Fuel injection valve with integrated spark plug

• US 6,536,405 B1
• Filed: 05/19/2000
• Issued: 03/25/2003
• Est. Priority Date: 06/27/1998
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Rieger, Franz, Wuerfel, Gernot, Kampmann, Stefan
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US09/486,402
• Time in Patent Office: 1,040 Days
• Field of Search: 123/297, 123/169.V, 313/120
• US Class Current: 123/297
• CPC Class Codes: F02M 51/0671 the armature having an elongated valve body attached thereto
• CPC Class Codes: F02M 57/06 the devices being sparking plugs
• CPC Class Codes: F02M 61/163 Means being injection-valves with helically or spirally shaped grooves

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 position of the discharge orifice (12).

Claims

1. A fuel injector associated with an integrated spark plug for injecting a fuel directly into a combustion chamber of an internal combustion engine and for igniting the fuel that is injected into the combustion chamber, comprising:

a valve-closure member;

a valve body forming with the valve-closure member a sealing seat to which a discharge orifice that discharges at a level end face of the valve body facing the combustion chamber is contiguously disposed;

a housing body insulated from the valve body; and

a plurality of pin-shaped ignition electrodes provided at the housing body to produce a spark arc-over between the valve body and the plurality of pin-shaped ignition electrodes;

wherein the plurality of pin-shaped ignition electrodes and the valve body are formed so that a spark arc-over occurs between the level end face of the valve body and the plurality of pin-shaped ignition electrodes;

wherein at least one of the level end face of the valve body and the plurality of pin-shaped ignition electrodes include an edge in a vicinity of the discharge orifice to reproducibly define a position of the spark arc-over at the level end face of the valve body with respect to a position of the discharge orifice; and

wherein the housing body includes a mount fixture that projects over the level end face of the valve body and to which the plurality of pin-shaped ignition electrodes are secured so as to be tilted at a predefined inclination angle toward the level end face of the valve body; and

wherein one edge of each of the plurality of pin-shaped ignition electrodes opposes the level end face of the valve body.