EP0386474B1 - Self-adjusting hydraulic valve tappet - Google Patents
Self-adjusting hydraulic valve tappet Download PDFInfo
- Publication number
- EP0386474B1 EP0386474B1 EP90102264A EP90102264A EP0386474B1 EP 0386474 B1 EP0386474 B1 EP 0386474B1 EP 90102264 A EP90102264 A EP 90102264A EP 90102264 A EP90102264 A EP 90102264A EP 0386474 B1 EP0386474 B1 EP 0386474B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide sleeve
- bore
- hollow cylindrical
- cylindrical wall
- valve tappet
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 3
- 230000002093 peripheral effect Effects 0.000 claims 3
- 238000007789 sealing Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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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 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 being made from a cup Housing consists, 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 ends at one end towards the bottom and at the other into the Extends the center of a disc part, which merges with its outer circumference into the hollow cylindrical wall of the housing, as a result of which an annular oil reservoir is delimited between the hollow cylindrical wall and the cylindrical guide sleeve, which axially leading bore is supplied with oil, the actual hydraulic lash adjuster being longitudinally displaceably guided in the guide sleeve, which is formed by a piston and an overlapping
- the guide sleeve is connected directly to the floor at its end facing away from the disk part. Deflections of the floor, which occur during operation when the cam runs up, are directly communicated to the guide sleeve and the disk part. As a result of the high frequency of these deflections, there is a risk that breaks may occur on the guide sleeve and / or the disk part, or that the connection of the disk part to the bore of the hollow cylindrical outer wall, which is often done by welding, is destroyed (DE-A-35 28 432).
- the invention has for its object to avoid the disadvantages while maintaining the advantages of this known construction, and in particular to ensure that occurring floor deflections have no influence on the guide sleeve and parts connected to it.
- the guide sleeve having at its end adjacent to the bottom an approximately radially outwardly directed flange which is made in one piece with it, which extends at a distance from the bottom and extends to the bore of the hollow cylindrical wall, and in that the guide sleeve is liquid-tightly connected to the pane part. In this way, the guide sleeve is safely separated from the ground, so that its deflections can no longer have any adverse effects on the guide sleeve.
- valve tappet is known in which the guide sleeve, to which the disk part is directly connected, is surrounded by a further sleeve. This works in the area of the floor additional sleeve into an outward flange.
- the use of a further sleeve on the one hand significantly increases the mass of the valve tappet, and on the other hand the completion of the hydraulically adjustable valve tappet produced as a mass product is considerably more complex.
- the flange itself can be so slightly funnel-shaped that it is only in its radially outermost region in contact with the inner surface of the bottom. It then only has contact with the floor at a point where floor deflections no longer have an effect.
- contact between the flange and the inner surface of the base can also be completely ruled out in that the flange is supported on a shoulder of the hollow cylindrical wall which is provided at a short distance from the base.
- the disc part in its center with a short collar which is directed axially towards the bottom and which receives the end of the guide sleeve. If it proves to be additionally necessary, the disk part and the guide sleeve can be connected to one another in a liquid-tight manner by welding, soldering, gluing or the like. It is also possible within the scope of the invention to connect the guide sleeve and the disk part to one another by means of an annular part made of polymeric material which receives the free ends of the guide sleeve on the one hand and the disk part on the other hand in circumferential grooves and at the same time seals liquid-tight.
- the invention also offers the variant of designing the disk part in such a way that at its radially outer edge it merges into a hollow cylindrical sleeve, which lies with its outer jacket in the bore of the hollow cylindrical wall of the cup-shaped housing, on the end face on the outer edge of the flange supports and at a circumferential point that coincides with the hole for the oil supply a longitudinal channel is deformed, which, together with the bore wall of the hollow cylindrical wall, forms a longitudinal channel, in the lower region of which the bore for the oil supply opens, and which is open at its end facing the floor towards the annular oil reservoir.
- the valve tappet shown in Figure 1 consists of the cup-shaped housing 1, which comprises the hollow cylindrical wall 2, which is closed at its upper end by the bottom 3. Inside the hollow cylindrical wall 2 and concentric to it is arranged the guide sleeve 4, which at its bottom end merges in one piece into the approximately radially directed flange 5, which in turn has a short cylindrical collar 6 axially facing away from the bottom 3 on its radially outer edge, with which it rests in the bore of the hollow cylindrical wall 2.
