EP3011148B1 - Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable - Google Patents

Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable Download PDF

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Publication number
EP3011148B1
EP3011148B1 EP14708531.0A EP14708531A EP3011148B1 EP 3011148 B1 EP3011148 B1 EP 3011148B1 EP 14708531 A EP14708531 A EP 14708531A EP 3011148 B1 EP3011148 B1 EP 3011148B1
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EP
European Patent Office
Prior art keywords
valve
control shaft
gas exchange
strokes
trains
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
EP14708531.0A
Other languages
German (de)
English (en)
Other versions
EP3011148A1 (fr
Inventor
Libor SNASEL
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
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Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP3011148A1 publication Critical patent/EP3011148A1/fr
Application granted granted Critical
Publication of EP3011148B1 publication Critical patent/EP3011148B1/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
    • F01L13/0063—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or 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
    • F01L2820/04—Sensors
    • F01L2820/045—Valve lift

Definitions

  • the invention relates to a method for the production of valve synchronizing strokes on variable valve drives, wherein a control shaft to be machined is inserted into a grinding machine and the camshaft cam are ground off according to stored values (see EP-1431525 ).
  • Control shafts are used in variable valve trains, as have become known for example under the terms univalve or valvetronic, to change the valve lift curve.
  • cams are arranged on the control shafts, which abut against rollers of a rocker arm, which performs a modified tilting movement depending on the position of the cam of the control shaft.
  • control shafts must, in order to ensure a Gleichhub all valves of an internal combustion engine, as well as the cooperating intermediate lever and roller rocker arms are classified, so the accuracy of their production are checked. This requires a lot of effort.
  • accurate manufacturing tolerances especially in the grinding of the cam of the control shaft, the proportion of components that are not manufactured sufficiently accurate, relatively large, so that an increased committee arises or post-processing is required.
  • the total existing in the motion strand tolerances despite adhering to individual tolerances, especially in the tolerance chain control shaft, intermediate lever and roller cam followers can add up significantly, which can lead to unequal valve lifts the individual valves built.
  • the disadvantage is thus the high cost of the classification of the items and the high cost of rework or re-production due to cumulative tolerances noticeable.
  • the respective control shaft and the associated intermediate lever and roller cam followers are unambiguously associated with one another for further installation. This prevents confusion of the coordinated components.
  • the characteristic field is determined by tests with reference intermediate levers and reference roller towing levers. These reference intermediate levers and reference roller follower levers, as well as the reference camshaft and the reference control shaft, are fully measured and correspondingly have dimensions corresponding to the optimum components. With these components, it can be determined by experiments for which modified control shaft diameter, which valve lift changes follow. In this way, the required characteristic is determined in advance.
  • Reference valves for measuring are preferably arranged in the measuring device. Since the largest deviations occur due to tolerances on the levers and the control shaft, the use of reference valves, the effort in preparing for the measurement is kept low, since always the same valves can be used for many consecutive measurements.
  • the measurement is performed in a defined reference position of the reference control shaft.
  • the reference control shaft can be inserted so firmly into the measuring device.
