EP0348743A2 - Ventilation du carter pour un moteur à combustion interne - Google Patents

Ventilation du carter pour un moteur à combustion interne Download PDF

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Publication number
EP0348743A2
EP0348743A2 EP89110843A EP89110843A EP0348743A2 EP 0348743 A2 EP0348743 A2 EP 0348743A2 EP 89110843 A EP89110843 A EP 89110843A EP 89110843 A EP89110843 A EP 89110843A EP 0348743 A2 EP0348743 A2 EP 0348743A2
Authority
EP
European Patent Office
Prior art keywords
crankcase ventilation
leg
combustion engine
inner tube
piece
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
EP89110843A
Other languages
German (de)
English (en)
Other versions
EP0348743A3 (en
EP0348743B1 (fr
Inventor
Michael Pleschberger
Gerhardt Waldmann
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0348743A2 publication Critical patent/EP0348743A2/fr
Publication of EP0348743A3 publication Critical patent/EP0348743A3/de
Application granted granted Critical
Publication of EP0348743B1 publication Critical patent/EP0348743B1/fr
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
    • F01M13/0405—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in covering members apertures, e.g. caps
    • 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
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
    • F01M13/025—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction with an inlet-conduit via an air-filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/006—Camshaft or pushrod housings

Definitions

  • the invention relates to a crankcase ventilation according to the preamble of claim 1 and is based on the generic DE-C 36 25 376th
  • Crankcase ventilation systems lead the so-called blow-by gases, which get from the combustion chambers into the crankcase or machine housing of the internal combustion engine, back into the intake tract of the internal combustion engine.
  • blow-by gases By specifically coordinating the cross-section of the return line or also by arranging regulating valves, a small negative pressure is usually always generated in the crankcase in order to prevent the harmful blow-by gases from escaping unburned into the environment and thereby, for example, a radial shaft sealing ring or similar components damage.
  • the return line is usually provided with a labyrinth-shaped liquid separator. So here there is a separation between the pure, easily combustible gas component and a liquid component, which is returned to the oil circuit of the internal combustion engine.
  • the object of the invention is to demonstrate an always effective crankcase ventilation, which is characterized by simple components and the simplest manufacturing and assembly options. This object is achieved by the characterizing features of the first claim, advantageous embodiments and further developments describe the subclaims.
  • a liquid separator is integrated into the coupling tube piece connecting the return line to an intake line part of the internal combustion engine. Both oil vapors and condensate residues are thus safely retained in all circumstances in the simplest way. If the intake pipe part geodetically higher than the connection point of the return line on the crankcase, the liquid portion separated in the coupling tube piece can be easily returned to the crankcase via the return line. Alternatively, the separated liquid portion can be carried along in the return line by an air flow directed from the intake tract to the machine housing. Such flows, which change in the direction, in the return line can be found in crankcase ventilation systems which have both a so-called primary ventilation and a so-called secondary ventilation.
  • the primary vent opens into the intake tract downstream of a throttle element, and the secondary vent opens upstream of the throttle element.
  • the vacuum is so high that a certain air flow is withdrawn from the intake duct via the return line. This air flow is suitable for returning the liquid portion that accumulates in the liquid separator designed according to the invention into the machine housing.
  • Such a coupling tube piece can be easily manufactured if it is constructed in accordance with the features specified in the characterizing part of the first claim from at least two individual parts, which can be produced, for example, by plastic injection molding.
  • the collar closing the annular gap between the inner tube and the first leg ensures that the blow-by gases are guided through the inner tube.
  • the transition opening in the wall of the inner tube is advantageously designed as a flow separation gap in order to further improve the liquid-separating effect.
  • the features of the fourth claim advantageously allow the inner tube to be connected gas-tight to the first leg of the outer part. According to the invention, no separate operation is required for this either, rather that connection is made solely by assembling the coupling tube piece with the corresponding line part, which can be both the intake line part of the internal combustion engine and the return line itself without influencing the function of the crankcase ventilation according to the invention.
  • crankcase ventilation system can be further improved if, according to claim 5, the end of the return line facing away from the coupling pipe piece is connected to the crankcase or machine housing via a connecting piece which consists of two separate branches consists.
  • double-flow crankcase ventilation systems are per se state of the art.
  • Either a main ventilation system and a safety ventilation system are provided, as in the generic document, or the crankcase ventilation system consists, as already explained above, of a so-called primary ventilation and a secondary ventilation, which flow downstream or upstream of a throttle element in the intake tract of the internal combustion engine flow out.
  • connection sockets on the crankcase or machine housing for these two ventilation systems, or to arrange a common return line for only one connection socket, which ends in a separate branching part, from which the two ventilation systems separate to be continued.
  • connection sockets on the crankcase or machine housing for these two ventilation systems
  • common return line for only one connection socket, which ends in a separate branching part, from which the two ventilation systems separate to be continued.
  • connection piece at a single opening of the machine housing, which is provided with two adjacent branches for the double-flow crankcase ventilation system.
  • one of the two branches of the connecting piece projects into the interior of the machine housing with a tubular extension, while the other branch opens near the inner wall of the machine housing.
  • the two crankcase ventilation systems primary ventilation and secondary ventilation