- the guide sleeve is fastened in the center of a disk part 7 by a weld 8.
- the disk part 7 is in turn connected to the hollow cylindrical wall 2 in a liquid-tight manner in that it is supported on the one hand on a shoulder of the wall 2 and on the other hand is held by a bead which is formed from the wall by non-cutting deformation.
- the hollow cylindrical wall 2, the disk part 7, the guide sleeve 4 and the flange 5 together delimit an annular oil reservoir 9, which is supplied with oil from the lubricating oil circuit of the internal combustion engine through a bore 10.
- the actual hydraulic lash adjuster 11 is guided in a longitudinally displaceable manner, which is formed from the inner piston 12 and the outer piston 13 spanning these, which are longitudinally displaceably guided and which together limit the oil pressure chamber 14. This is through the bore 16 closed by the check valve 15 with the central oil reservoir 17th connected in the inner piston 12.
- an inlet opening 18 is provided in the guide sleeve 4, which opens into the channel 19 extending towards the bottom, which is delimited by the lateral surface of the outer bulb 13 on the one hand and the bore of the guide sleeve 4 on the other hand.
- an oil transfer opening 20 is finally provided in the bottom 3.
- the flange 5 only has contact with the inner surface of the bottom 3 with its radially outermost region, it is ensured that deflections of the bottom 3 occurring during operation do not affect the flange 5 and thus the guide sleeve 4 and the disk part 7 can impact. This prevents damage to these parts or their mutual connections.
- FIG. 2 differs from that of Figure 1 only in that the disc part 7 has in its center a short, axially towards the bottom 3 collar 21, which receives the end of the guide sleeve 4 and also here for the liquid-tight connection a weld 8 is provided.
- the flange 5 runs exclusively radially.
- the flange 5 is supported on a shoulder 22 of the hollow cylindrical wall 2. In this way it is ensured with certainty that deflections of the base 3 cannot affect the flange.
- the connection between the guide sleeve 4 on the one hand and the disk part 7 on the other hand takes place in this embodiment by an annular part 23 made of polymeric material, which receives the free ends of the guide sleeve 4 on the one hand and the disk part 7 on the other hand in circumferential grooves and at the same time seals liquid-tight.
- FIG. 4 shows a variant of the embodiment in accordance with FIG a hollow cylindrical sleeve 24 merges, which rests with its outer jacket in the bore of the hollow cylindrical wall 2 of the cup-shaped housing 1, is supported at the end face on the outer edge of the flange 5 and at a circumferential point, which coincides with the bore 10 for the oil supply, to one Longitudinal channel 25 is deformed, which together with the bore wall 2 forms a longitudinal channel 26, in the lower region of which the bore 10 opens and which at its end facing the bottom 3 is open to the annular oil reservoir 9.
- This configuration ensures that the annular oil reservoir 9 cannot run empty when the internal combustion engine is at a standstill.
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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 betrift 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 einenends zum Boden hin und andernends bis in das Zentrum eines Scheibenteiles erstreckt, 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 hnenkolben 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 Imenkolben angeordnet und einerseits durch dessen Wandung 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, wobei an einer vom Boden entfernten Stelle vorzugsweise in der Nähe des dem Boden abgewandten Endes der Führungshülse diese eine Eintrittsöffnung aufweist, die in einen sich zum Boden hin erstreckenden Kanal mündet, der von der Mantelfläche des Außenkolbens einerseits und der Bohrung der Führungshülse andererseits begrenzt ist, sowie an dem dem Boden zugewandten Ende des Innenkolbens eine Ölübertrittsöffnung in den zentrischen Ölvorratsraum vorgesehen 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 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 being made from a cup Housing consists, 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 ends at one end towards the bottom and at the other into the Extends the center of a disc part, which merges with its outer circumference into the hollow cylindrical wall of the housing, as a result of which an annular oil reservoir is delimited between the hollow cylindrical wall and the cylindrical guide sleeve, which axially leading bore is supplied with oil, the actual hydraulic lash adjuster being longitudinally displaceably guided in the guide sleeve, which is formed by a piston and an overlapping outer piston, which are longitudinally displaceable, and which together define an oil pressure chamber which a bore in the inner piston which is closed by a check valve is connected to a central oil reservoir which is arranged in the inmen piston and is limited on the one hand by its wall 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 longitudinally displaceable in the cylindrical guide sleeve is stored, and with his closed end abuts against the end of the valve stem, at a location distant from the floor, preferably in the vicinity of the end of the guide sleeve facing away from the bottom, this has an inlet opening which opens into a channel extending towards the bottom, which on the one hand extends from the outer surface of the outer bulb and the bore of the guide sleeve is limited on the other hand, and an oil transfer opening is provided in the central oil reservoir at the end of the inner piston facing the bottom.
