EP0811754A1 - Valve drive for engine or machine, in particular for internal combustion engine - Google Patents

Valve drive for engine or machine, in particular for internal combustion engine Download PDF

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Publication number
EP0811754A1
EP0811754A1 EP97107015A EP97107015A EP0811754A1 EP 0811754 A1 EP0811754 A1 EP 0811754A1 EP 97107015 A EP97107015 A EP 97107015A EP 97107015 A EP97107015 A EP 97107015A EP 0811754 A1 EP0811754 A1 EP 0811754A1
Authority
EP
European Patent Office
Prior art keywords
valve
fork
fork lever
valves
lever
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.)
Withdrawn
Application number
EP97107015A
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German (de)
French (fr)
Inventor
Christian Dovids
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0811754A1 publication Critical patent/EP0811754A1/en
Withdrawn legal-status Critical Current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
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • 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
    • 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
    • F01L1/18—Rocking arms or levers
    • F01L2001/188—Fulcrums at upper surface
    • 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

Definitions

  • the invention is based on the preamble of claim 1 from DE-A 37 43 854.
  • the invention has for its object to improve a generic valve train with a fork lever such that a resonating return spring has no influence on the closing of the respective valve.
  • the invention is characterized in that in each case transversely to the connecting lines seen in plan view of the fork lever from a cam-side point of application to the valve application points of the fork arms, tiltable connecting points are arranged which correspond to separate valve play compensation devices arranged on the machine side at a distance in the direction of the tilting axis.
  • the advantage of the invention is that the fork lever in a resonating valve return spring is held in the correct closed position for both valves by a compensating element spaced apart from the fork arm of the non-oscillating valve, and thus readjustment of the compensating element acting on the fork arm of the oscillating valve is avoided .
  • the closed position is proposed such that the two tiltable connection points are provided on the fork lever transversely outward of the connection lines.
  • the single drawing shows a valve train 1, not shown, for a working machine or an engine, in particular an internal combustion engine, of essentially the same type, and with gas springs 3 equipped with return springs 2, which are stroke-controlled together via a fork lever 4 by a single cam of a control shaft, not shown are.
  • the fork lever 4 comprises - viewed in plan view - substantially parallel fork arms 5, which are connected to a centrally arranged extension 6 stand, which serves to guide a cooperating with the cam of the control shaft, not shown roller 7.
  • a console 9 is provided with a ball socket 10 as a tilting connection point, each with a valve play compensation device symbolically illustrated by the arrows "A".
  • Each of the identical valve lash adjusters arranged on the machine is preferably designed as a hydraulic valve lash adjuster element - HVA -, wherein both compensating elements serve to tilt the fork lever 4 against the machine housing.
  • the tiltable connection points which are preferably designed as ball sockets 10, are each spaced transversely from the two connection lines 11 seen in plan view of the fork lever 4 from a cam-side engagement point 12 of the roller 7 to the valve engagement points 13 of the fork arms 5 of the fork lever 4.
  • the two tiltable movable connection points or ball sockets 10 arranged on the machine side in the direction of the tilt axis 15 are located transversely outwards Connection lines 11 formed on the fork lever 4.
  • a 4-valve cylinder head can be designed with a single control shaft.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The control comprises twin valves operated by forked tappet arms. The two valves (3) are fitted with similar valve springs (2) operated by the two ends (5) of the forked tappet arms (4) pivot mounted between two hydraulic adjusters (9). A single cam follower (7) operates the tappets. The adjusters are on a line (15) nearly at right angles to the lines (11) joining the single cam follower with the pressure points (13) of the tappets on the valves. The adjuster supports are spherical and are spaced sufficiently apart to provide even support in the case of one of the valve gears reaching resonance. This ensures that the adjuster settings remain correct.

Description

Die Erfindung geht gemäß dem Oberbegriff des Patenanspruches 1 von der DE-A 37 43 854 aus.The invention is based on the preamble of claim 1 from DE-A 37 43 854.

