Injector, especially fuel injection valve, with a piezoelectric actor

US6969009B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Georg Bachmaier · Birkenfeld, DE
• Bernhard Fischer · Wien, AT
• Bernhard Gottlieb · Munich, DE
• Andreas Kappel · Höhenkirchen-Siegertsbrunn, DE
• Hans Meixner · Haar, DE
• Tim Schwebel · Birkenfeld, DE

Key dates

• Filing date: Sep 29, 2003
• Grant date: Nov 29, 2005
• Expiry date: Sep 29, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M61/08
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The jacket surface of the piezoelectric actor body (1) is surrounded by an injector housing (9), maintaining an intermediate space and is cooled by direct contact with an inert fluid which does not conduct electricity (6), forming a fluid space in the injector housing (9) which is filled with fluid except for an air reservoir (7). The volume of the air reservoir (7) is at least large enough to allow the thermal expansion of the heat coupling fluid (6) which occurs at the highest operating temperature of the actor body (1).