WO2012053226A1 - ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー - Google Patents
ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー Download PDFInfo
- Publication number
- WO2012053226A1 WO2012053226A1 PCT/JP2011/005941 JP2011005941W WO2012053226A1 WO 2012053226 A1 WO2012053226 A1 WO 2012053226A1 JP 2011005941 W JP2011005941 W JP 2011005941W WO 2012053226 A1 WO2012053226 A1 WO 2012053226A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- rubber
- ply
- patch
- radial
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/04—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements
- B29C73/10—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements using patches sealing on the surface of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/04—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements
- B29C73/06—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D using preformed elements using plugs sealing in the hole
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
-
- 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
-
- 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
- Y10T152/10882—Patches
Definitions
- the present invention relates to a radial tire repair method and a repaired radial tire, and more particularly, a radial tire that improves the durability of a patch rubber that is bonded to a damaged portion of a carcass ply from the inner surface of the tire and extends the service life of the repaired tire.
- the present invention relates to a tire repair method.
- Radial tires especially tires for construction vehicles, are subject to side cuts by rocks and large protrusions, and the carcass ply ply cord breaks along with the ply rubber at the sidewalls. May penetrate to the inner liner.
- FIG. 8 is a plan view seen through the carcass ply 5a 1 and the patch rubber 40 bonded to the carcass ply from the inside of the tire in the sidewall portion.
- One tire radial direction is indicated by R.
- a predetermined number of ply cords 6 a among the plurality of ply cords 6 are broken.
- the plurality of ply cords 6 extend radially from the inner side to the outer side in the tire radial direction R.
- the rectangular patch rubber 40 bonded to the damaged area is a cord rubber coating layer obtained by rubber coating and vulcanizing a plurality of patch cords 41 arranged in parallel to each other.
- the patch cord 41 is parallel to the tire radial direction (in FIG. 8, the central ply cord extending direction among the three broken ply cords), and the upper side 42a and the lower side 42b of the rectangle are It bonds together with respect to a damage area
- Patent Document 1 a patch rubber is pasted so as to embed a portion of a rubber layer with a metal cord in which a plurality of metal cords are covered with rubber in a damaged area where a carcass ply is broken, among the patch rubbers.
- a technique for reinforcing a broken portion of the ply cord so that the metal cord is connected is disclosed.
- the tire radial direction inner ends 41a of the plurality of patch cords 41 are arranged in a straight line on the lower side 42b of the rectangle.
- the cut portion (end portion) of the patch cord has a weak adhesive force with the surrounding rubber. For this reason, when the end portions 41a are continuously arranged in a straight line, the interval between the cut portions of the patch cords 41 becomes narrow. In this case, when separation from the surrounding rubber occurs at any one of the plurality of end portions 41a, cracks are likely to propagate to the adjacent end portions.
- the plurality of ply cords 6 extend radially from the inner side to the outer side in the tire radial direction R. Therefore, in the broken ply cord 6a, the tire circumferential direction extending distance y1 of the end portion of the breaking cord on the inner side in the tire radial direction is shorter than the tire circumferential direction extending distance x1 of the end portion of the breaking cord on the outer side in the tire radial direction. Become.
- the lower side 42b of the rectangle is also the same length as the upper side, but from the viewpoint of the reinforcing effect Is an unnecessary length. That is, at the inner end of the patch cord 41 in the tire radial direction, more than necessary ends are arranged in a straight line from the viewpoint of the reinforcing effect.
- the repair method shown in FIG. 8 requires a certain amount of work time, such as buffing around the damaged part or pasting the patch rubber with an adhesive, but as described above, the size is larger than necessary. By pasting patch rubber, the work time is unavoidable.
- the present invention improves the durability of the patch rubber that is bonded to the damaged portion of the carcass ply from the inner surface of the tire, increases the service life of the repaired tire, and shortens the repair work time. It is an object to provide a tire repair method and a radial tire that has been repaired by the method.
- the metal cord embedded in the patch rubber is embedded in the broken ply cord portion and only serves as a substitute for the ply cord, and the effect of reinforcing the damaged portion with the metal cord Therefore, the reinforcing effect is inferior to that of the reinforcing method shown in FIG.
- the gist of the present invention is as follows. (1) A tread portion, a pair of sidewall portions extending inward in the tire radial direction from both side portions of the tread portion, and a bead portion extending inward in the tire radial direction from each sidewall portion, are extended in a toroidal shape. A method for repairing a radial tire having a carcass having at least one radial carcass ply in which a ply cord is covered with a ply rubber, wherein at least one ply cord is broken together with the ply rubber in the side wall portion.
- the reinforcing element is parallel to one tire radial direction
- the patch rubber is affixed so that at least a part of the inner end in the tire radial direction of each of the plurality of reinforcing elements has a different positional relationship in the vertical distance with respect to one tire circumferential line. How to repair radial tires.
- the patch rubber has a substantially trapezoidal shape, Of the pair of opposite sides of the patch rubber that are parallel to each other, the long side is the tire radial direction outside, the short side is the tire radial direction inside, The radial tire repair method according to (1) or (2), wherein the patch rubber is attached so that the long side and the short side extend along the tire circumferential direction.
- the end of the patch rubber located on the extended line of the upper side is located at a position (x / 2) ⁇ 2 to 4 times from the midpoint P of the upper side
- the end of the patch rubber located on the extension line of the lower side is located at a position (y / 2) ⁇ 2 to 4 times from the middle point Q of the lower side
- the end of the patch rubber located on the straight line PQ is located at a position (z / 2) ⁇ 2 to 4 times from the midpoint M of the line segment PQ (length z).
- the patch rubber is made of unvulcanized rubber, The radial tire repair method according to any one of (1) to (5), wherein the damaged portion is partially vulcanized after the step of applying the patch rubber.
- a tread portion, a pair of sidewall portions extending inward in the tire radial direction from both side portions of the tread portion, and a bead portion extending inward in the tire radial direction from each sidewall portion, are extended in a toroid shape
- a radial tire having a carcass having at least one radial carcass ply in which a ply cord is covered with a ply rubber, In the sidewall portion, at least one ply cord is broken along with the ply rubber in the carcass ply,
- a patch rubber including a reinforcing sheet in which a plurality of reinforcing elements arranged in parallel are covered with rubber is bonded to the damaged portion of the carcass ply where the ply cord is broken, The reinforcing element is parallel to one tire radial direction,
- the patch rubber is bonded so that at least a part of the inner end in the tire radial direction of each of the plurality of reinforcing elements has a different positional relationship with respect
- the patch rubber has a substantially trapezoidal shape, Of the pair of opposite sides of the patch rubber that are parallel to each other, the long side is the tire radial direction outside, the short side is the tire radial direction inside, The repaired radial tire according to (13) or (14), wherein the patch rubber is attached so that the long side and the short side extend along the tire circumferential direction.
- a total of two ply cords that are farthest in the tire circumferential direction among the fractured ply cords in a plan view seen through the carcass ply that is most inward from the tire inner side of the sidewall portion When the region connecting the four broken cord ends is defined as a damaged region, the outermost side in the tire radial direction of the damaged region is the upper side (length x), and the innermost side is the lower side (length y).
- the end of the patch rubber located on the extended line of the upper side is located at a position (x / 2) ⁇ 2 to 4 times from the midpoint P of the upper side
- the end of the patch rubber located on the extension line of the lower side is located at a position (y / 2) ⁇ 2 to 4 times from the middle point Q of the lower side
- the end points of the patch rubber located on the straight line PQ are located at a position (z / 2) ⁇ 2 to 4 times from the midpoint M of the line segment PQ (length z).
- a patch rubber for repairing a radial tire Having at least one reinforcing sheet rubber-coated with a plurality of reinforcing elements extending parallel to each other;
- a patch rubber characterized in that at least a part of at least one end of each reinforcing element among the two ends of the plurality of reinforcing elements is in a positional relationship with different vertical distances from an arbitrary straight line.
- the inner end in the tire radial direction of each of the plurality of reinforcing elements is affixed with the patch rubber so that the vertical distance with respect to one tire circumferential line has a different positional relationship.
- the inner ends of the patch cords in the tire radial direction are not aligned in a straight line. Therefore, the durability of the patch rubber bonded to the damaged portion of the carcass ply from the tire inner surface side can be improved, and the service life of the repaired tire can be extended.
