WO2012043036A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2012043036A1 WO2012043036A1 PCT/JP2011/066868 JP2011066868W WO2012043036A1 WO 2012043036 A1 WO2012043036 A1 WO 2012043036A1 JP 2011066868 W JP2011066868 W JP 2011066868W WO 2012043036 A1 WO2012043036 A1 WO 2012043036A1
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- WO
- WIPO (PCT)
- Prior art keywords
- groove
- tire
- land
- center
- corrugated
- 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
- B60C11/1369—Tie bars for linking block elements and bridging the groove
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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
- B60C11/0302—Tread patterns directional pattern, i.e. with main rolling 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
- B60C11/0306—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
- B60C11/1204—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
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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
- B60C11/1236—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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- 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
- B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
- B60C2011/0369—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth with varying depth of the groove
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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
- B60C2011/0381—Blind or isolated grooves
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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
- B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface
Definitions
- the present invention relates to a pneumatic tire applied to a pneumatic tire and having a plurality of land portions on a tread.
- the rigidity of the block is lowered, and there is a concern that the steering stability is lowered. If the land area is increased to increase the rigidity of the block, the drainage performance is lowered.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a pneumatic tire capable of achieving both noise reduction, suppression of land chipping and cracking, and drainage at a high level.
- the pneumatic tire according to the first aspect of the present invention is a center land portion defined by circumferential grooves disposed on both sides of the tire equatorial plane of the tread.
- the center land area is formed with an interval in the tire circumferential direction, and connects the circumferential groove on one side of the tire equator plane and the circumferential groove on the other side, and in a direction inclined with respect to the tire equator plane.
- a plurality of corrugated grooves extending with amplitude, and one corrugated groove adjacent to each other in the tire circumferential direction, a peak portion protruding to one side in the tire width direction, and the other wave adjacent to the tire circumferential direction.
- the plurality of corrugated grooves are arranged in the center land portion area so that the peak portions protruding to the other side in the tire width direction of the mold groove face each other.
- a plurality of obliquely extending land portions whose tire width direction dimensions change alternately in the tire width direction toward both sides of the groove extending direction are divided into a plurality of tire circumferential directions, and the circumference extends within the obliquely extending land portions.
- Adjacent to the directional groove and the circumferential groove and the corrugated The circumferential direction groove and the corrugated groove are connected in the tire width direction, and the first bent portion and the first direction are different from each other.
- a first connecting groove having a second bent portion bent in a direction at an intermediate portion is formed; A first corner formed at the side small land portion by the first bent portion and a second corner formed at the side small land portion by the second bent portion at the groove bottom of the first connecting groove.
- a bottom raised portion connected to at least one of the two corners is formed, a first chamfered portion is formed at the first corner, and a second chamfered portion is formed at the second corner.
- a plurality of corrugated grooves extending with an amplitude in a direction inclined with respect to the tire equatorial plane are formed at intervals in the tire circumferential direction so as to connect the circumferential grooves.
- the edge of the diagonally extending land portion gradually touches the road surface during driving, and noise ( In particular, the occurrence of striking sound) is suppressed.
- the wide part of the other diagonally extending land part is arranged in the narrow part of one diagonally extending land part adjacent to each other, and the diagonally extending land part Since the narrow portions and the wide portions of the obliquely extending land portions are alternately arranged, the rigidity of the entire center land region can be made substantially uniform.
- the circumferential groove and the corrugated groove are arranged in the tire width direction. Since the 1st connection groove
- the first connecting groove includes a first bent portion that bends in the first direction and a second bent portion that bends in a direction different from the first direction in the intermediate portion, the first connecting groove is simply a straight line.
- the edge component in the tire width direction and the edge component in the tire circumferential direction are increased, and an edge that exhibits an effect on a rough road or the like can be made longer.
- the bottom raised portion serves as a reinforcement for at least one of the first corner portion and the second corner portion, and the first corner portion and the first corner portion The rigidity of at least one of the two corners can be improved.
- a high reinforcing effect can be obtained by the raised bottom portion.
- the first chamfered portion is formed at the first corner and the second chamfered portion is formed at the second corner to reduce the contact pressure at the corner, the lateral small land portion is reduced on the road surface.
- the chipping of the corners due to stones or the like can be suppressed.
- the contact pressure at the corners is reduced, the amount of displacement in the tire width direction of the sharp corners caused by stones etc. on the road surface is reduced, so cracks that are likely to occur from the groove bottom around the corners are suppressed. Can do.
- the invention according to a second aspect is the pneumatic tire according to the first aspect, wherein one ridge portion that protrudes to one side in the tire width direction of one corrugated groove adjacent to the tire circumferential direction, and the tire A second connecting groove that connects the other peak portion protruding toward the one peak portion in the other corrugated groove adjacent in the circumferential direction is formed in the center land area, In the obliquely extending land portion, a center small land portion is formed on the tire equator plane and separated from the side small land portion via the second connection groove, and the second connection groove of the center small land portion is formed.
- the side end portion and the end portion on the second connecting groove side of the side small land portion have a concave curved surface portion when viewed in a cross section perpendicular to the tire tread surface and perpendicular to the second connecting groove.
- the invention according to a third aspect is the pneumatic tire according to the second aspect, wherein a virtual perpendicular extending from a groove bottom side end of the stepped inclined portion toward the outer side in the tire radial direction, and a land tread
- a virtual perpendicular extending from a groove bottom side end of the stepped inclined portion toward the outer side in the tire radial direction and a land tread
- the distance L from the end portion on the land portion tread side of the stepped inclined portion to the intersection P is the step It is set to be smaller than the distance D from the end on the groove bottom side of the inclined portion to the intersection P.
- the distance L from the end of the stepped inclined portion on the tread surface side to the intersection P is smaller than the distance D from the end of the stepped inclined portion on the groove bottom side to the intersection P.
- the invention according to a fourth aspect is the pneumatic tire according to the first to third aspects, wherein the corrugated groove has a displacement portion displaced in the tire width direction at a middle portion in the longitudinal direction, so that the center land In the region, at least the edge component in the tire width direction is increased in the displacement portion.
- the pneumatic tire according to the first aspect since the pneumatic tire according to the first aspect has the above-described configuration, it has excellent effects that noise reduction, suppression of land chipping and cracking, and drainage can be achieved at a high level.
- the pneumatic tire according to the second aspect has the above-described configuration, it has an excellent effect that the running performance on a rough road can be improved.
- the pneumatic tire according to the third aspect has the above-described configuration, it has an excellent effect that the running performance on a flat road can be ensured while improving the running performance on a rough road.
- the pneumatic tire according to the fourth aspect has the above-described configuration, it has an excellent effect that the running performance on a rough road can be further improved.
- FIG. 6 is a plan view of a side small land portion of a pneumatic tire according to Comparative Example 2.
- FIG. 6 is a plan view of a tread of a pneumatic tire according to Comparative Example 3.
- FIG. 6 is a plan view of a tread of a pneumatic tire according to Comparative Example 3.
- the tread 12 of the pneumatic tire 10 of the present embodiment has a straight line in the tire circumferential direction (the direction of arrow A and the direction opposite to the direction of arrow A) on both sides of the tire equatorial plane CL.
