EP2464833B1 - Commande pour actionner des soupapes de changement des gaz sur des moteurs à combustion interne - Google Patents

Commande pour actionner des soupapes de changement des gaz sur des moteurs à combustion interne Download PDF

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Publication number
EP2464833B1
EP2464833B1 EP10760229.4A EP10760229A EP2464833B1 EP 2464833 B1 EP2464833 B1 EP 2464833B1 EP 10760229 A EP10760229 A EP 10760229A EP 2464833 B1 EP2464833 B1 EP 2464833B1
Authority
EP
European Patent Office
Prior art keywords
cam
switching
sleeves
valve train
sleeve
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.)
Not-in-force
Application number
EP10760229.4A
Other languages
German (de)
English (en)
Other versions
EP2464833A2 (fr
Inventor
Andreas Werler
Thomas Arnold
Heiko Neukirchner
Jörg Wutzler
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.)
IAV GmbH Ingenieurgesellschaft Auto und Verkehr
Original Assignee
IAV GmbH Ingenieurgesellschaft Auto und Verkehr
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 IAV GmbH Ingenieurgesellschaft Auto und Verkehr filed Critical IAV GmbH Ingenieurgesellschaft Auto und Verkehr
Publication of EP2464833A2 publication Critical patent/EP2464833A2/fr
Application granted granted Critical
Publication of EP2464833B1 publication Critical patent/EP2464833B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L13/0015—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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0042—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams being profiled in axial and radial direction
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49293—Camshaft making

