Patent Description:
Compressed natural gas (CNG) is an alternative fuel that provides many advantages. CNG fuels burn cleaner than other combustion fuels. CNG also can be more cost effective.

CNG fuel systems can come in several forms. One form employs a Type IV fuel tank constructed with a polymeric liner. Carbon fiber wrapped around the liner can reinforce the liner, to produce a fuel tank strong enough for use on heavy-duty trucks and other vehicles. The fuel tank can have a boss disposed at one or more ends for sealing the end portion(s) of the fuel tank. The boss can provide access to the fuel tank for filling and dispensing the fuel contained therein. The fuel tank can be integrated into a fuel system that includes a frame to support the fuel tank. The frame can support the fuel tank on a side or lateral portion of a vehicle, behind the cab of the vehicle, on a rooftop of the vehicle, or at another location. Some fuel tanks can be supported at one or both ends at the bosses.

<CIT> describes a floating bearing for a compressed gas container with at least one cylindrical receiving area for the floating bearing, with a bearing shell which is designed to enclose the receiving area with an inner surface, which is movable in the axial direction relative to the receiving area, and which has a spherical outer surface, with a bearing block and a receptacle between the bearing block and the outer surface of the bearing shell, wherein an inner surface of the receptacle has a shape corresponding to the spherical outer surface of the bearing shell.

<CIT> describes structures for securing a fluid containment cylinder at the neck portion of the cylinder that include a mounting frame having a bore disposed therein and a slot disposed orthogonally to the central axis of the bore.

Fuel tanks that are supported at one or more bosses can be subject to wear at the interface between the boss and the support. For example, in some cases it is observed that the fuel tank can expand and contract by small but significant amounts in a lengthwise direction. The expansion and contraction can be due to conditions such as the level of pressure in the tank, the temperature of the tank, the ambient temperature and other surrounding environmental conditions, or loading of the fuel tank. The expansion and contraction can cause relative sliding motion that can result in wear on the fuel tank, e.g., on a surface of the boss. While the fuel tank can be configured for a long service life accounting for wear, it would be an advantage to reduce fuel tank wear for a number of reasons, such as reducing maintenance and repair costs and preventing sudden material failure.

In one embodiment, a fuel system is provided that includes a tank, a mounting assembly, a first bearing block, and a second bearing block. The tank has a first boss at one end and a second boss. The second boss is located at an end of the tank opposite the first boss. The mounting assembly is configured to be coupled to a support. For example, the mounting assembly can be directly coupled to a vehicle, such as to a frame rail or can be indirectly coupled to a frame rail or a chassis portion of a vehicle by one or more other brackets or structural members. The mounting assembly can be configured to be coupled to a trailer or a stationary storage facility. The first bearing block is coupled to the mounting assembly. The first bearing block has a first inner portion comprising a first tank support surface and a wiper disposed adjacent to the first tank support surface. The second bearing block is coupled to the mounting assembly. The second bearing block has a second inner portion comprising a second tank support surface. The first bearing block being coupled to an outer surface of the first boss at the first tank support surface to form a first support connection. The second bearing block being coupled to an outer surface of the second boss at the second tank support surface to form a second support connection. The first and second support connections support the tank on the mounting assembly. The first bearing block allow the first boss to move relative to the first tank support surface while the tank is coupled to the mounting assembly. The wiper prevents debris from entering a space disposed between the first tank support surface and the first boss when the first boss move relative to the first support surface.

In another embodiment, a fuel system is provided that includes a mounting block assembly configured to support an end of a fuel tank. The end of the fuel tank has a boss. The mounting block assembly has a first portion and a second portion. The second portion is separable from the first portion. The first portion and the second portion enclose a space configured to receive the boss of the fuel tank. The fuel system also includes a bearing disposed in the space. The bearing has a support surface configured for sliding support of the boss of the fuel tank at an interface between the first portion and the second portion of the mounting block assembly. The bearing has an inboard facing surface. The inboard facing surface faces the end of the fuel tank when the fuel tank is supported by the mounting block assembly. The bearing has a wiper disposed adjacent to the support surface.

In another embodiment, a neck mount support assembly is provided that includes a mounting block assembly that is configured to support an end of a fuel tank. The end of the fuel tank has a boss. The mounting block assembly has a first portion and a second portion separable from the first portion. The first portion and the second portion enclose a space configured to receive the boss of the fuel tank. A bearing is disposed in the space. The bearing has a support surface configured for sliding support of the boss of the fuel tank at an interface. The mounting block has a wiper disposed adjacent to the support surface of the bearing. The wiper is configured to limit debris from entering the interface between the support surface and the boss.

In another embodiment a neck mount support assembly is provided that includes a mounting block and an end cap. The mounting block can be configured to support an end of a fuel tank, e.g., an end having a boss. The mounting block has a first portion and a second portion separable from the first portion. The first portion and the second portion enclose a bearing support space configured to receive the boss of the fuel tank. A bearing can be or is disposed in the bearing support space. The bearing has a support surface configured to support the boss of the fuel tank at an interface. The endcap can be connected to an outboard side of the mounting block opposite the side of the mounting block configured to face the fuel tank. The endcap can be configured to limit debris from entering the interface between the support surface and the boss.

