EP0586871B1 - Valve drive for internal combustion engine - Google Patents

Valve drive for internal combustion engine Download PDF

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Publication number
EP0586871B1
EP0586871B1 EP93112218A EP93112218A EP0586871B1 EP 0586871 B1 EP0586871 B1 EP 0586871B1 EP 93112218 A EP93112218 A EP 93112218A EP 93112218 A EP93112218 A EP 93112218A EP 0586871 B1 EP0586871 B1 EP 0586871B1
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EP
European Patent Office
Prior art keywords
valve
valve drive
drive according
support part
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 - Lifetime
Application number
EP93112218A
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German (de)
French (fr)
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EP0586871A1 (en
Inventor
Norbert Hemmerlein
Thomas Kannen
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Publication date
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0586871A1 publication Critical patent/EP0586871A1/en
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Publication of EP0586871B1 publication Critical patent/EP0586871B1/en
Anticipated expiration legal-status Critical
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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
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • 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 valve train according to the preamble of patent claim 1.
  • a spring plate which is made of ferrous metal material and has a conical hub part surrounding the valve stem and a support part for the compression spring running transversely to the valve stem. Both the hub part and the support part are dimensioned such that the forces that occur are absorbed when using an iron-metallic material for this spring plate.
  • Spring plates made of plastic are known from US-A-4,432,311.
  • the object of the invention is to optimize a valve train of an internal combustion engine in the direction of mechanical efficiency.
  • the components of the valve train that are particularly suitable for further development due to their constructive structure, e.g. Spring plate, special attention should be paid.
  • the main advantages achieved with the invention are that the moving masses of the valve train are reduced with the aim of reducing the spring forces of the compression spring and thus the friction between the camshaft and the tappet. This improves both mechanical efficiency and fuel consumption.
  • One component that can be optimized in a relatively simple manner with regard to moving masses is the Spring plate, which rests adjacent to the free end of the valve stem, namely when it is made of a plastic, preferably glass fiber reinforced type.
  • stresses must be reduced or deflections of the support part must be kept within defined limits. It is also important to avoid material accumulation so that the end product "spring plate made of plastic" is free of voids.
  • the centering function of the spring plate for the compression spring must also be taken into account.
  • the first cross-sectional enlargement on the hub part and the second cross-sectional enlargement on the support part as well as their constructive design are suitable for this.
  • the stress factors of the spring plate during operation of the internal combustion engine in terms of temperature (180 to 200 ° C), engine oil (plus additives), fuel, water, combustion residues and exhaust gases, it is advisable to consider the following plastics when choosing the material: Polyphthalamide, polyiamide 46 (polytetramethylene adipic acid amide), phenol formaldehyde or the like.
  • injection, casting or pressing processes are suitable for the manufacture of the spring plate.
  • a valve train 1 of an internal combustion engine which operates in the four-stroke process, comprises a camshaft 2, a tappet 5 arranged in a bore 3 of a cylinder head 4 and a valve 6.
  • the valve 6 has a valve disk 7 and a valve stem 8, whose valve stem end 9 on a valve lash adjuster 10 des Cup tappet 5 supports.
  • the compression spring 11 is supported on the one hand on the cylinder head 4 (not shown) and on the other hand on a spring plate 12 which is held on the valve stem 8 adjacent to the valve stem end 9 by suitable means.
  • the tappet 5 consist of an aluminum alloy with steel reinforcements, ceramic or the like, the valve made of titanium, ceramic or the like and the spring plate 12 made of glass fiber reinforced plastic, e.g. Polyphthalamaid, polyiamide 46 (polytetramethylene adipamide) or phenol formaldehyde.
  • the compression spring 11 is designed on the basis of this choice of material in such a way that it has a comparatively low weight.
  • a spring part 13 surrounding the valve stem 8 and a support part 14 extending transversely to the valve stem 8 for the compression spring 11, which cooperates with a support surface 15 in a supporting manner.
  • a conical hub bore 16 is machined into the hub part 13 and is designed to receive a corresponding ring-like valve wedge 17.
  • a first radial cross-sectional widening 21 is provided between the support part 14 and the hub part 13.
  • the support part 14 has a second axial cross-sectional widening 22 on the side facing away from the compression spring 11. Both cross-sectional extensions can be arranged all around or only locally.
  • the first cross-sectional widening 21 is designed in the manner of a step 23 which is led away from the supporting part 14 and comprises step regions 24, 25.
  • the transition between the stepped area 24 and 25 is rounded, by means of a radius R1;
  • the transitions between the step area 24 and the bearing surface 15 or step area 25 and outside hub part 13 are rounded, which is due to the radii R2 and R3 is shown.
  • the radii R1 to R3 are designed differently as follows: R1 ⁇ R2 and R2 ⁇ R3.
  • the step area 24 serves as a radial guide for the compression spring 11.
  • the hub part 13 is conical, which is illustrated by construction lines 26, 27.
  • the hub part B tapers in the direction of the valve plate 7.
  • the second cross-sectional extension 22 is an elevation 28 which is delimited by an arcuate line 29.
  • the elevation 28 extends between the outer diameter Da - the spring plate 12 - and an inner diameter Di.
  • the inner diameter Di is larger than the largest diameter DBm of the hub bore 16.
  • the highest point 30 of the elevation 28 intersects a construction line 31 which intersects extends approximately at the same distance between the diameter Da and Di parallel to the valve stem 8 and includes the rectified step region 25.
  • the transition of line 29 into an axial boundary 32 of the spring plate 12, which is set back from the highest point 30 or further away from the valve stem end 9, is rounded off, which is represented by the radius R4.
  • the distance between the point 30 and the boundary 32 is defined by the dimension Z.

