EP0821141B1 - Commande de soupape pour moteur à combustion interne comprenant un levier en appui sur arbre à excentriques - Google Patents

Commande de soupape pour moteur à combustion interne comprenant un levier en appui sur arbre à excentriques Download PDF

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Publication number
EP0821141B1
EP0821141B1 EP97110694A EP97110694A EP0821141B1 EP 0821141 B1 EP0821141 B1 EP 0821141B1 EP 97110694 A EP97110694 A EP 97110694A EP 97110694 A EP97110694 A EP 97110694A EP 0821141 B1 EP0821141 B1 EP 0821141B1
Authority
EP
European Patent Office
Prior art keywords
eccentric shaft
valve
eccentric
combustion engine
internal combustion
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
EP97110694A
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German (de)
English (en)
Other versions
EP0821141A1 (fr
Inventor
Harald Unger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0821141A1 publication Critical patent/EP0821141A1/fr
Application granted granted Critical
Publication of EP0821141B1 publication Critical patent/EP0821141B1/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
    • 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
    • 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
    • F01L13/0021—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 rocker arm ratio
    • F01L13/0026—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 rocker arm ratio by means of an eccentric
    • 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
    • F01L2001/0475—Hollow camshafts
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/032—Electric motors

Definitions

  • the invention relates to a valve train of an internal combustion engine Eccentrics of an eccentric shaft supporting, actuated by cams and in particular designed as a rocker arm transmission members, wherein the valve stroke can be changed by turning the eccentric shaft and Rotating the eccentric shaft next to a servomotor when turning it the eccentric support designed as a spring element Force storage element is provided.
  • a valve train is from the EP 0 132 786 A is known, furthermore DE 42 23 172 C1 or the DE 42 23 173 A1 similar valve trains, for the following description reference is first made to the latter two documents.
  • valve lift curve i.e. especially the maximum achievable Valve stroke of all of these, for example, designed as intake valves Lift valves
  • these globe valves as usual and known to the expert against the force of a so-called Valve closing spring must be opened, also when turning the eccentric shaft in the sense of increasing the valve stroke is always a certain one Share of this valve closing spring force can be overcome.
  • Valve closing spring With a multi-cylinder Internal combustion engine with a single eccentric shaft for the series arranged cylinder will namely always at least for one of these Cylinder of the cams outside of its base circle phase, in which the The lift valve is closed.
  • the eccentric shaft for example can be provided as an electric motor trained servomotor, the is controlled accordingly by suitable control electronics.
  • the eccentric shaft can be rotated by this actuator and from a Position in which a small valve lift is generated, towards a Position, which gives the maximum possible valve lift, is due to the Valve closing spring forces require a relatively high torque, which is a disproportionately strong and therefore large servomotor / electric motor required.
  • the eccentric with the hollow eccentric shaft are connected, within which the on this acting spring element designed as a twisted torsion bar spring is arranged, which the servomotor at a desired rotation the eccentric shaft towards a larger valve stroke supported.
  • Advantageous training and further education are included in the subclaims.
  • FIG. 1 that is required in a diagram to rotate the eccentric shaft Torque depending on the respective eccentric shaft positions shows.
  • FIG. 2a shows detail A
  • FIG. 2b shows detail B from FIG. 2.
  • valve train according to The preamble of claim 1 is in its entirety to the two at the beginning referred to documents DE 42 23 172 C1 and DE 42 23 173 A1
  • the present invention also other valve trains with at least one eccentric shaft on which different from Support cam-actuated transmission elements, is applicable.
  • the valve stroke or the valve lift curve of the lift valves actuated by the rocker arms can be changed.
  • the torque required to turn the eccentric shaft is shown qualitatively in Fig. 1.
  • the twist angle of the eccentric shaft is on the abscissa of this diagram applied, with a twist angle of 0 ° the minimum possible Valve lift - this can be a zero lift, for example. H. the lift valve is not opened at all - corresponds, while at an angle of rotation of 180 ° gives the maximum possible valve lift. On the ordinate of this diagram is (qualitatively) the required torque applied to turn the eccentric shaft into a desired position.
