Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – And filter – sifter or screen
Reexamination Certificate
2000-02-23
2001-03-13
Brinson, Patrick (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
And filter, sifter or screen
C239SDIG002, C239S585100, C239S533200, C239S590000, C210S232000, C210S445000, C137S549000, C123S470000
Reexamination Certificate
active
06199775
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a filter, and more particularly a fuel injector filter having a composite housing including a plastic body that is reinforced with a metal ferrule. The fuel filter also provides a retaining feature preventing axial dislocation of an O-ring surrounding the fuel injector and sealingly connecting the fuel injector to a fuel supply.
It is known to use a fuel filter to remove particulate matter and impurities from a fuel used in a conventional fuel injector assembly. The use of a fuel filter is believed to increase the efficiency of an engine using the fuel injector assembly, as well as to decrease the production of undesired exhaust. These fuel filters are often attached to an inlet tube of the fuel injector assembly by a manufacturing process known as “staking.” The fuel filter must be precisely aligned before attachment to the fuel injector assembly. Thus, the manufacturing process of the fuel injector assembly is laborious and expensive. Further, the attached fuel filter may not be easily removed from the fuel filter assembly.
For these reasons, it is desired to have a fuel filter which may be easily installed and removed from a fuel injector assembly.
SUMMARY OF THE INVENTION
The present invention provides a filter unit for an inlet tube of a fuel injector. The inlet tube has an inside surface, an outside surface, and an annular end surface extending between the inside and outside surfaces. The filter unit includes a filter mesh defining a flow area. A body directs fuel flow through the flow area. The body has a first portion adapted for overlying the inside surface, a second portion adapted for overlying the annular end surface, and a third portion adapted for overlying the outside surface. A ferrule reinforces the body. The ferrule has a first part contiguously engaging the first portion of the body, a second part contiguously engaging the second portion of the body, and a third part contiguously engaging the third portion of the body.
The present invention further provides a fuel injector including an inlet tube having an inside surface, an outside surface, and an annular end surface extending between the inside and outside surfaces. A filter unit includes a filter mesh defining a flow area. A body directs fuel flow through the flow area. The body has a first portion overlying the inside surface, a second portion overlying the annular end surface, and a third portion overlying the outside surface. A ferrule reinforces the body. The ferrule has a first part contiguously engaging the first portion of the body, a second part contiguously engaging the second portion of the body, and a third part contiguously engaging the third portion of the body.
The present invention also provides a method of manufacturing a filter unit for an inlet tube of a fuel injector. A filter mesh defining a flow area is provided. A ferrule having a first part adapted for overlying the inside surface, a second part adapted for overlying the annular end surface, and a third part adapted for overlying the outside surface is provided. A body to connect the filter mesh and the ferrule is molded, the body directing the fuel flow through the flow area.
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patent: 2 225 383 (1990-05-01), None
patent: WO 94/25748 (1994-11-01), None
Brinson Patrick
Nguyen Dinh Q
Siemens Automotive Corporation
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