EP1552117A1 - Dispositif electromagnetique d'actionnement de soupape a position neutre reglable - Google Patents

Dispositif electromagnetique d'actionnement de soupape a position neutre reglable

Info

Publication number
EP1552117A1
EP1552117A1 EP03750561A EP03750561A EP1552117A1 EP 1552117 A1 EP1552117 A1 EP 1552117A1 EP 03750561 A EP03750561 A EP 03750561A EP 03750561 A EP03750561 A EP 03750561A EP 1552117 A1 EP1552117 A1 EP 1552117A1
Authority
EP
European Patent Office
Prior art keywords
valve
neutral position
actuator
armature plate
electromagnetic valve
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.)
Granted
Application number
EP03750561A
Other languages
German (de)
English (en)
Other versions
EP1552117B1 (fr
Inventor
Johannes Meyer
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 EP1552117A1 publication Critical patent/EP1552117A1/fr
Application granted granted Critical
Publication of EP1552117B1 publication Critical patent/EP1552117B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • 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
    • F01L2820/01—Absolute values

Definitions

  • the present invention relates to an electromagnetic valve drive device according to the preamble of claim 1.
  • An electromagnetic valve drive device is known for example from DE 694 09 485 T2, the content of which is referred to in full in the present application.
  • the valve drive device described there has an actuator or an “armature” with an “armature plate”.
  • the actuator with the armature plate is arranged displaceably and is provided for actuating a valve of an internal combustion engine, ie an intake valve or an exhaust valve.
  • the armature plate is arranged between two electromagnets spaced apart in the direction of displacement. One electromagnet is arranged on the side of the armature plate near the valve and the other on the side of the armature plate away from the valve.
  • two compression springs are provided, one compression spring also being arranged on the side near the valve and the other compression spring on the side of the anchor plate remote from the valve.
  • the compression springs push the actuator or the anchor plate into a neutral position. In the neutral position, the spring forces just cancel each other out.
  • the actuator or the armature plate can be deflected against the spring forces.
  • the valve connected to the actuator can be opened or closed by deflecting the actuator.
  • the valve In the neutral position of the actuator, the valve is in a "middle position", in which is partially open.
  • a hexagon socket screw is provided for fine adjustment of the neutral position, which presses against the end of the compression spring remote from the valve. By turning the adjusting screw, the pretension of the two springs and thus the position of the actuator in neutral position with respect to the electromagnets can be changed.
  • Adjusting the neutral position of the actuator involves considerable work and is only possible in the workshop. However, a fixed neutral position of the actuator is always an energetic "compromise" for some engine operating conditions. To open or close the valve, one or the other electromagnet must be energized. To minimize the need for electrical energy, it would be desirable if the neutral position of the actuator could be changed during operation of the internal combustion engine.
  • the object of the invention is to provide an electromagnetic valve drive device which is optimized with regard to the energy requirement.
  • the invention is based on an electromagnetic valve drive device with an axially displaceable actuator for opening or closing a valve.
  • the actuator has an anchor plate.
  • two electromagnets arranged one behind the other and spaced apart in the direction of displacement are provided, one electromagnet being arranged on the valve-side side of the armature plate and the other electromagnet being arranged on the valve-side side of the armature plate.
  • the actuator or the armature plate By energizing the electromagnets, the actuator or the armature plate can be deflected from the neutral position.
  • a stop element is provided at one end of one of the two springs. By Adjusting the stop element, the bias of the springs and thus the position of the neutral position of the actuator with respect to the electromagnet can be changed.
  • the essence of the invention is that the stop element is arranged to be displaceable in the direction of displacement of the actuator and that an actuating device is provided which enables the stop element to be displaced during operation of the valve drive device. An adjustment of the neutral position of the actuator is therefore possible during operation of the engine.
  • the neutral position of the actuator or the anchor plate can thus be changed depending on the load condition.
  • the neutral position in which the forces of the two springs just cancel out, can be shifted in the direction of the electromagnet near the valve or in the direction of the electromagnet remote from the valve.
  • the valve is an intake valve or an exhaust valve, depending on the load condition of the internal combustion engine, it makes sense for energy reasons to change the neutral position of the actuator during operation.
  • the exhaust valve With the exhaust valve, it makes sense to bring the actuator or the armature plate into a neutral position when starting the engine or in low-load operation, which corresponds to the middle position between the two electromagnets. In this neutral position, the armature plate is equidistant from both electromagnets, provided that they are not energized. In load operation, however, it is energetically advantageous if the neutral position of the actuator is shifted towards the solenoid near the valve. This is possible by operating the actuating element. By actuating the actuating element, the stop element resting on a spring end can be displaced in the direction of displacement of the actuator. By moving the stop element, the preload of the two springs and thus the position of the neutral position can be changed.
