EP0266685B1 - Self-adjusting hydraulic valve tappet - Google Patents

Self-adjusting hydraulic valve tappet Download PDF

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Publication number
EP0266685B1
EP0266685B1 EP87115946A EP87115946A EP0266685B1 EP 0266685 B1 EP0266685 B1 EP 0266685B1 EP 87115946 A EP87115946 A EP 87115946A EP 87115946 A EP87115946 A EP 87115946A EP 0266685 B1 EP0266685 B1 EP 0266685B1
Authority
EP
European Patent Office
Prior art keywords
guide sleeve
valve tappet
disk member
cylindrical wall
hollow cylindrical
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
EP87115946A
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German (de)
French (fr)
Other versions
EP0266685A1 (en
Inventor
Georg Dr.Ing. E.H. Dipl.-Kfm. Schaeffler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager Schaeffler OHG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0266685A1 publication Critical patent/EP0266685A1/en
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Publication of EP0266685B1 publication Critical patent/EP0266685B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—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 which consists of a cup-shaped housing which comprises a hollow cylindrical wall which is closed at one end by a bottom, against which a control cam is connected from the outside starts up, and in which a concentric to the hollow cylindrical wall guide sleeve is arranged, which opens at its end facing away from the bottom in the center of a disc part, which supports the guide sleeve at least in the radial direction and with its outer circumference merges into the hollow cylindrical wall of the housing and with the wall (2) is connected, and which guide sleeve is at its other end at a distance from the floor, the actual hydraulic play compensation element being guided in a longitudinally displaceable manner in the guide sleeve.
  • valve tappets are, for example, from GB-PS 21 56 471. These essentially also meet the requirements placed on them.
  • the valve lifters are particularly required to have the lowest possible mass. This leads to designs with ever smaller wall thicknesses, which leads to vibrations in the high-frequency accelerations and decelerations that occur in operation, which under unfavorable conditions can lead to fractures and the complete destruction of the valve lifters.
  • a particularly critical point is the guide sleeve, which is connected to the cylindrical wall of the cup housing only at one end via a disk part, while it projects freely at its opposite end. If the guide sleeve and the disk part also have to be made thinner to reduce the mass of the valve tappet, this results in a critical situation from the point of view of vibration technology.
  • Cup tappets are known from EP-A 179 323 and EP-A 224 666, in which the guide sleeve is stabilized by extending the guide sleeve to the bottom of the housing and connecting the guide sleeve to the inside of the housing base.
  • these solutions are only suitable to a limited extent because, in particular, the connection to the cup base is located in a zone that is problematic in terms of vibration and the guide sleeve is not supported in the critical vibration range.
  • the invention has for its object to achieve such a stiffening of the housing with simple technical means that even with reduced wall thicknesses damage that is due to vibrations is not to be expected.
  • a second disc part which starts from the hollow cylindrical wall and additionally supports the guide sleeve at a distance from the first disc part.
  • the second disc part pass into the hollow cylindrical wall in the immediate vicinity of the first disc part, from where it extends in a funnel shape towards the bottom and nearby the bottom of the end of the guide sleeve engages it.
  • the second disc part may be useful to design the second disc part so that it merges into an axial collar at its bore, which receives the guide sleeve in its bore. It only needs to be a tight fit between the guide sleeve on the one hand and the axial collar on the other without additional fasteners being required. On the other hand, however, if necessary, it is entirely possible to firmly connect the second disk part to the guide sleeve by welding, soldering, gluing or the like.
  • Another expedient embodiment can consist in that the second disk part is formed in one piece with the guide sleeve.
  • the two disk parts can finally be arranged at a mutual distance almost at right angles to the longitudinal axis of the valve lifter and can also start in one piece from the two ends of the guide sleeve.
  • the plungers shown in the figures each consist of the cup-shaped housing 1, which is formed from the hollow cylindrical wall 2 and the base 3, which is integral therewith.
  • the guide sleeve 4 is arranged concentrically in the housing 1 and opens at its end facing away from the base 3 into the center of a first disk part 5, which in turn is connected to the hollow cylindrical wall 2.
  • the actual hydraulic play compensation element 6 is guided in a longitudinally displaceable manner in the guide sleeve 4.
  • a second disc part 7 is provided which, in the embodiments according to FIGS. 1 and 2, merges into the hollow cylindrical wall 2 in the immediate vicinity of the first disc part 5.
  • the second disc part 7 is provided at its bore with an axially directed collar 8, the inner diameter of which is so matched to the outer diameter of the guide sleeve 4 that there is a tight fit between them.
  • FIG. 2 differs from this embodiment in that the second disk part 7 is formed in one piece with the guide sleeve 4. While the first disk part 5 extends from the lower end of the guide sleeve 4, the second disk part 7 extends from the upper end of the guide sleeve 4 starting inclined outwards, where it merges into the hollow cylindrical wall 2 in the immediate vicinity of the first disk part 5.
  • FIG. 3 shows a further variant in which - similar to FIG. 2 - the first disk part 5 starts from the lower end of the guide sleeve 4 and the second disk part 7 from the upper end thereof.
  • both disk parts 5 and 7 extend outwards at right angles to the longitudinal axis of the valve tappet and merge into the hollow cylindrical wall 2 at two axially distant locations. In this way, a box-shaped construction is created which has an even higher rigidity than that previously described.
  • a bore 9 is provided in the second disc part 7, through which the two partial storage spaces, which are separated by the second disc part 7, are connected to one another.

