JP2013256232A - Retreaded tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve heat resistance without lowering chipping resistance.SOLUTION: In a retreaded tire, a rib-shaped land part 13 extended in a tire circumferential direction is formed at a central center area ce among three parts into which a development width TDW is divided in a tire width direction and a tread part 1 where block-shaped land parts 13a divided into plural parts in the tire circumferential direction are formed at shoulder areas sh on both outer sides is arranged with a cushion rubber 3 interposed between itself and a base tire 2. When the maximum thickness of the cushion rubber 3 in the central center area ce is made to be Gce-max, the minimum thickness of the cushion rubber 3 in the central center area ce is made to be Gce-min, the minimum thickness of the cushion rubber 3 in the shoulder areas sh is made to be Gsh-min, and a thickness in a crown center including the cushion rubber 3 and the tread part 1 is made to be Tcc, a range expressed by 1.5×Gsh-min≤Gce-min≤Gce-min≤Gce-max≤0.5×Tcc is satisfied.

Description

  The present invention relates to a retread tire.

  It is generally known that a tire is reused as a retread tire by attaching a new tread portion to a base tire obtained by cutting out and buffing the tread rubber of a pneumatic tire whose remaining groove has reached the end of its life.

  Conventionally, for example, the retreaded tire described in Patent Document 1 is designed to reduce the unevenness of the rough surface formed in the center portion in a precure tread having a tread pattern with a lag tone in order to improve low heat generation during running. It is shown that the precure tread is affixed to the outer peripheral surface of the base tire via a low heat-generating cushion rubber, deeper than the region other than the region. This retreaded tire usually generates more heat at the center portion in the lug-based tread pattern, but the heat generation at the center portion is reduced by arranging a relatively large amount of low heat-generating cushion rubber at the center portion.

JP-A-10-129216

  It is well known that heat generation is reduced at a place where a relatively large amount of cushion rubber is arranged like the retread tire described in Patent Document 1 described above. However, in recent years, in order to improve the performance of retreaded tires, a device for further improving heat resistance is desired.

  This invention is made | formed in view of the above, Comprising: It aims at providing the retreaded tire which can improve heat resistance more.

  In order to solve the above-described problems and achieve the object, the retread tire of the present invention has a rib-like land portion extending in the tire circumferential direction in a central center region obtained by dividing the development width into three equal parts in the tire width direction. In the retread tire in which a tread portion formed with a block-shaped land portion that is formed and divided into a plurality of tire circumferential directions in both outer shoulder regions is disposed via a cushion rubber with the base tire, The maximum thickness of the cushion rubber in the center region is Gce-max, the minimum thickness of the cushion rubber in the center region is Gce-min, and the minimum thickness of the cushion rubber in the shoulder region is Gsh-min, When the thickness at the crown center including the cushion rubber and the tread portion is Tcc, 1.5 × Gsh-min Characterized by satisfying the range of Gce-min ≦ Gce-max ≦ 0.5 × Tcc.

  In the center region, the rubber amount of the tread portion is increased because the rib-shaped land portion is formed. For this reason, the heat generation in the center region tends to be large, which can cause a failure. According to the retread tire of the present invention, the thickness of the cushion rubber in the center region in the tire radial direction is made thicker than the shoulder region, and the amount of rubber in the tread portion in the center region is reduced, thereby reducing the heat generation amount. The heat resistance can be further improved.

  In addition, after the middle period of wear due to the use of retreaded tires, there is a concern that the wear resistance may deteriorate or chipping may occur if the cushion rubber is exposed on the tread surface. According to the retread tire of the present invention, the maximum thickness Gce-max of the cushion rubber in the center region is set to 1/2 or less of the thickness Tcc at the crown center including the cushion rubber and the tread portion. It is possible to prevent the cushion rubber from being exposed to the tread surface after the middle period of wear due to use.

  Further, the retread tire of the present invention has a main groove extending in the tire circumferential direction in the aspect of forming the rib-shaped land portion in the tread portion, and also forms the block-shaped land portion of the tire. The tread portion has a plurality of lug grooves that extend in the width direction and communicate with the main groove and are arranged in the tire circumferential direction, and the maximum depth of the lug groove is Gd, and the shoulder region When the maximum thickness of the tread portion is L, the range of 0.20 ≦ Gd / L ≦ 0.80 is satisfied, and the total number of the lug grooves in any one of the shoulder regions is t, and the shoulder region In the case where the tire circumferential length is K, the range of K / 150 ≦ t ≦ K / 50 is satisfied.

