High pressure fuel passage sealing for internal combustion...

F - Mech Eng,Light,Heat,Weapons – 02 – M

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Details

F02M 61/16 (2006.01) F02M 57/02 (2006.01) F02M 59/44 (2006.01)

Patent

CA 2199197

A fuel injector assembly for an internal combustion engine includes an injector body having a control valve in fluid communication with a source of fuel. A fuel nozzle assembly is employed to disperse fuel from the assembly. A high pressure fuel passage provides fluid communication between the control valve and the fuel nozzle assembly. The high pressure fuel passage has at least one end opening through the injector body and having an inner diameter. A shape memory alloy plug seals the open end of the fuel passage. The plug has a first diameter smaller than the inner diameter when inserted into the open end and a second diameter in sealing engagement with the inner diameter upon undergoing a metallurgical phase change from martinsite to austenite such that the plug generates a seal with the fuel passage. In addition, a method of making the fuel injector assembly employing a shape memory alloy plug to seal the high pressure fuel passage is also disclosed.

Un ensemble d'injection de carburant pour moteur à combustion interne comprend un corps d'injecteur muni d'un robinet de commande relié à une alimentation en carburant. Une buse d'injection sert à disperser le carburant amené par l'injecteur. Une communication haute pression assure le passage du fluide entre le robinet de commande et l'injecteur. Au moins une des extrémités de la communication haute pression débouche dans le corps de l'injecteur et comporte un diamètre intérieur. Un bouchon en alliage à mémoire de forme ferme l'extrémité ouverte de la communication carburant. Le bouchon comporte un premier diamètre, inférieur au diamètre intérieur de l'extrémité ouverte de la communication carburant, et un deuxième diamètre qui permet, à la faveur d'un changement de phase métallurgique du martensite à l'austénite, un ajustement parfait du bouchon dans le même diamètre intérieur, de manière que le bouchon obture hermétiquement la communication carburant. Une méthode de construction de l'ensemble d'injection de carburant utilisant un bouchon en alliage à mémoire de forme pour garantir l'étanchéité de la communication haute pression est également divulguée.

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