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Structural reinforcement system for automotive vehicles

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Publication number
US20070075569A1
US20070075569A1 US11561622 US56162206A US2007075569A1 US 20070075569 A1 US20070075569 A1 US 20070075569A1 US 11561622 US11561622 US 11561622 US 56162206 A US56162206 A US 56162206A US 2007075569 A1 US2007075569 A1 US 2007075569A1
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Patent type
Prior art keywords
member
material
structure
skeleton
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11561622
Inventor
William Barz
Thomas Coon
Michael Czaplicki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zephyros Inc
Original Assignee
L&L Products Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D29/00Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/001Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material
    • B62D29/002Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material a foamable synthetic material or metal being added in situ
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D25/00Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/04Door pillars ; windshield pillars

Abstract

An automotive vehicle frame reinforcement system has a skeleton member designed to be secured to a vehicle frame, such as a roof or pillar section. An expandable material, such as an epoxy-based reinforcing foam, is disposed on the skeleton member. Once the system is attached to the frame, the foam expands and cures during an automobile assembly operation, bonding the reinforcement system to the frame. As a result, the reinforcement system provides enhanced load distribution over the vehicle frame without adding excessive weight.

Description

    FIELD OF THE INVENTION
  • [0001]
    The present invention relates generally to a reinforced structural member for use in strengthening the stiffness and strength of a frame assembly. More particularly, the invention relates to a vehicle frame system of an automotive vehicle that is reinforced by a member coated over a portion of its surface with an expandable material, the combination of which increases the structural stiffness and strength of the automotive vehicle.
  • BACKGROUND OF THE INVENTION
  • [0002]
    For many years the transportation industry has been concerned with designing reinforced structural members that do not add significantly to the weight of a vehicle. U.S. Pat. Nos. 5,755,486; 4,901,500; and 4,751,249 described prior art reinforcing devices. While these prior art devices may be advantageous in some circumstances, there is needed a simple low cost structure that permits coupling the reinforcement member to a variety of structures of varying geometric configurations. In the automotive industry there is also a need for a relatively low cost system for reinforcing automotive vehicle frame structures.
  • SUMMARY OF THE INVENTION
  • [0003]
    The present invention is directed to a structural reinforcement system, and particularly one for reinforcing automotive vehicle frame structures, such as (without limitation) vehicle roof and pillar structures. The system generally employs a skeleton member adapted for stiffening the structure to be reinforced and helping to redirect applied loads. In use, the skeleton member is in contact, over at least a portion of its outer surface, with an energy absorbing medium, and particularly heat activated bonding material. In a particular preferred embodiment, the skeleton member is a molded metal, or composite frame and it is at least partially coated with foamable epoxy-based resin, such as L5206, L5207, L5208 or L5209 structural foam commercially available from L & L Products of Romeo, Mich.
  • [0004]
    In one embodiment the skeleton member along with a suitable amount of bonding or load transfer medium is placed in a cavity defined within an automotive vehicle, such as a vehicle roof structure, pillar structure or both. The bonding medium is activated to accomplish expansion of the resin in the space defined between the skeleton member and the wall structure defining the cavity. The resulting structure includes the wall structure joined to the skeleton member with the aid of the structural foam.
  • DETAILED DESCRIPTION OF THE DRAWINGS
  • [0005]
    The features and inventive aspects of the present invention will become more apparent upon reading the following detailed description, claims, and drawings, of which the following is a brief description:
  • [0006]
    FIG. 1 is a perspective view of aspects of an automotive vehicle roof and pillar structure, illustrating an A-Pillar and B-Pillar.
  • [0007]
    FIG. 2 is a perspective view of a skeleton member coated with an expandable resin in accordance with the present inventions.
  • [0008]
    FIG. 3 is another perspective view of the structure shown in FIG. 2.
  • [0009]
    FIG. 4 is a sectional view showing a coated skeleton member prior to activation of an expandable resin.
  • [0010]
    FIG. 5 illustrates the structure of FIG. 4 after the expandable resin has been expanded.
  • [0011]
    FIG. 6 is a perspective view of another illustrative structure in accordance with the present invention.
  • [0012]
    FIG. 7 is a side elevation view of the structure of FIG. 6.
  • [0013]
    FIG. 8 illustrates yet another structure in accordance with the present invention.
  • [0014]
    FIG. 9 illustrates the structure of FIG. 8 employed combination with a vehicle pillar structure.
  • DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
  • [0015]
    FIG. 1 illustrates an example of an automotive vehicle showing portions of a frame structure. As will be appreciated, it is common for such structures to include a plurality of hollow vehicle frame members that are joined to define the frame. One such structure, for purposes of illustration (without limitation) is a vehicle roof and pillar structure. As will be recognized, included in the roof and pillar structure may also be windows, sunroofs or other removable tops, vehicle doors and door components, headliners (with or without overhead accessories), or the like. As discussed later, other vehicle frame members are also contemplated within the scope of the present invention.
  • [0016]
    While FIG. 1 illustrates an A-Pillar 12 and B-Pillar 14, other pillars may likewise be employed in accordance with the present invention. In FIG. 1 there is shown also a portion of the roof structure 16 that bridges the A-Pillar 12 and B-Pillar 14.
  • [0017]
