EP0288669B1 - Pompe à injection de combustible pour moteur diesel - Google Patents

Pompe à injection de combustible pour moteur diesel Download PDF

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Publication number
EP0288669B1
EP0288669B1 EP88101862A EP88101862A EP0288669B1 EP 0288669 B1 EP0288669 B1 EP 0288669B1 EP 88101862 A EP88101862 A EP 88101862A EP 88101862 A EP88101862 A EP 88101862A EP 0288669 B1 EP0288669 B1 EP 0288669B1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
pump piston
cylinder
adjusting sleeve
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
EP88101862A
Other languages
German (de)
English (en)
Other versions
EP0288669A1 (fr
Inventor
Hans Scherrer
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.)
Sulzer AG
Original Assignee
Gebrueder Sulzer AG
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 Gebrueder Sulzer AG filed Critical Gebrueder Sulzer AG
Publication of EP0288669A1 publication Critical patent/EP0288669A1/fr
Application granted granted Critical
Publication of EP0288669B1 publication Critical patent/EP0288669B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/121—Lost-motion device in the driving mechanism
    • 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
    • F02M59/28—Mechanisms therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control

Definitions

  • the invention relates to a fuel injection pump with the features of the preamble of claim 1.
  • the adjusting sleeve concentrically surrounds the pump piston and is connected to the pump piston in a rotationally fixed manner via a groove and a sliding wedge guided therein.
  • the adjusting sleeve has an external toothing which engages in a toothed rack on the regulating rod.
  • This swivel device consisting of regulating rod and adjusting sleeve serves to change the amount of fuel to be injected into the working cylinder of the reciprocating piston internal combustion engine depending on the load of the machine, by changing the position of the oblique control edges relative to the holes in the cylinder by the swiveling, so that the Shift start of delivery and / or end of delivery of the pump piston.
  • the size of the swivel range of the pump piston is limited due to the pump design and is approximately 60 °.
  • the course of the oblique control edges in the lateral surface of the pump piston thus extends over the range of 60 °.
  • the oblique control edges are relatively steep. Such a steep course results in an unfavorable reproducibility of the injected fuel quantity, i.e. there is a relatively large deviation of the delivery stroke of the pump piston, that is to say the injection quantity, from the position of the regulating rod.
  • Such deviations are e.g.
  • the invention has for its object to improve the injection pump of the type mentioned so that the disadvantages caused by the steep control edge course are avoided.
  • the larger swivel range of the pump piston now allows the course of the oblique control edges over a correspondingly larger circumference of the lateral surface of the To extend the pump piston so that - seen in the drawing - the control edges have a much smaller slope than before.
  • the disadvantages described in connection with the steep control edge profile of the known injection pumps are thus considerably reduced.
  • the deviations of the piston stroke due to the inaccuracies in the transmission path are therefore considerably smaller; the injection phase is ended more quickly because the piston stroke for the full opening of the overflow hole is reduced by the associated control edge.
  • a pump cylinder 2 is provided in a pump housing 1, which is fixed in the pump housing 1 by a pump housing cover 3.
  • a pump piston 4 is guided up and down, which is provided in its lateral surface near the upper piston end with control edges 5 which run obliquely to the longitudinal axis of the piston. These control edges cooperate in a known manner with two radial bores (not shown in FIG. 1) in the wall of the pump cylinder 2, as a result of which the start of delivery and the end of delivery of the pump piston 4 are determined.
  • the fuel to be injected is fed via an inlet line, also not shown in FIG.
  • the pump piston 4 has at its lower end protruding from the pump cylinder 2 a flange 9 with which it rests on a pump tappet 10 which is guided in the pump housing 1 so as to be axially movable.
  • the flange 9 is overlapped by a cap 11, which also surrounds part of the pump plunger 10 and on which the lower end of a compression spring 12 is supported.
  • the upper end of the compression spring 12 is supported on a spring plate 13 which is fixed in the pump housing 1.
  • a constant contact of the flange 9 on the pump tappet 10 is ensured by means of the compression spring 12.
  • a roller 14 is rotatably mounted therein, which rolls on a cam 15 of a camshaft that drives the pump piston 4 in time with the diesel engine.
  • the lower end of the pump cylinder 2 is surrounded by a sleeve 16, which at its lower end, which projects beyond the pump cylinder, is provided with two axial, diametrically opposite slots, into each of which a radial arm 17 of the pump piston 4 projects.
  • the axial length of the slots is at least the same as the maximum stroke of the pump piston 4.
  • the sleeve 16 has in its area above the slots an external toothing 18 which is in engagement with an internal toothing 19 which is provided in an adjusting sleeve 20 arranged eccentrically to the sleeve 16 and thus to the pump piston 4.
  • the Adjustment sleeve 20 is pivotally mounted in the pump housing 1 about its axis of rotation 21 (FIG. 3) and has a radially outwardly projecting stop tab 22 on its outer circumference. 1 is attached to the stop tab 22, which projects downward into a fork piece 24, which is adjustably fastened on a regulating rod 25 which can be moved back and forth transversely to the pump piston 4.
  • the regulating rod 25 By moving the regulating rod 25 by the amount "s" (FIG. 2), the adjusting sleeve 20 can thus be pivoted through an angle of approximately 60.degree of the driving pin 23 is shown in Fig. 2.
  • stop tab 22 is on a stop screw 26 which is attached to the pump housing 1.
  • the stop screw 26 is adjustable with the help of an adjusting nut 27.
  • the same arrangement of the stop screw and the adjusting nut is located on the opposite side of the swivel range of the adjusting sleeve 20 and interacts with the boundary surface 22 ⁇ of the stop tab 22.
  • the size of the path "s" and thus the size of the swivel range of the flap 22 is limited by the fact that the housing 1 cannot be weakened further in the area mentioned.
  • the pivoting movement of the adjusting sleeve 20 is translated into a larger adjusting movement of the sleeve 16 and thus of the pump piston 4.
  • the size of the pivoting movement of the sleeve 16 depends on the size of the eccentricity "e" (FIG. 3) between the longitudinal axis of the pump piston and the axis 21 of the adjusting sleeve 20. It can be reach maximum swivel range of approximately 120 ° of the sleeve 16 or the pump piston 4.
  • the lower half of the injection pump is inserted into an engine housing 30 in which the camshaft is also mounted. It is essential for the injection pump that the outer limit of the stop lug 22 lies within the diameter of the upper bore 31 in the engine housing that receives the pump housing 1, so that the injection pump can be easily installed and removed.
  • an injection pump is arranged in the engine housing in the manner described and there is an associated cam corresponding to cam 15 on the common camshaft.
  • the regulating rod 25 is also common to all working cylinders and has a fork piece 24 for each injection pump. By adjusting the fork pieces 24 relative to the regulating rod and adjusting the stop screws 26, the fuel quantities to be injected into the working cylinders can be made equal to one another.
  • the sleeve 16 In a departure from the exemplary embodiment described, it is also possible to omit the sleeve 16 and to provide its external toothing directly on the pump piston 4. In such a case, the outer toothing would have to be longer in the axial direction so that it remains in engagement with the inner toothing 19 of the adjusting sleeve 20 during the up and down movement of the pump piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Jet Pumps And Other Pumps (AREA)

