JP2015214074A - Manufacturing method of run-flat tire and molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and a molding device of a run-flat tire which can prevent occurrence of unintended disturbance resulting from a protrusion of a run-flat liner when joining a carcass member to a primary molding having two pieces of the annular run-flat liners.SOLUTION: External peripheral faces of two pieces of run-flat liners 11 are made to abut on an internal peripheral face of a carcass member 14 by making a protruded part 4a formed at an external peripheral face of a molding drum 2 protrude to an external peripheral side in a state that a carcass body 13 is externally fit to a primary molding 9, two pieces of bead members 15 are fixed to prescribed positions of the molding drum 2 in a drum axial direction by making a pair of bead lock parts 4 protrude to the external peripheral side, and an external peripheral face of an inner liner and an internal peripheral face of the carcass member 14 are joined to each other by expanding the inner liner 10 within a range between the two pieces of the run-flat liners 11 to the external peripheral side in a state that an interval between the two pieces of the bead members 15 is not changed and held by a bead lock part 4.

Description

  The present invention relates to a method and apparatus for manufacturing a run-flat tire, and more specifically, due to the protrusion of a run-flat liner when a carcass member is joined to a primary molded body having two annular run-flat liners. The present invention relates to a method and apparatus for manufacturing a run-flat tire that can prevent the occurrence of inadvertent disturbance.

  A run flat tire that enables traveling in a punctured state includes a thick side reinforcing layer having a crescent-shaped cross section inside a sidewall portion (see, for example, Patent Documents 1 and 2). Conventionally, in the production process of a run flat tire, for example, a primary molded body is formed by arranging an annular run flat liner at an interval in the cylinder axis direction on a cylindrical inner liner wound around an outer peripheral surface of a shaping drum. To do. Next, a carcass member is joined to the outer peripheral surface of the primary molded body to form a band member.

  The run flat liner is a member that forms a side reinforcing layer in the manufactured run flat tire. Therefore, the primary molded body is in a state in which the run flat liner portion locally protrudes to the outer peripheral side. Therefore, when the carcass member is joined to the outer peripheral surface of the primary molded body, the carcass member largely deforms following the protrusion of the run flat liner, resulting in inadvertent disturbance. That is, a band member having a carcass member that is inadvertently disturbed is formed.

  When this band member is used in a subsequent molding process to produce a green tire, and then this green tire is vulcanized, a run-flat tire having a disordered carcass member is produced. If the carcass member is disturbed in this way, the uniformity of the run-flat tire may be adversely affected, and therefore, when the carcass member is joined to the primary molded body and the band member is formed, inadvertent disturbance occurs. It is important not to let them. Here, for example, the drum surface can be designed to have a depression having the same shape as that of the run-flat liner, and the outer peripheral surface of the primary molded body wound around the drum surface can be formed into a shape having no irregularities. In this case, however, a dedicated drum is required every time the run-flat liner has a different shape. Along with this, there arises a problem that the drum must be replaced every time a tire having a different run-flat shape is manufactured.

Japanese Patent Laid-Open No. 7-3030412 JP 2009-61866 A

  An object of the present invention is to provide a run flat that can prevent inadvertent turbulence caused by the protrusion of the run flat liner when the carcass member is joined to a primary molded body having two annular run flat liners. A tire manufacturing method and a molding apparatus are provided.

