WO2012111296A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2012111296A1 WO2012111296A1 PCT/JP2012/000918 JP2012000918W WO2012111296A1 WO 2012111296 A1 WO2012111296 A1 WO 2012111296A1 JP 2012000918 W JP2012000918 W JP 2012000918W WO 2012111296 A1 WO2012111296 A1 WO 2012111296A1
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- WO
- WIPO (PCT)
- Prior art keywords
- belt
- tire
- tread
- width direction
- layer
- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
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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
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/1835—Rubber strips or cushions at the belt edges
- B60C9/185—Rubber strips or cushions at the belt edges between adjacent or radially below the belt plies
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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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
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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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/28—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by the belt or breaker dimensions or curvature relative to carcass
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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
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
- B60C2011/013—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered provided with a recessed portion
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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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
Definitions
- the present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire used for a heavy duty vehicle such as a truck or a bus provided with a circumferential belt layer and an angled belt layer on a radially outer side of a carcass layer.
- a carcass layer is provided in a toroidal shape between a pair of bead cores
- a circumferential belt layer is provided on the outer side in the tire radial direction of the carcass layer
- an inward slope is formed on the outer side in the tire radial direction of the circumferential belt layer.
- a pneumatic tire provided with a belt layer and an outer inclined belt layer (see Patent Document 1).
- the tread width is narrowed to suppress uneven wear.
- the belt end portion of the belt reinforcement layer prevents the buttress portion from penetrating the belt end portion due to distortion occurring at the belt end portion in the buttress portion where the tread is continuous with the sidewall.
- the shape of the buttress portion has an inclined structure including an inclined surface with a large inclination angle from the outer side in the tire radial direction toward the inner side.
- the circumferential belt layer has a function of efficiently maintaining the tire shape (equalizing the tire diameter growth amount of the tread portion), but on the other hand, since the shear rigidity is hardly exhibited, it is required.
- an angled belt layer is required.
- the angled belt layer In order to determine the wear resistance performance of the pneumatic tire, the angled belt layer requires a belt width of a certain degree or more with respect to the tire width, and further, a plurality of layers need to be arranged to cross each other.
- the circumferential belt layer also has the function of making the contact pressure of the tread uniform when the tire contacts the load.
- the belt width of the circumferential belt layer is narrow, the contact pressure of the tread Although it becomes high in the region where the layer exists, it becomes extremely low outside the region, and uneven wear in the tread occurs. Therefore, the belt width of the circumferential belt layer needs to have a certain width with respect to the tire width, and the ratio (circumferential belt layer width / tire width) increases as the flattening of the pneumatic tire proceeds.
- the tread width is narrowed for the purpose of reducing the wear volume. For this reason, in order to prevent the buttress part from penetrating the belt end, However, in this buttress shape, it is inevitable that the contact pressure on the shoulder end side of the tread is lowered. When the contact pressure on the shoulder end side of the tread decreases, the flow of the tread rubber in the tire circumferential direction on the shoulder end side decreases, and uneven wear in which the shoulder end side of the tread wears more easily occurs. It is necessary to increase the contact pressure on the side.
- An object of the present invention is to provide a belt layer structure that makes it possible to make both uneven wear difficult to occur in a tread shoulder and to improve tire durability, and an air having a buttress shape adapted to such a belt layer structure. Is to provide tires.
- a pneumatic tire according to the present invention includes at least one belt reinforcing layer disposed on the outer side in the tire radial direction of the carcass, and at least one disposed on the outer side in the tire radial direction of the belt reinforcing layer.
- the belt has a belt width of 70% to 95% of the maximum tire width in the cross section in the tire width direction, and the outer end portion in the tire width direction of the belt reinforcing layer is more tire than the outer circumferential groove in the tire width direction.
- the bat is located on the outer side in the tire width direction of the tread and the surface of the tread is continuous with the sidewall.
- a scan unit, in the tire width direction cross-section, wherein it becomes that there is no concave entering from the tire width direction outer end of the surface of the tread to the tire width direction inner side, is characterized in that formed by the outer surface shape.
- the outer surface shape of the buttress portion has an inclination angle of 75 degrees or more and 90 degrees or less with respect to the surface of the tread in a cross section in the tire width direction. It is a feature.
- the shortest distance between the inclined belt layer having the widest belt width and the outer surface of the buttress portion in the inclined belt layer is 10 mm or more and 20 mm or less. It is a feature.
- the distance from the outer end in the tire width direction on the surface of the tread to the belt end of the belt reinforcing layer is 0 mm or more and 25 mm or less. Yes.