  • the reference position of the reference control shaft is the position in which this causes a minimum stroke of the valves. Accordingly, the adjustment is made again in the most critical operating point, as unequal valve strokes have undesirable consequences, especially in operating conditions with low valve strokes. This in turn improves the accuracy of the adjustment.
  • valve Gleichh is thus a method for producing valve Gleichh Wegney
  • variable valve trains created by internal combustion engines with the greatest possible tolerances of the valve strokes of all valves of an engine, especially in the range of small required valve strokes, is still ensured.
  • Classification is no longer required. Additional components compared to the usual methods are not needed.
  • the scrap or the necessary post-processing of components is significantly reduced, so that a higher process stability is present. It can be created in a cost effective manner, a variable valve train, with a smooth running of the motor is ensured.
  • Figure 1 shows a schematic representation of the measurement and the following processing.
  • the inventive method uses a measuring device 10, in which a reference camshaft 12, a reference control shaft 14 and four reference scenes 16 inserted in the present embodiment are. Furthermore, there are 10 receptacles for eight reference gas exchange valves 18 in the measuring device.
  • the measuring device 10 has a measuring probe 20 for each gas exchange valve 18, via which the deflection of each gas exchange valve 18 in the measuring device 10 can be measured from a reference zero point.
  • the probes 20 are connected via a data cable 22 to a control unit 24, which is either connected to a CNC Schlofmaschine 26 via another data cable 22 or integrated in the CNC grinding machine 26.
  • variable valve train in the measuring device 10 is completed by four intermediate lever 28 and eight roller rocker arms 30 are inserted into the measuring device 10 and loaded by four double torsion springs 32 in a known manner against the reference gate 16, the reference camshaft 12 and the reference control shaft 14, so that a complete valve train is created.
  • control shaft 34 to be machined with control shaft cams 36, which interact with the intermediate levers 28, is inserted into the grinding machine 26.
  • the control shaft 34 to be processed as well as the intermediate levers 28 and the roller rocker arms 10 are later installed together in an internal combustion engine and were exactly at the positions where they are arranged in the measuring device 10 and cooperate.
  • the components are marked accordingly, for example by matrix lasers.
  • the measurement process starts by turning the reference camshaft 12 once or several times. This rotation results in a valve lift on each individual reference gas exchange valve 18, which is picked up by the probes 20 and passed on to the control unit 24 via the data cable 22.
  • the reference control shaft 14 is in the rotational position in which it causes the smallest valve lift.
  • the reference gas exchange valve 18 is determined with the smallest valve lift and the valve lift differences .DELTA.x this reference gas exchange valve 18 is calculated to all other reference gas exchange valves 18.
  • This valve lift difference .DELTA.x corresponds in each case to a center distance difference .DELTA.d in comparison to a nominal dimension of the control shaft 34.
  • the corresponding characteristic curve is previously determined by means of tests with reference intermediate levers and reference roller follower levers, so that this determined ⁇ x / ⁇ d characteristic can be stored in the control unit 24.
  • the CNC grinding machine 26 now processes the control shaft 34 to be machined so that the portions of the control shaft 34, which cooperate with a gas exchange valve 18, so the control cam 36, which do not have the smallest valve lift, not only ground to nominal size, but in addition to the calculated center distance difference ⁇ d.
  • the intermediate and roller rocker arms can be manufactured with less exact tolerances, which significantly reduces manufacturing costs. Nevertheless, a Ventilretehub is achieved, resulting in a much quieter engine running. The adjustment to these smallest valve strokes is performed, since in this area the largest differences in volume flow occur with small valve lift differences, causing the uneven running of the engine.