- the patch rubber is not affixed to unnecessary portions from the viewpoint of the reinforcing effect as compared with the rectangular shape as shown in FIG. You can also
- FIG. 1 is a half cross-sectional view in the tire width direction of a representative repaired radial tire according to the present invention.
- the left figure is an enlarged view of the damaged part of the carcass 5 of the sidewall part 3 in FIG. 1, and the right figure is a view of the damaged part observed from the inner surface side of the tire, with the patch rubber 10 attached.
- the boundary lines on the tire outer surface of the damaged portion 7 of the carcass ply and the side rubber portion 33 newly filled at the time of repair are shown by broken lines.
- FIG. 5B is a view showing a state where the side rubber portion 30 around the damaged portion 7 is removed from the outside of the tire until the carcass ply is exposed.
- FIG. 5C is a view showing the inner liner rubber portion 31 around the damaged portion 7 being replaced with the carcass ply.
- FIG. 5 is a perspective view of the carcass ply 5a 1 located most inside the tire and the patch rubber 10 bonded to the carcass ply from the inside of the tire in the sidewall portion, and the relationship between the ply cord 6 and the patch cord 11 will be described. Therefore, although these are covered with rubber, the ply cord 6 is indicated by a solid line and the patch cord 11 is indicated by a broken line.
- FIG. It is the figure which extracted only the patch rubber 10 from the II sectional drawing in FIG. It is a schematic diagram for demonstrating the magnitude
- FIG. It is the figure which showed the thing of the substantially trapezoid shape in the shape of the patch rubber which can be used by this invention, (a) is the shape where the vertex part of a trapezoid is a curve, (b) is the vertex of a trapezoid. A portion and a parallel pair of opposite sides are curved, and (c) shows a trapezoidal apex portion and a pair of parallel sides other than the pair of opposite sides being curved.
- FIG. 4 is a plan view of a radial tire that has been repaired by a conventional radial tire repair method, as seen in FIG. 4, in which the carcass ply 5a 1 and the patch rubber 10 bonded to the carcass ply are seen from the inside of the side wall of the tire. is there. It is the top view which showed typically the reinforcement element 51 located in the reinforcement sheet
- 1 is a cross-sectional view (half view) in the width direction of a radial tire repaired using a repair method as an example of the present invention.
- (A) is a top view which shows an example of the patch rubber which can be used for the repair method of this invention
- (b) is sectional drawing which follows the JJ line
- (A) to (e) are enlarged cross-sectional views of a damaged portion in the radial tire of FIG. 10, showing the procedure of a repair method as an example of the present invention. It is a top view of the patch rubber explaining the magnitude
- (A) is a diagram showing the patch rubber shape of Comparative Example 20, and (b) to (e) are diagrams showing the patch rubber shapes of Examples 21 to 24, respectively.
- FIG. 1 shows a typical repaired radial tire according to the present invention.
- a radial tire 1 which is a target of the repair method of the present invention includes a tread portion 2 (only the tire half is shown) and a pair of sidewall portions 3 (only one side is shown) extending inward in the tire radial direction from both sides of the tread portion 2. ) And a bead portion 4 (only one side is shown) extending inward in the tire radial direction from each sidewall portion 3, and a carcass 5 having at least one (one in FIG. 1) radial carcass ply 5 a.
- the carcass ply 5a is a cord rubber coating layer in which a plurality of ply cords 6 are coated with ply rubber.
- Examples of the cord material include steel and organic fibers.
- the ply cords 6 are arranged at an angle of 70 ° to 90 ° with respect to the tire circumferential direction.
- Examples of the material for the ply rubber include natural rubber, synthetic rubber, and carbon black.
- the hardness JIS-A hardness (JIS-K-6253) or less, the same applies in this specification) is about 40 to 80. .
- FIG. 3A shows a state in which the radial tire 1 receives a side cut at the sidewall portion 3 and the carcass ply 5a is broken.
- Fig.3 (a) it has penetrated to the inner liner inside a tire.
- a damaged portion of the carcass ply is indicated by reference numeral 7.
- a step of removing the side rubber portion 30 around the damaged portion 7 from the outside of the tire until the carcass ply 5a is exposed is performed.
- the ply is removed until the outermost ply is exposed in the tire width direction.
- the removal of the side rubber portion 30 can be performed using, for example, a re-groove, and the finishing operation can be performed by buffing or the like immediately before the carcass ply 5a is exposed.
- the state after the removal is shown in FIG.
- Examples of the material of the side rubber include natural rubber, synthetic rubber, carbon black and the like, and the hardness is about 30 to 70, which is softer than the ply rubber.
- the inner liner rubber portion 31 around the damaged portion 7 is removed from the inside of the tire until the carcass ply 5a is exposed.
- the ply is removed until the innermost ply is exposed in the tire width direction.
- the inner liner rubber portion 31 can be removed in the same manner as the side rubber portion 30 is removed. Since the patch rubber 10 is later bonded to the surface exposed by removing the inner liner rubber portion 31, it is more preferable to finish the surface by buffing so as to provide appropriate irregularities on the surface.
- the state after removal is shown in FIG.
- the material of the inner liner is butyl rubber, which has high airtightness, and the hardness is even softer than the side rubber.
- the new side rubber portion 33 is an unvulcanized soft rubber, and can be applied so as to fill the damaged portion 7 and the sidewall portion with a spatula, for example.
- the state after filling is shown in FIG.
- the new side rubber portion 33 is preferably made of the same material as before repair.
- FIG. 3E shows a state after the patch rubber 10 is pasted. After applying the patch rubber 10, a new side rubber portion 33 may be filled from the outside of the tire.
- the patch rubber 10 can be easily and reliably attached to the carcass ply 5a by removing the rubber around the damaged portion 7 before attaching the patch rubber 10 as in the present embodiment.
- the patch rubber 10 is constituted by a reinforcing sheet 10 a that is a cord rubber covering layer in which a plurality of reinforcing elements 11 arranged in parallel with each other are covered with rubber.
- the term “a plurality of reinforcing elements arranged in parallel” does not mean that the reinforcing elements are strictly parallel in a mathematical sense, but the reinforcing elements extend in the same direction. It means that Examples of the rubber material that covers the reinforcing element include natural rubber, synthetic rubber, carbon black, and the like. The hardness is about 40 to 80, and the rubber is preferably the same as that used for the carcass ply.
- the reinforcing element 11 is not limited as long as it is an element that reinforces a damaged portion, and not only a twisted cord but also a single filament or a plurality of filaments arranged together. Good.
- a preferable example of the reinforcing element 11 is a very thin nylon cord having a cord diameter of about 0.4 to 1.5 mm.
- the tensile elastic modulus is preferably an average elastic modulus of elongation of x / 3 to 2x / 3 (%) with respect to the breaking elongation x (%), for example, 5 GPa, and 3.0 to 7.0 GPa. preferable.
- the reinforcing element 11 is preferably thinner than the ply cord. This is because if the same material and diameter as the ply coat are used, the reinforcing element bears too much tension and the end portion is easily separated.
- the patch rubber 10 is not embedded in the damaged portion 7 but is bonded as a reinforcing sheet so as to cover the entire damaged portion 7 from the inside of the tire (right diagram in FIG. 2). It is a flat sheet shape.
- the patch rubber 10 before being bonded is preferably unvulcanized rubber, and it is preferable to perform partial vulcanization on the damaged portion 7 after the step of applying the patch rubber 10. This is because, by using unvulcanized rubber, the patch rubber 10 can be affixed densely to the surface of the damaged portion, and as a result of vulcanizing this, bubbles are unlikely to remain around the damaged portion. In addition, even if a pre-vulcanized patch rubber is pasted, the side rubber portion 33 that has been newly filled needs to be partially vulcanized in order to vulcanize the side rubber portion 33, etc. If so, the patch rubber 10 is unnecessarily vulcanized.
- FIG. 2 shows an enlarged view of the repaired portion of the radial tire repaired in this way.
- the patch rubber 10 has a trapezoidal shape, and the long side 12a of the pair of opposite sides 12a and 12b of the patch rubber 10 parallel to each other is the tire.
- the patch rubber 10 is affixed so that the short side 12b extends radially inward, the short side 12b extends in the tire radial direction, and the long side 12a and the short side 12b extend along the tire circumferential direction.
- the tire radial direction is indicated by R.
- a plurality of reinforcing elements 11 are arranged so as to extend in a direction perpendicular to the long side 12a and the short side 12b. Therefore, the patch rubber 10 is affixed so that the reinforcing element 11 is parallel to one tire radial direction R (in this embodiment, the center ply cord extending direction among the three broken ply cords 6a). .
