DE102017201741A1 - Piston connecting rod device for direct piston lubrication and cooling - Google Patents

Abstract

The invention relates to a piston-rod device (10) for direct piston lubrication and cooling, comprising a piston (42) of an internal combustion engine, a connecting rod (12) for connecting the piston (42) to a crankshaft (68) and a first of a connecting rod (22) of the connecting rod (12) to the piston (42) leading channel (30) for conducting a fluid for lubricating the piston (42). According to the invention, the piston-connecting rod device (10) has a second passage (36) leading from the connecting rod end (22) to the piston (42) for conducting a fluid for cooling the piston (42), wherein the first channel (30) and the second Channel (36) within the piston-connecting rod device (10) are fluidly separated from each other.

Description

The invention relates to a piston-rod device for direct piston lubrication and cooling according to the preamble of claim 1, comprising a piston of an internal combustion engine and a connecting rod for articulating the piston to a crankshaft.

For the required lubrication of a movement of a piston, in particular a piston of an internal combustion engine such as an internal combustion engine, and of components applied to the piston devices are known from the prior art, which serve to simplify a supply and / or an improved utilization of a lubricant.

So is already in the DE 344 269 C proposed a lubricating device for pistons and piston pins of internal combustion engines, in which incorporated on the outer surface of the piston grooves which record from a cylinder wall at locations of a largest occurring between the piston and cylinder wall surface pressure lube oil and guide to the piston pin, are made laterally only at those locations where there is a tight seal between the piston and the cylinder wall.

In the DE 2 318 113 A is a device on a piston for influencing the lubricant circulation, in particular in piston engines or reciprocating compressors described. There it is proposed that provided with annular grooves in the outer wall of the piston associated bores in a connecting rod and in the piston. The connection between a present in the piston reservoir for the lubricant and the holes leading directly to the annular grooves is made via rolled pins. The pins protrude out of the inner surface of the wall of the piston and into the reservoir.

In the GB 2 047 843 A a lubrication system for the cylinder of an internal combustion engine is described in which lubricant is passed through a piston moving in the cylinder against the cylinder wall of the cylinder. The piston has a piston pin above which a plurality of piston rings seals a combustion chamber at the top of the piston. On an outer circumferential surface of the piston, a lubricating groove is arranged between the piston pin and at least a majority of the piston rings. The lubrication groove is open in a direction outward of the piston. Lubricant supply channels are connected from an interior of the piston to the lubrication groove. The lubricant is supplied to the lubricant supply passages through a passage in the connecting rod, through passages in the piston pin and through a passage in the piston. These channels can also serve as feed channels for a piston head cooling system, where oil is directed into a collection cavity in the piston. The lubricant supply channels are subject to constant overpressure when the machine is constantly running.

In addition, the describes DE 27 56 424 A1 a piston for a work machine, in particular a stepped piston of a stepped piston compressor, with an oil passage through a hollow piston pin, wherein the oil may be provided for lubrication and / or cooling. The piston pin is inserted into a shoulderless, transverse through bore of the piston and has a subsequent to its oil-bearing cavity, radial bore. Oil is supplied through a connecting rod with an oil hole running from one eye to another. It is proposed that in the radial bore of the piston pin on a part not required for the oil guide part of its length a pin is inserted, which secures the piston pin in the piston axially and against rotation.

Furthermore, in the DE 41 35 237 A1 a piston-rod assembly described with a cooled piston to which a connecting rod via a piston pin is articulated. The small connecting rod eye is supplied via a central oil hole in the connecting rod lubricating oil, which also serves to cool the piston head. For this purpose, an oil distributor is provided between the connecting rod and the piston head, which directs the lubricating oil in a ring-cooling chamber of the piston head. In one embodiment, the central oil hole is connected via an annular groove in the connecting rod with a radial bore which opens into the oil distributor, which communicates with the annular cooling space in the piston head.

The DE 42 09 827 A1 describes a piston lubrication system for a double-acting piston in internal combustion engines with vertical ducting in the piston rod and connecting the duct system to the lubricant reservoir and to an oil pump. The piston lubrication system solves the problem of creating a piston lubrication system for a double-acting piston, which is designed as a single-channel system, yet realized the supply and removal of the lubricant, guarantees a uniform lubricant distribution, both the flow direction and the flow rate of the lubricant can be freely selected and there is no dependency on piston sizing. For this purpose, it is proposed that the channel guide includes a part in the piston wall spirally extending channel section, which at regular intervals one behind the other and arranged having the piston outer wall opening lubricating slots through which the lubricant discharge takes place on the piston outer wall. When using better lubricant qualities can be used at high flow rates of the lubricant this advantageously simultaneously as additional cooling of the piston.

