JP2005105965A - Valve seat for engine and cylinder head for engine - Google Patents

Valve seat for engine and cylinder head for engine Download PDF

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Publication number
JP2005105965A
JP2005105965A JP2003341541A JP2003341541A JP2005105965A JP 2005105965 A JP2005105965 A JP 2005105965A JP 2003341541 A JP2003341541 A JP 2003341541A JP 2003341541 A JP2003341541 A JP 2003341541A JP 2005105965 A JP2005105965 A JP 2005105965A
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Prior art keywords
valve seat
receiving portion
cylinder head
assembly receiving
plating layer
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JP2003341541A
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Japanese (ja)
Inventor
Koichiro Morimoto
耕一郎 森本
Kunio Hanada
久仁夫 花田
Takashi Nishida
隆志 西田
Tomohiro Sakai
智宏 坂井
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Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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Priority to JP2003341541A priority Critical patent/JP2005105965A/en
Priority to CN 200480028417 priority patent/CN1902381A/en
Priority to EP04788362A priority patent/EP1669558A4/en
Priority to US10/572,887 priority patent/US20070101964A1/en
Priority to KR1020067005967A priority patent/KR100769073B1/en
Priority to PCT/JP2004/014334 priority patent/WO2005031126A1/en
Priority to BRPI0414943-2A priority patent/BRPI0414943A/en
Publication of JP2005105965A publication Critical patent/JP2005105965A/en
Pending legal-status Critical Current

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  • Prevention Of Electric Corrosion (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent galvanic corrosion, even if a valve seat and its installation receiving part are a combination of dissimilar metals easily causing the galvanic corrosion. <P>SOLUTION: A plating layer 14 is formed on a surface of an iron-based valve seat body 17 arranged in the installation receiving part 13 arranged in an intake port 6 of an aluminum alloy cylinder head 2. Since the plating layer 14 is interposed between the cylinder head 2 and the valve seat body 17, the galvanic corrosion can be prevented by reducing an electric potential difference in the dissimilar metals between the installation receiving part 13 and the valve seat body 17 via water. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、エンジン用バルブシート及びエンジン用シリンダヘッドに関するものである。   The present invention relates to an engine valve seat and an engine cylinder head.

従来、この種のものとして鉄基焼結合金からなるバルブシートの表面にＦｅ3Ｏ4 を主体とする酸化鉄膜を形成することにより耐摩耗性が向上し、さらに相手攻撃性を減少させることができるので、デーゼルエンジン、ＬＰＧエンジンなどのように燃焼生成物が発生しにくい高出力内燃機関の特に吸気用バルブシートとして対応することができものが公知である。 Conventionally, by forming an iron oxide film mainly composed of Fe 3 O 4 on the surface of a valve seat made of an iron-based sintered alloy as this type, the wear resistance is improved and the opponent attack is further reduced. Therefore, it is known that it can be used as an intake valve seat for a high-power internal combustion engine such as a diesel engine, an LPG engine, or the like that hardly generates combustion products.

また、１次焼結した焼結合金に溶浸処理を施した後にほぼ完成寸法まで加工した後、酸化処理してバルブシートが得られることによって、溶浸メッキ層による熱伝導性の向上と、バルブ当接面の酸化被膜による耐摩耗性の向上を得られるＬＰＧ機関や水素機関に対応できるものも公知である。   In addition, after infiltrating the sintered sintered alloy, it is processed to almost complete dimensions, and then oxidized to obtain a valve seat, thereby improving the thermal conductivity by the infiltration plating layer, Also known are LPG engines and hydrogen engines that can improve wear resistance due to an oxide film on the valve contact surface.

さらに、プレス成形され焼結された後、所定寸法に加工された焼結合金製バルブシートをシリンダヘッドに組付けた後に、水蒸気処理を施し酸化被膜を形成してなるＬＰＧ機関、水素機関或いは高鉛ガソリン機関や排気ガス再循環装置（Ｅ．Ｇ．Ｒ．）に対応できるものも公知である。
特開平７−１３３７０５公報（段落0012） 特開昭５８−７７１１４号公報（第１，３頁） 特開昭５８−７７１１６号公報（第１，２頁） Furthermore, after assembling a sintered alloy valve seat that has been press-molded and sintered and then processed into a predetermined dimension to a cylinder head, steam treatment is performed to form an oxide film, an LPG engine, a hydrogen engine, or a high-pressure engine. Also known are those that are compatible with lead gasoline engines and exhaust gas recirculation systems (EGR).
JP-A-7-133705 (paragraph 0012) JP 58-77114 A (pages 1 and 3) JP 58-77116 A (pages 1 and 2)

近年排気ガスが比較的清浄であるアルコールを主成分としたエンジン用燃料が普及している。このような燃料を空気と共に吸気口を介して燃焼室内に導入し、そして吸気口に設けた吸気用バルブシートを吸気用バルブで閉じた後に燃料を燃焼して動力を得る。その後排気口に設けた排気用バルブシートを排気用バルブで開いて排気ガスを排出する。   In recent years, engine fuels based on alcohol whose exhaust gas is relatively clean have become widespread. Such fuel is introduced into the combustion chamber together with air through the intake port, and after the intake valve seat provided at the intake port is closed by the intake valve, the fuel is burned to obtain power. Thereafter, the exhaust valve seat provided at the exhaust port is opened by the exhaust valve to exhaust the exhaust gas.

