EP0628704A1 - Wiederverwendungsvorrichtung von Schmiermittel in einer Brennkraftmaschine - Google Patents

Wiederverwendungsvorrichtung von Schmiermittel in einer Brennkraftmaschine Download PDF

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Publication number
EP0628704A1
EP0628704A1 EP94400886A EP94400886A EP0628704A1 EP 0628704 A1 EP0628704 A1 EP 0628704A1 EP 94400886 A EP94400886 A EP 94400886A EP 94400886 A EP94400886 A EP 94400886A EP 0628704 A1 EP0628704 A1 EP 0628704A1
Authority
EP
European Patent Office
Prior art keywords
passage
capacity
lubricant
volume
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.)
Granted
Application number
EP94400886A
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English (en)
French (fr)
Other versions
EP0628704B1 (de
Inventor
Pierre Duret
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0628704A1 publication Critical patent/EP0628704A1/de
Application granted granted Critical
Publication of EP0628704B1 publication Critical patent/EP0628704B1/de
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Expired - Lifetime legal-status Critical Current

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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
  • 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 mm2 and 10 mm2.
  • 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 crankcase 8 is expelled, at certain times in the combustion cycle, to a duct 11 connecting the pump crankcase 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 mm2 and 10 mm2.
  • 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)
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
FR9306784 1993-06-07
FR9306784A FR2706182B1 (fr) 1993-06-07 1993-06-07 Dispositif de recyclage de lubrifiant dans un moteur à combustion interne.

Publications (2)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029379A1 (de) * 1999-10-20 2001-04-26 Dolmar Gmbh Kompakter viertakt-verbrennungsmotor, insbesondere zur verwendung in einer tragbaren arbeitsvorrichtung
WO2002044528A1 (de) * 2000-11-30 2002-06-06 Roland Kirchberger Viertakt-verbrennungsmotor

Citations (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
DE3935789A1 (de) * 1989-10-27 1991-05-02 Dancho Zochev Dipl Ing Donkov Hubkolben-brennkraftmaschine mit kurbelgehaeuse-ladeluftpumpen

Patent Citations (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
DE3935789A1 (de) * 1989-10-27 1991-05-02 Dancho Zochev Dipl Ing Donkov Hubkolben-brennkraftmaschine mit kurbelgehaeuse-ladeluftpumpen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001029379A1 (de) * 1999-10-20 2001-04-26 Dolmar Gmbh Kompakter viertakt-verbrennungsmotor, insbesondere zur verwendung in einer tragbaren arbeitsvorrichtung
WO2002044528A1 (de) * 2000-11-30 2002-06-06 Roland Kirchberger Viertakt-verbrennungsmotor
US7073482B2 (en) 2000-11-30 2006-07-11 Roland Kirchberger Four-cycle internal combustion engine

Also Published As

Publication number Publication date
DE69400781D1 (de) 1996-11-28
DE69400781T2 (de) 1997-02-27
FR2706182A1 (fr) 1994-12-16
EP0628704B1 (de) 1996-10-23
FR2706182B1 (fr) 1995-07-21

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