WO2010007924A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2010007924A1 WO2010007924A1 PCT/JP2009/062465 JP2009062465W WO2010007924A1 WO 2010007924 A1 WO2010007924 A1 WO 2010007924A1 JP 2009062465 W JP2009062465 W JP 2009062465W WO 2010007924 A1 WO2010007924 A1 WO 2010007924A1
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- WO
- WIPO (PCT)
- Prior art keywords
- groove
- tire
- block
- wall surface
- sipe
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—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
- B60C11/01—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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
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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
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
-
- 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
- B60C2011/0348—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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0386—Continuous ribs
- B60C2011/0393—Narrow ribs, i.e. having a rib width of less than 8 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
- B60C2011/0386—Continuous ribs
- B60C2011/0393—Narrow ribs, i.e. having a rib width of less than 8 mm
- B60C2011/0395—Narrow ribs, i.e. having a rib width of less than 8 mm for linking shoulder blocks
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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, particularly a pneumatic tire for a passenger car.
- the pneumatic tire in which the groove is arranged as described above has a problem that the edge portion on the lug groove side of the block is turned up due to friction with the road surface on a dry road, and sufficient braking performance cannot be secured.
- the edge on the lug groove side of the block can work effectively to ensure a certain level of braking performance.
- further improvements are also made on braking performance on wet roads. Is required.
- it is required to reduce the rolling resistance of the tire and to ensure the wear resistance of the tire.
- an object of the present invention is to provide a pneumatic tire that reduces rolling resistance and ensures wear resistance while ensuring sufficient braking performance on a dry road and a wet road.
- a plurality of lug grooves defining a block adjacent to the rib, and formed in a surface of the block and extending in the tire circumferential direction from one wall surface on the lug groove side toward the other wall surface.
- the edge portion on the lug groove side of the block tends to be turned up due to friction with the road surface.
- the tread when the tread comes in contact with the ground, the tread compressively deforms and the groove walls of the narrow grooves come into contact with each other, that is, the wall surface of the block and the wall surface of the rib come into contact with each other. , Curling up of the edge part on the lug groove side of the block is suppressed. Thereby, sufficient braking performance is exhibited on the dry road.
- the edge on the lug groove side of the block works effectively during braking and exhibits braking performance.
- the drainage is improved by the first sipe and the second sipe extending in the tire circumferential direction on the surface of the block, sufficient braking performance can be exhibited.
- the second sipe is also opened in the narrow groove, the drainage can be effectively enhanced.
- the first sipe and the second sipe do not intersect with each other in a plan view, that is, the block is not divided along the tire circumferential direction by the first sipe and the second sipe, so that a decrease in rigidity of the block in the tire width direction is suppressed. Reduction in wear resistance of the block is suppressed. Thereby, drainage performance can be improved, ensuring abrasion resistance.
- the block when there is an input in the tire width direction with respect to the tread, the block tries to deform in the tire width direction, but the rib adjacent to the block suppresses deformation in the tire width direction of the block. Heat generation due to internal friction is reduced, and the rolling resistance of the tire can be reduced. Thereby, it becomes possible to contribute to a reduction in fuel consumption of the vehicle.
- the length along the line satisfies 20 to 80% of the length along the tire circumferential direction of the block at the center.
- the pneumatic tire of claim 2 when the length of the shoulder block along the tire circumferential direction satisfies 20 to 80% of the length of the central block along the tire circumferential direction, Since the chance that the edge part on the lug groove side of the central block is turned up due to the friction between the surface of the block and the road surface is reduced, the braking performance can be effectively exhibited. If it exceeds 80%, there are too many opportunities to turn up the edge part on the lug groove side of the central block, and if it is less than 20%, the number of edges on the lug groove side of the central block Therefore, a sufficient edge effect cannot be obtained.
- the pneumatic tire of the present invention can reduce rolling resistance and ensure wear resistance performance while ensuring sufficient braking performance on dry roads and wet roads.
- the tread 12 of the pneumatic tire 10 of the first embodiment is formed with a first circumferential groove 14 extending along the tire circumferential direction on the tire equatorial plane CL.
- a first narrow groove 18 extending along the tire circumferential direction is formed on both outer sides of the first circumferential groove 14 in the tire width direction, and the tire is interposed between the first circumferential groove 14 and the first narrow groove 18.
