EP0272423A1 - Self-adjusting hydraulic valve tappet - Google Patents
Self-adjusting hydraulic valve tappet Download PDFInfo
- Publication number
- EP0272423A1 EP0272423A1 EP87116363A EP87116363A EP0272423A1 EP 0272423 A1 EP0272423 A1 EP 0272423A1 EP 87116363 A EP87116363 A EP 87116363A EP 87116363 A EP87116363 A EP 87116363A EP 0272423 A1 EP0272423 A1 EP 0272423A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow cylindrical
- cylindrical wall
- radial flange
- bore
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 239000011324 bead Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Images
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 one from the outside Control cam starts, a distance from the bottom in the bore of the hollow cylindrical wall a radial flange is provided which receives the actual hydraulic play compensation element in a longitudinally concentric bore to the hollow cylindrical wall.
- the radial flange is designed as a separate component and fastened in the bore in the hollow cylindrical wall.
- special measures are required, namely, e.g. B. welding, soldering or the like, but this does not disclose the known design (DE-OS 18 08 000).
- the invention has for its object to provide such a valve lifter, which has an extremely low mass with simple and inexpensive manufacture.
- the radial flange is designed as a separate component made of a material which has a higher coefficient of expansion than steel, in particular similar to that of aluminum, and that the outer jacket surface of the material is inserted into the bore in the hollow cylindrical wall and is fixed there is.
- the aforementioned selection of materials for the radial flange which in particular comprises plastic and aluminum, makes it possible to dispense entirely with special fastening methods, namely welding, soldering, gluing or the like. In the simplest case, one can rather press the radial flange, which is provided with a completely smooth outer surface, into the likewise smooth bore of the hollow cylindrical wall with an oversize.
- the radial flange has a higher coefficient of expansion than the hollow cylindrical wall ensures that even with the temperature differences occurring during operation, this interference fit never loosens, but rather becomes firmer.
- the outer annular oil reservoir is slightly reduced compared to conventional plungers.
- the radial flange has a higher coefficient of expansion than the hollow cylindrical wall can at the same time be used for a further advantage.
- engine cylinder heads made of light metal have been used more and more.
- the disadvantageous phenomenon occurs that with increasing heating the cylinder head expands more than the valve lifter made of steel, which increases the play between the valve lifter on the one hand and its receiving bore on the other. This leads to an undesirably large oil throughput.
- this disadvantage can be avoided or at least reduced be that the wall thickness of the hollow cylindrical wall is so thin-walled, at least in the longitudinal region in which the radial flange is arranged, that the radial flange is able to expand the wall elastically to the outside in the event of thermal expansion. Since the expansion coefficient of light metal on the one hand and suitable plastics, e.g. B. polyethersulfone are approximately the same, can be achieved so that the game of the valve lifter in its guide bore remains at least approximately constant in all temperature ranges.
- the radial flange can be fixed, for example, in that it has a circumferential groove on its outer lateral surface, into which a projection of the hollow cylindrical wall engages in a form-fitting manner.
- the projection of the hollow cylindrical wall can be formed in a simple manner by a circumferential bead which delimits an oil supply groove in the outer lateral surface of the hollow cylindrical wall.
- an additional seal in particular in the form of an O-ring, can be provided between the bore of the hollow cylindrical wall on the one hand and the outer surface of the radial flange on the other.
- the plastic radial flange z. B. to reduce its cross section for technical reasons, the radial flange can be provided with several recesses distributed over the circumference.
- the construction according to the invention also allows an additional leakage protection for the ring-shaped oil reservoir to be provided in a simple manner, without requiring any significant additional effort. Rather, it is only necessary to provide the radial flange in the vicinity of its outer circumferential surface with a hollow cylindrical collar which extends axially into the vicinity of the bottom and which, at least at one circumferential point, limits a longitudinal channel for the oil supply together with the bore of the hollow cylindrical wall, in which Area of the radial flange opens a hole starting from the oil feed groove.
