EP3502436B1 - Bielle pour un moteur à combustion interne à compression variable dotée d'une soupape d'inversion - Google Patents

Bielle pour un moteur à combustion interne à compression variable dotée d'une soupape d'inversion Download PDF

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Publication number
EP3502436B1
EP3502436B1 EP19150637.7A EP19150637A EP3502436B1 EP 3502436 B1 EP3502436 B1 EP 3502436B1 EP 19150637 A EP19150637 A EP 19150637A EP 3502436 B1 EP3502436 B1 EP 3502436B1
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EP
European Patent Office
Prior art keywords
connecting rod
valve
valve housing
bores
switchover
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.)
Active
Application number
EP19150637.7A
Other languages
German (de)
English (en)
Other versions
EP3502436A1 (fr
Inventor
Dietmar Schulze
Alexander MUDRA
Christian Jung
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.)
Eco Holding 1 GmbH
Original Assignee
Eco Holding 1 GmbH
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
Priority claimed from DE102018107108.6A external-priority patent/DE102018107108A1/de
Application filed by Eco Holding 1 GmbH filed Critical Eco Holding 1 GmbH
Publication of EP3502436A1 publication Critical patent/EP3502436A1/fr
Application granted granted Critical
Publication of EP3502436B1 publication Critical patent/EP3502436B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the invention relates to a connecting rod with a switching valve for controlling a hydraulic fluid flow.
  • a high compression ratio has a positive effect on the efficiency of the internal combustion engine.
  • the compression ratio is generally understood to mean the ratio of the entire cylinder space before compression to the remaining cylinder space after compression.
  • the compression ratio may only be selected so high that so-called "knocking" of the internal combustion engine is avoided when operating at full load.
  • the compression ratio could be selected with higher values without "knocking" occurring.
  • the important partial load range of an internal combustion engine can be improved if the compression ratio can be set variably.
  • systems with a variable connecting rod length are known which actuate an eccentric adjusting device of a connecting rod with the aid of hydraulically or mechanically actuated switchover valves.
  • a connecting rod of the generic type is, for example, from DE 10 2012 112 461 A1 refer to.
  • a pick-up element of the switchover element described therein can be locked in two switching positions by means of a locking ball and a spring, the locking ball cooperating with two locking grooves formed in the pick-up element.
  • the construction of the known switchover valve is viewed as complex and therefore costly.
  • a connecting rod for an internal combustion engine with variable compression is proposed, with an eccentric adjusting device in the connecting rod cover for adjusting an effective connecting rod length.
  • An adjustment path of the eccentric adjustment device can be adjusted by means of a switchover valve.
  • a valve housing of the changeover valve is provided axially secured in a bore of the connecting rod by means of one or more securing elements.
  • the inventive securing of the switching valve by means of one or more securing elements axially in a bore of the connecting rod has proven to be advantageous compared to the prior art, in which it is customary to press a changeover valve into a bore in the connecting rod that is made parallel to the connecting rod eyes.
  • the interference fit seals external grooves and bores on the switching valve from one another and prevents a hydraulic short circuit.
  • the interference fit secures the changeover valve against falling out in the axial direction.
  • the interference fit must be designed in such a way that there is always a sufficiently large press-in force with all tolerances, the press-in force being approximately equal to the press-out force, and the material load limits not being exceeded. The maximum press-in force is also reduced by the material stress during operation. It is best to mount the switchover valve in an area with low loads, such as above connecting rod bolts, but this is not always possible due to the engine geometry.
  • the changeover valve can be arranged, for example, centrally below the connecting rod in the connecting rod cover. Tensile forces cause severe deformations at this point, which can also deform the hole for the switchover valve into an oval shape. Press-in forces that are too high could lead to material fatigue and thus cause plastic deformations that weaken the interference fit over its service life. In the worst case, the changeover valve can break or the changeover valve can fall out of the bore. In both cases, engine damage would be the result. Another negative effect if the combined load is too great could be that the deformation jams the pick-up element, which is guided very closely because of the low leakage, and higher loads occur in the switching process.
  • a transition fit or a very small interference fit can therefore be used in combination with a form fit between the valve housing and the connecting rod.
  • a transition fit it is advantageous if play, and thus leakage, is possible between the valve housing and the connecting rod. This can be kept as low as possible, but can be beneficial due to the Leakage points from the tapping element to the valve housing have a relatively minor influence on the system behavior.
  • a locking pin can advantageously be pressed together as a securing element through the connecting rod cover and the valve housing.
  • the connecting rod and the valve housing can have bores into which one or more locking pins are provided as locking elements pressed.
  • the pressing in of one or more locking pins as locking elements preferably transversely to a pressing-in direction of the switchover valve, can ensure in a favorable manner that the switchover valve is secured against falling out of the connecting rod cover.
  • the switchover valve can be designed as described above and preferably inserted in the connecting rod cover without a seal.
