Electromagnetic valve for controlling an injection valve of an internal combustion engine

US6820858B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rainer Haeberer · Bretten, DE
• Matthias Horn · Tettnang, DE
• Andreas Rettich · Herrenberg, DE
• Robert Hajnovic · Kornwestheim, DE

Key dates

• Filing date: Oct 24, 2002
• Grant date: Nov 23, 2004
• Expiry date: Feb 13, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2547/003
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A solenoid valve for controlling an injection valve of an internal combustion engine is provided, including an electromagnet, a movable armature, a control valve member moved with the armature and cooperating with a valve seat for opening and closing a fuel discharge channel of a control pressure chamber of the injection valve, and a sliding piece guiding the armature, which is positioned together with the armature and the control valve member in an armature chamber. For reducing the bounce of the armature, the sliding piece subdivides the armature chamber into a pressure relief chamber connected to a fuel low-pressure connection and an hydraulic damping chamber, into which a fuel discharge channel opens. The damping chamber may be pressure-relieved to a pressure relief chamber via at least one connecting channel provided with a throttle, the speed of the control valve member being lowered during the closing of solenoid valve, before impact on valve seat, by a fuel pressure cushion acting upon the control valve member in the damping chamber.