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

Description

Die Erfindung betrifft einen Ventiltrieb nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a valve train according to the preamble of patent claim 1.

Die Reibung zwischen einem Tassenstößel und einer Nockenwelle, DE-41 38 985 A1, beeinflußt den mechanischen Wirkungsgrad und damit auch den Kraftstoffverbrauch einer Brennkraftmaschine.The friction between a tappet and a camshaft, DE-41 38 985 A1, affects the mechanical efficiency and thus also the fuel consumption of an internal combustion engine.

Der Einfluß steigt mit zunehmender Zahl der Ventile pro Zylinder, was in der DE-40 39 256 A1 gezeigt wird. In letzterer ist ein Federteller dargestellt, der aus eisenmetallischem Werkstoff besteht und ein konisches den Ventilschaft umgebendes Nabenteil sowie ein quer zum Ventilschaft verlaufendes Abstützteil für die Druckfeder aufweist. Sowohl das Nabenteil wie auch das Abstützteil sind so dimensioniert, daß die auftretenden Kräfte bei Verwendung eines eisenmetallischen Werkstoffes für diesen Federteller aufgenommen werden. Federteller aus Kunststoff sind aus der US-A-4 432 311 bekannt.The influence increases with an increasing number of valves per cylinder, which is shown in DE-40 39 256 A1. In the latter, a spring plate is shown, which is made of ferrous metal material and has a conical hub part surrounding the valve stem and a support part for the compression spring running transversely to the valve stem. Both the hub part and the support part are dimensioned such that the forces that occur are absorbed when using an iron-metallic material for this spring plate. Spring plates made of plastic are known from US-A-4,432,311.

Aufgabe der Erfindung ist es, einen Ventiltrieb einer Brennkraftmaschine in Richtung mechanischer Wirkungsgrad zu optimieren. Dabei soll aber den Bauteilen des Ventiltriebs, die sich für eine Weiterentwicklung aufgrund ihrer konstruktiven Strukturierung besonders eignen, z.B. Federteller, besonderes Augenmerk geschenkt werden.The object of the invention is to optimize a valve train of an internal combustion engine in the direction of mechanical efficiency. However, the components of the valve train that are particularly suitable for further development due to their constructive structure, e.g. Spring plate, special attention should be paid.

Erfindungsgemäß wird diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Weitere, die Erfindung ausgestaltenden Merkmale sind in den Unteransprüchen enthalten.According to the invention, this object is achieved by the characterizing features of patent claim 1. Further features embodying the invention are contained in the subclaims.

