EP3164580B1 - Valve train with sliding cam element - Google Patents

Valve train with sliding cam element Download PDF

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Publication number
EP3164580B1
EP3164580B1 EP15732716.4A EP15732716A EP3164580B1 EP 3164580 B1 EP3164580 B1 EP 3164580B1 EP 15732716 A EP15732716 A EP 15732716A EP 3164580 B1 EP3164580 B1 EP 3164580B1
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EP
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Prior art keywords
cam profile
cam
rollers
valve
profile sections
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EP15732716.4A
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German (de)
French (fr)
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EP3164580A1 (en
Inventor
Ulf MÜLLER
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Thyssenkrupp Dynamic Components Teccenter AG
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ThyssenKrupp Presta TecCenter AG
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    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/042—Cam discs
    • 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
    • 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
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L2013/0052—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 with cams provided on an axially slidable sleeve
    • 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 present invention relates to a valve train with a sliding cam element which is axially displaceably received on a support shaft in an axis of rotation of the support shaft and which has at least one cam profile group with mutually differently shaped cam profile sections and a tapping element, via which a control movement tapped from the cam profile sections and a Valve is transferable.
  • the DE 10 2007 010 155 A1 shows a valve train with a sliding cam element arranged on a support shaft and the sliding cam element can be axially displaced in the axis of rotation of the support shaft.
  • a cam profile group is applied, which has different cam profile sections.
  • a tapping element represented as a roller rocker arm, can interact with differently contoured cam profile sections of the cam profile group, so that the valve is actuated in dependence on the selected cam profile section.
  • the cam profile sections may be contoured differently so that the valve can perform different sized or different long opening strokes.
  • the roller rocker arm has a roller, and on the side facing away from the valve, the roller rocker arm is supported via a valve clearance compensation element.
  • the switching times between different cam profile sections extend in operative connection with the tapping element due to a widely-executed displacement element, with the fundamental intention of providing a valve drive in which the cam profile sections can be changed as quickly as possible in contact with the tapping element.
  • the sliding cam element must be moved in very short times axially between at least two positions, so that a narrow-build design of a sliding cam element would be effective.
  • the DE 10 2007 020 128 A1 shows a pick-off element with two rollers which are in contact with a single cam element.
  • the two spaced-apart rollers cause a guide a recording rocker, which rests in a cam follower and allows a tilt compensation of the cam follower relative to the cam member.
  • the object of the invention is the development of a valve train with a sliding cam element, on a support shaft which can be moved in the direction of rotation of the carrier shaft with short switching times between different axial positions.
  • the displacement length should be shortened in the direction of rotation axis, without premature wear of the valve train occurs.
  • the invention includes the technical teaching that at least two mutually identical cam profile groups are formed on the sliding cam element, which cooperate for the common control of a valve with a single tap element.
  • the invention is based on the idea of dividing a required contact width between the cam profile sections of a cam profile group with a tapping element in two individual widths.
  • a twin sliding cam member is formed, and the displacement speed of the sliding cam member in the rotation axis direction is considerably increased due to the shortened path.
  • the switching of the sliding cam element can also take place at higher rotational speeds of the camshaft, since the displacement length of the sliding cam element on the carrier shaft is shortened.
  • the paired cam profile sections need not necessarily have half the width, which has a common cam profile section with a single contact between the cam profile section and a tap element for controlling a valve.
  • An approximate halving is, however, possible because it allows the width of the cam profile group can be approximately halved, while always two individual lines of contact between the Abgriffselement and the sliding cam element on separately arranged cam profile sections are present, so that each transferable with a contact forces per cam profile section are approximately halved.
  • Over the line contact between the cam profile section and the tap element results in a line load, which is approximately equal to a conventional tap by a tap element with a continuous, single contact line.
  • the tapping element may comprise at least two rollers, wherein a first roller cooperates with the cam profile sections of a first cam profile group and wherein a second roller cooperates with the cam profile sections of a second cam profile group.
