KR20140051413A

KR20140051413A - Device for scraping off a rod and reciprocating piston engine provided with such a device

Info

Publication number: KR20140051413A
Application number: KR1020147006592A
Authority: KR
Inventors: 에릭 크로네
Original assignee: 맨 디젤 앤드 터보 필리얼 아프 맨 디젤 앤드 터보 에스이 티스크랜드
Priority date: 2011-08-30
Filing date: 2012-08-24
Publication date: 2014-04-30
Also published as: KR101546019B1; JP6032658B2; DK201100649A; DK177690B1; WO2013029611A1; CN103814244A; JP2014529713A; WO2013029611A8; CN103814244B

Abstract

An apparatus for scrubbing a circumferential surface of a fluid wetted rod, the apparatus being sized for a rod, the rod being movable in an axial direction, the apparatus comprising at least two scraper flakes (23a, These scraper flakes are axially spaced apart from each other and radially changeable and are also received in a common holder ring 21 which is provided with respective flakes 23a and 23b And the holder ring is likewise able to radially vary and, therefore, due to the spring arrangement associated with the radially outer surface of the holder ring, the radially inner open annular groove for the region surrounded by the holder ring Spring biased adaptation becomes possible in the radial direction, and due to the spring device associated with the radially outer surface of the holder ring, And the optimal spraying effect of all of the scraper foil pieces 23a and 23b of the common holder ring 21 is such that at least the rear foil piece 23a, when viewed in the direction of motion of the rod 11, By the resiliently radial support of the groove bottom of the annular groove of the annular groove.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for scraping a load, and a reciprocating piston engine in which such a device is provided.

The present invention relates to a device for scraping the circumferential surface of a fluid wet rod, the device being adapted to the rod, the rod comprising at least two scraper lamellae having the same shape The scraper foil pieces being axially spaced apart from one another and being respectively divided so as to allow for individual radial variations and also radially projected and received in a common holder ring , The holder ring being provided with respective radially inwardly open annular grooves for each of the flakes and the holder ring being likewise radially variable due to the split design so that the radially outer surface of the holder ring And the spring ring is moved in the direction of the spring ring The perfume adaptation becomes possible in the radial direction.

The invention also relates to a crosshead reciprocating piston engine provided with such an apparatus and in particular in the form of a large two-stroke uniflow internal combustion engine.

In this kind of known construction, the scraped flakes are rigidly supported radially in the relevant groove bottom, so that the flakes have the same fixed inner diameter interacting with the rod. The fluid film in the gap between the rod and the scraper foil scratching this rod produces a hydrodynamic bearing force which is in equilibrium with the spring force acting on the holder ring. Therefore, the radial position of the holder ring and the size of the clearance between the rod and its flake may also be determined by the leading scraper flakes in a set of scraper flakes, substantially the axial direction of the rod, The first scraper flake interacting with a given load area for the first scraper flake). The thickness of the fluid film is reduced to half by the acting scraper flakes. This makes it uncertain whether the next flake will effectively reach the fluid film for further scraping. As a result of the negative result, the fluid is scratched off poorly and a relatively thick fluid film remains on the rod. If the scraping rod is a piston rod of a crosshead motor (the cylinder lube oil contaminated by the combustion residue comes into contact with the piston rod in the region above the crankcase), as a result of the above, This system oil, which can send a lot of cylinder lubricant and combustion residues from the top to the crankcase, thereby polluting the system oil contained in the crankcase and thus being sufficiently clean for bearing lubrication and hydraulic, requires frequent filtration .

Document GB 1 265 967 discloses an oil scraper ring for a stuffing bore for a rod or shaft with a scraping ring element with two scraping edges.

Document US 3 522 949 discloses an annular sealing means having a split sealing ring and a split spacer element which are joined to each other in one of a pair of coaxial members which are relatively movable and have a generally circular cross section And is located in the annular groove to form a seal.

