EP0247230B1 - Cup-shaped tappet - Google Patents

Cup-shaped tappet Download PDF

Info

Publication number
EP0247230B1
EP0247230B1 EP86114107A EP86114107A EP0247230B1 EP 0247230 B1 EP0247230 B1 EP 0247230B1 EP 86114107 A EP86114107 A EP 86114107A EP 86114107 A EP86114107 A EP 86114107A EP 0247230 B1 EP0247230 B1 EP 0247230B1
Authority
EP
European Patent Office
Prior art keywords
cavity
hollow piston
bucket tappet
diaphragm
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86114107A
Other languages
German (de)
French (fr)
Other versions
EP0247230A3 (en
EP0247230A2 (en
Inventor
Alfred Laffter
Erich Neuthard
Klaus Schlag
Helmut Dr. Schlüter
Heinz Jansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Priority to AT86114107T priority Critical patent/ATE51935T1/en
Publication of EP0247230A2 publication Critical patent/EP0247230A2/en
Publication of EP0247230A3 publication Critical patent/EP0247230A3/en
Application granted granted Critical
Publication of EP0247230B1 publication Critical patent/EP0247230B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F01L2309/00—Self-contained lash adjusters

Definitions

  • the invention relates to a tappet for the automatic valve lash compensation of an internal combustion engine, comprising an outer housing with a first cavity, a hollow piston arranged in the first cavity, with a second cavity, a passage opening between the first and the second cavity and an inner housing arranged on the hollow piston a third cavity, the hollow piston and the inner housing being supported on one another by a compression spring and jointly delimiting a throttle gap, a non-return valve which is permeable in the direction of the third cavity being arranged between the second and the third cavity, wherein the check valve through the passage opening, the throttle gap the outer housing, the inner housing and the hollow piston jointly enclosed chamber is completely filled with incompressible liquid, the chamber being completely closed off from the outside by a liquid-impermeable boundary wall i st, wherein the outer housing, the hollow piston and the inner housing have a common axis and wherein the boundary wall is designed as an elastically resilient membrane in at least one partial area adjacent to the first cavity and annularly surrounding the axis, the membrane on the
  • Such a tappet is known from EP-A 0 156 260.
  • the service life that can be achieved with this is not yet satisfactory.
  • the invention has for its object to develop such a tappet such that there is an improved service life.
  • the boundary wall in the resilient partial area consists of a rolling membrane, which rests on the side facing away from the chamber against an annular support cage, the supporting cage being resiliently supported on the outer housing and pressed against the rolling membrane. From a functional point of view, it is unnecessary for the rolling membrane to have elastic properties. Accordingly, it can be designed in such a way that there is a particularly low material-specific load during the intended use. The service life of the tappet according to the invention is significantly improved.
  • the support cage is supported on supporting springs that are evenly distributed on the circumference and supported on the outer housing. This ensures a particularly quick filling of the third cavity from the second cavity via the interposed return valve, which, when the internal combustion engine is switched on, ensures that the valves which were exposed to the action of a cam during the previous engine shutdown immediately operate correctly.
  • the support cage can be of a U-shaped profile, the legs of the profile projecting, at least partially, into the intermediate zone between the suspension springs and the roller membrane. This significantly reduces the risk of damage to the roll diaphragm by the suspension springs.
  • the suspension springs are expediently designed as helical springs and are arranged parallel to the direction of movement of the inner housing. With a simple construction of the cup tappet, this ensures a particularly long service life with good functional reliability.
  • the ring membrane can be reinforced in the areas adjacent to the inner housing and to the outer housing by stiffening rings made of metallic material. Your assembly and thus the generation of the functional unit is particularly easy with such training.
  • the cup tappet shown is used for automatic valve lash compensation between the intake and exhaust valves of an internal combustion engine and the camshaft provided for valve actuation.
  • the tappet is accordingly arranged between the upper end of the respective valve of the camshaft, a mutual overlap between its axis and the direction of force having proven to be expedient.
  • the tappet includes the outer housing 1 with the first cavity 2, a hollow piston 3 arranged in the first cavity with the second cavity 4, a passage opening 5 between the first and the second cavity, an inner housing 6 arranged on the hollow piston 3 with a third cavity 7 , wherein the hollow piston 3 and the inner housing 6 are supported on one another by a compression spring 8 and jointly define an annular throttle gap 9, a non-return valve 10 which is permeable in the direction of the third cavity 7 being arranged between the second and third cavities 4, 7 and wherein is completely filled with incompressible liquid through the passage opening 5, the throttle gap 9, the outer housing 1, the inner housing 6 and the hollow piston 3.
  • the chamber is continuously closed off from the outside by a liquid-impermeable boundary wall, the boundary wall being formed in the annular gap between the outside of the inner housing 6 and the inside of the outer housing 1 by a flexible bellows.
  • the bellows has the shape of an annular roller membrane made of fabric-reinforced rubber, which is provided in the area of the inner and outer circumference with metal rings 12, 13 and seals them on the one hand on the inner housing 6 and on the other hand on the outer housing 1 is set.
  • the rolling diaphragm 11 is mounted in the intermediate zone between the two metal rings 12, 13 on an underside, circular-shaped support cage with a U-shaped downward open profile, in which three support springs 14 which are evenly distributed over the circumference engage.
  • the suspension springs are mounted on the underside of the support ring 15, which is axially immovably held in the outer housing 1 by the snap ring 16.
  • the support ring 15 can thereby give the support cage 17 and thus at the same time the rolling membrane 11 good guidance in the event of axial displacements.
  • the chamber enclosed by the first cavity 2, by the passage opening 5, by the second cavity 4, by the third cavity 7 and by the throttle gap 9 is completely filled with incompressible liquid.
  • the spring elasticity of the compression spring 8 is less than that of the closing spring of the associated valve and, with respect to the liquid contained in the chamber, has the same direction of action as the suspension springs 14.
  • the third cavity 7 therefore reaches its maximum filling volume, while the outer housing 1 also low force is applied to the underside of the camshaft and the inner housing 6 with an equally large force at the upper end of the associated valve. This is firmly closed by the action of the closing spring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Treating Waste Gases (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Steroid Compounds (AREA)
  • Cookers (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Food-Manufacturing Devices (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

