JP2020179562A - Tire vulcanizer - Google Patents

Abstract

To provide a tire vulcanizer having a simple structure while having heat suppressing means.SOLUTION: A tire vulcanizer 1 includes: a mold 2 with a plurality of sector molds 6; a container 3 having heating means 13 for heating the mold 2; and heat suppression means 4 that suppresses heating of a center part of the sector mold 6 including a tire equator C. The heat suppression means 4 includes: a supply port 21 arranged in the sector mold 6 and supplying to a main flow path 20 through which a cooling fluid R flows; and a discharge port 22 discharging the cooling fluid R from the main flow path 20. The supply port 21 and the discharge port 22 are arranged on an outer surface 9a in a tire radial direction of a holder 9 holding the sector mold 6 and below the tire equator C.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tire vulcanizer including a heat suppressing means.

For example, Patent Document 1 below describes a tire vulcanizer for vulcanizing raw tires. The tire vulcanizer includes a mold unit into which the raw tire is loaded, a jacket as a heating means for covering the mold unit, and a pipeline embedded in the mold unit. A cooling water generator for generating cooling water is connected to the pipeline via a pipe, and the cooling water generated by the cooling water generator circulates in the pipeline. Such a tire vulcanizer can partially change the degree of vulcanization of the raw tire.

JP-A-11-165320

However, Patent Document 1 has not been studied for facilitating the structure of the tire vulcanizer.

Therefore, an object of the present invention is to provide a tire vulcanizer having a simple structure while having a heating suppressing means.

The present invention is a tire vulcanizer, which comprises a mold having a plurality of sector molds arranged in the tire circumferential direction and upper and lower side molds, a container having a heating means for heating the mold, and a container. The container includes a heating suppressing means for suppressing heating of the center portion including the tire equatorial line of the sector mold, the container has a plurality of holders for holding the sector mold, and the heating suppressing means is contained in the sector mold. The supply port and the discharge port include a main flow path that is arranged and through which the cooling fluid flows, a supply port that supplies the cooling fluid to the main flow path, and a discharge port that discharges the cooling fluid from the main flow path. Is arranged on the outer surface of the holder in the tire radial direction and below the tire equatorial line.

In the tire vulcanizer according to the present invention, it is desirable that the main flow path extends in the tire circumferential direction.

In the tire vulcanizer according to the present invention, it is desirable that the supply port and the discharge port are arranged below the main flow path.

In the tire vulcanizer according to the present invention, the heating suppressing means connects the main flow path and the supply port to the first sub-flow path, and the main flow path and the discharge port to each other. It is desirable that the first sub-channel and the second sub-channel extend linearly with each of the flow paths.

In the tire vulcanization apparatus according to the present invention, the heating suppressing means sequentially connects the supply port of one holder and the discharge port of the other holder in the holders adjacent to each other in the tire circumferential direction. It is desirable that a cooling fluid supply source is interposed in one of the plurality of connecting pipes.

The tire vulcanizer according to the present invention includes an actuator ring in which the container moves the sector mold in the radial direction via the holder by moving up and down, and the lower end portion of the actuator ring includes the connecting pipe. It is desirable that a notch is arranged to avoid contact with the tire.

In the tire vulcanizer according to the present invention, the center of the cross section of the main flow path is arranged on both sides of the tire equatorial line in the tire axial direction within 20% of the width of the tread molding surface of the sector mold. Is desirable.

In the tire vulcanizer according to the present invention, it is desirable that the temperature of the cooling fluid is 100 to 160 ° C. and the pressure of the cooling fluid at the supply port is 0.4 to 0.6 MPa.

The tire vulcanizer according to the present invention has the one according to any one of claims 1 to 8, wherein the maximum width of the cross section of the main flow path is 10% to 30% of the width of the tread molding surface of the sector mold. It is a tire vulcanizer.

In the tire vulcanizer according to the present invention, it is desirable that the distance a from the main flow path to the tread molding surface of the sector mold is 10 to 30 mm.

In the tire vulcanizer according to the present invention, it is desirable that the distance b from the main flow path to the end face of the sector mold in the tire circumferential direction is 10 to 30 mm.

