EP1421262A1 - Valve mechanism comprising a variable cross-section of a valve opening - Google Patents

Valve mechanism comprising a variable cross-section of a valve opening

Info

Publication number
EP1421262A1
EP1421262A1 EP02737829A EP02737829A EP1421262A1 EP 1421262 A1 EP1421262 A1 EP 1421262A1 EP 02737829 A EP02737829 A EP 02737829A EP 02737829 A EP02737829 A EP 02737829A EP 1421262 A1 EP1421262 A1 EP 1421262A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve mechanism
gas exchange
mechanism according
sealing
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
EP02737829A
Other languages
German (de)
French (fr)
Other versions
EP1421262B1 (en
Inventor
Uwe Hammer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1421262A1 publication Critical patent/EP1421262A1/en
Application granted granted Critical
Publication of EP1421262B1 publication Critical patent/EP1421262B1/en
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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • F01L3/085—Valve cages
    • 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
    • F01L1/28—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of coaxial valves; characterised by the provision of valves co-operating with both intake and exhaust ports
    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats

Definitions

  • Valve mechanism with a variable valve opening cross-section
  • the invention relates to a valve mechanism with a variable valve opening cross section with the features mentioned in the preamble of claim 1.
  • electro-hydraulic valve control it is known to use an electro-hydraulic valve control in addition to a camshaft control.
  • the electro-hydraulic valve control offers the possibility of a variable or fully variable valve control, so that an optimization of the gas exchange and thus an increase in the engine efficiency of the internal combustion engine is possible.
  • the electrohydraulic valve control comprises a hydraulically actuated control valve, the control valve piston of which actuates a valve body of the intake and exhaust valves and leads against a valve seat (valve seat ring) (closing the valve) or moves it away (opening the valve).
  • the control valve can be actuated by pressure control of a hydraulic medium. The pressure is controlled via solenoid valves integrated in the hydraulic circuit. In order to achieve the best possible gas exchange, the highest possible switching speeds of the control valve are desirable. Due to these high switching speeds, the valve body of the intake and exhaust valves hits the valve seat ring at high speed. This results in noise on the one hand and the valve partners are subject to relatively high wear.
  • EP 0 455 761 B1 relates to a hydraulic valve control device for an internal combustion engine.
  • the basic technical principle of this solution is to move an engine valve by means of a controlled pressure of a hydraulic fluid.
  • an electronic control device controls a solenoid valve, which in turn controls the movement of a storage piston, via which the stroke of the engine valve is changed.
  • EP 0 512 698 AI describes an adjustable valve system for an internal combustion engine. This solution represents an example of a mechanical valve control via cams of a rotating camshaft.
  • OS 4,777,915 relates to an electromagnetic valve control system for an internal combustion engine.
  • a similar solution to an electromagnetic valve control is known from EP 0 471 614 AI.
  • the valve is moved back and forth to different positions by electromagnetic force.
  • the electromagnets are arranged in two different areas within a housing part of the cylinder head. By alternately activating the electromagnets, the valve is alternatively moved into two end positions, each of which corresponds to the opening and closing position of the valve. In these end positions of the valve, the passage opening to the combustion chamber of the air-fuel mixture is then most widely opened or completely closed.
  • valve control solutions A disadvantage of these known valve control solutions is, in particular, the high outlay in the manufacture and assembly of the valve mechanism due to its complicated design. This has a negative impact on the costs of production and assembly. Furthermore, these solutions require extremely high speeds and large forces for valve control, so that an increased susceptibility to failure of the valve control due to heavy wear of the parts of the valve mechanism is the inevitable consequence.
  • valve mechanism according to the invention offers the advantage, however. to create a variable valve opening cross-section with simple means.
  • a sealing slide is arranged coaxially with the gas exchange valve, which is acted upon by the force of a coupling spring and can be moved back and forth in the axial direction by the valve control unit, the position of the sealing slide relative to the gas exchange valve being preferably infinitely variable in the axial direction by an adjustment unit adjustable, a valve mechanism is created, which has a simple structure and works safely and permanently.
  • the advantage of inventing The valve mechanism according to the invention consists in particular in that a variable valve opening cross section can be produced, each individual valve being able to be regulated separately.
  • variable valve opening cross section can advantageously be produced with the valve mechanism according to the invention without high speeds and without great forces, so that the susceptibility to failure of this valve mechanism is very low.
  • the valve mechanism according to the invention can be manufactured and assembled inexpensively due to its simple structure.
  • the invention advantageously creates a variable valve control, by means of which an optimization of the gas exchange and thus an increase in the motor efficiency of the internal combustion engine is possible.
  • valve control unit is a camshaft.
  • the gas exchange valve has a rotationally symmetrical basic structure and is composed of a tilschaft VEN ', a valve plate disposed at the lower end.
  • valve plate has a conical circumferential surface which forms the sealing seat of the gas exchange valve. Furthermore, in a preferred embodiment of the invention it is provided that in the closed position of the valve mechanism, the sealing seat of the gas exchange valve is in each case in direct contact with a sealing seat of the sealing slide and with a valve seat ring of the cylinder head:
  • a preferred embodiment of the invention provides that the sealing slide consists of a bush-shaped bearing body which is arranged such that it can be moved axially back and forth within a guide of the cylinder head.
  • the supply of the air-fuel mixture can be regulated with great accuracy and thus a high degree of efficiency of the internal combustion engine can be achieved.
  • FIG. 1 shows a section through a cylinder head with the valve mechanism according to the invention and Figure 2 is a perspective view of a sealing slide of the valve mechanism according to the invention. Description of the embodiment
