Patent ID: 8985265
Filing Date: 2015-03-24
Classification: B62D

Abstract:
1. An electric power steering apparatus, comprising: an electric motor rotatable in response to steering operation; a drive torque transmission mechanism for converting a rotation of the electric motor to a linear movement and transmitting the linear movement to vehicle wheels for steering of the vehicle wheels; a first circuit board mounting thereon a processing element to process a control command for rotation control of the electric motor; a second circuit board mounting thereon a driving element to drive the electric motor based on the control command from the first circuit board; a metal control housing accommodating therein the first and second circuit boards and coupled at an outer surface thereof to the drive torque transmission mechanism; a heat transfer part located inside the metal control housing such that heat is transferred from the respective first and second circuit boards to the heat transfer part; and a heat guide part extending through the outer surface of the metal control housing to the inside of the heat transfer part so as to guide the heat transferred to the heat transfer part in a direction toward the drive torque transmission mechanism.