WO2013060405A1 - Distribution dans moteur a combustion interne - Google Patents

Distribution dans moteur a combustion interne Download PDF

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Publication number
WO2013060405A1
WO2013060405A1 PCT/EP2012/003966 EP2012003966W WO2013060405A1 WO 2013060405 A1 WO2013060405 A1 WO 2013060405A1 EP 2012003966 W EP2012003966 W EP 2012003966W WO 2013060405 A1 WO2013060405 A1 WO 2013060405A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
cam piece
locking element
piece
camshaft
Prior art date
Application number
PCT/EP2012/003966
Other languages
German (de)
English (en)
Inventor
Thomas Stolk
Alexander Von Gaisberg-Helfenberg
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2013060405A1 publication Critical patent/WO2013060405A1/fr

Links

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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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

Definitions

  • the invention relates to a valve drive for an internal combustion engine according to the preamble of claim 1.
  • the locking of the cam pieces against unintentional axial displacement on the camshaft takes place by means of a spring-loaded detent element, which is arranged radially in the camshaft, and engages in latching contours in the cam piece.
  • the cam piece is thereby displaced beyond the force of the spring.
  • the disadvantage here is that the locking element is constantly effective via a spring and the latching mechanism must be overcome at each initiation of the displacement of the cam piece, with the result that increased displacement forces are required. This leads to premature wear.
  • the switching elements, latching contours and the locking element must therefore be dimensioned larger, resulting in increased weight, volume and energy consumption.
  • a valve train in which the cam piece has a plurality of different cam contours, which are in operative connection with a lift valve. The different cam contours are adjusted by axial displacement of the cam piece on the camshaft.
  • a locking element secures the cam pieces against unwanted axial displacement on the camshaft.
  • the locking element is designed as a two-part, substantially cylindrical pin, whose parts are arranged radially in the camshaft or in the interior of the cam piece. One part of the pin stands by means of one inside the camshaft arranged spring under bias against the other part of the pin, which protrudes beyond the contour of the cam piece.
  • the locking element is pushed inwards against the force of the spring by a roller picker located between the lift valve and the cam, thus unlocking it, even if there is no displacement. This leads to increased wear of the locking mechanism and unnecessary noise.
  • the cam piece temporarily unguided in the axial direction, which can lead to unwanted displacement of the cam piece on the camshaft, for example by vibrations.
  • the locking element can even be in an unlocked position and the cam piece so that it can be displaced by external shocks, eg rail transport of a vehicle with this engine unintentionally.
  • the invention has for its object to provide a valve train for an internal combustion engine, the locking mechanism has a lower wear and increased reliability.
  • the valve train according to the invention consists of a camshaft, which consists of a support shaft with at least one rotatable and axially displaceable on the support shaft cam piece, which is displaceable by a switching element which engages in a shift gate.
  • the cam piece is displaceable by the contour of the shift gate from a first axial end position to a second axial end position and durable by a locking element in these end positions.
  • the locking element is unlocked exclusively during axial displacement of the cam piece and locked exclusively in the region of the end positions of the cam piece. The displacement forces are therefore very low, resulting in lower construction volume, longer life, lower costs and low noise.
  • the cam pieces are locked, except when displaced on the carrier shaft, so that no undesired shifting of the cam pieces can occur, e.g. due to vibrations or vibrations.
  • the cam pieces are thus guided axially at all times, in the end positions by the locking element, when moving through the switching element, which engages in the shift gate.
  • a particularly safe valve train is obtained when the locking element unlocked when operating the switching element and automatically locked when reaching the end positions of the cam piece.
  • the locking element of a bolt for example, a locking bolt, a spring, a guide, which may be formed as a cylindrical protuberance, and at least two detent openings formed.
  • the switching element comprises an actuator and an example designed as an actuating pin actuator.
  • the mechanical coupling of the switching element and the locking element is most easily formed from a rocker and a connecting piece.
  • Fig. 1 detail of the valve train for an internal combustion engine in partial
  • FIG. 2 shows a detail of the valve drive as in FIG. 1 in a second end position.
  • the valve train according to the invention comprises a camshaft 22, which consists of a carrier shaft 1, which is mounted in at least two camshaft bearings 2a, 2b corresponding left and right.
