EP0071972B1 - Method and device for adjusting the valve drive of an internal-combustion engine, especially a diesel engine - Google Patents

Method and device for adjusting the valve drive of an internal-combustion engine, especially a diesel engine Download PDF

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Publication number
EP0071972B1
EP0071972B1 EP82107024A EP82107024A EP0071972B1 EP 0071972 B1 EP0071972 B1 EP 0071972B1 EP 82107024 A EP82107024 A EP 82107024A EP 82107024 A EP82107024 A EP 82107024A EP 0071972 B1 EP0071972 B1 EP 0071972B1
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EP
European Patent Office
Prior art keywords
camshaft
crankshaft
timing
transmission member
section
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.)
Expired
Application number
EP82107024A
Other languages
German (de)
French (fr)
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EP0071972A3 (en
EP0071972A2 (en
Inventor
Hans-Harald Dr. Ing. Melzer
Joachim Hahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to AT82107024T priority Critical patent/ATE16036T1/en
Publication of EP0071972A2 publication Critical patent/EP0071972A2/en
Publication of EP0071972A3 publication Critical patent/EP0071972A3/en
Application granted granted Critical
Publication of EP0071972B1 publication Critical patent/EP0071972B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—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
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • 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
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20—SOHC [Single overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49302—Repairing, converting, servicing or salvaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble

Definitions

  • the invention relates to a method and a device for adjusting the valve control of a reciprocating piston internal combustion engine according to the preamble of claim 1.
  • the camshaft For adjusting the control in diesel engines, it is known to provide the camshaft at the end facing away from the drive wheel with a slot directed in the longitudinal direction of the camshaft for positive engagement of the device.
  • the arrangement of the slot serving as a square for the device is such that the slot is parallel to the plane of the separating surface of the control chamber housing from the control chamber cover for adjusting the camshaft with the cam rotational position assigned to the reference cylinder.
  • the device is formed from a section of a flat material and interacts via its broad sides with the slot or the square.
  • the device When the device is engaged on the camshaft, there is a gap between the separating surface of the control chamber housing and the adjacent broad side of the device.
  • the device For exact adjustment of the camshaft, the device must be aligned parallel to the parting surface with the interposition of feeler gauges on both sides of the camshaft (VAG repair guide / diesel engine, January '80 edition, page 9).
  • the invention is based on the object of simplifying the method for setting the control in a reciprocating piston internal combustion engine and for this purpose specifying a device with which a maximum degree of setting accuracy is achieved.
  • the advantage of the invention lies essentially in the fact that in the case of a device which can be positively engaged with the camshaft in the direction transverse to the plane of the separating surface (s), the latter rests directly on the separating surface and thus, apart from cleaning the separating surface in the area of the overlying device, no further manipulations are required to align the device.
  • the mechanical locking means that the crankshaft is held exactly in the TDC position, which means that the transmission element acts as an auxiliary device when the tensioning roller acts while the drive wheel is being screwed to the camshaft, and an additional counter-holder acting on the drive wheel is not required.
  • the key cross-section formed as a square on the outer circumference of the camshaft can expediently be arranged near the screwing point of the camshaft and drive wheel and can also be produced inexpensively by two parallel surfaces on a thrust collar of the camshaft.
  • this double square in conjunction with the device arranged according to the invention braced against separating surfaces ensures a maximum degree of setting accuracy in the control of a reciprocating piston internal combustion engine, in particular a highly compressed diesel engine with TDC minimal tolerances between the piston crown and valve plates.
  • a drive wheel 4 can be connected to a camshaft 1 via a cone 2 and a central screw 3.
  • the drive wheel 4 is in drive connection via a toothed belt 5 with a wheel 6 on the crankshaft 7. 8 with an injection pump wheel and 9 with a tensioning roller.
  • Another wheel 10 of an auxiliary unit is driven via the multiple V-Prof 11 on the outside of the toothed belt 5.
  • the piston 13 is brought into TDC in the reference cylinder I of the diesel engine 12. In this position, the crankshaft 7 is secured against rotation by a flywheel 14 against the crankcase 16 by means of a setting pin 15.
  • the device 23 comprises an element 24 formed from flat material and arranged in an edgewise manner, with stop surfaces 28 and 28 'formed in both end regions 25 and 26 on a long side 27 and a U-shaped recess 29 arranged in between on the long side 27 the recess 29 is brought into engagement with the square 22 arranged transversely to the plane of the separating surfaces 30, 30 'of the control chamber housing 31 on the camshaft 1. Due to the square 22 arranged transversely to the plane of the separating surfaces 30, 30 ′ on the camshaft 1, the device 23 strikes the separating surfaces 30, 30 ′ at the end of the positive engagement with the stop surfaces 28, 28 ′, with a sufficiently deep recess 29 a clearance up to the limit of the start collar 21 is achieved.
  • the device 23 is fixed to the control housing 31 by means of a spreading device 33 which engages on clamping claws 32, 32 ′.
  • the camshaft 1 can also be kept in front of the drive wheel 4 by a corresponding angle in the direction of rotation in order to compensate for an infeed slump of the toothed belt 5.
  • This angular provision is expediently effected via the arrangement of the recess 29.
  • the toothed belt 5 is finally placed on the drive wheel 4, which is rotatably held on the cone 2 of the camshaft 1 by means of the slightly loosened central screw 3, and adjusted to the tension required during operation by means of the tensioning roller 9.
  • the drive wheel 4 is thus rotationally fixed via the toothed belt 5 and the rotationally blocked crankshaft 7 (by means of a setting pin 15) relative to the camshaft 1 which is secured against rotation by the device 23 for the final screw connection for a drive-proof frictional engagement with the cone 2 of the camshaft 1.
  • the square is an example of a key cross-section formed on the inside or outside of the camshaft.
  • the basic setting of the valve control can also be checked.

