WO2016110283A1 - Sliding cam valve train - Google Patents

Sliding cam valve train Download PDF

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Publication number
WO2016110283A1
WO2016110283A1 PCT/DE2015/200530 DE2015200530W WO2016110283A1 WO 2016110283 A1 WO2016110283 A1 WO 2016110283A1 DE 2015200530 W DE2015200530 W DE 2015200530W WO 2016110283 A1 WO2016110283 A1 WO 2016110283A1
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WO
WIPO (PCT)
Prior art keywords
cam
camshaft
group
cam group
valve drive
Prior art date
Application number
PCT/DE2015/200530
Other languages
German (de)
French (fr)
Inventor
Harald Elendt
Claudia Zielinski
Andreas Nendel
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2016110283A1 publication Critical patent/WO2016110283A1/en

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • 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

Definitions

  • the invention relates to a sliding cam valve drive for a four-stroke reciprocating internal combustion engine, with a camshaft on which rotatably and axially movable cam group runs, which is assigned at least one cam follower and acted upon by an actuator in at least one axial direction.
  • Task is therefore to develop a simple design, very inexpensive sliding cam valve drive.
  • this object is achieved in that on the camshaft only that cam group rotatably and axially movable, which cam group directly adjacent to at least one end face of the camshaft, said outer cam group is acted upon by one of its outer end aligned upstream actuator in at least one axial direction.
  • the novel sliding cam valve drive is provided for a multi-valve DOHC single-cylinder engine, wherein only one end-side cam group is provided on preferably one of the two camshafts (intake camshaft, for example).
  • the further inlet cam is shown as a standard cam, so that its associated gas exchange valve experiences no Hubvariabiltician.
  • cam follower in particular lever-like components such as swing, drag or rocker arm come into question. However, it is also thought of cup, roll or mushroom pestles; assuming appropriate space.
  • the frontally aligned to the camshaft upstream actuator can, for example, be of electromagnetic design and in the energized state via the pin which displace only one cam group in the camshaft direction and hold there against compression spring force.
  • the cam group can be in contact with the counter-rotor via its low-lift cam.
  • a provision of the displaced via the actuator cam group away from the camshaft is about the o.
  • Compression spring proposed as a helical compression spring. Instead of the o.
  • Electromagnetic actuator and hydraulic actuators, etc. are conceivable and provided.
  • the pot-like cam group which for example consists of a 2 or 3 cam package
  • its bottom be made of a nem separate component such as a disc represent, which is subsequently connected, for example. Via a press fit or a thread with a bore of the cam group or the end face.
  • a simple rotation of the cam group on the camshaft is the subject of another subclaim. Accordingly, the bore of the cam group and an outer shell of the camshaft, for example, should have inter-engaged flax. Conceivable and provided, however, is a spline on the camshaft, which is in engagement with a corresponding counter-profile of the cam group.
  • FIG. 1 shows a three-dimensional view of a sliding cam valve drive
  • FIG. 2 shows a partial view of the camshaft of the sliding cam valve drive with cam group in longitudinal section.
  • Fig. 1 Shown in Fig. 1 is a sliding cam valve driver 1 for a multi-valve DOHC single-cylinder engine (two equivalent intake and exhaust valves (20, -)).
  • the sliding cam valve drive 1 comprises a short-building camshaft 2 (here intake camshaft), on which left drawn a non-rotatable and axially movable cam group 3 with a small stroke cam 16 and a Quihubnocken 17 integrally connected thereto. To the right of the cam group 3, a standard cam 18 is shown, which is subsequently followed by a not signed camshaft bearing.
  • the cam group 3 directly adjoins an end face 4 of the camshaft 2 shown here on the left and, in this position, acts on its high-lift cam 17 on a cam follower 5, which is a rocking lever (see also FIG. 2).
  • the cam follower 5 acts on the gas exchange valve (inlet valve) 20 assigned to this one end.
  • the cam group 3 is closed at its outer end 6 by a separate bottom 8, soft acts on the camshaft 2 coaxial pin 15 of an electromagnetic actuator 7 in the camshaft direction. Both figures reveal an axially extended position of the cam group 3, in which it is spaced with its bottom 8 from the end face 4 of the camshaft 2 and thus projects beyond the camshaft 2 in sections.
  • the said extended position is accomplished via the force of a compression spring 10 (helical compression spring) in the de-energized state of the actuator 7 at Nockengrund réelle bevier.
  • the compression spring 10 acts at one end against an inner side 9 of the bottom 8 of the cam group 3 and the other end against the end face 4 of the camshaft 2, more precisely, it sits in a pocket 19 of the end face 4.
  • the extended position is limited by the actuator 7.
  • the cam group 3 In its axially retracted, not shown position, the cam group 3 is located on an inner side 9 whose bottom 8 on the end face 4 of the camshaft 2 (see Figure 2).

