JP2001269936A - Device for holding attitude of bladder for tire vulcanizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the shaping attitude of a bladder correctly in accordance with many kinds of tire sizes. SOLUTION: When the opening end (2a) of the bladder is fitted to the outer surcumference (1a) of the upper end opening on the bag well (1) for housing the bladder and the green tire (G) set in the molding (3a) is shaped, in the tire vulcanizer that the bladder (2) projecting from the inside of the bag-well (1) gets into contact with the inside of green tire (G) in turn from the lower bead part (Bd) to the upper bead part (Bu), a holding ring 11 is detachably attached to provided with an outward flange-shaped bladder basepressing part 14 at the upper side the upper end of the bag well (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bladder attitude holding device for a tire vulcanizer used for vulcanizing green tires.

[0002]

2. Description of the Related Art As shown in FIGS. 6 to 8, a vulcanizer of this kind is provided with a bag well 1 for accommodating a bladder 2, and a bladder 2 is provided on an outer peripheral portion 1a of an upper end opening of the bag well 1.
When shaping a green tire G (see FIG. 6A) set sideways in the vulcanizing molds 3a, 3b, the bladder coming out of the bag well 1 is fitted. 2 sequentially contacts the inner surface of the green tire G from the lower bead portion Bd to the upper bead portion Bu (see FIG. 6B), and the upper and lower vulcanizing dies 3a and 3b are closed (FIG. 7 ( a) When shaping is performed and vulcanization is completed, the bladder 2 comes out of the vulcanized tire T and is housed in the bag well 1, and the upper vulcanization mold 3a is opened (FIG. 7 (b)). ), And a mushroom type in which the tire T is taken out by an unloader (not shown).

Conventionally, a 12-inch tire size has been standardized as a bag well 1 for molding general tires for passenger cars, and is used without replacement even if the tire size increases.

[0004]

In the above-mentioned prior art, the mold 3 and the bladder 2 are replaced for each tire size. However, as described above, since the bag well 1 is not replaced, the tire size is increased. Then, as shown in FIG. 8, the distance between the outer periphery of the upper end of the bag well 1 and the diameter D of the bead ring 4 becomes large, and it becomes difficult to control the shaping attitude of the bladder 2 and a defective tire is generated. . The present invention has been made in view of the above situation, and an object thereof is to provide a bladder posture holding device for a tire vulcanizer capable of appropriately controlling the shaping posture of a bladder according to various tire sizes. To offer.

[0005]

According to the present invention, the following technical measures are taken to achieve the above object. That is, the bladder attitude holding device of the tire vulcanizer according to the present invention, when the bladder opening is fitted to the outer periphery of the upper end opening of the bag well that stores the bladder, when shaping the green tire set in the mold. In a tire vulcanizing machine in which a bladder coming out of the inside of a bag well sequentially contacts an inner surface of a green tire from a lower bead portion toward an upper bead portion, the bladder is disposed on an upper end portion of the bag well and an upper end portion. It is characterized in that a holding ring provided with a bladder base pressing portion in the form of a facing flange is detachably mounted.

In this case, the retaining ring is used when a tire other than the standard tire size is molded. The retaining ring is manufactured and prepared in advance for each tire size, and is simultaneously prepared with the vulcanizing mold and the bladder. Replaced and installed. When the tire is shaped, the base of the bladder is pressed against the bead ring of the lower vulcanization mold from above to hold the bladder, so that the base of the bladder is stabilized and its posture control becomes very easy. Therefore, it is possible to prevent the occurrence of defective products due to the control of the bladder attitude of the tire to be molded.

Further, the bladder posture holding device for a tire vulcanizer according to the present invention is characterized in that the holding ring is constituted by a plurality of divided members divided in a radial direction. According to this configuration, when the inner diameter of the bladder opening is difficult to expand or contract, or when the outer diameter of the bladder base pressing portion of the holding ring is larger than the inner diameter of the bladder opening, the retaining ring is moved from the bladder opening to the outside. After being inserted therein, the bladder can be fitted into the upper opening of the bagwell, and then the bladder can be attached to the bagwell. Further, the bladder attitude holding device for a tire vulcanizer according to the present invention may be configured such that the divided bodies of the holding ring are detachably connected and integrated via a connecting member. The divided bodies are connected and integrated after being inserted into the bladder.

