EP0898055A1 - Hollow valve for internal combustion engine - Google Patents

Hollow valve for internal combustion engine Download PDF

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Publication number
EP0898055A1
EP0898055A1 EP97114254A EP97114254A EP0898055A1 EP 0898055 A1 EP0898055 A1 EP 0898055A1 EP 97114254 A EP97114254 A EP 97114254A EP 97114254 A EP97114254 A EP 97114254A EP 0898055 A1 EP0898055 A1 EP 0898055A1
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EP
European Patent Office
Prior art keywords
valve
hollow
valve body
cavity
shaft end
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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.)
Granted
Application number
EP97114254A
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German (de)
French (fr)
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EP0898055B1 (en
Inventor
Klaus Dipl.-Ing. Gebauer
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TRW Deutschland GmbH
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TRW Deutschland GmbH
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Priority to EP97114254A priority Critical patent/EP0898055B1/en
Priority to DE59707222T priority patent/DE59707222D1/en
Priority to US09/136,356 priority patent/US6006713A/en
Publication of EP0898055A1 publication Critical patent/EP0898055A1/en
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Publication of EP0898055B1 publication Critical patent/EP0898055B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • 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
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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
    • F01L3/12—Cooling of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • 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
    • F01L3/12—Cooling of valves
    • F01L3/14—Cooling of valves by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve

Definitions

  • the invention relates to a hollow valve for internal combustion engines for lowering the temperature and Weight reduction.
  • Hollow valves are a special type, especially those with higher loads Exhaust valves, represent. On the one hand, they are mainly used to lower the temperatures in the fillet and plate area also serves to reduce weight. You sit down Hollow valves to lower the temperature, the cavity becomes about 60% of the volume filled with metallic sodium, which is used to transport heat from the valve head into the Valve stem provides. From there, the heat is dissipated via the valve guide.
  • the base body is also drilled from the shaft end. However, the bore is closed by induction heating of the shaft end with subsequent forging, the full shaft end piece being attached by friction welding. A friction weld of the full shaft end piece with the drawn "end of the base body offers greater security. This embodiment is used predominantly in high-performance engines.
  • valve stem seals to high temperatures Valve, however, only up to the vicinity of the sealing lip of the outer diameter predominantly elastomeric valve stem seals. A longer hole can only if no valve stem seal is used.
  • Hollow valves can be designed as monometal valves, but they are more common Bimetallic valves, in which the stem piece made of a ferritic-martensitic steel and the Headpiece made of austenitic material or a nickel-based material. This Material is thermoformed during the manufacture of the head piece before it is drilled hollow.
  • the production of very light valves is already known, for which stem and Headboard as a one-piece, hollow, cylindrical component made of a ductile sheet metal is, as EP 0 619 419 B1 shows, but it is a monometal valve for lower loads, because the use of austenitic material closed previously cold forming processes.
  • the cavity is sufficient in the known valve deep-drawn valve body to the extreme end of the stem. A dissipation of heat through a possibly used valve filling in the shaft end piece would be under certain circumstances harmful.
  • the use of such valves for temperature reduction is at least Valve guides with final valve stem seals are very questionable.
  • the invention has for its object to a hollow bimetal valve of very low mass create, which at the same time the demands for great mechanical wear resistance and resistance to high temperature corrosion met and compared to the previously known manufacturing process is particularly economical to manufacture.
  • the invention solves this problem with the features of the characterizing part of claim 1.
  • a valve designed according to the invention permits the use of the deep-drawing process for the part of the valve body which extends from the stem end part into the plate area and consists of an austenitic material.
  • the largest possible internal bead on the weld seam is created by the welding process (Welding expulsion), which creates the connection between the drilled cavity in the Shaft end part and the cavity in the valve body either completely or partially closes.
  • the coolant present in the valve body is thus penetrated into the Cavity of the stem end part prevented and the valve stem seal at the end of the Valve guide protected against damage due to excessive temperature.
  • the cavity in the Shaft end piece therefore only serves the desired weight reduction.
  • the cover that closes off the plate area is preferably covered with the seat armor Valve body connected. This simplifies the manufacturing process and a economical production ensured, although the valve consists of three parts. Training of the valve body as a deep-drawn component enables the economically Vary wall thickness and thus adapt to the load requirements.
  • the valve consists essentially of the three parts shaft end part 1, valve body 2 and Cover 3.
  • the shaft end part 1 is provided with a bore 4 in order to close the cavity 5 create.
  • the valve body 2 with the plate, the fillet area 7 and in the Valve guide-reaching stem part 9 is a deep-drawn component.
  • the shaft end part is 1 in contrast, made in the usual way from a ferritic-martensitic material.
  • the both parts 1 and 2 are preferably connected to one another by friction welding, the inner bead (welding expulsion) 10 extending far inward forms.
  • the Cavity divided into sections 5 and 11, with a small passage cross section 12th can be preserved.
  • the valve head In the plate area, the valve head is closed by a cover 3, the Seat armor 15 also serves as a welded joint.
  • Figures 2 to 5 are different designs of the contact surfaces between the Valve head shown in the plate area and the cover 3.
  • the armor 15 serves as a connecting element between the cover 3 and the valve body.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Lift Valve (AREA)

