EP3167168A1 - Mechanically controllable valve drive - Google Patents

Mechanically controllable valve drive

Info

Publication number
EP3167168A1
EP3167168A1 EP15718934.1A EP15718934A EP3167168A1 EP 3167168 A1 EP3167168 A1 EP 3167168A1 EP 15718934 A EP15718934 A EP 15718934A EP 3167168 A1 EP3167168 A1 EP 3167168A1
Authority
EP
European Patent Office
Prior art keywords
intermediate lever
roller member
arrangement
mechanically controllable
valve drive
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
EP15718934.1A
Other languages
German (de)
French (fr)
Other versions
EP3167168B1 (en
Inventor
Michael Breuer
Karsten Grimm
Stephan Schmitt
Sabine Siebrandt
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP3167168A1 publication Critical patent/EP3167168A1/en
Application granted granted Critical
Publication of EP3167168B1 publication Critical patent/EP3167168B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—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
    • 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
    • F01L1/047—Camshafts
    • 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
    • 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
    • F01L13/0063—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

Definitions

  • the invention relates to a mechanically controllable valve train with a gas exchange valve, wherein the gas exchange valve is assigned a transmission arrangement, wherein the transmission arrangement comprises an intermediate lever arrangement and a finger lever arrangement, wherein an intermediate lever of the intermediate lever arrangement a working curve for operative connection with a towing lift! the drag lever assembly, wherein the intermediate lever comprises a first roller member, which is in operative connection with a circumferential contour of a camshaft and wherein the intermediate lever comprises a second roller member which is rotatably mounted on an axis, such that the second roller member is in operative connection with a VentilhubverstellISS in that different valve lift positions are adjustable, spring means being provided which act on the intermediate lever arrangement and wherein guide means are provided for the intermediate lever arrangement.
  • the object of the invention is therefore to provide a mechanically controllable valve train, which avoids the disadvantages mentioned above.
  • the guide means consist of a link on which acts at least one guide roller member which is provided in the region of the second roller member.
  • the guide roller member is the second roller member.
  • a common stationary contact roller is provided for guidance in the slide and for operative connection with the valve lift, whereby a significantly lower component complexity and design effort is made possible.
  • a reduced friction by integrally lower Rolling paths under load instead.
  • the moving hatch of the intermediate lever assembly is reduced in this way.
  • at least one separate guide roller member is mounted on the axis of the second roller member.
  • the axis of the second Rolienorgans is rigidly connected to the intermediate lever.
  • an active contour of the backdrop is formed as a circular path around the center of a third roller member of the Schiepphe els in Grund Vietnameseaniage the camshaft.
  • the Arbeltskurve the intermediate lever consists essentially of two sub-areas, a first portion which is formed as a circular path around the center of the axis of the second roller member and a second portion which is formed as a continuous elevation curve.
  • the spring means consist of a torsion spring member which rests with a first end against a cylinder housing part and acts with a second end on an abutment which is rigidly connected to the intermediate lever, such that a force is introduced into the intermediate lever, both pushes the guide roller to the backdrop, as well as the first roller presses on the camshaft.
  • FIGURE shows a schematic side view of a mechanically controllable valve drive according to the invention.
  • FIG. 1 shows a mechanically controllable valvetrain 2 according to the invention for an indicated gas exchange valve 4 with a transfer arrangement 5, which in the present embodiment has an intermediate lever arrangement 6 and a cam follower arrangement 8. Furthermore, a VentilhubverstellISSISS 10 in the form of a having a peripheral contour 9, which has a relation to a base circle 11 recessed eccentric region provided, which is driven by an actuator, not shown.
  • the intermediate lever assembly 6 has an intermediate lever 12, which has a first roller member 14, which is in operative connection with a peripheral contour 16 of a camshaft 18. Furthermore, the intermediate lever 12 has a second roller member 20, which is rotatably mounted on an axis 22 and is in operative connection with the valve lift adjusting device 10, so that in a known manner different valve lift positions of the gas exchange valve 4 are adjustable.
  • the intermediate lever 12 has a working curve 24, which is in known manner with a third roller member 26 of a drag lever 28 of the finger lever assembly 8 in operative connection.
  • the working curve 24 of the intermediate lever 12 in this case has essentially two partial areas 30, 32.
  • the first portion 30 is hereby formed as a circular path around the center of the axis 22 of the second roller member 20 as shown.
  • the second portion 32 is formed as a continuous elevation curve.
  • the second roller member 20 is formed in addition to its function as an attack surface for the Ventilhubverstell noticed 10 as a guide roller member, which serves as a guide means 36 for the intermediate lever 12 together with a link 34.
  • the guide means 36 may also be formed as separate guide roller members, such that then at least one guide roller member is arranged on the axis 22 adjacent to the second roller member 20, which on the slide 34th attacks.
  • the axis 22 is rigidly connected in the present embodiment with the intermediate lever 12, so that it is designed very torsionally rigid.
  • An action contour 38 of the guide 32 is formed n of the base circle of the peripheral contour 16 of the camshaft 18 as a circular path about the center of the third roller member 26 of the finger lever 28 of the finger lever assembly 8.
  • a torsion spring member 40 is provided which is mounted with a first end 42 in a cylinder housing part 43 and engages with a second end 44 on an abutment 46 which is rigidly connected to the intermediate lever 12. In this way, a force is introduced into the intermediate lever 12, which presses both the guide roller member 20 to the link 34 and the Ventilhubverstellelnuze 10, as well as the first roller 14 to the camshaft 18 presses.
  • Figure 1 shows the gas exchange valve 4 in a closed position, d. That is, the valve lift adjusting device 10 rests with its eccentric region of the circumferential contour 9 against the second roller member 20. The camshaft 18 abuts with the base circle 19 of the peripheral contour 16 on the first roller member 14, resulting in that the valve is closed.
  • FIG. 2 now shows the mechanically controllable valve drive 2 from FIG. 1 with the camshaft 18 rotated through 180 °, so that the eccentric region of the circumferential contour 16 rests in the maximum position on the first roller member 14. Due to the unchanged position of the Ventilhubverstell issued 10 the gas exchange valve 4 remains but still closed. Only the region of the portion 30 of the working contour 24 has shifted relative to the third roller member 26.
  • FIG. 3 now shows the valve drive 2, in which the valve lift adjusting device 10 is connected to the base circle 11 of the peripheral contour 9 abuts the second Rol! Enorgan 20 and consequently the roller member 20 deflects a maximum to the right.
  • the camshaft 18 rests here only with the base circle 19 on the first roller member 14, the gas exchange valve is closed in this position.
  • FIG. 4 now shows the maximum stroke of the gas exchange valve 4, the valve lift stiffening device 10 abutting the base circle 11 of the peripheral contour 9 on the second roller element 20 and the camshaft 18 abutting the eccentric region 16 on the first roller element 14.
  • the working contour 24 now comes with the outermost portion 32 in contact with the third Rolienorgan 26 and causes in this way the maximum stroke of the gas exchange valve. 4

