EP1880085A1 - In eine axial hohle welle eines verbrennungsmotors integrierte zentrifugal-ölnebelabscheidereinrichtung - Google Patents
In eine axial hohle welle eines verbrennungsmotors integrierte zentrifugal-ölnebelabscheidereinrichtungInfo
- Publication number
- EP1880085A1 EP1880085A1 EP06722839A EP06722839A EP1880085A1 EP 1880085 A1 EP1880085 A1 EP 1880085A1 EP 06722839 A EP06722839 A EP 06722839A EP 06722839 A EP06722839 A EP 06722839A EP 1880085 A1 EP1880085 A1 EP 1880085A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil mist
- separator
- oil
- camshaft
- shaft
- 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
Links
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/02—Lubrication
-
- 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
- F01M2013/0422—Separating oil and gas with a centrifuge device
Definitions
- Centrifugal oil mist separator integrated in an axially hollow shaft of an internal combustion engine
- the invention relates to a, in an axially hollow, in particular a camshaft, an internal combustion engine integrated Zentrifugal- ⁇ lnebelabscheider founded.
- an axially hollow camshaft which is provided at one end with a ⁇ labscheider founded located circumferentially outside the camshaft.
- This oil separator consists of a first annular channel with an annular gap which is radially inwardly open at one of its axial ends and a radially substantially closed annular channel wall which is axially opposite this annular gap. Substantially closed means that this wall is provided with axial openings.
- the abovementioned axial openings are in fluid communication with the axial cavity of the camshaft via radial openings in the circumferential wall of the camshaft.
- the first annular channel provided with a radially inner, axial opening gap is located in the latter outer circumferential surface provided, leading radially outward oil drainage holes.
- Oil mist is sucked by a pressure applied to the cavity of the camshaft vacuum through the radially inner, axial gap of the first annular channel.
- a liquid fraction contained in the oil mist flows radially outwards due to centrifugal forces and leaves this annular channel through the drainage openings leading radially outward there.
- a usually remaining proportion of the oil mist stream passes through the axial openings in the radially substantially closed wall of the first annular channel via the second annular channel in the cavity of the camshaft, from where this gas stream leaves the camshaft axially.
- An oil separation within the axial cavity of the camshaft is not provided in that device.
- a hollow camshaft with an integrated oil mist separator is known in which the oil separation takes place within the cavity of the camshaft.
- the oil mist stream enters the cavity through a swirl generator at one axial end of the camshaft and exits the camshaft at an opposite end.
- a dip tube engages axially into the interior of the cavity of the camshaft to from there after remaining the separation of the liquid phase Dissipate gas stream.
- the liquid fraction separated from the oil mist stream also leaves the camshaft at this opposite end via an annular gap between the aforementioned dip tube and the inner wall of the camshaft cavity.
- US 4,651,705 discloses a hollow camshaft in which oil separation occurs centrifugally within the camshaft cavity.
- radial bores are provided over the length distributed.
- liquid oil also leaves the camshaft cavity via radial bores, also with a distribution of these bores over the length of the camshaft.
- the camshaft cavity is provided with a profiled inner circumferential surface such that those radial bores that lead oil mist radially inward, lie in inner wall areas with a smaller diameter than those radial bores, from which oil is discharged radially outward.
- the portion of the oil mist stream which remains after liquid separation leaves the camshaft cavity at one axial end of the camshaft via a throttle opening provided there.
- this device is missing a centrifugal pre-separator outside the cavity of the camshaft on the one hand and on the other hand, no swirl generator for the there flowing through the oil mist stream is provided in this device in the cavity of the camshaft.
- the oil separation takes place from an oil mist in an oil mist pre-separator in an outer circumferential region of the camshaft.
- the oil mist pre-separator operates on a similar principle as that according to DE 102 26 695 Al.
- the cavity of the camshaft serves only for a discharge of that part of the oil mist stream introduced into the pre-separator which is freed of liquid fractions separated in the pre-separator.
- the invention is primarily concerned with the problem of improving the effectiveness of a Zentrifugal- ⁇ lnebelabscheider situated in an axially hollow shaft of an internal combustion engine over the previously known prior art.