  • the space between the mouth regions of the two branches acts as a damping volume in the function of the crankcase according to the invention. Ventilation system is integrated. A short-circuit flow between the two branches is thus avoided; the damping volume prevents the transmission of pressure peaks.
  • the two branches are further decoupled when, according to claim 7, the tubular extension penetrates an oil separator provided for the other branch.
  • the liquid separation for the branch with the tubular extension is carried out solely by the separator provided in the coupling pipe section of the intake tract.
  • crankcase ventilation system as well as in detail the coupling pipe piece and the connector on the machine housing.
  • An internal combustion engine shown only schematically, designated in its entirety by 1, consists of a crankcase 2, a cylinder head 3 with a cylinder head cover 6, and an intake tract 4, in which a throttle valve 5 is arranged.
  • the intake tract 4 leads into a suction channel 8 in the cylinder head 3, which in turn opens into a combustion chamber 10.
  • blow-by gases emerging from the combustion chamber 10 into the crankcase 2 enter the cylinder head 3 and are fed from there to the intake tract 4.
  • the cross sections of the two Return lines 7 and 9 are matched to one another so that when the throttle valve 5 is wide open and thus a high load point of the internal combustion engine, in which a relatively large volume flow of blow-by gases also occurs, this return line is maintained via both return lines while maintaining the desired pressure level in the crankcase 2 7, 9 is guided into the intake tract 4.
  • the blow-by gases collecting in the crankcase 2 are interspersed with lubricating oil and condensate liquid. These liquids have to be separated, since entrained lubricating oil would drastically increase the oil consumption of the internal combustion engine and condensate residues in the intake tract 4 could cause ice formation in cold weather, especially in the area of the throttle valve. Furthermore, when the internal combustion engine comes to a standstill, oil vapors entering the intake tract could damage an auxiliary wire air mass meter provided there during its free-heating phase.
  • an oil separator 51 is arranged under the cylinder head cover 6 for separating the essential lubricating oil portion.
  • certain amounts of residual oil are also contained in the blow-by gases flowing through the return lines 7 and 9.
  • the blow-by gases cool significantly, in particular in the return line 9, which is significantly longer than the return line 7 from, so that there can be pronounced condensate formation in the mouth of the return line 9 in the intake tract 4.
  • the coupling tube piece 11 consists of an angular outer part 15 and an inner tube 17.
  • the outer part 15 has a first leg 19 and a second leg 20, which enclose between them a so-called angular region 21 which is spherical on the inside.
  • the inner tube 17 is inserted into the first leg 19.
  • spacer webs 23 and a positioning lug 25 are provided for this purpose, which latches into a corresponding recess in the leg 19 of the coupling tube piece 11.
  • the annular gap located between the inner tube 17 and the leg 19 in the region of the spacer webs is closed by a collar 27 provided on the inner tube and resting on the free end of the leg 19 in the fully assembled state.
  • This collar 27 is supported on a correspondingly designed shoulder 29 of the bead 31 of the receiving opening 33 of the intake duct part 13 which receives the first leg 19.
  • the return line 9 is plugged onto the second leg 20.
  • the inner tube 17 has a closed end in the angular region 21.
  • the wall of the inner tube 17 is provided with a transition opening 35 designed as a flow separation gap.
  • the second leg 20 forms a tube piece, the mouth opening of which lies in the angular range within the projection of the inner tube 17 which is extended in the axial direction.
  • This arrangement represents for the gases flowing through the coupling tube piece 11 represent a liquid-secreting labyrinth.
  • the stall gap acts as a support.
  • the flow in the direction of the intake duct part is shown by arrows.
  • the condensate which is deposited collects in the angular range 21 and is returned to the cylinder head 3 by the return flow explained above and prevailing under certain boundary conditions from the intake line part 13 via the coupling tube piece 11 and the equalizing return line 9.
  • the coupling tube piece 11 shown is characterized not only by high functionality, but also by low weight and simple manufacturing and assembly options.
  • the two individual parts (inner tube 17 and outer part 15) can be produced in a simple manner as plastic injection molded parts. Simply assembling it creates an effective liquid-secreting labyrinth.
  • a reliable seal between the inner tube 17 and the first leg 19 of the outer part 15 results in cooperation with the bead 31.
  • the invention proposes a common connector 40 for connecting the two return lines 7 and 9 to the cylinder head cover 6.
  • This is inserted with its circular plug-in area 42 into a correspondingly designed receiving bore in the cylinder head cover 6.
  • a crescent-shaped channel 44 is provided, which opens into a connecting piece 46, onto which the first return line 7 is pushed.
  • the crescent-shaped channel 44 and the connecting piece 46 thus form a first branch 47 of the connecting piece 40.
  • a second branch 49 is provided concentrically to the crescent-shaped channel 44, which likewise consists of a connecting piece 50 for the second equalization return line 9 and a tubular extension 52 projecting into the interior of the cylinder head 3.
  • This tubular extension 52 penetrates an oil separator 51 provided for the first branch 47 and shown only schematically.
  • the labyrinth provided in the coupling tube piece 11 thus acts as the only liquid separator for the second branch 49.
  • a damping volume is thus formed between the mouth opening of the tubular extension 52 and the mouth opening of the crescent-shaped channel 44 in the interior of the cylinder head 3, which dampens the flow in the case of rapid, operating, extreme pressure fluctuations in the crankcase 3.
  • the common connector 40 is characterized by a simplified assembly, since only a single connector 40 is required for connecting two return lines 7, 9.
  • crankcase ventilation system ensures high functionality, simple manufacture and assembly.
  • all of the features specified are essential to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
EP19890110843 1988-06-25 1989-06-15 Ventilation du carter pour un moteur à combustion interne Expired - Lifetime EP0348743B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821528A DE3821528C1 (fr) 1988-06-25 1988-06-25
DE3821528 1988-06-25

