JP6074931B2 - Precured retreaded tire, precure tread and method for producing precure retreaded tire - Google Patents

Description

  The present invention relates to a precure retread tire, a precure retread, and a method for manufacturing a precure retread tire, and more particularly to a precure retread tire, a precure retread, and a precure retread tire that can make the weight distribution in the tire circumferential direction uniform.

  Precured retreaded tires are tires that are reused by replacing the tread rubber of a tire whose remaining groove has reached the end of its life, and are used as tires for trucks and buses. This pre-cured retread tire is made by cutting off the tread rubber of a used tire by buffing to form a base tire and adhering a vulcanized pre-cured tread having a tread pattern when new to the base tire. Yes.

  Here, since the base tire is obtained from the used tire as described above, the base tire is not eccentric. Moreover, the rubber gauge outside the belt layer may become non-uniform in the tire circumferential direction by performing non-uniform buffing in the buffing step of the base tire. For this reason, the pedestal tire usually has a non-uniform weight balance in the circumferential direction.

  On the other hand, in the conventional precure retreaded tire, there exists a request | requirement which should improve the weight distribution (dynamic balance or static balance) of a tire circumferential direction. As conventional precure retread tires relating to such problems, techniques described in Patent Documents 1 and 2 are known.

JP 2009-6583 A JP 2007-62248 A

  An object of the present invention is to provide a precure retreaded tire, a precure retread, and a method for manufacturing a precure retreaded tire that can make the weight distribution in the tire circumferential direction uniform.

In order to achieve the above object, a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the base tire, and the precure tread is a tire. A pre-cured retread tire having a plurality of circumferential main grooves extending in the circumferential direction and a plurality of land portions defined by these circumferential main grooves , wherein the circumferential main groove is an average of the entire circumference A section T having a unit groove volume smaller than the value, the section T having the emphasis of the precure tread, and a light point of the assembly composed of the base tire and the cushion rubber, and the precure tread of the precure tread The emphasis is on the same position in the tire circumferential direction.

In addition, a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the base tire, and the precure tread extends in the tire circumferential direction. A precured retread tire having a plurality of circumferential main grooves and a plurality of land portions defined by the circumferential main grooves , wherein the circumferential main grooves are larger than the average value of the entire circumference. A section T ′ having a groove volume, a section T ′ having the light spot of the precure tread, and an emphasis of the assembly made of the base tire and the cushion rubber, and a light spot of the precure tread. Are in the same position in the tire circumferential direction.

In addition, a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the base tire, and the precure tread extends in the tire circumferential direction. A precured retread tire having a plurality of circumferential main grooves and a plurality of land portions defined by the circumferential main grooves, wherein the circumferential main grooves are smaller than an average value of the entire circumference. A section T having a groove volume is provided , the section T is provided with the emphasis of the precure tread, and the light point of the pedestal tire and the emphasis of the precure tread are in the same position in the tire circumferential direction. Features.

  In addition, a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the base tire, and the precure tread extends in the tire circumferential direction. A precured retread tire having a plurality of circumferential main grooves and a plurality of land portions defined by the circumferential main grooves, wherein the circumferential main grooves are larger than the average value of the entire circumference. A section T ′ having a groove volume is provided, the section T ′ is provided with the light spot of the precure tread, and the emphasis of the base tire and the light spot of the precure tread are at the same position in the tire circumferential direction. It is characterized by being.

In addition, a method of manufacturing a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the pedestal tire, and includes a plurality of tires extending in the tire circumferential direction. A method of manufacturing a precure retread tire comprising a circumferential main groove and a plurality of land portions divided into these circumferential main grooves, and a section T having a unit groove volume smaller than the average value of the entire circumference. A cushion rubber affixing step for adhering the cushion rubber to the pedestal tire using the precure tread having the circumferential main groove having an emphasis of the precure tread in the section T, and the pedestal tire and the tyre A measuring step for measuring a light point of an assembly made of cushion rubber, and whether the base tire and the cushion rubber A precured tread affixing step of adhering the precure tread to the tire through the cushion rubber while disposing the light spot of the assembly and the emphasis of the precure tread at the same position in the tire circumferential direction; And a vulcanization step for vulcanizing an assembly including the precure tread, the base tire, and the cushion rubber.

In addition, a method of manufacturing a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the pedestal tire, and includes a plurality of tires extending in the tire circumferential direction. A method of manufacturing a precure retread tire comprising a circumferential main groove and a plurality of land portions defined by these circumferential main grooves, and a section T ′ having a unit groove volume larger than the average value of the entire circumference A cushion rubber affixing step of attaching the cushion rubber to the pedestal tire using the precure tread having the circumferential main groove having a light point of the precure tread in the section T ′ A measuring step for measuring an emphasis of an assembly including a tire and the cushion rubber; and the base tire and the cushion rubber A precured tread affixing step of adhering the precure tread to the base tire via the cushion rubber while disposing the weight of the assembly and the light point of the precure tread at the same position in the tire circumferential direction; And a vulcanizing step for vulcanizing an assembly composed of the precure tread, the base tire and the cushion rubber.

  In addition, a method of manufacturing a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the pedestal tire, and includes a plurality of tires extending in the tire circumferential direction. A method of manufacturing a precure retread tire comprising a circumferential main groove and a plurality of land portions divided into these circumferential main grooves, and a section T having a unit groove volume smaller than the average value of the entire circumference. A step of measuring the light spot of the base tire using the precure tread having the circumferential main groove having the emphasis of the precure tread in the section T, and the light spot of the base tire and the Place the pre-cured tread on the base tire via the cushion rubber while placing the pre-cured tread at the same position in the tire circumferential direction. A precured tread application step to apply, the precured tread, characterized by comprising a vulcanization step of vulcanizing the assembly consisting of the base tire and the cushion rubber.

  In addition, a method of manufacturing a precure retread tire according to the present invention includes a precure tread, a base tire, and a cushion rubber that bonds the precure tread and the pedestal tire, and includes a plurality of tires extending in the tire circumferential direction. A method of manufacturing a precure retread tire comprising a circumferential main groove and a plurality of land portions defined by these circumferential main grooves, and a section T ′ having a unit groove volume larger than the average value of the entire circumference And the step of measuring the emphasis of the pedestal tire using the precure tread having the circumferential main groove having the light point of the precure tread in the section T ′, and the emphasis of the pedestal tire, The pedestal tire is disposed through the cushion rubber while disposing the light point of the precure tread at the same position in the tire circumferential direction. A precured tread application step pasting, the precured tread, characterized by comprising a vulcanization step of vulcanizing the assembly consisting of the base tire and the cushion rubber.

  According to the manufacturing method of the precure retreaded tire, the precure retread and the precure retreaded tire according to the present invention, there is an advantage that the weight distribution in the tire circumferential direction can be made uniform.

