EP1555402A2 - Two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc... - Google Patents
Two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc... Download PDFInfo
- Publication number
- EP1555402A2 EP1555402A2 EP05000886A EP05000886A EP1555402A2 EP 1555402 A2 EP1555402 A2 EP 1555402A2 EP 05000886 A EP05000886 A EP 05000886A EP 05000886 A EP05000886 A EP 05000886A EP 1555402 A2 EP1555402 A2 EP 1555402A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- valve
- internal combustion
- combustion engine
- engine
- 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- Withdrawn
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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
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
Definitions
- This invention relates to a two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc.
- Two-stroke engines comprising a bed on which a cylindrical seat for the reciprocating piston is applied, to which the inlet port for the mixture and the outlet port for the spent gas are connected.
- An object of the invention is to eliminate this drawback by providing a two-stroke internal combustion engine having high efficiency and low fuel consumption while at the same time not causing atmospheric pollution.
- the internal combustion engine comprises substantially a bed 2 provided with a cylindrical seat 6 presenting cooling fins 4 and within which there slides a piston 8 provided with a connecting rod 10 pivoted by a pin 12 to a crank 14.
- the conduit 20 feeding the mixture from the carburettor and the electrodes 22 of the spark plug 26 lead into the cylindrical seat, which also presents a further aperture 28 connecting the cylindrical chamber to the conduit 30 for discharging the exhaust gas to a silencer (not shown in the drawings) via an interposed valve 32.
- the valve 32 consists of a cylindrical body comprising a channel 34 of substantially rectangular cross-section with its axis perpendicular to the axis of the cylindrical body and rigid with a shaft 36, mounted on bearings 38, which engages by means of a taper fit a ring gear 40 connected by a belt 42 to a further ring gear 44 keyed onto the rotation shaft of the crank 14.
- the ring gear 40 has twice the number of teeth as the ring gear 44, so that one complete rotation of the crank 14 corresponds to one half of a rotation of the valve 32.
- the two ring gears 40 and 44 are mutually coordinated such that when the piston lies in its bottom dead centre position, the channel 34 of the cylindrical body almost completely faces the discharge aperture 30.
- the internal combustion engine operates in the following manner, with reference to Figures 1-5.
- the shaft 36 engages a gearwheel 50 engaging an intermediate gearwheel 52 which itself engages a gearwheel 54 keyed onto the crankshaft 16.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transmission Devices (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
- This invention relates to a two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc.
- Two-stroke engines are known comprising a bed on which a cylindrical seat for the reciprocating piston is applied, to which the inlet port for the mixture and the outlet port for the spent gas are connected.
- However, these known engines present the drawback that during piston descent, the mixture passing through the transfer ports which connect together the two chambers separated by the piston can mix with the spent gas, with the result that on the one hand there is a decrease in efficiency and on the other hand atmospheric pollution due to the escape of unburnt mixture from the discharge port.
- An object of the invention is to eliminate this drawback by providing a two-stroke internal combustion engine having high efficiency and low fuel consumption while at the same time not causing atmospheric pollution.
- This and further objects which will be apparent from the ensuing description are attained according to the invention by a two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc. as described in claim 1.
- The invention is further clarified hereinafter with reference to the accompanying drawings, in which:
- Figure 1
- is a longitudinal section through the engine of the invention with the piston rising towards its top dead centre,
- Figure 2
- shows it with the piston at its top dead centre,
- Figure 3
- shows it with the piston descending,
- Figure 4
- shows it with the piston at its bottom dead centre,
- Figure 5
- shows it with the piston again rising,
- Figure 6
- shows it in side view,
- Figure 7
- shows it in front view,
- Figure 8
- shows a variant thereof.
- As can be seen from the figures, the internal combustion engine according to the invention comprises substantially a
bed 2 provided with acylindrical seat 6 presentingcooling fins 4 and within which there slides apiston 8 provided with a connectingrod 10 pivoted by apin 12 to acrank 14. - The
conduit 20 feeding the mixture from the carburettor and theelectrodes 22 of thespark plug 26 lead into the cylindrical seat, which also presents afurther aperture 28 connecting the cylindrical chamber to theconduit 30 for discharging the exhaust gas to a silencer (not shown in the drawings) via an interposedvalve 32. - The
valve 32 consists of a cylindrical body comprising achannel 34 of substantially rectangular cross-section with its axis perpendicular to the axis of the cylindrical body and rigid with ashaft 36, mounted onbearings 38, which engages by means of a taper fit aring gear 40 connected by abelt 42 to afurther ring gear 44 keyed onto the rotation shaft of thecrank 14. - Specifically, the
ring gear 40 has twice the number of teeth as thering gear 44, so that one complete rotation of thecrank 14 corresponds to one half of a rotation of thevalve 32. - Moreover the two
ring gears channel 34 of the cylindrical body almost completely faces thedischarge aperture 30. - The internal combustion engine operates in the following manner, with reference to Figures 1-5.
