EP0159414B1 - Injecteur de pompe pour l'injection du combustible dans des moteurs à combustion interne - Google Patents

Injecteur de pompe pour l'injection du combustible dans des moteurs à combustion interne Download PDF

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Publication number
EP0159414B1
EP0159414B1 EP84116231A EP84116231A EP0159414B1 EP 0159414 B1 EP0159414 B1 EP 0159414B1 EP 84116231 A EP84116231 A EP 84116231A EP 84116231 A EP84116231 A EP 84116231A EP 0159414 B1 EP0159414 B1 EP 0159414B1
Authority
EP
European Patent Office
Prior art keywords
pump
flange
fastening
guide bush
nozzle assembly
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
Application number
EP84116231A
Other languages
German (de)
English (en)
Other versions
EP0159414A1 (fr
Inventor
Jean Leblanc
Jean Pigeroulet
François Rossignol
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to AT84116231T priority Critical patent/ATE27340T1/de
Publication of EP0159414A1 publication Critical patent/EP0159414A1/fr
Application granted granted Critical
Publication of EP0159414B1 publication Critical patent/EP0159414B1/fr
Expired 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention is based on a pump nozzle according to the generic preamble of the main claim.
  • a pump nozzle of this type is already known (US-A-2 144 862), in which the piston injection pump and the injection nozzle are combined in a common pump housing to form a unit which is attached to the cylinder head of the internal combustion engine.
  • the pump piston which can be actuated against the force of a tappet spring by the engine camshaft via a drive tappet and is provided with at least one oblique control edge, is for the purpose of changing the effective delivery stroke or the delivery rate by means of a coaxial arrangement that allows a stroke movement of the pump piston, but in the direction of rotation entraining regulating sleeve and a control rod which acts on this sleeve and is designed as a delivery quantity adjusting member.
  • the regulating sleeve is inserted into a recess recessed into the pump housing from an end face on the drive side and is fixed in its axial position by a guide bushing or by a disk fastened by this bushing.
  • the drive tappet is received and guided in a sleeve-shaped guide part of the guide bush.
  • the guide bush is fastened in the pump housing by means of a threaded flange which is enlarged in diameter compared to the rest of the guide part and which is screwed into an internal thread in an extension of the recess in the pump housing.
  • This threaded fastening results in a correspondingly large overall length of the entire pump nozzle due to the thread length required for strength reasons and the given overall length of the tappet spring, and the threaded connection of the screwed components cannot avoid axial misalignments between the drive tappet and the pump piston.
  • the guide bush can only be removed after removing the plunger spring.
  • the aim of the invention is to improve the drive assembly consisting of guide bush, plunger spring and drive plunger and possibly also coupled to the pump piston with respect to good assembly on the pump housing, so that the regulating sleeve can be easily removed and installed and is also quickly and easily accessible is.
  • the delivery rate is to be controlled on the pump nozzle by means of a handlebar regulation, and the associated regulating sleeve should be able to be fixed in a swivel position provided on the test bench for attachment to the internal combustion engine without additional attachment means.
  • the guide bush remains connected to the pump housing carrying the other components of the pump nozzle by the holding means even when the fixing screws of the pump nozzle are removed. If the regulating sleeve has to be removed or inspected, the entire assembly can be removed after removing the holding means, without additional disassembly and assembly costs being incurred on this assembly. Due to the guide bushing which can be rotated in the limited area, it can be preset such that the lateral boundary edges of the annular segment-like recess define the maximum pivoting range of the handlebar arm in at least one pivoting direction. This eliminates the need for additional slings.
  • each pump nozzle can be attached to the internal combustion engine housing with a handlebar arm resting on one boundary edge and connected to the regulating linkage in such a way that no further operations for equalizing or adjusting the fuel delivery quantity can be made Internal combustion engine are more necessary.
