WO2008075630A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2008075630A1 WO2008075630A1 PCT/JP2007/074153 JP2007074153W WO2008075630A1 WO 2008075630 A1 WO2008075630 A1 WO 2008075630A1 JP 2007074153 W JP2007074153 W JP 2007074153W WO 2008075630 A1 WO2008075630 A1 WO 2008075630A1
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- WO
- WIPO (PCT)
- Prior art keywords
- groove
- main groove
- central
- central main
- pneumatic tire
- 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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
-
- 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
- B60C11/04—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
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
-
- 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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1369—Tie bars for linking block elements and bridging the groove
-
- 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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1392—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block edges
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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
- B60C2011/0388—Continuous ribs provided at the equatorial plane
Definitions
- the present invention relates to a pneumatic tire, and more particularly to a balance-oriented pneumatic tire that is excellent in drainage performance, steering stability, and uneven wear resistance, and also reduces noise.
- a circumferential groove extending along the tire circumferential direction and an inclined groove extending obliquely with respect to the tire circumferential direction are disposed in the tread portion, so that the circumferential groove extends in the front-rear direction of the tire. Drainage and drainage to the side of the tire can be performed by the inclined grooves.
- Patent Document 1 discloses a pair of circumferential main grooves in the tread portion. Are provided to divide the circumferential ribs, and a large number of inclined main grooves that open to the circumferential main grooves are provided. These inclined main grooves have a pattern center side portion as a steeply inclined portion, and a tread end side There is disclosed a directional tread pattern having an extended form in which a portion is a gently inclined portion, and chamfered toward the leading end of an acute angle portion sandwiched between the circumferential main groove and the inclined main groove. According to this tire, the ability to obtain good drainage and steering stability.
- the present inventors have further studied, and on both sides of the acute angle portion, there are a circumferential main groove and an inclined main groove which are spaces.
- a circumferential main groove and an inclined main groove which are spaces.
- the rigidity of the land portion for suppressing the deformation of the block tends to be insufficient when a lateral force is applied.
- Patent Document 2 a central main groove is not provided in the tread portion, a large number of inclined grooves are opened in the side main grooves, and the groove depth is set to the inclined groove toward the pattern center.
- a tire in which a bottom-up region of a groove in which the inclined portion ends in the central region of the tread is formed.
- Patent Document 1 JP-A-9 2025
- Patent Document 2 Japanese Unexamined Patent Publication No. 2006-76349
- an object of the present invention is to optimize the configuration of the acute angle portion of the central land portion in the tread pattern employing the tread pattern in which both the central main groove and the inclined groove are arranged in the tread portion.
- the object is to provide a pneumatic tire with improved drainage and noise while maintaining performance such as handling stability, uneven wear resistance, and riding comfort.
- the gist of the present invention is as follows.
- the invention according to claim 1 is characterized in that, in each half area where the tread portion is divided into two at the pattern center, one central main groove located in the pattern center or in the vicinity thereof and extending along the tire circumferential direction, At least one side main groove located between the central main groove and the tread edge and extending along the tire circumferential direction, and between the central main groove and the side main grooves are relatively small with respect to the tire circumferential direction.
- a plurality of steeply inclined grooves extending at a certain angle are arranged, and the central land is divided by the central main groove and the first lateral main groove adjacent to the central main groove, and the central main groove and the 1
- the main land groove and two steeply inclined grooves adjacent in the circumferential direction of the central land are divided into a number of substantial blocks.
- the steeply inclined groove is provided with an inclined groove bottom whose groove depth gradually increases from the central main groove toward the first side main groove, and is steeply inclined with respect to the central main groove.
- a first chamfered portion whose land height gradually decreases toward the tip of the first acute angle portion sandwiched between the slanted groove and the bottom of the inclined groove and the first chamfered portion are adjacent to each other in the tire width direction. It is characterized by that.
- one central main groove in a half area means a rib-like land extending continuously in the circumferential direction of the pattern on the pattern center, in addition to the case where one central main groove is formed on the pattern center. This includes the case where a pair of central main grooves are provided across the pattern center to form the portion.
