JP2002307442A - Tire vulcanizing mold and tire vulcanizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire vulcanizing mold for forming a cavity or tunnel, which extends in parallel to the center axis of a tire or in the direction near to the center axis of the tire, in the tread part of the tire. SOLUTION: The shaping pins 40A and 40B corresponding to the cavity extending into the tread part of the tire are attached to the side molds 10 and 20 moving in the axial direction of the tire with respect to a split mold l equipped with both side molds 10 and 20 and a plurality of segments 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Inside a tread portion of a tire,
The present invention relates to a tire vulcanizing mold that forms a cavity or a tunnel extending in a direction parallel to or close to a central axis of a tire.

[0002]

2. Description of the Related Art In vulcanizing a tire having a deep groove with no block chipping, a mold called a so-called split mold is generally widely used. FIG. 11 (a)
The split mold 90 is shown in a cross-sectional view in a closed state. In this mold, a plurality of segments 91 which are combined in the circumferential direction to form an inner peripheral surface corresponding to the entire width of the tread portion of the tire, a lower side mold 94 forming both side portions of the tire, and a top plate 95 A cavity is formed with the upper side mold 93 attached to the upper side mold. Each segment 91 slides on the sliding surface 98 with respect to the container ring 92 while the relative rotation in the circumferential direction is restricted by a dovetail groove (not shown).

FIG. 11B shows the split mold 90.
Is a cross-sectional view showing a state when it is opened. First, when the container ring 92 is raised, each segment 91 is in sliding contact with the container ring 92.
It spreads outward while sliding on the plate ring 96. Then, when it cannot be further slid by a stopper (not shown), the container is pulled up by the container ring 92.

FIG. 10 is a sectional view of a tire vulcanized by a mold according to the present invention. The tire 5 has a deep main groove 6 that opens radially outward with respect to the rotation axis of the tire 5 on the surface of the tread portion 9 that is in contact with the road surface. parallel,
Alternatively, a cave-shaped hidden groove 7 formed inside the tread portion of the tire is provided so as to extend in a direction almost parallel to the tire.

When such a tire is to be vulcanized by the above-described conventional split mold 90, the segment 91 makes the adjacent surfaces of the side molds 93 and 94 to a point on the sidewall outside the hidden groove 7. Since they are provided at the corresponding positions, as shown by the two-dot chain line in FIG.
A pin 99 having an outer surface corresponding to the above is provided in the segment 91 to constitute a mold. However, if such a provision is made, even if the tire can be vulcanized, the tire is taken out from the mold. When the mold is opened, as shown in FIG. 11 (b), first, since the segment 91 moves so as to intersect with the extending direction of the pin 99, it is clear that the tire or the pin is damaged. Such a tire cannot be vulcanized with the split mold 90.

On the other hand, if this is to be vulcanized by a two-piece mold having no divided segments, in the case of a hidden groove extending parallel to the center axis of the tire, the tire can be mounted without interfering with the pin 99. Although it can be removed, there is no segment that moves in the direction radiating from the center axis of the tire, so the main groove 7 of the tire and the mold interfere with each other, and the block near the main groove 7 of the tread portion is damaged. Different.

Therefore, in order to make such a tire,
The only method was to vulcanize the tire without the hidden groove 7 once using a mold without the pin 99, and then cut and manufacture the hidden groove.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a plurality of segments which move in a radial direction with respect to the center axis of the tire. It is an object of the present invention to provide a tire vulcanization mold capable of forming an elongated cavity or tunnel extending substantially parallel to or nearly parallel to the inside of a tread.

[0009]

Means for Solving the Problems The present invention has been made to achieve the above object, and its gist structure and operation will be described below.

