EP0400338A2 - Dispositif pour varier la direction du courant du combustible dans un cylindre d'un moteur à combustion interne à deux temps - Google Patents

Dispositif pour varier la direction du courant du combustible dans un cylindre d'un moteur à combustion interne à deux temps Download PDF

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Publication number
EP0400338A2
EP0400338A2 EP90108198A EP90108198A EP0400338A2 EP 0400338 A2 EP0400338 A2 EP 0400338A2 EP 90108198 A EP90108198 A EP 90108198A EP 90108198 A EP90108198 A EP 90108198A EP 0400338 A2 EP0400338 A2 EP 0400338A2
Authority
EP
European Patent Office
Prior art keywords
engine
chamber
passage
cylinder
deflector means
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.)
Withdrawn
Application number
EP90108198A
Other languages
German (de)
English (en)
Other versions
EP0400338A3 (fr
Inventor
Andrea Goggi
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.)
CAGIVA MOTOR ITALIA SpA
Original Assignee
CAGIVA MOTOR ITALIA SpA
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 CAGIVA MOTOR ITALIA SpA filed Critical CAGIVA MOTOR ITALIA SpA
Publication of EP0400338A2 publication Critical patent/EP0400338A2/fr
Publication of EP0400338A3 publication Critical patent/EP0400338A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
    • 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
    • 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

  • This invention relates to an engine, in particular a two stroke motorcycle engine.
  • Such an engine comprises a normal cylinder, in the chamber of which the associated piston moves; the fuel in the form of air plus mixture, this latter comprising gasoline and oil, reaches said cylinder chamber through feed passages.
  • feed passages are known as transfer passages or induction passages according to whether the fuel reaches said chamber from the crankcase or directly from outside the engine.
  • the fuel feed is suitably directed into the cylinder or rather into its chamber by giving the feed passages a suitable fixed geometry to attain the required object.
  • This method involving a fixed geometry for said passages does not allow fuel feed into the cylinder chamber to be optimized as a function of the engine operating conditions (rotational speed and/or degree of accelerator opening). Consequently, good engine performance is obtained only for example for a certain engine speed or, more generally, for particular engine operating conditions.
  • An object of the present invention is therefore to provide an engine of improved performance compared with engines of the state of the art, and in particular an engine in which mixing between the fuel (or fresh gas) and the burnt gas present in the cylinder chamber is reduced to a minimum under any engine operating condition, ie for any rotational speed or for any degree of opening of the accelerator.
  • an engine in particular a two-stroke motorcycle engine of the stated type, characterised by comprising in at least one of the feed passages movable deflector means arranged to vary the geometry of said passage and to orientate the fuel jet within the cylinder chamber in such a manner as to enable said jet to urge the burnt gas towards the usual exhaust port provided in said cylinder, said deflector means being arranged on a wall of said feed passage in proximity to its entry into said chamber, the movement of said deflector means and thus the variation in the geometry of said passage being obtained as a function of the engine rotational speed and/or the the position of the piston within said chamber of engine cycle and/or the degree of opening of the accelerator.
  • a two-stroke engine comprises a cylinder 1 having a barrel 2 defining a chamber 3 in which a piston 4 moves.
  • the cylinder 1 comprises a usual burnt gas exhaust port 5 and a known induction port 6 for the fuel or fresh gas.
  • the feed passages 7 can derive either from the pump sump (not shown), in which case they are known as transfer passages, or (as in the illustrated example) from the induction port 6 connected to the environment external to the engine, in which case they are known as induction passages.
  • movable deflector means 8 arranged to modify the geometry of said passage and consequently to throttle it. In this manner a varying orientation of the fuel (or fresh gas) jet leaving said passage is obtained based on the position of the deflector means in said passage.
  • the deflector means 8 are at least one flexible blade 8A fixed at one end 9, mechanically or by adhesive, to the wall 10 of the feed passages (of only two passages 7A and 7B in the example) in a position corresponding with a seat 11 formed for example by milling.
  • Said blades 8A can be located either on the convex walls 10 of the passages 7 (as shown in the example) or on the concave walls 12 of these passages, or on the lateral walls of the passages.
  • blades are provided in each passage 7 such that when in the position which gives maximum passage opening they rest against the walls 10 of said passages or as close to them as they can reach.
  • the free end 13 of the blades 8A is in line with the port 14 in the wall 15 of the chamber 3 into which the passage 7 opens, but without projecting from this latter. This prevents the moving piston 4 being able to touch said end 13, with obvious resultant problems.
  • the fresh gas reaches the chamber 3 of the cylinder 1 by passing through the feed passages 7.
  • the said gas encounters the blades 8A and is directed by them into said chamber 3 in such a manner as to prevent its mixing with the burnt gas and facilitate discharge of the burnt gas through the exhaust port 5.
  • the fresh gas is therefore fed into said chamber with a certain inclination which is a function of the position of the blades 8A in the passages 7.
  • the blades 8A can automatically assume any position between the position corresponding to maximum passage opening (as described) and that corresponding to minimum passage opening. These positions (or inclinations) can also vary during the scavenging phase according to the instantaneous fresh gas flow through the passages 7. It can be generally stated that the higher the engine rotational speed the more the blades approach the position corresponding to maximum opening of the relative passage.
  • the various said positions are attained (as stated, automatically) as a function of the engine rotational speed and/or degree of opening of the accelerator, and of the position of the piston 4 in the cylinder chamber 3, and enable the fuel to be directed in the best possible manner into said chamber 3.
  • the burnt gas present in said chamber is discharged through the port 5 without mixing (or only to a very small extent) with the fresh gas, so enabling the engine to give high performance.
  • the blades 8A are arranged in the feed passages in such a manner as to move (and consequently direct the fresh gas) towards the upper end of the chamber 3 of the cylinder 1 or towards its wall 15. This further improves burnt gas discharge and prevents the fresh gas mixing with the exhaust during fresh gas feed into the chamber 3, so further increasing engine performance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP19900108198 1989-05-30 1990-04-29 Dispositif pour varier la direction du courant du combustible dans un cylindre d'un moteur à combustion interne à deux temps Withdrawn EP0400338A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8920686A IT1229378B (it) 1989-05-30 1989-05-30 Dispositivo per la variazione della direzione di afflusso di combustibile in un cilindro di un motore, in particolare a due tempi per motocicli.
IT2068689 1989-05-30

