Fuel injection pump for an internal combustion engine
This patent describes a fuel injection pump for an internal combustion engine comprising: a body having a cylinder bore, low pressure chamber, an overflow passage coupled to the cylinder bore and communicating with the low pressure chamber, and a feed passage formed in the cylinder bore and open to the cylinder bore; a plunger slidably housed in the cylinder bore to define a high pressure chamber therein; valve means for opening and closing the overflow passage to the cylinder bore according to a fuel pressure acting thereon, the valve means opening to cause undischarged surplus fuel to spill from the high pressure chamber through the overflow passage; a piezoelectric actuator attached to the body to expand and contract according to a voltage applied thereto to vary the fuel pressure in the control chamber and thereby open and close the valve means to control a fuel supply; and means for opening and closing the feed passage, the opening and closing means opening the feed passage to feed the low pressure fuel in the low pressure chamber to the control chamber through the overflow passage, the high pressure chamber and the feed passage on an intake action of the plunger and then closing the feed passage on an intake action of the plunger, and then closing the feed passage to hold the pressure in the control chamber at a desired value.
- Assignee:
- Nippon Soken, Inc., Nishio
- Patent Number(s):
- US 4793314
- OSTI ID:
- 6319827
- Resource Relation:
- Patent File Date: Filed date 2 Sep 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FUEL INJECTION SYSTEMS
PUMPS
ACTUATORS
CYLINDERS
DESIGN
INTERNAL COMBUSTION ENGINES
OPERATION
PIEZOELECTRICITY
PRESSURE CONTROL
PUMPING
VALVES
CONTROL
CONTROL EQUIPMENT
ELECTRICITY
ENGINES
EQUIPMENT
FLOW REGULATORS
FUEL SYSTEMS
HEAT ENGINES
330100* - Internal Combustion Engines