EP0223898B1 - Hydraulic lash adjusting device - Google Patents

Hydraulic lash adjusting device Download PDF

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Publication number
EP0223898B1
EP0223898B1 EP86102711A EP86102711A EP0223898B1 EP 0223898 B1 EP0223898 B1 EP 0223898B1 EP 86102711 A EP86102711 A EP 86102711A EP 86102711 A EP86102711 A EP 86102711A EP 0223898 B1 EP0223898 B1 EP 0223898B1
Authority
EP
European Patent Office
Prior art keywords
spherical
adjusting piston
sliding shoe
valve
valve stem
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
Application number
EP86102711A
Other languages
German (de)
French (fr)
Other versions
EP0223898A1 (en
Inventor
Walter Dipl.-Ing. Speil
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.)
Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
Original Assignee
Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
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 Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH filed Critical Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
Publication of EP0223898A1 publication Critical patent/EP0223898A1/en
Application granted granted Critical
Publication of EP0223898B1 publication Critical patent/EP0223898B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • 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
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L2001/187—Clips, e.g. for retaining rocker arm on pivot

Definitions

  • the invention relates to a hydraulic lash adjuster, in which a hydraulic compensation element is housed in a bore of a rocker arm or similar actuating element extending in the extension of the shaft of an engine valve, the longitudinally displaceable adjusting piston of which ends in a spherical projection towards the valve stem, between which and the flat end face of the valve stem Sliding shoe is arranged, which on the one hand has a spherical cap in which the spherical projection of the adjusting piston engages, and which on the other hand is supported with a flat surface on the end face of the valve stem.
  • sliding shoes serve to create contact surfaces between the adjusting piston on the one hand and the valve stem on the other hand, by means of which wear is reduced and the lubrication conditions are improved.
  • a sliding block is simply inserted between the spherical projection of the adjusting piston and the end face of the valve stem, where it is held in place during operation by the meshing of the spherical projection and the spherical cap.
  • such a slide shoe has already been provided with a captive lock by allowing it to engage with a flanged edge in a circumferential groove in the valve stem. As a result, it is securely attached to the end of the valve stem when the rocker arms are removed and cannot be lost.
  • the disadvantage here is that the engine manufacturer has to keep different valves in stock if he also produces valve controls with mechanical valve clearance adjustment in addition to valve controls with hydraulic lash adjusters (DE-OS 33 04 398).
  • Brackets for such sliding shoes have also already been made, which are to be regarded as a kind of reversal of the previously described embodiment, in which the sliding shoe engages behind a reduction in diameter of the spherical projection on the adjusting piston with a flange.
  • the invention has for its object to provide a secure mounting of the slide shoe on the hydraulic compensating element, without the need for an extension of the adjusting piston, and without changes to the valve stem being required.
  • a cage part extends from a point lying behind the ball projection, which extends in the direction of the valve stem and ends there in radially inwardly directed holding zones which cover the outer lateral surface of the slide shoe or projections of this lateral surface in such a way reach behind that the sliding shoe is held captive against the adjusting piston with free angular mobility.
  • a hydraulic compensating element 2 is mounted in the rocker arm 1 in a known manner, the adjusting piston 3 of which ends in a ball projection 5 at its end facing the valve stem 4.
  • the sliding block 7 is arranged, in whose spherical cap 8 the spherical projection 5 of the adjusting piston 3 engages, and the flat end face 9 of which cooperates with the end face 6 of the valve stem 4.
  • the outer surface of the sliding shoe 7 has a radially projecting collar 10 at its end facing the adjusting piston 3.
  • a cage part 11 is molded into its circumferential groove 12 at its upper end for attachment to the adjusting piston 3.
  • the cage part 11 is drawn in to the holding zones 13, which lie on an inner diameter which is smaller than the diameter of the collar 10.
  • the distance of the holding zones 13 from the collar 10 in the axial direction is chosen so that the slide shoe 7 can pivot within the angular movements occurring during operation without hitting the holding zones 13. In this way, a secure mounting of the slide shoe 7 is ensured without its free adjustability being hindered by any adjacent components.
  • the variant of the subject of the application shown in FIG. 2 differs from that of FIG. 1 only in that the slide shoe 14 provided here has an outer circumferential surface 15 which is formed as part of a spherical surface, the center of which coincides with the center of the spherical projection 5.
  • the holding zones 13 of the cage part 11 end below the transverse plane 16 passing through the center of the spherical projection, as a result of which secure holding of the sliding block 14 and its free angular mobility is ensured.