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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 der aus einem tassenförmigen Gehäuse besteht, welches eine hohlzylindrische Wandung umfaßt, die am einen Ende durch einen Boden verschlossen ist, gegen welchen von außen ein Steuernocken anläuft, und in welchem eine zu der hohlzylindrischen Wandung konzentrische Führungshülse angeordnet ist, die an ihrem dem Boden abgewandten Ende in das Zentrum eines Scheibenteiles mündet, welches die Führungshülse wenigstens in radialer Richtung abstützt und mit seinem Außenumfang in die hohlzylindrische Wandung des Gehäuses übergeht und mit der Wandung (2) verbunden ist, und welche Führungshülse sich mit ihrem anderen Ende in einem Abstand vom Boden befindet, wobei in der Führungshülse das eigentliche hydraulische Spielausgleichselement längsverschieblich geführt 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 which consists of a cup-shaped housing which comprises a hollow cylindrical wall which is closed at one end by a bottom, against which a control cam is connected from the outside starts up, and in which a concentric to the hollow cylindrical wall guide sleeve is arranged, which opens at its end facing away from the bottom in the center of a disc part, which supports the guide sleeve at least in the radial direction and with its outer circumference merges into the hollow cylindrical wall of the housing and with the wall (2) is connected, and which guide sleeve is at its other end at a distance from the floor, the actual hydraulic play compensation element being guided in a longitudinally displaceable manner in the guide sleeve.

Derartige Ventilstößel sind beispielsweise aus der GB-PS 21 56 471. Diese erfüllen im wesentlichen auch die an sie gestellten Anforderungen. Im Zusammenhang mit der Entwicklung immer leistungsfähigerer, mit hohen Drehzahlen laufender Verbrennungsmotoren wird dabei an die Ventilstößel insbesondere die Forderung nach geringstmöglicher Masse gestellt. Dies führt zu Konstruktionen mit immer geringeren Wanddicken, was bei den im Betrieb auftretenden hochfrequenten Beschleunigungen und Verzögerungen zu Schwingungen führt, die unter ungünstigen Bedingungen zu Brüchen und zur völligen Zerstörung der Ventilstößel führen können. Ein besonders kritischer Punkt ist dabei die Führungshülse, die nur an ihrem einen Ende über ein Scheibenteil mit der zylindrischen Wandung des Tassengehäuses verbunden ist, während sie an ihrem entgegengesetzten Ende frei auskragt. Wenn zur Verringerung der Masse des Ventilstößels auch die Führungshülse und das Scheibenteil dünner ausgeführt werden müssen, ergibt sich dadurch aus schwingungstechnischer Sicht eine kritische Situation.Such valve tappets are, for example, from GB-PS 21 56 471. These essentially also meet the requirements placed on them. In connection with the development of increasingly powerful internal combustion engines that run at high speeds, the valve lifters are particularly required to have the lowest possible mass. This leads to designs with ever smaller wall thicknesses, which leads to vibrations in the high-frequency accelerations and decelerations that occur in operation, which under unfavorable conditions can lead to fractures and the complete destruction of the valve lifters. A particularly critical point is the guide sleeve, which is connected to the cylindrical wall of the cup housing only at one end via a disk part, while it projects freely at its opposite end. If the guide sleeve and the disk part also have to be made thinner to reduce the mass of the valve tappet, this results in a critical situation from the point of view of vibration technology.

Aus der EP-A 179 323 und der EP-A 224 666 sind Tassenstößel bekannt, bei denen eine Stabilisierung der Führungshülse durch Verlängerung der Führungshülse bis zum Boden des Gehäuses und eine Anbindung der Führungshülse an die Innenseite des Gehäusebodens erreicht wird. Diese Lösungen sind in der Praxis nur bedingt tauglich, weil insbesondere die Anbindung an den Tassenboden in einer schwingungstechnisch problematischen Zone liegt und eine Abstützung der Führungshülse im kritischen Schwingungsbereich nicht erfolgt.Cup tappets are known from EP-A 179 323 and EP-A 224 666, in which the guide sleeve is stabilized by extending the guide sleeve to the bottom of the housing and connecting the guide sleeve to the inside of the housing base. In practice, these solutions are only suitable to a limited extent because, in particular, the connection to the cup base is located in a zone that is problematic in terms of vibration and the guide sleeve is not supported in the critical vibration range.

Der Erfindung liegt die Aufgabe zugrunde, mit einfachen technischen Mitteln eine solche Versteifung des Gehäuses zu erreichen, daß auch bei verringerten Wanddicken nicht mit Schäden zu rechnen ist, die auf Schwingungen zurückzuführen sind.The invention has for its object to achieve such a stiffening of the housing with simple technical means that even with reduced wall thicknesses damage that is due to vibrations is not to be expected.

Diese Aufgabe löst die Erfindung dadurch, daß ein zweites Scheibenteil vorgesehen ist, welches von der hohlzylindrischen Wandung ausgeht und die Führungshülse in einem Abstand von dem ersten Scheibenteil zusätzlich abstützt. Auf diese Weise wird eine Art Kastenprofil geschaffen, welches auch bei deutlich verringerter Wandstärke eine erheblich höhere Steifigkeit aufweist, als die bisherigen Stößelkonstruktionen.This object is achieved by the invention in that a second disc part is provided which starts from the hollow cylindrical wall and additionally supports the guide sleeve at a distance from the first disc part. In this way, a type of box profile is created which, even with a significantly reduced wall thickness, has a considerably higher rigidity than the previous plunger designs.

Um bei dieser Konstruktion den äußeren ringförmigen Ölvorratsraum nicht unzulässig zu verkleinern, ist es zweckmäßig, das zweite Scheibenteil in unmittelbarer Nachbarschaft des ersten Scheibenteiles in die hohlzylindrische Wandung übergehen zu lassen, wobei es sich von dort aus trichterförmig in Richtung des Bodens erstreckt und in der Nähe des dem Boden zugewandten Endes der Führungshülse an dieser angreift.In order not to inadmissibly reduce the size of the outer annular oil storage space in this construction, it is expedient to have the second disc part pass into the hollow cylindrical wall in the immediate vicinity of the first disc part, from where it extends in a funnel shape towards the bottom and nearby the bottom of the end of the guide sleeve engages it.

