Sumitomo Rubber Industries Limited

Kazuo Sato

Kazuhiko Kawamura

Satoru Kokubu

Susumu Suga

Kazuaki Kondo

Susumu Ito

Process and apparatus for building a green tire

A radial tire for heavy loads, comprises: a pair of bead cores; a carcass the ends of which are turned up around the bead cores to form a carcass main part and a carcass turned up part on the axially inside and the outside of the bead core, respectively; a metallic cord reinforcing layer turned up around the bead core to form (a) an outside part extending along the axially outside of the carcass turned up part and (b) an inside part extending along the axially inside of the carcass main part; an outside reinforcing layer of organic fiber cords disposed axially outside the outside part of the metallic cord reinforcing layer; an inside reinforcing layer of organic fiber cords disposed on the axially inside of the carcass main part; a bead apex between the carcass main part and the turned up part extending radially outwardly beyond the radially outer end of the outside reinforcing layer; a rubber chafer disposed outside the outside reinforcing layer; and an inner sidewall disposed between the outside reinforcing layer and the rubber chafer extending radially outwardly beyond the radially outer end of the outside reinforcing layer so as to contact with a buffer of the bead apex.

Reinforcing structure for bead portion of radial tire for heavy load

In manufacture of an automobile tire, a method and a device for making a bead apex/bead ring assembly. More particularly, a method and a device for automatically applying an extruded belt-like rubber material generally referred to as 'bead apex' or 'bead filler' onto a core material referred to as 'bead ring' which is previously mounted on a circular holding device referred to as 'former' to make a bead ring/bead apex assembly. In the proposed method and device, the 'apex' is drawn out from an extruder or a roll and fed to the 'bead ring' and, then it is wound around and bonded to the outer periphery of the 'bead ring' with rotation of the 'former', and at least the leading end of the apex is caught and restrained by a holding device during at least a period from the start to the end of the apex applying process.

Bead appex applying method and device

Growing community of inventors

Kobe, Japan

Kazuo Sato