ところで、前記アルコールを主成分としたエンジン用燃料においては、従来のガソリンや軽油に比較して水分が比較的多量に含まれていることがあり、このためアルコールを主成分としたエンジン用燃料が空気と共に吸気用バルブシートを備えた吸気口を介してシリンダー内に導入する際に、吸気用バルブシートとこのバルブシートを組付けるシリンダヘッドの組付け受け部との隙間に水分が浸入するおそれがある。このようにして吸気用バルブシートとその組付け受け部との隙間に水分が介在すると、吸気用バルブシートとその組付け受け部とが異種金属、例えば吸気用バルブシートが鉄系金属、組付け受け部ひいてはシリンダヘッドがアルミニウム系金属であるような異種金属接触の場合にはガルバニ腐食が生ずるおそれがある。すなわち、前記ガルバニ腐食は異種金属が接触してその間に水分があると電気が発生して、マイナス側の金属は腐食するというものであり、アルミニウムと鉄ではアルミニウム側がマイナス側となって腐食が生ずる。この結果、例えばシリンダヘッドに組付け受け部から冷却水路に通じる孔が腐食によって形成されるようなことが懸念される。   By the way, the engine fuel mainly composed of alcohol may contain a relatively large amount of water as compared with conventional gasoline or light oil. When air is introduced into the cylinder through the intake port provided with the intake valve seat together with air, there is a risk that moisture may enter the gap between the intake valve seat and the cylinder head assembly receiving portion. is there. In this way, if moisture is present in the gap between the intake valve seat and the assembly receiving portion, the intake valve seat and the assembly receiving portion are made of different metals, for example, the intake valve seat is made of iron-based metal. Galvanic corrosion may occur in the case where the receiving portion and the cylinder head are in contact with different metals such as an aluminum metal. In other words, the galvanic corrosion means that when different metals come into contact and there is moisture between them, electricity is generated and the metal on the negative side corrodes. In aluminum and iron, the aluminum side becomes the negative side and corrosion occurs. . As a result, for example, there is a concern that a hole leading from the assembly receiving portion to the cooling water passage may be formed in the cylinder head due to corrosion.

しかしながら、前記従来技術においては耐摩耗性等を向上するためにバルブシートに酸化鉄膜等を形成したものであったが、アルコールを主成分としたエンジン用燃料を用いるエンジンに生ずるガルバニ腐食を阻止できるようなものではなかった。   However, in the prior art, an iron oxide film or the like was formed on the valve seat in order to improve wear resistance, etc., but galvanic corrosion that occurs in engines that use alcohol-based engine fuel is prevented. It wasn't something I could do.

解決しようとする問題点は、吸気用又は排気用バルブシートとその組付け受け部とがガルバニ腐食を生じやすい異種金属の組み合せであっても、ガルバニ腐食を阻止できるエンジン用バルブシート及びエンジン用シリンダヘッドを提供することを目的とする。   Problems to be solved are an engine valve seat and an engine cylinder that can prevent galvanic corrosion even if the intake or exhaust valve seat and the assembly receiving portion thereof are a combination of dissimilar metals that easily cause galvanic corrosion. The object is to provide a head.

請求項１の発明は、シリンダヘッドの吸気口又は排気口に設けた組付け受け部に設けられるバルブシート本体の表面にメッキ層を形成したことを特徴とするエンジン用バルブシートである。   The invention according to claim 1 is an engine valve seat characterized in that a plated layer is formed on a surface of a valve seat body provided in an assembly receiving portion provided in an intake port or an exhaust port of a cylinder head.

請求項２の発明は、シリンダヘッドの吸気口又は排気口に設けた組付け受け部に設けられるバルブシート本体の少なくとも前記組付け受け部に対向する表面にメッキ層を設けたことを特徴とするエンジン用バルブシートである。   The invention according to claim 2 is characterized in that a plated layer is provided on at least a surface of the valve seat body provided in an assembly receiving portion provided in an intake port or an exhaust port of a cylinder head, which faces the assembly receiving portion. This is a valve seat for an engine.

請求項３の発明は、請求項１又は２記載のエンジン用バルブシートにおいて、前記メッキ層の電極電位は、前記バルブシート本体の電極電位と前記組付け受け部の標準電極電位との間に配置されるものである。   According to a third aspect of the present invention, in the engine valve seat according to the first or second aspect, the electrode potential of the plating layer is disposed between the electrode potential of the valve seat body and the standard electrode potential of the assembly receiving portion. It is what is done.

請求項４の発明は、シリンダヘッドの吸気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の表面にメッキ層を形成したことを特徴とするシリンダヘッドである。   According to a fourth aspect of the present invention, in the cylinder head in which a valve seat is provided in an assembly receiving portion provided in an intake port of the cylinder head, a plating layer is formed on a surface of the assembly receiving portion. is there.

請求項５の発明は、シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の前記バルブシートに対向する表面にメッキ層を形成したことを特徴とするシリンダヘッドである。   According to a fifth aspect of the present invention, in the cylinder head in which the valve seat is provided in the assembly receiving portion provided in the intake port or the exhaust port of the cylinder head, a plating layer is formed on the surface of the assembly receiving portion facing the valve seat. This is a cylinder head characterized by the above.

請求項６の発明は、請求項４又は５記載のエンジン用シリンダヘッドにおいて、前記メッキ層の標準電極電位は、前記バルブシートの標準電極電位と前記組付け受け部の電極電位との間に配置されるものである。   According to a sixth aspect of the present invention, in the engine cylinder head according to the fourth or fifth aspect, the standard electrode potential of the plating layer is disposed between the standard electrode potential of the valve seat and the electrode potential of the assembly receiving portion. It is what is done.

請求項７の発明は、シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の表面と前記バルブシートの表面にそれぞれメッキ層を形成したことを特徴とするエンジン用シリンダヘッドである。   According to a seventh aspect of the present invention, in the cylinder head in which the valve seat is provided in the assembly receiving portion provided in the intake port or the exhaust port of the cylinder head, a plating layer is provided on each of the surface of the assembly receiving portion and the surface of the valve seat. An engine cylinder head characterized by being formed.

請求項８の発明は、シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の前記バルブシートに対向する表面にメッキ層を形成すると共に、前記バルブシートの前記組付け受け部に対向する表面にメッキ層を形成することを特徴とするエンジン用シリンダヘッドである。   The invention according to claim 8 is a cylinder head in which a valve seat is provided in an assembly receiving portion provided in an intake port or an exhaust port of the cylinder head, and a plating layer is formed on a surface of the assembly receiving portion facing the valve seat. In addition, the engine cylinder head is characterized in that a plating layer is formed on a surface of the valve seat facing the assembly receiving portion.

請求項９の発明は、請求項７又は８記載のエンジン用シリンダヘッドにおいて、前記組付け受け部のメッキ層の材質と前記バルブシートのメッキ層の材質は、電極電位が同じかほぼ同じ、或いはアルミニウム系の前記シリンダヘッドの電極電位、前記組付け受け部のメッキ層の電極電位、前記バルブシートのメッキ層の電極電位、鉄系の前記バルブシートの電極電位順に増加するように設けることを特徴とするものである。   The invention according to claim 9 is the cylinder head for an engine according to claim 7 or 8, wherein the material of the plating layer of the assembly receiving portion and the material of the plating layer of the valve seat have the same or substantially the same electrode potential, or The electrode potential of the aluminum-based cylinder head, the electrode potential of the plating layer of the assembly receiving portion, the electrode potential of the plating layer of the valve seat, and the electrode potential of the iron-based valve seat are increased in this order. It is what.

請求項１の発明によれば、バルブシート本体の表面に設けたメッキ層により、シリンダヘッドの組付け受け部とバルブシート本体との間にメッキ層が介在するので、水を介しての組付け受け部とバルブシート本体との電位差を減少して、ガルバニ腐食を阻止することができる。   According to the first aspect of the present invention, since the plating layer is provided between the assembly receiving part of the cylinder head and the valve seat body by the plating layer provided on the surface of the valve seat body, the assembly through water is performed. The potential difference between the receiving part and the valve seat body can be reduced to prevent galvanic corrosion.

請求項２の発明によれば、バルブシート本体の少なくとも組付け受け部に対向する表面に設けられたメッキ層により、シリンダヘッドの組付け受け部とバルブシート本体とが接触する可能性のある面にメッキ層が設けられ、組付け受け部とバルブシート本体との電位差を減少して、ガルバニ腐食を阻止することができる。   According to the invention of claim 2, the surface on which the assembly receiving portion of the cylinder head and the valve seat body may come into contact with each other by the plating layer provided on the surface facing the assembly receiving portion of the valve seat body. Is provided with a plating layer, and the potential difference between the assembly receiving portion and the valve seat body can be reduced to prevent galvanic corrosion.

請求項３の発明によれば、バルブシートに設けられたメッキ層により、メッキ層と組付け受け部間の電位差を可及的に減少することができる。   According to the invention of claim 3, the potential difference between the plating layer and the assembly receiving portion can be reduced as much as possible by the plating layer provided on the valve seat.

請求項４の発明によれば、組付け受け部の表面にメッキ層を形成したので、シリンダヘッドの組付け受け部とバルブシート本体との間にメッキ層が介在し、水を介して組付け受け部とバルブシート本体との電位差を減少して、ガルバニ腐食を阻止することができる。   According to the invention of claim 4, since the plating layer is formed on the surface of the assembly receiving portion, the plating layer is interposed between the assembly receiving portion of the cylinder head and the valve seat body, and is assembled via water. The potential difference between the receiving part and the valve seat body can be reduced to prevent galvanic corrosion.

請求項５の発明によれば、組付け受け部の前記バルブシートに対向する表面にメッキ層を形成したので、シリンダヘッドの組付け受け部とバルブシートとが接触する可能性のある面にメッキ層が設けられ、組付け受け部とバルブシートとの電位差を減少して、ガルバニ腐食を阻止することができる。   According to the invention of claim 5, since the plating layer is formed on the surface of the assembly receiving portion facing the valve seat, the surface on which the assembly receiving portion of the cylinder head and the valve seat may come into contact is plated. A layer is provided to reduce the potential difference between the assembly receiving part and the valve seat and prevent galvanic corrosion.

請求項６の発明によれば、メッキ層とバルブシート間の電位差を可及的に減少することができる。   According to the invention of claim 6, the potential difference between the plating layer and the valve seat can be reduced as much as possible.

請求項７の発明によれば、シリンダヘッドの組付け受け部とバルブシートにそれぞれメッキ層が介在し、水を介して組付け受け部とバルブシート本体との電位差を減少して、ガルバニ腐食を阻止することができる。   According to the seventh aspect of the present invention, the plating layer is interposed between the cylinder head assembly receiving portion and the valve seat, respectively, and the potential difference between the assembly receiving portion and the valve seat body is reduced through water, thereby preventing galvanic corrosion. Can be blocked.

請求項８の発明によれば、組付け受け部とバルブシートにはそれぞれ対向する表面にメッキ層を形成したので、組付け受け部とバルブシート本体との電位差を減少して、ガルバニ腐食を阻止することができる。   According to the invention of claim 8, since the plating layers are formed on the opposing surfaces of the assembly receiving portion and the valve seat, respectively, the potential difference between the assembly receiving portion and the valve seat body is reduced to prevent galvanic corrosion. can do.

請求項９の発明によれば、組付け受け部とバルブシートにそれぞれ設けられたメッキ層は、同一又は同類の材質或いはアルミニウム系の前記シリンダヘッドの電極電位、前記組付け受け部のメッキ層の電極電位、前記バルブシートのメッキ層の電極電位、鉄系の前記バルブシートの電極電位の順に増加するように設けるので、組付け受け部のメッキ層とバルブシートのメッキ層間の電位差を可及的に減少することができる。   According to invention of Claim 9, the plating layer provided in the assembly receiving part and the valve seat is the same or similar material or the electrode potential of the cylinder head made of aluminum, the plating layer of the assembly receiving part. Since the electrode potential increases in order of the electrode potential of the valve seat plating layer and the electrode potential of the iron valve seat, the potential difference between the plating layer of the assembly receiving portion and the plating layer of the valve seat is made as much as possible. Can be reduced.

本発明における好適な実施の形態について、添付図面を参照して説明する。尚、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。例えば実施例では吸気口の場合を示したが排気口の組付け受け部と排気用バルブシートでもよい。   Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. For example, in the embodiment, the case of the intake port is shown, but an assembly receiving portion of the exhaust port and an exhaust valve seat may be used.

