EP0461212B1 - Pompe d'injection de carburant a commande electrique pour moteurs a combustion interne, en particulier pompe d'injection combinee avec l'injecteur - Google Patents

Pompe d'injection de carburant a commande electrique pour moteurs a combustion interne, en particulier pompe d'injection combinee avec l'injecteur Download PDF

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Publication number
EP0461212B1
EP0461212B1 EP90916705A EP90916705A EP0461212B1 EP 0461212 B1 EP0461212 B1 EP 0461212B1 EP 90916705 A EP90916705 A EP 90916705A EP 90916705 A EP90916705 A EP 90916705A EP 0461212 B1 EP0461212 B1 EP 0461212B1
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EP
European Patent Office
Prior art keywords
pump
housing part
control valve
fuel injection
annular groove
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
EP90916705A
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German (de)
English (en)
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EP0461212A1 (fr
Inventor
Werner Pape
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
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0461212A1 publication Critical patent/EP0461212A1/fr
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Publication of EP0461212B1 publication Critical patent/EP0461212B1/fr
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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing

Definitions

  • the invention relates to an electrically controlled fuel injection pump for internal combustion engines, in particular pump nozzle, according to the preamble of claim 1.
  • a pump piston preferably driven by the camshaft of the engine, is arranged in a common housing together with an associated injection nozzle.
  • the fuel injection quantity is controlled during the pressure stroke of the pump piston by a quantity control valve which, for reasons of space, is attached to a laterally projecting housing part.
  • a feed pump delivers fuel from a reservoir into a low-pressure chamber, which is connected to the pump working chamber via a metering line.
  • fuel of low pressure flows through the metering line into the pump work space and during the pressure stroke, as long as this metering line is open, back into the low pressure room.
  • the quantity control valve is arranged in this metering line, so that the pressure required for the injection can build up in the pump work space in the blocked state.
  • the fuel injection pump according to the invention with the characterizing features of the main claim has the advantage that no thread has to be attached to the pump housing in order to connect the quantity control valve to the pump housing in a high-pressure-tight manner, and that the high-pressure section of the metering line connects the straight-line high-pressure bore as the pump work space with the quantity control valve is executable.
  • the pump housing instead of an external thread that is difficult to manufacture, the pump housing only has to be provided with lateral recesses into which the fastening sleeve provided with an internal thread engages in a fork-like manner for the high-pressure-tight fastening of the quantity control valve on the pump housing.
  • the fastening sleeve is on the side facing away from the pump piston the projecting housing part is pushed on, so that the side facing the pump piston of the projecting housing part is not covered by the fastening sleeve and its design is only subject to the requirements of the pressure channel guide to the pump work space.
  • the lateral recesses are formed by two transverse grooves running perpendicular to the stroke direction of the pump piston.
  • the fastening sleeve has a corresponding inner collar on its fork-like part and is simply pushed onto the projecting housing part from the side facing away from the pump piston. By tightening the screw sleeve, the volume control valve is pressed against a sealing surface provided on the projecting housing part and at the same time the fastening sleeve is locked.
  • the two transverse grooves are guided from the side of the projecting housing part facing away from the pump piston in the direction of the pump piston and a semi-annular groove connecting the two transverse grooves is provided on the side of the projecting housing part facing away from the pump piston.
  • the lateral recesses are formed by at least three blind holes arranged uniformly in a plane perpendicular to the longitudinal axis of the pump piston, in each of which a ball is mounted, which on the other hand protrude into a partial annular groove provided on the inner wall of the fastening sleeve, wherein in the wall of the fastening sleeve, the blind holes are provided with recesses through which the balls can be removed when the fastening sleeve is loose.
  • a high-pressure-tight attachment of the quantity control valve to the pump housing is ensured without the attachment sleeve having to have an inner collar. This results in a smaller outer diameter of this pump part.
