EP0179323B1 - Automatic hydraulic lash-adjusting tappet - Google Patents

Automatic hydraulic lash-adjusting tappet Download PDF

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Publication number
EP0179323B1
EP0179323B1 EP85112507A EP85112507A EP0179323B1 EP 0179323 B1 EP0179323 B1 EP 0179323B1 EP 85112507 A EP85112507 A EP 85112507A EP 85112507 A EP85112507 A EP 85112507A EP 0179323 B1 EP0179323 B1 EP 0179323B1
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EP
European Patent Office
Prior art keywords
guide sleeve
housing
cylindrical guide
valve tappet
hollow cylindrical
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EP85112507A
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German (de)
French (fr)
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EP0179323A1 (en
Inventor
Georg Dr. Ing. E.H. Schaeffler
Horst Dipl.-Ing. Klug (Fh)
Wolfgang Dipl.-Ing. Mocker
Walter Dipl.-Ing. Speil
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INA Waelzlager Schaeffler OHG
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INA Waelzlager Schaeffler OHG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem

Definitions

  • the invention relates to an automatically hydraulically adjusting valve tappet, which is arranged in a guide bore of a cylinder head of an internal combustion engine and against whose one end face a control cam runs, and which, on the other hand, rests with a second end face against the end of a valve stem
  • the valve tappet consisting of two basic components consists, on the one hand, of a cup-shaped housing, which comprises a hollow cylindrical wall which is closed at one end by a bottom, against which the control cam runs from the outside, and on the other hand, of a cylindrical guide sleeve which is concentric with the hollow cylindrical wall and which is in the center of a disk part is arranged, which merges with its outer circumference into the hollow cylindrical wall of the housing, whereby an annular oil reservoir is limited between the hollow cylindrical wall and the cylindrical guide sleeve, which is defined by an outwardly leading hole tion is supplied with oil, the actual hydraulic lash adjuster being longitudinally displaceably guided in the guide sleeve, which is formed by an
  • cup tappets are known (DE-A-30 23 686).
  • the actual hydraulic play compensation element is formed by a single piston, which is arranged to be longitudinally displaceable in the guide sleeve, and which limits a pressure space with the latter.
  • the guide sleeve extends from the bottom of the housing and is either integrally formed with it or is at least connected pressure-tight.
  • the tappet components are cast or extruded parts, which has the disadvantage that the mass of the valve tappet is disadvantageously increased (DE-A-27 58 957 ).
  • cup tappets of the first-mentioned type, to which the present invention belongs have recently been used. Since one always sought small wall thicknesses in such valve tappets for reasons of reducing the moving masses, which is why the housing of these tappets was preferably formed from drawn sheet metal parts, the inner part consisting of the disk part and the guide sleeve could also have only a limited stability, which in some circumstances can be seen in Continuous operation could lead to damage or even breakage due to the oscillations and vibrations that occur.
  • the invention has for its object to provide an automatically hydraulically adjusting valve tappet, which is formed from thin-walled, in particular sheet metal parts and / or plastic parts to achieve low mass, but which has a very high stability and furthermore an additional leakage protection for the central oil reservoir, and can have a further oil reservoir concentrically surrounding the central oil reservoir.
  • the cylindrical guide sleeve and the disc part is formed as a one-piece separate component which is connected to the hollow cylindrical wall of the housing at the radially outer edge of the disc part, and whose cylindrical guide sleeve extends to the bottom of the housing and is in contact with its inner surface.
  • this simple constructional and manufacturing measure ensures that a kind of box construction is formed as a result of the mutual support, which has increased stability even when the wall thickness is significantly reduced compared to the known designs.
  • At the end of the cylindrical guide sleeve facing the bottom enters the annular sleeve from the oil reservoir into the guide sleeve and thus into the actual play compensation element can.
  • at least one oil transfer opening can be provided, which is formed in that a recess is formed on one of the two surfaces in contact with one another.
  • This recess can either be designed as an end slot on the guide sleeve or as a recess or recess in the bottom of the housing.
  • this inner part can also be designed as a one-piece plastic part which is connected by a snap connection to the hollow cylindrical wall of the housing.
  • the tappet construction according to the invention can be further increased in terms of its stability by the fact that the end of the cylindrical guide sleeve facing the bottom of the housing engages positively in a groove in the bottom.
  • the plunger shown in Figure 1 consists of the cup-shaped housing 1, which consists of the hollow cylindrical wall 2 and the bottom 3 thus integral.
  • an inner part 4 is arranged, which is formed from the disc part 5 and the cylindrical guide sleeve 6.
  • the parts 5 and 6 form an angle with one another which is greater than 90 °.
  • these two parts are firmly connected to one another by crimping.
  • additional welding, soldering or the like is possible at this point.
  • the disk part 5 lies against the circumferential groove 8 formed in the hollow cylindrical wall 2 and, on the other hand, is covered by the bead 9 formed out of the hollow cylindrical wall.
  • the cylindrical guide sleeve 6 is supported on the end against the inner surface 10 of the base 3. In this end region, the guide sleeve 6 has an enlarged inner diameter 11 in order to provide space for a plate washer 12, with which the hydraulic play compensation element 13 is secured against slipping out of the bore of the guide sleeve 6.
  • annular cavity which is delimited by the hollow cylindrical wall 2, the disk part 5, the cylindrical guide sleeve 6 and the inner surface 10 of the base 3, forms an annular oil reservoir 14, which is supplied with oil from the outside through the bore 15 arranged in the circumferential groove 8 can.
  • the hydraulic lash adjuster 13 consists of the outer piston 16, which is slidably guided in the guide sleeve 6 and, on the other hand, slidably receives the inner piston 17 with tight play.
  • the latter At its end facing the floor 3, the latter has a central oil storage space 18, which is in fluid communication with the annular oil storage space 14 by means of the recesses 19 and 20 in the inner surface 11 of the floor 3. From the central oil reservoir 18, the oil can pass through the bore 21, which can be closed by the check valve 22, into the high-pressure oil chamber 23, which is delimited by the two pistons 16 and 17. Under the action of spring 24, these two pistons are pressed apart.
  • the lower end face 25 of the outer piston 16 In the installed state, the lower end face 25 of the outer piston 16 is in contact with the end face of the stem of an engine valve, while a control cam runs against the bottom 3 from the outside.
  • valve tappet The function of such a valve tappet can be assumed to be known. Compared to the known designs, this construction is new in that. the cylindrical guide sleeve 6 extends to the inner surface 10 of the base 3 and is supported there to increase the stability. This support can be achieved in that when the cup-shaped housing 1 is assembled with the inner part 4, the latter is placed under axial prestress. However, it is also possible to add the two parts additionally at the contact point between the guide sleeve 6 and inner surface 10 to connect.
  • FIG. 2 The main difference between FIG. 2 and FIG. 1 is that the cylindrical guide sleeve 6 is widened to a larger diameter at its end region 26 facing the bottom 3, which means that in addition to the outer annular oil storage space 14 and the central oil storage space 18, an additional central annular oil storage space is provided 27 results. Even if the outer annular oil reservoir 14 were to run empty when the engine was at a standstill, the oil would be retained in the oil reservoir 18 and 27 and would be available when the engine was started. Because the two recesses 19 and 20 are arranged in the base 3 at diametrically opposite locations, the oil reservoir 18 could not run empty even when the plunger is in an inclined position.
  • the tappet according to FIG. 3 also has the feature that the cylindrical guide sleeve 6 or its end region 26 facing the floor engages in a circumferential groove 28 of the base 3, which additionally increases the stability of the entire tappet.
  • FIG. 3 shows an embodiment in which the entire inner part 34 is designed as a one-piece molded plastic part, which is connected to the hollow cylindrical wall 2 of the housing 1 by a snap connection 35.
  • This version in which a plastic part is used, not only has the advantage that this part is relatively easy to manufacture in any shape and is also of low mass, but also that it is particularly well suited to dampen vibrations and vibrations.
  • one (or both) of the recesses in the base 3 can also be replaced by a through slot 36 provided in the guide sleeve on the end face thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