  • the interference fit can seal external grooves and bores on the changeover valve with one another and prevent a hydraulic short circuit.
  • the installation in the interference fit means that an additional seal is not required.
  • the locking pin is also provided as a locking pin to axially secure the switch valve in the connecting rod.
  • a bore can be provided in the connecting rod cover for mounting the latching element in the valve housing of the switchover valve. This allows the locking element through the hole in the connecting rod cover in a simple manner Way to be mounted in the valve housing or the tapping element of the switching valve.
  • the bores can be provided as blind bores, which is advantageous with regard to residual dirt.
  • the press-in process can be simplified in that the press-in process can take place in blocks and no longer has to be monitored with regard to the path.
  • the bores can have a clearance fit, in which the one or more locking pins can be secured against falling out by reshaping.
  • Reshaping can take place, for example, by flanging the ends of the locking pins or similar suitable processes.
  • FIGS 2 to 12 show different views and sections of a first example of a switchover valve 11, or of individual parts of the switchover valve 11 of a non-inventive, in Figure 1 connecting rod shown 1.
  • the connecting rod 1 shown has a connecting rod 34, comprising a connecting rod body 29 and a connecting rod cover 30, and an adjustable eccentric adjusting device 6 arranged at least in sections in a connecting rod bearing eye 2 an eccentric 10.
  • the eccentric adjusting device 6 is used to adjust an effective connecting rod length.
  • the distance between a central axis of a pin bearing eye 3 and a central axis of the connecting rod eye 2 is defined as the connecting rod length.
  • a rotation of the adjustable eccentric adjusting device 6 is initiated by the action of inertia and load forces of the internal combustion engine, which act on the eccentric adjusting device 6 during a working cycle of the internal combustion engine.
  • the rotary movement or adjustment movement is supported by pistons 4, 5 that are loaded with hydraulic fluid, in particular with engine oil, and are integrated in the connecting rod 1.
  • the pistons 4, 5 prevent the eccentric adjusting device 6 from being reset due to varying directions of force action of the forces acting on the eccentric adjusting device 6.
  • the pistons 4, 5 are operatively connected to a lever 9 of the eccentric adjusting device 6 on both sides by means of eccentric rods 7, 8.
  • the pistons 4, 5 are arranged displaceably in hydraulic chambers and acted upon by hydraulic fluid via hydraulic fluid lines (not shown) via non-return valves (not shown).
  • the check valves prevent the hydraulic fluid from flowing back from the hydraulic chambers back into the hydraulic fluid lines and enable hydraulic fluid to be sucked into the hydraulic chambers.
  • the check valves can advantageously be integrated into the switchover valve 11, for example as ball or plate check valves or as band check valves. When designed as a band check valve, for example, a position lock such as a bolt or the like. be provided.
  • the hydraulic fluid lines connected to the hydraulic chambers all or at least partially interact with the switchover valve 11.
  • first switching position S1 of the switchover valve 11 which corresponds to a high compression position of the connecting rod 1 (shown in FIG Figure 1 )
  • the first hydraulic chamber is with a relief line, not shown
  • second switching position S2 of the switchover valve 11 which corresponds to a low compression position of the connecting rod 1
  • the second hydraulic chamber is connected to the relief line.
  • the relief line represents the connection to a supply of the connecting rod 1 with hydraulic fluid, for example via a groove in the pin bearing eye 3 of the connecting rod 1.
  • the switchover valve 11 described in more detail below can also be provided for any other connecting rod for an internal combustion engine with variable compression, which has an eccentric adjusting device for adjusting an effective connecting rod length and at least one hydraulic chamber.
  • the eccentric adjusting device of the connecting rod can be designed with a so-called swivel motor system.
  • the switching valve 11 is in Figure 2 shown in an enlarged detail Z of the connecting rod 1 in a cross section.
  • Figure 3 shows a plan view of the switchover valve 11 with the sectional planes AA and BB shown.
  • FIG. 4 shows a longitudinal section through the changeover valve 11 in the sectional plane AA, while Figure 5 represents a longitudinal section in the cutting plane BB.
  • the switching valve 11 is arranged axially in a bore 23 of the connecting rod 1, for example, pressed.
  • the valve housing 12 of the switching valve 11 can be provided axially secured in the bore 23 of the connecting rod 1 by means of one or more locking pins.
  • the one or more locking pins are in the cut in Figure 2 not to be taken, because the locking pin is arranged in a different cutting plane.
  • the connecting rod 1 has bores 32, which in the second exemplary embodiment are shown in FIG Figure 14 can be seen, while the valve housing 12 has corresponding bores 27 (in Figure 9 shown), in which a locking pin can be provided pressed.
  • the bores 32 of the connecting rod 1 are designed, for example, as through bores for easy production.
  • valve housing 12 of the changeover valve which is pressed into the bore 23 of the connecting rod cover 30, with the pick-off element 13 guided in the interior can be seen.
  • the locking pin 18 is arranged in the bores 20, 21 transversely to the axis of the valve housing 12.
  • the switchover valve 11 has a pick-off element 13 which is arranged in a valve housing 12 and which extends in an axial direction L (see FIG Figure 4 ) can be shifted optionally into a first switching position S1 or a second switching position S2 and can be locked in the first or the second switching position S1, S2 by means of a spring-loaded latching element 14.
  • the latching element 14 has a spring element 15 arranged in a latching sleeve 33.