A piston-cylinder cup-type tappet for an internal combustion engine comprises an outer housing defining a first cavity and a hollow piston having a second cavity with the hollow piston being disposed in the first cavity. An aperture provides for fluid flow between the first and second cavities. An inner housing is disposed in the first cavity with the inner housing defining a third cavity. The piston is received in the third cavity of the inner housing wherein the piston and the inner housing jointly define a throttle gap. A compression spring is disposed in the third cavity and supports the hollow piston and the inner housing. A check valve is disposed between the second and third cavities and permits fluid flow from the second cavity to the third cavity. A chamber is defined by the first cavity, the second cavity, the third cavity, the aperture and the throttle gap. An incompressible fluid fills this chamber. The chamber is closed off from the exterior thereof by a fluid impermeable wall and at least a portion of this wall adjacent the first cavity is designed as an elastically resilient spring bellows.

Description

Die Erfindung betrifft einen Tassenstößel für den automatischen Ventilspielausgleich eines Verbrennungsmotors, umfassend ein Außengehäuse mit einem ersten Hohlraum, einen in dem ersten Hohlraum angeordneten Hohlkolben, mit einem zweiten Hohlraum, eine Durchtrittsöffnung zwischen dem ersten und dem zweiten Hohlraum und ein auf dem Hohlkolben angeordnetes Innengehäuse mit einem dritten Hohlraum, wobei der Hohlkolben und das Innengehäuse durch eine Druckfeder aufeinander abgestützt sind und gemeinsam einen Drosselspalt begrenzen, wobei zwischen dem zweiten und dem dritten Hohlraum ein in Richtung des dritten Hohlraumes durchlässiges Rückschlagventil angeordnet ist, wobei die durch die Durchtrittsöffnung, den Drosselspalt, das Außengehäuse, das Innengehäuse und den Hohlkolben gemeinsam umschlossene Kammer vollständig mit inkompressibler Flüssigkeit gefüllt ist, wobei die Kammer durchgehend durch eine flüssigkeitsundurchlässige Begrenzungswand nach außen abgeschlossen ist, wobei das Außengehäuse, der Hohlkolben und das Innengehäuse eine gemeinsame Achse haben und wobei die Begrenzungswand in wenigstens einem an den ersten Hohlraum angrenzenden, die Achse ringförmig umschließenden Teilbereich als elastisch nachgiebige Membran gestaltet ist, wobei die Membran auf der von der Kammer abgewandten Seite an einem kreisringförmig gestalteten Stützkäfig anliegt und der Stützkäfig federnd auf dem Außengehäuse abgestützt und an die Membran angepreßt ist.The invention relates to a tappet for the automatic valve lash compensation of an internal combustion engine, comprising an outer housing with a first cavity, a hollow piston arranged in the first cavity, with a second cavity, a passage opening between the first and the second cavity and an inner housing arranged on the hollow piston a third cavity, the hollow piston and the inner housing being supported on one another by a compression spring and jointly delimiting a throttle gap, a non-return valve which is permeable in the direction of the third cavity being arranged between the second and the third cavity, wherein the check valve through the passage opening, the throttle gap the outer housing, the inner housing and the hollow piston jointly enclosed chamber is completely filled with incompressible liquid, the chamber being completely closed off from the outside by a liquid-impermeable boundary wall i st, wherein the outer housing, the hollow piston and the inner housing have a common axis and wherein the boundary wall is designed as an elastically resilient membrane in at least one partial area adjacent to the first cavity and annularly surrounding the axis, the membrane on the side facing away from the chamber abuts an annular support cage and the support cage is resiliently supported on the outer housing and pressed against the membrane.