  • the lateral recesses are formed by a first partial annular groove provided in the projecting housing part and by a second partial annular groove parallel to the first partial ring groove in the projecting housing part and these partially overlapping partial annular groove on their side facing the sealing surface, into which a snap ring engages, which, on the other hand, projects into a partial ring groove provided in the wall of the fastening sleeve, the cross section of the first partial ring groove corresponding to the cross section of the snap ring.
  • This pump part also has a smaller outer diameter here, the assembly being simplified compared to the aforementioned embodiment.
  • the projecting housing part on its side facing the pump piston has a section tapering obliquely in the direction of the pump piston, the metering line running through this oblique section starting from the quantity control valve going straight to the pump piston and subsequently up to once in the direction the pump work area is cranked.
  • this has the advantage that fluidically unfavorable offsets are avoided.
  • there is no need for high-pressure seals to the outside area since all holes for high-pressure lines can be drilled from surfaces that are to be sealed with a high-pressure seal anyway.
  • the metering line starting from the quantity control valve, is led directly to the pump work space as a straight, linear high pressure bore.
  • the high-pressure bore between the quantity control valve and the pump work space has no offsets at all, so that no roundings have to be carried out and optimal flow conditions prevail.
  • Another advantage is that no seals are required to seal the high pressure line from the outside.
  • FIG. 1 shows a fuel injection pump with a fastening sleeve for the quantity control valve in a partially sectioned, schematic representation
  • 2 shows a partial view of a variant of this fuel injection pump, likewise in a partially sectioned, schematic: representation
  • Fig. 3 is a section along line III-III in Fig. 1
  • 4 shows a plan view of the underside of a fastening sleeve according to the invention
  • 5 shows a section along line VV in Fig. 4.
  • 6 shows a section along line VI-VI in FIG. 5;
  • FIG. 1 shows a fuel injection pump with a fastening sleeve for the quantity control valve in a partially sectioned, schematic representation
  • 2 shows a partial view of a variant of this fuel injection pump, likewise in a partially sectioned, schematic: representation
  • Fig. 3 is a section along line III-III in Fig. 1
  • 4 shows a plan view of the underside of a fastening s
  • FIG. 7 shows a section through a pump nozzle with a variant of the fastening sleeve, cut along line VII-VII in FIG. 8; 8 shows a section through this fastening sleeve according to line VIII-VIII in Fig. 7.
  • 9 shows a representation corresponding to FIG. 7 of a further variant, cut along line IX-IX in FIG. 10 and FIG. 10 shows a section along line XX in FIG. 9.
  • the pump nozzle 10 according to the invention shown in FIG. 1 has a pump piston 12 which is guided in a pump housing 11 and which, with the interposition of a drive tappet 13, is driven by a drive element (not shown) against the force of a return spring 14.
  • the pump piston 12 delimits with the pump housing 11 a pump working chamber 15, from which a pressure line 16 leads to a pressure chamber 17, in which a valve needle 18 works, which is displaced against the force of a closing spring 19 at a sufficiently high injection pressure and thereby opens spray openings 20, so that the fuel gets into the combustion chamber of the engine.
  • a low-pressure chamber 21 is provided in the pump housing 11 between the pump piston 12 and the valve needle 18 and is supplied with fuel by a feed pump (not shown) via an inflow line 22.
  • the pressure in the low pressure chamber 21 is determined by a pressure relief valve 23 which is inserted into a return line 24.
  • the pump working chamber 15 is supplied with fuel from the low-pressure chamber 21 via a metering line 25, in which a quantity control valve 26 is inserted.
  • the quantity control valve 26 is arranged on a projecting housing part 27 of the pump housing 11 and on this by means of a fastening sleeve 28 which is fork-like in the housing part 27 provided transverse grooves 29 engages, attached high pressure tight.
  • the fastening sleeve 28 is provided with an internal thread 30, into which a screw sleeve 32 provided with an external thread 31 is screwed.
  • the screw sleeve 32 engages against an outer collar 33 provided on the quantity control valve 26, as a result of which the quantity control valve 26 is pressed against a sealing surface 34 provided on the projecting housing part 27.
  • the projecting housing part 27 is provided with a half-ring groove 35 connecting the transverse grooves 29, into which the fastening sleeve 28 also engages.
  • the metering line 25 runs continuously between the quantity control valve 26 and the pump work chamber 15.
  • the projecting housing part 27 has, on its side facing the pump piston 12, a section 27a which is formed obliquely towards it, around a metering line 25, which is cranked once or not at all, between the quantity control valve 26 and pump work space 15 to enable.
