WO2017014095A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2017014095A1 WO2017014095A1 PCT/JP2016/070470 JP2016070470W WO2017014095A1 WO 2017014095 A1 WO2017014095 A1 WO 2017014095A1 JP 2016070470 W JP2016070470 W JP 2016070470W WO 2017014095 A1 WO2017014095 A1 WO 2017014095A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tire
- carcass
- distance
- convex
- rotation axis
- 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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/02—Arrangement of grooves or ribs
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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
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
- B60C2013/007—Thickness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to a pneumatic tire.
- Patent Document 1 discloses a technique for extending a carcass folding portion between a belt and a carcass main body portion and reducing a rubber gauge at a side portion to reduce the weight of a pneumatic tire and reduce rolling resistance.
- An object of the present invention is to provide a pneumatic tire that can be reduced in weight while suppressing a decrease in rigidity and cut resistance.
- the present invention is a pneumatic tire that is rotatable about a rotating shaft and has side portions disposed on both sides of the tread portion and the tire width direction with respect to the tire width direction, and is folded back by a carcass main body portion and a bead core.
- Each of the convex portions has a first end portion and a second end portion disposed outside the first end portion with respect to the tire radial direction, and the rotation shaft and Within the intersecting plane, the distance between the first end portion and the second end portion is larger than the width of the convex portion in the short direction, and the center of the tire in the tire width direction is CL, and the maximum tire width position P1 is an intersection of the parallel line LP parallel to the rotation axis and the outer surface of the carcass, P2 is an intersection of the parallel line LP and the side surface, and is arranged on the outermost side in the tire width direction.
- W1 is a distance between the tire center CL and the intersection P1 in a direction parallel to the rotation axis
- the tire center CL is in the direction parallel to the rotation axis.
- the distance from the intersection point P2 is W2
- the distance between the tire center CL and the intersection point P3 is W3 in the direction parallel to the rotation axis
- the distance between the intersection point P1 and the intersection point P2 is G1
- the convex portions are provided on the side surface of the side rubber, even if the distance G1 indicating the thickness of the side rubber is reduced to reduce the weight, the reduction in rigidity and cut resistance is suppressed.
- the plurality of longitudinal convex portions are connected to the side surface so as to include the tire maximum width position and are arranged in the tire circumferential direction, bending of the side portions is suppressed, and the side rubber is protected by the convex portions. Thereby, the fall of the rigidity of a pneumatic tire and cut resistance is suppressed. Further, the bending of the side portion is suppressed and the side rubber is protected, so that the carcass is sufficiently protected and the deterioration of the carcass is suppressed.
- the carcass turn-up portion does not extend to the tire maximum width position. Even if the carcass folded-back portion does not extend to the tire maximum width position, the convex portion suppresses a decrease in rigidity and cut resistance of the pneumatic tire. Moreover, the increase in the weight of the pneumatic tire due to the carcass is suppressed by preventing the carcass folded portion from extending to the tire maximum width position.
- the air resistance at the tire maximum width position tends to increase.
- the longitudinal convex portion so as to include the tire maximum width position, an air circulation promoting effect and a rectifying effect are obtained. Thereby, air resistance is reduced and the fuel consumption of the vehicle can be reduced.
- the distance W1 defines the carcass section width S1
- the distance W2 defines the tire section width S2
- the distance W3 defines the tire total width S3.
- the carcass cross-sectional width S1 corresponds to twice the distance W1
- the tire cross-sectional width S2 corresponds to twice the distance W2
- the total tire width S3 corresponds to twice the distance W3.
- the distance G1 is a difference between the distance W2 and the distance W1
- the distance G2 is a difference between the distance W3 and the distance W2.
- a pneumatic tire having a total tire width suitable for the vehicle to be mounted is manufactured.
- the distance W1 is uniquely determined from the equation (1). If W1 / W3 is greater than 0.95, the distance between the carcass outer surface and the convex outer surface will be too short, and the carcass will not be sufficiently protected. When W1 / W3 is smaller than 0.80, the distance between the carcass outer surface and the convex outer surface is too long, and it is difficult to reduce the weight of the pneumatic tire. By satisfying the condition of the formula (1), it is possible to reduce the weight while sufficiently protecting the carcass.
- the distance W2 is uniquely determined from the equation (2).
- the distance G1 indicates the thickness of the side rubber
- the distance G2 indicates the height of the convex portion.
- G1 / G2 is smaller than 0.1, the thickness of the side rubber is too thin, and the carcass is not sufficiently protected.
- G1 / G2 is larger than 1, the thickness of the side rubber becomes larger than the height of the convex portion, and it becomes difficult to reduce the weight of the pneumatic tire.
- the present invention is a pneumatic tire that is rotatable about a rotating shaft and has side portions disposed on both sides of the tread portion and the tire width direction with respect to the tire width direction, and is folded back by a carcass main body portion and a bead core.
- Each of the convex portions has a first end portion and a second end portion disposed outside the first end portion with respect to the tire radial direction, and the rotation shaft and Within the intersecting plane, the distance between the first end portion and the second end portion is larger than the width of the convex portion in the short direction, and the center of the tire in the tire width direction is CL, and the maximum tire width position P1 is an intersection of the parallel line LP parallel to the rotation axis and the outer surface of the carcass, P2 is an intersection of the parallel line LP and the side surface, and is arranged on the outermost side in the tire width direction.
- W1 is a distance between the tire center CL and the intersection P1 in a direction parallel to the rotation axis
- the tire center CL is in the direction parallel to the rotation axis.
- the distance from the intersection point P2 is W2
- the distance between the tire center CL and the intersection point P3 is W3 in the direction parallel to the rotation axis
- the distance between the intersection point P1 and the intersection point P2 is G1
- the distance W1 is uniquely determined from the equation (3).
- the distance G1 indicates the thickness of the side rubber.
- the side rubber cage of the conventional pneumatic tire is thicker than 2.5 [mm].
- the weight of the pneumatic tire can be reduced. If the distance G1 is smaller than 1.0 [mm], the thickness of the side rubber is too thin, and the carcass is not sufficiently protected.
- satisfying the condition of the expression (4) in addition to the condition of the expression (3) it is possible to reduce the weight while sufficiently protecting the carcass.
- all of the plurality of convex portions are connected to the side surface so as to include the tire maximum width position.
- the bending of the side portion at the tire maximum width position is sufficiently suppressed, and the side rubber and the carcass are sufficiently protected. Further, the air resistance is reduced, and the fuel efficiency of the vehicle can be reduced.
- the convex portion is 0.1 in the tire radial direction. It is preferable to be provided in a range of from x SH to 0.4 x SH.
- the convex portion In a range larger than 0.4 ⁇ SH, the convex portion reaches the region outside the side portion of the tire, and only the weight of the pneumatic tire increases, and the rigidity reduction suppressing function, A significant improvement in the cutability reduction suppressing function and the carcass protection function cannot be expected. In addition, the carcass protection function cannot be exhibited in a range smaller than 0.1 ⁇ SH.
- the convex portion By providing the convex portion in the range of 0.1 ⁇ SH to 0.4 ⁇ SH, the function of the convex portion is sufficiently exhibited while the weight of the pneumatic tire is reduced.
- the number of the convex portions arranged in the tire circumferential direction on the side surface is preferably 10 or more and 50 or less.
- the number of convex portions When the number of convex portions is less than 10, the air flow promoting effect and the rectifying effect are not sufficiently obtained. When the number of protrusions exceeds 50, the protrusions have air resistance, and even in this case, the air circulation promoting effect and the rectifying effect cannot be sufficiently obtained. Moreover, when there are too many convex parts, the weight of a pneumatic tire will increase. By setting the number of convex portions to 10 or more and 50 or less, it is possible to improve air resistance and reduce fuel consumption of the vehicle while suppressing an increase in weight.
