WO2010021288A1 - タイヤ - Google Patents
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- Publication number
- WO2010021288A1 WO2010021288A1 PCT/JP2009/064272 JP2009064272W WO2010021288A1 WO 2010021288 A1 WO2010021288 A1 WO 2010021288A1 JP 2009064272 W JP2009064272 W JP 2009064272W WO 2010021288 A1 WO2010021288 A1 WO 2010021288A1
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- WIPO (PCT)
- Prior art keywords
- tire
- block land
- groove
- adjacent
- circumferential direction
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0344—Circumferential grooves provided at the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0346—Circumferential grooves with zigzag shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0348—Narrow grooves, i.e. having a width of less than 4 mm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
Definitions
- a plurality of tire circumferential grooves extending in the tire circumferential direction and a plurality of lateral grooves communicating with two adjacent tire circumferential grooves are arranged in the tread portion.
- the present invention relates to a tire, in particular, a heavy load tire, in which a plurality of block land portion rows made up of individual block land portions are formed, and the wear resistance of the tire is improved.
- the load load is higher than that of a general vehicle tire, and therefore, uneven wear due to heel and toe wear tends to occur during traveling in proportion to the load applied.
- Heel and toe wear is caused by excessive deformation of the block land during rolling of the tire load, and the amount of wear at the stepping end (the part that makes contact with the ground first) is reduced, and the tire end in the tire circumferential direction (the last is the grounding) (Part to be) means wear that increases the amount of wear. Therefore, there is a problem that a difference in wear occurs mainly at both ends of the block land portion in the tire circumferential direction, and the wear life of the tire is shortened.
- Patent Document 1 a part of the lateral groove that defines the block is made shallow, that is, a bottom raised portion is provided in the lateral groove, so that the block land portion collapses in the tire circumferential direction. It is considered to be effective to increase the stress against the above, suppress an increase in the driving force load per unit area, and prevent uneven wear due to the falling deformation.
- Heavy load tires mounted on trucks and buses have a high flatness ratio and high belt rigidity, so that when the tire is rolling, the belt rotates due to the driving force being applied, and the road surface is grounded. Due to the friction of the tread portion, a difference in displacement occurs between the belt portion and the tread portion, as shown in FIG. 1, and the tread portion falls over and deforms. As a result, since the driving force burden per unit area of the tread portion increases, a slip phenomenon occurs on the road surface of the block land portion, and the wear amount of the block land portion increases due to the slip phenomenon.
- Patent Document 1 Although there is a certain effect in preventing uneven wear, it is not possible to sufficiently suppress the collapse deformation of the block land portion at the time of tire load rolling, so the block caused by the slip phenomenon The increase in the amount of wear on the land could not be suppressed, and a problem remained in terms of wear resistance. Also, in general, it is possible to effectively suppress the amount of wear of the block land portion by increasing the rigidity of the rubber constituting the block land portion and suppressing excessive falling deformation of the block land portion. Further, the rigidity of the block land portion becomes too high, and there is a possibility that the block land portion may be broken due to baldness or cracks when rolling the tire.
- FIG. 1 A tire formed by partitioning a plurality of block land portion rows composed of a plurality of block land portions by arranging a circumferential groove and a plurality of transverse grooves communicating with two adjacent circumferential grooves,
- the block land portions constituting the block land portion rows adjacent to each other across the circumferential groove are arranged to be shifted from each other in the tire circumferential direction, and the groove portion between the block land portions adjacent to each other in the tire width direction.
- the extending direction of is inclined with respect to the tire width direction and the tire circumferential direction, and the distance between the block land portions adjacent in the tire width direction is shorter than the distance between the block land portions adjacent in the tire circumferential direction,
- the length of the tire width direction cross-section of the locking land portion has proposed a tire comprising an increased toward the center portion of the block land portion from the tire circumferential ends of the block land portion.
- FIG. 3 shows the driving force of the circumferential shear force (the driving force acting on the tire contact surface) from the time of stepping to the time of kicking out at any position of the block land portion in contact with the road surface when driving force is applied. The change from no load is shown.
- the circumferential shear force hardly changes when the driving force is not applied when the pedal is depressed, and then monotonously increases when the tire is kicked.
