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DE19960742A1 - Variable valve drive, preferably for combustion engine, has pressure roller rotatably mounted in swinging arm with pivot axis fixed relative to cylinder head but adjustable in position - Google Patents

Variable valve drive, preferably for combustion engine, has pressure roller rotatably mounted in swinging arm with pivot axis fixed relative to cylinder head but adjustable in position

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Publication number
DE19960742A1
DE19960742A1 DE19960742A DE19960742A DE19960742A1 DE 19960742 A1 DE19960742 A1 DE 19960742A1 DE 19960742 A DE19960742 A DE 19960742A DE 19960742 A DE19960742 A DE 19960742A DE 19960742 A1 DE19960742 A1 DE 19960742A1
Authority
DE
Germany
Prior art keywords
variable valve
pressure roller
cylinder head
valve train
train according
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
DE19960742A
Other languages
German (de)
Other versions
DE19960742B4 (en
Inventor
Leopold Mueller
Heiko Neukirchner
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 GmbH Ingenieurgesellschaft Auto und Verkehr
Original Assignee
IAV GmbH Ingenieurgesellschaft Auto und Verkehr
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 IAV GmbH Ingenieurgesellschaft Auto und Verkehr filed Critical IAV GmbH Ingenieurgesellschaft Auto und Verkehr
Priority to DE19960742A priority Critical patent/DE19960742B4/en
Publication of DE19960742A1 publication Critical patent/DE19960742A1/en
Application granted granted Critical
Publication of DE19960742B4 publication Critical patent/DE19960742B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—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
    • F01L2013/0068—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 with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

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

Abstract

The valve drive has at least one closure spring (3) supported on the cylinder head (1) and pivot levers (4) indirectly engaged via a pressure roller (5) by cams (6) of a camshaft (7) in the head (1). The pressure roller is associated with a control surface (4a) on the pivot lever and is rotatably mounted in a swinging arm (9) with its pivot axis (10) fixed with respect to the head but is adjustable in position, preferably along the lever.

Description

Die Erfindung betrifft variable Ventiltriebe, vorzugsweise für Verbrennungsmotoren, mit dem im Oberbegriff des Hauptanspruches genannten Aufbau.The invention relates to variable valve trains, preferably for internal combustion engines, with the structure mentioned in the preamble of the main claim.

Generell vorbekannt sind variabler Ventiltriebe mit im Zylinderkopf angeordneten Ventilen, denen jeweils mindestens eine gegen den Zylinderkopf abgestützte Schließfeder zugeordnet ist. Auf den Ventilen stützt sich jeweils ein am Zylinderkopf mittelbar schwenkbar gelagerter Schwenkhebel ab, der mittelbar, unter Zwischen­ schaltung einer Druckrolle, mit einem Nocken einer im Zylinderkopf gelagerten Nockenwelle im Eingriff steht.Variable valve trains with cylinders arranged in the cylinder head are generally known Valves, each of which is supported at least one against the cylinder head Closing spring is assigned. One on each of the valves is supported on the cylinder head indirectly pivoted pivoted lever, the indirect, intermediate switching of a pressure roller, with a cam one in the cylinder head Camshaft is engaged.

Es wird die Aufgabe gelöst, variable Ventiltriebe der genannten Art mit einer geringen Bauraumhöhe zu erzielen, welche nur wenig größer als die von üblichen nicht variablen Ventiltrieben mit Rollenschlepphebeln sind.The problem is solved, variable valve trains of the type mentioned with a low To achieve installation space height, which is only slightly larger than that of the usual variable valve trains with roller rocker arms.

Erfindungsgemäß wird die Aufgabe durch die im kennzeichnenden Teil des Haupt­ anspruches genannten Merkmale gelöst.According to the invention, the task is performed in the characterizing part of the main Claimed features resolved.

Die erfindungsgemäßen variablen Ventiltriebe sind mit geringer Bauhöhe realisierbar und lassen sich hinsichtlich Öffnungshub und -beginn bzw. Hublage zur Kurbelwellenstellung kontinuierlich verstellen. Die Hub-Kraftübertragung erfolgt zwischen den sich relativ zueinander bewegten kinematischen Gliedern in vorteil­ hafter Weise durch Rollen.The variable valve drives according to the invention can be implemented with a low overall height and can be used with regard to opening stroke and start or stroke position Continuously adjust the crankshaft position. The lifting power transmission takes place between the kinematic members moving relative to one another is advantageous by rolling.

