The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2004
Filed:
Sep. 26, 2001
Wolfgang Ruehle, Ditzingen, DE;
Hubert Stier, Asperg, DE;
Matthias Boee, Ludwigsburg, DE;
Guenther Hohl, Stuttgart, DE;
Norbert Keim, Loechgau, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An actuator ( ), in particular for operation of fuel injectors in fuel injection systems of internal combustion engines, has in this embodiment a plurality of layers ( ) of a piezoelectric or magnetostrictive material arranged in a stack. The actuator ( ) is prestressed by a tie rod ( ) arranged in a central recess ( ) by way of opposing threads ( and ). Securing the device and the transfer of force are accomplished by a cover plate ( ) and a bottom plate ( ). The prestress can also be created by a sheathing ( ) surrounding the actuator ( ), which transfers an axial force component onto the layers ( ) via the cover plate ( ) and the bottom plate ( ) by flanging of projecting ends ( ).