KR20160021170A - A method for the lubrication of a large diesel engine as well as a large diesel engine - Google Patents

Abstract

The present invention relates to a large diesel engine comprising: one or more cylinders (2) installed inside a cylinder block (3); and a piston (5) reciprocating along a traveling surface (21) inside the cylinder (2). The piston (5) limits a combustion space (6) and is connected to a crankshaft (10) installed inside a crank housing (4), and lubricant introduced from a lubricating source (62) into a cylinder (2) to lubricate the piston (5) is contaminated by a combustion process taken place in the combustion space (6). The contaminated lubricant is discharged from the cylinder (2) and is guided to a purification device (60) purifying the lubricant before the contaminated lubricant is reached into the crank housing (4). Moreover, the present invention provides the large diesel engine corresponding to a device as described above.

Description

TECHNICAL FIELD [0001] The present invention relates to a lubrication method for a large-sized diesel engine and a large-sized diesel engine.

The method relates to a method of lubrication of a large diesel engine and to a large diesel engine according to the preamble of the independent claims of each category.

Large diesel engines, which can be designed as two-stroke engines or four-stroke engines, are commonly used in marine drives, or in stationary operation, for example for driving large generators for power generation. In this regard, in continuous mode of operation, the motors are operated for a substantial amount of time, which requires high operational reliability and availability. Therefore, especially the long operating life, low wear rate and economical use of working fuel are important criteria for operators.

In this regard, piston lubrication has significant significance. When in the operating state, the cylinder is usually in the form of a cylinder running bush, so that the piston slides along the inner wall of the cylinder. On the one hand, the piston must slip as smoothly as possible without being disturbed in the cylinder, while on the other hand, the piston must be capable of providing a combustion space in the cylinder in order to ensure efficient conversion of the energy released during the combustion process into mechanical work. One must be tightly sealed.

For this reason, during the operation of the diesel engine, the lubricating oil usually flows into the cylinder, achieving excellent running characteristics of the piston, and keeping the wear of the cylinder wall against the piston and the piston ring as small as possible. In addition, the lubricating oil not only neutralizes the corrosive combustion products, but also may prevent corrosion. Due to the high demand, high quality and expensive materials are often used as lubricating oil.

Two separate lubricant systems are currently in use for large two stroke diesel engines with crosshead drives. Some lubrication systems are commonly used to lubricate all bearings or journals, such as crankshafts, crosshead bearings, or crossheads, including so-called system oil or system lubricants, and also frequently used for cooling do. Other lubrication systems are commonly used to lubricate pistons, piston rings, and running surfaces, including certain cylinder oils or cylinder lubricants. The cylinder lubricant is merely a consumable product ("complete loss"), i.e., lubricant is used on the running surface or piston, and after it is contaminated in the combustion space, the residue is collected or discarded. Thus, although cylinder oil is continuously consumed at every cycle of the engine, in most cases, the system lubricant is not a consumable product, i.e., the system lubricant is purified and then reintroduced into the lubricant source.

Normally, only one lubricant is used in a large four-stroke diesel engine with a connecting rod, which is used for piston lubrication and bearing lubrication, and optionally for internal piston cooling. Using these machines, the lubricant contaminated by the combustion process is normally pushed down by a piston moving downward along the running surface of the inner cylinder wall, from the lower end of the cylinder to the lower part of the crank housing and functions as a lubricant source You can fall into the oil pan. In this oil pan, the highly contaminated lubricant in the combustion space is mixed with another lubricant, and due to the considerable volume difference, a very strong dilution of the contaminated lubricant takes place. It is also known to purify the lubricating oil discharged from the oil pan.

In order to make a large diesel engine work much more efficiently, it is necessary to improve lubrication in two types of engines, two-stroke engine and four-stroke engine.

It is therefore an object of the present invention to provide a method of lubricating a large diesel engine that increases the efficiency and economics of the engine without compromising operational stability. It is also an object of the present invention to provide a corresponding large diesel engine.

The object of the present invention which satisfies the above object in the process engineering and apparatus aspects is characterized by being defined by the characterizing part of the independent claims of each category.

