EP0217374B1 - Groupe piston-cylindre d'un moteur à combustion interne à deux temps - Google Patents

Groupe piston-cylindre d'un moteur à combustion interne à deux temps Download PDF

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Publication number
EP0217374B1
EP0217374B1 EP86113495A EP86113495A EP0217374B1 EP 0217374 B1 EP0217374 B1 EP 0217374B1 EP 86113495 A EP86113495 A EP 86113495A EP 86113495 A EP86113495 A EP 86113495A EP 0217374 B1 EP0217374 B1 EP 0217374B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
grooves
casing
cavities
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.)
Expired - Lifetime
Application number
EP86113495A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0217374A1 (fr
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 AT86113495T priority Critical patent/ATE50318T1/de
Publication of EP0217374A1 publication Critical patent/EP0217374A1/fr
Application granted granted Critical
Publication of EP0217374B1 publication Critical patent/EP0217374B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • 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 invention relates to two-stroke internal combustion engines and relates to a piston-cylinder group which makes it possible to increase the performance of said engines while keeping an unchanged displacement and without making any modification to the casing.
  • the group according to the invention can be used in two-stroke engines with suction of the usual type, with lamellar suction in the casing and / or in the cylinder, with rolling valve suction, or with suction regulated by any device.
  • the fresh gases coming from the casing undergo abrupt deviations from the fact that they must pass from a substantially axial direction, when they are pushed towards the inside of the piston, to a radial direction, when they pass through the small windows formed in the envelope of the piston, and then again in an axial direction when they flow along said cavities and finally again in a substantially radial direction when they reach the upper end of the cavities and there are sent to the explosion chamber.
  • US-A-4,294 2 and FR-A-2,240,411 provide cavities, grooves, or grooves formed longitudinally in the cylinder liner, which directly connect the interior of the motor housing with its explosion chamber for positions of the piston located near its bottom dead center.
  • the longitudinal cavities formed in the separation surface of the piston-cylinder group increase the dead volume of the housing.
  • the object of the present invention is therefore to improve the sweeping conditions of a two-stroke engine without causing it to increase the dead volume of the casing, with measures which can be adopted even in an already built and operating engine, without modify the casing.
  • a piston-cylinder group of a two-stroke internal combustion engine comprising first cavities or grooves formed longitudinally in the cylinder liner, which directly connect the interior of the engine casing with its explosion chamber for positions of the piston located near its lower dead center, characterized in that these first grooves cooperate with second grooves (or cavities) formed longitudinally in the envelope of the piston in correspondence with the grooves of the cylinder, so as to constitute, together, conduits or passages which are intended to ensure the sweeping of the explosion chamber of the engine and which do not involve any main gas supply passage, said second grooves being understood from the lower edge of said envelope up to below the seats intended for accommodation elastic piston rings.
  • the scanning conditions of the cylinder are improved while leaving the value of the dead volume of the casing substantially unchanged.
  • the creation of cavities in the external envelope of the piston necessarily resulting in a reduction in its internal volume, causes a reduction in the dead volume of the casing.
  • the creation of cavities in the piston is accompanied by a reduction in said volume and the sum of these two effects gives as result keeping the value of the dead volume of the casing constant or decreasing it, the fresh gas passage section gained being equal.
  • the piston-cylinder group according to the invention makes it possible to improve the conditions for sweeping the cylinder while leaving the value of the dead volume of the casing unchanged or even by decreasing it.
  • the piston-cylinder group according to the invention makes it possible to increase the performance of two-stroke engines without this resulting in the need to modify the crankcase of the engine itself, in fact, to increase the performance of the engine simply replace the original piston-cylinder group with the group produced according to the invention.
  • the cylinder 1 illustrated is intended for an air-cooled engine with lamellar suction in the casing.
  • Said cylinder 1 comprises a plurality of cooling fins 2, a jacket 3, a series of axial holes 4 for the passage of the engine cylinder mounting screws, a main exhaust duct 5, with two secondary exhaust ducts 5 'next, and a couple of main passages 6 opening into the jacket 3 through windows 8.
  • a longitudinal cavity 7 is formed in a manner known per se, on the side opposite to the main exhaust duct 5 and central position relative to the windows 8 of the main passages.
  • Said cavity extends downward from a point substantially aligned with the upper edge of the windows 8 of the main passages to a point placed below the piston top but above the lower edge of the piston jacket when the latter is at its bottom dead center.
  • the cavity 7 is therefore not directly connected to the casing but, as will be explained below, its only function is to send a portion of the fresh gases which will fill the internal volume of the piston into the explosion chamber from the housing.
  • the piston 11 illustrated comprises a casing 12, a top 13, a seat 14 for housing a sealing segment, a radial passage hole 15 for housing the ends of an axis of piston.
  • a small window 16 has been made, in known manner, intended to align with the cavity 7 formed in the jacket of the cylinder 1. Through the small window 16, when the piston is located near its lower dead center, part of the fresh gas passes from the interior of the piston itself to the cavity 7 and from the latter to the explosion chamber.
  • the casing 12 of the piston has a pair of longitudinal cavities 17 extending from the lower edge 18 of the casing to the underside of the seat 14 for housing the sealing segment.
  • FIG. 6, illustrating the piston 11 inserted in the cylinder 1, shows how the cavities 17 formed in the casing of the piston align with the longitudinal cavities 9 formed in the jacket of the cylinder 1 by creating conduits 19.
  • FIG. 6 shows how the cavities 17 formed in the casing of the piston align with the longitudinal cavities 9 formed in the jacket of the cylinder 1 by creating conduits 19.
  • the fresh gases leaving the cavities 19, having an upwardly directed movement component contribute to directing upwards the fresh gases leaving the windows 8 of the main passages, by increasing the length of their course so that the piston has time to close the exhaust port before they can flow through said port.
  • FIG. 7 shows the linear development of a cylinder intended for an engine with four main passages and with the suction in the casing controlled by lamellae.
  • FIG. 10 illustrates a cross section made at the right of the windows of the main passages of the cylinder of FIG. 7 in combination with the piston according to the invention.
  • the cavities 21, formed in the cylinder liner and in communication with the casing align with the corresponding cavities 23 formed in the casing of the piston 24 to form conduits 25.
  • the cylinder which has just been described is intended for an engine with lamellar aspiration in the casing, it is also possible to provide it for two-stroke engines with lamellar aspiration in the cylinder, with rolling valve or with n ' any other suction control device.
  • the cylinder 26 has four windows 27 of the main passages, an exhaust duct 28, and a suction duct 29.
  • three longitudinal cavities have also been made, including the central cavity 30 n ' is not connected to the housing and the lateral cavities 31 are in communication with the housing.
  • FIG. 11 which is a section made in line with the windows of the main passages of the cylinder in FIG. 8, in combination with the piston according to the invention, the cavities 31 on the cylinder liner and the cavities 32 on the envelope of the piston 33 form conduits 34 connected to the casing.
  • Said conduits 34 in addition to their function of additional passages, also have the function of additional conduits for supplying fresh gas to the casing.
  • Figure 9 shows a cylinder substantially similar to the cylinder illustrated in Figure 8, except that the three longitudinal cavities 35 formed in the jacket are in communication with the housing.
  • Figure 12 is a section taken on the central line of the suction duct of the cylinder of Figure 9 in combination with the piston according to the invention.
  • FIG. 13 shows a detail of the piston-cylinder separation surface of another possible embodiment according to the invention.
  • the reference 36 indicates the cylinder liner and 37 is a longitudinal cavity formed in the liner itself.
  • the upper edge of said cavity is substantially in line with the upper edges of the windows of the main passages, while the lower edge is located near the lower dead center of the piston.
  • Said cavity 37 is not in communication with the casing.
  • the envelope of piston 38 shows a longitudinal cavity 39, quite similar to the cavities made in the piston illustrated in Figures 4 and 5, which aligns with the cavity 37 made in the envelope.