The DE 10 2013 225 063 A1 describes a connecting rod for an internal combustion engine. The connecting rod comprises a large connecting rod eye, a small connecting rod eye, wherein in the small connecting rod eye an eccentric with an eccentric to its outer diameter bearing bore for a piston pin is formed, and means for supporting the eccentric for preventing rotational movement of the eccentric relative to the connecting rod are provided. The means for supporting comprise a rack and pinion and a double-action hydraulic cylinder coupled to the rack and pinion. A first passage in the connecting rod is formed to supply the upper support chamber of the double-acting hydraulic cylinder with hydraulic fluid, and a second passage in the connecting rod is provided to supply the lower support chamber. Depending on which of the two channels is supplied with lubricating oil from the oil circuit of the internal combustion engine, the lower support chamber or the upper support chamber increases, and as a result, the piston moves in the direction of the small connecting rod or in the direction of the large connecting rod. This also changes the effective length of the connecting rod and the compression ratio of the internal combustion engine.

In today's internal combustion engines, the so-called piston crown spray oil cooling is also widely used, in which the bottom of the piston is sprayed from below with engine oil via an oil spray nozzle (also piston cooling nozzle) connected to an oil circuit, which also causes cooling in addition to the lubrication of the piston. The combination of the two functions inevitably leads to a compromise. In particular, in the latest types of internal combustion engines, in which, for example, during a warm-up phase, the piston crown spray oil cooling is turned off in order to get to an optimum engine temperature as quickly as possible, it may cause adverse effects on the lubrication function.

In view of the prior art presented, the field of piston-rod devices for internal combustion engines still offers room for improvement.

The invention has for its object to provide a piston-rod device with improved properties and uses in terms of lubrication and cooling of the piston.

According to the invention the object is achieved by a piston-rod connecting device with the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent subclaims.

It should be noted that the features listed in the following description as well as measures in any technically meaningful way can be combined with each other and show other embodiments of the invention. The description additionally characterizes and specifies the invention, in particular in connection with the figures.

The piston-connecting rod device according to the invention with direct piston lubrication and cooling has a piston of an internal combustion engine, in particular an internal combustion engine, a connecting rod for connecting the piston to a crankshaft, and a first channel leading from a connecting rod of the connecting rod to the piston for conducting a fluid for lubrication of the piston. The piston / conrod device further includes a second connecting rod leading from the piston to the piston for conducting a fluid for cooling the piston, wherein the first channel and the second channel within the piston-conrod device are fluidly separated from each other.

For the purposes of the invention, the term "fluidically separated from one another" is understood in particular to mean that no exchange of the fluids between the first channel and the second channel is provided.

The terms "first", "second", etc. used in this application are for the purpose of distinction only. In particular, by their use no order or priority of the objects mentioned in connection with these terms should be implied.

An advantage of the invention is that lubrication and cooling of the piston can be performed independently. As a result, for example, during a warm-up phase of an internal combustion engine, the cooling of the piston to be omitted in order to achieve an optimum engine temperature as quickly as possible, while the lubrication of the piston is maintained in an optimum manner. During operation of the piston, an optimum amount of the fluid may be supplied to cool the piston and, independently, an optimum amount of the fluid to lubricate the piston.

Furthermore, by the independent supply of optimal amounts of a fluid for lubrication and cooling of the piston excessive supply and wear, including consumption of the fluid can be reduced.

In one embodiment of the invention, a first portion of the first channel and a first portion of the second channel are formed in an interior of the connecting rod. In this case, an input of the portion of the first channel and an input of the portion of the second channel in a region of the connecting rod end of the connecting rod and one end of the first portion of the first channel and one end of the first portion of the second channel in a region of the small connecting rod are arranged.

This means can be provided in a structurally particularly simple way means for guiding the fluid from the connecting rod to Pleuelkopf.

Furthermore, it is proposed that the input of the second channel is formed by a circumferential around the large connecting rod groove. As a result, the fluid for cooling the piston can be supplied in a reliable and structurally simple manner during operation of the internal combustion engine.

