Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/12—Arrangements for cooling other engine or machine parts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
  • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
  • F02B29/04—Cooling of air intake supply
  • F02B29/0406—Layout of the intake air cooling or coolant circuit
  • F02B29/0437—Liquid cooled heat exchangers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
  • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
  • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
  • F02M26/32—Liquid-cooled heat exchangers

Definitions

• the present invention generally relates to cooling by conduction of the internal combustion engine components. It relates more particularly to a cooling support of a member of an internal combustion engine comprising:
• junction face that can be applied against a corresponding reception face of a cylinder head of the internal combustion engine
• a housing adapted to receive said member, and - a cooling channel provided for the circulation of a coolant.
• the invention finds a particularly advantageous application in the cooling of the valves for regulating the flow of recirculating gas (gas
• EGR EGR
• flue gas flue gas
• An internal combustion engine comprises a plurality of members subjected for the most part to high thermal stresses.
• the internal combustion engine comprises a cooling circuit in which circulates a cooling liquid.
• This cooling circuit extends in the cylinder head of the engine, around each of said members, to cool the latter by conduction of heat.
• Such a cooling circuit conventionally comprises a degassing outlet connected via a hose to an expansion tank. The latter not only makes it possible to extract any air bubbles that the circuit could contain, but also to absorb the expansions of the coolant when the temperature of the engine increases.
• the hose is generally located on the side of an end face of the cylinder head. It thus increases the length of the cylinder head, which does not facilitate its integration into a motor vehicle.
• convection cooling means such as fins.
• convection cooling means such as fins.
• the organs to be cooled must necessarily be designed in expensive materials and resistant to thermal stresses. Such temperatures nevertheless engender a seizure of the organs in their supports.
• the disassembly of these organs for example with a view to their replacement, at worst becomes impossible, at best requires the use of specific tools.
• the member is a movable member such as a valve, seizing reduces its performance and can cause fouling of this element harmful to the engine performance.
• a support traversed by a recirculating gas line (EGR) and a channel in which circulates a cooling liquid.
• EGR recirculating gas line
• This support is adapted to house a control valve of the recirculating gas flow. It is attached to the exhaust manifold of this engine, so that it is not part of the engine block.
• the channel has an inlet and a coolant outlet which are both connected to the engine cooling circuit.
• the present invention provides a compact, inexpensive support and effective liquid cooling of an engine member located outside the engine block. More particularly, it is proposed according to the invention a support as defined in the introduction, wherein said cooling channel has a coolant inlet adapted to be connected to a degassing outlet of a cooling circuit passing through said cylinder head, and a coolant outlet adapted to be connected to an expansion tank.
• the support not only allows to effectively cool the member housed in the housing of the support, but also to simplify the route of the hose connecting the cylinder head to the expansion vessel by decreasing its length. The overall size of the engine is thus substantially reduced.
• said coolant inlet is located at a height less than that of the coolant outlet
• said cooling channel extends from said coolant inlet to said coolant outlet along a strictly positive slope
• said cooling channel extends around at least a part of said housing
• a gas duct passing through said housing; and said gas duct has an inlet located on said junction face.
• the invention also relates to an internal combustion engine as defined in the introduction, which comprises such a support, the coolant inlet of which is connected to a degassing outlet of the cooling circuit which culminates in the cooling circuit, and a member inserted in the housing of said support.
• said member comprises at least one component movable relative to the support
• a fresh air intake line, a burned gas exhaust line and a flue gas recirculation line extending from the exhaust line to the intake line are provided, the housing the support being traversed by the recirculation line and said member housed in this housing comprising a flue gas flow control valve circulating in this recirculation line;
• the yoke has two end faces, an upper face, a lower face, and two lateral faces, one of which accommodates an air distributor and forms said reception face.
• FIG. 1 is a schematic view of an internal combustion engine according to the invention.
• FIG. 2 is a perspective view of the cylinder head of the internal combustion engine of Figure 1, and its air distributor and a support according to the invention.
• FIGS. 3 and 4 are perspective views, from two different angles, of the support of FIG.
• FIG. 1 diagrammatically shows an internal combustion engine 1 comprising a cylinder block provided here with four cylinders 11 and covered with a cylinder head 10.
• the internal combustion engine 1 Upstream of the cylinders 11, the internal combustion engine 1 comprises an intake line 20 which comprises an air filter 21 which filters the fresh air taken from the atmosphere.
• This intake line 20 further comprises a compressor 22 which compresses the fresh air filtered by the air filter 21, as well as a main air cooler 23 which cools this compressed fresh air.
• the inlet line 20 opens into an air distributor 24 which brings fresh air into each of the cylinders 11 of the cylinder block.
• the internal combustion engine 1 comprises an exhaust manifold 31 of burnt gases which is connected to an exhaust line 30 extending to the oxidation means of the flue gases formed here by a auxiliary catalyst 33 and the catalytic converter 34.
