EP3000996B1 - Ensemble de commande auxiliaire destinée à commander l'ouverture/la fermeture des soupapes principales d'un moteur à combustion interne, en particulier pour une opération de freinage d'un moteur de décompression - Google Patents

Ensemble de commande auxiliaire destinée à commander l'ouverture/la fermeture des soupapes principales d'un moteur à combustion interne, en particulier pour une opération de freinage d'un moteur de décompression Download PDF

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Publication number
EP3000996B1
EP3000996B1 EP14185931.4A EP14185931A EP3000996B1 EP 3000996 B1 EP3000996 B1 EP 3000996B1 EP 14185931 A EP14185931 A EP 14185931A EP 3000996 B1 EP3000996 B1 EP 3000996B1
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EP
European Patent Office
Prior art keywords
auxiliary
cam
hydraulic
assembly
combustion engine
Prior art date
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EP14185931.4A
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German (de)
English (en)
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EP3000996A1 (fr
Inventor
Harald Fessler
Mathias Binder
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FPT Motorenforschung AG
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FPT Motorenforschung AG
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Priority to ES14185931.4T priority Critical patent/ES2632104T3/es
Priority to EP14185931.4A priority patent/EP3000996B1/fr
Publication of EP3000996A1 publication Critical patent/EP3000996A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length

