WO2014128966A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2014128966A1 WO2014128966A1 PCT/JP2013/054766 JP2013054766W WO2014128966A1 WO 2014128966 A1 WO2014128966 A1 WO 2014128966A1 JP 2013054766 W JP2013054766 W JP 2013054766W WO 2014128966 A1 WO2014128966 A1 WO 2014128966A1
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- WIPO (PCT)
- Prior art keywords
- tire
- groove
- area
- pneumatic tire
- pneumatic
- Prior art date
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Classifications
-
- 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
- B60C11/0304—Asymmetric patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0327—Tread patterns characterised by special properties of the tread pattern
- B60C11/033—Tread patterns characterised by special properties of the tread pattern by the void or net-to-gross ratios of the patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0327—Tread patterns characterised by special properties of the tread pattern
- B60C11/0332—Tread patterns characterised by special properties of the tread pattern by the footprint-ground contacting area of the tyre tread
-
- 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
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
-
- 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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
Definitions
- the present invention relates to a pneumatic tire with improved fuel economy for passenger cars.
- an object of the present invention is to provide a pneumatic tire capable of improving the steering stability performance deteriorated thereby while reducing the rolling resistance.
- a pneumatic tire in which an asymmetric pattern formed by grooves in the tread portion is formed SW / OD, which is the ratio of the total width SW of the pneumatic tire to the outer diameter OD, SW / OD ⁇ 0.3
- the groove area ratio in the contact area in the tread portion is GR,
- the range located on the vehicle side from the tire equator line in the ground contact area is the tire inner area Ai
- the groove area ratio in the tire inner area Ai is GRi
- the ground contact region is 10 [%] ⁇ GR ⁇ 25 [%] GRo ⁇ GRi 0.1 ⁇ (GRi ⁇ GRo) /GR ⁇ 0.6 It is characterized by being formed to satisfy A pneumatic tire
- the pneumatic tire of the present invention it is possible to improve the steering stability performance deteriorated by reducing the rolling resistance.
- the meridional sectional view of the pneumatic tire according to the embodiment of the present invention The plane development view showing a part of the tread part of the pneumatic tire concerning the embodiment of the present invention.
- FIG. 1 is a meridional sectional view of a pneumatic tire 1 according to an embodiment of the present invention.
- the pneumatic tire 1 of this embodiment has the same meridional cross-sectional shape as the conventional pneumatic tire.
- the meridional cross-sectional shape of the pneumatic tire refers to a cross-sectional shape of the pneumatic tire that appears on a plane perpendicular to the tire equatorial plane CL.
- the tire radial direction refers to a direction orthogonal to the rotation axis AX of the pneumatic tire 1.
- the tire circumferential direction refers to a direction rotating around the rotation axis AX (see FIG. 2).
- the tire width direction refers to a direction parallel to the rotation axis AX.
- the tire equatorial plane CL is a plane that is orthogonal to the rotation axis AX of the pneumatic tire 1 and passes through the center of the tire width of the pneumatic tire 1.
- the tire equator line is a line along the tire circumferential direction of the pneumatic tire 1 on the tire equator plane CL. In the present specification and drawings, the same sign “CL” as that of the tire equator plane is attached to the tire equator line.
- the pneumatic tire 1 of the present embodiment includes a pair of bead portions 2, sidewall portions 3 connected to the bead portions, and a tread portion 10 that connects the sidewall portions in a tire meridian cross-sectional view.
- the internal structure of the pneumatic tire is not particularly limited.
- the internal structure of the pneumatic tire should be different depending on the performance and design required for the pneumatic tire, and is preferably determined so as to satisfy various requirements by, for example, experiments and simulations.
- the pneumatic tire 1 of the present embodiment has a ratio between the total width SW and the outer diameter OD, SW / OD ⁇ 0.3 ⁇ ⁇ ⁇ ⁇ 1> It is formed to satisfy the relationship.
- the total width SW is the value when the rim of the pneumatic tire 1 is assembled and the internal pressure is filled at 230 [kPa] (an arbitrarily set internal pressure) in order to define the dimensions of the pneumatic tire 1.
- the distance between the sidewalls including the design on the sidewalls in a loaded state, and the outer diameter OD is the outer diameter of the tire at this time.
- the internal pressure of 230 [kPa] is selected in order to define the dimensions of the pneumatic tire. Therefore, the pneumatic tire 1 according to the present invention exhibits the effect of the present invention as long as it is filled with an internal pressure in a range normally used, and is filled with an internal pressure of 230 [kPa]. It should be noted that this is not essential for practicing the present invention.
- the rim used in the present invention has a rim diameter suitable for the inner diameter of the pneumatic tire 1 and is assembled with the nominal section Sn of the tire cross-sectional width in accordance with ISO4000-1: 2001.
- FIG. 2 is a plan development view showing a part of the tread portion 10 of the pneumatic tire 1 according to the embodiment of the present invention.
- the description will be made assuming that the right side of the tire equator line CL is the vehicle side when the vehicle is mounted and the left side of the tire equator line CL is the side opposite to the vehicle side when the vehicle is mounted. That is, in this specification and drawings, the pneumatic tire 1 is described as being mounted on the left side of the vehicle.
- the tread portion 10 of the pneumatic tire 1 of the present embodiment includes four circumferential grooves 12A, 12B, 12C, and 12D that extend in the tire circumferential direction and land that is partitioned by the circumferential grooves 12A, 12B, 12C, and 12D. Portions 14A, 14B, 14C, 14D, and 14E are formed. Each of the land portions 14A, 14B, 14C, 14D, and 14E extends in a direction crossing the tire circumferential direction, which is the grooves 12 and 16 disposed in the tread portion 10 other than the circumferential grooves 12A, 12B, 12C, and 12D. A plurality of width direction grooves 16A, 16B, 16C, 16D, and 16E are formed.
- the circumferential groove 12 and the width direction groove 16 are collectively referred to as grooves 12 and 16, and in the present invention, the width direction groove 16 has a groove width of 1.5 to 8 mm. As shown in FIG. 2, an asymmetric pattern is formed in the tread portion 10 by the configuration of the grooves 12 and 16 and the land portion 14.
- the groove area ratio GR to the contact area is: It is formed so as to satisfy the following relationship. 10 [%] ⁇ GR ⁇ 25 [%] ... ⁇ 2> GRo ⁇ GRi ... ⁇ 3> 0.1 ⁇ (GRi ⁇ GRo) /GR ⁇ 0.6 (4)
- the ground contact region G is a structure in which the pneumatic tire 1 is assembled on the rim described above, filled with an internal pressure of 230 [kPa], and applied with a load corresponding to 80% of the load capacity to be grounded on a plane. This is the area of the ground contact surface.
- the contact width W is the maximum width in the tire width direction within the contact area.
- the contact length L is the maximum length in the tire circumferential direction within the contact region.
- the load capacity is determined based on ISO 4000-1: 1994. However, there is a description that the size for which the load capacity index is not set in the ISO standard is determined individually and calculated in consideration of the consistency with the standards of other countries. It is calculated based on the standard.
- the tire inner area Ai is a range that is located on the vehicle side from the tire equator line CL in the ground contact area G and has a width that is half of the ground contact width W when the vehicle is mounted.
- the region Ao is a range that is located on the opposite side of the vehicle from the tire equator line CL in the ground contact region and is half the ground contact width W when the vehicle is mounted.
- the contact groove area ratio GRi in the tire inner region Ai is a ratio of the groove area to the sum of the land area and the groove area in the tire inner region Ai
- the contact groove area ratio in the tire outer region Ao is GRo is the ratio of the groove area to the sum of the land area and the groove area in the tire outer region Ao.
- the pneumatic tire 1 according to the present embodiment can provide the following operational effects.
- the pneumatic tire 1 according to the present embodiment is formed so that the ratio between the total width SW and the outer diameter OD satisfies the relationship of the above-described formula ⁇ 1>.
- the front projected area of the pneumatic tire 1 is small, the air resistance around the tire is reduced, and consequently the rolling resistance of the pneumatic tire 1 can be reduced.
- the total width SW is simply reduced, the load capacity of the pneumatic tire 1 is reduced.
- the outer diameter OD is relatively large with respect to the total width SW by satisfying the formula ⁇ 1>, the load capacity The decrease can be suppressed.
- the pneumatic tire 1 according to the present embodiment is formed such that the groove area ratio GR with respect to the ground contact area takes a value in the range indicated by the above formula ⁇ 2>.
- the range of the groove area ratio GR is set lower than that of a general pneumatic tire. Thereby, the rigidity of the tread portion 10 is increased by increasing the area where the land portion 14 is grounded, and the steering stability can be improved. If the groove area ratio GR is higher than 25%, the rigidity of the tread portion 10 is lowered, and a cornering force cannot be sufficiently obtained, and it becomes difficult to improve the steering stability. As described above, when the total width SW is narrow, drainage performance is improved. However, when the groove area ratio GR is lower than 10%, the grooves 12 and 16 provided in the tread portion 10 are reduced, and the grounding region G is sufficiently provided. It cannot be drained, and it becomes difficult to maintain drainage comprehensively.
- the groove area ratio GR in the contact area G, the contact groove area ratio GRo in the tire outer area Ao, and the contact groove area ratio GRi in the tire inner area Ai are described above.
- the grooves provided in the tire outer region Ao are smaller than the tire inner region Ai.
- the pneumatic tire 1 according to the present embodiment can reduce the drainage due to the relatively low groove area ratio GR as described in (2), and the groove area ratio GRi of the tire inner region Ai can be set to the outside of the tire. It can be suppressed by making it larger than the groove area ratio GRo of the region Ao.
- the pneumatic tire 1 according to the present embodiment has a relatively large outer diameter OD and a narrow total width SW as compared with a pneumatic tire of a general size. Therefore, it is possible to expect a space saving of the automobile and an improvement in design.
- the groove area ratios GR, GRi, GRo are 15 [%] ⁇ GR ⁇ 22 [%] and / or 0.2 ⁇ (GRi ⁇ GRo) /GR ⁇ 0.4 It is more preferable that the above relationship is satisfied. This is because the rigidity of the tread portion 10 in the tire outer region Ao is enhanced while suppressing deterioration of drainage to a high degree, and as a result, steering stability can be improved.
- a plurality of width direction grooves 16 are arranged in the tread portion 10.
- the relationship between the groove area ratio GRLo of the groove 16 and the groove area ratio GRLi of the width direction groove 16 in the tire inner region Ai is: 1.1 ⁇ GRLi / GRLo ⁇ 1.9... ⁇ 5> It is preferable to satisfy This is because it is possible to achieve a high degree of compatibility between suppressing the deterioration of drainage and improving the handling stability by increasing the block rigidity and the contact area.
- channels 16A and 16B arrange
- channels 16 arrange
- the number of the width direction grooves 16C, 16D, 16E located in the tire inner region Ai is 40 to 80.
- the number of the width direction grooves 16C, 16D, and 16E is the same as the width direction groove 16C, the width direction groove 16D, and the width direction grooves 16C, 16D, and 16E that are aligned in the tire circumferential direction and that are adjacent to each other. This is the total number of any of the width direction grooves 16E over the entire tire circumference.
- the tread portion 10 includes the circumferential grooves 12C and 12D (corresponding to the inner circumferential grooves) in the tire inner region Ai and the circumferential grooves 12A in the tire outer region Ao as described above. 12B (corresponding to the outer circumferential groove).
- the relationship between the groove area ratio GRBi of the circumferential grooves 12C and 12D located in the tire inner area Ai and the groove area ratio GRBoi of the circumferential grooves 12A and 12B located in the tire outer area Ao is 1 ⁇ GRBi / GRBoi ⁇ 2 ( ⁇ 7>) It is preferable to satisfy This is because by increasing the groove area ratio GRBi of the circumferential grooves 12C and 12D located in the tire inner region Ai, it is possible to further suppress the deterioration of drainage.
- both the circumferential groove 12 and the width groove 16 are provided in the tread portion 10 of the pneumatic tire 1 of the present embodiment.
- grooves 12 and 16 are provided in the tread portion 10 of the pneumatic tire 1, and at least the expressions ⁇ 2> to ⁇ 4> are satisfied in the ground contact region G of the pneumatic tire 1. Just do it.
- the tread portion 10 of the pneumatic tire 1 of the present invention is provided with either the circumferential groove 12 or the width direction groove 16 so as to satisfy at least the formulas ⁇ 2> to ⁇ 4>. Good.
- FIG. 3 is a developed plan view showing a part of a tread portion of a pneumatic tire according to a modification of the embodiment of the present invention.
- a tire outer inner region Aoi and a tire outer outer region Aoo are defined.
- the tire outside inner region Aoi is a range having a width of 25% of the ground contact width W located on the tire equator line CL side in the tire outer region Ao.
- the outer tire outer area Aoo is a range having a width of 25% of the ground contact width W located on the ground contact end side in the tire width direction other than the tire outer inner area Aoi in the tire outer area Ao.
- a circumferential groove 12A extending in the tire circumferential direction is provided in the tire outside inner region Aoi, but a circumferential groove 12 is provided in the tire outside outer region Aoo. It is not preferable.
- a tire width direction distance from the contact width end portion GE to the circumferential groove 12A can be secured, thereby increasing the tire width direction rigidity of the tread portion 10 and, in turn, steering during cornering. This is because the stability can be improved.
- tire performance tests were conducted on pneumatic tires having various conditions with respect to RRC index, fuel efficiency index, steering stability, and hydroplaning performance (drainage resistance).
- RRC index In accordance with ISO28580, using a drum tester having a drum diameter of 1707.6 [mm], rolling resistance was measured under conditions of an air pressure of 210 [kPa] and a speed of 80 [km / h]. The evaluation results are shown as an index with the conventional example being 100, using the reciprocal of the measured value. The smaller the index value, the lower the rolling resistance.
- the test tire was mounted on a front-wheel drive vehicle with a displacement of 1800 cc, the test course with a total length of 2 km was run 50 laps at a speed of 100 km / h, and the fuel consumption improvement rate when the fuel consumption rate of the conventional example was set to 100 was measured.
- the test tires were assembled on a standard rim and mounted on a passenger car (displacement of 1800cc), and the feeling of driving 3 laps while changing the lane of the 2km test course was evaluated by three specialized drivers.
- the average value of the evaluation points of each test tire when the average value of the feeling evaluation points of Comparative Example 1 was set to 100 was expressed as an index. The larger the index value, the better the steering stability.
- the pneumatic tire according to the conventional example has a tire size of 205 / 55R16 and a value of “SW / OD” of 0.32, that is, does not satisfy the formula ⁇ 1>.
- the tread pattern shown in FIG. 4 is provided in the tread portion of the pneumatic tire according to the conventional example.
- Examples 1 to 14 The pneumatic tires according to Examples 1 to 14 have different tire sizes, and “SW / OD” takes a value in the range of 0.30 to 0.21, that is, satisfies the formula ⁇ 1>.
- the tread portion 10 of the pneumatic tire according to each of Examples 1 to 14 is provided with a tread pattern that is modified to fit each tire size based on the tread pattern shown in FIG.
- the test tires according to Examples 1 to 14 satisfying the formula ⁇ 1> are superior in fuel consumption index to the conventional example. From the performance test results, it was confirmed that, among the tire sizes tested, the tire size 165 / 55R20 (Example 11) sufficiently improved the fuel consumption with respect to the tire size 205 / 55R16. Therefore, this tire size is used for subsequent tests on the tread pattern.
- Example 15 to 17, Comparative Examples 1 to 3 The pneumatic tires according to Examples 15 to 17 and Comparative Examples 1 to 3 have a tire size of 165 / 55R20.
- the pneumatic tire according to Comparative Example 1 is a test tire in which only the tire size is changed from the conventional example.
