JP2011245880A - Retreaded tire and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retreaded tire enabling accurate alignment of a precure tread relative to a base tire and enhancing joint strength between the base tire and the precure tread, and to provide a method of manufacturing the same.SOLUTION: In the retreaded tire, the belt-like precure tread 2 is wound relative to the base tire 1 in which a tread part 11 is ground via a rubber layer 3 for adhesion. At least at one place in a tire width direction of the ground tread part 11 of the base tire 1, a protruded part 4 (or a recessed part) extending in a tire circumferential direction is formed. Meanwhile, in a back face part positioned on the base tire side of the precure tread 2, a recessed part 5 (or a protruded part) engaged with the protruded part 4 (or the recessed part) of the base tire 1 is formed.

Description

  The present invention relates to a retread tire using a precure tread and a method for manufacturing the same, and more particularly, enables precise alignment of the precure tread with respect to a pedestal tire, and the tyre tire and the precure tread. The present invention relates to a retreaded tire and a method for manufacturing the same, which can increase the bonding strength between them.

  As a method of rehabilitating used tires, a pre-cured belt-shaped pre-cured tread is wound around an adhesive rubber layer and joined to a base tire whose tread portion has been polished. (For example, see Patent Documents 1 and 2). Such a precure tread type rehabilitation method is advantageous in that the rehabilitation equipment is not complicated and the rehabilitation work can be easily performed.

  However, in the precure tread type rehabilitation method, when the belt-like precure tread is attached to the pedestal tire, it is difficult to align the precure tread with the pedestal tire, and the center positions of both may be shifted. Further, in the retread tire obtained by the precure tread type retreading method, it is required to increase the bonding strength between the base tire and the precure tread and more reliably prevent the precure tread separation. .

JP 2000-79641 A JP 2005-111010 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a retreaded tire and a manufacturing method thereof capable of accurately aligning a precure tread with respect to a pedestal tire and increasing the bonding strength between the pedestal tire and the precure tread. It is to provide a method.

  To achieve the above object, the retread tire of the present invention is a retread tire in which a belt-shaped precure tread is wound around a base tire having a tread portion polished through an adhesive rubber layer. A convex portion or a concave portion extending in the tire circumferential direction is formed in at least one portion of the tread portion in the tire width direction, while the convex portion of the base tire is formed on the back portion of the precure tread on the base tire side. Or the convex part or recessed part which meshes with a recessed part was formed, It is characterized by the above-mentioned.

  In addition, the method for producing a retread tire according to the present invention for achieving the above object is to form a base tire by polishing a tread portion of a used tire, and at least the tire tread portion of the base tire in the tire width direction is polished. While forming a convex portion or a concave portion extending in the tire circumferential direction at one place, a convex portion engaging with the convex portion or the concave portion of the base tire on the back surface portion located on the base tire side of the belt-shaped precure tread or A concave portion is formed, and the convex portion or concave portion of the base tire and the convex portion or concave portion of the precure tread are meshed with each other when the precure tread is wound around the pedestal tire via an adhesive rubber layer. It is characterized by this.

  In the present invention, when manufacturing a retread tire in which a belt-shaped precure tread is wound around a base tire via an adhesive rubber layer, the tire is provided at least at one place in the tire width direction of the polished tread portion of the base tire. While forming the convex part or concave part extending in the circumferential direction, by forming the convex part or concave part meshing with the convex part or concave part of the base tire on the back part located on the base tire side of the precure tread, Precure tread alignment with the base tire can be performed with high accuracy. In addition, if the base tire and the precure tread are each provided with a convex part or a concave part, the contact area will increase, so that the bonding strength between the base tire and the precure tread can be increased and extended. Can more reliably prevent precure tread separation.

  In this invention, it is preferable that the dimension of the tire radial direction of a convex part or a recessed part shall be 2 mm-6 mm. Moreover, it is preferable to make the dimension of a convex part or a recessed part the tire width direction larger than the dimension of a tire radial direction. Thereby, alignment of the precure tread with respect to a base tire can be performed accurately.

