EP0057674A2 - Pompe d'injection de combustible pour moteurs à combustion interne, notamment moteurs Diesel - Google Patents

Pompe d'injection de combustible pour moteurs à combustion interne, notamment moteurs Diesel Download PDF

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Publication number
EP0057674A2
EP0057674A2 EP82890007A EP82890007A EP0057674A2 EP 0057674 A2 EP0057674 A2 EP 0057674A2 EP 82890007 A EP82890007 A EP 82890007A EP 82890007 A EP82890007 A EP 82890007A EP 0057674 A2 EP0057674 A2 EP 0057674A2
Authority
EP
European Patent Office
Prior art keywords
pump piston
pump
fuel injection
plunger
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.)
Granted
Application number
EP82890007A
Other languages
German (de)
English (en)
Other versions
EP0057674B1 (fr
EP0057674A3 (en
Inventor
Theodor Dr. Dipl.-Ing. Stipek
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.)
Friedmann and Maier AG
Original Assignee
Friedmann and Maier 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 Friedmann and Maier AG filed Critical Friedmann and Maier AG
Publication of EP0057674A2 publication Critical patent/EP0057674A2/fr
Publication of EP0057674A3 publication Critical patent/EP0057674A3/de
Application granted granted Critical
Publication of EP0057674B1 publication Critical patent/EP0057674B1/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
    • 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
    • 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

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines, in particular diesel engines, in which the pump and nozzle are combined to form a common structural unit, with a slide tappet for driving the pump piston.
  • Such injection devices are usually arranged in the cylinder head of the engines, the drive parts protruding vertically or obliquely upwards out of the cylinder head and being driven directly or indirectly by the engine camshaft via a rocker arm, rocker arm, bucket tappet or a similar device.
  • the invention now aims to further develop an embodiment of the type mentioned at the outset such that the penetration of wear particles into the annular gap between the pump piston and the pump piston bushing is made considerably more difficult or prevented.
  • the invention consists essentially in the fact that a sealing element is provided at the immersion point of the pump piston in the pump piston sleeve against the occurrence of wear particles in the annular gap between the pump piston and the pump piston sleeve.
  • the abrasion particles can, in particular, result from the movement of the slide tappet in the guide path, which is mostly hollow cylindrical, and it is therefore preferably the design is such that the sealing element is designed as a tubular part, the axis of which is arranged coaxially with the axis of the pump piston, the inside diameter is greater than the diameter of the pump piston and the upper edge in the highest position of the hollow-cylindrical sliding plunger into the cavity of the slide plunger. Due to the fact that the tubular part dips into the cavity of the slide tappet, the abrasion particles of the slide tappet or the guideway can only sink outside this tubular part and do not come into direct contact with the sealing gap between the pump piston and the pump piston sleeve.
  • the abrasion particles can be rinsed out via a radial passage opening provided at the lower end of the guideway of the slide ram, with the immersion of the tubular part in the cavity of the slide ram resulting in a type of labyrinth seal which prevents penetration via this passage opening Rinsing the abrasion particles prevents any contamination that may occur into the sealing gap between the pump piston and the pump piston sleeve.
  • the design can also be such that the sealing element is designed as an annular disk, which is preferably made of felt or the like. exists and is held in place by a locking ring.
  • FIG. 1 shows a longitudinal section through a pump-nozzle assembly
  • FIG. 2 shows a modified embodiment of the upper part of such a pump-nozzle assembly facing away from the nozzle.
  • Fig. 1, 1 is a slide ram for driving a pump piston 2.
  • the pump piston plunges into the pump piston sleeve 4 at 3 and is rotationally connected to a pin 5 for the attack of the delivery rate adjustment member.
  • the pump spring 6 is supported on the engine block 9 by means of a spring plate 7 against the clamping flange 8 for fixing the injection pump nozzle assembly.
  • the setting is made on the engine block 9 by means of tensioning screws 10.
  • a nozzle needle spring housing 12 for the nozzle needle 13 connects to the working chamber 11 of the injection pump in the axial direction of the pump piston 2, the nozzle needle spring being designated by 14.
  • the nozzle needle spring housing 12 is screwed through a union nut 15 to a ring extension 16 of the pump piston bushing 4 which projects downwards.
  • the pump piston sleeve 4 is pressed concentrically to the axis of the pump piston 2, a tubular part 17, the clear width of which is greater than the width of the pump piston 2.
  • the upper edge 18 of the tubular part 17 overlaps the lower edge 19 of the sliding plunger 1 in the highest position of the slide ram 1, so that the tubular part 17 projects into the hollow cylindrical or hollow conical part 20 of the slide ram 1.
  • the sliding plunger is slidably guided in the interior of an upwardly projecting annular shoulder 21 of the pump piston liner 4, a radial opening 23 being provided at the lower edge of the sliding surface defined by the inner surface 22 of this annular shoulder 21.
  • the wear particles of the slide plunger 1 can be rinsed out via this radial passage opening 23. Given if contaminants sucked in via this radial passage opening 23 cannot enter directly into the annular gap 3 between the pump piston sleeve and the pump piston, but would first have to take the labyrinth path via the interior of the hollow slide valve into the narrow annular space between the tubular part 17 and the pump piston 2. The occurrence of such contaminants is thus prevented.
  • Impact protection is designated by 24.
  • FIG. 2 the reference numerals of FIG. 1 have been retained for components that remain the same.
  • a sealing element 25 made of plastic, felt or the like. intended.
  • This first sealing element can be covered in the axial direction of the pump piston 2 in the direction of the plunger 1 by an annular disk 26, which in turn can also be designed as a sealing element.
  • a clamping ring 27 is used to secure the position, which is locked in a circumferential groove 28 of the slide guide 22 of the plunger 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19820890007 1981-02-02 1982-01-19 Pompe d'injection de combustible pour moteurs à combustion interne, notamment moteurs Diesel Expired EP0057674B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT458/81 1981-02-02
AT45881A AT372502B (de) 1981-02-02 1981-02-02 Kraftstoffeinspritzpumpe fuer brennkraftmaschinen, insbesondere dieselmotoren

