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EP0212162B1 - Automatic hydraulic lash-adjusting tappet - Google Patents

Automatic hydraulic lash-adjusting tappet Download PDF

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Publication number
EP0212162B1
EP0212162B1 EP86108970A EP86108970A EP0212162B1 EP 0212162 B1 EP0212162 B1 EP 0212162B1 EP 86108970 A EP86108970 A EP 86108970A EP 86108970 A EP86108970 A EP 86108970A EP 0212162 B1 EP0212162 B1 EP 0212162B1
Authority
EP
European Patent Office
Prior art keywords
guide sleeve
inner piston
oil
bore
piston
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 - Lifetime
Application number
EP86108970A
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German (de)
French (fr)
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EP0212162A1 (en
Inventor
Walter Dipl.-Ing. Speil
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Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
Original Assignee
Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
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Publication of EP0212162A1 publication Critical patent/EP0212162A1/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
    • 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 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 a cup-shaped housing exists, 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 which has a cylindrical guide sleeve concentric to the hollow cylindrical wall, which extends from the bottom to the center of a Disc part extends, which merges with its outer circumference into the hollow cylindrical wall of the housing, the disc part and the guide sleeve being connected to one another in a liquid-tight manner, as a result of which between the hollow cylindrical wall and the cylindrical F an annular oil reservoir is limited, which is supplied with oil through a bore leading to the outside, the actual hydraulic lash adjuster being guided in the guide sleeve, which is
  • valve lifters are e.g. known from EP-A 0 030 781.
  • oil is transferred from the outer annular oil storage space into the annular space - and from there into the central oil storage space arranged in the inner piston - at a location that is arranged at a short distance from the bottom of the tappet.
  • the outer annular oil reservoir is only partially filled with oil, or at least contains a - albeit small - portion of air. If the oil present in the central oil reservoir is needed to fill up the high-pressure chamber when the engine is started, the air located in the outer annular oil reservoir at the upper end will be sucked into the central oil reservoir.
  • the invention has for its object to ensure by simple constructional measures that air settling at the upper end of the outer annular oil reservoir cannot be sucked into the central oil reservoir.
  • the invention solves this problem in that the inlet opening is located in the vicinity of the end of the guide sleeve facing away from the floor and opens into a longitudinal groove extending over a relatively small part of the circumference of the guide sleeve, which is arranged in the bore of the guide sleeve, towards the floor extends there and passes over the annular space into the oil transfer opening.
  • the plunger shown in Fig. 1 consists of the cup-shaped housing 1, which consists of the hollow cylindrical wall 2 and the bottom 3 integral therewith.
  • this housing an inner part 4 is arranged, which is formed from the disc part 5 and the cylindrical guide sleeve 6.
  • 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 and, on the other hand, is covered by the bead 9 formed out of the hollow cylindrical wall.
  • the cylindrical guide sleeve 6 engages on the end face in a groove in the inner surface 10 of the base 3.
  • the guide sleeve 6 has an enlarged inner diameter 11 um to give space to 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.
  • 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 supplies oil from the outside through the bore 15 arranged in the circumferential groove 8 can be.
  • the hydraulic lash adjuster 13 consists of the outer piston 16, which is slidably guided in the guide sleeve 6, and which in turn slides and receives the inner piston 17 with tight play.
  • the latter has a central oil reservoir 18, which is in fluid communication with the annular space 20 between the inner piston 17 and the guide sleeve 6 by means of the recess 19 in the inner surface 10 of the base 3.
  • an inlet opening 26 is provided in the vicinity of the end of the guide sleeve 6 facing away from the bottom 3, which opens into a longitudinal groove 27, which is arranged in the bore wall of the guide sleeve 6 and itself extends towards the bottom 3.
  • the oil from the outer annular storage space 14 thus passes through the inlet opening 26 into the longitudinal groove 27, from there into the annular space 20 and via the recess 19 into the central oil storage space 18. Air that may settle in the outer oil storage space 14 at the upper end cannot therefore get into the central oil reservoir 18.
  • the plunger design shown in FIG. 2 differs from that of FIG. 1 essentially by the different design of the outer cup-shaped housing 1.
  • the guide sleeve 28 is formed here in one piece with the base 3 and the outer oil storage space 14 is on its side facing away from the base 3 Ended by a separate disc part 29, which is caulked at its outer edge to the bore of the hollow cylindrical wall 2, and which is sealed against the end of the guide sleeve 28 by an O-ring 30 inserted therein.
  • the oil is transferred from the annular oil storage space 14 into the central oil storage space 18 through an inlet opening 31 provided in the guide sleeve 28 at its end facing away from the floor, which opens into the longitudinal groove 32 provided in the bore of the guide sleeve 28.
  • the oil passes into the annular space 33 between the inner piston 17 and the guide sleeve 28, and from there through a recess 34 provided at the front end of the inner piston 17 finally into the central oil storage space 18.

