Patent ID: 6354271
Filing Date: 2002-03-12
Classification: F02M

Abstract:
A hydraulically actuated fuel injector comprising:an injector body defining an actuation fluid cavity fluidly connected to a piston bore via a plurality of actuation fluid passages; an intensifier piston having a side surface and a top that includes a first hydraulic surface separated from a second hydraulic surface, and being positioned in said piston bore and moveable a stroke distance between a retracted position and an advanced position; a first passage of said plurality of actuation fluid passages having a relatively unrestricted flow area; a second passage of said plurality of actuation fluid passages having a relatively restricted flow area; a third passage of said plurality of actuation fluid passages having a relatively unrestricted flow area and being blocked by said side surface over a portion of said stroke distance; said first hydraulic surface being exposed to fluid pressure in a first cavity fluidly connected to said first passage over a beginning portion of said stroke distance; and said second hydraulic surface being exposed to fluid pressure in a second cavity fluidly connected to said second passage over said beginning portion of said stroke distance.