EP1948913A1 - Lubrication system and internal combustion engine comprising such a system - Google Patents

Lubrication system and internal combustion engine comprising such a system

Info

Publication number
EP1948913A1
EP1948913A1 EP05814828A EP05814828A EP1948913A1 EP 1948913 A1 EP1948913 A1 EP 1948913A1 EP 05814828 A EP05814828 A EP 05814828A EP 05814828 A EP05814828 A EP 05814828A EP 1948913 A1 EP1948913 A1 EP 1948913A1
Authority
EP
European Patent Office
Prior art keywords
oil
crankshaft
internal combustion
combustion engine
interface
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
EP05814828A
Other languages
German (de)
French (fr)
Other versions
EP1948913B1 (en
Inventor
Luc Aixala
Stéphane ROUSSILLON
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
Original Assignee
Renault Trucks SAS
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 Renault Trucks SAS filed Critical Renault Trucks SAS
Publication of EP1948913A1 publication Critical patent/EP1948913A1/en
Application granted granted Critical
Publication of EP1948913B1 publication Critical patent/EP1948913B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 cooier is mounted on this auxiliary iine.
  • 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 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 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-i.
  • 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 1 1.
  • 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.
  • 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 . Considering the temperature of the oil in line 25, the temperature of water within heat exchanger 25 is close to 100 0 C. In order to keep water in liquid state at this temperature, water is mixed with ethylene glycol or another anti-booling agent.
  • heat exchanger 25 were mounted onto the upstream part 231 of main line 23, oil coming out of this heat exchanger would be at a temperature of about 1 1O 0 C, which means that its viscosity would be higher, so that friction at interface I would also be higher.
  • 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

This lubrication system (2) comprises a pump (21) feeding a main line (23), providing oil to a support interface (I) for a crankshaft (11) of an engine (1). It also comprises an auxiliary line (24), dedicated to supplying oil to at least one piston cooling jet (15). An oil cooler (25) is mounted on the auxiliary line (24), which induces an efficient cooling of the oil used for cooling the pistons (13) of the engine (1), whereas oil used for lubricating the interface can be hot.

Description

LUBRICATION SYSTEM AND INTERNAL COMBUSTION ENGINE COMPRISING
SUCH A SYSTEM
TECHNICAL FIELD OF THE INVENTION
This invention concerns a lubrication system for an internal combustion engine. It also concerns an internal combustion engine including at least such a system.
BACKGROUND OF THE INVENTION
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 oil which minimizes friction. It is also known e.g. from US-A 5,220,891 , to use a 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.
SUMMARY OF THE INVENTION 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 cooier is mounted on this auxiliary iine. 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.
BRIEF DESCRIPTION OF THE DRAWING
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.
DETAILED DESCRIPTION OF SOME EMBODIMENTS 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-i. 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 1 1.
To this purpose, 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 A2, warm or hot water being taken away, as shown by arrow A3. Considering the temperature of the oil in line 25, the temperature of water within heat exchanger 25 is close to 1000C. 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 feeding piston cooling jets 15, cooling of oil occurs only for the quantity of oil which is used as cooling medium for pistons 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 1180C. If one considers that two thirds of oil pumped by pump 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 0C. The remaining 40 I/mn of oil go through heat exchanger 25 and their temperature is lowered from 1180C to about 960C, which means that cooling of pistons 13 is very efficient. This increases pistons lifetime. As a comparison, if heat exchanger 25 were mounted onto the upstream part 231 of main line 23, oil coming out of this heat exchanger would be at a temperature of about 1 1O0C, 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 run heat 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.
LIST OF REFERENCES
1 engine
1 1 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
Ai arrows
A2 arrow
A3 arrow
I interface between 11 and 16
P separation point

Claims

1°- 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.
2°- A lubrication system according to claim 1 characterized in that said oil cooler is a liquid coolant/oil heat exchanger (25).
3°- A lubricating system according to claim 1 characterized in that said cooler is an air/oil heat exchanger.
4°- 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.
5°- 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.
EP05814828A 2005-11-10 2005-11-10 Lubrication system and internal combustion engine comprising such a system Active EP1948913B1 (en)

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 true EP1948913A1 (en) 2008-07-30
EP1948913B1 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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012049322A1 (en) * 2010-10-15 2012-04-19 Vestas Wind Systems A/S 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)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007054124A1 *

Also Published As

Publication number Publication date
DE602005019483D1 (en) 2010-04-01
EP1948913B1 (en) 2010-02-17
ATE458132T1 (en) 2010-03-15
WO2007054124A1 (en) 2007-05-18

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