EP0244558B1 - Hydraulic valve lash adjusting device for an internal-combustion engine - Google Patents

Hydraulic valve lash adjusting device for an internal-combustion engine Download PDF

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Publication number
EP0244558B1
EP0244558B1 EP87100988A EP87100988A EP0244558B1 EP 0244558 B1 EP0244558 B1 EP 0244558B1 EP 87100988 A EP87100988 A EP 87100988A EP 87100988 A EP87100988 A EP 87100988A EP 0244558 B1 EP0244558 B1 EP 0244558B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve stem
adjusting device
cylindrical collar
sliding shoe
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
EP87100988A
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German (de)
French (fr)
Other versions
EP0244558A1 (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 EP0244558A1 publication Critical patent/EP0244558A1/en
Application granted granted Critical
Publication of EP0244558B1 publication Critical patent/EP0244558B1/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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F01L1/46—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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/10—Connecting springs to valve members

Definitions

  • the invention relates to a hydraulic valve lash compensation device for internal combustion engines, 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 convex projection towards the valve stem, between the and the flat end face the valve stem a sliding block is arranged, which on the one hand has a spherical cap, in which the spherical projection of the adjusting piston engages, and on the other hand is supported with a flat surface on the end face of the valve stem, while at the same time being held captively on 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 shoe 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 calotte.
  • 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. This means that it is securely attached to the end of the valve stem when the rocker arm is 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).
  • EP-A 0 233 898 belongs to the state of the art according to Art. 54 (3).
  • the invention has for its object to provide a secure mounting of the slide shoe on the valve stem, without it being necessary to keep different valves in stock, and without changes to the valve stem are required.
  • a cage part is arranged on the valve stem or a part connected to it, which extends in the direction of the adjusting piston and ends there in radially inwardly directed holding zones which cover the outer surface of the slide shoe or projections of this surface reach behind that the slide shoe is held captive against the valve stem with free transverse displacement. If necessary, this cage part can be arranged on the valve stem, or on parts connected to it, without changes to the valve stem being necessary.
  • a hydraulic lash adjuster 2 is mounted in the rocker arm 1 in a known manner, the adjusting piston 3 of which ends in a spherical projection 5 at its end facing the valve stem 4.
  • the valve stem 4 is surrounded by the valve spring 6, which is supported on the spring plate 7, which is fastened to the valve stem 4 by means of the valve wedges 8.
  • the sliding block 9 is arranged, in the spherical cap 10 of which the spherical projection 5 of the adjusting piston 3 engages, and the flat end face 11 of which cooperates with the end face of the valve stem 4.
  • the outer lateral surface of the sliding block 9 has a radial projection 12.
  • a cage part 13 is arranged at the end of the valve stem 4, which consists of the cylindrical collar 14, which extends in the direction of the adjusting piston 3, and which ends behind the projection 12 in radially directed holding zones 15 which engage behind the projection 12 so that the Slide shoe 9 can move freely across the valve stem 4, but is held captive on it.
  • the cylindrical collar 14 of the cage part 13 merges with a radial flange 16 into a hollow cylinder 17, which is pressed onto the end of the valve stem 4 in a force-fitting manner.
  • FIG. 2 shows an embodiment in which the cylindrical collar 18 and the radial holding zones 19 formed thereon are formed directly on the valve wedge 8.
  • FIG. 3 on the other hand, only a cylindrical collar 20 is formed on the valve wedge 8, onto which a sheet metal flange 21 is positively placed, which forms the radial holding zone.
  • a cylindrical collar 22 with the radial holding zones 23 is molded directly onto the valve plate 7.
  • valve plate 7 again shows a variant in which only a cylindrical collar 24 is formed on the valve plate 7, which carries a form-fitting sheet metal flange 25 which forms the holding zones.
  • holding zones are always designed as radial ring flanges, as shown in the figures. Rather, it is sufficient if these holding flanges are formed only as individual holding zones which extend over part of their circumference.

