimensional sipes 52, respectively. Further, all the two-dimensional sipes 51 open to the edge portion on the circumferential main grooves 21 and 22 side of the block at one end portion, and terminate inside the block at the other end portion. Thereby, the rigidity of the block is ensured.
- the three-dimensional sipe 52 extends over the entire circumference of the tire and divides the block of the land portion 32 in the tire width direction. Specifically, the three-dimensional sipe 52 passes through the block in the tire circumferential direction, and opens to the front and rear lug grooves 42 and 42 that partition the block, respectively. Further, the three-dimensional sipe 52 and the two-dimensional sipe 51 are not connected. As a result, the rigidity of the block is ensured, and the edge component of the block is increased by the three-dimensional sipe 52.
- the land portion 32 in the center region of the tread portion includes the three-dimensional sipe 52 extending over the entire circumference of the tire, whereby the edge component of the land portion 32 increases.
- the edge component of the land portion 32 increases.
- the wall surfaces of the three-dimensional sipe 52 mesh with each other at the time of tire contact, the rigidity of the block of the land portion 32 is ensured as compared with the two-dimensional sipe 51. Thereby, the snow performance of a tire improves.
- the groove area ratio S1 of the center land portion 31 and the groove area ratio S2 of the second land portion 32 have a relationship of S1 ⁇ S2.
- the groove area ratios S1 and S2 are defined as groove area in each land portion / (groove area + ground contact area).
- the groove area refers to the opening area of the groove on the ground contact surface.
- the groove refers to a lug groove and a narrow groove formed in the land portion, and does not include a circumferential groove in the tread portion, a sipe, a kerf, a notch portion, or the like.
- the ground contact area is the contact area between the land and the road surface.
- the groove area and the contact area are determined when the tire is mounted on the specified rim and applied with the specified internal pressure, and is placed perpendicular to the flat plate in a stationary state and applied with a load corresponding to the specified load. Measured at the contact surface between the plate and the flat plate.
- the groove width Wr1 of the lug groove 41 in the center land portion 31 and the groove width Wr2 of the lug groove 42 in the second land portion 32 in the plurality of land portions 31 to 33 are Wr1 ⁇ Wr2. Have the relationship.
- the land width Wb1 of the center land portion 31 and the land width Wb2 of the second land portion 32 have a relationship of Wb1 ⁇ Wb2.
- the land portion widths Wb1 and Wb2 are measured as the maximum value of the distance in the width direction on the tread surface of the land portion in a no-load state in which the tire is mounted on the specified rim and filled with the specified internal pressure. Moreover, in the structure which a land part has a notch part and a chamfering part in an edge part, a land part width
- FIG. 7 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1. This figure shows an enlarged view of the second land portion 32 having the three-dimensional sipe 52.
- the rigidity of the block in the tire circumferential direction is greater than in a configuration in which the three-dimensional sipe extends in the tire width direction.
- the present invention is not limited to this, and as shown in FIG. 7, the three-dimensional sipe 52 may be disposed to be inclined with respect to the tire circumferential direction.
- the inclination angle ⁇ of the three-dimensional sipe 52 with respect to the tire circumferential direction is preferably in the range of ⁇ 5 [deg] ⁇ ⁇ ⁇ 5 [deg].
- the three-dimensional sipe 52 extends substantially parallel to the tire equatorial plane CL, so that the rigidity of the block in the tire circumferential direction is appropriately ensured.
- the three-dimensional sipe 52 has a zigzag shape that linearly extends in the tire circumferential direction as a whole on the tread surface of the land portion 32.
- the present invention is not limited to this, and the three-dimensional sipe 52 may have a zigzag shape extending on the tread surface of the land portion 32 while being bent or curved as a whole (not shown).
- the inclination angle ⁇ of the three-dimensional sipe 52 is an angle formed by a straight line connecting the front and rear openings of the three-dimensional sipe 52 and the tire circumferential direction. Measured.
- the present invention is not limited to this.
- the three-dimensional sipes 52 are arranged to be inclined with respect to the tire circumferential direction so that the openings of the adjacent three-dimensional sipes 52 and 52 are offset from each other. May be arranged.
- the offset amount G of the three-dimensional sipes 52 and 52 and the width Wb2 of the land portion 32 have a relationship of G / Wb2 ⁇ 0.15.
- the offset amount G is measured as the distance in the tire width direction of the opening position with respect to the lug grooves 42 of the three-dimensional sipes 52 and 52 adjacent in the tire circumferential direction.