The tire vulcanizer of the present invention includes a mold having a sector mold, a container having a heating means for heating the mold, and a heating suppressing means for suppressing heating of the sector mold. The container has a holder for holding the sector mold. The heating suppressing means are arranged in the sector mold, and has a main flow path through which the cooling fluid flows, a supply port for supplying the cooling fluid to the main flow path, and a discharge port for discharging the cooling fluid from the main flow path. And is included. The supply port and the discharge port are arranged on the outer surface of the holder in the radial direction of the tire and below the equator of the tire.

As a result, for example, the connection pipe extending from the supply port to the outside of the holder and the connection pipe extending from the discharge port to the outside of the holder are below the tire equator of the container having a relatively simple structure. Can be placed on the side. As a result, the structure of the container is not complicated. Therefore, the tire vulcanizer of the present invention can have a simple structure while having a heating suppressing means.

It is a partial cross-sectional view of the reduced diameter state of the tire vulcanizing apparatus of one Embodiment of this invention. It is a partial sectional view of the tire vulcanizer in the expanded state. It is a cross-sectional view of a sector mold and a holder. (A) is a cross-sectional view of the sector mold and the holder cut in the vertical direction, and (b) is a front view of the sector mold as viewed from the inner surface side. It is a partial perspective view of a container, a sector mold and a lower plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional view of a tire vulcanizer (hereinafter, may be simply referred to as “device”) 1 showing an embodiment of the present invention. In the present embodiment, the device 1 performs external heating for heating the outer surface side of the unvulcanized tire (hereinafter, may be simply referred to as “tire”) T and internal heating for heating the inner cavity surface side of the tire T. It is something to do.

In the device 1 of the present embodiment, for example, the pneumatic tire T for heavy load is preferably vulcanized. In this type of tire T, for example, the rubber thickness of the center portion of the tread portion Ta including the tire equator C is formed to be larger than the rubber thickness of the shoulder portion on the tread end side of the tread portion Ta. The present invention can also be applied to a device 1 for vulcanizing a pneumatic tire T for a passenger car, a motorcycle, or the like.

The device 1 of the present embodiment includes a mold 2, a container 3, and a heating suppressing means 4. In the device 1 of the present embodiment, the tire T is horizontally held in the mold 2 and vulcanized. Therefore, in the present specification, the tire axial direction is the same as the vertical (vertical) direction, and is indicated by an arrow Z in FIG. Further, the radial direction of the tire is the same as the horizontal direction, and is indicated by an arrow X in FIG.

The device 1 further includes a bladder 5. The bladder 5 performs the internal heating. Since the bladder 5 has a well-known structure in the present embodiment, the description thereof will be omitted.

The mold 2 of the present embodiment includes a plurality of sector molds 6 arranged in the tire circumferential direction, and upper and lower side molds 7U and 7L.

The sector mold 6 has, for example, an inward surface 6a facing inward in the radial direction of the tire and a pair of end surfaces (shown in FIG. 3) 6b and 6b arranged on both end surfaces of the inward surface 6a in the tire circumferential direction. There is. In the present embodiment, the inward surface 6a is arranged on both sides of the tread forming surface 15 in contact with the tread portion Ta of the tire T and the tread forming surface 15 in the tire axial direction, and extends in the vertical axial direction along the tire axial direction. It has surfaces 16U and 16L. The end faces 6b of the sector molds 6 adjacent to each other in the tire circumferential direction are joined to each other to form an annular shape of the sector molds 6 to form a vulcanized reduced diameter state Y1 (shown in FIG. 1). Each sector mold 6 in the reduced diameter state Y1 is concentric with the rotation axis Tc of the tire T. Further, each sector mold 6 in the reduced diameter state Y1 is moved outward in the radial direction of the tire to form an enlarged diameter state Y2 (shown in FIG. 2) separated from each other. The sector mold 6 is composed of, for example, 8 or 9 pieces.