FIG. 1 is a sectional view in the tire meridian direction showing a precure retreaded tire according to an embodiment of the present invention. FIG. 2 is a plan view showing a tread portion of the retread tire described in FIG. 1. FIG. 3 is an explanatory view showing the precure retread tire described in FIG. 1. FIG. 4 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. FIG. 5 is an explanatory view showing a modified example of the precure retread tire described in FIG. 1. FIG. 6 is an explanatory view showing a modified example of the precure retread tire described in FIG. 1. FIG. 7 is an explanatory view showing a modified example of the precure retread tire described in FIG. 1. FIG. 8 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. FIG. 9 is an explanatory view showing a modified example of the precure retread tire described in FIG. 7. FIG. 10 is an explanatory view showing a modified example of the precure retread tire described in FIG. 3. FIG. 11 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. FIG. 12 is an explanatory view showing a modified example of the precure retread tire described in FIG. 10. FIG. 13 is an explanatory view showing a modified example of the precure retread tire described in FIG. 7. FIG. 14 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. FIG. 15 is an explanatory view showing a modified example of the precure retread tire described in FIG. 13. FIG. 16 is a chart showing the results of the performance test of the precure retreaded tire according to the embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

[Precure Rehabilitation Tire]
FIG. 1 is a sectional view in the tire meridian direction showing a precure retreaded tire according to an embodiment of the present invention. In addition, the code | symbol CL has shown the tire equator surface.

  The precure retreaded tire 1 is a tire that is reused by replacing the tread rubber of a tire whose remaining groove has reached the end of its life. For example, it is used for heavy duty tires such as trucks and buses.

  The precure retread tire 1 includes a precure tread 2, a base tire 3, and a cushion rubber 4 that adheres the precure tread 2 and the base tire 3. The precure tread 2 is a tread rubber that has been vulcanized at the material stage, and constitutes a tread portion of the precure retreaded tire 1. The precure tread 2 has a plate-like structure or an annular structure (a structure not having a splice part), and has a tread pattern when the precure retread tire 1 is new on its outer peripheral surface. The base tire 3 is a member obtained by cutting off the tread rubber of a tire whose remaining groove has reached the end of its life and buffing the surface thereof. The cushion rubber 4 is a sheet-like unvulcanized rubber at the material stage, and is used for bonding the precure tread 2 and the base tire 3.

  The precure retread tire 1 is a belt formed by laminating a pair of bead cores 11, 11, a pair of bead fillers 12, 12, a carcass layer 13, and a plurality of belt plies 141 to 144 as general components. A layer 14, a tread rubber 15 constituting a tread portion, side wall rubbers 16 and 16 constituting left and right sidewall portions, and rim cushion rubbers 17 and 17 constituting left and right bead portions are provided. Among these components, the tread rubber 15 is mainly composed of the precure tread 2, and the other components are included in the base tire 3.

  FIG. 2 is a plan view showing a tread portion of the retread tire described in FIG. 1. This figure shows a general tread pattern composed of ribs and blocks.

  As shown in FIG. 2, the precure retread tire 1 includes a plurality of circumferential main grooves 21 and 22 extending in the tire circumferential direction, and a plurality of land portions 31 that are partitioned by the circumferential main grooves 21 and 22. ~ 33 are provided on the tread surface. In addition, each land part 31-33 may be a rib, and may be a block row partitioned into lug grooves.

  For example, in the configuration of FIG. 2, the precure retread tire 1 includes four circumferential main grooves 21 and 22 and five rows of land portions 31 and 32. The circumferential main grooves 21 and 22 and the land portions 31 to 33 are arranged symmetrically with respect to the tire equatorial plane CL to form a symmetrical tread pattern. Further, the center land portion 31 on the tire equator CL is a rib continuous in the tire circumferential direction.

  Further, the center land portion 31 has a plurality of notches 311 and a plurality of sipes 312, and these notches 311 and sipes 312 are arranged at predetermined intervals in the tire circumferential direction along the left and right circumferential main grooves 21, 21. Is arranged in. Further, the left and right second land portions 32, 32 each have a plurality of narrow grooves 321, and these narrow grooves 321 are arranged at predetermined intervals in the tire circumferential direction so that the second land portions 32 are disposed in the tire width direction. It penetrates. Thereby, each of the second land portions 32 and 32 is a block row divided in the tire circumferential direction by these narrow grooves 321. Each of the second land portions 32, 32 has a plurality of notches 322 and a plurality of sipes 323, and these notches 322 and sipes 323 are arranged around the tire circumference along the left and right circumferential main grooves 21, 22. They are arranged at predetermined intervals in the direction.

  The left and right shoulder land portions 33, 33 are ribs that are continuous in the tire circumferential direction. Each of the shoulder land portions 33, 33 has a plurality of non-penetrating lug grooves 331, and these lug grooves 331 are arranged at predetermined intervals in the tire circumferential direction along the edge portion on the outer side in the tire width direction. Yes. Each shoulder land portion 33, 33 has a plurality of sipes 332, and these sipes 332 are arranged at predetermined intervals between adjacent lug grooves 331, 331. Each shoulder land portion 33, 33 has a plurality of notches 333 and a plurality of sipes 334, and these notches 333 and sipe 334 are spaced at predetermined intervals in the tire circumferential direction along the outermost circumferential main groove 22. Is arranged in.

  In addition, the circumferential direction main groove means the circumferential direction groove | channel which has a groove width of 3.0 [mm] or more. The groove width of the circumferential main groove is measured excluding notches and chamfers formed in the groove openings.

[Uniform distribution of weight in the tire circumferential direction]
General precure retreaded tires are manufactured by cutting off the tread rubber of a used tire by buffing to form a base tire, and then bonding a vulcanized precure tread with a tread pattern when new to the base tire Is done.

  Here, since the base tire is obtained from the used tire as described above, the base tire is not eccentric. Moreover, the rubber gauge outside the belt layer may become non-uniform in the tire circumferential direction by performing non-uniform buffing in the buffing step of the base tire. For this reason, the pedestal tire usually has a non-uniform weight balance in the circumferential direction.

  Furthermore, in the configuration in which the precure tread and the base tire are bonded via the cushion rubber, the cushion rubber can affect the weight distribution in the tire circumferential direction. For example, when the tire weight is partially increased or decreased at the splice portion of the cushion rubber attached to the base tire, the weight distribution in the tire circumferential direction becomes non-uniform.

  Accordingly, the precure retread tire 1 employs the following configuration in order to improve the weight distribution (dynamic balance or static balance) in the tire circumferential direction.

  FIG. 3 is an explanatory view showing the precure retread tire described in FIG. 1. The figure shows the positional relationship in the tire circumferential direction between the weight distribution of the assembly X composed of the base tire 3 and the cushion rubber 4 and the weight distribution of the precure tread 2. The figure shows a case where the precure tread 2 has an annular structure that continues in the circumferential direction (ring tread) and a tread pattern that has a pitch variation structure.