It is an object of the present invention, which has been made in view of this point, that each scraper flake of the common holder ring has an optimal scraping effect.

According to the present invention, this object is achieved by at least a rear flake or at least one head flake, viewed in the direction of movement of the rod, being elastically radially supported against the groove bottom of the annular groove of the flake.

With this measure, disadvantages of known configurations can be avoided. Due to the elastic support, each flake can be individually radially varied, so that the flakes will be controlled by a force acting in the radial direction. This is particularly advantageous in comparison with the known embodiment in which the two flakes are commonly resiliently supported since the force acting on one flake will not affect the other flakes in the configuration of the present invention. Depending on the resilience of the support to the groove bottom, each flake is somewhat backward into the flutes of the flake, so that the next flake that is not backward can be effective. Since the film thickness is reduced to half by each effective flake, the present invention greatly reduces the film thickness, so that in relation to the crosshead car, the upper cylinder oil and the lower system oil are strongly separated, The need for filtration of the system oil is minimized. Another advantage of the present invention is that the chemical contamination of the sensitive system oil due to the chemically aggressive fluid often coming down from the cylinder environment is reduced, thus reducing the need for system oil exchange and thus, for example, bearing aggressive chemical contaminants being filtered off I can not. Another advantage of the present invention is that simple wear compensation is possible due to the flexible support of the flakes.

Hereinafter, other advantageous improvements and preferred embodiments of the overlapping idea are mentioned.

Advantageously, each flake of the holder ring is elastically supported in the radial direction. Thus, in the case of a reciprocating rod, the rod can be scraped back and forth or up and down during each stroke with the same effect.

Advantageously, the resilient support of the flake in the associated annular groove may preferably consist of a flexible padding insert having a profile such as the so-called O-ring. Thus, a very simple embodiment is obtained inexpensively. Also, there is a simple possibility for refrofit. Of course, the separate flexible padding inserts in the grooves may have other suitable cross-sectional profiles / shapes and may even be hollow, so that, preferably in combination with a suitably selected polymeric material having elasticity, It becomes possible to perform compression so as to move slightly in the radial direction.

According to another advantageous measure for resiliently supporting the flake in the associated annular groove, the flake has at its radially outer surface a flame having a properly compressible structure or profile, or having a radially outward side An elastic material layer can be provided which allows the elastic material layer to move further. Such a layer can be preferably integrally formed with the relevant flake, for example, by any vulcanization treatment, thereby reducing the number of parts and simplifying the bonding. Preferably, the groove bottom space is not completely filled with material. More preferably, the material is porous in the groove space. According to one embodiment, the square cross-section of elastomer does not completely fill the allowed groove space.

In practice, the holder ring may comprise two scraper flakes. This will cause the holder ring to be statically supported on the rod by the two flakes, resulting in balanced wear.

As another practical measure, the holder ring may be provided with at least one outlet opening in the region between the two scraper flakes. This ensures that the fluid that has been scraped off and collected is reliably discharged, so that pressure is not formed in the space between the flakes.

Additionally or alternatively, the holder ring may be provided with at least one respective discharge groove on at least one (axial) front side and / or one lateral side, preferably both front side and / or both lateral sides , So that fluid exiting from the front of the back flake (i. E., In the fluid unobstructed passage between the load surface and the foil that first scrape a given load region in the direction substantially in the axial direction of the load motion) is reliably ejected. Thus, the work of the associated flakes can be simplified. (Axial direction) front side may be the same as the outer side.

In practice, each outlet and / or outlet groove may communicate with a discharge line, which may be connected to an annular ring groove provided in an annular housing for receiving an associated holder ring.

According to another preferred embodiment, the holder ring and flake can be circumferentially divided into a set of pieces, so that even if the rod is held in its position in the associated machine, do.

In fact, at least both ends of the segment of the holder ring may be provided with overlapping tongues so that the overlapping areas of the tongue are advantageously sealed from the outside by the cover element disposed on the radially outer surface of the holder ring . With these measures, leakage of scraped and removed fluid can be avoided.

