Patent ID: 7658523

Claim:
A device for adjusting an optical axis of a headlight of a vehicle, the device comprising: a housing unit that includes an arm; a motor that is arranged in the housing unit; a worm wheel that is threadably mounted on the housing; a rod that is rotatably arranged inside the worm wheel; a shaft that is configured to move back and forth with respect to the housing unit and is rotatably arranged inside the rod; a crown gear having a chamfered groove engaging with a chamfered portion of the shaft; a driving-force transmitting mechanism that is arranged between the motor and the shaft, and that transmits a driving force of the motor to the shaft; and a plurality of terminals for supplying an electric power to the motor, wherein the rod includes a ring-shaped pressing portion and a protrusion portion on an outer surface thereof; the worm wheel is arranged between the ring-shaped pressing portion and the protrusion portion to transmit an axial movement to the rod; the protrusion portion of the rod is fitted into the arm of the housing so that the rod withholds from a rotation of the worm wheel; the shaft includes a ring-shaped groove to engage with a ring-shaped convex portion of the rod; an axial direction of an output shaft of the motor is perpendicular or substantially perpendicular to an axial direction of the shaft, and a shape of a layout of the terminals is substantially symmetric with respect to a vertical line passing through a center of the shaft.