Ein solcher Tassenstößel ist aus der EP-A 0 156 260 bekannt. Die damit erzielbare Gebrauchsdauer ist noch nicht befriedigend. Der Erfindung liegt die Aufgabe zugrunde einen solchen Tassenstößel derart weiter zu entwickeln, daß sich eine verbesserte Gebrauchsdauer ergibt.Such a tappet is known from EP-A 0 156 260. The service life that can be achieved with this is not yet satisfactory. The invention has for its object to develop such a tappet such that there is an improved service life.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen von Anspruch 1 gelöst.This object is achieved according to the invention with the characterizing features of claim 1.

Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche bezug.The subclaims refer to advantageous configurations.

Bei dem erfindungsgemäßen Tassenstößel besteht die Begrenzungswand in dem elastisch nachgiebigen Teilbereich aus einer Rollmembran, die auf der von der Kammer abgewandten Seite an einem kreisringförmig gestalteten Stützkäfig anliegt, wobei der Stützkäfig federnd auf dem Außengehäuse abgestützt und an die Rollmembran angepreßt ist. In funktioneller Hinsicht ist es dadurch entbehrlich, daß die Rollmembran elastische Eigenschaften aufweist. Sie kann dementsprechend so gestaltet sein, daß sich eine besonders geringe werkstoffspezifische Belastung während der bestimmungsgemäßen Verwendung ergibt. Die Gebrauchsdauer des erfindungsgemäßen Tassenstößels erfährt dadurch eine wesentliche Verbesserung.In the cup tappet according to the invention, the boundary wall in the resilient partial area consists of a rolling membrane, which rests on the side facing away from the chamber against an annular support cage, the supporting cage being resiliently supported on the outer housing and pressed against the rolling membrane. From a functional point of view, it is unnecessary for the rolling membrane to have elastic properties. Accordingly, it can be designed in such a way that there is a particularly low material-specific load during the intended use. The service life of the tappet according to the invention is significantly improved.

Der Stützkäfig ist auf gleichmäßig auf dem Umfang verteilten, auf dem Außengehäuse abgestützten Tragfedern gelagert. Hierdurch ist ein besonders schnelles Auffüllen des dritten Hohlraumes aus dem zweiten Hohlraum über das zwischengeschaltete Rücklaufventil gewährleistet, was beim Einschalten des Verbrennungsmotors eine sofort richtige Betätigung auch derjenigen Ventile gewährleistet, die während des vorausgegangenen Motorstillstandes der Einwirkung eines Nockens ausgesetzt waren.The support cage is supported on supporting springs that are evenly distributed on the circumference and supported on the outer housing. This ensures a particularly quick filling of the third cavity from the second cavity via the interposed return valve, which, when the internal combustion engine is switched on, ensures that the valves which were exposed to the action of a cam during the previous engine shutdown immediately operate correctly.

Der Stützkäfig kann von U-förmigem Profil sein, wobei die Schenkel des Profils in die Zwischenzone zwischen den Tragfedern und der Rollmembran, zumindest teilweise hineinragen. Die Gefahr einer Beschädigung der Rollmembran durch die Tragfedern ist hierdurch entscheidend vermindert.The support cage can be of a U-shaped profile, the legs of the profile projecting, at least partially, into the intermediate zone between the suspension springs and the roller membrane. This significantly reduces the risk of damage to the roll diaphragm by the suspension springs.

Die Tragfedern sind zweckmäßig als Wendelfedem ausgsbildet und parallel zur Bewegungsrichtung des Innengehäuses angeordnet. Bei einfachem Aufbau des Tassenstößels wird hierdurch eine besonders lange Gebrauchsdauer bei guter Funktionssicherheit gewährleistet.The suspension springs are expediently designed as helical springs and are arranged parallel to the direction of movement of the inner housing. With a simple construction of the cup tappet, this ensures a particularly long service life with good functional reliability.

