EP1647678A1 - Hydraulic lash adjuster - Google Patents

Hydraulic lash adjuster Download PDF

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Publication number
EP1647678A1
EP1647678A1 EP05020320A EP05020320A EP1647678A1 EP 1647678 A1 EP1647678 A1 EP 1647678A1 EP 05020320 A EP05020320 A EP 05020320A EP 05020320 A EP05020320 A EP 05020320A EP 1647678 A1 EP1647678 A1 EP 1647678A1
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EP
European Patent Office
Prior art keywords
pressure piston
compensation element
face
housing
pressure
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
Application number
EP05020320A
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German (de)
French (fr)
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EP1647678B1 (en
Inventor
Peter Sailer
Oliver Dipl.-Ing. Schnell
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IHO Holding GmbH and Co KG
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Schaeffler KG
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Publication date
Priority claimed from DE102004050190A external-priority patent/DE102004050190A1/en
Application filed by Schaeffler KG filed Critical Schaeffler KG
Publication of EP1647678A1 publication Critical patent/EP1647678A1/en
Application granted granted Critical
Publication of EP1647678B1 publication Critical patent/EP1647678B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a hydraulic clearance compensation element, consisting of a hollow cylindrical housing, which is fitted together with a relative to this axially movable pressure piston, wherein between facing end faces of the pressure piston and housing a high-pressure chamber for hydraulic means extends, via a at a bottom of the end face of the pressure piston applied and opening in the direction of the high-pressure chamber check valve from a pressure chamber enclosed by the pressure chamber can be supplied with the hydraulic fluid, wherein between an outer jacket of the pressure piston and a bore of the housing, a leakage gap for the hydraulic fluid from the high-pressure chamber is formed, wherein the end face of the housing has a stop surface forms for a ring portion of the end face of the pressure piston in the sunken state and wherein the bore of the housing in its adjacent to the end face of the bore portion in a ring extension expires.
  • Such a clearance compensation element is disclosed in DE 199 42 983 A1. This is designed here as a hydraulic support element for a drag lever of a valve train of an internal combustion engine. If the internal combustion engine is turned off and the cam engaging the cam follower is in the stroke position, the pressure piston drops to the facing end face of the housing.
  • undesirable particles can accumulate, as the person skilled in the art does not have to explain in detail. These consist, for example, of production-related primary dirt or particles washed in by the hydraulic medium, such as abrasion. These particles adhere adhesively to the outer jacket of the pressure piston and can pass into a leakage gap between the outer jacket of the pressure piston and the bore of the housing in the next compensation process in which the pressure piston performs an axial movement directed out of the bore of the housing. This can lead to jamming of the pressure piston in the bore of the housing, with the result that a play compensation function of the play compensation element is no longer given or the valve lift can not be completed properly. The tendency for the unwanted particles to accumulate is further enhanced by the fact that there is relatively little volume in the radial direction of the ring enlargement (puncture) on the outer surface of the sunken plunger.
  • the object of the invention is therefore to provide a clearance compensation element of the aforementioned type, in which the disadvantages mentioned are eliminated.
  • this object is achieved in that the end face of the pressure piston is provided in its transition region to the outer shell with a chamfer whose height is equal to or greater than a height of the ring expansion.
  • the chamfer should have an angle ⁇ in the range of 30 ° ⁇ 15 ° with respect to the outer shell of the pressure piston.
  • An angle of 30 ° is to be regarded as preferred. This gives a particularly good wiping effect of the unwanted particles.
  • the pressure piston can be made substantially smooth-cylindrical and, as it is the subject of an independent claim, have on its outer casing at least one oil scraper ring or the like. Due to this oil control ring penetration of the unwanted particles is prevented as effectively in the leakage gap.
  • the outer jacket of the plunger itself or in combination with the enclosing bore of the housing or this hole alone a ⁇ labstreifring be shown similar.
  • a cam follower of a valve train of an internal combustion engine or to make it installable or to design it as part of such a cam follower.
  • a cam follower switchable, non-switchable
  • roller tappets for example, roller tappets, bucket tappets, tilting, rocking or drag lever into consideration.
  • the play compensation element according to the invention in a belt or Kettens Georgnnvoriques, for example, a primary or secondary drive of an internal combustion engine.
  • an application of the play compensation element according to the invention is everywhere conceivable, where it is necessary to compensate for thermal and / or wear-related game.
  • FIG. 1 discloses a cam follower 17, designed as a roller tappet, of a valve drive of an internal combustion engine.
  • this cam follower 17 the clearance compensation element 1 according to the invention is installed.
  • This consists, as is apparent from Figure 2, of a hollow cylindrical housing 2, which is assembled with a relative to this axially movable pressure piston 3.
  • the housing 2 is in the embodiment of Figure 1 an integral part of an outer housing of the roller tappet 17th
  • the pressure piston 3 has one end an end face 4. This spaced is an end face 5 of the housing 2 opposite. Between the end faces 4, 5, more precisely between an immediate bottom 7 of the end face 4 of the pressure piston 3 and a stop surface 13 of the end face 5 of the housing 2, a high-pressure chamber 6 is formed for hydraulic means.
  • the high pressure chamber 6 is supplied, if necessary, from an overlying reservoir 9 via a check valve 8 with hydraulic fluid.
  • the check valve 8 opens in the direction of the high-pressure chamber 6.
  • the reservoir 9 is surrounded by the pressure piston 3.
  • a leakage gap 12 for the hydraulic fluid from the high-pressure chamber 6 is formed between an outer shell 10 of the pressure piston 3 and a bore 11 of the housing 2.
  • a leakage gap 12 for the hydraulic fluid from the high-pressure chamber 6 is formed between an outer shell 10 of the pressure piston 3 and a bore 11 of the housing 2.
  • the end face 5 of the housing 2 forms with its stop face 13 in the sunk state of the pressure piston 3 a plant for the underside 7 with the ring section 14. If the engine is turned off and the cam in question is on "hub", the generated by the high-pressure chamber 6 and virtually stiff connection peu à peu lifted and the pressure piston 3 slips into the housing 2 until it comes to rest on the stop surface 13.
  • Production-related primary dirt can accumulate at the bottom region of the bore 11 of the housing 2, that is, on the stop surface 13.
  • other particles such as general impurities in the hydraulic fluid but also abrasion or the like can accumulate. If, after the internal combustion engine has been put into operation, a first compensatory movement of the pressure piston 3 out of the housing 2 occurs, particles adhering to the outer jacket 10 of the pressure piston 13 can be pulled into the leakage gap 12 in the prior art. This can lead to jamming of the pressure piston 3 in the housing 2 in the worst case, whereby a proper clearance compensation function of the play compensation element 1 is no longer given.
  • a ring extension 15 is applied.
  • the end face 4 of the pressure piston 3 with a chamfer 16 whose height H F is equal to or greater than a height H R of the ring extension 15.

