EP1239124B1 - Deactivable tappet for transmission of cam lift on a pushrod - Google Patents
Deactivable tappet for transmission of cam lift on a pushrod Download PDFInfo
- Publication number
- EP1239124B1 EP1239124B1 EP02001305A EP02001305A EP1239124B1 EP 1239124 B1 EP1239124 B1 EP 1239124B1 EP 02001305 A EP02001305 A EP 02001305A EP 02001305 A EP02001305 A EP 02001305A EP 1239124 B1 EP1239124 B1 EP 1239124B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- pressure piston
- inner element
- tappet
- cavity
- 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
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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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/146—Push-rods
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- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length
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- 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 switchable plunger for the direct transmission of a Cam stroke on a push rod in a valve train of an internal combustion engine, with a housing in the axially extending recess with a longitudinally movable inner element assembled pressure piston runs, the housing on one side facing away from the recess Contact surface for a cam and the tappet on the side of the recess has a system for the push rod, where in a decoupling case in a radial web of the inner element runs at least one slide as a coupling means which for the coupling state it can be shifted radially outwards in sections, wherein the pressure piston has a hydraulic lash adjuster on one end has a leakage gap for hydraulic fluid on its outer jacket limited and a reservoir for hydraulic fluid within its bore includes and wherein a helical compression spring is provided, which is placed around the inner element and on this in the direction of the recess acts out.
- Such a plunger comes from the U.S. 6,196,175 B1.
- Revealed is a Housing with an internal element built into it.
- the inner element runs in the coupling state shown in FIG. 2 completely within a bore of the housing. In this area it is on one of its outer sheath Helical compression spring enclosed.
- a hydraulic pressure piston Game compensation elements at one end of which there is a push rod arranged within a bore of the inner element.
- Axially below the pressure piston runs between a bottom of the inner element and one Front of the pressure piston a high pressure room for hydraulic fluid. Between the inner element and the pressure piston is a leakage gap for the hydraulic medium created out of the high pressure room.
- the length of the housing is unnecessary increased.
- the plunger requires due to the nested arrangement with the Compression spring too large installation space in the diameter direction.
- the leakage gap lying on a relatively small diameter this is insufficient large.
- the ram has insufficient hydraulic rigidity.
- the object of the invention is therefore to provide a plunger of the type described above create, in which the disadvantages cited are eliminated with simple means.
- the plunger should on the one hand with respect to its mass and its radial space can be optimized and at the same time an improved hydraulic Possess rigidity.
- this object is achieved in that the pressure piston with its outer jacket is built directly into the recess in the housing and directly between its front and the closed, facing away from the housing of the high pressure chamber is formed, wherein the inner element runs directly in the bore of the pressure piston, the System for the push rod and the recess in the area with an approach one edge of the housing protrudes by which approach the helical compression spring is placed and wherein the at least one slide as coupling means for the coupling state from the inner element into a receptacle of the Pressure piston is displaceable.
- At least one radially displaceable slide is proposed as coupling means, which is positioned according to the invention in a radial web of the inner element is.
- the slide can radially outwards, in the coupling direction, in a receptacle of the pressure piston via compression spring force and radially inwards, in the decoupling direction, be shifted via hydraulic medium pressure.
- the radial web delimits in a simple manner with its underside at the same time a storage space enclosed by the pressure piston for the Hydraulic fluid in the direction away from the high-pressure chamber.
- a simple measure for supplying hydraulic fluid to the play compensation element is the subject of a further subclaim.
- the inner element also for lightweight reasons, is hollow cylindrical, viewed in the direction of flow, the system for the push rod in the inner element has at least one opening through which the hydraulic medium is supplied can be. Furthermore, there is between a flank of the radial web and an inner jacket of the inner element, at least one passage is formed, via which the hydraulic medium around the coupling means further into the storage space, which is largely enclosed by the pressure piston can be.
- Figure 1 discloses a switchable plunger 1 for the direct transmission of a Cam stroke on a push rod. This can be switched or switched off designed. It consists of a housing 2, in its recess 3 Pressure piston 4 runs with its outer jacket 5. Between the recess 3 and a leakage gap for hydraulic medium is formed in the outer jacket 5.
- One side 6 of the housing 2 facing away from the recess 3 is closed formed and has a contact surface 7 for a cam.
- the contact area 7 is designed as a roller, which is supported by a roller bearing 8 on a pin 9 is led.
- the bolt 9 is in turn mounted on the end face in the housing 2.
