EP0441217A1 - Kolben für eine Kraftstoffeinspritzpumpe - Google Patents

Kolben für eine Kraftstoffeinspritzpumpe Download PDF

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Publication number
EP0441217A1
EP0441217A1 EP19910101089 EP91101089A EP0441217A1 EP 0441217 A1 EP0441217 A1 EP 0441217A1 EP 19910101089 EP19910101089 EP 19910101089 EP 91101089 A EP91101089 A EP 91101089A EP 0441217 A1 EP0441217 A1 EP 0441217A1
Authority
EP
European Patent Office
Prior art keywords
plunger
fuel injection
fuel
injection pump
lead
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.)
Granted
Application number
EP19910101089
Other languages
English (en)
French (fr)
Other versions
EP0441217B1 (de
Inventor
Hidekatsu C/O Zexel Corp. Higashi Yashiro
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.)
Bosch Corp
Original Assignee
Zexel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zexel Corp filed Critical Zexel Corp
Publication of EP0441217A1 publication Critical patent/EP0441217A1/de
Application granted granted Critical
Publication of EP0441217B1 publication Critical patent/EP0441217B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to the plunger of a fuel injection pump of a diesel engine, and more particularly to a fuel injection pump plunger which enables the timing of the fuel injection to be controlled and facilitates engine performance recovery in when the engine is running under full load.
  • Adjustment and control of the timing at which the injection of the fuel is started and stopped are done by providing upper and lower leads in the head of the plunger and adjusting the relative positional relationship between these leads and the fuel intake and exhaust port formed in the barrel.
  • the head of the plunger is provided with a sloping lower lead and a longitudinal groove which connects the lower lead to the plunger chamber.
  • An upper lead is formed sloping down from the upper face of the plunger facing the plunger chamber at a position of vertical opposition to the lower lead.
  • engine noise can be reduced by adjusting the upper lead to retard the timing of the fuel injection by an amount corresponding to the engine load.
  • rapid idling regions meaning regions in which exceeding the rated engine speed causes the governor mechanism to reduce the fuel injection amount
  • this gives rise to a smokey exhaust caused by fuel which has not undergone complete combustion being emitted through the still-open exhaust port.
  • the provision of the orifice portion after the end of the upper lead in accordance with the present invention makes it possible to suppress extreme changes in the effective stroke, and as a result it is possible to suppress degradation of engine recovery when the engine is running under full-load conditions.
  • adjusting the plunger prestroke is facilitated by enabling the orifice portion to be used for the adjustment.
  • a head 2 of a plunger 1 can rotate and reciprocate within a plunger barrel 3.
  • Fuel from a high-pressure plunger chamber (fuel pressure chamber) 4 is passed through a fuel outlet 5 and emitted from a fuel injection nozzle (not shown).
  • a fuel port 6 is provided in the barrel 3.
  • the plunger head 2 is provided with a longitudinal groove 7 which connects the plunger chamber to a sloping lower lead 8 also formed in the head 2.
  • This lower lead 8 is for controlling the fuel injection end timing. Specifically, the amount of fuel that is injected is controlled by the rotation in either direction of the plunger 1 which, by raising the plunger 1 and thus changing the period of communication between the lower lead 8 and the fuel port 6, adjusts the effective fuel injection stroke.
  • the upper part of the orifice flat 10 opens into the plunger chamber 4.
  • the relationship between the width F of the flat 10 and the width L of the upper lead 9 is L>F.
  • the widths F and L are therefore set at values which ensure the required orifice effect of the flat 10 is attained during the delivery of the fuel accompanying the elevation of the plunger 1.
  • the descent of the plunger 1 thus configured causes fuel to be sucked through the fuel port 6 into the plunger chamber 4. Compression of the fuel for the injection process starts when as a result of the elevation of the plunger 1 the upper face 1A and upper lead 9 reach the upper edge 6A, closing the fuel port 6, and the release pressure of the fuel injection nozzle valve is exceeded.
  • the prestroke of the plunger 1 is defined as the distance between the bottom dead center of the plunger and the point at which the upper face 1A and upper lead 9 reach the top edge 6A of the fuel port 6.
  • the continuing rise of the plunger 1 brings the lower edge 6B of the fuel port 6 to the position of the lower lead 8, thereby connecting the fuel port 6 to the longitudinal groove 7 and stopping the fuel injection.
  • the timing of this termination of the fuel injection is controlled by the operation of a fuel injection amount control rack 13 linked to an accelerator 12 to change the rotational position of the plunger 1 relative to the barrel 3, i.e. the relative positional relationship between the fuel port 6 and the lower lead 8.
  • This also changes the position of the upper lead 9 relative to the fuel port 6, so that when pressing the accelerator 12 is used to rotate the plunger 1 to the left (with reference to Figure 1), the result is that the plunger 1 prestroke is lengthened, retarding the fuel injection timing. This means that, as indicated by Figure 3, increasing the engine load retards the fuel injection timing.
  • the ridge line 11 is set as the zero advance point, and when this is exceeded by full-load engine operation, the timing is advanced by the orifice effect of the flat 10, as indicated by the solid line.
  • the broken line in Figure 3 indicates the retardation state in the case of a conventional plunger not having a flat 10; this shows that retardation is increased with the increase in the engine load.
  • the timing can be advanced even during full-load operation, so engine recovery is rapid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
EP19910101089 1990-02-09 1991-01-28 Kolben für eine Kraftstoffeinspritzpumpe Expired - Lifetime EP0441217B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1990011570U JP2511197Y2 (ja) 1990-02-09 1990-02-09 燃料噴射ポンプのプランジャ
JP11570/90U 1990-02-09