Die erfindungsgemäßen Merkmale der Unteransprüche werden in der Beschreibung zusammen mit den durch sie erzielten Vorteilen erläutert.The features of the subclaims according to the invention are described in the description explained together with the advantages achieved by them.

Anhand einer Zeichnung werden nachfolgend Ausführungsbeispiele der Erfindung beschrieben.Exemplary embodiments of the invention are described below with the aid of a drawing described.

Es zeigt:It shows:

Fig. 1 einen schematisierten Schnitt eines erfindungsgemäßen Ventil­ triebes mit einem Stellsegment bei Blick in Richtung der Nocken­ wellenachse, wobei gleichzeitig ein Steuergerät für eine Winkelverstelleinrichtung schematisch dargestellt ist; Fig. 1 shows a schematic section of a valve drive according to the invention with an actuating segment when looking in the direction of the cam shaft axis, wherein a control device for an angle adjustment device is shown schematically at the same time;

Fig. 2 einen schematisierten Schnitt eines erfindungsgemäßen Ventil­ triebes gemäß Fig. 1 in einer Ebene, die längs durch die Nockenwellenachse und die Achse der Druckrolle verläuft; Fig. 2 is a schematic section of a valve drive according to the invention according to Figure 1 in a plane which runs longitudinally through the camshaft axis and the axis of the pressure roller.

Fig. 3 einen schematisierten Schnitt eines erfindungsgemäßen Ventil­ triebes mit einem Stellschieber bei Blick in Richtung der Nocken­ wellenachse. Fig. 3 shows a schematic section of a valve drive according to the invention with a slide valve when looking in the direction of the cam shaft axis.

Die Erfindung betrifft variable Ventiltriebe, vorzugsweise für Verbrennungsmotoren, die folgenden Aufbau aufweisen:
Im Zylinderkopf 1 sind Ventile 2 angeordnet, denen jeweils mindestens eine gegen den Zylinderkopf 1 abgestützte Schließfeder 3 zugeordnet ist.The invention relates to variable valve trains, preferably for internal combustion engines, which have the following structure:
In the cylinder head 1 valves 2 are arranged, to which a supported against the cylinder head 1 closing spring is assigned to at least 3.

Auf den Ventilen 2 stützt sich jeweils ein am Zylinderkopf 1 mittelbar schwenkbar gelagerter Schwenkhebel 4 ab, der mittelbar, unter Zwischenschaltung einer Druck­ rolle 5, mit einem Nocken 6 einer im Zylinderkopf 1 gelagerten Nockenwelle 7 im Eingriff steht.On the valves 2 is supported on the cylinder head 1 indirectly pivotally mounted pivot lever 4 , which, with the interposition of a pressure roller 5 , is in engagement with a cam 6 of a camshaft 7 mounted in the cylinder head 1 .

Der Druckrolle 5 ist am Schwenkhebel 4 eine Stützkurve 4a zugeordnet, auf der sie sich bei Hubbewegungen wälzend und durch die vom Nocken 6 eingeleitete Drehung zusätzlich gleitend abstützt. Die Druckrolle 5 ist von einer Schwinge 9 geführt und in dieser drehbar gelagert. Die Schwenkachse 10 der Schwinge 9 ist zum Zylinderkopf 1 ortsfest, jedoch vorzugsweise in ihrer Lage längs der Erstreckung des Schwenk­ hebels 4 verstellbar, gehalten.The pressure roller 5 is assigned to the pivot lever 4, a support curve 4 a, on which it is rolling during lifting movements and is additionally supported by the rotation initiated by the cam 6 . The pressure roller 5 is guided by a rocker 9 and rotatably supported therein. The pivot axis 10 of the rocker 9 is fixed to the cylinder head 1 , but preferably in its position along the extent of the pivot lever 4 adjustable, held.