In one variation, the neck mount support assembly can include a debris exclusion component on an inboard side of the mounting block facing the fuel tank. The debris exclusion component can include a cover. The cover can be connected to a first side of the mounting block. The first side can be the inboard side of the mounting block. The cover can be configured to limit debris from entering the interface between the support surface and the boss.

A cover, if provided, can span a length of the boss between the mounting block and the fuel tank enclosure. The cover can be secured to an outer surface of the fuel tank assembly.

A debris exclusion component on an inboard side of the neck mount support assembly can include a wiper disposed in mounting block, e.g., between the bearing and the boss. The wiper can be used alone or in combination with a cover that can cooperate to exclude debris from entering the interface between the bearing and the boss.

The abovementioned and other features of the invention disclosed herein are described below with reference to the drawings of the preferred embodiments. The illustrated embodiments are intended to illustrate, but not to limit the invention. The drawings contain the following figures.

This application is directed to reducing ingress of debris, such as sand, dust and grit, into an interface that is provided between an outside surface of a neck portion of a fuel tank and a surface applying a load to the outside surface. The outside surface may be a cylindrical surface of a boss and the load applying surface may be a bearing or a component of a mounting block or mounting block assembly configured to support at least a portion of the weight of the tank. The ingress of such matter can produce wear at the neck portion of the fuel tank. Neck portion wear can lead to accelerated wear of the fuel tank or fuel system in which the tank is integrated, and/or to maintenance concerns of the fuel tank and/or fuel system. The incidence and severity of these outcomes can be reduced or eliminated by embodiments disclosed herein.

<FIG> and <FIG> illustrate environments in which embodiments herein can be deployed. In one example, a fuel system <NUM> can be coupled with a vehicle <NUM> to provide the fuel needs therefor. In various embodiments, a vehicle <NUM> may refer to any mobile machine or device, including trailers and other towable assemblies, designed or used to transport passengers or cargo, including fuel. Examples of a vehicle may include cars, trucks, buses, trains, ships, boats, aircrafts and other types of vehicles as well as trailer and other component that can be towed by or coupled to any of the foregoing. More generally, the fuel system <NUM> could be part of a stationary facility for storage of fuel and/or for refueling a fleet. The vehicle <NUM> in <FIG> is a tractor-trailer. Classes of trucks that could benefit from the disclosed improvements herein include a light duty trucks (e.g., class <NUM>, class <NUM> or class <NUM>), medium duty trucks (e.g., class <NUM>, class <NUM> or class <NUM>), or heavy duty trucks (e.g., class <NUM> or class <NUM>). Passenger vehicles, including cars, wagons, vans, buses, high-occupancy vehicles could employ the disclosed improvements as well. The vehicle <NUM> can be any vehicle, as discussed above, but is illustrated as a tractor-trailer with a cab <NUM> and a detachable portion <NUM>, i.e., the trailer. The fuel system <NUM> is disposed between the cab <NUM> and the detachable trailer <NUM> but could be in other locations in other fuel systems. The connection to the vehicle <NUM> can be by way of mounting brackets <NUM> disposed on a lower portion of the fuel system <NUM>. The fuel system <NUM> can include one or a plurality of fuel tanks <NUM> disposed in an enclosure <NUM>. The fuel tanks <NUM> may be of any size, capacity, shape and/or weight and may be made of any suitable material. For example, the fuel tanks <NUM> may have a shape that is substantially cylindrical, rectangular, spherical, or the like. In addition, the fuel tank(s) <NUM> may be used to store any type(s) of fuel such as gaseous fuels (e.g., compressed natural gas) or a liquid (e.g., diesel). For example, gaseous fuels may include hydrogen or hydrogen based gas, hythane, H2CNG, or any other gas. The enclosure <NUM> can be mounted to a structure, e.g., to a support frame of the fuel system <NUM>.

In one embodiment, the fuel system <NUM> includes a mounting assembly <NUM> that can include or be supported by a frame <NUM>. The mounting assembly <NUM> can include a block member(s) that receives and retains one or more boss members of the fuel tank <NUM>. The mounting assembly <NUM> can be coupled to the mounting brackets <NUM>, e.g., by the first boss <NUM> or by other frame members between the frame <NUM> and the mounting brackets <NUM>.

<FIG> and <FIG> show details of how the fuel tank <NUM> can be supported by the mounting assembly <NUM> and/or the frame <NUM> and/or block members as discussed further below. The fuel tank <NUM> includes a first end 52A and a second end 52B. A cylindrical portion is disposed between the first end 52A and the second end 52B. The cylindrical portion can account for the majority of the volume of the fuel tank <NUM>. The ends of the fuel tank <NUM> can be enclosed by hemispherical dome members at the first end 52A and the second end 52B. A first boss <NUM> can be disposed at the first end 52A. A second boss <NUM> can be disposed at the second end 52B. Each boss can have an outer surface, e.g., the first boss <NUM> can have an outer surface <NUM> that is exposed and that is coupled to the mounting assembly <NUM> as discussed below.