- the valve lifter shown in Figure 1 has a cup-shaped housing 1, which consists of the hollow cylindrical wall 2, which is closed at the upper end by the bottom 3. At a distance from the bottom 3, the radial flange 4 is provided in the bore of the hollow cylindrical wall, which receives the actual hydraulic play compensation element 6 in a longitudinally displaceable manner in a bore 5 concentric with the hollow cylindrical wall 2.
- the radial flange 4 is made of a polymeric material.
- the radial flange 4 is fixed in the bore of the hollow cylindrical wall 2 in such a way that the radial flange 4 has on its outer lateral surface 7 a circumferential groove 8 into which a projection 9, which is designed as a circumferential bead, engages.
- This circumferential bead 9 simultaneously delimits an oil feed groove 10 in the outer lateral surface of the hollow cylindrical wall 2.
- the radial flange 4 is introduced into the bore of the hollow cylindrical wall 2 in a simple manner by axially pressing it into the cup-shaped housing 1.
- the actual hydraulic play compensation element 6 is guided directly in a bore of the radial flange made of polymeric material.
- the embodiment according to FIG. 2 differs from that described essentially only in that a metal bushing 11 is inserted into the bore of the radial flange 4, which is expedient if a plastic is used for the radial flange 4 which does not have sufficient dimensional stability and / or has unfavorable abrasion properties.
- an additional seal in the form of an O-ring 12 is also provided between the bore of the hollow cylindrical wall 2 on the one hand and the outer lateral surface 7 of the radial flange 4. Such an additional Sealing is only necessary in cases where the polymeric material of the radial flange 4 does not have sufficient elasticity.
- FIG. 3 shows a further variant, in which the radial flange 4 is first provided on its side facing the base 3 with a plurality of recesses 13 distributed over the circumference.
- the radial flange 4 in the vicinity of its outer lateral surface is provided with a hollow cylindrical collar 14 which extends axially into the vicinity of the base 3 and which, at least at one circumferential point, together with the bore of the hollow cylindrical wall 2, has a longitudinal channel 15 for the oil supply to the oil reservoir 16 limited, wherein in the longitudinal channel 15 in the region of the radial flange 4 opens out from the oil supply groove 10 bore 17.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Bei einem sich selbsttätig hydraulich einstellenden Ventilstößel, der in einer Führungsbohrung eines Zylinderkopfes einer Brennkraftmaschine angeordnet ist, und der aus einem tassenförmigen Gehäuse (1) besteht, welches eine hohlzylindrische Wandung (2) umfaßt, die am einen Ende durch einen Boden (3) verschlossen ist, gegen welchen von außen ein Steuernocken anläuft, wobei im Abstand vom Boden in der Bohrung der hohlzylindrischen Wandung (2) ein Radialflansch (4) vorgesehen ist, der in einer zu der hohlzylindrischen Wandung (2) konzentrischen Bohrung (5) das eigentliche hydraulische Spielausgleichselement (6) längsverschieblich aufnimmt, wird zur Vereinfachung der Herstellung bei gleichzeitiger Verringerung der Masse der Radialflansch (4) als gesondertes Bauteil aus einem Werkstoff ausgebildet, der einen höheren Ausdehnungskoeffizienten als Stahl, insbesondere ähnlich dem von Aluminium aufweist, und daß er mit seiner Außenmantelfläche (7) flüssigkeitsdicht in die Bohrung der hohlzylindrischen Wandung (2) eingesetzt und dort fixiert ist.In the case of 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 (1) which comprises a hollow cylindrical wall (2) which is closed at one end by a base (3) against which a control cam runs from the outside, a radial flange (4) being provided at a distance from the bottom in the bore of the hollow cylindrical wall (2), which is the actual hydraulic in a bore (5) concentric with the hollow cylindrical wall (2) Backlash compensation element (6) receives longitudinally displaceable, is made to simplify production while reducing the mass of the radial flange (4) as a separate component made of a material that has a higher expansion coefficient than steel, in particular similar to that of aluminum, and that it with its outer surface (7) liquid-tight in the bore of the hollow cylinder ischen wall (2) inserted and fixed there.