  • valve mechanism according to the invention In the two figures, the individual parts of the valve mechanism according to the invention are shown schematically and only with the components essential for the invention. Identical parts of the valve mechanism according to the invention are provided with the same reference symbols in the figures and are generally only described once.
  • the valve mechanism according to the invention is shown in FIG. 1 in its arrangement in the cylinder head 18 of an internal combustion engine.
  • the valve mechanism has a gas exchange valve 12 which is acted upon by the force of a valve spring 16.
  • the gas exchange valve 12 can be displaced axially back and forth within a guide, the displacement movement being generated by a valve control unit.
  • a camshaft (not shown) is provided as the valve control unit.
  • the gas exchange valve 12 has a rotationally symmetrical basic structure and consists of a valve stem 14, on the lower end of which a valve disk 20 is arranged.
  • FIG. 1 shows the valve mechanism in the closed position of the gas exchange valve 12.
  • the sealing seat 28 of the gas exchange valve 12 is in each case in direct contact with a sealing seat 30 of the sealing slide 10 and with a valve seat ring 22 of the cylinder head 18.
  • the structure and mode of operation of gas exchange valves 12 per se are generally known, so that this will not be dealt with in more detail in the present description.
  • the invention provides that a sealing slide 10 is arranged coaxially with the gas exchange valve 12.
  • the sealing slide 10 is acted upon by the force of a coupling spring 24 and can be moved axially back and forth.
  • the displacement movement of the sealing slide 10 is also generated by the camshaft (not shown), by which the displacement movement of the gas exchange valve 12 is controlled.
  • the sealing slide 10 is shown schematically in a perspective view.
  • the sealing slide 10 consists essentially of a bearing body 40 and a sealing body 38.
  • the bearing body 40 of the sealing slide 10 is bush-shaped and is arranged so that it can be moved axially back and forth within a guide of the cylinder head 18.
  • the sealing slide 10 has a cylindrical sealing body 38, the outer surface of which forms the sealing seat 30.
  • the sealing body 38 is connected to the bearing body 40 via connecting rods 42.
  • Stop disc 26 attached. To facilitate assembly, this stop disc 26 consists of two
  • the two parts of the stop disk 26 are surrounded by a clamping ring 36, by which they are held together.
  • connection between the sealing body 38 and the bearing body 40 is designed such that there is sufficient space for the air flowing through or for the air-fuel mixture. Both for the inlet and for the outlet of the air or of the air-fuel mixture, there is advantageously a sufficiently large passage opening within the sealing slide 10 for the unhindered flow of this medium.
  • valve mechanism shown in FIGS. 1 and 2 has the following function:
  • the gas control valve 12 can either be opened or closed by the valve control unit, which is a camshaft (not shown) in a preferred embodiment of the invention. As in a conventional valve train, the gas exchange valve 12 is pressed down via the camshaft on the valve stem 14 and the course of movement of the gas exchange valve 12 is controlled in the process. All known methods based on the technical principles of the bucket tappet, rocker arm, rocker arm and the like can be used for this.
  • the camshaft 44 works against the restoring force of the valve spring 16, which is on the cylinder head 18 and on the valve plate 20, which is in contact with the gas exchange valve
  • the sealing slide 10 is also moved via the coupling spring 24, which is under a certain pretension.
  • the coupling spring 24 is supported on the valve plate 20 and on the stop disk 26, which is connected to the sealing slide 10.
  • the sealing seat 30 of the sealing slide 10 is pressed onto the sealing seat 28 of the gas exchange valve 12. Since there is an annular gap seal between the sealing body 38 and the valve seat ring 22, only a very small amount of air (leakage) can get into the combustion chamber 32.
  • the control slide 34 is adjustable in the axial direction of the valve stem 14 in its starting position relative to the gas exchange valve 12.
  • the adjustment can be electric, 'hydraulically or pneumatically.
  • the control slide 34 can only be adjusted via an appropriate adjustment unit (not shown). Otherwise, the position of the control slide 34 remains fixed within the valve mechanism, even if external forces act on it.
  • the adjusting units can each be actuated electrically, hydraulically or pneumatically.
  • the sealing slide 10 can no longer perform any movement in the opening direction of the gas exchange valve 12. Since the gas exchange valve 12 is moved further by the camshaft, the sealing seat 28 of the gas exchange valve 12 lifts off from the sealing seat 30 of the sealing slide 10, air being able to penetrate into the combustion chamber 32.
  • the coupling spring 24 is compressed.
  • the gas exchange valve 12 follows the closing flank of the camshaft, it is pressed in the closing direction by the valve spring 16.
  • the sealing seat 28 of the gas exchange valve 12 rests on the sealing seat 30 of the sealing slide 10.
  • the sealing slide 10 is carried along until the sealing seat 28 of the gas exchange valve 12 bears against the valve seat ring 22 and the gas exchange valve 12 is closed.
  • the gas exchange valve 12 and thus also the sealing slide 10 follow the cam profile of the camshaft 44.
  • the stop disc 26, which is connected to the sealing slide 10 meets the control slide 34 (state shown in FIG. 1). Thereafter, the sealing slide 10 can no longer follow the cam profile of the camshaft 44.
  • the gas exchange valve 12 lifts off the sealing slide 10 and air can get into the combustion chamber.
  • control slide 34 By axially shifting the position of the control slide 34 via an adjustment unit (not shown), it can be set when the sealing Seat 28 of the gas exchange valve 12 lifts off from the sealing seat 30 of the sealing slide 10. In this advantageous manner, the opening cross section of the gas exchange valve 12 and thus also the amount of air entering the combustion chamber 32 can be regulated.

Abstract

The invention relates to a valve mechanism comprising a variable cross-section of a valve opening. Said valve mechanism is arranged on a flow opening of an internal combustion engine and comprises a gas exchange valve which is actuated by the force of a valve spring and can be displaced back and forth in the axial direction inside a guiding element by means of a valve control unit. The position of the sealing slide can be continuously adjusted in the axial direction in relation to the gas exchange valve by means of an adjustment unit. According to the invention, a sealing slide (10) is arranged coaxially in relation to the gas exchange valve (12). Said slide is actuated by the force of a coupler spring (24), and can be displaced back and forth in the axial direction by means of a valve control unit.