According to the present invention, there is provided a cylinder block comprising: at least one cylinder disposed in a cylinder block; and a piston reciprocable along a running surface in the cylinder, the piston defining a boundary of the combustion space and a crankshaft In which a lubricant flowing into a cylinder from a lubricant source is contaminated by a combustion process occurring in the combustion space in order to lubricate the piston, characterized in that the contaminated lubricant is discharged from the cylinder And then guided to a purifier for purifying the lubricant before entering the crank housing.

In the lubrication of a large two stroke diesel engine, the measurement of the dirty lubricant being discharged from the cylinder and cleansed before the lubricant enters the crank housing, indicates that the lubricating oil discharged from the combustion process is no longer considered waste Rather, it results in reuse by purification. This is a great advantage in terms of economy. In the lubrication of a large four stroke diesel engine, the method of the present invention results in a very contaminated lubricant being discharged from the cylinder before being mixed with a relatively clean lubricant at the bottom of the crank housing. However, for clarification, it is much more efficient for the contaminated lubricant to be more intensively purified than the contaminated lubricant first mixed with clean lubricant and then purified. Therefore, even for a four-stroke engine, a significant performance improvement to lubrication is achieved.

Preferably, the contaminated lubricant may be withdrawn at one location located between the lower dead center point of the final piston ring and the boundary between the cylinder block and the crank housing. The final piston ring means the piston ring furthest away from the combustion space. This final piston ring may also be comprised of an oil scraper ring. That is, this means ensures that as much lubricant as possible is collected from the combustion space or the running surface to effectively combine with the oil contained in the crank housing.

Particularly, it is particularly preferred in the design of a two-stroke engine that the contaminated lubricant is discharged directly above the stuffing box, in particular above the stuffing box, which is installed between the cylinder block and the crank housing.

A preferred measurement is directed to the lubricant source so that the cleaned lubricant is processed in the lubricant circuit. In particular, for a two-stroke engine, the lubricant used for piston lubrication and / or cylinder lubrication can be fed back to the lubricant source, or to other locations in the lubricant circuit after purge, rather than a consumable product that should no longer be discarded after use. It is possible to reduce the lubrication condition of the engine drastically, for example, by 300% or more by recirculating the lubricant from the inner cylinder space. At the same time, the lubricating rate and / or the amount of lubricant applied to the running surface or piston per unit time can be increased, resulting in much better lubrication. The overall lubrication condition is significantly reduced by the feedback of the cleaned lubricant, albeit the lubrication rate is increased, which is also very beneficial in economic terms.

Particularly for a four-stroke engine, the purification of highly contaminated lubricants reduces the consumption of the total amount of lubricant, the replacement period and / or the filling cycle of the lubricant can be significantly extended and the amount of lubricant as waste is reduced.

Particularly preferably, for a two-stroke engine, by means of the method according to the invention, only one lubricant may be provided for piston lubrication, or at least for lubrication of the journal or bearing, and / or cooling of the piston have. Thus, the lubrication known from the prior art with two separate lubricant systems is no longer needed, which can also reduce effort and / or cost for device installation.

A preferred measurement is made to observe the viscosity and / or alkalinity (base number value, BN value) of the lubricant. Therefore, it is possible to recognize when these values exceed or fall below the allowable boundary. In this case, appropriate measurements can be made.

Preferably, during operation, a new lubricant is supplied to the lubricant circuit. On the one hand, a lubricant lost by combustion or leakage can be replaced by the supply of a new lubricant, and on the other hand, certain intrinsic properties of the lubricant, such as viscosity and BN value, can be set to appropriate values.

In this regard, it is a desirable measure to supply lubricant circuitry to cool the piston first before introducing fresh lubricant into the cylinder. That is, the new lubricant can thus flow into the lubricant circuit as efficiently as possible.

Preferably, the additive may be supplied to the lubricant. For example, the BN value or chemical properties of the lubricant can be systematically and controllably altered by the addition of pure additives.