As shown in FIGS. 1 and 2, the upper side mold 7U comes into contact with, for example, the upper sidewall portion Tb of the horizontally placed tire T. In the reduced diameter state Y1, the upper side mold 7U comes into contact with, for example, the upper axial surface 16U and is combined with the sector mold 6. The lower side mold 7L comes into contact with, for example, the lower sidewall portion Tb of the tire T. In the reduced diameter state Y1, the lower side mold 7L comes into contact with, for example, the lower axial surface 16L and is combined with the sector mold 6. As the upper and lower side molds 7U and 7L, those having a well-known ring-shaped structure are adopted in the present embodiment.

The container 3 of the present embodiment includes upper and lower plates 8U and 8L, a plurality of holders 9 arranged in the tire circumferential direction, an actuator ring 10, upper and lower platens 11U and 11L, an elevating means 12, and a heating means 13. And is included.

The upper plate 8U of this embodiment holds the upper side mold 7U. The upper plate 8U is made movable in the vertical direction, for example. The lower plate 8L of this embodiment holds the lower side mold 7L. As the upper and lower plates 8U and 8L, those having a well-known structure are adopted in the present embodiment.

The holder 9 of this embodiment holds the sector mold 6. Each holder 9 has, for example, an outer surface 9a facing outward in the tire radial direction, an inner surface 9b that is in contact with the sector mold 6 and facing inward in the tire radial direction, and both ends of the outer surface 9a and the inner surface 9b in the tire circumferential direction. It has a pair of circumferential surfaces 9c (shown in FIG. 3) to be joined. In this embodiment, the holders 9 are arranged side by side in the tire circumferential direction. In the reduced diameter state Y1, each holder 9 is formed as an annular body concentric with the rotation axis Tc of the tire T by joining the circumferential surfaces 9c of the holders 9 adjacent to each other in the tire circumferential direction.

For example, the same number of holders 9 as the sector molds 6 are provided, and one sector mold 6 is attached to one holder 9. A plurality of sector molds 6 may be attached to one holder 9. In the reduced diameter state Y1, the holder 9 comes into contact with, for example, the upper and lower plates 8U and 8L.

The outer surface 9a includes, for example, a main portion 14A that is inclined with respect to the tire axial direction, and a sub portion 14B that is connected to the lower end of the main portion 14A and extends along the tire axial direction. In the present embodiment, the main portion 14A is inclined inward in the radial direction of the tire toward the upper side. The outer surface 9a is not limited to such an embodiment, and may be formed only by the main portion 14A, for example.

The actuator ring 10 of the present embodiment is an annular body that surrounds each holder 9 and is arranged concentrically with the rotation shaft Tc of the tire T. The actuator ring 10, for example, connects the inner side surface 10a facing inward in the radial direction of the tire, the outer surface 10b facing outward in the radial direction of the tire, and the inner side surface 10a and the outer surface 10b, and faces downward in the vertical direction. It has a surface 10c.

The inner side surface 10a of the present embodiment has an inclined portion 17 that is inclined with respect to the tire axial direction. In the present embodiment, the inclined portion 17 is formed in a conical shape having the same inclination as the main portion 14A. The downward surface 10c forms the lower end portion of the actuator ring 10 in the present embodiment.

The actuator ring 10 is formed so as to extend outward from the tread forming surface 15 of the sector mold 6 in the tire axial direction in the reduced diameter state Y1, for example, and the width of the tread forming surface 15 (the length in the tire axial direction). Has a larger vertical length.

The inner side surface 10a of the actuator ring 10 and the outer surface 9a of the holder 9 are provided with engaging means having a well-known structure including, for example, an engaging projection and an engaging groove (not shown). Such an engaging means holds the actuator ring 10 and the holder 9 so that the holder 9 can slide along the inner side surface 10a.

The upper platen 11U holds, for example, the actuator ring 10. The lower platen 11L holds, for example, the lower plate 8L. The lower platen 11L is fixed to the table base 18 in this embodiment.