  • the cam profile groups can be formed adjacent and adjacent to each other on the sliding cam element, so that the sliding cam element does not widen unnecessarily.
  • the rollers on the tapping element can be received in a common roller axis and have a same diameter to each other.
  • the tapping element can be designed as a drag lever, in particular as a roller finger follower, and the two rollers can be mounted parallel to one another on a common axis.
  • the rollers may cooperate with cam profile sections which have a cam contour which is identical to one another, and a gap which is so large that it corresponds at least to the width of a cam profile section or two cam profile sections of a cam profile group may be formed between the rollers on the tapping element. If the cam profile group has, for example, three different cam profile sections, then the gap between the rollers must be at least so wide that two further cam profile sections that are temporarily not in contact with the tapping element can be inserted between the rollers.
  • the cam profile sections may have a common cam base circle section which in particular has a diameter which is the same across the width of the sliding cam element.
  • the sliding cam member may be integrally formed with the two cam profile groups, wherein the two cam profile groups also form a first contact portion with a first tap element, and another pair of cam profile groups may be mounted on the same slide cam element which controls a further valve via a further tap element.
  • valve drive 1 is shown with the features essential to the invention in second side views and in a perspective view.
  • the valve drive 1 has a sliding cam element 10, which is designed in one piece and is received on a support shaft 11 in a rotational axis 12 axially displaceable.
  • the support shaft 11 is shown only in sections, and the sliding cam member 10 may be provided not shown in detail means to move it in the rotation axis direction.
  • cam profile groups 13 On the sliding cam element 10, two mutually identically formed cam profile groups 13 are formed.
  • the cam profile groups 13 point for example, three cam profile sections 14, wherein a cam profile section 14 are designed as Nullhubnocke and two other cam profile sections 14 with different lifting heights.
  • the cam profile sections 14 adjoin one another in the axial direction.
  • a tapping element 15 cooperates, which transmits the lifting information of the cam profile groups 13 to a valve 16.
  • the valve 16 is further shown with a valve spring 21, and on the opposite side of the valve 16 of the Abgriffsiatas 15 is a support member 20 which can serve as a valve clearance compensation element and on which the tapping element 15 is supported.
  • the tapping element 15 is executed in the illustrated embodiment as a roller cam followers with rollers 17 which are received in a common roller axle 18 on the main body of the tapping element 15.
  • the rollers 17 are received at a distance from each other on the tapping element 15 and the distance corresponds to the distance of two equally executed cam profile sections 14 from the respective cam profile groups 13 of the sliding cam element 10. This creates a twin contact between the tapping element 15 and the sliding cam element 10th
  • the cam profile sections 14 of the cam profile groups 13 are designed with a width B which is smaller than a required width of cam profile sections 14 when they form the tap contact for controlling a valve 16 with one of the two rollers 17.
  • the width B of the cam profile sections 14 may be about half as large as a width of cam profile sections that form a single contact with a tapping element 15.
  • the rollers 17 may have a width which is about half as large as a width that would be required if only one roller 17 of a tapping element 15 is in contact with a cam profile section 14 and picks up a lifting movement thereof.
  • the sliding cam member 10 has an overall width substantially equal to a total width of a sliding cam member 10 having conventionally formed cam profile groups 13, the required axial displacement of the sliding cam member 10 in the rotational axis direction is smaller since the cam profile portions 14 are narrower and thus reduced also the way in the direction of rotation axis, by which the sliding cam member 10 must be displaced to make a change of the tap of the rollers 17 between different cam profile sections 14.
  • the actuating forces of the tapping element 15, which are caused by the cam profiles of the cam profile sections 14, are divided into equally formed cam profile sections 14 in contact with the two rollers 17 in equal parts. This creates a line load in the line of contact between the rollers 17 and the cam profile sections 14 which is the same as if only one roller 17 were made wider, and cooperated with a single cam profile section 14 of an individual cam contour. Due to the smaller Axialweg for adjusting the sliding cam member 10, a change of cam profile sections 14 in contact with the roller 17 can be done faster, the change must always be made when the roller 17 is in contact with the Nockengrund Vietnameseabêt 19, on the cam profile groups 13th opposite side of the sliding cam element 10 is present. Thus, the sliding cam member 10 can be adjusted even at higher speeds of the valve train 1, for example, above 4000 1 / min.
  • the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

