JPH07133705A - Valve seat - Google Patents
Valve seatInfo
- Publication number
- JPH07133705A JPH07133705A JP30474393A JP30474393A JPH07133705A JP H07133705 A JPH07133705 A JP H07133705A JP 30474393 A JP30474393 A JP 30474393A JP 30474393 A JP30474393 A JP 30474393A JP H07133705 A JPH07133705 A JP H07133705A
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- iron
- base
- oxide film
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、特にデーゼルエンジ
ン、ＬＰＧエンジンなどの吸気用バルブシートとして使
用される耐摩耗性に優れた鉄基焼結合金を基体としたバ
ルブシートに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat based on an iron-based sintered alloy having excellent wear resistance, which is used as an intake valve seat for a diesel engine, an LPG engine and the like.
【０００２】[0002]
【従来の技術】従来、自動車をはじめ、各種の内燃機関
のバルブシートの製造に多くの鉄基焼結合金が用いられ
ていることは良く知られているところである。2. Description of the Related Art It is well known that many iron-based sintered alloys have been conventionally used for manufacturing valve seats of various internal combustion engines including automobiles.
【０００３】[0003]
【発明が解決しようとする課題】しかし、近年、各種の
内燃機関の高性能化および高速化はめざましく、これに
伴ってバルブがバルブシートを連打する回数が従来より
も格段に増加し、しかも、従来の鉄基焼結合金からなる
バルブシートを、デーゼルエンジン、ＬＰＧエンジンな
どの吸気用バルブシートとして使用すると、デーゼルエ
ンジン、ＬＰＧエンジンは燃焼生成物が発生しにくいた
め、バルブとバルブシートが金属接触を行うことにな
り、過大な摩耗が生じる、などの課題があった。However, in recent years, the performance and speed of various internal combustion engines have been remarkably high, and along with this, the number of times the valve repeatedly strikes the valve seat has increased remarkably, and furthermore, If a valve seat made of a conventional iron-based sintered alloy is used as an intake valve seat for a diesel engine or LPG engine, combustion products are less likely to be generated in the diesel engine or LPG engine. Therefore, there is a problem that excessive wear occurs.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者らは、
上述のような観点から、デーゼルエンジン、ＬＰＧエン
ジンなどの吸気用バルブシートとして使用することので
きる鉄基焼結合金からなるバルブシートを得るべく研究
を行った結果、鉄基焼結合金からなるバルブシートの表
面をＦｅ3 Ｏ4 を主体とする酸化鉄膜で被覆すると、こ
れを吸気用バルブシートとして使用しても、バルブがバ
ルブシートを連打する時にＦｅ3 Ｏ4 を主体とする酸化
鉄膜がバルブとバルブシートの間に介在して固体潤滑剤
として作用し、金属接触を避けることができるので耐摩
耗性が向上し、デーゼルエンジン、ＬＰＧエンジンの吸
気用バルブおよび吸気用バルブシートの寿命を大幅に向
上させるという知見を得たのである。Therefore, the present inventors have
From the above viewpoints, as a result of research to obtain a valve seat made of an iron-based sintered alloy that can be used as an intake valve seat for a diesel engine, an LPG engine, etc., a valve made of an iron-based sintered alloy is obtained. when the surface of the sheet coated with an iron oxide film mainly made of Fe 3 O 4, also be used as the intake valve seat, the iron oxide film mainly made of Fe 3 O 4 when the valve is pummeled valve seat Acts as a solid lubricant intervening between the valve and the valve seat, avoiding metal contact, improving wear resistance and extending the life of the intake valve and intake valve seat of the diesel engine and LPG engine. We have obtained the knowledge that it will be greatly improved.
【０００５】この発明は、かかる知見にもとづいてなさ
れたものであって、鉄基焼結合金を基体とし、その表面
をＦｅ3 Ｏ4 を主体とする酸化鉄膜で被覆しているバル
ブシートに特徴を有するものである。The present invention has been made on the basis of the above findings, and provides a valve seat in which an iron-based sintered alloy is used as a substrate and the surface thereof is covered with an iron oxide film mainly composed of Fe 3 O 4. It has characteristics.