[0010] The tire vulcanizing mold according to the first aspect of the present invention includes an elongated cavity extending in a direction parallel to or substantially parallel to the center axis of the tire, at least one of which is open to the tread surface. The tire has a plurality of segments that are radially movable adjacent to each other in the circumferential direction, from the axial inside of one shoulder of the tire to the axial inside of the other shoulder beyond the equatorial plane. A tread ring portion having a mold forming surface corresponding to the tread central portion extending to the tread central portion, and a region extending from both outer tread portions on the axially outer side of the tread central portion to the side wall portion adjacent thereto, respectively. A mold for vulcanizing a tire, comprising both side molds having a mold molding surface to be molded, wherein a mold pin forming an elongated cavity is attached to the side mold.

According to the tire vulcanizing mold, the segment which advances and retreats in the radial direction has a surface adjacent to the side mold corresponding to a point axially inside the shoulder of the tire, that is, a point on the equatorial plane side. It is not necessary to provide a mold pin corresponding to the elongated cavity that opens axially outward from the shoulder of the tire on the segment because the mold pin and the elongated cavity interfere when opening and closing the mold. There is no.

[0012] Also, parallel to the central axis of the tire, or
For the elongated cavity extending at an angle close to parallel, the corresponding molded pin was attached to the side mold displaced along the tire axial direction when the mold was opened. And, will be separated in the direction parallel or nearly parallel, by slightly deforming the tire that is an elastic body, without hindrance to the mold pin from the elongated cavity,
Can be pulled out.

According to a second aspect of the present invention, there is provided a tire vulcanizing mold having a mold pin corresponding to an elongated cavity disposed parallel to a center axis of the tire according to the first aspect. is there.

In the tire vulcanized by the mold, the elongated cavity is provided in parallel with the axis of the tire. Therefore, the mold pin attached to the side mold is separated from the tire straight along the longitudinal direction of the elongated cavity. Therefore, interference can be completely prevented and the tire can be taken out of the mold.

According to a third aspect of the present invention, there is provided a tire for vulcanizing a tire having an elongated cavity extending in a direction substantially parallel to a center axis of the tire and having at least one opening in the surface of the tread portion in the tread portion. On the other hand, a tread ring portion having a mold molding surface corresponding to a region extending from the tread portion to a part of both sidewall portions adjacent thereto, and a mold molding surface corresponding to the remaining both sidewall portions. A tire vulcanizing mold comprising each side mold having
A mold pin that forms an elongated cavity is mounted radially outward on the outer periphery of the mold surface of the side mold, and the tread ring portion is divided into two parts in the axial direction, upper and lower, and further divided into circumferential segments This segment is provided with a hole through which the molded pin penetrates and engages, and the segment is displaced with respect to the side mold on the adjacent side along the longitudinal direction of the molded pin engaged with each other. It is configured to be possible.

According to this tire vulcanizing mold, the adjacent surface of the segment and the side mold is provided at a position corresponding to a point on the side wall as in the related art, but the mold pin corresponding to the elongated cavity is provided. Since the is mounted on the side mold, similarly to the mold of the first aspect, by slightly deforming the elastic tire, the mold pin can be pulled out of the elongated cavity without any trouble.

Further, the segment is provided with a through-hole through which the molding pin is inserted in parallel with the longitudinal direction of the molding pin, and the segment can be displaced in parallel to the molding pin with respect to the side mold. There is no interference with the mold pins.

According to a fourth aspect of the present invention, there is provided the tire vulcanizing mold according to the third aspect, wherein the forward and backward displacement of the segment with respect to the side mold is parallel to the longitudinal direction of the mold pin provided on the side mold. It is guided by a sliding guide.

According to this mold, the segments are guided by the slide guides provided on the side mold and parallel to the longitudinal direction of the mold pins, and the segments are displaced relative to the side mold, so that the segments can be surely moved. In addition, interference of the segment with the mold pin can be prevented.

According to a fifth aspect of the present invention, there is provided the tire vulcanizing mold according to any one of the third to fourth aspects, in which, among the forward and backward displacements of the segments with respect to the side mold, displacements in directions away from each other are urged. The displacement in the approaching direction is driven by the closing of the mold against the biasing means.

