| 摘要 |
PURPOSE:To obtain a high output through full utilization of torsional displacement by bringing a radially expandable vibrator into direct contact with a face of a torsional vibrator in which maximum torsional displacement occurs, and bringing a rotor into pressure contact with the combined output end section of the radially expandable vibrator. CONSTITUTION:A ultrasonic motor comprises a resonance body A where a torsional vibrator 1 is coupled integrally through a coupling shaft 3 with a longitudinal vibrator 2 opposedly arranged to one face in which maximum torsional displacement takes place. A rotor 11 is arranged rotatably at the other end of the coupling shaft 3 through a bearing 12, and the leading end face 17 of the rotor 11 is brought into pressure contact with the combined output end section (face) 13 of the radially expandable vibrator 2 by means of a pressure spring 14. The combined output end section 13 is tapered with an angle of about 45 deg. with respect to the axis of the coupling shaft 3. By such arrangement, friction between the combined output end section 13 and the leading end face 17 of the rotor 11 increases thus transmitting rotary torque positively to the rotor 11. |
