Patent · US Expired

Method for pretreating a piezoelectric ceramic and method for adjusting an injection valve

US7334329B2 · kind B2 · utility

1Cited by

7References

22Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Matthias Göller · Weißbach, DE
Stefan Kohn · Hohenburg, DE
Wolfgang Reisinger · Regenstauf, DE
Andreas Voigt · Regensburg, DE
Claus Zumstrull · Regenstauf, DE

Key dates

Filing date	Jul 30, 2004
Grant date	Feb 26, 2008
Priority date	—
Expiry date	Nov 7, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49302
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In a method for pretreating a piezoelectric ceramic (1) and a method for adjusting an injection valve (7), the piezoelectric ceramic (1) is exposed to environmental conditions, leading to a reduction of polarization and also a reduction of the length of the ceramic (1). The obtained length exhibits a greater long-term stability due to said adjusting phase. Consequently, the injection valve (7) can be re-adjusted before use. As a result, renewed adjustment thereof is required only after a long period in service.

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