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WO2019154585A1 - Connecting rod for an internal combustion engine and corresponding internal combustion engine - Google Patents

Connecting rod for an internal combustion engine and corresponding internal combustion engine Download PDF

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Publication number
WO2019154585A1
WO2019154585A1 PCT/EP2019/050685 EP2019050685W WO2019154585A1 WO 2019154585 A1 WO2019154585 A1 WO 2019154585A1 EP 2019050685 W EP2019050685 W EP 2019050685W WO 2019154585 A1 WO2019154585 A1 WO 2019154585A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting rod
hydraulic
eccentric
combustion engine
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/050685
Other languages
German (de)
French (fr)
Inventor
Simon Ochsenkühn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Audi AG
Original Assignee
Audi AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Audi AG filed Critical Audi AG
Publication of WO2019154585A1 publication Critical patent/WO2019154585A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/06—Adjustable connecting-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines

Definitions

  • the invention relates to a connecting rod for an internal combustion engine, with a first connecting rod eye, in which a crank pin of a crankshaft of the internal combustion engine is rotatably supported about a rotational axis, with a second connecting rod for pivotally connecting a piston of the internal combustion engine and with an adjusting device for adjusting an effective distance between centers of the connecting rods, wherein the adjusting device has a first hydraulic cylinder and a second hydraulic cylinder which can be acted on by hydraulic fluid to adjust the effective distance by means of an eccentric associated with one of the connecting rods.
  • the invention further relates to an internal combustion engine.
  • document DE 10 2013 225 063 A1 shows a connecting rod whose effective length between small connecting rod eye and large connecting rod eye can be adjusted by an eccentric on the small connecting rod eye.
  • a locking of the eccentric is effected by means of a rack and pinion and a double-acting hydraulic cylinder.
  • a connecting rod having the features of claim 1. It is provided that a first hydraulic piston displaceably mounted in the first hydraulic cylinder and a second hydraulic piston mounted axially displaceably in the second hydraulic cylinder are coupled to the eccentric via at least one traction means.
  • the connecting rod is, for example, part of the internal combustion engine, which preferably serves to drive a motor vehicle, insofar as it serves to provide a torque directed at the driving of the motor vehicle.
  • the internal combustion engine has at least one cylinder, in which a piston is arranged to be displaceable.
  • the piston is connected via the connecting rod to the crankshaft, which is rotatably mounted about a rotation axis.
  • the crankshaft is in the form of an eccentric shaft and has the crank pin, which is arranged eccentrically with respect to the axis of rotation.
  • the connecting rod On the crank pin, the connecting rod is rotatably mounted.
  • the connecting rod has the first connecting rod eye, which receives the crank pin of the crankshaft in itself and is rotatably mounted about this.
  • the connecting rod is rotatably mounted about the axis of rotation on the crank pin.
  • the axis of rotation of the connecting rod about the crank pin is preferably parallel to the axis of rotation of the crankshaft.
  • the connecting rod On the side facing away from the crankshaft the connecting rod, the piston is connected to this.
  • the connecting rod has the second connecting rod eye, in which a piston pin of the piston is pivotally mounted.
  • the connecting rod is also rotatably mounted with respect to the piston, namely via an axis of rotation which is arranged parallel to and spaced apart from the above-described axes of rotation.
  • the connecting rod has the adjusting device, by means of which the effective distance between the center points of the connecting rod eyes can be adjusted.
  • a first setting a first effective distance is present in this respect, and a second effective distance has a second effective distance, wherein the two effective distances are shifted from one another.
  • an internal combustion engine with a variable compression ratio can be realized in a simple manner so that a change in the effective compression ratio realizes a change in the effective distance during operation of the internal combustion engine is.
  • the connecting rod can also be referred to as a VCR connecting rod (VCR - Variable Compression Ratio).
  • the adjusting device has the two hydraulic cylinders, that is to say the first hydraulic cylinder and the second hydraulic cylinder.
  • the adjusting device is designed such that at a pressure load of the connecting rod, which is directed to a reduction of the effective distance between rule the centers of the connecting rods, the first hydraulic cylinder is pressurized, whereas in a tensile load of the piston rod, which on a Increasing the effective distance is directed, the second hydraulic cylinder pressure is applied.
  • the adjusting device is designed as Exzenterverstell Surprise and accordingly has in addition to the hydraulic cylinders on the eccentric.
  • one of the connecting rod is formed, preferably the second connecting rod eye.
  • the eccentric is rotatably mounted about a rotation axis rotatably mounted on a base body of the connecting rod, wherein in the base body, the respective other connecting rod, for example, the first connecting rod, is present.
  • the axis of rotation about which the eccentric is rotatably mounted on the base body is arranged at a parallel distance from a longitudinal central axis of the connecting rod eye formed in the eccentric, in particular therefore of the second connecting rod eye.
  • the eccentric is coupled via the at least one traction means with the hydraulic piston, which are arranged axially displaceable in the hydraulic cylinders.
  • the axial displaceability of the hydraulic piston means a linear displaceability in the direction of a longitudinal center axis of the hydraulic cylinder or of the hydraulic piston.
  • the operative connection between the hydraulic pistons and the eccentric are produced via the traction means, namely such that upon a displacement of the hydraulic pistons in the hydraulic cylinders a rotational movement of the eccentric about its axis of rotation is effected for adjusting the effective distance between the centers of the connecting rods.
  • the traction means is preferably designed such that it can absorb only a tensile force, so far as it is limp.
  • a rigid traction means can be used. It can be provided that only a single traction means is present, which acts on the one hand on the first hydraulic piston and on the other hand on the second hydraulic piston and is also coupled to the eccentric. However, it may also be hen that the first hydraulic piston via a first traction means and the second hydraulic piston are coupled via a second traction means with the eccentric.
  • the traction means or the plurality of traction means can each wrap around the eccentric only partially, at least once or several times, at least temporarily as a function of the position of the eccentric.
  • the eccentric by applying pressure to the first hydraulic cylinder or the second hydraulic cylinder, the eccentric can be rotated about its axis of rotation.
  • the adjusting device is designed such that at a pressure load of the connecting rod, which is directed to the reduction of the effective distance between the center points of the connecting rods, the second hydraulic cylinder is zugbeaufschlagt on the traction means, whereas conditions at a tensile load of the connecting rod, which on the increase of the effective distance is directed, the first hydraulic cylinder is zugbeauf- strike.
  • it can also - depending on the configuration of the traction device - be provided the reverse procedure.
  • Such a design of the connecting rod allows a space-saving arrangement of the hydraulic cylinder, because these can be optimally arranged due to the coupling of the hydraulic piston with the eccentric on the, in particular pliable, traction means, for example, to achieve a uniform weight distribution of the connecting rod.
  • a protrusion of the hydraulic cylinder can be prevented via a basic geometry of the connecting rod, so that overall a lesser weight of the connecting rod is realized.
  • the hydraulic raulikkolben can be fixed in the hydraulic cylinders, so that there is a lock. For example, this is achieved by a fluidic obstruction of at least one of the hydraulic cylinders, preferably both hydraulic cylinders.
  • a further development of the invention provides that longitudinal central axes of the hydraulic cylinders are present parallel to one another and / or symmetrically with respect to a longitudinal central axis of the connecting rod. Due to the parallel Order of the hydraulic cylinder or its longitudinal central axes, the above-mentioned optimal arrangement can be realized, in which the hydraulic cylinders do not protrude beyond the basic geometry of the connecting rod. In addition, an otherwise occurring material accumulation is avoided in an advantageous manner.
  • the hydraulic cylinders or their longitudinal center axes may be arranged symmetrically, namely with respect to the longitudinal center axes of the connecting rod.
  • the hydraulic cylinders or their longitudinal center axes are each arranged spaced apart parallel to the longitudinal center axis of the connecting rod.
  • the longitudinal center axis of the connecting rod is preferably to be understood as meaning a longitudinal center axis of the base body already mentioned above. Such an arrangement also serves to realize a uniform weight distribution of the connecting rod.
  • a preferred further embodiment of the invention provides that the hydraulic cylinders have the same hydraulic volume. This means that at a position of the piston arranged in them such that the respective volume becomes maximum, the volume of the first hydraulic cylinder corresponds to the volume of the second hydraulic cylinder. As a result, the uniform weight distribution of the connecting rod is achieved. Alternatively, it may of course also be provided that the volumes of the hydraulic cylinders are different.
  • the traction means is present as a rope, chain or belt.
  • the chain is particularly preferably in the form of a toothed chain and the belt in the form of a toothed belt before.
  • the traction means is preferably designed as a limp, so at least not loadable on pressure, but rather only on train loadable.
