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WO2009127348A1 - Soupape d'échappement pour un moteur à piston alternatif - Google Patents

Soupape d'échappement pour un moteur à piston alternatif Download PDF

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Publication number
WO2009127348A1
WO2009127348A1 PCT/EP2009/002580 EP2009002580W WO2009127348A1 WO 2009127348 A1 WO2009127348 A1 WO 2009127348A1 EP 2009002580 W EP2009002580 W EP 2009002580W WO 2009127348 A1 WO2009127348 A1 WO 2009127348A1
Authority
WO
WIPO (PCT)
Prior art keywords
alloy
exhaust valve
forming
valve according
valve
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.)
Ceased
Application number
PCT/EP2009/002580
Other languages
German (de)
English (en)
Inventor
Holger Fellmann
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.)
Maerkisches Werk GmbH
Original Assignee
Maerkisches Werk 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 Maerkisches Werk GmbH filed Critical Maerkisches Werk GmbH
Priority to EP09732571A priority Critical patent/EP2276913B1/fr
Priority to AT09732571T priority patent/ATE532945T1/de
Priority to DK09732571.6T priority patent/DK2276913T3/da
Publication of WO2009127348A1 publication Critical patent/WO2009127348A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • 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
    • F01L3/04—Coated valve members or valve-seats

