WO2014010349A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2014010349A1 WO2014010349A1 PCT/JP2013/065843 JP2013065843W WO2014010349A1 WO 2014010349 A1 WO2014010349 A1 WO 2014010349A1 JP 2013065843 W JP2013065843 W JP 2013065843W WO 2014010349 A1 WO2014010349 A1 WO 2014010349A1
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- WIPO (PCT)
- Prior art keywords
- belt
- tire
- layer
- pneumatic tire
- reinforcing layer
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/28—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by the belt or breaker dimensions or curvature relative to carcass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/0083—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the curvature of the tyre tread
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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
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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
- B60C11/13—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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/1835—Rubber strips or cushions at the belt edges
- B60C9/185—Rubber strips or cushions at the belt edges between adjacent or radially below the belt plies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2006—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords consisting of steel cord plies only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2016—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 10 to 30 degrees to the circumferential 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2019—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 30 to 60 degrees to the circumferential 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2022—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 60 to 90 degrees to the circumferential 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2041—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with an interrupted belt ply, e.g. using two or more portions of the same ply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2061—Physical properties or dimensions of the belt coating rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2061—Physical properties or dimensions of the belt coating rubber
- B60C2009/2064—Modulus; Hardness; Loss modulus or "tangens delta"
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2077—Diameters of the cords; Linear density thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2083—Density in width 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/28—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by the belt or breaker dimensions or curvature relative to carcass
- B60C2009/283—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by the belt or breaker dimensions or curvature relative to carcass characterised by belt curvature
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10765—Characterized by belt or breaker structure
- Y10T152/10801—Structure made up of two or more sets of plies wherein the reinforcing cords in one set lie in a different angular position relative to those in other sets
Definitions
- the present invention relates to a pneumatic tire, and more particularly to a pneumatic tire capable of improving the belt durability performance of the tire.
- the present invention has been made in view of the above, and an object thereof is to provide a pneumatic tire capable of improving the belt durability performance of the tire in a configuration having a circumferential reinforcing layer.
- a pneumatic tire according to the present invention includes a carcass layer, a belt layer disposed on the outer side in the tire radial direction of the carcass layer, and a tread rubber disposed on the outer side in the tire radial direction of the belt layer.
- a pneumatic tire including at least three circumferential main grooves extending in the tire circumferential direction and a plurality of land portions defined by the circumferential main grooves, the belt layer An inner diameter side crossing belt and an outer diameter side crossing belt having belt angles of 51 [deg] or more and 80 [deg] or less in absolute value with respect to the tire circumferential direction, and belt angles having mutually different signs, And a circumferential reinforcing layer having a belt angle within a range of ⁇ 5 [deg] with respect to the direction.
- the pair of intersecting belts functions as a high-angle belt, and the rigidity in the tire width direction is ensured.
- the circumferential reinforcing layer functions as a low-angle belt, and the rigidity in the tire circumferential direction is ensured.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is an explanatory view showing a belt layer of the pneumatic tire shown in FIG.
- FIG. 3 is an explanatory view showing a belt layer of the pneumatic tire shown in FIG. 1.
- FIG. 4 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 5 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 6 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1.
- FIG. 7 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- FIG. 8 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- FIG. 9 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- FIG. 1 shows a heavy-duty radial tire mounted on a truck, a bus, etc. for long-distance transportation.
- Reference sign CL is a tire equator plane.
- the tread end P and the tire ground contact end T coincide.
- the circumferential reinforcing layer 145 is hatched.
- the pneumatic tire 1 includes a pair of bead cores 11, 11, a pair of bead fillers 12, 12, a carcass layer 13, a belt layer 14, a tread rubber 15, and a pair of sidewall rubbers 16, 16. (See FIG. 1).
- the pair of bead cores 11 and 11 has an annular structure and constitutes the core of the left and right bead portions.
- the pair of bead fillers 12 and 12 includes a lower filler 121 and an upper filler 122, which are disposed on the tire radial direction outer periphery of the pair of bead cores 11 and 11, respectively, to reinforce the bead portion.
- the carcass layer 13 is bridged in a toroidal shape between the left and right bead cores 11 and 11 to form a tire skeleton. Further, both ends of the carcass layer 13 are wound and locked from the inner side in the tire width direction to the outer side in the tire width direction so as to wrap the bead core 11 and the bead filler 12.
- the carcass layer 13 is formed by coating a plurality of carcass cords made of steel or an organic fiber material (for example, nylon, polyester, rayon, etc.) with a coating rubber and rolling them, and has an absolute value of 85 [deg] or more and 95. [Deg] The following carcass angle (inclination angle in the fiber direction of the carcass cord with respect to the tire circumferential direction).
- the belt layer 14 is formed by laminating a plurality of belt plies 142, 143, 144, and 145, and is arranged around the outer periphery of the carcass layer 13. A specific configuration of the belt layer 14 will be described later.
- the tread rubber 15 is disposed on the outer circumference in the tire radial direction of the carcass layer 13 and the belt layer 14 to constitute a tread portion of the tire.
- the pair of side wall rubbers 16 and 16 are respectively arranged on the outer side in the tire width direction of the carcass layer 13 to constitute left and right side wall portions.
- the pneumatic tire 1 includes seven circumferential main grooves 2 extending in the tire circumferential direction and eight land portions 3 that are partitioned by these circumferential main grooves 2. I have.
- each land portion 3 is a row of blocks that are divided in the tire circumferential direction by ribs that are continuous in the tire circumferential direction or by a plurality of lug grooves (not shown).
- the circumferential main groove refers to a circumferential groove having a groove width of 5.0 [mm] or more.
- the groove width of the circumferential main groove is measured excluding notches and chamfers formed in the groove openings.
- the left and right circumferential main grooves 2 and 2 on the outermost side in the tire width direction are called outermost circumferential main grooves.
- the left and right land portions 3 and 3 on the outer side in the tire width direction defined by the left and right outermost circumferential main grooves 2 and 2 are referred to as shoulder land portions.
- FIG. 2 and 3 are explanatory views showing a belt layer of the pneumatic tire shown in FIG.
- FIG. 2 shows one side region of the tread portion with the tire equatorial plane CL as a boundary
- FIG. 3 shows a laminated structure of the belt layer 14.
- the thin lines in the belt plies 142 to 145 schematically show the belt cords of the belt plies 142 to 145.
- the belt layer 14 is formed by laminating a pair of cross belts 142 and 143, an additional belt (low angle belt) 144, and a circumferential reinforcing layer 145, and is arranged around the outer periphery of the carcass layer 13 ( (See FIG. 2).
- the pair of cross belts 142 and 143 are configured by rolling a plurality of belt cords made of steel or organic fiber material coated with a coat rubber.