  • the use of the rope, the chain or the belt as a traction means allows a significant weight reduction of the connecting rod in comparison with known embodiments. Also a rigid version staltung of the traction means can be realized, in particular if it is in the form of the chain.
  • a further embodiment of the invention provides that the eccentric is provided on the outside with a toothing chain with the tooth or the toothed belt is engaged.
  • the eccentric is, as already explained, mounted rotatably about its axis of rotation on the main body of the connecting rod. In the radial direction with respect to the axis of rotation outside, it has the toothing, which can also be referred to as external toothing.
  • the teeth mesh with the toothed chain or the timing belt, so it is with this or this in engagement. This results in a particularly reliable power transmission from the traction means to the eccentric.
  • the traction means is formed continuously and the eccentric partially encompassing, wherein it is attached on the one hand to the first hydraulic piston and on the other hand to the second hydraulic piston. In such an embodiment of the connecting rod, only a single traction means is provided, which extends from the first hydraulic piston to the second hydraulic piston he stretches and in this case partially surrounds the eccentric.
  • the traction means extends from the first hydraulic raulikkolben towards the eccentric and from the eccentric to the hydraulic piston.
  • the traction means is respectively attached to the two hydraulic pistons and engages around the eccentric in such a way that a mechanical coupling is produced between the hydraulic pistons and the eccentric via the traction means.
  • Such a design of the connecting rod is particularly simple and inexpensive to implement.
  • a further preferred embodiment of the invention provides that the traction means acts on the first hydraulic piston via a first push rod and on the second hydraulic piston via a second push rod.
  • the first push rod is so far on the one hand on the first hydraulic piston and on the other hand attached to the traction means and the second push rod on the one hand to the second hydraulic piston and on the other hand to the traction means.
  • a rigid connection between the traction means and the respective hydraulic piston is produced via the push rods.
  • the push rods are preferably each formed straight straight. The use of the push rods enables a particularly simple and efficient guidance of the traction means.
  • the traction means at one lying between the first hydraulic piston and the eccentric first position and / or at a lying between the second hydraulic piston and the eccentric second point or one foundedseinrich- device for guiding the traction means on the Pulling means attacks.
  • the guide device may be present only at one of the two points, or alternatively a plurality of guide devices may be arranged on the connecting rod, the first point being guided by means of a first one of the guide devices and the second point being guided by a second one of the guide devices.
  • the traction means engages the guide means or engage the guide means on the traction means. For example, it follows the guide such that at the first location and / or the second Stel le deflection of the traction device occurs.
  • the guide means or the guide means are configured such that the traction means, starting from the first hydraulic piston and / or from the second hydraulic piston to the first location and / or the second location is straight or at least almost straight and particularly preferred coincides with the longitudinal center axis of the respective hydraulic cylinder.
  • the straight configuration of the traction means can also be effected by an embodiment of the eccentric such that its outer diameter corresponds to the distance between the hydraulic piston.
  • the guide device or the guide devices enable a reliable and low-wear operation of the connecting rod.
  • the guide device is a guide sleeve.
  • the guide sleeve is fastened to the connecting rod or the base body of the connecting rod and is stationary to that extent.
  • the guide sleeve engages around the traction means at least partially, in particular completely, in order to achieve a particularly reliable guidance of the traction means.
  • the guide sleeve is arranged such that the traction means extends straight from the respective hydraulic piston up to the guide sleeve, in particular on the longitudinal central axis of the hydraulic cylinder or hydraulic piston and / or spaced parallel from a longitudinal center axis of the connecting rod or its Basic body.
  • Such a design of the guide device enables the reliable and low-wear operation of the connecting rod.
  • a development of the invention provides that the traction means is pivotally mounted on the push rods.
  • the Switzerlandmit- tel is mounted pivotably on each of the push rods. As a result, wear of the traction device is minimized.
  • the push rods have a distance from one another which is smaller than an outer diameter of the eccentric. Accordingly, an extremely compact and lightweight design of the connecting rod is realized.
  • the invention further relates to an internal combustion engine, with a connecting rod, in particular a connecting rod according to the statements in this description, wherein the connecting rod via a first Pleu- lohlauge in which a crank pin of a crankshaft of the internal combustion engine is rotatably mounted about a rotational axis over a second connecting rod eye for pivotally connecting a piston of the internal combustion engine and has an adjusting device for adjusting an effective distance between centers of the connecting rod, wherein the adjusting device comprises a first hydraulic cylinder and a second hydraulic cylinder, which can be acted upon for adjusting the effective distance by means of an eccentric associated with one of the Pleu- laugen with hydraulic fluid. It is provided that a first hydraulic piston axially displaceably mounted in the first hydraulic cylinder and a second hydraulic piston axially displaceably mounted in the second hydraulic cylinder are coupled to the eccentric via at least one traction means.
  • FIG. 1 shows a schematic representation of a connecting rod for an internal combustion engine, which has an adjusting device for adjusting an effective distance between two connecting-rod eyes.
  • FIG. 1 shows a schematic representation of a region of an internal combustion engine 1, namely a connecting rod 2.
  • the connecting rod 2 has a first connecting rod eye 3 and a second connecting rod eye 4.
  • the first connecting rod 3 surrounds, for example, a crank pin, not shown here, of a crankshaft of the internal combustion engine 1, so that a rotatable mounting of the connecting rod 2 is realized on the crank pin.
  • the second connecting rod eye 4 is present at an end opposite the first connecting rod eye 3 of the connecting rod 2. It is provided for sch wen kbeweg lent connection to a piston of the internal combustion engine 1 and formed.
  • the connecting rod 2 is designed as an adjustable connecting rod and has insofar an adjusting device 5, by means of which the distance between centers 6 and 7 of the connecting rod 3 and 4 is adjustable.
  • the adjusting device 5 has in the embodiment shown here a first hydraulic cylinder 8 and a second hydraulic cylinder 9, wherein in the first hydraulic cylinder 8, a first hydraulic piston 10 and in the second hydraulic cylinder 9, a second hydraulic piston 11 are arranged linearly displaceable.
  • the hydraulic pistons 10 and 11 are followed by push rods 12 and 13. These are preferably rigidly connected to the respective hydraulic piston 10 and 11 and / or integrally formed therewith and of the same material.
  • a traction means 14 is fixed, for example, hinged pivotally.
  • the traction means 14 is likewise fastened, in particular articulated.
  • the articulation of the traction means 14 to the push rods 12 and 13 is realized, for example, by means of bolts 15 and 16.
  • the second connecting rod 4 is disposed in an eccentric 17 and / or formed.
  • the eccentric 17 is rotatably superimposed on a pivot point of the center point 7 of the second connecting rod 4 different rotation axis, namely on a base body 18 of the connecting rod 2.
  • the eccentric 17 has on its outer periphery a toothing 19 which engages with the traction means 14 is, which is this example, as a toothed chain o- formed as a toothed belt.
  • the hydraulic cylinders 8 and 9 are connected via hydraulic lines 20 and 21 to a hydraulic fluid source.
  • the hydraulic cylinders 8 and 9 can be acted upon with hydraulic fluid via the hydraulic lines 20 and 21 or hydraulic fluid can be withdrawn from them via the hydraulic fluid line 20 and 21.
  • An adjustment of the eccentric and mit- towards a change in the effective distance of the centers 6 and 7 of the connecting rods 3 and 4 to each other can therefore be made by a corresponding loading of the hydraulic cylinders 8 and 9 with hydraulic fluid.
  • the embodiment of the connecting rod 2 described here has the advantage that the hydraulic pistons 10 and 11 are arranged parallel to one another, so that a uniform weight distribution of the connecting rod 2 or at least of its main body 18 is realized. In addition, areas projecting beyond an outer circumference of the main body 18 are largely or even completely avoided, so that an extremely low weight of the connecting rod 2 is realized.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention relates to a connecting rod (2) for an internal combustion engine (1), having a first connecting rod eye (3), in which a crankpin of a crankshaft of the internal combustion engine (1) can be rotatably mounted about a rotation axis, having a second connecting rod eye (4) for pivoting connection of a piston of the internal combustion engine (1) and having an adjusting device (5) for adjusting an effective distance between center points (6, 7) of the connecting rod eyes (3, 4), wherein the adjusting device (5) has a first hydraulic cylinder (8) and a second hydraulic cylinder (9), to which hydraulic fluid can be applied in order to adjust the effective distance by means of an eccentric cam (17) associated with one of the connecting rod eyes (3, 4). According to the invention, a first hydraulic piston (10), which is mounted in the first hydraulic cylinder (8) in an axially movable manner, and a second hydraulic piston (11), which is mounted in the second hydraulic cylinder (9) in an axially movable manner, are coupled to the eccentric cam (17) by at least one tension means (14). The invention further relates to an internal combustion engine (1).

