EP2851525B1 - Dispositif et procédé d'actionnement d'au moins une soupape d'échappement d'un moteur à combustion interne commandé par soupape - Google Patents

Dispositif et procédé d'actionnement d'au moins une soupape d'échappement d'un moteur à combustion interne commandé par soupape Download PDF

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Publication number
EP2851525B1
EP2851525B1 EP14001704.7A EP14001704A EP2851525B1 EP 2851525 B1 EP2851525 B1 EP 2851525B1 EP 14001704 A EP14001704 A EP 14001704A EP 2851525 B1 EP2851525 B1 EP 2851525B1
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EP
European Patent Office
Prior art keywords
valve
cam
actuation element
fixing device
piston
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Active
Application number
EP14001704.7A
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German (de)
English (en)
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EP2851525A1 (fr
Inventor
Rainer Kalass
Robert Wiemann
Heribert Möller
Georg Maget
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.)
MAN Truck and Bus SE
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MAN Truck and Bus SE
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Publication date
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Publication of EP2851525A1 publication Critical patent/EP2851525A1/fr
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20Adjusting or compensating clearance
    • F01L1/22Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2416Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device attached to an articulated rocker
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/06Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
    • F01L13/065Compression release engine retarders of the "Jacobs Manufacturing" type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • F01L2001/186Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison

Definitions

  • the present invention relates to a device for actuating at least one exhaust valve of a valve-controlled internal combustion engine for motor vehicles according to the preamble of patent claim 1 and to a method for actuating at least one exhaust valve of a valve-controlled internal combustion engine according to the preamble of claim 11.
  • the problem may be in such devices, the HVA element in engine braking operation, because here by indifferent movements and by occurring valve jump, due to the back pressure, possibly a "pumping" of the HVA element can occur, in which a safe closing of the exhaust valve in the fired operation the internal combustion engine is not guaranteed immediately.
  • the object of the invention is therefore to develop the generic device and a generic method with structurally simple means such that both in regular operation and in engine braking operation or EVB a functionally reliable and trouble-free valve train can be achieved.
  • an apparatus for actuating at least one exhaust valve of a valve-controlled internal combustion engine for motor vehicles is proposed, with a camshaft driven actuator, which is preferably formed by a camshaft driven rocker arm.
  • a first piston-cylinder unit preferably a hydraulically acted piston-cylinder unit, powered by the at least one exhaust valve in an engine braking operation with exhaust gas backlog in a non-closed intermediate position preserved is.
  • a second piston-cylinder unit is provided, which is designed as a valve clearance compensation element (HVA), preferably as a hydraulic valve clearance compensation element (HVA).
  • HVA valve clearance compensation element
  • At least one fixing device for fixing, in particular for stepless fixing, of the actuating element is provided in the force flow between the cam and the outlet valve, wherein the fixing device is designed and / or controlled by a control device, for example, in the engine braking mode when passing through the cam base circle the cam is activated and accordingly the actuating element is fixed in position and that it is deactivated in the engine braking operation when passing through the cam portion of the cam and, accordingly, the positional fixation of the actuating element is canceled.
  • the fixation is thus carried out according to the invention only in engine braking operation, while the actuating element, for example a Kipphebelrolle a rocker arm as an actuator, is located at the base circle of the cam.
  • This fixation is canceled shortly before the cam lift and then reactivated immediately.
  • a time-controllable fixation of the actuating element In particular, a rocker arm, it is possible to reliably prevent the unwanted inflation of the compensation elements and thus the unwanted keeping open the exhaust valves.
  • a design of the fixing is such that by means of this, for example, by a rocker arm formed actuator "continuously" or position can be fixed independently of position, particularly advantageous because here then the actuator can be fixed immediately in any actuator position, without that there are delays in the fixation, as may be the case, for example, in form-locking snap-in connections. This then advantageously also an adjustment of the fixing position to changing conditions within the valve train in a simple manner possible.
  • the effect of the at least one fixing device in the fully activated state is then preferably such that the adjustment effect of the HVA element is completely disabled, at least during engine braking operation, ie, the actuating element is rigidly locked in its position "is held and the at least one fixing device thus exerts a holding force on the actuating element, which is greater than the adjusting force acting through the HVA element.
  • the actuating element can be formed by a two-part rocker arm with a cam-side cam lever and an exhaust valve-side operating lever, wherein the fixing device can then interact with the actuating lever and / or with the cam lever.
  • the fixing device may be formed by at least one electromagnet, which is activated in accordance with activated during engine braking operation and when passing through the cam base circle of the actuating element or rocker arm.
  • electromagnet which is activated in accordance with activated during engine braking operation and when passing through the cam base circle of the actuating element or rocker arm.
  • electronic control this may be a modified engine control unit
  • the actuator can be made entirely or in part only from a magnetically attractable material or be coated with such.
  • the electromagnet with its magnetic force act on the tilting lever against the adjusting action of the HVA element or stabilize the movement to effectively counteract indifferent movement sequences.
  • the electromagnet is preferably arranged, for example, on the housing side of the internal combustion engine in the movement region of the actuating element designed as a rocker arm and outside its pivot axis.
  • a valve-train-side arrangement is possible. It is understood that the arrangement for a stepless or position-independent adjustability has to be made so that this is ensured, thus thus, for example, the electromagnet is arranged laterally of the actuating element or rocker arm.
  • solenoid is here to be understood in a comprehensive sense and should of course include all necessary for the realization of an electromagnetic action principle components.
  • the fixing device may be formed by at least one friction brake, which cooperates with the actuating element, in particular be formed by a about a Kipphebelachse formed as a rocker arm actuating element around friction brake.
  • a mechanical embodiment variant is created, which can decelerate the actuating element or the rocker arm and thus stabilize movement.
  • the fixing device designed as a friction brake may comprise at least one friction disc, which acts on a defined braking surface of the actuating element, in particular on a trained as a braking surface hub front side designed as a rocker arm actuating element.
  • the actuation of the friction brake can basically be done in different ways, with a hydraulic actuation of the friction brake is preferred.
  • a hydraulic control valve may be used for this purpose, which, for example, acts on a piston-cylinder unit acting on the friction disk as a function of the camshaft rotation during engine braking operation.