Landscapes

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

Abstract

An apparatus for the adjustment of the valve control of a reciprocating piston internal combustion engine with a cam shaft driven from the crankshaft by an endless, flexible transmission member, in which the cam shaft and a valve control adjustment device are brought into engagement with each other by a control member arranged transversely to the plane of the separating surface of a control space housing with a loosened threaded connection; the driving gear is nonrotatably fixed with respect to the cam shaft by way of the transmission member drivingly connected with the crankshaft and tensioned by a tensioning roller while the crankshaft is nonrotatably fixed in the top dead center position with respect to the crankcase by a locking pin.

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Einstellen der Ventilsteuerung einer Hubkolben-Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method and a device for adjusting the valve control of a reciprocating piston internal combustion engine according to the preamble of claim 1.

Es ist zum Einstellen der Steuerung bei Dieselmotoren bekannt, die Nockenwelle an dem dem Antriebsrad abgewandten Ende mit einem in Längserstreckung der Nockenwelle gerichteten Schlitz zum formschlüssigen Eingriff der Vorrichtung zu versehen. Die Anordnung des als Zweikant für die Vorrichtung dienenden Schlitzes ist so getroffen, daß zum Einstellen der Nockenwelle mit dem Referenzzylinder zugeordneter Nockendrehlage der Schlitz parallel zur Ebene der Trennfläche des Steuerraumgehäuses zum Steuerraumdeckel ist.For adjusting the control in diesel engines, it is known to provide the camshaft at the end facing away from the drive wheel with a slot directed in the longitudinal direction of the camshaft for positive engagement of the device. The arrangement of the slot serving as a square for the device is such that the slot is parallel to the plane of the separating surface of the control chamber housing from the control chamber cover for adjusting the camshaft with the cam rotational position assigned to the reference cylinder.

