JP5545633B2 - Tire molding drum sealing device molding device, sealing member manufacturing device, sealing member manufacturing method, tire molding drum, and sealing member - Google Patents

Description

The present invention relates to a molding device for a sealing member for a tire molding drum, a manufacturing device for the sealing member, a manufacturing method for the sealing member, a tire molding drum, and a sealing member .

2. Description of the Related Art Conventionally, a tire molding apparatus is known that forms a raw tire by supplying air into a tire component wound around a tire molding drum and deforming it into a toroidal shape (see Patent Document 1).
FIG. 3 is a cross-sectional view showing the left half of an example of a conventional tire forming drum. The tire forming drum 21 has a horizontal cylindrical drum main shaft 22 connected to a drive unit (not shown) of a tire forming apparatus as shown in the figure. An annular sliding body 35 having a plurality of folding fingers 67 with rollers 69 for folding the tire constituent member K around the bead B with filler is fitted on the drum main shaft 22.
A nut 28 is fixed to the sliding body 35 via a connecting block 30, and the nut 28 is screwed to the male screw 24 of the screw shaft 23 in the drum main shaft 22.
Therefore, when the tire constituent member K is deformed in a toroidal shape by air, the screw shaft 23 is rotated in accordance with the deformation, and the sliding body 35 can be slid toward the center of the drum.

A bead lock segment 44 is disposed at the center side end portion of the tire molding drum 21 of the sliding body 35 so as to be freely expandable and contractable in the radial direction, and the base end portion 58 a of the outer peripheral surface of the bead lock segment 44 is formed on the sliding body 35. The seal member 58 is kept airtightly covered with an extending portion 58c (outside as viewed from the center of the tire molding drum).
Here, the seal member 58 is made of rubberized cord cloth, and as shown in the drawing, a cylindrical inner side (center side of the tire forming drum) extending portion 58b extends from the radially outer end of the base end portion 58a. A cylindrical outer extending portion 58c extends continuously from the inner end in the axial direction of the inner extending portion 58b.

When the tire constituent member K is deformed into a toroidal shape by air, the seal member 58 is brought into close contact with the radially inner side of the tire constituent member K by the bead lock segment 44 whose diameter is increased. It acts to seal between the tire constituent members K.
The outer peripheral surface of the seal member 58 is subjected to an adhesion prevention process for preventing adhesion with the tire constituent member K, for example, application of liquid silicon and roughening.

  By the way, when the bead lock segment 44 moves outward in the radial direction, the tip end portion of the outer extension portion 58c of the seal member 58 expands, and the inner and outer extension portions 58b and 58c are formed as shown in FIG. Then, it deforms so as to open in a V-shaped cross section. In particular, the outer end side of the outer extending portion 58c is forcibly deformed in the shape of a concave groove formed on the peripheral surface of the bead lock segment 44 during sealing, so that the bead lock segment 44 expands and contracts in the radial direction. As the number of times of use increases, the distal end portion of the outer extending portion 58c is deformed into a shape that is enlarged in the radial direction.

When the above-described deformation of the distal end of the outer extending portion 58c of the seal member 58 proceeds, as shown in FIG. 5, when the tire constituent member (band) K is inserted into the tire drum, the axial direction of the tire constituent member K is eventually reached. As a result of the inner end portion (tip portion in the insertion direction) hitting the outer end of the outer extending portion 58c of the seal member 58 and obstructing the insertion, the tire constituent member K cannot be correctly attached to the tire molding drum 21, and therefore the tire constituent member K may be misaligned or may fall if significant.
When such a situation occurs, conventionally, emergency measures such as cutting an enlarged portion of the outer extending portion 58c of the seal member 58 with a cutter have been taken, but the tire component member K becomes a defective product, Since work for emergency measures is required, troubles such as a decrease in productivity are inevitable, and there is a need for a solution.

JP 2001-293793 A

The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a tire component member (band) to a tire molding drum even if the deformation occurs at the tip of the outer extending portion of the seal member. ), A sealing member molding apparatus, a sealing member manufacturing apparatus, a sealing member manufacturing method, a tire molding drum, and a sealing member .