Bei einer bekannten derartigen Ausführung ist die Führungshülse an ihrem dem Scheibenteil abgewandten Ende direkt mit dem Boden verbunden. Durchbiegungen des Bodens, wie sie im Betrieb beim Auflaufen des Nockens auftreten, teilen sich dabei unmittelbar der Führungshülse und dem Scheibenteil mit. Infolge der hohen Frequenz dieser Durchbiegungen besteht die Gefahr, daß an der Führungshülse und/oder dem Scheibenteil Brüche auftreten können, oder daß die Verbindung des Scheibenteiles mit der Bohrung der hohlzylindrischen Außenwandung, die häufig durch Schweißen erfolgt, zerstört wird (DE-A-35 28 432).In a known embodiment of this type, the guide sleeve is connected directly to the floor at its end facing away from the disk part. Deflections of the floor, which occur during operation when the cam runs up, are directly communicated to the guide sleeve and the disk part. As a result of the high frequency of these deflections, there is a risk that breaks may occur on the guide sleeve and / or the disk part, or that the connection of the disk part to the bore of the hollow cylindrical outer wall, which is often done by welding, is destroyed (DE-A-35 28 432).
Der Erfindung liegt die Aufgabe zugrunde, bei Beibehaltung der Vorteile dieser bekannten Konstruktion deren Nachteile zu vermeiden, und insbesondere sicherzustellen, daß auftretende Bodendurchbiegungen keinen Einfluß auf die Führungshülse und mit dieser verbundene Teile ausüben können.The invention has for its object to avoid the disadvantages while maintaining the advantages of this known construction, and in particular to ensure that occurring floor deflections have no influence on the guide sleeve and parts connected to it.
Diese Aufgabe löst die Erfindung dadurch, daß die Führungshülse an ihrem dem Boden benachbarten Ende einen annähernd radial nach außen gerichteten, einteilig mit ihr ausgeführten Flansch aufweist, der im Abstand vom Boden verläuft und sich bis an die Bohrung der hohlzylindrischen Wandung erstreckt und daß die Führungshülse flüssigkeitsdicht mit dem Scheibenteil verbunden ist. Auf diese Weise ist die Führungshülse sicher vom Boden getrennt, so daß dessen Durchbiegungen keine nachteiligen Auswirkungen mehr auf die Führungshülse ausüben kann.This object is achieved by the guide sleeve having at its end adjacent to the bottom an approximately radially outwardly directed flange which is made in one piece with it, which extends at a distance from the bottom and extends to the bore of the hollow cylindrical wall, and in that the guide sleeve is liquid-tightly connected to the pane part. In this way, the guide sleeve is safely separated from the ground, so that its deflections can no longer have any adverse effects on the guide sleeve.
Aus der DE-U-88 08 711 ist ein Ventilstößel bekannt, bei welchem die Führungshülse, an die sich das Scheibenteil unmittelbar anschließt, von einer weiteren Hülse umgeben ist. Im Bereich des Bodens geht diese zusätzliche Hülse in einen nach außen gerichteten Flansch über. Durch die Verwendung einer weiteren Hülse wird zum einen die Masse des Ventilstößels deutlich erhöht, zum anderen ist die Komplettierung des als Massenerzeugnis hergestellten hydraulisch einstellbaren Ventilstößels erheblich aufwendiger.From DE-U-88 08 711 a valve tappet is known in which the guide sleeve, to which the disk part is directly connected, is surrounded by a further sleeve. This works in the area of the floor additional sleeve into an outward flange. The use of a further sleeve on the one hand significantly increases the mass of the valve tappet, and on the other hand the completion of the hydraulically adjustable valve tappet produced as a mass product is considerably more complex.
