JP7002996B2 - Tire vulcanization molding equipment - Google Patents

Description

The present invention relates to a tire vulcanization molding apparatus for vulcanizing and molding unvulcanized raw tires.

Generally, a tire vulcanization molding device uses a molding die that forms a tread groove in the tread portion of a tire and forms the tread groove to the shoulder portion, and a pair of side molds that form a pair of sidewall portions of the tire to form an outer circumference of a raw tire. It has a tire molding die that presses the surface to mold it.
Then, at the same time as heating the tire molding die from the outside, heating steam or the like is sent to the bladder inserted inside the raw tire to expand it and press the inner peripheral surface of the raw tire to heat the raw tire. It is vulcanized and molded.

If there is a large difference in the temperature of each part of the tire during vulcanization and the degree of vulcanization is significantly different, the physical characteristics of the rubber may differ, which may affect the performance of the tire.
In particular, in the tread portion of the tire, a tread groove is formed by the ridge portion on the design surface of the molded mold, so that the ridge portion bites into the tread portion of the raw tire and heat is easily transferred, so that the tread portion is The temperature is higher than other parts and the progress of vulcanization tends to be faster.

Therefore, there is an example in which the temperature of the heat source is controlled to optimize the vulcanization degree of the tread portion in particular (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-230102

The tire vulcanization method described in Patent Document 1 controls the set temperature of a heat source provided on the outside of a tire molding mold together with the vulcanization time, and lowers the set temperature from the middle of vulcanization. By vulcanization, the degree of vulcanization of the tread portion is optimized with the minimum vulcanization time.

However, in Patent Document 1, each heat source provided behind each of the molding mold and the pair of upper and lower side molds is controlled to be set to a predetermined temperature at the same time, and the temperature is adjusted according to each part of the tire. Therefore, it is not possible to reduce the temperature difference between parts.

In particular, in the tread portion of the tire, the temperature around the tread groove in which the ridge portion of the design surface of the molded mold bites is higher than that of other portions during vulcanization, and over-vulcanization is likely to occur. This cannot be resolved.

The present invention has been made in view of this point, and an object thereof is to prevent the peripheral portion of the tread groove of the tire tread portion during vulcanization from becoming hotter than other portions and becoming overvulcanized. The point is to provide a tire vulcanization molding apparatus that can be used.

In order to achieve the above object, the tire vulcanization molding apparatus according to the present invention is used.
A pair of side molds that form a pair of tire sidewalls,
A tire molding die is composed of a molding mold that forms a tread portion and a shoulder portion of a tire.
A holder member that is in contact with the outer peripheral surface on the opposite side of the inner peripheral surface, which is the design surface of the molded mold, to hold the molded mold is provided.
In a tire vulcanization molding apparatus in which a heated tire molding die is molded and the raw tire is vulcanized and molded by pressing the raw tire from the outside.
A heat insulating portion is internally provided in at least one of the molding mold and the holder member.
The heat insulating portion shall be provided at a position corresponding to the tread groove formed in the tread portion of the tire by the ridge portion on the inner peripheral surface of the molding mold in the tire radial direction in the molded state of the tire molding die. It is characterized by.

According to this configuration, the heat insulating portion provided internally in at least one of the molding mold and the holder member is formed in the tread portion of the tire by the ridge portion on the inner peripheral surface of the molding mold in the state of molding the tire molding mold. Since it is provided at a position corresponding to the formed tread groove in the tire radial direction, heat is transferred from the holder member heated from the outside to the tread portion of the raw tire via the molding mold, and the shortest time is to the tread groove. Since a heat insulating part is present in the heat transfer route along the tire radial direction to prevent heat transfer, the area around the tread groove in the tread part of the tire is heated more than other parts to cause oversulfurization. It is possible to prevent the tire from becoming tired and homogenize the physical properties of the rubber in each part of the tire to maintain high tire performance.

In the above configuration
The tread groove may be a tread circumferential groove extending in the circumferential direction of the tread portion of the tire.

According to this configuration, the heat insulating portion provided internally in at least one of the molding mold and the holder member is expanded in diameter by extending the annular tread circumferential groove in the tire radial direction in the state of molding of the tire molding die. A heat insulating part is interposed in the middle of the heat transfer route along the tire radial direction, which is provided in an annular shape at the position where the tire is formed and is transmitted to the tread circumferential groove in the molded mold and the holder member in the shortest time, and heat transfer is hindered. There is.
Therefore, heat transfer to the peripheral portion of the tread circumferential groove of the tread portion is suppressed, heating of the peripheral portion of the tread circumferential groove is suppressed, and the peripheral portion of the tread circumferential groove of the tire tread portion is overvulcanized. Can be prevented from becoming.

In the above configuration
The heat insulating portion may be provided in the molding mold and may be a circumferential groove space that opens in the outer peripheral surface of the molding mold and extends in the tire circumferential direction.

According to this configuration, since the heat insulating portion is provided in the molding mold and is a circumferential groove space that opens in the outer peripheral surface of the molding mold and extends in the tire circumferential direction, the heat insulating portion is transmitted to the tread circumferential groove in the molding mold in the shortest time. A circumferential groove space, which is a heat insulating part, is interposed in the middle of the heat transfer route to effectively suppress heat transfer to the peripheral part of the tread peripheral groove, and the heating of the peripheral part of the tread peripheral groove is suppressed. Therefore, it is possible to prevent the portion around the tread circumferential groove of the tread portion of the tire from being overvulcanized.

In the above configuration
The heat insulating portion may be provided in the holder member and may be a circumferential groove space that opens in the inner peripheral surface of the holder member and extends in the tire circumferential direction.

According to this configuration, since the heat insulating portion is provided in the holder member and is a circumferential groove space that opens in the inner peripheral surface of the holder member and extends in the tire circumferential direction, it is the shortest in the tread circumferential groove in the holder member. A circumferential groove space, which is a heat insulating part, is interposed in the middle of the heat transfer route to transfer heat, and heat transfer to the peripheral part of the tread peripheral groove is effectively suppressed, so that the peripheral part of the tread peripheral groove is heated. It is suppressed, and it is possible to prevent the portion around the tread circumferential groove of the tread portion of the tire from being overvulcanized.

In the above configuration
The heat insulating portion may be provided in the holder member and may be a circumferential groove space that opens in the outer peripheral surface of the holder member and extends in the tire circumferential direction.

According to this configuration, since the heat insulating portion is provided in the holder member and is a circumferential groove space that opens in the outer peripheral surface of the holder member and extends in the tire circumferential direction, the heat transferred to the tread groove in the holder member in the shortest time. A circumferential groove space, which is a heat insulating part, is interposed in the middle of the transmission route, and heat transfer to the peripheral part of the tread peripheral groove is effectively suppressed, and heating of the peripheral part of the tread peripheral groove is suppressed. It is possible to prevent the portion around the tread circumferential groove of the tread portion of the tire from being overvulcanized.