- FIG. 8 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. The figure shows a schematic view when the second land portion 32 is cut along the sipe wall surface of the three-dimensional sipe 52.
- the three-dimensional sipe 52 passes through the block of the land portion 32 in the tire circumferential direction and opens in the lug groove 42.
- the three-dimensional sipe 52 has a bottom upper portion 521 at a connection portion with respect to the lug groove 42.
- the bottom upper part 521 of the three-dimensional sipe 52 refers to a portion in FIG. 8 where the sipe depth Hs ′ of the three-dimensional sipe 52 is 15% or more and 45% or less with respect to the maximum sipe depth Hs. .
- the sipe depth Hs ′ at the bottom upper part 521 is measured as a distance in the sipe depth direction from the tire profile to the bottom upper part 521.
- the blocks of the land portions 31 and 32 in the center region of the tread portion each have a plurality of two-dimensional sipes 51.
- the wet performance and the snow performance of the tire are improved by the water absorption action and the edge component by the sipe.
- the present invention is not limited to this, and instead of the two-dimensional sipe 51, for example, a kerf or a narrow groove may be arranged (not shown).
- the left and right second land portions 32, 32 have a three-dimensional sipe 52 extending in the tire circumferential direction, and the center land portion 31 does not have such a three-dimensional sipe 52.
- the center land portion 31 is not divided into three-dimensional sipes 52 and has a structure that is continuous in the tire width direction.
- the rigidity of the center land portion 31 is ensured, which is preferable in that the falling of the block during braking / driving is suppressed and the snow performance of the tire is improved.
- the configuration is not limited to this, and the center land portion 31 has a three-dimensional sipe 52 extending in the tire circumferential direction, and the left and right second land portions 32, 32 do not have such a three-dimensional sipe 52. May be omitted (not shown).
- the pneumatic tire 1 includes a plurality of circumferential main grooves 21 and 22 that extend in the tire circumferential direction, and a plurality of land portions 31 that are partitioned by the circumferential main grooves 21 and 22.
- a plurality of lug grooves 41 to 43 arranged in the land portions 31 to 33 see FIG. 2.
- at least one row of the land portions 32 of the center land portion 31 and the second land portion 32 extends over the tire circumference and a plurality of blocks divided in the tire circumferential direction by the plurality of lug grooves 42.
- a three-dimensional sipe 52 that divides the land portion 32 in the tire width direction (see FIGS. 3 and 4).
- the land portion 32 in the tread portion center region includes the three-dimensional sipe 52 extending over the entire circumference of the tire, whereby the edge component of the land portion 32 increases.
- the edge component of the land portion 32 increases.
- the pneumatic tire 1 includes four or more circumferential main grooves 21 and 22 and five rows of land portions 31 to 33 defined by the circumferential main grooves 21 and 22 (see FIG. 2). .
- the center land portion 31 includes a plurality of lug grooves 41 and a plurality of blocks having a structure continuous in the tire width direction (see FIG. 3).
- the second land portion 32 includes a plurality of lug grooves 42 and a plurality of blocks divided in the tire width direction by the three-dimensional sipe 52.
- the rigidity and grounding of the land portion 32 are compared with a configuration in which the second land portion 32 has a circumferential narrow groove instead of the three-dimensional sipe 52 (not shown). Increases area. Thereby, there exists an advantage which the turning performance of the tire in a wet road and a snow road improves.
- the pneumatic tire 1 includes four or more circumferential main grooves 21 and 22 and five rows of land portions 31 to 33 defined by the circumferential main grooves 21 and 22 (see FIG. 2).
- the center land portion 31 includes a plurality of lug grooves 41 and a plurality of blocks divided in the tire width direction by a three-dimensional sipe 52 (not shown).
- the second land portion 32 includes a plurality of lug grooves 42 and a plurality of blocks having a structure that is continuous in the tire width direction. In such a configuration, since the center land portion 31 has the three-dimensional sipe 52, there is an advantage that the snow performance of the tire is improved while ensuring the rigidity of the land portion 31.
- a land portion having the three-dimensional sipe 52 (second land portion 32 in FIG. 2) has two or more two-dimensional sipe 51 in a plurality of blocks (see FIG. 3).
- the edge component of the land part 32 increases and there exists an advantage which the mud performance and snow performance of a tire improve.
- the three-dimensional sipe 52 penetrates the block of the land portion 32 in the tire circumferential direction (see FIG. 4). Thereby, the edge component of the land part 32 increases and there exists an advantage which the mud performance and snow performance of a tire improve.