Definitions

  • the invention relates to a valve train for internal combustion engines for actuating gas exchange valves with the features mentioned in the preamble of claim 1.
  • the disadvantage here is the high space requirement, which is needed to adjust the cam carrier. These solutions are therefore only applicable at relatively large cylinder spacings to accommodate the corresponding components can. Another disadvantage is the high mass forces that occur during the adjustment process, which are needed to move the cam carrier or the adjusting organs. Switching over to a corresponding cam contour can only be done in a cylinder-selective manner. Valve-selective switching is not possible.
  • the DE 100 54 623 A1 describes a device for switching a cam carrier on a camshaft for actuating gas exchange valves, in which the cam carrier is guided axially displaceably on the camshaft. According to the position of the cam carrier, the gas exchange valve is in operative connection with different cam contours.
  • the control element is a radially outwardly displaceable pin, which is connected to at least two in a by about 180 ° around the cam carrier arranged around guide part formed link tracks in the extended state cooperates.
  • a disadvantage of this solution in addition to the additional space for the guide member is that extended to switch to another cam contour of the pin from the camshaft and must be meshed in an axially displaceable shift gate. After switching, the pin must be retracted. This design is very part and production-consuming and there is a risk of damage to the camshaft by faulty circuits of the pin.
  • Another disadvantage is that the motor speed is limited by the necessary actuating time of the pin. In addition, the adjustment depends on the existing oil pressure.
  • the disadvantage of this solution is that only a plurality of cam carriers arranged on the cam carrier can be moved simultaneously by the axial displacement of the adjusting. A different circuit of individual cam carriers on a camshaft is not possible.
  • Another disadvantage is that at a switching position in which an outer cam is engaged with the gas exchange valves, the spring element is constantly stretched. As a result, high lateral frictional forces occur between the driving piece and the guideway arranged on the adjusting member. An increased wear and associated possible faulty circuits are the result.
  • a further disadvantage is that the acting spring forces must be set accurately to faulty circuits, in particular when switching back to the central cam profile with three different cam profiles, to avoid.
  • valve train for actuating gas exchange valves of internal combustion engines.
  • the displacement of the cam carrier for valve switching on the camshaft tube is effected by a rotatable switching shaft arranged in the interior of the camshaft tube.
  • the switching shaft is provided with a switching contour having an axial slope.
  • a switching ball is guided, which is mounted in a bore of a switching shaft surrounding the axially displaceable shift sleeve.
  • the switching sleeve is connected via a driver with the cam carrier in operative connection.
  • the invention has for its object to provide a valve train for actuating gas exchange valves of internal combustion engines, which is characterized by a simplified structure while reducing the friction forces occurring.
  • the valve drive according to the invention for internal combustion engines for actuating gas exchange valves consists of a driven by a crankshaft of the internal combustion engine camshaft, which is formed of a plurality of individual mutually axially displaceable cam sleeves.
  • On each cam sleeve several different cam profiles are arranged with the same base circle section, which can be brought by displacement of the individual cam sleeves with the gas exchange valves engaged.
  • a co-rotating with the cam sleeves switching shaft is arranged, which are in each case via a switching pin with the respective cam sleeve in operative connection.
  • each cam sleeve At the inner periphery of each cam sleeve, a circumferential switching contour is arranged, in which the driver is slidably mounted.
  • the switching shaft is connected to an actuator with which a relative rotation of the switching shaft relative to the cam sleeves is triggered during a switching operation for moving the cam sleeves.
  • the advantage of the solution according to the invention consists in a simple design of the actuator for safe valve switching between different cam profiles of the camshaft at the same time the friction occurring between the individual components has been reduced.
  • valve drive for actuating gas exchange valves consists of a driven by a crankshaft of the internal combustion engine camshaft, which is formed of a plurality of individual mutually axially displaceable cam sleeves 7.
  • Each cylinder of a multi-cylinder internal combustion engine is associated with an axially displaceable cam sleeve 7, with which, according to the embodiment, two gas exchange valves of a cylinder can be actuated by the two cam profiles 9 arranged on the cam sleeve 7.
  • the cam sleeve 7 has at a same base circle portion 10 a plurality of differently shaped cam profiles 9a, 9b and 9c, which are brought to Ventilhubumsciens either by moving the cam sleeve 7 respectively directly or via non-illustrated intermediate members with a respective gas exchange valve in contact.
  • each has Cam sleeve 7 two cam profiles 9, each with a small cam profile 9a, a central cam profile 9b and a large cam profile 9c for actuating the two gas exchange valves, on.
  • the cam profiles 9 of each cam sleeve 7 are formed from only two or more than three different sized cam profiles.
  • the curves of the cam profiles 9a, 9b and 9c can be arranged offset to one another.
  • the individual mutually axially displaceable cam sleeves 7 are connected to each other by an axially extending toothing 8.
  • the cam sleeves 7 are formed such that the toothing 8 of the respectively adjacent cam sleeves 7 are formed engaging one another. This ensures that the individual cam sleeves 7 are mutually axially displaceable and rotatably connected to each other.
  • a switching shaft 1 is arranged, which, except during the switching process, rotates synchronously with the cam sleeves 7.
  • Each cam sleeve 7 is connected via a switching pin 3 with the switching shaft 1 in operative connection.
  • the shift pin 3 is fixedly connected to the shift shaft 1 and slidably mounted in a circumferentially arranged on the inner circumference of the cam sleeves 7 switching contour 2.
  • the arranged on the inner circumference of the cam sleeves 7 circumferential switching contour 2 has a plurality of different axial slopes.
  • the individual axial slopes of the arranged for each cam sleeve 7 switching contour 2 on the inner circumference of the cam sleeves 7 are arranged offset from one another.
  • the individual axial slopes of the switching contour 2 arranged for each cam sleeve 7 lie on the inner circumference of the cam sleeves 7 in the same axial plane.
  • the switching shaft 1 is connected to one with an actuator 6 for generating a relative rotation of the switching shaft 1 relative to the cam sleeves 7 in operative connection.
  • the actuator 6 may be connected directly or as shown in the drawing via a cam gear with the shift shaft 1.
  • the cam mechanism consists of a arranged on the circumference of the switching shaft 1 switching contour 13 in the sliding a switching ball 4 is mounted, which in turn is mounted in a arranged on the inner circumference of a sliding piece 5 hemispherical receptacle.
  • the sliding piece 5 is rotatably but axially displaceably connected to a cam sleeve 7. The connection between the cam sleeve 7 and sliding piece 5 takes place via an intermeshing axial toothing.
  • the sliding piece 5 can be brought into operative connection with a housing of the internal combustion engine firmly connected actuator 6.
  • a pin 11 arranged on the actuator 6 engages in the contour 12 arranged on the circumference of the displacement piece 5.
  • the sliding piece 5 is axially displaceable relative to a cam sleeve 7 in both directions according to the double arrow shown in the drawing.
  • variable valve train for realizing a changeover between the different cam profiles 9a, 9b and 9c is as follows.
  • the central cam profiles 9b of the cam sleeve 7 with the gas exchange valves, the cam sleeves 7, the switching shaft 1 and the sliding piece 5 rotate at a synchronous speed.
  • the actuator 6 is not engaged with the sliding piece 5.
  • a changeover to another cam profile can only be performed when the base circle portion 10 is in engagement with the gas exchange valve or the intermediate member.
  • the actuator 6 is activated by a corresponding control and brought into engagement with the sliding piece 5. In the described embodiment, this takes place in that a pin 11 is extended in the direction of the sliding piece 5 and engages in the contour 12 arranged on the circumference of the sliding piece 5.
  • the sliding piece 5 is axially displaced relative to the cam sleeve 7 by the pin 11 sliding in the contour 12 to the right or to the left, according to the switching operation to be carried out.
  • the axial movement of the sliding piece 5 is translated into a rotation of the shift shaft 1.
  • Due to the relative rotation of the hemispherical formed part of the switching pin 3 slides in the path of the rotating switching contour 2 of the cam sleeve 7.
  • According to the realized relative rotation and the execution of the individual with each cam sleeve 7 via the switching balls 3 operatively connected switching contours 2 takes place an axial displacement of the cam sleeves 7 against each other and thus switching between the individual cam profiles 9a, 9b and 9c.
  • the displacement of the sliding piece 5 can also be effected, for example, by an actuator 6 that acts magnetically on the sliding piece 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (6)

