WO2014167859A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2014167859A1 WO2014167859A1 PCT/JP2014/002056 JP2014002056W WO2014167859A1 WO 2014167859 A1 WO2014167859 A1 WO 2014167859A1 JP 2014002056 W JP2014002056 W JP 2014002056W WO 2014167859 A1 WO2014167859 A1 WO 2014167859A1
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- WIPO (PCT)
- Prior art keywords
- tire
- groove
- width direction
- recess
- wall surface
- 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
- B60C11/0327—Tread patterns characterised by special properties of 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
- B60C11/0302—Tread patterns directional pattern, i.e. with main rolling 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
- B60C11/0306—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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential 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
- 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
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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
- B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane
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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
- B60C2011/0383—Blind or isolated grooves at the centre of the tread
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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
- B60C2011/0386—Continuous ribs
- B60C2011/0388—Continuous ribs provided at the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
- B60C2011/133—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising recesses
Definitions
- the present invention relates to a pneumatic tire capable of promoting heat dissipation of the tread portion and lowering the temperature of the tread portion.
- an object of the present invention is to provide a pneumatic tire that minimizes an increase in groove area, promotes heat dissipation in the tread portion, and lowers the temperature of the tread portion.
- the pneumatic tire of the present invention is a tire having a circumferential groove formed on a tread surface and a plurality of widthwise grooves having a groove width wider than the circumferential groove.
- a concave recess is formed toward the circumferential groove, and the opening surface in which the widthwise groove opens into the circumferential groove opens the recess into the circumferential groove.
- the width direction groove is opposed to at least a part of the opening surface of the recess, and extends at an angle of 30 ° or more with respect to the tire width direction. According to this, heat is dissipated in the vicinity of the intermediate point M of the circumferential groove adjacent to the width direction groove in the tire circumferential direction, and the temperature of the tread portion can be lowered.
- the “recess opening surface” refers to a virtual surface that extends the circumferential groove wall surface along the surface and covers the recess from the tire width direction.
- the state that “the opening surface of the widthwise groove faces at least a part of the opening surface of the recessed portion of the recess” means that the opening surface of the widthwise groove is parallel to the extending direction of the widthwise groove. It is a state in which at least a part of the concave opening surface is present in a region formed by projecting on the circumferential groove wall surface provided with the concave in any direction.
- the length of the concave portion in the tire width direction changes along the tire circumferential direction. According to this, the temperature of the tread portion can be further lowered.
- the length of the recess in the tire circumferential direction decreases from the recess opening surface side of the recess toward the back. According to this, the temperature of the tread portion can be further lowered.
- the concave portion has an asymmetric planar shape with respect to a virtual line parallel to the tire width direction when viewed from the tread surface. According to this, the temperature of the tread portion can be sufficiently lowered.
- the concave portion includes a concavely inclined wall surface and a concavely inclined wall surface having a larger inclination angle with respect to the concave opening surface than the concavely inclined wall surface, and the widthwise groove is It is preferable that the recess extends from the opening surface of the widthwise groove toward the outer side in the tire width direction from the concavely inclined wall surface side toward the concavely inclined wall surface side. According to this, the temperature of the tread portion can be lowered more sufficiently.
- the width direction groove is inclined with respect to the tire width direction as described above, of the pair of groove wall surfaces of the width direction groove, an extended surface of the groove wall surface on the concavely steeply inclined wall surface side, It is preferable to coincide with the concavely inclined wall surface. According to this, the temperature of the tread portion can be further sufficiently lowered.
- FIG. 2A is an enlarged development view showing the vicinity of a concave portion of the tire in FIG. 1.
- B is the expansion development view which showed the tire of Drawing 1 with the flow of the air in each slot at the time of tire rolling.
- FIG. 3 is an enlarged perspective view showing an air flow in each groove when the tire of FIG. 1 is rolled in a direction opposite to that of FIG.
- A) is a comparative example tire in which the widthwise grooves of the tire of FIG. 1 are extended in the tire width direction
- (b) is a comparative example tire, the tire of (a).
- FIG. 2 is a tire width direction cross-sectional view illustrating the tire internal structure of the embodiment of the tire of FIG. 1.
- FIG. 1 is a developed plan view showing a tread pattern of a pneumatic tire 1 (also simply referred to as “tire”) for a construction vehicle according to an embodiment of the present invention.
- the tread tread surface 2 of the tire 1 is provided with at least one continuous groove 3 extending in the tire circumferential direction, in the figure, a pair of circumferential grooves 3 across the tire equatorial plane CL. ing.
- channel 3 has shown the extended form extended continuously linearly along a tire circumferential direction, it can be made into arbitrary extended forms, such as a zigzag form and a wave form. .
