CA2601053A1 - Gas exchange valve having corrosion protection layer - Google Patents
Gas exchange valve having corrosion protection layer Download PDFInfo
- Publication number
- CA2601053A1 CA2601053A1 CA002601053A CA2601053A CA2601053A1 CA 2601053 A1 CA2601053 A1 CA 2601053A1 CA 002601053 A CA002601053 A CA 002601053A CA 2601053 A CA2601053 A CA 2601053A CA 2601053 A1 CA2601053 A1 CA 2601053A1
- Authority
- CA
- Canada
- Prior art keywords
- valve
- layer
- cone
- nitration
- gas exchange
- 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.)
- Abandoned
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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/32—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for rotating lift valves, e.g. to diminish wear
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- 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
-
- 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
- F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to a gas shuttle valve for an internal combustion engine comprising a valve cone which substantially consists of a valve shaft projected in a valve disc in such a way that a hollow cone is formed. The valve cone or at least the shaft thereof is made of a typical valve steel consisting of a nitride forming base alloy up to the hollow cone area. The aim of said invention is to improve said gas shuttle valve in such a way that even the parts made of the typical valve steel exhibit a good anti-corrosive protection. For this purpose, the valve cone is provided at least partial area with an anti-corrosive layer in the form of a nitride layer, which is produced by the nitride forming base alloy conversion by plasma nitriding or plasma nitrocarburising in a nitrogenous atmosphere.
Description
GAS EXCHANGE VALVE HAVING CORROSION PROTECTION LAYER
The present invention relates to a gas exchange valve of an internal combustion engine having a valve cone essentially made of a valve shaft, which passes into a valve disk while forming a hollow cone.
Gas exchange valves, i.e., inlet and outlet valves for opening and closing the gas channel of the internal combustion engine, are subjected to great mechanical and thermal strains and corrosion attacks by the combustion gases. Only high-alloy steels of great heat resistance and good scaling resistance may meet the strains, in particular of the outlet valves.
Multiple measures have already become known for increasing the service life of such gas exchange valves. Thus, for example, the valve disk is armored on the sealing face using an especially resistant CrNi alloy.
As suggested in DE 43 41 811 Al, for example, in addition to the armoring described above, the service life of the outlet valve may be increased multiple times in highly-strained engines by a rotating device in the form of a propeller, which is attached to the valve shaft. Because of the forced rotation due to the outflowing exhaust gas, which excites the propeller, the valve shaft ends and disks remain free of deposits and single-sided heating may not cause leaks of the disk.
However, the other parts of the gas exchange valve are also subject to varying requirements in regard to heat, fatigue, and corrosion resistance.
The present invention relates to a gas exchange valve of an internal combustion engine having a valve cone essentially made of a valve shaft, which passes into a valve disk while forming a hollow cone.
Gas exchange valves, i.e., inlet and outlet valves for opening and closing the gas channel of the internal combustion engine, are subjected to great mechanical and thermal strains and corrosion attacks by the combustion gases. Only high-alloy steels of great heat resistance and good scaling resistance may meet the strains, in particular of the outlet valves.
Multiple measures have already become known for increasing the service life of such gas exchange valves. Thus, for example, the valve disk is armored on the sealing face using an especially resistant CrNi alloy.
As suggested in DE 43 41 811 Al, for example, in addition to the armoring described above, the service life of the outlet valve may be increased multiple times in highly-strained engines by a rotating device in the form of a propeller, which is attached to the valve shaft. Because of the forced rotation due to the outflowing exhaust gas, which excites the propeller, the valve shaft ends and disks remain free of deposits and single-sided heating may not cause leaks of the disk.
However, the other parts of the gas exchange valve are also subject to varying requirements in regard to heat, fatigue, and corrosion resistance.