- a pair of circumferential grooves 14 extending in a shape are provided.
- the circumferential groove 14 of the present embodiment has a width of 11 (average value) mm and a groove depth of 11 mm.
- the groove width center of the circumferential groove 14 is located at 55% of the contact width TW from the contact end 12E of the tread 12 toward the tire equatorial plane CL.
- the center land region 16 and the tire width direction (arrow W direction) outside of the circumferential groove 14 thereafter. Will be referred to as a shoulder land area 18.
- symbol TW in a figure has shown the contact width.
- the contact width is based on the maximum load capacity in the applicable size / ply rating and the corresponding air pressure (maximum air pressure) in accordance with JATMA YEAR BOOK in 2010. It is the maximum width in the tire width direction of the portion that contacts the road surface.
- the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards are followed.
- reference numeral 12E in the figure indicates a grounding end of the tread 12. (Center land area) As shown in FIGS.
- the center land area 16 is inclined with respect to the tire circumferential direction so as to connect the circumferential groove 14 on the left side of the drawing and the circumferential groove 14 on the right side of the drawing.
- a plurality of corrugated grooves 20 extending in the tire circumferential direction are formed with an amplitude.
- the corrugated groove 20 of the present embodiment extends as a whole ascending to the right, it may extend as a whole ascending to the left.
- the corrugated groove 20 of the present embodiment is configured by alternately connecting four curved portions having a substantially arc shape, and has a center of curvature on the left side of the corrugated groove 20 from the left side of the drawing.
- the fourth arc groove 20D on the right side is continuous from the right side to the left side in the drawing.
- the angle of the first arcuate groove 20A with respect to the tire circumferential direction gradually decreases from the circumferential groove side on the left side of the drawing toward the tire equatorial plane.
- the angle of the second arc groove 20B with respect to the tire circumferential direction gradually increases from the first arc groove 20A side toward the tire equatorial plane.
- the direction of the corrugated groove 20 is substantially the tire circumferential direction.
- the angle of the third arcuate groove portion 20C with respect to the tire circumferential direction gradually decreases from the tire equator surface toward the circumferential groove side on the right side of the drawing, and the fourth arcuate groove portion 20D extends from the third arcuate groove portion 20C to the circumference of the right side of the drawing.
- the angle with respect to the tire circumferential direction gradually increases toward the direction groove side.
- the direction of the corrugated groove 20 is substantially the tire circumferential direction.
- the corrugated grooves 20 are arranged at intervals in the tire circumferential direction, and the second arc groove portion of the other corrugated groove 20 is adjacent to the first arc groove portion 20A of the one corrugated groove 20.
- 20B is opposed to the third arcuate groove 20C of one corrugated groove 20, and the fourth arcuate groove 20D of the other adjacent corrugated groove 20 is opposed.
- first arc groove portion 20A of one corrugated groove 20” in the present embodiment corresponds to “a peak portion that protrudes to one side in the other width direction of one corrugated groove adjacent to each other” in claim 1.
- second arcuate groove portion 20B of the other adjacent corrugated groove 20” of the present embodiment is convex to the other side in the tire width direction of the other corrugated groove adjacent to the tire circumferential direction of claim 1. It corresponds to “mountain part”.
- the third arcuate groove portion 20C of one corrugated groove 20 corresponds to “a crest portion protruding to one side in the other width direction of one corrugated groove adjacent to each other” in claim 1
- the “fourth arc groove 20D of the other adjacent corrugated groove 20” of the embodiment is “the mountain portion that protrudes to the other side in the tire width direction of the other corrugated groove adjacent to the tire circumferential direction” in claim 1. It corresponds to.
- the interval between the one corrugated groove 20 and the other corrugated groove 20 that are adjacent to each other changes alternately in the direction of the extending direction of the corrugated groove 20 (direction inclined with respect to the tire circumferential direction).
- a diagonally extending land portion 22 extending in the same direction as the wave groove 20 is formed between one wave groove 20 and the other wave groove 20 adjacent to each other.
- the dimensions in the tire width direction are alternately changed in size toward the extending direction.
- a groove 24 is formed, and a connecting groove 24 is formed so as to connect the third arcuate groove part 20C of one corrugated groove 20 and the fourth arcuate groove part 20D of the other corrugated groove 20 adjacent to each other.
- the connecting groove 24 extends substantially along the tire circumferential direction.
- the corrugated groove 20 and the connecting groove 24 are formed in the obliquely extending land portion 22 of the center land area 16, so that two corrugated grooves are formed on the tire equatorial plane CL of the tread 12.
- 20 and two connecting grooves 24 a plurality of center small land portions 26 are arranged along the tire equator plane CL, and two corrugated grooves 20, 1 are provided on both sides of the center small land portion 26 in the tire width direction.
- a plurality of side land portions 28 partitioned by the two connecting grooves 24 and the circumferential grooves 14 are arranged in the tire circumferential direction.
- the size of the center small land portion 26 in the tire width direction gradually decreases toward both sides in the tire circumferential direction.
- a center lug groove 30 having a groove width narrower than the corrugated groove 20 and a shallow groove depth is formed to rise to the right in the center in the tire circumferential direction so as to cross the center small land portion 26.
- a plurality (six in this embodiment) of sipes 32 that cross the center small land portion 26 and are inclined in the direction opposite to the center lug groove 30 are formed.
- the groove depth of the center lug groove 30 is preferably in the range of 70 to 90% of the groove depth of the other part of the corrugated groove 20.
- center lug groove 30 By forming the center lug groove 30 shallower than the corrugated groove 20, water drainage between the center small land portion 26 and the road surface during running on a wet road surface can be suppressed while suppressing a decrease in rigidity of the center small land portion 26. Secured.
- the portion where the direction of the corrugated groove 20 is substantially the tire circumferential direction is connected to the connecting groove 24, and the wave
- a portion where the direction of the corrugated groove 20 is substantially the tire circumferential direction (the connecting portion between the third arc groove portion 20C and the fourth arc groove portion 20D). Nearby) and the connecting groove 24 are alternately connected in the tire circumferential direction, so that a groove continuous in the tire circumferential direction is formed, which contributes to an improvement in drainage in the tire circumferential direction.
- the groove width of the corrugated groove 20 is 7 to 15 mm, and the groove depth of the corrugated groove 20 is 10 mm.
- the corrugated groove 20 has a groove width gradually increasing toward the circumferential groove 14 at both longitudinal ends of the corrugated groove 20 in order to improve drainage performance to the circumferential groove 14, and in the vicinity of the tire equatorial plane CL.
- the groove width is formed narrow.
- the connecting groove 24 has a groove width of 12 mm and a groove depth of 10 mm
- the center lug groove 30 has a groove width of 4.5 mm and a groove depth of 10 mm.
- the corrugated groove 20 is formed with a raised portion 34 on the tire equatorial plane CL that shallows the groove bottom so as to connect the center small land portions 26 to each other.
- the height dimension of the bottom raised portion 34 is preferably in the range of 70 to 90% with respect to the groove depth dimension of the corrugated groove 20.
