EP1948913B1 - Lubrication system and internal combustion engine comprising such a system - Google Patents
Lubrication system and internal combustion engine comprising such a system Download PDFInfo
- Publication number
- EP1948913B1 EP1948913B1 EP05814828A EP05814828A EP1948913B1 EP 1948913 B1 EP1948913 B1 EP 1948913B1 EP 05814828 A EP05814828 A EP 05814828A EP 05814828 A EP05814828 A EP 05814828A EP 1948913 B1 EP1948913 B1 EP 1948913B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- crankshaft
- lubrication system
- interface
- internal combustion
- 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.)
- Active
Links
- 238000005461 lubrication Methods 0.000 title claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 title claims description 9
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 230000001050 lubricating effect Effects 0.000 claims abstract description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
Images
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
- F01M1/00—Pressure lubrication
- F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
-
- 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
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/002—Cooling
Definitions
- This invention concerns a lubrication system for an internal combustion engine. It also concerns an internal combustion engine including at least such a system.
- this cooling is not necessary, which means that a part of the power used to run the oil cooler is wasted.
- Such a cooling can even be an inconvenient for the part of oil intended to form a film, at an interface between moving parts.
- the invention aims at providing a lubrication system which is adapted to feed oil to a crankshaft and to at least one piston cooling jet, this system being more efficient to cool oil and needing less power than the ones of the prior art, which means that the overall fuel consumption of an engine equipped with such a system can be lower than the one of engines equipped with systems of the prior art.
- the invention concerns a lubrication system for an internal combustion engine, this system comprising a pump feeding a main line, providing oil to at least a support interface for a crankshaft of the engine, and a auxiliary line dedicated to supplying oil to at least one piston cooling jet, characterized in that an oil cooler is mounted on this auxiliary line.
- the oil cooler is adapted to lower temperature of the part of the oil which is actually provided to the piston cooling jets. Cooling of the pistons is very efficient since the temperature of oil sprayed by the jets onto the piston is relatively low. This increases the lifetime of the pistons.
- oil provided to the interface between the crankshaft and its bearings can be at a relatively high temperature, which is advantageous since oil viscosity decreases with temperature. In other words, friction at the interface between the crankshaft and the bearing(s) is lower than with relatively cold oil, so that less power is needed to drive the crankshaft.
- an oil cooler is provided in the circuit, a part of oil redirected towards the sump is cooled. Therefore there is no risk that oil temperature in the sump and at the interface exceeds a pre-set value.
- the lubrication system might incorporate one or several of the following features:
- the invention also concerns an internal combustion engine comprising at least a crankshaft an at least a piston cooling jet, this engine including also at least a lubrication system as mentioned here-above.
- the annexed figure is a scheme of a lubrication system according to the invention.
- the lubrication system represented on figure 1 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 slidebly movable within each cylinder 12, between a top dead centre position and a bottom dead centre position represented on figure 1 .
- a piston cooling jet 15 is provided for each cylinder 12 and is adapted to direct a flow of oil towards its piston 13, in particular when it is near its bottom dead centre position, as represented by arrows A 1 .
- Crankshaft 11 is supported by one or several bearings 16. Only one bearing 16 is represented on figure 1 . Oil is to be fed to each interface I between a bearing 16 and crankshaft 11.
- a lubrication system 2 includes a pump 21 adapted to suck oil from a sump or oil pan 22.
- Pump 21 feeds a main line 23 which extends up to each interface I.
- Main line 23 is divided into two parts, namely an upstream part, 231 and a downstream part 232.
- Upstream part 231 extends from pump 21 to a point P where an auxiliary line 24 starts.
- Downstream part 232 extends from point P to the or each interface I.
- Auxiliary line 24 takes off, at point P, a part of the flow of oil fed by pump 21 to interface I.
- Auxiliary line 24 feeds all pistons cooling jets 15 and includes a common duct 241 which feeds several branches 242, each branch 242 being dedicated to one jet 15.
- Oil provided to crankshaft 11 or to piston cooling jets 15 is directed, after use, to sump parts 221 and 222. These parts are connected to the main sump 22.
- An oil cooler 25 is mounted on common duct 241 between separation point P and first branch 242. Therefore, oil cooler 25 can lower the temperature of all the oil sent to the piston cooling jets 15, without influence on the temperature of the oil provided to interface I by main line 23.
- Oil cooler 25 is a water/oil type heat exchanger which is fed by cold or warm water as shown by arrow A 2 , warm or hot water being taken away, as shown by arrow A 3 .
- the temperature of water within heat exchanger 25 is close to 100°C.
- water is mixed with ethylene glycol or another anti-booling agent.
- liquid coolant oil coolers can be used with the invention, e.g. an oil/oil cooler.
- Air/oil coolers can also be used with the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
- This invention concerns a lubrication system for an internal combustion engine. It also concerns an internal combustion engine including at least such a system.