- a pneumatic tire according to another aspect of the present invention is characterized in that the belt end portion of the belt reinforcing layer has an interlayer thickness of 3.0 mm or more.
- the buttress portion that is located on the outer side in the tire width direction of the tread and continues the surface of the tread to the sidewall is a tire cross section in the tire width direction from the outer end in the tire width direction on the surface of the tread. Because it is formed with an outer surface shape that does not enter the inner side in the width direction, tread separation failure that occurs when the belt reinforcement layer is widened, and lateral force (SF) when mounted on the steer shaft It is possible to appropriately cope with the occurrence of uneven wear due to the occurrence, and it can be used until the tread is completely worn.
- the outer surface shape of the buttress portion has an inclination angle of not less than 75 degrees and not more than 90 degrees with respect to the surface of the tread in the tire width direction cross section. Since the decrease in the contact pressure at the tread end is suppressed, uneven wear can be made difficult to occur in the tread, and the uneven wear resistance of the tread can be improved.
- the shortest distance between the inclined belt layer having the widest belt width in the inclined belt layer and the outer surface of the buttress portion is 10 mm or more and 20 mm or less. The compression elastic modulus can be reduced while securing a rubber gauge required at the belt end of the inclined belt layer having the widest belt width.
- the distance from the outer end in the tire width direction on the surface of the tread to the belt end of the belt reinforcing layer is set to 0 mm or more and 25 mm or less. While reducing the elastic modulus, it is possible to secure the distance between the belt end portion of the inclined belt layer having the widest belt width and the outer surface of the buttress portion.
- the belt end portion of the belt reinforcing layer has an interlayer thickness of 3.0 mm or more, so the belt width of the belt reinforcing layer is 70% of the tire width.
- FIG. 1 is a cross-sectional view of a tire half width along a tread width direction schematically showing an internal configuration of a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the tire half width along the tread width direction similar to FIG. 1, showing the inclined surface structure of the buttress portion of FIG. 1. It is sectional drawing similar to FIG. 2 which shows the other example of interlayer rubber.
- FIG. 1 is a cross-sectional view of the tire half width along the tread width direction schematically showing the internal configuration of the pneumatic tire according to one embodiment of the present invention.
- the carcass 11 of the pneumatic tire 10 includes, for example, a single carcass ply extending in a toroidal manner between a pair of bead portions (not shown), and can have a radial structure.
- a belt reinforcing layer (circumferential belt layer) 12 having a two-layer structure is disposed on the outer peripheral side of the crown region where the tread is formed of the carcass 11, that is, on the outer side in the tire radial direction.
- the belt reinforcing layer 12 is formed, for example, in a tread circumferential direction, in which a ribbon-shaped strip having a width of 3 mm or more and 20 mm or less in which a plurality of cords arranged in parallel are covered with rubber is spirally wound around a tire axis. It can be formed by a cord extending at an angle of 5 degrees or less.
- the belt reinforcing layer 12 is not limited to two layers, and may be one or more layers.
- the cord of the belt reinforcing layer 12 stretches greatly with a small tensile force until the cord stretch rate reaches around 2%, but after the stretch rate is exceeded, the stretch rate is increased even with a large tensile force.
- the so-called large initial elongation, long twist steel cord, high elongation steel cord, etc. it can be organic fiber cord, and zigzag shape, crank shape, wave shape, etc. in the tread circumferential direction It can also be a steel cord extending in a detoured form or extending linearly.
- the tire attached to the rim is attached to a JATMA (Tha Japan Automobile Manufacturers Association, Inc. .), TRA (The Tire and Rim Association, Inc.), ETRTO (The European Tire and Rim Technical Organization), etc., with the maximum air pressure specified by YEAR BOOK etc. It is preferable to sufficiently exhibit the diameter growth suppressing function in the use state of the pneumatic tire in the belt reinforcing layer. Thereby, the function which suppresses tire diameter growth can fully be exhibited in a belt reinforcement layer.
- the belt reinforcing layer 12 has a length in the tire width direction of 70% or more and 95% or less of the tire width in the tire width direction cross section in a ground contact state with a normal internal pressure, preferably 75% or more and 95% or less of the tire width. It has a certain belt width.
- the normal internal pressure is an air pressure defined by each tire size for each tire size. If JATMA, the maximum air pressure is specified. If the value is ETRTO, it shall say “INFLATION PRESSURE”.
