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 PDFInfo
- 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
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)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
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)
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)
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)
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 |
-
2001
- 2001-08-20 NO NO20014040A patent/NO314553B1/no not_active IP Right Cessation
-
2002
- 2002-08-23 WO PCT/NO2002/000295 patent/WO2004018853A1/fr not_active Application Discontinuation
Patent Citations (2)
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)
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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