Die Vorrichtung ist aus einem Abschnitt eines Flachmaterials gebildet und wirkt über seine Breitseiten mit dem Schlitz bzw. dem Zweikant zusammen. Bei an der Nockenwelle in Eingriff gebrachter Vorrichtung ergibt sich zwischen der Trennfläche des Steuerraumgehäuses und der benachbarten Breitseite des Vorrichtung ein Spalt. Zur exakten Einstellung der Nockenwelle ist die Vorrichtung unter Zwischenlage von Fühlerlehren beiderseits der Nockenwelle zur Trennfläche parallel auszurichten (VAG-Reparaturleitfaden/Dieselmotor, Ausgabe Januar '80, Seite 9).The device is formed from a section of a flat material and interacts via its broad sides with the slot or the square. When the device is engaged on the camshaft, there is a gap between the separating surface of the control chamber housing and the adjacent broad side of the device. For exact adjustment of the camshaft, the device must be aligned parallel to the parting surface with the interposition of feeler gauges on both sides of the camshaft (VAG repair guide / diesel engine, January '80 edition, page 9).

Bei dem bekannten Einstellverfahren ist das Ausmitteln der Vorrichtung in parallele Lage durch die zusätzlichen Fühlerlehren arbeitsaufwendig, da durch die Toleranzen im Abstand der Nockenwellen-Drehachse zur Trennfläche bzw. deren Ebene verschiedene Fühlerlehren erforderlich sind. Weiter ist eine ungenaue Einstellung der Nockenwelle gegeben bei unterschiedlich weit von Mitte Nockenwelle zwischen Vorrichtung und Trennfläche angeordneten Fühlerlehren während der Verschraubung des Antriebsrades zum antriebsfesten Reibschluß mit der Nockenwelle. Da ferner bei diesem Einstellverfahren die Kurbelwelle lediglich durch Übereinstimmung einer Markierung am Schwungrad mit einer Bezugsmarke am Motorgehäuse in OT-Position angeordnet ist, erscheint das bekannte Einstellverfahren durch eine weitere mögliche Fehlerquelle für die Anwendung vor allem in der Serienherstellung von Dieselmotoren wenig geeignet. Bei Dieselmotoren, vor allem mit relativ hoher Verdichtung, sind im allgemeinen zwischen dem Boden des Kolbens in OT-Stellung und den Ventiltellern im Hauptbrennraum geringe Toleranzen gegeben, so daß bei ungenauer Einstellung der Steuerung durch Aufschlagen der Ventilteller auf dem Kolbenboden ein Maschinenschaden die Folge ist.In the known setting method, the centering of the device in a parallel position by the additional feeler gauges is labor-intensive, since different feeler gauges are required due to the tolerances in the distance of the camshaft axis of rotation from the separating surface or its plane. Furthermore, there is an inaccurate setting of the camshaft with feeler gauges arranged at different distances from the center of the camshaft between the device and the separating surface during the screwing of the drive wheel for a frictional engagement with the camshaft. Furthermore, since in this setting method the crankshaft is arranged in the TDC position only by matching a mark on the flywheel with a reference mark on the engine housing, the known setting method, due to another possible source of error, appears to be of little use for the application, particularly in the series production of diesel engines. In diesel engines, especially those with a relatively high compression, there are generally low tolerances between the bottom of the piston in the TDC position and the valve disks in the main combustion chamber, so that if the control is inaccurately adjusted, the machine plate will be damaged if the valve disk hits the piston crown .

Der Erfindung liegt die Aufgabe zugrunde, das Verfahren zum Einstellen der Steuerung bei einer Hubkolben-Brennkraftmaschine zu vereinfachen und hierfür eine Vorrichtung anzugeben, mit der ein Höchstmaß an Einstellgenauigkeit erzielt ist.The invention is based on the object of simplifying the method for setting the control in a reciprocating piston internal combustion engine and for this purpose specifying a device with which a maximum degree of setting accuracy is achieved.

Ausgehend von dem im Oberbegriff des Anspruchs 1 berücksichtigten Stand der Technik ist diese Aufgabe erfindungsgemäß mit den kennzeichnenden Merkmalen der Ansprüche 1 und 3 gelöst.Starting from the prior art considered in the preamble of claim 1, this object is achieved according to the invention with the characterizing features of claims 1 and 3.