In the present embodiment, the elevating means 12 includes a first moving table 12A for holding the upper platen 11U and a second moving table 12B for holding the upper plate 8U. Each of the first moving table 12A and the second moving table 12B is held so as to be able to move up and down in the vertical direction by, for example, a well-known drive unit having a cylinder structure (not shown). By raising and lowering the first moving table 12A, the actuator ring 10 and the upper platen 11U can be moved in the vertical direction. By raising and lowering the actuator ring 10 by the first moving table 12A, the holder 9 engaged with the engaging means and the sector mold 6 fixed to the holder 9 are moved in the radial direction of the tire and in the vertical direction. By raising and lowering the second moving table 12B, the upper plate 8U and the upper side mold 7U can be moved in the vertical direction.

The heating means 13 includes, for example, a heating fluid supply source (not shown), a first jacket J1, a second jacket J2, and a flow path (not shown). The heating fluid supply source may supply, for example, a heating fluid N composed of high-temperature and high-pressure steam (saturated steam). In the present embodiment, the heating fluid supply source has a boiler having a well-known structure, and is provided, for example, on the outside of the container 3. The flow path connects, for example, the heating fluid supply source with the first jacket J1 and the second jacket J2. The heating fluid supply source may be, for example, one that supplies a high-temperature and high-pressure gas (inert gas) or one that heats the mold 2 with an electric heater.

The first jacket J1 is arranged inside the actuator ring 10, for example. The second jacket J2 is arranged inside, for example, the upper and lower platens 11U and 11L, respectively. By supplying the heating fluid N from the heating fluid supply source to the first jacket J1, the actuator ring 10 is heated and heat is transferred to the sector mold 6 via the holder 9, and the tread portion Ta is mainly used. Is vulcanized. By supplying the heating fluid N from the heating fluid supply source to the second jacket J2, the upper and lower platens 11U and 11L are heated to the upper and lower side molds 7U and 7L via the upper and lower plates 8U and 8L. The sidewall portion Tb is mainly vulcanized by heat transfer. For the temperature and pressure of the heating fluid N, for example, well-known values are adopted.

In the present embodiment, the first jacket J1 is formed so as to extend in the vertical direction. The lower end of the first jacket J1 is located, for example, near the lower end of the actuator ring 10. In the present embodiment, in the reduced diameter state Y1, the lower end of the first jacket J1 is located below the tire equator C of the tire T.

FIG. 3 is a cross-sectional view of the sector mold 6 and the holder 9 for showing an outline of the heating suppressing means 4. FIG. 3 is a view cut along the tire equator C, for example, in the reduced diameter state Y1. FIG. 4A is a cross-sectional view (partially enlarged view of FIG. 1) in which the sector mold 6 and the holder 9 for showing an outline of the heating suppressing means 4 are cut in the vertical direction, and FIG. 4B is an inward view of the sector mold 6. It is a front view seen from the surface 6a side. As shown in FIG. 3 or 4, the heating suppressing means 4 of the present embodiment has a main flow path 20 through which the cooling fluid R flows, a supply port 21 for supplying the cooling fluid R to the main flow path 20, and a cooling fluid R. It includes a discharge port 22 for discharging from the main flow path 20. In this embodiment, the main flow path 20 is arranged in the sector mold 6 of the mold 2.

The cooling fluid R has, for example, a temperature lower than the temperature of the heating fluid N. The cooling fluid R is 100 to 160 ° C. in this embodiment. The pressure (gauge pressure) at the supply port 21 of the cooling fluid R is, for example, about 0.4 to 0.6 MPa. As such a cooling fluid R, for example, hot water is suitable. The cooling fluid R in the main flow path 20 takes away the amount of heat from the first jacket J1 to the tire T by the heating fluid N. In this way, the amount of heat supplied is small in the portion of the tire T near the main flow path 20, so that the degree of vulcanization is small. The degree of vulcanization is the progress of vulcanization of rubber. For example, when rubber is held at a high temperature or for a long time, the degree of vulcanization increases. Further, for example, when the rubber is held at a low temperature or for a short time, the degree of vulcanization decreases. Further, for example, when the degree of vulcanization of even a part of the tire T is excessively large, the loss tangent (tan δ) is large and the rolling resistance performance tends to deteriorate. As described above, it is desirable that the degree of vulcanization of the tire T is uniform in each portion in order to enhance various performances of the tire T including rolling resistance performance.

