The present application concerns a fuel-injection metering device for a motor vehicle. The fuel-injection device include a main body with at least one through-hole, whereby the main body forms a valve seat on its inner face that is provided to interact with a valve body, whereby the inner face of the main body is electrochemically machined. The application also concerns a mould, a production method, and a fuel-injection nozzle.

The present application concerns a fuel-injection metering device for a motor vehicle. The fuel-injection device include a main body with at least one through-hole, whereby the main body forms a valve seat on its inner face that is provided to interact with a valve body, whereby the inner face of the main body is electrochemically machined. The application also concerns a mould, a production method, and a fuel-injection nozzle.

The invention relates to an injection nozzle (1) for injecting a fluid, in particular a liquid or gaseous fuel, comprising: a nozzle body (2) which is designed to be hollow-cylindrical at least in portions and forms a sealing seat (3) via which a flow path (4) for the fluid to be injected leads, a nozzle needle (5) which is accommodated in the nozzle body (2) for reciprocating movement and has a sealing surface (6) that interacts with the sealing seat (3), a guide element (7) which is fixedly connected to the nozzle needle (5) and is guided by means of an external guide (8) of the nozzle body (2).

The invention further relates to a fuel injector having an injection nozzle (1) according to the invention.

The invention relates to an injection nozzle (1) for injecting a fluid, in particular a liquid or gaseous fuel, comprising: a nozzle body (2) which is designed to be hollow-cylindrical at least in portions and forms a sealing seat (3) via which a flow path (4) for the fluid to be injected leads, a nozzle needle (5) which is accommodated in the nozzle body (2) for reciprocating movement and has a sealing surface (6) that interacts with the sealing seat (3), a guide element (7) which is fixedly connected to the nozzle needle (5) and is guided by means of an external guide (8) of the nozzle body (2).

The invention further relates to a fuel injector having an injection nozzle (1) according to the invention.

A fuel injector includes a collar, which may be formed of a porous, sintered material, the collar being located around the needle and allowing a restricted fluid pathway, such as orifices through the collar, between first and second volumes of fuel, the collar being located in a section of the nozzle body which has a greater cross-sectional area than the rest of the bore.

A fuel injector includes a collar, which may be formed of a porous, sintered material, the collar being located around the needle and allowing a restricted fluid pathway, such as orifices through the collar, between first and second volumes of fuel, the collar being located in a section of the nozzle body which has a greater cross-sectional area than the rest of the bore.

An injector for injecting fluid with a valve assembly including a valve body and a valve needle, the needle including an armature retainer and being operable to prevent and to enable injection of fluid, and with an electromagnetic actuator assembly, operable to exert a force for influencing a position of the valve needle, including a pole piece and an armature. The pole piece is positionally fixed with the valve body. The armature is operable to be axially displaced relative to the pole piece and to take along the armature retainer when being displaced towards the pole piece. A fluid channel is defined by the armature retainer constriction surface and the pole piece constriction surface. A hydraulic diameter of the fluid channel is at least twice at large when the valve needle is in a closing position compared to the hydraulic diameter at a maximum displacement away from the closing position.

An injector for injecting fluid with a valve assembly including a valve body and a valve needle, the needle including an armature retainer and being operable to prevent and to enable injection of fluid, and with an electromagnetic actuator assembly, operable to exert a force for influencing a position of the valve needle, including a pole piece and an armature. The pole piece is positionally fixed with the valve body. The armature is operable to be axially displaced relative to the pole piece and to take along the armature retainer when being displaced towards the pole piece. A fluid channel is defined by the armature retainer constriction surface and the pole piece constriction surface. A hydraulic diameter of the fluid channel is at least twice at large when the valve needle is in a closing position compared to the hydraulic diameter at a maximum displacement away from the closing position.

A method for manufacturing an injector for injecting fuel, the injector including: a closing body which is linearly movable in an axial direction and a valve seat element having at least one passage for injecting the fuel, a valve seat with which the closing body is in contact for closing off the at least one passage, and a guide area for guiding the closing body when same is moving in the axial direction, the method being characterized in that the valve seat and the guide area are hard turned.

A method for manufacturing an injector for injecting fuel, the injector including: a closing body which is linearly movable in an axial direction and a valve seat element having at least one passage for injecting the fuel, a valve seat with which the closing body is in contact for closing off the at least one passage, and a guide area for guiding the closing body when same is moving in the axial direction, the method being characterized in that the valve seat and the guide area are hard turned.