|Publication number||USRE42059 E1|
|Application number||US 11/789,797|
|Publication date||Jan 25, 2011|
|Filing date||Apr 25, 2007|
|Priority date||Apr 12, 2004|
|Also published as||DE102005015918A1, DE102005015918B4, US6884349|
|Publication number||11789797, 789797, US RE42059 E1, US RE42059E1, US-E1-RE42059, USRE42059 E1, USRE42059E1|
|Original Assignee||Cummins Filtration Ip Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (33), Classifications (16), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This is a reissue application of U.S. application Ser. No. 10/822,433 now U.S. Pat. No. 6,884,349.
The present invention relates in general to fluid filtration devices that are constructed and arranged to filter an incoming fluid prior to utilization of that fluid downstream from the filtration site. More specifically, the present invention relates to a fuel filter that includes a centerpost assembly and a replaceable filter cartridge that slides onto the centerpost assembly. One focus of the present invention is the concept of preventing fuel delivery to the engine if a “proper” filter cartridge is not installed on the centerpost assembly. In the context of the present invention, the term “proper” is used to describe a filter cartridge that is approved for use by the original equipment manufacturer. It is important that the replacement filter cartridge maintain design compatibility so that it fits properly and is properly sealed around the centerpost assembly.
In a more generic sense, the concept of “no filter-no run” means that if a filter cartridge is not installed, there is no appreciable flow of fuel to the engine. While the present invention provides this type of structure by its design of a “proper” filter cartridge, the specifics of the centerpost assembly and filter cartridge construction are important. One beneficial feature of the present invention is that its selected construction for this flow-control feature is not restrictive to the flow of fuel. If the selected construction for the flow-control feature were to introduce too much restriction, this could cause fuel system problems or inefficiencies.
Any prior art filter structures that try to address the desire for a “no filter-no run” design are considered to have various disadvantages. For example, the resulting structures are typically either too complicated, too hard to service, too costly, or have a flow-control valve construction that is too restrictive to the fuel flow. Another design disadvantage of earlier designs is that typically whatever mechanism is utilized to open a closed valve, there is a mechanical interaction which simply introduces additional design complexity and the potential for failure. The present invention provides a novel and unobvious structure to create a “no filter-no run” fuel filter structure that overcomes many of the disadvantages with earlier designs.
A fluid filter centerpost assembly in combination with a fluid filter cartridge for creating a “no filter-no run” design according to one embodiment of the present invention comprises an oval-shaped design for the centerpost assembly and an oval-shaped design for a seal that is positioned between the centerpost assembly and the fluid filter cartridge. The centerpost assembly includes a main body having an oval shape in lateral cross section in unitary construction with a radial flange and interior shelf. The interior shelf defines a flow opening and a movable valve ball is positioned on the interior shelf and able to move in the direction of the flow opening due to incoming fluid pressure. The fluid filter cartridge includes a closed endcap with a blocking pin such that when the fluid filter cartridge is installed, the blocking pin is positioned to prevent the valve ball from closing off the flow opening.
One object of the present invention is to provide an improved fluid filter centerpost assembly and fluid filter cartridge combination.
Related objects and advantages of the present invention will be apparent from the following description.