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

Abstract

The hydraulic play adjustment element (1) has a cylindrical housing (2) with an axially movable piston (3). The high-pressure area (6), which is responsible for the hydraulic play, lies between front sides (4,5) of the piston and the housing. Height (H-f)of the Chamfer (16) provided between the front face (4) and passage area of the outer casing (10) is greater/equal to height (H r) of ring extension.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft ein hydraulisches Spielausgleichselement, bestehend aus einem hohlzylindrischen Gehäuse, welches mit einem relativ zu diesem axial beweglichen Druckkolben zusammengesteckt ist, wobei zwischen einander zugewandten Stirnseiten von Druckkolben und Gehäuse ein Hochdruckraum für Hydraulikmittel verläuft, der über ein an einer Unterseite der Stirnseite des Druckkolbens appliziertes und sich in Richtung zum Hochdruckraum öffnendes Rückschlagventil aus einem vom Druckkolben eingeschlossenen Vorratsraum mit dem Hydraulikmittel versorgbar ist, wobei zwischen einem Außenmantel des Druckkolbens und einer Bohrung des Gehäuses ein Leckspalt für das Hydraulikmittel aus dem Hochdruckraum gebildet ist, wobei die Stirnseite des Gehäuses eine Anschlagfläche für einen Ringabschnitt der Stirnseite des Druckkolbens in dessen abgesunkenem Zustand bildet und wobei die Bohrung des Gehäuses in ihrem an die Stirnseite der Bohrung grenzenden Abschnitt in einer Ringerweiterung ausläuft.The invention relates to a hydraulic clearance compensation element, consisting of a hollow cylindrical housing, which is fitted together with a relative to this axially movable pressure piston, wherein between facing end faces of the pressure piston and housing a high-pressure chamber for hydraulic means extends, via a at a bottom of the end face of the pressure piston applied and opening in the direction of the high-pressure chamber check valve from a pressure chamber enclosed by the pressure chamber can be supplied with the hydraulic fluid, wherein between an outer jacket of the pressure piston and a bore of the housing, a leakage gap for the hydraulic fluid from the high-pressure chamber is formed, wherein the end face of the housing has a stop surface forms for a ring portion of the end face of the pressure piston in the sunken state and wherein the bore of the housing in its adjacent to the end face of the bore portion in a ring extension expires.