- the tire radial direction inner ends 11a, 11b, and 11c of the reinforcing element are not all aligned.
- the end portion 11a and the end portion 11c are arranged at a wider interval than the end portion 11b, and even if a crack occurs from these end portions, the crack propagates more than a crack occurs from the end portion 11b. Hard to do.
- even if a crack occurs from the end portion 11b it is difficult to propagate to the end portion 11a and the end portion 11c. Therefore, the durability of the patch rubber 10 can be improved and the service life of the repaired tire 1 can be extended.
- the damaged portion 7 has an inverted trapezoidal shape. Accordingly, the patch rubber 10 having the same shape as this is pasted as an inverted trapezoidal shape, so that the patch rubber 10 is pasted necessary and sufficient from the viewpoint of the reinforcing effect. Thus, since it is not necessary to affix a patch rubber of an unnecessary size, the repair work time can be shortened compared to that shown in FIG.
- the arrangement interval of the reinforcing elements 11 is narrower than the arrangement interval of the ply cords. This is because the damaged portion 7 is reliably reinforced by the reinforcing element 11.
- the number of patch cords to be driven is preferably 2.5 to 5.8 cords / cm in the case of a 5 GPa nylon cord with a 1.2 mm cord diameter, and 3.3 to 5.0 cords / cm. It is more preferable. This is because a more reliable reinforcing effect can be obtained when the number is 2.5 lines / cm or more, and an effect of preventing separation can be more reliably obtained when the number is 5.8 lines / cm or less.
- the ply cord 6 extends radially, so that the reinforcing element 11 is not separated from all the ply cords other than the central ply cord among the three broken ply cords 6a. Become parallel. This form is preferable in that a higher reinforcing effect is obtained than the reinforcing elements 11 are also arranged radially. The crossing relationship between the reinforcing element and the ply cord will be further described later with reference to FIG.
- the patch rubber 10 is preferably formed by laminating a plurality of layers of reinforcing sheets 10a from the viewpoint of the reinforcing effect.
- a nylon cord having a cord diameter of 1.2 mm is used as the reinforcing element 11
- about 4 to 6 layers are preferably laminated from the viewpoint of the reinforcing effect.
- the damaged portion 7 means a portion where the ply cord and the ply rubber of the carcass ply 5a are broken to form a gap.
- the carcass ply 5a (the carcass ply 5a 1 that is the innermost in the tire in the case of a plurality of plies) is seen through from the inside of the tire of the sidewall portion 3.
- an area where two broken cord ends 21, 22, 24, 23 in total, which are the two separated ply cords 6 a 1 , 6 a 2 , among the broken ply cords 6 a are connected in the tire circumferential direction It is defined as a damaged area 8.
- the outermost side in the tire radial direction of the damaged region 6 is the upper side 25 (length x), and the innermost side is the lower side 26 (length y).
- the end portions 13a and 13b of the patch rubber 10 located on the extension line of the upper side 25 are preferably located at a position (x / 2) ⁇ 2 to 4 times from the midpoint P of the upper side 25.
- the position of (x / 2) ⁇ 2 from the midpoint P is indicated by P ′, and the position of (x / 2) ⁇ 4 is indicated by P ′′. Therefore, the end portions 13a and 13b are located between P′P ′′.
- the end portions 14a and 14b of the patch rubber 10 located on the extension line of the lower side 26 are preferably located at a position (y / 2) ⁇ 2 to 4 times from the midpoint Q of the lower side 26.
- the position of (y / 2) ⁇ 2 from the middle point Q is indicated by Q ′
- the position of (y / 2) ⁇ 4 is indicated by Q ′′. Therefore, the end portions 14a and 14b are located between Q′Q ′′.
- the end portions 15a and 15b of the patch rubber 10 located on the straight PQ line are preferably located at a position (z / 2) ⁇ 2 to 4 times from the midpoint M of the line segment PQ (length z). .
- the position of (z / 2) ⁇ 2 from the midpoint M is indicated by A
- the position of (z / 2) ⁇ 4 is indicated by B. Therefore, the end portions 15a and 15b are located between AB.
- the damage area 8 can be more reliably reinforced by making each 2 times or more.
- the reinforcing effect is saturated, and it is an unnecessary area. It takes a lot of work time to complete the repair work. For this reason, it is preferable to apply a patch rubber having a size 2 to 4 times that of the damaged region 8.
- the crossing angle ⁇ of the reinforcing element 11 with respect to the straight line PQ connecting the midpoint P of the upper side 25 and the midpoint Q of the lower side 26 is preferably 0 ° or more and 30 ° or less.
- the straight line PQ is the extending direction of the central ply cord in the broken ply cord 6a.
- the reinforcing element is arranged in parallel with the ply cord, the reinforcing element bears too much tension, which is not preferable.
- ⁇ Even at 0 °, a sufficient reinforcing effect can be obtained by the cross effect of the ply cord and the reinforcing element.
- ⁇ exceeds 30 °, the above-mentioned crossing effect is weakened.
- the crossing angle ⁇ of the reinforcing elements 11 in all the reinforcing sheets is preferably 0 ° or more and 30 ° or less.
- each layer is inclined in the opposite direction with respect to the straight line PQ, for example, + 15 °, ⁇ 15 °, + 15 °,. + 15 °, 0 °, and ⁇ 15 ° may be repeated.
- the reinforcement element for every layer is arrange
- the repair method of the present embodiment can be applied to any radial tire, but is effective when applied to a super-large tire such as a construction vehicle tire that is susceptible to a large side cut and is expensive. Is.
- the patch rubber used in the present invention is not limited to a substantially trapezoidal shape, and the patch rubber in which the ends of the reinforcing elements are present on all the edges is not aligned with the tire radial inner ends of the reinforcing elements in a straight line. Any shape can be used as long as it can be disposed in any position, and any attachment method can be used.
- Embodiment 4 is a repaired radial tire 1 using the repair method described so far.
- FIG. 1 is a half sectional view of the radial tire in the tire width direction. Although most of the description has been made in the first embodiment, the description thereof will be omitted.
- Reference numeral 32 denotes a belt formed of one or more cord rubber coating layers disposed on the outer side in the tire radial direction of the carcass 5. Examples of the cord include a steel cord and an organic fiber cord.
- the reinforcing element 11 is parallel to one tire radial direction R, and at least a part of the inner end in the tire radial direction of the reinforcing element 11 is one tire circumferential line X.
- the patch rubbers are pasted together so that the vertical distances relative to each other are in different positional relationships.
- the structure of the repaired portion of the repaired tire is as described in the first embodiment.
- Embodiment 5 is a patch rubber 10 (FIG. 4) for repairing a radial tire that can be suitably used for the repair method and the repaired tire.
- the patch rubber 10 has at least one reinforcing sheet 10a in which a plurality of reinforcing elements 11 extending in parallel with each other are covered with rubber. And at least one part of the edge part 11a, 11b, 11c of each reinforcement element of at least one side among the both ends of the several reinforcement element 11 has the positional relationship from which the perpendicular direction distance with respect to arbitrary straight lines differs.
- the end portion 11a, the end portion 11b, and the end portion 11c are in a positional relationship with different vertical distances for any virtual straight line. In this way, when the patch rubber 10 is affixed to the damaged portion, the inner end in the tire radial direction of the reinforcing element can be prevented from being aligned, and the repair method of the present invention can be performed.
- the one shown in FIG. 9 may be used.
- a plurality of reinforcing elements 51 extending in parallel with each other at 45 ° are arranged on each side of a square reinforcing sheet 50a.
- the end portions 52a and 52b on the lower side of each reinforcing element do not have the same vertical distance with respect to any virtual straight line.
- a plurality of reinforcing elements 51 that are parallel to the short side and parallel to the short side are provided on the reinforcing sheet 50a having one of the long sides of the rectangle rounded outward. Is arranged.
- each reinforcing element in the drawing do not have the same vertical distance with respect to any virtual straight line.
- a plurality of reinforcing elements 51 that are parallel to the short sides and parallel to the short sides are arranged on the reinforcing sheet 50a having two long sides that are rounded outward.
- the end portions 52 on the lower side of the drawing of each reinforcing element are more preferable because the vertical distances are not uniform with respect to any virtual straight line.