  • a first hydraulic connection 22 of the switchover valve 11 is connected to a relief connection 26 and in the second switching position S2 a second hydraulic connection 24 is connected to the relief connection 26, in particular Figure 4 can be found.
  • the pick-off element 13 arranged in the valve housing 12 can optionally be locked in the first switch position S1 or the second switch position S2.
  • the latching element 14 and the spring element 15 arranged in the latching element 14 are at least partially arranged in a transverse recess 16 of the pick-off element 13.
  • the valve housing 12 has this in the axial Direction L has an axially delimited first groove 17, in which the latching element 14 to limit the switching path and to prevent rotation of the pick-off element 13 is arranged axially displaceably.
  • the at least partial arrangement of the latching element 14 in the recess 16 is advantageous since the guide length of the movable latching element 14 can be significantly increased in comparison to the known switchover valves. The tendency to tilt and self-locking can be reduced and safe reaching of the end positions can be improved by one's own strength.
  • the spring design of the spring element 15 is not critical because of the greater installation length compared to the prior art.
  • the latching element 14 also serves as a stop element which limits a displacement path of the pick-up element 13 in the valve housing 12. This means that the stop element can be omitted as an additional component.
  • the latching element 14 is provided axially displaceably together with the tapping element 13.
  • the latching element 14 interacts with a latching pin 18 which is arranged in the valve housing 12 in the area of the first groove 17.
  • the latching element 14 In order to lock the switchover valve 11 in the two switching positions S1 and S2, the latching element 14 has a latching contour 19 which, in interaction with the latching pin 18, enables two latching positions for the latching element 14. As Figure 4 As can be seen, when the pick-up element 13 is axially displaced, the latching element 14 can latch with its latching contour 19 on both sides of the latching pin 18.
  • FIG. 6 shows an isometric view of the switching valve 11 according to FIG Figure 3 while in the Figures 7, 8, 9 various side views of the switching valve 11 are shown.
  • Figure 9 A sectional plane CC is drawn in, the cross section of which of the switching valve 11 in FIG Figure 10 is shown.
  • Figure 11 shows a further isometric illustration of the switching valve 11 and Figure 12 a plan view of the switching valve 11.
  • valve housing 12 has bores 20, 21 in the region of the first groove 17, into which the latching pin 18 is intended to be pressed.
  • the relief connection 26 can also be seen.
  • FIG. 7 shows the arrangement of the two hydraulic connections 22, 24 while Figure 8 shows the relief connection 26 as an elongated hole.
  • the connecting rod 1 has bores 32, as in the exemplary embodiment in FIG Figure 14 shown, while the valve housing 12 has corresponding holes 27 (in Figure 9 shown), in which a locking pin can be provided pressed.
  • the bores 32 of the connecting rod 1 are designed, for example, as through bores for easy production.
  • a hole in the connecting rod 1 could alternatively be designed as a blind hole, whereby residual dirt can advantageously be avoided.
  • the press-in process can be simplified in that the press-in process no longer has to be monitored with regard to the path.
  • FIG. 13 to 17 an embodiment of a connecting rod 1 according to the invention can be seen, which differs in that the latching pin 18 also serves as a locking pin.
  • the locking pin 18 as a locking pin is provided as an axial lock for the switchover valve 11 in the connecting rod 1.
  • Figure 13 shows a longitudinal section through the connecting rod 1, while in Figure 14 an enlarged detail Z of the longitudinal section according to Figure 13 with focus on the switching valve 11 is shown in a cross section.
  • Figure 15 shows an isometric view of the switching valve 11 according to FIG Figure 13 .
  • Figure 16 is a plan view of the switching valve 11 with the Section plane AA shown while Figure 17 shows a longitudinal section through the switching valve 11 in the section plane AA.
  • the locking pin 18 is pressed through the connecting rod cover 30 and the valve housing 12.
  • a bore 32 preferably a through bore, is provided in the connecting rod cover 30, through which the locking pin 18 can be inserted as a securing element and through bores 20, 21 in the valve housing 12.
  • the locking pin 18 can protrude on both sides over the valve housing 12 so that it is anchored as a securing element in the bore 32 of the connecting rod cover 30.
  • the bores 32 can also be provided as blind bores.
  • the bores 32 can advantageously have a clearance fit in which the one or more locking pins are secured against falling out by reshaping the ends, for example by flanging.
  • the locking pin 18 is mounted after the valve housing 12 has been pressed into the bore 23 in the connecting rod cap 30.
  • at least one bore 31 is expediently made through which the locking element 14 can be introduced into the valve housing 12.
  • an elongated slot is conceivable.
  • the temporary locking pin can have an interference fit, a transition fit or a clearance fit.
  • the locking pin 18 which is longer than in the previous exemplary embodiment, can be seen, which crosses the groove 17 of the valve housing 12 and projects beyond the valve housing 12 on both sides.
  • the relief connection 26 can also be seen.
  • the length of the locking pin 18 is also shown in the top view in FIG Figure 16 refer to.
  • FIG 17 shows in longitudinal section the switchover valve, which essentially corresponds to the illustration of the first example in Figure 4 equals. The difference is that no additional bores 27 are necessary for attaching an additional locking pin, so that the manufacture of the valve housing 12 can be simplified.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Multiple-Way Valves (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Claims (6)

