EP1350928B1 - Appareil pour actionnement variable d'une soupape d'un moteur à combustion interne - Google Patents

Appareil pour actionnement variable d'une soupape d'un moteur à combustion interne Download PDF

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Publication number
EP1350928B1
EP1350928B1 EP03007234A EP03007234A EP1350928B1 EP 1350928 B1 EP1350928 B1 EP 1350928B1 EP 03007234 A EP03007234 A EP 03007234A EP 03007234 A EP03007234 A EP 03007234A EP 1350928 B1 EP1350928 B1 EP 1350928B1
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EP
European Patent Office
Prior art keywords
valve
linear cam
cam
counter element
pivoted lever
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.)
Expired - Lifetime
Application number
EP03007234A
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German (de)
English (en)
Other versions
EP1350928A3 (fr
EP1350928A2 (fr
Inventor
Willi Roth
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Individual
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Publication of EP1350928A3 publication Critical patent/EP1350928A3/fr
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Publication of EP1350928B1 publication Critical patent/EP1350928B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/20—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
    • 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
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • 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
    • F01L13/0063—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 cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a device for the variable actuation of a lift valve, in particular an inlet and / or exhaust valve of an internal combustion engine, arranged with a in the drive train between an oscillating actuator and the lift valve, reciprocating linear cam, on the one hand with a stationary in terms of valve lift Counter-organ and on the other hand with a movable in the sense of the valve lift, drivingly connected to the lifting valve counter-member and provided with at least one lifting movement of the movable in the sense of the valve lift counter-member control cam, wherein the lifting movement by a reciprocating movement in the sense of Linear cam takes place relative movement between the linear cam and at least one control cam associated counter-member is variable.
  • the linear cam is designed as a sliding shoe, which rests with a sliding surface on an actuator acting on the lifting valve and having a contact surface cooperating with an associated cam of a camshaft and an opposite control cam, the cooperates with a sensing roller, which is fixed in height and arranged adjustable in the direction of reciprocating movement of the linear cam.
  • the linear cam is reliably guided and secured in any case here as a result of its articulation to the pivot lever, so that when the valve is closed game against the stationary or movable counter-member can be allowed, which simplifies the Bewerk Trentologist a mode of zero stroke to maximum stroke and vice versa and ensures high reliability even at high speeds.
  • the adjustability of the pivot axis and / or the pivot angle of the pivot lever and thus the linear cam allows advantageously in the sense of reciprocating motion of the linear cam stationary arrangement of both counter organs, which results in a simple and compact design and ensures a gentle operation. With adjustable pivot angle of the pivot lever whose pivot axis can be arranged stationary.
  • the pivot lever advantageous on a rotatable Be mounted eccentric shaft, which is rotatable for the radial adjustment of the pivot bearing.
  • a rotational movement of the eccentric shaft can be accomplished comparatively easily and accurately in an advantageous manner.
  • a high degree of robustness results.
  • the eccentric shaft can pass through the engine length in an engine and record the lift valves associated with the engine in the longitudinal direction of successively arranged cylinder pivot lever. This results in a particularly simple and compact design, making do with an eccentric shaft and an associated actuator.
  • a further advantageous measure may be that the counter-member, which is movable in the sense of the valve lift, is accommodated on a rocker arm, which cooperates with the lifting valve and is pivotably mounted.