A radially inwardly directed force is biased toward the smaller diameter by the spring to bring the scraper foil into contact with the rod. To accommodate the annular spring, advantageously, the holder ring may also be provided with a radially outwardly open annular groove.

As another practical measure, at least one element of the apparatus is provided with at least one tag, preferably an RFID-type tag, which contains storage data to reliably identify the element or apparatus. Thus, the operation of combining and / or servicing the device according to the present invention can be simplified.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 is a vertical cross-sectional view of a crosshead type heavy duty diesel engine.
Figure 2 shows an enlarged view of the lower region of the scavenging chamber of the arrangement according to Figure 1;
Figure 3 shows a scraping device of the current design with two scraper flakes having the same fixed inner diameter.
4 shows a scraping device according to the present invention.
5 shows a top view of the split holder ring.
Figure 6 shows a side view of the holder ring according to Figure 5;
Fig. 7 shows an example in which the split type holder ring is sealed from the outside.

The diesel engine shown in Fig. 1 can be used to drive an offshore object or a large power plant. Such an internal combustion engine is used, for example, in a limited reciprocating piston engine of the crosshead type. Since the basic structure and operation manner of such a reciprocating engine are known, the following description will be made only when necessary for understanding the present invention.

The engine shown in Fig. 1 includes a crankcase 1 in its lower part, in which the crankshaft 2 is supported by a so-called main bearing. A row of cylinders 3 is arranged above the crankcase 1. Each of the cylinders 3 includes a cylinder liner 4 in which a vertically movable piston 5 is disposed. The piston (5) functions as a lower movable boundary of the combustion chamber (6) inside the liner (4). The cylinder liner 4 is supported in a peripheral housing of a scavenging chamber 7 which can be filled with scavenge air or gas.

The liner (4) enters into the scavenging chamber (7) with its lower part and ends at an interval above the chamber bottom (8). An inlet port 9 is provided in the region of the lower end of the liner 4. As the piston 5 moves up and down, it passes through the inlet port 9, so that the communication between the scavenging chamber 7 and the combustion chamber 6 is opened and cut off.

The piston 5 is connected to the associated crosshead 10 by a piston rod 11 disposed along the axis of the cylinder liner 4 and the piston 5. The crosshead 10 is designed in the form of a sledge which is located inside the crankcase 1 and moves up and down while being guided by the associated guide 12 in parallel with the axis of the piston 5 and the piston rod 11 have. The crosshead (10) includes a crosshead pin (13) fixed to the piston rod (11). A connecting rod 14 is supported on the pin 13, which connects the crosshead 10 with the crankshaft 2. The scavenging chamber bottom (8) lies on the ceiling of the crankcase (1). The piston rod 11 is passed through the scavenging chamber bottom 8 and the wall formed by the crankcase ceiling so that the piston rod 11 penetrates the associated seal packing 15 provided in the scavenging chamber bottom 8 .

The cylinder liner is supplied with a suitable lubricating oil (referred to as cylinder oil in the present application), which can be dripped down to the furnace chamber bottom 8, which is not combusted with the combustion residues. An outlet 16 is provided for communicating with the bottom area of the scavenging chamber 7 to treat this fluid dripping down. The chamber bottom 8 may be inclined towards the outlet 16 and / or a ring channel may be provided which surrounds the seal packing 15 and communicates with the outlet 16. [ When the inlet port 9 is opened during the downward stroke of the piston 5, exhaust gas containing other combustion residues can also enter the scavenging chamber 7. [

In the crankcase 1 there is a high cleanliness oil (referred to as system oil in the present application), which is used for lubricating and hydraulic purposes of the bearing. To filter the oil, a filtration unit (not shown) is provided. In order to prevent contamination of the system oil by the cylinder oil, the crankcase 1 must be separated from the scavenging chamber 7. To this end, a seal packing 15 is provided which can be designed as a stuffing box.

