EP0013004A1 - Zweitaktmotor mit getrennten Einlasskanälen und Plattenventil hierzu - Google Patents

Zweitaktmotor mit getrennten Einlasskanälen und Plattenventil hierzu Download PDF

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Publication number
EP0013004A1
EP0013004A1 EP79105290A EP79105290A EP0013004A1 EP 0013004 A1 EP0013004 A1 EP 0013004A1 EP 79105290 A EP79105290 A EP 79105290A EP 79105290 A EP79105290 A EP 79105290A EP 0013004 A1 EP0013004 A1 EP 0013004A1
Authority
EP
European Patent Office
Prior art keywords
engine
reed
ducts
cylinder
duct
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Withdrawn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
EP79105290A
Other languages
English (en)
French (fr)
Inventor
Alessandro Bianchi
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.)
Hiro Motori Sas Di Andrea Mosconi & C
Original Assignee
Hiro Motori Sas Di Andrea Mosconi & C
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 Hiro Motori Sas Di Andrea Mosconi & C filed Critical Hiro Motori Sas Di Andrea Mosconi & C
Publication of EP0013004A1 publication Critical patent/EP0013004A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • F01L3/205—Reed valves
    • 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/04—Engines with reciprocating-piston pumps; Engines with crankcase pumps with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase
    • 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/28—Component parts, details or accessories of crankcase pumps, not provided for in, or of interest apart from, subgroups F02B33/02 - F02B33/26
    • F02B33/30—Control of inlet or outlet ports
    • 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 a combined or mixed intake two-stroke engine (i.e. an engine with intake by piston valve and reed valve comprising a first duct for direct intake sf the mixture into the cylinder chamber and one or more additional ducts for intake by reeds.
  • a combined or mixed intake two-stroke engine i.e. an engine with intake by piston valve and reed valve comprising a first duct for direct intake sf the mixture into the cylinder chamber and one or more additional ducts for intake by reeds.
  • Such engines are used, for example, in the motorcycle environment, but also for industrial engines, as engines for motarsaws, small tractors, etc.
  • the invention also relates to a reed valve for mixed intake two-stroke engine of the type above set forth.
  • a prior art engine of mixed intake system type has an intake duct branching off in the engine cylinder; a first branch thereof directly enters the cylinder chamber; and the second branch diverges from the first branch and terminates in the engine block; a reed valve is placed on this second branch.
  • This known engine has the disadvantage that the intake system also involves the engine block, which is a highly costly part; accordingly, as a whole the engine is remarkably expensive.
  • Engines are also known that use only one (and accordingly not mixed) type of intake through reed valves; particularly, they have the reed valve(s) interposed on a single intake duct and the whole intake occurs through the reeds. These engines have the disadvantage of a not high filling degree at low r.p.m. due to the impediment to the passage of the sucked-in flow caused by the resistance to the opening of the obturating reeds.
  • the engine comprises one or more additional intake ducts provided in the cylinder and opening into the cylinder transfer ducts.
  • additional ducts are branches of the usual duct, and according to a further preferred feature of the invention a seat is formed at the branching location for a reed valve or "reed holder" which also forms part of the invention.
  • the valve has a first free passage intended to be placed at said intake duct and one or more additional passages provided with flow regulating reeds intended to be placed at said additonal ducts.
  • this reed holder or reed support is of a tapered shape, such as a frustrum of pyramid having four or more sides, wherein the first passage is axial, while the other passages are provided on one or more faces or sides of the pyramid.
  • This novel engine and reed holder structure allows without any changes to use blocks already in use for other types f engines and enables to provide a mixed intake type of engine of easier construction and reduced cost relative to such engines at present commercially available under same performances.
  • a two-stroke engine 10 comprises a cylinder 11, at the top closed by a cylinder head 12, and a piston 13. Both said cylinder 11 and head 12 are shown as provided in a known manner with cooling fins 11' and 12', respectively.
  • the head 12 has a bore 14 for a sparking plug (not shown).
  • the cylinder is internally provided with a liner 15 defining an inner chamber 16 having said piston 13 sliding therein.
  • an exhaust duct 18 and an intake or suction duct 19 which may be of any known configuration, for example (Fig. 2) branching off to open into the cylinder chamber in two separate ports 19'.
  • Cylinder 11 is secured to a block 20 forming a crankcase-pump assembly 21.
  • the chamber of this crankcase-pump assembly 21 communicates with said cylinder chamber 12 through transfer ducts 24 opening by transfer ports 25 into the power stroke chamber of the cylinder.
  • the connecting rod of the piston is shown at 27 and drives the driving shaft shown at 28.
  • Reference numeral 30 designates a carburettor of any known suitable type
  • reference numeral 31 designates a resilient mount for the carburettor, which mount is also of known type.
  • one or more (two in this embodiment) additional intake ducts 40 and 41 have been provided in cylinder 11, and branch off from the primary duct 19 and, in this case, each open into a transfer duct 24.
  • a seat 42 is provided for a reed holder or reed valve 50, forming a further feature of the present invention and which will now be described.
  • This reed valve 50 comprises a body 51 which in the preferred embodiment, is in the shape of a frustrum of pyramid having four sides, but which could be of any number of sides, or could be in the shape of a frustrum of cone having one or more flattened sides.
  • Said body 51 has a through aperture or free axial passage 52, and on one or more sides has further apertures or passages 54 provided with resilient reed shutters 54.
  • said body member 51 has apertures 54 on two opposite sides, the apertures being in number of two on each side.
  • the reeds 55 are of well known type and are provided with rigid opening limiting devices or stoppers 56, each reed and relevant stopper being secured to said body member 51 by a fastening means 57.
  • the reed valve is also provided with a flange 58 or other means for attachment to the cylinder and may be provided with a tubular extension for attachment to the carburettor mount, if desired.
  • the valve may be made of metal material and provided with seals 59 on one or more walls, for example in rubber injection.
  • valve shown in Fig. 3 is suitable for mounting on an engine as that in Figs. 1 and 2.
  • the free axial passage 52 of the valves is arranged at the cylinder intake duct 19, while the additional passages 54 of the valve, provided with reed shutter, are arranged at additional intake ducts 40 and 41. Accordingly, the engine operates by mixed intake.
  • FIG. 4 A further exemplary embodiment of a reed valve according to the present application is shown in Fig. 4, while the embodiment of the engine on which such a valve is mounted is shown in Figs. 5 and 6.
  • the reed valve 150 has a body member 151 of frustrum of pyramid shape with free axial passage 152 and additional passages or apertures 154 on the four sides, provided with reed shutter 155 and opening limiting devices 156.
  • the other elements of valve 150 do not substantially differ from the corresponding elements of valve 50, and will not be described in detail.
  • the engine 110 of this second embodiment comprises elements similar to those of engine 10 of the first embodiment, and the similar elements are shown in Figs. 5 and 6 with the same reference numerals of Figs. 1 and 2 added by 100, and will not be described in detail.
  • the cylinder 111 of engine 110 has provided therein a first intake duct 119, and additional intake ducts 140 and 141 shown in Fig. 6, and 144 and 145 shown in Fig. 5. While said first intake duct 119 is supplied through the free passage 152 of the valve, the other ducts 140, . 141, 144 and 145 are supplied through the reeded apertures 154. It will be seen that while ducts 140 and 141 open into the cylinder transfer ducts, ducts 144 and 145 directly open into the chamber defined by the cylinder liner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Supercharger (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Check Valves (AREA)
EP79105290A 1978-12-29 1979-12-20 Zweitaktmotor mit getrennten Einlasskanälen und Plattenventil hierzu Withdrawn EP0013004A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT31414/78A IT1101700B (it) 1978-12-29 1978-12-29 Motore a due tempi, a sistema di aspirazione misto,con condotti di aspirazione realizzati nel cilindro, e valvola a lamelle relativa
IT3141478 1978-12-29