  • the drive assembly consisting of guide bush, drive plunger and plunger spring remains connected to the pump housing carrying the other components of the pump nozzle even with removed fastening screws of the pump nozzle as well as with removed drive parts or with the pump nozzle removed.
  • the clamping claw fastening of the pump nozzle according to the invention designed according to claims 4 or 5 simultaneously secures the retaining screws of the guide bush and holds the pump nozzle in its installed position on the internal combustion engine housing, wherein according to the characterizing features of claim 5 no additional means for fixing the pump housing in the rotational position are necessary.
  • the holding means can be designed to be relatively weak, since it only has to prevent the components from falling apart, because the forces occurring during operation are caused by the flange of the guide bush and the mounting flange of the pump housing with the internal combustion engine housing fasteners such. B. clamping screws or claws applied or added.
  • EP-A-0 132 798 in its part based on the priority of March 28, 1984 (FIGS. 7 to 9), likewise deals with a pump nozzle which has a handlebar arm and a recess in the flange area of the guide bush. There, however, the design of the spring abutment is specified in claim 1.
  • FIGS. 1, 2 and 3 show the first exemplary embodiment, FIG. 1 as a longitudinal section along the line II in FIG. 2, FIG. 2 as a plan view cut in the region of the handlebar arm and FIG. 3 as a partially sectioned side view (FIG. III in FIG. 2) with the a steering nozzle equipped pump nozzle are shown, and FIG. 4 shows a partial longitudinal section along the line IV-IV in FIG. 5, which shows the essential features of the second exemplary embodiment, and FIG. 5 shows a top view partially cut at the line V in FIG.
  • the pump housing designated 11 receives a piston injection pump 12 and additionally carries an injection nozzle 15 of known and therefore not shown type attached at the end face by means of a screw sleeve 13 with the interposition of a pressure valve 14.
  • a pump piston 17 provided with an oblique control edge 16 is guided within the pump housing 11 in a cylinder bore 18 and is driven in a manner known per se via drive means (not shown) driven by the engine camshaft via a drive plunger 19 against the force of a plunger spring 21 in order to achieve a pump stroke in it Operated in the longitudinal direction.
  • the pump piston 17 can be rotated by means of a regulating sleeve 23 arranged caoxically to it and by means of a control means 27 acting on the regulating sleeve 23.
  • the regulating sleeve 23 is provided with a link arm 23b projecting radially from an annular flange 23a, which bears a driving pin 26 and, as part of the link control 27, with the interposition of an actuating strap 56 and an actuating lever 58, which is adjustably fastened on a rotary shaft 57, for adjusting the delivery rate and the like rotation of the pump piston 17 is pivotable.
  • the rotary shaft 57 with the actuating lever 58 form the delivery quantity adjusting element 24.
  • the pump housing 11 is provided with a recess 29, which is countersunk from an end face 28 on the drive side and is arranged coaxially to the pump piston 17 and serves to receive the regulating sleeve 23 or its annular flange 23a surrounds an axially projecting guide neck 30a of a pump cylinder 30 which serves to guide the pump piston 17 and the regulating sleeve 23.
  • the fastening means 33 are formed by a clamping claw fastening, which is explained in more detail below.
  • a flange 34a of a guide bush 34 is clamped against the end face 28 on the fastening flange 31 when the pump nozzle 10 is attached to the internal combustion engine housing 32.
  • the flange 34a which projects radially beyond the outer diameter d of the plunger spring 21, extends into the region of the end face 28, designated 28a, on which the fastening means 33 of the pump nozzle 10 engage.
  • the guide bushing 34 which is provided with a sleeve-shaped guide part 34b for the drive tappet 19 and at the end an axial position securing for the ring flange 23a and thus for the regulating sleeve 23, is fastened to the fastening flange 31 of the pump housing 11 by two additional retaining screws 35 serving as holding means .
  • This attachment does not have to transmit large forces since it merely represents a transport lock, because the forces occurring during operation are absorbed by the attachment means 33.
  • the end face of the flange 34a, designated 34c is held in contact with the end face 28 of the pump housing 11.
  • the entire drive assembly, designated 38 and consisting of the drive plunger 19, the plunger spring 21 and the guide bush 34 and the coupled pump piston 17, can be removed as a unit held together by a captive device 39.