As best seen in FIG. 2, the stuffing box has an annular housing 17. The housing 17 is disposed in a peripheral socket 18 of the scavenging chamber bottom 8, which defines an opening through which the piston rod 11 passes. The housing 17 is provided with radially inwardly open annular grooves. Associated rings are disposed in each of these grooves. These rings are partly designed with a scraper ring (19) and partly with a sealing ring (20). In practice, the scraper ring 19 may be disposed above the sealing ring 20.

The purpose of the sealing ring 20 is to overcome the difference between the pressure in the scavenging box 8 (about 5 bar) and the pressure in the crankcase 1 (about 1 bar) The purpose is to reduce the oil film on the outer surface of the piston rod 11. In this connection, it should be considered that above the sealing packing 15, the piston rod 11 comes into contact with the cylinder oil on its outer surface in the form of a rather thick oil film.

3 and 4, each of the scraper rings 19 has a holder ring 21 disposed in an associated annular groove 22 of the housing 17 and a plurality of annular grooves 22 arranged in the associated annular groove of the holder ring 21 And includes a set of two or more uniform scraper flakes 23a, 23b. In the present embodiment, two pieces of scraper foil 23a, 23b are provided for each holder ring 21. So that any one of the scraper flakes 23a and 23b will function as the first flake or the last flake with respect to the direction D of reciprocating piston rod 11. Of course, a set of three or more flakes can also be provided in a common holder ring. The similarly formed scraper foils 23a and 23b are axially spaced apart and project radially beyond the radially inner surface of the associated holder ring 21, resulting in a scraper edge.

The holder ring 21 and the scraper foil pieces 23a and 23b can be changed in the radial direction and the holder ring 21 contacts the peripheral ring springs 24 so that the scraper foil pieces 23a and 23b contact the piston rod 11. [ Lt; RTI ID = 0.0 > smaller diameter. &Lt; / RTI > The ring-shaped spring 24 is disposed in the outer open annular groove 25 of the holder ring 21. The thickness of the osmosis membrane 26 on the outer surface of the piston rod 11 must be reduced by the scraper flakes 23a and 23b.

In the known configuration according to Fig. 3, the scraper flakes 23a, 23b are arranged radially in the associated grooves of the holder ring 21 in a radial direction. The first scraper foil 23a (i.e., the flake on the back side in the direction of motion D of the piston rod 11) scrapes off the layer of cylinder oil so that the thickness of the oil film 26 is d1 and d2 As shown in FIG. A hydrodynamic pressure which is in equilibrium with the inward spring force of the ring spring 24 is generated in the clearance between the scraping flake 23a and the outer surface of the piston rod 11. [ Therefore, the radial position of the holder ring 21 and the radial position of each different flake (here, the second scraper foil piece 23b) are determined by the radial position of the first scraper foil piece 23a. Since the scraper foil pieces 23a and 23b have the same shape and thus have the same diameter and the oil film thickness is reduced to half by the first scraper foil piece 23a, the next flake (here, the second scraper foil piece 23b) Away from the surface of the membrane and thus have no scraping effect.

This negative result is overcome by arranging at least the first scraper foil piece 23a in the radial direction in the annular groove of the holder ring 21 in accordance with the present invention, as shown in Fig. In the embodiment shown, both scraper foil pieces 23a and 23b are formed by a flexible element 27 positioned between the bottom of the associated groove of the holder ring 21 and the radially outer surface of the foil 23a and 23b And is elastically disposed in the groove. Due to the flexible element 27, the associated flake 23a, 23b can be radially adjusted by a force acting in the radial direction. Therefore, each of the scraper foil pieces 23a and 23b can reach the oil film 26, so that the oil film 26 is separated by each of the foil pieces 23a and 23b as indicated by d1, d2 and d3 in Fig. The thickness of the first electrode 26 is reduced to approximately half. As a result of this positive result, the thickness of the oil film 26 is greatly reduced, so that the amount of the cylinder oil fed into the crankcase 1 from above to below the seal packing 15 by the piston rod 11 is relatively small Significantly reduced. Therefore, the cost of the system of the crankcase 1 is also significantly reduced by the cylinder oil.