- the pair of cross belts 142 and 143 preferably have a belt angle (inclination angle in the fiber direction of the belt cord with respect to the tire circumferential direction) of 51 [deg] or more and 80 [deg] or less in absolute value, and 51 [deg More preferably, the belt angle is 70 [deg] or less.
- the pair of cross belts 142 and 143 have belt angles with different signs from each other, and are laminated so that the fiber directions of the belt cords cross each other (cross-ply structure).
- the cross belt 142 located on the inner side in the tire radial direction is called an inner diameter side cross belt
- the cross belt 143 located on the outer side in the tire radial direction is called an outer diameter side cross belt.
- three or more cross belts may be laminated (not shown).
- the additional belt 144 is configured by rolling a plurality of belt cords made of steel or organic fiber material with a coat rubber.
- the additional belt 144 preferably has a belt angle of 10 [deg] or more and 45 [deg] or less in absolute value, and more preferably has a belt angle of 15 [deg] or more and 30 [deg] or less.
- the additional belt 144 is disposed so as to be laminated on the outer side in the tire radial direction of the pair of cross belts 142 and 143. In the configuration of FIG. 1, the additional belt 144 is stacked on the outermost side in the tire radial direction and also serves as a belt cover for the outer diameter side crossing belt 143.
- the circumferential reinforcing layer 145 is formed by winding a steel belt cord covered with a coat rubber in a spiral manner while inclining within a range of ⁇ 5 [deg] with respect to the tire circumferential direction. Specifically, one or more wires are spirally wound around the outer circumference of the inner diameter side crossing belt 142 to form the circumferential reinforcing layer 145. Further, the circumferential reinforcing layer 145 is disposed between the pair of cross belts 142 and 143. Further, the circumferential reinforcing layer 145 is disposed on the inner side in the tire width direction with respect to the left and right edge portions of the pair of cross belts 142 and 143. The circumferential reinforcing layer 145 reinforces the rigidity in the tire circumferential direction.
- the belt layer 14 may have an edge cover (not shown).
- the edge cover is formed by rolling a plurality of belt cords made of steel or organic fiber material with a coating rubber, and has an absolute value of a belt angle of 0 [deg] or more and 5 [deg] or less.
- the edge covers are respectively disposed on the outer sides in the tire radial direction of the left and right edge portions of the outer diameter side cross belt 143 (or the inner diameter side cross belt 142). These edge covers exhibit a tagging effect, so that the difference in diameter growth between the tread portion center region and the shoulder region is alleviated.
- the inner diameter side crossing belt 142 is disposed adjacent to the carcass layer 13. Therefore, the inner diameter side cross belt 142 constitutes the innermost layer in the tire radial direction of the belt layer 14, and no other belt ply is disposed between the inner diameter side cross belt 142 and the carcass layer 13.
- the inner diameter side crossing belt 142 and the outer diameter side crossing belt 143 are adjacent to the circumferential direction reinforcing layer 145 with the circumferential direction reinforcing layer 145 interposed therebetween. Therefore, no other belt ply is disposed between the inner diameter side cross belt 142 and the outer diameter side cross belt 143 and the circumferential reinforcing layer 145.
- the circumferential reinforcing layer 145 is disposed between the pair of cross belts 142 and 143 (see FIG. 2).
- the present invention is not limited to this, and the circumferential reinforcing layer 145 may be disposed on the outer side in the tire radial direction of the pair of cross belts 142 and 143 (not shown). Further, the circumferential reinforcing layer 145 may be disposed inside the pair of cross belts 142 and 143.
- the additional belt 144 and the outer diameter side crossing belt 143 that are adjacent to each other have the same belt angle (see FIG. 3).
- the belt cord of the additional belt 144 is inclined leftward in the lower part of the figure, and the belt cord of the outer diameter side crossing belt 143 is inclined rightward in the lower part of the figure. ing.
- the belt cord of the additional belt 144 and the belt cord of the outer diameter side crossing belt 143 are inclined in opposite directions to have belt angles with different signs.
- the belt cord of the additional belt 144 and the belt cord of the outer diameter side crossing belt 143 may have the same belt angle (not shown) by inclining in the same direction.
- the additional belt 144 is arranged so as to cover the arrangement area of the outermost circumferential main groove 2 (see FIG. 2). Specifically, the additional belt 144 is disposed over the entire groove width of the outermost circumferential main groove 2. Thereby, the groove bottom of the outermost circumferential main groove 2 is reinforced. When the additional belt 144 has a split structure (not shown), each divided portion of the additional belt 144 is disposed so as to cover the entire width of the outermost circumferential main groove 2.
- the width Wb4 of the additional belt 144 and the width Wb3 of the outer diameter side crossing belt 143 have a relationship of 0.75 ⁇ Wb4 / Wb3 ⁇ 0.95 (see FIG. 3). Therefore, the additional belt 144 is narrower than the outer diameter side crossing belt 143.
- the ratio Wb4 / Wb3 preferably has a relationship of 0.80 ⁇ Wb4 / Wb3 ⁇ 0.90.
- the width Wb4 of the additional belt 144 and the width Ws of the circumferential reinforcing layer 145 have a relationship of 1.02 ⁇ Wb4 / Ws (see FIG. 3). Therefore, the additional belt 144 is wider than the circumferential reinforcing layer 145. Further, it is preferable that the additional belt 144 extends to the outer side in the tire width direction than the outermost circumferential main groove 2 (see FIG. 2).
- the upper limit of the ratio Wb4 / Ws is not particularly limited, but is limited by the relationship between the ratio Wb4 / Wb3 and the later-described ratio Ws / Wb3.
- the width of the belt ply is a distance in the tire rotation axis direction between the left and right ends of each belt ply, and is measured while a tire is mounted on a specified rim and a specified internal pressure is applied and no load is applied.
- the width of the belt ply is measured as the distance between the outer sides in the tire width direction of the left and right divided portions.
- each belt ply has a symmetrical structure with the tire equatorial plane CL as the center. For this reason, the distance from the tire equatorial plane CL to the end of the belt ply on the outer side in the tire width direction is the half width of the belt ply.
- the stipulated rim is an “applicable rim” defined in JATMA, a “Design Rim” defined in TRA, or a “Measuring Rim” defined in ETRTO.
- the specified internal pressure refers to the “maximum air pressure” specified by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” specified by TRA, or “INFLATION PRESSURES” specified by ETRTO.
- the specified load is the “maximum load capacity” specified in JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” specified in TRA, or “LOAD CAPACITY” specified in ETRTO.
- the specified internal pressure is air pressure 180 [kPa]
- the specified load is 88 [%] of the maximum load capacity.
- the belt cord of the additional belt 144 is a steel wire and has an end number of 15 [lines / 50 mm] or more and 25 [lines / 50 mm] or less.