- Center ribs 16 extending continuously along the circumferential direction are partitioned. Note that the center rib 16 of the present embodiment is a plain rib in which no groove or sipe is formed.
- FIG. This grounding end 12E attaches the pneumatic tire 10 to a standard rim specified in JATMA YEAR® BOOK (2008 edition, Japan Automobile Tire Association Standard), and the maximum load capacity in the applicable size / ply rating in JATMA YEAR BOOK This is the outermost ground contact part in the tire width direction when the maximum load capacity is loaded by filling the internal pressure of 100% of the air pressure (maximum air pressure) corresponding to the (internal pressure-load capacity correspondence table).
- the tread pattern of the pneumatic tire 10 of the present embodiment has a point-symmetric shape with a point on the tire equatorial plane CL as a symmetric point, but the present invention is not limited to this configuration.
- a second circumferential groove 20 extending along the tire circumferential direction is formed on the outer side of the first narrow groove 18 in the tire width direction, and between the first narrow groove 18 and the second circumferential groove 20 in the tire width direction.
- a plurality of center lug grooves 22 which are inclined with respect to each other and connect the first narrow groove 18 and the second circumferential groove 20 are formed at intervals in the tire circumferential direction, and the first narrow groove 18 and the second circumferential direction are formed.
- a plurality of center blocks 24 are partitioned by the groove 20 and the center lug groove 22.
- the first circumferential groove 14, the second circumferential groove 20, and the center lug groove 22 have a groove width that prevents the groove from closing even if the tread 12 is grounded and the ribs and blocks are compressed and deformed. Has been.
- these grooves are set so that the groove depth is deepest in the tread 12 in order to ensure drainage during running on a wet road surface (see FIG. 2).
- the first narrow groove 18 is narrower than the first circumferential groove 14 and the second circumferential groove 20, and when the tread 12 contacts the ground and the center rib 16 and the center block 24 are respectively compressed and deformed,
- the groove width is set so that the wall surface 16A of the center rib 16 which is the groove wall of the one narrow groove 18 and the wall surface 24A of the center block 24 are in contact with each other.
- the first narrow groove 18 of the present embodiment has a substantially constant groove width from the groove bottom to the groove opening portion on the tread surface side.
- the groove width of the first narrow groove 18 is preferably 1.0 mm or less, for example.
- the groove depth of the first narrow groove 18 is set to 50% of the groove depths of the first circumferential groove 14 and the second circumferential groove 20.
- a first sipe 40 extending in the tire circumferential direction from one wall surface 24B on the center lug groove 22 side to the other wall surface 24C is formed on the surface of the center block 24.
- One end of the first sipe 40 opens at the center portion in the tire width direction of the wall surface 24 ⁇ / b> B, and the other end terminates before reaching the center portion in the tire circumferential direction in the center block 24.
- the center block 24 has a surface extending from the other wall surface 24C on the side of the center lug groove 22 toward the one wall surface 24B in the tire circumferential direction, and first before reaching the center portion in the tire circumferential direction in the center block 24.
- a second sipe 42 that is bent (curved) toward the narrow groove 18 is formed. One end of the second sipe 42 opens at the center portion in the tire width direction of the wall surface 24C, and the other end opens at the center portion in the tire circumferential direction of the wall surface 24A on the first narrow groove 18 side.
- the first sipe 40 and the second sipe 42 are formed in the center block 24 so as not to cross each other. That is, the first sipe 40 and the second sipe 42 are formed so that the center block 24 is not divided along the tire circumferential direction. Further, in the present embodiment, the tire sipe extending portion of the second sipe 42 and the first sipe 40 are formed in the center block 24 so as to be in the same straight line shape.
- the depth of the first sipe 40 is preferably set to be the same as or shallower than that of the first narrow groove 18. In the present embodiment, the depth is set to be the same as that of the first narrow groove 18.
- the depth of the second sipe 42 is preferably set to be the same as or shallower than that of the center lug groove 22, and is set to be the same as that of the first sipe 40 in this embodiment.
- the sipe said here means what closes at the time of earthing
- a second narrow groove 28 extending along the tire circumferential direction is formed on the outer side in the tire width direction of the second circumferential groove 20, and the tire circumferential direction is between the second circumferential groove 20 and the second narrow groove 28.
- a shoulder rib 26 extending continuously along the line is defined.