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, wobei im Abstand vom Bodem in der Bohrung der hohlzylindrischen Wandung ein Radialflansch vorgesehen ist, der in einer zu der hohlzylindrischen Wandung konzentrischen Bohrung das eigentliche hydraulische Spielausgleichselement längsverschieblich aufnimmt.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 one from the outside Control cam starts, a distance from the bottom in the bore of the hollow cylindrical wall a radial flange is provided which receives the actual hydraulic play compensation element in a longitudinally concentric bore to the hollow cylindrical wall.
Ein solcher Ventilstößel ist bereits bekannt geworden. Bei ihm ist das tassenförmige Gehäuse als ganzes, einschließlich des Radialflansches aus dem Vollen durch eine Drehbearbeitung hergestellt. Die spanabhebende Herstellung ist sehr teuer und führt dazu, daß das tassenförmige Gehäuse wegen der großen Wanddicken eine unerwünscht große Masse besitzt (US-PS 35 09 858).Such a valve lifter has already become known. For him, the cup-shaped housing as a whole, including the radial flange, is made from solid material by turning. The machining is very expensive and leads to the fact that the cup-shaped housing has an undesirably large mass because of the large wall thicknesses (US-PS 35 09 858).
Bei einer weiteren bekannten Ausführung ist der Radialflansch als gesondertes Bauteil ausgebildet und in der Bohrung der hohlzylindrischen Wandung befestigt. Um zu erreichen, daß dabei der Radialflansch ausreichend fest und insbesondere flüssigkeitsdicht mit der hohlzylindrischen Wandung verbunden ist, bedarf es besonderer Maßnahmen, nämlich z. B. des Schweißens, Lötens oder dergleichen, was jedoch die bekannte Ausführung nicht offenbart (DE-OS 18 08 000).In a further known embodiment, the radial flange is designed as a separate component and fastened in the bore in the hollow cylindrical wall. In order to ensure that the radial flange is connected sufficiently firmly and in particular in a liquid-tight manner to the hollow cylindrical wall, special measures are required, namely, e.g. B. welding, soldering or the like, but this does not disclose the known design (DE-OS 18 08 000).
Der Erfindung liegt die Aufgabe zugrunde, einen derartigen Ventilstößel zu schaffen, der bei einfachster und preiswertester Herstellung eine äußerst geringe Masse aufweist.The invention has for its object to provide such a valve lifter, which has an extremely low mass with simple and inexpensive manufacture.
Diese Aufgabe löst die Erfindung dadurch, daß der Radialflansch als gesondertes Bauteil aus einem Werkstoff ausgebildet ist, der einen höheren Ausdehnungskoeffizienten als Stahl, insbesondere ähnlich dem von Aluminium aufweist, und daß dieser mit seiner Außenmantelfläche flüssigkeitsdicht in die Bohrung der hohlzylindrischen Wandung eingesetzt und dort fixiert ist. Durch die genannte Werkstoffauswahl für den Radialflansch, die insbesondere Kunststoff und Aluminium umfaßt, ist es dabei möglich, auf besondere Befestigungsverfahren, nämlich Schweißen, Löten, Kleben oder dergleichen gänzlich zu verzichten. Im einfachsten Falle kann man vielmehr den mit einer völlig glatten äußeren Mantelfläche versehenen Radialflansch in die ebenfalls glatte Bohrung der hohlzylindrischen Wandung mit Übermaß einpressen. Dadurch, daß der Radialflansch einen höheren Ausdehnungskoeffizienten als die hohlzylindrische Wandung besitzt, ist sichergestellt, daß sich auch bei den im Betrieb auftretenden Temperaturdifferenzen dieser Preßverband niemals löst, sondern eher noch fester wird. Bei Herstellung des Radialflansches aus Kunststoff wird - bedingt durch die erforderliche Wanddicke des Radialflansches - der äußere ringförmige Ölvorratsraum gegenüber herkömmlichen Stößeln geringfügig verringert. Dies bringt zunächst den Vorteil mit sich, daß die im Stößel befindliche Ölmenge verkleinert wird, was die gesamte bewegte Masse des Stößels verringert. Weiterhin ist es vorteilhaft daß dieser Ölvorratsraum, wenn er einmal bei Stillstand des Motors leergelaufen ist, beim erneuten Starten schneller aufgefüllt wird, als ein größerer