(1) A first invention is a molding apparatus for a seal member that seals between a bead lock segment and a tire constituent member in a tire forming drum having a bead lock segment that presses the tire constituent member against a bead, an annular sealing member for a mold wrapping the vulcanization sealing member, the sealing member for the mold when the sheet seal member is disposed between the bead lock segments and the tire structure member, deformed by radial scaling of the bead lock segments wherein the be a molding apparatus of the seal member, characterized in that the end portion of the unvulcanized sealing member has a small-diameter portion you reduced-diameter type.
(2) the second invention, in the molding apparatus of the seal member described before Symbol (1), the small-diameter portion, an end portion of the molding surface from a predetermined position of the annular molding surface of the sealing member for the mold The sealing member molding apparatus is characterized in that it is formed in a shape that continuously decreases in diameter along a single arc.
(3) a third invention, in the molding apparatus of the seal member described in the previous SL (2), the sealing member for a mold is made from the outer ring and the inner ring, the unvulcanized sealing member the outer ring The base end is sandwiched between the inner ring and the predetermined position is a position for molding a portion to be arranged on the inner end of the bead lock segment of the seal member to be molded. It is a molding device of a seal member.
(4) According to a fourth invention, in the molding apparatus of the seal member described in the previous SL (2) or (3), the outer ring, the positioning ring for defining the width of said sealing member is provided It is the shaping | molding apparatus of the sealing member characterized by the above-mentioned.
(5) A fifth aspect of the invention is the molding device prior to SL (1) to (4) sealing member according to any one of the further apparatus for manufacturing a seal member comprising the vulcanizing apparatus It is.
(6) A sixth invention is a manufacturing method of the sealing member the tire component member Te tire building drum odor having a bead lock segments pressed against the bead to seal between bicycloalkyl over de lock segments and the tire component member, one end put come winding an unvulcanized sealing member around the sealing member for a mold having a small diameter portion, when the seal member is disposed between the bead lock segments and the tire structure member, deformed by radial scaling of the bead lock segments production of the sealing member, characterized the step of molding the reduced diameter section on the end side of the unvulcanized sealing member that would be a step of vulcanizing the unvulcanized sealing member, to have a Is the method.
(7) A seventh invention is pre-Symbol a reduced diameter portion of the seal member produced by the production method of the described sealing member (6), an end portion side that is deformed by radial scaling of the bead lock segments in to a tire building drum, characterized in that a peripheral surface of the bead lock segments covering the Migihitsuji.
(8) The eighth invention is a seal member manufactured by the method for manufacturing a seal member described in (6) .

  According to the present invention, since the diameter of the outer extending portion of the seal member is formed in advance so as to be smaller than the inner end in anticipation of the deformation flaw, the expansion and contraction in the radial direction of the bead lock segment is repeated. Even if the seal member has a deformed wrinkle, it does not hinder the mounting of the tire constituent member (band) to the tire molding drum as in the prior art.

It is sectional drawing which expanded and showed the vicinity of the bead lock segment of the shaping | molding drum (mechanical drum) of the TBR tire which concerns on embodiment of this invention. It is sectional drawing which shows the state which wound the unvulcanized seal packing around the mold for seal packing. It is front sectional drawing of the bead lock segment vicinity of the conventional tire shaping | molding drum. It is sectional drawing explaining a state when a tire structural member is supported by the bead lock segment shown in FIG. FIG. 4 is a view similar to FIG. 3 for explaining a state in which the end portion of the seal packing is deformed and enlarged and hits the insertion end when the tire constituent member is inserted into the tire forming drum.

Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of a tire forming drum having a bead lock segment 120 that presses a tire component (or band) K against a bead (not shown) in order to form a TBR (truck / bus) tire according to the present embodiment. FIG. 2 is a cross-sectional view showing a part of a bead lock segment (or bead lock shoe) 120 in an enlarged manner in a part of a mechanical drum 100.