Landscapes

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

Abstract

The invention relates to a mechanically controllable valve drive comprising a gas exchange valve (4). A transfer arrangement (5) is paired with the gas exchange valve (4), and the transfer arrangement (5) has an intermediate lever arrangement (6) and a drag lever arrangement (8). An intermediate lever (12) of the intermediate lever arrangement (6) has a working curve (24) for an operative connection to a drag lever (28) of the drag lever arrangement (8). The intermediate lever (12) has a first rolling element (14) which is operatively connected to a circumferential contour (16) of a camshaft (18), and the intermediate lever (12) has a second rolling element (20) which is rotatably mounted on an axle (22) such that the second rolling element (20) is operatively connected to a valve stroke adjusting device (10) such that different valve stroke positions can be set. Spring means are provided which engage onto the intermediate lever arrangement (6), and guiding means are provided for the intermediate lever arrangement. The guiding means (36) consist of a slotted guide (34) onto which at least one guide rolling element engages that is provided in the region of the second rolling element (20).

Description

B E S C H R E I B U N G Mechanisch steuerbarer Ventiltrieb  B E S C H R E I N U S G Mechanically controllable valve train
Die Erfindung betrifft einen mechanisch steuerbarer Ventiltrieb mit einem Gaswechselventil, wobei dem Gaswechselventil eine Übertragungsanordnung zugeordnet ist, wobei die Übertragungsanordnung eine Zwischenhebelanordnung und eine Schlepphebelanordnung aufweist, wobei ein Zwischenhebel der Zwischenhebelanordnung eine Arbeitskurve zur Wirkverbindung mit einem Schlepphebe! der Schlepphebelanordnung aufweist, wobei der Zwischenhebel ein erstes Rollenorgan aufweist, das in Wirkverbindung mit einer Umfangskontur einer Nockenwelle steht und wobei der Zwischenhebel ein zweites Rollenorgan aufweist, das auf einer Achse drehbar gelagert ist, derart, dass das zweite Rollenorgan mit einer Ventilhubverstelleinrichtung in Wirkverbindung steht, derart, dass verschiedene Ventilhubpositionen einstellbar sind, wobei Federmittel vorgesehen sind, die auf die Zwischenhebelanordnung angreifen und wobei Führungsmittel für die Zwischenhebelanordnung vorgesehen sind. The invention relates to a mechanically controllable valve train with a gas exchange valve, wherein the gas exchange valve is assigned a transmission arrangement, wherein the transmission arrangement comprises an intermediate lever arrangement and a finger lever arrangement, wherein an intermediate lever of the intermediate lever arrangement a working curve for operative connection with a towing lift! the drag lever assembly, wherein the intermediate lever comprises a first roller member, which is in operative connection with a circumferential contour of a camshaft and wherein the intermediate lever comprises a second roller member which is rotatably mounted on an axis, such that the second roller member is in operative connection with a Ventilhubverstelleinrichtung in that different valve lift positions are adjustable, spring means being provided which act on the intermediate lever arrangement and wherein guide means are provided for the intermediate lever arrangement.
Derartige mechanisch steuerbare Ventiltriebe sind hinlänglich bekannt. So offenbart beispielsweise die DE 10 2012 006 982 AI einen mechanisch steuerbaren Ventiltrieb, bei dem im Bereich des ersten Roilenorgans, das mit der Nockenwelle zusammenwirkt, mindestens ein weiteres Rollenorgan vorgesehen ist, das eine Führung des Zwischenhebels in einer Kulisse bewirkt. Hierdurch erfolgt jedoch lediglich eine indirekte Kraftableitung der Gaswechselventilkräfte in Ventilachsrichtung, was zu Deformationen und Steifigkeitsverlusten der Achse führen kann, auf der das erste Rollenorgan und das Führungsrollenorgan gelagert sind. Zudem bedingt die direkte Nachbarschaft von dem sich schnell bewegenden Führungsrollenorgan und dem ersten Roüenorgan einen großen kinematischen Nachteil hinsichtlich Reibung und Schmierung, da das erste Rollenorgan wesentlich schneller dreht als das Führungsrollenorgan. Auch ist eine separate Übertragungsanordnung für ein einzelnes