- the invention is based on the general idea to provide a centrifugal oil mist separator with an integration in a hollow shaft of an internal combustion engine, in which a pre-separation in an outer region firmly connected to the shaft with a Nachgezie- The final separation within the wave cavity is combined.
- the pre-separator serves to separate the liquid oil fraction, which is present in relatively large oil droplets, while the fine oil mist droplets are deposited in the region of the final separation.
- a swirl is imposed on the oil mist stream within the wave cavity by means of a swirl generator.
- the swirl generator is located in an axial region of the shaft cavity of the ⁇ lnebeleintrittsbe 1 "I is relatively closely adjacent. Downstream of the swirl generator is to be a flow length exist, the possible approximately equal to ten times the flow cross-section, in which the swirl generator within the shaft cavity located.
- an axial force component sets up which promotes separated oil in the direction of the wide end of the conical jacket.
- This conveying effect can be enhanced by a corresponding, screw conveyor-like design of the inner surface of the conical jacket.
- the screw conveyor windings are to be aligned such that during a rotation of the shaft. indeed, a corresponding promotion effect can occur.
- a radial discharge channel is provided according to the invention for draining liquid oil deposited by gravity. From this drainage channel can this oil only emerge in the open state of a provided within this channel closure valve.
- This closure valve is advantageously designed as a gravity valve that can automatically open under gravity accumulated oil. By means of such a gravity valve, separated oil is not discharged continuously but discontinuously, namely whenever sufficient separated liquid oil has accumulated to open the gravity valve.
- Another problem with which the invention is concerned is to form an oil mist separator of a motor vehicle internal combustion engine as simple as possible with a simultaneously good efficiency as an axial cyclone. This problem is solved essentially already by an embodiment of such an axial cyclone according to patent claim 7.
- This aspect of the invention is based on the general idea of providing an axial cyclone completely free of integration from other functional elements in or on the internal combustion engine in a region which offers sufficient space for this purpose.
- This area can basically be inside or outside the motor housing.
- Within the motor housing means in the aforementioned sense within a space acted upon by the crankcase gases, in which the oil mist is present, which is sealed to the outside.
- the Axialzyklon as ⁇ lnebelabscheider consists essentially only of a tubular Abscheidegereheatuse, which is a simple tube in the simplest case, which is mounted as low-friction as possible within the engine stationary.
- the drive of the tubular Abscheidegepuruses with which this can be set in rotation for a Abscheidungs superb, both by a stand-alone, for example designed as an electric motor drive or by the shared use of a drive for other functional elements.
- tubular separator housing When using a separate electric motor, the tubular separator housing may be part of the electric motor by this forms the rotor of such an engine.
- tubular separator housing is driven exclusively by the oil mist stream flowing through this housing. It is driven by the swirl generator mounted inside the • tubular separator housing, which converts the flow energy of the oil mist stream into rotational energy.
- the pressure gradient within the separation housing may optionally be increased by the use of a pump.
- oil mist separator are known from DE 103 38 770 Al (cyclone separator with rotating deposition plates within a co-rotating housing), US 3,561,195 A (paddle wheel rotor with axial flow deflection by 180 °), DE 199 14 166 Al Centrifuge without rotating outer housing), DE 100 63 903 A1 (centrifuge without rotating outer housing), DE 35 41 204 A1 (centrifuge without rotating outer housing), US Pat. No. 4,189,310 (centrifuge without appreciable axial flow), US Pat. No.
- FIG. 1 shows a longitudinal section through an attached outside of a motor housing axial cyclone
- FIG 3 shows a longitudinal section through an oil mist separator integrated into a camshaft of an internal combustion engine.
- the core of the oil gag separator formed as an axial cyclone consists of a tube-shaped separator housing 1 bearing a shaft.
- the bearings 2 are mounted in thrust-resistant abutments via bearings 2 with the least possible friction.
- a feed channel 3 guides an oil mist flow axially into the interior of the tubular separator housing 1.
- the feed channel 3 engages circumferentially with an extremely small clearance in the interior of the tubular AbscheidegePSu- Ses 1, which may already be given a sufficient seal when there is sufficient negative pressure relative to the atmosphere during operation of Axialzyklones in its interior.