In order to particularly efficiently collect and / or remove the lubricant adhered on the running surface, it may be preferable that the lubricant is removed from the running surface of the cylinder by the oil scraper ring provided on the piston.

According to the present invention, there is also provided a cylinder head comprising: at least one cylinder provided in a cylinder block; a piston reciprocable along the running surface in the cylinder; and a lubricating inlet for introducing the lubricant from the lubricant source into the cylinder, Wherein the piston forms a boundary of a combustion space and is connected to a crankshaft provided in the crank housing and the lubricant is contaminated by a combustion process occurring in the combustion space, Wherein an outlet is formed for the lubricant and the outlet is arranged and configured so that the contaminated lubricant can be discharged from the cylinder before entering the crank housing and wherein a purifier is provided for the contaminated lubricant Characterized in that the purifier is connected to the outlet .

The above description of the method according to the invention may equally be applied to a large diesel engine according to the invention, which may consist of a two-stroke engine and a four-stroke engine.

For reasons already described, the purifier is connected to a lubricant source to form a lubricant circuit.

The outlet for the contaminated lubricant can preferably be disposed at a point located between the bottom dead center of the final piston ring and the boundary between the cylinder block and the crank housing.

For large diesel engines, particularly two-stroke engines, according to the present invention, the outlet for contaminated lubricant can also be advantageously arranged in a stuffing box provided between the cylinder block and the crank housing.

Particularly, for a large four-stroke diesel engine, it is preferred that a collecting device for the lubricant, such as a collecting channel or groove, is formed at the lower end of the cylinder.

Other preferred measures and preferred embodiments of the invention may be defined from the dependent claims.

Hereinafter, the present invention will be described in detail in terms of apparatus and process engineering, with reference to examples and accompanying drawings. Embodiments of the present invention are shown in partial cross-sectional views, and in schematic diagrams that are not drawn to scale.

1 is a first embodiment of a large diesel engine according to the present invention, which is composed of a two-stroke engine.
2 is a second embodiment of a large diesel engine according to the present invention, which is composed of a four-stroke engine.
3 is an embodiment of a lubricant collecting apparatus.
Figure 4 is another embodiment of a collection device.

1 shows a first embodiment of a large diesel engine according to the invention, generally indicated by reference numeral 1, in which a method of lubrication according to the invention is carried out.

The large-size diesel engine 1 is constituted by a low-speed two-stroke large crosshead diesel engine which is wired in the longitudinal direction.

The large diesel engine 1 usually includes a plurality of cylinders 2, and only one cylinder can be seen in Fig. A cylinder (2) is disposed in a cylinder block (3) located above the crank housing (4). Is arranged to be reciprocatable in the cylinder (2) such that the piston (5) moves along the running surface (21) of the inner wall of the cylinder (2) in the operating state. Generally, the running surface 21 is formed by a cylinder inset or a liner. According to the drawing, a combustion space 6 in which a combustion process occurs is formed at the upper end of the piston 5, and although not shown in FIG. 1, the piston usually includes a plurality of piston rings. The piston 5 is connected to a crosshead 8 via a piston rod 7 which is then connected to a crankshaft 10 disposed in the crank housing 4 via a rod 9 .

In order to pass the piston rod through the cylinder block 3 into the crank housing 4, a stuffing box 34 surrounding the piston rod is provided in a known manner.

During operation of the large diesel engine, lubricant is applied to the running surface 21 in a known manner to achieve good running characteristics of the pistons and to minimize wear of the cylinder walls, the piston 5 and the piston rings, (5), the piston ring and the running surface. In addition, the lubricating oil can neutralize the corrosive combustion products and prevent corrosion, such as sulfide corrosion. Lubricating oil can be applied on the running surface 21 through the walls of the cylinder 2 and / or the interior of the piston 5. All known lubrication methods are suitable for this purpose, such as pulsed lubrication or accumulated lubrication (optional lubrication). All known means, such as lubricating oils, typically used in large diesel engines, are suitable as lubricants.

The lubricant is highly contaminated by the combustion process and mechanical wear of the combustion space 6, such as combustion residues, wear particles, wear particles or compounds.