- the next block land portion is caused by the reaction of lifting due to the increase in shear deformation of the block land portion that has already been stepped on, which occurs when driving force is applied. It has been found that by increasing the deformation that is pressed against the road surface side, the force at the time of depression can be efficiently generated and the characteristics shown by the broken line in FIG. 3 can be exhibited. It has also been found that this phenomenon can be effectively exerted by reducing the tire circumferential distance between the block land portions, but when the tire circumferential distance between the block land portions is made closer, as shown in FIG.
- the configuration of the present invention was found.
- the block land portions constituting them are arranged to be shifted from each other in the tire circumferential direction, and adjacent to the tire width direction.
- the extending direction of the groove portion between the block land portions is inclined with respect to the tire width direction and the tire circumferential direction, and the distance between the block land portions adjacent in the tire width direction is larger than the distance between the block land portions adjacent in the tire circumferential direction. Since the distance is short, the groove portion between the block land portions adjacent to each other in the tire width direction is formed while the rubber bulging component (FIG. 5) due to contact between the block land portions adjacent to each other in the tire peripheral direction is suppressed.
- the distance between the block land portions is short and the distance between the block land portions is short, it is possible to efficiently generate a driving force load when the vehicle is depressed. Thereby, the gradient of the circumferential shear force from the time of stepping on to the time of kicking is reduced, and sliding wear can be suppressed.
- the inventor conducted earnest research on the wear of the block land portion when a tire having a block land portion, particularly a heavy duty tire having a high flatness ratio, was used as a drive wheel, and as a result, the following knowledge was obtained. . That is, if the block land portion is pressed horizontally against the road surface and brought into contact with the ground, the stress caused by the incompressibility of the rubber is applied to the stepping end and the kicking end of the block land portion as shown in FIG. Although concentrated, when tread wear occurs due to slippage of the tread, the tread is pressed obliquely against the road surface by the belt, so the stress caused by the incompressibility of the rubber is shown in FIG. As shown, it is loaded at the center of the block land.
- the tread part is pressed more strongly against the road surface, so the stress caused by the incompressibility of the rubber is greatly applied to the central part of the block land part. It becomes.
- the force generated along with the compression deformation is loaded in the same direction as the traveling direction of the vehicle and promoted by the driving force of the engine torque, leading to an increase in sliding wear. Therefore, as described above, by increasing the length of the cross section of the block land portion in the tire width direction from both ends in the tire circumferential direction of the block land portion to the center portion of the block land portion, the block land portion is in relation to the road surface.
- the compressive stress concentrates in the central area of the block land as shown in FIG.
- the latter block land portion When compared with the deformation (dotted line) when the load is applied to the latter, the latter block land portion suppresses the deformation of the rubber toward the block kicking end side by the same mechanism as when kicking, but the rubber Due to the incompressibility, the deformation restrained acts in the direction of increasing the lift of the kicking end of the block land portion that has already been stepped on. As a result, since the shear deformation of the block land portion to be stepped on next increases, the shear force during stepping increases as shown in FIG. The effect of becoming synergistically obtained. As a result, excessive deformation of the block land portion is suppressed, and uneven wear and sliding wear of the block land portion can be effectively prevented.
- an object of the present invention is to optimize the shape of the block land portion and the arrangement position thereof. Another object of the present invention is to provide a tire with further improved wear resistance.
- the present invention provides a tread portion with a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lateral grooves communicating with two adjacent circumferential grooves.
- a tire formed by partitioning a plurality of block land portions composed of a plurality of block land portions, and at least two block land portion rows adjacent to each other across the circumferential groove, adjacent block land constituting them Are spaced from each other in the tire circumferential direction, and the distance between the block land portions adjacent to each other in the tire width direction is shorter than the distance between the block land portions adjacent to each other in the tire circumferential direction.
- the extending direction of the groove portion between the block land portions is inclined with respect to the tire width direction and the tire circumferential direction, and a plurality of adjacent block land portion rows are arranged across the circumferential groove.
- the inclination angle with respect to the tire circumferential direction in the extending direction of the groove portion between the block land portions adjacent to the tire width direction of the block land portion row closest to the tire equatorial plane side is the tire width. It is a tire characterized by being larger than the inclination angle with respect to the tire circumferential direction in the extending direction of the groove portion between the block land portions adjacent to each other in the tire width direction of the block land portion row arranged on the outermost side in the direction.