- the tubular separator housing 1 engages with its outer circumference in a funnel-shaped receiving space 4, which is motor-fixed. In the region in which the tubular separator housing 1 engages in the receiving space 4, it is mounted on the outer wall via one of the bearings 2.
- This bearing 2 can be designed as an at least largely sealing bearing, whereby the interior of the receiving space 4 can already be sufficiently sealed relative to the atmosphere.
- a discharge channel 5 Axially in alignment with the tubular separator housing 1 leads from the receiving space 4, a discharge channel 5.
- a swirl generator 6 Within the tubular separator housing 1 is a swirl generator 6. When operating the Axialzyklones this rotates and is traversed by oil mist in the direction of the feed channel 3 to the discharge channel 5. Deposited oil droplets sink gravitationally in the receiving space 4 down and can escape through a drain opening 7 from this.
- a drive element for the tubular separating vessel 1, by which it is set in rotation, is not entered in the drawing, which is intended to illustrate the device only schematically.
- a separate drive can be dispensed with if the flow gie of the oil mist stream is sufficient to drive the tubular separator housing 1 via the swirl generator 6.
- sufficient flow energy can also be generated through the use of a pump for conveying the oil mist through the axial cyclone.
- An axial cyclone in the embodiment according to FIG. 1 can be provided, for example, in a cover hood of an internal combustion engine.
- almost all parts of the axial cyclone according to the invention can be economically producible plastic parts.
- the abutment and connections for the axial cyclone can be rationally integrated into elements of the engine, which are made in particular of plastic.
- the axial cyclone of FIG. 2 is housed within a motor housing 14.
- the basic structure of this Axialzyklons corresponds to that according to the embodiment in Fig. 1. Functionally identical elements are therefore assigned the same reference numerals.
- a pre-separator 8 is provided on the inflow side. Within this pre-separator 8, the construction of which is explained in more ⁇ forth nä, radial supply ports 9 are located in the interior of the tubular separator housing. 1
- the pre-separator 8 is formed by a funnel 10 which coaxially surrounds the tubular separator housing 1 in the form of a conical jacket in the region of the feed openings 9.
- the conical jacket of the funnel 10 has an axially closed and an axially open end, wherein the closed end is at its narrow and the open end at its wide opening cross-section.
- the swirl generator 6 In the cavity of the tubular separation housing 1, the swirl generator 6 is provided with a relatively small axial distance to the supply openings 9.
- This swirl generator 6 has, as in the embodiment of FIG. 1, in the description of which is not discussed here, the task to put the cavity of the tubular Abscheidegepuruses flowing oil mist stream in a swirl flow to thereby downstream of the swirl generator 6 separated a deposit, liquid oil can be achieved on the inner wall of the tubular separator housing 1 to a particularly high degree.
- the resultant by such an attachment oil film is indicated in the drawing with near-wall flow arrows.
- the at least largely freed from liquid oil fractions, gaseous portion of the oil mist stream is exposed downstream of the swirl generator 6 by bold flow arrows.
- the inner lateral surface of the conical jacket of the funnel 10 is in particular designed like a screw conveyor, specifically in a region which is outlined in the drawing by a dot-dash line 11 in each case.
- the oil mist stream is rotated by the rotating tubular separator housing 1 with which the conical jacket is fixed, before this oil mist stream flows into the radial feed openings 9 into the interior of the tubular separation housing 1 passes.
- Due to the conical or funnel-shaped course of the conical jacket an axial force component in the direction of the axially open end of the conical jacket arises in the oil deposited on the inner wall of the conical jacket by centrifugal forces as an oil film.
- This axial component results from the fact that the centrifugal force increases with increasing inner diameter of the inner surface of the conical jacket, resulting in a positive centrifugal force gradient towards the open end of the conical jacket.
- This gradient results in an axial force component toward the open end of the conical shell which drives oil deposited on the inner circumference of the conical shell toward the axially open end from which it can flow.
- the conical jacket fulfills the function of a pre-separator 8.
- the main separation takes place in the cavity of the tubular separator housing 1.
- the oil mist stream entering the cavity through the radial feed openings 9 becomes generator through the axially relatively nearby to these openings 9 in the hollow space of the tubular separator 1 twister ⁇ 6 set in swirl.
- liquid oil components within the oil mist stream can settle particularly effectively as an oil film on the inner wall of the cavity of the tubular separator housing 1.
- a flow of the oil mist through the conical jacket as a pre-separator 8 and the cavity within the tubular separator housing 1 is generated by a negative pressure, which is exposed to the cavity of the tubular Abscheidegephaseuses.
- the discharge channel 5 is arranged axially aligned with respect to the axis of the tubular separation housing 1. It has an axial distance relative to the tubular separator housing 1, since a receiving space 4 is provided between it and the end of the tubular separator housing 1.
- a funnel region 12 projects into the receiving region 4 from the end of the tubular separator housing 1.
- a flow-ring channel 13 exists between the outer circumference of this funnel region 12 and an approximately complementary outer wall of the receiving region 4.
- This flow-channel 13 opens in the region of the narrow end of the funnel region 12 to the outside in the of the Mo-
- corresponding flow-guiding means 16 are provided on the outer circumference of the funnel region 12.
- any required drive means for the tubular separator housing 1 are not shown in the drawing.
- the rotational energy for the tubular separator housing 1 may possibly be applied in sufficient form by the oil mist stream itself and reacted in the swirl generator.
- An axially hollow camshaft 101 with a cavity 102 is rotatably mounted in a camshaft housing 103.
- the bearings of the camshaft are indicated by 104.
- the camshaft 101 is driven via a sprocket 105 located outside the camshaft housing 103.
- An oil mist stream, to be separated from the oil as the liquid phase is indicated by arrows A.
- the oil mist stream to be separated enters the cavity 102 of the camshaft 101 through oil mist supply openings 106 provided in the wall of the camshaft 101.
- a hopper surrounds coaxially with the axis of the camshaft 101 the conical shell 107 has an axially closed and an axially open end, wherein the closed end is at its narrow and the open end at its wide opening cross-section.
- a swirl generator 108 is provided at a relatively small axial distance to the oil mist supply openings 106.
- This swirl generator 108 has the task to put the cavity 102 of the camshaft 101 flowing through the oil mist stream in a swirl flow to thereby downstream of the swirl generator 108 can accumulate a separated, liquid oil on the inner wall of the camshaft 101 to achieve a particularly high degree.
- the resultant by such an attachment oil film is indicated in the drawing with dashed lines 109.
- the at least largely freed from liquid oil fractions gaseous fraction of the oil mist stream is indicated downstream of the swirl generator 108 with arrows 10.
- the inner lateral surface of the conical jacket 107 is designed like a screw conveyor, namely in a region which is outlined in the drawing by a dot-dash line 111 in each case.
- the oil mist stream is rotated by the rotating camshaft 101, to which the conical shell 107 is fixed, before this oil mist stream enters the radial oil supply ports 106 of the camshaft 101.
- an axial force component in the direction of the axially open end of the conical shell 107 is formed in the oil separated by centrifugal forces as oil film on the inner wall of the conical shell 107.
- This axial component results from the fact that the centrifugal force increases with increasing inner diameter of the inner surface of the conical shell 107 conical shell 107, resulting in a positive centrifugal force gradient towards the open end of the conical shell.
- This gradient in turn leads to an axial component of force in the direction of the open end of the conical shell 107, which drives oil deposited on the inner circumference of the conical jacket to the axially open end, from where it can flow off radially in accordance with the arrows B.
- the conical jacket 107 fulfills the function of a pre-separator.
- a flow of the oil mist through the conical jacket as a pre-separator and the cavity 102 of the camshaft 102nd is generated by a negative pressure, the cavity 102 of the camshaft 101 is exposed.
- the gas discharge channel 113 is arranged axially aligned with respect to the axis of the camshaft 101, namely abutting the respective end face of the camshaft 101.
- the gas discharge passage 113 does not protrude like a dip tube into the cavity 102 of the camshaft 101.
- the opening area of the gas discharge passage 113 may be identical to that of the cavity 102 of the camshaft 101.
- the oil discharge passage 112 is formed adjacent to the respective end of the camshaft 101 as an annular passage surrounding the gas discharge passage 113, through which separated liquid oil can flow.