  • the different waveforms 1 through 5 in this diagram are explained below:
  • Curve 1 indicates the torque that is required, the eccentric shaft (for example according to DE 42 23 172 C1) without any additional measures from the position 0 °, ie from the position of the minimum possible valve lift, to any other position 180 °, ie that of the maximum possible valve stroke.
  • a torque value M ' max is required to reach the eccentric shaft position of 180 °.
  • This required torque can in principle be applied by a servomotor, for example an electric motor.
  • valve stroke is then to be reduced again starting from this eccentric shaft position 180 ° or also from a position in the range between 0 ° and 180 °, a torque corresponding to curve 2, starting from the respective starting value, is required.
  • negative torque values have to be applied, or the servomotor or electric motor rotates in the opposite direction.
  • the amount of torque to be applied is less, since when the eccentric shaft is turned back, the valve closing spring forces at least partially compensate for the frictional resistance, while when the valve is turned from 0 ° to 180 °, the increasing valve closing spring forces are added to the frictional resistance.
  • the frictional resistances in the system are so high that the eccentric shaft, once positioned, maintains its respective position, ie the eccentric shaft is not twisted by the valve closing spring forces alone.
  • Curve 3 indicates which torque is to be applied in order to turn the eccentric shaft from 0 ° to 180 °, ie from the position of the minimum valve lift to the position of the maximum possible valve lift. It can be seen that a relation to the amount of M 'max is significantly lower amount M max required to the eccentric shaft to rotate, for example, from the position 90 ° to position 180 ° (these values are referredsver-understandable way of example only). The torque to be applied by the servomotor to turn the eccentric shaft is therefore significantly lower, so that a smaller servomotor / electric motor can be used.
  • this curve 3 intersects the abscissa at the position of approximately 52 angular degrees, which means that on this curve 3 coming from the left, no additional torque of an actuating motor is required at all in order to bring the eccentric shaft into this position 52 °.
  • the eccentric shaft is rotated into the 52 ° position solely by the spring element. Since this eccentric shaft position 52 ° corresponds to a valve lift that is greater than the minimum possible valve lift, the eccentric shaft is thus advantageously brought into this position solely by the spring element, which results in a larger than the minimum valve lift.
  • a constructive embodiment for the servomotor of the eccentric shaft supportive when turning the valve into a position of larger valve lift Spring element or energy storage element is together with the with the reference number 11 designated eccentric shaft in Figs. 2, 2a, 2b shown, with the cut line lying to the left of the breaking line 9 shown Eccentric shaft half rotated by 90 ° with respect to the right-hand side is.
  • Electric motor trained servomotor for positioning the eccentric shaft 11 it is not shown, for example, as Electric motor trained servomotor for positioning the eccentric shaft 11, however, this can be arranged in any manner familiar to the person skilled in the art his.
  • the reference number 10 designated spring element formed as a twisted torsion bar and arranged within the hollow eccentric shaft 11 along the axis thereof.
  • This torsion bar spring 10 is at the end by means of two half-shell elements 12 on the eccentric shaft 11 on the one hand and on a rigid component attached to the internal combustion engine on the other hand, the fixation of the Torsion bar spring 10 in the half-shell elements 12 as can be seen in each case is form-fitting.
  • the bent ends of the spring element 10 are thus form-fitting by those working together Half-shell elements 12 added.
  • the spring element is on the right-hand side with respect to the eccentric shaft 11 according to FIG. 2 10 is thus connected in a rotationally fixed manner to the internal combustion engine, on the left-hand side this twisted torsion bar spring 10, however, non-rotatably with the eccentric shaft 11 connected.
  • this spring element 10 of the eccentric shaft 11 such an at least supporting torque imprint that the eccentric shaft in one position as described is rotated, which is a larger one based on the current position Valve stroke results.

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

Claims (3)