- the tread tread 2 has a plurality of widthwise grooves 4 that are open in the circumferential grooves 3 and wider than the circumferential grooves 3, and in the drawing, linearly open at the tread ends TE. Is formed. Accordingly, in FIG. 1, a rib-shaped central land portion 21 including the tire equatorial plane CL is formed by the pair of circumferential grooves 3, and a block-shaped land portion 22 is formed by the circumferential grooves 3 and the width-direction grooves 4.
- the illustrated tread pattern is an example, and the present invention can be applied to both the rib base pattern and the block base pattern.
- width direction groove 4 is not constant and changes in groove width, has an arbitrarily extending shape such as a zigzag shape or a wave shape, or communicates with other grooves without opening at the tread end TE, for example. It can be set as arbitrary forms.
- FIG. 3 In the tire 11 in which the narrow circumferential groove 13 and the wide width groove 14 extending in the direction parallel to the tire width direction and opening in the circumferential groove 13 are formed, FIG. As shown in FIG. 3, the tire 11 rolls to generate an air flow from the width direction groove 14 to the circumferential direction groove 13, but the width direction groove 14 extends in a direction parallel to the tire width direction as shown in the figure.
- the air flow in the width direction groove 14 collides with the circumferential groove wall surface of the circumferential groove 13 facing the width direction groove 14, and the air flow is forward FD (downward in FIG. 4) with respect to the tire rotation direction. And distributed in an amount approximately equal to the reverse direction OD (upward in FIG. 4). And the airflow from each of the width direction grooves 14 adjacent to each other in the tire circumferential direction collides at the intermediate point M. Therefore, since the air flow is stagnant at the intermediate point M, the vicinity of the intermediate point M cannot be sufficiently dissipated, and as a result, the temperature of the tread portion cannot be sufficiently reduced.
- a circumferential groove is formed on the circumferential groove wall surface W1 of the circumferential groove 3 (in the drawing, the circumferential groove wall surface on the tire equatorial plane CL side).
- a concave recess 5 is formed, and the opening 4 a that the widthwise groove 4 opens to the circumferential groove wall surface W ⁇ b> 2 of the circumferential groove 3 (in the drawing, the circumferential groove wall surface on the outer side in the tire width direction) 5 is opposed to at least a part of the concave opening surface 51 that opens to the circumferential groove 3.
- the illustrated recess 5 is also opened in the tread surface 2. According to this configuration, as shown in FIG.
- the air flow flowing into the circumferential groove 3 from the width direction groove 4 can be unevenly dispersed in the circumferential groove 3 by the recess 5. it can. Therefore, the point M ′ where the air flow in the forward direction FD and the reverse direction OD collide with each other in the circumferential groove 3 moves to the width direction groove 4 side as compared with the case where the concave portion 5 is not provided, and the intermediate point Since the air flow reaches M, the vicinity of the point M dissipates more heat, and as a result, the temperature of the tread portion can be sufficiently reduced.
- the moved point M ′ is less likely to dissipate heat due to the air flow, but is located in the vicinity of the width direction groove, so that the temperature of the tread portion can be lowered as compared with the case where the point M ′ is located at the intermediate point M. .
- the recess 5 is adjacent to the recess opening surface 51 along the circumferential groove wall surface W1 in which the recess 5 is formed and the circumferential groove wall surface W1 of the recess 5. It has a concave wall surface W3 and a concave wall surface W4, and two virtual corners having respective angles ⁇ 3 and ⁇ 4 by the concave opening surface 51 and the concave wall surface W3, and the concave opening surface 51 and the concave wall surface W4. A3 and A4 are formed.
- the recessed part 5 can be made into arbitrary shapes, As shown to Fig.2 (a), it is preferable that the length W of a tire width direction changes along a tire circumferential direction, and the example shown in figure Then, the length W of the recess 5 gradually increases from the corner A3 on one side in the tire circumferential direction to the apex T of the recess 5, and the length W gradually decreases from the apex T to the corner A4 on the other side in the tire circumferential direction. .
- the recess 5 preferably has a tire circumferential length L that decreases from the recess opening surface 51 side opening in the circumferential groove 3 toward the back, and toward the apex T in the drawing.
- the length L is the maximum at the recess opening surface 51 and decreases toward the vertex T.
- the recess 5 preferably has a maximum length in the tire circumferential direction of 150 mm or less and a maximum length in the tire width direction of 50 mm or less. If the recess 5 is too large, the wear performance may be deteriorated, and if it is too small, the air flow in the circumferential groove 3 may be insufficiently dispersed.
