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
  • 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
  • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
  • F02B23/104—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on a side position of the 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
  • 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
  • F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
  • F02B2023/106—Tumble flow, i.e. the axis of rotation of the main charge flow motion is horizontal
• • 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
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
  • F02B2275/48—Tumble motion in gas movement in cylinder
• • 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
  • 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
• • 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
  • F02F3/00—Pistons 
  • F02F3/26—Pistons  having combustion chamber in piston head
• • 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

Definitions

• a direct-injection, spark-ignited piston internal combustion engine represents a complex system with regard to the arrangement of the charge exchange channels, the valve trains and the piston bowl, the design of which is made even more difficult by the fact that the injection nozzle is in a certain position with a view to optimal mixture preparation, which must take place within the combustion chamber must be placed.
• the space below the inlet channels between the gas inlet valves is suitable.
• this arrangement requires special constructive measures.
• a spark-ignited piston internal combustion engine with direct fuel injection in which a fuel injection nozzle opens into the combustion chamber between two gas inlet valves.
• This arrangement is specially designed for stratified charging. It has been found, however, that with this arrangement of the gas inlet valves in the assignment to the fuel injection nozzle in the so-called homogeneous operation, ie. H. in the case of fuel injection during the intake stroke with the gas inlet valves fully open, the valve plates of the gas inlet valves are hit more or less strongly by the injection jet. This shields parts of the fuel jet. A perfect mixture formation as a whole is not possible. In homogeneous operation, especially with stoichometric or under stoichiometric air conditions, this can lead to disturbing black smoke formation.
• the invention is based on the object of providing a thermodynamically favorable design for such a piston internal combustion engine. to create a concept through which black smoke formation can at least be reduced.
• bersonders is effectively achieved by the positioning of the gas inlet openings in the direction of the gas outlet side, that the gas inlet openings are higher than the mouth of the fuel injector and also further apart, so that with appropriate dimensioning of the diameter of the gas inlet openings when the gas inlet valves are open Valve plate can no longer be hit by the fuel jet.
• the shape of the resulting combustion chamber can be designed to be slightly asymmetrical with respect to a vertical section.
• a special embodiment is specified in claim 11. With this solution, it is possible to create the required space below the gas inlet channels for the injection nozzle in that the entire valve train to the outlet side is pivoted. The shape of the resulting combustion chamber roof is asymmetrical.
• Fig. 1 shows a vertical section through the upper
• Fig. 2 shows a cross section through the cylinder. the line II-II in Fig. 1,
• Fig. 4 is a vertical section through the upper
• Fig. 1 the vertical section through a cylinder 4 of a spark-ignited internal combustion piston engine with direct fuel injection is shown, which is provided with two gas inlet valves 1 and two gas outlet valves 2.
• the gas inlet valves 1 and the gas outlet valves 2 are arranged in a cylinder head and are only indicated in the drawing, namely the gas inlet valve 1 in the open position and the gas outlet valve 2 in the closed position.
• the cylinder head lies tightly on an end plane 3 of the cylinders 4.
• the combustion chamber 5 of the cylinder shown is delimited on the one hand by the piston 6 and on the other hand by a combustion chamber roof 8 formed in the cylinder head 7.
• a vertical plane extending perpendicular to the plane of the drawing is defined by the cylinder axis 13.
• the combustion chamber roof 8 is delimited by two roof surfaces 8.1 and 8.2 rising at an angle to the vertical plane defined by the cylinder axis 13, in which gas inlet openings 9 are arranged on the gas inlet side, open into the combustion chamber 5 through the gas inlet channels.
• gas outlet openings 11 On the gas outlet side, two gas outlet openings 11 are correspondingly arranged, which are connected to gas outlet channels.
• the gas inlet openings 9 and the gas outlet openings 11 are delimited by the valve seats for the gas inlet valves 1 and the gas outlet valves 2.
• a fuel injection device 14 is arranged, which opens out into the combustion chamber 5 with its nozzle 15.
