Piezoelectric actuator
AssigneeRobert Bosch GmbH
InventorsWolfgang Stoecklein, Friedrich Boecking
Life of this patent
Estimating the term…
Abstract
A piezoelectric actuator for actuating a mechanical component includes a piezoelectric element, for subjecting an actuating element to a tensile force or compressive force, and a compensating element, with the piezoelectric element and the compensating element having essentially the same coefficients of temperature expansion. The compensating element is mechanically coupled to the piezoelectric element in such a way that the temperature-caused expansions of the piezoelectric element and of the compensating element cancel one another out in the effective direction in such a way that the actuating element remains in its position.
Claims16
A piezoelectric actuator, comprising
- a 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).
Dependencies are inferred from the claim text.