- the recess 5 shown in FIG. 2 described above has a triangular shape in which the angles ⁇ 3 and ⁇ 4 of the corners A3 and A4 respectively satisfy ⁇ 3> ⁇ 4, but the recess 5 is not shown.
- the recessed part 5 sees from a tread surface, it is preferable to have an asymmetric planar shape with respect to the virtual line parallel to a tire width direction.
- the recess wall surface W3 adjacent to the recess opening surface 51 as shown in FIG. , W4 is a virtual surface existing on a line segment that connects the position (vertex T) farthest away from the recessed opening surface 51 and one end of the recessed opening surface 51.
- the recessed part 5 should just be provided in at least one part among the groove wall surfaces of the circumferential groove
- the recess 5 on the groove wall surface from the groove bottom to the tread surface 2.
- the recessed part 5 is arrange
- the widthwise grooves 4 extend outward in the tire width direction at an angle of 30 ° or more with respect to the tire width direction.
- the width direction groove 4 is inclined and the tire circumferential direction in which the width direction groove 4 is inclined when viewed from the opening surface 4a of the width direction groove 4 to the outside in the tire width direction (hereinafter also referred to as “inclination direction of the width direction groove 4”). 2), when the tire 1 rolls, as shown in FIG. 2 (b), air flows from the width direction groove 4 into the circumferential direction groove 3, and the air flow is inclined.
- FIG. 2 Compared with the tire (FIG.
- the downward air flow from the opening side to the tread surface 2 of the circumferential groove 3 toward the groove bottom side causes a point P around the circumferential groove 3 as shown in FIG. 3. Therefore, the point P can be radiated effectively.
- the angle ⁇ 5 of the width direction groove 4 is set to 30 ° or more, as shown in the figure, a small air vortex is generated in the circumferential groove 3 and the downdraft flows over the vortex. Compared to the case of less than 30 °, the descending airflow can be made stronger. Therefore, the air flows into the width direction groove 4 while effectively cooling the point P, and even if the tire 1 rolls in a direction opposite to the inclination direction of the width direction groove 4, the temperature of the tread portion is increased. Can be reduced.
- the angle ⁇ 5 can be any angle as long as it is 30 ° or more, but if ⁇ 5 is excessively increased, the rigidity of the land portion provided with the widthwise grooves 4 may be reduced. It is preferable to satisfy the angle ⁇ ⁇ ⁇ 5 ⁇ 60 °.
- the concave portion 5 has a concavely inclined wall surface (concave wall surface) W4 having a relatively small inclination angle with respect to the extending direction of the circumferential groove 3, and a circumferential groove than the concavely inclined wall surface W4.
- 3 is provided with a recess steeply inclined wall surface (recessed wall surface) W3 having a relatively large inclination angle with respect to the extending direction of 3
- the width direction groove 4 extends from the concavely inclined wall surface W4 side toward the recessed steeply inclined wall surface W3 side. It is preferable to extend outward from the opening surface 4a of the width direction groove 4 in the tire width direction. According to this, since the airflow flowing from the width direction groove 4 to the circumferential direction groove 3 or from the circumferential direction groove 3 to the width direction groove 4 can be made smoother, the temperature of the tread portion is efficiently reduced. be able to.
- channel 4 inclines from the opening surface 4a of the width direction groove
- the extension surface of the groove wall surface W5 on the concave steeply inclined wall surface W3 side of the pair of groove wall surfaces of the width direction groove 4 coincides with the concavely steeply inclined wall surface W3. According to this, the air flow becomes sufficiently smooth, and the temperature of the tread portion can be further efficiently reduced.
- the position (vertex T) which becomes deepest from the recessed part opening surface 51 of the recessed part 5 is an angle rather than corner
- the corner A3 may be located between the ends R3 and R4, and the corner A4 may be located on the opposite side OD from the end R4.
- the corner A3 is located at the end R3.
- it is preferable that the corner A4 is located farther from the corner A3 than the end R4. This is because the air flow can be further sufficiently smoothed.
- the negative ratio of the tread tread 2 is 1/4 of the length of the entire tread measured from the tire equatorial plane CL along the tire width direction. It is preferable that the negative rate in the range (center portion) up to the separated position is lower than the negative rate in the range (shoulder portion) from the separated position to the tread end TE. This is because the rigidity of the center portion can be maintained.
- the groove width of the circumferential groove 3 is preferably 3 to 20 mm because air flow is obstructed if it is too narrow, and rigidity may be lowered if it is too wide.
- the circumferential groove 3 is 1/12 to 1/4 of the length in the tread width direction (with a tread width of about 1200 mm, a range of about 100 mm to 300 mm), and is spaced from the tire equatorial plane CL to the outside in the tire width direction. Are preferably located.