    Depending upon vehicle design, it is possible that the roof structure 16 bridging the A-Pillar and B-Pillar is relatively indistinguishable between the A-Pillar and B-Pillar such that the A-Pillar structure and B-Pillar structure effectively adjoin one another. In such instances the uppermost portion of the pillar structure is deemed the roof structure.
  • [0018]
    Reinforcement of the roof and pillar sections is accomplished by locating one or more skeleton members in accordance with the present invention in a hollow or cavity portion of the roof or pillar. FIG. 1 illustrates examples of this by showing a first member 16, a second member 18 and a third member 20 in such locations. The members 16, 18 and 20 preferably are sealingly secured to at least one of the roof and pillar sections by a bonding material, which upon heat activation produces adhesion to skeleton members to help secure the members and the walls defining the hollow from movement within the hollow portion.
  • [0019]
    Though other heat activated materials are possible, a preferred heat activated material is an expandable plastic, and preferably one that is foamable. A particularly preferred material is an epoxy-based structural foam. For example, without limitation, in one embodiment, the structural foam is an epoxy-based material, including an ethylene copolymer or terpolymer that may possess an alpha-olefin. As a copolymer or terpolymer, the polymer is composed of two or three different monomers, i.e., small molecules with high chemical reactivity that are capable of linking up with similar molecules.
  • [0020]
    A number of epoxy-based structural reinforcing foams are known in the art and may also be used to produce the structural foam. A typical structural foam includes a polymeric base material, such as an epoxy resin or ethylene-based polymer which, when compounded with appropriate ingredients (typically a blowing and curing agent), expands and cures in a reliable and predicable manner upon the application of heat or the occurrence of a particular ambient condition. From a chemical standpoint for a thermally-activated material, the structural foam is usually initially processed as a flowable thermoplastic material before curing. It will cross-link upon curing, which makes the material incapable of further flow.
  • [0021]
    An example of a preferred structural foam formulation is an epoxy-based material that is commercially available from L&L Products of Romeo, Mich., under the designations L5206, L5207, L5208 and L5209. One advantage of the preferred structural foam materials 14 over prior art materials is that the preferred materials can be processed in several ways. The preferred materials can be processed by injection molding, extrusion compression molding or with a mini-applicator. This enables the formation and creation of part designs that exceed the capability of most prior art materials. In one preferred embodiment, the structural foam (in its uncured state) generally is dry or relatively free of tack to the touch.
  • [0022]
    While the preferred materials for fabricating the structural foam have been disclosed, the structural foam can be formed of other materials provided that the material selected is heat-activated or otherwise activated by an ambient condition (e.g. moisture, pressure, time or the like) and cures in a predictable and reliable manner under appropriate conditions for the selected application. One such material is the epoxy based resin disclosed in U.S. patent application Ser. No. 09/268,810, the teachings of which are incorporated herein by reference, filed with the United States Patent and Trademark Office on Mar. 8, 1999 by the assignee of this application. Some other possible materials include, but are not limited to, polyolefin materials, copolymers and terpolymers with at least one monomer type an alpha-olefin, phenol/formaldehyde materials, phenoxy materials, and polyurethane materials with high glass transition temperatures. See also, U.S. Pat. Nos. 5,766,719; 5,755,486; 5,575,526; and 5,932,680, (incorporated by reference). In general, the desired characteristics of the structural foam include relatively high stiffness, high strength, high glass transition temperature (typically greater than 70 degrees Celsius), and good corrosion resistance properties. In this manner, the material does not generally interfere with the materials systems employed by automobile manufacturers.
  • [0023]
    In applications where a heat activated, thermally expanding material is employed, an important consideration involved with the selection and formulation of the material comprising the structural foam is the temperature at which a material reaction or expansion, and possibly curing, will take place. For instance, in most applications, it is undesirable for the material to be reactive at room temperature or otherwise at the ambient temperature in a production line environment. More typically, the structural foam becomes reactive at higher processing temperatures, such as those encountered in an automobile assembly plant, when the foam is processed along with the automobile components at elevated temperatures or at higher applied energy levels, e.g., during painting preparation steps. While temperatures encountered in an automobile assembly operation may be in the range of about 148.89° C. to 204.44° C. (about 300° F. to 400° F.), body and paint shop applications are commonly about 93.33° C. (about 200% or slightly higher. If needed, blowing agent activators can be incorporated into the composition to cause expansion at different temperatures outside the above ranges.
  • [0024]
    Generally, suitable expandable foams have a range of expansion ranging from approximately 0 to over 1000 percent. The level of expansion of the structural foam 14 may be increased to as high as 1500 percent or more. Typically, strength is obtained from products that possess low expansion.
  • [0025]
    Referring now to FIG. 2, there is shown one example of a first reinforcement member 16 in accordance with the present invention. This illustrated embodiment is useful, for instance, for reinforcing the juncture between an automotive vehicle roof 22 and the A-Pillar. The first member 16 has a first portion 24 adapted for placement in a cavity defined in a vehicle roof structure, and a second portion 26 adapted for placement in a cavity defined in a vehicle pillar, such as an A-Pillar as illustrated. Preferably the cross sectional silhouette of both the first portion 24 and the second portion 26 is generally complementary to the walls of the cavity defined in opposing roof or pillar structure. Though the member may also be solid, the member preferably includes a skeleton frame that is prepared to minimize weight while still achieving desired rigidity. Accordingly, the skeleton frame preferably is designed to employ a plurality of ribs that effectively are beamlike (e.g. I-beam) in function, thus helping to selectively strengthen the member. The ribs are illustrated in FIGS. 2 and 3 generally running orthogonal to one another. However, this is not intended as limiting, as the rib configuration may be varied depending upon the desired outcome.