The lubricant is removed from the running surface 21 by the piston 5 and / or the piston ring so that the lubricant is discharged from the cylinder block 3 in the vicinity of the stuffing box 34 Is collected at the bottom. Typically, a lower portion thereof is provided with a chamfer 35 through which the lubricant can flow out through the outlet 36. According to the prior art, highly contaminated lubricants are treated because they can no longer be used for further use.

According to the present invention, the contaminated lubricant is discharged from the cylinder 2 before entering the crank housing, and is proposed to enter the purifier 60, as indicated by the arrow 40, to purify.

Surprisingly, it has been shown that the highly contaminated lubricant discharged from the combustion space is completely purified and can be used for further use. This is a very important advantage from an economical point of view.

Preferably, the cleaned lubricant is fed back to the lubricant source 62 from which lubricant was initially discharged, as indicated by the arrow 41. The lubricant 62 is connected to an oil pan 66 provided at the lower portion of the crank housing 4 through a connecting line (arrow 45) so that the lubricant collected in the oil pan is discharged to the oil pan 66 to the lubricant source 62. The lubricant is discharged from the lubricant source 62 and applied on the running surface 21 of the cylinder for lubrication of the piston 5 as indicated by the arrow 42 in Figure 1 and then, Which is removed from the running surface 21 as the piston 5 moves downward and arrives at the purifier 60 through the outlet 36 to be purified and then fed back to the lubricant source 62, Is obtained. The lubricant discharged by the lubrication of the crank housing (e.g., by crosshead lubrication or journal lubrication) is collected in the oil pan 66 and can reach the lubricant source 62 via a connecting line (arrow 45) have.

Thus, with the two-stroke embodiment of the large diesel engine according to the present invention, the contaminated lubricant generated on the running surface 21 is no longer treated as waste but rather reintroduced into the lubricant circuit in a purified form. This regeneration measurement can save a considerable amount of lubricant. Even if the amount of lubricant applied to the running surface 21 per unit time or stroke per unit time is increased compared to a known large two-stroke diesel engine, lubricant for cylinder lubrication, even for increased lubrication, Consumption rate can be reduced by more than 300%.

A buffer store 61 is provided between the outlet 36 of the cylinder 2 and the purifier 60 to temporarily store the contaminated lubricant.

Also provided is a lubricant reservoir 63 which is capable of introducing a new lubricant into the lubricant circuit (arrow 43) and into the additional reservoir 64. In this additional reservoir, for example, an additive for a lubricant may be stored, which may, if necessary, be replaced by an additive such as, for example, the arrow 44 ), As shown in Fig.

Optionally, a monitoring unit 65 may also be provided in the lubricant circuit to observe, control, or analyze the characteristics and / or configuration of the lubricant. For example, the viscosity, chemical composition, temperature, etc. of the lubricant can be analyzed by the monitoring unit. The monitoring unit can, for example, adjust the supply of fresh lubricants, additives or other elements according to the measurement results or the input signal.

It is also possible to use only one lubricant to lubricate the pistons and journals, and optionally to cool the pistons in large two-stroke diesel engines, in accordance with the above method of discharging and purifying the lubricant from the running surface. There is no longer a need for the use of two typical lubricant systems at present, namely a lubrication system with a system lubricant and a lubrication system with an independent cylinder lubricant. Fig. 1 shows an embodiment of such a large two-stroke diesel engine in which a large diesel engine 1 is equipped with a conventional two-stroke diesel engine, which includes a lubricant circuit for supplying the same lubricant to all positions requiring lubrication in the large- A single lubrication system is provided. In the drawings not excluded, for example, a piston 5 with a running surface 21 and a piston ring, a main bearing of a crankshaft 10, a bearing of a push rod 9, crossheaded journals, There are slide-ways and / or sliding shoes of the crosshead 8 and a piston rod journal. The lubricant may also be used in a known manner to cool the piston. To this end, the lubricant flows into the interior of the piston 5 as cooling oil, and flows back to the lubricant source 62, optionally through the oil pan 66, inside the piston.