Description

Ventilmechanismus mit einem variablen Ventilöffnungsque schnittValve mechanism with a variable valve opening cross-section
Die Erfindung betrifft einen Ventilmechanismus mit einem variablen Ventilöffnungsquerschnitt mit den im Oberbegriff des Anspruchs 1 genannten Merkmalen.The invention relates to a valve mechanism with a variable valve opening cross section with the features mentioned in the preamble of claim 1.
Stand der TechnikState of the art
Es ist bekannt, als Antriebsmaschine von Kraftfahrzeugen Verbrennungskraftmaschinen einzusetzen. Hierbei wird ein Luft-Kra tstoff-Gemisch in einem Arbeitsraum verdichtet und gezündet. Die hierbei ent- stehende Energie wird in mechanische Arbeit umgesetzt. Bekannt ist, Luft beziehungsweise das Luft- Kraftstoff-Gemisch dem Arbeitsraum über Ventile zuzuführen (Einlassventile) beziehungsweise die Verbrennungsprodukte über Ventile aus dem Arbeitsraum abzu- führen (Auslassventile) . Einer Steuerung dieser Ventile kommt für die Bestimmung eines Wirkungsgrades der Verbrennungskraftmaschine eine große Bedeutung zu. Insbesondere wird über die Steuerung der Ventile der Gaswechsel im Arbeitsraum gesteuert.It is known to use internal combustion engines as the drive machine of motor vehicles. An air-fuel mixture is compressed and ignited in a work area. The resulting energy is converted into mechanical work. It is known to supply air or the air / fuel mixture to the work area via valves (intake valves) or to remove the combustion products from the work area via valves (exhaust valves). Controlling these valves is of great importance for determining an efficiency of the internal combustion engine. In particular, the gas exchange in the work space is controlled via the control of the valves.
Bekannt ist, neben einer Nockenwellensteuerung auch eine elektrohydraulische Ventilsteuerung einzusetzen. Die elektrohydraulische Ventilsteuerung bietet die Möglichkeit einer variablen oder vollvariablen Ventilsteuerung, so dass eine Optimierung des Gaswechsels und somit eine Steigerung des motorischen Wir- kungsgrades der Verbrennungskraftmaschine möglich ist .It is known to use an electro-hydraulic valve control in addition to a camshaft control. The electro-hydraulic valve control offers the possibility of a variable or fully variable valve control, so that an optimization of the gas exchange and thus an increase in the engine efficiency of the internal combustion engine is possible.
Die elektrohydraulische Ventilsteuerung umfasst ein hydraulisch betätigbares Steuerventil, dessen Steuer- ventilkolben einen Ventilkörper der Einlass- beziehungsweise Auslassventile betätigt und gegen einen Ventilsitz (Ventilsitzring) führt (Schließen des Ventils) oder von diesem wegbewegt (Öffnen des Ventils) . Über eine Drucksteuerung eines Hydraulikmediums lässt sich das Steuerventil betätigen. Die Drucksteuerung erfolgt hierbei über in den Hydraulikkreislauf eingebundene Magnetventile. Um möglichst optimale Gaswechsel erreichen zu können, sind möglichst hohe Schaltgeschwindigkeiten des Steuerventils erwünscht. Durch diese hohen Schaltgeschwindigkeiten trifft der Ventilkörper der Einlass- beziehungsweise Auslassventile mit hoher Geschwindigkeit auf den Ventilsitzring. Hierdurch ergibt sich einerseits eine Geräuschentwicklung und die Ventilpartner unterliegen einem relativ hohen Verschleiß.The electrohydraulic valve control comprises a hydraulically actuated control valve, the control valve piston of which actuates a valve body of the intake and exhaust valves and leads against a valve seat (valve seat ring) (closing the valve) or moves it away (opening the valve). The control valve can be actuated by pressure control of a hydraulic medium. The pressure is controlled via solenoid valves integrated in the hydraulic circuit. In order to achieve the best possible gas exchange, the highest possible switching speeds of the control valve are desirable. Due to these high switching speeds, the valve body of the intake and exhaust valves hits the valve seat ring at high speed. This results in noise on the one hand and the valve partners are subject to relatively high wear.
Beispielsweise hat die EP 0 455 761 Bl eine hydraulische Ventilsteuervorrichtung für eine Verbrennungskraftmaschine zum Gegenstand. Das technische Grund- pfinzip dieser Lösung besteht darin, ein Motorventil mittels eines gesteuerten Druckes einer Hydraulikflüssigkeit zu verschieben. Bei dieser Lösung ist vorgesehen, dass ein elektronisches Steuergerät ein Magnetventil ansteuert, das wiederum die Bewegung eines Speicherkolbens steuert, über den der Hub des Motorventils verändert wird.For example, EP 0 455 761 B1 relates to a hydraulic valve control device for an internal combustion engine. The basic technical principle of this solution is to move an engine valve by means of a controlled pressure of a hydraulic fluid. With this solution is provided that an electronic control device controls a solenoid valve, which in turn controls the movement of a storage piston, via which the stroke of the engine valve is changed.
Die EP 0 512 698 AI beschreibt ein einstellbares Ventilsystem für einen Verbrennungsmotor. Diese Lösung stellt ein Beispiel einer mechanischen Ventilsteuerung über Nocken einer rotierenden Nockenwelle dar.EP 0 512 698 AI describes an adjustable valve system for an internal combustion engine. This solution represents an example of a mechanical valve control via cams of a rotating camshaft.