- the patch rubber 10 in FIG. 4 and the patch rubber 50 in FIG. 9A in which the ends of a plurality of reinforcing elements are dispersed on all edges are preferable. This is because it is easy not to apply the patch rubber to unnecessary portions from the viewpoint of the reinforcing effect, and the repair work time can be easily shortened. Moreover, it is because the freedom degree of how to affix on a damaged part is high.
- another object of the present invention is to provide a pneumatic tire capable of shortening the repair time while making it possible to use the tire until its wear life by repairing the damage of the tire due to carcass breakage with a sufficient reinforcing force. Is to provide a repair method.
- a radial tire repair method for achieving the above object includes a tread portion, a pair of sidewall portions extending inward in the tire radial direction from both side portions of the tread portion, and extending inward in the tire radial direction from each sidewall portion. It has a carcass having at least one radial carcass ply that extends in a toroidal shape over the bead portion and is coated with a plurality of ply cords with a ply rubber. At the side wall portion, at least one ply cord is a ply rubber in the carcass ply.
- a method of repairing a radial tire that is broken along with two patch rubbers that are rubber-coated with a plurality of reinforcing elements arranged in parallel to one damaged portion of the carcass ply where the ply cord is broken Remove the side rubber around the damaged part from the outside of the tire on the side wall, The inner liner rubber around the damaged part is removed from the inside of the tire on the sidewall part to expose the end part formed by the breakage of the carcass ply, and the part of the damaged part from which the side rubber and the inner liner rubber have been removed, At least a part of the inner end in the tire radial direction of each of the plurality of reinforcing elements such that the reinforcing element is parallel to one tire radial direction from the inner side and the outer side of the radial tire, respectively
- the patch rubber is arranged so that the vertical distance to one tire circumference is different, and the end portion formed by breakage of the carcass ply is sandwiched and held by the patch rubber. is there.
- the tire repaired by such a method is such that the end portion formed by the breakage of the carcass ply is sandwiched between the two patch rubbers, so that the patch rubber is only applied to the breakage point of the carcass ply.
- the reinforcing strength can be improved, and therefore the tire can be used until the original wear life of the tire is reached without causing the repaired portion to fail again.
- sufficient reinforcement strength by the patch rubber can be obtained, reliable repair is possible even when the damaged portion where the ply cord is continuously broken over three or more is large.
- the reinforcement range size of the patch rubber
- the rigidity of the repaired portion can be made equal to the surrounding rigidity, a failure starting from the end portion of the patch rubber reinforcing element or the end portion of the ply cord formed by breakage occurs.
- the reinforcing elements are arranged so as to be parallel to one tire radial direction, and at least a part of the inner end in the tire radial direction of each of the plurality of reinforcing elements has a vertical distance with respect to one tire circumferential line.
- the size of the patch rubber to be applied from the outer surface side of the tire is larger than the size of the patch rubber to be applied from the inner surface side of the tire.
- one extending direction of the reinforcing element of the patch rubber is set to one of the broken ply cords. It is preferable to match each of the two extending directions.
- the crossing angle of the reinforcing element with respect to the ply cord is 0 ° or more and 30 ° or less.
- reference numeral 101 denotes a pneumatic tire (hereinafter, also referred to as a tire) that is a radial tire that is repaired using a repair method as an example of the present embodiment.
- This tire has a carcass 111 composed of at least one layer of carcass ply 111a in which a plurality of ply cords 109 extending from the bead portion 103 to the tread portion 107 through the sidewall portion 105 are covered with ply rubber.
- the material of the ply cord 109 can be steel or organic fiber, but is not limited thereto. Examples of the material for the ply rubber include natural rubber, synthetic rubber, carbon black, and the like, and the hardness of the rubber can be about 40 to 80.
- the method of repairing the damaged part is demonstrated about the tire 1 in which the side cut accompanied by three fracture
- FIG. 11 shows an example of a patch rubber as a reinforcing cord layer that can be used in the repair method of the present embodiment.
- the patch rubber 113 is composed of at least one reinforcing sheet 113a which is a cord rubber reinforcing layer in which a plurality of reinforcing elements 115 arranged in parallel with each other are covered with rubber, in this case, eight layers.
- the planar shape of the patch rubber is trapezoidal so that part or all of the end of the reinforcing element 115 is not aligned horizontally.
- the number of reinforcing elements 115 can be appropriately changed according to the number of broken ply cords.
- the rubber material covering the reinforcing element 115 can be made of natural rubber, synthetic rubber, carbon black, etc., and the rubber hardness is about 40 to 80, especially the same as the rubber used for the carcass ply 111a. It is preferable to make it.
- the reinforcing element 115 may be a steel cord or an organic fiber cord. In the case of an organic fiber material, a single filament cord or a plurality of cords may be used in addition to a cord obtained by twisting a predetermined number of filament bundles. It is good also as a cord which arranged the filament.
- the damaged portion 117 shown in FIG. 12A using such a patch rubber 113 is repaired.
- the side rubber portion 121 and the inner liner rubber portion 122 adjacent to the inner side and the outer side are removed from the inner surface side and the outer surface side of the tire by buffing or the like so that the cord of the carcass ply 111a is not exposed as much as possible.
- An end portion 119 formed by breaking is exposed.
- the above-described patch rubber 113 is disposed from the inner surface side and the outer surface side of the tire, respectively, and the two patch rubbers 113 sandwich the end portion 119 of the carcass ply 111a formed by breakage.
- the patch rubber 113 is arranged so that one extending direction of the reinforcing element 115 of the patch rubber 113 matches one extending direction of the broken ply cord 109.
- the reinforcing elements 115 are arranged so as to be parallel to one tire radial direction. Further, at least a part of the inner end in the tire radial direction of each of the plurality of reinforcing elements 115 is affixed with a patch rubber so that the distance in the vertical direction with respect to one tire circumferential line is different.
- a new unvulcanized side rubber portion 125 and a new inner liner rubber portion 126 which can be made of the same material as the removed rubber 121, 122, are respectively arranged and filled on the arranged patch rubber 113. Then, each of the filled new side rubber portion 125 and the new inner liner rubber portion 126 is vulcanized.
- the patch rubber 113 before being pasted is also made of unvulcanized rubber and vulcanized together with the vulcanization of the new side rubber portion 125 and the new inner liner rubber portion 126.
- the patch rubber 113 is vulcanized in advance, the vulcanization of the new side rubber portion 125 and the new inner liner rubber portion 126 may cause over-vulcanization. Further, by making the patch rubber 113 unvulcanized before being placed on the tire, the patch rubber 113 can be densely attached to the tire, and mixing or generation of bubbles can be prevented. .
- the trapezoidal shape is adopted as the patch rubber 113, and the reason is as follows. As shown in FIG. 13, the outermost two damaged cords 109a and 109b and the plurality of ply cords 9 are broken in the damaged region 127 (the hatched region) caused by the breaking of the ply cord 109.
- the damaged region 127 has a generally trapezoidal shape, and a patch rubber 113 having a similar shape is pasted to minimize the size of the patch rubber 113 while ensuring a desired reinforcing effect. Because it can.
- the size of the patch rubber 113 to be applied from the outer surface side of the tire is 2 to 4 times the size of the damaged region 127, and the end portion 119 of the ply cord 109 formed by breakage and the patch rubber 113 are used. It is preferable to form an overlap margin 129 (part shown by a matte surface in the drawing) with the peripheral edge of the patch rubber, and the patch rubber 113 may be arranged in alignment with the damaged region 127 so that the overlap margin 129 is formed evenly. More preferred.
- the size of the patch rubber 113 applied from the inner surface side of the tire is 1.1 to 4 times the size of the damaged region 127, and the end portion 119 and the patch rubber of the ply cord 109 formed by breaking It is preferable to form an overlap margin 129 with the peripheral edge of 113, and it is more preferable to arrange the patch rubber 113 in alignment with the damaged region 127 so that the overlap margin 129 is formed evenly. According to this, the two patch rubbers 113 facing each other can surely hold the end portion 119 of the ply cord 109 formed by breakage, and the reinforcing strength by the patch rubber 113 can be reliably increased. .
- the patch rubber 113 When the size of the outer patch rubber 113 is less than twice that of the damaged region 127 or the size of the inner patch rubber 113 is less than 1.1 times that of the damaged region 127, the patch rubber 113 The ply cord 109 has insufficient force to hold the end portion 119 formed by breakage, and if the inner and outer patch rubbers 113 exceed four times the damaged area 127, not only the reinforcement strength becomes excessive, but the work Time also increases.