Abstract

The invention relates to a sliding cam valve train (1), comprising a cam shaft (2), on which merely that cam group (3) which is directly adjacent to an end (4) of the camshaft (2) proceeds in a rotationally fixed and axially movable manner, wherein the cam group (3) is associated with a cam follower (5) and can be acted upon in an axial direction by means of an actuator (7), which is arranged before the outer end (6) of the cam group in alignment. The sliding cam valve train (1) is suitable especially for a multi-valve DOHC one-cylinder engine, which can be found in motorcycles, mopeds, and small devices.

Description

Schiebenockenventiltrieb  Sliding cam valve train
Die Erfindung betrifft einen Schiebenockenventiltrieb für eine Viertakt-Hubkolben- Brennkraftmaschine, mit einer Nockenwelle, auf der drehfest und axial beweglich eine Nockengruppe verläuft, welche wenigstens einem Nockenfolger zugeordnet und durch einen Aktor in zumindest eine Axialrichtung beaufschlagbar ist. The invention relates to a sliding cam valve drive for a four-stroke reciprocating internal combustion engine, with a camshaft on which rotatably and axially movable cam group runs, which is assigned at least one cam follower and acted upon by an actuator in at least one axial direction.
Schiebenockenventiltriebe sind im Serieneinsatz und bspw. in der Zeitschrift„auto mo- tor und sport", Heft 19, 2008, Rubrik„technik profi" beschrieben. Jede Einlaßnockenwelle trägt hierbei drei Doppelnockengruppen, welche von insgesamt 6 elektromagnetischen Aktoren durch Stifteingriff beaufschlagbar sind. Sliding cam valve gears are described in series production and, for example, in the magazine "auto motor und sport", issue 19, 2008, section "technik profi". Each intake camshaft carries here three double cam groups, which can be acted upon by a total of 6 electromagnetic actuators by pin engagement.
Der konstruktive Aufwand sowie die Kosten pro Zylinder des vorgenannten variablen Ventiltriebs, sind, trotz der unbestrittenen verbrennungsmotorischen Vorteile, vergleichsweise hoch. Eine Übertragung dieser Technik, bspw. auf Einzylinder-Low-Cost- Motorrad- oder Kleingerätemotoren, kommt nicht infrage. The design effort and the cost per cylinder of the aforementioned variable valve train are, despite the undisputed internal combustion engine advantages, comparatively high. A transfer of this technique, for example. On single-cylinder low-cost motorcycle or small-scale engine, is out of the question.
Aufgabe ist es daher, einen einfach aufgebauten, äußerst preiswerten Schiebenockenventiltrieb zu entwickeln. Task is therefore to develop a simple design, very inexpensive sliding cam valve drive.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass auf der Nockenwelle nur diejenige Nockengruppe drehfest und axial beweglich verläuft, welche Nockengruppe an zumindest eine Stirnseite der Nockenwelle unmittelbar angrenzt, wobei diese äußere Nockengruppe durch einen ihrer Außenstirn fluchtend vorgelagerten Aktor in zumindest eine Axialrichtung beaufschlagbar ist. According to the invention, this object is achieved in that on the camshaft only that cam group rotatably and axially movable, which cam group directly adjacent to at least one end face of the camshaft, said outer cam group is acted upon by one of its outer end aligned upstream actuator in at least one axial direction.
