US3834838A - Method of an apparatus for filling a fuel injection pump - Google Patents

Method of an apparatus for filling a fuel injection pump Download PDF

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Publication number
US3834838A
US3834838A US00237141A US23714172A US3834838A US 3834838 A US3834838 A US 3834838A US 00237141 A US00237141 A US 00237141A US 23714172 A US23714172 A US 23714172A US 3834838 A US3834838 A US 3834838A
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US
United States
Prior art keywords
piston
fuel
filling
cylinder
dead center
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00237141A
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English (en)
Inventor
J Indra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vysoke Uceni Technicke V Brne
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Vysoke Uceni Technicke V Brne
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages

Definitions

  • ABSIRA CT Method of and apparatus for filling a piston fuel injection pump of internal combustion engines with fuel [30] Forelgn Apphcauon Pm mty Data The fuel is fed through a side filling channel into a Mar. 24, Czechoslovakia pace over the piston is under negative gauge pressure during the movement of said piston to its U-S. lower dead center as we as during its movement to- [51] Int. Cl.
  • the volume of fuel 2,522,390 9/1950 Peterson 417/252 x flowing through t filling Channel is adjustable y 2,642,804 0/1953 Bowers 417/252 varying the entermg pressure of the fuel.
  • the present invention relates to a method of filling a piston fuel injection pump for internal combustion engines, and to an injection pump for performing such method.
  • the volume of injected fuel charges of known piston injection pump delivered by one piston stroke is changed by means of turning the piston, which is made as a sleeve valve in its upper part, and is provided with a helical change regulating edge.
  • the pump cylinder is provided with at least one radial filling channel. As the pump piston moves from its lower dead center, the fuel which has been sucked into the cylinder through the said filling channel is bypassed back to the fuel source until the upper edge of the piston covers that channel. Subsequently, an effective discharge of the pump into the delivery conduit and to the delivery nozzle begins; the discharge lasts until the regulating edge of the piston has uncovered the said filling channel again. From this moment on, until the upper dead center of the piston is reached, the fuel from the cylinder is again by passed to the fuel source, i.e., filling chamber through the filling channel.
  • the main feature of this system consists in that a part of the discharged fuel is bypassed before, and a part of the fuel is bypassed after the effective discharge.
  • the bypassing of fuel, especially after the effective discharge has been terminated, is performed at high speeds, particularly in the case of large pumps; this is the case of cavitation erosion on the sealing surface of the piston above the regulating edge.
  • the damage to the sealing surface of the piston due to this type of erosion is so severe that the piston must periodically be exchanged.
  • an object of the present invention to create a pump without any bypassing of fuel from the cylinder before or after the effective discharge of fuel, thus preventing the above-discussed cavitation erosion from taking place, while insuring excellent piston tightness both for large and for small charges of injected fuel.
  • the fuel is fed to the negative gauge pressure area above the piston through the side filling channel during the displacement of the piston to the lower dead center and also during movement of the piston toward its upper dead center, until the filling channel is covered by the edge of the piston, while there is still negative gauge pressure, that is, sub-atmospheric pressure, in the area above the piston.
  • the negative gauge pressure in the pump cylinder disappears, and the fuel starts being discharged into the delivery conduit; the volume of fuel flowing through the filling channel is adjustable, so as to vary the volume of the fuel charges.
  • An object of the apparatus for performing the method according to the present invention consists in that the body is provided with a filling channel preceded by a throttling nozzle or orifice providing means, said channel being connected with the filling chamber.