Publications (2)

Publication Number Publication Date
EP0441217A1 true EP0441217A1 (de) 1991-08-14
EP0441217B1 EP0441217B1 (de) 1993-12-01

Family

ID=11781588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910101089 Expired - Lifetime EP0441217B1 (de) 1990-02-09 1991-01-28 Kolben für eine Kraftstoffeinspritzpumpe

Country Status (3)

Country Link
EP (1) EP0441217B1 (de)
JP (1) JP2511197Y2 (de)
DE (1) DE69100693T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2728025A1 (fr) * 1994-12-09 1996-06-14 Bosch Gmbh Robert Pompe d'injection de carburant pour moteur a combustion interne, comprenant plusieurs zones de debut d'injection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT311727B (de) * 1971-11-04 1973-11-26 List Hans Einspritzpumpe für Dieselmotoren
DE3332470A1 (de) * 1982-09-08 1984-03-08 Steyr-Daimler-Puch AG, 1011 Wien Kolbeneinspritzpumpe mit schraegkantensteuerung, insbesondere fuer dieselmotoren

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51146626A (en) * 1975-05-27 1976-12-16 Hino Motors Ltd Fuel pump plunger of diesel engine
JPS5946363A (ja) * 1982-09-10 1984-03-15 Diesel Kiki Co Ltd 燃料噴射ポンプ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT311727B (de) * 1971-11-04 1973-11-26 List Hans Einspritzpumpe für Dieselmotoren
DE3332470A1 (de) * 1982-09-08 1984-03-08 Steyr-Daimler-Puch AG, 1011 Wien Kolbeneinspritzpumpe mit schraegkantensteuerung, insbesondere fuer dieselmotoren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2728025A1 (fr) * 1994-12-09 1996-06-14 Bosch Gmbh Robert Pompe d'injection de carburant pour moteur a combustion interne, comprenant plusieurs zones de debut d'injection

Also Published As

Publication number Publication date
DE69100693T2 (de) 1994-03-31
JP2511197Y2 (ja) 1996-09-18
DE69100693D1 (de) 1994-01-13
JPH03104169U (de) 1991-10-29
EP0441217B1 (de) 1993-12-01

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