Die Erfindung betrifft einen sich selbsttätig hydraulisch einstellenden Ventilstößel, der in einer Führungsbohrung eines Zylinderkopfes einer Brennkraftmaschine angeordnet ist, und gegen dessen eine Stirnfläche ein Steuernocken anläuft, und der andererseits mit einer zweiten Stirnfläche gegen das Ende eines Ventilschaftes anliegt, wobei der Ventilstößel aus zwei Grundbauteilen besteht, nämlich einerseits aus einem tassenförmigen Gehäuse, welches eine hohlzylindrische Wandung umfaßt, die am einen Ende durch einen Boden verschlossen ist, gegen welchen von außen der Steuernocken anläuft, und andererseits aus einer zu der hohlzylindrischen Wandung konzentrischen zylindrischen Führungshülse, die im Zentrum eines Scheibenteiles angeordnet ist, welches mit seinem Außenumfang in die hohlzylindrische Wandung des Gehäuses übergeht, wodurch zwischen der hohlzylindrischen Wandung und der zylindrischen Führungshülse ein ringförmiger Ölvorratsraum begrenzt ist, der durch eine nach außen führende Bohrung mit Öl versorgt ist, wobei in der Führungshülse das eigentliche hydraulische Spielausgleichselement längsverschieblich geführt ist, welches durch einen Innenkolben und einen diesen übergreifenden Außenkolben gebildet ist, die längsverschieblich ineinander geführt sind, und die miteinander einen Ölhochdruckraum begrenzen, der durch eine durch ein Rückschlagventil verschlossene Bohrung im Innenkolben mit einem zentrischen Ölvorratsraum verbunden ist, der im Innenkolben angeordnet und einerseits durch die Wandung des Innenkolbens und andererseits durch die Innenfläche des Bodens des Gehäuses begrenzt ist, gegen welchen der Innenkolben stirnseitig anliegt, während der Außenkolben längsverschieblich in der zylindrischen Führungshülse gelagert ist, und mit seinem geschlossenen Ende gegen das Ende des Ventilschaftes anliegt.The invention relates to an automatically hydraulically adjusting valve tappet, which is arranged in a guide bore of a cylinder head of an internal combustion engine and against whose one end face a control cam runs, and which, on the other hand, rests with a second end face against the end of a valve stem, the valve tappet consisting of two basic components consists, on the one hand, of a cup-shaped housing, which comprises a hollow cylindrical wall which is closed at one end by a bottom, against which the control cam runs from the outside, and on the other hand, of a cylindrical guide sleeve which is concentric with the hollow cylindrical wall and which is in the center of a disk part is arranged, which merges with its outer circumference into the hollow cylindrical wall of the housing, whereby an annular oil reservoir is limited between the hollow cylindrical wall and the cylindrical guide sleeve, which is defined by an outwardly leading hole tion is supplied with oil, the actual hydraulic lash adjuster being longitudinally displaceably guided in the guide sleeve, which is formed by an inner piston and an overlapping outer piston which are longitudinally displaceable one inside the other, and which together define a high-pressure oil chamber, which is closed by a check valve Bore in the inner piston is connected to a central oil reservoir, which is arranged in the inner piston and is limited on the one hand by the wall of the inner piston and on the other hand by the inner surface of the bottom of the housing, against which the inner piston rests on the end face, while the outer piston is mounted in a longitudinally displaceable manner in the cylindrical guide sleeve , and with its closed end against the end of the valve stem.