Die Stützkurve 4a am Schwenkhebel 4 ist vorteilhaft durch einen Radius R 4a um die Achse A7 der Nockenwelle 7 bestimmt, dessen Größe der Summe der Maße von Grundkreisradius GR 6 des Nockens 6 und dem Durchmesser D5 der Druckrolle 5 entspricht.The support curve 4 a on the pivot lever 4 is advantageously determined by a radius R 4a about the axis A7 of the camshaft 7 , the size of which corresponds to the sum of the dimensions of the base circle radius GR 6 of the cam 6 and the diameter D5 of the pressure roller 5 .

Die Schwenkachse 10 der Schwinge 9 kann auf einer Kreisbahn um die Nocken­ wellenachse in ihrer Lage verstellbar sein, siehe Fig. 1. Die Schwenkachse 10 ist hierzu in einem um die Achse A7 der Nockenwelle durch Schwenken zu ver­ lagerndes Stellsegment 11 gelagert. Dieses ist über eine Verzahnung Z11 mit der Verzahnung Z12 einer Stellwelle 12 gekoppelt, mittels der eine gemeinsame Verstellung von Stellsegmenten 11 bei hintereinander liegenden Ventiltrieben der Zylinder einer Zylinderreihe möglich ist. The pivot axis 10 of the rocker 9 can be adjusted in its position on a circular path around the cam shaft axis, see FIG. 1. For this purpose, the pivot axis 10 is mounted in an actuating segment 11 to be stored about the axis A7 of the camshaft by pivoting. This is coupled via a toothing Z11 to the toothing Z12 of an actuating shaft 12 , by means of which a common adjustment of actuating segments 11 is possible in the case of valve drives of the cylinders of a row of cylinders lying one behind the other.

Ebenso ist es möglich, daß die Schwenkachse 10 durch einen im Zylinderkopf 1 ge­ führten Schieber 16 - siehe Fig. 3 - lageverstellbar ist. Für mehrere Schieber 16 kann, ähnlich wie vorbeschrieben, eine gemeinsame Betätigung vorgesehen werden.It is also possible that the pivot axis 10 by a ge in the cylinder head 1 guided slide 16 - see Fig. 3 - is positionally adjustable. For several sliders 16 , a common actuation can be provided, similar to that described above.

In prinzipiell bekannter Weise ist im Ventiltrieb ein Spielausgleichselement 8 ent­ weder zwischen Ventil 2 und Schwenkhebel 4 oder zwischen dem Lager des Schwenkhebels 4 und dem Zylinderkopf 1 angeordnet.In a manner known in principle, a play compensation element 8 is arranged in the valve train neither between valve 2 and pivot lever 4 or between the bearing of pivot lever 4 and cylinder head 1 .

Werden von einem Nocken 6 zwei Ventile 2 betätigt, so wird die Druckrolle 5 aus drei Druckrollen 5a; 5b; 5c mit einer gemeinsamen Achse 15 gebildet, die von der Schwinge 9 - siehe Fig. 2 - oder einem Schieber 16 - entprechend Fig. 3 - geführt ist. Die mittlere Druckrolle 5 steht mit dem Nocken 6, die beiden äußeren Druckrollen 5 stehen jeweils mit einem Schwenkhebel 4, angreifend an Stützkurve 4a, im Eingriff.If two valves 2 are actuated by a cam 6 , the pressure roller 5 is composed of three pressure rollers 5 a; 5 b; 5 c formed with a common axis 15 which is guided by the rocker 9 - see FIG. 2 - or a slide 16 - corresponding to FIG. 3. The middle pressure roller 5 is with the cam 6 , the two outer pressure rollers 5 are each with a pivot lever 4 , acting on the support curve 4 a, in engagement.

Bei dieser Ausführung wälzt sich die mittlere Druckrolle 5 stetig auf dem Nocken 6 ab, während sich die äußeren Druckrollen bei den Hubbewegungen auf der Stützkurve 4a am Schwenkhebel 4 oszilierend abwälzen. Es tritt in vorteilhafter Weise nur Rollreibung auf.In this embodiment, the middle pressure roller 5 rolls continuously on the cam 6 , while the outer pressure rollers roll on the pivoting lever 4 in an oscillating manner during the lifting movements on the support curve 4 a. Advantageously, only rolling friction occurs.