In the above configuration
The heat insulating portion may be a circumferential hole space provided inside the ridge portion extending in the circumferential direction of the inner peripheral surface of the molding mold forming the tread circumferential groove. ..

According to this configuration, the heat insulating portion is a circumferential hole provided inside the circumferential ridge portion extending in the circumferential direction of the inner peripheral surface which is the design surface of the molding mold forming the tread circumferential groove. Since it is a space, heat is transferred to the tread portion of the raw tire via the heated molding mold, and the heat insulating portion is connected to the heat transfer route through the circumferential ridge portion that transfers the heat to the circumferential groove of the tread in the shortest time. Heat transfer is effectively suppressed through a certain circumferential hole space, heating of the peripheral portion of the tread circumferential groove is suppressed, and the peripheral portion of the tread circumferential groove of the tire tread becomes overvulcanized. Can be prevented.

In the above configuration
In the tire molding die, the pair of side molds are arranged one above the other to form an upper side mold and a lower side mold, and the lower side mold is located on the lower side of the raw tire. The upper side mold presses the other sidewall portion on the upper side of the raw tire from above, and the molded mold presses the tread portion and shoulder portion of the raw tire from the outside to perform mold clamping. Made,
Of the tread circumferential grooves formed in parallel in the vertical direction, which is the tire width direction of the tread portion of the tire molded by the tire molding mold, in the upper tread circumferential groove and the tire radial direction. The heat insulating portion may be provided at a corresponding position.

The lower side mold supports one sidewall portion on the lower side of the raw tire from below, the upper side mold presses the other sidewall portion on the upper side of the raw tire from above, and the molded mold presses the raw tire from above. When the tire molding mold is opened, the molding mold moves outward and the upper side mold rises to open the mold by pressing the tread part and shoulder part of the tire from the outside. Flows toward the lower side of the lower side mold and the molding mold, and the lower side of the molding mold is cooled from the upper side.
Therefore, during continuous production, when the next raw tire is vulcanized, the initial temperature of the lower side of the molding mold tends to be lower than that of the upper side, so that the molding mold is heated without vertical deflection and is raw. When the tread portion of the tire is vulcanized, the vulcanization of the upper side of the tread portion, which is heated by the upper side where the initial temperature of the molding mold is high, tends to proceed more.

According to the above configuration, among the tread circumferential grooves formed in parallel in the vertical direction, which is the tire width direction, on the tread portion of the tire, heat insulation is performed at a position corresponding to the upper tread circumferential groove in the tire radial direction. Since the portion is provided, heat transfer to the peripheral portion of the upper tread circumferential groove, which is heated by the upper side where the initial temperature of the molding mold is high and vulneration is more likely to proceed, is suppressed, and the upper side of the tread portion is provided. It is possible to prevent the tread from progressing in particular as compared with other parts, homogenize the physical properties of the rubber in each part of the tire, and maintain high tire performance.

In the above configuration
The heat insulating portions adjacent to each other may be formed integrally by overlapping a part of each other.

According to this configuration, the adjacent heat insulating portions are partially overlapped with each other and formed integrally, so that heat transfer to the region portion including each peripheral portion of the plurality of adjacent tread circumferential grooves on the upper side is suppressed. As a result, heat transfer to the peripheral portion of the upper tread circumferential groove where vulcanization is more likely to proceed is suppressed, and vulcanization on the upper side of the tread portion is prevented from progressing particularly as compared with other portions. Therefore, the physical properties of the rubber in each part of the tire can be homogenized to maintain high tire performance.
Further, the heat insulating portions adjacent to each other are partially overlapped with each other and formed integrally, so that the number of the heat insulating portions can be reduced and the heat insulating portions can be easily provided.

In the above configuration
The tread groove may be a tread width direction groove extending in the tire width direction of the tread portion of the tire.

According to this configuration, the heat insulating portion provided internally in at least one of the molding mold and the holder member is provided at a position corresponding to the groove in the tread width direction and the tire radial direction in the molded state of the tire molding die. A heat insulating portion is interposed in the middle of the heat transfer route along the tire radial direction that transfers heat to the tread circumferential groove in the mold and the holder member at the shortest, and heat transfer is hindered.
Therefore, heat transfer to the peripheral portion of the tread width direction groove of the tread portion is suppressed, the temperature rise of the peripheral portion of the tread width direction groove is suppressed, and the peripheral portion of the tread width direction groove of the tire tread portion is excessively added. It is possible to prevent vulcanization and homogenize the physical properties of rubber in each part of the tire to maintain high tire performance.

In the above configuration
The heat insulating portion may be a widthwise groove space that is internally provided in the molding mold and opens in the outer peripheral surface of the molding mold and extends in the tire width direction.

According to this configuration, since the heat insulating portion is provided in the molding mold and is a width direction groove space that opens in the outer peripheral surface of the molding mold and extends in the tire width direction, the heat insulating portion is transmitted to the tread width direction groove in the molding mold in the shortest time. The width direction groove space, which is a heat insulating part, is interposed in the middle of the heat transfer route along the tire radial direction, effectively suppressing the heat transfer to the peripheral part of the tread width direction groove, and the periphery of the tread width direction groove. It is possible to suppress the temperature rise of the portion and prevent the peripheral portion of the tread width direction groove of the tread portion of the tire from being overvulcanized.

In the present invention, a heat insulating portion is internally provided on at least one of the molding mold and the holder member, and the heat insulating portion is a tread portion of the tire due to a ridge portion on the inner peripheral surface of the molding mold in a state where the tire molding mold is fastened. Since it is provided at a position corresponding to the tread groove formed in the tire radial direction, heat is transferred from the holder member heated from the outside to the tread portion of the raw tire via the molding mold, and the shortest is the tread groove. Since a heat insulating part is present in the heat transfer route along the tire radial direction to prevent heat transfer, the area around the tread groove in the tread part of the tire is heated from other parts and over-sulfurized. It is possible to maintain high performance of the tire by homogenizing the physical properties of the rubber of each part of the tire.