- the height of the bottom raised portion 34 in the present embodiment is 80% (8 mm) of the groove depth of the corrugated groove 20.
- the sipe 32 of the center small land portion 26 includes a first sipe portion 32A, a second sipe portion 32B extending in the same direction as the first sipe portion 32A, and a first sipe portion 32A.
- the second sipe portion 32B is connected to the first sipe portion 32A and the second sipe portion 32B intersects with the second sipe portion 32B.
- the sipe wall surfaces of the first sipe portion 32A, the second sipe portion 32B, and the connection portion 32C are planar, and the first sipe portion 32A and the second sipe portion 32B are arranged on the inner side in the tire radial direction (groove bottom) from the tread side. Inclined in directions opposite to each other so as to be gradually separated toward each other.
- the first sipe portion 32A and the second sipe portion 32B are separated from each other on the land surface, and the connecting portion 32C becomes longer.
- 4A shows the sipe 32 appearing on the tread of the center small land portion 26 when new
- FIG. 4B shows the sipe 32 appearing on the tread of the center small land portion 26 after wear. Has been. Since the connecting portion 32C on the tread becomes longer due to wear of the center small land portion 26, the edge component of the sipe 32 in the tire circumferential direction increases.
- the sipe 32 has a groove width that closes when grounded, and the groove width is preferably 0.5 to 1.0 mm, and 0.7 mm in this embodiment.
- a plurality of concave curved surfaces 36A are formed from the tread surface to the groove bottom at the tapered circumferential end portion of the tire facing the connecting groove 24 of the center small land portion 26 (in this embodiment).
- Two stepped inclined portions 36 are formed.
- 5B is a diagram in which the tire circumferential direction end of the center small land portion 26 is cross-sectional in a direction orthogonal to the land tread and orthogonal to the extending direction of the connecting groove 24.
- the tire circumferential direction end portion of the center small land portion 26 is a flat inclined surface 38 as shown by a two-dot chain line (a straight line in the sectional view)
- the stepped inclined portion 36 is formed by connecting a plurality of concave curved surfaces 36A as indicated by the solid line
- the surface area of the tire circumferential direction end portion of the center small land portion 26 is larger than that of the flat inclined surface 38.
- the stepped inclined portion 36 is larger.
- the virtual perpendicular line FL1 extending from the groove bottom side end portion P1 of the connecting groove 24 of the stepped inclined portion 36 toward the outer side in the tire radial direction and the center along the tread surface of the center small land portion 26 P2 is an intersection with the virtual extension line FL2 extending from the tread surface of the small land portion 26 to the connecting groove 24 side
- L is a distance from the end P3 on the tread surface side of the stepped inclined portion 36 to the intersection P2
- a stepped inclined portion 36 is a distance from the end P1 on the groove bottom side to the intersection P2
- D it is preferable that D ⁇ L.
- each curved surface 36A is formed by connecting a flat surface and an arc surface having a center of curvature on the outer side of the land portion (substantially J-shaped when viewed in cross section). : In each curved surface 36A, the dimension along the tread surface is smaller than the dimension in the tire radial direction.)
- the shape of the curved surface 36A is not limited to the shape shown in FIG. Also good.
- the stepped inclined portion 36 of the present embodiment has two curved surfaces 36A, but the stepped inclined portion 36 may have three or more curved surfaces 36A. (Side land) As shown in FIG. 2 and FIG. 6, a second lug groove 40 (first connecting groove of the present invention) connected to the circumferential groove 14 and the corrugated groove 20 is located near the center in the tire circumferential direction of the side small land portion 28. Is formed.
- the second lug groove 40 includes a thick groove portion 42 that terminates in the vicinity of the center in the land width direction from the circumferential groove 14 toward the tire equatorial plane CL, and a center in the land width direction from the corrugated groove 20 toward the outer side in the tire width direction.
- a narrow groove portion 44 extending to the vicinity and connected to the thick groove portion 42 is provided.
- the thick groove portion 42 of the present embodiment is inclined upward to the right and is formed shallower than the circumferential groove 14.
- the narrow groove portion 44 is narrower than the thick groove portion 42, the narrow groove portion 44 does not close even when the side small land portion 28 contacts the road surface and is compressed, and has a groove width so that drainage can be maintained. .
- sipes 32 having the same configuration as the center small land portion 26 are formed with a smaller number (two in the present embodiment) than the center small land portion 26.
- the sipe 32 of the side small land portion 28 is inclined upward to the left.
- the narrow groove portion 44 extends from the corrugated groove 20 toward the outer side in the tire width direction and connects the first portion 46 inclined to the right and the end portion of the first portion 46 and the end portion of the thick groove portion 42. And a second portion 48 extending substantially in the tire circumferential direction (inclined to the left).
- the first portion 46 and the second portion 48 correspond to the first bent portion of the present invention
- the second portion 48 and the thick groove portion 40 correspond to the second bent portion of the present invention. Yes.
- the side small land portion 28 has the first The first portion 46 and the second portion 48 form a first acute angle portion 50 (first corner portion of the present invention) having an acute angle shape in a tread plan view, and the second portion 48 and the thick groove portion. 42 forms a second acute angle portion 52 (second corner portion of the present invention) having an acute angle shape in plan view of the tread.
- the first acute angle portion 50 is formed to be larger than the second acute angle portion 52, and therefore, the first acute angle portion having lower rigidity than the second acute angle portion 52.
- a bottom raised portion 54 is formed in the second lug groove 40 in the narrow groove portion 44 facing the first acute angle portion 50 so that the narrow groove portion 44 is shallower than the thick groove portion 42.
- the bottom raised portion 54 extends from the narrow groove portion 44 to the end portion of the thick groove portion 42 so as to surround the first acute angle portion 50.
- the groove width of the thick groove portion 42 is 10.5 (average value) mm
- the groove depth of the thick groove portion 42 is 8 mm
- the groove width of the narrow groove portion 44 is 4 mm.
- a first chamfered portion 56A is formed at the acute angle tip portion of the first acute angle portion 50, and a second chamfered portion is formed at the acute angle tip portion of the second acute angle portion 52. 56B is formed.
- the side small land portion 28 of the present embodiment is formed with a stepped inclined portion 36 similar to the center small land portion 26 at the tapered end on the connection groove 24 side.
- a chamfer 56C is formed in the side small land portion 28 at the acute tip portion of the third acute angle portion 58 formed by the circumferential groove 14 and the corrugated groove 20, and formed by the circumferential groove 14 and the thick groove portion 42.
- a chamfer 56D is formed at the acute tip portion of the fourth acute angle portion 60 to be formed.
- the groove depth from the tread surface 28A of the side small land portion 28 to the groove bottom of the thick groove portion 42 is a
- the groove depth from the tread surface 28A of the side small land portion 28 to the bottom surface of the raised portion 54 is a
- the chamfer height is c
- the chamfering amount is d (a distance measured from the center of the boundary line between the tread surface 28A and the chamfer 56 to the acute tip portion along the tread surface 28A).
- the chamfering height c is smaller than the above range, the effect of increasing the rigidity of the land portion by the chamfered portion is reduced, and the chamfered portion is easily chipped.
