JP2011098497A - Shaping former - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep airtightness inside a raw tire base body without using a bladder while the diameter is expanded. <P>SOLUTION: A bead lock means 12 includes lock segments 20 which are alternatively arranged in a circumferential direction and move between a diameter contraction state Yr and a diameter expansion state Ye by an expansion/contraction means 21. The expansion/contraction means 21 includes a conical slide ring 24 which can move inward and outward in an axial direction inside a guide case 11 and has a tapered surface 26 at an inner end in the axial direction; and a plurality of radially moving pieces 25 which have engaging parts 32 for engaging with the tapered surface 26 and which move the lock segments 20 outward in a radial direction by the slide ring 24 moving inward in the axial direction. In the diameter expansion state Ye, the lock segments 20 are arranged side by side in the circumferential direction so that the circumferential end faces 22 and 23 are butted together and airtightly sealed. The slide ring 24 includes a seal ring 34 which comes into contact with the outer surface in the axial direction of each lock segment 20 in the diameter expansion state Ye for sealing with regard to the outer surface. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a shaping former that inflates and shapes a cylindrical raw tire base in a toroid shape, and particularly in a reduced diameter state of a lock segment that holds a bead portion, the inside of the raw tire base is used without using a bladder. The present invention relates to a shaping former that can be kept airtight and enables shaping without a bladder.

  For example, in the two-stage molding method of a radial tire, a cylindrical raw tire base with a bead core formed at the first stage is transferred to a shaping former of a second stage and expanded into a toroidal shape. The inflated portion of the base is affixed to the inner peripheral surface of a tread ring that has been waiting in advance to form a raw tire.

  As the shaping former, the following Patent Document 1 is known. As shown in FIG. 10 (A), this is provided with bead lock means b for holding the bead portion Tb of the green tire base T on the guide cases a on both sides movable in and out of the axial direction. The bead lock means b includes a cone-shaped slide ring c that can move in and out of the guide case a in the axial direction, and a plurality of lock segments d that are divided in the circumferential direction, and the axial center of the slide ring c. By the inward movement in the direction, the inclined surface c1 at the inner end in the axial direction can be expanded in diameter by pushing up the inner end in the radial direction of each lock segment d.

  However, in this bead lock means b, as shown in FIG. 10 (B), since each lock segment d expands radially in the diameter-expanded state, a gap is generated between the lock segments d, and the inside of the tire base is kept airtight. Can not do. Therefore, a bladder e is provided with one end e1 attached to the radially outer end of the lock segment d forming the bead seat and the other end e2 attached to the guide case a, thereby keeping the inside of the tire base T airtight.

JP 2000-229362 A

  However, since the bladder e is a consumable item and needs frequent replacement, there is a problem in that the production cost is increased and the production efficiency is lowered by stopping the line at the time of replacement. In addition, the air intake / exhaust piping for expanding the bladder e and the equipment cost that requires control are also increased.

  Therefore, the present invention can hold the raw tire base in an airtight state without using a bladder in an expanded state, enables shaping without a bladder, reduces production costs and equipment costs, and improves production efficiency. It aims at providing the shaping former which can plan.

In order to solve the above problems, the invention of claim 1 of the present application includes guide cases on both sides that are concentrically held by the former central shaft portion and can move inward and outward in the axial direction.
A shaping former comprising bead locking means attached to each guide case and holding a bead portion of a cylindrical green tire base,
The bead lock means is divided in the circumferential direction and moved inward and outward in the radial direction by the expansion / contraction means, so that the bead lock means can move between an expanded diameter state holding the bead part and a reduced diameter state opening the bead part. With a locking segment of
The lock segment is composed of a first lock segment having a large circumferential width and a second lock segment having a small circumferential width and alternately arranged in the circumferential direction with the first lock segment. ,
The expansion / contraction means includes
The guide case is arranged so as to be movable inward and outward in the axial direction concentrically with the guide case, and has a tapered surface portion inclined inward in the axial direction at the inner end in the axial direction. A cone-shaped slide ring,
By having an engagement portion that is movably moved inward and outward in the radial direction in the guide case, and that has an engagement portion that engages with the tapered surface portion at the radially inner end portion, the slide ring is moved radially inward in the axial direction With a plurality of radially moving pieces that can move outwards,
In addition, the radially moving piece includes a first moving piece having the first lock segment attached to a radially outer end portion, and a second moving piece having the second lock segment attached thereto.
In addition, the tapered surface portion includes a first tapered surface portion that can be engaged with the engaging portion of the first moving piece, and the first tapered surface portion has a different inclination and the engaging portion of the second moving piece. A second tapered surface portion that can be engaged with
In the reduced diameter state, the second lock segment is positioned radially inward of the first lock segment, and in the expanded diameter state, the first and second lock segments are arranged side by side in the circumferential direction. And while sealing the circumferential end faces in an airtight manner,
The slide ring is characterized in that a seal ring is provided at the upper end portion in the radial direction so as to be in contact with the outer surface in the axial direction of each lock segment in the expanded state and seal between the outer surfaces.

