JP2017206963A - Engine valve and method for manufacturing the same - Google Patents

Engine valve and method for manufacturing the same Download PDF

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JP2017206963A
JP2017206963A JP2016097763A JP2016097763A JP2017206963A JP 2017206963 A JP2017206963 A JP 2017206963A JP 2016097763 A JP2016097763 A JP 2016097763A JP 2016097763 A JP2016097763 A JP 2016097763A JP 2017206963 A JP2017206963 A JP 2017206963A
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umbrella
nitride layer
valve
engine valve
outer peripheral
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JP6702795B2 (en
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智昭 井上
Tomoaki Inoue
智昭 井上
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Aisan Industry Co Ltd
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Aisan Industry Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To inhibit generation of rust due to a nitrided layer of an umbrella surface of an umbrella part in an engine valve formed with a nitrided layer covering the umbrella surface and an umbrella reverse surface of the umbrella part of a valve body and an outer peripheral surface of a stem part.SOLUTION: In the engine valve, the nitrided layer 30 is formed at the valve body 11 having the umbrella part 13 of the engine valve 10 and the stem part. Part 31 of the nitrided layer 30 covering the umbrella surface 20 of the umbrella part 13 is removed by machine work.SELECTED DRAWING: Figure 2

Description

本発明は、エンジン（内燃機関）に用いられるエンジンバルブとその製造方法に関する。   The present invention relates to an engine valve used in an engine (internal combustion engine) and a method for manufacturing the same.

エンジンバルブには、傘部及びステム部を有するバルブ本体に窒化処理を施すことにより、バルブ本体の軸端面を除いた残りの部分を覆う窒化層が形成されたものがある（例えば、特許文献１参照）。なお、窒化処理は、バルブ本体の各部の耐摩耗性を向上させるために施される表面処理である。   Some engine valves are formed with a nitrided layer covering the remaining part of the valve body except the shaft end surface by performing nitriding on the valve body having an umbrella part and a stem part (for example, Patent Document 1). reference). The nitriding treatment is a surface treatment applied to improve the wear resistance of each part of the valve body.

特開２００７−４０１２３号公報JP 2007-40123 A

エンジンの燃焼室内は、燃料の燃焼時に発生する水分や凝縮水によって、高温で多湿な環境である。このため、エンジンバルブにおいて、傘部の燃焼室に露出する傘表面に錆が発生することがある。特に、燃料がＬＰＧのエンジンの場合、燃焼時に発生する水分量が多いために、傘表面に窒化層による錆が発生しやすいという問題があった。これは、バルブ本体に窒化処理を施すことによって、素材表面の不動態皮膜が破壊され、耐食性の低いクロム化合物が生成されるためと考えられる。本発明の課題は、バルブ本体の傘部の傘表面及び傘裏面とステム部の外周面とを覆う窒化層が形成されたエンジンバルブにおける傘部の傘表面の窒化層による錆の発生を抑制することのできるエンジンバルブとその製造方法を提供することにある。   The combustion chamber of the engine is a high temperature and humidity environment due to moisture and condensed water generated during fuel combustion. For this reason, in the engine valve, rust may be generated on the surface of the umbrella exposed to the combustion chamber of the umbrella. In particular, when the fuel is an LPG engine, there is a problem that rust due to a nitride layer is likely to occur on the umbrella surface because of the large amount of water generated during combustion. This is presumably because the passive film on the surface of the material is destroyed by nitriding the valve body, and a chromium compound with low corrosion resistance is generated. The subject of this invention suppresses generation | occurrence | production of the rust by the nitride layer of the umbrella surface of the umbrella part in the engine valve in which the nitride layer which covers the umbrella surface of the umbrella part of a valve body, the umbrella back surface, and the outer peripheral surface of a stem part was formed. It is an object to provide an engine valve and a method for manufacturing the same.

