JPS61288002A - Production of cam shaft - Google Patents
Production of cam shaftInfo
- Publication number
- JPS61288002A JPS61288002A JP12993985A JP12993985A JPS61288002A JP S61288002 A JPS61288002 A JP S61288002A JP 12993985 A JP12993985 A JP 12993985A JP 12993985 A JP12993985 A JP 12993985A JP S61288002 A JPS61288002 A JP S61288002A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- sintered
- steel
- cam lobes
- camrozo
- 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.)
- Granted
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Powder Metallurgy (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、予め浸炭処理を施こした鋼製シャフトを用い
て該シャフトと焼結カムロブとの結合(以下、焼着と称
する)を強固にし、且つシャフトを切削加工によってジ
ャーナルとして使用する場合Kuシャフトに形成され念
ジャーナル部の耐摩耗性向上を図るようにしたカムシャ
フトの製造方法に関するものでるる。Detailed Description of the Invention (Field of Industrial Application) The present invention uses a steel shaft that has been carburized in advance to strengthen the connection between the shaft and a sintered cam lobe (hereinafter referred to as sintering). The present invention relates to a method for manufacturing a camshaft in which the shaft is formed into a Ku shaft to improve the wear resistance of the journal portion when the shaft is used as a journal by cutting.
(従来の技術)
近年、内燃機関においては、省エネルギーの観点から軽
量化が要求される一方では、高速化と、高出力化が要請
されている。それに伴ない、カムシャフトにおいても、
軽量で、且つ強度、耐摩耗性に優れ、更に生産性にも優
れたカムシャフトが要求されているのが現状でめる。(Prior Art) In recent years, internal combustion engines are required to be lighter in weight from the viewpoint of energy conservation, and at the same time, higher speed and higher output are also required. Along with this, the camshaft also
Currently, there is a demand for camshafts that are lightweight, have excellent strength and wear resistance, and are also highly productive.
従来のカムシャフトは、比較的低負荷のモノマは鍛造カ
ムシャフトも使用されてい九が、内燃機関の性能向上に
より、一般に耐摩耗性の優れた焼入れまたはチルド化さ
れた鋳鉄カムシャフトが使用されている。Conventional camshafts are relatively low-load monomer forged camshafts. However, as the performance of internal combustion engines improves, hardened or chilled cast iron camshafts, which have better wear resistance, are generally used. There is.
ところが、鋳鉄カムシャフトは一般的に:imtが重く
、且つ強度的にも特別優れ友ものではなく、さらには、
大型カムシャフト′を鋳造する場合1曲りや鋳造欠陥が
生じ易く、その上、チルド層、焼入の管理に特別の技術
を要する等、製造上技術的に困難な場合が多い。However, cast iron camshafts are generally heavy and not particularly strong, and furthermore,
When casting a large camshaft, bends and casting defects are likely to occur, and in addition, special techniques are required to control the chilled layer and quenching, which is often technically difficult to manufacture.
これに対して1強度と軽量化を向上させる次めに、カム
ロゾ等の摺動部を焼結合金とし、ステムを鋼管で形成し
た。即ち各部材を異種材料で形成したカムシャフトが知
られている。例えば、カムロゾをステムに組付は次状態
のまま焼結を行ってステムとカムロゾを焼着する場合、
−ケ所でも焼着不良がるるとカムシャフト全体が使用不
能となる。また、焼結合金は通常の溶接で鋼製ステふと
結合しようとしても溶接性が悪い。また、ろう付けする
場合、適当なろう剤がなく、ろう付けによる結合にも不
安かめる。In order to improve strength and weight, the sliding parts of the camrozo etc. were made of sintered alloy, and the stem was made of steel pipe. That is, camshafts in which each member is made of different materials are known. For example, when assembling the camrozo to the stem, sinter the stem and camrozo in the following state,
- If the camshaft is defective in any of these places, the entire camshaft will become unusable. Furthermore, even if a sintered alloy is attempted to be joined to a steel stem by normal welding, weldability is poor. Furthermore, when brazing, there is no suitable brazing agent, and there are concerns about joining by brazing.
また、シャフトを削り出してジャーナル部として用いる
場合、従来シャフト材としては耐摩耗性を考慮して高炭
素鋼か合金鋼を使用していた。しかし、これらの材料は
材料費が高くまたシャフトの製造が困難であるばかりで
なく加工性も悪く。Furthermore, when cutting out a shaft and using it as a journal part, high carbon steel or alloy steel has conventionally been used as the shaft material in consideration of wear resistance. However, these materials not only have high material costs and are difficult to manufacture into shafts, but also have poor workability.
コスト高になっていた。The cost was getting high.
