WO2006070570A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2006070570A1 WO2006070570A1 PCT/JP2005/022460 JP2005022460W WO2006070570A1 WO 2006070570 A1 WO2006070570 A1 WO 2006070570A1 JP 2005022460 W JP2005022460 W JP 2005022460W WO 2006070570 A1 WO2006070570 A1 WO 2006070570A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- belt
- layer
- cord
- folded
- tire
- Prior art date
Links
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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/26—Folded 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
- B60C2009/2038—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel using lateral belt strips at belt edges, e.g. edge bands
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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
- Y10T152/10792—Structure where each bias angle reinforcing cord ply has no opposingly angled ply
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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 carcass having at least one ply force extending in a toroidal shape, and a belt having at least two belt layer forces formed on the outer peripheral side of the crown portion of the carcass and coated with rubber.
- it relates to pneumatic tires in which cords form crossing belts between adjacent belt layers across the equatorial plane of the tire, and are particularly durable by preventing separation from the belt end of a powerful pneumatic tire. To improve.
- a pneumatic tire usually has one or two ply strength carcass and a belt composed of at least two belt layers on the outer peripheral side of the carcass, and a cord is formed between adjacent belt layers.
- the belts are laminated so that they cross each other across the tire equatorial plane, and a cross belt is used.
- organic fiber cords with an angle of 10 degrees or less to the tire equatorial plane are covered with rubber.
- the reinforcing layer is spirally wound so as to cover the belt layer.
- the number of carcass splines the number of belt layers is increased, and the cords that make up the reinforcement layer are made of steel cords.
- the member which becomes a skeleton is reinforced.
- the belt layer is formed by applying an adhesive to a large number of cords arranged in parallel and cutting the interdigital belt member obtained by covering the cord with rubber so as to have a predetermined cord extension angle and width. Is done. At this time, the cut surface of the belt member, that is, the both ends of the belt layer is exposed to the cut surface of the cord, and the adhesive is not applied to the cut surface. Is very bad and therefore is prone to cracking. In this way, cracks are likely to occur at both ends of the belt where the strain is maximum! Having a cut surface of the cord is another factor that causes cracks from both ends of the belt.
- JP-A-8-282209, JP-A-8-318705, and JP-A-11-321222 include A pneumatic tire is described in which a belt layer having a large width is a folded belt layer in which both end portions of the belt are folded inward in the tire width direction.
- both width ends of the belt have a folded structure, so that the binding force between the belt layers increases, and displacement of both width ends in the tire circumferential direction is suppressed. Generation of cracks due to rubber shearing can be prevented. Further, since there is no cut surface of the cord at both width end portions of the belt where the strain is maximum, the occurrence of cracks due to this can be prevented.
- an object of the present invention is to disperse or reduce the compressive force applied to the organic fiber cord at the width end portion of the folded belt layer even when the folded belt layer using the organic fiber cord is configured.
- the present invention provides at least one sheet of a carcass that also has a plying force extending in a toroid shape, and at least two sheets that are positioned on the outer peripheral side of the crown portion of the carcass and covered with a rubber cord.
- a pneumatic tire comprising a belt that also has a belt layer force, and in which a cross belt is formed in which adjacent cord layers cross each other across the tire equator plane, of the belt layers constituting the belt
- the widest belt layer is formed by extending from at least one width end portion of the main body portion which forms a cross belt together with other adjacent belt layers, and folded back to the outer peripheral surface side of the main body portion.
- a folded belt layer composed of folded portions, and the cord constituting the folded belt layer is an organic fiber cord, and is connected to the folded portion of the main body portion of the folded belt layer.
- This is a pneumatic tire characterized in that a narrow belt reinforcing layer formed by covering a cord with rubber is disposed immediately below the width end portion. According to this, as a result of the fraying of the organic fibers being suppressed by the provision of the belt reinforcing layer, the durability can be improved.
- the belt reinforcement layer is disposed at "at least the position of the main body portion of the folded belt layer immediately below the width end portion connected to the folded portion” means that the belt reinforcing layer force folded belt layer body portion is folded. End force in the tire width direction that is continuous with the tire part It is located inward along the tire radial direction, and this force means a state extending inward and Z or outward in the tire width direction. “Narrow belt reinforcing layer” means that the width of the belt reinforcing layer is less than the half width of the belt.