  • FIG. 1 diagrammatically shows the axial section of the whole injection pump
  • FIG. 2 is a view in section on an enlarged scale of a part of the pump around the filling channel.
  • a smooth piston lapped into the pump body 2 is pushed to displacement by the cam 3 through the action of the lifting element 4 with a roller, the piston being returned directly by a coil compression spring 5.
  • a relief delivery valve 6 of known construction represented as a ball valve in order to simplify the drawing, is accommodated in the body 2 above the piston 1.
  • a lateral filling channel 7 debouches into the area above the piston, said filling channel being drilled in the body 2, preceded by a throttle nozzle or orifice providing insert 8.
  • Means is providedto deliver fuel at a controlled constant pressure to a filling chamber 9 in the body 2 in advance of the throttling nozzle8.
  • a conventional constant pressure outlet valve 15 interposed in the conduit 14 which supplies fuel to filling chamber 9.
  • valve 15 delivers fuel under constant pressure, such constant pressure being adjustable by adjustment of valve 15.
  • the fuel discharge by piston 1 through the delivery valve 6 is delivered through the channel 10 and the adjacent discharge piping 12 to an injection nozzle (not shown).
  • the value of the pressure of the fuel fed to the filling chamber 9 is controlled so as always to prevent the evacuated space above the piston 1 from being filled with liquid fuel during the filling period when. theengine. is running. For that reason the piston 1 must perform, in addition, a certain stroke a (FIG. 2) during its movement upwards, in order that the fuel vapors above the piston 1 may disappear and the whole space above the piston 1 shall become filled with liquid fuel only.
  • the injection pump is to deliver smaller injection charges of fuel than the rated charge, fuel is brought to the filling chamber 9 under decreased over pressure. During the filling period, then, a smaller volume of fuel streams to the low pressure space above the piston l and, consequently, the fuel vapors during the subsequent pulling stroke of the piston 1 disappear later, thus leaving only a smaller stroke of piston l for effective fuel displacement. If the fuel delivery into the filling chamber 9 is cut, the delivery of fuel to the injection pump is stopped. For the starting speed of the engine, such filling of the space above the piston l with liquid fuel can be obtained by adjusting the pressure in the filling chamber 9 so that effective fuel displacement begins immediately after the channel 7 has been covered by the upper edge 11 of the piston 1. Thus an increase of the starting charge delivery as compared to the rated charge delivery is reached, which contributes to the facilitating of cold engine starts.
  • a reciprocating piston fuel injection pump for in ternal combustion engines comprising a pump cylinder, a piston reciprocable in the cylinder between its upper dead center and its lower dead center, means for reciprocating the piston, a side filling channel in the cylinder intermediate the upper and lower dead centers of reciprocation of the piston therein, the cylinder and the fluid displacing end to the piston presenting a space therebetween, the fluid displacing end of the piston having an edge which covers and seals the filling channel during movement of the piston toward its upper dead center, a fuel filling chamber external of the cylinder, a fuel conducting conduit means between the filling chamber and the end of the filling channel removed from the space in the cylinder, a throttling orifice means interposed in said conduit means, and means to subject the fuel in the filling chamber to positive pressure, the parts being so constructed and arranged that negative gauge pressure exists in the space in the cylinder when the filling channel is completely covered by said edge of the piston during the upward movement of the piston, and negative gauge pressure is eliminated
  • a fuel injection pump according to claim 1, comprising means to vary the pressure to which the fuel is subjected in the filling chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
US00237141A 1971-03-24 1972-03-22 Method of an apparatus for filling a fuel injection pump Expired - Lifetime US3834838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS212871 1971-03-24