- a mouth of the recess 3, which faces away from the side 6, is from towers over an approach 10.
- This is thin-walled and hollow-cylindrical and connected in one piece to an inner element 11.
- Conceivable and provided is also a two-part training, in which the approach 10 as mentioned, for example, via a clip connection to the inner element 11 is coupled.
- the inner element 11 runs in a bore 12 of the aforementioned pressure piston 4 relatively axially movable to this. It has a Appendix 13 for a push rod, not shown, with an opening 14 for supplying hydraulic fluid into the plunger interior.
- the Inner element 11 with an end stop / a path limitation in the distance from the housing Direction is provided. This prevents the components from falling apart or can an exact location assignment of the coupling means mentioned later 19 for their inclusion 21 are created. Radial are conceivable protruding means such as pins, rings, tongue and groove connections and. ⁇ ., The communicate for example at the edge with the housing 2 or the pressure piston 4.
- FIG. 1 the person skilled in the art can see in FIG. 1 that the approach 10 is enclosed by a helical compression spring 15. This is at one end mounted on a support 16 facing away from the side 6 and on the other At the end it lies on an edge 17 of the pressure piston 4.
- the inner element has in its area lying inside the pressure piston 4 11 a radial web 18.
- Piston arranged as a coupling means 19. These are radially outward acted upon by the force of a spring means 20.
- the coupling means 19 run in sections in a corresponding one Recording 21 on the pressure piston 4.
- a displacement of the coupling means 19 relative radially inward for a decoupling purpose of the inner element 11 to the housing 2 is realized via hydraulic medium, which is in front of the end faces 22 the coupling means 19 can be passed.
- the arrangement of the helical compression spring 15 around the Approach 10 around the housing 2 can be shortened, which is the total mass of the Ram 1 advantageously reduced.
- the pressure piston 4 closes a storage space 25 above its end face 23 for hydraulic fluid. This is axially upwards through a bottom of the Radialsteges 18 limited. It can be seen that in the storage room 25 a further helical compression spring 26 is arranged. This supports the effect the helical compression spring 15. If necessary, the helical compression spring 26 can be dispensed with. Furthermore, there is a transverse one in the storage space 25 Bridge 27 indicated in the drawing. Below this, the one with at least is provided a passage for the hydraulic medium, that is ultimately Hydraulic fluid accumulated. Thus, the inner element 11 can be decoupled State of the housing 2 no longer undesirably pan in the storage room 25. The bridge 27 is arranged so that it is during the immersion movement of the inner element 11 is not touched by this.
- FIG. 2 An unimpeded supply line to the opening 14 of the system 13 hydraulic fluid to the storage space 25 is guaranteed that the radial web 18 has a passage 29 in the region of its flanks 28 has, which is limited by the inner jacket 30 of the inner member 11.
- a common supply of the hydraulic is also conceivable Play compensation elements 31 in the plunger 1 and the coupling means 19.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Actuator (AREA)
- Valve Device For Special Equipments (AREA)
Description
Die Erfindung betrifft einen schaltbaren Stößel zur direkten Übertragung eines Nockenhubes auf eine Stößelstange in einem Ventiltrieb einer Brennkraftmaschine, mit einem Gehäuse, in dessen sich axial erstreckender Aussparung ein mit einem längsbeweglichen Innenelement zusammengesteckter Druckkolben verläuft, wobei an einer der Aussparung abgewandten Seite das Gehäuse eine Anlauffläche für einen Nocken und der Stößel an der Seite der Aussparung eine Anlage für die Stößelstange hat, wobei im Entkoppelfall in einem Radialsteg des Innenelements wenigstens ein Schieber als Koppelmittel verläuft, der für den Koppelzustand abschnittsweise radial nach außen verlagerbar ist, wobei der Druckkolben an seiner einen Stirnseite ein hydraulisches Spielausgleichselement hat, an seinem Außenmantel einen Leckspalt für Hydraulikmittel begrenzt sowie innerhalb seiner Bohrung einen Vorratsraum für Hydraulikmittel einschließt und wobei eine Schraubendruckfeder vorgesehen ist, welche um das Innenelement gelegt ist und auf dieses in Richtung aus der Aussparung heraus einwirkt. The invention relates to a switchable plunger for the direct transmission of a Cam stroke on a push rod in a valve train of an internal combustion engine, with a housing in the axially extending recess with a longitudinally movable inner element assembled pressure piston runs, the housing on one side facing away from the recess Contact surface for a cam and the tappet on the side of the recess has a system for the push rod, where in a decoupling case in a radial web of the inner element runs at least one slide as a coupling means which for the coupling state it can be shifted radially outwards in sections, wherein the pressure piston has a hydraulic lash adjuster on one end has a leakage gap for hydraulic fluid on its outer jacket limited and a reservoir for hydraulic fluid within its bore includes and wherein a helical compression spring is provided, which is placed around the inner element and on this in the direction of the recess acts out.
Ein derartiger Stößel geht aus der U.S. 6,196,175 B1 hervor. Offenbart ist ein Gehäuse mit einem darin eingebauten Innenelement. Das Innenelement verläuft in dem in Fig. 2 gezeigten Koppelzustand vollständig innerhalb einer Bohrung des Gehäuses. In diesem Bereich ist es an seinem Außenmantel von einer Schraubendruckfeder umschlossen. Ein Druckkolben eines hydraulischen Spielausgleichselements, an dessen einem Ende eine Stößelstange anliegt, ist innerhalb einer Bohrung des Innenelements angeordnet. Axial unterhalb von dem Druckkolben verläuft zwischen einem Boden des Innenelements und einer Stirnseite des Druckkolbens ein Hochdruckraum für Hydraulikmittel. Zwischen dem Innenelement und dem Druckkolben ist ein Leckspalt für das Hydraulikmittel aus dem Hochdruckraum heraus geschaffen.Such a plunger comes from the U.S. 6,196,175 B1. Revealed is a Housing with an internal element built into it. The inner element runs in the coupling state shown in FIG. 2 completely within a bore of the housing. In this area it is on one of its outer sheath Helical compression spring enclosed. A hydraulic pressure piston Game compensation elements, at one end of which there is a push rod arranged within a bore of the inner element. Axially below the pressure piston runs between a bottom of the inner element and one Front of the pressure piston a high pressure room for hydraulic fluid. Between the inner element and the pressure piston is a leakage gap for the hydraulic medium created out of the high pressure room.
Einerseits ist aufgrund der innenliegenden Anordnung der Schraubendruckfeder, auch Lost-Motion-Feder genannt, die Baulänge des Gehäuses unnötig vergrößert. Somit liegt ein Stößel mit einer unerwünscht großen Masse vor. Gleichzeitig erfordert der Stößel wegen der geschachtelten Anordnung mit der Druckfeder einen zu großen Bauraum in Durchmesserrichtung. Andererseits ist durch den auf relativ kleinem Durchmesser liegenden Leckspalt dieser nur ungenügend groß. Dadurch besitzt der Stößel eine zu geringe hydraulische Steifigkeit.On the one hand, due to the internal arrangement of the helical compression spring, also called lost motion spring, the length of the housing is unnecessary increased. Thus there is a plunger with an undesirably large mass. At the same time, the plunger requires due to the nested arrangement with the Compression spring too large installation space in the diameter direction. On the other hand due to the leakage gap lying on a relatively small diameter, this is insufficient large. As a result, the ram has insufficient hydraulic rigidity.
Aufgabe der Erfindung ist es daher, einen Stößel der vorbeschriebenen Art zu schaffen, bei dem die zitierten Nachteile mit einfachen Mitteln beseitigt sind. Insbesondere soll der Stößel einerseits hinsichtlich seiner Masse und seines radialen Bauraums optimiert sein sowie gleichzeitig eine verbesserte hydraulische Steifigkeit besitzen. The object of the invention is therefore to provide a plunger of the type described above create, in which the disadvantages cited are eliminated with simple means. In particular, the plunger should on the one hand with respect to its mass and its radial space can be optimized and at the same time an improved hydraulic Possess rigidity.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass der Druckkolben mit seinem Außenmantel direkt in die Aussparung des Gehäuses eingebaut ist und unmittelbar zwischen seiner Stirnseite sowie der geschlossen ausgebildeten, abgewandten Seite des Gehäuses der Hochdruckraum gebildet ist, wobei das Innenelement unmittelbar in der Bohrung des Druckkolbens verläuft, die Anlage für die Stößelstange hat und mit einem Ansatz die Aussparung im Bereich eines Randes des Gehäuses überragt, um welchen Ansatz die Schraubendruckfeder gelegt ist und wobei der wenigstens eine Schieber als Koppelmittel für den Koppelzustand aus dem Innenelement in eine Aufnahme des Druckkolbens verlagerbar ist.According to the invention, this object is achieved in that the pressure piston with its outer jacket is built directly into the recess in the housing and directly between its front and the closed, facing away from the housing of the high pressure chamber is formed, wherein the inner element runs directly in the bore of the pressure piston, the System for the push rod and the recess in the area with an approach one edge of the housing protrudes by which approach the helical compression spring is placed and wherein the at least one slide as coupling means for the coupling state from the inner element into a receptacle of the Pressure piston is displaceable.
Somit sind die eingangs genannten Nachteile eliminiert. Durch den erfindungsgemäß aus der Aussparung des Gehäuses axial herausgeführten Ansatz des Innenelements mit der ihn umschließenden Druckfeder, wobei auch ein Druckfederpaket vorgesehen sein kann, ist das Gehäuse, welches mit seiner Masse relativ stark die Gesamtmasse des Stößels beeinflußt, deutlich leichter darstellbar. Der relativ schwere Gehäuseabschnitt ist durch ein dünnwandiges Bauteil (Ansatz des Innenelements), welches zudem einen kleineren Außendurchmesser hat, substituiert. Gleichzeitig baut der Stößel durch die axial nach oben verlagerte Druckfeder nicht unnötig breit.The disadvantages mentioned at the outset are thus eliminated. By the invention from the recess of the housing axially led approach of Inner element with the compression spring surrounding it, including a compression spring package can be provided is the housing, which with its mass affects the total mass of the plunger relatively much, much easier to represent. The relatively heavy housing section is through a thin-walled Component (attachment of the inner element), which also has a smaller outer diameter has substituted. At the same time, the plunger rebuilds axially compression spring displaced above not unnecessarily wide.
Da der Leckspalt im Vergleich zum beschreibungseinleitend genannten Stand der Technik nach außen verlagert wurde, ist dieser relativ groß. Somit besitzt der Stößel eine deutlich verbesserte hydraulische Steifigkeit.Since the leakage gap compared to the state mentioned in the introduction technology has been outsourced, it is relatively large. Thus owns the tappet has significantly improved hydraulic rigidity.
Als Koppelmittel ist wenigstens ein radial verlagerbarer Schieber vorgeschlagen, der gemäß der Erfindung in einem Radialsteg des Innenelements positioniert ist. Der Schieber kann radial nach außen, in Koppelrichtung, in eine Aufnahme des Druckkolbens über Druckfederkraft und radial nach innen, in Entkoppelrichtung, über Hydraulikmitteldruck verlagert werden. At least one radially displaceable slide is proposed as coupling means, which is positioned according to the invention in a radial web of the inner element is. The slide can radially outwards, in the coupling direction, in a receptacle of the pressure piston via compression spring force and radially inwards, in the decoupling direction, be shifted via hydraulic medium pressure.
Eine einfache Maßnahme einer Abstützung der außen liegenden Druckfeder geht aus einem ersten Unteranspruch hervor. Demnach kann die Schraubendruckfeder einenends gegen eine der Aufnahme abgewandte Abstützung des Ansatzes und anderenends gegen einen Rand bzw. randnahen Abschnitt des Druckkolbens oder Gehäuses wirken. Als einenendige Abstützung der Schraubendruckfeder um den Ansatz des Innenelements sind dabei ein- oder mehrteilige Ausbildungen denkbar. Hier wird lediglich auf separate Ringe bzw. Sicherungsringe oder einteilig vom Ansatz ausgehende Kragen verwiesen.A simple measure of supporting the external compression spring emerges from a first subclaim. Accordingly, the helical compression spring one end against a support of the Approach and at the other end against an edge or a portion of the Pressure piston or housing act. As one end support for the helical compression spring around the approach of the inner element are one or more parts Training possible. Here is only on separate rings or circlips or one-piece collar starting from the neck.
Wahlweise kann zu der um den Ansatz gelegten Schraubendruckfeder auch im Vorratsraum innerhalb des Druckkolbens eine weitere Schraubendruckfeder oder ein anderes Federelement angeordnet werden, was unterstützend zur erstgenannten Schraubendruckfeder wirkt.Optionally, in addition to the helical compression spring around the neck Another helical compression spring inside the pressure piston or another spring element can be arranged, which supports the first mentioned helical compression spring acts.
Der Radialsteg begrenzt in einfacher Art und Weise mit seiner Unterseite gleichzeitig einen vom Druckkolben eingeschlossenen Vorratsraum für das Hydraulikmittel in Richtung vom Hochdruckraum weg.The radial web delimits in a simple manner with its underside at the same time a storage space enclosed by the pressure piston for the Hydraulic fluid in the direction away from the high-pressure chamber.