Der Vorteil der Erfindung liegt wesentlich darin, daß bei einer in Richtung quer zur Ebene der Trennfläche (n) mit der Nockenwelle formschlüssig in Eingriff bringbaren Vorrichtung diese unmittelbar auf der Trennfläche aufliegt und somit außer einer Säuberung der Trennfläche im Bereich der aufliegenden Vorrichtung keine weiteren Handhabungen zum Ausrichten der Vorrichtung erforderlich sind. Weiter ist durch die mechanische Arretierung die Kurbelwelle exakt in OT-Position gehalten, wodurch das Übertragungsglied bei Wirken der Spannrolle während der Verschraubung des Antriebsrades mit der Nockenwelle als Hilfsvorrichtung dient und ein zusätzlicher, am Antriebsrad angreifender Gegenhalter entfällt.The advantage of the invention lies essentially in the fact that in the case of a device which can be positively engaged with the camshaft in the direction transverse to the plane of the separating surface (s), the latter rests directly on the separating surface and thus, apart from cleaning the separating surface in the area of the overlying device, no further manipulations are required to align the device. Furthermore, the mechanical locking means that the crankshaft is held exactly in the TDC position, which means that the transmission element acts as an auxiliary device when the tensioning roller acts while the drive wheel is being screwed to the camshaft, and an additional counter-holder acting on the drive wheel is not required.

Eine vorteilhafte Weiterentwicklung des erfindungsgemäßen Verfahrens ist mit dem Anspruch 2 erreicht. Mit der Berücksichtigung von im Einlaufbetrieb am Übertragungsglied auftretenden Änderungen erübrigt sich eine baldige nachträgliche Einstellung der Steuerung. Um bei alternativer Verwendung ein sattes Aufliegen der Vorrichtung auf der bzw. den Trennflächen zu erreichen, ist die Vorhaltung in dem mit der Nockenwelle zusammenwirkenden Abschnitt der Vorrichtung auszubilden. Eine Einstellung der Steuerung mit Vorhaltung der Nockenwelle ist insbesondere vorteilhaft bei einem NockenwellenAntrieb durch Zahnriemen mit Mehrfach-V-Profil auf der Außenseite zum Antrieb weiterer Aggregate. Mit einer Vorrichtung nach Anspruch 3 zur Durchführung des erfindungsgemäßen Verfahrens kann der als Zweikant ausgebildete Schlüsselquerschnitt am Außenumfang der Nockenwelle zweckmäßig nahe der Verschraubungsstelle von Nockenwelle und Antriebsrad angeordnet und ferner kostengünstig durch zwei parallele Flächen an einem Anlaufbund der Nockenwelle hergestellt werden. Damit ist einerseits ohne zusätzlichen Materialaufwand ein festigkeitsmäßig steifes Zweikant erzielt und andererseits sind für die exakte Einstellung nachteilige Elastizitäten in der Einstellvorrichtung vermieden. Erfolgt schließlich bei der Herstellung der Nocken einer Nockenwelle deren erforderliche Drehung über das Zweikant, ist somit über dieses Zweikant in Verbindung mit der erfindungsgemäß gegen Trennflächen verspannt angeordneten Vorrichtung ein Höchstmaß an Einstellgenauigkeit in der Steuerung einer Hubkolben-Brennkraftmaschine, insbesondere eines hochverdichteten Dieselmotors mit in OT minimalen Toleranzen zwischen Kolbenboden und Ventiltellern erzielt.An advantageous further development of the method according to the invention is achieved with claim 2. With the consideration of changes occurring in the running-in operation on the transmission element, there is no need to adjust the control system soon. In order to achieve a full contact of the device on the separating surface (s) with alternative use, provision must be made in the section of the device which interacts with the camshaft. Setting the control with provision of the camshaft is particularly advantageous in the case of a camshaft drive using toothed belts with a multi-V profile on the outside for driving further units. With a device according to claim 3 for carrying out the method according to the invention, the key cross-section formed as a square on the outer circumference of the camshaft can expediently be arranged near the screwing point of the camshaft and drive wheel and can also be produced inexpensively by two parallel surfaces on a thrust collar of the camshaft. On the one hand, this results in a stiff double-edged element that is rigid in terms of strength, and on the other hand, elasticities in the adjusting device that are disadvantageous for the exact setting are avoided. If, in the production of the cams of a camshaft, the required rotation takes place via the square, this double square in conjunction with the device arranged according to the invention braced against separating surfaces ensures a maximum degree of setting accuracy in the control of a reciprocating piston internal combustion engine, in particular a highly compressed diesel engine with TDC minimal tolerances between the piston crown and valve plates.