  • the fork-like support of the fastening sleeve 28 on the projecting housing part 27 can be seen from FIG. 3.
  • the fastening sleeve 28 itself is shown in FIGS. 4, 5 and 6. It has an annular region 36 provided with the internal thread 30, which is adjoined by a semi-annular region 37 without an internal thread.
  • the half-ring-shaped region 37 is provided on its side facing away from the annular region 36 with a circumferential inner collar 38 with which the fastening sleeve 28 is supported in the recesses 29 and 35 of the housing part 27.
  • the fastening sleeve 28 is first inserted into the recesses 29 and 35 in a fork-like manner, then the quantity control valve 26, the outer diameter of which is smaller than the free inner diameter of the fastening sleeve 28, is placed on the sealing surface 34 of the housing part 27 and finally the screw sleeve 32 is placed over the quantity control valve 26 and screwed into the internal thread 31 of the fastening sleeve 28.
  • the quantity control valve 26 is thereby pressed against the sealing surface 34 of the housing part 27 in a high pressure-tight manner, the recesses 29 and 35 serving as a bearing for the fastening sleeve 28.
  • FIGS. 7 and 8 Another type of anchoring of the fastening sleeve 128 to the projecting housing part 127 is shown in FIGS. 7 and 8.
  • the lateral recesses in the projecting housing part 127 are designed in the form of conical blind holes 39, in each of which a ball 40 is mounted. These balls 40 and the associated blind holes 39 are arranged laterally on the projecting housing part 127 in a plane perpendicular to the stroke direction of the pump piston 12.
  • the balls 40 which are immersed up to about half their diameter in the tapered blind holes 39, on the other hand, extend into a partial annular groove 41 provided in the wall of the fastening sleeve 128, which in the part-annular region 42 of the fastening sleeve 128 encompassing the projecting housing part 127 also in a direction of stroke of the pump piston 12 vertical plane runs.
  • three recesses 43 are provided in a plane parallel to the part-ring groove 41 and somewhat offset from the ring-shaped area 136 of the fastening sleeve 128, which are arranged in this plane so that they lie opposite the balls 40.
  • the projecting housing part 127 Parallel to the sealing surface 34, the projecting housing part 127 has a shoulder 44 on which the fastening sleeve 128 is seated when the screw sleeve 32 is loosened. The distance of this shoulder 44 from the sealing surface 34 is chosen so that when seated Fastening sleeve 128, the recesses 43 are aligned with the associated balls 40.
  • the mounting sleeve 128 is slipped over the projecting housing part 127 and is seated on the shoulder 44 thereof for mounting the volume control valve 26.
  • the recesses 43 in the wall of the fastening sleeve 128 are aligned in this position with the tapered blind holes 39, so that the balls 40 can be inserted.
  • the screw sleeve 32 is placed over the quantity control valve 26 and screwed into the fastening sleeve 128.
  • the quantity control valve 26 is pressed against the sealing surface 34, the fastening sleeve 128 being anchored by the balls 40, which are supported on the one hand in the conical blind holes 39 and on the other hand in the partial ring groove 41. In this position, the recesses 43 are no longer aligned with the blind holes 39, so that the balls 40 cannot fall out.
  • FIGS. 9 and 10 Another variant of anchoring the fastening sleeve 228 to the projecting housing part 227 is shown in FIGS. 9 and 10.
  • a first partial annular groove 45 parallel to the sealing surface 34 is provided as the lateral recess on the projecting housing part 227, and a second partial annular groove 46, which also parallel to the first partial annular groove 45 and is also parallel to it, the cross section of which is, however, smaller by half than that Cross-section of the first partial annular groove 45, and which is arranged offset to the first partial annular groove 45 somewhat in the direction of the sealing surface 34.
  • a partial annular groove 48 is also provided on the inner wall of the partially annular region 47 of the fastening sleeve 228, the cross section of which corresponds to the cross section of the second partial annular groove 46.
  • the cross-section of the first part-ring groove 45 corresponds to the cross-section of a snap ring 49, which is preloaded radially outwards and is supported in the assembled state on the one hand in the second part-ring groove 46 provided in the projecting housing part 227 and on the other hand in the part-ring groove 48 provided in the fastening sleeve 228.
  • the fastening sleeve 228 is supported on a shoulder 50 provided on the projecting housing part 227 parallel to the sealing surface 34, the distance to the sealing surface 34 is dimensioned such that the partial annular groove 48 provided in the wall of the fastening sleeve 228 is in this position is aligned with the first partial annular groove 45 in the projecting housing part 227.

