EP0272646A2 - Zweitaktbrennkraftmaschine - Google Patents

Zweitaktbrennkraftmaschine Download PDF

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Publication number
EP0272646A2
EP0272646A2 EP87118825A EP87118825A EP0272646A2 EP 0272646 A2 EP0272646 A2 EP 0272646A2 EP 87118825 A EP87118825 A EP 87118825A EP 87118825 A EP87118825 A EP 87118825A EP 0272646 A2 EP0272646 A2 EP 0272646A2
Authority
EP
European Patent Office
Prior art keywords
protuberances
exhaust port
exhaust
port
internal combustion
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
EP87118825A
Other languages
English (en)
French (fr)
Other versions
EP0272646B1 (de
EP0272646A3 (en
Inventor
Umberto Panzeri
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.)
Dott Vittorio Gilardoni SpA
Original Assignee
Dott Vittorio Gilardoni 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 Dott Vittorio Gilardoni SpA filed Critical Dott Vittorio Gilardoni SpA
Priority to AT87118825T priority Critical patent/ATE73901T1/de
Publication of EP0272646A2 publication Critical patent/EP0272646A2/de
Publication of EP0272646A3 publication Critical patent/EP0272646A3/en
Application granted granted Critical
Publication of EP0272646B1 publication Critical patent/EP0272646B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 appertain to the technical sector of the motor construction industry and refers to an exhaust port for the combustion chamber of a two-stroke internal combustion engine.
  • the presence in them of low-pressure areas around the exhaust helps the expulsion of the combustion gases from the cylinder, reducing the back-pressure. This is how the performance of the engine is improved: the amount of pumping work required to clear the exhaust gases is reduced.
  • a second proposal consists in having at least one vertical central crosspiece across the exhaust port, so that there are two openings in the cylinder wall, which afterwards come together in an single exhaust pipe (Figs. 3 and 4).
  • This solution despite being adopted in competition engines, is no longer mass produced. Indeed, it is still possible for the piston to seize on the crosspiece, because the latter is subjected to very high temperatures and is also subjected to a thermal gradient along the line of the cylinder, since there are higher temperatues in the upper part of the cylinder than in the lower. This causes a difference in expansion and therefore a deformation of the crosspiece, which can cause seizure.
  • FIGs. 5 and 6 Another solution (Figs. 5 and 6) consists in the use of lateral boosters which connect with the exhaust trunk through appropriate channeling.
  • the exhaust port is enlarged exactly where it is necessary, in the upper part of the exhaust, avoiding or mitigating the negative effects of the thermal gradient and getting, as was described, an increase in the performance of the engine.
  • that solution looks positive, there are limits from another point of view because a complicated core for the exhaust would have to be made in special sand, and a particular and expensive mould would have to be made for the casting of the block.
  • the principal aim of the present invention is to provide an exhaust port which will structurally enlarge the exhausting of the chamber of cylinders of two-stroke engines, without causing difficulties to mass production and without the risk of the piston seizing or the piston rings breaking, and guaranteeing high performance to any regime.
  • the invention could eliminate the ring stop-pins used up to now in the traditional pistons to prevent the rings from turning and entering the exhaust port.
  • an exhaust port for two-stroke internal combustion engines characterized in that it comprises one or more overhanging protuberances, which descend and/or rise from the edge of the exhaust port, giving the same a "V” or “W” or multiple side-by-­side “V” shape, the protuberances extending above and below an ideal line from which the port increases upwards.
  • the desired enlargement of the exhaust port is obtained, especially in the upper part, guaranteeing sufficient support to the piston rings, because the apertures of the individual openings thus created are limited, as are the spaces between the edges and the protuberances.
  • the sidewalls 20 of a cylinder of a two-­stroke internal combustion engine have an exhaust port, 22 which, when developed on the flat, shows roughly as a "T", with a foot 24 and arms 26 which extend over the foot 24 and which are bounded above by the line 28 and below by the line 30 of the foot opening.
  • an exhaust port 22 which, when developed on the flat, shows roughly as a "T"
  • a foot 24 and arms 26 which extend over the foot 24 and which are bounded above by the line 28 and below by the line 30 of the foot opening.
  • protuberances 32 one in the case of Figs. 7 and 8, two or more in Figs. 9 - 14
  • protuberances 34 are provided extending from below to above, giving the port the appearance of "W" or multiple side-by-side "V"s.
  • the lower protuberances 34 rise to above the line 30 in such a way that there is continuity of support for the piston ring so that when, on its downward stroke, it leaves the support of the two upper protuberances it is already bearing against the lower, and vice versa in the ascending stroke. There is a moment when each ring is touching all the protuberances. Also in the cases of Figs. 11 and 12, there is always continuity of movement of the rings and piston on the upper and lower protuberances, so that the rings themselves do not enter the port.
  • Figs.13 and 14 correspond to that of Figs. 9 and 10 but without the lower protuberance.