Die mit der Erfindung hauptsächlich erzielten Vorteile sind darin zu sehen, daß die bewegten Massen des Ventiltriebs mit dem Ziel gesenkt werden, die Federkräfte der Druckfeder und damit die Reibung zwischen Nockenwelle und Tassenstößel zu reduzieren. Dadurch wird sowohl der mechanische Wirkungsgrad wie auch der Kraftstoffverbrauch verbessert. Ein Bauteil, das sich auf relativ einfache Weise bezüglich bewegte Massen optimieren läßt, ist der Federteller, der benachbart dem freien Ende des Ventilschaftes ruht, und zwar dann, wenn er aus einem Kunststoff, vorzugsweise glasfaserverstärkter Gattung, hergestellt wird. Um bei einer derartigen Werkstoffwahl in etwa gleiche Verhältnisse bezüglich Festigkeit zu erzielen, wie dies bei einem üblichen Stahl-Federteller gegeben ist, sind Spannungen zu reduzieren bzw. Aufbiegungen des Abstützteiles in definierten Grenzen zu halten. Auch gilt es, Materialanhäufungen zu vermeiden, damit das Endprodukt "Federteller aus Kunststoff" lunkerfrei ist. Schließlich ist auch die Zentrierungsfunktion des Federtellers für die Druckfeder zu berücksichtigen.The main advantages achieved with the invention are that the moving masses of the valve train are reduced with the aim of reducing the spring forces of the compression spring and thus the friction between the camshaft and the tappet. This improves both mechanical efficiency and fuel consumption. One component that can be optimized in a relatively simple manner with regard to moving masses is the Spring plate, which rests adjacent to the free end of the valve stem, namely when it is made of a plastic, preferably glass fiber reinforced type. In order to achieve roughly the same strength relationships with such a choice of material as is the case with a conventional steel spring plate, stresses must be reduced or deflections of the support part must be kept within defined limits. It is also important to avoid material accumulation so that the end product "spring plate made of plastic" is free of voids. Finally, the centering function of the spring plate for the compression spring must also be taken into account.

Erfindungsgemäß eignen sich hierfür die erste Querschnittserweiterung am Nabenteil und die zweite Querschnittserweiterung am Abstützteil sowie ihre konstruktive Gestaltung. Um den Beanspruchungsfaktoren des Federtellers während des Betriebs der Brennkraftmaschine bezüglich Temperatur (180 bis 200° C), Motoröl (plus Additive), Kraftstoff, Wasser, Verbrennungsrückständen und Abgasen Rechnung zu tragen, empfiehlt es sich für die Werkstoffauswahl folgende Kunststoffe in Betracht zu ziehen: Polyphthalamid, Polyiamid 46 (Polytetramethylen-Adipinsäureamid), Phenolformaldehyd oder dergleichen. Schließlich eignen sich für die Herstellung des Federtellers Spritz-, Gieß- oder Pressverfahren.According to the invention, the first cross-sectional enlargement on the hub part and the second cross-sectional enlargement on the support part as well as their constructive design are suitable for this. In order to take into account the stress factors of the spring plate during operation of the internal combustion engine in terms of temperature (180 to 200 ° C), engine oil (plus additives), fuel, water, combustion residues and exhaust gases, it is advisable to consider the following plastics when choosing the material: Polyphthalamide, polyiamide 46 (polytetramethylene adipic acid amide), phenol formaldehyde or the like. Finally, injection, casting or pressing processes are suitable for the manufacture of the spring plate.

In der Zeichnung wird ein Ausführungsbeispiel der Erfindung gezeigt, das nachstehend näher beschrieben ist.In the drawing, an embodiment of the invention is shown, which is described in more detail below.

Es zeigt:

Fig.1
einen Teilquerschnitt einer Brennkraftmaschine im Bereich eines Ventiltriebs,
Fig. 2
eine Einzelheit X der Fig. 1 im Schnitt und größerer Maßstab.
It shows:
Fig. 1
a partial cross section of an internal combustion engine in the region of a valve train,
Fig. 2
a detail X of FIG. 1 in section and on a larger scale.

