EP2115276B1 - Improved two-stroke engine - Google Patents
Improved two-stroke engine Download PDFInfo
- Publication number
- EP2115276B1 EP2115276B1 EP08709311.8A EP08709311A EP2115276B1 EP 2115276 B1 EP2115276 B1 EP 2115276B1 EP 08709311 A EP08709311 A EP 08709311A EP 2115276 B1 EP2115276 B1 EP 2115276B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cylinder
- inlet valve
- piston rod
- inlet
- 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.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000002000 scavenging effect Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
-
- 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
- F01L11/00—Valve arrangements in working piston or piston-rod
- F01L11/02—Valve arrangements in working piston or piston-rod in piston
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/36—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle
- F01L1/38—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle for engines with other than four-stroke cycle, e.g. with two-stroke cycle
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
-
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
- F01L9/16—Pneumatic means
Definitions
- the invention relates to a two-stroke crosshead engine with at least one cylinder and a piston reciprocating therein and provided with a piston rod for transmission of power, said cylinder being provided with inlet means for supplying scavenge air into the cylinder, with means for providing for ignition and combustion during the combustion stroke, and with exhaust valve means in accordance with the preamble of claim 1.
- the document JP61065013 A shows an arrangement described above.
- the piston is additionally provided with a scavenging displacer which, after the scavenging hole is opened is moved upward so that the residual gas in the cylinder is reliably discharged at the upper section, while the scavenging air is sucked at the lower section.
- An aim of the invention is to provide a new and improved two-stroke crosshead engine, which solves i.a. the above mentioned problems of the prior art
- the inlet means include channel means for leading scavenge air through the piston into the cylinder and inlet valve means arranged on the piston for controlling the supply of scavenge air into the cylinder through the channel means.
- the inlet valve means include a valve surface on the piston in association with the channel means and an inlet valve or the like cooperating with the valve surface and movably supported on the piston rod.
- the piston rod is provided with control valve means operatively connected with the inlet valve means for the control thereof.
- the control valve means are either hydraulically or pneumatically operated, and the piston rod is provided with a chamber with an auxiliary piston element movably arranged therein and fixed to the inlet valve.
- the chamber is arranged to communicate through the piston rod with a hydraulic fluid source for controlling the movements of the auxiliary piston element and, thus, the operation of the inlet valve means.
- a hydraulic control and a control logic are provided for timing of operation of the control valve such that the inlet valve is arranged to open when the piston is moving up.
- This novel solution has a number of advantages. Since there are no longer inlet ports located at a fixed position in the cylinder liner effecting adversely on the film of lubrication oil, the scuffing and thus the wear of the piston with the piston rings and the cylinder liner can be reduced, which is prone to increase the life-time of the said components.
- the piston and the inlet valve means can be cooled by the scavenge air. This is particularly of advantage since the more air is needed for combustion the bigger is the cooling flow through the piston, since the amount of available cooling air follows the output of the engine. As a consequence the conventional oil cooling can be reduced or possibly even dispensed with regarding certain components. Further, the new solution makes it possible to affect the timing of the inlet valve means. By changing the exact opening and closing time of the inlet valve means the scavenge time can correspondingly be changed depending on the load situation to give optimum performance.
- the inlet valve means include a valve surface on the piston in association with the channel means and an inlet valve or the like, preferably in the form of a disc valve, cooperating with the valve surface and movably supported on the piston rod.
- Timing of the inlet valve means can with advantage be arranged by providing the piston rod with control valve means operatively connected with the inlet valve means for the control thereof.
- the control valve means are with advantage either hydraulically or pneumatically operated.
- the piston rod is provided with a chamber with an auxiliary piston element movably arranged therein and fixed to the disc valve.
- This chamber can be arranged to communicate through the piston rod with a hydraulic fluid source for controlling the movements of the auxiliary piston element and, thus, the operation of the inlet valve means.
- control valve means are urged by spring means towards the closing position of the inlet valve means.
- the channel means may comprise a number of separate channels arranged to be continuously in connection with a scavenge air supply source.
- the invention may with advantage be applied independent on the actual way of operation of the two-stroke engine.
- the means for providing for ignition and combustion include injection valve means for feeding fuel into the cylinder.
- the engine is provided with a turbocharger for compressing the scavenge air to be fed into the cylinder.
- the means for providing for ignition and combustion include spark plug means.
- the fuel is arranged to be mixed with the scavenge air before feeding it into the cylinder as is well known in the art as such.