- “(GRi-GRo) / GR” is 0.4 and the groove area ratio GR is allocated within the range of 8 to 30%.
- Examples 15 to 17 satisfy all the relationships of the formulas ⁇ 1> to ⁇ 4>, but Comparative Examples 1 to 3 do not satisfy the relationship of the formula ⁇ 2>.
- Comparative Example 1 is a reference tire for handling stability as described above. That is, in the present invention, the steering stability is based on a state in which the rolling resistance is changed to a narrow and large tire size and the steering stability is lowered. And the pneumatic tire which concerns on an Example shall be evaluated about how much the steering stability improved from the comparative example 1.
- each of the tread pattern of the conventional example that is, the groove area ratio GR set in each test tire based on the tread pattern of FIG.
- a tread pattern is provided that is modified to fit the dimensional parameters.
- the tread pattern shown in FIG. 2 is provided in the tread portion of the pneumatic tire according to the sixteenth embodiment.
- the groove area of the circumferential groove 12 and the width direction groove 16 By changing the number of circumferential grooves 12 and the position in the tire width direction, etc., each dimension parameter of each test tire is adapted.
- test tires according to Examples 15 to 17 that satisfy the relations of the formulas ⁇ 1> to ⁇ 4> exceed the conventional examples in the fuel consumption index, and the comparative tires in the steering stability. Exceed. That is, these test tires can improve the steering stability performance deteriorated by reducing the rolling resistance.
- Example 16 18, and 19 and Comparative Examples 4 to 6 The pneumatic tires according to Examples 16, 18, and 19 and Comparative Examples 4 to 6 have a tire size of 165 / 55R20, a groove area ratio GR of 20 [%], and “(GRi-GRo) / GR”. Are test tires distributed in the range of -0.4 to 0.8.
- the tread portion of the pneumatic tire according to the example and the comparative example is provided with a tread pattern that is changed based on the tread pattern shown in FIG.
- the pneumatic tires according to Examples 16, 18, and 19 satisfy the relationships of the formulas ⁇ 1> to ⁇ 4>.
- the pneumatic tires according to Comparative Examples 4 to 6 do not satisfy the relationship of Formula ⁇ 4>, and the pneumatic tires according to Comparative Examples 4 and 5 do not satisfy the relationship of Formula ⁇ 3>.
- Performance tests on fuel efficiency index, steering stability, and hydroplaning performance were performed on the pneumatic tires according to the conventional example, comparative examples 1, 4 to 6, and examples 16, 18, and 19.
- Table 5 shows numerical values and conditions related to the dimensions of each test tire, and performance test results.
- the pneumatic tires according to Examples 16, 18, and 19 satisfying the relations of the formulas ⁇ 1> to ⁇ 4> exceeded the conventional examples in the fuel consumption index, and compared in the handling stability. Exceeds Example 1. Furthermore, the pneumatic tires according to Examples 16, 18, and 19 are superior to the pneumatic tires according to Comparative Examples 4 to 6 in terms of the balance between steering stability and hydroplaning performance.
- Example 20 to 24 The pneumatic tires according to Examples 20 to 24 have a tire size of 165 / 55R20, and as described above, these tread portions have tread patterns modified based on the tread pattern shown in FIG. Is provided.
- the pneumatic tires according to Examples 21 to 23 satisfy the relationship of the formula ⁇ 5> in addition to the formulas ⁇ 1> to ⁇ 4>, but the pneumatic tires according to the examples 20 and 24 have the formula ⁇ 5>. 5> relationship is not satisfied.
- the pneumatic tires according to the conventional example, the comparative example 1 and the examples 20 to 24 were subjected to performance tests regarding the fuel efficiency index, the handling stability, and the anti-hydroplaning performance.
- Table 6 shows numerical values and conditions related to the dimensions of each test tire, and performance test results.
- Example 25 to 28 The pneumatic tires according to Examples 25 to 28 have a tire size of 165 / 55R20. As described above, these tread portions have tread patterns modified based on the tread pattern shown in FIG. Is provided.
- the pneumatic tires according to Examples 25 to 27 satisfy the relationship of Formula ⁇ 6> in addition to Formulas ⁇ 1> to ⁇ 5>, while the pneumatic tire according to Example 28 has Formula ⁇ 6>. Does not satisfy the relationship.
- the pneumatic tires according to the conventional example, the comparative example 1 and the examples 25 to 28 were subjected to performance tests regarding the fuel consumption index, the handling stability, and the anti-hydroplaning performance.
- Table 7 shows numerical values and conditions related to the dimensions of each test tire, and performance test results.
- Example 29 and 30 The pneumatic tires according to Examples 29 and 30 have a tire size of 165 / 55R20, and as described above, these tread portions are provided with a tread pattern that is changed based on FIG. In addition, the tread pattern shown by FIG. 3 is provided in the tread part of the pneumatic tire which concerns on Example 30.
- FIG. 3 the pneumatic tire according to Example 29 is provided with a circumferential groove in the outer outer region Aoo, but is not provided with a circumferential groove in the outer outer region Aoi.
- the pneumatic tire according to the example 30 is provided with the circumferential groove 12A (FIG. 3) in the tire outer inner region Aoi, while the tire outer outer region Aoo is provided with the circumferential groove. No.