Description

Die vorliegende Erfindung betrifft einen Ventiltrieb mit einem Schiebenockenelement, das auf einer Trägerwelle in einer Rotationsachse der Trägerwelle axial verschieblich aufgenommen ist und das wenigstens eine Nockenprofilgruppe mit voneinander unterschiedlich ausgebildeten Nockenprofilabschnitten aufweist und mit einem Abgriffselement, über das eine Steuerbewegung von den Nockenprofilabschnitten abgreifbar und auf ein Ventil übertragbar ist.The present invention relates to a valve train with a sliding cam element which is axially displaceably received on a support shaft in an axis of rotation of the support shaft and which has at least one cam profile group with mutually differently shaped cam profile sections and a tapping element, via which a control movement tapped from the cam profile sections and a Valve is transferable.

STAND DER TECHNIKSTATE OF THE ART

Die DE 10 2007 010 155 A1 zeigt einen Ventiltrieb mit einem Schiebenockenelement in Anordnung auf einer Trägerwelle und das Schiebenockenelement kann in der Rotationsachse der Trägerwelle axial verschoben werden. Auf dem Schiebenockenelement ist eine Nockenprofilgruppe aufgebracht, die unterschiedliche Nockenprofilabschnitte aufweist. Abhängig von der Axialposition des Schiebenockenelementes kann ein Abgriffselement, dargestellt als Rollenschlepphebel, mit unterschiedlich konturierten Nockenprofilabschnitten der Nockenprofilgruppe zusammenwirken, sodass das Ventil in Abhängigkeit des gewählten Nockenprofilabschnittes betätigt wird. Beispielsweise können die Nockenprofilabschnitte derart unterschiedlich konturiert sein, dass das Ventil verschieden große oder verschieden lange Öffnungshübe ausführen kann. Der Rollenschlepphebel weist eine Rolle auf, und auf der dem Ventil abgewandten Seite ist der Rollenschlepphebel über ein Ventilspielausgleichselement abgestützt.The DE 10 2007 010 155 A1 shows a valve train with a sliding cam element arranged on a support shaft and the sliding cam element can be axially displaced in the axis of rotation of the support shaft. On the sliding cam element, a cam profile group is applied, which has different cam profile sections. Depending on the axial position of the sliding cam element, a tapping element, represented as a roller rocker arm, can interact with differently contoured cam profile sections of the cam profile group, so that the valve is actuated in dependence on the selected cam profile section. For example, the cam profile sections may be contoured differently so that the valve can perform different sized or different long opening strokes. The roller rocker arm has a roller, and on the side facing away from the valve, the roller rocker arm is supported via a valve clearance compensation element.

Der Kontakt zwischen der Rolle des Rollenschlepphebels und dem Nockenprofilabschnitt erfordert aufgrund der Betätigungskräfte des Ventils eine Mindestbreite, und zwischen der Rolle und dem Nockenprofilabschnitt wird ein Linienkontakt gebildet, der damit eine Mindestlänge aufweisen muss. Wird die Rolle zu schmal gewählt, so werden die Hertzschen Pressungen auf der Oberfläche des Nockenprofilabschnittes zu groß, und es kann zum frühzeitigen Ermüdungs- oder Oberflächenverschleiß des Ventiltriebs kommen. Nachteilhafterweise muss das Schiebenockenelement dadurch mit einer Mindestbreite ausgeführt sein, die wenigstens bestimmt ist durch die erforderliche Breite der Nockenprofilabschnitte, sodass auch eine Mindest-Verschiebelänge des Schiebenockenelementes erforderlich wird, um den Nockenprofilabschnitt in Kontakt mit der Rolle zu wechseln. Durch ein breit ausgeführtes Verschiebeelement verlängern sich jedoch die Schaltzeiten zwischen verschiedenen Nockenprofilabschnitten in Wirkverbindung mit dem Abgriffselement, wobei grundsätzlich die Bestrebung besteht, einen Ventiltrieb zu schaffen, bei dem ein möglichst schneller Wechsel der Nockenprofilabschnitte in Kontakt mit dem Abgriffselement erfolgen kann. Insbesondere bei hohen Drehzahlen einer Brennkraftmaschine muss das Schiebenockenelement in sehr kurzen Zeiten axial zwischen wenigstens zwei Positionen bewegt werden, sodass eine schmal bauende Ausführung eines Schiebenockenelementes zielführend wäre.The contact between the role of Rollenschlepphebels and the cam profile section requires due to the actuation forces of the valve a minimum width, and between the roller and the cam profile section a line contact is formed, which must therefore have a minimum length. Will the If the pulley is too narrow, the Hertzian stresses on the surface of the cam profile section become too large and premature fatigue or surface wear of the valve train can occur. Disadvantageously, the sliding cam element must thereby be designed with a minimum width, which is at least determined by the required width of the cam profile sections, so that a minimum displacement length of the sliding cam element is required to change the cam profile section in contact with the roller. However, the switching times between different cam profile sections extend in operative connection with the tapping element due to a widely-executed displacement element, with the fundamental intention of providing a valve drive in which the cam profile sections can be changed as quickly as possible in contact with the tapping element. In particular, at high speeds of an internal combustion engine, the sliding cam element must be moved in very short times axially between at least two positions, so that a narrow-build design of a sliding cam element would be effective.

Die DE 10 2007 020 128 A1 zeigt ein Abgriffselement mit zwei Rollen, die in Kontakt mit einem einzigen Nockenelement stehen. Die beiden beabstandet zueinander angeordneten Rollen bewirken dabei eine Führung einer Aufnahmewippe, die in einem Nockenfolger einliegt und die einen Kippausgleich des Nockenfolgers gegenüber dem Nockenelement ermöglicht.The DE 10 2007 020 128 A1 shows a pick-off element with two rollers which are in contact with a single cam element. The two spaced-apart rollers cause a guide a recording rocker, which rests in a cam follower and allows a tilt compensation of the cam follower relative to the cam member.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Aufgabe der Erfindung ist die Weiterbildung eines Ventiltriebes mit einem Schiebenockenelement, auf einer Trägerwelle, das in Rotationsachsenrichtung der Trägerwelle mit kurzen Schaltzeiten zwischen verschiedenen Axialpositionen verschoben werden kann. Insbesondere soll die Verschiebelänge in Rotationsachsenrichtung verkürzt werden, ohne dass ein frühzeitiger Verschleiß des Ventiltriebes eintritt.The object of the invention is the development of a valve train with a sliding cam element, on a support shaft which can be moved in the direction of rotation of the carrier shaft with short switching times between different axial positions. In particular, the displacement length should be shortened in the direction of rotation axis, without premature wear of the valve train occurs.

