DE10148243A1 - Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement - Google Patents

Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement

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Publication number
DE10148243A1
DE10148243A1 DE10148243A DE10148243A DE10148243A1 DE 10148243 A1 DE10148243 A1 DE 10148243A1 DE 10148243 A DE10148243 A DE 10148243A DE 10148243 A DE10148243 A DE 10148243A DE 10148243 A1 DE10148243 A1 DE 10148243A1
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DE
Germany
Prior art keywords
valve
locking
cam piece
cam
gas exchange
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Withdrawn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
DE10148243A
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German (de)
Inventor
Harald Elendt
Christof Faria
Frank Himsel
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
INA Schaeffler KG
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Publication date
Application filed by INA Schaeffler KG filed Critical INA Schaeffler KG
Priority to DE10148243A priority Critical patent/DE10148243A1/en
Publication of DE10148243A1 publication Critical patent/DE10148243A1/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Withdrawn legal-status Critical Current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
    • 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
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead 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
    • 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
    • F01L1/08—Shape of cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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

Abstract

Valve drive with valve lift changing for the gas shuttle valve (17) of a four-stroke internal combustion engine comprises a toothed shaft (2) with an axial external tooth arrangement (19) and at least one cam part (3) per cylinder head (1) having a corresponding internal tooth arrangement and arranged on the cam shaft so that it is rotationally fixed but axially displaceable. The cam part has per gas shuttle valve at least two adjacent gas shuttle cams (7, 8) with different lift and identical diameter and two preferably symmetrical sliding grooves (9, 9') on the periphery of the cam part. Actuator pins (10, 10') fixed to the housing and radially moving on the cam part interact with the sliding grooves to axial displace the cam part. The cam part is axially fixed in specific positions by locking devices and locking grooves (18, 18'). The locking device is fixed on the cylinder head and a first and a second locking groove is provided on the outer periphery of the cam pa rt.

Description

Gebiet der ErfindungField of the Invention

Die Erfindung betrifft einen Ventiltrieb mit Ventilhubumschaltung für die Gaswechselventile eines 4-Takt-Verbrennungsmotors, insbesondere nach dem Oberbegriff des Patentanspruchs 1. The invention relates to a valve train with valve lift switching for Gas exchange valves of a 4-stroke internal combustion engine, especially after Preamble of claim 1.

In der DE 196 11 641 C1 ist ein Ventiltrieb mit Ventilhubumschaltung für Gaswechselventile eines 4-Takt-Verbrennungsmotors beschrieben mit folgenden Merkmalen:

  • - Eine Zahnwelle mit axialer Außenverzahnung und zumindest einem Nockenstück pro Zylinder, das eine dazu passende Innenverzahnung aufweist und das verdrehfest sowie axial verschiebbar auf der Zahnwelle angeordnet ist;
  • - das Nockenstück weist pro Gaswechselventil zumindest zwei nebeneinander liegende Nocken mit unterschiedlichem Hub und gleichem Grundkreisdurchmesser sowie zwei am Umfang des Nockenstücks angeordnete, vorzugsweise spiegelsymmetrisch ausgebildete Verschiebenuten auf;
  • - gehäusefeste, radial zu dem Nockenstück hin bewegbare Aktuatorstifte, durch deren Zusammenwirken mit den Verschiebenuten das Nockenstück axial verschiebbar ist, wobei das Nockenstück durch Rastmittel und Rastrillen in bestimmten Rastpositionen axial fixierbar ist.
DE 196 11 641 C1 describes a valve train with valve lift switching for gas exchange valves of a 4-stroke internal combustion engine with the following features:
  • - A splined shaft with axial external toothing and at least one cam piece per cylinder, which has a matching internal toothing and which is arranged on the splined shaft in a rotationally fixed and axially displaceable manner;
  • - The cam piece has at least two cams lying next to each other with different strokes and the same base circle diameter per gas exchange valve as well as two, preferably mirror-symmetrically designed sliding grooves arranged on the circumference of the cam piece;
  • - Actuator pins fixed to the housing and movable radially towards the cam piece, by virtue of their interaction with the sliding grooves, the cam piece can be axially displaced, the cam piece being axially fixable in certain latching positions by latching means and latching grooves.

Mit diesem Ventiltrieb können unterschiedliche Ventilhübe beim Einlaßventil und damit ein Entdrosseln der Einlaßseite verwirklicht werden. Dadurch können die Teillastverbräuche und die Schadstoffemission insbesondere von Ottomotoren gesenkt werden. With this valve train, different valve strokes can be made on the intake valve and thus a dethrottling of the inlet side can be realized. Thereby can the partial load consumption and pollutant emissions in particular from Otto engines are lowered.

