EP1672189B1 - Device for temperature regulation of a combustion engine - Google Patents

Device for temperature regulation of a combustion engine Download PDF

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Publication number
EP1672189B1
EP1672189B1 EP05301039A EP05301039A EP1672189B1 EP 1672189 B1 EP1672189 B1 EP 1672189B1 EP 05301039 A EP05301039 A EP 05301039A EP 05301039 A EP05301039 A EP 05301039A EP 1672189 B1 EP1672189 B1 EP 1672189B1
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EP
European Patent Office
Prior art keywords
oil
pressure
temperature
automatic regulation
cooler
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Not-in-force
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EP05301039A
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German (de)
French (fr)
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EP1672189A3 (en
EP1672189A2 (en
Inventor
Gonzalo Portela Garnica
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Renault SAS
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Renault SAS
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Publication of EP1672189A2 publication Critical patent/EP1672189A2/en
Publication of EP1672189A3 publication Critical patent/EP1672189A3/en
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Publication of EP1672189B1 publication Critical patent/EP1672189B1/en
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    • 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

  • the present invention relates to oil cooling systems for an internal combustion engine. It relates more particularly to a system for self-regulation of the engine oil temperature.
  • It also relates to an internal combustion engine for a motor vehicle equipped with the self-regulating system mentioned above.
  • the lubricating liquid is used because it comes into contact with the various moving parts of the engine.
  • this liquid In contact with these parts, this liquid is also responsible for calories, and must in turn be cooled.
  • this liquid In contact with these parts, this liquid is also responsible for calories, and must in turn be cooled.
  • the most commonly used means is an air / oil exchanger or water / oil called oil cooler.
  • the performance of such an oil cooler depends, for a given geometry, oil flow through the latter. Thus, the more oil passing through the cooler, the lower the average temperature of the oil in the engine will be lowered.
  • the amount of oil passing through the cooler is a function of engine speed. Indeed, the pumping of the oil to the points to be lubricated is achieved by a positive displacement pump actuated by the crankshaft. The higher the engine speed, the higher the flow and therefore the oil pressure.
  • the oil pumps are equipped with a pressure relief device. This device generally consists of a valve which deflects part of the oil sucked by the pump and redirects it either into the oil reservoir or to the inlet of the pump. pump. This portion of oil at high temperature does not pass through the cooler, is not cooled, which can be harmful to the engine. Here, the cooling of the oil is not optimized.
  • the publication GB737848 discloses an oil cooling system for an internal combustion engine.
  • the lubricant contained in the oil tank is pumped a first time to the cooler, then downstream of the cooler a new pump brings the oil to the points to be lubricated. All the oil pumped by the first pump passes through the cooler. The cooling of the oil is continuous. It is therefore impossible to control or regulate the temperature of the oil passing through the ducts.
  • this system involves the establishment of two pumps.
  • the document JP 04318215 presents a lubrication system comprising a cooler with two valves located downstream of the cooler.
  • a thermo-valve ensures the bypass of the cooler according to the temperature of the oil and a second valve regulates the oil pressure with a return to the oil tank.
  • This system has the disadvantage that all the oil does not pass through the cooler.
  • the object of the invention is to overcome these disadvantages, and therefore, to provide a cooling system for engine oil using only one pump, and in which all the lubricant discharged by the pump passes through the cooler, and then a part this oil returns to the tank to reduce the temperature and this, only when it exceeds a certain value, for a predetermined pressure threshold.
  • the invention proposes a system for self-regulation of the temperature of the oil, equipped with means for deflecting a portion of the oil towards the oil reservoir, these means being positioned downstream of a cooler, said deflection means acting when a temperature threshold ⁇ is reached by the oil flowing in the lubrication system.
  • the deviated oil portion is previously cooled.
  • the deflection of the oil is caused when a pressure threshold p is reached by the oil circulating in the lubrication system.
  • the pressure value triggering the deflection means is less than the pressure value triggering the pressure limiting means in the pump.
  • the deflection means of a portion of the oil consist of a valve comprising a compartment containing wax, a spring compressed between an abutment and said compartment, an orifice and a conduit.
  • the wax contained in the compartment can change phase thus allowing the elongation of the spring, so that the pressure p of the oil acting on the spring causes the opening of the orifice.
  • the invention also relates to an internal combustion engine equipped with a device according to the invention.
  • the figure 1 shows a lubrication circuit of an internal combustion engine (13).
  • This lubrication circuit consists of a volumetric oil pump 2 equipped with a pressure regulating valve 4, an oil cooler 5, a second pressure regulating valve 6 controlled by the temperature of the oil. oil, and conduits for routing the oil to the points of the engine to be lubricated from the tank 1.
  • the pressure regulating valve 4 is triggered, and allows the flow of oil to return to the tank 1 via the conduit re-circulation 3 ( figure 2 ) as represented by the arrow 14.
  • the self-regulating valve of the temperature 6 is equipped with a spring 11 which is compressed between an abutment 12 and a compartment 7 filled with solid wax. If the temperature of the oil reaches a predefined threshold, and the pressure level in the oil circuit downstream of the cooler 5 is close to but less than that prevailing in the pump 2 when the latter is close to the control , the discharge valve 6 ( Fig. 3 ) is actuated to release the orifice 8. In fact, the wax contained in the compartment 7 melts because of the increase in the temperature of the oil ( Fig. 3 ). This cast iron allows the expansion of the spring 11, the side opposite the stop 12, in the valve 6, because it is no longer subjected to pressure of the wax on the side of the compartment 7.
  • the pressure exerted by the oil on the spring 11 then causes its movement, until the release of the orifice 8.
  • the oil can flow to the tank 1 via the orifice 8 and the conduit 10.
  • the activation of the valve 6 reduces the overall pressure of the lubrication circuit and prevents the commissioning of the pressure regulating valve 4 because the pressure threshold necessary for the activation of the valve 6 is slightly lower than that which activates the valve 4.
  • the discharge of oil serving to no longer increasing the pressure in the oil circuit is now carried out downstream of the cooler.
  • the oil that should have re-circulated in the pump through the duct 3 without passing through the cooler 5, then passes through the cooler and is found in the tank 1 through the orifice 8 and the conduit 10, as shown by the arrow 9 on the figure 3 . This has the consequence of lowering the temperature of the oil present in the tank 1. With this solution, all of the oil available at the pump outlet 2 passes through the cooler 5 with consequently an increase in the calories taken from the pump. oil.

Abstract

The system has a pressure controlling valve (6) controlled by temperature of the oil. The valve has a spring (11) compressed between a stop (12) and a compartment (7) filled with solid wax. The valve is actuated for liberating an orifice (8) when temperature of the oil attains a predefined threshold and pressure level in an oil circuit in downstream of an oil cooler (5) is close but lesser than pressure in a volumetric oil pump (2). An independent claim is also included for an engine equipped with an oil temperature controlling system.

Description

La présente invention concerne les systèmes de refroidissement d'huile pour moteur à combustion interne. Elle concerne plus particulièrement un système permettant l'autorégulation de la température de l'huile moteur.The present invention relates to oil cooling systems for an internal combustion engine. It relates more particularly to a system for self-regulation of the engine oil temperature.

Elle concerne également un moteur à combustion interne pour véhicule automobile muni du système d'autorégulation précité.It also relates to an internal combustion engine for a motor vehicle equipped with the self-regulating system mentioned above.

Afin d'éviter une élévation excessive de la température des pièces en mouvement d'un moteur à combustion interne, il est nécessaire de les refroidir. A cette fin on utilise le liquide lubrifiant car il entre en contact avec les différents éléments mobiles du moteur.In order to avoid an excessive rise in the temperature of the moving parts of an internal combustion engine, it is necessary to cool them. For this purpose the lubricating liquid is used because it comes into contact with the various moving parts of the engine.

Au contact de ces pièces, ce liquide se charge lui aussi en calories, et doit à son tour être refroidi. Pour ce faire le moyen le plus couramment utilisé est un échangeur air\huile ou eau\huile appelé refroidisseur d'huile. La performance d'un tel refroidisseur d'huile dépend, pour une géométrie donnée, du débit d'huile traversant ce dernier. Ainsi, plus il y a d'huile traversant le refroidisseur, plus la température moyenne de l'huile présente dans le moteur sera abaissée.In contact with these parts, this liquid is also responsible for calories, and must in turn be cooled. To do this the most commonly used means is an air / oil exchanger or water / oil called oil cooler. The performance of such an oil cooler depends, for a given geometry, oil flow through the latter. Thus, the more oil passing through the cooler, the lower the average temperature of the oil in the engine will be lowered.