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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 einem tassenförmigen Gehäuse besteht, welches eine hohlzylindrische Wandung umfaßt, die am einen Ende durch einen Boden verschlossen ist, gegen welchen von außen der Steuernocken anläuft, und welches eine zu der hohlzylindrischen Wandung konzentrische zylindrische Führungshülse aufweist, die sich, ausgehend vom Boden, bis in das Zentrum eines Scheibenteiles erstreckt, welches mit seinem Außenumfang in die hohlzylindrische Wandung des Gehäuses übergeht, wobei das Scheibenteil und die Führungshülse flüssigkeitsdicht miteinander verbunden sind, wodurch zwischen der hohlzylindrischen Wandung und der zylindrischen Führungshülse ein ringförmiger ÖIvorratsraum begrenzt ist, der durch eine nach außen führende Bohrung mit ÖI 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 Öldruckraum 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 welche 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, und daß an dem dem Boden zugewandten Ende des Innenkolbens eine Ölübertrittsöffnung zwischen dem zentrischen Ölvorratsraum und einem zwischen dem Innenkolben und der Führungshülse gebildeten Ringraum vorgesehen ist, wobei an einer vom Boden entfernten Stelle die Führungshülse eine Eintrittsöffnung aufweist, die mit dem Ringraum verbunden ist.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 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 a cup-shaped housing exists, 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 which has a cylindrical guide sleeve concentric to the hollow cylindrical wall, which extends from the bottom to the center of a Disc part extends, which merges with its outer circumference into the hollow cylindrical wall of the housing, the disc part and the guide sleeve being connected to one another in a liquid-tight manner, as a result of which between the hollow cylindrical wall and the cylindrical F an annular oil reservoir is limited, which is supplied with oil through a bore leading to the outside, the actual hydraulic lash adjuster being guided in the guide sleeve, which is formed by an inner piston and an overlapping outer piston, which are guided in a longitudinally displaceable manner, and which together delimit an oil pressure chamber which is connected by a bore in the inner piston which is closed by a check valve to a central oil reservoir which is arranged in the inner piston and is delimited 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 rests with its closed end against the end of the valve stem, and that at the end of the inn facing the bottom enkolbens an oil transfer opening is provided between the central oil reservoir and an annular space formed between the inner piston and the guide sleeve, the guide sleeve having an inlet opening at a location remote from the bottom, which is connected to the annular space.