- the “groove portion” is a part of the circumferential groove, which means a groove extending between the block land portions adjacent in the tire width direction, and “displaced” means the tire width.
- the arrangement is such that the circumferential edge of the block land portion does not coincide between the block land portions adjacent to each other in the tire width direction by changing the starting point of the arrangement pitch in the tire circumferential direction of the block land portion adjacent in the direction.
- the inclination angle of the groove portion between the block land portions adjacent in the tire width direction with respect to the tire circumferential direction is on the tire equatorial plane side. It is preferable that the groove is larger.
- the cross-sectional length of the block land portion in the tire width direction increases from both ends of the block land portion in the tire circumferential direction to the center portion of the block land portion.
- the “center portion of the block land portion” refers to a region extending from the center position in the tire circumferential direction of the block land portion to both ends of the block land portion and in a range of 5 to 30% of the tire circumferential direction length of the block land portion. Shall. That is, the area excluding 20% from the circumferential end of the block land portion.
- the inclination angle with respect to the tire circumferential direction of the groove portion closest to the tire equator plane among the groove portions between the block land portions adjacent in the tire width direction is in a range of 15 to 70 °.
- the inclination angle of the groove portion on the shoulder side with respect to the tire circumferential direction is preferably 20 ° or less.
- the ratio of the distance between block land portions adjacent in the tire width direction to the distance between block land portions adjacent in the tire circumferential direction is preferably in the range of 1: 0.85 to 1: 0.3.
- the ratio of the distance between the block land portions adjacent in the tire circumferential direction to the length of the block land portion in the tire circumferential direction is preferably in the range of 1: 0.25 to 1: 0.05.
- the distance between the block land portions adjacent in the tire width direction is preferably 1.0 to 5.0 mm.
- the distance between the block land portions adjacent to each other in the tire circumferential direction is preferably 3.0 to 10.0 mm.
- a narrow groove that communicates two circumferential grooves adjacent to the block land portion in the tire width direction is disposed in the block land portion.
- the narrow groove is preferably open to the circumferential groove at the center of the block land.
- the length of the narrow groove in the tire circumferential direction is preferably in the range of 5 to 20% of the groove depth of the lateral groove.
- FIG. 1 is a development view of a part of a tread portion of a typical tire according to the present invention.
- FIG. 6 is a development view of a part of a tread portion of another tire according to the present invention.
- FIG. 6 is a development view of a part of a tread portion of another tire according to the present invention.
- FIG. 9 is a development view of a part of a tread portion of a typical tire according to the present invention.
- 10 and 11 are development views of a part of the tread portion of another tire according to the present invention.
- the tire according to the present invention has a plurality of circumferential grooves 2 extending in the tire circumferential direction X and a plurality of lateral grooves 3 communicating with two adjacent circumferential grooves 2 in the tread portion 1.
- the block land portion row 5 composed of a large number of block land portions 4 is sectioned. Further, the distance d 2 between the block land portions adjacent in the tire width direction is shorter than the distance d 1 between the block land portions adjacent in the tire circumferential direction. Further, the cross-sectional length of the block land portion 4 in the tire width direction increases from both end portions 6 and 6 in the tire circumferential direction of the block land portion 4 to the central portion 7 of the block land portion 4.
- the extending direction Y of the groove 8 between the block land portions adjacent to each other in the tire width direction is inclined with respect to the tire width direction and the tire circumferential direction X, and the tire in the extending direction Y of the groove 8 is provided.
- the inclination angle ⁇ with respect to the circumferential direction X is the tire equator plane CL most than the groove portion 8A between the block land portions adjacent in the tire width direction of the block land portion row 5 located on the outermost side in the tire width direction, that is, on the most shoulder side. It is large in the groove portion 8B between the block land portions adjacent to each other in the tire width direction of the block land portion row 5 located on the side.
- the block land adjacent in the tire width direction is suppressed while suppressing the rubber bulging component (FIG. 5) due to the contact between the block land portions 4 adjacent in the tire circumferential direction.
- the groove portion 8 between the portions is inclined in the tire circumferential direction and the tire width direction, and the length of the cross section of the block land portion 4 in the tire width direction is changed from the tire circumferential direction both ends 6 and 6 of the block land portion 4 to the block land portion 4. Utilizing the fact that it increases toward the central portion 7 and the distance between the block land portions is short, as shown in FIG. 8, the driving force burden at the time of depression is efficiently generated by the reaction between the block land portions 4 Can do.
