EP1067276B1 - Internal-combustion engine provided with a device for purifying the crankcase breather gases - Google Patents

Internal-combustion engine provided with a device for purifying the crankcase breather gases Download PDF

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Publication number
EP1067276B1
EP1067276B1 EP00114664A EP00114664A EP1067276B1 EP 1067276 B1 EP1067276 B1 EP 1067276B1 EP 00114664 A EP00114664 A EP 00114664A EP 00114664 A EP00114664 A EP 00114664A EP 1067276 B1 EP1067276 B1 EP 1067276B1
Authority
EP
European Patent Office
Prior art keywords
crankcase
chamber
filter
gases
oil
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
EP00114664A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1067276A1 (en
Inventor
Giancarlo Dellora
Domenico Palmisani
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.)
Iveco SpA
Original Assignee
Iveco SpA
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Filing date
Publication date
Application filed by Iveco SpA filed Critical Iveco SpA
Publication of EP1067276A1 publication Critical patent/EP1067276A1/en
Application granted granted Critical
Publication of EP1067276B1 publication Critical patent/EP1067276B1/en
Anticipated expiration legal-status Critical
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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil

Definitions

  • the present invention relates to an internal-combustion engine provided with a device for purifying the breather gases in the crankcase of said engine.
  • crankcase breather circuit designed to discharge to the outside of said crankcase the so-called breather or blow-by gases, i.e. gases which escape from the cylinders into the crankcase via the piston rings. This breathing is necessary both to prevent an increase in pressure inside the crankcase and to compensate for the variations in volume caused by the movement of the pistons.
  • the blow-by gases contain particles of finely atomised oil, as well as particles of unburnt matter of carbon type (particulates) having dimensions or the order of several ⁇ m, typically between 5 and 8 ⁇ m.
  • the breather circuit is of the open type, i.e. it discharges the blow-by gases into the atmosphere; in this case, the oil and particulates have to be separated from the gases for obvious reasons relating to environmental and health protection (the particulates have carcinogenic effects).
  • the breather circuit is of the closed type and recirculates the blow-by gases to the engine intake system so as to ensure the complete combustion of the particulates.
  • the problem arises of removing oil and particulates from these gases; in fact, the oil and particulates tend to form resinous sediments on the components through which the gases pass before reaching the cylinders (particularly, on the valves and, for forced-induction engines, in the compressor and intercooler, where they greatly reduce the heat exchange), thus compromising the satisfactory operation of said components.
  • the combustion of any engine oil recirculated to the intake system has harmful effects on the catalytic converter and on the Lambda sensor.
  • purifiers of various types comprising, for example, impact separators, filter elements or a combination of the two.
  • devices are known e.g. from EP 810 351 for purifying the crankcase breather gases, which comprise an inlet communicating with the interior of engine crankcase so as to receive the breather gases containing oil in suspension, an outlet for the purified breather gases, a filter element interposed between the inlet and the outlet, and an oil- collecting chamber communicating with the interior of the crankcase via a drain valve designed to allow the passage of the oil accumulated in the chamber towards the crankcase but to prevent the reflux of gases in the opposite direction.
  • EP 658 635 discloses a device for purifying gases from a crankcase comprising an electrostatic precipitator.
  • EP 563 565 discloses a valved cup assembly for renting gases from a crankcase.
  • the object of the present invention is to devise an internal-combustion engine with a device for purifying the crankcase breather gases, provided with a drain valve of improved type, which is designed to operate efficiently, reliably and fully automatically so as to prevent any undesirable accumulations of oil.
  • an internal-combustion engine comprising a device for purifying the crankcase breather gases of said engine, said device comprising an inlet communicating with the interior of the engine crankcase so as to receive the breather gases containing oil and particulates in suspension, an outlet for the purified breather gases, a filter interposed between the inlet and the outlet, a chamber for collecting the oil separated by said filter, and a drain valve interposed between said chamber and the inside of the crankcase so as to allow the passage of the oil accumulated in the chamber towards the crankcase and prevent the reflux of unpurified gas in the opposite direction, said valve comprising at least one opening for the passage of oil from said chamber to said crankcase and a sealing element co-operating fluidtightly with said opening under the action of the pressure of the gases in said crankcase, said sealing element being sensitive to fluctuations in pressure inside the crankcase so as to allow oil to escape through said opening when the pressure in the crankcase falls below a predetermined threshold value characterised in that said opening is formed in
  • the reference numeral 1 denotes an internal-combustion engine comprising a cylinder head 2, a plurality of cylinders 3, a crankcase 4 and a sump 5 designed to contain lubricating oil.
  • the engine 1 is further provided with a circuit 8 for recirculating the so-called blow-by gases, i.e. the gases which flow into the crankcase 4 by passing between the cylinders 3 and the associated pistons 6.
  • a circuit 8 for recirculating the so-called blow-by gases, i.e. the gases which flow into the crankcase 4 by passing between the cylinders 3 and the associated pistons 6.
  • These gases contain in suspension finely atomised particles of oil, as well as solid particles (particulates), predominantly of carbon type, which are partly formed by partially unburnt products of combustion and partly by solid impurities normally present in the oil.
  • the recirculation circuit which is not illustrated in detail as it is known, comprises a purifying device 7 ( Figure 2) having an inlet opening (not shown) communicating with the interior of the crankcase 4 and an outlet connection 9 designed to be connected to the intake system (not shown) of the engine.