  1. Bielle (1) pour un moteur à combustion interne à compression variable, comprenant un dispositif de réglage à excentrique (6) dans le corps de bielle (29) pour régler une longueur effective de la tige de bielle, une course de réglage du dispositif de réglage à excentrique (6) pouvant être réglée au moyen d'une soupape de commutation (11), un boîtier de soupape (12) de la soupape de commutation (11) étant prévu de manière fixée axialement dans un alésage (23) de la bielle (1) au moyen d'un ou plusieurs éléments de fixation et la soupape de commutation (11) présentant un élément d'engagement (13) disposé dans le boîtier de soupape (12), qui peut être déplacé de manière sélective dans une première position de commutation (S1) ou une deuxième position de commutation (S2) et qui peut être bloqué de manière sélective dans la première ou dans la deuxième position de commutation (S1, S2), caractérisée en ce que la soupape de commutation (13) peut être bloquée de manière sélective dans la première ou dans la deuxième position de commutation (S1, S2) au moyen d'un élément d'encliquetage (14) sollicité par un élément de ressort, l'élément d'encliquetage (14), disposé au moins en partie dans un évidement (16) de l'élément d'engagement (13), pouvant être déplacé avec l'élément d'engagement (13) dans une direction axiale (L) dans une rainure limitée axialement (17) du boîtier de soupape (12) et coopérant avec une goupille d'encliquetage (18), la goupille d'encliquetage en tant que broche de fixation étant prévue en outre en tant que fixation axiale de la soupape de commutation (11).
  2. Bielle (1) selon la revendication 1, la bielle (1) et le boîtier de soupape (12) présentant des alésages (32, 27), dans lesquels la broche de fixation est prévue pour être enfoncée.
  3. Bielle (1) selon la revendication 1 ou 2, dans laquelle la soupape de commutation (11) est insérée de manière non étanche dans le chapeau de bielle (30).
  4. Bielle (1) selon la revendication 1, dans laquelle un alésage (31) dans le chapeau de bielle (30) est prévu pour le montage de l'élément d'encliquetage (14) dans le boîtier de soupape (12) de la soupape de commutation (11).
  5. Bielle (1) selon l'une quelconque des revendications précédentes 2 à 4, dans laquelle les alésages (32) sont prévus sous forme d'alésages borgnes.
  6. Bielle (1) selon l'une quelconque des revendications précédentes 2 à 5, dans laquelle les alésages (32) présentent un ajustement avec jeu dans lequel la broche de fixation est fixée par déformation pour l'empêcher de tomber.
EP19150637.7A 2017-09-04 2018-08-21 Bielle pour un moteur à combustion interne à compression variable dotée d'une soupape d'inversion Active EP3502436B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017120255 2017-09-04
DE102018107108.6A DE102018107108A1 (de) 2017-09-04 2018-03-26 Umschaltventil zum Steuern eines Hydraulikflüssigkeitsstroms und Pleuel für eine Brennkraftmaschine mit variabler Verdichtung mit einem Umschaltventil
EP18189918.8A EP3450720A3 (fr) 2017-09-04 2018-08-21 Soupape d'inversion destinée à commander un circuit de fluide hydraulique et bielle pour un moteur à combustion interne à compression variable avec une soupape d'inversion

