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Title: Diesel engine fuel injection pump capable of injection timing adjustment

Abstract

A diesel engine fuel injection pump capable of injection timing adjustment is described comprising: (a) housing means; (b) a plunger assembly reciprocably mounted within the housing means and defining a pumping chamber therein; (c) the housing means having defined therein a fuel inlet port to the pumping chamber in a predetermined position in the longitudinal direction of the pumping chamber; (d) drive means for reciprocably moving the plunger assembly within the pumping chamber between a first extreme position; (e) the plunger assembly being formed of at least two transversely split segments movable toward and away from each other within limits and including resilient means biasing the segments of the plunger assembly toward each other; and (f) the housing means further including a timing fluid inlet port for introduction of a timing fluid under variable pressure between the segments of the plunger assembly to move the plunger assembly segments away from each other to an extent that timing fluid pressure is counterbalanced by force of the resilient means for controllably varying the distance therebetween and, in consequence, for varying the prestroke of the plunger assembly solely in response to variation of the timing fluid pressure to effect adjustment of injection timing.

Inventors:
;
Publication Date:
OSTI Identifier:
5371621
Patent Number(s):
US 4712985
Assignee:
Kabushiki Kaisha Komatsu Seisakusho, Tokyo NOV; NOV-88-001085; EDB-88-073017
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 27 Jun 1986
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; DIESEL ENGINES; FUEL INJECTION SYSTEMS; PUMPS; DESIGN; HYDRAULICS; OPERATION; PRESSURIZING; PUMPING; TIMING PROPERTIES; ENGINES; FLUID MECHANICS; FUEL SYSTEMS; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; MECHANICS; 330102* - Internal Combustion Engines- Diesel

Citation Formats

Wakasa, S., and Okazaki, T.. Diesel engine fuel injection pump capable of injection timing adjustment. United States: N. p., 1987. Web.
Wakasa, S., & Okazaki, T.. Diesel engine fuel injection pump capable of injection timing adjustment. United States.
Wakasa, S., and Okazaki, T.. 1987. "Diesel engine fuel injection pump capable of injection timing adjustment". United States. doi:.
@article{osti_5371621,
title = {Diesel engine fuel injection pump capable of injection timing adjustment},
author = {Wakasa, S. and Okazaki, T.},
abstractNote = {A diesel engine fuel injection pump capable of injection timing adjustment is described comprising: (a) housing means; (b) a plunger assembly reciprocably mounted within the housing means and defining a pumping chamber therein; (c) the housing means having defined therein a fuel inlet port to the pumping chamber in a predetermined position in the longitudinal direction of the pumping chamber; (d) drive means for reciprocably moving the plunger assembly within the pumping chamber between a first extreme position; (e) the plunger assembly being formed of at least two transversely split segments movable toward and away from each other within limits and including resilient means biasing the segments of the plunger assembly toward each other; and (f) the housing means further including a timing fluid inlet port for introduction of a timing fluid under variable pressure between the segments of the plunger assembly to move the plunger assembly segments away from each other to an extent that timing fluid pressure is counterbalanced by force of the resilient means for controllably varying the distance therebetween and, in consequence, for varying the prestroke of the plunger assembly solely in response to variation of the timing fluid pressure to effect adjustment of injection timing.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1987,
month =
}
  • 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
  • An injection timing control system for a fuel-injection pump for an engine has a phase angle regulator for varying the rotational phase angle of a drive shaft of the fuel-injection pump in which a cylindrical extension of one of an input shaft adapted to be driven by the engine and an output shaft for driving the drive shaft of the pump surrounds an end portion of the other shaft in spaced apart relationship. A male spline is formed on the end portion over some axial length thereof while a female spline is formed on the extension over some axial lengthmore » thereof, at least one of the splines being a helical spline. A slider is located in an annular space between the splines and formed with splines meshing therewith respectively. An annular cylinder is formed between the substantial parts of the rest axial length portions of the extension and end portion, and a piston is reciprocally received in the cylinder, the slider and piston being formed as a unit. The system also has a hydraulic pump for supplying pressurized fluid to the cylinder, the hydraulic pump being mounted on a casing enclosing the extension and rotatably supporting the one shaft and extension and being operatively connected to the extension through gear means to be driven by rotation of the extension.« less
  • An injection timing control system for a fuel-injection pump for an engine has a phase angle regulator for varying the rotational phase angle of a drive shaft of the fuel-injection pump. The regulator has a cylindrical extension of one of an input shaft adapted to be driven by the engine and an output shafts for driving the drive shaft of the pump coaxially surrounding an end portion of the other shaft in spaced apart relationship. A male spline and female spline are formed respectively on the end portion and the extension over some axial length thereof, at least one ofmore » the splines being a helical spline. A slider is located in an annular space between the splines and formed with splines meshing therewith respectively. An annular cylinder is formed between the substantial parts of the rest axial length portions of the cylindrical extension and end portion. A piston is reciprocally received in the cylinder, the slider and piston being formed as a unit.« less
  • A method is described of controlling a fuel injection timing of a diesel engine. The maximum injection timing most suitable for the time when the fuel injection reaches the maximum quantity is determined as commensurate to at least an engine speed and an intake air pressure, and an injection timing is controlled in accordance with the maximum injection timing. The method comprises: a step of determining the basic maximum injection timing most suitable for the time when the fuel injection reaches the maximum quantity under the atmospheric pressure as commensurate to an engine speed; and a step of correcting themore » basic maximum injection timing at least by an intake air pressure to provide the maximum injection timing.« less
  • A fuel injection timing control system for a diesel engine has a fuel injection pump supplying fuel to the engine periodically according to the rotation of the engine crankshaft, and a device connected to the fuel injection pump to vary the fuel injection timing in terms of crank angle. The engine is equipped with an exhaust gas recirculation arrangement. A control unit is connected to the device and the arrangement to drive them in such a manner that when the arrangement is operative to effect the exhaust gas recirculation, the fuel injection timing is advanced compared to that under themore » condition where the exhaust gas recirculation arrangement is at rest suspending the exhaust gas recirculation.« less