- the shoulder rib 26 is formed with a third sipe 36 shallower than the first circumferential groove 14 and the second circumferential groove 20 at intervals in the tire circumferential direction so as to cross the shoulder rib 26. Yes.
- a plurality of shoulder lug grooves 30 extending from the second narrow groove 28 toward the outer side in the tire width direction are formed at intervals in the tire circumferential direction.
- a plurality of shoulder blocks 32 are defined by 28 and shoulder lug grooves 30.
- the shoulder lug groove 30 is smoothly curved, and when the length along the tire width direction from the ground contact end 12E to the wall surface 32A on the second narrow groove 28 side of the shoulder block 32 is W, the wall surface 32A extends to the tire.
- the lug groove outer portion 30A of the outer portion in the tire width direction on the basis of a straight line HL (broken line in FIG. 1) extending along the tire circumferential direction through a point of 1/3 W outward in the tire width direction along the width direction; It is comprised by the lug groove inner side part 30B of the tire width direction inner side part.
- the lug groove outer portion 30A and the lug groove inner portion 30B have different average angles with respect to the tire width direction, and the average angle of the lug groove outer portion 30A is set to be smaller than the average angle of the lug groove inner portion 30B.
- the angle of the groove with respect to the tire width direction refers to the angle of the center line passing through the center of the groove with respect to the tire width direction.
- a virtual straight line that is inclined at an average angle of the lug groove outer portion 30A with respect to the tire width direction is denoted by reference numeral L1
- a virtual straight line that is inclined at an average angle of the lug groove inner portion 30B relative to the tire width direction Is indicated by a symbol L2.
- the angle difference ⁇ between the virtual straight line L1 and the virtual straight line L2 is preferably set within a range of 10 to 70 degrees.
- the second narrow groove 28 is narrower than the first circumferential groove 14 and the second circumferential groove 20 in the same manner as the first narrow groove 18, and the tread 12 is grounded so that the shoulder rib 26 and the shoulder block 32 are
- the groove width is set so that the wall surface 26 ⁇ / b> A of the shoulder rib 26, which is the groove wall of the second narrow groove 28, and the wall surface 32 ⁇ / b> A of the shoulder block 32 come into contact with each other when compressively deformed.
- the second narrow groove 28 of the present embodiment has a substantially constant groove width from the groove bottom to the groove opening portion on the tread surface side.
- the groove width of the second narrow groove 28 is preferably 1.0 mm or less, for example.
- the groove depth of the second narrow groove 28 is set to 50% of the groove depths of the first circumferential groove 14 and the second circumferential groove 20.
- the circumferential length X2 of the shoulder block 32 along the tire circumferential direction is preferably set within a range of 20 to 80% of the circumferential length X2 of the center block 24 along the tire circumferential direction.
- the circumferential length X2 of the shoulder block 32 is set to 50% of the circumferential length X1 of the center block 24.
- the circumferential direction length of the block in this embodiment has shown the average value of the value which measured the distance from the one wall surface by the side of the lug groove of a block to the other wall surface along a tire circumferential direction.
- the grounding width of the ground from the tire equatorial plane CL toward the outer side in the tire width direction is approximately.
- the second circumferential groove 20 is formed so that the 1/4 position is the center of the groove.
- the inner side in the tire width direction from the center of the second circumferential groove 20 is the center part of the tread 12, and the outer side in the tire width direction including the center is the shoulder part of the tread 12.
- the operation of the pneumatic tire 10 will be described.
- the tread 12 compresses and deforms, and the groove walls of the first narrow grooves 18, that is, the wall surface 16A of the center rib 16 and the wall surface 24A of the center block 24 come into contact with each other.
- the groove walls of the narrow groove 28, that is, the wall surface 26A of the shoulder rib 26 and the wall surface 32A of the shoulder block 32 come into contact with each other.
- the center rib 16 functions to suppress deformation of the center block 24, and the shoulder rib 26 functions to suppress deformation of the shoulder block 32.
- the edge of the center block 24 and the shoulder block 32 on the lug groove side is turned up by friction between the tread 12 and the road surface.
- 16 and the shoulder rib 26 function to suppress deformation of the center block 24 and the shoulder block 32, respectively, and the turn-up of the edge portion on the lug groove side of the block is suppressed. Thereby, sufficient braking performance can be exhibited on the dry road.
