WO2004018853A1 - Ameliorations apportees a un moteur de combustion interne a quatre temps - Google Patents

Ameliorations apportees a un moteur de combustion interne a quatre temps Download PDF

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Publication number
WO2004018853A1
WO2004018853A1 PCT/NO2002/000295 NO0200295W WO2004018853A1 WO 2004018853 A1 WO2004018853 A1 WO 2004018853A1 NO 0200295 W NO0200295 W NO 0200295W WO 2004018853 A1 WO2004018853 A1 WO 2004018853A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
intake
valve
cylinder
exhaust
Prior art date
Application number
PCT/NO2002/000295
Other languages
English (en)
Inventor
Ragnar Aanmoen
Original Assignee
Ragnar Aanmoen
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
Priority to NO20014040A priority Critical patent/NO314553B1/no
Application filed by Ragnar Aanmoen filed Critical Ragnar Aanmoen
Priority to AU2002321946A priority patent/AU2002321946A1/en
Priority to PCT/NO2002/000295 priority patent/WO2004018853A1/fr
Publication of WO2004018853A1 publication Critical patent/WO2004018853A1/fr

Links

Classifications

    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/02—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped 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
    • 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
    • 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
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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
    • F02B2720/00—Engines with liquid fuel
    • F02B2720/22—Four stroke engines
    • F02B2720/226—Four stroke engines with measures for improving combustion

Definitions

  • the present invention relates to a four-stroke internal combustion engine arrangement as disclosed in the preamble of patent claim 1.
  • An internal combustion engine of the said type is a thermodynamic engine in which a fuel mixture is burned in a cylinder. The heat energy is converted into mechanical work by the pressure of the combustion gas acting on a movable piston in the cylinder.
  • the piston has a rectilinear alternating motion which is transformed into a rotary motion by means of a crank mechanism.
  • the shaft in the crank mechanism is also the energy outlet of the engine.
  • the processes inside the cylinder take place in series, which comprise air and fuel supply, compression, combustion, expansion and expulsion of combustion gas.
  • Each piston stroke in the series represents one stroke of the four-stroke cycle.
  • Internal combustion engines are categorised according to stroke type, namely two-stroke and four-stroke engines.
  • the invention relates to four-stroke engines.
  • valve-controlled overhead or side intake and exhaust ports or openings are provided in the cylinder for the intake and exhaust of a fuel mixture and combustion gas, respectively.
  • valve gears comprise camshafts which act directly or indirectly (levers) on the valves.
  • the camshaft(s) is/are driven from the engine shaft.
  • the space in a cylinder also sets limits for the size of the valve ports, where, for example, in the case of overhead valves there is only a limited area (the cylinder surface) available.
  • Side valves provide better space, but common to all valve arrangements is that the camshaft, valve springs, valve gears etc. require space and are subject to inner friction.
  • the valve springs in particular have a speed limiting effect. Heat generation and vibrations are also a problem
  • the object of the present invention is to provide a four-stroke engine which is lighter (lower weight), can be made smaller (more compact), and can be manufactured more cheaply than the four-stroke engines known to date. Therefore, according to the invention, an arrangement as defined in patent claim 1 is proposed. Additional features of the invention are disclosed in the dependent patent claims.
  • piston-controlled ports are known in the case of two-stroke engines, and it is also known to use check valves, but then in the form of reed valves, in two-stroke engines, in the intake/flushing system.
  • check valves are incorporated in the flushing system which is typical for two-stroke engines, where the crankcase is used as a mixing chamber for air and fuel before it passes into the cylinder chamber above the piston, the check valve then preventing flow back to the carburettor.
  • Figure 2 shows a section of the upper engine area, on a larger scale.
  • Figure 1 shows a four-stroke internal combustion engine comprising a cylinder 1, a crankcase 2 and a cylinder head 3.
  • a reciprocating piston 4 which is connected via a connecting rod 5 to the crankshaft 6 supported in the crankcase 2, indicated by means of a circle on the drawing.
  • An intake for fuel mixture is indicated by means of the reference numeral 7, and an exhaust valve is indicated by means of the reference numeral 8.
  • An opening 9 in the cylinder head 3 for the positioning of a spark plug/ignition element (not shown) is merely indicated.
  • the illustrated internal combustion engine works in a known way for a four-stroke engine.
  • the crank mechanism draws the piston from its top position to its bottom position. Air and fuel are then drawn in through the intake.
  • the compression stroke the crank mechanism presses the piston from its bottom position to its top position.
  • the intake valve closes and the fuel blend is compressed.
  • the working stroke the ignited fuel mixture expands, pushing the piston from its top position to its bottom position.
  • the exhaust valve opens.
  • the fourth stroke the exhaust stroke, the crank mechanism moves the piston from its bottom position to its top position.
  • the exhaust valve is open.
  • the combustion gas is then expelled from the cylinder. There then follows a new intake stroke etc.
  • the engine has a new and advantageous intake system 7.
  • An opening or port 10 is made in the cylinder wall of the cylinder 1, see in particular Figure 2.
  • This port 10 is connected through a duct 11, merely indicated in the figure, to a carburettor (not shown).
  • a check valve 12 is provided in the duct/port 10/11 in the form of two flat tongues 13 and 14 which cooperate with a valve seat 15.
  • the exhaust valve 9 is in the form of a rotary valve, with a rotary body 16 that has a diametrical duct 17, which can be brought into alignment with an exhaust port 18 in the cylinder 1 and an exhaust gas pipe 19.
  • the rotary body 16 rotates with the crankshaft with the aid of a non-illustrated transmission belt, at a transmission ratio of 1 :4.
  • the rotary valve, i.e., the rotary body 16 thus runs at half the speed of an ordinary camshaft.
  • One of the advantages of a rotary body of this kind is the reduced speed, with fewer tensions in and a longer life for the transmission belt.
  • the use of such rotary valves in motors is known and the rotary valve per se does not represent any novelty.
  • the relatively late opening of the intake 7 does not represent a disadvantage. It is also easily compensated for because the positioning of the intake port 10 in the cylinder wall now allows the possibility of a larger port opening (cross-sectional area), with increased rate of admission. It is also possible to have more than one port 10 in the cylinder wall.
  • the check valve 12 works quickly and independently and does not require any mechanical or hydraulic valve control.
  • the notable advantage of the invention is the simplified intake system, without mechanical controls, as the intake valve is piston-controlled and automatic.
  • the invention also permits other simplifications, such as in the exhaust valve, which can advantageously be made as a simple rotary valve, although ordinary or conventional exhaust valves can be used.
  • piston-controlled intake opening may also be used without a diaphragm or check valve, but in that case there is a compressor which ensures that there is pressure above atmospheric in the intake duct.
  • the check valve must be positioned in the intake duct as close to the piston as possible, to avoid power loss.
  • the new intake system has no effect on the electronic control units used in a modern engine, such as lambda probe catalytic converters.
  • the invention can also be implemented as an additional feature in a conventional overhead valve four-stroke engine in order to achieve better admission and better engine output.
  • metal materials suitable for such valve environments may be used as the material in the check valve, i.e., the flat tongues 13, 14.
  • One possible material is a Kevlar-based material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un moteur à combustion interne à quatre temps comprenant un piston (4) alternatif de manière linéaire dans un cylindre présentant une paroi de cylindre présentant des orifices (7, 8) d'entrée et d'échappement commandés par des soupapes dans le cylindre (1) destinés à mélanger le carburant et un gaz de combustion respectivement. Ledit orifice d'entrée (10) est disposé dans la paroi du cylindre, de sorte qu'il est fermé et ouvert en alternance par le piston (4) alternatif. Ledit orifice d'entrée (10) est pourvu d'une soupape plate (12) à languettes qui obture l'entrée lorsque la pression est supérieure à la pression atmosphérique et l'ouvre, lorsqu'il y a une pression négative dans le cylindre (1). Ledit orifice d'échappement (8) est pourvu d'une soupape d'échappement se présentant sous la forme d'une soupape rotative (8, 16), de manière connue en soi, située en dessous d'une zone annulaire du piston (20) sur le piston (4), lorsque le piston (4) est au centre, de sorte qu'il se situe en dessous de la zone annulaire du piston (20) dans la phase d'allumage du mélange de carburant.
PCT/NO2002/000295 2001-08-20 2002-08-23 Ameliorations apportees a un moteur de combustion interne a quatre temps WO2004018853A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NO20014040A NO314553B1 (no) 2001-08-20 2001-08-20 Anordning ved 4-takt forbrenningsmotor
AU2002321946A AU2002321946A1 (en) 2002-08-23 2002-08-23 Improvement in a 4-stroke internal combustion engine
PCT/NO2002/000295 WO2004018853A1 (fr) 2001-08-20 2002-08-23 Ameliorations apportees a un moteur de combustion interne a quatre temps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20014040A NO314553B1 (no) 2001-08-20 2001-08-20 Anordning ved 4-takt forbrenningsmotor
PCT/NO2002/000295 WO2004018853A1 (fr) 2001-08-20 2002-08-23 Ameliorations apportees a un moteur de combustion interne a quatre temps

