JP2018151048A - Slide member and engine component - Google Patents
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Abstract
Description
本発明は、摺動部材およびエンジン部品に関するものである。 The present invention relates to a sliding member and an engine component.
環境対応技術への関心が高まり、摺動部材を有する機械分野（例えば自動車メーカ等）では摺動部の低摩擦化が重要な課題となっている。そのため、潤滑剤の低粘度化が進められている。潤滑剤の低粘度化は流体潤滑領域の低摩擦化には有効であるが、油膜切れが生じやすくなり、焼付きの発生が問題となる。 In the field of machines having sliding members (for example, automobile manufacturers, etc.), it is important to reduce the friction of sliding parts. Therefore, the viscosity of the lubricant is being lowered. Although lowering the viscosity of the lubricant is effective for lowering the friction in the fluid lubrication region, the oil film is likely to be cut off and seizure is a problem.
摺動特性の改善手法の一つとして、油溜りとなるディンプル状の凹部を形成する技術が知られている（特許文献１）。特許文献１のものは、二つの摺動部材の少なくとも一方の摺動部材の摺動面全域、あるいは摺動面の一定の領域に、ディンプル状の凹部が略均一に設けられたものである。これにより、凹部に潤滑油を保持させ、摩擦損失や摩耗を低減する。 As one method for improving sliding characteristics, a technique for forming a dimple-like recess that serves as an oil reservoir is known (Patent Document 1). In Patent Document 1, dimple-shaped concave portions are provided substantially uniformly in the entire sliding surface of at least one of the two sliding members or in a certain region of the sliding surface. Thereby, lubricating oil is held in the recesses, and friction loss and wear are reduced.
しかし、潤滑油の低粘度化の進行により、特許文献１に記載されたようなディンプル状の凹部では、十分に潤滑油を保持することができず、油膜破断による焼付きが生じることがある。特に、ピストンなど上下方向に摺動する摺動面では、潤滑油の流出が生じやすくなるという問題がある。 However, due to the progress of lowering the viscosity of the lubricating oil, the dimple-shaped recess as described in Patent Document 1 cannot sufficiently hold the lubricating oil, and seizure may occur due to the oil film breakage. In particular, a sliding surface that slides in the vertical direction, such as a piston, has a problem that lubricating oil tends to flow out.
本発明は、上記課題に鑑みて、潤滑油の引き込み性および保持性が高く、油膜切れの生じにくい摺動部材およびエンジン部品を提供する。 In view of the above-described problems, the present invention provides a sliding member and an engine component that have a high oil retraction property and a high retention property and are less prone to oil film breakage.
本発明の摺動部材は、潤滑剤の介在下で相手部材と相対摺動を行う摺動部材において、
摺動面に潤滑剤溜まりとなる凹部が設けられ、前記凹部にグレーティング状の周期構造が形成されており、前記凹部は少なくとも周縁部において斜面又は曲面を有し、グレーティング状の周期構造の配向方向における凹部の周縁部の斜面又は曲面の斜度が４５°以下であるものである。ここで、斜度とは、凹部の周縁部が斜面である場合は、摺動面に対する斜面の傾斜角度であり、凹部の周縁部が曲面である場合は、摺動面に対する曲面（凹部の周縁部）の接線角度をいう。
The sliding member of the present invention is a sliding member that performs relative sliding with the mating member under the presence of a lubricant,
A concave portion serving as a lubricant reservoir is provided on the sliding surface, and a grating-like periodic structure is formed in the concave portion. The slope of the peripheral edge of the concave portion or the slope of the curved surface is 45 ° or less. Here, the slope is the inclination angle of the slope with respect to the sliding surface when the peripheral edge of the recess is a slope, and the curved surface (periphery of the recess) when the peripheral edge of the recess is a curved surface. Part).
本発明の摺動部材によれば、少なくとも周縁部において斜面又は曲面を有する凹部を備え、前記凹部にグレーティング状の周期構造が形成されており、グレーティング状の周期構造の配向方向における凹部の周縁部の斜度を４５°以下とすることで、表面積増加による濡れ性向上、毛管現象の効果が加わり、斜面又は曲面を介して凹部への潤滑油の引き込み性が向上するとともに、凹部からの潤滑油の供給性も向上することで、摺動部材の油膜切れを防止することができる。 According to the sliding member of the present invention, the concave portion having a slope or a curved surface is provided at least in the peripheral portion, and a grating-like periodic structure is formed in the concave portion, and the peripheral portion of the concave portion in the orientation direction of the grating-like periodic structure By making the inclination of 45 ° or less, the wettability is improved by increasing the surface area, the effect of capillary action is added, the pullability of the lubricating oil into the recess through the slope or curved surface is improved, and the lubricant from the recess As a result, the oil film of the sliding member can be prevented from being cut.
前記凹部に形成されたグレーティング状の周期構造は、周期ピッチと深さが異なる周期構造が重畳して形成されていてもよい。これにより、表面積増加による濡れ性向上、毛管現象の効果が増強され、潤滑油の引き込み性、保持性を向上することができる。 The grating-like periodic structure formed in the recess may be formed by overlapping periodic structures having different periodic pitches and depths. Thereby, the wettability improvement by the surface area increase and the effect of capillary action are strengthened, and the drawing-in property and retention property of lubricating oil can be improved.
前記構成において、前記グレーティング状の周期構造は、凸部頂点が非平坦面となって連続的に高さが変化するものであってもよい。これにより、開口部が広くなり、斜面又は曲面を介して潤滑油をスムーズに凹部に引き込むことができる。 In the above-described configuration, the grating-like periodic structure may be a structure in which the height of the convex portion apex becomes a non-flat surface and the height continuously changes. Thereby, an opening part becomes wide and lubricating oil can be smoothly drawn in into a recessed part via a slope or a curved surface.
前記グレーティング状の周期構造の周期ピッチが、１０μｍ以下であってもよい。これにより、毛管現象の効果が顕著となり、潤滑油の引き込み性が向上する。 The periodic pitch of the grating-like periodic structure may be 10 μm or less. Thereby, the effect of capillary action becomes remarkable and the drawing-in property of lubricating oil improves.
少なくとも一部の前記グレーティング状の周期構造の配向方向と摺動方向のなす角度が４５°以下とするのが好ましい。これにより、凹部から摺動面に速やかに潤滑油が供給され、摺動部材の油膜切れを防止することができる。 It is preferable that the angle formed by the orientation direction of at least a part of the grating-like periodic structure and the sliding direction is 45 ° or less. As a result, the lubricating oil is quickly supplied from the recess to the sliding surface, and the oil film of the sliding member can be prevented from being cut.
本発明の摺動部材を備えたエンジン部品は、低粘度の潤滑油使用時においても、潤滑油の流出が生じにくいため、焼付きの発生を防止できる。 The engine component provided with the sliding member of the present invention can prevent the seizure from occurring because the lubricating oil hardly flows out even when the low viscosity lubricating oil is used.
本発明の摺動部材およびエンジン部品は、潤滑油の引き込み性および保持性が高く、油膜切れの生じにくいものとなる。 The sliding member and the engine part of the present invention have high lubricating oil drawability and retention and are less likely to cause oil film breakage.
以下本発明の実施の形態を図１〜図１０に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to FIGS.
本発明に係る摺動部材は、図示省略の相手部材と潤滑下で相対的に摺動するものであり、例えばエンジン部品に適用することができる。摺動部材および相手部材は、炭素鋼、銅、アルミニウム、白金、超硬合金等であっても、炭化ケイ素や窒化ケイ素等のシリコン系セラミックスであっても、エンジニアプラスチック等であってもよい。また、潤滑剤としても、水やアルコールであっても、さらにはエンジンオイル等の潤滑油等であってもよい。すなわち、摺動部材や相手部材の材質は、使用する環境等に応じて種々の潤滑剤を用いることができる。 The sliding member according to the present invention slides relative to a counterpart member (not shown) under lubrication, and can be applied to, for example, engine parts. The sliding member and the counterpart member may be carbon steel, copper, aluminum, platinum, cemented carbide, silicon-based ceramics such as silicon carbide or silicon nitride, or engineer plastic. Also, the lubricant may be water or alcohol, or may be a lubricating oil such as engine oil. That is, various lubricants can be used as the material of the sliding member and the mating member depending on the environment used.