Abstract

The hollow valve includes a hollow cavity to reduce the temperature and weight of the valve. The valve consists of three parts (1,2,3) welded to each other and enclosing the hollow cavity (5). The cavity extends from the plate region (13) of the valve body into the valve stem. The valve body from the stem end part to the plate region is in the form of a deep-drawn sheet part of austenite material. It is connected to the shaft end part by welding.

Description

Die Erfindung betrifft ein Hohlventil für Verbrennungsmotoren zur Temperaturabsenkung und Gewichtsreduzierung.The invention relates to a hollow valve for internal combustion engines for lowering the temperature and Weight reduction.

Hohlventile stellen eine besondere Ausführungsart, insbesondere der höher belasteten Auslaßventile, dar. Ihr Einsatz erfolgt einerseits zur Absenkung der Temperaturen vorwiegend im Hohlkehlen- und Tellerbereich dient aber auch der Gewichtsreduzierung. Setzt man Hohlventile zur Temperaturabsenkung ein, wird der Hohlraum zu etwa 60 % des Volumens mit metallischem Natrium gefüllt, das für den Transport von Wärme vom Ventilkopf in den Ventilschaft sorgt. Von dort wird die Wärme über die Ventilführung abgeleitet.Hollow valves are a special type, especially those with higher loads Exhaust valves, represent. On the one hand, they are mainly used to lower the temperatures in the fillet and plate area also serves to reduce weight. You sit down Hollow valves to lower the temperature, the cavity becomes about 60% of the volume filled with metallic sodium, which is used to transport heat from the valve head into the Valve stem provides. From there, the heat is dissipated via the valve guide.

Es sind mehrere Hohlventilvarianten bekannt. Bei einer dieser Varianten wird ein Grundkörper hohl gebohrt und mittels Reibschweißen mit einem vollen Schaftendenstück verbunden. Das Schaftendenstück ist härtbar und läßt daher eine auf den besonderen Belastungsfall abgestimmte Stabilisierung zu.Several variants of hollow valves are known. In one of these variants, it becomes a basic body hollow drilled and connected to a full shaft end piece by means of friction welding. The The end piece of the shaft is hardenable and therefore leaves a special load coordinated stabilization.

Eine weitere Variante ist in der Herstellung wesentlich aufwendiger. Der Grundkörper wird ebenfalls vom Schaftende her gebohrt. Das Verschließen der Bohrung erfolgt jedoch durch induktives Erwärmen des Schaftendes mit anschließendem Zuschmieden, wobei das volle Schaftendenstück durch Reibschweißen angesetzt wird. Eine Reibschweißung des vollen Schaftendenstuckes mit dem

Figure 00020001
zugezogenen" Ende des Grundkörpers bietet eine höhere Sicherheit. Diese Ausführungsform findet überwiegend in Hochleistungsmotoren Anwendung.Another variant is much more complex to manufacture. The base body is also drilled from the shaft end. However, the bore is closed by induction heating of the shaft end with subsequent forging, the full shaft end piece being attached by friction welding. A friction weld of the full shaft end piece with the
Figure 00020001
drawn "end of the base body offers greater security. This embodiment is used predominantly in high-performance engines.