Definitions

  • the present invention relates to a auxiliary command assembly for commanding the opening/closing of the head valves of a combustion engine, in particular for a decompression engine brake operation, in the field of industrial and commercial vehicles.
  • a cam pushes on an intermediate part of the finger follower, while the two opposite ends of the finger follower are one in contact with a head valve, and the other in contact with a reference point or adjustable point through said HLA means.
  • the rocker arm has a referenced fulcrum at an intermediate part of the arm itself, while its two opposite ends are one in contact with a head valve, and the other in contact with a cam directly or through a pushing rod.
  • the fulcrum can be provided with HLA means.
  • the lash adjusting means are often implemented for slightly varying of the lash of the valves according to various engine working conditions.
  • lash adjusting means are hydraulically type and called HLA, namely hydraulic lash adjustment.
  • a known system includes the axial shifting of the cam shaft enabling a different profile according to the activation of the engine braking condition. This solution implies several difficulties in order to avoid any interference between valve and pistons during the cam shifting. Costs and space requirements are high.
  • a further known approach is to operate with two valve lashes. The larger one is activated for fired operation and the small one for braking mode
  • valve train implements hydraulic elemet for adjusting the valve lash
  • the implementation of decompression engine brake systems is very difficult.
  • the HLA if present, have to be always loaded axially, namely in contact with its one end of finger follower of with the fulcrum of the rocker arm, in order to prevent the HLA from increasing its natural extension.
  • the HLA When the HLA is compressed again, it needs some time to reduce its extension, this forcing the valve opening by causing the interference among valves and pistons.
  • the present invention can be advantageously implemented in those combustion engines provided with rocket arm or with finger follower, without changing the standard exhaust cam profile, which remain constantly in contact with a respective roller of the finger follower or of the rocker arm.
  • the cam shaft is not shifted, therefore, there is no risk in term of shifting synchronization.
  • the main principle of the invention is to implement the activation of an auxiliary cam profile by moving accordingly the reference point defining a fulcrum of the oscillating arm - rocker arm or finger follower - present in any configuration even in case said reference point is provided with HLA.
  • the HLA in case the HLA is implemented, it remain constantly loaded without preventing its unwanted extension increasing.
  • the reference point coincides with the base of the HLA, which is shifted upwardly/downwardly by an actuator commanded by the auxiliary cam arranged, preferably, on the same cam shaft of the normal cam or it can be driven separately by the engine crankshaft.
  • said auxiliary cam commands said actuator assembly, which shift said reference point.
  • said means for moving the reference point comprise a hydraulic circuit which is pressurized/discharged according respectively with the activation/deactivation of an auxiliary strategy, namely a decompression engine braking strategy or an internal EGR strategy.
  • an auxiliary strategy namely a decompression engine braking strategy or an internal EGR strategy.
  • said means for moving the reference point comprise a leverage assembly suitable to mechanical (in the sense not hydraulic) shift said reference point.
  • the actuator move/translate the support or base of the HLA, the latter remaining always compressed between the finger follower/rocker arm and the actuator.
  • An object of the present invention is an auxiliary command assembly for commanding the opening/closing of the head valves of a combustion engine.
  • Another object of the present invention is a combustion engine comprising the above mentioned auxiliary valves command assembly.
  • a further object of the present invention is a vehicle provided of said combustion engine and a method corresponding to said structural auxiliary assembly.
  • Figure 1 and 2 show two different assemblies for commanding the engine head valves V.
  • FIG. 1 On figure 1 is shown a so called finger follower FF configuration with an oscillating arm having two opposite ends 1 and 2.
  • a second does not implies a first.
  • the first end is supported by a reference point RP, that can be provided of a HLA, during a normal engine operation condition, for example when the engine is fired.
  • the second end 2 is in contact with the stem of the engine head exhaust valve V for pushing it axially.
  • a "normal" roller R free to rotate and in contact with the "normal” cam C for commanding the opening of the exhaust valve V according to said normal operative condition.
  • the reference point RP is movable according to an auxiliary cam profile AC driven by the engine crankshaft to implement another engine operation, for example, an engine braking strategy, in order to command the opening of the exhaust valve, on or immediately after, the top dead center of its piston, or for example to implement an internal EGR strategy, in order to command the intake valves.
  • Said motion of the reference point is realized through an actuator assembly A commanded by said auxiliary cam AC.
  • the actuator assembly shift/lift the base/support of the HLA.
  • rocker arm RA having two opposite ends 1 and 2.
  • the first end 1 is supported by a "normal" cam C, directly or through a pushing rod, which commands the oscillation of the rocker arm for opening the respective exhaust valve during the normal engine operation condition.
  • the second end 2 is contact with the stem of the engine head exhaust valve V as for the previous embodiment.
  • An intermediate portion of the rocker arm is in contact with a reference point RP acting as a fulcrum for the oscillations, that, according to the present invention is shifted/lifted according to an auxiliary cam profile.
  • the fulcrum position of the oscillating arm changes, commanding the opening/closing of the valve V according to a second engine operation condition, namely, at least partially overrunning the action of the normal cam.
  • the three elements V, RP and C develop corresponding forces substantially parallel between each other, on the oscillating arm, and substantially perpendicularly with respect to the development of the oscillating arm itself.
  • the cam C is usually supported by a cam shaft CS driven by the crankshaft.
  • FIGS. 3 or 4 show a first preferred embodiment of the invention, called for convenience “hydraulic embodiment", where a piston P is directly actuated by the auxiliary cam AC through the auxiliary roller AR for commanding the hydraulic actuator A.
  • the piston P is operatively coupled with the actuator A, by means of a hydraulic circuit HC.