Derartige, sogenannte Tassenstößel sind bekannt (DE-A-30 23 686).Such, so-called cup tappets are known (DE-A-30 23 686).

Neben dieser Gattung von Tassenstößeln ist eine andere bekannt geworden, die auf den ersten Blick in ihrem konstruktiven Aufbau einfacher erscheint, die jedoch unter gewissen Einbaubedingungen funktionelle Nachteile besitzt. Bei dieser zweiten Gattung wird das eigentliche hydraulische Spielausgleichselement durch einen einzigen Kolben gebildet, der längsverschieblich in der Führungshülse angeordnet ist, und mit dieser einen Druckraum begrenzt. Um dies zu ermöglichen, ist es erforderlich, daß die Führungshülse vom Boden des Gehäuses ausgeht und mit diesem entweder einstückig ausgebildet oder doch wenigstens druckdicht verbunden ist. Um in diesen Fällen ein ausreichend stabiles Gehäuse erreichen zu können, ist es notwendig, die Stößelbauteile als Guß- oder Fließpreßteile auszubilden, was den Nachteil nach sich zieht, daß die Masse des Ventilstößels in nachteiliger Weise erhöht wird (DE-A-27 58 957).In addition to this type of tappet, another has become known, which at first glance appears to be simpler in terms of its construction, but which has functional disadvantages under certain installation conditions. In this second category, the actual hydraulic play compensation element is formed by a single piston, which is arranged to be longitudinally displaceable in the guide sleeve, and which limits a pressure space with the latter. To make this possible, it is necessary that the guide sleeve extends from the bottom of the housing and is either integrally formed with it or is at least connected pressure-tight. In order to be able to achieve a sufficiently stable housing in these cases, it is necessary to design the tappet components as cast or extruded parts, which has the disadvantage that the mass of the valve tappet is disadvantageously increased (DE-A-27 58 957 ).

Um die erwähnten Funktionensnachteile zu umgehen, wendet man in letzter Zeit bevorzugt Tassenstößel der erstgenannten Gattung an, der auch die vorliegende Erfindung angehört. Da man bei derartigen Ventilstößeln aus Gründen der Verringerung der bewegten Massen stets kleine Wanddicken anstrebte, weshalb man die Gehäuse dieser Stößel vorzugsweise aus gezogenen Blechteilen bildete, konnte das aus dem Scheibenteil und der Führungshülse bestehende Innenteil auch nur eine begrenzte Stabilität aufweisen, was unter Umständen im Dauerbetrieb aufgrund der auftretenden Schwingungen und Vibrationen zu Beschädigungen oder sogar Brüchen führen konnte. Um derartigen Stößeln eine erhöhte mechanische Steifheit zu geben, hat man sie auch bereits aus Fließpreß- oder Gußteilen gebildet, was jedoch wiederum den Nachteil nach sich zieht, daß dadurch ihre Masse vergrößert wird, was allseits bekannte Nachteile im Betrieb nach sich zieht (EP-A 00 30 781, Figur 3). Man ging sogar soweit, ein hydraulisches Spielausgleichselement, wie es bei der erstgenannten Stößelgattung verwendet wird, in ein Gehäuse der zweiten Stößelgattung einzusetzen, was dazu führte, daß eine nochmalige Erhöhung der bewegten Massen in Kauf genommen werden mußte. Eine solche Ausführung konnte in der Praxis nicht zu befriedigenden Ergebnissen führen (EP-A 00 30 781, Figur 8).In order to avoid the disadvantages mentioned above, cup tappets of the first-mentioned type, to which the present invention belongs, have recently been used. Since one always sought small wall thicknesses in such valve tappets for reasons of reducing the moving masses, which is why the housing of these tappets was preferably formed from drawn sheet metal parts, the inner part consisting of the disk part and the guide sleeve could also have only a limited stability, which in some circumstances can be seen in Continuous operation could lead to damage or even breakage due to the oscillations and vibrations that occur. In order to give such plungers increased mechanical stiffness, they have also already been formed from extruded or cast parts, but this in turn has the disadvantage that their mass is increased, which results in well-known disadvantages in operation (EP- A 00 30 781, Figure 3). One even went so far as to insert a hydraulic lash adjuster, as used in the first type of tappet, into a housing of the second type of tappet, which meant that a further increase in the moving masses had to be accepted. Such an implementation could not lead to satisfactory results in practice (EP-A 00 30 781, Figure 8).

Der Erfindung liegt die Aufgabe zugrunde, einen sich selbsttätig hydraulisch einstellenden Ventilstößel zu schaffen, der zur Erzielung geringer Masse aus dünnwandigen, insbesondere aus Blech gezogenen Metallteilen und/oder Kunststoffteilen gebildet ist, der dabei jedoch eine sehr hohe Stabilität besitzt und der weiterhin eine zusätzliche Auslaufsicherung für den zentrischen Ölvorratsraum besitzt, sowie einen weiteren, den zentrischen Ölvorratsraum konzentrisch umgebenden Ölvorratsraum aufweisen kann.The invention has for its object to provide an automatically hydraulically adjusting valve tappet, which is formed from thin-walled, in particular sheet metal parts and / or plastic parts to achieve low mass, but which has a very high stability and furthermore an additional leakage protection for the central oil reservoir, and can have a further oil reservoir concentrically surrounding the central oil reservoir.

Diese. Aufgabe wird nach der Erfindung dadurch gelöst, daß die zylindrische Führungshülse und das Scheibenteil als einstückiges separates Bauteil ausgebildet ist, das am radial äußeren Rand des Scheibenteiles mit der hohlzylindrischen Wandung des Gehäuses verbunden ist, und dessen zylindrische Führungshülse sich bis zum Boden des Gehäuses erstreckt und in Kontakt mit dessen Innenfläche steht. Gegenüber den bekannten Stößeln wird durch diese konstruktiv und fertigungsmäßig einfache Maßnahme erreicht, daß infolge des sich gegenseitigen Abstützens eine Art Kastenkonstruktion gebildet wird, die selbst bei gegenüber den bekannten Ausführungen deutlich verringerter Wanddicke erhöhte Stabilität aufweist.These. Object is achieved according to the invention in that the cylindrical guide sleeve and the disc part is formed as a one-piece separate component which is connected to the hollow cylindrical wall of the housing at the radially outer edge of the disc part, and whose cylindrical guide sleeve extends to the bottom of the housing and is in contact with its inner surface. Compared to the known plungers, this simple constructional and manufacturing measure ensures that a kind of box construction is formed as a result of the mutual support, which has increased stability even when the wall thickness is significantly reduced compared to the known designs.

Dabei muß dafür gesorgt werden, daß an dem dem Boden zugewandten Ende der zylindrischen Führungshülse Öl aus dem ringförmigen Ölvorratsraum in die Führungshülse und damit in das eigentliche Spielausgleichselement eintreten kann. Zu diesem Zweck kann in dem Bereich, in dem die zylindrische Führungshülse mit der Innenfläche des Bodens des Gehäuses in Kontakt steht, wenigstens eine Ölübertrittsöffnung vorgesehen sein, die dadurch gebildet ist, daß an einer der beiden miteinander in Kontakt stehenden Flächen eine Ausnehmung gebildet ist. Diese Ausnehmung kann entweder als ein stirnseitiger Schlitz an der Führungshülse, oder auch als eine Vertiefung bzw. Ausnehmung in dem Boden des Gehäuses ausgebildet sein.It must be ensured that oil at the end of the cylindrical guide sleeve facing the bottom enters the annular sleeve from the oil reservoir into the guide sleeve and thus into the actual play compensation element can. For this purpose, in the area in which the cylindrical guide sleeve is in contact with the inner surface of the bottom of the housing, at least one oil transfer opening can be provided, which is formed in that a recess is formed on one of the two surfaces in contact with one another. This recess can either be designed as an end slot on the guide sleeve or as a recess or recess in the bottom of the housing.