• roof surface 8.2 of the combustion chamber roof is provided with a projection 16.1 and 16.2 which covers the edge of the cylinder and projects into the combustion chamber.
• the attachment has a cross, preferably perpendicular to the axis 14
• Fuel injection nozzle 14 aligned front surface 17, which is angled more steeply with respect to the roof surface 8.1. This results in a circular shape for the mouth of the insertion opening for the fuel injection nozzle 14, which can be flared at most with a slight retraction of the fuel injection nozzle.
• the gas inlet valves 1 are, according to the schematic bottom view.
• Fig. 2 reveals, in the direction of the ridge line 18 formed by the two roof surfaces 8.1 and 8.2, ie shifted in the direction of the gas outlet side.
• the gas inlet valves 1 are also shifted outward to the outermost edge of the cylinder walls which extend into the area of the combustion chamber roof.
• the shift in the direction of the ridge line 18 can be carried out so far that the free edge of the gas inlet openings touch or even cut the ridge line 18.
• the fuel jet from the fuel injection device 14 with the gas inlet valve 1 open as shown, can enter the combustion chamber such that the valve plates of the gas inlet valves 1 are not hit.
• the particular advantage of this arrangement of the fuel injection device 14 is, inter alia, that the nozzle mouth 15 does not protrude into the combustion chamber, possibly even being able to be withdrawn to a small extent with respect to the plane of the front surface 17 and thus when the fuel is ignited. Air mixture is somewhat protected against thermal stress.
• extension 16 While it is fundamentally possible to design the extension 16 only in the form of a slug projecting into the combustion chamber, as indicated by the dashed line 16.3 in FIG. 2, it is particularly expedient if the extension is formed by an angled section running parallel to the ridge line 18 the roof surface is formed, which covers the cylinder edge in the final plane 3. The extension extending over this area thus forms a desired squeezing surface both on the gas inlet side and on the gas outlet side in cooperation with a corresponding design of the piston crown of the piston 6.
• the piston crown of the piston 6 is roof-shaped in accordance with the combustion chamber roof, but is provided with a channel-shaped trough 20 which runs transversely to the roof surfaces and is provided by the gas inlet valves 1 descend towards the gas outlet valves 2.
• the edge of the trough-shaped trough 20 has a recess 19.
• the bottom of the trough 20 is curved upward at its end 21 facing the gas outlet valves 2 in the edge region.
• In the ridge area is the
• Fig. 4 an embodiment is shown which, based on the schematic vertical section acc.
• Fig. 1 shows a special arrangement of the valves.
• the entire valve arrangement is arranged asymmetrically with respect to the vertical plane defined by the cylinder axis 13.
• the gas inlet valves 1 assume a valve angle E of preferably approximately 20 degrees with respect to the vertical plane through the cylinder axis 13.
• the gas outlet valves 2 have a valve angle A of preferably approximately 30 degrees with respect to the vertical plane, the total angle between the inlet valves and outlet valves thus being approximately 50 degrees.
• a spark plug 17 is arranged laterally offset with respect to the cylinder axis 13 on the side of the vertical plane facing the gas outlet valves 2.
• the entire valve train is pivoted toward the outlet side, so that the valve angles of 20 degrees for the inlet and 30 degrees for the outlet result. It is thereby achieved that there is sufficient space for accommodating the fuel injection device and for the opening arranged between the two gas inlet openings for the opening of the fuel injection nozzle in the combustion chamber.
• the shape of the resulting combustion chamber roof is also asymmetrical.
• the tumble Due to the design of the piston bowl with its sloping piston crown, the tumble, ie the one around, becomes transverse to the cylinder axis 13 aligned axis stabilizing inlet flow and it is achieved that the tumble does not disintegrate in the compression stroke.
• the assignment of the nozzle to the combustion chamber and the design of the combustion chamber roof on the one hand and the recess in the piston crown on the other hand also has the advantage of a long free jet of the injected fuel of an air-guided direct injection process.

Landscapes

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=8058703

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Citations (1)

Family Cites Families (14)

• 1998
  • 1998-06-18 DE DE29810897U patent/DE29810897U1/de not_active Expired - Lifetime
• 1999
  • 1999-06-07 DE DE19981085T patent/DE19981085B4/de not_active Expired - Fee Related
  • 1999-06-07 JP JP2000554179A patent/JP4308434B2/ja not_active Expired - Fee Related
  • 1999-06-07 US US09/485,844 patent/US6325042B1/en not_active Expired - Lifetime
  • 1999-06-07 WO PCT/EP1999/003903 patent/WO1999065286A2/de not_active Ceased

Patent Citations (1)

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