Hintergrund der ErfindungBackground of the invention

Ein derartiges Spielausgleichselement ist in der DE 199 42 983 A1 offenbart. Dieses ist hier als hydraulisches Abstützelement für einen Schlepphebel eines Ventiltriebs einer Brennkraftmaschine ausgebildet. Wird die Brennkraftmaschine abgestellt und befindet sich der den Schlepphebel beaufschlagende Nocken auf Hub, so sinkt der Druckkolben auf die zugewandten Stirnseite des Gehäuses ab.Such a clearance compensation element is disclosed in DE 199 42 983 A1. This is designed here as a hydraulic support element for a drag lever of a valve train of an internal combustion engine. If the internal combustion engine is turned off and the cam engaging the cam follower is in the stroke position, the pressure piston drops to the facing end face of the housing.

Im Hochdruckraum können sich, wie dem Fachmann nicht näher erläutert werden muss, unerwünschte Partikel akkumulieren. Diese bestehen beispielsweise aus fertigungsbedingtem Urschmutz oder aus vom Hydraulikmittel eingeschwemmten Teilchen wie Abrieb. Diese Partikel lagern sich adhäsiv am Außenmantel des Druckkolbens an und können beim nächsten Ausgleichsvorgang, bei welchem der Druckkolben eine aus der Bohrung des Gehäuses gerichtete Axialbewegung vollzieht, in einen Leckspalt zwischen dem Außenmantel des Druckkolbens und der Bohrung des Gehäuses gelangen. Dies kann zu einem Verklemmen des Druckkolbens in der Bohrung des Gehäuses mit der Folge führen, dass eine Spielausgleichsfunktion des Spielausgleichselements nicht mehr gegeben ist bzw. der Ventilhub nicht mehr ordnungsgemäß vollzogen werden kann. Begünstigt wird die Neigung zum Anlagern der unerwünschten Teilchen noch dadurch, dass am Außenmantel des abgesunkenen Druckkolbens relativ wenig Volumen in Radialrichtung zu der Ringerweiterung (Einstich) vorliegt.In the high-pressure chamber, undesirable particles can accumulate, as the person skilled in the art does not have to explain in detail. These consist, for example, of production-related primary dirt or particles washed in by the hydraulic medium, such as abrasion. These particles adhere adhesively to the outer jacket of the pressure piston and can pass into a leakage gap between the outer jacket of the pressure piston and the bore of the housing in the next compensation process in which the pressure piston performs an axial movement directed out of the bore of the housing. This can lead to jamming of the pressure piston in the bore of the housing, with the result that a play compensation function of the play compensation element is no longer given or the valve lift can not be completed properly. The tendency for the unwanted particles to accumulate is further enhanced by the fact that there is relatively little volume in the radial direction of the ring enlargement (puncture) on the outer surface of the sunken plunger.

Im Stand der Technik wurde zudem versucht, das oben geschilderte Problem mit dem Urschmutz durch sehr aufwändige Spülmaßnahmen zu lösen. Auch ist bekannt, durch dem eigentlichen Spielausgleichselement unmittelbar vorgelagerte Abscheider wie Siebe, Magnete etc. ein Eindringen von unerwünschten Teilchen in den Hochdruckraum zu verhindern.In the prior art was also trying to solve the above-described problem with the original dirt by very complex flushing. It is also known, by the actual clearance compensation element immediately upstream separator such as screens, magnets, etc. to prevent the penetration of unwanted particles in the high-pressure chamber.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, ein Spielausgleichselement der vorgenannten Art zu schaffen, bei dem die genannten Nachteile beseitigt sind.The object of the invention is therefore to provide a clearance compensation element of the aforementioned type, in which the disadvantages mentioned are eliminated.

Lösung der AufgabeSolution of the task

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Stirnseite des Druckkolbens in ihrem Übergangsbereich zum Außenmantel mit einer Fase versehen ist, deren Höhe gleich oder größer einer Höhe der Ringerweiterung ist.According to the invention this object is achieved in that the end face of the pressure piston is provided in its transition region to the outer shell with a chamfer whose height is equal to or greater than a height of the ring expansion.

Hierdurch ist ein Anhaften der unerwünschten Partikel am Außenmantel des Druckkolbens wirkungsvoll verhindert oder anders gesagt hat der zylindrische Außenmantel des Druckkolbens keinen Kontakt mehr mit den unerwünschten Teilchen. Gleichzeitig liegt durch die relativ "hochgezogene" Fase mehr Volumen für Hydraulikmittel vor. Dies führt zwangsläufig dazu, dass mehr Raum für die unerwünschten Partikel vorhanden ist, ohne dass es zu einem Anhaften am Außenmantel des Druckkolbens kommt.As a result, adhesion of the unwanted particles on the outer jacket of the pressure piston is effectively prevented or in other words, the cylindrical outer surface of the pressure piston no longer has any contact with the unwanted particles. At the same time, there is more volume for hydraulic fluid due to the relatively "raised" bevel. This inevitably leads to more space for the unwanted particles, without causing it to adhere to the outer jacket of the pressure piston.