Gaswechselventil lediglich mit hohem konstruktiven Aufwand möglich. Darüber hinaus Ist aus der DE 103 20 324 AI ein gattungsgemäßer Ventiltrieb bekannt, bei dem eine Gleitstütze als Führungsmitte! vorgesehen ist, die sich an der Ventilhubverste!leinrichtung abstützt. Auch diese Ausführungsform weist insbesondere Nachtelle hinsichtlich der Reibung und dem Verschleiß der Ventilhubverstelleinrichtung auf. Auch ist diese Ausführungsform kompliziert im konstruktiven Aufbau. Such mechanically controllable valve trains are well known. For example, DE 10 2012 006 982 AI discloses a mechanically controllable valve drive, wherein at least one further roller member is provided in the region of the first Roilenorgans, which cooperates with the camshaft, which causes a guide of the intermediate lever in a backdrop. As a result, however, there is only an indirect force derivative of the gas exchange valve forces in Ventilachsrichtung, which can lead to deformation and stiffness losses of the axis on which the first roller member and the guide roller member are mounted. In addition, due to the direct vicinity of the fast-moving guide roller member and the first Roüenorgan a large kinematic disadvantage in terms of friction and lubrication, since the first roller member rotates much faster than the guide roller member. Also, a separate transmission arrangement for a single gas exchange valve is possible only with great design effort. In addition, from DE 103 20 324 AI a generic valve train is known in which a sliding support as a guide center! is provided, which is supported on the Ventilhubverste! leinrichtung. This embodiment also has particular disadvantages with respect to the friction and the wear of the valve lift adjusting device. Also, this embodiment is complicated in construction.
Aufgabe der Erfindung ist es daher, einen mechanisch steuerbaren Ventiltrieb bereitzustellen, der die oben genannten Nachteile vermeidet. The object of the invention is therefore to provide a mechanically controllable valve train, which avoids the disadvantages mentioned above.
Diese Aufgabe wird dadurch gelöst, dass die Führungsmittel aus einer Kulisse bestehen, auf die mindestens ein Führungsrollenorgan, das im Bereich des zweiten Rollenorgans vorgesehen ist, angreift. Hierdurch ist eine direkte Ableitung der hohen Ventilkräfte in die Kulisse möglich, wodurch der Zwischenhebel wesentlich geringer belastet wird. Hierdurch kann wiederum der Zwischenhebel kompakter und leichter gestaltet werden. Durch eine derartige Anordnung wird zudem auch die Phasenlage der Ventilöffnung relativ zum Nocken- und damit zum Kurbelwinkel verändert. Dadurch kann ein Nockenwellensteller für die Nockenwelle mit verringertem Stellbereich eingesetzt werden. This object is achieved in that the guide means consist of a link on which acts at least one guide roller member which is provided in the region of the second roller member. As a result, a direct derivation of the high valve forces in the scenery is possible, whereby the intermediate lever is loaded much less. As a result, in turn, the intermediate lever can be made more compact and lighter. By such an arrangement also the phase position of the valve opening is also changed relative to the cam and thus the crank angle. As a result, a camshaft adjuster for the camshaft can be used with a reduced setting range.
In einer vorteilhaften Ausführungsform ist das Führungsrollenorgan das zweite Rollenorgan. Hierdurch wird eine gemeinsame stillstehende Kontaktrolle zur Führung in der Kulisse und zur Wirkverbindung mit der Ventilhubverstelleinrichtung bereitgestellt, wodurch ein wesentlich geringerer Bauteileaufwand und konstruktiver Aufwand ermöglicht wird. Zudem findet eine verminderte Reibung durch integral geringere Abrollwege unter Last statt. Gleichzeitig wird auf diese Art und Weise die bewegte Hasse der Zwischenhebelanordnung verringert. Es ist jedoch auch möglich, dass mindestens ein separates Führungsrollenorgan auf der Achse des zweiten Rollenorgans gelagert ist. In an advantageous embodiment, the guide roller member is the second roller member. As a result, a common stationary contact roller is provided for guidance in the slide and for operative connection with the valve lift, whereby a significantly lower component complexity and design effort is made possible. In addition, a reduced friction by integrally lower Rolling paths under load instead. At the same time the moving hatch of the intermediate lever assembly is reduced in this way. However, it is also possible that at least one separate guide roller member is mounted on the axis of the second roller member.
In vorteilhafter Weise ist die Achse des zweiten Rolienorgans starr mit dem Zwischenhebel verbunden. In einer vorteilhaften Ausführungsform ist eine Wirkkontur der Kulisse als Kreisbahn um den Mittelpunkt eines dritten Rollenorgans des Schiepphe els in Grundkreisaniage der Nockenwelle ausgebildet. Auch ist es vorteilhaft, wenn die Arbeltskurve des Zwischenhebels im Wesentlichen aus zwei Teilbereichen besteht, einem ersten Teilbereich, der als Kreisbahn um den Mittelpunkt der Achse des zweiten Rollenorgans ausgebildet ist und einem zweiten Teilbereich, der als stetige Erhebungskurve ausgebildet ist. Advantageously, the axis of the second Rolienorgans is rigidly connected to the intermediate lever. In an advantageous embodiment, an active contour of the backdrop is formed as a circular path around the center of a third roller member of the Schiepphe els in Grundkreisaniage the camshaft. It is also advantageous if the Arbeltskurve the intermediate lever consists essentially of two sub-areas, a first portion which is formed as a circular path around the center of the axis of the second roller member and a second portion which is formed as a continuous elevation curve.
In vorteilhafter Weise bestehen die Federmittel aus einem Drehfederorgan, das mit einem ersten Ende an einem Zylindergehäuseteil anliegt und mit einem zweiten Ende auf ein Widerlager einwirkt, das starr mit dem Zwischenhebel verbunden ist, derart, dass eine Kraft in den Zwischenhebel eingeleitet ist, die sowohl die Führungsrolle an die Kulisse drückt, als auch die erste Rolle an die Nockenwelle drückt. Advantageously, the spring means consist of a torsion spring member which rests with a first end against a cylinder housing part and acts with a second end on an abutment which is rigidly connected to the intermediate lever, such that a force is introduced into the intermediate lever, both pushes the guide roller to the backdrop, as well as the first roller presses on the camshaft.
Die Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert. Die einzige Figur zeigt eine schematische Seitenansicht eines erfindungsgemäßen mechanisch steuerbaren Ventiltriebes. The invention will be explained in more detail with reference to a drawing. The single FIGURE shows a schematic side view of a mechanically controllable valve drive according to the invention.
Die grundsätzliche Wirkungsweise eines nachfolgend mechanischen Ventiltriebes ist hinlänglich unter dem Namen „UniValve" bekannt. Zur grundsätzlichen Funktionsweise eines derartigen Ventiltriebes wird auf die Patentanmeldungen DE 10 2004 003 327 AI und DE 10 2012 006 982 AI verwiesen. Figur 1 zeigt einen erfindungsgemäßen mechanisch steuerbaren Ventiltrieb 2 für ein angedeutetes Gaswechselventil 4 mit einer Übertragungsanordnung 5, die im vorliegenden Ausführungsbeispiel eine Zwischenhebelanordnung 6 und eine Schlepphebelanordnung 8 besitzt. Des Weiteren ist eine Ventilhubverstelleinrichtung 10 in Form einer mit einer Umfangskontur 9, die einen gegenüber einem Grundkreis 11 zurückversetzten exzentrischen Bereich aufweist, vorgesehen, die durch einen nicht dargestellten Aktuator angetrieben wird. Die Zwischenhebelanordnung 6 besitzt einen Zwischenhebel 12, der ein erstes Rollenorgan 14 aufweist, das In Wirkverbindung mit einer Umfangskontur 16 einer Nockenwelle 18 steht. Des Weiteren besitzt der Zwischenhebel 12 ein zweites Rollenorgan 20, das auf einer Achse 22 drehbar gelagert ist und mit der Ventilhubverstelleinrichtung 10 in Wirkverbindung steht, so dass auf bekannte Weise verschiedene Ventilhubpositionen des Gaswechselventils 4 einstellbar sind. Hierzu weist der Zwischenhebel 12 eine Arbeitskurve 24 auf, die auf bekannte Weise mit einem dritten Rollenorgan 26 eines Schlepphebels 28 der Schlepphebelanordnung 8 in Wirkverbindung steht. Die Arbeitskurve 24 des Zwischenhebels 12 weist hierbei im Wesentlichen zwei Teilbereiche 30, 32 auf. Der erste Teilbereich 30 ist hierbei wie dargestellt als Kreisbahn