- the edge on the lug groove side of the center block 24 and the edge on the lug groove side of the shoulder block 32 work effectively during braking to exhibit braking performance.
- the first sipe 40 and the second sipe 42 extending in the tire circumferential direction on the surface of the block can improve drainage performance when running on a wet road surface, so that sufficient braking performance can be exhibited.
- the second sipe 42 has one end opened in the center lug groove 22 and the other end opened in the first narrow groove 18, the sucked water can be drained into the center lug groove 22 and the first narrow groove 18, The drainage can be improved effectively.
- first sipe 40 and the second sipe 42 do not intersect with each other in a plan view, that is, the center portion of the center block 24 is not divided in the tire circumferential direction by the first sipe 40 and the second sipe 42, so that the tire of the center block 24 A decrease in rigidity in the width direction is suppressed, and a decrease in wear resistance of the center block 24 is suppressed. Thereby, drainage performance can be improved, ensuring abrasion resistance.
- the input of the shoulder block 32 on the outer side in the turning radius direction of the vehicle is the largest, and this shoulder block 32 is on the inner side in the tire width direction (tire
- the shoulder rib 26 adjacent to the inner side in the tire width direction of the shoulder block 32 suppresses the deformation of the shoulder block 32 toward the inner side in the tire width direction. Heat generation due to internal friction is reduced, and rolling resistance can be lowered. Thereby, it becomes possible to contribute to a reduction in fuel consumption of the vehicle.
- the center rib 16 suppresses deformation in the tire width direction, so that the heat generated in the center block 24 can be reduced and the fuel consumption of the vehicle can be reduced. Further, in the pneumatic tire 10 of the present embodiment, even when accelerating (or during rapid acceleration), the edge portion on the lug groove side of the center block 24 and the edge portion on the lug groove side of the shoulder block 32 are suppressed. be able to.
- the friction between the surface of the center block 24 and the road surface causes the lug groove side of the center block 24 to be Since the opportunity for the edge portion to turn up is reduced, the braking performance can be effectively exhibited. If it exceeds 80%, there are too many opportunities to turn up the edge portion of the center block 24 on the lug groove side, and if it is less than 20%, the number of edges on the lug groove side of the center block 24 decreases. Therefore, a sufficient edge effect cannot be obtained. In this embodiment, since the circumferential length X2 of the shoulder block 32 is 50% of the circumferential length X1 of the center block 24, the edge portion on the lug groove side of the center block 24 is turned up. Opportunities to try are effectively reduced.
- the angle difference ⁇ between the imaginary straight line L1 and the imaginary straight line L2 within a range of 10 to 70 degrees, the flow of rubber at the bottom of the shoulder lug groove 30 is suppressed, and the shoulder block 32 is likely to occur. Occurrence of uneven wear such as heel & toe wear is suppressed. Thereby, the abrasion resistance of the shoulder part of the tread 12 is improved, and the life of the pneumatic tire 100 is extended.
- the tire circumferential direction extending portion of the second sipe 42 formed in the center block 24 and the first sipe 40 are formed on the same straight line, but the present invention is limited to this configuration.
- the first sipe 40 and the second sipe 42 may be displaced in the tire width direction, and a plurality of the first sipe 40 may be formed on the center block 24.
- first sipe 40 and the second sipe 42 have the same depth.
- present invention is not limited to this configuration, and the first sipe 40 and the second sipe 42 have the same depth. You may vary the depth.
- the first sipe 40 and the second sipe 42 are formed in the center block 24.
- the present invention is not limited to this configuration, and the first sipe is provided in the shoulder block 32 instead of the center block 24.
- 40 and the second sipe 42 may be formed, and of course, the first sipe 40 and the second sipe 42 may be formed on the center block 24 and the shoulder block 32, respectively.
- the 1st sipe 40 and the 2nd sipe 42 in the shoulder block 32 it comprises so that the other end of the 2nd sipe 42 may open to the wall surface by the side of the 2nd fine groove 28.
- Example pneumatic tire a pneumatic tire having the tread pattern described in the above embodiment.
- Pneumatic tire of a comparative example a pneumatic tire having the tread pattern shown in FIG. In FIG.
- reference numeral 100 is a tread
- reference numerals 102 and 104 are circumferential grooves
- reference numerals 106 and 108 are lug grooves
- reference numerals 110 and 112 are blocks
- reference numeral 114 is a sipe
- circumferential grooves 102 and 104 are implemented. It has substantially the same groove depth and groove width as the circumferential groove in the example.