Besonders bevorzugt, jedoch nicht ausschließlich, ist der neuartige Schiebenockenventiltrieb für einen Mehrventil-DOHC-Einzylinder-Motor vorgesehen, wobei lediglich nur eine stirnseitige Nockengruppe an vorzugsweise einer der beiden Nockenwellen (Einlassnockenwelle bspw.) vorgesehen ist. Der weitere Einlassnocken ist als Standardnocken dargestellt, so dass dessen zugeordnetes Gaswechselventil keine Hubvariabilität erfährt. Somit ist dem Fachmann eine Lösung an die Hand gegeben, mittels welcher er bei den eingangs zitierten Low-Cost-Brennkraftmaschinen mit geringem Aufwand, wenig Kosten und ohne die Umgebungskonstruktion aufwändig ändern zu müssen, eine gewisse Variabilität im Ventiltrieb zur teilweisen Entdrosselung erzielen kann. Particularly preferably, but not exclusively, the novel sliding cam valve drive is provided for a multi-valve DOHC single-cylinder engine, wherein only one end-side cam group is provided on preferably one of the two camshafts (intake camshaft, for example). The further inlet cam is shown as a standard cam, so that its associated gas exchange valve experiences no Hubvariabilität. Thus, the expert is given a solution to the hand, by means of which he has to change at the outset quoted low-cost internal combustion engines with little effort, little cost and without the surrounding construction consuming a certain variability in the valve train for partial Entdrosselung.
Der Schutzbereich der Erfindung bezieht sich selbstverständlich auch auf SOHC- Motoren oder solche mit mehr als einem Zylinder, bspw. auch 3- oder 4- Zylindermotoren. Of course, the scope of the invention also applies to SOHC engines or those with more than one cylinder, for example also 3- or 4-cylinder engines.
Als Nockenfolger kommen insbesondere hebelartige Bauteile wie Schwing-, Schleppoder Kipphebel infrage. Jedoch ist auch an Tassen-, Rollen- oder Pilzstößel gedacht; entsprechenden Bauraum vorausgesetzt. As a cam follower in particular lever-like components such as swing, drag or rocker arm come into question. However, it is also thought of cup, roll or mushroom pestles; assuming appropriate space.
Der stirnseitig fluchtend zur Nockenwelle vorgelagerte Aktor kann bspw. elektromagnetischer Bauart sein und im bestromten Zustand über dessen Pin die lediglich eine Nockengruppe in Nockenwellenrichtung verlagern und dort entgegen Druckfederkraft halten. Hierbei kann die Nockengruppe über ihren Niedrighubnocken in Kontakt zum Gegenläufer sein. Eine Rückstellung der über den Aktor verlagerten Nockengruppe von der Nockenwelle weg ist über die o. g. Druckfeder wie eine Schraubendruckfeder vorgeschlagen. Anstelle des o. g. elektromagnetischen Aktors sind auch hydraulische Aktoren etc. denkbar und vorgesehen. The frontally aligned to the camshaft upstream actuator can, for example, be of electromagnetic design and in the energized state via the pin which displace only one cam group in the camshaft direction and hold there against compression spring force. In this case, the cam group can be in contact with the counter-rotor via its low-lift cam. A provision of the displaced via the actuator cam group away from the camshaft is about the o. G. Compression spring proposed as a helical compression spring. Instead of the o. G. Electromagnetic actuator and hydraulic actuators, etc. are conceivable and provided.