- the rigidity of the center portion can be maintained while lowering the temperature of the tread portion, particularly the center portion where the temperature rise is large due to tire rolling.
- the groove width of the width direction groove 4 is preferably 5 to 120 mm because air flow in the groove disappears if it is too narrow.
- Adjacent widthwise grooves 4 are preferably disposed at intervals of 2 to 5 times the width of the widthwise grooves 4. The rigidity of the tread portion can be maintained while lowering the temperature of the tread portion.
- the pneumatic tire of the present invention is not limited to the above example, and changes can be appropriately made to the pneumatic tire of the present invention.
- the pneumatic tire of the present invention described above can have an internal structure that will be described below with reference to FIG.
- FIG. 6 is a diagram illustrating a half part of a tire width direction cross section of one embodiment of the pneumatic tire of the present invention.
- the illustrated pneumatic tire 1 is a heavy load for a construction vehicle, for example. Heavy duty tire.
- FIG. 6 is a cross-sectional view in the tire width direction showing a tire internal structure of a pneumatic tire according to an embodiment of the present invention, particularly a heavy duty tire such as a construction vehicle.
- the tire 100 has a rubber gauge (rubber thickness) of the tread portion 500 larger than that of a pneumatic tire mounted on a passenger car or the like.
- the tire internal structure described below is applicable to each tire having the tread pattern described with reference to FIGS.
- the tire 100 satisfies DC / OD ⁇ 0.015 when the tire outer diameter is OD and the rubber gauge of the tread portion 500 at the position of the tire equatorial plane CL is DC.
- the tire outer diameter OD (unit: mm) is a diameter of the tire 100 at a portion where the outer diameter of the tire 100 is maximum (generally, the tread portion 500 in the vicinity of the tire equatorial plane CL).
- the rubber gauge DC (unit: mm) is the rubber thickness of the tread portion 500 at the position of the tire equatorial plane CL.
- the rubber gauge DC does not include the thickness of the belt 300.
- channel is formed in the position containing tire equator surface CL, it is set as the rubber thickness of the tread part 500 in the position adjacent to the circumferential groove
- the tire 100 includes a pair of bead cores 110, a carcass 200, and a belt 300 including a plurality of belt layers. 6 shows only the half width of the tire 100, the half width of the tire 100 not shown has the same structure.
- the bead core 110 is provided in the bead unit 120.
- the bead core 110 is configured by a bead wire (not shown).
- the carcass 200 forms the skeleton of the tire 100.
- the position of the carcass 200 passes from the tread portion 500 through the buttress portion 900 and the sidewall portion 700 to the bead portion 120.
- the carcass 200 straddles between a pair of bead cores 110 and has a toroidal shape.
- the carcass 200 wraps the bead core 110 in this embodiment.
- the carcass 200 is in contact with the bead core 110. Both ends of the carcass 200 in the tire width direction twd are supported by a pair of bead portions 120.
- the carcass 200 has a carcass cord extending in a predetermined direction when viewed in plan from the tread tread surface 2 side.
- the carcass cord extends along the tire width direction twd.
- a steel wire is used as the carcass cord.
- the belt 300 is disposed on the tread portion 500.
- the belt 300 is located outside the carcass 200 in the tire radial direction trd.
- the belt 300 extends in the tire circumferential direction.
- the belt 300 has a belt cord that is inclined with respect to a predetermined direction that is a direction in which the carcass cord extends. For example, a steel cord is used as the belt cord.
- the belt 300 composed of a plurality of belt layers includes a first belt layer 301, a second belt layer 302, a third belt layer 303, a fourth belt layer 304, a fifth belt layer 305, and a sixth belt layer 306.
- the first belt layer 301 is located outside the carcass 200 in the tire radial direction trd.
- the first belt layer 301 is located on the innermost side in the belt 300 composed of a plurality of belt layers in the tire radial direction trd.
- the second belt layer 302 is located outside the first belt layer 301 in the tire radial direction trd.
- the third belt layer 303 is located outside the second belt layer 302 in the tire radial direction trd.
- the fourth belt layer 304 is located outside the third belt layer 303 in the tire radial direction trd.
- the fifth belt layer 305 is located outside the fourth belt layer 304 in the tire radial direction trd.
- the sixth belt layer 306 is located outside the fifth belt layer 305 in the tire radial direction trd.
- the sixth belt layer 306 is located on the outermost side in the belt 300 composed of a plurality of belt layers in the tire radial direction trd.
- the first belt layer 301, the second belt layer 302, the third belt layer 303, the fourth belt layer 304, the fifth belt layer 305, and the sixth belt layer 306 are arranged in this order. Be placed.
