EP1969208B1 - Schmiersystem und verbrennungsmotor mit solch einem system - Google Patents

Schmiersystem und verbrennungsmotor mit solch einem system Download PDF

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Publication number
EP1969208B1
EP1969208B1 EP05849094A EP05849094A EP1969208B1 EP 1969208 B1 EP1969208 B1 EP 1969208B1 EP 05849094 A EP05849094 A EP 05849094A EP 05849094 A EP05849094 A EP 05849094A EP 1969208 B1 EP1969208 B1 EP 1969208B1
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EP
European Patent Office
Prior art keywords
oil
pressure
circuit
lubrication system
line
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.)
Not-in-force
Application number
EP05849094A
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English (en)
French (fr)
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EP1969208A1 (de
Inventor
Marc Miettaux
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.)
Renault Trucks SAS
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Renault Trucks SAS
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Publication date
Application filed by Renault Trucks SAS filed Critical Renault Trucks SAS
Publication of EP1969208A1 publication Critical patent/EP1969208A1/de
Application granted granted Critical
Publication of EP1969208B1 publication Critical patent/EP1969208B1/de
Not-in-force legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/02Pressure lubrication using lubricating pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00Pressure lubrication
    • F01M1/12Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • F01M2001/123Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10 using two or more pumps

Definitions

  • This invention concerns a lubrication system for an internal combustion engine. It also concerns an internal combustion engine including such a system.
  • hydraulic subsystems on an internal combustion engine in order to drive some equipments providing specific functions.
  • Such hydraulic subsystems might comprise a valve actuation equipment or an hydraulically powered fuel injection system. Oil circulating in such subsystems must be clean in order to guarantee correct working of the corresponding equipments.
  • EP-A-0 811 765 It is also known from EP-A-0 811 765 to use a two-stage internal gear pump to feed different hydraulic circuits on an internal combustion engine. The flow rate in these circuits cannot be controlled independently.
  • US-A-4,721,185 discloses an oil container arrangement for vehicles where a lubricant- pump sucks oil from a sump and feeds transmission lubricating means, on the one side, and a container, on the other side. Another pump sucks oil from this reservoir in order to feed a hydraulic subsystem. Since the container is fed with oil coming from the main sump, oil in this container is not clean, so that there is a risk of malfunction of the hydraulic subsystem.
  • the invention aims at providing a lubrication system which is adapted to feed both an engine lubrication main system and a hydraulic subsystem, where the quality of the oil provided to the subsystem is optimized in order not to alter the working of the subsystem.
  • the invention concerns a lubrication system for an internal combustion engine which comprises a main circuit including a main pump which draws oil from a sump and feeds a main line providing oil to an engine lubrication main system and at least an auxiliary circuit including an auxiliary pump which feeds a hydraulic subsystem and including a dedicated oil filter as shown in JP-04228815 and US2004/112677 .
  • this lubrication system is characterized in that said auxiliary circuit comprises a return line which redirects oil from the hydraulic subsystem towards the entry zone of the auxiliary circuit, the auxiliary circuit is fed from the main circuit through a pressure regulating unit and in that the dedicated filter is adapted to filter all oil coming from the pressure regulating unit.
  • the pressure and the flow rate of the oil provided to the hydraulic subsystem via the auxiliary circuit can be efficiently controlled thanks to the pressure regulating unit and the dedicated filter. Since the filter is adapted to filter oil coming from the pressure regulating unit, all oil entering the auxiliary circuit can be filtered, which guarantees that oil in this auxiliary circuit remains clean, even if oil in the main circuit is charged with soot or other pollutants.
  • the lubrication system might incorporate one or several of the following features:
  • the invention also concerns an internal combustion engine which comprises at least the cylinder provided with a piston slidably movable in this cylinder and at least an hydraulic subsystem, this engine being characterized in that it includes a lubrication system as mentioned here-above.
  • Such an engine has a better workability than the engines of the prior art insofar as oil in the auxiliary circuit can be kept clean and at a relatively constant pressure, even if oil in the main circuit is polluted and has a varying pressure.
  • the hydraulic subsystem can be a camless valve driving system, an oil-driven fuel injection system or an oil driven braking system.
  • the lubrication system represented on figures 1 and 2 is adapted to be mounted onto an internal combustion engine 1 of a vehicle, e.g. a truck.