  The convex portion or the concave portion is preferably disposed within a range of 90% closer to the center with respect to the width of the back portion of the precure tread. Thereby, alignment of the precure tread with respect to a base tire can be performed accurately. However, when the convex portion or the concave portion is arranged outside the range of 70% near the center and within the range of 90% near the center with respect to the width of the back portion of the precure tread, the convex portion is arranged on the pedestal tire side, It is preferable to arrange a recess on the tread side. That is, the belt layer is embedded in the base tire, and the edge portion of the belt layer exists in the shoulder region of the base tire. Therefore, when the convex portion or the concave portion is arranged in such a region, Protrusions should be provided instead of recesses.

It is a meridian half section view showing a retread tire which consists of an embodiment of the present invention. It is meridian sectional drawing which shows the manufacturing method of the retread tire which consists of embodiment of this invention. It is sectional drawing which expands and shows the principal part of FIG. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of other embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention. It is meridian sectional drawing which shows the manufacturing method of the retreaded tire which consists of further another embodiment of this invention.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a retread tire according to an embodiment of the present invention.

  In FIG. 1, a base tire 1 is formed by polishing (buffing) a tread portion of a used tire, 11 is a tread portion, 12 is a sidewall portion, and 13 is a bead portion. A precure tread 2 is wound around and joined to the base tire 1 with the tread portion 11 polished on the outer periphery of the tread portion 11 via an adhesive rubber layer 3.

  The precure tread 2 is a strip having a length corresponding to the tire outer peripheral length before being bonded to the base tire 1, and is vulcanized prior to rehabilitation work. A plurality of grooves 21 are formed on the tread surface of the precure tread 2. The precure tread 2 can be provided with an arbitrary groove pattern.

  In the retread tire, a convex portion 4 extending in the tire circumferential direction is formed at the center position in the tire width direction of the polished tread portion 11 of the base tire 1. On the other hand, a concave portion 5 that meshes with the convex portion 4 of the base tire 1 is formed on the back surface portion of the precure tread 2 that is located on the base tire side.

  When manufacturing the above-described retreaded tire, as shown in FIG. 2, first, the tread portion of the used tire is polished to form the base tire 1, and the tire width direction of the ground tread portion 11 of the base tire 1 is polished. A convex portion 4 extending in the tire circumferential direction is formed at the center position of the tire. On the other hand, a concave portion 5 that meshes with the convex portion 4 of the base tire 1 is formed in advance on the back surface portion of the belt-shaped precure tread 2 located on the base tire side. When the precure tread 2 is wound around the base tire 1 via the adhesive rubber layer 3, the convex portion 4 of the base tire 1 and the concave portion 5 of the precure tread 2 are engaged with each other. After the precure tread 2 is joined to the base tire 1 in this way, the rehabilitation work is completed by vulcanizing the rubber layer 3 for adhesion.

  According to the above embodiment, the convex portion 4 extending in the tire circumferential direction is formed in at least one place in the tire width direction of the polished tread portion 11 of the base tire 1, while the base tire side of the precure tread 2 is formed. Since the recessed part 5 which meshes with the convex part 4 of the base tire 1 is formed in the back surface part which is located in, the position of the precure tread 2 with respect to the base tire 1 can be accurately performed. And since the contact area of the base tire 1 and the precure tread 2 will increase by presence of the convex part 4 and the recessed part 5, the joint strength between both will be raised and the separation of the precure tread 2 will be prevented more reliably. be able to.

  In the retreaded tire, as shown in FIG. 3, the dimension (height or depth) H of the convex portion 4 and the concave portion 5 is set in the range of 2 mm to 6 mm, more preferably in the range of 3 mm to 5 mm. Has been. Thereby, alignment of the precure tread 2 with respect to the base tire 1 can be performed accurately. If the dimension H in the tire radial direction of the convex portion 4 and the concave portion 5 is less than 2 mm, it becomes difficult to mesh the convex portion 4 and the concave portion 5, and conversely if it exceeds 6 mm, the tread portion 11 of the base tire 1 during polishing. It becomes difficult to ensure the thickness of the.