Description

Die Erfindung betrifft eine hydraulische Spielausgleichsvorrichtung, bei der in einer in Verlängerung des Schaftes eines Motorventils verlaufenden Bohrung eines Kipphebels oder ähnlichen Betätigungsorganes ein hydraulisches Ausgleichselement untergebracht ist, dessen längsverschiebbarer Einstellkolben zum Ventilschaft hin in einem Kugelvorsprung endet, zwischen dem und der planen Stirnfläche des Ventilschaftes ein Gleitschuh angeordnet ist, der einerseits eine Kugelkalotte aufweist, in die der Kugelvorsprung des Einstellkolbens eingreift, und der andererseits sich mit einer Planfläche an der Stimfläche des Ventilschaftes abstützt.The invention relates to a hydraulic lash adjuster, in which a hydraulic compensation element is housed in a bore of a rocker arm or similar actuating element extending in the extension of the shaft of an engine valve, the longitudinally displaceable adjusting piston of which ends in a spherical projection towards the valve stem, between which and the flat end face of the valve stem Sliding shoe is arranged, which on the one hand has a spherical cap in which the spherical projection of the adjusting piston engages, and which on the other hand is supported with a flat surface on the end face of the valve stem.

Die Anordnung derartiger Gleitschuhe ist bekannt. Sie dienen dazu, zwischen dem Einstellkolben einerseits und dem Ventilschaft andererseits Berührungsflächen zu schaffen, durch welche der Verschleiß vermindert und die Schmierverhältnisse verbessert werden. Bei einer bekannten Ausführung ist ein solcher Gleitschuh einfach zwischen den Kugelvorsprung des Einstellkolbens und die Stirnfläche des Ventilschaftes eingelegt, wo er während des Betriebes durch das Ineinandergreifen von Kugelvorsprung und Kalotte an Ort und Stelle gehalten wird. Bei der Demontage der Kipphebei besteht jedoch die Gefahr, daß der Gleitschuh in den Motorblock fällt, von wo er nur sehr schwierig wieder entfernt werden kann (DE-OS 31 18 466).The arrangement of such sliding shoes is known. They serve to create contact surfaces between the adjusting piston on the one hand and the valve stem on the other hand, by means of which wear is reduced and the lubrication conditions are improved. In a known embodiment, such a sliding block is simply inserted between the spherical projection of the adjusting piston and the end face of the valve stem, where it is held in place during operation by the meshing of the spherical projection and the spherical cap. When dismantling the tipping hoist, however, there is a risk that the slide shoe will fall into the engine block, from where it can be removed only with great difficulty (DE-OS 31 18 466).

Bei einer anderen Ausführung hat man einen solchen Gleitschuh bereits mit einer Verliersicherung versehen, indem man ihn mit einem umgebördelten Rand in eine umlaufende Nut des Ventilschaftes eingreifen ließ. Dadurch ist er auch bei der Demontage der Kipphebel sicher am Ventilschaftende befestigt und kann nicht verlorengehen. Nachteilig ist hierbei, daß der Motorenhersteller unterschiedliche Ventile auf Lager halten muß, wenn er neben Ventilsteuerungen mit hydraulischen Spielausgleichsvorrichtungen auch Ventilsteuerungen mit mechanischer Ventilspieleinstellung herstellt (DE-OS 33 04 398).In another embodiment, such a slide shoe has already been provided with a captive lock by allowing it to engage with a flanged edge in a circumferential groove in the valve stem. As a result, it is securely attached to the end of the valve stem when the rocker arms are removed and cannot be lost. The disadvantage here is that the engine manufacturer has to keep different valves in stock if he also produces valve controls with mechanical valve clearance adjustment in addition to valve controls with hydraulic lash adjusters (DE-OS 33 04 398).

Es wurden auch schon Halterungen für derartige Gleitschuhe ausgeführt, die als eine Art Umkehrung der vorher beschriebenen Ausführung anzusehen sind, bei der nämlich der Gleitschuh mit einer Einbördelung hinter eine Durchmesserverringerung des Kugelvorsprungs am Einstellkolben greift. Diese bedingt jedoch, daß der Kugelvorsprung am Einstellkolben deutlich verlängert werden muß, um den axial erforderlichen Raum für diese Durchmesserverringerung zu schaffen. Diese zusätzlich erforderliche Einbaulänge steht jedoch in vielen Fällen nicht zur Verfügung.Brackets for such sliding shoes have also already been made, which are to be regarded as a kind of reversal of the previously described embodiment, in which the sliding shoe engages behind a reduction in diameter of the spherical projection on the adjusting piston with a flange. However, this means that the ball projection on the adjusting piston must be extended significantly in order to create the axially required space for this diameter reduction. In many cases, however, this additional installation length is not available.