  • the carrier shaft 1 has at least one cam piece 3 per cylinder of the internal combustion engine, which consists of a central part 15 and on each of the left and right end subsequent cam sections 10, 11, followed by a respective shift gate 5a; 5b.
  • Each shift gate 5a; 5b has a switching contour 12a; 12b, for example in the form of a helical circumferential groove whose groove depth is variable.
  • the switching contour 12b shown on the left in FIG. 1 has a helical shape to the right or to the inner cam portion 10 or to the cam contours 10a, 10b Groove.
  • the switching contour 12a shown on the right also runs mirror-symmetrically from right to left towards the cam contours 11a, 11b.
  • the cam sections 10, 11 each have two different cam contours 10a, 10b; 11a, 11b.
  • the cam contours 10a, 10b; 11a, 11b have different outer contours and thus cause different operating characteristics for gas exchange valves.
  • To the cam portions 10, 11 engage takers or cam follower, for example in the form of rocker arms 17a; 17b, actuate the appropriate gas exchange valves.
  • these are intake valves, but it is also possible to connect exhaust valves with the valve drive according to the invention. Due to the different operating characteristics of the gas exchange valves can be adjusted depending on the power requirements of the engine different valve strokes.
  • the cam piece 3 is rotatably connected to the support shaft 1 and axially displaceable by means of a spline, not shown.
  • the inside provided for longitudinal toothing of the cam piece 3 engages in a corresponding external toothing of the support shaft 1, so that longitudinal displacements of the cam piece 3 on the support shaft 1 are possible, but in the circumferential direction a rotationally fixed connection.
  • the valve train according to the invention has two switching elements 26a, 26b, each with an actuator 4a; 4b, which is, for example, electromagnetically actuated.
  • the actuator 4a; 4b shifts an axially extending to the cam piece 3 actuator, such as an actuating pin 18a; 18b, which then into the switching contour 12a; 12b of the shift gate 5a; 5b engages.
  • the engagement of the actuating element 18a, 18b is possible only in a certain position of the shift gates 12a, 12b.
  • the respective switching position is specified via a locking element 6.
  • the locking element 6 fixes the cam piece 3 on the support shaft 1 for this purpose in two end positions by the locking element 6 engages in two, the end positions exactly associated latching openings 7a, 7b in the support shaft 3.
  • the latching openings 7a, 7b holes, grooves or the like.
  • the locking element 6 is, for example, shown as a bolt guided radially to the carrier shaft 1 in a cylindrical protuberance 23 in the cam piece 3, for example locking bolt 19, which displaces against a force of a spring 9 housed in the cylindrical protuberance 23 into the cylindrical protuberance 23. is rerable.
  • the locking element 6 projects out of the cam piece 3, where according to the invention there is an operative connection of the bolt 19 with the actuators 4 a, 4 b, for example via a mechanical coupling.
  • the operative connection can be embodied in the form of a direction-reversing element, exemplified by rockers 13, 14, which convert a movement of the actuating element 18a, 18b towards the cam piece 3 into a movement of the bolt 19 away from the carrier shaft 1, so that an unlocking takes place.
  • the rockers 13, 14 each consist of a bearing 25a; 25b and two levers 13a, 13b, respectively; 14a, 14b.
  • the levers 13a, 14a of the rockers 13, 14 are loosely on a connecting piece 24 on the latch 19 and the lever 13b, 14b of the rockers 13, 14 are fixedly connected to the actuating element 18a, 18b.
  • the connecting piece 24 is connected to the latch 19 in such a way that the latch 19 is fixedly connected axially to the connecting piece 24 and permits a displacement parallel to the carrier 1 of the bolt 19 in the connecting piece 24.
  • the illustrated active compound is to be seen only as an example. There are also other direction reversing elements used or another locking mechanism conceivable.
  • the locking element 6 fixes the cam piece 3 on the support shaft 1 in the first end position.
  • the following describes how the cam piece 3 enters its second end position shown in FIG.
  • the cam piece 3 is displaced axially by the actuation of the left switching element 26b on the carrier shaft 1 in the second, shown in FIG. 2 end position by the actuator 18b engages in the direction of arrow 20 in the shift gate 5b in the cam piece 3 and the switching contour 12b of the shift gate 5b follows.
  • the actuating element 18b is deactivated by the shift gate 5b, by reducing the depth of the groove of the switching contour 5b, pushing the actuating element 18b back into its starting position.
  • the latch 19 is only completely unlocked from the latching opening 7a, when the actuator 18b has reached its end position in the switching contour 12b, adjacent to this.
  • the locking takes place in the then reached, second end position, as shown in Fig. 2, by the spring 9, the bolt 19th in the left illustrated, second detent opening 7b in the support shaft 1 presses.
  • This takes place in the deactivated state of the actuating element 18b, in which a movement of the left lever 13b of the rocker 13 away from the cam piece 3 and the movement of the right lever 13a of the rocker 13 to the cam piece 3 and thereby releases the latch 19.

