EP3009620A1 - Unité de séparation pour blow-by d'un moteur ic - Google Patents

Unité de séparation pour blow-by d'un moteur ic Download PDF

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Publication number
EP3009620A1
EP3009620A1 EP15190022.2A EP15190022A EP3009620A1 EP 3009620 A1 EP3009620 A1 EP 3009620A1 EP 15190022 A EP15190022 A EP 15190022A EP 3009620 A1 EP3009620 A1 EP 3009620A1
Authority
EP
European Patent Office
Prior art keywords
separation chamber
emissions
separation
frusto
engine
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Withdrawn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
EP15190022.2A
Other languages
German (de)
English (en)
Inventor
Pier Mario Cornaglia
Umberto Cornaglia
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.)
Officine Metallurgiche G Cornaglia SpA
Original Assignee
Officine Metallurgiche G Cornaglia SpA
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 Officine Metallurgiche G Cornaglia SpA filed Critical Officine Metallurgiche G Cornaglia SpA
Publication of EP3009620A1 publication Critical patent/EP3009620A1/fr
Withdrawn legal-status Critical Current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
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • 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
    • F01M2013/0038—Layout of crankcase breathing systems
    • F01M2013/005—Layout of crankcase breathing systems having one or more deoilers
    • F01M2013/0061—Layout of crankcase breathing systems having one or more deoilers having a plurality of deoilers
    • F01M2013/0072—Layout of crankcase breathing systems having one or more deoilers having a plurality of deoilers in series
    • 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
    • F01M2013/0433—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a deflection device, e.g. screen
    • 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
    • F01M2013/0438—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a filter
    • 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
    • F01M2013/0461—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a labyrinth
    • 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
    • F01M2013/0488—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with oil trap in the return conduit to the crankcase
    • F01M2013/0494—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with oil trap in the return conduit to the crankcase using check valves