図１〜図３は第１実施例を示しており、図示しないピストンが往復動するシリンダ１に固定するシリンダヘッド２は、アルミニウム合金製であって、その一側に吸気ポート３を設けると共に他側に排気ポート４を設けている。そして、吸気ポート３における燃焼室５に臨む吸気口６に吸気用バルブシート７を設けると共に、この吸気用バルブシート７を吸気用バルブ８が開閉するようになっている。同様に、排気ポート４における燃焼室５に臨む排気口９に排気用バルブシート10を設けると共に、この排気バルブシート10を排気用バルブ11が開閉するようになっている。さらに、シリンダヘッド２には冷却水路12が吸気ポート３と排気ポート４との間に設けられている。   1 to 3 show a first embodiment. A cylinder head 2 fixed to a cylinder 1 in which a piston (not shown) reciprocates is made of an aluminum alloy, and is provided with an intake port 3 on one side and the other. An exhaust port 4 is provided on the side. An intake valve seat 7 is provided at the intake port 6 facing the combustion chamber 5 in the intake port 3, and the intake valve seat 7 is opened and closed by the intake valve seat 7. Similarly, an exhaust valve seat 10 is provided at an exhaust port 9 facing the combustion chamber 5 in the exhaust port 4, and the exhaust valve seat 10 is opened and closed by the exhaust valve seat 10. Further, a cooling water passage 12 is provided between the intake port 3 and the exhaust port 4 in the cylinder head 2.

前記吸気口６には吸気用バルブシート７の組付け受け部13が設けられる。この組付け受け13は吸気ポート３の直径よりやや大径となるように凹段状に形成しており、この組付け受け部13に吸気用バルブシート７が嵌着している。   The intake port 6 is provided with an assembly receiving portion 13 for an intake valve seat 7. The assembly receiver 13 is formed in a concave shape so as to have a diameter slightly larger than the diameter of the intake port 3, and the intake valve seat 7 is fitted to the assembly receiver 13.

鉄系の前記吸気用バルブシート７は、外径が組付け受け部13と同径で内径が吸気ポート３と同径なリング状であって、鉄基焼結合金からなる。そして、吸気用バルブシート７における前記組付け受け部13との対向面は、メッキ層14で被覆されている。メッキ層14の標準電極電位は、後述するバルブシート本体17の電極電位と前記組付け受け部13の電極電位との間に配置される。すなわち、電極電位とは、電極と、電極をひたした溶液或いは電解質間存在する電圧であり、通常は水素電極のような標準電極と比較される。図３は金属の標準電極電圧を示している。アルミニウム合金製シリンダヘッド２の標準電極電位（ＥH）は、アルミニウムの標準電極電位（ＥH）が−１．３３７Ｖであるのでほぼ−１．３Ｖ程度であり、一方鉄系バルブシート本体17の標準電極電位は−０．４２Ｖ程度であるので、メッキ層14としては、標準電極電位が組付け受け部13とほぼ同じになるアルミニウム又はアルミニウム合金や、標準電極電位が中間に配置されるＺｎ（標準電極電位−０．７６Ｖ程度）やＣｒ（標準電極電位−０．５６Ｖ程度）、或いはＡｌ−Ｚｎ，Ｃｒ系複合メッキ、Ｚｎ系複合メッキが好ましい。尚、Ｃｒ系複合メッキは、金属メッキ膜中にＡｌ2Ｏ3等のセラミック粒子やＰＴＦＥ（４フッ化エチレン）等の樹脂粒子を分散させたメッキであり、耐食性と耐摩耗性を兼ね備えているものである。そしてその厚みは５０オングストローム〜１００μｍ、好ましくは１〜１００μｍであって、吸気用バルブシート７の外周面に設けられる外周部14ａと、吸気ポート３側に位置する当接部14ｂの他に、組付け受け部13側の角に形成した面取り角部14ｃに形成されている。尚、吸気用バルブシート７における燃焼室５に臨む面は吸気バルブ８を軸芯としたテーパ面となってシート面15に形成されており、このシート面15にはメッキ層14は形成されておらず、また内周面16にはメッキ層14を設けてもよく、或いは設けなくともよい。 The iron-based intake valve seat 7 has a ring shape whose outer diameter is the same as that of the assembly receiving portion 13 and whose inner diameter is the same as that of the intake port 3, and is made of an iron-based sintered alloy. A surface of the intake valve seat 7 facing the assembly receiving portion 13 is covered with a plating layer 14. The standard electrode potential of the plating layer 14 is arranged between an electrode potential of a valve seat body 17 described later and an electrode potential of the assembly receiving portion 13. That is, the electrode potential is a voltage existing between the electrode and the solution or electrolyte over which the electrode is applied, and is usually compared with a standard electrode such as a hydrogen electrode. FIG. 3 shows the standard electrode voltage of the metal. Standard electrode potential of the aluminum alloy cylinder head 2 (E H), because the standard electrode potential of aluminum (E H) is at -1.337V is approximately -1.3V or so, whereas the iron-based valve seat main body 17 Since the standard electrode potential is about −0.42 V, the plating layer 14 is made of aluminum or an aluminum alloy whose standard electrode potential is substantially the same as that of the assembly receiving portion 13, or Zn ( Standard electrode potential of about −0.76 V) or Cr (standard electrode potential of about −0.56 V), Al—Zn, Cr composite plating, or Zn composite plating is preferable. The Cr-based composite plating is a plating in which ceramic particles such as Al 2 O 3 and resin particles such as PTFE (tetrafluoroethylene) are dispersed in a metal plating film, and has both corrosion resistance and wear resistance. Is. The thickness thereof is 50 Å to 100 μm, preferably 1 to 100 μm. In addition to the outer peripheral portion 14 a provided on the outer peripheral surface of the intake valve seat 7 and the abutting portion 14 b located on the intake port 3 side, It is formed in a chamfered corner portion 14c formed at a corner on the attachment receiving portion 13 side. The surface of the intake valve seat 7 that faces the combustion chamber 5 is a tapered surface having the intake valve 8 as an axial center, and is formed on the seat surface 15, and a plating layer 14 is formed on the seat surface 15. Further, the plating layer 14 may or may not be provided on the inner peripheral surface 16.