Diese Aufgabe wird ausgehend von einem Ventiltrieb gemäß dem Oberbegriff des Anspruchs 1 in Verbindung mit den kennzeichnenden Merkmalen gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved on the basis of a valve train according to the preamble of claim 1 in conjunction with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.

Die Erfindung schließt die technische Lehre ein, dass am Schiebenockenelement wenigstens zwei zueinander gleiche Nockenprofilgruppen ausgebildet sind, die zur gemeinsamen Steuerung eines Ventils mit einem einzigen Abgriffselement zusammenwirken.The invention includes the technical teaching that at least two mutually identical cam profile groups are formed on the sliding cam element, which cooperate for the common control of a valve with a single tap element.

Die Erfindung geht dabei von dem Gedanken aus, eine erforderlich Kontaktbreite zwischen den Nockenprofilabschnitten einer Nockenprofilgruppe mit einem Abgriffselement in zwei Einzelbreiten aufzuteilen. Dadurch halbiert sich etwa die Breite der einzelnen Nockenprofilabschnitte der Nockenprofilgruppe, wobei der Kontakt zueinander gleicher Nockenprofilabschnitte mit einem einzigen Abgriffselement gleichzeitig erfolgt. Dadurch wird ein Zwillings-Schiebenockenelement gebildet, und die Verstellgeschwindigkeit des Schiebenockenelementes in Rotationsachsenrichtung wird aufgrund des verkürzten Weges erheblich erhöht. Dadurch kann auch die Umschaltung des Schiebenockenelementes auch höheren Drehzahlen der Nockenwelle erfolgen, da die Verschiebelänge des Schiebenockenelementes auf der Trägerwelle verkürzt wird.The invention is based on the idea of dividing a required contact width between the cam profile sections of a cam profile group with a tapping element in two individual widths. As a result, approximately halves the width of the individual cam profile sections of the cam profile group, wherein the contact with each other of the same cam profile sections takes place simultaneously with a single tap element. Thereby, a twin sliding cam member is formed, and the displacement speed of the sliding cam member in the rotation axis direction is considerably increased due to the shortened path. As a result, the switching of the sliding cam element can also take place at higher rotational speeds of the camshaft, since the displacement length of the sliding cam element on the carrier shaft is shortened.

Die paarweise ausgebildeten Nockenprofilabschnitte müssen dabei nicht zwingend die Hälfte der Breite aufweisen, die ein gewöhnlicher Nockenprofilabschnitt mit einem Einzel-Kontakt zwischen dem Nockenprofilabschnitt und einem Abgriffselement zur Steuerung eines Ventiles aufweist. Eine ungefähre Halbierung ist jedoch möglich, da damit die Breite der Nockenprofilgruppe etwa halbiert werden kann, während immer zwei einzelne Kontaktlinien zwischen dem Abgriffselement und dem Schiebenockenelement über getrennt voneinander angeordnete Nockenprofilabschnitte vorliegen, sodass die jeweils mit einem Kontakt übertragbaren Kräfte pro Nockenprofilabschnitt etwa halbiert werden. Über dem Linienkontakt zwischen dem Nockenprofilabschnitt und dem Abgriffselement entsteht dabei eine Linienlast, die etwa gleich ist zu einem konventionellen Abgriff durch ein Abgriffselement mit einer durchgehenden, einzigen Kontaktlinie. Ein weiterer Vorteil ergibt sich durch eine bessere Seitenkippstabilität aufgrund der doppelten Abstützung des Abgriffselementes auf dem Schiebenockenelement.The paired cam profile sections need not necessarily have half the width, which has a common cam profile section with a single contact between the cam profile section and a tap element for controlling a valve. An approximate halving is, however, possible because it allows the width of the cam profile group can be approximately halved, while always two individual lines of contact between the Abgriffselement and the sliding cam element on separately arranged cam profile sections are present, so that each transferable with a contact forces per cam profile section are approximately halved. Over the line contact between the cam profile section and the tap element results in a line load, which is approximately equal to a conventional tap by a tap element with a continuous, single contact line. One Another advantage results from a better Seitenkippstabilität due to the double support of the Abgriffselementes on the sliding cam element.

