JP7222690B2 - 摺動部材 - Google Patents
摺動部材 Download PDFInfo
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- JP7222690B2 JP7222690B2 JP2018235153A JP2018235153A JP7222690B2 JP 7222690 B2 JP7222690 B2 JP 7222690B2 JP 2018235153 A JP2018235153 A JP 2018235153A JP 2018235153 A JP2018235153 A JP 2018235153A JP 7222690 B2 JP7222690 B2 JP 7222690B2
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
- C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
- C10M2201/066—Molybdenum sulfide
- C10M2201/0663—Molybdenum sulfide used as base material
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Description
本発明は、前記課題にかんがみてなされたもので、樹脂被覆層において適度な耐摩耗性を実現できる技術を提供することを目的とする。
(1)摺動部材の構成:
(2)摺動部材の製造方法:
(3)他の実施形態:
図1は、本発明の一実施形態にかかる摺動部材1の斜視図である。摺動部材1は、裏金10とライニング11とオーバーレイ12とを含む。摺動部材1は、中空状の円筒を直径方向に2等分した半割形状の金属部材であり、断面が半円弧状となっている。2個の摺動部材1を円筒状になるように組み合わせることにより、すべり軸受Aが形成される。すべり軸受Aは内部に形成される中空部分にて円柱状の相手材2(エンジンのクランクシャフト)を軸受けする。相手材2の外径はすべり軸受Aの内径よりもわずかに小さく形成されている。相手材2の外周面と、すべり軸受Aの内周面との間に形成される隙間に潤滑油(エンジンオイル)が供給される。その際に、すべり軸受Aの内周面上を相手材2の外周面が摺動する。
RpkとRaとは、それぞれJIS B0671-2002とJIS B0601-2001の表面粗さであり、オーバーレイ12の表面(摺動面)の表面粗さである。カットオフ値λcを0.08mmとした場合のRpk(0.08)は0.162μmであり、カットオフ値λcを0.8mmとした場合のRa(0.8)は0.151μmであった。RpkとRaは、小坂研究所社のサーフコーダSE-3400によって計測した。カットオフ値λcを0.08mmとすることにより、ライニング11表面に形成した約0.08mm周期の溝のうねりの影響を除去した粗さを示すRpk(0.08)を得ることができる。
摺動部材1を(a)半割基材形成工程と(b)塗布前処理工程と(c)第1塗布工程と(d)第2塗布工程と(e)乾燥工程と(f)焼成工程とを順に行うことによって形成した。ただし、摺動部材1の製造方法は前記の工程に限定されるものではない。
半割基材形成工程は、裏金10とライニング11とが接合した基材を半割状に形成する工程である。例えば、裏金10に相当する板材上においてライニング11の材料を焼結することにより、裏金10とライニング11とが接合した基材が形成されてもよい。また、裏金10とライニング11に相当する板材を圧延によって接合することにより、裏金10とライニング11とが接合した基材が形成されてもよい。さらに、プレス加工や切削加工等の機械加工を行うことにより、裏金10とライニング11とが接合した基材を半割状に加工してもよい。
塗布前処理工程は、ライニング11の表面に対するオーバーレイ12(樹脂被覆層)の密着性を向上させるための表面処理である。例えば、塗布前処理工程として、サンドブラスト等の粗面化処理を行ってもよいし、エッチングや化成処理などの化学処理を行ってもよい。なお、塗布前処理工程は、半割基材の油分を洗浄剤で脱脂した後に行うことが好ましい。
第1塗布工程は、ライニング11にオーバーレイ12の内層L2を塗布する工程である。第1塗布工程を行うにあたり、ポリアミドイミドのバインダー樹脂に二硫化モリブデン粒子12bと硫酸バリウム粒子12cとを混合した塗布液を調製する。また、二硫化モリブデン粒子12bと硫酸バリウム粒子12cの分散性を高めたり、塗布液の粘度を調整したりするために、必要に応じてN-メチル-2-ピロリドンやキシレン等の溶剤を用いてもよい。
その後、第2塗布工程において、第1塗布工程と同様に塗布液の塗布を行う。ただし、第2塗布工程においては、オーバーレイ12における二硫化モリブデン粒子12bの総体積の体積比が30体積%となり、硫酸バリウム粒子12cの総体積の体積比が15体積%となり、SiC粒子12dの総体積の体積分率が0.7±0.2体積%となるように混合した塗布液を使用する。なお、第1塗布工程と第2塗布工程との間に後述する乾燥工程を行ってもよい。
乾燥工程は、最表層L1と内層L2とを乾燥させる工程である。例えば、40~120℃で5~60分にわたって最表層L1と内層L2とを乾燥させる。
さらに例えば150~300℃で30~60分にわたって最表層L1と内層L2とを焼成(硬化)させた。
以上の工程により摺動部材1が完成する。
前記実施形態においては、内層L2にのみSiC粒子12dを混合したが、最表層L1にもSiC粒子12dを混合することにより、使用初期から耐摩耗性を向上させてもよい。この場合も、最表層L1におけるSiC粒子12dの含有量を、最表層L1におけるSiC粒子12dの含有量よりも小さくすることにより、使用初期におけるなじみ性を確保できる。反対に、最表層L1におけるSiC粒子12dの含有量を、最表層L1におけるSiC粒子12dの含有量よりも大きくすることにより、使用初期における耐摩耗性を向上させてもよい。また、塗布層の層数は3層以上であってもよい。
Claims (2)
- 基層と、前記基層上に形成された樹脂被覆層とを備える摺動部材であって、
前記樹脂被覆層は、
バインダーとしてのポリアミドイミド樹脂と、
硫酸バリウム粒子と、
二硫化モリブデン粒子と、
SiC粒子と、
不可避不純物と、からなり、
重ね塗りされた複数の塗布層によって構成され、複数の前記塗布層ごとに前記SiC粒子の含有量が異なり、複数の前記塗布層のうちの最表層に含まれる前記SiC粒子が他の層に含まれる前記SiC粒子よりも少ない、
摺動部材。 - 前記硫酸バリウム粒子の平均粒径は、0.3μm以上かつ0.7μm未満である、
請求項1に記載の摺動部材。
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