  • Engine 1 comprises a crankshaft 11 and several cylinders 12, only two cylinders being represented on figure 1 .
  • a piston 13 is slidably movable within each cylinder 12, between a top dead center position and a bottom dead center position.
  • a piston cooling jet 14 is provided for each cylinder 12 and adapted to direct a flow of oil towards its piston 13 as shown by arrows A 1 , in particular when this piston is near its bottom dead center position.
  • Each cylinder 12 is provided with an intake valve 15 and an exhaust valve 16, these valves being loaded towards their respective seats by springs 17 and hydraulically driven by hydraulic actuators 18. These actuators 18 are fed from a common ramp or reservoir 19.
  • the lubrication system 2 of engine 1 includes a main pump 21 which draws oil from a sump 22 via a strainer 23. Pump 21 supplies oil under pressure via a filter 24 to a main circuit 25 which includes a main line 251 which divides itself into two feeding lines 252 and 253.
  • the first feeding line 252 provides oil to the interface between crankshaft 11 and the corresponding bearings, one of which is represented on figure 1 with reference 11A.
  • Second feeding line 253 feeds the piston cooling jet 14.
  • Return lines 254 and 255 convey oil, respectively from the interface between crankshaft 11 and bearing 11A and from the bottom of the cylinders 12, back to the sump 22.
  • This interface 11/11A and the cooling jets 14 form a main lubrication system for engine 1.
  • oil is polluted with soot coming from deposits resulting resulting from fuel combustion. Oil may also be polluted with particles or debris coming from mechanical components wear. Therefore, oil redirected to sump 22 cannot be considered as clean.
  • a two-way pressure limiter 26 is provided on the downstream side of pump 21 and allows to re-direct a part of the oil coming out of pump 21 to sump 22 in case the pressure in an upstream line 256 of circuit 25 is above a predetermined value, namely P 1.
  • An auxiliary circuit 27 is used to feed ramp 19 and the associated actuators 18.
  • This circuit 27 is formed of a first line 271 which feeds ramp 19 and a return line 272 which re-direct oil from ramp 19 towards the entry zone of circuit 27.
  • a dedicated filter 273 is provided on line 271, upstream of a dedicated auxiliary pump 274 which feeds ramp 19.
  • Circuit 27 is fed with oil from a branch line 257 of circuit 25 via a pressure regulating unit 28 which is represented in more detail on figure 2 .
  • Unit 28 is connected, on its inlet or upstream side, to branch line 257 and, on its outlet or downstream side, to line 271.
  • Unit 28 comprises a one-way valve 281 and a two-way pressure limiter 282.
  • a connection line 283 connects the downstream side of valve 281 to the outlet of unit 28, that is to line 271.
  • a return line 284 branches off from line 283 and allows to re-direct some oil from circuit 27 to sump 22.
  • Pressure limiter 282 is mounted on return line 284.
  • Oil pressure level P 2 downstream of valve 281 and in the upstream part of line 284 is set via pressure limiter 282. This pressure level P 2 is set at a value higher than the value of P 1 .
  • unit 28 The function of unit 28 is to control the pressure of the oil supplied to ramp 19 through filter 273 with the constraint of limiting the quantity of oil drawn from sump 22 in order to avoid a fast clogging of filter 273 by excessive use of engine oil coming from main sump 22. Unit 28 allows to compensate the variations of oil flow rate needed to feed ramp 19, these variations being dependent on the actual working conditions of actuators 18.
  • oil circulates in a closed loop within auxiliary circuit 27. In particular, oil flowing in return line 272 is recycled towards line 271 in order to supply again tank 19, through filter 273 and pump 274.
  • the nominal filtration rating of filter 273 can be chosen small enough in order to stop particles of soot and other particles of the same size.
  • the mesh size of filter 273 is chosen to provide a filtration efficiency of 95% or more with particles of a size in the range from 3 to 5 ⁇ m.
  • the nominal filtration rating of filter 273 is smaller than the nominal filtration rating of filter 24 and any other filter in the main circuit 25.
  • These filters in circuit 25 have an efficiency of about 80% with particles of a size of 20 ⁇ m since soot particles, of a size smaller than 20 ⁇ m, might circulate in circuit 25 and since, if one were to use very fine filters in this circuit, these filters would rapidly clog.
  • connection line 283 rises to a level greater than P 2 which induces that pressure limiter 282 opens and oil in excess returns to sump 222 via line 284. This happens as long as pressure in line 283 is above pressure level P 2 .
  • unit 28 allows to control that pressure of oil provided to the first line 271 of circuit 27 is regulated at a value of about P 2 .
  • Unit 28 of this embodiment also include a one-way valve 281 1 and a pressure limiter 282, whereas a connection line 283 connects the downstream side of valve 281 to the first line of auxiliary circuit 27.
  • the pressure level P 2 set by pressure limiter 282 is higher than the pressure level set by the pressure limiter used to control the feeding pressure of the main circuit 25.