Publications (1)

Publication Number Publication Date
US3834838A true US3834838A (en) 1974-09-10

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ID=5357493

Family Applications (1)

Application Number Title Priority Date Filing Date
US00237141A Expired - Lifetime US3834838A (en) 1971-03-24 1972-03-22 Method of an apparatus for filling a fuel injection pump

Country Status (13)

Country Link
US (1) US3834838A (enExample)
AT (1) AT316222B (enExample)
BR (1) BR7201713D0 (enExample)
CH (1) CH538050A (enExample)
DD (1) DD97027A5 (enExample)
DE (1) DE2214184A1 (enExample)
ES (2) ES401054A1 (enExample)
FR (1) FR2131608A5 (enExample)
GB (1) GB1368534A (enExample)
IT (1) IT950680B (enExample)
NL (1) NL7203728A (enExample)
RO (1) RO56413A (enExample)
YU (1) YU33409B (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5261795A (en) * 1989-06-01 1993-11-16 Sedepro Volumetric pump and process for volumetric pumping
US6390072B1 (en) 2000-05-30 2002-05-21 Robert H. Breeden Pump assembly
US6427663B1 (en) 2000-12-08 2002-08-06 Robert H. Breeden Inlet throttle pump assembly for diesel engine and method
US6622706B2 (en) 2000-05-30 2003-09-23 Robert H. Breeden Pump, pump components and method
US7025044B1 (en) 2003-07-16 2006-04-11 R. H. Sheppard Co., Inc. Pump assembly and method
US9103307B2 (en) 2008-11-26 2015-08-11 Continental Automotive Gmbh High-pressure pump arrangement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006022868A1 (de) * 2006-05-16 2007-11-22 Siemens Ag Radialkolbenpumpe zur Kraftstoff-Hochdruckversorgung bei einer Brennkraftmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522890A (en) * 1945-08-22 1950-09-19 Adolphe C Peterson Fuel metering, distribution, and control means
US2642804A (en) * 1950-03-31 1953-06-23 Dowty Equipment Ltd Hydraulic power unit
US2727498A (en) * 1953-02-25 1955-12-20 Cummins Engine Co Inc Fuel supply apparatus for an internal combustion engine
US2810376A (en) * 1954-07-29 1957-10-22 Bosch Gmbh Robert Injection pump
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment
FR1357519A (fr) * 1963-05-29 1964-04-03 Barmag Barmer Maschf Procédé pour l'amortissement des bruits dans les installations hydrauliques à accumulateur de véhicules, notamment de véhicules automobiles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522890A (en) * 1945-08-22 1950-09-19 Adolphe C Peterson Fuel metering, distribution, and control means
US2642804A (en) * 1950-03-31 1953-06-23 Dowty Equipment Ltd Hydraulic power unit
US2727498A (en) * 1953-02-25 1955-12-20 Cummins Engine Co Inc Fuel supply apparatus for an internal combustion engine
US2810376A (en) * 1954-07-29 1957-10-22 Bosch Gmbh Robert Injection pump
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment
FR1357519A (fr) * 1963-05-29 1964-04-03 Barmag Barmer Maschf Procédé pour l'amortissement des bruits dans les installations hydrauliques à accumulateur de véhicules, notamment de véhicules automobiles

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5261795A (en) * 1989-06-01 1993-11-16 Sedepro Volumetric pump and process for volumetric pumping
US6390072B1 (en) 2000-05-30 2002-05-21 Robert H. Breeden Pump assembly
US6460510B1 (en) 2000-05-30 2002-10-08 Robert H. Breeden Pump assembly and method
US6622706B2 (en) 2000-05-30 2003-09-23 Robert H. Breeden Pump, pump components and method
US6662784B1 (en) 2000-05-30 2003-12-16 Robert H. Breeden Pump assembly, valve and method
US6427663B1 (en) 2000-12-08 2002-08-06 Robert H. Breeden Inlet throttle pump assembly for diesel engine and method
US7025044B1 (en) 2003-07-16 2006-04-11 R. H. Sheppard Co., Inc. Pump assembly and method
US9103307B2 (en) 2008-11-26 2015-08-11 Continental Automotive Gmbh High-pressure pump arrangement

Also Published As

Publication number Publication date
ES430023A1 (es) 1976-09-16
DD97027A5 (enExample) 1973-04-12
YU74972A (en) 1976-06-30
CH538050A (de) 1973-06-15
BR7201713D0 (pt) 1973-05-24
AT316222B (de) 1974-06-25
ES401054A1 (es) 1975-05-16
YU33409B (en) 1976-12-31
FR2131608A5 (enExample) 1972-11-10
GB1368534A (en) 1974-09-25
DE2214184A1 (de) 1972-10-12
NL7203728A (enExample) 1972-09-26
IT950680B (it) 1973-06-20
RO56413A (enExample) 1974-07-01

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