Eine besonders vorteilhafte Ausgestaltung der Erfindung ist Gegenstand eines weiteren Anspruchs. Demnach soll die Fase in Bezug auf den Außenmantel des Druckkolbens einen Winkel α im Bereich von 30° ± 15° aufweisen. Ein Winkel von 30° ist als bevorzugt anzusehen. Hierdurch ist eine besonders gute Abstreifwirkung der unerwünschten Partikel gegeben.A particularly advantageous embodiment of the invention is the subject of another claim. Accordingly, the chamfer should have an angle α in the range of 30 ° ± 15 ° with respect to the outer shell of the pressure piston. An angle of 30 ° is to be regarded as preferred. This gives a particularly good wiping effect of the unwanted particles.

Gegebenenfalls kann in dem o. g. Bereich der Druckkolben im wesentlichen glattzylindrisch ausgeführt sein und, so wie es Gegenstand eines nebengeordneten Anspruchs ist, an seinem Außenmantel wenigstens einen Ölabstreifring oder dergleichen aufweisen. Aufgrund dieses Ölabstreifrings wird ebenso wirksam ein Eindringen der unerwünschten Partikel in den Leckspalt verhindert. Gegebenenfalls kann der Außenmantel des Druckkolbens selbst oder in Kombination mit der ihn umschließenden Bohrung des Gehäuses oder diese Bohrung allein einem Ölabstreifring ähnlich dargestellt werden.Optionally, in the above-mentioned area, the pressure piston can be made substantially smooth-cylindrical and, as it is the subject of an independent claim, have on its outer casing at least one oil scraper ring or the like. Due to this oil control ring penetration of the unwanted particles is prevented as effectively in the leakage gap. Optionally, the outer jacket of the plunger itself or in combination with the enclosing bore of the housing or this hole alone a Ölabstreifring be shown similar.

Gemäß einer weiteren Ausgestaltung der Erfindung ist es vorgesehen, das Spielausgleichselement in einen Nockenfolger eines Ventiltriebs einer Brennkraftmaschine einzubauen oder einbaubar zu gestalten bzw. als Bestandteil eines solchen Nockenfolgers auszugestalten. Als Nockenfolger (schaltbar, nichtschaltbar) kommen beispielsweise Rollenstößel, Tassenstößel, Kipp-, Schwing- oder Schlepphebel in Betracht. Auch ist an Abstützelemente für Schlepphebel gedacht.According to a further embodiment of the invention, it is provided to incorporate the clearance compensation element in a cam follower of a valve train of an internal combustion engine or to make it installable or to design it as part of such a cam follower. As a cam follower (switchable, non-switchable) are, for example, roller tappets, bucket tappets, tilting, rocking or drag lever into consideration. Also is intended to support elements for rocker arms.

Gleichfalls ist es vorgeschlagen, das erfindungsgemäße Spielausgleichselement in eine Riemen- oder Kettenspännvorrichtung, beispielsweise eines Primär- oder Sekundärtriebes einer Brennkraftmaschine, einzubauen. Generell ist jedoch eine Applikation des erfindungsgemäßen Spielausgleichselements überall dort denkbar, wo es gilt, thermisch- und/oder verschleißbedingtes Spiel auszugleichen.Likewise, it is proposed to incorporate the play compensation element according to the invention in a belt or Kettenspännvorrichtung, for example, a primary or secondary drive of an internal combustion engine. In general, however, an application of the play compensation element according to the invention is everywhere conceivable, where it is necessary to compensate for thermal and / or wear-related game.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Erfindung ist zweckmäßiger Weise anhand der Zeichnung näher erläutert. Es zeigen:

Figur 1
einen Rollenstößel mit einem erfindungsgemäßen hydraulischen Spielausgleichselement und
Figur 2
das Spielausgleichselement nach Figur 1 in vergrößerter Darstellung.
The invention is expediently explained in more detail with reference to the drawing. Show it:
FIG. 1
a roller tappet with a hydraulic clearance compensation element according to the invention and
FIG. 2
the clearance compensation element of Figure 1 in an enlarged view.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Figur 1 offenbart einen als Rollenstößel ausgebildeten Nockenfolger 17 eines Ventiltriebs einer Brennkraftmaschine. In diesen Nockenfolger 17 ist das erfindungsgemäße Spielausgleichselement 1 eingebaut. Dieses besteht, wie auch aus Figur 2 hervorgeht, aus einem hohlzylindrischen Gehäuse 2, das mit einem relativ zu diesem axial beweglichen Druckkolben 3 zusammengebaut ist. Das Gehäuse 2 ist bei der Ausgestaltung nach Figur 1 integraler Bestandteil eines Außengehäuses des Rollenstößels 17.FIG. 1 discloses a cam follower 17, designed as a roller tappet, of a valve drive of an internal combustion engine. In this cam follower 17, the clearance compensation element 1 according to the invention is installed. This consists, as is apparent from Figure 2, of a hollow cylindrical housing 2, which is assembled with a relative to this axially movable pressure piston 3. The housing 2 is in the embodiment of Figure 1 an integral part of an outer housing of the roller tappet 17th

Der Druckkolben 3 hat einenends eine Stirnseite 4. Dieser beabstandet liegt eine Stirnseite 5 des Gehäuses 2 gegenüber. Zwischen den Stirnseiten 4, 5, genauer gesagt zwischen einer unmittelbaren Unterseite 7 der Stirnseite 4 des Druckkolbens 3 und einer Anschlagfläche 13 der Stirnseite 5 des Gehäuses 2, ist ein Hochdruckraum 6 für Hydraulikmittel gebildet. Der Hochdruckraum 6 wird bedarfsweise aus einem darüber liegenden Vorratsraum 9 über ein Rückschlagventil 8 mit Hydraulikmittel versorgt. Das Rückschlagventil 8 öffnet sich in Richtung zum Hochdruckraum 6. Der Vorratsraum 9 ist vom Druckkolben 3 umschlossen.The pressure piston 3 has one end an end face 4. This spaced is an end face 5 of the housing 2 opposite. Between the end faces 4, 5, more precisely between an immediate bottom 7 of the end face 4 of the pressure piston 3 and a stop surface 13 of the end face 5 of the housing 2, a high-pressure chamber 6 is formed for hydraulic means. The high pressure chamber 6 is supplied, if necessary, from an overlying reservoir 9 via a check valve 8 with hydraulic fluid. The check valve 8 opens in the direction of the high-pressure chamber 6. The reservoir 9 is surrounded by the pressure piston 3.

Zwischen einem Außenmantel 10 des Druckkolbens 3 und einer Bohrung 11 des Gehäuses 2 ist ein Leckspalt 12 für das Hydraulikmittel aus dem Hochdruckraum 6 gebildet. Beim Nockenhub wird, wie der Fachwelt ausreichend bekannt ist, eine geringfügige Menge an Hydraulikmittel aus dem Hochdruckraum 6 über den Leckspalt 12 ausgepresst und mittelbar wieder in den Vorratsraum 9 zurückgeführt.Between an outer shell 10 of the pressure piston 3 and a bore 11 of the housing 2, a leakage gap 12 for the hydraulic fluid from the high-pressure chamber 6 is formed. During the cam lift, as is well known to the experts, a small amount of hydraulic fluid is squeezed out of the high-pressure chamber 6 via the leakage gap 12 and indirectly returned to the reservoir 9.

Die Stirnseite 5 des Gehäuses 2 bildet mit ihrer Anschlagfläche 13 im zusammengesunkenen Zustand des Druckkolbens 3 eine Anlage für dessen Unterseite 7 mit dem Ringabschnitt 14. Wird die Brennkraftmaschine abgestellt und steht der betreffende Nocken auf "Hub", so wird die durch den Hochdruckraum 6 erzeugte und quasi steife Verbindung peu à peu aufgehoben und der Druckkolben 3 rutscht in das Gehäuse 2 hinein, bis er an dessen Anschlagfläche 13 zur Anlage kommt.The end face 5 of the housing 2 forms with its stop face 13 in the sunk state of the pressure piston 3 a plant for the underside 7 with the ring section 14. If the engine is turned off and the cam in question is on "hub", the generated by the high-pressure chamber 6 and virtually stiff connection peu à peu lifted and the pressure piston 3 slips into the housing 2 until it comes to rest on the stop surface 13.

