CN1181122A - Internal combustion engine having coke scraping ring in cylinder - Google Patents
Internal combustion engine having coke scraping ring in cylinder Download PDFInfo
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- CN1181122A CN1181122A CN96193195A CN96193195A CN1181122A CN 1181122 A CN1181122 A CN 1181122A CN 96193195 A CN96193195 A CN 96193195A CN 96193195 A CN96193195 A CN 96193195A CN 1181122 A CN1181122 A CN 1181122A
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- piston
- cylinder
- ring
- scraping ring
- coke scraping
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
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- 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
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
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- 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
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- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F2001/006—Cylinders; Cylinder heads having a ring at the inside of a liner or cylinder for preventing the deposit of carbon oil particles, e.g. oil scrapers
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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
- F02F7/00—Casings, e.g. crankcases or frames
- F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
A two-stroke crosshead engine with uniflow scavenging has a coke scraping ring in a cylinder and a piston (18) longitudinally displaceable in the cylinder and provided with piston rings (19, 19') which slide along the substantially cylindrical inner surface of the cylinder at the displacement of the piston and create a pressure-sealing separation between the volume below the piston and the working chamber (20), which is located above the uppermost piston ring of the piston and is defined by the uppermost piston ring (19'), the piston (18), the inner surface of the cylinder and the cylinder cover (8). The coke scraping ring (23) protrudes from the inner surface of the cylinder and extends annularly along it in an axial position so that the uppermost piston ring is positioned near the lower edge of the coke scraping ring when the piston is in its top dead centre position. In its cylindrical inner surface the coke scraping ring (23) is provided with several leakage grooves (24) which extend obliquely relative to the longitudinal axis of the cylinder from the lower surface to the top surface of the coke scraping ring. Alternatively, the leakage grooves may be provided in the cylindrical outer surface of the uppermost piston section (21) positioned above the uppermost piston ring.
Description
The present invention relates to a kind of internal-combustion engine, this internal-combustion engine has a coke scraping ring and a piston that can be along the longitudinal movement and be provided with piston ring in cylinder is arranged in cylinder, these piston rings columnar basically internal surface along cylinder when piston moves slides and generation wiper seal isolation between volume below the piston and working room, the working room is placed in the upper piston ring top of piston and by upper piston ring, piston, cylinder face and cylinder head form, coke scraping ring protrudes and extends in circlewise the axial position from cylinder face, makes when piston is positioned at its top dead center position this upper piston ring be positioned near the coke scraping ring lower limb.
The known four stroke engine that is provided with intake valve and exhaust valve in cylinder head has a coke scraping ring.The purpose of coke scraping ring is to scrape off deposits of coke (carbon deposit) from the cylindrical upper piston section that is placed in upper piston ring top.
Upper piston ring forms the lower limit in the annular space internal furnace between upper piston section and the cylinder face above the piston ring.Therefore, a part of products of combustion will enter this annular space and be deposited on the outer surface of upper piston section.Lubricant oil from cylinder face also may spatter and drop on this outer surface.The heat-flash that the draff of oil and the products of combustion of deposition are burnt influences, and is converted into the coke layer that adheres on the outer surface of piston when motor moves.If do not use coke scraping ring, the thickness of coke layer will increase, up to the internal surface of its contact cylinder.
For fear of the damage of cylinder and piston ring, it is important keeping a proper lubrication oil thin layer between these parts that can move mutually.When the coke layer on the piston side face gathers its maximum ga(u)ge and contacts with cylinder face, it will disturb with oil sheet and absorb and/or scrape off some oil, and this influences lubricating status negatively.In the worst case, will degenerate partly piston ring or lining of lubricating status produces damage.
The thickness of the coke scraping ring limit coke layer in the known four-stroke motor, its process are to shift near its top dead center position and upper piston section during back and forth by coke scraping ring when piston, and the ring edge up and down of coke scraping ring is scraped the coke at these edges of flat contact.Because coke scraping ring protrudes from the internal surface of cylinder,, coke layer do not make the thickness that contacts between coke layer and the cylinder face so just can not reaching.
