EP0423601A2 - Pompe individuelle d'injection pour un moteur à combustion interne - Google Patents

Pompe individuelle d'injection pour un moteur à combustion interne Download PDF

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Publication number
EP0423601A2
EP0423601A2 EP90119362A EP90119362A EP0423601A2 EP 0423601 A2 EP0423601 A2 EP 0423601A2 EP 90119362 A EP90119362 A EP 90119362A EP 90119362 A EP90119362 A EP 90119362A EP 0423601 A2 EP0423601 A2 EP 0423601A2
Authority
EP
European Patent Office
Prior art keywords
injection
injection pump
rocker arm
tappet
piston
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.)
Withdrawn
Application number
EP90119362A
Other languages
German (de)
English (en)
Other versions
EP0423601A3 (en
Inventor
Wilfried Dr. Höfken
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.)
LOrange GmbH
Original Assignee
LOrange 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 LOrange GmbH filed Critical LOrange GmbH
Publication of EP0423601A2 publication Critical patent/EP0423601A2/fr
Publication of EP0423601A3 publication Critical patent/EP0423601A3/de
Withdrawn legal-status Critical Current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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/08—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/06—Pumps peculiar thereto
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams

Definitions

  • the invention relates to a single injection pump in a reciprocating piston design for an internal combustion engine with a tappet drive actuated by a camshaft arranged on the engine side for the main injection piston movable in a pump housing.
  • Such injection pumps for example known from US 45 27 738, periodically deliver fuel into the combustion chambers of the internal combustion engine, a separate injection pump being provided for each engine cylinder.
  • an injection pump in a reciprocating piston design is known, with a camshaft arranged in a pump housing, by means of which a main injection element is driven via a tappet drive and a pre-injection element via a rocker arm.
  • a main injection element is driven via a tappet drive and a pre-injection element via a rocker arm.
  • a pre-injection element With the pre-injection element, a smaller quantity of fuel is injected into the combustion chamber or a prechamber of the internal combustion engine before the main fuel quantity in order to achieve an improved combustion process.
  • the pre-injection could also take place via a separate pre-injection pump, which is arranged parallel to the main injection pump and, just like the latter, is driven via a common camshaft, but each pump has its own Cam on the common shaft is operated. In this case, two injection pumps would then be required for each engine cylinder.
  • the known arrangements have the disadvantage that high structural complexity is required either in the form of twice the number of injection pumps and cams or, in the case of injection pumps with their own camshaft, the pump housing becomes very large because of the space required for the additional drive of the pre-injection element. Furthermore, the previously known arrangements cause increased susceptibility to faults and increased maintenance.
  • the object is achieved in that a preinjection element is arranged in the same pump housing, the tappet drive of which is removed from the tappet drive for the main injection piston via a rocker arm.
  • a major advantage of the invention is that the drive of the injection pump is not changed. It takes place in a conventional manner via the cam provided so far from the camshaft of the internal combustion engine.
  • the drive of the pilot injection pump is removed from the tappet drive of the main injection element, which advantageously simultaneously synchronizes the two piston movements.
  • the construction according to the invention advantageously makes it possible to use even confined spaces on the engine for the arrangement of the pilot injection pump, whereas in conventional designs space would be required for a number of additional injection pumps corresponding to the number of engine cylinders for the pilot injection.
  • both the length and the position of the drive rocker arm or a rocker arm shaft can be designed to match the spatial conditions on the internal combustion engine, the available space in the engine compartment can be used well.
  • an optimal speed of the pre-injection piston can be set by constructively varying the two lever arm lengths of the rocking lever. Due to the angular position between the two lever arms against each other, the time for the start of the pre-injection can also be determined.
  • the second lever arm can be designed as a cam or lever arm and is arranged on the rocker arm shaft.
  • the pre-injection-side, second lever arm can be made longer than the main injection-side first lever arm.
  • the rocker arm comprises a rocker arm shaft mounted in the pump housing, on which a first lever arm is fastened, the free end of which receives the lifting movement of a first plunger of the main injection piston and via a second lever or cam, which is also fastened to the rocker arm shaft transmits via a second tappet to the pre-injection piston of the pre-injection pump element.
  • An advantageous development of the invention provides that the first lever arm is forked, and the two fork arms are seated at opposite locations on the annular end face of a tappet cup interacting with the tappet. This embodiment advantageously ensures that tilting of the tappet cup cannot occur.
  • the tappet-side ends of the fork arms are supported via rolling elements.
  • rollers or balls are suitable as rolling elements, which can be articulated on the forks or are directly supported in the gabein with approximately half of their circumference.
  • Another preferred embodiment of the invention provides that the second lever (cam) for the pre-injection piston and the two fork arms are axially spaced on the same side of the rocker arm shaft.
  • the lever ratio on the rocker arm is preferably selected between 1: 1 and 5: 1.
  • the exact choice of the lever ratio will have to be made depending on the geometry of the injection pistons in coordination with the fuel quantities to be injected.
  • the pilot injection pump element has its own housing, which is detachably attached to the pump housing.
  • the injection pump 1 shown in FIG. 1 essentially comprises a main injection piston 2 for the main injection and a pre-injection piston 3 of smaller cross-section for the pre-injection.
  • the main injection piston 2 is immersed in a piston chamber 4, which communicates with inlet openings 5 and at least one outlet valve 6.
  • fuel is drawn into the piston chamber 4 by moving the main injection piston 2 in the direction of its bottom dead center via an inflow bore 7, an annular space 8, and the inlet openings 5.
  • the fuel is supplied via line 9 to an injection nozzle (not shown) when the opening pressure of the outlet valve 6 is exceeded.
  • the main injection piston 2 is driven via the schematically illustrated camshaft 10 of an internal combustion engine.
  • the movement of the main injection piston 2 via the camshaft 10 takes place against the force of a return spring 11 which is guided in a tappet cup 12 coupled to the injection piston 2.
  • the tappet cup 12 is guided in a cylindrical bore 13 of the pump housing 14.
  • the pre-injection element is filled in such a way that inlet openings 15 connect a pre-injection piston chamber 16 to an annular space 18, which is connected to the annular space 8 by means of the line 17.
  • a second outlet valve 19 closes the pre-injection piston chamber 16 from a pre-injection line 20, which in turn is connected to an injection nozzle, not shown.
  • the pre-injection piston 3 is driven by means of a rocker arm 21, which transfers the stroke movement of the tappet cup 12 to a second tappet cup 24 of the pre-injection element.
  • the rocker arm 21 comprises a rocker arm shaft 30 with which it is mounted in the pump housing 14.
  • a first lever arm 26 of the rocker arm 21 is supported by a roller 28 on the annular end face 27 of the tappet cup 12, while a second lever arm 22 of the rocker arm 21 interacts with the second tappet cup 24.
  • the pilot injection piston 3 is moved in an oscillating manner against the force of a second return spring 23 via the tappet cup 24.
  • the second return spring 23 is guided in the second tappet cup 24.
  • the two injection pistons 2 and 3 can be rotated in the circumferential direction to change the start or end of injection, which is done using devices that are not shown in detail.
  • the intervention takes place by means of the ring gear 25 shown on the pre-injection piston 3.
  • the rocker arm 21 is shown schematically in FIG. 2 in an oblique view. According to the illustrated embodiment, this has a first lever arm 26 consisting of two fork arms 26a, 26b, which is attached to a rocker arm shaft 30.
  • the two fork arms 26a, 26b are provided with rollers 28a, 28b to ensure a uniform axial To ensure load on the tappet cup 12.
  • the rocker arm shaft 30 is designed as a hollow shaft.
  • the first lever arm 26 has a groove which is semicircular in section and in which a roller 28c is mounted. By means of the holder 33 attached to the lever arm 26, the roller 28c is prevented from falling out during assembly / disassembly of the injection pump.
  • the second lever arm 22 is connected to the pilot injection piston 3 in the same way.
  • the lever arms 26 and 22 are preferably welded to the rocker arm shaft 30.
  • FIG. 3 differs from that of FIG. 1 in that the pre-injection element has its own housing 34 which is detachably fastened to the pump housing 14.
  • FIG. 4 shows how the arm 26a, 26b consisting of two welded-on fork arms 26 rests on the tappet cup 12.
  • the rocker arm 31 is supported by bearings 37a, 37b in the pump housing (not shown).
  • the second lever 22 is attached by means of a detachable connection 35 on the rocker arm shaft 30 in an adjustable manner in discrete angular steps, so that the intermediate angle ⁇ shown in FIG. 3 can be changed.
  • the second lever 22 is longer than the fork arms 26a, 26b. This arrangement enables adaptation to changed stroke / cross-sectional ratios of the pre-injection piston 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19900119362 1989-10-18 1990-10-09 Individual injection pump for an internal combustion engine Withdrawn EP0423601A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934742 1989-10-18
DE3934742 1989-10-18