The main flow path 20 extends in the tire circumferential direction, for example. As a result, the degree of vulcanization of the tire T can be suppressed in a large range over the tire circumferential direction.

In the reduced diameter state Y1, the center of the cross section of the main flow path 20 (the center of the cross section of the flow path) 20c is the width of the tread molding surface 15 of the sector mold 6 on both sides in the tire axial direction from the tire equatorial line C (tire). Axial distance) It is desirable that the tires are arranged within 20% of W1. As a result, for example, vulcanization of the center portion where the rubber thickness of the tread portion Ta is the smallest can be suppressed, and the entire area of the tread portion Ta from the center portion to both shoulder portions can have a uniform vulcanization degree. it can. In the reduced diameter state Y1, it is desirable that the cross-sectional center 20c of the main flow path 20 is located on the tire equator C in particular.

The maximum width Wa of the cross section of the main flow path 20 is preferably 10% to 30% of the width W1 of the tread molding surface 15 of the sector mold 6. As a result, the above-mentioned action is effectively exhibited. In the present embodiment, the cross section of the main flow path 20 has a maximum width Wa formed along the tire axial direction. In such an embodiment, the degree of vulcanization can be reduced in a wide range from the tire equator C to both sides in the tire axial direction. The cross section of the main flow path 20 may have a maximum width Wa formed along the radial direction of the tire.

In the present embodiment, the cross section of the main flow path 20 is formed in an elliptical shape. Such a main flow path 20 can suppress a decrease in rigidity of the sector mold 6 and suppress a degree of vulcanization in a preferable region of the tire T. Although not particularly limited, in order to improve the rolling resistance performance of the tire T for heavy load, the maximum width (length of the long side) Wa of the flow path cross section of the main flow path 20 and the length Wb of the short side are used. The ratio (Wb / Wa) is preferably about 0.2 to 0.5. The cross section of the main flow path 20 is not limited to such an embodiment, and may be, for example, rectangular, triangular, or circular.

The distance a from the main flow path 20 to the tread molding surface 15 of the sector mold 6 is preferably 10 to 30 mm. Similarly, the distance b from the main flow path 20 to the end face 6b of the sector mold 6 is preferably 10 to 30 mm. If the distance a or the distance b is less than 10 mm, the progress of vulcanization may be excessively suppressed, and the rigidity of the sector mold 6 may decrease. If the distance a or b exceeds 30 mm, the progress of vulcanization may not be effectively suppressed. The distance a or the distance b is the shortest distance from the main flow path 20.

FIG. 5 is a partial perspective view of the container 3, the sector mold 6, and the lower plate 8L. As shown in FIGS. 3 to 5, the heating suppressing means 4 of the present embodiment further includes a cooling fluid supply source 23, a first sub-channel 24, a second sub-channel 25, and a connecting pipe 26. .. The cooling fluid supply source 23 supplies the cooling fluid R. The cooling fluid supply source 23 is preferably, for example, a well-known hot water boiler or the like, but is not limited to such an embodiment.

The first sub-flow path 24 connects, for example, between the main flow path 20 and the supply port 21. The second sub-flow path 25 connects, for example, between the main flow path 20 and the discharge port 22. The supply port 21 and the discharge port 22 are provided on, for example, the outer surface 9a of the holder 9. In other words, the first sub-channel 24 and the second sub-channel 25 are arranged inside the sector mold 6 and the holder 9 in the present embodiment.

The first sub-channel 24 and the second sub-channel 25 extend linearly. In the present embodiment, the first sub-channel 24 and the second sub-channel 25 extend linearly without being significantly bent. Such a first sub-flow path 24 and a second sub-flow path 25 can smoothly supply the cooling fluid R to the main flow path 20 and effectively suppress the heating of the tire T. In the case where the first sub-flow path 24 extends linearly downward from the main flow path 20 along the tire axial direction, bends from the main flow path 20, and extends to the supply port 21 (not shown), the first sub-channel The auxiliary flow path 24 is arranged adjacent to the shoulder portion. In such an embodiment, vulcanization of the lower shoulder portion having a large rubber thickness is suppressed, a desired vulcanization degree cannot be obtained, and a uniform vulcanization degree may not be obtained.

In the present embodiment, the connecting pipe 26 connects the supply port 21 of one holder 9 and the discharge port 22 of the other holder 9 in the holders 9 adjacent to each other in the tire circumferential direction. In this way, the connecting pipe 26 is arranged on the outside of the holder 9. Then, in the present embodiment, in the reduced diameter state Y1, the supply port 21 and the discharge port 22 are arranged below the tire equator C. In other words, the connecting pipe 26 extending from the supply port 21 and the discharge port 22 is arranged below the tire equator C in the reduced diameter state Y1. Thereby, for example, as described later, the connecting pipe 26 can be arranged without making the device 1 have a complicated structure.

In the present embodiment, the supply port 21 and the discharge port 22 are arranged below the main flow path 20. As a result, as described above, the connecting pipe 26 can be arranged on the lower side of the actuator ring 10 in the reduced diameter state Y1.

The connecting pipe 26 is preferably formed with a large radius of curvature in order to reduce the resistance of the flow of the cooling fluid R, and requires a certain length. As such a connecting pipe 26, for example, a flexible hose having a well-known structure that has heat resistance and can be freely bent and deformed is preferably adopted.

Further, from the above viewpoint, it is desirable that the connecting pipe 26 extends from the supply port 21 and the discharge port 22 to the outside of the actuator ring 10. Therefore, it is desirable that a notch 27 for avoiding contact with the connecting pipe 26 is provided at the lower end of the actuator ring 10.

The notch portion 27 is provided so as to penetrate, for example, the inner side surface 10a and the outer side surface 10b of the actuator ring 10. Since the supply port 21 and the discharge port 22 are arranged below the tire equator C, the notch portion 27 can be provided without interfering with the first jacket J1. The connecting pipe 26 is also housed in the notch 27. As a result, the structure of the actuator ring 10 can be made simple without making it complicated. It should be noted that such a notch portion 27 can be easily provided in, for example, the existing device 1.

The number of connecting pipes 26 is the same as the number of holders 9 and sector molds 6, for example. Further, for example, a cooling fluid supply source 23 is interposed in one of the plurality of connecting pipes 26. In other words, the connecting pipe 26 includes one first connecting pipe 26A in which the cooling fluid supply source 23 is interposed, and a plurality of second connecting pipes 26B in which the cooling fluid supply source 23 is not interposed.

In the present embodiment, the first connecting pipe 26A is a first portion 28 connecting between the cooling fluid supply source 23 and the supply port 21, and a second portion connecting between the discharge port 22 and the cooling fluid supply source 23. It is formed including 29.

As a result, the cooling fluid R flows from the cooling fluid supply source 23 to the first portion 28, the supply port 21, the first sub-flow path 24, the main flow path 20, the second sub-flow path 25, and the discharge port 22. Obtain the heat of one sector mold 6. Further, the cooling fluid R then flows from the connecting pipe 26 to the supply port 21, the first sub-flow path 24, the main flow path 20, the second sub-flow path 25, and the discharge port 22 of the holder 9 adjacent in the tire circumferential direction. As a result, the heat of the sector mold 6 adjacent to the tire circumferential direction is acquired, and this flow is repeated. Finally, the cooling fluid R returns from the discharge port 22 through the second portion 29 to the cooling fluid supply source 23.

Although the particularly preferable embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments and can be modified into various embodiments.