Description

BESCHREIBUNG:  DESCRIPTION:

Die Erfindung betrifft eine Pleuelstange für eine Brennkraftmaschine, mit ei- nem ersten Pleuelauge, in dem ein Hubzapfen einer Kurbelwelle der Brenn- kraftmaschine um eine Drehachse drehbar lagerbar ist, mit einem zweiten Pleuelauge zur schwenkbeweglichen Anbindung eines Kolbens der Brenn- kraftmaschine und mit einer Verstelleinrichtung zur Verstellung eines effekti ven Abstands zwischen Mittelpunkten der Pleuelaugen, wobei die Verstel- leinrichtung einen ersten Hydraulikzylinder und einen zweiten Hydraulikzylin- der aufweist, die zum Verstellen des effektiven Abstands mittels eines einem der Pleuelaugen zugeordneten Exzenters mit Hydraulikfluid beaufschlagbar sind. Die Erfindung betrifft weiterhin eine Brennkraftmaschine. The invention relates to a connecting rod for an internal combustion engine, with a first connecting rod eye, in which a crank pin of a crankshaft of the internal combustion engine is rotatably supported about a rotational axis, with a second connecting rod for pivotally connecting a piston of the internal combustion engine and with an adjusting device for adjusting an effective distance between centers of the connecting rods, wherein the adjusting device has a first hydraulic cylinder and a second hydraulic cylinder which can be acted on by hydraulic fluid to adjust the effective distance by means of an eccentric associated with one of the connecting rods. The invention further relates to an internal combustion engine.

Aus dem Stand der Technik ist beispielsweise die Druckschrift DE 10 2014 101 929 A1 bekannt. Diese betrifft eine Pleuelstange mit einem Hublagerau- ge zur Anbindung derselben an eine Kurbelwelle, mit einem Pleuellagerauge zur Anbindung derselben an einen Kolben eines Zylinders, und mit einer Ex- zenter-Verstelleinrichtung zur Verstellung einer effektiven Pleuelstangenlän- ge, wobei die Exzenter-Verstelleinrichtung Exzenterstangen aufweist, die an einem Exzenterhebel der Exzenter-Verstelleinrichtung angreifen, wobei die Exzenter-Verstelleinrichtung einen Exzenter aufweist, der eine Bohrung zur Aufnahme eines Kolbenbolzens aufweist, und wobei in das Pleuellagerauge und in den Exzenter Schmierölbohrungen eingebracht sind, über die einer seits zwischen Pleuellagerauge und Exzenter und andererseits zwischen Exzenter und Kolbenbolzen ein Schmierölfilm aufbaubar ist. Weiterhin zeigt die Druckschrift DE 10 2013 225 063 A1 eine Pleuelstange, deren wirksame Länge zwischen kleinem Pleuelauge und großem Pleuelau- ge durch einen Exzenter am kleinen Pleuelauge einstellbar ist. Dabei wird eine Arretierung des Exzenters mithilfe eines Zahnstangentriebs und eines doppelt wirkenden Hydraulikzylinders bewirkt. From the prior art, for example, the document DE 10 2014 101 929 A1 is known. This relates to a connecting rod with a Hublagerau- ge for connecting the same to a crankshaft, with a connecting rod bearing eye for connecting the same to a piston of a cylinder, and with an eccentric adjusting device for adjusting an effective connecting rod length ge, wherein the eccentric adjusting eccentric rods has, which engage an eccentric lever of the eccentric adjusting device, wherein the eccentric adjusting device has an eccentric, which has a bore for receiving a piston pin, and wherein in the connecting rod bearing eye and in the eccentric oil holes are introduced, on the one hand between Pleuellagerauge and Eccentric and on the other hand between eccentric and piston pin a lubricating oil film is buildable. Furthermore, document DE 10 2013 225 063 A1 shows a connecting rod whose effective length between small connecting rod eye and large connecting rod eye can be adjusted by an eccentric on the small connecting rod eye. In this case, a locking of the eccentric is effected by means of a rack and pinion and a double-acting hydraulic cylinder.

Es ist Aufgabe der Erfindung, eine Pleuelstange für eine Brennkraftmaschine vorzuschlagen, welche gegenüber bekannten Pleuelstangen Vorteile auf- weist, insbesondere ein geringeres Gewicht und eine gleichmäßigere Ge- wichtsverteilung aufweist sowie zudem einfach und kostengünstig herstellbar ist. It is an object of the invention to propose a connecting rod for an internal combustion engine, which has advantages over known connecting rods, in particular has a lower weight and a more uniform weight distribution and is also easy and inexpensive to produce.

Dies wird erfindungsgemäß mit einer Pleuelstange mit den Merkmalen des Anspruchs 1 erreicht. Dabei ist vorgesehen, dass ein in dem ersten Hydrau- likzylinder verlagerbar gelagerter erster Hydraulikkolben und ein in dem zwei- ten Hydraulikzylinder axial verlagerbar gelagerter zweiter Hydraulikkolben über wenigstens ein Zugmittel mit dem Exzenter gekoppelt sind. This is achieved according to the invention with a connecting rod having the features of claim 1. It is provided that a first hydraulic piston displaceably mounted in the first hydraulic cylinder and a second hydraulic piston mounted axially displaceably in the second hydraulic cylinder are coupled to the eccentric via at least one traction means.

Die Pleuelstange ist beispielsweise Bestandteil der Brennkraftmaschine, welche bevorzugt dem Antreiben eines Kraftfahrzeugs, insoweit also dem Bereitstellen eines auf das Antreiben des Kraftfahrzeugs gerichteten Dreh- moments dient. Die Brennkraftmaschine weist wenigstens einen Zylinder auf, in welchem ein Kolben verlagerbar angeordnet ist. Der Kolben ist über die Pleuelstange an die Kurbelwelle angebunden, welche um eine Drehachse drehbar gelagert ist. Die Kurbelwelle liegt als Exzenterwelle vor und weist den Hubzapfen auf, welcher exzentrisch bezüglich der Drehachse angeord- net ist. The connecting rod is, for example, part of the internal combustion engine, which preferably serves to drive a motor vehicle, insofar as it serves to provide a torque directed at the driving of the motor vehicle. The internal combustion engine has at least one cylinder, in which a piston is arranged to be displaceable. The piston is connected via the connecting rod to the crankshaft, which is rotatably mounted about a rotation axis. The crankshaft is in the form of an eccentric shaft and has the crank pin, which is arranged eccentrically with respect to the axis of rotation.

Auf dem Hubzapfen ist die Pleuelstange drehbar gelagert. Hierzu verfügt die Pleuelstange über das erste Pleuelauge, welches den Hubzapfen der Kur- belwelle in sich aufnimmt und um diesen drehbar gelagert ist. Insoweit ist die Pleuelstange um die Drehachse drehbar an dem Hubzapfen gelagert. Die Drehachse der Pleuelstange um den Hubzapfen ist vorzugsweise parallel zu der Drehachse der Kurbelwelle. Auf der der Kurbelwelle abgewandten Seite der Pleuelstange ist der Kolben an diese angebunden. Hierzu verfügt die Pleuelstange über das zweite Pleuelauge, in welchem ein Kolbenzapfen des Kolbens schwenkbeweglich angeordnet ist. Schlussendlich ist also die Pleu- elstange auch bezüglich des Kolbens drehbar gelagert, nämlich über eine Drehachse, welche von den vorstehend beschriebenen Drehachsen parallel beabstandet angeordnet ist. On the crank pin, the connecting rod is rotatably mounted. For this purpose, the connecting rod has the first connecting rod eye, which receives the crank pin of the crankshaft in itself and is rotatably mounted about this. In that regard, the connecting rod is rotatably mounted about the axis of rotation on the crank pin. The axis of rotation of the connecting rod about the crank pin is preferably parallel to the axis of rotation of the crankshaft. On the side facing away from the crankshaft the connecting rod, the piston is connected to this. For this purpose, the connecting rod has the second connecting rod eye, in which a piston pin of the piston is pivotally mounted. In the end, therefore, the connecting rod is also rotatably mounted with respect to the piston, namely via an axis of rotation which is arranged parallel to and spaced apart from the above-described axes of rotation.

Die Pleuelstange verfügt über die Verstelleinrichtung, mittels welcher der effektive Abstand zwischen den Mittelpunkten der Pleuelaugen verstellt wer- den kann. Bei einer ersten Einstellung liegt insoweit ein erster effektiver Ab- stand und bei einer zweiten Einstellung ein zweiter effektiver Abstand vor, wobei die beiden effektiven Abstände voneinander verschieben sind. Mit ei- ner derartigen Ausgestaltung der Pleuelstange kann beispielsweise auf ein- fache Art und Weise eine Brennkraftmaschine mit variablem Verdichtungs- Verhältnis realisiert werden, sodass während eines Betriebs der Brenn kraft- maschine durch eine Veränderung des effektiven Abstands eine Verände- rung des effektiven Verdichtungsverhältnisses realisiert ist. Die Pleuelstange kann insoweit auch als VCR-Pleuelstange (VCR - Variable Compression Ratio) bezeichnet werden. The connecting rod has the adjusting device, by means of which the effective distance between the center points of the connecting rod eyes can be adjusted. With a first setting, a first effective distance is present in this respect, and a second effective distance has a second effective distance, wherein the two effective distances are shifted from one another. With such an embodiment of the connecting rod, for example, an internal combustion engine with a variable compression ratio can be realized in a simple manner so that a change in the effective compression ratio realizes a change in the effective distance during operation of the internal combustion engine is. The connecting rod can also be referred to as a VCR connecting rod (VCR - Variable Compression Ratio).