Die Verstell kräfte in einer Nockengrundkreisphase sind in beide Richtungen vergleichsweise gering, da ein mechanischer Spielausgleich vorgesehen ist, bei welchem ein Spiel der Nockengruppe bei deren Grundkreisdurchlauf zum Nockenfolger vorliegt. Eine ungewollte Verlagerung der Nockengruppe während eines Kontakts deren Hubflanken ist nahezu ausgeschlossen, könnte jedoch durch eine entsprechende Rastierung (Kugelraste usw.) definitiv verhindert werden. The adjusting forces in a Nockengrundkreisphase are comparatively low in both directions, since a mechanical clearance compensation is provided, in which there is a game of cam group in the base circle passage to the cam follower. An unwanted displacement of the cam group during a contact whose lifting edges is almost impossible, but could definitely be prevented by a corresponding detent (ball catch, etc.).
Um die topfartige Nockengruppe, welche bspw. aus einem 2-er oder 3-er Nockenpaket besteht, einfach herstellen zu können, ist es vorgeschlagen, deren Boden aus ei- nem separaten Bauteil wie einer Scheibe darzustellen, welche nachträglich bspw. über einen Pressverband oder ein Gewinde mit einer Bohrung der Nockengruppe oder deren Stirnseite verbunden ist. In order to be able to produce the pot-like cam group, which for example consists of a 2 or 3 cam package, it is proposed that its bottom be made of a nem separate component such as a disc represent, which is subsequently connected, for example. Via a press fit or a thread with a bore of the cam group or the end face.
Eine simple Verdrehsicherung der Nockengruppe auf der Nockenwelle ist Gegenstand eines weiteren Unteranspruchs. Demnach sollen die Bohrung der Nockengruppe und ein Außenmantel der Nockenwelle bspw. über miteinander in Eingriff befindliche Flachs verfügen. Denkbar und vorgesehen ist jedoch auch eine Passverzahnung auf der Nockenwelle, welche mit einem entsprechenden Gegenprofil der Nockengruppe in Eingriff ist. A simple rotation of the cam group on the camshaft is the subject of another subclaim. Accordingly, the bore of the cam group and an outer shell of the camshaft, for example, should have inter-engaged flax. Conceivable and provided, however, is a spline on the camshaft, which is in engagement with a corresponding counter-profile of the cam group.
Zur Zeichnung: To the drawing:
• Figur 1 zeigt eine räumliche Ansicht eines Schiebenockenventiltriebs und  FIG. 1 shows a three-dimensional view of a sliding cam valve drive and
• Figur 2 zeigt eine Teilansicht der Nockenwelle des Schiebenockenventiltriebs mit Nockengruppe im Längsschnitt. FIG. 2 shows a partial view of the camshaft of the sliding cam valve drive with cam group in longitudinal section.
Dargestellt ist in Fig. 1 ein Schiebenockenventiltrieb 1 für einen Mehrventil-DOHC- Einzylinder-Motor (zwei gleichwirkende Einlass- und Auslassventile (20, -)). Shown in Fig. 1 is a sliding cam valve driver 1 for a multi-valve DOHC single-cylinder engine (two equivalent intake and exhaust valves (20, -)).
Der Schiebenockenventiltrieb 1 umfasst eine kurzbauende Nockenwelle 2 (hier Einlassnockenwelle), auf welcher links gezeichnet eine drehfeste und axial bewegliche Nockengruppe 3 mit einem Kleinhubnocken 16 und einem daran einstückig angeschlossenen Großhubnocken 17 verläuft. Rechts der Nockengruppe 3 ist ein Standardnocken 18 dargestellt, dem sich in weiterer Folge ein nicht gezeichnetes Nockenwellenlager anschließt. The sliding cam valve drive 1 comprises a short-building camshaft 2 (here intake camshaft), on which left drawn a non-rotatable and axially movable cam group 3 with a small stroke cam 16 and a Großhubnocken 17 integrally connected thereto. To the right of the cam group 3, a standard cam 18 is shown, which is subsequently followed by a not signed camshaft bearing.