Publications (3)

Publication Number Publication Date
EP0057674A2 true EP0057674A2 (fr) 1982-08-11
EP0057674A3 EP0057674A3 (en) 1982-09-01
EP0057674B1 EP0057674B1 (fr) 1984-12-12

Family

ID=3491163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820890007 Expired EP0057674B1 (fr) 1981-02-02 1982-01-19 Pompe d'injection de combustible pour moteurs à combustion interne, notamment moteurs Diesel

Country Status (3)

Country Link
EP (1) EP0057674B1 (fr)
AT (1) AT372502B (fr)
DE (1) DE3261482D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369151A1 (fr) * 1988-11-14 1990-05-23 Robert Bosch Ag Pompe d'injection combinée avec l'injecteur et dispositif de fixation
GB2290585A (en) * 1994-06-24 1996-01-03 Nippon Denso Co Fuel pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3736198A1 (de) * 1987-10-26 1989-05-18 Voest Alpine Automotive Kraftstoffeinspritzduese fuer brennkraftmaschinen
DE3811844C1 (fr) * 1988-04-08 1989-12-14 Voest-Alpine Automotive Ges.M.B.H., Linz, At

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1054593A (fr) * 1952-04-17 1954-02-11 Perfectionnement aux pompes à liquide sous pression, notamment aux pompes d'injection
US2792259A (en) * 1953-07-03 1957-05-14 Int Harvester Co Fuel injector for internal combustion engines
FR1197743A (fr) * 1957-09-19 1959-12-02 Kugelfischer G Schaefer & Co Pompe d'injection pour moteurs à combustion interne
US3409225A (en) * 1966-06-14 1968-11-05 Int Harvester Co Mechanical injector having needleseating spring
FR2366460A1 (fr) * 1976-10-04 1978-04-28 Friedmann & Maier Ag Dispositif d'injection de carburant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1054593A (fr) * 1952-04-17 1954-02-11 Perfectionnement aux pompes à liquide sous pression, notamment aux pompes d'injection
US2792259A (en) * 1953-07-03 1957-05-14 Int Harvester Co Fuel injector for internal combustion engines
FR1197743A (fr) * 1957-09-19 1959-12-02 Kugelfischer G Schaefer & Co Pompe d'injection pour moteurs à combustion interne
US3409225A (en) * 1966-06-14 1968-11-05 Int Harvester Co Mechanical injector having needleseating spring
FR2366460A1 (fr) * 1976-10-04 1978-04-28 Friedmann & Maier Ag Dispositif d'injection de carburant

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369151A1 (fr) * 1988-11-14 1990-05-23 Robert Bosch Ag Pompe d'injection combinée avec l'injecteur et dispositif de fixation
GB2290585A (en) * 1994-06-24 1996-01-03 Nippon Denso Co Fuel pump
US5567134A (en) * 1994-06-24 1996-10-22 Nippondenso Co., Ltd. High-pressure fuel-feed pump
GB2290585B (en) * 1994-06-24 1998-03-11 Nippon Denso Co Fuel pump

Also Published As

Publication number Publication date
AT372502B (de) 1983-10-25
DE3261482D1 (en) 1985-01-24
EP0057674B1 (fr) 1984-12-12
ATA45881A (de) 1983-02-15
EP0057674A3 (en) 1982-09-01

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