In a large two-stroke diesel engine, only one lubricant is used, which compromises the viscosity and BN values. For piston lubrication and / or cylinder lubrication, the main prerequisite for the lubricant is the ability to neutralize and purify the corrosive combustion products (purification power), while for other systems applications, the lubricant is exposed to the high pressure and its separation capability ), I.e., the separability of the lubricant from water, for example.

In general, the viscosity of the lubricant is indicated by the SAE (SAE) number. In using only one lubricant in the large diesel engine 1, for example, lubricants having SAE 40 and BN 40 may be used, or other typical lubricants for a four-stroke engine may be used.

However, in this embodiment of the method according to the invention or in the case of a large diesel engine according to the invention, especially in the case of a two-stroke engine, two separate lubricant systems, one for cylinder lubrication and / or piston lubrication, A system for system lubrication (e.g., journal lubrication and optionally piston cooling) may be provided. According to this embodiment, preferably, the cylinder lubrication system is such that the lubricant contaminated by the combustion process is removed from the running surface 21 of the cylinder 2, discharged from the cylinder 2, and then supplied again to the lubricant source, The lubricant may be re-applied to the running surface 21 from the lubricant source, for piston lubrication and cylinder lubrication.

Preferably, the purifier 60 may include a centrifuge for purifying the lubricant. In particular, non-soluble liquid elements such as particles or water can be separated by a centrifuge. In order to ensure that the contaminated lubricant is first purged by a mechanical filter, it may be desirable to connect a plurality of mechanical filters whose surface is coarse or different in fineness before the centrifuge.

On the other hand, in addition to the centrifugal separator, a chemical purifying device for the lubricant can be provided to selectively remove the material from the lubricant generated by the neutralization of the caustic combustion product. For example, the calcium present in the new lubricating oil can be removed again after combining with sulfate ions that appear during combustion during formation of calcium sulfate, for example, during purification by precipitation reaction and continuous filtration.

In the embodiment shown in Fig. 1, a new lubricant may be supplied to the lubricant circuit, in particular from the lubricant storage portion 63. Fig. In this way, on the other hand, the lubricant loss can be restored by a process such as leakage, combustion, and the like. On the other hand, by introducing a new lubricant, the properties of the lubricant, such as the BN value of the lubricant, can be controllably changed.

Providing a new lubricant to the lubricant circuit is generally possible at any location in the circuit, thus exhibiting high flexibility. It may therefore be desirable, in particular, to introduce a new lubricant into the lubricant circuit and to cool the piston before the lubricant is applied to the running surface 21 of the cylinder. In this case, the new lubricant is supplied to the line from the lubricant source 62 to the oil cooling line provided inside the piston 5, so that an ideal cooling operation can be performed by the new lubricant.

In addition, one or more additives may be introduced from the reservoir 64 into any position of the lubricant circuit. This is particularly preferable when the additive is introduced into the lubricant circuit so that the additive and the lubricant are combined just before the lubricant is applied to the running surface 21 of the cylinder 2. [

Depending on the application, there may be many other suitable or desirable locations from which fresh lubricant from the lubricant reservoir 63 or additives from the reservoir 64 may be introduced into the lubricant circuit.

An oil scraper ring may be provided on the piston 5 in addition to the piston ring in order to increase the lubricating efficiency of the lubricant removed from the running surface 21 and to increase the regeneration amount of the lubricant, It is preferably formed by a scraping ring. The "final" piston ring of the piston 5 means the piston ring which is farthest from the combustion space 6. Further, since all of the contaminated oil is actually removed from the running surface 21, it is ensured by the oil scrapering that the oil film or the lubricating film can be regenerated very quickly on the running surface.

The lubricant consumption rate of the large diesel engine 1 can be drastically reduced by all means such as increasing the recirculation or removal rate of the lubricant from the running surface 21. [ Therefore, for example, it is possible to reduce the lubricant consumption rate or the lubricant consumption rate to a value of 0.2 g / kWh to 0.6 g / kWh in the large two-stroke diesel engine 1 introduced in the longitudinal direction according to Fig. At the same time, the lubricating speed can be increased.

