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US 6,264,780 B1Granted
Method of manufacturing bead filler and apparatus for forming filler portion
AssigneeBridgestone Corporation
InventorsNoriyuki Iwanaga, Takashi Senbokuya
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AssigneeBridgestone Corporation
InventorsNoriyuki Iwanaga, Takashi Senbokuya
Estimating the term…
A method and an apparatus for manufacturing a bead filler which does not deteriorate the uniformity of a pneumatic tire are provided. The apparatus extrudes a rubber composition at a surface velocity V1 in a top portion 28 and at a surface velocity V2 in a base portion 26, while forming the rubber composition in the shape of a filler portion 24 in a forming portion 40 by a truncated cone shaped extruding roller 38. The filler portion 24 formed in a curved shape similar to a shape of a side portion of a tire is formed due to the difference in velocity between the surface velocities V1 and V2. The filler portion 24 is successively joined to and wound around an annular bead core from a winding start end, and is disposed in the side portion of the tire after forming the bead filler.
A method of manufacturing a filler portion of the bead filler for a pneumatic tire comprising the steps of:
A method of manufacturing a filler portion of the bead filler for a pneumatic tire comprising the steps of extruding a rubber composition into a specific cross-sectional shape and, simultaneously during the step of extruding curving it into a curved filler portion corresponding to a shape of the side portion of said pneumatic tire by using a pair of rollers having respective axes of rotation not parallel to each other, said rollers forming an extrusion opening having a cross-sectional shape of said filler portion, one of said rollers having different surface velocities at both ends in the extrusion width direction of said filler portion to curve the extrusion, and subsequently joining said curved filler portion with a bead core.
Dependencies are inferred from the claim text.