図１に示すように、本実施形態では摺動部材を例えば平板体とし、表面（本実施形態では上面）が、相手部材と接触する摺動面１となる。摺動面１には、潤滑剤溜まりとなる凹部２が離散的に複数設けられている。この凹部２は、図２に示すように、少なくとも周縁部３（つまり、摺動面１と凹部２との境界となる部分）において斜面４（図２（ａ）（ｃ）参照）又は曲面５（図２（ｂ）（ｄ）参照）を有する。斜面４とは、摺動面１（本実施形態では水平方向）に対して傾斜した面をいう。凹部２の周縁部３における斜面４又は曲面５の斜度θは４５°以下としている。斜度θとは、図２（ａ）のように摺動面１が平面であって凹部２の周縁部３が斜面４である場合は、摺動面１に対する斜面４の傾斜角度θ１であり、図２（ｂ）のように摺動面１が平面であって凹部２の周縁部３が曲面５である場合は、摺動面１に対する曲面５（凹部２の周縁部３）の接線角度θ２をいう。図２（ｃ）のように、摺動面１が曲面であって凹部２の周縁部３が斜面４である場合は、周縁部３における摺動面１の接線方向を基準とした斜面４の傾斜角度θ１であり、図２（ｄ）のように摺動面１が曲面であって凹部２の周縁部３が曲面５である場合は、周縁部３における摺動面１の接線方向を基準とした曲面５（凹部２の周縁部３）の接線角度θ２をいう。なお、周縁部３において斜面４又は曲面５を有していれば、凹部２の底部は、図２（ａ）のような曲面や、図２（ｂ）のような平面等、どのような形状であってもよい。 As shown in FIG. 1, in this embodiment, a sliding member is made into a flat plate body, for example, and the surface (upper surface in this embodiment) becomes the sliding surface 1 which contacts a mating member. The sliding surface 1 is provided with a plurality of discrete recesses 2 serving as lubricant reservoirs. As shown in FIG. 2, the concave portion 2 has an inclined surface 4 (see FIGS. 2A and 2C) or a curved surface 5 at least at the peripheral edge portion 3 (that is, the portion that becomes the boundary between the sliding surface 1 and the concave portion 2). (See FIGS. 2B and 2D). The inclined surface 4 refers to a surface inclined with respect to the sliding surface 1 (horizontal direction in the present embodiment). The slope θ of the slope 4 or the curved surface 5 at the peripheral edge 3 of the recess 2 is 45 ° or less. The inclination θ is the inclination angle θ1 of the inclined surface 4 with respect to the sliding surface 1 when the sliding surface 1 is a flat surface and the peripheral edge 3 of the recess 2 is an inclined surface 4 as shown in FIG. 2B, when the sliding surface 1 is a flat surface and the peripheral edge 3 of the recess 2 is a curved surface 5, the tangential angle of the curved surface 5 (the peripheral edge 3 of the recess 2) with respect to the sliding surface 1. It refers to θ2. As shown in FIG. 2C, when the sliding surface 1 is a curved surface and the peripheral edge 3 of the recess 2 is a slope 4, the slope 4 with respect to the tangential direction of the sliding face 1 at the peripheral edge 3 is used. When the sliding surface 1 is a curved surface and the peripheral edge 3 of the recess 2 is a curved surface 5 as shown in FIG. 2D, the tangential direction of the sliding surface 1 at the peripheral edge 3 is a reference. The tangent angle θ2 of the curved surface 5 (the peripheral edge 3 of the recess 2). If the peripheral edge 3 has the inclined surface 4 or the curved surface 5, the bottom of the recess 2 has any shape such as a curved surface as shown in FIG. 2A or a flat surface as shown in FIG. It may be.