- It is known to use oil to lubricate moving parts of an internal combustion engine, e.g. to feed the interface between a crankshaft and one or several bearings. To this purpose, one creates an hydrostatic bearing with a film of which minimizes friction. It is also known e.g. from
US-A 5,220,891 andEP1 362 993 , to use fraction of a quantity of oil, provided by a pump in order to lubricate the moving parts of an engine, in order to feed some piston cooling jets. An oil cooler is provided on the main line of the lubricating system, downstream of the pump, which implies that the totality of oil delivered to the engine is cooled down, irrespectively of its future use. For at least a part of the oil, this cooling is not necessary, which means that a part of the power used to run the oil cooler is wasted. Such a cooling can even be an inconvenient for the part of oil intended to form a film, at an interface between moving parts. - The invention aims at providing a lubrication system which is adapted to feed oil to a crankshaft and to at least one piston cooling jet, this system being more efficient to cool oil and needing less power than the ones of the prior art, which means that the overall fuel consumption of an engine equipped with such a system can be lower than the one of engines equipped with systems of the prior art.
- To this purpose, the invention concerns a lubrication system for an internal combustion engine, this system comprising a pump feeding a main line, providing oil to at least a support interface for a crankshaft of the engine, and a auxiliary line dedicated to supplying oil to at least one piston cooling jet, characterized in that an oil cooler is mounted on this auxiliary line.
- Thanks to the invention, the oil cooler is adapted to lower temperature of the part of the oil which is actually provided to the piston cooling jets. Cooling of the pistons is very efficient since the temperature of oil sprayed by the jets onto the piston is relatively low. This increases the lifetime of the pistons. On the other hand, oil provided to the interface between the crankshaft and its bearings can be at a relatively high temperature, which is advantageous since oil viscosity decreases with temperature. In other words, friction at the interface between the crankshaft and the bearing(s) is lower than with relatively cold oil, so that less power is needed to drive the crankshaft. However, since an oil cooler is provided in the circuit, a part of oil redirected towards the sump is cooled. Therefore there is no risk that oil temperature in the sump and at the interface exceeds a pre-set value.
- According to further aspects of the invention, the lubrication system might incorporate one or several of the following features:
- The oil cooler is a liquid coolant/oil heat exchanger.
- The oil cooler is an air/oil heat exchanger.
- The system comprises several piston cooling jets, whereas the oil cooler is mounted on a part of the auxiliary line which feeds all these piston cooling jets.
- The invention also concerns an internal combustion engine comprising at least a crankshaft an at least a piston cooling jet, this engine including also at least a lubrication system as mentioned here-above.
- The invention will be better understood on the basis of the following description, which is given in correspondence with the annexed figure and as an illustrative example, without restricting the object of the invention. The annexed figure, is a scheme of a lubrication system according to the invention.
- The lubrication system represented on
figure 1 is adapted to be mounted onto an internal combustion engine 1 of a vehicle, e.g. a truck. Engine 1 comprises acrankshaft 11 andseveral cylinders 12, only two cylinders being represented onfigure 1 . Apiston 13 is slidebly movable within eachcylinder 12, between a top dead centre position and a bottom dead centre position represented onfigure 1 . Apiston cooling jet 15 is provided for eachcylinder 12 and is adapted to direct a flow of oil towards itspiston 13, in particular when it is near its bottom dead centre position, as represented by arrows A1. - Crankshaft 11 is supported by one or
several bearings 16. Only one bearing 16 is represented onfigure 1 . Oil is to be fed to each interface I between a bearing 16 andcrankshaft 11. - To this purpose, a
lubrication system 2 includes apump 21 adapted to suck oil from a sump oroil pan 22.Pump 21 feeds amain line 23 which extends up to each interface I.Main line 23 is divided into two parts, namely an upstream part, 231 and adownstream part 232.Upstream part 231 extends frompump 21 to a point P where an auxiliary line 24 starts.Downstream part 232 extends from point P to the or each interface I. - Auxiliary line 24 takes off, at point P, a part of the flow of oil fed by
pump 21 to interface I. Auxiliary line 24 feeds allpistons cooling jets 15 and includes acommon duct 241 which feedsseveral branches 242, eachbranch 242 being dedicated to onejet 15. - Oil provided to
crankshaft 11 or topiston cooling jets 15 is directed, after use, to sumpparts main sump 22. - An
oil cooler 25 is mounted oncommon duct 241 between separation point P andfirst branch 242. Therefore,oil cooler 25 can lower the temperature of all the oil sent to thepiston cooling jets 15, without influence on the temperature of the oil provided to interface I bymain line 23. -
Oil cooler 25 is a water/oil type heat exchanger which is fed by cold or warm water as shown by arrow A2, warm or hot water being taken away, as shown by arrow A3. Considering the temperature of the oil inline 25, the temperature of water withinheat exchanger 25 is close to 100°C. In order to keep water in liquid state at this temperature, water is mixed with ethylene glycol or another anti-booling agent. - Thanks to the location of
heat exchanger 25 on auxiliary line 24, which is dedicated to feedingpiston cooling jets 15, cooling of oil occurs only for the quantity of oil which is used as cooling medium forpistons 13, whereas oil provided to the interface I can be at a temperature higher than oil provided to jets 15. - As an example, one can consider an engine 1 mounted onto a truck where
pump 21 delivers 120 l/mn of oil,oil entering pump 21 being at a temperature of 118°C. If one considers that two thirds of oil pumped bypump 21 are directed to crankshaft/bearing interface I, then 80 l/mn of oil are used to create a film of oil at this interface, at a temperature of 118 °C. The remaining 40 l/mn of oil go throughheat exchanger 25 and their temperature is lowered from 118°C to about 96°C, which means that cooling ofpistons 13 is very efficient. This increases pistons lifetime. As a comparison, ifheat exchanger 25 were mounted onto theupstream part 231 ofmain line 23, oil coming out of this heat exchanger would be at a temperature of about 110°C, which means that its viscosity would be higher, so that friction at interface I would also be higher. - Thanks to the better efficiency of the oil film at the or each interface I, one can decrease the overall fuel consumption of engine 1 equipped with
lubrication system 2 according to the invention since the overall friction is lowered by an amount of 0,2 to 0,8 kW. Moreover, the power needed to runheat exchanger 25 is fully used since all oil going through this exchanger has to be cooled. - According to alternative embodiments which are not represented, other types of liquid coolant oil coolers can be used with the invention, e.g. an oil/oil cooler. Air/oil coolers can also be used with the invention.