In addition, it is proposed that the piston has a piston pin known per se, in which a first extended cavity as the second, with the first portion of the first channel fluidly connected portion of the first channel and a second extended cavity second, with the first portion of the second Channel are formed fluidically connected portion of the second channel.

For the purposes of the invention, the term "extended cavity" is to be understood in particular to mean that the cavity has a cross-sectional area which is enlarged in relation to a cross-sectional area of the relevant channel.

The fluid-filled cavities may advantageously serve as reservoirs for providing the fluid for lubricating the piston and the fluid for cooling the piston during short-term, dynamic changes in the operation of the internal combustion engine.

In one embodiment of the piston-rod connecting device, a plurality of piston lubrication channels extending in the interior of the piston are provided in the piston as sections of the first channel, and at least one piston cooling channel extending in the interior of the piston as a section of the second channel. The first cavity is fluidly connected to the piston lubrication passages of the plurality of piston lubrication passages, and the second cavity is fluidically connected to the at least one piston cooling passage. As a result, the fluid for cooling the piston and the fluid for lubricating the piston can be supplied to the piston in a reliable and structurally simple manner.

For the purposes of the invention, the term "plurality" is to be understood in particular as meaning a number of at least two. For the purposes of the invention, the term "intended for this purpose" is to be understood as being especially programmed, designed or arranged.

Preferably, the piston cooling channel may be formed at least partially circumferentially.

Advantageously, an outlet of the first passage is formed by a plurality of lubrication ports disposed on the outside of the piston, and the piston lubrication passages of the plurality of piston lubrication passages are fluidly connected to the plurality of lubrication ports, whereby the fluid for lubrication of the piston is particularly uniform on the outside of the piston Piston can be distributed.

In a further embodiment of the piston-conrod device, a valve is provided for controlling a volume flow of the fluid through the second channel. Thereby, the volume flow of the fluid for cooling the piston can be controlled in a simple and effective manner and independently of a volume flow of the fluid through the first channel.

The valve may, for example, be designed as a shut-off valve having an inlet and an outlet which releases or blocks a line of the fluid through the second channel. However, the valve can also be designed as a continuous valve, which is intended to continuously change the volume flow of the fluid through the second channel, in particular from a volume flow of zero to a maximum volume flow.

When the valve is connected on the input side to an oil supply source for providing the fluid for lubricating the piston, a particularly simple solution for a piston-conrod device with independent lubrication and cooling of the piston can be provided.

For example, the oil supply source for providing the fluid for lubricating the piston may be formed by a conventional oil supply source of a crank mechanism of an internal combustion engine.

In an advantageous embodiment of the piston-conrod device, the valve has a mechanically or electrically operable by remote control actuator. Thereby, the volume flow of the fluid for cooling the piston can be controlled depending on predetermined operating parameters of the internal combustion engine.

For example, the valve may include a mechanically operable actuator coupled to a thermostat so that the valve is provided to release the flow of fluid through the second passage in response to an operating temperature of the internal combustion engine.

For example, the valve may comprise an electrically operable by remote control actuator, which is electrically connectable to an electronic control unit of a vehicle which is equipped with the piston-conrod device, whereby a particularly comfortable control of the volume flow of the fluid to cool the piston in Depending on predetermined operating parameters of the internal combustion engine can be achieved.

In a further aspect of the invention, a crank mechanism of an internal combustion engine, in particular of an internal combustion engine, is provided. The crank mechanism includes a crankshaft and a plurality of disclosed piston-rod devices articulated to the crankshaft with the connecting rod. The advantages described in connection with the various embodiments of the piston-rod device according to the invention are fully applicable to the crank mechanism.

More preferably, the crank mechanism of an internal combustion engine includes a plurality of two, four, five, six, or eight or more piston-and-rod assemblies.

• 1 eine erfindungsgemäße Kolben-Pleuel-Vorrichtung zur direkten Kolbenschmierung und -kühlung in einer schematisierten Vorderansicht,
• 2 die erfindungsgemäße Kolben-Pleuel-Vorrichtung gemäß 1 in einer schematisierten Seitenansicht,
• 3 ein Detail der erfindungsgemäßen Kolben-Pleuel-Vorrichtung gemäß 1 in einer schematisierten Vorderansicht, und
• 4 eine schematisierte Darstellung eines Kurbeltriebs eines Verbrennungsmotors mit erfindungsgemäßen Kolben-Pleuel-Vorrichtungen gemäß 1 in einer schematisierten Vorderansicht.

