JPH059505B2 - - Google Patents

Info

Publication number
JPH059505B2
JPH059505B2 JP14401283A JP14401283A JPH059505B2 JP H059505 B2 JPH059505 B2 JP H059505B2 JP 14401283 A JP14401283 A JP 14401283A JP 14401283 A JP14401283 A JP 14401283A JP H059505 B2 JPH059505 B2 JP H059505B2
Authority
JP
Japan
Prior art keywords
resistance
gasoline
sliding
wear resistance
cast iron
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.)
Expired - Lifetime
Application number
JP14401283A
Other languages
Japanese (ja)
Other versions
JPS6036643A (en
Inventor
Juji Okada
Ryuichi Masuda
Tsutomu Sekiguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP14401283A priority Critical patent/JPS6036643A/en
Publication of JPS6036643A publication Critical patent/JPS6036643A/en
Publication of JPH059505B2 publication Critical patent/JPH059505B2/ja
Granted legal-status Critical Current

Links

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  • Valve-Gear Or Valve Arrangements (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明は、ロツカアーム用鋳鉄に関し、詳しく
は、無鉛ガソリンエンジン用としてのみならず、
高鉛ガソリンエンジン用としても、耐摩耗性、耐
スカツフイング性に優れ、摺動する相手材への損
傷性の少ない、ロツカアーム用鋳鉄にかかる。 エンジンの動弁機構において、カムの回転運動
を、バルブの上下運動に変換するロツカアーム
は、曲げ、引張り、あるいは、圧縮等の、複雑に
作用する応力に耐えるべく、充分に機械的性質が
必要なことはもちろんのこと、他部品(カム、バ
ルブ等)との摺動部においては、特に、耐摩耗
性、引つ掻き摩耗に耐える特性、いわゆる、耐ス
カツフイング性、ならびに、摺動する相手材への
損傷性が少ないことが必要とされている。 ところで、使用するガソリンの種類によつて、
ロツカアームの上述の摺動摩耗性能に、差異が生
じ、従来、無鉛ガソリンでは良好な摺動性能を示
したロツカアーム材料を、高鉛ガソリンで使用す
ると、著しい摩耗、スカツフイングを生じること
がある。 これは、高鉛ガソリンを使用すると、無鉛ガソ
リンの燃焼によつては、生成しないような、高鉛
ガソリン特有の燃焼生成物が、ガソリンの燃焼に
よつて生成され、これが潤滑オイル中に混入し、
ロツカアームの摺動部の摺動性能を、阻害してい
るものと考えられる。 〔発明の目的〕 本発明は、上記のような、従来のロツカアーム
材料の摺動性能に関する欠点を解決するもので、
ロツカアーム用鋳鉄の組成および組識を調整する
ことによつて、無鉛ガソリン使用時ばかりでな
く、高鉛ガソリン使用時においても、耐摩耗性、
耐スカツフイング性に優れ、摺動する相手材への
損傷性の少ない、ロツカアーム用鋳鉄を提供する
ことを目的としている。 〔発明の構成〕 このような目的は、本発明によれば、重量比率
で、C;1〜4%、Cr;1〜15%、Mo;1〜20
%、残部実質的にFeからなる組成を含有し、基
地組識を残留オーステナイト、マルテンサイト、
パーライトないしベイナイトの単独ないし混合組
識とし、その基地組識中に炭化物を分散晶出して
なることを特徴とするロツカアーム用鋳鉄によつ
て達成される。 本発明のC、Cr、Mo組成は、各々所定割合に
て添加させていることにより、基地組識中に炭化
物を分散晶出し、それによつて耐摩耗性、耐スカ
ツフイング性に優れ、摺動する相手材への損傷性
を少なくすることができる。 Cを1〜4%と限定したのは、1%以下ではロ
ツカアーム自身の耐摩耗性が劣り、4%を越える
とロツカアーム自身の性能には問題ないが、相手
攻撃性が強くなり、相手材を過度に摩耗させてし
まうためである。 Crを1〜15%と限定したのは、1%以下では
ロツカアーム自身の耐摩耗性が劣り、15%を越え
ると炭化物が脱落し易くなり、相手攻撃性だけで
なくロツカアーム自身も過度に摩耗させられてし
まうためである。 Moを1〜20%と限定したのは、Crの限定理由
と同様に、1%以下ではロツカアーム自身の耐摩
耗性が劣り、20%を越えると炭化物が脱落し易く
なり、相手攻撃性だけでなくロツカアーム自身も
過度に摩耗させられてしまうためである。 また、本発明においては、基地組織を残留オー
ステナイトとマルテンサイトとの混合組識として
いるため、耐摩耗性、耐スカツフイイング性に優
れ、摺動する相手材への損傷性の少ないものとす
ることができる。尚、ロストワツクスにて鋳造す
る場合、鋳放し状態で製造することとなるため、
一部パーライトないしベイナイトが単独ないし混
合組織として必然的に形成されている。 更に、本発明においては、基地組織中に炭化
物、即ち、C、Cr、Moを所定割合で添加してい
ることにより、例えば、高硬度のM23C6炭物を分
散晶出することとなり、耐摩耗性、耐スカツフイ
イング性に優れ、摺動する相手材への損傷性の少
ないものとすることができる。 〔実施例〕 以下、添付図面に基づいて、本発明の実施例を
説明する。 ロストワツクスにて、下表に示すような組成を
鉄中に添加し、ロツカアーム粗材を鋳造成形し
た。尚、ロツカアーム粗材を製造するための構成
元素としては、鉄中にC、Cr、Moを添加するも
のであればよい。但し、本実施例においては、鉄
元素材料として、0.1〜0.8%ぐらい必然的にSiが
混入されているスクラツプ材を用いたため、不可
避的に不純物としてSiが添加されている。 鋳造条件としては、一般的に実施されているよ
うに、ロストワツクス型に溶湯を注湯後、鋳放し
状態で凝固させ製造した。ロストワツクス型温度
は800℃、出湯温度は1500〜1700℃、鋳込温度は
1450〜1650℃である。
The present invention relates to cast iron for Rotsuka arms, and more specifically, it is not only used for unleaded gasoline engines, but also for use in unleaded gasoline engines.
Cast iron for rocker arms is also suitable for use in high-lead gasoline engines, as it has excellent wear resistance and scuffing resistance, and is less likely to damage sliding mating materials. In the engine valve mechanism, the rocker arm that converts the rotational movement of the cam into the vertical movement of the valve must have sufficient mechanical properties to withstand complex stresses such as bending, tension, and compression. Of course, in sliding parts with other parts (cams, valves, etc.), we especially need to improve wear resistance, resistance to scratching and wear, so-called scuffing resistance, as well as to the sliding mating material. There is a need for less damaging properties. By the way, depending on the type of gasoline used,
There is a difference in the above-mentioned sliding wear performance of the Rocker arm, and if the Rocker arm material that has conventionally shown good sliding performance with unleaded gasoline is used with high lead gasoline, significant wear and scuffing may occur. This is because when high-leaded gasoline is used, combustion products unique to high-leaded gasoline that are not generated when unleaded gasoline is burned are produced by combustion of gasoline, and these products are mixed into the lubricating oil. ,