  In this precure retreaded tire 1, as shown in FIG. 3, the light point Pk_a of the assembly X (not shown) of the base tire 3 and the cushion rubber 4 and the priority Pj_b of the precure tread 2 are in the tire circumferential direction. Of the same position.

  The light spot is a position where the weight per unit section is lightest among the circumferential positions of the measurement target. Further, the emphasis refers to a position where the weight per unit section is the heaviest among the circumferential positions of the measurement target. In addition, the light spot and the emphasis are selectively used as the light spot and the emphasis when the measurement target is stationary and the light spot and the emphasis when the measurement target is rotated. In general, when adjusting the static balance of a tire, light points and points at rest are used, and when adjusting the dynamic balance of a tire, light points and points at rotation are used. In addition, the measuring method of a light point and an emphasis is mentioned later.

  Note that the light point Pk_a (see FIG. 3) of the assembly X composed of the base tire 3 and the cushion rubber 4 is generally different from the light point Pk_a '(see FIG. 10 described later) of the single base tire 3. For example, in the configuration in which the cushion rubber 4 is made of a sheet-like unvulcanized rubber, when the cushion rubber 4 is attached to the outer peripheral surface of the base tire 3, the weight of the cushion rubber 4 is increased at the joining position at the circumferential end of the cushion rubber 4. Non-uniformity can occur. Specifically, when the circumferential end portions of the cushion rubber 4 are arranged so as to wrap each other, an increase in weight occurs at that position, or the circumferential end portions of the cushion rubber 4 are separated from each other. Positioning can cause weight loss at that location.

  In the precure retread tire 1, as described above, the light point Pk_a of the assembly X composed of the base tire 3 and the cushion rubber 4 and the priority Pj_b of the precure tread 2 are arranged at the same position in the tire circumferential direction ( (See FIG. 3). In such a configuration, the weight distribution in the tire circumferential direction of the precure retreaded tire 1 is effectively uniform as compared to a configuration (not shown) in which the light points of the single base tire and the emphasis of the precure tread are arranged at the same position. It becomes.

[Precured retreaded tire manufacturing method]
FIG. 4 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. Hereinafter, the manufacturing process of the precure retread tire 1 will be described along the flowchart of FIG. 4.

  In step ST11, the tread rubber of the tire whose remaining groove has reached the end of its life is cut out, buffed, and the base tire 3 is acquired. This buffing process is performed in a state where an internal pressure is applied to the tire.

  In step ST12, the base tire 3 is mounted and held in a holding device (not shown). As such a holding device, an existing holding device can be adopted.

  In step ST13, the cushion rubber 4 is pasted over the entire circumference of the outer peripheral surface of the base tire 3 with the base tire 3 held by the holding device (cushion rubber sticking step). The base tire 3 to which the cushion rubber 4 is attached is referred to as an assembly X (not shown).

  In step ST14, the assembly X is removed from the holding device, and the light point Pk_a of the assembly X is measured (measurement step). At this time, one of the light spot when the assembly X is stationary and the light spot when the assembly X rotates is selected and measured.

  Specifically, (1) a non-contact overcurrent displacement sensor is used to measure a light point when the assembly X is stationary, and the belt layer 14 of the assembly X to the outer peripheral surface of the cushion rubber 4 is used. A rubber gauge is measured. And this rubber gauge is measured over the perimeter of the assembly X, and the thinnest circumferential direction position is acquired as a light point. On the other hand, (2) in the measurement of the light point during rotation of the assembly X, the assembly X is mounted on a JATMA applicable rim corresponding to the base tire 3, and a normal internal pressure specified by JATMA is applied to the assembly X. With the assembly X rotated in an unloaded state, the dynamic balance of the assembly X is measured. In the measurement of the dynamic balance, the centrifugal force and moment generated during the rotation of the assembly X are measured, and the maximum point of this measured value is acquired as an emphasis, and the tire circumferential position that is the position opposite to this emphasis is light. Get as. Note that the light spot when the assembly X is stationary and the light spot when the assembly X rotates are in different positions. In general, the adjustment of the static balance of the tire is easier than the adjustment of the dynamic balance. Further, the emphasis of the assembly X can also be measured by the same measuring method as the light spot.

  In step ST15, the precure tread 2 is affixed to the base tire 3 via the cushion rubber 4 (precure tread affixing step). At this time, the light point Pk_a of the assembly X and the priority Pj_b of the precure tread 2 are arranged at the same position in the tire circumferential direction (see FIG. 3). The base tire 3 to which the precure tread 2 is attached is referred to as an assembly Y (not shown).

  At this time, when the precure tread 2 has a plate-like structure, the precure tread 2 is wrapped around the base tire 3 and the circumferential end of the precure tread 2 is temporarily set by a fixing member (not shown). Stopped and fixed. On the other hand, in the configuration in which the precure tread 2 has an annular structure, the precure tread 2 is expanded and contracted by a dedicated expansion / contraction diameter device (not shown) and is fitted to the outer periphery of the base tire 3. In addition, if the light point Pk_a of the assembly X and the priority Pj_b of the precure tread 2 are within a range of ± 5 [deg] as the tire center angle, it can be said that they are arranged at the same position in the tire circumferential direction. .

  The priority Pj_b (and light point Pk_b) of the precure tread 2 may be acquired based on known information, or may be acquired by measuring each time (not shown). When based on known information, for example, the following information may be employed.

  That is, the precure tread 2 may have a non-uniform weight distribution in the circumferential direction due to the characteristics of the tread pattern. In such a case, the position of the priority Pj_b of the precure tread 2 is specified based on the tread pattern. Specifically, the amount of excess rubber generated during molding of the precure tread 2 (volume of rubber material extruded by a mold for molding the tread pattern) facilitates weight distribution in the circumferential direction of the precure tread 2. Can grasp.

  As a characteristic of such a tread pattern, for example, a case where the precure tread 2 has a pitch variation structure is exemplified. In the pitch variation structure, the lug grooves 331 of the left and right shoulder land portions 33 are arranged in the circumferential direction of the precure tread 2 with a plurality of types of arrangement intervals and groove widths. For this reason, since the rubber amount of the adjacent lug grooves 331 and 331 changes as it goes in the circumferential direction, the weight distribution in the circumferential direction of the precure tread 2 may be biased. Note that the pitch variation structure has an effect of reducing pattern noise by dispersing the frequency of noise generated during traveling.