Ölvorratsraum, wodurch das bekannte Klappern des Stößels in dieser Anlaufphase verkürzt wird.This object is achieved by the fact that the radial flange is designed as a separate component made of a material which has a higher coefficient of expansion than steel, in particular similar to that of aluminum, and that the outer jacket surface of the material is inserted into the bore in the hollow cylindrical wall and is fixed there is. The aforementioned selection of materials for the radial flange, which in particular comprises plastic and aluminum, makes it possible to dispense entirely with special fastening methods, namely welding, soldering, gluing or the like. In the simplest case, one can rather press the radial flange, which is provided with a completely smooth outer surface, into the likewise smooth bore of the hollow cylindrical wall with an oversize. The fact that the radial flange has a higher coefficient of expansion than the hollow cylindrical wall ensures that even with the temperature differences occurring during operation, this interference fit never loosens, but rather becomes firmer. When manufacturing the radial flange from plastic - due to the required wall thickness of the radial flange - the outer annular oil reservoir is slightly reduced compared to conventional plungers. First of all, this has the advantage that the amount of oil in the tappet is reduced, which reduces the total moving mass of the tappet. Furthermore, it is advantageous that this oil storage space, once it has run empty when the engine is at a standstill, is filled up faster when restarting than a larger oil storage space, thereby shortening the known rattling of the tappet in this start-up phase.
Die Tatsache, daß der Radialflansch einen höheren Ausdehnungskoeffizienten als die hohlzylindrische Wandung besitzt, kann gleichzeitig für einen weiteren Vorteil ausgenutzt werden. In neuerer Zeit werden immer häufiger Motorzylinderköpfe aus Leichtmetall verwendet. Dabei tritt die nachteilige Erscheinung auf, daß mit zunehmender Erwärmung der Zylinderkopf sich mehr ausdehnt als der aus Stahl bestehende Ventilstößel, wodurch sich das Spiel zwischen dem Ventilstößel einerseits und seiner Aufnahmebohrung andererseits vergrößert. Dies führt zu einem unerwünscht großen Öldurchsatz. Bei Anwendung der erfindungsgemäßen Stößelkonstruktion kann dieser Nachteil dadurch umgangen oder wenigstens verringert werden, daß die Wanddicke der hohlzylindrischen Wandung wenigstens in dem Längsbereich, in dem der Radialflansch angeordnet ist, so dünnwandig ausgebildet ist, daß der Radialflansch bei Wärmeausdehnung in der Lage ist, die Wandung elastisch nach außen aufzuweiten. Da die Ausdehnungskoeffizienten von Leichtmetall einerseits und geeigneten Kunststoffen, z. B. Polyethersulfon annähernd gleich sind, läßt sich so erreichen, daß das Spiel des Ventilstößels in seiner Führungsbohrung in allen Temperaturbereichen wenigstens annähernd konstant bleibt.The fact that the radial flange has a higher coefficient of expansion than the hollow cylindrical wall can at the same time be used for a further advantage. In recent times, engine cylinder heads made of light metal have been used more and more. The disadvantageous phenomenon occurs that with increasing heating the cylinder head expands more than the valve lifter made of steel, which increases the play between the valve lifter on the one hand and its receiving bore on the other. This leads to an undesirably large oil throughput. When using the tappet construction according to the invention, this disadvantage can be avoided or at least reduced be that the wall thickness of the hollow cylindrical wall is so thin-walled, at least in the longitudinal region in which the radial flange is arranged, that the radial flange is able to expand the wall elastically to the outside in the event of thermal expansion. Since the expansion coefficient of light metal on the one hand and suitable plastics, e.g. B. polyethersulfone are approximately the same, can be achieved so that the game of the valve lifter in its guide bore remains at least approximately constant in all temperature ranges.
