DE4225796C2 - Valve train for charge exchange valves of reciprocating internal combustion engines - Google Patents

Valve train for charge exchange valves of reciprocating internal combustion engines

Info

Publication number
DE4225796C2
DE4225796C2 DE19924225796 DE4225796A DE4225796C2 DE 4225796 C2 DE4225796 C2 DE 4225796C2 DE 19924225796 DE19924225796 DE 19924225796 DE 4225796 A DE4225796 A DE 4225796A DE 4225796 C2 DE4225796 C2 DE 4225796C2
Authority
DE
Germany
Prior art keywords
tappet
cam
contour
valve train
engagement
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 - Fee Related
Application number
DE19924225796
Other languages
German (de)
Other versions
DE4225796A1 (en
Inventor
Bertold Dr Ing Mayr
Joachim Dr Ing Boehme
Leopold Dipl Ing Mueller
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.)
IAV Motor GmbH
Original Assignee
IAV Motor 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
Priority to DE19924213856 priority Critical patent/DE4213856C2/en
Priority claimed from DE19924213856 external-priority patent/DE4213856C2/en
Application filed by IAV Motor GmbH filed Critical IAV Motor GmbH
Priority to DE19924225796 priority patent/DE4225796C2/en
Priority to US08/318,832 priority patent/US5555861A/en
Priority to PCT/DE1993/000357 priority patent/WO1993022543A1/en
Publication of DE4225796A1 publication Critical patent/DE4225796A1/en
Application granted granted Critical
Publication of DE4225796C2 publication Critical patent/DE4225796C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts

Description

Die Erfindung bezieht sich auf einen Ventiltrieb für Ladungswechselventile gemäß dem Hauptpatent DE 42 13 856.The invention relates to a valve train for charge exchange valves according to the main patent DE 42 13 856.

Bekannt ist durch dieses Patent, daß eine steuerbare Mitnehmeranordnung entweder im zentralen Stößel oder im Tassenstößel geführte nach außen oder innen durch ein oder mehrere Sperrelemente verlagerbare Mitnehmer aufweist. Dabei sind den Mitnehmern in einer Ebene quer zur Achse der Stößel entweder konkave Innenkonturen am Tassenstößel oder konkave Außenkonturen am zentralen Stößel zugeordnet, die im Bereich der Grundkreise beider Nocken einen Eingriff der Mitnehmer zulassen. Hierzu sind mehrere konstruktive Ausführungen beschrieben.It is known from this patent that a controllable driver arrangement either in the central The tappet or the tappet is guided outwards or inwards by one or more locking elements has displaceable carriers. The drivers are in a plane transverse to the axis of the Ram either concave inner contours on the cup tappet or concave outer contours on the assigned central tappet, which engages in the area of the base circles of both cams Allow carriers. Several constructive designs are described for this.

Es erwies sich, daß ein einstufiger Übergang zwischen Verlagerungs- und Sperrkontur am Sperr­ element nachteilig ist, wenn er eine relativ steile Steigung aufweist. It turned out that a one-step transition between the displacement and locking contour at the locking element is disadvantageous if it has a relatively steep slope.  

Der Erfindung liegt die Aufgabe zugrunde, im Zustand des Sperrens die Mitnehmer spielfrei zu halten und einen gleitenden Übergang in diesen Zustand zu erreichen Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die in der Außenseite der Sperrelemente eingebrachte Verlagerungskontur überwellenförmige Stufen unterschiedlicher Tiefe zur Sperrkontur ansteigt.The invention has for its object in the state of locking the driver free of play hold and achieve a smooth transition to this state According to the invention the object is achieved in that in the outside of the locking elements introduced displacement contour undulating steps of different depth to the blocking contour increases.

Vorteilhaft wird durch eine geringe Steigung der Sperrkontur in Sperr-Richtung ein Klemmen erzielt.A small slope of the blocking contour in the blocking direction is advantageous for clamping achieved.

Anhand einer Zeichnung ist nachfolgend ein Ausführungsbeispiel der Erfindung beschrieben.An exemplary embodiment of the invention is described below with reference to a drawing.

Es zeigen:Show it:

Fig. 1 einen Schnitt durch die Mitnehmereinrichtung Fig. 1 shows a section through the driver device

Fig. 2 einen teilweisen Längsschnitt durch ein Sperrelement. Fig. 2 shows a partial longitudinal section through a locking element.

