Patent ID: 6784599
Filing Date: 2004-08-31
Classification: F02M,H01L

Abstract:
A piezoelectric actuator, comprisinga piezoelectric element (2) for subjecting an actuating element (9) to a tensile force or compressive force, and a compensating element (3;20), the piezoelectric element (2) and the compensating element (3;20) having essentially the same coefficients of temperature expansion, wherein, the piezoelectric element (2) in its effective direction resting with one end against a fixation edge of a housing (6) via a spring (4) and with its other end on another fixation edge of the housing (6) via a pressure plate (8) and a prestressing spring (7), and a spring plate (5), which is disposed between the piezoelectric element (2) and the spring (4) and on which the compensating element (3;20) is additionally disposed, which with its other end abuts the housing (6) firmly and is located essentially parallel to the piezoelectric element (2), the piezoelectric element (2) and the compensating element (3;20) being hollow cylinders, which are disposed about the axis of the actuating element (9), and wherein the piezoelectric actuator further comprises a heat-conducting paste disposed between the piezoelectric element (2) and the compensating element (3;20).