  • valve train which are actuated jointly by a valve bridge of the actuating element, wherein the first piston-cylinder unit is arranged in the valve bridge and at least a portion of the exhaust valves, in particular only on one of the exhaust valves acts.
  • the first piston-cylinder unit and the HVA may preferably be jointly supplied with pressurized oil from a pressure-circulation lubricating oil system of the internal combustion engine, wherein a check valve is arranged in the supply line to the first piston-cylinder unit, wherein the pressure chamber of the first piston Cylinder unit one in the closed state of the at least one exhaust valve controlled via a stationary counter-holder discharge line and the piston-cylinder unit and the valve spring of the exhaust valve are tuned so that opens the exhaust valve defined in the engine braking with appropriately closed exhaust valve in the exhaust system of the internal combustion engine remains.
  • Fig. 1 In the single figure ( Fig. 1 ) is only to the understanding of the present invention required a cylinder head 1 a valve-controlled four-stroke reciprocating internal combustion engine (diesel engine) shown in the next to the not apparent inlet valves here two exhaust valves 2, 3 (only the valve stems are visible) are guided displaceably , The valves 2, 3 kept closed in a known manner valve springs are not shown.
  • diesel engine diesel engine
  • the valve train acting on the exhaust valves 2, 3 is composed of a driving cam 4 of a camshaft of the internal combustion engine 1, a rocker arm 6 mounted on a fixed rocker shaft 5 and a valve bridge 7, which spans the two exhaust valves 2, 3 or their valve stems.
  • the functionally two-armed rocker arm 6 is exemplified here in two parts, with a cam lever 6a and acting on the valve bridge 7 operating lever 6b, which protrude from the bearing on the rocker shaft 5 to both sides.
  • the cam lever 6a is mounted by means of a separate pivot axis 8 on the actuating lever 6b and carries a rotatably mounted on an axle 9 roller 10, which starts at the cam 4 for driving the rocker arm 6.
  • a hydraulic valve clearance compensation element or HVA element 11 is disposed outside the pivot axis 8, which may be of known type and is therefore not further explained.
  • the actuating lever 6b of the rocker arm 6 is acted upon via an adjusting screw 12 (with lock nut) and a spherically mounted connecting cup 13, the valve bridge 7 at a position between the two exhaust valves 2, 3 position.
  • a stationary counter-holder 14 is provided above the valve bridge 7, whose function will be explained.
  • a piston-cylinder unit 15 is arranged, with a limited slidably guided in a pressure chamber 16 piston 17, which acts on the one outlet valve 2.
  • the pressure chamber 16 is connected via a feed channel 18 with an integrated ball check valve 19 and not shown, generally designated 20 feed channels in the connecting cup 13, the adjusting screw 12, the rocker arm 6 and finally on the Kipphebelachse 5 to the pressure circulation lubricating oil system Internal combustion engine connected. It is understood that in the rocker arm 6 also more channels 20 are provided for lubricating the moving parts of the valve train.
  • a discharge channel 21 defined cross section is also provided, which opens into the pressure chamber 16 of the piston-cylinder unit 15 and which is controlled by the stationary counter-holder 14.
  • HVA 11 By means of the HVA 11 can be eliminated in a known manner, for example due to wear valve clearance in the transmission chain between the cam 4 and the exhaust valves 2, 3 and the valve bridge 7, wherein the plunger 22 of the HVA element 11 extends or retracts accordingly and the distance s between the cam lever 6a and the operating lever 6b of the rocker arm 6 is changed accordingly.
  • a fixing device 23 and / or a fixing device 24 is provided in the power flow between the cam 4 and the exhaust valves 2, 3, which is activated during engine braking operation when passing through the cam base circle of the cam 4 and accordingly fixed in position the rocker arm 6, while they (the fixing device) is deactivated in the engine braking operation when passing through the cam portion of the cam 4 and, accordingly, the positional fixation of the rocker arm 6 is canceled, which is explained in more detail below by way of example:
  • the fixing device 23 is, for example, a controllable, fixed housing electromagnet 23 (hatched only), which is arranged in the range of movement of the actuating lever 6b such that it in the activated state (during the Nockengrund Vietnamesephase), the actuating lever 6b preferably fixed by means of magnetic force steplessly.
  • the electromagnet 23 is arranged here only for reasons of representability above the rocker arm 6. To implement and realize a stepless adjustability of this is preferably the side of the rocker arm 6, that is, one has to imagine the concrete position of the electromagnet 23 so that this starting from the schematic diagram of the Fig. 1 ultimately rotated 90 degrees into or out of the image plane and is located there.
  • the solenoid 23 is preferably in a manner not shown via an electronic control (for example, a correspondingly modified engine control unit) so controlled that its fixing effect on the rocker arm 6 only when passing through the cam base circle of the cam 4 and only applies during engine braking operation, while he cam lift or is switched inactive in regular, fired engine operation.
  • an electronic control for example, a correspondingly modified engine control unit
  • a friction brake 24 may additionally or alternatively be used as a fixing device for fixing the rocker arm 6.
  • at least one non-rotatably mounted friction disc 25 can then be arranged around the rocker shaft 5, which starts at one of the end faces 6c of the actuating lever 6b of the rocker arm 6.
  • the operating lever 6b of the rocker arm 6 can be braked and fixed accordingly.
  • the friction brake 24 is hydraulically operable such that the friction and ultimately the locking action only occurs as the base circle of the cam 4 passes and during engine braking while it is inactive as it passes through the cam portion and in powered engine operation.
  • a one-piece rocker arm or rocker arm with or without roller contact to the cam 4 and with appropriate arrangement of the HVA element 11 in the power flow between the cam 4 and exhaust valve 2 may be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Claims (12)

