Patent ID: 8253304

Claim:
Ultrasonic linear drive, comprising a driving element ( 1 ) as ultrasonic oscillator ( 2 ) with two generators ( 3 , 4 ) for ultrasonic oscillations, and a driven element ( 5 ) which produces a frictional contact with the driving element ( 1 ), and an electrical excitation source ( 12 ) for the driving element ( 1 ), characterized in that the ultrasonic oscillator ( 2 ) is configured as a hollow thin-walled piezoelectric cylinder, the height H of which is equal to or smaller than the mean diameter D thereof, and the generators ( 3 , 4 ) for ultrasonic oscillations are symmetrically disposed on both sides relative to the sectional plane S which extends through the center of the height of the ultrasonic oscillator ( 2 ) perpendicular to the center line L thereof, wherein the cylinder surface of the driving element ( 1 ) is in contact with the driven element ( 5 ) and the electrical excitation source ( 12 ) is connected to the ultrasonic linear drive to excite only the first or the second generator ( 3 , 4 ) for ultrasonic oscillations.