- an inclined belt layer 13a (first angled belt layer) made of a cord extending at an inclination angle of, for example, 40 degrees or more and 60 degrees or less with respect to the tread circumferential direction.
- An inclined belt layer 13b (second angled belt layer) is disposed.
- the two inclined belt layers 13a and 13b are laminated so that the cords forming each of them extend in opposite directions to the circumferential direction of the tread and intersect at the upper and lower layers.
- the inclined belt layer is not limited to two layers, and one or more inclined belt layers may be provided.
- the belt width of the inclined belt layer 13a which is located in the inner layer adjacent to the belt reinforcing layer 12 and has a wider belt width, which is the length in the tire width direction, is the belt reinforcing layer 12.
- the belt width of the inclined belt layer 13b positioned outside the inclined belt layer 13a is not narrower than the belt width of the belt reinforcing layer 12 (see FIG. 1). That is, at least one of the two inclined belt layers 13 a and 13 b is formed wider than the belt reinforcing layer 12.
- the belt edge part of the inclination belt layer 13a is located 5 mm or more and 30 mm or less inside the tire width direction from the belt edge part of the inclination belt layer 13b.
- a belt reinforcing layer 12 extending linearly in the tire width direction, and an inclined belt layer 13a extending along the carcass 11 (that is, the belt width is wider than the belt reinforcing layer 12)
- An interlayer rubber 14 is disposed between the layers of the inclined belt layer, which is the widest inclined belt layer).
- the interlayer rubber 14 has a modulus at 100% elongation (Mod.) At a temperature of 25 ° C. measured by a method according to JIS K6251 standard in a range of 1.5 MPa or more and 5.0 MPa or less, for example, 5.0 MPa or less.
- the interlayer rubber 14 is a tire in which the belt reinforcing layer 12 side, that is, the inner side in the tire radial direction is formed of an inclined surface that increases the interlayer thickness (gauge: Ga.) From the center side in the tire width direction toward the end side.
- the cross section along the width direction is formed in a wedge shape, and the maximum interlayer thickness (interlayer thickness at the belt outer end) of the belt reinforcing layer 12 is secured to 3.0 mm or more.
- tread rubber On the outer side in the tire radial direction of these inclined belt layers 13a and 13b, tread rubber forming a tread 15 whose surface is a tire ground contact surface is disposed, and the tread 15 is spaced apart in the tire width direction, respectively.
- tread rubber forming a tread 15 whose surface is a tire ground contact surface is disposed, and the tread 15 is spaced apart in the tire width direction, respectively.
- the tread 15 is demarcated by the seven ridges (see FIG. 1).
- the tread width straddling the outermost end position of the belt reinforcing layer 12 on the tread 15 by the shoulder circumferential groove 16 disposed on the outermost side in the tread width direction and continuously extending in the tread circumferential direction.
- a tread shoulder land portion 18 located at the outer end in the direction is defined. That is, the end of the belt reinforcing layer 12 in the tire width direction is located on the outer side in the tire width direction from the shoulder circumferential groove 16 that is the outermost tire circumferential groove formed in the tread 15 in the tread width direction.
- the surface of the tread shoulder land portion 18 is formed by an inclined surface that is gently uphill from the tread shoulder side toward the tread center side to allow a curved surface to constitute a tire contact surface, and the tread shoulder land portion 18. As described above, the belt outer end portions of the inclined belt layers 13 a and 13 b reach the inner side in the tire radial direction of the tread shoulder land portion 18.
- the belt reinforcing layer 12 has one or a plurality of arrangement layers, and the outermost edge in the tread width direction is attached to a rim on a product tire with JATMA, TRA, It is preferable that the tire diameter growth rate when filled with the highest air pressure defined by the standard YEAR BOOK, etc., such as ETRTO, is positioned on the outer side in the tread width direction than the position where A% described later.
- This A% here corresponds to the tire diameter corresponding to the elongation (%) when the cord forming the belt reinforcing layer 12 is subjected to a tensile test and the cord exhibits an elastic modulus of 10% of the breaking elastic modulus EI. It means the growth rate.
- the outer side in the tire width direction of the tread end TE which is the outer end in the tire width direction of the tread shoulder land portion 18 is continuous to the sidewall 20 via the buttress portion 19, and the buttress portion 19 extends from the tread end TE to the tire diameter. After extending in a substantially straight line toward the inner side in the direction, it is bent in a circular arc shape on the outer side in the tire width direction and is formed in a J shape in a cross section in the tire width direction following the sidewall 20.
- the buttress portion 19 extends from the tread end TE to the innermost position in the tire radial direction of the inclined belt layer in the tire radial direction.