Bei diesem bekannten Ventiltrieb sind zwei gleichartige, mit Rückstellfedern ausgerüstete Gaswechselventile über einen gemeinsamen Gabelhebel hubgesteuert, wobei der Gabelhebel zwischen der Steuerwelle und den Gaswechselventilen über ein einziges hydraulisches Ventilspielausgleichselement kippbeweglich abgestützt ist.In this known valve train, two similar gas exchange valves equipped with return springs are stroke-controlled via a common fork lever, the fork lever being supported in a tilting manner between the control shaft and the gas exchange valves via a single hydraulic valve lash compensation element.

Nachteilig bei dieser Anordnung ist, daß bei einer Resonanzschwingung einer der bekanntlich kaum gleich ausführbaren Rückstellfedern das jeweils mitschwingende Ventil für den Gabelhebel gegenüber dem nicht schwingenden Ventil einen nachgiebigen Anschlag bildet und dieses einseitige Absenken des Gabelhebels ein Nachstellen des hydraulischen Ausgleichselementes bewirkt mit der Folge eines nicht mehr schließenden Ventils.The disadvantage of this arrangement is that, in the event of a resonance oscillation of one of the return springs, which is known to be hardly practicable, the respective oscillating valve for the fork lever forms a resilient stop with respect to the non-oscillating valve, and this one-sided lowering of the fork lever causes an adjustment of the hydraulic compensating element, with the consequence of not more closing valve.

Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Ventiltrieb mit einem Gabelhebel derart zu verbessern, daß eine in Resonanz schwingende Rückstellfeder keinen Einfluß auf das Schließen des jeweiligen Ventils hat.The invention has for its object to improve a generic valve train with a fork lever such that a resonating return spring has no influence on the closing of the respective valve.

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst. Die Erfindung ist dadurch gekennzeichnet, daß jeweils querab der in Draufsicht des Gabelhebels gesehenen Verbindungslinien von einem nockenseitigen Angriffspunkt zu den Ventilangriffspunkten der Gabelarme kippbewegliche Verbindungsstellen angeordnet sind, die mit maschinenseitig in Richtung der Kippachse beabstandet angeordneten, gesonderten Ventilspielausgleichs-Einrichtungen korrespondieren.This object is achieved with patent claim 1. The invention is characterized in that in each case transversely to the connecting lines seen in plan view of the fork lever from a cam-side point of application to the valve application points of the fork arms, tiltable connecting points are arranged which correspond to separate valve play compensation devices arranged on the machine side at a distance in the direction of the tilting axis.

Der Vorteil der Erfindung ist, daß der Gabelhebel bei einer in Resonanz schwingenden Ventil-Rückstellfeder durch ein vom Gabelarm des nicht schwingenden Ventils querab beabstandetes Ausgleichselement in korrekter Schließposition für beide Ventile gehalten ist und somit ein Nachstellen des am Gabelarm des schwingenden Ventils wirkenden Ausgleichselementes vermieden ist.The advantage of the invention is that the fork lever in a resonating valve return spring is held in the correct closed position for both valves by a compensating element spaced apart from the fork arm of the non-oscillating valve, and thus readjustment of the compensating element acting on the fork arm of the oscillating valve is avoided .

Um einen relativ großen Hebelarm zu erzielen zwischen dem jeweiligen Ausgleichselement und einer Senkrechten zur Steuerwelle durch den nockenseitigen Angriffspunkt des Gabelhebels zu dessen sicheren Haltung in der o.g. Schließposition wird in Ausgestaltung der Erfindung vorgeschlagen, daß die beiden kippbeweglichen Verbindungsstellen querab auswärts der Verbindungslinien am Gabelhebel vorgesehen sind.In order to achieve a relatively large lever arm between the respective compensating element and a perpendicular to the control shaft through the cam-side point of attack of the fork lever for its secure holding in the above. In the embodiment of the invention, the closed position is proposed such that the two tiltable connection points are provided on the fork lever transversely outward of the connection lines.

Weitere vorteilhafte Ausgestaltungen beschreiben die übrigen Unteransprüche.Further advantageous refinements describe the remaining subclaims.

Die Erfindung ist anhand eines in der Zeichnung dargestellten, bevorzugten Ausführungsbeispiels beschrieben.The invention is described with reference to a preferred embodiment shown in the drawing.