前記課題は、本発明のエンジンバルブとその製造方法により解決することができる。第１の発明は、傘部及びステム部を有するバルブ本体の前記傘部の傘表面及び傘裏面と前記ステム部の外周面とを覆う窒化層が形成されたエンジンバルブにおいて、前記傘部の傘表面を覆う前記窒化層の少なくとも一部を機械加工により除去する、エンジンバルブの製造方法である。この構成によると、バルブ本体の傘部の傘表面及び傘裏面とステム部の外周面とを覆う窒化層が形成されたエンジンバルブにおいて、傘部の傘表面を覆う窒化層の少なくとも一部が機械加工により除去される。したがって、錆の原因である窒化層が除去されることにより、傘部の傘表面の窒化層による錆の発生を抑制することができる。   The above-described problems can be solved by the engine valve and the manufacturing method thereof according to the present invention. According to a first aspect of the present invention, there is provided an engine valve in which a nitride layer that covers an umbrella surface and an umbrella back surface of an umbrella portion and an outer peripheral surface of the stem portion of a valve body having an umbrella portion and a stem portion is formed. In this method, at least a part of the nitride layer covering the surface is removed by machining. According to this configuration, in the engine valve in which the nitride layer covering the umbrella surface and the back surface of the umbrella portion and the outer peripheral surface of the stem portion is formed, at least a part of the nitride layer covering the umbrella surface of the umbrella portion is a machine. It is removed by processing. Therefore, by removing the nitride layer that causes rust, the generation of rust due to the nitride layer on the umbrella surface of the umbrella portion can be suppressed.

第２の発明は、第１の発明において、前記傘部の外周端面を覆う前記窒化層を機械加工により除去する、エンジンバルブの製造方法である。この構成によると、傘部の外周端面を覆う窒化層が機械加工により除去される。したがって、錆の原因である窒化層が除去されることにより、傘部の外周端面の窒化層による錆の発生を抑制することができる。   2nd invention is a manufacturing method of the engine valve which removes the said nitrided layer which covers the outer peripheral end surface of the said umbrella part by machining in 1st invention. According to this configuration, the nitride layer covering the outer peripheral end face of the umbrella portion is removed by machining. Therefore, by removing the nitride layer that causes rust, the generation of rust due to the nitride layer on the outer peripheral end face of the umbrella portion can be suppressed.

第３の発明は、第１又は２の発明のエンジンバルブの製造方法により製造されたエンジンバルブである。   A third invention is an engine valve manufactured by the method for manufacturing an engine valve of the first or second invention.

第４の発明は、第３の発明において、前記傘部の傘表面の基材が全面的に露出されている、エンジンバルブである。この構成によると、傘部の傘表面の窒化層による錆の発生を全面的に抑制することができる。   4th invention is an engine valve in which the base material of the umbrella surface of the said umbrella part is exposed entirely in 3rd invention. According to this structure, generation | occurrence | production of the rust by the nitride layer of the umbrella surface of an umbrella part can be suppressed entirely.

第５の発明は、第３又は４の発明において、前記傘部の弁フェース面を覆う窒化層が形成されている、エンジンバルブである。この構成によると、傘部の弁フェース面を覆う窒化層により、弁フェース面の耐摩耗性を向上することができる。   A fifth invention is an engine valve according to the third or fourth invention, wherein a nitride layer covering the valve face of the umbrella portion is formed. According to this configuration, the wear resistance of the valve face can be improved by the nitride layer covering the valve face of the umbrella.

一実施形態にかかるエンジンバルブを示す半断面図である。It is a half sectional view showing an engine valve concerning one embodiment. 傘部を示す断面図である。It is sectional drawing which shows an umbrella part. エンジンバルブの製造工程を示す工程図である。It is process drawing which shows the manufacturing process of an engine valve.

以下、本発明を実施するための形態について図面を用いて説明する。ここでは、インテークバルブとして用いられるエンジンバルブについて例示する。図１はエンジンバルブを示す半断面図である。図１に示すように、エンジンバルブ１０は、バルブ本体１１を主体として形成されている。   Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Here, an engine valve used as an intake valve is illustrated. FIG. 1 is a half sectional view showing an engine valve. As shown in FIG. 1, the engine valve 10 is formed mainly with a valve body 11.

バルブ本体１１は、ステム部１２と傘部１３とを有している。ステム部１２は、丸棒状に形成されている。傘部１３は、ステム部１２の一端部（図１において下端部）に同心状にかつ傘状に広がるように形成されている。バルブ本体１１は、例えば、耐熱鋼（ＳＵＨ３、ＳＵＨ３５等）からなる。また、バルブ本体１１は、例えば、鍛造成形により形成されている。ステム部１２の軸端部に相当するバルブ本体１１の軸端部１５の外周面には、例えば、砥石加工によってコッタ溝１６が形成されている。図２は傘部を示す断面図である。   The valve body 11 has a stem portion 12 and an umbrella portion 13. The stem portion 12 is formed in a round bar shape. The umbrella part 13 is formed to be concentrically and spread in an umbrella shape at one end part (lower end part in FIG. 1) of the stem part 12. The valve body 11 is made of heat resistant steel (SUH3, SUH35, etc.), for example. The valve body 11 is formed by forging, for example. A cotter groove 16 is formed on the outer peripheral surface of the shaft end portion 15 of the valve body 11 corresponding to the shaft end portion of the stem portion 12 by, for example, grinding stone processing. FIG. 2 is a cross-sectional view showing the umbrella portion.

