JP2009083440A - Device and method for manufacturing unvulcanized tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device capable of highly accurately mass-producing unvulcanized tires for pneumatic tires forming a plurality of independent tire air chambers in the tire width direction between a rim and the tire during mounting of the rim and a method for manufacturing the unvulcanized tire. <P>SOLUTION: The manufacturing device 1 of an unvulcanized tire for a pneumatic tire forming the plurality of independent tire air chambers in the tire width direction between the rim and the tire during mounting of the rim is equipped with a molding drum 2 around which a tire structuring member 6 is wrapped, bead locks 3 for fixing and holding a bead core member 7 at a prescribed position on the tire structuring member 6, expansion means 4a, 4b disposed between the bead locks 3 and on the inside of the molding drum 2 for toroidally expanding the section sandwiched by the bead core members 3 of the tire structuring member 6 outward in the radial direction, and bending means 5a, 5b disposed on the outside of the bead locks 3 in the width direction and on the inside of the molding drum 2 for bending both width ends 10 of the tire structuring member 6 outward in the radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a pair of left and right outer bead portions each having a bead core embedded therein, a pair of sidewall portions extending outward in the tire radial direction from the outer bead portions, and a tire radial outer end of each of the pair of sidewall portions. Between the tread portion to be connected and the pair of outer bead portions, the outer bead portion is spaced apart in the tire width direction, and extends from the tire inner surface side of at least one of the sidewall portion and the tread portion to the inner side in the tire radial direction, An inner bead portion formed by burying a bead core at the inner end in the tire radial direction, and at least one partition wall that forms a plurality of independent tire air chambers in the tire width direction between the inner rim and the rim when mounted on the rim. The present invention relates to an apparatus and a method for producing an unvulcanized tire for a pneumatic tire.

  In a conventional pneumatic tire, when the tire is mounted on a rim, the space (air chamber) defined inside is one chamber. For this reason, when the tire is damaged by stepping on a foreign object such as a nail or rubbing against a curb, there is a problem that the internal pressure is lowered and it is difficult to continue running.

  Also, when running on mountain roads with continuous curves in winter, there are situations where ice and snow road surfaces exist in some places, and in conventional tires with one tire chamber, the internal pressure is reduced and the contact area is increased. Although grip performance can be ensured, there is a problem that this is accompanied by a decrease in tire rigidity and steering stability is impaired.

  Furthermore, in the case of running on a continuous curve on an uneven road with large irregularities, in a conventional tire with one tire chamber, the internal pressure is reduced to reduce the longitudinal rigidity of the tire, thereby reducing the vibration riding performance. Although improvement can be aimed at, this has a problem that the lateral rigidity and the longitudinal rigidity of the tire are lowered, and the steering stability is also impaired.

  In order to solve these problems, for example, in Patent Documents 1 and 2, a partition wall is formed on the inner side of the tire so that when the tire is mounted on the rim, independent tire air chambers are provided in the tire width direction. A plurality of pneumatic tires are described.

  In these tires, even if the internal pressure of one of the tire chambers decreases due to damage, other tire chambers support the load, so there is a slight decrease in handling stability and vibration ride comfort, but safety You can continue running. Moreover, desired performance can be easily obtained by changing the internal pressure of each air chamber according to the road surface condition. For example, if the internal pressure of the tire chamber inside the tire width direction is set low and the internal pressure of the tire chamber outside the tire width direction is set high, the rigidity in the vertical direction of the tire decreases and the contact area increases. Since the rigidity in the lateral direction and the longitudinal direction of the tire can be maintained or improved while ensuring the grip performance and the vibration ride comfort, the vibration ride comfort and the driving stability when traveling on rough roads can be secured. .

JP 2003-39914 A JP 2005-219729 A

  As described above, although a tire having a plurality of tire chambers as described in Patent Documents 1 and 2 is excellent in performance, its manufacture is very complicated, and a molding drum like a conventional tire is used. Mass production using was difficult.