- Figure 1: piston rising towards its top dead centre.
In this configuration the
valve 32 closes the passage between theaperture 28 and theconduit 30, the rising of the piston enabling the mixture to enter thechamber 44 through theconduit 20. During this phase thepiston 8 closes the aperture of thetransfer ports 46 which connect thechamber 44 positioned below the aperture to thechamber 48 facing thespark plug 26. - Figure 2: piston at its top dead centre.
The
valve 32 again closes the passage, theconduit 20 is completely open and the mixture completely fills thechamber 44. The spark between theelectrodes 22 of thespark plug 26 is generated to ignite the mixture contained in thechamber 48. - Figure 3: piston descending towards its bottom dead centre.
The
piston 8 closes theconduit 20 and thevalve 32 becomes positioned such that theconduit 34 faces theaperture 28, to hence enable the spent gas to disperse towards theconduit 30. - Figure 4: piston at its bottom dead centre.
The
piston 8 closes theconduit 20 and thevalve 32 begins to close the passage between theaperture 28 and conduit 30. Thetransfer ports 46 are completely open so that the mixture contained in thechamber 44 can pass, urged by thecrank 14, into thechamber 48. - Figure 5: piston begins to rise towards its top dead centre.
The
valve 32 closes the passage between theaperture 28 and theconduit 30, thepiston 8 again closes theconduit 20 and closes thetransfer ports 46, and the mixture is compressed in thechamber 48. -
- From the aforegoing it is apparent that the internal combustion engine according to the invention presents:
- a high efficiency due to the advance closure of the discharge, enabling the piston to more greatly compress the mixture, to hence improve combustion,
- reduced fuel consumption as the mixture passing through the
transfer ports 46 is prevented from escaping from the discharge conduit entrained by the spent gas, seeing that thevalve 32 closes thedischarge conduit 30 before thepiston 8 would have closed it, so considerably reducing environmental pollution. - In the embodiment shown in Figure 8, the
shaft 36 engages agearwheel 50 engaging anintermediate gearwheel 52 which itself engages agearwheel 54 keyed onto thecrankshaft 16.
Claims (5)
- A two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc., comprising a bed in which for the reciprocating piston at least one chamber is provided to which the mixture inlet and port and the spent gas outlet port are connected, characterised in that the spent gas outlet port is provided with a valve, the opening and closure of which are controlled by the rotation of the piston crankshaft.
- An engine as claimed in claim 1, characterised in that the valve consists of a rotatable cylindrical body provided with an aperture (34) which presents its maximum opening to the cylindrical chamber when the piston is about to attain its bottom dead centre.
- An engine as claimed in claim 2, characterised in that the valve (32) is mounted on a shaft (36) provided with a ring gear (40) connected via a belt (42) to a further ring gear (44) rotationally rigid with the rotation shaft (16) of the crank (14).
- An engine as claimed in claim 3, characterised in that the ring gear (42) has twice the number of teeth as the ring gear (44).