- the shoulder land portion region 18 includes a first shoulder lug groove 62 extending from the circumferential groove 14 toward the outer side in the tire width direction, and a second shoulder lug groove extending outward from the land portion intermediate portion in the tire width direction.
- a shoulder lug groove 64, a notch 66 opening in the circumferential groove 14, a sipe 68 connecting the second shoulder lug groove 64 and the notch 66, and a sipe 74 extending in the tire circumferential direction are formed.
- the first shoulder lug groove 62 is formed with a narrow groove width at a part on the circumferential groove side, and a mountain-shaped bottom raised portion 70 is formed at a portion where the groove width is narrow.
- a mountain-shaped bottom raised portion 72 is also formed at an intermediate portion of the second shoulder lug groove 64.
- the pattern of the tread 12 of the pneumatic tire 10 of the present embodiment has a point-symmetric shape having a symmetric point on the tire equatorial plane CL.
- the pair of circumferential grooves 14 are provided in the tread 12, hydroplaning performance in wet conditions, lateral slip performance on rough roads, straight running stability, and the like are achieved. Can be secured.
- the circumferential groove 14 is preferably provided in a region of 10 to 40% of the ground contact width TW from the ground contact end 12E of the tread 12 to the tire equatorial plane CL side. If the circumferential groove 14 is provided in the region of less than 10% of the ground contact width TW from the ground contact end 12E to the tire equatorial plane CL side, the width of the shoulder land region 18 becomes too narrow, and the rigidity of the shoulder land region 18 is increased. Is lacking. On the other hand, if the circumferential groove 14 is provided in a region exceeding 40% of the ground contact width TW from the ground contact end 12E to the tire equatorial plane CL, the width of the center land region 16 becomes too narrow and the center land region 16 Insufficient rigidity.
- the corrugated grooves 20 extending with an amplitude in the direction inclined with respect to the tire equatorial plane CL are spaced apart in the tire circumferential direction. Since a plurality of openings are formed, water between the center land area 16 and the road surface can be efficiently drained toward the circumferential grooves 14 on both sides via the corrugated grooves 20, and the center land area 16 High drainage performance is ensured.
- the obliquely extending land portion 22 of the center land area 16 defined by the corrugated groove 20 has an edge that is inclined with respect to the tire width direction of the obliquely extending land portion 22 during traveling.
- the generation of noise (particularly the hitting sound) from the center land area 16 is suppressed during traveling.
- the center lug portion 30 shallower than the corrugated groove 20 is formed in the center small land portion 26 of the center land area 16, the water between the center small land portion 26 and the ground contact surface is centered. Drained into the corrugated grooves 20 on both sides via the lug grooves 30. Thereby, the rigidity of the center small land portion 26 can be ensured while improving the drainage of water between the center small land portion 26 and the road surface when traveling on a wet road surface.
- a bottom raised portion 34 is formed on the tire equatorial plane CL, and the adjacent center small land portions 26 are bottom raised portions. Since they are connected and supported at 34, the rigidity of the tread 12 in the vicinity of the tire equatorial plane CL is increased, and the steering stability is improved.
- the second lug portion 40 is formed in the side small land portion 28 of the center land area 16, the water between the side small land portion 28 and the ground contact surface passes through the second lug groove 40 and the corrugated groove 20 and the circumference. Drained into the directional groove 14. Thereby, the drainage of the water between the side small land part 28 and road surface at the time of wet road surface travel can be improved.
- the second lug groove 40 is formed in the side small land portion 28, the second lug groove 40 is formed shallower than the circumferential groove 14 and the corrugated groove 20, so that the side of the wet road surface traveling The rigidity of the side small land portion 28 can be ensured while improving the water drainage between the small land portion 28 and the road surface.
- the edge component in the tire width direction and the edge component in the tire circumferential direction are increased and the edge caught on the road surface is longer than in the case of the straight shape.
- the edge component in the tire width direction is effective for traction and braking
- the edge component in the tire circumferential direction is effective for cornering (lateral force).
- the side small land portion 28 is formed with the first acute angle portion 50 and the second acute angle portion 52, but the larger first acute angle portion.
- a bottom raised portion 54 is formed at the groove bottom around the two sides (two sides forming an acute angle) so as to be shallower than the thick groove portion 42, thereby ensuring the rigidity of the first acute angle portion 50. .
- the chamfer 56 is formed at the acute tip portion of the first acute portion 50 and the acute tip portion of the second acute portion 52 to reduce the ground pressure at the acute tip portion, the first acute angle caused by a stone or the like on the road surface is reduced. The occurrence of chipping in the portion 50 and the second acute angle portion 52 can be suppressed.
- the ground pressure on the acute front end side of the first acute angle portion 50 and the second acute angle portion 52 is reduced, so that the tires of the first acute angle portion 50 and the second acute angle portion 52 generated by stones or the like on the road surface. Since the amount of displacement in the width direction is reduced, it is possible to suppress cracks that are likely to occur from the groove bottom portion around the acute angle portion.
- the bottom raised portion 54 is not formed at the groove bottom adjacent to the two sides forming the acute angle of the second acute angle portion 52. However, the rigidity of the second acute angle portion 52 is sufficiently secured.
- the second acute angle portion 52 is relatively smaller than the first acute angle portion 50.
- the second acute angle portion 52 may be the same size as the first acute angle portion 50. It may be larger than one acute angle portion 50.
- the bottom raised portion 54 may be formed on the groove bottom adjacent to the two sides forming the acute angle of the second acute angle portion 52.
- the rigidity of the center small land portion 26 of the center land area 16 and the rigidity of the side small land portion 28 are ensured, that is, the tire width direction of the tread 12. Since the rigidity on the center side is ensured, high steering stability can be obtained.
- a stepped inclined portion 36 having a plurality of concave curved surface portions is formed at the end portion of the center small land portion 26 on the connecting groove 24 side and the end portion of the side small land portion 28 on the connecting groove 24 side. Therefore, since the area in contact with soil, snow, etc. increases more than a simple flat slope portion that is not stepped, it is possible to improve running performance on rough roads.
- the pneumatic tire 10 of the present embodiment exhibits the effect of the present invention by being mounted on, for example, a passenger car, a light truck, an RV car, etc. that travels on both paved roads and unpaved bad roads.
- the effect of the present invention can be exhibited even if it is mounted on a vehicle other than these.
- the circumferential groove 14 is provided in the region of less than 10% of the ground contact width TW from the ground contact end 12E to the tire equatorial plane CL side, the width of the shoulder land area 18 becomes too narrow, and the shoulder land The rigidity of the area 18 is insufficient.
- the circumferential groove 14 is provided in a region exceeding 40% of the ground contact width TW from the ground contact end 12E to the tire equatorial plane CL, the width of the center land region 16 becomes too narrow and the center land region 16 Insufficient rigidity. Therefore, it is preferable that the circumferential groove 14 be provided in a region of 10 to 40% of the ground contact width TW from the ground contact end 12E of the tread 12 toward the tire equatorial plane CL.