Als zweckmäßig hat es sich erwiesen, den Flansch an seinem radial äußeren Rand mit einem kurzen, axial vom Boden abgekehrten zylindrischen Kragen zu versehen, der in der Bohrung der hohlzylindrischen Wandung anliegt. Durch diese Maßnahme kann, wenn man diesen zylindrischen Kragen mit ausreichendem Übermaß in die Bohrung der hohlzylindrischen Wandung einpreßt, eine flüssigkeitsdichte Verbindung erzielt werden, ohne daß es zusätzlicher Maßnahmen, wie z. B. Schweißen bedarf.It has proven to be expedient to provide the flange on its radially outer edge with a short cylindrical collar which is axially turned away from the bottom and which lies in the bore in the hollow cylindrical wall. By this measure, if you press this cylindrical collar with a sufficient oversize into the bore of the hollow cylindrical wall, a liquid-tight connection can be achieved without additional measures, such as. B. welding is required.
Der Flansch selbst kann derart leicht trichterförmig ausgeführt sein, daß er nur in seinem radial äußersten Bereich in Kontakt mit der Innenfläche des Bodens steht. Er hat dann also nur an einer Stelle Kontakt mit dem Boden, an der sich Bodendurchbiegungen nicht mehr auswirken.The flange itself can be so slightly funnel-shaped that it is only in its radially outermost region in contact with the inner surface of the bottom. It then only has contact with the floor at a point where floor deflections no longer have an effect.
Es kann jedoch auch der Kontakt zwischen Flansch und Innenfläche des Bodens dadurch total ausgeschlossen werden, daß sich der Flansch an einem Absatz der hohlzylindrischen Wandung abstützt, der in einer geringen Entfernung vom Boden vorgesehen ist.However, contact between the flange and the inner surface of the base can also be completely ruled out in that the flange is supported on a shoulder of the hollow cylindrical wall which is provided at a short distance from the base.
Es hat sich auch als zweckmäßig erwiesen, das Scheibenteil in seinem Zentrum mit einem kurzen, axial zum Boden hin gerichteten Kragen zu versehen, welcher das Ende der Führungshülse aufnimmt. Das Scheibenteil und die Führungshülse können, wenn es sich als zusätzlich erforderlich erweist, durch Schweißen, Löten, Kleben oder dergleichen flüssigkeitsdicht miteinander verbunden werden. Es ist im Rahmen der Erfindung auch möglich, die Führungshülse und das Scheibenteil durch ein ringförmiges Teil aus polymerem Werkstoff miteinander zu verbinden, welches die freien Enden der Führungshülse einerseits und des Scheibenteiles andererseits in Umfangsnuten aufnimmt und dabei gleichzeitig flüssigkeitsdicht abdichtet.It has also proven to be expedient to provide the disc part in its center with a short collar which is directed axially towards the bottom and which receives the end of the guide sleeve. If it proves to be additionally necessary, the disk part and the guide sleeve can be connected to one another in a liquid-tight manner by welding, soldering, gluing or the like. It is also possible within the scope of the invention to connect the guide sleeve and the disk part to one another by means of an annular part made of polymeric material which receives the free ends of the guide sleeve on the one hand and the disk part on the other hand in circumferential grooves and at the same time seals liquid-tight.
