The present disclosure relates generally to a clip and fastener assembly used for securing a component to another component or structure, and more particularly relates to an assembly including a nut captured by a C-shaped clip that is attachable to a mounting bracket of a component to provide a simple and effective way of attaching that component to another component or structure, such as a vehicle or machine.
Fastener assemblies are frequently used to help secure a component, such as an air cleaner housing, to another component or structure, such as a vehicle or machine. When such an air cleaner housing is used for air filtration, the housing typically includes an opening into which a removable and replaceable air filter is held. The air cleaner housing can be made of plastic or another relatively lightweight material and can include mounting brackets along one or more of its outer surfaces. Rather than attaching the housing directly to another component, a fastener assembly can be affixed to each of the mounting brackets that are being utilized for a particular application, and a fastener (e.g., a bolt) of each fastener assembly can be used to secure the housing to the other component.
There is a desire to provide a fastener assembly that is easily attachable to a mounting bracket or feature of a housing, wherein such an attachment is preferably accomplished without the use of tools or tools unique to a specific assembly operation. For convenience and ease of assembly, it is further desired that such a fastener assembly includes a captive fastener, such as a nut. It is further desired that the fastener assembly minimizes plastic relaxation by distributing the clamp loads of the completed fastener assembly more uniformly across the mounting brackets or features.
The present invention relates generally to clip and nut assemblies that are connected to a component and used to help distribute the loads that occur at bolted mounting connections and assist in secure attachment of that component to another component or structure. The clip and nut assemblies are provided with a “snap-fit” configuration that allows their attachment to mounting structures of a component (e.g., a plastic air cleaner housing having integrally molded mounting brackets or features) by simply pressing them onto a cooperating structure.
In accordance with embodiments described herein, a clip and nut assembly is provided that includes a generally C-shaped clip component having a lower plate with an upper surface, a retention tab extending from and curved over the lower plate so that a lower surface of the retention tab is facing and spaced from the upper surface of the lower plate, and a first aperture extending through the lower plate. The clip and nut assembly further includes a nut component including a first nut portion sized to fit within the first aperture and a second nut portion extending from the first nut portion.
The first aperture extending through the lower plate may include a hexagonal opening, and the first portion of the nut component may have an outer hexagonal shape. The retention tab may include a second aperture extending through it, which may be vertically aligned with the first aperture extending through the lower plate, The retention tab may also include a distal end portion that is bent at least slightly upwardly from a proximal portion. In embodiments, the generally C-shaped clip component may be made of spring steel. The nut component may include a central threaded opening, and/or the second nut portion may include a head. portion extending from the first nut portion.
In accordance with embodiments provided herein, a component assembly is provided that includes at least one mounting feature having a bottom wall, a first side wall extending from the bottom wall, a second side wall extending from the bottom wall and spaced from the first side wall, a mounting aperture extending through the bottom wall, and first and second generally horizontal channels extending along the first and second side walls, respectively. The component assembly further includes a clip and nut assembly corresponding to at least one of the mounting features, wherein the clip and nut assembly includes a generally C-shaped clip component with a lower plate having an upper surface, a retention tab curved over the lower plate so that a lower surface of the retention tab is facing and spaced from the upper surface of the lower plate, and a first aperture extending through the lower plate. The clip and nut assembly also includes a nut component having a first nut portion sized to fit within the first aperture and a second nut portion extending from the first portion. With this embodiment, the lower plate is positioned within the first and second horizontal channels of the at least one mounting bracket with the first aperture of the lower plate aligned with the mounting aperture of the at least one mounting feature.
In accordance with embodiments provided herein, a method of attaching an air cleaner housing to a structure is provided, wherein the air cleaner housing comprises at least one mounting feature. The method first includes a step of positioning a clip and nut assembly adjacent to the at least one mounting feature, wherein the clip and nut assembly includes a generally C-shaped clip component having a lower plate comprising an upper surface, a retention tab curved over the lower plate so that a lower surface of the retention tab is facing and spaced from the upper surface of the lower plate, and a first aperture extending through the lower plate. The clip and nut assembly further includes a nut component having a first nut portion positioned within the first aperture extending through the lower plate, a second nut portion extending from the first portion, and a central threaded opening extending through the first and second nut portions. The method further includes the steps of sliding the lower plate of the C-shaped clip component into first and second horizontal channels extending along first and second side walls of the at least one mounting feature, respectively, until the first aperture of the lower plate is aligned with a mounting aperture extending through a bottom wall of the at least one mounting bracket, positioning the mounting aperture of the at least one mounting bracket adjacent to an aperture extending through the structure, extending a fastener through the mounting aperture and the aperture extending through the structure, and threading the fastener into the central threaded opening of the nut component.