  • the auxiliary cam AC commands the moving of the piston, by pumping medium towards the actuator A which, in turn, forces the lifting/shifting of the reference point RP of the oscillating arm to oscillate and then the exhaust valve V to open.
  • the external hollowing of the HLA could define the moving part of piston A.
  • the auxiliary cam AC is keyed on the cam shaft CS bearing the "normal" cam C.
  • On figure 5 is shown a configuration similar to the one on figure 3 , where also the "normal" cam IC and its corresponding finger follower FF' of the intake valve is shown, with its fixed reference point RP' and its own “normal” cam IC is in contact with the roller IR.
  • the same scheme can be implemented also to use a "second operation strategy" on the intake side, by leaving unchanged the behaviour of the exhaust portion.
  • the present invention can be implemented any additional engine operation, by changing the behaviour of the intake and/or exhaust valves. It is clear that for implementing different strategies in the intake side and exhaust side, two auxiliary cams are needed to independently control the different strategies on the intake and/or exhaust valves.
  • FIG 6 On figure 6 is shown a configuration where two valves, for example to intake valves or two exhaust valves, are commanded by the auxiliary cam AC during an auxiliary operation strategy of the combustion engine.
  • the auxiliary roller AR is in contact with the auxiliary cam AC through an auxiliary spring, aging between the auxiliary roller support and a fixed part of the engine head.
  • the piston P is always in operation, independently from the pressurization/depressurization of the hydraulic circuit.
  • the actuator is commanded only if the hydraulic circuit HC is pressurized.
  • the hydraulic piston P is of the double-room type.
  • the first room R1 is operatively connected with the hydraulic circuit HC towards the actuator A.
  • the second room R2, on the opposite side of the piston is operatively connected with a hydraulic medium source HS, that can be the oil gallery of the combustion engine, usually pressurized by a oil pump.
  • a hydraulic medium source HS that can be the oil gallery of the combustion engine, usually pressurized by a oil pump.
  • the first and second rooms are operatively connected between each other through a two position valve 2PV associated with a check valve CHV.
  • the first position (left portion) permits the free flowing of the medium from the first room to the second room, when the piston P is pushed by the braking cam.
  • the piston P lowers and the auxiliary roller could be spaced apart from the auxiliary cam AC.
  • a spring shown in figure 7 , can be used to avoid the departing of the auxiliary roller form the auxiliary cam.
  • the second portion of the valve (right side), instead, permits the hydraulic source HS to pressurize the hydraulic circuit HC, and the check valve prevents the medium from flowing back towards the hydraulic source, when the piston is pushed by the braking cam.
  • the piston P rises and cooperate with the spring, if present, to maintain the auxiliary roller in contact with auxiliary cam AC.
  • FIG 8 is shown another embodiment with a single room R1 piston P.
  • the room R1 is connected either with the hydraulic circuit HC and also with the hydraulic source HS by means of a two position hydraulic valve.
  • the first position (left side), as in the previous embodiment, permits the medium to flow back from the hydraulic circuit to the hydraulic source when the piston P is pushed by the braking cam.
  • the actuator does not receive sufficient pressure to lift its reference point RF.
  • This embodiment lacks the braking spring of the previous embodiment. Thus, when the valve is in the first position, the piston remain lifted for effect of the pressurization offered by the hydraulic source HS.
  • Figure 9 shows the solution of figure 5 , through a perspective view. On this figure, also a portion of the valves V is visible. Such valves could be intake or exhaust valve, according to the auxiliary strategy intended to be adopted.
  • auxiliary cam can be keyed on another shaft different form the cam shaft commanding the valves during normal operation.
  • This second shaft receives the rotating motion from the crankshaft as the cam shaft.
  • the invention can be implemented in any manner comprising a braking cam which commands the motion of the reference point of the oscillating arm FF, RA, independently from a finger follower or rocker arm implementation.
  • the normal opening of the exhaust valves is commanded by a conventional or "normal" cam, while the "auxiliary" opening of the exhaust valves is actuated by lifting their respective reference point RP commanded by the auxiliary cam AC.
  • piston P can be replaced by a first pushing rod, the actuator A with a second pushing rod and living only the interconnection between them commanded through the pressurization/depressurization of a hydraulic actuator or through the activation of an electric actuator.
  • a V-shaped oscillating arm VS, V-arm in the following, has its vertex V hinged to a movable point, while a first end V1 defines a support for the reference point of the finger follower FF and the other end V2 carries an auxiliary roller suitable to contact said auxiliary cam AC.
  • the vertex V is moved in order to induce the auxiliary roller to properly contact the auxiliary cam, the first end of the V-arm is pushed by the auxiliary cam, that induces the oscillation of the V-arm on the vertex V.
  • the end V1 lifts the reference point RP of the finger follower FF.
  • the V-arm defines, contemporarily the auxiliary actuator assembly shifting the reference point RP and the connection means between the auxiliary roller and the auxiliary actuator assembly.
  • the vertex V of the V-arm can be shifted in several ways. For example through an electrical actuator, or pneumatic one directly connected to the hinging point at the vertex V.
  • the actuator is not arranged close to the reference point RP, or just under the HLA as for the previous "hydraulic embodiments".
  • this arrangement can be adapted to be implemented also in a rocker arm scheme.
  • an auxiliary arm AA is shown, that has an intermediate point FA hinged to a fixed part of the combustion engine head.
  • the first end is hinged to the vertex V of the V-arm, while the second, opposite, end V3 is lifted/lowered by an actuator.
  • auxiliary arm is really advantageous, even not mandatory, due to the possibility to implement short running but fast actuators, namely piezoelectric actuators. Therefore, the auxiliary arm is capable to amplify the movement of the short running actuator, by shifting the hinging point V of the V-arm.
  • the reference point RP can be moved also according to a required adjustment of the valve lash, for example through the HLA.
  • the HLA can expand/retract accordingly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (15)