Derartige Ventilstößel sind z.B. aus der EP-A 0 030 781 bekannt. Bei diesen Ventilstößeln erfolgt der Ölübertritt aus dem äußeren ringförmigen ÖIvorratsraum in den Ringraum - und von dort in den im Innenkolben angeordneten zentrischen Ölvorratsraum - an einer Stelle, die in geringem Abstand vom Boden des Stößels angeordnet ist. Es ist bekannt, daß es Betriebszustände gibt, in welchen der äußere ringförmige Ölvorratsraum nur teilweise mit ÖI gefüllt ist, oder doch wenigstens einen - wenn auch geringen - Anteil an Luft enthält. Wird nun beim Ingangsetzen des Motors das im zentrischen Olvorratsraum vorhandene ÖI zur Auffüllung des Hochdruckraumes benötigt, so wird dadurch in den zentrischen Ölvorratsraum zunächst die im äußeren ringförmigen Ölvorratsraum sich am oberen Ende befindliche Luft nachgesaugt werden. Das kann dazu führen, daß dann diese, sich jetzt im zentrischen Ölvorratsraum befindliche Luft nicht schnell genug wieder aus diesem abgeführt werden kann, sondern daß sie im Verlauf der nächsten Betriebsspiele auch in den Ölhochdruckraum gelangt, was zu den bekannten nachteiligen Folgen führt. Eine Vergrößerung des Ringraumes in axialer Richtung mit dem Ziel die Eintrittsöffnung in größerem Abstand vom Boden des Stößels anzuordnen, ist wegen der damit verbundenen Dichtheitsverluste im Dichtspalt zwischen Innenkolben und Führungshülse jedoch bedenklich.Such valve lifters are e.g. known from EP-A 0 030 781. With these valve tappets, oil is transferred from the outer annular oil storage space into the annular space - and from there into the central oil storage space arranged in the inner piston - at a location that is arranged at a short distance from the bottom of the tappet. It is known that there are operating states in which the outer annular oil reservoir is only partially filled with oil, or at least contains a - albeit small - portion of air. If the oil present in the central oil reservoir is needed to fill up the high-pressure chamber when the engine is started, the air located in the outer annular oil reservoir at the upper end will be sucked into the central oil reservoir. This can lead to the fact that this air, which is now located in the central oil storage space, cannot be removed from it quickly enough, but that it also reaches the high-pressure oil space in the course of the next operating cycles, which leads to the known disadvantageous consequences. However, an enlargement of the annular space in the axial direction with the aim of arranging the inlet opening at a greater distance from the bottom of the tappet is questionable because of the associated leakage losses in the sealing gap between the inner piston and the guide sleeve.

Bei hydraulischen Tassenstößeln, bei denen ein Innenkolben direkt in einer mit dem Tassenstößelgehäuse verbundenen Führungshülse geführt wird, ist es bekannt, einen Ölknal zwischen ringförmigen und zentrischen Vorratsraum durch ein spiralförmig gebogenes Rohr (JP-A 59-87212) oder durch eine konzentrisch zum Außenmantel der Führungshülse angeordnete, ringförmige Wand zu bilden (JP-A 59-65508). Diese Maßnahmen sind bedingt durch die zusätzlich verwendeten Bauteile in der Herstellung relativ teuer und bewirken eine Vergrößerung der Masse des Tassenstößels.In hydraulic bucket tappets, in which an inner piston is guided directly in a guide sleeve connected to the bucket tappet housing, it is known to knock an oil gap between the annular and central storage space through a spirally bent tube (JP-A 59-87212) or through a concentric to the outer jacket of the Guide sleeve arranged to form an annular wall (JP-A 59-65508). These measures are relatively expensive due to the additional components used in the manufacture and cause an increase in the mass of the tappet.

Der Erfindung liegt die Aufgabe zugrunde, durch einfache konstruktive Maßnahmen sicherzustellen, daß sich am oberen Ende des äußeren ringförmigen Ölvorratsraumes absetzende Luft nicht in den zentrischen Ölvorratsraum gesaugt werden kann.The invention has for its object to ensure by simple constructional measures that air settling at the upper end of the outer annular oil reservoir cannot be sucked into the central oil reservoir.

Diese Aufgabe löst die Erfindung dadurch, daß die Eintrittsöffnung in der Nähe des dem Boden abgewandten Endes der Führungshülse liegt und in eine sich über einen relativ geringen Teilbereich des Umfanges der Führungshülse erstreckende Längsnut mündet, die in der Bohrung der Führungshülse angeordnet ist, sich zum Boden hin erstreckt und dort über den Ringraum in die Ölübertrittsöffnung übergeht.The invention solves this problem in that the inlet opening is located in the vicinity of the end of the guide sleeve facing away from the floor and opens into a longitudinal groove extending over a relatively small part of the circumference of the guide sleeve, which is arranged in the bore of the guide sleeve, towards the floor extends there and passes over the annular space into the oil transfer opening.

Zweckmäßige Ausführungsformen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous embodiments of the invention are described in the subclaims.

In den Zeichnungen ist die Erfindung anhand von zwei Längsschnitten durch unterschiedliche Stößelausführungen beispielhaft dargestellt.In the drawings, the invention is shown by way of example using two longitudinal sections through different plunger designs.

