JP2527548B2 - Method for manufacturing locker arm - Google Patents
Method for manufacturing locker armInfo
- Publication number
- JP2527548B2 JP2527548B2 JP61311188A JP31118886A JP2527548B2 JP 2527548 B2 JP2527548 B2 JP 2527548B2 JP 61311188 A JP61311188 A JP 61311188A JP 31118886 A JP31118886 A JP 31118886A JP 2527548 B2 JP2527548 B2 JP 2527548B2
- Authority
- JP
- Japan
- Prior art keywords
- chip
- mold
- manufacturing
- tip
- rocker arm
- 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 - Fee Related
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は内燃機関の動弁機構を構成するロッカーアー
ムの製造方法に関するものである。The present invention relates to a method for manufacturing a rocker arm that constitutes a valve mechanism of an internal combustion engine.
従来から、内燃機関のロッカーアームにおける弁棒先
端と当接し押圧する部位の表面は高周波焼入れにより高
硬度仕上げを施したものが多く用いられていた。2. Description of the Related Art Conventionally, the surface of a portion of a rocker arm of an internal combustion engine that abuts and presses against the tip of a valve rod is often subjected to a high hardness finish by induction hardening.
また、最近では第３図に示したように耐摩耗性を要す
る部位にセラミック材からなるチップを装着したものが
多く提案されている。（例えば特開昭58−2406など）。Further, recently, as shown in FIG. 3, there have been many proposals in which a chip made of a ceramic material is attached to a portion requiring wear resistance. (For example, JP-A-58-2406).
このようなセラミック製のチップは、一般にチップＣ
の一部をアーム本体Ａに鋳込むことによって装着するこ
とが行われている。Such a ceramic chip is generally a chip C
It is mounted by casting a part of the above into the arm body A.
その製造方法は第４図及び第５図に金型Ｋの要部断面
図を示すように、該金型Ｋ中の凹部Ｆにセラミック製の
チップＣを安定的に設置し、型空間Ｅ中にアルミニウム
溶湯を注入して冷却後金型Ｋ中より取出すが、この場
合、チップＣとしてきのこ型をしたものの脚C1の部分を
鋳込むことになり、傘面C2は金型Ｋ内に形成した段部K1
に係合させて正確な位置設定と、鋳造時に移動するもの
を防止することが行われている。As shown in FIGS. 4 and 5 which are sectional views of the main part of the mold K, the manufacturing method is such that a ceramic chip C is stably installed in a recess F of the mold K, and the mold space E The molten aluminum is poured into and is taken out from the mold K after cooling, but in this case, the leg C 1 of the mushroom type chip C is cast, and the umbrella surface C 2 is inside the mold K. Formed step K 1
The precise position setting and the prevention of the movement during casting are performed.
ところが、上記の如き、鋳造をする場合のアルミニウ
ム溶湯温度は700℃であり鋳造完了後室温まで冷却する
際、収縮により過大な応力が発生する。この結果、チッ
プＣにクラックが入り易く、製造上の歩留りが悪いばか
りでなく、またクラックが発生してない場合であっても
残留応力によって不安定なものとなるため内燃機関の作
動中チップＣが破損するとなると重大結果を招来する恐
れが大きかった。However, as described above, the temperature of the molten aluminum in the case of casting is 700 ° C., and when cooled to room temperature after completion of casting, excessive stress is generated due to shrinkage. As a result, the chips C are likely to be cracked, the manufacturing yield is not good, and even if no cracks are generated, the chips become unstable due to residual stress. There was a great risk of serious consequences if the item was damaged.
上記事情に鑑みて、鋳造完了後の溶湯冷却に伴う応力
がチップに作用するのを停止させるべく、きのこ型をし
たチップを金型中にセットするに際し、該金型中のアー
ム本体の先端側に設けた金型内壁面の段部が、前記チッ
プの傘面から0.3〜3.0mmの間隙を保持した状態で鋳造を
行うことを特徴とする。In view of the above circumstances, when setting a mushroom-shaped chip in a mold, in order to stop the stress caused by cooling the molten metal after the casting is completed from acting on the chip, the tip side of the arm body in the mold It is characterized in that casting is carried out in a state in which the stepped portion of the inner wall surface of the die provided in (3) holds a gap of 0.3 to 3.0 mm from the umbrella surface of the chip.
以下、図によって本発明を具体的に説明する。 Hereinafter, the present invention will be specifically described with reference to the drawings.
（従来例と同一部分は同一符号を用いる。） 第１図には、本発明製造方法によって製造したロッカ
ーアームＬを示し、チップＣの先端とアーム本体Ａの先
端ａとは、ほぼ同一先端面を形成している。(The same reference numerals are used for the same parts as in the conventional example.) FIG. 1 shows a rocker arm L manufactured by the manufacturing method of the present invention, and the tip of the chip C and the tip a of the arm body A are substantially the same tip surface. Is formed.