Verfahren und Vorrichtung nach der Erfindung sind anhand einer in der Zeichnung in

  • Figur 1 abschnittsweise dargestellten Steuerung für einen in
  • Figur 2 angedeuteten Dieselmotor beschrieben.
Method and device according to the invention are based on a in the drawing in
  • Figure 1 sectionally shown control for a in
  • Figure 2 indicated diesel engine described.

Mit einer Nockenwelle 1 ist über einen Konus 2 und einer Zentralschraube 3 ein Antriebsrad 4 verbindbar. Das Antriebsrad 4 steht über einen Zahnriemen 5 mit einem Rad 6 auf der Kurbelwelle 7 in Antriebsverbindung. Mit 8 ist ein Einspritzpumpenrad und mit 9 eine Spannrolle bezeichnet. Ein weiteres Rad 10 eines Nebenaggregates ist über das Mehrfach-V-Prof 11 an der Außenseite des Zahnriemens 5 angetrieben.A drive wheel 4 can be connected to a camshaft 1 via a cone 2 and a central screw 3. The drive wheel 4 is in drive connection via a toothed belt 5 with a wheel 6 on the crankshaft 7. 8 with an injection pump wheel and 9 with a tensioning roller. Another wheel 10 of an auxiliary unit is driven via the multiple V-Prof 11 on the outside of the toothed belt 5.

Zum Einstellen der Steuerung wird im Referenzzylinder I des Dieselmotors 12 der Kolben 13 in OT gebracht. In dieser Position ist die Kurbelwelle 7 über eine Schwungscheibe 14 durch einen Absteckdorn 15 gegen das Kurbelgehäuse 16 drehgesichert.To set the control, the piston 13 is brought into TDC in the reference cylinder I of the diesel engine 12. In this position, the crankshaft 7 is secured against rotation by a flywheel 14 against the crankcase 16 by means of a setting pin 15.

Bei Verdichtungs-OT-Stellung des Kolbens 13 sind Einlaßventil 17 und Auslaßventil 18 geschlossen, wobei die Nockenwelle 1 mit dem Referenzzylinder I zugeordneter Drehlage der Nocken 19 und 20 für die Ventile 17 und 18 angeordnet ist. Die Nockenwelle 1 ist über ein an einem Anlaufbund 21 angeordnetes Zweikant 22 durch eine Vorrichtung 23 drehgesichert, Fig. 2.In the compression TDC position of the piston 13, the inlet valve 17 and the outlet valve 18 are closed, the camshaft 1 being arranged with the rotational position of the cams 19 and 20 assigned to the reference cylinder I for the valves 17 and 18. The camshaft 1 is secured against rotation by means of a device 23 via a two-sided 22 arranged on a thrust collar 21, FIG. 2.