Die OS 4,777,915 hat ein elektromagnetisches Ventilsteuersystem für eine Verbrennungskraftmaschine zum Gegenstand. Eine ähnliche Lösung einer elektromagnetischen Ventilsteuerung ist durch die EP 0 471 614 AI bekannt. Bei diesen Lösungen wird das Ventil durch elektromagnetische Kraft hin- und hergehend in unterschiedliche Positionen bewegt. Die Elektromagneten sind dabei innerhalb eines Gehäuseteiles des Zylinderkopfes in zwei unterschiedlichen Bereichen ange- ordnet. Durch das abwechselnde Aktivieren der Elektromagneten wird das Ventil alternativ- in zwei Endlagen bewegt, die jeweils der Öffnungs- und der Schließstellung des Ventiles entsprechen. In diesen Endlagen des Ventiles ist die Durchlassöffnung zum Verbrennungsraurπ des Luft-Kraftstoff-Gemisches dann am weitesten geöffnet oder völlig verschlossen.OS 4,777,915 relates to an electromagnetic valve control system for an internal combustion engine. A similar solution to an electromagnetic valve control is known from EP 0 471 614 AI. In these solutions, the valve is moved back and forth to different positions by electromagnetic force. The electromagnets are arranged in two different areas within a housing part of the cylinder head. By alternately activating the electromagnets, the valve is alternatively moved into two end positions, each of which corresponds to the opening and closing position of the valve. In these end positions of the valve, the passage opening to the combustion chamber of the air-fuel mixture is then most widely opened or completely closed.
Eine weitere Lösung ist aus der EP 0 551 271 Bl bekannt. Bei dieser Lösung handelt es sich um einen Ventilmechanismus mit einem Tellerventil, das in einem Durchgang eines Verbrennungsmotors angeordnet ist. Das Grundprinzip dieser Lösung besteht in einer Zwei teilung des Ventil tellers , wobei die eine Hälfte des Venti ltellers lediglich einen Teilhub der anderen Hälfte de s Ventiltellers durchführt .Another solution is known from EP 0 551 271 B1. This solution is a valve mechanism with a poppet valve, which is arranged in a passage of an internal combustion engine. The basic principle of this solution is one Two division of the valve plate, with one half of the valve plate only performing a partial stroke of the other half of the valve plate.
Nachte ilig bei diesen bekannten Lösungen zur Ventilsteuerung ist insbes ondere der hohe Aufwand bei der Fertigung und Montage des Ventilmechani smus aufgrund seine s kompli zierten Aufbaus . Dieses wirkt sich negativ auf die Kosten der Fertigung und Montage aus . Des Weiteren s ind bei dies en Lösungen extrem hohe Geschwindigkeiten und große Kräfte zur Ventil steuerung erforderlich , so das s eine erhöhte Störanf älligkeit der Ventilsteuerung auf grund eines starken Vers chleißes der Teile des Ventilmechanismus die unvermeidbare Folge i s t .A disadvantage of these known valve control solutions is, in particular, the high outlay in the manufacture and assembly of the valve mechanism due to its complicated design. This has a negative impact on the costs of production and assembly. Furthermore, these solutions require extremely high speeds and large forces for valve control, so that an increased susceptibility to failure of the valve control due to heavy wear of the parts of the valve mechanism is the inevitable consequence.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Ventilmechanismus mit den kenn- zeichnenden Merkmalen des Hauptanspruchs bietet hingegen den Vorteil,. mit einfachen Mitteln einen variablen Ventilöffnungsquerschnitt zu schaffen. Dadurch, dass koaxial zum Gaswechselventil ein Dichtschieber angeordnet ist, der von der Kraft einer Kop- pelfeder beaufschlagt und durch die Ventilsteuereinheit in axialer Richtung hin- und hergehend verschiebbar ist, wobei vorzugsweise die Position des Dichtschiebers relativ zum Gaswechselventil in axialer Richtung durch eine Verstelleinheit stufenlos einstellbar ist, wird ein Ventilmechanismus geschaffen, der einen einfachen Aufbau aufweist und sicher und dauerhaft funktioniert. Der Vorteil des erfin- dungsgemäßen Ventilmechanismus besteht insbesondere darin, dass ein variabler Ventilöffnungsquerschnitt erzeugt werden kann, wobei jedes einzelne Ventil sich separat regeln lässt. Der variable Ventilöffnungs- Querschnitt lässt sich mit dem erfindungsgemäßεn Ventilmechanismus vorteilhafterweise ohne hohe Geschwindigkeiten und ohne große Kräfte erzeugen, so dass die Störanfälligkeit dieses Ventilmechanismus sehr gering ist. Der erfindungsgemäße Ventilmechanismus kann auf- grund seines einfachen Aufbaus kostengünstig hergestellt und montiert werden. Die Erfindung schafft in vorteilhafter Weise eine variable Ventilsteuerung, durch die eine Optimierung des Gaswechsels und somit eine Steigerung des motorischen Wirkungsgrades der Verbrennungskraftmaschine möglich ist.The valve mechanism according to the invention with the characterizing features of the main claim offers the advantage, however. to create a variable valve opening cross-section with simple means. The fact that a sealing slide is arranged coaxially with the gas exchange valve, which is acted upon by the force of a coupling spring and can be moved back and forth in the axial direction by the valve control unit, the position of the sealing slide relative to the gas exchange valve being preferably infinitely variable in the axial direction by an adjustment unit adjustable, a valve mechanism is created, which has a simple structure and works safely and permanently. The advantage of inventing The valve mechanism according to the invention consists in particular in that a variable valve opening cross section can be produced, each individual valve being able to be regulated separately. The variable valve opening cross section can advantageously be produced with the valve mechanism according to the invention without high speeds and without great forces, so that the susceptibility to failure of this valve mechanism is very low. The valve mechanism according to the invention can be manufactured and assembled inexpensively due to its simple structure. The invention advantageously creates a variable valve control, by means of which an optimization of the gas exchange and thus an increase in the motor efficiency of the internal combustion engine is possible.
In bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass die Ventilsteuereinheit eine Nockenwelle ist.In a preferred embodiment of the invention it is provided that the valve control unit is a camshaft.
In weiterer bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass das Gaswechselventil einen rotationssymmetrischen Grundaufbau hat und aus einem Ven-' tilschaft besteht, an dessen unterem Ende ein Ventil- teller angeordnet ist.In another preferred embodiment of the invention it is provided that the gas exchange valve has a rotationally symmetrical basic structure and is composed of a tilschaft VEN ', a valve plate disposed at the lower end.
Nach weiterer bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass der Ventilteller eine konische ümfangsfläche aufweist, die den Dichtsitz des Gas- echselventils bildet. Ferner ist in bevorzug er Ausgestaltung der Erfindung vorgesehen, dass in Schließstellung des Ventilmechanismus der Dichtsitz des Gaswechselventils jeweils unmittelbar an einem Dichtsitz des Dichtschiebers und an einem Ventilsitzring des Zylinderkopfes anliegt:.According to a further preferred embodiment of the invention, it is provided that the valve plate has a conical circumferential surface which forms the sealing seat of the gas exchange valve. Furthermore, in a preferred embodiment of the invention it is provided that in the closed position of the valve mechanism, the sealing seat of the gas exchange valve is in each case in direct contact with a sealing seat of the sealing slide and with a valve seat ring of the cylinder head:
Darüber hinaus ist bevorzugter Ausgestaltung der Erfindung vorgesehen, dass der Dichtschieber aus einem buchsenförmigen Lagerkörper besteht, der innerhalb einer Führung des Zylinderkopfes axial hin- und hergehend verschiebbar angeordnet ist.In addition, a preferred embodiment of the invention provides that the sealing slide consists of a bush-shaped bearing body which is arranged such that it can be moved axially back and forth within a guide of the cylinder head.
Durch diese vorteilhaften Ausgestaltungen der Erfindung kann die Zufuhr des Luft-Kraftstoff-Gemisches mit einer großen Genauigkeit geregelt und damit ein hoher Wirkungsgrad der Verbrennungskraftmaschine erreicht werden.By means of these advantageous refinements of the invention, the supply of the air-fuel mixture can be regulated with great accuracy and thus a high degree of efficiency of the internal combustion engine can be achieved.
Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den in den Unteransprüchen genannten Merkmalen .Further advantageous refinements of the invention result from the features mentioned in the subclaims.
Zeichnungendrawings
Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand der zugehörigen Zeichnungen näher erläutert. Es zeigen:The invention is explained in more detail in an exemplary embodiment with reference to the accompanying drawings. Show it:
Figur 1 einen Schnitt durch einen Zylinderkopf mit dem erfindungsgemäßen Ventilmechanismus und Figur 2 eine Perspektivansicht eines Dichtschiebers des erfindungsgemäßen Ventilmechanismus. Beschreibung des Ausführungsbeispiels1 shows a section through a cylinder head with the valve mechanism according to the invention and Figure 2 is a perspective view of a sealing slide of the valve mechanism according to the invention. Description of the embodiment
In den beiden Figuren sind die einzelnen Teile des erfindungsgemäßen Ventilmechanismus schematisch und nur mit den für die Erfindung wesentlichen Bestandteilen dargestellt. Gleiche Teile des erfindungsgemäßen Ventilmechanismus sind in den Figuren mit glei- chen Bezugszeichen versehen und werden in der Regel jeweils nur einmal beschrieben.In the two figures, the individual parts of the valve mechanism according to the invention are shown schematically and only with the components essential for the invention. Identical parts of the valve mechanism according to the invention are provided with the same reference symbols in the figures and are generally only described once.
In Figur 1 ist der erfindungsgemäße Ventilmechanismus in seiner Anordnung im Zylinderkopf 18 eines Verbren- nungsmotors dargestellt. Der Ventilmechanismus weist ein Gaswechselventil 12 auf, das von der Kraft einer Ventilfeder 16 beaufschlagt ist. Das Gaswechselventil 12 ist innerhalb einer Führung axial hin- und hergehend verschiebbar, wobei die Verschiebebewegung durch eine Ventilsteuereinheit erzeugt wird. In bevorzugter Ausgestaltung der Erfindung ist als Ventilsteuereinheit eine Nockenwelle (nicht dargestellt) vorgesehen.The valve mechanism according to the invention is shown in FIG. 1 in its arrangement in the cylinder head 18 of an internal combustion engine. The valve mechanism has a gas exchange valve 12 which is acted upon by the force of a valve spring 16. The gas exchange valve 12 can be displaced axially back and forth within a guide, the displacement movement being generated by a valve control unit. In a preferred embodiment of the invention, a camshaft (not shown) is provided as the valve control unit.