Als zweckmäßig hat es sich herausgestellt, das aus dem Scheibenteil und der zylindrischen Führungshülse bestehende Innenteil als einstückiges Blechformteil auszubilden.It has proven to be expedient to design the inner part consisting of the disk part and the cylindrical guide sleeve as a one-piece sheet metal part.

Dieses Innenteil kann jedoch auch als einstückiges Kunststoffteil ausgebildet sein, das durch eine Schnappverbindung mit der hohlzylindrischen Wandung des Gehäuses verbunden ist.However, this inner part can also be designed as a one-piece plastic part which is connected by a snap connection to the hollow cylindrical wall of the housing.

Ein zusätzlicher Vorteil stellt sich dann ein, wenn die zylindrische Führungshülse an ihrem dem Boden des Gehäuses zugewandten Ende auf einen größeren Durchmesser aufgeweitet ist. Dadurch ergibt sich ein zusätzlicher ringförmiger Ölvorratsraum, der den zentrischen, im Spielausgleichselement vorgesehenen Ölvorratsraum umgibt, der jedoch von dem äußeren ringförmigen Ölvorratsraum getrennt ist. Selbst wenn im Stillstand des Motors dieser äußere ringförmige ÖIvorratsraum leerlaufen sollte, würde sich in dem durch die Aufweitung der Führungshülse ergebenden zusätzlichen Ölvorratraum ein vergrößerter Ölvorrat für den Anlauf des Motors bereithalten, wodurch mit Sicherheit das Auftreten von Klappergeräuschen in der Anlaufphase vermieden würde.An additional advantage arises when the cylindrical guide sleeve is widened to a larger diameter at its end facing the bottom of the housing. This results in an additional annular oil storage space, which surrounds the central oil storage space provided in the play compensation element, but which is separate from the outer annular oil storage space. Even if this outer annular oil reservoir were to run empty when the engine was at a standstill, an enlarged oil reservoir would be available in the additional oil reservoir resulting from the widening of the guide sleeve for starting the engine, which would certainly prevent the occurrence of rattling noises during the startup phase.

Bei der Anwendung dieser Maßnahme ist es zusätzlich zweckmäßig, an der Innenfläche des Bodens zwei getrennte Ausnehmungen vorzusehen, die zum Ölübertritt dienen, und von denen sich die eine im Bereich der Kontaktstelle der zylindrischen Führungshülse und die andere im Bereich der Kontaktstelle des innenkolbens mit dem Boden befindet, und wobei die beiden Ausnehmungen einander diametral gegenüberliegen. Durch diese Maßnahme wird auch bei geneigter Einbaulage des Ventilstößels vermieden, daß aus dem zentrischen Ölvorratsraum im Spielausgleichselement im Stillstand Öl auslaufen kann, weil nämlich stets eine der beiden hintereinandergeschalteten Öiübertrittsöffnungen an einer hohen Stelle liegt, und damit das Auslaufen des Öles verhindert.When using this measure, it is additionally expedient to provide two separate recesses on the inner surface of the base, which are used for oil transfer, one of which is in the area of the contact point of the cylindrical guide sleeve and the other in the area of the contact point of the inner piston with the floor is located, and wherein the two recesses are diametrically opposite one another. With this measure, even when the valve tappet is installed in an inclined position, oil can escape from the central oil reservoir in the play compensation element at a standstill, because one of the two oil transfer openings connected in series is always at a high point and thus prevents the oil from escaping.

Die erfindungsgemäße Stößelkonstruktion kann bezüglich ihrer Stabilität noch dadurch weiter gesteigert werden, daß das dem Boden des Gehäuses zugekehrte Ende der zylindrischen Führungshülse formschlüssig in eine Nut des Bodens eingreift.The tappet construction according to the invention can be further increased in terms of its stability by the fact that the end of the cylindrical guide sleeve facing the bottom of the housing engages positively in a groove in the bottom.

In den Zeichnungen sind jeweils Längsschnitte durch unterschiedliche Stößelausführungen dargestellt.In the drawings, longitudinal sections through different plunger designs are shown.