  • Unit 28 incudes an oil accumulator 285 connected to line 283 and where oil can be stored at a pressure substantially equal to P 2.
  • Accumulator 285 allows to limit the volume of oil sucked from main circuit 25 when more oil is needed in line 271 than available from line 272. In such a case, oil present in accumulator 285 flows in line 283 before valve 281 opens. If the quantity of oil in accumulator 285 is sufficient, valve 281 does not open and no polluted oil flows from circuit 25 to the dedicated filter of circuit 27, similar to filter 273 of the first embodiment. If the quantity of oil needed is greater than what is available from accumulator 285, pressure in line 283 drops below P 1 and valve 281 opens, as explained here-above for the first embodiment.
  • Unit 28 of this embodiment includes a one-way valve 281 and a pressure limiter 282 mounted on a return line 284 which branches off a connection line 283 connecting the downstream side of valve 281 to the outlet of unit 28 which is connected to the first line of the auxiliary circuit 27.
  • the operational pressure of pressure limiter 282 is controlled by the actual pressure of oil in branch line 257.
  • a pilot line 286 connects branch line 257 to pressure limiter 282.
  • pressure limiter 282 is slightly offset with respect to the pressure in branch line 257, which results from the internal design of pressure limiter 282 and the pressure drop induced by the differential pressure provided by a preset check valve 287 placed in pilot line 286.
  • Check valve 287 is optional and placed in pilot line 286 in such a way that the check valve pressure drop occurs when pilot oil flows from the control port of regulator 282 in the direction of branch line 257.
  • Unit 28 of this embodiment also includes the one-way valve 281 and a three-way pressure limiter 282 mounted on connecting line 283 which connects the downstream side of valve 281 to the first line of auxiliary circuit 27.
  • Pressure limiter 282 is in the form of a three-way regulator valve which is connected by a first inlet/outlet to valve 281 and by a second inlet/outlet to circuit 27.
  • the overflow line of pressure limiter 282 is connected to a return line 284 similar to the one of the previous embodiments.
  • Pressure limiter 282 is designed to keep oil pressures in the part of line 283 comprised between pressure limiter 282 and circuit 27, at a predetermined level P 2 which is almost constant, whatever the flow going through unit 28.
  • units 28 of figures 4 and 5 can also be provided with an oil accumulator similar to the one of unit 28 of figure 3 .
  • the pressure regulating unit 28 of this embodiment also includes a one-way valve 281 and a pressure limiter 282 in the form of a three-way regulator valve installed, in the same way as in the fourth embodiment, on a connection line 283 which connects valve 281 to the outlet of unit 28 and circuit 27.
  • two check valves 288A and 288B are mounted on the downstream part of line 283, between pressure limiter 282 and circuit 27.
  • valves allow flow of oil in both directions, that is from pressure limiter 282 to circuit 27 and return, but the pressure drop in these check valves allows to increase the hysteresis of the opening of valve 281 on one side and pressure limiter 282 on the other side.
  • check valve 288A adds itself to the value of oil pressure at the outlet of unit 28 so that, even if pressure in a point similar to point P 271 of the first embodiment is at a level below P 1 , valve 281 will not systematically open.
  • pressure at a point similar to P 272 of the first embodiment exceeds pressure level P 2 set by pressure limiter 282
  • oil pressure sensed by pressure limiter 282 will be lower by an amount of ⁇ P B corresponding to the pressure drop in check valve 288B, so that pressure limiter 282 will not immediately open. Therefore, check valves 288A and 288B increase pressure variations hysteresis, which allows to minimize the quantity of oil flowing through unit 28.
  • the embodiment of figure 7 is similar to the one of figure 6 but for the addition of an oil accumulator 285.
  • the other parts of the pressure regulating unit 28 of this embodiment bear the same references as in the embodiment of figure 6 .
  • the pressure limiter is piloted according to oil pressure in the downstream part of line 283, that is according to oil pressure in circuit 27.
  • the invention allows to guarantee that oil provided to the hydraulic subsystems formed by ramp 19 and actuators 18 is kept clean by dedicated filter 273 which filters both all oil coming from return line 272 and all oil coming from circuit 25 via unit 28. Oil is provided to unit 27 with a pressure which varies by a limited amount and remains next to value P 2 set by pressure regulator 282.
  • the invention could also apply to en engine provided with other types of hydraulic subsystems, such as an oil driven fuel injection system or an oil driven braking system.
  • the invention is also applicable to an engine equipped with several hydraulic subsystems.
  • one or several auxiliary circuits are provided to feed these subsystems, together with a corresponding number of pressure regulating units.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Lubricants (AREA)