  In order to achieve the above object, a method for producing a run-flat tire according to the present invention includes two annular tires arranged on the outer peripheral surface of a cylindrical inner liner formed on the outer peripheral surface of a forming drum with a space in the cylinder axis direction. Extrapolating the carcass body provided with two annular bead members arranged at intervals in the cylinder axis direction on the outer peripheral surface of the cylindrical carcass member to the primary molded body provided with the run flat liner, The band member is formed by joining the inner peripheral surface of the carcass body and the outer peripheral surface of the primary molded body, and then the cylindrical belt member including the belt material is extrapolated to the band member. The two bead members are moved in the direction in which the two bead members are brought closer to contract the forming drum in the drum axial direction, and the region between the two bead members of the band member is expanded to the outer peripheral side, Inflated In the method of manufacturing a run flat tire in which the green tire is formed by joining the belt member to the outer peripheral surface and the green tire is vulcanized by a vulcanizer, the carcass body is extrapolated to the primary molded body Then, the outer peripheral surface of the two run flat liners is moved by projecting and moving the protruding portion provided on the outer peripheral surface of the molding drum corresponding to the range in which the two run flat liners are disposed. Are brought into contact with the inner peripheral surface of the carcass member, and a pair of bead lock portions arranged on the outer peripheral surface of the forming drum and spaced apart in the drum axial direction on the outer side in the drum axial direction than the protrusions are arranged on the outer periphery. The inner liner and the carcass portion between the outer peripheral surface of each of the bead lock portions and the inner peripheral surface of the two bead members. The two bead members are fixed at a predetermined position in the drum axial direction of the forming drum with the interposition of, and then held by the bead lock portion without changing the interval between the two bead members. The band member is formed by joining the outer peripheral surface of the inner liner and the inner peripheral surface of the carcass member by expanding the inner liner between two run flat liners to the outer peripheral side. To do.

  A molding apparatus for a run-flat tire according to the present invention has a molding drum provided with a pair of bead lock portions projecting and moving on the outer circumferential surface on the outer circumferential surface, and the outer circumferential surface of the cylindrical inner liner on the outer circumferential surface of the molding drum. A primary molded body having two annular run-flat liners arranged at intervals in the cylinder axis direction is formed, and the primary molded body is spaced apart in the cylinder axis direction on the outer peripheral surface of the cylindrical carcass member. A carcass body provided with two annular bead members arranged in the manner is extrapolated, and a band member is formed by closely contacting the inner peripheral surface of the carcass body and the outer peripheral surface of the primary molded body. A cylindrical belt member including a belt member is extrapolated to the member, and the two bead members are moved closer to each other to contract the molding drum in the drum axial direction and the band member 2 Book bee In a run-flat tire molding apparatus in which a region between the members is expanded to the outer peripheral side, and the belt member is bonded to the expanded outer peripheral surface of the band member to form the green tire, the outer periphery of the molding drum A pair of protrusions are formed on the surface so as to protrude and move to the outer peripheral side at intervals in the drum axis direction on the inner side in the drum axis direction than the respective bead lock parts. The two run-flat liners are provided by holding the holding tool and projecting and moving the protruding portion to the outer peripheral side in a state where the carcass body held by the holding tool is extrapolated to the primary molded body. The outer peripheral surface of each bead lock portion is brought into contact with the inner peripheral surface of the carcass member, and the bead lock portion is protruded and moved to the outer peripheral side. The inner liner and the carcass member are interposed between the inner peripheral surfaces of the bead members, and the two bead members are fixed at predetermined positions in the drum axial direction of the forming drum. The inner liner between the two run-flat liners and the inner peripheral surface of the carcass member are expanded by expanding the inner liner between the two run-flat liners to the outer peripheral side while maintaining the interval between the bead members of the carcass member. And a band member is formed.

  According to the present invention, in a state where the carcass body is extrapolated to the primary molded body, the outer peripheral surfaces of the two run flat liners are brought into contact with the inner peripheral surface of the carcass member, and a pair of bead lock portions are provided. The two bead members are fixed to a predetermined position in the drum axial direction of the forming drum by projecting and moving to the outer peripheral side, and the carcass body is substantially deformed by the projecting shape of the two run flat liners. Set in a state that does not occur automatically. Next, the inner liner in the range between the two run-flat liners is expanded to the outer peripheral side in a state where the distance between the two bead members is kept unchanged by the bead lock portion. Since the band member is formed by joining the outer peripheral surface of the inner liner and the inner peripheral surface of the carcass member, the inner liner is deformed and the two are joined without substantially deforming the carcass body. Therefore, when the carcass member is joined to the primary molded body including the two annular run flat liners, it is possible to prevent the carcass member from being inadvertently disturbed due to the protrusion of the run flat liner.