To confirm the effect of the present invention, tires manufactured using the tire vulcanizers shown in FIGS. 1 to 5 were tested. The test method and common specifications of the sample tires are as follows. Further, the tire vulcanizer has the same specifications except for the heating suppressing means.
“Position (%) of the center of the cross section of the main flow path” in Table 1 means (distance in the tire axial direction between the equator of the tire and the center of the cross section of the flow path) / W1.
Tire size: 11R22.5
Heating fluid: 200 ° C, 2.1MPa (gauge pressure at the heating fluid source) steam

<Loss tangent>
Using a viscoelastic spectrometer VES manufactured by Iwamoto Seisakusho Co., Ltd., the loss tangent of the rubber (tread rubber) arranged at the center of the tread portion of each sample tire was measured. The measurement conditions are as follows. The result is displayed as an index with the value of Comparative Example 1 as 100. The smaller the numerical value, the smaller the rolling resistance and the better the evaluation.
Measurement temperature: 70 ° C
Frequency: 10Hz
Initial stretch strain: 10%
Dynamic strain amplitude: ± 2%

<Rolling resistance performance>
Using a rolling resistance tester, the rolling resistance when each test tire was run under the following conditions was measured. The result is displayed as an index with the value of Comparative Example 1 as 100. The smaller the value, the smaller the rolling resistance and the better the evaluation.
Rim: 7.50 x 22.5
Internal pressure: 720kPa
Drum diameter: 1.7m
Load: 25.01kN
Speed: 80km / h
The test results are shown in Table 1.

As a result of the test, it was confirmed that the tire of the example has excellent rolling resistance performance because the loss tangent is small.

1 Tire vulcanization device 2 Mold 3 Container 4 Vulcanization suppression means 6 Sector mold 9 Holder 9a Outer surface 13 Heating means 20 Main flow path 21 Supply port 22 Discharge port C Tire equator R Cooling fluid

Claims (11)

It is a tire vulcanizer
A mold having a plurality of sector molds arranged in the tire circumferential direction and upper and lower side molds,
A container having a heating means for heating the mold,
In addition, a heating suppressing means for suppressing heating to the center portion including the tire equator of the sector mold is included.
The container has a plurality of holders, each of which holds the sector mold.
The heating suppressing means are arranged in the sector mold, and has a main flow path through which the cooling fluid flows, a supply port for supplying the cooling fluid to the main flow path, and a discharge port for discharging the cooling fluid from the main flow path. Including and
A tire vulcanizer in which the supply port and the discharge port are arranged on the outer surface of the holder in the radial direction of the tire and below the equator of the tire. The tire vulcanizer according to claim 1, wherein the main flow path extends in the tire circumferential direction. The tire vulcanizer according to claim 2, wherein the supply port and the discharge port are arranged below the main flow path. The heating suppressing means includes a first sub-flow path connecting the main flow path and the supply port, and a second sub-flow path connecting the main flow path and the discharge port, and the first side flow. The tire vulcanizer according to any one of claims 1 to 3, wherein the road and the second sub-channel extend linearly, respectively. The heating suppressing means includes a plurality of connecting pipes that sequentially connect the supply port of one holder and the discharge port of the other holder in the holders adjacent to each other in the tire circumferential direction.
The tire vulcanizer according to any one of claims 1 to 4, wherein a cooling fluid supply source is interposed in one of the plurality of connecting pipes. The container includes an actuator ring that moves the sector mold radially through the holder by moving up and down.
The tire vulcanizer according to claim 5, wherein a notch portion for avoiding contact with the connecting pipe is provided at the lower end portion of the actuator ring. The center of the cross section of the main flow path is arranged on both sides of the tire equator in the tire axial direction within 20% of the width of the tread molding surface of the sector mold, according to any one of claims 1 to 6. The described tire vulcanizer. The temperature of the cooling fluid is 100 to 160 ° C.
The tire vulcanizer according to any one of claims 1 to 7, wherein the pressure of the cooling fluid at the supply port is 0.4 to 0.6 MPa. The tire vulcanizer according to any one of claims 1 to 8, wherein the maximum width of the flow path cross section of the main flow path is 10% to 30% of the width of the tread molding surface of the sector mold. The tire vulcanizer according to any one of claims 1 to 9, wherein the distance a from the main flow path to the tread molding surface of the sector mold is 10 to 30 mm. The tire vulcanizer according to any one of claims 1 to 10, wherein the distance b from the main flow path to the end face of the sector mold in the tire circumferential direction is 10 to 30 mm.

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