WO2021043431A1 - Moteur à combustion interne comportant un chanfrein de tourbillonnement excentrique pour un moteur à allumage commandé comprenant une culasse à quatre soupapes/flux transversal - Google Patents

Moteur à combustion interne comportant un chanfrein de tourbillonnement excentrique pour un moteur à allumage commandé comprenant une culasse à quatre soupapes/flux transversal Download PDF

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Publication number
WO2021043431A1
WO2021043431A1 PCT/EP2020/000141 EP2020000141W WO2021043431A1 WO 2021043431 A1 WO2021043431 A1 WO 2021043431A1 EP 2020000141 W EP2020000141 W EP 2020000141W WO 2021043431 A1 WO2021043431 A1 WO 2021043431A1
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WO
WIPO (PCT)
Prior art keywords
valve
tumble
inlet
internal combustion
combustion engine
Prior art date
Application number
PCT/EP2020/000141
Other languages
German (de)
English (en)
Inventor
Andreas Boemer
Marco Jung
Original Assignee
Deutz Aktiengesellschaft
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 Deutz Aktiengesellschaft filed Critical Deutz Aktiengesellschaft
Publication of WO2021043431A1 publication Critical patent/WO2021043431A1/fr

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Classifications

    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10262—Flow guides, obstructions, deflectors or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • 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
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B31/02—Modifying induction systems for imparting a rotation to the charge in the cylinder in engines having inlet valves arranged eccentrically to cylinder axis
    • 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
    • F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • 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
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B2031/006—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air intake valves
    • 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
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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
    • F02F2001/241—Cylinder heads specially adapted to pent roof shape of the combustion chamber
    • 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
    • F02F2001/246—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis and orientated radially from the combustion chamber surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the invention relates to a cylinder head of a gasoline engine with at least two inlet ducts which open out at a cylinder head base, and each with a valve seat for an inlet valve provided in the inlet duct, the valve seat having a central axis.
  • the combustion process in an engine is particularly influenced by the flow in the cylinder.
  • Swirl is a vortex flow whose axis of rotation is parallel to the cylinder axis.
  • a tumble is a vortex flow whose axis of rotation is arranged at right angles to the cylinder axis.
  • a tumble combustion process is often used in gasoline engines. This combustion process generates a tumble flow generated on the inlet side, uses a roof-shaped combustion chamber and a piston bowl that supports the tumble flow. The tumble flow generated during the suction phase is crushed during the compression phase and converted into turbulence. The turbulence accelerates the combustion and enables good lean running properties and high exhaust gas recirculation rates.
  • a method for operating an internal combustion engine is known from EP 814245 B1, the gas exchange of which is controlled by periodically actuated inlet and outlet valves, the fresh gas flowing in via the inlet valve being impressed with a flow movement in such a way that the exhaust gas swirl flow and the fresh gas flow movement a charge stratification with increased fresh gas concentration in the vicinity of a spark plug sets in the combustion chamber and the swirl flow is impressed on the recirculated exhaust gas by a chamfer extending only partially around the flow cross-section, the directions of the two chamfers on the exhaust valves deviating from one another in such a way that form two swirl flows rotating in opposite directions around parallel cylinder axes, so that the flow movement impressed on the fresh gas is a tumble flow rotating transversely to the cylinder axis.
  • a cylinder head for a diesel or gasoline engine is known from DE 102008026728 A1.
  • the cylinder head has at least one inlet channel with a valve seat and inlet valve for each individual working cylinder.
  • the valve seat of the inlet valve is provided with a swirl chamfer, the swirl chamfers of two or all of the cylinders being designed differently.
  • the bevel angle or the size of the bevel can be considered as the variable size of the bevel.
  • Each inlet channel has a valve seat for an inlet valve and a chamfer in the area of the cylinder head base, which are designed and arranged in such a way that a swirling flow of the incoming gas is brought about.
  • EP 1215377 A1 describes a cylinder head of a diesel or gasoline engine with a cylinder head base and an inlet duct.
  • the inlet channel comprises a valve seat for an inlet valve.
  • a rib is arranged on the inner wall of the inlet channel in front of it.
  • the rib increases the vortex movement as it flows into the combustion chamber.
  • the rib can be at least partially formed when the inlet channel is formed or by machining the inner wall of the channel.
  • a cylinder head of a gasoline engine is known from FR 2890119 A1.
  • the cylinder head has a cylinder head base, two inlet channels and one valve seat for one inlet valve per inlet channel.
  • the inlet ducts each include a bevel that extends in the direction of the outlet ducts. As a result, a tumble flow is generated in the direction of the exhaust ducts when it flows into the cylinder.
  • DE 19619782 A1 discloses a cylinder head of a diesel or gasoline engine.
  • the cylinder head has a cylinder head base and an inlet channel with a valve seat for an inlet valve.
  • a raised section is provided in the inlet channel which directs the intake air flow in the inlet channel in the direction of the cylinder wall closest to the inlet valve, so that a tumble flow is generated.
  • the invention is based on the object of designing and arranging a cylinder head of a gasoline engine in such a way that a tumble flow is generated in a targeted manner.
  • the tumble bevels are particularly effective when the valve lift is low, i.e. when the valve is opened and closed, when the flow through the valve is forcibly guided to the bevel or the chamfer.
  • the outflow from the inlet channel runs primarily along the valve axis and is hardly influenced by the chamfer.
  • the chamfer leads to a significant increase in the tumble flow in the cylinder.
  • the efficiency of this measure is good; H. the movement of the cargo is significantly increased without the use of air being impaired in an inadmissible manner.
  • the chamfer can be introduced into series production without the cylinder head having to be redesigned in any other way.
  • the eccentric chamfer can be implemented with no production costs.
  • the maximum M is achieved in that the axis of symmetry of the bevel is arranged eccentrically and / or adjusted to the central axis of the valve seat.
  • the inclination of the axis of symmetry ensures that the inclination angle of the bevel surface varies over the circumference relative to the central axis.
  • the eccentric arrangement and the employment can of course be provided alternatively or in combination.
  • the formation of the bevel can therefore be determined by their flan kenwinkel, d. H. the cone angle of an eccentrically attached milling tool and / or by their employment, d. H. the angle of incidence between the axis of the milling tool and the surface normal of the cylinder head base.
  • the flank angle or cone angle is preferably between 100 ° and 140 °.
  • the setting or the setting angle is preferably between 0 ° and 10 °. Both measures can be used to produce a bevel that is asymmetrical to the central axis and with the desired alignment.
  • the cone angle of the eccentrically applied milling tool and / or the setting angle of the milling tool are selected in such a way that an efficient flow control is achieved.
  • Both currents thus converge in the area of the closest cylinder wall and are favorably deflected downwards so that a tumbling movement is initiated.
  • the alignment of the tumble bevels using one of the aforementioned angles is such that the flow deflection is aimed in the direction of the cylinder wall closest to the two inlet valves.
  • a tumble flow is generated in interaction with the curvature of the cylinder wall and, on the other hand, a distance between the tumble bevel and the cylinder wall is ensured.
  • the eccentricity E of the countersinks or tumble bevel is selected so that a significant intensification of the tumble flow is achieved without the flow quality of the inlet channels being significantly impaired.
  • the tumble flow 13 generated at the inlet channel 5 can only be fully used if the engine has a piston bowl 14 that supports the tumble flow.
  • a piston bowl 14 Compared to the deep bowl such as the omega bowl, such a piston bowl 14 also has the advantages that the flame paths from the spark plug 12 to the edge of the combustion chamber are particularly short and the surface area of the combustion chamber is small.
  • combustion chamber is filled with the aid of a turbocharger or a compressor.
  • a method for producing a cylinder head of a stationary gas engine is advantageous in which a milling tool is used to produce the bevel 11, which has a cone angle and is set with the eccentricity to the central axis and / or at an angle of attack to the central axis.
  • the gas engine is operated with a cylinder head as described above with a high scavenging pressure drop, the scavenging pressure drop being between 700 mbar and 1200 mbar.
  • the number and arrangement of the gas exchange organs in the cylinder depends on various boundary conditions.
  • the main criteria are the valve arrangement and the valve train, the arrangement of the mixture generator, desired filling and charge movement, required limit speed, package, friction, maintenance, timing drive, which determine the effort and manufacturing costs.
  • the basic characteristics of the charge movement are the swirl flow, the rotation of the cylinder charge around the cylinder axis and the tumble flow, the rotation around the axis perpendicular to the cylinder's vertical axis or around the longitudinal axis of the engine.
  • the charge movement turns out to be one of the most important parameters for combustion, as its modification can have significant effects on the combustion process.
  • By adapting the inlet ducts and / or the valve control times it is possible to specifically influence the mixture formation and the combustion process. Attempts are made to increase the turbulence by means of a directed flow and to prepare the mixture better and, for example in the case of stratified charging, to guide the charge in a targeted manner. An effect on the wall heat transfer, the mass transport and the propagation speed of the combustion can also be achieved.
  • the swirl flow is already taken into account when designing the inlet ducts, with different configurations being implemented.
  • One of the channels can be designed as a filling channel for this purpose.
  • the filling channel can be provided with a swirl flap that can be closed depending on the operating point.
  • the other channel is often referred to as the tangential channel and is used to generate the twist.
  • the air thus flows asymmetrically into the combustion chamber and induces a flow shape that rotates around the vertical axis of the cylinder, with the swirl level being able to increase as the swirl flap is adjusted more and more.
  • the opening of the filling channel is only expedient in areas of high speeds or towards full load.
  • the swirl flow is supported by a suitable design of the piston shape, with the so-called omega-bowl pistons proving themselves here.
  • the twist is also retained in the compression phase.
  • the tumble represents a flow around an axis perpendicular to the cylinder's vertical axis. This flow direction is achieved in that certain measures at the inlet force the air to flow through the upper part of the intake duct.
  • the suction channel is provided with a shape that supports the flow in the upper part of the channel, or the lower part of the channel is closed by a flap arranged in it.
  • the rotary flap closes the lower part of the suction duct and thus ensures a narrowing of the cross-section, which is accompanied by an increase in speed.
  • the tumble In comparison to the swirl, the tumble is not independent of the piston movement, which means that it breaks up into individual turbulence eddies at TDC. This behavior is desirable in gasoline engines because it creates a high level of turbulence.
  • a specially designed piston for example with a nose or as a lens piston, supports the deflection of the tumble flow.
  • Phase adjusters for the intake and exhaust side as well as partially and fully variable valve lift systems offer further options for targeted influencing of the gas exchange process.
  • Fig. 1 is a schematic diagram of the cylinder head in the view from below
  • FIG. 2 shows a schematic diagram of a sectional illustration of the cylinder head
  • FIG. 5 shows a section through an internal combustion engine with an eccentric tumble bevel.
  • a schematic diagram of the cylinder head 1 is shown in a view from below.
  • the inlet valves 3, the outlet valves 4 and the spark plug 12 can be seen.
  • the inlet channel 5 can be seen, to which the fresh air is closed brings the inlet valves 3. After the fresh air has flowed through the inlet channel, it has to pass the valves 3 and inevitably comes into the area of the eccentric tumble bevel 10 on the inlet valve.
  • the eccentric tumble bevel 10 on the inlet valve 3 is arranged on the opposite side of the valve disk as the inlet channel 5.
  • FIG. 2 shows a schematic diagram of the illustration from FIG. 1 in a side view.
  • the inlet valves 3, the outlet valves 4 and the spark plug 12 can be seen.
  • the inlet channel 5, which brings the fresh air to the inlet valves 3, can also be seen. After the fresh air has flowed through the inlet duct, it has to pass the valves 3 and inevitably comes into the area of the eccentric tumble bevel 10 on the inlet valve.
  • the eccentric tumble bevel 10 on the inlet valve 3 is arranged on the opposite side of the valve disk than the inlet channel 5.
  • the outlet channel 6 leads away from the outlet valves, through which the exhaust gases flow after they have passed the open outlet valves 4.
  • FIG. 3 A schematic representation of swirl and tumble flow can be seen in FIG. 3.
  • FIG. 5 a section through an internal combustion engine with an eccentric tumble bevel 11 is disclosed.
  • the inlet valves 3, the outlet valves 4 and the spark plug 12 can be seen.
  • the inlet channel 5, which brings the fresh air to the inlet valves 3, can also be seen. After the fresh air has flowed through the inlet channel, it has to pass the valves 3 and inevitably comes into the area of the eccentric tumble bevel 10 at the inlet valve.
  • the eccentric tumble bevel 10 on the inlet valve 3 is arranged on the opposite side of the valve disk as the inlet channel 5.
  • the fibers at the outlet of the inlet channels are designed eccentrically in the outlet direction.
  • the fresh air or the gas / air mixture preferably flows into the combustion chamber in such a way that the tumble occurs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

