Classifications

• • 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
  • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
  • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
• • 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
  • F01P3/02—Arrangements for cooling cylinders or cylinder heads
• • 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
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads
  • F02F1/26—Cylinder heads having cooling means
  • F02F1/36—Cylinder heads having cooling means for liquid cooling
  • F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream 
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads
  • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
  • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
• • 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
  • F02B1/00—Engines characterised by fuel-air mixture compression
  • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
  • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
• • 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
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B2075/1804—Number of cylinders
  • F02B2075/1816—Number of cylinders four
• • 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
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
  • F02B75/18—Multi-cylinder engines
  • F02B75/20—Multi-cylinder engines with cylinders all in one line
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads
  • F02F2001/244—Arrangement of valve stems in cylinder heads
  • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Definitions

• the present invention relates to a cylinder head for an internal combustion engine intended in particular to equip a vehicle such as an automobile or a motorcycle.
• the invention relates more particularly to a cooling circuit extending through a cylinder head of the engine.
• Cooling by circulation of a liquid such as water is the most commonly used cooling mode for cooling internal combustion engines in particular because it allows to evacuate a large flow of calories even in areas very confined like cylinder heads and also because the liquid allows by its mass to ensure a certain acoustic insulation of the engine.
• the main functions of an engine liquid cooling circuit are therefore to cool the hot parts of the engine by forced circulation through the engine and to transfer the calories thus withdrawn to the ambient air through a liquid / air heat exchanger. called radiator.
• the object of the present invention is to propose a cylinder head for an internal combustion engine comprising a cooling circuit which is both efficient and simple to produce.
• the cylinder head for a liquid-cooled internal combustion engine comprises intake and exhaust ducts opening through the walls of the combustion chambers formed on its underside by orifices cooperating with rod valves and a circuit. for the coolant intended in particular to cool said walls of the combustion chambers.
• the cylinder head for a liquid-cooled internal combustion engine is characterized in that, the cooling circuit includes rise passages of water which extend parallel to the housings provided for the stems of the exhaust valves.
• the coolant circuit comprises water inlet orifices on the underside of the cylinder head, a water chamber s 'extending at the periphery of the walls of the combustion chamber, rising water passages extending substantially parallel and close to the housings of the exhaust valve stems and a manifold extending transversely in the upper part of the cylinder head to open on the side admission side of the cylinder head through a water outlet orifice.
• the water chamber disposed at the periphery of the walls of a corresponding combustion chamber extends substantially parallel to the underside of the cylinder head.
• the water chamber disposed at the periphery of the walls of a corresponding combustion chamber is of substantially toroidal shape.
• the water rise passages leave the water chamber by surrounding partially the exhaust ports formed through the walls of the corresponding combustion chamber.
• each combustion chamber cooperating with a spark plug coming to be housed in a well vertically passing through the cylinder head all or part of the rise passages of corresponding water extend near said spark plug well in particular in the lower part of the latter so as to cool the vicinity of the electrodes of the spark plug.
• each combustion chamber cooperating with two exhaust valves, the corresponding water rise passages are then three in number, namely a central passage extending between the two housings provided for the passage of the exhaust rods and two lateral passages extending substantially curved on either side of said housing.
• the water uplift passages associated with two adjacent combustion chambers open into a same collecting gallery extending transversely between the two chambers combustion.
• each water chamber cooperates with a degassing passage extending opposite to the rising water passages, said passage degassing opening onto the adjacent intake side face of the cylinder head.
• the two water chambers extending at the periphery of two adjacent combustion chambers are connected together by at least one degassing passage opening in the lower part of the lateral intake side of the cylinder head through a specific outlet orifice.
• water inlet orifices of suitable section open into each water chamber substantially vertically upstream water passages .
• Figure 1 is a perspective view of a foundry core for the cylinder head of an internal combustion engine defining a cooling circuit 1 according to the invention
• Figure 2 is a view similar to Figure 1 where have been shown schematically around the water core the intake and exhaust ducts and the corresponding valves;
• FIG. 3 is a partial bottom view of a cylinder head having been obtained using the core of FIG. 1.
• the cylinder head, referenced 1 in FIG. 3, which has been chosen to illustrate the water circuit according to the invention relates more particularly to an internal combustion engine, with four times and controlled ignition.
• the operating mode of the engine four or two stroke, controlled ignition or compression ignition, is in no way limitative of the invention.
• the engine may be of the single-cylinder type as well as of the in-line, V-shaped, or flat multi-cylinder type.