Die axiale Fixierung des Nockenstücks in der Position des jeweils aktiven Nockens geschieht im vorliegenden Fall durch eine in der Zahnwelle angeordnete, federbelastete Kugel, die in Rillen auf der Innenseite des Nockenstücks einrastet. Dadurch beeinflußt eine Längenänderung der Zahnwelle die Lage des Nockenstücks. The axial fixation of the cam piece in the position of the active one In the present case, the cam is caused by a spring-loaded ball, which is in grooves on the inside of the cam piece locks. This affects a change in length of the spline the position of the Cam piece.

Die Platzverhältnisse am vorliegenden Zylinderkopf sind durch die mindestens doppelte Anzahl der Nocken pro Gaswechselventil besonders beengt. In die Auslegung der Nockenbreite gehen bei axial verschiebbaren Nocken neben der zulässigen Flächenpressung auch geometrische Verhältnisse durch Toleranzen und unterschiedliche Wärmedehnungen ein. The space available on the cylinder head is at least double the number of cams per gas exchange valve particularly restricted. In the In the case of axially displaceable cams, the design of the cam width is adjacent geometrical conditions due to the permissible surface pressure Tolerances and different thermal expansions.

Die vorliegende axiale Fixierung der Nockenstücke an der Zahnwelle hat den Nachteil, daß die erhebliche Differenzdehnung zwischen dem üblicherweise aus Leichtmetall bestehenden Zylinderkopf und der Stahl- oder Gußzahnwelle bei der Auslegung der Nockenbreite berücksichtigt werden muß. The present axial fixation of the cam pieces on the toothed shaft has the Disadvantage that the considerable differential expansion between the usual cylinder head made of light metal and the steel or cast toothed shaft must be taken into account when designing the cam width.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt deshalb die Aufgabe zugrunde bei dem gattungsgemäßen Ventiltrieb den Einfluß der Wärmedehnungsdifferenz zwischen Zahnwelle und Zylinderkopf auf die Lage der Nocken möglichst klein zu halten. The invention is therefore based on the object in the generic Valve train the influence of the thermal expansion difference between the spline and Keep the cylinder head as small as possible on the position of the cams.

Zusammenfassung der ErfindungSummary of the invention

Die Aufgabe wird gelöst durch die Merkmale des Patentanspruchs 1. Durch die Anordnung des Rastmittels im Zylinderkopf und der Rastrillen im Nockenstück kann sich die Zahnwelle ohne Einfluß auf die Lage des Nockenstücks ausdehnen. Die unterschiedliche Wärmeausdehnung der Zahnwelle und des Zylinderkopfs haben keinerlei Einfluß auf die Lage der Gaswechselnocken zu den Rollen der Nockenfolger und damit auf die erforderliche Breite der Gaswechselnocken. Es verbleibt nur die Differenzdehnung zwischen dem im Vergleich zur Zahnwelle kurzen Nockenstück und dem Zylinderkopf. The object is achieved by the features of patent claim 1 Arrangement of the locking means in the cylinder head and the locking grooves in the cam piece the splined shaft can affect the position of the cam piece expand. The different thermal expansion of the spline and the Cylinder head have no influence on the position of the gas exchange cams Roll the cam follower and thus on the required width of the Gas exchange cam. There is only the differential expansion between that in the comparison to the spline short cam piece and the cylinder head.

Eine vorteilhafte Weiterbildung der Erfindung besteht darin, daß das Rastmittel in einem Gleitlager für das Nockenstück angeordnet ist. Auf diese Weise wird kein zusätzlicher Platz für das Rastmittel benötigt. Das Gleitlager für das Nockenstück dient zugleich als Stütze für die in dem Nockenstück geführte Zahnwelle, die sich unabhängig von diesem ausdehnen kann. An advantageous development of the invention is that the locking means is arranged in a slide bearing for the cam piece. That way no additional space is required for the locking device. The plain bearing for that Cam piece also serves as a support for the guided in the cam piece Toothed shaft that can expand independently of this.