Schließlich bietet die Erfindung auch noch die Variante an, das Scheibenteil so auszubilden, daß es an seinem radial äußeren Rand in eine hohlzylindrische Hülse übergeht, die mit ihrem Außenmantel in der Bohrung der hohlzylindrischen Wandung des tassenförmigen Gehäuses anliegt, sich stirnseitig am äußeren Rand des Flansches abstützt und an einer Umfangsstelle, die sich mit der Bohrung für die Ölzufuhr deckt, zu einer Längsrinne verformt ist, die zusammen mit der Bohrungswand der hohlzylindrischen Wandung einen Längskanal bildet, in dessen unteren Bereich die Bohrung für die Ölzufuhr mündet, und der an seinen dem Boden zugekehrten Ende zum ringförmigen Ölvorratsraum hin offen ist.Finally, the invention also offers the variant of designing the disk part in such a way that at its radially outer edge it merges into a hollow cylindrical sleeve, which lies with its outer jacket in the bore of the hollow cylindrical wall of the cup-shaped housing, on the end face on the outer edge of the flange supports and at a circumferential point that coincides with the hole for the oil supply a longitudinal channel is deformed, which, together with the bore wall of the hollow cylindrical wall, forms a longitudinal channel, in the lower region of which the bore for the oil supply opens, and which is open at its end facing the floor towards the annular oil reservoir.
In den Zeichnungen sind vier Varianten der Erfindung im Längsschnitt dargestellt.In the drawings, four variants of the invention are shown in longitudinal section.
Der in Figur 1 dargestellte Ventilstößel besteht aus dem tassenförmigen Gehäuse 1, welches die hohlzylindrische Wandung 2 umfaßt, die an ihrem oberen Ende durch den Boden 3 verschlossen ist. Innerhalb der hohlzylindrischen Wandung 2 und konzentrisch zu ihr ist die Führungshülse 4 angeordnet, die an ihrem bodenseitigen Ende einstückig in den annähernd radial gerichteten Flansch 5 übergeht, welcher seinerseits an seinem radial äußeren Rand einen kurzen, axial vom Boden 3 abgekehrten zylindrischen Kragen 6 aufweist, mit dem er in der Bohrung der hohlzylindrischen Wandung 2 anliegt.The valve tappet shown in Figure 1 consists of the cup-
An ihrem dem Flansch 5 entgegengesetzten Ende ist die Führungshülse im Zentrum eines Scheibenteiles 7 durch eine Schweißung 8 befestigt. Das Scheibenteil 7 seinerseits ist dadurch mit der hohlzylindrischen Wandung 2 flüssigkeitsdicht verbunden, daß es sich einerseits an einem Absatz der Wandung 2 abstützt und andererseits durch eine Wulst gehalten ist, die durch spanlose Verformung aus der Wandung herausgebildet ist.At its end opposite the
Die hohlzylindrische Wandung 2, das Scheibenteil 7, die Führungshülse 4 und der Flansch 5 begrenzen zusammen einen ringförmigen Ölvorratsraum 9, der durch eine Bohrung 10 mit Öl aus dem Schmierölkreislauf der Brennkraftmaschine versorgt wird.The hollow
Innerhalb der Führungshülse 4 ist das eigentliche hydraulische Spielausgleichselement 11 längsverschieblich geführt, welches aus dem Innenkolben 12, und dem diesen übergreifenden Außenkolben 13 gebildet ist, die längsverschieblich ineinander geführt sind und die miteinander den Öldruckraum 14 begrenzen. Dieser ist durch die durch das Rückschlagventil 15 verschlossene Bohrung 16 mit dem zentrischen Ölvorratsraum 17 im Innenkolben 12 verbunden.Within the guide sleeve 4, the actual
In der Nähe des Scheibenteiles 7 ist in der Führungshülse 4 eine Eintrittsöffnung 18 vorgesehen, die in den sich zum Boden hin erstreckenden Kanal 19 mündet, der von der Mantelfläche des Außenkolbens 13 einerseits und der Bohrung der Führungshülse 4 andererseits begrenzt ist. Am Ende des Innenkolbens 12 ist schließlich im Boden 3 eine Ölübertrittsöffnung 20 vorgesehen.In the vicinity of the
Dadurch, daß bei dieser Ausführung der Flansch 5 nur mit seinem radial äußersten Bereich Kontakt mit der Innenfläche des Bodens 3 hat, ist sichergestellt, daß sich im Betrieb auftretende Durchbiegungen des Bodens 3 nicht auf den Flansch 5 und damit auf die Führungshülse 4 und das Scheibenteil 7 auswirken können. Es ist damit eine Beschädigung dieser Teile oder ihrer gegenseitigen Verbindungen ausgeschlossen.Characterized in that in this embodiment the
Die in Figur 2 dargestellte Ausführung unterscheidet sich von der nach Figur 1 lediglich dadurch, daß das Scheibenteil 7 in seinem Zentrum einen kurzen, axial zum Boden 3 hin gerichteten Kragen 21 aufweist, welcher das Ende der Führungshülse 4 aufnimmt und wobei auch hier zur flüssigkeitsdichten Verbindung eine Schweißung 8 vorgesehen ist.The embodiment shown in Figure 2 differs from that of Figure 1 only in that the
