WO2003002858A1 - Moteur a deux temps - Google Patents

Moteur a deux temps Download PDF

Info

Publication number
WO2003002858A1
WO2003002858A1 PCT/CN2001/001066 CN0101066W WO03002858A1 WO 2003002858 A1 WO2003002858 A1 WO 2003002858A1 CN 0101066 W CN0101066 W CN 0101066W WO 03002858 A1 WO03002858 A1 WO 03002858A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
stroke engine
engine according
valve
Prior art date
Application number
PCT/CN2001/001066
Other languages
English (en)
Inventor
Bor Hung
Original Assignee
Bor Hung
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 Bor Hung filed Critical Bor Hung
Priority to PCT/CN2001/001066 priority Critical patent/WO2003002858A1/fr
Publication of WO2003002858A1 publication Critical patent/WO2003002858A1/fr

Links

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
    • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • F02B25/04—Engines having ports both in cylinder head and in cylinder wall 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
    • F02B25/14—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
    • F02B25/24—Inlet or outlet openings being timed asymmetrically relative to bottom dead-centre
    • 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 engines.
  • Two-stroke internal combustion engines are well-known and widely used.
  • the main attraction is tha the inlet and exhaust valves have no moving parts.
  • Valving is achieved by a cylinder head of a reciprocating engine piston closing off inlet and exhaust ports provided in a side wall of the cylinder.
  • two-stroke engines have many mechanical advantages due to their simple valving arrangement, that require no valve seatings or valve operating cam shafts and timing chains for example, the engines are very inefficient in their use of fuel.
  • the two-stroke engines also lack power efficiency which is due to an inherent ability to be able to carefully control fuel intake and due to poor scavenging of burnt gases from the cylinder after each power stoke.
  • a two stroke engine having a piston mounted to reciprocate in a cylinder, an inlet port and an exhaust port in a wall of the cylinder that are cyclically exposed and closed off by the piston during each operational cycle of the engine, in which during each compression stroke the exhaust port is arranged so as to be closed off by the piston before the inlet port is closed off, and a valve for controlling a supply of pressurised fuel-air mixture connected to the inlet port.
  • the valve may be controlled to open in stages.
  • the fuel -air mixture is preferably directed towards a top end of the cylinder above the piston to purge exhaust gas from the top of the cylinder and out of the outlet port .
  • the fuel-air mixture may be directed towards a top end of the cylinder above the piston during initial stages of opening of the valve .
  • the valve may be a rotary valve.
  • Each cylinder may have two inlet ports and one exhaust port .
  • the outlet port may be positioned in a plane that vertically bisects the cylinder and the inlet ports positioned opposite the outlet port on either side of the central plane.
  • the two stroke engine may include a zig-zag rod arrangement of rods, each rod being mounted to rotate in a cylinder block, wherein the rods are shaped opposite the inlet ports to form the rotary valves .
  • the piston may comprise a cylindrical body that freely and slidingly fits in the cylinder, an eccentric cam being mounted on a crank shaft that bears against a lower surface of the piston to move the piston upwards and be pushed by the piston, when it is driven downwards during each power stroke, to rotate the crank shaft.
  • the piston may be made of solid graphite material.
  • the fuel and air may be supplied to each inlet port via separate passages.
  • Figures 1 to 6 show a piston and a cylinder of the engine in various relative positions during a complete operational cycle of the engine.
  • Figure 7 is a schematic elevation of another two stroke engine .
  • Figure 8 is a schematic elevation of a further two stroke engine.
  • Figure 9 is a schematic elevation of a two stroke engine similar to the engine of Figure 8.
  • a cycle of the engine begins in Figure 1 where the piston 10 is at top dead centre in a cylinder 11 and a volume of fuel-air mixture 12 is fully compressed.
  • An exhaust port 13 and an inlet port 14 are provided in the wall of the cylinder 11.
  • a rotary valve 15 is mounted adjacent the inlet port 14 to control a supply pressurised fuel-air mixture entering an intake 16.
  • a spark plug (not shown) will be initiated at about 10° before top-dead-centre in conventional fashion to start the fuel burning to begin a power stroke of the engine .
  • the piston 10 is at bottom-dead-centre and the exhaust port 13 and the valve 15 are fully open.
  • the piston 10 begins to rise again to commence a compression stroke, in Figure 5, closing off the exhaust port 13, while the valve 15 remains open.
  • fuel-air mixture in the cylinder above the top of the piston is pressurised for providing a ' super-charged' operation of the engine.