- Performance tests relating to fuel efficiency index, steering stability and anti-hydroplaning performance were performed on the pneumatic tires according to the conventional example, comparative example 1 and examples 29 and 30.
- Table 8 shows numerical values and conditions relating to the dimensions of the test tires, and performance test results.
- “Aoi” is the tire outer inner region Aoi
- “Aoo” is the tire outer outer region Aoo
- “Aoi, Aoo” is the tire outer inner region Aoi. It is shown that the circumferential groove 12 is provided in both the outer tire outer region Aoo.
- the pneumatic tire according to Example 30 in which the circumferential groove is provided in the tire outside inner region Aoi is Example 29 in which the circumferential groove is not provided in the tire outside inner region Aoi.
- the steering stability performance and hydroplaning performance are higher.
- Examples 30 to 34 In the pneumatic tires according to Examples 30 to 34, the tire size is 165 / 55R20, and the circumferential groove 12 is provided in the tire outside inner region Aoi, while the circumferential groove 12 is provided in the tire outside outer region Aoo. Is a test tire in which “GRBi / GRBo” is assigned in the range of 0.9 to 2.1. As described above, the tread portion of the pneumatic tire according to these embodiments is provided with a tread pattern that is modified based on FIG. Here, while the pneumatic tire according to Examples 30, 32, and 33 satisfies the relationship of the formula ⁇ 7>, the pneumatic tire according to Examples 31 and 34 satisfies the relationship of the formula ⁇ 7>. Not.
- the pneumatic tires according to the conventional example, the comparative example 1, and the examples 30 to 34 were subjected to performance tests regarding the fuel consumption index, the handling stability, and the anti-hydroplaning performance.
- Table 9 shows numerical values and conditions relating to the dimensions of each test tire, and performance test results.
- the groove area ratio in the contact area in the tread portion is GR
- the range located on the vehicle side from the tire equator line in the ground contact area is the tire inner area Ai
- the groove area ratio in the tire inner area Ai is GRi
- the ground contact region is 10 [%] ⁇ GR ⁇ 25 [%] GRo ⁇ GRi 0.1 ⁇ (GRi ⁇ GRo) /GR ⁇ 0.6 It is characterized by being formed to satisfy Pneumatic tire.
- the tread portion is provided with a plurality of width direction grooves extending in a direction crossing the tire circumferential direction.
- the groove area ratio of the width direction groove in the ground contact area is GRL
- the groove area ratio of the width direction groove in the tire outer area Ao is GRLo
- the groove area ratio of the width direction groove in the tire inner area Ai is GRLi.
- the widthwise grooves are arranged at intervals in the tire circumferential direction, When the number of the width direction grooves arranged in the tire inner area Ai is Pi and the number of the width direction grooves arranged in the tire outer area Ao is Po in the entire circumference of the tread portion of the pneumatic tire. In addition, 1 ⁇ Pi / Po ⁇ 2 It is characterized by satisfying, The pneumatic tire according to (2).
- a region having a width of 25% of the contact width located on the tire equator line side in the tire outer region Ao is defined as a tire outer inner region Aoi, and the tire outer inner region in the tire outer region Ao.
- a range other than Aoi is defined as the outer area Aoo outside the tire, A circumferential groove extending in the tire circumferential direction is provided in the tire outside inner area Aoi, but is not provided in the tire outside outer area Aoo.
- An inner circumferential groove that is a circumferential groove extending in the tire circumferential direction in the tire inner region Ai and an outer circumferential groove that is a circumferential groove extending in the tire circumferential direction in the tire outer region Ao are provided.
- the groove area ratio of the inner circumferential groove in the tire inner area Ai is GRBi
- the groove area ratio of the outer circumferential groove in the tire outer area Ao is GRBo, 1 ⁇ GRBi / GRBo ⁇ 2 It is characterized by satisfying, The pneumatic tire according to any one of (1) to (4).