It is thought that this is hindering the sliding performance of the sliding part of the rocker arm. [Object of the Invention] The present invention solves the above-mentioned drawbacks regarding the sliding performance of conventional rocker arm materials.
By adjusting the composition and structure of the cast iron for the Rotsuka arm, we have achieved wear resistance and improved resistance not only when using unleaded gasoline but also when using high lead gasoline.
The object of the present invention is to provide a cast iron for rocker arms that has excellent scuffing resistance and causes less damage to sliding mating materials. [Structure of the Invention] According to the present invention, such an objective is to achieve a weight ratio of C: 1 to 4%, Cr: 1 to 15%, Mo: 1 to 20%.
%, the balance consists essentially of Fe, and the base structure is residual austenite, martensite,
This is achieved by a cast iron for a rock arm, which is characterized by having a single or mixed structure of pearlite or bainite, and having carbide dispersed and crystallized in the matrix structure. By adding C, Cr, and Mo compositions of the present invention in predetermined proportions, carbides are dispersed and crystallized in the base structure, thereby providing excellent wear resistance and scuffing resistance, and excellent sliding properties. Damage to the mating material can be reduced. The reason for limiting C to 1 to 4% is that if it is less than 1%, the wear resistance of the Rotsuka arm itself will be poor, and if it exceeds 4%, there will be no problem with the performance of the Rotsuka arm itself, but it will become more aggressive to the opponent, and the wear resistance of the Rotsuka arm itself will be poor. This is because it causes excessive wear. The reason why Cr is limited to 1-15% is that if it is less than 1%, the wear resistance of the Rocker Arm itself will be poor, and if it exceeds 15%, the carbide will easily fall off, which will not only affect the opponent's attack but also cause excessive wear of the Rocker Arm itself. This is because they will be rejected. The reason for limiting Mo to 1 to 20% is the same as the reason for limiting Mo to Cr: if it is less than 1%, the wear resistance of the rocker arm itself will be poor, and if it exceeds 20%, the carbide will easily fall off, and it will be difficult to attack the opponent. This is because the locking arm itself is subject to excessive wear. In addition, in the present invention, since the base structure is a mixed structure of retained austenite and martensite, it has excellent wear resistance and scuffing resistance, and can cause less damage to the mating material on which it slides. can. In addition, when casting with lost wax, it is manufactured in an as-cast state, so
Part of pearlite or bainite is inevitably formed singly or as a mixed structure. Furthermore, in the present invention, by adding carbides, that is, C, Cr, and Mo in predetermined proportions to the matrix structure, for example, highly hard M 23 C 6 carbides are dispersed and crystallized, It has excellent wear resistance and scuffing resistance, and can cause less damage to the mating material on which it slides. [Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings. At Lost Wax, the composition shown in the table below was added to the iron, and the rough material of the Rotsuka arm was cast and formed. Incidentally, as the constituent elements for manufacturing the rough arm material, it is sufficient that C, Cr, and Mo are added to iron. However, in this example, since a scrap material in which about 0.1 to 0.8% of Si is inevitably mixed is used as the iron element material, Si is inevitably added as an impurity. As for the casting conditions, as is generally practiced, the molten metal was poured into a lost wax mold and then solidified in an as-cast state. The lost wax mold temperature is 800℃, the tapping temperature is 1500-1700℃, and the casting temperature is
The temperature is 1450-1650℃.

【表】【table】

〔発明の効果〕〔Effect of the invention〕

以上により明らかなように、本発明にかかるロ
ツカアーム用鋳鉄によれば、組成および鋳鉄組織
を調整することによつて、無鉛ガソリン使用時ば
かりでなく、高鉛ガソリン使用時においても、耐
摩耗性、耐スカツフイング性に優れ、摺動する相
手材への損傷性が少なく、所謂、摺動性能に優れ
ているという利点がある。
As is clear from the above, the cast iron for rocker arms according to the present invention has excellent wear resistance and resistance not only when using unleaded gasoline but also when using high lead gasoline by adjusting the composition and cast iron structure. It has the advantage of being excellent in scuffing resistance, causing little damage to the mating material it slides on, and having excellent so-called sliding performance.

【図面の簡単な説明】[Brief explanation of drawings]

図は各種試験材のモータリングによる、低速モ
ータリング試験結果を示すグラフである。
The figure is a graph showing the results of a low-speed motoring test performed by motoring various test materials.

Claims (1)

【特許請求の範囲】[Claims] 1 重量比率で、C;1〜4%、Cr;1〜15%、
Mo;1〜20%、残部実質的にFeからなる組成を
含有し、基地組識を残留オーステナイト、マルテ
ンサイト、パーライトないしベイナイトの単独な
いし混合組織とし、その基地組織中に炭化物を分
散晶出してなることを特徴とするロツカアーム用
鋳鉄。
1 Weight ratio: C: 1-4%, Cr: 1-15%,
Mo: 1 to 20%, the balance substantially consisting of Fe, the base structure is a single or mixed structure of retained austenite, martensite, pearlite or bainite, and carbides are dispersed and crystallized in the base structure. A cast iron for rock arm that is characterized by:
JP14401283A 1983-08-05 1983-08-05 Cast iron for rocker arm Granted JPS6036643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14401283A JPS6036643A (en) 1983-08-05 1983-08-05 Cast iron for rocker arm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14401283A JPS6036643A (en) 1983-08-05 1983-08-05 Cast iron for rocker arm

Publications (2)

Publication Number Publication Date
JPS6036643A JPS6036643A (en) 1985-02-25
JPH059505B2 true JPH059505B2 (en) 1993-02-05

Family

ID=15352262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14401283A Granted JPS6036643A (en) 1983-08-05 1983-08-05 Cast iron for rocker arm

Country Status (1)

Country Link
JP (1) JPS6036643A (en)

Also Published As

Publication number Publication date
JPS6036643A (en) 1985-02-25

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