Die einzige Zeichnung zeigt von einem nicht weiter dargestellten Ventiltrieb 1 für eine Arbeits- oder Kraftmaschine, insbesondere Brennkraftmaschine, im wesentlichen parallel angeordnete, gleichartige und mit Rückstellfedern 2 ausgerüstete Gaswechselventile 3, die gemeinsam über einen Gabelhebel 4 von einem einzigen Nocken einer nicht gezeigten Steuerwelle hubgesteuert sind.The single drawing shows a valve train 1, not shown, for a working machine or an engine, in particular an internal combustion engine, of essentially the same type, and with gas springs 3 equipped with return springs 2, which are stroke-controlled together via a fork lever 4 by a single cam of a control shaft, not shown are.

Der Gabelhebel 4 umfaßt - in Draufsicht gesehen - im wesentlichen parallel angeordnete Gabelarme 5, die mit einem mittig angeordneten Fortsatz 6 in Verbindung stehen, der der Führung einer mit dem Nocken der nicht gezeigten Steuerwelle zusammenwirkenden Rolle 7 dient. In den Übergangsecken 8 der Gabelarme 5 in den Fortsatz 6 ist jeweils eine Konsole 9 vorgesehen mit einer Kugelpfanne 10 als kippbewegliche Verbindungsstelle mit jeweils einer durch die Pfeile "A" symbolisch veranschaulichten Ventilspielausgleichs-Einrichtung. Jede der identischen, maschinenseitig angeordneten Ventilspielausgleichs-Einrichtungen ist vorzugsweise als hydraulisches Ventilspielausgleichs-Element - HVA - ausgebildet, wobei beide Ausgleichselemente der kippbeweglichen Abstützung des Gabelhebels 4 gegenüber dem Maschinengehäuse dienen.The fork lever 4 comprises - viewed in plan view - substantially parallel fork arms 5, which are connected to a centrally arranged extension 6 stand, which serves to guide a cooperating with the cam of the control shaft, not shown roller 7. In the transition corners 8 of the fork arms 5 in the extension 6, a console 9 is provided with a ball socket 10 as a tilting connection point, each with a valve play compensation device symbolically illustrated by the arrows "A". Each of the identical valve lash adjusters arranged on the machine is preferably designed as a hydraulic valve lash adjuster element - HVA -, wherein both compensating elements serve to tilt the fork lever 4 against the machine housing.

Wie aus der einzigen Zeichnung ersichtlich, sind die vorzugsweise als Kugelpfannen 10 gestalteten kippbeweglichen Verbindungsstellen jeweils querab der beiden in Draufsicht des Gabelhebels 4 gesehenen Verbindungslinien 11 von einem nockenseitigen Angriffspunkt 12 der Rolle 7 zu den Ventilangriffspunkten 13 der Gabelarme 5 des Gabelhebels 4 beabstandet angeordnet. Zur Erzielung eines relativ großen Hebelarmes zwischen dem jeweiligen in einer der Kugelpfannen 10 eingreifenden Ausgleichselemente "A" und einer Senkrechten 14 zur Steuerwelle durch den nockenseitigen Angriffspunkt 12 sind die beiden maschinenseitig in Richtung der Kippachse 15 beabstandet angeordneten kippbeweglichen Verbindungsstellen bzw. Kugelpfannen 10 querab auswärts der Verbindungslinien 11 am Gabelhebel 4 ausgebildet.As can be seen from the single drawing, the tiltable connection points, which are preferably designed as ball sockets 10, are each spaced transversely from the two connection lines 11 seen in plan view of the fork lever 4 from a cam-side engagement point 12 of the roller 7 to the valve engagement points 13 of the fork arms 5 of the fork lever 4. In order to achieve a relatively large lever arm between the respective compensating elements "A" engaging in one of the ball sockets 10 and a perpendicular 14 to the control shaft through the cam-side engagement point 12, the two tiltable movable connection points or ball sockets 10 arranged on the machine side in the direction of the tilt axis 15 are located transversely outwards Connection lines 11 formed on the fork lever 4.