- the block land portions 4 adjacent in the tire width direction are arranged with a half pitch shift in the tire circumferential direction. Because the block land portion 4 is arranged with a half-pitch shift, the deformation force that collapses and deforms at the time of tire load rolling can be effectively transmitted to the block land portion 4 adjacent in the tire width direction. This is because it is possible to reduce the driving force burden per unit area of the tread portion 1 and prevent wear due to the slip phenomenon on the road surface of the block land portion 4. In this way, the gradient of the tire circumferential direction shear force from stepping on to kicking out becomes small, and the shearing force at the time of kicking in which sliding wear occurs becomes small, so that sliding wear is reduced.
- the groove depth of the groove portion 8 between the block land portions adjacent in the tire width direction is the circumferential groove. It is preferably in the range of 60 to 100% of the groove depth of 2A. Further, the ratio of the tire width direction length B of the central portion 7 of the block land portion 4 to the tire width direction length A of the tire circumferential direction end portion 6 of the block land portion 4 is 1: 3 to 1: 1.5. It is preferable that it exists in the range.
- the block land portion row in which the inclination angle ⁇ of the extending direction Y of the groove portion 8 between the block land portions adjacent in the tire width direction with respect to the tire circumferential direction X is located on the most shoulder side.
- the angle ⁇ 1 formed by X is larger.
- the inclination angle ⁇ of the extending direction Y of the groove 8 between the block land portions adjacent in the tire width direction with respect to the tire circumferential direction X is larger as the groove 8 on the tire equatorial plane CL side. It is preferable. As the inclination angle ⁇ of the groove 8 is larger, the effect of suppressing the sliding wear due to the above-described configuration is increased, and the wear resistance is improved.
- the inventor found that the land portion on the tire equatorial plane side of the tread portion 1 is heavily loaded with the driving force and wears earlier than the land portion on the shoulder side. This is especially true for heavy-duty tires that are mounted on a drive shaft to which torque from the engine is transmitted and have a large load).
- the block land portion 4 is loaded so much that it is closer to the tire equatorial plane CL.
- the period until the tire is discarded may be shortened, and the tire life may be shortened. Therefore, as described above, the inclination angle ⁇ of the groove 8 between the block land portions adjacent in the tire width direction of the block land portion row 5 on the tire equatorial plane CL side is set to the block land portion row 5 on the shoulder side.
- the wear rate between the block land portion on the tire equatorial plane side and the shoulder side is reduced by suppressing the wear on the block land portion 4 on the tire equatorial plane CL side more than that on the shoulder side.
- the tread portion 1 can be uniformly worn as a whole, and the tire life can be extended.
- the inclination angle ⁇ with respect to the tire circumferential direction of the groove portion 8B closest to the tire equatorial plane side. ( ⁇ 1 in the illustrated example) is preferably in the range of 15 to 70 °.
- the inclination angle ⁇ ( ⁇ 2 in the illustrated example) of the groove portion 8A on the most shoulder side with respect to the tire circumferential direction is preferably 20 ° or less.
- the groove portion 8 between the block land portions adjacent to each other in the tire width direction is opposite to the tire equatorial plane when viewed in the tire circumferential direction.
- the opening angle is preferably in the direction of. Because, when the extending direction of the groove 8 between the block land portions adjacent to each other in the tire width direction is the same, it is possible to effectively cope with an input from a certain direction and prevent sliding wear. This is because there is a possibility that sliding wear cannot be prevented without effectively dealing with input from other directions.
- the block land part 4 which arises by making it the shape which increases the inclination of the groove part extension direction between the block land parts adjacent to a tire width direction, and the tire width direction cross-sectional length of the center part 7 of the block land part 4 is made.
- the block pattern can be formed without generating useless space in the tire width direction, and the wear resistance performance can be effectively exhibited without impairing the configuration and operation of both. Therefore, pattern design by combination with second ribs, shoulder ribs, lugs and the like is facilitated.
