Fuel injection valve with integrated spark plug

US6536405B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Franz Rieger · Aalen, DE
• Gernot Wuerfel · Lambach, DE
• Stefan Kampmann · Bamberg, DE

Key dates

• Filing date: May 19, 2000
• Grant date: Mar 25, 2003
• Expiry date: May 19, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M61/163
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injector having an integrated spark plug (1) for injecting fuel directly into a combustion chamber (72) of an internal combustion engine and for igniting the fuel that is injected into the combustion chamber (72) has a valve body (7), which, together with a valve-closure member (10), forms a sealing seat. Disposed contiguously to the sealing seat is a discharge orifice (12), which discharges at a valve-body (7) end face (73) facing the combustion chamber (72). Provision is also made for a housing body (2) that is insulated from the valve body (7), and for an ignition electrode (70a) that is connected to the housing body (2). In this context, a spark arc-over is produced between the valve body (7) and the ignition electrode (70a). The ignition electrode (70a) and the valve body (7) are formed in such a way that the spark arc-over takes place between the end face (73) of the valve body (7) facing the combustion chamber (72) and the ignition electrode (70a). In the vicinity of the discharge orifice (12), the ignition electrode (70a) has an edge (74) in order to reproducibly define the position of the spark arc-over at the end face (73) of the valve body (7) with respect to the …