Dans la quasi-totalité des applications automobiles, la quantité d'huile passant à travers le refroidisseur, est fonction du régime moteur. En effet, le pompage de l'huile vers les points à lubrifier est réalisé par une pompe volumétrique actionnée par le vilebrequin. Plus le régime moteur est élevé, plus le débit et donc la pression de l'huile augmentent. Pour éviter un surplus de pression d'huile nuisible au bon fonctionnement du moteur, les pompes à huile sont équipées d'un dispositif limiteur de pression. Ce dispositif est en général constitué d'un clapet qui dévie une partie de l'huile aspirée par la pompe et la redirige soit dans le réservoir d'huile soit à l'admission de la pompe. Cette portion d'huile à haute température ne traversant pas le refroidisseur, n'est pas refroidie, ce qui peut être nuisible au du moteur. Ici, le refroidissement de l'huile n'est pas optimisé.In almost all automotive applications, the amount of oil passing through the cooler is a function of engine speed. Indeed, the pumping of the oil to the points to be lubricated is achieved by a positive displacement pump actuated by the crankshaft. The higher the engine speed, the higher the flow and therefore the oil pressure. To prevent excessive oil pressure which is detrimental to the proper functioning of the engine, the oil pumps are equipped with a pressure relief device. This device generally consists of a valve which deflects part of the oil sucked by the pump and redirects it either into the oil reservoir or to the inlet of the pump. pump. This portion of oil at high temperature does not pass through the cooler, is not cooled, which can be harmful to the engine. Here, the cooling of the oil is not optimized.

Afin de résoudre cet inconvénient la publication GB737848 divulgue un système de refroidissement d'huile pour moteur à combustion interne. Dans ce dispositif le lubrifiant contenu dans le réservoir d'huile est pompé une première fois vers le refroidisseur, puis en aval du refroidisseur une nouvelle pompe amène l'huile aux points à lubrifier. La totalité de l'huile pompée par la première pompe traverse le refroidisseur. Le refroidissement de l'huile y est continu. Il est donc impossible de contrôler ou de réguler la température de l'huile traversant les conduits. En outre, ce système entraîne la mise en place de deux pompes.In order to solve this problem the publication GB737848 discloses an oil cooling system for an internal combustion engine. In this device the lubricant contained in the oil tank is pumped a first time to the cooler, then downstream of the cooler a new pump brings the oil to the points to be lubricated. All the oil pumped by the first pump passes through the cooler. The cooling of the oil is continuous. It is therefore impossible to control or regulate the temperature of the oil passing through the ducts. In addition, this system involves the establishment of two pumps.

Le document JP 04318215 présente un système de lubrification comprenant un refroidisseur avec deux valves situées en aval du refroidisseur. Une thermo-valve assure le bypass du refroidisseur en fonction de la température de l'huile et une deuxième valve régule la pression d'huile avec un retour vers le réservoir d'huile. Ce système présente l'inconvénient que la totalité de l'huile ne passe pas par le refroidisseur.The document JP 04318215 presents a lubrication system comprising a cooler with two valves located downstream of the cooler. A thermo-valve ensures the bypass of the cooler according to the temperature of the oil and a second valve regulates the oil pressure with a return to the oil tank. This system has the disadvantage that all the oil does not pass through the cooler.

Le but de l'invention est de résoudre ces inconvénients, et donc, de fournir un système de refroidissement pour huile moteur n'utilisant qu'une pompe, et dans lequel la totalité du lubrifiant débité par la pompe traverse le refroidisseur, puis une partie de cette huile retourne dans le réservoir pour en diminuer la température et ceci, uniquement lorsque celle-ci dépasse une certaine valeur, pour un seuil de pression prédéterminé.The object of the invention is to overcome these disadvantages, and therefore, to provide a cooling system for engine oil using only one pump, and in which all the lubricant discharged by the pump passes through the cooler, and then a part this oil returns to the tank to reduce the temperature and this, only when it exceeds a certain value, for a predetermined pressure threshold.