- substantially a block is used to include a block even when the opening position of the steeply inclined groove to the central main groove is higher than the groove bottom position of the central main groove.
- the invention according to claim 2 is characterized in that the chamfered length of the first chamfered portion measured in the tire circumferential direction is shorter than the similarly measured extended length of the bottom of the inclined groove. tire.
- chamfering length refers to the direction and length of the chamfered portion along the chamfered surface
- extending length of the inclined groove bottom refers to the inclined surface of the inclined ridge. It shall mean the length along.
- the invention according to claim 3 is the pneumatic tire according to claim 1 or 2, wherein the tip of the first chamfered portion is terminated at the same height position as the bottom of the inclined groove.
- the central main groove side wall portion of the central land block has a predetermined curvature radius along the tire circumferential direction toward the pattern center in a development plan view of the tread pattern.
- substantially continuous means that the case where the steeply inclined groove ends before opening the central main groove is included.
- the invention according to claim 5 is the pneumatic tire according to claim 4, wherein the radius of curvature of the arc portion is 40 to 400 mm.
- the invention according to claim 7 is the block according to any one of claims 1 to 6, wherein the block is provided with a gently inclined groove extending from the first side main groove toward the center main groove. It is a pneumatic tire.
- the invention according to claim 8 is the pneumatic tire according to any one of claims 1 to 7, wherein the steeply inclined groove has an angle with respect to the tire circumferential direction of 5 to 50 °.
- the invention according to claim 9 is the pneumatic tire according to claim 7 or 8, wherein the gently inclined groove has an angle with respect to the tire circumferential direction of 45 to 135 °.
- the invention according to claim 10 is the pneumatic tire according to any one of claims 7 to 9, wherein the block is provided with a sipe extending substantially parallel to the gently inclined groove.
- the central main groove is a pair of central main grooves with the pattern center interposed therebetween, and a rib-like land continuously extending along the tire circumferential direction between the central main grooves.
- a tread pattern in which a central main groove and an inclined groove are disposed in the tread portion is employed, and in the tread pattern, the groove depth of the steeply inclined groove is first from the central main groove.
- An inclined groove bottom that gradually increases toward the side main groove is provided, and a first chamfer with the land height gradually decreasing toward the tip at the first acute angle part of the block sandwiched between the central main groove and the steeply inclined groove. Since the bottom of the inclined groove and the first chamfered part are adjacent to each other in the tire width direction, the space (volume) as a groove can be maintained on the tire surface near the central main groove, ensuring drainage.
- the bottom of the inclined groove and the first chamfered part are adjacent to and support each other inside the groove, and as a result, high land rigidity against bending rigidity against lateral force can be obtained, and steering stability can be ensured. As a result, it has become possible to provide a pneumatic tire with improved drainage and noise while maintaining performance such as steering stability, uneven wear resistance, and riding comfort.
- FIG. 1 is a developed view of a part of a tread pattern of a pneumatic tire according to the present invention.
- FIG. 2 (a) and (b) are cut end views of A-A and B-B in Fig. 1, respectively (c) and (d) FIG. 2 is a cross-sectional view taken along lines C—C and D—D in FIG.
- FIG. 3 is a developed view of a part of a tread portion of another pneumatic tire according to the present invention.
- FIG. 4 (a) and (b) are cross-sectional views taken along lines EE and FF in Fig. 3, respectively.
- FIG. 5 (a), (b), and (c) are perspective views showing various embodiments of an inclined groove bottom according to the present invention.
- FIG. 6 is a perspective view showing various embodiments of the first chamfered portion according to the present invention, ⁇ , (b), and (c).
- FIG. 7 is a developed view of a part of the tread portion of a comparative tire (Comparative Example 1).
- reference numeral 1 is a tread portion
- 2 is a tread end
- 3 is a central main groove
- 4 is a rib-like land portion
- 5 is a first side main groove
- 6 is a central land portion
- 7 is a steeply inclined groove
- 8 is the bottom of the inclined groove
- 9 is the first chamfered portion.