  According to a second aspect of the present invention, the slide ring includes a stopper that comes into contact with a radially outer end face of each of the radially moving pieces in the expanded diameter state.

  According to a third aspect of the present invention, the first and second lock segments are made of a rubber-like elastic body.

  As described above, according to the present invention, the tapered surface portion provided at the inner end in the axial direction of the guide case has a first tapered surface portion that can be engaged with the first moving piece, and the first tapered surface portion is inclined. It is formed of a second tapered surface portion that is different and can be engaged with the second moving piece. Thereby, the radial strokes of the first and second lock segments can be made different, and in the reduced diameter state, the second lock segment is kept inward in the radial direction from the first lock segment. In the expanded diameter state, the first and second lock segments can be arranged side by side in the circumferential direction.

  And in this diameter-expanded state, the circumferential direction end surfaces of the 1st, 2nd lock segment are faced | matched airtightly, and the space between these is sealed. Further, a seal ring is provided at the upper end in the radial direction of the slide ring so as to be in contact with the outer surface in the axial direction of each of the lock segments in the diameter-enlarged state.

  Therefore, the inside of the green tire base can be kept airtight in the expanded diameter state in which the bead portion of the green tire base is held. This eliminates the need for conventional sealing bladders, and causes the above-mentioned problems caused by this bladder, that is, increased production costs, reduced production efficiency due to line stoppage during replacement, and equipment for intake and exhaust piping and control. An increase in cost can be suppressed. Moreover, since the seal ring is attached to the slide ring, wear damage to the seal ring can be suppressed, such as being able to contact only when the diameter is expanded. Further, since the seal ring is not sealed except in the expanded state, it does not prevent the slide ring from moving inward in the axial direction by air.

It is a top view which shows notionally an example of the raw tire shaping | molding line by which the shaping former of this invention was employ | adopted. It is sectional drawing which shows a shaping former. It is sectional drawing which expands and shows a shaping former. It is an end elevation which shows the diameter-expanded state and diameter-reduced state in a 1st, 2nd lock segment. It is a perspective view which shows a guide case. It is a disassembled perspective view which shows the principal part of a bead lock means. It is an expanded sectional view showing a seal state of a lock segment and a guide case in an expanded state. It is explanatory drawing which shows centering of the green tire base | substrate by a bead lock means. (A) is a side view showing a raw tire base, and (B) is an explanatory view showing a formation state of the raw tire base. (A) is sectional drawing which shows an example of the conventional bead lock means, (B) is a side view of the lock segment explaining the problem.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a plan view conceptually showing an example of a raw tire molding line 2 in which the shaping former 1 of the present invention is adopted. In this example, two shaping formers 1 can be repositioned on the turntable 3. Is installed.

  Reference numeral 4 in FIG. 1 is a so-called band drum, which forms a cylindrical raw tire base T with a bead core, for example, as shown in FIG. In this band drum 4, as shown in FIG. 9B, a sheet-like tire case constituent member T 1 such as an inner liner rubber and a carcass is sequentially wound on the outer peripheral surface to form a cylindrical body, The bead core T2 is extrapolated to both end portions in the axial direction. Thereafter, the protruding portion T1a from the bead core T2 is folded back around the bead core T2 by a turn-up bladder attached to the band drum 4 to form the cylindrical raw tire base T. In addition, the raw tire base T can further include a sidewall rubber, a bead reinforcement layer, a clinch rubber and the like as appropriate according to the tire structure. After being transferred to the shape former 1, it can be attached on the shaping former 1.