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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)

Abstract

Pompe d'injection de carburant à commande électrique pour moteurs à combustion interne, en particulier pompe d'injection combinée avec l'injecteur, comportant un piston de pompe (12) disposé et guidé dans un corps de pompe (11). Le piston de pompe (12) délimite un espace de travail (15) de la pompe et refoule, en course de refoulement, le carburant amené par une pompe d'alimentation à cet espace de travail (15) vers un injecteur tant qu'une électrovanne (26) régulatrice de débit bloque le passage du carburant qui autrement s'écoule de l'espace de travail (15) de la pompe vers une chambre basse pression (21) en passant par une conduite de dosage (25), avec une partie de corps (27) en saillie latérale sur le corps de pompe (11) au niveau du piston de pompe (12) et abritant l'électrovanne régulatrice de débit (26). La conduite de dosage (25), menant à l'espace de travail (15) de la pompe, s'étend jusque dans ladite partie de corps (27) en saillie sur laquelle sont prévus des évidements latéraux (29) dans lesquels s'insère, à la manière d'une fourchette, un manchon de fixation (28) pour la vanne régulatrice de débit (26), lequel est doté d'un filet intérieur (30) et coopère avec une douille filetée (32) dotée d'un filet extérieur (31).

Claims (7)

  1. Pompe d'injection de carburant commandée électriquement pour moteurs à combustion interne, notamment pompe combinée avec l'injecteur, avec un cylindre de pompe disposé dans un boîtier de pompe (11) et un piston de pompe (12) guidé dans ce cylindre, en délimitant une chambre de travail (15) de la pompe, et qui, lors de sa course de refoulement, refoule sous la pression d'injection vers l'injecteur, le carburant envoyé par une pompe de refoulement sous une pression d'alimentation dans cette chambre de travail de la pompe, et ceci tant qu'une soupape de contrôle de la quantité ou de dosage (26) bloque le débit du carburant qui, autrement s'écoule en excès de la chambre de travail de la pompe vers une chambre basse pression (21) par l'intermédiaire d'une canalisation de dosage (25), et avec une partie (27) de boîtier faisant saillie latéralement sur le boîtier de la pompe au niveau du cylindre de la pompe et recevant la soupape de contrôle de la quantité (26), et à l'intérieur de laquelle s'étend la canalisation de dosage allant à la chambre de travail de la pompe, pompe d'injection caractérisée en ce que sur la partie en saillie (27) du boîtier, il est prévu des évidements latéraux dans lesquels un manchon de fixation (28) pour la soupape de contrôle de la quantité (26), manchon muni d'un filetage interne (30) et coopérant avec une douille filetée (32) comportant un filetage externe (31), vient en prise à la façon d'une fourchette.
  2. Pompe d'injection de carburant, selon la revendication 1, caractérisée en ce que les évidements latéraux sont constitués par deux gorges transversales (29) s'étendant perpendiculairement à la direction de la course du piston de pompe (12).
  3. Pompe d'injection de carburant, selon la revendication 2, caractérisée en ce que les deux gorges transversales (29) s'étendent depuis le côté opposé au piston de pompe (12) de la partie en saillie (27) du boîtier en direction du piston de pompe (12), et en ce que sur le côté opposé au piston de pompe (12) de la partie en saillie (27) du boîtier, il est prévu une gorge semi circulaire (35) reliant les deux gorges transversales (29).