(問題点を解決するための手段)
本発明は、上記の課題を解消する念めに、鋼製シャフト
に浸炭処理を施こした後、焼結カムロゾを組み付けて加
熱炉中で焼結し、シャフトと焼結カムロブとを金属学的
接合により強固に焼着させることにより焼着率を向上さ
せるば示りでなく、シャフトを切削加工によってジャー
ナルとして使用する場合にはジャーナル部の耐摩耗性の
向上を図ったカムシャフトの製造方法を提供することを
目的とするものである。(Means for Solving the Problems) In order to solve the above problems, the present invention carburizes a steel shaft, then assembles a sintered camrozo and sinters it in a heating furnace. It is not only possible to improve the seizing rate by strongly baking the shaft and sintered cam lobe through metallurgical bonding, but also to improve the wear resistance of the journal when the shaft is used as a journal by cutting. It is an object of the present invention to provide an improved method of manufacturing a camshaft.
上記目的を達成するために1本発明は、鋼製シャフトに
焼結カムロゾを焼着させてなる粉末合金製カムシャフト
の製造にオ几り、予め切削加工してジャーナル部を形成
した鋼製シャフトに浸炭処理tmこした後、該シャフト
に焼結カムロゾを組み付けて加熱炉中で焼結することに
より、シャフトと焼結カムロゾとの接合部を金属学的接
合により強固に焼着し、且つシャフトを切削加工によっ
てジャーナルとして使用する場合にはジャーナル部の耐
摩耗性の向上をも図ることを特徴とするものでるる。In order to achieve the above object, the present invention has been developed to manufacture a powder alloy camshaft in which a sintered camrozo is baked onto a steel shaft, and a steel shaft having a journal portion formed by cutting in advance. After carburizing (tm), the shaft is assembled with a sintered camrozo and sintered in a heating furnace, so that the joint between the shaft and the sintered camrozo is firmly sintered by metallurgical bonding, and the shaft is When used as a journal by cutting, it is characterized by improving the wear resistance of the journal portion.
(実施例)
以下、図面を参照して本発明の製造方法の実施例を具体
的に説明する。(Example) Hereinafter, an example of the manufacturing method of the present invention will be specifically described with reference to the drawings.
図に示すように、鋼製シャフト1には予め切削加工によ
り形成されたジャーナル部2が設けられている。本発明
に使用するシャフト1の鋼種は特に限定されないが、強
度上で許容される限り、なるべく安価で且つ加工性が良
好でるる炭素含有量の比較的低い炭素鋼るるいは合金鋼
が好適でるる。As shown in the figure, a steel shaft 1 is provided with a journal portion 2 formed in advance by cutting. The steel type of the shaft 1 used in the present invention is not particularly limited, but carbon steel or alloy steel with a relatively low carbon content, which is as cheap as possible and has good workability, is preferably used as long as it is allowed in terms of strength. Ruru.
ジャーナル部2をシャフト1上に形成するには、予め切
削により荒加工し、然る後、浸炭処理を施こす。これに
より、焼結後は研摩加工のみを行うだけで耐摩耗性の優
れた低コストのジャーナル部2が出来上る。尚、削り代
が少ないシャフトの場合にはそのままジャーナル部とし
て使用する。In order to form the journal portion 2 on the shaft 1, it is first rough-machined by cutting, and then carburized. As a result, a low-cost journal portion 2 with excellent wear resistance can be completed by simply performing polishing after sintering. In addition, if the shaft has a small machining allowance, it can be used as it is as a journal part.
6は焼結カムロゾでるり、鋼製シャフト1に浸炭処理が
施こされ表面及びその近傍に浸炭層11が形成された後
、シャフト1に組み付けられる。The steel shaft 1 is carburized using a sintered camrod 6 to form a carburized layer 11 on the surface and its vicinity, and is then assembled to the shaft 1.
焼結カムロゾ6と浸炭処理し九シャフトとの焼着は加熱
した炉中で行なわれる6まず、焼結カムロゾ6を組み付
けたシャツ)1ft加熱炉中に挿入すると、炭素含有量
の高い焼結カムロゾ3から炭素含有量の低いシャフト1
に拡散が始まる。やがて焼結カムロゾ3とシャフト1と
の接合部の炭素濃度が上がると、炉内は高温のため該接
合部は一部液相を生じて合金層を形成し、焼結カムロゾ
3とシャフト1とは強固な金属学的接合により焼着され
る。従って1本発明のように、予め、シャフト10表層
に一定厚さの浸炭処理を施こし浸炭層11を形成してお
くことにより焼着は早く進行し、より強固で安定した焼
着が得られるのでるる。The sintering of the sintered camrozo 6 and the carburized shaft is carried out in a heated furnace. 6) First, when the sintered camrozo 6 is inserted into a 1ft heating furnace, the sintered camrozo 6 with a high carbon content is inserted into the 1ft heating furnace. 3 to shaft 1 with low carbon content
The spread begins. Eventually, as the carbon concentration at the joint between the sintered camrozo 3 and the shaft 1 rises, a liquid phase is partially generated at the joint due to the high temperature inside the furnace, forming an alloy layer, and the sintered camrozo 3 and the shaft 1 are bonded together. is baked with a strong metallurgical bond. Therefore, as in the present invention, by performing carburizing treatment to a certain thickness on the surface layer of the shaft 10 in advance to form the carburized layer 11, the burning progresses quickly and stronger and more stable burning can be obtained. Node Ruru.
