Arrangement with a coated piezoelectric actuator

US7990023B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Albano De Paoli · Rochlitz, DE
• Stefan Schuerg · Ludwigsburg, DE
• Wolfgang Stoecklein · Stuttgart, DE
• Holger Rapp · Hemmingen, DE
• Thomas Pauer · Freiberg, DE
• Friedrich Boecking · Stuttgart, DE
• Marco Holst · Schönberg (Holstein), DE
• Helmut Sommariva · Graz, AT
• Claudia Klotz · Bamberg, DE
• Peter Cromme · Bamberg, DE

Key dates

• Filing date: May 22, 2007
• Grant date: Aug 2, 2011
• Expiry date: Jan 22, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/42
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An arrangement is proposed for forming a piezoelectric actuator, which has at least one piezoelectric element that in each case consists of a multi-layer structure of piezoelectric-layers, wherein internal electrodes arranged between the piezoelectric-layers in the direction of the build-up of the layers of the piezoelectric element, have an electrical voltage of different polarity alternately applied to them. Around the piezoelectric element, or in the case of multiple piezoelectric elements positioned in series in the activation direction, around the piezoelectric elements, and at least partially around the actuator head and the actuator foot there is arranged a covering system made from at least one layer of an insulating material. The at least one layer encloses the joints between the piezoelectric element or elements and the actuator head and the actuator foot, forming a seal.