  • the captive device 39 is formed by a ball 43 inserted into an annular groove 41 in the guide part 34b of the guide sleeve 34 and additionally guided in a longitudinal groove 42 in the drive plunger 19.
  • the guide bushing 34 is provided with an annular extension 34d (FIG. 4) protruding from the end face 34c of its flange 34a (FIG. 4) into the recess 29 of the Pump housing 11 used.
  • An end-side recess 34e within this extension 34d and the recess 29 in the pump housing 11 form a chamber which surrounds or surrounds the radially projecting ring flange 23a of the regulating sleeve 23 on three sides and thus guides the regulating sleeve 23 in the axial direction.
  • the clamping claw fastening already mentioned as fastening means 33 of the pump nozzle 10 and at least partially encompassing the drive assembly 38 consists of a fastening screw 52 and a clamping claw 54 tensioned by this screw on the one hand against an abutment 53 on the internal combustion engine housing 32 and on the other hand against the retaining screws 35 of the guide bushing 34 the two legs of a fork-shaped end 54a of the clamping claw 54 in a semicircle around the guide part 34b of the guide bush 34 and press on heads 35a of the retaining screws 35.
  • a shaft 52a of the fastening screw 52 is inserted through a recess 31a in the fastening flange 31 of the pump housing 11 which serves to fix the rotational position of the pump housing 11. This eliminates the need for additional means to secure the rotational position of the pump nozzle 10 on the internal combustion engine.
  • the two retaining screws 35 which serve only as a transport lock for the drive assembly 38 because of the same fastening force of the clamping claw 54, are screwed through an elongated hole 36 in the flange 34a of the guide bushing 34 into the fastening flange 31 of the pump housing 11.
  • the elongated holes 36 are shaped such that the guide bush 34 can be rotated in a limited area.
  • an annular segment-like recess 59 which allows the passage of the link arm 23b, is recessed, the lateral boundary edges 59a, 59b of which limit the maximum pivoting range of the link arm 23b in at least one pivoting direction. This pivoting direction is identified in FIG.
  • the link arm 23b rests against the one boundary edge 59a, in which it defines and limits the maximum delivery quantity of the pump piston 17.
  • the boundary edge 59a thus serves as a full load or starting quantity stop.
  • the pump nozzle 10 is placed on a test bench, on which it is fixed with respect to its rotational position, as on the internal combustion engine, by means of a fastening screw which engages in the recess 31a and fixes the pump housing 11 in its rotational position or by means of a fixing pin.
  • the guide bushing 34 is rotated counterclockwise until the elongated hole 36 abuts the retaining screw 35. Then the delivery rate is adjusted and the handlebar 23b is held. The flange 34a of the guide bush 34 is then rotated clockwise until the boundary edge 59a abuts the handlebar arm 23b. Now the retaining screws 35 are tightened and the set position is thus fixed.
  • the handlebar control 27 is then adjusted by appropriately mounting the actuating lever 58 with the handlebar arm 23b resting on the boundary edge 59a and with the pump housing 11 fixed in rotational position relative to the internal combustion engine housing 32 by means of the recess 31a. In this way, all pump nozzles 11 of the same internal combustion engine can be coupled to the rotary shaft 57 of the delivery quantity adjusting element 24 without any further adjustment and setting processes.
  • the second exemplary embodiment described below and shown in FIGS. 4 and 5 differs from the first exemplary embodiment only in terms of the holding means for the guide bushing and additionally by different fastening means.
  • the same parts are therefore the same, different parts with an index line and new parts are newly labeled.
  • the holding means for the guide bush 34 ′ is formed by two threaded sleeves 46. and although clamping claws can also be used as fastening means, two fastening bolts 47 consisting of stud bolts and nuts are used in this example, of which only one is shown for the sake of clarity.
  • the drive assembly 19, designated by 38 'and consisting of the drive plunger 19, the plunger spring 21 and the guide bushing 34', can be removed from the pump nozzle 10 'as a unit held together by the captive lock 39 if the fastening screws are loosened or removed 47, the threaded sleeves 46 serving as holding means are also unscrewed.

