| 摘要 |
<p>The electromotive adjustable resistor of present invention comprising, a first worm gear fixed on the motor shaft of the electric motor, a first gear shaft having a first worm wheel and a first cylindrical gear fixed on it, said first worm wheel engaging with the first worm gear, a second gear shaft having a second cylindrical gear and a second worm gear fixed on it, said second cylindrical gear engaging with the first cylindrical gear, an adjustable resistor having a resistance adjusting shaft, a second worm wheel assembled concentrically around the adjusting shaft of the adjustable resistor, said second worm wheel engaging with the second worm gear, means which transmit the rotational torque of the second worm wheel to the resistance adjusting shaft of the adjustable resistor. That is, the gear train of the electromotive adjustable resistor of the present invention comprises two worm gear engagements and a sylindrical gear engagement. A sylindrical gear engagement makes the space between the resistance adjusting shaft and the motor shaft along the axis of the both shafts. So that the axis of the both shafts can be coinside or nearly coinside with, in compliance with the design request, without interference between them. This makes the width W of the electromotive adjustable resistor smaller, and makes the space on the circuit board occupied by it also smaller compared with the conventional type which is not able to coinside the axis of the both shafts. <IMAGE></p> |