Ein Ventiltrieb 1 einer nicht näher dargestellten Brennkraftmaschine, die im Viertakt-Verfahren arbeitet, umfaßt eine Nockenwelle 2, einen in einer Bohrung 3 eines Zylinderkopfs 4 angeordneten Tassenstößel 5 und ein Ventil 6. Das Ventil 6 weist einen Ventilteller 7 und einen Ventilschaft 8 auf, dessen Ventilschaftende 9 sich an einem Ventilspielausgleichskolben 10 des Tassenstößels 5 abstützt. Eine Druckfeder 11, die den Ventilschaft 8 umgibt, sucht das Ventil 6 in eine geschlossene Endstellung - Konstruktionslage Fig.1 - zu bewegen.A valve train 1 of an internal combustion engine, not shown, which operates in the four-stroke process, comprises a camshaft 2, a tappet 5 arranged in a bore 3 of a cylinder head 4 and a valve 6. The valve 6 has a valve disk 7 and a valve stem 8, whose valve stem end 9 on a valve lash adjuster 10 des Cup tappet 5 supports. A compression spring 11, which surrounds the valve stem 8, tries to move the valve 6 into a closed end position - constructional position Fig.1.

Die Druckfeder 11 stützt sich einerseits am Zylinderkopf 4 - nicht gezeigt - und andererseits an einem Federteller 12 ab, der benachbart dem Ventilschaftende 9 durch geeignete Mittel am Ventilschaft 8 gehalten ist.The compression spring 11 is supported on the one hand on the cylinder head 4 (not shown) and on the other hand on a spring plate 12 which is held on the valve stem 8 adjacent to the valve stem end 9 by suitable means.

Um die Massen des Ventiltriebs 1 zu reduzieren, sind seine Bauteile bezüglich Gewicht optimiert. Dabei bestehen der Tassenstößel 5 aus einer Aluminiumlegierung mit Stahlverstärkungen, Keramik oder dergleichen, das Ventil aus Titan, Keramik oder dergleichen und der Federteller 12 aus glasfaserverstärktem Kunststoff, z.B. Polyphthalamaid, Polyiamid 46 (Polytetramethylen-Adipinsäureamid) oder Phenol formaldehyd. Die Druckfeder 11 ist aufgrund dieser Werkstoffwahl derart gestaltet, daß sie ein vergleichsweise geringes Gewicht hat.In order to reduce the masses of the valve train 1, its components are optimized in terms of weight. The tappet 5 consist of an aluminum alloy with steel reinforcements, ceramic or the like, the valve made of titanium, ceramic or the like and the spring plate 12 made of glass fiber reinforced plastic, e.g. Polyphthalamaid, polyiamide 46 (polytetramethylene adipamide) or phenol formaldehyde. The compression spring 11 is designed on the basis of this choice of material in such a way that it has a comparatively low weight.

Der Federteller 12 weist gemäß Fig. 2 ein den Ventilschaft 8 umgebendes Habenteil 13 und einen quer zum Ventilschaft 8 verlaufendes Abstützteil 14 für die Druckfeder 11 auf, die mit einer Auflagefläche 15 abstützend zusammenwirkt. In das Nabenteil 13 eingearbeitet ist eine konische Nabenbohrung 16, die zur Aufnahme eines korrespondierenden ringartigen Ventilkeils 17 ausgebildet ist. Der in axialer Richtung zweigeteilte Ventilkeil 17 ruht mit einer örtlichen Verdickung 18 in einer Nut 19 des Ventilschafts 8. Auf der der Nabenbohrung 16 abgekehrten Seite 20 ist zwischen Abstützteil 14 und Nabenteil 13 eine erste radiale Querschnittserweiterung 21 vorgesehen. Darüber hinaus weist das Abstützteil 14 auf der der Druckfeder 11 abgekehrten Seite eine zweite axiale Querschnittserweiterung 22 auf. Beide Querschnittserweiterungen können umlaufend oder aber nur örtlich angeordnet sein.2, a spring part 13 surrounding the valve stem 8 and a support part 14 extending transversely to the valve stem 8 for the compression spring 11, which cooperates with a support surface 15 in a supporting manner. A conical hub bore 16 is machined into the hub part 13 and is designed to receive a corresponding ring-like valve wedge 17. The valve wedge 17, which is divided in two in the axial direction, rests with a local thickening 18 in a groove 19 of the valve stem 8. On the side 20 facing away from the hub bore 16, a first radial cross-sectional widening 21 is provided between the support part 14 and the hub part 13. In addition, the support part 14 has a second axial cross-sectional widening 22 on the side facing away from the compression spring 11. Both cross-sectional extensions can be arranged all around or only locally.