Eine geteilte Druckrolle 5 mit gemeinsamer Achse 15 läßt sich auch bei Ventiltrieben für nur ein Ventil 2 realisieren.A split pressure roller 5 with a common axis 15 can also be realized with valve drives for only one valve 2 .

Eine 1. Lösung ist mit einem geteilten Nocken 6 mit beidseits des Schwenkhebels 4 erstreckten Nockenhälften bei Anwendung von zwei Druckrollen 5 für die Nocken­ hälften und einer Druckrolle 5 für die Stützkurve 4a möglich.A 1st Solution is possible with a split cam 6 with both sides of the pivot lever 4 extended cam halves when using two pressure rollers 5 for the cams and a pressure roller 5 for the support curve 4 a.

Eine 2. Lösung ist mit einem Schwenkhebel 4 zu realisieren, der beidseits des Nockens 6 Stützkurven 4a aufweist, wobei eine Stützrolle 5a am Nocken 6 anliegt und zwei Stützrollen 5b; 5c sich auf den beidseitigen Stützkurven 4a oszilierend abwälzen. Beide der vorstehend beschriebenen Lösungen sind nicht dargestellt, jedoch aus Fig. 2 in einfacher Weise abzuleiten. A 2nd Solution can be realized with a swivel lever 4 , which has 6 support curves 4 a on both sides of the cam, a support roller 5 a abutting the cam 6 and two support rollers 5 b; 5 c roll on the bilateral support curves 4 a oscillating. Both of the solutions described above are not shown, but can be derived in a simple manner from FIG. 2.

Vorteilhaft ist im Antrieb zwischen Kurbel- und Nockenwelle 7 für den erfindungs­ gemäßen variablen Ventiltrieb eine Winkelverstelleinrichtung 20 angeordnet. Mit ihrer Hilfe kann für jede eingestellte Öffnungscharakteristik des Ventils 2 vorzugsweise der motorisch günstigste Öffnungsbeginn eingestellt werden. Einem Steuergerät 21 für die Winkelverstelleinrichtung 20 liegen für die vorbeschriebene Stellfunktion Signale P10 für dis Position der Schwenkhebelachse 10 und von Motorbetriebsparametern MP, vorzugsweise Last und Drehzahl, an. In Abhängigkeit genannter Größen wird die Winkelverstellung α gesteuert und z. B. der günstigste Öffnungsbeginn des Ventils 2 bei der eingestellten Öffnungscharakteristik gewährleistet.An angle adjustment device 20 is advantageously arranged in the drive between the crankshaft and camshaft 7 for the variable valve train according to the invention. With their help, the motor-favorable opening start can preferably be set for each set opening characteristic of the valve 2 . A control unit 21 for the angle-adjustment means 20 are for the above setting function signals P10 for dis position of the pivot lever shaft 10 and engine operating parameters MP, preferably load and speed, to. Depending on the sizes mentioned, the angle adjustment α is controlled and z. B. the cheapest opening of the valve 2 is guaranteed at the set opening characteristic.

Das Steuergerät 21 für die Winkelverstelleinrichtung 20 ist vorteilhaft mit einem Kennfeld versehen, in dem Winkelverstellwerte α gespeichert und in Abhängigkeit vom Signal P10 der Position der Schwenkhebelachse 10 und von Motorbetriebsparametern MP abrufbar sind.The control unit 21 for the angle adjustment device 20 is advantageously provided with a map in which the angle adjustment values α are stored and can be called up as a function of the signal P10, the position of the pivot lever axis 10 and engine operating parameters MP.

Mit dem erfindungsgemäßen variablen Ventiltrieb lassen sich Öffnungshub, -charakteristik und -beginn bzw. Hublage zur Kurbelwellenstellung kontinuierlich einstellen. With the variable valve train according to the invention, opening stroke, -characteristic and start or stroke position for crankshaft position continuously to adjust.  