Dans ce but, l'invention propose un système d'autorégulation de la température de l'huile, équipé de moyens de déviation d'une partie de l'huile vers le réservoir d'huile, ces moyens étant positionnés en aval d'un refroidisseur, lesdits moyens de déviation agissant lorsqu'un seuil de température θ est atteint par l'huile circulant dans le système de lubrification.For this purpose, the invention proposes a system for self-regulation of the temperature of the oil, equipped with means for deflecting a portion of the oil towards the oil reservoir, these means being positioned downstream of a cooler, said deflection means acting when a temperature threshold θ is reached by the oil flowing in the lubrication system.

Avantageusement, la partie d'huile déviée est préalablement refroidie.Advantageously, the deviated oil portion is previously cooled.

De manière préférée, la déviation de l'huile est provoquée lorsqu'un seuil de pression p est atteint par l'huile circulant dans le système de lubrification.Preferably, the deflection of the oil is caused when a pressure threshold p is reached by the oil circulating in the lubrication system.

De façon avantageuse, la valeur de pression déclenchant les moyens de déviation est inférieure à la valeur de pression déclanchant les moyens limiteurs de pression dans la pompe.Advantageously, the pressure value triggering the deflection means is less than the pressure value triggering the pressure limiting means in the pump.

Avantageusement, les moyens de déviation d'une partie de l'huile se composent d'un clapet comportant un compartiment contenant de la cire, un ressort comprimé entre une butée et le dit compartiment, un orifice et un conduit .Advantageously, the deflection means of a portion of the oil consist of a valve comprising a compartment containing wax, a spring compressed between an abutment and said compartment, an orifice and a conduit.

Enfin, lorsque la température de l'huile atteint la température θ pour une pression p, la cire contenue dans le compartiment peut changer de phase autorisant ainsi l'allongement du ressort, de sorte que la pression p de l'huile agissant sur le ressort provoque l'ouverture de l'orifice.Finally, when the temperature of the oil reaches the temperature θ for a pressure p, the wax contained in the compartment can change phase thus allowing the elongation of the spring, so that the pressure p of the oil acting on the spring causes the opening of the orifice.

L'invention concerne également un moteur à combustion interne équipé d'un dispositif selon l'invention.The invention also relates to an internal combustion engine equipped with a device according to the invention.

D'autres avantages et caractéristiques de l'invention apparaîtront mieux à la lecture de la description détaillée d'un exemple non limitatif de réalisation de la présente invention, faite en référence aux figures suivantes qui représentent :

  • Figure 1 : une vue schématique d'un circuit de lubrification d'un moteur à combustion interne équipé du dispositif d'autorégulation selon l'invention.
  • Figure 2 et 3 : des vues schématiques partielles représentant le fonctionnement étape par étape du dispositif selon l'invention, et en particulier l'interaction des moyens de déviation de l'huile vers le réservoir d'huile et des moyens limiteurs de pression.
Other advantages and features of the invention will appear better on reading the detailed description of a non-limiting embodiment of the present invention, with reference to the following figures which represent:
  • Figure 1 : a schematic view of a lubrication circuit of an internal combustion engine equipped with the self-regulating device according to the invention.
  • Figure 2 and 3 : partial schematic views showing the step by step operation of the device according to the invention, and in particular the interaction of the oil deflecting means to the oil reservoir and pressure limiting means.

La figure 1 montre un circuit de lubrification d'un moteur à combustion interne (13). Ce circuit de lubrification se compose d'une pompe à huile volumétrique 2 équipée d'un clapet de régulation de pression 4, d'un refroidisseur d'huile 5, d'un second clapet de régulation de pression 6 contrôlé par la température de l'huile, et de conduits permettant d'acheminer l'huile vers les points du moteur à lubrifier à partir du réservoir 1.The figure 1 shows a lubrication circuit of an internal combustion engine (13). This lubrication circuit consists of a volumetric oil pump 2 equipped with a pressure regulating valve 4, an oil cooler 5, a second pressure regulating valve 6 controlled by the temperature of the oil. oil, and conduits for routing the oil to the points of the engine to be lubricated from the tank 1.