It is sectional drawing which shows the mold compaction state of the tire vulcanization molding apparatus of 1st Embodiment of this invention. It is sectional drawing which shows the mold opening state of the tire vulcanization molding apparatus. It is an exploded sectional view of a raw tire, a molding mold, and a holder member in the tire vulcanization molding apparatus. It is sectional drawing which shows the mold clamping state which the molding mold was pressed against the raw tire. It is a perspective view which shows the state which the holder member holds the mold. It is a perspective view of the molded mold. It is sectional drawing of the main part of the tread portion, the molding mold, and the mold-fastened state of the holder member which shows the deformation example of the circumferential groove space. It is sectional drawing of the raw tire and the mold for forming a tire, which shows another deformation example of a circumferential groove space, in a molded state. It is sectional drawing of the raw tire and the mold for forming a tire which shows the further deformation example of the circumferential groove space, in the state of being clamped. It is sectional drawing of the raw tire and the mold for forming a tire, which shows another deformation example of a circumferential groove space, in a molded state. It is sectional drawing which shows the raw tire of the tire vulcanization molding apparatus of 2nd Embodiment of this invention, and the mold compaction state of the tire molding die. It is an exploded sectional view of a raw tire, a molding mold, and a holder member in the tire vulcanization molding apparatus. It is a perspective view which shows the state which the holder member holds the mold. It is a perspective view of the holder member. It is sectional drawing of the main part of the tread portion, the molding mold, and the mold-fastened state of the holder member which shows the deformation example of the circumferential groove space. FIG. 3 is a cross-sectional view of a main part of a raw tire and a tire molding die in a molded state, showing another modification of the circumferential groove space. FIG. 3 is a cross-sectional view of a main part of a raw tire and a tire molding die in a molded state, showing still another modification of the circumferential groove space. FIG. 3 is a cross-sectional view of a main part of a raw tire and a tire molding die in a molded state, showing yet another modification of the circumferential groove space. It is sectional drawing which shows the raw tire of the tire vulcanization molding apparatus of the 3rd Embodiment of this invention, and the mold compaction state of the tire molding die. It is a perspective view which shows the state which the holder member holds the molding mold in the tire vulcanization molding apparatus. It is sectional drawing which shows the raw tire of the tire vulcanization molding apparatus of the 4th Embodiment of this invention, and the mold compaction state of the tire molding die. FIG. 21 is an enlarged cross-sectional view of a main part of FIG. It is an exploded sectional view of the tread part of a raw tire and a molding mold. It is sectional drawing which shows the raw tire of the tire vulcanization molding apparatus of the 4th Embodiment of this invention, and the mold compaction state of the tire molding die. It is an exploded sectional view of the tread part of a raw tire and a molding mold. It is a figure which shows the outer peripheral surface of the tread part of the raw tire by the arrow view of XXVI of FIG. It is a figure which shows the outer peripheral surface of the molding mold by the arrow view of XXVII of FIG.

The tire vulcanization molding apparatus 10 of the first embodiment according to the present invention will be described with reference to FIGS. 1 to 10.
FIG. 1 is a cross-sectional view showing a mold-clamped state of a tire molding die 11 in the tire vulcanization molding apparatus 10 of the first embodiment.

The tire vulcanization molding apparatus 10 presses the unvulcanized raw tire 1 of the pneumatic radial tire before vulcanization molding from the inside by the bladder 26 while compression molding from the outside with the tire molding mold 11. The raw tire 1 is vulcanized and molded by heating the inner and outer surfaces of the tire 1 with a heating device or a heat medium such as steam for a predetermined time.

As shown in FIG. 1, the unvulcanized raw tire 1 is molded by the tire forming die 11 in a prone position with the tire rotation center axis Lc oriented in the vertical vertical direction.
With reference to FIG. 3, the raw tire 1 in the prone position has a carcass layer (not shown) laid in a toroidal shape between a pair of upper and lower ring-shaped bead rings 2 and 2 as a skeleton of the carcass layer. The tread portion 3 is circumscribed on the outer peripheral surface of the belt layer (not shown) that is circumscribed outward in the tire radial direction (direction perpendicular to the tire rotation center axis Lc), and the tire is circulated from both sides of the tread portion 3 in the tire width direction. A pair of upper and lower sidewall portions 5, 5 extend inward in the radial direction via the upper and lower shoulder portions 4, 4, and the bead ring 2, said to the inner peripheral end of the pair of upper and lower sidewall portions 5, 5 inside the tire radial direction. 2 is embedded to form a pair of upper and lower bead portions 6, 6.

With reference to FIG. 1, the tire molding die 11 includes a lower side mold 12 that supports and forms the lower sidewall portion 5 of the pair of upper and lower sidewall portions 5 and 5 of the raw tire 1 from below. The upper side mold 13 is formed by pressing the upper sidewall portion 5 from the upper side, and the molding mold 14 is formed by pressing the tread portion 3 and the shoulder portions 4 and 4 from the outside in the tire radial direction.

The pair of upper and lower bead portions 6 and 6 are formed by being pressed by the bead molds 15 and 15, respectively.
The tire molding die 11 is made of an aluminum alloy.

As shown in FIG. 5, in the molding mold 14, the holder member 20 is held from the outer peripheral side for each sector.
In the molding mold 14, a design surface for forming a tread pattern by a tread groove is formed on the inner peripheral surface 14i on the surface of the tread portion 3 (see FIG. 3).

The holder member 20 holds a plurality of the molded molds 14 from behind in contact with the outer peripheral surface 14o on the side opposite to the inner peripheral surface 14i which is the design surface of the molded mold 14.
The holder member 20 is made of iron, and the inner peripheral surface 20i is in contact with the outer peripheral surface 14o of the molding mold 14, and the molding mold 14 is held so as to sandwich the upper and lower sides of the molding mold 14 from the outside.

The lower side mold 12 of the tire forming die 11 is held from below by the lower container 22, and the upper side mold 13 is held from above by the upper container 23, and the outer ring is movably suspended from the upper container 23. 25 is in contact with the outer peripheral surface 20o of the holder member 20 and holds the holder member 20 from the outside.

Inside the raw tire 1, the bladder 26 is expanded by sending heated steam or the like into the inside, and as shown in FIG. 1, the inner surface of the raw tire 1 is pressed from the inside for vulcanization molding.
Both ends of the bladder 26 are gripped by a pair of clamp members 27, 27.

The lower container 22, the upper container 23, and the outer ring 25 are provided with a heat source (not shown) such as a platen, a heat plate, and a heater, or a heat medium such as heated steam is introduced into an internal cavity to serve as a heat source. Then, the tire molding die 11 is heated from the outside.
The heated tire molding die 11 transfers heat to the raw tire 1 from the outside, while the bladder 26 expanded by the heated steam or the like transfers heat to the raw tire 1 from the inside, and the raw tire 1 is transferred from the inside and outside. It is heated and vulcanized.

The bladder 26 is removed from the molded state of the tire vulcanization molding apparatus 10 shown in FIG. 1, and the outer ring 25 suspended from the upper container 23 is held along with the molding mold 14 while holding the holder member 20 and the tire rotation center shaft. When the tire moves in the radial direction away from Lc and the upper container 23 is raised as it is, the upper container 23 is held and the upper side mold 13, the molding mold 14, and the holder member 20 are all raised, and the mold opening state shown in FIG. 2 is obtained. Will be.

In the mold-opened state, the molded mold 14 moves diagonally upward outside the tire radial direction away from the tread portion 3 of the raw tire 1, and the upper side mold 13 rises away from the upper sidewall portion 5 of the raw tire 1. ing.

Therefore, when the mold is opened after vulcanization molding, the holder member 20 separates from the lower side mold 12 and moves diagonally upward on the outer side in the tire radial direction. Therefore, as shown by an arrow in FIG. 2, the lower side mold 12 and the holder member The space between the tire and the tire 20 is opened, and the outside air flows into this gap, and at the same time, the outside air also flows into the inner (upper side) of the lower sidewall portion 5 as shown by the arrow in FIG. 2 on the inner peripheral side of the raw tire 1. ..
In this way, since the outside air flows from the inside and outside toward the lower sidewall portion 5 and the lower side of the molded mold 14 of the raw tire 1, the lower side of the molded mold 14 is cooled together with the lower sidewall portion 5 from the upper side. Will be.