Definitions

  • the invention relates to a separation unit for leakage emissions of an IC engine, especially, though not exclusively, of a motor vehicle.
  • IC engines with which motor vehicles are equipped generally comprise a crankcase housing the crankshaft and containing lubricating oil.
  • part of the exhaust gases leaks from the combustion chamber through the compression rings between pistons and cylinders and penetrates into the crankcase.
  • the leakage emissions commonly known within the field as blow-by gases or emissions, are returned to the combustion chamber through a duct connecting the crankcase of the engine to the manifold of the suction circuit.
  • the connection is usually effected downstream of the air filter and upstream of the turbine if existing.
  • a separation filter for preventing heavy hydrocarbons from being burnt off and consequently generating pollutant emissions.
  • separation devices of the inertial type are used.
  • a cartridge filter arranged in series may be further associated to the inertial separator.
  • An example of a separator of the known type is disclosed in WO2007129137 (A1 ).
  • Known separators and filters intended for the aforesaid purpose have a number of drawbacks.
  • a first drawback lies in the insufficient separation efficiency.
  • a second drawback consists in the manufacturing complexity.
  • a third drawback is the excessive size, which is often incompatible with the limited space available in the engine compartment.
  • a fourth drawback lies in the limited duration of the separation efficiency and in the consequent need for frequent replacement.
  • the separation unit for leakage emissions of an IC engine comprises a housing inside which a separation chamber is defined.
  • the housing preferably has a body with a squashed elongated or flat shape. This configuration advantageously allows to obtain a separation unit that is compact and easy to install in most IC engines, especially, though not exclusively, of motor vehicles.
  • the housing is provided with at least one inlet opening for allowing the entrance of oil-rich leakage emissions into the separation chamber, and at least one outlet opening for allowing the exit of purified, and therefore oil-poor or oil-free leakage emissions from the separation chamber.
  • the inlet opening is adapted to be communicated with the crankcase of an IC engine.
  • the outlet opening is adapted to be communicated with the suction circuit of the IC engine.
  • a first advantage of the invention derives from the high separation efficiency. This result is achieved especially by virtue of the fact that the separation chamber houses a separation device of the inertial type and a coalescence filter, said device and filter being arranged in series.
  • the coalescence filter may comprise a single-layer or multi-layer filtering mass of a suitable material.
  • the separation device is adapted to subject the flow of leakage emissions to accelerations due to direction changes and to separate by inertia the oil contained in the emissions passing through the separation chamber.
  • the coalescence filter is adapted to separate by coalescence the oil contained in the emissions passing through the separation chamber.
  • the separation device and the coalescence filter are arranged in the separation chamber so that the entire flow of leakage emissions passes at first through the separation device and then through the coalescence filter.
  • the separation device and the coalescence filter are preferably arranged in the chamber so as to define an inlet volume into which the at least one inlet opening opens and which is arranged upstream of the separation device, and an evacuation volume into which the outlet opening opens and which is arranged downstream of the filter.
  • the separation device and the filter are arranged in the separation chamber so as to be separated from each other along the longitudinal axis of the chamber housing them, and between the separation device and the coalescence filter there is provided a settling volume arranged downstream of the inertial separation device and upstream of the coalescence filter.
  • the settling volume is adapted to delay entrance of the flow of leakage emissions into the coalescence filter.
  • the settling volume is adapted to delay entrance of the flow of leakage emissions into the coalescence filter. This delay has the advantage of allowing the flow of emissions exiting the separation device to distribute homogeneously before entering the coalescence filter, thus improving the performance of the coalescence filter.
  • the separation device and the coalescence filter are associated to at least one corresponding drain valve for evacuating oil form the housing.
  • Further drain valves may be provided in the separation chamber for instance at the settling volume or at the evacuation volume.
  • the outlet opening is provided with a non-return valve adapted to allow evacuation of the oil-poor or oil-free leakage emissions from the separation chamber, when a predetermined threshold pressure is exceeded.
  • the housing of the separation unit according to the invention can be easily made of plastics by using the molding technique. Said housing may further be provided with holes and protrusions for fixing by means of nuts or bolts. This circumstance brings about the advantage of allowing to manufacture the separation unit in a cost-effective manner and in large numbers.
  • the separation unit for leakage emissions of an IC engine has been identified as a whole with reference numeral 11.
  • the unit 11 comprises a housing 13 defining at its inside a separation chamber 15.
  • the unit 11 comprises at least one inlet opening 17 for allowing the entrance of oil-rich leakage emissions into the separation chamber 15.
  • Each inlet opening 17 is adapted to be communicated with the crankcase of an IC engine.
  • the unit 11 further comprises at least one outlet opening 19 for allowing the exit of oil-poor or oil-free leakage emissions from the separation chamber 15.
  • the outlet opening 19 is adapted to be communicated with the suction circuit of the IC engine.
  • a separation device 21 of the inertial type is housed in the separation chamber 15.
  • the device 21 is housed in the separation chamber 15 so as to define an inlet volume 23 of the separation chamber 15 arranged upstream of the device 21.