  Reference numeral 5 in FIG. 1 is a so-called belt drum, and for example, a tread reinforcing cord such as a belt ply and a band ply, and a tread constituent member including a tread rubber are sequentially wound on the outer peripheral surface of the belt drum 5. By doing so, an annular tread ring 6 is formed. The raw tire base T formed by the band drum 4 is transferred to the shaping former 1 at the first standby position P1 by a so-called tire case transport device (not shown). Thereafter, the shaping former 1 is moved to the second standby position P2 by the rotation of the turntable 3, and at the outside of the raw tire base T held in the shaping former 1 at the second standby position P2 in the radial direction. The tread ring 6 formed by the belt drum 5 is carried into the former equator position C by a so-called tread ring conveying device (not shown), and the raw tire base T is expanded and joined to the tread ring 6. .

  Next, as shown in FIG. 2, the shaping former 1 has guide cases 11 on both sides that are concentrically held by the former central shaft portion 10 and can move in and out of the axial direction. A green raw tire base T is concentrically held across the pair of guide cases 11 and 11. Each guide case 11 is provided with a bead lock means 12 that can expand and contract and can hold the bead portion Tb of the green tire base T by expanding the diameter.

  The former center shaft portion 10 includes a spindle main body 10A that is driven by a motor, and a cylindrical sleeve 10B that is concentrically held by the spindle main body 10A via a bearing. The support shaft body 10A and the sleeve 10B are connected in a switchable manner between a connected state in which the support shaft body 10A can rotate integrally and a non-connected state in which only the support shaft body 10A can rotate independently using a clutch mechanism (not shown). The Further, the spindle body 10A is formed with a left screw part 10A1 and a right screw part 10A2 on both sides of the former equator position C, and the left screw is provided in the gap between the spindle body 10A and the sleeve 10B. Nut fittings 13 and 13 are arranged to be screwed with the portion 10A1 and the right screw portion 10A2, respectively. The nut member 13 and the guide case 11 are integrally connected via a connecting member 15 formed in the sleeve 10B and passing through a guide hole 14 extending in the axial direction.

  Accordingly, in the non-connected state, only the spindle main body 10A is rotated by motor driving, and the pair of guide cases 11, 11 are centered on the former equator position C via the nut metal fitting 13 and the connection metal fitting 15. It can be moved in and out of the axial direction. In the connected state, the guide case 11 can rotate together with the spindle body 10A and the sleeve 10B at a predetermined contact / separation position.

  Further, as shown in FIG. 3, the guide case 11 has an inner cylinder portion 16 that is slidably fitted on the sleeve 10B, and a radius at the inner end side and the outer end side in the axial direction of the inner cylinder portion 16. Inner and outer side wall portions 17 and 18 rising outward in the direction, and an outer tube portion 19 extending inward in the axial direction from the radially outer end of the outer side wall portion 18. Thus, the guide case 11 forms a bead lock storage space H between the inner cylinder portion 16 and the outer cylinder portion 19 and between the inner and outer side wall portions 17 and 18.

  Next, the bead lock means 12 includes a plurality of lock segments 20 divided in the circumferential direction, and expansion / contraction means 21. The lock segment 20 can move between the enlarged diameter state Ye holding the bead portion Tb and the reduced diameter state Yr opening the bead portion Tb by moving inward and outward in the radial direction by the expanding / contracting means 21. .

  As shown in FIG. 4, the lock segment 20 is alternately arranged in the circumferential direction with the first lock segment 20A having a large circumferential width and the first lock segment 20A having a small circumferential width. The second lock segment 20B. Both end surfaces 22 in the circumferential direction of the first lock segment 20A are formed as inwardly inclined surfaces that incline in the direction of decreasing the circumferential width inward in the radial direction. Further, both end surfaces 23 in the circumferential direction of the second lock segment 20B are formed as outward inclined surfaces that are inclined in the direction of increasing the circumferential width inward in the radial direction.