  In the configuration in which the precure tread 2 has a plate-like structure, the weight distribution may be uneven at the installation position of the circumferential end of the precure tread 2. For example, when the precure tread 2 is affixed to the outer peripheral surface of the base tire 3, unevenness in weight may occur in the splice portion of the precure tread 2. Specifically, the circumferential ends of the precure tread 2 are arranged so as to wrap each other, resulting in an increase in weight at that position, or the circumferential ends of the precure tread 2 being separated from each other. Thus, weight reduction can occur at that position. For this reason, it is preferable that the circumferential end portions of the precure tread 2 are arranged so as to contact (join) without overlapping each other. Thereby, the weight change of the circumferential direction in a splice part is reduced.

  On the other hand, in the configuration in which the precure tread 2 has an annular structure that continues in the tire circumferential direction (in the case of a ring tread), unevenness in the weight distribution due to the splice portion does not occur.

  For example, in the configuration of FIG. 3, the precure tread 2 has an annular structure that is continuous in the circumferential direction (ring tread). Further, the precure tread 2 includes a tread pattern having a pitch variation structure. For this reason, as shown in FIG. 3, the priority Pj_b and the light point Pk_b of the precure tread 2 are generated due to the tread pattern. Specifically, a point Pj_b is generated in a section where the arrangement interval of the lug grooves 331 of the shoulder land portion 33 is wide, and a light point Pk_b is generated in a section where the arrangement interval of the lug grooves 331 is narrow.

  In step ST16, a vulcanization process is performed (vulcanization step). In this vulcanization step, an assembly Y composed of the precure tread 2, the base tire 3 and the cushion rubber 4 is accommodated in a vulcanization can (not shown), and the air in the vulcanization can is vacuumed, Heating and pressurization are performed, and the cushion rubber 4 is vulcanized. Thereafter, the precure retread tire 1 (see FIG. 1) is taken out from the vulcanization can.

[Adjustment of important distribution of precure tread by unit groove volume of circumferential main groove]
5 and 6 are explanatory views showing a modification of the precure retread tire described in FIG. In these drawings, FIG. 5 shows the tire circumference of the weight distribution of the assembly X composed of the base tire 3 and the cushion rubber 4, the weight distribution of the precure tread 2, and the unit groove volume of the circumferential main grooves 21 and 22. The positional relationship of directions is shown. FIG. 6 is a cross-sectional view of the circumferential main groove 21 (22) in the tire meridian direction.

  As shown in FIG. 5, in the precure retread tire 1, the circumferential main grooves 21 and 22 have a section T having a unit groove volume smaller than the average value of the entire circumference (the entire circumference of the circumferential main grooves 21 and 22). It is preferable that the precure tread 2 has a point Pj_b in this section T.

  The unit groove volume of the circumferential main grooves 21 and 22 refers to the groove volume per unit length in the tire circumferential direction, and is calculated as the sum of the unit groove volumes of all the circumferential main grooves 21 and 22. The smaller the unit groove volume, the greater the weight of the precure tread 2 in that unit length. Accordingly, the weight distribution of the precure tread 2 in the tire circumferential direction can be adjusted by adjusting the unit groove volume of the circumferential main grooves 21 and 22.

  For example, in the configuration of FIG. 6, the groove width W, the groove depth D, the groove wall angle θ, the height H of the bottom upper portion 5 formed on the groove bottom, etc. It is possible to adjust the unit groove volume of the circumferential main grooves 21 and 22. Specifically, by setting the groove width W, groove depth D or groove wall angle θ of the circumferential main grooves 21 and 22 in the predetermined section T to be smaller than the average value of the entire circumference, the unit groove in the section T is set. The volume becomes smaller. In addition, by providing the bottom upper portion 5 in the circumferential main grooves 21 and 22 in the predetermined section T, or by making the height H of the bottom top 5 lower than the average value of the entire circumference, the unit groove volume in the section T is reduced. Get smaller.

  In the configuration of FIG. 5, the unit groove volume of the circumferential main grooves 21 and 22 is set smaller than the unit groove volume of the circumferential main grooves 21 and 22 in the section T including the priority Pj_b of the precure tread 2. Yes. Therefore, in this section T, the weight is larger than the average value of the entire circumference, and the emphasis Pj_b is emphasized. Therefore, even when the weight deviation of the light spot Pk_a of the assembly X is large, the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be appropriately uniformized.

  In the above configuration, the section T of the circumferential main grooves 21 and 22 has a length of 30 [mm] or more and 500 [mm] or less in the tire circumferential direction around the point of importance Pj_b of the precure tread 2. The unit groove volume of the circumferential main grooves 21 and 22 in this section T is preferably larger than the unit groove volume in the entire circumference (see FIG. 5). As described above, the section T in which the emphasis Pj_b is emphasized has a predetermined width in the tire circumferential direction, so that the light point Pk_a of the assembly X of the base tire 3 and the cushion rubber 4 and the emphasis Pj_b of the precure tread 2 Positioning (precure tread pasting step ST15) becomes easy.

  Moreover, in said structure, it is preferable that the unit groove volume of the circumferential direction main grooves 21 and 22 in the area T changes continuously in a tire circumferential direction (refer FIG. 5). If the function having the unit groove volume of the circumferential main grooves 21 and 22 and the tire circumferential position as variables as shown in FIG. 5 is a continuous function, it can be said that the unit groove volume is continuous in the tire circumferential direction. Specifically, the groove width W, the groove depth D, the groove wall angle θ, the height H of the bottom upper portion 5 formed at the groove bottom, and the like of the circumferential main grooves 21 and 22 of the precure tread 2 in FIG. It is preferable that it changes smoothly as it goes in the tire circumferential direction. Thereby, the weight change of the precure tread 2 in the vicinity of the priority Pj_b becomes moderate, and the precure tread 2 can be attached to the base tire 3 with high accuracy.

[Uniform weight distribution based on assembly priority]
FIG. 7 is an explanatory view showing a modified example of the precure retread tire described in FIG. 1. FIG. 8 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. These drawings show a configuration in which the weight distribution in the tire circumferential direction of the precure retreaded tire 1 is made uniform with reference to the priority Pj_a of the assembly X composed of the base tire 3 and the cushion rubber 4.

  In the configuration of FIG. 1, as shown in FIG. 3, the light point Pk_a of the assembly X composed of the base tire 3 and the cushion rubber 4 and the point Pj_b of the precure tread 2 are in the same position in the tire circumferential direction. Further, in the tire manufacturing process, as shown in FIG. 4, the light spot Pk_a of the assembly X is measured (step ST14), and the light spot Pk_a of the assembly X matches the priority Pj_b of the precure tread 2. In addition, the precure tread 2 is attached to the assembly X (step ST15). Therefore, the positional relationship in the circumferential direction between the assembly X and the precure tread 2 is defined based on the light point Pk_a of the assembly X.