  • the rocker arm can be pivotally mounted in a proven field on a so-called hydraulic base, which in turn is accommodated in a rotatable eccentric bushing.
  • a control cam of the linear cam can be assigned to the counter-member movable in the sense of the valve lift.
  • the control cam may have a locking portion extending substantially parallel to an opposite support curve, a subsequent thereto ramp section and a subsequent lifting section.
  • the locking portion is assigned to a mode of operation with zero stroke.
  • the lifting section accomplishes the stroke of the associated lift valve.
  • the ramp portion provided therebetween provides a slow opening and closing movement of the lift valve, so that bumps and noise and any rebounding of the lift valve are reliably prevented.
  • the counter-member stationary in the sense of the valve lift is expediently assigned a support curve of the linear cam opposite the control cam, which is expediently designed so that it alone does not cause valve lift and that between the linear cam and the counter organs at any position of the adjustable pivot bearing game existing with the lift valve closed the pivot lever is substantially equal. This results in a gentle operation with the required accuracy.
  • a further expedient measure may be that the axis of the eccentric shaft is arranged in a plane with the axis of a camshaft provided as an actuator device. Said plane may be formed as a parting line of the housing, which facilitates the mounting of the eccentric shaft and the camshaft.
  • an adjustable stroke actuator e.g. a linear motor
  • a camshaft is dispensable in an advantageous manner.
  • Main field of application of the invention are formed as gasoline engines reciprocating engines, preferably in the form of motor vehicle engines.
  • the basic structure and operation of such engines are known per se and therefore need no further explanation in the present context.
  • the engine underlying the figure 1 has a plurality of cylinders 1 arranged in series one behind the other, which are provided with inlet and outlet channels 2, which are each up by a lift valve 3 and ab facedbar.
  • the lifting valve 3 has a valve seat 5 cooperating with a valve seat 4, from which a shaft 6 projects, which is mounted in a housing-side bearing bush 7 and acts on the upper end of a valve actuator.
  • camshaft 8 This contains here acting as an actuator device, drivable in a known manner camshaft 8, which is provided with the actuated valves 3 associated cam 9.
  • the camshaft 8 is suitably placed so that its axis coplanar to the axes of the associated valves 3 is.
  • the valve actuator further includes a two-armed pivot lever 10, which at its the camshaft 8 facing, here upper end cooperating with the associated cam 9 of the camshaft 8 sensing roller 11 and at the opposite, here lower end a linear cam 12 is pivotally articulated by means of a pivot bearing ,
  • the pivot lever 10 is suitably associated with an auxiliary spring not shown here, which holds the follower roller 11 in abutment with the associated cam 9 of the camshaft 8.
  • the hinged to the lower end of the pivot lever 10 linear cam 12 engages with a wedge-like region between two counter-organs in the form of a motor housing on all sides stationarily mounted roller 13 and one of these opposite, movable in the sense of the lifting movement of the valve 3 roller 14 a.
  • This is rotatably mounted on a rocker arm 15 designed as a one-armed rocker arm, which in turn is pivotally mounted at its valve distal end and acts with its opposite end to the upper end of the valve stem 6.
  • the oscillating cam 9 of the rotating camshaft 8 causes a pivoting movement of the pivoting lever 10, which in turn causes a reciprocating movement of the linear cam 12. Since this is supported with its upper edge to the stationary mounted in the housing roller 13, causes between the rollers 13, 14 engaging, wedge-shaped section an evasive movement of the mounted on the tiltable rocker arm 15, lower roller 14 and thus a tilting movement of the finger lever 15, which is transmitted to the valve 3 and a corresponding valve lift causes. In the course of the here to the left forward movement of the linear cam 12, the valve 3 is opened against the force of an only schematically indicated return spring 16, which tracks and closes the valve 3 in the backward movement of the linear cam 12.