- the inclination angle ⁇ (see FIGS. 4 and 7) of the three-dimensional sipe 52 with respect to the tire circumferential direction is in the range of ⁇ 5 [deg] ⁇ ⁇ ⁇ 5 [deg].
- the three-dimensional sipe 52 extends substantially parallel to the tire equatorial plane CL, when the vehicle turns on the snow, the collapse of the block is suppressed, and the snow braking performance and the steering stability performance are ensured. There is.
- the groove area ratio S1 of the center land portion 31 and the groove area ratio S2 of the second land portion 32 have a relationship of S1 ⁇ S2 (see FIG. 3).
- the groove width Wr1 of the lug groove 41 in the center land portion 31 and the groove width Wr2 of the lug groove 42 in the second land portion 32 have a relationship of Wr1 ⁇ Wr2 (FIG. 3). reference).
- the land width Wb1 of the center land portion 31 and the land width Wb2 of the second land portion 32 have a relationship of Wb1 ⁇ Wb2 (see FIG. 3).
- the three-dimensional sipe 52 is connected to the lug groove 42 at at least one end portion, and has a bottom upper portion 521 at a connection portion to the lug groove 42 (see FIG. 8).
- the rigidity of the edge portion of the block in the tire circumferential direction is ensured, and the collapse of the block at the time of tire contact is suppressed.
- the snow performance of a tire improves.
- FIG. 9 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- test tire having a tire size of 265 / 70R17 113T is assembled to a rim having a rim size of 17 ⁇ 7.5 J, and an air pressure of 230 [kPa] and a maximum load specified by JATMA are applied to the test tire.
- the test tire is attached to all the wheels of the RV vehicle that is the test vehicle.
- test tires of Examples 1 to 7 have the configurations described in FIGS. However, in the test tire of Example 2, the three-dimensional sipe 52 extending in the tire circumferential direction is disposed not in the second land portion 32 but in the center land portion 31.
- the land portions 31 and 32 in the center region of the tread portion are not provided with the three-dimensional sipe 52 in the test tire of the first example.
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- Engineering & Computer Science (AREA)
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- Tires In General (AREA)
Abstract
Description
図1は、この発明の実施の形態にかかる空気入りタイヤを示すタイヤ子午線方向の断面図である。同図は、タイヤ径方向の片側領域の断面図を示している。また、同図は、空気入りタイヤの一例として、乗用車用ラジアルタイヤを示している。
図2は、図1に記載した空気入りタイヤのトレッド面を示す平面図である。同図は、RV(Recreational Vehicle)等に装着されるウィンター用タイヤのトレッドパターンを示している。同図において、タイヤ周方向とは、タイヤ回転軸周りの方向をいう。また、符号Tは、タイヤ接地端である。
図3は、図2に記載した空気入りタイヤのトレッド部センター領域の陸部を示す拡大図である。図4は、図3に記載したセカンド陸部を示す拡大図である。
図7は、図1に記載した空気入りタイヤの変形例を示す説明図である。同図は、三次元サイプ52を有するセカンド陸部32の拡大図を示している。