BezugszeichenlisteReference list

11

Zylinderkopf
Cylinder head

22nd

Ventil
Valve

33rd

Schließfeder
Closing spring

44th

Schwenkhebel
Swivel lever

44th

a Stützkurve
a support curve

55

Druckrolle
Pressure roller

66

Nocken
cam

77

Nockenwelle
camshaft

88th

Spielausgleichselement
Game compensation element

99

Schwinge
Swingarm

1010th

Schwenkachse
Swivel axis

1111

Stellsegment
Control segment

1212th

Stellwelle
Control shaft

1313

Sensor für die Lage von PP position sensor

1010th

1515

Achse für Axis for

55

a-c
ac

1616

Stellschieber
Gate valve

1717th

Sensor für die Lage von PP position sensor

1010th

2020th

Winkelverstelleinrichtung, verstellt Angle adjustment device, adjusted

77

gegenüber der Kurbelwelle, um ∝
opposite the crankshaft to ∝

2121

Steuergerät
Z11 Verzahnung an Control unit
Z11 gearing on

1111

Z12 Verzahnung an Z12 gearing on

1212th

R4a Radius für R4a radius for

44th

a
D5 Durchmesser von a
D5 diameter of

55

A7 Achse von A7 axis of

77

GR 6 Radius des Grundkreises von GR 6 radius of the base circle of

66

MP Motorbetriebsparameter
P10 Signal PMP engine operating parameters
P10 signal P

1010th

für die Position der Schwenkhebelachse
∝ Verstellwinkel von for the position of the pivot lever axis
∝ adjustment angle of

77

gegenüber der Kurbelwelle (letztere nicht dargestellt)
opposite the crankshaft (the latter not shown)

Claims (12)