凹部２には、図３に示すようなグレーティング状の周期構造６が形成されている。または，図９に示すような周期ピッチと深さが異なる周期構造が重畳して形成された重畳周期構造６Ａが形成されていてもよい。重畳周期構造６Ａは、図９に示すように、第１の周期構造（粗い周期構造）７と、第１の周期構造７よりも周期ピッチと深さが小さい第２の周期構造（細かい周期構造）８とを有している。第１の周期構造７は、微小の凹部９と微小の凸部１０とが交互に所定ピッチで配設されてなるものである。第２の周期構造８は、第１の周期構造７の配向方向と略直交し、凹部９および凸部１０よりもさらに微小な凹部１１と凸部１２とが交互に所定ピッチで配設されてなるものである。凸部１０、１２の頂点は、非平坦面となって連続的に高さが変化している。また、周期構造６、周期構造７および周期構造８の凹凸ピッチは１０μｍ以下とするのが好ましい。なお，いずれの周期構造も多少の乱れがあっても問題はない。 In the recess 2, a grating-like periodic structure 6 as shown in FIG. 3 is formed. Alternatively, an overlapping periodic structure 6A formed by overlapping periodic structures having different periodic pitches and depths as shown in FIG. 9 may be formed. As shown in FIG. 9, the superimposed periodic structure 6 </ b> A includes a first periodic structure (coarse periodic structure) 7 and a second periodic structure (fine periodic structure) having a periodic pitch and depth smaller than those of the first periodic structure 7. ) 8. The first periodic structure 7 is formed by alternately arranging minute concave portions 9 and minute convex portions 10 at a predetermined pitch. The second periodic structure 8 is substantially orthogonal to the orientation direction of the first periodic structure 7, and the concave portions 11 and the convex portions 12 that are smaller than the concave portions 9 and the convex portions 10 are alternately arranged at a predetermined pitch. It will be. The vertices of the convex portions 10 and 12 are non-flat surfaces and the height continuously changes. Moreover, it is preferable that the uneven | corrugated pitch of the periodic structure 6, the periodic structure 7, and the periodic structure 8 shall be 10 micrometers or less. It should be noted that there is no problem if any periodic structure is somewhat disturbed.
本実施形態では、グレーティング状の周期構造６または第１の周期構造７か第２の周期構造８のいずれかの配向方向と摺動方向のなす角度を４５°以下としている。すなわち、図３の場合，周期構造６の配向方向から±４５°以内となる範囲α内のいずれかの方向を摺動方向とする。図９の場合，全ての摺動方向で第１の周期構造７か第２の周期構造８の配向方向が±４５°以内となるため，摺動方向は不問となる。 In the present embodiment, the angle formed by the orientation direction of either the grating-like periodic structure 6 or the first periodic structure 7 or the second periodic structure 8 and the sliding direction is set to 45 ° or less. That is, in the case of FIG. 3, any direction within a range α within ± 45 ° from the orientation direction of the periodic structure 6 is defined as the sliding direction. In the case of FIG. 9, since the orientation direction of the first periodic structure 7 or the second periodic structure 8 is within ± 45 ° in all sliding directions, the sliding direction is not limited.
このように、少なくとも周縁部３において斜面４又は曲面５を有する凹部２を備え、凹部２にグレーティング状の周期構造６または重畳周期構造６Ａが形成されており、いずれかの周期構造の配向方向における凹部２の周縁部３の斜度を４５°以下とすることで、表面積増加による濡れ性向上、毛管現象の効果が加わり、斜面４又は曲面５を介して凹部２への潤滑油の引き込み性が向上するとともに、凹部２からの潤滑油の供給性も向上することで、摺動部材の油膜切れを防止することができる。 As described above, the concave portion 2 having the inclined surface 4 or the curved surface 5 is provided at least at the peripheral edge portion 3, and the grating-like periodic structure 6 or the overlapping periodic structure 6 </ b> A is formed in the concave portion 2. By making the inclination of the peripheral edge 3 of the recess 2 45 ° or less, the wettability is improved by increasing the surface area, and the effect of capillary action is added, so that the lubricating oil can be drawn into the recess 2 via the slope 4 or the curved surface 5. While improving, the supply property of the lubricating oil from the recessed part 2 is also improved, so that the oil film of the sliding member can be prevented.
また、凹部２に形成された重畳周期構造６Ａは、周期ピッチと深さが異なる周期構造７、８が重畳して形成されていることで、表面積増加による濡れ性向上、毛管現象の効果が増強され、潤滑油の引き込み性、保持性を向上することができる。 In addition, the overlapping periodic structure 6A formed in the concave portion 2 is formed by overlapping the periodic structures 7 and 8 having different periodic pitches and depths, thereby improving wettability by increasing the surface area and enhancing the effect of capillary action. As a result, it is possible to improve the drawability and retention of the lubricating oil.