Further advantageous embodiments of the invention are disclosed in the subclaims and the following description of the figures. Show it:

• 1 a piston-connecting rod device according to the invention for direct piston lubrication and cooling in a schematic front view,
• 2 the piston-connecting rod device according to the invention according to 1 in a schematic side view,
• 3 a detail of the piston-connecting rod device according to the invention according to 1 in a schematic front view, and
• 4 a schematic representation of a crank mechanism of an internal combustion engine according to the invention with piston-connecting rod devices 1 in a schematic front view.

In the different figures, the same parts are always provided with the same reference numerals, which is why these are usually described only once.

1 shows a piston-connecting rod device according to the invention 10 for direct piston lubrication and cooling in a schematic front view. In 2 is the piston-connecting rod device according to the invention 10 shown in a schematic side view. 3 shows the upper portion of the piston-connecting rod device according to the invention 10 in a schematic front view. In the following, the piston-connecting rod device 10 based on 1 to 3 described.

The piston-connecting rod device 10 includes a piston 42 an internal combustion engine (not shown) formed by an internal combustion engine and a connecting rod 12 for the articulation of the piston 42 to a crankshaft. The piston 42 has a piston head in a known manner 44 with a piston bottom 46 ( 2 ), which is equipped in a known manner with a combustion bowl. Furthermore, the piston head comprises 44 ring grooves 48 ( 2 ) for receiving piston rings (not shown).

The connecting rod 12 includes in a conventional manner a connecting rod shank 14 , a near the piston end of the connecting rod shaft 14 molded small connecting rod eye 16 (Pleuelkopf) and at the piston remote end of the connecting rod shaft 14 molded large connecting rod eye 20 (split, with a big conch 22 and connecting rod cover 26 ). The piston-connecting rod device 10 has a piston pin 50 up, through the small connecting rod eye 16 and a through bore of the piston 42 is plugged and by means of which the piston 42 to the connecting rod 12 is articulated. The big connecting rod eye 20 serves for articulation of the piston-connecting rod device 10 to a crankshaft 68 ( 4 ).

How best of the 1 can be seen, the piston-connecting rod device 10 two channels formed by bores 30 . 36 on. A first channel 30 the two channels 30 . 36 leads from the big end 22 to the piston 42 and serves to direct a fluid to lubricate the piston 42 , A second channel 36 the two channels 30 , 36 also leads from the big end 22 to the piston 42 and serves to direct a fluid to cool the piston 42 , The two channels 30 . 36 are inside the piston-rod device 10 fluidically separated from each other.

In an interior of the connecting rod 12 are a first part 34 of the first channel 30 and a first part 40 of the second channel 36 educated. An entrance 32 of the first channel 30 is in an area of the big end of the ball 22 namely on an inner surface 24 of the big end 22 and in an installed state of the crankshaft 68 facing, arranged. An entrance 38 of the second channel 36 is also in an area of the big end 22 arranged, namely on a side surface 28 the large connecting rod eye 20 , There is the entrance 38 of the second channel 36 from one around the big eye 20 formed around circumferential groove. An end of the first section 34 of the first channel 30 and an end of the first part 40 of the second channel 36 are in an area of the small connecting rod eye 16 namely on an inner surface 18 the small connecting eye 16 , arranged ( 3 ).

In the piston pin 50 is a first extended cylindrical cavity 52 formed, the second, with the first section 34 of the first channel 30 fluidically connected portion of the first channel 30 serves. Furthermore, in the piston pin 50 a second extended cylindrical cavity 54 formed as the second portion of the second channel 36 with the first part 40 of the second channel 36 fluidically connected.

The piston 42 is with a lot of inside the piston 42 extending piston lubrication channels 56 equipped, the sections of the first channel 30 form ( 2 and 3 ). In 2 is only the first channel 30 shown. On a representation of the second channel 36 was omitted for reasons of clarity. The first cavity 52 is with the piston lubrication channels 56 the variety of piston lubrication channels 56 fluidically connected. The piston lubrication channels 56 the variety of piston lubrication channels 56 are with a variety of lubrication openings 58 fluidically connected. An output of the first channel 30 is thus of the multitude of on the outside of the piston 42 arranged lubrication openings 58 educated.