  1. Commande de soupape d'un moteur à combustion interne comportant des organes de transmission notamment réalisés sous forme de leviers oscillants, actionnés par des cames et s'appuyant sur des excentriques d'un arbre à excentriques (11), la course de soupape se modifiant par rotation de l'arbre à excentriques (11) et cette rotation de l'arbre à excentriques (11) étant assurée par un actionneur et par un élément de ressort (10) en forme d'élément accumulateur de force qui assiste l'actionneur dans sa rotation des excentriques,
    caractérisée en ce que
    les excentriques sont reliés solidairement en rotation à l'arbre à excentriques (11) creux et, à l'intérieur de celui-ci il est prévu un élément de ressort (10) en forme de ressort de torsion agissant sur l'arbre à excentriques, et soutenant l'actionneur pour la rotation souhaitée de l'arbre à excentriques (11), en agissant dans le sens d'une plus grande course de soupape.
  2. Commande de soupape selon la revendication 1,
    caractérisée en ce que
    l'élément de ressort (10) a tendance à entraíner l'arbre à excentriques (11), sans action de l'actionneur, dans une position donnant une course de soupape supérieure à la course minimale possible.
  3. Commande de soupape selon la revendication 2,
    caractérisée en ce que
    la barre de torsion (10) est bloquée à ses deux extrémités par une liaison de forme, chaque fois à l'aide de deux demi-éléments de coquille (12) à savoir d'un côté au niveau du segment d'extrémité de l'arbre à excentriques (11), et du côté opposé de l'arbre à excentriques, à l'extérieur de celui-ci, dans un segment de palier (16) de l'arbre à excentriques.
EP97110694A 1996-07-24 1997-07-01 Commande de soupape pour moteur à combustion interne comprenant un levier en appui sur arbre à excentriques Expired - Lifetime EP0821141B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19629881A DE19629881A1 (de) 1996-07-24 1996-07-24 Ventiltrieb einer Brennkraftmaschine mit sich an einer Exzenterwelle abstützenden Schwinghebeln
DE19629881 1996-07-24

Publications (2)

Publication Number Publication Date
EP0821141A1 EP0821141A1 (fr) 1998-01-28
EP0821141B1 true EP0821141B1 (fr) 2001-05-30

Family

ID=7800714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110694A Expired - Lifetime EP0821141B1 (fr) 1996-07-24 1997-07-01 Commande de soupape pour moteur à combustion interne comprenant un levier en appui sur arbre à excentriques

Country Status (2)

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EP (1) EP0821141B1 (fr)
DE (2) DE19629881A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059285A1 (de) * 2000-11-29 2002-06-06 Bayerische Motoren Werke Ag Regelverfahren für den Stellantrieb eines variablen Ventiltriebes
DE10104038A1 (de) * 2001-01-31 2002-08-01 Bayerische Motoren Werke Ag Vorrichtung zum Verdrehen einer Exzenterwelle eines Ventiltriebs
DE102005040959A1 (de) * 2005-08-30 2007-03-08 Bayerische Motoren Werke Ag Hubvariabler Ventiltrieb für eine Brennkraftmaschine
DE102011009417A1 (de) 2011-01-25 2012-07-26 Kolbenschmidt Pierburg Innovations Gmbh Mechanisch steuerbare Ventiltriebanordnung
DE102012204396A1 (de) * 2012-03-20 2013-09-26 Man Diesel & Turbo Se Ventiltrieb für Gaswechselventile einer Brennkraftmaschine
CN110159385B (zh) * 2019-06-26 2023-07-18 吉林大学 一种发动机气门正时和升程同时可变装置及其控制方法
CN113958685B (zh) * 2021-11-08 2024-03-12 重庆市巨亮机械制造有限责任公司 一种粉末冶金凸轮轴端头组合

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3462818D1 (en) * 1983-07-21 1987-04-30 Nissan Motor Variable valve timing mechanism
JP2944264B2 (ja) * 1991-07-23 1999-08-30 株式会社ユニシアジェックス 内燃機関の動弁装置
DE4223172C1 (en) * 1992-07-15 1993-08-19 Bayerische Motoren Werke Ag, 8000 Muenchen, De Cylinder head for IC engine - bearing cover for cam shaft bearing also acts for bearing for eccentric shaft
DE4223173A1 (de) * 1992-07-15 1994-01-20 Bayerische Motoren Werke Ag Ventiltrieb einer Brennkraftmaschine
DE19502834A1 (de) * 1995-01-30 1996-08-08 Erwin Korostenski Anordnung zur Lagerung eines Bauteils
DE19509604A1 (de) * 1995-03-16 1996-09-19 Bayerische Motoren Werke Ag Ventiltrieb einer Brennkraftmaschine
JPH08296718A (ja) * 1995-04-24 1996-11-12 Isuzu Motors Ltd バックラッシュ除去装置

Also Published As

Publication number Publication date
DE59703649D1 (de) 2001-07-05
DE19629881A1 (de) 1998-01-29
EP0821141A1 (fr) 1998-01-28

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