Publications (3)

Publication Number Publication Date
EP0348743A2 true EP0348743A2 (fr) 1990-01-03
EP0348743A3 EP0348743A3 (en) 1990-03-14
EP0348743B1 EP0348743B1 (fr) 1992-08-05

Family

ID=6357271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890110843 Expired - Lifetime EP0348743B1 (fr) 1988-06-25 1989-06-15 Ventilation du carter pour un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0348743B1 (fr)
DE (2) DE3821528C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736392A1 (fr) * 1995-07-07 1997-01-10 Renault Dispositif de reaspiration des gaz de carter d'un moteur a combustion interne
EP0777040A1 (fr) * 1995-12-01 1997-06-04 Chrysler Corporation Séparateur d'huile pour une système de ventilation de carter d'un moteur à combustion interne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918785A1 (de) * 1989-06-08 1990-12-13 Bayerische Motoren Werke Ag Sauganlage einer brennkraftmaschine
DE10310182B4 (de) * 2003-03-08 2008-11-13 Audi Ag Vorrichtung an einer Anschlussverbindung
DE102019209506A1 (de) * 2019-06-28 2020-12-31 Mahle International Gmbh Rohrkörper für eine Kurbelgehäuseentlüftungseinrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230669A (en) * 1941-02-04 Mixer fob internal combustion
US2311036A (en) * 1940-05-27 1943-02-16 Dick Wills Engine breather and ventilating system
US2818047A (en) * 1954-11-22 1957-12-31 Continental Motors Corp Centrifugal breather
DE1476040A1 (de) * 1965-09-17 1969-04-30 Drysdale William Robert Ventilationsanordnung zum Abfuehren von Daempfen
DE1576355A1 (de) * 1967-03-21 1970-04-09 Daimler Benz Ag Vorrichtung zum Entlueften des Gehaeuses von Einspritz-Brennkraftmaschinen
US4637367A (en) * 1984-02-28 1987-01-20 Nissan Motor Company, Limited Crankcase emission control system for an internal combustion engine
DE3625376C1 (de) * 1986-07-26 1987-10-29 Porsche Ag Kurbelgehaeuseentlueftung fuer Kraftfahrzeuge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736392A1 (fr) * 1995-07-07 1997-01-10 Renault Dispositif de reaspiration des gaz de carter d'un moteur a combustion interne
EP0777040A1 (fr) * 1995-12-01 1997-06-04 Chrysler Corporation Séparateur d'huile pour une système de ventilation de carter d'un moteur à combustion interne

Also Published As

Publication number Publication date
DE58901975D1 (de) 1992-09-10
EP0348743A3 (en) 1990-03-14
EP0348743B1 (fr) 1992-08-05
DE3821528C1 (fr) 1989-09-07

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