  Since the green tire that does not cause the above-mentioned inadvertent disturbance is formed on the carcass member in this way, the run-flat tire manufactured by vulcanizing the green tire is a high-quality run-flat tire with good uniformity and the like. become. In addition, it is not necessary to replace the molding drum every time tires having different run-flat liner shapes are manufactured, which is advantageous in improving productivity.

It is explanatory drawing which illustrates the manufacturing apparatus of the pneumatic tire of this invention partially in cross section. It is a front view which illustrates the forming drum of FIG. FIG. 2 is a front view illustrating a state where the forming drum of FIG. 1 is contracted in the drum axial direction. It is explanatory drawing which illustrates the process of extrapolating a carcass body to a primary molded object by upper half sectional view. It is explanatory drawing which illustrates the process of making the outer peripheral surface of two run flat liners contact | abut to the inner peripheral surface of a carcass member by upper half sectional view. It is explanatory drawing which illustrates the process of fixing two bead members in the drum axial direction predetermined position of a shaping | molding drum with a pair of bead lock part by upper half sectional view. It is explanatory drawing which illustrates the process of joining the outer peripheral surface of the inner liner of the range between two run flat liners, and the inner peripheral surface of a carcass member by upper half sectional view. It is explanatory drawing which illustrates a process which joins a belt member to the outer peripheral surface to which the band member was expanded, and shape | molds a green tire, making a part sectional view. It is explanatory drawing which illustrates the process of vulcanizing a green tire by the left half sectional view.

  Hereinafter, a method and a manufacturing apparatus for a run flat tire according to the present invention will be described based on the embodiments shown in the drawings.

  A run-flat tire molding apparatus 1 of the present invention illustrated in FIGS. 1 and 2 includes a molding drum 2 and a holder 5. The holder 5 holds both ends of the carcass body 13 formed separately in the cylinder axis direction. The holder 5 is composed of, for example, a pair of annular bodies that move so that the interval between them can be changed.

  The forming drum 2 includes an annular metal side drum portion 2a at both ends in the drum axial direction, and a support 3 at the central portion in the drum axial direction. The side drum portion 2a facing the drum axis direction moves so as to approach and separate from the drum axis direction. The drum axis direction is the left-right direction in FIGS.

  Each side drum portion 2a has a pair of bead lock portions 4 projecting and moving on the outer peripheral surface on the outer peripheral surface, and a projecting portion 4a disposed on the inner side in the drum axial direction than each bead lock portion 4 to project and move to the outer peripheral side And are provided. That is, on the outer peripheral surface of the forming drum 2, a pair of projecting portions 4 a are provided on the inner side in the drum axial direction with respect to each bead lock portion 4 and spaced in the drum axial direction.

  The support body 3 of this embodiment is composed of a plurality of receiving plates 3 a facing the drum axis direction of the forming drum 2. One end portion of each receiving plate 3a is attached to the side drum portion 2a, and the other end portion is a free end. The receiving plates 3a facing each other in the drum axial direction are offset in the drum circumferential direction and arranged in a nested manner.

As shown in FIG. 3, the receiving plate 3 a attached to each side drum portion 2 a receives the receiving on the side facing the drum axis direction when the opposite side drum portion 2 a moves close to the drum axis direction. It is set so as to enter the gap between the plates 3a adjacent to each other in the drum circumferential direction. Therefore, even if the opposing side drum portions 2a are moved close to each other in the drum axis direction, the receiving drums 3a attached to the respective side drum portions 2a do not interfere with each other, and the molding drum 2 can be smoothly moved in the drum axis direction. Can be shrunk.

  Hereinafter, an example of the procedure of the method for manufacturing the run flat tire of the present invention will be described.