um den Mittelpunkt der Achse 22 des zweiten Rollenorgans 20 ausgebildet Der zweite Teilbereich 32 ist als stetige Erhebungskurve ausgebildet. The basic mode of operation of a subsequently mechanical valve drive is well known under the name "UniValve." For the basic mode of operation of such a valve drive, reference is made to patent applications DE 10 2004 003 327 A1 and DE 10 2012 006 982 A1. FIG. 1 shows a mechanically controllable valvetrain 2 according to the invention for an indicated gas exchange valve 4 with a transfer arrangement 5, which in the present embodiment has an intermediate lever arrangement 6 and a cam follower arrangement 8. Furthermore, a Ventilhubverstelleinrichtung 10 in the form of a having a peripheral contour 9, which has a relation to a base circle 11 recessed eccentric region provided, which is driven by an actuator, not shown. The intermediate lever assembly 6 has an intermediate lever 12, which has a first roller member 14, which is in operative connection with a peripheral contour 16 of a camshaft 18. Furthermore, the intermediate lever 12 has a second roller member 20, which is rotatably mounted on an axis 22 and is in operative connection with the valve lift adjusting device 10, so that in a known manner different valve lift positions of the gas exchange valve 4 are adjustable. For this purpose, the intermediate lever 12 has a working curve 24, which is in known manner with a third roller member 26 of a drag lever 28 of the finger lever assembly 8 in operative connection. The working curve 24 of the intermediate lever 12 in this case has essentially two partial areas 30, 32. The first portion 30 is hereby formed as a circular path around the center of the axis 22 of the second roller member 20 as shown. The second portion 32 is formed as a continuous elevation curve.
Um einen besonders kompakten und hinsichtlich der kinematischen Beziehungen optimalen Ventiltrieb 2 bereitzustellen, ist das zweite Rollenorgan 20 zusätzlich zu seiner Funktion als Angriffsfläche für die Ventilhubverstelleinrichtung 10 als Führungsrollenorgan ausgebildet, das zusammen mit einer Kulisse 34 als Führungsmittel 36 für den Zwischenhebel 12 dient. Es sollte deutlich sein, dass die Führungsmittel 36 auch als separate Führungsrollenorgane ausgebildet sein können, derart, dass auf der Achse 22 neben dem zweiten Rollenorgan 20 dann mindestens ein Führungsrollenorgan angeordnet ist, das auf die Kulisse 34 angreift. Die Achse 22 ist im vorliegenden Ausführungsbeispiel starr mit dem Zwischenhebel 12 verbunden, so dass dieser sehr verwindungssteif ausgeführt ist. Eine Wirkkontur 38 der Kulisse 32 ist n der Grundkreisanlage der Umfangskontur 16 der Nockenwelle 18 als Kreisbahn um den Mittelpunkt des dritten Rollenorgans 26 des Schlepphebels 28 der Schlepphebelanordnung 8 ausgebildet. In order to provide a particularly compact and optimal in terms of kinematic relationships valve train 2, the second roller member 20 is formed in addition to its function as an attack surface for the Ventilhubverstelleinrichtung 10 as a guide roller member, which serves as a guide means 36 for the intermediate lever 12 together with a link 34. It should be clear that the guide means 36 may also be formed as separate guide roller members, such that then at least one guide roller member is arranged on the axis 22 adjacent to the second roller member 20, which on the slide 34th attacks. The axis 22 is rigidly connected in the present embodiment with the intermediate lever 12, so that it is designed very torsionally rigid. An action contour 38 of the guide 32 is formed n of the base circle of the peripheral contour 16 of the camshaft 18 as a circular path about the center of the third roller member 26 of the finger lever 28 of the finger lever assembly 8.
Des Weiteren ist ein Drehfederorgan 40 vorgesehen, das mit einem ersten Ende 42 in einem Zylindergehäuseteil 43 gelagert ist und mit einem zweiten Ende 44 auf ein Widerlager 46 angreift, das starr mit dem Zwischenhebel 12 verbunden ist. Auf diese Weise wird eine Kraft in den Zwischenhebel 12 eingeleitet, die sowohl das Führungsrollenorgan 20 an die Kulisse 34 und die Ventilhubverstellelnrichtung 10 drückt, als auch die erste Rolle 14 an die Nockenwelle 18 drückt. Furthermore, a torsion spring member 40 is provided which is mounted with a first end 42 in a cylinder housing part 43 and engages with a second end 44 on an abutment 46 which is rigidly connected to the intermediate lever 12. In this way, a force is introduced into the intermediate lever 12, which presses both the guide roller member 20 to the link 34 and the Ventilhubverstellelnrichtung 10, as well as the first roller 14 to the camshaft 18 presses.