Different requirements in regard to the heat, fatigue, and corrosion resistance in the various temperature zones of the valve cone are known to be taken into consideration in that the valve disk is produced from a material having high temperature and burn-off resistance, while the valve shaft including the propeller comprises a material having lower notch sensitivity and higher fatigue resistance, i.e., has sufficient toughness to counter the bending stresses occurring in this area. A material made of a typical valve steel or made of a super alloy, such as NiCr2OTiAl, is preferably used for the valve disk and a material made of a typical valve steel, such as X45CrSi9-3, is preferably used for the valve shaft including propeller. This is because steels made of a nickel-based alloy used to avoid corrosion are known to be very expensive, so that the gas exchange valve is extensively manufactured from the typical valve steel, such as X45CrSi9-3, where this is acceptable.
Furthermore, it has also already been recognized that a further aspect of the strain of a gas exchange valve comprises valve shaft and hollow cone being attacked by wet corrosion (condensation) because the combustion gases fall below the dew point during the engine shutdown.
However, hardening methods in the form of plasma nitration or plasma nitro-carburization in nitride-forming steels are already known.
In general, plasma nitration/plasma nitro-carburization are understood as hardening of surface layers of steels, nitrogen and/or carbon atoms diffusing in and reacting in a thin surface layer with iron to form nitrides and/or carbon nitrides, the bonding layer (VS). In the adjoining diffusion layer (DS), the nitrogen is first partially precipitated as a nitride upon cooling and then causes the hardness increase. The hardness itself is a function of the types of nitrides.
Nitration times and layers differ depending on how the nitrogen is caused to react with the steel. In other words, there is diffusion saturation of the boundary layer of a material with nitrogen to increase hardness, wear resistance, fatigue strength, or corrosion resistance. The boundary layer comprises an external nitride and/or carbon nitride layer (bonding layer) and an adjoining layer made of mixed crystals enriched with nitrogen and precipitated nitrides (diffusion layer) after the nitration/nitro-carburization.
The nitration times may be shortened by ionization of the nitrogen by glow discharge, so-called plasma nitration (plasma nitration at 450 C to 550 C).
In nitro-carburization, in which the treatment agent also contains components discharging carbon in addition to nitrogen, nitro-carburization may be performed in powder, salt bath, gas, or plasma (plasma nitro-carburization at 500 C to 590 C, preferably at approximately 520 C).
Proceeding from this, it is the object of the present invention to refine a gas exchange valve forming the species in such a way that its parts which comprise the typical valve steels described at the beginning also have good corrosion protection.
This object is achieved by the characterizing features of Claim 1 for a gas exchange valve of the type according to the species.
If the valve body of the gas exchange valve is implemented in one piece and the valve disk is armored on the sealing face and/or on the seat area as described at the beginning, the nitride and/or carbon nitride layer is preferably provided completely on the valve shaft and the hollow cone up to the armored sealing face.
The present invention is explained on the basis of the single figure:
The gas exchange valve, in particular an outlet valve (1) for an internal combustion engine, has a rotating device in the form of a propeller (3) situated on its valve shaft (2). The valve disk (4) is armored on its sealing face (5) . The wings (6) of the propeller (3) are milled out of the rotating shape of the propeller.
Furthermore, different requirements in regard to heat, fatigue, and corrosion resistance in the various temperature zones of the valve cone (1) are taken into consideration in that the valve disk (4) is produced from a material having high temperature and burn-off resistance, while the valve shaft (2) including the propeller (3) comprises a material having lower notch sensitivity and higher fatigue strength, i.e., having sufficient toughness to counter the bending stresses occurring in this area. A material made of a typical valve steel or a super alloy, such as NiCr2OTiAl, is preferably used for the valve disk (4) and a material made of a hot forming steel, such as X45CrSi9-3, is preferably used for the valve shaft (2) having propeller (3). The valve disk (4) is connected to the valve shaft (2) by a friction weld (7).
In the exemplary outlet valve (1) shown here, the valve cone is provided in at least partial areas with a corrosion protection layer in the form of a nitration layer (8), the corrosion protection layer being generated by reacting the nitride-forming base alloy by plasma nitration or plasma nitro-carburization in a nitrogen or nitrogen-carbon atmosphere.