- the width of the convex portion in the short direction is 0.5 [mm] or more and 5.0 [mm] or less.
- the width of the convex portion in the short direction is less than 0.5 [mm]
- the convex portion is easily deformed, and it becomes difficult to obtain an air flow promoting effect and a rectifying effect.
- the width of the convex portion in the short direction exceeds 5.0 [mm]
- the convex portion becomes air resistance, and the air circulation promoting effect and the rectifying effect are not sufficiently obtained.
- the weight of the pneumatic tire is increased.
- the air resistance of the vehicle is further suppressed, and fuel consumption can be reduced.
- the concave portion in addition to the convex portion, the air flowing from the front side to the rear side of the vehicle becomes turbulent.
- a turbulent boundary layer is generated around the pneumatic tire, and the spread of air is suppressed.
- a pneumatic tire that can be reduced in weight while suppressing a decrease in rigidity and cut resistance.
- FIG. 1 is a side view showing an example of a vehicle according to the first embodiment.
- FIG. 2 is a view of the vehicle according to the first embodiment viewed from the rear.
- FIG. 3 is a cross-sectional view illustrating an example of a pneumatic tire according to the first embodiment.
- FIG. 4 is a meridional sectional view showing a part of the pneumatic tire according to the first embodiment.
- FIG. 5 is a view showing a part of the pneumatic tire according to the first embodiment.
- FIG. 6 is a diagram illustrating an example of a side portion of the pneumatic tire according to the first embodiment.
- FIG. 7 is a diagram illustrating an example of a side portion of the pneumatic tire according to the first embodiment.
- FIG. 1 is a side view showing an example of a vehicle according to the first embodiment.
- FIG. 2 is a view of the vehicle according to the first embodiment viewed from the rear.
- FIG. 3 is a cross-sectional view illustrating an example of a pneumatic tire according
- FIG. 8 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 9 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 10 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 11 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 12 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 13 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 14 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 15 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 16 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 17 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 18 is a diagram illustrating an example of a side portion of the pneumatic tire according to the second embodiment.
- FIG. 19 is a diagram illustrating an example of a side portion of the pneumatic tire according to the third embodiment.
- FIG. 20 is a diagram illustrating an example of a side portion of the pneumatic tire according to the fourth embodiment.
- FIG. 21 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 21 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 22 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 23 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 24 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 25 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 26 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 27 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 28 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 29 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 30 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 31 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 32 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 33 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 34 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 35 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 36 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 37 is a chart showing the results of the tire evaluation test according to the present invention.
- FIG. 1 is a side view showing an example of a vehicle 500 according to the present embodiment.
- FIG. 2 is a view of the vehicle 500 according to the present embodiment as viewed from the rear.
- Tire 1 is mounted on vehicle 500.
- the tire 1 is a pneumatic tire.
- the tire 1 attached to the vehicle 500 rotates about the rotation axis AX and travels on the road surface RS.
- the tire circumferential direction is a rotation direction around the rotation axis AX of the tire 1.
- the tire radial direction is a radial direction with respect to the rotation axis AX of the tire 1.
- the tire width direction is a direction parallel to the rotation axis AX of the tire 1.
- the vehicle 500 includes a traveling device 501 including a tire 1, a vehicle body 502 supported by the traveling device 501, and an engine 503 for driving the traveling device 501.
- the traveling device 501 includes a wheel 504 that supports the tire 1, an axle 505 that supports the wheel 504, a steering device 506 that changes the traveling direction of the traveling device 501, and a brake device that decelerates or stops the traveling device 501. 507.
- the vehicle body 502 has a driver's cab in which the driver is boarded.
- An accelerator pedal for adjusting the output of the engine 503, a brake pedal for operating the brake device 507, and a steering wheel for operating the steering device 506 are disposed in the cab.
- a driver operates an accelerator pedal, a brake pedal, and a steering wheel.
- the vehicle 500 travels by the operation of the driver.
- Vehicle 500 is a four-wheel vehicle.
- the traveling device 501 includes a left front wheel and a left rear wheel provided on the left side of the vehicle body 502, and a right front wheel and a right rear wheel provided on the right side of the vehicle body 502.
- the tire 1 includes a left tire 1L mounted on the left side of the vehicle body 502 and a right tire 1R mounted on the right side of the vehicle body 502.
- the tire 1 includes a tread portion 10 that contacts the road surface RS, and side portions 7 that are disposed on both sides of the tread portion 10 in the tire width direction.
- the rotation direction of the tire 1 around the rotation axis AX is specified. That is, when the vehicle 500 moves forward, the tire 1 is mounted on the vehicle 500 so as to rotate in a specified rotation direction around the rotation axis AX.
- the left tire 1L is mounted on the left side of the vehicle 500 and rotates in the rotation direction designated when the vehicle 500 moves forward.
- the right tire 1 ⁇ / b> R is mounted on the right side of the vehicle 500 and rotates in the rotation direction designated when the vehicle 500 moves forward.
- a mark 600 indicating the rotation direction of the tire 1 or the mounting position of the tire 1 with respect to the vehicle 500 is provided on the side portion 7 of the tire 1.
- the mark 600 may be an arrow indicating the rotation direction or may be a character such as “OUTSIDE”. Based on the mark 600, the tire 1 is mounted on the vehicle 500 so as to rotate in the rotation direction designated around the rotation axis AX when the vehicle 500 moves forward.
- FIG. 3 is a cross-sectional view illustrating an example of the tire 1 according to the present embodiment.
- FIG. 4 is a cross-sectional view showing a part of the tire 1 according to this embodiment.
- the tire 1 is a pneumatic tire.
- the tire 1 can rotate around the rotation axis AX.
- 3 and 4 show a meridional section passing through the rotation axis AX of the tire 1.
- the rotation axis AX of the tire 1 is orthogonal to the tire equatorial plane CL.
- the rotation direction of the tire 1 around the rotation axis AX is appropriately referred to as a tire circumferential direction
- the radial direction with respect to the rotation axis AX is appropriately referred to as a tire radial direction
- a direction parallel to the rotation axis AX is appropriately referred to as the tire width direction.
- the tire equatorial plane CL is appropriately referred to as a tire center CL.
- the tire center CL indicates the center of the tire 1 in the tire width direction.
- the outer side in the tire width direction refers to a direction away from the tire center CL in the tire width direction.
- the inner side in the tire width direction refers to a direction approaching the tire center CL in the tire width direction.
- the outer side in the tire radial direction refers to a direction away from the rotation axis AX with respect to the tire radial direction.
- the inner side in the tire radial direction refers to a direction approaching the rotation axis AX with respect to the tire radial direction.
- the tire 1 includes a carcass 2, a belt layer 3, a belt cover 4, a bead part 5, a tread part 10, a side part 7 including a sidewall part 9, and a convex part 100 provided on the side part 7. It has.
- the tread portion 10 includes a tread rubber 6.
- the side part 7 includes a side rubber 8.
- the convex portion 100 is made of rubber, for example.
- the tire outer diameter OD indicating the outer diameter of the tire 1 is a diameter of the tire 1 when the tire 1 is assembled on a regular rim, filled with a regular internal pressure, and no load is applied to the tire 1.
- the tire rim diameter RD indicating the rim diameter of the tire 1 refers to a rim diameter of a wheel suitable for the tire 1.
- the tire rim diameter RD is equal to the tire inner diameter.