Figur 1 zeigt das Gaswechselventil 4 in einer geschlossenen Position, d. h., die Ventilhubverstelleinrichtung 10 liegt mit ihrem exzentrischen Bereich der Umfangskontur 9 an das zweite Rollenorgan 20 an. Die Nockenwelle 18 liegt mit dem Grundkreis 19 der Umfangskontur 16 am ersten Rollenorgan 14 an, was dazu führt, dass das Ventil geschlossen ist. Figure 1 shows the gas exchange valve 4 in a closed position, d. That is, the valve lift adjusting device 10 rests with its eccentric region of the circumferential contour 9 against the second roller member 20. The camshaft 18 abuts with the base circle 19 of the peripheral contour 16 on the first roller member 14, resulting in that the valve is closed.
Figur 2 zeigt nun den mechanisch steuerbaren Ventiltrieb 2 aus Figur 1 mit um 180° gedrehter Nockenwelle 18, so dass der exzentrische Bereich der Umfangskontur 16 in maximaler Position am ersten Rollenorgan 14 anliegt. Aufgrund der nicht veränderten Position der Ventilhubverstelleinrichtung 10 bleibt das Gaswechselventil 4 jedoch noch immer geschlossen. Lediglich der Bereich des Teilbereichs 30 der Arbeitskontur 24 hat sich gegenüber dem dritten Rollenorgan 26 verlagert. FIG. 2 now shows the mechanically controllable valve drive 2 from FIG. 1 with the camshaft 18 rotated through 180 °, so that the eccentric region of the circumferential contour 16 rests in the maximum position on the first roller member 14. Due to the unchanged position of the Ventilhubverstelleinrichtung 10 the gas exchange valve 4 remains but still closed. Only the region of the portion 30 of the working contour 24 has shifted relative to the third roller member 26.
Figur 3 zeigt nun den Ventiltrieb 2, bei dem die Ventilhubverstelleinrichtung 10 mit dem Grundkreis 11 der Umfangskontur 9 am zweiten Rol!enorgan 20 anliegt und folglich das Rollenorgan 20 maximal nach rechts auslenkt. Dadurch, dass die Nockenwelle 18 hier lediglich mit dem Grundkreis 19 am ersten Rollenorgan 14 anliegt, ist das Gaswechselventil in dieser Position geschlossen. FIG. 3 now shows the valve drive 2, in which the valve lift adjusting device 10 is connected to the base circle 11 of the peripheral contour 9 abuts the second Rol! Enorgan 20 and consequently the roller member 20 deflects a maximum to the right. The fact that the camshaft 18 rests here only with the base circle 19 on the first roller member 14, the gas exchange valve is closed in this position.
Figur 4 stellt nun den Maximalhub des Gaswechselventils 4 dar, wobei die Ventilhubversteiieinrichtung 10 mit dem Grundkreis 11 der Umfangskontur 9 am zweiten Rollenorgan 20 anliegt und die Nockenwelle 18 mit dem exzentrischen Bereich 16 am ersten Rollenorgan 14 anliegt. Die Arbeitskontur 24 tritt nun mit dem äußersten Teilbereich 32 in Kontakt mit dem dritten Rolienorgan 26 und verursacht auf diese Weise den Maximalhub des Gaswechselventils 4. FIG. 4 now shows the maximum stroke of the gas exchange valve 4, the valve lift stiffening device 10 abutting the base circle 11 of the peripheral contour 9 on the second roller element 20 and the camshaft 18 abutting the eccentric region 16 on the first roller element 14. The working contour 24 now comes with the outermost portion 32 in contact with the third Rolienorgan 26 and causes in this way the maximum stroke of the gas exchange valve. 4
Es sollte deutlich sein, dass zwischen den aufgezeigten Extrempositionen eine Vielzahl von Zwischenpositionen möglich sind, die eine Veränderung nicht nur des Ventilhubes und der Öffnungsdauer, sondern auch der Phasenlage der Ventilöffnung relativ zum Nocken- und damit zum Kurbelwinkel haben. It should be clear that a plurality of intermediate positions are possible between the indicated extreme positions, which have a change not only of the valve lift and the opening duration, but also the phase position of the valve opening relative to the cam and thus the crank angle.