図２に示すように、傘部１３の端面には、傘表面２０が形成されている。傘表面２０は、円環状の平面部２０ａと、平面部２０ａより一段低い凹状に形成された円形状の凹面部２０ｂと、凹面部２０ｂの中央部に形成された半球状の凹曲面部２０ｃとを有している。なお、平面部２０ａと凹面部２０ｂとは、テーパ状の斜面部２０ｄによりなだらかに連続されている。また、凹面部２０ｂと凹曲面部２０ｃとは、断面円弧状の斜面部２０ｅによりなだらかに連続されている。   As shown in FIG. 2, an umbrella surface 20 is formed on the end surface of the umbrella portion 13. The umbrella surface 20 includes an annular flat surface portion 20a, a circular concave surface portion 20b formed in a concave shape one step lower than the flat surface portion 20a, and a hemispherical concave curved surface portion 20c formed at the center of the concave surface portion 20b. have. The flat surface portion 20a and the concave surface portion 20b are smoothly continued by a tapered inclined surface portion 20d. Further, the concave surface portion 20b and the concave curved surface portion 20c are smoothly continued by a slope portion 20e having an arcuate cross section.

傘部１３において、傘裏側の外周部には、テーパ状の弁フェース面２２が形成されている。弁フェース面２２は、傘部１３の外周端から弁裏方向（図２において上方）に向かって小径化されたテーパ面からなる。なお、弁フェース面２２（詳しくは、後述する窒化層における弁フェース面２２を覆う部分３３）は、エンジンバルブ１０の開閉にともない、エンジンのバルブシート２４に離座及び着座する。   In the umbrella portion 13, a tapered valve face surface 22 is formed on the outer peripheral portion on the back side of the umbrella. The valve face surface 22 is formed of a tapered surface whose diameter is reduced from the outer peripheral end of the umbrella portion 13 toward the valve back direction (upward in FIG. 2). The valve face surface 22 (specifically, a portion 33 covering the valve face surface 22 in a nitride layer described later) is separated from and seated on the valve seat 24 of the engine as the engine valve 10 is opened and closed.

弁フェース面２２の下端部には、弁フェース面２２の大径側の外径と同一の外径を有する円筒状で軸長の短い外周端面２６が形成されている。外周端面２６は、傘部１３の外周端面２６に相当する。傘部１３の傘裏側には、弁フェース面２２の大径側の端部とステム部１２の下端部とをなだらかにつなぐ逆漏斗状の曲面部２７が形成されている。また、傘表面２０及び外周端面２６は、エンジンの燃焼室２９、すなわちバルブシート２４に弁フェース面２２が着座した状態（閉弁状態）において燃焼室２９に面する。なお、弁フェース面２２及び曲面部２７は本明細書でいう「傘裏面」に相当する。   At the lower end portion of the valve face surface 22, a cylindrical outer peripheral end surface 26 having the same outer diameter as the outer diameter on the large diameter side of the valve face surface 22 and having a short axial length is formed. The outer peripheral end surface 26 corresponds to the outer peripheral end surface 26 of the umbrella portion 13. On the umbrella back side of the umbrella portion 13, a reverse funnel-shaped curved surface portion 27 is formed that gently connects the end portion on the large diameter side of the valve face surface 22 and the lower end portion of the stem portion 12. Further, the umbrella surface 20 and the outer peripheral end face 26 face the combustion chamber 29 in a state where the valve face 22 is seated on the engine combustion chamber 29, that is, the valve seat 24 (valve closed state). The valve face surface 22 and the curved surface portion 27 correspond to the “umbrella back surface” in this specification.