Die Verstelleinrichtung weist die beiden Hydraulikzylinder auf, also den ers- ten Hydraulikzylinder und den zweiten Hydraulikzylinder. Beispielsweise ist die Verstelleinrichtung derart ausgebildet, dass bei einer Druckbelastung der Pleuelstange, welche auf eine Verkleinerung des effektiven Abstands zwi schen den Mittelpunkten der Pleuelaugen gerichtet ist, der erste Hydraulikzy- linder druckbeaufschlagt wird, wohingegen bei einer Zugbelastung der Pleu- elstange, welche auf eine Vergrößerung des effektiven Abstands gerichtet ist, der zweite Hydraulikzylinderdruck beaufschlagt wird. The adjusting device has the two hydraulic cylinders, that is to say the first hydraulic cylinder and the second hydraulic cylinder. For example, the adjusting device is designed such that at a pressure load of the connecting rod, which is directed to a reduction of the effective distance between rule the centers of the connecting rods, the first hydraulic cylinder is pressurized, whereas in a tensile load of the piston rod, which on a Increasing the effective distance is directed, the second hydraulic cylinder pressure is applied.

Durch hydraulisches Verschließen des ersten Hydraulikzylinders und/oder des zweiten Hydraulikzylinders kann insoweit eine Veränderung des effekti ven Abstands unterbunden und durch hydraulisches Öffnen freigegeben werden. In anderen Worten kann durch entsprechendes Einstellen der Ver- stelleinrichtung das Verstellen des effektiven Abstands zugelassen oder un- terbunden werden. Alternativ kann es auch vorgesehen sein, durch eine Druckbeaufschlagung des ersten Hydraulikzylinders mit Hydraulikdruck den Abstand zwischen den Mittelpunkten der Pleuelaugen zu vergrößern oder durch eine Druckbeaufschlagung des zweiten Hydraulikzylinders den Ab- stand zu verringern. By hydraulically closing the first hydraulic cylinder and / or the second hydraulic cylinder so far a change in the effective distance can be suppressed and released by hydraulic opening. In other words, adjustment of the effective distance can be permitted or adjusted by appropriately adjusting the adjusting device. be bound. Alternatively, it can also be provided to increase the distance between the center points of the connecting rod eyes by pressurizing the first hydraulic cylinder with hydraulic pressure or to reduce the distance by pressurizing the second hydraulic cylinder.

Die Verstelleinrichtung ist als Exzenterverstelleinrichtung ausgebildet und weist entsprechend zusätzlich zu den Hydraulikzylindern den Exzenter auf. In dem Exzenter ist eines der Pleuelaugen ausgebildet, vorzugsweise das zweite Pleuelauge. Der Exzenter ist um eine Drehachse drehbar an einem Grundkörper der Pleuelstange drehbar gelagert, wobei in dem Grundkörper das jeweils andere Pleuelauge, beispielsweise also das erste Pleuelauge, vorliegt. Die Drehachse, um welche der Exzenter drehbar an dem Grundkör- per gelagert ist, ist von einer Längsmittelachse des in dem Exzenter ausge- bildeten Pleuelauges, insbesondere also des zweiten Pleuelauges, parallel beabstandet angeordnet. The adjusting device is designed as Exzenterverstelleinrichtung and accordingly has in addition to the hydraulic cylinders on the eccentric. In the eccentric one of the connecting rod is formed, preferably the second connecting rod eye. The eccentric is rotatably mounted about a rotation axis rotatably mounted on a base body of the connecting rod, wherein in the base body, the respective other connecting rod, for example, the first connecting rod, is present. The axis of rotation about which the eccentric is rotatably mounted on the base body is arranged at a parallel distance from a longitudinal central axis of the connecting rod eye formed in the eccentric, in particular therefore of the second connecting rod eye.

Der Exzenter ist über das wenigstens eine Zugmittel mit den Hydraulikkolben gekoppelt, welche in den Hydraulikzylindern axial verlagerbar angeordnet sind. Unter der axialen Verlagerbarkeit der Hydraulikkolben ist eine lineare Verlagerbarkeit in Richtung einer Längsmittelachse des Hydraulikzylinders beziehungsweise des Hydraulikkolbens zu verstehen. Die Wirkverbindung zwischen den Hydraulikkolben und dem Exzenter werden über das Zugmittel hergestellt, nämlich derart, dass bei einer Verlagerung der Hydraulikkolben in den Hydraulikzylindern eine Drehbewegung des Exzenters um seine Dreh- achse zum Verstellen des effektiven Abstands zwischen den Mittelpunkten der Pleuelaugen bewirkt wird. The eccentric is coupled via the at least one traction means with the hydraulic piston, which are arranged axially displaceable in the hydraulic cylinders. The axial displaceability of the hydraulic piston means a linear displaceability in the direction of a longitudinal center axis of the hydraulic cylinder or of the hydraulic piston. The operative connection between the hydraulic pistons and the eccentric are produced via the traction means, namely such that upon a displacement of the hydraulic pistons in the hydraulic cylinders a rotational movement of the eccentric about its axis of rotation is effected for adjusting the effective distance between the centers of the connecting rods.

Das Zugmittel ist vorzugsweise derart ausgestaltet, dass es lediglich eine Zugkraft aufnehmen kann, insoweit also biegeschlaff ist. Alternativ kann ein biegesteifes Zugmittel Verwendung finden. Es kann vorgesehen sein, dass lediglich ein einziges Zugmittel vorliegt, welches einerseits an dem ersten Hydraulikkolben und andererseits an dem zweiten Hydraulikkolben angreift und zudem mit dem Exzenter gekoppelt ist. Es kann jedoch auch vorgese- hen sein, dass der erste Hydraulikkolben über ein erstes Zugmittel und der zweite Hydraulikkolben über ein zweites Zugmittel mit dem Exzenter gekop- pelt sind. Das Zugmittel oder die mehreren Zugmittel können den Exzenter - zumindest zeitweise in Abhängigkeit von der Stellung des Exzenters - je- weils nur teilweise, mindestens einmal oder mehrfach umschlingen. In jedem Fall kann durch Druckbeaufschlagung des ersten Hydraulikzylinders oder des zweiten Hydraulikzylinders der Exzenter um seine Drehachse gedreht werden. Bevorzugt ist die Verstelleinrichtung derart ausgebildet, dass bei einer Druckbelastung der Pleuelstange, welche auf die Verkleinerung des effekti ven Abstands zwischen den Mittelpunkten der Pleuelaugen gerichtet ist, der zweite Hydraulikzylinder über das Zugmittel zugbeaufschlagt wird, wohinge- gen bei einer Zugbelastung der Pleuelstange, welche auf die Vergrößerung des effektiven Abstands gerichtet ist, der erste Hydraulikzylinder zugbeauf- schlagt wird. Es kann jedoch auch - je nach Ausgestaltung des Zugmittels - die umgekehrte Vorgehensweise vorgesehen sein. The traction means is preferably designed such that it can absorb only a tensile force, so far as it is limp. Alternatively, a rigid traction means can be used. It can be provided that only a single traction means is present, which acts on the one hand on the first hydraulic piston and on the other hand on the second hydraulic piston and is also coupled to the eccentric. However, it may also be hen that the first hydraulic piston via a first traction means and the second hydraulic piston are coupled via a second traction means with the eccentric. The traction means or the plurality of traction means can each wrap around the eccentric only partially, at least once or several times, at least temporarily as a function of the position of the eccentric. In any case, by applying pressure to the first hydraulic cylinder or the second hydraulic cylinder, the eccentric can be rotated about its axis of rotation. Preferably, the adjusting device is designed such that at a pressure load of the connecting rod, which is directed to the reduction of the effective distance between the center points of the connecting rods, the second hydraulic cylinder is zugbeaufschlagt on the traction means, whereas conditions at a tensile load of the connecting rod, which on the increase of the effective distance is directed, the first hydraulic cylinder is zugbeauf- strike. However, it can also - depending on the configuration of the traction device - be provided the reverse procedure.

