Fuel-injection valve for internal combustion engines

US6626151B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Boehm · Munich, DE
• Rainer Haeberer · Bretten, DE
• Helmut Clauss · Tamm, DE
• Felix Landhaeusser · Notzingen, DE
• Markus Rueckle · Stuttgart, DE

Key dates

• Filing date: Apr 15, 2002
• Grant date: Sep 30, 2003
• Expiry date: Apr 15, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M63/0225
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system for internal combustion engines, has a distributor tube and a high-pressure pump which is driven as a function of engine rpm and serves to generate the fuel pressure and fuel throughput required in the distributor tube in the applicable operating state of the engine, and also has a fuel metering unit, which is assigned to the high-pressure pump and is based on an electromagnetically actuated regulating valve. The fuel metering unit is disposed in the high-pressure pump, and the outlet of the regulating value discharges into the low-pressure region of the high-pressure pump. The inlet of the regulating valve communicates with the compression side of a prefeed pump. The regulating valve has a valve piston, which is actuated—into the opening position—by a compression spring and which is actuatable counter to the spring force—into the closing position—by an armature bolt of the electromagnet. Valve piston has at least one and preferably more radial control openings, which are in operative communication with the intake side of the high-pressure pump.