Tubular spring for actuator, and method for assembling the tubular spring

US7564175B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Hubert Stier · Asperg, DE
• Dietmar Schmieder · Markgröningen, DE
• Rene Deponte · Sersheim, DE

Key dates

• Filing date: Apr 6, 2005
• Grant date: Jul 21, 2009
• Expiry date: Apr 13, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/03
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A tubular spring is provided for preloading a piezoelectric or magnetostrictive actuator for the actuation of fuel injection valves for fuel injection systems of internal combustion engines. The tubular spring has at least two assembly engagements for uniform preloading of the tubular spring.