  However, the present invention is not limited to this, and as shown in FIG. 7, the point Pj_a of the assembly X composed of the base tire 3 and the cushion rubber 4 and the light point Pk_b of the precure tread 2 are in the same position in the tire circumferential direction. May be adopted. Even with this configuration, the weight distribution in the tire circumferential direction of the precure retread tire 1 can be made uniform.

  Further, in the manufacturing process of the precure retread tire 1 shown in FIG. 7, as shown in FIG. 8, the priority Pj_a of the assembly X is measured (step ST24), and the priority Pj_a of the assembly X and the lightness of the precure tread 2 are measured. The precure tread 2 is affixed to the assembly X so that the point Pk_b matches (step ST25). Therefore, the positional relationship in the circumferential direction between the assembly X and the precure tread 2 is defined based on the priority Pj_a of the assembly X. In the configuration of FIG. 8, steps ST21 to ST23 and ST26 are the same as steps ST11 to ST13 and ST16 of the configuration of FIG.

  Note that, in defining the positional relationship in the circumferential direction between the assembly X and the precure tread 2, the configuration in FIG. 3 with the light point Pk_a of the assembly X as a reference and the figure with the emphasis Pj_a of the assembly X as a reference The configuration of 7 can be arbitrarily selected. At this time, it is preferable to select one that can more efficiently equalize the weight distribution in the tire circumferential direction of the precure retreaded tire 1.

  FIG. 9 is an explanatory view showing a modified example of the precure retread tire described in FIG. 7. The figure shows the relationship between the weight distribution of the assembly X composed of the base tire 3 and the cushion rubber 4, the weight distribution of the precure tread 2, and the unit groove volume of the circumferential main grooves 21, 22 at the tire circumferential position. Is shown.

  As shown in FIG. 9, in the precured retread tire 1, the circumferential main grooves 21 and 22 have a section T ′ having a unit groove volume larger than the average value of the entire circumference at a predetermined circumferential position. The cure tread 2 preferably has a light point Pk_b in this section T ′. Thereby, the light spot Pk_b in the section T ′ is emphasized, and the weight distribution in the tire circumferential direction of the precure retread tire 1 is effectively made uniform.

  Further, the unit groove volume of the circumferential main grooves 21 and 22 is the groove width W, the groove depth D, the groove wall angle θ of the circumferential main grooves 21 and 22 in FIG. It can be easily adjusted by changing the height H, dimples (not shown) and the like with respect to the average value. Specifically, by setting the groove width W, the groove depth D, or the groove wall angle θ of the circumferential main grooves 21 and 22 in the predetermined section T ′ to be larger than the average value of the entire circumference, the section T ′ The unit groove volume increases. Further, the height H of the bottom upper portion 5 of the circumferential main grooves 21 and 22 in the predetermined section T ′ is made lower than the average value of the entire circumference, or dimples are provided at the groove bottoms of the circumferential main grooves 21 and 22. As a result, the unit groove volume in the section T ′ increases.

[Uniform weight distribution based on the base tire]
FIG. 10 is an explanatory view showing a modified example of the precure retread tire described in FIG. 3. FIG. 11 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. FIG. 12 is an explanatory view showing a modified example of the precure retread tire described in FIG. 10.

  In the configuration of FIG. 3, as shown in FIG. 4, the cushion rubber 4 is attached to the base tire 3 to form the assembly X (step ST13), and the light spot Pk_a is measured for the assembly X (step ST14). The light point Pk_a of the assembly X and the priority Pj_b of the precure tread 2 are arranged at the same position in the tire circumferential direction (see the comparison between FIGS. 3A and 3B), and the precure tread 2 is Affixed to the base tire 3 (step ST15). Thereby, the weight distribution in the tire circumferential direction of the precure retread tire 1 is made uniform.

  On the other hand, in the configuration of FIG. 10, the light point Pk_a ′ of the single base tire 3 and the priority Pj_b of the precure tread 2 are arranged at the same position in the tire circumferential direction. Specifically, as shown in FIG. 11, the light spot Pk_a ′ of the stand tire 3 is measured (step ST32), and the light spot Pk_a ′ of the stand tire 3 and the priority Pj_b of the precure tread 2 are used as the tire. It arrange | positions at the same position of the circumferential direction (refer the comparison of FIG. 10 (a), (b)), and the precure tread 2 is affixed on the base tire 3 via the cushion rubber 4 (step ST35). Even with this configuration, the weight distribution in the tire circumferential direction of the precure retread tire 1 can be made uniform. In the configuration of FIG. 11, steps ST31, ST33, ST34 and ST36 are the same as steps ST11 to ST13 and ST16 in the configuration of FIG.

  As a modification of the configuration of FIG. 10, as shown in FIG. 12, the circumferential main grooves 21 and 22 have a section T having a unit groove volume smaller than the average value of the entire circumference at a predetermined circumferential position. However, it is preferable that the precure tread 2 has the emphasis Pj_b in this section T. At this time, the groove width W, the groove depth D, the groove wall angle θ, the height H of the bottom upper portion 5 formed on the groove bottom, and the like (see FIG. 6) with respect to the average value are obtained. By changing it, the unit groove volume of the circumferential main grooves 21 and 22 can be adjusted. Thereby, the weight distribution in the tire circumferential direction of the precure retread tire 1 is effectively made uniform.

  FIG. 13 is an explanatory view showing a modified example of the precure retread tire described in FIG. 7. FIG. 14 is a flowchart showing a method of manufacturing the precure retread tire described in FIG. FIG. 15 is an explanatory view showing a modified example of the precure retread tire described in FIG. 13.

  In the configuration of FIG. 10, the weight distribution in the tire circumferential direction of the precure retread tire 1 is made uniform with reference to the light point Pk_a ′ of the base tire 3. In the configuration of FIG. 7, the weight distribution in the tire circumferential direction of the precure retreaded tire 1 is made uniform by matching the tire circumferential direction positions of the emphasis Pj_a of the assembly X and the light point Pk_b of the precure retreaded tire 1. Yes.

  However, the present invention is not limited to this, and as shown in FIG. 13, the weight distribution in the tire circumferential direction of the precure retread tire 1 may be made uniform with reference to the priority Pj_a ′ of the base tire 3. That is, the weight distribution in the tire circumferential direction of the precure retreaded tire 1 may be made uniform by matching the tire circumferential direction positions of the emphasis Pj_a ′ of the base tire 3 and the light point Pk_b of the precure retreaded tire 1. Specifically, as shown in FIG. 14, the point Pj_a ′ of the stand tire 3 is measured (step ST42), and the point Pj_a ′ of the stand tire 3 and the light point Pk_b of the precure tread 2 are measured in the tire circumferential direction. The pre-cured tread 2 is attached to the base tire 3 (step ST45). Even with this configuration, the weight distribution in the tire circumferential direction of the precure retread tire 1 can be made uniform. In the configuration of FIG. 14, steps ST41, ST43, ST44 and ST46 are the same as steps ST31, ST33, ST34 and ST36 in the configuration of FIG.