Eine derartige Ausgestaltung der Pleuelstange ermöglicht eine platzsparen- de Anordnung der Hydraulikzylinder, weil diese aufgrund der Kopplung der Hydraulikkolben mit dem Exzenter über das, insbesondere biegeschlaffe, Zugmittel optimal angeordnet werden können, beispielsweise zur Erzielung einer gleichmäßigen Gewichtsverteilung der Pleuelstange. Zudem kann ein Überstehen der Hydraulikzylinder über eine Grundgeometrie der Pleuelstan- ge verhindert werden, sodass insgesamt ein geringeres Gewicht der Pleuel- stange realisiert ist. Besonders bevorzugt ist es vorgesehen, dass die Hyd- raulikkolben in den Hydraulikzylindern festgesetzt werden können, sodass eine Verriegelung vorliegt. Beispielsweise wird dies durch eine strömungs- technische Versperrung wenigstens einer der Hydraulikzylinder, bevorzugt beider Hydraulikzylinder, erzielt. Such a design of the connecting rod allows a space-saving arrangement of the hydraulic cylinder, because these can be optimally arranged due to the coupling of the hydraulic piston with the eccentric on the, in particular pliable, traction means, for example, to achieve a uniform weight distribution of the connecting rod. In addition, a protrusion of the hydraulic cylinder can be prevented via a basic geometry of the connecting rod, so that overall a lesser weight of the connecting rod is realized. It is particularly preferably provided that the hydraulic raulikkolben can be fixed in the hydraulic cylinders, so that there is a lock. For example, this is achieved by a fluidic obstruction of at least one of the hydraulic cylinders, preferably both hydraulic cylinders.

Eine Weiterbildung der Erfindung sieht vor, dass Längsmittelachsen der Hyd- raulikzylinder parallel zueinander und/oder symmetrisch bezüglich einer Längsmittelachse der Pleuelstange vorliegen. Aufgrund der parallelen An- Ordnung der Hydraulikzylinder beziehungsweise ihrer Längsmittelachsen kann die vorstehend bereits erwähnte optimale Anordnung realisiert werden, bei welcher die Hydraulikzylinder nicht über die Grundgeometrie der Pleuel- stange überstehen. Zudem wird eine ansonsten auftretende Materialanhäu- fung auf vorteilhafte Art und Weise vermieden. A further development of the invention provides that longitudinal central axes of the hydraulic cylinders are present parallel to one another and / or symmetrically with respect to a longitudinal central axis of the connecting rod. Due to the parallel Order of the hydraulic cylinder or its longitudinal central axes, the above-mentioned optimal arrangement can be realized, in which the hydraulic cylinders do not protrude beyond the basic geometry of the connecting rod. In addition, an otherwise occurring material accumulation is avoided in an advantageous manner.

Zusätzlich oder alternativ können die Hydraulikzylinder beziehungsweise ihre Längsmittelachsen symmetrisch angeordnet sein, nämlich bezüglich der Längsmittelachsen der Pleuelstange. Hierbei ist es beispielsweise vorgese- hen, dass die Hydraulikzylinder beziehungsweise ihre Längsmittelachsen jeweils beabstandet parallel zu der Längsmittelachse der Pleuelstange an- geordnet sind. Unter der Längsmittelachse der Pleuelstange ist vorzugswei- se eine Längsmittelachse des vorstehend bereits erwähnten Grund körpers zu verstehen. Auch eine derartige Anordnung dient der Realisierung einer gleichmäßigen Gewichtsverteilung der Pleuelstange. Additionally or alternatively, the hydraulic cylinders or their longitudinal center axes may be arranged symmetrically, namely with respect to the longitudinal center axes of the connecting rod. In this case, it is provided, for example, that the hydraulic cylinders or their longitudinal center axes are each arranged spaced apart parallel to the longitudinal center axis of the connecting rod. The longitudinal center axis of the connecting rod is preferably to be understood as meaning a longitudinal center axis of the base body already mentioned above. Such an arrangement also serves to realize a uniform weight distribution of the connecting rod.

Eine bevorzugte weitere Ausgestaltung der Erfindung sieht vor, dass die Hydraulikzylinder das gleiche Hydraulikvolumen aufweisen. Das bedeutet, dass bei einer Stellung der in ihnen angeordneten Kolben derart, dass das jeweilige Volumen maximal wird, das Volumen des ersten Hydraulikzylinders dem Volumen des zweiten Hydraulikzylinders entspricht. Hierdurch wird die gleichmäßige Gewichtsverteilung der Pleuelstange erzielt. Alternativ kann es selbstverständlich auch vorgesehen sein, dass die Volumina der Hydrau- likzylinder unterschiedlich sind. A preferred further embodiment of the invention provides that the hydraulic cylinders have the same hydraulic volume. This means that at a position of the piston arranged in them such that the respective volume becomes maximum, the volume of the first hydraulic cylinder corresponds to the volume of the second hydraulic cylinder. As a result, the uniform weight distribution of the connecting rod is achieved. Alternatively, it may of course also be provided that the volumes of the hydraulic cylinders are different.

Im Rahmen einer weiteren Ausgestaltung der Erfindung kann vorgesehen sein, dass das Zugmittel als Seil, Kette oder Riemen vorliegt. Die Kette liegt besonders bevorzugt in Form einer Zahn kette und der Riemen in Form eines Zahnriemens vor. In jedem Fall ist das Zugmittel bevorzugt biegeschlaff aus- gestaltet, also zumindest nicht auf Druck belastbar, sondern vielmehr nur auf Zug belastbar. Die Verwendung des Seils, der Kette oder des Riemens als Zugmittel ermöglicht eine deutliche Gewichtsreduzierung der Pleuelstange im Vergleich mit bekannten Ausgestaltungen. Auch eine biegesteife Ausge- staltung des Zugmittels kann realisiert sein, insbesondere falls es in Gestalt der Kette vorliegt. In the context of a further embodiment of the invention can be provided that the traction means is present as a rope, chain or belt. The chain is particularly preferably in the form of a toothed chain and the belt in the form of a toothed belt before. In any case, the traction means is preferably designed as a limp, so at least not loadable on pressure, but rather only on train loadable. The use of the rope, the chain or the belt as a traction means allows a significant weight reduction of the connecting rod in comparison with known embodiments. Also a rigid version staltung of the traction means can be realized, in particular if it is in the form of the chain.

Eine weitere Ausführungsform der Erfindung sieht vor, dass der Exzenter außenseitig mit einer Verzahnung versehen ist, die mit der Zahn kette oder dem Zahnriemen in Eingriff steht. Der Exzenter ist, wie bereits erläutert, um seine Drehachse drehbar an dem Grundkörper der Pleuelstange gelagert. In radialer Richtung bezüglich der Drehachse außen verfügt er über die Ver- zahnung, welche insoweit auch als Außenverzahnung bezeichnet werden kann. Die Verzahnung kämmt mit der Zahn kette beziehungsweise dem Zahnriemen, steht also mit dieser beziehungsweise diesem in Eingriff. Hier- durch wird eine besonders zuverlässige Kraftübertragung von dem Zugmittel auf den Exzenter bewirkt. Eine weitere Ausführungsform der Erfindung sieht vor, dass das Zugmittel durchgehend und den Exzenter teilweise umgreifend ausgebildet ist, wobei es einerseits an dem ersten Hydraulikkolben und andererseits an dem zwei- ten Hydraulikkolben befestigt ist. Bei einer derartigen Ausgestaltung der Pleuelstange ist lediglich ein einziges Zugmittel vorgesehen, welches sich von dem ersten Hydraulikkolben bis hin zu dem zweiten Hydraulikkolben er streckt und hierbei den Exzenter teilweise umgreift. A further embodiment of the invention provides that the eccentric is provided on the outside with a toothing chain with the tooth or the toothed belt is engaged. The eccentric is, as already explained, mounted rotatably about its axis of rotation on the main body of the connecting rod. In the radial direction with respect to the axis of rotation outside, it has the toothing, which can also be referred to as external toothing. The teeth mesh with the toothed chain or the timing belt, so it is with this or this in engagement. This results in a particularly reliable power transmission from the traction means to the eccentric. A further embodiment of the invention provides that the traction means is formed continuously and the eccentric partially encompassing, wherein it is attached on the one hand to the first hydraulic piston and on the other hand to the second hydraulic piston. In such an embodiment of the connecting rod, only a single traction means is provided, which extends from the first hydraulic piston to the second hydraulic piston he stretches and in this case partially surrounds the eccentric.

In anderen Worten verläuft das Zugmittel ausgehend von dem ersten Hyd- raulikkolben hin zu dem Exzenter und ausgehend von dem Exzenter zu dem Hydraulikkolben. Das Zugmittel ist an den beiden Hydraulikkolben jeweils befestigt und umgreift den Exzenter derart, dass eine mechanische Kopplung zwischen den Hydraulikkolben und dem Exzenter über das Zugmittel herge- stellt ist. Eine derartige Ausgestaltung der Pleuelstange ist besonders ein- fach und kostengünstig zu realisieren. In other words, the traction means extends from the first hydraulic raulikkolben towards the eccentric and from the eccentric to the hydraulic piston. The traction means is respectively attached to the two hydraulic pistons and engages around the eccentric in such a way that a mechanical coupling is produced between the hydraulic pistons and the eccentric via the traction means. Such a design of the connecting rod is particularly simple and inexpensive to implement.