- the patch rubber 113 attached from the outer surface side of the tire 101 is larger than the patch rubber 113 attached from the inner surface side of the tire 101. This is because the patch rubber 113 affixed from the outer surface side has a higher reinforcing effect than the patch rubber 113 affixed from the inner surface side, and the total size of both patch rubbers 113 can be reduced.
- the arrangement interval d of the reinforcing elements 115 of the patch rubber 113 is preferably narrower than the arrangement interval D of the ply cord 109. According to this, the damaged portion can be effectively reinforced by the patch rubber 113.
- one extending direction of the reinforcing element 115 of the patch rubber 113 is set to one of the broken ply cords 109 (particularly, the ply cord 109 of the ply layer closest to the patch rubber 113). It is preferable to arrange the patch rubber 113 so as to match the two extending directions. According to this, the shear deformation between the cords of the ply cord 109 and the reinforcing element 115 can be suppressed.
- the reinforcing elements of the patch rubber 113 should be arranged in a direction intersecting at an angle of 0 to ⁇ 30 ° with respect to the extending direction of the ply cord 109.
- the crossing angle here refers to the extension direction of the central ply cord 109 among the ply cords 109 to be repaired, or the center line of the two central ply cords 109 when repairing even ply cords 109. It means a crossing angle with the reinforcing element 115.
- the crossing angle of the reinforcing element 115 with respect to the ply cord 109 may be different between the reinforcing sheets 113 a constituting the patch rubber 113. From the bead portion to the hump portion where only the ply cord is damaged, the extending direction of the reinforcing element of the patch rubber to be attached is in the range of 0 to ⁇ 30 ° with respect to the extending direction of the ply cord, As much as possible 0 °.
- Example 1 An off-the-road radial tire (ORR 46 / 90R57) is mounted on an applicable rim as defined in the JATMA standard, and after traveling for 3000 hours at a speed of 8 km / h under conditions of an internal pressure of 700 kPa and a load of 63 t, FIG. As shown in FIG. 4, the side cut which three carcass plies broke was given.
- Carcass ply 1 ply cord: Steel cord ply rubber with a cord diameter of 4.2 mm
- Material Natural rubber A patch rubber is applied in the procedure described in Fig.
- Patch rubber material natural rubber (vulcanized rubber)
- Patch cord Number of cords driven per layer of nylon cord with a cord diameter of 1.2 mm: 4 / cm
- Example 1 The test was performed under the same conditions as in Example 1 except that the rectangular patch rubber shown in FIG. The length of the long side of the rectangle is the same as the length of the long side of the pair of parallel sides of the trapezoid of Example 1.
- Example 2 and Comparative Example 2 The test was performed under the same conditions as in Example 1 and Comparative Example 1 except that the patch rubber before application was made of unvulcanized rubber.
- Examples 3 to 5 The test was performed under the same conditions as in Example 2 except that the shape of the patch rubber was changed to FIGS. 7 (a), (b), and (c).
- the two apexes on the long side are curves with a radius of curvature of 3 mm
- the three apex on the short side are curves with a radius of curvature of 6 mm.
- the long side portion of FIG. 7B is a curve having a curvature radius of 200 mm
- the short side portion is a curve of 100 mm
- Example 6 Tests were performed under the same conditions as in Example 2 except that ⁇ was changed as shown in Table 1 for all three reinforcing elements.
- Example 9 to 12 The test was performed under the same conditions as in Example 2 except that the size of the patch rubber was changed as shown in Table 1.
- Examples 21 to 24 and Comparative Example 20 radial tires were used in which the side wall portion received a side cut, the three ply cords were broken, and there was no difference in the damaged portion.
- a patch rubber having the same shape was applied from the inner and outer surfaces of the tire, and in Comparative Example 20, a repair method was applied in which the patch rubber was applied from the inner surface of the tire.
- the shape of each patch rubber is as follows: Comparative Example 20 in FIG. 14 (a), Example 21 in FIG. 14 (b), Example 22 in FIG. 14 (c), Example 23 in FIG. 24 is shown in FIG. Further, all the patch rubbers were provided with three reinforcing sheet layers so that the overlapping allowance was formed uniformly and the reinforcing elements were arranged in parallel to one of the broken ply cords.
- the durability of the patch rubber that is bonded to the damaged portion of the carcass ply from the inner surface of the tire can be improved, and the service life of the repaired tire can be extended.
- the patch rubber is not attached to an unnecessary portion from the viewpoint of the reinforcing effect, the repair work time can be shortened.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