  1. Ensemble de commande auxiliaire pour commander l'ouverture/la fermeture des soupapes principales (IV, EV) d'un moteur à combustion comprenant
    - un bras oscillant (FF, RA) ayant une première extrémité (2) en contact avec une tige de soupape, pour la pousser axialement pendant une procédure d'ouverture de la soupape (V) elle-même,
    - une came normale (C) entraînée par un vilebrequin de moteur à combustion, couplée audit bras oscillant commandant ladite oscillation,
    - un point de référence (RP) définissant un pivot de ladite oscillation du bras oscillant (FF, RA),
    l'ensemble de commande auxiliaire comprenant
    et caractérisé en ce qu'il comprend
    - une came auxiliaire (AC) entraînée par ledit vilebrequin de moteur à combustion,
    - un rouleau auxiliaire, adapté pour être apparié avec ladite came auxiliaire (AC) pour suivre un profil de celle-ci,
    - un ensemble d'actionneur (A) adapté pour soulever/abaisser ledit point de référence (RP) selon une interaction entre ladite came auxiliaire et ledit rouleau auxiliaire,
    - un moyen pour interconnecter ledit actionneur (A) et ledit rouleau auxiliaire (AR) pendant une condition de fonctionnement de moteur auxiliaire, par dépassement au moins partiel de l'action de commande de ladite came normale (C).
  2. Ensemble selon la revendication 1, dans lequel lesdits moyens d'interconnexion comprennent un premier piston hydraulique (P) relié fonctionnellement audit rouleau auxiliaire (AR), dans lequel ledit ensemble d'actionneur (A) comprend un deuxième piston hydraulique, et dans lequel lesdits moyens d'interconnexion comprennent un circuit hydraulique, dont la pressurisation est contrôlable selon l'activation/la désactivation d'un fonctionnement de moteur auxiliaire.
  3. Ensemble selon l'une des revendications précédentes 1 ou 2, dans lequel ledit ensemble comprend un moyen HLA, pour l'ajustage du jeu de la soupape (V), définissant ledit point de référence (RP) et dans lequel ledit ensemble d'actionneur (A) est adapté pour soulever/abaisser ledit point de référence (RP) par déplacement d'un support/d'une base du moyen HLA.
  4. Ensemble selon la revendication 3, dans lequel un évidement externe dudit HLA définit une partie mobile dudit deuxième piston hydraulique.
  5. Ensemble selon l'une des revendications précédentes 2 - 4, dans lequel ledit premier piston hydraulique (P) est de type double chambre ayant une première chambre (R1) reliée fonctionnellement audit circuit hydraulique (HC), une deuxième chambre opposée (R2) reliée fonctionnellement à une source de milieu hydraulique (HS), dans lequel les première et deuxième chambres sont reliées fonctionnellement entre elles par le biais d'une soupape de commande (2PV) associée à une soupape de contrôle (CHV) adaptée, selon une première condition, pour permettre l'écoulement libre du milieu de la première chambre à la deuxième chambre et adaptée, selon une deuxième condition, pour permettre à la source hydraulique (HS) de mettre sous pression le circuit hydraulique (HC), mais empêchant le milieu hydraulique de refluer vers la source hydraulique, lorsque le premier piston (P) est poussé par la came auxiliaire.
  6. Ensemble selon l'une des revendications précédentes 2 à 4, dans lequel ledit piston hydraulique (P) a une seule chambre (R1) reliée soit au circuit hydraulique (HC) et aussi à une source hydraulique (HS) au moyen d'une soupape adaptée, selon une première condition, pour permettre au milieu hydraulique de refluer du circuit hydraulique à la source hydraulique, et adaptée, selon une deuxième condition, pour permettre à l'huile de s'écouler de la source hydraulique au circuit hydraulique, mais pas inversement.
  7. Ensemble selon la revendication 1, dans lequel ledit ensemble d'actionneur (A) et ledit moyen d'interconnexion comprennent un bras oscillant en forme de V (VS) ayant son sommet (V) articulé à un point mobile, pendant qu'une deuxième extrémité (V1) définit un support pour ledit point de référence (RP) et l'autre extrémité (V2) porte ledit rouleau auxiliaire (AR) adapté pour entrer en contact avec ladite came auxiliaire (AC).
  8. Ensemble selon la revendication 7, comprenant en outre un autre actionneur ayant une partie mobile articulée audit sommet V, afin d'activer/de désactiver un transfert de mouvement entre la came auxiliaire (AC) et le point de référence (RP).
  9. Ensemble selon la revendication 7, comprenant en outre un bras auxiliaire (AA) ayant un point intermédiaire (FA) articulé à une partie fixe de la culasse de moteur à combustion, une deuxième extrémité articulée au sommet (V) dudit bras oscillant en forme de V (VS), pendant que sa deuxième extrémité opposée (V3) est soulevée/abaissée par un autre actionneur, l'oscillation du bras auxiliaire activant/désactivant un transfert de mouvement entre la came auxiliaire (AC) et le point de référence (RP).
  10. Ensemble selon les revendications 8 ou 9, dans lequel ledit autre actionneur est hydraulique, pneumatique ou piézoélectrique.
  11. Ensemble selon l'une quelconque des revendications précédentes 1 à 10, dans lequel lesdites soupapes principales (IV, EV) comprennent au moins une soupape d'admission et ladite came auxiliaire est façonnée et orientée angulairement afin de mettre en oeuvre une opération EGR interne.
  12. Ensemble selon l'une quelconque des revendications précédentes 1 à 10, dans lequel lesdites soupapes principales (IV, EV) comprennent au moins une soupape d'échappement et ladite came auxiliaire est formée et orientée angulairement afin de mettre en oeuvre une opération de freinage d'un moteur de décompression.
  13. Moteur à combustion comprenant au moins un ensemble de commande auxiliaire commandant l'ouverture/la fermeture des soupapes principales (IV, EV) selon la revendication 11 et/ou 12.
  14. Véhicule terrestre comprenant un moteur à combustion selon la revendication 13.
  15. Méthode de réalisation d'une condition de fonctionnement de moteur à combustion auxiliaire par le biais d'un ensemble commandant l'ouverture/la fermeture des soupapes principales (IV, EV) du moteur à combustion, la méthode comprenant les étapes suivantes :
    - agencement d'une came auxiliaire (AC) adaptée pour être entraînée par le vilebrequin de moteur à combustion,
    - agencement d'un rouleau auxiliaire, adapté pour être apparié avec ladite came auxiliaire (AC) pour suivre un profil de celle-ci,
    - agencement d'un ensemble d'actionneur (A) adapté pour soulever/abaisser un point de référence (RP) définissant un pivot d'un bras oscillant (FF, RA) commandant une soupape (V), selon une interaction entre ladite came auxiliaire et ledit rouleau auxiliaire,
    - interconnexion dudit ensemble d'actionneur (A) et dudit rouleau auxiliaire (AR) pendant une condition de fonctionnement de moteur auxiliaire, par dépassement au moins partiel de l'action de commande d'une came normale (C) entraînant ledit bras oscillant.
EP14185931.4A 2014-09-23 2014-09-23 Ensemble de commande auxiliaire destinée à commander l'ouverture/la fermeture des soupapes principales d'un moteur à combustion interne, en particulier pour une opération de freinage d'un moteur de décompression Active EP3000996B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES14185931.4T ES2632104T3 (es) 2014-09-23 2014-09-23 Conjunto de control auxiliar para controlar la apertura/cierre de las válvulas de impulsión de un motor de combustión, en particular para una operación de freno de motor por descompresión
EP14185931.4A EP3000996B1 (fr) 2014-09-23 2014-09-23 Ensemble de commande auxiliaire destinée à commander l'ouverture/la fermeture des soupapes principales d'un moteur à combustion interne, en particulier pour une opération de freinage d'un moteur de décompression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14185931.4A EP3000996B1 (fr) 2014-09-23 2014-09-23 Ensemble de commande auxiliaire destinée à commander l'ouverture/la fermeture des soupapes principales d'un moteur à combustion interne, en particulier pour une opération de freinage d'un moteur de décompression