-
- 1 engine
- 11 crankshaft
- 12 cylinder
- 13 piston
- 15 piston cooling jet
- 16 bearings
- 2 lubrication system
- 21 pump
- 22 sump
- 221 sump part
- 222 sump part
- 23 main line
- 231 upstream part
- 232 downstream part
- 24 auxiliary line
- 241 common duct
- 242 branch
- 25 oil cooler - heat exchanger
- A1 arrows
- A2 arrow
- A3 arrow
- I interface between 11 and 16
- P separation point
Claims (5)
- A lubrication system (2) for an internal combustion engine (1), said system comprising a pump (21) feeding a main line (23), providing oil to at least a support interface (I) for a crankshaft (11) of the engine, and an auxiliary line (24) dedicated to supplying oil to at least one piston cooling jet (15), characterized in that an oil cooler (25) is mounted on said auxiliary line.
- A lubrication system according to claim 1 characterized in that said oil cooler is a liquid coolant/oil heat exchanger (25).
- A lubricating system according to claim 1 characterized in that said cooler is an air/oil heat exchanger.
- A lubricating system according to one of the previous claims characterized in that it comprises several piston cooling jets (15) and in that said oil cooler (25) is mounted on a part (241) of said auxiliary line which feeds all piston cooling jets.
- An internal combustion engine comprising at least a crankshaft (11) and at least a piston cooling jet (15) characterized in that it includes at least a lubrication system (2) according to one of the previous claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2005/013382 WO2007054124A1 (en) | 2005-11-10 | 2005-11-10 | Lubrication system and internal combustion engine comprising such a system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1948913A1 EP1948913A1 (en) | 2008-07-30 |
EP1948913B1 true EP1948913B1 (en) | 2010-02-17 |
Family
ID=36757442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05814828A Active EP1948913B1 (en) | 2005-11-10 | 2005-11-10 | Lubrication system and internal combustion engine comprising such a system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1948913B1 (en) |
AT (1) | ATE458132T1 (en) |
DE (1) | DE602005019483D1 (en) |
WO (1) | WO2007054124A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103261592A (en) * | 2010-10-15 | 2013-08-21 | 维斯塔斯风力系统有限公司 | A machine system having a lubrication system |
DE102011087261A1 (en) * | 2011-11-28 | 2013-05-29 | Behr Gmbh & Co. Kg | Device for cooling internal combustion engine, has oil supply for providing lubrication and oil-fed cooling, where division of oil supply takes place downstream to main stream into cooling branch and lubrication branch |
CN104196588B (en) * | 2014-08-18 | 2016-06-08 | 南通常测机电设备有限公司 | A kind of Oil-temperature control system and control method thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58135312A (en) * | 1982-02-08 | 1983-08-11 | Nissan Motor Co Ltd | Oil supplying apparatus for internal-combustion engine |
JPS6125906A (en) * | 1984-07-16 | 1986-02-05 | Fuji Heavy Ind Ltd | Lubricating device for engine |
JPH01280610A (en) * | 1988-05-02 | 1989-11-10 | Mazda Motor Corp | Lubricating device for engine fueled with alcohol |
DE4325141A1 (en) * | 1993-07-27 | 1995-02-02 | Kloeckner Humboldt Deutz Ag | Internal combustion engine |
GB2388633B (en) * | 2002-05-15 | 2006-03-08 | Dana Automotive Ltd | Engine lubrication system |
-
2005
- 2005-11-10 WO PCT/EP2005/013382 patent/WO2007054124A1/en active Application Filing
- 2005-11-10 AT AT05814828T patent/ATE458132T1/en not_active IP Right Cessation
- 2005-11-10 DE DE602005019483T patent/DE602005019483D1/en active Active
- 2005-11-10 EP EP05814828A patent/EP1948913B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1948913A1 (en) | 2008-07-30 |
ATE458132T1 (en) | 2010-03-15 |
DE602005019483D1 (en) | 2010-04-01 |
WO2007054124A1 (en) | 2007-05-18 |
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