Mit der erfindungsgemäßen Zuordnung von im gegenseitigen Abstand angeordneten, identischen und der maschinenseitigen kippbeweglichen Abstützung dienenden Ausgleichselementen zu dem Gabelhebel 4 ist sichergestellt, daß dieser bei einem der mit der zugehörigen Rückstellfeder 2 in Resonanz schwingende Ventile 3 durch das am Gabelarm 5 des nicht schwingenden Ventils 3 wirksame Ausgleichselement "A" in einer für beide Ventile 3 gültigen Schließposition in der Gtundkreisphase gehalten ist, so daß beim anderen, dem Gabelarm 5 des schwingenden Ventils 3 zugeordneten Ausgleichselement "A" eine fehlerhafte und für die Ventile 3 schädliche Nachstellung unterbleibt.With the assignment according to the invention of mutually spaced, identical and the machine-side tiltable support serving compensating elements to the fork lever 4 ensures that this with one of the return springs 2 resonating valves 3 by the fork arm 5 of the non-oscillating valve 3 effective compensation element "A" in a valid for both valves 3 closed position in the Gtundkreisphase is held, so that the other, the fork arm 5 of the oscillating valve 3 associated compensation element "A" a faulty and harmful for the valves 3 adjustment does not occur.

Vorteilhaft ist damit ein das Ventilschließen verhinderndes Nachstellen eines hydraulischen Ausgleichselementes vermieden, weiter entfällt auch eine Ölverschäumung. Geringe Reibmomente und eine günstige biegesteife Gestaltung des Gabelhebels 4 ermöglichen weiter vorteilhaft relativ schwache Ventil-Rückstellfedern 2. Schließlich kann ein 4-Ventil-Zylinderkopf mit einer einzigen Steuerwelle ausgebildet sein.This advantageously avoids readjustment of a hydraulic compensating element which prevents valve closing, and there is also no oil foaming. Low friction torques and a favorable rigid design of the fork lever 4 further advantageously enable relatively weak valve return springs 2. Finally, a 4-valve cylinder head can be designed with a single control shaft.

Claims (4)

Ventiltrieb für eine Arbeits- oder Kraftmaschine, insbesondere Brennkraftmaschine, - wobei im wesentlichen parallel angeordnete, gleichartige und mit Rückstellfedern ausgerüstete Gaswechselventile (3) gemeinsam über einen kippbeweglich abgestützten Gabelhebel (4) von einem einzigen Nocken einer Steuerwelle hubbetätigt sind, und - der Gabelhebel (4) mit einer zwischen den Ventilen (3) und der Steuerwelle maschinenseitig angeordneten Ventilspielsausgleichs-Einrichtung (A) in kippbeweglicher Verbindung steht,
dadurch gekennzeichnet, - daß jeweils querab der in Draufsicht des Gabelhebels (4) gesehenen Verbindungslinien (11) von einem nockenseitigen Angriffspunkt (12) zu den Ventilangriffspunkten (13) der Gabelarme (5) kippbewegliche Verbindungsstellen (Kugelpfannen 10) angeordnet sind, die - mit maschinenseitig in Richtung der Kippachse (15) beabstandet angeordneten, gesonderten Ventilspielausgleichs-Einrichtungen (A) korrespondieren. Valve train for a working machine or an engine, in particular an internal combustion engine, - Wherein essentially parallel, similar and equipped with return springs gas exchange valves (3) are stroke-operated by a single cam of a control shaft together via a tiltably supported fork lever (4), and - The fork lever (4) is connected to a valve lash adjuster (A) arranged on the machine side between the valves (3) and the control shaft, and can be tilted,
characterized, - That each transverse to the top view of the fork lever (4) seen connecting lines (11) from a cam-side engagement point (12) to the valve engagement points (13) of the fork arms (5) tilting joints (ball sockets 10) are arranged - Correspond with the separate valve lash adjusters (A) which are spaced apart on the machine side in the direction of the tilt axis (15). Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, daß die beiden kippbeweglichen Verbindungsstellen (Kugelpfannen 10) querab auswärts der Verbindungslinien (11) am Gabelhebel (4) vorgesehen sind.Valve drive according to claim 1, characterized in that the two tilting connecting points (ball sockets 10) are provided on the fork lever (4) transversely outward of the connecting lines (11). Ventiltrieb nach Anspruch 1 und 2, dadurch gekennzeichnet, - daß der Gabelhebel (4) - in Draufsicht gesehen - im wesentlichen parallel angeordnete Gabelarme (5) umfaßt, die - mit einem mittig angeordneten, der Führung einer nockenseitigen Rolle (7) dienenden Fortsatz (6) in Verbindung stehen, wobei - in den Übergangsecken (8) der Gabelarme (5) in den Fortsatz (6) jeweils eine Konsole (9) mit einer Kugelpfanne (10) als kippbewegliche Verbindungsstelle vorgesehen ist. Valve train according to claim 1 and 2, characterized in - That the fork lever (4) - seen in plan view - comprises substantially parallel fork arms (5) which - With a centrally arranged, the guide of a cam-side roller (7) serving extension (6) are connected, wherein - In the transition corners (8) of the fork arms (5) in the extension (6) in each case a console (9) with a ball socket (10) is provided as a tilting connection point. Ventiltrieb nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß hydraulische Ventilspielausgleichs-Elemente (A) der maschinenseitigen, kippbeweglichen Abstützung des Gabelhebels (4) dienen.Valve train according to claims 1 to 3, characterized in that hydraulic valve lash compensation elements (A) serve to support the fork lever (4) on the machine side and can be tilted.
EP97107015A 1996-06-07 1997-04-28 Valve drive for engine or machine, in particular for internal combustion engine Withdrawn EP0811754A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19622770A DE19622770A1 (en) 1996-06-07 1996-06-07 Valve train for a machine or an engine, especially an internal combustion engine
DE19622770 1996-06-07