Because the motor of known band coke scraping ring is a kind of four stroke engine and intake valve and exhaust valve in the four stroke engine is arranged in cylinder head, so other operational condition major part of motor is not benefited from the influence without coke scraping ring.In four stroke engine, the scavenging of cylinder realizes by the independently stroke of piston between each working stroke, and the air of supply burning be by the back with downward suction stroke in provide by intake valve from top to bottom.Therefore, the scavenging of coke scraping ring countercylinder and inflation do not exert an influence.One of the favourable outcome that coke scraping ring obtains in the four stroke engine more key factor to be piston itself with respect to cylinder face mobile.The four-stroke cycle is relating to a different loads on piston in up stroke once, also be like this in the downward stroke that loadtype changes.The result is, changes all the time near the piston warp-wise position of top dead center position, makes the degree of depth that coke scraping ring scrapes off coke greater than the corresponding degree of depth of itself internal diameter, produces a play automatically thus between topped upper piston section of coke and coke scraping ring.Situation is not so simple in the two-stroke cross head h type engine h with the effect of single current retaining gas, and employing experiment of known coke scraping ring from four stroke engine has shown the operational issue of trouble, these problems are that the consumption of special fuel increases, particularly upper piston ring sustains damage, back one problem is wondrous, in fact should improve the lubricating status of these piston rings because originally be contemplated that coke scraping ring.
The objective of the invention is to remedy above-mentioned shortcoming and make and in a two-stroke cross head h type engine h, advantageously to utilize a coke scraping ring.
In view of this, the invention is characterized in, this motor is a kind of two-stroke cross head h type engine h with single current scavenging, a plurality of removing air holes of cylinder section down that are arranged in are arranged, coke scraping ring is provided with some leakage grooves in its drum type inner surface, these leakage grooves are extended to the vertical axis tilt ground of end face with respect to cylinder from the lower surface of coke scraping ring.
Suppose that the known shown shortcoming of coke scraping ring of use can be explained with following mechanism in two stroke engine.Piston is finished a compression stroke at every turn and finish a working stroke at every turn during being moved down during moving up in the two-stroke cross head h type engine h.This means that each piston is during up and down by coke scraping ring, piston loads in the same mode of major part, so piston is finished one evenly and the moving picture that repeats near place, dead center position, top.Owing to crosshead is strengthened, the longitudinal axis of the lower end edge cylinder of this crosshead guiding piston rod carries out the pure translation motion towards the tendency of even moving picture.Therefore the coke that is deposited on the piston side face will be accumulated to a shape that by chance cooperates coke scraping ring, so that have very little play between coke scraping ring and upper piston section.When piston head during by the coke scraping ring in the compression stroke, one between the outer surface of the piston of band coke layer and coke scraping ring that the toroidal cavity between the cylinder face is limited to protrusion vertically and upper piston ring.The moving upward of piston shortened toroidal cavity vertically fast, compresses the air in the toroidal cavity subsequently consumingly, and this air produces a strong increased load on upper piston ring.
Leakage grooves in the drum type inner surface of coke scraping ring reduces or eliminates accumulation of pressure in this toroidal cavity, because air wherein can escape in a part of working room of piston head top by leakage grooves.This makes upper piston ring avoid suffering because the existence of coke scraping ring and increased load.This factor is a particular importance in the large-sized two-stroke cross head engine of now, and this motor is towards high effective compression ratio (as 1: 16 to 1: 20) development, and this is created in the very big load on the piston ring in motor self.
The inclination stroke of leakage grooves can guarantee coke with the opposed zone of leakage grooves in also wiped off.The coke laydown part relative with the under shed of leakage grooves will can not run into the lower limb of coke scraping ring, but will also be wiped off desired size herein by the top edge of leakage grooves during continuous piston moves upward.The carbon granule of wiping off in groove is upwards fed in the space above the piston by the leakage air of advertising by groove.
In addition, leakage grooves is offset the fuel consumption that increases.If there is not leakage grooves, when piston head is positioned at a height that is equal to or higher than coke scraping ring, effectively piston area will reduce during the first portion of burning, import upper piston ring downwards into because coke scraping ring will stop the pressure in the working room to increase, to locate the whole sectional area that effective piston area covers cylinder at this.Leakage grooves reduces or the pressure eliminated across coke scraping ring falls during compression stroke and working stroke, so the influence without coke scraping ring is not benefited from the consumption of special fuel basically.
In having high cylinder output as 1500 to 5500KW large-sized two-stroke diesel engine, coke scraping ring has another particularly advantageous effect, and fuel utilizes the fuel injector of the specific atomized fuel mist of two, three or four emission directions to spray into cylinder in this motor.The burning of fuel produces the heat affecting of quite concentrating; but piston also only makes hot gas lead to piston by leakage grooves near its top dead center position (this place thermal load maximum) because coke scraping ring covers upper piston ring; distribute so upper piston ring is crossed in thermal load more equably, thus protect simultaneously on the cylinder face to heat sensitive lubricant oil thin layer (oil film).Two factors help the better operational condition of piston ring encapsulation and increase the effect that prevents the contact lubricated oily thin layer of coke on the piston.