  • the purifying device 7 comprises, in known manner, an impact separator 10 for capturing the coarsest particles and a filter 11 for separating the residual particles, preferably of the coalescent type, disposed in series between one another and forming an integrated unit provided with a common casing 12.
  • the casing 12 is secured to the engine 1 by means of a plurality of screws 13 in alignment with an opening of a protecting case 15 for the timing gear 16 and flywheel 17 of the engine 1, for which it substantially defines a closure cover.
  • the casing 12 has a box-type inlet portion 18 provided with a plurality of internal baffles 20 defining the impact separator 10 and designed to provide a tortuous path for the gases; the geometry of the various ducts delimiting the path of the gases will not be described in detail since it does not form part of the present invention.
  • the casing 12 also defines an inlet chamber 21 ( Figure 3) for the filter 11, of substantially rectangular shape, into which the gases flow upon leaving the impact separator 10.
  • the filter 11 comprises a filter element 22, in the form of a rectangular cartridge, which is mounted between a peripheral flange 23 of the inlet chamber 21 and a corresponding flange 24 of a detachable cover 25 secured to the casing 12 by means of a plurality of screws 26.
  • the filter element 22 is formed by a cartridge of non-woven fabric consisting of fibre with variable porosity along its thickness; the fabric is crimped so as to increase the filtering surface area for the same dimensions.
  • the retention capacity of the filter element 19 is such that it allows to pass, per se, the particulates and has a coalescent action.
  • the cover 25 defines an outlet chamber 27 for the filter 11 and forms integrally the outlet connector 9 of the device 7.
  • the cover 25 further defines integrally a drain duct 32 ( Figures 2 and 3) extending from the bottom of the outlet chamber 27 of the filter 11 and communicating with an oil-collecting chamber 28, the casing 12 of which forms integrally a front wall and the side walls.
  • the chamber 28 is bounded downwardly by a pair of side walls 29 which are downwardly inclined and which are mutually convergent in alignment with a bottom portion 30 of the chamber itself.
  • the chamber 28 is closed rearwardly by a substantially flat wall 32 suitably welded to the side walls.
  • the chamber 28 communicates with the interior of the crankcase 4 through a drain valve 33 designed to allow the passage of oil from the chamber itself towards the crankcase but not the reflux of blow-by gases in the opposite direction.
  • the valve 33 is formed by a plurality of openings 34 provided in the rear wall 31 in alignment with the bottom portion 30, for example six holes disposed in a circle and equidistant from one another, and by a shut-off member 35 mounted in the wall 31 and designed to close fluidtightly the openings 34 under the pressure of the blow-by gases.
  • the shut-off member 35 is made of elastomeric material and is substantially umbrella-shaped; it comprises integrally a spigot 36 force-fitted in a hole 37 in the wall 31 provided at the centre of the circle defined by the openings 34, in which it is retained axially by an integral annular retaining projection 41, and a flexible sealing element 38 formed by an annular flange extending from one axial end 39 of the spigot 36 and disposed on the side of the wall 31 facing towards the outside of the chamber 28, i.e. towards the interior of the crankcase 4.
  • the sealing element 38 has a peripheral lip 40 designed to co-operate with the wall 31 under the pressure of the blow-by gases, in an annular zone surrounding the openings 34.
  • the mode of operation of the purifying device 7 is as follows.
  • blow-by gases with the oil and particulates in suspension flow into the impact separator 10, in which the coarsest particles of oil are separated from the flow by inertia and they collide with the baffles 20; the oil thus purified runs into the crankcase 4.
  • the flow of gas from which the coarsest oil particles have been removed thus enters the chamber 21 and the filter element 22.
  • the particles of oil pass into the interior of the filter element 22, where they agglomerate by coalescence so as to form drops of sufficient size to prevent them from being entrained downstream; therefore, the oil runs from the outlet chamber 27 of the filter 11 into the collecting chamber 28 via the drain duct 32.
  • the particulates which in the absence of oil would tend to pass through the filter element 22, are immersed in the drops of oil which agglomerate in the element itself.
  • the oil which collects in the chamber 28 tends to flow into the crankcase 4 through the openings 24 of the wall 31 of the chamber. If an overpressure prevails in the crankcase 4 in relation to the chamber 28, the sealing element 38 closes the openings 34, thereby preventing the reflux of contaminated blow-by gases (Figure 5).
  • the dimensions of the sealing element 38 are such that the seal is broken whenever the value of the pressure inside the crankcase falls below a predetermined threshold value; under the action of the cyclical variations in pressure inside the crankcase when the engine is running, the sealing element 38 allows small amounts of oil to escape into the crankcase even when the engine is operative.
  • valve 33 with a sealing element 35 [sic] which is sensitive to the variations in pressure inside the crankcase makes it possible to discharge the oil from the chamber 28 in an efficient, simple and reliable manner, thus preventing any undesirable accumulations and without any need for control.
  • valve 33 of the type described is particularly simple and inexpensive to produce and assemble.
  • valve 33 can be replaced by a lamella-type valve, a diaphragm valve or a valve with a movable closure means, provided that it is sufficiently sensitive to fluctuations in pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
EP00114664A 1999-07-09 2000-07-07 Internal-combustion engine provided with a device for purifying the crankcase breather gases Expired - Lifetime EP1067276B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999TO000605A IT1310094B1 (it) 1999-07-09 1999-07-09 Motore endotermico provvisto di un dispositivo di depurazione dei gasdi sfiato del basamento.
ITTO990605 1999-07-09