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Abstract
Description
トレッド部に溝によって形成された非対称パターンが形成されている空気入りタイヤであって、
前記空気入りタイヤの総幅SWと外径ODとの比であるSW/ODが、
SW/OD ≦ 0.3
を満たし、
前記トレッド部における接地領域での溝面積比率をGRとし、
車両装着時において、接地領域におけるタイヤ赤道線から車両側に位置する範囲をタイヤ内側領域Aiとし、前記タイヤ内側領域Aiにおける溝面積比率をGRiとし、車両装着時において、接地領域におけるタイヤ赤道線から車両側とは反対側に位置する範囲をタイヤ外側領域Aoとし、前記タイヤ外側領域Aoにおける溝面積比率をGRoとしたときに、前記接地領域は、
10[%] ≦ GR ≦ 25[%]
GRo < GRi
0.1 ≦ (GRi-GRo)/GR ≦ 0.6
を満たして形成されていることを特徴とする、
空気入りタイヤが提供される。
これより、本発明の実施形態に係る空気入りタイヤ1について図面を参照しつつ説明する。図1は、本発明の実施形態の空気入りタイヤ1の子午断面図である。なお、本実施形態の空気入りタイヤ1は、従来の空気入りタイヤと同様の子午断面形状を有する。ここで、空気入りタイヤの子午断面形状とは、タイヤ赤道面CLと垂直な平面上に現れる空気入りタイヤの断面形状をいう。
SW/OD ≦ 0.3 ・・・<1>
の関係を満たすように形成されている。
10[%] ≦ GR ≦ 25[%] ・・・<2>
GRo < GRi ・・・<3>
0.1 ≦ (GRi-GRo)/GR ≦ 0.6 ・・・<4>
X=K×2.735×10-5×P0.585×Sd1.39×(DR-12.7+Sd)
但し、X=負荷能力[kg]
K=1.36
P=230(=空気圧[kPa])
Sd=0.93×S.75-0.637d
S.75=S×((180°-Sin-1((Rm/S))/131.4°)
S=設計断面幅[mm]
Rm=設計断面幅に対応したリム幅[mm]
d=(0.9-偏平比[-])×S.75-6.35
DR=リム径の基準値[mm]
例えば205/55R16(SW/OD=0.32))の空気入りタイヤと比較すると、外径ODに対して総幅SWが狭くなる。その結果、空気入りタイヤ1の前方投影面積が小さく、タイヤ周辺の空気抵抗が低減され、ひいては空気入りタイヤ1の転がり抵抗を低減することができる。その一方で、単に総幅SWを狭くすると空気入りタイヤ1の負荷能力が低下するが、式<1>を満たすことにより外径ODが総幅SWに対して相対的に大きいので、負荷能力の低下を抑制することができる。
15[%] ≦ GR ≦ 22[%]、及び/又は、
0.2 ≦ (GRi-GRo)/GR ≦ 0.4
の関係を満たすとさらに好ましい。さらに高度に、排水性の悪化を抑制しつつ、タイヤ外側領域Aoにおけるトレッド部10の剛性が高くなり、ひいては操縦安定性を向上させることができるからである。
1.1 ≦ GRLi/GRLo ≦ 1.9 ・・・<5>
を満たすと好ましい。排水性の悪化抑制と、ブロック剛性及び接地面積の増加による操縦安定性の向上とをさらに、高度に両立させることができるからである。なお、一方では「GRLi/GRLo」が1.1よりも小さいと、排水性の悪化を抑制する効果が充分ではなくなる。他方では、「GRLi/GRLo」が1.9よりも大きいと、タイヤ内側領域Aiにおけるトレッド部10のブロック剛性の低下が顕著となり、操縦安定性が低下してしまうおそれがある。
1 < Pi/Po ≦ 2 ・・・<6>
を満たすとさらに好ましい。タイヤ外側領域Aoよりもタイヤ内側領域Aiにより多くの幅方向溝16を配置することによって、排水性の向上が見込め、さらに、排水性の悪化抑制と、ブロック剛性及び接地面積の増加による操縦安定性の向上とを、より一層高度に両立させることができるからである。
1 ≦GRBi/GRBoi ≦ 2 ・・・<7>
を満たすと好ましい。タイヤ内側領域Aiに位置する周方向溝12C、12Dの溝面積比率GRBiを大きくすることによって、排水性の悪化をさらに抑制することができるからである。
図3は、本発明の実施形態の変形例に係る空気入りタイヤのトレッド部の一部を示す平面展開図である。ここで、図3を参照しつつ、タイヤ外内側領域Aoi及びタイヤ外外側領域Aooを定義する。タイヤ外内側領域Aoiは、タイヤ外側領域Aoのうちのタイヤ赤道線CL側に位置する、接地幅Wの25%の幅を有する範囲である。そして、タイヤ外外側領域Aooは、タイヤ外側領域Aoのうちの、タイヤ外内側領域Aoi以外の、タイヤ幅方向の接地端側に位置する、接地幅Wの25%の幅を有する範囲である。
ISO28580に準拠して、ドラム径1707.6[mm]のドラム試験機を用い、空気圧210[kPa]、速度80[km/h]の条件で転がり抵抗を測定した。評価結果は、測定値の逆数を用い、従来例を100とする指数にて示した。この指数値が小さいほど転がり抵抗が低いことを意味する。
テストタイヤを排気量1800ccの前輪駆動車に装着し、全長2kmのテストコースを時速100km/hにて50周走行し、従来例の燃料消費率を100としたときの燃費改善率を測定した。指数が大きいほど燃費が良いことを表している。
テストタイヤを標準リムにリム組みして乗用車(排気量1800cc)に装着し、1周2kmのテストコースをレーンチェンジしながら3周走行したときのフィーリングを3人の専門ドライバーにより評価した。評価結果は、比較例1のフィーリング評価点の平均値を100としたときの、各テストタイヤの評価点の平均値を指数で表示した。この指数値が大きいほど操縦安定性が優れていることを示す。