Publications (2)

Publication Number Publication Date
EP3000996A1 EP3000996A1 (fr) 2016-03-30
EP3000996B1 true EP3000996B1 (fr) 2017-05-10

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Country Status (2)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108071442A (zh) * 2017-11-29 2018-05-25 大连理工大学 一种变模式气门机构

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
JPS60204912A (ja) * 1984-03-29 1985-10-16 Aisin Seiki Co Ltd 可変気筒用油圧リフタ
EP0775252B1 (fr) * 1993-05-24 2003-03-26 SYED, Ahmed Systeme de distribution a programme variable
DE10220692A1 (de) * 2002-05-10 2003-11-20 Hydraulik Ring Gmbh Ventilhubsteuerung für Verbrennungsmotoren von Kraftfahrzeugen
DE102004048071A1 (de) * 2004-10-02 2006-04-20 Ina-Schaeffler Kg Ventiltrieb für ein nockenbetätigtes Hubventil
DE102011005575A1 (de) * 2011-03-15 2012-09-20 Schaeffler Technologies Gmbh & Co. Kg Ventiltrieb mit Zusatzhub im Nockengrundkreis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108071442A (zh) * 2017-11-29 2018-05-25 大连理工大学 一种变模式气门机构
CN108071442B (zh) * 2017-11-29 2021-04-09 大连理工大学 一种变模式气门机构

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ES2632104T3 (es) 2017-09-08

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