以上説明したように、この空気入りタイヤ1は、タイヤ周方向に延在する複数の周方向主溝21、22と、これらの周方向主溝21、22に区画されて成る複数の陸部31~33と、これらの陸部31~33に配置される複数のラグ溝41~43とを備える(図2参照)。また、センター陸部31およびセカンド陸部32のうちの少なくとも1列の陸部32が、複数のラグ溝42によりタイヤ周方向に分断された複数のブロックと、タイヤ全周に渡って延在して陸部32をタイヤ幅方向に分断する三次元サイプ52とを備える(図3および図4参照)。
Claims (15)
- タイヤ周方向に延在する複数の周方向主溝と、前記周方向主溝に区画されて成る複数の陸部と、前記陸部に配置される複数のラグ溝とを備える空気入りタイヤであって、
センター陸部およびセカンド陸部のうちの少なくとも1列の前記陸部が、前記複数のラグ溝によりタイヤ周方向に分断された複数のブロックと、タイヤ全周に渡って延在して前記陸部をタイヤ幅方向に分断する三次元サイプとを備えることを特徴とする空気入りタイヤ。 - 4本以上の前記周方向主溝と、前記周方向主溝に区画されて成る5列の前記陸部とを備え、且つ、
前記センター陸部が、前記複数のラグ溝と、タイヤ幅方向に連続した構造をもつ前記複数のブロックとを有すると共に、前記セカンド陸部が、前記複数のラグ溝と、前記三次元サイプによりタイヤ幅方向に分断された前記複数のブロックとを有する請求項1に記載の空気入りタイヤ。 - 4本以上の前記周方向主溝と、前記周方向主溝に区画されて成る5列の前記陸部とを備え、且つ、
前記センター陸部が、前記複数のラグ溝と、前記三次元サイプによりタイヤ幅方向に分断された前記複数のブロックとを有すると共に、前記セカンド陸部が、前記複数のラグ溝と、タイヤ幅方向に連続した構造をもつ前記複数のブロックとを有する請求項1に記載の空気入りタイヤ。 - 前記三次元サイプを有する前記陸部が、2本以上の二次元サイプを前記複数のブロックにそれぞれ有する請求項1~3のいずれか一つに記載の空気入りタイヤ。
- 前記三次元サイプが、前記陸部のブロックをタイヤ周方向に貫通する請求項1~4のいずれか一つに記載の空気入りタイヤ。
- 前記三次元サイプのタイヤ周方向に対する傾斜角θが、-5[deg]≦θ≦5[deg]の範囲にある請求項1~5のいずれか一つに記載の空気入りタイヤ。
- タイヤ周方向に隣り合う前記ブロックの前記三次元サイプの開口部のオフセット量Gと、前記陸部の幅Wとが、0≦G/Wb≦0.15の関係を有する請求項1~6のいずれか一つに記載の空気入りタイヤ。
- 前記センター陸部の溝面積比S1と、前記セカンド陸部の溝面積比S2とが、S1<S2の関係を有する請求項1~7のいずれか一つに記載の空気入りタイヤ。
- 前記センター陸部にある前記ラグ溝の溝幅Wr1と、前記セカンド陸部にある前記ラグ溝の溝幅Wr2とが、Wr1<Wr2の関係を有する請求項1~8のいずれか一つに記載の空気入りタイヤ。
- 前記センター陸部の陸部幅Wb1と、前記セカンド陸部の陸部幅Wb2とが、Wb1<Wb2の関係を有する請求項1~9のいずれか一つに記載の空気入りタイヤ。
- 前記三次元サイプが、少なくとも一方の端部にて前記ラグ溝に接続すると共に、前記ラグ溝に対する接続部に底上部を有する請求項1~10のいずれか一つに記載の空気入りタイヤ。
- 前記センター陸部が、複数の前記ブロックを備え、
前記ブロックが、前記ブロックの四方に開口する複数の二次元サイプを有し、且つ、
前記二次元サイプが、一方の端部にて前記ブロックのエッジ部に開口すると共に、他方の端部にて前記ブロックの内部で終端するセミクローズド構造を有する請求項1~11のいずれか一つに記載の空気入りタイヤ。 - 前記セカンド陸部が、複数の前記ブロックを備え、
前記ブロックが、前記ブロックの四方に開口する複数の二次元サイプを有し、且つ、
前記二次元サイプが、一方の端部にて前記ブロックのエッジ部に開口すると共に、他方の端部にて前記ブロックの内部で終端するセミクローズド構造を有する請求項1~12のいずれか一つに記載の空気入りタイヤ。 - 前記二次元サイプと前記三次元サイプとが接続しない請求項12または13に記載の空気入りタイヤ。
- 前記三次元サイプの前記底上部のサイプ深さHs’が、前記三次元サイプの最大サイプ深さHsに対して15[%]以上45[%]以下となる請求項11に記載の空気入りタイヤ。
Priority Applications (4)
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US15/308,347 US10179483B2 (en) | 2014-05-01 | 2015-04-14 | Pneumatic tire |
JP2015519119A JP5920532B2 (ja) | 2014-05-01 | 2015-04-14 | 空気入りタイヤ |
DE112015002093.4T DE112015002093T5 (de) | 2014-05-01 | 2015-04-14 | Luftreifen |
CN201580023589.XA CN106457923B (zh) | 2014-05-01 | 2015-04-14 | 充气轮胎 |
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JP (1) | JP5920532B2 (ja) |
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JP2020183167A (ja) * | 2019-05-07 | 2020-11-12 | 横浜ゴム株式会社 | 空気入りタイヤ |
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JP6878971B2 (ja) * | 2017-03-15 | 2021-06-02 | 住友ゴム工業株式会社 | タイヤ |
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CN106457923A (zh) | 2017-02-22 |
US10179483B2 (en) | 2019-01-15 |
DE112015002093T5 (de) | 2017-02-09 |
CN106457923B (zh) | 2019-03-12 |
US20170057297A1 (en) | 2017-03-02 |
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