[0008] In this case, the connecting member may be a ring that is removably attachable to the bag well opening, or a connecting plate that is applied only to a divided portion of the holding ring. It can be connected and integrated by a plurality of fasteners such as bolts and screws. According to this configuration, the holding ring can be securely fitted to the bag well, and the bladder base can be held more stably and uniformly. Further, the posture holding device for a tire vulcanizer according to the present invention is characterized in that a vulcanizing medium flow hole is provided in the bladder base pressing portion. in this case,
The vulcanizing medium can be sufficiently circulated also between the inner surface of the bag well base and the lower surface of the holding portion of the holding ring, so that tire shaping can be performed uniformly and accurately.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of a bladder posture holding device 10 for a tire vulcanizer according to the present invention. The bladder attitude holding device 10 is detachably fitted to the bag well 1 of a conventional tire vulcanizer. The tire vulcanizer itself is exactly the same as that shown in FIGS. 6 and 7
This will be described with reference to FIG.

As shown in FIGS. 1 and 2, the bladder attitude holding device 10 includes a holding ring 11 and a ring which is fitted on the ring 11 and is removably fitted into an upper end opening of the bag well 1. It is composed of a connection member 12 and a screw 13 for detachably connecting the connection member 12 and the ring 11. As shown in FIG. 2, the retaining ring 11 is divided into two (divided into two in the radial direction), and is provided on the upper side of each of the cylindrical portions of the ring divided bodies 11a and 11b.
An outward flange-shaped bladder base pressing portion 14 is provided in contact with an upper edge 1b of the upper end of the bag well 1, and a vulcanizing medium flow hole 15 parallel to the axis of the holding ring 11 is provided in the pressing portion 14. A plurality is provided.

A plurality of insertion holes 16 for screws 13 penetrating in the radial direction are provided in the cylindrical portions of the ring divided bodies 11a and 11b. The screw hole 17 of the screw 13 is provided in the connecting member 14 with the divided bodies 11a, 1a.
1b is provided corresponding to the insertion hole 16. The outer diameter d of the bladder base pressing portion 14 is appropriately determined according to the outer diameter D of the bead ring 4 of the vulcanizing molds 3a and 3b for each tire size. That is, the holding portion 14
Is slightly smaller than the outer diameter D of the bead ring 4 so that the bead portion Bd of the green tire G can be sufficiently and reliably formed with high accuracy when shaping the green tire G. .

The number of the vulcanizing medium flow holes 15 can be arbitrarily selected, but may be omitted in some cases. In the present embodiment, the holding ring 11 is used for vulcanization molding of a tire size other than the minimum diameter standard, but the outer diameter d of the bladder base pressing portion 14 is different for each tire size except the minimum diameter. Different ring segment 1
1a and 11b, respectively, and the connecting member 12 is
One can be diverted. The connecting member 12
Can be fixed to the inner surface of the cylindrical portion of each of the ring divided bodies 11a and 11b.

According to the first embodiment, when the holding ring 11 is fitted to the bag well 1, first, the bladder 2 and the ring divided bodies 11a and 11 corresponding to the tire size.
b, the ring divided bodies 11a and 11b are put into the bladder 2, and the cylindrical part of the ring divided bodies 11a and 11b, that is, the part where the connecting member 12 is fitted to the outside of the bladder 2 is opened from the bladder opening end 2a. Then, the connecting member 12 is externally fitted to the cylindrical portions of the ring divided bodies 11a and 11b, and the ring divided body 11
a and 11b are connected and integrated with the connecting member 12 by screws 13.

After the holding ring 11 assembled in the bladder 2 is fitted with the bladder opening end 2a on the outer peripheral portion 1a of the upper end of the bag well 1, the connecting member 12 is fitted in the bladder 2. Is fitted to the upper end opening of the bag well 1 so that the holding portion 14
Presses and holds the bladder base against the upper surface of the bead ring 4 of the lower vulcanizing mold 3b. Therefore, as shown in FIG. 3, the base of the bladder 2 has a considerable gap between the upper end opening of the bag well 1 and the bead Bd of the green tire G during the shaping operation of the green tire G. However, the bladder 2 is pressed down by the bladder pressing portion 14 and is stably held. The bladder 2 is properly inserted into the green tire G with a vulcanizing medium in a good posture, and shaping is performed uniformly and accurately. For this reason, it is possible to prevent the occurrence of tires having poor shaving.