Das bisherige Optimum an Gewichtsreduzierung und an Wärmeableitung von der Ventiltellerfläche wird durch ein Hohlkopfventil erreicht. Es wird im Gegensatz zu den vorgenannten Ausführungen von der Tellerseite her gebohrt und bearbeitet. Die Öffnung wird durch Einsetzen eines Deckels verschlossen. Der Einsatz solcher Ventile ist überwiegend auf den Motorsport beschränkt, da die aufwendige Herstellung zu hohen Kosten führt. Um die Ventilschaftabdichtungen nicht zu hohen Temperaturen auszusetzen, darf die Bohrung des Ventils jedoch nur bis in die Nähe der Dichtlippe der am Außendurchmesser laufenden, überwiegend elastomeren Ventilschaftabdichtung geführt sein. Eine längere Bohrung kann lediglich ausgeführt werden, wenn keine Ventilschaftabdichtung verwendet wird.The previous optimum in weight reduction and heat dissipation from the Valve disc area is achieved by a hollow head valve. It is contrary to the Drilled and machined the aforementioned designs from the plate side. The opening will closed by inserting a lid. The use of such valves is predominantly based on limited the motor sport, because the complex production leads to high costs. To the Do not expose valve stem seals to high temperatures Valve, however, only up to the vicinity of the sealing lip of the outer diameter predominantly elastomeric valve stem seals. A longer hole can only if no valve stem seal is used.

Hohle Ventile können zwar als Monometallventile ausgeführt sein, üblicher sind aber Bimetallventile, bei welchen das Schaftstück aus einem ferritisch-martensitischen Stahl und das Kopfstück aus austenitischem Material oder einem nickelbasischen Werkstoff besteht. Dieses Material wird bei der Herstellung des Kopfstückes warm verformt, bevor es hohlgebohrt wird. Zwar ist bereits die Herstellung von sehr leichten Ventilen bekannt, bei welchen Schaft- und Kopfteil als einstückiges, hohles, zylindrisches Bauteil aus einem duktilen Metallblech gefertigt wird, wie die EP 0 619 419 B1 zeigt, jedoch handelt es sich hierbei um ein Monometallventil für geringere Beanspruchungen, denn die Verwendung von austenitischem Werkstoff schloß bisher Kaltumformvorgänge aus. Außerdem reicht der Hohlraum bei dem bekannten Ventil mit tiefgezogenem Ventilkörper bis zum äußersten Schaftende. Eine Ableitung von Wärme durch eine eventuell verwendete Ventilfüllung in das Schaftendstück wäre jedoch unter Umständen schädlich. Der Einsatz solcher Ventile zur Temperaturabsenkung ist zumindest bei Ventilführungen mit abschließender Ventilschaftabdichtung sehr bedenklich.Hollow valves can be designed as monometal valves, but they are more common Bimetallic valves, in which the stem piece made of a ferritic-martensitic steel and the Headpiece made of austenitic material or a nickel-based material. This Material is thermoformed during the manufacture of the head piece before it is drilled hollow. The production of very light valves is already known, for which stem and Headboard as a one-piece, hollow, cylindrical component made of a ductile sheet metal is, as EP 0 619 419 B1 shows, but it is a monometal valve for lower loads, because the use of austenitic material closed previously cold forming processes. In addition, the cavity is sufficient in the known valve deep-drawn valve body to the extreme end of the stem. A dissipation of heat through a possibly used valve filling in the shaft end piece would be under certain circumstances harmful. The use of such valves for temperature reduction is at least Valve guides with final valve stem seals are very questionable.

