Patent · US Expired

Method for producing a tubular spring and an actuator unit comprising one such tubular spring

US7222424B2 · kind B2 · utility

8Cited by

5References

7Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Dejan Jovovic · Regensburg, DE
Gunter Lewentz · Regensburg, DE
Andreas Voigt · Regensburg, DE
Claus Zumstrull · Regenstauf, DE

Key dates

Filing date	Apr 9, 2004
Grant date	May 29, 2007
Priority date	—
Expiry date	Jul 23, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49609
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method for producing a tubular spring (12) in the form of a cylindrical hollow body, especially for pre-tensioning a piezoelectric actuator element (2) of an actuator unit (1) of a fuel injector comprises the step of providing a thin-walled, solid-drawn steel tube with a plurality of regularly arranged longish recesses (14) by means of laser cutting. Thus, an actuator unit (1) comprises a piezoelectric actuator element (2) which is arranged in a thin-walled cylindrical hollow body, wherein the hollow body being elastically embodied and pre-tensioning the actuator element (2). Furthermore, the hollow body is a solid-drawn steel tube which is provided with a plurality of longish recesses (14).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.