- the rigidity in the tire circumferential direction of the belt layer is increased by the circumferential reinforcing layer, so that the rigidity in the tire width direction is relatively lowered. Then, there is a problem that the rigidity balance between the tire circumferential direction and the tire width direction becomes non-uniform, and the belt durability performance of the tire decreases. Such a problem remarkably appears particularly under long-term use conditions with a high internal pressure and a high load.
- the pair of cross belts 142 and 143 function as a high-angle belt, and rigidity in the tire width direction is ensured.
- the circumferential reinforcing layer 145 and the additional belt 144 function as a low-angle belt, and the rigidity in the tire circumferential direction is ensured.
- the distance Gcc from the tread profile to the tire inner peripheral surface on the tire equatorial plane CL and the distance Gsh from the tread end P to the tire inner peripheral surface are 0.80 ⁇ Gsh / Gcc ⁇ 1.20 relationship.
- the ratio Gsh / Gcc preferably has a relationship of 0.85 ⁇ Gsh / Gcc ⁇ 1.10.
- the distance Gcc is measured as a distance from the intersection of the tire equator plane CL and the tread profile to the intersection of the tire equator plane CL and the tire inner peripheral surface in a sectional view in the tire meridian direction. Therefore, in the configuration having the circumferential main groove 2 on the tire equatorial plane CL as in the configuration of FIGS. 1 and 2, the distance Gcc is measured excluding the circumferential main groove 2.
- the distance Gsh is measured as the length of a perpendicular line dropped from the tread end P to the tire inner peripheral surface in a sectional view in the tire meridian direction.
- the pneumatic tire 1 includes an inner liner 18 on the inner peripheral surface of the carcass layer 13, and the inner liner 18 is arranged over the entire inner peripheral surface of the tire.
- the distance Gcc and the distance Gsh are measured using the surface of the inner liner 18 as a reference (tire inner peripheral surface).
- the end wear surface WE of the circumferential main groove 2 is drawn in a sectional view in the tire meridian direction.
- the end wear surface WE is a surface estimated from a wear index existing in the tire. Further, the end wear surface WE is measured in a state of the tire alone with the tire in a non-inflated state. In a general pneumatic tire, the end wear surface WE is on a curve substantially parallel to the tread profile.
- the distance Dcc from the circumferential reinforcing layer 145 to the terminal wear surface WE on the tire equatorial plane CL and the distance De from the end of the circumferential reinforcing layer 145 to the terminal wear surface WE are 0.95 ⁇ De /Dcc ⁇ 1.05.
- the distance Dcc and the distance De are measured in a state of the tire alone with the tire in a non-inflated state. Further, the measurement point on the circumferential reinforcing layer 145 side is defined by a curve connecting the center points of the belt cords constituting the circumferential reinforcing layer 145 in a sectional view in the tire meridian direction. The end of the circumferential reinforcing layer 145 is defined with reference to the outermost belt cord in the tire width direction among the belt cords constituting the circumferential reinforcing layer 145.
- FIG. 4 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1. This figure shows a configuration having a round shoulder.
- the shoulder portion has a square shape, and the tire ground contact end T and the tread end P coincide with each other. That is, in the configuration having the square-shaped shoulder portion, the point of the square-shaped edge portion becomes the tread end P.
- the shoulder portion may have a round shape as shown in FIG.
- the intersection P ′ between the profile of the tread portion and the profile of the sidewall portion is taken, and the perpendicular foot drawn from the intersection P ′ to the shoulder portion. Is the tread edge P. For this reason, normally, the tire ground contact edge T and the tread edge P are in different positions.
- the tread width TW and the tire total width SW have a relationship of 0.83 ⁇ TW / SW ⁇ 0.95. Further, the ratio TW / SW is preferably in the range of 0.85 ⁇ TW / SW ⁇ 0.93.
- the total tire width SW is the linear distance between the sidewalls (including all parts of the tire side pattern, characters, etc.) when the tire is mounted on the specified rim to provide the specified internal pressure and is in an unloaded state.
- the tread width TW is the distance between the left and right tread ends P, P in the tire rotation axis direction, and is measured as a no-load state while attaching a tire to a specified rim and applying a specified internal pressure.
- tread width TW and the cross-sectional width Wca of the carcass layer 13 have a relationship of 0.82 ⁇ TW / Wca ⁇ 0.92.
- the cross-sectional width Wca of the carcass layer 13 refers to a linear distance between the left and right maximum width positions of the carcass layer 13 when a tire is mounted on a specified rim to apply a specified internal pressure and is in an unloaded state.
- the diameter Ya of the maximum height position of the carcass layer 13 and the diameter Yc of the maximum width position of the carcass layer 13 have a relationship of 0.80 ⁇ Yc / Ya ⁇ 0.90. Further, the diameter Ya at the maximum height position of the carcass layer 13 and the diameter Yd of the carcass layer 13 at the end position of the circumferential reinforcing layer 145 have a relationship of 0.95 ⁇ Yd / Ya ⁇ 1.02. As a result, the cross-sectional shape of the carcass layer 13 is optimized and the contact pressure distribution of the tire is made uniform.
- the diameter Ya of the maximum height position of the carcass layer 13 is the intersection of the tire equatorial plane CL and the carcass layer 13 from the tire rotation axis when the tire is mounted on the specified rim to apply the specified internal pressure and is in an unloaded state. Measured as distance to.
- the diameter Yc at the maximum width position of the carcass layer 13 is measured as the distance from the tire rotation axis to the maximum width position of the carcass layer 13 when the tire is mounted on a specified rim to apply a specified internal pressure and is in an unloaded state. Is done.
- the diameter Yd of the carcass layer 13 at the end position of the circumferential reinforcing layer 145 is defined as a point Q3 (not shown) at the intersection of the straight line drawn in the tire radial direction from the end of the circumferential reinforcing layer 145 and the carcass layer 13. It is measured as the distance from the tire rotation axis to the point Q3 when the tire is mounted on the specified rim to apply the specified internal pressure and is in a no-load state.
- the width Wb3 of the narrower cross belt in FIG. 1, the outer diameter side cross belt 143 and the width Ws of the circumferential reinforcing layer 145 among the inner diameter side cross belt 142 and the outer diameter side cross belt 143.
- the width Ws of the circumferential reinforcing layer 145 is appropriately secured.
- the widths Wb2 and Wb3 of the cross belts 142 and 143 are the distances in the tire rotation axis direction of the left and right ends of the cross belts 142 and 143. As measured.
- the width Wb2 of the wide cross belt in FIG. 1, the inner diameter side cross belt 142) of the inner diameter side cross belt 142 and the outer diameter side cross belt 143, and the cross-sectional width Wca of the carcass layer 13
- the ratio Wb2 / Wca is preferably in the range of 0.78 ⁇ Wb2 / Wca ⁇ 0.83.
- width Ws of the circumferential reinforcing layer 145 and the cross-sectional width Wca of the carcass layer 13 have a relationship of 0.60 ⁇ Ws / Wca ⁇ 0.70.