On the other hand, hot air stays in the space between the upper side mold 13 and the upper sidewall portion 5 that rises away from the upper sidewall portion 5 of the raw tire 1, and together with the upper sidewall portion 5. The temperature of the upper side of the molding mold 14 is slower than that of the lower side.
Therefore, during continuous production, when the next raw tire is vulcanized, the initial temperature of the lower side of the molding mold 14 tends to be lower than that of the upper side, so that the molding mold 14 is heated without vertical deflection. When the tread portion 3 of the raw tire 1 is vulcanized, the vulcanization of the upper side of the tread portion 3 heated by the upper side where the initial temperature of the molding mold 14 is high tends to proceed more.

With reference to FIG. 3, the tread portion 3 of the raw tire 1 has a plurality of tread circumferential grooves 3v extending in the circumferential direction in the vertical direction, which is the tire width direction (four in the first embodiment). ) Formed in a ring shape.
The annular tread circumferential groove 3v is formed by a circumferential ridge portion 14p formed so as to extend in the circumferential direction on the inner peripheral surface 14i which is the design surface of the molding mold 14.

When the tire molding die 11 molds and heats the raw tire 1, the tread portion 3 of the raw tire 1 is vulcanized by the design surface of the inner peripheral surface 14i of the molding mold 14. At this time, the circumferential ridge portion 14p of the inner peripheral surface 14i of the molding mold 14 bites into the tread portion 3, and the tread circumferential groove 3v is formed.
The peripheral portion of the tread circumferential groove 3v of the tread portion 3 where the heat is transferred and the circumferential ridge portion 14p becomes high temperature is heated from other portions to proceed with vulcanization.

In the first embodiment, four tread circumferential grooves 3v extending in the circumferential direction are arranged in parallel in the vertical direction on the tread portion 3, but as described above, the initial temperature of the molding mold 14 is high. Since the upper side is higher than the lower side, of the four tread circumferential grooves 3v, the peripheral portion of the upper two tread circumferential grooves 3v is particularly prone to overvulcanization due to the progress of vulcanization.

Therefore, in the first embodiment, the molding mold 14 that transfers heat to the tread portion 3 is provided with a heat insulating portion that hinders heat transfer.
The heat insulating portion is a circumferential groove space 14S that opens in the outer peripheral surface 14o of the forming mold 14 and extends in the circumferential direction of the tire. Circumferential grooves 3v, 3v on the upper side of the tread portion 3 of 1 corresponding to the tire radial directions R (directions indicated by arrows R perpendicular to the tire rotation center axis Lc in FIG. 4), respectively. Spaces 14S and 14S are formed.

As shown in FIG. 6, the circumferential groove space 14S has a diameter expanded in the tire radial direction R from the tread circumferential groove 3v formed in the ring shape of the tread portion 3 of the raw tire 1, and the outer peripheral surface of the molding mold 14 is formed. It is configured in a ring along 14o.

With reference to FIG. 3, the circumferential groove space 14S opened on the outer peripheral surface 14o of the molding mold 14 has a rectangular cross section, and the width D in the tire width direction on the opening surface of the circumferential groove space 14S is , The width length d on the tread surface of the tread circumferential groove 3v is twice.

When the tire molding mold 11 is heated from the outside in the state shown in FIG. 1 in which the raw tire 1 is molded by the tire molding mold 11, the raw tire 1 is raw from the heated holder member 20 via the molding mold 14. While heat is transferred to the tread portion 3 of the tire 1, the circumferential groove space 14S, which is a heat insulating portion, is connected to the heat transfer route along the tire radial direction R, which transfers heat to the upper two tread circumferential grooves 3v at the shortest. Intervenes and interferes with heat transfer.

In the case of the tire molding mold 11 of the tire vulcanization molding apparatus 10 of the first embodiment, as described above, in each vulcanization molding during continuous production, the initial temperature of the molding mold 14 is higher than the lower side. Of the four tread circumferential grooves 3v, the peripheral part of the upper two tread circumferential grooves 3v is particularly prone to overvulcanization due to the progress of vulcanization, so the upper two treads are likely to be overvulcanized. By interposing the circumferential groove space 14S of the molding mold 14 in the heat transfer route that transfers to each of the circumferential grooves 3v at the shortest time to prevent heat transfer during heating, the two upper tread circumferential grooves 3v of the tread portion 3 Suppresses the progress of vulcanization from other parts of the tire, prevents partial overvulcanization, homogenizes the physical properties of rubber in each part of the tire, and enhances tire performance. Can be maintained.

Since the molding mold 14 is made of an aluminum alloy and has a large thermal conductivity and is easily equalized as a whole, the volume specific heat is transferred to the heat transfer routes that are transmitted to the upper two tread circumferential grooves 3v of the molding mold 14 in the shortest time. By internally installing the small circumferential groove space 14S as a heat insulating portion, it is possible to suppress the temperature of the peripheral portion of the upper two tread circumferential grooves 3v of the tread portion 3 from becoming higher than that of other portions as much as possible. Can be done.

In the first embodiment, the width length D in the tire width direction at the opening surface of the circumferential groove space 14S is twice the width length d at the tread surface of the tread circumferential groove 3v, but the volume. Considering the specific heat and the heat transfer rate, if the width D of the circumferential groove space 14S is 1 to 2 times the width d of the tread circumferential groove 3v, the above effect can be expected.

The circumferential groove space 14S formed on the outer peripheral surface 14o of the molding mold 14 has a rectangular cross section, but in the modification shown in FIG. 7, the circumferential groove space 14T has a trapezoidal cross section.
Even if the cross section of the circumferential groove space 14T is trapezoidal, if the width of the long base of the trapezoid is 1 to 2 times the width length d of the tread circumferential groove 3v, heat transfer is hindered and the tread portion 3 It is possible to prevent the peripheral portion of the upper two tread circumferential grooves 3v from being overvulcanized.
If the cross section of the circumferential groove space is trapezoidal, the strength of the molding mold 14 is structurally increased.

Further, an example of deformation of the circumferential groove space of the outer peripheral surface 14o of the molding mold 14 will be shown and described with reference to FIGS. 8 and 9.
In the tire molding die 11 shown in FIG. 8, the circumferential groove space 14U formed on the outer peripheral surface 14o of the molding mold 14 has the above-mentioned adjacent circumferential groove spaces 14S and 14S partially overlapped with each other and integrated. It was formed.

Heat transfer to the region including the peripheral parts of the adjacent tread circumferential grooves 3v and 3v on the upper side is suppressed, and the peripheral parts of the adjacent tread peripheral grooves 3v and 3v on the upper side are other. It is possible to suppress the progress of vulcanization from the site and prevent partial overvulcanization.
Further, since the adjacent circumferential groove spaces are partially overlapped with each other and formed integrally, the number of the circumferential groove spaces can be reduced and the molding mold 14 can be easily machined and formed.

