Patent ID: 6470764
Filing Date: 2002-10-29
Classification: F16H,Y10T

Abstract:
An electric driving device for a transmission which is characterized in that:a selecting operation for displacing a shift shaft in the axial direction so as to select a desirable gear out of a plurality of gears and a shifting operation for rotating said shift shaft so as to bring the selected gear into a meshing state are performed by a first and second actuators respectively employing electric motors as the driving sources thereof; the first actuator for performing said selecting operation comprises a first electric motor, a worm gear to be driven to rotate by an output shaft of this first electric motor, a worm wheel to be meshed with this worm gear, and a rocking arm for rotating together with this worm wheel, the tip end of this rocking arm being engaged with a part of said shift shaft to allow this shift shaft to be displaceable in the axial direction upon rocking of this rocking arm; the second actuator for performing said shifting operation comprises a second electric motor, and a ball screw mechanism equipped with an output shaft member to be driven to rotate by an output shaft of this second electric motor for issuing an output converted into a rectilinear motion; and the tip end of this output shaft member is coupled to the tip end of a driving arm for rotating said shift shaft so that said driving arm is rotated by the rectilinear motion of said output member to rotate said shift shaft, thereby performing said shifting operation.