Der in Fig. 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. An der Kontaktstelle 7 zwischen dem Außenumfang des Scheibenteiles 5 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 eingeformte Umfangsrille 8 und wird andererseits von der aus der hohlzylindrischen Wandung herausgeformten Wulst 9 überdeckt.The plunger shown in Fig. 1 consists of the cup-shaped housing 1, which consists of the hollow cylindrical wall 2 and the bottom 3 integral therewith. In this housing an inner part 4 is arranged, which is formed from the disc part 5 and the cylindrical guide sleeve 6. At the contact point 7 between the outer circumference of the disk part 5 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 and, on the other hand, is covered by the bead 9 formed out of the hollow cylindrical wall.

Die zylindrische Führungshülse 6 greift stirnseitig in eine Nut in der Innenfläche 10 des Bodens 3 ein. 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 engages on the end face in a groove in the inner surface 10 of the base 3. In this end region, the guide sleeve 6 has an enlarged inner diameter 11 um to give space to 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 Hohraum, der begrenzt is 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. 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, weicher mittels der Ausnehmung 19 in der Innenfläche 10 des Bodens 3 in Flüssigkeitsverbindung mit dem Ringraum 20 zwischen Innenkolben 17 und Führungshülse 6 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 seht im eingebauten Zustand in Kontakt mit der Stirnfläche des Schaftes eines Motorventils, während von außen gegen den Boden 3 ein Steuernocken anläuft.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 supplies oil from the outside through the bore 15 arranged in the circumferential groove 8 can be. The hydraulic lash adjuster 13 consists of the outer piston 16, which is slidably guided in the guide sleeve 6, and which in turn slides and receives the inner piston 17 with tight play. At its end facing the base 3, the latter has a central oil reservoir 18, which is in fluid communication with the annular space 20 between the inner piston 17 and the guide sleeve 6 by means of the recess 19 in the inner surface 10 of the base 3. From the central oil storage space 18, the oil can pass through the bore 21, which can be closed by the check valve 22, into the high-pressure oil space 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.

Zur Uberführung des Öles aus dem äußeren ÖIvorratsraum 14 in den zentrischen Ölvorratsraum 18 ist in der Nähe des dem Boden 3 abgewandten Endes der Führungshülse 6 eine Eintrittsöffnung 26 vorgesehen, die in eine Längsnut 27 mündet, die in der Bohrungswandung der Führungshülse 6 angeordnet ist und sich in Richtung auf den Boden 3 erstreckt.To transfer the oil from the outer oil storage space 14 into the central oil storage space 18, an inlet opening 26 is provided in the vicinity of the end of the guide sleeve 6 facing away from the bottom 3, which opens into a longitudinal groove 27, which is arranged in the bore wall of the guide sleeve 6 and itself extends towards the bottom 3.

Das Öl aus dem äußeren ringförmigen Vorratsraum 14 gelangt somit über die Eintrittsöffnung 26 in die Längsnut 27, von dort in den Ringraum 20 und über die Ausnehmung 19 in den zentrischen Ölvorratsraum 18. Sich eventuell im äußeren Ölvorratsraum 14 am oberen Ende absetzende Luft kann somit nicht in den zentrischen Ölvorratsraum 18 gelangen.The oil from the outer annular storage space 14 thus passes through the inlet opening 26 into the longitudinal groove 27, from there into the annular space 20 and via the recess 19 into the central oil storage space 18. Air that may settle in the outer oil storage space 14 at the upper end cannot therefore get into the central oil reservoir 18.

