Abstract
A servicable draw and return tube assembly for use in fuel tanks is disclosed. The assembly may include a draw tube and a return tube secured to a plate, wherein the plate may be removably secured to a flange, which is fixedly secured to a fuel tank. The process of removably securing the plate to the flange allows for use of different sizes and materials to be utilized in manufacture of the assembly, thereby saving installation time and manufacturing costs.
Claims
1. A fuel tank, comprising: a fuel tank including a side wall having an aperture extending there through; a flange releasably secured on said fuel tank at said aperture and forming an airtight seal between said flange and said side wall around said aperture; and a plurality of fuel flow components releasably secured to said flange and extending into said aperture of said fuel tank.
2. The fuel tank of claim 1 wherein said plurality of fuel flow components are chosen from the group consisting of a fuel draw tube, a fuel return tube, a fuel sender unit, an auxiliary fuel draw tube, and a vent device.
3. The fuel tank of claim 1 further comprising a flexible seal positioned between said flange and said fuel tank side wall around said aperture, said flexible seal defining said airtight seal between said flange and said side wall.
4. The fuel tank of claim 1 wherein said flange is secured to said fuel tank by a plurality of threaded fasteners.
5. The fuel tank of claim 1 wherein at least one of said plurality of fuel flow components is releasably secured to said flange with a barbed fitting.
6. The fuel tank of claim 1 wherein said fuel tank and said flange are manufactured of metal and at least one of said plurality of said fuel flow components is manufactured of plastic, said plastic component releasably secured to said flange with a snap fitting.
7. The fuel tank of claim 1 wherein said flange includes a bracket secured thereto, said bracket extending through said aperture of said fuel tank and into an interior of said fuel tank, said bracket supporting at least one of said plurality of said fuel flow components against movement within said fuel tank interior.
8. The fuel tank of claim 1 wherein said flange includes a flange aperture extending there through, said flange aperture including a plurality of fastener apertures positioned there around, and wherein one of said plurality of fuel flow components is positioned within said flange aperture and extending through said aperture of said fuel tank, said one of said plurality of fuel flow components releasably secured to said flange by fasteners secured within said fastener apertures.
9. The fuel tank of claim 8 further comprising a flexible seal positioned between said one of said plurality of fuel flow components and said flange around said flange aperture, said flexible seal defining said airtight seal between said one of said plurality of fuel flow components and said flange.
10. A method of installing a draw and return tube assembly, comprising: providing a fuel tank including a side wall having an aperture extending there through; releasably securing a flange on said fuel tank at said aperture such that said flange forms an airtight seal between said flange and said side wall around said aperture; and releasably securing a plurality of fuel flow components to said flange such that each of said plurality of said fuel flow components extends into said aperture of said fuel tank.
11. The method of claim 11 wherein at least one of said plurality of said fuel flow components is manufactured of plastic by the process of extrusion.
12. The method of claim 11 wherein at least one of said plurality of said fuel flow components is snap fit into releasable airtight securement on said flange.
13. The method of claim 11 further comprising securing a bracket to said flange, said bracket extending through said aperture of said fuel tank and into an interior of said fuel tank, said bracket securing at least one of said fuel flow components against movement within said interior of said fuel tank.
14. The method of claim 11 further comprising removing said flange from securement on said fuel tank so as to access one of said plurality of said fuel flow components.
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Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a top view of a flange to which a serviceable draw and return tube assembly may be removably secured.
[0011] FIG. 2 is a side view of the flange of FIG. 1.
[0012] FIG. 3 is an end view of a serviceable draw and return tube assembly.
[0013] FIG. 4 is a side view of the assembly of FIG. 3.
[0014] FIG. 5 is a top view of the assembly of FIG. 3.
[0015] FIG. 6 is a top view of a plate of a serviceable draw and return tube assembly.
