RESIN GEAR FOR ELECTRIC POWER STEERING SYSTEM AND ELECTRIC POWER STEERING SYSTEM COMPRISING SAME

摘要

Disclosed is a resin gear for electric power steering system having excellent mechanical strength and durability. Teeth of this resin gear are not damaged even when the gear is used for an electric power steering system comprising a high-power electric actuator. Specifically disclosed is a worm wheel (10) as a resin gear for electric power steering system, wherein a gear portion (16) is made of a resin molding material essentially containing a thermosetting resin and polyparaphenylenebenzobisoxazole fibers (PBO fibers).