  • the device 21 is adapted to subject the flow of leakage emissions to accelerations due to direction changes and to separate by inertia the oil contained in the emissions passing through the separation chamber 15.
  • a coalescence filter 25 is further housed in the separation chamber.
  • the filter 25 is housed in the separation chamber 15 upstream of the separation device 21.
  • the filter 25 is arranged in the chamber 15 so as to define an evacuation volume 27 of the separation chamber 15 arranged downstream of the filter.
  • the filter 25 is adapted to separate by coalescence the oil contained in the emissions passing through the separation chamber 15.
  • a settling volume 29 is further defined downstream of the inertial separation device 21 and upstream of the coalescence filter 25.
  • the settling volume 29 is adapted to delay entrance of the flow of leakage emissions into the coalescence filter 25.
  • the unit 11 comprises at least one first drain valve 31 associated to the inertial separation device 21 for evacuating from the chamber 15 the oil removed by the separation device 21.
  • the unit 11 further comprises at least one second drain valve 33 associated to the coalescence filter, in order to evacuate from the chamber 15 the oil removed by the filter.
  • said valve 33 is arranged in the evacuation volume 27.
  • a non-return valve 35 is arranged at the outlet opening 19. The valve 35 is adapted to allow evacuation of the oil-poor or oil-free leakage emissions from the separation chamber 15, when a predetermined threshold pressure is exceeded.
  • the housing 13 comprises an elongated body made of plastic material and having a substantially rectangular cross-section, in which the short side is at least half the length of the long side.
  • said elongated body is therefore squashed or flat and has remarkably reduced overall dimensions especially in its height.
  • the separation chamber 15 further develops longitudinally inside the housing 13 and preferably occupies substantially the whole available space.
  • the chamber 15 preferably further comprises an oval or elliptical cross-section with the major axis parallel to the long side of the substantially rectangular cross-section of the housing 13.
  • the housing 13 preferably comprises a pair of mutually perpendicular inlet openings 17 communicating with the inlet volume 23. Said opening are provided with a cylindrical extension 17a of the housing 13 defining a corresponding sleeve adapted to be associated to a corresponding opening, for instance one for each bank of valves, in the engine from which leakage emissions leak.
  • the drain valves 31 are membrane-like unidirectional check valves.
  • the valves 31 may be unidirectional umbrella-like check valves.
  • the drain valve 33 comprises a frusto-conical seat 33a provided with an inlet opening 33b and an outlet opening 33c and a ball 33d housed within the seat 33a and adapted to freely move between a closing position, proximal with respect to the inlet opening 33b, for closing the outlet opening 33c, and an opening position, distal with respect to the inlet opening 33b, for opening the outlet opening 33c.
  • the valves 31 and 33 can be all of the same kind or of different kinds.
  • the non-return valve 35 comprises a frusto-conical element 35a coaxially arranged inside the separation chamber 15 and with its perimetral edge 35b fixed to the inner wall of the chamber 15 and centrally open, and a second closing element 35c having the shape of a cylindrical or frusto-conical cup.
  • the cup 35c is pressed against the opening 35d of the frusto-conical element 35a by a coil spring 35e arranged between the perimetral edge 35f of the closing element 35c and an abutment seat 35g provided in the wall of the separation chamber 15.
  • the coalescence filter 25 comprises a toroidal cartridge having a coaxial support 25a and being held against the walls of the chamber 15 between a sleeve 25b housed in the settling volume 29 and the frusto-conical element 35a of the valve 35.
  • the separation device 21 comprises a first plurality 41a of opposite coaxial frusto-conical elements 43 partially inserted into one another which define a labyrinth path 45 for the emissions passing through the separation device 21, and a second plurality 41b of frusto-conical elements 43 arranged in a mirror-like manner adjacent and coaxial to those of the first plurality 41 a.
  • each plurality of frusto-conical elements 41a,41b comprises a first frusto-conical element 43 defining a corresponding trumpet 47 which is centrally open and has its perimetral edge 47a fixed to the inner wall of the separation chamber 15.
  • the trumpet 47 is arranged with its conicity tapering in the advancing direction of the flow of the leakage emissions.
  • Each plurality 41a,41b further comprises a second frusto-conical element 43 defining a trumpet 49 which is centrally open and has its perimetral edge 49a fixed to the inner wall of the separation chamber 15.
  • the trumpet 49 is arranged with its conicity tapering in the advancing direction of the flow of the leakage emissions.
  • the second trumpet is arranged around the first trumpet 47.
  • Each plurality 41a,41b further comprises a third frusto-conical element 43 defining a cup 51 with its conicity tapering in the direction opposite to the advancing direction of the flow of the leakage emissions, said cup being partially inserted between the first two trumpets 47,49.
  • a fourth frusto-conical element 43 defining a cup 53 with its conicity tapering in the direction opposite to the advancing direction of the flow of the leakage emissions, is partially inserted between the second trumpet 49 and the wall of the separation chamber 15.
  • the base of the cup 51 is fixed to the base of the cup 53 and located inside the latter.
  • the cup 53 is provided with circumferential openings 55 for the passage of the leakage emissions.
  • the housing 13 is further preferably provided with a perimetral fixing frame equipped with holes 61 for the passage of bolts 63 for fixing the unit 11 for instance to the cylinder head of an IC engine.
  • the separation unit as described and illustrated may undergo several variants especially in its height and modifications falling within the same inventive principle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
EP15190022.2A 2014-10-15 2015-10-15 Unité de séparation pour blow-by d'un moteur ic Withdrawn EP3009620A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20140840 2014-10-15

