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:
May. 29, 2007
Filed:
Apr. 09, 2004
Dejan Jovovic, Regensburg, DE;
Günter Lewentz, Regensburg, DE;
Andreas Voigt, Regensburg, DE;
Claus Zumstrull, Regenstauf, DE;
Dejan Jovovic, Regensburg, DE;
Günter Lewentz, Regensburg, DE;
Andreas Voigt, Regensburg, DE;
Claus Zumstrull, Regenstauf, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method for producing a tubular spring () in the form of a cylindrical hollow body, especially for pre-tensioning a piezoelectric actuator element () of an actuator unit () of a fuel injector comprises the step of providing a thin-walled, solid-drawn steel tube with a plurality of regularly arranged longish recesses () by means of laser cutting. Thus, an actuator unit () comprises a piezoelectric actuator element () which is arranged in a thin-walled cylindrical hollow body, wherein the hollow body being elastically embodied and pre-tensioning the actuator element (). Furthermore, the hollow body is a solid-drawn steel tube which is provided with a plurality of longish recesses ().