Bei der Ausführung nach Figur 3 verläuft der Flansch 5 im Gegensatz zur Figur 1 ausschließlich radial. Um einen sicheren Abstand zur Innenfläche des Bodens 3 zu gewährleisten, stützt sich in diesem Falle der Flansch 5 an einem Absatz 22 der hohlzylindrischen Wandung 2 ab. Auf diese Weise ist mit Sicherheit gewährleistet, daß sich Durchbiegungen des Bodens 3 nicht auf den Flansch auswirken können. Die Verbindung zwischen der Führungshülse 4 einerseits und dem Scheibenteil 7 andererseits erfolgt bei dieser Ausführung durch ein ringförmiges Teil 23 aus polymerem Werkstoff, welches die freien Enden der Führungshülse 4 einerseits und des Scheibenteiles 7 andererseits in Umfangsnuten aufnimmt und gleichzeitig flüssigkeitsdicht abdichtet.In the embodiment according to FIG. 3, in contrast to FIG. 1, the
In Figur 4 schließlich ist eine Variante der Ausführung nach Figur 2 dargestellt, bei der das Scheibenteil 7 an seinem radial äußeren Rand in eine hohlzylindrische Hülse 24 übergeht, die mit ihrem Außenmantel in der Bohrung der hohlzylindrischen Wandung 2 des tassenförmigen Gehäuses 1 anliegt, sich stirnseitig am äußeren Rand des Flansches 5 abstützt und an einer Umfangsstelle, die sich mit der Bohrung 10 für die Ölzufuhr deckt, zu einer Längsrinne 25 verformt ist, die zusammen mit der Bohrungswand 2 einen Längskanal 26 bildet, in dessen unteren Bereich die Bohrung 10 mündet und der an seinem dem Boden 3 zugekehrten Ende zum ringförmigen Ölvorratsraum 9 hin offen ist. Durch diese Ausbildung wird erreicht, daß der ringförmige Ölvorratsraum 9 beim Stillstand der Brennkraftmaschine nicht leerlaufen kann.Finally, FIG. 4 shows a variant of the embodiment in accordance with FIG a hollow
Claims (8)
- 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 the end of a valve stem, the valve tappet comprising a cup-shaped housing (1) which comprises a hollow cylindrical wall (2) closed at one end by a bottom (3) against which the control cam runs on the outside, and also comprises a cylindrical guide sleeve (4) concentric with the hollow cylindrical wall (2), which guide sleeve (4) extends on one end up to the bottom (3) and on the other end into the centre of a disc part (7) which at its outer periphery merges into the hollow cylindrical wall (2) of the housing (1), whereby between the hollow cylindrical wall (2) and the cylindrical guide sleeve (4) an annular oil reservoir (9) is defined which is supplied with oil through a bore (10) leading to the outside, the actual play compensating element (11) being guided for longitudinal displacement in the guide sleeve and comprising an inner piston (12) and an outer piston (13) overlapping this, the two pistons being guided for longitudinal displacement in each other and together defining an oil pressure chamber (14) which through a bore (16) in the inner piston (12) closed by a non-return valve (15) is connected to a central oil reservoir (17) arranged in the inner piston (12) and defined on the one side by the wall of the inner piston and on the other side by the inner surface of the bottom (3) of the housing (1) against which the inner piston (12) bears frontally while the other piston (13) is mounted for longitudinal displacement in the cylindrical guide sleeve (4) and bears with its closed end against the end of the valve stem, the guide sleeve (4) comprising, at a location at a distance from the bottom (3) and preferably near the end of the guide sleeve (4) facing away from the bottom (3), an inlet opening (18) which opens into a canal (19) extending up to the bottom and defined by the peripheral surface of the outer piston (13) on one side and by the bore of the guide sleeve (4) on the other side, an oil overflow opening (20) leading into the central oil reservoir (17) being provided at he end of the inner piston (12) facing the bottom (3), characterised in that the guide sleeve (4) comprises, at its end adjacent the bottom (3), an integrally formed flange (5) oriented approximately radially towards the outside which is arranged at a distance from the bottom (3) and extends up to the bore of the hollow cylindrical wall (2), and that the guide sleeve (4) is connected to the disc part (7) in a fluid-tight manner.
