Exhaust Manifold Gasket

Abstract

An exhaust manifold gasket assembly having at least two layers and a series of tabs and recesses. The gasket has a first outer layer with an outer surface, an inner surface, two bolt hole flanges, a central aperture, and internal square cut-outs. The surfaces are bounded by an outer perimeter portion, with foldable tabs. A first inner layer and a second inner layer each with an outer surface, an inner surface, two bolt hole flanges, a central aperture, and pairs of internal slits. The surfaces are surfaces bounded by an outer perimeter portion, with locator tabs. Each inner layer has a bead circumferentially around the central aperture. A second outer layer may be provided having an outer surface, an inner surface, two bolt hole flanges, a central aperture, and internal square cut-outs. The surfaces are bounded by an outer perimeter portion, with recesses.

1 . An exhaust manifold gasket, comprising:
 a first outer layer comprising an outer surface, an inner surface, two bolt hole flanges with bolt holes therethrough, a central aperture between said flanges, and at least two internal square cut-outs, said surfaces bounded by an outer perimeter portion, wherein at least two foldable tabs extend from said outer perimeter portion;   a first inner layer and a second inner layer each comprising an outer surface, an inner surface, two bolt hole flanges with bolt holes therethrough, a central aperture between said flanges, and at least two pair of internal slits, said surfaces bounded by an outer perimeter portion, wherein at least two locator tabs extend from said outer perimeter portion of each of said first inner layer and said second inner layer, and a bead circumferentially extending about said central aperture inboard said outer perimeter portion of said first inner layer and said second inner layer; and   a second outer layer comprising an outer surface, an inner surface, two bolt hole flanges with bolt holes therethrough, a central aperture between said flanges, and at least two internal square cut-outs, said surfaces bounded by an outer perimeter portion, wherein at least two recesses extend inward from said outer perimeter portion outboard of each of said internal square cut-outs.   
     
     
         2 . An exhaust manifold gasket according to  claim 1 , wherein said foldable tabs on said first outer layer are aligned with said recesses on said second outer layer. 
     
     
         3 . An exhaust manifold gasket according to  claim 1 , wherein said pairs of internal slits on each of said first inner layer and said second inner layer are aligned with one another. 
     
     
         4 . An exhaust manifold gasket according to  claim 1 , wherein said locator tabs on each of said first inner layer and said second inner layer are opposite and diagonal from each other. 
     
     
         5 . An exhaust manifold gasket according to  claim 1 , wherein said internal square cut-outs on each of said first outer layer and said second outer layer are aligned with one another. 
     
     
         6 . An exhaust manifold gasket according to  claim 1 , wherein said central apertures of all said layer are aligned with one another and have a complimentary shape to one another. 
     
     
         7 . An exhaust manifold gasket according to  claim 1 , wherein said beads of said inner layers are radially aligned with one another. 
     
     
         8 . An exhaust manifold gasket according to  claim 1 , wherein said inner and outer surfaces on each of said outer layers are planar and parallel and define between them a substantially constant thickness. 
     
     
         9 . An exhaust manifold gasket according to  claim 1 , wherein four foldable tabs extend from said outer perimeter portion of said first outer layer. 
     
     
         10 . An exhaust manifold gasket according to  claim 1 , wherein two locator tabs extend from said outer perimeter portion of each of said first inner layer and said second inner layer. 
     
     
         11 . An exhaust manifold gasket according to  claim 1 , wherein said inner surface of said first inner layer is directly adjacent said inner surface of said first outer layer. 
     
     
         12 . An exhaust manifold gasket according to  claim 1 , wherein said outer surface of said second inner layer is directly adjacent said inner surface of said second outer layer. 
     
     
         13 . An exhaust manifold gasket according to  claim 1 , wherein said outer surface of said first inner layer is directly adjacent said inner surface of said second inner layer. 
     
     
         14 . An exhaust manifold gasket according to  claim 1 , wherein said foldable tabs on said first outer layer are folded into a C-shape and enclose around said outer perimeter portion of each of said first inner layer, said second inner layer and said second outer layer. 
     
     
         15 . An exhaust manifold gasket, comprising:
 a first layer comprising an outer surface, an inner surface, two bolt hole flanges with bolt holes therethrough, a central aperture between said flanges, and at least two internal square cut-outs, said surfaces bounded by an outer perimeter portion, wherein at least two foldable tabs extend from said outer perimeter portion; and   a second layer comprising an outer surface, an inner surface, two bolt hole flanges with bolt holes therethrough, a central aperture between said flanges, and at least two pair of internal slits, said surfaces bounded by an outer perimeter portion, wherein two locator tabs extend from said outer perimeter portion, and a bead circumferentially extending about said central aperture inboard said outer perimeter portion.   
     
     
         16 . An exhaust manifold gasket according to  claim 15 , wherein said internal square cut-outs on said first layer are aligned with said pairs of internal slits on said second layer. 
     
     
         17 . An exhaust manifold gasket according to  claim 15 , wherein said locator tabs on said second layer are opposite and diagonal from each other. 
     
     
         18 . An exhaust manifold gasket according to  claim 15 , wherein said central apertures of said both layers are aligned with one another and have a complimentary shape to one another. 
     
     
         19 . An exhaust manifold gasket according to  claim 15 , wherein four foldable tabs extend from said outer perimeter portion of said first layer. 
     
     
         20 . An exhaust manifold gasket according to  claim 15 , wherein said foldable tabs on said first outer layer are folded into a C-shape and enclose around said outer perimeter portion of said second layer.