  In the diameter-expanded state Ye, the first and second lock segments 20A and 20B are arranged side by side in the circumferential direction, and the circumferential end surfaces 22 and 23 are abutted against each other in an airtight manner, thereby the circumferential end surface. The outer surfaces SA and SB of the first and second lock segments 20A and 20B cooperate with each other to form a substantially continuous cylindrical surface S0. In the reduced diameter state Yr, the second lock segment 20B is retracted inward in the radial direction with respect to the first lock segment 20A, whereby the lock segment 20 can be reduced in diameter.

  In this example, the lock segment 20 is formed of a rubber-like elastic body such as polyurethane so that the circumferential end faces 22 and 23 are hermetically contacted and sealed in the expanded diameter Ye. As shown in FIGS. 3 and 6, the lock segment 20 includes a bead receiving portion 20a for receiving the bottom surface of the bead portion Tb, a radially outer side projecting from the axially inner end thereof, and an inner portion in the axial direction of the bead portion Tb. An upper projecting piece 20b having an upper flange shape that contacts the side surface to position the bead portion Tb, and a lower projecting piece 20c that projects radially inward from the axially outer end of the bead receiving portion 20a. .

  Next, the expansion / contraction means 21 is movable in the guide case 11 radially inward and outward in the guide case 11 and a slide ring 24 arranged so as to be movable inward and outward in the axial direction concentrically with the guide case 11. And a plurality of radially moving pieces 25 arranged on the surface.

  Specifically, as shown in FIGS. 3 and 5, the slide ring 24 is a piston that can slide in the beadlock storage space H in the axial direction, and the inner end in the axial direction is connected to the shaft. It is formed as a cone-shaped ring body having a tapered surface portion 26 inclined inward in the radial direction toward the center inward. The slide ring 24 is in airtight contact with the outer peripheral surface of the inner cylindrical portion 16 and the inner peripheral surface of the outer cylindrical portion 19 through a sealing material 27 such as O long, and in this example, the outer side wall portion 18 is in contact with the outer peripheral surface. The slide ring 24 can slide in the axial direction when compressed air flows in from the air flow path 28 that passes through the air and passes through the bead lock storage space H. A key groove 29 a extending in the axial direction is provided on the inner peripheral surface of the slide ring 24, and the slide ring 24 is prevented from rotating by engaging with the key groove 29 a on the outer peripheral surface of the inner cylinder portion 16. However, a key 29b for guiding in the axial direction protrudes.

  The tapered surface portion 26 is formed of first and second tapered surface portions 26A and 26B that are different in inclination and are alternately arranged in the circumferential direction. In the present example, the second tapered surface portion 26B is composed of a single inclined surface having a constant gradient. In addition, the first tapered surface portion 26A passes through the radially outer side of the second tapered surface portion 26B, and in this example, the inner inclined surface portion 26A1 on the inner side in the axial direction extends with substantially the same gradient as the second tapered surface portion 26B. The outer inclined surface portion 26A2 on the outer side in the axial direction that is flush with the second tapered surface portion 26B, and the inner inclined surface portion 26A1 and the outer inclined surface portion 26A2 are more gently inclined than the second tapered surface portion 26B. It is comprised from the intermediate | middle inclined surface part 26A3 to join. As the first tapered surface portion 26A, for example, the inner inclined surface portion 26A1 can be formed with a different gradient from the second tapered surface portion 26B, or the intermediate inclined surface portion 26A3 can be formed as a horizontal surface. It can be modified to various aspects.

  Next, the radial moving piece 25 includes a first moving piece 25A having the first lock segment 20A attached to the radially outer end thereof, and a second moving piece having the second lock segment 20B attached thereto. 25B. Each moving piece 25A, 25B has substantially the same configuration, and as shown in FIG. 6, a base 30 provided with a slightly narrow sub-part 30b on the inner side in the axial center direction of a rectangular block-like main part 30a. In addition, for example, a groove-shaped guide portion 31a extending inward and outward in the radial direction is formed on both side surfaces of the auxiliary portion 30b in the circumferential direction. Further, on the outer surface in the axial direction of the inner side wall portion 17 in the guide case 11, a plurality of, for example, rib-shaped guide portions that engage with the guide portion 31a and guide the movable pieces 25A and 25B inward and outward in the radial direction. 31b is formed in a radial pattern.

