Fuel injector

US7083114B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Maeurer · Ditzingen, DE
• Ulrich Doebler · Waiblingen, DE
• Hubert Stier · Asperg, DE
• Guenther Hohl · Stuttgart, DE
• Rene Deponte · Sersheim, DE

Key dates

• Filing date: Nov 26, 2002
• Grant date: Aug 1, 2006
• Expiry date: Jul 5, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injector for the direct injection of fuel into the combustion chamber of an internal combustion engine includes an actuator, which is encapsulated in a first sleeve and is sealed from an inner chamber of the fuel injector; a valve needle actuable by the actuator, which includes a valve-closure member cooperating with a valve-seat surface to form a sealing seat; and a locking spring, by which the valve needle is acted upon in such a manner that the valve-closure member is held in sealing contact at the valve-seat surface. An inflow-side end face of the first sleeve is dimensioned such that a linear deformation of the first sleeve, caused by the fuel pressure present at the inflow-side end face, is compensated by a linear deformation of the actuator and an activating piston extending the actuator.