EP0205814B1 - Pompe d'injection de combustible - Google Patents

Pompe d'injection de combustible Download PDF

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Publication number
EP0205814B1
EP0205814B1 EP86105601A EP86105601A EP0205814B1 EP 0205814 B1 EP0205814 B1 EP 0205814B1 EP 86105601 A EP86105601 A EP 86105601A EP 86105601 A EP86105601 A EP 86105601A EP 0205814 B1 EP0205814 B1 EP 0205814B1
Authority
EP
European Patent Office
Prior art keywords
pump
fuel injection
plug
bore
injection pump
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
EP86105601A
Other languages
German (de)
English (en)
Other versions
EP0205814A1 (fr
Inventor
Wilfried Ing.(grad.) Böhringer
Franz Eheim
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
Publication of EP0205814A1 publication Critical patent/EP0205814A1/fr
Application granted granted Critical
Publication of EP0205814B1 publication Critical patent/EP0205814B1/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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means
    • 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
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing

Definitions

  • the invention relates to a fuel injection pump according to the preamble of the main claim.
  • a fuel injection pump of this type known from GB-A-2 057 589
  • a pressure valve is arranged above the pump work chamber coaxially with the pump piston, the closing spring of which is arranged within a pot-shaped expansion sleeve which is tensioned on a valve carrier by a cap serving as a screw connection that a seal is created.
  • This known fuel injection pump has a disproportionately large, harmful space.
  • a large harmful space is disadvantageous primarily because the fuel is compressed at the high injection pressures due to its compressibility, and control errors result for the quantity control according to the harmful space.
  • a harmful space can lead to cavitation during suction suction with gas or air pockets, which entails the risk of cavitation and / or errors when starting the spray.
  • the fuel injection pump according to the invention with the characterizing features of the main claim has the advantage that the expansion sleeve is tightly clamped between the part receiving the pump piston and the stopper, whereby the central opening of the stopper is filled by the venting plug so that no harmful space is created here. This is further reduced by the fact that the expansion sleeve fills the space formed between the threaded bushing and the plug.
  • several pressure valves are provided, which are each arranged after the distributor control by the pump piston in front of the pressure lines.
  • the ventilation of the pump work space can advantageously in the embodiment according to the invention. done very simply by unscrewing the vent plug, when screwing it in, the plug, which is advantageously bolt-shaped, plunges directly into the fuel located in the central plug opening after venting.
  • the invention has further advantages in terms of production, since the two-part design allows the axial ring surface, which also serves as a seal, to be machined well before the threaded bushing is soldered in. In this way, the end face of the expansion sleeve is opposite a well machined support surface, as required for the high-pressure seal.
  • the stopper consists in two parts of an external threaded ring and a threaded bushing coaxially soldered into its stepped inner bore, which receives the venting stopper, the expansion sleeve being supported on the axial annular surface formed by the step.
  • This configuration has advantages in terms of manufacturing technology in particular, since the two-part design allows the axial ring surface, which also serves as a seal, to be machined well before the threaded bushing is soldered in. In this way, the end face of the expansion sleeve faces a well-machined support surface, as required for the high-pressure seal.
  • the distance from the pump piston to the internal thread of the threaded bushing is smaller than the ring surface according to a further embodiment of the invention.
  • the contact area between the external threaded ring and the threaded bushing used for the soldering can be relatively small for sufficient durability and tightness.
  • the outwardly facing end face of the threaded bushing can advantageously serve as an axial sealing face of an annular seal clamped in by the head of the vent plug. This sealing surface can also be machined here before the two parts are soldered.
  • the front ends of the expansion sleeve have at least one bevel forming a cutting edge, in order to thereby achieve the highest possible Hertzian pressures at the sealing points and thus a better seal.