- the tire circumferential length d 3 of the block land portion 4 is in the range of 1.0 to 2.5% of the tire circumferential length. If the tire circumferential direction length d 3 of the block land portion 4 exceeds 2.5% of the circumferential length of the tire, increase the block shear rigidity excessively, as described above, lifting of the block land portion 4 was finished already depression is It may not be obtained sufficiently.
- the tire circumferential direction length d 3 of the block land portion 4 is not more than 2.5% of the tire circumferential length, if it is less than 1.0 percent, the rigidity of the block land portion 4 excessively decreases When the driving force is applied to the block land portion 4, the block land portion 4 undergoes excessive shear deformation, and the sliding wear cannot be sufficiently suppressed. Therefore, by setting the tire circumferential direction length d 3 of the block land portion 4 in the range of 1.0 to 2.5% of the tire circumferential length, the rigidity of the block land portion 4 is ensured and the above-mentioned block land portion 4 is secured. Since the effect of the portion 4 is effectively exhibited, there is a possibility that the wear resistance can be sufficiently reduced.
- the ratio of the distance d 2 between the block land portions adjacent in the tire width direction to the distance d 1 between the block land portions adjacent in the tire circumferential direction may be in the range of 1: 0.85 to 1: 0.3. Preferably, it is in the range of 1: 0.7 to 1: 0.4.
- the ratio of the distance d 2 between the block land portions adjacent in the tire width direction to the distance d 1 between the block land portions adjacent in the tire circumferential direction is larger than 1: 0.3, the block adjacent in the tire circumferential direction even enough that the land portion distance d 1, is too short distance d 2 between the block land portions adjacent in the tire width direction.
- the block land portions 4 adjacent to each other in the tire width direction come into contact with each other during tire load rolling, and the deformation force that collapses and deforms is not effectively transmitted to the block land portions 4 adjacent to the tire width direction.
- the shearing force in the land portion 4 is not effectively dispersed and sliding wear is caused.
- the ratio of the distance d 2 between the block land portions adjacent in the tire width direction is 1: is smaller than 0.85, adjacent in the tire width direction even enough that distance d 2 between the block land portions is, becomes too short distance d 1 between the block land portions adjacent in the tire circumferential direction. Therefore, when the block land portion 4 comes in contact with the road surface, the block land portions 4 come into contact with each other in the tire circumferential direction, and deformation due to the swelling of the rubber shown in FIG. there's a possibility that.
- the ratio of the distance d 1 between the block land portions adjacent in the tire circumferential direction to the tire circumferential direction length d 3 of the block land portion 4 may be in the range of 1: 0.25 to 1: 0.05. More preferably, it is in the range of 1: 0.17 to 1: 0.07.
- the tire circumferential ratio of distance d 1 between the block land portions adjacent in the direction is 1: greater than 0.05, the block land portion when the tire is rolling under load When 4 falls and deforms, the block land portion 4 adjacent in the tire circumferential direction gets too close. Therefore, as shown in FIG.
- the ratio of the distance d 1 between the block land portions adjacent in the tire circumferential direction is 1: smaller than 0.25 is adjacent in the tire circumferential direction Since the block land portion 4 is too far away, the shear force of the block land portion 4 adjacent to the tire circumferential direction cannot be distributed in a balanced manner using the shear force of the kicking end 9 of the block land portion 4. Again, there is a possibility of causing sliding wear.
- the tire circumferential length of the narrow groove 11 is preferably in the range of 5 to 20%, more preferably in the range of 7 to 18% of the groove depth (diameter depth) of the lateral groove 3. is there.
- the tire circumferential direction length of the narrow groove 11 is less than 5% of the groove depth of the lateral groove 3, the tire circumferential direction length of the narrow groove 11 becomes too short.
- the grip force decreases from the stepping end 10 toward the kicking end 9, and the effect of disposing the narrow groove 11 may be lost. There is sex.
- a pneumatic tire (comparative example tire) in which all the configurations are similar to the tire of the present invention except that the inclination angles ⁇ of the groove portions between the block land portions adjacent in the tire width direction are all the same.
- a pneumatic tire (Example tire) according to the present invention was prototyped and evaluated as a heavy duty pneumatic tire having a tire size of 445 / 50R22.5, and will be described below.
- each of the comparative example tire and the example tire includes a tread portion having a configuration illustrated in FIGS.
