EP2742215B1 - Élément à came(s) pour mécanisme de commande de soupapes - Google Patents

Élément à came(s) pour mécanisme de commande de soupapes Download PDF

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Publication number
EP2742215B1
EP2742215B1 EP12740052.1A EP12740052A EP2742215B1 EP 2742215 B1 EP2742215 B1 EP 2742215B1 EP 12740052 A EP12740052 A EP 12740052A EP 2742215 B1 EP2742215 B1 EP 2742215B1
Authority
EP
European Patent Office
Prior art keywords
cam
cams
undercut
axis
cam element
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
EP12740052.1A
Other languages
German (de)
English (en)
Other versions
EP2742215A1 (fr
Inventor
Michael KUJAS
Thomas Stolk
Alexander Von Gaisberg-Helfenberg
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.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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Filing date
Publication date
Application filed by Daimler AG filed Critical Daimler AG
Publication of EP2742215A1 publication Critical patent/EP2742215A1/fr
Application granted granted Critical
Publication of EP2742215B1 publication Critical patent/EP2742215B1/fr
Active legal-status Critical Current
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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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • 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
    • 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 cam element for a valve drive device according to the preamble of claim 1.
  • the invention is in particular the object of enabling a simple production of the cam member. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.
  • the invention is based on a cam element for a valve drive device of an internal combustion engine, with at least one cam which has at least two partial cams arranged next to one another, which have a common base circle phase in at least one camshaft angle region and for valve lift switching by displacement a cam follower of one of the partial cams are provided on another of the partial cams, the partial cams have an overlapping arrangement.
  • a “cam element” is to be understood in particular a part of a camshaft, which forms a cam for actuating a gas exchange valve.
  • a “cam with juxtaposed partial cam” should be understood in particular a cam having two axially adjacent juxtaposed partial cams, which are intended to actuate the same gas exchange valve differently in different discrete switching positions of the cam member.
  • An operating characteristic of the gas exchange valve is defined by the individual part cam.
  • a "displacement of a cam follower” is to be understood in particular as meaning that a single cam follower, which is provided for picking up a cam contour of the partial cams and for actuating the gas exchange valve, and the partial cams are displaced relative to one another along an axis of rotation of the cam element, wherein the relative Displacement can be done both by an axial movement of the cam member with simultaneous axial fixation of the cam follower or by an axial movement of the cam follower with simultaneous axial fixation of the cam member.
  • By an “overlapping arrangement” is to be understood in particular that the partial cams are only partially superimposed, i. that in any cross sections of a partial cam the other partial cam only partially obscured.
  • “Provided” is to be understood in particular to be specially equipped and / or designed.
  • the cam element has an undercut which is introduced between the two partial cams.
  • Under a "undercut” is in particular a removal of a rotationally symmetrical inner edge with a certain shape and specified dimensions, which gives both the tool used in the production and the adjoining part during assembly the necessary space to be understood, preferably in accordance with DIN 509th Unter "between” should be understood in this context, in particular, that the undercut is arranged along the axis of rotation spatially between the sub-cam.
  • a "production axis” should be understood as meaning, in particular, a virtual axis, with respect to which the undercut has symmetry, in particular rotational symmetry, at least in partial regions.
  • the production axis is displaced with respect to the axis of rotation, preferably in a direction corresponding to a pressure or counter-pressure side of one of the partial cam.
  • the undercut has a truncated cone shape.
  • a "truncated cone” should in particular be understood to mean a shape which corresponds at least substantially to a truncated cone, for example in a longitudinal section through the cam element, wherein the undercut may have a rounded shape relative to a geometrically ideal truncated cone, in particular at edges.
  • a longitudinal section should in particular be understood to mean a section whose section plane extends through the axis of rotation or axis-parallel to the axis of rotation.
  • the undercut at least in the base circle phase merges into the partial cams at a shallow angle.
  • a switchability of the cam follower can be advantageously obtained.
  • a “shallow angle” is to be understood in particular as meaning that an angle which includes a running surface of the cam follower with a surface of the undercut, at least in a transition region between the tread and the undercut is less than 45 °, preferably less than 40 ° and especially is advantageously less than 35 °.
  • valve drive device with a cam element according to the invention and a Ventilhubumschaltü, which is intended to move the cam member along its axis of rotation proposed.
  • a structurally simple valve drive device can be provided with a high efficiency.
  • FIGS. 1 to 3 schematically show an internal combustion engine valve drive device with a cam member 17 according to the invention.
  • the engine valve drive device is provided for an internal combustion engine having at least two cylinders arranged in series, which have different valve actuation times.