Die Nockengruppe 3 grenzt an eine hier links dargestellte Stirnseite 4 der Nockenwelle 2 unmittelbar an und wirkt in dieser Position über Ihren Großhubnocken 17 auf einen Nockenfolger 5 ein, welcher ein Schwinghebel ist (s. a. Fig. 2). Der Nockenfolger 5 beaufschlagt das diesem einenendig zugeordnete Gaswechselventil (Einlaßventil) 20. The cam group 3 directly adjoins an end face 4 of the camshaft 2 shown here on the left and, in this position, acts on its high-lift cam 17 on a cam follower 5, which is a rocking lever (see also FIG. 2). The cam follower 5 acts on the gas exchange valve (inlet valve) 20 assigned to this one end.
Die Nockengruppe 3 ist an ihrer Außenstirn 6 durch einen separaten Boden 8 verschlossen, auf weichen ein zur Nockenwelle 2 koaxialer Stift 15 eines elektromagnetischen Aktors 7 in Nockenwellenrichtung einwirkt. Beide Figuren offenbaren eine axial ausgefahrene Stellung der Nockengruppe 3, in welcher diese mit ihrem Boden 8 von der Stirnseite 4 der Nockenwelle 2 beabstandet ist und somit die Nockenwelle 2 abschnittsweise überragt. The cam group 3 is closed at its outer end 6 by a separate bottom 8, soft acts on the camshaft 2 coaxial pin 15 of an electromagnetic actuator 7 in the camshaft direction. Both figures reveal an axially extended position of the cam group 3, in which it is spaced with its bottom 8 from the end face 4 of the camshaft 2 and thus projects beyond the camshaft 2 in sections.
Die genannte Ausfahrstellung ist über die Kraft einer Druckfeder 10 (Schraubendruckfeder) im unbestromten Zustand des Aktors 7 bei Nockengrundkreisdurchlauf bewerkstelligt. Die Druckfeder 10 agiert einenends gegen eine Innenseite 9 des Bodens 8 der Nockengruppe 3 und anderenends gegen die Stirnseite 4 der Nockenwelle 2, genauer gesagt sitzt sie hierfür in einer Tasche 19 der Stirnseite 4. Die Ausfahrstellung ist durch den Aktor 7 begrenzt. The said extended position is accomplished via the force of a compression spring 10 (helical compression spring) in the de-energized state of the actuator 7 at Nockengrundkreisdurchlauf. The compression spring 10 acts at one end against an inner side 9 of the bottom 8 of the cam group 3 and the other end against the end face 4 of the camshaft 2, more precisely, it sits in a pocket 19 of the end face 4. The extended position is limited by the actuator 7.
In ihrer axial eingefahrenen, nicht dargestellten Position liegt die Nockengruppe 3 über eine Innenseite 9 deren Bodens 8 an der Stirnseite 4 der Nockenwelle 2 an (s. Figur 2). In its axially retracted, not shown position, the cam group 3 is located on an inner side 9 whose bottom 8 on the end face 4 of the camshaft 2 (see Figure 2).
Zwischen einer Bohrung 1 1 der Nockengruppe 3 und einem Außenmantel 12 der Nockenwelle 2 sind Schlüsselflächen 13, 14 miteinander in Kontakt. Hierüber ist die verdrehfeste Verbindung der Nockengruppe 3 auf der Nockenwelle 2 realisiert. Between a bore 1 1 of the cam group 3 and an outer shell 12 of the camshaft 2 are key surfaces 13, 14 in contact. Over this the rotational connection of the cam group 3 on the camshaft 2 is realized.
Liste der Bezugszahlen ) SchiebenockenventiltnebList of reference numbers) Sliding cam valve
) Nockenwelle) Camshaft
) Nockengruppe) Cam group
) Stirnseite) Front side
) Nockenfolger) Cam follower
) Außenstirn) Outer forehead
) Aktor) Actuator
) Boden) Ground
) Innenseite ) Inside
0) Druckfeder 0) compression spring
1 ) Bohrung1) bore
2) Außenmantel2) outer jacket
3) Schlüsselfläche3) key area
4) Schlüsselfläche4) key area
5) Stift5) pen
6) Kleinhubnocken6) small lift cams
7) Großhubnocken7) Big lift cams
8) Standardnocken8) Standard cams
9) Tasche9) bag
0) Gaswechselventil, Einlassventil 0) Gas exchange valve, inlet valve