The molding die 14 of the tire molding die 11 shown in FIG. 9 has a circumferential groove space 14V in which the cross-sectional shape of the circumferential groove space 14U shown in FIG. 8 is modified.
The circumferential groove space 14V has a larger tire radial direction width on the upper side than on the lower side in the vertical direction, which is the tire width direction.

In each vulcanization molding during continuous production, the initial temperature of the molding mold 14 is higher on the upper side than on the lower side, and vulcanization on the upper side of the tread portion 3 proceeds more. By increasing the radial width, it is possible to prevent the peripheral part of the tread circumferential groove 3v at or near the uppermost part from becoming hotter than other parts, and prevent partial overvulcanization. can do.

In the above example in which the circumferential groove space is provided on the outer peripheral surface 14o of the forming mold 14, the tire forming die 11 of the tire vulcanization forming apparatus 10 faces the tire rotation center axis Lc in the vertical vertical direction and lies down. Since the lower side mold 12, the upper side mold 13, and the molding mold 14 support the raw tire 1 by molding, the initial temperature of the lower side of the molding mold 14 is lower than that of the upper side due to the mold opening. The vulcanization of the upper side of the tread portion 3 which is heated by the upper side where the initial temperature of the molding die 14 is high tends to proceed more.

Therefore, the circumferential groove spaces 14S, 14T, 14U, 14V are formed at positions corresponding to the tread circumferential groove 3v on the upper side of the tread portion 3 of the raw tire 1 in the tire radial direction on the outer peripheral surface 14o of the molding mold 14. , The vulcanization on the upper side of the tread portion 3 was suppressed.

However, due to the structure of the tire vulcanization molding apparatus 10, if the initial temperature of the lower side of the molding mold 14 is not lower than that of the upper side due to the mold opening, the tire width direction is along the outer peripheral surface 14o of the molding mold 14. It is not necessary to provide a circumferential groove space biased to one side.

As described above, if the initial temperature of the lower side of the molding mold 14 is not lower than that of the upper side due to the mold opening, as shown in FIG. 10, the tread portion 3 of the raw tire 1 on the outer peripheral surface 14o of the molding mold 14 14W of the circumferential groove space may be formed at positions corresponding to all the tread circumferential grooves 3v and the tire radial direction.
That is, each circumferential groove space 14W is located at a position corresponding to each tread circumferential groove 3v and the tire radial direction, respectively, and hinders the shortest heat transfer along the tire radial direction R to prevent all tread circumferential directions. Vulcanization of the peripheral portion of the groove 3v can be suppressed.

Next, the tire vulcanization molding apparatus 30 of the second embodiment of the present invention will be described with reference to FIGS. 11 to 18.
The tire vulcanization molding apparatus 30 is the same as the tire vulcanization molding apparatus 10 of the first embodiment except for the molding mold 32 and the holder member 35 of the tire forming die 31, and the same members use the same reference numerals. I will do it.

In the second embodiment, the tread portion 3 is provided with a heat insulating portion 35S that prevents heat transfer along the inner peripheral surface 35i of the holder member 35 that transfers heat via the molding mold 32.
The heat insulating portion 35S is a circumferential groove space 35S that opens in the inner peripheral surface 35i of the holder member 35 and extends in the tire circumferential direction. Circumferential groove spaces 35S and 35S are formed at positions corresponding to the upper two tread circumferential grooves 3v and 3v of the tread portion 3 of the raw tire 1 in the tire radial direction R, respectively.

As shown in FIG. 14, the circumferential groove space 35S expands in diameter in the tire radial direction R from the tread circumferential groove 3v formed in the annular shape of the tread portion 3 of the raw tire 1, and is the inner circumference of the holder member 35. It is formed in a ring shape along the surface 35i.

With reference to FIG. 12, the circumferential groove space 35S opened in the inner peripheral surface 35i of the holder member 35 has a rectangular cross section, and the width D in the tire width direction at the opening surface of the circumferential groove space 35S. Is twice the width length d of the tread circumferential groove 3v on the tread surface.
Although the molding mold 32 does not have a circumferential groove space, a circumferential ridge portion 32p that forms a tread circumferential groove 3v is formed on the inner peripheral surface 32i.

When the tire molding mold 31 is heated from the outside in the state shown in FIG. 11 in which the raw tire 1 is molded by the tire molding mold 31, the raw tire 1 is raw from the heated holder member 35 via the molding mold 32. While heat is transferred to the tread portion 3 of the tire 1, the circumferential groove which is a heat insulating portion is connected to the heat transfer route along the tire radial direction R which is the shortest to transfer heat to the upper two tread circumferential grooves 3v and 3v, respectively. Space 35S intervenes and hinders heat transfer.

In the case of the tire molding mold 11 of the tire vulcanization molding apparatus 10 of the second embodiment, the lower side of the holder member 35 is cooled from the upper side like the molding mold 14 by opening the mold, and each addition during continuous production. In vulcanization molding, the initial temperature of the lower side of the holder member 35 is lower than that of the upper side, and the vulcanization of the upper side of the tread portion 3 heated by the upper side having a higher initial temperature tends to proceed more. The tread is prevented from transferring heat during heating by interposing the circumferential groove space 35S along the inner peripheral surface 35i of the holder member 35 in the heat transfer route that transfers to the upper two tread circumferential grooves 3v at the shortest time. The peripheral parts of the upper two tread circumferential grooves 3v of the part 3 suppress the progress of vulcanization from other parts, prevent partial overvulcanization, and rubber of each part of the tire. It is possible to homogenize the physical properties of the tire and maintain high tire performance.

Since the holder member 35 is made of iron and has a lower thermal conductivity than an aluminum alloy and is difficult to equalize heat, and has a large thickness in the tire radial direction, the heat capacity can be increased by changing the depth of the circumferential groove space 35S in the tire radial direction. It can be greatly reduced, and by installing the circumferential groove space 35S in the heat transfer route that transfers to the upper two tread peripheral grooves 3v of the holder member 35 in the shortest time, the upper two tread portions 3 It is possible to effectively prevent the peripheral portion of the tread circumferential groove 3v from being overvulcanized more than other portions.

In the second embodiment, the width length D in the tire width direction at the opening surface of the circumferential groove space 35S is twice the width length d at the tread surface of the tread circumferential groove 3v, but the volume. Considering the specific heat and the heat transfer rate, if the width D of the circumferential groove space 35S is 1 to 4 times the width d of the tread circumferential groove 3v, the above effect can be expected.

The circumferential groove space 35S formed on the inner peripheral surface 35i of the holder member 35 has a rectangular cross section, but in the example shown in FIG. 15, the circumferential groove space 35T has a trapezoidal cross section.
Even if the cross section of the circumferential groove space 35T is trapezoidal, if the width of the long base of the trapezoid is 1 to 4 times the width length d of the tread circumferential groove 3v, heat transfer is hindered and the tread portion 3 It is possible to prevent the peripheral portion of the upper two tread circumferential grooves 3v from being overvulcanized.
If the cross section of the circumferential groove space is trapezoidal, the strength of the holder member 35 is structurally increased.