- the tire cross-sectional height SH indicating the cross-sectional height of the tire 1 is a tire diameter when the tire 1 is assembled on a regular rim, filled with a regular internal pressure, and no load is applied to the tire 1. It refers to the distance between the inner end of the innermost tire 1 and the outer end of the outermost tire 1 with respect to the direction.
- the tread contact width TW1 indicating the contact width of the tread portion 10 is a state in which the tire 1 is assembled on a regular rim, filled with a regular internal pressure, placed vertically on a plane, and a normal load is applied.
- the contact end T of the tread portion 10 means that the tire 1 is assembled on a regular rim, filled with a regular internal pressure, placed vertically on a plane, and the tread portion 10 is in a loaded state with a regular load applied.
- the tread development width TW2 indicating the development width of the tread portion 10 is the tire 1 in a no-load state in which the tire 1 is assembled on a regular rim, filled with a regular internal pressure, and no load is applied to the tire 1.
- the linear distance of both ends in the development view of the tread portion 10 is said.
- the carcass cross-sectional width S1 indicating the cross-sectional width of the carcass 2 is related to the tire width direction when the tire 1 is assembled on a normal rim, filled with a normal internal pressure, and no load is applied to the tire 1. This is the maximum dimension of the carcass 2. That is, the carcass cross-sectional width S1 is the carcass maximum width position E indicating the outermost part of the carcass 2 disposed on one side of the tire center CL in the tire width direction, and the outermost side of the carcass 2 disposed on the other side. This is the distance from the carcass maximum width position E indicating the part.
- the tire cross-sectional width S2 indicating the cross-sectional width of the tire 1 is that the tire 1 is assembled on a regular rim, filled with a regular internal pressure, and the side portion 7 is in an unloaded state where no load is applied to the tire 1.
- the maximum dimension of the tire 1 in the tire width direction excluding structures protruding from the surface.
- the convex part 100 exists as a structure protruding from the surface of the side part 7.
- the tire cross-sectional width S2 is the tire maximum width position H indicating the outermost portion of the side portion 7 arranged on one side of the tire center CL in the tire width direction when the convex portion 100 is removed, and the tire cross-sectional width S2 is arranged on the other side. The distance with the tire maximum width position H which shows the outermost part of the made side part 7 is said.
- a rim protect bar that protects the rim may be provided on the tire 1.
- the rim protect bar is provided in the tire circumferential direction and protrudes outward in the tire width direction.
- the rim protect bar includes the outermost portion in the tire width direction.
- the tire cross-sectional width S2 is a dimension excluding the rim protect bar.
- the tire total width S3 indicating the total width of the tire 1 is related to the tire width direction when the tire 1 is assembled on a regular rim, filled with a regular internal pressure, and no load is applied to the tire 1. This is the maximum dimension of the tire 1. That is, the tire total width S3 is the outermost part of the structure constituting the tire 1 arranged on one side of the tire center CL in the tire width direction and the structure constituting the tire 1 arranged on the other side. The distance to the outermost part of In this embodiment, the convex part 100 which protrudes from the surface of the side part 7 is provided.
- the total tire width S3 is the maximum convex portion width position F indicating the outermost portion of the convex portion 100 arranged on one side of the tire center CL in the tire width direction, and the maximum of the convex portion 100 arranged on the other side. This is the distance from the convex maximum width position F indicating the outer part.
- the “regular rim” is a rim that is defined for each tire 1 in the standard system including the standard on which the tire 1 is based.
- the standard rim is used for JATMA, “Design Rim” is used for TRA, and ETRTO is used. If present, it is “Measuring Rim”. However, when the tire 1 is a tire mounted on a new vehicle, a genuine wheel on which the tire 1 is assembled is used.
- Regular internal pressure is the air pressure determined for each tire 1 in the standard system including the standard on which the tire 1 is based.
- the maximum air pressure is JATMA and the table “TIRE LOAD LIMITS AT VARIOUS” is TRA.
- the tire 1 is a tire mounted on a new vehicle, the air pressure displayed on the vehicle is used.
- Regular load is a load determined by each tire 1 in the standard system including the standard on which the tire 1 is based.
- the maximum load capacity is set for JATMA, and the table “TIRE LOAD LIMITS AT” is set for TRA.
- the maximum value described in VARIOUS COLD INFRATION PRESURES is "LOAD CAPACITY" for ETRTO.
- the load is equivalent to 88% of the load.
- the wheel load is obtained by dividing the longitudinal axle weight described in the vehicle verification of the vehicle by the number of tires.
- the carcass 2 is a strength member that forms the skeleton of the tire 1.
- the carcass 2 includes a carcass cord and functions as a pressure vessel when the tire 1 is filled with air.
- the carcass 2 includes an organic fiber carcass cord and rubber covering the carcass cord.
- the carcass 2 may include a polyester carcass cord, a nylon carcass cord, an aramid carcass cord, or a rayon carcass cord.
- the bead portion 5 is a strength member that supports the carcass 2.
- the bead portions 5 are disposed on both sides of the carcass 2 in the tire width direction, and support both end portions of the carcass 2.
- the carcass 2 is folded back at the bead core 51 of the bead portion 5.
- the bead portion 5 fixes the tire 1 to the rim.
- the bead portion 5 includes a bead core 51 and a bead filler 52.
- the carcass 2 has a carcass main body 21 and a carcass folded portion 22 formed by being folded by a bead core 51.
- the carcass folding portion 22 is a portion disposed on the outer side in the tire width direction than the carcass main body portion 21 when the carcass 2 is folded by the bead core 51.
- the bead core 51 is a member in which a bead wire is wound in a ring shape.
- the bead wire is a steel wire.
- the bead filler 52 is a rubber material that is disposed in a space between the carcass main body portion 21 and the carcass folding portion 22 formed by folding the carcass 2 with the bead core 51.
- the belt layer 3 is a strength member that maintains the shape of the tire 1.
- the belt layer 3 includes a belt cord and is disposed between the carcass 2 and the tread rubber 6.
- the belt layer 3 includes a belt cord made of metal fibers and rubber covering the belt cord.
- the belt layer 3 may include an organic fiber belt cord.
- the belt layer 3 includes a first belt ply 31 and a second belt ply 32. The first belt ply 31 and the second belt ply 32 are laminated so that the belt cord of the first belt ply 31 and the belt cord of the second belt ply 32 intersect each other.
- the belt cover 4 is a strength member that protects and reinforces the belt layer 3.
- the belt cover 4 includes a cover cord and is disposed outside the belt layer 3 with respect to the rotation axis AX of the tire 1.
- the belt cover 4 includes a metal fiber cover cord and rubber covering the cover cord.
- the belt cover 4 may include an organic fiber cover cord.
- the tread rubber 6 protects the carcass 2.
- the tread portion 10 includes a tread rubber 6 provided with a plurality of grooves 15.
- the tread portion 10 includes a land portion 12 disposed between the grooves 15, and the land portion 12 has a ground contact surface (tread surface) 11 that comes into contact with the road surface.
- the groove 15 includes a plurality of main grooves arranged in the tire circumferential direction and lug grooves at least partially arranged in the tire width direction.
- the tread portion 10 includes a center portion 13 including the tire center CL and shoulder portions 14 provided on both sides of the center portion 13 in the tire width direction.
- the main groove is provided in each of the center portion 13 and the shoulder portion 14. Lug grooves are also provided in each of the center portion 13 and the shoulder portion 14.
- the side rubber 8 protects the carcass 2.
- the side portion 7 includes a side rubber 8 and is disposed on both sides of the tread portion 10 in the tire width direction.
- the sidewall portion 9 includes a portion of the side portion 7 that swells most outward in the tire width direction.