Publications (2)

Publication Number Publication Date
EP1067276A1 EP1067276A1 (en) 2001-01-10
EP1067276B1 true EP1067276B1 (en) 2005-02-09

Family

ID=11417958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00114664A Expired - Lifetime EP1067276B1 (en) 1999-07-09 2000-07-07 Internal-combustion engine provided with a device for purifying the crankcase breather gases

Country Status (6)

Country Link
EP (1) EP1067276B1 (it)
JP (1) JP2001065327A (it)
AT (1) ATE288999T1 (it)
DE (1) DE60017986T2 (it)
ES (1) ES2235718T3 (it)
IT (1) IT1310094B1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010062321A1 (de) * 2010-12-02 2012-06-06 Elringklinger Ag Ölabscheidereinheit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10111241A1 (de) 2001-03-09 2002-09-12 Man Nutzfahrzeuge Ag Be- und Entlüftungsvorrichtung, spritzwassergeschützt, für Getriebegehäuse, vorzugsweise in Kraftfahrzeugen
KR100872624B1 (ko) * 2007-04-11 2008-12-09 현대자동차주식회사 블로우바이 가스의 오일 분리용 배플 플레이트
KR101317516B1 (ko) * 2012-08-29 2013-10-15 인지컨트롤스 주식회사 내연기관용 엔진오일 세퍼레이터
KR101314958B1 (ko) 2012-08-29 2013-10-04 인지컨트롤스 주식회사 내연기관용 엔진오일 세퍼레이터
CH717661A1 (de) * 2020-07-15 2022-01-31 Liebherr Machines Bulle Sa Aerosolseparator zum Abscheiden von Aerosolen in einem Blow-by-Gas.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685635A1 (de) * 1994-05-02 1995-12-06 Ing. Walter Hengst GmbH & Co. KG Kurbelgehäuseentlüftung für eine Brennkraftmaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1255642A (en) * 1968-01-23 1971-12-01 Perkins Engines Ltd Improvements in or relating to crankcase breathers for internal combustion engines
US4470389A (en) * 1982-02-08 1984-09-11 Kawasaki Jukogyo Kabushiki Kaisha Breather-lubricator system for engines
JPS60153806A (ja) * 1984-01-20 1985-08-13 松下電工株式会社 ヘア−ドライヤ−
DE3832870A1 (de) * 1988-09-28 1990-03-29 Bayer Ag (kontinuierliche) herstellung von acrylnitrilfaeden und -fasern aus restloesungsmittelarmem spinngut
US4926814A (en) * 1989-07-12 1990-05-22 Tecumseh Products Company Crankcase breather and lubrication oil system for an internal combustion engine
US5067449A (en) * 1991-04-12 1991-11-26 Tecumseh Products Company Fitted crankcase breather valve assembly
US5239972A (en) * 1992-03-24 1993-08-31 Nippon Soken, Inc. Gas/liquid separation device
US5205243A (en) * 1992-03-26 1993-04-27 Tecumseh Products Company Crankcase breather having a fitted retainer for retaining a valved cup assembly
IT1285385B1 (it) * 1996-05-31 1998-06-03 Iveco Fiat Motore endotermico provvisto di un dispositivo di depurazione dei gas di sfiato del basamento.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685635A1 (de) * 1994-05-02 1995-12-06 Ing. Walter Hengst GmbH & Co. KG Kurbelgehäuseentlüftung für eine Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010062321A1 (de) * 2010-12-02 2012-06-06 Elringklinger Ag Ölabscheidereinheit
DE102010062321B4 (de) 2010-12-02 2023-10-12 Elringklinger Ag Ölabscheidereinheit

Also Published As

Publication number Publication date
DE60017986D1 (de) 2005-03-17
IT1310094B1 (it) 2002-02-11
JP2001065327A (ja) 2001-03-13
ES2235718T3 (es) 2005-07-16
DE60017986T2 (de) 2006-01-19
ITTO990605A1 (it) 2001-01-09
ATE288999T1 (de) 2005-02-15
EP1067276A1 (en) 2001-01-10

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