Further, a modification of the circumferential groove space of the inner peripheral surface 35i of the holder member 35 will be shown and described with reference to FIGS. 16 and 17.
In the tire molding die 31 shown in FIG. 16, in the circumferential groove space 35U formed on the inner peripheral surface 35i of the holder member 35, the above-mentioned adjacent circumferential groove spaces 35S and 35S are partially overlapped and integrated with each other. It was formed in.

The transfer of heat to the region including the peripheral parts of the upper adjacent tread circumferential grooves 3v, 3v is suppressed, and vulcanization is more likely to proceed in the upper adjacent tread circumferential grooves 3v, 3v. The heat transfer to each peripheral part of the tire is suppressed, the vulcanization on the upper side of the tread portion 3 is prevented from progressing particularly as compared with the other parts, and the partial overvulcanization is prevented. It is possible to homogenize the physical properties of rubber in each part of the tire and maintain high tire performance.
Further, since the adjacent circumferential groove spaces are partially overlapped with each other and formed integrally, the number of the circumferential groove spaces can be reduced and the holder member 35 can be easily machined and formed.

The holder member 35 of the tire forming die 31 shown in FIG. 17 has a circumferential groove space 35V in which the cross-sectional shape of the circumferential groove space 35U shown in FIG. 16 is modified.
The circumferential groove space 35V has a larger radial direction width on the upper side than on the lower side in the vertical direction, which is the tire width direction.

Since the vulcanization of the upper side of the tread portion 3 heated by the upper side where the initial temperature of the holder member 35 is high progresses due to the mold opening, the upper side of the circumferential groove space 35V which hinders the heat transfer during heating is the tire from the lower side. By increasing the width in the radial direction, the peripheral portion of the tread circumferential groove 3v at or near the uppermost portion on the upper side suppresses the progress of vulcanization more than other regions, resulting in partial overvulcanization. It can be prevented.

Due to the structure of the tire vulcanization molding apparatus 30, unless the initial temperature of the lower side of the holder member 35 is lower than that of the upper side due to mold opening, the inner peripheral surface 35i of the holder member 35 is biased to one side in the tire width direction. There is no need to provide a circumferential groove space.

In such a case, as shown in FIG. 18, all the tread peripheral grooves 3v of the tread portion 3 of the raw tire 1 on the inner peripheral surface 35i of the holder member 35 and the positions corresponding to the tire radial directions are all located. A circumferential groove space of 35 W may be formed.
That is, each circumferential groove space 35W is located at a position corresponding to each tread circumferential groove 3v and the tire radial direction, respectively, and hinders the shortest heat transfer along the tire radial direction R to prevent all tread circumferential directions. Vulcanization of the peripheral portion of the groove 3v can be suppressed.

Next, the tire vulcanization molding apparatus 40 according to the third embodiment of the present invention will be described with reference to FIGS. 19 and 20.
The tire vulcanization molding apparatus 40 is the same as the tire vulcanization molding apparatus 30 of the second embodiment except for the holder member 45 of the tire forming die 41, and the same members use the same reference numerals.

In the third embodiment, the heat insulating portion 45S that hinders heat transfer is provided along the outer peripheral surface 45o of the holder member 45 while heat is being transferred from the outer ring 25 to the tread portion 3 via the holder member 45 and the molding mold 32. It is installed internally.

The heat insulating portion 45S is a circumferential groove space 45S that opens in the outer peripheral surface 45o of the holder member 45 and extends in the tire circumferential direction. One common circumferential groove space 45S is formed at a position corresponding to the two tread circumferential grooves 3v, 3v on the upper side of the tread portion 3 of the tire 1 in the tire radial direction R.

As shown in FIG. 20, the circumferential groove space 45S is a holder member whose diameter is expanded in the tire radial direction R from both the tread circumferential grooves 3v and 3v formed in the annular shape of the tread portion 3 of the raw tire 1. It is formed in an annular shape along the outer peripheral surface 45o of 35.
The width of the circumferential groove space 45S in the tire width direction is large, and both the tread circumferential grooves 3v and 3v can be surrounded from the outside.

When the tire molding die 41 is heated from the outside in the state shown in FIG. 19 in which the raw tire 1 is molded by the tire molding die 41, the raw tire 1 is raw from the heated holder member 45 via the forming mold 42. While heat is transferred to the tread portion 3 of the tire 1, the circumferential groove space which is a heat insulating portion is connected to the heat transfer route along the tire radial direction R which is the shortest to transfer heat to the upper two tread circumferential grooves 3v and 3v. 45S intervenes and hinders heat transfer.

In the case of the tire molding mold 41 of the tire vulcanization molding apparatus 40 of the third embodiment, as described above, the initial temperature of the lower side of the holder member 35 is lower than that of the upper side due to the opening of the mold, and the initial temperature. Since the vulcanization of the upper side of the tread portion 3 heated by the higher upper side tends to proceed more, the holder member 45 is connected to the heat transfer route that is transmitted to the two upper tread circumferential grooves 3v of the tread portion 3 in the shortest time. By interposing the circumferential groove space 45S along the outer peripheral surface 45o of the tire to prevent heat transfer during heating, the peripheral portion of the upper two tread circumferential grooves 3v is vulcanized more than the other portions. By suppressing it, it is possible to prevent partial overvulcanization, homogenize the physical properties of rubber in each part of the tire, and maintain high tire performance.

Next, the tire vulcanization molding apparatus 50 according to the fourth embodiment of the present invention will be described with reference to FIGS. 21 and 23.
The tire vulcanization molding apparatus 50 is the same as the tire vulcanization molding apparatus 10 of the first embodiment except for the forming mold 52 of the tire forming die 51, and the same members use the same reference numerals.

The tread circumferential groove 3v of the tread portion 3 of the raw tire 1 is formed by the circumferential ridge portion 52p formed by extending in the circumferential direction on the inner peripheral surface 52i of the molding mold 52 (see FIGS. 22 and 23). ..
In the fourth embodiment, the heat insulating portion 52S is internally provided inside the circumferential ridge portion 52p extending in the circumferential direction on the inner peripheral surface 52i of the molding mold 52.

The heat insulating portion 52S is a circumferential hole space 52S formed so as to extend in the circumferential direction along the circumferential ridge portion 52p extending in the circumferential direction, and is a tire forming mold with reference to FIG. 21. In the molded state of 51, the circumferential hole space 52S has two annular ridges on the upper side forming the two upper tread peripheral grooves 3v and 3v of the tread portion 3 of the raw tire 1. It is installed in a ring shape at 52p and 52p.

That is, with reference to FIGS. 21 and 22, the circumferential hole space 52S is the tread circumferential groove 3v formed by the upper circumferential ridge 52p and the tire in the molded state of the tire forming die 51. It is provided at a corresponding position in the radial direction R.