Die Ringmembran kann in den an dem Innengehäuse und an dem Außengehäuse anliegenden Bereichen durch Versteifungsringe aus metallischem Werkstoff verstärkt sein. Ihre Montage und damit die Erzeugung der funktionsfähigen Einheit gestaltet sich bei einer solchen Ausbildung besonders einfach.The ring membrane can be reinforced in the areas adjacent to the inner housing and to the outer housing by stiffening rings made of metallic material. Your assembly and thus the generation of the functional unit is particularly easy with such training.

Der Gegenstand der vorliegenden Erfindung wird nachfolgend anhand der in der Anlage beigefügten Zeichnung weiter erläutert.The object of the present invention is explained in more detail below with reference to the drawing attached to the system.

Der gezeigte Tassenstößel dient dem automatischen Ventilspielausgleich zwischen dem Ein- bzw. dem Auslaßventil eines Verbrennungsmotors und der für die Ventilbetätigung vorgesehenen Nockenwelle. Der Tassenstößel ist demgemäß zwischen dem oberen Ende des jeweiligen Ventils der Nockenwelle angeordnet, wobei sich eine gegenseitige Deckung zwischen seiner Achse und der Kraftwirkungsrichtung als zweckmäßig erwiesen hat.The cup tappet shown is used for automatic valve lash compensation between the intake and exhaust valves of an internal combustion engine and the camshaft provided for valve actuation. The tappet is accordingly arranged between the upper end of the respective valve of the camshaft, a mutual overlap between its axis and the direction of force having proven to be expedient.

Der Tassenstößel umfaßt das Außengehäuse 1 mit dem ersten Hohlraum 2, einen in dem ersten Hohlraum angeordneten Hohlkolben 3 mit dem zweiten Hohlraum 4, eins Durchtrittsöffnung 5 zwischen dem ersten und dem zweiten Hohlraum, ein auf dem Hohlkolben 3 angeordnetes Innengehäuse 6 mit einem dritten Hohlraum 7, wobei der Hohlkolben 3 und das Innengehäuse 6 durch eine Druckfeder 8 aufeinander abgestützt sind und gemeinsam einen ringförmigen Drosselspalt 9 begrenzen, wobei zwischen dem zweiten und dem dritten Hohlraum 4, 7 ein in Richtung des dritten Hohlraumes 7 durchlässiges Rückschlagventil 10 angeordnet ist und wobei die durch die Durchtrittsöffnung 5, den Drosselspalt 9, das Außengehäuse 1, das Innengehäuse 6 und den Hohlkolben 3 gemeinsam umschlossene Kammer vollständig mit inkompressibler Flüssigkeit gefüllt ist. Die Kammer ist durchgehend durch eine flüssigkeitsundurchlässige Begrenzungswand nach außen abgeschlossen, wobei die Begrenzungswand im Ringspalt zwischen der Außenseite des Innengehäuses 6 und der Innenseite des Außengehäuses 1 durch einen nachgiebigen Federbalg gebildet wird. Der Federbalg hat die Gestalt einer kreisringförmig ausgebildeten Rollmembran aus gewebearmiertem Gummi, welche im Bereich des Innen- und des Aussenumfanges mit Metallringen 12, 13 versehen und durch dieselben dichtend einerseits an dem Innengehäuse 6 und andererseits an dem Außengehäuse 1 festgelegt ist. Die Rollmembran 11 ist in der Zwischenzone zwischen beiden Metallringen 12, 13 auf einem unterseits anliegenden, kreisringförmig gestalteten Stützkäfig von U-förmig nach unten geöffnetem Profil gelagert in welchen drei gleichmäßig auf den Umfang verteilte Tragfedern 14 eingreifen. Die Tragfedern sind unterseits auf dem Stützring 15 gelagert, welcher durch den Sprengring 16 axial unverrückbar in dem Außengehäuse 1 gehaltert ist. Durch gegenseitige Anpassung des Außendurchmessers des Stützringes 15 an den Innendurchmessers des Gehäuses 1 ist eine präzise gegenseitige Zuordnung in radialer Richtung gewährleistet. Der Stützring 15 vermag dadurch dem Stützkäfig 17 und damit zugleich der Rollmembran 11 eine gute Führung bei axialen Verlagerungen zu verleihen.The tappet includes the outer housing 1 with the first cavity 2, a hollow piston 3 arranged in the first cavity with the second cavity 4, a passage opening 5 between the first and the second cavity, an inner housing 6 arranged on the hollow piston 3 with a third cavity 7 , wherein the hollow piston 3 and the inner housing 6 are supported on one another by a compression spring 8 and jointly define an annular throttle gap 9, a non-return valve 10 which is permeable in the direction of the third cavity 7 being arranged between the second and third cavities 4, 7 and wherein is completely filled with incompressible liquid through the passage opening 5, the throttle gap 9, the outer housing 1, the inner housing 6 and the hollow piston 3. The chamber is continuously closed off from the outside by a liquid-impermeable boundary wall, the boundary wall being formed in the annular gap between the outside of the inner housing 6 and the inside of the outer housing 1 by a flexible bellows. The bellows has the shape of an annular roller membrane made of fabric-reinforced rubber, which is provided in the area of the inner and outer circumference with metal rings 12, 13 and seals them on the one hand on the inner housing 6 and on the other hand on the outer housing 1 is set. The rolling diaphragm 11 is mounted in the intermediate zone between the two metal rings 12, 13 on an underside, circular-shaped support cage with a U-shaped downward open profile, in which three support springs 14 which are evenly distributed over the circumference engage. The suspension springs are mounted on the underside of the support ring 15, which is axially immovably held in the outer housing 1 by the snap ring 16. By mutually adapting the outer diameter of the support ring 15 to the inner diameter of the housing 1, a precise mutual assignment in the radial direction is ensured. The support ring 15 can thereby give the support cage 17 and thus at the same time the rolling membrane 11 good guidance in the event of axial displacements.