In a preferred way, in the two-part embodiment of a gas exchange valve here, the complete valve shaft (2) up to the friction weld (7), at which the hot working steel material is also delimited, is provided with the nitration layer (8), the area of the hollow cone (11) remains open. Of course, in general, both in the one-part and also in the multipart embodiment of a gas exchange valve, the two front faces on the valve disk (4) and on the valve shaft (2) may remain left out in regard to the nitride and/or carbon nitride layer (8).
However, preferably in the one-part embodiment, the complete valve cone (1) up to the armored valve seat area (5) of the valve disk (4) and also up to its disk floor and the valve shaft front side, may be provided with the nitration layer (8).
In the gas exchange valve according to the present invention, the surface is converted in such a way that a hard, wear-resistant boundary layer results. For this purpose, the valve cone blank is processed, either in the form of the valve shaft or in its entirety with valve shaft (2) and valve plate (4), over all manufacturing steps in such a way that it is provided in its final surface roughness, and the plasma nitration and/or plasma nitro-carburization is subsequently performed. Post-treatment of the nitrated gas exchange valve is possible but not necessary (however, the post-treatment is not to be performed in the areas ofthe gas exchange valve to be protected from corrosion so as not to remove the bonding layer generated). For example, the valve cone (1) may be ground after the nitration.
Furthermore, it has also already been recognized that a further aspect of the strain of a gas exchange valve comprises valve shaft and hollow cone being attacked by wet corrosion (condensation) because the combustion gases fall below the dew point during the engine shutdown.
However, hardening methods in the form of plasma nitration or plasma nitro-carburization in nitride-forming steels are already known.
In general, plasma nitration/plasma nitro-carburization are understood as hardening of surface layers of steels, nitrogen and/or carbon atoms diffusing in and reacting in a thin surface layer with iron to form nitrides and/or carbon nitrides, the bonding layer (VS). In the adjoining diffusion layer (DS), the nitrogen is first partially precipitated as a nitride upon cooling and then causes the hardness increase. The hardness itself is a function of the types of nitrides.
Nitration times and layers differ depending on how the nitrogen is caused to react with the steel. In other words, there is diffusion saturation of the boundary layer of a material with nitrogen to increase hardness, wear resistance, fatigue strength, or corrosion resistance. The boundary layer comprises an external nitride and/or carbon nitride layer (bonding layer) and an adjoining layer made of mixed crystals enriched with nitrogen and precipitated nitrides (diffusion layer) after the nitration/nitro-carburization.
The nitration times may be shortened by ionization of the nitrogen by glow discharge, so-called plasma nitration (plasma nitration at 450 C to 550 C).
In nitro-carburization, in which the treatment agent also contains components discharging carbon in addition to nitrogen, nitro-carburization may be performed in powder, salt bath, gas, or plasma (plasma nitro-carburization at 500 C to 590 C, preferably at approximately 520 C).
Proceeding from this, it is the object of the present invention to refine a gas exchange valve forming the species in such a way that its parts which comprise the typical valve steels described at the beginning also have good corrosion protection.
This object is achieved by the characterizing features of Claim 1 for a gas exchange valve of the type according to the species.
If the valve body of the gas exchange valve is implemented in one piece and the valve disk is armored on the sealing face and/or on the seat area as described at the beginning, the nitride and/or carbon nitride layer is preferably provided completely on the valve shaft and the hollow cone up to the armored sealing face.
The present invention is explained on the basis of the single figure:
The gas exchange valve, in particular an outlet valve (1) for an internal combustion engine, has a rotating device in the form of a propeller (3) situated on its valve shaft (2). The valve disk (4) is armored on its sealing face (5) . The wings (6) of the propeller (3) are milled out of the rotating shape of the propeller.