In Fig. 1 ist ein vergrößerter Ausschnitt eines Tassenstößels dargestellt. Es ist das Zusammenwirken von Mitnehmer 8 und Sperrelement 9 zu erkennen. In der Darstellung ist der zentrale Stößel 4 mittels des Mitnehmers 8 mit dem Tassenstößel 6 verbunden. Der Mitnehmer 8 steht mit der kon­ kaven Innenkontur an der zylindrischen Wand des Tassenstößels 6 im Eingriff. In Fig. 1, an enlarged section of a tappet is shown. The interaction of driver 8 and locking element 9 can be seen. In the illustration, the central tappet 4 is connected to the tappet 6 by means of the driver 8 . The driver 8 is in engagement with the con cave inner contour on the cylindrical wall of the tappet 6 .

Fig. 2 zeigt einen teilweisen Längsschnitt durch ein Sperrelement 9. Hierbei ist der mehrfache gleitende Übergang mittels wellenförmiger Stufen 9c zwischen der Verlagerungskontur 9a (Rast­ stellung) und der Sperrkontur 9b (Sperrstellung) erreicht. Ein derartiger Übergang zwischen Rad- und Sperrstellung läßt bei hohen Motordrehzahlen kurze Schaltzeiten zwischen den beiden Stel­ lungen zu. Das erfordert einen Anstieg von Stufe zu Stufe mit einem Winkel α von vorzugsweise bis 30°. Durch die mit dem Winkel β angehobene Sperrkontur 9b erfolgt in Sperrichtung ein spielfreies Klemmen zwischen dem zentralen Stößel 4, Sperrelement 9, Mitnehmer 8 und Tassen­ stößels 6. Fig. 2 shows a partial longitudinal section through a locking element 9. Here, the multiple smooth transition is achieved by means of wavy steps 9 c between the displacement contour 9 a (locking position) and the locking contour 9 b (locking position). Such a transition between the wheel and locking position allows short switching times between the two positions at high engine speeds. This requires an increase from step to step with an angle α of preferably up to 30 °. Due to the locking contour 9 b raised by the angle β, play-free clamping takes place in the locking direction between the central tappet 4 , locking element 9 , driver 8 and cup tappet 6 .

Claims (4)