Publications (2)

Publication Number Publication Date
EP0400338A2 true EP0400338A2 (fr) 1990-12-05
EP0400338A3 EP0400338A3 (fr) 1991-03-27

Family

ID=11170568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900108198 Withdrawn EP0400338A3 (fr) 1989-05-30 1990-04-29 Dispositif pour varier la direction du courant du combustible dans un cylindre d'un moteur à combustion interne à deux temps

Country Status (2)

Country Link
EP (1) EP0400338A3 (fr)
IT (1) IT1229378B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507648A1 (fr) * 1991-04-03 1992-10-07 Institut Français du Pétrole Moteur à deux temps à contrôle sélectif de la charge introduite dans la chambre de combustion
EP0578894B1 (fr) * 1992-07-16 1996-04-17 New Sulzer Diesel Ag Insertion d'un cylindre pour un moteur à combustion interne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE719509C (de) * 1938-08-20 1942-04-10 Brennabor Werke Ag Zweitaktbrennkraftmaschine
DE849034C (de) * 1950-06-23 1952-09-11 Kloeckner Humboldt Deutz Ag Zylinder fuer Zweitaktbrennkraftmaschinen
DE760778C (de) * 1943-03-05 1953-09-14 Hermann Dr-Ing Foettinger Duesenbefestigung fuer Zweitakt-Brennkraftmaschinen
US4549507A (en) * 1984-09-19 1985-10-29 Brunswick Corp. Two cycle loop scavenged engine with improved transfer passage flow

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE719509C (de) * 1938-08-20 1942-04-10 Brennabor Werke Ag Zweitaktbrennkraftmaschine
DE760778C (de) * 1943-03-05 1953-09-14 Hermann Dr-Ing Foettinger Duesenbefestigung fuer Zweitakt-Brennkraftmaschinen
DE849034C (de) * 1950-06-23 1952-09-11 Kloeckner Humboldt Deutz Ag Zylinder fuer Zweitaktbrennkraftmaschinen
US4549507A (en) * 1984-09-19 1985-10-29 Brunswick Corp. Two cycle loop scavenged engine with improved transfer passage flow

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507648A1 (fr) * 1991-04-03 1992-10-07 Institut Français du Pétrole Moteur à deux temps à contrôle sélectif de la charge introduite dans la chambre de combustion
FR2674906A1 (fr) * 1991-04-03 1992-10-09 Inst Francais Du Petrole Moteur a deux temps a controle selectif de la charge introduite dans la chambre de combustion.
US5285753A (en) * 1991-04-03 1994-02-15 Institut Francais Du Petrole Two-stroke engine with selective control of the charge introduced in the combustion chamber
EP0578894B1 (fr) * 1992-07-16 1996-04-17 New Sulzer Diesel Ag Insertion d'un cylindre pour un moteur à combustion interne

Also Published As

Publication number Publication date
IT1229378B (it) 1991-08-08
IT8920686A0 (it) 1989-05-30
EP0400338A3 (fr) 1991-03-27

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