Fuel injector
AssigneeRobert Bosch GmbH
InventorMartin Scheffel
Life of this patent
Estimating the term…
Abstract
The fuel injector for fuel-injection systems of combustion engines has an excitable actuator for actuating a valve-closure member, which forms a sealing seat together with a valve-seat surface. At least one spray-discharge orifice is formed downstream from the valve-seat surface from which fuel is output in the direction of a combustion chamber. In addition, the fuel injector has a nozzle body, which surrounds the valve-seat surface or accommodates a valve-seat body having the valve-seat surface. The nozzle body is introduced into a downstream thin-walled extension of a connection piece, which also serves as an inner pole of a magnetic circuit, and is fixedly connected to this extension.
Claims26
A fuel injector for a fuel-injection system of an internal combustion engine, comprising:
- a valve-seat surface;
- a valve-closure member for forming a sealing seat together with the valve-seat surface;
- an excitable actuator for actuating the valve-closure member;
- at least one spray-discharge orifice situated downstream from the valve-seat surface;
- a one-piece connection element connecting to and extending from a fuel supply, the connection element being an inner pole of a magnetic circuit;
- and
- a nozzle body one of (a) including the valve-seat surface and (b) accommodating a valve-seat body having the valve-seat surface, the nozzle body being inserted into, and fixedly connected to, the connection element, wherein:
- the nozzle body is held in the fixed connection to the connection element via a junction point at which the nozzle body and the connection element are directly joined;
- the connection element includes a downstream extension that is delimited from a base section of the connection element by reduction of thickness of the extension relative to the base section, an enlarged cavity being formed by the reduction of the thickness;
- and
- the inner pole and the extension are magnetically separated from one another in that there is a thin-walled connection between them, which constitutes a magnetic restriction.
A fuel injector for a fuel-injection system of an internal combustion engine, comprising:
- a valve-seat surface;
- a valve-closure member for forming a sealing seat together with the valve-seat surface;
- an excitable actuator for actuating the valve-closure member;
- at least one spray-discharge orifice situated downstream from the valve-seat surface;
- a connection piece;
- and
- a nozzle body one of (a) including the valve-seat surface and (b) accommodating a valve-seat body having the valve-seat surface, the nozzle body being inserted into a downstream extension of the connection piece, which is also used as an inner pole of a magnetic circuit, and being fixedly connected to the extension;
- wherein the magnetic circuit is sealed by an outer magnetic component that is configured as a fully circumferential magnetic cup including side walls radially surrounding the excitable actuator and a bottom surface that extends underneath the excitable actuator.
A fuel injector for a fuel-injection system of an internal combustion engine, comprising:
- a valve-seat surface;
- a valve-closure member for forming a sealing seat together with the valve-seat surface;
- an excitable actuator for actuating the valve-closure member;
- at least one spray-discharge orifice situated downstream from the valve-seat surface;
- a connection piece;
- and
- a nozzle body one of (a) including the valve-seat surface and (b) accommodating a valve-seat body having the valve-seat surface, the nozzle body being inserted into, and fixedly connected to, a downstream extension of the connection piece, the connection piece being also used as an inner pole of a magnetic circuit;
- wherein:
- a portion the nozzle body and at least a portion of the extension of the connection piece overlap each other in an overlap region;
- a portion of the nozzle is outside of the overlap region and does not overlap any portion of the connection piece;
- a portion of the connection piece is outside the overlap region and does not overlap any portion of the nozzle body;
- the portion of the nozzle body that is in the overlap region is more thin-walled than the portion of the nozzle body that is outside the overlap region;
- the portion of the connection piece that is in the overlap region is more thin-walled than all of the portion of the computer piece that is outside the overlap region;
- and
- the inner pole and the extension are magnetically separated from one another in that there is a thin-walled connection between them, which constitutes a magnetic restriction.
Dependencies are inferred from the claim text.