Exhaust gas recirculation valve for an internal combustion engine

US5975064A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Erwin Krimmer · Plüderhausen, DE
• Bruno Hezel · Stuttgart, DE
• Eberhard Wizgall · Stuttgart, DE
• Tilman Miehle · Weingarten, DE
• Peter Jauernig · Tiefenbronn, DE

Key dates

• Filing date: Aug 14, 1998
• Grant date: Nov 2, 1999
• Expiry date: Aug 14, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M26/68
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An exhaust gas recirculation valve having a valve member that cooperates with a valve seat of a connection neck of an exhaust gas recirculation line. The neck protrudes into a tube of the intake system of an internal combustion engine, and the valve seat points toward the inlet side of the exhaust gas recirculation line. A valve member of the exhaust gas recirculation valve is thus acted upon by the exhaust gas pressure in the closing direction, as a supplement to a compression spring counter to an armature of an electromagnet acting in the opening direction. To compensate for the forces acting in the closing direction, the exhaust gas is carried via a conduit in the valve shaft into a control chamber, which is closed off from the pressure in the tube via a movable wall, having an effective surface area that substantially corresponds to the effective surface area of the valve member. This obtains a balance of forces, such that the control of the exhaust gas recirculation valve depends only on the electromagnetic forces and on the force of the compression spring.