- the annular region of the oil discharge channel 112 merges into an approximately tubular channel section into which separated liquid oil can flow off due to gravity. From this area, the separated, liquid oil can flow into the crank chamber of an internal combustion engine containing the camshaft 102. Since there is a pressure gradient in the direction of the cavity 102 of the camshaft 101 between the cavity 102 of the camshaft 101, on the one hand, and the crank chamber, on the other hand, a so-called gravity valve 117 can be provided in the oil discharge passage 112 be arranged.
- Gravity valve is here understood to mean a closing valve 117 which is opened by the weight of the liquid oil accumulating upstream of the valve.
- the swirl generator 108 can be easily inserted into the cavity 102 of the camshaft 101 for mounting.
- a fixing of the swirl generator 108 can be carried out by, for example, a double-sided caulking with material from the inner wall of the camshaft 102.
- only one Stemmwerkmaschine must be inserted axially into the cavity, on both sides of the camshaft 101, when the swirl generator 102 is to be caulked to both sides axially.
- the caulked areas are entered in the drawing with 114.
- the 'gas discharge channel 113 is fixedly connected to the camshaft housing 103rd
- the interior of the camshaft housing 103 is in the region of the oil discharge channel 103 compared to the sem within a neighboring bearing 104 sealed by a ring seal 116.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Centrifugal Separators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510022254 DE102005022254A1 (de) | 2005-05-10 | 2005-05-10 | In eine axial hohle Nockenwelle eines Verbrennungsmotors integrierte Zentrifugal-Ölnebelabscheidereinrichtung |
DE102005042725A DE102005042725A1 (de) | 2004-09-23 | 2005-09-08 | Axialzyklon als Ölnebelabscheider eines Kraftfahrzeug-Verbrennungsmotors |
PCT/DE2006/000781 WO2006119737A1 (de) | 2005-05-10 | 2006-05-06 | In eine axial hohle welle eines verbrennungsmotors integrierte zentrifugal-ölnebelabscheidereinrichtung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1880085A1 true EP1880085A1 (de) | 2008-01-23 |
EP1880085B1 EP1880085B1 (de) | 2010-08-11 |
EP1880085B2 EP1880085B2 (de) | 2013-10-09 |
Family
ID=37000109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06722839.5A Expired - Fee Related EP1880085B2 (de) | 2005-05-10 | 2006-05-06 | In eine axial hohle welle eines verbrennungsmotors integrierte zentrifugal-ölnebelabscheidereinrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US7717101B2 (de) |
EP (1) | EP1880085B2 (de) |
JP (1) | JP5124448B2 (de) |
DE (2) | DE112006000356A5 (de) |
WO (1) | WO2006119737A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1845238A2 (de) | 2006-03-20 | 2007-10-17 | Mahle International GmbH | Zylinderkopf eines Verbrennungsmotors |
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- 2006-05-06 JP JP2008510397A patent/JP5124448B2/ja not_active Expired - Fee Related
- 2006-05-06 EP EP06722839.5A patent/EP1880085B2/de not_active Expired - Fee Related
- 2006-05-06 US US11/660,831 patent/US7717101B2/en not_active Expired - Fee Related
- 2006-05-06 DE DE112006000356T patent/DE112006000356A5/de not_active Withdrawn
- 2006-05-06 WO PCT/DE2006/000781 patent/WO2006119737A1/de not_active Application Discontinuation
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EP1845238A2 (de) | 2006-03-20 | 2007-10-17 | Mahle International GmbH | Zylinderkopf eines Verbrennungsmotors |
EP1845238A3 (de) * | 2006-03-20 | 2009-10-21 | Mahle International GmbH | Zylinderkopf eines Verbrennungsmotors |
Also Published As
Publication number | Publication date |
---|---|
US20070294986A1 (en) | 2007-12-27 |
EP1880085B1 (de) | 2010-08-11 |
EP1880085B2 (de) | 2013-10-09 |
US7717101B2 (en) | 2010-05-18 |
JP5124448B2 (ja) | 2013-01-23 |
JP2008540906A (ja) | 2008-11-20 |
WO2006119737A1 (de) | 2006-11-16 |
DE502006007644D1 (de) | 2010-09-23 |
DE112006000356A5 (de) | 2007-11-22 |
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