- Valve tappet according to claim 1, characterised in that at its radially outer edge, the flange (5) merges into a short cylindrical collar (6) facing axially away from the bottom and bearing against the bore of the hollow cylindrical wall (2).
- Valve tappet according to claim 1, characterised in that the flange (5) is made slightly funnel-shaped so that only its radially outermost region is in contact with the inner surface of the bottom (3).
- Valve tappet according to claim 1, characterised in that the flange (5) is supported on a step (22) of the hollow cylindrical wall (2) so as to have no contact with the inner surface of the bottom (3).
- Valve tappet according to claim 1,characterised in that the disc part (7) is provided at its centre with a short collar (21) which is oriented axially towards the bottom and receives the end of the guide sleeve (4).
- Valve tappet according to claim 5, characterised in that the disc part (7) and the guide (4) are joined to each other in a fluid-tight manner by welding (8), gluing or the like.
- Valve tappet according to claim 1, characterised in that the guide sleeve (4) and the disc part (7) are connected to each other by an annular member (23) of polymeric material which on one side receives the free end of the guide sleeve (4) and on the other side the free end of the disc part (7) in peripheral grooves while sealing them at the same time in a fluid-tight manner.
- Valve tappet according to claim 1, characterised in that at its radially outer edge the disc part (7) merges into a hollow cylindrical sleeve (24) whose outer peripheral surface bears against the bore of the hollow cylindrical wall (2) of the cup-shaped housing (1), is supported frontally on the outer edge of the flange (5) and, at a point on its periphery which registers with the oil supply bore (10), is formed into a longitudinal flute (25) which together with the bore wall of the hollow cylindrical wall (2) forms a longitudinal canal (26) in whose lower region the oil supply bore (10) opens and which, at its end facing the bottom (3), communicates with the annular oil reservoir (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8902780U | 1989-03-08 | ||
| DE8902780U DE8902780U1 (en) | 1989-03-08 | 1989-03-08 | Self-adjusting hydraulic valve tappet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0386474A1 EP0386474A1 (en) | 1990-09-12 |
| EP0386474B1 true EP0386474B1 (en) | 1993-06-09 |
Family
ID=6836815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90102264A Expired - Lifetime EP0386474B1 (en) | 1989-03-08 | 1990-02-06 | Self-adjusting hydraulic valve tappet |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4951619A (en) |
| EP (1) | EP0386474B1 (en) |
| JP (1) | JPH02271007A (en) |
| DE (2) | DE8902780U1 (en) |
| ES (1) | ES2041055T3 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8902780U1 (en) * | 1989-03-08 | 1989-04-20 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | Self-adjusting hydraulic valve tappet |
| US4987672A (en) * | 1989-07-28 | 1991-01-29 | Fuji Valve Co., Ltd. | Method of partitioning the internal space of a hollow cylindrical member |
| DE4005261A1 (en) * | 1990-02-20 | 1991-08-22 | Bayerische Motoren Werke Ag | IC-engine valve tappet - has hydraulic valve clearance adjuster with ring channel connecting oil supply and transfer borehole |
| DE4118776A1 (en) * | 1991-06-07 | 1992-12-10 | Schaeffler Waelzlager Kg | MECHANICAL VALVE TUNEL FOR AN INTERNAL COMBUSTION ENGINE |
| DE4124484C1 (en) * | 1991-07-24 | 1993-01-14 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