  Accordingly, an object of the present invention is to solve these problems, and an object of the present invention is to provide a pneumatic tire having a plurality of independent tire chambers in the tire width direction between the rim and the rim when the rim is mounted. An object of the present invention is to provide a manufacturing apparatus and a manufacturing method that can mass-produce unvulcanized tires for use with high accuracy.

  In order to achieve the above object, an unvulcanized tire manufacturing apparatus according to the present invention includes a pair of left and right outer bead portions in which bead cores are embedded, and a pair of sidewall portions extending outward from the outer bead portions in the tire radial direction. A tread portion that connects outer ends in the tire radial direction of the pair of sidewall portions, and the outer bead portion is provided between the pair of outer bead portions so as to be spaced apart in the tire width direction, and the side It has an inner bead portion that extends inward in the tire radial direction from the tire inner surface side of at least one of the wall portion and the tread portion, and has a bead core embedded at the inner end in the tire radial direction, and between the rim when mounted on the rim. And manufacturing an unvulcanized tire for a pneumatic tire having at least one partition wall forming a plurality of independent tire chambers in the tire width direction. In the apparatus, a tire molding drum around which the tire constituent member is wound, at least three bead locks that fix and hold the bead core member at a predetermined position on the tire constituent member, and an inner side of the molding drum between the bead locks. An expansion means for expanding the section of the tire component member sandwiched between the bead core members in a toroidal shape toward the radially outer side; and disposed inside the molding drum on the outer side in the width direction of the bead lock. And bending means for bending both width end portions of the tire constituent member toward the radially outer side. According to this apparatus, like a conventional pneumatic tire manufacturing apparatus, tire constituent members such as an inner liner member and a carcass ply member are sequentially wound around a molding drum, and a bead core member is disposed at a predetermined position on the tire constituent member. Since the tire constituent member is inflated to a required shape on the drum while being accurately positioned and fixed by the bead lock, a band member, a tread member, etc. can be pasted to form an unvulcanized tire. The unvulcanized tire having a plurality of tire air chambers as described above can be mass-produced with high accuracy in the same manner as a conventional pneumatic tire having a single tire air chamber.

  In such a manufacturing apparatus, it is preferable that the outer diameter of at least one of the bead locks is different from the outer diameters of the other bead locks.

  The unvulcanized tire manufacturing method according to the present invention includes a pair of left and right outer bead portions in which bead cores are embedded, a pair of sidewall portions extending outward in the tire radial direction from the outer bead portions, and the pair of side surfaces. A tread portion that connects each tire radial direction outer end of the wall portion, and the outer bead portion is provided between the pair of outer bead portions so as to be spaced apart in the tire width direction, and the sidewall portion and the tread portion An inner bead portion extending from the inner surface of the tire to the inner side in the tire radial direction and having a bead core embedded at the inner end in the tire radial direction. In a method for producing an unvulcanized tire for a pneumatic tire comprising at least one partition wall in which a plurality of chambers are formed in the tire width direction, The component member is molded into a cylindrical shape, at least three ring-shaped bead core members are arranged on the cylindrical tire component member, the bead core member is fixed on the tire component member, and the bead core member is fixed in the width direction. While moving inward, the section of the tire constituent member sandwiched between the bead core members is expanded in a toroidal shape outward in the radial direction, and both width end portions of the tire constituent member are bent outward in the radial direction. It is characterized by. According to this method, as in the conventional pneumatic tire manufacturing method, a tire constituent member such as an inner liner member or a carcass ply member formed on a cylinder is disposed on the molding drum, and a predetermined position on the tire constituent member is set. The bead core member is arranged on the drum, and the bead core member is positioned and fixed, and the tire constituent member is inflated to a required shape on the drum, and then a band member, a tread member and the like are attached to form an unvulcanized tire. Therefore, the unvulcanized tire having a plurality of tire air chambers as described above can be mass-produced with high accuracy in the same manner as a conventional pneumatic tire having a single tire air chamber.

