Apparatus and method for setting injector lift
AssigneeSiemens Automotive Corporation
InventorMichael P. Dallmeyer
Life of this patent
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Abstract
A method of directly setting an injector lift that involves the provisioning of a valve body having an uniform internal diameter, inserting a sleeve assembly to a predetermined distance and securing the sleeve assembly. The apparatus includes a sleeve, a lower armature guide and a seat, all of which can be integral so as to facilitate the setting of the injector lift. The sleeve assembly is press-fitted and secured by known attachment techniques.
Claims12
A fuel injector for use with an internal combustion engine, the fuel injector comprising:
- a housing having a flow passage extending along a longitudinal axis between a first end and a second end;
- an electromagnetic actuator including a stator having an end face;
- an armature assembly proximate the first end, the armature assembly having a surface in confronting arrangement with the end face;
- spring means to establish a gap between the end face and the surface;
- a flow metering device disposed within the flow passage proximate the second end, the flow metering device engaging the armature assembly;
- and
- a sleeve disposed along the longitudinal axis within the flow passage at a preset position, the sleeve including a circumferential portion contiguous to a circumferential portion of the housing extending along to and about the longitudinal axis, the sleeve bearing against the flow metering device to define the gap.
Fuel injector, for use with an internal combustion engine, the fuel injector comprising:
- a housing having a flow passage extending along a longitudinal axis between a first end and a second end;
- an electromagnetic actuator including a stator having an end face;
- an armature assembly proximate the electromagnetic actuator, the armature assembly having a surface in confronting arrangement with the end face;
- spring means to establish a gap between the end face and the surface;
- a flow metering device disposed within the flow passage proximate the second end, the flow metering device engaging the armature assembly and the sleeve to define a spring preload on the armature assembly;
- and
- a sleeve disposed along the longitudinal axis within the flow passage at a preset position, the sleeve bearing against the flow metering device to define the gap, the sleeve including an annulus having an outside diameter substantially equal to an inside diameter of the flow passage and a circumferential thickness between 5 to 25 percent of the inside diameter of the housing, the annulus being fixedly located in the flow passage by a working fit between the two diameters.
A fuel injector, for use with an internal combustion engine, the fuel injector comprising:
- a housing having a flow passage extending along a longitudinal axis between a first end and a second end;
- an electromagnetic actuator including a stator having an end face;
- an armature assembly proximate the electromagnetic actuator, the armature assembly having a surface in confronting arrangement with the end face;
- spring means to establish a gap between the end face and the surface;
- a flow metering device disposed within the flow passage proximate the second end, the flow metering device engaging the armature assembly;
- and
- a sleeve disposed along the longitudinal axis within the flow passage at a preset position, the sleeve bearing against the flow metering device to define the gap, the sleeve including a substantially non-magnetic annulus having an inside diameter between 67% to 85% of the outside diameter of the flow passage.
Dependencies are inferred from the claim text.