THERMOPLASTIC RESIN GEAR, INJECTION MOLDING DIE FOR MANUFACTURING GEAR AND METHOD OF MANUFACTURING THERMOPLASTIC RESIN GEAR

摘要

PROBLEM TO BE SOLVED: To provide a thermoplastic resin gear superior in dimensional accuracy, rigidity and slidableness, an injection molding die for manufacturing the gear and an efficient manufacturing method for the thermoplastic resin gear. SOLUTION: The first invention is this thermoplastic resin gear composed of a disk part a and a gear part b for constituting an outer peripheral part of the disk part a, and the disk part a is composed of a noncrystalline thermoplastic resin or a thermoplastic resin including an inorganic filler A, and the gear part b is composed of a thermoplastic resin B having a larger molding shrinkage factor, a smaller elastic modulus and superior slidableness than the thermoplastic resin A. The second invention relates to an injection molding die for manufacturing the thermoplastic resin gear. The third invention relates to this manufacturing method of the thermoplastic resin gear.