<FIG> schematically shows how a fixed bearing block assembly <NUM> can be integrated into the mounting assembly <NUM> to support the fuel tank <NUM> at the second boss <NUM>. The fixed bearing block assembly <NUM> can include a rigid block member <NUM>. In one embodiment the fixed bearing block assembly <NUM> includes a two part assembly that includes two rigid block members <NUM>. A first rigid block member <NUM> is disposed generally above the second boss <NUM> when applied and a second rigid block member <NUM> is disposed generally below the second boss <NUM>. The two rigid block members <NUM> can be identical, such that each provides one half of an inner periphery <NUM> configured to be disposed about the second boss <NUM>. In some embodiments the first and second rigid block members <NUM> have a "C" shape profile when separated. The "C" shape refers to one or each of the block members <NUM> having a convex surface, such as one-half or a portion of the inner periphery <NUM> and also having external sides disposed about the inner periphery <NUM> or portion thereof. Each block member <NUM> can have a first side or portion 68A of an outer periphery thereof disposed opposite the inner periphery <NUM>. Each block member <NUM> can have a second 68B and third side 68C disposed opposite of each other and at opposite ends of the first side 68A. The two rigid block members <NUM> can be similar or identical such that each provides a similar or identical outer periphery configured to be secured to the frame <NUM> or other supporting structure within the mounting brackets <NUM> of the fuel system <NUM>. Apertures in the outer periphery of the rigid block member(s) <NUM> can allow bolts or other fasteners to secure the two or more rigid block members <NUM> together. In another embodiment, the fixed bearing block assembly <NUM> is a single member with an aperture in a center thereof providing the inner periphery <NUM>.

The inner periphery <NUM> can be provided with a boss engaging feature <NUM>, which can be one or a plurality of inner threads <NUM>. The inner threads <NUM> can be configured to mate with the second boss <NUM> to limit, reduce or eliminate relative movement between the second boss <NUM> and the fixed bearing block assembly <NUM>. In one case, the second boss <NUM> comprises one or a plurality of outer threads <NUM> that can mate with the boss engaging feature <NUM>, e.g., with the inner threads <NUM>. In one case, the inner threads <NUM> are female threads and the outer threads <NUM> are male threads. In another case, the inner threads <NUM> are male threads and the outer threads <NUM> are female threads. In various embodiments, the shape and dimensions (e.g., diameter, length) of the inner periphery <NUM> may be configured to secure or protect the second boss <NUM>. For example, where the cross-section of the second boss <NUM> is a circle, the shape of the inner periphery <NUM> may also be circular. In other embodiments the cross-intersection of the second boss <NUM> is a rectangle and the shape of the inner periphery <NUM> may resemble a rectangle.

As noted above, the fuel tank <NUM> can be somewhat expanded when under pressure in part due to the materials used to form the fuel tank <NUM>. In some cases, a longer lasting fuel system <NUM> results from permitting the fuel tank <NUM> to expand while holding the fuel tank <NUM> in the fuel system <NUM>. In one embodiment, a first bearing block assembly <NUM> is provided that is configured to permit some movement between the first boss <NUM> and an inner periphery <NUM> configured to be disposed around the first boss <NUM>. The inner periphery <NUM> provides a bearing support space for supporting a bearing which actually contacts the first boss <NUM> as discussed further below. The first bearing block assembly <NUM> can be configured to be supported in the enclosure <NUM>, e.g., being coupled with the mounting brackets <NUM> directly or through the frame <NUM>.

<FIG> shows that the first bearing block assembly <NUM> can include a first block portion 92A and a second block portion 92B. The block portions 92A, 92B can be separable in a manner similar to the rigid block member <NUM> of the fixed bearing block assembly <NUM>. The first block portion 92A can be lifted off of the second block portion 92B to provide access to an inner periphery <NUM> of the block portions 92A, 92B. The inner periphery <NUM> can be shaped and sized (e.g., diameter, length) in a variety of different ways. For instance, the inner periphery <NUM> can be circular, triangular, rectangular, pentagonal, hexagonal and octagonal. The inner periphery <NUM> can be shaped in many other configurations other than those previously listed. A bearing assembly <NUM> can be placed in the inner periphery <NUM> to provide support for the first boss <NUM>. In some embodiments, a second bearing assembly <NUM> similar to the first bearing assembly <NUM> can be provided on the second boss <NUM>. The first bearing assembly <NUM> can be secured in the inner periphery <NUM> in any suitable manner, such as by being received in a channel therein. In some embodiments, the bearing assembly <NUM> can be secured in place by a fastener, pin and key, latch, or other connector. In other embodiments, the bearing assembly can be secured in place through a more permanent method, such as through welding or bonding. In various embodiments, the shape and dimensions (e.g., diameter, length) of the bearing assembly <NUM> may be configured to secure to the inner periphery <NUM>. For example, where the intersection of the inner periphery <NUM> is a circle, the shape of the bearing assembly <NUM> may resemble a circle. Where the intersection of the inner periphery <NUM> is a rectangle, the shape of the bearing assembly <NUM> may resemble a rectangle.

