EP0094872A1 - Zweitaktbrennkraftmaschine mit Direkteinspritzung - Google Patents

Zweitaktbrennkraftmaschine mit Direkteinspritzung Download PDF

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Publication number
EP0094872A1
EP0094872A1 EP83400944A EP83400944A EP0094872A1 EP 0094872 A1 EP0094872 A1 EP 0094872A1 EP 83400944 A EP83400944 A EP 83400944A EP 83400944 A EP83400944 A EP 83400944A EP 0094872 A1 EP0094872 A1 EP 0094872A1
Authority
EP
European Patent Office
Prior art keywords
channels
cylinder
casings
motor according
axis
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP83400944A
Other languages
English (en)
French (fr)
Other versions
EP0094872B1 (de
Inventor
Armand Castarede
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SA
Original Assignee
Renault SA
Regie Nationale des Usines Renault
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 Renault SA, Regie Nationale des Usines Renault filed Critical Renault SA
Publication of EP0094872A1 publication Critical patent/EP0094872A1/de
Application granted granted Critical
Publication of EP0094872B1 publication Critical patent/EP0094872B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0021—Construction
    • F02F7/0036—Casings for two-stroke engines with scavenging conduits
    • 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 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the present invention relates to internal combustion engines operating according to the two-stroke cycle and with direct fuel injection, of the type whose crankcase-cylinder comprises at least one cylinder into which open air intake channels controlled by the piston. associ ..
  • the realization of the channels by coring does not make it possible to directly obtain from the foundry surface states compatible with good engine performance and therefore requires delicate machining operations which, on the one hand, limit the shape of the profile. longitudinal and of the section of the channels and, on the other hand, are generally impassable when the channels have come from the foundry in the cylinder block.
  • German patent 46 ⁇ . 884 It is also known from the German patent 46 ⁇ . 884 to cut a cylinder block into two parts assembled along a plane perpendicular to the cylinder axis and passing through air intake channels, essentially for reasons of mounting around a jacket with projections partially constituting these channels and to remove hot spots and temperature gradients around the cylinder.
  • the two-stroke engine shown is of the single-cylinder type, with compression ignition and direct injection of fuel into the combustion chamber, the injection system not having been shown for clarity of the drawing.
  • This engine comprises a cylinder block 1 surmounted by a cylinder head 2 in which is housed an exhaust valve 3.
  • a piston 5 articulated on a connecting rod 6 for driving a crankshaft (not shown ).
  • the piston 5 masks and discovers air intake channels 7 which make the cylinder 4 communicate with an air cover 8 surrounding the cylinder 4 and in which, in operation, a compressor (not shown) expels air admitted through an inlet pipe 9.
  • the cylinder 4 is delimited by a thin jacket 10 compressed over a small height and defining, with the cylinder block 1 and the cylinder head 2, a water chamber of cooling 11.
  • the jacket 10 has, at the right of the channels 7, large openings 12 which each uncover the openings of several of the channels 7 and can thus be easily obtained by machining.
  • the cylinder block 1 consists of two half-casings, namely an upper half-casing 1A and a lower half-casing 1B whose assembly plane (line 2-2 of FIG. 1 and line AA of FIG. 3) is perpendicular to the axis of the cylinder 4 and passes through the intake channels 7.
  • the two half-casings are assembled by four long tie rods 13 which pass through bosses 14 of the half-casings 1A and 1B and are screwed at one of their ends into the cylinder head 2.
  • the tie rods 13 thus put the half-casings in compression over their entire height and avoid the work in alternating traction of the least resistant parts of the casing 1.
  • the execution of the cylinder block 1 in two half-casings makes it possible to produce the latter by die-casting and thus obtain, rough foundry and according to the best geometry, the air intake channels 7.
  • These channels, considered in the assembly plane can be oriented angularly, for example substantially tangentially to a circle C concentric with the axis of the cylinder 4, as shown in FIG. 2, to generate the vortex favoring effective scanning. of the cylinder.
  • these channels can, in the same plane, have a shape ensuring the best flow coefficient, for example by means of a leave 7A (FIG. 2) defining a flared inlet avoiding the separation of the air streams from the walls of the channels, tarpaulin side air 8.
  • these channels may have the desired length necessary for the establishment of air streams opening into the cylinder at a speed and a direction capable of generating the vortex.
  • the material used for the two half-casings 1A and 1B will be an aluminum alloy which, cast under pressure, will make it possible to obtain without modification the most varied shapes for the channels but, of course, the invention n is not limited to the use of this type of material.
  • the two half-casings 1A and 1B once assembled, together form the air cover 8 in which the compressor delivers.
  • This can interest the entire periphery of the engine, as in the example shown, or only part of it, and does not require any cover and gasket. Sealing also poses no particular problem, insofar as the cooling chamber 11 is limited to the upper half-casing 1A so as not to affect the assembly plane of the two half-casings and where the combustion chamber is delimited between the upper half-casing 1A, the piston 5 and the cylinder head 2, no joint is necessary between the two half-casings.
  • the invention is not limited to the embodiment described above.
  • a pressurized oil chamber can be provided in the lower half-casing 1B.
  • This also offers possibilities for appropriate lubrication of the jacket, the piston and the rings.
  • the invention can be applied to different modes of construction of two-stroke engines, whether they are with one or more cylinders, filled with a pump-caster or by compressor, with exhaust by lights or by valves. In all cases, the traditional lights being replaced by channels whose arrangement is without constraint, their shape, their section, their length, their number are no longer a function of machining possibilities and no longer hamper the designer in the search for the best flow.
  • the invention makes it possible to obtain industrially at the lowest cost all the scanning effects sought to improve the filling and therefore the efficiency of the motors.
  • it facilitates the obtaining of compact motors, mainly in the case where the sweeping is ensured by a compressor delivering in an air tank.