- the tire having the tread pattern shown in FIG. 1 is located in the vicinity of the pattern center CL in each of the half-sections S and S obtained by dividing the tread portion 1 into two by the pattern center.
- FIG. 1 includes one first side main groove 5 and a plurality of steeply inclined grooves 7 extending between the central main groove 3 and the first side main groove 5 at a relatively small angle with respect to the tire circumferential direction C.
- the central land portion 6 is partitioned by the central main groove 3 and the first lateral main groove 5.
- a rib-like land portion 4 extending continuously in the tire circumferential direction C is formed between the central main groove 3 and the central main groove 3 of the other half section in order to emphasize steering stability.
- the rib-like land portion 4 can be provided as necessary. Therefore, the side main groove 3 may extend on the pattern center CL.
- a plurality of side main grooves may be provided as required.
- the central main groove 3 and the first main groove 3 extending in the tire circumferential direction C are provided in the tread portion 1.
- the side main groove 5 By arranging the side main groove 5, the minimum drainage of the tread contact surface in the front-rear direction necessary for a high-performance tire is ensured, and the tire circumference is between the central main groove 3 and the side main groove.
- a steeply inclined groove 7 that extends at a relatively small angle with respect to direction C, preferably 5 to 50 °, it is mainly responsible for the lateral drainage of water present in the tread surface.
- the central main groove 3 and the first side main groove 5 adjacent to the central main groove 3 define the central land portion 6, and the central main groove 3 and the first side main groove 5 and the tire circumferential direction C
- Two steeply inclined grooves 7 adjacent to the center land portion 6 are made into a row of blocks 15 consisting of a number of substantial blocks 14, thereby ensuring steering stability and drainage. Can do.
- the main structural feature of the present invention is that the steeply inclined groove 7 is provided with an inclined groove bottom 8 in which the groove depth gradually increases from the central main groove 3 toward the first side main groove 5.
- a first chamfered portion 9 whose land height gradually decreases toward the tip of the block 14 sandwiched between the main groove 3 and the steeply inclined groove 7 is provided, and the bottom of the inclined groove 8 The first chamfer 9 is adjacent to the tire width direction W.
- a conventional tire for example, a patent document
- a steeply inclined groove provided in a tread portion is provided with an inclined groove bottom portion in which the groove depth gradually increases toward the first side main groove.
- the steeply inclined groove does not open to the central main groove, it cannot be said that sufficient drainage is obtained although it has excellent steering stability, and it is sandwiched between the central main groove and the steeply inclined groove.
- the conventional tire for example, Patent Document 1) in which the first chamfered portion in which the land height gradually decreases toward the tip of the first acute angle portion of the block to be mounted has good drainage performance and steering stability.
- the inclined groove bottom 8 and the first chamfered portion 9 are adjacent to each other, Since the space (volume) as a groove can be maintained on the tire surface in the vicinity of the main groove 3, drainage can be secured, and the inclined groove bottom 8 and the first chamfered portion 9 can be By adjoining and supporting each other in the inclined groove 7, it is possible to obtain a stable land stability as a result of obtaining a high rigidity against the bending rigidity.
- the steeply inclined groove 7 has an inclined groove bottom portion where the groove depth gradually increases toward the first side main groove 5.
- the adjacent blocks 14 are substantially connected to each other at the bottom 8 of the inclined groove of the central main groove 3 and the rigidity of the central land portion 6 as a whole is increased.
- the length of the inclined groove bottom portion 8 in the steeply inclined groove 7 in the tire circumferential direction C is preferably set, for example, in a range of 10 to 70 mm, and in a range shown by hatching in FIG.
- the length in the tire circumferential direction C of the first chamfered portion 9 is preferably in the range of 2 to 15 mm, and in the range shown by hatching in FIG.
- the chamfer length force of the first chamfered portion 9 is less than 2 mm as measured from the tip 9c, and there is a tendency that the rigidity of the first acute angle portion is not sufficiently obtained.