  In addition, an engagement portion 32 that engages with the tapered surface portion 26 is provided at the radially inner end portion of each base body 30. In this example, the engaging portion 32 is composed of a roller 32A pivotally attached to the radially inner end portion of the main portion 30a, so that the first tapered surface portion 26A, which is a bent surface, is also smooth. Engagement is achieved.

  The rollers 32A of the first and second moving pieces 25A and 25B roll while in contact with the first and second tapered surface portions 26A and 26B, respectively, and the slide ring 24 moves inward in the axial direction. Accordingly, the first and second lock segments 20A and 20B are respectively pushed up and moved radially outward. At this time, when the roller 32A of the first moving piece 25A is in contact (engagement) with the inner inclined surface portion 26A1, the first lock segment 20A is radially outward from the second lock segment 20B. It moves outward in the radial direction while maintaining a certain distance, that is, preceding at a certain distance. Further, when in contact (engagement) with the middle inclined surface portion 26A3, the first lock segment 20A moves radially outward while reducing the distance from the second lock segment 20B. At the radially outer end position Q of the middle inclined surface portion 26A3, the distance becomes 0, the second lock segment 20B catches up with the first lock segment 20A, and the first and second lock segments 20A, 20B becomes the said diameter expansion state Ye side by side in the circumferential direction.

  Next, in the slide ring 24, as shown in FIGS. 3, 5, and 7, the outer end surface 20 </ b> S is in contact with the axially outer side surface 20 </ b> S of each lock segment 20 in the expanded diameter Ye at the upper end in the radial direction. A seal ring 34 is provided for sealing between the two.

  In this example, an annular protrusion that protrudes outward in the radial direction on the outer peripheral surface of the slide ring 24 and at a position on the inner side in the axial direction from the inner end in the axial direction of the outer cylinder part 19 of the guide case 11. A portion 24a is formed, and the seal ring 34 made of, for example, a rubber-like elastic material is attached to the inner surface in the axial direction of the protruding portion 24a.

  As the slide ring 24 moves inward in the axial direction, each lock segment 20 expands radially outward and reaches the expanded state Ye which is the end of this expanded movement. The seal ring 34 provided on the ring 24 is in contact with the axially outer side surface 20S of the lock segment 20 (corresponding to the axially outer side surface 20S of the lower protruding piece 20c in this example), and the outer side surface 20S. Can be sealed. In the diameter expanded state Ye, as described above, the circumferential end surfaces 22 and 23 of the lock segments 20 are also sealed in an airtight manner, and between the bead portion Tb and the bead receiving portion 20a of the lock segment 20. Is also sealed by the pressure contact between the bead portion Tb and the bead receiving portion 20a. Therefore, in the shaping former 1 of this embodiment, the inside of the raw tire base T can be kept airtight.

  This eliminates the need for conventional sealing bladders, and the problems arising from these bladders, namely, increased production costs, reduced production efficiency due to line stoppage during replacement, and equipment costs for piping and control for intake and exhaust. Can be prevented.

  In addition, since the seal ring 34 is attached to the slide ring 24, the seal ring 34 is not rubbed with other members in a state other than the expanded diameter state Ye, such as being able to contact only in the expanded diameter state Ye. It can suppress wear damage and improve the service life. Further, since sealing is not performed except for the diameter-expanded state Ye, movement of the slide ring 24 inward in the axial center direction by air is not hindered. Further, since the lower protruding piece 20c is provided in the lock segment 20, the outer surface 20S in contact with the seal ring 34 can be secured widely, and the reliability of the seal can be improved.

  The return of the lock segment 20 to the reduced diameter state Yr is performed by contraction by the annular contraction band 35 extending continuously in the circumferential direction. The contraction band 35 is made of, for example, a rubber-like elastic material or a coil spring, and is disposed in a circumferential band receiving groove 36 provided in the base body 30 of the radial movement piece 25.

