Pneumatic tire and method for manufacturing the same

A pneumatic tire comprising:

• a pair of bead portions;
• a pair of bead cores each disposed in a respective one of the pair of bead portions;
• a carcass extending between the pair of bead cores, the carcass comprising a carcass ply that comprises a main portion extending between the pair of bead cores and a pair of turn-up portions each turned up around a respective one of the pair of bead cores from axially inside to outside of the tire and extending outwardly in a tire radial direction to a radially outer end thereof;
• and
• a reinforcing rubber layer disposed in each bead portion and being adjacent to an axially outside of a respective one of the pair of turn-up portions, wherein
• the reinforcing rubber layer has a laminated body in which a plurality of sheet-shaped rubber members having different radial lengths are laminated in the tire axial direction,
• the reinforcing rubber layer comprises a maximum thickness portion having a part where the plurality of sheet-shaped rubber members is laminated and a minimum thickness portion where the plurality of sheet-shaped rubber members is not laminated,
• a difference (Ta−Tb) between a thickness Ta of the maximum thickness portion and a thickness Tb of the minimum thickness portion is equal to or more than 1 mm,
• the minimum thickness portion forms an outer end portion in the tire radial direction of the reinforcing rubber layer,
• the outer end portion has a length in the tire radial direction equal to or more than 3 mm,
• a radially outermost end of the reinforcing rubber layer is located radially inwardly of a radially outermost end of the turn-up portions,
• the plurality of sheet-shaped rubber members are rubber sheet members in which cords are not embedded, and
• each sheet-shaped rubber member has a maximum thickness equal to or less than 2.0 mm.

A pneumatic tire comprising:

• a pair of bead portions;
• a pair of bead cores each disposed in a respective one of the pair of bead portions;
• a carcass extending between the pair of bead cores, the carcass comprising a carcass ply that comprises a main portion extending between the pair of bead cores and a pair of turn-up portions each turned up around a respective one of the pair of bead cores from axially inside to outside of the tire and extending outwardly in a tire radial direction;
• a bead apex rubber extending outwardly in the tire radial direction from the bead core to a radially outermost end thereof in each bead portion;
• and
• a reinforcing rubber layer disposed in each bead portion and being adjacent to an axially outside of a respective one of the pair of turn-up portions, wherein
• the reinforcing rubber layer has a laminated body in which a plurality of sheet-shaped rubber members having different radial lengths are laminated in the tire axial direction,
• the reinforcing rubber layer comprises a maximum thickness portion having a part where the plurality of sheet-shaped rubber members is laminated and a minimum thickness portion where the plurality of sheet-shaped rubber members is not laminated,
• a difference (Ta−Tb) between a thickness Ta of the maximum thickness portion and a thickness Tb of the minimum thickness portion is equal to or more than 1 mm,
• the minimum thickness portion forms an outer end portion in the tire radial direction of the reinforcing rubber layer,
• the outer end portion has a length in the tire radial direction equal to or more than 3 mm,
• the radially outermost end in the tire radial direction of the bead apex rubber is positioned within a region of the maximum thickness portion in the tire radial direction,
• the plurality of sheet-shaped rubber members are rubber sheet members in which cords are not embedded, and
• each sheet-shaped rubber member has a maximum thickness equal to or less than 2.0 mm.