Publications (1)

Publication Number Publication Date
EP0013004A1 true EP0013004A1 (de) 1980-07-09

Family

ID=11233603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79105290A Withdrawn EP0013004A1 (de) 1978-12-29 1979-12-20 Zweitaktmotor mit getrennten Einlasskanälen und Plattenventil hierzu

Country Status (4)

Country Link
EP (1) EP0013004A1 (de)
JP (1) JPS55101723A (de)
ES (1) ES487363A1 (de)
IT (1) IT1101700B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303496A1 (de) * 1993-02-06 1994-08-11 Christian Bartsch Zweitakt-Brennkraftmaschine
WO1998017907A1 (es) * 1996-10-22 1998-04-30 Torralba Gimeno Cesar Compensador de vacio para motores de explosion

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH139275A (de) * 1929-04-15 1930-04-15 Sulzer Ag Zweitaktbrennkraftmaschine.
CH163645A (de) * 1932-05-12 1933-08-31 Thomann Robert Doppeltwirkende Zweitaktverbrennungskraftmaschine.
DE585407C (de) * 1930-09-25 1933-10-04 Sulzer Akt Ges Geb Doppelt wirkende Zweitaktbrennkraftmaschine
DE800450C (de) * 1948-10-02 1950-11-06 Otto Dr-Ing Lutz Brennstoffeinspritzpumpe fuer Zweitaktmotoren
US2782777A (en) * 1953-09-01 1957-02-26 Elmer P Jasper Internal combustion engines
DE1949560A1 (de) * 1968-10-11 1970-06-04 British Oxygen Co Ltd Selbsttaetiges Absperrventil
DE2833677A1 (de) * 1977-08-22 1979-03-01 Motobecane Ateliers Zweitakt-brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5240261U (de) * 1975-09-09 1977-03-22
JPS5731715Y2 (de) * 1977-05-13 1982-07-12

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH139275A (de) * 1929-04-15 1930-04-15 Sulzer Ag Zweitaktbrennkraftmaschine.
DE585407C (de) * 1930-09-25 1933-10-04 Sulzer Akt Ges Geb Doppelt wirkende Zweitaktbrennkraftmaschine
CH163645A (de) * 1932-05-12 1933-08-31 Thomann Robert Doppeltwirkende Zweitaktverbrennungskraftmaschine.
DE800450C (de) * 1948-10-02 1950-11-06 Otto Dr-Ing Lutz Brennstoffeinspritzpumpe fuer Zweitaktmotoren
US2782777A (en) * 1953-09-01 1957-02-26 Elmer P Jasper Internal combustion engines
DE1949560A1 (de) * 1968-10-11 1970-06-04 British Oxygen Co Ltd Selbsttaetiges Absperrventil
DE2833677A1 (de) * 1977-08-22 1979-03-01 Motobecane Ateliers Zweitakt-brennkraftmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303496A1 (de) * 1993-02-06 1994-08-11 Christian Bartsch Zweitakt-Brennkraftmaschine
WO1998017907A1 (es) * 1996-10-22 1998-04-30 Torralba Gimeno Cesar Compensador de vacio para motores de explosion
ES2136006A1 (es) * 1996-10-22 1999-11-01 Torralba Gimeno Cesar Compensador de vacio para motores de explosion.

Also Published As

Publication number Publication date
IT7831414A0 (it) 1978-12-29
IT1101700B (it) 1985-10-07
ES487363A1 (es) 1980-09-16
JPS55101723A (en) 1980-08-04

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE DE FR GB NL SE

17P Request for examination filed

Effective date: 19801208

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19820830

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BIANCHI, ALESSANDRO