- each test tire has a tire size of 195 / 65R15, is assembled to a rim with a rim width of 6J-15, mounted on a domestic car sedan, and specified as a vehicle under a load condition in which 600 N is added to the weight of the driver.
- the test was performed with the internal pressure filled.
- the deceleration from 100 km / h was measured with the ABS function being demonstrated.
- the evaluation is represented by an index with the deceleration when the pneumatic tire of the comparative example is mounted as 100, and the larger the index value, the greater the deceleration and the better the braking performance.
- the rolling resistance value was measured with a testing machine when the tire alone was rotated under the same conditions as described above.
- the evaluation is expressed as an index with the reciprocal of the rolling resistance of the pneumatic tire of the comparative example as 100, and the larger the index value, the lower the rolling resistance.
- the wear resistance performance was evaluated by measuring the amount of wear of each block after completion of the braking test and calculating the average value.
- the evaluation is expressed as an index with the reciprocal of the average value of the amount of wear of the pneumatic tire of the comparative example being 100, and the larger the index value, the less the wear, that is, the better the wear resistance.
- the pneumatic tires of the examples to which the present invention was applied showed significantly improved braking performance on the dry road surface and the wet road surface and also greatly reduced the rolling resistance compared to the pneumatic tires of the comparative examples. It was also found that the wear resistance was sufficiently secured.
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- Mechanical Engineering (AREA)
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Abstract
Description
また、第1サイプと第2サイプは平面視で互いに交差しない、つまり第1サイプと第2サイプによってブロックがタイヤ周方向に沿って分断されないため、ブロックのタイヤ幅方向の剛性低下が抑制されてブロックの耐摩耗性の低下が抑制される。これにより、耐摩耗性を確保しつつ、排水性能を高めることができる。
図1に示すように、第1実施形態の空気入りタイヤ10のトレッド12には、タイヤ赤道面CL上にタイヤ周方向に沿って延びる第1周方向溝14が形成されている。この第1周方向溝14のタイヤ幅方向両外側にはタイヤ周方向に沿って延びる第1細溝18が形成されており、第1周方向溝14と第1細溝18との間にタイヤ周方向に沿って連続して延びるセンターリブ16が夫々区画されている。なお、本実施形態のセンターリブ16は、溝やサイプが形成されないプレーンリブとなっている。
なお、ここで言うサイプとは、接地時に閉じて溝幅が零となるものを意味する。
空気入りタイヤ10では、トレッド12が接地した時にトレッド12が圧縮変形して第1細溝18の溝壁同士、つまりセンターリブ16の壁面16Aとセンターブロック24の壁面24Aとが接触し、第2細溝28の溝壁同士、つまりショルダーリブ26の壁面26Aとショルダーブロック32の壁面32Aとが接触する。これにより、センターリブ16がセンターブロック24の変形を抑えるように働き、ショルダーリブ26がショルダーブロック32の変形を抑えるように働く。このため、乾燥路におけるタイヤ周方向の入力時、例えば、制動時に、トレッド12と路面との摩擦によってセンターブロック24及びショルダーブロック32のラグ溝側のエッジ部分がめくれ上がろうとしても、センターリブ16及びショルダーリブ26が夫々センターブロック24及びショルダーブロック32の変形を抑えるように働き、ブロックのラグ溝側のエッジ部分のめくれ上がりが抑えられる。これにより、乾燥路において十分な制動性能を発揮できるようになる。
さらに、ブロック表面のタイヤ周方向に延びる第1サイプ40と第2サイプ42によってウエット路面走行時の排水性が高められるため、十分な制動性能を発揮できるようになる。特に、第2サイプ42は一端がセンターラグ溝22に開口し、他端が第1細溝18に開口しているため、吸引した水をセンターラグ溝22及び第1細溝18に排水でき、効果的に排水性を高めることができる。