L'invention concerne un moteur à combustion interne comportant un chanfrein de tourbillonnement excentrique pour un moteur à allumage commandé comprenant une culasse à quatre soupapes/flux transversal. L'invention concerne un moteur à combustion interne, en particulier un moteur à allumage commandé, comprenant au moins un carter de vilebrequin (2), au moins une culasse (1), cette culasse comprenant au moins une soupape d'admission (3) et au moins une soupape d'évacuation (4), la soupape d'admission (3) et la soupape d'évacuation (4) comportant respectivement un siège de soupape (8, 9) et au moins un canal d'admission (5) ainsi qu'un canal d'évacuation (6), et au moins un piston comportant des segments de piston et le vilebrequin correspondant. Cette invention est caractérisée en ce que dans la zone de la soupape d'entrée (3) et du siège de soupape (8) associé, un chanfrein de tourbillonnement (10) excentrique est agencé.
PCT/EP2020/000141 2019-09-04 2020-08-05 Moteur à combustion interne comportant un chanfrein de tourbillonnement excentrique pour un moteur à allumage commandé comprenant une culasse à quatre soupapes/flux transversal WO2021043431A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019006238.8A DE102019006238A1 (de) 2019-09-04 2019-09-04 Brennkraftmaschine mit exzentrischer Tumblefase für einen Ottomotor mit Vierventil/Querstrom-Zylinderkopf
DE102019006238.8 2019-09-04