- the belt reinforcing layer is disposed over a range of 10 to LOOmm from the position immediately below the width end portion of the body portion of the folded belt layer toward the inside in the tire width direction.
- the cord constituting the belt reinforcement layer is inclined in the same direction as the cord of the main part of the folded belt layer with respect to the tire equator plane, and the cord constituting the belt reinforcement layer and the tire equator plane are In this case, it is preferable that the angle formed is in the range of 10 to 60 degrees.
- the angle formed by the cord constituting the belt reinforcement layer and the tire equatorial plane is the cord and tire constituting the main part of the folded belt layer. More preferably, it is substantially the same as the angle formed with the equator plane.
- substantially the same as the angle between the cord constituting the main part of the folded belt layer and the tire equatorial plane here means that the cord constituting the main part of the folded belt layer and the tire equatorial plane is formed.
- the angle is within ⁇ 20 degrees, preferably within ⁇ 10 degrees.
- the cord constituting the belt reinforcing layer is inclined so as to intersect with the cord of the main body portion of the folded belt layer across the tire equator plane, and the cord constituting the belt reinforcing layer and the tire equator plane Is preferably in the range of 20 to 70 degrees.
- the belt reinforcing layer restrains the movement of the width end portion of the body portion of the folded belt layer in the tire circumferential direction and reduces the compressive force applied to the cord.
- the durability can be improved by suppressing the above.
- the belt reinforcing layer is folded together with the folded belt layer on the outer peripheral surface side of the folded belt layer main body.
- the other belt layer is positioned at least on the outer peripheral surface side of the folded belt layer, and the folded belt layer is configured to wrap the width end portion of the other belt layer by the main body portion and the folded portion. It is preferable.
- the cord constituting the belt reinforcing layer is preferably any one of an organic fiber cord, a glass fiber cord, and a steel cord according to the mass, rigidity, and the like required for the belt reinforcing layer.
- FIG. 1 is a cross-sectional view in the width direction of a typical pneumatic tire according to the present invention.
- Fig. 2 is a view showing an embodiment of the arrangement of the belt of the tire shown in Fig. 1 and the cord of the belt reinforcing layer.
- Fig. 3 shows another arrangement of the belt of the tire shown in Fig. 1 and the cord of the belt reinforcing layer. It is a figure which shows an embodiment.
- FIG. 4 is a cross-sectional view in the width direction of another pneumatic tire according to the present invention.
- FIG. 5 is a diagram showing an embodiment of a state in which the belt of the pneumatic tire shown in FIG. 4 and the cord of the belt reinforcing layer are arranged.
- FIG. 6 is a view showing another embodiment of the arrangement state of the belt of the pneumatic tire shown in FIG. 4 and the cord of the belt reinforcing layer.
- FIG. 7 is a cross-sectional view in the width direction of another pneumatic tire according to the present invention.
- Fig. 8 is a view showing one embodiment of a state of arrangement of the belt of the pneumatic tire shown in Fig. 7 and the cord of the belt reinforcing layer.
- FIG. 9 is a view showing another embodiment of the arrangement state of the belt of the pneumatic tire shown in FIG. 7 and the cord of the belt reinforcing layer.
- FIG. 10 is a cross-sectional view in the width direction of another pneumatic tire according to the present invention.
- FIG. 11 is a diagram showing an embodiment of a state in which the belt of the pneumatic tire shown in FIG. 10 and the cord of the belt reinforcing layer are arranged.
- FIG. 12 is a view showing another embodiment of the arrangement state of the belt of the pneumatic tire shown in FIG. 10 and the cord of the belt reinforcing layer.
- FIG. 13 is a cross-sectional view in the width direction of the pneumatic tire of Conventional Example 1.
- FIG. 14 is a cross-sectional view in the width direction of a pneumatic tire of Conventional Example 2.
- FIG. 1 is a sectional view in the tire width direction of a typical pneumatic tire (hereinafter referred to as “tire”) according to the present invention.