Die Vorrichtung 23 umfaßt ein aus Flachmaterial gebildetes, hochkant angeordnetes Element 24 mit in beiden Endbereichen 25 und 26 an einer Längsseite 27 ausgebildeten Anschlagflächen 28 und 28' und einer dazwischen an der Längsseite 27 angeordneten, U-förmigen Ausnehmung 29. Die Vorrichtung 23 wird über die Ausnehmung 29 mit dem quer zur Ebene der Trennflächen 30, 30' des Steuerraumgehäuses 31 an der Nockenwelle 1 angeordneten Zweikant 22 in Eingriff gebracht. Durch das quer zur Ebene der Trennflächen 30, 30' an der Nockenwelle 1 angeordnete Zweikant 22 schlägt die Vorrichtung 23 am Ende des formschlüssigen Eingriffes mit den Anschlagflächen 28, 28' auf den Trennflächen 30, 30' auf, wobei durch eine ausreichend tiefe Ausnehmung 29 ein Freigang bis zur Begrenzung des Anlaufbundes 21 erzielt ist. Über eine an Spannklauen 32, 32' angreifende Spreitzeinrichtung 33 ist die Vorrichtung 23 am Steuergehäuse 31 festgelegt.The device 23 comprises an element 24 formed from flat material and arranged in an edgewise manner, with stop surfaces 28 and 28 'formed in both end regions 25 and 26 on a long side 27 and a U-shaped recess 29 arranged in between on the long side 27 the recess 29 is brought into engagement with the square 22 arranged transversely to the plane of the separating surfaces 30, 30 'of the control chamber housing 31 on the camshaft 1. Due to the square 22 arranged transversely to the plane of the separating surfaces 30, 30 ′ on the camshaft 1, the device 23 strikes the separating surfaces 30, 30 ′ at the end of the positive engagement with the stop surfaces 28, 28 ′, with a sufficiently deep recess 29 a clearance up to the limit of the start collar 21 is achieved. The device 23 is fixed to the control housing 31 by means of a spreading device 33 which engages on clamping claws 32, 32 ′.

Über die Vorrichtung 23 kann die Nockenwelle 1 ferner zum Ausgleich eines Einlauf-Setzmaßes des Zahnriemens 5 durch einen entsprechenden Winkel in Drehrichtung gegenüber dem Antriebsrad 4 vorgehalten werden. Zweckmäßigerweise ist diese Winkelvorhaltung über die Anordnung der Ausnehmung 29 bewirkt.Via the device 23, the camshaft 1 can also be kept in front of the drive wheel 4 by a corresponding angle in the direction of rotation in order to compensate for an infeed slump of the toothed belt 5. This angular provision is expediently effected via the arrangement of the recess 29.

Auf das auf dem Konus 2 der Nockenwelle 1 mittels der leicht gelösten Zentralschraube 3 drehbeweglich gehaltene Antriebsrad 4 wird schließlich der Zahnriemen 5 aufgelegt und mittels der Spannrolle 9 auf die im Betrieb erforderliche Spannung eingestellt. Damit ist das Antriebsrad 4 über den Zahnriemen 5 und die drehblockierte Kurbelwelle 7 (durch Absteckdorn 15) gegenüber der durch die Vorrichtung 23 drehgesicherten Nockenwelle 1 drehfixiert zur endgültigen Verschraubung für einen antriebsfesten Reibschluß mit dem Konus 2 der Nockenwelle 1.The toothed belt 5 is finally placed on the drive wheel 4, which is rotatably held on the cone 2 of the camshaft 1 by means of the slightly loosened central screw 3, and adjusted to the tension required during operation by means of the tensioning roller 9. The drive wheel 4 is thus rotationally fixed via the toothed belt 5 and the rotationally blocked crankshaft 7 (by means of a setting pin 15) relative to the camshaft 1 which is secured against rotation by the device 23 for the final screw connection for a drive-proof frictional engagement with the cone 2 of the camshaft 1.

Das Zweikant ist ein Beispiel eines innen- oder außenflächig an der Nockenwelle ausgebildeten Schlüsselquerschnittes. Mit der Erfindung kann auch die Grundeinstellung der Ventilsteuerung kontrolliert werden.The square is an example of a key cross-section formed on the inside or outside of the camshaft. With the invention, the basic setting of the valve control can also be checked.