- reference numeral 1 indicates a part of an engine block including a cylinder 2 defined mainly by a cylinder liner 3.
- the cylinder 2 is provided with a piston 4 arranged to move in a reciprocating manner therein. Since the engine is a crosshead engine, the piston 4 is fixed to a piston rod 5, which is slidably supported to the cylinder block 1, or to some part fixed thereto, so that also the piston rod 5 moves reciprocatingly.
- the mutual fixing of the piston 4 and the piston rod 5 can be arranged in a way known as such e.g. by means of bolts 20 as is shown in figures 4 and 5 . Power transmission from the piston 4 and the piston rod 5 occurs via a connecting rod (not disclosed) in a manner as is generally known in the art.
- the engine block 1 is provided with a chamber 6 for feeding of scavenge air into the cylinder 2.
- the chamber 6 is for its part in connection with an inlet pipe or duct (not shown).
- the piston 4, and possibly the upper part of the piston rod 5 depending on their design and mutual fixing is provided with a number of channels 10 opening at the head part of the piston 4 toward the cylinder 2 and forming a common inlet opening arranged to form a valve surface 11.
- an inlet valve 12 is by means of its stem 12a slidably mounted within and guided by the piston rod 5.
- the upper end of the cylinder 2 includes an exhaust valve 9 arranged in a cylinder head 7 of the engine and controlling an exhaust duct 8.
- the cylinder head 7 is also provided with means 18 for providing for ignition and combustion.
- the means 18 may be injection means arranged to inject fuel for ignition of the scavenge air at the end phase of the compression stroke. In this case the question is about a diesel engine.
- the means 18 may be spark plug means igniting a mixture of scavenge air and fuel supplied into the cylinder 2 through the chamber 6.
- FIG 1 depicting intake and scavenge strokes
- the piston 4 is moving up and the inlet valve 12 is opened for allowing scavenge air into the cylinder 2.
- the exhaust gases are removed through the exhaust valve 9.
- the exhaust valve 9 as well as the inlet valve 12 are closed and compression stroke follows.
- the scavenge air is compressed and at the end phase of the compression stroke the gases in the cylinder 2 are ignited, whichever is the way of operation of the engine.
- Power stroke follows. At the end of the power stroke the piston 4 still moving downwards the exhaust valve 9 is opened.
- the inlet valve 12 still being in its closed position the pressure is relieved and the exhaust gases rush out of the cylinder into the exhaust duct 8 as is depicted in figure 3 .
- the exhaust valve 9 still being open the intake air presses the rest of the exhaust gases into the exhaust duct 8 until the exhaust valve 9 is again closed.
- Figures 4 and 5 illustrate one embodiment of the piston with the piston rod attached thereto by means of bolts 20.
- the channels 10 are arranged through both the piston rod 5 and the piston 4 and form a uniform chamber in connection with the valve surface 11 in the piston 4.
- a possible alternative solution for the one shown could be an arrangement involving integration of the piston rod to the piston to form one piece. This, however, would not allow utilising different materials for the piston and the piston rod.
- a control valve 13 operatively connected with the inlet valve 12 and comprising a chamber 14 arranged in the piston rod 5. Movably arranged in said chamber 14 there is an auxiliary piston element 15 fixed to the inlet valve 12 at the stem 12a thereof.
- the chamber 14 communicates through a duct 16 in the piston rod 5 with a hydraulic fluid source 19 (shown only schematically in figure 1 ) for controlling the movements of the auxiliary piston element 15 and, thus, the operation of the whole inlet valve 12.
- the control valve 13 is urged by a spring 17 towards the closing position of the inlet valve12.
- the force to open the inlet valve is assisted by the pressure of the scavenge air at the opening phase thereof and closing is assisted by inertia respectively. If required, instead of only one spring 17 a number of springs could be utilised for ensuring proper closing of the valve 13.
- the hydraulic control can be arranged in a way known as such in the field of hydraulics. Instead of hydraulics also pneumatics may with advantage be utilised for the purpose. Control logic is needed for proper operation and timing of the operation of the control valve 13 so as to adjust the supply of scavenge air into the cylinder to the loading situation of the engine in each case.
- each cylinder may be provided with more than one exhaust valve, the exact way of fixing of the piston to the piston rod may be selected as is convenient in each case etc.