- the tread width TW and the width Ws of the circumferential reinforcing layer 145 have a relationship of 0.70 ⁇ Ws / TW ⁇ 0.90.
- the circumferential reinforcing layer 145 has a narrow cross belt (in FIG. 1, the outer diameter side cross) in the pair of cross belts (the inner diameter side cross belt 142 and the outer diameter side cross belt 143).
- the belt 143) is disposed on the inner side in the tire width direction than the left and right edge portions.
- the width Wb3 of the narrow cross belt 143 and the distance S from the edge portion of the circumferential reinforcing layer 145 to the edge portion of the narrow cross belt 143 satisfy 0.03 ⁇ S / Wb3 ⁇ 0.12. It is preferable to be in the range.
- the distance S of the circumferential reinforcing layer 145 is measured as a distance in the tire width direction when the tire is mounted on a specified rim to apply a specified internal pressure and is in a no-load state.
- the circumferential reinforcing layer 145 is formed by winding a single steel wire in a spiral shape.
- the present invention is not limited to this, and the circumferential reinforcing layer 145 may be formed by spirally winding a plurality of wires while running parallel to each other (multiple winding structure).
- the number of wires is preferably 5 or less.
- the winding width per unit when multiple windings of five wires are 12 [mm] or less. Thereby, a plurality of wires (2 or more and 5 or less) can be properly wound while being inclined within a range of ⁇ 5 [deg] with respect to the tire circumferential direction.
- the belt cords of the pair of cross belts 142 and 143 are preferably steel wires, and the pair of cross belts 142 and 143 preferably have an end number of 18 [lines / 50 mm] or more and 28 [lines / 50 mm] or less. It is more preferable to have an end number of [lines / 50 mm] or more and 25 [lines / 50 mm] or less.
- the belt cord of the circumferential reinforcing layer 145 is preferably a steel wire and has an end number of 17 [pieces / 50 mm] or more and 30 [pieces / 50 mm] or less. Thereby, the strength of each belt ply 142, 143, 145 is ensured appropriately.
- the modulus E2 and E3 when the coat rubber of the pair of cross belts 142 and 143 is 100% stretched and the modulus Es when the coat rubber of the circumferential reinforcing layer 145 is 100% stretched are 0.90 ⁇ Es / E2 ⁇ 1.10. And it is preferable to have a relationship of 0.90 ⁇ Es / E3 ⁇ 1.10.
- the modulus Es when the coated rubber of the circumferential reinforcing layer 145 is 100% stretched is preferably in the range of 4.5 [MPa] ⁇ Es ⁇ 7.5 [MPa]. Thereby, the modulus of each belt ply 142, 143, 145 is optimized.
- the modulus at 100% elongation is measured by a tensile test at room temperature according to JIS-K6251 (using No. 3 dumbbell).
- the breaking elongations ⁇ 2 and ⁇ 3 of the coat rubber of the pair of cross belts 142 and 143 are in the range of ⁇ 2 ⁇ 200 [%] and ⁇ 3 ⁇ 200 [%].
- the elongation at break ⁇ s of the coated rubber of the circumferential reinforcing layer 145 is preferably in the range of ⁇ s ⁇ 200 [%].
- Elongation at break is 2 [mm] using a tensile tester (INSTRON 5585H, manufactured by Instron) in accordance with JIS-K7161 for test pieces of JIS-K7162 standard type 1B (dumbbell type with a thickness of 3 mm). / Min].
- the elongation at a tensile load of 100 [N] to 300 [N] is 1.0 [%] or more and 2.5 [%] or less.
- the elongation at a tensile load of 500 [N] to 1000 [N] is preferably 0.5 [%] or more and 2.0 [%] or less.
- Such a belt cord (high elongation steel wire) has a better elongation at low load than normal steel wire, and can withstand the load applied to the circumferential reinforcing layer 145 from the time of manufacture to the time of tire use. This is preferable in that damage to the circumferential reinforcing layer 145 can be suppressed.
- the elongation of the belt cord is measured according to JIS-G3510.
- the breaking elongation of the tread rubber 15 is preferably in the range of 400 [%] or more, and more preferably 450 [%] or more. Thereby, the strength of the tread rubber 15 is ensured.
- the upper limit of the elongation at break of the tread rubber 15 is not particularly limited, but is restricted by the type of rubber compound of the tread rubber 15.
- the tread rubber 15 preferably has a hardness of 60 or more. Thereby, the strength of the tread rubber 15 is ensured appropriately.
- the upper limit of the hardness of the tread rubber 15 is not particularly limited, but is restricted by the type of rubber compound of the tread rubber 15.
- Rubber hardness means JIS-A hardness according to JIS-K6263.
- the pneumatic tire 1 includes a belt cushion 20.
- the belt cushion 20 is disposed so as to be sandwiched between the end of the cross belt 142 on the inner side in the tire radial direction of the pair of cross belts 142 and 143 and the carcass layer 13.
- the belt cushion 20 is inserted between the end of the cross belt 142 and the carcass layer 13 at the end in the tire radial direction.
- the belt cushion 20 extends along the carcass layer 13 in the tire radial direction, and is sandwiched between the carcass layer 13 and the sidewall rubber 16.
- a pair of left and right belt cushions 20 are respectively disposed on the left and right sidewall portions of the tire.
- the modulus Ebc at the time of 100% extension of the belt cushion 20 is in the range of 1.5 [MPa] ⁇ Ebc ⁇ 3.0 [MPa].
- the modulus Ebc of the belt cushion 20 is within such a range, the belt cushion 20 exhibits a stress relaxation action, and the separation of the peripheral rubber at the end of the cross belt 142 is suppressed.
- the breaking elongation ⁇ bc of the belt cushion 20 is in the range of ⁇ bc ⁇ 400 [%]. Thereby, durability of the belt cushion 20 is ensured appropriately.
- FIG. 5 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1. This figure shows an enlarged view of the end of the belt layer 14 on the outer side in the tire width direction. In the same figure, the circumferential reinforcing layer 145 and the belt edge cushion 19 are hatched.
- the circumferential reinforcing layer 145 is disposed on the inner side in the tire width direction from the left and right edge portions of the narrow cross belt 143 of the pair of cross belts 142 and 143. Further, the belt edge cushion 19 is sandwiched and disposed at a position between the pair of cross belts 142 and 143 and corresponding to the edge portions of the pair of cross belts 142 and 143. Specifically, the belt edge cushion 19 is disposed on the outer side in the tire width direction of the circumferential reinforcing layer 145 and is adjacent to the circumferential reinforcing layer 145, and a pair of ends from the outer end of the circumferential reinforcing layer 145 in the tire width direction.
- the cross belts 142 and 143 are arranged so as to extend to the outer ends in the tire width direction.