As the possible alternative that leakage grooves is set in the coke scraping ring drum type inner surface, also can design the internal-combustion engine of in foreword, mentioning that coke scraping ring is arranged within the scope of the invention in cylinder, its mode is characterised in that, this motor is a kind of two-stroke cross head h type engine h with single current scavenging, a plurality of scavenging air holes of cylinder section down that are arranged in are arranged, the upper piston section that is arranged in upper piston ring top is provided with some leakage grooves at its cylindrical outer surface, and they extend downwardly into the zone of the circular groove with upper piston ring from the top of piston section.In this case, the drum type inner surface of coke scraping ring can form a cylinderical surface that adheres to.During each engine cycle, leakage grooves is by compressed air stream and two kinds of air-flows of combustion gas, and they prevent that coke laydown is in groove.
In one embodiment, the columnar basically internal surface of cylinder is made of a loam cake section and a following lining section, and coke scraping ring is placed in the top of lining section.Coke scraping ring can be a ring that tightens in the groove of lining internal surface, also can be a projection in the material of lining own, i.e. lining integrally formed attachment portion.Under latter event, lining when it assembles, drop in the motor before the position must the mounting strap piston rod piston, make and upwards pass through lining below the piston.Under first kind of situation, this embodiment is provided at the favourable possibility that a coke scraping ring is installed in the back on the existing motor.
In another embodiment, the columnar basically internal surface of cylinder is made of a loam cake section and a following lining section, and coke scraping ring is placed in the bottom of covering section.Equally in this case, coke scraping ring can be one in the groove that is inserted in the loam cake section independently ring or form with the lid section is whole, the bottom of this lid section forwards the littler internal diameter of section that a ratio is settled above subtly to.If leakage grooves is placed in the coke scraping ring, they can operate the described lowermost part that enters this lid section subsequently.This another embodiment is specially adapted to run into the cylinder of extra-high-speed thermal load, and cylinder head is made with a kind of material more heat-resisting than lining under this occasion.Cover in the section by coke scraping ring is placed in, the insulation surfaces between lining and the lid can be moved down into the zone above tight, the position of the upper piston ring in top dead center position.
Situation is the 0.25-50% that leakage grooves constitutes the axial area of the coke scraping ring that protrudes from the drum type inner surface basically of cylinder preferably, its 5-40% better, and its 20-30% preferably.If the area of leakage grooves less than 0.25%, cross over so the pressure of coke scraping ring fall just too big, and at leakage area greater than 50% o'clock positive effect of just not reentrying.5% limit still produces pressure and falls, in any case but operational condition be significantly improved, and 40% limit can prevent fully satisfactorily that usually the pressure of crossing over coke scraping ring from falling.Area in the interval of 20-30% is formed in and wish obtains little pressure and fall or do not have pressure to fall and wish suitable compromise between the uniform distribution thermal load.
For the single current scavenging engine, the scavenging air Kongzui is near the opening of piston upper surface fortunately, the protrusion that this means coke scraping ring must be not far from cylinder face, because the result of the annular space excessive width between coke layer and the cylinder face is, near the passage the upper piston ring of the upside in hole will be opened these holes at the end of working stroke.Therefore, for 250 to 1000mm casing bores at interval, coke scraping ring preferably protrudes 0.2mm at least from the internal surface of cylinder, as 0.5 to 5mm.0.2mm or the lower limit of 0.5mm guarantees to block the gas air hole fully, passes through up to the upper piston surface.In the motor of maximum, coke scraping ring can protrude 1mm at least suitably, 2-3mm for example, and 0.5-2mm may be suitable to puffer.If coke scraping ring protrudes less than 0.25mm, just more difficult coke laydown certainly can not contact the lubricant oil thin layer on the cylinder face.
Preferably, the upper piston section that is positioned at upper piston ring top have one than the band piston ring at the littler diameter of settling down of piston section, and the internal diameter of coke scraping ring is than the big at least 0.5mm of diameter of upper piston section, 2-6mm for example, that suitable is big 1-4mm.Adopt these natural scales, coke layer can be accumulated to the thickness of 0.5-3mm, suitably is 0.75-2mm, and this forms the suitable play of a piston radial position with respect to coke scraping ring, and does not have the danger of piston periphery contact coke scraping ring.
Within the scope of the invention, can allow coke scraping ring protrude more fartherly, correspondingly reduce simultaneously the diameter of upper piston section, make to have big thickness around the annular space of this piston section and cylinder face than above-mentioned from cylinder face.A kind of like this design will bring early opening of scavenging air hole, just at the working stroke end upper piston ring by the time, and timing and other engine parameter of opening timing that depends on the scavenging air hole of opening exhaust valve must change according to early supplying with of scavenging air then.
