F - Mech Eng,Light,Heat,Weapons – 01 – L
Patent
F - Mech Eng,Light,Heat,Weapons
01
L
F01L 3/02 (2006.01) C04B 35/83 (2006.01)
Patent
CA 2248230
A carbon fiber reinforced carbon composite valve for internal combustion engines and the like formed of continuous carbon fibers (16) throughout the valve's stem (11) and head (13). The valve includes braided carbon fiber material (16) over axially aligned unidirectional carbon fibers (15) forming a valve stem (11). The braided and unidirectional carbon fibers are broomed out at one end (18) of the valve stem forming the shape of the valve head. The valve-shaped structure is densified and rigidized with a matrix of carbon containing discontinuous carbon fibers and the finished valve is treated to resist oxidation. Also disclosed is a carbon matrix plug containing continuous and discontinuous carbon fibers and forming a net-shape valve head acting as a mandrel over which the unidirectional and braided carbon fibers are formed according to textile processes. Also disclosed are various preform valves and processes for making finished and preform carbon fiber reinforced carbon composite valves.
L'invention porte sur une soupape de moteur à combustion interne et autres faite d'un composite de carbone renforcé de fibres de carbone continues (16) s'étendant sur toute la longueur de la tige (11) et de la tête (13). La soupape comporte un matériau de fibres de carbone tressées (16) recouvrant les fibres de carbone unidirectionnelles (15) orientées axialement formant la tige (11) de soupape. Les fibres tressées et unidirectionnelles s'évasent à une extrémité (18) de la tige de soupape de manière à constituer la forme de la tête de soupape. La structure en forme de soupape est rendue plus dense et plus rigide par une matrice de carbone contenant des fibres de carbone discontinues. La soupape une fois terminée est soumise à un traitement antioxydation. L'invention porte également sur un tampon fait d'une matrice de carbone contenant des fibres de carbone continues et discontinues et constituant une tête de soupape en forme de filet jouant le rôle d'un mandrin sur lequel les fibres de carbone unidirectionnelles et tressées sont disposées selon des techniques propres aux textiles. L'invention porte enfin sur différentes préformes de soupapes et sur un procédé de fabrication de soupapes de composites de carbone renforcé de fibres, finies et en préformes.
Northam George Burton
Ransone Philip Owen
Rivers Horace Kevin
Gowling Lafleur Henderson Llp
The United States Of America As Represented By The Administrator
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