According to this mold, the forward and backward displacement of the segment with respect to the side mold is driven by using the closing action of the mold and the urging means. Therefore, separate driving means such as a motor is not required. A simple mold can be provided in space and cost.

According to a sixth aspect of the present invention, there is provided a tire vulcanizing mold according to the fifth aspect, wherein the urging means is constituted by a spring.

In this mold, since the urging means is constituted by a spring, the segments can be displaced very easily.

According to a seventh aspect of the present invention, there is provided a tire vulcanizing mold according to any one of the first to sixth aspects, wherein the movable stroke of the forward and backward displacement of the segment is longer than the depth of the elongated cavity. It is.

In this mold, since the forward and backward displacement of the segment is made longer than the depth of the elongated cavity, the mold pin corresponding to the elongated cavity is completely removed from the elongated cavity, and then the outer diameter of the tire is reduced. Since the tire can be removed from the mold, interference between the pin with the mold and the tire can be prevented.

In the tire vulcanizing mold according to the present invention, the side mold includes a side mold body, a mold pin, and a mold pin. The pin mounting block is made of a casting in which a molded pin is cast, and is mounted on the side mold body.

According to this mold, since the molded pin is cast into the pin mounting block and assembled, the molded pin can be easily attached to the side mold body.

According to a ninth aspect of the present invention, there is provided a method of vulcanizing a tire using the mold according to any one of the first to second aspects. After releasing the engagement between the groove of the tire and the ridge of the segment, the upper and lower side molds and the tire are separated from each other, the tire is taken out, and then the raw tire to be vulcanized is placed in the lower side mold. The mold is set, the side molds are closed while the mold pins are biting into the green tire, the segments are moved radially inward to form cavities, and then vulcanization of the tire is started.

According to this vulcanization method, the vulcanized tire can be taken out of the die without interfering with the die, and when the green tire is set and the die is closed, the vulcanized tire is not closed. By inserting a mold pin into the vulcanized tread rubber, it is possible to obtain a rubber shape close to the product before vulcanization, so that shape defects due to insufficient rubber flow will not occur. Absent.

[0030] The method for vulcanizing a tire according to claim 10 comprises:
When vulcanizing a tire using the mold according to any one of claims 3 to 8, after vulcanization of the tire is completed, the groove of the tire tread portion engages with the ridge of the corresponding mold segment. As such, the segments are separated from the side molds on each adjacent side along the length of the mold pins with which they are engaged, and the mold pins disengage from the corresponding elongated cavities of the tire. After that, the outer diameter of the tire is reduced, the engagement between the groove of the tire and the ridge of the segment is released, the tire is removed from the mold, and the green tire to be vulcanized is then placed between the upper and lower side molds. After holding the mold in the space and closing the mold, the upper and lower segments abut each other,
Furthermore, the mold is closed, and the segments are made to approach the adjacent side mold along the longitudinal direction of the mold pin while the ridge of the segment is not cut into the tread portion of the raw tire, and the mold is completely Until the tire is closed, the molded pin is cut into the green tire, and then the vulcanization of the green tire is started.

According to this vulcanization method, the vulcanized tire can be taken out of the die without causing interference with the die, and when a green tire is set and the die is closed, the vulcanized tire is not closed. By inserting a mold pin into the vulcanized tread rubber, it is possible to obtain a rubber shape close to the product before vulcanization, so that shape defects due to insufficient rubber flow will not occur. Absent.

Further, in this vulcanization method, the adjacent surface of the segment and the side mold is provided at the position of the mold corresponding to a point outside the shoulder of the tread, so that the mark on the adjacent surface is
It does not appear on the tread surface of the tread, and is preferable in appearance and product performance.

The method for vulcanizing a tire according to claim 11 is
In the structure described in claim 10, when the segment is separated from the side mold along the longitudinal direction of the mold pin, by controlling the tire internal pressure or the axial interval between both beads, the groove of the tread portion and the segment The ridge is maintained in engagement.