Zur Funktion ist folgendes auszuführen:The following must be carried out for the function:

Bei dem gezeigten Tassenstößel ist die durch den ersten Hohlraum 2, durch die Durchtrittsöffnung 5, durch den zweiten Hohlraum 4, durch den dritten Hohlraum 7 und durch den Drosselspalt 9 umschlossene Kammer vollständig mit inkompressibler Flüssigkeit gefüllt. Die Federelastizität der Druckfeder 8 ist kleiner als diejenige der Schließfeder des zugehörigen Ventiles und in bezug auf die in der Kammer enthaltene Flüssigkeit von gleicher Wirkungsrichtung wie die Tragfedern 14. Bei nichtbetätigtem Ventil erreicht daher der dritte Hohlraum 7 sein maximales Füllvolumen, während das Außengehäuse 1 mit geringer Kraft an der Unterseite der Nockenwelle anliegt und das Innengehäuse 6 mit einer gleich großen Kraft am oberen Ende des zugehörigen Ventils. Dieses ist durch die Wirkung der Schließfeder fest verschlossen.In the cup tappet shown, the chamber enclosed by the first cavity 2, by the passage opening 5, by the second cavity 4, by the third cavity 7 and by the throttle gap 9 is completely filled with incompressible liquid. The spring elasticity of the compression spring 8 is less than that of the closing spring of the associated valve and, with respect to the liquid contained in the chamber, has the same direction of action as the suspension springs 14. When the valve is not actuated, the third cavity 7 therefore reaches its maximum filling volume, while the outer housing 1 also low force is applied to the underside of the camshaft and the inner housing 6 with an equally large force at the upper end of the associated valve. This is firmly closed by the action of the closing spring.

Gelangt bei weiterer Umdrehung der Nocken der Nockenwelle in Eingriff mit der Oberseite des Gehäuses 1, dann baut sich im Inneren des dritten Hohlraumes 7 ein Druck auf, was dazu führt, daß Leckflüssigkeit den Drosselspalt 7 in Richtung des ersten Hohlraumes 2 passiert und in denselben eingespeichert wird. Durch die kurze Zeitspanne der Krafteinwirkung des Nockens unter normalen Betriebsbedingungen führt dieser Fiüssigkeitsverlust indessen nicht zu einer nennenswerten Verminderung des in dem dritten Hohlraum 7 enthaltenen Flüssigkeitsvolumens, wodurch die ursprünglich vorhandene Abstützlänge zwischen dem oberen Ende des zugehörigen Ventils und der Nockenwelle im wesentlichen unverändert beibehalten wird. Die Verlagerung des Ventils ist dementsprechend und stimmt weitgehend mit der Exzentrizität des Nockens überein, wobei die Kraft der Schließfeder ohne weitere Bedeutung ist.If the cam of the camshaft engages with the top of the housing 1 during further rotation, then a pressure builds up in the interior of the third cavity 7, which leads to leakage liquid passing through the throttle gap 7 in the direction of the first cavity 2 and being stored therein becomes. Due to the short period of force of the cam under normal operating conditions, this loss of fluid does not lead to a significant reduction in the volume of liquid contained in the third cavity 7, whereby the originally existing support length between the upper end of the associated valve and the camshaft is maintained essentially unchanged. The displacement of the valve is accordingly and largely corresponds to the eccentricity of the cam, the force of the closing spring being of no further importance.