Der Erfindung liegt die Aufgabe zugrunde, eine sichere Halterung des Gleitschuhs am hydraulischen Ausgleichselement zu schaffen, ohne daß es einer Verlängerung des Einstellkolbens bedürfte, und ohne daß Änderungen am Ventilschaft erforderlich sind.The invention has for its object to provide a secure mounting of the slide shoe on the hydraulic compensating element, without the need for an extension of the adjusting piston, and without changes to the valve stem being required.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß am Einstellkolben von einer hinter dem Kugelvorsprung liegenden Stelle ein Käfigteil ausgeht, das sich in Richtung zum Ventilschaft erstreckt und dort in radial einwärts gerichteten Haltezonen endet, die die Außenmantelfläche des Gleitschuhes bzw. Vorsprünge dieser Mantelfläche derart hintergreifen, daß der Gleitschuh bei freier Winkelbeweglichkeit gegenüber dem Einstellkolben verliersicher an diesem gehalten ist.This object is achieved according to the invention in that on the adjusting piston a cage part extends from a point lying behind the ball projection, which extends in the direction of the valve stem and ends there in radially inwardly directed holding zones which cover the outer lateral surface of the slide shoe or projections of this lateral surface in such a way reach behind that the sliding shoe is held captive against the adjusting piston with free angular mobility.

In den Unteransprüchen sind vorteilhafte Ausgestaltungen der erfindungsgemäßen Vorrichtung wiedergegeben.Advantageous refinements of the device according to the invention are given in the subclaims.

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

In Fig. 1 ist in dem Kipphebel 1 in bekannter Weise ein hydraulisches Ausgleichselement 2 gelagert, dessen Einstellkolben 3 an seinem dem Ventilschaft 4 zugekehrten Ende in einem Kugelvorsprung 5 endet. Zwischen diesem Kugelvorsprung 5 und der planen Stirnfläche 6 des Ventilschaftes 4 ist der Gleitschuh 7 angeordnet in dessen Kugelkalotte 8 der Kugelvorsprung 5 des Einstellkolbens 3 eingreift, und dessen plane Stirnfläche 9 mit der Stirnfläche 6 des Ventilschaftes 4 zusammenwirkt.In Fig. 1, a hydraulic compensating element 2 is mounted in the rocker arm 1 in a known manner, the adjusting piston 3 of which ends in a ball projection 5 at its end facing the valve stem 4. Between this spherical projection 5 and the flat end face 6 of the valve stem 4, the sliding block 7 is arranged, in whose spherical cap 8 the spherical projection 5 of the adjusting piston 3 engages, and the flat end face 9 of which cooperates with the end face 6 of the valve stem 4.

Die äußere Mantefläche des Gleitschuhes 7 weist an ihrem dem Einstellkolben 3 zugewandten Ende einen radial vorspringenden Bund 10 auf. Ein Käfigteil 11 ist zu seiner Befestigung am Eintellkolben 3 an seinem oberen Ende in die Umfangsnut 12 eingeformt. An seinem unteren Ende ist das Käfigteil 11 zu den Haltezonen 13 eingezogen, die auf einem Innendurchmesser liegen, der kleiner ist, als der Durchmesser des Bundes 10. Der Abstand der Haltezonen 13 von dem Bund 10 in axialer Richtung ist so gewählt, daß der Gleitschuh 7 innerhalb der im Betrieb auftretenden Winkelbewegungen schwenken kann, ohne an den Haltezonen 13 anzustoßen. Auf diese Weise ist eine sichere Halterung des Gleitschuhes 7 gewährleistet, ohne daß dessen freie Einstellbarkeit durch irgendwelche angrenzenden Bauteile behindert wäre.The outer surface of the sliding shoe 7 has a radially projecting collar 10 at its end facing the adjusting piston 3. A cage part 11 is molded into its circumferential groove 12 at its upper end for attachment to the adjusting piston 3. At its lower end, the cage part 11 is drawn in to the holding zones 13, which lie on an inner diameter which is smaller than the diameter of the collar 10. The distance of the holding zones 13 from the collar 10 in the axial direction is chosen so that the slide shoe 7 can pivot within the angular movements occurring during operation without hitting the holding zones 13. In this way, a secure mounting of the slide shoe 7 is ensured without its free adjustability being hindered by any adjacent components.

Die in Fig. 2 dargestellte Variante des Anmeldungsgegenstandes unterscheidet sich von der nach Fig. 1 lediglich dadurch, daß der hier vorgesehene Gleitschuh 14 eine äußere Mantelfläche 15 aufweist, die als Teil einer Kugeloberfläche ausgebildet ist, deren Mittelpunkt mit dem Mittelpunkt des Kugelvorsprunges 5 zusammenfällt. Die Haltezonen 13 des Käfigteiles 11 enden unterhalb der durch den Mittelpunkt des Kugelvorsprunges gehenden Querebene 16, wodurch eine sichere Halterung des Gleitschuhes 14 ebenso wie dessen freie Winkelbeweglichkeit gewährleistet ist.The variant of the subject of the application shown in FIG. 2 differs from that of FIG. 1 only in that the slide shoe 14 provided here has an outer circumferential surface 15 which is formed as part of a spherical surface, the center of which coincides with the center of the spherical projection 5. The holding zones 13 of the cage part 11 end below the transverse plane 16 passing through the center of the spherical projection, as a result of which secure holding of the sliding block 14 and its free angular mobility is ensured.

Um die angestrebte Funktion zu erfüllen, ist es nicht unbedingt erforderlich, daß sich der Bund 10 oder die Kugelfläche 15 über den gesamten Umfang des Gleitschuhes erstrecken. Es genügt vielmehr, wenn z. B. drei um jeweils 120° versetzte Vorsprünge vorgesehen sind. Dasselbe gilt sinngemäß für die Haltezonen 13 des Käfigteiles 11.In order to fulfill the desired function, it is not absolutely necessary for the collar 10 or the spherical surface 15 to extend over the entire circumference of the sliding block. Rather, it is sufficient if, for. B. three projections offset by 120 ° are provided. The same applies analogously to the holding zones 13 of the cage part 11.

Claims (4)

1. Hydraulic valve clearance adjusting device in which a hydraulic clearance adjuster (2) is lodged in a bore of a rocker arm (1) or similar actuating element which bore lies in the produced axis of the stem (4) of an engine valve, the longitudinally displaceable adjusting piston (3) of the hydraulic clearance adjuster (2) at its end towards the valve stem, (4) ending in a spherical projection (5), between which projection (5) and the plane end face (6) of the valve stem (4) a sliding shoe (7, 14) is arranged, which, on one side has a spherical depression (8) in which the spherical projection (5) of the adjusting piston (3) engages and on the other, a plane surface (9) bearing on the end face (6) of the valve stem (4), characterized in that on the adjusting piston (3) a cage element (11) starting from a location behind the spherical projection (5) extends in the direction of the valve stem (4) and ends there in radially inwards directed retaining zones (13) which engage behind the outer peripheral surface (15) of the sliding shoe (7, 14) or behind projections (10) of this surface as the case may be, in such a way, that, whereas free angular motion of the sliding shoe with respect to the adjusting piston (3) is possible, the sliding shoe is retained on the adjusting piston secure against loss.
2. Valve clearance adjusting device according to Claim 1, characterized in that the outer peripheral surface (15) of the sliding shoe (14) has the shape of a part of a spherical surface whose centre coincides preferably with the centre of the spherical depression (8) and in that, a cage element (11) is secured to the adjusting piston (3) at a location behind the spherical projection (5), and extends in the direction of the valve stem (4) to behind a transverse plane (16) traversing the centre of the spherical depression (8) and has retaining zones (13) there which lie on a diameter which is smaller than the diameter of the spherical outer surface (15) of the sliding shoe (14).
3. Valve clearance adjusting device according to Claim 1 or 2, characterized in that the cage element (11) is essentially a cylindrical component which for securing it to the adjusting piston (3) engages at one end in a peripheral groove (12) of this piston (3) and at the other end is drawn in to a smaller diameter.
4. Valve clearance adjusting device according to Claim 3, characterized in that the cage element (11), starting from the end at which it is drawn in to a smaller diameter has several longitudinal slits over a part of its length distributed around its periphery which thus form detached retaining fingers.
EP86102711A 1985-11-21 1986-03-01 Hydraulic lash adjusting device Expired EP0223898B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853541198 DE3541198A1 (en) 1985-11-21 1985-11-21 HYDRAULIC GAME COMPENSATION DEVICE
DE3541198 1985-11-21

Publications (2)

Publication Number Publication Date
EP0223898A1 EP0223898A1 (en) 1987-06-03
EP0223898B1 true EP0223898B1 (en) 1989-11-08

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ID=6286493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102711A Expired EP0223898B1 (en) 1985-11-21 1986-03-01 Hydraulic lash adjusting device

Country Status (4)

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US (1) US4708103A (en)
EP (1) EP0223898B1 (en)
JP (1) JPH0668241B2 (en)
DE (2) DE3541198A1 (en)

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Also Published As

Publication number Publication date
EP0223898A1 (en) 1987-06-03
US4708103A (en) 1987-11-24
DE3666857D1 (en) 1989-12-14
JPS62126211A (en) 1987-06-08
DE3541198A1 (en) 1987-05-27
JPH0668241B2 (en) 1994-08-31

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