When sequentially changing the outer diameter of the vulcanized tire according to the degree of opening of the mold, this vulcanization method controls the outer diameter of the tire by controlling the tire internal pressure or the axial distance between both beads. Therefore, this can be simply and effectively realized.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a tire vulcanizing mold according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view showing a tire vulcanizing mold 1 in a closed state. As shown in FIG. 1, in this mold 1, a fixed annular lower side mold 10 descends, closes the mold 1, rises to open the mold 1, and allows the tire to be taken out. To do, annular upper side mold 2
0, the cavity 8 is formed by the plurality of segments 30 movable in the radial direction and the pins 40A and 40B with the mold.

The plurality of segments 30 are circumferentially combined to form an annular shape, and the center of a tread extending from the axial inside of one shoulder of the tire to the axial inside of the other shoulder beyond the equatorial plane. An annular tread ring portion having a mold molding surface corresponding to the portion is formed. One segment 30 is composed of a plurality of mold elements 31 forming a pattern of a tread portion, and an element holder 32 accommodating the mold elements 31 collectively. A plurality of segments 30 that are annularly adjacent to each other in the circumferential direction are
The dovetail groove (not shown) slides on the container ring 35 and can move along the inward tapered surface of the container ring 35. The number of segments is not particularly limited.

On the other hand, both side molds have a mold molding surface corresponding to each of the regions extending from both outer portions of the tread to the entire region of the sidewall portion adjacent thereto.

FIG. 10 shows an example of a tire to be vulcanized by the vulcanizing mold 1. As described above, this tire has a deep main groove 6 that opens radially outward with respect to the rotation axis of the tire 5 on the surface of the tread portion 9 that is in contact with the road surface, and a plane that includes the center axis of the tire. Cave-shaped hidden groove 7 extending substantially parallel to this central axis and forming an elongated cavity
Are formed in the tread portion. In this example, the hidden grooves are arranged circumferentially at equal intervals, but there is no particular limitation on the number and arrangement of the elongated cavities, and their orientations and positions are also arranged symmetrically with respect to the tire equatorial plane. It does not need to be done. Also,
FIG. 2 shows a cave-shaped hidden groove 7 opened at the end of the tread portion. However, the mold can be applied to a tunnel-shaped hollow portion penetrating to the main groove 6. it can.

FIG. 1 shows a state in which the tire 5 shown in FIG. 10 has been vulcanized. The lower mold pin 40A and the upper mold pin 40 respectively engage with the left and right hidden grooves 7 of the tire 5. 40B, the number of side molds 1 is the same as the number of hidden grooves.
0 and 20.

The segment 30 and the side molds 10, 2
The mating surfaces 12 and 22 of 0 are usually provided axially outside the shoulder of the tire, whereas in the present embodiment, they are provided axially inside the shoulder of the tire, that is, on the equatorial plane side. As a result, the mold pin is not disposed on the segment, so that the segment does not interfere with the tire when the segment is displaced in the radial direction.

In FIG. 1, the mold pins 40A and 40B are formed by being cast into cast pin mounting blocks 41A and 41B, respectively, and the pin mounting blocks 41A and 41B are formed.
Are fixedly attached to the side molds 10 and 20.

FIG. 2 is a sectional view showing a state where the mold 1 is being opened. FIG. 2 shows that, after the state shown in FIG.
Are moved outward in the radial direction, and then the upper side mold 20 is started to move upward. In the figure, the mold pins 40A, 40B are disposed so that their longitudinal direction is parallel to the center axis of the mold, that is, the direction in which the side mold is displaced. Can be extracted without interference.

However, even when the mold pins 40A and 40B are provided slightly inclined with respect to the direction of the axis of the tire, the positions of the hidden grooves 7 in the radial direction, That is, by continuously changing the outer diameter of the tire by a method such as controlling the internal pressure applied to the tire, the molded pins 40A and 40B can be extracted from the hidden groove 7 without difficulty.