- the width of the first belt layer 301 and the second belt layer 302 (the width measured along the tire width direction twd. The same applies hereinafter) is 25% or more of the tread width TW. And it is 70% or less.
- the widths of the third belt layer 303 and the fourth belt layer 304 are 55% or more and 90% or less of the tread width TW.
- the widths of the fifth belt layer 305 and the sixth belt layer 306 are 60% or more and 110% or less of the tread width TW.
- the width of the fifth belt layer 305 is larger than the width of the third belt layer 303, and the width of the third belt layer 303 is equal to or larger than the width of the sixth belt layer 306.
- the width of the sixth belt layer 306 is larger than the width of the fourth belt layer 304, the width of the fourth belt layer 304 is larger than the width of the first belt layer 301, and the width of the first belt layer 301 is It is larger than the width of the second belt layer 302.
- the fifth belt layer 305 has the largest width and the second belt layer 302 has the smallest width.
- the belt 300 including a plurality of belt layers includes the shortest belt layer (that is, the second belt layer 302) having the shortest length in the tire width direction twd.
- the second belt layer 302 which is the shortest belt layer has a belt end 300e which is an edge in the tire width direction twd.
- the inclination angles of the belt cords of the first belt layer 301 and the second belt layer 302 with respect to the carcass cord are 70 ° or more and 85 ° or less.
- the inclination angle of the belt cords of the third belt layer 303 and the fourth belt layer 304 with respect to the carcass cord is not less than 50 ° and not more than 75 °.
- the inclination angle of the belt cords of the fifth belt layer 305 and the sixth belt layer 306 with respect to the carcass cord is not less than 50 ° and not more than 70 °.
- the belt 300 composed of a plurality of belt layers includes an inner cross belt group 300A, an intermediate cross belt group 300B, and an outer cross belt group 300C.
- the belt cords constituting the respective belt layers in the group are between belt layers adjacent to each other in the group (preferably, the tire equator) in a plan view from the tread tread surface 2 side.
- the inner cross belt group 300A is composed of a pair of belt layers and is located outside the carcass 200 in the tire radial direction trd.
- the inner cross belt group 300 ⁇ / b> A includes a first belt layer 301 and a second belt layer 302.
- the intermediate cross belt group 300B includes a pair of belt layers and is located outside the inner cross belt group 300A in the tire radial direction trd.
- the intermediate crossing belt group 300 ⁇ / b> B includes a third belt layer 303 and a fourth belt layer 304.
- the outer cross belt group 300C includes a pair of belt layers and is located outside the intermediate cross belt group 300B in the tire radial direction trd.
- the outer cross belt group 300 ⁇ / b> C includes a fifth belt layer 305 and a sixth belt layer 306.
- the inner cross belt group 300A has a width of 25% or more and 70% or less of the tread width TW.
- the width of the intermediate cross belt group 300B is 55% or more and 90% or less of the tread width TW.
- the width of the outer cross belt group 300C is 60% or more and 110% or less of the tread width TW.
- the inclination angle of the belt cord of the inner cross belt group 300A with respect to the carcass cord is 70 ° or more and 85 ° or less.
- the inclination angle of the belt cord of the intermediate cross belt group 300B with respect to the carcass cord is not less than 50 ° and not more than 75 °.
- the inclination angle of the belt cord of the outer cross belt group 300C with respect to the carcass cord is 50 ° or more and 70 ° or less.
- the inclination angle of the belt cord with respect to the carcass cord is the largest inclination angle of the inner cross belt group 300A.
- the inclination angle of the belt cord with respect to the carcass cord of the intermediate intersection belt group 300B is equal to or greater than the inclination angle of the belt cord with respect to the carcass cord of the outer intersection belt group 300C.
- the circumferential groove 3 is the innermost position in the tire width direction of the groove width center line WL passing through the center in the width direction of the circumferential groove 3 when viewed from the belt end 300e from the tread tread surface 2 side of the tire 100 (that is, The length DL along the tire width direction twd up to (the bent portion inward in the tire width direction) is 200 mm or less.
- the present invention is not limited to the following examples.
- the tire 1 of the example has a tire size of 59 / 80R63, and has a concave portion provided in the circumferential groove, and the width direction groove is inclined with respect to the tire width direction according to the numerical values in Table 1 and FIG. 2 is a tire having a tread pattern shown in FIG.
- the recess has a shape as shown in FIG. 2, and the width direction groove extends from the opening surface of the width direction groove toward the tire width direction from the recess gradually inclined wall surface W4 side to the recess steeply inclined wall surface W3 side.