- the steering stability tends to deteriorate due to the decrease.
- the present invention further makes the inclined groove bottom portion 8 and the first chamfered portion 9 adjacent in the tire width direction W.
- the inclined groove bottom 8 and the first chamfered portion 9 are provided adjacent to each other in the tire width direction W in the center region of the tread so that a large volume as a groove on the tire surface is obtained. As a result, the drainage performance is improved.
- the inclined groove bottom 8 in the steeply inclined groove 7 and the first chamfered part 9 are adjacent to and support each other, so that the bending rigidity against lateral force is improved and the rigidity of the land part of the central land part 6 is further increased. Improves.
- the inclined groove bottom 8 has a starting end 8a in which the groove depth is minimized in the vicinity of the central main groove 3, and from the starting end 8a to the first side.
- An inclined surface 8b in which the groove depth increases linearly toward the main groove 5 and a terminal end 8c having the maximum groove depth are provided.
- the first chamfered portion 9 has a start end 9a having the maximum land height of the block 14 of the central land portion 6, and a straight line from the start end 9a toward the start end 8a side of the inclined groove bottom portion 8.
- it has a chamfered surface 9b where the land height gradually decreases and a tip 9c where the land height is minimized.
- the first chamfered portion 9 has a chamfer length 91 in the tire circumferential direction C of 2 to 15 mm as shown in FIG. 2 (c). It is preferable to contact surface 8b.
- the tip 9c portion may not have sufficient rigidity. If the chamfering length exceeds 15 mm, the ground contact area of the first acute angle portion will be reduced and steering stability will be reduced. This is because it tends to deteriorate.
- the chamfer length of the first chamfered portion 9 is preferably shorter than the extended length of the inclined groove bottom portion 8.
- the inclined groove bottom portion 8 is from the viewpoint of reducing the supporting effect by reducing the portion adjacent to the first chamfered portion 9 if the extension length is too short. More preferably, the chamfer length of the first chamfered portion 9 and the extended length of the inclined groove bottom portion 8 are 1: 1. For example, in FIGS. 5 and 6, if the extended length of the inclined groove bottom 8 exceeds 10 times the chamfer length of the first chamfered portion 9, the groove volume tends to be insufficient and sufficient drainage can be secured. This is because it may become impossible.
- the tip 9c of the first chamfered portion 9 is arranged at the same height position as the inclined groove bottom portion 8. From this, the drainage performance is changed to the steeply inclined groove 7 without disturbing the water flow in the groove. By securing this, good drainage can be secured.
- FIG. 3 is a tread pattern showing another embodiment of the present invention.
- FIG. 4 (a) is a cross-sectional view taken along the line E—E in FIG. 3
- FIG. 4 (b) is a cross-sectional view taken along the line FF in FIG. FIG.
- the central main groove side wall 3b portion of No. 14 projects toward the pattern center CL with a predetermined radius of curvature R, preferably 40 to 400 mm, along the tire circumferential direction C in a development plan view of the tread pattern. It has an arc 20.
- the shape of the arc portion 20 includes not only an arc having a single radius of curvature but also a complex curve in which two or more arcs having different radii of curvature are smoothly continued.
- the central main groove side wall 3b portion of the block 14 has the arc portion 20, the inflow of water in the ground plane from the central main groove 3 to the steeply inclined groove 7 It is possible to improve drainage by guiding smoothly by the arc portion 20 and promoting the inflow thereof.
- the central main groove side wall 3b of the central land portion 6 has a continuous wavy shape as a whole, the water in the central main groove 3 located in the tire contact area is high in the longitudinal direction of the tire. As a result of the ability to drain water with pressure S and the smooth diversion from the central main groove 3 to the steeply inclined groove 7, the drainage performance can be significantly improved. Furthermore, since the groove width of the central main groove 3 continuously changes, air columnar resonance noise can also be reduced.
- the curvature radius is preferably 40 to 400 mm.
- the central main groove 3, the two steeply inclined grooves 7 and the block 14 defined by the first side main groove 5 are connected to the central main groove 3 side from the first side main groove 5.