  The dimension (width) W in the tire width direction of the convex part 4 and the concave part 5 is set larger than the dimension in the tire radial direction. Thereby, alignment of the precure tread 2 with respect to the base tire 1 can be performed accurately. Here, when the dimensional relationship is reversed, the convex portion 4 is likely to fall down when the precure tread 2 is bonded to the base tire 1, so that it is difficult to improve the alignment accuracy.

  The convex portion 4 and the concave portion 5 are preferably disposed within a range of 90% closer to the center with respect to the width L of the back portion of the precure tread 2 measured in the tire width direction. Thereby, alignment of the precure tread 2 with respect to the base tire 1 can be performed accurately. That is, since the buff surface of the base tire 1 is generally processed into a curved shape in the shoulder region in the meridian cross section, if the convex portions 4 and the concave portions 5 are arranged in such a curved region, it is difficult to improve the alignment accuracy. . On the other hand, the alignment accuracy can be increased by arranging the convex portions 4 and the concave portions 5 in a linear region within a range of 90% closer to the center with respect to the width L of the back portion of the precure tread 2.

  In addition, when arrange | positioning the convex part 4 and the recessed part 5 outside the range of 70% near center with respect to the width | variety L of the back part of the precure tread 2, and within the range of 90% near center, the convex part 4 on the base tire 1 side. It is good to arrange | position the recessed part 5 in the precure tread 2 side. That is, a belt layer (not shown) is embedded in the base tire 1, and the edge portion of the belt layer is present in the shoulder region of the base tire 1, so that the convex portion 4 and the concave portion 5 are arranged in such a region. When doing so, the convex part 4 is provided in the base tire 1 side.

  The convex portions 4 and the concave portions 5 described above are preferably formed continuously along the tire circumferential direction, but may be discontinuously arranged along the tire circumferential direction. For example, when the convex part 4 is formed discontinuously along the tire circumferential direction while the concave part 5 is continuously formed along the tire circumferential direction, alignment can be performed without causing any inconvenience. In that case, the convex part 4 may be a dimple. Further, the convex portion 4 and the concave portion 5 may meander along the tire circumferential direction.

  Although the convex part 4 and the concave part 5 need to be provided in at least one place in the tire width direction of the polished tread part 11 of the base tire 1, the number and positions of the convex part 4 and the concave part 5 can be arbitrarily selected.

  4 to 17 show still another embodiment of the present invention. In FIG. 4, one convex portion 4 having a semicircular shape in a sectional view is formed at the center position in the tire width direction of the tread portion 11 of the base tire 1, and the convex portion of the base tire 1 is formed on the back surface of the precure tread 2. One concave portion 5 that meshes with the portion 4 is formed.

  In FIG. 5, one convex portion 4 that is rectangular in a sectional view is formed at the center position in the tire width direction of the tread portion 11 of the base tire 1, and the convex portion of the base tire 1 is formed on the back surface of the precure tread 2. One recess 5 that meshes with 4 is formed. The convex part 4 of FIG. 5 is wider than that of FIG.

  In FIG. 6, two convex portions 4 having a rectangular shape in a cross-sectional view are formed at a position deviated from the center position in the tire width direction of the tread portion 11 of the base tire 1 to both sides, and the back portion of the precure tread 2 is formed. Are formed with two concave portions 5 which mesh with the convex portions 4 of the base tire 1.

  In FIG. 7, two convex portions 4 having a semicircular shape in a cross-sectional view are formed at a position shifted from the center position in the tire width direction of the tread portion 11 of the base tire 1 to both sides, and the back surface of the precure tread 2 is formed. Two concave portions 5 that mesh with the convex portions 4 of the base tire 1 are formed in the portion.