Die in Fig. 2 dargestellte Stößelausführung unterscheidet sich von der nach Fig. 1 im wesentlichen durch die andersartige Gestaltung des äußeren tassenförmigen Gehäuses 1. Die Führungshülse 28 ist hier einstückig mit dem Boden 3 ausgebildet und der äußere Ölvorratsraum 14 ist an seinem dem Boden 3 abgewandten Ende durch ein separates Scheibenteil 29 abgeschlossen, welches an seinem Außenrand mit der Bohrung der hohlzylindrischen Wandung 2 verstemmt ist, und welches gegenüber dem Ende der Führungshülse 28 durch einen in diese eingesetzten O-Ring 30 abgedichtet ist.The plunger design shown in FIG. 2 differs from that of FIG. 1 essentially by the different design of the outer cup-shaped housing 1. The guide sleeve 28 is formed here in one piece with the base 3 and the outer oil storage space 14 is on its side facing away from the base 3 Ended by a separate disc part 29, which is caulked at its outer edge to the bore of the hollow cylindrical wall 2, and which is sealed against the end of the guide sleeve 28 by an O-ring 30 inserted therein.

Auch hier erfolgt der Ölübertritt aus dem ringförmigen Ölvorratsraum 14 in den zentrischen Ölvorratsraum 18 durch eine in der Führungshülse 28 an deren dem Boden abgewandten Ende vorgesehene Eintrittsöffnung 31, welche in die in der Bohrung der Führungshülse 28 vorgesehene Längsnut 32 mündet. Durch diese Längsnut gelangt das Öl in den Ringraum 33 zwischen dem Innenkolben 17 und der Führungshülse 28, und von dort durch eine am stirnseitigen Ende des Innenkolbens 17 vorgesehene Ausnehmung 34 schließlich in den zentrischen Ölvorratsraum 18.Here, too, the oil is transferred from the annular oil storage space 14 into the central oil storage space 18 through an inlet opening 31 provided in the guide sleeve 28 at its end facing away from the floor, which opens into the longitudinal groove 32 provided in the bore of the guide sleeve 28. Through this longitudinal groove, the oil passes into the annular space 33 between the inner piston 17 and the guide sleeve 28, and from there through a recess 34 provided at the front end of the inner piston 17 finally into the central oil storage space 18.

Claims (3)

1. Self-adjusting hydraulic valve tappet 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, with a second end face bears against a valve stem, the valve tappet comprising a cup-shaped housing (1) which comprises a hollow cylindrical wall (2) closed at the one end by a bottom (3) against which the control can runs on the outside, and also comprises a cylindrical guide sleeve (6, 28) concentric with the hollow cylindrical wall, which sleeve starts from the bottom (3) and extends into the centre of a disc member (5, 29) which at its outer periphery merges into the hollow cylindrical wall (2) of the housing (1), the disc member (5, 29) and the guide sleeve (6, 28) being connected to each other in a liquid-tight manner whereby between the hollow cylindrical wall (2) and the cylindrical guide sleeve (6, 28) an annular oil reservoir (14) is defined which is supplied with oil through a bore (15) leading to the outside, the actual hydraulic clearance compensation element (13) being longitudinally displaceably guided in the guide sleeve and comprising an inner piston (17) and an outer piston (16) overlapping this, the two being longitudinally displaceably guided in each other and together defining an oil pressure chamber (23) which is connected via a bore (21) in the inner piston (17) closed by a non-return valve (22), to a central oil reservoir (18) arranged in the inner piston (17) and defined on the one hand by the wall of the inner piston (17) and on the other by the inner surface (10) of the bottom (3) of the housing (1) against which the inner piston (17) bears frontally whereas the outer piston (16) is mounted longitudinally slidable in the cylindrical guide sleeve (6, 28) and bears with its closed end against the end of the valve stem, an oil transfer opening (19, 34) between the central oil reservoir (18) and an annular space (33, 20) formed between the inner piston (17) and the guide sleeve (6, 28) being provided at the end of the inner piston (17) facing the bottom (3), and the guide sleeve (6, 28) comprising, at a location at a distance from the bottom (3), an inlet opening (26, 31) which communicates with the annular space (33, 20), characterized in that the inlet opening (26, 31) is situated in the vicinity of the end of the guide sleeve (6, 28) away from the bottom (3) and opens into a longitudinal groove (27, 32) which extends over a relatively small partial region of the periphery of the guide sleeve (6, 28), is arranged in the bore of the guide sleeve (6, 28) and extends upto the bottom (3) there to merge, via the annular space (33, 20), into the oil transfer opening (19, 34).
2. Valve tappet according to claim 1, characterized in that the oil transfer opening to the central oil reservoir (18) is formed by a recess (19) in the bottom (3) registering with the contact face between inner piston (17) and inner surface (10) of the bottom (3).
3. Valve tappet according to claim 1, charaterized in that the oil transfer opening to the central oil reservoir (18) is formed by at least one recess (34) at the frontal end of the inner piston (17).
EP86108970A 1985-08-08 1986-07-02 Automatic hydraulic lash-adjusting tappet Expired - Lifetime EP0212162B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853528432 DE3528432A1 (en) 1985-08-08 1985-08-08 AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE
DE3528432 1985-08-08