Claims (16)

  1. Schmiersystem (2) für einen Verbrennungsmotor (1), wobei das System umfasst
    - einen Hauptkreislauf (25), der eine Hauptpumpe (21) umfasst, die Öl aus einem Sumpf (22) abzieht und eine Hauptleitung (251) speist, die ein Motorschmierhauptsystem (11/11A, 14) mit Öl versorgt,
    - wenigstens einen Hilfskreislauf (27), der eine Hilfspumpe (274) aufweist, die ein hydraulisches Nebensystem (18, 19) und einen zugehörigen Filter (273) speist,
    dadurch gekennzeichnet, dass
    - der Hilfskreislauf (27) eine Rückfuhrleitung (272) umfasst, die Öl aus dem hydraulischen Nebensystem in Richtung der Eintrittszone des Hilfskreislaufs (27) zurückführt,
    - der Hilfskreislauf (27) von dem Hauptkreislauf (25) durch eine Druckregeleinheit (28) gespeist wird, und
    - der zugehörige Filter (273) so angepasst ist, dass er das ganze Öl filtert, das aus der Druckregeleinheit kommt.
  2. Schmiersystem nach Anspruch 1, dadurch gekennzeichnet, dass der zugehörige Filter (273) so angepasst ist, dass er auch Öl filtert, das von der Rückfuhrleitung (272) des Hilfskreislaufes (27) kommt.
  3. Schmiersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zugehörige Filter (273) eine Filtrationsnennleistung aufweist, die kleiner ist als die des Filters (23, 24) des Hauptkreislaufes (25).
  4. Schmiersystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Druckregeleinheit (28) ein Ein-Wege-Ventil (281), das so angepasst ist, dass es eine Ölzirkulation von dem Hauptkreislauf (25) zu dem Hilfskreislauf (27) erlaubt und eine Ölzirkulation von dem Hilfskreislauf zu dem Hauptkreislauf verhindert, und einen Druckbegrenzer (282) aufweist, der so ausgelegt ist, dass er selektiv eine Verbindung zwischen dem Hilfskreislauf und einem Teil der Rückfuhrleitung (284) herstellt, die Öl in Richtung des Sumpfes (22) zuführt.
  5. Schmiersystem nach Anspruch 4, dadurch gekennzeichnet, dass der Druckbegrenzer ein Zwei-Wege-Druckbegrenzer (282) ist, der an der Rückfuhrleitung (284) angebracht ist.
  6. Schmiersystem nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass der Druckbegrenzer (282) dem Öldruck in dem Hilfskreislauf (27) entsprechend gesteuert wird.
  7. Schmiersystem nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass der Druckbegrenzer (282) dem Öldruck in dem Hauptkreislauf (25) entsprechend gesteuert wird.
  8. Schmiersystem nach Anspruch 7, dadurch gekennzeichnet, dass die Druckregeleinheit (28) eine Steuerleitung (286) umfasst, die den Druckbegrenzer mit dem Hauptkreislauf (25) stromaufwärts (257) des Ein-Wege-Ventils (281) verbindet.
  9. Schmiersystem nach Anspruch 8, dadurch gekennzeichnet, dass die Steuerleitung ein Rückschlagventil (287) umfasst, das so angepasst ist, dass es eine Ölzirkulation von dem Druckregler (282) zu dem Hauptkreislauf (25) erlaubt, vorausgesetzt dass eine Druckdifferenz zwischen dem Steuerkanal des Reglers und dem Hauptkreislauf existiert.
  10. Schmiersystem nach Anspruch 4, dadurch gekennzeichnet, dass die Druckregeleinheit (28) einen Drei-Wege-Druckregler (282) umfasst, der zwei Einlässe/Auslässe, die jeweils mit der stromabwärtigen Seite des Ein-Wege-Ventils (281) und einem Teil des Hilfskreislaufs (27) verbunden ist, und einen anderen Auslass aufweist, der mit einer Leitung (284) verbunden ist, die eine Rückkehr von Öl zu der Pumpe (22) ermöglicht.
  11. Schmiersystem nach Anspruch 10, dadurch gekennzeichnet, dass die Druckregeleinheit (28) außerdem einen Satz von zwei voreingestellten Rückschlagventilen (288A, 288B) aufweist, die in entgegengesetzter Konfiguration zwischen dem Druckbegrenzer (282) und dem Hilfskreis (27) angeordnet sind.
  12. Schmiersystem nach einem der Ansprüche 4 bis 11, dadurch gekennzeichnet, dass die Druckregeleinheit (28) außerdem einen Ölsammler (285) umfasst, der in Fluidverbindung mit dem Hilfskreis (27) stromabwärts des Ein-Wege-Ventils (281) steht.
  13. Verbrennungsmotor (1) mit wenigstens einem Zylinder (12), der mit einem Kolben (13) versehen ist, der gleitend bewegbar in dem Zylinder angeordnet ist, und mit wenigstens einem hydraulischen Nebensystem (18, 19), dadurch gekennzeichnet, dass er ein Schmiersystem (2) nach einem der vorhergehenden Ansprüche aufweist.
  14. Verbrennungsmotor nach Anspruch 13, dadurch gekennzeichnet, dass das hydraulische Nebensystem ein nockenloses Ventilantriebssystem (18, 19) ist.
  15. Verbrennungsmotor nach Anspruch 13, dadurch gekennzeichnet, dass das hydraulische Nebensystem ein ölangetriebenes Kraftstoffeinspritzsystem ist.
  16. Verbrennungsmotor nach Anspruch 13, dadurch gekennzeichnet, dass das hydraulische Nebensystem ein ölangetriebenes Bremssystem ist.
EP05849094A 2005-12-27 2005-12-27 Schmiersystem und verbrennungsmotor mit solch einem system Not-in-force EP1969208B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/014224 WO2007073770A1 (en) 2005-12-27 2005-12-27 Lubrication system and internal combustion engine comrising such a system