Eine einfache Maßnahme zur Zuleitung von Hydraulikmittel zum Spielausgleichselement ist Gegenstand eines weiteren Unteranspruchs. Demnach ist das Innenelement, auch aus Leichtbaugründen, hohlzylindrisch ausgebildet, wobei in Fließrichtung gesehen die Anlage für die Stößelstange im Innenelement wenigstens eine Öffnung besitzt, über welche das Hydraulikmittel zugeleitet werden kann. Des Weiteren ist zwischen einer Flanke des Radialsteges und einem Innenmantel des Innenelements wenigstens ein Durchlaß gebildet, über den das Hydraulikmittel um die Koppelmittel herum weiter in den Vorratsraum, der vom Druckkolben weitestgehend eingeschlossen wird, zugeleitet werden kann.A simple measure for supplying hydraulic fluid to the play compensation element is the subject of a further subclaim. So is the inner element, also for lightweight reasons, is hollow cylindrical, viewed in the direction of flow, the system for the push rod in the inner element has at least one opening through which the hydraulic medium is supplied can be. Furthermore, there is between a flank of the radial web and an inner jacket of the inner element, at least one passage is formed, via which the hydraulic medium around the coupling means further into the storage space, which is largely enclosed by the pressure piston can be.
Damit es im Entkoppelzustand des Innenelements relativ zum Gehäuse nicht zu unnötigen Panschverlusten u. ä. beim Eintauchen des Innenelements kommt, ist im Vorratsraum wenigstens ein dieses in Richtung zum Radialsteg begrenzendes Brückenglied oder ähnliches Teil mit einer Öffnung zum Einlaß des Hydraulikmittels vorgesehen. Dieses kann auch eine Auslaufssicherungsfunktion bei Schräglagen des Stößels haben.So that it is not in the uncoupled state of the inner element relative to the housing to unnecessary splash losses and Ä. when immersing the inner element comes, there is at least one in the storage space in the direction of the radial web delimiting bridge member or similar part with an opening to the inlet of the hydraulic medium provided. This can also be a leak protection function if the ram is inclined.
In Fortbildung der Erfindung ist es vorgeschlagen, den Ansatz für die Schraubendruckfeder am Innenelement aus einem Leichtbauwerkstoff wie Blech zu bilden, als separates Bauteil herzustellen. Über zweckmäßige Verbindungsmaßnahmen wie Clipsen, Kleben, Löten, Schweißen kann der Ansatz mit dem Innenelement verbunden werden.In a further development of the invention, it is proposed to approach the helical compression spring on the inner element made of a lightweight material such as sheet metal form, to produce as a separate component. About appropriate liaison measures such as clipping, gluing, soldering, welding, the approach with the Inner element can be connected.
Schließlich liegt ein besonders reibungsarmer Nockenabgriff am Stößel dann vor, wenn dessen Anlauffläche als drehbare Rolle hergestellt ist, die zweckmäßigerweise über einen Bolzen, der wahlweise wälzgelagert sein kann, gegenüber dem Gehäuse abgestützt ist.Finally, there is a particularly low-friction cam tap on the tappet before if its contact surface is made as a rotatable roller, which is convenient via a bolt, which can be optionally roller-supported, opposite the housing is supported.
Die Erfindung ist anhand der Zeichnung näher erläutert. Es zeigen:
- Figur 1
- einen Längsschnitt durch einen erfindungsgemäßen Stößel und
Figur 2- eine Schnittansicht durch die Koppelmittel des Stößel entlang der Schnittlinie A-A der Figur 1.
- Figure 1
- a longitudinal section through a plunger according to the invention and
- Figure 2
- 2 shows a sectional view through the coupling means of the tappet along the section line AA in FIG. 1.