Definitions

  • the invention relates to an exhaust valve on a reciprocating engine, comprising a valve body and valve head movable valve body having an annular first alloy seat portion which is different from a second nickel base alloy alloy forming at least the main body of the valve disk.
  • the invention further relates to a method for producing a movable valve body for an exhaust valve on a diesel engine.
  • valve body also referred to as valve stem or valve cone
  • valve stem or valve cone are highly stressed components in diesel engines, especially large diesel engines in marine propulsion, power plants, emergency generators or the like. Due to the high mechanical and thermal stresses, the seat and guide surfaces of such valve cone are exposed to high wear stresses. Exhaust valves in the area of the valve disk are subject to particularly high corrosion stresses by the combustion gases. Therefore, special valve steels have been developed in the present field of application. In the area of highly stressed surfaces of the valve disk, special alloys, preferably nickel-based, are increasingly being used.
  • a known outlet valve of the type mentioned (EP 0 521 821 Bl) is provided to form the valve body of a heat-resistant nickel-based alloy such as NIM80A or NIM81 and use in the seat to increase the wear resistance and corrosion resistance under IN625 or IN671 known nickel-based alloy (Bei the known alloys are the brands Nimonic and Inconel of the manufacturer Inco Alloys International, Inc.) -
  • the seat area is produced by plasma spraying, build-up welding or powder metallurgical processes with subsequent hot deformation in a rolling process or by cold forming.
  • valve stem it may be expedient to harden the surface of the valve stem by plasma nitriding or plasma nitrocarburizing and to improve its lubricity.
  • the main valve body in the region of the valve disk which consists of austenitic valve steel, for example AISI316, is provided with a valve
  • a valve To provide armor made of a nickel-based alloy high resistance to hot gas corrosion in the area of the valve bottom.
  • Various nickel-based alloys are proposed for the seating area of the valve, such as IN625, IN671, IN690, IN718 and the like. After welding the seat alloy, an increase in its hardness or yield strength is proposed by means of a thermomechanical forming process.
  • the present invention seeks to avoid such cracking as a result of high temperature changes in the valve seat or the rounding of the valve disc as possible, but at least to limit their negative impact, to keep the seating area on sides of the valve body as possible without cracking the use of high quality hot gas corrosion and refrain from attacking resistant alloys or their use must be restricted.
  • the plate bottom, peripheral region and edge region of the valve disk are formed from the same alloy by welding on the base body and further characterized in that the hardness of the alloy forming the enveloping body is lower than that of the first or the second alloy.
  • a predetermined breaking point for the initiation of crack formation can be produced according to the invention in that the thickness of the peripheral region measured in the radial direction is increased within a limited peripheral section whose arc length is expediently between 20 and 40 angular degrees. In this way, it is possible to largely free the remaining circumference of the valve disk from cracking. Cracks within the reinforced perimeter area can be used to control their propagation so that their early proof of avoidance of major damage is possible.
  • a hardness value of 200 to 350 HV is sufficient if the base body is forged from NIM80A, which has a hardness of over 400 HV, and where Stellite 6 with a hardness is used as seating area alloy from 400 to 500 HV is used.
  • a coherent enveloping body is produced by build-up welding on the base body of the valve disk in the region of the disk base and in its peripheral region and an adjoining edge region.
  • Such a self-compression stress is particularly advantageous because it forms a kind of reserve in case of overheating of the engine with subsequent cooling.
  • the associated tensile stresses cause namely first a reduction of the existing compressive stress before it comes to the dreaded cracking.
  • the yield strength in the region of the plate bottom is reached correspondingly later at such tensile stresses.
  • FIG. 1 a view of the valve disk
  • FIG. 2 a cross section through the valve bottom according to II-II of FIG. 1
  • FIG. 3 shows a longitudinal section in the peripheral region of the valve disk according to III-III of Figure 2
  • FIG. 4 shows a longitudinal section in the peripheral region of the valve disk according to IV-IV of Figure 2.
  • FIG. 1 shows a movable valve body 1 with a shortened valve stem 2 and a valve disk 3, which has an annular seating area 4, for example of the cobalt-based alloy Stellite 6.
  • the valve disk On its underside, the valve disk has a telescopic Example 5, which consists for example of the nickel-based alloy IN625.
  • the plate base 5 is adjoined by a peripheral region 6, likewise made of IN625 and adjoining an edge region 7, likewise of IN625.
  • a body 8 forming the interior of the outlet valve extends from the valve disk 3 towards the shaft 2 and forms at least its lower part, depending on whether it is a full-body valve or a bimetallic valve in which an upper shaft part usually consists of a valve steel is connected to the lower shaft part by friction welding.
  • the main body 8 according to the present example is made of Nimonic 8OA and is made by forging. On the main body 8, an enveloping body consisting of plate base 5, peripheral region 6 and edge region 7 is generated by welding. After welding on the enveloping body, the seating alloy made of stellite 6, which forms the seating area 4, is likewise formed by welding in a circumferential groove 9 thereof.
  • the representation according to FIG. 4 differs from that according to FIG. 3 in that in FIG. 4 the peripheral region 6 is thickened, as can be seen in the sectional illustration according to FIG. In the area of the thickening, its inside 10 in the sectional view according to FIG. 2 is like a chord, which extends within a circular arc b of about 30 degrees.
  • the outer surface of the valve disk is deformed by cold forming, for example by rolling or cold pressing.
  • the enveloping body is deformed in such a way, in particular in the circumferential region 6, that a compressive residual stress is created in the region of the plate base 5 from the residual tensile stress existing after welding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lift Valve (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Une soupape d'échappement sur un moteur à piston alternatif comprend un corps de soupape mobile, composé d'une tige de soupape et d'une tête de soupape qui possède une zone d'appui annulaire dans un premier alliage qui diffère d'un deuxième alliage formant au moins le corps de base de la tête de soupape, de type alliage à base de nickel. Pour ce faire, le premier alliage est constitué d'un alliage à base de nickel ou de cobalt avec une plus grande résistance à l'usure que le deuxième alliage. Une zone de l'assiette (5) de soupape (3) formant le fond de l'assiette est formée d'un troisième alliage et une zone périphérique qui la prolonge d'un quatrième alliage qui sont faits chacun d'un alliage à base de nickel avec une résistance élevée à la corrosion par les gaz chauds. Une zone marginale de l'assiette de soupape (3) prolongeant la zone périphérique, faite d'un cinquième alliage, également un alliage à base de nickel à haute résistance à la corrosion, s'étend jusqu'au-dessous de la zone de siège (4) et la double intégralement.
PCT/EP2009/002580 2008-04-14 2009-04-08 Soupape d'échappement pour un moteur à piston alternatif Ceased WO2009127348A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09732571A EP2276913B1 (fr) 2008-04-14 2009-04-08 Soupape d'échappement pour un moteur à piston alternatif
AT09732571T ATE532945T1 (de) 2008-04-14 2009-04-08 Auslassventil an einem hubkolbenmotor
DK09732571.6T DK2276913T3 (da) 2008-04-14 2009-04-08 Udløbsventil på en stempelmotor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008018875.1 2008-04-14
DE102008018875A DE102008018875A1 (de) 2008-04-14 2008-04-14 Auslassventil an einem Hubkolbenmotor

Publications (1)

Publication Number Publication Date
WO2009127348A1 true WO2009127348A1 (fr) 2009-10-22

Family

ID=40886618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/002580 Ceased WO2009127348A1 (fr) 2008-04-14 2009-04-08 Soupape d'échappement pour un moteur à piston alternatif

Country Status (5)

Country Link
EP (1) EP2276913B1 (fr)
AT (1) ATE532945T1 (fr)
DE (1) DE102008018875A1 (fr)
DK (1) DK2276913T3 (fr)
WO (1) WO2009127348A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9644504B2 (en) 2015-03-17 2017-05-09 Caterpillar Inc. Single crystal engine valve