[0016] FIG. 7 is a cross sectional side view of the plate of FIG. 6 taken along line E-E of FIG. 6.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] The invention discloses a draw and return tube assembly that is intended for use on commercial vehicles, although it may be used with any internal combustion engine connected to a fuel tank utilizing a draw and return tube assembly.
[0018] FIG. 1 is a top view of a flange 10 to which a serviceable draw and return tube assembly 12 (FIG. 3) may be removably secured. Flange 10 may be fixedly secured to a fuel tank 14 such as by a weld 16 or other securement structure. This weld step may take place before a serviceable draw and return tube assembly may be secured to flange 10. Weld 16 generally will extend completely around a perimeter 18 of flange 10 so as to define an air tight and a liquid tight seal between tank 14 and flange 10. Only a portion of weld 16 is shown in this view of ease of illustration. In the embodiment shown, flange 10 defines a central aperture 20 that extends completely through flange 10 and defines a diameter 22 of 3.587 inches (in). Positioned around central aperture 20 is an arrangement of securement apertures 24, arranged in a circle 26 that defines a diameter 28 of 4.114 in. Securement apertures may be internally threaded and may be arranged so as to receive fasteners to secure a serviceable draw and return tube assembly 12 (FIG. 3) thereto. In the embodiment shown, flange 10 includes 10 securement apertures 24, but in other embodiments, other arrangements and numbers of securement apertures, or other securement means, may be utilized.
[0019] FIG. 2 is a side view of the flange 10 of FIG. 1. In this embodiment flange 10 includes a central, generally flat region 30 which includes central aperture 20 and which defines a diameter 30 of 4.65 in. An outer region 32 of flange 32 defines an angle 34 with respect to flat region 30 of flange 10. In particular, in the embodiment shown, outer region 32 defines a curvature having a radius 36 of 11.02 in, which may mate with an outer surface of fuel tank 14. Fuel tank 14 may include an aperture aligned with central aperture 20 such that a serviceable draw and return tube assembly 12 (FIG. 3) positioned within central aperture 20 will also be placed through an aperture in fuel tank 14 and into and interior 38 of the fuel tank.
[0020] FIG. 3 is an end view of a serviceable draw and return tube assembly 12. In this embodiment, assembly 12 includes a flat, circular plate 40 that defines an arrangement of securement apertures 42 that may correspond in placement to securement apertures 24 of flange 10. Fasteners 44, such as threaded screws or bolts may be utilized to secure plate 40 to flange 10. In an embodiment wherein the securement apertures 24 of flange 10 (FIG. 1) are not internally threaded, fasteners 44 may comprise self tapping fasteners or the like. A seal 46, such as a washer shaped cork gasket, only a portion thereof shown for ease of illustration, may be positioned between flange 10 and plate 40 to ensure an air tight and a liquid tight seal there between.
[0021] Plate 40 may further include first and second tube apertures 48 and 50 for securement of a draw tube 52 and a return tube 54, respectively, therein. Plate 40 may further include a third aperture 56 extending there through for securement of a vent device therein, and a fourth aperture 58 extending there through for securement of a fuel sending unit therein, for example. Fourth aperture 58 may include an arrangement of five securement apertures 60 extending there around for removable securement of a fuel sending unit thereto. First, second, third and fourth apertures 48, 50, 56 and 58, and securement apertures 60, normally will all be positioned within an interior radial position of plate 40 such that components secured within these apertures will extend through, and not interfere with, central aperture 20 of flange 10 or an aperture in fuel tank 14. In another embodiment a fuel sending unit may be fixedly secured to plate 40 or a fuel sending unit may be manufactured as an integral component of plate 40. In still other embodiments, other apertures or other types of securement structures may be positioned within or on plate 40 for securing other structures, such as one or more auxiliary fuel draw tubes for use with truck mounted auxiliary fuel fired heaters, generators, refrigeration units, and the like.
