EP0628704B1 - Wiederverwendungsvorrichtung von Schmiermittel in einer Brennkraftmaschine - Google Patents

Wiederverwendungsvorrichtung von Schmiermittel in einer Brennkraftmaschine Download PDF

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Publication number
EP0628704B1
EP0628704B1 EP19940400886 EP94400886A EP0628704B1 EP 0628704 B1 EP0628704 B1 EP 0628704B1 EP 19940400886 EP19940400886 EP 19940400886 EP 94400886 A EP94400886 A EP 94400886A EP 0628704 B1 EP0628704 B1 EP 0628704B1
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EP
European Patent Office
Prior art keywords
passage
volume
passages
lubricant
pump housing
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
EP19940400886
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English (en)
French (fr)
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EP0628704A1 (de
Inventor
Pierre Duret
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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Publication of EP0628704A1 publication Critical patent/EP0628704A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/08—Separating lubricant from air or fuel-air mixture before entry into cylinder

Definitions

  • the present invention relates to the field of two-stroke internal combustion engines in which pneumatic fuel injection is carried out.
  • the pressure source necessary for the pneumatic fuel injection can be external to the engine, or it can be internal: in the latter case, the pressure source can be constituted by the cylinder crankcase in which the injection takes place either by the cylinder itself or by another pump housing or by another cylinder.
  • Document FR-2.575.523 shows an internal combustion engine which in fact combines two sources of pressure: the pump housing and the exhaust to improve pneumatic injection.
  • the outside air admitted into the pump housing by any means known per se is therefore pressurized in the pump housing itself by the downward movement of the piston.
  • This air can leave the pump housing by two types of ducts: In the first type of so-called "transfer” ducts, air is conveyed from the pump housing to the combustion chamber. This non-carburetted air is introduced before the admission of air used for pneumatic injection, in order to carry out a sweeping of the combustion chamber.
  • conduits which are also connected to the combustion chamber. These conduits are generally fitted with a non-return valve.
  • the non-return valve opens a line (or capacity) connecting the pump crankcase to the fuel mixture admission passage in the combustion chamber.
  • the valve closes when the pressure in the pump casing becomes lower than the pressure in the line, the latter can be considered as a pressure storage capacity since the fluid which passes through it is at a pressure greater than or equal to the maximum pressure prevailing in the pump housing.
  • the air from the pump housing contains a certain amount of lubricant.
  • This lubricant is first introduced with the air admitted into the pump housing to lubricate the moving parts: bearings, piston, jacket ....
  • the air which then passes through the tank remains charged with lubricant.
  • lubricant When the air thus charged crosses the capacity, a part of this lubricant can be deposited on the walls, in layers then it can accumulate for example in the lower zone of the capacity.
  • the present invention provides a simple solution, easy to implement, and which responds well to the problem created by the accumulation of lubricant in a pressurized gas line participating in pneumatic injection.
  • the present invention is particularly well suited to two-stroke engines, the pneumatic injection line of which is connected to a pump housing.
  • the invention relates to a device intended for recycling a lubricant accumulated in a capacity of an internal combustion engine with pneumatic fuel injection, the capacity connecting the crankcase of said engine to an inlet for admitting fuel under pressure into the combustion chamber, the inlet opening being fitted with an intermittent shutter element and the capacity comprising a non-return valve.
  • the device according to the invention is characterized in that it comprises at least one calibrated passage passing through the partition wall between said capacity and said pump housing, and in that the end of the passage through which the lubricant leaves the capacity is located at the lowest point of said capacity.
  • the cross section of the passage or passages, on the side of said capacity can be between 0.5 mm 2 and 10 mm 2 .
  • the passage or passages may have a constant section over their entire length.
  • the passage or passages may have a non-constant section over their entire length.
  • This figure shows a longitudinal section of an engine to which the invention applies.
  • the engine may comprise, in known manner, at least one cylinder 1 in which slides a piston 2 moved by a connecting rod-crank system 3, an exhaust duct 4, an ignition element 5, such as a spark plug, an element of intermittent closure of the intake such as a valve 6, at least one transfer duct 7 intended to bring the purging air from a pump housing 8 into the combustion chamber 1.
  • An intake port 9 provided with an adjustment element 10 allows outside air to be admitted into the pump housing 8.
  • Another part of the air present in the pump housing 8 is expelled, at certain times in the combustion cycle, to a duct 11 connecting the pump housing 8 to the combustion chamber 1.
  • the duct 11 is in fact a pressure storage capacity since it is provided with a non-return valve 12 preferably placed near the pump housing 8.
  • An injector 13, known per se, is placed near the other end of the tank 11 in order to introduce fuel into the stream of pressurized air.
  • the injector 13 being placed just upstream of the valve 6, a fuel mixture is formed in this zone located near the intake orifice (not referenced) which, of course, is injected into the combustion chamber when the valve is far from its seat.
  • lubricant can accumulate in particular at the bottom of the capacity 11.
  • the calibrated passage 14 preferably provides communication between the capacity 11 and the pump housing 8.
  • the calibrated passage 14 has a substantially vertical axis (not referenced); the axis of the engine cylinders being inclined by about 20 ° in the example of this figure.
  • the vertical orientation facilitates the downward flow, that is to say towards the pump housing.
  • the oil (or any other lubricating element) which accumulates by gravity at the bottom of the capacity 11 can flow through the passage 14.
  • the passage 14 must be of small section so as not to generate a pressure drop in the capacity 11.
  • the cross section of the passage 14 may or may not be constant over its entire length.
  • the section of the passage or the cumulative section of the passages, on the capacity side is between 0.5 mm 2 and 10 mm 2 .
  • the oil is therefore returned directly to the pump housing 8 where it is sprayed by the positive pressure difference prevailing between the capacity 11 and the pump housing 8 during the most of the engine rotation cycle.
  • the oil can thus, by this recycling, again contribute to the lubrication of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Dazu bestimmte Vorrichtung ein in einem Raum (11) eines Verbrennungsmotors mit Kraftstofflufteinspritzung angesammeltes Schmiermittel zu rezyklieren, wobei der Raum eine Gehäusepumpe (8) dieses Motors mit einer Einlaßöffnung für dieses vergaste Gemisch unter Druck in die Brennkammer (1) verbindet, die öffnung mit einem intermittierenden Verschlußelement (6) ausgestattet ist und der Raum ein Rückschlagventil (12) aufweist, dadurch gekennzeichnet, daß sie wenigstens einen kalibrierten Durchlaß (14) umfaßt, der die Trennwand zwischen dem Raum (11) und dieser Gehäusepumpe (8) durchsetzt und daß das Ende dieses Durchlasses (14) über das das Schmiermittel diesen Raum (11) verläßt, am tiefsten Punkt des Raums (11) angeordnet ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Querschnitt des oder der Durchlässe (14) auf der Seite des Raums (11) zwischen 0,5 mm2 und 10 mm2 beträgt.
  3. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der oder die Durchlässe (14) einen konstanten Querschnitt über deren Gesamtlänge aufweisen.
  4. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der oder die Durchlässe (14) einen nicht konstanten Querschnitt über deren gesamte Länge aufweisen.
  5. Vorrichtung nach einem der vorhegehenden Ansprüche, dadurch gekennzeichnet, daß der oder die kalibrierten Durchlässe (14) eine vertikal orientierte Längsachse aufweisen.
EP19940400886 1993-06-07 1994-04-25 Wiederverwendungsvorrichtung von Schmiermittel in einer Brennkraftmaschine Expired - Lifetime EP0628704B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306784A FR2706182B1 (fr) 1993-06-07 1993-06-07 Dispositif de recyclage de lubrifiant dans un moteur à combustion interne.
FR9306784 1993-06-07