• the engine more particularly studied for equipping a motorcycle is a V-shaped four-cylinder comprising two substantially identical cylinder heads. Only one of the two cylinder heads has therefore been shown.
• the cylinder head 1 shown is of the liquid-cooled type and cross-flow (or "cross-flow") that is to say that the intake and exhaust ducts extend respectively on either side from the longitudinal median plane of the cylinder head.
• This cylinder head 1 made of aluminum alloy is conventionally obtained by molding.
• the foundry process used in the example illustrated is a gravity or low pressure casting combining sand cores and metallic external imprints.
• the sand cores define the various passages passing through the cylinder head 1 such as the intake and exhaust ducts or even the cooling circuit.
• the cylinder head 1 comprises, on its lower face 2 intended to come into abutment with the interposition of a seal against the cylinder block, not shown, walls 3 of suitable shapes delimiting two combustion chambers. These two combustion chambers opening out opposite the corresponding cylindrical bores of the cylinder block, are identical and extend substantially along the longitudinal axis of the cylinder head 1.
• the walls 3 delimiting the combustion chambers are pierced by two intake orifices 4 and two exhaust orifices 5 provided with attached seats.
• the orifices 4 and 5 which extend on either side of the median plane longitudinal of the cylinder head, are extended by conduits 6 and 7 (shown in dotted lines in FIG. 2) respectively for admitting the fuel mixture and for exhausting the burnt gases.
• These inlet and exhaust ducts 6 and 7 extend through the cylinder head 1 to lead respectively to the upper face of the cylinder head and to a lateral face of the latter also called the "exhaust" face.
• the orifices 4 and 5 cooperate with rod valves slidably mounted in attached guides inserted in corresponding housings of the cylinder head. These valves are operated by suitable control mechanisms not shown. Only the housings 8 and 9 of the valve guides, respectively of intake and exhaust, have been shown in dotted lines in FIG. 2.
• the cylinder head 1 also has passages or wells 13 extending substantially in the axis of the cylinders and opening substantially at the center of each of the walls 3 delimiting the combustion chambers to allow the passage of non-illustrated spark plugs.
• the cylinder head comprises from the foundry a circuit adapted for the circulation of the coolant coming from the cylinder block.
• the cooling circuit is described in the case of a cylinder head with two combustion chambers but obviously it can be extended or reduced to be used on any cylinder head regardless of the number of combustion chambers.
• the cooling circuit is in the form of two elementary circuits 10 which are substantially identical and each suitable for cooling a given combustion chamber.
• Each elementary circuit 10 is composed of an annular cavity 11 also called a water chamber extending at the periphery of the walls 3 of the corresponding combustion chamber, of passages known as rising water passages 14, 15 and 16 s' extending substantially parallel and close to the housings of the exhaust valve stems and of a collecting gallery 19 extending transversely in the upper part of the cylinder head to lead to the lateral face known as "intake" of the cylinder head by an outlet orifice of water 20.
• annular cavity 11 also called a water chamber extending at the periphery of the walls 3 of the corresponding combustion chamber, of passages known as rising water passages 14, 15 and 16 s' extending substantially parallel and close to the housings of the exhaust valve stems and of a collecting gallery 19 extending transversely in the upper part of the cylinder head to lead to the lateral face known as "intake" of the cylinder head by an outlet orifice of water 20.
• Each water chamber 11 is supplied with cooling liquid through calibrated orifices 12 opening onto the underside of the cylinder head 1, as shown in FIG. 3. These orifices, provided opposite corresponding orifices of the upper tablature of the cylinder block, are adapted to supply the water chamber 11 according to a suitable flow of coolant.
• Each water chamber 11 of more or less toroidal shape is disposed at the periphery of the walls 3 of the corresponding combustion chamber so as to extend substantially parallel to the underside of the cylinder head.
• the rising water passages 14, 15, 16 associated with a water chamber 11 start from the latter by surrounding the seats of the exhaust valves positioned in line with the exhaust orifices 9.
• These water rise passages are three in number, namely a central passage 15 extending parallel and between the two housings 9 of the exhaust valve stems and two lateral passages 14 and 16 extending substantially curved. around the housings 9 of the exhaust valve stems.
• the lateral water rise passages 14 and 16 also extend in the vicinity of the spark plug well 13, in particular in the lower part of the latter so as to cool the vicinity of the spark plug electrodes.
• the two elementary circuits 10 associated with two adjacent combustion chambers open out jointly into the same collecting gallery 19 extending transversely between the two combustion chambers. Furthermore, the two circuits 10 put the water chambers into communication there by two passages a passage 18 extending substantially in the longitudinal axis of the cylinder head 1 and a passage 17 serving more particularly for degassing of the circuits which extends opposite the passages 14, 15, 16 for raising the water to lead to the adjacent intake side face of the cylinder head by an orifice 21 distinct from the orifice 20.
• a water inlet orifice 12 of suitable section is arranged. substantially vertical to each of the rising water passages.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9533587

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Citations (5)

• 1998
  • 1998-12-04 FR FR9815331A patent/FR2786815B1/fr not_active Expired - Fee Related
• 1999
  • 1999-11-26 ES ES99956155T patent/ES2200570T3/es not_active Expired - Lifetime
  • 1999-11-26 EP EP99956155A patent/EP1135587B1/de not_active Expired - Lifetime
  • 1999-11-26 WO PCT/FR1999/002928 patent/WO2000034640A1/fr active IP Right Grant
  • 1999-11-26 DE DE69910249T patent/DE69910249T2/de not_active Expired - Lifetime

Patent Citations (5)

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