Fuel injection apparatus for internal combustion engines

US4750462A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Egler · Stuttgart, DE
• Jean Leblanc · Val-de-Reuil, FR
• Helmut Pfeifle · Stuttgart, DE
• Jean Pigeroulet · Villeurbanne, FR
• Francois Rossignol · Montréal, CA
• Dietrich Trachte · Leonberg, DE

Key dates

• Filing date: Jun 11, 1986
• Grant date: Jun 14, 1988
• Expiry date: Jun 11, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection apparatus which the termination of the effective pump supply stroke is effected by exposing a relief conduit with the aid of a valve having for instance a control edge, whereupon a highly pressurized fuel flows out via the relief conduit and is directed into a pressure chamber defined by a rear face of a pressure valve closing member. The pressure valve closing member is located in a connection with a fuel injection line that leads from the pump work chamber to the fuel injection valve and is acted upon by a valve spring to effect closing of this injection line. The impact of fuel that reaches the pressure chamber via the releif conduit reinforces a fast closure of the pressure valve closing member at the end of injection, which leads to an abrupt termination of an injection cycle. In addition, or altenatively, the fuel injection valve closing member can also be acted upon by the impact of fuel diversion.