Publications (2)

Publication Number Publication Date
EP0212162A1 EP0212162A1 (en) 1987-03-04
EP0212162B1 true EP0212162B1 (en) 1990-12-27

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Family Applications (1)

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EP86108970A Expired - Lifetime EP0212162B1 (en) 1985-08-08 1986-07-02 Automatic hydraulic lash-adjusting tappet

Country Status (6)

Country Link
US (1) US4745889A (en)
EP (1) EP0212162B1 (en)
JP (1) JPS6235004A (en)
BR (1) BR8603773A (en)
DE (2) DE3528432A1 (en)
ES (1) ES293880Y (en)

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JP3153091B2 (en) * 1994-03-10 2001-04-03 株式会社荏原製作所 Waste treatment method and gasification and melting and combustion equipment
DE3810436A1 (en) * 1988-03-26 1989-10-12 Schaeffler Waelzlager Kg AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE
DE3828635A1 (en) * 1988-08-24 1990-03-08 Daimler Benz Ag METHOD FOR PRODUCING CUPS FOR LIFTING PISTON MACHINES
JPH02126005U (en) * 1989-03-28 1990-10-17
IT1229355B (en) * 1989-05-23 1991-08-08 Eaton Automotive Spa HYDRAULIC TAPPETS WITH OIL CIRCULATION ALONG A 360 DEVELOPING PATH [ON TWO LEVELS.
JP2782088B2 (en) * 1989-06-02 1998-07-30 日鍛バルブ株式会社 Direct-acting hydraulic lash adjuster
JP2782087B2 (en) * 1989-06-02 1998-07-30 日鍛バルブ株式会社 Direct-acting hydraulic lash adjuster
DE4138985C2 (en) * 1990-12-07 2001-03-22 Volkswagen Ag Hydraulic length compensation device, in particular play compensation device for a lift valve
IT1251311B (en) * 1991-09-12 1995-05-08 Eaton Engine Lifters Spa HYDRAULIC TAPPET BODY WITH DIRECT CONNECTION WITH REDUCED TANK FOR OIL
US5280771A (en) * 1992-09-23 1994-01-25 Eaton Corporation Direct acting hydraulic tappet
DE4340035B4 (en) * 1992-12-10 2006-02-23 Ina-Schaeffler Kg Mechanical bucket tappet
DE4332110A1 (en) * 1993-09-22 1995-03-23 Schaeffler Waelzlager Kg Tappet with hydraulic valve clearance adjustment
US5922090A (en) 1994-03-10 1999-07-13 Ebara Corporation Method and apparatus for treating wastes by gasification
DE19733027A1 (en) * 1997-07-31 1999-02-04 Schaeffler Waelzlager Ohg Hydraulic valve play compensation system for internal combustion motor
KR100559622B1 (en) * 1999-07-30 2006-03-10 현대자동차주식회사 Hydraulic lash adjuster for decreasing noise of intake and exhaust valve
JP5081667B2 (en) * 2008-02-28 2012-11-28 カルソニックカンセイ株式会社 Gas compressor
JP7226173B2 (en) * 2019-07-30 2023-02-21 株式会社デンソー Control device for fuel injection system

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Also Published As

Publication number Publication date
US4745889A (en) 1988-05-24
JPS6235004A (en) 1987-02-16
ES293880Y (en) 1987-07-01
ES293880U (en) 1986-11-01
BR8603773A (en) 1987-03-10
DE3676587D1 (en) 1991-02-07
EP0212162A1 (en) 1987-03-04
DE3528432A1 (en) 1987-02-19
JPH0445647B2 (en) 1992-07-27

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