Lorsque la température de l'huile est inférieure à un certain seuil et que la pression dans le circuit est elle aussi inférieure à une valeur prédéterminée (figure 1), le clapet de régulation de pression 4 et le clapet de régulation de température 6 sont tous deux inactifs. L'intégralité de l'huile pompée est à cet instant amenée vers les organes mobiles du moteur 13. Le circuit d'huile se comportant comme un circuit classique, la pression d'huile augmente avec le régime moteur.When the oil temperature is below a certain threshold and the pressure in the circuit is also below a predetermined value ( figure 1 ), the pressure regulating valve 4 and the temperature control valve 6 are both inactive. The entire pumped oil is at this moment brought to the moving parts of the engine 13. As the oil circuit behaves like a conventional circuit, the oil pressure increases with the engine speed.

Dès lors que le moteur 13 n'a plus besoin du niveau de pression d'huile régnant dans le circuit lubrificateur, le clapet de régulation de pression 4 se déclenche, et autorise le flux d'huile à retourner dans le réservoir 1 via le conduit de re-circulation 3 (figure 2) comme représenté par la flèche 14.As soon as the engine 13 no longer needs the oil pressure level prevailing in the lubricator circuit, the pressure regulating valve 4 is triggered, and allows the flow of oil to return to the tank 1 via the conduit re-circulation 3 ( figure 2 ) as represented by the arrow 14.

Le clapet d'autorégulation de la température 6 est équipé d'un ressort 11 qui se trouve comprimé entre une butée 12 et un compartiment 7 rempli de cire solide. Si la température de l'huile atteint un seuil prédéfini, et que le niveau de pression dans le circuit d'huile en aval du refroidisseur 5 est proche mais inférieur à celui qui règne dans la pompe 2 lorsque celle-ci est proche de la régulation, le clapet de décharge 6 (fig. 3) est actionné pour libérer l'orifice 8. En effet, la cire contenue dans le compartiment 7 fond à cause de l'augmentation de la température de l'huile (fig. 3). Cette fonte autorise l'expansion du ressort 11, du côté opposé à la butée 12, dans le clapet 6, car il n'est plus soumis à pression de la cire du côté du compartiment 7. La pression exercée par l'huile sur le ressort 11 provoque alors son déplacement, jusqu'à la libération de l'orifice 8. L'huile peut donc s'écouler vers le réservoir 1 via l'orifice 8 et le conduit 10. L'activation du clapet 6 diminue la pression générale du circuit de lubrification et empêche la mise en service du clapet de régulation de pression 4 car le seuil de pression nécessaire à l'activation du clapet 6 est légèrement inférieur à celui qui active le clapet 4. La décharge d'huile servant à ne plus augmenter la pression dans le circuit d'huile s'effectue à présent en aval du refroidisseur. L'huile qui aurait dû re-circulé dans la pompe par le conduit 3 sans passer par le refroidisseur 5, traverse dés lors le refroidisseur et se retrouve dans le réservoir 1 en passant par l'orifice 8 et par le conduit 10, comme représenté par la flèche 9 sur la figure 3. Ceci à pour conséquence d'abaisser la température de l'huile présente dans le réservoir 1. Grâce à cette solution la totalité de l'huile disponible en sortie de pompe 2 traverse le refroidisseur 5 avec par conséquent une augmentation des calories prélevées dans l'huile.The self-regulating valve of the temperature 6 is equipped with a spring 11 which is compressed between an abutment 12 and a compartment 7 filled with solid wax. If the temperature of the oil reaches a predefined threshold, and the pressure level in the oil circuit downstream of the cooler 5 is close to but less than that prevailing in the pump 2 when the latter is close to the control , the discharge valve 6 ( Fig. 3 ) is actuated to release the orifice 8. In fact, the wax contained in the compartment 7 melts because of the increase in the temperature of the oil ( Fig. 3 ). This cast iron allows the expansion of the spring 11, the side opposite the stop 12, in the valve 6, because it is no longer subjected to pressure of the wax on the side of the compartment 7. The pressure exerted by the oil on the spring 11 then causes its movement, until the release of the orifice 8. The oil can flow to the tank 1 via the orifice 8 and the conduit 10. The activation of the valve 6 reduces the overall pressure of the lubrication circuit and prevents the commissioning of the pressure regulating valve 4 because the pressure threshold necessary for the activation of the valve 6 is slightly lower than that which activates the valve 4. The discharge of oil serving to no longer increasing the pressure in the oil circuit is now carried out downstream of the cooler. The oil that should have re-circulated in the pump through the duct 3 without passing through the cooler 5, then passes through the cooler and is found in the tank 1 through the orifice 8 and the conduit 10, as shown by the arrow 9 on the figure 3 . This has the consequence of lowering the temperature of the oil present in the tank 1. With this solution, all of the oil available at the pump outlet 2 passes through the cooler 5 with consequently an increase in the calories taken from the pump. oil.