Von Vorteil ist auch, daß das Gleitlager im Bereich der Mitte zwischen den Gaswechselventilen eines Zylinders angeordnet ist. Durch diese Anordnung des Gleitlagers ist die Biegebeanspruchung von Nockenstück und Zahnwelle gering und damit die Steifheit des Ventiltriebs hoch. It is also advantageous that the plain bearing in the middle between the Gas exchange valves of a cylinder is arranged. By this arrangement of the plain bearing is the bending stress of the cam piece and spline low and thus the rigidity of the valve train high.

Eine vorteilhafte Weiterbildung der Erfindung besteht darin, daß die Rastrillen vorzugsweise in der Mitte zwischen den Nockenpaaren angeordnet sind. Dadurch wird die ohnedies geringe Dehnlänge des Nockenstücks halbiert und damit die Differenzdehnung minimiert. Die Dehnlänge des Nockenstücks entspricht dem Abstand der jeweiligen Rastrille von den durch sie rastierten Nocken. Da dieser Abstand gering ist, spielt die Dehnungsdifferenz zwischen dem Nockenstück und dem Zylinderkopf praktisch keine Rolle. An advantageous development of the invention is that the locking grooves are preferably arranged in the middle between the pairs of cams. As a result, the already small stretch length of the cam piece is halved and thus minimizing the differential expansion. The stretch length of the cam piece corresponds to the distance of the respective locking groove from those locked by it Cam. Since this distance is small, the difference in elongation plays between the Cam piece and the cylinder head practically no role.

Dadurch, daß das Rastmittel in bekannter Weise als eine von einer Feder belastete Rastkugel ausgebildet ist, die jedoch in einer Patrone mit Hubbegrenzung angeordnet sind, ist die Montage desselben besonders einfach. The fact that the locking means in a known manner as one of a spring loaded locking ball is formed, but with a cartridge Stroke limitation are arranged, the assembly of the same is particularly simple.

Eine besonders einfache Lösung einer Hubbegrenzung der Rastkugel besteht darin, daß der Rand der Patrone eingebördelt ist. A particularly simple solution to a stroke limitation of the locking ball is provided in that the edge of the cartridge is crimped.

Dadurch, daß die Rastrillen einen zur Rastkugel passenden Querschnitt aufweisen, wird eine sichere, verschleißarme Rastung erreicht. The fact that the locking grooves have a cross section matching the locking ball have a secure, low-wear detent is achieved.

Von Vorteil ist auch, daß die Reihenfolge des ersten und zweiten Gaswechselnockens bei beiden Nockenpaaren gleich ist. It is also advantageous that the order of the first and second The gas exchange cam is the same for both pairs of cams.

Für ein funktionsgerechtes Arbeiten des erfindungsgemäßen Ventiltriebs ist es wichtig, daß der Mittenabstand der Rastrillen dem Mittenabstand des ersten und zweiten Gaswechselnockens der Nockenpaare entspricht. It is necessary for the valve train according to the invention to function properly important that the center distance of the locking grooves is the center distance of the first and second gas exchange cam of the cam pairs.

Es hat sich als vorteilhaft herausgestellt, daß der Abstand zwischen der im Eingriff befindlichen Rastrille und dem im Betrieb befindlichen Gaswechselnocken gleich groß ist. It has proven to be advantageous that the distance between the in Engaged locking groove and the one in operation Gas exchange cam is the same size.

Kurze Beschreibung der ZeichnungBrief description of the drawing

Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung, den Patentansprüchen und der dazugehörigen Zeichnung, auf der Ausführungsbeispiele der Erfindung schematisch dargestellt sind. Further features of the invention result from the following Description, the claims and the accompanying drawing on which Embodiments of the invention are shown schematically.

Die einzige Figur zeigt einen Teilschnitt durch einen Zylinderkopf mit einem Nockenstück und zwei Nockenfolgern. The single figure shows a partial section through a cylinder head with a Cam piece and two cam followers.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Auf der einzigen Figur ist ein Teilschnitt eines Zylinderkopfs 1 dargestellt, mit einer Zahnwelle 2, die mit einer axialen Außenverzahnung 19 ausgebildet ist. In the single figure, a partial section of a cylinder head 1 is shown, with a toothed shaft 2 , which is formed with an axial external toothing 19 .

Auf der Zahnwelle 2 ist ein Nockenstück 3 mit einer zur Zahnwelle 2 passenden Innenverzahnung verdrehfest und axial verschiebbar angeordnet. Am Außenumfang des Nockenstücks 3 befindet sich in dessen Mittenbereich eine Lagerstelle 4, die in einem Gleitlager 5 des Zylinderkopfs 1 gelagert ist. Die Breite der Lagerstelle 4 entspricht der Breite des Gleitlagers 5 vermehrt um den Verschiebeweg des Nockenstücks 3 und um einen Spielbetrag. On the splined shaft 2 is a cam piece 3 is rotationally fixed with an appropriate dental shaft 2 and internal teeth disposed axially displaceable. On the outer circumference of the cam piece 3 there is a bearing point 4 in the central area thereof, which is mounted in a slide bearing 5 of the cylinder head 1 . The width of the bearing point 4 corresponds to the width of the plain bearing 5, increased by the displacement of the cam piece 3 and by an amount of play.

Beidseits der Lagerstelle 4 befindet sich je ein Nockenpaar 6 mit je einem ersten und zweiten Gaswechselnocken 7, 8. Diese sind in gleicher Reihenfolge nebeneinander angeordnet und besitzen einen ungleichen Hub, jedoch einen gleichen Grundkreisdurchmesser. There is a pair of cams 6 with a first and a second gas exchange cam 7 , 8 on each side of the bearing point 4 . These are arranged next to each other in the same order and have an unequal stroke, but the same base circle diameter.

An den Enden des Nockenstücks 3 ist an dessen Umfang je eine schraubenförmige Verschiebenut 9, 9' angeordnet. Die Verschiebenuten 9, 9' sind vorzugsweise spiegelsymmetrisch ausgebildet, d. h. sie haben eine gegenläufige Steigung. Sie besitzen eine bestimmte Tiefe und laufen an ihren beiden Enden in die Kontur des Nockenstücks 3 aus. At the ends of the cam piece 3 , a helical displacement groove 9 , 9 'is arranged on the circumference thereof. The sliding grooves 9 , 9 'are preferably mirror-symmetrical, ie they have an opposite slope. They have a certain depth and run into the contour of the cam piece 3 at both ends.

Für jede Verschiebenut 9, 9' ist ein Gehäuse fester, radial bewegbarer Aktuatorstift 10, 10' vorgesehen, der in dieselben ein- und ausfahrbar ist. Dadurch wird das Nockenstück 3 um die Breite der Gaswechselnocken 7, 8 zwischen seinen Endlagen hin- und hergeschoben. Auf diese Weise gelangen der eine oder der andere Gaswechselnocken 7, 8 beider Nockenpaare 6 durch die Aktuatorstifte 10, 10' gesteuert in Druckkontakt mit den Rollen 11 der Nockenfolger 12. Letztere beaufschlagen die Gaswechselventile 17. For each sliding groove 9 , 9 ', a housing of fixed, radially movable actuator pin 10 , 10 ' is provided, which can be extended and retracted into the same. Characterized the cam piece 3 is pushed back and forth between its end positions by the width of the gas exchange cams 7 , 8 . In this way, one or the other gas exchange cams 7 , 8 of both pairs of cams 6 come into pressure contact with the rollers 11 of the cam followers 12, controlled by the actuator pins 10 , 10 '. The latter act on the gas exchange valves 17 .

Die axiale Verschiebung der Gaswechselnocken 7, 8 ist nur in deren Grundkreisphase möglich, was eine entsprechende Winkellage der Verschiebenuten 9, 9' zu den Gaswechselnocken 7, 8 voraussetzt. The axial displacement of the gas exchange cams 7 , 8 is only possible in their base circle phase, which requires a corresponding angular position of the displacement grooves 9 , 9 'to the gas exchange cams 7 , 8 .

Die Aktuatorstifte 10, 10' bewirken nur eine Verschiebung des Nockenstücks 3, nicht aber dessen Lagefixierung. Dazu dient ein Rastmittel in Gestalt einer federbelasteten Rastkugel 13, die in einer Patrone 14 mit Vorspannung durch eine Feder 15 und durch einen eingebördelten Patronenrand 16 im Hub begrenzt angeordnet ist. Die Patrone 14, die einfach zu montieren ist, sitzt in der Mitte des Gleitlagers 5 und weist gleichen Abstand zu den Rollen 11 der beiden Nockenfolger 12 auf. Die Rastkugel 13 rastet in den Endlagen des Nockenstücks 3 abwechselnd in eine der beiden Rastrillen 18, 18' ein, die symmetrisch zur Mitte der Lagerstelle 4 und damit in gleicher Entfernung zu den Nockenpaaren 6 angeordnet sind. Sie weisen einen zur Rastkugel 13 passenden Querschnitt auf, der eine sichere Rastung mit geringer Verschleißneigung verbindet. The actuator pins 10 , 10 'only cause a displacement of the cam piece 3 , but not its position fixation. For this purpose, a locking means in the form of a spring-loaded locking ball 13 is used , which is arranged in a cartridge 14 with prestress by a spring 15 and by a crimped cartridge edge 16 in the stroke. The cartridge 14 , which is easy to assemble, sits in the middle of the slide bearing 5 and is equidistant from the rollers 11 of the two cam followers 12 . The locking ball 13 snaps in the end positions of the cam piece 3 alternately into one of the two locking grooves 18 , 18 ', which are arranged symmetrically to the center of the bearing point 4 and thus at the same distance from the pairs of cams 6 . They have a cross section matching the locking ball 13 , which connects a secure locking with a low tendency to wear.