  According to this retreaded tire, by being in the range of 0.20 ≦ Gd / L ≦ 0.80, it maintains good straightness, drainage, and low rolling properties as a rib pattern in which circumferential grooves are arranged. However, it can also have braking / driving force as a lug pattern. Moreover, by being in the range of K / 150 <= t <= K / 50, the number of lug grooves can be set appropriately and a braking / driving force can be ensured. If the relationship between the maximum groove depth Dd of the lug groove and the maximum thickness L of the tread portion in the shoulder region is smaller than 0.20, the lug groove tends to disappear easily in the early stage of wear, and it becomes difficult to maintain the braking / driving force. . On the other hand, if the relationship between the maximum groove depth Dd of the lug groove and the maximum thickness L of the tread portion in the shoulder region is larger than 0.80, it is difficult to sufficiently secure the thickness of the cushion rubber. Further, when the total number t of lug grooves is smaller than K / 150, the lug grooves arranged on the tire circumference are reduced, and it becomes difficult to sufficiently secure the braking / driving force. On the other hand, when the total number t of the lug grooves is larger than K / 50, the interval between the adjacent lug grooves arranged is narrow and the rigidity of the tread tends to be weakened.

  In the retread tire of the present invention, the cushion rubber is 0.5 [mm] ≦ Gsh-min ≦ 2.0 [mm], 2.5 [mm] ≦ Gce-min ≦ Gce-max ≦ 10.0. It is characterized by satisfying the range of

  In the shoulder region, the cushion rubber is preferably in the range of 0.5 [mm] ≦ Gsh-min ≦ 2.0 [mm] in order to ensure the thickness necessary for adhesion between the tread portion and the base tire. Furthermore, in the center region, the effect of improving the heat resistance and the effect of preventing the cushion rubber from being exposed to the tread surface after the middle stage of wear due to the use of the retread tire are remarkably obtained, so that 2.5 [mm] ≦ Gce− It is preferable to be in the range of min ≦ Gce−max ≦ 10.0.

  The retread tire of the present invention is characterized in that a loss tangent tan δ at 60 ° C. of the cushion rubber satisfies a range of 0.03 ≦ tan δ ≦ 0.10.

  In order to reduce heat generation in the cushion rubber, the range of 0.03 ≦ tan δ ≦ 0.10 is preferable.

  The retread tire of the present invention satisfies Pce <Psh when the minimum thickness of the tread portion in the center region is Pce and the maximum thickness of the tread portion in the shoulder region is Psh. And

  The thickness of the tread portion including the cushion rubber in the tire radial direction is desirably uniform from the center region to the shoulder region in the meridional section when being attached to the base tire. For this reason, in the center region, the thickness of the cushion rubber is increased compared to the shoulder region, so that the thickness of the tread portion is decreased compared to the shoulder region, whereas in the shoulder region, the cushion is compared with the center region. Since the thickness of the rubber is reduced, it is preferable to increase the thickness of the tread portion compared to the center region ce.

  Further, in the retread tire of the present invention, the total width of the cushion rubber in the tire width direction is formed larger than the total width of the tread portion in the tire width direction, and the tire width direction of the cushion rubber than the tread portion of the cushion rubber. When the maximum thickness of the portion disposed on the outside is Gout-max, a range of 0.5 [mm] ≦ Gout-max ≦ Gsh-min is satisfied.

  In order to bond the entire tread part to the base tire, the total width of the cushion rubber in the tire width direction should be made larger than the total width of the tread part in the tire width direction in consideration of dimensional errors when forming the tread part. Is preferred. However, if the portion disposed on the outer side in the tire width direction than the tread portion of the cushion rubber is too thick, when the retreaded tire is formed, a large convex portion is formed by the cushion rubber on the outer surface in the tire width direction of the base tire. Therefore, it is preferable to set the range of 0.5 [mm] ≦ Gout−max ≦ Gsh-min so that the minimum necessary thickness is obtained.

  The retreaded tire according to the present invention can further improve heat resistance.

FIG. 1 is a development view of a tread portion of a retread tire according to an embodiment of the present invention. FIG. 2 is a development view of another tread portion of the retread tire according to the embodiment of the present invention. FIG. 3 is a partial meridional cross-sectional schematic view of a retread tire according to an embodiment of the present invention. FIG. 4 is a chart showing the results of performance tests of retread tires according to examples of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. The constituent elements of this embodiment include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  In the following description, the tire radial direction refers to a direction orthogonal to the rotation axis (not shown) of the retreaded tire, the tire radial direction inner side refers to the side toward the rotation axis in the tire radial direction, and the tire radial direction outer side. The side away from the rotation axis in the tire radial direction. Further, the tire circumferential direction refers to a direction around the rotation axis as a central axis. Further, the tire width direction means a direction parallel to the rotation axis, the inner side in the tire width direction means the side toward the tire equator plane (tire equator line) CL in the tire width direction, and the outer side in the tire width direction means the tire width direction. Is the side away from the tire equatorial plane CL. The tire equatorial plane CL is a plane that is orthogonal to the rotational axis of the retread tire and passes through the center of the tire width of the retread tire. The tire width is the width in the tire width direction between the portions located outside in the tire width direction, that is, the distance between the portions farthest from the tire equatorial plane CL in the tire width direction. The tire equator line is a line along the tire circumferential direction of the retread tire on the tire equator plane CL. In the present embodiment, the same sign “CL” as that of the tire equator plane is attached to the tire equator line.

  As shown in FIGS. 1 to 3, the retread tire according to this embodiment has a tread portion 1. The tread portion 1 is made of a rubber material, exposed at the outermost side in the tire radial direction of the retread tire, and the surface thereof becomes the contour of the retread tire. A tread surface 11 is formed on the outer peripheral surface of the tread portion 1, that is, the tread surface that comes into contact with the road surface during traveling. The tread surface 11 is provided with a plurality of (two in this embodiment) main grooves 12 extending in the tire circumferential direction. The main groove 12 shown in FIG. 1 extends in the tire circumferential direction and is formed in a zigzag shape, and the main groove 12 shown in FIG. 2 extends in the tire circumferential direction and has a linear shape parallel to the tire equatorial plane CL. Is formed. The tread surface 11 is formed with a plurality (three in this embodiment) of rib-like land portions 13 extending in the tire circumferential direction by a plurality of main grooves 12. Further, in the rib-shaped land portion 13, each outermost land portion 13 in the tire width direction is divided into a plurality in the tire circumferential direction by lug grooves 14 that communicate with the main groove 12 and are arranged in the tire circumferential direction. A block-shaped land portion 13a is formed. Further, the lug groove 14 is formed to open to the outer side in the tire width direction on the outermost side in the tire width direction of the tread portion 1.

  In the tread portion 1, the center of the developed width of the tread surface 11 divided into three equal parts in the tire width direction is a center region ce, and both outer sides are shoulder regions sh. The center area ce has a rib-like land portion 13 formed in the area. Further, the shoulder region sh is formed with a block-shaped land portion 13a in the region. The main groove 12 may be formed in either the center region ce or the shoulder region sh.

  The tread development width TDW means both ends of the tread surface 11 in the tire width direction (grounding end: tire width of the grounding surface) when the tire is mounted on a specified rim and applied with a normal internal pressure and is not loaded. The linear distance between the edges of the direction.

  Here, the regular rim is “standard rim” defined by JATMA, “Design Rim” defined by TRA, or “Measuring Rim” defined by ETRTO. The normal internal pressure is “maximum air pressure” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “INFLATION PRESSURES” defined by ETRTO. However, in JATMA, in the case of tires for passenger cars, the specified internal pressure is air pressure 180 [kPa], and the specified load is 88 [%] of the maximum load capacity.

  The tread portion 1 is disposed between the base tire 2 and the cushion rubber 3 to constitute a retread tire. The base tire 2 is obtained by cutting out and buffing the tread rubber of a pneumatic tire whose remaining groove has reached the end of its life. The tire has a main configuration such as a bead portion, a carcass layer, and a belt layer. The cushion rubber 3 is used for bonding the tread portion 1 and the base tire 2.

  In the present embodiment, as shown in FIG. 3, the retread tire has a maximum thickness of the cushion rubber 3 in the center region ce as Gce-max, and a minimum thickness of the cushion rubber 3 in the center region ce as Gce-min, Let Gsh-min be the minimum thickness of the cushion rubber 3 in the shoulder region sh. The thickness at the crown center (position on the tire equatorial plane CL) including the cushion rubber 3 and the tread portion 1 is defined as Tcc. And in the retreaded tire, these satisfy | fill the range of 1.5 * Gsh-min <= Gce-min <= Gce-max <= 0.5 * Tcc.

  Note that the maximum thickness of the cushion rubber 3 in the shoulder region sh is the same as Gce-min when it is at the boundary with the center region ce. In FIG. 3, both sides in the tire width direction are formed with the tire equatorial plane CL as a boundary, but the minimum thickness Gce-min of the cushion rubber 3 in the center region ce and the cushion rubber in the shoulder region sh 3 may have different minimum thicknesses Gsh-min.

  In the center region ce, since the rib-like land portion 13 is formed, the rubber amount of the tread portion 1 is increased. For this reason, the heat generation in the center region ce tends to be large, which can cause a failure. According to the retread tire of the present embodiment, the thickness in the tire radial direction of the cushion rubber 3 in the center region ce is made thicker than the shoulder region sh, and the rubber amount of the tread portion 1 in the center region ce is reduced. Since the amount of generated heat is reduced, the heat resistance can be improved.

  Moreover, after the middle period of wear due to the use of retreaded tires, if the cushion rubber 3 is exposed to the tread surface 11, there is a concern that the wear resistance may be deteriorated or chipping may occur. According to the retreaded tire of the present embodiment, the maximum thickness Gce-max of the cushion rubber 3 in the center region ce is set to ½ or less of the thickness Tcc at the crown center including the cushion rubber 3 and the tread portion 1. Thus, it is possible to prevent the cushion rubber 3 from being exposed to the tread surface 11 after the middle period of wear due to the use of the retreaded tire. In order to remarkably obtain the effect of preventing the cushion rubber 3 from being exposed to the tread surface 11 after the middle period of wear due to the use of the retreaded tire, it is preferable to set the range of Gce-max ≦ 0.3 × Tcc.

  Moreover, while the retread tire of this embodiment has the main groove 12 extended in a tire circumferential direction in the aspect which forms the rib-shaped land part 13 in the aspect which forms the rib-shaped land part 13 as shown in FIG.1 and FIG.2, The tread portion 1 has lug grooves 14 that extend in the tire width direction and are arranged in the tire circumferential direction in a manner that forms block-shaped land portions 13a. As shown in FIG. 3, when the maximum depth of the lug groove 14 is Gd and the maximum thickness of the tread portion 1 in the shoulder region sh is L, 0.20 ≦ Gd / L ≦ 0.80 It is preferable to satisfy the range. Further, when the total number of lug grooves 14 in any one shoulder region sh is t and the tire circumferential length in the shoulder region sh is K, it is preferable that the range of K / 150 ≦ t ≦ K / 50 is satisfied. .

  According to this retreaded tire, by being in the range of 0.20 ≦ Gd / L ≦ 0.80, it maintains good straightness, drainage, and low rolling properties as a rib pattern in which circumferential grooves are arranged. However, it is also possible to have a braking / driving force as a lag pattern. Moreover, by being in the range of K / 150 <= t <= K / 50, the number of the lug grooves 14 is set appropriately, and it becomes possible to ensure braking / driving force. If the relationship between the maximum groove depth Dd of the lug groove 14 and the maximum thickness L of the tread portion 1 in the shoulder region sh is smaller than 0.20, the lug groove 14 tends to disappear in the early stage of wear, and the braking / driving force is reduced. It becomes difficult to maintain. On the other hand, if the relationship between the maximum groove depth Dd of the lug groove 14 and the maximum thickness L of the tread portion 1 in the shoulder region sh is greater than 0.80, it is difficult to sufficiently secure the thickness of the cushion rubber 3. Further, when the total number t of the lug grooves 14 is smaller than K / 150, the lug grooves 14 arranged on the tire circumference are reduced, and it is difficult to sufficiently secure the braking / driving force. On the other hand, when the total number t of the lug grooves 14 is larger than K / 50, the interval between the adjacent lug grooves 14 arranged is narrow and the rigidity of the tread tends to be weakened.

  In FIG. 1 to FIG. 3, both sides in the tire width direction are formed with the tire equatorial plane CL as a boundary, but the configuration of the main groove 12 and the configuration of the lug groove 14 may be different.

  In the retread tire according to the present embodiment, the cushion rubber 3 has 0.5 [mm] ≦ Gsh-min ≦ 2.0 [mm], 2.5 [mm] ≦ Gce-min ≦ Gce-max ≦ 10. It is preferable to satisfy the range of 0.

  In the shoulder region sh, the cushion rubber 3 is set in a range of 0.5 [mm] ≦ Gsh−min ≦ 2.0 [mm] in order to secure a thickness necessary for bonding the tread portion 1 and the base tire 2. . Furthermore, in the center region ce, the effect of improving heat resistance and the effect of preventing the cushion rubber 3 from being exposed to the tread surface 11 after the middle stage of wear due to the use of retreaded tires are significantly obtained. ≦ Gce−min ≦ Gce−max ≦ 10.0.

  In the retread tire of this embodiment, the loss tangent tan δ at 60 ° C. of the cushion rubber 3 preferably satisfies the range of 0.03 ≦ tan δ ≦ 0.10.

  In order to reduce heat generation in the cushion rubber 3, a range of 0.03 ≦ tan δ ≦ 0.10 is set. Note that the loss tangent tan δ at 60 ° C. in the cushion rubber 3 is determined by measuring a sample collected from the retread tire.

  Further, as shown in FIG. 3, the retread tire according to the present embodiment has a minimum thickness (not including the cushion rubber 3) of the tread portion 1 in the center region ce as Pce, and a maximum thickness of the tread portion 1 in the shoulder region sh. When the thickness (excluding the cushion rubber 3) is Psh, it is preferable to satisfy Pce <Psh. Pce and Psh are the thicknesses of the portions where the main groove 12 and the lug groove 14 do not exist.

  The thickness in the tire radial direction of the tread portion 1 including the cushion rubber 3 is desirably uniform from the center region ce to the shoulder region sh in the meridional section when being attached to the base tire 2. For this reason, in the center region ce, the thickness of the cushion rubber 3 is increased compared to the shoulder region sh. Therefore, the thickness of the tread portion 1 is decreased compared to the shoulder region sh. Since the thickness of the cushion rubber 3 is reduced compared to the region ce, the thickness of the tread portion 1 is increased compared to the center region ce.

  Moreover, as shown in FIG. 3, the retread tire of this embodiment is formed so that the total width of the cushion rubber 3 in the tire width direction is larger than the total width of the tread portion 1 in the tire width direction. And when the maximum thickness of the part arrange | positioned in the tire width direction outer side from the tread part 1 of the cushion rubber 3 is set to Gout-max, the range of 0.5 [mm] <= Gout-max <= Gsh-min is set. It is preferable to satisfy.

  In order to bond the entire tread portion 1 to the base tire 2, the total width in the tire width direction of the cushion rubber 3 is determined from the total width in the tire width direction of the tread portion 1 in consideration of dimensional errors when forming the tread portion 1. It is preferable to form a large film. However, if the portion disposed on the outer side in the tire width direction than the tread portion 1 of the cushion rubber 3 is too thick, when the retreaded tire is formed, the cushion rubber 3 has a large convex portion on the outer surface in the tire width direction. Therefore, the range of 0.5 [mm] ≦ Gout−max ≦ Gsh-min is set so that the minimum necessary thickness is obtained.

  In this example, performance tests regarding chipping resistance and heat resistance were performed on a plurality of types of retreaded tires having different conditions (see FIG. 4).

  The chipping resistance performance test is performed on a rear wheel of a test vehicle of 2-D4 (front 2-rear 4-drive) by reassembling a retread tire of tire size 11R22.5 on a normal rim and filling the normal internal pressure. Four pieces were mounted, and after running for 50,000 [km], the degree of chipping (chips) in the tread portion was determined by visual inspection. Then, based on this determination result, index evaluation is performed with the conventional (98) standard. This evaluation shows that the larger the index, the lower the chipping.

  In the heat resistance performance test, retreaded tires with a tire size of 11R22.5 are assembled on a regular rim, filled with regular internal pressure corresponding to multiple wheels, loaded with a regular load corresponding to double wheels, and an indoor drum test. The internal temperature of the tread portion (on the crown portion-3B edge) was measured after running for 5 hours under the condition of a running speed of 80 [km / h]. Then, based on this measurement result, index evaluation with the conventional (100) as the standard is performed. This evaluation shows that the larger the index, the lower the calorific value. Note that “on the crown portion-3B edge” is a range from the crown portion to the edge (outermost position in the tire width direction) of 3B (the outermost belt in the tire radial direction) (the outer side in the tire radial direction). Further, the internal temperature of the tread portion is measured only at the location “on the 3B edge”.