バルブ本体１１は、窒化層３０により全面的に覆われている（図１参照）。その後、図２に示すように、傘部１３の傘表面２０を覆う窒化層３０の部分３１、及び、外周端面２６を覆う窒化層３０の部分３２が機械加工（例えば、切削加工）により除去されている。これにより、傘表面２０及び外周端面２６の基材としての地金（耐熱鋼）がそれぞれ全面的に露出されている。なお、上記した以外の部位の窒化層３０は除去されていない。   The valve body 11 is entirely covered with a nitride layer 30 (see FIG. 1). After that, as shown in FIG. 2, the portion 31 of the nitride layer 30 covering the umbrella surface 20 of the umbrella portion 13 and the portion 32 of the nitride layer 30 covering the outer peripheral end surface 26 are removed by machining (for example, cutting). ing. Thereby, the bare metal (heat-resistant steel) as the base material of the umbrella surface 20 and the outer peripheral end face 26 is exposed entirely. Note that the nitride layer 30 at portions other than those described above is not removed.

次に、エンジンバルブ１０の製造方法について説明する。図３はエンジンバルブの製造工程を示す工程図である。図３に示すように、本エンジンバルブの製造方法は、鍛造工程（図３（ａ）参照）と、窒化処理工程（図３（ｂ）参照）と、窒化層除去工程（図３（ｃ）参照）と、を備えている。   Next, a method for manufacturing the engine valve 10 will be described. FIG. 3 is a process diagram showing the manufacturing process of the engine valve. As shown in FIG. 3, the engine valve manufacturing method includes a forging step (see FIG. 3A), a nitriding step (see FIG. 3B), and a nitride layer removing step (FIG. 3C). Reference).

［鍛造工程］図３（ａ）に示すように、中実状のバルブ本体１１が準備される。バルブ本体１１は、例えば、軸状素材をアップセット鍛造等により鍛造成形することによって形成されている。そのバルブ本体１１の軸端部１５の外周面には、例えば、砥石加工によってコッタ溝１６が形成されている。 [Forging Step] As shown in FIG. 3A, a solid valve body 11 is prepared. The valve body 11 is formed, for example, by forging a shaft-shaped material by upset forging or the like. A cotter groove 16 is formed on the outer peripheral surface of the shaft end portion 15 of the valve body 11 by, for example, grinding stone processing.

［窒化処理工程］図３（ｂ）に示すように、バルブ本体１１に窒化処理を施すことにより、バルブ本体１１を全面的に覆う窒化層３０が形成される。窒化処理としては、例えば、塩浴軟窒化処理が好ましい。塩浴軟窒化処理は、どぶ漬け等によって、一度に大量の製品を簡単に効率よく処理することができる。 [Nitriding Step] As shown in FIG. 3B, a nitriding treatment is performed on the valve body 11 to form a nitride layer 30 that covers the entire surface of the valve body 11. As the nitriding treatment, for example, salt bath soft nitriding treatment is preferable. The salt bath soft nitriding treatment can easily and efficiently process a large amount of products at once by soaking.

［窒化層除去工程］図３（ｃ）に示すように、バルブ本体１１の傘部１３の傘表面２０及び外周端面２６を覆う窒化層３０の部分３１及び３２（図２参照）が機械加工により全面的に除去される。傘表面２０のうち、例えば、凹曲面部２０ｃにはリーマ加工が用いられ、残りの部分には切削加工が用いられている。また、外周端面２６には、切削加工が用いられている。これにより、傘表面２０及び外周端面２６の基材がそれぞれ全面的に露出されている。なお、上記した以外の部位の窒化層３０は除去されない。 [Nitride Layer Removal Step] As shown in FIG. 3C, portions 31 and 32 (see FIG. 2) of the nitride layer 30 covering the umbrella surface 20 and the outer peripheral end face 26 of the umbrella portion 13 of the valve body 11 are machined. It is completely removed. Of the umbrella surface 20, for example, a reamer process is used for the concave curved surface part 20c, and a cutting process is used for the remaining part. The outer peripheral end face 26 is cut. Thereby, the base material of the umbrella surface 20 and the outer peripheral end surface 26 is respectively exposed entirely. Note that the nitride layer 30 at portions other than those described above is not removed.

前記したエンジンバルブ１０の製造方法によると、バルブ本体１１を全面的に覆う窒化層３０が形成されたエンジンバルブ１０において、傘部１３の傘表面２０を覆う窒化層３０の部分３１（図２参照）が機械加工により全面的に除去される。したがって、錆の原因である窒化層３０の部分３１が除去されることにより、その窒化層３０の部分３１による錆の発生を抑制することができる。   According to the manufacturing method of the engine valve 10 described above, in the engine valve 10 in which the nitride layer 30 that covers the entire valve body 11 is formed, the portion 31 of the nitride layer 30 that covers the umbrella surface 20 of the umbrella portion 13 (see FIG. 2). ) Is completely removed by machining. Therefore, by removing the portion 31 of the nitride layer 30 that is the cause of rust, generation of rust by the portion 31 of the nitride layer 30 can be suppressed.