Das Gaswechselventil 12 hat einen rotationssy metri- sehen Grundaufbau und besteht aus einem Ventilschaft 14, an dessen unterem Ende ein Ventilteller 20 angeordnet ist. Die Figur 1 zeigt den Ventilmechanismus in der Schließstellung des Gaswechselventils 12. Dabei liegt der Dichtsitz 28 des Gaswechselventils 12 jeweils unmittelbar an einem Dichtsitz 30 des Dichtschiebers 10 und an einem Ventilsitzring 22 des Zylinderkopfes 18 an. Aufbau und Wirkungsweise von Gaswechselventilen 12 an sich sind allgemein bekannt, so dass hierauf im Rahmen der vorliegenden Beschreibung nicht näher einge- gangen werden soll.The gas exchange valve 12 has a rotationally symmetrical basic structure and consists of a valve stem 14, on the lower end of which a valve disk 20 is arranged. FIG. 1 shows the valve mechanism in the closed position of the gas exchange valve 12. The sealing seat 28 of the gas exchange valve 12 is in each case in direct contact with a sealing seat 30 of the sealing slide 10 and with a valve seat ring 22 of the cylinder head 18. The structure and mode of operation of gas exchange valves 12 per se are generally known, so that this will not be dealt with in more detail in the present description.
Die Erfindung sieht vor, dass koaxial zum Gaswechselventil 12 ein Dichtschieber 10 angeordnet ist. Der Dichtschieber 10 ist von der Kraft einer Koppelfeder 24 beaufschlagt und axial hin- und hergehend verschiebbar. Die Verschiebebewegung des Dichtschiebers 10 wird ebenfalls durch die Nockenwelle (nicht dargestellt) , von der die Verschiebebewegung des Gaswechselventils 12 gesteuert wird, erzeugt.The invention provides that a sealing slide 10 is arranged coaxially with the gas exchange valve 12. The sealing slide 10 is acted upon by the force of a coupling spring 24 and can be moved axially back and forth. The displacement movement of the sealing slide 10 is also generated by the camshaft (not shown), by which the displacement movement of the gas exchange valve 12 is controlled.
In Figur 2 ist der Dichtschieber 10 schematisch in einer Perspektivansicht dargestellt. Der Dichtschieber 10 besteht im Wesentlichen aus einem Lagerkörper 40 und einem Dichtkörper 38. Der Lagerkörper 40 des Dichtschiebers 10 ist buchsenförmig ausgebildet und innerhalb einer Führung des Zylinderkopfes 18 axial hin- und hergehend verschiebbar angeordnet. Am unteren Ende weist der Dichtschieber 10 einen zylinder- förmigen Dichtkörper 38 auf, dessen Außenfläche den Dichtsitz 30 bildet. Der Dichtkörper 38 ist mit dem Lagerkörper 40 über Verbindungsstangen 42 verbunden.In Figure 2, the sealing slide 10 is shown schematically in a perspective view. The sealing slide 10 consists essentially of a bearing body 40 and a sealing body 38. The bearing body 40 of the sealing slide 10 is bush-shaped and is arranged so that it can be moved axially back and forth within a guide of the cylinder head 18. At the lower end, the sealing slide 10 has a cylindrical sealing body 38, the outer surface of which forms the sealing seat 30. The sealing body 38 is connected to the bearing body 40 via connecting rods 42.
Am Lagerkörper 40 ist nahe seinem oberen Ende eineOn the bearing body 40 is near its upper end
Anschlagscheibe 26 befestigt. Zur Erleichterung der Montage besteht diese Anschlagscheibe 26 aus zweiStop disc 26 attached. To facilitate assembly, this stop disc 26 consists of two
Teilen. Die beiden Teile der Anschlagscheibe 26 sind von einem Spannring 36 umgeben, durch den sie zusammengehalten werden.Divide. The two parts of the stop disk 26 are surrounded by a clamping ring 36, by which they are held together.
Die Verbindung zwischen dem Dichtkörper 38 und dem Lagerkörper 40 ist so ausgelegt, 'dass ausreichend Raum für die durchströmende Luft beziehungsweise für das Luft-Kraftstoff-Gemisch bleibt. Sowohl für den Einlass als auch für den Auslass der Luft beziehungsweise des Luft-Kraftsto f-Gemisches ist dadurch in vorteilhafter Weise innerhalb des Dichtschiebers 10 eine ausreichend große Durchlassöffnung zum ungehinderten Durchströmen dieses Mediums vorhanden.The connection between the sealing body 38 and the bearing body 40 is designed such that there is sufficient space for the air flowing through or for the air-fuel mixture. Both for the inlet and for the outlet of the air or of the air-fuel mixture, there is advantageously a sufficiently large passage opening within the sealing slide 10 for the unhindered flow of this medium.
Der in den Figuren 1 und 2 dargestellte Ventilmecha- nismus zeigt folgende Funktion:The valve mechanism shown in FIGS. 1 and 2 has the following function:
Durch die Ventilsteuereinheit, die in bevorzugter Ausgestaltung der Erfindung eine Nockenwelle (nicht dargestellt) ist, kann das Gaswechselventil 12 ent- weder geöffnet ' oder geschlossen werden. Das Gaswechselventil 12 wird wie bei einem herkömmlichen Ventiltrieb über die Nockenwelle am Ventilschaft 14 nach unten gedrückt und dabei der Bewegungsverlauf des Gaswechselventils 12 gesteuert. Hierfür sind alle bekannten Verfahren, die auf den technischen Prinzipien des Tassenstößels, Kipphebels, Schlepphebels und dergleichen basieren, anwendbar.The gas control valve 12 can either be opened or closed by the valve control unit, which is a camshaft (not shown) in a preferred embodiment of the invention. As in a conventional valve train, the gas exchange valve 12 is pressed down via the camshaft on the valve stem 14 and the course of movement of the gas exchange valve 12 is controlled in the process. All known methods based on the technical principles of the bucket tappet, rocker arm, rocker arm and the like can be used for this.
Die Nockenwelle 44 arbeitet gegen die Rückstellkraft der Ventilfeder 16, die sich am Zylinderkopf 18 und am Ventilteller 20, der sich mit dem GaswechselventilThe camshaft 44 works against the restoring force of the valve spring 16, which is on the cylinder head 18 and on the valve plate 20, which is in contact with the gas exchange valve
12 mitbewegt, abstützt. Durch Drehung der Nockenwelle 44 wird das Gaswechselventil 12 nach unten gedrückt, und der Dichtsitz 28 des Gaswechselventils 12 hebt vom Ventilsitzring 22 ab.12 moved, supported. By rotating the camshaft 44, the gas exchange valve 12 is pressed down, and the sealing seat 28 of the gas exchange valve 12 lifts off the valve seat ring 22.
