Method of filling and degassifying fluid in a hydraulic compensator for a fuel injector
AssigneeSiemens VDO Automotive Corporation
InventorsJack Lorraine, Bogdan Gromek
Life of this patent
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Abstract
At least one method of degasifying, filling fluid and assembling a hydraulic compensator for a solid state actuated fuel injector is disclosed. The method involves partially assembling a compensator assembly and immersing the partial assembly in a hydraulic and under a vacuum for a first predetermined time period. The partially assembled compensator is then assembled while immersed in the fluid and under a vaccum for a second time period.
Claims15
A method of degasifying air in a hydraulic compensator, the compensator having a body including a first body end and a second body end, the first body end and second body end extending along a longitudinal axis, the body having a body inner surface facing the longitudinal axis and a fitting, a piston assembly including a first piston having a first working surface and a second working surface distal to the first working surface, the first piston including an extension portion coupled to the first piston, a second piston disposed proximate the extension portion of the first piston and having a spring disposed therebetween, the second piston having a surface that confronts the second working surface, a first sealing member coupled to the second piston, and a flexible fluid barrier coupled to the first piston and the second piston, the method comprising:
- immersing the piston assembly in a container of fluid;
- and
- establishing a pressure on the medium acting on the fluid that is lower than ambient air pressure so that a gaseous medium trapped in at least one of the fluid and the piston assembly is generally removed therefrom.
A method of filling fluid in a compensator of a fuel injector, the compensator having a body including a first body end and a second body end extending along a longitudinal axis, the body having a body inner surface facing the longitudinal axis and a fitting, a first piston having a first working surface and a second working surface distal to the first working surface, the first piston including an extension portion coupled to the first piston, a second piston disposed proximate the first piston, the second piston having a surface that confronts the second working surface, a first sealing member coupled to the second piston, and a flexible fluid barrier, the method comprising:
- providing a gap between the first piston and the second piston by coupling the first piston and second piston to form a piston assembly;
- immersing the piston assembly in a container containing fluid;
- and
- establishing a pressure on the fluid in the container to a predetermined pressure for at least one predetermined time period.
Dependencies are inferred from the claim text.