Eine weitere bevorzugte Ausführungsform der Erfindung sieht vor, dass das Zugmittel über eine erste Schubstange an dem ersten Hydraulikkolben und über eine zweite Schubstange an dem zweiten Hydraulikkolben angreift. Die erste Schubstange ist insoweit einerseits an dem ersten Hydraulikkolben und andererseits an dem Zugmittel und die zweite Schubstange einerseits an dem zweiten Hydraulikkolben und andererseits an dem Zugmittel befestigt. Über die Schubstangen ist also eine starre Verbindung zwischen dem Zug- mittel und dem jeweiligen Hydraulikkolben hergestellt. Die Schubstangen sind vorzugsweise jeweils durchgehend gerade ausgebildet. Die Verwen- dung der Schubstangen ermöglicht eine besonders einfache und effiziente Führung des Zugmittels. A further preferred embodiment of the invention provides that the traction means acts on the first hydraulic piston via a first push rod and on the second hydraulic piston via a second push rod. The first push rod is so far on the one hand on the first hydraulic piston and on the other hand attached to the traction means and the second push rod on the one hand to the second hydraulic piston and on the other hand to the traction means. Thus, a rigid connection between the traction means and the respective hydraulic piston is produced via the push rods. The push rods are preferably each formed straight straight. The use of the push rods enables a particularly simple and efficient guidance of the traction means.

Alternativ oder zusätzlich kann vorgesehen sein, dass das Zugmittel an einer zwischen dem ersten Hydraulikkolben und dem Exzenter liegenden ersten Stelle und/oder an einer zwischen dem zweiten Hydraulikkolben und dem Exzenter liegenden zweiten Stelle eine oder jeweils eine Führungseinrich- tung zur Führung des Zugmittels an dem Zugmittel angreift. In anderen Wor- ten kann nur an einer der beiden Stellen die Führungseinrichtung vorliegen oder alternativ mehrere Führungseinrichtungen an der Pleuelstange ange- ordnet sein, wobei die erste Stelle mittels einer ersten der Führungseinrich- tungen und die zweite Stelle mittels einer zweiten der Führungseinrichtungen geführt sind. Alternatively or additionally, it may be provided that the traction means at one lying between the first hydraulic piston and the eccentric first position and / or at a lying between the second hydraulic piston and the eccentric second point or one Führungseinrich- device for guiding the traction means on the Pulling means attacks. In other words, the guide device may be present only at one of the two points, or alternatively a plurality of guide devices may be arranged on the connecting rod, the first point being guided by means of a first one of the guide devices and the second point being guided by a second one of the guide devices.

Zum Führen des Zugmittels greift die Führungseinrichtung beziehungsweise greifen die Führungseinrichtungen an dem Zugmittel an. Beispielsweise er folgt die Führung derart, dass an der ersten Stelle und/oder der zweiten Stel le eine Umlenkung des Zugmittels auftritt. Besonders bevorzugt ist die Füh- rungseinrichtung beziehungsweise sind die Führungseinrichtungen derart ausgestaltet, dass das Zugmittel ausgehend von dem ersten Hydraulikkolben und/oder von dem zweiten Hydraulikkolben bis hin zu der ersten Stelle und/oder der zweiten Stelle gerade oder zumindest nahezu gerade verläuft und besonders bevorzugt mit der Längsmittelachse des jeweiligen Hydrau- likzylinders zusammenfällt. To guide the traction means engages the guide means or engage the guide means on the traction means. For example, it follows the guide such that at the first location and / or the second Stel le deflection of the traction device occurs. Particularly preferably, the guide means or the guide means are configured such that the traction means, starting from the first hydraulic piston and / or from the second hydraulic piston to the first location and / or the second location is straight or at least almost straight and particularly preferred coincides with the longitudinal center axis of the respective hydraulic cylinder.

Dies ermöglicht die Verwendung eines Exzenters, welcher einen größeren Außendurchmesser aufweist als der Abstand zwischen den Hydraulikkolben. Alternativ kann die gerade Ausgestaltung des Zugmittels auch durch eine Ausgestaltung des Exzenters derart erfolgen, dass sein Außendurchmesser dem Abstand zwischen den Hydraulikkolben entspricht. Die Führungseinrich- tung beziehungsweise die Führungseinrichtungen ermöglichen einen zuver- lässigen und verschleißarmen Betrieb der Pleuelstange. This allows the use of an eccentric, which has a larger outer diameter than the distance between the hydraulic piston. Alternatively, the straight configuration of the traction means can also be effected by an embodiment of the eccentric such that its outer diameter corresponds to the distance between the hydraulic piston. The guide device or the guide devices enable a reliable and low-wear operation of the connecting rod.

Es kann vorgesehen sein, dass die Führungseinrichtung eine Führungshülse ist. Die Führungshülse ist an der Pleuelstange beziehungsweise dem Grund- körper der Pleuelstange befestigt und insoweit ortsfest. Die Führungshülse umgreift das Zugmittel wenigstens bereichsweise, insbesondere vollständig, um eine besonders zuverlässige Führung des Zugmittels zu erzielen. Bei- spielsweise ist die Führungshülse derart angeordnet, dass das Zugmittel ausgehend von dem jeweiligen Hydraulikkolben bis hin zu der Führungshül- se gerade verläuft, insbesondere auf der Längsmittelachse des Hydraulikzy- linders beziehungsweise des Hydraulikkolbens und/oder beabstandet parallel von einer Längsmittelachse der Pleuelstange beziehungsweise ihres Grund- körpers. Eine solche Ausgestaltung der Führungseinrichtung ermöglicht den zuverlässigen und verschleißarmen Betrieb der Pleuelstange. It can be provided that the guide device is a guide sleeve. The guide sleeve is fastened to the connecting rod or the base body of the connecting rod and is stationary to that extent. The guide sleeve engages around the traction means at least partially, in particular completely, in order to achieve a particularly reliable guidance of the traction means. For example, the guide sleeve is arranged such that the traction means extends straight from the respective hydraulic piston up to the guide sleeve, in particular on the longitudinal central axis of the hydraulic cylinder or hydraulic piston and / or spaced parallel from a longitudinal center axis of the connecting rod or its Basic body. Such a design of the guide device enables the reliable and low-wear operation of the connecting rod.

Eine Weiterbildung der Erfindung sieht vor, dass das Zugmittel schwenkbe- weglich an den Schubstangen gelagert ist. Vorteilhafterweise ist das Zugmit- tel an jeder der Schubstangen jeweils schwenkbeweglich gelagert. Hierdurch wird ein Verschleiß des Zugmittels minimiert. A development of the invention provides that the traction means is pivotally mounted on the push rods. Advantageously, the Zugmit- tel is mounted pivotably on each of the push rods. As a result, wear of the traction device is minimized.

Schließlich kann im Rahmen einer weiteren bevorzugten Ausgestaltung der Erfindung vorgesehen sein, dass die Schubstangen voneinander einen Ab- stand aufweisen, der kleiner ist als ein Außendurchmesser des Exzenters. Entsprechend wird eine äußerst kompakte und leichte Ausgestaltung der Pleuelstange realisiert. Finally, it can be provided within the scope of a further preferred embodiment of the invention that the push rods have a distance from one another which is smaller than an outer diameter of the eccentric. Accordingly, an extremely compact and lightweight design of the connecting rod is realized.

Die Erfindung betrifft weiterhin eine Brennkraftmaschine, mit einer Pleuel- stange, insbesondere einer Pleuelstange gemäß den Ausführungen im Rahmen dieser Beschreibung, wobei die Pleuelstange über ein erstes Pleu- elauge, in dem ein Hubzapfen einer Kurbelwelle der Brennkraftmaschine um eine Drehachse drehbar gelagert ist, über ein zweites Pleuelauge zur schwenkbeweglichen Anbindung eines Kolbens der Brennkraftmaschine und über eine Verstelleinrichtung zur Verstellung eines effektiven Abstands zwi- schen Mittelpunkten der Pleuelaugen verfügt, wobei die Verstelleinrichtung einen ersten Hydraulikzylinder und einen zweiten Hydraulikzylinder aufweist, die zum Verstellen des effektiven Abstands mittels eines einem der Pleu- elaugen zugeordneten Exzenters mit Hydraulikfluid beaufschlagbar sind. Da- bei ist vorgesehen, dass ein in dem ersten Hydraulikzylinder axial verlager- bar gelagerter erster Hydraulikkolben und ein in dem zweiten Hydraulikzylin- der axial verlagerbar gelagerter zweiter Hydraulikkolben über wenigstens ein Zugmittel mit dem Exzenter gekoppelt sind. The invention further relates to an internal combustion engine, with a connecting rod, in particular a connecting rod according to the statements in this description, wherein the connecting rod via a first Pleu- lohlauge in which a crank pin of a crankshaft of the internal combustion engine is rotatably mounted about a rotational axis over a second connecting rod eye for pivotally connecting a piston of the internal combustion engine and has an adjusting device for adjusting an effective distance between centers of the connecting rod, wherein the adjusting device comprises a first hydraulic cylinder and a second hydraulic cylinder, which can be acted upon for adjusting the effective distance by means of an eccentric associated with one of the Pleu- laugen with hydraulic fluid. It is provided that a first hydraulic piston axially displaceably mounted in the first hydraulic cylinder and a second hydraulic piston axially displaceably mounted in the second hydraulic cylinder are coupled to the eccentric via at least one traction means.