- FIG. 2 is a view showing the arrangement of the cord of the tire belt and belt reinforcing layer of the first embodiment of the present invention
- FIG. 3 is the cord of the tire belt and belt reinforcing layer of the second embodiment of the present invention. It is a figure which shows the arrangement
- a tire 1 shown in FIG. 1 includes at least one ply extending between a pair of bead cores 2 and 2, a carcass 3 having a single ply force in FIG. 1, and a crown portion 4 of the carcass 3. 1 is provided with at least two belt layers made of rubber-coated cords, and in FIG. 1, a belt 7 composed of two belt layers 5 and 6.
- cords 8 and 9 form an intersecting belt that intersects with each other across tire equatorial plane E.
- the main structural feature of the present invention is that the widest belt layer 6 of the belt layers constituting the belt 7 is a main body portion 1 that forms a cross belt together with other adjacent belt layers 5.
- 1 and at least one width end portion of the main body 10, in FIG. 1 extends from both width end portions 11 and 11, and is a folded portion including folded portions 12 and 12 formed by folding back to the outer peripheral surface side of the main body portion 10.
- the cord 9 that constitutes the belt layer and constitutes the folded belt layer 6 is an organic fiber cord.
- the narrow belt reinforcement layers 14 and 14 formed by covering the cords 13 with rubber are disposed immediately below the portions 11 and 11.
- the belt reinforcing layers 14 and 14 are disposed immediately below the width end portions 11 and 11 of the main body portion 10 of the folded belt layer 6, and the belt reinforcing layers 14 and 14 allow the cord 9 of the main body portion 10 of the belt layer 6 to be cord 9.
- the compressive force applied to is distributed or reduced. As a result, the occurrence of cracks due to fraying of organic fibers can be effectively prevented, and the durability is improved.
- the end of the belt layer having the widest width is folded back because the end of the belt layer tends to crack as the width of the belt layer increases.
- the folded belt layer is less likely to crack at the end compared to the unfolded belt layer, so the widest V and the belt as the folded belt layer are effective in suppressing cracks. It becomes.
- another belt layer may be arranged outside the folded belt layer in the tire radial direction, or another belt layer may be arranged inside the folded belt layer in the tire radial direction.
- other belt layers may be arranged on the outer side and the inner side of the folded belt layer in the tire radial direction.
- the organic fiber constituting the cord 9 of the folded belt layer 6 for example, aromatic polyamide, nylon, glass fiber, and the like can be used.
- the aromatic polyamide has high strength and stretches even at high temperatures. Since it has a difficult property, it is particularly preferable since the rigidity of the belt is maintained and the driving stability is improved even at high speed when the tire is at a high temperature.
- the cord 8 constituting the other belt layer 5 any steel cord and organic fiber cord without particular limitation may be used.
- the cord in the portion 5 to LOmm from the width end portion tends to fray in the tire width direction. Therefore, if a belt reinforcement layer is provided so as to cover the inner part of the 5-mm LOmm from the end of the width, the compression strain of the part where the cord is likely to fray can be reduced, making it more effective and durable. Can be improved. More specifically, the belt reinforcing layer 14 is disposed at least in the range 10 to LOOmm toward the inner side in the tire width direction, with the force at the position directly below the width end portions 11 and 11 of the main body portion 10 of the folded belt layer 6. It is preferable to do.
- the belt reinforcement layer 14 may not be able to fully exert the effect of reducing the compressive strain. If it exceeds 100 mm, the right and left belt reinforcement layers are used for small tires. 14 and 14 overlap, or the belt reinforcement layer 14 has the same tread reinforcement effect as the belt 7, and the tread becomes too stiff and difficult to bend. This is because there is a concern that the area of contact with the ground may decrease and the handling stability may be impaired.
- the cord 13 constituting the belt reinforcing layer 14 and the cord 9 of the main body portion 10 of the folded belt layer 6 are inclined in the same direction with respect to the tire equatorial plane E.
- the cord of the inner portion of the folded belt layer 6 that is 5 to 10 mm from the width end portion 11 of the main body portion 10 is most likely to fray, but the compressive force acting on this portion is the component of the tire width direction component and the tire circumferential direction component. I have both.