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

Claims (7)

1.- Injecteur de pompe pour l'injection de carburant dans des moteurs à combustion interne, injecteur comportant:
- un boîtier de pompe (11) renfermant une pompe d'injection à piston (12) et portant une buse d'injection (15),
- un piston de pompe (17) susceptible d'être actionné par l'intermédiaire d'un poussoir d'entraînement (19) contre l'action d'un ressort de poussoir (21) et guidé à l'intérieur du boîtier (11) de la pompe dans un alésage cylindrique (18), ce piston étant susceptible de tourner au moyen d'un manchon de régulation (23) disposé coaxialement par rapport à lui pour permettre de modifier la course de refoulement utile,
- une douille de guidage (34) fixée sur le boîtier (11) de la pompe, munie d'une partie de guidage en forme de manchon (34b) pour le poussoir d'entraînement (19), et constituant frontalement un blocage axial en position pour le manchon de régulation (23), et comportant une face frontale côté entraînement (28) contre le boîtier (11) de la pompe,
- une bride de fixation (31) placée sur le boîtier (11) de la pompe, et sur laquelle viennent en prise, tout au moins indirectement, des moyens de fixation (33) pour permettre de fixer l'injecteur de pompe (10) sur le moteur à combustion interne,

injecteur de pompe caractérisé en ce que:
a) la douille de guidage (34, 34') est munie d'une bride (34a, 34a') faisant saillie radialement au-delà du diamètre externe (d) du ressort de poussoir (21), bride dont la face frontale (34c) s'applique contre la face frontale côté entraînement (28, 28') du boîtier (11, 11') de la pompe et s'étend sur la zone (28a) de cette face frontale (28, 28') sur laquelle viennent en prise les moyens de fixation (33, 47) de l'injecteur de pompe (10, 10').
b) la bride (34a, 34a') de la douille de guidage (34, 34') est fixée sur le boîtier (11, 11') de la pompe par un moyen de maintien (35, 46),
c) le moyen de maintien (35, 46) pour la douille de guidage (34, 34') est fixé à travers une boutonnière (36, 36') dans la bride (34a, 34a') de la douille de guidage (34, 34') sur la bride de fixation (31, 31') du boîtier (11, 11') de la pompe,
d) le manchon de régulation (23) est muni d'un bras oscillant (23b) faisant saillie radialement, faisant partie d'une régulation à bras oscillant (27),
e) dans la zone de la collerette de la douille de guidage (34, 34') susceptible de tourner dans une étendue limitée par la boutonnière (36, 36') et susceptible d'être fixée par le moyen de maintien (35, 46), est ménagé un évidement en forme de segment circulaire (59) permettant le passage du bras oscillant (23b) et dont les arêtes latérales de délimitation (59a, 59b) délimitent l'étendue maximale de pivotement du bras oscillant (23b) au moins dans un sens de pivotement (R).
2.- Injecteur de pompe selon la revendication 1, caractérisé en ce que, grâce à la douille de guidage (34, 34') susceptible de tourner dans une étendue limitée, l'une (59a) des arêtes de délimitation limitant dans l'un (R) de ses sens de déplacement, la zone de pivotement du bras oscillant (23b) est susceptible d'être réglée dans une position dans laquelle, lorsque le bras oscillant (23b) s'applique contre cette arête de délimitation (59a), le piston de pompe (17) ou bien chacun des pistons de pompe des injecteurs de pompes montés sur le même moteur à combustion interne, ou bien chaque piston de pompe des injecteurs de pompes réalisés avec le même réglage, occupe une position en rotation prédéterminée, associée à une quantité déterminée de refoulement de carburant.