Dabei kann es zweckmäßig sein, das zweite Scheibenteil so auszubilden, daß es an seiner Bohrung in einen axialen Kragen übergeht, der in seiner Bohrung die Führungshülse aufnimmt. Dabei braucht zwischen der Führungshülse einerseits und dem axialen Kragen andererseits nur ein Festsitz vorzuliegen, ohne daß es zusätzlicher Befestigungsmittel bedarf. Andererseits ist es jedoch im Bedarfsfalle durchaus möglich, das zweite Scheibenteil durch Schweißen, Löten, Kleben oder dergleichen fest mit der Führungshülse zu verbinden.It may be useful to design the second disc part so that it merges into an axial collar at its bore, which receives the guide sleeve in its bore. It only needs to be a tight fit between the guide sleeve on the one hand and the axial collar on the other without additional fasteners being required. On the other hand, however, if necessary, it is entirely possible to firmly connect the second disk part to the guide sleeve by welding, soldering, gluing or the like.

Eine weitere zweckmäßige Ausgestaltung kann darin bestehen, daß das zweite Scheibenteil einstückig mit der Führungshülse gebildet ist.Another expedient embodiment can consist in that the second disk part is formed in one piece with the guide sleeve.

Um eine noch starrere Abstützung der Führungshülse zu erreichen, können schließlich die beiden Scheibenteile im gegenseitigen Abstand nahezu rechtwinklig zur Längsachse des Ventilstößels angeordnet sein und außerdem einstückig von den beiden Enden der Führungshülse ausgehen.In order to achieve an even more rigid support of the guide sleeve, the two disk parts can finally be arranged at a mutual distance almost at right angles to the longitudinal axis of the valve lifter and can also start in one piece from the two ends of the guide sleeve.

In den beigefügten Zeichnungen sind Ausführungsbeispiele der Erfindung im Längsschnitt dargestellt.In the accompanying drawings, embodiments of the invention are shown in longitudinal section.

Die in den Figuren dargestellten Stößel bestehen jeweils aus dem tassenförmigen Gehäuse 1, welches aus der hohlzylindrischen Wandung 2 und dem damit einstückigen Boden 3 gebildet ist. Konzentrisch in dem Gehäuse 1 ist die Führungshülse 4 angeordnet, die an ihrem dem Boden 3 abgewandten Ende in das Zentrum eines ersten Scheibenteiles 5 mündet, welches seinerseits mit der hohlzylindrischen Wandung 2 verbunden ist. In der Führungshülse 4 ist das eigentliche hydraulische Spielausgleichselement 6 längsverschieblich geführt.The plungers shown in the figures each consist of the cup-shaped housing 1, which is formed from the hollow cylindrical wall 2 and the base 3, which is integral therewith. The guide sleeve 4 is arranged concentrically in the housing 1 and opens at its end facing away from the base 3 into the center of a first disk part 5, which in turn is connected to the hollow cylindrical wall 2. The actual hydraulic play compensation element 6 is guided in a longitudinally displaceable manner in the guide sleeve 4.

Zusätzlich zu dem ersten Scheibenteil 5 ist ein zweites Scheibenteil 7 vorgesehen, welches bei den Ausführungen nach den Figuren 1 und 2 in unmittelbarer Nachbarschaft des ersten Scheibenteiles 5 in die hohlzylindrische Wandung 2 übergeht.In addition to the first disc part 5, a second disc part 7 is provided which, in the embodiments according to FIGS. 1 and 2, merges into the hollow cylindrical wall 2 in the immediate vicinity of the first disc part 5.

Gemäß Figur 1 ist das zweite Scheibenteil 7 an seiner Bohrung mit einem axial gerichteten Kragen 8 versehen, dessen Innendurchmesser so auf den Außendurchmesser der Führungshülse 4 abgestimmt ist, daß zwischen diesen ein Festsitz vorhanden ist.According to Figure 1, the second disc part 7 is provided at its bore with an axially directed collar 8, the inner diameter of which is so matched to the outer diameter of the guide sleeve 4 that there is a tight fit between them.

