Piezo actuator with improved electrical contacting and employment of such a piezo actuator

US6307306A · kind A · utility

Assignees

• Siemens Aktiengesellschaft · DE
• Siemens Matsushita Components GmbH & Co. KG · DE

Inventors

• Ulrich Bast · Birkenfeld, DE
• Dieter Cramer · Graz, AT
• Gerald Kainz · Graz, AT
• Carsten Schuh · Baldham, DE
• Andreas Wolff · Munich, DE
• Karl Lubitz · Ottobrunn, DE

Key dates

• Filing date: Aug 6, 1999
• Grant date: Oct 23, 2001
• Expiry date: Aug 6, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/875

Abstract

A piezo actuator (1) is disclosed that has a contact lug (20, 21) for the electrical contacting of an electrode (14, 15) of an actuator member (11). Due to an expansion and contraction of the actuator member, a mechanical stress occurs in the contact lug that is minimized in that the contact lug has a device for adapting the expanse to a dimension of the expansion and contraction. The device is, for example, a deformation material in the form of a wire weave. The piezo actuator is utilized for the drive of an injection valve in an internal combustion engine.