Patent ID: 7316255
Filing Date: 2008-01-08
Classification: B29D,B60C,Y10T

Abstract:
1. A pneumatic fire comprising a tread portion, a pair of sidewall portions, a pair of bead portions each with a bead core therein, a carcass ply extending between the bead portions through the tread portion and sidewall portions, and turned up around the bead core in each of the bead portions 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 disposed between each said turnup portion and said main portion, and a reinforcing rubber layer disposed axially outside said carcass ply, wherein said 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, said reinforcing rubber layer has a thickness in a range of from 0.5 to 1.5 mm and extends radially outwardly beyond the maximum tire section width point, and radially inwardly beyond the radially outer edge of the turnup portion so that the reinforcing rubber layer is positioned axially outside of the turnup portion and the radially outer end of the reinforcing rubber layer is positioned at a radial height of from 5 to 15 mm from the maximum tire section width point, and the bead apex and reinforcing rubber layer are each made of a hard rubber, and the difference in JIS type-A hardness therebetween is not more than 15 degrees.