Publications (1)

Publication Number Publication Date
WO2004018853A1 true WO2004018853A1 (fr) 2004-03-04

Family

ID=32684356

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2002/000295 WO2004018853A1 (fr) 2001-08-20 2002-08-23 Ameliorations apportees a un moteur de combustion interne a quatre temps

Country Status (2)

Country Link
NO (1) NO314553B1 (fr)
WO (1) WO2004018853A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1555402A2 (fr) * 2004-01-19 2005-07-20 Euromotor S.P.A. Un moteur à combustion interne à deux temps, notamment pour outils portatifs comme scies entraínées par moteur, débroussailleuses, etc...

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600085519A1 (it) * 2016-08-16 2018-02-16 Daniele Orzi Motore a combustione interna, sovralimentato, con distribuzione a valvole rotative

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864984A (en) * 1986-09-02 1989-09-12 Blish Nelson A Rotary valve internal combustion engine
EP0877153A2 (fr) * 1997-05-05 1998-11-11 Devik International Inc. Moteur à combustion interne avec combustion améliorée

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864984A (en) * 1986-09-02 1989-09-12 Blish Nelson A Rotary valve internal combustion engine
EP0877153A2 (fr) * 1997-05-05 1998-11-11 Devik International Inc. Moteur à combustion interne avec combustion améliorée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1555402A2 (fr) * 2004-01-19 2005-07-20 Euromotor S.P.A. Un moteur à combustion interne à deux temps, notamment pour outils portatifs comme scies entraínées par moteur, débroussailleuses, etc...
EP1555402A3 (fr) * 2004-01-19 2009-07-22 Euromotor S.P.A. Un moteur à combustion interne à deux temps, notamment pour outils portatifs comme scies entraînées par moteur, débroussailleuses, etc...

Also Published As

Publication number Publication date
NO20014040L (no) 2003-02-21
NO20014040D0 (no) 2001-08-20
NO314553B1 (no) 2003-04-07

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