Description

Die Erfindung betrifft eine hydraulische Ventilspielausgleichsvorrichtung für Verbrennungsmotoren, 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 balligen Vorsprung endet, zwischen dem und der planen Stirnfläche des Ventilschaftes ein Gleitschuh angeordnet ist, der einerseits eine Kugelkalotte aufweist, in die der ballige Vorsprung des Einstellkolbens eingreift, und der andererseits sich mit einer Planfläche an der Stirnfläche des Ventilschaftes abstützt, wobei er gleichzeitig verliersicher am Ventilschaft gehalten ist.The invention relates to a hydraulic valve lash compensation device for internal combustion engines, 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 convex projection towards the valve stem, between the and the flat end face the valve stem a sliding block is arranged, which on the one hand has a spherical cap, in which the spherical projection of the adjusting piston engages, and on the other hand is supported with a flat surface on the end face of the valve stem, while at the same time being held captively on 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 balligen Vorsprung des Einstellkolbens und die Stirnfläche des Ventilschaftes eingelegt, wo er während des Betriebes durch das Ineinandergreifen des balligen Vorsprunges und der Kalotte an Ort und Stelle gehalten wird. Bei der Demontage der Kipphebel besteht jedoch die Gefahr, daß der Gleitschuh in den Motorblock fällt, von wo er nur sehr schwierig wieder entfernt werden kann (DE-OS 31 18466).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 shoe 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 calotte. When dismantling the rocker arm, however, there is a risk that the slide shoe falls into the engine block, from where it can be removed only with great difficulty (DE-OS 31 18466).

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 des Kipphebels sicher am Ventilschaftende befestigt und kann nicht verloren gehen. 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. This means that it is securely attached to the end of the valve stem when the rocker arm is 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).

Zum Stand der Technik gemäß Art. 54 (3) gehört das EP-A 0 233 898.EP-A 0 233 898 belongs to the state of the art according to Art. 54 (3).

Der Erfindung liegt die Aufgabe zugrunde, eine sichere Halterung des Gleitschuhes am Ventilschaft zu schaffen, ohne daß es hierzu erforderlich ist, unterschiedliche Ventile auf Lager halten zu müssen, 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 valve stem, without it being necessary to keep different valves in stock, and without changes to the valve stem are required.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß am Ventilschaft oder einem mit diesem verbundenen Teil ein Käfigteil angeordnet ist, das sich in Richtung zum Einstellkolben 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 Querverschiebbarkeit gegenüber dem Ventilschaft verliersicher an diesen gehalten ist. Dieses Käfigteil kann im Bedarfsfalle am Ventilschaft, oder an mit diesem verbundenen Teilen angeordnet werden, ohne daß Änderungen am Ventilschaft erforderlich sind.This object is achieved according to the invention in that a cage part is arranged on the valve stem or a part connected to it, which extends in the direction of the adjusting piston and ends there in radially inwardly directed holding zones which cover the outer surface of the slide shoe or projections of this surface reach behind that the slide shoe is held captive against the valve stem with free transverse displacement. If necessary, this cage part can be arranged on the valve stem, or on parts connected to it, without changes to the valve stem being necessary.

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 Ausführungsbeispiele des Erfindung dargestellt. Es zeigen:

  • Fig. 1 einen Längsschnitt durch einen Teil eines Kipphebels und das diesem zugewandte Ende eines Ventilschaftes und
  • Fig. 2 bis 5 weitere Möglichkeiten der Halterung eines Gleitschuhes am Ventilschaftende im Längsschnitt.
Exemplary embodiments of the invention are shown in the drawings. Show it:
  • Fig. 1 shows a longitudinal section through part of a rocker arm and the end of a valve stem facing it and
  • Fig. 2 to 5 other ways of holding a slide shoe at the valve stem end in longitudinal section.

Bei der in Fig. 1 dargestellten Ausführung ist in dem Kipphebel 1 in bekannter Weise ein hydraulisches Spielausgleichselement 2 gelagert, dessen Einstellkolben 3 an seinem dem Ventilschaft 4 zugekehrten Ende in einem balligen Vorsprung 5 endet. Den Ventilschaft 4 umgibt die Ventilfeder 6, die sich an dem Federteller 7 abstützt, der mittels der Ventilkeile 8 am Ventilschaft 4 befestigt ist.In the embodiment shown in FIG. 1, a hydraulic lash adjuster 2 is mounted in the rocker arm 1 in a known manner, the adjusting piston 3 of which ends in a spherical projection 5 at its end facing the valve stem 4. The valve stem 4 is surrounded by the valve spring 6, which is supported on the spring plate 7, which is fastened to the valve stem 4 by means of the valve wedges 8.