  First, as illustrated in FIG. 4, two annular rings arranged on the outer peripheral surface of the forming drum 2 and spaced on the outer peripheral surface of the cylindrical inner liner 10 in the cylinder axis direction (that is, the drum axis direction). The primary molded body 9 provided with the run flat liner 11 is molded. For example, the tubular primary molded body 9 is formed by winding the belt-shaped inner liner 10, the belt-shaped run flat liner 11, and the side rubber 12 while rotating the molding drum 2. The run flat liner 11 is a thick member that forms the side reinforcing layers 11 in the manufactured run flat tire T.

  The inner liner 10 is wound around the forming drum 2 while being supported by the receiving plate 3a. The receiving plates 3a fixed to the side drum portions 2a facing each other in the drum axis direction are in positions that slightly overlap in the drum axis direction. The outer peripheral surface of the receiving plate 3a is in a state parallel to the drum axis direction in a sectional view.

  Both ends of the separately formed carcass body 13 in the cylinder axis direction are held by the holder 5, and the carcass body 13 is extrapolated to the primary molded body 9. The carcass body 13 includes a pair of two annular bead members 15 arranged on the outer peripheral surface of the cylindrical carcass member 14 with a space in the cylinder axis direction. The inner peripheral surface of the bead member 15 is temporarily press-bonded to the outer peripheral surface of the carcass member 14.

  Next, the inner peripheral surface of the carcass body 13 and the outer peripheral surface of the primary molded body 9 are joined to form the band member 8. At this time, as illustrated in FIG. 5, in a state where the carcass body 13 is extrapolated to the primary molded body 9, the protruding portion 4 a corresponding to the range in which the two run flat liners 11 are disposed protrudes to the outer peripheral side. Move. As a result, the outer peripheral surfaces of the two run flat liners 11 are brought into contact with the inner peripheral surface of the carcass member 14. The inner liner 10 and the carcass member 14 in the range between the two run flat liners 11 are kept in a separated state without being brought into contact with each other.

  In addition, as illustrated in FIG. 6, the pair of bead lock portions 4 is moved to protrude toward the outer peripheral side. As a result, the inner bead 10 and the carcass member 14 are interposed between the outer peripheral surfaces of the respective bead lock portions 4 and the inner peripheral surfaces of the two bead members 15 so that the two bead members 15 are attached to the molding drum 2. It is fixed at a predetermined position in the drum axis direction.

  The process illustrated in FIG. 5 and the process illustrated in FIG. 6 can be performed simultaneously. Alternatively, the process illustrated in FIG. 5 can be performed before or after the process illustrated in FIG.

  Next, by increasing the internal pressure of the forming drum 2 with the bead lock portion 4 protruding as illustrated in FIG. 7 being held without changing the interval between the two bead members 15 in the drum axis direction, The inner liner 10 in the range between the two run flat liners 11 is expanded to the outer peripheral side. Thus, the band member 8 is formed by joining the outer peripheral surface of the inner liner 10 and the inner peripheral surface of the carcass member 14 in a range between the two run flat liners 11.

  Next, as illustrated in FIG. 8, a cylindrical belt member 16 including the belt material 17 is extrapolated to the band member 8, and the side drum portion 2 a facing the drum axis direction is brought close to the drum axis direction. By moving it, the two bead members 15 are moved in the direction of approaching. As a result, the molding drum 2 is contracted in the drum axial direction, and the internal pressure of the molding drum 2 is increased to expand the region between the two bead members 15 of the band member 8 to the outer peripheral side.

  The inner peripheral surface of the belt member 16 is joined to the outer peripheral surface of the band member 8 in the expanded state. The belt member 16 includes a belt material 17 and a tread rubber 18 laminated on the outer peripheral side thereof. The portion of the band member 8 that protrudes outward in the drum axial direction from the bead member 15 is turned up by a known turn-up mechanism and joined to the opposite portion of the band member 8 to form the green tire G. The outer peripheral surface of the belt member 16 joined to the band member 8 is pressed by a pressing roller or the like to join both together more firmly.