また、傘部１３の外周端面２６を覆う窒化層３０の部分３２（図２参照）が機械加工により全面的に除去される。したがって、錆の原因である窒化層３０の部分３２が除去されることにより、その窒化層３０の部分３２による錆の発生を抑制することができる。   Further, the portion 32 (see FIG. 2) of the nitride layer 30 covering the outer peripheral end face 26 of the umbrella portion 13 is entirely removed by machining. Therefore, by removing the portion 32 of the nitride layer 30 that is the cause of rust, generation of rust by the portion 32 of the nitride layer 30 can be suppressed.

また、燃焼室２９側に露出する全ての面（傘表面２０、及び、外周端面２６）を覆う窒化層３０の部分３１及び３２が除去されているため、その窒化層３０の部分３１及び３２による錆の発生を抑制することができる。   Further, since the portions 31 and 32 of the nitride layer 30 covering all the surfaces exposed to the combustion chamber 29 side (the umbrella surface 20 and the outer peripheral end surface 26) are removed, the portions 31 and 32 of the nitride layer 30 are used. Generation of rust can be suppressed.

前記したエンジンバルブ１０の製造方法により製造されたエンジンバルブ１０によると、傘部１３の傘表面２０の基材が全面的に露出されている。したがって、傘部１３の傘表面２０の窒化層３０の部分３１による錆の発生を抑制することができる。   According to the engine valve 10 manufactured by the method for manufacturing the engine valve 10 described above, the base material of the umbrella surface 20 of the umbrella portion 13 is exposed entirely. Therefore, generation | occurrence | production of the rust by the part 31 of the nitride layer 30 of the umbrella surface 20 of the umbrella part 13 can be suppressed.

また、傘部１３の弁フェース面２２を覆う窒化層３０の部分３３により、弁フェース面２２の耐摩耗性を向上することができる。   Further, the wear resistance of the valve face 22 can be improved by the portion 33 of the nitride layer 30 covering the valve face 22 of the umbrella part 13.

［他の実施形態］本発明は実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における変更が可能である。例えば、本発明は、インテークバルブに限らず、エキゾーストバルブに適用してもよい。また、エンジンバルブ１０をエキゾーストバルブとして用いる場合、バルブ本体１１は、例えば、オーステナイト系耐熱鋼、チタン合金等から形成するとよい。また、窒化処理としては、塩浴軟窒化処理に限らず、プラズマ窒化処理、ガス窒化処理等を用いてもよい。また、傘部１３の弁フェース面２２を覆う窒化層３０の部分３３は除去してもよい。この場合、弁フェースに、盛金材、例えば、ステライト系盛金材を肉盛溶接するとよい。また、バルブ本体１１の軸端部１５の軸端面（図１において上端面）は、窒化層３０で覆わなくてもよい。 [Other Embodiments] The present invention is not limited to the embodiments and can be modified without departing from the gist of the present invention. For example, the present invention is not limited to an intake valve, and may be applied to an exhaust valve. When the engine valve 10 is used as an exhaust valve, the valve body 11 is preferably formed from, for example, austenitic heat resistant steel, titanium alloy, or the like. The nitriding treatment is not limited to the salt bath soft nitriding treatment, and plasma nitriding treatment, gas nitriding treatment, or the like may be used. Further, the portion 33 of the nitride layer 30 covering the valve face 22 of the umbrella portion 13 may be removed. In this case, a cladding material, for example, a stellite-based cladding material may be overlay welded to the valve face. Further, the shaft end surface (upper end surface in FIG. 1) of the shaft end portion 15 of the valve body 11 may not be covered with the nitride layer 30.