Claims (3)

1. A method of setting the valve-timing mechanism of an internal combustion engine with reciprocating pistons, in particular of a diesel engine,
having a camshaft (1) driven from a crankshaft (7) via an endless flexible transmission member (5), wherein
the crankshaft (7) is put in TDC (top-dead- centre) position for a reference cylinder (I),
the camshaft (1), with its cam angular position corresponding to the angular position of the crankshaft, is prevented from turning by means of a key cross-section (22) engaging with a device (23) which can be secured to a divided surface (30, 30') of the timing compartment housing (31), and
a driving wheel (4) which, when set to drive, is tightly coupled by friction to the camshaft (1), but which, during timing operations, can be rotated on the camshaft by means of a loosened screwed connection,

characterized by the fact,
that the camshaft (1) and device (23) are brought into engagement by means of a double- edged key cross-section (22) arranged transversely of the plane of the divided surface (n) (30, 30') of the timing compartment housing (31),
that the driving wheel (4), when the screwed connection is slackened, is set at a rotational angle with respect to the camshaft (1) via the transmission member (5) which is driven from the crankshaft (7) an tensioned by means of a tension roller (9), so that
the crankshaft (7) is turned and held fast in the TDC position (alignment pin 15) against the crank case (16).
2. A method according to claim 1, characterized by the fact that the camshaft (1) is advanced via the device (23) in the direction of rotation by an angle corresponding to the amount of movement of the transmission member (5) over the driving wheel (4).
3. Apparatus for carrying out the method of claims 1 or 2 characterized by
a beam-like element (24) with fixing surfaces (28, 28'), formed in one longitudinal side (27) for supporting it on the timing compartment housing,
a key cross-section (U-shaped cut-out 29) formed in the longitudinal side (27) of the element (24) to accept the corresponding key cross-section (double-edge 22) fitted to the camshaft (1), and
a fastening system (32, 32' and 33) for attaching the apparatus (23) to the timing compartment housing (31).
EP82107024A 1981-08-07 1982-08-04 Method and device for adjusting the valve drive of an internal-combustion engine, especially a diesel engine Expired EP0071972B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82107024T ATE16036T1 (en) 1981-08-07 1982-08-04 METHOD AND DEVICE FOR ADJUSTING THE VALVE TIMING OF A RECIPROCATING ENGINE, ESPECIALLY A DIESEL ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3131278 1981-08-07
DE19813131278 DE3131278A1 (en) 1981-08-07 1981-08-07 METHOD AND DEVICE FOR ADJUSTING THE VALVE CONTROL OF A PISTON PISTON COMBUSTION ENGINE, IN PARTICULAR. A DIESEL ENGINE

Publications (3)

Publication Number Publication Date
EP0071972A2 EP0071972A2 (en) 1983-02-16
EP0071972A3 EP0071972A3 (en) 1984-02-08
EP0071972B1 true EP0071972B1 (en) 1985-10-09

Family

ID=6138811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107024A Expired EP0071972B1 (en) 1981-08-07 1982-08-04 Method and device for adjusting the valve drive of an internal-combustion engine, especially a diesel engine

Country Status (5)

Country Link
US (2) US4461062A (en)
EP (1) EP0071972B1 (en)
JP (1) JPS5830407A (en)
AT (1) ATE16036T1 (en)
DE (2) DE3131278A1 (en)

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CN104329168A (en) * 2014-09-05 2015-02-04 朝柴动力科技（北京）有限公司 Engine cylinder piston upper stopping point locking mechanism

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Also Published As

Publication number Publication date
ATE16036T1 (en) 1985-10-15
DE3266839D1 (en) 1985-11-14
DE3131278A1 (en) 1983-02-24
US4570334A (en) 1986-02-18
US4461062A (en) 1984-07-24
EP0071972A3 (en) 1984-02-08
EP0071972A2 (en) 1983-02-16
JPS5830407A (en) 1983-02-22
JPS6344923B2 (en) 1988-09-07

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