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)
  • Fuel-Injection Apparatus (AREA)
EP19830400944 1982-05-13 1983-05-10 Zweitaktbrennkraftmaschine mit Direkteinspritzung Expired EP0094872B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8208339A FR2526871B1 (fr) 1982-05-13 1982-05-13 Moteur a combustion interne a deux temps et a injection directe
FR8208339 1982-05-13

Publications (2)

Publication Number Publication Date
EP0094872A1 true EP0094872A1 (de) 1983-11-23
EP0094872B1 EP0094872B1 (de) 1986-02-19

Family

ID=9273999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830400944 Expired EP0094872B1 (de) 1982-05-13 1983-05-10 Zweitaktbrennkraftmaschine mit Direkteinspritzung

Country Status (4)

Country Link
EP (1) EP0094872B1 (de)
DE (1) DE3362160D1 (de)
ES (1) ES522314A0 (de)
FR (1) FR2526871B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE460884C (de) * 1927-06-11 1928-06-09 Maschf Augsburg Nuernberg Ag Zylinder fuer Zweitaktbrennkraftmaschinen
DE625796C (de) * 1934-03-24 1936-02-15 Buckau R Wolf Akt Ges Maschf Zylinderblock fuer mehrzylindrige Zweitaktbrennkraftmaschinen
DE759359C (de) * 1941-02-23 1954-10-11 Kloeckner Humboldt Deutz Ag Zylinder fuer Zweitaktbrennkraftmaschinen
GB1191572A (en) * 1967-03-21 1970-05-13 Fairbanks Morse Inc A Compression-Ignition Type Engine.
FR2183394A5 (de) * 1972-05-05 1973-12-14 Peugeot & Renault
FR2360757A1 (fr) * 1976-08-02 1978-03-03 Renault Structure de moteur a combustion interne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE460884C (de) * 1927-06-11 1928-06-09 Maschf Augsburg Nuernberg Ag Zylinder fuer Zweitaktbrennkraftmaschinen
DE625796C (de) * 1934-03-24 1936-02-15 Buckau R Wolf Akt Ges Maschf Zylinderblock fuer mehrzylindrige Zweitaktbrennkraftmaschinen
DE759359C (de) * 1941-02-23 1954-10-11 Kloeckner Humboldt Deutz Ag Zylinder fuer Zweitaktbrennkraftmaschinen
GB1191572A (en) * 1967-03-21 1970-05-13 Fairbanks Morse Inc A Compression-Ignition Type Engine.
FR2183394A5 (de) * 1972-05-05 1973-12-14 Peugeot & Renault
FR2360757A1 (fr) * 1976-08-02 1978-03-03 Renault Structure de moteur a combustion interne

Also Published As

Publication number Publication date
ES8402907A1 (es) 1984-02-16
ES522314A0 (es) 1984-02-16
EP0094872B1 (de) 1986-02-19
FR2526871A1 (fr) 1983-11-18
DE3362160D1 (en) 1986-03-27
FR2526871B1 (fr) 1985-06-21

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