Stock material or miscellaneous articles – All metal or with adjacent metals – Honeycomb – or with grain orientation or elongated elements...
Patent
1997-09-23
2000-07-18
Jones, Deborah
Stock material or miscellaneous articles
All metal or with adjacent metals
Honeycomb, or with grain orientation or elongated elements...
428603, 428604, 72196, F16L 5908
Patent
active
06090495&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a flat structure made of sheet metal, foil or layers of foil for use as heat shields such as those used for between the muffler of a motor vehicle and other adjacent parts.
2. Description of Prior Art
German patent 9,103,864 discloses a heat shield of the general type which is the subject of the present invention. It describes a mat consisting of several layers of shaped foil, where these foil layers are arranged in parallel and at a spacing relative to each other. The layers are attached to a sheet metal part with appropriate fastening devices in such a way as to form a heat shield. With this known mat, each layer of the foil is deformed to prevent direct surface contact with each adjacent layer. The degree of thermal insulation of such a mat is greatly impaired, however, because due to the deformation of all mats, incident radiant heat is reflected repeatedly on the deformations, and the foil layers heat up due to transverse reflections, so that the resulting degree of thermal insulation is relatively unfavorable. Furthermore, it is regarded as a disadvantage that several mat layers must be used to achieve such an insulation effect.
SUMMARY OF THE INVENTION
A primary purpose of the present invention is to achieve a desired degree of thermal insulation with at least a single mat layer. Accordingly, an object of this invention is to improve on flat structures of the prior art so that a highly effective heat shield can be created at a much lower cost.
An important feature of the present invention is that it has a flat structure which consists of a foil or a sheet metal, where the foil is about 0.4 mm thick and the sheet metal which may also be used is about 0.4 mm thick.
The inventive concept of the present invention also includes several parallel shaped flat structures stacked one atop the other or a combination of foil structures with sheet metal structures. This invention incorporates and improves upon the layer arrangements of the prior art.
For reasons of simplicity, the following detailed description describes only the shaping of a single flat structure, which may be designed as either a foil or as sheet metal, although there may also be several parallel flat structures, as stated above.
According to this invention, the flat structure is given a three-dimensional structure, thus forming shaped areas that form shaped surfaces of straight radiant surfaces projecting out of the plane of the unshaped flat structure, and these radiant surfaces are in turn as unshaped as possible and have favorable reflection properties. An important part of the present invention is thus that at least one shaped flat structure is used to produce such a heat shield, and shaped surfaces that project out of the plane of the unshaped surface are created in this flat structure, where the projecting surfaces are to be designed as reflective or mirror surfaces. These surfaces should have optimum reflection properties and should reflect incident radiant heat back in the same direction if possible.
The intermediate shaped surfaces serve only to permit three-dimensional shaping of this flat structure without the straight unshaped surfaces being bent and deformed themselves. Thus the mirror properties of the areas that project out of the surface should be maintained and retained as much as possible, while the other areas are shaped in an intentional and controlled manner to permit three-dimensional shaping of this flat structure for the purpose of producing a heat shield. Thus, by applying shaped surfaces, predetermined bending lines and predetermined bending surfaces are created, premitting controlled bending of this flat structure only in this area, while the outside areas must be unshaped and should have optimum reflection properties.
It is important here for the three-dimensional bending of this flat structure in the direction of the heat source to be designed so that the grooves formed in the vicinity of the shaped surfaces will close when shaping th
REFERENCES:
patent: 4085816 (1978-04-01), Amagai et al.
patent: 4328696 (1982-05-01), Gonwa et al.
patent: 5167060 (1992-12-01), Nawrocki et al.
patent: 5981082 (1999-11-01), Pirchl
Hecralmat
Jones Deborah
Savage Jason
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