1. Variabler Ventiltrieb, vorzugsweise für Verbrennungsmotoren mit folgendem Aufbau:
  • - im Zylinderkopf (1) angeordneten Ventilen (2) ist jeweils mindestens eine gegen den Zylinderkopf (1) abgestützte Schließfeder (3) zugeordnet
  • - auf den Ventilen (2) ist jeweils ein am Zylinderkopf (1) mittelbar schwenkbar gelagerter Schwenkhebel (4) abgestützt, der mittelbar, unter Zwischen­ schaltung einer Druckrolle (5), mit einem Nocken (6) einer im Zylinderkopf (1) gelagerten Nockenwelle (7) im Eingriff steht,
gekennzeichnet durch folgende Merkmale:
  • - der Druckrolle (5) ist am Schwenkhebel (4) eine Stützkurve (4a) zugeordnet
  • - die Druckrolle (5) ist in einer Schwinge (9) drehbar gelagert, wobei deren Schwenkachse (10) zum Zylinderkopf (1) ortsfest, jedoch in seiner Lage, vorzugsweise längs der Erstreckung des Schwenkhebels (4), verstellbar, gehalten ist.
1.Variable valve train, preferably for internal combustion engines with the following structure:
  • - Valves ( 2 ) arranged in the cylinder head ( 1 ) are each assigned at least one closing spring ( 3 ) supported against the cylinder head ( 1 )
  • - On the valves ( 2 ) on the cylinder head ( 1 ) indirectly pivotally mounted pivot lever ( 4 ) is supported, which, with the interposition of a pressure roller ( 5 ), with a cam ( 6 ) a camshaft mounted in the cylinder head ( 1 ) ( 7 ) is engaged,
characterized by the following features:
  • - The pressure roller ( 5 ) on the swivel lever ( 4 ) is assigned a support curve ( 4 a)
  • - The pressure roller ( 5 ) is rotatably mounted in a rocker ( 9 ), the pivot axis ( 10 ) of the cylinder head ( 1 ) being stationary, but in its position, preferably adjustable along the extent of the pivot lever ( 4 ).
2. Variabler Ventiltrieb nach Anspruch 1 dadurch gekennzeichnet, daß die Stützkurve (4a) am Schwenkhebel (4) durch einen Radius um die Nockenwelle (7) bestimmt ist, dessen Größe der Summe von Grundkreisradius (Gk6) des Nockens (6) und dem Durchmesser (D5) der Druckrolle (5) entspricht.2. Variable valve train according to claim 1, characterized in that the support curve ( 4 a) on the pivot lever ( 4 ) is determined by a radius around the camshaft ( 7 ), the size of which is the sum of the base circle radius (Gk6) of the cam ( 6 ) and the Diameter (D5) of the pressure roller ( 5 ) corresponds. 3. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß die Schwenkachse (10) der Schwinge (9) auf einer Kreisbahn um die Nockenwellenachse (A7) in ihrer Lage verstellbar ist.3. Variable valve train according to one or more of the preceding claims, characterized in that the pivot axis ( 10 ) of the rocker ( 9 ) is adjustable in its position on a circular path around the camshaft axis (A7). 4. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß die Schwenkachse (10) durch einen im Zylinderkopf (1) geführten Schieber (16) in seiner Lage verstellbar ist. 4. Variable valve train according to one or more of the preceding claims, characterized in that the pivot axis ( 10 ) is adjustable in position by a slide ( 16 ) guided in the cylinder head ( 1 ). 5. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß ein Spielausgleichselement (8) entweder zwischen Ventil (2) und Schwenk­ hebel (4) oder zwischen Schwenklagerung und Zylinderkopf (1) angeordnet ist.5. Variable valve train according to one or more of the preceding claims, characterized in that a play compensation element ( 8 ) either between the valve ( 2 ) and pivoting lever ( 4 ) or between the pivot bearing and cylinder head ( 1 ) is arranged. 6. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß die Schwenkachse (10) auf einem um die Nockenwellenachse (7A) schwenk­ baren Stellsegment (11) angeordnet ist.6. Variable valve train according to one or more of the preceding claims, characterized in that the pivot axis ( 10 ) is arranged on a pivotable about the camshaft axis ( 7 A) adjusting segment ( 11 ). 7. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß die Druckrolle aus drei Druckrollen (5a; 5b; 5c) mit einer gemeinsamen Achse (15) gebildet ist.7. Variable valve train according to one or more of the preceding claims, characterized in that the pressure roller from three pressure rollers ( 5 a; 5 b; 5 c) is formed with a common axis ( 15 ). 8. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß die mittlere Druckrolle (5a) mit dem Nocken (6) und die beiden äußeren Druckrollen (5b; 5c) jeweils mit einem Schwenkhebel (4) im Eingriff stehen.8. Variable valve train according to one or more of the preceding claims, characterized in that the middle pressure roller ( 5 a) with the cam ( 6 ) and the two outer pressure rollers ( 5 b; 5 c) are each in engagement with a pivot lever ( 4 ) . 9. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß die mittlere Druckrolle (5a) mit einem Schwenkhebel (4) und die beiden äußeren Druckrollen (5b; 5c) mit einem axial geteilten Nocken (6) jeweils im Eingriff stehen.9. Variable valve train according to one or more of the preceding claims, characterized in that the central pressure roller ( 5 a) with a pivot lever ( 4 ) and the two outer pressure rollers ( 5 b; 5 c) with an axially divided cam ( 6 ) each in Stand by. 10. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß im Antrieb zwischen Kurbel- und Nockenwelle (7) eine Winkelverstellein­ richtung (20) angeordnet ist. 10. Variable valve train according to one or more of the preceding claims, characterized in that in the drive between the crankshaft and camshaft ( 7 ) an Winkelverstellein direction ( 20 ) is arranged. 11. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß einem Steuergerät (21) für die Winkelverstelleinrichtung (20) ein Signal (P10) für die Position der Schwenkachse (10) und Signale von Motorbetriebs­ parametern (MP), vorzugsweise Last und Drehzahl, angeschaltet sind und welches in Abhängigkeit der genannten Größen die Winkelverstellung (α) steuert.11. Variable valve train according to one or more of the preceding claims, characterized in that a control device ( 21 ) for the angle adjustment device ( 20 ) has a signal (P10) for the position of the pivot axis ( 10 ) and signals from engine operating parameters (MP), preferably load and speed, are switched on and which controls the angle adjustment (α) depending on the quantities mentioned. 12. Variabler Ventiltrieb nach einem oder mehreren der vorherigen Ansprüche dadurch gekennzeichnet, daß das Steuergerät (21) für die Winkelverstelleinrichtung (20) ein Kennfeld aufweist, in dem Winkelverstellwerte (α) gespeichert, die in Abhängigkeit von der Position der Schwenkachse (10) und von Motorbetriebsparametern (MP) auslesbar sind.12. Variable valve train according to one or more of the preceding claims, characterized in that the control device ( 21 ) for the angle adjustment device ( 20 ) has a map in which the angle adjustment values (α) are stored, which are a function of the position of the pivot axis ( 10 ) and are readable from engine operating parameters (MP).
DE19960742A 1999-12-16 1999-12-16 Variable valve train, preferably for internal combustion engines Expired - Fee Related DE19960742B4 (en)