Following FIG. 2, the vulcanized tire 5 is taken out of the die 1, and the die 1 in a state where the raw tire 5A to be vulcanized is set in the die is shown in a sectional view in FIG. . The raw tire 5A is set by biting into the molded pins 40A of the lower side mold 10. However, following the state shown in FIG. 3, when the upper side mold 20 is lowered, the upper and lower molded pins 40A, 40B become It penetrates deep into the tread. When the upper and lower side molds 10 and 20 approach the interval corresponding to the tire cavity, the segment 3
0 is displaced inward in the radial direction so that the ridges 34 provided on the segments bite into the tread portion, the mold 1 is completely closed, and the tire can be vulcanized.

FIG. 4 shows a second embodiment of the mold according to the present invention.
This will be described with reference to FIG. As shown in FIG. 4, the vulcanizing mold 51 includes a lower segment 80A, an upper segment 80B, a lower side mold 60, and an upper side mold 70 which are combined in the circumferential direction to form an annular shape.

The segments 80A, 80B are combined vertically and circumferentially to form a tread having a mold forming surface corresponding to the tire outer surface in a region including a tread portion of the tire and a part of a sidewall portion adjacent to both sides of the tread portion. Form a ring.

On the other hand, each side mold 60, 7
No. 0 has a mold molding surface corresponding to the remaining side wall portion, and has mold pins 90A, 90B corresponding to the hidden grooves 7 of the tire mounted radially outside the molding surface.

The lower segment 80A has a molded pin 90A.
The hole 84 is formed in parallel with the longitudinal direction of the mold pin 90A.

Further, the guide pin 8 provided in the lower side mold 60 is inserted into the guide hole 85 provided in the lower segment 80A.
6 slides and guides the displacement of the segment 80A. Since the guide hole 85 and the guide pin 86 are provided in parallel to the longitudinal direction of the mold pin 90A that engages with the segment 80A, the lower segment 80A Can be displaced along the direction.

Further, the guide hole 85 of the lower segment 80A is provided.
The coil spring 87 is housed in a space formed between the coil spring 87 and the tip of the guide pin 86. The coil spring 87 extends to drive the segment 80A in a direction away from the lower side mold 60. When the mold is closed, when the lower segment 80A approaches the side mold 60 against the repulsive force of the coil spring 87, It contracts and stores the energy of elongation.

Although the relationship between the lower side mold 60 and the lower segment 80A has been described above, the relationship between the upper side mold 70 and the upper segment 80B is completely the same, and a description thereof will be omitted.

FIG. 5 is a sectional view of the mold showing a state where the mold is opened following the state of FIG. The upper side mold 70 rises and moves away from the lower side mold 60, but the upper and lower segments 80A and 80B are guided by the guide pins 86 while being in contact with each other by the action of the coil spring 87, and are respectively Along the longitudinal direction of the molded pins 90A, 90B that penetrate and engage, they are separated from the side molds 60, 70 on the adjacent sides, respectively. At this time, since the through hole 83 is parallel to the longitudinal direction of the mold pin 90A,
There is no interference between the mold pins 90A, 90B and the segments 80A, 80B.

In order to separate the tire 5 from the mold pins 90A, 90B provided on the side molds 60, 70 while the hidden groove 7 is engaged with the mold pins 90A, 90B of the mold, the tire 5 is hidden. When the groove 7 is inclined with respect to the central axis of the tire, it is necessary to gradually increase the outer diameter of the tire to prevent the interference between the hidden groove 7 and the pins 90A and 90B. For this reason, in the present embodiment, the bead width or the internal pressure is adjusted so as to always control to prevent interference. And, by this, the ridge 8 of the segment
The engagement between the main groove 4 and the main groove 6 of the tire 5 is maintained.