The number of the leakage grooves in coke scraping ring or the piston depends on the required homogenization degree of required leakage area and upper piston ring heat loads on board, such as bigger leakage area and thermal load uniformly distribute and use the more leakage grooves of number.Coke scraping ring or piston can be provided with 4 to 30 leakage grooves suitably.
Leakage grooves is preferably more than 15, because the homogenization of upper piston ring heat loads on board is had very big benefit.
If leakage grooves forms in the periphery of upper piston section, they can advantageously be parallel to cylinder axis extends, and makes the coke fragments of any fragmentation can not fall into leakage grooves immediately and produce the danger of blocking leakage grooves subsequently.Or the number of leakage grooves and size are selected can the leakage grooves in coke scraping ring, referring to following description.
Accompanying drawing below with reference to signal to heavens illustrates in greater detail embodiments of the invention, in the accompanying drawing.
Fig. 1 represents the sectional view that has according to the simplification of the motor of coke scraping ring of the present invention by a kind of;
Fig. 2 is the partial cross section figure of the amplification section of coke scraping ring peripheral region in the cylinder in the motor of Fig. 1;
Fig. 3 is the expansion side view of a part of coke scraping ring;
Fig. 4 is the top plan view of one section coke scraping ring;
Fig. 5 is the perspective view of the upper piston section of band leakage grooves in the upper piston ring upper area; And
Fig. 6 is another embodiment's the corresponding views of the piston of band leakage grooves.
Illustrative motor is the purple oil turbine of a kind of large-sized two-stroke among Fig. 1, have the single current scavenging arrangement and make fuel with oil (as heavy fuel oil), and the burning formation residue of oil, the latter may be deposited on the surface in the engine operation chamber becomes coke.The size and the number that depend on cylinder, motor may produce from 2000 output powers to (for example) 70000KW.A kind of like this motor is used as master motor or stationary power generation machine of boats and ships usually.In both cases importantly motor can work need very over a long time and not the check and repairing engine components.People wish to start the function continuous operation to surpass 2 years and do not need any maintenance, but at this moment cylinder part requires best as far as possible operating conditions.
The static part of motor comprises the base plate 1 and the engine frame case 3 that is installed on the base plate, cylinder part 4 of the latter's upper surface upper support of wherein settling bent axle 2.Cylinder liner 5 utilizes the stud 7 of lid and cylinder head 8 to clamp facing to the top board in the cylinder part downwards.Cylinder liner is with epimere and elongated lower end of a heavy wall, and this epimere is placed on the upper surface of top board by annular intermediate member 9, and this hypomere stretches into downwards in the cylinder part 4.In its lower end, cylinder liner has a plurality of scavenging airs hole 10, when piston during near its bottom dead center position, flows into cylinders from the scavenging and the inflation air of scavenging air storage 11 by these pores 10.The exhaust valve housing 12 that has the hydraulic transmission exhaust valve is placed in the center of cylinder head.When exhaust valve was opened, the scavenging air that comes from the scavenging air hole can upwards flow by cylinder, and combustion gas simultaneously flows out into exhaust storage 13 by exhaust valve, and combustion gas flows into outlet pipe from this through turbosupercharger.Motor is enhanced pressure to for example inflation pressure of 3.5-4 crust.
Connecting rod 14 makes bent axle 2 be connected with crosshead 15, and the lower end edge casing longitudinal axis of the guide surface 16 guiding piston rods 17 in the The latter motor mounting case moves back and forth.Piston 18 is installed in the top of piston rod.As being clearly shown that among Fig. 2, piston has several (as 4) piston rings 19,19 ', they along the internal surface of cylinder liner slide and volume below working room 20 and piston between produce wiper seal and isolate, this volume is communicated with the cavity that is filled with scavenging air in cylinder part.
Firing chamber or working room 20 form by the internal surface of cylinder head 8, the internal surface of cylinder liner 5, the top of piston 18, uppermost piston ring 19 ' with from the side face of the epimere 21 of the upwardly extending piston of uppermost piston ring.The diameter of the epimere 21 of piston is littler than piston lower part, so between epimere outer surface of piston and the cylinder face annular space 22 is arranged, and wherein coke will be deposited on the outer surface of piston.
An annular coke scraping ring 23 in the cylinder protrudes and scrapes off charred ashes on the outer surface that is deposited on the epimere 21 of piston from cylinder face, makes these depositions can not surpass the maximum diameter corresponding to the coke scraping ring internal diameter.Preferably, coke scraping ring have along cylinder axis to the position, make when piston is positioned at illustrated its top dead center position upper piston ring 19 ' below coke scraping ring 23 less than a ring height, because this guarantees that coke layer goes up more than the ring major part most up to piston and wiped off.But even the coke scraping ring position is higher slightly, for example also high 2 to 3 ring height also still can obtain to scrape significantly the charcoal effect.