- the extended surface W5 of the groove wall surface on the concave steeply inclined wall surface W3 side of the pair of groove wall surfaces of the width direction groove coincides with the concavely steeply inclined wall surface W3.
- the tire 1 of the comparative example is the same tire as the tire of the example 1 except that no recess is provided and the width direction groove is extended in a direction parallel to the tire width direction.
- the tire of Comparative Example 2 is a tire having the tread pattern shown in FIG. 4A similar to the tire of Example 1 except that the widthwise grooves extend in a direction parallel to the tire width direction.
- Each test tire was assembled to a rim (rim width: 36 inches) and an internal pressure (600 kPa) was applied, and then an indoor drum test (load: 82.5 tons, drum diameter: 5 m, drum surface speed: 8 km / h) Then, the tire was rolled in the inclination direction of the width direction groove or in the direction opposite to the inclination direction, and the temperature of the rib-shaped central land portion adjacent to the circumferential groove after running for 24 hours was measured. And the temperature difference before and behind driving
- a larger index means that heat is radiated from the tread portion.
- the temperature measurement point is a width passing through a virtual straight line in the tire circumferential direction 50 mm away from the circumferential groove wall surface inward in the tire width direction and a position in the circumferential middle of the widthwise groove adjacent to the tire circumferential direction. This is a point where a virtual straight line extending in parallel with the direction groove intersects.
- the temperature of the tread portion is lower than that of the tire of Comparative Example 1 that is not provided with the recesses.
- the temperature of the land portion is higher than that of the tire of Comparative Example 2 in which the widthwise grooves are not inclined. It turns out that falls.
- a pneumatic tire capable of minimizing an increase in the area of the groove, promoting heat dissipation of the tread portion, and reducing the temperature of the tread portion.
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Abstract
Description
従来、トレッド部の温度を低下させるには、トレッド部に溝を形成することで、発熱源となるトレッドゴムを除去するとともに、トレッド部の表面積を増加して放熱を高めるという方法が採用されてきた(例えば、特許文献1)。
前記幅方向溝が上記のようにタイヤ幅方向に対して傾斜している場合には、前記幅方向溝の一対の溝壁面のうち、前記凹部急傾斜壁面側の該溝壁面の延長面が、前記凹部急傾斜壁面と一致することが好ましい。これによれば、トレッド部の温度をさらに十分に低下させることができる。
なお、図示するトレッドパターンは一例であり、本発明は、リブ基調パターンおよびブロック基調パターンのいずれにも適用可能である。また、幅方向溝4は、一定ではなく変化する溝幅とすること、ジグザグ状、波状等の任意の延在形態にすること、または例えばトレッド端TEに開口させずに他の溝に連通させるなどの任意の形態とすることができる。
そして、幅狭の周方向溝13と、タイヤ幅方向に平行な方向に延在し、周方向溝13に開口する幅広の幅方向溝14とが形成されたタイヤ11では、図4(b)に示すように、タイヤ11転動によって幅方向溝14内から周方向溝13内への空気流が生じるが、図示のように幅方向溝14がタイヤ幅方向に平行な方向に延在するので、幅方向溝14内の空気流が、幅方向溝14に対向する周方向溝13の周方向溝壁面に衝突し、その空気流がタイヤ回転方向に対して順方向FD(図4では下向き)および逆方向OD(図4では上向き)に略等しい量に分散する。そして、タイヤ周方向に隣り合う幅方向溝14のそれぞれからの空気流が、中間地点Mにおいて衝突することとなる。したがって中間地点Mでは空気の流れが停滞するので、中間地点M付近を十分に放熱させることができず、その結果としてトレッド部の温度を十分に低下させることができなかった。