  • the engine valve driving apparatus is also applicable to an internal combustion engine in which three, four or more cylinders are arranged in one row, such as a four-cylinder inline engine or a six-cylinder V-engine.
  • the internal combustion engine valve drive device comprises a camshaft 18 with the cam element 17 and a further cam element, which is designed analogously.
  • the cam member 17 is formed as a cam carrier. On the cam elements 17, a cam 10 is arranged, which has two partial cams 11, 12 with different cam contour. The cam member 17 has still more cams, which are formed analogously. The partial cams 11, 12 of the cam 10 are arranged immediately adjacent.
  • the cam member 17 is axially displaceable. By an axial displacement of the cam member 17 is switched within the cam 10 of the one part cam 11, 12 on the other part cam 11, 12.
  • the cam member 17 thus has two discrete switching positions, in which a different valve lift is connected for the cylinder or cylinders associated with the cam element 17.
  • the camshaft 18 comprises a drive shaft 19.
  • the drive shaft 19 comprises a crankshaft connection for connection to a crankshaft, not shown.
  • the crankshaft connection can be formed by means of a camshaft adjuster which is provided to set a phase position between the camshaft 18 and the crankshaft.
  • the cam member 17 is axially displaceable and non-rotatably mounted on the drive shaft 19.
  • the drive shaft 19 has a straight toothing on its outer periphery.
  • the cam member 17 has on its inner circumference a corresponding spur toothing, which engages in the spur toothing of the drive shaft 19.
  • the internal combustion engine valve drive device comprises a switching unit 21, which has two switching pins for engagement in the slide tracks.
  • the switching unit 21 has a stator housing which is fixedly connected to an engine block of the internal combustion engine.
  • the switching pins are slidably disposed in the stator housing along their main extension direction.
  • the slide tracks are designed as grooves in which the switching pins can be forcibly guided on both sides. In a switching operation in the first switching direction, the first switching pin is brought into engagement with the first slide track. In a switching operation in the second switching direction of the second switching pin is brought into engagement with the second slide track.
  • the slide tracks have at least in some areas an axial inclination.
  • rotation of the cam member 17 about its rotational axis 16 causes the shift pin to exert on the cam member 17 an axially acting force that causes the cam member 17 to move along the rotational axis 16.
  • the operative connection of a cam follower, which is provided for tapping the cam contour, is thereby changed from one part cam 11, 12 to the other part cam 11, 12.
  • the cam follower is axially fixed and the cam member 17 is arranged axially displaceable.
  • the two sub-cams 11, 12 have in a camshaft angle range 13 common base circle phase.
  • the cam follower is shifted from the one part cam 11, 12 on the other part cam 11, 12.
  • the two partial cams 11, 12 with respect to the axis of rotation 16 of the cam member 17 on a substantially same radial extent.
  • the partial cams 11, 12 of the cam 10 have an overlapping arrangement.
  • the first part cam 11 has a radial extent that is greater than a radial extent that the second partial cam 12 has in this camshaft angle range 22.
  • a valve lift provided by the first part cam 11 is greater than a valve lift provided by the second part cam 11.
  • the second part cam 12 has a radial extension that is greater than a radial extent that the first part cam 11 has in this camshaft angle region 23.
  • a valve lift provided by the second part cam 12 is greater than a valve lift provided by the first part cam 11.
  • the second part cam 12 is thus not completely within a radial envelope, which is spanned by the first part cam 11.
  • the first part cam 11 is not in a radial envelope, which is spanned by the second part cam 12.
  • the cam member 17 has an undercut 14 which is introduced between the two partial cams 11, 12.
  • the undercut 14 is introduced into the cam element 17 by a machining process, in particular a milling and / or twisting method.
  • the undercut 14 extends over an entire outer circumference of the cam element 17. It is introduced into the outer circumference of the cam element 17 as an outer free groove.
  • the undercut 14 has a production axis 15, which is arranged offset from the axis of rotation 16 of the cam member 17.
  • the undercut 14 has a symmetry with respect to the production axis 15.
  • the undercut 14 is rotationally symmetrical with respect to the production axis 15, ie.
  • the cam member 17 is rotated about the production axis 15.
  • the production axis 15 is displaced axially parallel to the axis of rotation 16.
  • the undercut 14 has a truncated cone shape.
  • a surface of the cam member 17 extends parallel to the production axis 15.
  • the free groove 14 at least in the base circle phase at a shallow angle in the partial cams 11, 12, ie an angle, the one provided for the cam follower Running surface of the part cam 11, 12 includes with the surface in the region of the undercut 14 is always less than 45 °.
  • the angle is between 10 ° and 30 °.
  • the undercut 14 is first introduced between the two partial cams 11, 12.
  • the undercut 14 is introduced in a machining process.
  • the two partial cams 11, 12 are formed individually.
  • the partial cams 11, 12 are ground individually after introduction of the undercut 14 with grinding tools whose width is only slightly larger than a width of the individual partial cams 11, 12.
  • An order in which the partial cams 11, 12 are ground is arbitrary.