  In such a manufacturing method, a so-called side-on-tread manufacturing method may be employed in which the tread constituent member is disposed on the tire constituent member inflated in a toroid shape, and both width ends of the tire constituent member are attached to the tread constituent member. Alternatively, a so-called tread-on-side manufacturing method may be employed in which both width end portions of a tire component member are attached to a tire component member inflated in a toroid shape, and the tread component member is disposed on both width end portions. .

  Moreover, in this manufacturing method, it is preferable to arrange | position an adhesion prevention means inside the radial direction of the area pinched | interposed into two bead core members.

  Furthermore, in this manufacturing method, it is preferable that the inner diameter of the outer bead portion is different from the inner diameter of the inner bead portion.

  According to the present invention, a pneumatic tire having a plurality of independent tire chambers in the tire width direction between the rim and the rim when the rim is mounted is highly accurate as in a conventional pneumatic tire having a single tire chamber. This makes it possible to mass-produce.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side cross-sectional view schematically showing a main part of a typical unvulcanized tire manufacturing apparatus according to the present invention. FIGS. 2 to 4 show various types of unvulcanized tires using the manufacturing apparatus. Shown at the manufacturing stage.

  The manufacturing apparatus 1 shown in FIG. 1 includes a molding drum 2, at least three (four in the illustrated example) bead locks 3, and expansion means disposed inside the molding drum 2 between the bead locks 3. Bladders 4a and 4b, and bladders 5a and 5b as bending means disposed inside the molding drum 2 outside the bead lock 3 in the width direction.

  As the molding drum 2, the bead lock 3, and the bladders 4a, 4b, 5a, and 5b, those having the same configuration as that used in a conventional unvulcanized tire manufacturing apparatus can be used. The expansion means is not limited to a bladder. For example, two parts of a tire component are adsorbed on a molding drum along the circumferential direction, and a gas is pumped between the two adsorbed parts. The constituent member may be inflated, or the tire constituent member may be inflated using a mechanically expanding / contracting core. Further, the bending means is not limited to the bladder. For example, the bending means may be a pressing roller that has a roller at the tip and is mechanically driven to press the width end portion of the tire constituent member on the inflated tire constituent member. In the illustrated embodiment, the bead lock 3 and the bladders 4a, 4b, 5a, and 5b are arranged on the concentric axis line with the molding drum 2. However, as long as the fixing of the bead core member and the deformation of the tire constituent members are not hindered. It is not limited to such an arrangement.

  Next, a method for manufacturing an unvulcanized tire using such a manufacturing apparatus will be described.

  First, a tire constituting member 6 made of an inner liner member and a carcass ply member, which is supplied in advance from a winding server (not shown) and is cut in advance according to the size of the product tire, is wound on the molding drum 2 to form a cylindrical shape. To do. At this time, a sidewall member 12 is disposed between the tire constituent member 6 and the molding drum 2 in a portion to be a sidewall portion of the unvulcanized tire. Next, using a bead setter (not shown), the bead core member 7 and the bead filler member 8 are arranged at predetermined positions on the tire constituent member 6 as shown in FIG. The bead filler member 8 can be appropriately modified or omitted depending on the performance required for the product tire. The bead core member 7 is fixed in position on the tire constituent member until, for example, the bead lock 3 is expanded and held on the tire constituent member via the tire constituent member until the molding of the unvulcanized tire is completed. Thus, since the molding is performed in a state where the bead core member 7 is fixed by the bead lock 3, the dimensional error of the molded unvulcanized tire is reduced, and the molding can be performed with high accuracy.

  Next, as in the conventional unvulcanized tire manufacturing process, the section sandwiched between the bead locks 3 while moving the bead locks 3 inward in the width direction so as to bring them close to each other, so-called foot width adjustment. Is bulged and deformed in a toroidal shape outwardly in the radial direction by the bladders 4a and 4b. At this time, the bladder 4a and the bladder 4b may be inflated at the same time. First, the bladder 4a may be inflated after the bladder 4a is inflated, or in the reverse order.