  • the actuator or the armature plate is not in the middle position between the two electromagnets after the engine is started or in idle and in part-load operation, but rather for electromagnet remote from the valve is displaced.
  • the actuator By actuating the actuating device, the actuator can be moved during load operation so that its neutral position corresponds to the central position between the two electromagnets.
  • a hydraulic actuation device preferably has a swivel lever with a short and a long lever arm.
  • the short lever arm interacts with the stop element of the actuating device.
  • the long lever arm is acted upon by a hydraulic cylinder.
  • the hydraulic cylinder can be connected to the engine oil circuit via a lockable solenoid valve. When the internal combustion engine is under load, the engine oil pressure is sufficiently high that the swivel arm can be actuated to adjust the neutral position when the solenoid valve is open.
  • one end of the upper or valve-distant spring is displaced in the direction of displacement by means of the pivot lever by twice the desired neutral position adjustment.
  • An adjustment screw can be provided on the short lever arm of the swivel lever for fine adjustment of the neutral position.
  • the adjusting screw can be screwed directly into the short lever arm and against the stop element the spring away from the valve.
  • the adjusting screw is preferably secured against rotation by a screw lock, for example by a lock nut.
  • Such an actuating device can be assigned to a single valve. However, such an actuating device is preferably provided for adjusting the actuators of two or more valves.
  • the hydraulic pistons assigned to the inlet valves or the outlet valves can each be connected to one another by a common oil line and connected to the engine oil circuit via a simple solenoid valve.
  • the actuating device enables "two-point adjustment". This means that the actuator can be switched between exactly two neutral positions. In this case, no sensors are required to detect the neutral position.
  • continuous control of the neutral position can also be provided by appropriate control of the hydraulic pressure. This means that not only an upper and a lower neutral position can be set, but also any neutral positions in between.
  • Figure 1 is a perspective view of a neutral position adjustment device
  • Figure 2 shows the neutral position adjustment device in cross section in an unactuated position
  • Figure 3 shows the neutral position adjustment device in an actuated position
  • Figure 4 shows a section through the valve train device when closed
  • Valve; and Figure 5 is a plan view of the neutral position adjustment device.
  • FIG. 1 shows an actuator 1 of an electromagnetic valve drive device for an internal combustion engine.
  • the actuator 1 is for actuating two valves, e.g. provided by two exhaust valves or two intake valves. The valves are not shown in the illustration shown.
  • an actuator is assigned to each valve, which is formed by an anchor rod 2 (see FIGS. 2, 3) and an anchor plate 3 (FIG. 4).
  • a valve spring is provided on each side of the anchor plate, only one upper valve spring being shown in FIGS. 1 to 3, which can also be referred to as valve spring 4, 5 remote from the valve.
  • the basic structure of such an actuator with two oppositely acting valve springs is known, for example, from DE 694 09 485 T2, to which, as already mentioned, reference is made in full.
  • the two valve springs press the armature rod 2 with its armature plate 3 into a neutral position. In the neutral position, the forces of the opposing upper and lower valve springs just cancel each other out. In the neutral position of the anchor rod or anchor plate, the valve interacting with the anchor rod is partially open, e.g. half open. To completely open or close the valves, one valve-close and one valve-remote electromagnet are provided for each valve.
  • FIGS. 2 and 3 only the electromagnet 6 remote from the valve is shown above the armature plate.
  • valve-close electromagnet 7 is also shown.
  • the two electromagnets 6, 7 are spaced apart from one another in the direction of displacement of the armature rod 2 or the armature plate 3.
  • the valve remote electromagnet 6 is energized. That is, the armature plate 3 is attracted by the electromagnet remote from the valve and the valve connected to the armature rod 2 is closed.
  • a stop element 8 is attached to the end of the anchor rod 2 remote from the valve, which is provided to support the upper valve spring 4, 5.
  • a further display element 9 is also provided.
  • the valve remote valve spring 4 is thus clamped between the two stop elements 8, 9.
  • the upper stop element 9 is acted upon by a pivot lever 10 or 10 '.
  • the pivot lever 10 or 10 ' has a short lever arm 11 or 11' and a long lever arm 12 or 12 '.
  • an adjusting screw 13 or 13' is screwed, which presses directly against the upper stop element 9 or 9 '.
  • the pivot levers 10 can each be pivoted about a pivot axis 14, 14 'shown in dashed lines, which divides the pivot lever 10, 10' into the short lever arm 11, 11 'and into the long lever arm 12, 12' ,
  • the two long lever arms 12, 12 ' are acted upon by a common hydraulically actuated piston 15.
  • the piston 15 can be connected to the engine oil circuit via a lockable solenoid valve.
  • FIG. 2 shows the deactivated state.
  • the piston 15 is not subjected to engine oil pressure.
  • FIG. 3, shows a state in which the hydraulic piston 15 is displaced upward by engine oil pressure.
  • the pivot lever 10 is pivoted counterclockwise.
  • the upper stop element 9 is pressed down over the short lever arm 11 of the swivel lever 10.
  • the spring 4 remote from the valve and the associated spring 5 close to the valve are compressed. That is, the two springs are further biased.
  • the armature rod 2 or the armature plate 3 is thereby displaced in the direction of the electromagnet near the valve (cf. FIG. 4).
  • a separate actuating device ie a separate piston 15, can also be assigned to each valve or, more precisely, each valve rod or each anchor plate.