- the buttress portion 19 that is located on the outer side in the tire width direction of the tread 15 and continues the surface 15a of the tread 15 to the sidewall 20 is a tire width direction outer end (tread end TE) of the surface 15a of the tread 15 in a cross section in the tire width direction.
- the concave shape that does not enter the tire width direction inner side means that the buttress portion outer surface 19a (whole) is located on the inner side in the tire width direction from a straight line e (see FIG. 2) described later.
- FIG. 2 is a cross-sectional view of the tire half width along the tread width direction similar to FIG. 1, showing the inclined surface structure of the buttress portion of FIG.
- the buttress portion 19 has an inclination angle ⁇ of the buttress portion outer surface 19a, that is, an angle ⁇ formed by a straight line a passing through the tread end TE and a straight line b extending along the buttress portion outer surface 19a.
- the distance s for maintaining the inclination angle ⁇ is set to 90 degrees or less, and the distance s is set to 2 mm or more and 20 mm or less.
- the straight line a is a straight line connecting the tread end TE and the outer end in the tire width direction of the shoulder circumferential groove 16, and the straight line b passes through the innermost point in the tire radial direction at the groove bottom of the shoulder circumferential groove 16.
- the distance s is a distance of a perpendicular line dropped from the tread end TE to a straight line d perpendicular to the tire equator line CL passing through the outer end in the tire width direction of the inclined belt layer 13a.
- the straight line e is a straight line connecting the boundary q between the buttress portion 19 and the sidewall 20 and the tread end TE.
- the buttress portion 19 is formed not by an inclined surface having a large inclination angle from the outer side in the tire radial direction to the inner side but by a so-called inclined inclined surface.
- the distance t between the inclined belt layer 13a and the perpendicular line extending from the outer end in the tire width direction to the straight line b is 10 mm or more and 20 mm or less, that is, the inclined belt layer 13a having the widest belt width and the buttress portion outer surface 19a.
- the shortest distance is 10 mm or more and 20 mm or less.
- the distance between the straight line f passing through the tread end TE and parallel to the tire equator line CL and the outer end of the belt reinforcing layer 12 in the tire width direction that is, the distance u from the tread end TE to the belt end of the belt reinforcing layer 12.
- the distance u is a distance measured from the belt end of the belt reinforcing layer 12 toward the outside in the tire width direction.
- the interlayer rubber 14 is not limited to the wedge-shaped cross section described above, and may be formed in a triangular shape.
- FIG. 3 is a cross-sectional view similar to FIG. 2, showing another example of an interlayer rubber. As shown in FIG.
- the interlayer rubber 14 increases the interlayer thickness (gauge: Ga.) From the center side in the tire width direction to the end side on the belt reinforcing layer 12 side, that is, the inner side in the tire radial direction.
- the section along the tire width direction is formed in a substantially triangular shape having a downward convexity, which is composed of an inclined surface and an inclined surface that increases the interlayer thickness (gauge: Ga.) From the end side in the tire width direction toward the center side.
- the maximum interlayer thickness of the belt reinforcing layer 12 (interlayer thickness at the belt outer end) is secured to 3.0 mm or more. In this case, the maximum interlayer thickness of the belt reinforcing layer 12 is a distance from the bottom of the triangle to the diagonal vertex thereof, which is more preferable because air accumulation during manufacturing can be prevented.
- the pneumatic tire 10 having the above-described configuration has the belt width of the belt reinforcing layer 12 and the inclined belt layers 13a and 13b adjacent to the belt reinforcing layer 12, and the shape of the buttress portion 19 is optimized. In addition, it is possible to appropriately cope with the tread separation failure that occurs when the belt reinforcing layer 12 is widened, and the suppression of uneven wear that occurs when the lateral force (SF) is generated when the belt reinforcing layer 12 is attached to the steering shaft.
- the reason why the belt width of the belt reinforcing layer 12 is 70% or more and 95% or less of the tire width is that the contact pressure distribution on the surface of the tread 15 becomes non-uniform when the tire width is less than 70% of the tire width.
- the belt reinforcing layer 12 It is necessary to have a wide belt width.
- the belt width of the belt reinforcing layer 12 is wide, a large interlayer shear strain may occur at the belt end portion of the belt reinforcing layer 12 due to tire deformation caused by contact with a load in a state where a load is applied.
- the belt width of the belt reinforcing layer 12 is 70% or more of the tire width, an interlayer thickness of 3.0 mm or more is required at the belt end of the belt reinforcing layer 12, and the modulus of the interlayer rubber 14 is increased.