Die erste Querschnittserweiterung 21 ist nach Art einer vom Abstützteil 14 weggeführten Stufe 23 ausgebildet, die Stufenbereiche 24, 25 umfaßt. Dabei ist der Übergang zwischen dem Stufenbereich 24 und 25 abgerundet, und zwar mittels einem Radius R1; ebenso sind die Übergänge zwischen dem Stufenbereich 24 und der Auflagefläche 15 bzw. Stufenbereich 25 und Außenseite-Nabenteil 13 gerundet, was durch die Radien R2 bzw. R3 dargestellt ist. Die Radien R1 bis R3 sind wie folgt unterschiedlich ausgeführt: R1<R2 und R2<R3. Die Stufenbereiche 24, 25 weisen etwa gleiche Längen auf: SB1 = SB2, wobei sie ungefähr im rechten Winkel zueinander angeordnet sind. Der Stufenbereich 24 dient als radiale Führung der Druckfeder 11.The first cross-sectional widening 21 is designed in the manner of a step 23 which is led away from the supporting part 14 and comprises step regions 24, 25. The transition between the stepped area 24 and 25 is rounded, by means of a radius R1; Likewise, the transitions between the step area 24 and the bearing surface 15 or step area 25 and outside hub part 13 are rounded, which is due to the radii R2 and R3 is shown. The radii R1 to R3 are designed differently as follows: R1 <R2 and R2 <R3. The step regions 24, 25 have approximately the same lengths: SB1 = SB2, wherein they are arranged approximately at right angles to one another. The step area 24 serves as a radial guide for the compression spring 11.

Im Ausführungsbeispiel ist das Nabenteil 13 konisch ausgeführt, was durch Konstruktionslinien 26, 27 verdeutlicht wird. Dabei verjüngt sich das Nabenteil B in Richtung Ventilteller 7.In the exemplary embodiment, the hub part 13 is conical, which is illustrated by construction lines 26, 27. The hub part B tapers in the direction of the valve plate 7.

Die zweite Querschnittserweiterung 22 ist eine Erhebung 28, die von einer bogenförmigen Linie 29 begrenzt wird. Die Erhebung 28 erstreckt sich zwischen dem Außendurchmesser Da - des Federtellers 12 - und einem inneren Durchmesser Di. Dabei ist der innere Durchmesser Di größer als der größte Durchmesser DBm der Nabenbohrung 16. Die höchste Stelle 30 der Erhebung 28 schneidet eine Konstruktionslinie 31, die sich etwa mit gleichem Abstand zwischen dem Durchmesser Da und Di erstreckend parallel zum Ventilschaft 8 erstreckt und den gleichgerichteten Stufenbereich 25 einschließt. Der Übergang der Linie 29 in eine axiale Begrenzung 32 des Federtellers 12, die gegenüber der höchsten Stelle 30 zurückgesetzt oder weiter entfernt vom Ventilschaftende 9 ist, ist ausgerundet, was durch den Radius R4 dargestellt ist. Schließlich ist der Abstand zwischen der Stelle 30 und der Begrenzung 32 durch das Maß Z definiert.The second cross-sectional extension 22 is an elevation 28 which is delimited by an arcuate line 29. The elevation 28 extends between the outer diameter Da - the spring plate 12 - and an inner diameter Di. The inner diameter Di is larger than the largest diameter DBm of the hub bore 16. The highest point 30 of the elevation 28 intersects a construction line 31 which intersects extends approximately at the same distance between the diameter Da and Di parallel to the valve stem 8 and includes the rectified step region 25. The transition of line 29 into an axial boundary 32 of the spring plate 12, which is set back from the highest point 30 or further away from the valve stem end 9, is rounded off, which is represented by the radius R4. Finally, the distance between the point 30 and the boundary 32 is defined by the dimension Z.