- a gently inclined groove 11 extending toward the tire is disposed, and more preferably, the angle of the gently inclined groove 11 with respect to the tire circumferential direction C is set to 45 to 135 °.
- Gently inclined groove 1 1 is inclined at a gentler angle than steeply inclined groove 7 so that the block rigidity can be adjusted and the grounding performance of each block 14 can be improved. It is possible to suppress the occurrence, and to improve the steering stability and the uneven wear resistance under sufficient block rigidity.
- the force that ends the gently inclined groove 11 in the block 14 is provided in the block 14 that is long in the tire circumferential direction C.
- the gently inclined groove 11 can be provided as necessary.
- the second acute angle portion of the block 14 sandwiched between the steeply inclined groove 7 and the first lateral main groove 5 has a land portion height toward the tip, as shown in FIG. 4 (a). Providing a second chamfered portion 10 that gradually decreases preferable.
- the steeply inclined groove 7 preferably has an angle with respect to the tire circumferential direction C of 5 to 50 °.
- this angle is less than 5 °, the rigidity of the tip 9c tends to be insufficient, and if it exceeds 50 °, the drainage tends to be insufficient.
- the angle of the gently inclined groove 11 with respect to the tire circumferential direction C is preferably 45 to 135 °.
- the land 14 has sufficient land rigidity with respect to the tire width direction W of the block 14 to improve steering stability and to prevent uneven wear. Can also be improved.
- the angle difference between the steeply inclined groove 7 and the gently inclined groove 11 in the tire circumferential direction C is 10 ° or more in order to exhibit the effects of the steeply inclined groove 7 and the gently inclined groove 11 in a well-balanced manner. Is preferred.
- the block 14 is preferably provided with a sipe 12 extending substantially parallel to the gently inclined groove 11.
- the block 14 is cut with a sipe 12 having substantially the same angle as the gently inclined groove 11, and by reducing the shape difference and area difference of the block 14, the rigidity of the divided part of the block 14 is optimized and uneven wear resistance is achieved. Can be improved.
- the edge component is increased to improve wet brake performance and ride comfort.
- the steeply inclined groove 7 preferably has an extending shape in which the extending angle with respect to the tire circumferential direction C gradually increases from the central main groove 3 side toward the first side main groove 5 side. According to this shape, the water in the tread contact surface can be efficiently drained to the side of the tire by matching the streamline, and good drainage can be ensured.
- the shape of the steeply inclined groove 7 is 5 to 30 with respect to the tire circumferential direction C in the region of about 5 to 10% of the tread width TW from the pattern center CL according to the flow of water in the tread contact surface.
- the short sipe 16 extending in the tire width direction W from the steeply inclined groove 7 with the first side main groove 5 interposed therebetween, and 70 to 90 while being curved with respect to the tire circumferential direction C.
- ° Range corner In place of the 1S sipe 16 that shows the gradual inclination portion 17 extending to the tread end 2 continuously with the short sipe 16, the gentle inclination portion 17 may be opened in the first side main groove 5.
- the inclined groove bottom 8 can have the inclined surface 8b as a flat inclined surface, for example, as shown in FIG.
- Various shapes such as a concave curved surface shown in (a), a convex curved surface shown in FIG. 5 (b), and a three-dimensional structure in which the groove depth of the inclined surface shown in FIG. 5 (c) is different in the width direction can be used.
- the inclined surface 8b has good drainage and little change in performance after wear! /, And in particular, a flat inclined surface is preferable!
- the first chamfered portion 9 can make the chamfered surface 9b a flat inclined surface, for example, FIG.
- Various shapes such as a concave curved surface shown in (a), a convex curved surface shown in FIG. 6 (b), and a three-dimensional structure in which the land height of the chamfered surface shown in FIG. 6 (c) is different in the width direction can be used. .
- the second chamfered portion 10 and the third chamfered portion 13 can be similarly formed in various shapes.
- the first chamfered portion 9 and the second chamfered portion 10 are particularly preferably convex curved surfaces (FIG. 6 (b)) that can form a tread from the tire surface.