Publications (1)

Publication Number Publication Date
EP0811754A1 true EP0811754A1 (en) 1997-12-10

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EP97107015A Withdrawn EP0811754A1 (en) 1996-06-07 1997-04-28 Valve drive for engine or machine, in particular for internal combustion engine

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DE (1) DE19622770A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2810368A1 (en) * 2000-06-15 2001-12-21 Renault Rocker arm, for internal combustion engine, has oil canal, to lead pressurised oil from bearing up to external face of rocker arm, into duct, leading to primary contact zone.
FR2815376A1 (en) * 2000-10-13 2002-04-19 Honda Motor Co Ltd Valve control mechanism, for internal combustion engine, has one set of valves controlled directly from camshaft, with other set controlled by stirrup shaped rocker arms.
CN104100316A (en) * 2013-04-09 2014-10-15 Fev有限责任公司 Valve controller for at least two valves
CN111989464A (en) * 2018-03-19 2020-11-24 Fpt发动机研究公司 Variable valve actuation mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801866C2 (en) * 1998-01-20 2002-11-28 Man B & W Diesel Ag Valve control device for an internal combustion engine with at least two inlet and two outlet valves per cylinder head

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR879217A (en) * 1941-02-27 1943-02-17 Maybach Motorenbau Gmbh Rocker arm for simultaneous control of several valves of internal combustion engines
DE3743854A1 (en) * 1987-12-23 1989-07-06 Michael Stirm Four-valve control with upper supporting elements
US4913104A (en) * 1988-11-30 1990-04-03 Henley Manufacturing Corporation Rocker arm for operating two valves

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05272313A (en) * 1992-03-26 1993-10-19 Mitsubishi Motors Corp Rocker arm structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR879217A (en) * 1941-02-27 1943-02-17 Maybach Motorenbau Gmbh Rocker arm for simultaneous control of several valves of internal combustion engines
DE3743854A1 (en) * 1987-12-23 1989-07-06 Michael Stirm Four-valve control with upper supporting elements
US4913104A (en) * 1988-11-30 1990-04-03 Henley Manufacturing Corporation Rocker arm for operating two valves

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2810368A1 (en) * 2000-06-15 2001-12-21 Renault Rocker arm, for internal combustion engine, has oil canal, to lead pressurised oil from bearing up to external face of rocker arm, into duct, leading to primary contact zone.
FR2815376A1 (en) * 2000-10-13 2002-04-19 Honda Motor Co Ltd Valve control mechanism, for internal combustion engine, has one set of valves controlled directly from camshaft, with other set controlled by stirrup shaped rocker arms.
CN104100316A (en) * 2013-04-09 2014-10-15 Fev有限责任公司 Valve controller for at least two valves
CN111989464A (en) * 2018-03-19 2020-11-24 Fpt发动机研究公司 Variable valve actuation mechanism
CN111989464B (en) * 2018-03-19 2022-04-26 Fpt发动机研究公司 Variable valve actuation mechanism

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