  Further, in the above configuration, as shown in FIG. 15, the circumferential main grooves 21 and 22 include a section T ′ having a unit groove volume larger than the average value of the entire circumference, and the pre-cured tread is provided in the section T ′. It is preferable that two light points Pk_b are provided, and the point Pj_a ′ of the base tire 3 and the light point Pk_b of the precure tread 2 are in the same position in the tire circumferential direction. In such a configuration, since the section T having the light point Pk_b has a large unit groove volume, the weight in the section T is reduced. Thereby, even when the weight deviation in the priority Pj_a of the base tire is large, the weight distribution in the tire circumferential direction of the precure retread tire 1 can be appropriately uniformized.

[effect]
As described above, the precure retread tire 1 includes the precure tread 2, the base tire 3, and the cushion rubber 4 that bonds the precure tread 2 and the base tire 3 (see FIG. 1). Further, the light point Pk_a of the assembly X composed of the base tire 3 and the cushion rubber 4 and the point Pj_b of the precure tread 2 are in the same position in the tire circumferential direction (see FIG. 3). In this configuration, since the precure tread 2 is positioned based on the light point Pk_a of the assembly X including the cushion rubber 4, the light point of the stand tire and the emphasis of the precure tread are arranged at the same position. Compared with (refer FIG. 10), there exists an advantage which can make uniform the weight distribution of the tire circumferential direction of the precure retreaded tire 1 effectively.

  Further, in the precure retread tire 1, the precure tread 2 is composed of a plurality of circumferential main grooves 21, 22 extending in the tire circumferential direction and a plurality of land divided by the circumferential main grooves 21, 22. Part 31-33 (refer FIG. 2). In addition, the circumferential main grooves 21 and 22 include a section T having a unit groove volume smaller than the average value of the entire circumference, and include a point Pj_b of the precure tread 2 (see FIG. 5). In such a configuration, since the section T having the priority Pj_b has a small unit groove volume, the weight in the section T increases. Thereby, even when the weight deviation in the light point Pk_a of the assembly X is large, there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be appropriately uniformized.

Further, in this precure retread tire 1, the section T of the circumferential main grooves 21 and 22 has a length of 30 [mm] or more and 500 [mm] or less in the tire circumferential direction around the point of importance Pj_b of the precure tread 2. (See FIG. 5). Further, the unit groove volume of the circumferential main grooves 21 and 22 in the section T is smaller than the unit groove volume of the circumferential main grooves 21 and 22 in the entire circumference. Thereby, there exists an advantage by which the circumferential direction length of the area T which has a small unit groove volume is optimized. That is, when the section T is 30 [mm] or more, the positioning of the emphasis Pj_b of the precure tread 2 and the light point Pk_a of the assembly X can be facilitated. In addition, when the section T is 500 [mm] or less, the effect of uniformizing the weight distribution in the tire circumferential direction by reducing the unit groove volume in the section T having the priority Pj_b can be appropriately obtained.

  Moreover, in this precure retreaded tire 1, the unit groove volume of the circumferential main grooves 21 and 22 in the section T changes continuously in the tire circumferential direction (see FIG. 5). Thereby, since the change of the groove volume in the vicinity of the point Pj_b becomes gentle, there is an advantage that the positioning of the point Pj_b of the precure tread 2 and the light point Pk_a of the assembly X can be facilitated.

  Further, in this precure retread tire 1, the priority Pj_a of the assembly composed of the base tire 3 and the cushion rubber 4 and the light point Pk_b of the precure tread 2 are in the same position in the tire circumferential direction (see FIG. 7). In such a configuration, the precure tread 2 is positioned based on the point Pj_a of the assembly X including the cushion rubber 4, and therefore, the point where the point of the single tire and the light point of the precure tread are arranged at the same position ( Compared to the illustration (not shown), there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be effectively made uniform.

  Further, in the precure retreaded tire 1, the circumferential main grooves 21 and 22 are provided with a section T having a unit groove volume smaller than the average value of the entire circumference, and with an emphasis Pj_b of the precure tread 2 (see FIG. 10). ). Further, the light point Pk_a of the base tire 3 and the priority Pj_b of the precure tread 2 are at the same position in the tire circumferential direction. In such a configuration, since the section T having the priority Pj_b has a small unit groove volume, the weight in the section T increases. Thereby, even when the weight deviation in the light point Pk_a of the assembly X is large, there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be appropriately uniformized.

  Further, in the precure retread tire 1, the circumferential main grooves 21 and 22 include a section T ′ having a unit groove volume larger than the average value of the entire circumference, and the light spot Pk_b of the precure tread 2 in the section T ′. (Not shown, see FIG. 9). Further, the base tire priority Pj_a and the light spot Pk_b of the precure tread 2 are at the same position in the tire circumferential direction. In such a configuration, since the section T having the light point Pk_b has a large unit groove volume, the weight in the section T ′ is reduced. Accordingly, there is an advantage that the weight distribution in the tire circumferential direction of the precure retread tire 1 can be made uniform even when the weight deviation at the point Pj_a of the base tire is large.

  Further, in this precure retread tire 1, the precure tread 2 has an annular structure that is continuous in the circumferential direction (not shown), and the light point Pk_a of the base tire and the priority Pj_b of the precure tread 2 are the tire. It is in the same position in the circumferential direction (see FIG. 3). With such a configuration, there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be made uniform by matching the tire circumferential position of the light point Pk_a of the base tire 3 with the priority Pj_b of the precure tread 2.

  In addition, the precure retread tire 1 has an annular structure that is continuous in the circumferential direction (not shown), and the point Pj_a of the base tire 3 and the light spot Pk_b of the precure tread 2 are in the same position in the tire circumferential direction. (See FIG. 7). With such a configuration, there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be made uniform by matching the tire circumferential position of the priority Pj_a of the base tire 3 and the light point Pk_b of the precure tread 2.

  The precure tread 2 is bonded to the base tire 3 via a cushion rubber 4 to constitute a precure retread tire 1 (see FIG. 1), and a plurality of circumferential main grooves 21 extending in the tire circumferential direction. , 22 and a plurality of land portions 31 to 33 defined by the circumferential main grooves 21 and 22 (see FIG. 2). In addition, the circumferential main grooves 21 and 22 include the section T having a unit groove volume smaller than the average value of the entire circumference, and the section T includes the priority Pj_b of the precure tread 2 (see FIG. 5). In such a configuration, there is an advantage that the weight in the section T can be increased because the section T having the priority Pj_b has a small unit groove volume.