Publications (2)

Publication Number Publication Date
EP0423601A2 true EP0423601A2 (fr) 1991-04-24
EP0423601A3 EP0423601A3 (en) 1991-10-09

Family

ID=6391710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900119362 Withdrawn EP0423601A3 (en) 1989-10-18 1990-10-09 Individual injection pump for an internal combustion engine

Country Status (1)

Country Link
EP (1) EP0423601A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027135A3 (fr) * 1994-04-02 1995-11-09 Robert Bosch Gmbh Pompe d'injection de carburant

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB359611A (en) * 1929-09-09 1931-10-29 Knut Jonas Elias Hesselman Improvements relating to devices for injecting fuel into internal combustion engines
GB393922A (en) * 1930-09-30 1933-06-15 Fiat Spa Improvements in or relating to fuel pumps for internal combustion engines
GB395601A (en) * 1932-01-08 1933-07-20 Fried Krupp Germaniawerft Ag An improved method of and apparatus for fuel injection in internal combustion engines
GB436987A (en) * 1934-08-03 1935-10-22 Crossley Brothers Ltd Improvements in fuel injection pumps for compression ignition oil engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027135A3 (fr) * 1994-04-02 1995-11-09 Robert Bosch Gmbh Pompe d'injection de carburant

Also Published As

Publication number Publication date
EP0423601A3 (en) 1991-10-09

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