また、第1サイプ40と第2サイプ42は平面視で互いに交差しない、つまり第1サイプ40と第2サイプ42によってセンターブロック24の中央部分がタイヤ周方向に分断されないため、センターブロック24のタイヤ幅方向の剛性低下が抑制されてセンターブロック24の耐摩耗性の低下が抑制される。これにより、耐摩耗性を確保しつつ、排水性能を高めることができる。
また、本実施形態の空気入りタイヤ10では、加速時(又は急加速時)においてもセンターブロック24のラグ溝側のエッジ部分、及びショルダーブロック32のラグ溝側のエッジ部分のめくれ上がりを抑制することができる。
第1実施形態では、センターブロック24に形成された第2サイプ42のタイヤ周方向延在部分及び第1サイプ40が同一直線上に形成される構成としているが、本発明はこの構成に限定される必要はなく、第1サイプ40及び第2サイプ42がタイヤ幅方向にずれていてもよく、また第1サイプ40がセンターブロック24に複数本形成される構成としてもよい。
本発明の効果を確かめるために、比較例の空気入りタイヤ、及び本発明の適用された実施例の空気入りタイヤを用意し、各供試タイヤについてウエット路面での制動性能試験、ドライ路面(乾燥路面)での制動性能試験を実施すると共に、転がり抵抗値の測定及び耐摩耗性能の評価を行った。
実施例の空気入りタイヤ:上記実施形態で説明したトレッドパターンを有する空気入りタイヤである。
比較例の空気入りタイヤ:図3に示すトレッドパターンを有する空気入りタイヤである。なお、図3において、符号100はトレッド、符号102、104は周方向溝、符号106、108はラグ溝、符号110、112はブロック、符号114はサイプであり、周方向溝102、104は実施例の周方向溝と略同様の溝深さ、溝幅を有している。
12 トレッド
14 第1周方向溝(周方向溝)
16 センターリブ(リブ)
16A 壁面
18 第1細溝(細溝)
20 第2周方向溝(周方向溝)
22 センターラグ溝
24 センターブロック
24A 壁面
26 ショルダーリブ
26A 壁面
28 第2細溝
30 ショルダーラグ溝
32 ショルダーブロック
32A 壁面
40 第1サイプ
42 第2サイプ
CL タイヤ赤道面
X1 周方向長さ(中央部のブロックの周方向長さ)
X2 周方向長さ(側部のブロックの周方向長さ)
Claims (2)
- トレッドに形成され、タイヤ周方向に延びる複数の周方向溝と、
前記トレッドに形成され、前記周方向溝との間にタイヤ周方向に延びるリブを区画し、前記周方向溝よりも幅が狭く、前記トレッドが接地して圧縮変形した際に溝壁同士が接触する細溝と、
前記トレッドに形成され、前記細溝から前記細溝と交差する方向に延び、前記リブに隣接するブロックを区画する複数のラグ溝と、
前記ブロックの表面に形成され、前記ラグ溝側の一方の壁面から他方の壁面に向かってタイヤ周方向に延び前記ブロック内で終端する第1サイプと、
前記ブロックの表面に形成され、前記ラグ溝側の他方の壁面から一方の壁面に向かってタイヤ周方向に延び、前記一方の壁面と他方の壁面との中間部分で前記細溝側の壁面に向かって曲がり前記細溝側の壁面に開口し、平面視で前記第1サイプと交差しない第2サイプと、
を有する空気入りタイヤ。 - 前記ブロックは、前記トレッドの中央部、及び前記中央部のタイヤ幅方向両外側のショルダー部に夫々区画され、
前記ショルダー部の前記ブロックのタイヤ周方向に沿った長さが、前記中央部の前記ブロックのタイヤ周方向に沿った長さの20~80%を満たす請求項1に記載の空気入りタイヤ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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BRPI0916453A BRPI0916453B1 (pt) | 2008-07-15 | 2009-07-08 | pneumático |
EP09797849.8A EP2311659B1 (en) | 2008-07-15 | 2009-07-08 | Pneumatic tire |
KR1020117001972A KR101259261B1 (ko) | 2008-07-15 | 2009-07-08 | 공기 타이어 |
US13/004,000 US8881780B2 (en) | 2008-07-15 | 2009-07-08 | Pneumatic tire |
CN200980127480.5A CN102089162B (zh) | 2008-07-15 | 2009-07-08 | 充气轮胎 |
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JP2008-183931 | 2008-07-15 | ||
JP2008183931A JP5314343B2 (ja) | 2008-07-15 | 2008-07-15 | 空気入りタイヤ |
Publications (1)
Publication Number | Publication Date |
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WO2010007924A1 true WO2010007924A1 (ja) | 2010-01-21 |
Family
ID=41550327
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PCT/JP2009/062465 WO2010007924A1 (ja) | 2008-07-15 | 2009-07-08 | 空気入りタイヤ |
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US (1) | US8881780B2 (ja) |
EP (1) | EP2311659B1 (ja) |
JP (1) | JP5314343B2 (ja) |
KR (1) | KR101259261B1 (ja) |
CN (1) | CN102089162B (ja) |
BR (1) | BRPI0916453B1 (ja) |
WO (1) | WO2010007924A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120168050A1 (en) * | 2010-12-29 | 2012-07-05 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