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
The sidewall 31 of main body 22 defines an inlet flow opening 32 that is positioned just above the location where the interior shelf 24 is unitarily joined (i.e., molded) to the inside surface 33 of the main body 22. The interior shelf 24 defines a central flow opening 34 and a recessed track 35. The geometric center of flow opening 34 is concentric with the cylindrical main body 22 and coaxial with centerline 25. The valve ball 36 rides in the recessed track 35 and is movable across the upper surface of interior shelf 24 in response to incoming fuel flow. As would be understood, due to the inclined nature of shelf 24, valve ball 36 will naturally position itself between the interior shelf 24 and the inside surface of main body 22. The incoming fuel flow and the pressure from that flow is able to move the valve ball 36 toward the center of flow opening 34. The valve ball 36 is a molded plastic sphere and is designed to be light in weight such that virtually any fuel flow pressure is capable of moving the valve ball in the direction of flow opening 34. Further, the diameter selected for valve ball 36 is sufficiently large that it has very little distance to move to be in a position to actually close off flow opening 34. As indicated, this diameter size allows the valve ball to rest against inside surface 33 at the edge of flow opening 32 on one side and be adjacent flow opening 34 on the opposite side. If the valve ball 36 is actually allowed to move to the center of flow opening 34, the valve ball 36 is constructed and arranged to close off flow opening 34 such that fuel is unable to reach any downstream location for fuel utilization. What prevents the valve ball from closing off flow opening 34 is the presence of pin 37 which is an integral part of closed endcap 38. Pin 37 may alternatively be assembled into closed endcap 38 but, in either configuration, it is important that pin 37 extend coaxially with centerline 25 and extend in close enough proximity to flow opening 34, based upon the overall outside diameter of valve ball 36, so as to be able to prevent movement of the valve ball to a point that it could actually close off flow opening 34. It is actually the lower tip 42 of pin 37 that is positioned above but still in close proximity to flow opening 34. As such, even relatively slight movement of valve ball 36 in the direction of flow opening 34 results in abutment of the outer surface of valve ball 36 against pin 37, thereby stopping any further movement of valve ball 36. Pin 37 prevents the valve ball 36 from closing off flow opening 34 and thus this arrangement, as illustrated and described, means that as along as there is a proper fluid filter cartridge installed with pin 37 present, fuel will be permitted to flow to a downstream utilization site. However, without fluid filter cartridge 21 being installed onto centerpost assembly 20, there is nothing to prevent the closing off of flow opening 34 by valve ball 36. As described, once there is an incoming flow of fuel, the pressure of that flow readily moves valve ball 36 up the inclined shelf in the direction of flow opening 34, allowing the ball to seat and thereby close off flow opening 34. With flow opening 34 closed by valve ball 36, there is no path for the fuel to reach any downstream location.
With reference to
While the filtering media 44, centertube 45, and endcap 38 are circular or cylindrical in overall shape, it is important to note that elastomeric seal 47 is oval in shape, including an oval interior opening 47a. This in turn results in the open endcap 46 having a circular outside diameter (outer edge 48) and an oval or elliptical opening 49 centered on the axial centerline 25. The point of intersection of the major and minor axes of the oval shape coincides with axial centerline 25. The details of elastomeric seal 47 are illustrated in
With continued reference to
As illustrated in
While the cooperating and supporting structures have been described in the context of
Referring now to
There are fuel filter applications wherein the centerpost or centerpost assembly must be shortened and this alternative design is represented by centerpost assembly 60. However, the filter cartridge 61 must be modified to accept and cooperate with the shorter centerpost assembly. The filter cartridge includes a centertube 80 and molded as a unitary portion of centertube 80 is a dual-pin plug 81. Plug 81 is centered axially between opposite ends of filtering medial 63 and includes pin 82 extending in the direction of open endcap 65 and oppositely thereto pin 83 extending in the direction of closed endcap 64. Pins 82 and 83 are coaxial with longitudinal centerline 84. This longitudinal centerline 84 is coaxial with the longitudinal axes of filtering media 63, centertube 80, and filter cartridge 61. Consistent with the design and construction of centerpost assembly 20 and fluid filter cartridge 21, pins 82 and 83 are centered on the circular center of opening 85 defined by closing cap 70 and flow opening 75 defined by interior shelf 73.
The use of plug 81 allows pin 82 to function as described in connection with pin 37, without having to extend the increased length from closed endcap 64. Additionally, by using two pins oppositely arranged and centered axially, it does not matter which end of filtering medial 63 receives the closed endcap 64 and which end of the filtering media receives the open endcap 65 when creating the fluid filter cartridge 61. Either order of endcaps can be used and whichever end receives the open endcap, there will be a properly positioned and aligned pin for the centerpost assembly 60 when the fluid filter cartridge slides down over the oval centerpost assembly 60. Plug 81 is a molded plastic portion of centertube 80 and while either endcap can be used, the unitary centertube 80 can be assembled in either direction into filtering media 61.
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.
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|U.S. Classification||210/234, 210/457, 210/136|
|International Classification||B01D35/157, B01D35/147, B01D35/153, B01D29/21|
|Cooperative Classification||B01D2201/316, B01D29/21, B01D35/153, B01D2201/0415, B01D2201/4046, B01D2201/291, B01D2201/34|
|European Classification||B01D35/153, B01D29/21|
|Oct 26, 2012||FPAY||Fee payment|
Year of fee payment: 8
|Oct 26, 2016||FPAY||Fee payment|
Year of fee payment: 12