Piezo actuator

US6781289B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rudolf Heinz · Renningen, DE
• Alexander Hedrich · Stuttgart, DE
• Friedrich Boecking · Stuttgart, DE

Key dates

• Filing date: May 9, 2003
• Grant date: Aug 24, 2004
• Expiry date: May 9, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/26

Abstract

A piezoelectric actuator in which a piezoelectric element is present for subjecting an actuating element to a tensile or compressive stress. A sleeve is secured to a foot part, to which the piezoelectric element is secured and by way of which the piezoelectric element is kept centered in a housing under mechanical prestressing, and this sleeve surrounds the piezoelectric element in such a way as to stabilize it mechanically, at least in partial regions that are electrically insulated from the piezoelectric element. Between the sleeve and the piezoelectric element, a heat-conducting elastomer is placed, and the sleeve comprises a heat-conducting material that is deformable within predetermined limits.