Fig. 3 and Fig. 4 represent that the internal surface of coke scraping ring is provided with some leakage grooves 24, and they make the airflow connection between all the other epimeres of the part of coke scraping ring below annular space 22 and working room 20.The circulation area of leakage grooves is suitably cooperated, thereby the pressure of leap coke scraping ring falls and can ignore.Leakage grooves preferably evenly distributes along the coke scraping ring inner peripheral surface, because this thermal load that piston is gone up on the ring 19 ' most is the most even.The degree of depth of leakage grooves can be corresponding to the extrude depth of coke scraping ring with respect to cylinder face.If coke scraping ring only protrudes a 0.25mm at least from internal surface, as the small distance of 0.5-3mm, this is particularly advantageous so.If piston and coke scraping ring are made in such a way, be exactly annular space 22 have big width and scavenging air mouth 10 since piston go up most ring pass through open, the degree of depth of leakage grooves must be less than the thickness of the inside projection of coke scraping ring so.Preferably the degree of depth of leakage grooves is not more than 3 to 4mm, because may become too big by the air-flow of the bigger single groove of the degree of depth, so that the thermal load that encircles on of the piston part that will become is too high.The degree of depth of groove is not more than 1.5-2mm and the leakage grooves number is suitably many, as 15 or more, can obtain thermal distribution very uniformly.
The width of leakage grooves is to be that total groove end face is selected on to the basis of axial sectional area at the degree of depth of leakage grooves number, groove and required total flow area.Well width is 5 to 30mm in most of the cases to be suitable, and in order to obtain uniform thermal load, well width is preferably 10 to 20mm.
Fig. 5 and Fig. 6 represent that leakage grooves is positioned at the embodiment on the epimere outer surface of piston.For simplicity's sake, the parts with above-mentioned same-type adopt same label.Also should be noted that and saved piston ring among the figure.
Among Fig. 5, the piston left side is illustrated in the zone of coke scraping ring 23 ' the vertical section by the penetrale of lining 5 and cylinder head 8, and coke scraping ring 23 ' directly forms in the material of cylinder head, also promptly as an integral body and the relevant part of cylinder head.The piston back illustrates the corresponding vertical section by another kind design, and wherein coke scraping ring 23 ' is directly made in the material of cylinder liner, also promptly as an integral body and the relevant part of lining.Relatively the left and right sides of this figure can be found out immediately, can obtain following advantage in same motor, exactly coke scraping ring 23 ' is placed in the cylinder head, insulation surfaces 27 vertically the moving down along cylinder between feasible lid and the lining.Because the internal surface of lid does not constitute the operation surface of piston ring, so when selecting the material of lid, can not consider lubricating requirement and sliding capability.Therefore, lid can be made with a kind of material more corrosion-resistant and more heat-resisting than lining material (as steel), and the lining material is generally cast iron.Heat affecting is maximum in the cylinder upper zone, therefore by making the more downward extension of lid can make the cylinder life-span longer.
In the illustrated embodiment, coke scraping ring 23 ' or be positioned on the lining 5 or among, perhaps be positioned at cover on 8 or among, coke scraping ring has a drum type inner surface 28, this surface is an annular, does not have leakage grooves.Certainly, some leakage grooves can be placed on the coke scraping ring and some are placed on the piston, but for for the purpose of easily manufactured, described design is preferred that it can (for example) be made by the internal surface that suitably rotates lining or lid.
Leakage grooves 24 ' is placed in the upper curtate 21 of piston and goes up circular groove 29 most from what the fillet of piston upper periphery extended downwardly into that piston goes up ring 19 ' most.The height of the upper curtate 21 of piston is very big, therefore when piston is positioned at its top dead, piston ring be arranged in cylinder below, this advantageously further extends cylinder head and depresses cylinder.
The angle of about γ=30 of vertical formation of leakage grooves among Fig. 5 and cylinder °.In practice, this angle can or more be selected between the wide-angle at 0 ° to 60 °, but preferably this groove forms one at least 15 ° angle along at least a portion of its length, with the upper and lower end parts that prevents groove vertically one drop on above another.
Fig. 6 represents another embodiment of piston, and wherein leakage grooves 24 " an epimere 24a who extends abreast with casing longitudinal axis and one and its hypomere 24b that extends obliquely arranged.The hypomere 24b of this inclination makes the underpart of groove move along peripheral direction with respect to the upper end portion of groove, and coke is wiped off along full periphery.Therefore the epimere 24a of leakage grooves does not exist the danger of the coke granule obstruction of being wiped off to wiping coke and inoperative off.Also the tilting section of leakage grooves can be arranged in the upper end of groove, its advantage be when scrape sweep when producing higher by the gas velocity of groove because the movement velocity of piston is higher when the epimere of groove passes through coke scraping ring.
When utilizing an independently piston head that is fixed on the piston section that has below being placed in of the circular groove used for piston ring to produce sizable height of the epimere 21 of piston, the design of the groove section of the inclination of the sort of lower end that is illustrated in groove is particularly advantageous.In this case, two of leakage grooves sections can manufacture straight-line groove in the respective pistons section with plain mode.
Under other situation, with regard to area and number, leakage can form corresponding to the leakage grooves that is configured in the coke scraping ring.
Claims (10)
1. internal-combustion engine, this internal-combustion engine has a coke scraping ring and has one can be along the longitudinal movement in cylinder and be provided with piston ring (19 in cylinder, 19 ') piston (18), these piston rings (19,19 ') the columnar basically internal surface along cylinder slides and generation wiper seal isolation between volume below the piston and working room (20) when piston moves, working room (20) is placed in the upper piston ring top of piston and by upper piston ring (19 '), piston (18), cylinder face and cylinder head (8) form, coke scraping ring (23) protrudes also from cylinder face and extends in circlewise the axial position, make when piston is positioned at its top dead center position this upper piston ring be positioned near the coke scraping ring lower limb, it is characterized in that, this motor is a kind of two-stroke cross head h type engine h with single current retaining gas, a plurality of scavenging air holes (10) of cylinder section down that are arranged in are arranged, and coke scraping ring (23) is provided with some leakage grooves (24) in its drum type inner surface, and these leakage grooves are extended to the vertical axis tilt ground of end face with respect to cylinder from the lower surface of coke scraping ring.
2. internal-combustion engine, this internal-combustion engine has a coke scraping ring and has one can be along the longitudinal movement in cylinder and be provided with piston ring (19 in cylinder, 19 ') piston (18), these piston rings (19,19 ') the columnar basically internal surface along cylinder slides and generation wiper seal isolation between volume below the piston and working room (20) when piston moves, working room (20) is placed in the upper piston ring top of piston and by upper piston ring (19 '), piston (18), cylinder face and cylinder head (8) form, coke scraping ring (23) protrudes also from cylinder face and extends in circlewise the axial position, make when piston is positioned at its top dead center position this upper piston ring be positioned near the coke scraping ring lower limb, it is characterized in that, this motor is a kind of two-stroke cross head h type engine h with single current scavenging, a plurality of scavenging air holes (10) of cylinder section down that are arranged in are arranged, and the cylindrical external surface that is positioned at the upper piston section (21) of upper piston ring top is provided with some leakage grooves (24 '), and these leakage grooves extend downwardly into the zone with the circular groove of upper piston ring (19 ') from piston section top.
3. an internal-combustion engine according to claim 1 and 2 is characterized in that, the columnar basically internal surface of cylinder is made of a loam cake section and a following lining section, and coke scraping ring (23,23 ') is positioned at the place, top of lining section (5).
4. an internal-combustion engine according to claim 1 and 2 is characterized in that, the columnar basically internal surface of cylinder is made of a loam cake section and a following lining section, and coke scraping ring (23,23 ') is positioned at the place, bottom of lining section (5).
5. one kind according to claim 3 or 4 described internal-combustion engines, it is characterized in that coke scraping ring (23,23 ') is the whole attachment portion of cylinder liner or upper cover part, are manufactured into the projection in the material of cylinder liner or lid section.
One kind require according to aforesaid right in any one described internal-combustion engine, it is characterized in that, leakage grooves (24,24 ') constitute the coke scraping ring (23 that protrudes from the columnar basically internal surface of cylinder, the 0.25-50% of axial area 23 '), its 5-40% preferably, only is its 20-30%.
One kind require according to aforesaid right in any one described internal-combustion engine, it is characterized in that casing bore is in the interval of 250-1000mm, and coke scraping ring (23,23 ') protrudes 0.2mm at least from the internal surface of cylinder, preferably protrudes 0.5-5mm.
One kind require according to aforesaid right in any one described internal-combustion engine, it is characterized in that, the diameter of upper piston section (21) that is positioned at upper piston ring (19 ') top is less than the diameter that is placed in following piston section of band piston ring, and coke scraping ring (23,23 ') internal diameter is than the big at least 0.5mm of diameter of upper piston section, for example big 2-6mm, preferably big at least 1mm, for example big 3-4mm.