1. Ventiltrieb für Ladungswechselventile von Hubkolbenbrennkraftmaschinen mit folgendem Aufbau:1. Valve train for charge exchange valves of reciprocating piston internal combustion engines with the following structure: einem Ventil sind auf einer Nockenwelle zwei Nocken unterschiedlicher Hubcharak­ teristik für geringes und größtes Öffnen zugeordnet, wobei am ersten, für geringes Öffnen vorgesehenen Nocken beidseitig Nockenhälften des zweiten, für größtes Öffnen vorge­ sehenen Nockens angrenzen,
ein Tassenstößel (6) ist im Zylinderkopf geführt und steht kraftschlüssig mit den Nocken­ hälften des zweiten Nockens im Eingriff,
ein zentraler, im Tassenstößel (6) geführter Stößel (4) steht mit dem ersten Nocken im Eingriffe in dem, mit dem Nocken für geringes Öffnen im Eingriff stehenden zentralen Stößel (4) ist eine mechanische oder hydraulische Spielausgleichsvorrichtung angeordnet, die gegen das Ventil abgestützt ist,
eine hydraulisch schaltbare Mitnehmeranordnung ist zwischen dem zentralen Stößel (4) und dem Tassenstößel (6) angeordnet und weist in einem dieser Stößel (4 oder 6) radial geführte, verlagerbare Mitnehmer (8) auf, die in Gegenkonturen des jeweils anderen Stößels (6 oder 4) im Bereich der Grundkreise beider Nocken in Eingriff bringbar sind, in einer Ebene sind senkrecht zu der gemeinsamen Achse der Stößel (4; 6) und neben dieser durch Druckmittel verschiebbare Sperrelemente (9) gelagert, die die mit einer konvexen Eingriffs­ kontur ausgestatteten Mitnehmer (8) sperren oder freigeben, wobei die Sperrelemente (9) unterschiedliche Konturen zum Verlagern der Mitnehmer (8) aufweisen; gemäß Hauptpatent DE 42 13 856, dadurch gekennzeichnet,
daß die in der Außenseite der Sperrelemente (9) eingebrachte Verlagerungskontur (9a; 9b; 9c) über wellenförmige Stufen unterschiedlicher Tiefe zur Sperrkontur (9b) ansteigt. a valve, two cams of different stroke characteristics are assigned to a camshaft for low and maximum opening, with cam halves of the second cam provided for maximum opening bordering on both sides of the first cam provided for low opening,
a bucket tappet ( 6 ) is guided in the cylinder head and is non-positively engaged with the cam halves of the second cam,
a central tappet ( 4 ) guided in the cup tappet ( 6 ) is in engagement with the first cam; in the central tappet ( 4 ), which is in engagement with the cam for little opening, a mechanical or hydraulic play compensation device is arranged, which is supported against the valve is
A hydraulically switchable driver arrangement is arranged between the central tappet ( 4 ) and the cup tappet ( 6 ) and has, in one of these tappets ( 4 or 6 ), radially guided, displaceable drivers ( 8 ), which are in opposite contours of the other tappet ( 6 or 4 ) can be brought into engagement in the area of the base circles of the two cams, in one plane perpendicular to the common axis of the plunger ( 4 ; 6 ) and in addition to this, by means of pressure elements displaceable locking elements ( 9 ) are mounted, which are equipped with a contour with a convex engagement driver ( 8 ) lock or unlock, the locking elements ( 9 ) having different contours for moving the drivers ( 8 ); according to main patent DE 42 13 856, characterized in that
that the displacement contour ( 9 a; 9 b; 9 c) introduced in the outside of the locking elements ( 9 ) rises over undulating steps of different depths to the locking contour ( 9 b). 2. Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, daß der Anstieg in jeder Stufe einen Winkel α bis 30° in Sperrichtung aufweist.2. Valve train according to claim 1, characterized, that the increase in each stage has an angle α to 30 ° in the reverse direction. 3. Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, daß die Sperrkontur (9b) eine Neigung entsprechend einem Klemmwinkel (β) in Sperrichtung aufweist.3. Valve train according to claim 1, characterized in that the locking contour ( 9 b) has an inclination corresponding to a clamping angle (β) in the blocking direction.
DE19924225796 1992-04-27 1992-07-31 Valve train for charge exchange valves of reciprocating internal combustion engines Expired - Fee Related DE4225796C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19924213856 DE4213856C2 (en) 1992-04-27 1992-04-27 Valve train for charge exchange valves, of reciprocating piston internal combustion engines
DE19924225796 DE4225796C2 (en) 1992-04-27 1992-07-31 Valve train for charge exchange valves of reciprocating internal combustion engines
US08/318,832 US5555861A (en) 1992-04-27 1993-04-22 Drive for gas exchange valves, preferably inlet valves for reciprocating internal combustion engines
PCT/DE1993/000357 WO1993022543A1 (en) 1992-04-27 1993-04-22 Drive for gas exchange valves, preferably inlet valves of reciprocating internal combustion engines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924213856 DE4213856C2 (en) 1992-04-27 1992-04-27 Valve train for charge exchange valves, of reciprocating piston internal combustion engines
DE19924225796 DE4225796C2 (en) 1992-04-27 1992-07-31 Valve train for charge exchange valves of reciprocating internal combustion engines

Publications (2)

Publication Number Publication Date
DE4225796A1 DE4225796A1 (en) 1994-02-03
DE4225796C2 true DE4225796C2 (en) 1995-09-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924225796 Expired - Fee Related DE4225796C2 (en) 1992-04-27 1992-07-31 Valve train for charge exchange valves of reciprocating internal combustion engines

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DE (1) DE4225796C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102778A1 (en) * 2018-02-08 2019-08-08 Schaeffler Technologies AG & Co. KG Switchable cam follower of a valve train of an internal combustion engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904681A1 (en) * 1989-02-16 1990-08-23 Bayerische Motoren Werke Ag Device for the variable timing of the same type of lift valve for each combustion chamber of an internal combustion engine
US5090364A (en) * 1990-12-14 1992-02-25 General Motors Corporation Two-step valve operating mechanism
DE4210567B4 (en) * 1991-04-15 2004-03-25 Volkswagen Ag Variable valve train for a lifting valve of a machine

Also Published As

Publication number Publication date
DE4225796A1 (en) 1994-02-03

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