Fertigungsbedingter Urschmutz kann sich am Bodenbereich der Bohrung 11 des Gehäuses 2, also auf der Anschlagfläche 13, ansammeln. Gegebenenfalls können sich auch andere Partikel wie generelle Verunreinigungen im Hydraulikmittel aber auch Abrieb oder dgl. akkumulieren. Kommt es nach Inbetriebnahme der Brennkraftmaschine zu einer ersten Ausgleichsbewegung des Druckkolbens 3 aus dem Gehäuse 2 heraus, so können im Stand der Technik am Außenmantel 10 des Druckkolbens 13 haftende Partikel in den Leckspalt 12 gezogen werden. Dies kann im ungünstigsten Fall zu einem Verklemmen des Druckkolbens 3 im Gehäuse 2 führen, wodurch eine ordnungsgemäße Spielausgleichsfunktion des Spielausgleichselements 1 nicht mehr gegeben ist.Production-related primary dirt can accumulate at the bottom region of the bore 11 of the housing 2, that is, on the stop surface 13. Optionally, other particles such as general impurities in the hydraulic fluid but also abrasion or the like can accumulate. If, after the internal combustion engine has been put into operation, a first compensatory movement of the pressure piston 3 out of the housing 2 occurs, particles adhering to the outer jacket 10 of the pressure piston 13 can be pulled into the leakage gap 12 in the prior art. This can lead to jamming of the pressure piston 3 in the housing 2 in the worst case, whereby a proper clearance compensation function of the play compensation element 1 is no longer given.

Im Übergangsbereich von der Bohrung 11 des Gehäuses 2 zu der Anschlagfläche 13 ist, wie näher aus Figur 2 hervorgeht, eine Ringerweiterung 15 appliziert. Um ein Anhaften der vorgenannten Partikel am Außenmantel 10 des Druckkolbens 3 zu verhindern, wird vorgeschlagen, die Stirnseite 4 des Druckkolbens 3 mit einer Fase 16 zu versehen, deren Höhe HF gleich oder größer einer Höhe HR der Ringerweiterung 15 ist.In the transition region from the bore 11 of the housing 2 to the stop surface 13, as shown in more detail from Figure 2, a ring extension 15 is applied. In order to prevent adhesion of the aforementioned particles on the outer jacket 10 of the pressure piston 3, it is proposed to provide the end face 4 of the pressure piston 3 with a chamfer 16 whose height H F is equal to or greater than a height H R of the ring extension 15.

Aufgrund dieser sehr einfachen Maßnahme ist ein Anhaften der unerwünschten Partikel am Außenmantel 10 des Druckkolbens 3 verhindert. Somit können diese Partikel auch nicht mehr in den Leckspalt 12 mit der vorgenannten negativen Folge gelangen.Because of this very simple measure, adhesion of the unwanted particles to the outer jacket 10 of the pressure piston 3 is prevented. Thus, these particles can not get into the leakage gap 12 with the aforementioned negative sequence.

Um ein besonders gutes Abstreifen der anhaftenden Partikel oder ähnliches zu erzielen, ist es vorgeschlagen, die Fase 16 in Bezug auf den Außenmantel 10 des Druckkolbens 3 in einem Winkel α im Bereich von 30° ± 15° auszuführen.In order to achieve a particularly good stripping of the adhering particles or the like, it is proposed to carry out the chamfer 16 with respect to the outer jacket 10 of the pressure piston 3 at an angle α in the range of 30 ° ± 15 °.

Auch ist aus Figur 2 zu entnehmen, dass durch die erfindungsgemäß ausgeführte Fase 16 mehr Volumen im Hochdruckraum 6 bei Anlage des Druckkolbens 3 an der Anschlagfläche 13 des Gehäuses 2 vorliegt. Somit ist einfach gesagt in diesem Bereich mehr Raum geschaffen, in welchem sich die unerwünschten Partikel verteilen können, ohne dass es zu einem Anhaften am Druckkolben 3 kommt.It can also be seen from FIG. 2 that more volume is present in the high-pressure chamber 6 when the pressure piston 3 rests against the stop surface 13 of the housing 2 due to the chamfer 16 designed according to the invention. It's easy said created in this area more space in which the unwanted particles can be distributed without causing adhesion to the plunger 3.

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11
SpielausgleichselementLash adjuster
22
Gehäusecasing
33
Druckkolbenpressure piston
44
Stirnseite DruckkolbenFront side of the pressure piston
55
Stirnseite GehäuseFront side housing
66
HochdruckraumHigh-pressure chamber
77
Unterseite DruckkolbenBottom pressure piston
88th
Rückschlagventilcheck valve
99
Vorratsraumpantry
1010
Außenmantelouter sheath
1111
Bohrungdrilling
1212
Leckspaltleakage gap
1313
Anschlagfläche GehäuseStop surface housing
1414
Ringabschnitt DruckkolbenRing section of pressure piston
1515
Ringerweiterungring expansion
1616
Fasechamfer
1717
Nockenfolgercam follower
HF H F
Höhe FaseHeight chamfer
HR H R
Höhe RingerweiterungHeight ring extension
αα
Winkel FaseAngle chamfer