Landscapes

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

Abstract

L'invention concerne un dispositif électromagnétique d'actionnement de soupape pour un moteur à combustion interne, qui comprend un actionneur à déplacement axial servant à ouvrir ou fermer une soupape et présentant un plateau d'induit. Ce dispositif comporte également deux électroaimants espacés l'un de l'autre et placés l'un dernière l'autre dans le sens de déplacement ainsi que deux ressorts placés l'un derrière l'autre dans le sens de déplacement, un des ressorts étant placé sur le côté du plateau d'induit situé à proximité de la soupape et l'autre sur le côté du plateau d'induit éloigné de la soupape. De plus, ledit actionneur peut être dévié de sa position neutre par l'alimentation en courant des électroaimants. Un élément de réglage, reposant contre l'extrémité du premier des deux ressorts éloignée du plateau d'induit, permet de modifier la précontrainte des ressorts et l'emplacement de la position neutre dudit actionneur. Cet élément de réglage est monté de façon à pouvoir se déplacer dans le sens de déplacement et un dispositif d'actionnement permet un réglage de la position neutre pendant le fonctionnement du dispositif d'actionnement de soupape.
EP03750561A 2002-10-17 2003-09-17 Dispositif electromagnetique d'actionnement de soupape a position neutre reglable Expired - Lifetime EP1552117B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10248330 2002-10-17
DE10248330A DE10248330A1 (de) 2002-10-17 2002-10-17 Elektromagnetische Ventiltriebvorrichtung mit einstellbarer Neutralstellung
PCT/EP2003/010330 WO2004035999A1 (fr) 2002-10-17 2003-09-17 Dispositif electromagnetique d'actionnement de soupape a position neutre reglable

Publications (2)

Publication Number Publication Date
EP1552117A1 true EP1552117A1 (fr) 2005-07-13
EP1552117B1 EP1552117B1 (fr) 2008-04-09

Family

ID=32049337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03750561A Expired - Lifetime EP1552117B1 (fr) 2002-10-17 2003-09-17 Dispositif electromagnetique d'actionnement de soupape a position neutre reglable

Country Status (5)

Country Link
US (1) US7188823B2 (fr)
EP (1) EP1552117B1 (fr)
JP (1) JP4324556B2 (fr)
DE (2) DE10248330A1 (fr)
WO (1) WO2004035999A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3024109A1 (de) * 1980-06-27 1982-01-21 Pischinger, Franz, Prof. Dipl.-Ing. Dr.Techn., 5100 Aachen Elektromagnetisch arbeitende stelleinrichtung
DE3920931A1 (de) * 1989-06-27 1991-01-03 Fev Motorentech Gmbh & Co Kg Elektromagnetisch arbeitende stelleinrichtung
JP3106890B2 (ja) * 1995-01-11 2000-11-06 トヨタ自動車株式会社 内燃機関の弁駆動装置
DE19723792C1 (de) * 1997-06-06 1998-07-30 Daimler Benz Ag Einrichtung zur Einstellung eines elektromagnetischen Aktuators
JP3921311B2 (ja) * 1998-10-30 2007-05-30 株式会社日立製作所 機関弁の電磁駆動装置
JP3935008B2 (ja) * 2002-07-16 2007-06-20 本田技研工業株式会社 エンジンの動弁装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004035999A1 *

Also Published As

Publication number Publication date
US7188823B2 (en) 2007-03-13
DE50309591D1 (de) 2008-05-21
DE10248330A1 (de) 2004-04-29
EP1552117B1 (fr) 2008-04-09
JP2006503211A (ja) 2006-01-26
JP4324556B2 (ja) 2009-09-02
WO2004035999A1 (fr) 2004-04-29
US20050178990A1 (en) 2005-08-18

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