Injection valve for an internal combustion engine, in particular a diesel motor

An injection valve for supplying fuel from a fuel source to an internal combustion engine, said injection valve including:

• an elongated valve housing, said valve housing having a first end and a second end distal from said first end and being formed to define:
• a feed conduit in said first end through which fuel is received from the fuel source;
• a discharge conduit in said first end wherein through which the fuel is discharged;
• an elongated hole that extends from said feed conduit to said second end;
• an injection opening in said second end that is in fluid communication with said elongated hole;
• and a feed bore connected in parallel across said elongated hole for providing fluid communication between said feed conduit and said injection opening;
• an elongated nozzle needle seated in said elongated hole formed in said valve housing, said nozzle needle having a first end positioned adjacent said injection opening formed in said valve housing to control fuel flow through said injection opening and a second end distal front said first end;
• a conduit part disposed in said valve housing adjacent said discharge conduit, said conduit part being formed with a discharge opening that provides fluid communication between said elongated hole in said valve housing and said discharge conduit;
• a control valve attached to said valve housing, said control valve having a moveable valve member for selectively opening and closing said discharge opening formed in said conduit part so as to control fluid flow from said elongated hole in said valve housing to said discharge conduit;
• and
• a fluid-set valve located in said elongated hole formed in said valve housing so as to be located next to said feed conduit, said fluid-set valve including:
• an annular valve seat defined by said valve housing so as to extend into said elongated hole so as to be located at a position between said feed conduit and said conduit part;
• and
• a moveable valve member located in said elongated hole so as to be located between said valve seat and said second end of said nozzle needle, said valve member having a first end located adjacent said nozzle needle and a second end adjacent said valve seat and being shaped to define:
• a control chamber in said elongated hole between said second end of said nozzle needle and said first end of said valve member;
• a supplemental chamber in said elongated hole between said conduit part and said second end of said valve member;
• a valve bore in said valve member that provides fluid communication between said control chamber and said supplemental chamber;
• a throttle bore that extends transversely through said valve member so as to provide a fluid communication path between said feed conduit and an opposed side of said valve member wherein said throttle bore is in fluid communication with said valve bore;
• and a valve chamber that is defined by said valve member and said valve housing so as to be located adjacent to said valve seat and so as to be in fluid communication with said feed conduit, wherein when said valve member is disposed against said valve seat, fuel flow from said valve chamber to said supplemental chamber is blocked and when said valve member is spaced from said valve seat, fuel flows from said valve chamber to said supplemental chamber so that fuel introduced to said valve chamber from said feed conduit flows through said valve chamber, said supplemental chamber and said valve bore into said control chamber.