- the end of the corrugated groove 20 on the arrow A direction side of the first arcuate groove part 20A is opposite to the arrow A direction of the second arcuate groove part 20B. It is displaced to the tire equatorial plane CL side from the end portion on the side (displacement portion of claim 4). Further, the end of the fourth arc groove 20D opposite to the arrow A direction is displaced toward the tire equatorial plane CL from the end of the third arc groove 20C on the arrow A direction (claim 4). Displacement part).
- the end of the first arcuate groove 20A on the arrow A direction side, the end of the second arcuate groove 20B opposite to the arrow A direction, the end of the third arcuate groove 20C on the arrow A direction side, and the fourth The ends of the arc groove 20D opposite to the arrow A direction are each inclined upward.
- fifth acute angle portions 76 are formed on both sides of the tire equatorial plane in the middle portion in the tire circumferential direction, and the tire equatorial plane in the middle portion in the tire circumferential direction is formed in the side small land portion 28.
- a sixth acute angle portion 78 is formed on the side.
- the side along the substantially tire circumferential direction forming the fifth acute angle portion 76 of the center small land portion 26 is lowered toward the outer side in the tire width direction, and is substantially A planar first inclined surface 80 extending in the tire circumferential direction is formed.
- a side of the side small land portion 28 that forms the sixth acute angle portion 78 along the substantially tire circumferential direction is a planar second extending downward in the tire equatorial plane CL and extending substantially in the tire circumferential direction.
- An inclined surface 82 is formed.
- the angle ⁇ of the first inclined surface 80 with respect to the tire radial direction is preferably within a range of 10 to 30 °.
- the angle of the second inclined surface 82 with respect to the tire radial direction is preferably within the same range as the first inclined surface 80.
- the end of the first arcuate groove 20A and the end of the second arcuate groove 20B of the corrugated groove 20 are displaced in the tire width direction. And the second arcuate groove portion 20B are always in communication with each other even when the tread 12 contacts the road surface. Similarly, the end of the third arcuate groove 20C and the end of the fourth arcuate groove 20D of the corrugated groove 20 are displaced in the tire width direction. Even if the tread 12 contacts the road surface, it always communicates with the four circular groove portions 20D.
- the end of the first arc groove 20A and the end of the second arc groove 20B are connected.
- a narrow groove 86 that allows the first arc groove 20A and the second arc groove 20B to communicate with each other in the tire width direction is formed in the displaced portion, and between the third arc groove 20C and the fourth arc groove 20D.
- the third arcuate groove portion 20C and the fourth arcuate groove portion 20D are connected to the tire width at a portion where the end portion of the third arcuate groove portion 20C and the end portion of the fourth arcuate groove portion 20D are displaced.
- a narrow groove 86 is formed to communicate in the direction.
- the narrow groove 86 has the same groove depth as the other parts of the wave groove 20 (first arc groove 20A, second arc groove 20B, third arc groove 20C, and fourth arc groove 20D).
- the groove width is formed narrower than other portions of the corrugated groove 20.
- the pattern of the tread 12 of the present embodiment also has a point-symmetric shape having a symmetric point on the tire equatorial plane CL.
- the end of the first arc groove 20A and the end of the second arc groove 20B are displaced in the tire width direction, and the end of the third arc groove 20C and the end of the fourth arc groove 20D.
- the end portion of the first arc groove portion 20A and the end portion of the second arc groove portion 20B are connected by a narrow groove 86, and the end portion of the third arc groove portion 20C is connected to the end portion of the third arc groove portion 20C.
- the ends of the four arc grooves 20D are connected by the narrow grooves 86, the center small land portion 26 and the side small land portions 28 are connected to the end of the first arc groove portion 20A as compared with the first embodiment.
- the edge component of the second arc groove portion 20B, the edge component of the end portion of the third arc groove portion 20C, the edge component of the end portion of the fourth arc groove portion 20D, and the edge of the narrow groove 86 are increased. Yes.
- the fifth acute angle portion 76 of the center small land portion 26 and the sixth acute angle portion 78 of the side small land portion 28 are portions whose rigidity tends to decrease, but one side forming the acute angle of the fifth acute angle portion 76
- the first inclined surface 80 is formed on the first side
- the second inclined surface 82 is formed on one side forming the acute angle of the sixth acute angle portion 78, so that the fifth acute angle portion 76 and the sixth acute angle portion 78 of the sixth acute angle portion 78 are formed. Stiffness is improved.
- first inclined surface 80 and the second inclined surface 82 partially overlap when viewed in the tire circumferential direction, and the other portion of the corrugated groove 20 (first arc groove portion 20A, second The circular arc groove 20B, the third circular arc groove 20C, and the fourth circular arc groove 20D) are arranged opposite to each other in the tire circumferential direction through a narrow groove 86 having a narrower groove width than that in the tire circumferential direction during braking, traction, etc.
- the fifth acute angle portion 76 and the sixth acute angle portion 78 come into contact with each other and can support each other, which contributes to improving the rigidity of the center small land portion 26 and the side small land portion 28.
- the groove width of the narrow groove 86 In order for the fifth acute angle portion 76 and the sixth acute angle portion 78 to contact and support each other, it is preferable to set the groove width of the narrow groove 86 within a range of 2 to 3 mm. If the groove width of the narrow groove 86 is less than 2 mm, the drainage of the narrow groove 86 is insufficient and the meaning of providing the narrow groove 86 is lost. If the groove width of the narrow groove 86 exceeds 3 mm, the fifth acute angle portion 76 and the second 6 The acute angle portion 78 is not in contact.
- the end of the first arc groove 20A and the end of the second arc groove 20B are inclined with respect to the tire circumferential direction, and the narrow groove 86 is also inclined with respect to the tire width direction.
- the edge part and the edge of the narrow groove 86 have an edge component in the tire width direction and an edge component in the tire circumferential direction, and rough roads such as on snow and muddy ground than in the first embodiment due to the edge component in the tire width direction. Traction and braking performance can be improved, and the edge component in the tire circumferential direction makes it difficult for the pneumatic tire 10 to slip with respect to lateral force, and cornering performance can be improved as compared with the first embodiment. .
- each land portion and each groove are not limited to those described in the first embodiment and the second embodiment, and within the scope of the present invention.
- the shape, size, angle, etc. can be changed as appropriate.
- Tire of Example 1 The tire of the first embodiment described above.
- Tire of Comparative Example 1 In the tire of the first embodiment described above, the first chamfered portion 56A and the second chamfered portion 56B are not formed at the acute angle portion of the side small land portion 28, and the other configurations are the same. A tire similar to that of the first embodiment.
- Steering stability test method and evaluation / test location Bridgestone Proving Ground Driver: In-house test driver Test method: Sensory evaluation of straightness, lane changeability and cornering.
- the evaluation is an index display with Comparative Example 1 being 100, and the larger index value indicates the better performance.
- the tires of the comparative examples are mounted on the left front wheel and the right rear wheel, the tires of the examples are mounted on the left rear wheel and the right rear wheel, and after traveling on a rough road for 1600 km, the cracks and chips are visually observed. The number was counted (the number is the average value of the front and rear wheels)
- Tire of Example 1 The tire of the first embodiment described above.