Auf die Vorteile einer derartigen Ausgestaltung der Brennkraftmaschine be- ziehungsweise der Pleuelstange wurde bereits hingewiesen. Sowohl die Brennkraftmaschine als auch die Pleuelstange können gemäß den Ausfüh- rungen im Rahmen dieser Beschreibung weitergebildet sein, sodass insoweit auf diese verwiesen wird. The advantages of such an embodiment of the internal combustion engine or the connecting rod has already been pointed out. Both the internal combustion engine and the connecting rod can be developed according to the embodiments in the context of this description, so that reference is made to this extent.

Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsbeispiele näher erläutert, ohne dass eine Beschränkung der Er findung erfolgt. Dabei zeigt die einzige The invention will be explained in more detail with reference to the embodiments illustrated in the drawings, without any limitation of the invention He made. The only one shows

Figur eine schematische Darstellung einer Pleuelstange für eine Brenn- kraftmaschine, welche eine Verstelleinrichtung zum Verstellen eines effektiven Abstands zwischen zwei Pleuelaugen aufweist. FIG. 1 shows a schematic representation of a connecting rod for an internal combustion engine, which has an adjusting device for adjusting an effective distance between two connecting-rod eyes.

Die Figur 1 zeigt eine schematische Darstellung eines Bereichs einer Brenn- kraftmaschine 1 , nämlich einer Pleuelstange 2. Die Pleuelstange 2 weist ein erstes Pleuelauge 3 und ein zweites Pleuelauge 4 auf. Das erste Pleuelauge 3 umgreift beispielsweise einen hier nicht dargestellten Hubzapfen einer Kurbelwelle der Brennkraftmaschine 1 , sodass eine drehbare Lagerung der Pleuelstange 2 an dem Hubzapfen realisiert ist. Das zweite Pleuelauge 4 liegt an einem dem ersten Pleuelauge 3 gegenüberliegenden Ende der Pleu- elstange 2 vor. Es ist zur sch wen kbeweg liehen Anbindung an einen Kolben der Brennkraftmaschine 1 vorgesehen und ausgebildet. Die Pleuelstange 2 ist als verstellbare Pleuelstange ausgestaltet und weist insoweit eine Verstelleinrichtung 5 auf, mittels welchen der Abstand zwi- schen Mittelpunkten 6 und 7 der Pleuelaugen 3 und 4 einstellbar ist. Die Ver- stelleinrichtung 5 weist in dem hier dargestellten Ausführungsbeispiel einen ersten Hydraulikzylinder 8 und einen zweiten Hydraulikzylinder 9 auf, wobei in dem ersten Hydraulikzylinder 8 ein erster Hydraulikkolben 10 und in dem zweiten Hydraulikzylinder 9 ein zweiter Hydraulikkolben 11 linear verlagerbar angeordnet sind. FIG. 1 shows a schematic representation of a region of an internal combustion engine 1, namely a connecting rod 2. The connecting rod 2 has a first connecting rod eye 3 and a second connecting rod eye 4. The first connecting rod 3 surrounds, for example, a crank pin, not shown here, of a crankshaft of the internal combustion engine 1, so that a rotatable mounting of the connecting rod 2 is realized on the crank pin. The second connecting rod eye 4 is present at an end opposite the first connecting rod eye 3 of the connecting rod 2. It is provided for sch wen kbeweg lent connection to a piston of the internal combustion engine 1 and formed. The connecting rod 2 is designed as an adjustable connecting rod and has insofar an adjusting device 5, by means of which the distance between centers 6 and 7 of the connecting rod 3 and 4 is adjustable. The adjusting device 5 has in the embodiment shown here a first hydraulic cylinder 8 and a second hydraulic cylinder 9, wherein in the first hydraulic cylinder 8, a first hydraulic piston 10 and in the second hydraulic cylinder 9, a second hydraulic piston 11 are arranged linearly displaceable.

An die Hydraulikkolben 10 und 11 schließen sich Schubstangen 12 und 13 an. Diese sind vorzugsweise starr mit dem jeweiligen Hydraulikkolben 10 und 11 verbunden und/oder einstückig sowie materialeinheitlich mit diesen aus- gebildet. An einem dem ersten Hydraulikkolben 10 abgewandten Ende der ersten Schubstange 12 ist ein Zugmittel 14 befestigt, beispielsweise schwenkbeweglich angelenkt. Auf der dem zweiten Hydraulikkolben 11 ab- gewandten Seite der zweiten Schubstange 13 ist das Zugmittel 14 ebenfalls befestigt, insbesondere angelenkt. Das Anlenken des Zugmittels 14 an die Schubstangen 12 und 13 ist beispielsweise mittels Bolzen 15 und 16 reali- siert. The hydraulic pistons 10 and 11 are followed by push rods 12 and 13. These are preferably rigidly connected to the respective hydraulic piston 10 and 11 and / or integrally formed therewith and of the same material. At a first hydraulic piston 10 facing away from the end of the first push rod 12, a traction means 14 is fixed, for example, hinged pivotally. On the side of the second push rod 13 facing away from the second hydraulic piston 11, the traction means 14 is likewise fastened, in particular articulated. The articulation of the traction means 14 to the push rods 12 and 13 is realized, for example, by means of bolts 15 and 16.

Zum Verstellen des effektiven Abstands zwischen den Mittelpunkten 6 und 7 der Pleuelaugen 3 und 4 ist das zweite Pleuelauge 4 in einem Exzenter 17 angeordnet und/oder ausgebildet. Der Exzenter 17 ist um eine von dem Mit telpunkt 7 des zweiten Pleuelauges 4 verschiedene Drehachse drehbar ge- lagert, nämlich an einem Grundkörper 18 der Pleuelstange 2. Der Exzenter 17 weist an seinem Außenumfang eine Verzahnung 19 auf, die mit dem Zugmittel 14 in Eingriff steht, welche hierzu beispielsweise als Zahn kette o- der als Zahnriemen ausgebildet ist. For adjusting the effective distance between the centers 6 and 7 of the connecting rods 3 and 4, the second connecting rod 4 is disposed in an eccentric 17 and / or formed. The eccentric 17 is rotatably superimposed on a pivot point of the center point 7 of the second connecting rod 4 different rotation axis, namely on a base body 18 of the connecting rod 2. The eccentric 17 has on its outer periphery a toothing 19 which engages with the traction means 14 is, which is this example, as a toothed chain o- formed as a toothed belt.

Die Hydraulikzylinder 8 und 9 sind über Hydraulikleitungen 20 und 21 an eine Hydraulikfluidquelle angeschlossen. Insoweit sind die Hydraulikzylinder 8 und 9 über die Hydraulikleitungen 20 und 21 mit Hydraulikfluid beaufschlag- bar beziehungsweise kann ihnen über die Hydraulikfluidleitung 20 und 21 Hydraulikfluid entnommen werden. Eine Verstellung des Exzenters und mit- hin eine Veränderung des effektiven Abstands der Mittelpunkte 6 und 7 der Pleuelaugen 3 und 4 zueinander kann folglich durch eine entsprechende Be- aufschlagung der Hydraulikzylinder 8 und 9 mit Hydraulikfluid vorgenommen werden. The hydraulic cylinders 8 and 9 are connected via hydraulic lines 20 and 21 to a hydraulic fluid source. In that regard, the hydraulic cylinders 8 and 9 can be acted upon with hydraulic fluid via the hydraulic lines 20 and 21 or hydraulic fluid can be withdrawn from them via the hydraulic fluid line 20 and 21. An adjustment of the eccentric and mit- towards a change in the effective distance of the centers 6 and 7 of the connecting rods 3 and 4 to each other can therefore be made by a corresponding loading of the hydraulic cylinders 8 and 9 with hydraulic fluid.

Die hier beschriebene Ausgestaltung der Pleuelstange 2 hat den Vorteil, dass die Hydraulikkolben 10 und 11 parallel zueinander angeordnet sind, sodass eine gleichmäßige Gewichtsverteilung der Pleuelstange 2 bezie- hungsweise zumindest ihres Grundkörpers 18 realisiert ist. Zudem werden über einen Außenumfang des Grundkörpers 18 überstehende Bereiche weit- gehend oder sogar vollständig vermieden, sodass ein äußerst geringes Ge- wicht der Pleuelstange 2 realisiert ist. The embodiment of the connecting rod 2 described here has the advantage that the hydraulic pistons 10 and 11 are arranged parallel to one another, so that a uniform weight distribution of the connecting rod 2 or at least of its main body 18 is realized. In addition, areas projecting beyond an outer circumference of the main body 18 are largely or even completely avoided, so that an extremely low weight of the connecting rod 2 is realized.