With reference to FIG. 23, the circumferential hole space 52S formed inside the circumferential ridge 52p of the molding mold 52 has a triangular shape whose cross section tapers toward the tip of the circumferential ridge 52p. The width length D in the tire width direction of the base end side bottom of the cross-sectional triangle of the same circumferential hole space 52S is 0.6 times the width length d on the tread surface of the tread circumferential groove 3v.

When the tire molding die 31 is heated from the outside in the state shown in FIG. 21 in which the raw tire 1 is molded by the tire molding die 31, the raw tire 1 is raw from the heated holder member 35 via the forming mold 32. While heat is transferred to the tread portion 3 of the tire 1, heat is interposed in the heat transfer route that transfers heat to the upper two tread circumferential grooves 3v and 3v, respectively, with the circumferential hole space 52S as a heat insulating portion. Is hindering the transmission of tires.

In the case of the tire molding mold 51 of the tire vulcanization molding apparatus 50 of the fourth embodiment, as described above, the initial temperature of the molding mold 14 is higher than the lower side due to the mold opening, and the four treads. Of the circumferential grooves 3v, the peripheral parts of the upper two tread peripheral grooves 3v are particularly prone to overvulcanization due to the progress of vulcanization. Circumferential hole space 52S, which is a heat insulating portion, is internally provided in the circumferential ridge 52p of the molding mold 52 in the heat transfer route that transfers the shortest, thereby hindering heat transfer, thereby preventing the heat transfer from the two upper tread circumferential grooves. The peripheral part of 3v suppresses the progress of vulcanization from other parts, prevents partial over-vulcanization, and homogenizes the physical properties of rubber in each part of the tire to improve the performance of the tire. Can be kept high.

In the fourth embodiment, the width D in the tire width direction of the circumferential hole space 52S is 0.6 times the width d in the tread surface of the tread circumferential groove 3v, but the circumferential protrusion portion. Considering the strength such as the wall thickness from the surface of 52p to the inner wall of the circumferential hole space 52S, the width D of the circumferential hole space 52S should be 0.4 to 0.8 times the width d of the tread peripheral groove 3v. If so, the above effect can be expected.
The circumferential hole space 52S provided in the circumferential ridge portion 52p of the molding mold 52 has a triangular cross section, but the cross section may be trapezoidal or circular.

The circumferential hole space 52S can be formed by a laminated molding method using a 3D printer.
Further, when the molding mold 52 is cast, it is possible to form the circumferential hole space 52S by the core.

Next, when the tread groove formed in the tread portion of the tire is a tread width direction groove extending in the tire width direction, the tire addition of the fifth embodiment to which the present invention is applied to the tread width direction groove. An example of the vulcanization molding apparatus 80 will be shown and described with reference to FIGS. 24 to 27.

With reference to FIG. 25, the raw tire 71 vulture-molded by the tire molding die 81 of the tire scouring molding apparatus 80 has a carcass layer (not shown) erected between the pair of bead rings 72 and 72 in a toroidal shape. ) Is used as a skeleton, and the tread portion 73 is circumscribed on the outer peripheral surface of the belt layer (not shown) that is peripherally contacted on the outer side of the carcass layer in the tire radial direction. A pair of sidewall portions 75, 75 extend through the shoulder portions 74, 74, and the bead rings 72, 72 are embedded at the inner inner peripheral ends of the pair of sidewall portions 75, 75 in the tire radial direction to move up and down. A pair of bead portions 76, 76 is formed.

Then, referring to FIGS. 25 and 26, the tread portion 73 of the raw tire 71 is provided with a lug groove 73l and a sipe 73s, which are grooves in the tread width direction, in addition to the tread circumferential groove 73v.
The lug groove 73l extends in the tire width direction toward the shoulder portion 74 of the tread portion 73.
The sipe 73s is a notch extending in the tire width direction mainly between the adjacent tread circumferential grooves 73v and 73v.

The tire forming die 81 of the tire vulcanization forming apparatus 80 includes a pair of side molds 82 and 83 for forming a pair of sidewall portions 75 and 75 of the raw tire 71, and a tread portion 73 and a shoulder portion 74 of the raw tire 71. It is equipped with a molding mold 84 for molding.

With reference to FIG. 25, the molding mold 84 has a circumferential ridge 84p for forming a tread circumferential groove 73v and a width ridge 84l for forming a lug groove 73l on an inner peripheral surface 84i which is a design surface. Is formed, and a blade 85, which is a widthwise ridge portion forming the sipe 73s, is planted.

The tread pattern of the tread portion 73 of the raw tire 71 is vulcanized by the inner peripheral surface (design surface) 84i of the molded mold 84, and the widthwise ridge portion of the inner peripheral surface 84i of the molded mold 84 in the tread portion 73. The temperature around the lug groove 73l and the sipe 73s, where the 84l and the blade 85 bite, respectively, is higher than the other parts during vulcanization, and the vulcanization tends to proceed too much.

Therefore, in the fifth embodiment, the heat insulating portions 84X and 84Y that hinder the heat transfer are internally provided in the molding mold 84 that transfers heat to the tread portion 73.
The heat insulating portions 84X and 84Y are widthwise groove spaces 84X and 84Y that open in the outer peripheral surface 84o of the molding mold 84 and extend in the tire width direction. In this state, a widthwise groove space 84X is formed at a position corresponding to each lug groove 73l of the tread portion 73 of the raw tire 71 in the tire radial direction R, respectively, and at a position corresponding to each sipe 73s in the tire radial direction R. A groove space 84Y in the width direction is formed in each.

With reference to the cross-sectional views of FIGS. 24 and 25, the widthwise groove spaces 84X and 84Y are formed so as to open into the outer peripheral surface 84o of the molding mold 84 and be excavated deeply into a rectangular shape from the outer peripheral surface 84o. The cross-sectional area of the widthwise groove space 84X is larger than the cross-sectional area of the lug groove 73l, and the cross-sectional area of the widthwise groove space 84Y is larger than the cross-sectional area of the sipe 73s.
Various shapes can be applied to the cross-sectional shapes of the groove spaces 84X and 84Y in the width direction.
Further, in contrast with FIGS. 26 and 27, the circumferential width of the widthwise groove space 84X is larger than the circumferential width of the lug groove 73l, and the circumferential width of the widthwise groove space 84Y is the circumferential width of the sipe 73s. Greater.

When the tire molding die 81 is heated from the outside in the state shown in FIG. 24 in which the raw tire 71 is molded by the tire molding die 81, the tread of the raw tire 71 is passed through the heated molding die 84. While heat is being transferred to the portion 73, the widthwise groove spaces 84X and 84Y, which are heat insulating portions, are interposed in the heat transfer route along the tire radial direction R, which is the shortest to transfer heat to the lug groove 73l and the sipe 73s, respectively. It interferes with heat transfer.

