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Title: Distributor-type fuel injection pump with preliminary injection control device

Abstract

A distributor-type fuel injection pump is described for an internal combustion engine having at least one cylinder, the fuel injection pump comprising: (a) a housing having a fuel chamber defined therein; (b) fuel supply means for supplying fuel to the fuel chamber under pressure dependent upon engine r.p.m.; (c) a barrel mounted within the housing and having a distribution hole communicating with the engine cylinder; (d) a plunger mounted within the barrel for axial and rotary motion therein and defining jointly with the barrel a pump working chamber communicating with the fuel chamber. The plunger has a main discharge port communicating at one end with the pump working chamber and alignable with the distribution hole for effecting a main fuel injection, and a preliminary discharge port communicating with the pump working chamber and alignable with the distribution hole before the alignment of the main discharge port with the distribution hole, thereby effecting a preliminary fuel injection before the main injection; and (e) means operatively connected with the plunger and actuatable in response to pressure within the fuel chamber, for controlling fuel injection timing. The control means includes a first means, actuatable in response to the pressure within the fuel chamber,more » for effecting the preliminary fuel injection when the pressure within the fuel chamber is at less than a predetermined value, and a second means, actuatable in response to the pressure within the fuel chamber, for preventing the preliminary fuel injection when the pressure within the fuel chamber is above the predetermined value.« less

Inventors:
;
Publication Date:
OSTI Identifier:
6885419
Patent Number(s):
US 4635599
Assignee:
Diesel Kiki Co., Ltd., Tokyo NOV; NOV-87-044113; EDB-87-045797
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 13 Jun 1985
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; INTERNAL COMBUSTION ENGINES; CONTROL SYSTEMS; FUEL INJECTION SYSTEMS; ALIGNMENT; CYLINDERS; PRESSURE DEPENDENCE; PRESSURE EFFECTS; PUMPS; ROTATION; TIMING CIRCUITS; ELECTRONIC CIRCUITS; ENGINES; FUEL SYSTEMS; HEAT ENGINES; MOTION 330100* -- Internal Combustion Engines

Citation Formats

Taira, S., and Ishibashi, T. Distributor-type fuel injection pump with preliminary injection control device. United States: N. p., 1987. Web.
Taira, S., & Ishibashi, T. Distributor-type fuel injection pump with preliminary injection control device. United States.
Taira, S., and Ishibashi, T. 1987. "Distributor-type fuel injection pump with preliminary injection control device". United States. doi:.
@article{osti_6885419,
title = {Distributor-type fuel injection pump with preliminary injection control device},
author = {Taira, S. and Ishibashi, T.},
abstractNote = {A distributor-type fuel injection pump is described for an internal combustion engine having at least one cylinder, the fuel injection pump comprising: (a) a housing having a fuel chamber defined therein; (b) fuel supply means for supplying fuel to the fuel chamber under pressure dependent upon engine r.p.m.; (c) a barrel mounted within the housing and having a distribution hole communicating with the engine cylinder; (d) a plunger mounted within the barrel for axial and rotary motion therein and defining jointly with the barrel a pump working chamber communicating with the fuel chamber. The plunger has a main discharge port communicating at one end with the pump working chamber and alignable with the distribution hole for effecting a main fuel injection, and a preliminary discharge port communicating with the pump working chamber and alignable with the distribution hole before the alignment of the main discharge port with the distribution hole, thereby effecting a preliminary fuel injection before the main injection; and (e) means operatively connected with the plunger and actuatable in response to pressure within the fuel chamber, for controlling fuel injection timing. The control means includes a first means, actuatable in response to the pressure within the fuel chamber, for effecting the preliminary fuel injection when the pressure within the fuel chamber is at less than a predetermined value, and a second means, actuatable in response to the pressure within the fuel chamber, for preventing the preliminary fuel injection when the pressure within the fuel chamber is above the predetermined value.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1987,
month = 1
}
  • A distributor-type fuel injection pump is described for an internal combustion engine, comprising: a pump housing: a suction space defined within the pump housing and filled with fuel having a pressure variable as a function of the rotational speed of the engine; a timer piston displaceable in response to a change in the fuel pressure; means for controlling the fuel injection timing of the fuel injection pump in response to displacement of the timer piston; and drain passage means partly formed in the timer piston for permanently communicating the suction space with a zone under a lower pressure, the drainmore » passage means having a restricting portion disposed to restrict the flow rate of fuel flowing therethrough from the suction space to the zone under a lower pressure when the timer piston is positioned within a region corresponding to a particular rotational speed region of the engine.« less
  • This patent describes a distributor-type fuel injection pump for an internal combustion engine having a plurality of cylinders and a plurality of fuel injection valves for injecting fuel into respective ones of the cylinders. The fuel injection pump includes a plunger arranged for concurrent reciprocating and rotative motion in response to rotation of the engine to perform pressure delivery and distribution of fuel into the cylinders of the engine. The plunger has a first portion and a second portion having different diameters from each other, a first pump working chamber defined by the first portion, and a second pump workingmore » chamber defined by the second portion. Fuel delivery passageways are arranged for communication with the first pump working chamber and lead to respective ones of the fuel injection valves of the engine. A communication passageway is arranged for communicating the second pump working chamber with the fuel delivery passageways and a drain passageway is arranged for communicating the communication passageway with a zone under a lower pressure of the pump.« less
  • This patent describes an injection timing control device for combination with a fuel injection pump for an internal combustion engine, the pump being of the type having a suction space filled with fuel under pressure variable as a function of the rotational speed of the engine, a pumping and distributing plunger, and a roller holder carrying rollers circumferentially arranged and disposed in camming engagement with the plunger the injection timing control device comprising: a cylinder; a timer piston slidably received within the cylinder. The timer piston is coupled to the roller holder such that displacement thereof causes a corresponding changemore » in the cicumferential position of the roller holder,; a first chamber defined at one end of the timer piston; a second chamber defined at one end of the timer piston; a second chamber defined at an opposite end of the timer piston.« less
  • A fuel injection apparatus is described comprising: (a) retarding means for, in a low range of engine loading, substantially retarding fuel injection timing by diminishing the advancing rate of the injection timing advancing means lower than a predetermined advancing rate for a high range of engine loading; (b) varying means for, in the low range of engine loading, continuously varying the advancing rate of the injection timing advancing means between the diminished advancing rate and a mostly advanced rate higher than the predetermined advancing rate of the injection timing advancing means; (c) pressure sensitive means for forcing the varying meansmore » to effect continuous variation of the advancing rate of the injection timing advancing means in accordance with atmospheric pressure; (d) first advancing rate varying means for, in the high range of engine loading, maintaining the advancing rate of the injection timing advancing means substantially at the predetermined advancing rate, and (e) second advancing rate varying means for, in the range of engine loading between the low and high ranges of engine loading.« less
  • A distributor type fuel injection pump for distributing and supplying pressurized fuel into combustion chambers of an internal combustion engine, is described comprising: a rotor driven to be rotated; a pair of plungers slidably reciprocated in a radial direction and coaxially with each other in the rotor, the plungers defining a pump chamber therebetween; a shuttle cylinder portion in which a cylinder bore is defined; a shuttle piston movably disposed in the cylinder bore and dividing the interior of the cylinder bore into first and second pressure chambers; connecting means for continuously connecting the pump chamber and the second pressuremore » chamber; supply means for supplying the fuel into the pump chamber and the second pressure chamber through the connecting means and also supplying the fuel into the first pressure chamber.« less