  The regular rim is as described above. The normal internal pressure is “maximum air pressure” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “INFLATION PRESSURES” defined by ETRTO. The normal load is “maximum load capacity” defined by JATMA, a maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “LOAD CAPACITY” defined by ETRTO. In addition, the normal internal pressure of a double wheel is 850 [kPa], and the normal load of a double wheel is 28.44 [kPa] (ETRTO regulation).

  In FIG. 4, the retread tires of the conventional example, the comparative example, and the examples 1 to 13 have the tread pattern shown in FIG. In the retreaded tires of the conventional example and the comparative example, Gce-max, Gce-min, Gsh-min, and Tcc do not satisfy the prescribed ranges.

  On the other hand, in FIG. 4, in the retreaded tires of Examples 1 to 13, Gce-max, Gce-min, Gsh-min, and Tcc satisfy specified ranges. In the retreaded tires of Examples 7 to 13, Gd / L and t satisfy specified ranges. In the retreaded tires of Examples 9 to 13, tan δ satisfies the specified range. Further, in the retreaded tires of Examples 3 to 13, the relationship between Pce and Psh satisfies the regulations. In the retreaded tire of Example 13, Gout-max and Gsh-min satisfy the specified ranges.

  As shown in the test results of FIG. 4, it can be seen that the retreaded tires of Examples 1 to 13 have improved heat resistance without deteriorating chipping resistance.

DESCRIPTION OF SYMBOLS 1 Tread part 11 Tread surface 12 Main groove 13 Rib-shaped land part 13a Block-shaped land part 14 Lug groove 2 tires 3 Cushion rubber CL Tire equatorial plane (tire equatorial line)
ce Center area sh Shoulder area TDW Tread development width

Claims (6)

A rib-like land portion extending in the tire circumferential direction is formed in the center region of the center obtained by dividing the development width into three equal parts in the tire width direction, and a plurality of blocks in the tire circumferential direction are divided in the outer shoulder regions. In the retread tire where the tread part where the land part is formed is arranged via the cushion rubber between the base tire,
The maximum thickness of the cushion rubber in the center region is Gce-max, the minimum thickness of the cushion rubber in the center region is Gce-min, and the minimum thickness of the cushion rubber in the shoulder region is Gsh-min. When the thickness at the crown center including the cushion rubber and the tread portion is Tcc, the range of 1.5 × Gsh-min ≦ Gce-min ≦ Gce-max ≦ 0.5 × Tcc is satisfied. Rehabilitated tire featuring.   The main tread portion has a main groove extending in the tire circumferential direction in the aspect of forming the rib-shaped land portion, and the main groove extends in the tire width direction in the aspect of forming the block-shaped land portion. The tread portion has a plurality of lug grooves arranged in the tire circumferential direction in communication with the groove, the maximum depth of the lug groove is Gd, and the maximum thickness of the tread portion in the shoulder region is L When the range of 0.20 ≦ Gd / L ≦ 0.80 is satisfied, the total number of lug grooves in any one of the shoulder regions is t, and the tire circumference in the shoulder region is K The rehabilitated tire according to claim 1, wherein a range of K / 150 ≦ t ≦ K / 50 is satisfied.   The cushion rubber satisfies a range of 0.5 [mm] ≦ Gsh-min ≦ 2.0 [mm], 2.5 [mm] ≦ Gce-min ≦ Gce-max ≦ 10.0. The retreaded tire according to claim 1 or 2.   The retreaded tire according to any one of claims 1 to 3, wherein a loss tangent tan δ at 60 ° C of the cushion rubber satisfies a range of 0.03 ≦ tan δ ≦ 0.10.   5. The structure according to claim 1, wherein Pce <Psh is satisfied, where Pce is a minimum thickness of the tread portion in the center region and Psh is a maximum thickness of the tread portion in the shoulder region. Rehabilitation tire according to any one of the above.   The total thickness of the cushion rubber in the tire width direction is greater than the total width of the tread portion in the tire width direction, and the maximum thickness of the portion of the cushion rubber that is disposed outside the tread portion in the tire width direction The rehabilitated tire according to any one of claims 1 to 5, wherein a range of 0.5 [mm]? Gout-max? Gsh-min is satisfied when the thickness is Gout-max.

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