This connection can be more fully appreciated with reference to <FIG> in which the first bearing assembly <NUM> is shown positioned over the first boss <NUM>. The first bearing assembly <NUM> can be seen to have a convex outer surface <NUM>. The convex outer surface <NUM> can be convex in direction seen in a cross-section transverse, e.g., perpendicular to the opening through the first bearing assembly <NUM>, as shown in <FIG>. The convex surface can be received in a corresponding concave channel formed in the inner periphery <NUM> of the first bearing block assembly <NUM>. <FIG> shows that a first support connection <NUM> is provided between the outer surface <NUM> of the first boss <NUM> and a first inner portion <NUM> of the first bearing assembly <NUM>.

<FIG> show the first bearing assembly <NUM> in more detail. The first bearing assembly <NUM> includes an aperture at the first inner portion <NUM>. The aperture is sized to receive the outer surface <NUM> of the first boss <NUM>. The aperture can allow a sliding connection to be formed in the first inner portion <NUM>. The first inner portion <NUM> can include a first tank support surface <NUM>. The first tank support surface <NUM> is configured for sliding support of the first boss <NUM> of the fuel tank <NUM> at an interface there between. The first tank support surface <NUM> can be a generally flat surface, e.g., forming a cylindrical portion that can be larger than the outer diameter of the outer surface <NUM> of the first boss <NUM>. The first tank support surface <NUM> can be smooth, with a surface roughness value of anywhere between <NUM> micrometers to <NUM> micrometers, including about <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM> micrometers. In some embodiments, the first tank support surface <NUM> contains bearings, such as a sleeve bearing, ball bearings or another suitable bearing. These bearings can be arranged in a ring or sleeve pattern on the first tank support surface <NUM>.

The first tank support surface <NUM> can at least, in part, define a space <NUM> that is inward of the first tank support surface <NUM>. The space <NUM> can be disposed between the first tank support surface <NUM> and the outer surface <NUM> of the first boss <NUM>. The space <NUM> can be or can include a portion of an interface between the fuel tank <NUM> and the first bearing block assembly <NUM>. The space <NUM> can benefit from the addition of a mechanism to exclude dirt, debris or other matter from the interface. By excluding such matter, the first bearing block assembly <NUM> and the fuel system <NUM> can have a longer service life, particularly in dirty environments in which heavy duty vehicles are used.

In one embodiment, the first bearing assembly <NUM> includes a wiper <NUM>. The wiper <NUM> can be a first wiper <NUM> where the first bearing assembly <NUM> also includes a second wiper <NUM>. The first wiper <NUM> can be an inboard wiper, e.g., one that is positioned between the space <NUM> and the cylindrical portion of the fuel tank <NUM>. The first wiper <NUM> can be an outboard wiper, e.g., one that is positioned such that the block portions 92A, 92B are disposed between the first wiper <NUM> and the cylindrical portion of the fuel tank <NUM>. The first wiper <NUM> can be outboard in the sense of being more laterally located on the fuel system <NUM>.

The first wiper <NUM> and/or the second wiper <NUM> can be integrated into the first bearing assembly <NUM> in convenient manner such that they can be installed together with the first tank support surface <NUM>, which is the surface that the outer surface <NUM> of the first boss <NUM> can rest upon. In one embodiment, the first bearing assembly <NUM> includes a ring member 100A that extends between the convex outer surface <NUM> and the first tank support surface <NUM>. The ring member 100A can include a continuous monolithic structure from the convex outer surface <NUM> to the first tank support surface <NUM>. The ring member 100A can be formed of a strong, substantially incompressible material. The ring member 100A can include a low friction material, at least adjacent to or at the first tank support surface <NUM>. Some materials that can form the ring member 100A can include, for instance, metal (e.g., aluminum or steel), metal alloy (e.g., aluminum alloys), carbon fiber reinforced plastic, or a plastic material. The ring member 100A can be manufactured using a variety of different materials and methods. The ring member 100A may be made by any suitable process, such as, for instance, machining, milling, water jet cutting, laser cutting, stamping, pressing, sheet metal drawing, molding (e.g., injection molding), casting, rapid prototyping using additive manufacturing techniques, or any combination thereof. The ring member 100A can provide a first recess <NUM> disposed on a side surface thereof. The first recess <NUM> can be formed in the material of the ring member of the first bearing assembly <NUM> between the first tank support surface <NUM> and a lateral surface of the ring member 100A. A lateral surface in this context can be disposed in a plane perpendicular to an axis A through the first bearing assembly <NUM>. The first recess <NUM> can correspond to an annular recess disposed between the material forming the first tank support surface <NUM> and the lateral edge of the ring member 100A of the first bearing assembly <NUM>. The first wiper <NUM> can be installed in the first recess <NUM>.

In one embodiment, the first wiper <NUM> has one or more, e.g., two faces that can be secured to the first recess <NUM>. Any suitable approach can be provided to secure the first wiper <NUM> in the first recess <NUM>. For example, an adhesive can be used to secure a first face of the first wiper <NUM> to a surface of the first recess <NUM>. An adhesive can be used to secure a second face of the first wiper <NUM> to a surface of the first recess <NUM>. When secured in the first recess <NUM>, a free end of the first wiper <NUM> can be disposed in an opening through the first bearing assembly <NUM> that includes the space <NUM> disposed between the first tank support surface <NUM> and the axis A. For example, a free end of the first wiper <NUM> can be suspended at or adjacent to a lateral face of the ring member 100A of the first bearing assembly <NUM>. The free end can comprise a free circumferential edge of the first wiper <NUM>. The free end of the first wiper <NUM> can flare at least partially into the opening within the first bearing assembly <NUM>. The free end of the first wiper <NUM> can flare toward the axis A and away from the first recess <NUM>.

