Title:
空気入りタイヤ及びその製造方法
Document Type and Number:
Japanese Patent JP4464700
Kind Code:
B2
Abstract:
A pneumatic tire (1) comprises: a carcass ply (6) turned up around a bead core (5) in each bead portion from the inside to the outside of the tire so as to form a pair of turnup portions and a main portion therebetween; a bead apex (8) disposed between the carcass ply turnup portion and main portion; and a reinforcing rubber layer (10) disposed axially outside the carcass ply, wherein the bead apex extends radially outwardly from the bead core up to a position at a radial height in a range of from 10 to 25 mm from the radially outer end of the bead core; the reinforcing rubber layer extends radially outwardly beyond the maximum tire section width point, and radially inwardly beyond the radially outer edge of the turnup portion; and the bead apex and reinforcing rubber layer are each made of a hard rubber, and the difference in hardness therebetween is not more than 15 degrees. In a method of manufacturing the pneumatic tire, a bead-core-and-apex assembly is placed on each sides of a cylindrical surface of a tire-building drum (20) around which a carcass ply (6A) is wound, wherein the radially outer end of a bead apex rubber of the assembly is positioned at a radial distance of not more than 8 mm from the cylindrical surface.
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Inventors:
Yoshinori Nakagawa
Application Number:
JP2004020224A
Publication Date:
May 19, 2010
Filing Date:
January 28, 2004
Export Citation:
Assignee:
Sumitomo Rubber Industries, Ltd.
International Classes:
B60C15/06; B29D30/24; B29D30/30; B29D30/32; B29D30/72; B60C13/00; B60C15/04
Domestic Patent References:
| JP2001071715A | ||||
| JP7285305A | ||||
| JP11020424A |
Attorney, Agent or Firm:
Sumitomo Shintaro