  The tire forming drum 100 according to the present embodiment has a horizontal cylindrical drum main shaft (not shown) connected to the drive unit of the tire forming apparatus, as in the conventional one already described, and this drum main shaft. In this case, an annular sliding body (not shown) including a plurality of folding fingers 115 including a pair of rollers 117 that folds the tire constituent member K around a bead with a filler is externally disposed.

The bead lock segment 120 is configured to be freely expandable and contractable in the radial direction of the forming drum by an appropriate means, as in the conventional one, and a concave surface 122 is formed on the peripheral surface thereof. Further, a seal member, here, a seal packing 110 (outside extending portion 110c thereof) is disposed so as to cover the peripheral surface of the bead lock segment 120.
The base end portion 110a of the seal packing 110 is sandwiched between an inner ring 112 and an outer ring 114 that are integrally connected to the sliding body, and the base end portion 110a is similar to the conventional seal member 58 (FIG. 3). A cylindrical inner extending portion 110b extends radially outward from the outer end of the inner extending portion 110b toward the inner side in the axial direction (the right side in the drawing, that is, the center side of the tire molding drum). A cylindrical outer extending portion 110c is continuously extended toward the outer side in the axial direction by folding back at the inner end in the direction.

  As shown in FIG. 1, the outer extending portion 110c of the seal packing 110 is molded into a shape whose diameter is reduced by drawing a large arc toward the outer end in the axial direction (left end in the figure). Therefore, as described above, even if the outer extending portion 110c of the seal packing 110 is deformed during repeated radial expansion and contraction of the bead lock segment 120, the tire constituent member for the tire molding drum as in the related art is used. Will not interfere with the installation of the.

Next, molding of the seal packing 110 that is the subject of the present invention will be described.
FIG. 2 is a cross-sectional view showing a state in which an unvulcanized seal packing 110 that is an unvulcanized seal member is wound around a seal packing mold 130.
The seal packing mold 130 includes a molding outer ring 132 and a molding member provided with a small-diameter protrusion 134a that fits in a recess 132a formed on the axial inner end side of the molding outer ring 132 on the axial outer end side. It consists of an inner ring 134.

The outer peripheral surface of the outer ring 132 for molding is not yet defined from the starting point (A) with the position corresponding to the portion to be disposed on the inner end of the bead lock segment 120 of the seal packing 110 after molding as the starting point (A). The vulcanized seal packing 110 is formed in a continuous shape up to the end point (B) at which the tip of the outer extending portion 110c reaches, that is, between the points A and B becomes one large arc (diameter R). Here, for the diameter R, when the tangent line is drawn at the starting point (A), the length of the perpendicular line from the ending point (B) to the tangent line (referred to as the down amount) is used for stacking that constitutes the unvulcanized seal packing 110 It is set so that a gentle arc can be formed so as to correspond to several gauges of rubberized cord cloth (treating member).
If the above-mentioned down amount of the actual diameter of the unvulcanized seal packing 110 is 0.4 to 2.8% (practically 2 to 10 mm) of the maximum diameter of the seal packing mold 130, the seal packing 110 is repeated. Even when the end portion is warped, the seal packing 110 does not interfere when the tire constituent member K is mounted on the tire molding drum 100.

The belt-shaped unvulcanized seal packing 110 has one end (base end) side formed adjacent to the recess 132a of the molding outer ring 132 and the small-diameter projection of the molding inner ring 134, and a molding 134b. In the state of being sandwiched between the inner peripheral surfaces of the concave portion 132a of the outer ring 132 for use, the outer end portion in the radial direction is bent to the right side in FIG. 110c is folded back according to a specified width and wound around the peripheral surface of the seal packing mold 130.
In the present embodiment, a positioning ring 140 is attached to the left end of the molding surface 132b of the molding outer ring 132 of the seal packing mold 130 in the drawing, and the left end of the unvulcanized seal packing 110 in the drawing. Is positioned by the positioning ring 140.