グレーティング状の周期構造６または重畳周期構造６Ａは、凸部頂点が非平坦面となって連続的に高さが変化するものとしているため、開口部が広くなり、斜面４又は曲面５を介して潤滑油をスムーズに凹部２に引き込むことができる。また、グレーティング状の周期構造６または重畳周期構造６Ａの周期ピッチを、１０μｍ以下としているため、毛管現象の効果が顕著となり、潤滑油の引き込み性が向上する。 Since the grating-like periodic structure 6 or the overlapping periodic structure 6A has a convex top that is a non-flat surface and continuously changes in height, the opening is widened via the slope 4 or the curved surface 5. Lubricating oil can be smoothly drawn into the recess 2. Further, since the periodic pitch of the grating-like periodic structure 6 or the overlapping periodic structure 6A is set to 10 μm or less, the effect of capillary action becomes remarkable, and the pulling property of the lubricating oil is improved.
少なくとも一部の前記グレーティング状の周期構造６または重畳周期構造６Ａの配向方向と摺動方向のなす角度を４５°以下としているため、凹部２から摺動面１に速やかに潤滑油が供給され、摺動部材の油膜切れを防止することができる。 Since the angle between the orientation direction of at least a part of the grating-like periodic structure 6 or the overlapping periodic structure 6A and the sliding direction is 45 ° or less, the lubricating oil is quickly supplied from the recess 2 to the sliding surface 1; Oil film breakage of the sliding member can be prevented.
本発明は前記実施形態に限定されることなく種々の変形が可能であって、例えば、摺動部材の摺動面１としては、平面ではなく円筒面（筒体の内径面や外径面、中実体の外径面）等であってもよい。また、摺動部材と相手部材との摺動は、面接触、線接触、および点接触のいずれであってもよい。摺動部材の摺動方法としては、摺動部材側を固定して相手部材を摺動部材１に対して摺動させても、逆に、相手部材側を固定して摺動部材を相手部材に対して摺動させても、摺動部材と相手部材とを摺動させてもよい。また，第１の周期構造７と第２の周期構造８の配向方向が略直交でなくてもよい。 The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the sliding surface 1 of the sliding member is not a flat surface but a cylindrical surface (an inner diameter surface or an outer diameter surface of a cylindrical body, It may be a solid outer surface). The sliding between the sliding member and the mating member may be any of surface contact, line contact, and point contact. As a sliding method of the sliding member, even if the sliding member side is fixed and the mating member is slid with respect to the sliding member 1, conversely, the mating member side is fixed and the mating member is fixed. The sliding member and the mating member may be slid. Further, the orientation directions of the first periodic structure 7 and the second periodic structure 8 may not be substantially orthogonal.
凹部２の開口部の大きさ、底部までの深さ、断面形状、平面形状、数、位置は種々のものとすることができ、潤滑の必要性に応じて適宜決定することができる。 The size of the opening of the recess 2, the depth to the bottom, the cross-sectional shape, the planar shape, the number, and the position can be various, and can be appropriately determined according to the necessity of lubrication.
周期構造形成には、フェムト秒レーザ、ピコ秒レーザ、およびナノ秒レーザといったパルスレーザを使用することができる。 Pulsed lasers such as femtosecond lasers, picosecond lasers, and nanosecond lasers can be used for forming the periodic structure.
図４に周期構造を形成したプレート試験片を示す。ＳＵＳ３０４基板に超短パルスレーザを加工しきい値近傍のエネルギー密度で照射し、図４（ａ）に示すようなグレーティング状の周期構造（ピッチ約９００ｎｍ、深さ約２５０ｎｍ）を帯状領域（幅３ｍｍ、長さ１５ｍｍ）に形成した。周期構造の配向方向は帯状領域に対して直交（直交プレート、図４（ｂ）参照）、および平行（平行プレート、図４（ｃ）参照）とした。 FIG. 4 shows a plate test piece having a periodic structure. An SUS304 substrate is irradiated with an ultrashort pulse laser at an energy density near the processing threshold, and a grating-like periodic structure (pitch: about 900 nm, depth: about 250 nm) as shown in FIG. And a length of 15 mm). The orientation direction of the periodic structure was perpendicular to the belt-like region (orthogonal plate, see FIG. 4B) and parallel (parallel plate, see FIG. 4C).