- the cord 13 constituting the belt reinforcing layer 14 is disposed inclined with respect to the tire equatorial plane E. It is preferable to support both the tire width direction component and tire circumferential direction component of the compressive force, and the cord 9 constituting the main body portion 10 of the folded belt layer 6 and the tire equatorial plane E More preferably ⁇ ⁇ 10 degrees
- angle ⁇ is generally defined as 20 to 50 degrees
- ⁇ is 10 to 60 degrees.
- the angle 0 is less than 10 degrees, the effect of supporting the tire width direction component of the compressive force is insufficient, and when it exceeds 60 degrees, the effect of supporting the tire circumferential direction component of the compressive force is insufficient. This is because in any case, there is concern about the occurrence of cracks.
- the angle ⁇ formed by the cord 13 constituting the belt reinforcing layer 14 and the tire equatorial plane E is the cord 9 constituting the main body portion 10 of the folded belt layer 6 and the tire red. It is preferably substantially the same as the angle 0 made with the road surface E.
- angle 0 and angle 0 are almost identical
- the cord 13 constituting the belt reinforcing layer 14 bears the largest compressive force
- the cord 9 constituting the main body portion 10 of the belt layer 6 bears the smallest compressive force. This is because the effect of preventing this is the highest.
- the cord 13 of the belt reinforcing layer 14 and the cord 9 of the main body portion 10 of the folded belt layer 6 are arranged so as to intersect with the tire equatorial plane E interposed therebetween.
- the belt reinforcing layer 14 and the width end portion 11 of the main body portion 10 of the folded belt layer 6 are restrained together, and in particular, the cords constituting these are made difficult to move in the tire circumferential direction. This greatly reduces the compression distortion of the code. As a result, cracks caused by fraying of the organic fibers can be effectively prevented, and the durability is improved.
- the angle ⁇ force formed by the cord 13 constituting the belt reinforcing layer 14 and the tire equatorial plane E is in the range of 20 to 70 degrees.
- the angle ⁇ force is less than 3 ⁇ 40 degrees, the restraining action in the tire circumferential direction is reduced, and as a result, the cord 9 in the vicinity of both width end portions 11 and 11 of the main body portion 10 of the folded belt layer 6 is displaced in the tire circumferential direction.
- the cord 13 constituting the belt reinforcing layer 14 and the cord 9 of the main body portion 10 of the folded belt layer 6 intersect when the tire equator plane E is inclined in the same direction and across the tire equator plane E.
- the belt reinforcing layer 14 must be folded together with the folded belt layer 6 on the outer peripheral surface side of the body portion 10 of the folded belt layer 6. Is preferred.
- the cord 13 is a free end in the vicinity of the width end portion of the belt reinforcing layer 14, so that when the compressive force is applied, the cord 13 escapes from the compressive force.
- the cord 13 constituting the belt reinforcing layer 14 and the cord 9 constituting the main body portion 10 of the folded belt layer 6 may not sufficiently exert the effect of dispersing the compression force.
- the belt reinforcing layer 14 is folded back as described above, the free end of the cord 13 disappears at the width end of the belt reinforcing layer 14, and as a result, the effect of dispersing the compressive force can be further enhanced.
- the belt reinforcing layer 14 is also folded, so that the periphery of the width end portion 11 of the folded belt layer 6 is increased.
- the cord 9 and the cord 13 of the belt reinforcing layer 14 are surely crossed and the width end portion 11 of the folded belt layer 6 is more firmly restrained. As a result, the compression of the cord 9 is further suppressed and cracks are not generated. It is also a power that can be prevented more reliably. Furthermore, since the cut end of the cord 13 of the belt reinforcing layer 14 is positioned inside the belt 7 in the tire width direction from the maximum width position of the belt 7, a crack is generated from the cut end of the cord 13 of the belt reinforcing layer 14. Can also be prevented.
- FIGS. 1 to 3 show an embodiment in which another belt layer 5 is arranged on the outer side in the tire radial direction of the folded portion 12 of the folded belt layer 6, and FIGS. 4 to 6 show the folded portion 12 of the folded belt layer 6.