Furthermore, different requirements in regard to heat, fatigue, and corrosion resistance in the various temperature zones of the valve cone (1) are taken into consideration in that the valve disk (4) is produced from a material having high temperature and burn-off resistance, while the valve shaft (2) including the propeller (3) comprises a material having lower notch sensitivity and higher fatigue strength, i.e., having sufficient toughness to counter the bending stresses occurring in this area. A material made of a typical valve steel or a super alloy, such as NiCr2OTiAl, is preferably used for the valve disk (4) and a material made of a hot forming steel, such as X45CrSi9-3, is preferably used for the valve shaft (2) having propeller (3). The valve disk (4) is connected to the valve shaft (2) by a friction weld (7).
In the exemplary outlet valve (1) shown here, the valve cone is provided in at least partial areas with a corrosion protection layer in the form of a nitration layer (8), the corrosion protection layer being generated by reacting the nitride-forming base alloy by plasma nitration or plasma nitro-carburization in a nitrogen or nitrogen-carbon atmosphere.
In a preferred way, in the two-part embodiment of a gas exchange valve here, the complete valve shaft (2) up to the friction weld (7), at which the hot working steel material is also delimited, is provided with the nitration layer (8), the area of the hollow cone (11) remains open. Of course, in general, both in the one-part and also in the multipart embodiment of a gas exchange valve, the two front faces on the valve disk (4) and on the valve shaft (2) may remain left out in regard to the nitride and/or carbon nitride layer (8).
However, preferably in the one-part embodiment, the complete valve cone (1) up to the armored valve seat area (5) of the valve disk (4) and also up to its disk floor and the valve shaft front side, may be provided with the nitration layer (8).
In the gas exchange valve according to the present invention, the surface is converted in such a way that a hard, wear-resistant boundary layer results. For this purpose, the valve cone blank is processed, either in the form of the valve shaft or in its entirety with valve shaft (2) and valve plate (4), over all manufacturing steps in such a way that it is provided in its final surface roughness, and the plasma nitration and/or plasma nitro-carburization is subsequently performed. Post-treatment of the nitrated gas exchange valve is possible but not necessary (however, the post-treatment is not to be performed in the areas ofthe gas exchange valve to be protected from corrosion so as not to remove the bonding layer generated). For example, the valve cone (1) may be ground after the nitration.
It may be specified as characteristic for the generated corrosion protection layers that the nitration layer has a diffusion layer (9) having a thickness (nitration hardness depth) of 0.1 mm to 0.3 mm and a bonding layer (10) built up thereon of 3 pm to 15 pm and offers a surface hardness greater than 750 HV (Vickers).
If a thickness around 10 pm is to be achieved for the bonding layer, plasma nitro-carburization with the addition of carbon is preferred.
Significantly improved corrosion protection and an increase of the alternating fatigue strength are achieved by the plasma nitration and/or plasma nitro-carburization of the valve cone (1), i.e., longer maintenance intervals and/or component service lives are achieved and cracking due to bending strains is counteracted.
If a thickness around 10 pm is to be achieved for the bonding layer, plasma nitro-carburization with the addition of carbon is preferred.
Significantly improved corrosion protection and an increase of the alternating fatigue strength are achieved by the plasma nitration and/or plasma nitro-carburization of the valve cone (1), i.e., longer maintenance intervals and/or component service lives are achieved and cracking due to bending strains is counteracted.
Claims (4)
1. A gas exchange valve of an internal combustion engine having a valve cone (1) essentially made of a valve shaft (2), which passes into a valve disk (4) while forming a hollow cone (11), and the valve cone (1) or at least the valve shaft (2) being manufactured from a typical valve steel made of a nitride-forming based alloy up into the area of the hollow cone (11), characterized in that the valve cone (1) is provided at least in partial areas with a corrosion protection layer (8) in the form of a nitride and/or carbon nitride layer, the corrosion protection layer (8) being generated by reacting the nitride-forming base alloy by plasma nitration or plasma nitro-carburization in a nitrogen atmosphere.
2. The gas exchange valve according to Claim 1, characterized in that, in a one-part embodiment, the complete valve cone (1), up to an armored valve seat area of the valve disk (4) and up to its disk floor and the valve shaft front side, is provided with the nitration layer (8).