As described above, in the tread portion 73 of the raw tire 71, the peripheral parts of the lug groove 73l and the sipe 73s are particularly prone to overvulcanization, so that the peripheral parts of the lug groove 73l and the sipe 73s are respectively. By interposing the groove spaces 84X and 84Y in the width direction of the molding mold 84 in the heat transfer route that transfers the shortest time to prevent heat transfer during heating, each peripheral part of the lug groove 73l and the sipe 73s is vulcanized from other parts. It is possible to suppress the progress of tire tread, prevent partial overvulcanization, homogenize the physical properties of rubber in each part of the tire, and maintain high tire performance.

As in the above embodiment, the molded mold 84 is opened at the position corresponding to the tread circumferential groove 73v of the tread portion 73 of the raw tire 71 in the tire radial direction R on the outer peripheral surface 84o of the molded mold 84. , Circumferential groove space 84S is formed.

The tire vulcanization molding apparatus according to the five embodiments according to the present invention has been described above, but the embodiment of the present invention is not limited to the above embodiment, and is carried out in various embodiments within the scope of the gist of the present invention. It includes things.

For example, in the above-described embodiment, the heat insulating portion is used as a groove space, but a heat insulating member such as silicon rubber may be used as the heat insulating portion.
Further, in the above-described embodiment, the heat insulating portion is provided on either one of the molding mold and the holder member, but the heat insulating portion may be provided on both the molding mold and the holder member.
The molding mold can also be applied to metals such as iron other than aluminum alloys.

Lc ... tire rotation center axis, R ... tire radial direction,
1 ... raw tire, 2 ... bead ring, 3 ... tread part, 3v ... tread circumferential groove, 4 ... shoulder part, 5 ... sidewall part, 6 ... bead part,
10 ... Tire vulcanization molding equipment, 11 ... Tire molding mold, 12 ... Lower side mold, 13 ... Upper side mold, 14 ... Molding mold, 14i ... Inner peripheral surface, 14p ... Circumferential ridge, 14o ... Outer circumference Surface, 14S, 14T, 14U, 14V, 14W ... Circumferential groove space, 15 ... Bead mold,
20 ... holder member, 20i ... inner peripheral surface, 21 ..., 22 ... lower container, 23 ... upper container, 25 ... outer ring, 26 ... bladder, 27 ... clamp member,
30 ... Tire vulcanization molding equipment, 31 ... Tire molding mold, 32 ... Molding mold, 32p ... Circumferential ridge, 35 ... Holder member, 35i ... Inner peripheral surface, 35S ... Circumferential groove space,
40 ... Tire vulcanization molding equipment, 41 ... Tire molding mold, 42 ... Molding mold, 45 ... Holder member, 45o ... Outer surface, 45S ... Circumferential groove space,
50 ... Tire vulcanization molding equipment, 51 ... Tire molding mold, 52 ... Molding mold, 52i ... Inner peripheral surface, 52p ... Circumferential ridge, 52S ... Circumferential hole space,
70 ..., 71 ... raw tires, 72 ... bead ring, 73 ... tread part, 73v ... tread circumferential groove, 73l ... lug groove, 73s ... sipes, 74 ... shoulder part, 75 ... sidewall part, 76 ... bead part,
80 ... Tire vulcanization molding equipment, 81 ... Tire molding mold, 82, 83 ... Side mold, 84 ... Molding mold, 84i ... Inner peripheral surface, 84o ... Outer peripheral surface, 84p ... Circumferential ridge, 84S ... Circumferential Directional groove space, 84l ... width direction ridge, 84X, 84Y ... width direction groove space, 85 ... blade.

Claims (4)

A pair of side molds (12,13) that form a pair of sidewall portions (5) of a tire,
A tire molding die (41) is composed of a molding mold (32) for molding a tread portion (3) and a shoulder portion (4,74) of a tire.
A holder member (45) for holding the molded mold (32) in contact with the outer peripheral surface (14o) opposite to the inner peripheral surface (32i) which is the design surface of the molded mold (32) is provided.
In the tire vulcanization molding apparatus (40) in which the heated tire molding die (41) is molded and the raw tire (1) is pressed from the outside to vulcanize the raw tire (1).
A heat insulating portion (45S) is internally provided in at least one of the molding mold (32) and the holder member (45).
The heat insulating portion (45S) is the tread portion (3) of the tire due to the ridge portion (32p) of the inner peripheral surface (32i) of the molding mold (32) in the molded state of the tire molding die (11). It is provided at the position corresponding to the tread groove (3v) formed in the tire radial direction (R) .
The tread groove (3v) is a tread circumferential groove (3v) extending in the circumferential direction of the tread portion (3) of the tire.
The heat insulating portion (45S) is a circumferential groove space (45S) that is internally provided in the holder member (45), opens in the outer peripheral surface (45o) of the holder member (45), and extends in the tire circumferential direction. A tire vulcanization molding device characterized by. The tire vulcanization molding apparatus according to claim 1 , wherein the heat insulating portions (14S) adjacent to each other are partially overlapped with each other and integrally formed. A pair of side molds (12,13) that form a pair of sidewall portions (5) of a tire,
A tire molding die (51) is composed of a molding mold (52) for molding a tread portion (3) and a shoulder portion (4,74) of a tire.
A holder member (45) for holding the molded mold (52) in contact with the outer peripheral surface (14o) opposite to the inner peripheral surface (32i) which is the design surface of the molded mold (52) is provided.
In the tire vulcanization molding apparatus (50) in which the heated tire molding die (51) is molded and the raw tire (1) is pressed from the outside to vulcanize the raw tire (1).
A heat insulating portion (52S) is internally provided in at least one of the molding mold (52) and the holder member (20).
The heat insulating portion (52S) is the tread portion (3) of the tire due to the ridge portion (52p) of the inner peripheral surface (52i) of the molding mold (52) in the molded state of the tire molding die (11). It is provided at the position corresponding to the tread groove (3v) formed in the tire radial direction (R) .
The tread groove (3v) is a tread circumferential groove (3v) extending in the circumferential direction of the tread portion (3) of the tire.
The heat insulating portion (52S) is inside the ridge portion (52p) extending in the circumferential direction of the inner peripheral surface (52i) of the molding mold (52) forming the tread circumferential groove (3v). A tire vulcanization molding device characterized by being an internally installed circumferential hole space (52S) . In the tire molding die (41, 51), the pair of side molds (12, 13) are arranged one above the other to form an upper side mold (13) and a lower side mold (12), and the lower side mold is used. (12) supports one sidewall portion (5) which is the lower side of the raw tire (1) from below, and the upper side mold (13) is the other side which is the upper side of the raw tire (1). The wall portion (5) is pressed from above, and the molded mold (32, 52) presses the tread portion (3) and the shoulder portion (4) of the raw tire (1) from the outside to form a mold.
Of the tread circumferential grooves (3v) formed in parallel in the vertical direction, which is the tire width direction, of the tread portion (3) of the tire molded by the tire molding mold (41, 51). One of claims 1 to 3 , wherein the heat insulating portion (45S, 52S) is provided at a position corresponding to the upper tread circumferential groove (3v) and the tire radial direction (R). The tire vulcanization molding apparatus described in 1.

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