  1. Dispositif d'actionnement d'au moins une soupape d'échappement d'un moteur à combustion interne à commande par soupape pour véhicules automobiles, comprenant un élément d'actionnement (6) entraîné par un arbre à cames, en particulier d'un levier oscillant entraîné par un arbre à cames en tant qu'élément d'actionnement, une première unité cylindre-piston (15), de préférence sollicitée hydrauliquement, étant montée dans le flux de force entre une came (4) de l'arbre à cames et au moins une soupape d'échappement (2), au moyen de laquelle unité cylindre-piston au moins une soupape d'échappement (2), en mode de frein moteur, peut être retenue avec un refoulement de gaz d'échappement dans une position intermédiaire non fermée, et comprenant une deuxième unité cylindre-piston (11) qui est réalisée sous forme d'élément d'équilibrage du jeu de soupape, de préférence hydraulique, caractérisé en ce que dans le flux de force entre la came (4) et la soupape d'échappement (2) est prévu au moins un dispositif de fixation (23 ; 24) pour la fixation de l'élément d'actionnement (6), le dispositif de fixation (23 ; 24) étant réalisé et/ou pouvant être commandé de telle sorte que celui-ci, en mode de frein moteur, soit activé lors du parcours du cercle de base de came de la came (4) et que par conséquent l'élément d'actionnement (6) soit fixé en position, et que celui-ci, en mode de frein moteur, soit désactivé lors du parcours de la zone de came de la came (4) et que par conséquent la fixation en position de l'élément d'actionnement (6) soit supprimée.
  2. Dispositif selon la revendication 1, caractérisé en ce que l'au moins un dispositif de fixation est réalisé de telle sorte qu'il permette la fixation continue et/ou indépendante de la position de l'élément d'actionnement.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'élément d'actionnement (6) est formé par un levier oscillant en deux parties comprenant un levier de came (6a) du côté de la came et un levier d'actionnement (6b) du côté de la soupape d'échappement, le dispositif de fixation (23 ; 24) coopérant alors avec le levier d'actionnement (6b) et/ou le levier de came (6a).
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de fixation (23) est formé par au moins un électroaimant.
  5. Dispositif selon la revendication 4, caractérisé en ce que le dispositif de fixation (23) formé par l'électroaimant est disposé, de préférence du côté du boîtier sur la culasse (1), dans la région de déplacement de l'élément d'actionnement (6) réalisé de préférence sous forme de levier oscillant et en dehors de son axe de pivotement (5).
  6. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le dispositif de fixation (24) est formé par au moins un frein à friction, en particulier par un frein à friction disposé autour d'un axe de levier oscillant (5) d'un élément d'actionnement (6) réalisé sous forme de levier oscillant.
  7. Dispositif selon la revendication 6, caractérisé en ce que le dispositif de fixation (24) réalisé sous forme de frein à friction présente au moins un disque de friction (25) qui agit sur une surface de frein définie de l'élément d'actionnement (6), en particulier sur un côté frontal de moyeu (6c) d'un élément d'actionnement (6) réalisé sous forme de levier oscillant, réalisé en tant que surface de frein.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que le frein à friction (24) est actionné hydrauliquement.
  9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que dans la commande de soupape sont prévues plusieurs, en particulier deux, soupapes d'échappement (2, 3) par cylindre du moteur à combustion interne, lesquelles sont actionnées en commun par le biais d'un pont de soupape (7) par l'élément d'actionnement (6), la première unité cylindre-piston (15) étant disposée dans le pont de soupape (7) et agissant sur au moins une partie des soupapes d'échappement (2), en particulier seulement sur une soupape d'échappement (2).
  10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la première unité cylindre-piston (15) et la deuxième unité cylindre-piston (11) sont alimentées en huile lubrifiante en commun par un système d'huile lubrifiante à circulation sous pression du moteur à combustion interne, un clapet anti-retour (19) étant disposé dans la conduite d'amenée (18) à la première unité cylindre-piston (15),
    en ce que l'espace de pression (16) de la première unité cylindre-piston (15) présente en outre une conduite d'écoulement (21) commandée par le biais d'un contre-support fixe (14) dans l'état fermé de l'au moins une soupape d'échappement (2, 3), et
    en ce que l'unité cylindre-piston (15) et le ressort de soupape de la soupape d'échappement (2) sont adaptés l'un à l'autre de telle sorte qu'en mode de frein moteur lorsque le clapet des gaz d'échappement est fermé de manière correspondante, la soupape d'échappement (2) reste ouverte de manière définie dans le système de gaz d'échappement du moteur à combustion interne.
  11. Procédé pour actionner au moins une soupape d'échappement (2) d'un moteur à combustion interne à commande par soupape, en particulier au moyen d'un dispositif selon l'une quelconque des revendications précédentes, comprenant un élément d'actionnement (6) entraîné par un arbre à cames, en particulier d'un levier oscillant entraîné par un arbre à cames en tant qu'élément d'actionnement, une première unité cylindre-piston (15), de préférence sollicitée hydrauliquement, étant montée dans le flux de force entre une came (4) de l'arbre à cames et au moins une soupape d'échappement (2), au moyen de laquelle unité cylindre-piston au moins une soupape d'échappement (2), en mode de frein moteur, est retenue avec un refoulement de gaz d'échappement dans une position intermédiaire non fermée, et comprenant une deuxième unité cylindre-piston (11) qui est réalisée sous forme d'élément d'équilibrage du jeu de soupape, de préférence hydraulique, caractérisé en ce que dans le flux de force entre la came (4) et la soupape d'échappement (2) est prévu au moins un dispositif de fixation (23 ; 24) pour la fixation de l'élément d'actionnement (6), le dispositif de fixation (23 ; 24) étant réalisé et/ou pouvant être commandé de telle sorte que celui-ci, en mode de frein moteur, soit activé lors du parcours du cercle de base de came de la came (4) et que par conséquent l'élément d'actionnement (6) soit fixé en position, et que celui-ci, en mode de frein moteur, soit désactivé lors du parcours de la zone de came de la came (4) et que par conséquent la fixation en position de l'élément d'actionnement (6) soit supprimée.
  12. Véhicule, en particulier véhicule utilitaire, comprenant un dispositif selon l'une quelconque des revendications 1 à 10, et/ou pour mettre en oeuvre un procédé selon la revendication 11.
EP14001704.7A 2013-09-19 2014-05-15 Dispositif et procédé d'actionnement d'au moins une soupape d'échappement d'un moteur à combustion interne commandé par soupape Active EP2851525B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013015499.5A DE102013015499A1 (de) 2013-09-19 2013-09-19 Vorrichtung und Verfahren zum Betätigen zumindest eines Auslassventils einer ventilgesteuerten Brennkraftmaschine