Bei weiterer Verdrehung der Nockenwelle gelangt der Nocken außer Eingriff, was dazu führt, daß das Ventil einschließlich des Tassenstößels durch die Kraft der Schließfeder zurück in die ursprüngliche Lage bewegt wird. Der Weg des Ventils ist dabei durch das Anschlagen an seinem Ventilsitz begrenzt, so daß sich zunächst ein gewisses Spiel zwischen der Nockenwelle und dem oberen Ende des Ventils ergibt. Die Kraft der Druckfeder 8 kommt jetzt wiederum zum Tragen und bewirkt eine Auseinanderbewegung zwischen dem Innengehäuse 6 und dem Hohlkolben 3 in axialer Richtung. Dabei strömt das während des Arbeitstaktes aus dem dritten Hohlraum 7 über den Drosselspalt 9 in den ersten Hohlraum 2 verdrängte Flüssigkeitsvolumen über die Durchtrittsöffnung 5, den zweiten Hohlraum 4 und das Rückschlagventil 10 zurück in den dritten Hohlraum 7, wodurch der ursprünglich vorhandene Betriebszustand wiederum erreicht ist. Der Vorgang wird durch die Tragfedern 14 zusätzlich beschleunigt.With further rotation of the camshaft, the cam disengages, which leads to the valve including the bucket tappet being moved back into the original position by the force of the closing spring. The path of the valve is limited by striking its valve seat, so that there is initially some play between the camshaft and the upper end of the valve. The force of the compression spring 8 now comes into play again and causes a movement apart between the inner housing 6 and the hollow piston 3 in the axial direction. The volume of liquid displaced from the third cavity 7 via the throttle gap 9 into the first cavity 2 during the working cycle flows through the passage opening 5, the second cavity 4 and the check valve 10 back into the third cavity 7, whereby the originally existing operating state is again achieved . The process is additionally accelerated by the suspension springs 14.

Gelangt der Motor zum Stillstand, während einer der vorhandenen Nocken im Eingriff steht, dann führt das zu einer allmählichen, entsprechenden Entleerung des dritten Hohlraumes 7 über dem Drosselspalt 9 in den ersten Hohlraum 2. Ergibt sich durch das anschließende Anlassen des Verbrennungsmotors eine Vergrößerung des Abstandes zwischen dem oberen Ende des Ventils und der Nockenwelle, dann hat das durch die Wirkung der Druckfeder 8 eine sofortige Auseinanderbewegung zwischen dem Innengehäuse 6 und dem Hohlkolben 3 in axialer Richtung zur Folge und die gleichzeitige Auffüllung des dritten Hohlraumes 7. Durch die Wirkung der Tragfedern 14 sind Kavitationserscheinungen auch bei schneller Drehung der Nockenwelle ausgeschlossen und es wird eine sofortige Funktionsbereitschaft des Tassenstößels erzielt. Bereits das erste nachfolgende Ineingriffgelangen des Nockens mit der Oberseite des Gehäuses führt daher zu einer richtigen Ventilbetätigung. Klappergeräusche und eventuelle Schäden am Motor werden daher sicher vermieden.If the engine comes to a standstill while one of the existing cams is in engagement, this leads to a gradual, corresponding emptying of the third cavity 7 above the throttle gap 9 into the first cavity 2. If the internal combustion engine is subsequently started, the distance increases between the upper end of the valve and the camshaft, then the effect of the compression spring 8 results in an immediate movement apart between the inner housing 6 and the hollow piston 3 in the axial direction and the simultaneous filling of the third cavity 7. By the action of the suspension springs 14 cavitation phenomena are excluded even when the camshaft rotates quickly and the tappet is immediately ready for operation. The first subsequent engagement of the cam with the top of the housing therefore leads to correct valve actuation. Rattling noises and possible damage to the engine are therefore safely avoided.

Claims (6)