That on the inside surface 24 of the big end 22 in the first channel 30 entering fluid for lubrication of the piston 42 occurs at the lubrication openings 58 the multitude of on the outside of the piston 42 arranged lubrication openings 58 out. The supply of the fluid is ensured due to the prevailing pressure.

As part of the second channel 36 is one inside the piston 42 extending and circumferential piston cooling channel 60 intended ( 3 ). The second cavity 54 is with an inlet opening of the piston cooling channel 60 fluidically connected. Possible is an embodiment in which as a section of the second channel 36 inside the piston 42 two piston cooling channels are provided. The second cavity 54 is fluidly connected as before with an inlet opening of the respective piston cooling channel. The two piston cooling channels extend in the circumferential direction by approximately 180 ° so that a circulation is formed, wherein the two piston cooling channels have a common inlet opening. The fluid flows out of an opening of the cooling channel 60 due to gravity back into the oil pan. The cooling channels can also be designed so that they extend in different circumferential angles. Thus, one of the piston cooling channels could have an amount of 270 °, and the other an amount of 90 °. Of course it is also possible a configuration which does not extend to the entire circumference.

4 shows a schematic representation of a crank mechanism 66 an internal combustion engine with piston-connecting rod devices according to the invention 10 according to the 1 in a schematic front view, wherein was dispensed with a representation of the first channel.

The crank mechanism 66 has a crankshaft 68 on that with main bearings 70 in the crankcase (not shown) is mounted. Each piston-rod device 10 the plurality of four piston-connecting rod devices (two of which are in 4 shown) is in a conventional manner with the large connecting rod 20 on a crankpin 72 the crankshaft 68 hinged and with the upper bearing shells 74 and lower cups 76 at the respective crank pin 72 stored. The side surfaces 28 of the big end 22 each piston-connecting rod device 10 are in the in 4 shown, installed state of the piston-conrod device 10 each in contact with crank webs 78 the crankshaft 68 ,

To supply the crank mechanism 66 with a fluid formed by lubricating oil for lubricating the pistons 42 are in a conventional manner an oil supply source 62 in the form of a lube main gallery and supply lines going out from the lube main gallery to the main warehouses 70 intended. From the main camps 70 The lubricating oil is through grooves and through holes in the crank webs 78 to the crank pins 72 directed (in 4 symbolized for clarity by dashed lines). On the inner surface 24 the large connecting rod eye 20 the lubricating oil is in the first channel 30 initiated ( 1 ).

To supply the crank mechanism 66 with a fluid formed by lubricating oil for cooling the piston is a valve 64 provided, the input side with the oil supply source 62 for providing the fluid for lubricating the pistons 42 connected is. The valve 64 is for controlling a volume flow of the lubricating oil through the second channel 36 each of the piston-rod devices 10 intended.

In the 4 is the valve 64 schematized as near the crankshaft 68 arranged shown. Actually, that's the valve 64 positioned on an outside of the crankcase, and conduits to and from the valve 64 are passed through passages mounted in the crankcase. The valve 64 is designed as a continuous valve, and in particular as a control valve and has an electrically actuatable by remote control, for example by an electronic control unit of a vehicle in which the internal combustion engine is installed, operable actuator. Using the valve 64 can the volume flow of the fluid through the second channel 36 each of the piston-rod devices 10 in a continuous manner, namely from a volume flow of zero to a maximum flow rate of a capacity of the oil supply source 62 is determined to be changed.

From an outlet of the valve 64 The lubricating oil is supplied via a supply line to a spur line in one of the main bearings 70 the crankshaft 68 fed. The stub leads by means of a transversely guided passage opening in the main bearing 70 to circumferential annular grooves 80 on the side surfaces of the main warehouse 70 , which engage with the crank webs 78 are located. About the ring grooves 80 the main camp 70 and through holes in the crank webs 78 (in 4 symbolized for clarity by dashed lines) the lubricating oil reaches the inputs 38 the second channels 36 the piston connecting rod devices 10 in which it as already described above from the big end 22 the connecting rod 12 to the piston cooling channel 60 the respective piston-connecting rod device 10 to be led.