The flexible padding can be placed behind the associated scraper flakes 23a, 23b in the associated annular groove of the holder ring 21, in order to form the flexible element 27 mentioned above. The flexible padding may have a flexible cross-sectional design and / or may be made of a flexible material. In practice, so-called O-rings, known for many purposes, can be inserted. Of course, the separate flexible padding inserts in the grooves may also have other suitable cross-sectional profiles / shapes, or even hollow shapes, which allow the lamellae to be compressed somewhat in the radial direction with suitably selected polymeric material, Lt; / RTI > Alternatively or additionally, on the periphery of the scraper foil 23a, 23b, an elastic layer of flexible material and / or designed in a flexible cross-section may be provided. When a rubber-like material is used, the elastic layer can be vulcanized. For other materials, other bonding methods for integration with flakes, such as crimping / elastic gripping, adhesive application, etc., can be considered.

To avoid oil overflow in the scraping area, scraped off oil or oil mixtures containing the cylinder oil and the combustion residues should be vented away from the scraping area. To this end, the holder ring 21 is provided with at least one outlet 28 which is open in the region between the two scraper foils 23a, 23b. In the embodiment shown in Fig. 4, the holder ring 21 is provided with at least one respective discharge groove 29 at least on the front side thereof, at least on the front side thereof, adjacent to the rear flake 23a . Of course, two or more outlets and / or discharge grooves may be provided which are arranged uniformly around the holder ring 21. To discharge the collected oil, the outlet (s) 28 and the drain groove (s) 29 are in communication with the discharge line 30 shown in Figure 2, which is connected to an oil reservoir (not shown) This can be done. The oil drained by the outlet 28 and the outlet groove 29 is forced into the associated annular groove 22 of the housing 17 and each such groove 22 of the housing 17 is subjected to a permanent flow And may be connected to the discharge line 30 so that a path is given.

The holder ring 21 and the associated scraper foil pieces 23a and 23b can be used to simply install the scraper ring 19 around the piston rod 11 held in place through the scavenging chamber bottom 8 or crankcase ceiling The scraper ring 19 may be divided in the circumferential direction. Therefore, the holder ring 21 and the scraper foil pieces 23a and 23b are formed of a segment piece set. In the embodiment shown in FIG. 5, three-segment segmentation is used. Thus, three segment segments 19a, 19b and 19c, each forming 120 degrees, are provided. In order to avoid forming a straight channel for the scraped and removed oil, the gap between the various segment segments 19a, 19b, 19c, at least at both ends of the segment segment of the holder ring 21, A tongue 31 is provided. Thus, when the scraper flakes are also installed for use, the free passage through the double bendable channel of the gap 32 is significantly reduced.

In practice, the areas of overlapping tongues can be blocked radially outward, so that the gaps 32 do not function as an obstructive leak channel that damages the discharge. For this purpose, as shown in Fig. 7, a cover element 33 may be provided which covers the gap 32 on the outside. The lid element 33 may be designed as a thin cover plate or band. In the embodiment shown in Fig. 7, the outer periphery of the holder ring 21, which is not circular, is flattened in each divided area and also in the area of each clearance 32, as indicated by the flat part 34 . In this case, the lid element 33 is designed to have a shape that coincides with a portion of the removed ring to obtain the flattened portion 34, so that the outer periphery of the flat portion 34, As shown in FIG. Of course, the housing 17 can be designed to be removable / mountable, with the piston rod still connected to the crosshead at the bottom and to the piston in the cylinder at the top.

