Injection rate shaping control ported check stop for a fuel injection nozzle

A nozzle and tip assembly adapted for a fuel injector comprising:

• a check housing having a central axis and defining an internal cavity therealong, and defining at least one spray orifice through the housing at a first end portion of the cavity, and defining a control port seat and a control port of a smaller diameter than the cavity at a second end portion of the cavity, and defining a discharge passage adapted to fluidly connect the cavity to a first end portion of a fuel pump chamber;
• a check disposed within the cavity and sized to provide a close fitting sliding and radially sealing relationship with the cavity and having a portion directed toward the at least one orifice and blocking the at least one orifice in a first position;
• a rate shaping valve having first and second end portions, said rate shaping valve disposed within the cavity and movable between a first position wherein the first end portion of the rate shaping valve abuts against the second end portion of the cavity thereby blocking fluid flow through the control port and a second position wherein the first end portion of the rate shaping valve is spaced from the second end portion of the cavity thereby permitting fluid flow through the control port;
• means for biasing the first end portion of the rate shaping valve and the check to their respective first positions wherein said biasing means is functionally disposed between the check and the rate shaping valve;
• and
• said second end portion of the rate shaping valve disposed in the cavity between the check and the first end portion of the rate shaping valve, said second end portion having a length shorter than a distance between the check and the first end portion of the rate shaping valve in their respective first positions, thereby limiting relative movement therebetween, wherein the rate shaping valve is displaced by the check as the check moves to a second position in which the first end portion of the rate shaping valve is held against the control port seat.

A nozzle and tip assembly adapted for a fuel injector unit, comprising:

• a check housing defining an internal cavity and at least one spray orifice;
• a check disposed in the internal cavity and having an end portion operably blocking the at least one spray orifice;
• a reciprocal plunger defining a fuel plunger chamber fluidly connected with the end portion of the check;
• a stop fixed relative to the check housing which defines a control port therein fluidly connected to the fuel plunger chamber;
• and
• a valve having a first position seated in the control port to limit check movement and having a second position spaced from the control port to allow fuel to flow therepast from the fuel plunger chamber, thereby decreasing the initial rate of fuel injection through the at least one orifice by diverting fuel therefrom.