1. A bucket tappet for the automatic valve play compensation of an internal combustion engine, comprising an external housing (1) having a first cavity (2), a hollow piston (3) arranged in the first cavity (2) and having a second cavity (4), a passage opening (5) between the first (2) and the second cavity (4), an internal housing (6) arranged on the hollow piston (3) and having a third cavity (7), the hollow piston (3) and the internal housing (6) being supported on one another by a compression spring (8) and together delimiting a choke gap (9), a nonreturn valve (8) permitting flow in the direction of the third cavity (7) being arranged between the second (4) and the third cavity (7), the chamber surrounded jointly by the passage opening (5), the choke gap (9), the external housing (1), the internal housing (6) and the hollow piston (3) being completely filled with incompressible fluid, the chamber being sealed off from the outside throughout by a fluid-impermeable boundary wall, the external housing, the hollow piston and the internal housing having a common axis and the boundary wall being designed, in at least one part region adjoining the first cavity (2) and surrounding the axis in the form of a ring, as a resiliently flexible diaphragm, the diaphragm resting, on the side facing away from the chamber, against a supporting cage in the form of a circular ring and the supporting cage being resiliently supported on the external housing (1) and pressed against the diaphragm, characterised in that the diaphragm is designed as a rolling diaphragm (11) and in that the supporting cage (17) is mounted on supporting springs (14) distributed uniformly on the periphery.
2. A bucket tappet according to claim 1, characterised in that the supporting cage (17) has a U-shaped profile and in that the limbs of the profile protrude at least partially into the intermediate zone between the supporting springs (14) and the rolling diaphragm (11).
3. A bucket tappet according to either of claims 1 and 2, characterised in that the supporting springs (14) are designed as helical springs and are arranged parallel to the direction of movement of the internal housing (6).
4. A bucket tappet according to any of claims 1-3, characterised in that the supporting cage (17) is composed of plastic.
5. A bucket tappet according to claim 4, characterised in that the plastic is reinforced by reinforcing elements.
6. A bucket tappet according to claim 5, characterised in that the rolling diaphragm (11) is reinforced in the regions resting against the bucket tappet by reinforcing rings (12, 13) of metallic material or plastic.
EP86114107A 1986-05-27 1986-10-11 Cup-shaped tappet Expired - Lifetime EP0247230B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114107T ATE51935T1 (en) 1986-05-27 1986-10-11 CUP PESTLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863617858 DE3617858A1 (en) 1986-05-27 1986-05-27 MUG PESTLE
DE3617858 1986-05-27

Publications (3)

Publication Number Publication Date
EP0247230A2 EP0247230A2 (en) 1987-12-02
EP0247230A3 EP0247230A3 (en) 1988-01-20
EP0247230B1 true EP0247230B1 (en) 1990-04-11

Family

ID=6301760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114107A Expired - Lifetime EP0247230B1 (en) 1986-05-27 1986-10-11 Cup-shaped tappet

Country Status (10)

Country Link
US (1) US4779583A (en)
EP (1) EP0247230B1 (en)
JP (1) JPS62279212A (en)
AT (1) ATE51935T1 (en)
BR (1) BR8701709A (en)
CA (1) CA1329523C (en)
DE (2) DE3617858A1 (en)
ES (1) ES2003512A6 (en)
MX (1) MX169474B (en)
NO (1) NO164194C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8902780U1 (en) * 1989-03-08 1989-04-20 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach Self-adjusting hydraulic valve tappet
GB2237858A (en) * 1989-11-11 1991-05-15 Gen Motors Luxembourg Operatio Valve-lash adjustment system.
DE4107041A1 (en) * 1991-03-06 1992-09-10 Freudenberg Carl Fa HYDRAULIC GAME COMPENSATION ELEMENT FOR A VALVE DRIVE
DE4125568A1 (en) * 1991-08-02 1993-02-04 Schaeffler Waelzlager Kg HYDRAULIC CUPS
DE4136746A1 (en) * 1991-11-08 1993-05-13 Schaeffler Waelzlager Kg Hydraulic tappet used in IC engine - has membranes actuated by piston to hold fluid volume constant
DE4203897C2 (en) * 1992-02-11 1994-01-27 Freudenberg Carl Fa Hydraulic valve lash adjuster
DE4209245A1 (en) * 1992-03-21 1993-09-23 Schaeffler Waelzlager Kg Self-adjusting cup tappet for vehicle IC engine - has pressure piston formed by spring covered with elastomer material
US5584268A (en) * 1994-12-27 1996-12-17 Ford Motor Company Low inertia rocker arm with lash adjuster and engine valve
US6723451B1 (en) * 2000-07-14 2004-04-20 3M Innovative Properties Company Aluminum matrix composite wires, cables, and method