Claims

Patentansprüche claims
1 . Schiebenockenventiltrieb (1 ) für eine Viertakt-Hubkolben-Brennkraftmaschine, mit einer Nockenwelle (2), auf welcher Nockenwelle (2) lediglich diejenige Nockengruppe (3) drehfest und axial beweglich verläuft, welche Nockengruppe (3) an zumindest eine Stirnseite (4) der Nockenwelle (2) unmittelbar angrenzt, wobei die Nockengruppe (3) wenigstens einem Nockenfolger (5) zugeordnet und durch einen ihrer Außenstirn (6) fluchtend vorgelagerten Aktor (7) in zumindest eine Axialrichtung beaufschlagbar ist. 1 . Sliding cam valve drive (1) for a four-stroke reciprocating internal combustion engine, with a camshaft (2) on which camshaft (2) only that cam group (3) rotatably and axially movable, which cam group (3) on at least one end face (4) Camshaft (2) immediately adjacent, wherein the cam group (3) associated with at least one cam follower (5) and by one of its outer end (6) in alignment upstream actuator (7) can be acted upon in at least one axial direction.
2. Schiebenockenventiltrieb nach Anspruch 1 , wobei die Außenstirn (6) der Nockengruppe (3) durch einen Boden (8) verschlossen ist, so dass der Nockengruppe (3) eine topfartige Ausbildung immanent ist, wobei die Nockengruppe (3) in ihrer axial eingefahrenen Verschiebeposition über eine Innenseite (9) deren Bodens (8) an der Stirnseite (4) der Nockenwelle (2) anliegt und wobei die Nockengruppe (3) in ihrer axial ausgefahrenen Verschiebeposition die Stirnseite (4) der Nockenwelle (2) abschnittsweise überragt und über den Aktor (7) wegbegrenzt ist. 2. sliding cam valve drive according to claim 1, wherein the outer end (6) of the cam group (3) by a bottom (8) is closed, so that the cam group (3) is a cup-like design immanent, wherein the cam group (3) in its axially retracted Displacement position on an inner side (9) whose bottom (8) on the front side (4) of the camshaft (2) is applied and wherein the cam group (3) in its axially extended displacement position, the end face (4) of the camshaft (2) projects in sections and over the actuator (7) is wegbegrenzt.
3. Schiebenockenventiltrieb nach Anspruch 2, wobei die axial eingefahrene Verschiebeposition der Nockengruppe (3) über den Aktor (7) und deren axial ausgefahrene Position über die Kraft einer Druckfeder (10) bewerkstelligt ist, welche Druckfeder (10) zumindest mittelbar einenends gegen den Boden (8) der Nockengruppe (3) und anderenends gegen die Stirnseite (4) der Nockenwelle (2) agiert. 3. sliding cam valve drive according to claim 2, wherein the axially retracted displacement position of the cam group (3) via the actuator (7) and its axially extended position on the force of a compression spring (10) is accomplished, which compression spring (10) at least indirectly at one end against the ground (8) of the cam group (3) and the other end against the end face (4) of the camshaft (2) acts.
4. Schiebenockenventiltrieb nach Anspruch 2, wobei der Boden (8) der Nockengruppe (3) ein separates Bauteil ist. 4. sliding cam valve drive according to claim 2, wherein the bottom (8) of the cam group (3) is a separate component.
5. Schiebenockenventiltneb nach Anspruch 3, wobei die Druckfeder (10) als Schraubendruckfeder oder Schraubendruckfederpaket vorliegt, welche(s) in einer Tasche (19) der Stirnseite (4) der Nockenwelle (2) sitzt. 5. Schiebenockenventiltneb according to claim 3, wherein the compression spring (10) is present as a helical compression spring or helical compression spring packet, which (s) in a pocket (19) of the end face (4) of the camshaft (2) sits.
6. Schiebenockenventiltrieb nach Anspruch 1 , wobei zwischen einer Bohrung (1 1 ) der Nockengruppe (3) und einem Außenmantel (12) der Nockenwelle (2) miteinander kommunizierende Schlüsselflächen (13, 14) oder eine Feder-Nut- Verbindung zur Darstellung der verdrehfesten Verbindung appliziert sind. 6. sliding cam valve drive according to claim 1, wherein between a bore (1 1) of the cam group (3) and an outer shell (12) of the camshaft (2) with each other communicating key surfaces (13, 14) or a tongue and groove connection for the representation of the rotationally fixed Connection are applied.
7. Schiebenockenventiltrieb nach Anspruch 1 , wobei als Aktor (7) eine elektromagnetische Stellvorrichtung vorgesehen ist, welche über einen koaxial zur Nockenwelle (2) ausfahrenden Stift (15) auf die Nockengruppe (3) einwirkt. 7. sliding cam valve drive according to claim 1, wherein as actuator (7) an electromagnetic actuator is provided, which acts via a coaxial with the camshaft (2) extending pin (15) on the cam group (3).
8. Schiebenockenventiltrieb nach Anspruch 1 , wobei der Schiebenockenventiltrieb (1 ) der Brennkraftmaschine (des Motors) aus genau nur einer stirnseitigen Nockengruppe (3) besteht, welche an einer oder beiden der Nockenwellen (2, -) eines Mehrventil-DOHC-Einzylinder-Motors sitzt. 8. sliding cam valve drive according to claim 1, wherein the sliding cam valve drive (1) of the internal combustion engine (the engine) consists of exactly only one end-side cam group (3) which on one or both of the camshafts (2, -) of a multi-valve DOHC single-cylinder engine sitting.
9. Schiebenockenventiltrieb nach Anspruch 1 , wobei der Nockenfolger (5) ein Schwinghebel ist. 9. sliding cam valve drive according to claim 1, wherein the cam follower (5) is a rocker arm.
PCT/DE2015/200530 2015-01-08 2015-12-09 Sliding cam valve train WO2016110283A1 (en)