  In FIG. 8, one concave portion 5 having a rectangular shape in a cross-sectional view is formed at the center position in the tire width direction of the tread portion 11 of the base tire 1, and the concave portion 5 of the base tire 1 is formed on the back surface of the precure tread 2. One convex part 4 which meshes with each other is formed.

  In FIG. 9, one concave portion 5 having a semicircular shape in a sectional view is formed at the center position in the tire width direction of the tread portion 11 of the base tire 1, and the concave portion 5 of the base tire 1 is formed on the back surface portion of the precure tread 2. One convex portion 4 that meshes with the other is formed.

  In FIG. 10, two concave portions 5 having a rectangular shape in a cross-sectional view are formed at positions shifted from the center position in the tire width direction of the tread portion 11 of the base tire 1 to both sides, and are formed on the back portion of the precure tread 2. Are formed with two convex portions 4 that mesh with the concave portion 5 of the base tire 1.

  In FIG. 11, two concave portions 5 having a semicircular shape in a cross-sectional view are formed at positions shifted from the center position in the tire width direction of the tread portion 11 of the base tire 1 by equal distances on both sides, and the back portion of the precure tread 2 is formed. Are formed with two convex portions 4 that mesh with the concave portion 5 of the base tire 1.

  In FIG. 12, at the center position in the tire width direction of the tread portion 11 of the base tire 1 and at a position deviated from the center position at equal distances to each other, three concave portions 5 having a rectangular shape in cross section are formed, and the precure tread 2 Three convex portions 4 that mesh with the concave portions 5 of the base tire 1 are formed on the back surface portion of the tire.

  In FIG. 13, three concave portions 5 having a semicircular shape in a cross-sectional view are formed at the center position in the tire width direction of the tread portion 11 of the base tire 1 and at a position shifted from the center position to both sides by equal distances. Two convex portions 4 that mesh with the concave portions 5 of the base tire 1 are formed on the back surface portion of 2.

  In FIG. 14, two convex portions 4 having a semicircular shape or a rectangular shape in cross-sectional view are formed at positions shifted from the center position in the tire width direction of the tread portion 11 of the base tire 1 to the both sides. Two concave portions 5 that mesh with the convex portions 4 of the base tire 1 are formed in the portion.

  In FIG. 15, a single concave portion 5 having a semicircular shape in a cross-sectional view is formed at the center position in the tire width direction of the tread portion 11 of the base tire 1, and at a position shifted from the center position to one side in a cross-sectional view. A convex portion 4 having a rectangular shape is formed, and a concave portion 5 and a convex portion 4 that are respectively meshed with the convex portion 4 and the concave portion 5 of the base tire 1 are formed on the back surface portion of the precure tread 2. ing.

  In FIG. 16, one convex portion 4 having a rectangular shape in a cross-sectional view is formed at a position shifted from the center position in the tire width direction of the tread portion 11 of the base tire 1 to the one side, and on the back portion of the precure tread 2 One concave portion 5 that meshes with the convex portion 4 of the base tire 1 is formed.

  In FIG. 17, a single concave portion 5 having a semicircular shape in a cross-sectional view is formed at a position deviated from the center position in the tire width direction of the tread portion 11 of the base tire 1 in the cross-sectional view. One convex portion 4 that meshes with the concave portion 5 of the base tire 1 is formed.

  In addition, in embodiment of FIGS. 14-17, the direction at the time of bonding the base tire 1 and the precure tread 2 is specified. Therefore, it is effective when the precure tread 2 having a groove pattern having directionality or a groove pattern in which the mounting direction with respect to the vehicle is specified is bonded to the corresponding base tire 1.

  When renewing used tires of tire size 11R22.5 by the pre-cured tread system, the structures of the base tire and the pre-cured tread are changed as shown in Table 1, so that the regenerated tires of the conventional example and Examples 1 to 4 can be obtained. Obtained.

  In Examples 1 and 2, while forming a convex portion extending in the tire circumferential direction at the center position in the tire width direction of the polished tread portion of the base tire, the back surface located on the base tire side of the precure tread A concave portion that meshes with the convex portion of the base tire is formed on the base tire, and when the precure tread is wound around the base tire via the adhesive rubber layer, the convex portion of the base tire and the concave portion of the precure tread are mutually connected. I meshed.