Claims

P A T E N T A N S P R Ü C H E P A T E N T A N S P R E C H E
Mechanisch steuerbarer Ventiltrieb mit einem Gaswechselventil (4), wobei dem Gaswechselventil (4) eine Übertragungsanordnung (5) zugeordnet Ist, wobei die Übertragungsanordnung (5) eine Zwischenhebelanordnung (6) und eine Schlepphebelanordnung (8) aufweist, wobei ein Zwischenhebel (12) der Zwischenhebelanordnung (6) eine Arbeltskurve (24) zur Wirkverbindung mit einem Schlepphebel (28) der Schlepphebelanordnung (8) aufweist, wobei der Zwischenhebel (12) ein erstes Rollenorgan (14) aufweist, das In Wirkverbindung mit einer Umfangskontur (16) einer Nockenwelle (18) steht und wobei der Zwischenhebel (12) ein zweites Rollenorgan (20) aufweist, das auf einer Achse (22) drehbar gelagert ist, derart, dass das zweite Rollenorgan (20) mit einer Ventilhubverstelleinrichtung (10) in Wirkverbindung steht, derart, dass verschiedene Ventilhubpositionen einstellbar sind, wobei Federmittel vorgesehen sind, die auf die Zwischenhebelanordnung (6) angreifen und wobei Führungsmittel für die Zwischenhebelanordnung vorgesehen sind, dadurch gekennzeichnet, dass die Führungsmittel (36) aus einer Kulisse (34) bestehen, auf die mindestens ein Führungsrollenorgan, das im Bereich des zweiten Rolienorgans (20) vorgesehen ist, angreift. Mechanically controllable valve drive with a gas exchange valve (4), wherein the gas exchange valve (4) is assigned a transmission arrangement (5), wherein the transmission arrangement (5) comprises an intermediate lever arrangement (6) and a finger lever arrangement (8), wherein an intermediate lever (12) of Intermediate lever arrangement (6) has an Arbeltskurve (24) for operative connection with a drag lever (28) of the finger follower arrangement (8), wherein the intermediate lever (12) comprises a first roller member (14), in operative connection with a peripheral contour (16) of a camshaft ( 18) and wherein the intermediate lever (12) has a second roller member (20) which is rotatably mounted on an axle (22), such that the second roller member (20) is in operative connection with a Ventilhubverstelleinrichtung (10), in such that different Ventilhubpositionen are adjustable, wherein spring means are provided which act on the intermediate lever assembly (6) and wherein guide means for the Zwischenheb Elanordnung are provided, characterized in that the guide means (36) consist of a link (34) on which at least one guide roller member, which is provided in the region of the second Rolienorgans (20) engages.
Mechanisch steuerbarer Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass das Führungsrollenorgan das zweite Rolienorgan (20) ist. Mechanically controllable valve drive according to claim 1, characterized in that the guide roller member is the second Rolienorgan (20).
Mechanisch steuerbarer Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass mindestens ein separates Führungsrollenorgan auf der Achse des zweiten Rollenorgans gelagert ist. Mechanisch steuerbarer Ventiltrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Achse (22) des zweiten Rollenorgans (20) starr mit dem Zwischenhebel (12) verbunden ist, Mechanically controllable valve drive according to claim 1, characterized in that at least one separate guide roller member is mounted on the axis of the second roller member. Mechanically controllable valve drive according to one of the preceding claims, characterized in that the axis (22) of the second roller member (20) is rigidly connected to the intermediate lever (12),
Mechanisch steuerbarer Ventiftrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Wirkkontur (38) der Kulisse (34) als Kreisbahn um den Mittelpunkt eines dritten Rollenorgans (26) des Schlepphebels (28) in Grundkreisanlage der Nockenwelle (18) ausgebildet ist. Mechanically controllable Ventiftrieb according to one of the preceding claims, characterized in that an active contour (38) of the link (34) is formed as a circular path about the center of a third roller member (26) of the finger lever (28) in Grundkreisanlage the camshaft (18).
Mechanisch steuerbarer Ventiltrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Arbeitskurve (24) des Zwischenhebels (12) im Wesentlichen aus zwei Teilbereichen (30, 32) besteht, einem ersten Teilbereich (30), der als Kreisbahn um den Mittelpunkt der Achse (22) des zweiten Rollenorgans (20) ausgebildet ist und einem zweiten Teilbereich (32) der als stetige Erhebungskurve ausgebildet ist. 7. Mechanisch steuerbarer Ventiltrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Federmittel aus einem Drehfederorgan (40) bestehen, das mit einem ersten Ende (42) an einem Zylindergehäuseteil (43) anliegt und mit einem zweiten Ende (44) auf ein Widerlager (46) einwirkt, das starr mit dem Zwischenhebel (12) verbunden ist, derart, dass eine Kraft in den Zwischenhebel eingeleitet ist, die sowohl die Führungsrollenorgan an die Kulisse (34) drückt, als auch die erste Rolle (14) an die Nockenwelle (18) drückt. Mechanically controllable valve drive according to one of the preceding claims, characterized in that the working curve (24) of the intermediate lever (12) essentially consists of two subregions (30, 32), a first subregion (30) which is in the form of a circular path about the center of the axis (22) of the second roller member (20) is formed and a second portion (32) is formed as a continuous elevation curve. 7. Mechanically controllable valve drive according to one of the preceding claims, characterized in that the spring means consist of a torsion spring member (40) which bears with a first end (42) on a cylinder housing part (43) and with a second end (44) on a Abutment (46) which is rigidly connected to the intermediate lever (12), such that a force is introduced into the intermediate lever, which presses both the guide roller member against the link (34), and the first roller (14) to the Camshaft (18) presses.
EP15718934.1A 2014-07-09 2015-04-30 Mechanically controllable valve drive Active EP3167168B1 (en)