Die Figur 2 weicht von dieser Ausführung insofern ab, als bei ihr das zweite Scheibenteil 7 einstückig mit der Führungshüse 4 gebildet ist. Während das erste Scheibenteil 5 vom unteren Ende der Führungshülse 4 ausgeht, erstreckt sich das zweite Scheibenteil 7 vom oberen Ende der Führungshülse 4 ausgehend geneigt nach außen, wo es in unmittelbarer Nachbarschaft des ersten Scheibenteiles 5 in die hohlzylindrische Wandung 2 übergeht.FIG. 2 differs from this embodiment in that the second disk part 7 is formed in one piece with the guide sleeve 4. While the first disk part 5 extends from the lower end of the guide sleeve 4, the second disk part 7 extends from the upper end of the guide sleeve 4 starting inclined outwards, where it merges into the hollow cylindrical wall 2 in the immediate vicinity of the first disk part 5.

In Figur 3 schließlich ist eine weitere Variante dargestellt, bei der - ähnlich wie in Figur 2 - das erste Scheibenteil 5 vom unteren Ende der Führungshülse 4 und das zweite Scheibenteil 7 von deren oberen Ende ausgeht. Im Unterschied zur Figur 2 erstrecken sich jedoch beide Scheibenteile 5 und 7 rechtwinklig zur Längsachse des Ventilstößels nach außen und gehen an zwei axial voneinander entfernten Stellen in die hohlzylindrische Wandung 2 über. Auf diese Weise entsteht eine kastenförmige Konstruktion, die eine noch höhere Steifigkeit besitzt, als die vorher beschriebenen. Um dabei den äußeren ringförmigen Ölvorratsraum nicht zu verkleinern, ist in dem zweiten Scheibenteil 7 eine Bohrung 9 vorgesehen, durch welche die beiden Teil-Vorratsräume, die durch das zweite Scheibenteil 7 getrennt sind, miteinander verbunden werden.Finally, FIG. 3 shows a further variant in which - similar to FIG. 2 - the first disk part 5 starts from the lower end of the guide sleeve 4 and the second disk part 7 from the upper end thereof. In contrast to FIG. 2, however, both disk parts 5 and 7 extend outwards at right angles to the longitudinal axis of the valve tappet and merge into the hollow cylindrical wall 2 at two axially distant locations. In this way, a box-shaped construction is created which has an even higher rigidity than that previously described. In order not to reduce the size of the outer annular oil storage space, a bore 9 is provided in the second disc part 7, through which the two partial storage spaces, which are separated by the second disc part 7, are connected to one another.

Claims (6)

1. Self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and consisting of a cup-shaped housing (1) comprising a hollow cylindrical wall (2) closed at one end by a bottom (3) against which a control cam abuts on the outside, a guide sleeve (4) concentric with the hollow cylindrical wall (2) being arranged in the housing (1) and opening at its end away from the bottom (3) into the centre of a disk member (5) which supports the guide sleeve at least in the radial direction and which at its outer periphery merges into the hollow cylindrical wall (2) of the housing (1), and is connected to said hollow cylindrical wall (2), the other end of the guide sleeve (4) being at a distance from the bottom (3) and the actual hydraulic clearance compensation element (6) being guided longitudinally displaceably in the guide sleeve (4), characterized in that a second disk member (7) is provided which starts from the hollow cylindrical wall (2) and gives additional support to the guide sleeve (4) at a distance from the first disk member (5).
2. Valve tappet according to claim 1, characterized in that the second disk member (7) merges into the hollow cylindrical wall (2) immediately next to the first disk member (5) from where it extends in the shape of a funnel towards the bottom (3) and engages the guide sleeve (4) near the end of the guide sleeve (4) facing the bottom (3).
3. Valve tappet according to claim 1 or 2, characterized in that the second disk member (7) merges at its bore into an axial collar (8) which receives the guide sleeve (4) in its bore.
4. Valve tappet according to claim 1, 2 or 3 characterized in that the second disk member (7) is connected firmly to the guide sleeve (4) by welding, soldering, gluing or the like.
5. Valve tappet according to claim 1 or 2, characterized in that the second disk member (7) is formed in one piece with the guide sleeve (4).
6. Valve tappet according to claims 1 and 5, characterized in that the two disk members (5, 7) are arranged at a distance from each other and almost at right angles to the longitudinal axis of the valve tappet, and are made in one piece with the guide sleeve (4) from whose two ends they start.
EP87115946A 1986-11-06 1987-10-30 Self-adjusting hydraulic valve tappet Expired - Lifetime EP0266685B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863637906 DE3637906A1 (en) 1986-11-06 1986-11-06 AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE
DE3637906 1986-11-06