- the operation of the control valve may be arranged in different ways, mechanical operation included.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The invention relates to a two-stroke crosshead engine with at least one cylinder and a piston reciprocating therein and provided with a piston rod for transmission of power, said cylinder being provided with inlet means for supplying scavenge air into the cylinder, with means for providing for ignition and combustion during the combustion stroke, and with exhaust valve means in accordance with the preamble of
claim 1. - In crosshead engines the piston reciprocating in a cylinder is not directly connected to a connecting rod but through a piston rod slidably supported to the engine. Hence, the piston rod together with the piston make only reciprocating movements in the cylinder. In two-stroke engines of this kind feeding of scavenge air is conventionally arranged through scavenge ports arranged in the lower part of the cylinder liner, whereby it is the piston itself that opens and closes these ports in a certain fixed phase of the combustion cycle. As a consequence the oil film lubricating the cylinder and the piston together with the piston rings is broken every time the piston moves past the port openings. This increases the wear of both the cylinder liner and the piston with the piston rings.
- The document
JP61065013 A - Document
WO 2005/028820 A1 discloses a two-stroke engine according to the preamble ofclaim 1. In highly loaded crosshead engines the piston has a high thermal load. The cooling is normally arranged with cooling oil supplied and drained through drillings in the piston rod and the connecting rod making the system rather complicated. - In addition in a two-stroke crosshead engine the timing of the Inlet scavenging is fixed to the geometry and position of the scavenging ports, and is, thus, independent on the load of engine in each case.
- An aim of the invention is to provide a new and improved two-stroke crosshead engine, which solves i.a. the above mentioned problems of the prior art
- The aims of the invention can be met substantially as is disclosed in
claim 1 and in the other claims. - The basic idea of the invention is to essentially change the way of feeding the scavenge air into the cylinder. According to the invention the inlet means include channel means for leading scavenge air through the piston into the cylinder and inlet valve means arranged on the piston for controlling the supply of scavenge air into the cylinder through the channel means.
- The inlet valve means include a valve surface on the piston in association with the channel means and an inlet valve or the like cooperating with the valve surface and movably supported on the piston rod. The piston rod is provided with control valve means operatively connected with the inlet valve means for the control thereof. The control valve means are either hydraulically or pneumatically operated, and the piston rod is provided with a chamber with an auxiliary piston element movably arranged therein and fixed to the inlet valve. The chamber is arranged to communicate through the piston rod with a hydraulic fluid source for controlling the movements of the auxiliary piston element and, thus, the operation of the inlet valve means. A hydraulic control and a control logic are provided for timing of operation of the control valve such that the inlet valve is arranged to open when the piston is moving up.
- This novel solution has a number of advantages. Since there are no longer inlet ports located at a fixed position in the cylinder liner effecting adversely on the film of lubrication oil, the scuffing and thus the wear of the piston with the piston rings and the cylinder liner can be reduced, which is prone to increase the life-time of the said components. The piston and the inlet valve means can be cooled by the scavenge air. This is particularly of advantage since the more air is needed for combustion the bigger is the cooling flow through the piston, since the amount of available cooling air follows the output of the engine. As a consequence the conventional oil cooling can be reduced or possibly even dispensed with regarding certain components. Further, the new solution makes it possible to affect the timing of the inlet valve means. By changing the exact opening and closing time of the inlet valve means the scavenge time can correspondingly be changed depending on the load situation to give optimum performance.
- The inlet valve means include a valve surface on the piston in association with the channel means and an inlet valve or the like, preferably in the form of a disc valve, cooperating with the valve surface and movably supported on the piston rod.
- Timing of the inlet valve means can with advantage be arranged by providing the piston rod with control valve means operatively connected with the inlet valve means for the control thereof. The control valve means are with advantage either hydraulically or pneumatically operated.
- In a practical embodiment the piston rod is provided with a chamber with an auxiliary piston element movably arranged therein and fixed to the disc valve. This chamber can be arranged to communicate through the piston rod with a hydraulic fluid source for controlling the movements of the auxiliary piston element and, thus, the operation of the inlet valve means.
- In order to secure proper function the control valve means are urged by spring means towards the closing position of the inlet valve means.
- The channel means may comprise a number of separate channels arranged to be continuously in connection with a scavenge air supply source.
- The invention may with advantage be applied independent on the actual way of operation of the two-stroke engine. Hence it may be an engine working on the diesel principle, whereby the means for providing for ignition and combustion include injection valve means for feeding fuel into the cylinder. In this case, in practice, the engine is provided with a turbocharger for compressing the scavenge air to be fed into the cylinder. Alternatively it may be a gasoline engine, whereby the means for providing for ignition and combustion include spark plug means. In this case the fuel is arranged to be mixed with the scavenge air before feeding it into the cylinder as is well known in the art as such.