Um eine noch höhere Sicherheit zu gewährleisten, kann die Fixierung des Radialflansches beispielsweise dadurch erfolgen, daß er an seiner Außenmantelfläche eine Umfangsnut aufweist, in die ein Vorsprung der hohlzylindrischen Wandung formschlüssig eingreift. Dabei kann in einfacher Weise der Vorsprung der hohlzylindrischen Wandung durch eine Umfangswulst gebildet sein, die in der Außenmantelfläche der hohlzylindrischen Wandung eine Ölzuführnut begrenzt.In order to ensure an even higher level of security, the radial flange can be fixed, for example, in that it has a circumferential groove on its outer lateral surface, into which a projection of the hollow cylindrical wall engages in a form-fitting manner. In this case, the projection of the hollow cylindrical wall can be formed in a simple manner by a circumferential bead which delimits an oil supply groove in the outer lateral surface of the hollow cylindrical wall.
Obwohl es im Regelfalle nicht erforderlich ist, kann zwischen der Bohrung der hohlzylindrischen Wandung einerseits und der Außenmantelfläche des Radialflansches andererseits eine zusätzliche Abdichtung, insbesondere in form eines O-Ringes vorgesehen sein.Although it is generally not necessary, an additional seal, in particular in the form of an O-ring, can be provided between the bore of the hollow cylindrical wall on the one hand and the outer surface of the radial flange on the other.
Falls es für zweckmäßig gehalten wird, den aus Kunststoff bestehenden Radialflansch z. B. aus spritztechnischen Gründen in seinem Querschnitt zu reduzieren, kann der Radialflansch mit mehreren über den Umfang verteilten Ausnehmungen versehen sein.If it is considered appropriate, the plastic radial flange z. B. to reduce its cross section for technical reasons, the radial flange can be provided with several recesses distributed over the circumference.
Die erfindungsgemäße Konstruktion läßt es darüberhinaus zu, in einfacher Weise eine zusätzliche Auslaufsicherung für den ringförmigen Ölvorratsraum vorzusehen, ohne daß es dazu eines wesentlichen Mehraufwandes bedarf. Es muß hierzu vielmehr nur der Radialflansch in der Nähe seiner Außenmantelfläche mit einem sich axial bis in die Nähe des Bodens erstreckenden hohlzylindrischen Kragen versehen sein, der an wenigstens einer Umfangsstelle zusammen mit der Bohrung der hohlzylindrischen Wandung einen Längskanal für die Ölzuführung begrenzt, in welchen im Bereich des Radialflansches eine von der Ölzuführnut ausgehende Bohrung mündet.The construction according to the invention also allows an additional leakage protection for the ring-shaped oil reservoir to be provided in a simple manner, without requiring any significant additional effort. Rather, it is only necessary to provide the radial flange in the vicinity of its outer circumferential surface with a hollow cylindrical collar which extends axially into the vicinity of the bottom and which, at least at one circumferential point, limits a longitudinal channel for the oil supply together with the bore of the hollow cylindrical wall, in which Area of the radial flange opens a hole starting from the oil feed groove.
In den Zeichnungen ist die Erfindung anhand von drei Längsschnitten beispielhaft dargestellt.The invention is illustrated by way of example in the drawings with the aid of three longitudinal sections.
Der in Figur 1 gezeigte Ventilstößel besitzt ein tassenförmiges Gehäuse 1, welches aus der hohlzylindrischen Wandung 2 besteht, die am oberen Ende durch den Boden 3 verschlossen ist. Im Abstand von Boden 3 ist in der Bohrung der hohlzylindrischen Wandung der Radialflansch 4 vorgesehen, welcher in einer zu der hohlzylindrischen Wandung 2 konzentrischen Bohrung 5 das eigentliche hydraulische Spielausgleichselement 6 längsverschieblich aufnimmt.The valve lifter shown in Figure 1 has a cup-
Während das tassenförmige Gehäuse selbst aus Stahl besteht, ist der Radialflansch 4 aus einem polymeren Werkstoff hergestellt.While the cup-shaped housing itself is made of steel, the radial flange 4 is made of a polymeric material.