- the surface of the side portion 7 is disposed outside the ground contact end T of the tread portion 10 with respect to the tire center CL.
- the surface of the side portion 7 includes a side surface 8S that is the surface of the side rubber 8.
- the side surface 8S is a surface of the side portion 7 between the ground contact end T of the tread portion 10 and the rim check line R.
- the ground contact end T includes a boundary between the shoulder portion 14 of the tread portion 10 and the side portion 7.
- the rim check line R is a line for confirming whether or not the rim assembly of the tire 1 is normally performed.
- the rim check line R is shown as an annular convex line that continues in the tire circumferential direction along the rim flange on the surface of the bead portion 5 outside the rim flange in the tire radial direction.
- the convex portion 100 is connected to the side surface 8S and protrudes outward in the tire width direction from the side surface 8S.
- the convex portion 100 has a convex outer surface 100S that faces the outer side in the tire width direction.
- a plurality of convex portions 100 are provided on the side surface 8.
- FIG. 5 is an enlarged view of a part of FIG.
- the carcass main body 21 has a carcass outer surface 21 ⁇ / b> S that faces the outer side in the tire width direction.
- the side rubber 8 is connected to the carcass outer surface 21S of the carcass main body 21.
- the convex part 100 is connected to the convex outer surface 8S of the side rubber 8.
- the carcass maximum width position E is positioned on the carcass outer surface 21S of the carcass main body 21.
- the tire maximum width position H is positioned on the side surface 8S of the side rubber 8.
- the convex portion maximum width position F is positioned on the convex portion outer surface 100 ⁇ / b> S of the convex portion 100.
- a plurality of convex portions 100 are arranged in the tire circumferential direction on the side surface 8 between the ground contact end T and the rim check line R.
- the convex portion 100 is connected to the side surface 8S so as to include the tire maximum width position H.
- the convex part 100 is a longitudinal shape which has the 1st end part 101 and the 2nd end part 102 arrange
- a central portion of the convex portion 100 between the first end portion 101 and the second end portion 102 is disposed at the tire maximum width position H.
- a line passing through the tire maximum width position H and parallel to the rotation axis AX is defined as a parallel line LP.
- the parallel line LP passes through the carcass maximum width position E, the tire maximum width position H, and the convex portion maximum width position F.
- the end portion of the carcass folded portion 22 is preferably disposed on the inner side in the tire radial direction with respect to the parallel line LP including the carcass maximum width position E, the tire maximum width position H, and the convex portion maximum width position F.
- intersection of the parallel line LP and the carcass outer surface 21S is P1
- the intersection of the parallel line LP and the side surface 8S is P2
- the intersection of the parallel line LP and the convex outer surface 100S is P3.
- the intersection point P1 is positioned at the carcass maximum width position E arranged on the outermost side in the tire width direction in the carcass outer surface 21S.
- the intersection point P2 is positioned at the tire maximum width position H disposed on the outermost side in the tire width direction in the side surface 8S.
- the intersection P3 is positioned at the convex maximum width position F that is disposed on the outermost side in the tire width direction in the convex outer surface 100S.
- the distance between the tire center CL and the intersection P1 in the direction parallel to the rotation axis AX is W1
- the distance between the tire center CL and the intersection P2 in the direction parallel to the rotation axis AX is W2
- the direction parallel to the rotation axis AX is W3.
- the distance between the tire center CL and the intersection P3 is defined as W3.
- the distance between the intersection P1 and the intersection P2 is G1
- the distance between the intersection P2 and the intersection P3 is G2.
- the carcass cross-sectional width S1 corresponds to twice the distance W1
- the tire cross-sectional width S2 corresponds to twice the distance W2
- the total tire width S3 corresponds to twice the distance W3.
- the distance G1 is a difference between the distance W2 and the distance W1
- the convex part 100 is provided in the range of 0.1 ⁇ SH or more and 0.4 ⁇ SH or less in the tire radial direction.
- the convex portion 100 is provided in the range of ⁇ ⁇ SH or less from the tire maximum width position H to the tire radial direction outer side, and from the tire maximum width position H to the tire radial inner side.
- ⁇ and ⁇ are preferably equal.
- FIG. 6 is a view schematically showing the side surface 8S of the tire 1 provided with the convex portion 100
- FIG. 7 is an enlarged view of a part of FIG.
- a plurality of convex portions 100 are arranged in the tire circumferential direction.
- 12 [protrusions] 100 are provided. All of the plurality of convex portions 100 are connected to the side surface 8S so as to include the tire maximum width position H.
- Each of the plurality of convex portions 100 has a first end portion 101 and a second end portion 102 disposed outside the first end portion 101 in the tire radial direction.
- the distance L100 between the first end portion 101 and the second end portion 102 is larger than the width D100 of the convex portion 100 in the short direction.
- the convex part 100 has a long longitudinal shape in the tire radial direction.
- the width D100 in the short direction of the convex portion 100 is not less than 0.5 [mm] and not more than 5.0 [mm].
- the convex part 100 is arranged so that the first end part 101 and the second end part 102 coincide with the radiation LR with respect to the rotation axis AX.
- the central axis of the convex part 100 and the radiation LR are parallel.
- the convex portion 100 is provided on the side surface 8S of the side rubber 8. The decline in sex is suppressed. Further, the carcass 2 of the side portion 7 is sufficiently protected by the convex portion 100 and the side rubber 8.
- the carcass folding portion 22 does not extend to the tire maximum width position H, and the carcass body 21 and the side rubber 8 are connected at the tire maximum width position H.
- the amount of the carcass folding portion 22 increases, the weight of the tire 1 increases.
- the carcass folding portion 22 does not extend to the tire maximum width position H, an increase in the weight of the tire 1 is suppressed.
- the air resistance at the tire maximum width position H tends to increase.
- the longitudinal convex portion 100 so as to include the tire maximum width position H, an air flow promoting effect and a rectifying effect are obtained. Thereby, air resistance is reduced and the fuel consumption of the vehicle can be reduced.
- the air resistance tends to deteriorate.
- the long-width convex portion 100 is provided in the minimum width tire and the tire has a total tire width S3 equivalent to a tire (comparative tire) in which the long-shaped convex portion 100 does not exist, the air resistance is reduced. Significant deterioration is suppressed.
- W1 / W3 When W1 / W3 is larger than 0.95, the distance between the carcass outer surface 21S and the convex outer surface 100S is too short, and the carcass 2 is not sufficiently protected. If W1 / W3 is smaller than 0.80, the distance between the carcass outer surface 21S and the convex outer surface 100S will be too long, and it will be difficult to reduce the weight of the tire 1. When the condition of the formula (1) is satisfied, the weight of the tire 1 can be reduced while sufficiently protecting the carcass 2.
- G1 / G2 is smaller than 0.1, the thickness of the side rubber 8 is too thin, and the carcass 2 is not sufficiently protected.
- G1 / G2 is larger than 1, the thickness of the side rubber 8 becomes larger than the height of the convex part 100, and the weight reduction of the tire 1 becomes difficult.
- the carcass 2 on the two side portions 7 can be sufficiently protected while the side rubber 8 is thinned to reduce the weight.
- the convex portion 100 in the range of 0.1 ⁇ SH or more and 0.4 ⁇ SH or less in the tire radial direction, the weight of the tire 1 is reduced, and the function of the convex portion 100 is sufficiently exhibited. Is done.
- the convex portion 100 is provided in a range larger than 0.4 ⁇ SH, the weight of the tire 1 is increased, while the rigidity reduction suppressing function, the cut resistance reduction suppressing function, and the carcass protection function, which are functions of the convex portion 100, are provided. The remarkable improvement cannot be expected.