- FOG. 6 (b) convex curved surfaces
- the third chamfered portion 13 is preferably a flat inclined surface or a concave curved surface from the viewpoint that a sufficient groove volume can be secured while increasing the rigidity of the base of the block 14.
- FIG. 3 is a diagram showing a straight line running property during running and, in particular, suppressing uneven wear of the tire center part, a circumferential direction extending along the tire circumferential direction C toward the pattern center CL side of the rib-like land part 4. Show the case where the direction narrow groove 18 is provided!
- the tread pattern configured as described above has a force S that is a point-symmetric tread pattern with respect to the pattern center CL, and in the present invention, the tread pattern has line symmetry with respect to the pattern center. It can also be a directional tread pattern.
- the steeply inclined grooves 7 and the gently inclined grooves 11 are alternately arranged.
- the land portion rigidity is ensured by alternately arranging the inclined grooves having different force inclination angles.
- the power S contributes to noise reduction due to the frequency dispersion effect of pattern noise.
- Fig. 1 shows the case where only one side main groove (first side main groove 5) is provided as the side main groove. Force 2 or more side main grooves are provided. I'm sorry.
- the tire of Example 1 has a tread pattern as shown in FIG.
- Tables 1 to 4 summarize the dimensions and other dimensions of the central main groove, side main groove, steeply inclined groove, gently inclined groove, rib-like land, and block.
- the tire structure other than the tread portion does not require modification, the tire structure is almost the same as that of a conventional pneumatic tire for passenger cars.
- the radius of curvature R of one of the wavy parts that form the side wall of the central land in the central land is 165mm (average).
- the tire of Comparative Example 1 has the tread pattern shown in FIG. 7, and has the same configuration as the tire of Example 1 except that the inclined groove bottom and the first chamfered portion are not provided.
- the tire of Comparative Example 2 has the same configuration as the tire of Example 1 except that the inclined groove bottom is not provided.
- the tire of Comparative Example 3 was substantially the same as the tire of Example 1 except that the first chamfered portion was not provided.
- the dry circuit course was sported in various driving modes and evaluated by the test driver feeling.
- the wet circuit course was sported in various driving modes and evaluated with the same feeling as the test driver.
- the vehicle was run in various driving modes on a smooth road surface in a dry state, and evaluated by feelings by a test driver.
- the vehicle was run on dry general roads in various driving modes and evaluated by heel-to-wear between adjacent blocks when driving 5000 km.
- Example Tire 1 is straight ahead of Comparative Example Tire 1 to Comparative Example Tire 3. Excellent drainage performance, dry handling stability, wet handling stability, pattern noise, and uneven wear resistance.
- a tread pattern in which a central main groove and an inclined groove are arranged in the tread portion is adopted, and in such a tread pattern, by optimizing the shape of the block in the central land portion, steering stability and uneven wear resistance are achieved. It has become possible to provide pneumatic tires with improved drainage and noise while maintaining performance such as performance and ride comfort.