- the folded belt layer 6 has another body belt 10 and a folded portion 12.
- a configuration in which the wide end portions 15 and 15 of the layer 5 are wrapped is also possible.
- the width end portions 15 and 15 of the other belt layer 5 are covered with the folding portion 12 of the folded belt layer 6, the occurrence of cracks from the width end portions 15 and 15 of the other belt layer 5 is also prevented. I also like the ability to do it!
- the cord 13 constituting the belt reinforcing layer 14 is preferably an organic fiber cord, a glass fiber cord or a steel cord depending on the weight, rigidity, etc. required for the belt reinforcing layer. Since the organic fiber cord is supple, the increase in rigidity at both ends of the tread due to the belt reinforcement layer 14 is small, and there is no risk of impairing steering stability due to poor grounding performance. This is advantageous.
- the organic fiber for example, aromatic polyamide or nylon can be used.
- the glass fiber cord is advantageous in that it is lightweight but has high compression resistance. Furthermore, although steel cord is somewhat disadvantageous in terms of weight, it can be said that it is the most excellent material from the viewpoint of improving durability with the highest compression resistance.
- the belt may be composed of two belt layers, or three or more belt layers.
- a part of the other belt layer is wrapped with the folded belt layer, and the remaining belt layer is inside the tire radial direction of the folded belt layer.
- a so-called cap layer that suppresses the growth of the belt diameter can be provided on the outer peripheral side of the belt.
- the belt reinforcing layer is disposed at a position corresponding to both width end portions of the folded belt layer.
- the belt reinforcing layer may be disposed only on one width end portion.
- the tires of Examples 1 to 7 are radial tires for passenger cars having a tire size of 225Z50R16, and two ply forces formed by rubber coating a nylon cord extending in a direction of 90 degrees with respect to the tire equatorial plane.
- the width end portion of the other belt layer is located at the width end portion force of the body portion of the folded belt layer and is located 25 mm away from the inner side in the tire width direction.
- the belt reinforcement layer is arranged within the range of 20mm inward in the width direction of the tire, and the specifications shown in Table 1 are also provided.
- the pair of belt reinforcing layers are positioned at the positions immediately below the both width ends of the main body portion of the folded belt layer.
- the width end portions of the main body of the folded belt layer, the other belt layers, and the belt reinforcing layer are substantially aligned and have the specifications shown in Table 1.
- Example 7 as shown in FIGS.
- the pair of belt reinforcing layers are formed such that the width of the folded portion on the inner side in the tire radial direction is 20 mm and the width of the folded portion on the outer side in the tire radial direction. Is folded back with the folded belt layer so that the width is 15 mm, and the width belt end portions of the folded belt layer, the other belt layer and the belt reinforcing layer are substantially aligned. Has the specifications shown. [0035]
- the tires of Examples 8 to 14 are radial tires for passenger cars having a tire size of 225Z50R16, and two ply forces formed by rubber coating nylon cords extending in the direction of 90 degrees with respect to the tire equatorial plane.
- belt layers made of rubber coated cord fiber cord (twisted cord with a diameter of 0.9 mm, driving distance of 1.5 mm) extending in the direction of 30 degrees to the tire equatorial plane.
- These belt layers have a belt (width 210 mm) arranged so as to be a cross belt.
- the wider belt layer is a folded belt layer having a pair of folded portions each having a width of 25 mm at both ends.
- another belt layer is provided. Wrapping the wide end of the belt layer.
- the L 1 tire has a width of 20 mm in both the inside and outside of the tire in the tire width direction centered on the position immediately below both width ends of the body portion of the folding belt layer, and a total of 40 mm.
- a pair of belt reinforcing layers formed by rubber-covering cords extending in a direction intersecting with the cord of the main body of the layer and the tire equatorial plane, and having a configuration as shown in FIGS. It has the specifications shown in Table 2. Further, the tires of Examples 12 to 14 were folded together with the folded belt layer, and the position force immediately below both width ends of the body portion of the folded belt layer 20 mm inward in the tire width direction, the folded portion of the folded belt layer.