  On a belt tread molding drum (not shown), a belt layer, a belt protective layer, and a tread rubber are sequentially laminated to mold a tread component 9 called a belt tread band. This tread constituent member 9 is placed on the outer periphery of the tire constituent member 6 bulged and deformed in a toroidal shape using a conveying means (not shown) (FIG. 3).

  Next, as shown in FIG. 4, when the bladders 5 a and 5 b are inflated, both end portions 10 of the tire constituent member 6 are bent radially outward and attached to the tread constituent member 9, as shown in FIG. 5. An unvulcanized tire 11 is obtained. When the unvulcanized tire 11 is removed from the molding drum and placed in a vulcanization mold and vulcanized and molded, a pair of left and right outer bead portions each having a bead core embedded therein, and a pair of sides extending outward in the tire radial direction from these outer bead portions The wall portion, the tread portion connecting the tire radial direction outer ends of the pair of sidewall portions, and the outer bead portion between the pair of outer bead portions are provided apart from each other in the tire width direction. And an inner bead portion extending from the tire inner surface side of at least one of the tread portions toward the inner side in the tire radial direction and having a bead core embedded at the inner end in the tire radial direction, and independent from each other when mounted on the rim. A pneumatic tire including at least one partition wall that forms a plurality of tire air chambers in the tire width direction is molded. Moreover, in the molding drum from which the unvulcanized tire is removed, the unvulcanized tire can be repeatedly molded in the same procedure as described above, so that mass production becomes easy.

  In the illustrated embodiment, the tread component member 9 is disposed on the tire component member 6 inflated in a toroid shape, and then the both width end portions 10 of the tire component member 6 are attached to the tread component member 9. Instead of this, the both end portions 10 of the tire constituent member 6 are bent and pasted on the tire constituent member 6 inflated in a toroid shape, and then the tread constituent member 9 is attached on the both end portions 10. You may arrange.

  When the feet are brought close together, the tire constituent members defining the air chambers (corresponding to the partition walls in the product tire) are brought into contact with each other, and the bead lock 3 is approached until the internal volume of the air chamber becomes substantially zero. Also good. In this case, from the viewpoint of preventing the tire constituent members from sticking to each other, before the tire constituent members are wound around the molding drum, the inner side in the radial direction of the section corresponding to the section sandwiched between the two bead core members is prevented. Preferably the means are pre-arranged. As such adhesion preventing means, for example, a release film such as a resin film sheet or stearic acid can be used.

  Further, according to this manufacturing method, not only the unvulcanized tire having the same inner diameter of the outer bead portion and the inner bead portion, but also the inner diameter of the outer bead portion as shown in FIG. It is also possible to produce a different unvulcanized tire.

  Note that the above description shows only a part of the embodiment of the present invention, and these configurations can be combined with each other or various modifications can be made without departing from the gist of the present invention. . For example, in the illustrated embodiment, four bead core members and four bead locks for fixing the bead core member are provided, but these may be three, or five or more, respectively. In the illustrated embodiment, the tire constituent member 6 is wound around the molding drum 2 and formed into a cylindrical shape, but instead, the tire constituent member is wound in a cylindrical shape in advance outside the molding drum 2. Further, a so-called preset member having a bead core member disposed thereon can be conveyed and set on a molding drum.

  As is apparent from the above description, according to the present invention, it is possible to mass-produce uncured tires for pneumatic tires having a plurality of independent tire chambers in the tire width direction between the rims when the rim is mounted. It has become possible to provide a manufacturing apparatus and a manufacturing method.