- In the following the invention will be described, as a way of example only, with reference to the accompanying schematic drawings, in which
-
Figure 1 illustrates a cross-section of a cylinder of a two-stroke crosshead engine in accordance with an embodiment of the invention, at the intake and scavenge strokes both the inlet valve and the exhaust valve open, -
Figure 2 illustrates the cylinder offigure 1 , at the end phase of the compression stroke at the moment of ignition, -
Figure 3 illustrates the cylinder offigure 1 after the power stroke at the exhaust stroke the exhaust valve open, -
Figure 4 illustrates an embodiment of a piston according to the invention, and -
Figure 5 illustrates sections VA-VA and VB-VB offigure 4 . - In the
drawings reference numeral 1 indicates a part of an engine block including acylinder 2 defined mainly by acylinder liner 3. Thecylinder 2 is provided with apiston 4 arranged to move in a reciprocating manner therein. Since the engine is a crosshead engine, thepiston 4 is fixed to apiston rod 5, which is slidably supported to thecylinder block 1, or to some part fixed thereto, so that also thepiston rod 5 moves reciprocatingly. The mutual fixing of thepiston 4 and thepiston rod 5 can be arranged in a way known as such e.g. by means ofbolts 20 as is shown infigures 4 and5 . Power transmission from thepiston 4 and thepiston rod 5 occurs via a connecting rod (not disclosed) in a manner as is generally known in the art. - The
engine block 1 is provided with achamber 6 for feeding of scavenge air into thecylinder 2. Thechamber 6 is for its part in connection with an inlet pipe or duct (not shown). In order to feed scavenge air into thecylinder 2 thepiston 4, and possibly the upper part of thepiston rod 5 depending on their design and mutual fixing, is provided with a number ofchannels 10 opening at the head part of thepiston 4 toward thecylinder 2 and forming a common inlet opening arranged to form avalve surface 11. Arranged in cooperation with thisvalve surface 11 there is provided aninlet valve 12 with astem 12a. Theinlet valve 12 is by means of itsstem 12a slidably mounted within and guided by thepiston rod 5. - The upper end of the
cylinder 2 includes anexhaust valve 9 arranged in acylinder head 7 of the engine and controlling anexhaust duct 8. Thecylinder head 7 is also provided withmeans 18 for providing for ignition and combustion. Depending on the way of operation of the engine themeans 18 may be injection means arranged to inject fuel for ignition of the scavenge air at the end phase of the compression stroke. In this case the question is about a diesel engine. Alternatively themeans 18 may be spark plug means igniting a mixture of scavenge air and fuel supplied into thecylinder 2 through thechamber 6. - In
figure 1 , depicting intake and scavenge strokes, thepiston 4 is moving up and theinlet valve 12 is opened for allowing scavenge air into thecylinder 2. Simultaneously the exhaust gases are removed through theexhaust valve 9. Thereafter at a certain phase theexhaust valve 9 as well as theinlet valve 12 are closed and compression stroke follows. In accordance withfigure 2 , as a consequence, the scavenge air is compressed and at the end phase of the compression stroke the gases in thecylinder 2 are ignited, whichever is the way of operation of the engine. Power stroke follows. At the end of the power stroke thepiston 4 still moving downwards theexhaust valve 9 is opened. Theinlet valve 12 still being in its closed position the pressure is relieved and the exhaust gases rush out of the cylinder into theexhaust duct 8 as is depicted infigure 3 . After the lower dead centre the cycle starts again so that during the first phase of the intake and scavenge strokes, as depicted infigure 1 , theexhaust valve 9 still being open the intake air presses the rest of the exhaust gases into theexhaust duct 8 until theexhaust valve 9 is again closed. -
Figures 4 and5 illustrate one embodiment of the piston with the piston rod attached thereto by means ofbolts 20. As can be seen thechannels 10 are arranged through both thepiston rod 5 and thepiston 4 and form a uniform chamber in connection with thevalve surface 11 in thepiston 4. A possible alternative solution for the one shown could be an arrangement involving integration of the piston rod to the piston to form one piece. This, however, would not allow utilising different materials for the piston and the piston rod. - In order to be able to control timing of the