- the modulus at 100% elongation at a temperature of 25 ° C. measured by a method in accordance with JIS K6251 standard is 5.0 MPa or less.
- the inclined belt layer provided on the outer side in the tire radial direction of the belt reinforcing layer 12 is two or more layers (inclined belt layers 13a and 13b), and the inclined belt layer 13a adjacent to the belt reinforcing layer 12 is the belt reinforcing layer.
- the inclined belt layer 13b adjacent to the outer side in the tire radial direction of the inclined belt layer 13a is arranged so as to intersect the inclined belt layer 13a, thereby providing a function of uniforming the deformation of the surface of the tread 15 in the tire circumferential direction. It will be. The more uniform this deformation is, the more uniform the tread rubber is worn, and the tread 15 can be used until it is completely worn.
- the inclination angle of the inclined belt layers 13a and 13b with respect to the tread circumferential direction is set to 40 degrees or more and 60 degrees or less. If the inclination angle is 40 degrees or more, both tire wear performance and durability performance can be achieved. This is because the inclination angle is preferably 50 degrees or more. If the tilt angle is less than 40 degrees, shear strain may occur between the belt reinforcing layer 12 adjacent to the tilted belt layer 13a due to deformation caused by contact with a load in a state where a load is applied. May occur. On the other hand, when the inclination angle exceeds 60 degrees, a large compressive strain is applied to the crossing layer at the time of loading, and the steel cord breaks.
- the belt end of the inclined belt layer 13b is disposed at an inner side in the tire width direction of 5 mm or more, preferably 10 mm or more than the belt end of the inclined belt layer 13a, but more than 30 mm from the belt end of the inclined belt layer 13a. If the tread 15 is separated, the uneven wear of the tread 15 is deteriorated. Therefore, the tread 15 is positioned 30 mm or less on the inner side in the tire width direction from the belt end of the inclined belt layer 13a. This is because in the tire having such a belt structure, the belt reinforcing layer 12 is widely arranged, and the belt reinforcing layer 12 having tension strongly presses the tread 15 at the time of contact with a load, This is because the ground pressure at the tread end TE is increased.
- the tread width is narrowed for the purpose of reducing the wear volume.
- the inclination angle ⁇ of the buttress portion outer surface 19a is increased, that is, 75 degrees.
- a buttress portion shape of 90 degrees or less is preferable.
- the inclination angle ⁇ is defined within the range of 75 degrees or more and 90 degrees or less, the buttress portion outer surface 19a and the inclined belt layers 13a and 13b The distance between the belt ends becomes closer, and in some cases, there is a possibility that the buttress portion penetrates the belt end portion due to distortion generated at the belt end portion when a load is applied to the tire.
- the distance s for maintaining the inclination angle ⁇ is set to 2 mm or more and 20 mm or less.
- the distance s needs to be 2 mm or more, and the buttress portion penetration by the belt ends of the inclined belt layers 13 a and 13 b is prevented.
- the distance s needs to be 20 mm or less.
- the amount of tread rubber in the buttress portion 19 is reduced, and the compression elastic modulus on the outer side in the tire width direction from the belt end of the belt reinforcing layer 12 is compared with the conventional one.
- the amount of deformation in the tire circumferential direction on the surface of the tread 15 is increased to suppress the occurrence of uneven wear. If the inclination angle ⁇ is too large, a rubber gauge at the belt end of the inclined belt layer 13a having the widest belt width cannot be secured, and if it is too small, the compression elastic modulus cannot be reduced.
- the shortest distance between the inclined belt layer 13a having the widest belt width and the buttress portion outer surface 19a is 10 mm or more and 20 mm or less because the inclined belt layer 13a has the shortest distance from the buttress portion outer surface 19a.
- the distance u from the tread end TE to the belt end of the belt reinforcing layer 12 is set to 0 mm or more and 25 mm or less because the ground pressure is high in the region where the belt reinforcing layer 12 is arranged in the tire width direction. Since the contact pressure is lower outside the belt end portion of the belt reinforcing layer 12 in the tire width direction, uneven wear occurs in the tread shoulder land portion 18. Here, the belt reinforcing layer 12 extends from the belt end portion to the tread end. If the distance in the tire width direction to the TE is too long, the compression modulus cannot be reduced.
- a tire with a size of 355 / 50R22.5 for trucks and buses is assembled to a rim of 11.75 ⁇ 22.5, filling air pressure (internal pressure) is 900 kPa, normal load is about 39 kN, and drum speed is 65 km / h.
