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WO2019154585A1 - Bielle pour un moteur à combustion interne ainsi que moteur à combustion interne correspondant - Google Patents

Bielle pour un moteur à combustion interne ainsi que moteur à combustion interne correspondant 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)
English (en)
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/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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

L'invention concerne une bielle (2) pour un moteur à combustion interne (1), comprenant un premier œillet de bielle (3) dans lequel un maneton d'un vilebrequin du moteur à combustion interne (1) peut être monté à rotation autour d'un axe de rotation, comprenant un deuxième œillet de bielle (4) servant à l'attache avec mobilité en pivotement d'un piston du moteur à combustion interne (1) et comprenant un dispositif de réglage (5) destiné au réglage d'un écart effectif entre les points centraux (6, 7) des œillets de bielle (3, 4). Le dispositif de réglage (5) possède un premier vérin hydraulique (8) et un deuxième vérin hydraulique (9) qui peuvent être chargés avec un fluide hydraulique en vue du réglage de l'écart effectif au moyen d'un excentrique (17) associé aux œillets de bielle (3, 4). Selon l'invention, un premier piston hydraulique (10) monté positionnable axialement dans le premier vérin hydraulique (8) et un deuxième piston hydraulique (11) monté positionnable axialement dans le deuxième vérin hydraulique (9) sont accouplés à l'excentrique (17) par le biais d'au moins un moyen de traction (14). L'invention concerne également un moteur à combustion interne (1).
PCT/EP2019/050685 2018-02-08 2019-01-11 Bielle pour un moteur à combustion interne ainsi que moteur à combustion interne correspondant Ceased WO2019154585A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018201988.6A DE102018201988B3 (de) 2018-02-08 2018-02-08 Pleuelstange für eine Brennkraftmaschine sowie entsprechende Brennkraftmaschine
DE102018201988.6 2018-02-08

Publications (1)

Publication Number Publication Date
WO2019154585A1 true WO2019154585A1 (fr) 2019-08-15

Family

ID=65013712

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/050685 Ceased WO2019154585A1 (fr) 2018-02-08 2019-01-11 Bielle pour un moteur à combustion interne ainsi que moteur à combustion interne correspondant

Country Status (2)

Country Link
DE (1) DE102018201988B3 (fr)
WO (1) WO2019154585A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014009041A1 (fr) * 2012-07-13 2014-01-16 Robert Bosch Gmbh Ensemble bielle pour cylindre de moteur à combustion interne
DE102013225063A1 (de) 2013-12-06 2015-06-11 Hochschule Heilbronn Technik, Wirtschaft, Informatik Pleuelstange einer Brennkraftmaschine mit variabler Länge
DE102014101929A1 (de) 2014-02-17 2015-09-03 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Pleuelstange und Verbrennungsmotor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060243227A1 (en) 2005-04-28 2006-11-02 Greve Christopher G Variable-compression engine
EP2620614B1 (fr) 2012-01-24 2016-11-09 Gomecsys B.V. Mécanisme réciproque de piston
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 (fr) * 2012-07-13 2014-01-16 Robert Bosch Gmbh Ensemble bielle pour cylindre de moteur à combustion interne
DE102013225063A1 (de) 2013-12-06 2015-06-11 Hochschule Heilbronn Technik, Wirtschaft, Informatik Pleuelstange einer Brennkraftmaschine mit variabler Länge
DE102014101929A1 (de) 2014-02-17 2015-09-03 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Pleuelstange und Verbrennungsmotor

Also Published As

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DE102018201988B3 (de) 2019-05-29

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