FIG. 6 shows the state after the upper side mold 70 is further lifted and the pins 90A and 90B with the mold have disengaged from the hidden groove 7 of the tire. When the engagement is released,
Even if the outer diameter portion of the tire is contracted radially inward, there is no interference portion, so that the internal pressure and the bead width can be returned to the normal state. Then, in response to this movement, the engagement between the main groove 6 of the tire and the ridge 84 of the segment can be released.
The tire 5 can be removed from the mold 51 without interference.

FIG. 7 is a cross-sectional view of the mold 51 in a state where the vulcanized tire 5 is removed from the mold 51, and then the green tire 5A to be vulcanized is set in the mold 51. The raw tire 5A is held at the position shown in FIG. 7 by a gripping means (not shown), the upper side mold 70 is lowered, and the mold 51 is closed. Then, as shown in FIG. And the upper segment 80B come into contact with each other, and the ridges 84 of the segments 80A and 80B start to bite into the raw tire 5A almost at the same time. At this point, the pin 9
The tips of 0A and 90B are still outside the shoulder of the raw tire 5A. From this state, the upper side mold 70
Is lowered, the upper and lower segments 80A, 80B
Approach the side molds 60 and 70 on the adjacent sides, and at the same time, the ridges 84 of the segments 80A and 80B.
Dig deep into the tread portion of the raw tire 5A that has been sufficiently preheated and softened. And the pin 90A with a mold,
90B also diagonally bites into the raw tire 5A, and since the tread rubber is soft, it can easily wrap around the pins 90A and 90B and fill the space around the pins.

Then, both side molds 60 and 70 and upper and lower segments 80A and 80B approach each other,
FIG. 9 is a cross-sectional view of the mold 51 in a state where the mold 51 is completely closed. Thereafter, vulcanization is started, and after completion of vulcanization, the state returns to the state shown in FIG. According to such a tire vulcanizing method, the tire 5 having the hidden groove 7 can be vulcanized using the mold 51.

[0057]

As is apparent from the above description,
According to the present invention, by including a mold pin attached to the side mold, parallel to the center axis of the tire, or
A mold for forming an elongated cavity extending in a direction substantially parallel to the tread portion and a vulcanization method for vulcanizing a tire using the mold can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a tire vulcanizing mold according to the present invention.

FIG. 2 is a sectional view of the mold showing a state following FIG. 1;

FIG. 3 is a sectional view of the mold showing a state following FIG. 2;

FIG. 4 is a sectional view showing a second embodiment of a tire vulcanizing mold according to the present invention.

FIG. 5 is a sectional view of the mold showing a state following FIG. 4;

FIG. 6 is a sectional view of the mold showing a state following FIG. 5;

FIG. 7 is a sectional view of the mold showing a state following FIG. 6;

FIG. 8 is a sectional view of the mold showing a state following FIG. 7;

FIG. 9 is a sectional view of the mold showing a state following FIG. 8;

FIG. 10 is a cross-sectional view showing an example of a tire vulcanized by the mold according to the present invention.

FIG. 11 is a sectional view showing a conventional tire vulcanizing mold.

[Explanation of symbols]

 Reference Signs List 1, 51 Tire vulcanizing mold 5 Tire 5A Raw tire 6 Main groove 7 Hidden groove 8 Cavity 9 Tread section 10 Lower side mold 20 Upper side mold 30, 80A, 80B segment 31 Mold element 32 Element holder 34, 84 segment Projection 35 Container ring 40A, 40B, 90A, 90B Pins 41A, 41B Pin mounting block 83 Through hole 85 Guide hole 86 Guide pin 87 Coil spring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 AA45 AH20 CA21 CB01 CU02 CU03 CU14 CU20 4F203 AA45 AH20 DA11 DB01 DC01 DL10

Claims (11)