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061237A1 (de) * 2008-12-09 2010-06-10 Man Diesel Se Gaswechselventil und Verfahren zu seiner Herstellung
DE102009016833B3 (de) * 2009-04-09 2011-01-13 Märkisches Werk GmbH Bimetallventil
DE102011056480A1 (de) * 2011-12-15 2013-06-20 Gesenkschmiede Schneider Gmbh Verfahren zur Herstellung eines umgeformten metallischen Werkstücks mit Panzerung
DK177960B1 (en) * 2014-04-08 2015-02-02 Man Diesel & Turbo Deutschland An exhaust valve for an internal combustion engine
DE102021106647A1 (de) 2021-03-18 2022-09-22 Federal-Mogul Valvetrain Gmbh Gepanzertes Tellerventil und Verfahren zu seiner Herstellung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60122206A (ja) * 1983-12-06 1985-06-29 Mitsui Eng & Shipbuild Co Ltd 内燃機関の弁
EP0204121A1 (fr) * 1985-05-11 1986-12-10 M.A.N. - B&W Diesel GmbH Procédé de fabrication d'une soupape susceptible d'absorber les chocs thermiques et mécaniques et qui résiste à la corrosion à chaud, la soupape étant destinée aux moteurs à combustion interne fonctionnant à l'huile lourde
US5084113A (en) * 1985-05-24 1992-01-28 Toyota Jidosha Kabushiki Kaisha Method of producing a buildup valve for use in internal combustion engines
DE19911618A1 (de) * 1998-03-16 1999-09-23 Maerkisches Werk Gmbh Verfahren zur Erhöhung der Verschleißfestigkeit von Gaswechselventilen von Verbrennungsmotoren und Gaswechselventilen
EP1193316A1 (fr) * 2000-08-28 2002-04-03 Hitachi, Ltd. Alliage résistant à l'usure et à la corrosion et dispositif utilisant cet alliage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2856232A1 (de) * 1978-12-27 1980-07-17 Teves Thompson Gmbh Thermisch und korrosiv hoch beanspruchtes tellerventil
JPS59192811A (ja) * 1983-04-14 1984-11-01 Mitsubishi Heavy Ind Ltd きのこ状弁
JPS63309705A (ja) * 1986-12-30 1988-12-16 Aichi Steel Works Ltd 自動車用エンジンバルブおよびその製造方法
EP0521821B1 (fr) 1991-07-04 1996-07-31 New Sulzer Diesel Ag Soupape d'échappement d'un moteur à combustion interne du type Diesel et son procédé de fabrication
DK173136B1 (da) * 1996-05-15 2000-02-07 Man B & W Diesel As Bevægeligt vægelement i form af en udstødsventilspindel eller et stempel i en forbrændingsmotor.
DK173348B1 (da) 1996-06-07 2000-08-07 Man B & W Diesel As Udstødsventil til en forbrændingsmotor
DE102005013088B4 (de) 2005-03-18 2006-12-28 Man B & W Diesel Ag Gaswechselventil mit Korrosionsschutzschicht

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60122206A (ja) * 1983-12-06 1985-06-29 Mitsui Eng & Shipbuild Co Ltd 内燃機関の弁
EP0204121A1 (fr) * 1985-05-11 1986-12-10 M.A.N. - B&W Diesel GmbH Procédé de fabrication d'une soupape susceptible d'absorber les chocs thermiques et mécaniques et qui résiste à la corrosion à chaud, la soupape étant destinée aux moteurs à combustion interne fonctionnant à l'huile lourde
US5084113A (en) * 1985-05-24 1992-01-28 Toyota Jidosha Kabushiki Kaisha Method of producing a buildup valve for use in internal combustion engines
DE19911618A1 (de) * 1998-03-16 1999-09-23 Maerkisches Werk Gmbh Verfahren zur Erhöhung der Verschleißfestigkeit von Gaswechselventilen von Verbrennungsmotoren und Gaswechselventilen
EP1193316A1 (fr) * 2000-08-28 2002-04-03 Hitachi, Ltd. Alliage résistant à l'usure et à la corrosion et dispositif utilisant cet alliage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9644504B2 (en) 2015-03-17 2017-05-09 Caterpillar Inc. Single crystal engine valve

Also Published As

Publication number Publication date
ATE532945T1 (de) 2011-11-15
EP2276913B1 (fr) 2011-11-09
DE102008018875A1 (de) 2009-10-15
DK2276913T3 (da) 2011-12-19
EP2276913A1 (fr) 2011-01-26

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