- the comparative example tire has a block land portion row in the tread portion, and among the block land portion rows, in the two block land portion rows near the tire equator plane, the tire width direction
- the extending direction of the groove portion between the block land portions adjacent to each other is inclined with respect to the tire width direction and the tire circumferential direction, and is adjacent to the tire width direction rather than the distance between the block land portions adjacent to the tire circumferential direction.
- the distance between the block land portions is shortened, and the length of the cross section of the block land portion in the tire width direction increases from both ends of the block land portion in the tire circumferential direction to the center portion of the block land portion.
- Inclination angles ⁇ of the groove extending direction between adjacent block land portions with respect to the tire circumferential direction are all 20 °.
- the example tire has a block land portion row in the tread portion, and among the block land portion rows, in the two block land portion rows near the tire equator plane, the tire circumferential direction
- the distance between the block land portions adjacent to each other in the tire width direction is shorter than the distance between the block land portions adjacent to each other.
- To the center of the block land portion, and the extending direction of the groove between the block land portions adjacent to each other in the tire width direction is inclined with respect to the tire width direction and the tire circumferential direction.
- the tire of the example has a center portion of the block land portion of the block land portion row on the tire equatorial plane side and a shoulder as compared with the comparative tire.
- the difference in wear amount between the block land portion row on the side and the center portion of the block land portion was small, and the average wear amount was also small.
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- Mechanical Engineering (AREA)
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Abstract
Description
2、2A 周方向溝
3 横溝
4 ブロック陸部
5 ブロック陸部列
6 ブロック陸部のタイヤ周方向端部
7 ブロック陸部の中央部
8、8A、8B タイヤ幅方向に隣接しているブロック陸部間の溝部
9 蹴出端
10 踏込端
11 細溝
Claims (12)
- トレッド部に、タイヤ周方向に延びる複数本の周方向溝と、隣接する2本の周方向溝を連通する複数本の横溝を配設することによって、多数個のブロック陸部からなる複数のブロック陸部列を区画形成したタイヤであって、
該周方向溝を挟んで隣接する少なくとも2列のブロック陸部列において、それらを構成する前記隣接するブロック陸部がタイヤ周方向に互いにずらして配設されており、タイヤ周方向に隣接するブロック陸部間距離よりも、タイヤ幅方向に隣接するブロック陸部間距離が短く、タイヤ幅方向に隣接しているブロック陸部間の溝部の延在方向がタイヤ幅方向及びタイヤ周方向に対し傾斜しており、
前記周方向溝を挟んで隣接する少なくとも2列のブロック陸部列が複数配置され、
前記ブロック陸部列のうち、タイヤ赤道面側に最も近い前記ブロック陸部列のタイヤ幅方向に隣接しているブロック陸部間の溝部の延在方向のタイヤ周方向に対する傾斜角度が、タイヤ幅方向最も外側に配置される前記ブロック陸部列のタイヤ幅方向に隣接しているブロック陸部間の溝部の延在方向のタイヤ周方向に対する傾斜角度よりも大きいことを特徴とするタイヤ。 - 前記周方向溝を挟んで隣接するブロック陸部列において、タイヤ幅方向に隣接しているブロック陸部間の溝部の延在方向のタイヤ周方向に対する傾斜角度は、タイヤ赤道面側にある該溝部程大きい、請求項1に記載のタイヤ。
- 前記ブロック陸部のタイヤ幅方向断面長さが、該ブロック陸部のタイヤ周方向両端部から該ブロック陸部の中央部にかけて増大してなる、請求項1又は2に記載のタイヤ。
- 前記タイヤ幅方向に隣接しているブロック陸部間の溝部のうち、最もタイヤ赤道面側にある溝部のタイヤ周方向に対する傾斜角度は、15~70°の範囲にある、請求項1~3のいずれか一項に記載のタイヤ。
- 前記タイヤ幅方向に隣接しているブロック陸部間の溝部のうち、最もショルダー側にある溝部のタイヤ周方向に対する傾斜角度は、20°以下である、請求項1~4のいずれか一項に記載のタイヤ。