  • the linear cam 12 is adjusted so that it is in the constant-stroke reciprocating motion with its wedge-shaped region more or less far between than Counter-organs acting rollers 13 and 14 is retracted.
  • the axis of the pivot lever 10 is displaced in the radial direction parallel to itself, as indicated in Figure 1 at a.
  • the engagement of the linear cam 12 between the associated counter-organs can also be changed by changing the pivoting angle of the pivoting lever 10.
  • a linear motor carrying out a reversing movement for example informing a hydraulic or pneumatic cylinder or an electric lifting magnet, etc., whose stroke, e.g. is variable depending on the desired filling.
  • camshaft 8 ie, the axis of the camshaft 8, similar to the axis of the pivot lever 10 in the radial direction to move parallel to itself.
  • the pivot lever 10 is mounted on an eccentric shaft 17 parallel to the camshaft 8, which is rotatable to accomplish the desired displacement of the pivot bearing axis of the pivot lever 10.
  • the eccentric shaft 17, as best seen in FIG. 2, expediently extends through the length of the associated engine and accommodates all the lifting valves 3 of the pivoting levers 10 associated with the cylinder 1 arranged one behind the other.
  • the eccentric shaft 17 is rotatable depending on the position of a charge control member, for example, the accelerator pedal of a motor vehicle.
  • a charge control member for example, the accelerator pedal of a motor vehicle.
  • the eccentric shaft 17 is provided for this purpose with a pivot arm 18 on which an actuatable by means of the gas pedal linkage 19 engages.
  • a servo drive in the form of a control motor which can be influenced by means of the accelerator pedal, etc.
  • the eccentric shaft 17 and the camshaft 8 are, as the figures 1 and 2 can be seen further, arranged coplanar.
  • the motor housing is, as best seen in Figure 1, divided along this plane.
  • the parting line 20 thus formed facilitates the housing-side mounting of the camshaft 8 and the eccentric shaft 17th
  • the generally stationary, only rotatable roller 13 facing upper edge of the linear cam 12 is formed as a support curve 21, which causes no valve lift in cooperation with the associated roller 13.
  • the support curve 21 has an upwardly concave curved contour.
  • the control cam 22 has a downwardly concave curved contour, wherein in the front, that is remote from the articulation on the pivot lever 10 an approximately parallel course of support curve 21 and cam 22 may be provided.
  • the control cam 22 includes, as best seen in Figure 3, three adjoining areas, namely a front, that is away from the storage detent portion 23, a subsequent thereto ramp section 24 and a subsequent thereto, the storage facing the lifting section 25.
  • Der Locking portion 23 has, as already mentioned, to the front region of the opposite support curve 21 in approximately parallel or only slightly diverging course.
  • control cam 22 opposite support curve 21 is formed so that, as already mentioned above, alone causes no lift of the valve. This facilitates the configuration of the cam 22.
  • the support curve 21 is designed so that the present with the lift valve clearance between the linear cam 12 and the associated counter organs acting as rollers 13, 14 at each position of the adjustable pivot bearing of the pivot lever 10 substantially the same remains.
  • the drag lever 15 consists, as can be seen from Figure 2, of two parallel side legs 15a, b, which, as Figure 1 shows, are connected by a rear and front yoke. Between the side legs 15a, b of the linear cam 12 and the associated as this counter organs acting rollers 13, 14 engage, resulting in a very compact arrangement.
  • the front yoke is, as Figure 1 shows, as at the upper end of the valve stem 6 adjacent, spherical web 26 is formed.
  • the rear yoke is, as Figure 1 further shows, formed as a bearing cup 27, with which the drag lever 15 is mounted on the bearing head of a bearing socket 28 received in the housing.
  • the bearing head is automatically adjusted in the axial direction so far that a valve clearance compensation is achieved.
  • the bearing base 28 is received in an eccentric bushing 29, which allows a transverse to the base axis adjustment of the paint base 28.
  • the drag lever 15 so can the pivot lever 10, as can be seen from Figure 2, two parallel side legs 10a, b, which receive the sensing roller 11 and the linear cam 12 between them.