Der in Figur 1 dargestellte Stößel besteht aus dem tassenförmigen Gehäuse 1, welches aus der hohlzylindrischen Wandung 2 und dem damit einstückigen Boden 3 besteht. In diesem Gehäuse ist ein Innenteil 4 angeordnet, welches aus dem Scheibenteil 5 und der zylindrischen Führungshülse 6 gebildet ist. Die Teile 5 und 6 bilden miteinander einen Winkel, der größer als 90° ist. An der Kontaktstelle 7 zwischen dem Außenumfang des Scheibenteiles 1 und der hohlzylindrischen Wandung 2 sind diese beiden Teile durch Einbördeln fest miteinander verbunden. Um eine flüssigkeitsdichte Verbindung zu erzielen, ist an dieser Stelle eine zusätzliche Schweißung, Lötung oder dergleichen möglich. Das Scheibenteil 5 legt sich zum Zwecke der Verbindung gegen die in die hohlzylindrische Wandung 2 eingeformte Umfangsrille 8 und wird andererseits von der aus der hohlzylindrischen Wandung herausgeformten Wulst 9 überdeckt.The plunger shown in Figure 1 consists of the cup-shaped housing 1, which consists of the hollow cylindrical wall 2 and the bottom 3 thus integral. In this housing an inner part 4 is arranged, which is formed from the disc part 5 and the cylindrical guide sleeve 6. The parts 5 and 6 form an angle with one another which is greater than 90 °. At the contact point 7 between the outer periphery of the disk part 1 and the hollow cylindrical wall 2, these two parts are firmly connected to one another by crimping. In order to achieve a liquid-tight connection, additional welding, soldering or the like is possible at this point. For the purpose of connection, the disk part 5 lies against the circumferential groove 8 formed in the hollow cylindrical wall 2 and, on the other hand, is covered by the bead 9 formed out of the hollow cylindrical wall.

Die zylindrische Führungshülse 6 stützt sich stirnseitig gegen die Innenfläche 10 des Bodens 3 ab. In diesem Endbereich weist die Führungshülse 6 einen vergrößerten Innendurchmesser 11 auf, um dort einer Tellerscheibe 12 Platz zu geben, mit welcher das hydraulische Spielausgleichselement 13 gegen Herausrutschen aus der Bohrung der Führungshülse 6 gesichert ist.The cylindrical guide sleeve 6 is supported on the end against the inner surface 10 of the base 3. In this end region, the guide sleeve 6 has an enlarged inner diameter 11 in order to provide space for a plate washer 12, with which the hydraulic play compensation element 13 is secured against slipping out of the bore of the guide sleeve 6.

Der ringförmige Hohlraum, der begrenzt ist von der hohlzylindrischen Wandung 2, dem Scheibenteil 5, der zylindrischen Führungshülse 6 und der Innenfläche 10 des Bodens 3 bildet einen ringförmigen Ölvorratsraum 14, der durch die in der Umfangsrille 8 angeordnete Bohrung 15 von außen mit Öl versorgt werden kann.The annular cavity, which is delimited by the hollow cylindrical wall 2, the disk part 5, the cylindrical guide sleeve 6 and the inner surface 10 of the base 3, forms an annular oil reservoir 14, which is supplied with oil from the outside through the bore 15 arranged in the circumferential groove 8 can.

Das hydraulische Spielausgleichselement 13 besteht aus dem Außenkolben 16, der gleitend in der Führungshülse 6 geführt ist, und der andererseits wiederum gleitend und mit engem Spiel den Innenkolben 17 aufnimmt. Dieser weist an seinem dem Boden 3 zugewandten Ende einen zentrischen Ölvorratsraum 18 auf, welcher mittels der Ausnehmungen 19 und 20 in der Innenfläche 11 des Bodens 3 in Flüssigkeitsverbindung mit dem ringförmigen Ölvorratsräum 14 steht. Aus dem zentrischen Ölvorratsraum 18 kann das Öl über die Bohrung 21, die durch das Rückschlagventil 22 verschließbar ist, in den Ölhochdruckraum 23 gelangen, der von den beiden Kolben 16 und 17 begrenzt ist. Unter Wirkung der Feder 24 werden diese beiden Kolben auseinandergedrückt. Die untere Stirnfläche 25 des Außenkolbens 16 steht im eingebauten Zustand in Kontakt mit der Stirnfläche des Schaftes eines Motorventils, während von außen gegen den Boden 3 ein Steuernocken anläuft.The hydraulic lash adjuster 13 consists of the outer piston 16, which is slidably guided in the guide sleeve 6 and, on the other hand, slidably receives the inner piston 17 with tight play. At its end facing the floor 3, the latter has a central oil storage space 18, which is in fluid communication with the annular oil storage space 14 by means of the recesses 19 and 20 in the inner surface 11 of the floor 3. From the central oil reservoir 18, the oil can pass through the bore 21, which can be closed by the check valve 22, into the high-pressure oil chamber 23, which is delimited by the two pistons 16 and 17. Under the action of spring 24, these two pistons are pressed apart. In the installed state, the lower end face 25 of the outer piston 16 is in contact with the end face of the stem of an engine valve, while a control cam runs against the bottom 3 from the outside.