3.- Injecteur de pompe selon la revendication 1 ou 2, caractérisé en ce que la partie de guidage (34b) de la douille de guidage (34, 34') et le poussoir d'entraînement (19) sont équipés d'une sécurité (39) grâce à laquelle au moins la douille de guidage (34, 34'), le poussoir d'entraînement (19), et le ressort de poussoir (21) sont réunis en un groupe d'entraînement (38, 38') qui est maintenu rassemblé, même lorsqu'il est démonté.
4.- Injecteur de pompe selon une des revendications 1 à 3, caractérisé en ce que, comme moyens de fixation (33) de l'injecteur de pompe (10), on utilise une fixation par pinces de serrage entourant au moins partiellement le groupe d'entraînement (36) et qui est constituée d'une griffe de serrage (54) bridée contre la vis de maintien ou les vis de maintien (35) de la douille de guidage (34) par une vis de fixation (52).
5.- Injecteur de pompe selon la revendication 4, caractérisé en ce qu'un fût (52a) de la vis de fixation (52) du moyen de fixation (33) est enfilé à travers un ajour (31 a), servant à fixer la position en rotation du boîtier (11) de la pompe, dans la bride de fixation (31) de ce boîtier (11) de la pompe.
6.- Injecteur de pompe selon une des revendications 1 à 5, caractérisé en ce que, comme moyen de maintien, on utilise au moins une vis de maintien (35) reliant, indépendamment des moyens de fixation (33) de l'injecteur de pompe (10), la bride (34a) de la douille de guidage (34) à la bride de fixation (31) sur le boîtier de la pompe, cette vis de maintien étant vissée à travers la boutonnière (36) dans la bride (34a) de la douille de guidage (34), dans la bride de fixation (31) du boîtier (11) de la pompe.
7.- Injecteur de pompe selon une des revendications 1 à 5, caractérisé en ce que, comme moyens de fixations de l'injecteur de pompe (10'), on utilise au moins deux fixations par vis (47) passant à travers les boutonnières (36') dans la bride (34a') de la douille de guidage (34') et les perçages (37) dans la bride de fixation (31'), et qu'on utilise, comme moyens de maintien, au moins un manchon fileté (46) muni d'un bandeau radial (46a), qui est vissé coaxialement par rapport à la fixation par vis (47) et à travers la boutonnière correspondante (36') dans la bride (34a') de la douille de guidage (34') dans une partie filetée (37a) du perçage associé (37) de la bride de fixation (31'), et qui maintient fermement par son bandeau (46a) la bride (34a') de la douille de guidage (34') contre la bride de fixation (31') du boîtier (11') de la pompe.
EP84116231A 1984-03-28 1984-12-22 Injecteur de pompe pour l'injection du combustible dans des moteurs à combustion interne Expired EP0159414B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84116231T ATE27340T1 (de) 1984-03-28 1984-12-22 Pumpduese fuer die kraftstoffeinspritzung bei brennkraftmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3411407 1984-03-28
DE19843411407 DE3411407A1 (de) 1984-03-28 1984-03-28 Pumpduese fuer die kraftstoffeinspritzung bei brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0159414A1 EP0159414A1 (fr) 1985-10-30
EP0159414B1 true EP0159414B1 (fr) 1987-05-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116231A Expired EP0159414B1 (fr) 1984-03-28 1984-12-22 Injecteur de pompe pour l'injection du combustible dans des moteurs à combustion interne

Country Status (5)

Country Link
US (1) US4571161A (fr)
EP (1) EP0159414B1 (fr)
JP (1) JPS60219452A (fr)
AT (1) ATE27340T1 (fr)
DE (2) DE3411407A1 (fr)

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DE3463823D1 (en) 1987-06-25
DE3411407A1 (de) 1985-10-03
JPS60219452A (ja) 1985-11-02
ATE27340T1 (de) 1987-06-15
EP0159414A1 (fr) 1985-10-30
US4571161A (en) 1986-02-18

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