Landscapes

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

Abstract

Le réglage de différents contours de cames (10a; 10b; 11a; 11b) par glissement axial de cames (3) sur l'arbre à cames (22) est connu. L'inconvénient est qu'un élément d'arrêt sous forme de ressort agit en permanence et que le mécanisme d'arrêt doit être surmonté à chaque début de glissement d'une came (3) ce qui nécessite des forces de déplacement accrues. L'invention vise à réduire l'usure et à augmenter la sécurité de fonctionnement. A cet effet, l'élément de verrouillage (6) ne se déverrouille que pour le glissement axial d'une came (3) et il ne se verrouille que dans la zone de la position finale prise par la came (3). L'invention concerne des distributions pour moteurs à combustion interne.
PCT/EP2012/003966 2011-10-27 2012-09-21 Distribution dans moteur a combustion interne WO2013060405A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011117244.4A DE102011117244B4 (de) 2011-10-27 2011-10-27 Ventiltrieb für eine Brennkraftmaschine
DE102011117244.4 2011-10-27

Publications (1)

Publication Number Publication Date
WO2013060405A1 true WO2013060405A1 (fr) 2013-05-02

Family

ID=46968132

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/003966 WO2013060405A1 (fr) 2011-10-27 2012-09-21 Distribution dans moteur a combustion interne

Country Status (2)

Country Link
DE (1) DE102011117244B4 (fr)
WO (1) WO2013060405A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016210975A1 (de) * 2016-06-20 2017-12-21 Mahle International Gmbh Ventiltrieb für eine Brennkraftmaschine
US10385738B2 (en) 2015-09-18 2019-08-20 Avl List Gmbh Variable valve control device for internal combustion engines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013112539A1 (de) 2013-11-14 2015-05-21 Thyssenkrupp Presta Teccenter Ag Verstellbare Nockenwelle
DE102014001568B3 (de) * 2014-02-05 2015-03-26 Audi Ag Verfahren zum Betreiben einer Brennkraftmaschine sowie entsprechende Brennkraftmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1445653A (en) * 1920-07-24 1923-02-20 Watson Chester Roy Internal-combustion engine
DE4230877A1 (de) * 1991-09-30 1993-04-01 Volkswagen Ag Ventilsteuerung fuer ein hubventil mit zwei nocken
DE19702389A1 (de) 1997-01-24 1998-07-30 Audi Ag Ventiltrieb für eine Brennkraftmaschine
DE19908286A1 (de) * 1999-02-26 2000-08-31 Porsche Ag Variable Ventilsteuerung für Brennkraftmaschinen
DE102004056290A1 (de) 2004-11-22 2006-06-01 Audi Ag Ventiltrieb einer Brennkraftmaschine mit mindestens einer Grundnockenwelle
DE102006012386B3 (de) * 2006-03-15 2007-08-30 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für eine Brennkraftmaschine
DE102009005731A1 (de) * 2009-01-22 2010-08-05 Audi Ag Ventiltrieb für Gaswechselventile mit geneigter und/oder Doppel-Kugelraste

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008007255A1 (de) * 2007-02-23 2008-08-28 Schaeffler Kg Schaltbarer Ventiltrieb für Ladungswechselventile von Brennkraftmaschinen
DE102009017242B4 (de) * 2009-04-09 2011-09-22 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1445653A (en) * 1920-07-24 1923-02-20 Watson Chester Roy Internal-combustion engine
DE4230877A1 (de) * 1991-09-30 1993-04-01 Volkswagen Ag Ventilsteuerung fuer ein hubventil mit zwei nocken
DE19702389A1 (de) 1997-01-24 1998-07-30 Audi Ag Ventiltrieb für eine Brennkraftmaschine
DE19908286A1 (de) * 1999-02-26 2000-08-31 Porsche Ag Variable Ventilsteuerung für Brennkraftmaschinen
DE102004056290A1 (de) 2004-11-22 2006-06-01 Audi Ag Ventiltrieb einer Brennkraftmaschine mit mindestens einer Grundnockenwelle
DE102006012386B3 (de) * 2006-03-15 2007-08-30 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für eine Brennkraftmaschine
DE102009005731A1 (de) * 2009-01-22 2010-08-05 Audi Ag Ventiltrieb für Gaswechselventile mit geneigter und/oder Doppel-Kugelraste

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10385738B2 (en) 2015-09-18 2019-08-20 Avl List Gmbh Variable valve control device for internal combustion engines
DE102016210975A1 (de) * 2016-06-20 2017-12-21 Mahle International Gmbh Ventiltrieb für eine Brennkraftmaschine

Also Published As

Publication number Publication date
DE102011117244B4 (de) 2023-08-10
DE102011117244A1 (de) 2013-05-02

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