Patent ID: 8375921
Filing Date: 2013-02-19
Classification: F02D,G01D

Abstract:
1. A motor-driven throttle valve device with an inductive throttle sensor, comprising: a throttle body which has an intake path; a throttle shaft which extends through the intake path in a direction intersecting the flow of air; a butterfly throttle valve which is fastened to the throttle shaft to open and close the intake path; a motor which drives the throttle shaft; a train of reduction gears which transmits the rotation of the motor to the throttle shaft and includes an output gear fastened to a rotor shaft of the motor, a final stage gear fastened to the throttle shaft, and an intermediate gear positioned between the output gear and the final stage gear; an excitation conductor which is mounted on the throttle shaft; a gear cover which is mounted on the throttle body to cover the reduction gear train; a circuit board which is mounted on the gear cover; a receiver coil/exciting coil section which includes a receiver coil and an exciting coil and is mounted on the circuit board; a sensor circuit which is mounted on the circuit board to detect a change in the inductance between the excitation conductor and the receiver coil and determine the rotation angle of the throttle shaft; a retainer which is positioned between the gear-side surface of the gear cover and an end face of the intermediate gear to prevent the axial separation of the intermediate gear; a motor terminal connection which is mounted on the gear-side surface of the gear cover and electrically connected to a motor terminal projecting from the motor; a connector which is mounted on the gear cover and connected to an external wiring plug; a plurality of connector terminals including a motor connector terminal which is connected to the motor terminal connection electrically, a sensor first connector terminal which is connected to the sensor circuit electrically, and a sensor second connector terminal which is connected to the sensor circuit electrically; a sensor first connection conductor section which connects the sensor circuit and the sensor first connector terminal; and a sensor second connection conductor section which connects the sensor circuit and the sensor second connector terminal; wherein a part of the sensor first connection conductor and a part of the sensor second connection conductor are embedded into the gear cover; wherein the retainer is arranged between an exposed portion of the sensor first connection conductor and an exposed portion of the sensor second connection conductor; wherein the circuit board is arranged so that a shorter side of the circuit board is parallel to an arranging direction of the exposed portion of the sensor first connection conductor, the retainer and the exposed portion of the sensor second connection conductor; wherein the motor terminal connection is arranged at the opposite side to the circuit board via the retainer; wherein the sensor first connection conductor is prolonged in the side of motor terminal connection through one side of the retainer; and wherein the sensor second connection conductor is prolonged in the side of motor terminal connection through the other side of the retainer.