【０００６】前記酸化鉄膜の厚さは、１〜１０μｍの範
囲内にあることが好ましく、その理由は、１μｍ未満で
は固体潤滑剤として十分に作用せず、一方、１０μｍを
越えてもより一層の効果が得られないからである。The thickness of the iron oxide film is preferably in the range of 1 to 10 μm, because the thickness of less than 1 μm does not sufficiently act as a solid lubricant, while the thickness of more than 10 μm is more effective. This is because the effect of is not obtained.
【０００７】[0007]
【実施例】原料粉末として、いずれも１００μｍ以下の
平均粒径を有するＦｅ粉末、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
粉末をそれぞれ用意し、これら原料粉末を表１〜表２に
示される配合組成になるように配合し、十分に混合し、
得られた混合粉末を６ｔｏｎ／ｃｍ2 の圧力で外径：３
４ｍｍ×内径：２８ｍｍ×厚さ：８ｍｍの寸法を有する
形状に金型圧粉成形し、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
する従来バルブシート１〜１０を作製し、さらに、これ
ら従来バルブシート１〜１０を４５０〜５５０℃の範囲
内の所定の温度で水蒸気処理することにより従来バルブ
シート１〜１０の表面にＦｅ3 Ｏ4 を主体とする酸化鉄
膜を形成し、本発明バルブシート１〜１０を作製した。Examples As raw material powders, Fe powders, Fe-Si powders, Ni powders, Co powders, Mo powders, Fe-W powders, Fe-Cr powders, Cu powders, Fe- having an average particle diameter of 100 μm or less are all used. Nb powder, Fe-V powder and C
Powders are prepared respectively, these raw material powders are blended so as to have a blending composition shown in Table 1 and Table 2, and they are sufficiently mixed,
Outside diameter: 3 at a pressure of 6 ton / cm 2 of the obtained mixed powder
4 mm × inner diameter: 28 mm × thickness: 8 mm in the shape of a mold, which is compacted, and the resulting compacted compact of the mold is sintered under normal conditions to obtain substantially the same composition as the compounded composition. Fe 3 is produced on the surface of the conventional valve seats 1 to 10 by steaming these conventional valve seats 1 to 10 at a predetermined temperature within the range of 450 to 550 ° C. An iron oxide film containing O 4 as a main component was formed to prepare valve sheets 1 to 10 of the present invention.
【０００８】前記本発明バルブシート１〜１０に形成し
た酸化鉄膜の厚さを測定し、その測定値を表１に示し、
ついで、これら本発明バルブシート１〜１０および従来
バルブシート１〜１０を電気炉を有する摩耗試験機の支
持台上にセットし、プロパンガスと空気の混合ガス雰囲
気中で２５０℃に加熱し、ＪＩＳ ＳＵＨ−１１からな
る材質のバルブを、表面加熱温度を２３０℃に保持し前
記支持台上にセットした本発明バルブシート１〜１０お
よび従来バルブシート１〜１０に着座回数：３０００回
／ｍｉｎで着座させ、各バルブシートの最大摩耗深さを
測定し、これらの測定結果を表１〜表２に示した。The thickness of the iron oxide film formed on the valve seats 1 to 10 of the present invention was measured, and the measured values are shown in Table 1.
Then, these valve seats 1 to 10 of the present invention and conventional valve seats 1 to 10 are set on a support stand of an abrasion tester having an electric furnace, and heated to 250 ° C. in a mixed gas atmosphere of propane gas and air, and JIS A valve made of a material of SUH-11 was seated on the valve seats 1 to 10 of the present invention and conventional valve seats 1 to 10 in which the surface heating temperature was maintained at 230 ° C. and set on the support base at a seating frequency of 3000 times / min. Then, the maximum wear depth of each valve seat was measured, and the measurement results are shown in Tables 1 and 2.
【０００９】[0009]
【表１】 [Table 1]
【００１０】[0010]
【表２】 [Table 2]
【００１１】[0011]
【発明の効果】表１〜表２に示した結果から、本発明バ
ルブシート１と従来バルブシート１を比較すると、バル
ブシート基体の材質は同じであるが、表面にＦｅ3 Ｏ4
を主体とする酸化鉄膜を形成した本発明バルブシート１
は、酸化鉄膜のない従来バルブシート１に比べて、一段
と優れた耐摩耗性を有し、さらに相手部材であるバルブ
の摩耗も少ないことが分かる。同様にして、本発明バル
ブシート２〜１０と従来バルブシート２〜１０をそれぞ
れ比較しても同じ結果が得られることが分かる。From the results shown in Tables 1 and 2, when comparing the valve seat 1 of the present invention and the conventional valve seat 1, the material of the valve seat base is the same, but Fe 3 O 4 is formed on the surface.
The valve seat 1 of the present invention having an iron oxide film mainly composed of
In comparison with the conventional valve seat 1 having no iron oxide film, is more excellent in wear resistance, and the valve which is the other member wears less. Similarly, it is understood that the same results can be obtained by comparing the valve seats 2 to 10 of the present invention with the conventional valve seats 2 to 10, respectively.
【００１２】上述のように、この発明の鉄基焼結合金か
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従来よりも耐摩耗性が向上
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
シートとして十分に対応することができ、実用に際して
は、優れた性能を長期にわたって発揮することにより工
業上優れた効果をもたらすものである。As described above, by forming the iron oxide film mainly composed of Fe 3 O 4 on the surface of the valve seat made of the iron-based sintered alloy of the present invention, the wear resistance is improved as compared with the conventional one, and Since it can reduce the opponent's aggression,
It can be sufficiently used as a valve seat for high-power internal combustion engines, such as diesel engines and LPG engines, in which combustion products are less likely to be generated, and in practical use, by exhibiting excellent performance over a long period of time. It brings excellent effects.
Claims (1)
ｅ3 Ｏ4 を主体とする酸化鉄膜で被覆されていることを
特徴とするバルブシート。1. An iron-based sintered alloy as a substrate, the surface of which is F
A valve seat characterized by being coated with an iron oxide film mainly composed of e 3 O 4 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30474393A JPH07133705A (en) | 1993-11-10 | 1993-11-10 | Valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30474393A JPH07133705A (en) | 1993-11-10 | 1993-11-10 | Valve seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07133705A true JPH07133705A (en) | 1995-05-23 |
Family
ID=17936687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30474393A Pending JPH07133705A (en) | 1993-11-10 | 1993-11-10 | Valve seat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07133705A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031126A1 (en) * | 2003-09-30 | 2005-04-07 | Mitsubishi Materials Pmg Corporation | Valve seat for engine, method of manufacturing the valve seat, and cylinder head for engine |
| WO2013080591A1 (en) | 2011-11-29 | 2013-06-06 | Ｔｐｒ株式会社 | Valve seat |
| WO2015033415A1 (en) * | 2013-09-05 | 2015-03-12 | Ｔｐｒ株式会社 | Valve seat |
| JP2018178143A (en) * | 2017-04-04 | 2018-11-15 | トヨタ自動車株式会社 | Manufacturing method of abrasion resistant iron-based sintered alloy |
-
1993
- 1993-11-10 JP JP30474393A patent/JPH07133705A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031126A1 (en) * | 2003-09-30 | 2005-04-07 | Mitsubishi Materials Pmg Corporation | Valve seat for engine, method of manufacturing the valve seat, and cylinder head for engine |
| KR100769073B1 (en) * | 2003-09-30 | 2007-10-22 | 미쓰비시 마테리알 피엠지 가부시키가이샤 | Valve seat for engine, method of manufacturing the valve seat, and cylinder head for engine |
| WO2013080591A1 (en) | 2011-11-29 | 2013-06-06 | Ｔｐｒ株式会社 | Valve seat |
| JP2013113220A (en) * | 2011-11-29 | 2013-06-10 | Tpr Co Ltd | Valve seat |
| CN104024585A (en) * | 2011-11-29 | 2014-09-03 | 帝伯爱尔株式会社 | Valve seat |
| US9581056B2 (en) | 2011-11-29 | 2017-02-28 | Tpr Co., Ltd. | Valve seat |
| WO2015033415A1 (en) * | 2013-09-05 | 2015-03-12 | Ｔｐｒ株式会社 | Valve seat |
| JP5856359B2 (en) * | 2013-09-05 | 2016-02-09 | Ｔｐｒ株式会社 | Manufacturing method of valve seat |
| US9556761B2 (en) | 2013-09-05 | 2017-01-31 | Tpr Co., Ltd. | Valve seat |
| US10036287B2 (en) | 2013-09-05 | 2018-07-31 | Tpr Co., Ltd. | Valve seat |
| JP2018178143A (en) * | 2017-04-04 | 2018-11-15 | トヨタ自動車株式会社 | Manufacturing method of abrasion resistant iron-based sintered alloy |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20010306 |