Magnetic valve

US4832312A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst Linder · Mühlacker, DE
• Helmut Rembold · Stuttgart, DE
• Manfred Ruoff · Heubach, DE
• Walter Schlagmueller · Schwieberdingen, DE

Key dates

• Filing date: Aug 26, 1988
• Grant date: May 23, 1989
• Expiry date: Aug 26, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/466
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

For controlling high-pressure phases during the stroke of a pump piston of a fuel injection pump, magnetic valves are also used, which are built into relief lines of the pump work chamber of such fuel injection pumps and which with the instant of closure of the relief line determine the injection onset and with the instant of reopening of the relief line determine the end of injection and hence the injection quantity. Such valves must be capable of switching rapidly, in view of the high rpm of internal combustion engines, yet must be as small as possible and use the least possible energy. By using a piston slide which in the closing state is balanced in pressure on the high-pressure side, and by relieving the chambers defined on the face end by the piston slide, a fast-switching, recoilless magnetic valve is obtained, which is opened by a restoring spring when the electromagnet is in the currentless state. This makes the use of the magentic valve in combination with electrically controlled injection pumps particularly advantageous.