Gemäß einer vorteilhaften Ausführungsform kann das Abgriffselement wenigstens zwei Rollen aufweisen, wobei eine erste Rolle mit den Nockenprofilabschnitten einer ersten Nockenprofilgruppe zusammenwirkt und wobei eine zweite Rolle mit den Nockenprofilabschnitten einer zweiten Nockenprofilgruppe zusammenwirkt. Die Nockenprofilgruppen können dabei benachbart und angrenzend aneinander am Schiebenockenelement ausgebildet sein, sodass sich das Schiebenockenelement nicht unnötig verbreitert.According to an advantageous embodiment, the tapping element may comprise at least two rollers, wherein a first roller cooperates with the cam profile sections of a first cam profile group and wherein a second roller cooperates with the cam profile sections of a second cam profile group. The cam profile groups can be formed adjacent and adjacent to each other on the sliding cam element, so that the sliding cam element does not widen unnecessarily.

Die Rollen am Abgriffselement können in einer gemeinsamen Rollenachse aufgenommen und einen gleichen Durchmesser zueinander aufweisen. Beispielsweise kann das Abgriffselement als Schlepphebel, insbesondere als Rollen-Schlepphebel ausgeführt sein und die beiden Rollen können parallel zueinander auf einer gemeinsamen Achse gelagert sein.The rollers on the tapping element can be received in a common roller axis and have a same diameter to each other. For example, the tapping element can be designed as a drag lever, in particular as a roller finger follower, and the two rollers can be mounted parallel to one another on a common axis.

Die Rollen können mit Nockenprofilabschnitten zusammenwirken, die eine zueinander gleiche Nockenkontur aufweisen, ferner kann zwischen den Rollen am Abgriffselement ein Zwischenraum ausgebildet sein, der so groß ist, dass dieser wenigstens der Breite eines Nockenprofilabschnittes oder zweier Nockenprofilabschnitte einer Nockenprofilgruppe entspricht. Weist die Nockenprofilgruppe beispielsweise drei unterschiedliche Nockenprofilabschnitte auf, so muss der Zwischenraum zwischen den Rollen zumindest so breit sein, dass zwei weitere vorübergehend nicht in Kontakt mit dem Abgriffselement stehende Nockenprofilabschnitte zwischen den Rollen einliegen können.The rollers may cooperate with cam profile sections which have a cam contour which is identical to one another, and a gap which is so large that it corresponds at least to the width of a cam profile section or two cam profile sections of a cam profile group may be formed between the rollers on the tapping element. If the cam profile group has, for example, three different cam profile sections, then the gap between the rollers must be at least so wide that two further cam profile sections that are temporarily not in contact with the tapping element can be inserted between the rollers.

Die Nockenprofilabschnitte können einen gemeinsamen Nockengrundkreisabschnitt aufweisen, der insbesondere einen über der Breite des Schiebenockenelementes gleichen Durchmesser aufweist. Dadurch kann der Positionswechsel des Schiebenockenelementes in Rotationsachsenrichtung dann erfolgen, wenn das Abgriffselement auf dem Nockengrundkreisabschnitt abläuft, der vorzugsweise durchgehend und damit frei von Absätzen und Durchmessersprüngen ausgebildet ist.The cam profile sections may have a common cam base circle section which in particular has a diameter which is the same across the width of the sliding cam element. As a result, the position change of the sliding cam element in the rotational axis direction can take place when the tapping element runs on the cam base circle section, which is preferably continuous and thus free of shoulders and diameter jumps.

Schließlich kann das Schiebenockenelement mit den zwei Nockenprofilgruppen einstückig ausgeführt sein, wobei die zwei Nockenprofilgruppen auch einen ersten Kontaktabschnitt mit einem ersten Abgriffselement bilden, und ein weiteres Paar an Nockenprofilgruppen kann auf dem gleichen Schiebenockenelement aufgebracht sein, das über ein weiteres Abgriffselement ein weiteres Ventil steuert. Dadurch vergrößert sich der erforderliche axiale Verschiebeweg in Rotationsachsenrichtung des Schiebenockenelementes nicht, da beide Abgriffselemente synchron mit ihrer jeweiligen paarweisen Nockenprofilgruppe zusammenwirken.Finally, the sliding cam member may be integrally formed with the two cam profile groups, wherein the two cam profile groups also form a first contact portion with a first tap element, and another pair of cam profile groups may be mounted on the same slide cam element which controls a further valve via a further tap element. As a result, the required axial displacement in the rotational axis direction of the sliding cam element does not increase since both tapping elements interact synchronously with their respective pairwise cam profile group.