| 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 |
| DE4314619A1 (en) * | 1993-05-04 | 1994-11-10 | Schaeffler Waelzlager Kg | Pestle |
| DE4325610A1 (en) * | 1993-07-30 | 1995-02-02 | Schaeffler Waelzlager Kg | Cup-shaped valve lifter |
| DE4343876A1 (en) * | 1993-12-22 | 1995-06-29 | Schaeffler Waelzlager Kg | Valve actuator for IC engine |
| DE19602012A1 (en) * | 1996-01-20 | 1997-07-24 | Schaeffler Waelzlager Kg | Valve tappets actuated by a cam of an internal combustion engine |
| DE19603916A1 (en) * | 1996-02-03 | 1997-08-07 | Schaeffler Waelzlager Kg | Tappet for the valve train of an internal combustion engine |
| DE19630443A1 (en) * | 1996-07-27 | 1998-01-29 | Schaeffler Waelzlager Kg | Zero backlash hydraulic tappet for internal combustion engine |
| DE19724563A1 (en) * | 1997-06-11 | 1998-12-17 | Schaeffler Waelzlager Ohg | Cup-shaped valve tappet for gas exchange valve |
| US6536391B2 (en) * | 2000-12-13 | 2003-03-25 | Delphi Technologies, Inc. | Compact hydraulic lash adjuster |
| EP1536106A1 (en) * | 2000-12-13 | 2005-06-01 | Delphi Technologies, Inc. | Hydraulic lash adjuster |
| DE102020104313B3 (en) * | 2020-02-19 | 2021-01-28 | Schaeffler Technologies AG & Co. KG | Plunger for acting on a pump piston of a high-pressure fuel pump |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590898A (en) * | 1979-12-05 | 1986-05-27 | Eaton Corporation | Hydraulic tappet for direct-acting valve gear |
| DE3006644A1 (en) * | 1980-02-22 | 1981-09-03 | Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt | VALVE TOWEL FOR INTERNAL COMBUSTION ENGINES WITH OVERHEAD CAMSHAFT |
| JPS60157907U (en) * | 1984-03-28 | 1985-10-21 | アイシン精機株式会社 | Direct hydraulic lifter |
| DE3437478A1 (en) * | 1984-10-12 | 1986-04-17 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE3500425A1 (en) * | 1985-01-09 | 1986-07-10 | Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt | HYDRAULIC CUPS FOR COMBUSTION ENGINES |
| JPH0746723Y2 (en) * | 1985-06-20 | 1995-10-25 | 日産自動車株式会社 | Hydraulic valve lifter |
| DE3542192A1 (en) * | 1985-11-29 | 1987-06-04 | Schaeffler Waelzlager Kg | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE3617858A1 (en) * | 1986-05-27 | 1987-12-03 | Freudenberg Carl Fa | MUG PESTLE |
| DE3637906A1 (en) * | 1986-11-06 | 1988-05-19 | Schaeffler Waelzlager Kg | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE8808711U1 (en) * | 1988-03-26 | 1988-08-25 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | Self-adjusting hydraulic valve tappet |
| DE3810436A1 (en) * | 1988-03-26 | 1989-10-12 | Schaeffler Waelzlager Kg | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE8902780U1 (en) * | 1989-03-08 | 1989-04-20 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | Self-adjusting hydraulic valve tappet |
-
1989
- 1989-03-08 DE DE8902780U patent/DE8902780U1/en not_active Expired
-
1990
- 1990-01-31 US US07/472,722 patent/US4951619A/en not_active Expired - Fee Related
- 1990-02-06 ES ES199090102264T patent/ES2041055T3/en not_active Expired - Fee Related
- 1990-02-06 EP EP90102264A patent/EP0386474B1/en not_active Expired - Lifetime
- 1990-02-06 DE DE9090102264T patent/DE59001639D1/en not_active Expired - Fee Related
- 1990-03-05 JP JP2051934A patent/JPH02271007A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0573887B2 (en) | 1993-10-15 |
| DE8902780U1 (en) | 1989-04-20 |
| EP0386474A1 (en) | 1990-09-12 |
| JPH02271007A (en) | 1990-11-06 |
| ES2041055T3 (en) | 1993-11-01 |
| US4951619A (en) | 1990-08-28 |
| DE59001639D1 (en) | 1993-07-15 |
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