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA504132A (en) * 1954-07-06 Oldberg Sidney Self-contained hydraulic tappet
JPS6010810B2 (en) * 1975-08-25 1985-03-20 株式会社日立製作所 Rolling mill plate thickness control method
US4397271A (en) * 1981-03-02 1983-08-09 Stanadyne, Inc. Semi-self-contained hydraulic lash adjuster
JPS6010810U (en) * 1983-07-04 1985-01-25 小田井鉄工株式会社 Sealed direct-seat hydraulic lifter for internal combustion engine valve mechanism
DE3347670A1 (en) * 1983-12-31 1985-07-11 Jörg 4800 Bielefeld Schwarzbich Hydraulic valve tappet
IT8467294A0 (en) * 1984-03-27 1984-03-27 Riv Officine Di Villar Perosa HYDRAULIC TAPPET TO CONTROL THE MOTION OF A VALVE OF AN ENDothermic Engine
IT1180083B (en) * 1984-07-24 1987-09-23 Riv Officine Di Villar Perosa WATERPROOF WATER TAPPET FOR THE CONTROL OF THE MOTOR OF A VALVE OF AN ENDOTHERMAL MOTOR
IT8454108V0 (en) * 1984-12-04 1984-12-04 Riv Officine Di Villar Perosa WATERPROOF WATER TAPPET FOR THE CONTROL OF THE MOTOR OF A VALVE OF AN ENDOTHERMAL MOTOR
DE3506730A1 (en) * 1985-02-26 1986-04-17 Daimler-Benz Ag, 7000 Stuttgart Hydraulic valve clearance adjustment element for internal combustion engines
DE3511501A1 (en) * 1985-03-29 1986-10-09 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt HYDRAULIC CUPS FOR COMBUSTION ENGINES
DE3513161A1 (en) * 1985-04-12 1986-10-16 Goetze Ag, 5093 Burscheid VALVE GAME COMPENSATION DEVICE

Also Published As

Publication number Publication date
JPS62279212A (en) 1987-12-04
JPH0553926B2 (en) 1993-08-11
DE3617858A1 (en) 1987-12-03
NO864505D0 (en) 1986-11-12
DE3617858C2 (en) 1989-05-18
ES2003512A6 (en) 1988-11-01
DE3670339D1 (en) 1990-05-17
NO164194C (en) 1990-09-05
CA1329523C (en) 1994-05-17
EP0247230A3 (en) 1988-01-20
ATE51935T1 (en) 1990-04-15
US4779583A (en) 1988-10-25
BR8701709A (en) 1988-01-26
MX169474B (en) 1993-07-07
NO164194B (en) 1990-05-28
EP0247230A2 (en) 1987-12-02
NO864505L (en) 1987-11-30

Similar Documents

Publication Publication Date Title
DE3203792C2 (en)
DE2813992C3 (en) Double tube type hydraulic shock absorber
DE2807391C2 (en) Piston rod guide for a hydraulic vehicle shock absorber
DE69300484T2 (en) A HYDRAULIC MASTER CYLINDER AND COLLECTOR ASSEMBLY.
DE3738298C2 (en) Length-adjustable gas spring for height-adjustable chairs
EP0247230B1 (en) Cup-shaped tappet
DE2264139A1 (en) HYDRAULIC SHOCK ABSORBER
DE3044460A1 (en) HYDROPNEUMATIC TWO TUBE VIBRATION DAMPER, ESPECIALLY AS A FRONT AXLE FOR MOTOR VEHICLES
DE2912687C3 (en) Valve closure member for the gas filling inlet of a hydraulic shock absorber of the double tube type
DE2435590B2 (en) Self-pumping hydropneumatic suspension strut with internal level control for vehicles
DE3824932C1 (en) Pneumatic spring damper unit
DE2257556C2 (en)
DE3109122C2 (en)
DE2912902A1 (en) HYDROPNEUMATIC TWO TUBE VIBRATION DAMPER, ESPECIALLY AS A FRONT AXLE FOR MOTOR VEHICLES
DE9315503U1 (en) Master cylinder
DE2052211A1 (en) Valve for compressor systems
DE2522714B2 (en) Control valve
DE3503216A1 (en) Brake cylinder
DE3513162C2 (en)
DE3506730A1 (en) Hydraulic valve clearance adjustment element for internal combustion engines
DE2533783C2 (en) Control valve for compressed air brakes, in particular for rail vehicles
DE2912615A1 (en) PRESSURE ACTUATED HYDRAULIC CONTROL VALVE
DE4340236C2 (en) Pump valve unit for a hydraulic cylinder
DE19702626C2 (en) Venting device for a two-pipe vibration damper
DE4412842C2 (en) Self-pumping hydropneumatic shock absorber with internal level control

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB IT LI NL SE

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19871204

17Q First examination report despatched

Effective date: 19880601

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 51935

Country of ref document: AT

Date of ref document: 19900415

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3670339

Country of ref document: DE

Date of ref document: 19900517

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 86114107.5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19960919

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19961001

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19961005

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19961007

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19961009

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19961010

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19961031

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970121

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970827

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971011

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971011

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971012

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971031

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19971031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971031

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971031

BERE Be: lapsed

Owner name: FIRMA CARL FREUDENBERG

Effective date: 19971031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19971011

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19980501

EUG Se: european patent has lapsed

Ref document number: 86114107.5

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051011