次に吸気用バルブシートの製造方法及び取り付け方法について説明する。吸気用バルブシート７は、Ｆｅ粉末に、Ｆｅ−Ｓｉ粉末、Ｎｉ粉末、Ｃｏ粉末、Ｍｏ粉末、Ｆｅ−Ｗ粉末、Ｆｅ−Ｃｒ粉末、Ｃｕ粉末、Ｆｅ−Ｎｂ粉末、Ｆｅ−Ｖ粉末およびＣ粉末の全部又は一部を十分に混合し、得られた混合粉末を金型圧粉成形し、得られた金型圧粉成形体を通常の条件で焼結し、配合組成と実質的に同じ成分組成を有するバルブシート本体17を作製する。   Next, a manufacturing method and a mounting method of the intake valve seat will be described. The intake valve seat 7 is made of Fe powder, Fe-Si powder, Ni powder, Co powder, Mo powder, Fe-W powder, Fe-Cr powder, Cu powder, Fe-Nb powder, Fe-V powder and C powder. All or a part of the mixture is thoroughly mixed, the obtained mixed powder is molded into a mold, and the obtained molded powder compact is sintered under normal conditions. A valve seat body 17 having the composition is produced.

さらに、これらバルブシート本体17の外周部14ａ、当接部14ｂ、面取り角部14ｃにメッキ層14を形成する。次に吸気用バルブシート７をシリンダヘッド２に組付ける。この組付けは、組付け受け部13に吸気用バルブシート７を圧入、焼きばめ或いは冷しばめによって組付ける。次に組付けた吸気用バルブシート７のシート面15に吸気用バルブ８が密着するようにシート面15を機械加工する。   Further, a plating layer 14 is formed on the outer peripheral portion 14a, the contact portion 14b, and the chamfered corner portion 14c of the valve seat body 17. Next, the intake valve seat 7 is assembled to the cylinder head 2. In this assembly, the intake valve seat 7 is assembled into the assembly receiving portion 13 by press fitting, shrink fitting or cold fitting. Next, the seat surface 15 is machined so that the intake valve 8 is in close contact with the seat surface 15 of the assembled intake valve seat 7.

次に前記構成についてその作用を説明する。水分が比較的多量に含まれていることがありアルコールを主成分としたエンジン用燃料が空気と共に吸気ポートを通ってシリンダー１内に導入する際に、水分が吸気用バルブシート７と組付け受け部13との隙間ｓに侵入して水が溜まると、該水を介してシリンダヘッド２と吸気用バルブシート７が接触し、この結果異種金属接触が生じてガルバニ腐食が生ずるおそれがある。しかしながら、吸気バルブシート本体17における組付け受け部13側の表面には、シリンダヘッド２の材質と同一又は同類の材質かならるメッキ層14が形成されているので、ガルバニ腐食の発生を抑止することができる。   Next, the operation of the above configuration will be described. Moisture may be contained in a relatively large amount. When fuel for an engine, which is mainly composed of alcohol, is introduced into the cylinder 1 through the intake port together with air, the moisture is assembled with the intake valve seat 7. When water enters the gap s with the portion 13 and accumulates water, the cylinder head 2 and the intake valve seat 7 come into contact with each other through the water. As a result, dissimilar metal contact may occur and galvanic corrosion may occur. However, since the plating layer 14 made of the same material as or similar to the material of the cylinder head 2 is formed on the surface of the intake valve seat body 17 on the assembly receiving portion 13 side, the occurrence of galvanic corrosion is suppressed. be able to.

以上のように、前記実施例においては、アルミニウム合金製シリンダヘッド２の吸気口６に設けた組付け受け部13に設けられる鉄系バルブシート本体17の表面にメッキ層14を形成したことにより、シリンダヘッド２とバルブシート本体17との間にメッキ層14が介在するので、水を介して組付け受け部13とバルブシート本体17との異種金属の電位差を減少して、ガルバニ腐食を阻止することができる。   As described above, in the above embodiment, the plating layer 14 is formed on the surface of the iron-based valve seat body 17 provided in the assembly receiving portion 13 provided in the intake port 6 of the cylinder head 2 made of aluminum alloy. Since the plating layer 14 is interposed between the cylinder head 2 and the valve seat body 17, the potential difference of different metals between the assembly receiving portion 13 and the valve seat body 17 is reduced through water, thereby preventing galvanic corrosion. be able to.

また、メッキ層14をバルブシート本体の少なくとも前記組付け受け部13に対向する表面に設けたことにより、組付け受け部13とバルブシート本体17とが接触する可能性のある面にメッキ層14が設けられ、組付け受け部13とバルブシート本体17との異種金属の電位差を減少して、ガルバニ腐食を阻止することができる。   Further, by providing the plating layer 14 on at least the surface of the valve seat body that faces the assembly receiving portion 13, the plating layer 14 is provided on the surface where the assembly receiving portion 13 and the valve seat body 17 may come into contact with each other. Is provided, and the potential difference of different metals between the assembly receiving portion 13 and the valve seat body 17 can be reduced to prevent galvanic corrosion.

しかも、バルブシート本体17に設けられたメッキ層14の電極電位は、前記組付け受け部13の電極電位とほぼ同じか又は前記バルブシート本体17の電極電位と前記組付け受け部13の電極電位との間に配置されるものであり、メッキ層14と組付け受け部13間の電位差を可及的に減少することができる。   Moreover, the electrode potential of the plating layer 14 provided on the valve seat body 17 is substantially the same as the electrode potential of the assembly receiving portion 13, or the electrode potential of the valve seat body 17 and the electrode potential of the assembly receiving portion 13 The potential difference between the plating layer 14 and the assembly receiving portion 13 can be reduced as much as possible.

図３〜図４は第２実施例を示しており、前記第１実施例と同一部分には同一符号を付し、その詳細な説明を省略する。シリンダヘッド２に設けられる吸気口６には吸気用バルブシート21の組付け受け部22が設けられ、この組付け受け部22に吸気用バルブシート21が嵌着している。前記吸気用バルブシート21は、鉄基焼結合金からなり、外径が組付け受け部22と同径で内径が吸気ポート３と同径なリング状である。   3 to 4 show a second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The intake port 6 provided in the cylinder head 2 is provided with an assembly receiving portion 22 for the intake valve seat 21, and the intake valve seat 21 is fitted to the assembly receiving portion 22. The intake valve seat 21 is made of an iron-based sintered alloy and has a ring shape having an outer diameter the same as that of the assembly receiving portion 22 and an inner diameter the same as that of the intake port 3.

そして、組付け受け部22にメッキ層23を設ける。このメッキ層23は、吸気用バルブシート21との対向面、すなわち内周面部23ａと底面部23ｂに設けられるものである。メッキ層23の電極電位は、バルブシート21の電極電位と前記組付け受け部22の電極電位との間に配置される。すなわち、アルミニウム合金製シリンダヘッド２の標準電極電位（ＥH）は、−１．３Ｖ程度であり、一方鉄系バルブシート21の標準電極電位は−０．４２Ｖ程度であるので、メッキ層23としては、標準電極電位が中間に配置されるＺｎ（標準電極電位ー０．７６Ｖ程度）やＣｒ（標準電極電位ー０．５６Ｖ程度）、或いはＡｌ−Ｚｎ，Ｃｒ系複合メッキ、Ｚｎ系複合メッキが好ましい。 A plating layer 23 is provided on the assembly receiving portion 22. The plated layer 23 is provided on the surface facing the intake valve seat 21, that is, the inner peripheral surface portion 23a and the bottom surface portion 23b. The electrode potential of the plating layer 23 is arranged between the electrode potential of the valve seat 21 and the electrode potential of the assembly receiving portion 22. That is, the standard electrode potential (E H ) of the aluminum alloy cylinder head 2 is about −1.3V, while the standard electrode potential of the iron-based valve seat 21 is about −0.42V. Zn (standard electrode potential of about 0.76V) or Cr (standard electrode potential of about 0.56V), Al-Zn, Cr-based composite plating, or Zn-based composite plating is used. preferable.

したがって、水分が比較的多量に含まれていることがありアルコールを主成分としたエンジン用燃料が空気と共に吸気ポートを通ってシリンダー１内に導入する際に、水分が吸気用バルブシート７と組付け受け部13との隙間ｓに侵入して水が溜まると、該水を介してシリンダヘッド２と吸気用バルブシート７が接触し、この結果異種金属接触が生じてガルバニ腐食が生ずるおそれがある。しかしながら、組付け受け部22の表面には電位差を減少するメッキ層23が形成されているので、ガルバニ腐食の発生を抑止することができる。   Accordingly, when a fuel for an engine mainly composed of alcohol is introduced into the cylinder 1 through the intake port together with air, the moisture may be combined with the intake valve seat 7. When water enters the gap s between the receiving portion 13 and water is collected, the cylinder head 2 and the intake valve seat 7 come into contact with each other through the water, and as a result, dissimilar metal contact may occur and galvanic corrosion may occur. . However, since the plating layer 23 for reducing the potential difference is formed on the surface of the assembly receiving portion 22, the occurrence of galvanic corrosion can be suppressed.

以上のように、前記実施例においては、アルミニウム合金製シリンダヘッド２の吸気口６に設けた組付け受け部13にメッキ層23を設け、そしてメッキ層23を介してバルブシート21を設けたので、シリンダヘッド２とバルブシート21との間にメッキ層23が介在し、組付け受け部22とバルブシート21との異種金属の電位差を減少し、ガルバニ腐食を阻止することができる。   As described above, in the above embodiment, the plating layer 23 is provided in the assembly receiving portion 13 provided in the intake port 6 of the aluminum alloy cylinder head 2, and the valve seat 21 is provided via the plating layer 23. The plated layer 23 is interposed between the cylinder head 2 and the valve seat 21 to reduce the potential difference between different metals between the assembly receiving portion 22 and the valve seat 21 and prevent galvanic corrosion.

また、メッキ層23を組付け受け部22におけるバルブシート21に対向する表面に設けたことにより、組付け受け部22とバルブシート21とが接触する可能性のある面にメッキ層23が設けられ、組付け受け部22とバルブシート21との異種金属の電位差を減少して、ガルバニ腐食を阻止することができる。   Further, by providing the plating layer 23 on the surface of the assembly receiving portion 22 that faces the valve seat 21, the plating layer 23 is provided on the surface where the assembly receiving portion 22 and the valve seat 21 may come into contact with each other. The potential difference between dissimilar metals between the assembly receiving part 22 and the valve seat 21 can be reduced to prevent galvanic corrosion.

しかも、バルブシート21に設けられたメッキ層23の標準電極電位は、前記バルブシート21の電極電位と前記組付け受け部22の電極電位との間に配置されることにより、メッキ層23と組付け受け部22間の電位差を可及的に減少することができる。   In addition, the standard electrode potential of the plating layer 23 provided on the valve seat 21 is arranged between the electrode potential of the valve seat 21 and the electrode potential of the assembly receiving portion 22, so that The potential difference between the receiving portions 22 can be reduced as much as possible.

図７〜図８は第３実施例を示しており、前記第１実施例と同一部分には同一符号を付し、その詳細な説明を省略する。シリンダヘッド２に設けられる吸気口６には吸気用バルブシート31の組付け受け部32が設けられ、この組付け受け部32に吸気用バルブシート31が嵌着している。前記吸気用バルブシート31は、鉄基焼結合金からなり、外径が組付け受け部22と同径で内径が吸気ポート３と同径なリング状である。   7 to 8 show a third embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The intake port 6 provided in the cylinder head 2 is provided with an assembly receiving portion 32 for the intake valve seat 31, and the intake valve seat 31 is fitted to the assembly receiving portion 32. The intake valve seat 31 is made of an iron-based sintered alloy and has a ring shape whose outer diameter is the same as that of the assembly receiving portion 22 and whose inner diameter is the same as that of the intake port 3.

そして、バルブシート31における組付け受け部32との対向面と、組付け受け部32におけるバルブシート31との対向面に、それぞれメッキ層33，34を設ける。メッキ層33は吸気用バルブシート31の外周面に設けられる外周部33ａと、吸気ポート３側に位置する当接部33ｂの他に、組付け受け部32側の角に形成した面取り角部33ｃに形成されている。メッキ層34は、吸気用バルブシート31との対向面、すなわち内周面部34ａと底面部34ｂに設けられるものであって、メッキ層33，34の材質は、電極電位が同じかほぼ同じになるように同一又は同類の材質である。また、メッキ層33，34の材質は、アルミニウム合金の前記シリンダヘッド２の電極電位（−１．３３Ｖ）、前記組付け受け部34のＺｎによるメッキ層34の電極電位（−０．７６Ｖ）、前記バルブシート33のＣｒによるメッキ層33の電極電位（−０．５６Ｖ）、鉄系の前記バルブシート33の電極電位（−０．４２Ｖ）の順に増加するように設ける。   Then, plating layers 33 and 34 are provided on the surface of the valve seat 31 facing the assembly receiving portion 32 and the surface of the assembly receiving portion 32 facing the valve seat 31, respectively. The plated layer 33 has a chamfered corner portion 33c formed at a corner on the assembly receiving portion 32 side in addition to an outer peripheral portion 33a provided on the outer peripheral surface of the intake valve seat 31 and a contact portion 33b located on the intake port 3 side. Is formed. The plating layer 34 is provided on the surface facing the intake valve seat 31, that is, the inner peripheral surface portion 34a and the bottom surface portion 34b. The material of the plating layers 33 and 34 has the same or substantially the same electrode potential. The same or similar material. The material of the plating layers 33 and 34 is an electrode potential (−1.33 V) of the cylinder head 2 made of aluminum alloy, an electrode potential (−0.76 V) of the plating layer 34 due to Zn of the assembly receiving portion 34, The electrode potential (−0.56 V) of the plated layer 33 of Cr of the valve seat 33 and the electrode potential (−0.42 V) of the iron-based valve seat 33 are increased in this order.

したがって、水分が比較的多量に含まれていることがありアルコールを主成分としたエンジン用燃料が空気と共に吸気ポートを通ってシリンダー１内に導入する際に、水分が吸気用バルブシート31と組付け受け部33との隙間ｓに侵入して水が溜まると、該水を介してシリンダヘッド２と吸気用バルブシート31が接触し、この結果異種金属接触が生じてガルバニ腐食が生ずるおそれがある。しかしながら、組付け受け部32の表面には電位差を減少するメッキ層33，34が形成されているので、ガルバニ腐食の発生を抑止することができる。   Therefore, when a relatively large amount of water is contained and the engine fuel mainly composed of alcohol is introduced into the cylinder 1 through the intake port together with air, the water is combined with the intake valve seat 31. When water enters the gap s between the receiving portion 33 and water is collected, the cylinder head 2 and the intake valve seat 31 come into contact with each other through the water, and as a result, dissimilar metal contact may occur and galvanic corrosion may occur. . However, since the plating layers 33 and 34 that reduce the potential difference are formed on the surface of the assembly receiving portion 32, the occurrence of galvanic corrosion can be suppressed.

以上のように、前記実施例においては、バルブシート31と組付け受け部32にそれぞれメッキ層33，34を設けたので、シリンダヘッド２とバルブシート31との間にメッキ層33，34が介在し、組付け受け部32とバルブシート31との異種金属の電位差を減少し、ガルバニ腐食を阻止することができる。   As described above, in the above-described embodiment, since the plating layers 33 and 34 are provided on the valve seat 31 and the assembly receiving portion 32, the plating layers 33 and 34 are interposed between the cylinder head 2 and the valve seat 31. In addition, the potential difference between the dissimilar metals between the assembly receiving portion 32 and the valve seat 31 can be reduced, and galvanic corrosion can be prevented.

しかも、メッキ層33，34は、同一又は同類の材質やアルミニウム系の前記シリンダヘッドの電極電位、前記組付け受け部のメッキ層の電極電位、前記バルブシートのメッキ層の電極電位、鉄系の前記バルブシートの電極電位順に増加するように設けるので、メッキ層33，34間の電位差を可及的に減少することができる。   In addition, the plating layers 33 and 34 are made of the same or similar material or electrode potential of the cylinder head made of aluminum, electrode potential of the plating layer of the assembly receiving portion, electrode potential of the plating layer of the valve seat, Since the valve seats are provided so as to increase in order of electrode potential, the potential difference between the plated layers 33 and 34 can be reduced as much as possible.

以上のように本発明にかかるバルブシートは、水分が比較的多いエンジン用燃料などの用途にも適用できる。   As described above, the valve seat according to the present invention can be applied to uses such as engine fuel having a relatively high water content.

本発明の第１実施例を示す断面図である。It is sectional drawing which shows 1st Example of this invention. 本発明の第１実施例を示す要部の断面図である。It is sectional drawing of the principal part which shows 1st Example of this invention. 本発明の第１実施例を示す標準電極電位の説明図である。It is explanatory drawing of the standard electrode potential which shows 1st Example of this invention. 本発明の第２実施例を示す断面図である。It is sectional drawing which shows 2nd Example of this invention. 本発明の第３実施例を示す要部の断面図である。It is sectional drawing of the principal part which shows 3rd Example of this invention. 本発明の第３実施例を示す断面図である。It is sectional drawing which shows 3rd Example of this invention. 本発明の第３実施例を示す分解状態の断面図である。It is sectional drawing of the decomposition | disassembly state which shows 3rd Example of this invention.

符号の説明Explanation of symbols

２ シリンダヘッド
６ 吸気口
13 22 32組付け受け部
14 23 33 34 メッキ層
17 バルブシート本体
21 31 バルブシート 2 Cylinder head 6 Air intake
13 22 32 Assembly receiving part
14 23 33 34 Plating layer
17 Valve seat body
21 31 Valve seat

Claims (9)

シリンダヘッドの吸気口又は排気口に設けた組付け受け部に設けられるバルブシート本体の表面にメッキ層を形成したことを特徴とするエンジン用バルブシート。   A valve seat for an engine, wherein a plating layer is formed on a surface of a valve seat body provided in an assembly receiving portion provided at an intake port or an exhaust port of a cylinder head. シリンダヘッドの吸気口又は排気口に設けた組付け受け部に設けられるバルブシート本体の少なくとも前記組付け受け部に対向する表面にメッキ層を設けたことを特徴とするエンジン用バルブシート。   A valve seat for an engine, wherein a plating layer is provided on at least a surface of the valve seat main body provided in an assembly receiving portion provided in an intake port or an exhaust port of a cylinder head, which faces the assembly receiving portion. 前記メッキ層の標準電極電位は、前記バルブシート本体の電極電位と前記組付け受け部の電極電位との間に配置されることを特徴とする請求項１又は２記載のエンジン用バルブシート。   3. The valve seat for an engine according to claim 1, wherein the standard electrode potential of the plating layer is disposed between the electrode potential of the valve seat body and the electrode potential of the assembly receiving portion. シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の表面にメッキ層を形成したことを特徴とするエンジン用シリンダヘッド。   A cylinder head for an engine, wherein a valve seat is provided in an assembly receiving portion provided at an intake port or an exhaust port of the cylinder head, and a plating layer is formed on a surface of the assembly receiving portion. シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の前記バルブシートに対向する表面にメッキ層を形成したことを特徴とするエンジン用シリンダヘッド。   An engine having a valve seat provided in an assembly receiving portion provided at an intake port or an exhaust port of a cylinder head, wherein a plating layer is formed on a surface of the assembly receiving portion facing the valve seat. Cylinder head. 前記メッキ層の標準電極電位は、前記バルブシートの電極電位と前記組付け受け部の電極電位との間に配置されることを特徴とする請求項４又は５記載のエンジン用シリンダヘッド。   6. The engine cylinder head according to claim 4, wherein the standard electrode potential of the plating layer is arranged between the electrode potential of the valve seat and the electrode potential of the assembly receiving portion. シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の表面と前記バルブシートの表面にそれぞれメッキ層を形成したことを特徴とするエンジン用シリンダヘッド。   In a cylinder head in which a valve seat is provided in an assembly receiving portion provided in an intake port or an exhaust port of a cylinder head, a plating layer is formed on each of the surface of the assembly receiving portion and the surface of the valve seat. Engine cylinder head. シリンダヘッドの吸気口又は排気口に設けた組付け受け部にバルブシートを設けたシリンダヘッドにおいて、前記組付け受け部の前記バルブシートに対向する表面にメッキ層を形成すると共に、前記バルブシートの前記組付け受け部に対向する表面にメッキ層を形成することを特徴とするエンジン用シリンダヘッド。   In a cylinder head in which a valve seat is provided in an assembly receiving portion provided in an intake port or an exhaust port of a cylinder head, a plating layer is formed on a surface of the assembly receiving portion facing the valve seat, and the valve seat A cylinder head for an engine, wherein a plating layer is formed on a surface facing the assembly receiving portion. 前記組付け受け部のメッキ層の材質と前記バルブシートのメッキ層の材質は、電極電位が同じかほぼ同じ、或いはアルミニウム系の前記シリンダヘッドの電極電位、前記組付け受け部のメッキ層の電極電位、前記バルブシートのメッキ層の電極電位、鉄系の前記バルブシートの電極電位順に増加するように設けることを特徴とする請求項７又は８記載のエンジン用シリンダヘッド。   The material of the plating layer of the assembly receiving part and the material of the plating layer of the valve seat have the same or substantially the same electrode potential, or the electrode potential of the aluminum cylinder head, the electrode of the plating layer of the assembly receiving part 9. The cylinder head for an engine according to claim 7, wherein the cylinder head for an engine is provided so as to increase in the order of potential, electrode potential of the plating layer of the valve seat, and electrode potential of the iron-based valve seat.
JP2003341541A 2003-09-30 2003-09-30 Valve seat for engine and cylinder head for engine Pending JP2005105965A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2003341541A JP2005105965A (en) 2003-09-30 2003-09-30 Valve seat for engine and cylinder head for engine
CN 200480028417 CN1902381A (en) 2003-09-30 2004-09-30 Valve seat for engine and cylinder head for engine
EP04788362A EP1669558A4 (en) 2003-09-30 2004-09-30 Valve seat for engine, method of manufacturing the valve seat, and cylinder head for engine
US10/572,887 US20070101964A1 (en) 2003-09-30 2004-09-30 Valve seat for engine method of manufacturing the valve seat, and cylinder head for engine
KR1020067005967A KR100769073B1 (en) 2003-09-30 2004-09-30 Valve seat for engine, method of manufacturing the valve seat, and cylinder head for engine
PCT/JP2004/014334 WO2005031126A1 (en) 2003-09-30 2004-09-30 Valve seat for engine, method of manufacturing the valve seat, and cylinder head for engine
BRPI0414943-2A BRPI0414943A (en) 2003-09-30 2004-09-30 engine valve base, method of manufacture and engine cylinder head

Applications Claiming Priority (1)

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US20100269778A1 (en) * 2009-04-22 2010-10-28 Gm Global Technology Operations, Inc. Cylinder head assembly for an internal combustion engine and method of making the same
US8479701B2 (en) * 2009-06-15 2013-07-09 GM Global Technology Operations LLC Corrosion resistant insert for a cylinder head
US8662045B2 (en) * 2009-08-03 2014-03-04 GM Global Technology Operations LLC Cylinder head assembly for an internal combustion engine
US20190091795A1 (en) * 2017-09-11 2019-03-28 Honda Motor Co., Ltd. Welded portion forming structure and metal member joining method
WO2019221106A1 (en) 2018-05-15 2019-11-21 日本ピストンリング株式会社 Iron-based sintered alloy valve seat for internal combustion engine
DE102018218241A1 (en) * 2018-10-24 2020-04-30 Mahle International Gmbh Method for mounting a valve seat ring on a cylinder knock of an internal combustion engine

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