Publications (2)

Publication Number Publication Date
EP0266685A1 EP0266685A1 (en) 1988-05-11
EP0266685B1 true EP0266685B1 (en) 1990-12-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87115946A Expired - Lifetime EP0266685B1 (en) 1986-11-06 1987-10-30 Self-adjusting hydraulic valve tappet

Country Status (5)

Country Link
US (1) US4825823A (en)
EP (1) EP0266685B1 (en)
JP (1) JPS63124811A (en)
DE (2) DE3637906A1 (en)
ES (1) ES2019919B3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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
JPH033905A (en) * 1989-05-16 1991-01-10 Volkswagen Ag <Vw> Vertical valve system , especially valve drive device for load alternating valve for internal combustion engine
US5119774A (en) * 1990-11-08 1992-06-09 General Motors Corporation Direct acting hydraulic valve lifter
US5245958A (en) * 1990-11-08 1993-09-21 General Motors Corporation Direct acting hydraulic valve lifter
DE19614668A1 (en) * 1996-04-13 1997-10-16 Schaeffler Waelzlager Kg Hydraulic support element for a valve control of an internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2758957A1 (en) * 1977-12-30 1979-07-05 Wizemann Gmbh U Co J Hydraulic tappet for IC engine valve - has actuating piston cylinder integral with oil reservoir and peripheral plates welded on to form top and bottom
DE2935751A1 (en) * 1979-09-05 1981-03-12 Fritz Gotthold 6453 Seligenstadt Rottluff Hydraulic tappet for IC engine - has air venting valves in tappet cap releasing air quickly when engine starts
DE3412175A1 (en) * 1984-03-31 1985-10-10 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt CUP-SHAPED HOUSING OF A SELF-ACTUATING HYDRAULICALLY ADJUSTING VALVE TOLDER FOR INTERNAL COMBUSTION ENGINES WITH OVERHEAD CAMSHAFT
DE3412176A1 (en) * 1984-03-31 1985-10-10 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt CUP-SHAPED HOUSING OF A SELF-ACTUATING HYDRAULICALLY ADJUSTING VALVE TOLDER FOR INTERNAL COMBUSTION ENGINES WITH OVERHEAD CAMSHAFT AND METHOD FOR THE PRODUCTION THEREOF
DE3432438C1 (en) * 1984-09-04 1986-05-22 Daimler-Benz Ag, 7000 Stuttgart Bucket tappet with hydraulic clearance adjustment for an exhaust and refill valve of an internal combustion engine
DE3437478A1 (en) * 1984-10-12 1986-04-17 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE
DE3542192A1 (en) * 1985-11-29 1987-06-04 Schaeffler Waelzlager Kg AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE

Also Published As

Publication number Publication date
JPH0343441B2 (en) 1991-07-02
US4825823A (en) 1989-05-02
JPS63124811A (en) 1988-05-28
DE3637906A1 (en) 1988-05-19
EP0266685A1 (en) 1988-05-11
DE3766598D1 (en) 1991-01-17
ES2019919B3 (en) 1991-07-16

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