Figur 1 offenbart einen schaltbaren Stößel 1 zur direkten Übertragung eines
Nockenhubes auf eine Stößelstange. Dieser ist schaltbar bzw. abschaltbar
ausgelegt. Er besteht aus einem Gehäuse 2, in dessen Aussparung 3 ein
Druckkolben 4 mit seinem Außenmantel 5 verläuft. Zwischen der Aussparung 3
und dem Außenmantel 5 ist ein Leckspalt für Hydraulikmittel gebildet. Figure 1 discloses a switchable plunger 1 for the direct transmission of a
Cam stroke on a push rod. This can be switched or switched off
designed. It consists of a
Eine der Aussparung 3 abgewandte Seite 6 des Gehäuses 2 ist geschlossen
ausgebildet und besitzt eine Anlauffläche 7 für einen Nocken. Die Anlauffläche
7 ist als Rolle ausgebildet, die über eine Wälzlagerung 8 auf einem Bolzen 9
geführt ist. Der Bolzen 9 wiederum ist stirnseitig im Gehäuse 2 gelagert.One side 6 of the
Eine Mündung der Aussparung 3, welche der Seite 6 abgewandt ist, wird von
einem Ansatz 10 überragt. Dieser ist hier dünnwandig und hohlzylindrisch ausgebildet
und einteilig mit einem Innenelement 11 verbunden. Denkbar und vorgesehen
ist jedoch auch eine zweiteilige Ausbildung, bei welcher der Ansatz 10
wie genannt über beispielsweise eine Clipsverbindung mit dem Innenelement
11 gekoppelt ist. Das Innenelement 11 verläuft dabei in einer Bohrung 12 des
vorgenannten Druckkolbens 4 relativ axial beweglich zu diesem. Es hat eine
Anlage 13 für eine zeichnerisch nicht dargestellte Stößelstange mit einer Öffnung
14 zur Zuleitung von Hydraulikmittel ins Stößelinnere.A mouth of the
Zeichnerisch zwar nicht ausgeführt jedoch vorgesehen kann es sein, dass das
Innenelement 11 mit einem Endanschlag / einer Wegbegrenzung in gehäuseferne
Richtung versehen ist. Somit ist ein Auseinanderfallen der Bauteile verhinderbar
bzw. kann eine exakte Lagezuordnung der später genannten Koppelmittel
19 zu ihrer Aufnahme 21 geschaffen werden. Denkbar sind dabei radial
überstehende Mittel wie Stifte, Ringe, Feder-Nut-Verbindungen u. Ä., die
beispielsweise randseitig mit dem Gehäuse 2 bzw. Druckkolben 4 kommunizieren.Although not executed in the drawing, it can be provided that the
Des Weiteren kann sich der Fachmann Figur 1 entnehmen, dass der Ansatz 10
von einer Schraubendruckfeder 15 umschlossen ist. Diese ist an einem Ende
an einer der Seite 6 abgewandten Abstützung 16 gelagert und am anderen
Ende liegt sie auf einem Rand 17 des Druckkolbens 4.Furthermore, the person skilled in the art can see in FIG. 1 that the
In ihrem innerhalb des Druckkolbens 4 liegenden Bereich besitzt das Innenelement
11 einen Radialsteg 18. In diesem sind zwei sich gegenüberliegende
Kolben als Koppelmittel 19 angeordnet. Diese werden radial nach außen
über die Kraft eines Federmittels 20 beaufschlagt. Für den hier gezeigten
Koppelfall verlaufen die Koppelmittel 19 abschnittsweise in je einer korrespondierenden
Aufnahme 21 am Druckkolben 4. Eine Verlagerung der Koppelmittel
19 radial nach innen für einen Entkoppelzweck des Innenelements 11 relativ
zum Gehäuse 2 wird über Hydraulikmittel realisiert, welches vor Stirnseiten 22
der Koppelmittel 19 geleitet werden kann.The inner element has in its area lying inside the
Axial zwischen der Seite 6 des Gehäuses 2 und einer zugewandten Stirnseite
23 des Druckkolbens 4 ist ein Hochdruckraum 24 für Hydraulikmittel gebildet.
Aus diesem führt der vorgenannte Leckspalt für das Hydraulikmittel zwischen
dem Außenmantel 5 des Druckkolbens 4 und der Aussparung 3 des Gehäuses
2 axial nach oben. Durch die weitestmögliche Verlagerung des Leckspalts radial
nach außen ist dieser relativ groß, was sich positiv auf die hydraulische
Steifigkeit des gesamten Stößels 1 auswirkt.Axially between the side 6 of the
Gleichzeitig kann durch die Anordnung der Schraubendruckfeder 15 um den
Ansatz 10 herum das Gehäuse 2 verkürzt werden, was die Gesamtmasse des
Stößels 1 vorteilhaft verringert.At the same time, the arrangement of the
Der Druckkolben 4 schließt oberhalb seiner Stirnseite 23 einen Vorratsraum 25
für Hydraulikmittel ein. Dieser ist axial nach oben durch eine Unterseite des
Radialsteges 18 begrenzt. Es ist zu erkennen, dass im Vorratsraum 25 eine
weitere Schraubendruckfeder 26 angeordnet ist. Diese unterstützt die Wirkung
der Schraubendruckfeder 15. Gegebenenfalls kann auf die Schraubendruckfeder
26 verzichtet werden. Des Weiteren ist im Vorratsraum 25 eine quer verlaufende
Brücke 27 zeichnerisch angedeutet. Unterhalb dieser, die mit wenigstens
einem Durchlaß für das Hydraulikmittel versehen ist, ist letztendlich das
Hydraulikmittel akkumuliert. Somit kann das Innenelement 11 im abgekoppelten
Zustand vom Gehäuse 2 nicht mehr im Vorratsraum 25 unerwünscht panschen.