直線ハイドロプレーニング試験を行い、ハイドロプレーニングが発生した速度を計測して評価した。この直線ハイドロプレーニング試験は、水深10mmのプールを、速度を上げながら進入し、そのときの空気入りタイヤのスリップ率を測定する。このときのスリップ率が10%となったときをハイドロプレーニング発生速度とする。この試験では従来例での計測結果を100として他の例の計測結果を指数化した。本実施例では、指数の値が大きいほど耐ハイドロプレーニング性能が優れていることを示す。
(従来例)
従来例に係る空気入りタイヤは、タイヤサイズが205/55R16であり、その「SW/OD」の値が0.32であり、すなわち式<1>を満たさない。従来例に係る空気入りタイヤのトレッド部には、図4に示されているトレッドパターンが設けられている。
実施例1~14に係る空気入りタイヤは、タイヤサイズがそれぞれ異なり、「SW/OD」が0.30~0.21の範囲の値を取り、すなわち式<1>を満たす。実施例1~14に係る空気入りタイヤのトレッド部10には、図4に示されているトレッドパターンを基礎として各タイヤサイズに適合するように変更されたトレッドパターンが設けられている。
実施例15~17及び比較例1~3に係る空気入りタイヤは、タイヤサイズが165/55R20である。比較例1に係る空気入りタイヤは、タイヤサイズのみが従来例から変更されたテストタイヤである。そして、実施例15~17及び比較例2~3に係る空気入りタイヤは、「(GRi-GRo)/GR」が0.4でありかつ溝面積比率GRが8~30%の範囲で振り分けられたテストタイヤである。ここで、実施例15~17は式<1>~<4>の関係の全てを満たしているが、比較例1~3は式<2>の関係を満たさない。
実施例16、18、19及び比較例4~6に係る空気入りタイヤは、タイヤサイズが165/55R20であり、溝面積比率GRが20[%]であり、「(GRi-GRo)/GR」が-0.4~0.8の範囲で振り分けられたテストタイヤである。上述のように、これら実施例及び比較例に係る空気入りタイヤのトレッド部には、図4に示されたトレッドパターンを基礎として変更されたトレッドパターンが設けられている。ここで、実施例16、18、19に係る空気入りタイヤは式<1>~<4>の関係を満たしている。その一方で、比較例4~6に係る空気入りタイヤは式<4>の関係を満たさず、さらに比較例4、5に係る空気入りタイヤは、式<3>の関係も満たさない。
実施例20~24に係る空気入りタイヤは、タイヤサイズが165/55R20であり、上述のように、これらのトレッド部には、図4に示されているトレッドパターンを基礎として変更されたトレッドパターンが設けられている。ここで、実施例21~23に係る空気入りタイヤは、式<1>~<4>に加えて、式<5>の関係を満たすが、実施例20、24に係る空気入りタイヤは式<5>の関係を満たさない。
実施例25~28に係る空気入りタイヤは、タイヤサイズが165/55R20であり、上述のように、これらのトレッド部には、図4に示されているトレッドパターンを基礎として変更されたトレッドパターンが設けられている。ここで、実施例25~27に係る空気入りタイヤは、式<1>~<5>に加えて、式<6>の関係を満たすが、実施例28に係る空気入りタイヤは式<6>の関係を満たさない。
実施例29、30に係る空気入りタイヤは、タイヤサイズが165/55R20であり、上述のように、これらのトレッド部には、図4を基礎として変更されたトレッドパターンが設けられている。なお、実施例30に係る空気入りタイヤのトレッド部には、図3に示されているトレッドパターンが設けられている。一方では、実施例29に係る空気入りタイヤには、タイヤ外外側領域Aooに周方向溝が設けられている一方で、タイヤ外内側領域Aoiには周方向溝が設けられてはいない。他方では、実施例30に係る空気入りタイヤには、タイヤ外内領域Aoiに周方向溝12A(図3)が設けられている一方で、タイヤ外外側領域Aooには周方向溝が設けられてはいない。
実施例30~34に係る空気入りタイヤは、タイヤサイズが165/55R20であり、タイヤ外内領域Aoiに周方向溝12が設けられている一方で、タイヤ外外側領域Aooには周方向溝12が設けられておらず、なおかつ「GRBi/GRBo」が0.9~2.1の範囲で振り分けられたテストタイヤである。上述のように、これら実施例に係る空気入りタイヤのトレッド部には、図4を基礎として変更されたトレッドパターンが設けられている。ここで、実施例30、32、33に係る空気入りタイヤは、式<7>の関係を満たしている一方で、実施例31、34に係る空気入りタイヤは、式<7>の関係を満たしていない。
前記空気入りタイヤの総幅SWと外径ODとの比であるSW/ODが、
SW/OD ≦ 0.3
を満たし、
前記トレッド部における接地領域での溝面積比率をGRとし、
車両装着時において、接地領域におけるタイヤ赤道線から車両側に位置する範囲をタイヤ内側領域Aiとし、前記タイヤ内側領域Aiにおける溝面積比率をGRiとし、車両装着時において、接地領域におけるタイヤ赤道線から車両側とは反対側に位置する範囲をタイヤ外側領域Aoとし、前記タイヤ外側領域Aoにおける溝面積比率をGRoとしたときに、前記接地領域は、
10[%] ≦ GR ≦ 25[%]
GRo < GRi
0.1 ≦ (GRi-GRo)/GR ≦ 0.6
を満たして形成されていることを特徴とする、
空気入りタイヤ。
前記接地領域での前記幅方向溝の溝面積比率をGRLとし、前記タイヤ外側領域Aoにおける幅方向溝の溝面積比率をGRLoとし、前記タイヤ内側領域Aiにおける幅方向溝の溝面積比率をGRLiとしたときに、
1.1 ≦ GRLi/GRLo ≦ 1.9
を満たすこと特徴とする、
(1)に記載の空気入りタイヤ。
前記空気入りタイヤの前記トレッド部の全周において、前記タイヤ内側領域Aiに配置された幅方向溝の本数をPiとし、前記タイヤ外側領域Aoに配置された幅方向溝の本数をPoとしたときに、
1 < Pi/Po ≦ 2
を満たすことを特徴とする、
(2)に記載の空気入りタイヤ。
タイヤ周方向に延びる周方向溝が、前記タイヤ外内側領域Aoiには設けられているが、前記タイヤ外外側領域Aooには設けられていないことを特徴とする、
(1)~(3)のいずれか1つに記載の空気入りタイヤ。
前記タイヤ内側領域Aiにおける前記内側周方向溝の溝面積比率をGRBiとし、前記タイヤ外側領域Aoにおける前記外側周方向溝の溝面積比率をGRBoとしたとき、
1 ≦GRBi/GRBo ≦ 2
を満たすことを特徴とする、
(1)~(4)のいずれか1つに記載の空気入りタイヤ。
10 トレッド部
12 周方向溝(溝)
16 幅方向溝(溝)
Ai タイヤ内側領域
Ao タイヤ外側領域
G 接地領域
GR 溝面積比率
GRi タイヤ内側領域における溝面積比率
GRo タイヤ外側領域における溝面積比率
OD 外径
SW 総幅
Claims (5)
- トレッド部に溝によって形成された非対称パターンが形成されている空気入りタイヤであって、
前記空気入りタイヤの総幅SWと外径ODとの比であるSW/ODが、
SW/OD ≦ 0.3
を満たし、
前記トレッド部における接地領域での溝面積比率をGRとし、
車両装着時において、接地領域におけるタイヤ赤道線から車両側に位置する範囲をタイヤ内側領域Aiとし、前記タイヤ内側領域Aiにおける溝面積比率をGRiとし、車両装着時において、接地領域におけるタイヤ赤道線から車両側とは反対側に位置する範囲をタイヤ外側領域Aoとし、前記タイヤ外側領域Aoにおける溝面積比率をGRoとしたときに、前記接地領域は、
10[%] ≦ GR ≦ 25[%]
GRo < GRi
0.1 ≦ (GRi-GRo)/GR ≦ 0.6
を満たして形成されていることを特徴とする、
空気入りタイヤ。 - 前記トレッド部には、タイヤ周方向を横断する方向に延びる複数の幅方向溝が設けられ、
前記接地領域での前記幅方向溝の溝面積比率をGRLとし、前記タイヤ外側領域Aoにおける幅方向溝の溝面積比率をGRLoとし、前記タイヤ内側領域Aiにおける幅方向溝の溝面積比率をGRLiとしたときに、
1.1 ≦ GRLi/GRLo ≦ 1.9
を満たすこと特徴とする、
請求項1に記載の空気入りタイヤ。 - 前記幅方向溝は、タイヤ周方向に間隔をもって配置されており、
前記空気入りタイヤの前記トレッド部の全周において、前記タイヤ内側領域Aiに配置された幅方向溝の本数をPiとし、前記タイヤ外側領域Aoに配置された幅方向溝の本数をPoとしたときに、
1 < Pi/Po ≦ 2
を満たすことを特徴とする、
請求項2に記載の空気入りタイヤ。 - 前記タイヤ外側領域Aoのうちのタイヤ赤道線側に位置する、接地幅の25%の幅を有する範囲をタイヤ外内側領域Aoiとし、前記タイヤ外側領域Aoのうちの前記タイヤ外内側領域Aoi以外の範囲をタイヤ外外側領域Aooとしたときに、
タイヤ周方向に延びる周方向溝が、前記タイヤ外内側領域Aoiには設けられているが、前記タイヤ外外側領域Aooには設けられていないことを特徴とする、
請求項1~3のいずれか1項に記載の空気入りタイヤ。 - 前記タイヤ内側領域Aiにおいてタイヤ周方向に延びる周方向溝である内側周方向溝と、前記タイヤ外側領域Aoにおいてタイヤ周方向に延びる周方向溝である外側周方向溝とが設けられており、
前記タイヤ内側領域Aiにおける前記内側周方向溝の溝面積比率をGRBiとし、前記タイヤ外側領域Aoにおける前記外側周方向溝の溝面積比率をGRBoとしたとき、
1 ≦GRBi/GRBo ≦ 2
を満たすことを特徴とする、
請求項1~4のいずれか1項に記載の空気入りタイヤ。
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US10308075B2 (en) | 2013-12-27 | 2019-06-04 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
US10449803B2 (en) | 2014-06-17 | 2019-10-22 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
JP2019043235A (ja) * | 2017-08-30 | 2019-03-22 | 住友ゴム工業株式会社 | 空気入りラジアルタイヤ |
JP2019043233A (ja) * | 2017-08-30 | 2019-03-22 | 住友ゴム工業株式会社 | 空気入りラジアルタイヤ |
JP2019043237A (ja) * | 2017-08-30 | 2019-03-22 | 住友ゴム工業株式会社 | 空気入りラジアルタイヤ |
JP7481614B2 (ja) | 2020-02-12 | 2024-05-13 | 横浜ゴム株式会社 | 空気入りタイヤ |
Also Published As
Publication number | Publication date |
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US20160001604A1 (en) | 2016-01-07 |
CN105008143B (zh) | 2016-10-26 |
DE112013006726T5 (de) | 2015-11-12 |
CN105008143A (zh) | 2015-10-28 |
US9884518B2 (en) | 2018-02-06 |
DE112013006726B4 (de) | 2019-01-24 |
JP5360333B1 (ja) | 2013-12-04 |
JPWO2014128966A1 (ja) | 2017-02-02 |
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