  Next, the green tire G is removed from the molding drum 2 and transferred to the vulcanizer 6. In this vulcanizing device 6, as illustrated in FIG. 9, a green tire G is disposed in a mold 7 attached to the vulcanizing device 6. Then, the mold 7 is closed, the heated fluid H or the pressurized fluid P is supplied to the vulcanizing bladder 6a and inflated, and the green tire G is vulcanized. The run-flat tire T is completed by vulcanizing for a predetermined time under predetermined conditions.

  As described above, in the present invention, when the band member 8 is formed, the outer peripheral surface of the two run flat liners 11 is used as the inner peripheral surface of the carcass member 14 in a state where the carcass body 13 is extrapolated to the primary molded body 9. The two bead members 15 are fixed at predetermined positions in the drum axial direction by the pair of bead lock portions 4 which are brought into contact with each other and protruded to the outer peripheral side, and the carcass body 13 is formed by the projecting shape of the two run flat liners 11. Set in a state where inadvertent deformation does not occur substantially. Then, the inner liner 10 in the range between the two run-flat liners 11 is expanded to the outer peripheral side in a state where the bead lock portion 4 holds the two bead members 15 without changing the distance between them. Since the outer peripheral surface of the liner 10 and the inner peripheral surface of the carcass member 14 are joined, the carcass body 13 is not substantially deformed, but the inner liner 10 is deformed and both are joined. Therefore, it is possible to prevent the carcass member 14 from being accidentally disturbed due to the protrusion of the run flat liner 11.

  Since the green tire G that does not cause the above-described inadvertent disturbance is formed on the carcass member 14 in this way, the run flat tire T including the side reinforcing layer 11 manufactured by vulcanizing the green tire G is Uniformity, etc. will be high quality.

  Further, since it is not necessary to replace the molding drum 2 every time the run flat tire T having a different shape of the run flat liner 11 is manufactured, additional drum replacement work does not occur. Thus, since the molding apparatus 1 of the present invention is a highly versatile apparatus, it is advantageous for improving tire productivity.

  In the step of bringing the outer peripheral surfaces of the two run flat liners 11 illustrated in FIG. 5 into contact with the inner peripheral surface of the carcass member 14, the carcass member 14 may slightly project and deform toward the outer peripheral side due to the contact between the two. is there. Therefore, when the two are brought into contact with each other, in synchronism with the projecting deformation toward the outer peripheral side of the carcass member 14 due to the contact between the two, the pair of annular bodies constituting the holder 5 are arranged in the drum axis direction so as to be close to each other. It is good to move a little. That is, when the two are brought into contact with each other, both ends of the carcass member 14 in the cylinder axis direction are moved in directions close to each other, thereby suppressing the extension of the carcass member 14 in the cylinder axis direction. Thereby, disorder of the carcass member 14 can be prevented.

DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Molding drum 2a Side drum part 3 Support body 3a Base plate 4 Bead lock part 4a Protrusion part 5 Holding tool 6 Vulcanization apparatus 6a Vulcanization bladder 7 Mold 8 Band member 9 Primary molded object 10 Inner liner 11 Run flat liner (Side reinforcement layer)
12 Side rubber 13 Carcass body 14 Carcass member 15 Bead member 16 Belt member 17 Belt material 18 Tread rubber G Green tire T Run flat tire

Claims (4)

A cylindrical carcass member is formed on a primary molded body having two annular run-flat liners arranged on the outer peripheral surface of a cylindrical inner liner formed on the outer peripheral surface of a forming drum at intervals in the cylinder axial direction. The carcass body provided with two annular bead members arranged at intervals in the cylinder axis direction on the outer peripheral surface of the carcass body is extrapolated, and then the inner peripheral surface of the carcass body and the outer peripheral surface of the primary molded body are The band member is formed by joining, and then the cylindrical drum member including the belt material is extrapolated to the band member and moved in the direction in which the two bead members are brought close to each other to form the molding drum. The area between the two bead members of the band member is contracted in the drum axis direction and expanded to the outer peripheral side, and the belt member is joined to the expanded outer peripheral surface of the band member to thereby adjust the green tire. Molding In the manufacturing method of a run flat tire vulcanizing the green tire in the vulcanization apparatus,
In a state where the carcass body is extrapolated to the primary molded body, a projecting portion provided on the outer circumferential surface of the molding drum corresponding to a range where the two run flat liners are disposed is projected and moved to the outer circumferential side. As a result, the outer peripheral surfaces of the two run flat liners are brought into contact with the inner peripheral surface of the carcass member, and the outer peripheral surface of the molding drum is spaced in the drum axial direction on the outer side in the drum axial direction than each of the protrusions. The inner liner and the carcass are disposed between the outer peripheral surface of each of the bead lock portions and the inner peripheral surface of the two bead members by projecting and moving a pair of bead lock portions arranged with a gap therebetween. The two bead members are fixed to a predetermined position in the drum axial direction of the forming drum with a member interposed therebetween, and then the two bead members are fixed by the bead lock portion. With the inner liner in the range between the two run-flat liners expanded to the outer peripheral side with the gap kept unchanged, the outer peripheral surface of the inner liner and the inner peripheral surface of the carcass member are A method for manufacturing a run-flat tire, wherein the band member is formed by bonding.   When the outer peripheral surfaces of the two run flat liners are brought into contact with the inner peripheral surface of the carcass member, the cylindrical direction of the carcass member is synchronized with the projecting deformation of the carcass member toward the outer peripheral side due to the contact. The method of manufacturing a run-flat tire according to claim 1, wherein the end portions of the carcass member are restrained from extending in the cylinder axis direction by moving both end portions in directions close to each other. The outer peripheral surface has a forming drum provided with a pair of bead lock portions that project and move to the outer peripheral side, and the outer peripheral surface of the forming drum is disposed on the outer peripheral surface of the cylindrical inner liner with a space in the cylinder axial direction. An annular two bead member formed with a primary molded body provided with two annular run-flat liners and disposed on the outer peripheral surface of the cylindrical carcass member at an interval in the cylinder axial direction on the primary molded body. A band member is formed by extrapolating a carcass body provided with the inner surface of the carcass body and the outer peripheral surface of the primary molded body, and a cylindrical belt including a belt material on the band member. In a state where the members are extrapolated, the two bead members are moved toward each other to contract the molding drum in the drum axial direction, and an area between the two bead members of the band member is on the outer peripheral side. Inflated to In the molding apparatus of the run flat tire wherein the green tire by bonding the belt member to the outer circumferential surface obtained by expansion of the band member is molded,
A pair of projecting portions are formed on the outer peripheral surface of the forming drum so as to project and move to the outer peripheral side at a distance in the drum axial direction inside the respective bead lock portions in the drum axial direction. A holder that holds both ends in the axial direction, and the carcass body held by the holder is extrapolated to the primary molded body to project and move the protrusion to the outer peripheral side, thereby The outer peripheral surface of each of the bead lock portions and the two bead members are moved by bringing the outer peripheral surface of the two run flat liners into contact with the inner peripheral surface of the carcass member and projecting and moving the bead lock portion to the outer peripheral side. The two bead members are fixed at predetermined positions in the drum axial direction of the forming drum by interposing the inner liner and the carcass member between the inner peripheral surfaces of the molding drum and the holding member. The inner liner in the range between the two run-flat liners is expanded to the outer peripheral side in a state where the gap between the two bead members is held by a tool without changing the distance between the outer peripheral surface of the inner liner and the inner liner. A run-flat tire molding apparatus, wherein a band member is molded by joining the inner peripheral surface of the carcass member.   When the outer peripheral surfaces of the two run-flat liners are brought into contact with the inner peripheral surface of the carcass member, the holding tool is synchronized with the projecting deformation of the carcass member toward the outer peripheral side due to the contact. The run-flat tire molding apparatus according to claim 3, wherein both ends of the cylinder axis direction are moved in directions close to each other to prevent the carcass member from extending in the cylinder axis direction.

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