- An engine as claimed in claim 2, characterised in that the valve is rigid with a shaft (36) provided with a gearwheel (50) engagable via an intermediate gearwheel (52) with a gearwheel (54) keyed onto the shaft (16) of the crank (14).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVE20040002U | 2004-01-19 | ||
ITVE20040002 ITVE20040002U1 (en) | 2004-01-19 | 2004-01-19 | TWO STROKE INTERNAL COMBUSTION ENGINE, IN PARTICULAR FOR PORTABLE EQUIPMENT SUCH AS CHAINSAWS, BRUSHCUTTERS, ETC. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1555402A2 true EP1555402A2 (en) | 2005-07-20 |
EP1555402A3 EP1555402A3 (en) | 2009-07-22 |
Family
ID=34611272
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05000886A Withdrawn EP1555402A3 (en) | 2004-01-19 | 2005-01-18 | Two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc... |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1555402A3 (en) |
IT (1) | ITVE20040002U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1040344C2 (en) * | 2013-08-21 | 2015-02-24 | Vhm Van Haandel Motorparts B V | TWO-STROKE ENGINE BLOCK WITH INNOVATIVE CARTER, WITH TECHNICAL SOLUTIONS FOUND. THE CARTER IS CONSTRUCTED SO THAT THE CARBURETOR CAN BE HORIZONTALLY POSITIONED. THE ROTATION DIRECTION OF THE CRANKSHAFT IS REVERSED T.O.V. AN EXISTING ENGINE BLOCK. THE CRANKSHAFT ROTES THE SAME DIRECTION AS THE FLOW DIRECTION OF THE AIR-FUEL MIXTURE. THE AIR-FUEL MIXTURE FLOWS FROM THE CARBURETOR THROUGH A SEPARATE FLOW CHANNEL IN THE CARTER THROUGH THE CRANKSHAFT. AN INTERMEDIATE WHEEL IS NECESSARY AT THE INNOVATIVE CARTER. |
CN108757962A (en) * | 2018-06-13 | 2018-11-06 | 宁波市鄞州拓创服饰有限公司 | A kind of flow regulating valve |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4864984A (en) * | 1986-09-02 | 1989-09-12 | Blish Nelson A | Rotary valve internal combustion engine |
DE9420091U1 (en) * | 1994-12-16 | 1995-02-16 | Wieneke, Svein, 41063 Mönchengladbach | Opto-electronic control of the exhaust duct cross-section adjustment unit for two-stroke internal combustion engines |
DE4438513A1 (en) * | 1994-10-31 | 1996-05-02 | Siegbert A Woll | Automatic exhaust control for two-stroke engine |
US20030230258A1 (en) * | 2002-06-12 | 2003-12-18 | Niemiz Hector Alvaro Javier | Two-stroke engines exhaust and scavenge control |
WO2004018853A1 (en) * | 2001-08-20 | 2004-03-04 | Ragnar Aanmoen | Improvement in a 4-stroke internal combustion engine |
-
2004
- 2004-01-19 IT ITVE20040002 patent/ITVE20040002U1/en unknown
-
2005
- 2005-01-18 EP EP05000886A patent/EP1555402A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4864984A (en) * | 1986-09-02 | 1989-09-12 | Blish Nelson A | Rotary valve internal combustion engine |
DE4438513A1 (en) * | 1994-10-31 | 1996-05-02 | Siegbert A Woll | Automatic exhaust control for two-stroke engine |
DE9420091U1 (en) * | 1994-12-16 | 1995-02-16 | Wieneke, Svein, 41063 Mönchengladbach | Opto-electronic control of the exhaust duct cross-section adjustment unit for two-stroke internal combustion engines |
WO2004018853A1 (en) * | 2001-08-20 | 2004-03-04 | Ragnar Aanmoen | Improvement in a 4-stroke internal combustion engine |
US20030230258A1 (en) * | 2002-06-12 | 2003-12-18 | Niemiz Hector Alvaro Javier | Two-stroke engines exhaust and scavenge control |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1040344C2 (en) * | 2013-08-21 | 2015-02-24 | Vhm Van Haandel Motorparts B V | TWO-STROKE ENGINE BLOCK WITH INNOVATIVE CARTER, WITH TECHNICAL SOLUTIONS FOUND. THE CARTER IS CONSTRUCTED SO THAT THE CARBURETOR CAN BE HORIZONTALLY POSITIONED. THE ROTATION DIRECTION OF THE CRANKSHAFT IS REVERSED T.O.V. AN EXISTING ENGINE BLOCK. THE CRANKSHAFT ROTES THE SAME DIRECTION AS THE FLOW DIRECTION OF THE AIR-FUEL MIXTURE. THE AIR-FUEL MIXTURE FLOWS FROM THE CARBURETOR THROUGH A SEPARATE FLOW CHANNEL IN THE CARTER THROUGH THE CRANKSHAFT. AN INTERMEDIATE WHEEL IS NECESSARY AT THE INNOVATIVE CARTER. |
CN108757962A (en) * | 2018-06-13 | 2018-11-06 | 宁波市鄞州拓创服饰有限公司 | A kind of flow regulating valve |
Also Published As
Publication number | Publication date |
---|---|
EP1555402A3 (en) | 2009-07-22 |
ITVE20040002U1 (en) | 2004-04-19 |
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