Um das erforderliche Axialspiel zwischen dem Nockenpaar 6 und dem Gleitlager 5 kleinzuhalten, müssen Dehnungseinflüsse niedrig gehalten werden. Dies geschieht durch die geringe Dehnlänge des Nockenstücks 3, die sich von der jeweils rastierten Rastrille 18, 18' bis zur nächsten Flanke des im Eingriff befindlichen Gaswechselnockens 7, 8 erstreckt. In order to keep the required axial play between the pair of cams 6 and the slide bearing 5 small, the effects of expansion must be kept low. This takes place due to the small extension length of the cam piece 3 , which extends from the respectively latched locking groove 18 , 18 'to the next flank of the gas exchange cam 7 , 8 in engagement.

Durch die Hubverringerung der Gaswechselventile 17 wird eine Entdrosselung der Ansaugseite des Ottomotors erreicht, die eine Verringerung von dessen Teillastverbrauch und Schadstoffemission zur Folge hat. Bezugszahlenliste 1 Zylinderkopf
2 Zahnwelle
3 Nockenstück
4 Lagerstelle
5 Gleitlager
6 Nockenpaar
7 erster Gaswechselnocken
8 zweiter Gaswechselnocken
9 Verschiebenut
9' andere Verschiebenut
10 Aktuatorstift
10' anderer Aktuatorstift
11 Rolle
12 Nockenfolger
13 Rastkugel
14 Patrone
15 Feder
16 Patronenrand
17 Gaswechselventil
18 Rastrille
18' andere Rastrille
19 axiale Außenverzahnung
By reducing the stroke of the gas exchange valves 17 , the intake side of the gasoline engine is dethrottled, which results in a reduction in its partial load consumption and pollutant emissions. List of reference numbers 1 cylinder head
2 splines
3 cam piece
4 depository
5 plain bearings
6 pairs of cams
7 first gas exchange cam
8 second gas exchange cam
9 Sliding groove
9 'other sliding groove
10 actuator pin
10 'other actuator pin
11 roll
12 cam followers
13 locking ball
14 cartridge
15 spring
16 cartridge rim
17 gas exchange valve
18 notch
18 'other locking groove
19 axial external toothing

Claims (9)