  4. Pompe d'injection de carburant selon la revendication 1, caractérisée en ce que les évidements latéraux sont constitués par au moins trois trous borgnes (39) répartis uniformément dans un plan perpendiculaire à l'axe longitudinal du piston de pompe (12), trous borgnes dans chacun desquels est placée une bille (40) qui, par ailleurs, fait saillie à l'intérieur d'une gorge annulaire partielle (41) prévue sur la paroi interne du manchon de fixation (128), et en ce que, dans la paroi du manchon de fixation (128) sont prévus des évidements (43) associés aux trous borgnes (39), évidements à travers lesquels les billes (40) peuvent être enlevées lorsque le manchon de fixation (128) est desserré (figures 7 et 8).
  5. Pompe d'injection de carburant selon la revendication 1, caractérisée en ce que les évidements latéraux sont constitués par une première gorge annulaire partielle (45) prévue dans la partie en saillie (227) du boîtier, et par une seconde gorge annulaire partielle (46) parallèle à la première gorge annulaire partielle (45) sur la partie en saillie (227) du boîtier et recoupant partiellement celle-ci sur son côté tourné vers la surface d'étanchéité (34), dans laquelle vient en prise un jonc (49) précontraint radialement vers l'extérieur qui, par ailleurs, fait saillie dans une gorge annulaire partielle (48) prévue dans la paroi du manchon de fixation (228), tandis que la section transversale de la première gorge annulaire partielle (45) correspond à la section transversale du jonc (49) (figures 9 et 10).
  6. Pompe d'injection de carburant selon une des précédentes revendications, caractérisée en ce que la partie en saillie (27) du boîtier comporte sur son côté en regard du piston de pompe (12) un tronçon (27a) s'étendant obliquement en direction du piston de pompe (12) et en ce que la canalisation de dosage (25) s'étendant à travers ce tronçon oblique (27a) et partant de la soupape de contrôle de la quantité (26) va en droite ligne vers le piston de pompe (12) et est ensuite coudée au maximum une fois en direction de la chambre de travail de la pompe (15), (figure 1).
  7. Pompe d'injection de carburant selon la revendication 6, caractérisée en ce que la canalisation de dosage (25) partant de la soupape de contrôle de la quantité (26) va directement à la chambre de travail (15) de la pompe sous la forme d'un perçage rectiligne haute pression (figure 2).
EP90916705A 1990-01-03 1990-11-24 Pompe d'injection de carburant a commande electrique pour moteurs a combustion interne, en particulier pompe d'injection combinee avec l'injecteur Expired - Lifetime EP0461212B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4000044 1990-01-03
DE4000044A DE4000044A1 (de) 1990-01-03 1990-01-03 Elektrisch gesteuerte kraftstoffeinspritzpumpe fuer brennkraftmaschinen, insbesondere pumpeduese

Publications (2)

Publication Number Publication Date
EP0461212A1 EP0461212A1 (fr) 1991-12-18
EP0461212B1 true EP0461212B1 (fr) 1993-08-25

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EP90916705A Expired - Lifetime EP0461212B1 (fr) 1990-01-03 1990-11-24 Pompe d'injection de carburant a commande electrique pour moteurs a combustion interne, en particulier pompe d'injection combinee avec l'injecteur

Country Status (5)

Country Link
US (1) US5402944A (fr)
EP (1) EP0461212B1 (fr)
JP (1) JPH04504894A (fr)
DE (2) DE4000044A1 (fr)
WO (1) WO1991010062A1 (fr)

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Also Published As

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DE4000044A1 (de) 1991-07-04
JPH04504894A (ja) 1992-08-27
WO1991010062A1 (fr) 1991-07-11
US5402944A (en) 1995-04-04
DE59002487D1 (de) 1993-09-30
EP0461212A1 (fr) 1991-12-18

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