Multi-layered composite gasket

Abstract

A multi-layered composite gasket (10) includes three, preferably metallic cores ( 12, 14). A solid center core ( 12) is flanked on both sides by bonded paper layers (30). Perforated cores (14) mechanically interlock with each paper layer (30) through inwardly directed tangs (22). Graphite layers (26) are disposed outside of each perforated core (14) and are mechanically interlocked thereto by outwardly directed tangs (20) extending from the perforated cores (14). When using the gasket (10) material for sealing cylinder heads in internal combustion engines, a fire ring (46) may be affixed witha fire ring holder (48). The gasket (10) can be manufactured by making first and second preform sheets (32) comprised of one perforated core (14) sided with one paper layer (30) and one graphite layer (26).; The preform sheets (32) are then bonded to a center core (12) using a heat activated adhesive. Combining rollers (42) compress and densify the layers to form the completed material set which can be stored on a coil (44) or cut into sheets.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 152,456, filed February 13, 2009, which is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to a multi-layer composite gasket and a method for manufacturing the gasket. Background technique [0004] Gaskets are used in many applications to perfect a fluid seal between two mating components. The gasket is usually clamped between mating elements and compressed there. In an internal combustion engine, many gaskets serve various functions. As an example, cylinder head gaskets sit between the engine's cylinder block and cylinder head to prevent combustion gases from escaping from the combustion chamber when the engine is in use. However, the cylinder head gasket in this application not only seals the combustion chamber, but also the various coolant and lubricating oil flow passages that extend between...

AI Technical Summary

Problems solved by technology

If the adhesive layer does not break under the shear load, the shear load is almost entirely carried by the graphite layer, and placing these layers under excessive shear stress will, over time, impair their retention of mating components. good sealing ability

Therefore, prior art liner structures like the ones depicted in Figures 2 and 3 risk reduced service life due to failure modes due to excessive shear stresses

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