[Claims] 1. A tire having an elongated cavity in a tread portion extending in a direction parallel to or substantially parallel to a center axis of the tire and having at least one opening in a surface of the tread portion, the tire being circumferentially adjacent to each other. A mold corresponding to a tread central portion extending from an axially inner side of one shoulder of the tire to an axially inner side of the other shoulder from an axially inside of one shoulder of the tire. A tread ring portion having a molding surface, and both side molds having a mold molding surface corresponding to a region extending from both outer tread portions on the outside in the axial direction of the tread central portion to a sidewall portion adjacent thereto. A tire vulcanizing mold, comprising a mold pin forming an elongated cavity attached to a side mold. 2. The tire vulcanizing mold according to claim 1, further comprising a mold pin corresponding to the elongated cavity disposed parallel to the center axis of the tire. 3. A tire having an elongated cavity in a tread portion extending in a direction substantially parallel to a central axis of the tire and having at least one opening in a surface of the tread portion, wherein both sides adjacent to the tread portion are provided. A tire vulcanizing mold comprising a tread ring portion having a mold forming surface corresponding to a region extending to a part of the wall portion and respective side molds having mold forming surfaces corresponding to the remaining sidewall portions. A mold with a mold pin forming an elongated cavity is mounted radially outward on the outer periphery of the mold surface of the side mold, and the tread ring portion is divided into upper and lower parts in the axial direction. The segment is provided with a hole through which the molded pin is engaged, and the segment is formed along the longitudinal direction of the molded pin to be engaged. And a tire vulcanization mold configured to be capable of moving forward and backward with respect to the side molds on the adjacent sides. 4. The tire vulcanizing mold according to claim 3, wherein the forward / backward displacement of the segment with respect to the side mold is guided by a sliding guide provided on the side mold and parallel to the longitudinal direction of the mold pin. 5. Among the forward and backward displacements of the segments with respect to the side mold, the displacement in the direction away from each other is driven by the biasing means, and the displacement in the approaching direction is resisted by the biasing means by closing the mold. The tire vulcanizing mold according to any one of claims 3 to 4, which is driven. 6. The tire vulcanizing mold according to claim 5, wherein the urging means is constituted by a spring. 7. The tire vulcanizing mold according to claim 1, wherein the movable stroke of the forward / backward displacement of the segment is longer than the depth of the elongated cavity. 8. The side mold includes a side mold body, a molded pin, and a pin mounting block for mounting the molded pin, and the pin mounting block is formed of a casting into which the molded pin is cast. The tire vulcanizing mold according to any one of claims 1 to 7, which is attached to a side mold body. 9. When vulcanizing a tire using the mold according to claim 1, after vulcanization of the tire is completed,
After displacing the segment radially outward to disengage the tire groove from the segment ridge, the upper and lower side molds and the tire are separated from each other, the tire is taken out, and then the raw tire to be vulcanized Is set in the lower side mold and both side molds are closed while the mold pin bites into the raw tire, and then the segments are moved radially inward to form the cavity, and then the tire vulcanization is started. Tire vulcanization method. 10. When vulcanizing a tire using the mold according to any one of claims 3 to 8, after completion of vulcanization of the tire, grooves of the tire tread portion and segments of the corresponding mold are formed. With the ridges engaged, the segments are separated from the side molds on each adjacent side along the length of the mold pins with which they are engaged, and the mold pins are brought into contact with the corresponding elongated cavities of the tire. After the disengagement of the tire, the outer diameter of the tire is reduced, the engagement between the groove of the tire and the ridge of the segment is released, the tire is removed from the mold, and then the raw tire to be vulcanized is Hold the mold in the space between the upper and lower side molds and close the mold.After the upper and lower segments abut each other, close the mold further and do not let the ridge of the segment bite into the tread part of the raw tire. While pinning the segment Along the longitudinal direction, approach the side mold on the adjacent side, bite the mold pin into the raw tire until the mold is completely closed, and then start vulcanizing the raw tire. Vulcanization method. 11. When the segment is separated from the side mold along the longitudinal direction of the molding pin, the groove of the tread portion and the ridge of the segment are engaged by controlling the tire internal pressure or the axial interval between both beads. The method for vulcanizing a tire according to claim 10, wherein the combination is maintained.