Of course, it is also possible to discharge contaminated lubricant from the cylinder 2 at a different position from the stuffing box 34. [ In order to ensure the collection of the contaminated lubricant as efficiently as possible, it is preferable to discharge the contaminated lubricant at a position below the bottom dead center of the final piston ring and / or below the oil scraper ring if necessary Do.

Also, one or more outlets 36 for the lubricant may be provided, i.e., the contaminated lubricant may be discharged at two or more different locations of the cylinder 2.

Alternatively or additionally, an outlet for the lubricant may be provided at the lower end of the stuffing box 34 or the stuffing box 34 according to the drawings. In this case, the lubricant attached to the piston rod 7 can also be collected.

Further, the lubricant coming from the purifier 60 may not be supplied directly or entirely to the lubricant source 62, but rather may be introduced into one or more various locations of the lubricant circuit.

Fig. 2 shows a schematic diagram of a second embodiment of a large diesel engine 1 according to the invention, in which the method according to the invention is carried out and consists of a large four-stroke diesel engine 1. The same reference numerals as those in Fig. 1 are used for parts having the same or similar functions.

1 and all the descriptions provided for the first embodiment apply to the second embodiment in a similar or equivalent sense.

2, the piston 5 is directly connected to the crankshaft 10 by a connecting rod 9 '. 2, the piston 5 is shown with a plurality of piston rings 51, of which the piston ring, the piston ring furthest away from the combustion space 6, consists of an oil scraper ring 52.

In the figure, at least one intake valve 68 and an exhaust valve 69 are provided at the upper end of the combustion space 6.

In the region of the cylinder 2, the cylinder block 3 is opened toward the crank housing 4 due to the configuration of the connecting rod 9 ', that is, there is no stuffing box for the two-stroke engine here. The oil pan constituted by the lubricant supply source (62) is located under the crank housing (4).

During operation, as the piston 5 moves downward, the lubricant is removed from the running surface 21 of the cylinder 2 and / or the cylinder liner.

In the prior art, the highly contaminated lubricant by the combustion process falls into the crank housing 4 at the lower boundary of the cylinder 2 and is mixed with the remainder of the lubricant in the lubricant source 62. The contaminated lubricant is strongly diluted in the lubricant source 62 because the amount of contaminated lubricant removed from the running surface 21 is negligibly small compared to the total amount of lubricant.

According to the present invention, the highly contaminated lubricant removed from the running surface 21 falls into the crank housing 4 because the contaminated lubricant is discharged from the cylinder before entering the crank housing 44, So that it is prevented.

For this purpose, since the collecting device 22 is installed at the lower end of the cylinder 2 of the large four-stroke diesel engine 1 and collects the contaminated lubricant removed from the running surface 21, It can not enter into the crank housing 4, so that it does not enter into the lubricant source 62. [

Figures 3 and 4 illustrate two embodiments of the collecting device 22.

3, grooves 221 are formed along the entire circumference at the lower end of the cylinder 2 or at the lower end of the cylinder liner according to the present drawing. In the groove bottom, At least one discharge opening 222 is formed which can be inserted into the discharge opening 36.

In another embodiment of the collecting device 22 shown in Fig. 4, a groove 223 extending along the entire circumference at the lower end of the cylinder 2 or near the lower end of the cylinder liner is formed. The lubricant removed from the running surface 21 is collected in the groove. The contaminated lubricant flows from the groove 223 into the outlet 36 through a discharge opening not shown in FIG. 4, the groove 223 is inclined downward toward the outer wall of the cylinder 2 so that the collection of the lubricant can be performed more easily.

In addition, the above embodiments are applicable to two separate lubricant circuits, one for the cylinder lubrication and / or for the piston lubricating lubricant circuit, and the other for the journal lubricating lubricant circuit and, optionally, Diesel engines are feasible.

Variations in the embodiment of FIG. 2 where the contaminated lubricant is discharged at one or a plurality of different positions of the cylinder 2 may, of course, be possible. Preferably, the contaminated lubricant has a lower dead center point of the final piston ring or oil scraper ring 52 and one or a plurality of < RTI ID = 0.0 > Position. Basically, only a significant amount of contaminated lubricating oil is prevented from entering directly into the lubricant source through the crank housing 4 from the running surface 21.