周期構造の潤滑油に対する引き込み性を評価するため、ディップ試験装置を用いて、周期構造を形成した帯状領域端部を潤滑油に浸漬し、潤滑油の持ち上げ高さを測定した。潤滑油にはＰＡＯ２[６．５ｃＰ（２５℃）]を使用した。 In order to evaluate the pullability of the periodic structure with respect to the lubricating oil, the end of the belt-shaped region where the periodic structure was formed was immersed in the lubricating oil using a dip test apparatus, and the lifting height of the lubricating oil was measured. PAO2 [6.5 cP (25 ° C.)] was used as the lubricating oil.
図５に直交プレート、図６に平行プレートを潤滑油に浸漬した際の、潤滑油持ち上げの様子を示す。また、潤滑油持ち上げ高さの推移を図７に示す。直交プレート、平行プレートともに潤滑油を持ち上げることが可能であった。図５及び図６における三角印が潤滑油の持ち上げ高さを示しており、図５、図６、及び図７に示すように、平行プレートの潤滑油持ち上げ高さは、直交プレートの２倍となった。図示省略するが、未加工部では潤滑油の持ち上げは認められなかった。 FIG. 5 shows a state of lifting the lubricating oil when the orthogonal plate is immersed in the lubricating oil and FIG. 6 shows the parallel plate. Moreover, the transition of the lifting height of the lubricating oil is shown in FIG. It was possible to lift the lubricant on both the orthogonal plate and the parallel plate. The triangular mark in FIGS. 5 and 6 indicates the lifting height of the lubricating oil. As shown in FIGS. 5, 6, and 7, the lubricating oil lifting height of the parallel plate is twice that of the orthogonal plate. became. Although not shown in the drawings, the lubricating oil was not lifted in the unprocessed portion.
原子間力顕微鏡の測定結果から、周期構造の表面積は未加工部に対して１．７８倍であった。表面積倍率ｒである粗面の見かけの接触角θWと平滑面の接触角θeの関係は、凹部まで液体が入り込むＷｅｎｚｅｌモデルの場合、ｃｏｓθW＝ｒｃｏｓθeで表される。見かけの接触角θWが０°となれば、拡張濡れに移行する。すなわち、前記数式において、θW＝０°およびｒ＝１．７８である場合、θeは５６°であり、平滑面の接触角θeが５６°以下の液体は、拡張濡れに移行する。本実施例において使用したＰＡＯ２の接触角は１０°以下であるため、直交プレート、平行プレートともに潤滑油を持ち上げることとなった。平行プレートは、周期構造の配向方向と潤滑油の持ち上げ方向が合致するため、毛管現象の効果が加わり、潤滑油の引き込み性が向上したと考えられる。 From the measurement results of the atomic force microscope, the surface area of the periodic structure was 1.78 times that of the unprocessed portion. The relationship between the apparent contact angle θ W of the rough surface, which is the surface area magnification r, and the contact angle θ e of the smooth surface is expressed by cos θ W = r cos θ e in the case of the Wenzel model in which the liquid enters the recess. When the apparent contact angle θ W becomes 0 °, the process moves to extended wetting. That is, in the above formula, when θ W = 0 ° and r = 1.78, θ e is 56 °, and a liquid having a smooth surface contact angle θ e of 56 ° or less shifts to expansion wetting. Since the contact angle of PAO2 used in this example is 10 ° or less, the lubricating oil is lifted for both the orthogonal plate and the parallel plate. In the parallel plate, the orientation direction of the periodic structure and the lifting direction of the lubricating oil coincide with each other. Therefore, it is considered that the effect of capillary action is added and the pulling property of the lubricating oil is improved.