- the belt edge cushion 19 has a structure thicker than the circumferential reinforcing layer 145 as a whole by increasing the thickness toward the outer side in the tire width direction. .
- the belt edge cushion 19 has a modulus E at 100% extension lower than the coat rubber of each cross belt 142, 143.
- the modulus E at 100% extension of the belt edge cushion 19 and the modulus Eco of the coat rubber have a relationship of 0.60 ⁇ E / Eco ⁇ 0.95.
- the belt edge cushion 19 has a two-color structure including a stress relaxation rubber 191 and an end relaxation rubber 192 in the configuration of FIG.
- the stress relaxation rubber 191 is disposed between the pair of cross belts 142 and 143 and outside the circumferential reinforcing layer 145 in the tire width direction and is adjacent to the circumferential reinforcing layer 145.
- the end relaxation rubber 192 is disposed between the pair of cross belts 142 and 143, and is disposed on the outer side in the tire width direction of the stress relaxation rubber 191 and at a position corresponding to the edge portion of the pair of cross belts 142 and 143. Adjacent to rubber 191.
- the belt edge cushion 19 has a structure in which the stress relaxation rubber 191 and the end relaxation rubber 192 are continuously provided in the tire width direction in the tire meridian cross-sectional view, and the tire of the circumferential reinforcing layer 145 The region from the end portion on the outer side in the width direction to the edge portion of the pair of cross belts 142 and 143 is filled in.
- the modulus Ein when the stress relaxation rubber 191 is stretched 100% and the modulus Es when the coat rubber of the circumferential reinforcing layer 145 is stretched 100% have a relationship of Ein ⁇ Es.
- the modulus Ein of the stress relaxation rubber 191 and the modulus Es of the circumferential reinforcing layer 145 have a relationship of 0.6 ⁇ Ein / Es ⁇ 0.9.
- the modulus Ein when the stress relaxation rubber 191 is stretched 100% and the modulus Eco when the coat rubber of each cross belt 142 and 143 is stretched 100% have a relationship of Ein ⁇ Eco.
- the modulus Ein of the stress relaxation rubber 191 and the modulus Eco of the coat rubber have a relationship of 0.6 ⁇ Ein / Eco ⁇ 0.9.
- the modulus Eout at 100% extension of the end relaxation rubber 192 and the modulus Ein at 100% extension of the stress relaxation rubber 191 have a relationship of Eout ⁇ Ein.
- the modulus Ein at 100% elongation of the stress relaxation rubber 191 is preferably in the range of 4.0 [MPa] ⁇ Ein ⁇ 5.5 [MPa].
- FIG. 6 is an explanatory view showing a modified example of the pneumatic tire shown in FIG. 1. This figure shows one side region of the tread portion with the tire equatorial plane CL as a boundary.
- the additional belt 144 is installed in the outermost layer of the belt layer 14 as shown in FIGS. 2 and 3. For this reason, the inner diameter side crossing belt 142 is disposed in the innermost layer of the belt layer 14 and is adjacent to the carcass layer 13.
- the additional belt 144 may be sandwiched between the carcass layer 13 and the inner diameter side crossing belt 142 and disposed adjacent to them. That is, in the configuration of FIG. 6, the additional belt 144 is disposed on the outer periphery of the carcass layer 13, the inner diameter side cross belt 142 is laminated on the outer periphery of the additional belt 144, and the circumferential reinforcing layer is disposed on the outer periphery of the inner diameter side cross belt 142. 145 and the outer diameter side crossing belt 143 are laminated in order to constitute the belt layer 14.
- the pneumatic tire 1 includes the carcass layer 13, the belt layer 14 disposed outside the carcass layer 13 in the tire radial direction, and the tread rubber 15 disposed outside the belt layer 14 in the tire radial direction. (See FIG. 1).
- at least three circumferential main grooves 2 extending in the tire circumferential direction and a plurality of land portions 3 defined by the circumferential main grooves 2 are provided.
- the belt layer 14 has a belt angle of 51 [deg] or more and 80 [deg] or less as an absolute value with respect to the tire circumferential direction, and an inner diameter side cross belt 142 and an outer diameter side having mutually different belt angles
- a cross belt 143 and a circumferential reinforcing layer 145 having a belt angle within a range of ⁇ 5 [deg] with respect to the tire circumferential direction are provided (see FIGS. 2 and 3).
- the pair of cross belts 142 and 143 function as a high-angle belt, and the rigidity in the tire width direction is ensured.
- the circumferential reinforcing layer 145 functions as a low-angle belt, and the rigidity in the tire circumferential direction is ensured.
- the pair of cross belts 142 and 143 function as high-angle belts, and therefore, other high-angle belts (for example, belt angles of 45 [deg] or more and 70 [deg] or less in absolute value).
- the belt ply disposed between the carcass layer and the inner diameter side cross belt can be omitted.
- the circumferential reinforcing layer 145 is disposed between the inner diameter side cross belt 142 and the outer diameter side cross belt 143 (see FIGS. 2 and 3).
- a pair of cross belts 142 and 143 having a belt angle greatly inclined in the tire width direction and a circumferential reinforcing layer 145 having a belt angle greatly inclined in the tire circumferential direction are alternately laminated in the tire radial direction.
- the tire diameter between the belt plies 142, 143, and 145 is compared with a configuration (not shown) in which the circumferential reinforcing layer is disposed on the tire radial direction inner side or the tire radial direction outer side of the pair of cross belts. Uniform stiffness distribution in the direction. Thereby, there exists an advantage which the belt durability of a tire improves.
- the distance Gcc from the tread profile to the tire inner peripheral surface on the tire equatorial plane CL and the distance Gsh from the tread end P to the tire inner peripheral surface satisfy Gsh / Gcc ⁇ 1.20.
- Gsh / Gcc ⁇ 1.20 there is a relationship (see FIG. 2).
- the distance Gsh by setting the distance Gsh to be small, there is an advantage that the rubber volume at the end portions of the cross belts 142 and 143 is reduced and heat generation is improved.
- the distance Dcc from the circumferential reinforcing layer 145 to the terminal wear surface WE on the tire equatorial plane CL and the distance De from the end of the circumferential reinforcing layer 145 to the terminal wear surface WE are as follows. 0.95 ⁇ De / Dcc ⁇ 1.05.
- the distances Dcc and De of the circumferential reinforcing layer 145 with respect to the terminal wear surface WE are optimized, distortion of the circumferential reinforcing layer 145 at the time of tire contact is reduced. Thereby, there exists an advantage which belt durability improves.
- the width Wb2 of the wide cross belt in FIG. 1, the inner diameter side cross belt 142) and the cross-sectional width Wca of the carcass layer 13 among the inner diameter side cross belt 142 and the outer diameter side cross belt 143
- ratio Wb2 / Wca is optimized. That is, by satisfying 0.74 ⁇ Wb2, the width Wb2 of the wide cross belt is secured, and the rigidity in the tire circumferential direction is secured. Further, since Wb2 / Wca ⁇ 0.89, the rigidity in the tire circumferential direction is prevented from becoming excessive.