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)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)
EP86113495A 1985-10-02 1986-10-01 Groupe piston-cylindre d'un moteur à combustion interne à deux temps Expired - Lifetime EP0217374B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113495T ATE50318T1 (de) 1985-10-02 1986-10-01 Kolben-zylinder einheit einer zweitaktbrennkraftmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT22334/85A IT1185972B (it) 1985-10-02 1985-10-02 Metodo per aumentare le prestazioni dei motori a combustione interna a due tempi
IT2233485 1985-10-02

Publications (2)

Publication Number Publication Date
EP0217374A1 EP0217374A1 (fr) 1987-04-08
EP0217374B1 true EP0217374B1 (fr) 1990-02-07

Family

ID=11194825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113495A Expired - Lifetime EP0217374B1 (fr) 1985-10-02 1986-10-01 Groupe piston-cylindre d'un moteur à combustion interne à deux temps

Country Status (7)

Country Link
EP (1) EP0217374B1 (enrdf_load_stackoverflow)
AT (1) ATE50318T1 (enrdf_load_stackoverflow)
DE (1) DE3668943D1 (enrdf_load_stackoverflow)
ES (1) ES2013701B3 (enrdf_load_stackoverflow)
FR (1) FR2588043B1 (enrdf_load_stackoverflow)
IN (1) IN164255B (enrdf_load_stackoverflow)
IT (1) IT1185972B (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645207B1 (fr) * 1989-04-04 1991-07-19 Racing Kart Dev Ste Nl Moteur a combustion interne a cycle deux temps
DE102011085476A1 (de) 2011-10-28 2013-05-02 Ks Kolbenschmidt Gmbh Funktionsoptimierte Gestaltung einer Zylinderlaufbuchse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2449368A1 (de) * 1973-10-18 1975-04-24 Halder Engines Ltd Zweitakt-verbrennungskraftmaschine
US4294202A (en) * 1978-09-12 1981-10-13 Performance Industries, Inc. Fuel porting for two cycle internal combustion engine
JPS5813073Y2 (ja) * 1979-03-28 1983-03-14 川崎重工業株式会社 ２サイクルエンジンの掃気装置

Also Published As

Publication number Publication date
ATE50318T1 (de) 1990-02-15
IT8522334A0 (it) 1985-10-02
FR2588043B1 (fr) 1989-07-28
IN164255B (enrdf_load_stackoverflow) 1989-02-11
IT1185972B (it) 1987-11-18
FR2588043A1 (fr) 1987-04-03
ES2013701B3 (es) 1990-06-01
DE3668943D1 (de) 1990-03-15
EP0217374A1 (fr) 1987-04-08

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