3. The gas exchange valve according to Claim 1, characterized in that, in a two-part embodiment, the valve shaft (2) is provided, at least on its external faces coming into contact with the combustion gases, completely with the nitration layer (8) up to a boundary face (7), at which the hot working steel material is also delimited, while the valve plate (4) and possibly the area of the hollow cone (11) remain open in regard to the nitration layer (8).
4. The gas exchange valve according to one of the preceding claims, characterized in that the nitration layer (8) has a diffusion layer thickness (9) (nitration hardness depth) of 0.1 mm to 0.3 mm and a bonding layer (10) built up thereon of 3 µm to 15 µm and a surface hardness greater than 750 HV (Vickers).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005013088.7 | 2005-03-18 | ||
| DE102005013088A DE102005013088B4 (en) | 2005-03-18 | 2005-03-18 | Gas exchange valve with corrosion protection layer |
| PCT/EP2006/002292 WO2006097264A1 (en) | 2005-03-18 | 2006-03-14 | Gas shuttle valve provided with an anti-corrosive layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2601053A1 true CA2601053A1 (en) | 2006-09-21 |
Family
ID=36602668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002601053A Abandoned CA2601053A1 (en) | 2005-03-18 | 2006-03-14 | Gas exchange valve having corrosion protection layer |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US20080149062A1 (en) |
| EP (1) | EP1864003A1 (en) |
| JP (1) | JP2008533372A (en) |
| KR (1) | KR20070112287A (en) |
| CN (1) | CN101142379A (en) |
| CA (1) | CA2601053A1 (en) |
| DE (1) | DE102005013088B4 (en) |
| NO (1) | NO20075320L (en) |
| RU (1) | RU2007138648A (en) |
| WO (1) | WO2006097264A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008018875A1 (en) | 2008-04-14 | 2009-10-15 | Märkisches Werk GmbH | Exhaust valve on a reciprocating engine |
| JP4510126B2 (en) | 2008-05-13 | 2010-07-21 | エムエーエヌ・ディーゼル・フィリアル・アフ・エムエーエヌ・ディーゼル・エスイー・ティスクランド | Exhaust valves for large two-cycle diesel engines, processes for reducing NOx formation in such engines, and such engines |
| DE102008061237A1 (en) | 2008-12-09 | 2010-06-10 | Man Diesel Se | Gas exchange valve and method for its production |
| WO2010083831A1 (en) * | 2009-01-23 | 2010-07-29 | Man Diesel & Turbo, Filial Af Man Diesel & Turbo Se, Tyskland | A movable wall member in form of an exhaust valve spindle or a piston for an internal combustion engine, and a method of manufacturing such a member |
| KR101274239B1 (en) * | 2010-12-02 | 2013-06-11 | 기아자동차주식회사 | Intake and exhaust valve for vehicle |
| DE102012202859A1 (en) | 2012-02-24 | 2013-08-29 | Mahle International Gmbh | Valve system for charge exchange control |
| US9051910B2 (en) | 2013-01-31 | 2015-06-09 | Caterpillar Inc. | Valve assembly for fuel system and method |
| DE102013203441A1 (en) | 2013-02-28 | 2014-08-28 | Bayerische Motoren Werke Aktiengesellschaft | Operating method for a single-axle roll stabilization system of a two-axle, two-lane vehicle |
| DE102013203443A1 (en) * | 2013-02-28 | 2014-08-28 | Mahle International Gmbh | Metallic hollow valve |
| DE102013210900A1 (en) | 2013-06-11 | 2014-12-11 | Mahle International Gmbh | Gas exchange valve of an internal combustion engine |
| CN103498711A (en) * | 2013-10-21 | 2014-01-08 | 济南沃德汽车零部件有限公司 | Air valve with alloy arranged on plate conical face in bead-weld mode and nitride layer reserved on alloy layer |
