Pneumatic tires, tire vulcanization dies, and vent plugs used in tire vulcanization dies

摘要

PROBLEM TO BE SOLVED: To suppress clogging of a tire vulcanization mold and improve the aesthetic appearance of a pneumatic tire. SOLUTION: A pneumatic tire 1 has a recess 7 recessed inward from an outer surface 2c of a tread 2, a protrusion 5 protruding from the bottom of the recess 7, and a reinforcing portion 6 for reinforcing a base 5a of the protrusion 5. And. The tire vulcanization die 10 has a mold 14 having a molding surface 15 for molding the outer surface 2c of the tread 2, a vent hole 20 formed in the mold 14, and a cylinder arranged on the molding surface 15 side of the vent hole 20. It is provided with a shaped vent plug 25. The vent plug 25 has a convex portion 25d protruding from the molding surface 15 into the cavity of the mold 14, and an expansion portion 25g provided in the convex portion 25d so as to expand a part of the exhaust hole 25a. [Selection diagram] Fig. 2