Diesel fuel injection pump with electromagnetic fuel spilling valve having pilot valve providing high responsiveness
A fuel injection system for a diesel engine is described having a plurality of cylinders coupled to a crankshaft, the fuel injection system consisting of: a housing with a cylindrical bore formed therein; an input shaft mounted coaxially with the bore and rotatable in a predetermined phase relation with the crankshaft of the engine; a plunger slidably mounted in the bore, one end of the plunger defining with the bore a high pressure chamber, and another end of the plunger being rotationally engaged with the input shaft but being free to move axially with respect to the input shaft; means for axially reciprocating the plunger in the bore according to the rotational position of the plunger; means for communicating the high pressure chamber selectively with respective cylinders of the engine according to the rotational position of the plunger substantially only when the plunger is moving in a delivery stroke, axially in a direction to reduce the size of the high pressure chamber; a valve body having an internal chamber communicating with the high pressure chamber, with a vent passage leading from the internal chamber for venting the high pressure chamber; a valve element located in the internal chamber and having an orifice, one side of the orifice communicating with the high pressure chamber; and an electromagnetically operated pilot valve which is selectively electromagnetically driven when electrical energy is supplied thereto so as to close a normally open passage which vents a space on the other side of the orifice remote from the high pressure chamber.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha, Toyota
- Patent Number(s):
- US 4579096
- OSTI ID:
- 5702531
- Resource Relation:
- Patent File Date: Filed date 13 Sep 1984
- Country of Publication:
- United States
- Language:
- English
Similar Records
Solenoid-valve-controlled fuel injection device
Diesel fuel injection pump with electronically controlled fuel spilling and cutoff and recirculation venting of split fuel
Related Subjects
DIESEL ENGINES
FUEL INJECTION SYSTEMS
DESIGN
CONTROL SYSTEMS
CYLINDERS
ELECTRIC CURRENTS
ELECTROMAGNETISM
ORIFICES
PRESSURE EFFECTS
PUMPS
ROTATION
SHAFTS
VALVES
CONTROL EQUIPMENT
CURRENTS
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MAGNETISM
MOTION
OPENINGS
330102* - Internal Combustion Engines- Diesel