- Tire of Comparative Example 2 A linear lug in which the second lug groove 40 of the side small land portion 28 of the first embodiment has a constant groove width (3 mm) and a groove depth of 8 mm as shown in FIG. Tire changed to groove 88.
- Drainability test method and evaluation method / Test location Bridgestone Proving Ground Accelerated hydroplaning road / driver: In-house test driver / Test method: Measures the speed of hydroplaning phenomenon while accelerating a straight road with a depth of 10 mm. Run three tires for each tire and calculate the average value.
- Evaluation shows an index display in which the reciprocal of the occurrence rate of the hydroplaning phenomenon of Comparative Example 2 is 100, and the larger index value indicates the better performance.
- Noise test method and evaluation method / test location Bridgestone Proving Ground Pattern noise evaluation path (smooth road surface)
- Driver In-house test driver
- Test method Sound pressure near the left ear of the vehicle driver evaluated by a sound level meter.
- Evaluation is an index display in which the reciprocal of the sound pressure of Comparative Example 2 is 100, and the larger index value indicates the better performance.
- Wet brake performance test method and evaluation method / Test location Bridgestone Proving Ground Asphalt Road / Driver: In-house test driver / Test method: Measure the braking stop distance 5 times at a water depth of 2 mm and an initial speed of 80 km / h, and calculate the average value.
- Evaluation shows an index display in which the reciprocal of the braking stop distance of Comparative Example 2 is set to 100, and the larger index value indicates the better performance.
- Example 3 In order to confirm the effect of the pneumatic tire of the present invention, one type of pneumatic tire according to a comparative example and two types of pneumatic tires of the examples to which the present invention was applied were prototyped, steering stability, drainage performance, A comparison was made for noise and traction.
- Tire of Example 1 The tire of the first embodiment described above.
- Tire of Example 2 The tire of the second embodiment described above.
- Tire of Comparative Example 3 A tire having the pattern shown in FIG.
- the pneumatic tire 100 of Comparative Example 3 includes circumferential grooves 104 on both sides of the tire equatorial plane CL of the tread 102, and a center land portion between the circumferential grooves 104 and 104.
- a plurality of arc-shaped inclined grooves 108 extending from the circumferential groove 104 toward the tire equatorial plane CL and terminating in front of the tire equatorial plane CL are formed in the region 106 in the tire circumferential direction.
- a second land portion 114 is defined on the area 112 and on both sides thereof.
- a plurality of lug grooves 116 that are shallower than the inclined groove 108 are formed in the center land area 112, and a bottom raised portion 118 is formed in the lug groove 116.
- a plurality of sipes 120 are formed in the center land area 112.
- a tapered portion 122 is formed on both sides of the tire equator plane CL by the inclined groove 108 and the narrow groove 110, and an inclined surface 124 composed of a plurality of arc surfaces is formed in the tapered portion 122.
- the second land portion 114 is formed with a small inclined groove 126 which is inclined in substantially the same direction as the inclined groove 108 and extends from the circumferential groove 104 to the center portion of the land portion and terminates in the land portion.
- the small inclined groove 126 is formed with a bottom raised portion 128 on the circumferential groove side.
- a plurality of sipes 130 that are inclined in the direction opposite to the small inclined grooves 126 are formed.
- the second small land portion 114 is formed with an inclined surface 132 extending in the tire circumferential direction and inclined toward the tire equatorial plane on the tire equatorial plane side of the inclined groove 108.
- a shoulder land portion 136 defined by the circumferential groove 104 and a lug groove 134 extending from the circumferential groove 104 to the outer side in the tire width direction is disposed.
