Actuator

US6685113B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Ruehle · Ditzingen, DE
• Hubert Stier · Asperg, DE
• Matthias Boee · Ludwigsburg, DE
• Guenther Hohl · Stuttgart, DE
• Norbert Keim · Besigheim, DE

Key dates

• Filing date: Sep 26, 2001
• Grant date: Feb 3, 2004
• Expiry date: Sep 26, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/26
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An actuator (1), in particular for operation of fuel injectors in fuel injection systems of internal combustion engines, has in this embodiment a plurality of layers (2) of a piezoelectric or magnetostrictive material arranged in a stack. The actuator (1) is prestressed by a tie rod (6) arranged in a central recess (5) by way of opposing threads (7 and 8). Securing the device and the transfer of force are accomplished by a cover plate (3) and a bottom plate (4). The prestress can also be created by a sheathing (9) surrounding the actuator (1), which transfers an axial force component onto the layers (2) via the cover plate (3) and the bottom plate (4) by flanging of projecting ends (10).