One kind require according to aforesaid right in any one described internal-combustion engine, it is characterized in that coke scraping ring (23,23 ') or upper piston section (21) are provided with 4-30 leakage grooves, preferably more than 15 leakage grooves.
One kind require according to aforesaid right in any one described internal-combustion engine, it is characterized in that the longitudinal axis of leakage grooves (24,24 ') and cylinder axis be to the angle of 0 °-60 ° of formation, better be at least 15 ° and optimum be 45 °.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK199500804A DK174074B1 (en) | 1995-07-07 | 1995-07-07 | Combustion engine with a coke scraping ring in a cylinder |
| DK0804/95 | 1995-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1181122A true CN1181122A (en) | 1998-05-06 |
| CN1080821C CN1080821C (en) | 2002-03-13 |
Family
ID=8097766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96193195A Expired - Lifetime CN1080821C (en) | 1995-07-07 | 1996-06-28 | Internal combustion engine having coke scraping ring in cylinder |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0837982B1 (en) |
| JP (1) | JP3202243B2 (en) |
| KR (1) | KR100291822B1 (en) |
| CN (1) | CN1080821C (en) |
| DE (1) | DE69601375T2 (en) |
| DK (1) | DK174074B1 (en) |
| ES (1) | ES2127645T3 (en) |
| HR (1) | HRP960326B1 (en) |
| PL (1) | PL179372B1 (en) |
| RU (1) | RU2153089C2 (en) |
| WO (1) | WO1997003280A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102971517A (en) * | 2010-06-08 | 2013-03-13 | 瓦锡兰芬兰有限公司 | Cylinder liner of a reciprocating engine |
| CN103147871A (en) * | 2011-12-07 | 2013-06-12 | 瓦锡兰瑞士公司 | Piston and cylinder assembly for reciprocating compressor combustion machine and method for removing deposits from piston |
| CN109869239A (en) * | 2019-04-15 | 2019-06-11 | 一汽解放汽车有限公司 | A kind of engine piston |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2763362A1 (en) * | 1997-05-13 | 1998-11-20 | Semt Pielstick | Carbon scraper for top of internal combustion engine piston |
| EP0935061B1 (en) * | 1998-02-05 | 2004-02-25 | GE Jenbacher GmbH & Co. OHG | Stationary gas engine |
| EP0995890A1 (en) * | 1998-10-20 | 2000-04-26 | Wärtsilä NSD Schweiz AG | Cylinder for an internal combustion engine |
| KR100533489B1 (en) * | 2002-05-21 | 2005-12-06 | 맨 비 앤드 더블유 디젤 에이/에스 | Cylinder frame and modular scavenge air receiver |
| US7438037B2 (en) * | 2003-10-16 | 2008-10-21 | Kabushiki Kaisha Riken | Internal combustion engine and liner installation ring |
| US7438039B2 (en) * | 2004-02-06 | 2008-10-21 | Electro-Motive Diesel, Inc. | Large-bore, medium-speed diesel engine having piston crown bowl with acute re-entrant angle |
| DE102006060330A1 (en) * | 2006-12-20 | 2008-06-26 | Mahle International Gmbh | Insert for a cylinder liner or a cylinder of an internal combustion engine |
| US8020530B2 (en) * | 2007-06-15 | 2011-09-20 | Federal-Mogul Corporation | Piston and internal combustion engine therewith and method of constructing the piston |
| EP2243940A1 (en) * | 2009-04-06 | 2010-10-27 | Wärtsilä Schweiz AG | Reduction device for reducing gas pressure in the piston ring package of a hydraulic piston combustion engine |
| SE534911C2 (en) * | 2010-06-16 | 2012-02-14 | Scania Cv Ab | Arrangements in an internal combustion engine |
| US9845764B2 (en) | 2015-03-31 | 2017-12-19 | Achates Power, Inc. | Cylinder liner for an opposed-piston engine |
| GB2546313A (en) * | 2016-01-15 | 2017-07-19 | Caterpillar Energy Solutions Gmbh | Turbulators for an internal combustion engine |
| 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 |
| US11299362B2 (en) | 2017-06-23 | 2022-04-12 | Kimberly-Clark Worldwide, Inc. | Tension regulating directly driven roller festoon |
| CN207418661U (en) * | 2017-09-06 | 2018-05-29 | 大连亨利测控仪表工程有限公司 | A kind of new gooseneck metallurgy coking gas controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE800448C (en) * | 1949-06-01 | 1950-11-06 | Maschf Augsburg Nuernberg Ag | Piston seal, especially for internal combustion engines |