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP18189918.8A Division EP3450720A3 (fr) 2017-09-04 2018-08-21 Soupape d'inversion destinée à commander un circuit de fluide hydraulique et bielle pour un moteur à combustion interne à compression variable avec une soupape d'inversion
EP18189918.8A Division-Into EP3450720A3 (fr) 2017-09-04 2018-08-21 Soupape d'inversion destinée à commander un circuit de fluide hydraulique et bielle pour un moteur à combustion interne à compression variable avec une soupape d'inversion

Publications (2)

Publication Number Publication Date
EP3502436A1 EP3502436A1 (fr) 2019-06-26
EP3502436B1 true EP3502436B1 (fr) 2020-11-04

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ID=63350398

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19150637.7A Active EP3502436B1 (fr) 2017-09-04 2018-08-21 Bielle pour un moteur à combustion interne à compression variable dotée d'une soupape d'inversion
EP18189918.8A Withdrawn EP3450720A3 (fr) 2017-09-04 2018-08-21 Soupape d'inversion destinée à commander un circuit de fluide hydraulique et bielle pour un moteur à combustion interne à compression variable avec une soupape d'inversion

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP18189918.8A Withdrawn EP3450720A3 (fr) 2017-09-04 2018-08-21 Soupape d'inversion destinée à commander un circuit de fluide hydraulique et bielle pour un moteur à combustion interne à compression variable avec une soupape d'inversion

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EP (2) EP3502436B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019121107A1 (de) * 2019-08-05 2021-02-11 ECO Holding 1 GmbH Pleuel für eine Brennkraftmaschine mit variabler Verdichtung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012112461A1 (de) 2012-12-18 2014-06-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor mit einem derartigen Umschaltventil
DE102013206513B4 (de) * 2013-04-12 2024-06-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor mit einem solchen Umschaltventil
DE102013105389B4 (de) * 2013-05-27 2021-12-23 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Umschaltventil und Verbrennungsmotor mit einem solchen Umschaltventil
DE102015100662A1 (de) * 2014-12-19 2016-06-23 Hilite Germany Gmbh Hydraulikventil zum Schalten eines Stellkolbens eines Pleuels
DE102015202065A1 (de) * 2015-02-05 2016-08-11 Schaeffler Technologies AG & Co. KG Umschaltventil mit Rücksetzfunktion für einen Verbrennungsmotor
DE102015202051A1 (de) * 2015-02-05 2016-08-11 Schaeffler Technologies AG & Co. KG Umschaltventil
DE102015202056A1 (de) * 2015-02-05 2016-08-11 Schaeffler Technologies AG & Co. KG Ventilgehäuse für ein bivalentes Schaltventil
DE102015203378A1 (de) * 2015-02-25 2016-08-25 Fev Gmbh Verbrennungskraftmaschine mit einstellbarem variablen Verdichtungsverhältnis und einem Schaltmodul
DE102015203417B4 (de) * 2015-02-26 2016-09-15 Schaeffler Technologies AG & Co. KG Schaltventil
DE102015111175A1 (de) * 2015-03-26 2016-09-29 Hilite Germany Gmbh Hydraulikventil und Pleuel mit einem Hydraulikventil

Non-Patent Citations (1)

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Title
None *

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Publication number Publication date
EP3502436A1 (fr) 2019-06-26
EP3450720A3 (fr) 2019-04-24
EP3450720A2 (fr) 2019-03-06

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