この構成によれば、図2(b)に示すように、凹部5によって、幅方向溝4内から周方向溝3内に流れ込む空気流を、周方向溝3内において不均等に分散させることができる。それゆえに、周方向溝3内の順方向FDおよび逆方向ODの空気流のそれぞれが衝突する地点M’が、凹部5を設けない場合に比して幅方向溝4側に移動し、中間地点Mに空気流が行きわたるので、地点M付近がより放熱し、その結果としてトレッド部の温度をより十分に低下させることができる。なお移動した地点M’は、空気流により放熱されにくくなるが、幅方向溝付近に位置するので、地点M’が中間地点Mに位置する場合よりも、トレッド部の温度を低下させることができる。
または、凹部5は、タイヤ周方向の長さLが、周方向溝3に開口する凹部開口面51側から奥に、図示では頂点Tに向かって減少することが好ましい。具体的には、長さLは、凹部開口面51で最大であり、頂点Tに向かうにつれて減少する。
上記の構成とすることで、幅方向溝4内から周方向溝3内への空気流が、図示のように、凹部5の角部A3側から流入して角部A4側から周方向溝3へ流出することで、空気が逆方向ODへ流れやすくなる。それゆえに幅方向溝4内から周方向溝3内への空気流が、より効果的に不均等に分散され、中間地点M付近をより放熱させることができる。
なお、幅方向溝4内から周方向溝3内への空気流を、効果的に不均等に分散させる観点からは、凹部5の頂点Tは、特に凹部5がθ3=θ4の二等辺三角形状のときは、幅方向溝4の中心軸線(例えば図2(a)の一点鎖線で示す)の上とは異なる位置に存在するように、凹部5を形成することが好ましい。
また、凹部5は、タイヤ周方向で、角部A3およびA4に挟まれる範囲内に配設されることが好ましい。凹部5内を通過する空気流が滑らかになるためである。
幅方向溝4が傾斜するとともに、幅方向溝4の開口面4aからタイヤ幅方向外側へ見て幅方向溝4が傾斜するタイヤ周方向(以下、「幅方向溝4の傾斜方向」ともいう。)にタイヤ1が転動する場合、図2(b)に示すように、幅方向溝4内から周方向溝3内に空気が流れ込むこととなるところ、空気流が、幅方向溝14が傾斜していないタイヤ(図4(a))に比して、より順方向FDおよび逆方向ODに不均等に分散され、空気流のそれぞれが衝突する地点M’がさらに幅方向溝4側に移動する。そして、幅方向溝4の角度θ5を30°以上にすると、幅方向溝4の傾斜方向にタイヤ1が転動する場合には、地点M’がさらに幅方向溝4側に移動するので、より効果的にトレッド部の温度を低下させることができる。
一方、幅方向溝4が傾斜するとともに、幅方向溝4の傾斜方向とは反対の方向にタイヤ1が転動する場合、図3に示すように、周方向溝3内から幅方向溝4内へ空気が流れ込むこととなるが、その際、図3に示すように、周方向溝3のトレッド踏面2への開口側から溝底側への下降気流が、周方向溝3の周辺の地点Pで発生するので、地点Pを効果的に放熱させることができる。そして、幅方向溝4の角度θ5を30°以上にすると、図示のように、周方向溝3内に小さい空気の渦が発生して、下降気流がその渦を乗り越えて流れるので、角度θ5を30°未満した場合と比してその下降気流をより強くすることができる。それゆえに、地点Pを効果的に冷却しつつ、空気が幅方向溝4へと流れることとなり、幅方向溝4の傾斜方向とは反対の方向にタイヤ1が転動してもトレッド部の温度を低下させることができる。
幅方向溝4の溝幅は、狭すぎると溝内の空気流れがなくなる為、5~120mmであることが好ましい。隣り合う幅方向溝4は、幅方向溝4の溝幅の2~5倍の間隔で配設されることが好ましい。トレッド部の温度を低下させつつ、トレッド部の剛性を維持することができる。
比較例のタイヤ1は、凹部を設けず、幅方向溝をタイヤ幅方向に平行な方向に延在させた以外、実施例1のタイヤと同様のタイヤである。比較例2のタイヤは、幅方向溝をタイヤ幅方向に平行な方向に延在させた以外、実施例1のタイヤと同様の図4(a)に示すトレッドパターンを有するタイヤである。
なお、タイヤを幅方向溝の傾斜方向に転動させると、主に幅方向溝内から周方向溝内への空気流が生じ、またタイヤを傾斜方向とは逆方向に転動させると、主に周方向溝内から幅方向溝内への空気流が生じる。
Claims (6)
- トレッド踏面に、タイヤ周方向に沿って延びる少なくとも1本の周方向溝と、該周方向溝に開口し、前記周方向溝よりも広い溝幅の複数の幅方向溝とが形成された空気入りタイヤであって、
前記周方向溝の周方向溝壁面に、該周方向溝に向かって凹状の凹部が形成され、
前記幅方向溝が前記周方向溝へ開口する開口面は、前記凹部が前記周方向溝へ開口する凹部開口面の少なくとも一部に対向し、
前記幅方向溝は、タイヤ幅方向に対して30°以上の角度をなして延びることを特徴とする空気入りタイヤ。 - 前記凹部は、タイヤ幅方向の長さが、タイヤ周方向に沿って変化することを特徴とする請求項1に記載の空気入りタイヤ。
- 前記凹部は、タイヤ周方向の長さが、該凹部の前記凹部開口面側から奥に向かって減少することを特徴とする請求項1または2に記載の空気入りタイヤ。
- 前記凹部は、トレッド踏面から見た場合、タイヤ幅方向に平行な仮想線に対して非対称の平面形状を有することを特徴とする請求項1~3のいずれかに記載の空気入りタイヤ。
- 前記凹部は、凹部緩傾斜壁面と、該凹部緩傾斜壁面よりも前記凹部開口面に対する傾斜角度の大きな凹部急傾斜壁面とを備え、
前記幅方向溝は、前記凹部緩傾斜壁面側から前記凹部急傾斜壁面側に向かって、前記幅方向溝の前記開口面からタイヤ幅方向外側へ延びることを特徴とする請求項1~4のいずれかに記載の空気入りタイヤ。 - 前記幅方向溝の一対の溝壁面のうち、前記凹部急傾斜壁面側の該溝壁面の延長面が、前記凹部急傾斜壁面と一致することを特徴とする請求項5に記載の空気入りタイヤ。
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CN201480020087.7A CN105102244B (zh) | 2013-04-09 | 2014-04-09 | 充气轮胎 |
BR112015025759A BR112015025759A2 (pt) | 2013-04-09 | 2014-04-09 | pneu pneumático |
EP14782769.5A EP2985156B1 (en) | 2013-04-09 | 2014-04-09 | Pneumatic tire |