- the convex portion 100 is provided in a range smaller than 0.1 ⁇ SH, the carcass protection function is not exhibited.
- the convex part 100 in the range of 0.1 ⁇ SH or more and 0.4 ⁇ SH or less, both the weight reduction of the tire 1 and the function of the convex part 100 can be achieved.
- the width D100 in the short direction of the convex portion 100 is 0.5 [mm] or more and 5.0 [mm] or less, the air resistance is improved while suppressing an increase in the weight of the tire 1, and the vehicle The fuel consumption can be reduced.
- the width D100 in the short direction of the convex portion 100 is less than 0.5 [mm], the convex portion 100 is easily deformed, and it is difficult to obtain an air circulation promoting effect and a rectifying effect.
- the width D100 in the short direction of the convex part 100 exceeds 5.0 [mm], the convex part 100 becomes an air resistance, and the air flow promoting effect and the rectifying effect are not sufficiently obtained.
- the increase in the weight of the tire 1 will be brought about.
- the width D100 in the short direction of the convex portion 100 is 0.5 [mm] or more and 5.0 [mm] or less, the air resistance is improved while suppressing an increase in the weight of the tire 1, and the vehicle is low. Fuel consumption can be improved.
- the weight of the tire 1 can be reduced while suppressing a decrease in rigidity and cut resistance.
- the weight of the tire 1 can be reduced while sufficiently protecting the carcass 2.
- the side rubber cage of the conventional tire is thicker than 2.5 [mm]. By making the distance G1 smaller than the conventional side rubber gauge to 2.5 [mm] or less, the weight of the tire 1 can be reduced. If the distance G1 is smaller than 1.0 [mm], the side rubber 8 is too thin, and the carcass 2 is not sufficiently protected. When the conditions of the expressions (3) and (4) are satisfied, the carcass 2 can be sufficiently protected while being lightened.
- FIG. 8 is a diagram schematically showing the side surface 8S having the convex portion 100 according to the present embodiment.
- FIG. 9 is an enlarged view of a part of FIG.
- the convex portion 100 is inclined with respect to the radiation LR with respect to the rotation axis AX so that the positions of the first end portion 101 and the second end portion 102 are different in the tire circumferential direction.
- 12 [protrusions] 100 are provided.
- the direction in which the second end 102 shifts with respect to the first end 101 is the same for the plurality of convex portions 100. That is, the inclination directions of the plurality of convex portions 100 are the same.
- the long convex portion 100 By arranging the long convex portion 100 to be inclined, the carcass 2 is sufficiently protected and the rigidity deviation of the side portion 7 in the tire circumferential direction is suppressed. Since the deviation of rigidity in the tire circumferential direction is suppressed, when the tire 1 travels on the road surface, the deformation state of the side portion 7 becomes constant, so that the uniformity is improved. In addition, since the long convex portions 100 are arranged to be inclined, it is possible to suppress the rigidity of the side portions 7 in the tire radial direction from becoming excessively high. Therefore, when the tire 1 travels on the road surface, the side portion 7 can be appropriately deformed in the tire radial direction.
- the rigidity deviation of the side portions 7 with respect to the tire circumferential direction is further suppressed. Therefore, the uniformity is effectively improved.
- FIG. 10 shows another arrangement example of the convex portions 100.
- FIG. 11 is an enlarged view of a part of FIG. In the example shown in FIGS. 10 and 11, 24 [pieces] are provided. Further, among the plurality of convex portions 100, a certain convex portion 100 and at least a part of the convex portion 100 arranged next to the convex portion 100 in the tire circumferential direction overlap with each other in the tire radial direction.
- FIG. 12 shows another arrangement example of the convex portions 100.
- 48 [pieces] are provided. Also in the example shown in FIG. 12, the adjacent convex parts 100 overlap.
- the number of convex portions 100 can be arbitrarily set.
- the number of convex portions 100 arranged in the tire circumferential direction on the side surface 8S is preferably set in the range of 10 to 50.
- the number of the convex parts 100 is less than 10, the air circulation promoting effect and the rectifying effect are not sufficiently obtained.
- the number of the convex parts 100 exceeds 50 the convex parts 100 become air resistance, and even in this case, the air flow promoting effect and the rectifying effect are not sufficiently obtained.
- the increase in the weight of the tire 1 will be brought about.
- FIG. 13 shows another arrangement example of the convex portions 100. As shown in FIG. 13, among the plurality of convex portions 100, the inclination direction of some of the convex portions 100 may be different from the inclination direction of some of the convex portions 100.
- FIG. 14 shows another arrangement example of the convex portions 100.
- the convex portion 100 has a linear shape in a plane orthogonal to the rotation axis AX.
- the convex portion 100 may have a curved portion within a plane orthogonal to the rotation axis AX.
- the curve part may be provided with two or more.
- 12 [protrusions] 100 are provided in the tire circumferential direction.
- FIG. 15 and 16 show another arrangement example of the convex portions 100.
- the convex part 100 which has a curve part may be provided 24 [piece] in a tire peripheral direction, and as shown in FIG. 16, 36 [piece] may be provided.
- FIG. 17 and 18 show another arrangement example of the convex portions 100.
- the direction regarding the tire circumferential direction of some convex parts 100 and another one convex part 100 may differ from among the several convex parts 100 which have the same shape.
- the direction regarding the tire circumferential direction of the some convex part 100 which has the same shape may be arrange
- FIG. 19 is a diagram schematically showing the side surface 8S having the convex portion 100 according to the present embodiment.
- the tire 1 includes a plurality of convex portions 100 arranged in the tire circumferential direction and a plurality of concave portions 200 provided on the side surface 8S between the adjacent convex portions 100.
- the side surface 8S is dimple processed.
- the concave portion 200 is circular, and the depth dimension of the concave portion 200 is smaller than the height dimension of the convex portion 100.
- the air resistance of the vehicle is further suppressed, and fuel consumption can be reduced.
- the concave portion 200 in addition to the convex portion 100, the air flowing from the front side to the rear side of the vehicle becomes turbulent. As a result, a turbulent boundary layer is generated around the tire 1 and the spread of air is suppressed. By suppressing the spread of the air passing therethrough, the air resistance of the vehicle can be reduced, and fuel consumption can be reduced.
- FIG. 20 is a diagram illustrating an example of the tire 1 according to the present embodiment.
- a plurality of convex portions 100 having curved portions are provided in the tire circumferential direction, the first ends 101 of adjacent convex portions 100 are connected to each other, and the second ends of the adjacent convex portions 100 are connected.
- the units 102 may be connected to each other. That is, an integrally formed annular convex portion 1000 having a plurality of curved portions may be provided on the side surface 8S.
- the plurality of convex portions 100 have the same shape. Adjacent convex portions 100 are arranged such that their directions in the tire circumferential direction are different.
- the distance Ha between the tire maximum width position H and the first end portion 101 and the distance Hb between the tire maximum width position H and the second end portion 102 are equal in the tire radial direction.
- the distance Ha may be larger or smaller than the distance Hb.
- annular convex portion 1000 in which a plurality of convex portions 100 are combined may be provided. Also in this embodiment, rigidity and cut resistance are improved by the annular convex portion 1000.
- all of the plurality of convex portions 100 are arranged so as to include the tire maximum width position H.
- some of the convex portions 100 may be arranged so as to include the tire maximum width position H, and some of the convex portions 100 may be arranged so as not to include the tire maximum width position H.
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
- Evaluation Test 1 An evaluation test for the above-described equations (1) and (2) will be described. In the evaluation test, an evaluation test for confirming “cut resistance” and “tire weight reduction rate” was performed for each of the cases where the conditions of the expressions (1) and (2) were satisfied and those where the conditions were not satisfied.