In accordance with embodiments provided herein a clip and nut fastener assembly is provided that includes first and second contact surfaces corresponding to first and second clamp load paths, respectively, wherein the first and second contact surfaces are spaced from each other relative to a fastening axis of the fastener assembly. The clip and nut fastener assembly includes a clip component with a lower plate comprising the first contact surface positionable adjacent to a top surface of a mounting feature of a component and a first aperture extending through the lower plate. The clip and nut fastener assembly further includes a nut component having a first nut portion sized to fit within the first aperture of the lower plate, wherein a bottom surface of the first nut portion comprises the second contact surface, and a head portion extending from the first nut portion. A fastener extends along the fastening axis through a structure to which the component is being attached, the mounting feature of a component being attached to the structure, the nut component, and the first aperture of the clip component, wherein the fastener comprises a fastener head. The first clamp load path extends along the fastening axis from the head portion of the nut component through the lower plate of the clip component, through the mounting feature of the component, through the structure to which the component is being attached, and to the fastener head, and the second clamp load path extends along the fastening axis from the first nut portion through the structure and to the fastener head.
The present invention will be further explained with reference to the appended Figures, wherein like structure is referred to by like numerals throughout the several views, and wherein;
Referring now to the Figures, wherein the components are labeled with like numerals throughout the several Figures, and initially to
Referring also to
The nut component 32 further includes a central threaded opening 44. The nut component 32 may be a commercially available flange nut so that it is readily available in in multiple materials, strength grades, and finishes, as desired, or the nut component 32 can be particularly designed for specific applications. The threads of the central threaded opening 44 can be selected to accommodate a particular fastener, such as a bolt.
The clip component 30 generally includes a plate portion 34 from which a retention tab portion 36 extends. The plate portion 34 is shown as a generally rectangular planar member through which a hexagonal opening 38 extends, When assembled, the hex-shaped first portion 40 of the nut component 32 will fit into the hexagonal opening 38 with at least a portion of the head portion 42 extending above an upper surface 46 of the plate portion 34, as illustrated in
As is best illustrated in
The retention tab portion 36 is provided with a distal end portion 52 that is optionally bent at least slightly upwardly from a proximal portion, wherein the distal end portion 52 can be used as a “lead-in” feature that allows the nut component 32 to be readily assembled within the clip component 30, as will be described below. The retention tab portion 36 can be used to hold the nut component 32 captive as a subassembly (as is shown with the clip and nut assembly 10 of
The retention tab portion 36 further optionally includes an aperture 68 that is positioned so that it will be directly above the hexagonal opening 38 in the plate portion 34 when the clip component is configured as the C-shaped member illustrated in the figures. The aperture 68 can be sized so that a bolt or other connector extending through the nut component 32 can pass through the aperture 68 without interference.
The mounting bracket 12 illustrated herein is intended to be one exemplary configuration of such a bracket or feature, wherein it is understood that a wide variety of different configurations for such a bracket are possible. For example, the top walls of such mounting brackets are optional. Further, the side walls can be shorter or taller than illustrated, and do not necessarily have the same height as each other. That is, the height, width, depth, and other features of the mounting brackets can be similar or different than illustrated, and are designed to provide mounting locations for the component with which they are associated.
The bottom wall 56 of mounting bracket 12 includes an opening 66, which can be hexagonal-shaped, for example, that is positioned and oriented for engagement with the hex-shaped first portion 40 of nut component 32. That is, each of the six edges of the optionally hexagonal-shaped opening 66 of the bottom wall 56 arc oriented to align with the six edges of the nut component 32 that is extending through the hexagonal opening 38 of the plate portion 34. As previously described, the hexagonal shape of the first portion of the nut component and the opening through the bottom wall of the plate portion is one exemplary shape, however, it is understood that the first portion of the nut component and the opening through the bottom wall of the plate portion can have different cooperating shapes.
An exemplary series of steps for connecting a preassembled clip and nut assembly 10 to a mounting bracket 12 is illustrated in
The clip and nut assembly 10 will be further pushed into the channels 64 of the mounting bracket 12, as shown in
As described above, the spring feature of the retention tab portion 36 of the clip component 30 serves a dual purpose. First, the retention tab portion 36 undergoes a slight deflection and returns to its original shape when the nut component 32 is pushed into the clip component 30. Second, the retention tab portion 36 deflects and then returns to its original shape when the clip and nut assembly is pushed into a mounting bracket, such as the mounting bracket of an air cleaner housing.
After the desired number of clip and nut assemblies 10 have been attached to their respective mounting brackets 12, the associated component (e.g., air cleaner housing), can be positioned in its desired location on a component or structure (e.g., a machine) to which the component will be attached. At this point, the plate portion 34 will function as a wrench during assembly of a component to the machine to restrain the nut component 32 from turning. The plate portion 34 (which is generally rectangular, in this embodiment) provides a mechanical advantage to transfer local high assembly torque stresses at the surface of the nut component 32 to the area of the plate portion 34 that surrounds the opening 38. This mechanical advantage reduces the stresses from the assembly torque to a level that can be restrained by the body of the component and/or its mounting brackets 12 as constrained by the mating rectangular shape formed by the side walls.