In the embodiment described above with reference to a crosshead motor, the scraped fluid is a cylinder lubricant and the load is a piston rod. However, other uses, such as hydraulic cylinder piston devices, are also contemplated. In the above-described embodiment, the seal packing 15 provided with one or more scraping devices provides effective separation between the scavenging chamber 7 and the cylinder oil therein and the internal space of the crankcase 1 and the system oil therein Must be provided. A large amount of cylinder oil, which is generated at the start of the upward stroke of the piston and passes through the lower edge of the cylinder liner 4 and may be contaminated with the combustion residue, is directly sent to the piston rod 11 from the radial direction If it is mostly switched in the axial direction, the separation can be made easier.

To this end, as shown in Fig. 2, a skirt 35 may be provided which stands up from the scavenging chamber bottom 8 and surrounds the piston rod 11. As shown in Fig. This skirt (35) shields the piston rod (11) against the deposition of the cylinder oil particles and the combustion residue. In principle, a simple tubular structure for shielding the piston rod 11 may be sufficient. Preferably, funnel-shaped or trumpet-shaped top rims may be provided. In practice, the skirt 35 (preferably of a split design so as to be disposed around the mounted piston rod) may be attached to the upper flange of the housing 17, or as shown in Figure 2 And can be attached to the upper front end of the socket 18 surrounding the housing 17. [

Experience has shown that at least one element (preferably an RFID tag) comprising storage data for reliably identifying the element or device in at least one element of the scraping device according to the invention is provided, It can be useful in terms of assembly and maintenance. Advantageously, the identification data may also include manufacturing data, authorization data, history and possible or planned future usage data, and so on.

The above description of the preferred embodiments does not limit the scope of the invention as defined in the claims.

Claims

An apparatus for scraping a circumferential surface of a fluid wetted rod, the apparatus being sized for the rod, the rod comprising at least two scraper flakes (23a, 23b) The scraper flakes are spaced apart from one another in the axial direction and are respectively divided so as to allow for individual radial variations and are also radially protruded to form a common holder ring 21 Which is provided with respective radially inwardly open annular grooves for each of the flakes 23a, 23b, and the holder ring can likewise be radially varied due to the split design, Due to the spring arrangement associated with the radially outer surface of the holder ring, the spring bias for the area surrounded by the holder ring And at least the rear flake 23a in the direction of movement of the rod 11 is elastically radially supported with respect to the groove bottom of the annular groove of the flake 23a, To scratch the circumferential surface of the wet rod.

An apparatus for scrubbing the circumferential surface of a fluid wetted rod, the apparatus being sized for the rod, the rod having an opening (22) in the apparatus comprising at least two scraper foil pieces (23a, 23b) And the scraper foil pieces are separated from each other in the axial direction and are respectively divided so as to allow respective radial changes and are radially projected and accommodated in a common holder ring 21, The holder rings are provided with respective radially inwardly open annular grooves for the respective foil pieces 23a, 23b, and the holder ring can likewise be radially varied due to the split design, Due to the spring device associated with the radially outer surface, the spring biased adaptation to the area surrounded by the holder ring is less than half And at least one head piece 23b in the direction of movement of the rod 11 is elastically supported radially with respect to the groove bottom of the annular groove of the foil 23a, Apparatus for scratching the circumferential surface of a wet rod.

3. The method according to claim 1 or 2,
And each thin piece (23a, 23b) of the holder ring (21) is elastically supported.

3. The method according to claim 1 or 2,
Wherein at least the flexible padding (27) is disposed at the bottom of the associated annular groove for resiliently supporting the flakes (23a, 23b).

5. The method of claim 4,
Wherein the flexible padding (27) is formed of a ring made of an elastic material.

6. The method of claim 5,
Wherein the elastic ring is an O-ring.

7. The method according to any one of claims 1 to 6,
Wherein the resiliently supported scraper foil (23a, 23b) is provided at least on its radially outer surface with a layer of resilient material that allows the foil to move further radially outwardly under an increased biasing force.