The unvulcanized seal packing 110 is tightly wound around the molding surface 132b continuously reduced in diameter along the arc of the molding outer ring 132 as described above, and is vulcanized in a vulcanizing apparatus (not shown) to obtain a product. As a seal packing 110.
The object of the present invention can also be achieved by reducing the outer diameter of the seal packing 110 while keeping the diameter of the molding outer ring 132 constant. However, when the seal packing 110 is thinned, its durability is lowered, and the thinned portion becomes easy to move. Therefore, it is preferable to preliminarily mold the diameter as described above.

According to this embodiment, in addition to the effects already described, the following operational effects can be obtained. That is,
(1) When the tire constituent member (band) is attached to the molding drum, a trouble caused by the centerless of the tire constituent member, which has conventionally occurred, can be eliminated.
(2) In addition, troubles due to the expansion of the diameter due to deformation of the seal member will be eliminated at least.
(I) Emergency measures such as cutting off the end of the seal member with a knife, which has been conventionally performed when trouble occurs, can be reduced.
(Ii) Scrap costs and dismantling costs for tire components (bands) can be reduced.
(Iii) It is possible to reduce the molding loss for handling the trouble and reduce the burden on the operator.

  DESCRIPTION OF SYMBOLS 21,100 ... Tire shaping | molding drum, 22 ... Drum main shaft, 23 ... Screw shaft, 28 ... Nut, 30 ... Connection block, 35 ... Sliding body, 44 ... Bead lock Segment, 58 ... Seal member, 67 ... Folding finger, 110 ... Seal packing, 112 ... Inner ring, 114 ... Outer ring, 120 ... Bead lock segment, 130 ... Seal Packing mold, 132 ... molding outer ring, 132a ... recess, 134 ... molding inner ring, 140 ... positioning ring, K ... tire component, B ... bead.

Claims (8)

In a tire molding drum including a bead lock segment that presses a tire constituent member against a bead, a molding device for a seal member that seals between the bead lock segment and the tire constituent member,
Comprising a ring boss seal member mold for winding the band-shaped uncured seal member,
The sealing member for the mold when the sheet seal member is disposed between the bead lock segments and the tire component member, an end portion of the unvulcanized sealing member that would be deformed by radial scaling of the bead lock segments molding apparatus of the seal member, characterized in that it has a small diameter portion you condensation-diameter type side. In the molding apparatus of the sealing member according to claim 1,
The small-diameter portion is formed in a shape that continuously decreases in diameter along a single arc from a predetermined position of the annular molding surface of the mold for the seal member toward an end portion of the molding surface. A sealing member molding apparatus. In the molding apparatus of the sealing member according to claim 2,
The mold for a seal member is composed of an outer ring and an inner ring, the unvulcanized seal member is sandwiched at the base end by the outer ring and the inner ring, and the predetermined position is the position of the seal member to be molded An apparatus for molding a seal member, which is a position for molding a portion to be disposed on an inner end of a bead lock segment. In the molding apparatus of the seal member according to claim 2 or 3,
A sealing member molding apparatus, wherein the outer ring is provided with a positioning ring for defining a width of the seal member. In the molding apparatus of the sealing member according to any one of claims 1 to 4 ,
Furthermore, the manufacturing apparatus of the sealing member characterized by provided with the vulcanizer. A method of manufacturing a sealing member a tire component member Te tire building drum odor having a bead lock segments pressed against the bead to seal between bicycloalkyl over de lock segments and the tire component member,
Put come winding an unvulcanized sealing member around the sealing member for a mold at one end with a small diameter portion, when the seal member is disposed between the bead lock segments and the tire component member, scaled radial bead lock segments Forming a reduced diameter portion on the end side of the unvulcanized seal member to be deformed by :
Vulcanizing the unvulcanized seal member;
The manufacturing method of the sealing member characterized by having. The reduced diameter portion of the seal member produced by the production method of the described sealing member to claim 6, in the end portion side, which is deformed by radial scaling of the bead lock segment, covering the circumferential surface of the bead lock segments A tire forming drum characterized by being arranged like this . A seal member manufactured by the method for manufacturing a seal member according to claim 6.

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