Landscapes

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

Claims (4)

  1. Élément à came pour un mécanisme de commande de soupape d'un moteur à combustion interne, comprenant au moins une came (10), qui présente au moins deux cames partielles (11, 12) adjacentes l'une à l'autre, qui dans au moins une zone d'angle d'arbre à came (13) présentent une phase de cercle de base commune et sont prévues pour une inversion de levée de soupape par le déplacement d'un galet suiveur ou d'une came (10), de manière que le galet suiveur soit en contact avec l'une des cames partielles (11, 12) ou une autre came partielle parmi les cames partielles (11, 12), les cames partielles (11, 12) présentant un agencement de chevauchement, et entre les deux cames partielles (11, 12) étant introduite une rainure de dégagement (14), qui présente un axe de production (15) qui est désaxé par rapport à un axe de rotation (16).
  2. Élément de came selon la revendication 1, caractérisé en ce que la rainure de dégagement (14) présente une forme tronconique.
  3. Élément de came selon la revendication 1, caractérisé en ce que la rainure de dégagement (14) au moins dans la phase de cercle de base dépasse selon un angle plat dans la came partielle (11, 12).
  4. Mécanisme de commande de soupapes comprenant un élément de came (17) selon l'une quelconque des revendications précédentes et une unité d'inversion de levée de soupape destinée à déplacer l'élément de came (17) le long de son axe de rotation (16).
EP12740052.1A 2011-08-09 2012-07-17 Élément à came(s) pour mécanisme de commande de soupapes Active EP2742215B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011109764A DE102011109764A1 (de) 2011-08-09 2011-08-09 Nockenelement für eine Ventiltriebvorrichtung
PCT/EP2012/003001 WO2013020635A1 (fr) 2011-08-09 2012-07-17 Élément à came(s) pour mécanisme de commande de soupapes

Publications (2)

Publication Number Publication Date
EP2742215A1 EP2742215A1 (fr) 2014-06-18
EP2742215B1 true EP2742215B1 (fr) 2015-09-16

Family

ID=46581890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12740052.1A Active EP2742215B1 (fr) 2011-08-09 2012-07-17 Élément à came(s) pour mécanisme de commande de soupapes

Country Status (6)

Country Link
US (1) US9046011B2 (fr)
EP (1) EP2742215B1 (fr)
JP (1) JP2014521876A (fr)
CN (1) CN103717848B (fr)
DE (1) DE102011109764A1 (fr)
WO (1) WO2013020635A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6432435B2 (ja) * 2015-04-24 2018-12-05 いすゞ自動車株式会社 カム切替装置
EP3292280B1 (fr) * 2015-05-05 2021-03-10 Volkswagen Aktiengesellschaft Système de distribution
DE102015014175A1 (de) * 2015-11-03 2017-05-04 Daimler Ag Ventiltriebvorrichtung
WO2017079383A1 (fr) 2015-11-06 2017-05-11 Borgwarner Inc. Système d'actionnement de soupape offrant une levée de soupape variable et/ou un réglage de soupape variable
DE102019005036A1 (de) 2019-07-18 2021-01-21 Neumayer Tekfor Engineering Gmbh Nocken für eine Nockenwelle

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963339A (ja) * 1982-10-04 1984-04-11 Nissan Motor Co Ltd 気筒数制御エンジン
JPS59232760A (ja) * 1983-06-16 1984-12-27 Nissan Motor Co Ltd 内燃機関のカム研削方法
JPS62712U (fr) * 1985-06-19 1987-01-06
DE19519048A1 (de) * 1995-05-24 1996-11-28 Hermann Prof Dr Ing Krueger Variabler Ventiltrieb mit mehreren Nocken
JP2004036662A (ja) * 2002-06-28 2004-02-05 Musashi Seimitsu Ind Co Ltd カムシャフト
DE102005025440B4 (de) 2005-06-02 2018-04-05 Waters Gmbh System und Verfahren zur Probenvorbereitung
DE102007022145A1 (de) * 2006-07-26 2008-01-31 Schaeffler Kg Umschaltbarer Ventiltrieb einer Brennkraftmaschine
DE102007010148A1 (de) * 2007-03-02 2008-09-04 Audi Ag Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit einem axial beweglichen Lager
JP4741541B2 (ja) * 2007-03-30 2011-08-03 本田技研工業株式会社 エンジンの動弁装置
DE102007037745A1 (de) * 2007-08-10 2009-02-12 Daimler Ag Brennkraftmaschinenventiltriebumschaltvorrichtung
DE102008036030A1 (de) * 2008-08-01 2010-02-04 Daimler Ag Ventiltriebvorrichtung
DE102008050776A1 (de) 2008-10-08 2010-04-15 Daimler Ag Ventiltriebvorrichtung
DE102010004591B4 (de) * 2010-01-14 2021-08-19 Audi Ag Gebauter Nockenträger für Ventiltrieb

Also Published As

Publication number Publication date
CN103717848B (zh) 2016-06-29
EP2742215A1 (fr) 2014-06-18
US20140150743A1 (en) 2014-06-05
JP2014521876A (ja) 2014-08-28
CN103717848A (zh) 2014-04-09
DE102011109764A1 (de) 2013-02-14
WO2013020635A1 (fr) 2013-02-14
US9046011B2 (en) 2015-06-02

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