JPH066780B2 - Combination of cam nose and rocker pad - Google Patents
Combination of cam nose and rocker padInfo
- Publication number
- JPH066780B2 JPH066780B2 JP61008993A JP899386A JPH066780B2 JP H066780 B2 JPH066780 B2 JP H066780B2 JP 61008993 A JP61008993 A JP 61008993A JP 899386 A JP899386 A JP 899386A JP H066780 B2 JPH066780 B2 JP H066780B2
- Authority
- JP
- Japan
- Prior art keywords
- less
- cam nose
- weight
- rocker
- combination
- 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
Links
- 239000002245 particle Substances 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 238000005245 sintering Methods 0.000 description 12
- 239000007791 liquid phase Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 150000001247 metal acetylides Chemical class 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
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、高面圧のかかる摺動面に発生しやすい摩耗を
低減し、ピッチング摩耗を防止した内燃機関用動弁機構
における焼結合金製カムノーズとロッカーパッドの組合
せに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a sintered alloy in a valve operating mechanism for an internal combustion engine, which reduces wear that is likely to occur on a sliding surface to which high surface pressure is applied, and prevents pitting wear. The present invention relates to a combination of a cam nose and a rocker pad.
（従来技術） 内燃機関、例えば４サイクルエンジンは、燃焼用の混合
気をシリンダ内に取り入れ、また、燃焼後のガスを排出
するために、１個のシリンダに吸気バルブと排気バルブ
を備えている。このバルブをピストンの上下運動に合わ
せて適当な時期に開閉する手段としては、通常カムシャ
フトとロッカーアームを組合せて使用している。(Prior Art) An internal combustion engine, for example, a four-cycle engine, is provided with an intake valve and an exhaust valve in one cylinder in order to take a mixture for combustion into a cylinder and to discharge gas after combustion. . A camshaft and a rocker arm are usually used in combination as a means for opening and closing this valve at an appropriate time according to the vertical movement of the piston.
このような動弁系において、カムシャフトとロッカーア
ームの摺動部を形成する材料として、チル鋳物、焼入れ
鋼などが使用されていた。In such a valve train, chill casting, hardened steel, etc. have been used as materials for forming the sliding portion between the camshaft and rocker arm.
（発明が解決しようとする問題点） チル鋳物、焼入れ鋼などの材料では、耐摩耗性の面で必
ずしも充分満足すべきものではなく、カーボンスラッジ
で潤滑油が汚染されるディーゼルエンジンや有鉛ガソリ
ンを燃料とするエンジンに使用するときは、これら汚染
物質によるカムシャフトおよびロッカーアームの摺動面
の摩耗が多くなる傾向があり、また、機能上高面圧で使
用されるためピッチング摩耗が発生するという問題が生
じた。(Problems to be solved by the invention) Materials such as chill castings and hardened steels are not always satisfactory in terms of wear resistance. When used in an engine that is used as a fuel, the sliding surfaces of the camshaft and rocker arm tend to wear more due to these pollutants, and because they are used under high surface pressure functionally, pitching wear occurs. There was a problem.
この問題を解決するため、最近、焼結合金がロッカーア
ームの摺動部材として使用されている。焼結合金製ロッ
カーアーム自体は耐摩耗性に非常に優れているが、反面
相手材であるカムシャフトの摺動面の摩耗が比較的多く
なるという問題がある。In order to solve this problem, recently, a sintered alloy has been used as a sliding member of a rocker arm. The sintered alloy rocker arm itself is very excellent in wear resistance, but on the other hand, there is a problem that the sliding surface of the camshaft, which is a mating material, is relatively worn.
本発明は、上記の動弁系において、耐摩耗性を改善しピ
ッチング摩耗を防止し得る動弁部材の組合せ、即ちカム
シャフトとロッカーアームの摺動面を形成する材料の組
合せを提供することを目的とする。The present invention provides a combination of valve members capable of improving wear resistance and preventing pitching wear in the above valve train, that is, a combination of materials forming a sliding surface of a cam shaft and a rocker arm. To aim.
（問題点を解決するための手段） このカムシャフトとロッカーアームの摺動部材の組合
せ、具体的に言えば、カムノーズとロッカーパッドの組
合せは、耐摩耗性焼結合金により構成されるものであ
る。(Means for Solving the Problems) This combination of the camshaft and the sliding member of the rocker arm, more specifically, the combination of the cam nose and the rocker pad is made of a wear-resistant sintered alloy. .
Ｃ：１．０〜３．５重量％、Ｃｒ：３．０〜２５．０重
量％、Ｐ：０．２〜１．０重量％、Ｃｕ、Ｎｉ、Ｍｏの
うちいずれか１種あるいは２種以上の合計が３．０重量
％以下、および残部Ｆｅを組成とし、１２００℃以下で
液相焼結することにより気孔率５％以下、空孔の大きさ
を径５０μｍ以下に微細化した焼結合金からなるカムノ
ーズと、Ｃ：１．０〜３．５重量％、Ｃｒ：３．０〜１
０．０重量％、Ｐ：０．２〜１．０重量％、Ｃｕ、Ｎ
ｉ、Ｍｏのうち１種あるいは２種以上の合計が３．０重
量％以下、および残部Ｆｅを組成とし、１２００℃以下
で液相焼結することにより気孔率５％以下、空孔の大き
さを径５０μｍ以下に微細化した焼結合金の基地中に、
粒径が１００メッシュ以下のＴｉＮ粒子が、５．０〜２
０．０重量％分散されている焼結合金からなるロッカー
パッドが互いに摺接するカムノーズとロッカーパッドの
組合せであり、且つ、カムノーズのＣｒ含有量がロッカ
ーパッドのＣｒ含有量の１〜２倍である組合せからなる
ことを特徴とするものである。C: 1.0 to 3.5% by weight, Cr: 3.0 to 25.0% by weight, P: 0.2 to 1.0% by weight, any one or two of Cu, Ni and Mo. The above-mentioned total is 3.0 wt% or less, and the balance is Fe, and liquid phase sintering is performed at 1200 ° C. or less to reduce porosity to 5% or less and pore size to 50 μm or less. Cam nose made of gold, C: 1.0 to 3.5% by weight, Cr: 3.0 to 1
0.0% by weight, P: 0.2 to 1.0% by weight, Cu, N
One or more of i and Mo are 3.0 wt% or less in total, and the balance is Fe, and liquid phase sintering is performed at 1200 ° C. or less to obtain porosity of 5% or less and pore size. In a matrix of sintered alloy with a diameter of 50 μm or less,
TiN particles having a particle size of 100 mesh or less are 5.0 to 2
A combination of a cam nose and a rocker pad in which rocker pads made of a sintered alloy having 0.0% by weight dispersed therein are in sliding contact with each other, and the Cr content of the cam nose is 1 to 2 times the Cr content of the rocker pad. It is characterized by comprising a combination.
上記組成の焼結合金の組合せは、耐摩耗性に非常に優
れ、しかも液相焼結によって高密度であるため、カムノ
ーズやロッカーパッドのように比較的高面圧下で使用さ
れる摺動部品に特に適しているものである。The combination of sintered alloys with the above composition has excellent wear resistance and high density due to liquid phase sintering, so it can be used for sliding parts used under relatively high surface pressure such as cam nose and rocker pad. It is particularly suitable.
（作用） 以下に本発明の焼結合金における各成分の作用およびそ
の成分の限定理由について述べる。(Function) The function of each component in the sintered alloy of the present invention and the reason for limiting the component will be described below.
先ず、カムノーズについて説明する。First, the cam nose will be described.
Ｃは、基地を強化しＣｒ炭化物（Ｆｅ、Ｃｒ複合炭化物
を含む）を形成させる重要な元素であり、Ｃｒと共に耐
摩耗性を具備するのに必要である。１．０重量％以下で
は炭化物の析出量が少なく、基地の硬さも低下するため
耐摩耗性が著しく悪化する。３．５重量％を超えると炭
化物が多くなり、また、基地も硬くなり脆化し、ピッチ
ング摩耗を発生し易くなる。C is an important element that strengthens the matrix and forms Cr carbides (including Fe and Cr composite carbides), and is necessary to have wear resistance together with Cr. If it is 1.0% by weight or less, the amount of precipitated carbide is small and the hardness of the matrix is lowered, so that the wear resistance is significantly deteriorated. If it exceeds 3.5% by weight, the amount of carbides increases, and the matrix becomes hard and brittle, so that pitching wear is likely to occur.
Ｃｒは、基地の強化およびＣと化合し炭化物を形成させ
るのに必要不可欠の元素であり、３．０重量％以下では
炭化物析出量が少なく耐摩耗性が低下し、２５．０重量
％を超えると炭化物が多量に析出し、材料が脆くなり機
械加工が困難となり使用に耐えなくなる。Cr is an indispensable element for strengthening the matrix and combining with C to form a carbide. When the content is 3.0% by weight or less, the amount of precipitation of the carbide is small and the wear resistance decreases, and it exceeds 25.0% by weight. If a large amount of carbide is deposited, the material becomes brittle and machining becomes difficult, making it unusable.
ピッチング摩耗は、カムノーズ、ロッカーパッドのよう
に高面圧下で使用される摺動部材に発生しやすく、摺動
中に繰り返し荷重を受ける表面層の疲労により生ずるも
のとされ、通常の空孔の多い焼結合金では空孔による強
度低下により発生しやすい。Pitching wear is likely to occur on sliding members such as cam nose and rocker pad that are used under high surface pressure, and is caused by fatigue of the surface layer that is repeatedly subjected to load during sliding. In sintered alloys, it is likely to occur due to strength reduction due to pores.
そのため、本発明の動弁部材の組合せは、両材料とも液
相焼結により製造し、ピッチング摩耗を防止するもので
ある。液相焼結は高温で焼結することにより可能である
が、炉の耐久性および経済性の問題から１２００℃以下
で焼結することが必要である。Therefore, the valve operating member combination of the present invention is manufactured by liquid phase sintering both materials to prevent pitting wear. Liquid phase sintering can be performed by sintering at a high temperature, but it is necessary to perform sintering at 1200 ° C. or lower in view of durability and economical efficiency of the furnace.
Ｐは、比較的低温で液相を生じさせ、気孔率を低下さ
せ、空孔を微細なものとするために必要であり、また、
ステダイトの形成により耐摩耗性の改善にも寄与してい
る。０．２重量％以下では、液相の発生量が少なく、十
分に気孔率を低下させることができず強度の向上が得ら
れず、従って、摺動に際してはピッチング摩耗が発生し
易くなる。１．０重量％を超えると液相が出過ぎて寸法
精度の高い焼結体が得られない。P is necessary to generate a liquid phase at a relatively low temperature, reduce the porosity, and make the pores fine, and
The formation of steadite also contributes to the improvement of wear resistance. When it is 0.2% by weight or less, the amount of liquid phase generated is small, the porosity cannot be sufficiently lowered, and the strength cannot be improved. Therefore, pitting wear is likely to occur during sliding. If it exceeds 1.0% by weight, the liquid phase is excessively produced and a sintered body with high dimensional accuracy cannot be obtained.
Ｃｕ、Ｎｉ、Ｍｏはいずれも基地に固溶して、機械的強
度を改善する元素であるが、３．０重量％以下の添加で
その目的は十分に達成でき、３．０重量％を超えると比
較的高価な金属であるため経済性の点で不都合となる。Cu, Ni, and Mo are all elements that form a solid solution in the matrix to improve the mechanical strength, but the addition of 3.0 wt% or less can sufficiently achieve the purpose, and exceeds 3.0 wt%. Since it is a relatively expensive metal, it is inconvenient in terms of economy.
次に、ロッカーパッドについて説明する。Next, the rocker pad will be described.
Ｃは、基地を強化しＣｒ炭化物（Ｆｅ、Ｃｒ複合炭化物
を含む）を形成させる重要な元素であり、Ｃｒと共に耐
摩耗性を具備するのに必要である。１．０重量％以下で
は炭化物の析出量が少なく、基地の硬さも低下するため
耐摩耗性が著しく悪化する。３．５重量％を超えると炭
化物が多くなり、また、基地も硬くなり脆化し、ピッチ
ング摩耗を発生の危険性が生じてくる。C is an important element that strengthens the matrix and forms Cr carbides (including Fe and Cr composite carbides), and is necessary to have wear resistance together with Cr. If it is 1.0% by weight or less, the amount of precipitated carbide is small and the hardness of the matrix is lowered, so that the wear resistance is significantly deteriorated. If it exceeds 3.5% by weight, the amount of carbides increases, and the matrix becomes hard and brittle, and there is a risk of causing pitting wear.
Ｃｒは、基地の強化およびＣと化合し、炭化物を形成さ
せるのに必要不可欠の元素であるが、これが少ないと炭
化物析出量が少なく耐摩耗性が低下するので３．０重量
％とする。Cr is an indispensable element for strengthening the matrix and combining with C to form a carbide, but if the amount of this is small, the amount of precipitated carbide is small and the wear resistance is lowered, so it is made 3.0% by weight.
また、本発明では後述するように、ロッカーパッドの基
地中にＴｉＮ粒子（硬質粒子）を分散させているが、ロ
ッカーパッドの基地中にＴｉＮ粒子を分散させた本発明
においては、前記カムノーズの場合より少量のＣｒ含有
量とすることができ、１０％重量％以下で充分である。Further, in the present invention, as will be described later, TiN particles (hard particles) are dispersed in the base of the rocker pad, but in the present invention in which TiN particles are dispersed in the base of the rocker pad, in the case of the cam nose A smaller Cr content is possible, and 10% by weight or less is sufficient.
Ｐ、Ｃｕ、Ｎｉ、Ｍｏは、前記カムノーズと同様であ
り、Ｐについては、０．２重量％以下では液相の発生量
が少なく、充分に気孔率を低下させることができず、強
度の向上が得られず、１．０重量％を超えると液相が出
過ぎて寸法精度の高い焼結体が得られない。P, Cu, Ni, and Mo are the same as those of the cam nose, and when P is 0.2% by weight or less, the amount of liquid phase generated is small, the porosity cannot be sufficiently reduced, and the strength is improved. However, if it exceeds 1.0% by weight, the liquid phase is excessively produced and a sintered body with high dimensional accuracy cannot be obtained.
Ｃｕ、Ｎｉ、Ｍｏについては、３．０重量％以下の添加
でその目的は十分に達成でき、３．０重量％を超えると
比較的高価な金属であるため経済性の点で不都合とな
る。With respect to Cu, Ni and Mo, addition of 3.0% by weight or less can sufficiently achieve the purpose, and if it exceeds 3.0% by weight, it is a relatively expensive metal, which is disadvantageous in terms of economy.
ロッカパッドについても、カムノーズと同様の理由で液
相焼結を行う。Liquid phase sintering is also performed on the rocker pad for the same reason as for the cam nose.
次に、分散相であるＴｉＮ粒子は、前記カムノーズ材に
含まれるＣｒ炭化物と同様に硬質であり耐摩耗性に寄与
する。Next, the TiN particles, which are the dispersed phase, are as hard as the Cr carbide contained in the cam nose material and contribute to the wear resistance.
ＴｉＮは硬さがＨMV２０００〜２５００と高く、このＴ
ｉＮを分散することで、耐摩耗性が改善される。さら
に、非金属のＴｉＮが摺動面に介在することで、金属−
金属の摺動だけではなく、金属−金属、金属−セラミッ
ク（ＴｉＮ）の複合した摺動になり、耐焼付性が向上す
る。The hardness of TiN is as high as HMV2000 to 2500, and T
Wear resistance is improved by dispersing iN. Furthermore, since non-metallic TiN is present on the sliding surface, metal-
Not only sliding of metal but also sliding of composite of metal-metal and metal-ceramic (TiN), and seizure resistance is improved.
ＴｉＮの粒径は、平均２〜７０μｍの範囲で、且つ、最
大粒径が１００メッシュ（１４７μｍ）以下が好適であ
る。平均粒径が２μｍ以下では均一に分散させるのが困
難となり、摺動によって脱落し易く耐摩耗性が低下す
る。最大粒径が１４７μｍを超えると相手摺動部材を傷
付けるようになる。分散量については、５．０重量％以
下ではその効果が少なく、２０．０重量％を超えても耐
摩耗性に顕著な効果が認められず、高価な材料であるた
めいたらるに価格の上昇を招くだけであり、しかも被削
性が悪くなる。The average particle size of TiN is preferably 2 to 70 μm, and the maximum particle size is preferably 100 mesh (147 μm) or less. If the average particle size is 2 μm or less, it becomes difficult to disperse the particles uniformly, and the particles easily fall off due to sliding, and wear resistance decreases. If the maximum particle size exceeds 147 μm, the mating sliding member will be damaged. Regarding the amount of dispersion, if it is 5.0% by weight or less, the effect is small, and if it exceeds 20.0% by weight, no remarkable effect on wear resistance is observed, and it is an expensive material. Not only leads to deterioration in machinability.
ＴｉＮをロッカーパッド材のみにＴｉＮ粒子を分散させ
るのは、カムノーズに比してロッカーパッドの方が単位
時間当りの摺動距離が長くより苛酷な摺動環境下におか
れるためである。The reason why TiN particles are dispersed only in the rocker pad material is that the rocker pad has a longer sliding distance per unit time than a cam nose and is placed in a more severe sliding environment.
カムノーズ材とロッカーパッドのＣｒ含有量の比につい
て説明する。The ratio of the Cr content of the cam nose material and the rocker pad will be described.
カムノーズのＣｒ含有量がロッカーパッドのＣｒ含有量
より少ない場合（１倍未満）、ロッカーパッドの摩耗は
少ないが、カムノーズの摩耗が大きくなる。また、逆に
カムノーズのＣｒ含有量がロッカーパッドのＣｒ含有量
の２倍を超えるとロッカーパッドの摩耗が増大する。そ
れ故、本発明では、カムノーズのＣｒ含有量をロッカー
パッドのＣｒ含有量の１〜２倍とし、両部材の耐摩耗特
性のバランスを図っている。When the Cr content of the cam nose is less than the Cr content of the rocker pad (less than 1 time), the wear of the rocker pad is small, but the wear of the cam nose is large. On the contrary, if the Cr content of the cam nose exceeds twice the Cr content of the rocker pad, the wear of the rocker pad increases. Therefore, in the present invention, the Cr content of the cam nose is set to be 1 to 2 times the Cr content of the rocker pad to balance the wear resistance characteristics of both members.
（実施例） 本発明の実施例を表および図を参照しながら説明する。(Examples) Examples of the present invention will be described with reference to tables and drawings.
表１に示す目標成分に原料粉末を配合し、これを潤滑剤
としてステアリン酸亜鉛粉末０．７％を添加し、これを
Ｖ型混合機で少なくとも２０分間混合し、これら混合粉
を７ton/cm2の成形圧で成形し、第１図（ａ）のカムノ
ーズ圧粉体１ａとロッカーパッド圧粉体２を製造した。
このカムノーズ圧粉体１ａに円筒４を取付け、真空炉で
表１に示す焼結温度で６０分間加熱の焼結を行い、真密
度比９６〜９８％の焼結カムノーズ１とすると共に円筒
２に拡散接合層５を介して拡散接合してカムピース３と
した。カムピース３は、出願人の１人が既に提案してい
る特願昭５９−７５８２号に示すように、鋼製パイプを
拡管することによりカム駒およびジャーナルと結合され
てなるカムシャフトにおいて、前記カム駒が内周面に噛
合部を有する円筒に、耐摩耗性材料のカムノーズを接合
して形成するという製造方法によりカムシャフトとし
た。ロッカーパッド圧粉体２はカムノーズ圧粉体１ａと
同様に、真空炉で表１に示す焼結温度で６０分間加熱の
焼結をして焼結ロッカーパッドとし、加工後ロッカーア
ーム本体に固着しロッカーアームとした。Raw material powder was blended with the target components shown in Table 1, 0.7% of zinc stearate powder was added as a lubricant, and this was mixed with a V-type mixer for at least 20 minutes, and these mixed powders were mixed at 7 ton / cm. molded in second shaping pressure, to produce a nose compact 1a and the rocker pad green compact 2 of FIG. 1 (a).
A cylinder 4 is attached to the cam nose green compact 1a, and sintering is performed by heating in a vacuum furnace at a sintering temperature shown in Table 1 for 60 minutes to obtain a sintered cam nose 1 having a true density ratio of 96 to 98% and a cylinder 2. The cam piece 3 was diffusion-bonded via the diffusion-bonding layer 5. As shown in Japanese Patent Application No. 59-7582, which has been already proposed by one of the applicants, the cam piece 3 is a cam shaft which is connected to a cam piece and a journal by expanding a steel pipe. A camshaft was manufactured by a manufacturing method in which a cam nose made of a wear-resistant material was joined to a cylinder having a meshing portion on its inner peripheral surface. The rocker pad green compact 2 is, like the cam nose green compact 1a, sintered by heating for 60 minutes in a vacuum furnace at the sintering temperature shown in Table 1 to form a sintered rocker pad, which is fixed to the rocker arm body after processing. It was a rocker arm.
尚、カムノーズおよびロッカーパッドとした合金は表３
に示す通りであり、各合金（Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆ、
Ｇ、Ｈ）の焼結後の化学成分は表２の通りであった。Table 3 shows the alloys used for the cam nose and rocker pad.
And each alloy (A, B, C, D, E, F,
Table 2 shows the chemical components of G and H) after sintering.
これらカムシャフトはロッカーアームを表３に示すよう
に、カムノーズのＣｒ量とロッカーパッドのＣｒ量の比
を変えた組合せ、またＴｉＮ含有ロッカーパッドとの組
合せで６気筒ディーゼルエンジンのモータリング装置に
組み込んで耐久試験を行い、カムノーズおよびロッカー
パッドの摩耗量を測定した。As shown in Table 3, these camshafts are assembled in a motoring device of a 6-cylinder diesel engine by combining the rocker arms with different ratios of the Cr amount of the cam nose and the Cr amount of the rocker pad, and with the TiN-containing rocker pad. The endurance test was carried out in order to measure the wear amount of the cam nose and rocker pad.
試験条件は次の通りである。The test conditions are as follows.
カムシャフト回転数：３５０r.p．ｍ 潤 滑 油 ：カーボンスラッジで汚染されたデ
ィーゼルエンジン劣化オイル 潤 滑 油 温 度：７０℃ 試 験 時 間 ：１００Ｈｒｓ． 試験結果は、第３図に示す通りである。同図には比較品
として、従来品のカムノーズ部をチルさせた鋳鉄製チル
カムシャフトとロッカーパッド部をチルさせた鋳鉄製ロ
ッカーアームの組合せについて、同様の試験を行った結
果が併記してある。Camshaft speed: 350r.p. m Lubricating oil: Diesel engine deteriorated oil contaminated with carbon sludge Lubricating oil temperature: 70 ° C Test time: 100 Hrs. The test results are as shown in FIG. As a comparative product, the same test results are also shown in the same figure for a combination of a cast iron chill cam shaft with the cam nose portion chilled and a cast iron rocker arm with the rocker pad portion chilled, as a comparative product. .
尚、摩耗量は従来品であるチルカムノーズおよびチルロ
ッカーパッドの摩耗量をそれぞれ１００とし、これとの
比較値で示してある。The amount of wear is shown as a comparison value with the amounts of wear of the conventional chill cam nose and chill rocker pad being 100, respectively.
（発明の効果） 第３図から明らかなように、本発明の組合せにおいては
いずれも従来のチルカムノーズとチルロッカーパッドに
比べて摩耗量は少なく、ピッチング摩耗も発生せず耐久
性に優れている。 (Effect of the Invention) As is apparent from FIG. 3, in the combination of the present invention, the wear amount is smaller than that of the conventional chill cam nose and chill rocker pad, and pitting wear does not occur and durability is excellent.
第１図 本発明のカムノーズの実施例を示す斜視図およ
び断面図 ａ）カムノーズ圧粉体の斜視図 ｂ）カムピースの横断面図 ｃ）カムピースの縦断面図 第２図 本発明のロッカーパッド圧粉体の斜視図 第３図 モータリング摩耗試験結果 １：カムノーズ焼結体 １ａ：カムノーズ圧粉体 ２：ロッカーパッド圧粉体 ３：カムピース ４：円筒 ５：拡散接合層FIG. 1 is a perspective view and a cross-sectional view showing an embodiment of a cam nose of the present invention. A) A perspective view of a cam nose powder compact b) A cross-sectional view of a cam piece c) A longitudinal cross-sectional view of a cam piece. FIG. Perspective view of body Fig. 3 Motoring wear test result 1: Cam nose sintered body 1a: Cam nose green compact 2: Rocker pad green compact 3: Cam piece 4: Cylindrical 5: Diffusion bonding layer
───────────────────────────────────────────────────── フロントページの続き 審査官 影山 秀一 (56)参考文献 特開 昭60−135556（ＪＰ，Ａ) 特開 昭59−16952（ＪＰ，Ａ) 特開 昭58−22358（ＪＰ，Ａ) 特開 昭55−2777（ＪＰ，Ａ) ─────────────────────────────────────────────────── --Continued from the front page Examiner Hidekazu Kageyama (56) References JP-A-60-135556 (JP, A) JP-A-59-16952 (JP, A) JP-A-58-22358 (JP, A) Special Features Kai 55-2777 (JP, A)
Claims (2)
〜２５．０重量％、Ｐ：０．２〜１．０重量％、Ｃｕ、
Ｎｉ、Ｍｏのうちいずれか１種あるいは２種以上の合計
が３．０重量％以下、および残部Ｆｅを組成とし、気孔
率５％以下、空孔の大きさを径５０μｍ以下に微細化し
た焼結合金からなる内燃機関用カムノーズと、Ｃ：１．
０〜３．５重量％、Ｃｒ：３．０〜１０．０重量％、
Ｐ：０．２〜１．０重量％、Ｃｕ、Ｎｉ、Ｍｏのうちい
ずれか１種あるいは２種以上の合計が３．０重量％以
下、および残部Ｆｅを組成とし、気孔率５％以下、空孔
の大きさを径５０μｍ以下に微細化した焼結合金の基地
中に、粒径が１００メッシュ以下のＴｉＮ粒子が、５．
０〜２０．０重量％分散されている焼結合金からなる内
燃機関用ロッカーパッドの組合せ。1. C: 1.0 to 3.5% by weight, Cr: 3.0
~ 25.0 wt%, P: 0.2-1.0 wt%, Cu,
One of Ni and Mo, or a total of two or more of them is 3.0% by weight or less, and the balance Fe is a composition, and porosity is 5% or less, and the size of the pores is refined to a diameter of 50 μm or less. An internal combustion engine cam nose made of bonded gold, and C: 1.
0 to 3.5% by weight, Cr: 3.0 to 10.0% by weight,
P: 0.2 to 1.0 wt%, one or more of Cu, Ni and Mo total 3.0 wt% or less, and the balance Fe, and porosity 5% or less, 4. TiN particles with a particle size of 100 mesh or less were found in the matrix of the sintered alloy in which the pore size was reduced to 50 μm or less.
A combination of rocker pads for an internal combustion engine, which consists of a sintered alloy in which 0 to 20.0% by weight is dispersed.
のＣｒ含有量の１．０〜２．０倍である特許請求の範囲
第１項記載の内燃機関用カムノーズとロッカーパッドの
組合せ。2. The combination of a cam nose and a rocker pad for an internal combustion engine according to claim 1, wherein the Cr content of the cam nose is 1.0 to 2.0 times the Cr content of the rocker pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61008993A JPH066780B2 (en) | 1986-01-21 | 1986-01-21 | Combination of cam nose and rocker pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61008993A JPH066780B2 (en) | 1986-01-21 | 1986-01-21 | Combination of cam nose and rocker pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62167860A JPS62167860A (en) | 1987-07-24 |
| JPH066780B2 true JPH066780B2 (en) | 1994-01-26 |
Family
ID=11708207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61008993A Expired - Lifetime JPH066780B2 (en) | 1986-01-21 | 1986-01-21 | Combination of cam nose and rocker pad |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066780B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04136140A (en) * | 1990-08-01 | 1992-05-11 | Riken Corp | Iron-based sintered material with excellent pitting and wear resistance |
| DE102010011420A1 (en) * | 2009-03-19 | 2010-09-30 | Schaeffler Technologies Gmbh & Co. Kg | Switchable drag lever of a valve train of an internal combustion engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609587B2 (en) * | 1978-06-23 | 1985-03-11 | トヨタ自動車株式会社 | Wear-resistant sintered alloy |
| JPS5822358A (en) * | 1981-07-30 | 1983-02-09 | Mitsubishi Metal Corp | Iron base sintered alloy for structural member of fuel supply apparatus |
| JPS5916952A (en) * | 1982-07-20 | 1984-01-28 | Mitsubishi Metal Corp | Fe-based sintered material excellent in wear resistance |
| JPS60135556A (en) * | 1983-12-23 | 1985-07-18 | Mitsubishi Metal Corp | Tip material joined to tip of stem of valve for internal- conbustion engine |
-
1986
- 1986-01-21 JP JP61008993A patent/JPH066780B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62167860A (en) | 1987-07-24 |
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