Über die Koppelfeder 24, die unter einer bestimmten Vorspannung steht, wird der Dichtschieber 10 mitbe- wegt . Die Koppelfeder 24 stützt sich am Ventilteller 20 und an der Anschlagscheibe 26, die mit dem Dichtschieber 10 verbunden ist, ab. Hierdurch wird der Dichtsitz 30 des Dichtschiebers 10 auf den Dichtsitz 28 des Gaswechselventils 12 gedrückt. Da zwischen dem Dichtkörper 38 und dem Ventilsitzring 22 eine Ringspaltdichtung besteht, kann nur eine sehr geringe Luftmenge (Leckage) in den Brennraum 32 gelangen.The sealing slide 10 is also moved via the coupling spring 24, which is under a certain pretension. The coupling spring 24 is supported on the valve plate 20 and on the stop disk 26, which is connected to the sealing slide 10. As a result, the sealing seat 30 of the sealing slide 10 is pressed onto the sealing seat 28 of the gas exchange valve 12. Since there is an annular gap seal between the sealing body 38 and the valve seat ring 22, only a very small amount of air (leakage) can get into the combustion chamber 32.
Das Gaswechselventil 12 und damit auch der Dichtschieber 10 folgen dem Nockenverlauf, bis die An- schlagscheibe 26 auf den Regelschieber 34 auftrifft.The gas exchange valve 12 and thus also the sealing slide 10 follow the course of the cam until the stop disk 26 hits the control slide 34.
Der Regelschieber 34 ist in axialer Richtung des Ventilschaftes 14 in seiner Ausgangsposition relativ- zum Gaswechselventil 12 verstellbar. Die Verstellung kann elektrisch, 'hydraulisch oder auch pneumatisch erfolgen. Der Regelschieber 34 kann nur über eine entspre- chende Verstelleinheit (nicht dargestellt) verstellt werden. Ansonsten bleibt die Position des Regelschiebers 34 innerhalb des Ventilmechanismus fix, auch wenn von außen Kräfte auf ihn einwirken. Die Verstelleinheiten können jeweils elektrisch, hydraulisch oder auch pneumatisch betätigbar sein. Sobald die Anschlagscheibe 26 auf den Regelschieber 34 auftrifft, kann der Dichtschieber 10 keine Bewegung in Öffnungsrichtung des Gaswechselventils 12 mehr durchführen. Da das Gaswechselventil 12 durch die Nockenwelle weiter bewegt wird, hebt der Dichtsitz 28 des Gaswechselventils 12 vom Dichtsitz 30 des Dichtschiebers 10 ab, wobei Luft in den Brennraum 32 eindringen kann. Die Koppelfeder 24 wird dabei zusammengedrückt .The control slide 34 is adjustable in the axial direction of the valve stem 14 in its starting position relative to the gas exchange valve 12. The adjustment can be electric, 'hydraulically or pneumatically. The control slide 34 can only be adjusted via an appropriate adjustment unit (not shown). Otherwise, the position of the control slide 34 remains fixed within the valve mechanism, even if external forces act on it. The adjusting units can each be actuated electrically, hydraulically or pneumatically. As soon as the stop disk 26 strikes the control slide 34, the sealing slide 10 can no longer perform any movement in the opening direction of the gas exchange valve 12. Since the gas exchange valve 12 is moved further by the camshaft, the sealing seat 28 of the gas exchange valve 12 lifts off from the sealing seat 30 of the sealing slide 10, air being able to penetrate into the combustion chamber 32. The coupling spring 24 is compressed.
Folgt das Gaswechselventil 12 der Schließflanke der Nockenwelle, wird es durch die Ventilfeder 16 in Schließrichtung gedrückt. Der Dichtsitz 28 des Gaswechselventils 12 legt sich am Dichtsitz 30 des Dichtschiebers 10 an. Der Dichtschieber 10 wird mitgenommen, bis der Dichtsitz 28 des Gaswechselventils 12 am Ventilsitzring 22 anliegt und das Gaswechsel- ventil 12 geschlossen ist.If the gas exchange valve 12 follows the closing flank of the camshaft, it is pressed in the closing direction by the valve spring 16. The sealing seat 28 of the gas exchange valve 12 rests on the sealing seat 30 of the sealing slide 10. The sealing slide 10 is carried along until the sealing seat 28 of the gas exchange valve 12 bears against the valve seat ring 22 and the gas exchange valve 12 is closed.
Das Gaswechselventil 12 und somit auch der Dicht- schieber 10 folgen dem Nockenverlauf der Nockenwelle 44. Zu einem bestimmten Zeitpunkt trifft die Anschlagscheibe 26, die mit dem Dichtschieber 10 verbunden ist, auf -den Regelschieber 34 (in Figur 1 dar- gestellter Zustand) . Danach kann der Dichtschieber 10 dem Nockenverlauf der Nockenwelle 44 nicht mehr folgen. Das Gaswechselventil 12 hebt vom Dichtschieber 10 ab und Luft kann in den Brennraum gelangen.The gas exchange valve 12 and thus also the sealing slide 10 follow the cam profile of the camshaft 44. At a certain point in time, the stop disc 26, which is connected to the sealing slide 10, meets the control slide 34 (state shown in FIG. 1). Thereafter, the sealing slide 10 can no longer follow the cam profile of the camshaft 44. The gas exchange valve 12 lifts off the sealing slide 10 and air can get into the combustion chamber.
Durch axiales Verschieben der Position des Regelschiebers 34 über eine Verstelleinheit (nicht dargestellt) kann eingestellt werden, wann sich der Dicht- sitz 28 des Gaswechselventils 12 vom Dichtsitz 30 des Dichtschiebers 10 abhebt. Auf diese vorteilhafte Weise lässt sich der Öffnungsquerschnitt des Gaswechselventils 12 und somit auch die Menge der in den Brennraurn 32 gelangenden Luft regeln. By axially shifting the position of the control slide 34 via an adjustment unit (not shown), it can be set when the sealing Seat 28 of the gas exchange valve 12 lifts off from the sealing seat 30 of the sealing slide 10. In this advantageous manner, the opening cross section of the gas exchange valve 12 and thus also the amount of air entering the combustion chamber 32 can be regulated.