With the configurations described herein, forces are distributed from the head portion 42 of the nut component 32 to the mounting bracket 12 of the corresponding component. Time spring steel characteristics of the clip component 30 can provide a hardness property that is equivalent to the hardness of a washer component at the targeted property class of the nut component. The nut can be a Class 10, for example, but other classes can instead be used. The hardness of the clip component can be Rockwell C38 minimum, for example, although other hardness ranges can instead be used. When the component, such as an air cleaner assembly, is assembled to the machine, the clamping forces of the nut component 32 are distributed from the head portion 42 of the nut component 32 through the plate portion 34 of the clip component 30 and directed onto the surface of the mounting bracket 12. This is accomplished with material properties in the appropriate class for the desired fastener class (e.g., Class 10).
The plate portion 34 further functions as a washer to distribute clamp loads from the head portion 42 of the nut component 32 to a larger surface area of the mounting brackets 12 of the component 20. The redistribution of clamp loads enables a higher amount of stresses to be applied to a lower strength material of a mounting bracket 12, such as a plastic mounting bracket in the case of a plastic component (e.g., an air cleaner housing).
When the clip and nut assemblies described herein are assembled and attached to mounting brackets, the clamping force is divided and applied in two locations. First, bolting grip (or clamp) forces are applied from head portion 42 of the nut component 32 to the plate portion 34 of the clip component 30, which continues to the bottom wall 56 of a mounting bracket 12 to provide the restraint needed to secure the component (e.g. air cleaner housing) to a structure or machine 122. Second, a grip (or clamp) path occurs where the bottom of nut component 32 contacts the top of the structure or machine 122. A first grip path is generally softer or more flexible than a second grip path, wherein the first grip path is defined by the summation of: (1) the flex characteristics of the spring steel clip (comparatively characterized by 55,000 psi tensile strength), and (2) the relative compressible nature of a bottom wall 56 (comparatively characterized by 20,000 psi tensile strength when fabricated from plastic, for example). The second grip path is defined by the hardness of the nut 32 (comparatively characterized by 150,000 psi tensile strength for a Class 10 fastener), and the structure or machine 122 (comparatively characterized by 60,000 psi tensile strength, when made of steel). The more rigid characteristic of this second grip path is desirable to accommodate the full rated torque applied in the bolted connection.
This staged (or sequential) clamping characteristic is accomplished through an exemplary dimensional relationship of the parts. For one example, the parts are sized such that there is a small gap (e.g., approximately 0.2 mm) in the second grip path between the nut and the machine 122 when the first grip path first makes contact. This enables the components of the first grip path to experience the following: (1) a slight compression of the plastic bottom wall 56, and (2) a slight local deflection of the plate portion 34 of the clip component 30 where it meets the angled flange of the nut component 32. This characteristic provides accommodation for the size tolerances in all of the mating components as this gap could range from approximately 0.0 mm to 0.4 mm for the size of this exemplary assembly. As the bolt continues to be tightened, the nut contacts the plate in the second grip path and the relative movement of the components is halted. As a final stage, the bolt can continue to be tightened to the full rated torque. In the relationship created between the torque and strength properties, the bolt can often experience a stretch when tightened to the full rated torque. This stretch experienced by the bolt is desirable as it provides the forces to maintain friction within the mating threads of the nut and bolt, which in turn prevent the bolt from loosening.
As compared to a U-nut on a component 20 such as an air cleaner, the nut component 32 of the clip and nut assemblies described herein will be flush with the mounting face of the component 20. This positions the nut component 32 directly in contact with the mounting surface of the machine, enabling the bolted connection to be completed with only rigid components (e.g., metal components, such as steel) in the grip, described previously as the second grip path.
The clip and nut assemblies 10 described herein can be fitted with a flange nut that has a metallurgy suited to withstand the assembly torque required for the application. As an example, a common torque requirement for a ISO Property Class 10, M8 fastener is 36.5 Newton-meters. This requirement can be met with the clip and nut assemblies 10. In contrast, a typical torque limitation for a U-Nut is 18 Newton-meters.
The present invention has now been described with reference to several embodiments thereof. The entire disclosure of any patent or patent application identified herein is hereby incorporated by reference. The foregoing detailed description and examples have been given for clarity of understanding only. No unnecessary limitations are to be understood therefrom. It will be apparent to those skilled in the art that many changes can be made in the embodiments described without departing from the scope of the invention. Thus, the scope of the present invention should not be limited to the structures described herein, but only by the structures described by the language of the claims and the equivalents of those structures.
This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63/107,694, filed Oct. 30, 2020, the entire contents of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/US2021/056813 | 10/27/2021 | WO |
Number | Date | Country | |
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63107694 | Oct 2020 | US |