Die Funktion eines derartigen Ventilstößels darf als bekannt vorausgesetzt werden. Gegenüber den bekannten Ausführungen ist bei dieser Konstruktion neu, daß. sich die zylindrische Führungshülse 6 bis zur Innenfläche 10 des Bodens 3 erstreckt und sich dort zur Erhöhung der Stabilität abstützt. Dieses Abstützen kann dadurch erreicht werden, daß beim Zusammenbau des tassenförmigen Gehäuses 1 mit dem Innenteil 4 das letztere unter axiale Vorspannung gesetzt wird. Es ist jedoch auch möglich, die beiden Teile zusätzlich an der Kontaktstelle zwischen Führungshülse 6 und Innenfläche 10 miteinander zu verbinden.The function of such a valve tappet can be assumed to be known. Compared to the known designs, this construction is new in that. the cylindrical guide sleeve 6 extends to the inner surface 10 of the base 3 and is supported there to increase the stability. This support can be achieved in that when the cup-shaped housing 1 is assembled with the inner part 4, the latter is placed under axial prestress. However, it is also possible to add the two parts additionally at the contact point between the guide sleeve 6 and inner surface 10 to connect.

Der wesentliche Unterschied der Figur 2 gegenüber Figur 1 besteht darin, daß die zylindrische Führungshülse 6 an ihrem dem Boden 3 zugewandten Endbereich 26 auf einen größeren Durchmesser aufgeweitet ist, wodurch sich neben dem äußeren ringförmigen Ölvorratsraum 14 und dem zentrischen Ölvorratsraum 18 ein zusätzlicher mittlerer ringförmiger Ölvorratsraum 27 ergibt. Selbst wenn im Stillstand des Motors der äußere ringförmige Ölvorratsraum 14 leerlaufen sollte, würde das Öl in den Ölvorratsräumen 18 und 27 zurückgehalten werden und stünde beim Anlauf des Motors zur Verfügung. Dadurch, daß die beiden Ausnehmungen 19 und 20 im Boden 3 an einander diametral gegenüberliegenden Stellen angeordnet sind, könnte der Ölvorratsraum 18 selbst bei geneigter Einbaulage des Stößels nicht leerlaufen. Als weitere Besonderheit weist der Stößel nach Figur 3 noch das Merkmal auf, daß die zylindrische Führungshülse 6 bzw. ihr dem Boden zugewandter Endbereich 26 in eine Umfangsnut 28 des Bodens 3 eingreift, was zusätzlich die Stabilität des gesamten Stößels vergrößert.The main difference between FIG. 2 and FIG. 1 is that the cylindrical guide sleeve 6 is widened to a larger diameter at its end region 26 facing the bottom 3, which means that in addition to the outer annular oil storage space 14 and the central oil storage space 18, an additional central annular oil storage space is provided 27 results. Even if the outer annular oil reservoir 14 were to run empty when the engine was at a standstill, the oil would be retained in the oil reservoir 18 and 27 and would be available when the engine was started. Because the two recesses 19 and 20 are arranged in the base 3 at diametrically opposite locations, the oil reservoir 18 could not run empty even when the plunger is in an inclined position. As a further special feature, the tappet according to FIG. 3 also has the feature that the cylindrical guide sleeve 6 or its end region 26 facing the floor engages in a circumferential groove 28 of the base 3, which additionally increases the stability of the entire tappet.

In Figur 3 ist eine Ausführung gezeigt, bei welcher das gesamte Innenteil 34 als ein einstückiges Kunststofformteil ausgebildet ist, weiches durch eine Schnappverbindung 35 mit der hohlzylindrischen Wandung 2 des Gehäuses 1 verbunden ist.FIG. 3 shows an embodiment in which the entire inner part 34 is designed as a one-piece molded plastic part, which is connected to the hollow cylindrical wall 2 of the housing 1 by a snap connection 35.

Diese Ausführung, bei der ein Kunststoffteil verwendet wird, hat nicht nur den Vorteil, daß dieses Teil in beliebiger Form relativ einfach herstellbar und dabei außerdem von geringer Masse ist, sondern auch daß es besonders gut geeignet sind, um auftretende Schwingungen und Vibrationen zu dämpfen.This version, in which a plastic part is used, not only has the advantage that this part is relatively easy to manufacture in any shape and is also of low mass, but also that it is particularly well suited to dampen vibrations and vibrations.

