JPH05180304A - Sintering cam - Google Patents
Sintering camInfo
- Publication number
- JPH05180304A JPH05180304A JP35776291A JP35776291A JPH05180304A JP H05180304 A JPH05180304 A JP H05180304A JP 35776291 A JP35776291 A JP 35776291A JP 35776291 A JP35776291 A JP 35776291A JP H05180304 A JPH05180304 A JP H05180304A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- sintered
- hardened layer
- hardness
- floor
- 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
Landscapes
- Gears, Cams (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関の動弁機構等
に使用される焼結カムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered cam used in a valve mechanism of an internal combustion engine.
【０００２】[0002]
【従来の技術】図３は、焼結カム１が中空状のアルミニ
ウム製軸部材２にはめ込まれて接合されたカムシャフト
を示すものである。このカムシャフトは、内燃機関のタ
ペットやロッカーアーム等のカムフロアを所定のタイミ
ングで動作させるために広く用いられている。2. Description of the Related Art FIG. 3 shows a cam shaft in which a sintered cam 1 is fitted and joined to a hollow aluminum shaft member 2. This camshaft is widely used to operate a cam floor such as a tappet or a rocker arm of an internal combustion engine at a predetermined timing.
【０００３】[0003]
【発明が解決しようとする課題】ところで近年、この種
のカムシャフトにおいては、カム１との摩擦により生じ
るカムフロア側の摩耗や損傷をできるだけ小さくするこ
とが要求されている。ところがこの点に付いて従来は十
分検討されていなかった。By the way, in recent years, in this type of camshaft, it is required to minimize wear and damage on the cam floor side caused by friction with the cam 1. However, this point has not been sufficiently studied in the past.
【０００４】本発明は前記事情に鑑みてなされたもの
で、カムフロア側にできるだけ摩耗や損傷を与えない、
すなわち相手攻撃性において有利な焼結カムを提供する
ことを目的とする。The present invention has been made in view of the above-mentioned circumstances, and the cam floor side is not worn or damaged as much as possible.
That is, it is an object to provide a sintered cam that is advantageous in terms of opponent attack.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、相手攻撃
性において有利な焼結カムを得るべく鋭意研究を重ねた
結果、次の条件を備えた焼結カムが相手攻撃性において
顕著な効果を有するとの知見を得、本発明に想到した。
すなわち請求項１の焼結カムは、鉄系材料を焼結させて
なる焼結カムであって、全体が硬さＨＲＣ４０〜６８に
仕上げられた密度６．８〜７．８ｇ／ｃｍ3のものであ
る。また請求項２の焼結カムは、鉄系材料を焼結させて
なる焼結カムであって、カムフロアと接する領域にその
部分の硬さがＨＲＣ４０〜６８となるように硬化層が形
成され、この硬化層の深さがカムフロアの作動量が大の
部分ほど深く形成された密度６．８〜７．８ｇ／ｃｍ3
のものである。As a result of intensive studies by the inventors of the present invention to obtain a sintered cam which is advantageous in attacking opponents, a sintered cam having the following conditions is remarkable in attacking opponents. The present invention was conceived based on the finding that it has an effect.
That is, the sintered cam according to claim 1 is a sintered cam obtained by sintering an iron-based material, and has a density of 6.8 to 7.8 g / cm 3 which is finished to an overall hardness of HRC 40 to 68. Is. The sintered cam according to claim 2 is a sintered cam obtained by sintering an iron-based material, and a hardened layer is formed in a region in contact with the cam floor so that the hardness of the portion becomes HRC40 to 68. The hardness of the hardened layer is such that the greater the operation amount of the cam floor is, the deeper the density is 6.8 to 7.8 g / cm 3.
belongs to.
【０００６】[0006]
【作用】上記硬度と密度の両方を満足した焼結カムは、
滑り抵抗、転がり抵抗が小となる。また請求項２の焼結
カムは、カムフロアと接する領域に硬化層が形成され、
この硬化層の深さがカムフロアの作動量が大の部分ほど
深く形成されているので、カムフロアから受ける反力が
大きくなる部分ほど硬化層が厚くなっている。加えてこ
の請求項２の焼結カムは、前述のように硬化層を形成す
ることによって必要な硬さを付与したので、硬化層の内
側には硬化されていない層が存在し、この硬化されてい
ない層がカムに加わった衝撃を緩衝する。[Function] A sintered cam satisfying both the above hardness and density is
Slip resistance and rolling resistance are small. In the sintered cam according to claim 2, a hardened layer is formed in a region in contact with the cam floor,
Since the hardened layer is formed deeper as the operation amount of the cam floor is larger, the hardened layer is thicker at the portion where the reaction force received from the cam floor is larger. In addition, since the sintered cam according to claim 2 imparts the required hardness by forming the hardened layer as described above, an uncured layer exists inside the hardened layer, and the hardened layer is hardened. The shock absorbing layer does not impact the cam.
【０００７】[0007]
【実施例】以下、図面を参照して本発明の焼結カムを詳
しく説明する。 (実施例１)図１は本実施例の焼結カムを示すものであ
る。この焼結カム３の材質仕様は、黒鉛０．６％、残部
鉄である。この焼結カム３は全体が均一に硬化された、
すなわちマトリックス硬化相を有するものである。この
焼結カム３の硬さは約ＨＲＣ５０である。またこの焼結
カム３の密度は７．０ｇ／ｃｍ3である。この焼結カム
３は、水アマイド法で製造された鉄粉（見かけ密度３．
０ｇ／ｃｍ3、平均粒径１００μｍ）と黒鉛粉（平均粒
径１０μｍ）をＶ型混合機で約３０分混合し、これを約
６ｔｏｎ／ｃｍ2の圧力で単軸成形して圧粉密度７．０
ｇ／ｃｍ3の圧粉体を得、ついでこれを窒素雰囲気下で
６００℃×３０分予熱した後、１１００℃で２０分本焼
成することにより製造されたものである。この焼成カム
３を用いてカムシャフトを製造し、これを使用してガソ
リンエンジンのタペットやロッカーアームを動作させた
ところ、滑り抵抗や転がり抵抗が小さく、この焼成カム
３によればバルブの摩耗や損傷が極めて少ないことが判
明した。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sintering cam of the present invention will be described in detail below with reference to the drawings. (Embodiment 1) FIG. 1 shows a sintering cam of this embodiment. The material specifications of the sintering cam 3 are graphite 0.6% and the balance iron. The whole of the sintering cam 3 is hardened uniformly,
That is, it has a matrix hardening phase. The hardness of this sintered cam 3 is about HRC50. The density of this sintered cam 3 is 7.0 g / cm 3 . This sintered cam 3 is an iron powder (apparent density: 3.
0 g / cm 3 , average particle size 100 μm) and graphite powder (average particle size 10 μm) were mixed in a V-type mixer for about 30 minutes and uniaxially molded at a pressure of about 6 ton / cm 2 to obtain a green compact density of 7 .0
It was produced by obtaining a green compact of g / cm 3 and then preheating this at 600 ° C. for 30 minutes in a nitrogen atmosphere and then firing at 1100 ° C. for 20 minutes. When a camshaft was manufactured using this baking cam 3 and a tappet or rocker arm of a gasoline engine was operated using this camshaft, the sliding resistance and rolling resistance were small. It was found that the damage was extremely small.
【０００８】（実施例２）成形条件および焼成条件を変
化させ、他の条件は実施例１と同様にして、表１に示す
密度および硬さを有する焼結カムを各種製造した。つい
でこれら焼結カムを２５００ｒｐｍで回転させてガソリ
ンエンジンのバルブを動作させ、１０００時間後のタペ
ットの摩耗量を調べた。結果を表１に示す。Example 2 Various sintering cams having the density and hardness shown in Table 1 were manufactured in the same manner as in Example 1 except that the molding conditions and firing conditions were changed. Then, these sintered cams were rotated at 2500 rpm to operate the valve of the gasoline engine, and the wear amount of the tappet after 1000 hours was examined. The results are shown in Table 1.
【０００９】◎◎
【表１】 [Table 1]
【００１０】表１の結果から、硬さがＨＲＣ４０〜６８
でありかつ密度が６．８〜７．８ｇ／ｃｍ3の範囲にあ
る焼結カムによれば、タペット摩耗量が非常に少ないこ
とが判明した。From the results shown in Table 1, hardness is HRC 40-68.
It was found that the amount of tappet wear was very small with the sintered cam having a density of 6.8 to 7.8 g / cm 3 .
【００１１】（実施例３）図２は本実施例の焼結カムを
示すものである。この焼結カム６では、カムフロアと接
する領域（作動領域）４に、図中多数の点を付して示す
ように硬さがＨＲＣ４０〜６８の硬化層５を形成した。
この硬化層５の深さはカムフロアの変位量、すなわちカ
ムフロアの作動量が大の部分ほど深く形成されている。
この焼結カムは、焼成体を製造した後、硬化層５を深く
形成する部分と浅く形成する部分に対してマスキングや
配置を調整して、浸炭処理を施し、これを油焼き入れし
硬化層５を形成させることにより製造されたものであ
る。この実施例の焼結カム６では、作動領域４に硬化層
５を形成し、この硬化層５の深さをカムフロアの作動量
が大の部分ほど深く形成したので、カムフロアから受け
る反力が大きくなる部分ほど硬化層５が厚くなってい
る。従ってこの焼結カムは、必要な部分に十分な硬度が
付与されたものとなる。またこの実施例の焼結カム６
は、前述のように硬化層５を形成することによって必要
な硬さを付与したので、硬化層５の内側には硬化されて
いない層が存在し、この硬化されていない層がカム６に
加わった衝撃を緩衝する。従ってこの実施例の焼結カム
６によれば軸部材に加わる衝撃を和らげることができ
る。(Embodiment 3) FIG. 2 shows a sintering cam of this embodiment. In this sintered cam 6, a hardened layer 5 having a hardness of HRC 40 to 68 is formed in a region (operating region) 4 in contact with the cam floor as indicated by a number of dots in the figure.
The hardened layer 5 is formed such that the greater the displacement amount of the cam floor, that is, the operation amount of the cam floor, the deeper the hardened layer 5 is.
After the sintered cam is manufactured, the hardened layer 5 is carburized by adjusting the masking and arrangement for the deeply formed portion and the shallowly formed portion of the hardened layer 5 and then carburizing the hardened layer 5 for oil hardening. It is manufactured by forming 5. In the sintered cam 6 of this embodiment, the hardened layer 5 is formed in the working area 4, and the hardened layer 5 is formed deeper as the working amount of the cam floor is larger. Therefore, the reaction force received from the cam floor is large. The hardened layer 5 becomes thicker as it becomes. Therefore, the sintered cam has sufficient hardness in necessary parts. Further, the sintering cam 6 of this embodiment
Since the required hardness was imparted by forming the hardened layer 5 as described above, an uncured layer exists inside the hardened layer 5, and the uncured layer joins the cam 6. Cushion the shock. Therefore, according to the sintered cam 6 of this embodiment, the impact applied to the shaft member can be softened.
【００１２】[0012]
【発明の効果】以上説明したように請求項１の焼結カム
は、鉄系材料を焼結させてなる焼結カムであって、全体
が硬さＨＲＣ４０〜６８に仕上げられた密度６．８〜
７．８ｇ／ｃｍ3のものなので、滑り抵抗、転がり抵抗
等が小となる。従ってこの焼結カムによれば、タペット
やロッカーアーム等のカムフロアに与える損傷や摩耗が
小となる。また請求項２の焼結カムは、カムフロアと接
する領域に硬化層が形成され、この硬化層の深さがカム
フロアの作動量が大の部分ほど深く形成されているの
で、カムフロアから受ける反力が大きくなる部分ほど硬
化層が厚くなっている。従ってこの焼結カムは、必要な
部分に十分な硬度が付与されたものとなる。またこの請
求項２の焼結カムは、前述のように硬化層を形成するこ
とによって必要な硬さを付与したので、硬化層の内側に
は硬化されていない層が存在し、この硬化されていない
層がカムに加わった衝撃を緩衝する。従ってこの焼結カ
ムによれば軸部材に加わる衝撃を和らげることができ
る。As described above, the sintered cam according to claim 1 is a sintered cam obtained by sintering an iron-based material, and has a density of 6.8 which is finished to have a hardness of HRC 40 to 68. ~
Since it is 7.8 g / cm 3 , slip resistance and rolling resistance are small. Therefore, with this sintered cam, the damage and wear on the cam floor of the tappet, rocker arm, etc. are reduced. In the sintered cam according to claim 2, a hardened layer is formed in a region in contact with the cam floor, and the hardened layer is formed deeper as the operation amount of the cam floor is larger. The larger the area, the thicker the cured layer. Therefore, the sintered cam has sufficient hardness in necessary parts. Further, in the sintered cam according to the second aspect, since the required hardness is imparted by forming the hardened layer as described above, an uncured layer exists inside the hardened layer, and the hardened layer is hardened. The non-layer cushions the impact on the cam. Therefore, according to this sintered cam, the impact applied to the shaft member can be softened.
【図１】実施例１の焼結カムを示す正面図。FIG. 1 is a front view showing a sintering cam according to a first embodiment.
【図２】実施例２の焼結カムを示す正面図。2 is a front view showing a sintering cam of Example 2. FIG.
【図３】内燃機関で使用されているカムシャフトの一般
的な構造を示す斜視図。FIG. 3 is a perspective view showing a general structure of a camshaft used in an internal combustion engine.
１……焼結カム、２……軸部材、３……焼結カム、４…
…作動領域、５……硬化層、６……焼結カム。1 ... Sintering cam, 2 ... Shaft member, 3 ... Sintering cam, 4 ...
… Operating area, 5 …… Hardening layer, 6 …… Sintering cam.
Claims (2)
って、全体が硬さＨＲＣ４０〜６８に仕上げられた密度
６．８〜７．８ｇ／ｃｍ3の焼結カム。1. A sintered cam obtained by sintering an iron-based material, the sintered cam having a density of 6.8 to 7.8 g / cm 3 and an overall hardness of HRC 40 to 68.
って、カムフロアと接する領域にその部分の硬さがＨＲ
Ｃ４０〜６８となるように硬化層が形成されかつこの硬
化層の深さがカムフロアの作動量が大の部分ほど深く形
成された密度６．８〜７．８ｇ／ｃｍ3の焼結カム。2. A sintered cam obtained by sintering an iron-based material, the hardness of which is HR in a region in contact with the cam floor.
A sintered cam having a density of 6.8 to 7.8 g / cm 3 in which a hardened layer is formed to have C40 to 68, and the depth of the hardened layer is deeper as the operation amount of the cam floor is larger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35776291A JPH05180304A (en) | 1991-12-26 | 1991-12-26 | Sintering cam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35776291A JPH05180304A (en) | 1991-12-26 | 1991-12-26 | Sintering cam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05180304A true JPH05180304A (en) | 1993-07-20 |
Family
ID=18455799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35776291A Pending JPH05180304A (en) | 1991-12-26 | 1991-12-26 | Sintering cam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05180304A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003505245A (en) * | 1999-03-03 | 2003-02-12 | エス エー ゼキジシェ エレクトロネンシュトラール ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for manufacturing a camshaft and camshaft manufactured according to this method |
-
1991
- 1991-12-26 JP JP35776291A patent/JPH05180304A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003505245A (en) * | 1999-03-03 | 2003-02-12 | エス エー ゼキジシェ エレクトロネンシュトラール ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for manufacturing a camshaft and camshaft manufactured according to this method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19990817 |