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Title: Fuel injection device

Abstract

A fuel injection device is described for injecting fuel into a combustion chamber of an internal combustion engine, comprising: a body having first and second bores formed therein and extending in the axial direction thereof; a delivering plunger fitted into the first bore and defining a delivering pump chamber therein; driving means for reciprocating the delivering plunger in synchronism to the engine; pressurized medium supplying means for supplying a pressurized medium under a constant pressure to the delivering pump chamber, the pressurized medium supplying means including a pressurized medium source and a control passage linking the pressurized medium source to the delivering pump chamber; an electromagnetic valve provided on the control passage for opening and closing the control passage; and an injection plunger fitted into the second bore and defining, in the second bore, a linking chamber communicating with the delivering pump chamber and an injection pump chamber, the linking chamber and the delivering chamber becoming a liquid-tight chamber when the electromagnetic valve closes the control passage.

Inventors:
; ;
Publication Date:
OSTI Identifier:
6589645
Patent Number(s):
US 4653448
Assignee:
Nippondenso Co., Ltd., Kariya NOV; NOV-87-055314; EDB-87-087731
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 19 Feb 1985
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; INTERNAL COMBUSTION ENGINES; FUEL INJECTION SYSTEMS; VEHICLES; COMBUSTION CHAMBERS; ELECTROMAGNETS; NOZZLES; PRESSURIZING; PUMPS; SYNCHRONIZATION; VALVES; VOLUME; CONTROL EQUIPMENT; ELECTRICAL EQUIPMENT; ENGINES; EQUIPMENT; FLOW REGULATORS; FUEL SYSTEMS; HEAT ENGINES; MAGNETS 330100* -- Internal Combustion Engines

Citation Formats

Ohmori, T., Nakatsuka, H., and Kanou, H. Fuel injection device. United States: N. p., 1987. Web.
Ohmori, T., Nakatsuka, H., & Kanou, H. Fuel injection device. United States.
Ohmori, T., Nakatsuka, H., and Kanou, H. 1987. "Fuel injection device". United States. doi:.
@article{osti_6589645,
title = {Fuel injection device},
author = {Ohmori, T. and Nakatsuka, H. and Kanou, H.},
abstractNote = {A fuel injection device is described for injecting fuel into a combustion chamber of an internal combustion engine, comprising: a body having first and second bores formed therein and extending in the axial direction thereof; a delivering plunger fitted into the first bore and defining a delivering pump chamber therein; driving means for reciprocating the delivering plunger in synchronism to the engine; pressurized medium supplying means for supplying a pressurized medium under a constant pressure to the delivering pump chamber, the pressurized medium supplying means including a pressurized medium source and a control passage linking the pressurized medium source to the delivering pump chamber; an electromagnetic valve provided on the control passage for opening and closing the control passage; and an injection plunger fitted into the second bore and defining, in the second bore, a linking chamber communicating with the delivering pump chamber and an injection pump chamber, the linking chamber and the delivering chamber becoming a liquid-tight chamber when the electromagnetic valve closes the control passage.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1987,
month = 3
}
  • 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 portmore » 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.« 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 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 fuel injection system for an internal combustion engine having an output shaft rotating about a vertically extending axis and at least two horizontally extending in line cylinders, a fuel injection pump having a drive shaft, and means for driving the fuel injection pump drive shaft from the engine output shaft, the improvement comprising the fuel injection pump drive shaft being rotatable about a horizontally extending axis disposed between the upper and lower ends of the engine for maintaining substantially equal length delivery lines to each of the cylinders.
  • A distributor type fuel injection pump is disclosed for use with a diesel engine for successively supplying pressurized fuel to engine injectors in synchronism with engine rotation. The fuel injection pump includes an angularly movable control member adapted to determine the timing of fuel injection in accordance with its angular position. An injection timing control device is provided which comprises a casing, a piston drivingly connected to the control member and located for reciprocation within the casing to form two chambers at the respective ends thereof. The piston if formed therein with pressure passages communicating a pressure source with themore » pressure chambers, respectively. Control circuit means is provided which calculates an optimum injection timing value from various engine operating parameters and provides a control signal indicative of the calculated injection timing value. The control signal is applied to valve means which thereby varies the ratio between the effective areas of the pressure passages to create a pressure difference across the piston, whereby the piston moves to move the control member to an angular position corresponding to the calculated injection timing value.« less