- a small lug groove 138, a small lug groove 140, and a sipe 142 are formed in the shoulder land portion 136.
- reference numeral 102 denotes a ground terminal.
- Example 2 the wet brake performance is improved as compared with Example 1 because the corrugated groove is displaced in the tire width direction in the middle portion and the edge component is increased in the center land region.
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Abstract
Description
前記センター陸部域にタイヤ周方向に間隔を開けて形成され、タイヤ赤道面の一方側の前記周方向溝と他方側の周方向溝とを連結し、タイヤ赤道面に対して傾斜する方向に振幅を持って延びる複数の波型溝と、を備え、互いにタイヤ周方向に隣接する一方の波型溝のタイヤ幅方向一方側に凸となる山部分と、タイヤ周方向に隣接する他方の波型溝のタイヤ幅方向他方側に凸となる山部分とが互いに向き合うように前記複数の波型溝が前記センター陸部域に配置されることで、前記センター陸部域には、前記波型溝の延び方向両側に向かうにしたがってタイヤ幅方向寸法が大小交互に変化する複数の斜め方向延在陸部分がタイヤ周方向に複数区画されており、前記斜め方向延在陸部分の内で前記周方向溝に隣接し、かつ前記周方向溝と前記波型溝とで挟まれる側方小陸部分には、前記周方向溝と前記波型溝とをタイヤ幅方向に連結し、第1の方向へ折曲する第1折曲部分と前記第1の方向とは異なる方向へ折曲する第2折曲部分を中間部分に備えた第1の連結溝が形成され、
前記第1の連結溝の溝底には、前記第1折曲部分によって前記側方小陸部分に形成された第1の角部、及び前記第2折曲部分によって前記側方小陸部分に形成された第2の角部の少なくとも一方に連結される底上げ部が形成され、前記第1の角部には第1の面取り部が形成され、前記第2の角部には第2の面取り部が形成されている。
(1) トレッドのセンター陸部域に、タイヤ赤道面に対して傾斜する方向に振幅を持って延びる波型溝を、周方向溝の連結する様にタイヤ周方向に間隔を開けて複数形成することで、センター陸部域と路面との間の水を、波型溝を介して両側の周方向溝へ向けて効率的に排水でき、センター陸部域において高い排水性が確保されている。
(2) 波型溝で区画された斜め方向延在陸部分には、タイヤ幅方向に延びるエッジが無いため、走行時に斜め方向延在陸部分のエッジは路面に徐々に接することとなり、ノイズ(特に打撃音)の発生が抑えられる。
(3) このセンター陸部域では、互いに隣接する一方の斜め方向延在陸部分の幅狭部分には、他方の斜め方向延在陸部の幅広部分が配置され、斜め方向延在陸部分の幅狭部分と斜め方向延在陸部の幅広部分とが交互に配置されるので、センター陸部域全体の剛性を略均一にすることができる。
(4) 斜め方向延在陸部分の内で、周方向溝に隣接し、かつ周方向溝と波型溝とで挟まれる側方小陸部分には、周方向溝と波型溝とをタイヤ幅方向に連結する第1の連結溝が形成されているので、側方小陸部分と接地面との間の水は、第1の連結溝を介して周方向溝及び波型溝へ排水される。
(5) 第1の連結溝の溝底には、第1折曲部分によって側方小陸部分に形成された第1の角部、及び第2折曲部分によって側方小陸部分に形成された第2の角部の少なくとも一方に連結される底上げ部が形成されているので、底上げ部が第1の角部、及び第2の角部の少なくとも一方の補強となって、第1の角部、及び第2の角部の少なくとも一方の剛性を向上させることができる。第1の角部、及び第2の角部が、各々鋭角形状である場合、底上げ部によって高い補強効果が得られる。
以下、図面を参照して本発明の第1の実施形態に係る空気入りタイヤ10を説明する。
なお、本実施形態の空気入りタイヤ10のタイヤサイズは、PSR 275/70R16 114Sである。
(センター陸部域)
図1、及び図2に示すように、センター陸部域16には、図面左側の周方向溝14と図面右側の周方向溝14とを連結するように、タイヤ周方向に対して傾斜する方向へ振幅を有しながら延びる波型溝20がタイヤ周方向に複数形成されている。本実施形態の波型溝20は、全体的に右上がりに傾斜して延びているが、全体的に左上がりに傾斜して延びていても良い。
(サイプ)
図3、及び図4Aに示すように、センター小陸部分26のサイプ32は、第1サイプ部分32A、第1サイプ部分32Aと同方向に延びる第2サイプ部分32B、及び第1サイプ部分32Aと第2サイプ部分32Bとを連結し、第1サイプ部分32A及び第2サイプ部分32Bと交差する連結部分32Cで構成されている。第1サイプ部分32A、第2サイプ部分32B、及び連結部分32Cの各サイプ壁面は平面状であり、第1サイプ部分32Aと第2サイプ部分32Bとは、踏面側からタイヤ径方向内側(溝底側)に向けて徐々に離間するように、互いに反対方向に傾斜している。
(段付き傾斜部)
センター小陸部分26の連結溝24に面する先細りのタイヤ周方向端部には、図5A,図5Bに示すように、凹状の曲面36Aを踏面から溝底に向けて複数(本実施形態では2個)連ねた段付き傾斜部36が形成されている。なお、図5Bは、センター小陸部分26のタイヤ周方向端部を、陸部踏面に対して直交すると共に、連結溝24の延び方向に対して直交する方向に断面とした図である。
(側方小陸部分)
図2、及び図6に示すように、側方小陸部分28のタイヤ周方向中央付近には、周方向溝14と波型溝20と連結するセカンドラグ溝40(本発明の第1連結溝)が形成されている。
(ショルダー陸部域)
図2に示すように、ショルダー陸部域18には、周方向溝14からタイヤ幅方向外側へ向けて延びる第1ショルダーラグ溝62、陸部中間部分からタイヤ幅方向外側へ向けて延びる第2ショルダーラグ溝64、周方向溝14に開口する切欠部66、第2ショルダーラグ溝64と切欠部66とを連結するサイプ68、タイヤ周方向に延びるサイプ74が形成されている。
(作用)
(1) 本実施形態の空気入りタイヤ10では、トレッド12に一対の周方向溝14を設けているので、ウエット時でのハイドロプレーニング性能、悪路等での横すべり性能、及び直進安定性等を確保することができる。
(2) トレッド12のタイヤ赤道面CLに沿って配置されるセンター陸部域16に、タイヤ赤道面CLに対して傾斜する方向に振幅を持って延びる波型溝20をタイヤ周方向に間隔を開けて複数形成しているので、センター陸部域16と路面との間の水を、波型溝20を介して両側の周方向溝14へ向けて効率的に排水でき、センター陸部域16において高い排水性能が確保されている。
(3) 波型溝20で区画されたセンター陸部域16の斜め方向延在陸部分22は、走行時に斜め方向延在陸部分22のタイヤ幅方向に対して傾斜するエッジが路面に徐々に接するため、走行時、センター陸部域16からのノイズ(特に打撃音)の発生が抑えられる。
(4) センター陸部域16のセンター小陸部分26には波型溝20よりも浅いセンターラグ溝30が形成されているので、センター小陸部分26と接地面との間の水は、センターラグ溝30を介して両側の波型溝20へ排水される。これにより、ウエット路面走行時のセンター小陸部分26と路面との間の水の排水性を向上しつつ、センター小陸部分26の剛性を確保することができる。
(5) 側方小陸部分28にセカンドラグ溝40が形成されているが、セカンドラグ溝40は、周方向溝14、及び波型溝20よりも浅く形成されているので、ウエット路面走行時の側方小陸部分28と路面との間の水の排水性を向上しつつ、側方小陸部分28の剛性を確保することができる。
(6) センター小陸部分26の連結溝24側の端部、及び側方小陸部分28の連結溝24側の端部には、凹状の曲面部を複数有する段付き傾斜部36が形成されているため、段付きとなっていない単なる平面状の傾斜部よりも土、雪等に接触する面積が増えるため、悪路での走行性能を向上することができる。
(7) ショルダー陸部域18では、第1ショルダーラグ溝62、及び第2ショルダーラグ溝64によって、接地面の水をタイヤ幅方向外側へ排水することができる。また、第1ショルダーラグ溝62は、周方向溝14に接続されているので、周方向溝14の一部の水をタイヤ幅方向外側へ排水することができる。
(8) 本実施形態のトレッド12のパターンは、点対称形状であるため、回転方向の指定は無く、タイヤのローテーションを自由に行うことができる。
(9) なお、周方向溝14が接地端12Eからタイヤ赤道面CL側へ接地幅TWの10%未満の領域に設けられていると、ショルダー陸部域18の幅が狭くなり過ぎ、ショルダー陸部域18の剛性が不足する。一方、周方向溝14が、接地端12Eからタイヤ赤道面CL側へ接地幅TWの40%を越える領域に設けられると、センター陸部域16の幅が狭くなり過ぎ、センター陸部域16の剛性が不足する。したがって、周方向溝14は、トレッド12の接地端12Eからタイヤ赤道面CL側へ、接地幅TWの10~40%の領域内に設けることが好ましい。
[第2の実施形態]
次に、本発明の第2の実施形態に係る空気入りタイヤ10を図8、及び図9にしたがって説明する。なお、第1の実施形態と同一構成には同一符合を付し、その説明は省略する。