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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP87118825A 1986-12-23 1987-12-18 Zweitaktbrennkraftmaschine Expired - Lifetime EP0272646B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118825T ATE73901T1 (de) 1986-12-23 1987-12-18 Zweitaktbrennkraftmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2283386 1986-12-23
IT8622833A IT8622833A0 (it) 1986-12-23 1986-12-23 Luce di scarico per motori a scoppio a due tempi

Publications (3)

Publication Number Publication Date
EP0272646A2 true EP0272646A2 (de) 1988-06-29
EP0272646A3 EP0272646A3 (en) 1989-05-24
EP0272646B1 EP0272646B1 (de) 1992-03-18

Family

ID=11200971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118825A Expired - Lifetime EP0272646B1 (de) 1986-12-23 1987-12-18 Zweitaktbrennkraftmaschine

Country Status (5)

Country Link
EP (1) EP0272646B1 (de)
AT (1) ATE73901T1 (de)
DE (1) DE3777573D1 (de)
ES (1) ES2030704T3 (de)
IT (1) IT8622833A0 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007035025A1 (de) 2007-07-26 2009-01-29 Docter Optics Gmbh Verfahren zum Herstellen einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
DE102007037204A1 (de) 2007-08-07 2009-02-26 Docter Optics Gmbh Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
DE102007049835A1 (de) 2007-10-18 2009-04-23 Docter Optics Gmbh Verfahren zum Herstellen einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
DE102011100071A1 (de) 2011-04-29 2012-10-31 Docter Optics Gmbh Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
US8556482B2 (en) 2007-07-26 2013-10-15 Docter Optics Se Method for producing a headlamp lens for a motor-vehicle headlamp
DE102012020378A1 (de) 2012-10-18 2014-04-24 Docter Optics Se Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
WO2014072002A1 (de) 2012-11-09 2014-05-15 Docter Optics Se Verfahren zum herstellen eines optischen linsenelementes, insbesondere einer scheinwerferlinse für einen kraftfahrzeugscheinwerfer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB409246A (en) * 1933-12-06 1934-04-26 Henry Kent Norris Improvements in or relating to the cylinders of internal combustion engines
DE849034C (de) * 1950-06-23 1952-09-11 Kloeckner Humboldt Deutz Ag Zylinder fuer Zweitaktbrennkraftmaschinen
US3398728A (en) * 1965-08-06 1968-08-27 James A. Hardman Two piston sleeve port engine
DE3430477A1 (de) * 1984-08-04 1986-02-13 Sachs Systemtechnik Gmbh, 8720 Schweinfurt Schnellaufende zweitakt-brennkraftmaschine mit kurbelkastenspuelung

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007035025A1 (de) 2007-07-26 2009-01-29 Docter Optics Gmbh Verfahren zum Herstellen einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
US8556482B2 (en) 2007-07-26 2013-10-15 Docter Optics Se Method for producing a headlamp lens for a motor-vehicle headlamp
DE102007037204A1 (de) 2007-08-07 2009-02-26 Docter Optics Gmbh Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
DE102007049835A1 (de) 2007-10-18 2009-04-23 Docter Optics Gmbh Verfahren zum Herstellen einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
DE102011100071A1 (de) 2011-04-29 2012-10-31 Docter Optics Gmbh Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
WO2012146328A1 (de) 2011-04-29 2012-11-01 Docter Optics Gmbh Verfahren zum herstellen eines optischen linsenelementes, insbesondere einer scheinwerferlinse für einen kraftfahrzeugscheinwerfer
DE102012020378A1 (de) 2012-10-18 2014-04-24 Docter Optics Se Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
WO2014060058A1 (de) 2012-10-18 2014-04-24 Docter Optics Se Verfahren zum herstellen eines optischen linsenelementes, insbesondere einer scheinwerferlinse für einen kraftfahrzeugscheinwerfer
US9421718B2 (en) 2012-10-18 2016-08-23 Docter Optics Se Process for manufacturing a headlight lens
WO2014072002A1 (de) 2012-11-09 2014-05-15 Docter Optics Se Verfahren zum herstellen eines optischen linsenelementes, insbesondere einer scheinwerferlinse für einen kraftfahrzeugscheinwerfer
DE102012021921A1 (de) 2012-11-09 2014-05-15 Docter Optics Se Verfahren zum Herstellen eines optischen Linsenelementes, insbesondere einer Scheinwerferlinse für einen Kraftfahrzeugscheinwerfer
US9358734B2 (en) 2012-11-09 2016-06-07 Docter Optics Se Method for manufacturing a headlight lens for a vehicle headlight

Also Published As

Publication number Publication date
EP0272646B1 (de) 1992-03-18
ATE73901T1 (de) 1992-04-15
ES2030704T3 (es) 1992-11-16
DE3777573D1 (de) 1992-04-23
IT8622833A0 (it) 1986-12-23
EP0272646A3 (en) 1989-05-24

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