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Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020097014945A KR101096990B1 (ko) | 2006-12-20 | 2007-12-14 | 공기입 타이어 |
US12/519,984 US20100089509A1 (en) | 2006-12-20 | 2007-12-14 | pneumatic tire |
BRPI0720395-0A BRPI0720395B1 (pt) | 2006-12-20 | 2007-12-14 | Pneumático |
AU2007335551A AU2007335551B2 (en) | 2006-12-20 | 2007-12-14 | A pneumatic tire |
EP07850657.3A EP2123486B1 (en) | 2006-12-20 | 2007-12-14 | Pneumatic tire |
CN2007800503969A CN101588934B (zh) | 2006-12-20 | 2007-12-14 | 充气轮胎 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006342646A JP4776523B2 (ja) | 2006-12-20 | 2006-12-20 | 空気入りタイヤ |
JP2006-342646 | 2006-12-20 | ||
JP2007011880A JP4869089B2 (ja) | 2007-01-22 | 2007-01-22 | 空気入りタイヤ |
JP2007-011880 | 2007-01-22 |
Publications (1)
Publication Number | Publication Date |
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WO2008075630A1 true WO2008075630A1 (ja) | 2008-06-26 |
Family
ID=39536261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/074153 WO2008075630A1 (ja) | 2006-12-20 | 2007-12-14 | 空気入りタイヤ |
Country Status (8)
Country | Link |
---|---|
US (1) | US20100089509A1 (ja) |
EP (1) | EP2123486B1 (ja) |
KR (1) | KR101096990B1 (ja) |
CN (1) | CN101588934B (ja) |
AU (1) | AU2007335551B2 (ja) |
BR (1) | BRPI0720395B1 (ja) |
RU (1) | RU2408471C1 (ja) |
WO (1) | WO2008075630A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105172478A (zh) * | 2014-06-10 | 2015-12-23 | 住友橡胶工业株式会社 | 充气轮胎 |
Families Citing this family (10)
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---|---|---|---|---|
JP5478284B2 (ja) | 2010-01-29 | 2014-04-23 | 株式会社ブリヂストン | タイヤ |
US9481210B2 (en) * | 2010-02-26 | 2016-11-01 | Bridgestone Corporation | Pneumatic tire |
CN103097149B (zh) * | 2010-08-25 | 2015-11-25 | 株式会社普利司通 | 充气轮胎 |
JP5337201B2 (ja) * | 2011-06-20 | 2013-11-06 | 住友ゴム工業株式会社 | 空気入りタイヤ |
CN103112320B (zh) * | 2013-02-25 | 2016-01-06 | 上海轮胎橡胶(集团)股份有限公司轮胎研究所 | 低噪花纹块 |
JP6364342B2 (ja) * | 2014-12-22 | 2018-07-25 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
US20180015788A1 (en) * | 2015-02-04 | 2018-01-18 | Bridgestone Corporation | Pneumatic tire |
FR3035823A1 (fr) * | 2015-05-07 | 2016-11-11 | Michelin & Cie | Bande de roulement comportant un bloc presentant une pluralite de decoupures |
JP6848641B2 (ja) * | 2017-04-17 | 2021-03-24 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP6762267B2 (ja) * | 2017-06-07 | 2020-09-30 | 株式会社ブリヂストン | タイヤ |
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- 2007-12-14 KR KR1020097014945A patent/KR101096990B1/ko not_active IP Right Cessation
- 2007-12-14 BR BRPI0720395-0A patent/BRPI0720395B1/pt active IP Right Grant
- 2007-12-14 WO PCT/JP2007/074153 patent/WO2008075630A1/ja active Application Filing
- 2007-12-14 EP EP07850657.3A patent/EP2123486B1/en active Active
- 2007-12-14 RU RU2009127778/11A patent/RU2408471C1/ru active
- 2007-12-14 AU AU2007335551A patent/AU2007335551B2/en not_active Ceased
- 2007-12-14 US US12/519,984 patent/US20100089509A1/en not_active Abandoned
- 2007-12-14 CN CN2007800503969A patent/CN101588934B/zh active Active
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CN105172478A (zh) * | 2014-06-10 | 2015-12-23 | 住友橡胶工业株式会社 | 充气轮胎 |
Also Published As
Publication number | Publication date |
---|---|
CN101588934A (zh) | 2009-11-25 |
EP2123486A1 (en) | 2009-11-25 |
CN101588934B (zh) | 2011-06-29 |
KR20090091233A (ko) | 2009-08-26 |
AU2007335551B2 (en) | 2011-04-14 |
US20100089509A1 (en) | 2010-04-15 |
BRPI0720395A2 (pt) | 2014-01-14 |
EP2123486B1 (en) | 2016-07-20 |
AU2007335551A1 (en) | 2008-06-26 |
KR101096990B1 (ko) | 2011-12-20 |
BRPI0720395B1 (pt) | 2019-07-16 |
EP2123486A4 (en) | 2011-08-24 |
RU2408471C1 (ru) | 2011-01-10 |
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