  In addition, the precure tread 2 includes the section T ′ in which the circumferential main grooves 21 and 22 have a unit groove volume larger than the average value of the entire circumference, and the light spot Pk_b of the precure tread 2 in the section T ′. (See FIG. 9). In such a configuration, the section T ′ having the light point Pk_b has a large unit groove volume, so that there is an advantage that the weight in the section T ′ can be reduced.

  In addition, in the manufacturing method of the precure retread tire 1, the cushion rubber attaching step (ST 13) for attaching the cushion rubber 4 to the base tire 3 and the light point Pk_a of the assembly X composed of the base tire 3 and the cushion rubber 4 are measured. While the measurement step (ST14), the light point Pk_a of the assembly X composed of the base tire 3 and the cushion rubber 4 and the point Pj_b of the precure tread 2 are arranged at the same position in the tire circumferential direction, the precure tread 2 is cushioned rubber. 4 and a vulcanization step ST16 for vulcanizing the assembly Y composed of the precure tread 2, the base tire 3 and the cushion rubber 4 (see FIG. 4). ). In such a configuration, since the precure tread 2 is positioned based on the light point Pk_a of the assembly X including the cushion rubber 4 (see FIG. 3), the precure tread 2 is positioned based on the light point of a single stand tire. There is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be effectively equalized as compared with the configuration (see FIG. 10).

  In addition, the manufacturing method of the precure retread tire 1 includes a cushion rubber sticking step ST21 for sticking the cushion rubber 4 to the base tire 3, and a measurement step ST24 for measuring the priority Pj_a of the assembly X composed of the base tire 3 and the cushion rubber 4. And the precured tread 2 via the cushion rubber 4 while the important point Pj_a of the assembly X composed of the base tire 3 and the cushion rubber 4 and the light point Pk_b of the precure tread 2 are arranged at the same position in the tire circumferential direction. A precure tread affixing step ST25 to be affixed to the tire 3 and a vulcanization step ST26 for vulcanizing the assembly Y composed of the precure tread 2, the base tire 3 and the cushion rubber 4 are provided (see FIG. 8). In such a configuration, the precure tread 2 is positioned based on the emphasis Pj_a of the assembly X including the cushion rubber 4 (see FIG. 7), and therefore the precure tread 2 is positioned based on the emphasis of a single stand tire. Compared to (not shown), there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be effectively made uniform.

  Moreover, the manufacturing method of this precure retread tire 1 has the circumferential direction main groove | channels 21 and 22 which have the area | region T which has a unit groove volume smaller than the average value of a whole circumference, and has the priority Pj_a of the precure tread 2 in the area T. Precure tread 2 provided (see FIG. 12) is used. Moreover, the manufacturing method of the precure retread tire 1 is the same as the measurement step ST32 for measuring the light spot Pk_a ′ of the base tire 3, the light spot Pk_a ′ of the base tire 3 and the priority Pj_a of the precure tread 2 in the tire circumferential direction. Precure tread application step ST35 in which the precure tread 2 is attached to the base tire 3 via the cushion rubber 4 while being placed in position, and the assembly Y composed of the precure tread 2, the base tire 3 and the cushion rubber 4 is vulcanized. And vulcanizing step ST36 (see FIG. 11). In such a configuration, since the section T having the priority Pj_b has a small unit groove volume, the weight in the section T increases (see FIG. 12). The light spot Pk_a ′ of the base tire 3 and the priority Pj_a of the precure tread 2 are arranged at the same position in the tire circumferential direction. Accordingly, even when the weight deviation at the light point Pk_a ′ of the base tire 3 is large, there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be appropriately uniformized.

  Further, the manufacturing method of the precure retread tire 1 has a circumferential main groove 21 having a section T ′ having a unit groove volume larger than the average value of the entire circumference and having a light spot Pk_b of the precure tread 2 in the section T ′. , 22 is used. (See FIG. 15). In addition, the manufacturing method of the precure retread tire 1 includes a measurement step ST42 for measuring the point Pj_a ′ of the base tire 3, and the point Pj_a ′ of the base tire 3 and the light point Pk_b of the precure tread 2 at the same position in the tire circumferential direction. Precure tread application step ST45 in which the precure tread 2 is attached to the base tire 3 via the cushion rubber 4 while being disposed in the rim, and the assembly Y composed of the precure tread 2, the base tire 3 and the cushion rubber 4 is vulcanized. And vulcanization step ST46 (see FIG. 14). Then, the point Pj_a ′ of the base tire 3 and the light point Pk_b of the precure tread 2 are arranged at the same position in the tire circumferential direction. Thereby, even when the weight deviation at the priority Pj_a ′ of the base tire 3 is large, there is an advantage that the weight distribution in the tire circumferential direction of the precure retreaded tire 1 can be appropriately uniformized.

  FIG. 16 is a chart showing the results of the performance test of the precure retreaded tire according to the embodiment of the present invention.

  In this performance test, a pre-cured retread tire with a tire size 205 / 85R16 having a tread pattern of one pitch variation was manufactured, and the pre-cured retreaded tire was evaluated for weight distribution in the tire circumferential direction (see FIG. 13). This evaluation is performed by index evaluation (100) based on the conventional example, and the larger the value, the better.

  Precured retread tires 1 of Examples 1 to 10 have the configurations shown in FIGS. 1 and 2. The first and seventh embodiments have the configuration shown in FIG. 3, the second and eighth embodiments have the configuration shown in FIG. 5, the third and ninth embodiments have the configuration shown in FIG. .., 6 and 10 have the configuration of FIG. Thereby, the tire circumferential direction position of the priority Pj_b of the precure tread 2 is optimized. 5 and FIG. 12, the four circumferential main grooves 21 and 22 have a bottom upper portion 5 at the groove bottom (see FIG. 6). It is lower than the surroundings at the position having the priority Pj_b of the cure tread 2. As a result, the weight of the precure tread 2 in the arrangement section T of the priority Pj_b is increased. Moreover, in the structure of Examples 7-10, the precure tread which has a cyclic structure is provided.

  In the precure retread tire of the conventional example, the light point of the base tire and the splice part of the precure tread are arranged at the same position in the tire circumferential direction (not shown) in the configuration of FIGS. However, the spliced part of the precure tread and its emphasis are not consistent.

  As shown in the test results, it is understood that the weight distribution in the tire circumferential direction is appropriately uniformized in the precure retreaded tires 1 of Examples 1 to 10.