  Further, the guide case 11 includes a stopper 37 that comes into contact with the radially outer end surface 25S of the radially moving piece 25 in the expanded diameter Ye. This is because the bead portion Tb of the transferred raw tire base T is held by the diameter expansion of the lock segment 20, but at this time, in order to increase the raw tire formation accuracy, it is required to center the raw tire base T. The Therefore, in this example, as shown in FIG. 8, the guide cases 11 and 11 are made to wait in advance at an interval narrower than the final mounting interval of the raw tire base T, and the raw tire base T is received. At this position, the diameter of the lock segment 20 is expanded, and the green tire base T is temporarily held. Thereafter, while maintaining the diameter-expanded state Ye, the guide cases 11 and 11 are moved in the axial direction until the upper protruding pieces 20b of the lock segments 20 on both sides come into contact with the inner side surfaces in the axial direction of the bead portions Tb. Move outward. Thereby, the raw tire base T can be centered.

  However, for this purpose, the bead portion Tb needs to be able to move in the axial direction on the bead receiving portion 20a in the expanded diameter state Ye. For this reason, the outer diameter of the lock segment 20 in the expanded diameter state Ye can be managed with high accuracy. It is required to do. Therefore, in this example, the stopper 37 which regulates the outer diameter of the lock segment 20 in the diameter-expanded state Ye is provided by coming into contact with the radially outer end face 25S of the radial moving piece 25. The stopper 37 has an annular stopper piece 37A extending continuously in the circumferential direction, and is attached to the inner side wall portion 17 of the guide case 11 in this example.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Shaping former 10 Former center axis | shaft 11 Guide case 12 Bead lock means 20 Lock segment 20A 1st lock segment 20B 2nd lock segment 21 Expansion / contraction means 22, 23 Circumferential end surface 24 Slide ring 25 Radial moving piece 25A 1st Moving piece 25B Second moving piece 26 Tapered surface portion 26A First tapered surface portion 26B Second tapered surface portion 32 Engaging portion 34 Seal ring 37 Stopper T Raw tire base Tb Bead portion Ye Expanded state Yr Reduced diameter state

Claims (3)

Guide cases on both sides that are concentrically held in the former central shaft and can move in and out of the axial direction;
A shaping former comprising bead locking means attached to each guide case and holding a bead portion of a cylindrical green tire base,
The bead lock means is divided in the circumferential direction and moved inward and outward in the radial direction by the expansion / contraction means, so that the bead lock means can move between an expanded diameter state holding the bead part and a reduced diameter state opening the bead part. With a locking segment of
The lock segment is composed of a first lock segment having a large circumferential width and a second lock segment having a small circumferential width and alternately arranged in the circumferential direction with the first lock segment. ,
The expansion / contraction means includes
The guide case is arranged so as to be movable inward and outward in the axial direction concentrically with the guide case, and has a tapered surface portion inclined inward in the axial direction at the inner end in the axial direction. A cone-shaped slide ring,
By having an engagement portion that is movably moved inward and outward in the radial direction in the guide case, and that has an engagement portion that engages with the tapered surface portion at the radially inner end portion, the slide ring is moved radially inward in the axial direction. With a plurality of radially moving pieces that can move outwards,
In addition, the radially moving piece includes a first moving piece having the first lock segment attached to a radially outer end portion, and a second moving piece having the second lock segment attached thereto.
In addition, the tapered surface portion includes a first tapered surface portion that can be engaged with the engaging portion of the first moving piece, and the first tapered surface portion has a different inclination and the engaging portion of the second moving piece. A second tapered surface portion that can be engaged with
In the reduced diameter state, the second lock segment is positioned radially inward of the first lock segment, and in the expanded diameter state, the first and second lock segments are arranged side by side in the circumferential direction. And while sealing the circumferential end faces in an airtight manner,
The shaping former is characterized in that a sealing ring is provided at the upper end in the radial direction so as to be in contact with the outer surface in the axial direction of each lock segment in the expanded state and seal between the outer surfaces. .   The shaping former according to claim 1, wherein the slide ring includes a stopper that abuts against a radially outer end surface of each of the radially moving pieces in the expanded diameter state.   The shaping former according to claim 1 or 2, wherein the first and second lock segments are made of a rubber-like elastic body.

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