Publications (1)

Publication Number Publication Date
WO2021043431A1 true WO2021043431A1 (fr) 2021-03-11

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PCT/EP2020/000141 WO2021043431A1 (fr) 2019-09-04 2020-08-05 Moteur à combustion interne comportant un chanfrein de tourbillonnement excentrique pour un moteur à allumage commandé comprenant une culasse à quatre soupapes/flux transversal

Country Status (2)

Country Link
DE (1) DE102019006238A1 (fr)
WO (1) WO2021043431A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020125865A1 (de) 2020-10-02 2022-04-07 Man Truck & Bus Se Tumblebasiertes Gas-Brennverfahren für eine ottomotorische Brennkraftmaschine
CN113404611A (zh) * 2021-08-19 2021-09-17 潍柴动力股份有限公司 一种气缸盖以及燃气发动机
CN113404612B (zh) * 2021-08-19 2021-12-21 潍柴动力股份有限公司 一种发动机缸盖与一种燃气发动机
DE102021005649A1 (de) 2021-11-15 2023-05-17 Daimler Truck AG Wasserstoffmotor sowie Kraftfahrzeug mit einem solchen Wasserstoffmotor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2890119A1 (fr) * 2005-08-30 2007-03-02 Renault Sas Culasse de moteur a combustion interne comprenant une tete de cylindre adaptee a favoriser la combustion d'un melange de gaz dans le cylindre
WO2013023858A1 (fr) * 2011-08-12 2013-02-21 Mwm Gmbh Culasse présentant un chanfrein pour écoulement tourbillonnaire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2890119A1 (fr) * 2005-08-30 2007-03-02 Renault Sas Culasse de moteur a combustion interne comprenant une tete de cylindre adaptee a favoriser la combustion d'un melange de gaz dans le cylindre
WO2013023858A1 (fr) * 2011-08-12 2013-02-21 Mwm Gmbh Culasse présentant un chanfrein pour écoulement tourbillonnaire

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