Publications (2)

Publication Number Publication Date
EP0628704A1 EP0628704A1 (de) 1994-12-14
EP0628704B1 true EP0628704B1 (de) 1996-10-23

Family

ID=9447820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940400886 Expired - Lifetime EP0628704B1 (de) 1993-06-07 1994-04-25 Wiederverwendungsvorrichtung von Schmiermittel in einer Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0628704B1 (de)
DE (1) DE69400781T2 (de)
FR (1) FR2706182B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29918516U1 (de) * 1999-10-20 2001-03-01 Dolmar GmbH, 22045 Hamburg Kompakter Viertakt-Verbrennungsmotor, insbesondere zur Verwendung in einer tragbaren Arbeitsvorrichtung
AT411091B (de) * 2000-11-30 2003-09-25 Kirchberger Roland Dipl Ing Viertakt-verbrennungsmotor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB240447A (en) * 1924-09-25 1926-08-05 Paul Frederick Hackethal Improvements in means and methods for preventing the escape of lubricating oil past the piston head of engines and pumps
US3672172A (en) * 1971-03-15 1972-06-27 Gary L Hammond Simplified supercharged internal combustion engine with emissions control
US3973532A (en) * 1973-11-09 1976-08-10 Harold Litz Crankcase-scavenged four stroke engine
DE3731250C1 (en) * 1987-09-17 1988-10-06 Zochev Donkov Dancho Dipl Ing Reciprocating piston internal combustion engine with crankcase charge air pumps
US4962745A (en) * 1988-10-04 1990-10-16 Toyota Jidosha Kabushiki Kaisha Fuel supply device of an engine
DE3935789C2 (de) * 1989-10-27 1995-10-12 Dancho Zochev Dipl Ing Donkov Hubkolben-Brennkraftmaschine mit Kurbelgehäuse-Ladeluftpumpe und Ladeluftkühler

Also Published As

Publication number Publication date
EP0628704A1 (de) 1994-12-14
FR2706182B1 (fr) 1995-07-21
DE69400781D1 (de) 1996-11-28
FR2706182A1 (fr) 1994-12-16
DE69400781T2 (de) 1997-02-27

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