Landscapes

  • 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 (11)

  1. Dispositif pour l'actionnement variable d'une soupape à levée rectiligne (3), en particulier d'une soupape d'admission et/ou d'échappement d'un moteur à combustion interne, avec une came linéaire (12) qui peut être actionnée d'un mouvement de va-et-vient et qui est disposée dans le train d'entraînement entre un dispositif actionneur oscillant (8, 9) et ladite soupape à levée rectiligne (3), ladite came linéaire agissant de concert, d'un côté, avec un contre-organe (13) stationnaire dans le sens de la levée de la soupape et, de l'autre côté, avec un contre-organe (14) mobile dans le sens de la levée de la soupape et relié à entraînement à la soupape à levée rectiligne (3), et étant pourvue d'au moins une courbe de commande (22) effectuant un mouvement de levée dudit contre-organe (14) mobile dans le sens de la levée de la soupape, le mouvement de levée du contre-organe (14) pouvant être varié par un mouvement relatif entre ladite came linéaire (12) et au moins un contre-organe (14) associé à une courbe de commande (22) de la came linéaire (12), ledit mouvement relatif se faisant dans le sens du mouvement de va-et-vient de la came linéaire (12), caractérisé par le fait que ladite came linéaire (12) est articulée à pivotement sur un levier pivotant (10) qui peut être actionné par le dispositif actionneur (9) et est, de son côté, réglable, et peut être influencée par un réglage dudit levier pivotant (10) dans son mouvement relatif par rapport aux contre-organes (13, 14), et que la came linéaire (12) présente une courbe d'appui (21) et une courbe de commande (22) qui se trouve en regard et qui présente une portion avant de repos (23) s'étendant pour l'essentiel parallèlement à ladite courbe d'appui (21), une portion à rampe (24) contiguë à cette première ainsi qu'une portion de levée (25) qui suit cette dernière.
  2. Dispositif selon la revendication 1, caractérisé par le fait que le palier pivotant dudit levier pivotant (10) peut être réglé transversalement à son axe.
  3. Dispositif selon la revendication 2, caractérisé par le fait que le levier pivotant (10) est logé sur un arbre excentrique rotatif (17) qui, pour déplacer le palier pivotant du levier pivotant (10), peut être tourné de préférence en fonction de la position d'un organe de commande de remplissage.
  4. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que la courbe de commande (22) de la came linéaire (12) est associée au contre-organe (14) mobile dans le sens de la levée de la soupape, et que la courbe d'appui (21) de la came linéaire (12), qui est située en regard de la courbe de commande (22), est associée au contre-organe (13) stationnaire dans le sens de la levée de la soupape.
  5. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que le contre-organe (14) mobile dans le sens de la levée de la soupape est reçu sur un levier oscillant agissant de concert avec la soupape à levée rectiligne (3) et logé à pivotement, et que le contre-organe (13) qui est associé à la courbe d'appui (21) est disposé de façon stationnaire de tout côté.
  6. Dispositif selon la revendication 5, caractérisé par le fait que ledit levier oscillant (15) présente des branches latérales (15a, 15b) qui sont reliées par le biais de jougs et entre lesquelles s'engagent la came linéaire (12) ainsi que les contre-organes (13, 14) associés à celle-ci et réalisés de préférence en tant que rouleaux logés de façon rotative.
  7. Dispositif selon l'une des revendications précédentes 5 ou 6, caractérisé par le fait que ledit levier oscillant (15) est logé à pivotement sur un socle de logement (28) qui est réglable au moins dans la direction de son axe et qui, de préférence, est reçu dans une douille excentrique rotative (29).
  8. Dispositif selon l'une des revendications précédentes 3 à 7, caractérisé par le fait que, dans un moteur, l'arbre excentrique (17) s'étend sur l'ensemble de la longueur du moteur et reçoit les leviers pivotants (10) associés aux soupapes à levée rectiligne à actionner (3) des cylindres (1) disposés les uns derrière les autres dans la direction longitudinale du moteur, et que l'axe de l'arbre excentrique (17) est disposé dans un plan avec l'axe d'un arbre à cames (8) qui forme ledit dispositif actionneur, s étend sur toute la longueur du moteur et est pourvu de cames (9) associées aux soupapes à levée rectiligne (3) à actionner, de préférence chacun des leviers pivotants (10) présentant un rouleau palpeur (11) qui s'appuie sur la came (9) respectivement associée de l'arbre à cames (8).
  9. Dispositif selon l'une des revendications 1 et 4 à 7, caractérisé par le fait que l'angle de pivotement du levier pivotant (10) est réglable.
  10. Dispositif selon la revendication 9, caractérisé par le fait que ledit dispositif actionneur (8, 9) est réalisé de manière à pouvoir modifier sa course.
  11. Dispositif selon l'une des revendications 9 ou 10, caractérisé par les caractéristiques de l'une au moins des revendications précédentes 3, 4, 5, 6, 7.
EP03007234A 2002-04-06 2003-04-01 Appareil pour actionnement variable d'une soupape d'un moteur à combustion interne Expired - Lifetime EP1350928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10215281A DE10215281A1 (de) 2002-04-06 2002-04-06 Vorrichtung zum stufenlosen Variieren der Ventilerhebung in Verbrennungsmotoren
DE10215281 2002-04-06

