EP1948913A1 - Systeme de lubrification et moteur a combustion interne comportant un tel systeme system - Google Patents

Systeme de lubrification et moteur a combustion interne comportant un tel systeme 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)
English (en)
Other versions
EP1948913B1 (fr
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/fr
Application granted granted Critical
Publication of EP1948913B1 publication Critical patent/EP1948913B1/fr
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)
EP05814828A 2005-11-10 2005-11-10 Systeme de lubrification et moteur a combustion interne comportant un tel systeme system Active EP1948913B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/013382 WO2007054124A1 (fr) 2005-11-10 2005-11-10 Systeme de lubrification et moteur a combustion interne comportant un tel systeme system

Publications (2)

Publication Number Publication Date
EP1948913A1 true EP1948913A1 (fr) 2008-07-30
EP1948913B1 EP1948913B1 (fr) 2010-02-17

Family

ID=36757442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05814828A Active EP1948913B1 (fr) 2005-11-10 2005-11-10 Systeme de lubrification et moteur a combustion interne comportant un tel systeme system

Country Status (4)

Country Link
EP (1) EP1948913B1 (fr)
AT (1) ATE458132T1 (fr)
DE (1) DE602005019483D1 (fr)
WO (1) WO2007054124A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130288843A1 (en) * 2010-10-15 2013-10-31 Vestas Wind Systems A/S Machine system having a lubrication system
DE102011087261A1 (de) * 2011-11-28 2013-05-29 Behr Gmbh & Co. Kg Vorrichtung zur Kühlung einer Brennkraftmaschine
CN104196588B (zh) * 2014-08-18 2016-06-08 南通常测机电设备有限公司 一种油温控制系统及其控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58135312A (ja) * 1982-02-08 1983-08-11 Nissan Motor Co Ltd 内燃機関のオイル供給装置
JPS6125906A (ja) * 1984-07-16 1986-02-05 Fuji Heavy Ind Ltd エンジンの潤滑装置
JPH01280610A (ja) * 1988-05-02 1989-11-10 Mazda Motor Corp アルコール燃料エンジンの潤滑装置
DE4325141A1 (de) * 1993-07-27 1995-02-02 Kloeckner Humboldt Deutz Ag Brennkraftmaschine
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
WO2007054124A1 (fr) 2007-05-18
EP1948913B1 (fr) 2010-02-17
DE602005019483D1 (de) 2010-04-01
ATE458132T1 (de) 2010-03-15

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