Claims (5)

Hydraulisches Spielausgleichselement (1), bestehend aus einem hohlzylindrischen Gehäuse (2), welches mit einem relativ zu diesem axial beweglichen Druckkolben (3) zusammengesteckt ist, wobei zwischen einander zugewandten Stirnseiten (4, 5) von Druckkolben (3) und Gehäuse (2) ein Hochdruckraum (6) für Hydraulikmittel verläuft, der über ein an einer Unterseite (7) der Stirnseite (4) des Druckkolbens (3) appliziertes und sich in Richtung zum Hochdruckraum (6) öffnendes Rückschlagventil (8) aus einem vom Druckkolben (3) eingeschlossenen Vorratsraum (9) mit dem Hydraulikmittel versorgbar ist, wobei zwischen einem Außenmantel (10) des Druckkolbens (3) und einer Bohrung (11) des Gehäuses (2) ein Leckspalt (12) für das Hydraulikmittel aus dem Hochdruckraum (6) gebildet ist, wobei die Stirnseite (5) des Gehäuses (2) eine Anschlagfläche (13) für einen Ringabschnitt (14) der Stirnseite (4) des Druckkolbens (3) in dessen abgesunkenem Zustand bildet und wobei die Bohrung (11) des Gehäuses (2) in ihrem an die Stirnseite (5) der Bohrung (11) grenzenden Abschnitt in einer Ringerweiterung (15) ausläuft, dadurch gekennzeichnet, dass die Stirnseite (4) des Druckkolbens (3) in ihrem Übergangsbereich zum Außenmantel (10) mit einer Fase (16) versehen ist, deren Höhe (HF) gleich oder größer einer Höhe (HR) der Ringerweiterung (15) ist.Hydraulic clearance compensation element (1), consisting of a hollow-cylindrical housing (2), which is fitted together with a pressure piston (3) which is movable axially relative to one another, wherein pressure end faces (4, 5) facing each other are provided between pressure piston (3) and housing (2). a high-pressure chamber (6) extends for hydraulic medium, which is applied via a check valve (8), which is applied to the underside (7) of the end face (4) of the pressure piston (3) and opens in the direction of the high-pressure chamber (6), from one of the pressure piston (3). enclosed reservoir (9) can be supplied with the hydraulic fluid, wherein between an outer shell (10) of the pressure piston (3) and a bore (11) of the housing (2) a leakage gap (12) for the hydraulic fluid from the high-pressure chamber (6) is formed , wherein the end face (5) of the housing (2) forms a stop surface (13) for a ring portion (14) of the end face (4) of the pressure piston (3) in its sunk state and wherein the bore (11) of the Gehä uses (2) in its at the end face (5) of the bore (11) adjacent portion in a Ringerweiterung (15) expires, characterized in that the end face (4) of the pressure piston (3) in its transition region to the outer shell (10) a chamfer (16) is provided whose height (H F ) is equal to or greater than a height (H R ) of the ring extension (15). Spielausgleichselement nach Anspruch 1, dadurch gekennzeichnet, dass die Fase (16) in Bezug auf den Außenmantel (10) des Druckkolbens (3) einen Winkel (α) im Bereich von 30° ± 15° hat.Backlash compensation element according to claim 1, characterized in that the chamfer (16) has an angle (α) in the range of 30 ° ± 15 ° with respect to the outer jacket (10) of the pressure piston (3). Spielausgleichselement nach dem Oberbegriff des Anspruchs 1, dadurch gekennzeichnet, dass die Stirnseite (4) des Druckkolbens (3) in ihrem Übergangsbereich zum Außenmantel (10) mit einem Ölabstreifring versehen oder einem Außenmantel eines Ölabstreifrings ähnlich dargestellt ist.Backlash compensation element according to the preamble of claim 1, characterized in that the end face (4) of the pressure piston (3) in its transition region to the outer shell (10) provided with a Ölabstreifring or an outer jacket of a Ölabstreifrings is shown similar. Spielausgleichselement nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass das Spielausgleichselement (1) in einen Nockenfolger (17) oder in ein Abstützelement hierfür eines Ventiltriebs einer Brennkraftmaschine eingebaut oder integraler Bestandteil dieses ist.Play compensation element according to one of the preceding claims, characterized in that the clearance compensation element (1) incorporated in a cam follower (17) or in a support element for this purpose a valve train of an internal combustion engine or an integral part of this. Spielausgleichselement nach einem der Ansprüche 1 ― 3, dadurch gekennzeichnet, dass das Spielausgleichselement (1) in eine Spannvorrichtung für einen Riemen oder eine Kette eingebaut oder integraler Bestandteil dieser ist.Play compensation element according to one of claims 1-3, characterized in that the clearance compensation element (1) is incorporated in a tensioning device for a belt or a chain or an integral part of this.
EP05020320A 2004-10-14 2005-09-17 Hydraulic lash adjuster Expired - Fee Related EP1647678B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US61881004P 2004-10-14 2004-10-14
DE102004050190A DE102004050190A1 (en) 2004-10-15 2004-10-15 Hydraulic play element for internal combustion engine, has axially movable pressure piston combined together with cylindrical housing