(1)トレッド部と、該トレッド部の両側部からタイヤ径方向内側に延びる一対のサイドウォール部と、各サイドウォール部からタイヤ径方向内側に延びるビード部とにわたってトロイド状に延び、複数本のプライコードをプライゴムで被覆した少なくとも1枚のラジアルカーカスプライをもつカーカスを有し、前記サイドウォール部において、カーカスプライで少なくとも1本のプライコードがプライゴムとともに破断したラジアルタイヤの修理方法であって、
プライコードが破断したカーカスプライの損傷部分に、タイヤ内面側から、平行に配列された複数本の補強素子をゴム被覆した補強シートを含むパッチラバーを貼り合わせる工程を有し、
前記補強素子が一のタイヤ径方向に対し平行になるように、
かつ、前記複数本の補強素子のそれぞれのタイヤ径方向内側端の少なくとも一部は、一のタイヤ周線に対する垂直方向距離が異なる位置関係にあるように、前記パッチラバーを貼り付けることを特徴とするラジアルタイヤの修理方法。
前記パッチラバーの互いに平行な1組の対辺のうち、長辺がタイヤ径方向外側で、短辺がタイヤ径方向内側で、
該長辺および短辺がタイヤ周方向に沿って延在するように、前記パッチラバーを貼り付ける上記(1)または(2)に記載のラジアルタイヤの修理方法。
該上辺の延長線上に位置する前記パッチラバーの端部が、前記上辺の中点Pから、(x/2)×2~4倍の位置にあり、
該下辺の延長線上に位置する前記パッチラバーの端部が、前記下辺の中点Qから、(y/2)×2~4倍の位置にあり、
直線PQ線上に位置する前記パッチラバーの端部が、線分PQ(長さz)の中点Mから、(z/2)×2~4倍の位置にある、上記(1)乃至(3)のいずれか1項に記載のラジアルタイヤの修理方法。
前記パッチラバーを貼り付ける工程の後、前記損傷部分に対して部分加硫を施す上記(1)乃至(5)のいずれか1項に記載のラジアルタイヤの修理方法。
前記損傷部分周辺のインナーライナーゴムを、前記カーカスプライが露出するまで前記サイドウォール部のタイヤ内方から除去する工程と、の後に、
前記パッチラバーを前記カーカスプライの損傷部分に対して貼り付ける工程、
前記損傷部分の周辺に新たなサイドゴムを、タイヤ外方から充填する工程、を有する上記(1)乃至(6)のいずれか1項に記載のラジアルタイヤの修理方法。
前記損傷部分周辺のサイドゴムを、前記サイドウォール部のタイヤ外方から除去し、
前記損傷部分周辺のインナーライナーゴムを、前記サイドウォール部のタイヤ内方から除去してカーカスプライの、破断により形成された端部を露出させ、
前記損傷部分の、サイドゴムおよびインナーライナーゴムを除去した部分に、前記パッチラバーをラジアルタイヤの内面側および外面側からそれぞれ配置して、該パッチラバーによって、カーカスプライの、破断により形成された端部を挟み込んで保持する上記(1)乃至(6)のいずれか1項に記載のラジアルタイヤの修理方法。
前記サイドウォール部において、カーカスプライで少なくとも1本のプライコードがプライゴムとともに破断しており、
プライコードが破断したカーカスプライの損傷部分に、タイヤ内面側から、平行に配列された複数本の補強素子をゴム被覆した補強シートを含むパッチラバーが貼り合わされており、
前記補強素子が一のタイヤ径方向に対し平行になるように、
かつ、前記複数本の補強素子のそれぞれのタイヤ径方向内側端の少なくとも一部は、一のタイヤ周線に対する垂直方向距離が異なる位置関係にあるように、前記パッチラバーが貼り合わされていることを特徴とする修理済みのラジアルタイヤ。
前記パッチラバーの互いに平行な1組の対辺のうち、長辺がタイヤ径方向外側で、短辺がタイヤ径方向内側で、
該長辺および短辺がタイヤ周方向に沿って延在するように、前記パッチラバーが貼り付けられている上記(13)または(14)に記載の修理済みのラジアルタイヤ。
該上辺の延長線上に位置する前記パッチラバーの端部が、前記上辺の中点Pから、(x/2)×2~4倍の位置にあり、
該下辺の延長線上に位置する前記パッチラバーの端部が、前記下辺の中点Qから、(y/2)×2~4倍の位置にあり、
直線PQ線上に位置する前記パッチラバーの端部が、線分PQ(長さz)の中点Mから、(z/2)×2~4倍の位置にある、上記(13)乃至(15)のいずれか1項に記載のラジアルタイヤ。
互いに平行に延在する複数本の補強素子をゴム被覆した少なくとも1層の補強シートを有し、
前記複数本の補強素子の両端部のうち、少なくとも片側の各補強素子の端部の少なくとも一部は、任意の直線に対する垂直方向距離が異なる位置関係にあることを特徴とするパッチラバー。
まず、本実施形態にかかる修理方法を説明する。図3(a)は、ラジアルタイヤ1がサイドウォール部3において、サイドカットを受け、カーカスプライ5aが破断した状態を示す。図3(a)では、タイヤ内方のインナーライナーまで貫通している。カーカスプライの損傷部分を符号7で示している。
実施形態1では、台形形状のパッチラバー10を貼り付ける例を示したが、パッチラバー10は、完全な台形形状である必要はなく、台形の頂点部分や辺が多少丸みを帯びている略台形形状でも構わない。図7(a)~図7(c)に例を示す。その他の点は、実施形態1と同様である。
また、本発明で用いるパッチラバーは略台形形状に限定されることはなく、全ての縁辺に補強素子の端部が存在するパッチラバーを、補強素子のタイヤ径方向内側端が一直線に揃わないように配置することができれば、どのような形状でもよく、任意の貼り付け方をすることができる。
実施形態4は、これまで説明した修理方法を用いた修理済みラジアルタイヤ1である。図1に、該ラジアルタイヤのタイヤ幅方向の半断面図を示す。大部分は、実施形態1で説明したので説明を省略するが、符号32は、カーカス5のタイヤ径方向外側に配設された、1層以上のコードゴム被覆層からなるベルトである。コードとしては、スチールコードや有機繊維コードが例示できる。
実施形態5は、上記修理方法および修理済みタイヤに好適に用いることができる、ラジアルタイヤを修理するためのパッチラバー10(図4)である。パッチラバー10は、互いに平行に延在する複数本の補強素子11をゴム被覆した少なくとも1層の補強シート10aを有する。そして、複数本の補強素子11の両端部のうち、少なくとも片側の各補強素子の端部11a,11b,11cの少なくとも一部は、任意の直線に対する垂直方向距離が異なる位置関係にある。本実施形態では、どの仮想直線に対しても、端部11a、端部11b、端部11cは垂直方向距離が異なる位置関係にある。このようにすれば、損傷部分にパッチラバー10を貼り付けるにあたり、補強素子のタイヤ径方向内側端が一直線に揃わないようにすることができ、本発明の修理方法を行うことができる。
上述の修理方法のようにタイヤ内面側からのみパッチラバーをカーカスの損傷部分にあてがって補強するものでは損傷部分の補強の強度に不安があるような場合、すなわちプライコードが3本以上に亘って連続して破断したような特に損傷部分が大きな場合には、タイヤ本来の摩耗寿命に達する前に補修箇所が再度故障する虞がある。一方、このような補修方法につき、充分な強度を確保しようとすると、カーカスの損傷部分に対してかなり大きなパッチラバーを貼り付けなければならず、そのために、カーカスの損傷箇所周囲のゴムを広範囲にわたって除去しなければならない上、パッチラバーを覆うカバーゴムも大量に必要となり、作業時間、材料費が大幅に増大することも考えられる。また、補修した部分の剛性がその周囲に比べて低くなる可能性もあるため、パッチラバーの補強素子の端部や破断したプライコードの端部といった剛性の段差が存在する箇所を起点として新たな故障が発生する虞がある。
次に、本発明の効果をさらに明確にするために、以下の実施例および比較例にかかる修理方法を適用した比較評価について説明する。
(実施例1)
オフザロードラジアルタイヤ(ORR 46/90R57)をJATMA規格に定める適用リムに装着し、内圧700kPa、荷重63tの条件の下、速度8km/hで3000時間走行させた後、図3(a)および図4に示すように、カーカスプライ3本が破断するサイドカットを与えた。
カーカスプライ:1枚
プライコード:コード径4.2mmのスチールコード
プライゴムの素材:天然ゴム
図3で説明した手順でパッチラバーを貼り付け、その後損傷部分に対して部分加硫を行って、修理済みラジアルタイヤとした。
パッチラバーの素材:天然ゴム(加硫済みゴム)
パッチコード:コード径1.2mmのナイロンコード
1層あたりのコードの打ち込み本数:4本/cm
パッチラバーは、補強シートを3層積層したものとし、全てのシートにおいて、θ=0°とした。
また、損傷領域とパッチラバーの大きさについて、図6に即して説明すると、損傷領域は、上辺の長さx=25mm、下辺の長さy=23mm、直線PQの長さz=100mmであった。それに対して、パッチラバーの大きさは、符号13a,13b間の長さ=75mm、符号14a,14b間の長さ=46mm、符号AB間の長さ=200mmである。つまり、それぞれの端部は、(x/2)×3倍、(y/2)×2倍、(z/2)×2倍の位置にある。
修理後のタイヤを再度走行させて、パッチラバーの補強素子端部を起点に故障するまでの走行時間を測定した。走行時間が長いほど、パッチラバーの耐久性が高い。結果を表1に示す。
部分加硫する前までの修理にかかった時間を測定した。結果を表1に示す。
図8に示す長方形のパッチラバーを貼り付けて修理した点以外は、実施例1と同様の条件で試験を行った。長方形の長辺の長さは、実施例1の台形で平行な1組の対辺のうち長辺の長さと同じである。
貼り付ける前のパッチラバーが、未加硫のゴムでできている点以外は、実施例1および比較例1と同様の条件で試験を行った。
パッチラバーの形状を図7(a),(b),(c)とした以外は、実施例2と同様の条件で試験を行った。なお、図7において、長辺側の2つの頂点部分は曲率半径3mm、短辺側の3つの頂点部分は曲率半径6mmの曲線である。また、図7(b)の長辺部分は曲率半径200mm、短辺部分は100mm、図7(c)の平行な1組の対辺以外の2辺は、曲率半径100mmの曲線である。
3層全ての補強素子において表1のようにθを変化させた以外は、実施例2と同様の条件で試験を行った。
パッチラバーの大きさを表1のように変化させた以外は、実施例2と同様の条件で試験を行った。
次に本発明の実施形態6従う修理方法を適用した修理済みタイヤを試作し、性能評価を行ったので以下で説明する。実施例21~24および比較例20で使用するタイヤはいずれも、オフザロードラジアルタイヤ(ORR 46/90R57)である。
2 トレッド部
3 サイドウォール部
4 ビード部
5 カーカス
5a カーカスプライ
6 プライコード
6a 破断したプライコード
7 損傷部分
8 損傷領域
10 パッチラバー
10a 補強シート
11 補強素子
11a,11b,11c 補強素子のタイヤ径方向内側端
30 損傷部周辺のサイドゴム部分
31 損傷部分周辺のインナーライナーゴム部分
32 ベルト
33 新たなサイドゴム部分
34 新たなインナーライナーゴム部分
101 ラジアルタイヤ
103 ビード部
105 サイドウォール部
107 トレッド部
109 プライコード
111 カーカス
111a カーカスプライ
113 パッチラバー
113a 補強シート
115 補強素子
117 損傷部分
119 プライコードの端部
121 損傷部周辺のサイドゴム部分
122 損傷部周辺のインナーライナーゴム部分
123 凹部
125 新たなサイドゴム部分
126 新たなインナーライナーゴム部分
127 損傷領域
129 重ね代
Claims (19)