Der Erfindung liegt die Aufgabe zugrunde, ein hohles Bimetallventil sehr geringer Masse zu schaffen, welches gleichzeitig die Forderungen nach großer mechanischer Verschleißfestigkeit und Widerstandsfähigkeit gegen Hochtemperaturkorrosion erfüllt und im Vergleich zu den bisher bekannten Herstellungsverfahren besonders wirtschaftlich herstellbar ist. Die Erfindung löst diese Aufgabe mit den Merkmalen des Kennzeichenteils des Patentanspruchs 1.The invention has for its object to a hollow bimetal valve of very low mass create, which at the same time the demands for great mechanical wear resistance and resistance to high temperature corrosion met and compared to the previously known manufacturing process is particularly economical to manufacture. The invention solves this problem with the features of the characterizing part of claim 1.

Ein erfindungsgemäß gestaltetes Ventil gestattet die Verwendung des Tiefziehverfahrens für den Teil des Ventilkörpers, der sich vom Schaftendenteil bis in den Tellerbereich erstreckt und aus einem austenitischen Werkstoff besteht.A valve designed according to the invention permits the use of the deep-drawing process for the part of the valve body which extends from the stem end part into the plate area and consists of an austenitic material.

Für Fachleute als sehr überraschend hat sich die erfolgreiche Verwendung eines nicht als tiefziehfähig geltenden austenitischen Werkstoffs für die Ausbildung des Ventilkörpers als tiefgezogenes Blechteil erwiesen.For professionals, it was very surprising that the successful use of one did not turn out to be Austenitic material that can be deep-drawn for the formation of the valve body as deep-drawn sheet metal part proven.

An der Schweißnaht wird durch den Schweißvorgang eine möglichst große Innenwulst (Schweißaustrieb) erzeugt, welche die Verbindung zwischen dem gebohrten Hohlraum im Schaftendenteil und dem Hohlraum im Ventilkörper entweder vollständig oder teilweise verschließt. Das im Ventilkörper vorhandene Kühlmittel wird somit am Eindringen in den Hohlraum des Schaftendenteils gehindert und die Ventilschaftdichtung am Ende der Ventilführung vor einer Beschädigung durch zu hohe Temperatur geschützt. Der Hohlraum im Schaftendenstuck dient damit lediglich der gewünschten Gewichtsreduzierung.The largest possible internal bead on the weld seam is created by the welding process (Welding expulsion), which creates the connection between the drilled cavity in the Shaft end part and the cavity in the valve body either completely or partially closes. The coolant present in the valve body is thus penetrated into the Cavity of the stem end part prevented and the valve stem seal at the end of the Valve guide protected against damage due to excessive temperature. The cavity in the Shaft end piece therefore only serves the desired weight reduction.

Vorzugsweise ist der den Tellerbereich abschließende Deckel durch die Sitzpanzerung mit dem Ventilkörper verbunden. Dadurch wird das Herstellungsverfahren vereinfacht und eine wirtschaftliche Fertigung gesichert, obwohl das Ventil aus drei Teilen besteht. Die Ausbildung des Ventilkörpers als tiefgezogenes Bauteil ermöglicht in wirtschaftlich günstiger Weise, die Wandstärke zu variieren und damit den Belastungsanforderungen anzupassen.The cover that closes off the plate area is preferably covered with the seat armor Valve body connected. This simplifies the manufacturing process and a economical production ensured, although the valve consists of three parts. Training of the valve body as a deep-drawn component enables the economically Vary wall thickness and thus adapt to the load requirements.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung rein schematisch dargestellt und nachstehend erläutert. Es zeigen:

Figur 1
den Längsschnitt durch ein Ventil und die
Figuren 2 bis 5
mehrere Ausbildungsvarianten an den Verbindungsstellen zwischen dem Deckel und dem Ventilkörper.
In the drawing, an embodiment of the invention is shown purely schematically and explained below. Show it:
Figure 1
the longitudinal section through a valve and the
Figures 2 to 5
several training variants at the connection points between the cover and the valve body.

