Electromagnetically actuatable fuel injection valve

US4700891A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Waldemar Hans · Bamberg, DE
• Wilhelm Kind · Bamberg, DE
• Heinrich Knapp · Leonberg, DE
• Wolfgang Kramer · Jena, DE
• Rudolf Sauer · Memmingen, DE

Key dates

• Filing date: Sep 29, 1986
• Grant date: Oct 20, 1987
• Expiry date: Sep 29, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M51/08
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A magnetic injection valve for injecting fuel into the intake tract of internal combustion machines, which is distinguished by particularly good internal cooling. A magnetic coil wound onto a coil carrier is located in the valve, being introduced into a valve housing and surrounds a ferromagnetic core. The core acts upon an armature which is connected to a movable valve needle. A bushing in the core and a sleeve located outside the core are arranged such that the fuel, emerging from an inflow tract of a supply device flows via the sleeve serving as a fuel line and reaches the interior of the valve housing that receives the magnetic coil; after flowing virtually completely around the magnetic coil, the fuel leaves this interior via a bore and flows back between the bushing and the core as far as the end of the bushing, and then flows on through the bushing to reach the armature to flow on to the valve seat. For better cooling of the magnetic coil, flow conduits are machined into the coil holder such that the fuel flow virtually surrounds the coil.