BEVORZUGTES AUSFÜHRUNGSBEISPIEL DER ERFINDUNGPREFERRED EMBODIMENT OF THE INVENTION

Weitere, die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:

Figur 1
eine Seitenansicht eines Ventiltriebes mit den Merkmalen der vorliegenden Erfindung,
Figur 2
eine perspektivische Ansicht des Ventiltriebes gemäß Figur 1 und
Figur 3
eine weitere Seitenansicht des Ventiltriebes gemäß der Figuren 1 und 2.
Further, measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
FIG. 1
a side view of a valve train with the features of the present invention,
FIG. 2
a perspective view of the valve gear according to FIG. 1 and
FIG. 3
another side view of the valve train according to the FIGS. 1 and 2 ,

In den Figuren 1, 2 und 3 ist der Ventiltrieb 1 mit den erfindungswesentlichen Merkmalen in zweiten Seitenansichten und in einer perspektivischen Ansicht gezeigt. Der Ventiltrieb 1 weist ein Schiebenockenelement 10 auf, das einteilig ausgeführt ist und auf einer Trägerwelle 11 in einer Rotationsachse 12 axial verschieblich aufgenommen ist. Die Trägerwelle 11 ist lediglich abschnittsweise gezeigt, und am Schiebenockenelement 10 können nicht näher gezeigte Mittel vorgesehen sein, um dieses in Rotationsachsenrichtung zu verschieben.In the FIGS. 1 . 2 and 3 the valve drive 1 is shown with the features essential to the invention in second side views and in a perspective view. The valve drive 1 has a sliding cam element 10, which is designed in one piece and is received on a support shaft 11 in a rotational axis 12 axially displaceable. The support shaft 11 is shown only in sections, and the sliding cam member 10 may be provided not shown in detail means to move it in the rotation axis direction.

Am Schiebenockenelement 10 sind zwei zueinander gleich ausgebildete Nockenprofilgruppen 13 ausgebildet. Die Nockenprofilgruppen 13 weisen beispielhaft drei Nockenprofilabschnitte 14 auf, wobei ein Nockenprofilabschnitt 14 als Nullhubnocke und zwei weitere Nockenprofilabschnitte 14 mit unterschiedlichen Hubhöhen ausgeführt sind. Die Nockenprofilabschnitte 14 grenzen dabei in Axialrichtung aneinander an.On the sliding cam element 10, two mutually identically formed cam profile groups 13 are formed. The cam profile groups 13 point for example, three cam profile sections 14, wherein a cam profile section 14 are designed as Nullhubnocke and two other cam profile sections 14 with different lifting heights. The cam profile sections 14 adjoin one another in the axial direction.

Mit den Nockenprofilgruppen 13 wirkt ein Abgriffselement 15 zusammen, das die Hubinformation der Nockenprofilgruppen 13 auf ein Ventil 16 überträgt. Das Ventil 16 ist ferner mit einer Ventilfeder 21 gezeigt, und auf der dem Ventil 16 gegenüberliegenden Seite des Abgriffselementes 15 befindet sich ein Stützelement 20, das als Ventilspielausgleichselement dienen kann und auf dem das Abgriffselement 15 abgestützt ist.With the cam profile groups 13 a tapping element 15 cooperates, which transmits the lifting information of the cam profile groups 13 to a valve 16. The valve 16 is further shown with a valve spring 21, and on the opposite side of the valve 16 of the Abgriffselementes 15 is a support member 20 which can serve as a valve clearance compensation element and on which the tapping element 15 is supported.

Das Abgriffselement 15 ist im gezeigten Ausführungsbeispiel als Rollenschlepphebel mit Rollen 17 ausgeführt, die in einer gemeinsamen Rollenachse 18 am Grundkörper des Abgriffselementes 15 aufgenommen sind. Die Rollen 17 sind mit einem Abstand zueinander am Abgriffselement 15 aufgenommen und der Abstand entspricht dabei dem Abstand von zwei gleich ausgeführten Nockenprofilabschnitten 14 aus den jeweiligen Nockenprofilgruppen 13 des Schiebenockenelementes 10. Damit entsteht ein Zwillingskontakt zwischen dem Abgriffselement 15 und dem Schiebenockenelement 10.The tapping element 15 is executed in the illustrated embodiment as a roller cam followers with rollers 17 which are received in a common roller axle 18 on the main body of the tapping element 15. The rollers 17 are received at a distance from each other on the tapping element 15 and the distance corresponds to the distance of two equally executed cam profile sections 14 from the respective cam profile groups 13 of the sliding cam element 10. This creates a twin contact between the tapping element 15 and the sliding cam element 10th