CN102673318A (zh) * | 2011-03-08 | 2012-09-19 | 住友橡胶工业株式会社 | 充气轮胎 |
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JP5930586B2 (ja) * | 2011-02-21 | 2016-06-08 | 株式会社ブリヂストン | 空気入りタイヤ |
JP5698622B2 (ja) * | 2011-08-04 | 2015-04-08 | 株式会社ブリヂストン | タイヤ |
JP6092534B2 (ja) * | 2012-06-29 | 2017-03-08 | 株式会社ブリヂストン | 空気入りタイヤ |
JP5803859B2 (ja) * | 2012-09-06 | 2015-11-04 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP6109693B2 (ja) * | 2013-09-26 | 2017-04-05 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
JP6010576B2 (ja) * | 2014-04-14 | 2016-10-19 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP6348013B2 (ja) * | 2014-07-30 | 2018-06-27 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
JP6164235B2 (ja) * | 2015-02-16 | 2017-07-19 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP6393208B2 (ja) * | 2015-02-16 | 2018-09-19 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP1545835S (ja) * | 2015-09-15 | 2016-03-14 | ||
JP6612585B2 (ja) * | 2015-10-30 | 2019-11-27 | Toyo Tire株式会社 | 空気入りタイヤ |
JP6092984B2 (ja) * | 2015-10-30 | 2017-03-08 | 株式会社ブリヂストン | 空気入りタイヤ |
JP6292264B2 (ja) * | 2016-08-01 | 2018-03-14 | 横浜ゴム株式会社 | 空気入りタイヤ |
CN108274958A (zh) * | 2018-02-09 | 2018-07-13 | 建大橡胶(中国)有限公司 | 一种高尔夫球车轮胎 |
JP7035740B2 (ja) * | 2018-04-06 | 2022-03-15 | 住友ゴム工業株式会社 | タイヤ |
CN112996672B (zh) * | 2018-11-16 | 2022-12-23 | 米其林集团总公司 | 具有胎肩花纹条刀槽花纹布置的重型卡车轮胎 |
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- 2009-07-08 CN CN200980127480.5A patent/CN102089162B/zh not_active Expired - Fee Related
- 2009-07-08 WO PCT/JP2009/062465 patent/WO2010007924A1/ja active Application Filing
- 2009-07-08 KR KR1020117001972A patent/KR101259261B1/ko active IP Right Grant
- 2009-07-08 US US13/004,000 patent/US8881780B2/en not_active Expired - Fee Related
- 2009-07-08 EP EP09797849.8A patent/EP2311659B1/en not_active Not-in-force
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US20120168050A1 (en) * | 2010-12-29 | 2012-07-05 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US9139047B2 (en) * | 2010-12-29 | 2015-09-22 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
CN102673318A (zh) * | 2011-03-08 | 2012-09-19 | 住友橡胶工业株式会社 | 充气轮胎 |
CN102673318B (zh) * | 2011-03-08 | 2015-09-23 | 住友橡胶工业株式会社 | 充气轮胎 |
Also Published As
Publication number | Publication date |
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KR20110022716A (ko) | 2011-03-07 |
US20110120609A1 (en) | 2011-05-26 |
US8881780B2 (en) | 2014-11-11 |
CN102089162B (zh) | 2014-01-08 |
KR101259261B1 (ko) | 2013-04-29 |
CN102089162A (zh) | 2011-06-08 |
EP2311659A4 (en) | 2014-01-15 |
JP5314343B2 (ja) | 2013-10-16 |
EP2311659A1 (en) | 2011-04-20 |
EP2311659B1 (en) | 2016-08-31 |
JP2010023549A (ja) | 2010-02-04 |
BRPI0916453B1 (pt) | 2020-02-04 |
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