- a pair of belt reinforcement layers that extend 10 mm each in the tire width direction are arranged in the tire width direction, and have the configuration shown in FIGS. 10 and 12 and the specifications shown in Table 2.
- the extension angle of the cord inevitably varies. Therefore, in the actual belt reinforcement layer, the extension angle shown in Table 1 is about 5 degrees. There was a range of variation.
- the “drive-in interval” here refers to the distance between the cord centers in the rubber coating layer of the cord. For example, when the drive-in interval is 1.5 mm, 100 cords are arranged in a width of 150 mm. Means that
- the tire size, carcass and belt layer are the same as in Examples 1 to 7, but no belt reinforcing layer is provided, and FIG. 13 (Conventional Example 1) and FIG. 14 (Conventional Example). 2)
- the tire having the specifications shown in Table 1 and the tire size, carcass and belt layer are the same as those in Examples 8 to 14, but the belt reinforcing layer is not included.
- a tire of Conventional Example 3 having the configuration shown in FIG. 13 and the specifications shown in Table 2 was also tested.
- Each of the test tires is assembled into a wheel having a size of 7JJ to form a tire wheel.
- the tire wheel has an internal pressure of 13 OkPa lower than the normal internal pressure (220 kPa) in order to induce belt failure early.
- extension angle refers to the angle between the cord and the tire equator.
- the score of the fraying of the cord was 0 when no fraying or peeling of the rubber was observed, and a slight fraying was observed on the surface of the cord, but the cord was tightly attached to the cord and it was attached to the cord.
- the rubber was peeled off with no power 1, and the surface of the cord started to fray and the rubber started to crack 2 with cracks.
- Example 7 in which the belt reinforcing layer was folded was compared with Example 2 in which the belt reinforcing layer was not folded.
- the fraying prevention effect of the belt was maintained at the same level, while the crack prevention effect at the end of the belt reinforcement layer was excellent.
- the use of a steel with a thin wire diameter was superior in the cord fraying prevention effect and the crack prevention effect at the end of the belt reinforcing layer.
- Example 8 ⁇ When comparing the three LOs, it can be seen that the fraying prevention effect is particularly high when the cord extension angle is 45 degrees or less. This is presumably because the extension angle of the cord of the belt reinforcing layer was 60 degrees in the radial direction in the tire of Example 10, and the effect of suppressing the movement in the tire circumferential direction was small. Compared to the tire of Conventional Example 3, the effect of preventing fraying of the cord is clearly improved. A comparison of Example 9 and Example 11 shows a similar effect in terms of preventing fraying of the cord. Example 11 using a nylon cord with a narrow cord diameter and good adhesion to rubber. This was more effective in preventing cracks at the end of the belt reinforcement layer.
- Examples 12 to 14 in which the belt reinforcing layer is folded back are Examples 8 to in which the belt reinforcing layer is not folded back: Compared with L1, the fraying prevention effect of the cord was maintained at the same level, and the crack prevention effect at the end of the belt reinforcing layer was excellent.