Die Nockenprofilabschnitte 14 der Nockenprofilgruppen 13 sind mit einer Breite B ausgeführt, die kleiner ist als eine erforderliche Breite von Nockenprofilabschnitten 14, wenn diese mit einer der beiden Rollen 17 den Abgriffskontakt zur Steuerung eines Ventils 16 bilden. Beispielsweise kann die Breite B der Nockenprofilabschnitte 14 etwa halb so groß sein wie eine Breite von Nockenprofilabschnitten, die einen Einzelkontakt mit einem Abgriffselement 15 bilden. Auch die Rollen 17 können eine Breite aufweisen, die etwa halb so groß ist, wie eine Breite, die erforderlich wäre, wenn nur eine Rolle 17 eines Abgriffselementes 15 in Kontakt mit einem Nockenprofilabschnitt 14 ist und eine Hubbewegung von diesem abgreift.The cam profile sections 14 of the cam profile groups 13 are designed with a width B which is smaller than a required width of cam profile sections 14 when they form the tap contact for controlling a valve 16 with one of the two rollers 17. For example, the width B of the cam profile sections 14 may be about half as large as a width of cam profile sections that form a single contact with a tapping element 15. Also, the rollers 17 may have a width which is about half as large as a width that would be required if only one roller 17 of a tapping element 15 is in contact with a cam profile section 14 and picks up a lifting movement thereof.

Zwar weist das Schiebenockenelement 10 eine Gesamtbreite auf, die im Wesentlichen genauso groß ist, wie eine Gesamtbreite eines Schiebenockenelementes 10 mit konventionell ausgebildeten Nockenprofilgruppen 13, jedoch fällt die erforderliche Axialverlagerung des Schiebenockenelementes 10 in Rotationsachsenrichtung kleiner aus, da die Nockenprofilabschnitte 14 schmaler sind und damit verringert sich auch der Weg in Rotationsachsenrichtung, um den das Schiebenockenelement 10 verlagert werden muss, um einen Wechsel des Abgriffs der Rollen 17 zwischen verschiedenen Nockenprofilabschnitten 14 vorzunehmen.Although the sliding cam member 10 has an overall width substantially equal to a total width of a sliding cam member 10 having conventionally formed cam profile groups 13, the required axial displacement of the sliding cam member 10 in the rotational axis direction is smaller since the cam profile portions 14 are narrower and thus reduced also the way in the direction of rotation axis, by which the sliding cam member 10 must be displaced to make a change of the tap of the rollers 17 between different cam profile sections 14.

Die Betätigungskräfte des Abgriffelementes 15, die durch die Nockenprofile der Nockenprofilabschnitte 14 hervorgerufen werden, werden auf zueinander gleich ausgebildete Nockenprofilabschnitte 14 in Kontakt mit den beiden Rollen 17 zu gleichen Teilen aufgeteilt. Dadurch entsteht eine Linienlast in der Kontaktlinie zwischen den Rollen 17 und den Nockenprofilabschnitten 14, die genauso groß ist, als würde nur eine Rolle 17 breiter ausgeführt werden, und mit einem einzigen Nockenprofilabschnitt 14 einer individuellen Nockenkontur zusammenwirken. Durch den kleineren Axialweg zur Verstellung des Schiebenockenelementes 10 kann ein Wechsel von Nockenprofilabschnitten 14 in Kontakt mit der Rolle 17 schneller erfolgen, wobei der Wechsel immer dann erfolgen muss, wenn die Rolle 17 mit dem Nockengrundkreisabschnitt 19 in Kontakt steht, der auf der den Nockenprofilgruppen 13 gegenüberliegenden Seite des Schiebenockenelementes 10 vorhanden ist. Somit kann das Schiebenockenelement 10 auch bei höheren Drehzahlen des Ventiltriebes 1 verstellt werden, beispielsweise oberhalb von 4000 1/min.The actuating forces of the tapping element 15, which are caused by the cam profiles of the cam profile sections 14, are divided into equally formed cam profile sections 14 in contact with the two rollers 17 in equal parts. This creates a line load in the line of contact between the rollers 17 and the cam profile sections 14 which is the same as if only one roller 17 were made wider, and cooperated with a single cam profile section 14 of an individual cam contour. Due to the smaller Axialweg for adjusting the sliding cam member 10, a change of cam profile sections 14 in contact with the roller 17 can be done faster, the change must always be made when the roller 17 is in contact with the Nockengrundkreisabschnitt 19, on the cam profile groups 13th opposite side of the sliding cam element 10 is present. Thus, the sliding cam member 10 can be adjusted even at higher speeds of the valve train 1, for example, above 4000 1 / min.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbeispiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht.The invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Ventiltriebvalve train
1010
SchiebenockenelementSliding cam element
1111
Trägerwellecarrier wave
1212
Rotationsachseaxis of rotation
1313
NockenprofilgruppeCam profile group
1414
NockenprofilabschnittCam profile section
1515
Abgriffselementtapping element
1616
VentilValve
1717
Rollerole
1818
Rollenachseroller axis
1919
NockengrundkreisabschnittCam base circle portion
2020
Stützelementsupport element
2121
Ventilfedervalve spring
BB
Breitewidth

Claims (8)