(作用)
本実施形態では、第1円弧溝部20Aの端部と第2円弧溝部20Bの端部とをタイヤ幅方向に変位させていると共に、第3円弧溝部20Cの端部と第4円弧溝部20Dの端部とをタイヤ幅方向に変位させており、更に、第1円弧溝部20Aの端部と第2円弧溝部20Bの端部とを細溝86で連結し、第3円弧溝部20Cの端部と第4円弧溝部20Dの端部とを細溝86で連結しているので、センター小陸部分26、及び側方小陸部分28には、第1の実施形態に比較して、第1円弧溝部20Aの端部のエッジ成分、第2円弧溝部20Bの端部のエッジ成分、第3円弧溝部20Cの端部のエッジ成分、第4円弧溝部20Dの端部のエッジ成分、及び細溝86のエッジが増えている。
(試験例1)
本発明の空気入りタイヤの効果を確かめるために、比較例に係る空気入りタイヤと、本発明の適用された実施例の空気入りタイヤとを試作し、実地走行後のセカンド小陸部分の亀裂、及び欠けの発生個数、及び操縦安定性について試験を行った。
・試験場所:ブリヂストンプルービンググラウンド
・ドライバー:社内テストドライバー
・試験方法:直進性、レーンチェンジ性、コーナリング性を官能評価。
(試験例2)
本発明の空気入りタイヤの効果を確かめるために、比較例に係る空気入りタイヤ1種と、本発明の適用された実施例の空気入りタイヤ1種とを試作し、操縦安定性、排水性、ノイズ、及びウエットブレーキ性能について比較を行った。
・試験場所:ブリヂストンプルービンググラウンド
加速ハイドロプレーニング路
・ドライバー:社内テストドライバー
・試験方法:水深10mmの直線路を加速しながらハイドロプレーニング現象の発生速度を計測。各タイヤで3個実施し、平均値を算出。
・試験場所:ブリヂストンプルービンググラウンド
パターンノイズ評価路(平滑路面)
・ドライバー:社内テストドライバー
・試験方法:騒音計により評価車両運転手左耳近傍の音圧を計測。
・試験場所:ブリヂストンプルービンググラウンド
アスファルト路
・ドライバー:社内テストドライバー
・試験方法:水深2mm、初速80km/hで制動停止距離を5回計測し平均値を算出。
(試験例3)
本発明の空気入りタイヤの効果を確かめるために、比較例に係る空気入りタイヤ1種と、本発明の適用された実施例の空気入りタイヤ2種とを試作し、操縦安定性、排水性、ノイズ、及びトラクションについて比較を行った。
12 トレッド
14 周方向溝
16 センター陸部域
20 波型溝
22 斜め方向延在陸部分
24 連結溝(第2の連結溝)
26 センター小陸部分
28 側方小陸部分
36 段付き傾斜部
36A 曲面(凹状の曲面部)
34 底上げ部
36 傾斜部
40 セカンドラグ溝(第1の連結溝)
42 太溝部(第2折曲部分)
46 第1の部分(第1折曲部分)
48 第2の部分(第1折曲部分、第2折曲部分)
50 第1の鋭角部分(第1の角部)
52 第2の鋭角部分(第2の角部)
56A 第1の面取り部
56B 第2の面取り部
Claims (4)
- トレッドのタイヤ赤道面の両側に配置される周方向溝で区画されるセンター陸部域と、
前記センター陸部域にタイヤ周方向に間隔を開けて形成され、タイヤ赤道面の一方側の前記周方向溝と他方側の周方向溝とを連結し、タイヤ赤道面に対して傾斜する方向に振幅を持って延びる複数の波型溝と、を備え、
互いにタイヤ周方向に隣接する一方の波型溝のタイヤ幅方向一方側に凸となる山部分と、タイヤ周方向に隣接する他方の波型溝のタイヤ幅方向他方側に凸となる山部分とが互いに向き合うように前記複数の波型溝が前記センター陸部域に配置されることで、前記センター陸部域には、前記波型溝の延び方向両側に向かうにしたがってタイヤ幅方向寸法が大小交互に変化する複数の斜め方向延在陸部分がタイヤ周方向に複数区画されており、
前記斜め方向延在陸部分の内で前記周方向溝に隣接し、かつ前記周方向溝と前記波型溝とで挟まれる側方小陸部分には、前記周方向溝と前記波型溝とをタイヤ幅方向に連結し、第1の方向へ折曲する第1折曲部分と前記第1の方向とは異なる方向へ折曲する第2折曲部分を中間部分に備えた第1の連結溝が形成され、
前記第1の連結溝の溝底には、前記第1折曲部分によって前記側方小陸部分に形成された第1の角部、及び前記第2折曲部分によって前記側方小陸部分に形成された第2の角部の少なくとも一方に連結される底上げ部が形成され、
前記第1の角部には第1の面取り部が形成され、
前記第2の角部には第2の面取り部が形成されている、空気入りタイヤ。 - 前記タイヤ周方向に隣接する一方の波型溝におけるタイヤ幅方向一方側に凸となる一方の山部分と、前記タイヤ周方向に隣接する他方の波型溝における前記一方の山部分に向けて凸となる他方の山部分と、を連結する第2の連結溝が前記センター陸部域に形成されることで、前記斜め方向延在陸部分には、タイヤ赤道面上に、前記第2の連結溝を介して前記側方小陸部分と隔てられるセンター小陸部分が形成され、
前記センター小陸部分の前記第2連結溝側の端部、及び前記側方小陸部分の前記第2の連結溝側の端部には、タイヤ踏面に対して直角かつ前記第2連結溝と直交する断面で見た時に、凹状の曲面部が踏面から溝底に向けて複数連結され、陸部踏面から溝底に向けて下がるように傾斜した段付き傾斜部が形成されている、請求項1に記載の空気入りタイヤ。 - 前記段付き傾斜部の溝底側の端部からタイヤ径方向外側へ向けて延ばした仮想垂線と、陸部踏面からに陸部踏面に沿って溝側へ延ばした仮想延長線との交点をPとした時に、前記傾斜部の陸部踏面側の端部から前記交点Pまでの距離Lが、前記傾斜部の溝底側の端部から前記交点Pまでの距離Dよりも小さく設定されている、請求項2に記載の空気入りタイヤ。
- 前記波型溝が長手方向中間部分にタイヤ幅方向に変位された変位部を有することで、前記センター陸部域には、前記変位部において少なくともタイヤ幅方向のエッジ成分が増加されている、請求項1~請求項3の何れか1項に記載の空気入りタイヤ。
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JP2012536271A JP5674800B2 (ja) | 2010-09-30 | 2011-07-25 | 空気入りタイヤ |
AU2011309648A AU2011309648B2 (en) | 2010-09-30 | 2011-07-25 | Pneumatic tyre |
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US20150290977A1 (en) * | 2014-04-14 | 2015-10-15 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
WO2015163157A1 (ja) * | 2014-04-22 | 2015-10-29 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP2015202777A (ja) * | 2014-04-14 | 2015-11-16 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP2016132441A (ja) * | 2015-01-22 | 2016-07-25 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP2016222208A (ja) * | 2015-06-03 | 2016-12-28 | 株式会社ブリヂストン | 空気入りタイヤ |
JP2016222204A (ja) * | 2015-06-03 | 2016-12-28 | 株式会社ブリヂストン | 空気入りタイヤ |
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JP2017178170A (ja) * | 2016-03-31 | 2017-10-05 | 横浜ゴム株式会社 | 空気入りタイヤ |
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US11654723B2 (en) | 2021-04-08 | 2023-05-23 | Sumitomo Rubber Industries, Ltd. | Tire |
EP4070973A1 (en) * | 2021-04-08 | 2022-10-12 | Sumitomo Rubber Industries, Ltd. | Tire |
EP4140776A1 (de) * | 2021-08-30 | 2023-03-01 | Continental Reifen Deutschland GmbH | Fahrzeugluftreifen |
Also Published As
Publication number | Publication date |
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JP5674800B2 (ja) | 2015-02-25 |
RU2519327C1 (ru) | 2014-06-10 |
CN103140360A (zh) | 2013-06-05 |
JPWO2012043036A1 (ja) | 2014-02-06 |
CN103140360B (zh) | 2015-06-24 |
AU2011309648A1 (en) | 2013-05-02 |
AU2011309648B2 (en) | 2015-02-05 |
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