LIST OF REFERENCE NUMBERS

10

Piston-connecting rod device

12

connecting rod

14

connecting rod shaft

16

small connecting rod eye (connecting rod head)

18

palm

20

big connecting rod eye

22

Connecting rod

24

palm

26

connecting rod

28

side surface

30

first channel

32

entrance

34

first part

36

second channel

38

entrance

40

first part

42

piston

44

piston head

46

piston crown

48

ring groove

50

piston pin

52

first cavity (second portion of the first channel)

54

second cavity (second portion of the first channel)

56

Piston lubrication channel

58

lubrication hole

60

Piston cooling channel

62

Oil supply source

64

Valve

66

crankshaft

68

crankshaft

70

main bearing

72

crank pins

74

upper bearing shell

76

lower bearing shell

78

crank web

80

ring groove

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 344269 C [0003]
• DE 2318113 A [0004]
• GB 2047843 A [0005]
• DE 2756424 A1 [0006]
• DE 4135237 A1 [0007]
• DE 4209827 A1 [0008]
• DE 102013225063 A1 [0009]

Claims (10)

Piston-connecting rod device (10) for direct piston lubrication and cooling, comprising a piston (42) of an internal combustion engine, a connecting rod (12) for connecting the piston (42) to a crankshaft (68) and a first of a connecting rod (22 ) of the connecting rod (12) to the piston (42) leading channel (30) for conducting a fluid for lubricating the piston (42), characterized by a second from the connecting rod (22) to the piston (42) leading channel (36) for conducting a Fluid for cooling the piston (42), wherein the first channel (30) and the second channel (36) within the piston-connecting rod device (10) are fluidly separated from each other. Piston-connecting rod device (10) according to Claim 1 characterized in that in an interior of the connecting rod (12) a first portion (34) of the first channel (30) and a first portion (40) of the second channel (36) are formed, wherein an input (32) of the portion ( 34) of the first channel (30) and an inlet (38) of the portion (40) of the second channel (36) in an area of the connecting rod (22) of the connecting rod (12) and an end of the first portion (34) of the first channel (30) and an end of the first portion (40) of the second channel (36) in a region of the small connecting rod eye (16) are arranged. Piston-connecting rod device (10) according to Claim 1 or 2 , characterized in that the entrance (38) of the second channel (36) is formed by a circumferential around the large connecting rod eye (20) groove. Piston-connecting rod device (10) according to any one of the preceding claims, characterized in that the piston (42) has a piston pin (50) in which a first extended cavity (52) second, with the first portion (34) of the first channel (30) fluidly connected portion of the first channel (30) and a second extended cavity (54) as a second, with the first portion (40) of the second channel (36) fluidly connected portion of the second channel (36) are formed. Piston-connecting rod device (10) according to any one of the preceding claims, characterized in that - in the piston (42) as portions of the first channel (30) a plurality of in the interior of the piston (42) extending piston lubrication channels (56) and as a part at least one piston cooling passage (60) extending in the interior of the piston (42) is provided in the second passage (36), and - a first cavity (52) is fluidically connected to the piston lubrication passages (56) of the plurality of piston lubrication passages and a second cavity (54 ) is fluidically connected to the at least one piston cooling channel (60). Piston-connecting rod device (10) according to one of the preceding claims, characterized in that an outlet of the first channel (30) is formed by a plurality of lubrication openings (58) arranged on the outside of the piston (42) and in that the piston lubrication channels ( 56) of the plurality of piston lubrication passages are fluidly connected to the plurality of lubrication ports. Piston-connecting rod device (10) according to any one of the preceding claims, characterized in that a valve (64) for controlling a volume flow of the fluid through the second channel (36) is provided. Piston-connecting rod device (10) according to Claim 7 Characterized in that the valve (64) on the input side with an oil supply source (62) for providing the fluid to the lubrication of the piston (42) is connected. Piston-connecting rod device (10) according to Claim 7 or 8th , characterized in that the valve (64) has a mechanically or electrically operable by remote control actuator. A crank mechanism (66) of an internal combustion engine, comprising a crankshaft (68) and a plurality of piston-connecting rod devices (10), in particular according to one of the preceding claims, wherein in the connecting rod (12) for coupling a piston (42) to the crankshaft ( 68) a first of a connecting rod (22) of the connecting rod (12) to the piston (42) leading channel (30) for conducting a fluid for lubricating the piston (42) and a second from the connecting rod (22) to the piston (42) leading Channel (36) for conducting a fluid for cooling the piston (42) are arranged, wherein the first channel (30) and the second channel (36) within the piston-connecting rod device (10) are fluidly separated from each other.

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