inlet valve 12 so as to better comply with the load situation of the engine in each case there is provided acontrol valve 13 operatively connected with theinlet valve 12 and comprising achamber 14 arranged in thepiston rod 5. Movably arranged in saidchamber 14 there is anauxiliary piston element 15 fixed to theinlet valve 12 at thestem 12a thereof. Thechamber 14 communicates through aduct 16 in thepiston rod 5 with a hydraulic fluid source 19 (shown only schematically infigure 1 ) for controlling the movements of theauxiliary piston element 15 and, thus, the operation of thewhole inlet valve 12. Thecontrol valve 13 is urged by aspring 17 towards the closing position of the inlet valve12. It should be noted that the force to open the inlet valve is assisted by the pressure of the scavenge air at the opening phase thereof and closing is assisted by inertia respectively. If required, instead of only one spring 17 a number of springs could be utilised for ensuring proper closing of thevalve 13. - The hydraulic control can be arranged in a way known as such in the field of hydraulics. Instead of hydraulics also pneumatics may with advantage be utilised for the purpose. Control logic is needed for proper operation and timing of the operation of the
control valve 13 so as to adjust the supply of scavenge air into the cylinder to the loading situation of the engine in each case. - It is clear that the invention is not limited to the examples mentioned above but can be implemented in many other different embodiments within the scope of the inventive idea defined in the attached claims. Thus the application of the invention is independent on the exact number of cylinders in the engine, each cylinder may be provided with more than one exhaust valve, the exact way of fixing of the piston to the piston rod may be selected as is convenient in each case etc. Also the operation of the control valve may be arranged in different ways, mechanical operation included.
Claims (5)
- A two-stroke crosshead engine with at least one cylinder (2) and a piston (4) reciprocating therein and provided with a piston rod (5) for transmission of power, said cylinder (2) being provided with inlet means for supplying scavenge air into the cylinder (2), with means (18) for providing for ignition and combustion during the combustion stroke, and with exhaust valve means (9), the inlet means including channel means (10) for leading scavenge air through the piston into the cylinder (2) and inlet valve means (11,12) arranged on the piston for controlling the supply of scavenge air into the cylinder (2) through the channel means (10), said inlet valve means (11,12) including a valve surface (11) on the piston in association with the channel means (10) and an inlet valve (12) or the like cooperating with the valve surface (11) and movably supported on the piston rod (5), wherein the piston rod (5) is provided with control valve means (13) operatively connected with the inlet valve means (11,12) for the control thereof, said control valve means (13) being either hydraulically or pneumatically operated, and that the piston rod (5) is provided with a chamber (14) with an auxiliary piston element (15) movably arranged therein and fixed to the inlet valve (12), said chamber (14) is arranged to communicate through the piston rod (5) with a hydraulic fluid source (19) for controlling the movements of the auxiliary piston element (15) and, thus, the operation of the inlet valve means (11,12), and characterised in that a hydraulic control and a control logic are provided for timing of operation of the control valve (13) such that the inlet valve (12) is arranged to open when the piston (4) is moving up.
- A two-stroke crosshead engine according to claim 1, characterised in that the control valve means (13) are urged by spring means (17) towards the closing position of the inlet valve means (11,12).
- A two-stroke crosshead engine according to claim 1 or 2, characterised in that the channel means (10) comprise a number of separate channels (10) arranged to be continuously in connection with a scavenge air supply source (6).
