| 摘要 |
PURPOSE:To improve durability, by setting the hardness of the butted section of the object of a frictional member or the like made to come in pressure contact with an elastic oscillator, in a specified range. CONSTITUTION:A rotary type ultrasonic wave motor is composed of a sliding unit 22 integrated with a shaft 21, a frictional member 23 fitted integrally on the sliding unit, an elastic oscillator 24, a piezoelectric transducer 25 fitted on the oscillator 24, an absorber 26, a fitting stand 31, and the like. By the frictional member 23, a butted section between the elastic oscillator 24 and the sliding unit 22 made to come in pressure contact with the oscillator 24 is organized, and the member 23 is set to be of M type with Rockwell hardness provided in JIS-K-7202, 20 or more and 80 or less, and of A type with Shore hardness, 40 or more, and the member of A type with Shore hardness exceeding 90 is formed with the rubber of NR, SBR, or the like of D type with Shore hardness, 20 or more and 70 or less. Then, the ultrasonic wave motor of increased torque and rotational frequency and of reduced noise can be obtained. |