Wie die Figur 3 zeigt, kann zum Zwecke der Ölzuführung auch die eine (oder auch beide) Ausnehmungen im Boden 3 durch einen in der Führungshülse an deren Stirnseite vorgesehenen Durchgangsschlitz 36 ersetzt sein.As FIG. 3 shows, for the purpose of supplying oil, one (or both) of the recesses in the base 3 can also be replaced by a through slot 36 provided in the guide sleeve on the end face thereof.

Claims (7)

1. Automatically hydraulically self-adjusting valve tappet, which is arranged in a guide bore of a cylinder head of an internal combustion engine and against whose one face a control cam runs, and which bears on the other hand with a second face against the end of a valve stem, wherein the valve tappet consists of two main components, namely on the one hand of a cup-formed housing (1) which comprises a hollow cylindrical wall (2), which is closed at one end by a bottom (3), against which the control cam runs externally, and on the other hand of a cylindrical guide sleeve (6) concentric with the hollow cylindrical wall, which sleeve is arranged in the centre of a disc part (5) which runs into the hollow cylindrical wall (2) of the housing (1) at its outer periphery, whereby an annular oil reservoir (14) is delimited between the hollow cylindrical. wall (2) and the cylindrical guide sleeve (6) and is supplied with oil through a bore (15) leading to the outside, wherein the hydraulic play-compensating element proper (13) is guided longitudinally slidable in the guide sleeve, which element is formed by an inner piston (17) and an outer piston (16) engaging thereover, which are guided longitudinally slidable in each other and which together delimit an oil high pressure space (23), which is connected to a central oil reservoir (18) through a bore (21) in the inner piston (17) closed by a non-return valve (22), which reservoir is arranged in the inner piston (17) and is delimited on the one hand by the wall of the inner piston (17) and on the other hand by the inner surface (10) of the bottom (3) of the housing (1), against which the inner piston (17) bears frontally, while the outer piston (16) is mounted longitudinally slidable in the cylindrical guide sleeve (6) and bears with its closed end (25) against the end of the valve stem, characterized in that the cylindrical guide sleeve (6) and the disc part (5) are formed as a unitary, separate component, which is connected at the radially outer edge of the disc part (5) to the hollow cylindrical wall (2) of the housing (1), and whose cylindrical guide sleeve (6) extends to the bottom (3) of the housing (1) and is in contact with the inner surface (10) thereof.
2. Valve tappet according to claim 1, characterized in that in the region in which the cylindrical guide sleeve (6) is in contact with the inner surface (10) of the bottom (3) of the housing (1), at least one oil transfer opening is provided, which is so formed that it forms a recess (19) in one of the surfaces in contact with each other.
3. Valve tappet according to claim 2, characterized in that the inner part (4) is formed as a unitary sheet metal formed part.
4. Valve tappet according to claim 2, characterized in that the inner part (34) is formed as a unitary moulded plastics part, which is connected to the hollow cylindrical wall (2) of the housing (1) by a snap connection (35).
5. Valve tappet according to at least one of claims 1 to 4, characterized in that the cylindrical guide sleeve (6) is enlarged to a greater diameter (26) at its end facing the bottom (3) of the housing (1
6. Valve tappet according to claim 2, characterized in that two separate recesses (19, 20) are provided on the inner surface of the bottom, which serve for oil transfer, of which one is in the region of contact of the cylindrical guide sleeve (6, 32) and the other in the region of contact of the inner piston (17) with the bottom (3), and wherein the two recesses (19, 20) lie diametrically opposite one another.
7. Valve tappet according to at least one of claims 1 to 6, characterized in that the end of the cylindrical guide sleeve (6) facing the bottom (3) of the housing (1) engages interlocking in a groove (28) of the bottom (3).
EP85112507A 1984-10-12 1985-10-03 Automatic hydraulic lash-adjusting tappet Expired EP0179323B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3437478 1984-10-12
DE3437478A DE3437478A1 (en) 1984-10-12 1984-10-12 AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE

Publications (2)

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EP0179323A1 EP0179323A1 (en) 1986-04-30
EP0179323B1 true EP0179323B1 (en) 1989-01-11

Family

ID=6247754

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EP85112507A Expired EP0179323B1 (en) 1984-10-12 1985-10-03 Automatic hydraulic lash-adjusting tappet

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US (1) US4709668A (en)
EP (1) EP0179323B1 (en)
JP (1) JPS6196109A (en)
BR (1) BR8505066A (en)
DE (2) DE3437478A1 (en)
ES (1) ES289539Y (en)

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Also Published As

Publication number Publication date
EP0179323A1 (en) 1986-04-30
DE3437478A1 (en) 1986-04-17
US4709668A (en) 1987-12-01
ES289539Y (en) 1986-10-01
ES289539U (en) 1986-03-01
JPS6196109A (en) 1986-05-14
DE3567500D1 (en) 1989-02-16
JPH0517364B2 (en) 1993-03-09
BR8505066A (en) 1986-07-29

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