Ultrasonic linear drive unit comprising a hollow cylindrical oscillator
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United States of America Patent
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Aug 28, 2012
Grant Date -
Jan 27, 2011
app pub date -
Nov 3, 2008
filing date -
Nov 8, 2007
priority date (Note) -
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Abstract
The invention relates to an ultrasonic linear drive unit comprising a driving element as an ultrasonic oscillator with two generators for ultrasonic vibrations and a driven element that forms a frictional contact with the driving element, and an electrical excitation source for the driving element. According to the invention, the ultrasonic oscillator is designed as a hollow thin-walled piezoelectric cylinder, the height H of which is identical to or smaller than the mean diameter D thereof. The generators for ultrasonic vibrations are symmetrically disposed on both sides relative to the sectional plane S that extends through the center of the height of the ultrasonic oscillator, perpendicular to the longitudinal axis L thereof. The cylinder surface of the driving element is in contact with the driven element, and the electrical excitation source is connected to the ultrasonic linear drive unit in such a way that the drive unit excites only the first or the second generator for ultrasonic vibrations.
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