  • [0026]
    In general, however, a rib is placed adjacent to, and in generally non-parallel relationship to a surface over which loads will be distributed. In FIG. 2, by way of illustration, a plurality of first ribs 28 are located adjacent to a surface of the member (shown covered with expandable material 30). FIG. 3 also shows how the ribs 28 (reference numerals illustrating some of the ribs, but not all) can be configured relative to one another to provide additional stabilization. In general, because of the relatively high bending moment of the ribs, without unduly increasing weight of the member, rigidity can be increased in locations where loads are anticipated by selective design and placement of the ribs. At the same time, enhanced load distribution is possible from the continuous surfaces and foam employed with the ribs to spread energy. Moreover, weight savings can be achieved by such design. For instance, the structure of the member is also such that over at least one quarter, preferably one half and more preferably greater than about three quarter of the length of the member at any given point between the ends of said member, the cross-sectional area of the member is less than 75%, more preferably less than 50% and still more preferably less than 20% of the overall area for a silhouette profile taken such point. In this manner, weight reductions of up to about 50%, more preferably about 70%, and still more preferably about 90%, are possible as compared with a solid structure of the same material.
  • [0027]
    It should be appreciated that other devices for securing the members 16, 18, and 20 to the vehicle frame may be employed, including suitable fasteners, straps, or other mechanical interlocks. Through-holes 32 may also be defined within the structure to assist in vehicle manufacturing. In a particularly preferred embodiment, the skeleton members of the present invention are injection molded plastics, such as nylons. However, other materials and manufacturing techniques may be employed similarly to achieve like results. For instance, high strength to weight metal components, such as aluminum, titanium, magnesium or the like, may be employed, as well as polymer composites such as a layered polymer with fibers capable of compression molding to generate strength.
  • [0028]
    Returning to FIG. 1, when employed in an automotive vehicle in accordance with the present invention, the skeleton members, particularly when coated with an expandable material (such as a heat activated epoxy based foam) can reinforce the region for which it is used by the combination of increased stiffening from the presence of beam-like ribs and load distribution through the combination of relatively high surface area continuous surfaces and an expandable material.
  • [0029]
    In another preferred embodiment, the expandable material, upon expansion will serve as a sealant for blocking the passage of fluids or other elements through the cavity. Thus, in such embodiment, it is preferred that the expandable material is provided continuously about generally the entirety of the periphery of any portion of the skeleton member that does not sealingly contact the automobile frame structure. FIG. 5 illustrates this by showing how skeleton member 16 coated with an expandable material 30 (shown in FIG. 4) is sealed in place upon activation of the material 30 (shown expanded in FIG. 5).
  • [0030]
    FIGS. 6 through 9 illustrate other embodiments in accordance with the present invention. In FIGS. 6 and 7, there is shown a reinforcement member 18 adapted for a pillar of an automotive vehicle. The structure of the skeleton member employs a plurality of ribs 34 adjoining one or more continuous surfaces 36 (shown coated with an expandable material 38).
  • [0031]
    The expandable material is shown in its expanded state. As the skilled artisan will appreciate, not all ribs are shown, and the specific design of each rib configuration will vary depending upon its intended use, and the geometry of the region being reinforced (e.g. walls 40 and 42 of the vehicle frame structure defining the cavity). Further expandable material may be employed in contact with the ribs.
  • [0032]
    FIGS. 8 and 9 illustrate yet another embodiment according to the present invention. In this embodiment, a skeleton member 20 having a plurality ribs 44 and generally continuous surfaces (shown coated with a layer 46) is fabricated to also include structure for facilitating vehicle manufacture. Specifically, the embodiment shown includes a plurality of through-holes 48, for enabling body shop weld access or the like. As shown in FIG. 9, in this embodiment, the expandable material layer 46, upon expansion, covers the circumference of a cross section of the structure.
  • [0033]
    The skilled artisan will appreciate that the use of the reinforcements disclosed herein is not intended as being limited only to illustrate the locations shown in FIG. 1. They can be used in any location within an automotive vehicle frame. For instance, other reinforced locations are also possible including but not limited to pillar to door regions, roof to pillar, mid-pillar, roof rails, windshield or other window frames, deck lids, hatches, removable top to roof locations, other vehicle beltline locations, motor rails, lower sills, cross members, lower rails, and the like. Moreover, vehicle roof tops may be reinforced to support additional loads in accordance with the present invention. In the same manner as was described above in the context of a roof and pillar system, a reinforcement frame member having an expandable material thereon is placed in a cavity defined in the vehicle frame structure. The material is expanded to help secure the reinforcement in place.
  • [0034]
    The preferred embodiment of the present invention has been disclosed. A person of ordinary skill in the art would realize however, that certain notifications would come within the teachings of this invention. Therefore, the following claims should be studied to determine the true scope and content of the invention.