In some embodiments, the first wiper <NUM> can be resilient in structure or material. In some embodiments, the first wiper <NUM> can be made from a material, including rubber, silicone, metal, cork, neoprene, nitrile rubber, fiberglass, PTFE, plastic, or any combination thereof. The first wiper <NUM> can be manufactured by any suitable process, such as, for instance, machining, milling, water jet cutting, laser cutting, stamping, pressing, sheet metal drawing, molding (e.g., injection molding), casting, rapid prototyping using additive manufacturing techniques, or any combination thereof. The first wiper <NUM> can be configured such that a portion thereof, e. g, the free end thereof, can be disposed or urged toward the axis A in at least one configuration. The first wiper <NUM> can include a rubber ring member <NUM>. The rubber material of the rubber ring member <NUM> can be springy or resilient such that upon being compressed the first wiper <NUM> applies a resisting force against the structure compressing the rubber ring member <NUM>. In one case, the rubber ring member <NUM> includes an outer periphery <NUM> secured in the first recess <NUM> and an inner periphery <NUM> disposed toward the axis A. The outer periphery <NUM> can be disposed in a free state 126A toward the axis A by a first amount. The outer periphery <NUM> can be disposed in compressed state 126B toward the axis A by a second amount. The second amount can be less than the first amount, as shown in, for example, <FIG>. In some cases, the first wiper <NUM> is itself resilient. In other cases, a spring or other resilient member <NUM> can be disposed between the ring member of the first bearing assembly <NUM> and the first wiper <NUM> such that the first wiper <NUM> can be stiff but the resilient member <NUM> can act to press the first wiper <NUM> against the outer surface <NUM> of the first boss <NUM>.

As discussed above, the first bearing assembly <NUM> can include a second wiper <NUM> in some cases. If provided, the second wiper <NUM> can be of a similar configuration as the first wiper <NUM>. The second wiper <NUM> can be a mirror image configuration such that an outer periphery <NUM> thereof flares toward the axis A. The second wiper <NUM> can include or be configured as a rubber ring member. The material of the rubber ring member can be resilient to press against a portion of the outer surface <NUM> of the first boss <NUM> spaced away from the location of the first wiper <NUM>. Thus, a first bearing assembly <NUM> with both the first wiper <NUM> and the second wiper <NUM> can be equipped to exclude matter, e.g., dirt and grit, from the first support connection <NUM>, e.g., from the space <NUM> forming the interface between the first boss <NUM> and the first bearing assembly <NUM>. A first bearing assembly <NUM> with both the first wiper <NUM> and the second wiper <NUM> can be equipped to exclude matter from the contact point between the first boss <NUM> and the supporting structure of the fuel tank <NUM> within the fuel system <NUM>.

The first bearing block assembly <NUM> provides convenience in assembling the fuel system <NUM> including the first bearing block assembly <NUM>. For example, the separability of the first block portion 92A from the second block portion 92B enables the first bearing assembly <NUM> to be inserted into the inner periphery <NUM> in the space between the block portions 92A, 92B. When separated, the first and second block portions 92A, 92B have a "C" shape profile. The "C" shape refers to the first and second block portions 92A, 92B having a first side facing away from the inner periphery <NUM> with a second side and a third side disposed opposite to each other and at opposite ends of the first side, similar to the block members <NUM> discussed above. This structure allows the ring member of the first bearing assembly <NUM> to be continuous which provides a more rigid structure. A continuous solid structure ring member can be more easily handled and may be more rugged with a longer service life.

<FIG> shows another embodiment of a bearing block assembly <NUM> that provides other advantages. The assembly of <FIG> can be the same as the assembly of <FIG> except as described differently below. The first bearing block assembly <NUM> has a monolithic block component <NUM>. The fuel system <NUM> can be formed by including the first bearing block assembly <NUM>, e.g., by supporting the first bearing block assembly <NUM> with the frame <NUM>. The block component <NUM> can include an outer periphery <NUM> coupled to the frame <NUM>. The block component <NUM> can include an inner periphery <NUM> configured to be disposed around the first boss <NUM>. The inner periphery <NUM> can be sized to surround the outer surface <NUM> of the first boss <NUM> while also providing a space for a support connection <NUM>. The support connection <NUM> can include a first inner portion <NUM> that can comprise an assembly. The first inner portion <NUM> can include a bearing assembly <NUM> that can include a ring member <NUM> that has a seam <NUM> that facilitates placement of the first inner portion <NUM> within the inner periphery <NUM>. The inner periphery <NUM> can include a concave channel that can receive a convex outer surface of the ring member <NUM> of the bearing assembly <NUM>. The convex outer surface can be similar to the convex outer surface <NUM> of the first bearing assembly <NUM>. The convex outer surface can be split at least at one location such that the ring member <NUM> of the bearing assembly <NUM> can be inserted into the inner periphery <NUM>. The bearing assembly <NUM> can include one or more of the first wiper <NUM> and the second wiper <NUM>. <FIG> shows that ring member <NUM> can be coupled with both the first wiper <NUM> and the second wiper <NUM>.