- A two-stroke crosshead engine according to any one of the preceding claims, characterised in that the means (18) for providing for ignition and combustion include injection valve means for feeding fuel into the cylinder
- A two-stroke crosshead engine according to any one of the preceding claims 1 to 3, characterised in that the means (18) for providing for ignition and combustion include spark plug means and in that fuel is arranged to be mixed with the scavenge air before feeding it into the cylinder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20075162A FI120212B (en) | 2007-03-08 | 2007-03-08 | Improved two stroke engine |
PCT/FI2008/050043 WO2008107515A1 (en) | 2007-03-08 | 2008-02-06 | Improved two-stroke engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2115276A1 EP2115276A1 (en) | 2009-11-11 |
EP2115276B1 true EP2115276B1 (en) | 2015-07-15 |
Family
ID=37930074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08709311.8A Active EP2115276B1 (en) | 2007-03-08 | 2008-02-06 | Improved two-stroke engine |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2115276B1 (en) |
KR (1) | KR101302254B1 (en) |
CN (1) | CN101636560B (en) |
DK (1) | DK2115276T3 (en) |
FI (1) | FI120212B (en) |
WO (1) | WO2008107515A1 (en) |
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FR2917121A1 (en) * | 2007-06-06 | 2008-12-12 | Michel Alain Leon Marchisseau | DEVICE AND METHOD FOR LUBRICATING, COOLING AND IMPROVING THE OUTPUT OF ALTERNATE PISTON MOTORS |
JP2012202403A (en) * | 2011-03-23 | 2012-10-22 | Waertsilae Schweiz Ag | Cylinder structure and piston for longitudinally flushed stroke piston internal combustion engine |
TWM432153U (en) | 2011-11-11 | 2012-06-21 | Cipherlab Co Ltd | Dual polarized antenna |
CN103016136A (en) * | 2012-12-14 | 2013-04-03 | 西华大学 | High-supercharged two-stroke direct injection engine and ventilation method thereof |
GB2535692B (en) * | 2015-01-15 | 2017-07-12 | Libertine Fpe Ltd | A piston expander with transfer valve assembly |
EP3219970A1 (en) * | 2016-03-17 | 2017-09-20 | Winterthur Gas & Diesel AG | Cylinder for a longitudinally wound two-stroke large disel engine and large diesel engine |
CN107355308B (en) * | 2017-06-02 | 2019-03-22 | 中国北方发动机研究所(天津) | A kind of piston structure of built-in valve |
JP6359734B1 (en) * | 2017-07-25 | 2018-07-18 | 幸徳 川本 | 2-stroke engine |
CN108180284A (en) * | 2018-02-11 | 2018-06-19 | 泓道(上海)科技有限公司 | Piston component and the cylinder for including it |
CN111237078A (en) * | 2020-01-16 | 2020-06-05 | 西华大学 | Piston connecting rod mechanism of two-stroke engine |
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JPS6165013A (en) * | 1984-09-06 | 1986-04-03 | Mitsubishi Heavy Ind Ltd | Two-cycle diesel engine |
CN2057957U (en) * | 1989-02-28 | 1990-06-06 | 杨炳南 | Piston intake type internal combustion engine |
EP0475947A4 (en) * | 1989-06-07 | 1992-04-01 | Aardvark Pty. Ltd | Internal combustion engine |
DE3940826A1 (en) * | 1989-12-11 | 1991-06-13 | Josef Smidrkal | Valve system for free-piston IC engine - incorporates inlet and outlet valves within piston |
JPH094459A (en) * | 1995-06-21 | 1997-01-07 | Isuzu Ceramics Kenkyusho:Kk | Four-cycle engine having auxiliary chamber |
US5596955A (en) * | 1995-10-02 | 1997-01-28 | Szuba; Louis | Internal combustion engine |
AUPQ092199A0 (en) * | 1999-06-14 | 1999-07-01 | Aardvark Pty. Ltd. | Internal combustion engine |
JP2006505744A (en) * | 2002-11-08 | 2006-02-16 | フレディー, レイ ロバーツ, | Improved exhaust control internal combustion engine |
DE102004013461B4 (en) * | 2004-03-18 | 2007-03-01 | Rolka, Gerard, Dipl.-Ing. | Combustion 4-stroke piston engine with axialstromigem cyclical gas exchange in the cylinder and centrally located split combustion chamber |
US7194989B2 (en) * | 2005-03-03 | 2007-03-27 | Samuel Raymond Hallenbeck | Energy efficient clean burning two-stroke internal combustion engine |
-
2007
- 2007-03-08 FI FI20075162A patent/FI120212B/en not_active IP Right Cessation
-
2008
- 2008-02-06 DK DK08709311.8T patent/DK2115276T3/en active
- 2008-02-06 EP EP08709311.8A patent/EP2115276B1/en active Active
- 2008-02-06 CN CN200880007654XA patent/CN101636560B/en active Active
- 2008-02-06 WO PCT/FI2008/050043 patent/WO2008107515A1/en active Application Filing
- 2008-02-06 KR KR1020097020938A patent/KR101302254B1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
KR20090128459A (en) | 2009-12-15 |
CN101636560A (en) | 2010-01-27 |
CN101636560B (en) | 2012-02-22 |
FI120212B (en) | 2009-07-31 |
EP2115276A1 (en) | 2009-11-11 |
WO2008107515A1 (en) | 2008-09-12 |
FI20075162A0 (en) | 2007-03-08 |
FI20075162A (en) | 2008-09-09 |
DK2115276T3 (en) | 2015-10-26 |
KR101302254B1 (en) | 2013-09-02 |
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