ES14782769.5T ES2638199T3 (es) | 2013-04-09 | 2014-04-09 | Neumático |
US14/772,817 US20160009144A1 (en) | 2013-04-09 | 2014-04-09 | Pneumatic tire |
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JP2013-081152 | 2013-04-09 | ||
JP2013081152A JP5557943B1 (ja) | 2013-04-09 | 2013-04-09 | 空気入りタイヤ |
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US (1) | US20160009144A1 (ja) |
EP (1) | EP2985156B1 (ja) |
JP (1) | JP5557943B1 (ja) |
CN (1) | CN105102244B (ja) |
BR (1) | BR112015025759A2 (ja) |
CL (1) | CL2015002994A1 (ja) |
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JP2003205706A (ja) | 2002-01-15 | 2003-07-22 | Bridgestone Corp | 空気入りタイヤ |
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AT403455B (de) * | 1994-12-21 | 1998-02-25 | Semperit Ag | Fahrzeugreifen mit einem drehrichtungsgebunden ausgebildeten laufstreifenprofil |
JP3335118B2 (ja) * | 1998-01-19 | 2002-10-15 | 住友ゴム工業株式会社 | 重荷重用タイヤ |
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JP2005186703A (ja) * | 2003-12-24 | 2005-07-14 | Bridgestone Corp | 空気入りタイヤ |
JP2006151083A (ja) * | 2004-11-26 | 2006-06-15 | Bridgestone Corp | 重荷重車両用タイヤ |
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JP5580369B2 (ja) * | 2012-07-04 | 2014-08-27 | 株式会社ブリヂストン | タイヤ |
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2013
- 2013-04-09 JP JP2013081152A patent/JP5557943B1/ja not_active Expired - Fee Related
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2014
- 2014-04-09 BR BR112015025759A patent/BR112015025759A2/pt not_active Application Discontinuation
- 2014-04-09 ES ES14782769.5T patent/ES2638199T3/es active Active
- 2014-04-09 WO PCT/JP2014/002056 patent/WO2014167859A1/ja active Application Filing
- 2014-04-09 CN CN201480020087.7A patent/CN105102244B/zh not_active Expired - Fee Related
- 2014-04-09 US US14/772,817 patent/US20160009144A1/en not_active Abandoned
- 2014-04-09 EP EP14782769.5A patent/EP2985156B1/en not_active Not-in-force
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2015
- 2015-10-08 CL CL2015002994A patent/CL2015002994A1/es unknown
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JP2003205706A (ja) | 2002-01-15 | 2003-07-22 | Bridgestone Corp | 空気入りタイヤ |
JP2008500923A (ja) * | 2004-05-28 | 2008-01-17 | シュタインケ、リチャード・エイ | アーチ状をなすショルダを有するエラストマタイヤ |
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See also references of EP2985156A4 |
Also Published As
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EP2985156A1 (en) | 2016-02-17 |
CL2015002994A1 (es) | 2016-07-01 |
JP2014201273A (ja) | 2014-10-27 |
CN105102244B (zh) | 2017-12-12 |
CN105102244A (zh) | 2015-11-25 |
EP2985156B1 (en) | 2017-06-07 |
ES2638199T3 (es) | 2017-10-19 |
EP2985156A4 (en) | 2016-03-09 |
BR112015025759A2 (pt) | 2020-05-12 |
US20160009144A1 (en) | 2016-01-14 |
JP5557943B1 (ja) | 2014-07-23 |
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