Das Ventil besteht im wesentlichen aus den drei Teilen Schaftendenteil 1, Ventilkörper 2 und Deckel 3. Das Schaftendenteil 1 ist mit einer Bohrung 4 versehen, um den Hohlraum 5 zu schaffen. Der Ventilkörper 2 mit dem Teller, dem Hohlkehlenbereich 7 und dem in die Ventilführung reichenden Schaftteil 9 ist ein tiefgezogenes Bauteil. Das Schaftendenteil 1 ist demgegenüber in üblicher Weise aus einem ferritisch-martensitischen Werkstoff gefertigt. Die beiden Teile 1 und 2 werden vorzugsweise durch Reibschweißen miteinander verbunden, wobei sich die weit einwärts reichende Innenwulst (Schweißaustrieb) 10 bildet. Dabei wird der Hohlraum in die Abschnitte 5 und 11 unterteilt, wobei ein kleiner Durchtrittsquerschnitt 12 erhalten bleiben kann. Dadurch ist es dem im Hohlraum 11 des Ventilkörpers 2 vorhandenen Kühlmittel nicht oder nur in einem sehr geringen Maße möglich, in den Hohlraum 5 des Schaftendenteils 1 zu gelangen. Der schaftendenseitige Hohlraum dient daher lediglich der Gewichtsreduzierung. Die vom Ventilteller 13 über das Kühlmittel in den Schaft des Ventilkörpers geleitete Wärme wird in ausreichendem Maße auf die Führung 8 übertragen und von dort weiter über den Wasserkreislauf im Zylinderkopf abgeleitet. Die am Ende der Ventilführung ansetzende Schaftdichtung 14 wird somit vor Zerstörung durch zu hohe Wärme geschützt.The valve consists essentially of the three parts shaft end part 1, valve body 2 and Cover 3. The shaft end part 1 is provided with a bore 4 in order to close the cavity 5 create. The valve body 2 with the plate, the fillet area 7 and in the Valve guide-reaching stem part 9 is a deep-drawn component. The shaft end part is 1 in contrast, made in the usual way from a ferritic-martensitic material. The both parts 1 and 2 are preferably connected to one another by friction welding, the inner bead (welding expulsion) 10 extending far inward forms. The Cavity divided into sections 5 and 11, with a small passage cross section 12th can be preserved. As a result, it is the one present in the cavity 11 of the valve body 2 Coolant not or only to a very small extent possible in the cavity 5 of the To arrive shaft end part 1. The cavity at the shaft end therefore only serves the purpose of Weight reduction. The from the valve plate 13 via the coolant in the shaft of the Valve body conducted heat is sufficiently transferred to the guide 8 and from there it is diverted via the water circuit in the cylinder head. The end of the Valve guide attaching shaft seal 14 is thus prevented from being destroyed by excessive heat protected.

Im Tellerbereich wird der Ventilkopf durch einen Deckel 3 verschlossen, wobei die Sitzpanzerung 15 gleichzeitig als Schweißverbindung dient.In the plate area, the valve head is closed by a cover 3, the Seat armor 15 also serves as a welded joint.

In den Figuren 2 bis 5 sind verschiedene Gestaltungen der Berührungsflächen zwischen dem Ventilkopf im Tellerbereich und dem Deckel 3 dargestellt. Bei allen Ausführungsbeispielen dient die Sitzpanzerung 15 gleichzeitig als Verbindungselement zwischen dem Deckel 3 und dem Ventilkörper.In Figures 2 to 5 are different designs of the contact surfaces between the Valve head shown in the plate area and the cover 3. In all embodiments the armor 15 serves as a connecting element between the cover 3 and the valve body.

Claims (6)