- the width Ws of the circumferential reinforcing layer 145 and the width Wca of the carcass layer 13 have a relationship of 0.60 ⁇ Ws / Wca ⁇ 0.70 (see FIG. 1).
- ratio Ws / Wca is optimized. That is, by satisfying 0.60 ⁇ Ws / Wca, the width Ws of the circumferential reinforcing layer 145 is secured, and the tread portion in the vicinity of the end of the circumferential reinforcing layer 145 (a region of 1 ⁇ 4 of the tread width TW) is secured. The rising is suppressed, and the contact surface pressure of the shoulder land portion 3 is appropriately secured.
- the difference in diameter between the central portion and the end portion of the circumferential reinforcing layer 145 is alleviated, and the circumferential reinforcing layer 145 caused by repeated strain at the time of tire rolling is reduced.
- the tension is reduced, and fatigue breakage of the belt cord at the edge portion of the circumferential reinforcing layer 145 is suppressed.
- the tread width TW and the tire total width SW have a relationship of 0.83 ⁇ TW / SW ⁇ 0.95 (see FIG. 1).
- the diameter Ya of the maximum height position of the carcass layer 13 and the diameter Yd of the carcass layer 13 at the end position of the circumferential reinforcing layer 145 are 0.95 ⁇ Yd / Ya ⁇ 1. .02 (see FIG. 1).
- the breaking elongation ⁇ s of the coated rubber of the circumferential reinforcing layer 145 is in the range of ⁇ s ⁇ 200 [%].
- the breaking elongations ⁇ 2 and ⁇ 3 of the coated rubber of the inner diameter side cross belt 142 and the outer diameter side cross belt 143 are in the range of ⁇ 2 ⁇ 200 [%] and ⁇ 3 ⁇ 200 [%]. Accordingly, there is an advantage that the breaking elongations ⁇ 2 and ⁇ 3 of the pair of cross belts 142 and 143 are optimized, and the threshold value for tire failure is improved.
- the pneumatic tire 1 includes a belt cushion 20 that is sandwiched and disposed between an end portion of the cross belt 142 on the inner side in the tire radial direction of the pair of cross belts 142 and 143 and the carcass layer 13. (See FIGS. 1 and 2). Further, the modulus Ebc at the time of 100% extension of the belt cushion 20 is in the range of 1.5 [MPa] ⁇ Ebc ⁇ 3.0 [MPa]. In such a configuration, the belt cushion 20 is disposed between the cross belt 142 and the carcass layer 13 on the inner side in the tire radial direction, and the modulus Ebc of the belt cushion 20 is optimized.
- the belt cushion 20 exhibits a stress relaxation action and the separation of the peripheral rubber at the end portion of the cross belt 142 is suppressed. Specifically, when 1.5 [MPa] ⁇ Ebc, the durability of the belt cushion 20 is ensured appropriately, and when Ebc ⁇ 3.0 [MPa], the stress of the belt cushion 20 Mitigating action is ensured properly.
- the elongation at break ⁇ bc of the belt cushion 20 is in the range of ⁇ bc ⁇ 400 [%].
- the tread width TW and the cross-sectional width Wca of the carcass layer 13 have a relationship of 0.82 ⁇ TW / Wca ⁇ 0.92 (see FIG. 1).
- the belt layer 14 includes the circumferential reinforcing layer 145, thereby suppressing the radial growth of the center region.
- the ratio TW / Wca is within the above range, the difference in diameter growth between the center region and the shoulder region is alleviated, and the contact pressure distribution in the tire width direction is made uniform. Thereby, there exists an advantage by which the contact pressure distribution of a tire is equalized.
- the pneumatic tire 1 includes an additional belt 144 disposed on the outer side in the tire radial direction of the outer diameter side cross belt 143, and further includes an inner diameter side cross belt 142, an outer diameter side cross belt 143, and a circumferential reinforcing layer 145.
- the laminated body in FIG. 2 and FIG. 3, the belt layer 14 which consists of an additional belt 144 is arrange
- a high-angle belt belt angle of 45 [deg] or more and 70 [deg] or less in absolute value
- one belt ply can be excluded, and there is an advantage that the weight of the tire can be reduced.
- the belt cord of the circumferential reinforcing layer 145 is a steel wire and has an end number of 17 [pieces / 50 mm] or more and 30 [pieces / 50 mm] or less.
- the elongation at the time of a tensile load of 100 [N] to 300 [N] at the time of the member of the belt cord constituting the circumferential reinforcing layer 145 is 1.0 [%] or more and 2.5 [ %] Or less.
- the elongation of the belt cord constituting the circumferential reinforcing layer 145 at the time of a tensile load of 500 [N] to 1000 [N] is 0.5 [%] or more and 2.0 [[ %] Or less.
- the circumferential reinforcing layer 145 has a narrower cross belt (in FIG. 1, the outer diameter side crossing in FIG. 1) of the pair of cross belts (the inner diameter side cross belt 142 and the outer diameter side cross belt 143).
- the belt 143) is disposed on the inner side in the tire width direction from the left and right edge portions (see FIG. 3).
- the pneumatic tire 1 is disposed between the pair of cross belts 142 and 143 and on the outer side in the tire width direction of the circumferential reinforcing layer 145 and adjacent to the circumferential reinforcing layer 145, and a pair of An end portion relaxation rubber 192 disposed between the cross belts 142 and 143 and located outside the stress relaxation rubber 191 in the tire width direction and corresponding to the edge portions of the pair of cross belts 142 and 143 and adjacent to the stress relaxation rubber 191. (See FIG. 5).
- the circumferential reinforcing layer 145 is arranged on the inner side in the tire width direction with respect to the left and right edge portions of the narrow cross belt 143 of the pair of cross belts 142 and 143, whereby the edge of the circumferential reinforcing layer 145 There is an advantage that fatigue rupture of peripheral rubber at the portion is suppressed. Further, since the stress relaxation rubber 191 is disposed on the outer side in the tire width direction of the circumferential reinforcing layer 145, the shear strain of the peripheral rubber between the edge portion of the circumferential reinforcing layer 145 and between the cross belts 142 and 143 is relaxed.
- the end relaxation rubber 192 is disposed at a position corresponding to the edge portions of the cross belts 142 and 143, the shear strain of the peripheral rubber at the edge portions of the cross belts 142 and 143 is reduced.
- the modulus Ein of the stress relaxation rubber 191 when stretched 100% and the modulus Eco when the coat rubber of the pair of cross belts (the inner diameter side cross belt 142 and the outer diameter side cross belt 143) are stretched 100%.