Claims (8)

  1. A valve drive (1) for internal-combustion engines, having a valve (6) and a compression spring (11) urging the said valve (6) into an end position and supported on a spring plate (12) which is mounted [at the] area of the valve adjacent to the end (9) of the valve stem and which consists of plastics material, preferably of a glass-fibre-reinforced type, and comprises an inwardly tapered hub part (13), surrounding the valve stem (8) and provided with a bore (16), and a support part (14) for the compression spring extending transversely to the valve stem, characterized in that the spring plate (12) is provided with a first radial cross-sectional enlargement (21) between the hub part (13) and the support part (14) on the side remote from the hub bore (16) and with a second axial cross-sectional enlargement (22) on the support part (14) on the side remote from the compression spring (11).
  2. A valve drive according to Claim 1, characterized in that the first cross-sectional enlargement (21) is constructed in the manner of a step (23) extending away from the support part (14).
  3. A valve drive according to Claim 2, characterized in that the step (23) comprises step areas (24, 25) extending substantially at right angles to each other and having the same lengths (SB1 = SB2).
  4. A valve drive according to Claim 1, characterized in that the second cross-sectional enlargement (22) is formed by a raised portion (28) extending away from the external diameter (Da) of the spring plate (12).
  5. A valve drive according to Claim 4, characterized in that the raised portion (28) is defined by a curved line (29).
  6. A valve drive according to Claims 4 and 5, characterized in that the raised portion (28) extends between the external diameter (Da) and an internal diameter (Di), the internal diameter (Di) being greater than the diameter (DBm) of the hub bore (16).
  7. A valve drive according to Claims 2 and 3, characterized in that a structural line (31) extending in the direction towards the valve stem and enclosing the step area (24) of the step (23) intersects the highest point (30) of the raised portion (28).
  8. A valve drive according to Claim 1, characterized in that polyphthalamide, polyiamide 46 or polytetramethylene adipic acid amide, phenolformaldehyde or the like is used as the plastics material.
EP93112218A 1992-09-10 1993-07-30 Valve drive for internal combustion engine Expired - Lifetime EP0586871B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4230227A DE4230227A1 (en) 1992-09-10 1992-09-10 Valve train for internal combustion engines
DE4230227 1992-09-10

Publications (2)

Publication Number Publication Date
EP0586871A1 EP0586871A1 (en) 1994-03-16
EP0586871B1 true EP0586871B1 (en) 1996-07-10

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EP93112218A Expired - Lifetime EP0586871B1 (en) 1992-09-10 1993-07-30 Valve drive for internal combustion engine

Country Status (2)

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EP (1) EP0586871B1 (en)
DE (2) DE4230227A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0367552A1 (en) * 1988-10-31 1990-05-09 Isuzu Motors Limited Valve control system for internal combustion engine

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JPS59224410A (en) * 1983-06-03 1984-12-17 Toyota Motor Corp Valve spring retainer of internal-combustion engine
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US4852531A (en) * 1988-03-10 1989-08-01 Dynamet Technology Inc. Titanium poppet valve
DE3809954C1 (en) * 1988-03-24 1989-08-24 Bayerische Motoren Werke Ag, 8000 Muenchen, De Device for the hydraulic opening of a lifting valve
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Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0367552A1 (en) * 1988-10-31 1990-05-09 Isuzu Motors Limited Valve control system for internal combustion engine

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Publication number Publication date
DE4230227A1 (en) 1994-03-17
EP0586871A1 (en) 1994-03-16
DE59303186D1 (en) 1996-08-14

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