また、水平配置したプレート試験片の帯状領域端部に１μｌのＰＡＯ２を点着し、油滴の濡れ広がりの様子を観察した。帯状領域は周縁部に斜面を有する凹状とし、斜面の傾斜角は約３３°とした。 In addition, 1 μl of PAO 2 was spotted on the end of the strip-like region of the horizontally placed plate test piece, and the state of wetting and spreading of the oil droplets was observed. The belt-like region was a concave shape having a slope at the peripheral edge, and the slope angle of the slope was about 33 °.
図８に、油滴の濡れ広がりの様子を示す。周期構造と未加工部にまたがって点着した潤滑油は周期構造側に引き込まれて帯状領域全体に濡れ広がった。潤滑油は帯状領域に保持され、安定した。斜面を有する凹部に周期構造を形成することで、未加工部から潤滑油をスムーズに引き込み、保持することが可能となる。 FIG. 8 shows how the oil droplets wet and spread. The lubricating oil spotted across the periodic structure and the unprocessed part was drawn to the periodic structure side and spread throughout the belt-like region. The lubricating oil was retained in the belt-like region and stabilized. By forming the periodic structure in the concave portion having the inclined surface, it becomes possible to smoothly draw in and hold the lubricating oil from the unprocessed portion.
さらに、潤滑油の引き込み性、保持性を向上するため、周縁部に前記斜面を有する矩形ディンプル状凹部（縦横３ｍｍ、深さ１０μｍ）に、図９に示すような粗い周期構造７（ピッチ約３５００ｎｍ、深さ約６００ｎｍ）と細かい周期構造8（ピッチ約９００ｎｍ、深さ約２５０ｎｍ）を重畳して形成し、潤滑油を０．２μｌ保持させた様子を図１０に示す。潤滑油がディンプル内でのみ濡れ広がり、保持された。 Furthermore, in order to improve the drawability and retention of the lubricating oil, a rough periodic structure 7 (pitch of about 3500 nm as shown in FIG. 9) is formed in a rectangular dimple-like concave portion (longitudinal and transverse 3 mm, depth 10 μm) having the inclined surface at the periphery. FIG. 10 shows a state in which a fine periodic structure 8 (pitch of about 900 nm, depth of about 250 nm) is formed to overlap and 0.2 μl of lubricating oil is held. The lubricant spread and retained only in the dimples.
以上より、周期構造により直交プレート、平行プレートともに潤滑油を上方に引き込むことが可能であることがわかった。特に、平行プレートは毛管現象の効果が加わり、潤滑油の引き込み性が向上することがわかった。また、斜面を有する凹部に形成した周期構造と未加工部にまたがって点着した潤滑油は周期構造側に引き込まれ、周期構造に保持されることがわかった。さらには、凹部に周期ピッチと深さが異なるグレーティング状の周期構造が重畳して形成したディンプルでは、潤滑油がディンプル内でのみ濡れ広がり、保持されることがわかった。 From the above, it was found that the lubricating oil can be drawn upward in both the orthogonal plate and the parallel plate by the periodic structure. In particular, it has been found that the parallel plate has an effect of capillary action and improves the pulling property of the lubricating oil. Further, it was found that the lubricating oil spotted across the periodic structure formed in the concave portion having the slope and the unprocessed portion is drawn into the periodic structure side and held in the periodic structure. Furthermore, it was found that in the dimples formed by superimposing grating-like periodic structures having different periodic pitches and depths on the recesses, the lubricating oil spreads and is retained only in the dimples.
１ 摺動面
２ 凹部
３ 周縁部
４ 斜面
５ 曲面
６ 周期構造
DESCRIPTION OF SYMBOLS 1 Sliding surface 2 Concave part 3 Perimeter part 4 Slope 5 Curved surface 6 Periodic structure
Claims (6)
摺動面に潤滑剤溜まりとなる凹部が設けられ、前記凹部にグレーティング状の周期構造が形成されており、前記凹部は少なくとも周縁部において斜面又は曲面を有し、グレーティング状の周期構造の配向方向における凹部の周縁部の斜面又は曲面の斜度が４５°以下であることを特徴とする摺動部材。 In a sliding member that slides relative to the mating member under the presence of a lubricant,
A concave portion serving as a lubricant reservoir is provided on the sliding surface, and a grating-like periodic structure is formed in the concave portion. A sliding member characterized in that the slope of the peripheral portion of the concave portion or the slope of the curved surface is 45 ° or less.
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