Claims (23)

1-21. (canceled)
22. A method of forming a reinforcement member for reinforcing a structure of an automotive vehicle, the method comprising:
molding a plastic skeleton member with a plurality of ribs wherein at least two ribs of the plurality of ribs are spaced apart from and opposing each other or wherein at least two ribs of the plurality of ribs intersect each other;
adhering a foamable structural reinforcement material to the skeleton member to form a reinforcement member, wherein:
i. the foamable structural reinforcement material includes a blowing agent and a curing agent and is substantially tack free to the touch;
ii. the foamable structural reinforcement material is configured to activate to foam and cure upon exposure to an elevated temperature experienced in an automotive assembly operation; and
iii. the skeleton member is shaped to correspond to a cavity that is defined by a structure of an automotive vehicle, the structure being selected from a pillar, a roof rail, a frame member or a combination thereof.
23. A method as in claim 22 wherein the reinforcement member includes one or more mechanical fasteners for at least temporarily locating the reinforcement member within the cavity prior to activation of the reinforcement material.
24. A method as in claim 22 wherein the skeleton member includes an opening suitable for passage of a component therethrough.
25. A method as in claim 22 wherein the structure is an A-pillar.
26. A method as in claim 22 wherein the curing includes cross-linking of the reinforcement material and the reinforcement material includes a phenoxy material and wherein the plastic skeleton member is nylon.
27. A method as in claim 22 wherein the plurality of ribs are beam-like in function for strengthening the member.
28. A method as in claim 22 wherein the reinforcement material is configured to distribute loads over a surface of the skeleton member and at least one rib of the plurality of ribs is in non-parallel relationship to the surface over which the loads are to be distributed.
29. A method as in claim 22 wherein the member is such that, over at least one half of the member, the cross-sectional area of the member is less than 50% of the a silhouette profile of the member.
30. A method as in claim 22 wherein the skeleton member exhibits a weight reduction of 70% as compared to a solid structure of the same material.
31. A method as in claim 22 wherein the structure is a lower rail of the vehicle.
32. A method as in claim 22 wherein the skeleton member includes a first longitudinal outwardly facing surface opposite a second outward facing longitudinal surface and wherein both the first surface and the second surfaces support reinforcement material and the at least two of the plurality of ribs adjoin the first surface, the second surface or both.
33. A method as in claim 22 wherein the skeleton members includes the intersecting ribs, which include at least one laterally extending rib and at least one longitudinally extending rib.
34. A method as in claim 22 wherein the at least two ribs are substantially devoid of the reinforcement material.
35. A method as in claim 22 wherein the step of adhering the reinforcement material includes molding the reinforcement material upon the skeleton member.
36. A method as in claim 22 wherein the skeleton member and the structural material are configured to cooperatively seal the cavity to block passage of materials through the cavity.
37. A method of forming a reinforcement member for reinforcing a structure of an automotive vehicle, the method comprising:
injection molding a plastic skeleton member with a plurality of ribs wherein at least two ribs of the plurality of ribs are spaced apart from each other along a length of the skeleton member and opposing each other and wherein at least two ribs of the plurality of ribs intersect each other;
molding and adhering a foamable structural reinforcement material to the skeleton member to form a reinforcement member, wherein:
i. the foamable structural reinforcement material includes an epoxy resin, a blowing agent and a curing agent and is substantially tack free to the touch;
ii. the foamable structural reinforcement material is configured to activate to foam and cure upon exposure to an elevated temperature experienced in an automotive assembly operation; and
iii. the skeleton member is shaped to correspond to a cavity that is defined by a structure of an automotive vehicle, the structure being selected from a pillar, a roof rail, a frame member or a combination thereof.
38. The method of claim 37 wherein the skeleton member includes one or more extensions extending therefrom and wherein the skeleton member includes an opening suitable for passage of a component therethrough and wherein the structure is a lower rail of the vehicle.
39. A method as in claim 37 wherein the reinforcement member includes one or more mechanical fasteners for at least temporarily locating the reinforcement member within the cavity prior to activation of the reinforcement material and wherein the curing includes cross-linking of the reinforcement material and the reinforcement material includes a phenoxy material and wherein the plastic skeleton member is nylon and.
40. A method as in claim 37 wherein the plurality of ribs are beam-like in function for strengthening the member and wherein the reinforcement material is configured to distribute loads over a surface of the skeleton member and at least one rib of the plurality of ribs is in non-parallel relationship to the surface over which the loads are to be distributed
41. A method as in claim 37 wherein the member is such that, over at least one half of the member, the cross-sectional area of the member is less than 50% of the a silhouette profile of the member and wherein the skeleton member exhibits a weight reduction of 70% as compared to a solid structure of the same material.
42. A method as in claim 37 wherein the skeleton member includes a first longitudinal outwardly facing surface opposite a second outward facing longitudinal surface and wherein both the first surface and the second surfaces support reinforcement material and the at least two of the plurality of ribs adjoin the first surface, the second surface or both.
43. A method as in claim 37 wherein the skeleton members includes the intersecting ribs, which include at least one laterally extending rib and at least one longitudinally extending rib and wherein the at least one laterally extending rib and the at least one longitudinally extending rib of the first portion and are substantially devoid of the foam.
US11561622 2000-02-11 2006-11-20 Structural reinforcement system for automotive vehicles Abandoned US20070075569A1 (en)