Claims (6)

1. Pompe d'injection de carburant pour moteur à combustion interne à pistons alternatifs de type Diesel, comprenant au moins un piston (4) mobile alternativement dans un cylindre (2) et dont la surface circonférentielle comporte des rampes de commande (5) qui sont obliques par rapport à son axe de symétrie longitudinal et qui déterminent avec des lumières réalisées dans le cylindre (2) le début et la fin du refoulement produit par le piston (4), ladite pompe comprenant par ailleurs une douille de positionnement (20) entourant le piston (4) et coopérant avec une tige de réglage (25), qui est montée à l'extérieur du cylindre (2) et qui est capable d'effectuer des mouvements alternatifs rectilignes, afin de faire pivoter le piston (4), ladite pompe étant caractérisée en ce que la douille de positionnement (20) entoure le piston (4) de manière excentrée et comporte une denture interne (19), en ce qu'une denture extérieure (18) en prise avec cette denture interne est réalisée sur le piston (4) et en ce que la douille de positionnement (20) est reliée par articulation à la tige de réglage (25).
2. Pompe selon la revendication 1, comprenant un corps (1) qui loge le cylindre (2), dont l'extrémité inférieure entoure un poussoir (10) transmettant le mouvement alternatif au piston (4) et qui est encastré dans un carter du moteur (30) renfermant une commande de l'arbre à came, caractérisée en ce que le lieu de jonction entre la douille de positionnement (20) et la tige de réglage (25) se trouve à l'intérieur du contour du corps (1) de la pompe situé à l'intérieur du carter (30) du moteur.
3. Pompe selon la revendication 2, caractérisée en ce que la douille de positionnement (20) comporte du côté extérieur une patte de butée (22) qui coopère par ses deux surfaces extrêmes latérales (22′, 22˝) avec des butées (26) se trouvant sur le corps (1) de la pompe et délimitant la plage de pivotement de la douille de positionnement (20).
4. Pompe selon la revendication 3, caractérisée en ce que les butées (26) se trouvant sur le corps (1) de la pompe sont réglables.
5. Pompe selon la revendication 3, caractérisée en ce qu'une broche d'entraînement (23) fixée sur la patte de butée (22) pénètre dans une fourche (24) qui, de son côté, est fixée de manière réglable sur la tige de réglage (25).
6. Pompe selon l'une des revendications 1 à 5, caractérisée en ce que le piston est relié à un fourreau d'accouplement (16) dont la position axiale est fixe, qui est monté rotatif sur le cylindre (2) et dont le côté extérieur comporte ladite denture extérieure (18).
EP88101862A 1987-04-30 1988-02-09 Pompe à injection de combustible pour moteur diesel Expired - Lifetime EP0288669B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1652/87A CH672005A5 (fr) 1987-04-30 1987-04-30
CH1652/87 1987-04-30