- air pressure internal pressure
- normal load is about 39 kN
- drum speed is 65 km / h.
- the buttress portion has a concave shape, that is, has a shape that linearly connects the boundary q between the tread end TE and the sidewall 20.
- the buttress part has a concave shape, that is, a shape that connects the boundary q between the tread end TE and the sidewall 20 in a concave curve shape.
- a concave shape that is, a shape that connects the boundary q between the tread end TE and the sidewall 20 in a concave curve shape.
- the width difference 1 is the belt width difference between the first angled belt layer and the belt reinforcing layer (the belt width of the first angled belt layer ⁇ the belt width of the belt reinforcing layer).
- 2 is a difference in belt width between the first angled belt layer and the second angled belt layer (belt width of the first angled belt layer ⁇ belt width of the second angled belt layer).
- the ratio of the belt reinforcing layer is the ratio of the belt width of the belt reinforcing layer to the tire width
- the end gauge of the interlayer rubber is the interlayer thickness at the belt end of the belt reinforcing layer.
- angle R50 indicates that the right upward inclination angle is 50 degrees
- L50 indicates that the left upward inclination angle is 50 degrees.
- a durable distance shows that a result is so favorable that a number is large, and the amount of wear shows that a result is so favorable that a number is small.
- the endurance distance was 100 (INDEX) in the conventional example and 90 and 95 in the comparative example, whereas the examples were improved to 105, 110 and 120, and the wear amount was also improved.
- the conventional example is 100 (INDEX), and the comparative example is 98,96, while the embodiment is surely improved to 94,90. That is, it has excellent durability and wear resistance.
- the pneumatic tire 10 having the above-described configuration is belt-reinforced on the outer side in the tire radial direction of the carcass layer, which makes it possible to make it difficult to cause uneven wear in the tread shoulder and to improve the tire durability performance.
- a pneumatic tire used in a heavy-duty vehicle having a buttress shape adapted to a belt layer structure including a layer (circumferential belt layer) and an angled belt layer could be obtained.
- it is useful as a pneumatic tire having a high flatness and a radial structure that is attached to the steering shaft.
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- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
このようなタイヤとして、例えば、一対のビードコア間にトロイダル状にカーカス層が設けられ、このカーカス層のタイヤ径方向外側に周方向ベルト層を備え、周方向ベルト層のタイヤ径方向外側に内側傾斜ベルト層及び外側傾斜ベルト層を備えた空気入りタイヤがある(特許文献1参照)。