FIG. 4 shows a second embodiment of the bladder posture holding device 10 for a tire vulcanizer according to the present invention. The difference from the first embodiment is that the connecting member 12 has a curved plate shape, This is a point in which the inner surfaces of the cylindrical portions of the divided bodies 11a and 11b are applied so as to straddle both the divided bodies 11a and 11b and fastened with screws 13 to be integrated, and the same operational effects as those of the first embodiment can be expected. it can. Therefore, components common to the first embodiment are denoted by the same reference numerals as in FIGS.
Detailed description is omitted. FIG. 5 shows a third embodiment of the bladder posture holding device 10 for a tire vulcanizer according to the present invention.

The difference between the third embodiment and the second embodiment is that the connecting member 12 is formed in a flat plate shape, and the two ring divided bodies 11a, 11a, 11b are provided on the upper surface of the bladder pressing portion 14 of the ring divided bodies 11a, 11b. This is a point that the bolts 13 are fixed to and integrated with the screws 13 so as to straddle the portion 11b, and have substantially the same operation and effect as the second embodiment. Therefore, the same components as those in the second embodiment are denoted by the same reference numerals as in FIG. 4 and the detailed description is omitted. In each of the above embodiments, the number of screws 13 for fastening the connecting member 12 and the vulcanizing medium flow holes 1
The number of 5 can be appropriately increased or decreased.

The present invention is not limited to the above-described embodiment. For example, the holding ring 11 can be divided into three or four parts, or can be integrated without dividing. An appropriate design change may be made, for example, by adopting a configuration in which an annular groove capable of fitting the cylindrical portion of the holding ring 11 or the ring divided bodies 11a and 11b is provided in the upper end opening of the bag well 1 so that the connecting member 12 is unnecessary. It is possible.

[0018]

As described above, in the bladder attitude holding device according to the present invention, the bladder opening is fitted to the outer periphery of the upper end opening of the bag well accommodating the bladder, and the green tire set in the mold is shaped. In doing so, the bladder coming out of the bag well, in a tire vulcanizer so as to sequentially contact the inner surface of the green tire from the lower bead portion to the upper bead portion, at the upper end of the bag well, Since the holding ring with the outward flange-shaped bladder base holding part on the upper side is detachably mounted,
By preparing the holding ring for each tire size and appropriately replacing and using the holding ring, it is possible to appropriately control the shaping attitude of the bladder according to various tire sizes, and to prevent the occurrence of poorly formed tires. .

[Brief description of the drawings]

FIG. 1 is a front view of a central longitudinal section showing a first embodiment of the present invention.

FIG. 2 is a plan view of a holding ring according to the embodiment.

FIG. 3 is a front view of the central longitudinal section for explaining the operation in the embodiment.

FIG. 4 is a central longitudinal sectional view showing a retaining ring which is a main part of a second embodiment of the present invention.

FIG. 5 is a plan view showing a retaining ring which is a main part of a third embodiment of the present invention.

FIGS. 6 (a) and (b) are explanatory diagrams of the operation of the tire vulcanizer.

FIGS. 7A and 7B are explanatory diagrams of the operation of the tire vulcanizer.

FIG. 8 is a central longitudinal sectional view for explaining a bladder posture during conventional tire shaving.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bag well 1a upper end opening outer peripheral portion 2 bladder 2a bladder opening end portion 3a upper vulcanizing mold 3b lower vulcanizing mold 10 bladder attitude holding device 11 holding ring 11a ring split body 11b ring split body 12 connecting member 14 bladder pressing section 15 Vulcanizing medium flow hole G Green tire Bd Lower bead Bu Upper bead

Claims (4)

[Claims] A bladder opening is fitted to an outer peripheral portion of an upper end opening of a bag well for accommodating a bladder, and when shaping a green tire set in a mold, a bladder coming out of the bag well is replaced with a green tire. In a tire vulcanizer in which an inner surface is sequentially contacted from a lower bead portion to an upper bead portion, the tire vulcanizer is provided with an outer flange-shaped bladder base pressing portion on an upper side at an upper end of the bag well. A bladder attitude holding device for a tire vulcanizer, wherein a ring is detachably mounted. 2. The bladder attitude holding device for a tire vulcanizer according to claim 1, wherein the holding ring is constituted by a plurality of divided bodies divided in a radial direction. 3. The posture holding device for a tire vulcanizer according to claim 2, wherein the divided members of the holding ring are detachably connected and integrated via a connecting member. 4. A bladder attitude holding device for a tire vulcanizer according to claim 1, wherein a vulcanizing medium flow hole is provided in the bladder base pressing portion.