초록 ▼

A fuel injection pump, preferably for use with relatively large diesel engines employing heavy diesel fuel, includes a pump body that defines a portion of a fuel pressurization chamber in fluid communication with a fuel outlet and a spill passage. The pump body also defines a pressure control chambe

A fuel injection pump, preferably for use with relatively large diesel engines employing heavy diesel fuel, includes a pump body that defines a portion of a fuel pressurization chamber in fluid communication with a fuel outlet and a spill passage. The pump body also defines a pressure control chamber and an actuation fluid passage. A spill valve member, which has a pressure surface is exposed to fluid pressure in the pressure control chamber and is moveable between an inject position that blocks the spill passage and a spill position that opens the spill passage. An electronically controlled valve has a control valve member that is moveable between a first position in which the actuation fluid passage is open to the pressure control chamber, and a second position in which the actuation fluid passage is blocked to the pressure control chamber.

대표청구항 ▼

[ We claim:] [1.] A heavy diesel fuel injection pump comprising:a pump body defining a heavy diesel fuel inlet, a heavy diesel fuel outlet, a tappet opening, a connection passage, a spill passage and a plunger bore;a tappet positioned in said tappet opening and moveable between a retracted position

[ We claim:] [1.] A heavy diesel fuel injection pump comprising:a pump body defining a heavy diesel fuel inlet, a heavy diesel fuel outlet, a tappet opening, a connection passage, a spill passage and a plunger bore;a tappet positioned in said tappet opening and moveable between a retracted position and an advanced position;a plunger positioned in said plunger bore and being attached to move with said tappet between said retracted position and said advanced position;a portion of said plunger and said plunger bore defining a fuel pressurization chamber connected to said heavy diesel fuel outlet by said connection passage;said spill passage being separated from said connection passage by a valve seat;an electronically controlled valve attached to said pump body and having a spill valve member and a solenoid;said solenoid including moveable components isolated from contact with heavy diesel fuel passing through said pump body; andsaid spill valve member being moveable between an inject position in which said spill valve member is seated against said valve seat, and a spill position in which said spill valve member is away from said valve seat.