Die Brücke 27 ist so angeordnet, dass sie bei der Eintauchbewegung
des Innenelements 11 nicht von diesem berührt wird. The
Figur 2: Eine ungehinderte Zuleitung des an der Öffnung 14 der Anlage 13
anstehenden Hydraulikmittels zum Vorratsraum 25 ist dadurch gewährleistet,
dass der Radialsteg 18 im Bereich seiner Flanken 28 je einen Durchlaß 29
besitzt, der vom Innenmantel 30 des Innenelements 11 begrenzt ist. Somit wird
das Hydraulikmittel um die Koppelmittel 19 herum in Richtung zum Vorratsraum
25 geleitet. Denkbar ist auch eine gemeinsame Versorgung des hydraulischen
Spielausgleichselements 31 im Stößel 1 und der Koppelmittel 19. Figure 2: An unimpeded supply line to the
- 11
- Stößeltappet
- 22
- Gehäusecasing
- 33
- Aussparungrecess
- 44
- Druckkolbenpressure piston
- 55
- Außenmantelouter sheath
- 66
- Seitepage
- 77
- Anlaufflächeapproach surface
- 88th
- Wälzlagerungroller bearing
- 99
- Bolzenbolt
- 1010
- Ansatzapproach
- 1111
- Innenelementinner element
- 1212
- Bohrungdrilling
- 1313
- Anlageinvestment
- 1414
- Öffnungopening
- 1515
- SchraubendruckfederHelical compression spring
- 1616
- Abstützungsupport
- 1717
- Randedge
- 1818
- Radialstegradial web
- 1919
- Koppelmittelcoupling means
- 2020
- Federmittelspring means
- 2121
- Aufnahmeadmission
- 2222
- Stirnseitefront
- 2323
- Stirnseitefront
- 2424
- HochdruckraumHigh-pressure chamber
- 2525
- Vorratsraumpantry
- 2626
- SchraubendruckfederHelical compression spring
- 2727
- Brückebridge
- 2828
- Flankeflank
- 2929
- DurchlaßPassage
- 3030
- Innenmantelinner sheath
- 3131
- hydraulisches Spielausgleichselementhydraulic lash adjuster
Claims (7)
- Switchable tappet (1) for the direct transmission of a cam lift to a tappet push rod in a valve train of an internal combustion engine, said tappet comprising a housing (2) in whose axially extending cavity (3), a pressure piston (4) plugged together with a longitudinally displaceable inner element (11) extends, said housing (2) comprising, on an end (6) turned away from the cavity (3), a contact surface (7) for a cam, and the tappet (1) comprising on the side of the cavity (3), a support (13) for the push rod, at least one slide acting as a coupling means (19) extending in the uncoupled state in a radial web (18) of the inner element (11), which slide is partly displaceable outwards in radial direction for the coupled state, said pressure piston (4) comprising on one of its ends (23), a hydraulic clearance compensation element (31), delimiting on its outer peripheral surface (5), a leak gap for hydraulic medium, and enclosing within its bore (12), a reservoir (25) for hydraulic medium, a coiled compression spring (15) being provided and placed around the inner element (11) to act on this in a direction leading out of the cavity (3), characterised in that the pressure piston (4) is installed with its outer peripheral surface (5) directly in the cavity (3) of the housing (2), and the high pressure chamber (24) is formed directly between its end (23) and the closed, turned away end (6) of the housing (2), the inner element (11) extends directly in the bore (12) of the pressure piston (4), comprises the support (13) for the push rod and projects beyond the cavity (3) in the region of an edge of the housing (2) by means of an extension (10) around which the coiled compression spring (15) is placed, and the at least one slide acting as a coupling means (19) can be displaced for the coupled state out of the inner element (11) into a reception (21) of the pressure piston (4).
- Tappet according to claim 1, characterised in that the coiled compression spring (15) is supported at one end on a support (16) of the extension (10) turned away from cavity (3), and acts at another end, against an edge (17) or an edge-proximate section of the pressure piston (4) or of the housing (2), or is supported on the housing (2).
