Patent ID: 6027047
Filing Date: 2000-02-22
Classification: F02M

Abstract:
A magnetic valve controlled injector for a storage fuel injection system of a multi-cylinder internal combustion engine, said injector including a top housing part mounted on top of a bottom housing part, a magnetic valve disposed on top of the top housing part and a nozzle body including a spring-loaded nozzle needle disposed in a nozzle body arranged below the bottom housing part, said top housing part having a central bore forming a control cylinder with a control piston movably disposed therein, and said lower housing part having a central bore with a valve piston element movably disposed therein in engagement with said control piston and forming a piston controlled valve, a fuel supply passage extending through said lower housing and, by way of said piston-controlled valve, to a fuel pressure chamber formed around said nozzle needle for the ejection of high pressure fuel from said injector when said nozzle needle is lifted by the fuel pressure in said fuel pressure chamber, said control piston defining at its side remote from said nozzle needle a control chamber which is in communication with said fuel supply passage by way of a fuel passage extending through said control piston and said valve piston and with a fuel drain passage under the control of said magnetic valve, said valve piston having a smaller diameter than said control piston and engaging said control piston in the area of jointure of said housing top and said housing bottom parts.