また、タイヤにかかる負荷荷重が年々増大していることへの対応として、タイヤ耐久性の向上も求められている。
また、この発明の他の態様に係る空気入りタイヤは、前記傾斜ベルト層の中でベルト幅が最広幅の傾斜ベルト層とバットレス部外表面との最短距離を10mm以上、20mm以下とすることを特徴としている。
また、この発明の他の態様に係る空気入りタイヤは、前記トレッドの表面のタイヤ幅方向外側端から前記ベルト補強層のベルト端部までの距離を、0mm以上、25mm以下とすることを特徴としている。
また、この発明の他の態様に係る空気入りタイヤは、前記ベルト補強層のベルト端部において、3.0mm以上の層間厚みを有することを特徴としている。
また、この発明の他の態様に係る空気入りタイヤによれば、傾斜ベルト層の中でベルト幅が最広幅の傾斜ベルト層とバットレス部外表面との最短距離を10mm以上、20mm以下とするので、ベルト幅が最広幅の傾斜ベルト層のベルト端部で必要とするゴムゲージを確保しつつ、圧縮弾性率の低減を実現することができる。
また、この発明の他の態様に係る空気入りタイヤによれば、前記ベルト補強層のベルト端部において、3.0mm以上の層間厚みを有するので、ベルト補強層のベルト幅がタイヤ幅の70%以上の場合に、荷重付加状態での接地に伴うタイヤ変形が生じて、それによりベルト補強層のベルト端部に大きな層間せん断歪が発生するおそれがあったとしても、それを防止することができる。
図1は、この発明の一実施の形態に係る空気入りタイヤの内部構成を概略的に示す、トレッド幅方向に沿うタイヤ半幅分の断面図である。以下の説明においては、タイヤ半幅分において示されるタイヤ幅方向の一方の端部について説明するが、タイヤ幅方向の他方の端部においても同様の構成を有するものとし、その説明を省略する。
図1に示すように、空気入りタイヤ10のカーカス11は、図示しない一対のビード部間にトロイダルに延在する、例えば一枚のカーカスプライからなり、ラジアル構造とすることができる。
ここで、正規内圧とは、タイヤに関する各規格がタイヤサイズ毎に定めている空気圧であり、JATMAであれば最高空気圧、TRAであれば表“TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES”に記載の最大値、ETRTOであれば“INFLATION PRESSURE”を言うものとする。
層間ゴム14は、JIS K6251規格に準拠する方法で測定した、温度25℃での100%伸張時モデュラス(Mod.)が、1.5MPa以上、5.0MPa以下の範囲、例えば、5.0MPa以下のゴム部材からなり、ベルト補強層12と傾斜ベルト層13aの層間のベルト外側端部域に配置されている。この層間ゴム14は、ベルト補強層12側、即ち、タイヤ径方向内側が、タイヤ幅方向の中央側から端部側に向かって層間厚み(ゲージ:Ga.)を増大させる傾斜面からなる、タイヤ幅方向に沿う断面が楔形状に形成されており、ベルト補強層12の最大層間厚み(ベルト外側端部における層間厚み)を3.0mm以上確保している。
このトレッドショルダ陸部18の表面は、トレッドショルダ側からトレッドセンタ側へ向かってなだらかな上り傾斜の、曲面を可とする傾斜面により形成されて、タイヤ接地面を構成し、トレッドショルダ陸部18にかかるように、傾斜ベルト層13a,13bのベルト外側端部は、トレッドショルダ陸部18のタイヤ径方向内側に達している。
ここで、直線aは、トレッド端TEとショルダ周溝16のタイヤ幅方向外側端を結んだ直線であり、直線bは、ショルダ周溝16の溝底のタイヤ径方向最内側点を通り直線aに平行な直線cがバットレス部外表面19aと交わる点pと、トレッド端TEを結ぶ直線である。距離sは、トレッド端TEから、傾斜ベルト層13aのタイヤ幅方向外側端を通るタイヤ赤道線CLに垂直な直線dに降ろした垂線の距離である。直線eは、バットレス部19とサイドウォール20の境界qと、トレッド端TEを結ぶ直線である。
また、傾斜ベルト層13aのタイヤ幅方向外側端から直線bに下ろした垂線の距離tを、10mm以上、20mm以下、即ち、ベルト幅が最広幅の傾斜ベルト層13aとバットレス部外表面19aとの最短距離を、10mm以上、20mm以下としている。
更に、トレッド端TEを通りタイヤ赤道線CLと平行な直線fと、ベルト補強層12のタイヤ幅方向外側端との距離、即ち、トレッド端TEからベルト補強層12のベルト端部までの距離uを、0mm以上、25mm以下、好ましくは5~10mmとしている。なお、この距離uは、ベルト補強層12のベルト端部からタイヤ幅方向外側に向かって計った距離である。
なお、層間ゴム14は、上述した断面が楔形状のものに限るものではなく、三角形状に形成しても良い。
図3は、層間ゴムの他の例を示す、図2と同様の断面図である。図3に示すように、層間ゴム14は、ベルト補強層12側、即ち、タイヤ径方向内側が、タイヤ幅方向の中央側から端部側に向かって層間厚み(ゲージ:Ga.)を増大させる傾斜面と、タイヤ幅方向の端部側から中央側に向かって層間厚み(ゲージ:Ga.)を増大させる傾斜面からなる、タイヤ幅方向に沿う断面が下向き凸の略三角形状に形成されており、ベルト補強層12の最大層間厚み(ベルト外側端部における層間厚み)を3.0mm以上確保している。
なお、この場合、ベルト補強層12の最大層間厚みが三角形状の底辺からその対角頂点までの距離となることで、製造時の空気たまりを防止でき、より好ましい。
ベルト補強層12のベルト幅を、タイヤ幅の70%以上から95%以下としたのは、タイヤ幅の70%未満の場合、トレッド15の表面の接地圧分布が不均一となって、ベルト補強層12の無いトレッド15のタイヤ幅方向外側で偏摩耗が発生し、トレッド15が完全に摩耗するまで使用することが出来なくなるからであり、特に、偏平率の高いタイヤにおいては、ベルト補強層12のベルト幅が広いことが必要である。
一方、上述したような、傾斜ベルト層のベルト幅を広げた構造において、傾斜角度αを75度以上、90度以下の範囲内に規定すると、バットレス部外表面19aと傾斜ベルト層13a,13bのベルト端の距離が近づくことになり、場合によっては、タイヤへの荷重付加時にベルト端部に発生する歪を起因とする、ベルト端部のバットレス部突き抜けが発生する虞がある。