| US3489130A (en) * | 1968-01-10 | 1970-01-13 | Sealed Power Corp | Piston and cylinder construction |
| US3476099A (en) * | 1968-02-26 | 1969-11-04 | Int Harvester Co | Head,gasket,and protector assembly and method |
| CH596479A5 (en) * | 1975-08-26 | 1978-03-15 | Sulzer Ag | |
| US4474147A (en) * | 1981-12-10 | 1984-10-02 | Mack Trucks, Inc. | Combined fire ring and carbon scraping insert |
| DE3543668A1 (en) * | 1985-12-11 | 1987-06-19 | Man Nutzfahrzeuge Gmbh | CYLINDER BUSHING FOR PISTON COMBUSTION ENGINES |
| CH672353A5 (en) * | 1987-05-14 | 1989-11-15 | Sulzer Ag | Cylinder lining for IC engine - has cylinder wall shoulder, protruding into combustion chamber above top piston ring level |
-
1995
- 1995-07-07 DK DK199500804A patent/DK174074B1/en not_active IP Right Cessation
-
1996
- 1996-06-28 JP JP50542397A patent/JP3202243B2/en not_active Expired - Lifetime
- 1996-06-28 PL PL96322366A patent/PL179372B1/en unknown
- 1996-06-28 ES ES96922776T patent/ES2127645T3/en not_active Expired - Lifetime
- 1996-06-28 CN CN96193195A patent/CN1080821C/en not_active Expired - Lifetime
- 1996-06-28 DE DE69601375T patent/DE69601375T2/en not_active Expired - Lifetime
- 1996-06-28 RU RU97117450/06A patent/RU2153089C2/en active
- 1996-06-28 EP EP96922776A patent/EP0837982B1/en not_active Expired - Lifetime
- 1996-06-28 WO PCT/DK1996/000295 patent/WO1997003280A1/en active IP Right Grant
- 1996-06-28 KR KR1019970706066A patent/KR100291822B1/en not_active IP Right Cessation
- 1996-07-05 HR HR0804/95A patent/HRP960326B1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102971517A (en) * | 2010-06-08 | 2013-03-13 | 瓦锡兰芬兰有限公司 | Cylinder liner of a reciprocating engine |
| CN102971517B (en) * | 2010-06-08 | 2015-06-10 | 瓦锡兰芬兰有限公司 | Cylinder liner of a reciprocating engine |
| CN103147871A (en) * | 2011-12-07 | 2013-06-12 | 瓦锡兰瑞士公司 | Piston and cylinder assembly for reciprocating compressor combustion machine and method for removing deposits from piston |
| CN109869239A (en) * | 2019-04-15 | 2019-06-11 | 一汽解放汽车有限公司 | A kind of engine piston |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0837982B1 (en) | 1999-01-13 |
| KR19980702660A (en) | 1998-08-05 |
| KR100291822B1 (en) | 2001-09-17 |
| DE69601375T2 (en) | 1999-07-01 |
| PL322366A1 (en) | 1998-01-19 |
| JPH11509288A (en) | 1999-08-17 |
| DK80495A (en) | 1995-07-07 |
| RU2153089C2 (en) | 2000-07-20 |
| DE69601375D1 (en) | 1999-02-25 |
| HRP960326B1 (en) | 2000-02-29 |
| EP0837982A1 (en) | 1998-04-29 |
| HRP960326A2 (en) | 1997-08-31 |
| ES2127645T3 (en) | 1999-04-16 |
| WO1997003280A1 (en) | 1997-01-30 |
| JP3202243B2 (en) | 2001-08-27 |
| CN1080821C (en) | 2002-03-13 |
| DK174074B1 (en) | 2002-05-21 |
| PL179372B1 (en) | 2000-08-31 |
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Owner name: MAN DIESEL ENGINES AND TURBINE GERMAN SUBSIDIARY, Free format text: FORMER NAME: MAN DIESEL AS Owner name: MAN DIESEL AS Free format text: FORMER NAME: MAN DIESEL AS Owner name: MAN DIESEL AS Free format text: FORMER NAME: MAN B + W DIESEL AS. |
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Address after: Copenhagen Patentee after: MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND Address before: Copenhagen Patentee before: MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND Address after: Copenhagen Patentee after: MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND Address before: Copenhagen Patentee before: MAN DIESEL filial af MAN Diesel SE Tyskland Address after: Copenhagen Patentee after: MAN DIESEL filial af MAN Diesel SE Tyskland Address before: Copenhagen Patentee before: MAN B & W DIESEL A/S |
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Granted publication date: 20020313 |
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| EXPY | Termination of patent right or utility model |