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US09502686 US6467834B1 (en) 2000-02-11 2000-02-11 Structural reinforcement system for automotive vehicles
US09655965 US6619727B1 (en) 2000-02-11 2000-09-06 Structural reinforcement system for automotive vehicles
US10603674 US6921130B2 (en) 2000-02-11 2003-06-25 Structural reinforcement system for automotive vehicles
US10862645 US6938947B2 (en) 2000-02-11 2004-06-07 Structural reinforcement system for automotive vehicles
US11136058 US7160491B2 (en) 2000-02-11 2005-05-24 Structural reinforcement system for automotive vehicles
US11561622 US20070075569A1 (en) 2000-02-11 2006-11-20 Structural reinforcement system for automotive vehicles

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US11561622 US20070075569A1 (en) 2000-02-11 2006-11-20 Structural reinforcement system for automotive vehicles

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US10603674 Active 2020-03-06 US6921130B2 (en) 2000-02-11 2003-06-25 Structural reinforcement system for automotive vehicles
US10862645 Active US6938947B2 (en) 2000-02-11 2004-06-07 Structural reinforcement system for automotive vehicles
US11136058 Active US7160491B2 (en) 2000-02-11 2005-05-24 Structural reinforcement system for automotive vehicles
US11561622 Abandoned US20070075569A1 (en) 2000-02-11 2006-11-20 Structural reinforcement system for automotive vehicles

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US10862645 Active US6938947B2 (en) 2000-02-11 2004-06-07 Structural reinforcement system for automotive vehicles
US11136058 Active US7160491B2 (en) 2000-02-11 2005-05-24 Structural reinforcement system for automotive vehicles

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CA (1) CA2399457C (en)
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US20040217626A1 (en) 2004-11-04 application
US6921130B2 (en) 2005-07-26 grant

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