The integration of the first wiper <NUM> and/or the second wiper <NUM> into the ring member <NUM> of the bearing assembly <NUM> can be similar to that of the first bearing assembly <NUM>. For example, one or more of the first recess <NUM> and the second recess <NUM> can be provided in the ring member <NUM>. The first wiper <NUM> and/or the second wiper <NUM> can be coupled with the recesses in a suitable manner, e.g., by an adhesive connection to one or more surfaces of the recesses.

The first bearing block assembly <NUM> can be incorporated into fuel system assembly similar to the fuel system <NUM>. The continuous uninterrupted configuration of the block component <NUM> provides more rigid support for the first boss <NUM> in some configurations. Also, the assembly of the fuel system <NUM> including the first bearing block assembly <NUM> is simplified in not requiring the connection of two separate block components.

In some embodiments, the fuel system <NUM> includes a bellows assembly <NUM>. A bellows assembly <NUM> can include two clamps <NUM> and a sheath or cover <NUM>. The cover <NUM> extends from one clamp <NUM> to the other, forming a hollow center <NUM>. The clamp <NUM> can attach the bellows assembly <NUM> to the fuel tank <NUM> and the bearing block <NUM>, <NUM>, <NUM>. The clamps <NUM> attach the bellows assembly <NUM> to the fuel tank <NUM> or bearing block <NUM>, <NUM>, <NUM> by exerting a clamping force at a connecting point <NUM>. The connecting point <NUM> can be a ferrule or lip on the fuel tank <NUM> and/or bearing block <NUM>, <NUM>, <NUM>. In some embodiments, there is no connecting point <NUM> and the clamps <NUM> connect directly to the first or second boss <NUM>, <NUM>. The bellows assembly <NUM> can simultaneously connected to two connecting points <NUM>, such as the connecting point <NUM> attached to fuel tank <NUM> and the connecting point <NUM> attached to the bearing block <NUM>, <NUM>, <NUM>. In <FIG>, the cover <NUM> covers a section of the first boss <NUM> that extends between the fuel tank <NUM> and the bearing block <NUM>, <NUM>, <NUM>.

In some embodiments, the bellows assembly <NUM> includes two latches instead of two clamps <NUM>. In some embodiments, the clamps <NUM> are configured as ratcheting members, similar to a hose clamp. In some embodiments, the cover <NUM> is made from flexible material, such as natural or synthetic fabric, rubber, silicone, neoprene, nitrile rubber, PTFE, or other plastics. This flexible material allows the cover <NUM> to expand or contract, which thus increases or decreases the overall length of the cover <NUM>. In some embodiments, the cover <NUM> has a ribbed outer surface. The ribbed outer surface allows the hollow center <NUM> to maintain about a steady inner circumference while the cover <NUM> expands or contracts.

In some embodiments, the fuel system <NUM> can include two or more sets of bellows assemblies <NUM>, e.g., one for each boss <NUM>, <NUM>. In some embodiments, the fuel system <NUM> can include one of bellow assembly <NUM> for a single boss <NUM>, <NUM>. In some embodiments, the bellows assembly <NUM> is used in combination with a bearing block <NUM>, <NUM>, <NUM>.

<FIG> show another embodiment of a bearing block assembly <NUM> for use with the fuel system <NUM>. The bearing block assembly <NUM> can be similar to the bearing block assemblies described before. The bearing block assembly <NUM> can permit some movement between the first boss <NUM> and the bearing block assembly <NUM>, while also reducing the ingress of debris onto the first boss <NUM>. The bearing block assembly <NUM> can exclude ingress of debris from one or both of an outboard and an inboard side. The bearing block assembly can include an inner periphery <NUM>, which can be disposed around the first boss <NUM>. The inner periphery <NUM> provides a bearing support space for supporting the first bearing assembly <NUM>, which actually contacts the first boss <NUM>. As discussed above, the first bearing assembly <NUM> includes one or more dust wipers. In variations more or fewer wipers can be provided. In one embodiment the bearing block assembly <NUM> can be provided without any dust wipers in the interface between the boss <NUM> and the bearing surface of the assembly <NUM>, as shown in <FIG>. The bearing block assembly <NUM> can be supported in the enclosure <NUM>. For example, the bearing block assembly <NUM> can be coupled with the mounting brackets <NUM> directly or through the frame <NUM>.