- the modulus Ein of the stress relaxation rubber 191 is optimized, and there is an advantage that the shear strain of the peripheral rubber between the edge portion of the circumferential reinforcing layer 145 and the cross belts 142 and 143 is relaxed.
- the modulus Ein of the stress relaxation rubber 191 when stretched 100% and the coat rubber of the pair of cross belts 142 and 143 (the inner diameter side cross belt 142 and the outer diameter side cross belt 143) are stretched 100%.
- the modulus Eco has a relationship of 0.60 ⁇ Ein / Eco ⁇ 0.90 (see FIG. 5).
- the modulus Ein of the stress relaxation rubber 191 is optimized, and there is an advantage that the shear strain of the peripheral rubber between the edge portion of the circumferential reinforcing layer 145 and the cross belts 142 and 143 is relaxed.
- the modulus Ein at 100% elongation of the stress relaxation rubber 191 is in the range of 4.0 [MPa] ⁇ Ein ⁇ 5.5 [MPa] (see FIG. 5).
- the modulus Ein of the stress relaxation rubber 191 is optimized, and there is an advantage that the shear strain of the peripheral rubber between the edge portion of the circumferential reinforcing layer 145 and the cross belts 142 and 143 is relaxed.
- the circumferential reinforcing layer 145 has a narrower cross belt (in FIG. 1, the outer diameter side crossing in FIG. 1) of the pair of cross belts (the inner diameter side cross belt 142 and the outer diameter side cross belt 143).
- the belt 143) is disposed on the inner side in the tire width direction from the left and right edge portions (see FIG. 1).
- the width Wb3 of the narrow cross belt 143 and the distance S from the edge portion of the circumferential reinforcing layer 145 to the edge portion of the narrow cross belt 143 satisfy 0.03 ⁇ S / Wb3 ⁇ 0.12. It is in range (see FIG. 3).
- the pneumatic tire 1 is a heavy load having a flatness of 40% to 75% in a state where the tire is assembled on a regular rim and a normal internal pressure and a normal load are applied to the tire. It is preferably applied to heavy duty tires.
- the heavy load tire has a larger load when the tire is used than the tire for a passenger car. For this reason, the radial difference between the arrangement region of the circumferential reinforcing layer and the region outside the circumferential direction of the circumferential reinforcing layer is likely to be large. Further, in a tire having a low flatness ratio as described above, the ground contact shape tends to be a drum shape. Therefore, the effect of the circumferential reinforcing layer 145 is remarkably obtained by using the heavy duty tire as an application target.
- 7 to 9 are tables showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- an indoor drum tester is used, and conditions of a running speed of 45 [km / h] and a slip angle of ⁇ 2 [deg] are given to the test tire. Then, the load is increased by 5 [%] (1.74 [kN]) every 12 hours from the load 34.81 [kN], and the running distance until the tire breaks is measured. Then, based on this measurement result, index evaluation using the conventional example as a reference (100) is performed. This evaluation is preferable as the numerical value increases. In particular, if the evaluation is 105 or more (+5 points or more with respect to the reference value of 100), there is a sufficient advantage over the conventional example, and if the evaluation is 110 or more, a significant advantage over the conventional example. It can be said that there is sex.
- the test tires of Examples 2 to 36 are modifications of the test tire of Example 1.
- the conventional test tire does not include the circumferential reinforcing layer 145 in the configuration shown in FIGS.
- a high-angle belt having a belt angle of 60 [deg] is provided between the inner diameter side crossing belt 142 and the carcass layer 13. Therefore, the belt layer 14 has a structure in which four belt plies are laminated. Further, the belt angle of the pair of cross belts 142 and 143 is closer to the tire circumferential direction (45 [deg] or less).
- the test tire of the comparative example includes a high-angle belt having a belt angle of 60 [deg] between the inner diameter side crossing belt 142 and the carcass layer 13 in the configuration of FIGS. Therefore, the belt layer 14 has a structure in which five belt plies are laminated. Further, the pair of cross belts 142 and 143 have a belt angle closer to the tire circumferential direction (45 [deg] or less).