Claims

PATENTANSPRÜCHE: CLAIMS: Pleuelstange (2) für eine Brennkraftmaschine (1 ), mit einem ersten Pleuelauge (3), in dem ein Hubzapfen einer Kurbelwelle der Brenn- kraftmaschine (1 ) um eine Drehachse drehbar lagerbar ist, mit einem zweiten Pleuelauge (4) zur schwenkbeweglichen Anbindung eines Kol- bens der Brennkraftmaschine (1 ) und mit einer Verstelleinrichtung (5) zur Verstellung eines effektiven Abstands zwischen Mittelpunkten (6,7) der Pleuelaugen (3,4), wobei die Verstelleinrichtung (5) einen ersten Hydraulikzylinder (8) und einen zweiten Hydraulikzylinder (9) aufweist, die zum Verstellen des effektiven Abstands mittels eines einem der Pleuelaugen (3,4) zugeordneten Exzenters (17) mit Hydraulikfluid be- aufschlagbar sind, dadurch gekennzeichnet, dass ein in dem ersten Hydraulikzylinder (8) axial verlagerbar gelagerter erster Hydraulikkolben (10) und ein in dem zweiten Hydraulikzylinder (9) axial verlagerbar ge- lagerter zweiter Hydraulikkolben (11 ) über wenigstens ein Zugmittel (14) mit dem Exzenter (17) gekoppelt sind. Connecting rod (2) for an internal combustion engine (1), with a first connecting rod eye (3), in which a crankpin of a crankshaft of the internal combustion engine (1) is rotatably mounted about a rotational axis, with a second connecting rod eye (4) for pivotally connecting a Piston of the internal combustion engine (1) and with an adjusting device (5) for adjusting an effective distance between centers (6,7) of the connecting rods (3,4), wherein the adjusting device (5) has a first hydraulic cylinder (8) and a second Hydraulic cylinder (9), which can be supplied with hydraulic fluid for adjusting the effective distance by means of one of the connecting rods (3,4) associated eccentric (17), characterized in that in the first hydraulic cylinder (8) axially displaceably mounted first Hydraulic piston (10) and a second hydraulic piston (11) axially displaceable in the second hydraulic cylinder (9) via at least one traction means (14) with the eccentric (17) are coupled. Pleuelstange nach Anspruch 1 , dadurch gekennzeichnet, dass Längsmittelachsen der Hydraulikzylinder (8,9) parallel zueinander und/oder symmetrisch bezüglich einer Längsmittelachse der Pleuel- stange (2) vorliegen. Connecting rod according to claim 1, characterized in that longitudinal central axes of the hydraulic cylinders (8,9) parallel to each other and / or symmetrically with respect to a longitudinal central axis of the connecting rod (2) are present. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Hydraulikzylinder (8,9) das gleiche Hydrau- likvolumen aufweisen. Connecting rod according to one of the preceding claims, characterized in that the hydraulic cylinders (8, 9) have the same hydraulic volume. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Zugmittel (14) als Seil, Kette oder Riemen vorliegt. Connecting rod according to one of the preceding claims, characterized in that the traction means (14) is present as a rope, chain or belt. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Exzenter (17) außenseitig mit einer Verzah- nung (19) versehen ist, die mit der Zahn kette oder dem Zahnriemen in Eingriff steht. Connecting rod according to one of the preceding claims, characterized in that the eccentric (17) on the outside with a Verzah tion (19) is provided, which is in mesh with the toothed chain or the toothed belt. 6. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Zugmittel (14) durchgehend und den Ex- zenter (17) teilweise umgreifend ausgebildet ist, wobei es einerseits an dem ersten Hydraulikkolben (10) und andererseits an dem zweiten Hyd- raulikkolben (1 1 ) befestigt ist. 6. Connecting rod according to one of the preceding claims, characterized in that the traction means (14) is formed continuously and the eccentric (17) partially encompassing, wherein it on the one hand on the first hydraulic piston (10) and on the other hand on the second hydraulic raulikkolben (1 1) is attached. 7. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Zugmittel (14) über eine erste Schubstange (12) an dem ersten Hydraulikkolben (10) und über eine zweite Schubstange (13) an dem zweiten Hydraulikkolben (1 1 ) angreift. 7. Connecting rod according to one of the preceding claims, characterized in that the traction means (14) via a first push rod (12) on the first hydraulic piston (10) and via a second push rod (13) on the second hydraulic piston (1 1) engages. 8. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Zugmittel (14) schwenkbeweglich an den Schubstangen (12,13) gelagert ist. 8. Connecting rod according to one of the preceding claims, characterized in that the traction means (14) is pivotally mounted on the push rods (12,13). 9. Pleuelstange nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schubstangen (12,13) voneinander einen Abstand aufweisen, der kleiner ist als ein Außendurchmesser des Ex- zenters (17). 9. Connecting rod according to one of the preceding claims, characterized in that the push rods (12,13) from each other have a distance which is smaller than an outer diameter of the eccentric (17). 10. Brennkraftmaschine (1 ), mit einer Pleuelstange (2), insbesondere einer Pleuelstange (2) nach einem oder mehreren der vorhergehenden An- sprüche, wobei die Pleuelstange (2) über ein erstes Pleuelauge (3), in dem ein Hubzapfen einer Kurbelwelle der Brennkraftmaschine (1 ) um eine Drehachse drehbar gelagert ist, über ein zweites Pleuelauge (4) zur schwenkbeweglichen Anbindung eines Kolbens der Brennkraftma- schine (1 ) und über eine Verstelleinrichtung (5) zur Verstellung eines ef fektiven Abstands zwischen Mittelpunkten (6,7) der Pleuelaugen (3,4) verfügt, wobei die Verstelleinrichtung einen ersten Hydraulikzylinder (8) und einen zweiten Hydraulikzylinder (9) aufweist, die zum Verstellen des effektiven Abstands mittels eines einem der Pleuelaugen (3,4) zu- geordneten Exzenters (17) mit Hydraulikfluid beaufschlagbar sind, dadurch gekennzeichnet, dass ein in dem ersten Hydraulikzylinder (8) axial verlagerbar gelagerter erster Hydraulikkolben (10) und ein in dem zweiten Hydraulikzylinder (9) axial verlagerbar gelagerter zweiter Hyd- raulikkolben (11 ) über wenigstens ein Zugmittel (14) mit dem Exzenter10. internal combustion engine (1), with a connecting rod (2), in particular a connecting rod (2) according to one or more of the preceding claims, wherein the connecting rod (2) via a first connecting rod eye (3), in which a crankpin of a crankshaft the internal combustion engine (1) is rotatably mounted about a rotation axis, via a second connecting rod eye (4) for pivotally connecting a piston of the internal combustion engine (1) and via an adjusting device (5) for adjusting a ef fective distance between centers (6,7 ) of the connecting-rod eyes (3, 4), wherein the adjusting device has a first hydraulic cylinder (8) and a second hydraulic cylinder (9) which are adapted to adjust the effective distance by means of a connecting rod (3, 4). ordered eccentric (17) are acted upon by hydraulic fluid, characterized in that in the first hydraulic cylinder (8) axially displaceably mounted first hydraulic piston (10) and in the second hydraulic cylinder (9) axially displaceably mounted second hydraulic raulikkolben (11) via at least one traction means (14) with the eccentric (17) gekoppelt sind. (17) are coupled.
PCT/EP2019/050685 2018-02-08 2019-01-11 Connecting rod for an internal combustion engine and corresponding internal combustion engine Ceased WO2019154585A1 (en)

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Citations (3)

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WO2014009041A1 (en) * 2012-07-13 2014-01-16 Robert Bosch Gmbh Connecting rod assembly for a cylinder of an internal combustion engine
DE102013225063A1 (en) 2013-12-06 2015-06-11 Hochschule Heilbronn Technik, Wirtschaft, Informatik Connecting rod of an internal combustion engine with variable length
DE102014101929A1 (en) 2014-02-17 2015-09-03 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Connecting rod and internal combustion engine

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US20060243227A1 (en) 2005-04-28 2006-11-02 Greve Christopher G Variable-compression engine
EP2620614B1 (en) 2012-01-24 2016-11-09 Gomecsys B.V. A reciprocating piston mechanism
US8794200B2 (en) 2012-11-21 2014-08-05 GM Global Technology Operations LLC Engine assembly with phasing mechanism on eccentric shaft for variable cycle engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014009041A1 (en) * 2012-07-13 2014-01-16 Robert Bosch Gmbh Connecting rod assembly for a cylinder of an internal combustion engine
DE102013225063A1 (en) 2013-12-06 2015-06-11 Hochschule Heilbronn Technik, Wirtschaft, Informatik Connecting rod of an internal combustion engine with variable length
DE102014101929A1 (en) 2014-02-17 2015-09-03 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Connecting rod and internal combustion engine

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