The contaminated lubricant is not diluted and can be purified more efficiently and efficiently in the purifier 60 because the highly contaminated lubricant can be discharged out of the cylinder 2 without being mixed with the lubricant in the lubricant source 62 have.

Claims (15)

A method of lubrication of a large diesel engine comprising at least one cylinder (2) provided in a cylinder block (3) and a piston (5) reciprocable along a running surface (21) in the cylinder (2)
The piston 5 forms the boundary of the combustion space 6 and is connected to a crankshaft 10 provided in the crank housing 4,
A lubricant flows from the lubricant source 62 into the cylinder 2 for lubricating the piston 5 and the lubricant is contaminated by the combustion process occurring in the combustion space 6,
The contaminated lubricant is discharged from the cylinder 2 and then guided to a purifier 60 for purifying the lubricant before entering the crank housing 4,
Only one lubricant is used so that a lubricant circuit supplies the same lubricant to all of the locations where lubrication is required in the large diesel engine and all these positions include at least the main bearing of the crankshaft 10,
Lubrication method of large diesel engine. The method according to claim 1,
Wherein the contaminated lubricant is discharged at a point located between a lower dead center position of the final piston ring and a boundary between the cylinder block (3) and the crank housing (4). 3. The method according to claim 1 or 2,
Wherein the contaminated lubricant is discharged from a stuffing box provided between the cylinder block (3) and the crank housing (4). 3. The method according to claim 1 or 2,
Wherein the purified lubricant is directed to the lubricant source (62) so as to be processed in a lubricant circuit. 3. The method according to claim 1 or 2,
Wherein the lubricant is used for lubrication of the piston (5) and is also used for at least one of lubrication of bearings or journals and cooling of the piston (5). 3. The method according to claim 1 or 2,
And observing at least one of a viscosity of the lubricant and a BN value (alkali value) of the lubricant. 5. The method of claim 4,
Wherein a new lubricant is supplied to the lubricant circuit. 8. The method of claim 7,
Wherein the new lubricant is fed to the lubricant circuit to cool the piston (5) before it is introduced into the cylinder (2). 3. The method according to claim 1 or 2,
Wherein an additive is fed to the lubricant. 3. The method according to claim 1 or 2,
Wherein the lubricant is removed from the running surface (21) of the cylinder (2) by an oil scraper ring (52) installed on the piston (5). A piston 5 capable of reciprocating along a running surface 21 in the cylinder 2 and a lubricant source 5 for lubrication of the piston 5, And a lubricating inlet (42) for supplying a lubricant to the cylinder (2)
The piston 5 forms the boundary of the combustion space 6 and is connected to a crankshaft 10 provided in the crank housing 4,
The lubricant is contaminated by the combustion process occurring in the combustion space 6,
An outlet 36 is formed for the contaminated lubricant and the outlet is arranged and configured so that the contaminated lubricant can be discharged from the cylinder 2 before entering the crank housing 4, , A purifier (60) is provided for the contaminated lubricant, the purifier (60) is connected to the outlet (36)
Only one lubricant is used so that a lubricant circuit supplies the same lubricant to all of the locations where lubrication is required in the large diesel engine and all these positions include at least the main bearing of the crankshaft 10,
Large diesel engine. 12. The method of claim 11,
And the purifier (60) is connected to the lubricant source (62). 13. The method according to claim 11 or 12,
Wherein the outlet (36) for the contaminated lubricant is disposed at a point located between a bottom dead center of the final piston ring and a boundary between the cylinder block (3) and the crank housing (4). 13. The method according to claim 11 or 12,
Wherein the outlet 36 for the contaminated lubricant is disposed in a stuffing box 34 provided between the cylinder block 3 and the crank housing 4. [ 13. The method according to claim 11 or 12,
And a collecting device (22) for the lubricant is formed at the lower end of the cylinder (2).

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