- G1 / G2 is “0.09”, “0.10”, “0.11”, “0.50”, “0.99”, “1.00”, “1.01”.
- W1 / W3 is “0.79”, “0.80”, “0.81”, “0.85”, “0.90”, “0.94”, “0.95”.
- ”And“ 0.96 ” were evaluated for“ cut resistance ”and“ tire weight reduction rate ”.
- the range in which the convex part 100 is provided regarding the tire radial direction is the same, the number of the convex parts 100 arranged in the tire circumferential direction is the same, and the width in the short direction of the convex part 100 is the same. is there.
- the range in which the convex portions 100 are provided in the tire radial direction is “0.3 ⁇ SH”, the number of the convex portions 100 arranged in the tire circumferential direction is “30”, and the width in the short direction of the convex portions 100 is “3.0 mm”.
- each tire 1 having the above-described conditions is assembled to a regular rim, filled with a regular internal pressure, mounted on a test vehicle, a traveling speed of 20 km / h, and an approach angle of 30. It climbed on a curbstone with a height of 110 [mm] at [°] and observed cracks (crack length and depth) generated in the side portion 7 of the tire 1. And based on this observation result, the tire 1 which a crack generate
- the weight reduction rate of the tire 1 having the above-mentioned conditions with respect to the conventional tire was evaluated based on the conventional tire in which the convex portion 100 does not exist.
- the total tire width S3 of the tire 1 having the above-described conditions is the same as the total tire width of the conventional tire.
- the tire 1 in which the tire weight reduction rate is less than the prescribed value with respect to the conventional tire is designated as “X”, and the tire 1 that satisfies the prescribed value is designated as “ ⁇ ”.
- the evaluation result is “ ⁇ ”
- the tire weight reduction rate is excellent.
- FIG. 21 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1 / G2” is 0.09.
- FIG. 22 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1 / G2” is 0.10.
- FIG. 23 shows “cut resistance” and “weight reduction ratio of tire” when “W1 / W3” is changed when “G1 / G2” is 0.11.
- FIG. 24 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1 / G2” is 0.50.
- FIG. 21 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1 / G2” is 0.09.
- FIG. 25 shows “cut resistance” and “weight reduction ratio of the tire” when “W1 / W3” is changed when “G1 / G2” is 0.99.
- FIG. 26 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1 / G2” is 1.00.
- FIG. 27 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1 / G2” is 1.01.
- evaluation test 2 An evaluation test for the above-described equations (3) and (4) will be described. In the evaluation test, an evaluation test for confirming “cut resistance” and “tire weight reduction rate” was performed for each of the cases where the conditions of the formulas (3) and (4) were satisfied and the cases where the conditions were not satisfied.
- FIG. 28 shows “cut resistance” and “weight reduction ratio of tire” when “W1 / W3” is changed when “G1” is 0.99 mm.
- FIG. 29 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1” is 1.00 mm.
- FIG. 30 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1” is 1.01 mm.
- FIG. 31 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1” is 2.00 mm.
- FIG. 28 shows “cut resistance” and “weight reduction ratio of tire” when “W1 / W3” is changed when “G1” is 0.99 mm.
- FIG. 29 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1” is 1.00 mm.
- FIG. 30 shows “cut resistance” and “tire weight reduction ratio” when “W
- FIG. 32 shows “cut resistance” and “weight reduction ratio of tire” when “W1 / W3” is changed when “G1” is 2.49 mm.
- FIG. 33 shows “cut resistance” and “weight reduction ratio of tire” when “W1 / W3” is changed when “G1” is 2.50 mm.
- FIG. 34 shows “cut resistance” and “tire weight reduction ratio” when “W1 / W3” is changed when “G1” is 2.51 mm.
- Evaluation Test 3 An evaluation test for providing the convex portion 100 in a “range of 0.1 ⁇ SH to 0.4 ⁇ SH” in the tire radial direction will be described. In the evaluation test, an evaluation test for confirming the “weight” and “tire stiffness” of the tire was performed for each of the cases where “range of 0.1 ⁇ SH or more and 0.4 ⁇ SH or less” was satisfied or not satisfied. .
- the numerical value x multiplied by the cross-sectional height SH is “0.09”, “0.10”, “0.11”, “0.39”, “0.40”, “0.41”, “0.50”. ”And“ 0.60 ”,“ weight ”and“ tire stiffness ”were evaluated.
- ⁇ indicates that the weight of the tire 1 when the size of the convex portion 100 is increased or decreased satisfies the specified value, and “ ⁇ ” indicates that the weight does not satisfy the specified value.
- the tire 1 having the above-mentioned conditions is assembled to a regular rim, filled with a regular internal pressure, and tested at a speed of 120 [km / h] and a load load of 5 [kN] using a drum tester.
- the test is started until the tire 1 is damaged while increasing the speed every 10 km / h every 24 hours, and the travel distance when the tire 1 is damaged is measured. And based on this measurement, when the travel distance satisfied the specified value, “ ⁇ ” was given, and when the running distance was not satisfied, “X” was given.
- the number of protrusions 100 arranged in the tire circumferential direction is the same, and the width of the protrusions 100 in the short direction is the same.
- the number of the convex parts 100 arranged in the tire circumferential direction was “30”, and the width of the convex part 100 in the short direction was “3.0 mm”.
- “W1 / W3” is a value (0.9) that satisfies the conditions of the above-described equations (1) and (3)
- “G1 / G2” is the value of the above-mentioned equation (2). The value is satisfied (0.5), and “G1” is a value (1.5 mm) that satisfies the condition of the above-described expression (4).
- Fig. 35 shows the results of the evaluation test.
- the tire stiffness is good, but the weight exceeds the specified value.
- the numerical value x is larger than 0.4, although the weight increases, no significant improvement in tire rigidity was observed.
- the numerical value x is smaller than 0.1, the tire 1 is reduced in weight, but the tire rigidity does not satisfy the specified value.
- the convex portion 100 satisfies the “range of 0.1 ⁇ SH or more and 0.4 ⁇ SH or less” with respect to the tire radial direction, thereby suppressing the weight of the tire 1 and suppressing the rigidity of the tire 1 as a function of the convex portion. It was confirmed that the decrease in “function” can be suppressed.
- Evaluation Test 4 An evaluation test for the number of convex portions 100 arranged in the tire circumferential direction being “10 or more and 50 or less” will be described. In the evaluation test, the “light weight reduction” of the tire 1 and the “fuel consumption” of the vehicle on which the tire 1 is mounted are confirmed for each of the cases where the number of the convex portions 100 satisfies “10 or more and 50 or less”. An evaluation test was conducted.
- the tire 1 having the above-mentioned conditions is assembled to a regular rim, filled with a regular internal pressure, mounted on a test vehicle, and traveled at a traveling speed of 40 km / h and a traveling distance of 1000 km.
- the fuel consumption when driving was measured.
- “ ⁇ ” was given, and when the fuel consumption did not satisfy the specified value, “ ⁇ ” was given.
- the range in which the convex portion 100 is provided in the tire radial direction is the same, and the width in the short direction of the convex portion 100 is the same.
- the range in which the convex portion 100 is provided in the tire radial direction is “0.3 ⁇ SH”, and the width in the short direction of the convex portion 100 is “3.0 mm”.
- W1 / W3 is a value (0.9) that satisfies the conditions of the above-described equations (1) and (3)
- “G1 / G2” is the value of the above-mentioned equation (2). The value is satisfied (0.5), and “G1” is a value (1.5 mm) that satisfies the condition of the above-described expression (4).