| KR102309162B1 (en) * | 2017-05-17 | 2021-10-05 | 페데랄-모굴 밸브트레인 게엠베하 | POPPET VALVE AND METHOD FOR PRODUCTION THEREOF |
| DE102019207536A1 (en) * | 2019-05-23 | 2020-11-26 | Mahle International Gmbh | Gas exchange valve |
| CN114810270B (en) * | 2022-04-07 | 2023-08-01 | 重庆乐瑞斯科技有限公司 | Valve mechanism with self-adaptive lift adjustment function |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1902676A (en) * | 1929-12-19 | 1933-03-21 | Sutton Hubert | Hardening alloy steels |
| US2745777A (en) * | 1951-12-20 | 1956-05-15 | Armco Steel Corp | Internal combustion engine valves and the like |
| GB1351234A (en) * | 1970-07-21 | 1974-04-24 | Nissan Motor | Process for forming a soft nitride layer in a metal surface |
| DE69330781T2 (en) * | 1992-07-16 | 2002-04-18 | Nippon Steel Corp | TIT ALLOY ROD FOR PRODUCING ENGINE VALVES |
| JPH06146825A (en) * | 1992-11-04 | 1994-05-27 | Fuji Oozx Inc | Titanium engine valve |
| DE4341811A1 (en) * | 1993-12-08 | 1995-06-14 | Man B & W Diesel Ag | Gas exchange valve for an internal combustion engine |
| US5441235A (en) * | 1994-05-20 | 1995-08-15 | Eaton Corporation | Titanium nitride coated valve and method for making |
| DE19618477C2 (en) * | 1996-05-08 | 2000-08-03 | Trw Deutschland Gmbh | Manufacturing process for a nitrided bimetal valve |
| US5934238A (en) * | 1998-02-20 | 1999-08-10 | Eaton Corporation | Engine valve assembly |
| US5960760A (en) * | 1998-02-20 | 1999-10-05 | Eaton Corporation | Light weight hollow valve assembly |
| JP2001050020A (en) * | 1999-05-31 | 2001-02-23 | Nippon Piston Ring Co Ltd | Valve device for internal combustion engine |
| EP1146137A1 (en) * | 1999-11-10 | 2001-10-17 | Cemm Co., Ltd | Method of nitriding iron group alloy base material |
| JP2003307105A (en) * | 2002-04-12 | 2003-10-31 | Fuji Oozx Inc | Engine valve |
| SE525291C2 (en) * | 2002-07-03 | 2005-01-25 | Sandvik Ab | Surface-modified stainless steel |
| US6912984B2 (en) * | 2003-03-28 | 2005-07-05 | Eaton Corporation | Composite lightweight engine poppet valve |
-
2005
- 2005-03-18 DE DE102005013088A patent/DE102005013088B4/en not_active Revoked
-
2006
- 2006-03-14 US US11/886,649 patent/US20080149062A1/en not_active Abandoned
- 2006-03-14 CN CNA2006800086932A patent/CN101142379A/en active Pending
- 2006-03-14 EP EP06707539A patent/EP1864003A1/en not_active Withdrawn
- 2006-03-14 KR KR1020077023714A patent/KR20070112287A/en not_active Application Discontinuation
- 2006-03-14 RU RU2007138648/06A patent/RU2007138648A/en not_active Application Discontinuation
- 2006-03-14 JP JP2008501214A patent/JP2008533372A/en not_active Withdrawn
- 2006-03-14 WO PCT/EP2006/002292 patent/WO2006097264A1/en active Application Filing
- 2006-03-14 CA CA002601053A patent/CA2601053A1/en not_active Abandoned
-
2007
- 2007-10-17 NO NO20075320A patent/NO20075320L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NO20075320L (en) | 2007-12-13 |
| DE102005013088A1 (en) | 2006-09-21 |
| CN101142379A (en) | 2008-03-12 |
| US20080149062A1 (en) | 2008-06-26 |
| WO2006097264A1 (en) | 2006-09-21 |
| RU2007138648A (en) | 2009-04-27 |
| DE102005013088B4 (en) | 2006-12-28 |
| KR20070112287A (en) | 2007-11-22 |
| JP2008533372A (en) | 2008-08-21 |
| EP1864003A1 (en) | 2007-12-12 |
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