F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
F16J 15/06 (2006.01) F02F 11/00 (2006.01)
Patent
CA 2208743
An improved expandable gasket, sealed joint and method of forming a sealed joint which includes a gasket (20) having at least 5 % by weight expanded or unexfoliated graphite. The graphite material (22) is preferably a mixture of expanded and unexpanded graphite compressed in a sheet or other shape affixed to a metal plate (24). The preferred composition is 5 to 70 % by weight of unexpanded graphite and 30 to 95 % expanded graphite, wherein the percentage of unexpanded graphite is controlled to provide the desired gasket expansion. A more preferred composition includes at least 10 % by weight unexfoliated graphite or more preferably 15 to 50 % by weight. The gasket is placed between the surfaces to be sealed and clamped in place. When the joint is heated, the unexpanded graphite exfoliates, causing the gasket to swell or expand, tightly sealing the joint. The expandable gasket of this invention is particularly suitable for automotive application, including head and exhaust gaskets which are subject to temperatures exceeding about 400 ~C.
Joint d'étanchéité dilatable amélioré et procédé de constitution d'une barrière étanche utilisant un joint (20) comportant au moins 5 % en poids de graphite expansé ou non exfolié. Le matériau graphite (22) est de préférence un mélange de graphite expansé et non expansé comprimé sous forme de feuille ou d'autres formes et fixé à une plaque métallique (24). La composition préférée comporte 5 à 70 % en poids de graphite non expansé, et 30 à 95 % de graphite expansé, le pourcentage du premier étant ajusté en fonction de la dilatation voulue. Une composition idéale comporte au moins 10 % en poids de graphite non expansé, et mieux encore, de 15 à 50 % en poids. Le joint est placé entre les surfaces à rendre étanches, puis bloqué. Lorsque le joint est chauffé, le graphite non expansé s'exfolie, ce qui provoque l'enflure ou la dilatation du joint et l'étanchéité de la barrière. Ledit joint dilatable est particulièrement adapté à l'industrie automobile notamment pour former des joints de culasse et d'échappement soumis à des températures dépassant environ 400 ~C.
Freudenberg-Nok General Partnership
Gowling Lafleur Henderson Llp
Indian Head Industries Inc.
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