As shown in <FIG> and <FIG>, the bearing block assembly <NUM> can include a bearing block <NUM>. <FIG> show that the bearing block <NUM> can include a first block portion 602A and a second block portion 602B. The block portions 602A, 602B can be separable in a manner similar to the rigid block member <NUM> of the fixed bearing block assembly <NUM> and the first bearing block <NUM> of first bearing block assembly <NUM>. The first block portion 602A can be lifted off of or separated from the second block portion 602B to provide access to an inner periphery <NUM> of the block portions 602A, 602B. The inner periphery <NUM> can be shaped and sized (e.g., diameter, length) in a variety of different ways. For instance, the inner periphery <NUM> can be circular, triangular, rectangular, pentagonal, hexagonal and octagonal. The inner periphery <NUM> can be shaped in many other configurations other than those previously listed. A bearing assembly <NUM> can be placed in the inner periphery <NUM> to provide support for the first boss <NUM>. The bearing assembly <NUM> can be secured in the inner periphery <NUM> in any suitable manner, such as by being received in a channel therein. In some embodiments, the bearing assembly <NUM> can be secured in place by a fastener, pin and key, latch, or other connector. In other embodiments, the bearing assembly can be secured in place through a more permanent method, such as through welding or bonding. In various embodiments, the shape and dimensions (e.g., diameter, length) of the bearing assembly <NUM> may be configured to secure to the inner periphery <NUM>. For example, where the intersection of the inner periphery <NUM> is a circle, the shape of the bearing assembly <NUM> may resemble a circle. Where the intersection of the inner periphery <NUM> is a rectangle, the shape of the outer periphery of the bearing assembly <NUM> may resemble a rectangle.

The bearing block <NUM> can include a ridge <NUM>. The ridge <NUM> can be formed on one or two sides of the first block portion 602A and the second block portion 602B. The ridge <NUM> can form a raised surface on a side of the bearing block <NUM>. The ridge <NUM> can be used to connect the bearing block <NUM> to a structure or can be used to secure a structure to the bearing block <NUM>. For example, a clamp <NUM> can be placed around the outer edge of the ridge <NUM> to hold a cover <NUM> in place. The ridge <NUM> can include an annular projection on a first or inboard side of the bearing block <NUM>. The ridge <NUM> can provide a peripheral, e.g., a circumferential, surface <NUM> providing an area upon which a clamp can apply a compression force. Although the peripheral surface <NUM> is illustrated as flat, a concave recess can be provided in the peripheral surface <NUM> to receive or partly receive a portion of a clamp.

The bearing block <NUM> can include one or more fastener holes <NUM>. The fastener holes <NUM> can be formed on one or more sides of the first block portion 602A and the second block portion 602B. The fastener holes <NUM> can be disposed on an outboard side, as shown. In some embodiments, fastener holes <NUM> can be disposed on inboard and outboard sides of the bearing block portions 602A, 602B. In some embodiments, the fastener holes <NUM> are through holes that extend through the block portions 602A, 602B. In other embodiments, the fastener holes <NUM> do not extend completely through the block portions 602A, 602B. The fastener holes <NUM> can be used to connect the bearing block <NUM> to a structure or can be used to secure a structure to the bearing block <NUM>. For example, the fastener holes <NUM> can receive fasteners <NUM> to secure the end cap <NUM> to the bearing block <NUM>. The fastener holes <NUM> can be used to secure the cover <NUM> in some embodiments.

The bearing block <NUM> can include through holes <NUM>. The through holes <NUM> can be formed on one side of the first block portion 602A and the second block portion 602B. The through holes <NUM> can be used connect the bearing block <NUM> to a structure. For example, the through holes <NUM> can be used connect the bearing block <NUM> to the mounting brackets <NUM> directly or the frame <NUM>.

The bearing block <NUM> provides convenience in assembling the fuel system <NUM> including the bearing block assembly <NUM>. For example, the separability of the first block portion 602A from the second block portion 602B enables the first bearing assembly <NUM> to be inserted into the inner periphery <NUM> in the space between the block portions 602A, 602B. When separated, the first and second block portions 602A, 602B can have a "C" shape profile. The "C" shape refers to the first and second block portions 602A, 602B having a first side facing away from the inner periphery 620A with a second side and a third side disposed opposite to each other and at opposite ends of the first side, similar to the block members <NUM> and <NUM> discussed above. This structure allows a ring member or other portion or all of the first bearing assembly <NUM> to be continuous which provides a more rigid structure. A continuous solid structure ring member can be more easily handled and may be more rugged with a longer service life.

<FIG> and <FIG> show further details of the endcap <NUM> and the integration thereof into the bearing block assembly <NUM>. The end cap <NUM> can have a cylindrical shape with an open-ended chamber. The end cap <NUM> can have an opening on one side of the end cap <NUM> that leads to the chamber. This open-ended chamber allows for the end cap <NUM> to be placed around objects. For example, the end cap <NUM> can be placed around the first boss <NUM>. This open-ended chamber can have a closed end at an inside surface <NUM> opposite to the opening to mitigate or exclude dust or debris from entering the space in the chamber. The end cap <NUM> can have one or more fastener holes, which allow for the end cap <NUM> to connect to a structure or can be used to secure a structure to the end cap <NUM>. For example, the end cap <NUM> can be fastened to a side of the bearing block <NUM>. The fastener holes can be disposed on a radially outwardly extending annular flange <NUM>. An inboard side of the flange <NUM> can make contact with outside surfaces of the block portions 602A, 602B.