上述した空気タイヤ10について、ドラム試験機を用いて耐久性及び摩耗性の試験を行った。
ここで、従来例、比較例1、比較例2は、バットレス部が凹形状でない、即ち、トレッド端TEとサイドウォール20の境界qを直線状に結ぶ形状を有しており、実施例1から実施例8は、バットレス部が凹形状、即ち、トレッド端TEとサイドウォール20の境界qを凹曲線状に結ぶ形状を有している。
耐久試験は、トレッドセパレーション故障が発生するまでの走行距離を測定し、摩耗試験は、正規荷重下で一定時間ドラム走行させ、トレッドの摩耗量を測定した。
なお、耐久距離は、数字が大きい程、結果が良好であることを示し、摩耗量は、数字が小さい程、結果が良好であることを示す。
11 カーカス
12 ベルト補強層
13a,13b 傾斜ベルト層
14 層間ゴム
15 トレッド
16,17a,17b 周溝
18 トレッドショルダ陸部
19 バットレス部
19a バットレス部外表面
20 サイドウォール
CL タイヤ赤道線
TE トレッド端
Claims (5)
- カーカスのタイヤ径方向外側に配置された少なくとも1層のベルト補強層と、前記ベルト補強層のタイヤ径方向外側に配置された少なくとも1層の傾斜ベルト層と、前記傾斜ベルト層のタイヤ径方向外側に配置されたトレッドの表面にタイヤ幅方向に離間して設置された、複数のタイヤ周方向溝とを具え、
前記ベルト補強層は、タイヤ幅方向断面におけるタイヤ最大幅の70%以上から95%以下のベルト幅を有すると共に、前記ベルト補強層のタイヤ幅方向外側端部が、タイヤ幅方向最外側の前記タイヤ周方向溝よりタイヤ幅方向外側に位置する、空気入りタイヤにおいて、
前記トレッドのタイヤ幅方向外側に位置し前記トレッドの表面をサイドウォールに連続させるバットレス部を、タイヤ幅方向断面で、前記トレッドの表面のタイヤ幅方向外側端からタイヤ幅方向内側へ入り込むことが無い凹形状となる、外表面形状により形成したことを特徴とする空気入りタイヤ。 - 前記バットレス部の外表面形状は、タイヤ幅方向断面で、前記トレッドの表面に対し75度以上、90度以下の傾斜角度を有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。
- 前記傾斜ベルト層の中でベルト幅が最広幅の傾斜ベルト層とバットレス部外表面との最短距離を10mm以上、20mm以下と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。
- 前記トレッドの表面のタイヤ幅方向外側端から前記ベルト補強層のベルト端部までの距離を、0mm以上、25mm以下とすることを特徴とする請求項1から3のいずれか一項に記載の空気入りタイヤ。
- 前記ベルト補強層のベルト端部において、3.0mm以上の層間厚みを有することを特徴とする請求項1から4のいずれか一項に記載の空気入りタイヤ。
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EP12746710.8A EP2676812B1 (en) | 2011-02-14 | 2012-02-10 | Pneumatic tire |
JP2012557822A JP5836286B2 (ja) | 2011-02-14 | 2012-02-10 | 空気入りタイヤ |
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EP (1) | EP2676812B1 (ja) |
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JP2021095088A (ja) * | 2019-12-19 | 2021-06-24 | 株式会社ブリヂストン | タイヤ |
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JP2017506602A (ja) * | 2014-02-27 | 2017-03-09 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | タイヤの改善されたボディプライ形状 |
DE102014218662A1 (de) * | 2014-09-17 | 2016-03-31 | Continental Reifen Deutschland Gmbh | Fahrzeugluftreifen |
FR3045468B1 (fr) * | 2015-12-16 | 2017-12-22 | Michelin & Cie | Pneumatique presentant des proprietes d'usure et de resistance au roulement ameliorees |
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JP6728882B2 (ja) * | 2016-03-30 | 2020-07-22 | 横浜ゴム株式会社 | 空気入りタイヤ |
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JP5836286B2 (ja) | 2015-12-24 |
EP2676812B1 (en) | 2017-08-30 |
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JPWO2012111296A1 (ja) | 2014-07-03 |
EP2676812A4 (en) | 2016-07-13 |
US9630452B2 (en) | 2017-04-25 |
US20130299052A1 (en) | 2013-11-14 |
CN103370211A (zh) | 2013-10-23 |
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