Claims (7)

  1. System for the automatic regulation of the oil temperature of a lubrication circuit, in particular for an internal combustion engine, comprising an oil reservoir (1), a pump (2) furnished with pressure-limiting means (3, 4) connected to this reservoir, a duct assembly and an oil cooler (5), diversion means (6, 8, 10) for diverting a portion of the oil to the reservoir (1), which are positioned downstream of the cooler (5), characterized in that the said diversion means (6, 8, 10) act when a temperature threshold (θ) is reached by the oil flowing in the lubrication system.
  2. System for the automatic regulation of oil temperature according to Claim 1, characterized in that the diverted portion of oil is first cooled.
  3. System for the automatic regulation of temperature according to Claim 2, characterized in that the diversion of the oil is caused when a pressure threshold (p) is reached by the oil flowing in the lubrication system.
  4. System for the automatic regulation of oil temperature according to Claim 3, characterized in that the pressure value triggering the diversion means (6, 8, 10) is below the pressure value triggering the pressure-limiting means (4, 3).
  5. System for automatic regulation according to Claim 4, characterized in that the means for diverting a portion of oil comprise a valve (6) comprising a compartment (7) containing wax, a spring (11) compressed between an abutment (12) and the said compartment (7), an orifice (8) and a duct (10).
  6. System for automatic regulation according to Claim 5, characterized in that, when the oil reaches the temperature (θ), the wax contained in the compartment (7) changes phase thus allowing the spring (11) to lengthen, so that the pressure (p) of the oil acting on the spring (11) causes the orifice (8) to open.
  7. Engine fitted with a system for automatic regulation according to any one of the preceding claims.
EP05301039A 2004-12-20 2005-12-12 Device for temperature regulation of a combustion engine Not-in-force EP1672189B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0453090A FR2879651B1 (en) 2004-12-20 2004-12-20 OIL TEMPERATURE SELF-REGULATION SYSTEM FOR INTERNAL COMBUSTION ENGINE

Publications (3)

Publication Number Publication Date
EP1672189A2 EP1672189A2 (en) 2006-06-21
EP1672189A3 EP1672189A3 (en) 2010-05-26
EP1672189B1 true EP1672189B1 (en) 2011-04-27

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ID=35149298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05301039A Not-in-force EP1672189B1 (en) 2004-12-20 2005-12-12 Device for temperature regulation of a combustion engine

Country Status (4)

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EP (1) EP1672189B1 (en)
AT (1) ATE507373T1 (en)
DE (1) DE602005027651D1 (en)
FR (1) FR2879651B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013103949A1 (en) * 2012-01-05 2013-07-11 Stolle Machinery Company, Llc Low pressure oil cooled composite ram bushing with secondary cooling

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE683901C (en) * 1937-07-02 1939-11-18 Maschf Augsburg Nuernberg Ag Device for automatic control of the oil cooling in vehicle internal combustion engines
GB737848A (en) 1952-12-04 1955-10-05 Daimler Benz Ag Improvements in lubricating means for internal combustion engines with a lubricant cooler
DE1932908A1 (en) * 1968-07-03 1970-03-26 Toyo Kogyo Company Ltd Device for controlling the temperature of the lubricant in an internal combustion engine
JPH04318215A (en) * 1991-04-16 1992-11-09 Mitsubishi Motors Corp Oil-cooled multiple cylinder engine
DE10045752A1 (en) * 2000-09-15 2002-03-28 Daimler Chrysler Ag Pump for supplying oil has pre-tension spring, pre-tension of which depends on temperature of fluid being pumped
JP2004232670A (en) * 2003-01-28 2004-08-19 Aisin Seiki Co Ltd Relief valve mechanism of oil pump

Also Published As

Publication number Publication date
FR2879651A1 (en) 2006-06-23
EP1672189A3 (en) 2010-05-26
ATE507373T1 (en) 2011-05-15
DE602005027651D1 (en) 2011-06-09
EP1672189A2 (en) 2006-06-21
FR2879651B1 (en) 2007-02-09

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