Zwischen dem balligen Vorsprung 5 und der planen Stirnfläche des Ventilschaftes 4 ist der Gleitschuh 9 angeordnet, in dessen Kugelkalotte 10 der ballige Vorsprung 5 des Einstellkolbens 3 eingreift, und dessen plane Stirnfläche 11 mit der Stirnfläche des Ventilschaftes 4 zusammenwirkt.Between the spherical projection 5 and the flat end face of the valve stem 4, the sliding block 9 is arranged, in the spherical cap 10 of which the spherical projection 5 of the adjusting piston 3 engages, and the flat end face 11 of which cooperates with the end face of the valve stem 4.

Die äußere Mantelfläche des Gleitschuhes 9 weist einen radialen Vorsprung 12 auf. Ein Käfigteil 13 ist am Ende des Ventilschaftes 4 angeordnet, welches aus dem zylindrischen Kragen 14 besteht, der sich in Richtung des Einstellkolbens 3 erstreckt, und der hinter dem Vorsprung 12 in radial gerichteten Haltezonen 15 endet, welche den Vorsprung 12 so hintergreifen, daß der Gleitschuh 9 sich zwar quer zum Ventilschaft 4 frei bewegen kann, jedoch verliersicher an diesem gehalten ist. Zur Befestigung am Ventilschaft 4 geht der zylindrische Kragen 14 des Käfigteiles 13 mit einem Radialflansch 16 in einen Hohlzylinder 17 über, welcher kraftschlüssig auf das Ende des Ventilschaftes 4 aufgepreßt ist.The outer lateral surface of the sliding block 9 has a radial projection 12. A cage part 13 is arranged at the end of the valve stem 4, which consists of the cylindrical collar 14, which extends in the direction of the adjusting piston 3, and which ends behind the projection 12 in radially directed holding zones 15 which engage behind the projection 12 so that the Slide shoe 9 can move freely across the valve stem 4, but is held captive on it. For attachment to the valve stem 4, the cylindrical collar 14 of the cage part 13 merges with a radial flange 16 into a hollow cylinder 17, which is pressed onto the end of the valve stem 4 in a force-fitting manner.

In den folgenden Figuren sind Ausführungen dargestellt, bei denen das Käfigteil nicht am Ventilschaft, sondern vielmehr an mit diesem verbundenen Teilen angeordnet ist.The following figures show designs in which the cage part is not arranged on the valve stem, but rather on parts connected to it.

In Fig 2 ist eine Ausführung gezeigt, bei der der zylindrische Kragen 18 und die an diesen angeformten radialen Haltezonen 19 unmittelbar an den Ventilkeil 8 angeformt sind. Bei der in Figur 3 dargestellten Ausführung ist dagegen nur ein zylindrischer Kragen 20 an den Ventilkeil 8 angeformt, auf den formschlüssig ein Blechflansch 21 aufgesetzt ist, welcher die radiale Haltezone bildet.FIG. 2 shows an embodiment in which the cylindrical collar 18 and the radial holding zones 19 formed thereon are formed directly on the valve wedge 8. In the embodiment shown in FIG. 3, on the other hand, only a cylindrical collar 20 is formed on the valve wedge 8, onto which a sheet metal flange 21 is positively placed, which forms the radial holding zone.

Bei der in Fig. 4 gezeigten Ausführung ist ein zylindrischer Kragen 22 mit den radialen Haltezonen 23 unmittelbar an den Ventilteller 7 angeformt.In the embodiment shown in FIG. 4, a cylindrical collar 22 with the radial holding zones 23 is molded directly onto the valve plate 7.

Fig. 5 zeigt wiederum eine Variante, bei welcher an den Ventilteller 7 nur ein zylindrischer Kragen 24 angeformt ist, der einen formschlüssig aufgesetzten Blechflansch 25 trägt, welcher die Haltezonen bildet.5 again shows a variant in which only a cylindrical collar 24 is formed on the valve plate 7, which carries a form-fitting sheet metal flange 25 which forms the holding zones.