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- Mechanical Engineering (AREA)
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2006550646A JP4708363B2 (ja) | 2004-12-27 | 2005-12-07 | 空気入りタイヤ |
EP05814185A EP1832446B1 (en) | 2004-12-27 | 2005-12-07 | Pneumatic tire |
US11/794,205 US8079393B2 (en) | 2004-12-27 | 2005-12-07 | Pneumatic tire with narrow belt reinforcing layer immediately below with terminal end of folded belt layer |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004376161 | 2004-12-27 | ||
JP2004-376161 | 2004-12-27 | ||
JP2004-379627 | 2004-12-28 | ||
JP2004379627 | 2004-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006070570A1 true WO2006070570A1 (ja) | 2006-07-06 |
Family
ID=36614695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/022460 WO2006070570A1 (ja) | 2004-12-27 | 2005-12-07 | 空気入りタイヤ |
Country Status (4)
Country | Link |
---|---|
US (1) | US8079393B2 (ja) |
EP (1) | EP1832446B1 (ja) |
JP (1) | JP4708363B2 (ja) |
WO (1) | WO2006070570A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012116405A (ja) * | 2010-12-02 | 2012-06-21 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
US8783315B2 (en) * | 2006-08-11 | 2014-07-22 | Bridgestone Corporation | Pneumatic tire with belt layer, belt reinforcing layer, and pair of folded reinforcing layers |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2887809A1 (fr) * | 2005-06-30 | 2007-01-05 | Michelin Soc Tech | Pneumatique pour vehicules lourds |
EP3064377B1 (en) * | 2013-10-29 | 2018-09-05 | Bridgestone Corporation | Tire |
JP6378571B2 (ja) * | 2014-07-30 | 2018-08-22 | 住友ゴム工業株式会社 | 空気入りタイヤ |
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JPS63125406A (ja) * | 1986-11-12 | 1988-05-28 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JPH01141104A (ja) * | 1987-11-27 | 1989-06-02 | Sumitomo Rubber Ind Ltd | 重荷重用空気入りラジアルタイヤ |
JPH03128702A (ja) * | 1989-07-24 | 1991-05-31 | Sumitomo Rubber Ind Ltd | 重荷重用タイヤ |
JPH0489406U (ja) * | 1990-10-29 | 1992-08-05 | ||
JP2004155379A (ja) * | 2002-11-08 | 2004-06-03 | Fuji Seiko Kk | ボディプライコードが交差したラジアルタイヤ |
Family Cites Families (6)
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FR1416538A (fr) * | 1964-09-24 | 1965-11-05 | Fr Du Pneu Englebert Soc | Enveloppe perfectionnée pour pneumatique |
GB1364426A (en) * | 1970-09-11 | 1974-08-21 | Dunlop Holdings Ltd | Pneumatic tyres |
FR2236676B1 (ja) * | 1973-07-11 | 1976-09-17 | Kleber Colombes | |
IT1073357B (it) * | 1976-10-19 | 1985-04-17 | Sarda Off Mecc Spa | Perfezionamenti alle coperture per pneumatici radiali |
JPH03169715A (ja) * | 1989-11-30 | 1991-07-23 | Sumitomo Rubber Ind Ltd | 重荷重用ラジアルタイヤ |
EP0942838B1 (en) * | 1996-11-27 | 2002-06-05 | The Goodyear Tire & Rubber Company | Aircraft tire with improved high speed properties |
-
2005
- 2005-12-07 WO PCT/JP2005/022460 patent/WO2006070570A1/ja active Application Filing
- 2005-12-07 US US11/794,205 patent/US8079393B2/en not_active Expired - Fee Related
- 2005-12-07 EP EP05814185A patent/EP1832446B1/en not_active Expired - Fee Related
- 2005-12-07 JP JP2006550646A patent/JP4708363B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS63125406A (ja) * | 1986-11-12 | 1988-05-28 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JPH01141104A (ja) * | 1987-11-27 | 1989-06-02 | Sumitomo Rubber Ind Ltd | 重荷重用空気入りラジアルタイヤ |
JPH03128702A (ja) * | 1989-07-24 | 1991-05-31 | Sumitomo Rubber Ind Ltd | 重荷重用タイヤ |
JPH0489406U (ja) * | 1990-10-29 | 1992-08-05 | ||
JP2004155379A (ja) * | 2002-11-08 | 2004-06-03 | Fuji Seiko Kk | ボディプライコードが交差したラジアルタイヤ |
Non-Patent Citations (1)
Title |
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See also references of EP1832446A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8783315B2 (en) * | 2006-08-11 | 2014-07-22 | Bridgestone Corporation | Pneumatic tire with belt layer, belt reinforcing layer, and pair of folded reinforcing layers |
JP2012116405A (ja) * | 2010-12-02 | 2012-06-21 | Toyo Tire & Rubber Co Ltd | 空気入りタイヤ |
Also Published As
Publication number | Publication date |
---|---|
EP1832446B1 (en) | 2011-06-08 |
JPWO2006070570A1 (ja) | 2008-08-07 |
JP4708363B2 (ja) | 2011-06-22 |
US8079393B2 (en) | 2011-12-20 |
US20080047649A1 (en) | 2008-02-28 |
EP1832446A1 (en) | 2007-09-12 |
EP1832446A4 (en) | 2009-08-05 |
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