  • This seal can be improved by choosing different materials and / or different remuneration.
  • FIG. 1 shows a partial longitudinal section through a distributor injection pump
  • FIG. 2 shows a section from FIG. 1 on an enlarged scale.
  • a cylinder liner 2 is arranged, in the inner bore 3 of which a pump and distributor piston 4 operates.
  • the pump and distributor piston 4 is set in a reciprocating and at the same time rotating movement by a cam drive 5, for which purpose a cam disk 6 which is connected to the pump piston in a rotationally locking manner and which runs on rollers 7 of a roller ring 8 is used.
  • the rotary motion is generated by a drive shaft 9 which is also mounted in the pump housing 1 and which is coupled to the pump and distributor piston 4 via a dog clutch 10.
  • a control slide 11 On the shaft of the pump and distributor piston 4, a control slide 11 is arranged axially displaceable, the axial position of which is determined by a control lever 12 of a speed controller, not shown.
  • a relief channel 12 of a pump work chamber 13 is opened sooner or later, depending on the axial position of the control slide 11, so that the fuel quantity dependent on the axial position of the control slide 11 and delivered to the opening of the relief channel 12 is injected.
  • the pump working space 13 is delimited by the end face 17 of the pumping and distributing piston 4, by the wall of the bore 3 of the bushing 2 and by a screw connection 18, which is shown on an enlarged scale in FIG. 2.
  • the suction channel 20 is additionally controlled by a solenoid valve 21.
  • the injection pump shown works as follows: During the suction stroke of the pump and distributor piston 4 caused by the cam drive 5, fuel is conveyed through the suction channel 20 from the interior of the housing serving as suction chamber 22 via a longitudinal groove 19 into the pump working chamber 13. The suction chamber 22 is under a slight positive pressure for this. As soon as the movement of the pump and distributor piston 4 is then reversed, fuel is pumped from the pump working space 13 via the central bore 14 to the distributor bore 15 and from there via one of the pressure channels 16 to the internal combustion engine. As soon as the relief channel 12 is opened by the control slide 11 after covering a certain stroke, this is under. High-pressure delivery to the internal combustion engine is interrupted by the fuel still located in the pump work chamber 13 flowing back into the suction chamber 22 under low pressure. Shutting off the pump can he f gen ol by closing the suction passage 20 by means of the solenoid valve 21st The conveyed to the internal combustion engine amount is changed via the speed controller by the control slide is moved. 11
  • the closure screw connection 18 consists of a stopper 23 which consists of two parts, namely an external threaded ring 24 and a threaded bush 25 soldered into it.
  • a vent plug 26 is screwed into the threaded bushing 25, which takes up almost the entire inner bore of the threaded bushing 25 and presses with its head 27 an annular seal 28 onto the outwardly facing end face of the threaded bushing 25.
  • the threaded bushing 25 has a step 29 with which it abuts a step 30 of the inner bore of the ring 24.
  • This ring surface 30 also serves as a support for an expansion sleeve 31, which is supported on the other hand on the cylinder liner 2.
  • the cylinder liner 2 is in turn secured by a ring 32, which is supported on the housing 1, against axial displacement in the direction of the pump piston drive.
  • a seal 33 is also arranged between the outer threaded ring 24 and the housing 1.
  • the pump working space is metallically sealed from the outside by this screw connection 18, by the expansion sleeve 31 being connected to the cylinder bushing 2 and the soldered-in threaded bushing 25 being connected to this inwards.
  • the vent plug 26 also delimits the pump work space 13 with its lower end face 34. In order to achieve high Hertzian pressures on the end sealing surfaces of the expansion sleeve 31, these end faces are each chamfered to form a cutting edge.
  • the vent plug 26 is unscrewed from the threaded bush 25, so that the space that is freed up can be filled with fuel. Thereafter, the bolt-shaped plug 26 is immersed in this fuel and screwed into the threaded bushing 25, so that no air or gases remain in the pump work space 13.
  • the thread overlap is longer than the partially soldered contact section between the external threaded ring 24 and the threaded bushing 25.

Landscapes

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

Claims (4)