Claims

Patentansprüche claims
1. Ventilmechanismus mit einem variablen Ventilöffnungsquerschnitt, wobei der Ventilmechanismus an einer Durchlassöffnung einer Verbrennungskraftmaschi- ne angeordnet ist und ein Gaswechselventil aufweist, das von der Kraft einer Ventilfeder beaufschlagt und durch eine Ventilsteuereinheit innerhalb einer Führung in axialer Richtung hin- und hergehend verschiebbar ist, dadurch gekennzeichnet, dass koaxial zum Gaswechselventil (12) ein Dichtschieber (10) angeordnet ist, der von der Kraft einer Koppelfeder (24) beaufschlagt und durch die Ventilsteuereinheit in axialer Richtung hin- und hergehend verschiebbar ist .1. Valve mechanism with a variable valve opening cross section, the valve mechanism being arranged at a passage opening of an internal combustion engine and having a gas exchange valve which is acted upon by the force of a valve spring and can be moved back and forth within a guide in the axial direction by a valve control unit, thereby characterized in that a sealing slide (10) is arranged coaxially with the gas exchange valve (12) and is acted upon by the force of a coupling spring (24) and can be moved back and forth in the axial direction by the valve control unit.
2. Ventilmechanismus nach Anspruch 1, dadurch gekennzeichnet, dass die Position des Dichtschiebers (10) stufenlos einstellbar ist.2. Valve mechanism according to claim 1, characterized in that the position of the sealing slide (10) is infinitely adjustable.
3. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ventilsteuereinheit vorzugsweise eine Nockenwelle ist.3. Valve mechanism according to one of the preceding claims, characterized in that the valve control unit is preferably a camshaft.
4. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennseiαhnet, dass das Gaswechselventil (12) einen rotationssymmetrischen Grundaufbau hat und aus einem Ventilschaft (14) besteht, an dessen unterem Ende ein Ventilteller (20) angeordnet ist .4. Valve mechanism according to one of the preceding claims, characterized gekennseiαhnet that the gas exchange valve (12) has a rotationally symmetrical basic structure and consists of a valve stem (14) the lower end of which is arranged a valve disk (20).
5. Ventilmechanismus nach Anspruch 4, dadurch gekenn- zeichnet, dass der Ventilteller (20) eine konische5. Valve mechanism according to claim 4, characterized in that the valve plate (20) is a conical
Umfangsf lache aufweist, die den Dichtsitz (28) des Gaswechselventils (12) bildet.Has circumferential surface which forms the sealing seat (28) of the gas exchange valve (12).
6. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in Schließstellung des Ventilmechanismus der Dichtsitz (28) des Gaswechselventils (12) jeweils unmittelbar an einem Dichtsitz (30) des Dichtschiebers (10) und an einem Ventilsitzring (22) des Zylinderkopfes (18) anliegt.6. Valve mechanism according to one of the preceding claims, characterized in that in the closed position of the valve mechanism, the sealing seat (28) of the gas exchange valve (12) in each case directly on a sealing seat (30) of the sealing slide (10) and on a valve seat ring (22) of the cylinder head ( 18) is present.
7. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtschieber (10) aus einem buchsenförmigen Lagerkörper (40) besteht, der innerhalb einer Führung des Zylin- derkopfes (18) axial hin- und hergehend verschiebbar angeordnet ist.7. Valve mechanism according to one of the preceding claims, characterized in that the sealing slide (10) consists of a bush-shaped bearing body (40) which is arranged axially displaceably back and forth within a guide of the cylinder head (18).
8. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der buchsen- förmige Lagerkörper (40) des Dichtschiebers (10) die Führung des Gaswechselventils (12) bildet, innerhalb der das Gaswechselventil (12) axial hin- und hergehend . verschiebbar ist.8. Valve mechanism according to one of the preceding claims, characterized in that the bush-shaped bearing body (40) of the sealing slide (10) forms the guide of the gas exchange valve (12) within which the gas exchange valve (12) reciprocates axially. is movable.
9. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtschieber (10) an seinem unteren Ende einen zylinder- förmigen Dichtkörper (38) aufweist, dessen Außenfläche den Dichtsitz (30) bildet.9. Valve mechanism according to one of the preceding claims, characterized in that the sealing slide (10) at its lower end a cylindrical shaped sealing body (38), the outer surface of which forms the sealing seat (30).
10. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtkörper (38) über Verbindungsstangen (42) mit dem Lagerkörper (40) verbunden ist.10. Valve mechanism according to one of the preceding claims, characterized in that the sealing body (38) via connecting rods (42) is connected to the bearing body (40).
11. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Lagerkörper (40) des Dichtschiebers, nahe seinem oberen Ende, eine Anschlagscheibe (26) befestigt ist.11. Valve mechanism according to one of the preceding claims, characterized in that on the bearing body (40) of the sealing slide, near its upper end, a stop disc (26) is attached.
12. Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Anschlagscheibe (26) aus zwei Teilen besteht.12. Valve mechanism according to one of the preceding claims, characterized in that the stop disc (26) consists of two parts.
13.' Ventilmechanismus nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zwei Teile der Anschlagscheibe (26) von einem Spannring (36) umgeben sind. 13. ' Valve mechanism according to one of the preceding claims, characterized in that the two parts of the stop disc (26) are surrounded by a clamping ring (36).
EP02737829A 2001-08-21 2002-05-03 Valve mechanism comprising a variable cross-section of a valve opening Expired - Lifetime EP1421262B1 (en)

Applications Claiming Priority (3)

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DE10140941A DE10140941A1 (en) 2001-08-21 2001-08-21 Valve mechanism with a variable valve opening cross section
DE10140941 2001-08-21
PCT/DE2002/001602 WO2003018967A1 (en) 2001-08-21 2002-05-03 Valve mechanism comprising a variable cross-section of a valve opening

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EP1421262A1 true EP1421262A1 (en) 2004-05-26
EP1421262B1 EP1421262B1 (en) 2008-05-28

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EP (1) EP1421262B1 (en)
JP (1) JP2005500462A (en)
KR (1) KR20040030159A (en)
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CN108060951B (en) * 2017-11-29 2020-01-10 大连理工大学 Variable-mode continuously variable valve mechanism

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KR20040030159A (en) 2004-04-08
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JP2005500462A (en) 2005-01-06
US6886513B2 (en) 2005-05-03
EP1421262B1 (en) 2008-05-28
WO2003018967A1 (en) 2003-03-06
US20040050354A1 (en) 2004-03-18

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