[0022] FIGS. 4 and 5 are a side view and a top view, respectively, of the assembly 12 of FIG. 3. Assembly 12 further includes a stabilizing bracket 62 that may be secured to an underside 64 of plate 40 and which may include two apertures 66 through which draw and return tubes 52 and 54 extend. A stabilizing bracket may be utilized in such a serviceable draw and return tube assembly 12 because, due to the removable connection between plate 40 and flange 10, instead of prior art securement mechanisms such as welding, tubes 52 and 54 may be manufactured with a thinner tube wall thickness than previously utilized. In other words, because tubes 52 and 54 need not withstand the harsh environment of a welding step, thinner walled tubing may be utilized, which may warrant use of stabilizing bracket 62. Due to the removable connection between plate 40 and flange 10, instead of prior art securement mechanisms such as welding, tubes 52 and 54 may be secured to connectors 68 and 70 on plate 40 by an adhesive 72, instead of a welding step, and connectors 68 and 70 may include on a top side 74 of plate 40 a single external lip 76 for connection to fuel hoses by use of a quick disconnect attachment. Moreover, due to the elimination of the welding step of a plate to a flange, molded plastic draw and return tubes 52 and 54 may be utilized, instead of the prior art requirement of rigid metal tubing. In an embodiment wherein tubes 52 and 54 are manufactured of a plastic material, the plastic tubes may be connected to connectors 68 and 70 by integral barbed fittings, or connectors 68 and 70 may themselves be barbed fittings which may allow attachment of tubes 52 and 54 thereto, as well as attachment of fuel hoses thereto on an opposite side of plate 40. In such an embodiment, adhesive may not be utilized to secure the tubes 52 and 54 to the connectors 68 and 70. Similarly, due to the elimination of the welding step of a plate to a flange, a plastic securement device, such as an adhesive or a zip tie 78, may be utilized at a lower end region of draw and return tubes 52 and 54, at which the tubes cross one another, to secure the tubes against movement during operation of the vehicle to which the assembly 12 is installed.
[0023] FIG. 6 is a top view of a plate of a serviceable draw and return tube assembly.
[0024] FIG. 7 is a cross sectional side view of the plate of FIG. 6 taken along line E-E of FIG. 6. In FIG. 7, connectors 68 and 70 are shown including a barbed fitting to which a plastic tube, such as draw tube 52, may be secured by a simple press or snap fit operation, i.e., the tube is pushed into engagement with barbs 80 of connectors 68 or 70. Plate 40 may be manufactured of a sturdy material such as a metal, including steel or aluminum, for example, or of a rigid plastic or composite material. Use of barbed fittings for connectors 68 and 70 allows for the quick connection of plastic tubes, which are relatively inexpensive to manufacture. Moreover, the quick connect barbed fitting, which allows for a simple press or snap fit of the plastic tubes on the barbs 80, decreases the manufacturing time for fully assembling serviceable draw and return tube assembly 12 Moreover, use of barbs 80 on connectors 68 and 70 may eliminate the need for welding tubes 52 and 54 to plate 40, thereby eliminating the need for providing a thickness of material of plate 40 and connectors 68 and 70 that can withstand the harsh temperatures and environment of a welding operation. Accordingly, plate 40 and connectors 68 and 70 may be manufactured with a relatively thin thickness of material, compared to prior art assemblies, thereby saving material costs in the manufacture of assembly 12. Barbed connectors 68 and 70 also allow for simple changing of tubes 54 and/or 52 during servicing if the need arises.
[0025] Still referring to FIG. 7, external lips 76 of connectors 68 and 70 allow for a quick connect press or snap fit of a fuel hose to external lips 76 of connectors 68 and 70, opposite plate 40 from barbed connections 80. Such a press or snap fit external lip design, wherein a hose is connected to external lips 76, may eliminate the need for a thickness of metal at connectors 68 and 70, which may be required in a design when a threaded connection is utilized to secure a fuel hose to plate 40 opposite from barbed connections 80.
[0026] In the above description numerous details have been set forth in order to provide a more through understanding of the present invention. It will be obvious, however, to one skilled in the art that the present invention may be practiced using other equivalent designs.