また、傘部１３において、傘表面２０を覆う窒化層３０の部分３１の各部、すなわち、平面部２０ａを覆う部分、凹面部２０ｂを覆う部分、凹曲面部２０ｃを覆う部分と、外周端面２６を覆う窒化層３０の部分３２については、選択的に１つ又は複数の部位を除去してもよい。なお、斜面部２０ｄは、平面部２０ａ又は凹面部２０ｂに含むものとする。また、斜面部２０ｅは、凹面部２０ｂ又は凹曲面部２０ｃに含むものとする。この場合、窒化層３０の除去による耐食性の向上効果として、除去面積が広いほど大きい。このため、平面部２０ａを覆う部分、凹面部２０ｂを覆う部分、外周端面２６を覆う部分３２、凹曲面部２０ｃを覆う部分の順で、窒化層３０の除去による耐食性の向上効果が段階的に小さくなる。また、例えば、凹面部２０ｂの窒化層３０のみ除去しない場合、凹面部２０ｂは鍛造肌のまま窒化層３０により覆われている。なお、傘表面２０は、一平面で形成してもよい。   Moreover, in the umbrella part 13, each part of the part 31 of the nitride layer 30 covering the umbrella surface 20, that is, the part covering the flat part 20a, the part covering the concave part 20b, the part covering the concave curved part 20c, and the outer peripheral end face 26 For the portion 32 of the covering nitride layer 30, one or more portions may be selectively removed. In addition, the slope part 20d shall be included in the plane part 20a or the concave-surface part 20b. Further, the inclined surface portion 20e is included in the concave surface portion 20b or the concave curved surface portion 20c. In this case, the effect of improving the corrosion resistance by removing the nitride layer 30 is larger as the removed area is larger. For this reason, the effect of improving the corrosion resistance by removing the nitride layer 30 is stepwise in the order of the portion covering the flat surface portion 20a, the portion covering the concave surface portion 20b, the portion 32 covering the outer peripheral end surface 26, and the portion covering the concave curved surface portion 20c. Get smaller. For example, when only the nitride layer 30 of the concave surface portion 20b is not removed, the concave surface portion 20b is covered with the nitride layer 30 with a forged skin. In addition, you may form the umbrella surface 20 by one plane.

１０…エンジンバルブ
１１…バルブ本体
１２…ステム部
１３…傘部
２０…傘表面
２２…弁フェース面（傘裏面の一部）
２６…外周端面
２７…曲面部（傘裏面の一部）
３０…窒化層
DESCRIPTION OF SYMBOLS 10 ... Engine valve 11 ... Valve body 12 ... Stem part 13 ... Umbrella part 20 ... Umbrella surface 22 ... Valve face surface (a part of umbrella back surface)
26 ... outer peripheral end face 27 ... curved surface part (part of the umbrella back)
30 ... Nitride layer

Claims (5)

傘部及びステム部を有するバルブ本体の前記傘部の傘表面及び傘裏面と前記ステム部の外周面とを覆う窒化層が形成されたエンジンバルブにおいて、
前記傘部の傘表面を覆う前記窒化層の少なくとも一部を機械加工により除去する、エンジンバルブの製造方法。 In the engine valve in which a nitride layer covering the umbrella surface and the back surface of the umbrella part and the outer peripheral surface of the stem part of the valve body having the umbrella part and the stem part is formed,
A method for manufacturing an engine valve, wherein at least part of the nitride layer covering the umbrella surface of the umbrella part is removed by machining. 請求項１に記載のエンジンバルブの製造方法であって、
前記傘部の外周端面を覆う前記窒化層を機械加工により除去する、エンジンバルブの製造方法。 It is a manufacturing method of the engine valve according to claim 1,
A method for manufacturing an engine valve, wherein the nitride layer covering an outer peripheral end face of the umbrella portion is removed by machining. 請求項１又は２に記載のエンジンバルブの製造方法により製造されたエンジンバルブ。   An engine valve manufactured by the method for manufacturing an engine valve according to claim 1. 請求項３に記載のエンジンバルブであって、
前記傘部の傘表面の基材が全面的に露出されている、エンジンバルブ。 The engine valve according to claim 3,
An engine valve in which a base material of an umbrella surface of the umbrella part is exposed entirely. 請求項３又は４に記載のエンジンバルブであって、
前記傘部の弁フェース面を覆う窒化層が形成されている、エンジンバルブ。
The engine valve according to claim 3 or 4,
An engine valve in which a nitride layer covering the valve face surface of the umbrella portion is formed.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101990986B1 (en) * 2018-12-31 2019-06-20 안전공업주식회사 Nitridation surface structure of high power and high temperature engine valve stem and the method of nitride treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101990986B1 (en) * 2018-12-31 2019-06-20 안전공업주식회사 Nitridation surface structure of high power and high temperature engine valve stem and the method of nitride treatment
WO2020141810A1 (en) * 2018-12-31 2020-07-09 안전공업 주식회사 Nitrided surface structure of high-power and high-temperature engine valve stem, and surface nitriding method

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