Electric power steering device

摘要

In an electric power steering device (1), the rotation of an electric actuator (8) for generating auxiliary steering power is transmitted to a vehicle wheel (6) by way of a worm (9) and a worm wheel (10). The worm wheel (10) is molded from a synthetic resin material. The relative viscosity (VR) of the molded worm wheel (10) is made greater than or equal to 100 and less than or equal to 300.