Die Fixierung des Radialflansches 4 in der Bohrung der hohlzylindrischen Wandung 2 erfolgt in der Art, daß der Radialflansch 4 an seiner Außenmantelfläche 7 eine Umfangsnut 8 aufweist, in die ein Vorsprung 9, der als eine Umfangswulst ausgeführt ist, eingreift. Diese Umfangswulst 9 begrenzt gleichzeitig in der Außenmantelfläche der hohlzylindrischen Wandung 2 eine Ölzuführnut 10.The radial flange 4 is fixed in the bore of the hollow
Das Einbringen des Radialflansches 4 in die Bohrung der hohlzylindrischen Wandung 2 erfolgt in einfacher Weise durch axiales Einpressen in das tassenförmige Gehäuse 1. Das eigentliche hydraulische Spielausgleichselement 6 ist dabei unmittelbar in einer Bohrung des aus polymerem Werkstoff bestehenden Radialflansches geführt.The radial flange 4 is introduced into the bore of the hollow
Die Ausführung nach Figur 2 unterscheidet sich von der vorher beschriebenen im wesentlichen nur dadurch, daß in die Bohrung des Radialflansches 4 eine Metallbuchse 11 eingesetzt ist, was dann zweckmäßig ist, wenn für den Radialflansch 4 ein Kunststoff verwendet wird, der keine ausreichende Maßstabilität und/oder ungünstige Abriebseigenschaften besitzt. Bei der in Figur 2 dargestellten Ausführung ist außerdem zwischen der Bohrung der hohlzylindrischen Wandung 2 einerseits und der Außenmantelfläche 7 des Radialflansches 4 andererseits eine zusätzliche Abdichtung in Form eines O-Ringes 12 vorgesehen. Eine solche zusätzliche Abdichtung ist nur in den Fällen erforderlich, in denen der polymere Werkstoff des Radialflansches 4 keine ausreichende Elastizität besitzt.The embodiment according to FIG. 2 differs from that described essentially only in that a
In Figur 3 ist schließlich eine weitere Variante gezeigt, bei welcher der Radialflansch 4 zunächst an seiner dem Boden 3 zugewandten Seite mit mehreren über den Umfang verteilten Ausnehmungen 13 versehen ist. Darüberhinaus ist der Radialflansch 4 in der Nähe seiner Außenmantelfläche mit einem sich axial bis in die Nähe des Bodens 3 erstreckenden hohlzylindrischen Kragen 14 versehen, der wenigstens an einer Umfangsstelle zusammen mit der Bohrung der hohlzylindrischen Wandung 2 einen Längskanal 15 für die Ölzuführung in den Ölvorratsraum 16 begrenzt, wobei in den Längskanal 15 im Bereich des Radialsflansches 4 eine von der Ölzuführnut 10 ausgehende Bohrung 17 mündet.Finally, FIG. 3 shows a further variant, in which the radial flange 4 is first provided on its side facing the
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3639911 | 1986-11-22 | ||
| DE19863639911 DE3639911A1 (en) | 1986-11-22 | 1986-11-22 | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0272423A1 true EP0272423A1 (en) | 1988-06-29 |
| EP0272423B1 EP0272423B1 (en) | 1991-04-10 |
Family
ID=6314530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87116363A Expired - Lifetime EP0272423B1 (en) | 1986-11-22 | 1987-11-06 | Self-adjusting hydraulic valve tappet |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4787347A (en) |
| EP (1) | EP0272423B1 (en) |
| JP (1) | JPS63131807A (en) |
| BR (1) | BR8706265A (en) |
| DE (2) | DE3639911A1 (en) |
| ES (1) | ES2021326B3 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0337242A1 (en) * | 1988-04-14 | 1989-10-18 | INA Wälzlager Schaeffler KG | Automatic hydraulic adjusting valve lifter |
| EP0478967A1 (en) * | 1990-10-01 | 1992-04-08 | INA Wälzlager Schaeffler KG | Self-adjusting hydraulic valve tappet |
| EP0485007A1 (en) * | 1990-11-08 | 1992-05-13 | General Motors Corporation | Improved direct-acting hydraulic valve-lifter |