Publications (2)

Publication Number Publication Date
EP1969208A1 EP1969208A1 (de) 2008-09-17
EP1969208B1 true EP1969208B1 (de) 2009-11-25

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EP05849094A Not-in-force EP1969208B1 (de) 2005-12-27 2005-12-27 Schmiersystem und verbrennungsmotor mit solch einem system

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EP (1) EP1969208B1 (de)
AT (1) ATE449903T1 (de)
DE (1) DE602005017953D1 (de)
WO (1) WO2007073770A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102052556A (zh) * 2011-01-06 2011-05-11 常州市三橡机械有限公司 捏炼精炼机用自动润滑系统
CN105697971B (zh) * 2014-11-24 2018-08-21 中车北京南口机械有限公司 电气控制系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3023803B2 (ja) * 1990-12-27 2000-03-21 本田技研工業株式会社 内燃機関における給油装置
JPH04111505U (ja) * 1991-03-15 1992-09-28 本田技研工業株式会社 内燃機関における給油装置
DE19619843C2 (de) * 1996-05-17 1999-03-04 Man B & W Diesel Gmbh Ölversorgungseinrichtung
US5682851A (en) * 1996-11-14 1997-11-04 Caterpillar Inc. Oil system for an engine that includes an auxiliary priming pump
JP2000045728A (ja) * 1998-08-03 2000-02-15 Unisia Jecs Corp 内燃機関の油圧回路
JP4086604B2 (ja) * 2002-09-18 2008-05-14 本田技研工業株式会社 内燃機関付き車両用動力装置の潤滑装置

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WO2007073770A1 (en) 2007-07-05
EP1969208A1 (de) 2008-09-17
DE602005017953D1 (de) 2010-01-07
ATE449903T1 (de) 2009-12-15

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