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GB2412408A (en) * 2004-03-26 2005-09-28 Christopher Paulet Mel Walters Valve gear for an internal combustion engine
FR2872542A1 (en) * 2004-07-05 2006-01-06 Renault Sas Variable actuation device for valve of internal combustion engine, has lever position adjustment units configured for shifting lever angularly around cam axis, where lever transmits movement of cam to valve
EP1619361A1 (en) * 2003-05-01 2006-01-25 Yamaha Hatsudoki Kabushiki Kaisha Valve-moving device for engine
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US6997153B2 (en) 2001-12-29 2006-02-14 Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. Device for variably actuating the gas exchange valves in reciprocating engines
KR100953463B1 (en) * 2001-12-29 2010-04-16 프라운호퍼-게젤샤프트 츄어 푀르더룽 데어 안게반텐 포르슝에.파우. Device for variably actuating the gas exchange valves in reciprocating engines
WO2003058039A1 (en) * 2001-12-29 2003-07-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device for variably actuating the gas exchange valves in reciprocating engines
WO2003071100A1 (en) * 2002-02-16 2003-08-28 Mahle Ventiltrieb Gmbh Control device for a gas exchange valve in an internal combustion engine
US7124721B2 (en) 2002-02-16 2006-10-24 Mahle Ventiltrieb Gmbh Control device for a gas exchange valve in an internal combustion engine
WO2003085239A1 (en) * 2002-04-04 2003-10-16 Thyssenkrupp Automotive Ag Guide systems for variable valve controllers
EP1515008A1 (en) * 2002-05-17 2005-03-16 Yamaha Hatsudoki Kabushiki Kaisha Engine valve driver
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DE10235403A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
DE10306907B4 (en) * 2003-02-17 2004-12-09 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Valve train with variably adjustable stroke for valves of internal combustion engines
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WO2004085804A1 (en) * 2003-03-24 2004-10-07 Thyssenkrupp Automotive Ag Device for the variable actuation of the gas exchange valves of internal combustion engines, and method for operating one such device
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FR2861130A1 (en) * 2003-10-15 2005-04-22 Renault Sa Valve gear drive device for thermal engine, has tilting pawl equipped with central portion on which rotating cam is pressed, and toothed section and worm controlling rotation of arm around axis aligned with driving shaft of cam
GB2412408A (en) * 2004-03-26 2005-09-28 Christopher Paulet Mel Walters Valve gear for an internal combustion engine
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EP1923546A1 (en) * 2005-09-08 2008-05-21 HONDA MOTOR CO., Ltd. Valve drive device for engine
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CN103925034B (en) * 2013-01-15 2016-08-03 长城汽车股份有限公司 A kind of variable valve lift driving device
CN103925031B (en) * 2013-01-15 2016-08-03 长城汽车股份有限公司 A kind of variable valve lift driving device
CN103925032B (en) * 2013-01-15 2016-08-03 长城汽车股份有限公司 A kind of variable valve lift driving device
CN108105393A (en) * 2017-12-05 2018-06-01 浙江联大阀门有限公司 A kind of micro-flow regulating valve
US20210317760A1 (en) * 2018-09-19 2021-10-14 Eaton Intelligent Power Limited Valve train assembly
IT202000012628A1 (en) * 2020-05-28 2021-11-28 Franco Lambertini Sliding system for controlling the continuous lift of the valves of an internal combustion engine, and engine comprising said system.

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