• the exhaust line 30 further comprises, downstream of the exhaust manifold 31, a turbine 32 which is driven by the flue gas stream and actuates the compressor 22.
• the internal combustion engine 1 also comprises an EGR recirculation line 40 of the flue gases, called recirculation gases.
• This recirculation line 40 accommodates an EGR cooler 41 provided for cooling the recirculating gases. It originates in the exhaust manifold 31 and opens into the intake line 20 via a support of an EGR valve 42 for regulating the flow of recirculating gas.
• the yoke 10 which forms the upper part of the engine block, has a generally parallelepiped shape. It thus has two end faces 13, 16, an upper face 15, a lower face 17, and two lateral faces 12, 14.
• the air distributor 24 is fixed on a first of the lateral faces 12, while the collector exhaust (not shown in this figure) is fixed on the other side face 14.
• This cylinder head 10 is conventionally traversed by intake ducts which connect the air distributor 24 to the cylinders 11, as well as by exhaust ducts, which connect the cylinders 11 to the exhaust manifold.
• the 31 also comprises a cooling circuit (not shown) in which circulates a cooling liquid.
• This cooling circuit is a semi-closed circuit in that it comprises a succession of pipes and chambers in which the coolant circulates in closed circuit, and a degassing outlet located at the highest point of this circuit. succession of pipes and chambers.
• the internal combustion engine 1 comprises a support 50 having a housing which accommodates an engine member which should be cooled.
• This support 50 has a junction face 51 adapted to be applied against a corresponding receiving face of the cylinder head 10. It is further traversed by a cooling channel provided for the circulation of a cooling liquid, this channel being born at the degassing outlet of the cooling circuit of the cylinder head 10 and opening on the side of an expansion tank 19.
• the support 50 is the support of the EGR valve, but of course, it could be a different support cooling any organ of the engine external to the engine block.
• the degassing outlet of the yoke 10 is designed to open on the first lateral face 12 thereof, so that the receiving face of the support 50 is located on this first lateral face 12.
• the support 50 of the EGR valve has a bent shape, with an inlet body 54 and an outlet body 53 whose longer lengths extend orthogonally relative to one another. to the other.
• This support 50 has a planar upper surface 52 on which different elements of the internal combustion engine 1 can be fixed.
• the output body 53 of the support 50 here has a shape of hollow parallelepiped. It comprises, on its upper face 52, two fresh gas inlets 72, 80 of respective circular and rectangular shapes. It further comprises, on its end face, two fresh gas outlets (not visible) which open into the air distributor 24. In this way, the fresh gases can flow from the fresh gas inlets 72, 80 to the cylinders 11.
• the output body 53 thus forms part of the intake line 20.
• the input body 54 has meanwhile a flat end face which constitutes its junction face 51 with the first lateral face 12 of the yoke 10.
• This input body 54 is able to be connected to this yoke 10 by ad hoc fastening means (not shown), such as a fastening flange.
• the housing 55 forms a cylindrical recess in the inlet body 54, which is designed to receive a movable valve of the EGR valve 42. One end of this recess is closed and while the other opens on the side of the upper face 52 of the support 50.
• the inlet body 54 is also traversed by a gas duct 70.
• the gas duct 70 forms part of the recirculation line 40. It passes through the housing 55. In this way, controlling in position the movable valve in the housing 55 regulates the flow of recirculation gas.
• An example of such a valve is more precisely described in the document EP 1 426 603 belonging to the applicant.
• the cooling channel 60 extends along the gas duct 70. It has, on the side of the outgassing outlet of the cooling circuit, a coolant inlet 61, and, on the side of the expansion tank 19 ( 1), a coolant outlet 62.
• the coolant inlet 61 is situated on the junction face 51 of the support 50, so as to be arranged opposite the degassing outlet of the cylinder 10.
• the cooling channel 60 passes through the inlet body 54 of the support 50 end-to-end, bypassing the housing 55 on half of its periphery.
• the coolant outlet 62 is located at the end of a finger projecting from the elbow formed by the support 50, along an axis orthogonal to the junction face 51 of the support. This finger makes it easy to connect the coolant outlet 62 to a hose 18 by a conventional coupling.
• the hose 18 is in turn designed to be connected to the expansion tank 19.
• the latter then makes it possible not only to extract any air bubbles that the cooling circuit of the cylinder head 10 could contain, but also to absorb dilatations of the coolant when the temperature of the engine increases.
• the mixture of air bubbles and coolant which passes through the cooling channel 60 of the support 55 thus makes it possible to cool the EGR valve, so as to prevent the latter from getting infected or deteriorating when the engine temperature is high.
• the cooling channel 60 extends from said coolant inlet 61 to said coolant outlet 62 at a strictly positive slope.
• the air bubbles do not stagnate in the cooling channel 60 but flow towards the expansion tank 19.
• the inlet 61 of the cooling channel 60 is furthermore designed to be positioned above the top point of the cooling circuit of the cylinder. the cylinder head 10.
• the gas duct 70 has meanwhile an inlet 71 located on said junction face 51 and an outlet that opens into the inlet 72 of fresh air located on the upper face 52 of the support 50. Its inlet 71 is connected to housing

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39165810

Family Applications (1)

Country Status (3)

Family Cites Families (3)

• 2007
  • 2007-06-21 FR FR0704440A patent/FR2917780B1/fr not_active Expired - Fee Related
• 2008
  • 2008-06-04 EP EP08805926A patent/EP2156028A2/de not_active Withdrawn
  • 2008-06-04 WO PCT/FR2008/050985 patent/WO2008155502A2/fr active Application Filing

Non-Patent Citations (1)

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