Hohlventil für Verbrennungsmotoren mit einem Hohlraum zur Temperaturabsenkung und Gewichtsreduzierung, dadurch gekennzeichnet, daß das Ventil aus drei miteinander verschweißten Teilen (1, 2, 3) besteht, welche einen Hohlraum einschließen, der sich vom Tellerbereich des Ventilkörpers bis in den Ventilschaft hinein erstreckt, wobei der sich vom Schaftendenteil (1) bis zum Tellerbereich (13) erstreckende Ventilkörper (2) als tiefgezogenes Blechteil aus austenitischem Werkstoff ausgebildet und mit dem Schaftendenteil durch Schweißen verbunden ist.Hollow valve for internal combustion engines with a cavity for lowering the temperature and weight reduction, characterized in that the valve consists of three together welded parts (1, 2, 3) which enclose a cavity which extends from the Plate area of the valve body extends into the valve stem, which extends from Valve body (2) as a deep-drawn valve body part (1) extending to the plate area (13) Sheet metal part made of austenitic material and through with the shaft end part Welding is connected. Hohlventil nach Anspruch 1, dadurch gekennzeichnet, daß an der Schweißnaht eine den Hohlraumquerschnitt teilweise oder vollständig verschließende Innenwulst (10) ausgebildet ist.Hollow valve according to claim 1, characterized in that at the weld a Cavity cross section partially or completely closing inner bead (10) is formed. Hohlventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Schaftendenteil (1) hohlgebohrt ist.Hollow valve according to claim 1 or 2, characterized in that the shaft end part (1) is drilled hollow. Hohlventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Schaftendenteil aus einem ferritisch-martensitischen Stahl besteht. Hollow valve according to one of claims 1 to 3, characterized in that the Shaft end part consists of a ferritic-martensitic steel. Hohlventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der tiefgezogene Blechteil des Ventilkörpers (2) im Bereich besonders hoher Belastung mit einer größeren Wandstärke versehen ist.Hollow valve according to one of claims 1 to 4, characterized in that the deep-drawn sheet metal part of the valve body (2) in the area of particularly high loads with a larger wall thickness is provided. Hohlventil nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Ventilteller (13) mit einem Deckel (3) verschlossen ist, und beide Teile durch die Sitzpanzerung (15) miteinander verschweißt sind.Hollow valve according to one of claims 1 to 5, characterized in that the Valve plate (13) with a cover (3) is closed, and both parts through Seat armor (15) are welded together.
EP97114254A 1997-08-19 1997-08-19 Hollow valve for internal combustion engine Expired - Lifetime EP0898055B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97114254A EP0898055B1 (en) 1997-08-19 1997-08-19 Hollow valve for internal combustion engine
DE59707222T DE59707222D1 (en) 1997-08-19 1997-08-19 Hollow valve for internal combustion engines
US09/136,356 US6006713A (en) 1997-08-19 1998-08-19 Hollow valve for internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97114254A EP0898055B1 (en) 1997-08-19 1997-08-19 Hollow valve for internal combustion engine

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EP0898055A1 true EP0898055A1 (en) 1999-02-24
EP0898055B1 EP0898055B1 (en) 2002-05-08

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JP4390291B1 (en) 2008-09-18 2009-12-24 株式会社 吉村カンパニー Method for manufacturing valve head part of hollow engine valve and hollow engine valve
KR101123658B1 (en) 2008-10-10 2012-03-22 니탄 밸브 가부시키가이샤 Hollow poppet valve and method of manufacturing the same
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DE102018112295A1 (en) * 2018-05-23 2019-11-28 Federal-Mogul Valvetrain Gmbh METHOD FOR PRODUCING A HOLLOW VALVE WITH OPTIMIZED SHAFT INNER GEOMETRY FOR COMBUSTION ENGINES
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US11732622B2 (en) 2018-05-23 2023-08-22 Federal-Mogul Valvetrain Gmbh Method for producing a hollow valve with an optimised interior stem geometry for internal combustion engines
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DE102019106222A1 (en) * 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Process for the production of a hollow valve for internal combustion engines
DE102019106209A1 (en) * 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Process for the production of a hollow valve for internal combustion engines
DE102019106214A1 (en) * 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Process for the production of a hollow valve for internal combustion engines
US11524330B2 (en) 2019-03-12 2022-12-13 Federal-Mogul Valvetrain Gmbh Method for producing a hollow valve for internal combustion engines
WO2020182370A1 (en) 2019-03-12 2020-09-17 Federal-Mogul Valvetrain Gmbh Method for producing a hollow valve for internal combustion engines
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EP0898055B1 (en) 2002-05-08
US6006713A (en) 1999-12-28

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