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EP2851525A1 EP2851525A1 (fr) 2015-03-25
EP2851525B1 true EP2851525B1 (fr) 2015-11-04

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EP14001704.7A Active EP2851525B1 (fr) 2013-09-19 2014-05-15 Dispositif et procédé d'actionnement d'au moins une soupape d'échappement d'un moteur à combustion interne commandé par soupape

Country Status (5)

Country Link
EP (1) EP2851525B1 (fr)
CN (1) CN104454064B (fr)
BR (1) BR102014013204B8 (fr)
DE (1) DE102013015499A1 (fr)
RU (1) RU2661921C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015016723A1 (de) * 2015-12-22 2017-08-03 Man Truck & Bus Ag Brennkraftmaschine mit einer Motorstaubremse und einer Dekompressionsbremse
CN106762012B (zh) * 2016-12-13 2019-04-09 大连理工大学 一种紧凑型锁定式多模式可变气门驱动系统

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54106716A (en) * 1978-02-10 1979-08-22 Nissan Motor Co Ltd Internal combustion engine
AT404288B (de) * 1986-10-30 1998-10-27 Avl Verbrennungskraft Messtech Motorbremse bei einer brennkraftmaschine für kraftfahrzeuge
JPH0941926A (ja) * 1995-08-03 1997-02-10 Mitsubishi Motors Corp 圧縮開放型エンジン補助ブレーキ装置
US7823553B2 (en) * 2007-03-16 2010-11-02 Jacobs Vehicle Systems, Inc. Engine brake having an articulated rocker arm and a rocker shaft mounted housing
JP5331343B2 (ja) * 2007-12-27 2013-10-30 ダイムラー・アクチェンゲゼルシャフト 内燃機関の可変動弁装置
EP2425105B1 (fr) * 2009-04-27 2014-07-23 Jacobs Vehicle Systems, Inc. Frein de moteur à culbuteur dédié
EP2438276A4 (fr) * 2009-06-02 2016-04-06 Jacobs Vehicle Systems Inc Procédé et système de freinage d'une crosse de soupape d'échappement unique
CN201513208U (zh) * 2009-08-19 2010-06-23 上海尤顺汽车部件有限公司 发动机制动装置
DE102009048104A1 (de) * 2009-10-02 2011-04-07 Man Nutzfahrzeuge Aktiengesellschaft Brennkraftmaschine mit einer Motorbremseinrichtung
CN202140128U (zh) * 2011-02-25 2012-02-08 奚勇 集成式的泄气型发动机制动装置
DE102011118537A1 (de) * 2011-05-04 2012-11-08 Man Truck & Bus Ag Brennkraftmaschine mit mindestens einem Brennraum
DE102012020594A1 (de) * 2012-10-22 2014-04-24 Man Truck & Bus Ag Vorrichtung zum Betätigen zumindest eines Auslassventils einer ventilgesteuerten Brennkraftmaschine

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Publication number Publication date
RU2661921C2 (ru) 2018-07-23
BR102014013204A2 (pt) 2016-04-12
RU2014131263A (ru) 2016-02-20
DE102013015499A1 (de) 2015-03-19
BR102014013204B1 (pt) 2022-01-04
CN104454064A (zh) 2015-03-25
BR102014013204B8 (pt) 2022-05-10
EP2851525A1 (fr) 2015-03-25
CN104454064B (zh) 2018-05-15

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