Publications (2)

Publication Number Publication Date
EP0288669A1 EP0288669A1 (fr) 1988-11-02
EP0288669B1 true EP0288669B1 (fr) 1991-03-20

Family

ID=4215469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101862A Expired - Lifetime EP0288669B1 (fr) 1987-04-30 1988-02-09 Pompe à injection de combustible pour moteur diesel

Country Status (8)

Country Link
EP (1) EP0288669B1 (fr)
JP (1) JPS63272959A (fr)
CH (1) CH672005A5 (fr)
DE (1) DE3862056D1 (fr)
DK (1) DK164827C (fr)
ES (1) ES2022482B3 (fr)
FI (1) FI96535C (fr)
NO (1) NO168725C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103267012A (zh) * 2013-05-29 2013-08-28 宁波合力机泵有限公司 一种改变柱塞容积的流量调节装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5730104A (en) * 1997-02-19 1998-03-24 Caterpillar Inc. Injection rate shaping device for a fill metered hydraulically-actuated fuel injection system
JP7022380B2 (ja) * 2018-01-31 2022-02-18 いすゞ自動車株式会社 燃料ポンプ組付構造

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1054199A (fr) * 1950-12-08 1954-02-09 Daimler Benz Ag Dispositif d'injection de carburant, en particulier avec pompe à injection et ajutage d'injection combinés en un bloc unitaire
US3498229A (en) * 1967-11-01 1970-03-03 Dake Corp Hydraulic pump assembly
US3566702A (en) * 1968-03-01 1971-03-02 Bryce Berger Ltd Liquid fuel injection pumps
AT381148B (de) * 1980-12-18 1986-08-25 Friedmann & Maier Ag Einspritzeinrichtung fuer einspritzbrennkraftmaschinen
DE3501287A1 (de) * 1984-01-18 1985-07-25 Friedmann & Maier AG, Hallein, Salzburg Einspritzpumpe fuer einspritzbrennkraftmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103267012A (zh) * 2013-05-29 2013-08-28 宁波合力机泵有限公司 一种改变柱塞容积的流量调节装置
CN103267012B (zh) * 2013-05-29 2015-10-07 宁波合力机泵有限公司 一种改变柱塞容积的流量调节装置

Also Published As

Publication number Publication date
CH672005A5 (fr) 1989-10-13
NO168725B (no) 1991-12-16
FI880655A (fi) 1988-10-31
EP0288669A1 (fr) 1988-11-02
FI880655A0 (fi) 1988-02-12
DE3862056D1 (de) 1991-04-25
NO168725C (no) 1992-03-25
NO881890L (no) 1988-10-31
NO881890D0 (no) 1988-04-29
ES2022482B3 (es) 1991-12-01
JPS63272959A (ja) 1988-11-10
DK164827C (da) 1993-01-11
DK134188D0 (da) 1988-03-11
DK134188A (da) 1988-10-31
FI96535B (fi) 1996-03-29
DK164827B (da) 1992-08-24
FI96535C (fi) 1996-07-10

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