| 摘要 |
PURPOSE: An EGR valve using shape memory alloy is provided to accurately control the feedback quantity of EGR gas corresponding to operational conditions of an engine. CONSTITUTION: A valve housing(1) has an inside divided into a driving chamber(2) and a valve chamber(3), and has an inlet(4) and an outlet(5) on one side and a bottom surface of the valve chamber. A negative plate(6) and a positive plate(7) are formed at upper and lower parts of the driving chamber. A moving spring(8) is made of a shape memory alloy, wherein an upper end and a lower end of the moving spring are combined with the negative plate and the positive plate respectively. The moving spring contracts and expands according to the current quantity supplied through the negative plate and the positive plate. An insulating plate(9) is combined with a lower part of the negative plate. A valve member(20) has a valve body(22) for selectively opening and closing the outlet, and a combination part(23) to be combined with a bottom surface of the insulating plate so that the valve member opens and closes the outlet according to the contraction degree of the moving spring.
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