1. Pompe d'injection de combustible pour moteurs à combustion interne avec au moins une chambre de travail de pompe (13), qui est délimitée par la face frontale d'un piston de pompe (4), la paroi interne d'un alésage (3) dans lequel est logé le piston de pompe, et un bouchon (23) susceptible d'être vissé par un filetage externe dans un alésage fileté du boîtier de pompe, et le fermant vers l'extérieur, bouchon dans lequel peut être vissé co-axialement un bouchon désaérateur (26, 27) et qui comporte un perçage interne muni d'un épaulement (30) contre lequel vient s'appliquer une douille d'extension (31), qui est serrée par le bouchon de la chambre de travail (13) de la pompe, frontalement de façon étanche sur la partie (2) comportant l'alésage (3), pompe d'injection caractérisée en ce que, dans la partie se raccordant vers l'intérieur à l'épaulement, du perçage interne du bouchon, est brasée co-axialement une douille filetée (25) dans laquelle est logé le bouchon désaérateur, la douille d'extension (31) entourant la douille filetée (25) et le bouchon désaérateur (26) remplissant le perçage interne de la douille filetée.
2. Pompe d'injection de combustible selon la revendication 1, caractérisée en ce que la distance entre la partie (2) guidant le piston et le filetage interne de la douille filetée (25) est inférieure à la distance entre la partie (2) et la surface annulaire de l'épaulement (30) du perçage interne.
3. Pompe d'injection de combustible selon la revendication 1 ou 2, caractérisée en ce que la face frontale orientée vers l'extérieur de la douille filetée (25) joue le rôle d'appui axial d'un joint annulaire d'étanchéité (28) serré par une tête (27) du bouchon désaérateur (26).
4. Pompe d'injection de combustible selon une des précédentes revendications, caractérisée en ce que les extrémités frontales de la douille d'extension (31) comportent au moins un chanfrein formant un tranchant.
EP86105601A 1985-05-15 1986-04-23 Pompe d'injection de combustible Expired EP0205814B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853517521 DE3517521A1 (de) 1985-05-15 1985-05-15 Kraftstoffeinspritzpumpe
DE3517521 1985-05-15

Publications (2)

Publication Number Publication Date
EP0205814A1 EP0205814A1 (fr) 1986-12-30
EP0205814B1 true EP0205814B1 (fr) 1988-09-28

Family

ID=6270810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105601A Expired EP0205814B1 (fr) 1985-05-15 1986-04-23 Pompe d'injection de combustible

Country Status (4)

Country Link
US (1) US4702680A (fr)
EP (1) EP0205814B1 (fr)
JP (1) JPS61261652A (fr)
DE (2) DE3517521A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9610785D0 (en) * 1996-05-23 1996-07-31 Lucas Ind Plc Radial piston pump
JP3906775B2 (ja) * 2001-12-18 2007-04-18 株式会社デンソー 分配型燃料噴射ポンプ

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1955383A (en) * 1932-12-01 1934-04-17 Hermann John Frederick Injection pump for internal combustion engines
US2593550A (en) * 1946-03-28 1952-04-22 Fodor Nicholas Multiple unit fuel injection pump
DE882157C (de) * 1950-06-18 1953-07-06 Rudolf Dipl-Ing Schenk Entlueftungsvorrichtung an Kraftstoff-Einspritzpumpen
US2784040A (en) * 1953-07-15 1957-03-05 Cornelius R Head Retaining devices for pump liners
GB819858A (en) * 1957-04-17 1959-09-09 Bosch Gmbh Robert Improvements in or relating to fuel injection equipment
DE1109955B (de) * 1960-02-24 1961-06-29 Bosch Gmbh Robert Kraftstoffeinspritzpumpe an einer Brennkraftmaschine
CH401334A (de) * 1962-04-24 1965-10-31 Burckhardt Ag Maschf Kolbenmaschine für hohen Druck mit Einrichtung zur selbsttätigen Anpressung des Ventilkopfes
AT271997B (de) * 1965-12-24 1969-06-25 Bosch Gmbh Robert Verfahren zum Verändern der Fördercharakteristik von Kraftstoffeinspritzpumpen und Kraftstoffeinspritzpumpe zur Durchführung dieses Verfahrens
US3446427A (en) * 1966-07-23 1969-05-27 Leonid Fedorovich Vereschagin High-pressure plunger-type fluid compressors
DE2450521C2 (de) * 1974-10-24 1982-04-22 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffverteilereinspritzpumpe für Brennkraftmaschinen
DE2936205A1 (de) * 1979-09-07 1981-03-19 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe in verteilerbauart fuer brennkraftmaschinen
DE3018791A1 (de) * 1980-05-16 1981-11-26 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3136689A1 (de) * 1981-09-16 1983-03-24 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzpumpe fuer brennkraftmaschinen

Also Published As

Publication number Publication date
US4702680A (en) 1987-10-27
DE3517521A1 (de) 1986-11-20
EP0205814A1 (fr) 1986-12-30
DE3660829D1 (en) 1988-11-03
JPS61261652A (ja) 1986-11-19

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