Fuel injection valve for internal combustion engines
AssigneeDaimlerChrysler AG
InventorMartin Hoppenstedt
Life of this patent
Estimating the term…
Abstract
A fuel injection valve for internal combustion engines. The valve includes a nozzle needle longitudinally displaceably guided in a nozzle body and having a tensioning nut which axially braces the nozzle body with a nozzle holder, optionally, by way of a transition piece whose respective faces rest on an adjacent face. The valve also includes at least one feed pipe extending in the nozzle holder and the nozzle body, and fuel-carrying transfer points between the nozzle holder and the nozzle body. A portion of at least one of interacting faces (3a; 4a) being constructed as a raised contact surface (11) with surface elements surrounding the fuel-carrying transfer points.
Claims21
A fuel injection valve for internal combustion engine, comprising:
- a nozzle needle longitudinally displaceably guided in a nozzle body, a tensioning nut adapted to axially brace the nozzle body and a nozzle holder, at least one feed pipe extending in the nozzle holder and the nozzle body, and fuel-carrying transfer points between the nozzle holder and the nozzle body, wherein a portion of at least one of the nozzle body and the nozzle holder have respective interacting faces, at least one of which is constructed as a raised contact surface with surface elements surrounding the fuel-carrying transfer points.
A fuel injection valve comprising:
- a nozzle needle longitudinally displaceably guided in a nozzle body;
- a tensioning nut which axially connects the nozzle body with a nozzle holder, the nozzle body and nozzle holder each being provided with a respective interacting face;
- and
- at least one fuel feed pipe extending through the nozzle holder and the nozzle body, the nozzle body and nozzle holder having fuel transfer points between them, wherein a portion of at least one of the interacting faces is provided with a raised contact surface having surface elements which surround the fuel transfer points.
A method for preventing fuel leakage in a fuel injection valve comprising:
- forming a nozzle holder having a central bore, a fuel feed bore and an interacting face;
- forming a nozzle body having a central bore in which a nozzle needle is longitudinally and displaceable positioned, a fuel feed bore and an interacting face;
- forming a raised contact surface on the interacting face of either the nozzle holder or the nozzle body, at least a portion of the raised contact surface having formed thereon at least one surface element positioned so as to surround the fuel feed bore;
- co-axially arranging the nozzle body and nozzle holder such that the fuel feed bore of both are aligned thereby forming a fuel transfer point therebetween, the at least one surface element surrounding the fuel transfer point;
- and
- maintaining the nozzle body and nozzle holder in a connected position with a tensioning nut.
Dependencies are inferred from the claim text.