  1. Commande de soupape pour des moteurs à combustion interne pour l'actionnement de soupapes d'échange de gaz, dans laquelle les soupapes d'échange de gaz peuvent être amenées en prise de manière commutable avec des profils de came différents d'un arbre à cames entraîné par un vilebrequin du moteur à combustion interne,
    caractérisée en ce que
    - l'arbre à cames est formé de plusieurs manchons de cames (7) individuels déplaçables axialement les uns par rapport aux autres,
    - sur chaque manchon de came (7) sont disposés plusieurs profils de cames différents (9a, 9b, 9c) ayant une portion de cercle de base identique (10),
    - à l'intérieur des manchons de cames (7) est disposé un arbre de commutation (1) entraîné en rotation avec les manchons de cames (7),
    - à l'intérieur de chaque manchon de came (7) est disposé un contour de commutation périphérique (2),
    - chaque manchon de came (7) est en liaison fonctionnelle avec l'arbre de commutation (1) par le biais d'une goupille de commutation (3) glissant dans le contour de commutation périphérique (2),
    - l'arbre de commutation (1) est en liaison fonctionnelle avec un actionneur (6) pour produire une rotation relative de l'arbre de commutation (1) par rapport aux manchons de cames (7).
  2. Commande de soupape selon la revendication 1,
    caractérisée en ce que
    les manchons de cames (7) déplaçables axialement sont connectés les uns aux autres par une denture (8) s'étendant axialement, les dentures (8) des manchons de cames adjacents (7) respectifs étant réalisées de manière à s'engager les unes dans les autres.
  3. Commande de soupape selon les revendications 1 et 2,
    caractérisée en ce que
    le contour de commutation périphérique (2) présente plusieurs pentes axiales différentes.
  4. Commande de soupape selon les revendications 1 à 3,
    caractérisée en ce que
    dans le cas d'un déplacement axial à effectuer successivement des manchons de cames (7) individuels, les pentes axiales individuelles du contour de commutation (2) prévu pour chaque manchon de came (7) sont disposées de manière décalée les unes par rapport aux autres sur 'la périphérie interne des manchons de cames (7).
  5. Commande de soupape selon les revendications 1 à 3,
    caractérisée en ce que
    dans le cas d'un déplacement axial à effectuer simultanément des manchons de cames (7) individuels, les pentes axiales individuelles du contour de commutation (2) prévu pour chaque manchon de came (7) sont disposées dans le même plan axial sur la périphérie interne des manchons de cames (7).
  6. Commande de soupape selon les revendications 1 à 5,
    caractérisée en ce que
    l'arbre de commutation (1) est connecté par le biais d'une commande à cames à un élément de coulissement (5) disposé de manière solidaire en rotation mais déplaçable axialement par rapport à un manchon de came (7).
EP10760229.4A 2009-08-10 2010-08-03 Commande pour actionner des soupapes de changement des gaz sur des moteurs à combustion interne Not-in-force EP2464833B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009037269A DE102009037269B4 (de) 2009-08-10 2009-08-10 Ventiltrieb für Verbrennungskraftmaschinen zur Betätigung von Gaswechselventilen
PCT/DE2010/000930 WO2011018073A2 (fr) 2009-08-10 2010-08-03 Commande pour actionner des soupapes de changement des gaz sur des moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP2464833A2 EP2464833A2 (fr) 2012-06-20
EP2464833B1 true EP2464833B1 (fr) 2013-07-24