Publications (3)

Publication Number Publication Date
EP1350928A2 EP1350928A2 (fr) 2003-10-08
EP1350928A3 EP1350928A3 (fr) 2003-12-10
EP1350928B1 true EP1350928B1 (fr) 2006-09-27

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Application Number Title Priority Date Filing Date
EP03007234A Expired - Lifetime EP1350928B1 (fr) 2002-04-06 2003-04-01 Appareil pour actionnement variable d'une soupape d'un moteur à combustion interne

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EP (1) EP1350928B1 (fr)
DE (2) DE10215281A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10261304B4 (de) * 2002-12-27 2009-01-22 BÖSL-FLIERL, Gerlinde Ventilhubvorrichtung zur variablen Ventilsteuerung der Gaswechselventile einer Verbrennungskraftmaschine
DE10303128A1 (de) * 2003-01-28 2004-07-29 Fev Motorentechnik Gmbh Vollvariabler mechanischer Ventiltrieb für eine Kolbenbrennkraftmaschine mit justierbarem Ventilspielausgleich
DE102005035315B4 (de) * 2005-07-28 2007-05-10 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variabler Ventiltrieb für Verbrennungskraftmaschinen
JP2007127117A (ja) * 2005-10-04 2007-05-24 Masaaki Yoshikawa ４ストローク内燃機関の動弁系装置
US7363893B2 (en) * 2005-12-05 2008-04-29 Delphi Technologies, Inc. System for variable valvetrain actuation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2363891A1 (de) * 1973-07-13 1975-06-26 Daimler Benz Ag Ventilverstellung fuer brennkraftmaschinen
US4205634A (en) * 1978-02-17 1980-06-03 Tourtelot Edward M Jr Variable valve timing mechanism
US4459946A (en) * 1982-05-17 1984-07-17 Investment Rarities, Incorporated Valve actuating apparatus utilizing a multi-profiled cam unit for controlling internal combustion engines
US4469056A (en) * 1983-02-22 1984-09-04 Tourtelot Jr Edward M Dual follower variable valve timing mechanism
IT1220275B (it) * 1988-01-19 1990-06-15 Franco Storchi Complesso di elementi per la fasatura variabile delle valvole di un motore,in particolare di un motore a combustione interna
DE3833540A1 (de) * 1988-10-01 1990-04-12 Peter Prof Dr Ing Kuhn Vorrichtung zur betaetigung der ventile an verbrennungsmotoren mit veraenderlicher ventilerhebungskurve
DE4135257C2 (de) * 1991-10-25 1998-09-03 Peter Prof Dr Ing Kuhn Vorrichtung zur Betätigung der Ventile in Verbrennungsmotoren mittels umlaufender Nocken
DE4326331A1 (de) * 1992-07-15 1995-02-09 Bayerische Motoren Werke Ag Ventiltrieb einer Brennkraftmaschine
DE10040544A1 (de) * 2000-08-18 2002-02-28 Schaeffler Waelzlager Ohg Variabler Ventiltrieb zur Laststeuerung einer fremdgezündeten Brennkraftmaschine

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DE10215281A1 (de) 2003-10-16
DE50305150D1 (de) 2006-11-09
EP1350928A3 (fr) 2003-12-10
EP1350928A2 (fr) 2003-10-08

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