- トレッド部と、該トレッド部の両側部からタイヤ径方向内側に延びる一対のサイドウォール部と、各サイドウォール部からタイヤ径方向内側に延びるビード部とにわたってトロイド状に延び、複数本のプライコードをプライゴムで被覆した少なくとも1枚のラジアルカーカスプライをもつカーカスを有し、前記サイドウォール部において、カーカスプライで少なくとも1本のプライコードがプライゴムとともに破断したラジアルタイヤの修理方法であって、
プライコードが破断したカーカスプライの損傷部分に、タイヤ内面側から、平行に配列された複数本の補強素子をゴム被覆した補強シートを含むパッチラバーを貼り合わせる工程を有し、
前記補強素子が一のタイヤ径方向に対し平行になるように、
かつ、前記複数本の補強素子のそれぞれのタイヤ径方向内側端の少なくとも一部は、一のタイヤ周線に対する垂直方向距離が異なる位置関係にあるように、前記パッチラバーを貼り付けることを特徴とするラジアルタイヤの修理方法。 - 前記補強素子の配列間隔が、プライコードの配列間隔よりも狭い請求項1に記載のラジアルタイヤの修理方法。
- 前記パッチラバーが略台形形状であり、
前記パッチラバーの互いに平行な1組の対辺のうち、長辺がタイヤ径方向外側で、短辺がタイヤ径方向内側で、
該長辺および短辺がタイヤ周方向に沿って延在するように、前記パッチラバーを貼り付ける請求項1または2に記載のラジアルタイヤの修理方法。 - 前記サイドウォール部のタイヤ内方から、最もタイヤ内方にあるカーカスプライを透視した平面視にて、破断したプライコードのうち最もタイヤ周方向に離れている2本のプライコードの計4つの破断コード端部を結んだ領域を損傷領域と定義し、該損傷領域のタイヤ径方向最外側を上辺(長さx)、最内側を下辺(長さy)としたとき、
該上辺の延長線上に位置する前記パッチラバーの端部が、前記上辺の中点Pから、(x/2)×2~4倍の位置にあり、
該下辺の延長線上に位置する前記パッチラバーの端部が、前記下辺の中点Qから、(y/2)×2~4倍の位置にあり、
直線PQ線上に位置する前記パッチラバーの端部が、線分PQ(長さz)の中点Mから、(z/2)×2~4倍の位置にある、請求項1乃至3のいずれか1項に記載のラジアルタイヤの修理方法。 - 前記上辺の中点Pおよび前記下辺の中点Qを結ぶ直線PQに対する、全ての補強シートにおける補強素子の交差角度が、それぞれ0°以上30°以下である請求項4に記載のラジアルタイヤの修理方法。
- 前記パッチラバーが、未加硫のゴムからなり、
前記パッチラバーを貼り付ける工程の後、前記損傷部分に対して部分加硫を施す請求項1乃至5のいずれか1項に記載のラジアルタイヤの修理方法。 - 前記損傷部分周辺のサイドゴムを、前記カーカスプライが露出するまで前記サイドウォール部のタイヤ外方から除去する工程と、
前記損傷部分周辺のインナーライナーゴムを、前記カーカスプライが露出するまで前記サイドウォール部のタイヤ内方から除去する工程と、の後に、
前記パッチラバーを前記カーカスプライの損傷部分に対して貼り付ける工程、
前記損傷部分の周辺に新たなサイドゴムを、タイヤ外方から充填する工程、を有する請求項1乃至6のいずれか1項に記載のラジアルタイヤの修理方法。 - 前記パッチラバーを、前記損傷部分一つに対して2枚用意し、
前記損傷部分周辺のサイドゴムを、前記サイドウォール部のタイヤ外方から除去し、
前記損傷部分周辺のインナーライナーゴムを、前記サイドウォール部のタイヤ内方から除去してカーカスプライの、破断により形成された端部を露出させ、
前記損傷部分の、サイドゴムおよびインナーライナーゴムを除去した部分に、前記パッチラバーをラジアルタイヤの内面側および外面側からそれぞれ配置して、該パッチラバーによって、カーカスプライの、破断により形成された端部を挟み込んで保持する請求項1乃至6のいずれか1項に記載のラジアルタイヤの修理方法。 - ラジアルタイヤの外面側から配置する前記パッチラバーの大きさをラジアルタイヤの内面側から配置する前記パッチラバーの大きさよりも大とする、請求項8に記載のラジアルタイヤの修理方法。
- ラジアルタイヤの内面側および外面側から、前記パッチラバーをそれぞれ配置するにあたり、前記パッチラバーの補強素子の一の延在方向を、破断したプライコードの一の延在方向にそれぞれ一致させる、請求項8または9に記載のラジアルタイヤの修理方法。
- 前記パッチラバーの各補強素子の、プライコードに対する交差角度を、それぞれ0°以上30°以下とした、請求項8乃至10のいずれか1項に記載のラジアルタイヤの修理方法。
- 請求項8乃至11のいずれか1項に記載の修理方法により修理したラジアルタイヤ。
- トレッド部と、該トレッド部の両側部からタイヤ径方向内側に延びる一対のサイドウォール部と、各サイドウォール部からタイヤ径方向内側に延びるビード部とにわたってトロイド状に延び、複数本のプライコードをプライゴムで被覆した少なくとも1枚のラジアルカーカスプライをもつカーカスを有するラジアルタイヤであって、
前記サイドウォール部において、カーカスプライで少なくとも1本のプライコードがプライゴムとともに破断しており、
プライコードが破断したカーカスプライの損傷部分に、タイヤ内面側から、平行に配列された複数本の補強素子をゴム被覆した補強シートを含むパッチラバーが貼り合わされており、
前記補強素子が一のタイヤ径方向に対し平行になるように、
かつ、前記複数本の補強素子のそれぞれのタイヤ径方向内側端の少なくとも一部は、一のタイヤ周線に対する垂直方向距離が異なる位置関係にあるように、前記パッチラバーが貼り合わされていることを特徴とする修理済みのラジアルタイヤ。 - 前記補強素子の配列間隔が、プライコードの配列間隔よりも狭い請求項13に記載の修理済みのラジアルタイヤ。
- 前記パッチラバーが略台形形状であり、
前記パッチラバーの互いに平行な1組の対辺のうち、長辺がタイヤ径方向外側で、短辺がタイヤ径方向内側で、
該長辺および短辺がタイヤ周方向に沿って延在するように、前記パッチラバーが貼り付けられている請求項13または14に記載の修理済みのラジアルタイヤ。 - 前記サイドウォール部のタイヤ内方から、最もタイヤ内方にあるカーカスプライを透視した平面視にて、破断したプライコードのうち最もタイヤ周方向に離れている2本のプライコードの計4つの破断コード端部を結んだ領域を損傷領域と定義し、該損傷領域のタイヤ径方向最外側を上辺(長さx)、最内側を下辺(長さy)としたとき、
該上辺の延長線上に位置する前記パッチラバーの端部が、前記上辺の中点Pから、(x/2)×2~4倍の位置にあり、
該下辺の延長線上に位置する前記パッチラバーの端部が、前記下辺の中点Qから、(y/2)×2~4倍の位置にあり、
直線PQ線上に位置する前記パッチラバーの端部が、線分PQ(長さz)の中点Mから、(z/2)×2~4倍の位置にある、請求項13乃至15のいずれか1項に記載のラジアルタイヤ。 - 前記上辺の中点Pおよび前記下辺の中点Qを結ぶ直線PQに対する、全ての補強シートにおける補強素子の交差角度が、それぞれ0°以上30°以下である請求項16に記載のラジアルタイヤ。
- ラジアルタイヤを修理するためのパッチラバーであって、
互いに平行に延在する複数本の補強素子をゴム被覆した少なくとも1層の補強シートを有し、
前記複数本の補強素子の両端部のうち、少なくとも片側の各補強素子の端部の少なくとも一部は、任意の直線に対する垂直方向距離が異なる位置関係にあることを特徴とするパッチラバー。 - 前記複数本の補強素子の端部が全ての縁辺に分散して存在する請求項18に記載のパッチラバー。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011319290A AU2011319290B2 (en) | 2010-10-22 | 2011-10-24 | Method for repairing radial tire, repaired radial tire, and patch rubber |
RU2013123365/11A RU2522533C1 (ru) | 2010-10-22 | 2011-10-24 | Способ ремонта радиальной шины, отремонтированная радиальная шина и резиновая заплата |
CA2815468A CA2815468C (en) | 2010-10-22 | 2011-10-24 | Method for repairing radial tire, repaired radial tire, and patch rubber |
JP2012539614A JP5657017B2 (ja) | 2010-10-22 | 2011-10-24 | ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー |
CN201180051034.8A CN103167947B (zh) | 2010-10-22 | 2011-10-24 | 子午线轮胎的修补方法、修补后的子午线轮胎和补片橡胶 |
US13/879,263 US10046529B2 (en) | 2010-10-22 | 2011-10-24 | Method for repairing radial tire, repaired radial tire, and patch rubber |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-237818 | 2010-10-22 | ||
JP2010237818 | 2010-10-22 | ||
JP2010-239510 | 2010-10-26 | ||
JP2010239510 | 2010-10-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012053226A1 true WO2012053226A1 (ja) | 2012-04-26 |
Family
ID=45974955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/005941 WO2012053226A1 (ja) | 2010-10-22 | 2011-10-24 | ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー |
Country Status (7)
Country | Link |
---|---|
US (1) | US10046529B2 (ja) |
JP (1) | JP5657017B2 (ja) |
CN (1) | CN103167947B (ja) |
AU (1) | AU2011319290B2 (ja) |
CA (1) | CA2815468C (ja) |
RU (1) | RU2522533C1 (ja) |
WO (1) | WO2012053226A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103847113A (zh) * | 2012-11-30 | 2014-06-11 | 风神轮胎股份有限公司 | 一种无内胎的成品外胎的胎里露线修补方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5657017B2 (ja) | 2010-10-22 | 2015-01-21 | 株式会社ブリヂストン | ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー |
JP5837851B2 (ja) * | 2012-04-24 | 2015-12-24 | 株式会社ブリヂストン | 空気入りタイヤ内面への電子部品取付構造 |
CN104985837A (zh) * | 2015-07-21 | 2015-10-21 | 朱学良 | 一种子午线轮胎硬伤修补方法 |
US11084233B2 (en) * | 2016-06-09 | 2021-08-10 | Bridgestone Corporation | Tire repair method |
JP6946143B2 (ja) * | 2017-10-17 | 2021-10-06 | 三菱重工業株式会社 | 修理パッチ、修理パッチの成形方法、複合材の修理方法及び成形治具 |
CN114755257B (zh) * | 2022-04-21 | 2023-08-08 | 中策橡胶集团股份有限公司 | 一种使用差示扫描量热仪测试电子辐照胎体帘布预交联的方法和设备 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02162029A (ja) * | 1988-07-27 | 1990-06-21 | Rfp Srl | パッチラバー及びその製造方法 |
JPH08244124A (ja) * | 1995-03-10 | 1996-09-24 | Bridgestone Corp | チューブレス空気入りタイヤ修理用パッチ |
JPH1110746A (ja) * | 1997-06-27 | 1999-01-19 | Bridgestone Corp | ラジアルタイヤの修理方法 |
JP2000512230A (ja) * | 1996-06-18 | 2000-09-19 | シュタールグルーバー オットー グルーバー ゲーエムベーハー ウント カンパニー | 空気タイヤ用修繕パッチ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1342202A (fr) * | 1962-09-15 | 1963-11-08 | Michelin & Cie | Perfectionnements à la réparation des enveloppes de pneumatiques |
US3133585A (en) * | 1962-11-05 | 1964-05-19 | Us Rubber Co | Tire repair patch |
US4333508A (en) * | 1981-06-01 | 1982-06-08 | Dirocco Jobbie | Tire repair patch for sidewall and bead repairs |
IT1213622B (it) | 1987-01-21 | 1989-12-29 | Rfp Srl | Toppa trapezoidale per riparare rotture delle corde matalliche sui fianchi dei copertoni dei pneumatici radiali senza camera d'aria |
US6247514B1 (en) * | 1994-12-20 | 2001-06-19 | The Goodyear Tire & Rubber Company | Tires with high strength reinforcement |
EP2219854B1 (en) * | 2007-11-09 | 2016-03-23 | Compagnie Générale des Etablissements Michelin | Repair patch for radial tires |
JP5378509B2 (ja) * | 2008-06-27 | 2013-12-25 | ミシュラン ルシェルシュ エ テクニーク ソシエテ アノニム | 互い違いの端部を備えた補強材を有するパッチ |
CN102076486A (zh) * | 2008-06-27 | 2011-05-25 | 米其林研究和技术股份有限公司 | 综合轮胎部段修补 |
CN102076512B (zh) * | 2008-06-30 | 2014-11-12 | 米其林研究和技术股份有限公司 | 具有与轮胎不连续接合件的补片 |
JP5657017B2 (ja) | 2010-10-22 | 2015-01-21 | 株式会社ブリヂストン | ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー |
-
2011
- 2011-10-24 JP JP2012539614A patent/JP5657017B2/ja active Active
- 2011-10-24 US US13/879,263 patent/US10046529B2/en active Active
- 2011-10-24 RU RU2013123365/11A patent/RU2522533C1/ru active
- 2011-10-24 AU AU2011319290A patent/AU2011319290B2/en active Active
- 2011-10-24 CN CN201180051034.8A patent/CN103167947B/zh active Active
- 2011-10-24 CA CA2815468A patent/CA2815468C/en active Active
- 2011-10-24 WO PCT/JP2011/005941 patent/WO2012053226A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02162029A (ja) * | 1988-07-27 | 1990-06-21 | Rfp Srl | パッチラバー及びその製造方法 |
JPH08244124A (ja) * | 1995-03-10 | 1996-09-24 | Bridgestone Corp | チューブレス空気入りタイヤ修理用パッチ |
JP2000512230A (ja) * | 1996-06-18 | 2000-09-19 | シュタールグルーバー オットー グルーバー ゲーエムベーハー ウント カンパニー | 空気タイヤ用修繕パッチ |
JPH1110746A (ja) * | 1997-06-27 | 1999-01-19 | Bridgestone Corp | ラジアルタイヤの修理方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103847113A (zh) * | 2012-11-30 | 2014-06-11 | 风神轮胎股份有限公司 | 一种无内胎的成品外胎的胎里露线修补方法 |
Also Published As
Publication number | Publication date |
---|---|
RU2522533C1 (ru) | 2014-07-20 |
US10046529B2 (en) | 2018-08-14 |
AU2011319290A1 (en) | 2013-05-02 |
CA2815468A1 (en) | 2012-04-26 |
CN103167947B (zh) | 2015-08-05 |
JPWO2012053226A1 (ja) | 2014-02-24 |
JP5657017B2 (ja) | 2015-01-21 |
CN103167947A (zh) | 2013-06-19 |
CA2815468C (en) | 2015-12-22 |
AU2011319290B2 (en) | 2015-03-12 |
US20130220503A1 (en) | 2013-08-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5657017B2 (ja) | ラジアルタイヤの修理方法、修理済みラジアルタイヤおよびパッチラバー | |
JP5769739B2 (ja) | ラジアルタイヤの修理用パッチラバー、およびそれを用いたラジアルタイヤの修理方法、並びに修理済みラジアルタイヤ | |
EP3459763B1 (en) | Tire | |
JP2008126747A (ja) | 空気入りタイヤ | |
US8714219B2 (en) | Integrated tire section repair | |
JP2007045334A (ja) | 重荷重用偏平空気入りラジアルタイヤ | |
CA1335560C (en) | Method to improve the endurance and reliability of patch-rubbers and of tires repaired or retreaded by means of the same patch-rubbers | |
WO2015125387A1 (ja) | ランフラットタイヤ | |
JP4112079B2 (ja) | 空気入りラジアルタイヤ | |
JPH05310013A (ja) | ランフラット空気入りラジアルタイヤ | |
CN102076511B (zh) | 用于轮胎修复的损坏增强件的端部准备 | |
JP6660254B2 (ja) | タイヤの修理方法および修理済みタイヤ | |
JP3817372B2 (ja) | 建設車両用空気入りラジアルタイヤ | |
JP2018030529A (ja) | 空気入りタイヤ | |
JP2003231403A (ja) | 空気入りタイヤ | |
JP2004314886A (ja) | ゴム補強体及びそれを用いた空気入りタイヤ | |
JPH0592701A (ja) | 重荷重車両用ラジアルタイヤ | |
JP2019217819A (ja) | 空気入りタイヤ | |
JP2008080993A (ja) | 空気入りタイヤ | |
JP2001213115A (ja) | 空気入りラジアルタイヤ | |
JP6805544B2 (ja) | 更生タイヤ | |
JP5211501B2 (ja) | 空気入りタイヤ | |
JP2017114452A (ja) | 空気入りタイヤ | |
JP4444672B2 (ja) | 空気入りタイヤ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11834072 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2012539614 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2815468 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2011319290 Country of ref document: AU Date of ref document: 20111024 Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13879263 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2013123365 Country of ref document: RU Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11834072 Country of ref document: EP Kind code of ref document: A1 |