| EP0566526A1 (en) * | 1992-04-14 | 1993-10-20 | Alusuisse-Lonza Services Ag | Hydraulic valve tappet cup-like housing for internal combustion engines with overhead camshaft |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US5245958A (en) * | 1990-11-08 | 1993-09-21 | General Motors Corporation | Direct acting hydraulic valve lifter |
| US5230308A (en) * | 1990-11-08 | 1993-07-27 | General Motors Corporation | Low mass direct acting hydraulic valve lifter |
| DE19602012A1 (en) * | 1996-01-20 | 1997-07-24 | Schaeffler Waelzlager Kg | Valve tappets actuated by a cam of an internal combustion engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0140674A2 (en) * | 1983-10-28 | 1985-05-08 | Eaton Corporation | Lash adjuster with embedded wear face |
| EP0197246A2 (en) * | 1985-04-12 | 1986-10-15 | Goetze Ag | Valve lash adjusting device |
| DE3615791A1 (en) * | 1985-05-22 | 1986-11-27 | Volkswagen AG, 3180 Wolfsburg | Closed hydraulic length adjusting device, especially for valves of internal combustion engines |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0030781B1 (en) * | 1979-12-05 | 1989-12-13 | Eaton Corporation | Hydraulic tappet for direct-acting valve gear |
| 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 |
| DE3409236A1 (en) * | 1984-03-14 | 1985-09-19 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | External guide part for a valve tappet |
| 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 |
| DE3437478A1 (en) * | 1984-10-12 | 1986-04-17 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
-
1986
- 1986-11-22 DE DE19863639911 patent/DE3639911A1/en not_active Withdrawn
-
1987
- 1987-09-28 US US07/101,634 patent/US4787347A/en not_active Expired - Fee Related
- 1987-11-06 ES ES87116363T patent/ES2021326B3/en not_active Expired - Lifetime
- 1987-11-06 EP EP87116363A patent/EP0272423B1/en not_active Expired - Lifetime
- 1987-11-06 DE DE8787116363T patent/DE3769297D1/en not_active Expired - Lifetime
- 1987-11-17 JP JP62288606A patent/JPS63131807A/en active Granted
- 1987-11-20 BR BR8706265A patent/BR8706265A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0140674A2 (en) * | 1983-10-28 | 1985-05-08 | Eaton Corporation | Lash adjuster with embedded wear face |
| EP0197246A2 (en) * | 1985-04-12 | 1986-10-15 | Goetze Ag | Valve lash adjusting device |
| DE3615791A1 (en) * | 1985-05-22 | 1986-11-27 | Volkswagen AG, 3180 Wolfsburg | Closed hydraulic length adjusting device, especially for valves of internal combustion engines |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0337242A1 (en) * | 1988-04-14 | 1989-10-18 | INA Wälzlager Schaeffler KG | Automatic hydraulic adjusting valve lifter |
| EP0478967A1 (en) * | 1990-10-01 | 1992-04-08 | INA Wälzlager Schaeffler KG | Self-adjusting hydraulic valve tappet |
| EP0485007A1 (en) * | 1990-11-08 | 1992-05-13 | General Motors Corporation | Improved direct-acting hydraulic valve-lifter |
| EP0566526A1 (en) * | 1992-04-14 | 1993-10-20 | Alusuisse-Lonza Services Ag | Hydraulic valve tappet cup-like housing for internal combustion engines with overhead camshaft |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3639911A1 (en) | 1988-06-01 |
| US4787347A (en) | 1988-11-29 |
| ES2021326B3 (en) | 1991-11-01 |
| JPS63131807A (en) | 1988-06-03 |
| BR8706265A (en) | 1988-06-28 |
| EP0272423B1 (en) | 1991-04-10 |
| JPH0451644B2 (en) | 1992-08-19 |
| DE3769297D1 (en) | 1991-05-16 |
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