It is a sectional side view which represents roughly the principal part of the manufacturing apparatus of the typical unvulcanized tire according to this invention. It is a sectional side view which shows the state which fixed the bead core member to the manufacturing apparatus shown in FIG. It is a sectional side view which shows the state which bulged and deformed the tire structural member on the manufacturing apparatus shown in FIG. It is a sectional side view which shows the state which bends the width | variety edge part of a tire structural member on the manufacturing apparatus shown in FIG. 1 is a cross-sectional view in a width direction of a typical unvulcanized tire molded according to the present invention. FIG. 5 is a cross-sectional view in the width direction of another unvulcanized tire molded according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Unvulcanized tire manufacturing apparatus 2 Molding drum 3 Bead lock 4a, 4b Expansion means 5a, 5b Bending means 6 Tire constituent member 7 Bead core member 8 Bead filler member 9 Tread constituent member 10 Width end part of tire constituent member 11 Unvulcanized Tire 12 Side wall member

Claims (7)

A tread that connects a pair of left and right outer bead portions in which bead cores are embedded, a pair of sidewall portions extending outward in the tire radial direction from these outer bead portions, and respective tire radial direction outer ends of the pair of sidewall portions. And the outer bead portion are spaced apart in the tire width direction and extend inward in the tire radial direction from at least one tire inner surface side of the sidewall portion and the tread portion. And at least one partition wall having an inner bead portion formed by burying a bead core at an inner end in the tire radial direction and forming a plurality of independent tire air chambers in the tire width direction between the inner rim and the rim when attached to the rim. In an apparatus for producing an unvulcanized tire for a pneumatic tire comprising:
A molding drum around which the tire component is wound;
At least three bead locks for fixing and holding the bead core member at a predetermined position on the tire constituent member;
An expansion means disposed inside the molding drum between the bead locks and inflating a section of the tire constituent member sandwiched between the bead core members in a toroidal shape toward the radially outer side; and
And a bending means disposed on the outer side in the width direction of the beadlock and on the inner side of the molding drum, and bending means for bending both width end portions of the tire constituent member toward the outer side in the radial direction. Sulfur tire manufacturing equipment.   The unvulcanized tire manufacturing apparatus according to claim 1, wherein an outer diameter of at least one of the bead locks is different from an outer diameter of another bead lock. A tread that connects a pair of left and right outer bead portions in which bead cores are embedded, a pair of sidewall portions extending outward in the tire radial direction from these outer bead portions, and respective tire radial direction outer ends of the pair of sidewall portions. And the outer bead portion are spaced apart in the tire width direction and extend inward in the tire radial direction from at least one tire inner surface side of the sidewall portion and the tread portion. And at least one partition wall having an inner bead portion formed by burying a bead core at an inner end in the tire radial direction and forming a plurality of independent tire air chambers in the tire width direction between the inner rim and the rim when attached to the rim. In a method for producing an unvulcanized tire for a pneumatic tire comprising:
The tire component is molded into a cylindrical shape,
Disposing at least three ring-shaped bead core members on the cylindrical tire constituent member;
Fixing the bead core member on the tire constituent member;
While moving the bead core member inward in the width direction, the section of the tire constituent member is inflated in a toroidal shape toward the radially outer side,
A method for producing an unvulcanized tire, wherein both end portions of the tire constituent member are bent outward in the radial direction.   The manufacturing method of the unvulcanized tire of Claim 3 which arrange | positions a tread structural member on the tire structural member expanded in the said toroidal shape, and affixes the both width | variety edge part of the said tire structural member on the said tread structural member.   The manufacture of the unvulcanized tire according to claim 3, wherein both end portions of the tire constituent member are attached to the tire constituent member inflated in the toroid shape, and the tread constituent member is disposed on the both end portions. Method.   The manufacturing method of the unvulcanized tire as described in any one of Claims 3-5 which arrange | positions an adhesion prevention means inside the radial direction of the area pinched | interposed between the two bead core members.   The method for manufacturing an unvulcanized tire according to any one of claims 3 to 6, wherein an inner diameter of the outer bead portion is different from an inner diameter of the inner bead portion.

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