The method according to claim 6,
Wherein the elastic layer is vulcanized at a radially outer circumferential surface of the scraper foil pieces (23a, 23b).

9. The method according to any one of claims 1 to 8,
Wherein at least two holder rings (21) each having two scraper flakes (23a, 23b) are provided in a common support structure (17).

10. The method according to any one of claims 1 to 9,
Wherein the holder ring (21) is provided with at least one outlet (28) which is open in the region between the two scraper flakes (23a, 23b).

11. The method according to any one of claims 1 to 10,
Wherein the holder ring (21) is provided with at least one respective discharge groove (29) in the region of at least one axial outer surface.

12. The method of claim 11,
Wherein the holder ring (21) has a discharge groove (29) in the region of both axially outer surfaces.

13. The method according to any one of claims 10 to 12,
Wherein each outlet (28) and / or outlet groove (29) can communicate with the outlet line (30).

14. The method of claim 13,
The holder ring 21 can be disposed in the associated radially inner open ring groove 22 of the annular housing 17 and the ring groove 22 can be connected to the discharge line 30. [

15. The method according to any one of claims 1 to 14,
The holder ring 21 and the foil pieces 23a and 23b are circumferentially divided into a set of pieces 19a, 19b and 19c so that at least both ends of the pieces of the holder ring are provided with overlapping tongues 31 Device.

16. The method of claim 15,
Wherein an area of the tongue (31) overlapping each other is sealed with a lid element (33) disposed on a radially outer surface of the holder ring (21).

17. The method of claim 16,
The radially outer surface of the holder ring 21 has a flat portion 34 in the region of the tongue 31 which overlaps with each other and is provided with a corresponding respective cover element 33, And fills each space formed inside the generally circumferential surface of the outer and the holder ring.

18. The method according to any one of claims 1 to 17,
Wherein said holder ring (31) is provided with a radially outer open annular groove (25) for receiving an annular spring (24) forming an associated spring arrangement.

19. The method according to any one of claims 1 to 18,
Wherein a majority of said holder ring (31) can be received in a common annular housing (17).

20. The method of claim 19,
Wherein the common annular housing (17) in which a majority of the holder ring (31) can be received is of a split design so that it can be placed around its rod without the passage of the rod end.

An apparatus for scraping and removing a cylinder lubrication oil for a piston rod of a motor vehicle according to any one of claims 1 to 3, wherein the scraping off fluid is a cylinder lubricant.

22. The method of claim 21,
Wherein the rod is a piston rod (11) of a motor vehicle having a piston rod (11).

23. The method according to any one of claims 1 to 22,
Wherein at least one element of the apparatus is provided with at least one tag comprising storage data for reliably identifying the element or apparatus.

24. The method of claim 23,
Wherein the tag is an RFID type device.

1. A crosshead-type engine, in particular a large reciprocating piston 2-stroke internal combustion engine, having a crankcase 1 and at least one cylinder 3, said cylinder extending inside a surrounding scavenge chamber 7 A cylinder liner 4 and a piston 5 disposed in the cylinder 3. The piston 5 has an associated crosshead 10 disposed in the crankcase 1 and a piston rod 11 , The piston rod passing through a seal packing (15) disposed in a wall between the scavenging chamber (7) and the crankcase (1), at least one of the seal packing (15) 26. A crosshead-like engine comprising at least one device according to any one of the preceding claims.

26. The method of claim 25,
For the at least one piston rod 11, there is provided a skirt 35 standing upright from the bottom of the scavenging chamber 8, the skirt comprising an associated piston rod 11 associated with the at least one seal packing 15, ). &Lt; / RTI >

27. The method of claim 26,
The skirt 35 is attached to the upper flange of the housing 17 of the seal packing 15 or attached to the upper front end of the socket 18 surrounding the housing 17 of the seal packing 15, Institution.