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EP1647678A1 true EP1647678A1 (en) 2006-04-19
EP1647678B1 EP1647678B1 (en) 2007-03-21

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Citations (11)

* Cited by examiner, † Cited by third party
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US2689554A (en) * 1950-07-26 1954-09-21 Thompson Prod Inc Hydraulic valve lifter
GB716449A (en) * 1951-05-22 1954-10-06 Gen Motors Corp Improvements in hydraulic tappets
US2732832A (en) * 1956-01-31 Valve lifter
DE2061602A1 (en) * 1970-12-15 1972-06-29 Motomak Motorenbau Maschinen- U. Werkzeugfabrik, Konstruktionen Gmbh, 8070 Ingolstadt Self-adjusting, hydraulically adjusting lash adjuster for valve control in internal combustion engines
GB1354338A (en) * 1970-12-24 1974-06-05 Motomak Automatically and hydraulically selfadjusting play-compensating unit for the valve gear of internal combustion engines
DE2434831A1 (en) * 1974-07-19 1976-01-29 Daimler Benz Ag I.C. engine self adjusting hydraulic tappet - has deaerating storage chamber in series with working chamber
DE4103055A1 (en) * 1991-02-01 1992-08-06 Schaeffler Waelzlager Kg HYDRAULIC GAME COMPENSATION ELEMENT FOR THE USE OF INTERNAL COMBUSTION ENGINES
DE19942983A1 (en) * 1999-09-09 2001-03-15 Schaeffler Waelzlager Ohg Hydraulic tappet clearance compensation device for IC engines has pressure piston with separate head with smooth end face extending outside housing bore
JP2001355691A (en) * 2000-06-14 2001-12-26 Ntn Corp Chain tensioner
US20020108894A1 (en) * 2001-02-14 2002-08-15 Owen Nathan B. Mechanical oil filtration in an i.c. engine valve lifter
WO2003067038A1 (en) * 2002-02-06 2003-08-14 Ina-Schaeffler Kg Switch element for valve actuation in an internal combustion engine

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732832A (en) * 1956-01-31 Valve lifter
US2689554A (en) * 1950-07-26 1954-09-21 Thompson Prod Inc Hydraulic valve lifter
GB716449A (en) * 1951-05-22 1954-10-06 Gen Motors Corp Improvements in hydraulic tappets
DE2061602A1 (en) * 1970-12-15 1972-06-29 Motomak Motorenbau Maschinen- U. Werkzeugfabrik, Konstruktionen Gmbh, 8070 Ingolstadt Self-adjusting, hydraulically adjusting lash adjuster for valve control in internal combustion engines
GB1354338A (en) * 1970-12-24 1974-06-05 Motomak Automatically and hydraulically selfadjusting play-compensating unit for the valve gear of internal combustion engines
DE2434831A1 (en) * 1974-07-19 1976-01-29 Daimler Benz Ag I.C. engine self adjusting hydraulic tappet - has deaerating storage chamber in series with working chamber
DE4103055A1 (en) * 1991-02-01 1992-08-06 Schaeffler Waelzlager Kg HYDRAULIC GAME COMPENSATION ELEMENT FOR THE USE OF INTERNAL COMBUSTION ENGINES
DE19942983A1 (en) * 1999-09-09 2001-03-15 Schaeffler Waelzlager Ohg Hydraulic tappet clearance compensation device for IC engines has pressure piston with separate head with smooth end face extending outside housing bore
JP2001355691A (en) * 2000-06-14 2001-12-26 Ntn Corp Chain tensioner
US20020108894A1 (en) * 2001-02-14 2002-08-15 Owen Nathan B. Mechanical oil filtration in an i.c. engine valve lifter
WO2003067038A1 (en) * 2002-02-06 2003-08-14 Ina-Schaeffler Kg Switch element for valve actuation in an internal combustion engine

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* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 04 4 August 2002 (2002-08-04) *

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