本発明においては、浸炭処理の程度を鋼種またはその使
用目的によって調節させることは言うまでもないことで
るる。また浸炭処理の方法は特に限定するものではない
。In the present invention, it goes without saying that the degree of carburizing treatment can be adjusted depending on the type of steel or its intended use. Moreover, the method of carburizing treatment is not particularly limited.
上記実施例においては、シャフトを切削加工してジャー
ナルとして使用した例を基にして説明し九が、ジャーナ
ルも焼結部品を組み付けした形式%式%
以上述べたように5本発明は、シャフトに予め浸炭処理
を施こしたので、該シャフトと焼結カムロゾとの焼着が
加熱炉中で早く進行し、しかも該焼着は金属学的接合で
るるため、シャフトと焼結カムロゾとの焼着はよシ強固
となる。In the above embodiment, the description is based on an example in which the shaft is machined and used as a journal. Since the carburizing treatment was performed in advance, the sintering between the shaft and the sintered camrozo proceeded quickly in the heating furnace, and since the sintering was caused by metallurgical bonding, the sintering between the shaft and the sintered camrozo was prevented. It will become stronger.
また、シャフトを予め切削加工してジャーナル部を形成
した後、浸炭処理を施こすのでジャーナル部の耐摩耗性
を向上させることができる。Further, since the journal portion is formed by cutting the shaft in advance and then carburized, the wear resistance of the journal portion can be improved.
更に1本発明においては、炭素含有量の比較的低い炭素
鋼あるいは合金鋼をシャフトとして使用することができ
るので、カムシャフトを安価に且つ加工し易く製造でき
る。Furthermore, in the present invention, since carbon steel or alloy steel with a relatively low carbon content can be used for the shaft, the camshaft can be manufactured at low cost and easily.
第1図Fi、本発明のカムシャフトの製造方法の一実施
例を示す一部切欠き縦断側面図でるる。
図中。
1・・・浸炭処理した粉末合金製シャフト% 11・・
・浸炭層、2・・・ジャーナル部、3・・・焼結カムロ
ゾで第 l!l!!IFIG. 1 Fi is a partially cutaway vertical side view showing an embodiment of the camshaft manufacturing method of the present invention. In the figure. 1...Carburized powder alloy shaft% 11...
・Carburized layer, 2...Journal part, 3...Sintered Camrozo No.1! l! ! I
Claims (2)
シャフトにおいて、シャフトに浸炭処理を施こした後、
焼結カムロブを組み付けて炉中で焼結し、シャフトと焼
結カムロブとの接合部を金属学的接合により強固に焼着
したことを特徴とするカムシャフトの製造方法。(1) In a camshaft formed by baking a sintered cam lobe onto a steel shaft, after carburizing the shaft,
A method for manufacturing a camshaft, characterized in that a sintered cam lobe is assembled and sintered in a furnace, and the joint between the shaft and the sintered cam lobe is firmly sintered by metallurgical bonding.
ル部を形成した後に浸炭処理を施したことを特徴とする
特許請求の範囲第1項に記載のカムシャフトの製造方法
。(2) The method for manufacturing a camshaft according to claim 1, wherein the steel shaft is cut to form a journal portion, and then carburized.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12993985A JPS61288002A (en) | 1985-06-17 | 1985-06-17 | Production of cam shaft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12993985A JPS61288002A (en) | 1985-06-17 | 1985-06-17 | Production of cam shaft |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61288002A true JPS61288002A (en) | 1986-12-18 |
JPH0143803B2 JPH0143803B2 (en) | 1989-09-22 |
Family
ID=15022168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12993985A Granted JPS61288002A (en) | 1985-06-17 | 1985-06-17 | Production of cam shaft |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61288002A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55113805A (en) * | 1979-02-26 | 1980-09-02 | Nippon Piston Ring Co Ltd | Abrasion resistant member for internal combustion engine and production thereof |
-
1985
- 1985-06-17 JP JP12993985A patent/JPS61288002A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55113805A (en) * | 1979-02-26 | 1980-09-02 | Nippon Piston Ring Co Ltd | Abrasion resistant member for internal combustion engine and production thereof |
Also Published As
Publication number | Publication date |
---|---|
JPH0143803B2 (en) | 1989-09-22 |
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