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Abstract
Description
図1は、この発明の実施の形態にかかる空気入りタイヤを示すタイヤ子午線方向の断面図である。同図は、空気入りタイヤ1の一例として、長距離輸送用のトラック、バスなどに装着される重荷重用ラジアルタイヤを示している。なお、符号CLは、タイヤ赤道面である。また、同図では、トレッド端Pとタイヤ接地端Tとが、一致している。また、同図では、周方向補強層145にハッチングを付してある。
図2および図3は、図1に記載した空気入りタイヤのベルト層を示す説明図である。これらの図において、図2は、タイヤ赤道面CLを境界としたトレッド部の片側領域を示し、図3は、ベルト層14の積層構造を示している。なお、図3では、各ベルトプライ142~145中の細線が各ベルトプライ142~145のベルトコードを模式的に示している。
また、この空気入りタイヤ1では、相互に隣接する付加ベルト144と外径側交差ベルト143とが、同符号のベルト角度を有する(図3参照)。例えば、図3の構成では、付加ベルト144のベルトコードが、同図下方に向かって左側に傾斜し、また、外径側交差ベルト143のベルトコードが、同図下方に向かって右側に傾斜している。このため、付加ベルト144のベルトコードと外径側交差ベルト143のベルトコードとが、逆方向に傾斜することにより、異符号のベルト角度を有している。
トラック・バスなどに装着される近年の重荷重用タイヤは、低い偏平率を有する一方で、周方向補強層をベルト層に備えることにより、トレッド部の形状を保持している。具体的には、周方向補強層が、トレッド部センター領域に配置されてタガ効果を発揮することにより、トレッド部の径成長を抑制してトレッド部の形状を保持している。
また、この空気入りタイヤ1では、タイヤ赤道面CLにおけるトレッドプロファイルからタイヤ内周面までの距離Gccと、トレッド端Pからタイヤ内周面までの距離Gshとが、0.80≦Gsh/Gcc≦1.20の関係を有する。また、比Gsh/Gccが、0.85≦Gsh/Gcc≦1.10の関係を有することが好ましい。
図4は、図1に記載した空気入りタイヤの変形例を示す説明図である。同図は、ラウンド形状のショルダー部を有する構成を示している。
また、図1において、トレッド幅TWと、タイヤ総幅SWとが、0.83≦TW/SW≦0.95の関係を有する。また、比TW/SWが、0.85≦TW/SW≦0.93の範囲にあることが好ましい。
図2に示すように、この空気入りタイヤ1は、ベルトクッション20を備える。このベルトクッション20は、一対の交差ベルト142、143のうちタイヤ径方向内側にある交差ベルト142の端部と、カーカス層13との間に挟み込まれて配置される。例えば、図2の構成では、ベルトクッション20が、タイヤ径方向外側の端部を交差ベルト142の端部とカーカス層13との間に挿入されている。また、ベルトクッション20が、カーカス層13に沿ってタイヤ径方向内側に延在して、カーカス層13とサイドウォールゴム16との間に挟み込まれて配置されている。また、左右一対のベルトクッション20が、タイヤ左右のサイドウォール部にそれぞれ配置されている。
図5は、図1に記載した空気入りタイヤの変形例を示す説明図である。同図は、ベルト層14のタイヤ幅方向外側の端部の拡大図を示している。また、同図では、周方向補強層145およびベルトエッジクッション19にハッチングを付してある。
図6は、図1に記載した空気入りタイヤの変形例を示す説明図である。同図は、タイヤ赤道面CLを境界としたトレッド部の片側領域を示している。
以上説明したように、この空気入りタイヤ1は、カーカス層13と、カーカス層13のタイヤ径方向外側に配置されるベルト層14と、ベルト層14のタイヤ径方向外側に配置されるトレッドゴム15とを備える(図1参照)。また、タイヤ周方向に延在する少なくとも3本の周方向主溝2と、これらの周方向主溝2に区画されて成る複数の陸部3とを備える。また、ベルト層14が、タイヤ周方向に対して絶対値で51[deg]以上80[deg]以下のベルト角度を有すると共に相互に異符号のベルト角度を有する内径側交差ベルト142および外径側交差ベルト143と、タイヤ周方向に対して±5[deg]の範囲内にあるベルト角度を有する周方向補強層145とを備える(図2および図3参照)。
また、この空気入りタイヤ1は、タイヤが正規リムにリム組みされると共にタイヤに正規内圧および正規荷重が付与された状態にて、偏平率が40[%]以上75[%]以下である重荷重用タイヤに適用されることが好ましい。重荷重用タイヤでは、乗用車用タイヤと比較して、タイヤ使用時の負荷が大きい。このため、周方向補強層の配置領域と、周方向補強層よりもタイヤ幅方向外側の領域との径差が大きくなり易い。また、上記のような低い偏平率を有するタイヤでは、接地形状が鼓形状となり易い。そこで、かかる重荷重用タイヤを適用対象とすることにより、周方向補強層145の作用効果が顕著に得られる。
Claims (15)
- カーカス層と、前記カーカス層のタイヤ径方向外側に配置されるベルト層と、前記ベルト層のタイヤ径方向外側に配置されるトレッドゴムとを備えると共に、タイヤ周方向に延在する少なくとも3本の周方向主溝と、これらの周方向主溝に区画されて成る複数の陸部とを備える空気入りタイヤであって、
前記ベルト層が、
タイヤ周方向に対して絶対値で51[deg]以上80[deg]以下のベルト角度を有すると共に相互に異符号のベルト角度を有する内径側交差ベルトおよび外径側交差ベルトと、
タイヤ周方向に対して±5[deg]の範囲内にあるベルト角度を有する周方向補強層とを備えることを特徴とする空気入りタイヤ。 - 前記周方向補強層が、前記内径側交差ベルトと前記外径側交差ベルトとの間に配置される請求項1に記載の空気入りタイヤ。
- タイヤ赤道面におけるトレッドプロファイルからタイヤ内周面までの距離Gccと、トレッド端からタイヤ内周面までの距離Gshとが、Gsh/Gcc≦1.20の関係を有する請求項1または2に記載の空気入りタイヤ。
- タイヤ子午線方向の断面視にて、前記周方向主溝の末端摩耗面WEを引くときに、
タイヤ赤道面上における前記周方向補強層から末端摩耗面WEまでの距離Dccと、前記周方向補強層の端部から末端摩耗面WEまでの距離Deとが、0.95≦De/Dcc≦1.05の関係を有する請求項1~3のいずれか一つに記載の空気入りタイヤ。 - 前記内径側交差ベルトおよび外径側交差ベルトのうち幅広な交差ベルトの幅Wb2と前記カーカス層の断面幅Wcaとが、0.73≦Wb2/Wca≦0.89の関係を有する請求項1~4のいずれか一つに記載の空気入りタイヤ。
- 前記周方向補強層の幅Wsと、前記カーカス層の幅Wcaとが、0.60≦Ws/Wca≦0.70の関係を有する請求項1~5のいずれか一つに記載の空気入りタイヤ。
- トレッド幅TWと、タイヤ総幅SWとが、0.83≦TW/SW≦0.95の関係を有する請求項1~6のいずれか一つに記載の空気入りタイヤ。
- 前記カーカス層の最大高さ位置の径Yaと、前記周方向補強層の端部位置における前記カーカス層の径Ydとが、0.95≦Yd/Ya≦1.02の関係を有する請求項1~7のいずれか一つに記載の空気入りタイヤ。
- 前記内径側交差ベルトおよび前記外径側交差ベルトのコートゴムの100%伸張時モジュラスE2、E3と、前記周方向補強層のコートゴムの100%伸張時モジュラスEsとが、0.90≦Es/E2≦1.10かつ0.90≦Es/E3≦1.10の関係を有する請求項1~8のいずれか一つに記載の空気入りタイヤ。
- 前記周方向補強層のコートゴムの破断伸びλsが、λs≧200[%]の範囲にある請求項1~9のいずれか一つに記載の空気入りタイヤ。
- 前記内径側交差ベルトおよび前記外径側交差ベルトのコートゴムの破断伸びλ2、λ3が、λ2≧200[%]かつλ3≧200[%]の範囲にある請求項1~10のいずれか一つに記載の空気入りタイヤ。
- 前記一対の交差ベルトのうちタイヤ径方向内側にある交差ベルトの端部と、前記カーカス層との間に挟み込まれて配置されるベルトクッションを備え、且つ、
前記ベルトクッションの100%伸張時モジュラスEbcが、1.5[MPa]≦Ebc≦3.0[MPa]の範囲内にある請求項1~11のいずれか一つに記載の空気入りタイヤ。 - 前記ベルトクッションの破断伸びλbcが、λbc≧400[%]の範囲にある請求項12に記載の空気入りタイヤ。
- トレッド幅TWと、前記カーカス層の断面幅Wcaとが、0.82≦TW/Wca≦0.92の関係を有する請求項1~13のいずれか一つに記載の空気入りタイヤ。
- 前記外径側交差ベルトのタイヤ径方向外側に配置される付加ベルトを備え、且つ、
前記内径側交差ベルト、前記外径側交差ベルト、前記周方向補強層および前記付加ベルトから成る積層体が、前記カーカス層に隣接して配置される請求項1~14のいずれか一つに記載の空気入りタイヤ。
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US14/405,146 US9849730B2 (en) | 2012-07-13 | 2013-06-07 | Pneumatic tire |
CN201380030179.9A CN104395104B (zh) | 2012-07-13 | 2013-06-07 | 充气轮胎 |
DE112013002605.8T DE112013002605B4 (de) | 2012-07-13 | 2013-06-07 | Luftreifen |
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