  1 Precure Rehabilitation Tire, 2 Precure Tread, 3 Tires, 4 Cushion Rubber, 5 Bottom Top, 11 Bead Core, 12 Bead Filler, 13 Carcass Layer, 14 Belt Layer, 141, 142 Belt Ply, 15 Tread Rubber, 16 Side Wall Rubber, 17 Rim cushion rubber, 21, 22 Circumferential main groove, 31-33 Land part, 331 Lug groove, 311, 322, 333 Notch part, 312, 323, 332, 334 Sipe, 321 Narrow groove

Claims (13)

A precure tread, a base tire, and a cushion rubber for bonding the precure tread and the base tire, and the precure tread has a plurality of circumferential main grooves extending in the tire circumferential direction, and A precure retreaded tire having a plurality of land portions divided into circumferential main grooves ,
The circumferential main groove includes a section T having a unit groove volume smaller than the average value of the entire circumference, the section T includes the emphasis of the precure tread, and
A precure retreaded tire characterized in that a light point of an assembly composed of the base tire and the cushion rubber and an emphasis of the precure tread are in the same position in the tire circumferential direction. The section T of the circumferential main groove has a length of 30 [mm] or more and 500 [mm] or less in the tire circumferential direction centering on the precured tread emphasis, and the unit of the circumferential main groove in the section T The precure retreaded tire according to claim 1 , wherein a groove volume is smaller than a unit groove volume of the circumferential main groove in the entire circumference. The pre-cured retread tire according to claim 1 , wherein a unit groove volume of the circumferential main groove in the section T continuously changes in the tire circumferential direction. A precure tread, a base tire, and a cushion rubber for bonding the precure tread and the base tire, and the precure tread has a plurality of circumferential main grooves extending in the tire circumferential direction, and A precure retreaded tire having a plurality of land portions divided into circumferential main grooves ,
The circumferential main groove includes a section T ′ having a unit groove volume larger than the average value of the entire circumference, the section T ′ includes the light spot of the precure tread, and
The pre-cured retread tire characterized in that the emphasis of the assembly composed of the base tire and the cushion rubber and the light spot of the precure tread are in the same position in the tire circumferential direction. A precure tread, a base tire, and a cushion rubber for bonding the precure tread and the base tire, and the precure tread has a plurality of circumferential main grooves extending in the tire circumferential direction, and A precure retreaded tire having a plurality of land portions divided into circumferential main grooves,
The circumferential main groove includes a section T having a unit groove volume smaller than the average value of the entire circumference , the section T includes the emphasis of the precure tread, and
A pre-cured retread tire characterized in that the light point of the base tire and the emphasis of the precure tread are in the same position in the tire circumferential direction. A precure tread, a base tire, and a cushion rubber for bonding the precure tread and the base tire, and the precure tread has a plurality of circumferential main grooves extending in the tire circumferential direction, and A precure retreaded tire having a plurality of land portions divided into circumferential main grooves,
The circumferential main groove includes a section T ′ having a unit groove volume larger than the average value of the entire circumference, the section T ′ includes the light spot of the precure tread, and
A pre-cured retread tire characterized in that an emphasis of the base tire and a light spot of the precure tread are at the same position in the tire circumferential direction. Precured retread tire according to any one of claims 1 to 6 wherein the flop-les tread is, to have a cyclic structure circumferentially continuous. A pre-cured tread, a pedestal tire, a cushion rubber for bonding the precure tread and the pedestal tire, and a plurality of circumferential main grooves extending in the tire circumferential direction, and divided into these circumferential main grooves A method for producing a precure retread tire comprising a plurality of land portions ,
Using the precure tread having the section T having a unit groove volume smaller than the average value of the entire circumference and including the circumferential main groove having the emphasis of the precure tread in the section T; and
A cushion rubber attaching step of attaching the cushion rubber to the base tire;
A measuring step for measuring a light point of the assembly comprising the base tire and the cushion rubber;
The precure tread is affixed to the pedestal tire via the cushion rubber while disposing the light point of the assembly comprising the pedestal tire and the cushion rubber and the emphasis of the precure tread at the same position in the tire circumferential direction. A precure tread affixing step,
A vulcanizing step for vulcanizing an assembly composed of the precure tread, the base tire and the cushion rubber, and a method for producing a precure retread tire. A pre-cured tread, a pedestal tire, a cushion rubber for bonding the precure tread and the pedestal tire, and a plurality of circumferential main grooves extending in the tire circumferential direction, and divided into these circumferential main grooves A method for producing a precure retread tire comprising a plurality of land portions ,
Using the precure tread comprising the circumferential main groove having a section T ′ having a unit groove volume larger than the average value of the entire circumference and having a light spot of the precure tread in the section T ′;
A cushion rubber attaching step of attaching the cushion rubber to the base tire;
A measuring step for measuring the emphasis of the assembly comprising the base tire and the cushion rubber;
The precure tread is affixed to the pedestal tire via the cushion rubber while the emphasis of the assembly composed of the pedestal tire and the cushion rubber and the light spot of the precure tread are arranged at the same position in the tire circumferential direction. A precure tread affixing step,
A vulcanizing step for vulcanizing an assembly composed of the precure tread, the base tire and the cushion rubber, and a method for producing a precure retread tire. A pre-cured tread, a pedestal tire, a cushion rubber for bonding the precure tread and the pedestal tire, and a plurality of circumferential main grooves extending in the tire circumferential direction, and divided into these circumferential main grooves A method for producing a precure retread tire comprising a plurality of land portions,
Using the precure tread having the section T having a unit groove volume smaller than the average value of the entire circumference and including the circumferential main groove having the emphasis of the precure tread in the section T; and
A measuring step for measuring a light spot of the base tire;
A precure tread affixing step of affixing the precure tread to the pedestal tire via the cushion rubber while disposing the light point of the pedestal tire and the emphasis of the precure tread at the same position in the tire circumferential direction;
A vulcanizing step for vulcanizing an assembly composed of the precure tread, the base tire and the cushion rubber, and a method for producing a precure retread tire. A pre-cured tread, a pedestal tire, a cushion rubber for bonding the precure tread and the pedestal tire, and a plurality of circumferential main grooves extending in the tire circumferential direction, and divided into these circumferential main grooves A method for producing a precure retread tire comprising a plurality of land portions,
Using the precure tread comprising the circumferential main groove having a section T ′ having a unit groove volume larger than the average value of the entire circumference and having a light spot of the precure tread in the section T ′;
A measuring step for measuring the emphasis of the base tire;
A precured tread pasting step of pasting the precure tread to the base tire via the cushion rubber while placing the weight of the base tire and the light spot of the precure tread at the same position in the tire circumferential direction;
A vulcanizing step for vulcanizing an assembly composed of the precure tread, the base tire and the cushion rubber, and a method for producing a precure retread tire.   The pre-cured retread tire according to claim 8 or 10, wherein the emphasis of the precure tread is acquired based on a pitch variation structure or other characteristics of a tread pattern or an excess rubber amount generated when the precure tread is molded. Manufacturing method.   The precure retreading according to claim 9 or 11, wherein a light spot of the precure tread is obtained based on a pitch variation structure or other characteristics of a tread pattern, or an amount of surplus rubber generated when the precure tread is molded. Tire manufacturing method.

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