Importance

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Abstract

An assembly for a fuel injector that includes a piston that is decoupled from the needle of a needle valve. The piston is slidingly positioned in a disk bore. The portion of needle in the disk bore is smaller than the disk bore so as to prevent the disk bore from interfering with movement of the needle between seated and unseated positions. During periods of operation, the upper surface of the piston is engaged by a control volume of fuel that pushes the needle toward a seated position, while the needle pushes in an opposing direction against a lower surface of the piston. The surface area of the piston acted on by the control volume is larger than the upper portion of the needle that is typically acted upon by the control volume, thereby providing a larger force on the piston that keeps the needle in a seated.

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First Claim