- Tappet according to claim 1, characterised in that the inner element (11) is hollow-cylindrical in shape and comprises at least one axially extending passage (29) for hydraulic medium, which passage (29) is formed radially between a flank (28) of the radial web (18) and an inner peripheral surface (30) of the inner element (11) and communicates at an inlet end with an opening (14) in the support (13) while leading at an outlet end into the reservoir (25) in the pressure piston (4), which reservoir (25) is delimited in a direction away from the end (23) of the pressure piston (4) by the radial web (18).
- Tappet according to claim 3, characterised in that the reservoir (25) is delimited in a direction towards the radial web (18)'by a thin-walled bridge (27) having at least one opening.
- Tappet according to claim 1, characterised in that a further coiled compression spring (26) is installed in the reservoir (25) and bears at one end against the end (23) of the pressure piston (4) while acting at the other end on the inner element (11) in a direction leading out of the cavity (3).
- Tappet according to claim 1, characterised in that the extension (10) is configured as a separate component and is made of thin-walled light-weight material such as sheet metal.
- Tappet according to claim 1, characterised in that the contact surface (7) for the cam is made as a rotatable roller that is mounted on the housing (2) on a bolt (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10111511 | 2001-03-09 | ||
| DE10111511A DE10111511A1 (en) | 2001-03-09 | 2001-03-09 | Switchable tappet for direct transmission of a cam stroke to a tappet rod |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1239124A2 EP1239124A2 (en) | 2002-09-11 |
| EP1239124A3 EP1239124A3 (en) | 2003-01-08 |
| EP1239124B1 true EP1239124B1 (en) | 2003-12-03 |
Family
ID=7676950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02001305A Expired - Lifetime EP1239124B1 (en) | 2001-03-09 | 2002-01-18 | Deactivable tappet for transmission of cam lift on a pushrod |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1239124B1 (en) |
| DE (2) | DE10111511A1 (en) |
| ES (1) | ES2211832T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11187119B2 (en) | 2019-09-16 | 2021-11-30 | Eaton Intelligent Power Limited | Latch pin for use in valve lifter and valve lifter |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB574852A (en) * | 1943-03-10 | 1946-01-23 | Gen Motors Corp | Improved hydraulic valve tappet for internal combustion engines |
| DE950515C (en) * | 1954-02-18 | 1956-10-11 | Maschf Augsburg Nuernberg Ag | Hydraulic lash adjuster |
| US2887996A (en) * | 1957-10-28 | 1959-05-26 | Wood George | Hydraulic lash adjusters |
| US2942595A (en) * | 1958-04-09 | 1960-06-28 | Johnson Products Inc | Hydraulic tappet |
| US5361733A (en) * | 1993-01-28 | 1994-11-08 | General Motors Corporation | Compact valve lifters |
| DE4442057B4 (en) * | 1994-11-25 | 2005-07-28 | Ina-Schaeffler Kg | Hydraulic lash adjuster |
| DE19844202A1 (en) * | 1998-09-26 | 2000-03-30 | Schaeffler Waelzlager Ohg | Internal combustion engine valve tappet comprises inner and outer section coupled and decoupled via spring-powered slide in section mountings to maximize or zero gas valve stroke |
| DE19947848A1 (en) * | 1998-10-28 | 2000-05-04 | Fev Motorentech Gmbh | Actuator for operating gas exchange valve in internal combustion engine has length compensated coupling element between control elements |
| US6196175B1 (en) * | 1999-02-23 | 2001-03-06 | Eaton Corporation | Hydraulically actuated valve deactivating roller follower |
-
2001
- 2001-03-09 DE DE10111511A patent/DE10111511A1/en not_active Withdrawn
-
2002
- 2002-01-18 EP EP02001305A patent/EP1239124B1/en not_active Expired - Lifetime
- 2002-01-18 DE DE50200120T patent/DE50200120D1/en not_active Expired - Lifetime
- 2002-01-18 ES ES02001305T patent/ES2211832T3/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11187119B2 (en) | 2019-09-16 | 2021-11-30 | Eaton Intelligent Power Limited | Latch pin for use in valve lifter and valve lifter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50200120D1 (en) | 2004-01-15 |
| ES2211832T3 (en) | 2004-07-16 |
| EP1239124A2 (en) | 2002-09-11 |
| EP1239124A3 (en) | 2003-01-08 |
| DE10111511A1 (en) | 2002-10-24 |
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