- Fig. 36 shows the results of the evaluation test. As shown in FIG. 36, it was confirmed that the weight of the tire 1 did not satisfy the specified value and the fuel consumption deteriorated in each of the cases where the number of convex portions 100 was less than 10 and more than 50.
- the tire 1 having the above-mentioned conditions is assembled to a regular rim, filled with a regular internal pressure, mounted on a test vehicle, and traveled at a traveling speed of 40 km / h and a traveling distance of 1000 km.
- the fuel consumption when driving was measured.
- “ ⁇ ” was given, and when the fuel consumption did not satisfy the specified value, “ ⁇ ” was given.
- the range in which the convex portions 100 are provided in the tire radial direction is the same, and the number of convex portions 100 arranged in the tire circumferential direction is the same.
- the range in which the convex portions 100 are provided in the tire radial direction was “0.3 ⁇ SH”, and the number of convex portions 100 arranged in the tire circumferential direction was “30”.
- “W1 / W3” is a value (0.9) that satisfies the conditions of the above-described equations (1) and (3)
- “G1 / G2” is the value of the above-mentioned equation (2). The value is satisfied (0.5), and “G1” is a value (1.5 mm) that satisfies the condition of the above-described expression (4).
- Fig. 37 shows the results of the evaluation test.
- the weight of the tire 1 is a specified value in each of the case where the width in the short direction of the convex portion 100 is smaller than 0.5 [mm] and larger than 5.0 [mm]. It was not satisfied and it was confirmed that fuel consumption deteriorated.
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Abstract
Description
0.80 ≦W1/W3 ≦ 0.95 …(1)、且つ、
0.1 ≦ G1/G2 ≦1 …(2)、
の条件を満足する、空気入りタイヤを提供する。
0.80 ≦W1/W3 ≦ 0.95 …(3)、且つ、
1.0[mm] ≦ G1 ≦2.5[mm] …(4)、
の条件を満足する、空気入りタイヤを提供する。
第1実施形態について説明する。図1は、本実施形態に係る車両500の一例を示す側面図である。図2は、本実施形態に係る車両500を後方から見た図である。タイヤ1が車両500に装着される。タイヤ1は、空気入りタイヤである。車両500に装着されたタイヤ1は、回転軸AXを中心に回転して、路面RSを走行する。
0.80 ≦W1/W3 ≦ 0.95 …(1)
0.1 ≦ G1/G2 ≦1 …(2)
の条件を満足するように、距離W1、距離W2、及び距離W3が定められている。
凸部100を有するタイヤ1において、
0.80 ≦W1/W3 ≦ 0.95 …(3)
1.0[mm] ≦ G1 ≦2.5[mm] …(4)
の条件を満足するように、距離W1、距離W2、及び距離W3が定められてもよい。
図8は、本実施形態に係る凸部100を有するサイド面8Sを模式的に示す図である。図9は、図8の一部を拡大した図である。図8及び図9に示すように、タイヤ周方向に関して第1端部101と第2端部102との位置が異なるように、凸部100は、回転軸AXに対する放射線LRに対して傾斜する。図8及び図9に示す例では、凸部100は、12[個]設けられている。
図19は、本実施形態に係る凸部100を有するサイド面8Sを模式的に示す図である。図19に示すように、タイヤ1は、タイヤ周方向に配置される複数の凸部100と、隣り合う凸部100の間のサイド面8Sに設けられた複数の凹部200とを備えている。
図20は、本実施形態に係るタイヤ1の一例を示す図である。図20に示すように、曲線部を有する凸部100がタイヤ周方向に複数設けられ、隣り合う凸部100の第1端部101同士が接続されるとともに、隣り合う凸部100の第2端部102同士が接続されてもよい。すなわち、複数の曲線部を有する一体成形された環状凸部1000が、サイド面8Sに設けられてもよい。複数の凸部100は同一形状である。隣り合う凸部100はタイヤ周方向に関する向きが異なるように配置される。
本発明に係るタイヤ1についての評価試験を行った。以下、評価試験の内容及び結果について説明する。
上述の(1)式及び(2)式についての評価試験について説明する。評価試験では、(1)式及び(2)式の条件を満足する場合及び満足しない場合のそれぞれについて、「耐カット性」及び「タイヤ軽量化率」を確認する評価試験を行った。
上述の(3)式及び(4)式についての評価試験について説明する。評価試験では、(3)式及び(4)式の条件を満足する場合及び満足しない場合のそれぞれについて、「耐カット性」及び「タイヤ軽量化率」を確認する評価試験を行った。
凸部100がタイヤ径方向に関して「0.1×SH以上0.4×SH以下の範囲」に設けられることについての評価試験について説明する。評価試験では、「0.1×SH以上0.4×SH以下の範囲」を満足する場合及び満足しない場合のそれぞれについて、タイヤの「重量」及び「タイヤ剛性」を確認する評価試験を行った。
タイヤ周方向に配置される凸部100の数が「10以上50以下」であることについての評価試験について説明する。評価試験では、凸部100の数が「10以上50以下」を満足する場合及び満足しない場合のそれぞれについて、タイヤ1の「軽量化」及びタイヤ1が装着された車両の「燃費」を確認する評価試験を行った。
凸部100の短手方向の幅は、「0.5[mm]以上5.0[mm]以下」であることについての評価試験について説明する。評価試験では、凸部100の短手方向の幅が「0.5[mm]以上5.0[mm]以下」を満足する場合及び満足しない場合のそれぞれについて、タイヤ1の「軽量化」及びタイヤ1が装着された車両の「燃費」を確認する評価試験を行った。
2 カーカス
3 ベルト層
4 ベルトカバー
5 ビード部
6 トレッドゴム
7 サイド部
8 サイドゴム
8S サイド面
9 サイドウォール部
10 トレッド部
11 接地面(踏面)
12 陸部
13 センター部
14 ショルダー部
15 溝
21 カーカス本体部
21S カーカス外面
22 カーカス折り返し部
31 第1ベルトプライ
32 第2ベルトプライ
51 ビードコア
52 ビードフィラー
100 凸部
100S 凸部外面
101 第1端部
102 第2端部
200 凹部
AX 回転軸
CL タイヤ中心(タイヤ赤道面)
E カーカス最大幅位置
H タイヤ最大幅位置
F 凸部最大幅位置
LP 平行線
OD タイヤ外径
R リムチェックライン
RD タイヤリム径
S1 カーカス断面幅
S2 タイヤ断面幅
S3 タイヤ総幅
SH 断面高さ
T 接地端
TW1 トレッド接地幅
TW2 トレッド展開幅
Claims (7)
- 回転軸を中心に回転可能であり、トレッド部及びタイヤ幅方向に関して前記トレッド部の両側に配置されるサイド部を有する空気入りタイヤであって、
カーカス本体部、及びビードコアで折り返されることにより形成されるカーカス折り返し部を有するカーカスと、
前記カーカス本体部のカーカス外面と接続され、タイヤ最大幅位置が位置付けられるサイド面を有するサイドゴムと、
前記サイド面に接続され、前記サイド面から突出し、タイヤ周方向に配置される複数の凸部と、
を備え、
複数の前記凸部のうち少なくとも一つの凸部は、前記タイヤ最大幅位置を含むように前記サイド面に接続され、
複数の前記凸部はそれぞれ、第1端部、及びタイヤ径方向に関して前記第1端部の外側に配置される第2端部を有し、
前記回転軸と直交する面内において、前記第1端部と前記第2端部との距離は、前記凸部の短手方向の幅よりも大きく、
前記タイヤ幅方向のタイヤ中心をCL、
前記タイヤ最大幅位置を通り前記回転軸と平行な平行線LPと前記カーカス外面との交点をP1、
前記平行線LPと前記サイド面との交点をP2、
前記タイヤ幅方向に関して最も外側に配置され、前記平行線LPと前記凸部の凸部外面との交点をP3、
前記回転軸と平行な方向に関して前記タイヤ中心CLと前記交点P1との距離をW1、