  In Examples 3-4, while forming the recessed part extended in a tire peripheral direction in the center position of the tire width direction of the grind | polished tread part of a base tire, the back part located in the base tire side of a precure tread Are formed on the base tire, and when the precure tread is wound around the base tire via an adhesive rubber layer, the base tire concave part and the precure tread convex part are engaged with each other. Combined.

  In the conventional example, the precure tread was wound around the base tire through the rubber layer for adhesion without providing the convex portions and the concave portions as described above.

  For these test tires, the off-center maximum value was measured by the following measurement method, and the results are also shown in Table 1.

Off-center maximum:
Each test tire after retread was cut at 10 points on the circumference, and the amount of deviation of the center position of the precure tread from the center position of the base tire was measured at each cut point, and the maximum off-center value was obtained.

  As is clear from Table 1, the tires of Examples 1 to 4 had a small off-center maximum value between the base tire and the precure tread in comparison with the conventional example. Moreover, in the tires of Examples 1 to 4, the joint area between the base tire and the precure tread was large due to the presence of the concave and convex portions.

1 tire 2 precure tread 3 adhesive rubber layer 4 convex part 5 concave part 11 tread part 12 sidewall part 13 bead part 21 groove

Claims (10)

  In a retread tire in which a belt-shaped precure tread is wound through a rubber layer for adhesion to a base tire whose tread portion is polished, the tire is at least one place in the tire width direction of the ground tread portion of the base tire. While forming the convex part or recessed part extended in the circumferential direction, the convex part or recessed part which meshes with the convex part or recessed part of the said base tire was formed in the back part located in the base tire side of the said precure tread. Rehabilitation tire characterized by.   The retread tire according to claim 1, wherein a dimension of the convex portion or the concave portion in a tire radial direction is set to 2 mm to 6 mm.   The retreaded tire according to claim 1 or 2, wherein a dimension of the convex portion or the concave portion in the tire width direction is larger than a dimension in the tire radial direction.   The retreaded tire according to any one of claims 1 to 3, wherein the convex portion or the concave portion is disposed within a range of 90% closer to the center with respect to the width of the back portion of the precure tread.   The convex portion or the concave portion is arranged outside the range of 70% near the center and within the range of 90% near the center with respect to the width of the back portion of the precure tread, and a convex portion is arranged on the side of the base tire. The retreaded tire according to any one of claims 1 to 3, wherein a concave portion is disposed on the cure tread side.   While a tread portion of a used tire is polished to form a base tire, a convex portion or a concave portion extending in the tire circumferential direction is formed at least at one place in the tire width direction of the ground tread portion of the base tire. A convex portion or a concave portion that meshes with the convex portion or the concave portion of the base tire is formed on the back surface portion of the belt-shaped precure tread that is located on the base tire side, and a rubber layer for adhesion to the base tire is interposed therebetween. A method for manufacturing a retread tire, wherein when the precure tread is wound, the convex portion or the concave portion of the base tire and the convex portion or the concave portion of the precure tread are engaged with each other.   The method for manufacturing a retread tire according to claim 6, wherein a dimension of the convex portion or the concave portion in the tire radial direction is 2 mm to 6 mm.   The method for manufacturing a retread tire according to claim 6 or 7, wherein a dimension of the convex part or the concave part in the tire width direction is larger than a dimension in the tire radial direction.   The method for manufacturing a retread tire according to any one of claims 6 to 8, wherein the convex portion or the concave portion is disposed within a range of 90% closer to the center with respect to the width of the back portion of the precure tread.   The convex portion or the concave portion is arranged outside the range of 70% near the center and within the range of 90% near the center with respect to the width of the back portion of the precure tread, and a convex portion is arranged on the side of the base tire. The method for producing a retread tire according to any one of claims 6 to 8, wherein a recess is disposed on the cure tread side.

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