Es ist nicht erforderlich, daß die Haltezonen stets als Radialringflansche ausgebildet sind, wie es in den Figuren dargestellt ist. Es genügt vielmehr, wenn diese Halteflansche nur als einzelne sich über einen Teil ihres Umfanges erstreckende Haltezonen ausgebildet sind.It is not necessary that the holding zones are always designed as radial ring flanges, as shown in the figures. Rather, it is sufficient if these holding flanges are formed only as individual holding zones which extend over part of their circumference.

Claims (7)

1. Hydraulic valve clearance adjusting device for internal combustion engines, in which a hydraulic clearance adjuster is lodged in a bore of a rocker arm or similar actuating element, which bore lies in the produced axis of the stem, of an engine valve, the longitudinally displaceable adjusting piston of the hydraulic clearance adjuster at its end towards the valve stem ending in a spherical projection, between which projection and the plane end face of the valve stem a sliding shoe is arranged, which, on one side, has a spherical depression in which the spherical projection of the adjusting piston engages and on the other, a plane surface, bearing on the end face of the valve stem, the shoe being retained at the same time against the valve stem secure against loss characterized in that on the valve stem (4) or on a part (7, 8) connected with it, a cage element (13) is arranged which extends towards the adjusting piston (3) and ends there in radially inwards directed retaining zones (15, 19, 23) which engage behind the outer peripheral surface of the sliding shoe (9) or the projections (12) as the case may be, in such a way, that, whilst the sliding shoe (9) is freely displaceable crosswise with respect to the valve stem (4), it is retained on this so that it cannot be lost.
2. Valve clearance adjusting device according to Claim 1, characterized in that the cage element (13) comprises a cylindrical collar (14, 18, 20, 22, 24) whose inner diameter is larger than the largest outer diameter of the sliding shoe (9) and which at its end towards the adjusting piston (3) has radially inwards directed retaining zones (15, 19, 23) which engage axially behind the largest outer diameter of the sliding shoe (9) with play.
3. Valve clearance adjusting device according to Claim 2, characterized in that the cylindrical collar (14) has a radial flange (16) at its end towards the valve stem (4), which flange continues into a hollow cylinder (17) force-fitted or interlocked on the end of the valve stem (4).
4. Valve clearance adjusting device according to Claim 2, characterized in that the cylindrical collar (22, 24) is a part of a valve disk (7) which is interlocked with the valve stem (4) by means of valve collets (8).
5. Valve clearance adjusting device according to Claim 2, characterized in that the cylindrical collar (18, 20) is made up of individual segments which are parts of the valve collets (8).
6. Valve clearance adjusting device according to Claim 4 or 5, characterized in that the cylindrical collar (14, 18, 22) has retaining zones (15, 19, 23) integrally formed on it.
7. Valve clearance adjusting device according to Claim 4 or 5, characterized in that the retaining zones are formed by a sheet metal flange (21, 25) which is interlocked or force-fitted on the cylindrical collar (20, 24).
EP87100988A 1986-04-26 1987-01-24 Hydraulic valve lash adjusting device for an internal-combustion engine Expired EP0244558B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614258 1986-04-26
DE19863614258 DE3614258A1 (en) 1986-04-26 1986-04-26 HYDRAULIC VALVE COMPENSATION COMPENSATION DEVICE FOR COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0244558A1 EP0244558A1 (en) 1987-11-11
EP0244558B1 true EP0244558B1 (en) 1989-11-08

Family

ID=6299652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100988A Expired EP0244558B1 (en) 1986-04-26 1987-01-24 Hydraulic valve lash adjusting device for an internal-combustion engine

Country Status (6)

Country Link
US (1) US4729350A (en)
EP (1) EP0244558B1 (en)
JP (1) JPS62261608A (en)
BR (1) BR8701961A (en)
DE (2) DE3614258A1 (en)
ES (1) ES2012059B3 (en)

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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
DE3760966D1 (en) 1989-12-14
BR8701961A (en) 1988-02-02
EP0244558A1 (en) 1987-11-11
DE3614258A1 (en) 1987-10-29
JPS62261608A (en) 1987-11-13
JPH0452846B2 (en) 1992-08-25
US4729350A (en) 1988-03-08
ES2012059B3 (en) 1990-03-01

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