Fuel injection pump of the distribution type
AssigneeNippondenso Co., Ltd.
InventorsToshihiko Ohmori, Sinya Sumitani, Takio Tani, Masahiko Miyaki, Akira Masuda
Life of this patent
Estimating the term…
Abstract
A distribution type fuel injection pump includes a control cylindrical bore into which a control plunger is fitted. The control plunger partitions the control cylindrical bore into first and second chambers. The same pressure as that of fuel in the pumping chamber (which serves to feed fuel) is transmitted to the first chamber, while fuel is supplied to the second chamber through a control passage. An electromagnetic valve is arranged in the control passage and the amount of fuel with which the second chamber is filled is adjusted by controlling the electromagnetic valve.
Claims16
A distribution type fuel injection pump for delivering fuel to each of the combustion chambers in an internal combustion engine comprising:
- pump housing means including a pumping head in which a pumping chamber is defined;
- first fuel supply means for supplying fuel to the pumping chamber;
- fuel pressurizing means for applying pressure to the fuel in the pumping chamber;
- distributor means for distributing and delivering the fuel, which has been pressurized in the pumping chamber, to each of the combustion chambers in the engine;
- control plunger means actuated by the fuel pressure in the pumping chamber and including a control cylinder bore defined in the pumping head and a control plunger fitted into the control cylinder bore, the control cylinder bore being partitioned into a first chamber to which the fuel pressure in the pumping chamber is transmitted and which serves to apply this pressure to one end of the control plunger, and a second chamber defined by the other end of the control plunger;
- second fuel supply means for supplying an adjusted amount of fuel to the second chamber and including a control passage connected to the second chamber and an electromagnetic valve for opening and closing the control passage;
- and
- escaping means for allowing the fuel to escape from the second chamber when the fuel pressure in the second chamber becomes higher than a certain value.
A distribution type fuel injection pump for delivering fuel to each of the combustion chambers in an internal combustion engine comprising:
- pump housing means including a pumping head in which a pumping chamber is defined;
- first fuel supply means for supplying fuel to the pumping chamber;
- pumping plunger means for pressurizing the fuel in the pumping chamber and including at least a pumping plunger and cam means for reciprocating the pumping plunger in response to the engine rotation;
- distributor means for distributing and delivering the fuel, which has been pressurized in the pumping chamber, to each of the combustion chambers in the engine;
- control plunger means actuated by the fuel pressure in the pumping chamber and including a control cylinder bore defined in the pumping head and a control plunger fitted into the control cylinder bore, the control cylinder bore partitioned by the control plunger into a first chamber to which the fuel pressure in the pumping chamber is transmitted and which serves to apply this pressure to one end of the control plunger, and a second chamber defined by the other end of the control plunger;
- second fuel supply means for supplying an adjusted amount of fuel to the second chamber and including a control passage connected to the second chamber, and an electromagnetic valve for opening and closing the control passage;
- and
- escaping means for allowing the fuel to escape from the second chamber when the fuel pressure in the second chamber becomes higher than a certain value.
Dependencies are inferred from the claim text.