  • the rotary valve is formed in a rod rotatably supported in a cylinder head block and mechanically coupled to a flywheel or crank shaft of the engine.
  • the valve is preferably arranged to open, gradually, or in effect "in stages” , so that by its shape directs the fuel-air mixture into the top of the cylinder 11 when the valve 15 initially opens (see Figure 3) .
  • This upward directing of incoming fuel-air mixture purges burnt gases out of the top of the cylinder and ensures that the top of the cylinder is well- supplied with new fuel-air mixture.
  • directing the initial injection of new fuel-air mixture provides a more efficient way of filling the cylinder, because new fuel-air mixture is not then blown straight across the cylinder 11 and out of the open exhaust port 13.
  • valve 15 is not exposed to any detrimental degree to (hot) burnt gases, i.e. exhaust gases.
  • the incoming fuel-air mixture provides significant cooling of the valve 15.
  • the valve 15 may be made of generally "ordinary" materials and/or have a significantly long serviceable life.
  • the engine is generally the same as described above, except that a piston 16 is shown as 'freely floating' in a cylinder 17.
  • the piston 16 comprises a solid body of graphite material that is free to move up and down in the cylinder 17.
  • An eccentric cam 18 mounted on a crank shaft 19 bears against a lower surface of the piston. As the crank shaft rotates, the cam 18 urges the piston 16 upwards during each compression stroke and during each power stroke the cam is pressed down by the piston to cause the crank shaft 19 to rotate, or in other words, to transfer power generated by the piston cause the crank shaft to rotate.
  • Belts are shown to mechanically connect the crank shaft to a supercharger 20 and a starter motor 21, and a valve operating rod 22.
  • the rod 22 is part of, or is used to drive, a rotary inlet valve, such as the valve 15 shown in Figures 1 to 6.
  • a spark plug 23 is mounted in the top of the cylinder 17.
  • a flywheel (not shown) is normally mounted at one end of the crank shaft 19.
  • the engine includes a normally-closed "starting valve" 24 connected to an outlet passage of the supercharger 20.
  • starting valve normally-closed
  • the piston 16 will move up and down and its lower surface will remain in contact with the eccentric cam 18.
  • the piston 16 may be positioned adjacent the top of the cylinder 17 and out-of-contact with the eccentric cam, while blocking off the inlet port .
  • fuel -air mixture cannot be supplied into the cylinder and the engine will not start.
  • the provision of the starting valve 24 allows pressurised fuel -air mixture to enter the top of the cylinder to force the piston down, as may be required.
  • the starting valve normally takes no further part in the operation of the engine. Clearly, if the engine has a 'normal' connecting rod extending between the piston 16 and the crank shaft 19, the starting valve is not required.
  • the further engine which has three cylinders. Each cylinder has two inlet ports and one outlet port.
  • Rotary valves are provided by arranging circular rods 26 rotatably mounted in a cylinder block 27 in a zig-zag array. The rods are mechanically connected together by gears at their remote ends .
  • One of the rods is driven from a crank shank of the engine by a belt, such as a belt shown in Figure 7.
  • the rods 26 are partially cut away opposite each of the respective inlet ports so as to be shaped and comprise the rotary valves 15 shown in Figures .-1 to 6.
  • the purging of exhaust gases is improved in the further engine shown in Figure 8 because the inlet gases are not only initially directed upwards in the manner described in Figures 1 to 6, but also generally into the cylinder opposite a respective outlet port.
  • the outlet port is positioned in a vertical plane that bisects the cylinder and the inlet ports are arranged at either side of the vertical plane in a wall of the cylinder opposite the outlet port. It is however believed that this latter feature alone could provide an improved purging of burnt gases and also more readily and quickly supply new fuel mixture into the cylinders for each engine cycle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un moteur à deux temps qui comporte un piston (10) effectuant un mouvement de va-et-vient dans un cylindre pour fermer cycliquement un orifice d'échappement (13) et un orifice d'admission (14). Une vanne rotative (15) commande l'écoulement d'un mélange air-carburant dans l'orifice d'admission. Pendant chaque temps de compression, l'orifice d'échappement est fermé par le piston avant que l'orifice d'admission soit fermé par ledit piston.
PCT/CN2001/001066 2001-06-29 2001-06-29 Moteur a deux temps WO2003002858A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2001/001066 WO2003002858A1 (fr) 2001-06-29 2001-06-29 Moteur a deux temps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2001/001066 WO2003002858A1 (fr) 2001-06-29 2001-06-29 Moteur a deux temps

Publications (1)

Publication Number Publication Date
WO2003002858A1 true WO2003002858A1 (fr) 2003-01-09

Family

ID=4574823

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2001/001066 WO2003002858A1 (fr) 2001-06-29 2001-06-29 Moteur a deux temps

Country Status (1)

Country Link
WO (1) WO2003002858A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019078772A1 (fr) * 2017-10-16 2019-04-25 Hedman Ericsson Patent Ab Procédé mis en œuvre dans un moteur à deux temps, et moteur à deux temps
RU2775328C2 (ru) * 2017-10-16 2022-06-29 Хедман Эрикссон Патент Аб Способ в двухтактном двигателе и двухтактный двигатель

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342893A1 (fr) * 1988-05-17 1989-11-23 Group Lotus Plc Moteur à combustion interne
CN1150216A (zh) * 1995-09-19 1997-05-21 本田技研工业株式会社 二冲程内燃机
CN1177054A (zh) * 1996-09-19 1998-03-25 本田技研工业株式会社 二冲程内燃机

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342893A1 (fr) * 1988-05-17 1989-11-23 Group Lotus Plc Moteur à combustion interne
CN1150216A (zh) * 1995-09-19 1997-05-21 本田技研工业株式会社 二冲程内燃机
CN1177054A (zh) * 1996-09-19 1998-03-25 本田技研工业株式会社 二冲程内燃机

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019078772A1 (fr) * 2017-10-16 2019-04-25 Hedman Ericsson Patent Ab Procédé mis en œuvre dans un moteur à deux temps, et moteur à deux temps
CN111212966A (zh) * 2017-10-16 2020-05-29 海德曼爱立信专利公司 二冲程发动机中的方法和二冲程发动机
KR20200065053A (ko) * 2017-10-16 2020-06-08 헤드만 에릭슨 페이턴트 에이비 2-행정 엔진에서의 방법 및 2-행정 엔진
US20200325834A1 (en) * 2017-10-16 2020-10-15 Hedman Ericsson Patent Ab Method in a two-stroke engine and two-stroke engine
JP2020537073A (ja) * 2017-10-16 2020-12-17 ヘドマン エリクソン パテント アーベーＨｅｄｍａｎ Ｅｒｉｃｓｓｏｎ Ｐａｔｅｎｔ Ａｂ ２ストロークエンジン
RU2775328C2 (ru) * 2017-10-16 2022-06-29 Хедман Эрикссон Патент Аб Способ в двухтактном двигателе и двухтактный двигатель
JP7282756B2 (ja) 2017-10-16 2023-05-29 ヘドマン エリクソン パテント アーベー ２ストロークエンジン
US11828238B2 (en) 2017-10-16 2023-11-28 Hedman Ericsson Patent Ab Method in a two-stroke engine and two-stroke engine
KR102638479B1 (ko) * 2017-10-16 2024-02-19 헤드만 에릭슨 페이턴트 에이비 2-행정 엔진에서의 방법 및 2-행정 엔진

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