Applications Claiming Priority (2)

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DE102014109573.1A DE102014109573A1 (en) 2014-07-09 2014-07-09 Mechanically controllable valve train
PCT/EP2015/059524 WO2016005071A1 (en) 2014-07-09 2015-04-30 Mechanically controllable valve drive

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EP3167168A1 true EP3167168A1 (en) 2017-05-17
EP3167168B1 EP3167168B1 (en) 2019-09-25

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CN (1) CN106489020B (en)
DE (1) DE102014109573A1 (en)
WO (1) WO2016005071A1 (en)

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DE102016122179A1 (en) * 2016-11-18 2018-05-24 Pierburg Gmbh Mechanically controllable valve train
DE102017124273A1 (en) * 2017-10-18 2019-04-18 Schaeffler Technologies AG & Co. KG Internal combustion engine with OHV valve train

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DE10226300B4 (en) * 2002-06-10 2004-09-30 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Device for the variable actuation of valves by means of cams for internal combustion engines
DE20220138U1 (en) 2002-12-20 2004-04-29 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Valve train with cams for variable actuation of valves for internal combustion engines
DE10123186A1 (en) 2001-05-12 2002-11-14 Bayerische Motoren Werke Ag Valve gear device for variable lift adjustment is for gas exchange valve of internal combustion engine and has valve vai intermediary of transmission component effectively connected to roller movable around rotary axis
DE10235403A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
DE10235402A1 (en) * 2002-08-02 2004-02-12 Bayerische Motoren Werke Ag Swivel lever for a variable stroke valve train
US7895981B2 (en) * 2003-03-29 2011-03-01 Entec Consulting Gmbh Variable valve lift device for the lift adjustment of gas-exchange valves of an internal combustion engine
DE102004003327A1 (en) 2004-01-22 2005-09-29 Entec Consulting Gmbh Variable valve lift device for internal combustion engine, has rotatable eccentric shaft having eccentrics contours positioned within circle formed by external diameter of bearings of eccentric shaft
DE102004040652A1 (en) * 2004-08-20 2006-02-23 Rolf Jung Completely-variable five-section valve gear for internal combustion engine, includes guide rocker, moving connection adjuster, control pawl and cam track
DE102004049538A1 (en) * 2004-10-10 2006-04-13 Rolf Jung Fully variable lift valve controller for internal combustion engine has intermediate element in form of pivotable rocker arm acted upon by cam or camshaft at first engagement surface with control block at free end
DE102005035314B4 (en) * 2005-07-28 2013-03-14 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Valve train for charge exchange valves of four-stroke internal combustion engines
JP4535973B2 (en) * 2005-09-15 2010-09-01 株式会社オティックス Variable valve mechanism
DE102010009399A1 (en) * 2010-02-26 2011-09-01 Schaeffler Technologies Gmbh & Co. Kg Operating lever for stroke-variable gas exchange valve gear of internal-combustion engine, has lever housing, which is formed with two side panels and base, which is connected with side panels
DE102012006982A1 (en) 2012-04-05 2013-10-10 Kolbenschmidt Pierburg Innovations Gmbh Mechanically controllable valve drive with a gas outlet valve and mechanically controllable valve train arrangement and internal combustion engine

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US10851683B2 (en) 2020-12-01
WO2016005071A1 (en) 2016-01-14
CN106489020A (en) 2017-03-08
US20170198614A1 (en) 2017-07-13
DE102014109573A1 (en) 2016-01-14
CN106489020B (en) 2019-10-01
EP3167168B1 (en) 2019-09-25

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