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 (10)

  1. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable, dans laquelle un arbre de commande (34) à usiner es placer dans une rectifieuse (26) et les cames (36) de l'arbre de commande sont abrasés conformément à des valeurs stockées,
    caractérisée en ce que
    - des leviers intermédiaires (28) et culbuteurs à galet (30) à installer sont placer dans un dispositif de mesure (10) dans lequel sont disposés un arbre à cames de référence (12) et un arbre de commande de référence (14), ainsi que des coulisses de référence (16),
    - les levées de soupape résultantes sont mesurées dans le dispositif de mesure (10) pour un tour complet de l'arbre à cames de référence (12),
    - la soupape d'échange de gaz (18) avec la plus petite levée de soupape est déterminée,
    - la différence des levées de soupape Δx entre la soupape d'échange de gaz (18) avec la plus petite levée de soupape et la levée de soupape respective de chaque autre soupape d'échange de gaz (18) est mesurée,
    - les différences des levées de soupape Δx sont converties, à l'aide d'un diagramme caractéristique Δx/Δd, en des différences de l'écartement des axes Δd de l'arbre de commande à usiner (34), ledit diagramme caractéristique assignant une différence des levées de soupape Δx d'une soupape d'échange de gaz (18) à une différence de l'écartement des axes Δd de l'arbre de commande (34),
    - la came (36) de l'arbre de commande à assigner à la soupape d'échange de gaz (18) avec la plus petite levée de soupape est abrasée jusqu'à la dimension nominale et les autres cames (36) de l'arbre de commande sont abrasées jusqu'à la dimension nominale moins la différence de l'écartement des axes Δd de l'arbre de commande (34) de la soupape d'échange de gaz (18) respectivement associée, la différence étant déterminée à l'aide du diagramme caractéristique.
  2. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon la revendication 1, caractérisée en ce que l'arbre de commande (34) usiné et les leviers intermédiaires (28) et culbuteurs à galet (30) associés sont assignés clairement l'un à l'autre pour l'assemblage ultérieur.
  3. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce que le diagramme caractéristique est déterminé par des essais utilisant des leviers intermédiaires de référence et des culbuteurs à galet de référence.
  4. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce que le diagramme caractéristique est stocké dans une unité de commande (24) de la rectifieuse (26).
  5. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une machine CNC est utilisée comme rectifieuse (26).
  6. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce que des soupapes d'échange de gaz de référence (18) sont disposées dans le dispositif de mesure (10) pour le mesurage.
  7. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications 1 à 5, caractérisée en ce que des soupapes à installer, respectivement assignées aux leviers intermédiaires (28) et aux culbuteurs à galet (30), sont disposées dans le dispositif de mesure (10).
  8. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce que le mesurage est effectué dans une position de référence définie de l'arbre de commande de référence (14).
  9. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce que la position de référence de l'arbre de commande de référence (14) est la position dans laquelle celui-ci cause une levée minimale des soupapes d'échange de gaz de référence (18).
  10. Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable selon l'une quelconque des revendications précédentes, caractérisée en ce que plusieurs mesures sont effectuées dans différentes position définies de l'arbre de commande de référence (14) pour l'adéquation des données mesurées par le dispositif de mesure (10).
EP14708531.0A 2013-06-21 2014-03-05 Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable Not-in-force EP3011148B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310106515 DE102013106515B3 (de) 2013-06-21 2013-06-21 Verfahren zur Herstellung von Ventilgleichhüben an variablen Ventiltrieben
PCT/EP2014/054262 WO2014202241A1 (fr) 2013-06-21 2014-03-05 Procédé permettant la fabrication de levées identiques des soupapes sur des mécanismes de distribution variables

Publications (2)

Publication Number Publication Date
EP3011148A1 EP3011148A1 (fr) 2016-04-27
EP3011148B1 true EP3011148B1 (fr) 2017-05-10

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Application Number Title Priority Date Filing Date
EP14708531.0A Not-in-force EP3011148B1 (fr) 2013-06-21 2014-03-05 Méthode pour obtenir des levées de soupapes égales dans un mécanisme de distribution variable

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EP (1) EP3011148B1 (fr)
DE (1) DE102013106515B3 (fr)
WO (1) WO2014202241A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116175345B (zh) * 2023-02-10 2023-11-21 扬州江峰机械制造有限公司 气门推杆清洁打磨器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB854498A (en) * 1956-01-24 1960-11-23 Birmingham Small Arms Co Ltd Improvements in or relating to the gauging of cam profiles
DE10258277A1 (de) * 2002-12-13 2004-06-24 Mahle Ventiltrieb Gmbh Steuereinrichtung für Gaswechselventile eines Verbrennungsmotors
DE10304991A1 (de) * 2003-02-07 2004-08-19 Ina-Schaeffler Kg Verstellmittel in einem variablen Ventiltrieb einer Brennkraftmaschine
DE10323665B4 (de) * 2003-05-14 2009-02-05 Hydraulik-Ring Gmbh Variable Ventilhubvorrichtung zur Hubverstellung der Gaswechselventile einer Verbrennungskraftmaschine
DE102004053208A1 (de) * 2004-11-04 2006-07-20 Schaeffler Kg Vollvariable mechanische Ventilsteuerung mit einer Verstellwelle
DE102010048709B4 (de) * 2010-10-19 2013-01-03 Kolbenschmidt Pierburg Innovations Gmbh Mechanisch steuerbarer Ventiltrieb sowie mechanisch steuerbare Ventiltriebanordnung
DE102011003022A1 (de) * 2011-01-24 2012-07-26 Schaeffler Technologies Gmbh & Co. Kg Verfahren zur Erzielung eines gleichmäßigen Füllungsgrades der Zylinder eines Verbrennungsmotors

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Publication number Publication date
EP3011148A1 (fr) 2016-04-27
DE102013106515B3 (de) 2014-12-24
WO2014202241A1 (fr) 2014-12-24

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