As shown in <FIG> and <FIG>, the bearing block assembly <NUM> can include a cover <NUM>. The cover <NUM> can be a material that can be placed over other components. In some embodiments, the cover <NUM> can have a hollowed center, which allows for the cover <NUM> to be slid over other components. For example, the cover <NUM> can be slid or placed over the first boss <NUM>. The cover <NUM> can be made from a flexible material, such as natural or synthetic fabric, rubber, silicone, neoprene, nitrile rubber, PTFE, or other plastics. This flexible material allows the cover <NUM> to expand or contract, which thus increases or decreases the overall length of the cover <NUM>. The cover <NUM> can be connected to other components through a clamp <NUM>. For example, the cover <NUM> can be connected to the bearing block <NUM> and the first boss <NUM> of the fuel tank <NUM> with two clamps <NUM>. For example, a first clamp <NUM> can be disposed on the bearing block <NUM>, e.g., by compression onto the peripheral surface <NUM>, and a second clamp <NUM> can be disposed on a surface <NUM> of the first boss <NUM>. The first and second clamps <NUM> can have the same configuration, e.g., similar to hose clamps in one embodiment.

The bearing block assembly <NUM> can be used to prevent the ingress of dust and other debris into the inner periphery <NUM> and the first boss <NUM>. As shown in <FIG> and <FIG>, the bearing block <NUM>, end cap <NUM>, and cover <NUM> can be used to envelop most of, or all of, the outer surface <NUM> of the first boss <NUM>. For example, the cover <NUM> can be used for coverage of the first boss <NUM> between the connecting point <NUM> of the fuel tank and the connecting point to bearing block <NUM>, while the end cap can be used to for coverage of the first boss <NUM> between the bearing block <NUM> and the end of the first boss <NUM>. As a result of this coverage, the bearing block assembly <NUM> can greatly limit the amount of debris that can enter into the inner periphery <NUM>. This coverage can also keep the outer surface <NUM> of the first boss <NUM> free from debris. The use of wipers <NUM> in the interface between the bearing block <NUM> and the boss <NUM> can further exclude debris from this interface.

As noted above, the bearing block assembly <NUM> can permit some movement between the bearing block assembly <NUM> and the first boss <NUM>. The fuel tank <NUM> can be somewhat expanded, e.g., elongated, when under pressure in part due to the materials used to form the fuel tank <NUM>. As the fuel tank <NUM> expands or contracts, the first bearing assembly <NUM> disposed within the bearing block assembly <NUM> can allow for first boss <NUM> to move relative thereto. The cover <NUM> can expand, e.g., elongate, or contract, e.g., foreshorten, along with the fuel tank <NUM>, which allows for cover <NUM> to maintain its coverage over the first boss <NUM>. The cover <NUM> can include a bellows-type member, as discussed above in connection with <FIG> or can comprise a material or structure that permits elastic expansion and/or contraction. The chamber of the endcap <NUM> can be sized so as to allow for the fuel tank <NUM> to expand without the inside surface <NUM> of the endcap contacting the first boss <NUM>. For example, the inside surface <NUM> of the endcap <NUM> can be spaced away from the end of the first boss <NUM> or a plug <NUM> enclosing an access passage in the boss <NUM> at or beyond the expected travel distance of the first boss <NUM> or plug <NUM>. Thus, the bearing block assembly <NUM> can maintain its coverage of the first boss <NUM> while the fuel tank <NUM> expands or contracts without interfering with the expected expansion and contraction of the boss <NUM> and/or the plug <NUM>.

While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the disclosure. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms. Furthermore, various omissions, substitutions and changes in the systems and methods described herein may be made without departing from the scope of the invention defined only by reference to the appended claims.

Claim 1:
A neck mount support assembly, comprising:
a mounting block assembly configured to support an end of a fuel tank (<NUM>), the end of the fuel tank (<NUM>) having a boss (<NUM>), the mounting block assembly comprising:
a first portion (92A);
a second portion (92B) separable from the first portion (92A), the first portion (92A) and the second portion (92B) enclosing a bearing support space configured to receive the boss of the fuel tank;
a bearing assembly (<NUM>) disposed in the bearing support space, the bearing assembly (<NUM>) having:
an aperture at an inner portion (<NUM>) sized to receive an outer surface (<NUM>) of the boss of the fuel tank, the inner portion (<NUM>) including a support surface (<NUM>) configured for sliding support of the boss of the fuel tank at an interface, the support surface (<NUM>) defining a space (<NUM>) that is inward of the support surface (<NUM>);
an inboard wiper (<NUM>) positioned between the space (<NUM>) and a cylindrical portion of the fuel tank;
an outboard wiper (<NUM>) positioned such that the first portion (92A) and the second portion (92B) of the mounting block assembly are disposed between the outboard wiper (<NUM>) and the cylindrical portion of the fuel tank, the outboard wiper being disposed adjacent to the support surface (<NUM>);
a ring member (100A) that extends between a convex outer surface of the bearing assembly (<NUM>) and the support surface (<NUM>), the ring member (100A) having a first lateral surface and a second lateral surface, the first lateral surface and the second lateral surface each being disposed in a respective plane perpendicular to an axis (A) through the bearing assembly (<NUM>);
a first recess (<NUM>) formed in a first side surface of the ring member between the support surface (<NUM>) and the first lateral surface, the inboard wiper (<NUM>) being located in the first recess;
a second recess (<NUM>) formed in a second side surface of the ring member between the support surface (<NUM>) and the second lateral surface, the outboard wiper (<NUM>) being located in the second recess (<NUM>);
wherein the inboard wiper (<NUM>) and the outboard wiper (<NUM>) are each configured to limit debris from entering the interface between the support surface and the boss.