Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
  • B29D2030/482—Applying fillers or apexes to bead cores

Definitions

• the present invention relates to a method for manufacturing a tire bead, and more particularly, to a method for manufacturing a tire bead capable of accurately attaching a bead filler to a bead core.
• a tire bead is used for a bead portion of a tire.
• the tire bead includes a wire core formed by bundling bead wires and forming a ring, and a bead filer made of hard rubber or the like, and has a rectangular cross section.
• a bead filler with a substantially triangular cross section is affixed annularly to the outer peripheral surface of the bead core.
• this tire bead is manufactured by arranging a bead filer 11 having a triangular cross section in a cylindrical shape on a side surface 12a of a ring-shaped bead core 12 and forming a bladder. Pressurized fluid is supplied to 13 from the direction of arrow a to expand the bladder 13 and raise the bead filer 11 in the direction of arrow b, as shown in Fig. 8.
• the bottom surface 11a of the core 11 was attached to the outer peripheral surface 12b of the bead core 12 (JP-A-53-128682). However, a cylindrical shape was formed on the side surface 12a of the bead core 12.
• the applicant of the present application has proposed a bead filler 11 having a shape in which a thin projection 11 B is integrally formed on the bottom 11 A in advance as shown in FIG. (Japanese Patent Application Laid-Open No. 62-46634).
• the thin protrusion 11 B projecting from the bottom 11 A of the bead filler 11 is cylindrically wound while being adhered to the outer peripheral surface 12 b of the bead core 12.
• the cut part is joined to the first wound end, and then the bead filler 11 is bladder 13 As a result, the bead filer 11 rises from the folded portion X, and the bottom surface 11a of the bead filler 11 is bonded to the upper surface of the thin projection 11B to form a disk.
• an object of the present invention is to provide a method for manufacturing a bead in which the bead filler can be stuck to the bead core with high accuracy by erecting the bead filler substantially perpendicular to the bead core. It is in.
• a method of manufacturing a tire bead of the present invention that achieves the above object is as follows: a bead filler made of unvulcanized rubber is provided by: a filler main body having a slanted taper surface at a bottom part; From the above, the two taper surfaces are formed into a shape integrally connected so as to form a V shape, and the projection of the bead filler is attached to the outer periphery of a ring-shaped bead core, and the entire periphery of the bead core is formed.
• the filler body is erected so as to be cylindrical, and then the filler body is erected with a connecting portion between the filler body and the projection as a fulcrum, and the taper surface of the filler body is attached to the projection.
• the filler body is adhered to the taper surface, and the filler body is erected substantially perpendicularly to the outer peripheral surface of the bead core.
• the bead filler is folded back on the side of the bead core.
• a roller with a taper is used as a guide at the connection part of the bead filler to make the ends coincide with the circumference.
• the bead filer can be erected substantially vertically with respect to the bead core and stuck with high accuracy, thereby improving the product accuracy of the tire bead. I can do it.
• by applying a tapered roller to the connecting portion between the filler body and the projection the side of the bead core and the folded end of the bead filler can be made to coincide with each other. Can further increase the accuracy of pasting.
• FIG. 1 is an enlarged perspective view showing a part of a bead filler used in the manufacturing method of the present invention in a cutaway manner.
• FIG. 2 to FIG. 6 are explanatory views showing the manufacturing steps of the present invention.
• the bead filler 11 used in the present invention is a 1, as shown in FIG. 1, a band-shaped filler body 1A made of unvulcanized rubber and having a substantially triangular cross section and a projection 1B are provided.
• the protruding portions 1B are integrally connected to the bottom 1a of the filler body 1A by a connecting portion Y so as to be aligned on the same plane along the longitudinal direction.
• the bottom la of the filer 1A and the surface of the protrusion 1B are formed with slanted taper surfaces 1b and 1c, respectively. They face each other to form a V-shape.
• the maximum thickness r of the projection 1B and the maximum thickness s of the filler body 1A are larger than the thickness t of the connecting portion Y.
• the connecting portion Y is turned back, a wedge effect occurs at the connecting portion Y, so that stress concentrates on this portion, and the filer main body 1A is erected by a bladder described later to form a tapered surface.
• the reaction force generated in the folded-up connecting portion Y is small, and the bead filer 11 can be stably erected.
• the taper surface 1b of the filler body 1A and the protrusion are required. It is necessary that the length H of the taper surface 1 c of 1 B be the same as the length H.
• Fig. 2 is a schematic diagram showing the main part of the tire bead manufacturing device in a half section with respect to the center line C, and 5 is a bead.
• a bead clamp ring for clamping the core 3 6 is a sabot ring for attaching the bead filler 1 to the bead core 3
• 7 is expanded by the pressurized fluid to raise the filler body 1 A of the bead filler 1.
• a bladder 8 is a pusher ring for pressing the inflated bladder 7. Each part can be moved in the direction of the arrow.
• the bead filler Wrap it in a cylindrical shape while attaching the bottom 1 d of the projection 1 B of the first one.
• the bead filer 11 may be wound by guiding the connecting portion Y of the bead filer 11 while contacting the roller 4 with a taper. Thereby, the folded end of the bead filler 1 can be uniformly wound on the outer peripheral surface 3 a of the bead core 3.
• the end of the wound bead filer 1 is cut, and the end surface of the cut portion and the end surface of the first wound end portion are bonded so as to be crimped, and the bead filer 1 for the bead core 3 is cut. Is completed.
• the bead filler 1 is wound around the bead core 3 in a cylindrical shape, It comes into close contact with the outer peripheral surface 3a and is completely bonded.
• the filler body 1A of the bead filer 11 is turned up from the connecting portion Y and rises.
• the filler body 1A is further raised so as to be substantially perpendicular to the bead core 3 while pressing the bladder 17 with the bushing ring 8, and the bead core is also raised.
• the taper surface lb of the filler body 1 A is projected to the taper surface 1 B of the filler body 1 A. It is to adhere firmly to c.
• the bead filer 1 can be stuck to the bead core 3 with high accuracy by sticking the bead filer 1 upright and substantially perpendicular to the bead core 3. .
• the folding angle of the filler body 1 depends on the angle of inclination between the tapered surface 1b of the filler body 1A and the tapered surface 1c of the projection 1B, but it is 90 degrees to 12 with respect to the horizontal. It is preferable to set the range to 0 degrees.
• the support ring 6 has a support surface 6 a having an angle corresponding to the turning angle of the filler body 1.
• the bead filler is formed in advance as a connection forming body between a filler main body having a tapered surface facing each other and a projection, and the bead filler is formed.
• the filler body is raised with the connecting part as a fulcrum, so that the bead filler is raised almost perpendicularly to the bead core and the accuracy is improved. Can be stuck well.
• a tire bead comprising a bead core and a bead filler used in a bead portion of a tire of an automobile or the like. — It can be used very effectively in manufacturing

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tyre Moulding (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=18518106

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (3)

Citations (3)

• 1990
  • 1990-12-28 JP JP2408685A patent/JP3066769B2/ja not_active Expired - Lifetime
• 1991
  • 1991-12-25 WO PCT/JP1991/001760 patent/WO1992012002A1/ja active Application Filing
  • 1991-12-25 KR KR1019920702056A patent/KR0170751B1/ko not_active Expired - Fee Related
  • 1991-12-25 DE DE19914193389 patent/DE4193389T1/de not_active Withdrawn

Patent Citations (3)

Also Published As

Similar Documents

Legal Events