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Family Applications (1)

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EP10760229.4A Not-in-force EP2464833B1 (fr) 2009-08-10 2010-08-03 Commande pour actionner des soupapes de changement des gaz sur des moteurs à combustion interne

Country Status (5)

Country Link
US (1) US8596238B2 (fr)
EP (1) EP2464833B1 (fr)
JP (1) JP5649237B2 (fr)
DE (1) DE102009037269B4 (fr)
WO (1) WO2011018073A2 (fr)

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DE102009037270B4 (de) 2009-08-10 2011-04-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen
DE102009037268B3 (de) 2009-08-10 2011-04-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variabler Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen
DE102010014249A1 (de) 2010-04-08 2011-10-13 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Vorrichtung zur Verstellung der relativen Drehwinkellage zwischen einer Verstellwelle und einer Nockenhülse
DE102011108728B4 (de) 2011-07-27 2013-02-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen
DE102011054218B4 (de) * 2011-10-06 2023-03-23 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Brennkraftmaschine und Ventiltrieb für eine Brennkraftmaschine
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DE102012008555B4 (de) 2012-04-27 2014-11-27 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Vorrichtung für einen Ventiltrieb zum Umschalten des Hubs von Gaswechselventilen einer Brennkraftmaschine
US9605603B2 (en) * 2013-04-05 2017-03-28 Ford Global Technologies, Llc Position detection for lobe switching camshaft system
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WO2018013464A1 (fr) * 2016-07-14 2018-01-18 Borgwarner Inc. Came de changement de vitesse à arbre d'actionnement interne
WO2020027826A1 (fr) * 2018-08-01 2020-02-06 Borgwarner Inc. Système de distribution pour faire fonctionner un système de soupapes de moteur et procédé associé
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Also Published As

Publication number Publication date
DE102009037269A1 (de) 2011-03-10
JP5649237B2 (ja) 2015-01-07
WO2011018073A2 (fr) 2011-02-17
US8596238B2 (en) 2013-12-03
EP2464833A2 (fr) 2012-06-20
US20120125273A1 (en) 2012-05-24
DE102009037269B4 (de) 2011-06-01
WO2011018073A3 (fr) 2011-04-28
JP2013501872A (ja) 2013-01-17

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