Publications (1)

Publication Number Publication Date
EP3009620A1 true EP3009620A1 (fr) 2016-04-20

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ID=52273408

Family Applications (1)

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EP15190022.2A Withdrawn EP3009620A1 (fr) 2014-10-15 2015-10-15 Unité de séparation pour blow-by d'un moteur ic

Country Status (1)

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EP (1) EP3009620A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3336325A1 (fr) * 2016-12-16 2018-06-20 Kubota Corporation Couvercle de culasse de moteur
CN109057915A (zh) * 2018-09-14 2018-12-21 广西玉柴机器股份有限公司 一种树状板气驱式发动机油气分离装置
CN109184854A (zh) * 2018-09-14 2019-01-11 广西玉柴机器股份有限公司 一种隔板气驱式自适应调压发动机油气分离装置
CN109209560A (zh) * 2018-09-14 2019-01-15 广西玉柴机器股份有限公司 一种滤网气驱式发动机油气分离装置
CN109595055A (zh) * 2018-12-17 2019-04-09 广西玉柴机器股份有限公司 一种具有树状板式自适应通风系统的天然气发动机
CN110005504A (zh) * 2019-03-22 2019-07-12 神通科技集团股份有限公司 一种油气分离器
WO2020253979A1 (fr) * 2019-06-19 2020-12-24 Deutz Aktiengesellschaft Soupape de retour d'huile pour système de ventilation du carter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020066424A1 (en) * 1999-09-01 2002-06-06 Fedorowicz Jeffrey A. Flat low profile diesel engine crankcase ventilation filter
DE10127817A1 (de) * 2001-06-07 2002-12-12 Bosch Gmbh Robert Ölabscheidevorrichtung für Kurbelgehäusegase einer Verbrennungskraftmaschine
WO2007129137A1 (fr) 2006-05-09 2007-11-15 Dayco Fluid Technologies S.P.A. Dispositif séparateur de gaz contournant le piston pour moteur à combustion interne d'un véhicule à moteur
GB2441404A (en) * 2006-08-30 2008-03-05 Perkins Engines Co Ltd Baffle arrangement for separating liquid oil from blow-by gas in an i.c. engine
DE102012211805A1 (de) * 2011-08-31 2013-02-28 Toyota Boshoku Kabushiki Kaisha Ölabscheider
EP2653678A1 (fr) * 2012-04-19 2013-10-23 Fiat Powertrain Technologies S.p.A. Dispositif de separation d'huile dans un systéme de recirculation de gaz de carter pour un moteur à combustion interne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020066424A1 (en) * 1999-09-01 2002-06-06 Fedorowicz Jeffrey A. Flat low profile diesel engine crankcase ventilation filter
DE10127817A1 (de) * 2001-06-07 2002-12-12 Bosch Gmbh Robert Ölabscheidevorrichtung für Kurbelgehäusegase einer Verbrennungskraftmaschine
WO2007129137A1 (fr) 2006-05-09 2007-11-15 Dayco Fluid Technologies S.P.A. Dispositif séparateur de gaz contournant le piston pour moteur à combustion interne d'un véhicule à moteur
GB2441404A (en) * 2006-08-30 2008-03-05 Perkins Engines Co Ltd Baffle arrangement for separating liquid oil from blow-by gas in an i.c. engine
DE102012211805A1 (de) * 2011-08-31 2013-02-28 Toyota Boshoku Kabushiki Kaisha Ölabscheider
EP2653678A1 (fr) * 2012-04-19 2013-10-23 Fiat Powertrain Technologies S.p.A. Dispositif de separation d'huile dans un systéme de recirculation de gaz de carter pour un moteur à combustion interne

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3336325A1 (fr) * 2016-12-16 2018-06-20 Kubota Corporation Couvercle de culasse de moteur
US10774704B2 (en) 2016-12-16 2020-09-15 Kubota Corporation Engine head cover
CN109057915A (zh) * 2018-09-14 2018-12-21 广西玉柴机器股份有限公司 一种树状板气驱式发动机油气分离装置
CN109184854A (zh) * 2018-09-14 2019-01-11 广西玉柴机器股份有限公司 一种隔板气驱式自适应调压发动机油气分离装置
CN109209560A (zh) * 2018-09-14 2019-01-15 广西玉柴机器股份有限公司 一种滤网气驱式发动机油气分离装置
CN109595055A (zh) * 2018-12-17 2019-04-09 广西玉柴机器股份有限公司 一种具有树状板式自适应通风系统的天然气发动机
CN110005504A (zh) * 2019-03-22 2019-07-12 神通科技集团股份有限公司 一种油气分离器
WO2020253979A1 (fr) * 2019-06-19 2020-12-24 Deutz Aktiengesellschaft Soupape de retour d'huile pour système de ventilation du carter
CN114008304A (zh) * 2019-06-19 2022-02-01 道依茨股份公司 用于曲轴箱通风系统的回油阀
US11927119B2 (en) 2019-06-19 2024-03-12 Deutz Aktiengesellschaft Oil return valve for a crankcase ventilation system
CN114008304B (zh) * 2019-06-19 2024-04-23 道依茨股份公司 用于曲轴箱通风系统的回油阀

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