1. Ventiltrieb mit einer Ventilhubumschaltung für die Gaswechselventile (17) eines 4-Takt-Verbrennungsmotors, mit folgenden Merkmalen: - Eine Zahnwelle (2) mit axialer Außenverzahnung(19) und zumindest einem Nockenstück (3) pro Zylinderkopf (1), das eine dazu passende Innenverzahnung aufweist und das verdrehfest sowie axial verschiebbar auf der Nockenwelle (3) angeordnet ist; - das Nockenstück (3) weist pro Gaswechselventil (17) zumindest zwei nebeneinander liegende Gaswechselnocken (7, 8) mit unterschiedlichem Hub und gleichem Grundkreisdurchmesser sowie zwei am Umfang des Nockenstücks (3) angeordnete, vorzugsweise spiegelsymmetrisch ausgebildete Verschiebenuten (9, 9') auf; - gehäusefeste, radial zu dem Nockenstück (3) hin bewegbare Aktuatorstifte (10, 10'), durch deren Zusammenwirken mit den Verschiebenuten (9, 9') das Nockenstück (3) axial verschiebbar ist, wobei das Nockenstück (3) durch Rastmittel und Rastrillen (18, 18') in bestimmten Rastpositionen axial fixierbar ist, dadurch gekennzeichnet, dass das Rastmittel zylinderkopffest angeordnet und eine erste und zweite Rastrille (18, 18') am Außenumfang des Nockenstücks (3) vorgesehen ist. 1. Valve train with a valve lift switch for the gas exchange valves ( 17 ) of a 4-stroke internal combustion engine, with the following features: - A toothed shaft ( 2 ) with axial external toothing ( 19 ) and at least one cam piece ( 3 ) per cylinder head ( 1 ), which has a matching internal toothing and which is arranged on the camshaft ( 3 ) in a rotationally fixed and axially displaceable manner; - The cam piece ( 3 ) has, per gas exchange valve ( 17 ), at least two gas exchange cams ( 7 , 8 ) lying next to each other with different strokes and the same base circle diameter, and two, preferably mirror-symmetrically designed sliding grooves ( 9 , 9 ') arranged on the circumference of the cam piece ( 3 ) ; - Housing-fixed, radially to the cam piece ( 3 ) movable actuator pins ( 10 , 10 '), by their interaction with the sliding grooves ( 9 , 9 ') the cam piece ( 3 ) is axially displaceable, the cam piece ( 3 ) by locking means and Locking grooves ( 18 , 18 ') can be axially fixed in certain locking positions, characterized in that the locking means are arranged fixed to the cylinder head and a first and second locking groove ( 18 , 18 ') is provided on the outer circumference of the cam piece ( 3 ). 2. Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass das Rastmittel in einem Gleitlager (5) für das Nockenstück (3) angeordnet ist. 2. Valve train according to claim 1, characterized in that the latching means is arranged in a slide bearing ( 5 ) for the cam piece ( 3 ). 3. Ventiltrieb nach Anspruch 2, dadurch gekennzeichnet, dass das Gleitlager (5) im Bereich der Mitte zwischen den Gaswechselventilen (17) des Zylinderkopfes (1) angeordnet 'ist. 3. Valve train according to claim 2, characterized in that the sliding bearing ( 5 ) is arranged in the middle between the gas exchange valves ( 17 ) of the cylinder head ( 1 ) '. 4. Ventiltrieb nach Anspruch 3, dadurch gekennzeichnet, dass die Rastrillen (18, 18'), die in der Mitte zwischen den Nockenpaaren (6) angeordnet sind, einen Mittenabstand gleich dem der Nocken (6, 7) aufweisen. 4. Valve train according to claim 3, characterized in that the locking grooves ( 18 , 18 '), which are arranged in the middle between the pairs of cams ( 6 ), have a center distance equal to that of the cams ( 6 , 7 ). 5. Ventiltrieb nach Anspruch 4, dadurch gekennzeichnet, dass das Rastmittel in bekannter Weise als eine von einer Feder (15) belastete Rastkugel (13) ausgebildet ist, die in einer Patrone (14) mit Hubbegrenzung angeordnet ist. 5. Valve drive according to claim 4, characterized in that the locking means is designed in a known manner as a spring ( 15 ) loaded locking ball ( 13 ) which is arranged in a cartridge ( 14 ) with stroke limitation. 6. Ventiltrieb nach Anspruch 5, dadurch gekennzeichnet, dass als Hubbegrenzung ein eingebördelter Patronenrand (16) dient. 6. Valve train according to claim 5, characterized in that a crimped cartridge edge ( 16 ) serves as a stroke limitation. 7. Ventiltrieb nach Anspruch 6, dadurch gekennzeichnet, dass die Rastrillen (18, 18') einen zur Rastkugel (13) passenden Querschnitt aufweisen. 7. Valve train according to claim 6, characterized in that the locking grooves ( 18 , 18 ') have a cross-section matching the locking ball ( 13 ). 8. Ventiltrieb nach Anspruch 7, dadurch gekennzeichnet, dass die Reihenfolge des ersten und zweiten Gaswechselnockens (7, 8) bei beiden Nockenpaaren (6) gleich ist. 8. Valve train according to claim 7, characterized in that the sequence of the first and second gas exchange cams ( 7 , 8 ) is the same for both pairs of cams ( 6 ). 9. Ventiltrieb nach Anspruch 8, dadurch gekennzeichnet, dass der Abstand zwischen der im Eingriff befindlichen Rastrille (18, 18') und dem im Betrieb befindlichen Gaswechselnocken (7, 8) gleich groß ist. 9. Valve train according to claim 8, characterized in that the distance between the engaging locking groove ( 18 , 18 ') and the gas exchange cam ( 7 , 8 ) in operation is the same size.
DE10148243A 2001-09-28 2001-09-28 Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement Withdrawn DE10148243A1 (en)

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Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20150210

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee