JP2006021495A - Unvulcanized tire molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unvulcanized tire molding machine which can certainly support a bead part with the help of a bead retaining member and restrain an increase in the manufacturing cost of replacement components in accordance with the kind of tire. <P>SOLUTION: In this unvulcanized tire molding machine, each bead part BE of an inside unvulcanized tire GT, is supported by a pair of the bead retaining members 10 and 11 from the inside, in an axial direction and the inside, in a diametral direction, of the inside unvulcanized tire GT respectively. Further, a first contact member 20 which optionally moves in the axial direction of a rotary shaft 1 by each cylinder 23 and a second contact member 30 which optionally moves in the axial direction of the rotary shaft 1 by a cylinder 32, are brought into contact with the outside, in the axial direction, of the bead part BE supported by each bead retaining member 10 and 11. Consequently, the movement, in the axial direction, of the bead part BE is regulated and each bead part BE does not come off each bead retaining member 10 and 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an unvulcanized tire molding machine that forms an unvulcanized tire by inflating an inner unvulcanized tire in a toroidal shape in a manufacturing process of a pneumatic tire.

  Generally, a pneumatic tire for an automobile is manufactured by molding an unvulcanized tire composed of a plurality of types of unvulcanized rubber members, and vulcanizing the unvulcanized tire in a vulcanization mold. When molding an unvulcanized tire, first, an inner unvulcanized tire including an inner liner member, a side wall member, a carcass member, a pair of bead members, and the like is molded. Next, each bead portion of the inner unvulcanized tire is supported from the axially inner side and the radial inner side of the inner unvulcanized tire by a pair of bead holding members, and the inner unvulcanized tire is expanded from the inner side with compressed air. The bead holding members are moved so as to approach each other, and the inner unvulcanized tire is formed into a toroidal shape. Further, an unvulcanized tire is formed by press-bonding an outer unvulcanized tire made of a belt member, a tread member or the like to the outer peripheral surface thereof.

  In this way, as a bead holding member used in an unvulcanized tire molding machine for forming an unvulcanized tire, an outer peripheral surface is formed along the inner peripheral surface of the bead portion, and a protrusion extending in the radial direction on one end side of the outer peripheral surface. It is known that the shape portion is formed over the entire circumference and the bead portion is supported from the inner side in the axial direction and the inner side in the radial direction of the unvulcanized tire (for example, see Patent Document 1). The unvulcanized tire molding machine is often used in a process of producing a plurality of types of tires in small amounts, for example, in a trial production process.

  However, in the molding machine, the bead portion is supported on the inner side in the axial direction and the inner side in the radial direction of the inner unvulcanized tire, but is not supported on the outer side in the axial direction of the inner unvulcanized tire. For this reason, when the inner unvulcanized tire is molded into a toroidal shape, the bead portion easily falls off the bead holding member due to the pressure of compressed air or the movement of the bead holding member, and the shape of the molded unvulcanized tire is stabilized. It was not easy to make.

In order to solve this, a support member that restricts the movement of the bead portion to the outside in the axial direction is provided at a plurality of locations in the circumferential direction of the bead holding member, and each support member is tilted to the bead member side using compressed air. A device that contacts the bead portion is known (see, for example, Patent Document 2).
JP-A-53-125485 JP 58-175648 A

  However, since the structure of the latter bead holding member is complicated, the manufacturing cost of the bead holding member is higher than that of the former. On the other hand, since the shape of the bead holding member varies depending on the type of tire, a bead holding member is required for each type of inner diameter of the bead portion of each tire in a process of producing a plurality of types of tires in small quantities as in the trial production process. For this reason, it is necessary to prepare a plurality of expensive bead holding members, which are replacement parts of an unvulcanized tire molding machine, according to the type of inner diameter of the bead portion of the tire in a trial production process, etc., which increases the cost of production equipment. There was a problem.

  The present invention has been made in view of the above problems, and the object of the present invention is that the bead portion can be reliably supported by the bead holding member and the production cost of the replacement part according to the type of tire can be reduced. It is providing the unvulcanized tire molding machine which can suppress an increase.

  In order to achieve the above object, the present invention provides a pair of disk-shaped bead holding members for supporting each bead portion of an unvulcanized tire from the inside in the axial direction and the inside in the radial direction, and the bead holding members are coaxial. A non-vulcanized tire molding machine for forming a toroidal shape by inflating an unvulcanized tire in the radial direction, and coaxial with each bead holding member on both sides in the axial direction of the unvulcanized tire. And a pair of moving mechanisms that support each of the contact members so as to be movable in the axial direction of the unvulcanized tire.

  Thereby, each contact member is made to contact | abut to the axial direction outer side in the inner side unvulcanized tire of each bead part supported by each bead holding member, and the movement to the axial direction outer side of each bead part can be controlled. Therefore, when the inner unvulcanized tire is expanded radially outward, each bead portion does not fall off from each bead holding member. Further, in order to form an unvulcanized tire, it is necessary to prepare a pair of bead holding members and a pair of abutting members. Therefore, it is not necessary to make the structures of the bead holding member and the contact member complicated.

  According to the present invention, since the bead portion does not fall off from the bead holding member when the inner unvulcanized tire is expanded radially outward, it is possible to always form an unvulcanized tire having a stable shape. In addition, since it is not necessary to have a complicated structure for the bead holding member and the abutting member prepared for each type of inner diameter of the bead portion of the tire, for example, in the process of producing a plurality of types of tires, such as a trial production process, in a small amount, An increase in the production cost of the bead holding member and the contact member, which are replacement parts of the sulfur tire molding machine, is suppressed, and the cost of production equipment can be reduced.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of an unvulcanized tire molding machine before mounting an inner unvulcanized tire, and FIG. 2 is a line AA in FIG. FIG. 3 is a sectional view of the unvulcanized tire molding machine after the inner unvulcanized tire is mounted, and FIG. 4 is a sectional view of the unvulcanized tire molding machine in which the inner unvulcanized tire is formed in a toroidal shape. FIG. 5 and FIG. 5 are explanatory diagrams of how to attach each bead holding member and each contact member to the unvulcanized tire molding machine.

  The unvulcanized tire molding machine according to the present embodiment is disposed on the rotary shaft 1 as a first support member that is rotatably supported at one end side, and spaced apart from each other in the axial direction on the rotary shaft 1. A pair of bead holding members 10, 11, a first contact member 20 arranged coaxially with each bead holding member 10, 11 on the proximal end side of the rotating shaft 1 of each bead holding member 10, 11, and a bead A second abutting member 30 disposed coaxially with each bead holding member 10, 11 is provided on the distal end side of the rotating shaft 1 of the holding member 10, 11.

  The rotating shaft 1 is composed of a base end side rotating shaft 2 and a tip end side rotating shaft 3, and one end side of the base end side rotating shaft 2 is rotatably supported by a base 1a via a bearing 1b. The distal end side rotating shaft 3 is inserted inside the proximal end side rotating shaft 2, and the distal end side rotating shaft 3 is movable in the axial direction with respect to the proximal end side rotating shaft 2 by a ball screw or a cylinder (not shown). Yes. The proximal end side rotating shaft 2 is rotated by a motor (not shown), and the distal end side rotating shaft 3 is rotated integrally with the proximal end side rotating shaft 2. In addition, a communication pipe 2a is formed in the base end side rotating shaft 2, one end of which communicates with the distal end surface of the base end side rotating shaft 2, and the other end communicates with a compressor for supplying compressed air (not shown). Yes. The communication pipe can also be provided in the distal end side rotating shaft 3.

  Each bead holding member 10, 11 is formed in a disk shape, and projecting portions 10 b, 11 b extending outward in the radial direction are formed on one end side of the outer peripheral surfaces 10 a, 11 a over the entire circumference. The bead holding members 10 and 11 are coaxially arranged with the end faces on the protruding portions 10b and 11b facing each other, and the bead holding members 10 are fixed to the distal end of the base end side fixed shaft 2 by a plurality of bolts 4, The bead holding member 11 is fixed to the distal end of the distal end side fixed shaft 3 by a plurality of bolts 4. Specifically, a flange portion 2b that extends radially outward is formed over the entire circumference in the vicinity of the distal end of the base end side rotation shaft 2, and screw holes that are screwed into the bolts 4 are provided at a plurality of locations in the circumferential direction of the flange portion 2b. It has been. Further, an inner hole 10c as an insertion hole is formed at the center of one bead holding member 10, and a plurality of bolt holes corresponding to the screw holes of the flange portion 2b are provided on the radially outer side of the inner hole 10c. . That is, the distal end of the base end side rotating shaft 2 is inserted into the inner hole 10c of the bead holding member 10, the one end surface of the bead holding member 10 and the one end surface of the flange portion 2b are in contact, and each bolt 4 is connected to the bead holding member. Ten bolt holes are inserted and screwed into the screw holes of the flange portion 2b. Further, a flange portion 3a extending radially outward is formed in the vicinity of the distal end of the distal end side rotation shaft 3 over the entire circumference, and screw holes that are screwed with the bolts 4 are provided at a plurality of locations in the circumferential direction of the flange portion 3a. Yes. Further, an inner hole 11c is formed at the center of the other bead holding member 11, and a plurality of bolt holes corresponding to the screw holes of the flange portion 3a are provided on the radially outer side of the inner hole 11c. That is, the distal end of the distal end side rotation shaft 3 is inserted into the inner hole 11 c of the bead holding member 11 so that one end surface of the bead holding member 11 and one end surface of the flange portion 3 a come into contact with each other, and each bolt 4 is connected to the bead holding member 11. The bolt holes are inserted into the screw holes of the flange portion 3a. Here, the inner diameter of the inner hole 10c of the bead holding member 10 is formed larger than the outer diameters of the distal end side rotating shaft 3 and the flange portion 3a. A seal member (not shown) is attached between each bead holding member 10, 11 and each flange portion 2b, 3a to prevent air from flowing.

  The first abutting member 20 is formed in a disk shape, and a protruding portion 20a extending in the axial direction is formed on the outer circumference in the radial direction on one end surface. Further, the other end side is fixed to the boss 21 with a plurality of bolts 4 in a state in which the protruding portion 20 a faces the tip end side of the rotating shaft 1. The boss 21 is formed in a cylindrical shape, and is rotatably attached to one end side of the support member 22 via a bearing 21b. Near one end of the boss 21, a flange portion 21a extending outward in the radial direction is formed over the entire circumference, and screw holes for screwing with the bolts 4 are provided at a plurality of locations in the circumferential direction of the flange portion 21a. Further, an inner hole 20b as an insertion hole is formed at the center of the first contact member 20, and a plurality of bolt holes corresponding to the screw holes of the flange portion 21a are provided on the radially outer side of the inner hole 20b. It has been. That is, the tip of the boss 21 is inserted into the inner hole 20b of the first contact member 20, the other end surface of the first contact member 20 and one end surface of the flange portion 21a contact each other, and each bolt 4 is Each bolt hole of one contact member 20 is inserted and screwed into each screw hole of the flange portion 21a. Here, the inner diameter of the inner hole 20b of the first contact member 20 is formed larger than the outer diameters of the distal end side rotation shaft 3, the flange portion 3a, the proximal end side rotation shaft 2, and the flange portion 2b.

  A plurality of cylinders 23 as one moving mechanism are provided at intervals in the circumferential direction on the outer peripheral side of the base end side rotating shaft 2 on the other end side of the boss 21, and each cylinder 23 is fixed to the base 1 a. Yes. Each cylinder 23 is formed of a well-known air cylinder, and the rod can be expanded and contracted by compressed air supplied from a compressor (not shown). Further, the rod tip of each cylinder 23 is fixed to the other end side of the support member 22 through which the base end side rotary shaft 2 is inserted, and the support member 22 is extended by the expansion and contraction of the rod of each cylinder 23. It is possible to move in the axial direction. That is, the first abutting member 20 moves in the axial direction of the proximal-side rotating shaft 2 by expansion and contraction of the rod of each cylinder 23.

  The second contact member 30 is formed in a disc shape, and a protruding portion 30a extending in the axial direction is formed on the outer circumference in the radial direction on one end surface. Further, the other end side is fixed to one end side of the boss 31 with a plurality of bolts 4 in a state in which the protruding portion 30 a faces the base end side of the rotating shaft 1. The boss 31 is formed in a cylindrical shape, and is rotatably attached to one end side of a support member 34 fixed to the rod tip of the cylinder 32 via a bearing 31b. Near one end of the boss 31, a flange portion 31 a extending outward in the radial direction is formed, and the flange portion 31 a is provided with screw holes that are screwed into the bolts 4 at a plurality of locations in the circumferential direction. Further, an inner hole 30b is formed at the center of the second contact member 30, and a plurality of bolt holes are provided on the radially outer side of the inner hole 30b so as to correspond to the screw holes of the flange portion 31a. Yes. That is, the tip of the boss 31 is inserted into the inner hole 30b of the second contact member 30, the other end surface of the second contact member 30 contacts one end surface of the flange portion 31a, and each bolt 4 is Each bolt hole of the two abutting members 30 is inserted and screwed into each screw hole of the flange portion 31a.

  The cylinder 32 is a well-known air cylinder, and is fixed to the base 33, and the rod can be expanded and contracted by compressed air supplied from a compressor (not shown). The cylinder 32 also serves as the second support member and the other moving mechanism, and the cylinder 32 and the rotary shaft 1 are arranged coaxially so that their tips are opposed to each other.

  In the above-described unvulcanized tire molding machine, a process of forming an inner unvulcanized tire GT having a pair of bead portions BE on both axial end sides into a toroidal shape is shown. The inner unvulcanized tire GT includes an inner liner member, a sidewall member, a carcass member, a pair of bead portions, and the like, and is formed in a cylindrical shape.

  First, as shown in FIG. 1, the rods of the cylinders 23 and 32 are contracted to move the first contact member 20 and the second contact member 30 away from each other, and the distal end side rotating shaft is moved. 3 is moved to the base end side of the rotating shaft 1 to bring the bead holding members 10 and 11 closer to each other. In this state, the inner unvulcanized tire GT is arranged so that the bead portions BE at both ends thereof are positioned on the outer side in the axial direction with respect to the bead holding members 10 and 11.

  Next, as shown in FIG. 3, the front end side rotation shaft 3 is moved to the front end side of the rotation shaft 1 to move the bead holding members 10 and 11 away from each other, and the outer peripheral surfaces of the bead holding members 10 and 11 are moved. The inner side in the axial direction and the inner side in the radial direction of the inner unvulcanized tire GT of each bead part BE are supported by 10a, 11a and the protruding parts 10b, 11b, respectively. Further, the rods of the cylinders 23 and 32 are extended so that the projecting portions 20a and 30a of the contact members 20 and 30 are brought into contact with the bead portions BE of the inner unvulcanized tire GT. As a result, each bead portion BE is restricted from moving in the axial direction by the protruding portions 10 b and 11 b of the bead holding members 10 and 11 and the contact members 20 and 30. Further, the space closed by the bead holding members 10 and 11 and the inner unvulcanized tire GT becomes a sealed space.

  Next, as shown in FIG. 4, compressed air supplied from a compressor (not shown) is discharged from the communication pipe 2 a to inflate the inner unvulcanized tire GT, and the front end according to the expansion of the inner unvulcanized tire GT. The side rotary shaft 3 is moved to the base end side of the rotary shaft 1. At this time, the rod of the cylinder 32 is also extended in accordance with the movement of the distal end side rotation shaft 3, and the contact of the second contact member 30 with the bead part BE is maintained. In this way, the inner unvulcanized tire GT is formed in a toroidal shape, and the shape of the inner unvulcanized tire GT is adjusted while rotating the rotating shaft 1 in this state, and further, on the outer peripheral surface of the inner unvulcanized tire GT An outer unvulcanized tire composed of the belt member B, the tread member T, and the like is crimped. The first abutting member is rotatably supported on the tip side of the rod of each cylinder 23 and is in contact with the inner unvulcanized tire GT. The abutting member 20 rotates. Further, since the second contact member is rotatably supported on the tip end side of the rod of the cylinder 32 and is in contact with the inner unvulcanized tire GT, the second contact member is rotated with the rotation of the inner unvulcanized tire GT. The contact member 30 rotates.

  Further, when the unvulcanized tire is formed by changing the type of the inner diameter of the bead portion of the tire with the above-described unvulcanized tire molding machine, as shown in FIG. The second abutting members 20 and 30 are exchanged to those corresponding to the type of inner diameter of the bead portion of the tire by attaching and detaching each bolt 4. At this time, the inner diameters of the inner holes 10c and 20b of the bead holding member 10 and the first abutting member 20 are formed to be larger than the outer diameters from the front end side to the respective mounting portions on the rotary shaft 1. It is not necessary to remove parts other than the bead holding members 10 and 11 and the contact members 20 and 30.

  Thus, according to the unvulcanized tire molding machine of the present embodiment, each bead portion of the inner unvulcanized tire GT by the outer peripheral surfaces 10a and 11a and the projecting portions 10b and 11b of the pair of bead holding members 10 and 11. A first abutting member 20 that supports BE from the inner side in the axial direction and the inner side in the radial direction of the inner unvulcanized tire GT, and that arbitrarily moves in the axial direction of the rotary shaft 1 by each cylinder 23 fixed to the base 1a. And a second abutting member 30 that is arbitrarily moved in the axial direction of the rotary shaft 1 by the cylinder 32 fixed to the base 33, is not added to the inside of the bead portion BE supported by the bead holding members 10, 11. Since each of the protruding portions 10b and 11b and the contact members 20 and 30 are in contact with the outer side in the axial direction of the sulfur tire GT, the movement of the bead portion BE in the axial direction is restricted. When inflating the unvulcanized tire GT toroidally, without the bead portions BE comes off from the bead retaining members 10 and 11, it is possible to form a stable unvulcanized tire shape.

  In addition, since each contact member 20 and 30 is in contact with the bead portion BE of the inner unvulcanized tire GT from the outside in the axial direction, each bead portion BE is prevented from falling off from each bead holding member 10 and 11. It is not necessary to complicate the structure of each contact member 20, 30 and each bead holding member 10, 11, and depending on the type of inner diameter of the bead portion of the tire in the process of producing a plurality of types of tires, such as a trial production process, in small quantities. An increase in manufacturing cost of each bead holding member 10, 11 and each contact member 20, 30 to be replaced can be suppressed.

  Further, since each contact member 20, 30 is rotatably supported on the tip end side of the rod of each cylinder 23, 32, each contact member 20, 30 is contacted with the inner unvulcanized tire GT. When the inner unvulcanized tire GT is inflated and rotated to adjust the shape, the contact can be maintained.

  In addition, since each contact member 20, 30 is formed in a disk shape, each bead portion BE of the inner unvulcanized tire GT and each contact member 20, 30 are in contact over the entire circumference. Each bead part BE and the protruding parts 10b, 11b of each bead holding member 10, 11 can be brought into contact with each other over the entire circumference. Therefore, when the inner unvulcanized tire GT is expanded in a toroidal shape, it is possible to prevent the compressed air from leaking between the bead portions BE and the bead holding members 10 and 11.

  The bead holding members 10 and 11 and the first contact member 20 are supported on the rotating shaft 1 side as the first support member, and the second contact member 30 is the cylinder 32 as the second support member. Since the rotary shaft 1 and the cylinder 32 are arranged coaxially so that the tips thereof face each other, each bead holding member 10 supported by the rotary shaft 1 inside the cylindrical inner unvulcanized tire GT. 11 can be inserted, and the inner unvulcanized tire GT can be attached to each bead holding member 10, 11.

  Further, the inner diameter of the inner hole 20b of the first abutting member 20 is formed to be larger than the outer diameters of the distal end side rotating shaft 3, the flange portion 3a, the proximal end side rotating shaft 2 and the flange portion 2b, and bead holding Since the inner diameter of the inner hole 10c of the member 10 is formed to be larger than that of the distal end side rotation shaft 3 and the flange portion 3a, each bead holding member 10, 11 and each contact member 20, 30 are made to be the kind of inner diameter of the bead portion of the tire. Accordingly, it is not necessary to remove other parts when exchanging, and the exchanging work can be easily performed.

  In addition, it is possible to reduce the weight of the contact member 20 by providing the contact member 20 with a plurality of lightening holes 20c as shown in FIG. The contact member 30 can also be provided with a similar hole.

  In the present embodiment, the proximal-side rotary shaft 2 is fixed in the axial direction, and only the distal-end-side rotary shaft 3 is moved in the axial direction. It can also be moved in the axial direction. Thereby, it is also possible to shape | mold an unvulcanized tire, keeping the axial direction center position of each bead holding member 10 and 11 from moving.

Sectional drawing of the unvulcanized tire molding machine before mounting | wearing with the inner side unvulcanized tire which shows one Embodiment in this invention AA line sectional view in FIG. Sectional view of the unvulcanized tire molding machine after mounting the inner unvulcanized tire Sectional view of the unvulcanized tire molding machine with the inner unvulcanized tire expanded in a toroidal shape How to attach each bead holding member and each contact member to the unvulcanized tire molding machine Modification of AA line cross-sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 1a ... Base, 2 ... Base end side rotating shaft, 2a ... Communication pipe, 2b ... Flange part, 2c ... Connecting member, 3 ... Tip side rotating shaft, 3a ... Flange part, 4 ... Bolt, 10 ... Bead holding member, 10a ... outer peripheral surface, 10b ... protruding portion, 10c ... inner hole, 11 ... bead holding member, 11a ... outer peripheral surface, 11b ... protruding portion, 11c ... inner hole, 20 ... first contact member , 20a ... projecting portion, 20b ... inner hole, 21 ... boss, 21a ... flange portion, 21b ... bearing, 22 ... support member, 23 ... cylinder, 30 ... second contact member, 30a ... projecting portion, 30b ... inner hole, 31 ... boss, 31a ... flange part, 31b ... bearing, 32 ... cylinder, 33 ... base, 34 ... support member, GT ... inner unvulcanized tire.

Claims (5)

A pair of disk-shaped bead holding members for supporting each bead portion of the unvulcanized tire from the inner side in the axial direction and the inner side in the radial direction, and a supporting member for supporting each bead holding member coaxially, In an unvulcanized tire molding machine that expands a vulcanized tire in the radial direction and forms it in a toroidal shape,
A pair of contact members disposed coaxially with each bead holding member on both axial sides of the unvulcanized tire;
An unvulcanized tire molding machine comprising: a pair of moving mechanisms that support each contact member so as to be movable in the axial direction of the unvulcanized tire. The unvulcanized tire molding machine according to claim 1, wherein each contact member is rotatably provided in a circumferential direction of the unvulcanized tire. The unvulcanized tire molding machine according to claim 2, wherein each of the contact members is formed in a disc shape. The support member is composed of first and second support members arranged coaxially so that the ends thereof are opposed to each other,
Each bead holding member is disposed on the distal end side of the first support member, and one abutting member supported by one moving mechanism is disposed on the proximal end side of the first support member,
The unvulcanized tire molding machine according to claim 1, 2, or 3, wherein the other abutting member supported by the other moving mechanism is disposed at the tip of the second supporting member. Each bead holding member is detachably attached to the first support member, and one abutment member is detachably attached to one moving mechanism,
The one bead holding member and the one abutting member arranged on the base end side of the first support member are provided with insertion holes through which the first support member can be inserted to the respective attachment positions. Item 5. The unvulcanized tire molding machine according to Item 4.

Images