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US2969051A (en) * 1959-10-16 1961-01-24 Phillip S Webster Variable cam timing mechanism
US3633554A (en) * 1969-07-30 1972-01-11 Nissan Motor Valve timing system of automotive internal combustion engine
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JPH0216311A (en) * 1988-06-30 1990-01-19 Suzuki Motor Co Ltd Variable valve timing device
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DE102007016977A1 (en) * 2007-04-10 2008-10-16 Bayerische Motoren Werke Aktiengesellschaft Cam-operated valve stroke function adjusting device for use during operating and/or loading condition of internal combustion engine, has adjusting unit partially arranged within hollow shaft, and sleeve movable within shaft
DE102011085706A1 (en) * 2011-11-03 2013-05-08 Schaeffler Technologies AG & Co. KG Valve train for multi-cylinder combustion engine of motorcycle, has position unit whose actuator pins radially extend to cam shaft, where outer jacket surface of portion of actuator pins engage at guide surfaces

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US2969051A (en) * 1959-10-16 1961-01-24 Phillip S Webster Variable cam timing mechanism
US3633554A (en) * 1969-07-30 1972-01-11 Nissan Motor Valve timing system of automotive internal combustion engine
GB2190140A (en) * 1986-05-01 1987-11-11 Chris Walters Valve lift mechanism
JPH0216311A (en) * 1988-06-30 1990-01-19 Suzuki Motor Co Ltd Variable valve timing device
US20040134454A1 (en) * 2002-12-24 2004-07-15 Suzuki Motor Corporation Valve driving apparatus and internal combustion engine including the same

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