このようなロッカーアームの製造方法としては、第２
図にて鋳造金型の要部断面を示すように金型Ｋ内の所定
位置にセラミックス製のチップＣを設置し、型空間Ｅ中
にアルミニウム溶湯を注入するが、チップＣを金型Ｋ内
に設置する場合、該金型Ｋの内壁には段部K1を有すると
ともに該段部K1とチップＣの傘面C2との間に間隙Ｓを形
成する如く、上記段部K1は傘面C2に当接することなく若
干離れた位置に形成する。この間隙Ｓとしては小さすぎ
てもあるいは大きすぎても不都合で種々の実験を繰り返
し、製作したローカーアームの特性、残留応力を測定し
た結果、間隙Ｓ＝0.3〜3.0mmが最適値でこの間隙Ｓがア
ーム本体Ａの先端ａの肉厚にほぼ相当する。（熱収縮分
だけ薄くなる） このような間隙Ｓが形成してあることによって、この
空間中にも溶湯が注入され、この部分が小さい体積で冷
却が速いことからホーム本体Ａを成す体積の大きい部位
に比べ速く固化することから、機械強度が大きく、かつ
金型Ｋの段部K1によって係止された状態となる結果、特
に体積の大きい部位が冷却する場合に発生する応力はア
ーム本体Ａの先端部には作用することなく、解消され、
チップＣの脚C1には、ほとんど応力が作用せず、しかも
応力が残留することがない。The second method for manufacturing such a rocker arm is
A ceramic chip C is installed at a predetermined position in the mold K as shown in the cross section of the main part of the casting mold in the figure, and the molten aluminum is injected into the mold space E. when installed in, as to form a gap S between the umbrella surface C 2 of the step portion K 1 and the chip C with the inner wall of the mold K having a stepped portion K 1, the stepped portion K 1 is It is formed at a position slightly apart without coming into contact with the umbrella surface C 2 . It is inconvenient if the gap S is too small or too large, and various experiments are repeated to measure the characteristics and residual stress of the manufactured loker arm. As a result, the gap S = 0.3 to 3.0 mm is the optimum value. Substantially corresponds to the thickness of the tip a of the arm body A. (Thinning is reduced by the amount of heat shrinkage) By forming such a gap S, the molten metal is also injected into this space, and since this portion has a small volume and quick cooling, the home body A has a large volume. Since it solidifies faster than the part, it has a large mechanical strength and is locked by the stepped part K 1 of the mold K. As a result, the stress generated when the part having a particularly large volume is cooled is the arm body A. It is resolved without acting on the tip of
Almost no stress acts on the leg C 1 of the chip C, and no stress remains.
なお、第２図の如く、チップＣを金型Ｋ内に装填した
状態において、チップＣの曲面が金型Ｋの凹部Ｆの内壁
形状と合致していることから溶湯を注入した際、動揺し
たり移動して位置、角度が変化することはなかった。As shown in FIG. 2, when the chip C is loaded in the mold K, the curved surface of the chip C matches the shape of the inner wall of the recess F of the mold K. The position and angle did not change due to the movement.
叙上のように、本発明はチップの傘面と金型内壁に設
けた段部との間に間隙を形成した状態にて鋳造してロッ
カーアームを製造することから鋳造冷却時における応力
がチップに作用することがない。その結果、収縮応力に
よるチップの割れ、破損が解消することから生産歩留も
よく、かつ残留応力もないため使用時にクラックの発生
や破損が生じる恐れもなく信頼上が向上するなど多くの
作用効果がある。As described above, according to the present invention, since the rocker arm is manufactured by casting with a gap formed between the umbrella surface of the chip and the stepped portion provided on the inner wall of the mold, the stress during cooling the casting is Has no effect on. As a result, chip yields due to shrinkage stress are eliminated, resulting in good production yield, and since there is no residual stress, there is no risk of cracks or damage occurring during use, and reliability is improved. There is.
第１図は本発明に係るロッカーアームの製造方法により
製作したロッカーアームの一部破断面図、第２図は本発
明実施例によるロッカーアームの製造方法を説明するた
めの鋳造金型の要部断面図、第３図は従来の製造方法に
より製作したロッカーアームの一部破断面図、第４図は
従来のロッカーアームの製造方法を説明するための鋳造
金型の要部断面図、第５図は第４図におけるＸ−Ｘ線断
面図である。 A:アーム本体、C:チップ K:金型、S:間隙FIG. 1 is a partial cross-sectional view of a rocker arm manufactured by a rocker arm manufacturing method according to the present invention, and FIG. 2 is a main part of a casting mold for explaining a rocker arm manufacturing method according to an embodiment of the present invention. Sectional view, FIG. 3 is a partially broken sectional view of a rocker arm manufactured by a conventional manufacturing method, and FIG. 4 is a sectional view of a main part of a casting mold for explaining a conventional rocker arm manufacturing method. The drawing is a sectional view taken along line XX in FIG. A: Arm body, C: Tip K: Mold, S: Gap
Claims (1)
ミックス、サーメット、超硬などの耐摩耗性を有する材
料から成るきのこ型のチップを金型中にセットし、該チ
ップの先端とほぼ同一先端面を形成するアーム本体の先
端側に設けた金型内壁面の段部が、前記チップの傘面か
ら0.3〜3.0mmの間隙を保持した状態で溶湯を注入するこ
とを特徴とするロッカーアームの製造方法。1. A mushroom-shaped chip made of a material having wear resistance such as ceramics such as silicon carbide, silicon nitride, zirconia, cermet, cemented carbide, etc. is set in a mold, and its tip is substantially the same as the tip of the chip. The stepped portion of the inner wall surface of the mold provided on the tip side of the arm body that forms the surface of the rocker arm is characterized by injecting the molten metal while maintaining a gap of 0.3 to 3.0 mm from the umbrella surface of the chip. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61311188A JP2527548B2 (en) | 1986-12-27 | 1986-12-27 | Method for manufacturing locker arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61311188A JP2527548B2 (en) | 1986-12-27 | 1986-12-27 | Method for manufacturing locker arm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63168269A JPS63168269A (en) | 1988-07-12 |
| JP2527548B2 true JP2527548B2 (en) | 1996-08-28 |
Family
ID=18014152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61311188A Expired - Fee Related JP2527548B2 (en) | 1986-12-27 | 1986-12-27 | Method for manufacturing locker arm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2527548B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5634013U (en) * | 1979-08-24 | 1981-04-03 |
-
1986
- 1986-12-27 JP JP61311188A patent/JP2527548B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63168269A (en) | 1988-07-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |