| 摘要 |
PURPOSE:To increase torque, to reduce a frictional sound and to lengthen durability by giving a contact section in a body brought into pressure-contact with an elastic vibrator hardness formed to a stepped or gradient shape in the depth direction or in these combination. CONSTITUTION:A sliding body 22 is brought into pressure-contact with an elastic vibrator 24 with a piezoelectric vibrator 25 through a frictional material 23. The frictional material 23 has harness shaped to a stepped or gradient shape in the depth direction or in these combination. Elastic waves are induced on the elastic vibrator 24 by driving the piezoelectric vibrator 25, and the sliding body 22 is turned through the frictional material 23 brought into pressure-contact with the elastic vibrator 24. |