- 前記タイヤ周方向に隣接するブロック陸部間距離に対する、前記タイヤ幅方向に隣接するブロック陸部間距離の比は1:0.85~1:0.3の範囲にある、請求項1~5のいずれか一項に記載のタイヤ。
- 前記ブロック陸部のタイヤ周方向長さに対する、前記タイヤ周方向に隣接するブロック陸部間距離の比は1:0.25~1:0.05の範囲にある、請求項1~6のいずれか一項に記載のタイヤ。
- 前記タイヤ幅方向に隣接するブロック陸部間距離は1.0~5.0mmである、請求項1~7のいずれか一項に記載のタイヤ。
- 前記タイヤ周方向に隣接するブロック陸部間距離は3.0~10.0mmである、請求項1~8のいずれか一項に記載のタイヤ。
- 前記ブロック陸部に、該ブロック陸部に隣接する2本の周方向溝をタイヤ幅方向に連通する細溝を配設してなる、請求項1~9のいずれか一項に記載のタイヤ。
- 前記細溝は、ブロック陸部の中央部で周方向溝に開口している、請求項10に記載のタイヤ。
- 前記細溝のタイヤ周方向長さは、前記横溝の溝深さの5~20%の範囲内にある、請求項10又は11に記載のタイヤ。
Priority Applications (4)
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CN2009801421698A CN102196927B (zh) | 2008-08-22 | 2009-08-12 | 轮胎 |
EP09808224.1A EP2319713B1 (en) | 2008-08-22 | 2009-08-12 | Tire |
JP2010525676A JP5291107B2 (ja) | 2008-08-22 | 2009-08-12 | タイヤ |
US13/058,953 US9186936B2 (en) | 2008-08-22 | 2009-08-12 | Tire |
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JP2008-213645 | 2008-08-22 | ||
JP2008213645 | 2008-08-22 |
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WO2010021288A1 true WO2010021288A1 (ja) | 2010-02-25 |
Family
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2009/064272 WO2010021288A1 (ja) | 2008-08-22 | 2009-08-12 | タイヤ |
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US (1) | US9186936B2 (ja) |
EP (1) | EP2319713B1 (ja) |
JP (1) | JP5291107B2 (ja) |
CN (1) | CN102196927B (ja) |
WO (1) | WO2010021288A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011194946A (ja) * | 2010-03-17 | 2011-10-06 | Bridgestone Corp | 空気入りタイヤ |
JP2012016991A (ja) * | 2010-07-07 | 2012-01-26 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
JP2012051504A (ja) * | 2010-09-02 | 2012-03-15 | Bridgestone Corp | 空気入りタイヤ |
JP2012076658A (ja) * | 2010-10-04 | 2012-04-19 | Bridgestone Corp | 空気入りタイヤ |
WO2014119336A1 (ja) * | 2013-02-01 | 2014-08-07 | 株式会社ブリヂストン | 空気入りタイヤ |
JP2015000700A (ja) * | 2013-06-18 | 2015-01-05 | 株式会社ブリヂストン | タイヤ |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6012298B2 (ja) | 2012-07-05 | 2016-10-25 | 株式会社ブリヂストン | 空気入りタイヤ |
JP6925227B2 (ja) * | 2017-10-16 | 2021-08-25 | 株式会社ブリヂストン | タイヤ |
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- 2009-08-12 CN CN2009801421698A patent/CN102196927B/zh not_active Expired - Fee Related
- 2009-08-12 US US13/058,953 patent/US9186936B2/en not_active Expired - Fee Related
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JP2011194946A (ja) * | 2010-03-17 | 2011-10-06 | Bridgestone Corp | 空気入りタイヤ |
JP2012016991A (ja) * | 2010-07-07 | 2012-01-26 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
JP2012051504A (ja) * | 2010-09-02 | 2012-03-15 | Bridgestone Corp | 空気入りタイヤ |
JP2012076658A (ja) * | 2010-10-04 | 2012-04-19 | Bridgestone Corp | 空気入りタイヤ |
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Also Published As
Publication number | Publication date |
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CN102196927B (zh) | 2013-12-18 |
JPWO2010021288A1 (ja) | 2012-01-26 |
US20110139324A1 (en) | 2011-06-16 |
EP2319713B1 (en) | 2013-10-02 |
JP5291107B2 (ja) | 2013-09-18 |
CN102196927A (zh) | 2011-09-21 |
US9186936B2 (en) | 2015-11-17 |
EP2319713A4 (en) | 2011-09-14 |
EP2319713A1 (en) | 2011-05-11 |
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