前記回転軸と平行な方向に関して前記タイヤ中心CLと前記交点P2との距離をW2、
前記回転軸と平行な方向に関して前記タイヤ中心CLと前記交点P3との距離をW3、
前記交点P1と前記交点P2との距離をG1、
前記交点P2と前記交点P3との距離をG2、
としたとき、
0.80 ≦W1/W3 ≦ 0.95、且つ、
0.1 ≦ G1/G2 ≦1、
の条件を満足する、
空気入りタイヤ。 - 回転軸を中心に回転可能であり、トレッド部及びタイヤ幅方向に関して前記トレッド部の両側に配置されるサイド部を有する空気入りタイヤであって、
カーカス本体部、及びビードコアで折り返されることにより形成されるカーカス折り返し部を有するカーカスと、
前記カーカス本体部のカーカス外面と接続され、タイヤ最大幅位置が位置付けられるサイド面を有するサイドゴムと、
前記サイド面に接続され、前記サイド面から突出し、タイヤ周方向に配置される複数の凸部と、
を備え、
複数の前記凸部のうち少なくとも一つの凸部は、前記タイヤ最大幅位置を含むように前記サイド面に接続され、
複数の前記凸部はそれぞれ、第1端部、及びタイヤ径方向に関して前記第1端部の外側に配置される第2端部を有し、
前記回転軸と直交する面内において、前記第1端部と前記第2端部との距離は、前記凸部の短手方向の幅よりも大きく、
前記タイヤ幅方向のタイヤ中心をCL、
前記タイヤ最大幅位置を通り前記回転軸と平行な平行線LPと前記カーカス外面との交点をP1、
前記平行線LPと前記サイド面との交点をP2、
前記タイヤ幅方向に関して最も外側に配置され、前記平行線LPと前記凸部の凸部外面との交点をP3、
前記回転軸と平行な方向に関して前記タイヤ中心CLと前記交点P1との距離をW1、
前記回転軸と平行な方向に関して前記タイヤ中心CLと前記交点P2との距離をW2、
前記回転軸と平行な方向に関して前記タイヤ中心CLと前記交点P3との距離をW3、
前記交点P1と前記交点P2との距離をG1、
前記交点P2と前記交点P3との距離をG2、
としたとき、
0.80 ≦W1/W3 ≦ 0.95、且つ、
1.0[mm] ≦ G1 ≦2.5[mm]、
の条件を満足する、
空気入りタイヤ。 - 複数の前記凸部の全部が、前記タイヤ最大幅位置を含むように前記サイド面に接続される、
請求項1又は請求項2に記載の空気入りタイヤ。 - 前記タイヤ径方向に関して最も内側の内端部と最も外側の外端部との距離を示すタイヤ断面高さをSHとしたとき、
前記凸部は、前記タイヤ径方向に関して0.1×SH以上0.4×SH以下の範囲に設けられる、
請求項1から請求項3のいずれか一項に記載の空気入りタイヤ。 - 前記サイド面において前記タイヤ周方向に配置される前記凸部の数は、10以上50以下である、
請求項1から請求項4のいずれか一項に記載の空気入りタイヤ。 - 前記凸部の短手方向の幅は、0.5[mm]以上5.0[mm]以下である、
請求項1から請求項5のいずれか一項に記載の空気入りタイヤ。 - 隣り合う前記凸部の間の前記サイド面に設けられた複数の凹部を備える、
請求項1から請求項6のいずれか一項に記載の空気入りタイヤ。
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US15/737,251 US11325429B2 (en) | 2015-07-22 | 2016-07-11 | Pneumatic tire |
CN201680035304.9A CN107709050B (zh) | 2015-07-22 | 2016-07-11 | 充气轮胎 |
DE112016003259.5T DE112016003259T5 (de) | 2015-07-22 | 2016-07-11 | Luftreifen |
KR1020177024094A KR101961689B1 (ko) | 2015-07-22 | 2016-07-11 | 공기입 타이어 |
US17/718,892 US11813897B2 (en) | 2015-07-22 | 2022-04-12 | Pneumatic tire |
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US17/718,892 Division US11813897B2 (en) | 2015-07-22 | 2022-04-12 | Pneumatic tire |
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JP7131395B2 (ja) * | 2019-01-07 | 2022-09-06 | 横浜ゴム株式会社 | 空気入りタイヤ |
CN110563832A (zh) * | 2019-07-31 | 2019-12-13 | 江苏璟泽生物医药有限公司 | 一种高纯度重组促卵泡刺激素纯化方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008265453A (ja) * | 2007-04-18 | 2008-11-06 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
JP2010247705A (ja) * | 2009-04-16 | 2010-11-04 | Bridgestone Corp | 空気入りタイヤ |
JP2012066731A (ja) * | 2010-09-24 | 2012-04-05 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2013071661A (ja) * | 2011-09-28 | 2013-04-22 | Yokohama Rubber Co Ltd:The | タイヤ/ホイール組立体 |
JP2014125108A (ja) * | 2012-12-26 | 2014-07-07 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2015033958A (ja) * | 2013-08-09 | 2015-02-19 | 株式会社ブリヂストン | ランフラットタイヤ |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT401367B (de) * | 1993-11-08 | 1996-08-26 | Semperit Ag | Radialluftreifen für pkw |
AT401368B (de) * | 1993-11-08 | 1996-08-26 | Semperit Ag | Radialluftreifen für pkw |
JP2006213128A (ja) * | 2005-02-02 | 2006-08-17 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
CA2508642A1 (en) * | 2005-06-09 | 2006-12-09 | Bela Bill Szoke | Airplane tire saver by protrusion airfoils |
US9016340B2 (en) * | 2007-07-30 | 2015-04-28 | Bridgestone Corporation | Pneumatic tire |
EP2425990B1 (en) * | 2009-04-30 | 2014-12-24 | Bridgestone Corporation | Tire |
JP5623867B2 (ja) | 2010-10-28 | 2014-11-12 | 株式会社ブリヂストン | 空気入りタイヤ |
JP5687246B2 (ja) * | 2012-06-21 | 2015-03-18 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP5833060B2 (ja) * | 2013-07-22 | 2015-12-16 | 株式会社ブリヂストン | ランフラットタイヤ |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008265453A (ja) * | 2007-04-18 | 2008-11-06 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
JP2010247705A (ja) * | 2009-04-16 | 2010-11-04 | Bridgestone Corp | 空気入りタイヤ |
JP2012066731A (ja) * | 2010-09-24 | 2012-04-05 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2013071661A (ja) * | 2011-09-28 | 2013-04-22 | Yokohama Rubber Co Ltd:The | タイヤ/ホイール組立体 |
JP2014125108A (ja) * | 2012-12-26 | 2014-07-07 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2015033958A (ja) * | 2013-08-09 | 2015-02-19 | 株式会社ブリヂストン | ランフラットタイヤ |
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JP2017024561A (ja) | 2017-02-02 |
US11813897B2 (en) | 2023-11-14 |
DE112016003259T5 (de) | 2018-04-26 |
US11325429B2 (en) | 2022-05-10 |
CN107709050B (zh) | 2020-07-07 |
US20180186194A1 (en) | 2018-07-05 |
JP6575196B2 (ja) | 2019-09-18 |
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