  1. Valve drive (1) having a sliding cam element (10) which is held on a carrier shaft (11) so as to be axially displaceable in an axis of rotation (12) of the carrier shaft (11) and which has at least one cam profile group (13) with cam profile sections (14) of mutually different form, and having a pick-off element (15) by way of which a control movement can be picked off from the cam profile sections (14) and transmitted to a valve (16),
    wherein at least two cam profile groups (13) which are mutually identical and which, for the joint control of one valve (16), interact with a single pick-off element (15) are formed adjacent to one another, and so as to adjoin one another, on the sliding cam element (10), wherein the pick-off element (15) has at least two rollers (17), wherein a first roller (17) interacts with the cam profile sections (14) of a first cam profile group (13), and wherein a second roller (17) interacts with the cam profile sections (14) of a second cam profile group (13).
  2. Valve drive (1) according to Claim 1, characterized in that the rollers (17) on the pick-off element (15) are held in a common roller axis (18).
  3. Valve drive (1) according to either of the preceding claims, characterized in that the rollers (17) have a mutually identical diameter.
  4. Valve drive (1) according to one of the preceding claims, characterized in that the rollers (17) interact with cam profile sections (14) which have mutually identical cam contours.
  5. Valve drive (1) according to one of the preceding claims, characterized in that, on the pick-off element (15), between the rollers (17), there is formed an intermediate space which is of such a size that it corresponds at least to the width (B) of a cam profile section (14) or of two cam profile sections (14) of a cam profile group (13) .
  6. Valve drive (1) according to one of the preceding claims, characterized in that the cam profile sections (14) have a common cam base circle section (19) which has, in particular, a diameter which is constant over the width of the sliding cam element (10).
  7. Valve drive (1) according to one of the preceding claims, characterized in that the pick-off element (15) is in the form of a rocker lever.
  8. Valve drive (1) according to one of the preceding claims, characterized in that the sliding cam element (10) is formed in one piece with the two cam profile groups (13).
EP15732716.4A 2014-07-02 2015-07-01 Valve train with sliding cam element Active EP3164580B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014109243.0A DE102014109243B3 (en) 2014-07-02 2014-07-02 Valve drive with a sliding cam element
PCT/EP2015/064930 WO2016001274A1 (en) 2014-07-02 2015-07-01 Valve train having a sliding cam element

Publications (2)

Publication Number Publication Date
EP3164580A1 EP3164580A1 (en) 2017-05-10
EP3164580B1 true EP3164580B1 (en) 2018-09-12

Family

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EP15732716.4A Active EP3164580B1 (en) 2014-07-02 2015-07-01 Valve train with sliding cam element

Country Status (5)

Country Link
US (1) US10711664B2 (en)
EP (1) EP3164580B1 (en)
CN (1) CN106471223B (en)
DE (1) DE102014109243B3 (en)
WO (1) WO2016001274A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016204892A1 (en) * 2016-03-23 2017-09-28 Mahle International Gmbh Valve train for an internal combustion engine
DE102016204889A1 (en) 2016-03-23 2017-09-28 Mahle International Gmbh Valve train for an internal combustion engine
DE102018123030A1 (en) * 2018-09-19 2020-03-19 Thyssenkrupp Ag Sliding cam element, valve train, internal combustion engine, use and method for controlling valves

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Publication number Priority date Publication date Assignee Title
DE2753197A1 (en) * 1976-12-15 1978-06-22 Eaton Corp VALVE CONTROL DEVICE
US4516542A (en) * 1982-06-02 1985-05-14 Nissan Motor Co., Ltd. Valve operation changing system of internal combustion engine
DE4142197A1 (en) * 1991-12-20 1993-04-08 Daimler Benz Ag Rocker for valve drive - has cylindrical lock to connect independently movable rocker arms
DE102006058093A1 (en) * 2006-12-09 2008-06-12 Schaeffler Kg valve train
DE102007010155A1 (en) * 2007-03-02 2008-09-04 Audi Ag Camshaft for IC engine has two cam followers plus a circular cam which slides axially into the cam bearing for the non operating valve setting
DE102007020128A1 (en) * 2007-04-28 2008-10-30 Schaeffler Kg Cylinder valve cam drive, for an internal combustion motor, has a release mounting between the supports and the cam follower to equalize tolerances automatically on installation
DE102010005790B4 (en) * 2010-01-25 2012-03-15 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Valve gear for actuating gas exchange valves of internal combustion engines
DE102010011828A1 (en) * 2010-03-18 2011-09-22 Schaeffler Technologies Gmbh & Co. Kg Switchable lever for a valve train of an internal combustion engine
DE102012103751B4 (en) * 2012-04-27 2023-06-15 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Internal combustion engine and valve train for an internal combustion engine

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
US20170138231A1 (en) 2017-05-18
EP3164580A1 (en) 2017-05-10
US10711664B2 (en) 2020-07-14
WO2016001274A1 (en) 2016-01-07
CN106471223A (en) 2017-03-01
CN106471223B (en) 2020-03-24
DE102014109243B3 (en) 2015-11-12

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